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Commit | Line | Data |
---|---|---|
953406b4 | 1 | aufs2 kbuild patch for linux-2.6. |
b752ccd1 AM |
2 | |
3 | diff --git a/fs/Kconfig b/fs/Kconfig | |
953406b4 | 4 | index 3d18530..8f582e1 100644 |
b752ccd1 AM |
5 | --- a/fs/Kconfig |
6 | +++ b/fs/Kconfig | |
7 | @@ -189,6 +189,7 @@ source "fs/romfs/Kconfig" | |
8 | source "fs/sysv/Kconfig" | |
9 | source "fs/ufs/Kconfig" | |
10 | source "fs/exofs/Kconfig" | |
11 | +source "fs/aufs/Kconfig" | |
12 | ||
13 | endif # MISC_FILESYSTEMS | |
14 | ||
15 | diff --git a/fs/Makefile b/fs/Makefile | |
16 | index e6ec1d3..b0d795a 100644 | |
17 | --- a/fs/Makefile | |
18 | +++ b/fs/Makefile | |
19 | @@ -126,3 +126,4 @@ obj-$(CONFIG_BTRFS_FS) += btrfs/ | |
20 | obj-$(CONFIG_GFS2_FS) += gfs2/ | |
21 | obj-$(CONFIG_EXOFS_FS) += exofs/ | |
22 | obj-$(CONFIG_CEPH_FS) += ceph/ | |
23 | +obj-$(CONFIG_AUFS_FS) += aufs/ | |
24 | diff --git a/include/linux/Kbuild b/include/linux/Kbuild | |
953406b4 | 25 | index 626b629..a841231 100644 |
b752ccd1 AM |
26 | --- a/include/linux/Kbuild |
27 | +++ b/include/linux/Kbuild | |
953406b4 | 28 | @@ -60,6 +60,7 @@ header-y += atmppp.h |
b752ccd1 AM |
29 | header-y += atmsap.h |
30 | header-y += atmsvc.h | |
953406b4 | 31 | header-y += audit.h |
b752ccd1 | 32 | +header-y += aufs_type.h |
953406b4 | 33 | header-y += auto_fs.h |
b752ccd1 | 34 | header-y += auto_fs4.h |
953406b4 AM |
35 | header-y += auxvec.h |
36 | aufs2 base patch for linux-2.6. | |
b752ccd1 AM |
37 | |
38 | diff --git a/fs/namei.c b/fs/namei.c | |
953406b4 | 39 | index 17ea76b..56e8ece 100644 |
b752ccd1 AM |
40 | --- a/fs/namei.c |
41 | +++ b/fs/namei.c | |
953406b4 | 42 | @@ -1168,7 +1168,7 @@ out: |
b752ccd1 AM |
43 | * needs parent already locked. Doesn't follow mounts. |
44 | * SMP-safe. | |
45 | */ | |
46 | -static struct dentry *lookup_hash(struct nameidata *nd) | |
47 | +struct dentry *lookup_hash(struct nameidata *nd) | |
48 | { | |
49 | int err; | |
50 | ||
953406b4 | 51 | @@ -1178,7 +1178,7 @@ static struct dentry *lookup_hash(struct nameidata *nd) |
b752ccd1 AM |
52 | return __lookup_hash(&nd->last, nd->path.dentry, nd); |
53 | } | |
54 | ||
55 | -static int __lookup_one_len(const char *name, struct qstr *this, | |
56 | +int __lookup_one_len(const char *name, struct qstr *this, | |
57 | struct dentry *base, int len) | |
58 | { | |
59 | unsigned long hash; | |
60 | diff --git a/fs/splice.c b/fs/splice.c | |
953406b4 | 61 | index 8f1dfae..278c94f 100644 |
b752ccd1 AM |
62 | --- a/fs/splice.c |
63 | +++ b/fs/splice.c | |
953406b4 | 64 | @@ -1092,8 +1092,8 @@ EXPORT_SYMBOL(generic_splice_sendpage); |
b752ccd1 AM |
65 | /* |
66 | * Attempt to initiate a splice from pipe to file. | |
67 | */ | |
68 | -static long do_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
69 | - loff_t *ppos, size_t len, unsigned int flags) | |
70 | +long do_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
71 | + loff_t *ppos, size_t len, unsigned int flags) | |
72 | { | |
73 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, | |
74 | loff_t *, size_t, unsigned int); | |
953406b4 | 75 | @@ -1120,9 +1120,9 @@ static long do_splice_from(struct pipe_inode_info *pipe, struct file *out, |
b752ccd1 AM |
76 | /* |
77 | * Attempt to initiate a splice from a file to a pipe. | |
78 | */ | |
79 | -static long do_splice_to(struct file *in, loff_t *ppos, | |
80 | - struct pipe_inode_info *pipe, size_t len, | |
81 | - unsigned int flags) | |
82 | +long do_splice_to(struct file *in, loff_t *ppos, | |
83 | + struct pipe_inode_info *pipe, size_t len, | |
84 | + unsigned int flags) | |
85 | { | |
86 | ssize_t (*splice_read)(struct file *, loff_t *, | |
87 | struct pipe_inode_info *, size_t, unsigned int); | |
88 | diff --git a/include/linux/namei.h b/include/linux/namei.h | |
89 | index 05b441d..91bc74e 100644 | |
90 | --- a/include/linux/namei.h | |
91 | +++ b/include/linux/namei.h | |
92 | @@ -73,6 +73,9 @@ extern int vfs_path_lookup(struct dentry *, struct vfsmount *, | |
93 | extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry, | |
94 | int (*open)(struct inode *, struct file *)); | |
95 | ||
96 | +extern struct dentry *lookup_hash(struct nameidata *nd); | |
97 | +extern int __lookup_one_len(const char *name, struct qstr *this, | |
98 | + struct dentry *base, int len); | |
99 | extern struct dentry *lookup_one_len(const char *, struct dentry *, int); | |
100 | ||
101 | extern int follow_down(struct path *); | |
102 | diff --git a/include/linux/splice.h b/include/linux/splice.h | |
103 | index 997c3b4..be9a153 100644 | |
104 | --- a/include/linux/splice.h | |
105 | +++ b/include/linux/splice.h | |
106 | @@ -89,4 +89,10 @@ extern int splice_grow_spd(struct pipe_inode_info *, struct splice_pipe_desc *); | |
107 | extern void splice_shrink_spd(struct pipe_inode_info *, | |
108 | struct splice_pipe_desc *); | |
109 | ||
110 | +extern long do_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
111 | + loff_t *ppos, size_t len, unsigned int flags); | |
112 | +extern long do_splice_to(struct file *in, loff_t *ppos, | |
113 | + struct pipe_inode_info *pipe, size_t len, | |
114 | + unsigned int flags); | |
115 | + | |
116 | #endif | |
953406b4 | 117 | aufs2 standalone patch for linux-2.6. |
b752ccd1 AM |
118 | |
119 | diff --git a/fs/namei.c b/fs/namei.c | |
953406b4 | 120 | index 56e8ece..ba75f28 100644 |
b752ccd1 AM |
121 | --- a/fs/namei.c |
122 | +++ b/fs/namei.c | |
953406b4 | 123 | @@ -347,6 +347,7 @@ int deny_write_access(struct file * file) |
b752ccd1 AM |
124 | |
125 | return 0; | |
126 | } | |
127 | +EXPORT_SYMBOL(deny_write_access); | |
128 | ||
129 | /** | |
130 | * path_get - get a reference to a path | |
953406b4 | 131 | @@ -1177,6 +1178,7 @@ struct dentry *lookup_hash(struct nameidata *nd) |
b752ccd1 AM |
132 | return ERR_PTR(err); |
133 | return __lookup_hash(&nd->last, nd->path.dentry, nd); | |
134 | } | |
135 | +EXPORT_SYMBOL(lookup_hash); | |
136 | ||
137 | int __lookup_one_len(const char *name, struct qstr *this, | |
138 | struct dentry *base, int len) | |
953406b4 | 139 | @@ -1199,6 +1201,7 @@ int __lookup_one_len(const char *name, struct qstr *this, |
b752ccd1 AM |
140 | this->hash = end_name_hash(hash); |
141 | return 0; | |
142 | } | |
143 | +EXPORT_SYMBOL(__lookup_one_len); | |
144 | ||
145 | /** | |
146 | * lookup_one_len - filesystem helper to lookup single pathname component | |
147 | diff --git a/fs/namespace.c b/fs/namespace.c | |
953406b4 | 148 | index 2e10cb1..8fa77c4 100644 |
b752ccd1 AM |
149 | --- a/fs/namespace.c |
150 | +++ b/fs/namespace.c | |
953406b4 | 151 | @@ -1283,6 +1283,7 @@ int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg, |
b752ccd1 AM |
152 | } |
153 | return 0; | |
154 | } | |
155 | +EXPORT_SYMBOL(iterate_mounts); | |
156 | ||
157 | static void cleanup_group_ids(struct vfsmount *mnt, struct vfsmount *end) | |
158 | { | |
159 | diff --git a/fs/notify/group.c b/fs/notify/group.c | |
953406b4 | 160 | index d309f38..f0e9568 100644 |
b752ccd1 AM |
161 | --- a/fs/notify/group.c |
162 | +++ b/fs/notify/group.c | |
163 | @@ -22,6 +22,7 @@ | |
164 | #include <linux/srcu.h> | |
165 | #include <linux/rculist.h> | |
166 | #include <linux/wait.h> | |
167 | +#include <linux/module.h> | |
168 | ||
169 | #include <linux/fsnotify_backend.h> | |
170 | #include "fsnotify.h" | |
953406b4 AM |
171 | @@ -70,6 +71,7 @@ void fsnotify_put_group(struct fsnotify_group *group) |
172 | if (atomic_dec_and_test(&group->refcnt)) | |
173 | fsnotify_destroy_group(group); | |
b752ccd1 AM |
174 | } |
175 | +EXPORT_SYMBOL(fsnotify_put_group); | |
176 | ||
177 | /* | |
953406b4 AM |
178 | * Create a new fsnotify_group and hold a reference for the group returned. |
179 | @@ -102,3 +104,4 @@ struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops) | |
b752ccd1 AM |
180 | |
181 | return group; | |
182 | } | |
953406b4 AM |
183 | +EXPORT_SYMBOL(fsnotify_alloc_group); |
184 | diff --git a/fs/notify/mark.c b/fs/notify/mark.c | |
185 | index 325185e..adede09 100644 | |
186 | --- a/fs/notify/mark.c | |
187 | +++ b/fs/notify/mark.c | |
188 | @@ -113,6 +113,7 @@ void fsnotify_put_mark(struct fsnotify_mark *mark) | |
189 | if (atomic_dec_and_test(&mark->refcnt)) | |
190 | mark->free_mark(mark); | |
b752ccd1 AM |
191 | } |
192 | +EXPORT_SYMBOL(fsnotify_put_mark); | |
193 | ||
194 | /* | |
953406b4 AM |
195 | * Any time a mark is getting freed we end up here. |
196 | @@ -190,6 +191,7 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark) | |
b752ccd1 AM |
197 | if (unlikely(atomic_dec_and_test(&group->num_marks))) |
198 | fsnotify_final_destroy_group(group); | |
199 | } | |
953406b4 | 200 | +EXPORT_SYMBOL(fsnotify_destroy_mark); |
b752ccd1 | 201 | |
953406b4 AM |
202 | void fsnotify_set_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask) |
203 | { | |
204 | @@ -277,6 +279,7 @@ err: | |
b752ccd1 | 205 | |
953406b4 | 206 | return ret; |
b752ccd1 | 207 | } |
953406b4 | 208 | +EXPORT_SYMBOL(fsnotify_add_mark); |
b752ccd1 AM |
209 | |
210 | /* | |
953406b4 AM |
211 | * clear any marks in a group in which mark->flags & flags is true |
212 | @@ -332,6 +335,7 @@ void fsnotify_init_mark(struct fsnotify_mark *mark, | |
213 | atomic_set(&mark->refcnt, 1); | |
214 | mark->free_mark = free_mark; | |
b752ccd1 | 215 | } |
953406b4 | 216 | +EXPORT_SYMBOL(fsnotify_init_mark); |
b752ccd1 | 217 | |
953406b4 AM |
218 | static int fsnotify_mark_destroy(void *ignored) |
219 | { | |
b752ccd1 | 220 | diff --git a/fs/open.c b/fs/open.c |
953406b4 | 221 | index 630715f..1c864c7 100644 |
b752ccd1 AM |
222 | --- a/fs/open.c |
223 | +++ b/fs/open.c | |
953406b4 | 224 | @@ -60,6 +60,7 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs, |
b752ccd1 AM |
225 | mutex_unlock(&dentry->d_inode->i_mutex); |
226 | return ret; | |
227 | } | |
228 | +EXPORT_SYMBOL(do_truncate); | |
229 | ||
230 | static long do_sys_truncate(const char __user *pathname, loff_t length) | |
231 | { | |
232 | diff --git a/fs/splice.c b/fs/splice.c | |
953406b4 | 233 | index 278c94f..033f7ac 100644 |
b752ccd1 AM |
234 | --- a/fs/splice.c |
235 | +++ b/fs/splice.c | |
953406b4 | 236 | @@ -1116,6 +1116,7 @@ long do_splice_from(struct pipe_inode_info *pipe, struct file *out, |
b752ccd1 AM |
237 | |
238 | return splice_write(pipe, out, ppos, len, flags); | |
239 | } | |
240 | +EXPORT_SYMBOL(do_splice_from); | |
241 | ||
242 | /* | |
243 | * Attempt to initiate a splice from a file to a pipe. | |
953406b4 | 244 | @@ -1142,6 +1143,7 @@ long do_splice_to(struct file *in, loff_t *ppos, |
b752ccd1 AM |
245 | |
246 | return splice_read(in, ppos, pipe, len, flags); | |
247 | } | |
248 | +EXPORT_SYMBOL(do_splice_to); | |
249 | ||
250 | /** | |
251 | * splice_direct_to_actor - splices data directly between two non-pipes | |
252 | diff --git a/security/commoncap.c b/security/commoncap.c | |
253 | index 4e01599..3611e1b 100644 | |
254 | --- a/security/commoncap.c | |
255 | +++ b/security/commoncap.c | |
256 | @@ -951,3 +951,4 @@ int cap_file_mmap(struct file *file, unsigned long reqprot, | |
257 | } | |
258 | return ret; | |
259 | } | |
260 | +EXPORT_SYMBOL(cap_file_mmap); | |
261 | diff --git a/security/device_cgroup.c b/security/device_cgroup.c | |
262 | index 8d9c48f..29108aa 100644 | |
263 | --- a/security/device_cgroup.c | |
264 | +++ b/security/device_cgroup.c | |
265 | @@ -515,6 +515,7 @@ found: | |
266 | ||
267 | return -EPERM; | |
268 | } | |
269 | +EXPORT_SYMBOL(devcgroup_inode_permission); | |
270 | ||
271 | int devcgroup_inode_mknod(int mode, dev_t dev) | |
272 | { | |
273 | diff --git a/security/security.c b/security/security.c | |
953406b4 | 274 | index c53949f..0ae5b91 100644 |
b752ccd1 AM |
275 | --- a/security/security.c |
276 | +++ b/security/security.c | |
277 | @@ -376,6 +376,7 @@ int security_path_mkdir(struct path *dir, struct dentry *dentry, int mode) | |
278 | return 0; | |
279 | return security_ops->path_mkdir(dir, dentry, mode); | |
280 | } | |
281 | +EXPORT_SYMBOL(security_path_mkdir); | |
282 | ||
283 | int security_path_rmdir(struct path *dir, struct dentry *dentry) | |
284 | { | |
285 | @@ -383,6 +384,7 @@ int security_path_rmdir(struct path *dir, struct dentry *dentry) | |
286 | return 0; | |
287 | return security_ops->path_rmdir(dir, dentry); | |
288 | } | |
289 | +EXPORT_SYMBOL(security_path_rmdir); | |
290 | ||
291 | int security_path_unlink(struct path *dir, struct dentry *dentry) | |
292 | { | |
293 | @@ -390,6 +392,7 @@ int security_path_unlink(struct path *dir, struct dentry *dentry) | |
294 | return 0; | |
295 | return security_ops->path_unlink(dir, dentry); | |
296 | } | |
297 | +EXPORT_SYMBOL(security_path_unlink); | |
298 | ||
299 | int security_path_symlink(struct path *dir, struct dentry *dentry, | |
300 | const char *old_name) | |
301 | @@ -398,6 +401,7 @@ int security_path_symlink(struct path *dir, struct dentry *dentry, | |
302 | return 0; | |
303 | return security_ops->path_symlink(dir, dentry, old_name); | |
304 | } | |
305 | +EXPORT_SYMBOL(security_path_symlink); | |
306 | ||
307 | int security_path_link(struct dentry *old_dentry, struct path *new_dir, | |
308 | struct dentry *new_dentry) | |
309 | @@ -406,6 +410,7 @@ int security_path_link(struct dentry *old_dentry, struct path *new_dir, | |
310 | return 0; | |
311 | return security_ops->path_link(old_dentry, new_dir, new_dentry); | |
312 | } | |
313 | +EXPORT_SYMBOL(security_path_link); | |
314 | ||
315 | int security_path_rename(struct path *old_dir, struct dentry *old_dentry, | |
316 | struct path *new_dir, struct dentry *new_dentry) | |
317 | @@ -416,6 +421,7 @@ int security_path_rename(struct path *old_dir, struct dentry *old_dentry, | |
318 | return security_ops->path_rename(old_dir, old_dentry, new_dir, | |
319 | new_dentry); | |
320 | } | |
321 | +EXPORT_SYMBOL(security_path_rename); | |
322 | ||
953406b4 AM |
323 | int security_path_truncate(struct path *path) |
324 | { | |
325 | @@ -423,6 +429,7 @@ int security_path_truncate(struct path *path) | |
b752ccd1 | 326 | return 0; |
953406b4 | 327 | return security_ops->path_truncate(path); |
b752ccd1 AM |
328 | } |
329 | +EXPORT_SYMBOL(security_path_truncate); | |
330 | ||
331 | int security_path_chmod(struct dentry *dentry, struct vfsmount *mnt, | |
332 | mode_t mode) | |
953406b4 | 333 | @@ -431,6 +438,7 @@ int security_path_chmod(struct dentry *dentry, struct vfsmount *mnt, |
b752ccd1 AM |
334 | return 0; |
335 | return security_ops->path_chmod(dentry, mnt, mode); | |
336 | } | |
337 | +EXPORT_SYMBOL(security_path_chmod); | |
338 | ||
339 | int security_path_chown(struct path *path, uid_t uid, gid_t gid) | |
340 | { | |
953406b4 | 341 | @@ -438,6 +446,7 @@ int security_path_chown(struct path *path, uid_t uid, gid_t gid) |
b752ccd1 AM |
342 | return 0; |
343 | return security_ops->path_chown(path, uid, gid); | |
344 | } | |
345 | +EXPORT_SYMBOL(security_path_chown); | |
346 | ||
347 | int security_path_chroot(struct path *path) | |
348 | { | |
953406b4 | 349 | @@ -514,6 +523,7 @@ int security_inode_readlink(struct dentry *dentry) |
b752ccd1 AM |
350 | return 0; |
351 | return security_ops->inode_readlink(dentry); | |
352 | } | |
353 | +EXPORT_SYMBOL(security_inode_readlink); | |
354 | ||
355 | int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd) | |
356 | { | |
953406b4 | 357 | @@ -528,6 +538,7 @@ int security_inode_permission(struct inode *inode, int mask) |
b752ccd1 AM |
358 | return 0; |
359 | return security_ops->inode_permission(inode, mask); | |
360 | } | |
361 | +EXPORT_SYMBOL(security_inode_permission); | |
362 | ||
363 | int security_inode_setattr(struct dentry *dentry, struct iattr *attr) | |
364 | { | |
953406b4 AM |
365 | @@ -627,6 +638,7 @@ int security_file_permission(struct file *file, int mask) |
366 | ||
367 | return fsnotify_perm(file, mask); | |
b752ccd1 AM |
368 | } |
369 | +EXPORT_SYMBOL(security_file_permission); | |
370 | ||
371 | int security_file_alloc(struct file *file) | |
372 | { | |
953406b4 | 373 | @@ -654,6 +666,7 @@ int security_file_mmap(struct file *file, unsigned long reqprot, |
b752ccd1 AM |
374 | return ret; |
375 | return ima_file_mmap(file, prot); | |
376 | } | |
377 | +EXPORT_SYMBOL(security_file_mmap); | |
378 | ||
379 | int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot, | |
380 | unsigned long prot) | |
381 | diff -urN /usr/share/empty/Documentation/ABI/testing/debugfs-aufs linux/Documentation/ABI/testing/debugfs-aufs | |
382 | --- /usr/share/empty/Documentation/ABI/testing/debugfs-aufs 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 383 | +++ linux/Documentation/ABI/testing/debugfs-aufs 2010-10-21 09:52:43.080290296 +0200 |
4a4d8108 | 384 | @@ -0,0 +1,37 @@ |
1facf9fc | 385 | +What: /debug/aufs/si_<id>/ |
386 | +Date: March 2009 | |
387 | +Contact: J. R. Okajima <hooanon05@yahoo.co.jp> | |
388 | +Description: | |
389 | + Under /debug/aufs, a directory named si_<id> is created | |
390 | + per aufs mount, where <id> is a unique id generated | |
391 | + internally. | |
392 | + | |
393 | +What: /debug/aufs/si_<id>/xib | |
394 | +Date: March 2009 | |
395 | +Contact: J. R. Okajima <hooanon05@yahoo.co.jp> | |
396 | +Description: | |
397 | + It shows the consumed blocks by xib (External Inode Number | |
398 | + Bitmap), its block size and file size. | |
399 | + When the aufs mount option 'noxino' is specified, it | |
4a4d8108 | 400 | + will be empty. About XINO files, see the aufs manual. |
1facf9fc | 401 | + |
402 | +What: /debug/aufs/si_<id>/xino0, xino1 ... xinoN | |
403 | +Date: March 2009 | |
404 | +Contact: J. R. Okajima <hooanon05@yahoo.co.jp> | |
405 | +Description: | |
406 | + It shows the consumed blocks by xino (External Inode Number | |
407 | + Translation Table), its link count, block size and file | |
408 | + size. | |
409 | + When the aufs mount option 'noxino' is specified, it | |
4a4d8108 | 410 | + will be empty. About XINO files, see the aufs manual. |
1facf9fc | 411 | + |
412 | +What: /debug/aufs/si_<id>/xigen | |
413 | +Date: March 2009 | |
414 | +Contact: J. R. Okajima <hooanon05@yahoo.co.jp> | |
415 | +Description: | |
416 | + It shows the consumed blocks by xigen (External Inode | |
417 | + Generation Table), its block size and file size. | |
418 | + If CONFIG_AUFS_EXPORT is disabled, this entry will not | |
419 | + be created. | |
420 | + When the aufs mount option 'noxino' is specified, it | |
4a4d8108 | 421 | + will be empty. About XINO files, see the aufs manual. |
b752ccd1 AM |
422 | diff -urN /usr/share/empty/Documentation/ABI/testing/sysfs-aufs linux/Documentation/ABI/testing/sysfs-aufs |
423 | --- /usr/share/empty/Documentation/ABI/testing/sysfs-aufs 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 424 | +++ linux/Documentation/ABI/testing/sysfs-aufs 2010-10-21 09:52:43.080290296 +0200 |
4a4d8108 | 425 | @@ -0,0 +1,24 @@ |
1facf9fc | 426 | +What: /sys/fs/aufs/si_<id>/ |
427 | +Date: March 2009 | |
428 | +Contact: J. R. Okajima <hooanon05@yahoo.co.jp> | |
429 | +Description: | |
430 | + Under /sys/fs/aufs, a directory named si_<id> is created | |
431 | + per aufs mount, where <id> is a unique id generated | |
432 | + internally. | |
433 | + | |
434 | +What: /sys/fs/aufs/si_<id>/br0, br1 ... brN | |
435 | +Date: March 2009 | |
436 | +Contact: J. R. Okajima <hooanon05@yahoo.co.jp> | |
437 | +Description: | |
438 | + It shows the abolute path of a member directory (which | |
439 | + is called branch) in aufs, and its permission. | |
440 | + | |
441 | +What: /sys/fs/aufs/si_<id>/xi_path | |
442 | +Date: March 2009 | |
443 | +Contact: J. R. Okajima <hooanon05@yahoo.co.jp> | |
444 | +Description: | |
445 | + It shows the abolute path of XINO (External Inode Number | |
446 | + Bitmap, Translation Table and Generation Table) file | |
447 | + even if it is the default path. | |
448 | + When the aufs mount option 'noxino' is specified, it | |
4a4d8108 | 449 | + will be empty. About XINO files, see the aufs manual. |
b752ccd1 AM |
450 | diff -urN /usr/share/empty/fs/aufs/aufs.h linux/fs/aufs/aufs.h |
451 | --- /usr/share/empty/fs/aufs/aufs.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 452 | +++ linux/fs/aufs/aufs.h 2010-10-21 09:52:43.083624114 +0200 |
4a4d8108 | 453 | @@ -0,0 +1,61 @@ |
1facf9fc | 454 | +/* |
4a4d8108 | 455 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 456 | + * |
457 | + * This program, aufs is free software; you can redistribute it and/or modify | |
458 | + * it under the terms of the GNU General Public License as published by | |
459 | + * the Free Software Foundation; either version 2 of the License, or | |
460 | + * (at your option) any later version. | |
dece6358 AM |
461 | + * |
462 | + * This program is distributed in the hope that it will be useful, | |
463 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
464 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
465 | + * GNU General Public License for more details. | |
466 | + * | |
467 | + * You should have received a copy of the GNU General Public License | |
468 | + * along with this program; if not, write to the Free Software | |
469 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 470 | + */ |
471 | + | |
472 | +/* | |
473 | + * all header files | |
474 | + */ | |
475 | + | |
476 | +#ifndef __AUFS_H__ | |
477 | +#define __AUFS_H__ | |
478 | + | |
479 | +#ifdef __KERNEL__ | |
480 | + | |
4a4d8108 AM |
481 | +#define AuStub(type, name, body, ...) \ |
482 | + static inline type name(__VA_ARGS__) { body; } | |
483 | + | |
484 | +#define AuStubVoid(name, ...) \ | |
485 | + AuStub(void, name, , __VA_ARGS__) | |
486 | +#define AuStubInt0(name, ...) \ | |
487 | + AuStub(int, name, return 0, __VA_ARGS__) | |
488 | + | |
1facf9fc | 489 | +#include "debug.h" |
490 | + | |
491 | +#include "branch.h" | |
492 | +#include "cpup.h" | |
493 | +#include "dcsub.h" | |
494 | +#include "dbgaufs.h" | |
495 | +#include "dentry.h" | |
496 | +#include "dir.h" | |
4a4d8108 | 497 | +#include "dynop.h" |
1facf9fc | 498 | +#include "file.h" |
499 | +#include "fstype.h" | |
500 | +#include "inode.h" | |
501 | +#include "loop.h" | |
502 | +#include "module.h" | |
4a4d8108 | 503 | +/* never include ./mtx.h */ |
1facf9fc | 504 | +#include "opts.h" |
505 | +#include "rwsem.h" | |
506 | +#include "spl.h" | |
507 | +#include "super.h" | |
508 | +#include "sysaufs.h" | |
509 | +#include "vfsub.h" | |
510 | +#include "whout.h" | |
511 | +#include "wkq.h" | |
512 | + | |
513 | +#endif /* __KERNEL__ */ | |
514 | +#endif /* __AUFS_H__ */ | |
b752ccd1 AM |
515 | diff -urN /usr/share/empty/fs/aufs/branch.c linux/fs/aufs/branch.c |
516 | --- /usr/share/empty/fs/aufs/branch.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
517 | +++ linux/fs/aufs/branch.c 2010-10-21 09:52:43.086957936 +0200 |
518 | @@ -0,0 +1,1005 @@ | |
1facf9fc | 519 | +/* |
4a4d8108 | 520 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 521 | + * |
522 | + * This program, aufs is free software; you can redistribute it and/or modify | |
523 | + * it under the terms of the GNU General Public License as published by | |
524 | + * the Free Software Foundation; either version 2 of the License, or | |
525 | + * (at your option) any later version. | |
dece6358 AM |
526 | + * |
527 | + * This program is distributed in the hope that it will be useful, | |
528 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
529 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
530 | + * GNU General Public License for more details. | |
531 | + * | |
532 | + * You should have received a copy of the GNU General Public License | |
533 | + * along with this program; if not, write to the Free Software | |
534 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 535 | + */ |
536 | + | |
537 | +/* | |
538 | + * branch management | |
539 | + */ | |
540 | + | |
dece6358 | 541 | +#include <linux/file.h> |
4a4d8108 | 542 | +#include <linux/statfs.h> |
1facf9fc | 543 | +#include "aufs.h" |
544 | + | |
545 | +/* | |
546 | + * free a single branch | |
547 | + */ | |
548 | +static void au_br_do_free(struct au_branch *br) | |
549 | +{ | |
550 | + int i; | |
551 | + struct au_wbr *wbr; | |
4a4d8108 | 552 | + struct au_dykey **key; |
1facf9fc | 553 | + |
554 | + if (br->br_xino.xi_file) | |
555 | + fput(br->br_xino.xi_file); | |
556 | + mutex_destroy(&br->br_xino.xi_nondir_mtx); | |
557 | + | |
558 | + AuDebugOn(atomic_read(&br->br_count)); | |
559 | + | |
560 | + wbr = br->br_wbr; | |
561 | + if (wbr) { | |
562 | + for (i = 0; i < AuBrWh_Last; i++) | |
563 | + dput(wbr->wbr_wh[i]); | |
564 | + AuDebugOn(atomic_read(&wbr->wbr_wh_running)); | |
dece6358 | 565 | + AuRwDestroy(&wbr->wbr_wh_rwsem); |
1facf9fc | 566 | + } |
567 | + | |
4a4d8108 AM |
568 | + key = br->br_dykey; |
569 | + for (i = 0; i < AuBrDynOp; i++, key++) | |
570 | + if (*key) | |
571 | + au_dy_put(*key); | |
572 | + else | |
573 | + break; | |
574 | + | |
1facf9fc | 575 | + mntput(br->br_mnt); |
1facf9fc | 576 | + kfree(wbr); |
577 | + kfree(br); | |
578 | +} | |
579 | + | |
580 | +/* | |
581 | + * frees all branches | |
582 | + */ | |
583 | +void au_br_free(struct au_sbinfo *sbinfo) | |
584 | +{ | |
585 | + aufs_bindex_t bmax; | |
586 | + struct au_branch **br; | |
587 | + | |
dece6358 AM |
588 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
589 | + | |
1facf9fc | 590 | + bmax = sbinfo->si_bend + 1; |
591 | + br = sbinfo->si_branch; | |
592 | + while (bmax--) | |
593 | + au_br_do_free(*br++); | |
594 | +} | |
595 | + | |
596 | +/* | |
597 | + * find the index of a branch which is specified by @br_id. | |
598 | + */ | |
599 | +int au_br_index(struct super_block *sb, aufs_bindex_t br_id) | |
600 | +{ | |
601 | + aufs_bindex_t bindex, bend; | |
602 | + | |
603 | + bend = au_sbend(sb); | |
604 | + for (bindex = 0; bindex <= bend; bindex++) | |
605 | + if (au_sbr_id(sb, bindex) == br_id) | |
606 | + return bindex; | |
607 | + return -1; | |
608 | +} | |
609 | + | |
610 | +/* ---------------------------------------------------------------------- */ | |
611 | + | |
612 | +/* | |
613 | + * add a branch | |
614 | + */ | |
615 | + | |
b752ccd1 AM |
616 | +static int test_overlap(struct super_block *sb, struct dentry *h_adding, |
617 | + struct dentry *h_root) | |
1facf9fc | 618 | +{ |
b752ccd1 AM |
619 | + if (unlikely(h_adding == h_root |
620 | + || au_test_loopback_overlap(sb, h_adding))) | |
1facf9fc | 621 | + return 1; |
b752ccd1 AM |
622 | + if (h_adding->d_sb != h_root->d_sb) |
623 | + return 0; | |
624 | + return au_test_subdir(h_adding, h_root) | |
625 | + || au_test_subdir(h_root, h_adding); | |
1facf9fc | 626 | +} |
627 | + | |
628 | +/* | |
629 | + * returns a newly allocated branch. @new_nbranch is a number of branches | |
630 | + * after adding a branch. | |
631 | + */ | |
632 | +static struct au_branch *au_br_alloc(struct super_block *sb, int new_nbranch, | |
633 | + int perm) | |
634 | +{ | |
635 | + struct au_branch *add_branch; | |
636 | + struct dentry *root; | |
4a4d8108 | 637 | + int err; |
1facf9fc | 638 | + |
4a4d8108 | 639 | + err = -ENOMEM; |
1facf9fc | 640 | + root = sb->s_root; |
641 | + add_branch = kmalloc(sizeof(*add_branch), GFP_NOFS); | |
642 | + if (unlikely(!add_branch)) | |
643 | + goto out; | |
644 | + | |
645 | + add_branch->br_wbr = NULL; | |
646 | + if (au_br_writable(perm)) { | |
647 | + /* may be freed separately at changing the branch permission */ | |
648 | + add_branch->br_wbr = kmalloc(sizeof(*add_branch->br_wbr), | |
649 | + GFP_NOFS); | |
650 | + if (unlikely(!add_branch->br_wbr)) | |
651 | + goto out_br; | |
652 | + } | |
653 | + | |
4a4d8108 AM |
654 | + err = au_sbr_realloc(au_sbi(sb), new_nbranch); |
655 | + if (!err) | |
656 | + err = au_di_realloc(au_di(root), new_nbranch); | |
657 | + if (!err) | |
658 | + err = au_ii_realloc(au_ii(root->d_inode), new_nbranch); | |
659 | + if (!err) | |
660 | + return add_branch; /* success */ | |
1facf9fc | 661 | + |
1facf9fc | 662 | + kfree(add_branch->br_wbr); |
4a4d8108 | 663 | + |
4f0767ce | 664 | +out_br: |
1facf9fc | 665 | + kfree(add_branch); |
4f0767ce | 666 | +out: |
4a4d8108 | 667 | + return ERR_PTR(err); |
1facf9fc | 668 | +} |
669 | + | |
670 | +/* | |
671 | + * test if the branch permission is legal or not. | |
672 | + */ | |
673 | +static int test_br(struct inode *inode, int brperm, char *path) | |
674 | +{ | |
675 | + int err; | |
676 | + | |
4a4d8108 AM |
677 | + err = (au_br_writable(brperm) && IS_RDONLY(inode)); |
678 | + if (!err) | |
679 | + goto out; | |
1facf9fc | 680 | + |
4a4d8108 AM |
681 | + err = -EINVAL; |
682 | + pr_err("write permission for readonly mount or inode, %s\n", path); | |
683 | + | |
4f0767ce | 684 | +out: |
1facf9fc | 685 | + return err; |
686 | +} | |
687 | + | |
688 | +/* | |
689 | + * returns: | |
690 | + * 0: success, the caller will add it | |
691 | + * plus: success, it is already unified, the caller should ignore it | |
692 | + * minus: error | |
693 | + */ | |
694 | +static int test_add(struct super_block *sb, struct au_opt_add *add, int remount) | |
695 | +{ | |
696 | + int err; | |
697 | + aufs_bindex_t bend, bindex; | |
698 | + struct dentry *root; | |
699 | + struct inode *inode, *h_inode; | |
700 | + | |
701 | + root = sb->s_root; | |
702 | + bend = au_sbend(sb); | |
703 | + if (unlikely(bend >= 0 | |
704 | + && au_find_dbindex(root, add->path.dentry) >= 0)) { | |
705 | + err = 1; | |
706 | + if (!remount) { | |
707 | + err = -EINVAL; | |
4a4d8108 | 708 | + pr_err("%s duplicated\n", add->pathname); |
1facf9fc | 709 | + } |
710 | + goto out; | |
711 | + } | |
712 | + | |
713 | + err = -ENOSPC; /* -E2BIG; */ | |
714 | + if (unlikely(AUFS_BRANCH_MAX <= add->bindex | |
715 | + || AUFS_BRANCH_MAX - 1 <= bend)) { | |
4a4d8108 | 716 | + pr_err("number of branches exceeded %s\n", add->pathname); |
1facf9fc | 717 | + goto out; |
718 | + } | |
719 | + | |
720 | + err = -EDOM; | |
721 | + if (unlikely(add->bindex < 0 || bend + 1 < add->bindex)) { | |
4a4d8108 | 722 | + pr_err("bad index %d\n", add->bindex); |
1facf9fc | 723 | + goto out; |
724 | + } | |
725 | + | |
726 | + inode = add->path.dentry->d_inode; | |
727 | + err = -ENOENT; | |
728 | + if (unlikely(!inode->i_nlink)) { | |
4a4d8108 | 729 | + pr_err("no existence %s\n", add->pathname); |
1facf9fc | 730 | + goto out; |
731 | + } | |
732 | + | |
733 | + err = -EINVAL; | |
734 | + if (unlikely(inode->i_sb == sb)) { | |
4a4d8108 | 735 | + pr_err("%s must be outside\n", add->pathname); |
1facf9fc | 736 | + goto out; |
737 | + } | |
738 | + | |
739 | + if (unlikely(au_test_fs_unsuppoted(inode->i_sb))) { | |
4a4d8108 AM |
740 | + pr_err("unsupported filesystem, %s (%s)\n", |
741 | + add->pathname, au_sbtype(inode->i_sb)); | |
1facf9fc | 742 | + goto out; |
743 | + } | |
744 | + | |
745 | + err = test_br(add->path.dentry->d_inode, add->perm, add->pathname); | |
746 | + if (unlikely(err)) | |
747 | + goto out; | |
748 | + | |
749 | + if (bend < 0) | |
750 | + return 0; /* success */ | |
751 | + | |
752 | + err = -EINVAL; | |
753 | + for (bindex = 0; bindex <= bend; bindex++) | |
754 | + if (unlikely(test_overlap(sb, add->path.dentry, | |
755 | + au_h_dptr(root, bindex)))) { | |
4a4d8108 | 756 | + pr_err("%s is overlapped\n", add->pathname); |
1facf9fc | 757 | + goto out; |
758 | + } | |
759 | + | |
760 | + err = 0; | |
761 | + if (au_opt_test(au_mntflags(sb), WARN_PERM)) { | |
762 | + h_inode = au_h_dptr(root, 0)->d_inode; | |
763 | + if ((h_inode->i_mode & S_IALLUGO) != (inode->i_mode & S_IALLUGO) | |
764 | + || h_inode->i_uid != inode->i_uid | |
765 | + || h_inode->i_gid != inode->i_gid) | |
4a4d8108 AM |
766 | + pr_warning("uid/gid/perm %s %u/%u/0%o, %u/%u/0%o\n", |
767 | + add->pathname, | |
768 | + inode->i_uid, inode->i_gid, | |
769 | + (inode->i_mode & S_IALLUGO), | |
770 | + h_inode->i_uid, h_inode->i_gid, | |
771 | + (h_inode->i_mode & S_IALLUGO)); | |
1facf9fc | 772 | + } |
773 | + | |
4f0767ce | 774 | +out: |
1facf9fc | 775 | + return err; |
776 | +} | |
777 | + | |
778 | +/* | |
779 | + * initialize or clean the whiteouts for an adding branch | |
780 | + */ | |
781 | +static int au_br_init_wh(struct super_block *sb, struct au_branch *br, | |
782 | + int new_perm, struct dentry *h_root) | |
783 | +{ | |
784 | + int err, old_perm; | |
785 | + aufs_bindex_t bindex; | |
786 | + struct mutex *h_mtx; | |
787 | + struct au_wbr *wbr; | |
788 | + struct au_hinode *hdir; | |
789 | + | |
790 | + wbr = br->br_wbr; | |
791 | + old_perm = br->br_perm; | |
792 | + br->br_perm = new_perm; | |
793 | + hdir = NULL; | |
794 | + h_mtx = NULL; | |
795 | + bindex = au_br_index(sb, br->br_id); | |
796 | + if (0 <= bindex) { | |
797 | + hdir = au_hi(sb->s_root->d_inode, bindex); | |
4a4d8108 | 798 | + au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT); |
1facf9fc | 799 | + } else { |
800 | + h_mtx = &h_root->d_inode->i_mutex; | |
801 | + mutex_lock_nested(h_mtx, AuLsc_I_PARENT); | |
802 | + } | |
803 | + if (!wbr) | |
804 | + err = au_wh_init(h_root, br, sb); | |
805 | + else { | |
806 | + wbr_wh_write_lock(wbr); | |
807 | + err = au_wh_init(h_root, br, sb); | |
808 | + wbr_wh_write_unlock(wbr); | |
809 | + } | |
810 | + if (hdir) | |
4a4d8108 | 811 | + au_hn_imtx_unlock(hdir); |
1facf9fc | 812 | + else |
813 | + mutex_unlock(h_mtx); | |
814 | + br->br_perm = old_perm; | |
815 | + | |
816 | + if (!err && wbr && !au_br_writable(new_perm)) { | |
817 | + kfree(wbr); | |
818 | + br->br_wbr = NULL; | |
819 | + } | |
820 | + | |
821 | + return err; | |
822 | +} | |
823 | + | |
824 | +static int au_wbr_init(struct au_branch *br, struct super_block *sb, | |
825 | + int perm, struct path *path) | |
826 | +{ | |
827 | + int err; | |
4a4d8108 | 828 | + struct kstatfs kst; |
1facf9fc | 829 | + struct au_wbr *wbr; |
4a4d8108 | 830 | + struct dentry *h_dentry; |
1facf9fc | 831 | + |
832 | + wbr = br->br_wbr; | |
dece6358 | 833 | + au_rw_init(&wbr->wbr_wh_rwsem); |
1facf9fc | 834 | + memset(wbr->wbr_wh, 0, sizeof(wbr->wbr_wh)); |
835 | + atomic_set(&wbr->wbr_wh_running, 0); | |
836 | + wbr->wbr_bytes = 0; | |
837 | + | |
4a4d8108 AM |
838 | + /* |
839 | + * a limit for rmdir/rename a dir | |
840 | + * cf. AUFS_MAX_NAMELEN in include/linux/aufs_type.h | |
841 | + */ | |
953406b4 | 842 | + err = vfs_statfs(path, &kst); |
4a4d8108 AM |
843 | + if (unlikely(err)) |
844 | + goto out; | |
845 | + err = -EINVAL; | |
953406b4 | 846 | + h_dentry = path->dentry; |
4a4d8108 AM |
847 | + if (kst.f_namelen >= NAME_MAX) |
848 | + err = au_br_init_wh(sb, br, perm, h_dentry); | |
849 | + else | |
850 | + pr_err("%.*s(%s), unsupported namelen %ld\n", | |
851 | + AuDLNPair(h_dentry), au_sbtype(h_dentry->d_sb), | |
852 | + kst.f_namelen); | |
1facf9fc | 853 | + |
4f0767ce | 854 | +out: |
1facf9fc | 855 | + return err; |
856 | +} | |
857 | + | |
858 | +/* intialize a new branch */ | |
859 | +static int au_br_init(struct au_branch *br, struct super_block *sb, | |
860 | + struct au_opt_add *add) | |
861 | +{ | |
862 | + int err; | |
863 | + | |
864 | + err = 0; | |
865 | + memset(&br->br_xino, 0, sizeof(br->br_xino)); | |
866 | + mutex_init(&br->br_xino.xi_nondir_mtx); | |
867 | + br->br_perm = add->perm; | |
868 | + br->br_mnt = add->path.mnt; /* set first, mntget() later */ | |
4a4d8108 AM |
869 | + spin_lock_init(&br->br_dykey_lock); |
870 | + memset(br->br_dykey, 0, sizeof(br->br_dykey)); | |
1facf9fc | 871 | + atomic_set(&br->br_count, 0); |
872 | + br->br_xino_upper = AUFS_XINO_TRUNC_INIT; | |
873 | + atomic_set(&br->br_xino_running, 0); | |
874 | + br->br_id = au_new_br_id(sb); | |
875 | + | |
876 | + if (au_br_writable(add->perm)) { | |
877 | + err = au_wbr_init(br, sb, add->perm, &add->path); | |
878 | + if (unlikely(err)) | |
b752ccd1 | 879 | + goto out_err; |
1facf9fc | 880 | + } |
881 | + | |
882 | + if (au_opt_test(au_mntflags(sb), XINO)) { | |
883 | + err = au_xino_br(sb, br, add->path.dentry->d_inode->i_ino, | |
884 | + au_sbr(sb, 0)->br_xino.xi_file, /*do_test*/1); | |
885 | + if (unlikely(err)) { | |
886 | + AuDebugOn(br->br_xino.xi_file); | |
b752ccd1 | 887 | + goto out_err; |
1facf9fc | 888 | + } |
889 | + } | |
890 | + | |
891 | + sysaufs_br_init(br); | |
892 | + mntget(add->path.mnt); | |
b752ccd1 | 893 | + goto out; /* success */ |
1facf9fc | 894 | + |
4f0767ce | 895 | +out_err: |
b752ccd1 | 896 | + br->br_mnt = NULL; |
4f0767ce | 897 | +out: |
1facf9fc | 898 | + return err; |
899 | +} | |
900 | + | |
901 | +static void au_br_do_add_brp(struct au_sbinfo *sbinfo, aufs_bindex_t bindex, | |
902 | + struct au_branch *br, aufs_bindex_t bend, | |
903 | + aufs_bindex_t amount) | |
904 | +{ | |
905 | + struct au_branch **brp; | |
906 | + | |
dece6358 AM |
907 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
908 | + | |
1facf9fc | 909 | + brp = sbinfo->si_branch + bindex; |
910 | + memmove(brp + 1, brp, sizeof(*brp) * amount); | |
911 | + *brp = br; | |
912 | + sbinfo->si_bend++; | |
913 | + if (unlikely(bend < 0)) | |
914 | + sbinfo->si_bend = 0; | |
915 | +} | |
916 | + | |
917 | +static void au_br_do_add_hdp(struct au_dinfo *dinfo, aufs_bindex_t bindex, | |
918 | + aufs_bindex_t bend, aufs_bindex_t amount) | |
919 | +{ | |
920 | + struct au_hdentry *hdp; | |
921 | + | |
1308ab2a | 922 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
923 | + | |
1facf9fc | 924 | + hdp = dinfo->di_hdentry + bindex; |
925 | + memmove(hdp + 1, hdp, sizeof(*hdp) * amount); | |
926 | + au_h_dentry_init(hdp); | |
927 | + dinfo->di_bend++; | |
928 | + if (unlikely(bend < 0)) | |
929 | + dinfo->di_bstart = 0; | |
930 | +} | |
931 | + | |
932 | +static void au_br_do_add_hip(struct au_iinfo *iinfo, aufs_bindex_t bindex, | |
933 | + aufs_bindex_t bend, aufs_bindex_t amount) | |
934 | +{ | |
935 | + struct au_hinode *hip; | |
936 | + | |
1308ab2a | 937 | + AuRwMustWriteLock(&iinfo->ii_rwsem); |
938 | + | |
1facf9fc | 939 | + hip = iinfo->ii_hinode + bindex; |
940 | + memmove(hip + 1, hip, sizeof(*hip) * amount); | |
941 | + hip->hi_inode = NULL; | |
4a4d8108 | 942 | + au_hn_init(hip); |
1facf9fc | 943 | + iinfo->ii_bend++; |
944 | + if (unlikely(bend < 0)) | |
945 | + iinfo->ii_bstart = 0; | |
946 | +} | |
947 | + | |
948 | +static void au_br_do_add(struct super_block *sb, struct dentry *h_dentry, | |
949 | + struct au_branch *br, aufs_bindex_t bindex) | |
950 | +{ | |
951 | + struct dentry *root; | |
952 | + struct inode *root_inode; | |
953 | + aufs_bindex_t bend, amount; | |
954 | + | |
955 | + root = sb->s_root; | |
956 | + root_inode = root->d_inode; | |
953406b4 | 957 | + au_plink_maint_block(sb); |
1facf9fc | 958 | + bend = au_sbend(sb); |
959 | + amount = bend + 1 - bindex; | |
960 | + au_br_do_add_brp(au_sbi(sb), bindex, br, bend, amount); | |
961 | + au_br_do_add_hdp(au_di(root), bindex, bend, amount); | |
962 | + au_br_do_add_hip(au_ii(root_inode), bindex, bend, amount); | |
963 | + au_set_h_dptr(root, bindex, dget(h_dentry)); | |
964 | + au_set_h_iptr(root_inode, bindex, au_igrab(h_dentry->d_inode), | |
965 | + /*flags*/0); | |
966 | +} | |
967 | + | |
968 | +int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount) | |
969 | +{ | |
970 | + int err; | |
1facf9fc | 971 | + aufs_bindex_t bend, add_bindex; |
972 | + struct dentry *root, *h_dentry; | |
973 | + struct inode *root_inode; | |
974 | + struct au_branch *add_branch; | |
975 | + | |
976 | + root = sb->s_root; | |
977 | + root_inode = root->d_inode; | |
978 | + IMustLock(root_inode); | |
979 | + err = test_add(sb, add, remount); | |
980 | + if (unlikely(err < 0)) | |
981 | + goto out; | |
982 | + if (err) { | |
983 | + err = 0; | |
984 | + goto out; /* success */ | |
985 | + } | |
986 | + | |
987 | + bend = au_sbend(sb); | |
988 | + add_branch = au_br_alloc(sb, bend + 2, add->perm); | |
989 | + err = PTR_ERR(add_branch); | |
990 | + if (IS_ERR(add_branch)) | |
991 | + goto out; | |
992 | + | |
993 | + err = au_br_init(add_branch, sb, add); | |
994 | + if (unlikely(err)) { | |
995 | + au_br_do_free(add_branch); | |
996 | + goto out; | |
997 | + } | |
998 | + | |
999 | + add_bindex = add->bindex; | |
1000 | + h_dentry = add->path.dentry; | |
1001 | + if (!remount) | |
1002 | + au_br_do_add(sb, h_dentry, add_branch, add_bindex); | |
1003 | + else { | |
1004 | + sysaufs_brs_del(sb, add_bindex); | |
1005 | + au_br_do_add(sb, h_dentry, add_branch, add_bindex); | |
1006 | + sysaufs_brs_add(sb, add_bindex); | |
1007 | + } | |
1008 | + | |
1308ab2a | 1009 | + if (!add_bindex) { |
1facf9fc | 1010 | + au_cpup_attr_all(root_inode, /*force*/1); |
1308ab2a | 1011 | + sb->s_maxbytes = h_dentry->d_sb->s_maxbytes; |
1012 | + } else | |
1facf9fc | 1013 | + au_add_nlink(root_inode, h_dentry->d_inode); |
1facf9fc | 1014 | + |
1015 | + /* | |
4a4d8108 | 1016 | + * this test/set prevents aufs from handling unnecesary notify events |
1facf9fc | 1017 | + * of xino files, in a case of re-adding a writable branch which was |
1018 | + * once detached from aufs. | |
1019 | + */ | |
1020 | + if (au_xino_brid(sb) < 0 | |
1021 | + && au_br_writable(add_branch->br_perm) | |
1022 | + && !au_test_fs_bad_xino(h_dentry->d_sb) | |
1023 | + && add_branch->br_xino.xi_file | |
1024 | + && add_branch->br_xino.xi_file->f_dentry->d_parent == h_dentry) | |
1025 | + au_xino_brid_set(sb, add_branch->br_id); | |
1026 | + | |
4f0767ce | 1027 | +out: |
1facf9fc | 1028 | + return err; |
1029 | +} | |
1030 | + | |
1031 | +/* ---------------------------------------------------------------------- */ | |
1032 | + | |
1033 | +/* | |
1034 | + * delete a branch | |
1035 | + */ | |
1036 | + | |
1037 | +/* to show the line number, do not make it inlined function */ | |
4a4d8108 | 1038 | +#define AuVerbose(do_info, fmt, ...) do { \ |
1facf9fc | 1039 | + if (do_info) \ |
4a4d8108 | 1040 | + pr_info(fmt, ##__VA_ARGS__); \ |
1facf9fc | 1041 | +} while (0) |
1042 | + | |
1043 | +/* | |
1044 | + * test if the branch is deletable or not. | |
1045 | + */ | |
1046 | +static int test_dentry_busy(struct dentry *root, aufs_bindex_t bindex, | |
b752ccd1 | 1047 | + unsigned int sigen, const unsigned int verbose) |
1facf9fc | 1048 | +{ |
1049 | + int err, i, j, ndentry; | |
1050 | + aufs_bindex_t bstart, bend; | |
1facf9fc | 1051 | + struct au_dcsub_pages dpages; |
1052 | + struct au_dpage *dpage; | |
1053 | + struct dentry *d; | |
1054 | + struct inode *inode; | |
1055 | + | |
1056 | + err = au_dpages_init(&dpages, GFP_NOFS); | |
1057 | + if (unlikely(err)) | |
1058 | + goto out; | |
1059 | + err = au_dcsub_pages(&dpages, root, NULL, NULL); | |
1060 | + if (unlikely(err)) | |
1061 | + goto out_dpages; | |
1062 | + | |
1facf9fc | 1063 | + for (i = 0; !err && i < dpages.ndpage; i++) { |
1064 | + dpage = dpages.dpages + i; | |
1065 | + ndentry = dpage->ndentry; | |
1066 | + for (j = 0; !err && j < ndentry; j++) { | |
1067 | + d = dpage->dentries[j]; | |
1068 | + AuDebugOn(!atomic_read(&d->d_count)); | |
1069 | + inode = d->d_inode; | |
1070 | + if (au_digen(d) == sigen && au_iigen(inode) == sigen) | |
1071 | + di_read_lock_child(d, AuLock_IR); | |
1072 | + else { | |
1073 | + di_write_lock_child(d); | |
1074 | + err = au_reval_dpath(d, sigen); | |
1075 | + if (!err) | |
1076 | + di_downgrade_lock(d, AuLock_IR); | |
1077 | + else { | |
1078 | + di_write_unlock(d); | |
1079 | + break; | |
1080 | + } | |
1081 | + } | |
1082 | + | |
1083 | + bstart = au_dbstart(d); | |
1084 | + bend = au_dbend(d); | |
1085 | + if (bstart <= bindex | |
1086 | + && bindex <= bend | |
1087 | + && au_h_dptr(d, bindex) | |
1088 | + && (!S_ISDIR(inode->i_mode) || bstart == bend)) { | |
1089 | + err = -EBUSY; | |
1090 | + AuVerbose(verbose, "busy %.*s\n", AuDLNPair(d)); | |
1091 | + } | |
1092 | + di_read_unlock(d, AuLock_IR); | |
1093 | + } | |
1094 | + } | |
1095 | + | |
4f0767ce | 1096 | +out_dpages: |
1facf9fc | 1097 | + au_dpages_free(&dpages); |
4f0767ce | 1098 | +out: |
1facf9fc | 1099 | + return err; |
1100 | +} | |
1101 | + | |
1102 | +static int test_inode_busy(struct super_block *sb, aufs_bindex_t bindex, | |
b752ccd1 | 1103 | + unsigned int sigen, const unsigned int verbose) |
1facf9fc | 1104 | +{ |
1105 | + int err; | |
1106 | + struct inode *i; | |
1107 | + aufs_bindex_t bstart, bend; | |
1facf9fc | 1108 | + |
1109 | + err = 0; | |
1facf9fc | 1110 | + list_for_each_entry(i, &sb->s_inodes, i_sb_list) { |
1111 | + AuDebugOn(!atomic_read(&i->i_count)); | |
1112 | + if (!list_empty(&i->i_dentry)) | |
1113 | + continue; | |
1114 | + | |
1115 | + if (au_iigen(i) == sigen) | |
1116 | + ii_read_lock_child(i); | |
1117 | + else { | |
1118 | + ii_write_lock_child(i); | |
1119 | + err = au_refresh_hinode_self(i, /*do_attr*/1); | |
1120 | + if (!err) | |
1121 | + ii_downgrade_lock(i); | |
1122 | + else { | |
1123 | + ii_write_unlock(i); | |
1124 | + break; | |
1125 | + } | |
1126 | + } | |
1127 | + | |
1128 | + bstart = au_ibstart(i); | |
1129 | + bend = au_ibend(i); | |
1130 | + if (bstart <= bindex | |
1131 | + && bindex <= bend | |
1132 | + && au_h_iptr(i, bindex) | |
1133 | + && (!S_ISDIR(i->i_mode) || bstart == bend)) { | |
1134 | + err = -EBUSY; | |
1135 | + AuVerbose(verbose, "busy i%lu\n", i->i_ino); | |
1136 | + ii_read_unlock(i); | |
1137 | + break; | |
1138 | + } | |
1139 | + ii_read_unlock(i); | |
1140 | + } | |
1141 | + | |
1142 | + return err; | |
1143 | +} | |
1144 | + | |
b752ccd1 AM |
1145 | +static int test_children_busy(struct dentry *root, aufs_bindex_t bindex, |
1146 | + const unsigned int verbose) | |
1facf9fc | 1147 | +{ |
1148 | + int err; | |
1149 | + unsigned int sigen; | |
1150 | + | |
1151 | + sigen = au_sigen(root->d_sb); | |
1152 | + DiMustNoWaiters(root); | |
1153 | + IiMustNoWaiters(root->d_inode); | |
1154 | + di_write_unlock(root); | |
b752ccd1 | 1155 | + err = test_dentry_busy(root, bindex, sigen, verbose); |
1facf9fc | 1156 | + if (!err) |
b752ccd1 | 1157 | + err = test_inode_busy(root->d_sb, bindex, sigen, verbose); |
1facf9fc | 1158 | + di_write_lock_child(root); /* aufs_write_lock() calls ..._child() */ |
1159 | + | |
1160 | + return err; | |
1161 | +} | |
1162 | + | |
1163 | +static void au_br_do_del_brp(struct au_sbinfo *sbinfo, | |
1164 | + const aufs_bindex_t bindex, | |
1165 | + const aufs_bindex_t bend) | |
1166 | +{ | |
1167 | + struct au_branch **brp, **p; | |
1168 | + | |
dece6358 AM |
1169 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
1170 | + | |
1facf9fc | 1171 | + brp = sbinfo->si_branch + bindex; |
1172 | + if (bindex < bend) | |
1173 | + memmove(brp, brp + 1, sizeof(*brp) * (bend - bindex)); | |
1174 | + sbinfo->si_branch[0 + bend] = NULL; | |
1175 | + sbinfo->si_bend--; | |
1176 | + | |
1177 | + p = krealloc(sbinfo->si_branch, sizeof(*p) * bend, GFP_NOFS); | |
1178 | + if (p) | |
1179 | + sbinfo->si_branch = p; | |
4a4d8108 | 1180 | + /* harmless error */ |
1facf9fc | 1181 | +} |
1182 | + | |
1183 | +static void au_br_do_del_hdp(struct au_dinfo *dinfo, const aufs_bindex_t bindex, | |
1184 | + const aufs_bindex_t bend) | |
1185 | +{ | |
1186 | + struct au_hdentry *hdp, *p; | |
1187 | + | |
1308ab2a | 1188 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
1189 | + | |
4a4d8108 | 1190 | + hdp = dinfo->di_hdentry; |
1facf9fc | 1191 | + if (bindex < bend) |
4a4d8108 AM |
1192 | + memmove(hdp + bindex, hdp + bindex + 1, |
1193 | + sizeof(*hdp) * (bend - bindex)); | |
1194 | + hdp[0 + bend].hd_dentry = NULL; | |
1facf9fc | 1195 | + dinfo->di_bend--; |
1196 | + | |
4a4d8108 | 1197 | + p = krealloc(hdp, sizeof(*p) * bend, GFP_NOFS); |
1facf9fc | 1198 | + if (p) |
1199 | + dinfo->di_hdentry = p; | |
4a4d8108 | 1200 | + /* harmless error */ |
1facf9fc | 1201 | +} |
1202 | + | |
1203 | +static void au_br_do_del_hip(struct au_iinfo *iinfo, const aufs_bindex_t bindex, | |
1204 | + const aufs_bindex_t bend) | |
1205 | +{ | |
1206 | + struct au_hinode *hip, *p; | |
1207 | + | |
1308ab2a | 1208 | + AuRwMustWriteLock(&iinfo->ii_rwsem); |
1209 | + | |
1facf9fc | 1210 | + hip = iinfo->ii_hinode + bindex; |
1211 | + if (bindex < bend) | |
1212 | + memmove(hip, hip + 1, sizeof(*hip) * (bend - bindex)); | |
1213 | + iinfo->ii_hinode[0 + bend].hi_inode = NULL; | |
4a4d8108 | 1214 | + au_hn_init(iinfo->ii_hinode + bend); |
1facf9fc | 1215 | + iinfo->ii_bend--; |
1216 | + | |
1217 | + p = krealloc(iinfo->ii_hinode, sizeof(*p) * bend, GFP_NOFS); | |
1218 | + if (p) | |
1219 | + iinfo->ii_hinode = p; | |
4a4d8108 | 1220 | + /* harmless error */ |
1facf9fc | 1221 | +} |
1222 | + | |
1223 | +static void au_br_do_del(struct super_block *sb, aufs_bindex_t bindex, | |
1224 | + struct au_branch *br) | |
1225 | +{ | |
1226 | + aufs_bindex_t bend; | |
1227 | + struct au_sbinfo *sbinfo; | |
1228 | + struct dentry *root; | |
1229 | + struct inode *inode; | |
1230 | + | |
dece6358 AM |
1231 | + SiMustWriteLock(sb); |
1232 | + | |
1facf9fc | 1233 | + root = sb->s_root; |
1234 | + inode = root->d_inode; | |
953406b4 | 1235 | + au_plink_maint_block(sb); |
1facf9fc | 1236 | + sbinfo = au_sbi(sb); |
1237 | + bend = sbinfo->si_bend; | |
1238 | + | |
1239 | + dput(au_h_dptr(root, bindex)); | |
1240 | + au_hiput(au_hi(inode, bindex)); | |
1241 | + au_br_do_free(br); | |
1242 | + | |
1243 | + au_br_do_del_brp(sbinfo, bindex, bend); | |
1244 | + au_br_do_del_hdp(au_di(root), bindex, bend); | |
1245 | + au_br_do_del_hip(au_ii(inode), bindex, bend); | |
1246 | +} | |
1247 | + | |
1248 | +int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount) | |
1249 | +{ | |
1250 | + int err, rerr, i; | |
1251 | + unsigned int mnt_flags; | |
1252 | + aufs_bindex_t bindex, bend, br_id; | |
1253 | + unsigned char do_wh, verbose; | |
1254 | + struct au_branch *br; | |
1255 | + struct au_wbr *wbr; | |
1256 | + | |
1257 | + err = 0; | |
1258 | + bindex = au_find_dbindex(sb->s_root, del->h_path.dentry); | |
1259 | + if (bindex < 0) { | |
1260 | + if (remount) | |
1261 | + goto out; /* success */ | |
1262 | + err = -ENOENT; | |
4a4d8108 | 1263 | + pr_err("%s no such branch\n", del->pathname); |
1facf9fc | 1264 | + goto out; |
1265 | + } | |
1266 | + AuDbg("bindex b%d\n", bindex); | |
1267 | + | |
1268 | + err = -EBUSY; | |
1269 | + mnt_flags = au_mntflags(sb); | |
1270 | + verbose = !!au_opt_test(mnt_flags, VERBOSE); | |
1271 | + bend = au_sbend(sb); | |
1272 | + if (unlikely(!bend)) { | |
1273 | + AuVerbose(verbose, "no more branches left\n"); | |
1274 | + goto out; | |
1275 | + } | |
1276 | + br = au_sbr(sb, bindex); | |
1277 | + i = atomic_read(&br->br_count); | |
1278 | + if (unlikely(i)) { | |
1279 | + AuVerbose(verbose, "%d file(s) opened\n", i); | |
953406b4 AM |
1280 | + if (!verbose) |
1281 | + goto out; | |
1facf9fc | 1282 | + } |
1283 | + | |
1284 | + wbr = br->br_wbr; | |
1285 | + do_wh = wbr && (wbr->wbr_whbase || wbr->wbr_plink || wbr->wbr_orph); | |
1286 | + if (do_wh) { | |
1308ab2a | 1287 | + /* instead of WbrWhMustWriteLock(wbr) */ |
1288 | + SiMustWriteLock(sb); | |
1facf9fc | 1289 | + for (i = 0; i < AuBrWh_Last; i++) { |
1290 | + dput(wbr->wbr_wh[i]); | |
1291 | + wbr->wbr_wh[i] = NULL; | |
1292 | + } | |
1293 | + } | |
1294 | + | |
b752ccd1 | 1295 | + err = test_children_busy(sb->s_root, bindex, verbose); |
1facf9fc | 1296 | + if (unlikely(err)) { |
1297 | + if (do_wh) | |
1298 | + goto out_wh; | |
1299 | + goto out; | |
1300 | + } | |
1301 | + | |
1302 | + err = 0; | |
1303 | + br_id = br->br_id; | |
1304 | + if (!remount) | |
1305 | + au_br_do_del(sb, bindex, br); | |
1306 | + else { | |
1307 | + sysaufs_brs_del(sb, bindex); | |
1308 | + au_br_do_del(sb, bindex, br); | |
1309 | + sysaufs_brs_add(sb, bindex); | |
1310 | + } | |
1311 | + | |
1308ab2a | 1312 | + if (!bindex) { |
1facf9fc | 1313 | + au_cpup_attr_all(sb->s_root->d_inode, /*force*/1); |
1308ab2a | 1314 | + sb->s_maxbytes = au_sbr_sb(sb, 0)->s_maxbytes; |
1315 | + } else | |
1facf9fc | 1316 | + au_sub_nlink(sb->s_root->d_inode, del->h_path.dentry->d_inode); |
1317 | + if (au_opt_test(mnt_flags, PLINK)) | |
1318 | + au_plink_half_refresh(sb, br_id); | |
1319 | + | |
b752ccd1 | 1320 | + if (au_xino_brid(sb) == br_id) |
1facf9fc | 1321 | + au_xino_brid_set(sb, -1); |
1322 | + goto out; /* success */ | |
1323 | + | |
4f0767ce | 1324 | +out_wh: |
1facf9fc | 1325 | + /* revert */ |
1326 | + rerr = au_br_init_wh(sb, br, br->br_perm, del->h_path.dentry); | |
1327 | + if (rerr) | |
4a4d8108 AM |
1328 | + pr_warning("failed re-creating base whiteout, %s. (%d)\n", |
1329 | + del->pathname, rerr); | |
4f0767ce | 1330 | +out: |
1facf9fc | 1331 | + return err; |
1332 | +} | |
1333 | + | |
1334 | +/* ---------------------------------------------------------------------- */ | |
1335 | + | |
1336 | +/* | |
1337 | + * change a branch permission | |
1338 | + */ | |
1339 | + | |
dece6358 AM |
1340 | +static void au_warn_ima(void) |
1341 | +{ | |
1342 | +#ifdef CONFIG_IMA | |
1308ab2a | 1343 | + /* since it doesn't support mark_files_ro() */ |
953406b4 | 1344 | + pr_warning("RW -> RO makes IMA to produce wrong message"); |
dece6358 AM |
1345 | +#endif |
1346 | +} | |
1347 | + | |
1facf9fc | 1348 | +static int do_need_sigen_inc(int a, int b) |
1349 | +{ | |
1350 | + return au_br_whable(a) && !au_br_whable(b); | |
1351 | +} | |
1352 | + | |
1353 | +static int need_sigen_inc(int old, int new) | |
1354 | +{ | |
1355 | + return do_need_sigen_inc(old, new) | |
1356 | + || do_need_sigen_inc(new, old); | |
1357 | +} | |
1358 | + | |
1359 | +static int au_br_mod_files_ro(struct super_block *sb, aufs_bindex_t bindex) | |
1360 | +{ | |
1361 | + int err; | |
1362 | + unsigned long n, ul, bytes, files; | |
953406b4 | 1363 | + aufs_bindex_t bstart; |
1facf9fc | 1364 | + struct file *file, *hf, **a; |
1365 | + const int step_bytes = 1024, /* memory allocation unit */ | |
1366 | + step_files = step_bytes / sizeof(*a); | |
1367 | + | |
1368 | + err = -ENOMEM; | |
1369 | + n = 0; | |
1370 | + bytes = step_bytes; | |
1371 | + files = step_files; | |
1372 | + a = kmalloc(bytes, GFP_NOFS); | |
1373 | + if (unlikely(!a)) | |
1374 | + goto out; | |
1375 | + | |
1376 | + /* no need file_list_lock() since sbinfo is locked? defered? */ | |
1377 | + list_for_each_entry(file, &sb->s_files, f_u.fu_list) { | |
1378 | + if (special_file(file->f_dentry->d_inode->i_mode)) | |
1379 | + continue; | |
1380 | + | |
1381 | + AuDbg("%.*s\n", AuDLNPair(file->f_dentry)); | |
1382 | + fi_read_lock(file); | |
1383 | + if (unlikely(au_test_mmapped(file))) { | |
1384 | + err = -EBUSY; | |
1385 | + FiMustNoWaiters(file); | |
1386 | + fi_read_unlock(file); | |
1387 | + goto out_free; | |
1388 | + } | |
1389 | + | |
953406b4 AM |
1390 | + bstart = au_fbstart(file); |
1391 | + if (!S_ISREG(file->f_dentry->d_inode->i_mode) | |
1facf9fc | 1392 | + || !(file->f_mode & FMODE_WRITE) |
953406b4 | 1393 | + || bstart != bindex) { |
1facf9fc | 1394 | + FiMustNoWaiters(file); |
1395 | + fi_read_unlock(file); | |
1396 | + continue; | |
1397 | + } | |
1398 | + | |
953406b4 | 1399 | + hf = au_hf_top(file); |
1facf9fc | 1400 | + FiMustNoWaiters(file); |
1401 | + fi_read_unlock(file); | |
1402 | + | |
1403 | + if (n < files) | |
1404 | + a[n++] = hf; | |
1405 | + else { | |
1406 | + void *p; | |
1407 | + | |
1408 | + err = -ENOMEM; | |
1409 | + bytes += step_bytes; | |
1410 | + files += step_files; | |
1411 | + p = krealloc(a, bytes, GFP_NOFS); | |
1412 | + if (p) { | |
1413 | + a = p; | |
1414 | + a[n++] = hf; | |
1415 | + } else | |
1416 | + goto out_free; | |
1417 | + } | |
1418 | + } | |
1419 | + | |
1420 | + err = 0; | |
dece6358 AM |
1421 | + if (n) |
1422 | + au_warn_ima(); | |
1facf9fc | 1423 | + for (ul = 0; ul < n; ul++) { |
1424 | + /* todo: already flushed? */ | |
1425 | + /* cf. fs/super.c:mark_files_ro() */ | |
1426 | + hf = a[ul]; | |
1427 | + hf->f_mode &= ~FMODE_WRITE; | |
1428 | + if (!file_check_writeable(hf)) { | |
1429 | + file_release_write(hf); | |
1430 | + mnt_drop_write(hf->f_vfsmnt); | |
1431 | + } | |
1432 | + } | |
1433 | + | |
4f0767ce | 1434 | +out_free: |
1facf9fc | 1435 | + kfree(a); |
4f0767ce | 1436 | +out: |
1facf9fc | 1437 | + return err; |
1438 | +} | |
1439 | + | |
1440 | +int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount, | |
1441 | + int *do_update) | |
1442 | +{ | |
1443 | + int err, rerr; | |
1444 | + aufs_bindex_t bindex; | |
1308ab2a | 1445 | + struct path path; |
1facf9fc | 1446 | + struct dentry *root; |
1447 | + struct au_branch *br; | |
1448 | + | |
1449 | + root = sb->s_root; | |
953406b4 | 1450 | + au_plink_maint_block(sb); |
1facf9fc | 1451 | + bindex = au_find_dbindex(root, mod->h_root); |
1452 | + if (bindex < 0) { | |
1453 | + if (remount) | |
1454 | + return 0; /* success */ | |
1455 | + err = -ENOENT; | |
4a4d8108 | 1456 | + pr_err("%s no such branch\n", mod->path); |
1facf9fc | 1457 | + goto out; |
1458 | + } | |
1459 | + AuDbg("bindex b%d\n", bindex); | |
1460 | + | |
1461 | + err = test_br(mod->h_root->d_inode, mod->perm, mod->path); | |
1462 | + if (unlikely(err)) | |
1463 | + goto out; | |
1464 | + | |
1465 | + br = au_sbr(sb, bindex); | |
1466 | + if (br->br_perm == mod->perm) | |
1467 | + return 0; /* success */ | |
1468 | + | |
1469 | + if (au_br_writable(br->br_perm)) { | |
1470 | + /* remove whiteout base */ | |
1471 | + err = au_br_init_wh(sb, br, mod->perm, mod->h_root); | |
1472 | + if (unlikely(err)) | |
1473 | + goto out; | |
1474 | + | |
1475 | + if (!au_br_writable(mod->perm)) { | |
1476 | + /* rw --> ro, file might be mmapped */ | |
1477 | + DiMustNoWaiters(root); | |
1478 | + IiMustNoWaiters(root->d_inode); | |
1479 | + di_write_unlock(root); | |
1480 | + err = au_br_mod_files_ro(sb, bindex); | |
1481 | + /* aufs_write_lock() calls ..._child() */ | |
1482 | + di_write_lock_child(root); | |
1483 | + | |
1484 | + if (unlikely(err)) { | |
1485 | + rerr = -ENOMEM; | |
1486 | + br->br_wbr = kmalloc(sizeof(*br->br_wbr), | |
1487 | + GFP_NOFS); | |
1308ab2a | 1488 | + if (br->br_wbr) { |
1489 | + path.mnt = br->br_mnt; | |
1490 | + path.dentry = mod->h_root; | |
1491 | + rerr = au_wbr_init(br, sb, br->br_perm, | |
1492 | + &path); | |
1493 | + } | |
1facf9fc | 1494 | + if (unlikely(rerr)) { |
1495 | + AuIOErr("nested error %d (%d)\n", | |
1496 | + rerr, err); | |
1497 | + br->br_perm = mod->perm; | |
1498 | + } | |
1499 | + } | |
1500 | + } | |
1501 | + } else if (au_br_writable(mod->perm)) { | |
1502 | + /* ro --> rw */ | |
1503 | + err = -ENOMEM; | |
1504 | + br->br_wbr = kmalloc(sizeof(*br->br_wbr), GFP_NOFS); | |
1505 | + if (br->br_wbr) { | |
1308ab2a | 1506 | + path.mnt = br->br_mnt; |
1507 | + path.dentry = mod->h_root; | |
1facf9fc | 1508 | + err = au_wbr_init(br, sb, mod->perm, &path); |
1509 | + if (unlikely(err)) { | |
1510 | + kfree(br->br_wbr); | |
1511 | + br->br_wbr = NULL; | |
1512 | + } | |
1513 | + } | |
1514 | + } | |
1515 | + | |
1516 | + if (!err) { | |
1517 | + *do_update |= need_sigen_inc(br->br_perm, mod->perm); | |
1518 | + br->br_perm = mod->perm; | |
1519 | + } | |
1520 | + | |
4f0767ce | 1521 | +out: |
1facf9fc | 1522 | + return err; |
1523 | +} | |
b752ccd1 AM |
1524 | diff -urN /usr/share/empty/fs/aufs/branch.h linux/fs/aufs/branch.h |
1525 | --- /usr/share/empty/fs/aufs/branch.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 1526 | +++ linux/fs/aufs/branch.h 2010-10-21 09:52:43.086957936 +0200 |
b752ccd1 | 1527 | @@ -0,0 +1,224 @@ |
1facf9fc | 1528 | +/* |
4a4d8108 | 1529 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 1530 | + * |
1531 | + * This program, aufs is free software; you can redistribute it and/or modify | |
1532 | + * it under the terms of the GNU General Public License as published by | |
1533 | + * the Free Software Foundation; either version 2 of the License, or | |
1534 | + * (at your option) any later version. | |
dece6358 AM |
1535 | + * |
1536 | + * This program is distributed in the hope that it will be useful, | |
1537 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1538 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1539 | + * GNU General Public License for more details. | |
1540 | + * | |
1541 | + * You should have received a copy of the GNU General Public License | |
1542 | + * along with this program; if not, write to the Free Software | |
1543 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 1544 | + */ |
1545 | + | |
1546 | +/* | |
1547 | + * branch filesystems and xino for them | |
1548 | + */ | |
1549 | + | |
1550 | +#ifndef __AUFS_BRANCH_H__ | |
1551 | +#define __AUFS_BRANCH_H__ | |
1552 | + | |
1553 | +#ifdef __KERNEL__ | |
1554 | + | |
1555 | +#include <linux/fs.h> | |
1556 | +#include <linux/mount.h> | |
1facf9fc | 1557 | +#include <linux/aufs_type.h> |
4a4d8108 | 1558 | +#include "dynop.h" |
1facf9fc | 1559 | +#include "rwsem.h" |
1560 | +#include "super.h" | |
1561 | + | |
1562 | +/* ---------------------------------------------------------------------- */ | |
1563 | + | |
1564 | +/* a xino file */ | |
1565 | +struct au_xino_file { | |
1566 | + struct file *xi_file; | |
1567 | + struct mutex xi_nondir_mtx; | |
1568 | + | |
1569 | + /* todo: make xino files an array to support huge inode number */ | |
1570 | + | |
1571 | +#ifdef CONFIG_DEBUG_FS | |
1572 | + struct dentry *xi_dbgaufs; | |
1573 | +#endif | |
1574 | +}; | |
1575 | + | |
1576 | +/* members for writable branch only */ | |
1577 | +enum {AuBrWh_BASE, AuBrWh_PLINK, AuBrWh_ORPH, AuBrWh_Last}; | |
1578 | +struct au_wbr { | |
dece6358 | 1579 | + struct au_rwsem wbr_wh_rwsem; |
1facf9fc | 1580 | + struct dentry *wbr_wh[AuBrWh_Last]; |
4a4d8108 | 1581 | + atomic_t wbr_wh_running; |
1facf9fc | 1582 | +#define wbr_whbase wbr_wh[AuBrWh_BASE] /* whiteout base */ |
1583 | +#define wbr_plink wbr_wh[AuBrWh_PLINK] /* pseudo-link dir */ | |
1584 | +#define wbr_orph wbr_wh[AuBrWh_ORPH] /* dir for orphans */ | |
1585 | + | |
1586 | + /* mfs mode */ | |
1587 | + unsigned long long wbr_bytes; | |
1588 | +}; | |
1589 | + | |
4a4d8108 AM |
1590 | +/* ext2 has 3 types of operations at least, ext3 has 4 */ |
1591 | +#define AuBrDynOp (AuDyLast * 4) | |
1592 | + | |
1facf9fc | 1593 | +/* protected by superblock rwsem */ |
1594 | +struct au_branch { | |
1595 | + struct au_xino_file br_xino; | |
1596 | + | |
1597 | + aufs_bindex_t br_id; | |
1598 | + | |
1599 | + int br_perm; | |
1600 | + struct vfsmount *br_mnt; | |
4a4d8108 AM |
1601 | + spinlock_t br_dykey_lock; |
1602 | + struct au_dykey *br_dykey[AuBrDynOp]; | |
1facf9fc | 1603 | + atomic_t br_count; |
1604 | + | |
1605 | + struct au_wbr *br_wbr; | |
1606 | + | |
1607 | + /* xino truncation */ | |
1608 | + blkcnt_t br_xino_upper; /* watermark in blocks */ | |
1609 | + atomic_t br_xino_running; | |
1610 | + | |
1611 | +#ifdef CONFIG_SYSFS | |
1612 | + /* an entry under sysfs per mount-point */ | |
1613 | + char br_name[8]; | |
1614 | + struct attribute br_attr; | |
1615 | +#endif | |
1616 | +}; | |
1617 | + | |
1618 | +/* ---------------------------------------------------------------------- */ | |
1619 | + | |
1620 | +/* branch permission and attribute */ | |
1621 | +enum { | |
1622 | + AuBrPerm_RW, /* writable, linkable wh */ | |
1623 | + AuBrPerm_RO, /* readonly, no wh */ | |
1624 | + AuBrPerm_RR, /* natively readonly, no wh */ | |
1625 | + | |
1626 | + AuBrPerm_RWNoLinkWH, /* un-linkable whiteouts */ | |
1627 | + | |
1628 | + AuBrPerm_ROWH, /* whiteout-able */ | |
1629 | + AuBrPerm_RRWH, /* whiteout-able */ | |
1630 | + | |
1631 | + AuBrPerm_Last | |
1632 | +}; | |
1633 | + | |
1634 | +static inline int au_br_writable(int brperm) | |
1635 | +{ | |
1636 | + return brperm == AuBrPerm_RW || brperm == AuBrPerm_RWNoLinkWH; | |
1637 | +} | |
1638 | + | |
1639 | +static inline int au_br_whable(int brperm) | |
1640 | +{ | |
1641 | + return brperm == AuBrPerm_RW | |
1642 | + || brperm == AuBrPerm_ROWH | |
1643 | + || brperm == AuBrPerm_RRWH; | |
1644 | +} | |
1645 | + | |
1646 | +static inline int au_br_rdonly(struct au_branch *br) | |
1647 | +{ | |
1648 | + return ((br->br_mnt->mnt_sb->s_flags & MS_RDONLY) | |
1649 | + || !au_br_writable(br->br_perm)) | |
1650 | + ? -EROFS : 0; | |
1651 | +} | |
1652 | + | |
4a4d8108 | 1653 | +static inline int au_br_hnotifyable(int brperm __maybe_unused) |
1facf9fc | 1654 | +{ |
4a4d8108 | 1655 | +#ifdef CONFIG_AUFS_HNOTIFY |
1facf9fc | 1656 | + return brperm != AuBrPerm_RR && brperm != AuBrPerm_RRWH; |
1657 | +#else | |
1658 | + return 0; | |
1659 | +#endif | |
1660 | +} | |
1661 | + | |
1662 | +/* ---------------------------------------------------------------------- */ | |
1663 | + | |
1664 | +/* branch.c */ | |
1665 | +struct au_sbinfo; | |
1666 | +void au_br_free(struct au_sbinfo *sinfo); | |
1667 | +int au_br_index(struct super_block *sb, aufs_bindex_t br_id); | |
1668 | +struct au_opt_add; | |
1669 | +int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount); | |
1670 | +struct au_opt_del; | |
1671 | +int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount); | |
1672 | +struct au_opt_mod; | |
1673 | +int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount, | |
1674 | + int *do_update); | |
1675 | + | |
1676 | +/* xino.c */ | |
1677 | +static const loff_t au_loff_max = LLONG_MAX; | |
1678 | + | |
1679 | +int au_xib_trunc(struct super_block *sb); | |
1680 | +ssize_t xino_fread(au_readf_t func, struct file *file, void *buf, size_t size, | |
1681 | + loff_t *pos); | |
1682 | +ssize_t xino_fwrite(au_writef_t func, struct file *file, void *buf, size_t size, | |
1683 | + loff_t *pos); | |
1684 | +struct file *au_xino_create2(struct file *base_file, struct file *copy_src); | |
1685 | +struct file *au_xino_create(struct super_block *sb, char *fname, int silent); | |
1686 | +ino_t au_xino_new_ino(struct super_block *sb); | |
b752ccd1 | 1687 | +void au_xino_delete_inode(struct inode *inode, const int unlinked); |
1facf9fc | 1688 | +int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, |
1689 | + ino_t ino); | |
1690 | +int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
1691 | + ino_t *ino); | |
1692 | +int au_xino_br(struct super_block *sb, struct au_branch *br, ino_t hino, | |
1693 | + struct file *base_file, int do_test); | |
1694 | +int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex); | |
1695 | + | |
1696 | +struct au_opt_xino; | |
1697 | +int au_xino_set(struct super_block *sb, struct au_opt_xino *xino, int remount); | |
1698 | +void au_xino_clr(struct super_block *sb); | |
1699 | +struct file *au_xino_def(struct super_block *sb); | |
1700 | +int au_xino_path(struct seq_file *seq, struct file *file); | |
1701 | + | |
1702 | +/* ---------------------------------------------------------------------- */ | |
1703 | + | |
1704 | +/* Superblock to branch */ | |
1705 | +static inline | |
1706 | +aufs_bindex_t au_sbr_id(struct super_block *sb, aufs_bindex_t bindex) | |
1707 | +{ | |
1708 | + return au_sbr(sb, bindex)->br_id; | |
1709 | +} | |
1710 | + | |
1711 | +static inline | |
1712 | +struct vfsmount *au_sbr_mnt(struct super_block *sb, aufs_bindex_t bindex) | |
1713 | +{ | |
1714 | + return au_sbr(sb, bindex)->br_mnt; | |
1715 | +} | |
1716 | + | |
1717 | +static inline | |
1718 | +struct super_block *au_sbr_sb(struct super_block *sb, aufs_bindex_t bindex) | |
1719 | +{ | |
1720 | + return au_sbr_mnt(sb, bindex)->mnt_sb; | |
1721 | +} | |
1722 | + | |
1723 | +static inline void au_sbr_put(struct super_block *sb, aufs_bindex_t bindex) | |
1724 | +{ | |
953406b4 | 1725 | + atomic_dec_return(&au_sbr(sb, bindex)->br_count); |
1facf9fc | 1726 | +} |
1727 | + | |
1728 | +static inline int au_sbr_perm(struct super_block *sb, aufs_bindex_t bindex) | |
1729 | +{ | |
1730 | + return au_sbr(sb, bindex)->br_perm; | |
1731 | +} | |
1732 | + | |
1733 | +static inline int au_sbr_whable(struct super_block *sb, aufs_bindex_t bindex) | |
1734 | +{ | |
1735 | + return au_br_whable(au_sbr_perm(sb, bindex)); | |
1736 | +} | |
1737 | + | |
1738 | +/* ---------------------------------------------------------------------- */ | |
1739 | + | |
1740 | +/* | |
1741 | + * wbr_wh_read_lock, wbr_wh_write_lock | |
1742 | + * wbr_wh_read_unlock, wbr_wh_write_unlock, wbr_wh_downgrade_lock | |
1743 | + */ | |
1744 | +AuSimpleRwsemFuncs(wbr_wh, struct au_wbr *wbr, &wbr->wbr_wh_rwsem); | |
1745 | + | |
dece6358 AM |
1746 | +#define WbrWhMustNoWaiters(wbr) AuRwMustNoWaiters(&wbr->wbr_wh_rwsem) |
1747 | +#define WbrWhMustAnyLock(wbr) AuRwMustAnyLock(&wbr->wbr_wh_rwsem) | |
1748 | +#define WbrWhMustWriteLock(wbr) AuRwMustWriteLock(&wbr->wbr_wh_rwsem) | |
1749 | + | |
1facf9fc | 1750 | +#endif /* __KERNEL__ */ |
1751 | +#endif /* __AUFS_BRANCH_H__ */ | |
b752ccd1 AM |
1752 | diff -urN /usr/share/empty/fs/aufs/conf.mk linux/fs/aufs/conf.mk |
1753 | --- /usr/share/empty/fs/aufs/conf.mk 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
1754 | +++ linux/fs/aufs/conf.mk 2010-10-21 09:52:43.086957936 +0200 |
1755 | @@ -0,0 +1,36 @@ | |
4a4d8108 AM |
1756 | + |
1757 | +AuConfStr = CONFIG_AUFS_FS=${CONFIG_AUFS_FS} | |
1758 | + | |
1759 | +define AuConf | |
1760 | +ifdef ${1} | |
1761 | +AuConfStr += ${1}=${${1}} | |
1762 | +endif | |
1763 | +endef | |
1764 | + | |
b752ccd1 | 1765 | +AuConfAll = BRANCH_MAX_127 BRANCH_MAX_511 BRANCH_MAX_1023 BRANCH_MAX_32767 \ |
953406b4 | 1766 | + HNOTIFY HFSNOTIFY \ |
4a4d8108 AM |
1767 | + EXPORT INO_T_64 \ |
1768 | + RDU \ | |
1769 | + SP_IATTR \ | |
1770 | + SHWH \ | |
1771 | + BR_RAMFS \ | |
1772 | + BR_FUSE POLL \ | |
1773 | + BR_HFSPLUS \ | |
1774 | + BDEV_LOOP \ | |
b752ccd1 AM |
1775 | + DEBUG MAGIC_SYSRQ |
1776 | +$(foreach i, ${AuConfAll}, \ | |
4a4d8108 AM |
1777 | + $(eval $(call AuConf,CONFIG_AUFS_${i}))) |
1778 | + | |
1779 | +AuConfName = ${obj}/conf.str | |
1780 | +${AuConfName}.tmp: FORCE | |
1781 | + @echo ${AuConfStr} | tr ' ' '\n' | sed -e 's/^/"/' -e 's/$$/\\n"/' > $@ | |
1782 | +${AuConfName}: ${AuConfName}.tmp | |
1783 | + @diff -q $< $@ > /dev/null 2>&1 || { \ | |
1784 | + echo ' GEN ' $@; \ | |
1785 | + cp -p $< $@; \ | |
1786 | + } | |
1787 | +FORCE: | |
1788 | +clean-files += ${AuConfName} ${AuConfName}.tmp | |
1789 | +${obj}/sysfs.o: ${AuConfName} | |
b752ccd1 AM |
1790 | + |
1791 | +-include ${srctree}/${src}/conf_priv.mk | |
1792 | diff -urN /usr/share/empty/fs/aufs/cpup.c linux/fs/aufs/cpup.c | |
1793 | --- /usr/share/empty/fs/aufs/cpup.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 1794 | +++ linux/fs/aufs/cpup.c 2010-10-21 09:52:43.086957936 +0200 |
b752ccd1 | 1795 | @@ -0,0 +1,1059 @@ |
1facf9fc | 1796 | +/* |
4a4d8108 | 1797 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 1798 | + * |
1799 | + * This program, aufs is free software; you can redistribute it and/or modify | |
1800 | + * it under the terms of the GNU General Public License as published by | |
1801 | + * the Free Software Foundation; either version 2 of the License, or | |
1802 | + * (at your option) any later version. | |
dece6358 AM |
1803 | + * |
1804 | + * This program is distributed in the hope that it will be useful, | |
1805 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1806 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1807 | + * GNU General Public License for more details. | |
1808 | + * | |
1809 | + * You should have received a copy of the GNU General Public License | |
1810 | + * along with this program; if not, write to the Free Software | |
1811 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 1812 | + */ |
1813 | + | |
1814 | +/* | |
1815 | + * copy-up functions, see wbr_policy.c for copy-down | |
1816 | + */ | |
1817 | + | |
dece6358 | 1818 | +#include <linux/file.h> |
1facf9fc | 1819 | +#include <linux/fs_stack.h> |
dece6358 | 1820 | +#include <linux/mm.h> |
1facf9fc | 1821 | +#include <linux/uaccess.h> |
1822 | +#include "aufs.h" | |
1823 | + | |
1824 | +void au_cpup_attr_flags(struct inode *dst, struct inode *src) | |
1825 | +{ | |
1826 | + const unsigned int mask = S_DEAD | S_SWAPFILE | S_PRIVATE | |
1827 | + | S_NOATIME | S_NOCMTIME; | |
1828 | + | |
1829 | + dst->i_flags |= src->i_flags & ~mask; | |
1830 | + if (au_test_fs_notime(dst->i_sb)) | |
1831 | + dst->i_flags |= S_NOATIME | S_NOCMTIME; | |
1832 | +} | |
1833 | + | |
1834 | +void au_cpup_attr_timesizes(struct inode *inode) | |
1835 | +{ | |
1836 | + struct inode *h_inode; | |
1837 | + | |
1838 | + h_inode = au_h_iptr(inode, au_ibstart(inode)); | |
1839 | + fsstack_copy_attr_times(inode, h_inode); | |
4a4d8108 | 1840 | + fsstack_copy_inode_size(inode, h_inode); |
1facf9fc | 1841 | +} |
1842 | + | |
1843 | +void au_cpup_attr_nlink(struct inode *inode, int force) | |
1844 | +{ | |
1845 | + struct inode *h_inode; | |
1846 | + struct super_block *sb; | |
1847 | + aufs_bindex_t bindex, bend; | |
1848 | + | |
1849 | + sb = inode->i_sb; | |
1850 | + bindex = au_ibstart(inode); | |
1851 | + h_inode = au_h_iptr(inode, bindex); | |
1852 | + if (!force | |
1853 | + && !S_ISDIR(h_inode->i_mode) | |
1854 | + && au_opt_test(au_mntflags(sb), PLINK) | |
1855 | + && au_plink_test(inode)) | |
1856 | + return; | |
1857 | + | |
1858 | + inode->i_nlink = h_inode->i_nlink; | |
1859 | + | |
1860 | + /* | |
1861 | + * fewer nlink makes find(1) noisy, but larger nlink doesn't. | |
1862 | + * it may includes whplink directory. | |
1863 | + */ | |
1864 | + if (S_ISDIR(h_inode->i_mode)) { | |
1865 | + bend = au_ibend(inode); | |
1866 | + for (bindex++; bindex <= bend; bindex++) { | |
1867 | + h_inode = au_h_iptr(inode, bindex); | |
1868 | + if (h_inode) | |
1869 | + au_add_nlink(inode, h_inode); | |
1870 | + } | |
1871 | + } | |
1872 | +} | |
1873 | + | |
1874 | +void au_cpup_attr_changeable(struct inode *inode) | |
1875 | +{ | |
1876 | + struct inode *h_inode; | |
1877 | + | |
1878 | + h_inode = au_h_iptr(inode, au_ibstart(inode)); | |
1879 | + inode->i_mode = h_inode->i_mode; | |
1880 | + inode->i_uid = h_inode->i_uid; | |
1881 | + inode->i_gid = h_inode->i_gid; | |
1882 | + au_cpup_attr_timesizes(inode); | |
1883 | + au_cpup_attr_flags(inode, h_inode); | |
1884 | +} | |
1885 | + | |
1886 | +void au_cpup_igen(struct inode *inode, struct inode *h_inode) | |
1887 | +{ | |
1888 | + struct au_iinfo *iinfo = au_ii(inode); | |
1889 | + | |
1308ab2a | 1890 | + IiMustWriteLock(inode); |
1891 | + | |
1facf9fc | 1892 | + iinfo->ii_higen = h_inode->i_generation; |
1893 | + iinfo->ii_hsb1 = h_inode->i_sb; | |
1894 | +} | |
1895 | + | |
1896 | +void au_cpup_attr_all(struct inode *inode, int force) | |
1897 | +{ | |
1898 | + struct inode *h_inode; | |
1899 | + | |
1900 | + h_inode = au_h_iptr(inode, au_ibstart(inode)); | |
1901 | + au_cpup_attr_changeable(inode); | |
1902 | + if (inode->i_nlink > 0) | |
1903 | + au_cpup_attr_nlink(inode, force); | |
1904 | + inode->i_rdev = h_inode->i_rdev; | |
1905 | + inode->i_blkbits = h_inode->i_blkbits; | |
1906 | + au_cpup_igen(inode, h_inode); | |
1907 | +} | |
1908 | + | |
1909 | +/* ---------------------------------------------------------------------- */ | |
1910 | + | |
1911 | +/* Note: dt_dentry and dt_h_dentry are not dget/dput-ed */ | |
1912 | + | |
1913 | +/* keep the timestamps of the parent dir when cpup */ | |
1914 | +void au_dtime_store(struct au_dtime *dt, struct dentry *dentry, | |
1915 | + struct path *h_path) | |
1916 | +{ | |
1917 | + struct inode *h_inode; | |
1918 | + | |
1919 | + dt->dt_dentry = dentry; | |
1920 | + dt->dt_h_path = *h_path; | |
1921 | + h_inode = h_path->dentry->d_inode; | |
1922 | + dt->dt_atime = h_inode->i_atime; | |
1923 | + dt->dt_mtime = h_inode->i_mtime; | |
1924 | + /* smp_mb(); */ | |
1925 | +} | |
1926 | + | |
1927 | +void au_dtime_revert(struct au_dtime *dt) | |
1928 | +{ | |
1929 | + struct iattr attr; | |
1930 | + int err; | |
1931 | + | |
1932 | + attr.ia_atime = dt->dt_atime; | |
1933 | + attr.ia_mtime = dt->dt_mtime; | |
1934 | + attr.ia_valid = ATTR_FORCE | ATTR_MTIME | ATTR_MTIME_SET | |
1935 | + | ATTR_ATIME | ATTR_ATIME_SET; | |
1936 | + | |
1937 | + err = vfsub_notify_change(&dt->dt_h_path, &attr); | |
1938 | + if (unlikely(err)) | |
4a4d8108 | 1939 | + pr_warning("restoring timestamps failed(%d). ignored\n", err); |
1facf9fc | 1940 | +} |
1941 | + | |
1942 | +/* ---------------------------------------------------------------------- */ | |
1943 | + | |
1944 | +static noinline_for_stack | |
1945 | +int cpup_iattr(struct dentry *dst, aufs_bindex_t bindex, struct dentry *h_src) | |
1946 | +{ | |
1947 | + int err, sbits; | |
1948 | + struct iattr ia; | |
1949 | + struct path h_path; | |
1308ab2a | 1950 | + struct inode *h_isrc, *h_idst; |
1facf9fc | 1951 | + |
1952 | + h_path.dentry = au_h_dptr(dst, bindex); | |
1308ab2a | 1953 | + h_idst = h_path.dentry->d_inode; |
1facf9fc | 1954 | + h_path.mnt = au_sbr_mnt(dst->d_sb, bindex); |
1955 | + h_isrc = h_src->d_inode; | |
1308ab2a | 1956 | + ia.ia_valid = ATTR_FORCE | ATTR_UID | ATTR_GID |
1facf9fc | 1957 | + | ATTR_ATIME | ATTR_MTIME |
1958 | + | ATTR_ATIME_SET | ATTR_MTIME_SET; | |
1facf9fc | 1959 | + ia.ia_uid = h_isrc->i_uid; |
1960 | + ia.ia_gid = h_isrc->i_gid; | |
1961 | + ia.ia_atime = h_isrc->i_atime; | |
1962 | + ia.ia_mtime = h_isrc->i_mtime; | |
1308ab2a | 1963 | + if (h_idst->i_mode != h_isrc->i_mode |
1964 | + && !S_ISLNK(h_idst->i_mode)) { | |
1965 | + ia.ia_valid |= ATTR_MODE; | |
1966 | + ia.ia_mode = h_isrc->i_mode; | |
1967 | + } | |
1968 | + sbits = !!(h_isrc->i_mode & (S_ISUID | S_ISGID)); | |
1969 | + au_cpup_attr_flags(h_idst, h_isrc); | |
1facf9fc | 1970 | + err = vfsub_notify_change(&h_path, &ia); |
1971 | + | |
1972 | + /* is this nfs only? */ | |
1973 | + if (!err && sbits && au_test_nfs(h_path.dentry->d_sb)) { | |
1974 | + ia.ia_valid = ATTR_FORCE | ATTR_MODE; | |
1975 | + ia.ia_mode = h_isrc->i_mode; | |
1976 | + err = vfsub_notify_change(&h_path, &ia); | |
1977 | + } | |
1978 | + | |
1979 | + return err; | |
1980 | +} | |
1981 | + | |
1982 | +/* ---------------------------------------------------------------------- */ | |
1983 | + | |
1984 | +static int au_do_copy_file(struct file *dst, struct file *src, loff_t len, | |
1985 | + char *buf, unsigned long blksize) | |
1986 | +{ | |
1987 | + int err; | |
1988 | + size_t sz, rbytes, wbytes; | |
1989 | + unsigned char all_zero; | |
1990 | + char *p, *zp; | |
1991 | + struct mutex *h_mtx; | |
1992 | + /* reduce stack usage */ | |
1993 | + struct iattr *ia; | |
1994 | + | |
1995 | + zp = page_address(ZERO_PAGE(0)); | |
1996 | + if (unlikely(!zp)) | |
1997 | + return -ENOMEM; /* possible? */ | |
1998 | + | |
1999 | + err = 0; | |
2000 | + all_zero = 0; | |
2001 | + while (len) { | |
2002 | + AuDbg("len %lld\n", len); | |
2003 | + sz = blksize; | |
2004 | + if (len < blksize) | |
2005 | + sz = len; | |
2006 | + | |
2007 | + rbytes = 0; | |
2008 | + /* todo: signal_pending? */ | |
2009 | + while (!rbytes || err == -EAGAIN || err == -EINTR) { | |
2010 | + rbytes = vfsub_read_k(src, buf, sz, &src->f_pos); | |
2011 | + err = rbytes; | |
2012 | + } | |
2013 | + if (unlikely(err < 0)) | |
2014 | + break; | |
2015 | + | |
2016 | + all_zero = 0; | |
2017 | + if (len >= rbytes && rbytes == blksize) | |
2018 | + all_zero = !memcmp(buf, zp, rbytes); | |
2019 | + if (!all_zero) { | |
2020 | + wbytes = rbytes; | |
2021 | + p = buf; | |
2022 | + while (wbytes) { | |
2023 | + size_t b; | |
2024 | + | |
2025 | + b = vfsub_write_k(dst, p, wbytes, &dst->f_pos); | |
2026 | + err = b; | |
2027 | + /* todo: signal_pending? */ | |
2028 | + if (unlikely(err == -EAGAIN || err == -EINTR)) | |
2029 | + continue; | |
2030 | + if (unlikely(err < 0)) | |
2031 | + break; | |
2032 | + wbytes -= b; | |
2033 | + p += b; | |
2034 | + } | |
2035 | + } else { | |
2036 | + loff_t res; | |
2037 | + | |
2038 | + AuLabel(hole); | |
2039 | + res = vfsub_llseek(dst, rbytes, SEEK_CUR); | |
2040 | + err = res; | |
2041 | + if (unlikely(res < 0)) | |
2042 | + break; | |
2043 | + } | |
2044 | + len -= rbytes; | |
2045 | + err = 0; | |
2046 | + } | |
2047 | + | |
2048 | + /* the last block may be a hole */ | |
2049 | + if (!err && all_zero) { | |
2050 | + AuLabel(last hole); | |
2051 | + | |
2052 | + err = 1; | |
2053 | + if (au_test_nfs(dst->f_dentry->d_sb)) { | |
2054 | + /* nfs requires this step to make last hole */ | |
2055 | + /* is this only nfs? */ | |
2056 | + do { | |
2057 | + /* todo: signal_pending? */ | |
2058 | + err = vfsub_write_k(dst, "\0", 1, &dst->f_pos); | |
2059 | + } while (err == -EAGAIN || err == -EINTR); | |
2060 | + if (err == 1) | |
2061 | + dst->f_pos--; | |
2062 | + } | |
2063 | + | |
2064 | + if (err == 1) { | |
2065 | + ia = (void *)buf; | |
2066 | + ia->ia_size = dst->f_pos; | |
2067 | + ia->ia_valid = ATTR_SIZE | ATTR_FILE; | |
2068 | + ia->ia_file = dst; | |
2069 | + h_mtx = &dst->f_dentry->d_inode->i_mutex; | |
2070 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD2); | |
2071 | + err = vfsub_notify_change(&dst->f_path, ia); | |
2072 | + mutex_unlock(h_mtx); | |
2073 | + } | |
2074 | + } | |
2075 | + | |
2076 | + return err; | |
2077 | +} | |
2078 | + | |
2079 | +int au_copy_file(struct file *dst, struct file *src, loff_t len) | |
2080 | +{ | |
2081 | + int err; | |
2082 | + unsigned long blksize; | |
2083 | + unsigned char do_kfree; | |
2084 | + char *buf; | |
2085 | + | |
2086 | + err = -ENOMEM; | |
2087 | + blksize = dst->f_dentry->d_sb->s_blocksize; | |
2088 | + if (!blksize || PAGE_SIZE < blksize) | |
2089 | + blksize = PAGE_SIZE; | |
2090 | + AuDbg("blksize %lu\n", blksize); | |
2091 | + do_kfree = (blksize != PAGE_SIZE && blksize >= sizeof(struct iattr *)); | |
2092 | + if (do_kfree) | |
2093 | + buf = kmalloc(blksize, GFP_NOFS); | |
2094 | + else | |
2095 | + buf = (void *)__get_free_page(GFP_NOFS); | |
2096 | + if (unlikely(!buf)) | |
2097 | + goto out; | |
2098 | + | |
2099 | + if (len > (1 << 22)) | |
2100 | + AuDbg("copying a large file %lld\n", (long long)len); | |
2101 | + | |
2102 | + src->f_pos = 0; | |
2103 | + dst->f_pos = 0; | |
2104 | + err = au_do_copy_file(dst, src, len, buf, blksize); | |
2105 | + if (do_kfree) | |
2106 | + kfree(buf); | |
2107 | + else | |
2108 | + free_page((unsigned long)buf); | |
2109 | + | |
4f0767ce | 2110 | +out: |
1facf9fc | 2111 | + return err; |
2112 | +} | |
2113 | + | |
2114 | +/* | |
2115 | + * to support a sparse file which is opened with O_APPEND, | |
2116 | + * we need to close the file. | |
2117 | + */ | |
2118 | +static int au_cp_regular(struct dentry *dentry, aufs_bindex_t bdst, | |
4a4d8108 | 2119 | + aufs_bindex_t bsrc, loff_t len) |
1facf9fc | 2120 | +{ |
2121 | + int err, i; | |
2122 | + enum { SRC, DST }; | |
2123 | + struct { | |
2124 | + aufs_bindex_t bindex; | |
2125 | + unsigned int flags; | |
2126 | + struct dentry *dentry; | |
2127 | + struct file *file; | |
2128 | + void *label, *label_file; | |
2129 | + } *f, file[] = { | |
2130 | + { | |
2131 | + .bindex = bsrc, | |
2132 | + .flags = O_RDONLY | O_NOATIME | O_LARGEFILE, | |
2133 | + .file = NULL, | |
2134 | + .label = &&out, | |
2135 | + .label_file = &&out_src | |
2136 | + }, | |
2137 | + { | |
2138 | + .bindex = bdst, | |
2139 | + .flags = O_WRONLY | O_NOATIME | O_LARGEFILE, | |
2140 | + .file = NULL, | |
2141 | + .label = &&out_src, | |
2142 | + .label_file = &&out_dst | |
2143 | + } | |
2144 | + }; | |
2145 | + struct super_block *sb; | |
2146 | + | |
2147 | + /* bsrc branch can be ro/rw. */ | |
2148 | + sb = dentry->d_sb; | |
2149 | + f = file; | |
2150 | + for (i = 0; i < 2; i++, f++) { | |
2151 | + f->dentry = au_h_dptr(dentry, f->bindex); | |
2152 | + f->file = au_h_open(dentry, f->bindex, f->flags, /*file*/NULL); | |
2153 | + err = PTR_ERR(f->file); | |
2154 | + if (IS_ERR(f->file)) | |
2155 | + goto *f->label; | |
2156 | + err = -EINVAL; | |
2157 | + if (unlikely(!f->file->f_op)) | |
2158 | + goto *f->label_file; | |
2159 | + } | |
2160 | + | |
2161 | + /* try stopping to update while we copyup */ | |
2162 | + IMustLock(file[SRC].dentry->d_inode); | |
2163 | + err = au_copy_file(file[DST].file, file[SRC].file, len); | |
2164 | + | |
4f0767ce | 2165 | +out_dst: |
1facf9fc | 2166 | + fput(file[DST].file); |
2167 | + au_sbr_put(sb, file[DST].bindex); | |
4f0767ce | 2168 | +out_src: |
1facf9fc | 2169 | + fput(file[SRC].file); |
2170 | + au_sbr_put(sb, file[SRC].bindex); | |
4f0767ce | 2171 | +out: |
1facf9fc | 2172 | + return err; |
2173 | +} | |
2174 | + | |
2175 | +static int au_do_cpup_regular(struct dentry *dentry, aufs_bindex_t bdst, | |
2176 | + aufs_bindex_t bsrc, loff_t len, | |
2177 | + struct inode *h_dir, struct path *h_path) | |
2178 | +{ | |
2179 | + int err, rerr; | |
2180 | + loff_t l; | |
2181 | + | |
2182 | + err = 0; | |
2183 | + l = i_size_read(au_h_iptr(dentry->d_inode, bsrc)); | |
2184 | + if (len == -1 || l < len) | |
2185 | + len = l; | |
2186 | + if (len) | |
2187 | + err = au_cp_regular(dentry, bdst, bsrc, len); | |
2188 | + if (!err) | |
2189 | + goto out; /* success */ | |
2190 | + | |
2191 | + rerr = vfsub_unlink(h_dir, h_path, /*force*/0); | |
2192 | + if (rerr) { | |
2193 | + AuIOErr("failed unlinking cpup-ed %.*s(%d, %d)\n", | |
2194 | + AuDLNPair(h_path->dentry), err, rerr); | |
2195 | + err = -EIO; | |
2196 | + } | |
2197 | + | |
4f0767ce | 2198 | +out: |
1facf9fc | 2199 | + return err; |
2200 | +} | |
2201 | + | |
2202 | +static int au_do_cpup_symlink(struct path *h_path, struct dentry *h_src, | |
2203 | + struct inode *h_dir) | |
2204 | +{ | |
2205 | + int err, symlen; | |
2206 | + mm_segment_t old_fs; | |
b752ccd1 AM |
2207 | + union { |
2208 | + char *k; | |
2209 | + char __user *u; | |
2210 | + } sym; | |
1facf9fc | 2211 | + |
2212 | + err = -ENOSYS; | |
2213 | + if (unlikely(!h_src->d_inode->i_op->readlink)) | |
2214 | + goto out; | |
2215 | + | |
2216 | + err = -ENOMEM; | |
b752ccd1 AM |
2217 | + sym.k = __getname_gfp(GFP_NOFS); |
2218 | + if (unlikely(!sym.k)) | |
1facf9fc | 2219 | + goto out; |
2220 | + | |
2221 | + old_fs = get_fs(); | |
2222 | + set_fs(KERNEL_DS); | |
b752ccd1 | 2223 | + symlen = h_src->d_inode->i_op->readlink(h_src, sym.u, PATH_MAX); |
1facf9fc | 2224 | + err = symlen; |
2225 | + set_fs(old_fs); | |
2226 | + | |
2227 | + if (symlen > 0) { | |
b752ccd1 AM |
2228 | + sym.k[symlen] = 0; |
2229 | + err = vfsub_symlink(h_dir, h_path, sym.k); | |
1facf9fc | 2230 | + } |
b752ccd1 | 2231 | + __putname(sym.k); |
1facf9fc | 2232 | + |
4f0767ce | 2233 | +out: |
1facf9fc | 2234 | + return err; |
2235 | +} | |
2236 | + | |
2237 | +/* return with the lower dst inode is locked */ | |
2238 | +static noinline_for_stack | |
2239 | +int cpup_entry(struct dentry *dentry, aufs_bindex_t bdst, | |
2240 | + aufs_bindex_t bsrc, loff_t len, unsigned int flags, | |
2241 | + struct dentry *dst_parent) | |
2242 | +{ | |
2243 | + int err; | |
2244 | + umode_t mode; | |
2245 | + unsigned int mnt_flags; | |
2246 | + unsigned char isdir; | |
2247 | + const unsigned char do_dt = !!au_ftest_cpup(flags, DTIME); | |
2248 | + struct au_dtime dt; | |
2249 | + struct path h_path; | |
2250 | + struct dentry *h_src, *h_dst, *h_parent; | |
2251 | + struct inode *h_inode, *h_dir; | |
2252 | + struct super_block *sb; | |
2253 | + | |
2254 | + /* bsrc branch can be ro/rw. */ | |
2255 | + h_src = au_h_dptr(dentry, bsrc); | |
2256 | + h_inode = h_src->d_inode; | |
2257 | + AuDebugOn(h_inode != au_h_iptr(dentry->d_inode, bsrc)); | |
2258 | + | |
2259 | + /* try stopping to be referenced while we are creating */ | |
2260 | + h_dst = au_h_dptr(dentry, bdst); | |
2261 | + h_parent = h_dst->d_parent; /* dir inode is locked */ | |
2262 | + h_dir = h_parent->d_inode; | |
2263 | + IMustLock(h_dir); | |
2264 | + AuDebugOn(h_parent != h_dst->d_parent); | |
2265 | + | |
2266 | + sb = dentry->d_sb; | |
2267 | + h_path.mnt = au_sbr_mnt(sb, bdst); | |
2268 | + if (do_dt) { | |
2269 | + h_path.dentry = h_parent; | |
2270 | + au_dtime_store(&dt, dst_parent, &h_path); | |
2271 | + } | |
2272 | + h_path.dentry = h_dst; | |
2273 | + | |
2274 | + isdir = 0; | |
2275 | + mode = h_inode->i_mode; | |
2276 | + switch (mode & S_IFMT) { | |
2277 | + case S_IFREG: | |
2278 | + /* try stopping to update while we are referencing */ | |
2279 | + IMustLock(h_inode); | |
2280 | + err = vfsub_create(h_dir, &h_path, mode | S_IWUSR); | |
2281 | + if (!err) | |
2282 | + err = au_do_cpup_regular | |
2283 | + (dentry, bdst, bsrc, len, | |
2284 | + au_h_iptr(dst_parent->d_inode, bdst), &h_path); | |
2285 | + break; | |
2286 | + case S_IFDIR: | |
2287 | + isdir = 1; | |
2288 | + err = vfsub_mkdir(h_dir, &h_path, mode); | |
2289 | + if (!err) { | |
2290 | + /* | |
2291 | + * strange behaviour from the users view, | |
2292 | + * particularry setattr case | |
2293 | + */ | |
2294 | + if (au_ibstart(dst_parent->d_inode) == bdst) | |
2295 | + au_cpup_attr_nlink(dst_parent->d_inode, | |
2296 | + /*force*/1); | |
2297 | + au_cpup_attr_nlink(dentry->d_inode, /*force*/1); | |
2298 | + } | |
2299 | + break; | |
2300 | + case S_IFLNK: | |
2301 | + err = au_do_cpup_symlink(&h_path, h_src, h_dir); | |
2302 | + break; | |
2303 | + case S_IFCHR: | |
2304 | + case S_IFBLK: | |
2305 | + AuDebugOn(!capable(CAP_MKNOD)); | |
2306 | + /*FALLTHROUGH*/ | |
2307 | + case S_IFIFO: | |
2308 | + case S_IFSOCK: | |
2309 | + err = vfsub_mknod(h_dir, &h_path, mode, h_inode->i_rdev); | |
2310 | + break; | |
2311 | + default: | |
2312 | + AuIOErr("Unknown inode type 0%o\n", mode); | |
2313 | + err = -EIO; | |
2314 | + } | |
2315 | + | |
2316 | + mnt_flags = au_mntflags(sb); | |
2317 | + if (!au_opt_test(mnt_flags, UDBA_NONE) | |
2318 | + && !isdir | |
2319 | + && au_opt_test(mnt_flags, XINO) | |
2320 | + && h_inode->i_nlink == 1 | |
2321 | + /* todo: unnecessary? */ | |
2322 | + /* && dentry->d_inode->i_nlink == 1 */ | |
2323 | + && bdst < bsrc | |
2324 | + && !au_ftest_cpup(flags, KEEPLINO)) | |
1308ab2a | 2325 | + au_xino_write(sb, bsrc, h_inode->i_ino, /*ino*/0); |
1facf9fc | 2326 | + /* ignore this error */ |
2327 | + | |
2328 | + if (do_dt) | |
2329 | + au_dtime_revert(&dt); | |
2330 | + return err; | |
2331 | +} | |
2332 | + | |
2333 | +/* | |
2334 | + * copyup the @dentry from @bsrc to @bdst. | |
2335 | + * the caller must set the both of lower dentries. | |
2336 | + * @len is for truncating when it is -1 copyup the entire file. | |
2337 | + * in link/rename cases, @dst_parent may be different from the real one. | |
2338 | + */ | |
2339 | +static int au_cpup_single(struct dentry *dentry, aufs_bindex_t bdst, | |
2340 | + aufs_bindex_t bsrc, loff_t len, unsigned int flags, | |
2341 | + struct dentry *dst_parent) | |
2342 | +{ | |
2343 | + int err, rerr; | |
2344 | + aufs_bindex_t old_ibstart; | |
2345 | + unsigned char isdir, plink; | |
2346 | + struct au_dtime dt; | |
2347 | + struct path h_path; | |
2348 | + struct dentry *h_src, *h_dst, *h_parent; | |
2349 | + struct inode *dst_inode, *h_dir, *inode; | |
2350 | + struct super_block *sb; | |
2351 | + | |
2352 | + AuDebugOn(bsrc <= bdst); | |
2353 | + | |
2354 | + sb = dentry->d_sb; | |
2355 | + h_path.mnt = au_sbr_mnt(sb, bdst); | |
2356 | + h_dst = au_h_dptr(dentry, bdst); | |
2357 | + h_parent = h_dst->d_parent; /* dir inode is locked */ | |
2358 | + h_dir = h_parent->d_inode; | |
2359 | + IMustLock(h_dir); | |
2360 | + | |
2361 | + h_src = au_h_dptr(dentry, bsrc); | |
2362 | + inode = dentry->d_inode; | |
2363 | + | |
2364 | + if (!dst_parent) | |
2365 | + dst_parent = dget_parent(dentry); | |
2366 | + else | |
2367 | + dget(dst_parent); | |
2368 | + | |
2369 | + plink = !!au_opt_test(au_mntflags(sb), PLINK); | |
2370 | + dst_inode = au_h_iptr(inode, bdst); | |
2371 | + if (dst_inode) { | |
2372 | + if (unlikely(!plink)) { | |
2373 | + err = -EIO; | |
2374 | + AuIOErr("i%lu exists on a upper branch " | |
2375 | + "but plink is disabled\n", inode->i_ino); | |
2376 | + goto out; | |
2377 | + } | |
2378 | + | |
2379 | + if (dst_inode->i_nlink) { | |
2380 | + const int do_dt = au_ftest_cpup(flags, DTIME); | |
2381 | + | |
2382 | + h_src = au_plink_lkup(inode, bdst); | |
2383 | + err = PTR_ERR(h_src); | |
2384 | + if (IS_ERR(h_src)) | |
2385 | + goto out; | |
2386 | + if (unlikely(!h_src->d_inode)) { | |
2387 | + err = -EIO; | |
2388 | + AuIOErr("i%lu exists on a upper branch " | |
2389 | + "but plink is broken\n", inode->i_ino); | |
2390 | + dput(h_src); | |
2391 | + goto out; | |
2392 | + } | |
2393 | + | |
2394 | + if (do_dt) { | |
2395 | + h_path.dentry = h_parent; | |
2396 | + au_dtime_store(&dt, dst_parent, &h_path); | |
2397 | + } | |
2398 | + h_path.dentry = h_dst; | |
2399 | + err = vfsub_link(h_src, h_dir, &h_path); | |
2400 | + if (do_dt) | |
2401 | + au_dtime_revert(&dt); | |
2402 | + dput(h_src); | |
2403 | + goto out; | |
2404 | + } else | |
2405 | + /* todo: cpup_wh_file? */ | |
2406 | + /* udba work */ | |
4a4d8108 | 2407 | + au_update_ibrange(inode, /*do_put_zero*/1); |
1facf9fc | 2408 | + } |
2409 | + | |
2410 | + old_ibstart = au_ibstart(inode); | |
2411 | + err = cpup_entry(dentry, bdst, bsrc, len, flags, dst_parent); | |
2412 | + if (unlikely(err)) | |
2413 | + goto out; | |
2414 | + dst_inode = h_dst->d_inode; | |
2415 | + mutex_lock_nested(&dst_inode->i_mutex, AuLsc_I_CHILD2); | |
2416 | + | |
2417 | + err = cpup_iattr(dentry, bdst, h_src); | |
2418 | + isdir = S_ISDIR(dst_inode->i_mode); | |
2419 | + if (!err) { | |
4a4d8108 AM |
2420 | + if (bdst < old_ibstart) { |
2421 | + if (S_ISREG(inode->i_mode)) { | |
2422 | + err = au_dy_iaop(inode, bdst, dst_inode); | |
2423 | + if (unlikely(err)) | |
2424 | + goto out_rev; | |
2425 | + } | |
1facf9fc | 2426 | + au_set_ibstart(inode, bdst); |
4a4d8108 | 2427 | + } |
1facf9fc | 2428 | + au_set_h_iptr(inode, bdst, au_igrab(dst_inode), |
2429 | + au_hi_flags(inode, isdir)); | |
2430 | + mutex_unlock(&dst_inode->i_mutex); | |
2431 | + if (!isdir | |
2432 | + && h_src->d_inode->i_nlink > 1 | |
2433 | + && plink) | |
2434 | + au_plink_append(inode, bdst, h_dst); | |
2435 | + goto out; /* success */ | |
2436 | + } | |
2437 | + | |
2438 | + /* revert */ | |
4a4d8108 | 2439 | +out_rev: |
1facf9fc | 2440 | + h_path.dentry = h_parent; |
2441 | + mutex_unlock(&dst_inode->i_mutex); | |
2442 | + au_dtime_store(&dt, dst_parent, &h_path); | |
2443 | + h_path.dentry = h_dst; | |
2444 | + if (!isdir) | |
2445 | + rerr = vfsub_unlink(h_dir, &h_path, /*force*/0); | |
2446 | + else | |
2447 | + rerr = vfsub_rmdir(h_dir, &h_path); | |
2448 | + au_dtime_revert(&dt); | |
2449 | + if (rerr) { | |
2450 | + AuIOErr("failed removing broken entry(%d, %d)\n", err, rerr); | |
2451 | + err = -EIO; | |
2452 | + } | |
2453 | + | |
4f0767ce | 2454 | +out: |
1facf9fc | 2455 | + dput(dst_parent); |
2456 | + return err; | |
2457 | +} | |
2458 | + | |
2459 | +struct au_cpup_single_args { | |
2460 | + int *errp; | |
2461 | + struct dentry *dentry; | |
2462 | + aufs_bindex_t bdst, bsrc; | |
2463 | + loff_t len; | |
2464 | + unsigned int flags; | |
2465 | + struct dentry *dst_parent; | |
2466 | +}; | |
2467 | + | |
2468 | +static void au_call_cpup_single(void *args) | |
2469 | +{ | |
2470 | + struct au_cpup_single_args *a = args; | |
2471 | + *a->errp = au_cpup_single(a->dentry, a->bdst, a->bsrc, a->len, | |
2472 | + a->flags, a->dst_parent); | |
2473 | +} | |
2474 | + | |
2475 | +int au_sio_cpup_single(struct dentry *dentry, aufs_bindex_t bdst, | |
2476 | + aufs_bindex_t bsrc, loff_t len, unsigned int flags, | |
2477 | + struct dentry *dst_parent) | |
2478 | +{ | |
2479 | + int err, wkq_err; | |
2480 | + umode_t mode; | |
2481 | + struct dentry *h_dentry; | |
2482 | + | |
2483 | + h_dentry = au_h_dptr(dentry, bsrc); | |
2484 | + mode = h_dentry->d_inode->i_mode & S_IFMT; | |
2485 | + if ((mode != S_IFCHR && mode != S_IFBLK) | |
2486 | + || capable(CAP_MKNOD)) | |
2487 | + err = au_cpup_single(dentry, bdst, bsrc, len, flags, | |
2488 | + dst_parent); | |
2489 | + else { | |
2490 | + struct au_cpup_single_args args = { | |
2491 | + .errp = &err, | |
2492 | + .dentry = dentry, | |
2493 | + .bdst = bdst, | |
2494 | + .bsrc = bsrc, | |
2495 | + .len = len, | |
2496 | + .flags = flags, | |
2497 | + .dst_parent = dst_parent | |
2498 | + }; | |
2499 | + wkq_err = au_wkq_wait(au_call_cpup_single, &args); | |
2500 | + if (unlikely(wkq_err)) | |
2501 | + err = wkq_err; | |
2502 | + } | |
2503 | + | |
2504 | + return err; | |
2505 | +} | |
2506 | + | |
2507 | +/* | |
2508 | + * copyup the @dentry from the first active lower branch to @bdst, | |
2509 | + * using au_cpup_single(). | |
2510 | + */ | |
2511 | +static int au_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len, | |
2512 | + unsigned int flags) | |
2513 | +{ | |
2514 | + int err; | |
2515 | + aufs_bindex_t bsrc, bend; | |
2516 | + | |
2517 | + bend = au_dbend(dentry); | |
2518 | + for (bsrc = bdst + 1; bsrc <= bend; bsrc++) | |
2519 | + if (au_h_dptr(dentry, bsrc)) | |
2520 | + break; | |
2521 | + | |
2522 | + err = au_lkup_neg(dentry, bdst); | |
2523 | + if (!err) { | |
2524 | + err = au_cpup_single(dentry, bdst, bsrc, len, flags, NULL); | |
2525 | + if (!err) | |
2526 | + return 0; /* success */ | |
2527 | + | |
2528 | + /* revert */ | |
2529 | + au_set_h_dptr(dentry, bdst, NULL); | |
2530 | + au_set_dbstart(dentry, bsrc); | |
2531 | + } | |
2532 | + | |
2533 | + return err; | |
2534 | +} | |
2535 | + | |
2536 | +struct au_cpup_simple_args { | |
2537 | + int *errp; | |
2538 | + struct dentry *dentry; | |
2539 | + aufs_bindex_t bdst; | |
2540 | + loff_t len; | |
2541 | + unsigned int flags; | |
2542 | +}; | |
2543 | + | |
2544 | +static void au_call_cpup_simple(void *args) | |
2545 | +{ | |
2546 | + struct au_cpup_simple_args *a = args; | |
2547 | + *a->errp = au_cpup_simple(a->dentry, a->bdst, a->len, a->flags); | |
2548 | +} | |
2549 | + | |
2550 | +int au_sio_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len, | |
2551 | + unsigned int flags) | |
2552 | +{ | |
2553 | + int err, wkq_err; | |
2554 | + unsigned char do_sio; | |
2555 | + struct dentry *parent; | |
2556 | + struct inode *h_dir; | |
2557 | + | |
2558 | + parent = dget_parent(dentry); | |
2559 | + h_dir = au_h_iptr(parent->d_inode, bdst); | |
2560 | + do_sio = !!au_test_h_perm_sio(h_dir, MAY_EXEC | MAY_WRITE); | |
2561 | + if (!do_sio) { | |
2562 | + /* | |
2563 | + * testing CAP_MKNOD is for generic fs, | |
2564 | + * but CAP_FSETID is for xfs only, currently. | |
2565 | + */ | |
2566 | + umode_t mode = dentry->d_inode->i_mode; | |
2567 | + do_sio = (((mode & (S_IFCHR | S_IFBLK)) | |
2568 | + && !capable(CAP_MKNOD)) | |
2569 | + || ((mode & (S_ISUID | S_ISGID)) | |
2570 | + && !capable(CAP_FSETID))); | |
2571 | + } | |
2572 | + if (!do_sio) | |
2573 | + err = au_cpup_simple(dentry, bdst, len, flags); | |
2574 | + else { | |
2575 | + struct au_cpup_simple_args args = { | |
2576 | + .errp = &err, | |
2577 | + .dentry = dentry, | |
2578 | + .bdst = bdst, | |
2579 | + .len = len, | |
2580 | + .flags = flags | |
2581 | + }; | |
2582 | + wkq_err = au_wkq_wait(au_call_cpup_simple, &args); | |
2583 | + if (unlikely(wkq_err)) | |
2584 | + err = wkq_err; | |
2585 | + } | |
2586 | + | |
2587 | + dput(parent); | |
2588 | + return err; | |
2589 | +} | |
2590 | + | |
2591 | +/* ---------------------------------------------------------------------- */ | |
2592 | + | |
2593 | +/* | |
2594 | + * copyup the deleted file for writing. | |
2595 | + */ | |
2596 | +static int au_do_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, | |
2597 | + struct dentry *wh_dentry, struct file *file, | |
2598 | + loff_t len) | |
2599 | +{ | |
2600 | + int err; | |
2601 | + aufs_bindex_t bstart; | |
2602 | + struct au_dinfo *dinfo; | |
2603 | + struct dentry *h_d_dst, *h_d_start; | |
4a4d8108 | 2604 | + struct au_hdentry *hdp; |
1facf9fc | 2605 | + |
2606 | + dinfo = au_di(dentry); | |
1308ab2a | 2607 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
2608 | + | |
1facf9fc | 2609 | + bstart = dinfo->di_bstart; |
4a4d8108 AM |
2610 | + hdp = dinfo->di_hdentry; |
2611 | + h_d_dst = hdp[0 + bdst].hd_dentry; | |
1facf9fc | 2612 | + dinfo->di_bstart = bdst; |
4a4d8108 AM |
2613 | + hdp[0 + bdst].hd_dentry = wh_dentry; |
2614 | + h_d_start = hdp[0 + bstart].hd_dentry; | |
1facf9fc | 2615 | + if (file) |
4a4d8108 | 2616 | + hdp[0 + bstart].hd_dentry = au_hf_top(file)->f_dentry; |
1facf9fc | 2617 | + err = au_cpup_single(dentry, bdst, bstart, len, !AuCpup_DTIME, |
2618 | + /*h_parent*/NULL); | |
2619 | + if (!err && file) { | |
2620 | + err = au_reopen_nondir(file); | |
4a4d8108 | 2621 | + hdp[0 + bstart].hd_dentry = h_d_start; |
1facf9fc | 2622 | + } |
4a4d8108 | 2623 | + hdp[0 + bdst].hd_dentry = h_d_dst; |
1facf9fc | 2624 | + dinfo->di_bstart = bstart; |
2625 | + | |
2626 | + return err; | |
2627 | +} | |
2628 | + | |
2629 | +static int au_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len, | |
2630 | + struct file *file) | |
2631 | +{ | |
2632 | + int err; | |
2633 | + struct au_dtime dt; | |
2634 | + struct dentry *parent, *h_parent, *wh_dentry; | |
2635 | + struct au_branch *br; | |
2636 | + struct path h_path; | |
2637 | + | |
2638 | + br = au_sbr(dentry->d_sb, bdst); | |
2639 | + parent = dget_parent(dentry); | |
2640 | + h_parent = au_h_dptr(parent, bdst); | |
2641 | + wh_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name); | |
2642 | + err = PTR_ERR(wh_dentry); | |
2643 | + if (IS_ERR(wh_dentry)) | |
2644 | + goto out; | |
2645 | + | |
2646 | + h_path.dentry = h_parent; | |
2647 | + h_path.mnt = br->br_mnt; | |
2648 | + au_dtime_store(&dt, parent, &h_path); | |
2649 | + err = au_do_cpup_wh(dentry, bdst, wh_dentry, file, len); | |
2650 | + if (unlikely(err)) | |
2651 | + goto out_wh; | |
2652 | + | |
2653 | + dget(wh_dentry); | |
2654 | + h_path.dentry = wh_dentry; | |
4a4d8108 AM |
2655 | + if (!S_ISDIR(wh_dentry->d_inode->i_mode)) |
2656 | + err = vfsub_unlink(h_parent->d_inode, &h_path, /*force*/0); | |
2657 | + else | |
2658 | + err = vfsub_rmdir(h_parent->d_inode, &h_path); | |
1facf9fc | 2659 | + if (unlikely(err)) { |
2660 | + AuIOErr("failed remove copied-up tmp file %.*s(%d)\n", | |
2661 | + AuDLNPair(wh_dentry), err); | |
2662 | + err = -EIO; | |
2663 | + } | |
2664 | + au_dtime_revert(&dt); | |
2665 | + au_set_hi_wh(dentry->d_inode, bdst, wh_dentry); | |
2666 | + | |
4f0767ce | 2667 | +out_wh: |
1facf9fc | 2668 | + dput(wh_dentry); |
4f0767ce | 2669 | +out: |
1facf9fc | 2670 | + dput(parent); |
2671 | + return err; | |
2672 | +} | |
2673 | + | |
2674 | +struct au_cpup_wh_args { | |
2675 | + int *errp; | |
2676 | + struct dentry *dentry; | |
2677 | + aufs_bindex_t bdst; | |
2678 | + loff_t len; | |
2679 | + struct file *file; | |
2680 | +}; | |
2681 | + | |
2682 | +static void au_call_cpup_wh(void *args) | |
2683 | +{ | |
2684 | + struct au_cpup_wh_args *a = args; | |
2685 | + *a->errp = au_cpup_wh(a->dentry, a->bdst, a->len, a->file); | |
2686 | +} | |
2687 | + | |
2688 | +int au_sio_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len, | |
2689 | + struct file *file) | |
2690 | +{ | |
2691 | + int err, wkq_err; | |
2692 | + struct dentry *parent, *h_orph, *h_parent, *h_dentry; | |
2693 | + struct inode *dir, *h_dir, *h_tmpdir, *h_inode; | |
2694 | + struct au_wbr *wbr; | |
2695 | + | |
2696 | + parent = dget_parent(dentry); | |
2697 | + dir = parent->d_inode; | |
2698 | + h_orph = NULL; | |
2699 | + h_parent = NULL; | |
2700 | + h_dir = au_igrab(au_h_iptr(dir, bdst)); | |
2701 | + h_tmpdir = h_dir; | |
2702 | + if (!h_dir->i_nlink) { | |
2703 | + wbr = au_sbr(dentry->d_sb, bdst)->br_wbr; | |
2704 | + h_orph = wbr->wbr_orph; | |
2705 | + | |
2706 | + h_parent = dget(au_h_dptr(parent, bdst)); | |
1facf9fc | 2707 | + au_set_h_dptr(parent, bdst, dget(h_orph)); |
2708 | + h_tmpdir = h_orph->d_inode; | |
1facf9fc | 2709 | + au_set_h_iptr(dir, bdst, au_igrab(h_tmpdir), /*flags*/0); |
2710 | + | |
2711 | + /* this temporary unlock is safe */ | |
2712 | + if (file) | |
4a4d8108 | 2713 | + h_dentry = au_hf_top(file)->f_dentry; |
1facf9fc | 2714 | + else |
2715 | + h_dentry = au_h_dptr(dentry, au_dbstart(dentry)); | |
2716 | + h_inode = h_dentry->d_inode; | |
2717 | + IMustLock(h_inode); | |
2718 | + mutex_unlock(&h_inode->i_mutex); | |
dece6358 | 2719 | + mutex_lock_nested(&h_tmpdir->i_mutex, AuLsc_I_PARENT3); |
1facf9fc | 2720 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); |
4a4d8108 | 2721 | + /* todo: au_h_open_pre()? */ |
1facf9fc | 2722 | + } |
2723 | + | |
2724 | + if (!au_test_h_perm_sio(h_tmpdir, MAY_EXEC | MAY_WRITE)) | |
2725 | + err = au_cpup_wh(dentry, bdst, len, file); | |
2726 | + else { | |
2727 | + struct au_cpup_wh_args args = { | |
2728 | + .errp = &err, | |
2729 | + .dentry = dentry, | |
2730 | + .bdst = bdst, | |
2731 | + .len = len, | |
2732 | + .file = file | |
2733 | + }; | |
2734 | + wkq_err = au_wkq_wait(au_call_cpup_wh, &args); | |
2735 | + if (unlikely(wkq_err)) | |
2736 | + err = wkq_err; | |
2737 | + } | |
2738 | + | |
2739 | + if (h_orph) { | |
2740 | + mutex_unlock(&h_tmpdir->i_mutex); | |
4a4d8108 | 2741 | + /* todo: au_h_open_post()? */ |
1facf9fc | 2742 | + au_set_h_iptr(dir, bdst, au_igrab(h_dir), /*flags*/0); |
1facf9fc | 2743 | + au_set_h_dptr(parent, bdst, h_parent); |
2744 | + } | |
2745 | + iput(h_dir); | |
2746 | + dput(parent); | |
2747 | + | |
2748 | + return err; | |
2749 | +} | |
2750 | + | |
2751 | +/* ---------------------------------------------------------------------- */ | |
2752 | + | |
2753 | +/* | |
2754 | + * generic routine for both of copy-up and copy-down. | |
2755 | + */ | |
2756 | +/* cf. revalidate function in file.c */ | |
2757 | +int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst, | |
2758 | + int (*cp)(struct dentry *dentry, aufs_bindex_t bdst, | |
2759 | + struct dentry *h_parent, void *arg), | |
2760 | + void *arg) | |
2761 | +{ | |
2762 | + int err; | |
2763 | + struct au_pin pin; | |
2764 | + struct dentry *d, *parent, *h_parent, *real_parent; | |
2765 | + | |
2766 | + err = 0; | |
2767 | + parent = dget_parent(dentry); | |
2768 | + if (IS_ROOT(parent)) | |
2769 | + goto out; | |
2770 | + | |
2771 | + au_pin_init(&pin, dentry, bdst, AuLsc_DI_PARENT2, AuLsc_I_PARENT2, | |
2772 | + au_opt_udba(dentry->d_sb), AuPin_MNT_WRITE); | |
2773 | + | |
2774 | + /* do not use au_dpage */ | |
2775 | + real_parent = parent; | |
2776 | + while (1) { | |
2777 | + dput(parent); | |
2778 | + parent = dget_parent(dentry); | |
2779 | + h_parent = au_h_dptr(parent, bdst); | |
2780 | + if (h_parent) | |
2781 | + goto out; /* success */ | |
2782 | + | |
2783 | + /* find top dir which is necessary to cpup */ | |
2784 | + do { | |
2785 | + d = parent; | |
2786 | + dput(parent); | |
2787 | + parent = dget_parent(d); | |
2788 | + di_read_lock_parent3(parent, !AuLock_IR); | |
2789 | + h_parent = au_h_dptr(parent, bdst); | |
2790 | + di_read_unlock(parent, !AuLock_IR); | |
2791 | + } while (!h_parent); | |
2792 | + | |
2793 | + if (d != real_parent) | |
2794 | + di_write_lock_child3(d); | |
2795 | + | |
2796 | + /* somebody else might create while we were sleeping */ | |
2797 | + if (!au_h_dptr(d, bdst) || !au_h_dptr(d, bdst)->d_inode) { | |
2798 | + if (au_h_dptr(d, bdst)) | |
2799 | + au_update_dbstart(d); | |
2800 | + | |
2801 | + au_pin_set_dentry(&pin, d); | |
2802 | + err = au_do_pin(&pin); | |
2803 | + if (!err) { | |
2804 | + err = cp(d, bdst, h_parent, arg); | |
2805 | + au_unpin(&pin); | |
2806 | + } | |
2807 | + } | |
2808 | + | |
2809 | + if (d != real_parent) | |
2810 | + di_write_unlock(d); | |
2811 | + if (unlikely(err)) | |
2812 | + break; | |
2813 | + } | |
2814 | + | |
4f0767ce | 2815 | +out: |
1facf9fc | 2816 | + dput(parent); |
2817 | + return err; | |
2818 | +} | |
2819 | + | |
2820 | +static int au_cpup_dir(struct dentry *dentry, aufs_bindex_t bdst, | |
2821 | + struct dentry *h_parent __maybe_unused , | |
2822 | + void *arg __maybe_unused) | |
2823 | +{ | |
2824 | + return au_sio_cpup_simple(dentry, bdst, -1, AuCpup_DTIME); | |
2825 | +} | |
2826 | + | |
2827 | +int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst) | |
2828 | +{ | |
2829 | + return au_cp_dirs(dentry, bdst, au_cpup_dir, NULL); | |
2830 | +} | |
2831 | + | |
2832 | +int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst) | |
2833 | +{ | |
2834 | + int err; | |
2835 | + struct dentry *parent; | |
2836 | + struct inode *dir; | |
2837 | + | |
2838 | + parent = dget_parent(dentry); | |
2839 | + dir = parent->d_inode; | |
2840 | + err = 0; | |
2841 | + if (au_h_iptr(dir, bdst)) | |
2842 | + goto out; | |
2843 | + | |
2844 | + di_read_unlock(parent, AuLock_IR); | |
2845 | + di_write_lock_parent(parent); | |
2846 | + /* someone else might change our inode while we were sleeping */ | |
2847 | + if (!au_h_iptr(dir, bdst)) | |
2848 | + err = au_cpup_dirs(dentry, bdst); | |
2849 | + di_downgrade_lock(parent, AuLock_IR); | |
2850 | + | |
4f0767ce | 2851 | +out: |
1facf9fc | 2852 | + dput(parent); |
2853 | + return err; | |
2854 | +} | |
b752ccd1 AM |
2855 | diff -urN /usr/share/empty/fs/aufs/cpup.h linux/fs/aufs/cpup.h |
2856 | --- /usr/share/empty/fs/aufs/cpup.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 2857 | +++ linux/fs/aufs/cpup.h 2010-10-21 09:52:43.086957936 +0200 |
dece6358 | 2858 | @@ -0,0 +1,81 @@ |
1facf9fc | 2859 | +/* |
4a4d8108 | 2860 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 2861 | + * |
2862 | + * This program, aufs is free software; you can redistribute it and/or modify | |
2863 | + * it under the terms of the GNU General Public License as published by | |
2864 | + * the Free Software Foundation; either version 2 of the License, or | |
2865 | + * (at your option) any later version. | |
dece6358 AM |
2866 | + * |
2867 | + * This program is distributed in the hope that it will be useful, | |
2868 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2869 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2870 | + * GNU General Public License for more details. | |
2871 | + * | |
2872 | + * You should have received a copy of the GNU General Public License | |
2873 | + * along with this program; if not, write to the Free Software | |
2874 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 2875 | + */ |
2876 | + | |
2877 | +/* | |
2878 | + * copy-up/down functions | |
2879 | + */ | |
2880 | + | |
2881 | +#ifndef __AUFS_CPUP_H__ | |
2882 | +#define __AUFS_CPUP_H__ | |
2883 | + | |
2884 | +#ifdef __KERNEL__ | |
2885 | + | |
dece6358 AM |
2886 | +#include <linux/path.h> |
2887 | +#include <linux/time.h> | |
1facf9fc | 2888 | +#include <linux/aufs_type.h> |
2889 | + | |
dece6358 AM |
2890 | +struct inode; |
2891 | +struct file; | |
2892 | + | |
1facf9fc | 2893 | +void au_cpup_attr_flags(struct inode *dst, struct inode *src); |
2894 | +void au_cpup_attr_timesizes(struct inode *inode); | |
2895 | +void au_cpup_attr_nlink(struct inode *inode, int force); | |
2896 | +void au_cpup_attr_changeable(struct inode *inode); | |
2897 | +void au_cpup_igen(struct inode *inode, struct inode *h_inode); | |
2898 | +void au_cpup_attr_all(struct inode *inode, int force); | |
2899 | + | |
2900 | +/* ---------------------------------------------------------------------- */ | |
2901 | + | |
2902 | +/* cpup flags */ | |
2903 | +#define AuCpup_DTIME 1 /* do dtime_store/revert */ | |
2904 | +#define AuCpup_KEEPLINO (1 << 1) /* do not clear the lower xino, | |
2905 | + for link(2) */ | |
2906 | +#define au_ftest_cpup(flags, name) ((flags) & AuCpup_##name) | |
2907 | +#define au_fset_cpup(flags, name) { (flags) |= AuCpup_##name; } | |
2908 | +#define au_fclr_cpup(flags, name) { (flags) &= ~AuCpup_##name; } | |
2909 | + | |
2910 | +int au_copy_file(struct file *dst, struct file *src, loff_t len); | |
2911 | +int au_sio_cpup_single(struct dentry *dentry, aufs_bindex_t bdst, | |
2912 | + aufs_bindex_t bsrc, loff_t len, unsigned int flags, | |
2913 | + struct dentry *dst_parent); | |
2914 | +int au_sio_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len, | |
2915 | + unsigned int flags); | |
2916 | +int au_sio_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len, | |
2917 | + struct file *file); | |
2918 | + | |
2919 | +int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst, | |
2920 | + int (*cp)(struct dentry *dentry, aufs_bindex_t bdst, | |
2921 | + struct dentry *h_parent, void *arg), | |
2922 | + void *arg); | |
2923 | +int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst); | |
2924 | +int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst); | |
2925 | + | |
2926 | +/* ---------------------------------------------------------------------- */ | |
2927 | + | |
2928 | +/* keep timestamps when copyup */ | |
2929 | +struct au_dtime { | |
2930 | + struct dentry *dt_dentry; | |
2931 | + struct path dt_h_path; | |
2932 | + struct timespec dt_atime, dt_mtime; | |
2933 | +}; | |
2934 | +void au_dtime_store(struct au_dtime *dt, struct dentry *dentry, | |
2935 | + struct path *h_path); | |
2936 | +void au_dtime_revert(struct au_dtime *dt); | |
2937 | + | |
2938 | +#endif /* __KERNEL__ */ | |
2939 | +#endif /* __AUFS_CPUP_H__ */ | |
b752ccd1 AM |
2940 | diff -urN /usr/share/empty/fs/aufs/dbgaufs.c linux/fs/aufs/dbgaufs.c |
2941 | --- /usr/share/empty/fs/aufs/dbgaufs.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 2942 | +++ linux/fs/aufs/dbgaufs.c 2010-10-21 09:52:43.086957936 +0200 |
4a4d8108 | 2943 | @@ -0,0 +1,334 @@ |
1facf9fc | 2944 | +/* |
4a4d8108 | 2945 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 2946 | + * |
2947 | + * This program, aufs is free software; you can redistribute it and/or modify | |
2948 | + * it under the terms of the GNU General Public License as published by | |
2949 | + * the Free Software Foundation; either version 2 of the License, or | |
2950 | + * (at your option) any later version. | |
dece6358 AM |
2951 | + * |
2952 | + * This program is distributed in the hope that it will be useful, | |
2953 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2954 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2955 | + * GNU General Public License for more details. | |
2956 | + * | |
2957 | + * You should have received a copy of the GNU General Public License | |
2958 | + * along with this program; if not, write to the Free Software | |
2959 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 2960 | + */ |
2961 | + | |
2962 | +/* | |
2963 | + * debugfs interface | |
2964 | + */ | |
2965 | + | |
2966 | +#include <linux/debugfs.h> | |
2967 | +#include "aufs.h" | |
2968 | + | |
2969 | +#ifndef CONFIG_SYSFS | |
2970 | +#error DEBUG_FS depends upon SYSFS | |
2971 | +#endif | |
2972 | + | |
2973 | +static struct dentry *dbgaufs; | |
2974 | +static const mode_t dbgaufs_mode = S_IRUSR | S_IRGRP | S_IROTH; | |
2975 | + | |
2976 | +/* 20 is max digits length of ulong 64 */ | |
2977 | +struct dbgaufs_arg { | |
2978 | + int n; | |
2979 | + char a[20 * 4]; | |
2980 | +}; | |
2981 | + | |
2982 | +/* | |
2983 | + * common function for all XINO files | |
2984 | + */ | |
2985 | +static int dbgaufs_xi_release(struct inode *inode __maybe_unused, | |
2986 | + struct file *file) | |
2987 | +{ | |
2988 | + kfree(file->private_data); | |
2989 | + return 0; | |
2990 | +} | |
2991 | + | |
2992 | +static int dbgaufs_xi_open(struct file *xf, struct file *file, int do_fcnt) | |
2993 | +{ | |
2994 | + int err; | |
2995 | + struct kstat st; | |
2996 | + struct dbgaufs_arg *p; | |
2997 | + | |
2998 | + err = -ENOMEM; | |
2999 | + p = kmalloc(sizeof(*p), GFP_NOFS); | |
3000 | + if (unlikely(!p)) | |
3001 | + goto out; | |
3002 | + | |
3003 | + err = 0; | |
3004 | + p->n = 0; | |
3005 | + file->private_data = p; | |
3006 | + if (!xf) | |
3007 | + goto out; | |
3008 | + | |
3009 | + err = vfs_getattr(xf->f_vfsmnt, xf->f_dentry, &st); | |
3010 | + if (!err) { | |
3011 | + if (do_fcnt) | |
3012 | + p->n = snprintf | |
3013 | + (p->a, sizeof(p->a), "%ld, %llux%lu %lld\n", | |
3014 | + (long)file_count(xf), st.blocks, st.blksize, | |
3015 | + (long long)st.size); | |
3016 | + else | |
3017 | + p->n = snprintf(p->a, sizeof(p->a), "%llux%lu %lld\n", | |
3018 | + st.blocks, st.blksize, | |
3019 | + (long long)st.size); | |
3020 | + AuDebugOn(p->n >= sizeof(p->a)); | |
3021 | + } else { | |
3022 | + p->n = snprintf(p->a, sizeof(p->a), "err %d\n", err); | |
3023 | + err = 0; | |
3024 | + } | |
3025 | + | |
4f0767ce | 3026 | +out: |
1facf9fc | 3027 | + return err; |
3028 | + | |
3029 | +} | |
3030 | + | |
3031 | +static ssize_t dbgaufs_xi_read(struct file *file, char __user *buf, | |
3032 | + size_t count, loff_t *ppos) | |
3033 | +{ | |
3034 | + struct dbgaufs_arg *p; | |
3035 | + | |
3036 | + p = file->private_data; | |
3037 | + return simple_read_from_buffer(buf, count, ppos, p->a, p->n); | |
3038 | +} | |
3039 | + | |
3040 | +/* ---------------------------------------------------------------------- */ | |
3041 | + | |
3042 | +static int dbgaufs_xib_open(struct inode *inode, struct file *file) | |
3043 | +{ | |
3044 | + int err; | |
3045 | + struct au_sbinfo *sbinfo; | |
3046 | + struct super_block *sb; | |
3047 | + | |
3048 | + sbinfo = inode->i_private; | |
3049 | + sb = sbinfo->si_sb; | |
3050 | + si_noflush_read_lock(sb); | |
3051 | + err = dbgaufs_xi_open(sbinfo->si_xib, file, /*do_fcnt*/0); | |
3052 | + si_read_unlock(sb); | |
3053 | + return err; | |
3054 | +} | |
3055 | + | |
3056 | +static const struct file_operations dbgaufs_xib_fop = { | |
4a4d8108 | 3057 | + .owner = THIS_MODULE, |
1facf9fc | 3058 | + .open = dbgaufs_xib_open, |
3059 | + .release = dbgaufs_xi_release, | |
3060 | + .read = dbgaufs_xi_read | |
3061 | +}; | |
3062 | + | |
3063 | +/* ---------------------------------------------------------------------- */ | |
3064 | + | |
3065 | +#define DbgaufsXi_PREFIX "xi" | |
3066 | + | |
3067 | +static int dbgaufs_xino_open(struct inode *inode, struct file *file) | |
3068 | +{ | |
3069 | + int err; | |
3070 | + long l; | |
3071 | + struct au_sbinfo *sbinfo; | |
3072 | + struct super_block *sb; | |
3073 | + struct file *xf; | |
3074 | + struct qstr *name; | |
3075 | + | |
3076 | + err = -ENOENT; | |
3077 | + xf = NULL; | |
3078 | + name = &file->f_dentry->d_name; | |
3079 | + if (unlikely(name->len < sizeof(DbgaufsXi_PREFIX) | |
3080 | + || memcmp(name->name, DbgaufsXi_PREFIX, | |
3081 | + sizeof(DbgaufsXi_PREFIX) - 1))) | |
3082 | + goto out; | |
3083 | + err = strict_strtol(name->name + sizeof(DbgaufsXi_PREFIX) - 1, 10, &l); | |
3084 | + if (unlikely(err)) | |
3085 | + goto out; | |
3086 | + | |
3087 | + sbinfo = inode->i_private; | |
3088 | + sb = sbinfo->si_sb; | |
3089 | + si_noflush_read_lock(sb); | |
3090 | + if (l <= au_sbend(sb)) { | |
3091 | + xf = au_sbr(sb, (aufs_bindex_t)l)->br_xino.xi_file; | |
3092 | + err = dbgaufs_xi_open(xf, file, /*do_fcnt*/1); | |
3093 | + } else | |
3094 | + err = -ENOENT; | |
3095 | + si_read_unlock(sb); | |
3096 | + | |
4f0767ce | 3097 | +out: |
1facf9fc | 3098 | + return err; |
3099 | +} | |
3100 | + | |
3101 | +static const struct file_operations dbgaufs_xino_fop = { | |
4a4d8108 | 3102 | + .owner = THIS_MODULE, |
1facf9fc | 3103 | + .open = dbgaufs_xino_open, |
3104 | + .release = dbgaufs_xi_release, | |
3105 | + .read = dbgaufs_xi_read | |
3106 | +}; | |
3107 | + | |
3108 | +void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex) | |
3109 | +{ | |
3110 | + aufs_bindex_t bend; | |
3111 | + struct au_branch *br; | |
3112 | + struct au_xino_file *xi; | |
3113 | + | |
3114 | + if (!au_sbi(sb)->si_dbgaufs) | |
3115 | + return; | |
3116 | + | |
3117 | + bend = au_sbend(sb); | |
3118 | + for (; bindex <= bend; bindex++) { | |
3119 | + br = au_sbr(sb, bindex); | |
3120 | + xi = &br->br_xino; | |
3121 | + if (xi->xi_dbgaufs) { | |
3122 | + debugfs_remove(xi->xi_dbgaufs); | |
3123 | + xi->xi_dbgaufs = NULL; | |
3124 | + } | |
3125 | + } | |
3126 | +} | |
3127 | + | |
3128 | +void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex) | |
3129 | +{ | |
3130 | + struct au_sbinfo *sbinfo; | |
3131 | + struct dentry *parent; | |
3132 | + struct au_branch *br; | |
3133 | + struct au_xino_file *xi; | |
3134 | + aufs_bindex_t bend; | |
3135 | + char name[sizeof(DbgaufsXi_PREFIX) + 5]; /* "xi" bindex NULL */ | |
3136 | + | |
3137 | + sbinfo = au_sbi(sb); | |
3138 | + parent = sbinfo->si_dbgaufs; | |
3139 | + if (!parent) | |
3140 | + return; | |
3141 | + | |
3142 | + bend = au_sbend(sb); | |
3143 | + for (; bindex <= bend; bindex++) { | |
3144 | + snprintf(name, sizeof(name), DbgaufsXi_PREFIX "%d", bindex); | |
3145 | + br = au_sbr(sb, bindex); | |
3146 | + xi = &br->br_xino; | |
3147 | + AuDebugOn(xi->xi_dbgaufs); | |
3148 | + xi->xi_dbgaufs = debugfs_create_file(name, dbgaufs_mode, parent, | |
3149 | + sbinfo, &dbgaufs_xino_fop); | |
3150 | + /* ignore an error */ | |
3151 | + if (unlikely(!xi->xi_dbgaufs)) | |
3152 | + AuWarn1("failed %s under debugfs\n", name); | |
3153 | + } | |
3154 | +} | |
3155 | + | |
3156 | +/* ---------------------------------------------------------------------- */ | |
3157 | + | |
3158 | +#ifdef CONFIG_AUFS_EXPORT | |
3159 | +static int dbgaufs_xigen_open(struct inode *inode, struct file *file) | |
3160 | +{ | |
3161 | + int err; | |
3162 | + struct au_sbinfo *sbinfo; | |
3163 | + struct super_block *sb; | |
3164 | + | |
3165 | + sbinfo = inode->i_private; | |
3166 | + sb = sbinfo->si_sb; | |
3167 | + si_noflush_read_lock(sb); | |
3168 | + err = dbgaufs_xi_open(sbinfo->si_xigen, file, /*do_fcnt*/0); | |
3169 | + si_read_unlock(sb); | |
3170 | + return err; | |
3171 | +} | |
3172 | + | |
3173 | +static const struct file_operations dbgaufs_xigen_fop = { | |
4a4d8108 | 3174 | + .owner = THIS_MODULE, |
1facf9fc | 3175 | + .open = dbgaufs_xigen_open, |
3176 | + .release = dbgaufs_xi_release, | |
3177 | + .read = dbgaufs_xi_read | |
3178 | +}; | |
3179 | + | |
3180 | +static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo) | |
3181 | +{ | |
3182 | + int err; | |
3183 | + | |
dece6358 AM |
3184 | + /* |
3185 | + * This function is a dynamic '__init' fucntion actually, | |
3186 | + * so the tiny check for si_rwsem is unnecessary. | |
3187 | + */ | |
3188 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
3189 | + | |
1facf9fc | 3190 | + err = -EIO; |
3191 | + sbinfo->si_dbgaufs_xigen = debugfs_create_file | |
3192 | + ("xigen", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo, | |
3193 | + &dbgaufs_xigen_fop); | |
3194 | + if (sbinfo->si_dbgaufs_xigen) | |
3195 | + err = 0; | |
3196 | + | |
3197 | + return err; | |
3198 | +} | |
3199 | +#else | |
3200 | +static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo) | |
3201 | +{ | |
3202 | + return 0; | |
3203 | +} | |
3204 | +#endif /* CONFIG_AUFS_EXPORT */ | |
3205 | + | |
3206 | +/* ---------------------------------------------------------------------- */ | |
3207 | + | |
3208 | +void dbgaufs_si_fin(struct au_sbinfo *sbinfo) | |
3209 | +{ | |
dece6358 AM |
3210 | + /* |
3211 | + * This function is a dynamic '__init' fucntion actually, | |
3212 | + * so the tiny check for si_rwsem is unnecessary. | |
3213 | + */ | |
3214 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
3215 | + | |
1facf9fc | 3216 | + debugfs_remove_recursive(sbinfo->si_dbgaufs); |
3217 | + sbinfo->si_dbgaufs = NULL; | |
3218 | + kobject_put(&sbinfo->si_kobj); | |
3219 | +} | |
3220 | + | |
3221 | +int dbgaufs_si_init(struct au_sbinfo *sbinfo) | |
3222 | +{ | |
3223 | + int err; | |
3224 | + char name[SysaufsSiNameLen]; | |
3225 | + | |
dece6358 AM |
3226 | + /* |
3227 | + * This function is a dynamic '__init' fucntion actually, | |
3228 | + * so the tiny check for si_rwsem is unnecessary. | |
3229 | + */ | |
3230 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
3231 | + | |
1facf9fc | 3232 | + err = -ENOENT; |
3233 | + if (!dbgaufs) { | |
3234 | + AuErr1("/debug/aufs is uninitialized\n"); | |
3235 | + goto out; | |
3236 | + } | |
3237 | + | |
3238 | + err = -EIO; | |
3239 | + sysaufs_name(sbinfo, name); | |
3240 | + sbinfo->si_dbgaufs = debugfs_create_dir(name, dbgaufs); | |
3241 | + if (unlikely(!sbinfo->si_dbgaufs)) | |
3242 | + goto out; | |
3243 | + kobject_get(&sbinfo->si_kobj); | |
3244 | + | |
3245 | + sbinfo->si_dbgaufs_xib = debugfs_create_file | |
3246 | + ("xib", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo, | |
3247 | + &dbgaufs_xib_fop); | |
3248 | + if (unlikely(!sbinfo->si_dbgaufs_xib)) | |
3249 | + goto out_dir; | |
3250 | + | |
3251 | + err = dbgaufs_xigen_init(sbinfo); | |
3252 | + if (!err) | |
3253 | + goto out; /* success */ | |
3254 | + | |
4f0767ce | 3255 | +out_dir: |
1facf9fc | 3256 | + dbgaufs_si_fin(sbinfo); |
4f0767ce | 3257 | +out: |
1facf9fc | 3258 | + return err; |
3259 | +} | |
3260 | + | |
3261 | +/* ---------------------------------------------------------------------- */ | |
3262 | + | |
3263 | +void dbgaufs_fin(void) | |
3264 | +{ | |
3265 | + debugfs_remove(dbgaufs); | |
3266 | +} | |
3267 | + | |
3268 | +int __init dbgaufs_init(void) | |
3269 | +{ | |
3270 | + int err; | |
3271 | + | |
3272 | + err = -EIO; | |
3273 | + dbgaufs = debugfs_create_dir(AUFS_NAME, NULL); | |
3274 | + if (dbgaufs) | |
3275 | + err = 0; | |
3276 | + return err; | |
3277 | +} | |
b752ccd1 AM |
3278 | diff -urN /usr/share/empty/fs/aufs/dbgaufs.h linux/fs/aufs/dbgaufs.h |
3279 | --- /usr/share/empty/fs/aufs/dbgaufs.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 3280 | +++ linux/fs/aufs/dbgaufs.h 2010-10-21 09:52:43.086957936 +0200 |
4a4d8108 | 3281 | @@ -0,0 +1,52 @@ |
1facf9fc | 3282 | +/* |
4a4d8108 | 3283 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 3284 | + * |
3285 | + * This program, aufs is free software; you can redistribute it and/or modify | |
3286 | + * it under the terms of the GNU General Public License as published by | |
3287 | + * the Free Software Foundation; either version 2 of the License, or | |
3288 | + * (at your option) any later version. | |
dece6358 AM |
3289 | + * |
3290 | + * This program is distributed in the hope that it will be useful, | |
3291 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
3292 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
3293 | + * GNU General Public License for more details. | |
3294 | + * | |
3295 | + * You should have received a copy of the GNU General Public License | |
3296 | + * along with this program; if not, write to the Free Software | |
3297 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 3298 | + */ |
3299 | + | |
3300 | +/* | |
3301 | + * debugfs interface | |
3302 | + */ | |
3303 | + | |
3304 | +#ifndef __DBGAUFS_H__ | |
3305 | +#define __DBGAUFS_H__ | |
3306 | + | |
3307 | +#ifdef __KERNEL__ | |
3308 | + | |
dece6358 | 3309 | +#include <linux/init.h> |
1facf9fc | 3310 | +#include <linux/aufs_type.h> |
3311 | + | |
dece6358 | 3312 | +struct super_block; |
1facf9fc | 3313 | +struct au_sbinfo; |
dece6358 | 3314 | + |
1facf9fc | 3315 | +#ifdef CONFIG_DEBUG_FS |
3316 | +/* dbgaufs.c */ | |
3317 | +void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex); | |
3318 | +void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex); | |
3319 | +void dbgaufs_si_fin(struct au_sbinfo *sbinfo); | |
3320 | +int dbgaufs_si_init(struct au_sbinfo *sbinfo); | |
3321 | +void dbgaufs_fin(void); | |
3322 | +int __init dbgaufs_init(void); | |
1facf9fc | 3323 | +#else |
4a4d8108 AM |
3324 | +AuStubVoid(dbgaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex) |
3325 | +AuStubVoid(dbgaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex) | |
3326 | +AuStubVoid(dbgaufs_si_fin, struct au_sbinfo *sbinfo) | |
3327 | +AuStubInt0(dbgaufs_si_init, struct au_sbinfo *sbinfo) | |
3328 | +AuStubVoid(dbgaufs_fin, void) | |
3329 | +AuStubInt0(__init dbgaufs_init, void) | |
1facf9fc | 3330 | +#endif /* CONFIG_DEBUG_FS */ |
3331 | + | |
3332 | +#endif /* __KERNEL__ */ | |
3333 | +#endif /* __DBGAUFS_H__ */ | |
b752ccd1 AM |
3334 | diff -urN /usr/share/empty/fs/aufs/dcsub.c linux/fs/aufs/dcsub.c |
3335 | --- /usr/share/empty/fs/aufs/dcsub.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 3336 | +++ linux/fs/aufs/dcsub.c 2010-10-21 09:52:43.086957936 +0200 |
4a4d8108 | 3337 | @@ -0,0 +1,200 @@ |
1facf9fc | 3338 | +/* |
4a4d8108 | 3339 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 3340 | + * |
3341 | + * This program, aufs is free software; you can redistribute it and/or modify | |
3342 | + * it under the terms of the GNU General Public License as published by | |
3343 | + * the Free Software Foundation; either version 2 of the License, or | |
3344 | + * (at your option) any later version. | |
dece6358 AM |
3345 | + * |
3346 | + * This program is distributed in the hope that it will be useful, | |
3347 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
3348 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
3349 | + * GNU General Public License for more details. | |
3350 | + * | |
3351 | + * You should have received a copy of the GNU General Public License | |
3352 | + * along with this program; if not, write to the Free Software | |
3353 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 3354 | + */ |
3355 | + | |
3356 | +/* | |
3357 | + * sub-routines for dentry cache | |
3358 | + */ | |
3359 | + | |
3360 | +#include "aufs.h" | |
3361 | + | |
3362 | +static void au_dpage_free(struct au_dpage *dpage) | |
3363 | +{ | |
3364 | + int i; | |
3365 | + struct dentry **p; | |
3366 | + | |
3367 | + p = dpage->dentries; | |
3368 | + for (i = 0; i < dpage->ndentry; i++) | |
3369 | + dput(*p++); | |
3370 | + free_page((unsigned long)dpage->dentries); | |
3371 | +} | |
3372 | + | |
3373 | +int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp) | |
3374 | +{ | |
3375 | + int err; | |
3376 | + void *p; | |
3377 | + | |
3378 | + err = -ENOMEM; | |
3379 | + dpages->dpages = kmalloc(sizeof(*dpages->dpages), gfp); | |
3380 | + if (unlikely(!dpages->dpages)) | |
3381 | + goto out; | |
3382 | + | |
3383 | + p = (void *)__get_free_page(gfp); | |
3384 | + if (unlikely(!p)) | |
3385 | + goto out_dpages; | |
3386 | + | |
3387 | + dpages->dpages[0].ndentry = 0; | |
3388 | + dpages->dpages[0].dentries = p; | |
3389 | + dpages->ndpage = 1; | |
3390 | + return 0; /* success */ | |
3391 | + | |
4f0767ce | 3392 | +out_dpages: |
1facf9fc | 3393 | + kfree(dpages->dpages); |
4f0767ce | 3394 | +out: |
1facf9fc | 3395 | + return err; |
3396 | +} | |
3397 | + | |
3398 | +void au_dpages_free(struct au_dcsub_pages *dpages) | |
3399 | +{ | |
3400 | + int i; | |
3401 | + struct au_dpage *p; | |
3402 | + | |
3403 | + p = dpages->dpages; | |
3404 | + for (i = 0; i < dpages->ndpage; i++) | |
3405 | + au_dpage_free(p++); | |
3406 | + kfree(dpages->dpages); | |
3407 | +} | |
3408 | + | |
3409 | +static int au_dpages_append(struct au_dcsub_pages *dpages, | |
3410 | + struct dentry *dentry, gfp_t gfp) | |
3411 | +{ | |
3412 | + int err, sz; | |
3413 | + struct au_dpage *dpage; | |
3414 | + void *p; | |
3415 | + | |
3416 | + dpage = dpages->dpages + dpages->ndpage - 1; | |
3417 | + sz = PAGE_SIZE / sizeof(dentry); | |
3418 | + if (unlikely(dpage->ndentry >= sz)) { | |
3419 | + AuLabel(new dpage); | |
3420 | + err = -ENOMEM; | |
3421 | + sz = dpages->ndpage * sizeof(*dpages->dpages); | |
3422 | + p = au_kzrealloc(dpages->dpages, sz, | |
3423 | + sz + sizeof(*dpages->dpages), gfp); | |
3424 | + if (unlikely(!p)) | |
3425 | + goto out; | |
3426 | + | |
3427 | + dpages->dpages = p; | |
3428 | + dpage = dpages->dpages + dpages->ndpage; | |
3429 | + p = (void *)__get_free_page(gfp); | |
3430 | + if (unlikely(!p)) | |
3431 | + goto out; | |
3432 | + | |
3433 | + dpage->ndentry = 0; | |
3434 | + dpage->dentries = p; | |
3435 | + dpages->ndpage++; | |
3436 | + } | |
3437 | + | |
3438 | + dpage->dentries[dpage->ndentry++] = dget(dentry); | |
3439 | + return 0; /* success */ | |
3440 | + | |
4f0767ce | 3441 | +out: |
1facf9fc | 3442 | + return err; |
3443 | +} | |
3444 | + | |
3445 | +int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root, | |
3446 | + au_dpages_test test, void *arg) | |
3447 | +{ | |
3448 | + int err; | |
3449 | + struct dentry *this_parent = root; | |
3450 | + struct list_head *next; | |
3451 | + struct super_block *sb = root->d_sb; | |
3452 | + | |
3453 | + err = 0; | |
3454 | + spin_lock(&dcache_lock); | |
4f0767ce | 3455 | +repeat: |
1facf9fc | 3456 | + next = this_parent->d_subdirs.next; |
4f0767ce | 3457 | +resume: |
1facf9fc | 3458 | + if (this_parent->d_sb == sb |
3459 | + && !IS_ROOT(this_parent) | |
3460 | + && atomic_read(&this_parent->d_count) | |
3461 | + && this_parent->d_inode | |
3462 | + && (!test || test(this_parent, arg))) { | |
3463 | + err = au_dpages_append(dpages, this_parent, GFP_ATOMIC); | |
3464 | + if (unlikely(err)) | |
3465 | + goto out; | |
3466 | + } | |
3467 | + | |
3468 | + while (next != &this_parent->d_subdirs) { | |
3469 | + struct list_head *tmp = next; | |
3470 | + struct dentry *dentry = list_entry(tmp, struct dentry, | |
3471 | + d_u.d_child); | |
3472 | + next = tmp->next; | |
3473 | + if (/*d_unhashed(dentry) || */!dentry->d_inode) | |
3474 | + continue; | |
3475 | + if (!list_empty(&dentry->d_subdirs)) { | |
3476 | + this_parent = dentry; | |
3477 | + goto repeat; | |
3478 | + } | |
3479 | + if (dentry->d_sb == sb | |
3480 | + && atomic_read(&dentry->d_count) | |
3481 | + && (!test || test(dentry, arg))) { | |
3482 | + err = au_dpages_append(dpages, dentry, GFP_ATOMIC); | |
3483 | + if (unlikely(err)) | |
3484 | + goto out; | |
3485 | + } | |
3486 | + } | |
3487 | + | |
3488 | + if (this_parent != root) { | |
3489 | + next = this_parent->d_u.d_child.next; | |
3490 | + this_parent = this_parent->d_parent; /* dcache_lock is locked */ | |
3491 | + goto resume; | |
3492 | + } | |
4f0767ce | 3493 | +out: |
1facf9fc | 3494 | + spin_unlock(&dcache_lock); |
3495 | + return err; | |
3496 | +} | |
3497 | + | |
3498 | +int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry, | |
3499 | + int do_include, au_dpages_test test, void *arg) | |
3500 | +{ | |
3501 | + int err; | |
3502 | + | |
3503 | + err = 0; | |
3504 | + spin_lock(&dcache_lock); | |
3505 | + if (do_include && (!test || test(dentry, arg))) { | |
3506 | + err = au_dpages_append(dpages, dentry, GFP_ATOMIC); | |
3507 | + if (unlikely(err)) | |
3508 | + goto out; | |
3509 | + } | |
3510 | + while (!IS_ROOT(dentry)) { | |
3511 | + dentry = dentry->d_parent; /* dcache_lock is locked */ | |
3512 | + if (!test || test(dentry, arg)) { | |
3513 | + err = au_dpages_append(dpages, dentry, GFP_ATOMIC); | |
3514 | + if (unlikely(err)) | |
3515 | + break; | |
3516 | + } | |
3517 | + } | |
3518 | + | |
4f0767ce | 3519 | +out: |
1facf9fc | 3520 | + spin_unlock(&dcache_lock); |
3521 | + | |
3522 | + return err; | |
3523 | +} | |
3524 | + | |
4a4d8108 | 3525 | +int au_test_subdir(struct dentry *d1, struct dentry *d2) |
1facf9fc | 3526 | +{ |
4a4d8108 AM |
3527 | + struct path path[2] = { |
3528 | + { | |
3529 | + .dentry = d1 | |
3530 | + }, | |
3531 | + { | |
3532 | + .dentry = d2 | |
3533 | + } | |
3534 | + }; | |
1facf9fc | 3535 | + |
4a4d8108 | 3536 | + return path_is_under(path + 0, path + 1); |
1facf9fc | 3537 | +} |
b752ccd1 AM |
3538 | diff -urN /usr/share/empty/fs/aufs/dcsub.h linux/fs/aufs/dcsub.h |
3539 | --- /usr/share/empty/fs/aufs/dcsub.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 3540 | +++ linux/fs/aufs/dcsub.h 2010-10-21 09:52:43.086957936 +0200 |
dece6358 | 3541 | @@ -0,0 +1,54 @@ |
1facf9fc | 3542 | +/* |
4a4d8108 | 3543 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 3544 | + * |
3545 | + * This program, aufs is free software; you can redistribute it and/or modify | |
3546 | + * it under the terms of the GNU General Public License as published by | |
3547 | + * the Free Software Foundation; either version 2 of the License, or | |
3548 | + * (at your option) any later version. | |
dece6358 AM |
3549 | + * |
3550 | + * This program is distributed in the hope that it will be useful, | |
3551 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
3552 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
3553 | + * GNU General Public License for more details. | |
3554 | + * | |
3555 | + * You should have received a copy of the GNU General Public License | |
3556 | + * along with this program; if not, write to the Free Software | |
3557 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 3558 | + */ |
3559 | + | |
3560 | +/* | |
3561 | + * sub-routines for dentry cache | |
3562 | + */ | |
3563 | + | |
3564 | +#ifndef __AUFS_DCSUB_H__ | |
3565 | +#define __AUFS_DCSUB_H__ | |
3566 | + | |
3567 | +#ifdef __KERNEL__ | |
3568 | + | |
dece6358 AM |
3569 | +#include <linux/types.h> |
3570 | + | |
3571 | +struct dentry; | |
1facf9fc | 3572 | + |
3573 | +struct au_dpage { | |
3574 | + int ndentry; | |
3575 | + struct dentry **dentries; | |
3576 | +}; | |
3577 | + | |
3578 | +struct au_dcsub_pages { | |
3579 | + int ndpage; | |
3580 | + struct au_dpage *dpages; | |
3581 | +}; | |
3582 | + | |
3583 | +/* ---------------------------------------------------------------------- */ | |
3584 | + | |
3585 | +int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp); | |
3586 | +void au_dpages_free(struct au_dcsub_pages *dpages); | |
3587 | +typedef int (*au_dpages_test)(struct dentry *dentry, void *arg); | |
3588 | +int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root, | |
3589 | + au_dpages_test test, void *arg); | |
3590 | +int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry, | |
3591 | + int do_include, au_dpages_test test, void *arg); | |
4a4d8108 | 3592 | +int au_test_subdir(struct dentry *d1, struct dentry *d2); |
1facf9fc | 3593 | + |
3594 | +#endif /* __KERNEL__ */ | |
3595 | +#endif /* __AUFS_DCSUB_H__ */ | |
b752ccd1 AM |
3596 | diff -urN /usr/share/empty/fs/aufs/debug.c linux/fs/aufs/debug.c |
3597 | --- /usr/share/empty/fs/aufs/debug.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
3598 | +++ linux/fs/aufs/debug.c 2010-10-21 09:52:43.086957936 +0200 |
3599 | @@ -0,0 +1,426 @@ | |
1facf9fc | 3600 | +/* |
4a4d8108 | 3601 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 3602 | + * |
3603 | + * This program, aufs is free software; you can redistribute it and/or modify | |
3604 | + * it under the terms of the GNU General Public License as published by | |
3605 | + * the Free Software Foundation; either version 2 of the License, or | |
3606 | + * (at your option) any later version. | |
dece6358 AM |
3607 | + * |
3608 | + * This program is distributed in the hope that it will be useful, | |
3609 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
3610 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
3611 | + * GNU General Public License for more details. | |
3612 | + * | |
3613 | + * You should have received a copy of the GNU General Public License | |
3614 | + * along with this program; if not, write to the Free Software | |
3615 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 3616 | + */ |
3617 | + | |
3618 | +/* | |
3619 | + * debug print functions | |
3620 | + */ | |
3621 | + | |
dece6358 AM |
3622 | +#include <linux/module.h> |
3623 | +#include <linux/vt_kern.h> | |
1facf9fc | 3624 | +#include "aufs.h" |
3625 | + | |
3626 | +int aufs_debug; | |
3627 | +MODULE_PARM_DESC(debug, "debug print"); | |
3628 | +module_param_named(debug, aufs_debug, int, S_IRUGO | S_IWUSR | S_IWGRP); | |
3629 | + | |
3630 | +char *au_plevel = KERN_DEBUG; | |
953406b4 AM |
3631 | +#define dpri(fmt, ...) do { \ |
3632 | + if (au_debug_test()) \ | |
3633 | + printk("%s" fmt, au_plevel, ##__VA_ARGS__); \ | |
1facf9fc | 3634 | +} while (0) |
3635 | + | |
3636 | +/* ---------------------------------------------------------------------- */ | |
3637 | + | |
3638 | +void au_dpri_whlist(struct au_nhash *whlist) | |
3639 | +{ | |
3640 | + unsigned long ul, n; | |
3641 | + struct hlist_head *head; | |
3642 | + struct au_vdir_wh *tpos; | |
3643 | + struct hlist_node *pos; | |
3644 | + | |
3645 | + n = whlist->nh_num; | |
3646 | + head = whlist->nh_head; | |
3647 | + for (ul = 0; ul < n; ul++) { | |
3648 | + hlist_for_each_entry(tpos, pos, head, wh_hash) | |
3649 | + dpri("b%d, %.*s, %d\n", | |
3650 | + tpos->wh_bindex, | |
3651 | + tpos->wh_str.len, tpos->wh_str.name, | |
3652 | + tpos->wh_str.len); | |
3653 | + head++; | |
3654 | + } | |
3655 | +} | |
3656 | + | |
3657 | +void au_dpri_vdir(struct au_vdir *vdir) | |
3658 | +{ | |
3659 | + unsigned long ul; | |
3660 | + union au_vdir_deblk_p p; | |
3661 | + unsigned char *o; | |
3662 | + | |
3663 | + if (!vdir || IS_ERR(vdir)) { | |
3664 | + dpri("err %ld\n", PTR_ERR(vdir)); | |
3665 | + return; | |
3666 | + } | |
3667 | + | |
3668 | + dpri("deblk %u, nblk %lu, deblk %p, last{%lu, %p}, ver %lu\n", | |
3669 | + vdir->vd_deblk_sz, vdir->vd_nblk, vdir->vd_deblk, | |
3670 | + vdir->vd_last.ul, vdir->vd_last.p.deblk, vdir->vd_version); | |
3671 | + for (ul = 0; ul < vdir->vd_nblk; ul++) { | |
3672 | + p.deblk = vdir->vd_deblk[ul]; | |
3673 | + o = p.deblk; | |
3674 | + dpri("[%lu]: %p\n", ul, o); | |
3675 | + } | |
3676 | +} | |
3677 | + | |
3678 | +static int do_pri_inode(aufs_bindex_t bindex, struct inode *inode, | |
3679 | + struct dentry *wh) | |
3680 | +{ | |
3681 | + char *n = NULL; | |
3682 | + int l = 0; | |
3683 | + | |
3684 | + if (!inode || IS_ERR(inode)) { | |
3685 | + dpri("i%d: err %ld\n", bindex, PTR_ERR(inode)); | |
3686 | + return -1; | |
3687 | + } | |
3688 | + | |
3689 | + /* the type of i_blocks depends upon CONFIG_LSF */ | |
3690 | + BUILD_BUG_ON(sizeof(inode->i_blocks) != sizeof(unsigned long) | |
3691 | + && sizeof(inode->i_blocks) != sizeof(u64)); | |
3692 | + if (wh) { | |
3693 | + n = (void *)wh->d_name.name; | |
3694 | + l = wh->d_name.len; | |
3695 | + } | |
3696 | + | |
3697 | + dpri("i%d: i%lu, %s, cnt %d, nl %u, 0%o, sz %llu, blk %llu," | |
b752ccd1 | 3698 | + " ct %lld, np %lu, st 0x%lx, f 0x%x, v %llu, g %x%s%.*s\n", |
1facf9fc | 3699 | + bindex, |
3700 | + inode->i_ino, inode->i_sb ? au_sbtype(inode->i_sb) : "??", | |
3701 | + atomic_read(&inode->i_count), inode->i_nlink, inode->i_mode, | |
3702 | + i_size_read(inode), (unsigned long long)inode->i_blocks, | |
3703 | + (long long)timespec_to_ns(&inode->i_ctime) & 0x0ffff, | |
3704 | + inode->i_mapping ? inode->i_mapping->nrpages : 0, | |
b752ccd1 AM |
3705 | + inode->i_state, inode->i_flags, inode->i_version, |
3706 | + inode->i_generation, | |
1facf9fc | 3707 | + l ? ", wh " : "", l, n); |
3708 | + return 0; | |
3709 | +} | |
3710 | + | |
3711 | +void au_dpri_inode(struct inode *inode) | |
3712 | +{ | |
3713 | + struct au_iinfo *iinfo; | |
3714 | + aufs_bindex_t bindex; | |
3715 | + int err; | |
3716 | + | |
3717 | + err = do_pri_inode(-1, inode, NULL); | |
3718 | + if (err || !au_test_aufs(inode->i_sb)) | |
3719 | + return; | |
3720 | + | |
3721 | + iinfo = au_ii(inode); | |
3722 | + if (!iinfo) | |
3723 | + return; | |
3724 | + dpri("i-1: bstart %d, bend %d, gen %d\n", | |
3725 | + iinfo->ii_bstart, iinfo->ii_bend, au_iigen(inode)); | |
3726 | + if (iinfo->ii_bstart < 0) | |
3727 | + return; | |
3728 | + for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend; bindex++) | |
3729 | + do_pri_inode(bindex, iinfo->ii_hinode[0 + bindex].hi_inode, | |
3730 | + iinfo->ii_hinode[0 + bindex].hi_whdentry); | |
3731 | +} | |
3732 | + | |
3733 | +static int do_pri_dentry(aufs_bindex_t bindex, struct dentry *dentry) | |
3734 | +{ | |
3735 | + struct dentry *wh = NULL; | |
3736 | + | |
3737 | + if (!dentry || IS_ERR(dentry)) { | |
3738 | + dpri("d%d: err %ld\n", bindex, PTR_ERR(dentry)); | |
3739 | + return -1; | |
3740 | + } | |
3741 | + /* do not call dget_parent() here */ | |
3742 | + dpri("d%d: %.*s?/%.*s, %s, cnt %d, flags 0x%x\n", | |
3743 | + bindex, | |
3744 | + AuDLNPair(dentry->d_parent), AuDLNPair(dentry), | |
3745 | + dentry->d_sb ? au_sbtype(dentry->d_sb) : "??", | |
3746 | + atomic_read(&dentry->d_count), dentry->d_flags); | |
3747 | + if (bindex >= 0 && dentry->d_inode && au_test_aufs(dentry->d_sb)) { | |
3748 | + struct au_iinfo *iinfo = au_ii(dentry->d_inode); | |
3749 | + if (iinfo) | |
3750 | + wh = iinfo->ii_hinode[0 + bindex].hi_whdentry; | |
3751 | + } | |
3752 | + do_pri_inode(bindex, dentry->d_inode, wh); | |
3753 | + return 0; | |
3754 | +} | |
3755 | + | |
3756 | +void au_dpri_dentry(struct dentry *dentry) | |
3757 | +{ | |
3758 | + struct au_dinfo *dinfo; | |
3759 | + aufs_bindex_t bindex; | |
3760 | + int err; | |
4a4d8108 | 3761 | + struct au_hdentry *hdp; |
1facf9fc | 3762 | + |
3763 | + err = do_pri_dentry(-1, dentry); | |
3764 | + if (err || !au_test_aufs(dentry->d_sb)) | |
3765 | + return; | |
3766 | + | |
3767 | + dinfo = au_di(dentry); | |
3768 | + if (!dinfo) | |
3769 | + return; | |
3770 | + dpri("d-1: bstart %d, bend %d, bwh %d, bdiropq %d, gen %d\n", | |
3771 | + dinfo->di_bstart, dinfo->di_bend, | |
3772 | + dinfo->di_bwh, dinfo->di_bdiropq, au_digen(dentry)); | |
3773 | + if (dinfo->di_bstart < 0) | |
3774 | + return; | |
4a4d8108 | 3775 | + hdp = dinfo->di_hdentry; |
1facf9fc | 3776 | + for (bindex = dinfo->di_bstart; bindex <= dinfo->di_bend; bindex++) |
4a4d8108 | 3777 | + do_pri_dentry(bindex, hdp[0 + bindex].hd_dentry); |
1facf9fc | 3778 | +} |
3779 | + | |
3780 | +static int do_pri_file(aufs_bindex_t bindex, struct file *file) | |
3781 | +{ | |
3782 | + char a[32]; | |
3783 | + | |
3784 | + if (!file || IS_ERR(file)) { | |
3785 | + dpri("f%d: err %ld\n", bindex, PTR_ERR(file)); | |
3786 | + return -1; | |
3787 | + } | |
3788 | + a[0] = 0; | |
3789 | + if (bindex < 0 | |
3790 | + && file->f_dentry | |
3791 | + && au_test_aufs(file->f_dentry->d_sb) | |
3792 | + && au_fi(file)) | |
953406b4 AM |
3793 | + snprintf(a, sizeof(a), ", mmapped %d", |
3794 | + !!au_fi(file)->fi_hvmop); | |
b752ccd1 | 3795 | + dpri("f%d: mode 0x%x, flags 0%o, cnt %ld, v %llu, pos %llu%s\n", |
1facf9fc | 3796 | + bindex, file->f_mode, file->f_flags, (long)file_count(file), |
b752ccd1 | 3797 | + file->f_version, file->f_pos, a); |
1facf9fc | 3798 | + if (file->f_dentry) |
3799 | + do_pri_dentry(bindex, file->f_dentry); | |
3800 | + return 0; | |
3801 | +} | |
3802 | + | |
3803 | +void au_dpri_file(struct file *file) | |
3804 | +{ | |
3805 | + struct au_finfo *finfo; | |
4a4d8108 AM |
3806 | + struct au_fidir *fidir; |
3807 | + struct au_hfile *hfile; | |
1facf9fc | 3808 | + aufs_bindex_t bindex; |
3809 | + int err; | |
3810 | + | |
3811 | + err = do_pri_file(-1, file); | |
3812 | + if (err || !file->f_dentry || !au_test_aufs(file->f_dentry->d_sb)) | |
3813 | + return; | |
3814 | + | |
3815 | + finfo = au_fi(file); | |
3816 | + if (!finfo) | |
3817 | + return; | |
4a4d8108 | 3818 | + if (finfo->fi_btop < 0) |
1facf9fc | 3819 | + return; |
4a4d8108 AM |
3820 | + fidir = finfo->fi_hdir; |
3821 | + if (!fidir) | |
3822 | + do_pri_file(finfo->fi_btop, finfo->fi_htop.hf_file); | |
3823 | + else | |
953406b4 | 3824 | + for (bindex = finfo->fi_btop; bindex <= fidir->fd_bbot; |
4a4d8108 AM |
3825 | + bindex++) { |
3826 | + hfile = fidir->fd_hfile + bindex; | |
3827 | + do_pri_file(bindex, hfile ? hfile->hf_file : NULL); | |
3828 | + } | |
1facf9fc | 3829 | +} |
3830 | + | |
3831 | +static int do_pri_br(aufs_bindex_t bindex, struct au_branch *br) | |
3832 | +{ | |
3833 | + struct vfsmount *mnt; | |
3834 | + struct super_block *sb; | |
3835 | + | |
3836 | + if (!br || IS_ERR(br)) | |
3837 | + goto out; | |
3838 | + mnt = br->br_mnt; | |
3839 | + if (!mnt || IS_ERR(mnt)) | |
3840 | + goto out; | |
3841 | + sb = mnt->mnt_sb; | |
3842 | + if (!sb || IS_ERR(sb)) | |
3843 | + goto out; | |
3844 | + | |
3845 | + dpri("s%d: {perm 0x%x, cnt %d, wbr %p}, " | |
b752ccd1 | 3846 | + "%s, dev 0x%02x%02x, flags 0x%lx, cnt %d, active %d, " |
1facf9fc | 3847 | + "xino %d\n", |
3848 | + bindex, br->br_perm, atomic_read(&br->br_count), br->br_wbr, | |
3849 | + au_sbtype(sb), MAJOR(sb->s_dev), MINOR(sb->s_dev), | |
b752ccd1 | 3850 | + sb->s_flags, sb->s_count, |
1facf9fc | 3851 | + atomic_read(&sb->s_active), !!br->br_xino.xi_file); |
3852 | + return 0; | |
3853 | + | |
4f0767ce | 3854 | +out: |
1facf9fc | 3855 | + dpri("s%d: err %ld\n", bindex, PTR_ERR(br)); |
3856 | + return -1; | |
3857 | +} | |
3858 | + | |
3859 | +void au_dpri_sb(struct super_block *sb) | |
3860 | +{ | |
3861 | + struct au_sbinfo *sbinfo; | |
3862 | + aufs_bindex_t bindex; | |
3863 | + int err; | |
3864 | + /* to reuduce stack size */ | |
3865 | + struct { | |
3866 | + struct vfsmount mnt; | |
3867 | + struct au_branch fake; | |
3868 | + } *a; | |
3869 | + | |
3870 | + /* this function can be called from magic sysrq */ | |
3871 | + a = kzalloc(sizeof(*a), GFP_ATOMIC); | |
3872 | + if (unlikely(!a)) { | |
3873 | + dpri("no memory\n"); | |
3874 | + return; | |
3875 | + } | |
3876 | + | |
3877 | + a->mnt.mnt_sb = sb; | |
3878 | + a->fake.br_perm = 0; | |
3879 | + a->fake.br_mnt = &a->mnt; | |
3880 | + a->fake.br_xino.xi_file = NULL; | |
3881 | + atomic_set(&a->fake.br_count, 0); | |
3882 | + smp_mb(); /* atomic_set */ | |
3883 | + err = do_pri_br(-1, &a->fake); | |
3884 | + kfree(a); | |
3885 | + dpri("dev 0x%x\n", sb->s_dev); | |
3886 | + if (err || !au_test_aufs(sb)) | |
3887 | + return; | |
3888 | + | |
3889 | + sbinfo = au_sbi(sb); | |
3890 | + if (!sbinfo) | |
3891 | + return; | |
3892 | + dpri("nw %d, gen %u, kobj %d\n", | |
3893 | + atomic_read(&sbinfo->si_nowait.nw_len), sbinfo->si_generation, | |
3894 | + atomic_read(&sbinfo->si_kobj.kref.refcount)); | |
3895 | + for (bindex = 0; bindex <= sbinfo->si_bend; bindex++) | |
3896 | + do_pri_br(bindex, sbinfo->si_branch[0 + bindex]); | |
3897 | +} | |
3898 | + | |
3899 | +/* ---------------------------------------------------------------------- */ | |
3900 | + | |
3901 | +void au_dbg_sleep_jiffy(int jiffy) | |
3902 | +{ | |
3903 | + while (jiffy) | |
3904 | + jiffy = schedule_timeout_uninterruptible(jiffy); | |
3905 | +} | |
3906 | + | |
3907 | +void au_dbg_iattr(struct iattr *ia) | |
3908 | +{ | |
3909 | +#define AuBit(name) if (ia->ia_valid & ATTR_ ## name) \ | |
3910 | + dpri(#name "\n") | |
3911 | + AuBit(MODE); | |
3912 | + AuBit(UID); | |
3913 | + AuBit(GID); | |
3914 | + AuBit(SIZE); | |
3915 | + AuBit(ATIME); | |
3916 | + AuBit(MTIME); | |
3917 | + AuBit(CTIME); | |
3918 | + AuBit(ATIME_SET); | |
3919 | + AuBit(MTIME_SET); | |
3920 | + AuBit(FORCE); | |
3921 | + AuBit(ATTR_FLAG); | |
3922 | + AuBit(KILL_SUID); | |
3923 | + AuBit(KILL_SGID); | |
3924 | + AuBit(FILE); | |
3925 | + AuBit(KILL_PRIV); | |
3926 | + AuBit(OPEN); | |
3927 | + AuBit(TIMES_SET); | |
3928 | +#undef AuBit | |
3929 | + dpri("ia_file %p\n", ia->ia_file); | |
3930 | +} | |
3931 | + | |
3932 | +/* ---------------------------------------------------------------------- */ | |
3933 | + | |
3934 | +void au_dbg_verify_dir_parent(struct dentry *dentry, unsigned int sigen) | |
3935 | +{ | |
3936 | + struct dentry *parent; | |
3937 | + | |
3938 | + parent = dget_parent(dentry); | |
3939 | + AuDebugOn(!S_ISDIR(dentry->d_inode->i_mode) | |
3940 | + || IS_ROOT(dentry) | |
3941 | + || au_digen(parent) != sigen); | |
3942 | + dput(parent); | |
3943 | +} | |
3944 | + | |
3945 | +void au_dbg_verify_nondir_parent(struct dentry *dentry, unsigned int sigen) | |
3946 | +{ | |
3947 | + struct dentry *parent; | |
3948 | + | |
3949 | + parent = dget_parent(dentry); | |
3950 | + AuDebugOn(S_ISDIR(dentry->d_inode->i_mode) | |
3951 | + || au_digen(parent) != sigen); | |
3952 | + dput(parent); | |
3953 | +} | |
3954 | + | |
3955 | +void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen) | |
3956 | +{ | |
3957 | + int err, i, j; | |
3958 | + struct au_dcsub_pages dpages; | |
3959 | + struct au_dpage *dpage; | |
3960 | + struct dentry **dentries; | |
3961 | + | |
3962 | + err = au_dpages_init(&dpages, GFP_NOFS); | |
3963 | + AuDebugOn(err); | |
3964 | + err = au_dcsub_pages_rev(&dpages, parent, /*do_include*/1, NULL, NULL); | |
3965 | + AuDebugOn(err); | |
3966 | + for (i = dpages.ndpage - 1; !err && i >= 0; i--) { | |
3967 | + dpage = dpages.dpages + i; | |
3968 | + dentries = dpage->dentries; | |
3969 | + for (j = dpage->ndentry - 1; !err && j >= 0; j--) | |
3970 | + AuDebugOn(au_digen(dentries[j]) != sigen); | |
3971 | + } | |
3972 | + au_dpages_free(&dpages); | |
3973 | +} | |
3974 | + | |
1facf9fc | 3975 | +void au_dbg_verify_kthread(void) |
3976 | +{ | |
953406b4 | 3977 | + if (current->flags & PF_WQ_WORKER) { |
1facf9fc | 3978 | + au_dbg_blocked(); |
953406b4 | 3979 | + WARN_ON(1); |
1facf9fc | 3980 | + } |
3981 | +} | |
3982 | + | |
3983 | +/* ---------------------------------------------------------------------- */ | |
3984 | + | |
3985 | +void au_debug_sbinfo_init(struct au_sbinfo *sbinfo __maybe_unused) | |
3986 | +{ | |
3987 | +#ifdef AuForceNoPlink | |
3988 | + au_opt_clr(sbinfo->si_mntflags, PLINK); | |
3989 | +#endif | |
3990 | +#ifdef AuForceNoXino | |
3991 | + au_opt_clr(sbinfo->si_mntflags, XINO); | |
3992 | +#endif | |
3993 | +#ifdef AuForceNoRefrof | |
3994 | + au_opt_clr(sbinfo->si_mntflags, REFROF); | |
3995 | +#endif | |
4a4d8108 AM |
3996 | +#ifdef AuForceHnotify |
3997 | + au_opt_set_udba(sbinfo->si_mntflags, UDBA_HNOTIFY); | |
1facf9fc | 3998 | +#endif |
1308ab2a | 3999 | +#ifdef AuForceRd0 |
4000 | + sbinfo->si_rdblk = 0; | |
4001 | + sbinfo->si_rdhash = 0; | |
4002 | +#endif | |
1facf9fc | 4003 | +} |
4004 | + | |
4005 | +int __init au_debug_init(void) | |
4006 | +{ | |
4007 | + aufs_bindex_t bindex; | |
4008 | + struct au_vdir_destr destr; | |
4009 | + | |
4010 | + bindex = -1; | |
4011 | + AuDebugOn(bindex >= 0); | |
4012 | + | |
4013 | + destr.len = -1; | |
4014 | + AuDebugOn(destr.len < NAME_MAX); | |
4015 | + | |
4016 | +#ifdef CONFIG_4KSTACKS | |
4a4d8108 | 4017 | + pr_warning("CONFIG_4KSTACKS is defined.\n"); |
1facf9fc | 4018 | +#endif |
4019 | + | |
4020 | +#ifdef AuForceNoBrs | |
4021 | + sysaufs_brs = 0; | |
4022 | +#endif | |
4023 | + | |
4024 | + return 0; | |
4025 | +} | |
b752ccd1 AM |
4026 | diff -urN /usr/share/empty/fs/aufs/debug.h linux/fs/aufs/debug.h |
4027 | --- /usr/share/empty/fs/aufs/debug.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
4028 | +++ linux/fs/aufs/debug.h 2010-10-21 09:52:43.086957936 +0200 |
4029 | @@ -0,0 +1,243 @@ | |
1facf9fc | 4030 | +/* |
4a4d8108 | 4031 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 4032 | + * |
4033 | + * This program, aufs is free software; you can redistribute it and/or modify | |
4034 | + * it under the terms of the GNU General Public License as published by | |
4035 | + * the Free Software Foundation; either version 2 of the License, or | |
4036 | + * (at your option) any later version. | |
dece6358 AM |
4037 | + * |
4038 | + * This program is distributed in the hope that it will be useful, | |
4039 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
4040 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
4041 | + * GNU General Public License for more details. | |
4042 | + * | |
4043 | + * You should have received a copy of the GNU General Public License | |
4044 | + * along with this program; if not, write to the Free Software | |
4045 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 4046 | + */ |
4047 | + | |
4048 | +/* | |
4049 | + * debug print functions | |
4050 | + */ | |
4051 | + | |
4052 | +#ifndef __AUFS_DEBUG_H__ | |
4053 | +#define __AUFS_DEBUG_H__ | |
4054 | + | |
4055 | +#ifdef __KERNEL__ | |
4056 | + | |
1308ab2a | 4057 | +#include <asm/system.h> |
dece6358 AM |
4058 | +#include <linux/bug.h> |
4059 | +/* #include <linux/err.h> */ | |
1308ab2a | 4060 | +#include <linux/init.h> |
4a4d8108 AM |
4061 | +#include <linux/module.h> |
4062 | +#include <linux/kallsyms.h> | |
dece6358 | 4063 | +/* #include <linux/kernel.h> */ |
1facf9fc | 4064 | +#include <linux/delay.h> |
dece6358 | 4065 | +/* #include <linux/kd.h> */ |
4f0767ce | 4066 | +#include <linux/vt_kern.h> |
1facf9fc | 4067 | +#include <linux/sysrq.h> |
4068 | +#include <linux/aufs_type.h> | |
4069 | + | |
4a4d8108 AM |
4070 | +#include <asm/system.h> |
4071 | + | |
1facf9fc | 4072 | +#ifdef CONFIG_AUFS_DEBUG |
4073 | +#define AuDebugOn(a) BUG_ON(a) | |
4074 | + | |
4075 | +/* module parameter */ | |
4076 | +extern int aufs_debug; | |
4077 | +static inline void au_debug(int n) | |
4078 | +{ | |
4079 | + aufs_debug = n; | |
4080 | + smp_mb(); | |
4081 | +} | |
4082 | + | |
4083 | +static inline int au_debug_test(void) | |
4084 | +{ | |
4085 | + return aufs_debug; | |
4086 | +} | |
4087 | +#else | |
4088 | +#define AuDebugOn(a) do {} while (0) | |
4a4d8108 AM |
4089 | +AuStubVoid(au_debug, int n) |
4090 | +AuStubInt0(au_debug_test, void) | |
1facf9fc | 4091 | +#endif /* CONFIG_AUFS_DEBUG */ |
4092 | + | |
4093 | +/* ---------------------------------------------------------------------- */ | |
4094 | + | |
4095 | +/* debug print */ | |
4096 | + | |
4a4d8108 | 4097 | +#define AuDbg(fmt, ...) do { \ |
1facf9fc | 4098 | + if (au_debug_test()) \ |
4a4d8108 | 4099 | + pr_debug("DEBUG: " fmt, ##__VA_ARGS__); \ |
1facf9fc | 4100 | +} while (0) |
4a4d8108 AM |
4101 | +#define AuLabel(l) AuDbg(#l "\n") |
4102 | +#define AuIOErr(fmt, ...) pr_err("I/O Error, " fmt, ##__VA_ARGS__) | |
4103 | +#define AuWarn1(fmt, ...) do { \ | |
1facf9fc | 4104 | + static unsigned char _c; \ |
4105 | + if (!_c++) \ | |
4a4d8108 | 4106 | + pr_warning(fmt, ##__VA_ARGS__); \ |
1facf9fc | 4107 | +} while (0) |
4108 | + | |
4a4d8108 | 4109 | +#define AuErr1(fmt, ...) do { \ |
1facf9fc | 4110 | + static unsigned char _c; \ |
4111 | + if (!_c++) \ | |
4a4d8108 | 4112 | + pr_err(fmt, ##__VA_ARGS__); \ |
1facf9fc | 4113 | +} while (0) |
4114 | + | |
4a4d8108 | 4115 | +#define AuIOErr1(fmt, ...) do { \ |
1facf9fc | 4116 | + static unsigned char _c; \ |
4117 | + if (!_c++) \ | |
4a4d8108 | 4118 | + AuIOErr(fmt, ##__VA_ARGS__); \ |
1facf9fc | 4119 | +} while (0) |
4120 | + | |
4121 | +#define AuUnsupportMsg "This operation is not supported." \ | |
4122 | + " Please report this application to aufs-users ML." | |
4a4d8108 AM |
4123 | +#define AuUnsupport(fmt, ...) do { \ |
4124 | + pr_err(AuUnsupportMsg "\n" fmt, ##__VA_ARGS__); \ | |
1facf9fc | 4125 | + dump_stack(); \ |
4126 | +} while (0) | |
4127 | + | |
4128 | +#define AuTraceErr(e) do { \ | |
4129 | + if (unlikely((e) < 0)) \ | |
4130 | + AuDbg("err %d\n", (int)(e)); \ | |
4131 | +} while (0) | |
4132 | + | |
4133 | +#define AuTraceErrPtr(p) do { \ | |
4134 | + if (IS_ERR(p)) \ | |
4135 | + AuDbg("err %ld\n", PTR_ERR(p)); \ | |
4136 | +} while (0) | |
4137 | + | |
4138 | +/* dirty macros for debug print, use with "%.*s" and caution */ | |
4139 | +#define AuLNPair(qstr) (qstr)->len, (qstr)->name | |
4140 | +#define AuDLNPair(d) AuLNPair(&(d)->d_name) | |
4141 | + | |
4142 | +/* ---------------------------------------------------------------------- */ | |
4143 | + | |
4144 | +struct au_sbinfo; | |
4145 | +struct au_finfo; | |
dece6358 | 4146 | +struct dentry; |
1facf9fc | 4147 | +#ifdef CONFIG_AUFS_DEBUG |
4148 | +extern char *au_plevel; | |
4149 | +struct au_nhash; | |
4150 | +void au_dpri_whlist(struct au_nhash *whlist); | |
4151 | +struct au_vdir; | |
4152 | +void au_dpri_vdir(struct au_vdir *vdir); | |
dece6358 | 4153 | +struct inode; |
1facf9fc | 4154 | +void au_dpri_inode(struct inode *inode); |
4155 | +void au_dpri_dentry(struct dentry *dentry); | |
dece6358 | 4156 | +struct file; |
1facf9fc | 4157 | +void au_dpri_file(struct file *filp); |
dece6358 | 4158 | +struct super_block; |
1facf9fc | 4159 | +void au_dpri_sb(struct super_block *sb); |
4160 | + | |
4161 | +void au_dbg_sleep_jiffy(int jiffy); | |
dece6358 | 4162 | +struct iattr; |
1facf9fc | 4163 | +void au_dbg_iattr(struct iattr *ia); |
4164 | + | |
4165 | +void au_dbg_verify_dir_parent(struct dentry *dentry, unsigned int sigen); | |
4166 | +void au_dbg_verify_nondir_parent(struct dentry *dentry, unsigned int sigen); | |
4167 | +void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen); | |
1facf9fc | 4168 | +void au_dbg_verify_kthread(void); |
4169 | + | |
4170 | +int __init au_debug_init(void); | |
4171 | +void au_debug_sbinfo_init(struct au_sbinfo *sbinfo); | |
4172 | +#define AuDbgWhlist(w) do { \ | |
4173 | + AuDbg(#w "\n"); \ | |
4174 | + au_dpri_whlist(w); \ | |
4175 | +} while (0) | |
4176 | + | |
4177 | +#define AuDbgVdir(v) do { \ | |
4178 | + AuDbg(#v "\n"); \ | |
4179 | + au_dpri_vdir(v); \ | |
4180 | +} while (0) | |
4181 | + | |
4182 | +#define AuDbgInode(i) do { \ | |
4183 | + AuDbg(#i "\n"); \ | |
4184 | + au_dpri_inode(i); \ | |
4185 | +} while (0) | |
4186 | + | |
4187 | +#define AuDbgDentry(d) do { \ | |
4188 | + AuDbg(#d "\n"); \ | |
4189 | + au_dpri_dentry(d); \ | |
4190 | +} while (0) | |
4191 | + | |
4192 | +#define AuDbgFile(f) do { \ | |
4193 | + AuDbg(#f "\n"); \ | |
4194 | + au_dpri_file(f); \ | |
4195 | +} while (0) | |
4196 | + | |
4197 | +#define AuDbgSb(sb) do { \ | |
4198 | + AuDbg(#sb "\n"); \ | |
4199 | + au_dpri_sb(sb); \ | |
4200 | +} while (0) | |
4201 | + | |
4202 | +#define AuDbgSleep(sec) do { \ | |
4203 | + AuDbg("sleep %d sec\n", sec); \ | |
4204 | + ssleep(sec); \ | |
4205 | +} while (0) | |
4206 | + | |
4207 | +#define AuDbgSleepJiffy(jiffy) do { \ | |
4208 | + AuDbg("sleep %d jiffies\n", jiffy); \ | |
4209 | + au_dbg_sleep_jiffy(jiffy); \ | |
4210 | +} while (0) | |
4211 | + | |
4212 | +#define AuDbgIAttr(ia) do { \ | |
4213 | + AuDbg("ia_valid 0x%x\n", (ia)->ia_valid); \ | |
4214 | + au_dbg_iattr(ia); \ | |
4215 | +} while (0) | |
4a4d8108 AM |
4216 | + |
4217 | +#define AuDbgSym(addr) do { \ | |
4218 | + char sym[KSYM_SYMBOL_LEN]; \ | |
4219 | + sprint_symbol(sym, (unsigned long)addr); \ | |
4220 | + AuDbg("%s\n", sym); \ | |
4221 | +} while (0) | |
4222 | + | |
4223 | +#define AuInfoSym(addr) do { \ | |
4224 | + char sym[KSYM_SYMBOL_LEN]; \ | |
4225 | + sprint_symbol(sym, (unsigned long)addr); \ | |
4226 | + AuInfo("%s\n", sym); \ | |
4227 | +} while (0) | |
1facf9fc | 4228 | +#else |
4a4d8108 AM |
4229 | +AuStubVoid(au_dbg_verify_dir_parent, struct dentry *dentry, unsigned int sigen) |
4230 | +AuStubVoid(au_dbg_verify_nondir_parent, struct dentry *dentry, | |
4231 | + unsigned int sigen) | |
4232 | +AuStubVoid(au_dbg_verify_gen, struct dentry *parent, unsigned int sigen) | |
4233 | +AuStubVoid(au_dbg_verify_kthread, void) | |
4234 | +AuStubInt0(__init au_debug_init, void) | |
4235 | +AuStubVoid(au_debug_sbinfo_init, struct au_sbinfo *sbinfo) | |
1facf9fc | 4236 | + |
1facf9fc | 4237 | +#define AuDbgWhlist(w) do {} while (0) |
4238 | +#define AuDbgVdir(v) do {} while (0) | |
4239 | +#define AuDbgInode(i) do {} while (0) | |
4240 | +#define AuDbgDentry(d) do {} while (0) | |
4241 | +#define AuDbgFile(f) do {} while (0) | |
4242 | +#define AuDbgSb(sb) do {} while (0) | |
4243 | +#define AuDbgSleep(sec) do {} while (0) | |
4244 | +#define AuDbgSleepJiffy(jiffy) do {} while (0) | |
4245 | +#define AuDbgIAttr(ia) do {} while (0) | |
4a4d8108 AM |
4246 | +#define AuDbgSym(addr) do {} while (0) |
4247 | +#define AuInfoSym(addr) do {} while (0) | |
1facf9fc | 4248 | +#endif /* CONFIG_AUFS_DEBUG */ |
4249 | + | |
4250 | +/* ---------------------------------------------------------------------- */ | |
4251 | + | |
4252 | +#ifdef CONFIG_AUFS_MAGIC_SYSRQ | |
4253 | +int __init au_sysrq_init(void); | |
4254 | +void au_sysrq_fin(void); | |
4255 | + | |
4256 | +#ifdef CONFIG_HW_CONSOLE | |
4257 | +#define au_dbg_blocked() do { \ | |
4258 | + WARN_ON(1); \ | |
953406b4 | 4259 | + handle_sysrq('w', vc_cons[fg_console].d->port.tty); \ |
1facf9fc | 4260 | +} while (0) |
4261 | +#else | |
4a4d8108 | 4262 | +AuStubVoid(au_dbg_blocked, void) |
1facf9fc | 4263 | +#endif |
4264 | + | |
4265 | +#else | |
4a4d8108 AM |
4266 | +AuStubInt0(__init au_sysrq_init, void) |
4267 | +AuStubVoid(au_sysrq_fin, void) | |
4268 | +AuStubVoid(au_dbg_blocked, void) | |
1facf9fc | 4269 | +#endif /* CONFIG_AUFS_MAGIC_SYSRQ */ |
4270 | + | |
4271 | +#endif /* __KERNEL__ */ | |
4272 | +#endif /* __AUFS_DEBUG_H__ */ | |
b752ccd1 AM |
4273 | diff -urN /usr/share/empty/fs/aufs/dentry.c linux/fs/aufs/dentry.c |
4274 | --- /usr/share/empty/fs/aufs/dentry.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
4275 | +++ linux/fs/aufs/dentry.c 2010-10-21 09:52:43.086957936 +0200 |
4276 | @@ -0,0 +1,851 @@ | |
1facf9fc | 4277 | +/* |
4a4d8108 | 4278 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 4279 | + * |
4280 | + * This program, aufs is free software; you can redistribute it and/or modify | |
4281 | + * it under the terms of the GNU General Public License as published by | |
4282 | + * the Free Software Foundation; either version 2 of the License, or | |
4283 | + * (at your option) any later version. | |
dece6358 AM |
4284 | + * |
4285 | + * This program is distributed in the hope that it will be useful, | |
4286 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
4287 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
4288 | + * GNU General Public License for more details. | |
4289 | + * | |
4290 | + * You should have received a copy of the GNU General Public License | |
4291 | + * along with this program; if not, write to the Free Software | |
4292 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 4293 | + */ |
4294 | + | |
4295 | +/* | |
4296 | + * lookup and dentry operations | |
4297 | + */ | |
4298 | + | |
dece6358 | 4299 | +#include <linux/namei.h> |
1facf9fc | 4300 | +#include "aufs.h" |
4301 | + | |
4302 | +static void au_h_nd(struct nameidata *h_nd, struct nameidata *nd) | |
4303 | +{ | |
4304 | + if (nd) { | |
4305 | + *h_nd = *nd; | |
4306 | + | |
4307 | + /* | |
4308 | + * gave up supporting LOOKUP_CREATE/OPEN for lower fs, | |
4309 | + * due to whiteout and branch permission. | |
4310 | + */ | |
4311 | + h_nd->flags &= ~(/*LOOKUP_PARENT |*/ LOOKUP_OPEN | LOOKUP_CREATE | |
b752ccd1 | 4312 | + | LOOKUP_FOLLOW | LOOKUP_EXCL); |
1facf9fc | 4313 | + /* unnecessary? */ |
4314 | + h_nd->intent.open.file = NULL; | |
4315 | + } else | |
4316 | + memset(h_nd, 0, sizeof(*h_nd)); | |
4317 | +} | |
4318 | + | |
4319 | +struct au_lkup_one_args { | |
4320 | + struct dentry **errp; | |
4321 | + struct qstr *name; | |
4322 | + struct dentry *h_parent; | |
4323 | + struct au_branch *br; | |
4324 | + struct nameidata *nd; | |
4325 | +}; | |
4326 | + | |
4327 | +struct dentry *au_lkup_one(struct qstr *name, struct dentry *h_parent, | |
4328 | + struct au_branch *br, struct nameidata *nd) | |
4329 | +{ | |
4330 | + struct dentry *h_dentry; | |
4331 | + int err; | |
4332 | + struct nameidata h_nd; | |
4333 | + | |
4334 | + if (au_test_fs_null_nd(h_parent->d_sb)) | |
4335 | + return vfsub_lookup_one_len(name->name, h_parent, name->len); | |
4336 | + | |
4337 | + au_h_nd(&h_nd, nd); | |
4338 | + h_nd.path.dentry = h_parent; | |
4339 | + h_nd.path.mnt = br->br_mnt; | |
4340 | + | |
4341 | + err = __lookup_one_len(name->name, &h_nd.last, NULL, name->len); | |
4342 | + h_dentry = ERR_PTR(err); | |
4343 | + if (!err) { | |
4344 | + path_get(&h_nd.path); | |
4345 | + h_dentry = vfsub_lookup_hash(&h_nd); | |
4346 | + path_put(&h_nd.path); | |
4347 | + } | |
4348 | + | |
4a4d8108 | 4349 | + AuTraceErrPtr(h_dentry); |
1facf9fc | 4350 | + return h_dentry; |
4351 | +} | |
4352 | + | |
4353 | +static void au_call_lkup_one(void *args) | |
4354 | +{ | |
4355 | + struct au_lkup_one_args *a = args; | |
4356 | + *a->errp = au_lkup_one(a->name, a->h_parent, a->br, a->nd); | |
4357 | +} | |
4358 | + | |
4359 | +#define AuLkup_ALLOW_NEG 1 | |
4360 | +#define au_ftest_lkup(flags, name) ((flags) & AuLkup_##name) | |
4361 | +#define au_fset_lkup(flags, name) { (flags) |= AuLkup_##name; } | |
4362 | +#define au_fclr_lkup(flags, name) { (flags) &= ~AuLkup_##name; } | |
4363 | + | |
4364 | +struct au_do_lookup_args { | |
4365 | + unsigned int flags; | |
4366 | + mode_t type; | |
4367 | + struct nameidata *nd; | |
4368 | +}; | |
4369 | + | |
4370 | +/* | |
4371 | + * returns positive/negative dentry, NULL or an error. | |
4372 | + * NULL means whiteout-ed or not-found. | |
4373 | + */ | |
4374 | +static struct dentry* | |
4375 | +au_do_lookup(struct dentry *h_parent, struct dentry *dentry, | |
4376 | + aufs_bindex_t bindex, struct qstr *wh_name, | |
4377 | + struct au_do_lookup_args *args) | |
4378 | +{ | |
4379 | + struct dentry *h_dentry; | |
4380 | + struct inode *h_inode, *inode; | |
1facf9fc | 4381 | + struct au_branch *br; |
4382 | + int wh_found, opq; | |
4383 | + unsigned char wh_able; | |
4384 | + const unsigned char allow_neg = !!au_ftest_lkup(args->flags, ALLOW_NEG); | |
4385 | + | |
1facf9fc | 4386 | + wh_found = 0; |
4387 | + br = au_sbr(dentry->d_sb, bindex); | |
4388 | + wh_able = !!au_br_whable(br->br_perm); | |
4389 | + if (wh_able) | |
4390 | + wh_found = au_wh_test(h_parent, wh_name, br, /*try_sio*/0); | |
4391 | + h_dentry = ERR_PTR(wh_found); | |
4392 | + if (!wh_found) | |
4393 | + goto real_lookup; | |
4394 | + if (unlikely(wh_found < 0)) | |
4395 | + goto out; | |
4396 | + | |
4397 | + /* We found a whiteout */ | |
4398 | + /* au_set_dbend(dentry, bindex); */ | |
4399 | + au_set_dbwh(dentry, bindex); | |
4400 | + if (!allow_neg) | |
4401 | + return NULL; /* success */ | |
4402 | + | |
4f0767ce | 4403 | +real_lookup: |
4a4d8108 | 4404 | + h_dentry = au_lkup_one(&dentry->d_name, h_parent, br, args->nd); |
1facf9fc | 4405 | + if (IS_ERR(h_dentry)) |
4406 | + goto out; | |
4407 | + | |
4408 | + h_inode = h_dentry->d_inode; | |
4409 | + if (!h_inode) { | |
4410 | + if (!allow_neg) | |
4411 | + goto out_neg; | |
4412 | + } else if (wh_found | |
4413 | + || (args->type && args->type != (h_inode->i_mode & S_IFMT))) | |
4414 | + goto out_neg; | |
4415 | + | |
4416 | + if (au_dbend(dentry) <= bindex) | |
4417 | + au_set_dbend(dentry, bindex); | |
4418 | + if (au_dbstart(dentry) < 0 || bindex < au_dbstart(dentry)) | |
4419 | + au_set_dbstart(dentry, bindex); | |
4420 | + au_set_h_dptr(dentry, bindex, h_dentry); | |
4421 | + | |
4422 | + inode = dentry->d_inode; | |
4423 | + if (!h_inode || !S_ISDIR(h_inode->i_mode) || !wh_able | |
4424 | + || (inode && !S_ISDIR(inode->i_mode))) | |
4425 | + goto out; /* success */ | |
4426 | + | |
4427 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); | |
4428 | + opq = au_diropq_test(h_dentry, br); | |
4429 | + mutex_unlock(&h_inode->i_mutex); | |
4430 | + if (opq > 0) | |
4431 | + au_set_dbdiropq(dentry, bindex); | |
4432 | + else if (unlikely(opq < 0)) { | |
4433 | + au_set_h_dptr(dentry, bindex, NULL); | |
4434 | + h_dentry = ERR_PTR(opq); | |
4435 | + } | |
4436 | + goto out; | |
4437 | + | |
4f0767ce | 4438 | +out_neg: |
1facf9fc | 4439 | + dput(h_dentry); |
4440 | + h_dentry = NULL; | |
4f0767ce | 4441 | +out: |
1facf9fc | 4442 | + return h_dentry; |
4443 | +} | |
4444 | + | |
dece6358 AM |
4445 | +static int au_test_shwh(struct super_block *sb, const struct qstr *name) |
4446 | +{ | |
4447 | + if (unlikely(!au_opt_test(au_mntflags(sb), SHWH) | |
4448 | + && !strncmp(name->name, AUFS_WH_PFX, AUFS_WH_PFX_LEN))) | |
4449 | + return -EPERM; | |
4450 | + return 0; | |
4451 | +} | |
4452 | + | |
1facf9fc | 4453 | +/* |
4454 | + * returns the number of lower positive dentries, | |
4455 | + * otherwise an error. | |
4456 | + * can be called at unlinking with @type is zero. | |
4457 | + */ | |
4458 | +int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type, | |
4459 | + struct nameidata *nd) | |
4460 | +{ | |
4461 | + int npositive, err; | |
4462 | + aufs_bindex_t bindex, btail, bdiropq; | |
4463 | + unsigned char isdir; | |
4464 | + struct qstr whname; | |
4465 | + struct au_do_lookup_args args = { | |
4466 | + .flags = 0, | |
4467 | + .type = type, | |
4468 | + .nd = nd | |
4469 | + }; | |
4470 | + const struct qstr *name = &dentry->d_name; | |
4471 | + struct dentry *parent; | |
4472 | + struct inode *inode; | |
4473 | + | |
dece6358 AM |
4474 | + err = au_test_shwh(dentry->d_sb, name); |
4475 | + if (unlikely(err)) | |
1facf9fc | 4476 | + goto out; |
4477 | + | |
4478 | + err = au_wh_name_alloc(&whname, name); | |
4479 | + if (unlikely(err)) | |
4480 | + goto out; | |
4481 | + | |
4482 | + inode = dentry->d_inode; | |
4483 | + isdir = !!(inode && S_ISDIR(inode->i_mode)); | |
4484 | + if (!type) | |
4485 | + au_fset_lkup(args.flags, ALLOW_NEG); | |
4486 | + | |
4487 | + npositive = 0; | |
4a4d8108 | 4488 | + parent = dget_parent(dentry); |
1facf9fc | 4489 | + btail = au_dbtaildir(parent); |
4490 | + for (bindex = bstart; bindex <= btail; bindex++) { | |
4491 | + struct dentry *h_parent, *h_dentry; | |
4492 | + struct inode *h_inode, *h_dir; | |
4493 | + | |
4494 | + h_dentry = au_h_dptr(dentry, bindex); | |
4495 | + if (h_dentry) { | |
4496 | + if (h_dentry->d_inode) | |
4497 | + npositive++; | |
4498 | + if (type != S_IFDIR) | |
4499 | + break; | |
4500 | + continue; | |
4501 | + } | |
4502 | + h_parent = au_h_dptr(parent, bindex); | |
4503 | + if (!h_parent) | |
4504 | + continue; | |
4505 | + h_dir = h_parent->d_inode; | |
4506 | + if (!h_dir || !S_ISDIR(h_dir->i_mode)) | |
4507 | + continue; | |
4508 | + | |
4509 | + mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT); | |
4510 | + h_dentry = au_do_lookup(h_parent, dentry, bindex, &whname, | |
4511 | + &args); | |
4512 | + mutex_unlock(&h_dir->i_mutex); | |
4513 | + err = PTR_ERR(h_dentry); | |
4514 | + if (IS_ERR(h_dentry)) | |
4a4d8108 | 4515 | + goto out_parent; |
1facf9fc | 4516 | + au_fclr_lkup(args.flags, ALLOW_NEG); |
4517 | + | |
4518 | + if (au_dbwh(dentry) >= 0) | |
4519 | + break; | |
4520 | + if (!h_dentry) | |
4521 | + continue; | |
4522 | + h_inode = h_dentry->d_inode; | |
4523 | + if (!h_inode) | |
4524 | + continue; | |
4525 | + npositive++; | |
4526 | + if (!args.type) | |
4527 | + args.type = h_inode->i_mode & S_IFMT; | |
4528 | + if (args.type != S_IFDIR) | |
4529 | + break; | |
4530 | + else if (isdir) { | |
4531 | + /* the type of lower may be different */ | |
4532 | + bdiropq = au_dbdiropq(dentry); | |
4533 | + if (bdiropq >= 0 && bdiropq <= bindex) | |
4534 | + break; | |
4535 | + } | |
4536 | + } | |
4537 | + | |
4538 | + if (npositive) { | |
4539 | + AuLabel(positive); | |
4540 | + au_update_dbstart(dentry); | |
4541 | + } | |
4542 | + err = npositive; | |
4543 | + if (unlikely(!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE) | |
4544 | + && au_dbstart(dentry) < 0)) | |
4545 | + /* both of real entry and whiteout found */ | |
4546 | + err = -EIO; | |
4547 | + | |
4f0767ce | 4548 | +out_parent: |
4a4d8108 | 4549 | + dput(parent); |
1facf9fc | 4550 | + kfree(whname.name); |
4f0767ce | 4551 | +out: |
1facf9fc | 4552 | + return err; |
4553 | +} | |
4554 | + | |
4555 | +struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent, | |
4556 | + struct au_branch *br) | |
4557 | +{ | |
4558 | + struct dentry *dentry; | |
4559 | + int wkq_err; | |
4560 | + | |
4561 | + if (!au_test_h_perm_sio(parent->d_inode, MAY_EXEC)) | |
4562 | + dentry = au_lkup_one(name, parent, br, /*nd*/NULL); | |
4563 | + else { | |
4564 | + struct au_lkup_one_args args = { | |
4565 | + .errp = &dentry, | |
4566 | + .name = name, | |
4567 | + .h_parent = parent, | |
4568 | + .br = br, | |
4569 | + .nd = NULL | |
4570 | + }; | |
4571 | + | |
4572 | + wkq_err = au_wkq_wait(au_call_lkup_one, &args); | |
4573 | + if (unlikely(wkq_err)) | |
4574 | + dentry = ERR_PTR(wkq_err); | |
4575 | + } | |
4576 | + | |
4577 | + return dentry; | |
4578 | +} | |
4579 | + | |
4580 | +/* | |
4581 | + * lookup @dentry on @bindex which should be negative. | |
4582 | + */ | |
4583 | +int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex) | |
4584 | +{ | |
4585 | + int err; | |
4586 | + struct dentry *parent, *h_parent, *h_dentry; | |
1facf9fc | 4587 | + |
1facf9fc | 4588 | + parent = dget_parent(dentry); |
4589 | + h_parent = au_h_dptr(parent, bindex); | |
4a4d8108 | 4590 | + h_dentry = au_sio_lkup_one(&dentry->d_name, h_parent, |
1facf9fc | 4591 | + au_sbr(dentry->d_sb, bindex)); |
4592 | + err = PTR_ERR(h_dentry); | |
4593 | + if (IS_ERR(h_dentry)) | |
4594 | + goto out; | |
4595 | + if (unlikely(h_dentry->d_inode)) { | |
4596 | + err = -EIO; | |
4597 | + AuIOErr("b%d %.*s should be negative.\n", | |
4598 | + bindex, AuDLNPair(h_dentry)); | |
4599 | + dput(h_dentry); | |
4600 | + goto out; | |
4601 | + } | |
4602 | + | |
4a4d8108 | 4603 | + err = 0; |
1facf9fc | 4604 | + if (bindex < au_dbstart(dentry)) |
4605 | + au_set_dbstart(dentry, bindex); | |
4606 | + if (au_dbend(dentry) < bindex) | |
4607 | + au_set_dbend(dentry, bindex); | |
4608 | + au_set_h_dptr(dentry, bindex, h_dentry); | |
1facf9fc | 4609 | + |
4f0767ce | 4610 | +out: |
1facf9fc | 4611 | + dput(parent); |
4612 | + return err; | |
4613 | +} | |
4614 | + | |
4615 | +/* ---------------------------------------------------------------------- */ | |
4616 | + | |
4617 | +/* subset of struct inode */ | |
4618 | +struct au_iattr { | |
4619 | + unsigned long i_ino; | |
4620 | + /* unsigned int i_nlink; */ | |
4621 | + uid_t i_uid; | |
4622 | + gid_t i_gid; | |
4623 | + u64 i_version; | |
4624 | +/* | |
4625 | + loff_t i_size; | |
4626 | + blkcnt_t i_blocks; | |
4627 | +*/ | |
4628 | + umode_t i_mode; | |
4629 | +}; | |
4630 | + | |
4631 | +static void au_iattr_save(struct au_iattr *ia, struct inode *h_inode) | |
4632 | +{ | |
4633 | + ia->i_ino = h_inode->i_ino; | |
4634 | + /* ia->i_nlink = h_inode->i_nlink; */ | |
4635 | + ia->i_uid = h_inode->i_uid; | |
4636 | + ia->i_gid = h_inode->i_gid; | |
4637 | + ia->i_version = h_inode->i_version; | |
4638 | +/* | |
4639 | + ia->i_size = h_inode->i_size; | |
4640 | + ia->i_blocks = h_inode->i_blocks; | |
4641 | +*/ | |
4642 | + ia->i_mode = (h_inode->i_mode & S_IFMT); | |
4643 | +} | |
4644 | + | |
4645 | +static int au_iattr_test(struct au_iattr *ia, struct inode *h_inode) | |
4646 | +{ | |
4647 | + return ia->i_ino != h_inode->i_ino | |
4648 | + /* || ia->i_nlink != h_inode->i_nlink */ | |
4649 | + || ia->i_uid != h_inode->i_uid | |
4650 | + || ia->i_gid != h_inode->i_gid | |
4651 | + || ia->i_version != h_inode->i_version | |
4652 | +/* | |
4653 | + || ia->i_size != h_inode->i_size | |
4654 | + || ia->i_blocks != h_inode->i_blocks | |
4655 | +*/ | |
4656 | + || ia->i_mode != (h_inode->i_mode & S_IFMT); | |
4657 | +} | |
4658 | + | |
4659 | +static int au_h_verify_dentry(struct dentry *h_dentry, struct dentry *h_parent, | |
4660 | + struct au_branch *br) | |
4661 | +{ | |
4662 | + int err; | |
4663 | + struct au_iattr ia; | |
4664 | + struct inode *h_inode; | |
4665 | + struct dentry *h_d; | |
4666 | + struct super_block *h_sb; | |
4667 | + | |
4668 | + err = 0; | |
4669 | + memset(&ia, -1, sizeof(ia)); | |
4670 | + h_sb = h_dentry->d_sb; | |
4671 | + h_inode = h_dentry->d_inode; | |
4672 | + if (h_inode) | |
4673 | + au_iattr_save(&ia, h_inode); | |
4674 | + else if (au_test_nfs(h_sb) || au_test_fuse(h_sb)) | |
4675 | + /* nfs d_revalidate may return 0 for negative dentry */ | |
4676 | + /* fuse d_revalidate always return 0 for negative dentry */ | |
4677 | + goto out; | |
4678 | + | |
4679 | + /* main purpose is namei.c:cached_lookup() and d_revalidate */ | |
4680 | + h_d = au_lkup_one(&h_dentry->d_name, h_parent, br, /*nd*/NULL); | |
4681 | + err = PTR_ERR(h_d); | |
4682 | + if (IS_ERR(h_d)) | |
4683 | + goto out; | |
4684 | + | |
4685 | + err = 0; | |
4686 | + if (unlikely(h_d != h_dentry | |
4687 | + || h_d->d_inode != h_inode | |
4688 | + || (h_inode && au_iattr_test(&ia, h_inode)))) | |
4689 | + err = au_busy_or_stale(); | |
4690 | + dput(h_d); | |
4691 | + | |
4f0767ce | 4692 | +out: |
1facf9fc | 4693 | + AuTraceErr(err); |
4694 | + return err; | |
4695 | +} | |
4696 | + | |
4697 | +int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir, | |
4698 | + struct dentry *h_parent, struct au_branch *br) | |
4699 | +{ | |
4700 | + int err; | |
4701 | + | |
4702 | + err = 0; | |
4703 | + if (udba == AuOpt_UDBA_REVAL) { | |
4704 | + IMustLock(h_dir); | |
4705 | + err = (h_dentry->d_parent->d_inode != h_dir); | |
4a4d8108 | 4706 | + } else if (udba == AuOpt_UDBA_HNOTIFY) |
1facf9fc | 4707 | + err = au_h_verify_dentry(h_dentry, h_parent, br); |
4708 | + | |
4709 | + return err; | |
4710 | +} | |
4711 | + | |
4712 | +/* ---------------------------------------------------------------------- */ | |
4713 | + | |
4714 | +static void au_do_refresh_hdentry(struct au_hdentry *p, struct au_dinfo *dinfo, | |
4715 | + struct dentry *parent) | |
4716 | +{ | |
4717 | + struct dentry *h_d, *h_dp; | |
4718 | + struct au_hdentry tmp, *q; | |
4719 | + struct super_block *sb; | |
4720 | + aufs_bindex_t new_bindex, bindex, bend, bwh, bdiropq; | |
4721 | + | |
1308ab2a | 4722 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
4723 | + | |
1facf9fc | 4724 | + bend = dinfo->di_bend; |
4725 | + bwh = dinfo->di_bwh; | |
4726 | + bdiropq = dinfo->di_bdiropq; | |
4727 | + for (bindex = dinfo->di_bstart; bindex <= bend; bindex++, p++) { | |
4728 | + h_d = p->hd_dentry; | |
4729 | + if (!h_d) | |
4730 | + continue; | |
4731 | + | |
4732 | + h_dp = dget_parent(h_d); | |
4733 | + if (h_dp == au_h_dptr(parent, bindex)) { | |
4734 | + dput(h_dp); | |
4735 | + continue; | |
4736 | + } | |
4737 | + | |
4738 | + new_bindex = au_find_dbindex(parent, h_dp); | |
4739 | + dput(h_dp); | |
4740 | + if (dinfo->di_bwh == bindex) | |
4741 | + bwh = new_bindex; | |
4742 | + if (dinfo->di_bdiropq == bindex) | |
4743 | + bdiropq = new_bindex; | |
4744 | + if (new_bindex < 0) { | |
4745 | + au_hdput(p); | |
4746 | + p->hd_dentry = NULL; | |
4747 | + continue; | |
4748 | + } | |
4749 | + | |
4750 | + /* swap two lower dentries, and loop again */ | |
4751 | + q = dinfo->di_hdentry + new_bindex; | |
4752 | + tmp = *q; | |
4753 | + *q = *p; | |
4754 | + *p = tmp; | |
4755 | + if (tmp.hd_dentry) { | |
4756 | + bindex--; | |
4757 | + p--; | |
4758 | + } | |
4759 | + } | |
4760 | + | |
4761 | + sb = parent->d_sb; | |
4762 | + dinfo->di_bwh = -1; | |
4763 | + if (bwh >= 0 && bwh <= au_sbend(sb) && au_sbr_whable(sb, bwh)) | |
4764 | + dinfo->di_bwh = bwh; | |
4765 | + | |
4766 | + dinfo->di_bdiropq = -1; | |
4767 | + if (bdiropq >= 0 | |
4768 | + && bdiropq <= au_sbend(sb) | |
4769 | + && au_sbr_whable(sb, bdiropq)) | |
4770 | + dinfo->di_bdiropq = bdiropq; | |
4771 | + | |
4772 | + bend = au_dbend(parent); | |
4773 | + p = dinfo->di_hdentry; | |
4774 | + for (bindex = 0; bindex <= bend; bindex++, p++) | |
4775 | + if (p->hd_dentry) { | |
4776 | + dinfo->di_bstart = bindex; | |
4777 | + break; | |
4778 | + } | |
4779 | + | |
4780 | + p = dinfo->di_hdentry + bend; | |
4781 | + for (bindex = bend; bindex >= 0; bindex--, p--) | |
4782 | + if (p->hd_dentry) { | |
4783 | + dinfo->di_bend = bindex; | |
4784 | + break; | |
4785 | + } | |
4786 | +} | |
4787 | + | |
4788 | +/* | |
4789 | + * returns the number of found lower positive dentries, | |
4790 | + * otherwise an error. | |
4791 | + */ | |
4792 | +int au_refresh_hdentry(struct dentry *dentry, mode_t type) | |
4793 | +{ | |
4794 | + int npositive, err; | |
4795 | + unsigned int sigen; | |
4796 | + aufs_bindex_t bstart; | |
4797 | + struct au_dinfo *dinfo; | |
4798 | + struct super_block *sb; | |
4799 | + struct dentry *parent; | |
4800 | + | |
1308ab2a | 4801 | + DiMustWriteLock(dentry); |
4802 | + | |
1facf9fc | 4803 | + sb = dentry->d_sb; |
4804 | + AuDebugOn(IS_ROOT(dentry)); | |
4805 | + sigen = au_sigen(sb); | |
4806 | + parent = dget_parent(dentry); | |
4807 | + AuDebugOn(au_digen(parent) != sigen | |
4808 | + || au_iigen(parent->d_inode) != sigen); | |
4809 | + | |
4810 | + dinfo = au_di(dentry); | |
4811 | + err = au_di_realloc(dinfo, au_sbend(sb) + 1); | |
4812 | + npositive = err; | |
4813 | + if (unlikely(err)) | |
4814 | + goto out; | |
4815 | + au_do_refresh_hdentry(dinfo->di_hdentry + dinfo->di_bstart, dinfo, | |
4816 | + parent); | |
4817 | + | |
4818 | + npositive = 0; | |
4819 | + bstart = au_dbstart(parent); | |
4820 | + if (type != S_IFDIR && dinfo->di_bstart == bstart) | |
4821 | + goto out_dgen; /* success */ | |
4822 | + | |
4823 | + npositive = au_lkup_dentry(dentry, bstart, type, /*nd*/NULL); | |
4824 | + if (npositive < 0) | |
4825 | + goto out; | |
4826 | + if (dinfo->di_bwh >= 0 && dinfo->di_bwh <= dinfo->di_bstart) | |
4827 | + d_drop(dentry); | |
4828 | + | |
4f0767ce | 4829 | +out_dgen: |
1facf9fc | 4830 | + au_update_digen(dentry); |
4f0767ce | 4831 | +out: |
1facf9fc | 4832 | + dput(parent); |
4833 | + AuTraceErr(npositive); | |
4834 | + return npositive; | |
4835 | +} | |
4836 | + | |
4837 | +static noinline_for_stack | |
4838 | +int au_do_h_d_reval(struct dentry *h_dentry, struct nameidata *nd, | |
4839 | + struct dentry *dentry, aufs_bindex_t bindex) | |
4840 | +{ | |
4841 | + int err, valid; | |
4842 | + int (*reval)(struct dentry *, struct nameidata *); | |
4843 | + | |
4844 | + err = 0; | |
4845 | + reval = NULL; | |
4846 | + if (h_dentry->d_op) | |
4847 | + reval = h_dentry->d_op->d_revalidate; | |
4848 | + if (!reval) | |
4849 | + goto out; | |
4850 | + | |
4851 | + AuDbg("b%d\n", bindex); | |
4852 | + if (au_test_fs_null_nd(h_dentry->d_sb)) | |
4853 | + /* it may return tri-state */ | |
4854 | + valid = reval(h_dentry, NULL); | |
4855 | + else { | |
4856 | + struct nameidata h_nd; | |
4857 | + int locked; | |
4858 | + struct dentry *parent; | |
4859 | + | |
4860 | + au_h_nd(&h_nd, nd); | |
4861 | + parent = nd->path.dentry; | |
4862 | + locked = (nd && nd->path.dentry != dentry); | |
4863 | + if (locked) | |
4864 | + di_read_lock_parent(parent, AuLock_IR); | |
4865 | + BUG_ON(bindex > au_dbend(parent)); | |
4866 | + h_nd.path.dentry = au_h_dptr(parent, bindex); | |
4867 | + BUG_ON(!h_nd.path.dentry); | |
4868 | + h_nd.path.mnt = au_sbr(parent->d_sb, bindex)->br_mnt; | |
4869 | + path_get(&h_nd.path); | |
4870 | + valid = reval(h_dentry, &h_nd); | |
4871 | + path_put(&h_nd.path); | |
4872 | + if (locked) | |
4873 | + di_read_unlock(parent, AuLock_IR); | |
4874 | + } | |
4875 | + | |
4876 | + if (unlikely(valid < 0)) | |
4877 | + err = valid; | |
4878 | + else if (!valid) | |
4879 | + err = -EINVAL; | |
4880 | + | |
4f0767ce | 4881 | +out: |
1facf9fc | 4882 | + AuTraceErr(err); |
4883 | + return err; | |
4884 | +} | |
4885 | + | |
4886 | +/* todo: remove this */ | |
4887 | +static int h_d_revalidate(struct dentry *dentry, struct inode *inode, | |
4888 | + struct nameidata *nd, int do_udba) | |
4889 | +{ | |
4890 | + int err; | |
4891 | + umode_t mode, h_mode; | |
4892 | + aufs_bindex_t bindex, btail, bstart, ibs, ibe; | |
4893 | + unsigned char plus, unhashed, is_root, h_plus; | |
4a4d8108 | 4894 | + struct inode *h_inode, *h_cached_inode; |
1facf9fc | 4895 | + struct dentry *h_dentry; |
4896 | + struct qstr *name, *h_name; | |
4897 | + | |
4898 | + err = 0; | |
4899 | + plus = 0; | |
4900 | + mode = 0; | |
1facf9fc | 4901 | + ibs = -1; |
4902 | + ibe = -1; | |
4903 | + unhashed = !!d_unhashed(dentry); | |
4904 | + is_root = !!IS_ROOT(dentry); | |
4905 | + name = &dentry->d_name; | |
4906 | + | |
4907 | + /* | |
953406b4 AM |
4908 | + * Theoretically, REVAL test should be unnecessary in case of |
4909 | + * {FS,I}NOTIFY. | |
4910 | + * But {fs,i}notify doesn't fire some necessary events, | |
1facf9fc | 4911 | + * IN_ATTRIB for atime/nlink/pageio |
4912 | + * IN_DELETE for NFS dentry | |
4913 | + * Let's do REVAL test too. | |
4914 | + */ | |
4915 | + if (do_udba && inode) { | |
4916 | + mode = (inode->i_mode & S_IFMT); | |
4917 | + plus = (inode->i_nlink > 0); | |
1facf9fc | 4918 | + ibs = au_ibstart(inode); |
4919 | + ibe = au_ibend(inode); | |
4920 | + } | |
4921 | + | |
4922 | + bstart = au_dbstart(dentry); | |
4923 | + btail = bstart; | |
4924 | + if (inode && S_ISDIR(inode->i_mode)) | |
4925 | + btail = au_dbtaildir(dentry); | |
4926 | + for (bindex = bstart; bindex <= btail; bindex++) { | |
4927 | + h_dentry = au_h_dptr(dentry, bindex); | |
4928 | + if (!h_dentry) | |
4929 | + continue; | |
4930 | + | |
4931 | + AuDbg("b%d, %.*s\n", bindex, AuDLNPair(h_dentry)); | |
4932 | + h_name = &h_dentry->d_name; | |
4933 | + if (unlikely(do_udba | |
4934 | + && !is_root | |
4935 | + && (unhashed != !!d_unhashed(h_dentry) | |
4936 | + || name->len != h_name->len | |
4937 | + || memcmp(name->name, h_name->name, name->len)) | |
4938 | + )) { | |
4939 | + AuDbg("unhash 0x%x 0x%x, %.*s %.*s\n", | |
4940 | + unhashed, d_unhashed(h_dentry), | |
4941 | + AuDLNPair(dentry), AuDLNPair(h_dentry)); | |
4942 | + goto err; | |
4943 | + } | |
4944 | + | |
4945 | + err = au_do_h_d_reval(h_dentry, nd, dentry, bindex); | |
4946 | + if (unlikely(err)) | |
4947 | + /* do not goto err, to keep the errno */ | |
4948 | + break; | |
4949 | + | |
4950 | + /* todo: plink too? */ | |
4951 | + if (!do_udba) | |
4952 | + continue; | |
4953 | + | |
4954 | + /* UDBA tests */ | |
4955 | + h_inode = h_dentry->d_inode; | |
4956 | + if (unlikely(!!inode != !!h_inode)) | |
4957 | + goto err; | |
4958 | + | |
4959 | + h_plus = plus; | |
4960 | + h_mode = mode; | |
4961 | + h_cached_inode = h_inode; | |
4962 | + if (h_inode) { | |
4963 | + h_mode = (h_inode->i_mode & S_IFMT); | |
4964 | + h_plus = (h_inode->i_nlink > 0); | |
4965 | + } | |
4966 | + if (inode && ibs <= bindex && bindex <= ibe) | |
4967 | + h_cached_inode = au_h_iptr(inode, bindex); | |
4968 | + | |
4969 | + if (unlikely(plus != h_plus | |
4970 | + || mode != h_mode | |
4971 | + || h_cached_inode != h_inode)) | |
4972 | + goto err; | |
4973 | + continue; | |
4974 | + | |
4975 | + err: | |
4976 | + err = -EINVAL; | |
4977 | + break; | |
4978 | + } | |
4979 | + | |
4980 | + return err; | |
4981 | +} | |
4982 | + | |
4983 | +static int simple_reval_dpath(struct dentry *dentry, unsigned int sigen) | |
4984 | +{ | |
4985 | + int err; | |
4986 | + struct dentry *parent; | |
4987 | + struct inode *inode; | |
4988 | + | |
4989 | + inode = dentry->d_inode; | |
4990 | + if (au_digen(dentry) == sigen && au_iigen(inode) == sigen) | |
4991 | + return 0; | |
4992 | + | |
4993 | + parent = dget_parent(dentry); | |
4994 | + di_read_lock_parent(parent, AuLock_IR); | |
4995 | + AuDebugOn(au_digen(parent) != sigen | |
4996 | + || au_iigen(parent->d_inode) != sigen); | |
4997 | + au_dbg_verify_gen(parent, sigen); | |
4998 | + | |
4999 | + /* returns a number of positive dentries */ | |
5000 | + err = au_refresh_hdentry(dentry, inode->i_mode & S_IFMT); | |
5001 | + if (err >= 0) | |
5002 | + err = au_refresh_hinode(inode, dentry); | |
5003 | + | |
5004 | + di_read_unlock(parent, AuLock_IR); | |
5005 | + dput(parent); | |
5006 | + return err; | |
5007 | +} | |
5008 | + | |
5009 | +int au_reval_dpath(struct dentry *dentry, unsigned int sigen) | |
5010 | +{ | |
5011 | + int err; | |
5012 | + struct dentry *d, *parent; | |
5013 | + struct inode *inode; | |
5014 | + | |
5015 | + if (!au_ftest_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIRS)) | |
5016 | + return simple_reval_dpath(dentry, sigen); | |
5017 | + | |
5018 | + /* slow loop, keep it simple and stupid */ | |
5019 | + /* cf: au_cpup_dirs() */ | |
5020 | + err = 0; | |
5021 | + parent = NULL; | |
5022 | + while (au_digen(dentry) != sigen | |
5023 | + || au_iigen(dentry->d_inode) != sigen) { | |
5024 | + d = dentry; | |
5025 | + while (1) { | |
5026 | + dput(parent); | |
5027 | + parent = dget_parent(d); | |
5028 | + if (au_digen(parent) == sigen | |
5029 | + && au_iigen(parent->d_inode) == sigen) | |
5030 | + break; | |
5031 | + d = parent; | |
5032 | + } | |
5033 | + | |
5034 | + inode = d->d_inode; | |
5035 | + if (d != dentry) | |
5036 | + di_write_lock_child(d); | |
5037 | + | |
5038 | + /* someone might update our dentry while we were sleeping */ | |
5039 | + if (au_digen(d) != sigen || au_iigen(d->d_inode) != sigen) { | |
5040 | + di_read_lock_parent(parent, AuLock_IR); | |
5041 | + /* returns a number of positive dentries */ | |
5042 | + err = au_refresh_hdentry(d, inode->i_mode & S_IFMT); | |
5043 | + if (err >= 0) | |
5044 | + err = au_refresh_hinode(inode, d); | |
5045 | + di_read_unlock(parent, AuLock_IR); | |
5046 | + } | |
5047 | + | |
5048 | + if (d != dentry) | |
5049 | + di_write_unlock(d); | |
5050 | + dput(parent); | |
5051 | + if (unlikely(err)) | |
5052 | + break; | |
5053 | + } | |
5054 | + | |
5055 | + return err; | |
5056 | +} | |
5057 | + | |
5058 | +/* | |
5059 | + * if valid returns 1, otherwise 0. | |
5060 | + */ | |
5061 | +static int aufs_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
5062 | +{ | |
5063 | + int valid, err; | |
5064 | + unsigned int sigen; | |
5065 | + unsigned char do_udba; | |
5066 | + struct super_block *sb; | |
5067 | + struct inode *inode; | |
5068 | + | |
953406b4 | 5069 | + err = -EINVAL; |
1facf9fc | 5070 | + sb = dentry->d_sb; |
5071 | + inode = dentry->d_inode; | |
953406b4 | 5072 | + aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW); |
1facf9fc | 5073 | + sigen = au_sigen(sb); |
5074 | + if (au_digen(dentry) != sigen) { | |
5075 | + AuDebugOn(IS_ROOT(dentry)); | |
5076 | + if (inode) | |
5077 | + err = au_reval_dpath(dentry, sigen); | |
5078 | + if (unlikely(err)) | |
5079 | + goto out_dgrade; | |
1facf9fc | 5080 | + } |
5081 | + if (inode && au_iigen(inode) != sigen) { | |
5082 | + AuDebugOn(IS_ROOT(dentry)); | |
5083 | + err = au_refresh_hinode(inode, dentry); | |
5084 | + if (unlikely(err)) | |
5085 | + goto out_dgrade; | |
1facf9fc | 5086 | + } |
5087 | + di_downgrade_lock(dentry, AuLock_IR); | |
5088 | + | |
1facf9fc | 5089 | + err = -EINVAL; |
5090 | + do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE); | |
5091 | + if (do_udba && inode) { | |
5092 | + aufs_bindex_t bstart = au_ibstart(inode); | |
5093 | + | |
5094 | + if (bstart >= 0 | |
5095 | + && au_test_higen(inode, au_h_iptr(inode, bstart))) | |
953406b4 | 5096 | + goto out; |
1facf9fc | 5097 | + } |
5098 | + | |
5099 | + err = h_d_revalidate(dentry, inode, nd, do_udba); | |
5100 | + if (unlikely(!err && do_udba && au_dbstart(dentry) < 0)) | |
5101 | + /* both of real entry and whiteout found */ | |
5102 | + err = -EIO; | |
953406b4 | 5103 | + goto out; |
1facf9fc | 5104 | + |
4f0767ce | 5105 | +out_dgrade: |
1facf9fc | 5106 | + di_downgrade_lock(dentry, AuLock_IR); |
953406b4 | 5107 | +out: |
1facf9fc | 5108 | + aufs_read_unlock(dentry, AuLock_IR); |
5109 | + AuTraceErr(err); | |
5110 | + valid = !err; | |
5111 | + if (!valid) | |
953406b4 | 5112 | + AuDbg("%.*s invalid\n", AuDLNPair(dentry)); |
1facf9fc | 5113 | + return valid; |
5114 | +} | |
5115 | + | |
5116 | +static void aufs_d_release(struct dentry *dentry) | |
5117 | +{ | |
4a4d8108 AM |
5118 | + if (dentry->d_fsdata) { |
5119 | + au_di_fin(dentry); | |
5120 | + au_hn_di_reinit(dentry); | |
1facf9fc | 5121 | + } |
1facf9fc | 5122 | +} |
5123 | + | |
4a4d8108 | 5124 | +const struct dentry_operations aufs_dop = { |
1facf9fc | 5125 | + .d_revalidate = aufs_d_revalidate, |
5126 | + .d_release = aufs_d_release | |
5127 | +}; | |
b752ccd1 AM |
5128 | diff -urN /usr/share/empty/fs/aufs/dentry.h linux/fs/aufs/dentry.h |
5129 | --- /usr/share/empty/fs/aufs/dentry.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 5130 | +++ linux/fs/aufs/dentry.h 2010-10-21 09:52:43.086957936 +0200 |
1308ab2a | 5131 | @@ -0,0 +1,231 @@ |
1facf9fc | 5132 | +/* |
4a4d8108 | 5133 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 5134 | + * |
5135 | + * This program, aufs is free software; you can redistribute it and/or modify | |
5136 | + * it under the terms of the GNU General Public License as published by | |
5137 | + * the Free Software Foundation; either version 2 of the License, or | |
5138 | + * (at your option) any later version. | |
dece6358 AM |
5139 | + * |
5140 | + * This program is distributed in the hope that it will be useful, | |
5141 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
5142 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
5143 | + * GNU General Public License for more details. | |
5144 | + * | |
5145 | + * You should have received a copy of the GNU General Public License | |
5146 | + * along with this program; if not, write to the Free Software | |
5147 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 5148 | + */ |
5149 | + | |
5150 | +/* | |
5151 | + * lookup and dentry operations | |
5152 | + */ | |
5153 | + | |
5154 | +#ifndef __AUFS_DENTRY_H__ | |
5155 | +#define __AUFS_DENTRY_H__ | |
5156 | + | |
5157 | +#ifdef __KERNEL__ | |
5158 | + | |
dece6358 | 5159 | +#include <linux/dcache.h> |
1facf9fc | 5160 | +#include <linux/aufs_type.h> |
5161 | +#include "rwsem.h" | |
5162 | + | |
5163 | +/* make a single member structure for future use */ | |
5164 | +/* todo: remove this structure */ | |
5165 | +struct au_hdentry { | |
5166 | + struct dentry *hd_dentry; | |
5167 | +}; | |
5168 | + | |
5169 | +struct au_dinfo { | |
5170 | + atomic_t di_generation; | |
5171 | + | |
dece6358 | 5172 | + struct au_rwsem di_rwsem; |
1facf9fc | 5173 | + aufs_bindex_t di_bstart, di_bend, di_bwh, di_bdiropq; |
5174 | + struct au_hdentry *di_hdentry; | |
4a4d8108 | 5175 | +} ____cacheline_aligned_in_smp; |
1facf9fc | 5176 | + |
5177 | +/* ---------------------------------------------------------------------- */ | |
5178 | + | |
5179 | +/* dentry.c */ | |
4a4d8108 | 5180 | +extern const struct dentry_operations aufs_dop; |
1facf9fc | 5181 | +struct au_branch; |
5182 | +struct dentry *au_lkup_one(struct qstr *name, struct dentry *h_parent, | |
5183 | + struct au_branch *br, struct nameidata *nd); | |
5184 | +struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent, | |
5185 | + struct au_branch *br); | |
5186 | +int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir, | |
5187 | + struct dentry *h_parent, struct au_branch *br); | |
5188 | + | |
5189 | +int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type, | |
5190 | + struct nameidata *nd); | |
5191 | +int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex); | |
5192 | +int au_refresh_hdentry(struct dentry *dentry, mode_t type); | |
5193 | +int au_reval_dpath(struct dentry *dentry, unsigned int sigen); | |
5194 | + | |
5195 | +/* dinfo.c */ | |
4a4d8108 AM |
5196 | +void au_di_init_once(void *_di); |
5197 | +int au_di_init(struct dentry *dentry); | |
5198 | +void au_di_fin(struct dentry *dentry); | |
1facf9fc | 5199 | +int au_di_realloc(struct au_dinfo *dinfo, int nbr); |
5200 | + | |
5201 | +void di_read_lock(struct dentry *d, int flags, unsigned int lsc); | |
5202 | +void di_read_unlock(struct dentry *d, int flags); | |
5203 | +void di_downgrade_lock(struct dentry *d, int flags); | |
5204 | +void di_write_lock(struct dentry *d, unsigned int lsc); | |
5205 | +void di_write_unlock(struct dentry *d); | |
5206 | +void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir); | |
5207 | +void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir); | |
5208 | +void di_write_unlock2(struct dentry *d1, struct dentry *d2); | |
5209 | + | |
5210 | +struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex); | |
5211 | +aufs_bindex_t au_dbtail(struct dentry *dentry); | |
5212 | +aufs_bindex_t au_dbtaildir(struct dentry *dentry); | |
5213 | + | |
5214 | +void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex, | |
5215 | + struct dentry *h_dentry); | |
5216 | +void au_update_digen(struct dentry *dentry); | |
5217 | +void au_update_dbrange(struct dentry *dentry, int do_put_zero); | |
5218 | +void au_update_dbstart(struct dentry *dentry); | |
5219 | +void au_update_dbend(struct dentry *dentry); | |
5220 | +int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry); | |
5221 | + | |
5222 | +/* ---------------------------------------------------------------------- */ | |
5223 | + | |
5224 | +static inline struct au_dinfo *au_di(struct dentry *dentry) | |
5225 | +{ | |
5226 | + return dentry->d_fsdata; | |
5227 | +} | |
5228 | + | |
5229 | +/* ---------------------------------------------------------------------- */ | |
5230 | + | |
5231 | +/* lock subclass for dinfo */ | |
5232 | +enum { | |
5233 | + AuLsc_DI_CHILD, /* child first */ | |
4a4d8108 | 5234 | + AuLsc_DI_CHILD2, /* rename(2), link(2), and cpup at hnotify */ |
1facf9fc | 5235 | + AuLsc_DI_CHILD3, /* copyup dirs */ |
5236 | + AuLsc_DI_PARENT, | |
5237 | + AuLsc_DI_PARENT2, | |
5238 | + AuLsc_DI_PARENT3 | |
5239 | +}; | |
5240 | + | |
5241 | +/* | |
5242 | + * di_read_lock_child, di_write_lock_child, | |
5243 | + * di_read_lock_child2, di_write_lock_child2, | |
5244 | + * di_read_lock_child3, di_write_lock_child3, | |
5245 | + * di_read_lock_parent, di_write_lock_parent, | |
5246 | + * di_read_lock_parent2, di_write_lock_parent2, | |
5247 | + * di_read_lock_parent3, di_write_lock_parent3, | |
5248 | + */ | |
5249 | +#define AuReadLockFunc(name, lsc) \ | |
5250 | +static inline void di_read_lock_##name(struct dentry *d, int flags) \ | |
5251 | +{ di_read_lock(d, flags, AuLsc_DI_##lsc); } | |
5252 | + | |
5253 | +#define AuWriteLockFunc(name, lsc) \ | |
5254 | +static inline void di_write_lock_##name(struct dentry *d) \ | |
5255 | +{ di_write_lock(d, AuLsc_DI_##lsc); } | |
5256 | + | |
5257 | +#define AuRWLockFuncs(name, lsc) \ | |
5258 | + AuReadLockFunc(name, lsc) \ | |
5259 | + AuWriteLockFunc(name, lsc) | |
5260 | + | |
5261 | +AuRWLockFuncs(child, CHILD); | |
5262 | +AuRWLockFuncs(child2, CHILD2); | |
5263 | +AuRWLockFuncs(child3, CHILD3); | |
5264 | +AuRWLockFuncs(parent, PARENT); | |
5265 | +AuRWLockFuncs(parent2, PARENT2); | |
5266 | +AuRWLockFuncs(parent3, PARENT3); | |
5267 | + | |
5268 | +#undef AuReadLockFunc | |
5269 | +#undef AuWriteLockFunc | |
5270 | +#undef AuRWLockFuncs | |
5271 | + | |
5272 | +#define DiMustNoWaiters(d) AuRwMustNoWaiters(&au_di(d)->di_rwsem) | |
dece6358 AM |
5273 | +#define DiMustAnyLock(d) AuRwMustAnyLock(&au_di(d)->di_rwsem) |
5274 | +#define DiMustWriteLock(d) AuRwMustWriteLock(&au_di(d)->di_rwsem) | |
1facf9fc | 5275 | + |
5276 | +/* ---------------------------------------------------------------------- */ | |
5277 | + | |
5278 | +/* todo: memory barrier? */ | |
5279 | +static inline unsigned int au_digen(struct dentry *d) | |
5280 | +{ | |
5281 | + return atomic_read(&au_di(d)->di_generation); | |
5282 | +} | |
5283 | + | |
5284 | +static inline void au_h_dentry_init(struct au_hdentry *hdentry) | |
5285 | +{ | |
5286 | + hdentry->hd_dentry = NULL; | |
5287 | +} | |
5288 | + | |
5289 | +static inline void au_hdput(struct au_hdentry *hd) | |
5290 | +{ | |
4a4d8108 AM |
5291 | + if (hd) |
5292 | + dput(hd->hd_dentry); | |
1facf9fc | 5293 | +} |
5294 | + | |
5295 | +static inline aufs_bindex_t au_dbstart(struct dentry *dentry) | |
5296 | +{ | |
1308ab2a | 5297 | + DiMustAnyLock(dentry); |
1facf9fc | 5298 | + return au_di(dentry)->di_bstart; |
5299 | +} | |
5300 | + | |
5301 | +static inline aufs_bindex_t au_dbend(struct dentry *dentry) | |
5302 | +{ | |
1308ab2a | 5303 | + DiMustAnyLock(dentry); |
1facf9fc | 5304 | + return au_di(dentry)->di_bend; |
5305 | +} | |
5306 | + | |
5307 | +static inline aufs_bindex_t au_dbwh(struct dentry *dentry) | |
5308 | +{ | |
1308ab2a | 5309 | + DiMustAnyLock(dentry); |
1facf9fc | 5310 | + return au_di(dentry)->di_bwh; |
5311 | +} | |
5312 | + | |
5313 | +static inline aufs_bindex_t au_dbdiropq(struct dentry *dentry) | |
5314 | +{ | |
1308ab2a | 5315 | + DiMustAnyLock(dentry); |
1facf9fc | 5316 | + return au_di(dentry)->di_bdiropq; |
5317 | +} | |
5318 | + | |
5319 | +/* todo: hard/soft set? */ | |
5320 | +static inline void au_set_dbstart(struct dentry *dentry, aufs_bindex_t bindex) | |
5321 | +{ | |
1308ab2a | 5322 | + DiMustWriteLock(dentry); |
1facf9fc | 5323 | + au_di(dentry)->di_bstart = bindex; |
5324 | +} | |
5325 | + | |
5326 | +static inline void au_set_dbend(struct dentry *dentry, aufs_bindex_t bindex) | |
5327 | +{ | |
1308ab2a | 5328 | + DiMustWriteLock(dentry); |
1facf9fc | 5329 | + au_di(dentry)->di_bend = bindex; |
5330 | +} | |
5331 | + | |
5332 | +static inline void au_set_dbwh(struct dentry *dentry, aufs_bindex_t bindex) | |
5333 | +{ | |
1308ab2a | 5334 | + DiMustWriteLock(dentry); |
1facf9fc | 5335 | + /* dbwh can be outside of bstart - bend range */ |
5336 | + au_di(dentry)->di_bwh = bindex; | |
5337 | +} | |
5338 | + | |
5339 | +static inline void au_set_dbdiropq(struct dentry *dentry, aufs_bindex_t bindex) | |
5340 | +{ | |
1308ab2a | 5341 | + DiMustWriteLock(dentry); |
1facf9fc | 5342 | + au_di(dentry)->di_bdiropq = bindex; |
5343 | +} | |
5344 | + | |
5345 | +/* ---------------------------------------------------------------------- */ | |
5346 | + | |
4a4d8108 | 5347 | +#ifdef CONFIG_AUFS_HNOTIFY |
1facf9fc | 5348 | +static inline void au_digen_dec(struct dentry *d) |
5349 | +{ | |
953406b4 | 5350 | + atomic_dec_return(&au_di(d)->di_generation); |
1facf9fc | 5351 | +} |
5352 | + | |
4a4d8108 | 5353 | +static inline void au_hn_di_reinit(struct dentry *dentry) |
1facf9fc | 5354 | +{ |
5355 | + dentry->d_fsdata = NULL; | |
5356 | +} | |
5357 | +#else | |
4a4d8108 AM |
5358 | +AuStubVoid(au_hn_di_reinit, struct dentry *dentry __maybe_unused) |
5359 | +#endif /* CONFIG_AUFS_HNOTIFY */ | |
1facf9fc | 5360 | + |
5361 | +#endif /* __KERNEL__ */ | |
5362 | +#endif /* __AUFS_DENTRY_H__ */ | |
b752ccd1 AM |
5363 | diff -urN /usr/share/empty/fs/aufs/dinfo.c linux/fs/aufs/dinfo.c |
5364 | --- /usr/share/empty/fs/aufs/dinfo.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
5365 | +++ linux/fs/aufs/dinfo.c 2010-10-21 09:52:43.086957936 +0200 |
5366 | @@ -0,0 +1,395 @@ | |
1facf9fc | 5367 | +/* |
4a4d8108 | 5368 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 5369 | + * |
5370 | + * This program, aufs is free software; you can redistribute it and/or modify | |
5371 | + * it under the terms of the GNU General Public License as published by | |
5372 | + * the Free Software Foundation; either version 2 of the License, or | |
5373 | + * (at your option) any later version. | |
dece6358 AM |
5374 | + * |
5375 | + * This program is distributed in the hope that it will be useful, | |
5376 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
5377 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
5378 | + * GNU General Public License for more details. | |
5379 | + * | |
5380 | + * You should have received a copy of the GNU General Public License | |
5381 | + * along with this program; if not, write to the Free Software | |
5382 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 5383 | + */ |
5384 | + | |
5385 | +/* | |
5386 | + * dentry private data | |
5387 | + */ | |
5388 | + | |
5389 | +#include "aufs.h" | |
5390 | + | |
953406b4 | 5391 | +void au_di_init_once(void *_di) |
4a4d8108 | 5392 | +{ |
953406b4 | 5393 | + struct au_dinfo *di = _di; |
4a4d8108 | 5394 | + |
953406b4 | 5395 | + au_rw_init(&di->di_rwsem); |
4a4d8108 AM |
5396 | +} |
5397 | + | |
5398 | +int au_di_init(struct dentry *dentry) | |
1facf9fc | 5399 | +{ |
5400 | + struct au_dinfo *dinfo; | |
5401 | + struct super_block *sb; | |
5402 | + int nbr; | |
5403 | + | |
5404 | + dinfo = au_cache_alloc_dinfo(); | |
5405 | + if (unlikely(!dinfo)) | |
5406 | + goto out; | |
5407 | + | |
5408 | + sb = dentry->d_sb; | |
5409 | + nbr = au_sbend(sb) + 1; | |
5410 | + if (nbr <= 0) | |
5411 | + nbr = 1; | |
5412 | + dinfo->di_hdentry = kcalloc(nbr, sizeof(*dinfo->di_hdentry), GFP_NOFS); | |
5413 | + if (unlikely(!dinfo->di_hdentry)) | |
5414 | + goto out_dinfo; | |
5415 | + | |
5416 | + atomic_set(&dinfo->di_generation, au_sigen(sb)); | |
5417 | + /* smp_mb(); */ /* atomic_set */ | |
4a4d8108 | 5418 | + au_rw_write_lock_nested(&dinfo->di_rwsem, AuLsc_DI_CHILD); |
1facf9fc | 5419 | + dinfo->di_bstart = -1; |
5420 | + dinfo->di_bend = -1; | |
5421 | + dinfo->di_bwh = -1; | |
5422 | + dinfo->di_bdiropq = -1; | |
5423 | + | |
5424 | + dentry->d_fsdata = dinfo; | |
5425 | + dentry->d_op = &aufs_dop; | |
5426 | + return 0; /* success */ | |
5427 | + | |
4f0767ce | 5428 | +out_dinfo: |
1facf9fc | 5429 | + au_cache_free_dinfo(dinfo); |
4f0767ce | 5430 | +out: |
1facf9fc | 5431 | + return -ENOMEM; |
5432 | +} | |
5433 | + | |
4a4d8108 AM |
5434 | +void au_di_fin(struct dentry *dentry) |
5435 | +{ | |
5436 | + struct au_dinfo *di; | |
5437 | + struct au_hdentry *p; | |
5438 | + aufs_bindex_t bend, bindex; | |
5439 | + | |
5440 | + /* dentry may not be revalidated */ | |
5441 | + di = dentry->d_fsdata; | |
5442 | + bindex = di->di_bstart; | |
5443 | + if (bindex >= 0) { | |
5444 | + bend = di->di_bend; | |
5445 | + p = di->di_hdentry + bindex; | |
5446 | + while (bindex++ <= bend) | |
5447 | + au_hdput(p++); | |
5448 | + } | |
5449 | + kfree(di->di_hdentry); | |
5450 | + AuRwDestroy(&di->di_rwsem); | |
5451 | + au_cache_free_dinfo(di); | |
5452 | +} | |
5453 | + | |
1facf9fc | 5454 | +int au_di_realloc(struct au_dinfo *dinfo, int nbr) |
5455 | +{ | |
5456 | + int err, sz; | |
5457 | + struct au_hdentry *hdp; | |
5458 | + | |
1308ab2a | 5459 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
5460 | + | |
1facf9fc | 5461 | + err = -ENOMEM; |
5462 | + sz = sizeof(*hdp) * (dinfo->di_bend + 1); | |
5463 | + if (!sz) | |
5464 | + sz = sizeof(*hdp); | |
5465 | + hdp = au_kzrealloc(dinfo->di_hdentry, sz, sizeof(*hdp) * nbr, GFP_NOFS); | |
5466 | + if (hdp) { | |
5467 | + dinfo->di_hdentry = hdp; | |
5468 | + err = 0; | |
5469 | + } | |
5470 | + | |
5471 | + return err; | |
5472 | +} | |
5473 | + | |
5474 | +/* ---------------------------------------------------------------------- */ | |
5475 | + | |
5476 | +static void do_ii_write_lock(struct inode *inode, unsigned int lsc) | |
5477 | +{ | |
5478 | + switch (lsc) { | |
5479 | + case AuLsc_DI_CHILD: | |
5480 | + ii_write_lock_child(inode); | |
5481 | + break; | |
5482 | + case AuLsc_DI_CHILD2: | |
5483 | + ii_write_lock_child2(inode); | |
5484 | + break; | |
5485 | + case AuLsc_DI_CHILD3: | |
5486 | + ii_write_lock_child3(inode); | |
5487 | + break; | |
5488 | + case AuLsc_DI_PARENT: | |
5489 | + ii_write_lock_parent(inode); | |
5490 | + break; | |
5491 | + case AuLsc_DI_PARENT2: | |
5492 | + ii_write_lock_parent2(inode); | |
5493 | + break; | |
5494 | + case AuLsc_DI_PARENT3: | |
5495 | + ii_write_lock_parent3(inode); | |
5496 | + break; | |
5497 | + default: | |
5498 | + BUG(); | |
5499 | + } | |
5500 | +} | |
5501 | + | |
5502 | +static void do_ii_read_lock(struct inode *inode, unsigned int lsc) | |
5503 | +{ | |
5504 | + switch (lsc) { | |
5505 | + case AuLsc_DI_CHILD: | |
5506 | + ii_read_lock_child(inode); | |
5507 | + break; | |
5508 | + case AuLsc_DI_CHILD2: | |
5509 | + ii_read_lock_child2(inode); | |
5510 | + break; | |
5511 | + case AuLsc_DI_CHILD3: | |
5512 | + ii_read_lock_child3(inode); | |
5513 | + break; | |
5514 | + case AuLsc_DI_PARENT: | |
5515 | + ii_read_lock_parent(inode); | |
5516 | + break; | |
5517 | + case AuLsc_DI_PARENT2: | |
5518 | + ii_read_lock_parent2(inode); | |
5519 | + break; | |
5520 | + case AuLsc_DI_PARENT3: | |
5521 | + ii_read_lock_parent3(inode); | |
5522 | + break; | |
5523 | + default: | |
5524 | + BUG(); | |
5525 | + } | |
5526 | +} | |
5527 | + | |
5528 | +void di_read_lock(struct dentry *d, int flags, unsigned int lsc) | |
5529 | +{ | |
dece6358 | 5530 | + au_rw_read_lock_nested(&au_di(d)->di_rwsem, lsc); |
1facf9fc | 5531 | + if (d->d_inode) { |
5532 | + if (au_ftest_lock(flags, IW)) | |
5533 | + do_ii_write_lock(d->d_inode, lsc); | |
5534 | + else if (au_ftest_lock(flags, IR)) | |
5535 | + do_ii_read_lock(d->d_inode, lsc); | |
5536 | + } | |
5537 | +} | |
5538 | + | |
5539 | +void di_read_unlock(struct dentry *d, int flags) | |
5540 | +{ | |
5541 | + if (d->d_inode) { | |
5542 | + if (au_ftest_lock(flags, IW)) | |
5543 | + ii_write_unlock(d->d_inode); | |
5544 | + else if (au_ftest_lock(flags, IR)) | |
5545 | + ii_read_unlock(d->d_inode); | |
5546 | + } | |
dece6358 | 5547 | + au_rw_read_unlock(&au_di(d)->di_rwsem); |
1facf9fc | 5548 | +} |
5549 | + | |
5550 | +void di_downgrade_lock(struct dentry *d, int flags) | |
5551 | +{ | |
1facf9fc | 5552 | + if (d->d_inode && au_ftest_lock(flags, IR)) |
5553 | + ii_downgrade_lock(d->d_inode); | |
dece6358 | 5554 | + au_rw_dgrade_lock(&au_di(d)->di_rwsem); |
1facf9fc | 5555 | +} |
5556 | + | |
5557 | +void di_write_lock(struct dentry *d, unsigned int lsc) | |
5558 | +{ | |
dece6358 | 5559 | + au_rw_write_lock_nested(&au_di(d)->di_rwsem, lsc); |
1facf9fc | 5560 | + if (d->d_inode) |
5561 | + do_ii_write_lock(d->d_inode, lsc); | |
5562 | +} | |
5563 | + | |
5564 | +void di_write_unlock(struct dentry *d) | |
5565 | +{ | |
5566 | + if (d->d_inode) | |
5567 | + ii_write_unlock(d->d_inode); | |
dece6358 | 5568 | + au_rw_write_unlock(&au_di(d)->di_rwsem); |
1facf9fc | 5569 | +} |
5570 | + | |
5571 | +void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir) | |
5572 | +{ | |
5573 | + AuDebugOn(d1 == d2 | |
5574 | + || d1->d_inode == d2->d_inode | |
5575 | + || d1->d_sb != d2->d_sb); | |
5576 | + | |
5577 | + if (isdir && au_test_subdir(d1, d2)) { | |
5578 | + di_write_lock_child(d1); | |
5579 | + di_write_lock_child2(d2); | |
5580 | + } else { | |
5581 | + /* there should be no races */ | |
5582 | + di_write_lock_child(d2); | |
5583 | + di_write_lock_child2(d1); | |
5584 | + } | |
5585 | +} | |
5586 | + | |
5587 | +void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir) | |
5588 | +{ | |
5589 | + AuDebugOn(d1 == d2 | |
5590 | + || d1->d_inode == d2->d_inode | |
5591 | + || d1->d_sb != d2->d_sb); | |
5592 | + | |
5593 | + if (isdir && au_test_subdir(d1, d2)) { | |
5594 | + di_write_lock_parent(d1); | |
5595 | + di_write_lock_parent2(d2); | |
5596 | + } else { | |
5597 | + /* there should be no races */ | |
5598 | + di_write_lock_parent(d2); | |
5599 | + di_write_lock_parent2(d1); | |
5600 | + } | |
5601 | +} | |
5602 | + | |
5603 | +void di_write_unlock2(struct dentry *d1, struct dentry *d2) | |
5604 | +{ | |
5605 | + di_write_unlock(d1); | |
5606 | + if (d1->d_inode == d2->d_inode) | |
dece6358 | 5607 | + au_rw_write_unlock(&au_di(d2)->di_rwsem); |
1facf9fc | 5608 | + else |
5609 | + di_write_unlock(d2); | |
5610 | +} | |
5611 | + | |
5612 | +/* ---------------------------------------------------------------------- */ | |
5613 | + | |
5614 | +struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex) | |
5615 | +{ | |
5616 | + struct dentry *d; | |
5617 | + | |
1308ab2a | 5618 | + DiMustAnyLock(dentry); |
5619 | + | |
1facf9fc | 5620 | + if (au_dbstart(dentry) < 0 || bindex < au_dbstart(dentry)) |
5621 | + return NULL; | |
5622 | + AuDebugOn(bindex < 0); | |
5623 | + d = au_di(dentry)->di_hdentry[0 + bindex].hd_dentry; | |
5624 | + AuDebugOn(d && (atomic_read(&d->d_count) <= 0)); | |
5625 | + return d; | |
5626 | +} | |
5627 | + | |
5628 | +aufs_bindex_t au_dbtail(struct dentry *dentry) | |
5629 | +{ | |
5630 | + aufs_bindex_t bend, bwh; | |
5631 | + | |
5632 | + bend = au_dbend(dentry); | |
5633 | + if (0 <= bend) { | |
5634 | + bwh = au_dbwh(dentry); | |
5635 | + if (!bwh) | |
5636 | + return bwh; | |
5637 | + if (0 < bwh && bwh < bend) | |
5638 | + return bwh - 1; | |
5639 | + } | |
5640 | + return bend; | |
5641 | +} | |
5642 | + | |
5643 | +aufs_bindex_t au_dbtaildir(struct dentry *dentry) | |
5644 | +{ | |
5645 | + aufs_bindex_t bend, bopq; | |
5646 | + | |
5647 | + bend = au_dbtail(dentry); | |
5648 | + if (0 <= bend) { | |
5649 | + bopq = au_dbdiropq(dentry); | |
5650 | + if (0 <= bopq && bopq < bend) | |
5651 | + bend = bopq; | |
5652 | + } | |
5653 | + return bend; | |
5654 | +} | |
5655 | + | |
5656 | +/* ---------------------------------------------------------------------- */ | |
5657 | + | |
5658 | +void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex, | |
5659 | + struct dentry *h_dentry) | |
5660 | +{ | |
5661 | + struct au_hdentry *hd = au_di(dentry)->di_hdentry + bindex; | |
5662 | + | |
1308ab2a | 5663 | + DiMustWriteLock(dentry); |
5664 | + | |
4a4d8108 | 5665 | + au_hdput(hd); |
1facf9fc | 5666 | + hd->hd_dentry = h_dentry; |
5667 | +} | |
5668 | + | |
5669 | +void au_update_digen(struct dentry *dentry) | |
5670 | +{ | |
5671 | + atomic_set(&au_di(dentry)->di_generation, au_sigen(dentry->d_sb)); | |
5672 | + /* smp_mb(); */ /* atomic_set */ | |
5673 | +} | |
5674 | + | |
5675 | +void au_update_dbrange(struct dentry *dentry, int do_put_zero) | |
5676 | +{ | |
5677 | + struct au_dinfo *dinfo; | |
5678 | + struct dentry *h_d; | |
4a4d8108 | 5679 | + struct au_hdentry *hdp; |
1facf9fc | 5680 | + |
1308ab2a | 5681 | + DiMustWriteLock(dentry); |
5682 | + | |
1facf9fc | 5683 | + dinfo = au_di(dentry); |
5684 | + if (!dinfo || dinfo->di_bstart < 0) | |
5685 | + return; | |
5686 | + | |
4a4d8108 | 5687 | + hdp = dinfo->di_hdentry; |
1facf9fc | 5688 | + if (do_put_zero) { |
5689 | + aufs_bindex_t bindex, bend; | |
5690 | + | |
5691 | + bend = dinfo->di_bend; | |
5692 | + for (bindex = dinfo->di_bstart; bindex <= bend; bindex++) { | |
4a4d8108 | 5693 | + h_d = hdp[0 + bindex].hd_dentry; |
1facf9fc | 5694 | + if (h_d && !h_d->d_inode) |
5695 | + au_set_h_dptr(dentry, bindex, NULL); | |
5696 | + } | |
5697 | + } | |
5698 | + | |
5699 | + dinfo->di_bstart = -1; | |
5700 | + while (++dinfo->di_bstart <= dinfo->di_bend) | |
4a4d8108 | 5701 | + if (hdp[0 + dinfo->di_bstart].hd_dentry) |
1facf9fc | 5702 | + break; |
5703 | + if (dinfo->di_bstart > dinfo->di_bend) { | |
5704 | + dinfo->di_bstart = -1; | |
5705 | + dinfo->di_bend = -1; | |
5706 | + return; | |
5707 | + } | |
5708 | + | |
5709 | + dinfo->di_bend++; | |
5710 | + while (0 <= --dinfo->di_bend) | |
4a4d8108 | 5711 | + if (hdp[0 + dinfo->di_bend].hd_dentry) |
1facf9fc | 5712 | + break; |
5713 | + AuDebugOn(dinfo->di_bstart > dinfo->di_bend || dinfo->di_bend < 0); | |
5714 | +} | |
5715 | + | |
5716 | +void au_update_dbstart(struct dentry *dentry) | |
5717 | +{ | |
5718 | + aufs_bindex_t bindex, bend; | |
5719 | + struct dentry *h_dentry; | |
5720 | + | |
5721 | + bend = au_dbend(dentry); | |
5722 | + for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) { | |
5723 | + h_dentry = au_h_dptr(dentry, bindex); | |
5724 | + if (!h_dentry) | |
5725 | + continue; | |
5726 | + if (h_dentry->d_inode) { | |
5727 | + au_set_dbstart(dentry, bindex); | |
5728 | + return; | |
5729 | + } | |
5730 | + au_set_h_dptr(dentry, bindex, NULL); | |
5731 | + } | |
5732 | +} | |
5733 | + | |
5734 | +void au_update_dbend(struct dentry *dentry) | |
5735 | +{ | |
5736 | + aufs_bindex_t bindex, bstart; | |
5737 | + struct dentry *h_dentry; | |
5738 | + | |
5739 | + bstart = au_dbstart(dentry); | |
5740 | + for (bindex = au_dbend(dentry); bindex <= bstart; bindex--) { | |
5741 | + h_dentry = au_h_dptr(dentry, bindex); | |
5742 | + if (!h_dentry) | |
5743 | + continue; | |
5744 | + if (h_dentry->d_inode) { | |
5745 | + au_set_dbend(dentry, bindex); | |
5746 | + return; | |
5747 | + } | |
5748 | + au_set_h_dptr(dentry, bindex, NULL); | |
5749 | + } | |
5750 | +} | |
5751 | + | |
5752 | +int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry) | |
5753 | +{ | |
5754 | + aufs_bindex_t bindex, bend; | |
5755 | + | |
5756 | + bend = au_dbend(dentry); | |
5757 | + for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) | |
5758 | + if (au_h_dptr(dentry, bindex) == h_dentry) | |
5759 | + return bindex; | |
5760 | + return -1; | |
5761 | +} | |
b752ccd1 AM |
5762 | diff -urN /usr/share/empty/fs/aufs/dir.c linux/fs/aufs/dir.c |
5763 | --- /usr/share/empty/fs/aufs/dir.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
5764 | +++ linux/fs/aufs/dir.c 2010-10-21 09:52:43.086957936 +0200 |
5765 | @@ -0,0 +1,638 @@ | |
1facf9fc | 5766 | +/* |
4a4d8108 | 5767 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 5768 | + * |
5769 | + * This program, aufs is free software; you can redistribute it and/or modify | |
5770 | + * it under the terms of the GNU General Public License as published by | |
5771 | + * the Free Software Foundation; either version 2 of the License, or | |
5772 | + * (at your option) any later version. | |
dece6358 AM |
5773 | + * |
5774 | + * This program is distributed in the hope that it will be useful, | |
5775 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
5776 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
5777 | + * GNU General Public License for more details. | |
5778 | + * | |
5779 | + * You should have received a copy of the GNU General Public License | |
5780 | + * along with this program; if not, write to the Free Software | |
5781 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 5782 | + */ |
5783 | + | |
5784 | +/* | |
5785 | + * directory operations | |
5786 | + */ | |
5787 | + | |
dece6358 | 5788 | +#include <linux/file.h> |
1facf9fc | 5789 | +#include <linux/fs_stack.h> |
5790 | +#include "aufs.h" | |
5791 | + | |
5792 | +void au_add_nlink(struct inode *dir, struct inode *h_dir) | |
5793 | +{ | |
5794 | + AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode)); | |
5795 | + | |
5796 | + dir->i_nlink += h_dir->i_nlink - 2; | |
5797 | + if (h_dir->i_nlink < 2) | |
5798 | + dir->i_nlink += 2; | |
5799 | +} | |
5800 | + | |
5801 | +void au_sub_nlink(struct inode *dir, struct inode *h_dir) | |
5802 | +{ | |
5803 | + AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode)); | |
5804 | + | |
5805 | + dir->i_nlink -= h_dir->i_nlink - 2; | |
5806 | + if (h_dir->i_nlink < 2) | |
5807 | + dir->i_nlink -= 2; | |
5808 | +} | |
5809 | + | |
1308ab2a | 5810 | +loff_t au_dir_size(struct file *file, struct dentry *dentry) |
5811 | +{ | |
5812 | + loff_t sz; | |
5813 | + aufs_bindex_t bindex, bend; | |
5814 | + struct file *h_file; | |
5815 | + struct dentry *h_dentry; | |
5816 | + | |
5817 | + sz = 0; | |
5818 | + if (file) { | |
5819 | + AuDebugOn(!file->f_dentry); | |
5820 | + AuDebugOn(!file->f_dentry->d_inode); | |
5821 | + AuDebugOn(!S_ISDIR(file->f_dentry->d_inode->i_mode)); | |
5822 | + | |
4a4d8108 | 5823 | + bend = au_fbend_dir(file); |
1308ab2a | 5824 | + for (bindex = au_fbstart(file); |
5825 | + bindex <= bend && sz < KMALLOC_MAX_SIZE; | |
5826 | + bindex++) { | |
4a4d8108 | 5827 | + h_file = au_hf_dir(file, bindex); |
1308ab2a | 5828 | + if (h_file |
5829 | + && h_file->f_dentry | |
5830 | + && h_file->f_dentry->d_inode) | |
5831 | + sz += i_size_read(h_file->f_dentry->d_inode); | |
5832 | + } | |
5833 | + } else { | |
5834 | + AuDebugOn(!dentry); | |
5835 | + AuDebugOn(!dentry->d_inode); | |
5836 | + AuDebugOn(!S_ISDIR(dentry->d_inode->i_mode)); | |
5837 | + | |
5838 | + bend = au_dbtaildir(dentry); | |
5839 | + for (bindex = au_dbstart(dentry); | |
5840 | + bindex <= bend && sz < KMALLOC_MAX_SIZE; | |
5841 | + bindex++) { | |
5842 | + h_dentry = au_h_dptr(dentry, bindex); | |
5843 | + if (h_dentry && h_dentry->d_inode) | |
5844 | + sz += i_size_read(h_dentry->d_inode); | |
5845 | + } | |
5846 | + } | |
5847 | + if (sz < KMALLOC_MAX_SIZE) | |
5848 | + sz = roundup_pow_of_two(sz); | |
5849 | + if (sz > KMALLOC_MAX_SIZE) | |
5850 | + sz = KMALLOC_MAX_SIZE; | |
5851 | + else if (sz < NAME_MAX) { | |
5852 | + BUILD_BUG_ON(AUFS_RDBLK_DEF < NAME_MAX); | |
5853 | + sz = AUFS_RDBLK_DEF; | |
5854 | + } | |
5855 | + return sz; | |
5856 | +} | |
5857 | + | |
1facf9fc | 5858 | +/* ---------------------------------------------------------------------- */ |
5859 | + | |
5860 | +static int reopen_dir(struct file *file) | |
5861 | +{ | |
5862 | + int err; | |
5863 | + unsigned int flags; | |
5864 | + aufs_bindex_t bindex, btail, bstart; | |
5865 | + struct dentry *dentry, *h_dentry; | |
5866 | + struct file *h_file; | |
5867 | + | |
5868 | + /* open all lower dirs */ | |
5869 | + dentry = file->f_dentry; | |
5870 | + bstart = au_dbstart(dentry); | |
5871 | + for (bindex = au_fbstart(file); bindex < bstart; bindex++) | |
5872 | + au_set_h_fptr(file, bindex, NULL); | |
5873 | + au_set_fbstart(file, bstart); | |
5874 | + | |
5875 | + btail = au_dbtaildir(dentry); | |
4a4d8108 | 5876 | + for (bindex = au_fbend_dir(file); btail < bindex; bindex--) |
1facf9fc | 5877 | + au_set_h_fptr(file, bindex, NULL); |
4a4d8108 | 5878 | + au_set_fbend_dir(file, btail); |
1facf9fc | 5879 | + |
4a4d8108 | 5880 | + flags = vfsub_file_flags(file); |
1facf9fc | 5881 | + for (bindex = bstart; bindex <= btail; bindex++) { |
5882 | + h_dentry = au_h_dptr(dentry, bindex); | |
5883 | + if (!h_dentry) | |
5884 | + continue; | |
4a4d8108 | 5885 | + h_file = au_hf_dir(file, bindex); |
1facf9fc | 5886 | + if (h_file) |
5887 | + continue; | |
5888 | + | |
5889 | + h_file = au_h_open(dentry, bindex, flags, file); | |
5890 | + err = PTR_ERR(h_file); | |
5891 | + if (IS_ERR(h_file)) | |
5892 | + goto out; /* close all? */ | |
5893 | + au_set_h_fptr(file, bindex, h_file); | |
5894 | + } | |
5895 | + au_update_figen(file); | |
5896 | + /* todo: necessary? */ | |
5897 | + /* file->f_ra = h_file->f_ra; */ | |
5898 | + err = 0; | |
5899 | + | |
4f0767ce | 5900 | +out: |
1facf9fc | 5901 | + return err; |
5902 | +} | |
5903 | + | |
5904 | +static int do_open_dir(struct file *file, int flags) | |
5905 | +{ | |
5906 | + int err; | |
5907 | + aufs_bindex_t bindex, btail; | |
5908 | + struct dentry *dentry, *h_dentry; | |
5909 | + struct file *h_file; | |
5910 | + | |
1308ab2a | 5911 | + FiMustWriteLock(file); |
5912 | + | |
1facf9fc | 5913 | + err = 0; |
5914 | + dentry = file->f_dentry; | |
1facf9fc | 5915 | + file->f_version = dentry->d_inode->i_version; |
5916 | + bindex = au_dbstart(dentry); | |
5917 | + au_set_fbstart(file, bindex); | |
5918 | + btail = au_dbtaildir(dentry); | |
4a4d8108 | 5919 | + au_set_fbend_dir(file, btail); |
1facf9fc | 5920 | + for (; !err && bindex <= btail; bindex++) { |
5921 | + h_dentry = au_h_dptr(dentry, bindex); | |
5922 | + if (!h_dentry) | |
5923 | + continue; | |
5924 | + | |
5925 | + h_file = au_h_open(dentry, bindex, flags, file); | |
5926 | + if (IS_ERR(h_file)) { | |
5927 | + err = PTR_ERR(h_file); | |
5928 | + break; | |
5929 | + } | |
5930 | + au_set_h_fptr(file, bindex, h_file); | |
5931 | + } | |
5932 | + au_update_figen(file); | |
5933 | + /* todo: necessary? */ | |
5934 | + /* file->f_ra = h_file->f_ra; */ | |
5935 | + if (!err) | |
5936 | + return 0; /* success */ | |
5937 | + | |
5938 | + /* close all */ | |
5939 | + for (bindex = au_fbstart(file); bindex <= btail; bindex++) | |
5940 | + au_set_h_fptr(file, bindex, NULL); | |
5941 | + au_set_fbstart(file, -1); | |
4a4d8108 AM |
5942 | + au_set_fbend_dir(file, -1); |
5943 | + | |
1facf9fc | 5944 | + return err; |
5945 | +} | |
5946 | + | |
5947 | +static int aufs_open_dir(struct inode *inode __maybe_unused, | |
5948 | + struct file *file) | |
5949 | +{ | |
4a4d8108 AM |
5950 | + int err; |
5951 | + struct super_block *sb; | |
5952 | + struct au_fidir *fidir; | |
5953 | + | |
5954 | + err = -ENOMEM; | |
5955 | + sb = file->f_dentry->d_sb; | |
5956 | + si_read_lock(sb, AuLock_FLUSH); | |
953406b4 | 5957 | + fidir = au_fidir_alloc(inode->i_sb); |
4a4d8108 AM |
5958 | + if (fidir) { |
5959 | + err = au_do_open(file, do_open_dir, fidir); | |
5960 | + if (unlikely(err)) | |
5961 | + kfree(fidir); | |
5962 | + } | |
5963 | + si_read_unlock(sb); | |
5964 | + return err; | |
1facf9fc | 5965 | +} |
5966 | + | |
5967 | +static int aufs_release_dir(struct inode *inode __maybe_unused, | |
5968 | + struct file *file) | |
5969 | +{ | |
5970 | + struct au_vdir *vdir_cache; | |
5971 | + struct super_block *sb; | |
4a4d8108 AM |
5972 | + struct au_finfo *finfo; |
5973 | + struct au_fidir *fidir; | |
5974 | + aufs_bindex_t bindex, bend; | |
1facf9fc | 5975 | + |
953406b4 | 5976 | + au_plink_maint_leave(file); |
1facf9fc | 5977 | + sb = file->f_dentry->d_sb; |
4a4d8108 AM |
5978 | + finfo = au_fi(file); |
5979 | + fidir = finfo->fi_hdir; | |
5980 | + if (fidir) { | |
5981 | + vdir_cache = fidir->fd_vdir_cache; /* lock-free */ | |
5982 | + if (vdir_cache) | |
5983 | + au_vdir_free(vdir_cache); | |
5984 | + | |
5985 | + bindex = finfo->fi_btop; | |
5986 | + if (bindex >= 0) { | |
5987 | + /* | |
5988 | + * calls fput() instead of filp_close(), | |
5989 | + * since no dnotify or lock for the lower file. | |
5990 | + */ | |
5991 | + bend = fidir->fd_bbot; | |
5992 | + for (; bindex <= bend; bindex++) | |
5993 | + au_set_h_fptr(file, bindex, NULL); | |
5994 | + } | |
5995 | + kfree(fidir); | |
5996 | + finfo->fi_hdir = NULL; | |
1facf9fc | 5997 | + } |
1facf9fc | 5998 | + au_finfo_fin(file); |
1facf9fc | 5999 | + return 0; |
6000 | +} | |
6001 | + | |
6002 | +/* ---------------------------------------------------------------------- */ | |
6003 | + | |
4a4d8108 AM |
6004 | +static int au_do_flush_dir(struct file *file, fl_owner_t id) |
6005 | +{ | |
6006 | + int err; | |
6007 | + aufs_bindex_t bindex, bend; | |
6008 | + struct file *h_file; | |
6009 | + | |
6010 | + err = 0; | |
6011 | + bend = au_fbend_dir(file); | |
6012 | + for (bindex = au_fbstart(file); !err && bindex <= bend; bindex++) { | |
6013 | + h_file = au_hf_dir(file, bindex); | |
6014 | + if (h_file) | |
6015 | + err = vfsub_flush(h_file, id); | |
6016 | + } | |
6017 | + return err; | |
6018 | +} | |
6019 | + | |
6020 | +static int aufs_flush_dir(struct file *file, fl_owner_t id) | |
6021 | +{ | |
6022 | + return au_do_flush(file, id, au_do_flush_dir); | |
6023 | +} | |
6024 | + | |
6025 | +/* ---------------------------------------------------------------------- */ | |
6026 | + | |
1facf9fc | 6027 | +static int au_do_fsync_dir_no_file(struct dentry *dentry, int datasync) |
6028 | +{ | |
6029 | + int err; | |
6030 | + aufs_bindex_t bend, bindex; | |
6031 | + struct inode *inode; | |
6032 | + struct super_block *sb; | |
6033 | + | |
6034 | + err = 0; | |
6035 | + sb = dentry->d_sb; | |
6036 | + inode = dentry->d_inode; | |
6037 | + IMustLock(inode); | |
6038 | + bend = au_dbend(dentry); | |
6039 | + for (bindex = au_dbstart(dentry); !err && bindex <= bend; bindex++) { | |
6040 | + struct path h_path; | |
6041 | + struct inode *h_inode; | |
6042 | + | |
6043 | + if (au_test_ro(sb, bindex, inode)) | |
6044 | + continue; | |
6045 | + h_path.dentry = au_h_dptr(dentry, bindex); | |
6046 | + if (!h_path.dentry) | |
6047 | + continue; | |
6048 | + h_inode = h_path.dentry->d_inode; | |
6049 | + if (!h_inode) | |
6050 | + continue; | |
6051 | + | |
6052 | + /* no mnt_want_write() */ | |
6053 | + /* cf. fs/nsfd/vfs.c and fs/nfsd/nfs4recover.c */ | |
6054 | + /* todo: inotiry fired? */ | |
6055 | + h_path.mnt = au_sbr_mnt(sb, bindex); | |
6056 | + mutex_lock(&h_inode->i_mutex); | |
6057 | + err = filemap_fdatawrite(h_inode->i_mapping); | |
6058 | + AuDebugOn(!h_inode->i_fop); | |
6059 | + if (!err && h_inode->i_fop->fsync) | |
b752ccd1 | 6060 | + err = h_inode->i_fop->fsync(NULL, datasync); |
1facf9fc | 6061 | + if (!err) |
6062 | + err = filemap_fdatawrite(h_inode->i_mapping); | |
6063 | + if (!err) | |
6064 | + vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/ | |
6065 | + mutex_unlock(&h_inode->i_mutex); | |
6066 | + } | |
6067 | + | |
6068 | + return err; | |
6069 | +} | |
6070 | + | |
6071 | +static int au_do_fsync_dir(struct file *file, int datasync) | |
6072 | +{ | |
6073 | + int err; | |
6074 | + aufs_bindex_t bend, bindex; | |
6075 | + struct file *h_file; | |
6076 | + struct super_block *sb; | |
6077 | + struct inode *inode; | |
6078 | + struct mutex *h_mtx; | |
6079 | + | |
6080 | + err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1); | |
6081 | + if (unlikely(err)) | |
6082 | + goto out; | |
6083 | + | |
6084 | + sb = file->f_dentry->d_sb; | |
6085 | + inode = file->f_dentry->d_inode; | |
4a4d8108 | 6086 | + bend = au_fbend_dir(file); |
1facf9fc | 6087 | + for (bindex = au_fbstart(file); !err && bindex <= bend; bindex++) { |
4a4d8108 | 6088 | + h_file = au_hf_dir(file, bindex); |
1facf9fc | 6089 | + if (!h_file || au_test_ro(sb, bindex, inode)) |
6090 | + continue; | |
6091 | + | |
b752ccd1 | 6092 | + err = vfs_fsync(h_file, datasync); |
1facf9fc | 6093 | + if (!err) { |
6094 | + h_mtx = &h_file->f_dentry->d_inode->i_mutex; | |
6095 | + mutex_lock(h_mtx); | |
6096 | + vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); | |
6097 | + /*ignore*/ | |
6098 | + mutex_unlock(h_mtx); | |
6099 | + } | |
6100 | + } | |
6101 | + | |
4f0767ce | 6102 | +out: |
1facf9fc | 6103 | + return err; |
6104 | +} | |
6105 | + | |
6106 | +/* | |
6107 | + * @file may be NULL | |
6108 | + */ | |
b752ccd1 | 6109 | +static int aufs_fsync_dir(struct file *file, int datasync) |
1facf9fc | 6110 | +{ |
6111 | + int err; | |
b752ccd1 | 6112 | + struct dentry *dentry; |
1facf9fc | 6113 | + struct super_block *sb; |
6114 | + | |
b752ccd1 | 6115 | + dentry = file->f_dentry; |
1facf9fc | 6116 | + IMustLock(dentry->d_inode); |
6117 | + | |
6118 | + err = 0; | |
6119 | + sb = dentry->d_sb; | |
6120 | + si_noflush_read_lock(sb); | |
6121 | + if (file) | |
6122 | + err = au_do_fsync_dir(file, datasync); | |
6123 | + else { | |
6124 | + di_write_lock_child(dentry); | |
6125 | + err = au_do_fsync_dir_no_file(dentry, datasync); | |
6126 | + } | |
6127 | + au_cpup_attr_timesizes(dentry->d_inode); | |
6128 | + di_write_unlock(dentry); | |
6129 | + if (file) | |
6130 | + fi_write_unlock(file); | |
6131 | + | |
6132 | + si_read_unlock(sb); | |
6133 | + return err; | |
6134 | +} | |
6135 | + | |
6136 | +/* ---------------------------------------------------------------------- */ | |
6137 | + | |
6138 | +static int aufs_readdir(struct file *file, void *dirent, filldir_t filldir) | |
6139 | +{ | |
6140 | + int err; | |
6141 | + struct dentry *dentry; | |
6142 | + struct inode *inode; | |
6143 | + struct super_block *sb; | |
6144 | + | |
6145 | + dentry = file->f_dentry; | |
6146 | + inode = dentry->d_inode; | |
6147 | + IMustLock(inode); | |
6148 | + | |
6149 | + sb = dentry->d_sb; | |
6150 | + si_read_lock(sb, AuLock_FLUSH); | |
6151 | + err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1); | |
6152 | + if (unlikely(err)) | |
6153 | + goto out; | |
6154 | + err = au_vdir_init(file); | |
6155 | + di_downgrade_lock(dentry, AuLock_IR); | |
6156 | + if (unlikely(err)) | |
6157 | + goto out_unlock; | |
6158 | + | |
b752ccd1 | 6159 | + if (!au_test_nfsd()) { |
1facf9fc | 6160 | + err = au_vdir_fill_de(file, dirent, filldir); |
6161 | + fsstack_copy_attr_atime(inode, | |
6162 | + au_h_iptr(inode, au_ibstart(inode))); | |
6163 | + } else { | |
6164 | + /* | |
6165 | + * nfsd filldir may call lookup_one_len(), vfs_getattr(), | |
6166 | + * encode_fh() and others. | |
6167 | + */ | |
6168 | + struct inode *h_inode = au_h_iptr(inode, au_ibstart(inode)); | |
6169 | + | |
6170 | + di_read_unlock(dentry, AuLock_IR); | |
6171 | + si_read_unlock(sb); | |
1facf9fc | 6172 | + err = au_vdir_fill_de(file, dirent, filldir); |
1facf9fc | 6173 | + fsstack_copy_attr_atime(inode, h_inode); |
6174 | + fi_write_unlock(file); | |
6175 | + | |
6176 | + AuTraceErr(err); | |
6177 | + return err; | |
6178 | + } | |
6179 | + | |
4f0767ce | 6180 | +out_unlock: |
1facf9fc | 6181 | + di_read_unlock(dentry, AuLock_IR); |
6182 | + fi_write_unlock(file); | |
4f0767ce | 6183 | +out: |
1facf9fc | 6184 | + si_read_unlock(sb); |
6185 | + return err; | |
6186 | +} | |
6187 | + | |
6188 | +/* ---------------------------------------------------------------------- */ | |
6189 | + | |
6190 | +#define AuTestEmpty_WHONLY 1 | |
dece6358 AM |
6191 | +#define AuTestEmpty_CALLED (1 << 1) |
6192 | +#define AuTestEmpty_SHWH (1 << 2) | |
1facf9fc | 6193 | +#define au_ftest_testempty(flags, name) ((flags) & AuTestEmpty_##name) |
6194 | +#define au_fset_testempty(flags, name) { (flags) |= AuTestEmpty_##name; } | |
6195 | +#define au_fclr_testempty(flags, name) { (flags) &= ~AuTestEmpty_##name; } | |
6196 | + | |
dece6358 AM |
6197 | +#ifndef CONFIG_AUFS_SHWH |
6198 | +#undef AuTestEmpty_SHWH | |
6199 | +#define AuTestEmpty_SHWH 0 | |
6200 | +#endif | |
6201 | + | |
1facf9fc | 6202 | +struct test_empty_arg { |
1308ab2a | 6203 | + struct au_nhash *whlist; |
1facf9fc | 6204 | + unsigned int flags; |
6205 | + int err; | |
6206 | + aufs_bindex_t bindex; | |
6207 | +}; | |
6208 | + | |
6209 | +static int test_empty_cb(void *__arg, const char *__name, int namelen, | |
dece6358 AM |
6210 | + loff_t offset __maybe_unused, u64 ino, |
6211 | + unsigned int d_type) | |
1facf9fc | 6212 | +{ |
6213 | + struct test_empty_arg *arg = __arg; | |
6214 | + char *name = (void *)__name; | |
6215 | + | |
6216 | + arg->err = 0; | |
6217 | + au_fset_testempty(arg->flags, CALLED); | |
6218 | + /* smp_mb(); */ | |
6219 | + if (name[0] == '.' | |
6220 | + && (namelen == 1 || (name[1] == '.' && namelen == 2))) | |
6221 | + goto out; /* success */ | |
6222 | + | |
6223 | + if (namelen <= AUFS_WH_PFX_LEN | |
6224 | + || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { | |
6225 | + if (au_ftest_testempty(arg->flags, WHONLY) | |
1308ab2a | 6226 | + && !au_nhash_test_known_wh(arg->whlist, name, namelen)) |
1facf9fc | 6227 | + arg->err = -ENOTEMPTY; |
6228 | + goto out; | |
6229 | + } | |
6230 | + | |
6231 | + name += AUFS_WH_PFX_LEN; | |
6232 | + namelen -= AUFS_WH_PFX_LEN; | |
1308ab2a | 6233 | + if (!au_nhash_test_known_wh(arg->whlist, name, namelen)) |
1facf9fc | 6234 | + arg->err = au_nhash_append_wh |
1308ab2a | 6235 | + (arg->whlist, name, namelen, ino, d_type, arg->bindex, |
dece6358 | 6236 | + au_ftest_testempty(arg->flags, SHWH)); |
1facf9fc | 6237 | + |
4f0767ce | 6238 | +out: |
1facf9fc | 6239 | + /* smp_mb(); */ |
6240 | + AuTraceErr(arg->err); | |
6241 | + return arg->err; | |
6242 | +} | |
6243 | + | |
6244 | +static int do_test_empty(struct dentry *dentry, struct test_empty_arg *arg) | |
6245 | +{ | |
6246 | + int err; | |
6247 | + struct file *h_file; | |
6248 | + | |
6249 | + h_file = au_h_open(dentry, arg->bindex, | |
6250 | + O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_LARGEFILE, | |
6251 | + /*file*/NULL); | |
6252 | + err = PTR_ERR(h_file); | |
6253 | + if (IS_ERR(h_file)) | |
6254 | + goto out; | |
6255 | + | |
6256 | + err = 0; | |
6257 | + if (!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE) | |
6258 | + && !h_file->f_dentry->d_inode->i_nlink) | |
6259 | + goto out_put; | |
6260 | + | |
6261 | + do { | |
6262 | + arg->err = 0; | |
6263 | + au_fclr_testempty(arg->flags, CALLED); | |
6264 | + /* smp_mb(); */ | |
6265 | + err = vfsub_readdir(h_file, test_empty_cb, arg); | |
6266 | + if (err >= 0) | |
6267 | + err = arg->err; | |
6268 | + } while (!err && au_ftest_testempty(arg->flags, CALLED)); | |
6269 | + | |
4f0767ce | 6270 | +out_put: |
1facf9fc | 6271 | + fput(h_file); |
6272 | + au_sbr_put(dentry->d_sb, arg->bindex); | |
4f0767ce | 6273 | +out: |
1facf9fc | 6274 | + return err; |
6275 | +} | |
6276 | + | |
6277 | +struct do_test_empty_args { | |
6278 | + int *errp; | |
6279 | + struct dentry *dentry; | |
6280 | + struct test_empty_arg *arg; | |
6281 | +}; | |
6282 | + | |
6283 | +static void call_do_test_empty(void *args) | |
6284 | +{ | |
6285 | + struct do_test_empty_args *a = args; | |
6286 | + *a->errp = do_test_empty(a->dentry, a->arg); | |
6287 | +} | |
6288 | + | |
6289 | +static int sio_test_empty(struct dentry *dentry, struct test_empty_arg *arg) | |
6290 | +{ | |
6291 | + int err, wkq_err; | |
6292 | + struct dentry *h_dentry; | |
6293 | + struct inode *h_inode; | |
6294 | + | |
6295 | + h_dentry = au_h_dptr(dentry, arg->bindex); | |
6296 | + h_inode = h_dentry->d_inode; | |
6297 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); | |
6298 | + err = au_test_h_perm_sio(h_inode, MAY_EXEC | MAY_READ); | |
6299 | + mutex_unlock(&h_inode->i_mutex); | |
6300 | + if (!err) | |
6301 | + err = do_test_empty(dentry, arg); | |
6302 | + else { | |
6303 | + struct do_test_empty_args args = { | |
6304 | + .errp = &err, | |
6305 | + .dentry = dentry, | |
6306 | + .arg = arg | |
6307 | + }; | |
6308 | + unsigned int flags = arg->flags; | |
6309 | + | |
6310 | + wkq_err = au_wkq_wait(call_do_test_empty, &args); | |
6311 | + if (unlikely(wkq_err)) | |
6312 | + err = wkq_err; | |
6313 | + arg->flags = flags; | |
6314 | + } | |
6315 | + | |
6316 | + return err; | |
6317 | +} | |
6318 | + | |
6319 | +int au_test_empty_lower(struct dentry *dentry) | |
6320 | +{ | |
6321 | + int err; | |
1308ab2a | 6322 | + unsigned int rdhash; |
1facf9fc | 6323 | + aufs_bindex_t bindex, bstart, btail; |
1308ab2a | 6324 | + struct au_nhash whlist; |
1facf9fc | 6325 | + struct test_empty_arg arg; |
1facf9fc | 6326 | + |
dece6358 AM |
6327 | + SiMustAnyLock(dentry->d_sb); |
6328 | + | |
1308ab2a | 6329 | + rdhash = au_sbi(dentry->d_sb)->si_rdhash; |
6330 | + if (!rdhash) | |
6331 | + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, dentry)); | |
6332 | + err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS); | |
dece6358 | 6333 | + if (unlikely(err)) |
1facf9fc | 6334 | + goto out; |
6335 | + | |
1facf9fc | 6336 | + arg.flags = 0; |
1308ab2a | 6337 | + arg.whlist = &whlist; |
6338 | + bstart = au_dbstart(dentry); | |
dece6358 AM |
6339 | + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)) |
6340 | + au_fset_testempty(arg.flags, SHWH); | |
1facf9fc | 6341 | + arg.bindex = bstart; |
6342 | + err = do_test_empty(dentry, &arg); | |
6343 | + if (unlikely(err)) | |
6344 | + goto out_whlist; | |
6345 | + | |
6346 | + au_fset_testempty(arg.flags, WHONLY); | |
6347 | + btail = au_dbtaildir(dentry); | |
6348 | + for (bindex = bstart + 1; !err && bindex <= btail; bindex++) { | |
6349 | + struct dentry *h_dentry; | |
6350 | + | |
6351 | + h_dentry = au_h_dptr(dentry, bindex); | |
6352 | + if (h_dentry && h_dentry->d_inode) { | |
6353 | + arg.bindex = bindex; | |
6354 | + err = do_test_empty(dentry, &arg); | |
6355 | + } | |
6356 | + } | |
6357 | + | |
4f0767ce | 6358 | +out_whlist: |
1308ab2a | 6359 | + au_nhash_wh_free(&whlist); |
4f0767ce | 6360 | +out: |
1facf9fc | 6361 | + return err; |
6362 | +} | |
6363 | + | |
6364 | +int au_test_empty(struct dentry *dentry, struct au_nhash *whlist) | |
6365 | +{ | |
6366 | + int err; | |
6367 | + struct test_empty_arg arg; | |
6368 | + aufs_bindex_t bindex, btail; | |
6369 | + | |
6370 | + err = 0; | |
1308ab2a | 6371 | + arg.whlist = whlist; |
1facf9fc | 6372 | + arg.flags = AuTestEmpty_WHONLY; |
dece6358 AM |
6373 | + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)) |
6374 | + au_fset_testempty(arg.flags, SHWH); | |
1facf9fc | 6375 | + btail = au_dbtaildir(dentry); |
6376 | + for (bindex = au_dbstart(dentry); !err && bindex <= btail; bindex++) { | |
6377 | + struct dentry *h_dentry; | |
6378 | + | |
6379 | + h_dentry = au_h_dptr(dentry, bindex); | |
6380 | + if (h_dentry && h_dentry->d_inode) { | |
6381 | + arg.bindex = bindex; | |
6382 | + err = sio_test_empty(dentry, &arg); | |
6383 | + } | |
6384 | + } | |
6385 | + | |
6386 | + return err; | |
6387 | +} | |
6388 | + | |
6389 | +/* ---------------------------------------------------------------------- */ | |
6390 | + | |
6391 | +const struct file_operations aufs_dir_fop = { | |
4a4d8108 | 6392 | + .owner = THIS_MODULE, |
1facf9fc | 6393 | + .read = generic_read_dir, |
6394 | + .readdir = aufs_readdir, | |
6395 | + .unlocked_ioctl = aufs_ioctl_dir, | |
b752ccd1 AM |
6396 | +#ifdef CONFIG_COMPAT |
6397 | + .compat_ioctl = aufs_compat_ioctl_dir, | |
6398 | +#endif | |
1facf9fc | 6399 | + .open = aufs_open_dir, |
6400 | + .release = aufs_release_dir, | |
4a4d8108 | 6401 | + .flush = aufs_flush_dir, |
1facf9fc | 6402 | + .fsync = aufs_fsync_dir |
6403 | +}; | |
b752ccd1 AM |
6404 | diff -urN /usr/share/empty/fs/aufs/dir.h linux/fs/aufs/dir.h |
6405 | --- /usr/share/empty/fs/aufs/dir.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 6406 | +++ linux/fs/aufs/dir.h 2010-10-21 09:52:43.086957936 +0200 |
b752ccd1 | 6407 | @@ -0,0 +1,138 @@ |
1facf9fc | 6408 | +/* |
4a4d8108 | 6409 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 6410 | + * |
6411 | + * This program, aufs is free software; you can redistribute it and/or modify | |
6412 | + * it under the terms of the GNU General Public License as published by | |
6413 | + * the Free Software Foundation; either version 2 of the License, or | |
6414 | + * (at your option) any later version. | |
dece6358 AM |
6415 | + * |
6416 | + * This program is distributed in the hope that it will be useful, | |
6417 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
6418 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
6419 | + * GNU General Public License for more details. | |
6420 | + * | |
6421 | + * You should have received a copy of the GNU General Public License | |
6422 | + * along with this program; if not, write to the Free Software | |
6423 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 6424 | + */ |
6425 | + | |
6426 | +/* | |
6427 | + * directory operations | |
6428 | + */ | |
6429 | + | |
6430 | +#ifndef __AUFS_DIR_H__ | |
6431 | +#define __AUFS_DIR_H__ | |
6432 | + | |
6433 | +#ifdef __KERNEL__ | |
6434 | + | |
6435 | +#include <linux/fs.h> | |
6436 | +#include <linux/aufs_type.h> | |
6437 | + | |
6438 | +/* ---------------------------------------------------------------------- */ | |
6439 | + | |
6440 | +/* need to be faster and smaller */ | |
6441 | + | |
6442 | +struct au_nhash { | |
dece6358 AM |
6443 | + unsigned int nh_num; |
6444 | + struct hlist_head *nh_head; | |
1facf9fc | 6445 | +}; |
6446 | + | |
6447 | +struct au_vdir_destr { | |
6448 | + unsigned char len; | |
6449 | + unsigned char name[0]; | |
6450 | +} __packed; | |
6451 | + | |
6452 | +struct au_vdir_dehstr { | |
6453 | + struct hlist_node hash; | |
6454 | + struct au_vdir_destr *str; | |
4a4d8108 | 6455 | +} ____cacheline_aligned_in_smp; |
1facf9fc | 6456 | + |
6457 | +struct au_vdir_de { | |
6458 | + ino_t de_ino; | |
6459 | + unsigned char de_type; | |
6460 | + /* caution: packed */ | |
6461 | + struct au_vdir_destr de_str; | |
6462 | +} __packed; | |
6463 | + | |
6464 | +struct au_vdir_wh { | |
6465 | + struct hlist_node wh_hash; | |
dece6358 AM |
6466 | +#ifdef CONFIG_AUFS_SHWH |
6467 | + ino_t wh_ino; | |
1facf9fc | 6468 | + aufs_bindex_t wh_bindex; |
dece6358 AM |
6469 | + unsigned char wh_type; |
6470 | +#else | |
6471 | + aufs_bindex_t wh_bindex; | |
6472 | +#endif | |
6473 | + /* caution: packed */ | |
1facf9fc | 6474 | + struct au_vdir_destr wh_str; |
6475 | +} __packed; | |
6476 | + | |
6477 | +union au_vdir_deblk_p { | |
6478 | + unsigned char *deblk; | |
6479 | + struct au_vdir_de *de; | |
6480 | +}; | |
6481 | + | |
6482 | +struct au_vdir { | |
6483 | + unsigned char **vd_deblk; | |
6484 | + unsigned long vd_nblk; | |
1facf9fc | 6485 | + struct { |
6486 | + unsigned long ul; | |
6487 | + union au_vdir_deblk_p p; | |
6488 | + } vd_last; | |
6489 | + | |
6490 | + unsigned long vd_version; | |
dece6358 | 6491 | + unsigned int vd_deblk_sz; |
1facf9fc | 6492 | + unsigned long vd_jiffy; |
4a4d8108 | 6493 | +} ____cacheline_aligned_in_smp; |
1facf9fc | 6494 | + |
6495 | +/* ---------------------------------------------------------------------- */ | |
6496 | + | |
6497 | +/* dir.c */ | |
6498 | +extern const struct file_operations aufs_dir_fop; | |
6499 | +void au_add_nlink(struct inode *dir, struct inode *h_dir); | |
6500 | +void au_sub_nlink(struct inode *dir, struct inode *h_dir); | |
1308ab2a | 6501 | +loff_t au_dir_size(struct file *file, struct dentry *dentry); |
1facf9fc | 6502 | +int au_test_empty_lower(struct dentry *dentry); |
6503 | +int au_test_empty(struct dentry *dentry, struct au_nhash *whlist); | |
6504 | + | |
6505 | +/* vdir.c */ | |
1308ab2a | 6506 | +unsigned int au_rdhash_est(loff_t sz); |
dece6358 AM |
6507 | +int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp); |
6508 | +void au_nhash_wh_free(struct au_nhash *whlist); | |
1facf9fc | 6509 | +int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt, |
6510 | + int limit); | |
dece6358 AM |
6511 | +int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen); |
6512 | +int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino, | |
6513 | + unsigned int d_type, aufs_bindex_t bindex, | |
6514 | + unsigned char shwh); | |
1facf9fc | 6515 | +void au_vdir_free(struct au_vdir *vdir); |
6516 | +int au_vdir_init(struct file *file); | |
6517 | +int au_vdir_fill_de(struct file *file, void *dirent, filldir_t filldir); | |
6518 | + | |
6519 | +/* ioctl.c */ | |
6520 | +long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg); | |
6521 | + | |
1308ab2a | 6522 | +#ifdef CONFIG_AUFS_RDU |
6523 | +/* rdu.c */ | |
6524 | +long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg); | |
b752ccd1 AM |
6525 | +#ifdef CONFIG_COMPAT |
6526 | +long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, | |
6527 | + unsigned long arg); | |
6528 | +#endif | |
1308ab2a | 6529 | +#else |
6530 | +static inline long au_rdu_ioctl(struct file *file, unsigned int cmd, | |
6531 | + unsigned long arg) | |
6532 | +{ | |
6533 | + return -EINVAL; | |
6534 | +} | |
b752ccd1 AM |
6535 | +#ifdef CONFIG_COMPAT |
6536 | +static inline long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, | |
6537 | + unsigned long arg) | |
6538 | +{ | |
6539 | + return -EINVAL; | |
6540 | +} | |
6541 | +#endif | |
1308ab2a | 6542 | +#endif |
6543 | + | |
1facf9fc | 6544 | +#endif /* __KERNEL__ */ |
6545 | +#endif /* __AUFS_DIR_H__ */ | |
b752ccd1 AM |
6546 | diff -urN /usr/share/empty/fs/aufs/dynop.c linux/fs/aufs/dynop.c |
6547 | --- /usr/share/empty/fs/aufs/dynop.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 6548 | +++ linux/fs/aufs/dynop.c 2010-10-21 09:52:43.086957936 +0200 |
b752ccd1 | 6549 | @@ -0,0 +1,425 @@ |
1facf9fc | 6550 | +/* |
4a4d8108 | 6551 | + * Copyright (C) 2010 Junjiro R. Okajima |
1facf9fc | 6552 | + * |
6553 | + * This program, aufs is free software; you can redistribute it and/or modify | |
6554 | + * it under the terms of the GNU General Public License as published by | |
6555 | + * the Free Software Foundation; either version 2 of the License, or | |
6556 | + * (at your option) any later version. | |
dece6358 AM |
6557 | + * |
6558 | + * This program is distributed in the hope that it will be useful, | |
6559 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
6560 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
6561 | + * GNU General Public License for more details. | |
6562 | + * | |
6563 | + * You should have received a copy of the GNU General Public License | |
6564 | + * along with this program; if not, write to the Free Software | |
6565 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 6566 | + */ |
6567 | + | |
6568 | +/* | |
4a4d8108 | 6569 | + * dynamically customizable operations for regular files |
1facf9fc | 6570 | + */ |
6571 | + | |
1facf9fc | 6572 | +#include "aufs.h" |
6573 | + | |
4a4d8108 | 6574 | +#define DyPrSym(key) AuDbgSym(key->dk_op.dy_hop) |
1facf9fc | 6575 | + |
4a4d8108 AM |
6576 | +/* |
6577 | + * How large will these lists be? | |
6578 | + * Usually just a few elements, 20-30 at most for each, I guess. | |
6579 | + */ | |
6580 | +static struct au_splhead dynop[AuDyLast]; | |
6581 | + | |
6582 | +static struct au_dykey *dy_gfind_get(struct au_splhead *spl, const void *h_op) | |
1facf9fc | 6583 | +{ |
4a4d8108 AM |
6584 | + struct au_dykey *key, *tmp; |
6585 | + struct list_head *head; | |
1facf9fc | 6586 | + |
4a4d8108 AM |
6587 | + key = NULL; |
6588 | + head = &spl->head; | |
6589 | + rcu_read_lock(); | |
6590 | + list_for_each_entry_rcu(tmp, head, dk_list) | |
6591 | + if (tmp->dk_op.dy_hop == h_op) { | |
6592 | + key = tmp; | |
6593 | + kref_get(&key->dk_kref); | |
6594 | + break; | |
6595 | + } | |
6596 | + rcu_read_unlock(); | |
6597 | + | |
6598 | + return key; | |
1facf9fc | 6599 | +} |
6600 | + | |
4a4d8108 | 6601 | +static struct au_dykey *dy_bradd(struct au_branch *br, struct au_dykey *key) |
1facf9fc | 6602 | +{ |
4a4d8108 AM |
6603 | + struct au_dykey **k, *found; |
6604 | + const void *h_op = key->dk_op.dy_hop; | |
6605 | + int i; | |
1facf9fc | 6606 | + |
4a4d8108 AM |
6607 | + found = NULL; |
6608 | + k = br->br_dykey; | |
6609 | + for (i = 0; i < AuBrDynOp; i++) | |
6610 | + if (k[i]) { | |
6611 | + if (k[i]->dk_op.dy_hop == h_op) { | |
6612 | + found = k[i]; | |
6613 | + break; | |
6614 | + } | |
6615 | + } else | |
6616 | + break; | |
6617 | + if (!found) { | |
6618 | + spin_lock(&br->br_dykey_lock); | |
6619 | + for (; i < AuBrDynOp; i++) | |
6620 | + if (k[i]) { | |
6621 | + if (k[i]->dk_op.dy_hop == h_op) { | |
6622 | + found = k[i]; | |
6623 | + break; | |
6624 | + } | |
6625 | + } else { | |
6626 | + k[i] = key; | |
6627 | + break; | |
6628 | + } | |
6629 | + spin_unlock(&br->br_dykey_lock); | |
6630 | + BUG_ON(i == AuBrDynOp); /* expand the array */ | |
6631 | + } | |
6632 | + | |
6633 | + return found; | |
1facf9fc | 6634 | +} |
6635 | + | |
4a4d8108 AM |
6636 | +/* kref_get() if @key is already added */ |
6637 | +static struct au_dykey *dy_gadd(struct au_splhead *spl, struct au_dykey *key) | |
6638 | +{ | |
6639 | + struct au_dykey *tmp, *found; | |
6640 | + struct list_head *head; | |
6641 | + const void *h_op = key->dk_op.dy_hop; | |
1facf9fc | 6642 | + |
4a4d8108 AM |
6643 | + found = NULL; |
6644 | + head = &spl->head; | |
6645 | + spin_lock(&spl->spin); | |
6646 | + list_for_each_entry(tmp, head, dk_list) | |
6647 | + if (tmp->dk_op.dy_hop == h_op) { | |
6648 | + kref_get(&tmp->dk_kref); | |
6649 | + found = tmp; | |
6650 | + break; | |
6651 | + } | |
6652 | + if (!found) | |
6653 | + list_add_rcu(&key->dk_list, head); | |
6654 | + spin_unlock(&spl->spin); | |
1facf9fc | 6655 | + |
4a4d8108 AM |
6656 | + if (!found) |
6657 | + DyPrSym(key); | |
6658 | + return found; | |
6659 | +} | |
6660 | + | |
6661 | +static void dy_free_rcu(struct rcu_head *rcu) | |
1facf9fc | 6662 | +{ |
4a4d8108 AM |
6663 | + struct au_dykey *key; |
6664 | + | |
6665 | + key = container_of(rcu, struct au_dykey, dk_rcu); | |
6666 | + DyPrSym(key); | |
6667 | + kfree(key); | |
1facf9fc | 6668 | +} |
6669 | + | |
4a4d8108 AM |
6670 | +static void dy_free(struct kref *kref) |
6671 | +{ | |
6672 | + struct au_dykey *key; | |
6673 | + struct au_splhead *spl; | |
1facf9fc | 6674 | + |
4a4d8108 AM |
6675 | + key = container_of(kref, struct au_dykey, dk_kref); |
6676 | + spl = dynop + key->dk_op.dy_type; | |
6677 | + au_spl_del_rcu(&key->dk_list, spl); | |
6678 | + call_rcu(&key->dk_rcu, dy_free_rcu); | |
6679 | +} | |
6680 | + | |
6681 | +void au_dy_put(struct au_dykey *key) | |
1facf9fc | 6682 | +{ |
4a4d8108 AM |
6683 | + kref_put(&key->dk_kref, dy_free); |
6684 | +} | |
1facf9fc | 6685 | + |
4a4d8108 AM |
6686 | +/* ---------------------------------------------------------------------- */ |
6687 | + | |
6688 | +#define DyDbgSize(cnt, op) AuDebugOn(cnt != sizeof(op)/sizeof(void *)) | |
6689 | + | |
6690 | +#ifdef CONFIG_AUFS_DEBUG | |
6691 | +#define DyDbgDeclare(cnt) unsigned int cnt = 0 | |
4f0767ce | 6692 | +#define DyDbgInc(cnt) do { cnt++; } while (0) |
4a4d8108 AM |
6693 | +#else |
6694 | +#define DyDbgDeclare(cnt) do {} while (0) | |
6695 | +#define DyDbgInc(cnt) do {} while (0) | |
6696 | +#endif | |
6697 | + | |
6698 | +#define DySet(func, dst, src, h_op, h_sb) do { \ | |
6699 | + DyDbgInc(cnt); \ | |
6700 | + if (h_op->func) { \ | |
6701 | + if (src.func) \ | |
6702 | + dst.func = src.func; \ | |
6703 | + else \ | |
6704 | + AuDbg("%s %s\n", au_sbtype(h_sb), #func); \ | |
6705 | + } \ | |
6706 | +} while (0) | |
6707 | + | |
6708 | +#define DySetForce(func, dst, src) do { \ | |
6709 | + AuDebugOn(!src.func); \ | |
6710 | + DyDbgInc(cnt); \ | |
6711 | + dst.func = src.func; \ | |
6712 | +} while (0) | |
6713 | + | |
6714 | +#define DySetAop(func) \ | |
6715 | + DySet(func, dyaop->da_op, aufs_aop, h_aop, h_sb) | |
6716 | +#define DySetAopForce(func) \ | |
6717 | + DySetForce(func, dyaop->da_op, aufs_aop) | |
6718 | + | |
6719 | +static void dy_aop(struct au_dykey *key, const void *h_op, | |
6720 | + struct super_block *h_sb __maybe_unused) | |
6721 | +{ | |
6722 | + struct au_dyaop *dyaop = (void *)key; | |
6723 | + const struct address_space_operations *h_aop = h_op; | |
6724 | + DyDbgDeclare(cnt); | |
6725 | + | |
6726 | + AuDbg("%s\n", au_sbtype(h_sb)); | |
6727 | + | |
6728 | + DySetAop(writepage); | |
6729 | + DySetAopForce(readpage); /* force */ | |
6730 | + DySetAop(sync_page); | |
6731 | + DySetAop(writepages); | |
6732 | + DySetAop(set_page_dirty); | |
6733 | + DySetAop(readpages); | |
6734 | + DySetAop(write_begin); | |
6735 | + DySetAop(write_end); | |
6736 | + DySetAop(bmap); | |
6737 | + DySetAop(invalidatepage); | |
6738 | + DySetAop(releasepage); | |
6739 | + /* these two will be changed according to an aufs mount option */ | |
6740 | + DySetAop(direct_IO); | |
6741 | + DySetAop(get_xip_mem); | |
6742 | + DySetAop(migratepage); | |
6743 | + DySetAop(launder_page); | |
6744 | + DySetAop(is_partially_uptodate); | |
6745 | + DySetAop(error_remove_page); | |
6746 | + | |
6747 | + DyDbgSize(cnt, *h_aop); | |
6748 | + dyaop->da_get_xip_mem = h_aop->get_xip_mem; | |
6749 | +} | |
6750 | + | |
6751 | +#define DySetVmop(func) \ | |
6752 | + DySet(func, dyvmop->dv_op, aufs_vm_ops, h_vmop, h_sb) | |
6753 | +#define DySetVmopForce(func) \ | |
6754 | + DySetForce(func, dyvmop->dv_op, aufs_vm_ops) | |
6755 | + | |
6756 | +static void dy_vmop(struct au_dykey *key, const void *h_op, | |
6757 | + struct super_block *h_sb __maybe_unused) | |
6758 | +{ | |
6759 | + struct au_dyvmop *dyvmop = (void *)key; | |
6760 | + const struct vm_operations_struct *h_vmop = h_op; | |
6761 | + DyDbgDeclare(cnt); | |
6762 | + | |
6763 | + AuDbg("%s\n", au_sbtype(h_sb)); | |
6764 | + | |
6765 | + DySetVmop(open); | |
6766 | + DySetVmop(close); | |
6767 | + DySetVmop(fault); | |
6768 | + DySetVmop(page_mkwrite); | |
6769 | + DySetVmop(access); | |
6770 | +#ifdef CONFIG_NUMA | |
6771 | + DySetVmop(set_policy); | |
6772 | + DySetVmop(get_policy); | |
6773 | + DySetVmop(migrate); | |
6774 | +#endif | |
6775 | + | |
6776 | + DyDbgSize(cnt, *h_vmop); | |
6777 | +} | |
6778 | + | |
6779 | +/* ---------------------------------------------------------------------- */ | |
6780 | + | |
6781 | +static void dy_bug(struct kref *kref) | |
6782 | +{ | |
6783 | + BUG(); | |
6784 | +} | |
6785 | + | |
6786 | +static struct au_dykey *dy_get(struct au_dynop *op, struct au_branch *br) | |
6787 | +{ | |
6788 | + struct au_dykey *key, *old; | |
6789 | + struct au_splhead *spl; | |
b752ccd1 | 6790 | + struct op { |
4a4d8108 | 6791 | + unsigned int sz; |
b752ccd1 AM |
6792 | + void (*set)(struct au_dykey *key, const void *h_op, |
6793 | + struct super_block *h_sb __maybe_unused); | |
6794 | + }; | |
6795 | + static const struct op a[] = { | |
4a4d8108 AM |
6796 | + [AuDy_AOP] = { |
6797 | + .sz = sizeof(struct au_dyaop), | |
b752ccd1 | 6798 | + .set = dy_aop |
4a4d8108 AM |
6799 | + }, |
6800 | + [AuDy_VMOP] = { | |
6801 | + .sz = sizeof(struct au_dyvmop), | |
b752ccd1 | 6802 | + .set = dy_vmop |
4a4d8108 | 6803 | + } |
b752ccd1 AM |
6804 | + }; |
6805 | + const struct op *p; | |
4a4d8108 AM |
6806 | + |
6807 | + spl = dynop + op->dy_type; | |
6808 | + key = dy_gfind_get(spl, op->dy_hop); | |
6809 | + if (key) | |
6810 | + goto out_add; /* success */ | |
6811 | + | |
6812 | + p = a + op->dy_type; | |
6813 | + key = kzalloc(p->sz, GFP_NOFS); | |
6814 | + if (unlikely(!key)) { | |
6815 | + key = ERR_PTR(-ENOMEM); | |
6816 | + goto out; | |
6817 | + } | |
6818 | + | |
6819 | + key->dk_op.dy_hop = op->dy_hop; | |
6820 | + kref_init(&key->dk_kref); | |
b752ccd1 | 6821 | + p->set(key, op->dy_hop, br->br_mnt->mnt_sb); |
4a4d8108 AM |
6822 | + old = dy_gadd(spl, key); |
6823 | + if (old) { | |
6824 | + kfree(key); | |
6825 | + key = old; | |
6826 | + } | |
6827 | + | |
6828 | +out_add: | |
6829 | + old = dy_bradd(br, key); | |
6830 | + if (old) | |
6831 | + /* its ref-count should never be zero here */ | |
6832 | + kref_put(&key->dk_kref, dy_bug); | |
6833 | +out: | |
6834 | + return key; | |
6835 | +} | |
6836 | + | |
6837 | +/* ---------------------------------------------------------------------- */ | |
6838 | +/* | |
6839 | + * Aufs prohibits O_DIRECT by defaut even if the branch supports it. | |
6840 | + * This behaviour is neccessary to return an error from open(O_DIRECT) instead | |
6841 | + * of the succeeding I/O. The dio mount option enables O_DIRECT and makes | |
6842 | + * open(O_DIRECT) always succeed, but the succeeding I/O may return an error. | |
6843 | + * See the aufs manual in detail. | |
6844 | + * | |
6845 | + * To keep this behaviour, aufs has to set NULL to ->get_xip_mem too, and the | |
6846 | + * performance of fadvise() and madvise() may be affected. | |
6847 | + */ | |
6848 | +static void dy_adx(struct au_dyaop *dyaop, int do_dx) | |
6849 | +{ | |
6850 | + if (!do_dx) { | |
6851 | + dyaop->da_op.direct_IO = NULL; | |
6852 | + dyaop->da_op.get_xip_mem = NULL; | |
6853 | + } else { | |
6854 | + dyaop->da_op.direct_IO = aufs_aop.direct_IO; | |
6855 | + dyaop->da_op.get_xip_mem = aufs_aop.get_xip_mem; | |
6856 | + if (!dyaop->da_get_xip_mem) | |
6857 | + dyaop->da_op.get_xip_mem = NULL; | |
6858 | + } | |
6859 | +} | |
6860 | + | |
6861 | +static struct au_dyaop *dy_aget(struct au_branch *br, | |
6862 | + const struct address_space_operations *h_aop, | |
6863 | + int do_dx) | |
6864 | +{ | |
6865 | + struct au_dyaop *dyaop; | |
6866 | + struct au_dynop op; | |
6867 | + | |
6868 | + op.dy_type = AuDy_AOP; | |
6869 | + op.dy_haop = h_aop; | |
6870 | + dyaop = (void *)dy_get(&op, br); | |
6871 | + if (IS_ERR(dyaop)) | |
6872 | + goto out; | |
6873 | + dy_adx(dyaop, do_dx); | |
6874 | + | |
6875 | +out: | |
6876 | + return dyaop; | |
6877 | +} | |
6878 | + | |
6879 | +int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex, | |
6880 | + struct inode *h_inode) | |
6881 | +{ | |
6882 | + int err, do_dx; | |
6883 | + struct super_block *sb; | |
6884 | + struct au_branch *br; | |
6885 | + struct au_dyaop *dyaop; | |
6886 | + | |
6887 | + AuDebugOn(!S_ISREG(h_inode->i_mode)); | |
6888 | + IiMustWriteLock(inode); | |
6889 | + | |
6890 | + sb = inode->i_sb; | |
6891 | + br = au_sbr(sb, bindex); | |
6892 | + do_dx = !!au_opt_test(au_mntflags(sb), DIO); | |
6893 | + dyaop = dy_aget(br, h_inode->i_mapping->a_ops, do_dx); | |
6894 | + err = PTR_ERR(dyaop); | |
6895 | + if (IS_ERR(dyaop)) | |
6896 | + /* unnecessary to call dy_fput() */ | |
6897 | + goto out; | |
6898 | + | |
6899 | + err = 0; | |
6900 | + inode->i_mapping->a_ops = &dyaop->da_op; | |
6901 | + | |
6902 | +out: | |
6903 | + return err; | |
6904 | +} | |
6905 | + | |
b752ccd1 AM |
6906 | +/* |
6907 | + * Is it safe to replace a_ops during the inode/file is in operation? | |
6908 | + * Yes, I hope so. | |
6909 | + */ | |
6910 | +int au_dy_irefresh(struct inode *inode) | |
6911 | +{ | |
6912 | + int err; | |
6913 | + aufs_bindex_t bstart; | |
6914 | + struct inode *h_inode; | |
6915 | + | |
6916 | + err = 0; | |
6917 | + if (S_ISREG(inode->i_mode)) { | |
6918 | + bstart = au_ibstart(inode); | |
6919 | + h_inode = au_h_iptr(inode, bstart); | |
6920 | + err = au_dy_iaop(inode, bstart, h_inode); | |
6921 | + } | |
6922 | + return err; | |
6923 | +} | |
6924 | + | |
4a4d8108 AM |
6925 | +void au_dy_arefresh(int do_dx) |
6926 | +{ | |
6927 | + struct au_splhead *spl; | |
6928 | + struct list_head *head; | |
6929 | + struct au_dykey *key; | |
6930 | + | |
6931 | + spl = dynop + AuDy_AOP; | |
6932 | + head = &spl->head; | |
6933 | + spin_lock(&spl->spin); | |
6934 | + list_for_each_entry(key, head, dk_list) | |
6935 | + dy_adx((void *)key, do_dx); | |
6936 | + spin_unlock(&spl->spin); | |
6937 | +} | |
6938 | + | |
6939 | +const struct vm_operations_struct * | |
6940 | +au_dy_vmop(struct file *file, struct au_branch *br, | |
6941 | + const struct vm_operations_struct *h_vmop) | |
6942 | +{ | |
6943 | + struct au_dyvmop *dyvmop; | |
6944 | + struct au_dynop op; | |
6945 | + | |
6946 | + op.dy_type = AuDy_VMOP; | |
6947 | + op.dy_hvmop = h_vmop; | |
6948 | + dyvmop = (void *)dy_get(&op, br); | |
6949 | + if (IS_ERR(dyvmop)) | |
6950 | + return (void *)dyvmop; | |
6951 | + return &dyvmop->dv_op; | |
6952 | +} | |
6953 | + | |
6954 | +/* ---------------------------------------------------------------------- */ | |
6955 | + | |
6956 | +void __init au_dy_init(void) | |
6957 | +{ | |
6958 | + int i; | |
6959 | + | |
6960 | + /* make sure that 'struct au_dykey *' can be any type */ | |
6961 | + BUILD_BUG_ON(offsetof(struct au_dyaop, da_key)); | |
6962 | + BUILD_BUG_ON(offsetof(struct au_dyvmop, dv_key)); | |
6963 | + | |
6964 | + for (i = 0; i < AuDyLast; i++) | |
6965 | + au_spl_init(dynop + i); | |
6966 | +} | |
6967 | + | |
6968 | +void au_dy_fin(void) | |
6969 | +{ | |
6970 | + int i; | |
6971 | + | |
6972 | + for (i = 0; i < AuDyLast; i++) | |
6973 | + WARN_ON(!list_empty(&dynop[i].head)); | |
6974 | +} | |
b752ccd1 AM |
6975 | diff -urN /usr/share/empty/fs/aufs/dynop.h linux/fs/aufs/dynop.h |
6976 | --- /usr/share/empty/fs/aufs/dynop.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 6977 | +++ linux/fs/aufs/dynop.h 2010-10-21 09:52:43.086957936 +0200 |
b752ccd1 | 6978 | @@ -0,0 +1,89 @@ |
4a4d8108 AM |
6979 | +/* |
6980 | + * Copyright (C) 2010 Junjiro R. Okajima | |
6981 | + * | |
6982 | + * This program, aufs is free software; you can redistribute it and/or modify | |
6983 | + * it under the terms of the GNU General Public License as published by | |
6984 | + * the Free Software Foundation; either version 2 of the License, or | |
6985 | + * (at your option) any later version. | |
6986 | + * | |
6987 | + * This program is distributed in the hope that it will be useful, | |
6988 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
6989 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
6990 | + * GNU General Public License for more details. | |
6991 | + * | |
6992 | + * You should have received a copy of the GNU General Public License | |
6993 | + * along with this program; if not, write to the Free Software | |
6994 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
6995 | + */ | |
6996 | + | |
6997 | +/* | |
6998 | + * dynamically customizable operations (for regular files only) | |
6999 | + */ | |
7000 | + | |
7001 | +#ifndef __AUFS_DYNOP_H__ | |
7002 | +#define __AUFS_DYNOP_H__ | |
7003 | + | |
7004 | +#ifdef __KERNEL__ | |
7005 | + | |
7006 | +#include <linux/fs.h> | |
7007 | +#include <linux/mm.h> | |
7008 | +#include <linux/rcupdate.h> | |
7009 | +#include <linux/aufs_type.h> | |
7010 | +#include "inode.h" | |
7011 | + | |
7012 | +enum {AuDy_AOP, AuDy_VMOP, AuDyLast}; | |
7013 | + | |
7014 | +struct au_dynop { | |
7015 | + int dy_type; | |
7016 | + union { | |
7017 | + const void *dy_hop; | |
7018 | + const struct address_space_operations *dy_haop; | |
7019 | + const struct vm_operations_struct *dy_hvmop; | |
7020 | + }; | |
7021 | +}; | |
7022 | + | |
7023 | +struct au_dykey { | |
7024 | + union { | |
7025 | + struct list_head dk_list; | |
7026 | + struct rcu_head dk_rcu; | |
7027 | + }; | |
7028 | + struct au_dynop dk_op; | |
7029 | + | |
7030 | + /* | |
7031 | + * during I am in the branch local array, kref is gotten. when the | |
7032 | + * branch is removed, kref is put. | |
7033 | + */ | |
7034 | + struct kref dk_kref; | |
7035 | +}; | |
7036 | + | |
7037 | +/* stop unioning since their sizes are very different from each other */ | |
7038 | +struct au_dyaop { | |
7039 | + struct au_dykey da_key; | |
7040 | + struct address_space_operations da_op; /* not const */ | |
7041 | + int (*da_get_xip_mem)(struct address_space *, pgoff_t, int, | |
7042 | + void **, unsigned long *); | |
7043 | +}; | |
7044 | + | |
7045 | +struct au_dyvmop { | |
7046 | + struct au_dykey dv_key; | |
7047 | + struct vm_operations_struct dv_op; /* not const */ | |
7048 | +}; | |
7049 | + | |
7050 | +/* ---------------------------------------------------------------------- */ | |
7051 | + | |
7052 | +/* dynop.c */ | |
7053 | +struct au_branch; | |
7054 | +void au_dy_put(struct au_dykey *key); | |
7055 | +int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex, | |
7056 | + struct inode *h_inode); | |
b752ccd1 | 7057 | +int au_dy_irefresh(struct inode *inode); |
4a4d8108 AM |
7058 | +void au_dy_arefresh(int do_dio); |
7059 | +const struct vm_operations_struct * | |
7060 | +au_dy_vmop(struct file *file, struct au_branch *br, | |
7061 | + const struct vm_operations_struct *h_vmop); | |
7062 | + | |
7063 | +void __init au_dy_init(void); | |
7064 | +void au_dy_fin(void); | |
7065 | + | |
4a4d8108 AM |
7066 | +#endif /* __KERNEL__ */ |
7067 | +#endif /* __AUFS_DYNOP_H__ */ | |
b752ccd1 AM |
7068 | diff -urN /usr/share/empty/fs/aufs/export.c linux/fs/aufs/export.c |
7069 | --- /usr/share/empty/fs/aufs/export.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 7070 | +++ linux/fs/aufs/export.c 2010-10-21 09:52:43.086957936 +0200 |
b752ccd1 | 7071 | @@ -0,0 +1,788 @@ |
4a4d8108 AM |
7072 | +/* |
7073 | + * Copyright (C) 2005-2010 Junjiro R. Okajima | |
7074 | + * | |
7075 | + * This program, aufs is free software; you can redistribute it and/or modify | |
7076 | + * it under the terms of the GNU General Public License as published by | |
7077 | + * the Free Software Foundation; either version 2 of the License, or | |
7078 | + * (at your option) any later version. | |
7079 | + * | |
7080 | + * This program is distributed in the hope that it will be useful, | |
7081 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7082 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
7083 | + * GNU General Public License for more details. | |
7084 | + * | |
7085 | + * You should have received a copy of the GNU General Public License | |
7086 | + * along with this program; if not, write to the Free Software | |
7087 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
7088 | + */ | |
7089 | + | |
7090 | +/* | |
7091 | + * export via nfs | |
7092 | + */ | |
7093 | + | |
7094 | +#include <linux/exportfs.h> | |
7095 | +#include <linux/file.h> | |
7096 | +#include <linux/mnt_namespace.h> | |
7097 | +#include <linux/namei.h> | |
7098 | +#include <linux/nsproxy.h> | |
7099 | +#include <linux/random.h> | |
7100 | +#include <linux/writeback.h> | |
7101 | +#include "aufs.h" | |
7102 | + | |
7103 | +union conv { | |
7104 | +#ifdef CONFIG_AUFS_INO_T_64 | |
7105 | + __u32 a[2]; | |
7106 | +#else | |
7107 | + __u32 a[1]; | |
7108 | +#endif | |
7109 | + ino_t ino; | |
7110 | +}; | |
7111 | + | |
7112 | +static ino_t decode_ino(__u32 *a) | |
7113 | +{ | |
7114 | + union conv u; | |
7115 | + | |
7116 | + BUILD_BUG_ON(sizeof(u.ino) != sizeof(u.a)); | |
7117 | + u.a[0] = a[0]; | |
7118 | +#ifdef CONFIG_AUFS_INO_T_64 | |
7119 | + u.a[1] = a[1]; | |
7120 | +#endif | |
7121 | + return u.ino; | |
7122 | +} | |
7123 | + | |
7124 | +static void encode_ino(__u32 *a, ino_t ino) | |
7125 | +{ | |
7126 | + union conv u; | |
7127 | + | |
7128 | + u.ino = ino; | |
7129 | + a[0] = u.a[0]; | |
7130 | +#ifdef CONFIG_AUFS_INO_T_64 | |
7131 | + a[1] = u.a[1]; | |
7132 | +#endif | |
7133 | +} | |
7134 | + | |
7135 | +/* NFS file handle */ | |
7136 | +enum { | |
7137 | + Fh_br_id, | |
7138 | + Fh_sigen, | |
7139 | +#ifdef CONFIG_AUFS_INO_T_64 | |
7140 | + /* support 64bit inode number */ | |
7141 | + Fh_ino1, | |
7142 | + Fh_ino2, | |
7143 | + Fh_dir_ino1, | |
7144 | + Fh_dir_ino2, | |
7145 | +#else | |
7146 | + Fh_ino1, | |
7147 | + Fh_dir_ino1, | |
7148 | +#endif | |
7149 | + Fh_igen, | |
7150 | + Fh_h_type, | |
7151 | + Fh_tail, | |
7152 | + | |
7153 | + Fh_ino = Fh_ino1, | |
7154 | + Fh_dir_ino = Fh_dir_ino1 | |
7155 | +}; | |
7156 | + | |
7157 | +static int au_test_anon(struct dentry *dentry) | |
7158 | +{ | |
7159 | + return !!(dentry->d_flags & DCACHE_DISCONNECTED); | |
7160 | +} | |
7161 | + | |
7162 | +/* ---------------------------------------------------------------------- */ | |
7163 | +/* inode generation external table */ | |
7164 | + | |
b752ccd1 | 7165 | +void au_xigen_inc(struct inode *inode) |
4a4d8108 | 7166 | +{ |
4a4d8108 AM |
7167 | + loff_t pos; |
7168 | + ssize_t sz; | |
7169 | + __u32 igen; | |
7170 | + struct super_block *sb; | |
7171 | + struct au_sbinfo *sbinfo; | |
7172 | + | |
4a4d8108 | 7173 | + sb = inode->i_sb; |
b752ccd1 | 7174 | + AuDebugOn(!au_opt_test(au_mntflags(sb), XINO)); |
1facf9fc | 7175 | + |
b752ccd1 | 7176 | + sbinfo = au_sbi(sb); |
1facf9fc | 7177 | + pos = inode->i_ino; |
7178 | + pos *= sizeof(igen); | |
7179 | + igen = inode->i_generation + 1; | |
1facf9fc | 7180 | + sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xigen, &igen, |
7181 | + sizeof(igen), &pos); | |
7182 | + if (sz == sizeof(igen)) | |
b752ccd1 | 7183 | + return; /* success */ |
1facf9fc | 7184 | + |
b752ccd1 | 7185 | + if (unlikely(sz >= 0)) |
1facf9fc | 7186 | + AuIOErr("xigen error (%zd)\n", sz); |
1facf9fc | 7187 | +} |
7188 | + | |
7189 | +int au_xigen_new(struct inode *inode) | |
7190 | +{ | |
7191 | + int err; | |
7192 | + loff_t pos; | |
7193 | + ssize_t sz; | |
7194 | + struct super_block *sb; | |
7195 | + struct au_sbinfo *sbinfo; | |
7196 | + struct file *file; | |
7197 | + | |
7198 | + err = 0; | |
7199 | + /* todo: dirty, at mount time */ | |
7200 | + if (inode->i_ino == AUFS_ROOT_INO) | |
7201 | + goto out; | |
7202 | + sb = inode->i_sb; | |
dece6358 | 7203 | + SiMustAnyLock(sb); |
1facf9fc | 7204 | + if (unlikely(!au_opt_test(au_mntflags(sb), XINO))) |
7205 | + goto out; | |
7206 | + | |
7207 | + err = -EFBIG; | |
7208 | + pos = inode->i_ino; | |
7209 | + if (unlikely(au_loff_max / sizeof(inode->i_generation) - 1 < pos)) { | |
7210 | + AuIOErr1("too large i%lld\n", pos); | |
7211 | + goto out; | |
7212 | + } | |
7213 | + pos *= sizeof(inode->i_generation); | |
7214 | + | |
7215 | + err = 0; | |
7216 | + sbinfo = au_sbi(sb); | |
7217 | + file = sbinfo->si_xigen; | |
7218 | + BUG_ON(!file); | |
7219 | + | |
7220 | + if (i_size_read(file->f_dentry->d_inode) | |
7221 | + < pos + sizeof(inode->i_generation)) { | |
7222 | + inode->i_generation = atomic_inc_return(&sbinfo->si_xigen_next); | |
7223 | + sz = xino_fwrite(sbinfo->si_xwrite, file, &inode->i_generation, | |
7224 | + sizeof(inode->i_generation), &pos); | |
7225 | + } else | |
7226 | + sz = xino_fread(sbinfo->si_xread, file, &inode->i_generation, | |
7227 | + sizeof(inode->i_generation), &pos); | |
7228 | + if (sz == sizeof(inode->i_generation)) | |
7229 | + goto out; /* success */ | |
7230 | + | |
7231 | + err = sz; | |
7232 | + if (unlikely(sz >= 0)) { | |
7233 | + err = -EIO; | |
7234 | + AuIOErr("xigen error (%zd)\n", sz); | |
7235 | + } | |
7236 | + | |
4f0767ce | 7237 | +out: |
1facf9fc | 7238 | + return err; |
7239 | +} | |
7240 | + | |
7241 | +int au_xigen_set(struct super_block *sb, struct file *base) | |
7242 | +{ | |
7243 | + int err; | |
7244 | + struct au_sbinfo *sbinfo; | |
7245 | + struct file *file; | |
7246 | + | |
dece6358 AM |
7247 | + SiMustWriteLock(sb); |
7248 | + | |
1facf9fc | 7249 | + sbinfo = au_sbi(sb); |
7250 | + file = au_xino_create2(base, sbinfo->si_xigen); | |
7251 | + err = PTR_ERR(file); | |
7252 | + if (IS_ERR(file)) | |
7253 | + goto out; | |
7254 | + err = 0; | |
7255 | + if (sbinfo->si_xigen) | |
7256 | + fput(sbinfo->si_xigen); | |
7257 | + sbinfo->si_xigen = file; | |
7258 | + | |
4f0767ce | 7259 | +out: |
1facf9fc | 7260 | + return err; |
7261 | +} | |
7262 | + | |
7263 | +void au_xigen_clr(struct super_block *sb) | |
7264 | +{ | |
7265 | + struct au_sbinfo *sbinfo; | |
7266 | + | |
dece6358 AM |
7267 | + SiMustWriteLock(sb); |
7268 | + | |
1facf9fc | 7269 | + sbinfo = au_sbi(sb); |
7270 | + if (sbinfo->si_xigen) { | |
7271 | + fput(sbinfo->si_xigen); | |
7272 | + sbinfo->si_xigen = NULL; | |
7273 | + } | |
7274 | +} | |
7275 | + | |
7276 | +/* ---------------------------------------------------------------------- */ | |
7277 | + | |
7278 | +static struct dentry *decode_by_ino(struct super_block *sb, ino_t ino, | |
7279 | + ino_t dir_ino) | |
7280 | +{ | |
7281 | + struct dentry *dentry, *d; | |
7282 | + struct inode *inode; | |
7283 | + unsigned int sigen; | |
7284 | + | |
7285 | + dentry = NULL; | |
7286 | + inode = ilookup(sb, ino); | |
7287 | + if (!inode) | |
7288 | + goto out; | |
7289 | + | |
7290 | + dentry = ERR_PTR(-ESTALE); | |
7291 | + sigen = au_sigen(sb); | |
7292 | + if (unlikely(is_bad_inode(inode) | |
7293 | + || IS_DEADDIR(inode) | |
7294 | + || sigen != au_iigen(inode))) | |
7295 | + goto out_iput; | |
7296 | + | |
7297 | + dentry = NULL; | |
7298 | + if (!dir_ino || S_ISDIR(inode->i_mode)) | |
7299 | + dentry = d_find_alias(inode); | |
7300 | + else { | |
7301 | + spin_lock(&dcache_lock); | |
7302 | + list_for_each_entry(d, &inode->i_dentry, d_alias) | |
7303 | + if (!au_test_anon(d) | |
7304 | + && d->d_parent->d_inode->i_ino == dir_ino) { | |
7305 | + dentry = dget_locked(d); | |
7306 | + break; | |
7307 | + } | |
7308 | + spin_unlock(&dcache_lock); | |
7309 | + } | |
7310 | + if (unlikely(dentry && sigen != au_digen(dentry))) { | |
7311 | + dput(dentry); | |
7312 | + dentry = ERR_PTR(-ESTALE); | |
7313 | + } | |
7314 | + | |
4f0767ce | 7315 | +out_iput: |
1facf9fc | 7316 | + iput(inode); |
4f0767ce | 7317 | +out: |
1facf9fc | 7318 | + return dentry; |
7319 | +} | |
7320 | + | |
7321 | +/* ---------------------------------------------------------------------- */ | |
7322 | + | |
7323 | +/* todo: dirty? */ | |
7324 | +/* if exportfs_decode_fh() passed vfsmount*, we could be happy */ | |
4a4d8108 AM |
7325 | + |
7326 | +struct au_compare_mnt_args { | |
7327 | + /* input */ | |
7328 | + struct super_block *sb; | |
7329 | + | |
7330 | + /* output */ | |
7331 | + struct vfsmount *mnt; | |
7332 | +}; | |
7333 | + | |
7334 | +static int au_compare_mnt(struct vfsmount *mnt, void *arg) | |
7335 | +{ | |
7336 | + struct au_compare_mnt_args *a = arg; | |
7337 | + | |
7338 | + if (mnt->mnt_sb != a->sb) | |
7339 | + return 0; | |
7340 | + a->mnt = mntget(mnt); | |
7341 | + return 1; | |
7342 | +} | |
7343 | + | |
1facf9fc | 7344 | +static struct vfsmount *au_mnt_get(struct super_block *sb) |
7345 | +{ | |
4a4d8108 AM |
7346 | + int err; |
7347 | + struct au_compare_mnt_args args = { | |
7348 | + .sb = sb | |
7349 | + }; | |
1facf9fc | 7350 | + struct mnt_namespace *ns; |
1facf9fc | 7351 | + |
1facf9fc | 7352 | + /* no get/put ?? */ |
7353 | + AuDebugOn(!current->nsproxy); | |
7354 | + ns = current->nsproxy->mnt_ns; | |
7355 | + AuDebugOn(!ns); | |
4a4d8108 AM |
7356 | + err = iterate_mounts(au_compare_mnt, &args, ns->root); |
7357 | + AuDebugOn(!err); | |
7358 | + AuDebugOn(!args.mnt); | |
7359 | + return args.mnt; | |
1facf9fc | 7360 | +} |
7361 | + | |
7362 | +struct au_nfsd_si_lock { | |
4a4d8108 AM |
7363 | + unsigned int sigen; |
7364 | + aufs_bindex_t br_id; | |
1facf9fc | 7365 | + unsigned char force_lock; |
7366 | +}; | |
7367 | + | |
7368 | +static aufs_bindex_t si_nfsd_read_lock(struct super_block *sb, | |
7369 | + struct au_nfsd_si_lock *nsi_lock) | |
7370 | +{ | |
7371 | + aufs_bindex_t bindex; | |
7372 | + | |
7373 | + si_read_lock(sb, AuLock_FLUSH); | |
7374 | + | |
7375 | + /* branch id may be wrapped around */ | |
7376 | + bindex = au_br_index(sb, nsi_lock->br_id); | |
7377 | + if (bindex >= 0 && nsi_lock->sigen + AUFS_BRANCH_MAX > au_sigen(sb)) | |
7378 | + goto out; /* success */ | |
7379 | + | |
7380 | + if (!nsi_lock->force_lock) | |
7381 | + si_read_unlock(sb); | |
7382 | + bindex = -1; | |
7383 | + | |
4f0767ce | 7384 | +out: |
1facf9fc | 7385 | + return bindex; |
7386 | +} | |
7387 | + | |
7388 | +struct find_name_by_ino { | |
7389 | + int called, found; | |
7390 | + ino_t ino; | |
7391 | + char *name; | |
7392 | + int namelen; | |
7393 | +}; | |
7394 | + | |
7395 | +static int | |
7396 | +find_name_by_ino(void *arg, const char *name, int namelen, loff_t offset, | |
7397 | + u64 ino, unsigned int d_type) | |
7398 | +{ | |
7399 | + struct find_name_by_ino *a = arg; | |
7400 | + | |
7401 | + a->called++; | |
7402 | + if (a->ino != ino) | |
7403 | + return 0; | |
7404 | + | |
7405 | + memcpy(a->name, name, namelen); | |
7406 | + a->namelen = namelen; | |
7407 | + a->found = 1; | |
7408 | + return 1; | |
7409 | +} | |
7410 | + | |
7411 | +static struct dentry *au_lkup_by_ino(struct path *path, ino_t ino, | |
7412 | + struct au_nfsd_si_lock *nsi_lock) | |
7413 | +{ | |
7414 | + struct dentry *dentry, *parent; | |
7415 | + struct file *file; | |
7416 | + struct inode *dir; | |
7417 | + struct find_name_by_ino arg; | |
7418 | + int err; | |
7419 | + | |
7420 | + parent = path->dentry; | |
7421 | + if (nsi_lock) | |
7422 | + si_read_unlock(parent->d_sb); | |
4a4d8108 | 7423 | + file = vfsub_dentry_open(path, au_dir_roflags); |
1facf9fc | 7424 | + dentry = (void *)file; |
7425 | + if (IS_ERR(file)) | |
7426 | + goto out; | |
7427 | + | |
7428 | + dentry = ERR_PTR(-ENOMEM); | |
4a4d8108 | 7429 | + arg.name = __getname_gfp(GFP_NOFS); |
1facf9fc | 7430 | + if (unlikely(!arg.name)) |
7431 | + goto out_file; | |
7432 | + arg.ino = ino; | |
7433 | + arg.found = 0; | |
7434 | + do { | |
7435 | + arg.called = 0; | |
7436 | + /* smp_mb(); */ | |
7437 | + err = vfsub_readdir(file, find_name_by_ino, &arg); | |
7438 | + } while (!err && !arg.found && arg.called); | |
7439 | + dentry = ERR_PTR(err); | |
7440 | + if (unlikely(err)) | |
7441 | + goto out_name; | |
7442 | + dentry = ERR_PTR(-ENOENT); | |
7443 | + if (!arg.found) | |
7444 | + goto out_name; | |
7445 | + | |
7446 | + /* do not call au_lkup_one() */ | |
7447 | + dir = parent->d_inode; | |
7448 | + mutex_lock(&dir->i_mutex); | |
7449 | + dentry = vfsub_lookup_one_len(arg.name, parent, arg.namelen); | |
7450 | + mutex_unlock(&dir->i_mutex); | |
7451 | + AuTraceErrPtr(dentry); | |
7452 | + if (IS_ERR(dentry)) | |
7453 | + goto out_name; | |
7454 | + AuDebugOn(au_test_anon(dentry)); | |
7455 | + if (unlikely(!dentry->d_inode)) { | |
7456 | + dput(dentry); | |
7457 | + dentry = ERR_PTR(-ENOENT); | |
7458 | + } | |
7459 | + | |
4f0767ce | 7460 | +out_name: |
1facf9fc | 7461 | + __putname(arg.name); |
4f0767ce | 7462 | +out_file: |
1facf9fc | 7463 | + fput(file); |
4f0767ce | 7464 | +out: |
1facf9fc | 7465 | + if (unlikely(nsi_lock |
7466 | + && si_nfsd_read_lock(parent->d_sb, nsi_lock) < 0)) | |
7467 | + if (!IS_ERR(dentry)) { | |
7468 | + dput(dentry); | |
7469 | + dentry = ERR_PTR(-ESTALE); | |
7470 | + } | |
7471 | + AuTraceErrPtr(dentry); | |
7472 | + return dentry; | |
7473 | +} | |
7474 | + | |
7475 | +static struct dentry *decode_by_dir_ino(struct super_block *sb, ino_t ino, | |
7476 | + ino_t dir_ino, | |
7477 | + struct au_nfsd_si_lock *nsi_lock) | |
7478 | +{ | |
7479 | + struct dentry *dentry; | |
7480 | + struct path path; | |
7481 | + | |
7482 | + if (dir_ino != AUFS_ROOT_INO) { | |
7483 | + path.dentry = decode_by_ino(sb, dir_ino, 0); | |
7484 | + dentry = path.dentry; | |
7485 | + if (!path.dentry || IS_ERR(path.dentry)) | |
7486 | + goto out; | |
7487 | + AuDebugOn(au_test_anon(path.dentry)); | |
7488 | + } else | |
7489 | + path.dentry = dget(sb->s_root); | |
7490 | + | |
7491 | + path.mnt = au_mnt_get(sb); | |
7492 | + dentry = au_lkup_by_ino(&path, ino, nsi_lock); | |
7493 | + path_put(&path); | |
7494 | + | |
4f0767ce | 7495 | +out: |
1facf9fc | 7496 | + AuTraceErrPtr(dentry); |
7497 | + return dentry; | |
7498 | +} | |
7499 | + | |
7500 | +/* ---------------------------------------------------------------------- */ | |
7501 | + | |
7502 | +static int h_acceptable(void *expv, struct dentry *dentry) | |
7503 | +{ | |
7504 | + return 1; | |
7505 | +} | |
7506 | + | |
7507 | +static char *au_build_path(struct dentry *h_parent, struct path *h_rootpath, | |
7508 | + char *buf, int len, struct super_block *sb) | |
7509 | +{ | |
7510 | + char *p; | |
7511 | + int n; | |
7512 | + struct path path; | |
7513 | + | |
7514 | + p = d_path(h_rootpath, buf, len); | |
7515 | + if (IS_ERR(p)) | |
7516 | + goto out; | |
7517 | + n = strlen(p); | |
7518 | + | |
7519 | + path.mnt = h_rootpath->mnt; | |
7520 | + path.dentry = h_parent; | |
7521 | + p = d_path(&path, buf, len); | |
7522 | + if (IS_ERR(p)) | |
7523 | + goto out; | |
7524 | + if (n != 1) | |
7525 | + p += n; | |
7526 | + | |
7527 | + path.mnt = au_mnt_get(sb); | |
7528 | + path.dentry = sb->s_root; | |
7529 | + p = d_path(&path, buf, len - strlen(p)); | |
7530 | + mntput(path.mnt); | |
7531 | + if (IS_ERR(p)) | |
7532 | + goto out; | |
7533 | + if (n != 1) | |
7534 | + p[strlen(p)] = '/'; | |
7535 | + | |
4f0767ce | 7536 | +out: |
1facf9fc | 7537 | + AuTraceErrPtr(p); |
7538 | + return p; | |
7539 | +} | |
7540 | + | |
7541 | +static | |
7542 | +struct dentry *decode_by_path(struct super_block *sb, aufs_bindex_t bindex, | |
7543 | + ino_t ino, __u32 *fh, int fh_len, | |
7544 | + struct au_nfsd_si_lock *nsi_lock) | |
7545 | +{ | |
7546 | + struct dentry *dentry, *h_parent, *root; | |
7547 | + struct super_block *h_sb; | |
7548 | + char *pathname, *p; | |
7549 | + struct vfsmount *h_mnt; | |
7550 | + struct au_branch *br; | |
7551 | + int err; | |
7552 | + struct path path; | |
7553 | + | |
7554 | + br = au_sbr(sb, bindex); | |
7555 | + /* au_br_get(br); */ | |
7556 | + h_mnt = br->br_mnt; | |
7557 | + h_sb = h_mnt->mnt_sb; | |
7558 | + /* todo: call lower fh_to_dentry()? fh_to_parent()? */ | |
7559 | + h_parent = exportfs_decode_fh(h_mnt, (void *)(fh + Fh_tail), | |
7560 | + fh_len - Fh_tail, fh[Fh_h_type], | |
7561 | + h_acceptable, /*context*/NULL); | |
7562 | + dentry = h_parent; | |
7563 | + if (unlikely(!h_parent || IS_ERR(h_parent))) { | |
7564 | + AuWarn1("%s decode_fh failed, %ld\n", | |
7565 | + au_sbtype(h_sb), PTR_ERR(h_parent)); | |
7566 | + goto out; | |
7567 | + } | |
7568 | + dentry = NULL; | |
7569 | + if (unlikely(au_test_anon(h_parent))) { | |
7570 | + AuWarn1("%s decode_fh returned a disconnected dentry\n", | |
7571 | + au_sbtype(h_sb)); | |
7572 | + goto out_h_parent; | |
7573 | + } | |
7574 | + | |
7575 | + dentry = ERR_PTR(-ENOMEM); | |
7576 | + pathname = (void *)__get_free_page(GFP_NOFS); | |
7577 | + if (unlikely(!pathname)) | |
7578 | + goto out_h_parent; | |
7579 | + | |
7580 | + root = sb->s_root; | |
7581 | + path.mnt = h_mnt; | |
7582 | + di_read_lock_parent(root, !AuLock_IR); | |
7583 | + path.dentry = au_h_dptr(root, bindex); | |
7584 | + di_read_unlock(root, !AuLock_IR); | |
7585 | + p = au_build_path(h_parent, &path, pathname, PAGE_SIZE, sb); | |
7586 | + dentry = (void *)p; | |
7587 | + if (IS_ERR(p)) | |
7588 | + goto out_pathname; | |
7589 | + | |
7590 | + si_read_unlock(sb); | |
7591 | + err = vfsub_kern_path(p, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path); | |
7592 | + dentry = ERR_PTR(err); | |
7593 | + if (unlikely(err)) | |
7594 | + goto out_relock; | |
7595 | + | |
7596 | + dentry = ERR_PTR(-ENOENT); | |
7597 | + AuDebugOn(au_test_anon(path.dentry)); | |
7598 | + if (unlikely(!path.dentry->d_inode)) | |
7599 | + goto out_path; | |
7600 | + | |
7601 | + if (ino != path.dentry->d_inode->i_ino) | |
7602 | + dentry = au_lkup_by_ino(&path, ino, /*nsi_lock*/NULL); | |
7603 | + else | |
7604 | + dentry = dget(path.dentry); | |
7605 | + | |
4f0767ce | 7606 | +out_path: |
1facf9fc | 7607 | + path_put(&path); |
4f0767ce | 7608 | +out_relock: |
1facf9fc | 7609 | + if (unlikely(si_nfsd_read_lock(sb, nsi_lock) < 0)) |
7610 | + if (!IS_ERR(dentry)) { | |
7611 | + dput(dentry); | |
7612 | + dentry = ERR_PTR(-ESTALE); | |
7613 | + } | |
4f0767ce | 7614 | +out_pathname: |
1facf9fc | 7615 | + free_page((unsigned long)pathname); |
4f0767ce | 7616 | +out_h_parent: |
1facf9fc | 7617 | + dput(h_parent); |
4f0767ce | 7618 | +out: |
1facf9fc | 7619 | + /* au_br_put(br); */ |
7620 | + AuTraceErrPtr(dentry); | |
7621 | + return dentry; | |
7622 | +} | |
7623 | + | |
7624 | +/* ---------------------------------------------------------------------- */ | |
7625 | + | |
7626 | +static struct dentry * | |
7627 | +aufs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, | |
7628 | + int fh_type) | |
7629 | +{ | |
7630 | + struct dentry *dentry; | |
7631 | + __u32 *fh = fid->raw; | |
7632 | + ino_t ino, dir_ino; | |
7633 | + aufs_bindex_t bindex; | |
7634 | + struct au_nfsd_si_lock nsi_lock = { | |
1facf9fc | 7635 | + .force_lock = 0 |
7636 | + }; | |
7637 | + | |
1facf9fc | 7638 | + dentry = ERR_PTR(-ESTALE); |
4a4d8108 AM |
7639 | + /* it should never happen, but the file handle is unreliable */ |
7640 | + if (unlikely(fh_len < Fh_tail)) | |
7641 | + goto out; | |
7642 | + nsi_lock.sigen = fh[Fh_sigen]; | |
7643 | + nsi_lock.br_id = fh[Fh_br_id]; | |
7644 | + | |
1facf9fc | 7645 | + /* branch id may be wrapped around */ |
7646 | + bindex = si_nfsd_read_lock(sb, &nsi_lock); | |
7647 | + if (unlikely(bindex < 0)) | |
7648 | + goto out; | |
7649 | + nsi_lock.force_lock = 1; | |
7650 | + | |
7651 | + /* is this inode still cached? */ | |
7652 | + ino = decode_ino(fh + Fh_ino); | |
4a4d8108 AM |
7653 | + /* it should never happen */ |
7654 | + if (unlikely(ino == AUFS_ROOT_INO)) | |
7655 | + goto out; | |
7656 | + | |
1facf9fc | 7657 | + dir_ino = decode_ino(fh + Fh_dir_ino); |
7658 | + dentry = decode_by_ino(sb, ino, dir_ino); | |
7659 | + if (IS_ERR(dentry)) | |
7660 | + goto out_unlock; | |
7661 | + if (dentry) | |
7662 | + goto accept; | |
7663 | + | |
7664 | + /* is the parent dir cached? */ | |
7665 | + dentry = decode_by_dir_ino(sb, ino, dir_ino, &nsi_lock); | |
7666 | + if (IS_ERR(dentry)) | |
7667 | + goto out_unlock; | |
7668 | + if (dentry) | |
7669 | + goto accept; | |
7670 | + | |
7671 | + /* lookup path */ | |
7672 | + dentry = decode_by_path(sb, bindex, ino, fh, fh_len, &nsi_lock); | |
7673 | + if (IS_ERR(dentry)) | |
7674 | + goto out_unlock; | |
7675 | + if (unlikely(!dentry)) | |
7676 | + /* todo?: make it ESTALE */ | |
7677 | + goto out_unlock; | |
7678 | + | |
4f0767ce | 7679 | +accept: |
1facf9fc | 7680 | + if (dentry->d_inode->i_generation == fh[Fh_igen]) |
7681 | + goto out_unlock; /* success */ | |
7682 | + | |
7683 | + dput(dentry); | |
7684 | + dentry = ERR_PTR(-ESTALE); | |
4f0767ce | 7685 | +out_unlock: |
1facf9fc | 7686 | + si_read_unlock(sb); |
4f0767ce | 7687 | +out: |
1facf9fc | 7688 | + AuTraceErrPtr(dentry); |
7689 | + return dentry; | |
7690 | +} | |
7691 | + | |
7692 | +#if 0 /* reserved for future use */ | |
7693 | +/* support subtreecheck option */ | |
7694 | +static struct dentry *aufs_fh_to_parent(struct super_block *sb, struct fid *fid, | |
7695 | + int fh_len, int fh_type) | |
7696 | +{ | |
7697 | + struct dentry *parent; | |
7698 | + __u32 *fh = fid->raw; | |
7699 | + ino_t dir_ino; | |
7700 | + | |
7701 | + dir_ino = decode_ino(fh + Fh_dir_ino); | |
7702 | + parent = decode_by_ino(sb, dir_ino, 0); | |
7703 | + if (IS_ERR(parent)) | |
7704 | + goto out; | |
7705 | + if (!parent) | |
7706 | + parent = decode_by_path(sb, au_br_index(sb, fh[Fh_br_id]), | |
7707 | + dir_ino, fh, fh_len); | |
7708 | + | |
4f0767ce | 7709 | +out: |
1facf9fc | 7710 | + AuTraceErrPtr(parent); |
7711 | + return parent; | |
7712 | +} | |
7713 | +#endif | |
7714 | + | |
7715 | +/* ---------------------------------------------------------------------- */ | |
7716 | + | |
7717 | +static int aufs_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len, | |
7718 | + int connectable) | |
7719 | +{ | |
7720 | + int err; | |
7721 | + aufs_bindex_t bindex, bend; | |
7722 | + struct super_block *sb, *h_sb; | |
7723 | + struct inode *inode; | |
7724 | + struct dentry *parent, *h_parent; | |
7725 | + struct au_branch *br; | |
7726 | + | |
7727 | + AuDebugOn(au_test_anon(dentry)); | |
7728 | + | |
7729 | + parent = NULL; | |
7730 | + err = -ENOSPC; | |
7731 | + if (unlikely(*max_len <= Fh_tail)) { | |
7732 | + AuWarn1("NFSv2 client (max_len %d)?\n", *max_len); | |
7733 | + goto out; | |
7734 | + } | |
7735 | + | |
7736 | + err = FILEID_ROOT; | |
7737 | + if (IS_ROOT(dentry)) { | |
7738 | + AuDebugOn(dentry->d_inode->i_ino != AUFS_ROOT_INO); | |
7739 | + goto out; | |
7740 | + } | |
7741 | + | |
7742 | + err = -EIO; | |
7743 | + h_parent = NULL; | |
7744 | + sb = dentry->d_sb; | |
7745 | + aufs_read_lock(dentry, AuLock_FLUSH | AuLock_IR); | |
7746 | + parent = dget_parent(dentry); | |
7747 | + di_read_lock_parent(parent, !AuLock_IR); | |
7748 | + inode = dentry->d_inode; | |
7749 | + AuDebugOn(!inode); | |
7750 | +#ifdef CONFIG_AUFS_DEBUG | |
7751 | + if (unlikely(!au_opt_test(au_mntflags(sb), XINO))) | |
7752 | + AuWarn1("NFS-exporting requires xino\n"); | |
7753 | +#endif | |
7754 | + | |
7755 | + bend = au_dbtaildir(parent); | |
7756 | + for (bindex = au_dbstart(parent); bindex <= bend; bindex++) { | |
7757 | + h_parent = au_h_dptr(parent, bindex); | |
7758 | + if (h_parent) { | |
7759 | + dget(h_parent); | |
7760 | + break; | |
7761 | + } | |
7762 | + } | |
7763 | + if (unlikely(!h_parent)) | |
7764 | + goto out_unlock; | |
7765 | + | |
7766 | + err = -EPERM; | |
7767 | + br = au_sbr(sb, bindex); | |
7768 | + h_sb = br->br_mnt->mnt_sb; | |
7769 | + if (unlikely(!h_sb->s_export_op)) { | |
7770 | + AuErr1("%s branch is not exportable\n", au_sbtype(h_sb)); | |
7771 | + goto out_dput; | |
7772 | + } | |
7773 | + | |
7774 | + fh[Fh_br_id] = br->br_id; | |
7775 | + fh[Fh_sigen] = au_sigen(sb); | |
7776 | + encode_ino(fh + Fh_ino, inode->i_ino); | |
7777 | + encode_ino(fh + Fh_dir_ino, parent->d_inode->i_ino); | |
7778 | + fh[Fh_igen] = inode->i_generation; | |
7779 | + | |
7780 | + *max_len -= Fh_tail; | |
7781 | + fh[Fh_h_type] = exportfs_encode_fh(h_parent, (void *)(fh + Fh_tail), | |
7782 | + max_len, | |
7783 | + /*connectable or subtreecheck*/0); | |
7784 | + err = fh[Fh_h_type]; | |
7785 | + *max_len += Fh_tail; | |
7786 | + /* todo: macros? */ | |
7787 | + if (err != 255) | |
7788 | + err = 99; | |
7789 | + else | |
7790 | + AuWarn1("%s encode_fh failed\n", au_sbtype(h_sb)); | |
7791 | + | |
4f0767ce | 7792 | +out_dput: |
1facf9fc | 7793 | + dput(h_parent); |
4f0767ce | 7794 | +out_unlock: |
1facf9fc | 7795 | + di_read_unlock(parent, !AuLock_IR); |
7796 | + dput(parent); | |
7797 | + aufs_read_unlock(dentry, AuLock_IR); | |
4f0767ce | 7798 | +out: |
1facf9fc | 7799 | + if (unlikely(err < 0)) |
7800 | + err = 255; | |
7801 | + return err; | |
7802 | +} | |
7803 | + | |
7804 | +/* ---------------------------------------------------------------------- */ | |
7805 | + | |
4a4d8108 AM |
7806 | +static int aufs_commit_metadata(struct inode *inode) |
7807 | +{ | |
7808 | + int err; | |
7809 | + aufs_bindex_t bindex; | |
7810 | + struct super_block *sb; | |
7811 | + struct inode *h_inode; | |
7812 | + int (*f)(struct inode *inode); | |
7813 | + | |
7814 | + sb = inode->i_sb; | |
953406b4 | 7815 | + si_read_lock(sb, AuLock_FLUSH); |
4a4d8108 AM |
7816 | + ii_write_lock_child(inode); |
7817 | + bindex = au_ibstart(inode); | |
7818 | + AuDebugOn(bindex < 0); | |
7819 | + h_inode = au_h_iptr(inode, bindex); | |
7820 | + | |
7821 | + f = h_inode->i_sb->s_export_op->commit_metadata; | |
7822 | + if (f) | |
7823 | + err = f(h_inode); | |
7824 | + else { | |
7825 | + struct writeback_control wbc = { | |
7826 | + .sync_mode = WB_SYNC_ALL, | |
7827 | + .nr_to_write = 0 /* metadata only */ | |
7828 | + }; | |
7829 | + | |
7830 | + err = sync_inode(h_inode, &wbc); | |
7831 | + } | |
7832 | + | |
7833 | + au_cpup_attr_timesizes(inode); | |
7834 | + ii_write_unlock(inode); | |
7835 | + si_read_unlock(sb); | |
7836 | + return err; | |
7837 | +} | |
7838 | + | |
7839 | +/* ---------------------------------------------------------------------- */ | |
7840 | + | |
1facf9fc | 7841 | +static struct export_operations aufs_export_op = { |
4a4d8108 | 7842 | + .fh_to_dentry = aufs_fh_to_dentry, |
1facf9fc | 7843 | + /* .fh_to_parent = aufs_fh_to_parent, */ |
4a4d8108 AM |
7844 | + .encode_fh = aufs_encode_fh, |
7845 | + .commit_metadata = aufs_commit_metadata | |
1facf9fc | 7846 | +}; |
7847 | + | |
7848 | +void au_export_init(struct super_block *sb) | |
7849 | +{ | |
7850 | + struct au_sbinfo *sbinfo; | |
7851 | + __u32 u; | |
7852 | + | |
7853 | + sb->s_export_op = &aufs_export_op; | |
7854 | + sbinfo = au_sbi(sb); | |
7855 | + sbinfo->si_xigen = NULL; | |
7856 | + get_random_bytes(&u, sizeof(u)); | |
7857 | + BUILD_BUG_ON(sizeof(u) != sizeof(int)); | |
7858 | + atomic_set(&sbinfo->si_xigen_next, u); | |
7859 | +} | |
b752ccd1 AM |
7860 | diff -urN /usr/share/empty/fs/aufs/file.c linux/fs/aufs/file.c |
7861 | --- /usr/share/empty/fs/aufs/file.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 7862 | +++ linux/fs/aufs/file.c 2010-10-21 09:52:43.090291764 +0200 |
4a4d8108 | 7863 | @@ -0,0 +1,652 @@ |
1facf9fc | 7864 | +/* |
4a4d8108 | 7865 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 7866 | + * |
7867 | + * This program, aufs is free software; you can redistribute it and/or modify | |
7868 | + * it under the terms of the GNU General Public License as published by | |
7869 | + * the Free Software Foundation; either version 2 of the License, or | |
7870 | + * (at your option) any later version. | |
dece6358 AM |
7871 | + * |
7872 | + * This program is distributed in the hope that it will be useful, | |
7873 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7874 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
7875 | + * GNU General Public License for more details. | |
7876 | + * | |
7877 | + * You should have received a copy of the GNU General Public License | |
7878 | + * along with this program; if not, write to the Free Software | |
7879 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 7880 | + */ |
7881 | + | |
7882 | +/* | |
4a4d8108 | 7883 | + * handling file/dir, and address_space operation |
1facf9fc | 7884 | + */ |
7885 | + | |
dece6358 | 7886 | +#include <linux/file.h> |
4a4d8108 AM |
7887 | +#include <linux/fsnotify.h> |
7888 | +#include <linux/namei.h> | |
7889 | +#include <linux/pagemap.h> | |
1facf9fc | 7890 | +#include "aufs.h" |
7891 | + | |
4a4d8108 AM |
7892 | +/* drop flags for writing */ |
7893 | +unsigned int au_file_roflags(unsigned int flags) | |
7894 | +{ | |
7895 | + flags &= ~(O_WRONLY | O_RDWR | O_APPEND | O_CREAT | O_TRUNC); | |
7896 | + flags |= O_RDONLY | O_NOATIME; | |
7897 | + return flags; | |
7898 | +} | |
7899 | + | |
7900 | +/* common functions to regular file and dir */ | |
7901 | +struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags, | |
7902 | + struct file *file) | |
1facf9fc | 7903 | +{ |
1308ab2a | 7904 | + struct file *h_file; |
4a4d8108 AM |
7905 | + struct dentry *h_dentry; |
7906 | + struct inode *h_inode; | |
7907 | + struct super_block *sb; | |
7908 | + struct au_branch *br; | |
7909 | + struct path h_path; | |
7910 | + int err, exec_flag; | |
1facf9fc | 7911 | + |
4a4d8108 AM |
7912 | + /* a race condition can happen between open and unlink/rmdir */ |
7913 | + h_file = ERR_PTR(-ENOENT); | |
7914 | + h_dentry = au_h_dptr(dentry, bindex); | |
b752ccd1 | 7915 | + if (au_test_nfsd() && !h_dentry) |
4a4d8108 AM |
7916 | + goto out; |
7917 | + h_inode = h_dentry->d_inode; | |
b752ccd1 | 7918 | + if (au_test_nfsd() && !h_inode) |
4a4d8108 AM |
7919 | + goto out; |
7920 | + if (unlikely((!d_unhashed(dentry) && d_unhashed(h_dentry)) | |
7921 | + || !h_inode)) | |
7922 | + goto out; | |
1facf9fc | 7923 | + |
4a4d8108 AM |
7924 | + sb = dentry->d_sb; |
7925 | + br = au_sbr(sb, bindex); | |
7926 | + h_file = ERR_PTR(-EACCES); | |
7927 | + exec_flag = flags & vfsub_fmode_to_uint(FMODE_EXEC); | |
7928 | + if (exec_flag && (br->br_mnt->mnt_flags & MNT_NOEXEC)) | |
7929 | + goto out; | |
1facf9fc | 7930 | + |
4a4d8108 AM |
7931 | + /* drop flags for writing */ |
7932 | + if (au_test_ro(sb, bindex, dentry->d_inode)) | |
7933 | + flags = au_file_roflags(flags); | |
7934 | + flags &= ~O_CREAT; | |
7935 | + atomic_inc(&br->br_count); | |
7936 | + h_path.dentry = h_dentry; | |
7937 | + h_path.mnt = br->br_mnt; | |
7938 | + if (!au_special_file(h_inode->i_mode)) | |
7939 | + h_file = vfsub_dentry_open(&h_path, flags); | |
7940 | + else { | |
7941 | + /* this block depends upon the configuration */ | |
7942 | + di_read_unlock(dentry, AuLock_IR); | |
7943 | + fi_write_unlock(file); | |
7944 | + si_read_unlock(sb); | |
7945 | + h_file = vfsub_dentry_open(&h_path, flags); | |
7946 | + si_noflush_read_lock(sb); | |
7947 | + fi_write_lock(file); | |
7948 | + di_read_lock_child(dentry, AuLock_IR); | |
dece6358 | 7949 | + } |
4a4d8108 AM |
7950 | + if (IS_ERR(h_file)) |
7951 | + goto out_br; | |
dece6358 | 7952 | + |
4a4d8108 AM |
7953 | + if (exec_flag) { |
7954 | + err = deny_write_access(h_file); | |
7955 | + if (unlikely(err)) { | |
7956 | + fput(h_file); | |
7957 | + h_file = ERR_PTR(err); | |
7958 | + goto out_br; | |
7959 | + } | |
7960 | + } | |
953406b4 | 7961 | + fsnotify_open(h_file); |
4a4d8108 | 7962 | + goto out; /* success */ |
1facf9fc | 7963 | + |
4f0767ce | 7964 | +out_br: |
4a4d8108 | 7965 | + atomic_dec(&br->br_count); |
4f0767ce | 7966 | +out: |
4a4d8108 AM |
7967 | + return h_file; |
7968 | +} | |
1308ab2a | 7969 | + |
4a4d8108 AM |
7970 | +int au_do_open(struct file *file, int (*open)(struct file *file, int flags), |
7971 | + struct au_fidir *fidir) | |
1facf9fc | 7972 | +{ |
dece6358 | 7973 | + int err; |
1facf9fc | 7974 | + struct dentry *dentry; |
1308ab2a | 7975 | + |
4a4d8108 AM |
7976 | + err = au_finfo_init(file, fidir); |
7977 | + if (unlikely(err)) | |
7978 | + goto out; | |
1facf9fc | 7979 | + |
7980 | + dentry = file->f_dentry; | |
4a4d8108 AM |
7981 | + di_read_lock_child(dentry, AuLock_IR); |
7982 | + err = open(file, vfsub_file_flags(file)); | |
7983 | + di_read_unlock(dentry, AuLock_IR); | |
1facf9fc | 7984 | + |
4a4d8108 AM |
7985 | + fi_write_unlock(file); |
7986 | + if (unlikely(err)) { | |
7987 | + au_fi(file)->fi_hdir = NULL; | |
7988 | + au_finfo_fin(file); | |
1308ab2a | 7989 | + } |
4a4d8108 | 7990 | + |
4f0767ce | 7991 | +out: |
1308ab2a | 7992 | + return err; |
7993 | +} | |
dece6358 | 7994 | + |
4a4d8108 | 7995 | +int au_reopen_nondir(struct file *file) |
1308ab2a | 7996 | +{ |
4a4d8108 AM |
7997 | + int err; |
7998 | + aufs_bindex_t bstart; | |
7999 | + struct dentry *dentry; | |
8000 | + struct file *h_file, *h_file_tmp; | |
1308ab2a | 8001 | + |
4a4d8108 AM |
8002 | + dentry = file->f_dentry; |
8003 | + AuDebugOn(au_special_file(dentry->d_inode->i_mode)); | |
8004 | + bstart = au_dbstart(dentry); | |
8005 | + h_file_tmp = NULL; | |
8006 | + if (au_fbstart(file) == bstart) { | |
8007 | + h_file = au_hf_top(file); | |
8008 | + if (file->f_mode == h_file->f_mode) | |
8009 | + return 0; /* success */ | |
8010 | + h_file_tmp = h_file; | |
8011 | + get_file(h_file_tmp); | |
8012 | + au_set_h_fptr(file, bstart, NULL); | |
8013 | + } | |
8014 | + AuDebugOn(au_fi(file)->fi_hdir); | |
8015 | + AuDebugOn(au_fbstart(file) < bstart); | |
1308ab2a | 8016 | + |
4a4d8108 AM |
8017 | + h_file = au_h_open(dentry, bstart, vfsub_file_flags(file) & ~O_TRUNC, |
8018 | + file); | |
8019 | + err = PTR_ERR(h_file); | |
8020 | + if (IS_ERR(h_file)) | |
8021 | + goto out; /* todo: close all? */ | |
8022 | + | |
8023 | + err = 0; | |
8024 | + au_set_fbstart(file, bstart); | |
8025 | + au_set_h_fptr(file, bstart, h_file); | |
8026 | + au_update_figen(file); | |
8027 | + /* todo: necessary? */ | |
8028 | + /* file->f_ra = h_file->f_ra; */ | |
8029 | + | |
4f0767ce | 8030 | +out: |
4a4d8108 AM |
8031 | + if (h_file_tmp) |
8032 | + fput(h_file_tmp); | |
8033 | + return err; | |
1facf9fc | 8034 | +} |
8035 | + | |
1308ab2a | 8036 | +/* ---------------------------------------------------------------------- */ |
8037 | + | |
4a4d8108 AM |
8038 | +static int au_reopen_wh(struct file *file, aufs_bindex_t btgt, |
8039 | + struct dentry *hi_wh) | |
1facf9fc | 8040 | +{ |
4a4d8108 AM |
8041 | + int err; |
8042 | + aufs_bindex_t bstart; | |
8043 | + struct au_dinfo *dinfo; | |
8044 | + struct dentry *h_dentry; | |
8045 | + struct au_hdentry *hdp; | |
1facf9fc | 8046 | + |
4a4d8108 AM |
8047 | + dinfo = au_di(file->f_dentry); |
8048 | + AuRwMustWriteLock(&dinfo->di_rwsem); | |
dece6358 | 8049 | + |
4a4d8108 AM |
8050 | + bstart = dinfo->di_bstart; |
8051 | + dinfo->di_bstart = btgt; | |
8052 | + hdp = dinfo->di_hdentry; | |
8053 | + h_dentry = hdp[0 + btgt].hd_dentry; | |
8054 | + hdp[0 + btgt].hd_dentry = hi_wh; | |
8055 | + err = au_reopen_nondir(file); | |
8056 | + hdp[0 + btgt].hd_dentry = h_dentry; | |
8057 | + dinfo->di_bstart = bstart; | |
1facf9fc | 8058 | + |
1facf9fc | 8059 | + return err; |
8060 | +} | |
8061 | + | |
4a4d8108 AM |
8062 | +static int au_ready_to_write_wh(struct file *file, loff_t len, |
8063 | + aufs_bindex_t bcpup) | |
1facf9fc | 8064 | +{ |
4a4d8108 | 8065 | + int err; |
dece6358 | 8066 | + struct inode *inode; |
4a4d8108 | 8067 | + struct dentry *dentry, *hi_wh; |
1facf9fc | 8068 | + |
dece6358 | 8069 | + dentry = file->f_dentry; |
4a4d8108 | 8070 | + au_update_dbstart(dentry); |
dece6358 | 8071 | + inode = dentry->d_inode; |
4a4d8108 AM |
8072 | + hi_wh = au_hi_wh(inode, bcpup); |
8073 | + if (!hi_wh) | |
8074 | + err = au_sio_cpup_wh(dentry, bcpup, len, file); | |
8075 | + else | |
8076 | + /* already copied-up after unlink */ | |
8077 | + err = au_reopen_wh(file, bcpup, hi_wh); | |
1facf9fc | 8078 | + |
4a4d8108 AM |
8079 | + if (!err |
8080 | + && inode->i_nlink > 1 | |
8081 | + && au_opt_test(au_mntflags(dentry->d_sb), PLINK)) | |
8082 | + au_plink_append(inode, bcpup, au_h_dptr(dentry, bcpup)); | |
1308ab2a | 8083 | + |
dece6358 | 8084 | + return err; |
1facf9fc | 8085 | +} |
8086 | + | |
4a4d8108 AM |
8087 | +/* |
8088 | + * prepare the @file for writing. | |
8089 | + */ | |
8090 | +int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin) | |
1facf9fc | 8091 | +{ |
4a4d8108 AM |
8092 | + int err; |
8093 | + aufs_bindex_t bstart, bcpup; | |
8094 | + struct dentry *dentry, *parent, *h_dentry; | |
8095 | + struct inode *h_inode, *inode; | |
1facf9fc | 8096 | + struct super_block *sb; |
4a4d8108 | 8097 | + struct file *h_file; |
1facf9fc | 8098 | + |
8099 | + dentry = file->f_dentry; | |
1facf9fc | 8100 | + sb = dentry->d_sb; |
4a4d8108 AM |
8101 | + inode = dentry->d_inode; |
8102 | + AuDebugOn(au_special_file(inode->i_mode)); | |
8103 | + bstart = au_fbstart(file); | |
8104 | + err = au_test_ro(sb, bstart, inode); | |
8105 | + if (!err && (au_hf_top(file)->f_mode & FMODE_WRITE)) { | |
8106 | + err = au_pin(pin, dentry, bstart, AuOpt_UDBA_NONE, /*flags*/0); | |
1facf9fc | 8107 | + goto out; |
4a4d8108 | 8108 | + } |
1facf9fc | 8109 | + |
4a4d8108 AM |
8110 | + /* need to cpup */ |
8111 | + parent = dget_parent(dentry); | |
8112 | + di_write_lock_parent(parent); | |
8113 | + err = AuWbrCopyup(au_sbi(sb), dentry); | |
8114 | + bcpup = err; | |
8115 | + if (unlikely(err < 0)) | |
8116 | + goto out_dgrade; | |
8117 | + err = 0; | |
8118 | + | |
8119 | + if (!au_h_dptr(parent, bcpup)) { | |
8120 | + err = au_cpup_dirs(dentry, bcpup); | |
1facf9fc | 8121 | + if (unlikely(err)) |
4a4d8108 AM |
8122 | + goto out_dgrade; |
8123 | + } | |
8124 | + | |
8125 | + err = au_pin(pin, dentry, bcpup, AuOpt_UDBA_NONE, | |
8126 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
8127 | + if (unlikely(err)) | |
8128 | + goto out_dgrade; | |
8129 | + | |
8130 | + h_dentry = au_hf_top(file)->f_dentry; | |
8131 | + h_inode = h_dentry->d_inode; | |
8132 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); | |
8133 | + h_file = au_h_open_pre(dentry, bstart); | |
8134 | + if (IS_ERR(h_file)) { | |
8135 | + err = PTR_ERR(h_file); | |
8136 | + h_file = NULL; | |
8137 | + } else if (d_unhashed(dentry) /* || d_unhashed(h_dentry) */ | |
8138 | + /* || !h_inode->i_nlink */) { | |
8139 | + err = au_ready_to_write_wh(file, len, bcpup); | |
8140 | + di_downgrade_lock(parent, AuLock_IR); | |
8141 | + } else { | |
8142 | + di_downgrade_lock(parent, AuLock_IR); | |
8143 | + if (!au_h_dptr(dentry, bcpup)) | |
8144 | + err = au_sio_cpup_simple(dentry, bcpup, len, | |
8145 | + AuCpup_DTIME); | |
8146 | + if (!err) | |
8147 | + err = au_reopen_nondir(file); | |
8148 | + } | |
8149 | + mutex_unlock(&h_inode->i_mutex); | |
8150 | + au_h_open_post(dentry, bstart, h_file); | |
8151 | + | |
8152 | + if (!err) { | |
8153 | + au_pin_set_parent_lflag(pin, /*lflag*/0); | |
8154 | + goto out_dput; /* success */ | |
8155 | + } | |
8156 | + au_unpin(pin); | |
8157 | + goto out_unlock; | |
1facf9fc | 8158 | + |
4f0767ce | 8159 | +out_dgrade: |
4a4d8108 | 8160 | + di_downgrade_lock(parent, AuLock_IR); |
4f0767ce | 8161 | +out_unlock: |
4a4d8108 | 8162 | + di_read_unlock(parent, AuLock_IR); |
4f0767ce | 8163 | +out_dput: |
4a4d8108 | 8164 | + dput(parent); |
4f0767ce | 8165 | +out: |
1facf9fc | 8166 | + return err; |
8167 | +} | |
8168 | + | |
4a4d8108 AM |
8169 | +/* ---------------------------------------------------------------------- */ |
8170 | + | |
8171 | +int au_do_flush(struct file *file, fl_owner_t id, | |
8172 | + int (*flush)(struct file *file, fl_owner_t id)) | |
1facf9fc | 8173 | +{ |
4a4d8108 | 8174 | + int err; |
1308ab2a | 8175 | + struct dentry *dentry; |
1facf9fc | 8176 | + struct super_block *sb; |
4a4d8108 | 8177 | + struct inode *inode; |
1facf9fc | 8178 | + |
1facf9fc | 8179 | + dentry = file->f_dentry; |
8180 | + sb = dentry->d_sb; | |
dece6358 | 8181 | + inode = dentry->d_inode; |
4a4d8108 AM |
8182 | + si_noflush_read_lock(sb); |
8183 | + fi_read_lock(file); | |
b752ccd1 | 8184 | + ii_read_lock_child(inode); |
1facf9fc | 8185 | + |
4a4d8108 AM |
8186 | + err = flush(file, id); |
8187 | + au_cpup_attr_timesizes(inode); | |
1facf9fc | 8188 | + |
b752ccd1 | 8189 | + ii_read_unlock(inode); |
4a4d8108 | 8190 | + fi_read_unlock(file); |
1308ab2a | 8191 | + si_read_unlock(sb); |
dece6358 | 8192 | + return err; |
1facf9fc | 8193 | +} |
8194 | + | |
4a4d8108 AM |
8195 | +/* ---------------------------------------------------------------------- */ |
8196 | + | |
8197 | +static int au_file_refresh_by_inode(struct file *file, int *need_reopen) | |
1facf9fc | 8198 | +{ |
4a4d8108 AM |
8199 | + int err; |
8200 | + aufs_bindex_t bstart; | |
8201 | + struct au_pin pin; | |
8202 | + struct au_finfo *finfo; | |
8203 | + struct dentry *dentry, *parent, *hi_wh; | |
8204 | + struct inode *inode; | |
1facf9fc | 8205 | + struct super_block *sb; |
8206 | + | |
4a4d8108 AM |
8207 | + FiMustWriteLock(file); |
8208 | + | |
8209 | + err = 0; | |
8210 | + finfo = au_fi(file); | |
1308ab2a | 8211 | + dentry = file->f_dentry; |
8212 | + sb = dentry->d_sb; | |
4a4d8108 AM |
8213 | + inode = dentry->d_inode; |
8214 | + bstart = au_ibstart(inode); | |
8215 | + if (bstart == finfo->fi_btop) | |
1308ab2a | 8216 | + goto out; |
dece6358 | 8217 | + |
4a4d8108 AM |
8218 | + parent = dget_parent(dentry); |
8219 | + if (au_test_ro(sb, bstart, inode)) { | |
8220 | + di_read_lock_parent(parent, !AuLock_IR); | |
8221 | + err = AuWbrCopyup(au_sbi(sb), dentry); | |
8222 | + bstart = err; | |
8223 | + di_read_unlock(parent, !AuLock_IR); | |
8224 | + if (unlikely(err < 0)) | |
8225 | + goto out_parent; | |
8226 | + err = 0; | |
1facf9fc | 8227 | + } |
1facf9fc | 8228 | + |
4a4d8108 AM |
8229 | + di_read_lock_parent(parent, AuLock_IR); |
8230 | + hi_wh = au_hi_wh(inode, bstart); | |
8231 | + if (au_opt_test(au_mntflags(sb), PLINK) | |
8232 | + && au_plink_test(inode) | |
8233 | + && !d_unhashed(dentry)) { | |
8234 | + err = au_test_and_cpup_dirs(dentry, bstart); | |
8235 | + if (unlikely(err)) | |
8236 | + goto out_unlock; | |
8237 | + | |
8238 | + /* always superio. */ | |
8239 | + err = au_pin(&pin, dentry, bstart, AuOpt_UDBA_NONE, | |
8240 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
8241 | + if (!err) | |
8242 | + err = au_sio_cpup_simple(dentry, bstart, -1, | |
8243 | + AuCpup_DTIME); | |
8244 | + au_unpin(&pin); | |
8245 | + } else if (hi_wh) { | |
8246 | + /* already copied-up after unlink */ | |
8247 | + err = au_reopen_wh(file, bstart, hi_wh); | |
8248 | + *need_reopen = 0; | |
8249 | + } | |
1facf9fc | 8250 | + |
4f0767ce | 8251 | +out_unlock: |
4a4d8108 | 8252 | + di_read_unlock(parent, AuLock_IR); |
4f0767ce | 8253 | +out_parent: |
4a4d8108 | 8254 | + dput(parent); |
4f0767ce | 8255 | +out: |
1308ab2a | 8256 | + return err; |
dece6358 | 8257 | +} |
1facf9fc | 8258 | + |
4a4d8108 | 8259 | +static void au_do_refresh_dir(struct file *file) |
dece6358 | 8260 | +{ |
4a4d8108 AM |
8261 | + aufs_bindex_t bindex, bend, new_bindex, brid; |
8262 | + struct au_hfile *p, tmp, *q; | |
8263 | + struct au_finfo *finfo; | |
1308ab2a | 8264 | + struct super_block *sb; |
4a4d8108 | 8265 | + struct au_fidir *fidir; |
1facf9fc | 8266 | + |
4a4d8108 | 8267 | + FiMustWriteLock(file); |
1facf9fc | 8268 | + |
4a4d8108 AM |
8269 | + sb = file->f_dentry->d_sb; |
8270 | + finfo = au_fi(file); | |
8271 | + fidir = finfo->fi_hdir; | |
8272 | + AuDebugOn(!fidir); | |
8273 | + p = fidir->fd_hfile + finfo->fi_btop; | |
8274 | + brid = p->hf_br->br_id; | |
8275 | + bend = fidir->fd_bbot; | |
8276 | + for (bindex = finfo->fi_btop; bindex <= bend; bindex++, p++) { | |
8277 | + if (!p->hf_file) | |
8278 | + continue; | |
1308ab2a | 8279 | + |
4a4d8108 AM |
8280 | + new_bindex = au_br_index(sb, p->hf_br->br_id); |
8281 | + if (new_bindex == bindex) | |
8282 | + continue; | |
8283 | + if (new_bindex < 0) { | |
8284 | + au_set_h_fptr(file, bindex, NULL); | |
8285 | + continue; | |
8286 | + } | |
1308ab2a | 8287 | + |
4a4d8108 AM |
8288 | + /* swap two lower inode, and loop again */ |
8289 | + q = fidir->fd_hfile + new_bindex; | |
8290 | + tmp = *q; | |
8291 | + *q = *p; | |
8292 | + *p = tmp; | |
8293 | + if (tmp.hf_file) { | |
8294 | + bindex--; | |
8295 | + p--; | |
8296 | + } | |
8297 | + } | |
1308ab2a | 8298 | + |
4a4d8108 AM |
8299 | + p = fidir->fd_hfile; |
8300 | + if (!au_test_mmapped(file) && !d_unhashed(file->f_dentry)) { | |
8301 | + bend = au_sbend(sb); | |
8302 | + for (finfo->fi_btop = 0; finfo->fi_btop <= bend; | |
8303 | + finfo->fi_btop++, p++) | |
8304 | + if (p->hf_file) { | |
8305 | + if (p->hf_file->f_dentry | |
8306 | + && p->hf_file->f_dentry->d_inode) | |
8307 | + break; | |
8308 | + else | |
8309 | + au_hfput(p, file); | |
8310 | + } | |
8311 | + } else { | |
8312 | + bend = au_br_index(sb, brid); | |
8313 | + for (finfo->fi_btop = 0; finfo->fi_btop < bend; | |
8314 | + finfo->fi_btop++, p++) | |
8315 | + if (p->hf_file) | |
8316 | + au_hfput(p, file); | |
8317 | + bend = au_sbend(sb); | |
8318 | + } | |
1308ab2a | 8319 | + |
4a4d8108 AM |
8320 | + p = fidir->fd_hfile + bend; |
8321 | + for (fidir->fd_bbot = bend; fidir->fd_bbot >= finfo->fi_btop; | |
8322 | + fidir->fd_bbot--, p--) | |
8323 | + if (p->hf_file) { | |
8324 | + if (p->hf_file->f_dentry | |
8325 | + && p->hf_file->f_dentry->d_inode) | |
8326 | + break; | |
8327 | + else | |
8328 | + au_hfput(p, file); | |
8329 | + } | |
8330 | + AuDebugOn(fidir->fd_bbot < finfo->fi_btop); | |
1308ab2a | 8331 | +} |
8332 | + | |
4a4d8108 AM |
8333 | +/* |
8334 | + * after branch manipulating, refresh the file. | |
8335 | + */ | |
8336 | +static int refresh_file(struct file *file, int (*reopen)(struct file *file)) | |
1facf9fc | 8337 | +{ |
4a4d8108 AM |
8338 | + int err, need_reopen; |
8339 | + aufs_bindex_t bend, bindex; | |
8340 | + struct dentry *dentry; | |
1308ab2a | 8341 | + struct au_finfo *finfo; |
4a4d8108 | 8342 | + struct au_hfile *hfile; |
1facf9fc | 8343 | + |
4a4d8108 | 8344 | + dentry = file->f_dentry; |
1308ab2a | 8345 | + finfo = au_fi(file); |
4a4d8108 AM |
8346 | + if (!finfo->fi_hdir) { |
8347 | + hfile = &finfo->fi_htop; | |
8348 | + AuDebugOn(!hfile->hf_file); | |
8349 | + bindex = au_br_index(dentry->d_sb, hfile->hf_br->br_id); | |
8350 | + AuDebugOn(bindex < 0); | |
8351 | + if (bindex != finfo->fi_btop) | |
8352 | + au_set_fbstart(file, bindex); | |
8353 | + } else { | |
8354 | + err = au_fidir_realloc(finfo, au_sbend(dentry->d_sb) + 1); | |
8355 | + if (unlikely(err)) | |
8356 | + goto out; | |
8357 | + au_do_refresh_dir(file); | |
8358 | + } | |
1facf9fc | 8359 | + |
4a4d8108 AM |
8360 | + err = 0; |
8361 | + need_reopen = 1; | |
8362 | + if (!au_test_mmapped(file)) | |
8363 | + err = au_file_refresh_by_inode(file, &need_reopen); | |
8364 | + if (!err && need_reopen && !d_unhashed(dentry)) | |
8365 | + err = reopen(file); | |
8366 | + if (!err) { | |
8367 | + au_update_figen(file); | |
8368 | + goto out; /* success */ | |
8369 | + } | |
8370 | + | |
8371 | + /* error, close all lower files */ | |
8372 | + if (finfo->fi_hdir) { | |
8373 | + bend = au_fbend_dir(file); | |
8374 | + for (bindex = au_fbstart(file); bindex <= bend; bindex++) | |
8375 | + au_set_h_fptr(file, bindex, NULL); | |
8376 | + } | |
1facf9fc | 8377 | + |
4f0767ce | 8378 | +out: |
1facf9fc | 8379 | + return err; |
8380 | +} | |
8381 | + | |
4a4d8108 AM |
8382 | +/* common function to regular file and dir */ |
8383 | +int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file), | |
8384 | + int wlock) | |
dece6358 | 8385 | +{ |
1308ab2a | 8386 | + int err; |
4a4d8108 AM |
8387 | + unsigned int sigen, figen; |
8388 | + aufs_bindex_t bstart; | |
8389 | + unsigned char pseudo_link; | |
8390 | + struct dentry *dentry; | |
8391 | + struct inode *inode; | |
1facf9fc | 8392 | + |
4a4d8108 AM |
8393 | + err = 0; |
8394 | + dentry = file->f_dentry; | |
8395 | + inode = dentry->d_inode; | |
8396 | + AuDebugOn(au_special_file(inode->i_mode)); | |
8397 | + sigen = au_sigen(dentry->d_sb); | |
8398 | + fi_write_lock(file); | |
8399 | + figen = au_figen(file); | |
8400 | + di_write_lock_child(dentry); | |
8401 | + bstart = au_dbstart(dentry); | |
8402 | + pseudo_link = (bstart != au_ibstart(inode)); | |
8403 | + if (sigen == figen && !pseudo_link && au_fbstart(file) == bstart) { | |
8404 | + if (!wlock) { | |
8405 | + di_downgrade_lock(dentry, AuLock_IR); | |
8406 | + fi_downgrade_lock(file); | |
8407 | + } | |
8408 | + goto out; /* success */ | |
8409 | + } | |
dece6358 | 8410 | + |
4a4d8108 AM |
8411 | + AuDbg("sigen %d, figen %d\n", sigen, figen); |
8412 | + if (sigen != au_digen(dentry) | |
8413 | + || sigen != au_iigen(inode)) { | |
8414 | + err = au_reval_dpath(dentry, sigen); | |
8415 | + if (unlikely(err < 0)) | |
8416 | + goto out; | |
8417 | + AuDebugOn(au_digen(dentry) != sigen | |
8418 | + || au_iigen(inode) != sigen); | |
8419 | + } | |
dece6358 | 8420 | + |
4a4d8108 AM |
8421 | + err = refresh_file(file, reopen); |
8422 | + if (!err) { | |
8423 | + if (!wlock) { | |
8424 | + di_downgrade_lock(dentry, AuLock_IR); | |
8425 | + fi_downgrade_lock(file); | |
8426 | + } | |
8427 | + } else { | |
8428 | + di_write_unlock(dentry); | |
8429 | + fi_write_unlock(file); | |
8430 | + } | |
1facf9fc | 8431 | + |
4f0767ce | 8432 | +out: |
1308ab2a | 8433 | + return err; |
8434 | +} | |
1facf9fc | 8435 | + |
4a4d8108 AM |
8436 | +/* ---------------------------------------------------------------------- */ |
8437 | + | |
8438 | +/* cf. aufs_nopage() */ | |
8439 | +/* for madvise(2) */ | |
8440 | +static int aufs_readpage(struct file *file __maybe_unused, struct page *page) | |
1308ab2a | 8441 | +{ |
4a4d8108 AM |
8442 | + unlock_page(page); |
8443 | + return 0; | |
8444 | +} | |
1facf9fc | 8445 | + |
4a4d8108 AM |
8446 | +/* it will never be called, but necessary to support O_DIRECT */ |
8447 | +static ssize_t aufs_direct_IO(int rw, struct kiocb *iocb, | |
8448 | + const struct iovec *iov, loff_t offset, | |
8449 | + unsigned long nr_segs) | |
8450 | +{ BUG(); return 0; } | |
1facf9fc | 8451 | + |
4a4d8108 AM |
8452 | +/* |
8453 | + * it will never be called, but madvise and fadvise behaves differently | |
8454 | + * when get_xip_mem is defined | |
8455 | + */ | |
8456 | +static int aufs_get_xip_mem(struct address_space *mapping, pgoff_t pgoff, | |
8457 | + int create, void **kmem, unsigned long *pfn) | |
8458 | +{ BUG(); return 0; } | |
1facf9fc | 8459 | + |
4a4d8108 AM |
8460 | +/* they will never be called. */ |
8461 | +#ifdef CONFIG_AUFS_DEBUG | |
8462 | +static int aufs_write_begin(struct file *file, struct address_space *mapping, | |
8463 | + loff_t pos, unsigned len, unsigned flags, | |
8464 | + struct page **pagep, void **fsdata) | |
8465 | +{ AuUnsupport(); return 0; } | |
8466 | +static int aufs_write_end(struct file *file, struct address_space *mapping, | |
8467 | + loff_t pos, unsigned len, unsigned copied, | |
8468 | + struct page *page, void *fsdata) | |
8469 | +{ AuUnsupport(); return 0; } | |
8470 | +static int aufs_writepage(struct page *page, struct writeback_control *wbc) | |
8471 | +{ AuUnsupport(); return 0; } | |
8472 | +static void aufs_sync_page(struct page *page) | |
8473 | +{ AuUnsupport(); } | |
1308ab2a | 8474 | + |
4a4d8108 AM |
8475 | +static int aufs_set_page_dirty(struct page *page) |
8476 | +{ AuUnsupport(); return 0; } | |
8477 | +static void aufs_invalidatepage(struct page *page, unsigned long offset) | |
8478 | +{ AuUnsupport(); } | |
8479 | +static int aufs_releasepage(struct page *page, gfp_t gfp) | |
8480 | +{ AuUnsupport(); return 0; } | |
8481 | +static int aufs_migratepage(struct address_space *mapping, struct page *newpage, | |
8482 | + struct page *page) | |
8483 | +{ AuUnsupport(); return 0; } | |
8484 | +static int aufs_launder_page(struct page *page) | |
8485 | +{ AuUnsupport(); return 0; } | |
8486 | +static int aufs_is_partially_uptodate(struct page *page, | |
8487 | + read_descriptor_t *desc, | |
8488 | + unsigned long from) | |
8489 | +{ AuUnsupport(); return 0; } | |
8490 | +static int aufs_error_remove_page(struct address_space *mapping, | |
8491 | + struct page *page) | |
8492 | +{ AuUnsupport(); return 0; } | |
8493 | +#endif /* CONFIG_AUFS_DEBUG */ | |
8494 | + | |
8495 | +const struct address_space_operations aufs_aop = { | |
8496 | + .readpage = aufs_readpage, | |
8497 | + .direct_IO = aufs_direct_IO, | |
8498 | + .get_xip_mem = aufs_get_xip_mem, | |
8499 | +#ifdef CONFIG_AUFS_DEBUG | |
8500 | + .writepage = aufs_writepage, | |
8501 | + .sync_page = aufs_sync_page, | |
8502 | + /* no writepages, because of writepage */ | |
8503 | + .set_page_dirty = aufs_set_page_dirty, | |
8504 | + /* no readpages, because of readpage */ | |
8505 | + .write_begin = aufs_write_begin, | |
8506 | + .write_end = aufs_write_end, | |
8507 | + /* no bmap, no block device */ | |
8508 | + .invalidatepage = aufs_invalidatepage, | |
8509 | + .releasepage = aufs_releasepage, | |
8510 | + .migratepage = aufs_migratepage, | |
8511 | + .launder_page = aufs_launder_page, | |
8512 | + .is_partially_uptodate = aufs_is_partially_uptodate, | |
8513 | + .error_remove_page = aufs_error_remove_page | |
8514 | +#endif /* CONFIG_AUFS_DEBUG */ | |
dece6358 | 8515 | +}; |
b752ccd1 AM |
8516 | diff -urN /usr/share/empty/fs/aufs/file.h linux/fs/aufs/file.h |
8517 | --- /usr/share/empty/fs/aufs/file.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 8518 | +++ linux/fs/aufs/file.h 2010-10-21 09:52:43.090291764 +0200 |
b752ccd1 | 8519 | @@ -0,0 +1,238 @@ |
4a4d8108 AM |
8520 | +/* |
8521 | + * Copyright (C) 2005-2010 Junjiro R. Okajima | |
8522 | + * | |
8523 | + * This program, aufs is free software; you can redistribute it and/or modify | |
8524 | + * it under the terms of the GNU General Public License as published by | |
8525 | + * the Free Software Foundation; either version 2 of the License, or | |
8526 | + * (at your option) any later version. | |
8527 | + * | |
8528 | + * This program is distributed in the hope that it will be useful, | |
8529 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8530 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
8531 | + * GNU General Public License for more details. | |
8532 | + * | |
8533 | + * You should have received a copy of the GNU General Public License | |
8534 | + * along with this program; if not, write to the Free Software | |
8535 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
8536 | + */ | |
1facf9fc | 8537 | + |
4a4d8108 AM |
8538 | +/* |
8539 | + * file operations | |
8540 | + */ | |
1facf9fc | 8541 | + |
4a4d8108 AM |
8542 | +#ifndef __AUFS_FILE_H__ |
8543 | +#define __AUFS_FILE_H__ | |
1facf9fc | 8544 | + |
4a4d8108 | 8545 | +#ifdef __KERNEL__ |
1facf9fc | 8546 | + |
4a4d8108 AM |
8547 | +#include <linux/fs.h> |
8548 | +#include <linux/poll.h> | |
8549 | +#include <linux/aufs_type.h> | |
8550 | +#include "rwsem.h" | |
1facf9fc | 8551 | + |
4a4d8108 AM |
8552 | +struct au_branch; |
8553 | +struct au_hfile { | |
8554 | + struct file *hf_file; | |
8555 | + struct au_branch *hf_br; | |
8556 | +}; | |
1facf9fc | 8557 | + |
4a4d8108 AM |
8558 | +struct au_vdir; |
8559 | +struct au_fidir { | |
8560 | + aufs_bindex_t fd_bbot; | |
8561 | + aufs_bindex_t fd_nent; | |
8562 | + struct au_vdir *fd_vdir_cache; | |
8563 | + struct au_hfile fd_hfile[]; | |
8564 | +}; | |
1facf9fc | 8565 | + |
4a4d8108 | 8566 | +static inline int au_fidir_sz(int nent) |
dece6358 | 8567 | +{ |
4f0767ce JR |
8568 | + AuDebugOn(nent < 0); |
8569 | + return sizeof(struct au_fidir) + sizeof(struct au_hfile) * nent; | |
4a4d8108 | 8570 | +} |
1facf9fc | 8571 | + |
4a4d8108 AM |
8572 | +struct au_finfo { |
8573 | + atomic_t fi_generation; | |
dece6358 | 8574 | + |
4a4d8108 AM |
8575 | + struct au_rwsem fi_rwsem; |
8576 | + aufs_bindex_t fi_btop; | |
8577 | + | |
8578 | + /* do not union them */ | |
8579 | + struct { /* for non-dir */ | |
8580 | + struct au_hfile fi_htop; | |
8581 | + struct vm_operations_struct *fi_hvmop; | |
8582 | + struct mutex fi_vm_mtx; | |
8583 | + struct mutex fi_mmap; | |
8584 | + }; | |
8585 | + struct au_fidir *fi_hdir; /* for dir only */ | |
8586 | +} ____cacheline_aligned_in_smp; | |
1facf9fc | 8587 | + |
4a4d8108 | 8588 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 8589 | + |
4a4d8108 AM |
8590 | +/* file.c */ |
8591 | +extern const struct address_space_operations aufs_aop; | |
8592 | +unsigned int au_file_roflags(unsigned int flags); | |
8593 | +struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags, | |
8594 | + struct file *file); | |
8595 | +int au_do_open(struct file *file, int (*open)(struct file *file, int flags), | |
8596 | + struct au_fidir *fidir); | |
8597 | +int au_reopen_nondir(struct file *file); | |
8598 | +struct au_pin; | |
8599 | +int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin); | |
8600 | +int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file), | |
8601 | + int wlock); | |
8602 | +int au_do_flush(struct file *file, fl_owner_t id, | |
8603 | + int (*flush)(struct file *file, fl_owner_t id)); | |
1facf9fc | 8604 | + |
4a4d8108 AM |
8605 | +/* poll.c */ |
8606 | +#ifdef CONFIG_AUFS_POLL | |
8607 | +unsigned int aufs_poll(struct file *file, poll_table *wait); | |
8608 | +#endif | |
1facf9fc | 8609 | + |
4a4d8108 AM |
8610 | +#ifdef CONFIG_AUFS_BR_HFSPLUS |
8611 | +/* hfsplus.c */ | |
8612 | +struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex); | |
8613 | +void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex, | |
8614 | + struct file *h_file); | |
8615 | +#else | |
8616 | +static inline | |
8617 | +struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex) | |
dece6358 | 8618 | +{ |
4a4d8108 AM |
8619 | + return NULL; |
8620 | +} | |
1facf9fc | 8621 | + |
4a4d8108 AM |
8622 | +AuStubVoid(au_h_open_post, struct dentry *dentry, aufs_bindex_t bindex, |
8623 | + struct file *h_file); | |
8624 | +#endif | |
1facf9fc | 8625 | + |
4a4d8108 AM |
8626 | +/* f_op.c */ |
8627 | +extern const struct file_operations aufs_file_fop; | |
8628 | +extern const struct vm_operations_struct aufs_vm_ops; | |
8629 | +int au_do_open_nondir(struct file *file, int flags); | |
8630 | +int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file); | |
8631 | + | |
8632 | +#ifdef CONFIG_AUFS_SP_IATTR | |
8633 | +/* f_op_sp.c */ | |
8634 | +int au_special_file(umode_t mode); | |
8635 | +void au_init_special_fop(struct inode *inode, umode_t mode, dev_t rdev); | |
8636 | +#else | |
8637 | +AuStubInt0(au_special_file, umode_t mode) | |
8638 | +static inline void au_init_special_fop(struct inode *inode, umode_t mode, | |
8639 | + dev_t rdev) | |
8640 | +{ | |
8641 | + init_special_inode(inode, mode, rdev); | |
8642 | +} | |
8643 | +#endif | |
1facf9fc | 8644 | + |
4a4d8108 AM |
8645 | +/* finfo.c */ |
8646 | +void au_hfput(struct au_hfile *hf, struct file *file); | |
8647 | +void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, | |
8648 | + struct file *h_file); | |
1facf9fc | 8649 | + |
4a4d8108 AM |
8650 | +void au_update_figen(struct file *file); |
8651 | +void au_fi_mmap_lock(struct file *file); | |
8652 | +void au_fi_mmap_unlock(struct file *file); | |
8653 | +struct au_fidir *au_fidir_alloc(struct super_block *sb); | |
8654 | +int au_fidir_realloc(struct au_finfo *finfo, int nbr); | |
1facf9fc | 8655 | + |
4a4d8108 AM |
8656 | +void au_fi_init_once(void *_fi); |
8657 | +void au_finfo_fin(struct file *file); | |
8658 | +int au_finfo_init(struct file *file, struct au_fidir *fidir); | |
1facf9fc | 8659 | + |
4a4d8108 AM |
8660 | +/* ioctl.c */ |
8661 | +long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg); | |
b752ccd1 AM |
8662 | +#ifdef CONFIG_COMPAT |
8663 | +long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd, | |
8664 | + unsigned long arg); | |
8665 | +#endif | |
1facf9fc | 8666 | + |
4a4d8108 | 8667 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 8668 | + |
4a4d8108 AM |
8669 | +static inline struct au_finfo *au_fi(struct file *file) |
8670 | +{ | |
8671 | + return file->private_data; | |
8672 | +} | |
1facf9fc | 8673 | + |
4a4d8108 | 8674 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 8675 | + |
4a4d8108 AM |
8676 | +/* |
8677 | + * fi_read_lock, fi_write_lock, | |
8678 | + * fi_read_unlock, fi_write_unlock, fi_downgrade_lock | |
8679 | + */ | |
8680 | +AuSimpleRwsemFuncs(fi, struct file *f, &au_fi(f)->fi_rwsem); | |
1308ab2a | 8681 | + |
4a4d8108 AM |
8682 | +#define FiMustNoWaiters(f) AuRwMustNoWaiters(&au_fi(f)->fi_rwsem) |
8683 | +#define FiMustAnyLock(f) AuRwMustAnyLock(&au_fi(f)->fi_rwsem) | |
8684 | +#define FiMustWriteLock(f) AuRwMustWriteLock(&au_fi(f)->fi_rwsem) | |
1facf9fc | 8685 | + |
1308ab2a | 8686 | +/* ---------------------------------------------------------------------- */ |
8687 | + | |
4a4d8108 AM |
8688 | +/* todo: hard/soft set? */ |
8689 | +static inline aufs_bindex_t au_fbstart(struct file *file) | |
dece6358 | 8690 | +{ |
4a4d8108 AM |
8691 | + FiMustAnyLock(file); |
8692 | + return au_fi(file)->fi_btop; | |
8693 | +} | |
dece6358 | 8694 | + |
4a4d8108 AM |
8695 | +static inline aufs_bindex_t au_fbend_dir(struct file *file) |
8696 | +{ | |
8697 | + FiMustAnyLock(file); | |
8698 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
8699 | + return au_fi(file)->fi_hdir->fd_bbot; | |
8700 | +} | |
1facf9fc | 8701 | + |
4a4d8108 AM |
8702 | +static inline struct au_vdir *au_fvdir_cache(struct file *file) |
8703 | +{ | |
8704 | + FiMustAnyLock(file); | |
8705 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
8706 | + return au_fi(file)->fi_hdir->fd_vdir_cache; | |
8707 | +} | |
1facf9fc | 8708 | + |
4a4d8108 AM |
8709 | +static inline void au_set_fbstart(struct file *file, aufs_bindex_t bindex) |
8710 | +{ | |
8711 | + FiMustWriteLock(file); | |
8712 | + au_fi(file)->fi_btop = bindex; | |
8713 | +} | |
1facf9fc | 8714 | + |
4a4d8108 AM |
8715 | +static inline void au_set_fbend_dir(struct file *file, aufs_bindex_t bindex) |
8716 | +{ | |
8717 | + FiMustWriteLock(file); | |
8718 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
8719 | + au_fi(file)->fi_hdir->fd_bbot = bindex; | |
8720 | +} | |
1308ab2a | 8721 | + |
4a4d8108 AM |
8722 | +static inline void au_set_fvdir_cache(struct file *file, |
8723 | + struct au_vdir *vdir_cache) | |
8724 | +{ | |
8725 | + FiMustWriteLock(file); | |
8726 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
8727 | + au_fi(file)->fi_hdir->fd_vdir_cache = vdir_cache; | |
8728 | +} | |
dece6358 | 8729 | + |
4a4d8108 AM |
8730 | +static inline struct file *au_hf_top(struct file *file) |
8731 | +{ | |
8732 | + FiMustAnyLock(file); | |
8733 | + AuDebugOn(au_fi(file)->fi_hdir); | |
8734 | + return au_fi(file)->fi_htop.hf_file; | |
8735 | +} | |
1facf9fc | 8736 | + |
4a4d8108 AM |
8737 | +static inline struct file *au_hf_dir(struct file *file, aufs_bindex_t bindex) |
8738 | +{ | |
8739 | + FiMustAnyLock(file); | |
8740 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
8741 | + return au_fi(file)->fi_hdir->fd_hfile[0 + bindex].hf_file; | |
dece6358 AM |
8742 | +} |
8743 | + | |
4a4d8108 AM |
8744 | +/* todo: memory barrier? */ |
8745 | +static inline unsigned int au_figen(struct file *f) | |
dece6358 | 8746 | +{ |
4a4d8108 AM |
8747 | + return atomic_read(&au_fi(f)->fi_generation); |
8748 | +} | |
dece6358 | 8749 | + |
4a4d8108 AM |
8750 | +static inline int au_test_mmapped(struct file *f) |
8751 | +{ | |
8752 | + FiMustAnyLock(f); | |
8753 | + return !!(au_fi(f)->fi_hvmop); | |
8754 | +} | |
1308ab2a | 8755 | + |
4a4d8108 AM |
8756 | +#endif /* __KERNEL__ */ |
8757 | +#endif /* __AUFS_FILE_H__ */ | |
b752ccd1 AM |
8758 | diff -urN /usr/share/empty/fs/aufs/finfo.c linux/fs/aufs/finfo.c |
8759 | --- /usr/share/empty/fs/aufs/finfo.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
8760 | +++ linux/fs/aufs/finfo.c 2010-10-21 09:52:43.090291764 +0200 |
8761 | @@ -0,0 +1,167 @@ | |
4a4d8108 AM |
8762 | +/* |
8763 | + * Copyright (C) 2005-2010 Junjiro R. Okajima | |
8764 | + * | |
8765 | + * This program, aufs is free software; you can redistribute it and/or modify | |
8766 | + * it under the terms of the GNU General Public License as published by | |
8767 | + * the Free Software Foundation; either version 2 of the License, or | |
8768 | + * (at your option) any later version. | |
8769 | + * | |
8770 | + * This program is distributed in the hope that it will be useful, | |
8771 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8772 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
8773 | + * GNU General Public License for more details. | |
8774 | + * | |
8775 | + * You should have received a copy of the GNU General Public License | |
8776 | + * along with this program; if not, write to the Free Software | |
8777 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
8778 | + */ | |
1308ab2a | 8779 | + |
4a4d8108 AM |
8780 | +/* |
8781 | + * file private data | |
8782 | + */ | |
1facf9fc | 8783 | + |
4a4d8108 AM |
8784 | +#include <linux/file.h> |
8785 | +#include "aufs.h" | |
1facf9fc | 8786 | + |
4a4d8108 AM |
8787 | +void au_hfput(struct au_hfile *hf, struct file *file) |
8788 | +{ | |
8789 | + /* todo: direct access f_flags */ | |
8790 | + if (vfsub_file_flags(file) & vfsub_fmode_to_uint(FMODE_EXEC)) | |
8791 | + allow_write_access(hf->hf_file); | |
8792 | + fput(hf->hf_file); | |
8793 | + hf->hf_file = NULL; | |
953406b4 | 8794 | + atomic_dec_return(&hf->hf_br->br_count); |
4a4d8108 AM |
8795 | + hf->hf_br = NULL; |
8796 | +} | |
1facf9fc | 8797 | + |
4a4d8108 AM |
8798 | +void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, struct file *val) |
8799 | +{ | |
8800 | + struct au_finfo *finfo = au_fi(file); | |
8801 | + struct au_hfile *hf; | |
8802 | + struct au_fidir *fidir; | |
8803 | + | |
8804 | + fidir = finfo->fi_hdir; | |
8805 | + if (!fidir) { | |
8806 | + AuDebugOn(finfo->fi_btop != bindex); | |
8807 | + hf = &finfo->fi_htop; | |
8808 | + } else | |
8809 | + hf = fidir->fd_hfile + bindex; | |
8810 | + | |
8811 | + if (hf && hf->hf_file) | |
8812 | + au_hfput(hf, file); | |
8813 | + if (val) { | |
8814 | + FiMustWriteLock(file); | |
8815 | + hf->hf_file = val; | |
8816 | + hf->hf_br = au_sbr(file->f_dentry->d_sb, bindex); | |
1308ab2a | 8817 | + } |
4a4d8108 | 8818 | +} |
1facf9fc | 8819 | + |
4a4d8108 AM |
8820 | +void au_update_figen(struct file *file) |
8821 | +{ | |
8822 | + atomic_set(&au_fi(file)->fi_generation, au_digen(file->f_dentry)); | |
8823 | + /* smp_mb(); */ /* atomic_set */ | |
1facf9fc | 8824 | +} |
8825 | + | |
4a4d8108 AM |
8826 | +/* ---------------------------------------------------------------------- */ |
8827 | + | |
8828 | +void au_fi_mmap_lock(struct file *file) | |
1facf9fc | 8829 | +{ |
4a4d8108 AM |
8830 | + FiMustWriteLock(file); |
8831 | + lockdep_off(); | |
8832 | + mutex_lock(&au_fi(file)->fi_mmap); | |
8833 | + lockdep_on(); | |
8834 | +} | |
1facf9fc | 8835 | + |
4a4d8108 AM |
8836 | +void au_fi_mmap_unlock(struct file *file) |
8837 | +{ | |
8838 | + lockdep_off(); | |
8839 | + mutex_unlock(&au_fi(file)->fi_mmap); | |
8840 | + lockdep_on(); | |
8841 | +} | |
1308ab2a | 8842 | + |
4a4d8108 | 8843 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 8844 | + |
4a4d8108 AM |
8845 | +struct au_fidir *au_fidir_alloc(struct super_block *sb) |
8846 | +{ | |
8847 | + struct au_fidir *fidir; | |
8848 | + int nbr; | |
8849 | + | |
8850 | + nbr = au_sbend(sb) + 1; | |
8851 | + if (nbr < 2) | |
8852 | + nbr = 2; /* initial allocate for 2 branches */ | |
8853 | + fidir = kzalloc(au_fidir_sz(nbr), GFP_NOFS); | |
8854 | + if (fidir) { | |
8855 | + fidir->fd_bbot = -1; | |
8856 | + fidir->fd_nent = nbr; | |
8857 | + fidir->fd_vdir_cache = NULL; | |
8858 | + } | |
8859 | + | |
8860 | + return fidir; | |
8861 | +} | |
8862 | + | |
8863 | +int au_fidir_realloc(struct au_finfo *finfo, int nbr) | |
8864 | +{ | |
8865 | + int err; | |
8866 | + struct au_fidir *fidir, *p; | |
8867 | + | |
8868 | + AuRwMustWriteLock(&finfo->fi_rwsem); | |
8869 | + fidir = finfo->fi_hdir; | |
8870 | + AuDebugOn(!fidir); | |
8871 | + | |
8872 | + err = -ENOMEM; | |
8873 | + p = au_kzrealloc(fidir, au_fidir_sz(fidir->fd_nent), au_fidir_sz(nbr), | |
8874 | + GFP_NOFS); | |
8875 | + if (p) { | |
8876 | + p->fd_nent = nbr; | |
8877 | + finfo->fi_hdir = p; | |
8878 | + err = 0; | |
8879 | + } | |
1facf9fc | 8880 | + |
dece6358 | 8881 | + return err; |
1facf9fc | 8882 | +} |
1308ab2a | 8883 | + |
8884 | +/* ---------------------------------------------------------------------- */ | |
8885 | + | |
4a4d8108 | 8886 | +void au_finfo_fin(struct file *file) |
1308ab2a | 8887 | +{ |
4a4d8108 AM |
8888 | + struct au_finfo *finfo; |
8889 | + | |
8890 | + finfo = au_fi(file); | |
8891 | + AuDebugOn(finfo->fi_hdir); | |
8892 | + AuRwDestroy(&finfo->fi_rwsem); | |
8893 | + au_cache_free_finfo(finfo); | |
1308ab2a | 8894 | +} |
1308ab2a | 8895 | + |
953406b4 | 8896 | +void au_fi_init_once(void *_fi) |
4a4d8108 | 8897 | +{ |
953406b4 | 8898 | + struct au_finfo *fi = _fi; |
1308ab2a | 8899 | + |
953406b4 AM |
8900 | + au_rw_init(&fi->fi_rwsem); |
8901 | + mutex_init(&fi->fi_vm_mtx); | |
8902 | + mutex_init(&fi->fi_mmap); | |
4a4d8108 | 8903 | +} |
1308ab2a | 8904 | + |
4a4d8108 AM |
8905 | +int au_finfo_init(struct file *file, struct au_fidir *fidir) |
8906 | +{ | |
8907 | + int err; | |
8908 | + struct au_finfo *finfo; | |
8909 | + struct dentry *dentry; | |
8910 | + | |
8911 | + err = -ENOMEM; | |
8912 | + dentry = file->f_dentry; | |
8913 | + finfo = au_cache_alloc_finfo(); | |
8914 | + if (unlikely(!finfo)) | |
8915 | + goto out; | |
8916 | + | |
8917 | + err = 0; | |
8918 | + au_rw_write_lock(&finfo->fi_rwsem); | |
8919 | + finfo->fi_btop = -1; | |
8920 | + finfo->fi_hdir = fidir; | |
8921 | + atomic_set(&finfo->fi_generation, au_digen(dentry)); | |
8922 | + /* smp_mb(); */ /* atomic_set */ | |
8923 | + | |
8924 | + file->private_data = finfo; | |
8925 | + | |
8926 | +out: | |
8927 | + return err; | |
8928 | +} | |
b752ccd1 AM |
8929 | diff -urN /usr/share/empty/fs/aufs/f_op.c linux/fs/aufs/f_op.c |
8930 | --- /usr/share/empty/fs/aufs/f_op.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
8931 | +++ linux/fs/aufs/f_op.c 2010-10-21 09:52:43.090291764 +0200 |
8932 | @@ -0,0 +1,886 @@ | |
dece6358 | 8933 | +/* |
4a4d8108 | 8934 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
dece6358 AM |
8935 | + * |
8936 | + * This program, aufs is free software; you can redistribute it and/or modify | |
8937 | + * it under the terms of the GNU General Public License as published by | |
8938 | + * the Free Software Foundation; either version 2 of the License, or | |
8939 | + * (at your option) any later version. | |
8940 | + * | |
8941 | + * This program is distributed in the hope that it will be useful, | |
8942 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8943 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
8944 | + * GNU General Public License for more details. | |
8945 | + * | |
8946 | + * You should have received a copy of the GNU General Public License | |
8947 | + * along with this program; if not, write to the Free Software | |
8948 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
8949 | + */ | |
1facf9fc | 8950 | + |
8951 | +/* | |
4a4d8108 | 8952 | + * file and vm operations |
1facf9fc | 8953 | + */ |
dece6358 AM |
8954 | + |
8955 | +#include <linux/file.h> | |
4a4d8108 AM |
8956 | +#include <linux/fs_stack.h> |
8957 | +#include <linux/mman.h> | |
8958 | +#include <linux/mm.h> | |
8959 | +#include <linux/security.h> | |
dece6358 AM |
8960 | +#include "aufs.h" |
8961 | + | |
4a4d8108 | 8962 | +int au_do_open_nondir(struct file *file, int flags) |
1facf9fc | 8963 | +{ |
4a4d8108 AM |
8964 | + int err; |
8965 | + aufs_bindex_t bindex; | |
8966 | + struct file *h_file; | |
8967 | + struct dentry *dentry; | |
8968 | + struct au_finfo *finfo; | |
8969 | + | |
8970 | + FiMustWriteLock(file); | |
8971 | + | |
8972 | + err = 0; | |
8973 | + dentry = file->f_dentry; | |
8974 | + finfo = au_fi(file); | |
8975 | + memset(&finfo->fi_htop, 0, sizeof(finfo->fi_htop)); | |
8976 | + finfo->fi_hvmop = NULL; | |
8977 | + bindex = au_dbstart(dentry); | |
8978 | + h_file = au_h_open(dentry, bindex, flags, file); | |
8979 | + if (IS_ERR(h_file)) | |
8980 | + err = PTR_ERR(h_file); | |
8981 | + else { | |
8982 | + au_set_fbstart(file, bindex); | |
8983 | + au_set_h_fptr(file, bindex, h_file); | |
8984 | + au_update_figen(file); | |
8985 | + /* todo: necessary? */ | |
8986 | + /* file->f_ra = h_file->f_ra; */ | |
8987 | + } | |
8988 | + return err; | |
1facf9fc | 8989 | +} |
8990 | + | |
4a4d8108 AM |
8991 | +static int aufs_open_nondir(struct inode *inode __maybe_unused, |
8992 | + struct file *file) | |
1facf9fc | 8993 | +{ |
4a4d8108 | 8994 | + int err; |
1308ab2a | 8995 | + struct super_block *sb; |
1facf9fc | 8996 | + |
4a4d8108 AM |
8997 | + AuDbg("%.*s, f_ flags 0x%x, f_mode 0x%x\n", |
8998 | + AuDLNPair(file->f_dentry), vfsub_file_flags(file), | |
8999 | + file->f_mode); | |
1facf9fc | 9000 | + |
4a4d8108 AM |
9001 | + sb = file->f_dentry->d_sb; |
9002 | + si_read_lock(sb, AuLock_FLUSH); | |
9003 | + err = au_do_open(file, au_do_open_nondir, /*fidir*/NULL); | |
9004 | + si_read_unlock(sb); | |
9005 | + return err; | |
9006 | +} | |
1facf9fc | 9007 | + |
4a4d8108 AM |
9008 | +int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file) |
9009 | +{ | |
9010 | + struct au_finfo *finfo; | |
9011 | + aufs_bindex_t bindex; | |
1facf9fc | 9012 | + |
4a4d8108 AM |
9013 | + finfo = au_fi(file); |
9014 | + bindex = finfo->fi_btop; | |
953406b4 | 9015 | + if (bindex >= 0) |
4a4d8108 | 9016 | + au_set_h_fptr(file, bindex, NULL); |
dece6358 | 9017 | + |
4a4d8108 AM |
9018 | + au_finfo_fin(file); |
9019 | + return 0; | |
1facf9fc | 9020 | +} |
9021 | + | |
4a4d8108 AM |
9022 | +/* ---------------------------------------------------------------------- */ |
9023 | + | |
9024 | +static int au_do_flush_nondir(struct file *file, fl_owner_t id) | |
dece6358 | 9025 | +{ |
1308ab2a | 9026 | + int err; |
4a4d8108 AM |
9027 | + struct file *h_file; |
9028 | + | |
9029 | + err = 0; | |
9030 | + h_file = au_hf_top(file); | |
9031 | + if (h_file) | |
9032 | + err = vfsub_flush(h_file, id); | |
9033 | + return err; | |
9034 | +} | |
9035 | + | |
9036 | +static int aufs_flush_nondir(struct file *file, fl_owner_t id) | |
9037 | +{ | |
9038 | + return au_do_flush(file, id, au_do_flush_nondir); | |
9039 | +} | |
9040 | + | |
9041 | +/* ---------------------------------------------------------------------- */ | |
9042 | + | |
9043 | +static ssize_t aufs_read(struct file *file, char __user *buf, size_t count, | |
9044 | + loff_t *ppos) | |
9045 | +{ | |
9046 | + ssize_t err; | |
dece6358 | 9047 | + struct dentry *dentry; |
4a4d8108 | 9048 | + struct file *h_file; |
dece6358 | 9049 | + struct super_block *sb; |
1facf9fc | 9050 | + |
dece6358 AM |
9051 | + dentry = file->f_dentry; |
9052 | + sb = dentry->d_sb; | |
953406b4 | 9053 | + si_read_lock(sb, AuLock_FLUSH); |
4a4d8108 | 9054 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0); |
dece6358 AM |
9055 | + if (unlikely(err)) |
9056 | + goto out; | |
1facf9fc | 9057 | + |
4a4d8108 AM |
9058 | + h_file = au_hf_top(file); |
9059 | + err = vfsub_read_u(h_file, buf, count, ppos); | |
9060 | + /* todo: necessary? */ | |
9061 | + /* file->f_ra = h_file->f_ra; */ | |
9062 | + fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode); | |
1308ab2a | 9063 | + |
4a4d8108 AM |
9064 | + di_read_unlock(dentry, AuLock_IR); |
9065 | + fi_read_unlock(file); | |
4f0767ce | 9066 | +out: |
dece6358 AM |
9067 | + si_read_unlock(sb); |
9068 | + return err; | |
9069 | +} | |
1facf9fc | 9070 | + |
4a4d8108 AM |
9071 | +static ssize_t aufs_write(struct file *file, const char __user *ubuf, |
9072 | + size_t count, loff_t *ppos) | |
dece6358 | 9073 | +{ |
4a4d8108 AM |
9074 | + ssize_t err; |
9075 | + struct au_pin pin; | |
dece6358 | 9076 | + struct dentry *dentry; |
4a4d8108 | 9077 | + struct inode *inode; |
953406b4 | 9078 | + struct super_block *sb; |
4a4d8108 AM |
9079 | + struct file *h_file; |
9080 | + char __user *buf = (char __user *)ubuf; | |
1facf9fc | 9081 | + |
dece6358 | 9082 | + dentry = file->f_dentry; |
953406b4 | 9083 | + sb = dentry->d_sb; |
4a4d8108 | 9084 | + inode = dentry->d_inode; |
953406b4 AM |
9085 | + mutex_lock(&inode->i_mutex); |
9086 | + si_read_lock(sb, AuLock_FLUSH); | |
1facf9fc | 9087 | + |
4a4d8108 AM |
9088 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1); |
9089 | + if (unlikely(err)) | |
9090 | + goto out; | |
1facf9fc | 9091 | + |
4a4d8108 AM |
9092 | + err = au_ready_to_write(file, -1, &pin); |
9093 | + di_downgrade_lock(dentry, AuLock_IR); | |
9094 | + if (unlikely(err)) | |
9095 | + goto out_unlock; | |
1facf9fc | 9096 | + |
4a4d8108 AM |
9097 | + h_file = au_hf_top(file); |
9098 | + au_unpin(&pin); | |
9099 | + err = vfsub_write_u(h_file, buf, count, ppos); | |
9100 | + au_cpup_attr_timesizes(inode); | |
9101 | + inode->i_mode = h_file->f_dentry->d_inode->i_mode; | |
1facf9fc | 9102 | + |
4f0767ce | 9103 | +out_unlock: |
4a4d8108 AM |
9104 | + di_read_unlock(dentry, AuLock_IR); |
9105 | + fi_write_unlock(file); | |
4f0767ce | 9106 | +out: |
953406b4 | 9107 | + si_read_unlock(sb); |
4a4d8108 | 9108 | + mutex_unlock(&inode->i_mutex); |
dece6358 AM |
9109 | + return err; |
9110 | +} | |
1facf9fc | 9111 | + |
4a4d8108 AM |
9112 | +static ssize_t au_do_aio(struct file *h_file, int rw, struct kiocb *kio, |
9113 | + const struct iovec *iov, unsigned long nv, loff_t pos) | |
dece6358 | 9114 | +{ |
4a4d8108 AM |
9115 | + ssize_t err; |
9116 | + struct file *file; | |
9117 | + ssize_t (*func)(struct kiocb *, const struct iovec *, unsigned long, | |
9118 | + loff_t); | |
1facf9fc | 9119 | + |
4a4d8108 AM |
9120 | + err = security_file_permission(h_file, rw); |
9121 | + if (unlikely(err)) | |
9122 | + goto out; | |
1facf9fc | 9123 | + |
4a4d8108 AM |
9124 | + err = -ENOSYS; |
9125 | + func = NULL; | |
9126 | + if (rw == MAY_READ) | |
9127 | + func = h_file->f_op->aio_read; | |
9128 | + else if (rw == MAY_WRITE) | |
9129 | + func = h_file->f_op->aio_write; | |
9130 | + if (func) { | |
9131 | + file = kio->ki_filp; | |
9132 | + kio->ki_filp = h_file; | |
9133 | + err = func(kio, iov, nv, pos); | |
9134 | + kio->ki_filp = file; | |
9135 | + } else | |
9136 | + /* currently there is no such fs */ | |
9137 | + WARN_ON_ONCE(1); | |
1facf9fc | 9138 | + |
4f0767ce | 9139 | +out: |
dece6358 AM |
9140 | + return err; |
9141 | +} | |
1facf9fc | 9142 | + |
4a4d8108 AM |
9143 | +static ssize_t aufs_aio_read(struct kiocb *kio, const struct iovec *iov, |
9144 | + unsigned long nv, loff_t pos) | |
1facf9fc | 9145 | +{ |
4a4d8108 AM |
9146 | + ssize_t err; |
9147 | + struct file *file, *h_file; | |
9148 | + struct dentry *dentry; | |
dece6358 | 9149 | + struct super_block *sb; |
1facf9fc | 9150 | + |
4a4d8108 | 9151 | + file = kio->ki_filp; |
dece6358 | 9152 | + dentry = file->f_dentry; |
1308ab2a | 9153 | + sb = dentry->d_sb; |
953406b4 | 9154 | + si_read_lock(sb, AuLock_FLUSH); |
4a4d8108 AM |
9155 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0); |
9156 | + if (unlikely(err)) | |
9157 | + goto out; | |
9158 | + | |
9159 | + h_file = au_hf_top(file); | |
9160 | + err = au_do_aio(h_file, MAY_READ, kio, iov, nv, pos); | |
9161 | + /* todo: necessary? */ | |
9162 | + /* file->f_ra = h_file->f_ra; */ | |
9163 | + fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode); | |
9164 | + di_read_unlock(dentry, AuLock_IR); | |
9165 | + fi_read_unlock(file); | |
1facf9fc | 9166 | + |
4f0767ce | 9167 | +out: |
4a4d8108 | 9168 | + si_read_unlock(sb); |
1308ab2a | 9169 | + return err; |
9170 | +} | |
1facf9fc | 9171 | + |
4a4d8108 AM |
9172 | +static ssize_t aufs_aio_write(struct kiocb *kio, const struct iovec *iov, |
9173 | + unsigned long nv, loff_t pos) | |
1308ab2a | 9174 | +{ |
4a4d8108 AM |
9175 | + ssize_t err; |
9176 | + struct au_pin pin; | |
9177 | + struct dentry *dentry; | |
9178 | + struct inode *inode; | |
953406b4 | 9179 | + struct super_block *sb; |
4a4d8108 | 9180 | + struct file *file, *h_file; |
1308ab2a | 9181 | + |
4a4d8108 | 9182 | + file = kio->ki_filp; |
1308ab2a | 9183 | + dentry = file->f_dentry; |
953406b4 | 9184 | + sb = dentry->d_sb; |
1308ab2a | 9185 | + inode = dentry->d_inode; |
953406b4 AM |
9186 | + mutex_lock(&inode->i_mutex); |
9187 | + si_read_lock(sb, AuLock_FLUSH); | |
4a4d8108 AM |
9188 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1); |
9189 | + if (unlikely(err)) | |
1308ab2a | 9190 | + goto out; |
1facf9fc | 9191 | + |
4a4d8108 AM |
9192 | + err = au_ready_to_write(file, -1, &pin); |
9193 | + di_downgrade_lock(dentry, AuLock_IR); | |
dece6358 | 9194 | + if (unlikely(err)) |
4a4d8108 | 9195 | + goto out_unlock; |
1facf9fc | 9196 | + |
4a4d8108 AM |
9197 | + au_unpin(&pin); |
9198 | + h_file = au_hf_top(file); | |
9199 | + err = au_do_aio(h_file, MAY_WRITE, kio, iov, nv, pos); | |
9200 | + au_cpup_attr_timesizes(inode); | |
9201 | + inode->i_mode = h_file->f_dentry->d_inode->i_mode; | |
1facf9fc | 9202 | + |
4f0767ce | 9203 | +out_unlock: |
4a4d8108 AM |
9204 | + di_read_unlock(dentry, AuLock_IR); |
9205 | + fi_write_unlock(file); | |
4f0767ce | 9206 | +out: |
953406b4 | 9207 | + si_read_unlock(sb); |
4a4d8108 | 9208 | + mutex_unlock(&inode->i_mutex); |
dece6358 | 9209 | + return err; |
1facf9fc | 9210 | +} |
9211 | + | |
4a4d8108 AM |
9212 | +static ssize_t aufs_splice_read(struct file *file, loff_t *ppos, |
9213 | + struct pipe_inode_info *pipe, size_t len, | |
9214 | + unsigned int flags) | |
1facf9fc | 9215 | +{ |
4a4d8108 AM |
9216 | + ssize_t err; |
9217 | + struct file *h_file; | |
9218 | + struct dentry *dentry; | |
dece6358 | 9219 | + struct super_block *sb; |
1facf9fc | 9220 | + |
dece6358 | 9221 | + dentry = file->f_dentry; |
dece6358 | 9222 | + sb = dentry->d_sb; |
953406b4 | 9223 | + si_read_lock(sb, AuLock_FLUSH); |
4a4d8108 AM |
9224 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0); |
9225 | + if (unlikely(err)) | |
dece6358 | 9226 | + goto out; |
1facf9fc | 9227 | + |
4a4d8108 AM |
9228 | + err = -EINVAL; |
9229 | + h_file = au_hf_top(file); | |
9230 | + if (au_test_loopback_kthread()) { | |
9231 | + file->f_mapping = h_file->f_mapping; | |
9232 | + smp_mb(); /* unnecessary? */ | |
1308ab2a | 9233 | + } |
4a4d8108 AM |
9234 | + err = vfsub_splice_to(h_file, ppos, pipe, len, flags); |
9235 | + /* todo: necessasry? */ | |
9236 | + /* file->f_ra = h_file->f_ra; */ | |
9237 | + fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode); | |
1facf9fc | 9238 | + |
4a4d8108 AM |
9239 | + di_read_unlock(dentry, AuLock_IR); |
9240 | + fi_read_unlock(file); | |
1facf9fc | 9241 | + |
4f0767ce | 9242 | +out: |
4a4d8108 | 9243 | + si_read_unlock(sb); |
dece6358 | 9244 | + return err; |
1facf9fc | 9245 | +} |
9246 | + | |
4a4d8108 AM |
9247 | +static ssize_t |
9248 | +aufs_splice_write(struct pipe_inode_info *pipe, struct file *file, loff_t *ppos, | |
9249 | + size_t len, unsigned int flags) | |
1facf9fc | 9250 | +{ |
4a4d8108 AM |
9251 | + ssize_t err; |
9252 | + struct au_pin pin; | |
9253 | + struct dentry *dentry; | |
9254 | + struct inode *inode; | |
953406b4 | 9255 | + struct super_block *sb; |
4a4d8108 | 9256 | + struct file *h_file; |
1facf9fc | 9257 | + |
4a4d8108 AM |
9258 | + dentry = file->f_dentry; |
9259 | + inode = dentry->d_inode; | |
953406b4 AM |
9260 | + mutex_lock(&inode->i_mutex); |
9261 | + sb = dentry->d_sb; | |
9262 | + si_read_lock(sb, AuLock_FLUSH); | |
9263 | + | |
4a4d8108 AM |
9264 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1); |
9265 | + if (unlikely(err)) | |
9266 | + goto out; | |
1facf9fc | 9267 | + |
4a4d8108 AM |
9268 | + err = au_ready_to_write(file, -1, &pin); |
9269 | + di_downgrade_lock(dentry, AuLock_IR); | |
9270 | + if (unlikely(err)) | |
9271 | + goto out_unlock; | |
1facf9fc | 9272 | + |
4a4d8108 AM |
9273 | + h_file = au_hf_top(file); |
9274 | + au_unpin(&pin); | |
9275 | + err = vfsub_splice_from(pipe, h_file, ppos, len, flags); | |
9276 | + au_cpup_attr_timesizes(inode); | |
9277 | + inode->i_mode = h_file->f_dentry->d_inode->i_mode; | |
1facf9fc | 9278 | + |
4f0767ce | 9279 | +out_unlock: |
4a4d8108 AM |
9280 | + di_read_unlock(dentry, AuLock_IR); |
9281 | + fi_write_unlock(file); | |
4f0767ce | 9282 | +out: |
953406b4 | 9283 | + si_read_unlock(sb); |
4a4d8108 AM |
9284 | + mutex_unlock(&inode->i_mutex); |
9285 | + return err; | |
9286 | +} | |
1facf9fc | 9287 | + |
4a4d8108 AM |
9288 | +/* ---------------------------------------------------------------------- */ |
9289 | + | |
9290 | +static struct file *au_safe_file(struct vm_area_struct *vma) | |
9291 | +{ | |
9292 | + struct file *file; | |
9293 | + | |
9294 | + file = vma->vm_file; | |
9295 | + if (file->private_data && au_test_aufs(file->f_dentry->d_sb)) | |
9296 | + return file; | |
9297 | + return NULL; | |
1facf9fc | 9298 | +} |
9299 | + | |
4a4d8108 | 9300 | +static void au_reset_file(struct vm_area_struct *vma, struct file *file) |
1facf9fc | 9301 | +{ |
4a4d8108 AM |
9302 | + vma->vm_file = file; |
9303 | + /* smp_mb(); */ /* flush vm_file */ | |
9304 | +} | |
1facf9fc | 9305 | + |
4a4d8108 AM |
9306 | +static int aufs_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9307 | +{ | |
9308 | + int err; | |
9309 | + static DECLARE_WAIT_QUEUE_HEAD(wq); | |
9310 | + struct file *file, *h_file; | |
9311 | + struct au_finfo *finfo; | |
1facf9fc | 9312 | + |
4a4d8108 AM |
9313 | + /* todo: non-robr mode, user vm_file as it is? */ |
9314 | + wait_event(wq, (file = au_safe_file(vma))); | |
1facf9fc | 9315 | + |
4a4d8108 AM |
9316 | + /* do not revalidate, no si lock */ |
9317 | + finfo = au_fi(file); | |
9318 | + AuDebugOn(finfo->fi_hdir); | |
9319 | + h_file = finfo->fi_htop.hf_file; | |
9320 | + AuDebugOn(!h_file || !finfo->fi_hvmop); | |
9321 | + | |
9322 | + mutex_lock(&finfo->fi_vm_mtx); | |
9323 | + vma->vm_file = h_file; | |
9324 | + err = finfo->fi_hvmop->fault(vma, vmf); | |
9325 | + /* todo: necessary? */ | |
9326 | + /* file->f_ra = h_file->f_ra; */ | |
9327 | + au_reset_file(vma, file); | |
9328 | + mutex_unlock(&finfo->fi_vm_mtx); | |
9329 | +#if 0 /* def CONFIG_SMP */ | |
9330 | + /* wake_up_nr(&wq, online_cpu - 1); */ | |
9331 | + wake_up_all(&wq); | |
9332 | +#else | |
9333 | + wake_up(&wq); | |
9334 | +#endif | |
1facf9fc | 9335 | + |
dece6358 | 9336 | + return err; |
1facf9fc | 9337 | +} |
9338 | + | |
4a4d8108 | 9339 | +static int aufs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
1facf9fc | 9340 | +{ |
dece6358 | 9341 | + int err; |
4a4d8108 AM |
9342 | + static DECLARE_WAIT_QUEUE_HEAD(wq); |
9343 | + struct file *file, *h_file; | |
9344 | + struct au_finfo *finfo; | |
1facf9fc | 9345 | + |
4a4d8108 | 9346 | + wait_event(wq, (file = au_safe_file(vma))); |
1facf9fc | 9347 | + |
4a4d8108 AM |
9348 | + finfo = au_fi(file); |
9349 | + AuDebugOn(finfo->fi_hdir); | |
9350 | + h_file = finfo->fi_htop.hf_file; | |
9351 | + AuDebugOn(!h_file || !finfo->fi_hvmop); | |
1facf9fc | 9352 | + |
4a4d8108 AM |
9353 | + mutex_lock(&finfo->fi_vm_mtx); |
9354 | + vma->vm_file = h_file; | |
9355 | + err = finfo->fi_hvmop->page_mkwrite(vma, vmf); | |
9356 | + au_reset_file(vma, file); | |
9357 | + mutex_unlock(&finfo->fi_vm_mtx); | |
9358 | + wake_up(&wq); | |
1308ab2a | 9359 | + |
dece6358 | 9360 | + return err; |
1facf9fc | 9361 | +} |
9362 | + | |
4a4d8108 | 9363 | +static void aufs_vm_close(struct vm_area_struct *vma) |
1facf9fc | 9364 | +{ |
4a4d8108 AM |
9365 | + static DECLARE_WAIT_QUEUE_HEAD(wq); |
9366 | + struct file *file, *h_file; | |
9367 | + struct au_finfo *finfo; | |
dece6358 | 9368 | + |
4a4d8108 | 9369 | + wait_event(wq, (file = au_safe_file(vma))); |
dece6358 | 9370 | + |
4a4d8108 AM |
9371 | + finfo = au_fi(file); |
9372 | + AuDebugOn(finfo->fi_hdir); | |
9373 | + h_file = finfo->fi_htop.hf_file; | |
9374 | + AuDebugOn(!h_file || !finfo->fi_hvmop); | |
1facf9fc | 9375 | + |
4a4d8108 AM |
9376 | + mutex_lock(&finfo->fi_vm_mtx); |
9377 | + vma->vm_file = h_file; | |
9378 | + finfo->fi_hvmop->close(vma); | |
9379 | + au_reset_file(vma, file); | |
9380 | + mutex_unlock(&finfo->fi_vm_mtx); | |
9381 | + wake_up(&wq); | |
9382 | +} | |
1facf9fc | 9383 | + |
4a4d8108 AM |
9384 | +const struct vm_operations_struct aufs_vm_ops = { |
9385 | + .close = aufs_vm_close, | |
9386 | + .fault = aufs_fault, | |
9387 | + .page_mkwrite = aufs_page_mkwrite | |
1308ab2a | 9388 | +}; |
dece6358 | 9389 | + |
1308ab2a | 9390 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 9391 | + |
4a4d8108 AM |
9392 | +/* cf. linux/include/linux/mman.h: calc_vm_prot_bits() */ |
9393 | +#define AuConv_VM_PROT(f, b) _calc_vm_trans(f, VM_##b, PROT_##b) | |
1308ab2a | 9394 | + |
4a4d8108 | 9395 | +static unsigned long au_arch_prot_conv(unsigned long flags) |
dece6358 | 9396 | +{ |
4a4d8108 AM |
9397 | + /* currently ppc64 only */ |
9398 | +#ifdef CONFIG_PPC64 | |
9399 | + /* cf. linux/arch/powerpc/include/asm/mman.h */ | |
9400 | + AuDebugOn(arch_calc_vm_prot_bits(-1) != VM_SAO); | |
9401 | + return AuConv_VM_PROT(flags, SAO); | |
9402 | +#else | |
9403 | + AuDebugOn(arch_calc_vm_prot_bits(-1)); | |
9404 | + return 0; | |
9405 | +#endif | |
dece6358 AM |
9406 | +} |
9407 | + | |
4a4d8108 | 9408 | +static unsigned long au_prot_conv(unsigned long flags) |
dece6358 | 9409 | +{ |
4a4d8108 AM |
9410 | + return AuConv_VM_PROT(flags, READ) |
9411 | + | AuConv_VM_PROT(flags, WRITE) | |
9412 | + | AuConv_VM_PROT(flags, EXEC) | |
9413 | + | au_arch_prot_conv(flags); | |
dece6358 AM |
9414 | +} |
9415 | + | |
4a4d8108 AM |
9416 | +/* cf. linux/include/linux/mman.h: calc_vm_flag_bits() */ |
9417 | +#define AuConv_VM_MAP(f, b) _calc_vm_trans(f, VM_##b, MAP_##b) | |
dece6358 | 9418 | + |
4a4d8108 | 9419 | +static unsigned long au_flag_conv(unsigned long flags) |
dece6358 | 9420 | +{ |
4a4d8108 AM |
9421 | + return AuConv_VM_MAP(flags, GROWSDOWN) |
9422 | + | AuConv_VM_MAP(flags, DENYWRITE) | |
9423 | + | AuConv_VM_MAP(flags, EXECUTABLE) | |
9424 | + | AuConv_VM_MAP(flags, LOCKED); | |
dece6358 AM |
9425 | +} |
9426 | + | |
4a4d8108 AM |
9427 | +static struct vm_operations_struct * |
9428 | +au_hvmop(struct file *h_file, struct vm_area_struct *vma, unsigned long *flags) | |
dece6358 | 9429 | +{ |
4a4d8108 AM |
9430 | + struct vm_operations_struct *h_vmop; |
9431 | + unsigned long prot; | |
9432 | + int err; | |
dece6358 | 9433 | + |
4a4d8108 AM |
9434 | + h_vmop = ERR_PTR(-ENODEV); |
9435 | + if (!h_file->f_op || !h_file->f_op->mmap) | |
9436 | + goto out; | |
dece6358 | 9437 | + |
4a4d8108 AM |
9438 | + prot = au_prot_conv(vma->vm_flags); |
9439 | + err = security_file_mmap(h_file, /*reqprot*/prot, prot, | |
9440 | + au_flag_conv(vma->vm_flags), vma->vm_start, 0); | |
9441 | + h_vmop = ERR_PTR(err); | |
9442 | + if (unlikely(err)) | |
9443 | + goto out; | |
dece6358 | 9444 | + |
4a4d8108 AM |
9445 | + err = h_file->f_op->mmap(h_file, vma); |
9446 | + h_vmop = ERR_PTR(err); | |
9447 | + if (unlikely(err)) | |
9448 | + goto out; | |
dece6358 | 9449 | + |
4a4d8108 AM |
9450 | + /* oops, it became 'const' */ |
9451 | + h_vmop = (struct vm_operations_struct *)vma->vm_ops; | |
9452 | + *flags = vma->vm_flags; | |
9453 | + err = do_munmap(current->mm, vma->vm_start, | |
9454 | + vma->vm_end - vma->vm_start); | |
9455 | + if (unlikely(err)) { | |
9456 | + AuIOErr("failed internal unmapping %.*s, %d\n", | |
9457 | + AuDLNPair(h_file->f_dentry), err); | |
9458 | + h_vmop = ERR_PTR(-EIO); | |
9459 | + } | |
dece6358 | 9460 | + |
4f0767ce | 9461 | +out: |
4a4d8108 | 9462 | + return h_vmop; |
dece6358 AM |
9463 | +} |
9464 | + | |
1308ab2a | 9465 | +/* |
4a4d8108 AM |
9466 | + * This is another ugly approach to keep the lock order, particularly |
9467 | + * mm->mmap_sem and aufs rwsem. The previous approach was reverted and you can | |
9468 | + * find it in git-log, if you want. | |
1308ab2a | 9469 | + * |
4a4d8108 AM |
9470 | + * native readdir: i_mutex, copy_to_user, mmap_sem |
9471 | + * aufs readdir: i_mutex, rwsem, nested-i_mutex, copy_to_user, mmap_sem | |
1308ab2a | 9472 | + * |
4a4d8108 AM |
9473 | + * Before aufs_mmap() mmap_sem is acquired already, but aufs_mmap() has to |
9474 | + * acquire aufs rwsem. It introduces a circular locking dependency. | |
9475 | + * To address this problem, aufs_mmap() delegates the part which requires aufs | |
9476 | + * rwsem to its internal workqueue. | |
1308ab2a | 9477 | + */ |
9478 | + | |
4a4d8108 AM |
9479 | +/* very ugly approach */ |
9480 | +#include "mtx.h" | |
1308ab2a | 9481 | + |
4a4d8108 AM |
9482 | +struct au_mmap_pre_args { |
9483 | + /* input */ | |
9484 | + struct file *file; | |
9485 | + struct vm_area_struct *vma; | |
1308ab2a | 9486 | + |
4a4d8108 AM |
9487 | + /* output */ |
9488 | + int *errp; | |
9489 | + struct file *h_file; | |
9490 | + struct au_branch *br; | |
9491 | + int mmapped; | |
9492 | +}; | |
dece6358 | 9493 | + |
4a4d8108 AM |
9494 | +static int au_mmap_pre(struct file *file, struct vm_area_struct *vma, |
9495 | + struct file **h_file, struct au_branch **br, | |
9496 | + int *mmapped) | |
dece6358 | 9497 | +{ |
4a4d8108 AM |
9498 | + int err; |
9499 | + aufs_bindex_t bstart; | |
9500 | + const unsigned char wlock | |
9501 | + = !!(file->f_mode & FMODE_WRITE) && (vma->vm_flags & VM_SHARED); | |
9502 | + struct dentry *dentry; | |
9503 | + struct super_block *sb; | |
1308ab2a | 9504 | + |
4a4d8108 AM |
9505 | + dentry = file->f_dentry; |
9506 | + sb = dentry->d_sb; | |
953406b4 | 9507 | + si_read_lock(sb, !AuLock_FLUSH); |
4a4d8108 AM |
9508 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1); |
9509 | + if (unlikely(err)) | |
9510 | + goto out; | |
9511 | + | |
9512 | + *mmapped = !!au_test_mmapped(file); | |
9513 | + if (wlock) { | |
9514 | + struct au_pin pin; | |
9515 | + | |
9516 | + err = au_ready_to_write(file, -1, &pin); | |
9517 | + di_write_unlock(dentry); | |
9518 | + if (unlikely(err)) | |
9519 | + goto out_unlock; | |
9520 | + au_unpin(&pin); | |
9521 | + } else | |
9522 | + di_write_unlock(dentry); | |
9523 | + bstart = au_fbstart(file); | |
9524 | + *br = au_sbr(sb, bstart); | |
9525 | + *h_file = au_hf_top(file); | |
9526 | + get_file(*h_file); | |
9527 | + au_fi_mmap_lock(file); | |
9528 | + | |
9529 | +out_unlock: | |
9530 | + fi_write_unlock(file); | |
9531 | +out: | |
9532 | + si_read_unlock(sb); | |
9533 | + return err; | |
dece6358 AM |
9534 | +} |
9535 | + | |
4a4d8108 | 9536 | +static void au_call_mmap_pre(void *args) |
dece6358 | 9537 | +{ |
4a4d8108 AM |
9538 | + struct au_mmap_pre_args *a = args; |
9539 | + *a->errp = au_mmap_pre(a->file, a->vma, &a->h_file, &a->br, | |
9540 | + &a->mmapped); | |
dece6358 AM |
9541 | +} |
9542 | + | |
4a4d8108 | 9543 | +static int aufs_mmap(struct file *file, struct vm_area_struct *vma) |
dece6358 | 9544 | +{ |
4a4d8108 AM |
9545 | + int err, wkq_err; |
9546 | + unsigned long h_vmflags; | |
1308ab2a | 9547 | + struct au_finfo *finfo; |
4a4d8108 AM |
9548 | + struct dentry *h_dentry; |
9549 | + struct vm_operations_struct *h_vmop, *vmop; | |
9550 | + struct au_mmap_pre_args args = { | |
9551 | + .file = file, | |
9552 | + .vma = vma, | |
9553 | + .errp = &err | |
9554 | + }; | |
9555 | + | |
b752ccd1 | 9556 | + wkq_err = au_wkq_wait_pre(au_call_mmap_pre, &args); |
4a4d8108 AM |
9557 | + if (unlikely(wkq_err)) |
9558 | + err = wkq_err; | |
9559 | + if (unlikely(err)) | |
9560 | + goto out; | |
9561 | + finfo = au_fi(file); | |
9562 | + mutex_set_owner(&finfo->fi_mmap); | |
9563 | + | |
9564 | + h_dentry = args.h_file->f_dentry; | |
9565 | + if (!args.mmapped && au_test_fs_bad_mapping(h_dentry->d_sb)) { | |
1308ab2a | 9566 | + /* |
4a4d8108 AM |
9567 | + * by this assignment, f_mapping will differs from aufs inode |
9568 | + * i_mapping. | |
9569 | + * if someone else mixes the use of f_dentry->d_inode and | |
9570 | + * f_mapping->host, then a problem may arise. | |
1308ab2a | 9571 | + */ |
4a4d8108 AM |
9572 | + file->f_mapping = args.h_file->f_mapping; |
9573 | + } | |
1308ab2a | 9574 | + |
4a4d8108 AM |
9575 | + /* always try this internal mmap to get vma flags */ |
9576 | + h_vmflags = 0; /* gcc warning */ | |
9577 | + h_vmop = au_hvmop(args.h_file, vma, &h_vmflags); | |
9578 | + err = PTR_ERR(h_vmop); | |
9579 | + if (IS_ERR(h_vmop)) | |
9580 | + goto out_unlock; | |
9581 | + AuDebugOn(args.mmapped && h_vmop != finfo->fi_hvmop); | |
9582 | + | |
9583 | + vmop = (void *)au_dy_vmop(file, args.br, h_vmop); | |
9584 | + err = PTR_ERR(vmop); | |
9585 | + if (IS_ERR(vmop)) | |
9586 | + goto out_unlock; | |
9587 | + | |
9588 | + /* | |
9589 | + * unnecessary to handle MAP_DENYWRITE and deny_write_access()? | |
9590 | + * currently MAP_DENYWRITE from userspace is ignored, but elf loader | |
9591 | + * sets it. when FMODE_EXEC is set (by open_exec() or sys_uselib()), | |
9592 | + * both of the aufs file and the lower file is deny_write_access()-ed. | |
9593 | + * finally I hope we can skip handlling MAP_DENYWRITE here. | |
9594 | + */ | |
9595 | + err = generic_file_mmap(file, vma); | |
9596 | + if (unlikely(err)) | |
9597 | + goto out_unlock; | |
9598 | + | |
9599 | + vma->vm_ops = vmop; | |
9600 | + vma->vm_flags = h_vmflags; | |
9601 | + if (!args.mmapped) | |
9602 | + finfo->fi_hvmop = h_vmop; | |
9603 | + | |
9604 | + vfsub_file_accessed(args.h_file); | |
9605 | + /* update without lock, I don't think it a problem */ | |
9606 | + fsstack_copy_attr_atime(file->f_dentry->d_inode, h_dentry->d_inode); | |
9607 | + | |
4f0767ce | 9608 | +out_unlock: |
4a4d8108 AM |
9609 | + au_fi_mmap_unlock(file); |
9610 | + fput(args.h_file); | |
4f0767ce | 9611 | +out: |
4a4d8108 AM |
9612 | + return err; |
9613 | +} | |
9614 | + | |
9615 | +/* ---------------------------------------------------------------------- */ | |
9616 | + | |
b752ccd1 | 9617 | +static int aufs_fsync_nondir(struct file *file, int datasync) |
4a4d8108 AM |
9618 | +{ |
9619 | + int err; | |
9620 | + struct au_pin pin; | |
b752ccd1 | 9621 | + struct dentry *dentry; |
4a4d8108 AM |
9622 | + struct inode *inode; |
9623 | + struct file *h_file; | |
9624 | + struct super_block *sb; | |
9625 | + | |
b752ccd1 | 9626 | + dentry = file->f_dentry; |
4a4d8108 AM |
9627 | + inode = dentry->d_inode; |
9628 | + IMustLock(file->f_mapping->host); | |
9629 | + if (inode != file->f_mapping->host) { | |
9630 | + mutex_unlock(&file->f_mapping->host->i_mutex); | |
9631 | + mutex_lock(&inode->i_mutex); | |
9632 | + } | |
9633 | + IMustLock(inode); | |
9634 | + | |
9635 | + sb = dentry->d_sb; | |
953406b4 | 9636 | + si_read_lock(sb, AuLock_FLUSH); |
4a4d8108 AM |
9637 | + |
9638 | + err = 0; /* -EBADF; */ /* posix? */ | |
9639 | + if (unlikely(!(file->f_mode & FMODE_WRITE))) | |
953406b4 | 9640 | + goto out; |
4a4d8108 AM |
9641 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1); |
9642 | + if (unlikely(err)) | |
953406b4 | 9643 | + goto out; |
4a4d8108 AM |
9644 | + |
9645 | + err = au_ready_to_write(file, -1, &pin); | |
9646 | + di_downgrade_lock(dentry, AuLock_IR); | |
9647 | + if (unlikely(err)) | |
9648 | + goto out_unlock; | |
9649 | + au_unpin(&pin); | |
9650 | + | |
9651 | + err = -EINVAL; | |
9652 | + h_file = au_hf_top(file); | |
9653 | + if (h_file->f_op && h_file->f_op->fsync) { | |
4a4d8108 AM |
9654 | + struct mutex *h_mtx; |
9655 | + | |
9656 | + /* | |
9657 | + * no filemap_fdatawrite() since aufs file has no its own | |
9658 | + * mapping, but dir. | |
9659 | + */ | |
b752ccd1 | 9660 | + h_mtx = &h_file->f_dentry->d_inode->i_mutex; |
4a4d8108 | 9661 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); |
b752ccd1 | 9662 | + err = h_file->f_op->fsync(h_file, datasync); |
4a4d8108 AM |
9663 | + if (!err) |
9664 | + vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); | |
9665 | + /*ignore*/ | |
9666 | + au_cpup_attr_timesizes(inode); | |
9667 | + mutex_unlock(h_mtx); | |
9668 | + } | |
9669 | + | |
4f0767ce | 9670 | +out_unlock: |
4a4d8108 | 9671 | + di_read_unlock(dentry, AuLock_IR); |
1308ab2a | 9672 | + fi_write_unlock(file); |
4f0767ce | 9673 | +out: |
953406b4 | 9674 | + si_read_unlock(sb); |
4a4d8108 AM |
9675 | + if (inode != file->f_mapping->host) { |
9676 | + mutex_unlock(&inode->i_mutex); | |
9677 | + mutex_lock(&file->f_mapping->host->i_mutex); | |
9678 | + } | |
9679 | + return err; | |
dece6358 AM |
9680 | +} |
9681 | + | |
4a4d8108 AM |
9682 | +/* no one supports this operation, currently */ |
9683 | +#if 0 | |
9684 | +static int aufs_aio_fsync_nondir(struct kiocb *kio, int datasync) | |
dece6358 | 9685 | +{ |
4a4d8108 AM |
9686 | + int err; |
9687 | + struct au_pin pin; | |
1308ab2a | 9688 | + struct dentry *dentry; |
4a4d8108 AM |
9689 | + struct inode *inode; |
9690 | + struct file *file, *h_file; | |
953406b4 | 9691 | + struct super_block *sb; |
1308ab2a | 9692 | + |
4a4d8108 | 9693 | + file = kio->ki_filp; |
1308ab2a | 9694 | + dentry = file->f_dentry; |
4a4d8108 | 9695 | + inode = dentry->d_inode; |
953406b4 AM |
9696 | + mutex_lock(&inode->i_mutex); |
9697 | + | |
9698 | + sb = dentry->d_sb; | |
9699 | + si_read_lock(sb, AuLock_FLUSH); | |
4a4d8108 AM |
9700 | + |
9701 | + err = 0; /* -EBADF; */ /* posix? */ | |
9702 | + if (unlikely(!(file->f_mode & FMODE_WRITE))) | |
9703 | + goto out; | |
9704 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1); | |
9705 | + if (unlikely(err)) | |
1308ab2a | 9706 | + goto out; |
9707 | + | |
4a4d8108 AM |
9708 | + err = au_ready_to_write(file, -1, &pin); |
9709 | + di_downgrade_lock(dentry, AuLock_IR); | |
9710 | + if (unlikely(err)) | |
9711 | + goto out_unlock; | |
9712 | + au_unpin(&pin); | |
1308ab2a | 9713 | + |
4a4d8108 AM |
9714 | + err = -ENOSYS; |
9715 | + h_file = au_hf_top(file); | |
9716 | + if (h_file->f_op && h_file->f_op->aio_fsync) { | |
9717 | + struct dentry *h_d; | |
9718 | + struct mutex *h_mtx; | |
1308ab2a | 9719 | + |
4a4d8108 AM |
9720 | + h_d = h_file->f_dentry; |
9721 | + h_mtx = &h_d->d_inode->i_mutex; | |
9722 | + if (!is_sync_kiocb(kio)) { | |
9723 | + get_file(h_file); | |
9724 | + fput(file); | |
9725 | + } | |
9726 | + kio->ki_filp = h_file; | |
9727 | + err = h_file->f_op->aio_fsync(kio, datasync); | |
9728 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); | |
9729 | + if (!err) | |
9730 | + vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); | |
9731 | + /*ignore*/ | |
9732 | + au_cpup_attr_timesizes(inode); | |
9733 | + mutex_unlock(h_mtx); | |
9734 | + } | |
1308ab2a | 9735 | + |
4f0767ce | 9736 | +out_unlock: |
4a4d8108 AM |
9737 | + di_read_unlock(dentry, AuLock_IR); |
9738 | + fi_write_unlock(file); | |
4f0767ce | 9739 | +out: |
953406b4 | 9740 | + si_read_unlock(sb); |
4a4d8108 AM |
9741 | + mutex_unlock(&inode->i_mutex); |
9742 | + return err; | |
dece6358 | 9743 | +} |
4a4d8108 | 9744 | +#endif |
dece6358 | 9745 | + |
4a4d8108 | 9746 | +static int aufs_fasync(int fd, struct file *file, int flag) |
dece6358 | 9747 | +{ |
4a4d8108 AM |
9748 | + int err; |
9749 | + struct file *h_file; | |
9750 | + struct dentry *dentry; | |
9751 | + struct super_block *sb; | |
1308ab2a | 9752 | + |
4a4d8108 AM |
9753 | + dentry = file->f_dentry; |
9754 | + sb = dentry->d_sb; | |
953406b4 | 9755 | + si_read_lock(sb, AuLock_FLUSH); |
4a4d8108 AM |
9756 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0); |
9757 | + if (unlikely(err)) | |
9758 | + goto out; | |
9759 | + | |
9760 | + h_file = au_hf_top(file); | |
9761 | + if (h_file->f_op && h_file->f_op->fasync) | |
9762 | + err = h_file->f_op->fasync(fd, h_file, flag); | |
9763 | + | |
9764 | + di_read_unlock(dentry, AuLock_IR); | |
9765 | + fi_read_unlock(file); | |
1308ab2a | 9766 | + |
4f0767ce | 9767 | +out: |
4a4d8108 | 9768 | + si_read_unlock(sb); |
1308ab2a | 9769 | + return err; |
dece6358 | 9770 | +} |
4a4d8108 AM |
9771 | + |
9772 | +/* ---------------------------------------------------------------------- */ | |
9773 | + | |
9774 | +/* no one supports this operation, currently */ | |
9775 | +#if 0 | |
9776 | +static ssize_t aufs_sendpage(struct file *file, struct page *page, int offset, | |
9777 | + size_t len, loff_t *pos , int more) | |
9778 | +{ | |
9779 | +} | |
9780 | +#endif | |
9781 | + | |
9782 | +/* ---------------------------------------------------------------------- */ | |
9783 | + | |
9784 | +const struct file_operations aufs_file_fop = { | |
9785 | + .owner = THIS_MODULE, | |
9786 | + /* | |
9787 | + * while generic_file_llseek/_unlocked() don't use BKL, | |
9788 | + * don't use it since it operates file->f_mapping->host. | |
9789 | + * in aufs, it may be a real file and may confuse users by UDBA. | |
9790 | + */ | |
9791 | + /* .llseek = generic_file_llseek, */ | |
9792 | + | |
9793 | + .read = aufs_read, | |
9794 | + .write = aufs_write, | |
9795 | + .aio_read = aufs_aio_read, | |
9796 | + .aio_write = aufs_aio_write, | |
9797 | +#ifdef CONFIG_AUFS_POLL | |
9798 | + .poll = aufs_poll, | |
9799 | +#endif | |
9800 | + .unlocked_ioctl = aufs_ioctl_nondir, | |
b752ccd1 AM |
9801 | +#ifdef CONFIG_COMPAT |
9802 | + .compat_ioctl = aufs_ioctl_nondir, /* same */ | |
9803 | +#endif | |
4a4d8108 AM |
9804 | + .mmap = aufs_mmap, |
9805 | + .open = aufs_open_nondir, | |
9806 | + .flush = aufs_flush_nondir, | |
9807 | + .release = aufs_release_nondir, | |
9808 | + .fsync = aufs_fsync_nondir, | |
9809 | + /* .aio_fsync = aufs_aio_fsync_nondir, */ | |
9810 | + .fasync = aufs_fasync, | |
9811 | + /* .sendpage = aufs_sendpage, */ | |
9812 | + .splice_write = aufs_splice_write, | |
9813 | + .splice_read = aufs_splice_read, | |
9814 | +#if 0 | |
9815 | + .aio_splice_write = aufs_aio_splice_write, | |
9816 | + .aio_splice_read = aufs_aio_splice_read | |
9817 | +#endif | |
9818 | +}; | |
b752ccd1 AM |
9819 | diff -urN /usr/share/empty/fs/aufs/f_op_sp.c linux/fs/aufs/f_op_sp.c |
9820 | --- /usr/share/empty/fs/aufs/f_op_sp.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
9821 | +++ linux/fs/aufs/f_op_sp.c 2010-10-21 09:52:43.090291764 +0200 |
9822 | @@ -0,0 +1,301 @@ | |
1308ab2a | 9823 | +/* |
4a4d8108 | 9824 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1308ab2a | 9825 | + * |
9826 | + * This program, aufs is free software; you can redistribute it and/or modify | |
9827 | + * it under the terms of the GNU General Public License as published by | |
9828 | + * the Free Software Foundation; either version 2 of the License, or | |
9829 | + * (at your option) any later version. | |
9830 | + * | |
9831 | + * This program is distributed in the hope that it will be useful, | |
9832 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9833 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9834 | + * GNU General Public License for more details. | |
9835 | + * | |
9836 | + * You should have received a copy of the GNU General Public License | |
9837 | + * along with this program; if not, write to the Free Software | |
9838 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
9839 | + */ | |
dece6358 | 9840 | + |
1308ab2a | 9841 | +/* |
4a4d8108 AM |
9842 | + * file operations for special files. |
9843 | + * while they exist in aufs virtually, | |
9844 | + * their file I/O is handled out of aufs. | |
1308ab2a | 9845 | + */ |
9846 | + | |
4a4d8108 AM |
9847 | +#include <linux/fs_stack.h> |
9848 | +#include "aufs.h" | |
1308ab2a | 9849 | + |
4a4d8108 AM |
9850 | +static ssize_t aufs_aio_read_sp(struct kiocb *kio, const struct iovec *iov, |
9851 | + unsigned long nv, loff_t pos) | |
dece6358 | 9852 | +{ |
4a4d8108 AM |
9853 | + ssize_t err; |
9854 | + aufs_bindex_t bstart; | |
9855 | + unsigned char wbr; | |
9856 | + struct file *file, *h_file; | |
9857 | + struct super_block *sb; | |
1308ab2a | 9858 | + |
4a4d8108 AM |
9859 | + file = kio->ki_filp; |
9860 | + sb = file->f_dentry->d_sb; | |
9861 | + si_read_lock(sb, AuLock_FLUSH); | |
9862 | + fi_read_lock(file); | |
9863 | + bstart = au_fbstart(file); | |
9864 | + h_file = au_hf_top(file); | |
9865 | + fi_read_unlock(file); | |
9866 | + wbr = !!au_br_writable(au_sbr(sb, bstart)->br_perm); | |
9867 | + si_read_unlock(sb); | |
9868 | + | |
9869 | + /* do not change the file in kio */ | |
9870 | + AuDebugOn(!h_file->f_op || !h_file->f_op->aio_read); | |
9871 | + err = h_file->f_op->aio_read(kio, iov, nv, pos); | |
9872 | + if (err > 0 && wbr) | |
9873 | + file_accessed(h_file); | |
9874 | + | |
9875 | + return err; | |
9876 | +} | |
9877 | + | |
9878 | +static ssize_t aufs_aio_write_sp(struct kiocb *kio, const struct iovec *iov, | |
9879 | + unsigned long nv, loff_t pos) | |
9880 | +{ | |
9881 | + ssize_t err; | |
9882 | + aufs_bindex_t bstart; | |
9883 | + unsigned char wbr; | |
9884 | + struct super_block *sb; | |
9885 | + struct file *file, *h_file; | |
9886 | + | |
9887 | + file = kio->ki_filp; | |
9888 | + sb = file->f_dentry->d_sb; | |
9889 | + si_read_lock(sb, AuLock_FLUSH); | |
9890 | + fi_read_lock(file); | |
9891 | + bstart = au_fbstart(file); | |
9892 | + h_file = au_hf_top(file); | |
9893 | + fi_read_unlock(file); | |
9894 | + wbr = !!au_br_writable(au_sbr(sb, bstart)->br_perm); | |
9895 | + si_read_unlock(sb); | |
9896 | + | |
9897 | + /* do not change the file in kio */ | |
9898 | + AuDebugOn(!h_file->f_op || !h_file->f_op->aio_write); | |
9899 | + err = h_file->f_op->aio_write(kio, iov, nv, pos); | |
9900 | + if (err > 0 && wbr) | |
9901 | + file_update_time(h_file); | |
9902 | + | |
9903 | + return err; | |
9904 | +} | |
9905 | + | |
9906 | +/* ---------------------------------------------------------------------- */ | |
9907 | + | |
9908 | +static int aufs_release_sp(struct inode *inode, struct file *file) | |
9909 | +{ | |
9910 | + int err; | |
9911 | + struct file *h_file; | |
9912 | + | |
9913 | + fi_read_lock(file); | |
9914 | + h_file = au_hf_top(file); | |
9915 | + fi_read_unlock(file); | |
9916 | + /* close this fifo in aufs */ | |
9917 | + err = h_file->f_op->release(inode, file); /* ignore */ | |
9918 | + aufs_release_nondir(inode, file); /* ignore */ | |
9919 | + return err; | |
9920 | +} | |
9921 | + | |
9922 | +/* ---------------------------------------------------------------------- */ | |
9923 | + | |
9924 | +/* currently, support only FIFO */ | |
4f0767ce JR |
9925 | +enum { |
9926 | + AuSp_FIFO, AuSp_FIFO_R, AuSp_FIFO_W, AuSp_FIFO_RW, | |
9927 | + /* AuSp_SOCK, AuSp_CHR, AuSp_BLK, */ | |
9928 | + AuSp_Last | |
9929 | +}; | |
4a4d8108 AM |
9930 | +static int aufs_open_sp(struct inode *inode, struct file *file); |
9931 | +static struct au_sp_fop { | |
9932 | + int done; | |
9933 | + struct file_operations fop; /* not 'const' */ | |
9934 | + spinlock_t spin; | |
9935 | +} au_sp_fop[AuSp_Last] = { | |
9936 | + [AuSp_FIFO] = { | |
9937 | + .fop = { | |
9938 | + .owner = THIS_MODULE, | |
9939 | + .open = aufs_open_sp | |
9940 | + } | |
9941 | + } | |
9942 | +}; | |
9943 | + | |
9944 | +static void au_init_fop_sp(struct file *file) | |
9945 | +{ | |
9946 | + struct au_sp_fop *p; | |
9947 | + int i; | |
9948 | + struct file *h_file; | |
9949 | + | |
9950 | + p = au_sp_fop; | |
9951 | + if (unlikely(!p->done)) { | |
9952 | + /* initialize first time only */ | |
9953 | + static DEFINE_SPINLOCK(spin); | |
9954 | + | |
9955 | + spin_lock(&spin); | |
9956 | + if (!p->done) { | |
9957 | + BUILD_BUG_ON(sizeof(au_sp_fop)/sizeof(*au_sp_fop) | |
9958 | + != AuSp_Last); | |
9959 | + for (i = 0; i < AuSp_Last; i++) | |
9960 | + spin_lock_init(&p[i].spin); | |
9961 | + p->done = 1; | |
9962 | + } | |
9963 | + spin_unlock(&spin); | |
9964 | + } | |
9965 | + | |
9966 | + switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { | |
9967 | + case FMODE_READ: | |
9968 | + i = AuSp_FIFO_R; | |
9969 | + break; | |
9970 | + case FMODE_WRITE: | |
9971 | + i = AuSp_FIFO_W; | |
9972 | + break; | |
9973 | + case FMODE_READ | FMODE_WRITE: | |
9974 | + i = AuSp_FIFO_RW; | |
9975 | + break; | |
9976 | + default: | |
9977 | + BUG(); | |
9978 | + } | |
9979 | + | |
9980 | + p += i; | |
9981 | + if (unlikely(!p->done)) { | |
9982 | + /* initialize first time only */ | |
9983 | + h_file = au_hf_top(file); | |
9984 | + spin_lock(&p->spin); | |
9985 | + if (!p->done) { | |
9986 | + p->fop = *h_file->f_op; | |
9987 | + p->fop.owner = THIS_MODULE; | |
9988 | + if (p->fop.aio_read) | |
9989 | + p->fop.aio_read = aufs_aio_read_sp; | |
9990 | + if (p->fop.aio_write) | |
9991 | + p->fop.aio_write = aufs_aio_write_sp; | |
9992 | + p->fop.release = aufs_release_sp; | |
9993 | + p->done = 1; | |
9994 | + } | |
9995 | + spin_unlock(&p->spin); | |
9996 | + } | |
9997 | + file->f_op = &p->fop; | |
9998 | +} | |
9999 | + | |
10000 | +static int au_cpup_sp(struct dentry *dentry) | |
10001 | +{ | |
10002 | + int err; | |
10003 | + aufs_bindex_t bcpup; | |
10004 | + struct au_pin pin; | |
10005 | + struct au_wr_dir_args wr_dir_args = { | |
10006 | + .force_btgt = -1, | |
10007 | + .flags = 0 | |
10008 | + }; | |
10009 | + | |
10010 | + AuDbg("%.*s\n", AuDLNPair(dentry)); | |
10011 | + | |
10012 | + di_read_unlock(dentry, AuLock_IR); | |
10013 | + di_write_lock_child(dentry); | |
10014 | + err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args); | |
10015 | + if (unlikely(err < 0)) | |
10016 | + goto out; | |
10017 | + bcpup = err; | |
10018 | + err = 0; | |
10019 | + if (bcpup == au_dbstart(dentry)) | |
10020 | + goto out; /* success */ | |
10021 | + | |
10022 | + err = au_pin(&pin, dentry, bcpup, au_opt_udba(dentry->d_sb), | |
10023 | + AuPin_MNT_WRITE); | |
10024 | + if (!err) { | |
10025 | + err = au_sio_cpup_simple(dentry, bcpup, -1, AuCpup_DTIME); | |
10026 | + au_unpin(&pin); | |
10027 | + } | |
10028 | + | |
4f0767ce | 10029 | +out: |
4a4d8108 AM |
10030 | + di_downgrade_lock(dentry, AuLock_IR); |
10031 | + return err; | |
10032 | +} | |
10033 | + | |
10034 | +static int au_do_open_sp(struct file *file, int flags) | |
10035 | +{ | |
10036 | + int err; | |
10037 | + struct dentry *dentry; | |
10038 | + struct super_block *sb; | |
10039 | + struct file *h_file; | |
10040 | + struct inode *h_inode; | |
10041 | + | |
10042 | + dentry = file->f_dentry; | |
10043 | + AuDbg("%.*s\n", AuDLNPair(dentry)); | |
10044 | + | |
10045 | + /* | |
10046 | + * try copying-up. | |
10047 | + * operate on the ro branch is not an error. | |
10048 | + */ | |
10049 | + au_cpup_sp(dentry); /* ignore */ | |
10050 | + | |
10051 | + /* prepare h_file */ | |
10052 | + err = au_do_open_nondir(file, vfsub_file_flags(file)); | |
10053 | + if (unlikely(err)) | |
10054 | + goto out; | |
10055 | + | |
10056 | + sb = dentry->d_sb; | |
10057 | + h_file = au_hf_top(file); | |
10058 | + h_inode = h_file->f_dentry->d_inode; | |
10059 | + di_read_unlock(dentry, AuLock_IR); | |
10060 | + fi_write_unlock(file); | |
10061 | + si_read_unlock(sb); | |
10062 | + /* open this fifo in aufs */ | |
10063 | + err = h_inode->i_fop->open(file->f_dentry->d_inode, file); | |
10064 | + si_noflush_read_lock(sb); | |
10065 | + fi_write_lock(file); | |
10066 | + di_read_lock_child(dentry, AuLock_IR); | |
10067 | + if (!err) | |
10068 | + au_init_fop_sp(file); | |
953406b4 AM |
10069 | + else |
10070 | + au_finfo_fin(file); | |
4a4d8108 | 10071 | + |
4f0767ce | 10072 | +out: |
4a4d8108 AM |
10073 | + return err; |
10074 | +} | |
10075 | + | |
10076 | +static int aufs_open_sp(struct inode *inode, struct file *file) | |
10077 | +{ | |
10078 | + int err; | |
10079 | + struct super_block *sb; | |
10080 | + | |
10081 | + sb = file->f_dentry->d_sb; | |
10082 | + si_read_lock(sb, AuLock_FLUSH); | |
10083 | + err = au_do_open(file, au_do_open_sp, /*fidir*/NULL); | |
10084 | + si_read_unlock(sb); | |
10085 | + return err; | |
10086 | +} | |
10087 | + | |
10088 | +/* ---------------------------------------------------------------------- */ | |
10089 | + | |
10090 | +void au_init_special_fop(struct inode *inode, umode_t mode, dev_t rdev) | |
10091 | +{ | |
10092 | + init_special_inode(inode, mode, rdev); | |
10093 | + | |
10094 | + switch (mode & S_IFMT) { | |
10095 | + case S_IFIFO: | |
10096 | + inode->i_fop = &au_sp_fop[AuSp_FIFO].fop; | |
10097 | + /*FALLTHROUGH*/ | |
10098 | + case S_IFCHR: | |
10099 | + case S_IFBLK: | |
10100 | + case S_IFSOCK: | |
10101 | + break; | |
10102 | + default: | |
10103 | + AuDebugOn(1); | |
10104 | + } | |
10105 | +} | |
10106 | + | |
10107 | +int au_special_file(umode_t mode) | |
10108 | +{ | |
10109 | + int ret; | |
10110 | + | |
10111 | + ret = 0; | |
10112 | + switch (mode & S_IFMT) { | |
10113 | + case S_IFIFO: | |
10114 | +#if 0 | |
10115 | + case S_IFCHR: | |
10116 | + case S_IFBLK: | |
10117 | + case S_IFSOCK: | |
10118 | +#endif | |
10119 | + ret = 1; | |
10120 | + } | |
10121 | + | |
10122 | + return ret; | |
10123 | +} | |
b752ccd1 AM |
10124 | diff -urN /usr/share/empty/fs/aufs/fstype.h linux/fs/aufs/fstype.h |
10125 | --- /usr/share/empty/fs/aufs/fstype.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 10126 | +++ linux/fs/aufs/fstype.h 2010-10-21 09:52:43.090291764 +0200 |
4a4d8108 AM |
10127 | @@ -0,0 +1,497 @@ |
10128 | +/* | |
10129 | + * Copyright (C) 2005-2010 Junjiro R. Okajima | |
10130 | + * | |
10131 | + * This program, aufs is free software; you can redistribute it and/or modify | |
10132 | + * it under the terms of the GNU General Public License as published by | |
10133 | + * the Free Software Foundation; either version 2 of the License, or | |
10134 | + * (at your option) any later version. | |
10135 | + * | |
10136 | + * This program is distributed in the hope that it will be useful, | |
10137 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10138 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10139 | + * GNU General Public License for more details. | |
10140 | + * | |
10141 | + * You should have received a copy of the GNU General Public License | |
10142 | + * along with this program; if not, write to the Free Software | |
10143 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
10144 | + */ | |
10145 | + | |
10146 | +/* | |
10147 | + * judging filesystem type | |
10148 | + */ | |
10149 | + | |
10150 | +#ifndef __AUFS_FSTYPE_H__ | |
10151 | +#define __AUFS_FSTYPE_H__ | |
10152 | + | |
10153 | +#ifdef __KERNEL__ | |
10154 | + | |
10155 | +#include <linux/fs.h> | |
10156 | +#include <linux/magic.h> | |
10157 | +#include <linux/romfs_fs.h> | |
10158 | +#include <linux/aufs_type.h> | |
10159 | + | |
10160 | +static inline int au_test_aufs(struct super_block *sb) | |
10161 | +{ | |
10162 | + return sb->s_magic == AUFS_SUPER_MAGIC; | |
10163 | +} | |
10164 | + | |
10165 | +static inline const char *au_sbtype(struct super_block *sb) | |
10166 | +{ | |
10167 | + return sb->s_type->name; | |
10168 | +} | |
1308ab2a | 10169 | + |
10170 | +static inline int au_test_iso9660(struct super_block *sb __maybe_unused) | |
10171 | +{ | |
10172 | +#if defined(CONFIG_ROMFS_FS) || defined(CONFIG_ROMFS_FS_MODULE) | |
10173 | + return sb->s_magic == ROMFS_MAGIC; | |
dece6358 AM |
10174 | +#else |
10175 | + return 0; | |
10176 | +#endif | |
10177 | +} | |
10178 | + | |
1308ab2a | 10179 | +static inline int au_test_romfs(struct super_block *sb __maybe_unused) |
dece6358 | 10180 | +{ |
1308ab2a | 10181 | +#if defined(CONFIG_ISO9660_FS) || defined(CONFIG_ISO9660_FS_MODULE) |
10182 | + return sb->s_magic == ISOFS_SUPER_MAGIC; | |
dece6358 AM |
10183 | +#else |
10184 | + return 0; | |
10185 | +#endif | |
10186 | +} | |
10187 | + | |
1308ab2a | 10188 | +static inline int au_test_cramfs(struct super_block *sb __maybe_unused) |
dece6358 | 10189 | +{ |
1308ab2a | 10190 | +#if defined(CONFIG_CRAMFS) || defined(CONFIG_CRAMFS_MODULE) |
10191 | + return sb->s_magic == CRAMFS_MAGIC; | |
10192 | +#endif | |
10193 | + return 0; | |
10194 | +} | |
10195 | + | |
10196 | +static inline int au_test_nfs(struct super_block *sb __maybe_unused) | |
10197 | +{ | |
10198 | +#if defined(CONFIG_NFS_FS) || defined(CONFIG_NFS_FS_MODULE) | |
10199 | + return sb->s_magic == NFS_SUPER_MAGIC; | |
dece6358 AM |
10200 | +#else |
10201 | + return 0; | |
10202 | +#endif | |
10203 | +} | |
10204 | + | |
1308ab2a | 10205 | +static inline int au_test_fuse(struct super_block *sb __maybe_unused) |
dece6358 | 10206 | +{ |
1308ab2a | 10207 | +#if defined(CONFIG_FUSE_FS) || defined(CONFIG_FUSE_FS_MODULE) |
10208 | + return sb->s_magic == FUSE_SUPER_MAGIC; | |
dece6358 AM |
10209 | +#else |
10210 | + return 0; | |
10211 | +#endif | |
10212 | +} | |
10213 | + | |
1308ab2a | 10214 | +static inline int au_test_xfs(struct super_block *sb __maybe_unused) |
dece6358 | 10215 | +{ |
1308ab2a | 10216 | +#if defined(CONFIG_XFS_FS) || defined(CONFIG_XFS_FS_MODULE) |
10217 | + return sb->s_magic == XFS_SB_MAGIC; | |
dece6358 AM |
10218 | +#else |
10219 | + return 0; | |
10220 | +#endif | |
10221 | +} | |
10222 | + | |
1308ab2a | 10223 | +static inline int au_test_tmpfs(struct super_block *sb __maybe_unused) |
dece6358 | 10224 | +{ |
1308ab2a | 10225 | +#ifdef CONFIG_TMPFS |
10226 | + return sb->s_magic == TMPFS_MAGIC; | |
10227 | +#else | |
10228 | + return 0; | |
dece6358 | 10229 | +#endif |
dece6358 AM |
10230 | +} |
10231 | + | |
1308ab2a | 10232 | +static inline int au_test_ecryptfs(struct super_block *sb __maybe_unused) |
1facf9fc | 10233 | +{ |
1308ab2a | 10234 | +#if defined(CONFIG_ECRYPT_FS) || defined(CONFIG_ECRYPT_FS_MODULE) |
10235 | + return !strcmp(au_sbtype(sb), "ecryptfs"); | |
10236 | +#else | |
10237 | + return 0; | |
10238 | +#endif | |
1facf9fc | 10239 | +} |
10240 | + | |
1308ab2a | 10241 | +static inline int au_test_smbfs(struct super_block *sb __maybe_unused) |
1facf9fc | 10242 | +{ |
1308ab2a | 10243 | +#if defined(CONFIG_SMB_FS) || defined(CONFIG_SMB_FS_MODULE) |
10244 | + return sb->s_magic == SMB_SUPER_MAGIC; | |
10245 | +#else | |
10246 | + return 0; | |
1facf9fc | 10247 | +#endif |
1facf9fc | 10248 | +} |
10249 | + | |
1308ab2a | 10250 | +static inline int au_test_ocfs2(struct super_block *sb __maybe_unused) |
1facf9fc | 10251 | +{ |
1308ab2a | 10252 | +#if defined(CONFIG_OCFS2_FS) || defined(CONFIG_OCFS2_FS_MODULE) |
10253 | + return sb->s_magic == OCFS2_SUPER_MAGIC; | |
10254 | +#else | |
10255 | + return 0; | |
10256 | +#endif | |
1facf9fc | 10257 | +} |
10258 | + | |
1308ab2a | 10259 | +static inline int au_test_ocfs2_dlmfs(struct super_block *sb __maybe_unused) |
1facf9fc | 10260 | +{ |
1308ab2a | 10261 | +#if defined(CONFIG_OCFS2_FS_O2CB) || defined(CONFIG_OCFS2_FS_O2CB_MODULE) |
10262 | + return sb->s_magic == DLMFS_MAGIC; | |
10263 | +#else | |
10264 | + return 0; | |
10265 | +#endif | |
1facf9fc | 10266 | +} |
10267 | + | |
1308ab2a | 10268 | +static inline int au_test_coda(struct super_block *sb __maybe_unused) |
1facf9fc | 10269 | +{ |
1308ab2a | 10270 | +#if defined(CONFIG_CODA_FS) || defined(CONFIG_CODA_FS_MODULE) |
10271 | + return sb->s_magic == CODA_SUPER_MAGIC; | |
10272 | +#else | |
10273 | + return 0; | |
10274 | +#endif | |
10275 | +} | |
10276 | + | |
10277 | +static inline int au_test_v9fs(struct super_block *sb __maybe_unused) | |
10278 | +{ | |
10279 | +#if defined(CONFIG_9P_FS) || defined(CONFIG_9P_FS_MODULE) | |
10280 | + return sb->s_magic == V9FS_MAGIC; | |
10281 | +#else | |
10282 | + return 0; | |
10283 | +#endif | |
10284 | +} | |
10285 | + | |
10286 | +static inline int au_test_ext4(struct super_block *sb __maybe_unused) | |
10287 | +{ | |
10288 | +#if defined(CONFIG_EXT4DEV_FS) || defined(CONFIG_EXT4DEV_FS_MODULE) | |
10289 | + return sb->s_magic == EXT4_SUPER_MAGIC; | |
10290 | +#else | |
10291 | + return 0; | |
10292 | +#endif | |
10293 | +} | |
10294 | + | |
10295 | +static inline int au_test_sysv(struct super_block *sb __maybe_unused) | |
10296 | +{ | |
10297 | +#if defined(CONFIG_SYSV_FS) || defined(CONFIG_SYSV_FS_MODULE) | |
10298 | + return !strcmp(au_sbtype(sb), "sysv"); | |
10299 | +#else | |
10300 | + return 0; | |
10301 | +#endif | |
10302 | +} | |
10303 | + | |
10304 | +static inline int au_test_ramfs(struct super_block *sb) | |
10305 | +{ | |
10306 | + return sb->s_magic == RAMFS_MAGIC; | |
10307 | +} | |
10308 | + | |
10309 | +static inline int au_test_ubifs(struct super_block *sb __maybe_unused) | |
10310 | +{ | |
10311 | +#if defined(CONFIG_UBIFS_FS) || defined(CONFIG_UBIFS_FS_MODULE) | |
10312 | + return sb->s_magic == UBIFS_SUPER_MAGIC; | |
10313 | +#else | |
10314 | + return 0; | |
10315 | +#endif | |
10316 | +} | |
10317 | + | |
10318 | +static inline int au_test_procfs(struct super_block *sb __maybe_unused) | |
10319 | +{ | |
10320 | +#ifdef CONFIG_PROC_FS | |
10321 | + return sb->s_magic == PROC_SUPER_MAGIC; | |
10322 | +#else | |
10323 | + return 0; | |
10324 | +#endif | |
10325 | +} | |
10326 | + | |
10327 | +static inline int au_test_sysfs(struct super_block *sb __maybe_unused) | |
10328 | +{ | |
10329 | +#ifdef CONFIG_SYSFS | |
10330 | + return sb->s_magic == SYSFS_MAGIC; | |
10331 | +#else | |
10332 | + return 0; | |
10333 | +#endif | |
10334 | +} | |
10335 | + | |
10336 | +static inline int au_test_configfs(struct super_block *sb __maybe_unused) | |
10337 | +{ | |
10338 | +#if defined(CONFIG_CONFIGFS_FS) || defined(CONFIG_CONFIGFS_FS_MODULE) | |
10339 | + return sb->s_magic == CONFIGFS_MAGIC; | |
10340 | +#else | |
10341 | + return 0; | |
10342 | +#endif | |
10343 | +} | |
10344 | + | |
10345 | +static inline int au_test_minix(struct super_block *sb __maybe_unused) | |
10346 | +{ | |
10347 | +#if defined(CONFIG_MINIX_FS) || defined(CONFIG_MINIX_FS_MODULE) | |
10348 | + return sb->s_magic == MINIX3_SUPER_MAGIC | |
10349 | + || sb->s_magic == MINIX2_SUPER_MAGIC | |
10350 | + || sb->s_magic == MINIX2_SUPER_MAGIC2 | |
10351 | + || sb->s_magic == MINIX_SUPER_MAGIC | |
10352 | + || sb->s_magic == MINIX_SUPER_MAGIC2; | |
10353 | +#else | |
10354 | + return 0; | |
10355 | +#endif | |
10356 | +} | |
10357 | + | |
10358 | +static inline int au_test_cifs(struct super_block *sb __maybe_unused) | |
10359 | +{ | |
10360 | +#if defined(CONFIG_CIFS_FS) || defined(CONFIGCIFS_FS_MODULE) | |
10361 | + return sb->s_magic == CIFS_MAGIC_NUMBER; | |
10362 | +#else | |
10363 | + return 0; | |
10364 | +#endif | |
10365 | +} | |
10366 | + | |
10367 | +static inline int au_test_fat(struct super_block *sb __maybe_unused) | |
10368 | +{ | |
10369 | +#if defined(CONFIG_FAT_FS) || defined(CONFIG_FAT_FS_MODULE) | |
10370 | + return sb->s_magic == MSDOS_SUPER_MAGIC; | |
10371 | +#else | |
10372 | + return 0; | |
10373 | +#endif | |
10374 | +} | |
10375 | + | |
10376 | +static inline int au_test_msdos(struct super_block *sb) | |
10377 | +{ | |
10378 | + return au_test_fat(sb); | |
10379 | +} | |
10380 | + | |
10381 | +static inline int au_test_vfat(struct super_block *sb) | |
10382 | +{ | |
10383 | + return au_test_fat(sb); | |
10384 | +} | |
10385 | + | |
10386 | +static inline int au_test_securityfs(struct super_block *sb __maybe_unused) | |
10387 | +{ | |
10388 | +#ifdef CONFIG_SECURITYFS | |
10389 | + return sb->s_magic == SECURITYFS_MAGIC; | |
10390 | +#else | |
10391 | + return 0; | |
10392 | +#endif | |
10393 | +} | |
10394 | + | |
10395 | +static inline int au_test_squashfs(struct super_block *sb __maybe_unused) | |
10396 | +{ | |
10397 | +#if defined(CONFIG_SQUASHFS) || defined(CONFIG_SQUASHFS_MODULE) | |
10398 | + return sb->s_magic == SQUASHFS_MAGIC; | |
10399 | +#else | |
10400 | + return 0; | |
10401 | +#endif | |
10402 | +} | |
10403 | + | |
10404 | +static inline int au_test_btrfs(struct super_block *sb __maybe_unused) | |
10405 | +{ | |
10406 | +#if defined(CONFIG_BTRFS_FS) || defined(CONFIG_BTRFS_FS_MODULE) | |
10407 | + return sb->s_magic == BTRFS_SUPER_MAGIC; | |
10408 | +#else | |
10409 | + return 0; | |
10410 | +#endif | |
10411 | +} | |
10412 | + | |
10413 | +static inline int au_test_xenfs(struct super_block *sb __maybe_unused) | |
10414 | +{ | |
10415 | +#if defined(CONFIG_XENFS) || defined(CONFIG_XENFS_MODULE) | |
10416 | + return sb->s_magic == XENFS_SUPER_MAGIC; | |
10417 | +#else | |
10418 | + return 0; | |
10419 | +#endif | |
10420 | +} | |
10421 | + | |
10422 | +static inline int au_test_debugfs(struct super_block *sb __maybe_unused) | |
10423 | +{ | |
10424 | +#ifdef CONFIG_DEBUG_FS | |
10425 | + return sb->s_magic == DEBUGFS_MAGIC; | |
10426 | +#else | |
10427 | + return 0; | |
10428 | +#endif | |
10429 | +} | |
10430 | + | |
10431 | +static inline int au_test_nilfs(struct super_block *sb __maybe_unused) | |
10432 | +{ | |
10433 | +#if defined(CONFIG_NILFS) || defined(CONFIG_NILFS_MODULE) | |
10434 | + return sb->s_magic == NILFS_SUPER_MAGIC; | |
10435 | +#else | |
10436 | + return 0; | |
10437 | +#endif | |
10438 | +} | |
10439 | + | |
4a4d8108 AM |
10440 | +static inline int au_test_hfsplus(struct super_block *sb __maybe_unused) |
10441 | +{ | |
10442 | +#if defined(CONFIG_HFSPLUS_FS) || defined(CONFIG_HFSPLUS_FS_MODULE) | |
10443 | + return sb->s_magic == HFSPLUS_SUPER_MAGIC; | |
10444 | +#else | |
10445 | + return 0; | |
10446 | +#endif | |
10447 | +} | |
10448 | + | |
1308ab2a | 10449 | +/* ---------------------------------------------------------------------- */ |
10450 | +/* | |
10451 | + * they can't be an aufs branch. | |
10452 | + */ | |
10453 | +static inline int au_test_fs_unsuppoted(struct super_block *sb) | |
10454 | +{ | |
10455 | + return | |
10456 | +#ifndef CONFIG_AUFS_BR_RAMFS | |
10457 | + au_test_ramfs(sb) || | |
10458 | +#endif | |
10459 | + au_test_procfs(sb) | |
10460 | + || au_test_sysfs(sb) | |
10461 | + || au_test_configfs(sb) | |
10462 | + || au_test_debugfs(sb) | |
10463 | + || au_test_securityfs(sb) | |
10464 | + || au_test_xenfs(sb) | |
10465 | + || au_test_ecryptfs(sb) | |
10466 | + /* || !strcmp(au_sbtype(sb), "unionfs") */ | |
10467 | + || au_test_aufs(sb); /* will be supported in next version */ | |
10468 | +} | |
10469 | + | |
10470 | +/* | |
10471 | + * If the filesystem supports NFS-export, then it has to support NULL as | |
10472 | + * a nameidata parameter for ->create(), ->lookup() and ->d_revalidate(). | |
10473 | + * We can apply this principle when we handle a lower filesystem. | |
10474 | + */ | |
10475 | +static inline int au_test_fs_null_nd(struct super_block *sb) | |
10476 | +{ | |
10477 | + return !!sb->s_export_op; | |
10478 | +} | |
10479 | + | |
10480 | +static inline int au_test_fs_remote(struct super_block *sb) | |
10481 | +{ | |
10482 | + return !au_test_tmpfs(sb) | |
10483 | +#ifdef CONFIG_AUFS_BR_RAMFS | |
10484 | + && !au_test_ramfs(sb) | |
10485 | +#endif | |
10486 | + && !(sb->s_type->fs_flags & FS_REQUIRES_DEV); | |
10487 | +} | |
10488 | + | |
10489 | +/* ---------------------------------------------------------------------- */ | |
10490 | + | |
10491 | +/* | |
10492 | + * Note: these functions (below) are created after reading ->getattr() in all | |
10493 | + * filesystems under linux/fs. it means we have to do so in every update... | |
10494 | + */ | |
10495 | + | |
10496 | +/* | |
10497 | + * some filesystems require getattr to refresh the inode attributes before | |
10498 | + * referencing. | |
10499 | + * in most cases, we can rely on the inode attribute in NFS (or every remote fs) | |
10500 | + * and leave the work for d_revalidate() | |
10501 | + */ | |
10502 | +static inline int au_test_fs_refresh_iattr(struct super_block *sb) | |
10503 | +{ | |
10504 | + return au_test_nfs(sb) | |
10505 | + || au_test_fuse(sb) | |
10506 | + /* || au_test_smbfs(sb) */ /* untested */ | |
10507 | + /* || au_test_ocfs2(sb) */ /* untested */ | |
10508 | + /* || au_test_btrfs(sb) */ /* untested */ | |
10509 | + /* || au_test_coda(sb) */ /* untested */ | |
10510 | + /* || au_test_v9fs(sb) */ /* untested */ | |
10511 | + ; | |
10512 | +} | |
10513 | + | |
10514 | +/* | |
10515 | + * filesystems which don't maintain i_size or i_blocks. | |
10516 | + */ | |
10517 | +static inline int au_test_fs_bad_iattr_size(struct super_block *sb) | |
10518 | +{ | |
10519 | + return au_test_xfs(sb) | |
4a4d8108 AM |
10520 | + || au_test_btrfs(sb) |
10521 | + || au_test_ubifs(sb) | |
10522 | + || au_test_hfsplus(sb) /* maintained, but incorrect */ | |
1308ab2a | 10523 | + /* || au_test_ext4(sb) */ /* untested */ |
10524 | + /* || au_test_ocfs2(sb) */ /* untested */ | |
10525 | + /* || au_test_ocfs2_dlmfs(sb) */ /* untested */ | |
10526 | + /* || au_test_sysv(sb) */ /* untested */ | |
1308ab2a | 10527 | + /* || au_test_minix(sb) */ /* untested */ |
10528 | + ; | |
10529 | +} | |
10530 | + | |
10531 | +/* | |
10532 | + * filesystems which don't store the correct value in some of their inode | |
10533 | + * attributes. | |
10534 | + */ | |
10535 | +static inline int au_test_fs_bad_iattr(struct super_block *sb) | |
10536 | +{ | |
10537 | + return au_test_fs_bad_iattr_size(sb) | |
10538 | + /* || au_test_cifs(sb) */ /* untested */ | |
10539 | + || au_test_fat(sb) | |
10540 | + || au_test_msdos(sb) | |
10541 | + || au_test_vfat(sb); | |
1facf9fc | 10542 | +} |
10543 | + | |
10544 | +/* they don't check i_nlink in link(2) */ | |
10545 | +static inline int au_test_fs_no_limit_nlink(struct super_block *sb) | |
10546 | +{ | |
10547 | + return au_test_tmpfs(sb) | |
10548 | +#ifdef CONFIG_AUFS_BR_RAMFS | |
10549 | + || au_test_ramfs(sb) | |
10550 | +#endif | |
4a4d8108 AM |
10551 | + || au_test_ubifs(sb) |
10552 | + || au_test_btrfs(sb) | |
10553 | + || au_test_hfsplus(sb); | |
1facf9fc | 10554 | +} |
10555 | + | |
10556 | +/* | |
10557 | + * filesystems which sets S_NOATIME and S_NOCMTIME. | |
10558 | + */ | |
10559 | +static inline int au_test_fs_notime(struct super_block *sb) | |
10560 | +{ | |
10561 | + return au_test_nfs(sb) | |
10562 | + || au_test_fuse(sb) | |
dece6358 | 10563 | + || au_test_ubifs(sb) |
1facf9fc | 10564 | + /* || au_test_cifs(sb) */ /* untested */ |
1facf9fc | 10565 | + ; |
10566 | +} | |
10567 | + | |
10568 | +/* | |
10569 | + * filesystems which requires replacing i_mapping. | |
10570 | + */ | |
10571 | +static inline int au_test_fs_bad_mapping(struct super_block *sb) | |
10572 | +{ | |
dece6358 AM |
10573 | + return au_test_fuse(sb) |
10574 | + || au_test_ubifs(sb); | |
1facf9fc | 10575 | +} |
10576 | + | |
10577 | +/* temporary support for i#1 in cramfs */ | |
10578 | +static inline int au_test_fs_unique_ino(struct inode *inode) | |
10579 | +{ | |
10580 | + if (au_test_cramfs(inode->i_sb)) | |
10581 | + return inode->i_ino != 1; | |
10582 | + return 1; | |
10583 | +} | |
10584 | + | |
10585 | +/* ---------------------------------------------------------------------- */ | |
10586 | + | |
10587 | +/* | |
10588 | + * the filesystem where the xino files placed must support i/o after unlink and | |
10589 | + * maintain i_size and i_blocks. | |
10590 | + */ | |
10591 | +static inline int au_test_fs_bad_xino(struct super_block *sb) | |
10592 | +{ | |
10593 | + return au_test_fs_remote(sb) | |
10594 | + || au_test_fs_bad_iattr_size(sb) | |
10595 | +#ifdef CONFIG_AUFS_BR_RAMFS | |
10596 | + || !(au_test_ramfs(sb) || au_test_fs_null_nd(sb)) | |
10597 | +#else | |
10598 | + || !au_test_fs_null_nd(sb) /* to keep xino code simple */ | |
10599 | +#endif | |
10600 | + /* don't want unnecessary work for xino */ | |
10601 | + || au_test_aufs(sb) | |
1308ab2a | 10602 | + || au_test_ecryptfs(sb) |
10603 | + || au_test_nilfs(sb); | |
1facf9fc | 10604 | +} |
10605 | + | |
10606 | +static inline int au_test_fs_trunc_xino(struct super_block *sb) | |
10607 | +{ | |
10608 | + return au_test_tmpfs(sb) | |
10609 | + || au_test_ramfs(sb); | |
10610 | +} | |
10611 | + | |
10612 | +/* | |
10613 | + * test if the @sb is real-readonly. | |
10614 | + */ | |
10615 | +static inline int au_test_fs_rr(struct super_block *sb) | |
10616 | +{ | |
10617 | + return au_test_squashfs(sb) | |
10618 | + || au_test_iso9660(sb) | |
10619 | + || au_test_cramfs(sb) | |
10620 | + || au_test_romfs(sb); | |
10621 | +} | |
10622 | + | |
10623 | +#endif /* __KERNEL__ */ | |
10624 | +#endif /* __AUFS_FSTYPE_H__ */ | |
b752ccd1 AM |
10625 | diff -urN /usr/share/empty/fs/aufs/hfsnotify.c linux/fs/aufs/hfsnotify.c |
10626 | --- /usr/share/empty/fs/aufs/hfsnotify.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
10627 | +++ linux/fs/aufs/hfsnotify.c 2010-10-21 09:52:43.090291764 +0200 |
10628 | @@ -0,0 +1,216 @@ | |
1facf9fc | 10629 | +/* |
4a4d8108 | 10630 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 10631 | + * |
10632 | + * This program, aufs is free software; you can redistribute it and/or modify | |
10633 | + * it under the terms of the GNU General Public License as published by | |
10634 | + * the Free Software Foundation; either version 2 of the License, or | |
10635 | + * (at your option) any later version. | |
dece6358 AM |
10636 | + * |
10637 | + * This program is distributed in the hope that it will be useful, | |
10638 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10639 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10640 | + * GNU General Public License for more details. | |
10641 | + * | |
10642 | + * You should have received a copy of the GNU General Public License | |
10643 | + * along with this program; if not, write to the Free Software | |
10644 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 10645 | + */ |
10646 | + | |
10647 | +/* | |
4a4d8108 | 10648 | + * fsnotify for the lower directories |
1facf9fc | 10649 | + */ |
10650 | + | |
10651 | +#include "aufs.h" | |
10652 | + | |
4a4d8108 AM |
10653 | +/* FS_IN_IGNORED is unnecessary */ |
10654 | +static const __u32 AuHfsnMask = (FS_MOVED_TO | FS_MOVED_FROM | FS_DELETE | |
10655 | + | FS_CREATE | FS_EVENT_ON_CHILD); | |
10656 | +static struct fsnotify_group *au_hfsn_group; | |
953406b4 | 10657 | +static DECLARE_WAIT_QUEUE_HEAD(au_hfsn_wq); |
1facf9fc | 10658 | + |
953406b4 | 10659 | +static void au_hfsn_free_mark(struct fsnotify_mark *mark) |
1facf9fc | 10660 | +{ |
953406b4 AM |
10661 | + struct au_hnotify *hn = container_of(mark, struct au_hnotify, |
10662 | + hn_mark); | |
4a4d8108 | 10663 | + AuDbg("here\n"); |
953406b4 AM |
10664 | + hn->hn_mark_dead = 1; |
10665 | + smp_mb(); | |
10666 | + wake_up_all(&au_hfsn_wq); | |
4a4d8108 | 10667 | +} |
1facf9fc | 10668 | + |
4a4d8108 AM |
10669 | +static int au_hfsn_alloc(struct au_hnotify *hn, struct inode *h_inode) |
10670 | +{ | |
953406b4 | 10671 | + struct fsnotify_mark *mark; |
1facf9fc | 10672 | + |
953406b4 AM |
10673 | + hn->hn_mark_dead = 0; |
10674 | + mark = &hn->hn_mark; | |
10675 | + fsnotify_init_mark(mark, au_hfsn_free_mark); | |
10676 | + mark->mask = AuHfsnMask; | |
10677 | + /* | |
10678 | + * by udba rename or rmdir, aufs assign a new inode to the known | |
10679 | + * h_inode, so specify 1 to allow dups. | |
10680 | + */ | |
10681 | + return fsnotify_add_mark(mark, au_hfsn_group, h_inode, /*mnt*/NULL, | |
10682 | + /*allow_dups*/1); | |
1facf9fc | 10683 | +} |
10684 | + | |
4a4d8108 | 10685 | +static void au_hfsn_free(struct au_hnotify *hn) |
1facf9fc | 10686 | +{ |
953406b4 | 10687 | + struct fsnotify_mark *mark; |
1facf9fc | 10688 | + |
953406b4 AM |
10689 | + mark = &hn->hn_mark; |
10690 | + fsnotify_destroy_mark(mark); | |
10691 | + fsnotify_put_mark(mark); | |
10692 | + | |
10693 | + /* TODO: bad approach */ | |
10694 | + wait_event(au_hfsn_wq, hn->hn_mark_dead); | |
1facf9fc | 10695 | +} |
10696 | + | |
10697 | +/* ---------------------------------------------------------------------- */ | |
10698 | + | |
4a4d8108 | 10699 | +static void au_hfsn_ctl(struct au_hinode *hinode, int do_set) |
1facf9fc | 10700 | +{ |
953406b4 | 10701 | + struct fsnotify_mark *mark; |
1facf9fc | 10702 | + |
953406b4 AM |
10703 | + mark = &hinode->hi_notify->hn_mark; |
10704 | + spin_lock(&mark->lock); | |
1facf9fc | 10705 | + if (do_set) { |
953406b4 AM |
10706 | + AuDebugOn(mark->mask & AuHfsnMask); |
10707 | + mark->mask |= AuHfsnMask; | |
1facf9fc | 10708 | + } else { |
953406b4 AM |
10709 | + AuDebugOn(!(mark->mask & AuHfsnMask)); |
10710 | + mark->mask &= ~AuHfsnMask; | |
1facf9fc | 10711 | + } |
953406b4 | 10712 | + spin_unlock(&mark->lock); |
4a4d8108 | 10713 | + /* fsnotify_recalc_inode_mask(hinode->hi_inode); */ |
1facf9fc | 10714 | +} |
10715 | + | |
4a4d8108 | 10716 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 10717 | + |
4a4d8108 AM |
10718 | +/* #define AuDbgHnotify */ |
10719 | +#ifdef AuDbgHnotify | |
10720 | +static char *au_hfsn_name(u32 mask) | |
10721 | +{ | |
10722 | +#ifdef CONFIG_AUFS_DEBUG | |
10723 | +#define test_ret(flag) if (mask & flag) \ | |
10724 | + return #flag; | |
10725 | + test_ret(FS_ACCESS); | |
10726 | + test_ret(FS_MODIFY); | |
10727 | + test_ret(FS_ATTRIB); | |
10728 | + test_ret(FS_CLOSE_WRITE); | |
10729 | + test_ret(FS_CLOSE_NOWRITE); | |
10730 | + test_ret(FS_OPEN); | |
10731 | + test_ret(FS_MOVED_FROM); | |
10732 | + test_ret(FS_MOVED_TO); | |
10733 | + test_ret(FS_CREATE); | |
10734 | + test_ret(FS_DELETE); | |
10735 | + test_ret(FS_DELETE_SELF); | |
10736 | + test_ret(FS_MOVE_SELF); | |
10737 | + test_ret(FS_UNMOUNT); | |
10738 | + test_ret(FS_Q_OVERFLOW); | |
10739 | + test_ret(FS_IN_IGNORED); | |
10740 | + test_ret(FS_IN_ISDIR); | |
10741 | + test_ret(FS_IN_ONESHOT); | |
10742 | + test_ret(FS_EVENT_ON_CHILD); | |
10743 | + return ""; | |
10744 | +#undef test_ret | |
10745 | +#else | |
10746 | + return "??"; | |
10747 | +#endif | |
1facf9fc | 10748 | +} |
4a4d8108 | 10749 | +#endif |
1facf9fc | 10750 | + |
10751 | +/* ---------------------------------------------------------------------- */ | |
10752 | + | |
4a4d8108 | 10753 | +static int au_hfsn_handle_event(struct fsnotify_group *group, |
953406b4 AM |
10754 | + struct fsnotify_mark *inode_mark, |
10755 | + struct fsnotify_mark *vfsmount_mark, | |
4a4d8108 | 10756 | + struct fsnotify_event *event) |
1facf9fc | 10757 | +{ |
10758 | + int err; | |
4a4d8108 AM |
10759 | + struct au_hnotify *hnotify; |
10760 | + struct inode *h_dir, *h_inode; | |
10761 | + __u32 mask; | |
4a4d8108 AM |
10762 | + struct qstr h_child_qstr = { |
10763 | + .name = event->file_name, | |
10764 | + .len = event->name_len | |
10765 | + }; | |
10766 | + | |
10767 | + AuDebugOn(event->data_type != FSNOTIFY_EVENT_INODE); | |
1facf9fc | 10768 | + |
10769 | + err = 0; | |
953406b4 | 10770 | + /* if FS_UNMOUNT happens, there must be another bug */ |
4a4d8108 AM |
10771 | + mask = event->mask; |
10772 | + AuDebugOn(mask & FS_UNMOUNT); | |
953406b4 | 10773 | + if (mask & (FS_IN_IGNORED | FS_UNMOUNT)) |
1facf9fc | 10774 | + goto out; |
1facf9fc | 10775 | + |
4a4d8108 AM |
10776 | + h_dir = event->to_tell; |
10777 | + h_inode = event->inode; | |
10778 | +#ifdef AuDbgHnotify | |
10779 | + au_debug(1); | |
10780 | + if (1 || h_child_qstr.len != sizeof(AUFS_XINO_FNAME) - 1 | |
10781 | + || strncmp(h_child_qstr.name, AUFS_XINO_FNAME, h_child_qstr.len)) { | |
10782 | + AuDbg("i%lu, mask 0x%x %s, hcname %.*s, hi%lu\n", | |
10783 | + h_dir->i_ino, mask, au_hfsn_name(mask), | |
10784 | + AuLNPair(&h_child_qstr), h_inode ? h_inode->i_ino : 0); | |
10785 | + /* WARN_ON(1); */ | |
1facf9fc | 10786 | + } |
4a4d8108 | 10787 | + au_debug(0); |
1facf9fc | 10788 | +#endif |
4a4d8108 | 10789 | + |
953406b4 AM |
10790 | + AuDebugOn(!inode_mark); |
10791 | + hnotify = container_of(inode_mark, struct au_hnotify, hn_mark); | |
10792 | + err = au_hnotify(h_dir, hnotify, mask, &h_child_qstr, h_inode); | |
1facf9fc | 10793 | + |
4a4d8108 AM |
10794 | +out: |
10795 | + return err; | |
10796 | +} | |
1facf9fc | 10797 | + |
4a4d8108 AM |
10798 | +/* copied from linux/fs/notify/inotify/inotify_fsnotiry.c */ |
10799 | +/* it should be exported to modules */ | |
10800 | +static bool au_hfsn_should_send_event(struct fsnotify_group *group, | |
953406b4 AM |
10801 | + struct inode *h_inode, |
10802 | + struct fsnotify_mark *inode_mark, | |
10803 | + struct fsnotify_mark *vfsmount_mark, | |
10804 | + __u32 mask, void *data, int data_type) | |
4a4d8108 | 10805 | +{ |
4a4d8108 | 10806 | + mask = (mask & ~FS_EVENT_ON_CHILD); |
953406b4 | 10807 | + return inode_mark->mask & mask; |
4a4d8108 AM |
10808 | +} |
10809 | + | |
10810 | +static struct fsnotify_ops au_hfsn_ops = { | |
10811 | + .should_send_event = au_hfsn_should_send_event, | |
10812 | + .handle_event = au_hfsn_handle_event | |
10813 | +}; | |
10814 | + | |
10815 | +/* ---------------------------------------------------------------------- */ | |
10816 | + | |
10817 | +static int __init au_hfsn_init(void) | |
10818 | +{ | |
10819 | + int err; | |
1facf9fc | 10820 | + |
4a4d8108 | 10821 | + err = 0; |
953406b4 | 10822 | + au_hfsn_group = fsnotify_alloc_group(&au_hfsn_ops); |
4a4d8108 | 10823 | + if (IS_ERR(au_hfsn_group)) { |
4a4d8108 | 10824 | + err = PTR_ERR(au_hfsn_group); |
953406b4 | 10825 | + pr_err("fsnotify_alloc_group() failed, %d\n", err); |
4a4d8108 | 10826 | + } |
1facf9fc | 10827 | + |
1facf9fc | 10828 | + AuTraceErr(err); |
10829 | + return err; | |
10830 | +} | |
10831 | + | |
4a4d8108 | 10832 | +static void au_hfsn_fin(void) |
1facf9fc | 10833 | +{ |
4a4d8108 AM |
10834 | + fsnotify_put_group(au_hfsn_group); |
10835 | +} | |
1facf9fc | 10836 | + |
4a4d8108 AM |
10837 | +const struct au_hnotify_op au_hnotify_op = { |
10838 | + .ctl = au_hfsn_ctl, | |
10839 | + .alloc = au_hfsn_alloc, | |
10840 | + .free = au_hfsn_free, | |
1facf9fc | 10841 | + |
4a4d8108 AM |
10842 | + .fin = au_hfsn_fin, |
10843 | + .init = au_hfsn_init | |
10844 | +}; | |
b752ccd1 AM |
10845 | diff -urN /usr/share/empty/fs/aufs/hfsplus.c linux/fs/aufs/hfsplus.c |
10846 | --- /usr/share/empty/fs/aufs/hfsplus.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 10847 | +++ linux/fs/aufs/hfsplus.c 2010-10-21 09:52:43.090291764 +0200 |
4a4d8108 AM |
10848 | @@ -0,0 +1,58 @@ |
10849 | +/* | |
10850 | + * Copyright (C) 2010 Junjiro R. Okajima | |
10851 | + * | |
10852 | + * This program, aufs is free software; you can redistribute it and/or modify | |
10853 | + * it under the terms of the GNU General Public License as published by | |
10854 | + * the Free Software Foundation; either version 2 of the License, or | |
10855 | + * (at your option) any later version. | |
10856 | + * | |
10857 | + * This program is distributed in the hope that it will be useful, | |
10858 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10859 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10860 | + * GNU General Public License for more details. | |
10861 | + * | |
10862 | + * You should have received a copy of the GNU General Public License | |
10863 | + * along with this program; if not, write to the Free Software | |
10864 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
10865 | + */ | |
1facf9fc | 10866 | + |
4a4d8108 AM |
10867 | +/* |
10868 | + * special support for filesystems which aqucires an inode mutex | |
10869 | + * at final closing a file, eg, hfsplus. | |
10870 | + * | |
10871 | + * This trick is very simple and stupid, just to open the file before really | |
10872 | + * neceeary open to tell hfsplus that this is not the final closing. | |
10873 | + * The caller should call au_h_open_pre() after acquiring the inode mutex, | |
10874 | + * and au_h_open_post() after releasing it. | |
10875 | + */ | |
1facf9fc | 10876 | + |
4a4d8108 AM |
10877 | +#include <linux/file.h> |
10878 | +#include "aufs.h" | |
1facf9fc | 10879 | + |
4a4d8108 AM |
10880 | +struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex) |
10881 | +{ | |
10882 | + struct file *h_file; | |
10883 | + struct dentry *h_dentry; | |
1facf9fc | 10884 | + |
4a4d8108 AM |
10885 | + h_dentry = au_h_dptr(dentry, bindex); |
10886 | + AuDebugOn(!h_dentry); | |
10887 | + AuDebugOn(!h_dentry->d_inode); | |
10888 | + IMustLock(h_dentry->d_inode); | |
10889 | + | |
10890 | + h_file = NULL; | |
10891 | + if (au_test_hfsplus(h_dentry->d_sb) | |
10892 | + && S_ISREG(h_dentry->d_inode->i_mode)) | |
10893 | + h_file = au_h_open(dentry, bindex, | |
10894 | + O_RDONLY | O_NOATIME | O_LARGEFILE, | |
10895 | + /*file*/NULL); | |
10896 | + return h_file; | |
1facf9fc | 10897 | +} |
10898 | + | |
4a4d8108 AM |
10899 | +void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex, |
10900 | + struct file *h_file) | |
10901 | +{ | |
10902 | + if (h_file) { | |
10903 | + fput(h_file); | |
10904 | + au_sbr_put(dentry->d_sb, bindex); | |
10905 | + } | |
10906 | +} | |
b752ccd1 AM |
10907 | diff -urN /usr/share/empty/fs/aufs/hnotify.c linux/fs/aufs/hnotify.c |
10908 | --- /usr/share/empty/fs/aufs/hnotify.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
10909 | +++ linux/fs/aufs/hnotify.c 2010-10-21 09:52:43.090291764 +0200 |
10910 | @@ -0,0 +1,663 @@ | |
1facf9fc | 10911 | +/* |
4a4d8108 | 10912 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 10913 | + * |
10914 | + * This program, aufs is free software; you can redistribute it and/or modify | |
10915 | + * it under the terms of the GNU General Public License as published by | |
10916 | + * the Free Software Foundation; either version 2 of the License, or | |
10917 | + * (at your option) any later version. | |
dece6358 AM |
10918 | + * |
10919 | + * This program is distributed in the hope that it will be useful, | |
10920 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10921 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10922 | + * GNU General Public License for more details. | |
10923 | + * | |
10924 | + * You should have received a copy of the GNU General Public License | |
10925 | + * along with this program; if not, write to the Free Software | |
10926 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 10927 | + */ |
10928 | + | |
10929 | +/* | |
4a4d8108 | 10930 | + * abstraction to notify the direct changes on lower directories |
1facf9fc | 10931 | + */ |
10932 | + | |
1308ab2a | 10933 | +#include "aufs.h" |
1facf9fc | 10934 | + |
4a4d8108 AM |
10935 | +int au_hn_alloc(struct au_hinode *hinode, struct inode *inode, |
10936 | + struct inode *h_inode) | |
dece6358 | 10937 | +{ |
1308ab2a | 10938 | + int err; |
4a4d8108 | 10939 | + struct au_hnotify *hn; |
1facf9fc | 10940 | + |
4a4d8108 AM |
10941 | + err = -ENOMEM; |
10942 | + hn = au_cache_alloc_hnotify(); | |
10943 | + if (hn) { | |
10944 | + hn->hn_aufs_inode = inode; | |
10945 | + err = au_hnotify_op.alloc(hn, h_inode); | |
10946 | + if (!err) | |
10947 | + hinode->hi_notify = hn; | |
10948 | + else { | |
10949 | + au_cache_free_hnotify(hn); | |
10950 | + /* | |
10951 | + * The upper dir was removed by udba, but the same named | |
10952 | + * dir left. In this case, aufs assignes a new inode | |
10953 | + * number and set the monitor again. | |
10954 | + * For the lower dir, the old monitnor is still left. | |
10955 | + */ | |
10956 | + if (err == -EEXIST) | |
10957 | + err = 0; | |
10958 | + } | |
1308ab2a | 10959 | + } |
1308ab2a | 10960 | + |
1308ab2a | 10961 | + return err; |
dece6358 | 10962 | +} |
1facf9fc | 10963 | + |
4a4d8108 | 10964 | +void au_hn_free(struct au_hinode *hinode) |
dece6358 | 10965 | +{ |
4a4d8108 | 10966 | + struct au_hnotify *hn; |
1facf9fc | 10967 | + |
4a4d8108 AM |
10968 | + hn = hinode->hi_notify; |
10969 | + if (hn) { | |
10970 | + au_hnotify_op.free(hn); | |
10971 | + au_cache_free_hnotify(hn); | |
10972 | + hinode->hi_notify = NULL; | |
10973 | + } | |
10974 | +} | |
dece6358 | 10975 | + |
4a4d8108 | 10976 | +/* ---------------------------------------------------------------------- */ |
dece6358 | 10977 | + |
4a4d8108 AM |
10978 | +void au_hn_ctl(struct au_hinode *hinode, int do_set) |
10979 | +{ | |
10980 | + if (hinode->hi_notify) | |
10981 | + au_hnotify_op.ctl(hinode, do_set); | |
10982 | +} | |
10983 | + | |
10984 | +void au_hn_reset(struct inode *inode, unsigned int flags) | |
10985 | +{ | |
10986 | + aufs_bindex_t bindex, bend; | |
10987 | + struct inode *hi; | |
10988 | + struct dentry *iwhdentry; | |
1facf9fc | 10989 | + |
1308ab2a | 10990 | + bend = au_ibend(inode); |
4a4d8108 AM |
10991 | + for (bindex = au_ibstart(inode); bindex <= bend; bindex++) { |
10992 | + hi = au_h_iptr(inode, bindex); | |
10993 | + if (!hi) | |
10994 | + continue; | |
1308ab2a | 10995 | + |
4a4d8108 AM |
10996 | + /* mutex_lock_nested(&hi->i_mutex, AuLsc_I_CHILD); */ |
10997 | + iwhdentry = au_hi_wh(inode, bindex); | |
10998 | + if (iwhdentry) | |
10999 | + dget(iwhdentry); | |
11000 | + au_igrab(hi); | |
11001 | + au_set_h_iptr(inode, bindex, NULL, 0); | |
11002 | + au_set_h_iptr(inode, bindex, au_igrab(hi), | |
11003 | + flags & ~AuHi_XINO); | |
11004 | + iput(hi); | |
11005 | + dput(iwhdentry); | |
11006 | + /* mutex_unlock(&hi->i_mutex); */ | |
1facf9fc | 11007 | + } |
1facf9fc | 11008 | +} |
11009 | + | |
1308ab2a | 11010 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 11011 | + |
4a4d8108 | 11012 | +static int hn_xino(struct inode *inode, struct inode *h_inode) |
1facf9fc | 11013 | +{ |
4a4d8108 AM |
11014 | + int err; |
11015 | + aufs_bindex_t bindex, bend, bfound, bstart; | |
11016 | + struct inode *h_i; | |
1facf9fc | 11017 | + |
4a4d8108 AM |
11018 | + err = 0; |
11019 | + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { | |
11020 | + pr_warning("branch root dir was changed\n"); | |
11021 | + goto out; | |
11022 | + } | |
1facf9fc | 11023 | + |
4a4d8108 AM |
11024 | + bfound = -1; |
11025 | + bend = au_ibend(inode); | |
11026 | + bstart = au_ibstart(inode); | |
11027 | +#if 0 /* reserved for future use */ | |
11028 | + if (bindex == bend) { | |
11029 | + /* keep this ino in rename case */ | |
11030 | + goto out; | |
11031 | + } | |
11032 | +#endif | |
11033 | + for (bindex = bstart; bindex <= bend; bindex++) | |
11034 | + if (au_h_iptr(inode, bindex) == h_inode) { | |
11035 | + bfound = bindex; | |
11036 | + break; | |
11037 | + } | |
11038 | + if (bfound < 0) | |
1308ab2a | 11039 | + goto out; |
1facf9fc | 11040 | + |
4a4d8108 AM |
11041 | + for (bindex = bstart; bindex <= bend; bindex++) { |
11042 | + h_i = au_h_iptr(inode, bindex); | |
11043 | + if (!h_i) | |
11044 | + continue; | |
1facf9fc | 11045 | + |
4a4d8108 AM |
11046 | + err = au_xino_write(inode->i_sb, bindex, h_i->i_ino, /*ino*/0); |
11047 | + /* ignore this error */ | |
11048 | + /* bad action? */ | |
1facf9fc | 11049 | + } |
1facf9fc | 11050 | + |
4a4d8108 | 11051 | + /* children inode number will be broken */ |
1facf9fc | 11052 | + |
4f0767ce | 11053 | +out: |
4a4d8108 AM |
11054 | + AuTraceErr(err); |
11055 | + return err; | |
1facf9fc | 11056 | +} |
11057 | + | |
4a4d8108 | 11058 | +static int hn_gen_tree(struct dentry *dentry) |
1facf9fc | 11059 | +{ |
4a4d8108 AM |
11060 | + int err, i, j, ndentry; |
11061 | + struct au_dcsub_pages dpages; | |
11062 | + struct au_dpage *dpage; | |
11063 | + struct dentry **dentries; | |
1facf9fc | 11064 | + |
4a4d8108 AM |
11065 | + err = au_dpages_init(&dpages, GFP_NOFS); |
11066 | + if (unlikely(err)) | |
11067 | + goto out; | |
11068 | + err = au_dcsub_pages(&dpages, dentry, NULL, NULL); | |
11069 | + if (unlikely(err)) | |
11070 | + goto out_dpages; | |
1facf9fc | 11071 | + |
4a4d8108 AM |
11072 | + for (i = 0; i < dpages.ndpage; i++) { |
11073 | + dpage = dpages.dpages + i; | |
11074 | + dentries = dpage->dentries; | |
11075 | + ndentry = dpage->ndentry; | |
11076 | + for (j = 0; j < ndentry; j++) { | |
11077 | + struct dentry *d; | |
11078 | + | |
11079 | + d = dentries[j]; | |
11080 | + if (IS_ROOT(d)) | |
11081 | + continue; | |
11082 | + | |
11083 | + d_drop(d); | |
11084 | + au_digen_dec(d); | |
11085 | + if (d->d_inode) | |
11086 | + /* todo: reset children xino? | |
11087 | + cached children only? */ | |
11088 | + au_iigen_dec(d->d_inode); | |
1308ab2a | 11089 | + } |
dece6358 | 11090 | + } |
1facf9fc | 11091 | + |
4f0767ce | 11092 | +out_dpages: |
4a4d8108 | 11093 | + au_dpages_free(&dpages); |
dece6358 | 11094 | + |
4a4d8108 AM |
11095 | + /* discard children */ |
11096 | + dentry_unhash(dentry); | |
11097 | + dput(dentry); | |
4f0767ce | 11098 | +out: |
dece6358 AM |
11099 | + return err; |
11100 | +} | |
11101 | + | |
1308ab2a | 11102 | +/* |
4a4d8108 | 11103 | + * return 0 if processed. |
1308ab2a | 11104 | + */ |
4a4d8108 AM |
11105 | +static int hn_gen_by_inode(char *name, unsigned int nlen, struct inode *inode, |
11106 | + const unsigned int isdir) | |
dece6358 | 11107 | +{ |
1308ab2a | 11108 | + int err; |
4a4d8108 AM |
11109 | + struct dentry *d; |
11110 | + struct qstr *dname; | |
1facf9fc | 11111 | + |
4a4d8108 AM |
11112 | + err = 1; |
11113 | + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { | |
11114 | + pr_warning("branch root dir was changed\n"); | |
11115 | + err = 0; | |
11116 | + goto out; | |
11117 | + } | |
dece6358 | 11118 | + |
4a4d8108 AM |
11119 | + if (!isdir) { |
11120 | + AuDebugOn(!name); | |
11121 | + au_iigen_dec(inode); | |
11122 | + spin_lock(&dcache_lock); | |
11123 | + list_for_each_entry(d, &inode->i_dentry, d_alias) { | |
11124 | + dname = &d->d_name; | |
11125 | + if (dname->len != nlen | |
11126 | + && memcmp(dname->name, name, nlen)) | |
11127 | + continue; | |
11128 | + err = 0; | |
11129 | + spin_lock(&d->d_lock); | |
11130 | + __d_drop(d); | |
11131 | + au_digen_dec(d); | |
11132 | + spin_unlock(&d->d_lock); | |
11133 | + break; | |
1facf9fc | 11134 | + } |
4a4d8108 | 11135 | + spin_unlock(&dcache_lock); |
1308ab2a | 11136 | + } else { |
4a4d8108 AM |
11137 | + au_fset_si(au_sbi(inode->i_sb), FAILED_REFRESH_DIRS); |
11138 | + d = d_find_alias(inode); | |
11139 | + if (!d) { | |
11140 | + au_iigen_dec(inode); | |
11141 | + goto out; | |
11142 | + } | |
1facf9fc | 11143 | + |
4a4d8108 AM |
11144 | + dname = &d->d_name; |
11145 | + if (dname->len == nlen && !memcmp(dname->name, name, nlen)) | |
11146 | + err = hn_gen_tree(d); | |
11147 | + dput(d); | |
11148 | + } | |
1facf9fc | 11149 | + |
4f0767ce | 11150 | +out: |
4a4d8108 | 11151 | + AuTraceErr(err); |
1308ab2a | 11152 | + return err; |
11153 | +} | |
dece6358 | 11154 | + |
4a4d8108 | 11155 | +static int hn_gen_by_name(struct dentry *dentry, const unsigned int isdir) |
1facf9fc | 11156 | +{ |
4a4d8108 AM |
11157 | + int err; |
11158 | + struct inode *inode; | |
1facf9fc | 11159 | + |
4a4d8108 AM |
11160 | + inode = dentry->d_inode; |
11161 | + if (IS_ROOT(dentry) | |
11162 | + /* || (inode && inode->i_ino == AUFS_ROOT_INO) */ | |
11163 | + ) { | |
11164 | + pr_warning("branch root dir was changed\n"); | |
11165 | + return 0; | |
11166 | + } | |
1308ab2a | 11167 | + |
4a4d8108 AM |
11168 | + err = 0; |
11169 | + if (!isdir) { | |
11170 | + d_drop(dentry); | |
11171 | + au_digen_dec(dentry); | |
11172 | + if (inode) | |
11173 | + au_iigen_dec(inode); | |
11174 | + } else { | |
11175 | + au_fset_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIRS); | |
11176 | + if (inode) | |
11177 | + err = hn_gen_tree(dentry); | |
11178 | + } | |
11179 | + | |
11180 | + AuTraceErr(err); | |
11181 | + return err; | |
1facf9fc | 11182 | +} |
11183 | + | |
4a4d8108 | 11184 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 11185 | + |
4a4d8108 AM |
11186 | +/* hnotify job flags */ |
11187 | +#define AuHnJob_XINO0 1 | |
11188 | +#define AuHnJob_GEN (1 << 1) | |
11189 | +#define AuHnJob_DIRENT (1 << 2) | |
11190 | +#define AuHnJob_ISDIR (1 << 3) | |
11191 | +#define AuHnJob_TRYXINO0 (1 << 4) | |
11192 | +#define AuHnJob_MNTPNT (1 << 5) | |
11193 | +#define au_ftest_hnjob(flags, name) ((flags) & AuHnJob_##name) | |
11194 | +#define au_fset_hnjob(flags, name) { (flags) |= AuHnJob_##name; } | |
11195 | +#define au_fclr_hnjob(flags, name) { (flags) &= ~AuHnJob_##name; } | |
1facf9fc | 11196 | + |
4a4d8108 AM |
11197 | +enum { |
11198 | + AuHn_CHILD, | |
11199 | + AuHn_PARENT, | |
11200 | + AuHnLast | |
11201 | +}; | |
1facf9fc | 11202 | + |
4a4d8108 AM |
11203 | +struct au_hnotify_args { |
11204 | + struct inode *h_dir, *dir, *h_child_inode; | |
11205 | + u32 mask; | |
11206 | + unsigned int flags[AuHnLast]; | |
11207 | + unsigned int h_child_nlen; | |
11208 | + char h_child_name[]; | |
11209 | +}; | |
1facf9fc | 11210 | + |
4a4d8108 AM |
11211 | +struct hn_job_args { |
11212 | + unsigned int flags; | |
11213 | + struct inode *inode, *h_inode, *dir, *h_dir; | |
11214 | + struct dentry *dentry; | |
11215 | + char *h_name; | |
11216 | + int h_nlen; | |
11217 | +}; | |
1308ab2a | 11218 | + |
4a4d8108 AM |
11219 | +static int hn_job(struct hn_job_args *a) |
11220 | +{ | |
11221 | + const unsigned int isdir = au_ftest_hnjob(a->flags, ISDIR); | |
1308ab2a | 11222 | + |
4a4d8108 AM |
11223 | + /* reset xino */ |
11224 | + if (au_ftest_hnjob(a->flags, XINO0) && a->inode) | |
11225 | + hn_xino(a->inode, a->h_inode); /* ignore this error */ | |
1308ab2a | 11226 | + |
4a4d8108 AM |
11227 | + if (au_ftest_hnjob(a->flags, TRYXINO0) |
11228 | + && a->inode | |
11229 | + && a->h_inode) { | |
11230 | + mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD); | |
11231 | + if (!a->h_inode->i_nlink) | |
11232 | + hn_xino(a->inode, a->h_inode); /* ignore this error */ | |
11233 | + mutex_unlock(&a->h_inode->i_mutex); | |
1308ab2a | 11234 | + } |
1facf9fc | 11235 | + |
4a4d8108 AM |
11236 | + /* make the generation obsolete */ |
11237 | + if (au_ftest_hnjob(a->flags, GEN)) { | |
11238 | + int err = -1; | |
11239 | + if (a->inode) | |
11240 | + err = hn_gen_by_inode(a->h_name, a->h_nlen, a->inode, | |
11241 | + isdir); | |
11242 | + if (err && a->dentry) | |
11243 | + hn_gen_by_name(a->dentry, isdir); | |
11244 | + /* ignore this error */ | |
1facf9fc | 11245 | + } |
1facf9fc | 11246 | + |
4a4d8108 AM |
11247 | + /* make dir entries obsolete */ |
11248 | + if (au_ftest_hnjob(a->flags, DIRENT) && a->inode) { | |
11249 | + struct au_vdir *vdir; | |
1facf9fc | 11250 | + |
4a4d8108 AM |
11251 | + vdir = au_ivdir(a->inode); |
11252 | + if (vdir) | |
11253 | + vdir->vd_jiffy = 0; | |
11254 | + /* IMustLock(a->inode); */ | |
11255 | + /* a->inode->i_version++; */ | |
11256 | + } | |
1facf9fc | 11257 | + |
4a4d8108 AM |
11258 | + /* can do nothing but warn */ |
11259 | + if (au_ftest_hnjob(a->flags, MNTPNT) | |
11260 | + && a->dentry | |
11261 | + && d_mountpoint(a->dentry)) | |
11262 | + pr_warning("mount-point %.*s is removed or renamed\n", | |
11263 | + AuDLNPair(a->dentry)); | |
1facf9fc | 11264 | + |
4a4d8108 | 11265 | + return 0; |
1308ab2a | 11266 | +} |
1facf9fc | 11267 | + |
1308ab2a | 11268 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 11269 | + |
4a4d8108 AM |
11270 | +static struct dentry *lookup_wlock_by_name(char *name, unsigned int nlen, |
11271 | + struct inode *dir) | |
1308ab2a | 11272 | +{ |
4a4d8108 AM |
11273 | + struct dentry *dentry, *d, *parent; |
11274 | + struct qstr *dname; | |
1308ab2a | 11275 | + |
4a4d8108 AM |
11276 | + parent = d_find_alias(dir); |
11277 | + if (!parent) | |
11278 | + return NULL; | |
1308ab2a | 11279 | + |
4a4d8108 AM |
11280 | + dentry = NULL; |
11281 | + spin_lock(&dcache_lock); | |
11282 | + list_for_each_entry(d, &parent->d_subdirs, d_u.d_child) { | |
11283 | + /* AuDbg("%.*s\n", AuDLNPair(d)); */ | |
11284 | + dname = &d->d_name; | |
11285 | + if (dname->len != nlen || memcmp(dname->name, name, nlen)) | |
11286 | + continue; | |
11287 | + if (!atomic_read(&d->d_count) || !d->d_fsdata) { | |
11288 | + spin_lock(&d->d_lock); | |
11289 | + __d_drop(d); | |
11290 | + spin_unlock(&d->d_lock); | |
11291 | + continue; | |
dece6358 | 11292 | + } |
1facf9fc | 11293 | + |
4a4d8108 AM |
11294 | + dentry = dget(d); |
11295 | + break; | |
1308ab2a | 11296 | + } |
4a4d8108 AM |
11297 | + spin_unlock(&dcache_lock); |
11298 | + dput(parent); | |
1facf9fc | 11299 | + |
4a4d8108 AM |
11300 | + if (dentry) |
11301 | + di_write_lock_child(dentry); | |
1308ab2a | 11302 | + |
4a4d8108 AM |
11303 | + return dentry; |
11304 | +} | |
dece6358 | 11305 | + |
4a4d8108 AM |
11306 | +static struct inode *lookup_wlock_by_ino(struct super_block *sb, |
11307 | + aufs_bindex_t bindex, ino_t h_ino) | |
11308 | +{ | |
11309 | + struct inode *inode; | |
11310 | + ino_t ino; | |
11311 | + int err; | |
11312 | + | |
11313 | + inode = NULL; | |
11314 | + err = au_xino_read(sb, bindex, h_ino, &ino); | |
11315 | + if (!err && ino) | |
11316 | + inode = ilookup(sb, ino); | |
11317 | + if (!inode) | |
11318 | + goto out; | |
11319 | + | |
11320 | + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { | |
11321 | + pr_warning("wrong root branch\n"); | |
11322 | + iput(inode); | |
11323 | + inode = NULL; | |
11324 | + goto out; | |
1308ab2a | 11325 | + } |
11326 | + | |
4a4d8108 | 11327 | + ii_write_lock_child(inode); |
1308ab2a | 11328 | + |
4f0767ce | 11329 | +out: |
4a4d8108 | 11330 | + return inode; |
dece6358 AM |
11331 | +} |
11332 | + | |
4a4d8108 | 11333 | +static void au_hn_bh(void *_args) |
1facf9fc | 11334 | +{ |
4a4d8108 AM |
11335 | + struct au_hnotify_args *a = _args; |
11336 | + struct super_block *sb; | |
11337 | + aufs_bindex_t bindex, bend, bfound; | |
11338 | + unsigned char xino, try_iput; | |
1facf9fc | 11339 | + int err; |
1308ab2a | 11340 | + struct inode *inode; |
4a4d8108 AM |
11341 | + ino_t h_ino; |
11342 | + struct hn_job_args args; | |
11343 | + struct dentry *dentry; | |
11344 | + struct au_sbinfo *sbinfo; | |
1facf9fc | 11345 | + |
4a4d8108 AM |
11346 | + AuDebugOn(!_args); |
11347 | + AuDebugOn(!a->h_dir); | |
11348 | + AuDebugOn(!a->dir); | |
11349 | + AuDebugOn(!a->mask); | |
11350 | + AuDbg("mask 0x%x, i%lu, hi%lu, hci%lu\n", | |
11351 | + a->mask, a->dir->i_ino, a->h_dir->i_ino, | |
11352 | + a->h_child_inode ? a->h_child_inode->i_ino : 0); | |
1facf9fc | 11353 | + |
4a4d8108 AM |
11354 | + inode = NULL; |
11355 | + dentry = NULL; | |
11356 | + /* | |
11357 | + * do not lock a->dir->i_mutex here | |
11358 | + * because of d_revalidate() may cause a deadlock. | |
11359 | + */ | |
11360 | + sb = a->dir->i_sb; | |
11361 | + AuDebugOn(!sb); | |
11362 | + sbinfo = au_sbi(sb); | |
11363 | + AuDebugOn(!sbinfo); | |
953406b4 AM |
11364 | + /* big aufs lock */ |
11365 | + si_noflush_write_lock(sb); | |
1facf9fc | 11366 | + |
4a4d8108 AM |
11367 | + ii_read_lock_parent(a->dir); |
11368 | + bfound = -1; | |
11369 | + bend = au_ibend(a->dir); | |
11370 | + for (bindex = au_ibstart(a->dir); bindex <= bend; bindex++) | |
11371 | + if (au_h_iptr(a->dir, bindex) == a->h_dir) { | |
11372 | + bfound = bindex; | |
11373 | + break; | |
11374 | + } | |
11375 | + ii_read_unlock(a->dir); | |
11376 | + if (unlikely(bfound < 0)) | |
11377 | + goto out; | |
1facf9fc | 11378 | + |
4a4d8108 AM |
11379 | + xino = !!au_opt_test(au_mntflags(sb), XINO); |
11380 | + h_ino = 0; | |
11381 | + if (a->h_child_inode) | |
11382 | + h_ino = a->h_child_inode->i_ino; | |
1facf9fc | 11383 | + |
4a4d8108 AM |
11384 | + if (a->h_child_nlen |
11385 | + && (au_ftest_hnjob(a->flags[AuHn_CHILD], GEN) | |
11386 | + || au_ftest_hnjob(a->flags[AuHn_CHILD], MNTPNT))) | |
11387 | + dentry = lookup_wlock_by_name(a->h_child_name, a->h_child_nlen, | |
11388 | + a->dir); | |
11389 | + try_iput = 0; | |
11390 | + if (dentry) | |
11391 | + inode = dentry->d_inode; | |
11392 | + if (xino && !inode && h_ino | |
11393 | + && (au_ftest_hnjob(a->flags[AuHn_CHILD], XINO0) | |
11394 | + || au_ftest_hnjob(a->flags[AuHn_CHILD], TRYXINO0) | |
11395 | + || au_ftest_hnjob(a->flags[AuHn_CHILD], GEN))) { | |
11396 | + inode = lookup_wlock_by_ino(sb, bfound, h_ino); | |
11397 | + try_iput = 1; | |
11398 | + } | |
1facf9fc | 11399 | + |
4a4d8108 AM |
11400 | + args.flags = a->flags[AuHn_CHILD]; |
11401 | + args.dentry = dentry; | |
11402 | + args.inode = inode; | |
11403 | + args.h_inode = a->h_child_inode; | |
11404 | + args.dir = a->dir; | |
11405 | + args.h_dir = a->h_dir; | |
11406 | + args.h_name = a->h_child_name; | |
11407 | + args.h_nlen = a->h_child_nlen; | |
11408 | + err = hn_job(&args); | |
11409 | + if (dentry) { | |
11410 | + if (dentry->d_fsdata) | |
11411 | + di_write_unlock(dentry); | |
11412 | + dput(dentry); | |
11413 | + } | |
11414 | + if (inode && try_iput) { | |
11415 | + ii_write_unlock(inode); | |
11416 | + iput(inode); | |
11417 | + } | |
1facf9fc | 11418 | + |
4a4d8108 AM |
11419 | + ii_write_lock_parent(a->dir); |
11420 | + args.flags = a->flags[AuHn_PARENT]; | |
11421 | + args.dentry = NULL; | |
11422 | + args.inode = a->dir; | |
11423 | + args.h_inode = a->h_dir; | |
11424 | + args.dir = NULL; | |
11425 | + args.h_dir = NULL; | |
11426 | + args.h_name = NULL; | |
11427 | + args.h_nlen = 0; | |
11428 | + err = hn_job(&args); | |
11429 | + ii_write_unlock(a->dir); | |
1facf9fc | 11430 | + |
4f0767ce | 11431 | +out: |
4a4d8108 AM |
11432 | + au_nwt_done(&sbinfo->si_nowait); |
11433 | + si_write_unlock(sb); | |
1308ab2a | 11434 | + |
4a4d8108 AM |
11435 | + iput(a->h_child_inode); |
11436 | + iput(a->h_dir); | |
11437 | + iput(a->dir); | |
1308ab2a | 11438 | + kfree(a); |
dece6358 | 11439 | +} |
1facf9fc | 11440 | + |
4a4d8108 AM |
11441 | +/* ---------------------------------------------------------------------- */ |
11442 | + | |
11443 | +int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask, | |
11444 | + struct qstr *h_child_qstr, struct inode *h_child_inode) | |
dece6358 | 11445 | +{ |
4a4d8108 AM |
11446 | + int err, len; |
11447 | + unsigned int flags[AuHnLast]; | |
11448 | + unsigned char isdir, isroot, wh; | |
11449 | + struct inode *dir; | |
11450 | + struct au_hnotify_args *args; | |
11451 | + char *p, *h_child_name; | |
dece6358 | 11452 | + |
1308ab2a | 11453 | + err = 0; |
4a4d8108 AM |
11454 | + AuDebugOn(!hnotify || !hnotify->hn_aufs_inode); |
11455 | + dir = igrab(hnotify->hn_aufs_inode); | |
11456 | + if (!dir) | |
11457 | + goto out; | |
1facf9fc | 11458 | + |
4a4d8108 AM |
11459 | + isroot = (dir->i_ino == AUFS_ROOT_INO); |
11460 | + wh = 0; | |
11461 | + h_child_name = (void *)h_child_qstr->name; | |
11462 | + len = h_child_qstr->len; | |
11463 | + if (h_child_name) { | |
11464 | + if (len > AUFS_WH_PFX_LEN | |
11465 | + && !memcmp(h_child_name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { | |
11466 | + h_child_name += AUFS_WH_PFX_LEN; | |
11467 | + len -= AUFS_WH_PFX_LEN; | |
11468 | + wh = 1; | |
11469 | + } | |
1facf9fc | 11470 | + } |
dece6358 | 11471 | + |
4a4d8108 AM |
11472 | + isdir = 0; |
11473 | + if (h_child_inode) | |
11474 | + isdir = !!S_ISDIR(h_child_inode->i_mode); | |
11475 | + flags[AuHn_PARENT] = AuHnJob_ISDIR; | |
11476 | + flags[AuHn_CHILD] = 0; | |
11477 | + if (isdir) | |
11478 | + flags[AuHn_CHILD] = AuHnJob_ISDIR; | |
11479 | + au_fset_hnjob(flags[AuHn_PARENT], DIRENT); | |
11480 | + au_fset_hnjob(flags[AuHn_CHILD], GEN); | |
11481 | + switch (mask & FS_EVENTS_POSS_ON_CHILD) { | |
11482 | + case FS_MOVED_FROM: | |
11483 | + case FS_MOVED_TO: | |
11484 | + au_fset_hnjob(flags[AuHn_CHILD], XINO0); | |
11485 | + au_fset_hnjob(flags[AuHn_CHILD], MNTPNT); | |
11486 | + /*FALLTHROUGH*/ | |
11487 | + case FS_CREATE: | |
11488 | + AuDebugOn(!h_child_name || !h_child_inode); | |
11489 | + break; | |
1facf9fc | 11490 | + |
4a4d8108 AM |
11491 | + case FS_DELETE: |
11492 | + /* | |
11493 | + * aufs never be able to get this child inode. | |
11494 | + * revalidation should be in d_revalidate() | |
11495 | + * by checking i_nlink, i_generation or d_unhashed(). | |
11496 | + */ | |
11497 | + AuDebugOn(!h_child_name); | |
11498 | + au_fset_hnjob(flags[AuHn_CHILD], TRYXINO0); | |
11499 | + au_fset_hnjob(flags[AuHn_CHILD], MNTPNT); | |
11500 | + break; | |
dece6358 | 11501 | + |
4a4d8108 AM |
11502 | + default: |
11503 | + AuDebugOn(1); | |
11504 | + } | |
1308ab2a | 11505 | + |
4a4d8108 AM |
11506 | + if (wh) |
11507 | + h_child_inode = NULL; | |
1308ab2a | 11508 | + |
4a4d8108 AM |
11509 | + err = -ENOMEM; |
11510 | + /* iput() and kfree() will be called in au_hnotify() */ | |
4a4d8108 | 11511 | + args = kmalloc(sizeof(*args) + len + 1, GFP_NOFS); |
4a4d8108 AM |
11512 | + if (unlikely(!args)) { |
11513 | + AuErr1("no memory\n"); | |
11514 | + iput(dir); | |
11515 | + goto out; | |
11516 | + } | |
11517 | + args->flags[AuHn_PARENT] = flags[AuHn_PARENT]; | |
11518 | + args->flags[AuHn_CHILD] = flags[AuHn_CHILD]; | |
11519 | + args->mask = mask; | |
11520 | + args->dir = dir; | |
11521 | + args->h_dir = igrab(h_dir); | |
11522 | + if (h_child_inode) | |
11523 | + h_child_inode = igrab(h_child_inode); /* can be NULL */ | |
11524 | + args->h_child_inode = h_child_inode; | |
11525 | + args->h_child_nlen = len; | |
11526 | + if (len) { | |
11527 | + p = (void *)args; | |
11528 | + p += sizeof(*args); | |
11529 | + memcpy(p, h_child_name, len); | |
11530 | + p[len] = 0; | |
1308ab2a | 11531 | + } |
1308ab2a | 11532 | + |
4a4d8108 | 11533 | + err = au_wkq_nowait(au_hn_bh, args, dir->i_sb); |
4a4d8108 AM |
11534 | + if (unlikely(err)) { |
11535 | + pr_err("wkq %d\n", err); | |
11536 | + iput(args->h_child_inode); | |
11537 | + iput(args->h_dir); | |
11538 | + iput(args->dir); | |
11539 | + kfree(args); | |
1facf9fc | 11540 | + } |
1facf9fc | 11541 | + |
4a4d8108 | 11542 | +out: |
1facf9fc | 11543 | + return err; |
11544 | +} | |
11545 | + | |
4a4d8108 AM |
11546 | +static void au_hn_destroy_cache(void) |
11547 | +{ | |
11548 | + kmem_cache_destroy(au_cachep[AuCache_HNOTIFY]); | |
11549 | + au_cachep[AuCache_HNOTIFY] = NULL; | |
11550 | +} | |
1308ab2a | 11551 | + |
4a4d8108 | 11552 | +int __init au_hnotify_init(void) |
1facf9fc | 11553 | +{ |
1308ab2a | 11554 | + int err; |
1308ab2a | 11555 | + |
4a4d8108 AM |
11556 | + err = -ENOMEM; |
11557 | + au_cachep[AuCache_HNOTIFY] = AuCache(au_hnotify); | |
11558 | + if (au_cachep[AuCache_HNOTIFY]) { | |
11559 | + err = au_hnotify_op.init(); | |
11560 | + if (unlikely(err)) | |
11561 | + au_hn_destroy_cache(); | |
1308ab2a | 11562 | + } |
1308ab2a | 11563 | + AuTraceErr(err); |
4a4d8108 | 11564 | + return err; |
1308ab2a | 11565 | +} |
11566 | + | |
4a4d8108 | 11567 | +void au_hnotify_fin(void) |
1308ab2a | 11568 | +{ |
4a4d8108 AM |
11569 | + au_hnotify_op.fin(); |
11570 | + /* cf. au_cache_fin() */ | |
11571 | + if (au_cachep[AuCache_HNOTIFY]) | |
11572 | + au_hn_destroy_cache(); | |
dece6358 | 11573 | +} |
b752ccd1 AM |
11574 | diff -urN /usr/share/empty/fs/aufs/iinfo.c linux/fs/aufs/iinfo.c |
11575 | --- /usr/share/empty/fs/aufs/iinfo.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
11576 | +++ linux/fs/aufs/iinfo.c 2010-10-21 09:52:43.090291764 +0200 |
11577 | @@ -0,0 +1,257 @@ | |
dece6358 | 11578 | +/* |
4a4d8108 | 11579 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
dece6358 AM |
11580 | + * |
11581 | + * This program, aufs is free software; you can redistribute it and/or modify | |
11582 | + * it under the terms of the GNU General Public License as published by | |
11583 | + * the Free Software Foundation; either version 2 of the License, or | |
11584 | + * (at your option) any later version. | |
11585 | + * | |
11586 | + * This program is distributed in the hope that it will be useful, | |
11587 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11588 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11589 | + * GNU General Public License for more details. | |
11590 | + * | |
11591 | + * You should have received a copy of the GNU General Public License | |
11592 | + * along with this program; if not, write to the Free Software | |
11593 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
11594 | + */ | |
1facf9fc | 11595 | + |
dece6358 | 11596 | +/* |
4a4d8108 | 11597 | + * inode private data |
dece6358 | 11598 | + */ |
1facf9fc | 11599 | + |
1308ab2a | 11600 | +#include "aufs.h" |
1facf9fc | 11601 | + |
4a4d8108 | 11602 | +struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex) |
1308ab2a | 11603 | +{ |
4a4d8108 | 11604 | + struct inode *h_inode; |
1facf9fc | 11605 | + |
4a4d8108 | 11606 | + IiMustAnyLock(inode); |
1facf9fc | 11607 | + |
4a4d8108 AM |
11608 | + h_inode = au_ii(inode)->ii_hinode[0 + bindex].hi_inode; |
11609 | + AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0); | |
11610 | + return h_inode; | |
11611 | +} | |
1facf9fc | 11612 | + |
4a4d8108 AM |
11613 | +/* todo: hard/soft set? */ |
11614 | +void au_hiput(struct au_hinode *hinode) | |
11615 | +{ | |
11616 | + au_hn_free(hinode); | |
11617 | + dput(hinode->hi_whdentry); | |
11618 | + iput(hinode->hi_inode); | |
11619 | +} | |
1facf9fc | 11620 | + |
4a4d8108 AM |
11621 | +unsigned int au_hi_flags(struct inode *inode, int isdir) |
11622 | +{ | |
11623 | + unsigned int flags; | |
11624 | + const unsigned int mnt_flags = au_mntflags(inode->i_sb); | |
1facf9fc | 11625 | + |
4a4d8108 AM |
11626 | + flags = 0; |
11627 | + if (au_opt_test(mnt_flags, XINO)) | |
11628 | + au_fset_hi(flags, XINO); | |
11629 | + if (isdir && au_opt_test(mnt_flags, UDBA_HNOTIFY)) | |
11630 | + au_fset_hi(flags, HNOTIFY); | |
11631 | + return flags; | |
1facf9fc | 11632 | +} |
11633 | + | |
4a4d8108 AM |
11634 | +void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex, |
11635 | + struct inode *h_inode, unsigned int flags) | |
1308ab2a | 11636 | +{ |
4a4d8108 AM |
11637 | + struct au_hinode *hinode; |
11638 | + struct inode *hi; | |
11639 | + struct au_iinfo *iinfo = au_ii(inode); | |
1facf9fc | 11640 | + |
4a4d8108 | 11641 | + IiMustWriteLock(inode); |
dece6358 | 11642 | + |
4a4d8108 AM |
11643 | + hinode = iinfo->ii_hinode + bindex; |
11644 | + hi = hinode->hi_inode; | |
11645 | + AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0); | |
11646 | + | |
11647 | + if (hi) | |
11648 | + au_hiput(hinode); | |
11649 | + hinode->hi_inode = h_inode; | |
11650 | + if (h_inode) { | |
11651 | + int err; | |
11652 | + struct super_block *sb = inode->i_sb; | |
11653 | + struct au_branch *br; | |
11654 | + | |
11655 | + if (bindex == iinfo->ii_bstart) | |
11656 | + au_cpup_igen(inode, h_inode); | |
11657 | + br = au_sbr(sb, bindex); | |
11658 | + hinode->hi_id = br->br_id; | |
11659 | + if (au_ftest_hi(flags, XINO)) { | |
11660 | + err = au_xino_write(sb, bindex, h_inode->i_ino, | |
11661 | + inode->i_ino); | |
11662 | + if (unlikely(err)) | |
11663 | + AuIOErr1("failed au_xino_write() %d\n", err); | |
11664 | + } | |
11665 | + | |
11666 | + if (au_ftest_hi(flags, HNOTIFY) | |
11667 | + && au_br_hnotifyable(br->br_perm)) { | |
11668 | + err = au_hn_alloc(hinode, inode, h_inode); | |
11669 | + if (unlikely(err)) | |
11670 | + AuIOErr1("au_hn_alloc() %d\n", err); | |
1308ab2a | 11671 | + } |
11672 | + } | |
4a4d8108 | 11673 | +} |
dece6358 | 11674 | + |
4a4d8108 AM |
11675 | +void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex, |
11676 | + struct dentry *h_wh) | |
11677 | +{ | |
11678 | + struct au_hinode *hinode; | |
dece6358 | 11679 | + |
4a4d8108 AM |
11680 | + IiMustWriteLock(inode); |
11681 | + | |
11682 | + hinode = au_ii(inode)->ii_hinode + bindex; | |
11683 | + AuDebugOn(hinode->hi_whdentry); | |
11684 | + hinode->hi_whdentry = h_wh; | |
1facf9fc | 11685 | +} |
11686 | + | |
4a4d8108 | 11687 | +void au_update_iigen(struct inode *inode) |
1308ab2a | 11688 | +{ |
4a4d8108 AM |
11689 | + atomic_set(&au_ii(inode)->ii_generation, au_sigen(inode->i_sb)); |
11690 | + /* smp_mb(); */ /* atomic_set */ | |
11691 | +} | |
1facf9fc | 11692 | + |
4a4d8108 AM |
11693 | +/* it may be called at remount time, too */ |
11694 | +void au_update_ibrange(struct inode *inode, int do_put_zero) | |
11695 | +{ | |
11696 | + struct au_iinfo *iinfo; | |
1facf9fc | 11697 | + |
4a4d8108 AM |
11698 | + iinfo = au_ii(inode); |
11699 | + if (!iinfo || iinfo->ii_bstart < 0) | |
11700 | + return; | |
1facf9fc | 11701 | + |
4a4d8108 | 11702 | + IiMustWriteLock(inode); |
1facf9fc | 11703 | + |
4a4d8108 AM |
11704 | + if (do_put_zero) { |
11705 | + aufs_bindex_t bindex; | |
1facf9fc | 11706 | + |
4a4d8108 AM |
11707 | + for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend; |
11708 | + bindex++) { | |
11709 | + struct inode *h_i; | |
1facf9fc | 11710 | + |
4a4d8108 AM |
11711 | + h_i = iinfo->ii_hinode[0 + bindex].hi_inode; |
11712 | + if (h_i && !h_i->i_nlink) | |
11713 | + au_set_h_iptr(inode, bindex, NULL, 0); | |
11714 | + } | |
11715 | + } | |
1308ab2a | 11716 | + |
4a4d8108 AM |
11717 | + iinfo->ii_bstart = -1; |
11718 | + while (++iinfo->ii_bstart <= iinfo->ii_bend) | |
11719 | + if (iinfo->ii_hinode[0 + iinfo->ii_bstart].hi_inode) | |
11720 | + break; | |
11721 | + if (iinfo->ii_bstart > iinfo->ii_bend) { | |
11722 | + iinfo->ii_bstart = -1; | |
11723 | + iinfo->ii_bend = -1; | |
11724 | + return; | |
11725 | + } | |
11726 | + | |
11727 | + iinfo->ii_bend++; | |
11728 | + while (0 <= --iinfo->ii_bend) | |
11729 | + if (iinfo->ii_hinode[0 + iinfo->ii_bend].hi_inode) | |
11730 | + break; | |
11731 | + AuDebugOn(iinfo->ii_bstart > iinfo->ii_bend || iinfo->ii_bend < 0); | |
1308ab2a | 11732 | +} |
1facf9fc | 11733 | + |
dece6358 | 11734 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 11735 | + |
4a4d8108 | 11736 | +void au_icntnr_init_once(void *_c) |
dece6358 | 11737 | +{ |
4a4d8108 AM |
11738 | + struct au_icntnr *c = _c; |
11739 | + struct au_iinfo *iinfo = &c->iinfo; | |
1facf9fc | 11740 | + |
4a4d8108 AM |
11741 | + au_rw_init(&iinfo->ii_rwsem); |
11742 | + inode_init_once(&c->vfs_inode); | |
11743 | +} | |
1facf9fc | 11744 | + |
4a4d8108 AM |
11745 | +int au_iinfo_init(struct inode *inode) |
11746 | +{ | |
11747 | + struct au_iinfo *iinfo; | |
11748 | + struct super_block *sb; | |
11749 | + int nbr, i; | |
1facf9fc | 11750 | + |
4a4d8108 AM |
11751 | + sb = inode->i_sb; |
11752 | + iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo); | |
11753 | + nbr = au_sbend(sb) + 1; | |
11754 | + if (unlikely(nbr <= 0)) | |
11755 | + nbr = 1; | |
11756 | + iinfo->ii_hinode = kcalloc(nbr, sizeof(*iinfo->ii_hinode), GFP_NOFS); | |
11757 | + if (iinfo->ii_hinode) { | |
11758 | + for (i = 0; i < nbr; i++) | |
11759 | + iinfo->ii_hinode[i].hi_id = -1; | |
1facf9fc | 11760 | + |
4a4d8108 AM |
11761 | + atomic_set(&iinfo->ii_generation, au_sigen(sb)); |
11762 | + /* smp_mb(); */ /* atomic_set */ | |
11763 | + iinfo->ii_bstart = -1; | |
11764 | + iinfo->ii_bend = -1; | |
11765 | + iinfo->ii_vdir = NULL; | |
11766 | + return 0; | |
1308ab2a | 11767 | + } |
4a4d8108 AM |
11768 | + return -ENOMEM; |
11769 | +} | |
1facf9fc | 11770 | + |
4a4d8108 AM |
11771 | +int au_ii_realloc(struct au_iinfo *iinfo, int nbr) |
11772 | +{ | |
11773 | + int err, sz; | |
11774 | + struct au_hinode *hip; | |
1facf9fc | 11775 | + |
4a4d8108 AM |
11776 | + AuRwMustWriteLock(&iinfo->ii_rwsem); |
11777 | + | |
11778 | + err = -ENOMEM; | |
11779 | + sz = sizeof(*hip) * (iinfo->ii_bend + 1); | |
11780 | + if (!sz) | |
11781 | + sz = sizeof(*hip); | |
11782 | + hip = au_kzrealloc(iinfo->ii_hinode, sz, sizeof(*hip) * nbr, GFP_NOFS); | |
11783 | + if (hip) { | |
11784 | + iinfo->ii_hinode = hip; | |
11785 | + err = 0; | |
1308ab2a | 11786 | + } |
4a4d8108 | 11787 | + |
1308ab2a | 11788 | + return err; |
1facf9fc | 11789 | +} |
11790 | + | |
4a4d8108 | 11791 | +void au_iinfo_fin(struct inode *inode) |
1facf9fc | 11792 | +{ |
4a4d8108 AM |
11793 | + struct au_iinfo *iinfo; |
11794 | + struct au_hinode *hi; | |
11795 | + struct super_block *sb; | |
b752ccd1 AM |
11796 | + aufs_bindex_t bindex, bend; |
11797 | + const unsigned char unlinked = !inode->i_nlink; | |
1308ab2a | 11798 | + |
4a4d8108 AM |
11799 | + iinfo = au_ii(inode); |
11800 | + /* bad_inode case */ | |
11801 | + if (!iinfo) | |
11802 | + return; | |
1308ab2a | 11803 | + |
b752ccd1 AM |
11804 | + sb = inode->i_sb; |
11805 | + if (si_pid_test(sb)) | |
11806 | + au_xino_delete_inode(inode, unlinked); | |
11807 | + else { | |
11808 | + /* | |
11809 | + * it is safe to hide the dependency between sbinfo and | |
11810 | + * sb->s_umount. | |
11811 | + */ | |
11812 | + lockdep_off(); | |
11813 | + si_noflush_read_lock(sb); | |
11814 | + au_xino_delete_inode(inode, unlinked); | |
11815 | + si_read_unlock(sb); | |
11816 | + lockdep_on(); | |
11817 | + } | |
11818 | + | |
4a4d8108 AM |
11819 | + if (iinfo->ii_vdir) |
11820 | + au_vdir_free(iinfo->ii_vdir); | |
1308ab2a | 11821 | + |
b752ccd1 AM |
11822 | + bindex = iinfo->ii_bstart; |
11823 | + if (bindex >= 0) { | |
11824 | + hi = iinfo->ii_hinode + bindex; | |
4a4d8108 | 11825 | + bend = iinfo->ii_bend; |
b752ccd1 AM |
11826 | + while (bindex++ <= bend) { |
11827 | + if (hi->hi_inode) | |
4a4d8108 | 11828 | + au_hiput(hi); |
4a4d8108 AM |
11829 | + hi++; |
11830 | + } | |
11831 | + } | |
4a4d8108 AM |
11832 | + kfree(iinfo->ii_hinode); |
11833 | + AuRwDestroy(&iinfo->ii_rwsem); | |
dece6358 | 11834 | +} |
b752ccd1 AM |
11835 | diff -urN /usr/share/empty/fs/aufs/inode.c linux/fs/aufs/inode.c |
11836 | --- /usr/share/empty/fs/aufs/inode.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 11837 | +++ linux/fs/aufs/inode.c 2010-10-21 09:52:43.090291764 +0200 |
b752ccd1 | 11838 | @@ -0,0 +1,443 @@ |
4a4d8108 AM |
11839 | +/* |
11840 | + * Copyright (C) 2005-2010 Junjiro R. Okajima | |
11841 | + * | |
11842 | + * This program, aufs is free software; you can redistribute it and/or modify | |
11843 | + * it under the terms of the GNU General Public License as published by | |
11844 | + * the Free Software Foundation; either version 2 of the License, or | |
11845 | + * (at your option) any later version. | |
11846 | + * | |
11847 | + * This program is distributed in the hope that it will be useful, | |
11848 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11849 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11850 | + * GNU General Public License for more details. | |
11851 | + * | |
11852 | + * You should have received a copy of the GNU General Public License | |
11853 | + * along with this program; if not, write to the Free Software | |
11854 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
11855 | + */ | |
1facf9fc | 11856 | + |
4a4d8108 AM |
11857 | +/* |
11858 | + * inode functions | |
11859 | + */ | |
1facf9fc | 11860 | + |
4a4d8108 | 11861 | +#include "aufs.h" |
1308ab2a | 11862 | + |
4a4d8108 AM |
11863 | +struct inode *au_igrab(struct inode *inode) |
11864 | +{ | |
11865 | + if (inode) { | |
11866 | + AuDebugOn(!atomic_read(&inode->i_count)); | |
953406b4 | 11867 | + atomic_inc_return(&inode->i_count); |
1facf9fc | 11868 | + } |
4a4d8108 AM |
11869 | + return inode; |
11870 | +} | |
1facf9fc | 11871 | + |
4a4d8108 AM |
11872 | +static void au_refresh_hinode_attr(struct inode *inode, int do_version) |
11873 | +{ | |
11874 | + au_cpup_attr_all(inode, /*force*/0); | |
11875 | + au_update_iigen(inode); | |
11876 | + if (do_version) | |
11877 | + inode->i_version++; | |
dece6358 | 11878 | +} |
1facf9fc | 11879 | + |
4a4d8108 | 11880 | +int au_refresh_hinode_self(struct inode *inode, int do_attr) |
dece6358 | 11881 | +{ |
4a4d8108 AM |
11882 | + int err, e; |
11883 | + aufs_bindex_t bindex, new_bindex; | |
11884 | + unsigned char update; | |
11885 | + struct au_hinode *p, *q, tmp; | |
1308ab2a | 11886 | + struct super_block *sb; |
4a4d8108 | 11887 | + struct au_iinfo *iinfo; |
1facf9fc | 11888 | + |
4a4d8108 | 11889 | + IiMustWriteLock(inode); |
1facf9fc | 11890 | + |
4a4d8108 AM |
11891 | + update = 0; |
11892 | + sb = inode->i_sb; | |
11893 | + iinfo = au_ii(inode); | |
11894 | + err = au_ii_realloc(iinfo, au_sbend(sb) + 1); | |
11895 | + if (unlikely(err)) | |
1308ab2a | 11896 | + goto out; |
1facf9fc | 11897 | + |
4a4d8108 AM |
11898 | + p = iinfo->ii_hinode + iinfo->ii_bstart; |
11899 | + err = 0; | |
11900 | + for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend; | |
11901 | + bindex++, p++) { | |
11902 | + if (!p->hi_inode) | |
11903 | + continue; | |
1facf9fc | 11904 | + |
4a4d8108 AM |
11905 | + new_bindex = au_br_index(sb, p->hi_id); |
11906 | + if (new_bindex == bindex) | |
11907 | + continue; | |
1facf9fc | 11908 | + |
4a4d8108 AM |
11909 | + if (new_bindex < 0) { |
11910 | + update = 1; | |
11911 | + au_hiput(p); | |
11912 | + p->hi_inode = NULL; | |
11913 | + continue; | |
1308ab2a | 11914 | + } |
4a4d8108 AM |
11915 | + |
11916 | + if (new_bindex < iinfo->ii_bstart) | |
11917 | + iinfo->ii_bstart = new_bindex; | |
11918 | + if (iinfo->ii_bend < new_bindex) | |
11919 | + iinfo->ii_bend = new_bindex; | |
11920 | + /* swap two lower inode, and loop again */ | |
11921 | + q = iinfo->ii_hinode + new_bindex; | |
11922 | + tmp = *q; | |
11923 | + *q = *p; | |
11924 | + *p = tmp; | |
11925 | + if (tmp.hi_inode) { | |
11926 | + bindex--; | |
11927 | + p--; | |
1308ab2a | 11928 | + } |
11929 | + } | |
4a4d8108 AM |
11930 | + au_update_ibrange(inode, /*do_put_zero*/0); |
11931 | + e = au_dy_irefresh(inode); | |
11932 | + if (unlikely(e && !err)) | |
11933 | + err = e; | |
11934 | + if (do_attr) | |
11935 | + au_refresh_hinode_attr(inode, update && S_ISDIR(inode->i_mode)); | |
1facf9fc | 11936 | + |
4f0767ce | 11937 | +out: |
4a4d8108 AM |
11938 | + return err; |
11939 | +} | |
1facf9fc | 11940 | + |
4a4d8108 AM |
11941 | +int au_refresh_hinode(struct inode *inode, struct dentry *dentry) |
11942 | +{ | |
11943 | + int err, e; | |
11944 | + unsigned int flags; | |
11945 | + aufs_bindex_t bindex, bend; | |
11946 | + unsigned char isdir, update; | |
11947 | + struct au_hinode *p; | |
11948 | + struct au_iinfo *iinfo; | |
1facf9fc | 11949 | + |
4a4d8108 AM |
11950 | + err = au_refresh_hinode_self(inode, /*do_attr*/0); |
11951 | + if (unlikely(err)) | |
11952 | + goto out; | |
11953 | + | |
11954 | + update = 0; | |
11955 | + iinfo = au_ii(inode); | |
11956 | + p = iinfo->ii_hinode + iinfo->ii_bstart; | |
11957 | + isdir = S_ISDIR(inode->i_mode); | |
11958 | + flags = au_hi_flags(inode, isdir); | |
11959 | + bend = au_dbend(dentry); | |
11960 | + for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) { | |
11961 | + struct inode *h_i; | |
11962 | + struct dentry *h_d; | |
11963 | + | |
11964 | + h_d = au_h_dptr(dentry, bindex); | |
11965 | + if (!h_d || !h_d->d_inode) | |
11966 | + continue; | |
11967 | + | |
11968 | + if (iinfo->ii_bstart <= bindex && bindex <= iinfo->ii_bend) { | |
11969 | + h_i = au_h_iptr(inode, bindex); | |
11970 | + if (h_i) { | |
11971 | + if (h_i == h_d->d_inode) | |
11972 | + continue; | |
11973 | + err = -EIO; | |
11974 | + break; | |
11975 | + } | |
11976 | + } | |
11977 | + if (bindex < iinfo->ii_bstart) | |
11978 | + iinfo->ii_bstart = bindex; | |
11979 | + if (iinfo->ii_bend < bindex) | |
11980 | + iinfo->ii_bend = bindex; | |
11981 | + au_set_h_iptr(inode, bindex, au_igrab(h_d->d_inode), flags); | |
11982 | + update = 1; | |
1308ab2a | 11983 | + } |
4a4d8108 AM |
11984 | + au_update_ibrange(inode, /*do_put_zero*/0); |
11985 | + e = au_dy_irefresh(inode); | |
11986 | + if (unlikely(e && !err)) | |
11987 | + err = e; | |
11988 | + au_refresh_hinode_attr(inode, update && isdir); | |
11989 | + | |
4f0767ce | 11990 | +out: |
4a4d8108 | 11991 | + AuTraceErr(err); |
1308ab2a | 11992 | + return err; |
dece6358 AM |
11993 | +} |
11994 | + | |
4a4d8108 | 11995 | +static int set_inode(struct inode *inode, struct dentry *dentry) |
dece6358 | 11996 | +{ |
4a4d8108 AM |
11997 | + int err; |
11998 | + unsigned int flags; | |
11999 | + umode_t mode; | |
12000 | + aufs_bindex_t bindex, bstart, btail; | |
12001 | + unsigned char isdir; | |
12002 | + struct dentry *h_dentry; | |
12003 | + struct inode *h_inode; | |
12004 | + struct au_iinfo *iinfo; | |
dece6358 | 12005 | + |
4a4d8108 | 12006 | + IiMustWriteLock(inode); |
dece6358 | 12007 | + |
4a4d8108 AM |
12008 | + err = 0; |
12009 | + isdir = 0; | |
12010 | + bstart = au_dbstart(dentry); | |
12011 | + h_inode = au_h_dptr(dentry, bstart)->d_inode; | |
12012 | + mode = h_inode->i_mode; | |
12013 | + switch (mode & S_IFMT) { | |
12014 | + case S_IFREG: | |
12015 | + btail = au_dbtail(dentry); | |
12016 | + inode->i_op = &aufs_iop; | |
12017 | + inode->i_fop = &aufs_file_fop; | |
12018 | + err = au_dy_iaop(inode, bstart, h_inode); | |
12019 | + if (unlikely(err)) | |
12020 | + goto out; | |
12021 | + break; | |
12022 | + case S_IFDIR: | |
12023 | + isdir = 1; | |
12024 | + btail = au_dbtaildir(dentry); | |
12025 | + inode->i_op = &aufs_dir_iop; | |
12026 | + inode->i_fop = &aufs_dir_fop; | |
12027 | + break; | |
12028 | + case S_IFLNK: | |
12029 | + btail = au_dbtail(dentry); | |
12030 | + inode->i_op = &aufs_symlink_iop; | |
12031 | + break; | |
12032 | + case S_IFBLK: | |
12033 | + case S_IFCHR: | |
12034 | + case S_IFIFO: | |
12035 | + case S_IFSOCK: | |
12036 | + btail = au_dbtail(dentry); | |
12037 | + inode->i_op = &aufs_iop; | |
12038 | + au_init_special_fop(inode, mode, h_inode->i_rdev); | |
12039 | + break; | |
12040 | + default: | |
12041 | + AuIOErr("Unknown file type 0%o\n", mode); | |
12042 | + err = -EIO; | |
1308ab2a | 12043 | + goto out; |
4a4d8108 | 12044 | + } |
dece6358 | 12045 | + |
4a4d8108 AM |
12046 | + /* do not set hnotify for whiteouted dirs (SHWH mode) */ |
12047 | + flags = au_hi_flags(inode, isdir); | |
12048 | + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH) | |
12049 | + && au_ftest_hi(flags, HNOTIFY) | |
12050 | + && dentry->d_name.len > AUFS_WH_PFX_LEN | |
12051 | + && !memcmp(dentry->d_name.name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) | |
12052 | + au_fclr_hi(flags, HNOTIFY); | |
12053 | + iinfo = au_ii(inode); | |
12054 | + iinfo->ii_bstart = bstart; | |
12055 | + iinfo->ii_bend = btail; | |
12056 | + for (bindex = bstart; bindex <= btail; bindex++) { | |
12057 | + h_dentry = au_h_dptr(dentry, bindex); | |
12058 | + if (h_dentry) | |
12059 | + au_set_h_iptr(inode, bindex, | |
12060 | + au_igrab(h_dentry->d_inode), flags); | |
12061 | + } | |
12062 | + au_cpup_attr_all(inode, /*force*/1); | |
dece6358 | 12063 | + |
4f0767ce | 12064 | +out: |
4a4d8108 AM |
12065 | + return err; |
12066 | +} | |
dece6358 | 12067 | + |
4a4d8108 AM |
12068 | +/* successful returns with iinfo write_locked */ |
12069 | +static int reval_inode(struct inode *inode, struct dentry *dentry, int *matched) | |
12070 | +{ | |
12071 | + int err; | |
12072 | + aufs_bindex_t bindex, bend; | |
12073 | + struct inode *h_inode, *h_dinode; | |
dece6358 | 12074 | + |
4a4d8108 | 12075 | + *matched = 0; |
dece6358 | 12076 | + |
4a4d8108 AM |
12077 | + /* |
12078 | + * before this function, if aufs got any iinfo lock, it must be only | |
12079 | + * one, the parent dir. | |
12080 | + * it can happen by UDBA and the obsoleted inode number. | |
12081 | + */ | |
12082 | + err = -EIO; | |
12083 | + if (unlikely(inode->i_ino == parent_ino(dentry))) | |
12084 | + goto out; | |
12085 | + | |
12086 | + err = 0; | |
12087 | + ii_write_lock_new_child(inode); | |
12088 | + h_dinode = au_h_dptr(dentry, au_dbstart(dentry))->d_inode; | |
12089 | + bend = au_ibend(inode); | |
12090 | + for (bindex = au_ibstart(inode); bindex <= bend; bindex++) { | |
12091 | + h_inode = au_h_iptr(inode, bindex); | |
12092 | + if (h_inode && h_inode == h_dinode) { | |
12093 | + *matched = 1; | |
12094 | + err = 0; | |
12095 | + if (au_iigen(inode) != au_digen(dentry)) | |
12096 | + err = au_refresh_hinode(inode, dentry); | |
12097 | + break; | |
1308ab2a | 12098 | + } |
1facf9fc | 12099 | + } |
dece6358 | 12100 | + |
4a4d8108 AM |
12101 | + if (unlikely(err)) |
12102 | + ii_write_unlock(inode); | |
4f0767ce | 12103 | +out: |
1facf9fc | 12104 | + return err; |
12105 | +} | |
1facf9fc | 12106 | + |
4a4d8108 AM |
12107 | +int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, |
12108 | + unsigned int d_type, ino_t *ino) | |
1facf9fc | 12109 | +{ |
4a4d8108 AM |
12110 | + int err; |
12111 | + struct mutex *mtx; | |
1facf9fc | 12112 | + |
b752ccd1 | 12113 | + /* prevent hardlinked inode number from race condition */ |
4a4d8108 | 12114 | + mtx = NULL; |
b752ccd1 | 12115 | + if (d_type != DT_DIR) { |
4a4d8108 AM |
12116 | + mtx = &au_sbr(sb, bindex)->br_xino.xi_nondir_mtx; |
12117 | + mutex_lock(mtx); | |
12118 | + } | |
12119 | + err = au_xino_read(sb, bindex, h_ino, ino); | |
12120 | + if (unlikely(err)) | |
12121 | + goto out; | |
1308ab2a | 12122 | + |
4a4d8108 AM |
12123 | + if (!*ino) { |
12124 | + err = -EIO; | |
12125 | + *ino = au_xino_new_ino(sb); | |
12126 | + if (unlikely(!*ino)) | |
1facf9fc | 12127 | + goto out; |
4a4d8108 AM |
12128 | + err = au_xino_write(sb, bindex, h_ino, *ino); |
12129 | + if (unlikely(err)) | |
1308ab2a | 12130 | + goto out; |
1308ab2a | 12131 | + } |
1facf9fc | 12132 | + |
4f0767ce | 12133 | +out: |
b752ccd1 | 12134 | + if (mtx) |
4a4d8108 | 12135 | + mutex_unlock(mtx); |
1facf9fc | 12136 | + return err; |
12137 | +} | |
12138 | + | |
4a4d8108 AM |
12139 | +/* successful returns with iinfo write_locked */ |
12140 | +/* todo: return with unlocked? */ | |
12141 | +struct inode *au_new_inode(struct dentry *dentry, int must_new) | |
1facf9fc | 12142 | +{ |
b752ccd1 | 12143 | + struct inode *inode, *h_inode; |
4a4d8108 AM |
12144 | + struct dentry *h_dentry; |
12145 | + struct super_block *sb; | |
b752ccd1 | 12146 | + struct mutex *mtx; |
4a4d8108 AM |
12147 | + ino_t h_ino, ino; |
12148 | + int err, match; | |
12149 | + aufs_bindex_t bstart; | |
1facf9fc | 12150 | + |
4a4d8108 AM |
12151 | + sb = dentry->d_sb; |
12152 | + bstart = au_dbstart(dentry); | |
12153 | + h_dentry = au_h_dptr(dentry, bstart); | |
b752ccd1 AM |
12154 | + h_inode = h_dentry->d_inode; |
12155 | + h_ino = h_inode->i_ino; | |
12156 | + | |
12157 | + /* | |
12158 | + * stop 'race'-ing between hardlinks under different | |
12159 | + * parents. | |
12160 | + */ | |
12161 | + mtx = NULL; | |
12162 | + if (!S_ISDIR(h_inode->i_mode)) | |
12163 | + mtx = &au_sbr(sb, bstart)->br_xino.xi_nondir_mtx; | |
12164 | + | |
4f0767ce | 12165 | +new_ino: |
b752ccd1 AM |
12166 | + if (mtx) |
12167 | + mutex_lock(mtx); | |
4a4d8108 AM |
12168 | + err = au_xino_read(sb, bstart, h_ino, &ino); |
12169 | + inode = ERR_PTR(err); | |
12170 | + if (unlikely(err)) | |
12171 | + goto out; | |
b752ccd1 | 12172 | + |
4a4d8108 AM |
12173 | + if (!ino) { |
12174 | + ino = au_xino_new_ino(sb); | |
12175 | + if (unlikely(!ino)) { | |
12176 | + inode = ERR_PTR(-EIO); | |
dece6358 AM |
12177 | + goto out; |
12178 | + } | |
12179 | + } | |
1facf9fc | 12180 | + |
4a4d8108 AM |
12181 | + AuDbg("i%lu\n", (unsigned long)ino); |
12182 | + inode = au_iget_locked(sb, ino); | |
12183 | + err = PTR_ERR(inode); | |
12184 | + if (IS_ERR(inode)) | |
1facf9fc | 12185 | + goto out; |
1facf9fc | 12186 | + |
4a4d8108 AM |
12187 | + AuDbg("%lx, new %d\n", inode->i_state, !!(inode->i_state & I_NEW)); |
12188 | + if (inode->i_state & I_NEW) { | |
12189 | + ii_write_lock_new_child(inode); | |
12190 | + err = set_inode(inode, dentry); | |
12191 | + if (!err) { | |
12192 | + unlock_new_inode(inode); | |
12193 | + goto out; /* success */ | |
12194 | + } | |
1308ab2a | 12195 | + |
4a4d8108 AM |
12196 | + ii_write_unlock(inode); |
12197 | + iget_failed(inode); | |
12198 | + goto out_err; | |
12199 | + } else if (!must_new) { | |
b752ccd1 AM |
12200 | + /* |
12201 | + * horrible race condition between lookup, readdir and copyup | |
12202 | + * (or something). | |
12203 | + */ | |
12204 | + if (mtx) | |
12205 | + mutex_unlock(mtx); | |
4a4d8108 | 12206 | + err = reval_inode(inode, dentry, &match); |
b752ccd1 AM |
12207 | + if (!err) { |
12208 | + mtx = NULL; | |
4a4d8108 | 12209 | + goto out; /* success */ |
b752ccd1 AM |
12210 | + } else if (match) { |
12211 | + mtx = NULL; | |
4a4d8108 | 12212 | + goto out_iput; |
b752ccd1 AM |
12213 | + } else if (mtx) |
12214 | + mutex_lock(mtx); | |
4a4d8108 AM |
12215 | + } |
12216 | + | |
12217 | + if (unlikely(au_test_fs_unique_ino(h_dentry->d_inode))) | |
12218 | + AuWarn1("Warning: Un-notified UDBA or repeatedly renamed dir," | |
12219 | + " b%d, %s, %.*s, hi%lu, i%lu.\n", | |
12220 | + bstart, au_sbtype(h_dentry->d_sb), AuDLNPair(dentry), | |
12221 | + (unsigned long)h_ino, (unsigned long)ino); | |
12222 | + ino = 0; | |
12223 | + err = au_xino_write(sb, bstart, h_ino, /*ino*/0); | |
12224 | + if (!err) { | |
12225 | + iput(inode); | |
b752ccd1 AM |
12226 | + if (mtx) |
12227 | + mutex_unlock(mtx); | |
4a4d8108 AM |
12228 | + goto new_ino; |
12229 | + } | |
1308ab2a | 12230 | + |
4f0767ce | 12231 | +out_iput: |
4a4d8108 | 12232 | + iput(inode); |
4f0767ce | 12233 | +out_err: |
4a4d8108 | 12234 | + inode = ERR_PTR(err); |
4f0767ce | 12235 | +out: |
b752ccd1 AM |
12236 | + if (mtx) |
12237 | + mutex_unlock(mtx); | |
4a4d8108 | 12238 | + return inode; |
1facf9fc | 12239 | +} |
12240 | + | |
4a4d8108 | 12241 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 12242 | + |
4a4d8108 AM |
12243 | +int au_test_ro(struct super_block *sb, aufs_bindex_t bindex, |
12244 | + struct inode *inode) | |
12245 | +{ | |
12246 | + int err; | |
1facf9fc | 12247 | + |
4a4d8108 | 12248 | + err = au_br_rdonly(au_sbr(sb, bindex)); |
1facf9fc | 12249 | + |
4a4d8108 AM |
12250 | + /* pseudo-link after flushed may happen out of bounds */ |
12251 | + if (!err | |
12252 | + && inode | |
12253 | + && au_ibstart(inode) <= bindex | |
12254 | + && bindex <= au_ibend(inode)) { | |
12255 | + /* | |
12256 | + * permission check is unnecessary since vfsub routine | |
12257 | + * will be called later | |
12258 | + */ | |
12259 | + struct inode *hi = au_h_iptr(inode, bindex); | |
12260 | + if (hi) | |
12261 | + err = IS_IMMUTABLE(hi) ? -EROFS : 0; | |
1facf9fc | 12262 | + } |
12263 | + | |
4a4d8108 AM |
12264 | + return err; |
12265 | +} | |
dece6358 | 12266 | + |
4a4d8108 AM |
12267 | +int au_test_h_perm(struct inode *h_inode, int mask) |
12268 | +{ | |
12269 | + if (!current_fsuid()) | |
12270 | + return 0; | |
12271 | + return inode_permission(h_inode, mask); | |
12272 | +} | |
1facf9fc | 12273 | + |
4a4d8108 AM |
12274 | +int au_test_h_perm_sio(struct inode *h_inode, int mask) |
12275 | +{ | |
12276 | + if (au_test_nfs(h_inode->i_sb) | |
12277 | + && (mask & MAY_WRITE) | |
12278 | + && S_ISDIR(h_inode->i_mode)) | |
12279 | + mask |= MAY_READ; /* force permission check */ | |
12280 | + return au_test_h_perm(h_inode, mask); | |
1facf9fc | 12281 | +} |
b752ccd1 AM |
12282 | diff -urN /usr/share/empty/fs/aufs/inode.h linux/fs/aufs/inode.h |
12283 | --- /usr/share/empty/fs/aufs/inode.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
12284 | +++ linux/fs/aufs/inode.h 2010-10-21 09:52:43.090291764 +0200 |
12285 | @@ -0,0 +1,498 @@ | |
4a4d8108 AM |
12286 | +/* |
12287 | + * Copyright (C) 2005-2010 Junjiro R. Okajima | |
12288 | + * | |
12289 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12290 | + * it under the terms of the GNU General Public License as published by | |
12291 | + * the Free Software Foundation; either version 2 of the License, or | |
12292 | + * (at your option) any later version. | |
12293 | + * | |
12294 | + * This program is distributed in the hope that it will be useful, | |
12295 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12296 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12297 | + * GNU General Public License for more details. | |
12298 | + * | |
12299 | + * You should have received a copy of the GNU General Public License | |
12300 | + * along with this program; if not, write to the Free Software | |
12301 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
12302 | + */ | |
1facf9fc | 12303 | + |
1308ab2a | 12304 | +/* |
4a4d8108 | 12305 | + * inode operations |
1308ab2a | 12306 | + */ |
dece6358 | 12307 | + |
4a4d8108 AM |
12308 | +#ifndef __AUFS_INODE_H__ |
12309 | +#define __AUFS_INODE_H__ | |
dece6358 | 12310 | + |
4a4d8108 | 12311 | +#ifdef __KERNEL__ |
1308ab2a | 12312 | + |
4a4d8108 AM |
12313 | +#include <linux/fs.h> |
12314 | +#include <linux/fsnotify.h> | |
12315 | +#include <linux/aufs_type.h> | |
12316 | +#include "rwsem.h" | |
1308ab2a | 12317 | + |
4a4d8108 | 12318 | +struct vfsmount; |
1facf9fc | 12319 | + |
4a4d8108 AM |
12320 | +struct au_hnotify { |
12321 | +#ifdef CONFIG_AUFS_HNOTIFY | |
12322 | +#ifdef CONFIG_AUFS_HFSNOTIFY | |
953406b4 AM |
12323 | + /* never use fsnotify_add_vfsmount_mark() */ |
12324 | + struct fsnotify_mark hn_mark; | |
12325 | + int hn_mark_dead; | |
4a4d8108 AM |
12326 | +#endif |
12327 | + struct inode *hn_aufs_inode; /* no get/put */ | |
12328 | +#endif | |
12329 | +} ____cacheline_aligned_in_smp; | |
1facf9fc | 12330 | + |
4a4d8108 AM |
12331 | +struct au_hinode { |
12332 | + struct inode *hi_inode; | |
12333 | + aufs_bindex_t hi_id; | |
12334 | +#ifdef CONFIG_AUFS_HNOTIFY | |
12335 | + struct au_hnotify *hi_notify; | |
12336 | +#endif | |
dece6358 | 12337 | + |
4a4d8108 AM |
12338 | + /* reference to the copied-up whiteout with get/put */ |
12339 | + struct dentry *hi_whdentry; | |
12340 | +}; | |
dece6358 | 12341 | + |
4a4d8108 AM |
12342 | +struct au_vdir; |
12343 | +struct au_iinfo { | |
12344 | + atomic_t ii_generation; | |
12345 | + struct super_block *ii_hsb1; /* no get/put */ | |
1facf9fc | 12346 | + |
4a4d8108 AM |
12347 | + struct au_rwsem ii_rwsem; |
12348 | + aufs_bindex_t ii_bstart, ii_bend; | |
12349 | + __u32 ii_higen; | |
12350 | + struct au_hinode *ii_hinode; | |
12351 | + struct au_vdir *ii_vdir; | |
12352 | +}; | |
1facf9fc | 12353 | + |
4a4d8108 AM |
12354 | +struct au_icntnr { |
12355 | + struct au_iinfo iinfo; | |
12356 | + struct inode vfs_inode; | |
12357 | +} ____cacheline_aligned_in_smp; | |
1308ab2a | 12358 | + |
4a4d8108 AM |
12359 | +/* au_pin flags */ |
12360 | +#define AuPin_DI_LOCKED 1 | |
12361 | +#define AuPin_MNT_WRITE (1 << 1) | |
12362 | +#define au_ftest_pin(flags, name) ((flags) & AuPin_##name) | |
12363 | +#define au_fset_pin(flags, name) { (flags) |= AuPin_##name; } | |
12364 | +#define au_fclr_pin(flags, name) { (flags) &= ~AuPin_##name; } | |
12365 | + | |
12366 | +struct au_pin { | |
12367 | + /* input */ | |
12368 | + struct dentry *dentry; | |
12369 | + unsigned int udba; | |
12370 | + unsigned char lsc_di, lsc_hi, flags; | |
12371 | + aufs_bindex_t bindex; | |
12372 | + | |
12373 | + /* output */ | |
12374 | + struct dentry *parent; | |
12375 | + struct au_hinode *hdir; | |
12376 | + struct vfsmount *h_mnt; | |
12377 | +}; | |
1facf9fc | 12378 | + |
1308ab2a | 12379 | +/* ---------------------------------------------------------------------- */ |
12380 | + | |
4a4d8108 | 12381 | +static inline struct au_iinfo *au_ii(struct inode *inode) |
1facf9fc | 12382 | +{ |
4a4d8108 | 12383 | + struct au_iinfo *iinfo; |
1facf9fc | 12384 | + |
4a4d8108 AM |
12385 | + iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo); |
12386 | + if (iinfo->ii_hinode) | |
12387 | + return iinfo; | |
12388 | + return NULL; /* debugging bad_inode case */ | |
12389 | +} | |
1facf9fc | 12390 | + |
4a4d8108 | 12391 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 12392 | + |
4a4d8108 AM |
12393 | +/* inode.c */ |
12394 | +struct inode *au_igrab(struct inode *inode); | |
12395 | +int au_refresh_hinode_self(struct inode *inode, int do_attr); | |
12396 | +int au_refresh_hinode(struct inode *inode, struct dentry *dentry); | |
12397 | +int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
12398 | + unsigned int d_type, ino_t *ino); | |
12399 | +struct inode *au_new_inode(struct dentry *dentry, int must_new); | |
12400 | +int au_test_ro(struct super_block *sb, aufs_bindex_t bindex, | |
12401 | + struct inode *inode); | |
12402 | +int au_test_h_perm(struct inode *h_inode, int mask); | |
12403 | +int au_test_h_perm_sio(struct inode *h_inode, int mask); | |
1facf9fc | 12404 | + |
4a4d8108 AM |
12405 | +static inline int au_wh_ino(struct super_block *sb, aufs_bindex_t bindex, |
12406 | + ino_t h_ino, unsigned int d_type, ino_t *ino) | |
12407 | +{ | |
12408 | +#ifdef CONFIG_AUFS_SHWH | |
12409 | + return au_ino(sb, bindex, h_ino, d_type, ino); | |
12410 | +#else | |
12411 | + return 0; | |
12412 | +#endif | |
12413 | +} | |
1facf9fc | 12414 | + |
4a4d8108 AM |
12415 | +/* i_op.c */ |
12416 | +extern struct inode_operations aufs_iop, aufs_symlink_iop, aufs_dir_iop; | |
1308ab2a | 12417 | + |
4a4d8108 AM |
12418 | +/* au_wr_dir flags */ |
12419 | +#define AuWrDir_ADD_ENTRY 1 | |
12420 | +#define AuWrDir_ISDIR (1 << 1) | |
12421 | +#define au_ftest_wrdir(flags, name) ((flags) & AuWrDir_##name) | |
12422 | +#define au_fset_wrdir(flags, name) { (flags) |= AuWrDir_##name; } | |
12423 | +#define au_fclr_wrdir(flags, name) { (flags) &= ~AuWrDir_##name; } | |
1facf9fc | 12424 | + |
4a4d8108 AM |
12425 | +struct au_wr_dir_args { |
12426 | + aufs_bindex_t force_btgt; | |
12427 | + unsigned char flags; | |
12428 | +}; | |
12429 | +int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry, | |
12430 | + struct au_wr_dir_args *args); | |
dece6358 | 12431 | + |
4a4d8108 AM |
12432 | +struct dentry *au_pinned_h_parent(struct au_pin *pin); |
12433 | +void au_pin_init(struct au_pin *pin, struct dentry *dentry, | |
12434 | + aufs_bindex_t bindex, int lsc_di, int lsc_hi, | |
12435 | + unsigned int udba, unsigned char flags); | |
12436 | +int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex, | |
12437 | + unsigned int udba, unsigned char flags) __must_check; | |
12438 | +int au_do_pin(struct au_pin *pin) __must_check; | |
12439 | +void au_unpin(struct au_pin *pin); | |
1facf9fc | 12440 | + |
4a4d8108 AM |
12441 | +/* i_op_add.c */ |
12442 | +int au_may_add(struct dentry *dentry, aufs_bindex_t bindex, | |
12443 | + struct dentry *h_parent, int isdir); | |
12444 | +int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev); | |
12445 | +int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname); | |
12446 | +int aufs_create(struct inode *dir, struct dentry *dentry, int mode, | |
12447 | + struct nameidata *nd); | |
12448 | +int aufs_link(struct dentry *src_dentry, struct inode *dir, | |
12449 | + struct dentry *dentry); | |
12450 | +int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode); | |
1facf9fc | 12451 | + |
4a4d8108 AM |
12452 | +/* i_op_del.c */ |
12453 | +int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup); | |
12454 | +int au_may_del(struct dentry *dentry, aufs_bindex_t bindex, | |
12455 | + struct dentry *h_parent, int isdir); | |
12456 | +int aufs_unlink(struct inode *dir, struct dentry *dentry); | |
12457 | +int aufs_rmdir(struct inode *dir, struct dentry *dentry); | |
1308ab2a | 12458 | + |
4a4d8108 AM |
12459 | +/* i_op_ren.c */ |
12460 | +int au_wbr(struct dentry *dentry, aufs_bindex_t btgt); | |
12461 | +int aufs_rename(struct inode *src_dir, struct dentry *src_dentry, | |
12462 | + struct inode *dir, struct dentry *dentry); | |
1facf9fc | 12463 | + |
4a4d8108 AM |
12464 | +/* iinfo.c */ |
12465 | +struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex); | |
12466 | +void au_hiput(struct au_hinode *hinode); | |
12467 | +void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex, | |
12468 | + struct dentry *h_wh); | |
12469 | +unsigned int au_hi_flags(struct inode *inode, int isdir); | |
1308ab2a | 12470 | + |
4a4d8108 AM |
12471 | +/* hinode flags */ |
12472 | +#define AuHi_XINO 1 | |
12473 | +#define AuHi_HNOTIFY (1 << 1) | |
12474 | +#define au_ftest_hi(flags, name) ((flags) & AuHi_##name) | |
12475 | +#define au_fset_hi(flags, name) { (flags) |= AuHi_##name; } | |
12476 | +#define au_fclr_hi(flags, name) { (flags) &= ~AuHi_##name; } | |
1facf9fc | 12477 | + |
4a4d8108 AM |
12478 | +#ifndef CONFIG_AUFS_HNOTIFY |
12479 | +#undef AuHi_HNOTIFY | |
12480 | +#define AuHi_HNOTIFY 0 | |
12481 | +#endif | |
1facf9fc | 12482 | + |
4a4d8108 AM |
12483 | +void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex, |
12484 | + struct inode *h_inode, unsigned int flags); | |
1facf9fc | 12485 | + |
4a4d8108 AM |
12486 | +void au_update_iigen(struct inode *inode); |
12487 | +void au_update_ibrange(struct inode *inode, int do_put_zero); | |
1facf9fc | 12488 | + |
4a4d8108 AM |
12489 | +void au_icntnr_init_once(void *_c); |
12490 | +int au_iinfo_init(struct inode *inode); | |
12491 | +void au_iinfo_fin(struct inode *inode); | |
12492 | +int au_ii_realloc(struct au_iinfo *iinfo, int nbr); | |
1308ab2a | 12493 | + |
4a4d8108 | 12494 | +/* plink.c */ |
953406b4 AM |
12495 | +void au_plink_maint_block(struct super_block *sb); |
12496 | +void au_plink_maint_leave(struct file *file); | |
4a4d8108 AM |
12497 | +#ifdef CONFIG_AUFS_DEBUG |
12498 | +void au_plink_list(struct super_block *sb); | |
12499 | +#else | |
12500 | +AuStubVoid(au_plink_list, struct super_block *sb) | |
12501 | +#endif | |
12502 | +int au_plink_test(struct inode *inode); | |
12503 | +struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex); | |
12504 | +void au_plink_append(struct inode *inode, aufs_bindex_t bindex, | |
12505 | + struct dentry *h_dentry); | |
953406b4 | 12506 | +void au_plink_put(struct super_block *sb); |
4a4d8108 | 12507 | +void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id); |
953406b4 | 12508 | +long au_plink_ioctl(struct file *file, unsigned int cmd); |
1facf9fc | 12509 | + |
4a4d8108 | 12510 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 12511 | + |
4a4d8108 AM |
12512 | +/* lock subclass for iinfo */ |
12513 | +enum { | |
12514 | + AuLsc_II_CHILD, /* child first */ | |
12515 | + AuLsc_II_CHILD2, /* rename(2), link(2), and cpup at hnotify */ | |
12516 | + AuLsc_II_CHILD3, /* copyup dirs */ | |
12517 | + AuLsc_II_PARENT, /* see AuLsc_I_PARENT in vfsub.h */ | |
12518 | + AuLsc_II_PARENT2, | |
12519 | + AuLsc_II_PARENT3, /* copyup dirs */ | |
12520 | + AuLsc_II_NEW_CHILD | |
12521 | +}; | |
1308ab2a | 12522 | + |
1facf9fc | 12523 | +/* |
4a4d8108 AM |
12524 | + * ii_read_lock_child, ii_write_lock_child, |
12525 | + * ii_read_lock_child2, ii_write_lock_child2, | |
12526 | + * ii_read_lock_child3, ii_write_lock_child3, | |
12527 | + * ii_read_lock_parent, ii_write_lock_parent, | |
12528 | + * ii_read_lock_parent2, ii_write_lock_parent2, | |
12529 | + * ii_read_lock_parent3, ii_write_lock_parent3, | |
12530 | + * ii_read_lock_new_child, ii_write_lock_new_child, | |
1facf9fc | 12531 | + */ |
4a4d8108 AM |
12532 | +#define AuReadLockFunc(name, lsc) \ |
12533 | +static inline void ii_read_lock_##name(struct inode *i) \ | |
12534 | +{ \ | |
12535 | + au_rw_read_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \ | |
12536 | +} | |
12537 | + | |
12538 | +#define AuWriteLockFunc(name, lsc) \ | |
12539 | +static inline void ii_write_lock_##name(struct inode *i) \ | |
12540 | +{ \ | |
12541 | + au_rw_write_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \ | |
12542 | +} | |
12543 | + | |
12544 | +#define AuRWLockFuncs(name, lsc) \ | |
12545 | + AuReadLockFunc(name, lsc) \ | |
12546 | + AuWriteLockFunc(name, lsc) | |
12547 | + | |
12548 | +AuRWLockFuncs(child, CHILD); | |
12549 | +AuRWLockFuncs(child2, CHILD2); | |
12550 | +AuRWLockFuncs(child3, CHILD3); | |
12551 | +AuRWLockFuncs(parent, PARENT); | |
12552 | +AuRWLockFuncs(parent2, PARENT2); | |
12553 | +AuRWLockFuncs(parent3, PARENT3); | |
12554 | +AuRWLockFuncs(new_child, NEW_CHILD); | |
12555 | + | |
12556 | +#undef AuReadLockFunc | |
12557 | +#undef AuWriteLockFunc | |
12558 | +#undef AuRWLockFuncs | |
1facf9fc | 12559 | + |
12560 | +/* | |
4a4d8108 | 12561 | + * ii_read_unlock, ii_write_unlock, ii_downgrade_lock |
1facf9fc | 12562 | + */ |
4a4d8108 | 12563 | +AuSimpleUnlockRwsemFuncs(ii, struct inode *i, &au_ii(i)->ii_rwsem); |
1facf9fc | 12564 | + |
4a4d8108 AM |
12565 | +#define IiMustNoWaiters(i) AuRwMustNoWaiters(&au_ii(i)->ii_rwsem) |
12566 | +#define IiMustAnyLock(i) AuRwMustAnyLock(&au_ii(i)->ii_rwsem) | |
12567 | +#define IiMustWriteLock(i) AuRwMustWriteLock(&au_ii(i)->ii_rwsem) | |
1facf9fc | 12568 | + |
4a4d8108 | 12569 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 12570 | + |
4a4d8108 AM |
12571 | +static inline unsigned int au_iigen(struct inode *inode) |
12572 | +{ | |
12573 | + return atomic_read(&au_ii(inode)->ii_generation); | |
12574 | +} | |
1308ab2a | 12575 | + |
4a4d8108 AM |
12576 | +/* tiny test for inode number */ |
12577 | +/* tmpfs generation is too rough */ | |
12578 | +static inline int au_test_higen(struct inode *inode, struct inode *h_inode) | |
12579 | +{ | |
12580 | + struct au_iinfo *iinfo; | |
1308ab2a | 12581 | + |
4a4d8108 AM |
12582 | + iinfo = au_ii(inode); |
12583 | + AuRwMustAnyLock(&iinfo->ii_rwsem); | |
12584 | + return !(iinfo->ii_hsb1 == h_inode->i_sb | |
12585 | + && iinfo->ii_higen == h_inode->i_generation); | |
12586 | +} | |
1308ab2a | 12587 | + |
4a4d8108 AM |
12588 | +static inline void au_iigen_dec(struct inode *inode) |
12589 | +{ | |
12590 | +#ifdef CONFIG_AUFS_HNOTIFY | |
953406b4 | 12591 | + atomic_dec_return(&au_ii(inode)->ii_generation); |
4a4d8108 AM |
12592 | +#endif |
12593 | +} | |
1308ab2a | 12594 | + |
4a4d8108 | 12595 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 12596 | + |
4a4d8108 AM |
12597 | +static inline aufs_bindex_t au_ii_br_id(struct inode *inode, |
12598 | + aufs_bindex_t bindex) | |
12599 | +{ | |
12600 | + IiMustAnyLock(inode); | |
12601 | + return au_ii(inode)->ii_hinode[0 + bindex].hi_id; | |
12602 | +} | |
1308ab2a | 12603 | + |
4a4d8108 AM |
12604 | +static inline aufs_bindex_t au_ibstart(struct inode *inode) |
12605 | +{ | |
12606 | + IiMustAnyLock(inode); | |
12607 | + return au_ii(inode)->ii_bstart; | |
12608 | +} | |
1308ab2a | 12609 | + |
4a4d8108 AM |
12610 | +static inline aufs_bindex_t au_ibend(struct inode *inode) |
12611 | +{ | |
12612 | + IiMustAnyLock(inode); | |
12613 | + return au_ii(inode)->ii_bend; | |
12614 | +} | |
1308ab2a | 12615 | + |
4a4d8108 AM |
12616 | +static inline struct au_vdir *au_ivdir(struct inode *inode) |
12617 | +{ | |
12618 | + IiMustAnyLock(inode); | |
12619 | + return au_ii(inode)->ii_vdir; | |
12620 | +} | |
1308ab2a | 12621 | + |
4a4d8108 AM |
12622 | +static inline struct dentry *au_hi_wh(struct inode *inode, aufs_bindex_t bindex) |
12623 | +{ | |
12624 | + IiMustAnyLock(inode); | |
12625 | + return au_ii(inode)->ii_hinode[0 + bindex].hi_whdentry; | |
12626 | +} | |
1308ab2a | 12627 | + |
4a4d8108 | 12628 | +static inline void au_set_ibstart(struct inode *inode, aufs_bindex_t bindex) |
1308ab2a | 12629 | +{ |
4a4d8108 AM |
12630 | + IiMustWriteLock(inode); |
12631 | + au_ii(inode)->ii_bstart = bindex; | |
12632 | +} | |
1308ab2a | 12633 | + |
4a4d8108 AM |
12634 | +static inline void au_set_ibend(struct inode *inode, aufs_bindex_t bindex) |
12635 | +{ | |
12636 | + IiMustWriteLock(inode); | |
12637 | + au_ii(inode)->ii_bend = bindex; | |
1308ab2a | 12638 | +} |
12639 | + | |
4a4d8108 AM |
12640 | +static inline void au_set_ivdir(struct inode *inode, struct au_vdir *vdir) |
12641 | +{ | |
12642 | + IiMustWriteLock(inode); | |
12643 | + au_ii(inode)->ii_vdir = vdir; | |
12644 | +} | |
1facf9fc | 12645 | + |
4a4d8108 | 12646 | +static inline struct au_hinode *au_hi(struct inode *inode, aufs_bindex_t bindex) |
1308ab2a | 12647 | +{ |
4a4d8108 AM |
12648 | + IiMustAnyLock(inode); |
12649 | + return au_ii(inode)->ii_hinode + bindex; | |
12650 | +} | |
dece6358 | 12651 | + |
4a4d8108 | 12652 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 12653 | + |
4a4d8108 AM |
12654 | +static inline struct dentry *au_pinned_parent(struct au_pin *pin) |
12655 | +{ | |
12656 | + if (pin) | |
12657 | + return pin->parent; | |
12658 | + return NULL; | |
1facf9fc | 12659 | +} |
12660 | + | |
4a4d8108 | 12661 | +static inline struct inode *au_pinned_h_dir(struct au_pin *pin) |
1facf9fc | 12662 | +{ |
4a4d8108 AM |
12663 | + if (pin && pin->hdir) |
12664 | + return pin->hdir->hi_inode; | |
12665 | + return NULL; | |
1308ab2a | 12666 | +} |
1facf9fc | 12667 | + |
4a4d8108 AM |
12668 | +static inline struct au_hinode *au_pinned_hdir(struct au_pin *pin) |
12669 | +{ | |
12670 | + if (pin) | |
12671 | + return pin->hdir; | |
12672 | + return NULL; | |
12673 | +} | |
1facf9fc | 12674 | + |
4a4d8108 | 12675 | +static inline void au_pin_set_dentry(struct au_pin *pin, struct dentry *dentry) |
1308ab2a | 12676 | +{ |
4a4d8108 AM |
12677 | + if (pin) |
12678 | + pin->dentry = dentry; | |
12679 | +} | |
1308ab2a | 12680 | + |
4a4d8108 AM |
12681 | +static inline void au_pin_set_parent_lflag(struct au_pin *pin, |
12682 | + unsigned char lflag) | |
12683 | +{ | |
12684 | + if (pin) { | |
12685 | + /* dirty macros require brackets */ | |
12686 | + if (lflag) { | |
12687 | + au_fset_pin(pin->flags, DI_LOCKED); | |
12688 | + } else { | |
12689 | + au_fclr_pin(pin->flags, DI_LOCKED); | |
12690 | + } | |
1308ab2a | 12691 | + } |
4a4d8108 AM |
12692 | +} |
12693 | + | |
12694 | +static inline void au_pin_set_parent(struct au_pin *pin, struct dentry *parent) | |
12695 | +{ | |
12696 | + if (pin) { | |
12697 | + dput(pin->parent); | |
12698 | + pin->parent = dget(parent); | |
1facf9fc | 12699 | + } |
4a4d8108 | 12700 | +} |
1facf9fc | 12701 | + |
4a4d8108 AM |
12702 | +/* ---------------------------------------------------------------------- */ |
12703 | + | |
12704 | +#ifdef CONFIG_AUFS_HNOTIFY | |
12705 | +struct au_hnotify_op { | |
12706 | + void (*ctl)(struct au_hinode *hinode, int do_set); | |
12707 | + int (*alloc)(struct au_hnotify *hn, struct inode *h_inode); | |
12708 | + void (*free)(struct au_hnotify *hn); | |
12709 | + | |
12710 | + void (*fin)(void); | |
12711 | + int (*init)(void); | |
12712 | +}; | |
12713 | + | |
12714 | +/* hnotify.c */ | |
12715 | +int au_hn_alloc(struct au_hinode *hinode, struct inode *inode, | |
12716 | + struct inode *h_inode); | |
12717 | +void au_hn_free(struct au_hinode *hinode); | |
12718 | +void au_hn_ctl(struct au_hinode *hinode, int do_set); | |
12719 | +void au_hn_reset(struct inode *inode, unsigned int flags); | |
12720 | +int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask, | |
12721 | + struct qstr *h_child_qstr, struct inode *h_child_inode); | |
12722 | +int __init au_hnotify_init(void); | |
12723 | +void au_hnotify_fin(void); | |
12724 | + | |
953406b4 | 12725 | +/* hfsnotify.c */ |
4a4d8108 AM |
12726 | +extern const struct au_hnotify_op au_hnotify_op; |
12727 | + | |
12728 | +static inline | |
12729 | +void au_hn_init(struct au_hinode *hinode) | |
12730 | +{ | |
12731 | + hinode->hi_notify = NULL; | |
1308ab2a | 12732 | +} |
12733 | + | |
4a4d8108 AM |
12734 | +#else |
12735 | +static inline | |
12736 | +int au_hn_alloc(struct au_hinode *hinode __maybe_unused, | |
12737 | + struct inode *inode __maybe_unused, | |
12738 | + struct inode *h_inode __maybe_unused) | |
1308ab2a | 12739 | +{ |
4a4d8108 AM |
12740 | + return -EOPNOTSUPP; |
12741 | +} | |
1308ab2a | 12742 | + |
4a4d8108 AM |
12743 | +AuStubVoid(au_hn_free, struct au_hinode *hinode __maybe_unused) |
12744 | +AuStubVoid(au_hn_ctl, struct au_hinode *hinode __maybe_unused, | |
12745 | + int do_set __maybe_unused) | |
12746 | +AuStubVoid(au_hn_reset, struct inode *inode __maybe_unused, | |
12747 | + unsigned int flags __maybe_unused) | |
12748 | +AuStubInt0(__init au_hnotify_init, void) | |
12749 | +AuStubVoid(au_hnotify_fin, void) | |
12750 | +AuStubVoid(au_hn_init, struct au_hinode *hinode __maybe_unused) | |
12751 | +#endif /* CONFIG_AUFS_HNOTIFY */ | |
12752 | + | |
12753 | +static inline void au_hn_suspend(struct au_hinode *hdir) | |
12754 | +{ | |
12755 | + au_hn_ctl(hdir, /*do_set*/0); | |
1308ab2a | 12756 | +} |
12757 | + | |
4a4d8108 | 12758 | +static inline void au_hn_resume(struct au_hinode *hdir) |
1308ab2a | 12759 | +{ |
4a4d8108 AM |
12760 | + au_hn_ctl(hdir, /*do_set*/1); |
12761 | +} | |
1308ab2a | 12762 | + |
4a4d8108 AM |
12763 | +static inline void au_hn_imtx_lock(struct au_hinode *hdir) |
12764 | +{ | |
12765 | + mutex_lock(&hdir->hi_inode->i_mutex); | |
12766 | + au_hn_suspend(hdir); | |
12767 | +} | |
dece6358 | 12768 | + |
4a4d8108 AM |
12769 | +static inline void au_hn_imtx_lock_nested(struct au_hinode *hdir, |
12770 | + unsigned int sc __maybe_unused) | |
12771 | +{ | |
12772 | + mutex_lock_nested(&hdir->hi_inode->i_mutex, sc); | |
12773 | + au_hn_suspend(hdir); | |
1facf9fc | 12774 | +} |
1facf9fc | 12775 | + |
4a4d8108 AM |
12776 | +static inline void au_hn_imtx_unlock(struct au_hinode *hdir) |
12777 | +{ | |
12778 | + au_hn_resume(hdir); | |
12779 | + mutex_unlock(&hdir->hi_inode->i_mutex); | |
12780 | +} | |
12781 | + | |
12782 | +#endif /* __KERNEL__ */ | |
12783 | +#endif /* __AUFS_INODE_H__ */ | |
b752ccd1 AM |
12784 | diff -urN /usr/share/empty/fs/aufs/ioctl.c linux/fs/aufs/ioctl.c |
12785 | --- /usr/share/empty/fs/aufs/ioctl.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
12786 | +++ linux/fs/aufs/ioctl.c 2010-10-21 09:52:43.090291764 +0200 |
12787 | @@ -0,0 +1,155 @@ | |
4a4d8108 AM |
12788 | +/* |
12789 | + * Copyright (C) 2005-2010 Junjiro R. Okajima | |
12790 | + * | |
12791 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12792 | + * it under the terms of the GNU General Public License as published by | |
12793 | + * the Free Software Foundation; either version 2 of the License, or | |
12794 | + * (at your option) any later version. | |
12795 | + * | |
12796 | + * This program is distributed in the hope that it will be useful, | |
12797 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12798 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12799 | + * GNU General Public License for more details. | |
12800 | + * | |
12801 | + * You should have received a copy of the GNU General Public License | |
12802 | + * along with this program; if not, write to the Free Software | |
12803 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
12804 | + */ | |
12805 | + | |
12806 | +/* | |
12807 | + * ioctl | |
12808 | + * plink-management and readdir in userspace. | |
12809 | + * assist the pathconf(3) wrapper library. | |
12810 | + */ | |
12811 | + | |
12812 | +#include <linux/file.h> | |
12813 | +#include "aufs.h" | |
12814 | + | |
12815 | +static int au_wbr_fd(struct path *path) | |
12816 | +{ | |
12817 | + int err, fd; | |
12818 | + aufs_bindex_t wbi, bindex, bend; | |
12819 | + struct file *h_file; | |
12820 | + struct super_block *sb; | |
12821 | + struct dentry *root; | |
12822 | + struct au_branch *wbr; | |
12823 | + | |
12824 | + err = get_unused_fd(); | |
12825 | + if (unlikely(err < 0)) | |
12826 | + goto out; | |
12827 | + fd = err; | |
12828 | + | |
12829 | + wbi = 0; | |
12830 | + sb = path->dentry->d_sb; | |
12831 | + root = sb->s_root; | |
12832 | + aufs_read_lock(root, AuLock_IR); | |
12833 | + wbr = au_sbr(sb, wbi); | |
12834 | + if (!(path->mnt->mnt_flags & MNT_READONLY) | |
12835 | + && !au_br_writable(wbr->br_perm)) { | |
12836 | + bend = au_sbend(sb); | |
12837 | + for (bindex = 1; bindex <= bend; bindex++) { | |
12838 | + wbr = au_sbr(sb, bindex); | |
12839 | + if (au_br_writable(wbr->br_perm)) { | |
12840 | + wbi = bindex; | |
12841 | + break; | |
12842 | + } | |
12843 | + } | |
12844 | + wbr = au_sbr(sb, wbi); | |
12845 | + } | |
12846 | + AuDbg("wbi %d\n", wbi); | |
12847 | + h_file = au_h_open(root, wbi, O_RDONLY | O_DIRECTORY | O_LARGEFILE, | |
12848 | + NULL); | |
12849 | + aufs_read_unlock(root, AuLock_IR); | |
12850 | + err = PTR_ERR(h_file); | |
12851 | + if (IS_ERR(h_file)) | |
12852 | + goto out_fd; | |
12853 | + | |
12854 | + atomic_dec(&wbr->br_count); /* cf. au_h_open() */ | |
12855 | + fd_install(fd, h_file); | |
12856 | + err = fd; | |
12857 | + goto out; /* success */ | |
12858 | + | |
4f0767ce | 12859 | +out_fd: |
4a4d8108 | 12860 | + put_unused_fd(fd); |
4f0767ce | 12861 | +out: |
4a4d8108 AM |
12862 | + return err; |
12863 | +} | |
12864 | + | |
12865 | +/* ---------------------------------------------------------------------- */ | |
12866 | + | |
12867 | +long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg) | |
12868 | +{ | |
12869 | + long err; | |
12870 | + | |
12871 | + switch (cmd) { | |
953406b4 AM |
12872 | + case AUFS_CTL_PLINK_MAINT: |
12873 | + case AUFS_CTL_PLINK_CLEAN: | |
12874 | + err = au_plink_ioctl(file, cmd); | |
12875 | + break; | |
12876 | + | |
4a4d8108 AM |
12877 | + case AUFS_CTL_RDU: |
12878 | + case AUFS_CTL_RDU_INO: | |
12879 | + err = au_rdu_ioctl(file, cmd, arg); | |
12880 | + break; | |
12881 | + | |
12882 | + case AUFS_CTL_WBR_FD: | |
12883 | + err = au_wbr_fd(&file->f_path); | |
12884 | + break; | |
12885 | + | |
12886 | + default: | |
12887 | + /* do not call the lower */ | |
12888 | + AuDbg("0x%x\n", cmd); | |
12889 | + err = -ENOTTY; | |
12890 | + } | |
12891 | + | |
12892 | + AuTraceErr(err); | |
12893 | + return err; | |
12894 | +} | |
12895 | + | |
12896 | +long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg) | |
12897 | +{ | |
12898 | + long err; | |
12899 | + | |
12900 | + switch (cmd) { | |
12901 | + case AUFS_CTL_WBR_FD: | |
12902 | + err = au_wbr_fd(&file->f_path); | |
12903 | + break; | |
12904 | + | |
12905 | + default: | |
12906 | + /* do not call the lower */ | |
12907 | + AuDbg("0x%x\n", cmd); | |
12908 | + err = -ENOTTY; | |
12909 | + } | |
12910 | + | |
12911 | + AuTraceErr(err); | |
12912 | + return err; | |
12913 | +} | |
b752ccd1 AM |
12914 | + |
12915 | +#ifdef CONFIG_COMPAT | |
12916 | +long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd, | |
12917 | + unsigned long arg) | |
12918 | +{ | |
12919 | + long err; | |
12920 | + | |
12921 | + switch (cmd) { | |
12922 | + case AUFS_CTL_RDU: | |
12923 | + case AUFS_CTL_RDU_INO: | |
12924 | + err = au_rdu_compat_ioctl(file, cmd, arg); | |
12925 | + break; | |
12926 | + | |
12927 | + default: | |
12928 | + err = aufs_ioctl_dir(file, cmd, arg); | |
12929 | + } | |
12930 | + | |
12931 | + AuTraceErr(err); | |
12932 | + return err; | |
12933 | +} | |
12934 | + | |
12935 | +#if 0 /* unused yet */ | |
12936 | +long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd, | |
12937 | + unsigned long arg) | |
12938 | +{ | |
12939 | + return aufs_ioctl_nondir(file, cmd, (unsigned long)compat_ptr(arg)); | |
12940 | +} | |
12941 | +#endif | |
12942 | +#endif | |
12943 | diff -urN /usr/share/empty/fs/aufs/i_op_add.c linux/fs/aufs/i_op_add.c | |
12944 | --- /usr/share/empty/fs/aufs/i_op_add.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
12945 | +++ linux/fs/aufs/i_op_add.c 2010-10-21 09:52:43.090291764 +0200 |
12946 | @@ -0,0 +1,672 @@ | |
4a4d8108 AM |
12947 | +/* |
12948 | + * Copyright (C) 2005-2010 Junjiro R. Okajima | |
12949 | + * | |
12950 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12951 | + * it under the terms of the GNU General Public License as published by | |
12952 | + * the Free Software Foundation; either version 2 of the License, or | |
12953 | + * (at your option) any later version. | |
12954 | + * | |
12955 | + * This program is distributed in the hope that it will be useful, | |
12956 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12957 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12958 | + * GNU General Public License for more details. | |
12959 | + * | |
12960 | + * You should have received a copy of the GNU General Public License | |
12961 | + * along with this program; if not, write to the Free Software | |
12962 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
12963 | + */ | |
12964 | + | |
12965 | +/* | |
12966 | + * inode operations (add entry) | |
12967 | + */ | |
12968 | + | |
12969 | +#include "aufs.h" | |
12970 | + | |
12971 | +/* | |
12972 | + * final procedure of adding a new entry, except link(2). | |
12973 | + * remove whiteout, instantiate, copyup the parent dir's times and size | |
12974 | + * and update version. | |
12975 | + * if it failed, re-create the removed whiteout. | |
12976 | + */ | |
12977 | +static int epilog(struct inode *dir, aufs_bindex_t bindex, | |
12978 | + struct dentry *wh_dentry, struct dentry *dentry) | |
12979 | +{ | |
12980 | + int err, rerr; | |
12981 | + aufs_bindex_t bwh; | |
12982 | + struct path h_path; | |
12983 | + struct inode *inode, *h_dir; | |
12984 | + struct dentry *wh; | |
12985 | + | |
12986 | + bwh = -1; | |
12987 | + if (wh_dentry) { | |
12988 | + h_dir = wh_dentry->d_parent->d_inode; /* dir inode is locked */ | |
12989 | + IMustLock(h_dir); | |
12990 | + AuDebugOn(au_h_iptr(dir, bindex) != h_dir); | |
12991 | + bwh = au_dbwh(dentry); | |
12992 | + h_path.dentry = wh_dentry; | |
12993 | + h_path.mnt = au_sbr_mnt(dir->i_sb, bindex); | |
12994 | + err = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, | |
12995 | + dentry); | |
12996 | + if (unlikely(err)) | |
12997 | + goto out; | |
12998 | + } | |
12999 | + | |
13000 | + inode = au_new_inode(dentry, /*must_new*/1); | |
13001 | + if (!IS_ERR(inode)) { | |
13002 | + d_instantiate(dentry, inode); | |
13003 | + dir = dentry->d_parent->d_inode; /* dir inode is locked */ | |
13004 | + IMustLock(dir); | |
13005 | + if (au_ibstart(dir) == au_dbstart(dentry)) | |
13006 | + au_cpup_attr_timesizes(dir); | |
13007 | + dir->i_version++; | |
13008 | + return 0; /* success */ | |
13009 | + } | |
13010 | + | |
13011 | + err = PTR_ERR(inode); | |
13012 | + if (!wh_dentry) | |
13013 | + goto out; | |
13014 | + | |
13015 | + /* revert */ | |
13016 | + /* dir inode is locked */ | |
13017 | + wh = au_wh_create(dentry, bwh, wh_dentry->d_parent); | |
13018 | + rerr = PTR_ERR(wh); | |
13019 | + if (IS_ERR(wh)) { | |
13020 | + AuIOErr("%.*s reverting whiteout failed(%d, %d)\n", | |
13021 | + AuDLNPair(dentry), err, rerr); | |
13022 | + err = -EIO; | |
13023 | + } else | |
13024 | + dput(wh); | |
13025 | + | |
4f0767ce | 13026 | +out: |
4a4d8108 AM |
13027 | + return err; |
13028 | +} | |
13029 | + | |
13030 | +/* | |
13031 | + * simple tests for the adding inode operations. | |
13032 | + * following the checks in vfs, plus the parent-child relationship. | |
13033 | + */ | |
13034 | +int au_may_add(struct dentry *dentry, aufs_bindex_t bindex, | |
13035 | + struct dentry *h_parent, int isdir) | |
13036 | +{ | |
13037 | + int err; | |
13038 | + umode_t h_mode; | |
13039 | + struct dentry *h_dentry; | |
13040 | + struct inode *h_inode; | |
13041 | + | |
13042 | + err = -ENAMETOOLONG; | |
13043 | + if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
13044 | + goto out; | |
13045 | + | |
13046 | + h_dentry = au_h_dptr(dentry, bindex); | |
13047 | + h_inode = h_dentry->d_inode; | |
13048 | + if (!dentry->d_inode) { | |
13049 | + err = -EEXIST; | |
13050 | + if (unlikely(h_inode)) | |
13051 | + goto out; | |
13052 | + } else { | |
13053 | + /* rename(2) case */ | |
13054 | + err = -EIO; | |
13055 | + if (unlikely(!h_inode || !h_inode->i_nlink)) | |
13056 | + goto out; | |
13057 | + | |
13058 | + h_mode = h_inode->i_mode; | |
13059 | + if (!isdir) { | |
13060 | + err = -EISDIR; | |
13061 | + if (unlikely(S_ISDIR(h_mode))) | |
13062 | + goto out; | |
13063 | + } else if (unlikely(!S_ISDIR(h_mode))) { | |
13064 | + err = -ENOTDIR; | |
13065 | + goto out; | |
13066 | + } | |
13067 | + } | |
13068 | + | |
13069 | + err = 0; | |
13070 | + /* expected parent dir is locked */ | |
13071 | + if (unlikely(h_parent != h_dentry->d_parent)) | |
13072 | + err = -EIO; | |
13073 | + | |
4f0767ce | 13074 | +out: |
4a4d8108 AM |
13075 | + AuTraceErr(err); |
13076 | + return err; | |
13077 | +} | |
13078 | + | |
13079 | +/* | |
13080 | + * initial procedure of adding a new entry. | |
13081 | + * prepare writable branch and the parent dir, lock it, | |
13082 | + * and lookup whiteout for the new entry. | |
13083 | + */ | |
13084 | +static struct dentry* | |
13085 | +lock_hdir_lkup_wh(struct dentry *dentry, struct au_dtime *dt, | |
13086 | + struct dentry *src_dentry, struct au_pin *pin, | |
13087 | + struct au_wr_dir_args *wr_dir_args) | |
13088 | +{ | |
13089 | + struct dentry *wh_dentry, *h_parent; | |
13090 | + struct super_block *sb; | |
13091 | + struct au_branch *br; | |
13092 | + int err; | |
13093 | + unsigned int udba; | |
13094 | + aufs_bindex_t bcpup; | |
13095 | + | |
13096 | + AuDbg("%.*s\n", AuDLNPair(dentry)); | |
13097 | + | |
13098 | + err = au_wr_dir(dentry, src_dentry, wr_dir_args); | |
13099 | + bcpup = err; | |
13100 | + wh_dentry = ERR_PTR(err); | |
13101 | + if (unlikely(err < 0)) | |
13102 | + goto out; | |
13103 | + | |
13104 | + sb = dentry->d_sb; | |
13105 | + udba = au_opt_udba(sb); | |
13106 | + err = au_pin(pin, dentry, bcpup, udba, | |
13107 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
13108 | + wh_dentry = ERR_PTR(err); | |
13109 | + if (unlikely(err)) | |
13110 | + goto out; | |
13111 | + | |
13112 | + h_parent = au_pinned_h_parent(pin); | |
13113 | + if (udba != AuOpt_UDBA_NONE | |
13114 | + && au_dbstart(dentry) == bcpup) | |
13115 | + err = au_may_add(dentry, bcpup, h_parent, | |
13116 | + au_ftest_wrdir(wr_dir_args->flags, ISDIR)); | |
13117 | + else if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
13118 | + err = -ENAMETOOLONG; | |
13119 | + wh_dentry = ERR_PTR(err); | |
13120 | + if (unlikely(err)) | |
13121 | + goto out_unpin; | |
13122 | + | |
13123 | + br = au_sbr(sb, bcpup); | |
13124 | + if (dt) { | |
13125 | + struct path tmp = { | |
13126 | + .dentry = h_parent, | |
13127 | + .mnt = br->br_mnt | |
13128 | + }; | |
13129 | + au_dtime_store(dt, au_pinned_parent(pin), &tmp); | |
13130 | + } | |
13131 | + | |
13132 | + wh_dentry = NULL; | |
13133 | + if (bcpup != au_dbwh(dentry)) | |
13134 | + goto out; /* success */ | |
13135 | + | |
13136 | + wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, br); | |
13137 | + | |
4f0767ce | 13138 | +out_unpin: |
4a4d8108 AM |
13139 | + if (IS_ERR(wh_dentry)) |
13140 | + au_unpin(pin); | |
4f0767ce | 13141 | +out: |
4a4d8108 AM |
13142 | + return wh_dentry; |
13143 | +} | |
13144 | + | |
13145 | +/* ---------------------------------------------------------------------- */ | |
13146 | + | |
13147 | +enum { Mknod, Symlink, Creat }; | |
13148 | +struct simple_arg { | |
13149 | + int type; | |
13150 | + union { | |
13151 | + struct { | |
13152 | + int mode; | |
13153 | + struct nameidata *nd; | |
13154 | + } c; | |
13155 | + struct { | |
13156 | + const char *symname; | |
13157 | + } s; | |
13158 | + struct { | |
13159 | + int mode; | |
13160 | + dev_t dev; | |
13161 | + } m; | |
13162 | + } u; | |
13163 | +}; | |
13164 | + | |
13165 | +static int add_simple(struct inode *dir, struct dentry *dentry, | |
13166 | + struct simple_arg *arg) | |
13167 | +{ | |
13168 | + int err; | |
13169 | + aufs_bindex_t bstart; | |
13170 | + unsigned char created; | |
13171 | + struct au_dtime dt; | |
13172 | + struct au_pin pin; | |
13173 | + struct path h_path; | |
13174 | + struct dentry *wh_dentry, *parent; | |
13175 | + struct inode *h_dir; | |
13176 | + struct au_wr_dir_args wr_dir_args = { | |
13177 | + .force_btgt = -1, | |
13178 | + .flags = AuWrDir_ADD_ENTRY | |
13179 | + }; | |
13180 | + | |
13181 | + AuDbg("%.*s\n", AuDLNPair(dentry)); | |
13182 | + IMustLock(dir); | |
13183 | + | |
13184 | + parent = dentry->d_parent; /* dir inode is locked */ | |
13185 | + aufs_read_lock(dentry, AuLock_DW); | |
13186 | + di_write_lock_parent(parent); | |
13187 | + wh_dentry = lock_hdir_lkup_wh(dentry, &dt, /*src_dentry*/NULL, &pin, | |
13188 | + &wr_dir_args); | |
13189 | + err = PTR_ERR(wh_dentry); | |
13190 | + if (IS_ERR(wh_dentry)) | |
13191 | + goto out; | |
13192 | + | |
13193 | + bstart = au_dbstart(dentry); | |
13194 | + h_path.dentry = au_h_dptr(dentry, bstart); | |
13195 | + h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart); | |
13196 | + h_dir = au_pinned_h_dir(&pin); | |
13197 | + switch (arg->type) { | |
13198 | + case Creat: | |
13199 | + err = vfsub_create(h_dir, &h_path, arg->u.c.mode); | |
13200 | + break; | |
13201 | + case Symlink: | |
13202 | + err = vfsub_symlink(h_dir, &h_path, arg->u.s.symname); | |
13203 | + break; | |
13204 | + case Mknod: | |
13205 | + err = vfsub_mknod(h_dir, &h_path, arg->u.m.mode, arg->u.m.dev); | |
13206 | + break; | |
13207 | + default: | |
13208 | + BUG(); | |
13209 | + } | |
13210 | + created = !err; | |
13211 | + if (!err) | |
13212 | + err = epilog(dir, bstart, wh_dentry, dentry); | |
13213 | + | |
13214 | + /* revert */ | |
13215 | + if (unlikely(created && err && h_path.dentry->d_inode)) { | |
13216 | + int rerr; | |
13217 | + rerr = vfsub_unlink(h_dir, &h_path, /*force*/0); | |
13218 | + if (rerr) { | |
13219 | + AuIOErr("%.*s revert failure(%d, %d)\n", | |
13220 | + AuDLNPair(dentry), err, rerr); | |
13221 | + err = -EIO; | |
13222 | + } | |
13223 | + au_dtime_revert(&dt); | |
13224 | + d_drop(dentry); | |
13225 | + } | |
13226 | + | |
13227 | + au_unpin(&pin); | |
13228 | + dput(wh_dentry); | |
13229 | + | |
4f0767ce | 13230 | +out: |
4a4d8108 AM |
13231 | + if (unlikely(err)) { |
13232 | + au_update_dbstart(dentry); | |
13233 | + d_drop(dentry); | |
13234 | + } | |
13235 | + di_write_unlock(parent); | |
13236 | + aufs_read_unlock(dentry, AuLock_DW); | |
13237 | + return err; | |
13238 | +} | |
13239 | + | |
13240 | +int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
13241 | +{ | |
13242 | + struct simple_arg arg = { | |
13243 | + .type = Mknod, | |
13244 | + .u.m = { | |
13245 | + .mode = mode, | |
13246 | + .dev = dev | |
13247 | + } | |
13248 | + }; | |
13249 | + return add_simple(dir, dentry, &arg); | |
13250 | +} | |
13251 | + | |
13252 | +int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
13253 | +{ | |
13254 | + struct simple_arg arg = { | |
13255 | + .type = Symlink, | |
13256 | + .u.s.symname = symname | |
13257 | + }; | |
13258 | + return add_simple(dir, dentry, &arg); | |
13259 | +} | |
13260 | + | |
13261 | +int aufs_create(struct inode *dir, struct dentry *dentry, int mode, | |
13262 | + struct nameidata *nd) | |
13263 | +{ | |
13264 | + struct simple_arg arg = { | |
13265 | + .type = Creat, | |
13266 | + .u.c = { | |
13267 | + .mode = mode, | |
13268 | + .nd = nd | |
13269 | + } | |
13270 | + }; | |
13271 | + return add_simple(dir, dentry, &arg); | |
13272 | +} | |
13273 | + | |
13274 | +/* ---------------------------------------------------------------------- */ | |
13275 | + | |
13276 | +struct au_link_args { | |
13277 | + aufs_bindex_t bdst, bsrc; | |
13278 | + struct au_pin pin; | |
13279 | + struct path h_path; | |
13280 | + struct dentry *src_parent, *parent; | |
13281 | +}; | |
13282 | + | |
13283 | +static int au_cpup_before_link(struct dentry *src_dentry, | |
13284 | + struct au_link_args *a) | |
13285 | +{ | |
13286 | + int err; | |
13287 | + struct dentry *h_src_dentry; | |
13288 | + struct mutex *h_mtx; | |
13289 | + struct file *h_file; | |
13290 | + | |
13291 | + di_read_lock_parent(a->src_parent, AuLock_IR); | |
13292 | + err = au_test_and_cpup_dirs(src_dentry, a->bdst); | |
13293 | + if (unlikely(err)) | |
13294 | + goto out; | |
13295 | + | |
13296 | + h_src_dentry = au_h_dptr(src_dentry, a->bsrc); | |
13297 | + h_mtx = &h_src_dentry->d_inode->i_mutex; | |
13298 | + err = au_pin(&a->pin, src_dentry, a->bdst, | |
13299 | + au_opt_udba(src_dentry->d_sb), | |
13300 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
13301 | + if (unlikely(err)) | |
13302 | + goto out; | |
13303 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); | |
13304 | + h_file = au_h_open_pre(src_dentry, a->bsrc); | |
13305 | + if (IS_ERR(h_file)) { | |
13306 | + err = PTR_ERR(h_file); | |
13307 | + h_file = NULL; | |
13308 | + } else | |
13309 | + err = au_sio_cpup_simple(src_dentry, a->bdst, a->bsrc, | |
13310 | + AuCpup_DTIME /* | AuCpup_KEEPLINO */); | |
13311 | + mutex_unlock(h_mtx); | |
13312 | + au_h_open_post(src_dentry, a->bsrc, h_file); | |
13313 | + au_unpin(&a->pin); | |
13314 | + | |
4f0767ce | 13315 | +out: |
4a4d8108 AM |
13316 | + di_read_unlock(a->src_parent, AuLock_IR); |
13317 | + return err; | |
13318 | +} | |
13319 | + | |
13320 | +static int au_cpup_or_link(struct dentry *src_dentry, struct au_link_args *a) | |
13321 | +{ | |
13322 | + int err; | |
13323 | + unsigned char plink; | |
13324 | + struct inode *h_inode, *inode; | |
13325 | + struct dentry *h_src_dentry; | |
13326 | + struct super_block *sb; | |
13327 | + struct file *h_file; | |
13328 | + | |
13329 | + plink = 0; | |
13330 | + h_inode = NULL; | |
13331 | + sb = src_dentry->d_sb; | |
13332 | + inode = src_dentry->d_inode; | |
13333 | + if (au_ibstart(inode) <= a->bdst) | |
13334 | + h_inode = au_h_iptr(inode, a->bdst); | |
13335 | + if (!h_inode || !h_inode->i_nlink) { | |
13336 | + /* copyup src_dentry as the name of dentry. */ | |
13337 | + au_set_dbstart(src_dentry, a->bdst); | |
13338 | + au_set_h_dptr(src_dentry, a->bdst, dget(a->h_path.dentry)); | |
13339 | + h_inode = au_h_dptr(src_dentry, a->bsrc)->d_inode; | |
13340 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); | |
13341 | + h_file = au_h_open_pre(src_dentry, a->bsrc); | |
13342 | + if (IS_ERR(h_file)) { | |
13343 | + err = PTR_ERR(h_file); | |
13344 | + h_file = NULL; | |
13345 | + } else | |
13346 | + err = au_sio_cpup_single(src_dentry, a->bdst, a->bsrc, | |
13347 | + -1, AuCpup_KEEPLINO, | |
13348 | + a->parent); | |
13349 | + mutex_unlock(&h_inode->i_mutex); | |
13350 | + au_h_open_post(src_dentry, a->bsrc, h_file); | |
13351 | + au_set_h_dptr(src_dentry, a->bdst, NULL); | |
13352 | + au_set_dbstart(src_dentry, a->bsrc); | |
13353 | + } else { | |
13354 | + /* the inode of src_dentry already exists on a.bdst branch */ | |
13355 | + h_src_dentry = d_find_alias(h_inode); | |
13356 | + if (!h_src_dentry && au_plink_test(inode)) { | |
13357 | + plink = 1; | |
13358 | + h_src_dentry = au_plink_lkup(inode, a->bdst); | |
13359 | + err = PTR_ERR(h_src_dentry); | |
13360 | + if (IS_ERR(h_src_dentry)) | |
13361 | + goto out; | |
13362 | + | |
13363 | + if (unlikely(!h_src_dentry->d_inode)) { | |
13364 | + dput(h_src_dentry); | |
13365 | + h_src_dentry = NULL; | |
13366 | + } | |
13367 | + | |
13368 | + } | |
13369 | + if (h_src_dentry) { | |
13370 | + err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin), | |
13371 | + &a->h_path); | |
13372 | + dput(h_src_dentry); | |
13373 | + } else { | |
13374 | + AuIOErr("no dentry found for hi%lu on b%d\n", | |
13375 | + h_inode->i_ino, a->bdst); | |
13376 | + err = -EIO; | |
13377 | + } | |
13378 | + } | |
13379 | + | |
13380 | + if (!err && !plink) | |
13381 | + au_plink_append(inode, a->bdst, a->h_path.dentry); | |
13382 | + | |
13383 | +out: | |
13384 | + return err; | |
13385 | +} | |
13386 | + | |
13387 | +int aufs_link(struct dentry *src_dentry, struct inode *dir, | |
13388 | + struct dentry *dentry) | |
13389 | +{ | |
13390 | + int err, rerr; | |
13391 | + struct au_dtime dt; | |
13392 | + struct au_link_args *a; | |
13393 | + struct dentry *wh_dentry, *h_src_dentry; | |
13394 | + struct inode *inode; | |
13395 | + struct super_block *sb; | |
13396 | + struct au_wr_dir_args wr_dir_args = { | |
13397 | + /* .force_btgt = -1, */ | |
13398 | + .flags = AuWrDir_ADD_ENTRY | |
13399 | + }; | |
13400 | + | |
13401 | + IMustLock(dir); | |
13402 | + inode = src_dentry->d_inode; | |
13403 | + IMustLock(inode); | |
13404 | + | |
13405 | + err = -ENOENT; | |
13406 | + if (unlikely(!inode->i_nlink)) | |
13407 | + goto out; | |
13408 | + | |
13409 | + err = -ENOMEM; | |
13410 | + a = kzalloc(sizeof(*a), GFP_NOFS); | |
13411 | + if (unlikely(!a)) | |
13412 | + goto out; | |
13413 | + | |
13414 | + a->parent = dentry->d_parent; /* dir inode is locked */ | |
953406b4 | 13415 | + aufs_read_and_write_lock2(dentry, src_dentry, /*AuLock_FLUSH*/0); |
4a4d8108 AM |
13416 | + a->src_parent = dget_parent(src_dentry); |
13417 | + wr_dir_args.force_btgt = au_dbstart(src_dentry); | |
13418 | + | |
13419 | + di_write_lock_parent(a->parent); | |
13420 | + wr_dir_args.force_btgt = au_wbr(dentry, wr_dir_args.force_btgt); | |
13421 | + wh_dentry = lock_hdir_lkup_wh(dentry, &dt, src_dentry, &a->pin, | |
13422 | + &wr_dir_args); | |
13423 | + err = PTR_ERR(wh_dentry); | |
13424 | + if (IS_ERR(wh_dentry)) | |
13425 | + goto out_unlock; | |
13426 | + | |
13427 | + err = 0; | |
13428 | + sb = dentry->d_sb; | |
13429 | + a->bdst = au_dbstart(dentry); | |
13430 | + a->h_path.dentry = au_h_dptr(dentry, a->bdst); | |
13431 | + a->h_path.mnt = au_sbr_mnt(sb, a->bdst); | |
13432 | + a->bsrc = au_dbstart(src_dentry); | |
13433 | + if (au_opt_test(au_mntflags(sb), PLINK)) { | |
13434 | + if (a->bdst < a->bsrc | |
13435 | + /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) | |
13436 | + err = au_cpup_or_link(src_dentry, a); | |
13437 | + else { | |
13438 | + h_src_dentry = au_h_dptr(src_dentry, a->bdst); | |
13439 | + err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin), | |
13440 | + &a->h_path); | |
13441 | + } | |
13442 | + } else { | |
13443 | + /* | |
13444 | + * copyup src_dentry to the branch we process, | |
13445 | + * and then link(2) to it. | |
13446 | + */ | |
13447 | + if (a->bdst < a->bsrc | |
13448 | + /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) { | |
13449 | + au_unpin(&a->pin); | |
13450 | + di_write_unlock(a->parent); | |
13451 | + err = au_cpup_before_link(src_dentry, a); | |
13452 | + di_write_lock_parent(a->parent); | |
13453 | + if (!err) | |
13454 | + err = au_pin(&a->pin, dentry, a->bdst, | |
13455 | + au_opt_udba(sb), | |
13456 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
13457 | + if (unlikely(err)) | |
13458 | + goto out_wh; | |
13459 | + } | |
13460 | + if (!err) { | |
13461 | + h_src_dentry = au_h_dptr(src_dentry, a->bdst); | |
13462 | + err = -ENOENT; | |
13463 | + if (h_src_dentry && h_src_dentry->d_inode) | |
13464 | + err = vfsub_link(h_src_dentry, | |
13465 | + au_pinned_h_dir(&a->pin), | |
13466 | + &a->h_path); | |
13467 | + } | |
13468 | + } | |
13469 | + if (unlikely(err)) | |
13470 | + goto out_unpin; | |
13471 | + | |
13472 | + if (wh_dentry) { | |
13473 | + a->h_path.dentry = wh_dentry; | |
13474 | + err = au_wh_unlink_dentry(au_pinned_h_dir(&a->pin), &a->h_path, | |
13475 | + dentry); | |
13476 | + if (unlikely(err)) | |
13477 | + goto out_revert; | |
13478 | + } | |
13479 | + | |
13480 | + dir->i_version++; | |
13481 | + if (au_ibstart(dir) == au_dbstart(dentry)) | |
13482 | + au_cpup_attr_timesizes(dir); | |
13483 | + inc_nlink(inode); | |
13484 | + inode->i_ctime = dir->i_ctime; | |
13485 | + if (!d_unhashed(a->h_path.dentry)) | |
13486 | + d_instantiate(dentry, au_igrab(inode)); | |
13487 | + else | |
13488 | + /* some filesystem calls d_drop() */ | |
13489 | + d_drop(dentry); | |
13490 | + goto out_unpin; /* success */ | |
13491 | + | |
4f0767ce | 13492 | +out_revert: |
4a4d8108 AM |
13493 | + rerr = vfsub_unlink(au_pinned_h_dir(&a->pin), &a->h_path, /*force*/0); |
13494 | + if (!rerr) | |
13495 | + goto out_dt; | |
13496 | + AuIOErr("%.*s reverting failed(%d, %d)\n", | |
13497 | + AuDLNPair(dentry), err, rerr); | |
13498 | + err = -EIO; | |
4f0767ce | 13499 | +out_dt: |
4a4d8108 AM |
13500 | + d_drop(dentry); |
13501 | + au_dtime_revert(&dt); | |
4f0767ce | 13502 | +out_unpin: |
4a4d8108 | 13503 | + au_unpin(&a->pin); |
4f0767ce | 13504 | +out_wh: |
4a4d8108 | 13505 | + dput(wh_dentry); |
4f0767ce | 13506 | +out_unlock: |
4a4d8108 AM |
13507 | + if (unlikely(err)) { |
13508 | + au_update_dbstart(dentry); | |
13509 | + d_drop(dentry); | |
13510 | + } | |
13511 | + di_write_unlock(a->parent); | |
13512 | + dput(a->src_parent); | |
13513 | + aufs_read_and_write_unlock2(dentry, src_dentry); | |
13514 | + kfree(a); | |
4f0767ce | 13515 | +out: |
4a4d8108 AM |
13516 | + return err; |
13517 | +} | |
13518 | + | |
13519 | +int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
13520 | +{ | |
13521 | + int err, rerr; | |
13522 | + aufs_bindex_t bindex; | |
13523 | + unsigned char diropq; | |
13524 | + struct path h_path; | |
13525 | + struct dentry *wh_dentry, *parent, *opq_dentry; | |
13526 | + struct mutex *h_mtx; | |
13527 | + struct super_block *sb; | |
13528 | + struct { | |
13529 | + struct au_pin pin; | |
13530 | + struct au_dtime dt; | |
13531 | + } *a; /* reduce the stack usage */ | |
13532 | + struct au_wr_dir_args wr_dir_args = { | |
13533 | + .force_btgt = -1, | |
13534 | + .flags = AuWrDir_ADD_ENTRY | AuWrDir_ISDIR | |
13535 | + }; | |
13536 | + | |
13537 | + IMustLock(dir); | |
13538 | + | |
13539 | + err = -ENOMEM; | |
13540 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
13541 | + if (unlikely(!a)) | |
13542 | + goto out; | |
13543 | + | |
13544 | + aufs_read_lock(dentry, AuLock_DW); | |
13545 | + parent = dentry->d_parent; /* dir inode is locked */ | |
13546 | + di_write_lock_parent(parent); | |
13547 | + wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL, | |
13548 | + &a->pin, &wr_dir_args); | |
13549 | + err = PTR_ERR(wh_dentry); | |
13550 | + if (IS_ERR(wh_dentry)) | |
13551 | + goto out_free; | |
13552 | + | |
13553 | + sb = dentry->d_sb; | |
13554 | + bindex = au_dbstart(dentry); | |
13555 | + h_path.dentry = au_h_dptr(dentry, bindex); | |
13556 | + h_path.mnt = au_sbr_mnt(sb, bindex); | |
13557 | + err = vfsub_mkdir(au_pinned_h_dir(&a->pin), &h_path, mode); | |
13558 | + if (unlikely(err)) | |
13559 | + goto out_unlock; | |
13560 | + | |
13561 | + /* make the dir opaque */ | |
13562 | + diropq = 0; | |
13563 | + h_mtx = &h_path.dentry->d_inode->i_mutex; | |
13564 | + if (wh_dentry | |
13565 | + || au_opt_test(au_mntflags(sb), ALWAYS_DIROPQ)) { | |
13566 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); | |
13567 | + opq_dentry = au_diropq_create(dentry, bindex); | |
13568 | + mutex_unlock(h_mtx); | |
13569 | + err = PTR_ERR(opq_dentry); | |
13570 | + if (IS_ERR(opq_dentry)) | |
13571 | + goto out_dir; | |
13572 | + dput(opq_dentry); | |
13573 | + diropq = 1; | |
13574 | + } | |
13575 | + | |
13576 | + err = epilog(dir, bindex, wh_dentry, dentry); | |
13577 | + if (!err) { | |
13578 | + inc_nlink(dir); | |
13579 | + goto out_unlock; /* success */ | |
13580 | + } | |
13581 | + | |
13582 | + /* revert */ | |
13583 | + if (diropq) { | |
13584 | + AuLabel(revert opq); | |
13585 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); | |
13586 | + rerr = au_diropq_remove(dentry, bindex); | |
13587 | + mutex_unlock(h_mtx); | |
13588 | + if (rerr) { | |
13589 | + AuIOErr("%.*s reverting diropq failed(%d, %d)\n", | |
13590 | + AuDLNPair(dentry), err, rerr); | |
13591 | + err = -EIO; | |
13592 | + } | |
13593 | + } | |
13594 | + | |
4f0767ce | 13595 | +out_dir: |
4a4d8108 AM |
13596 | + AuLabel(revert dir); |
13597 | + rerr = vfsub_rmdir(au_pinned_h_dir(&a->pin), &h_path); | |
13598 | + if (rerr) { | |
13599 | + AuIOErr("%.*s reverting dir failed(%d, %d)\n", | |
13600 | + AuDLNPair(dentry), err, rerr); | |
13601 | + err = -EIO; | |
13602 | + } | |
13603 | + d_drop(dentry); | |
13604 | + au_dtime_revert(&a->dt); | |
4f0767ce | 13605 | +out_unlock: |
4a4d8108 AM |
13606 | + au_unpin(&a->pin); |
13607 | + dput(wh_dentry); | |
4f0767ce | 13608 | +out_free: |
4a4d8108 AM |
13609 | + if (unlikely(err)) { |
13610 | + au_update_dbstart(dentry); | |
13611 | + d_drop(dentry); | |
13612 | + } | |
13613 | + di_write_unlock(parent); | |
13614 | + aufs_read_unlock(dentry, AuLock_DW); | |
13615 | + kfree(a); | |
4f0767ce | 13616 | +out: |
4a4d8108 AM |
13617 | + return err; |
13618 | +} | |
b752ccd1 AM |
13619 | diff -urN /usr/share/empty/fs/aufs/i_op.c linux/fs/aufs/i_op.c |
13620 | --- /usr/share/empty/fs/aufs/i_op.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
13621 | +++ linux/fs/aufs/i_op.c 2010-10-21 09:52:43.090291764 +0200 |
13622 | @@ -0,0 +1,911 @@ | |
4a4d8108 AM |
13623 | +/* |
13624 | + * Copyright (C) 2005-2010 Junjiro R. Okajima | |
13625 | + * | |
13626 | + * This program, aufs is free software; you can redistribute it and/or modify | |
13627 | + * it under the terms of the GNU General Public License as published by | |
13628 | + * the Free Software Foundation; either version 2 of the License, or | |
13629 | + * (at your option) any later version. | |
13630 | + * | |
13631 | + * This program is distributed in the hope that it will be useful, | |
13632 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13633 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13634 | + * GNU General Public License for more details. | |
13635 | + * | |
13636 | + * You should have received a copy of the GNU General Public License | |
13637 | + * along with this program; if not, write to the Free Software | |
13638 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
13639 | + */ | |
1facf9fc | 13640 | + |
1308ab2a | 13641 | +/* |
4a4d8108 | 13642 | + * inode operations (except add/del/rename) |
1308ab2a | 13643 | + */ |
4a4d8108 AM |
13644 | + |
13645 | +#include <linux/device_cgroup.h> | |
13646 | +#include <linux/fs_stack.h> | |
13647 | +#include <linux/mm.h> | |
13648 | +#include <linux/namei.h> | |
13649 | +#include <linux/security.h> | |
13650 | +#include <linux/uaccess.h> | |
13651 | +#include "aufs.h" | |
13652 | + | |
13653 | +static int h_permission(struct inode *h_inode, int mask, | |
13654 | + struct vfsmount *h_mnt, int brperm) | |
1facf9fc | 13655 | +{ |
1308ab2a | 13656 | + int err; |
4a4d8108 | 13657 | + const unsigned char write_mask = !!(mask & (MAY_WRITE | MAY_APPEND)); |
1facf9fc | 13658 | + |
4a4d8108 AM |
13659 | + err = -EACCES; |
13660 | + if ((write_mask && IS_IMMUTABLE(h_inode)) | |
13661 | + || ((mask & MAY_EXEC) | |
13662 | + && S_ISREG(h_inode->i_mode) | |
13663 | + && ((h_mnt->mnt_flags & MNT_NOEXEC) | |
13664 | + || !(h_inode->i_mode & S_IXUGO)))) | |
13665 | + goto out; | |
13666 | + | |
13667 | + /* | |
13668 | + * - skip the lower fs test in the case of write to ro branch. | |
13669 | + * - nfs dir permission write check is optimized, but a policy for | |
13670 | + * link/rename requires a real check. | |
13671 | + */ | |
13672 | + if ((write_mask && !au_br_writable(brperm)) | |
13673 | + || (au_test_nfs(h_inode->i_sb) && S_ISDIR(h_inode->i_mode) | |
13674 | + && write_mask && !(mask & MAY_READ)) | |
13675 | + || !h_inode->i_op->permission) { | |
13676 | + /* AuLabel(generic_permission); */ | |
13677 | + err = generic_permission(h_inode, mask, | |
13678 | + h_inode->i_op->check_acl); | |
1308ab2a | 13679 | + } else { |
4a4d8108 AM |
13680 | + /* AuLabel(h_inode->permission); */ |
13681 | + err = h_inode->i_op->permission(h_inode, mask); | |
13682 | + AuTraceErr(err); | |
13683 | + } | |
1facf9fc | 13684 | + |
4a4d8108 AM |
13685 | + if (!err) |
13686 | + err = devcgroup_inode_permission(h_inode, mask); | |
953406b4 | 13687 | + if (!err) |
4a4d8108 | 13688 | + err = security_inode_permission(h_inode, mask); |
4a4d8108 AM |
13689 | + |
13690 | +#if 0 | |
13691 | + if (!err) { | |
13692 | + /* todo: do we need to call ima_path_check()? */ | |
13693 | + struct path h_path = { | |
13694 | + .dentry = | |
13695 | + .mnt = h_mnt | |
13696 | + }; | |
13697 | + err = ima_path_check(&h_path, | |
13698 | + mask & (MAY_READ | MAY_WRITE | MAY_EXEC), | |
13699 | + IMA_COUNT_LEAVE); | |
1308ab2a | 13700 | + } |
4a4d8108 | 13701 | +#endif |
dece6358 | 13702 | + |
4f0767ce | 13703 | +out: |
1308ab2a | 13704 | + return err; |
13705 | +} | |
dece6358 | 13706 | + |
4a4d8108 | 13707 | +static int aufs_permission(struct inode *inode, int mask) |
1308ab2a | 13708 | +{ |
13709 | + int err; | |
4a4d8108 AM |
13710 | + aufs_bindex_t bindex, bend; |
13711 | + const unsigned char isdir = !!S_ISDIR(inode->i_mode), | |
13712 | + write_mask = !!(mask & (MAY_WRITE | MAY_APPEND)); | |
13713 | + struct inode *h_inode; | |
13714 | + struct super_block *sb; | |
13715 | + struct au_branch *br; | |
1facf9fc | 13716 | + |
4a4d8108 AM |
13717 | + sb = inode->i_sb; |
13718 | + si_read_lock(sb, AuLock_FLUSH); | |
13719 | + ii_read_lock_child(inode); | |
dece6358 | 13720 | + |
4a4d8108 AM |
13721 | + if (!isdir || write_mask) { |
13722 | + err = au_busy_or_stale(); | |
13723 | + h_inode = au_h_iptr(inode, au_ibstart(inode)); | |
13724 | + if (unlikely(!h_inode | |
13725 | + || (h_inode->i_mode & S_IFMT) | |
13726 | + != (inode->i_mode & S_IFMT))) | |
13727 | + goto out; | |
1facf9fc | 13728 | + |
4a4d8108 AM |
13729 | + err = 0; |
13730 | + bindex = au_ibstart(inode); | |
13731 | + br = au_sbr(sb, bindex); | |
13732 | + err = h_permission(h_inode, mask, br->br_mnt, br->br_perm); | |
13733 | + if (write_mask | |
13734 | + && !err | |
13735 | + && !special_file(h_inode->i_mode)) { | |
13736 | + /* test whether the upper writable branch exists */ | |
13737 | + err = -EROFS; | |
13738 | + for (; bindex >= 0; bindex--) | |
13739 | + if (!au_br_rdonly(au_sbr(sb, bindex))) { | |
13740 | + err = 0; | |
13741 | + break; | |
13742 | + } | |
13743 | + } | |
13744 | + goto out; | |
13745 | + } | |
dece6358 | 13746 | + |
4a4d8108 | 13747 | + /* non-write to dir */ |
1308ab2a | 13748 | + err = 0; |
4a4d8108 AM |
13749 | + bend = au_ibend(inode); |
13750 | + for (bindex = au_ibstart(inode); !err && bindex <= bend; bindex++) { | |
13751 | + h_inode = au_h_iptr(inode, bindex); | |
13752 | + if (h_inode) { | |
13753 | + err = au_busy_or_stale(); | |
13754 | + if (unlikely(!S_ISDIR(h_inode->i_mode))) | |
13755 | + break; | |
13756 | + | |
13757 | + br = au_sbr(sb, bindex); | |
13758 | + err = h_permission(h_inode, mask, br->br_mnt, | |
13759 | + br->br_perm); | |
13760 | + } | |
13761 | + } | |
1308ab2a | 13762 | + |
4f0767ce | 13763 | +out: |
4a4d8108 AM |
13764 | + ii_read_unlock(inode); |
13765 | + si_read_unlock(sb); | |
1308ab2a | 13766 | + return err; |
13767 | +} | |
13768 | + | |
4a4d8108 | 13769 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 13770 | + |
4a4d8108 AM |
13771 | +static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry, |
13772 | + struct nameidata *nd) | |
13773 | +{ | |
13774 | + struct dentry *ret, *parent; | |
b752ccd1 | 13775 | + struct inode *inode; |
4a4d8108 AM |
13776 | + struct super_block *sb; |
13777 | + int err, npositive; | |
dece6358 | 13778 | + |
4a4d8108 | 13779 | + IMustLock(dir); |
1308ab2a | 13780 | + |
4a4d8108 AM |
13781 | + sb = dir->i_sb; |
13782 | + si_read_lock(sb, AuLock_FLUSH); | |
13783 | + ret = ERR_PTR(-ENAMETOOLONG); | |
13784 | + if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
13785 | + goto out; | |
13786 | + err = au_di_init(dentry); | |
13787 | + ret = ERR_PTR(err); | |
13788 | + if (unlikely(err)) | |
13789 | + goto out; | |
1308ab2a | 13790 | + |
4a4d8108 AM |
13791 | + parent = dentry->d_parent; /* dir inode is locked */ |
13792 | + di_read_lock_parent(parent, AuLock_IR); | |
13793 | + npositive = au_lkup_dentry(dentry, au_dbstart(parent), /*type*/0, nd); | |
13794 | + di_read_unlock(parent, AuLock_IR); | |
13795 | + err = npositive; | |
13796 | + ret = ERR_PTR(err); | |
13797 | + if (unlikely(err < 0)) | |
13798 | + goto out_unlock; | |
1308ab2a | 13799 | + |
4a4d8108 AM |
13800 | + inode = NULL; |
13801 | + if (npositive) { | |
b752ccd1 | 13802 | + inode = au_new_inode(dentry, /*must_new*/0); |
4a4d8108 | 13803 | + ret = (void *)inode; |
1facf9fc | 13804 | + } |
4a4d8108 AM |
13805 | + if (IS_ERR(inode)) |
13806 | + goto out_unlock; | |
13807 | + | |
13808 | + ret = d_splice_alias(inode, dentry); | |
13809 | + if (unlikely(IS_ERR(ret) && inode)) | |
13810 | + ii_write_unlock(inode); | |
1facf9fc | 13811 | + |
4f0767ce | 13812 | +out_unlock: |
4a4d8108 | 13813 | + di_write_unlock(dentry); |
4f0767ce | 13814 | +out: |
4a4d8108 AM |
13815 | + si_read_unlock(sb); |
13816 | + return ret; | |
13817 | +} | |
1facf9fc | 13818 | + |
4a4d8108 | 13819 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 13820 | + |
4a4d8108 AM |
13821 | +static int au_wr_dir_cpup(struct dentry *dentry, struct dentry *parent, |
13822 | + const unsigned char add_entry, aufs_bindex_t bcpup, | |
13823 | + aufs_bindex_t bstart) | |
13824 | +{ | |
13825 | + int err; | |
13826 | + struct dentry *h_parent; | |
13827 | + struct inode *h_dir; | |
1facf9fc | 13828 | + |
4a4d8108 AM |
13829 | + if (add_entry) { |
13830 | + au_update_dbstart(dentry); | |
13831 | + IMustLock(parent->d_inode); | |
13832 | + } else | |
13833 | + di_write_lock_parent(parent); | |
13834 | + | |
13835 | + err = 0; | |
13836 | + if (!au_h_dptr(parent, bcpup)) { | |
13837 | + if (bstart < bcpup) | |
13838 | + err = au_cpdown_dirs(dentry, bcpup); | |
13839 | + else | |
13840 | + err = au_cpup_dirs(dentry, bcpup); | |
13841 | + } | |
13842 | + if (!err && add_entry) { | |
13843 | + h_parent = au_h_dptr(parent, bcpup); | |
13844 | + h_dir = h_parent->d_inode; | |
13845 | + mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT); | |
13846 | + err = au_lkup_neg(dentry, bcpup); | |
13847 | + /* todo: no unlock here */ | |
13848 | + mutex_unlock(&h_dir->i_mutex); | |
13849 | + if (bstart < bcpup && au_dbstart(dentry) < 0) { | |
13850 | + au_set_dbstart(dentry, 0); | |
13851 | + au_update_dbrange(dentry, /*do_put_zero*/0); | |
13852 | + } | |
1308ab2a | 13853 | + } |
1facf9fc | 13854 | + |
4a4d8108 AM |
13855 | + if (!add_entry) |
13856 | + di_write_unlock(parent); | |
13857 | + if (!err) | |
13858 | + err = bcpup; /* success */ | |
1308ab2a | 13859 | + |
4a4d8108 AM |
13860 | + return err; |
13861 | +} | |
1facf9fc | 13862 | + |
4a4d8108 AM |
13863 | +/* |
13864 | + * decide the branch and the parent dir where we will create a new entry. | |
13865 | + * returns new bindex or an error. | |
13866 | + * copyup the parent dir if needed. | |
13867 | + */ | |
13868 | +int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry, | |
13869 | + struct au_wr_dir_args *args) | |
13870 | +{ | |
13871 | + int err; | |
13872 | + aufs_bindex_t bcpup, bstart, src_bstart; | |
13873 | + const unsigned char add_entry = !!au_ftest_wrdir(args->flags, | |
13874 | + ADD_ENTRY); | |
13875 | + struct super_block *sb; | |
13876 | + struct dentry *parent; | |
13877 | + struct au_sbinfo *sbinfo; | |
1facf9fc | 13878 | + |
4a4d8108 AM |
13879 | + sb = dentry->d_sb; |
13880 | + sbinfo = au_sbi(sb); | |
13881 | + parent = dget_parent(dentry); | |
13882 | + bstart = au_dbstart(dentry); | |
13883 | + bcpup = bstart; | |
13884 | + if (args->force_btgt < 0) { | |
13885 | + if (src_dentry) { | |
13886 | + src_bstart = au_dbstart(src_dentry); | |
13887 | + if (src_bstart < bstart) | |
13888 | + bcpup = src_bstart; | |
13889 | + } else if (add_entry) { | |
13890 | + err = AuWbrCreate(sbinfo, dentry, | |
13891 | + au_ftest_wrdir(args->flags, ISDIR)); | |
13892 | + bcpup = err; | |
13893 | + } | |
1facf9fc | 13894 | + |
4a4d8108 AM |
13895 | + if (bcpup < 0 || au_test_ro(sb, bcpup, dentry->d_inode)) { |
13896 | + if (add_entry) | |
13897 | + err = AuWbrCopyup(sbinfo, dentry); | |
13898 | + else { | |
13899 | + if (!IS_ROOT(dentry)) { | |
13900 | + di_read_lock_parent(parent, !AuLock_IR); | |
13901 | + err = AuWbrCopyup(sbinfo, dentry); | |
13902 | + di_read_unlock(parent, !AuLock_IR); | |
13903 | + } else | |
13904 | + err = AuWbrCopyup(sbinfo, dentry); | |
13905 | + } | |
13906 | + bcpup = err; | |
13907 | + if (unlikely(err < 0)) | |
13908 | + goto out; | |
13909 | + } | |
13910 | + } else { | |
13911 | + bcpup = args->force_btgt; | |
13912 | + AuDebugOn(au_test_ro(sb, bcpup, dentry->d_inode)); | |
1308ab2a | 13913 | + } |
4a4d8108 AM |
13914 | + AuDbg("bstart %d, bcpup %d\n", bstart, bcpup); |
13915 | + err = bcpup; | |
13916 | + if (bcpup == bstart) | |
13917 | + goto out; /* success */ | |
13918 | + else if (bstart < bcpup) | |
13919 | + au_update_dbrange(dentry, /*do_put_zero*/1); | |
13920 | + | |
13921 | + /* copyup the new parent into the branch we process */ | |
13922 | + err = au_wr_dir_cpup(dentry, parent, add_entry, bcpup, bstart); | |
13923 | + | |
4f0767ce | 13924 | +out: |
4a4d8108 | 13925 | + dput(parent); |
dece6358 AM |
13926 | + return err; |
13927 | +} | |
1facf9fc | 13928 | + |
1308ab2a | 13929 | +/* ---------------------------------------------------------------------- */ |
13930 | + | |
4a4d8108 | 13931 | +struct dentry *au_pinned_h_parent(struct au_pin *pin) |
1308ab2a | 13932 | +{ |
4a4d8108 AM |
13933 | + if (pin && pin->parent) |
13934 | + return au_h_dptr(pin->parent, pin->bindex); | |
13935 | + return NULL; | |
dece6358 | 13936 | +} |
1facf9fc | 13937 | + |
4a4d8108 | 13938 | +void au_unpin(struct au_pin *p) |
dece6358 | 13939 | +{ |
953406b4 | 13940 | + if (au_ftest_pin(p->flags, MNT_WRITE)) |
4a4d8108 AM |
13941 | + mnt_drop_write(p->h_mnt); |
13942 | + if (!p->hdir) | |
13943 | + return; | |
1facf9fc | 13944 | + |
4a4d8108 AM |
13945 | + au_hn_imtx_unlock(p->hdir); |
13946 | + if (!au_ftest_pin(p->flags, DI_LOCKED)) | |
13947 | + di_read_unlock(p->parent, AuLock_IR); | |
13948 | + iput(p->hdir->hi_inode); | |
13949 | + dput(p->parent); | |
13950 | + p->parent = NULL; | |
13951 | + p->hdir = NULL; | |
13952 | + p->h_mnt = NULL; | |
13953 | +} | |
1308ab2a | 13954 | + |
4a4d8108 AM |
13955 | +int au_do_pin(struct au_pin *p) |
13956 | +{ | |
13957 | + int err; | |
13958 | + struct super_block *sb; | |
13959 | + struct dentry *h_dentry, *h_parent; | |
13960 | + struct au_branch *br; | |
13961 | + struct inode *h_dir; | |
13962 | + | |
13963 | + err = 0; | |
13964 | + sb = p->dentry->d_sb; | |
13965 | + br = au_sbr(sb, p->bindex); | |
13966 | + if (IS_ROOT(p->dentry)) { | |
13967 | + if (au_ftest_pin(p->flags, MNT_WRITE)) { | |
13968 | + p->h_mnt = br->br_mnt; | |
13969 | + err = mnt_want_write(p->h_mnt); | |
13970 | + if (unlikely(err)) { | |
13971 | + au_fclr_pin(p->flags, MNT_WRITE); | |
13972 | + goto out_err; | |
13973 | + } | |
13974 | + } | |
dece6358 | 13975 | + goto out; |
1facf9fc | 13976 | + } |
13977 | + | |
4a4d8108 AM |
13978 | + h_dentry = NULL; |
13979 | + if (p->bindex <= au_dbend(p->dentry)) | |
13980 | + h_dentry = au_h_dptr(p->dentry, p->bindex); | |
dece6358 | 13981 | + |
4a4d8108 AM |
13982 | + p->parent = dget_parent(p->dentry); |
13983 | + if (!au_ftest_pin(p->flags, DI_LOCKED)) | |
13984 | + di_read_lock(p->parent, AuLock_IR, p->lsc_di); | |
dece6358 | 13985 | + |
4a4d8108 AM |
13986 | + h_dir = NULL; |
13987 | + h_parent = au_h_dptr(p->parent, p->bindex); | |
13988 | + p->hdir = au_hi(p->parent->d_inode, p->bindex); | |
13989 | + if (p->hdir) | |
13990 | + h_dir = p->hdir->hi_inode; | |
dece6358 | 13991 | + |
b752ccd1 AM |
13992 | + /* |
13993 | + * udba case, or | |
13994 | + * if DI_LOCKED is not set, then p->parent may be different | |
13995 | + * and h_parent can be NULL. | |
13996 | + */ | |
13997 | + if (unlikely(!p->hdir || !h_dir || !h_parent)) { | |
4a4d8108 AM |
13998 | + if (!au_ftest_pin(p->flags, DI_LOCKED)) |
13999 | + di_read_unlock(p->parent, AuLock_IR); | |
14000 | + dput(p->parent); | |
14001 | + p->parent = NULL; | |
14002 | + goto out_err; | |
14003 | + } | |
1308ab2a | 14004 | + |
4a4d8108 AM |
14005 | + au_igrab(h_dir); |
14006 | + au_hn_imtx_lock_nested(p->hdir, p->lsc_hi); | |
1308ab2a | 14007 | + |
4a4d8108 AM |
14008 | + if (unlikely(p->hdir->hi_inode != h_parent->d_inode)) { |
14009 | + err = -EBUSY; | |
14010 | + goto out_unpin; | |
14011 | + } | |
14012 | + if (h_dentry) { | |
14013 | + err = au_h_verify(h_dentry, p->udba, h_dir, h_parent, br); | |
14014 | + if (unlikely(err)) { | |
14015 | + au_fclr_pin(p->flags, MNT_WRITE); | |
14016 | + goto out_unpin; | |
14017 | + } | |
1facf9fc | 14018 | + } |
dece6358 | 14019 | + |
4a4d8108 AM |
14020 | + if (au_ftest_pin(p->flags, MNT_WRITE)) { |
14021 | + p->h_mnt = br->br_mnt; | |
14022 | + err = mnt_want_write(p->h_mnt); | |
dece6358 | 14023 | + if (unlikely(err)) { |
4a4d8108 AM |
14024 | + au_fclr_pin(p->flags, MNT_WRITE); |
14025 | + goto out_unpin; | |
dece6358 AM |
14026 | + } |
14027 | + } | |
4a4d8108 AM |
14028 | + goto out; /* success */ |
14029 | + | |
4f0767ce | 14030 | +out_unpin: |
4a4d8108 | 14031 | + au_unpin(p); |
4f0767ce | 14032 | +out_err: |
4a4d8108 AM |
14033 | + pr_err("err %d\n", err); |
14034 | + err = au_busy_or_stale(); | |
4f0767ce | 14035 | +out: |
1facf9fc | 14036 | + return err; |
14037 | +} | |
14038 | + | |
4a4d8108 AM |
14039 | +void au_pin_init(struct au_pin *p, struct dentry *dentry, |
14040 | + aufs_bindex_t bindex, int lsc_di, int lsc_hi, | |
14041 | + unsigned int udba, unsigned char flags) | |
14042 | +{ | |
14043 | + p->dentry = dentry; | |
14044 | + p->udba = udba; | |
14045 | + p->lsc_di = lsc_di; | |
14046 | + p->lsc_hi = lsc_hi; | |
14047 | + p->flags = flags; | |
14048 | + p->bindex = bindex; | |
14049 | + | |
14050 | + p->parent = NULL; | |
14051 | + p->hdir = NULL; | |
14052 | + p->h_mnt = NULL; | |
14053 | +} | |
14054 | + | |
14055 | +int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex, | |
14056 | + unsigned int udba, unsigned char flags) | |
14057 | +{ | |
14058 | + au_pin_init(pin, dentry, bindex, AuLsc_DI_PARENT, AuLsc_I_PARENT2, | |
14059 | + udba, flags); | |
14060 | + return au_do_pin(pin); | |
14061 | +} | |
14062 | + | |
dece6358 AM |
14063 | +/* ---------------------------------------------------------------------- */ |
14064 | + | |
1308ab2a | 14065 | +/* |
4a4d8108 AM |
14066 | + * ->setattr() and ->getattr() are called in various cases. |
14067 | + * chmod, stat: dentry is revalidated. | |
14068 | + * fchmod, fstat: file and dentry are not revalidated, additionally they may be | |
14069 | + * unhashed. | |
14070 | + * for ->setattr(), ia->ia_file is passed from ftruncate only. | |
1308ab2a | 14071 | + */ |
4a4d8108 | 14072 | +static int au_reval_for_attr(struct dentry *dentry, unsigned int sigen) |
1facf9fc | 14073 | +{ |
4a4d8108 AM |
14074 | + int err; |
14075 | + struct inode *inode; | |
14076 | + struct dentry *parent; | |
1facf9fc | 14077 | + |
1308ab2a | 14078 | + err = 0; |
4a4d8108 AM |
14079 | + inode = dentry->d_inode; |
14080 | + if (au_digen(dentry) != sigen || au_iigen(inode) != sigen) { | |
14081 | + parent = dget_parent(dentry); | |
14082 | + di_read_lock_parent(parent, AuLock_IR); | |
14083 | + /* returns a number of positive dentries */ | |
14084 | + err = au_refresh_hdentry(dentry, inode->i_mode & S_IFMT); | |
14085 | + if (err >= 0) | |
14086 | + err = au_refresh_hinode(inode, dentry); | |
14087 | + di_read_unlock(parent, AuLock_IR); | |
14088 | + dput(parent); | |
dece6358 | 14089 | + } |
1facf9fc | 14090 | + |
4a4d8108 | 14091 | + AuTraceErr(err); |
1308ab2a | 14092 | + return err; |
14093 | +} | |
dece6358 | 14094 | + |
4a4d8108 AM |
14095 | +#define AuIcpup_DID_CPUP 1 |
14096 | +#define au_ftest_icpup(flags, name) ((flags) & AuIcpup_##name) | |
14097 | +#define au_fset_icpup(flags, name) { (flags) |= AuIcpup_##name; } | |
14098 | +#define au_fclr_icpup(flags, name) { (flags) &= ~AuIcpup_##name; } | |
1308ab2a | 14099 | + |
4a4d8108 AM |
14100 | +struct au_icpup_args { |
14101 | + unsigned char flags; | |
14102 | + unsigned char pin_flags; | |
14103 | + aufs_bindex_t btgt; | |
14104 | + unsigned int udba; | |
14105 | + struct au_pin pin; | |
14106 | + struct path h_path; | |
14107 | + struct inode *h_inode; | |
14108 | +}; | |
1308ab2a | 14109 | + |
4a4d8108 AM |
14110 | +static int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia, |
14111 | + struct au_icpup_args *a) | |
1308ab2a | 14112 | +{ |
14113 | + int err; | |
4a4d8108 | 14114 | + loff_t sz; |
953406b4 | 14115 | + aufs_bindex_t bstart; |
4a4d8108 AM |
14116 | + struct dentry *hi_wh, *parent; |
14117 | + struct inode *inode; | |
14118 | + struct file *h_file; | |
14119 | + struct au_wr_dir_args wr_dir_args = { | |
14120 | + .force_btgt = -1, | |
14121 | + .flags = 0 | |
14122 | + }; | |
14123 | + | |
14124 | + bstart = au_dbstart(dentry); | |
14125 | + inode = dentry->d_inode; | |
14126 | + if (S_ISDIR(inode->i_mode)) | |
14127 | + au_fset_wrdir(wr_dir_args.flags, ISDIR); | |
14128 | + /* plink or hi_wh() case */ | |
953406b4 AM |
14129 | + if (bstart != au_ibstart(inode)) |
14130 | + wr_dir_args.force_btgt = au_ibstart(inode); | |
4a4d8108 AM |
14131 | + err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args); |
14132 | + if (unlikely(err < 0)) | |
14133 | + goto out; | |
14134 | + a->btgt = err; | |
14135 | + if (err != bstart) | |
14136 | + au_fset_icpup(a->flags, DID_CPUP); | |
14137 | + | |
14138 | + err = 0; | |
14139 | + a->pin_flags = AuPin_MNT_WRITE; | |
14140 | + parent = NULL; | |
14141 | + if (!IS_ROOT(dentry)) { | |
14142 | + au_fset_pin(a->pin_flags, DI_LOCKED); | |
14143 | + parent = dget_parent(dentry); | |
14144 | + di_write_lock_parent(parent); | |
14145 | + } | |
14146 | + | |
14147 | + err = au_pin(&a->pin, dentry, a->btgt, a->udba, a->pin_flags); | |
14148 | + if (unlikely(err)) | |
14149 | + goto out_parent; | |
14150 | + | |
14151 | + a->h_path.dentry = au_h_dptr(dentry, bstart); | |
14152 | + a->h_inode = a->h_path.dentry->d_inode; | |
14153 | + mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD); | |
14154 | + sz = -1; | |
14155 | + if ((ia->ia_valid & ATTR_SIZE) && ia->ia_size < i_size_read(a->h_inode)) | |
14156 | + sz = ia->ia_size; | |
14157 | + | |
14158 | + h_file = NULL; | |
14159 | + hi_wh = NULL; | |
14160 | + if (au_ftest_icpup(a->flags, DID_CPUP) && d_unhashed(dentry)) { | |
14161 | + hi_wh = au_hi_wh(inode, a->btgt); | |
14162 | + if (!hi_wh) { | |
14163 | + err = au_sio_cpup_wh(dentry, a->btgt, sz, /*file*/NULL); | |
14164 | + if (unlikely(err)) | |
14165 | + goto out_unlock; | |
14166 | + hi_wh = au_hi_wh(inode, a->btgt); | |
14167 | + /* todo: revalidate hi_wh? */ | |
14168 | + } | |
14169 | + } | |
14170 | + | |
14171 | + if (parent) { | |
14172 | + au_pin_set_parent_lflag(&a->pin, /*lflag*/0); | |
14173 | + di_downgrade_lock(parent, AuLock_IR); | |
14174 | + dput(parent); | |
14175 | + parent = NULL; | |
14176 | + } | |
14177 | + if (!au_ftest_icpup(a->flags, DID_CPUP)) | |
14178 | + goto out; /* success */ | |
14179 | + | |
14180 | + if (!d_unhashed(dentry)) { | |
14181 | + h_file = au_h_open_pre(dentry, bstart); | |
14182 | + if (IS_ERR(h_file)) { | |
14183 | + err = PTR_ERR(h_file); | |
14184 | + h_file = NULL; | |
14185 | + } else | |
14186 | + err = au_sio_cpup_simple(dentry, a->btgt, sz, | |
14187 | + AuCpup_DTIME); | |
14188 | + if (!err) | |
14189 | + a->h_path.dentry = au_h_dptr(dentry, a->btgt); | |
14190 | + } else if (!hi_wh) | |
14191 | + a->h_path.dentry = au_h_dptr(dentry, a->btgt); | |
14192 | + else | |
14193 | + a->h_path.dentry = hi_wh; /* do not dget here */ | |
1308ab2a | 14194 | + |
4f0767ce | 14195 | +out_unlock: |
4a4d8108 AM |
14196 | + mutex_unlock(&a->h_inode->i_mutex); |
14197 | + au_h_open_post(dentry, bstart, h_file); | |
14198 | + a->h_inode = a->h_path.dentry->d_inode; | |
dece6358 | 14199 | + if (!err) { |
4a4d8108 | 14200 | + mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD); |
dece6358 | 14201 | + goto out; /* success */ |
1facf9fc | 14202 | + } |
dece6358 | 14203 | + |
4a4d8108 | 14204 | + au_unpin(&a->pin); |
4f0767ce | 14205 | +out_parent: |
4a4d8108 AM |
14206 | + if (parent) { |
14207 | + di_write_unlock(parent); | |
14208 | + dput(parent); | |
14209 | + } | |
4f0767ce | 14210 | +out: |
1facf9fc | 14211 | + return err; |
14212 | +} | |
14213 | + | |
4a4d8108 | 14214 | +static int aufs_setattr(struct dentry *dentry, struct iattr *ia) |
1facf9fc | 14215 | +{ |
4a4d8108 AM |
14216 | + int err; |
14217 | + struct inode *inode; | |
14218 | + struct super_block *sb; | |
14219 | + struct file *file; | |
14220 | + struct au_icpup_args *a; | |
1facf9fc | 14221 | + |
4a4d8108 AM |
14222 | + inode = dentry->d_inode; |
14223 | + IMustLock(inode); | |
dece6358 | 14224 | + |
4a4d8108 AM |
14225 | + err = -ENOMEM; |
14226 | + a = kzalloc(sizeof(*a), GFP_NOFS); | |
14227 | + if (unlikely(!a)) | |
14228 | + goto out; | |
1facf9fc | 14229 | + |
4a4d8108 AM |
14230 | + if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
14231 | + ia->ia_valid &= ~ATTR_MODE; | |
dece6358 | 14232 | + |
4a4d8108 AM |
14233 | + file = NULL; |
14234 | + sb = dentry->d_sb; | |
953406b4 | 14235 | + si_read_lock(sb, AuLock_FLUSH); |
4a4d8108 AM |
14236 | + if (ia->ia_valid & ATTR_FILE) { |
14237 | + /* currently ftruncate(2) only */ | |
14238 | + AuDebugOn(!S_ISREG(inode->i_mode)); | |
14239 | + file = ia->ia_file; | |
14240 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1); | |
14241 | + if (unlikely(err)) | |
14242 | + goto out_si; | |
14243 | + ia->ia_file = au_hf_top(file); | |
14244 | + a->udba = AuOpt_UDBA_NONE; | |
14245 | + } else { | |
14246 | + /* fchmod() doesn't pass ia_file */ | |
14247 | + a->udba = au_opt_udba(sb); | |
14248 | + if (d_unhashed(dentry)) | |
14249 | + a->udba = AuOpt_UDBA_NONE; | |
14250 | + di_write_lock_child(dentry); | |
14251 | + if (a->udba != AuOpt_UDBA_NONE) { | |
14252 | + AuDebugOn(IS_ROOT(dentry)); | |
14253 | + err = au_reval_for_attr(dentry, au_sigen(sb)); | |
14254 | + if (unlikely(err)) | |
14255 | + goto out_dentry; | |
14256 | + } | |
dece6358 | 14257 | + } |
dece6358 | 14258 | + |
4a4d8108 AM |
14259 | + err = au_pin_and_icpup(dentry, ia, a); |
14260 | + if (unlikely(err < 0)) | |
14261 | + goto out_dentry; | |
14262 | + if (au_ftest_icpup(a->flags, DID_CPUP)) { | |
14263 | + ia->ia_file = NULL; | |
14264 | + ia->ia_valid &= ~ATTR_FILE; | |
1308ab2a | 14265 | + } |
dece6358 | 14266 | + |
4a4d8108 AM |
14267 | + a->h_path.mnt = au_sbr_mnt(sb, a->btgt); |
14268 | + if ((ia->ia_valid & (ATTR_MODE | ATTR_CTIME)) | |
14269 | + == (ATTR_MODE | ATTR_CTIME)) { | |
14270 | + err = security_path_chmod(a->h_path.dentry, a->h_path.mnt, | |
14271 | + ia->ia_mode); | |
14272 | + if (unlikely(err)) | |
14273 | + goto out_unlock; | |
14274 | + } else if ((ia->ia_valid & (ATTR_UID | ATTR_GID)) | |
14275 | + && (ia->ia_valid & ATTR_CTIME)) { | |
14276 | + err = security_path_chown(&a->h_path, ia->ia_uid, ia->ia_gid); | |
14277 | + if (unlikely(err)) | |
14278 | + goto out_unlock; | |
14279 | + } | |
dece6358 | 14280 | + |
4a4d8108 AM |
14281 | + if (ia->ia_valid & ATTR_SIZE) { |
14282 | + struct file *f; | |
1308ab2a | 14283 | + |
953406b4 | 14284 | + if (ia->ia_size < i_size_read(inode)) |
4a4d8108 | 14285 | + /* unmap only */ |
953406b4 | 14286 | + truncate_setsize(inode, ia->ia_size); |
1308ab2a | 14287 | + |
4a4d8108 AM |
14288 | + f = NULL; |
14289 | + if (ia->ia_valid & ATTR_FILE) | |
14290 | + f = ia->ia_file; | |
14291 | + mutex_unlock(&a->h_inode->i_mutex); | |
14292 | + err = vfsub_trunc(&a->h_path, ia->ia_size, ia->ia_valid, f); | |
14293 | + mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD); | |
14294 | + } else | |
14295 | + err = vfsub_notify_change(&a->h_path, ia); | |
14296 | + if (!err) | |
14297 | + au_cpup_attr_changeable(inode); | |
1308ab2a | 14298 | + |
4f0767ce | 14299 | +out_unlock: |
4a4d8108 AM |
14300 | + mutex_unlock(&a->h_inode->i_mutex); |
14301 | + au_unpin(&a->pin); | |
4f0767ce | 14302 | +out_dentry: |
4a4d8108 AM |
14303 | + di_write_unlock(dentry); |
14304 | + if (file) { | |
14305 | + fi_write_unlock(file); | |
14306 | + ia->ia_file = file; | |
14307 | + ia->ia_valid |= ATTR_FILE; | |
14308 | + } | |
4f0767ce | 14309 | +out_si: |
4a4d8108 AM |
14310 | + si_read_unlock(sb); |
14311 | + kfree(a); | |
4f0767ce | 14312 | +out: |
4a4d8108 AM |
14313 | + AuTraceErr(err); |
14314 | + return err; | |
1facf9fc | 14315 | +} |
14316 | + | |
4a4d8108 AM |
14317 | +static void au_refresh_iattr(struct inode *inode, struct kstat *st, |
14318 | + unsigned int nlink) | |
1facf9fc | 14319 | +{ |
4a4d8108 AM |
14320 | + inode->i_mode = st->mode; |
14321 | + inode->i_uid = st->uid; | |
14322 | + inode->i_gid = st->gid; | |
14323 | + inode->i_atime = st->atime; | |
14324 | + inode->i_mtime = st->mtime; | |
14325 | + inode->i_ctime = st->ctime; | |
1facf9fc | 14326 | + |
4a4d8108 AM |
14327 | + au_cpup_attr_nlink(inode, /*force*/0); |
14328 | + if (S_ISDIR(inode->i_mode)) { | |
14329 | + inode->i_nlink -= nlink; | |
14330 | + inode->i_nlink += st->nlink; | |
14331 | + } | |
1facf9fc | 14332 | + |
4a4d8108 AM |
14333 | + spin_lock(&inode->i_lock); |
14334 | + inode->i_blocks = st->blocks; | |
14335 | + i_size_write(inode, st->size); | |
14336 | + spin_unlock(&inode->i_lock); | |
1facf9fc | 14337 | +} |
14338 | + | |
4a4d8108 AM |
14339 | +static int aufs_getattr(struct vfsmount *mnt __maybe_unused, |
14340 | + struct dentry *dentry, struct kstat *st) | |
1facf9fc | 14341 | +{ |
4a4d8108 AM |
14342 | + int err; |
14343 | + unsigned int mnt_flags; | |
14344 | + aufs_bindex_t bindex; | |
14345 | + unsigned char udba_none, positive; | |
14346 | + struct super_block *sb, *h_sb; | |
14347 | + struct inode *inode; | |
14348 | + struct vfsmount *h_mnt; | |
14349 | + struct dentry *h_dentry; | |
1facf9fc | 14350 | + |
4a4d8108 AM |
14351 | + err = 0; |
14352 | + sb = dentry->d_sb; | |
14353 | + inode = dentry->d_inode; | |
953406b4 | 14354 | + si_read_lock(sb, AuLock_FLUSH); |
4a4d8108 AM |
14355 | + mnt_flags = au_mntflags(sb); |
14356 | + udba_none = !!au_opt_test(mnt_flags, UDBA_NONE); | |
1facf9fc | 14357 | + |
4a4d8108 AM |
14358 | + /* support fstat(2) */ |
14359 | + if (!d_unhashed(dentry) && !udba_none) { | |
14360 | + unsigned int sigen = au_sigen(sb); | |
14361 | + if (au_digen(dentry) == sigen && au_iigen(inode) == sigen) | |
14362 | + di_read_lock_child(dentry, AuLock_IR); | |
14363 | + else { | |
14364 | + AuDebugOn(IS_ROOT(dentry)); | |
14365 | + di_write_lock_child(dentry); | |
14366 | + err = au_reval_for_attr(dentry, sigen); | |
14367 | + di_downgrade_lock(dentry, AuLock_IR); | |
14368 | + if (unlikely(err)) | |
14369 | + goto out; | |
14370 | + } | |
14371 | + } else | |
14372 | + di_read_lock_child(dentry, AuLock_IR); | |
1facf9fc | 14373 | + |
4a4d8108 AM |
14374 | + bindex = au_ibstart(inode); |
14375 | + h_mnt = au_sbr_mnt(sb, bindex); | |
14376 | + h_sb = h_mnt->mnt_sb; | |
14377 | + if (!au_test_fs_bad_iattr(h_sb) && udba_none) | |
14378 | + goto out_fill; /* success */ | |
1facf9fc | 14379 | + |
4a4d8108 AM |
14380 | + h_dentry = NULL; |
14381 | + if (au_dbstart(dentry) == bindex) | |
14382 | + h_dentry = dget(au_h_dptr(dentry, bindex)); | |
14383 | + else if (au_opt_test(mnt_flags, PLINK) && au_plink_test(inode)) { | |
14384 | + h_dentry = au_plink_lkup(inode, bindex); | |
14385 | + if (IS_ERR(h_dentry)) | |
14386 | + goto out_fill; /* pretending success */ | |
14387 | + } | |
14388 | + /* illegally overlapped or something */ | |
14389 | + if (unlikely(!h_dentry)) | |
14390 | + goto out_fill; /* pretending success */ | |
14391 | + | |
14392 | + positive = !!h_dentry->d_inode; | |
14393 | + if (positive) | |
14394 | + err = vfs_getattr(h_mnt, h_dentry, st); | |
14395 | + dput(h_dentry); | |
14396 | + if (!err) { | |
14397 | + if (positive) | |
14398 | + au_refresh_iattr(inode, st, h_dentry->d_inode->i_nlink); | |
14399 | + goto out_fill; /* success */ | |
1facf9fc | 14400 | + } |
4a4d8108 AM |
14401 | + goto out; |
14402 | + | |
4f0767ce | 14403 | +out_fill: |
4a4d8108 | 14404 | + generic_fillattr(inode, st); |
4f0767ce | 14405 | +out: |
4a4d8108 AM |
14406 | + di_read_unlock(dentry, AuLock_IR); |
14407 | + si_read_unlock(sb); | |
14408 | + return err; | |
1facf9fc | 14409 | +} |
14410 | + | |
14411 | +/* ---------------------------------------------------------------------- */ | |
14412 | + | |
4a4d8108 AM |
14413 | +static int h_readlink(struct dentry *dentry, int bindex, char __user *buf, |
14414 | + int bufsiz) | |
1facf9fc | 14415 | +{ |
14416 | + int err; | |
4a4d8108 AM |
14417 | + struct super_block *sb; |
14418 | + struct dentry *h_dentry; | |
1facf9fc | 14419 | + |
4a4d8108 AM |
14420 | + err = -EINVAL; |
14421 | + h_dentry = au_h_dptr(dentry, bindex); | |
14422 | + if (unlikely(!h_dentry->d_inode->i_op->readlink)) | |
14423 | + goto out; | |
1facf9fc | 14424 | + |
4a4d8108 AM |
14425 | + err = security_inode_readlink(h_dentry); |
14426 | + if (unlikely(err)) | |
dece6358 | 14427 | + goto out; |
1facf9fc | 14428 | + |
4a4d8108 AM |
14429 | + sb = dentry->d_sb; |
14430 | + if (!au_test_ro(sb, bindex, dentry->d_inode)) { | |
14431 | + vfsub_touch_atime(au_sbr_mnt(sb, bindex), h_dentry); | |
14432 | + fsstack_copy_attr_atime(dentry->d_inode, h_dentry->d_inode); | |
1facf9fc | 14433 | + } |
4a4d8108 | 14434 | + err = h_dentry->d_inode->i_op->readlink(h_dentry, buf, bufsiz); |
1facf9fc | 14435 | + |
4f0767ce | 14436 | +out: |
4a4d8108 AM |
14437 | + return err; |
14438 | +} | |
1facf9fc | 14439 | + |
4a4d8108 AM |
14440 | +static int aufs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) |
14441 | +{ | |
14442 | + int err; | |
1facf9fc | 14443 | + |
4a4d8108 AM |
14444 | + aufs_read_lock(dentry, AuLock_IR); |
14445 | + err = h_readlink(dentry, au_dbstart(dentry), buf, bufsiz); | |
14446 | + aufs_read_unlock(dentry, AuLock_IR); | |
1facf9fc | 14447 | + |
4a4d8108 AM |
14448 | + return err; |
14449 | +} | |
1facf9fc | 14450 | + |
4a4d8108 AM |
14451 | +static void *aufs_follow_link(struct dentry *dentry, struct nameidata *nd) |
14452 | +{ | |
14453 | + int err; | |
4a4d8108 | 14454 | + mm_segment_t old_fs; |
b752ccd1 AM |
14455 | + union { |
14456 | + char *k; | |
14457 | + char __user *u; | |
14458 | + } buf; | |
1facf9fc | 14459 | + |
4a4d8108 | 14460 | + err = -ENOMEM; |
b752ccd1 AM |
14461 | + buf.k = __getname_gfp(GFP_NOFS); |
14462 | + if (unlikely(!buf.k)) | |
4a4d8108 | 14463 | + goto out; |
1facf9fc | 14464 | + |
4a4d8108 AM |
14465 | + aufs_read_lock(dentry, AuLock_IR); |
14466 | + old_fs = get_fs(); | |
14467 | + set_fs(KERNEL_DS); | |
b752ccd1 | 14468 | + err = h_readlink(dentry, au_dbstart(dentry), buf.u, PATH_MAX); |
4a4d8108 AM |
14469 | + set_fs(old_fs); |
14470 | + aufs_read_unlock(dentry, AuLock_IR); | |
1facf9fc | 14471 | + |
4a4d8108 | 14472 | + if (err >= 0) { |
b752ccd1 | 14473 | + buf.k[err] = 0; |
4a4d8108 | 14474 | + /* will be freed by put_link */ |
b752ccd1 | 14475 | + nd_set_link(nd, buf.k); |
4a4d8108 | 14476 | + return NULL; /* success */ |
1308ab2a | 14477 | + } |
b752ccd1 | 14478 | + __putname(buf.k); |
1facf9fc | 14479 | + |
4f0767ce | 14480 | +out: |
4a4d8108 AM |
14481 | + path_put(&nd->path); |
14482 | + AuTraceErr(err); | |
14483 | + return ERR_PTR(err); | |
14484 | +} | |
1facf9fc | 14485 | + |
4a4d8108 AM |
14486 | +static void aufs_put_link(struct dentry *dentry __maybe_unused, |
14487 | + struct nameidata *nd, void *cookie __maybe_unused) | |
14488 | +{ | |
14489 | + __putname(nd_get_link(nd)); | |
14490 | +} | |
1facf9fc | 14491 | + |
4a4d8108 | 14492 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 14493 | + |
4a4d8108 AM |
14494 | +static void aufs_truncate_range(struct inode *inode __maybe_unused, |
14495 | + loff_t start __maybe_unused, | |
14496 | + loff_t end __maybe_unused) | |
14497 | +{ | |
14498 | + AuUnsupport(); | |
14499 | +} | |
1facf9fc | 14500 | + |
4a4d8108 | 14501 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 14502 | + |
4a4d8108 AM |
14503 | +struct inode_operations aufs_symlink_iop = { |
14504 | + .permission = aufs_permission, | |
14505 | + .setattr = aufs_setattr, | |
14506 | + .getattr = aufs_getattr, | |
14507 | + .readlink = aufs_readlink, | |
14508 | + .follow_link = aufs_follow_link, | |
14509 | + .put_link = aufs_put_link | |
14510 | +}; | |
14511 | + | |
14512 | +struct inode_operations aufs_dir_iop = { | |
14513 | + .create = aufs_create, | |
14514 | + .lookup = aufs_lookup, | |
14515 | + .link = aufs_link, | |
14516 | + .unlink = aufs_unlink, | |
14517 | + .symlink = aufs_symlink, | |
14518 | + .mkdir = aufs_mkdir, | |
14519 | + .rmdir = aufs_rmdir, | |
14520 | + .mknod = aufs_mknod, | |
14521 | + .rename = aufs_rename, | |
14522 | + | |
14523 | + .permission = aufs_permission, | |
14524 | + .setattr = aufs_setattr, | |
14525 | + .getattr = aufs_getattr | |
14526 | +}; | |
14527 | + | |
14528 | +struct inode_operations aufs_iop = { | |
14529 | + .permission = aufs_permission, | |
14530 | + .setattr = aufs_setattr, | |
14531 | + .getattr = aufs_getattr, | |
14532 | + .truncate_range = aufs_truncate_range | |
14533 | +}; | |
b752ccd1 AM |
14534 | diff -urN /usr/share/empty/fs/aufs/i_op_del.c linux/fs/aufs/i_op_del.c |
14535 | --- /usr/share/empty/fs/aufs/i_op_del.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 14536 | +++ linux/fs/aufs/i_op_del.c 2010-10-21 09:52:43.090291764 +0200 |
4a4d8108 | 14537 | @@ -0,0 +1,472 @@ |
1facf9fc | 14538 | +/* |
4a4d8108 | 14539 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 14540 | + * |
14541 | + * This program, aufs is free software; you can redistribute it and/or modify | |
14542 | + * it under the terms of the GNU General Public License as published by | |
14543 | + * the Free Software Foundation; either version 2 of the License, or | |
14544 | + * (at your option) any later version. | |
dece6358 AM |
14545 | + * |
14546 | + * This program is distributed in the hope that it will be useful, | |
14547 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14548 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14549 | + * GNU General Public License for more details. | |
14550 | + * | |
14551 | + * You should have received a copy of the GNU General Public License | |
14552 | + * along with this program; if not, write to the Free Software | |
14553 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 14554 | + */ |
14555 | + | |
14556 | +/* | |
4a4d8108 | 14557 | + * inode operations (del entry) |
1308ab2a | 14558 | + */ |
dece6358 | 14559 | + |
1308ab2a | 14560 | +#include "aufs.h" |
dece6358 | 14561 | + |
4a4d8108 AM |
14562 | +/* |
14563 | + * decide if a new whiteout for @dentry is necessary or not. | |
14564 | + * when it is necessary, prepare the parent dir for the upper branch whose | |
14565 | + * branch index is @bcpup for creation. the actual creation of the whiteout will | |
14566 | + * be done by caller. | |
14567 | + * return value: | |
14568 | + * 0: wh is unnecessary | |
14569 | + * plus: wh is necessary | |
14570 | + * minus: error | |
14571 | + */ | |
14572 | +int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup) | |
1308ab2a | 14573 | +{ |
4a4d8108 AM |
14574 | + int need_wh, err; |
14575 | + aufs_bindex_t bstart; | |
14576 | + struct super_block *sb; | |
dece6358 | 14577 | + |
4a4d8108 AM |
14578 | + sb = dentry->d_sb; |
14579 | + bstart = au_dbstart(dentry); | |
14580 | + if (*bcpup < 0) { | |
14581 | + *bcpup = bstart; | |
14582 | + if (au_test_ro(sb, bstart, dentry->d_inode)) { | |
14583 | + err = AuWbrCopyup(au_sbi(sb), dentry); | |
14584 | + *bcpup = err; | |
14585 | + if (unlikely(err < 0)) | |
14586 | + goto out; | |
14587 | + } | |
14588 | + } else | |
14589 | + AuDebugOn(bstart < *bcpup | |
14590 | + || au_test_ro(sb, *bcpup, dentry->d_inode)); | |
14591 | + AuDbg("bcpup %d, bstart %d\n", *bcpup, bstart); | |
1308ab2a | 14592 | + |
4a4d8108 AM |
14593 | + if (*bcpup != bstart) { |
14594 | + err = au_cpup_dirs(dentry, *bcpup); | |
14595 | + if (unlikely(err)) | |
14596 | + goto out; | |
14597 | + need_wh = 1; | |
14598 | + } else { | |
14599 | + aufs_bindex_t old_bend, new_bend, bdiropq = -1; | |
14600 | + | |
14601 | + old_bend = au_dbend(dentry); | |
14602 | + if (isdir) { | |
14603 | + bdiropq = au_dbdiropq(dentry); | |
14604 | + au_set_dbdiropq(dentry, -1); | |
14605 | + } | |
14606 | + need_wh = au_lkup_dentry(dentry, bstart + 1, /*type*/0, | |
14607 | + /*nd*/NULL); | |
14608 | + err = need_wh; | |
14609 | + if (isdir) | |
14610 | + au_set_dbdiropq(dentry, bdiropq); | |
14611 | + if (unlikely(err < 0)) | |
14612 | + goto out; | |
14613 | + new_bend = au_dbend(dentry); | |
14614 | + if (!need_wh && old_bend != new_bend) { | |
14615 | + au_set_h_dptr(dentry, new_bend, NULL); | |
14616 | + au_set_dbend(dentry, old_bend); | |
14617 | + } | |
14618 | + } | |
14619 | + AuDbg("need_wh %d\n", need_wh); | |
14620 | + err = need_wh; | |
14621 | + | |
4f0767ce | 14622 | +out: |
4a4d8108 | 14623 | + return err; |
1facf9fc | 14624 | +} |
14625 | + | |
4a4d8108 AM |
14626 | +/* |
14627 | + * simple tests for the del-entry operations. | |
14628 | + * following the checks in vfs, plus the parent-child relationship. | |
14629 | + */ | |
14630 | +int au_may_del(struct dentry *dentry, aufs_bindex_t bindex, | |
14631 | + struct dentry *h_parent, int isdir) | |
1facf9fc | 14632 | +{ |
4a4d8108 AM |
14633 | + int err; |
14634 | + umode_t h_mode; | |
14635 | + struct dentry *h_dentry, *h_latest; | |
1308ab2a | 14636 | + struct inode *h_inode; |
1facf9fc | 14637 | + |
4a4d8108 AM |
14638 | + h_dentry = au_h_dptr(dentry, bindex); |
14639 | + h_inode = h_dentry->d_inode; | |
14640 | + if (dentry->d_inode) { | |
14641 | + err = -ENOENT; | |
14642 | + if (unlikely(!h_inode || !h_inode->i_nlink)) | |
14643 | + goto out; | |
1facf9fc | 14644 | + |
4a4d8108 AM |
14645 | + h_mode = h_inode->i_mode; |
14646 | + if (!isdir) { | |
14647 | + err = -EISDIR; | |
14648 | + if (unlikely(S_ISDIR(h_mode))) | |
14649 | + goto out; | |
14650 | + } else if (unlikely(!S_ISDIR(h_mode))) { | |
14651 | + err = -ENOTDIR; | |
14652 | + goto out; | |
14653 | + } | |
14654 | + } else { | |
14655 | + /* rename(2) case */ | |
14656 | + err = -EIO; | |
14657 | + if (unlikely(h_inode)) | |
14658 | + goto out; | |
14659 | + } | |
1facf9fc | 14660 | + |
4a4d8108 AM |
14661 | + err = -ENOENT; |
14662 | + /* expected parent dir is locked */ | |
14663 | + if (unlikely(h_parent != h_dentry->d_parent)) | |
14664 | + goto out; | |
14665 | + err = 0; | |
14666 | + | |
14667 | + /* | |
14668 | + * rmdir a dir may break the consistency on some filesystem. | |
14669 | + * let's try heavy test. | |
14670 | + */ | |
14671 | + err = -EACCES; | |
14672 | + if (unlikely(au_test_h_perm(h_parent->d_inode, MAY_EXEC | MAY_WRITE))) | |
14673 | + goto out; | |
14674 | + | |
14675 | + h_latest = au_sio_lkup_one(&dentry->d_name, h_parent, | |
14676 | + au_sbr(dentry->d_sb, bindex)); | |
14677 | + err = -EIO; | |
14678 | + if (IS_ERR(h_latest)) | |
14679 | + goto out; | |
14680 | + if (h_latest == h_dentry) | |
14681 | + err = 0; | |
14682 | + dput(h_latest); | |
14683 | + | |
4f0767ce | 14684 | +out: |
4a4d8108 | 14685 | + return err; |
1308ab2a | 14686 | +} |
1facf9fc | 14687 | + |
4a4d8108 AM |
14688 | +/* |
14689 | + * decide the branch where we operate for @dentry. the branch index will be set | |
14690 | + * @rbcpup. after diciding it, 'pin' it and store the timestamps of the parent | |
14691 | + * dir for reverting. | |
14692 | + * when a new whiteout is necessary, create it. | |
14693 | + */ | |
14694 | +static struct dentry* | |
14695 | +lock_hdir_create_wh(struct dentry *dentry, int isdir, aufs_bindex_t *rbcpup, | |
14696 | + struct au_dtime *dt, struct au_pin *pin) | |
1308ab2a | 14697 | +{ |
4a4d8108 AM |
14698 | + struct dentry *wh_dentry; |
14699 | + struct super_block *sb; | |
14700 | + struct path h_path; | |
14701 | + int err, need_wh; | |
14702 | + unsigned int udba; | |
14703 | + aufs_bindex_t bcpup; | |
dece6358 | 14704 | + |
4a4d8108 AM |
14705 | + need_wh = au_wr_dir_need_wh(dentry, isdir, rbcpup); |
14706 | + wh_dentry = ERR_PTR(need_wh); | |
14707 | + if (unlikely(need_wh < 0)) | |
14708 | + goto out; | |
14709 | + | |
14710 | + sb = dentry->d_sb; | |
14711 | + udba = au_opt_udba(sb); | |
14712 | + bcpup = *rbcpup; | |
14713 | + err = au_pin(pin, dentry, bcpup, udba, | |
14714 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
14715 | + wh_dentry = ERR_PTR(err); | |
14716 | + if (unlikely(err)) | |
14717 | + goto out; | |
14718 | + | |
14719 | + h_path.dentry = au_pinned_h_parent(pin); | |
14720 | + if (udba != AuOpt_UDBA_NONE | |
14721 | + && au_dbstart(dentry) == bcpup) { | |
14722 | + err = au_may_del(dentry, bcpup, h_path.dentry, isdir); | |
14723 | + wh_dentry = ERR_PTR(err); | |
14724 | + if (unlikely(err)) | |
14725 | + goto out_unpin; | |
14726 | + } | |
14727 | + | |
14728 | + h_path.mnt = au_sbr_mnt(sb, bcpup); | |
14729 | + au_dtime_store(dt, au_pinned_parent(pin), &h_path); | |
14730 | + wh_dentry = NULL; | |
14731 | + if (!need_wh) | |
14732 | + goto out; /* success, no need to create whiteout */ | |
14733 | + | |
14734 | + wh_dentry = au_wh_create(dentry, bcpup, h_path.dentry); | |
14735 | + if (IS_ERR(wh_dentry)) | |
14736 | + goto out_unpin; | |
14737 | + | |
14738 | + /* returns with the parent is locked and wh_dentry is dget-ed */ | |
14739 | + goto out; /* success */ | |
14740 | + | |
4f0767ce | 14741 | +out_unpin: |
4a4d8108 | 14742 | + au_unpin(pin); |
4f0767ce | 14743 | +out: |
4a4d8108 | 14744 | + return wh_dentry; |
1facf9fc | 14745 | +} |
14746 | + | |
4a4d8108 AM |
14747 | +/* |
14748 | + * when removing a dir, rename it to a unique temporary whiteout-ed name first | |
14749 | + * in order to be revertible and save time for removing many child whiteouts | |
14750 | + * under the dir. | |
14751 | + * returns 1 when there are too many child whiteout and caller should remove | |
14752 | + * them asynchronously. returns 0 when the number of children is enough small to | |
14753 | + * remove now or the branch fs is a remote fs. | |
14754 | + * otherwise return an error. | |
14755 | + */ | |
14756 | +static int renwh_and_rmdir(struct dentry *dentry, aufs_bindex_t bindex, | |
14757 | + struct au_nhash *whlist, struct inode *dir) | |
1facf9fc | 14758 | +{ |
4a4d8108 AM |
14759 | + int rmdir_later, err, dirwh; |
14760 | + struct dentry *h_dentry; | |
14761 | + struct super_block *sb; | |
14762 | + | |
14763 | + sb = dentry->d_sb; | |
14764 | + SiMustAnyLock(sb); | |
14765 | + h_dentry = au_h_dptr(dentry, bindex); | |
14766 | + err = au_whtmp_ren(h_dentry, au_sbr(sb, bindex)); | |
14767 | + if (unlikely(err)) | |
14768 | + goto out; | |
14769 | + | |
14770 | + /* stop monitoring */ | |
14771 | + au_hn_free(au_hi(dentry->d_inode, bindex)); | |
14772 | + | |
14773 | + if (!au_test_fs_remote(h_dentry->d_sb)) { | |
14774 | + dirwh = au_sbi(sb)->si_dirwh; | |
14775 | + rmdir_later = (dirwh <= 1); | |
14776 | + if (!rmdir_later) | |
14777 | + rmdir_later = au_nhash_test_longer_wh(whlist, bindex, | |
14778 | + dirwh); | |
14779 | + if (rmdir_later) | |
14780 | + return rmdir_later; | |
14781 | + } | |
1facf9fc | 14782 | + |
4a4d8108 AM |
14783 | + err = au_whtmp_rmdir(dir, bindex, h_dentry, whlist); |
14784 | + if (unlikely(err)) { | |
14785 | + AuIOErr("rmdir %.*s, b%d failed, %d. ignored\n", | |
14786 | + AuDLNPair(h_dentry), bindex, err); | |
14787 | + err = 0; | |
14788 | + } | |
dece6358 | 14789 | + |
4f0767ce | 14790 | +out: |
4a4d8108 AM |
14791 | + AuTraceErr(err); |
14792 | + return err; | |
14793 | +} | |
1308ab2a | 14794 | + |
4a4d8108 AM |
14795 | +/* |
14796 | + * final procedure for deleting a entry. | |
14797 | + * maintain dentry and iattr. | |
14798 | + */ | |
14799 | +static void epilog(struct inode *dir, struct dentry *dentry, | |
14800 | + aufs_bindex_t bindex) | |
14801 | +{ | |
14802 | + struct inode *inode; | |
1308ab2a | 14803 | + |
4a4d8108 AM |
14804 | + inode = dentry->d_inode; |
14805 | + d_drop(dentry); | |
14806 | + inode->i_ctime = dir->i_ctime; | |
1308ab2a | 14807 | + |
4a4d8108 AM |
14808 | + if (atomic_read(&dentry->d_count) == 1) { |
14809 | + au_set_h_dptr(dentry, au_dbstart(dentry), NULL); | |
14810 | + au_update_dbstart(dentry); | |
dece6358 | 14811 | + } |
4a4d8108 AM |
14812 | + if (au_ibstart(dir) == bindex) |
14813 | + au_cpup_attr_timesizes(dir); | |
14814 | + dir->i_version++; | |
1facf9fc | 14815 | +} |
14816 | + | |
4a4d8108 AM |
14817 | +/* |
14818 | + * when an error happened, remove the created whiteout and revert everything. | |
14819 | + */ | |
14820 | +static int do_revert(int err, struct inode *dir, aufs_bindex_t bwh, | |
14821 | + struct dentry *wh_dentry, struct dentry *dentry, | |
14822 | + struct au_dtime *dt) | |
1facf9fc | 14823 | +{ |
4a4d8108 AM |
14824 | + int rerr; |
14825 | + struct path h_path = { | |
14826 | + .dentry = wh_dentry, | |
14827 | + .mnt = au_sbr_mnt(dir->i_sb, bwh) | |
14828 | + }; | |
dece6358 | 14829 | + |
4a4d8108 AM |
14830 | + rerr = au_wh_unlink_dentry(au_h_iptr(dir, bwh), &h_path, dentry); |
14831 | + if (!rerr) { | |
14832 | + au_set_dbwh(dentry, bwh); | |
14833 | + au_dtime_revert(dt); | |
14834 | + return 0; | |
14835 | + } | |
dece6358 | 14836 | + |
4a4d8108 AM |
14837 | + AuIOErr("%.*s reverting whiteout failed(%d, %d)\n", |
14838 | + AuDLNPair(dentry), err, rerr); | |
14839 | + return -EIO; | |
1facf9fc | 14840 | +} |
14841 | + | |
4a4d8108 | 14842 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 14843 | + |
4a4d8108 | 14844 | +int aufs_unlink(struct inode *dir, struct dentry *dentry) |
1308ab2a | 14845 | +{ |
4a4d8108 AM |
14846 | + int err; |
14847 | + aufs_bindex_t bwh, bindex, bstart; | |
14848 | + struct au_dtime dt; | |
14849 | + struct au_pin pin; | |
14850 | + struct path h_path; | |
14851 | + struct inode *inode, *h_dir; | |
14852 | + struct dentry *parent, *wh_dentry; | |
1facf9fc | 14853 | + |
4a4d8108 AM |
14854 | + IMustLock(dir); |
14855 | + inode = dentry->d_inode; | |
14856 | + if (unlikely(!inode)) | |
14857 | + return -ENOENT; /* possible? */ | |
14858 | + IMustLock(inode); | |
1facf9fc | 14859 | + |
4a4d8108 AM |
14860 | + aufs_read_lock(dentry, AuLock_DW); |
14861 | + parent = dentry->d_parent; /* dir inode is locked */ | |
14862 | + di_write_lock_parent(parent); | |
1facf9fc | 14863 | + |
4a4d8108 AM |
14864 | + bstart = au_dbstart(dentry); |
14865 | + bwh = au_dbwh(dentry); | |
14866 | + bindex = -1; | |
14867 | + wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &dt, &pin); | |
14868 | + err = PTR_ERR(wh_dentry); | |
14869 | + if (IS_ERR(wh_dentry)) | |
14870 | + goto out; | |
1facf9fc | 14871 | + |
4a4d8108 AM |
14872 | + h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart); |
14873 | + h_path.dentry = au_h_dptr(dentry, bstart); | |
14874 | + dget(h_path.dentry); | |
14875 | + if (bindex == bstart) { | |
14876 | + h_dir = au_pinned_h_dir(&pin); | |
14877 | + err = vfsub_unlink(h_dir, &h_path, /*force*/0); | |
14878 | + } else { | |
14879 | + /* dir inode is locked */ | |
14880 | + h_dir = wh_dentry->d_parent->d_inode; | |
14881 | + IMustLock(h_dir); | |
14882 | + err = 0; | |
14883 | + } | |
dece6358 | 14884 | + |
4a4d8108 AM |
14885 | + if (!err) { |
14886 | + drop_nlink(inode); | |
14887 | + epilog(dir, dentry, bindex); | |
14888 | + | |
14889 | + /* update target timestamps */ | |
14890 | + if (bindex == bstart) { | |
14891 | + vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/ | |
14892 | + inode->i_ctime = h_path.dentry->d_inode->i_ctime; | |
14893 | + } else | |
14894 | + /* todo: this timestamp may be reverted later */ | |
14895 | + inode->i_ctime = h_dir->i_ctime; | |
14896 | + goto out_unlock; /* success */ | |
1facf9fc | 14897 | + } |
14898 | + | |
4a4d8108 AM |
14899 | + /* revert */ |
14900 | + if (wh_dentry) { | |
14901 | + int rerr; | |
14902 | + | |
14903 | + rerr = do_revert(err, dir, bwh, wh_dentry, dentry, &dt); | |
14904 | + if (rerr) | |
14905 | + err = rerr; | |
dece6358 | 14906 | + } |
1facf9fc | 14907 | + |
4f0767ce | 14908 | +out_unlock: |
4a4d8108 AM |
14909 | + au_unpin(&pin); |
14910 | + dput(wh_dentry); | |
14911 | + dput(h_path.dentry); | |
4f0767ce | 14912 | +out: |
4a4d8108 AM |
14913 | + di_write_unlock(parent); |
14914 | + aufs_read_unlock(dentry, AuLock_DW); | |
14915 | + return err; | |
dece6358 AM |
14916 | +} |
14917 | + | |
4a4d8108 | 14918 | +int aufs_rmdir(struct inode *dir, struct dentry *dentry) |
1308ab2a | 14919 | +{ |
4a4d8108 AM |
14920 | + int err, rmdir_later; |
14921 | + aufs_bindex_t bwh, bindex, bstart; | |
14922 | + struct au_dtime dt; | |
14923 | + struct au_pin pin; | |
14924 | + struct inode *inode; | |
14925 | + struct dentry *parent, *wh_dentry, *h_dentry; | |
14926 | + struct au_whtmp_rmdir *args; | |
1facf9fc | 14927 | + |
4a4d8108 AM |
14928 | + IMustLock(dir); |
14929 | + inode = dentry->d_inode; | |
14930 | + err = -ENOENT; /* possible? */ | |
14931 | + if (unlikely(!inode)) | |
14932 | + goto out; | |
14933 | + IMustLock(inode); | |
dece6358 | 14934 | + |
4a4d8108 AM |
14935 | + aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH); |
14936 | + err = -ENOMEM; | |
14937 | + args = au_whtmp_rmdir_alloc(dir->i_sb, GFP_NOFS); | |
14938 | + if (unlikely(!args)) | |
14939 | + goto out_unlock; | |
dece6358 | 14940 | + |
4a4d8108 AM |
14941 | + parent = dentry->d_parent; /* dir inode is locked */ |
14942 | + di_write_lock_parent(parent); | |
14943 | + err = au_test_empty(dentry, &args->whlist); | |
14944 | + if (unlikely(err)) | |
14945 | + goto out_args; | |
1facf9fc | 14946 | + |
4a4d8108 AM |
14947 | + bstart = au_dbstart(dentry); |
14948 | + bwh = au_dbwh(dentry); | |
14949 | + bindex = -1; | |
14950 | + wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/1, &bindex, &dt, &pin); | |
14951 | + err = PTR_ERR(wh_dentry); | |
14952 | + if (IS_ERR(wh_dentry)) | |
14953 | + goto out_args; | |
1facf9fc | 14954 | + |
4a4d8108 AM |
14955 | + h_dentry = au_h_dptr(dentry, bstart); |
14956 | + dget(h_dentry); | |
14957 | + rmdir_later = 0; | |
14958 | + if (bindex == bstart) { | |
14959 | + err = renwh_and_rmdir(dentry, bstart, &args->whlist, dir); | |
14960 | + if (err > 0) { | |
14961 | + rmdir_later = err; | |
14962 | + err = 0; | |
14963 | + } | |
14964 | + } else { | |
14965 | + /* stop monitoring */ | |
14966 | + au_hn_free(au_hi(inode, bstart)); | |
14967 | + | |
14968 | + /* dir inode is locked */ | |
14969 | + IMustLock(wh_dentry->d_parent->d_inode); | |
1facf9fc | 14970 | + err = 0; |
14971 | + } | |
14972 | + | |
4a4d8108 AM |
14973 | + if (!err) { |
14974 | + clear_nlink(inode); | |
14975 | + au_set_dbdiropq(dentry, -1); | |
14976 | + epilog(dir, dentry, bindex); | |
1308ab2a | 14977 | + |
4a4d8108 AM |
14978 | + if (rmdir_later) { |
14979 | + au_whtmp_kick_rmdir(dir, bstart, h_dentry, args); | |
14980 | + args = NULL; | |
14981 | + } | |
1308ab2a | 14982 | + |
4a4d8108 | 14983 | + goto out_unpin; /* success */ |
1facf9fc | 14984 | + } |
14985 | + | |
4a4d8108 AM |
14986 | + /* revert */ |
14987 | + AuLabel(revert); | |
14988 | + if (wh_dentry) { | |
14989 | + int rerr; | |
1308ab2a | 14990 | + |
4a4d8108 AM |
14991 | + rerr = do_revert(err, dir, bwh, wh_dentry, dentry, &dt); |
14992 | + if (rerr) | |
14993 | + err = rerr; | |
1facf9fc | 14994 | + } |
14995 | + | |
4f0767ce | 14996 | +out_unpin: |
4a4d8108 AM |
14997 | + au_unpin(&pin); |
14998 | + dput(wh_dentry); | |
14999 | + dput(h_dentry); | |
4f0767ce | 15000 | +out_args: |
4a4d8108 AM |
15001 | + di_write_unlock(parent); |
15002 | + if (args) | |
15003 | + au_whtmp_rmdir_free(args); | |
4f0767ce | 15004 | +out_unlock: |
4a4d8108 | 15005 | + aufs_read_unlock(dentry, AuLock_DW); |
4f0767ce | 15006 | +out: |
4a4d8108 AM |
15007 | + AuTraceErr(err); |
15008 | + return err; | |
dece6358 | 15009 | +} |
b752ccd1 AM |
15010 | diff -urN /usr/share/empty/fs/aufs/i_op_ren.c linux/fs/aufs/i_op_ren.c |
15011 | --- /usr/share/empty/fs/aufs/i_op_ren.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
15012 | +++ linux/fs/aufs/i_op_ren.c 2010-10-21 09:52:43.090291764 +0200 |
15013 | @@ -0,0 +1,977 @@ | |
1facf9fc | 15014 | +/* |
4a4d8108 | 15015 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 15016 | + * |
15017 | + * This program, aufs is free software; you can redistribute it and/or modify | |
15018 | + * it under the terms of the GNU General Public License as published by | |
15019 | + * the Free Software Foundation; either version 2 of the License, or | |
15020 | + * (at your option) any later version. | |
dece6358 AM |
15021 | + * |
15022 | + * This program is distributed in the hope that it will be useful, | |
15023 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15024 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15025 | + * GNU General Public License for more details. | |
15026 | + * | |
15027 | + * You should have received a copy of the GNU General Public License | |
15028 | + * along with this program; if not, write to the Free Software | |
15029 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 15030 | + */ |
15031 | + | |
15032 | +/* | |
4a4d8108 AM |
15033 | + * inode operation (rename entry) |
15034 | + * todo: this is crazy monster | |
1facf9fc | 15035 | + */ |
15036 | + | |
15037 | +#include "aufs.h" | |
15038 | + | |
4a4d8108 AM |
15039 | +enum { AuSRC, AuDST, AuSrcDst }; |
15040 | +enum { AuPARENT, AuCHILD, AuParentChild }; | |
1facf9fc | 15041 | + |
4a4d8108 AM |
15042 | +#define AuRen_ISDIR 1 |
15043 | +#define AuRen_ISSAMEDIR (1 << 1) | |
15044 | +#define AuRen_WHSRC (1 << 2) | |
15045 | +#define AuRen_WHDST (1 << 3) | |
15046 | +#define AuRen_MNT_WRITE (1 << 4) | |
15047 | +#define AuRen_DT_DSTDIR (1 << 5) | |
15048 | +#define AuRen_DIROPQ (1 << 6) | |
15049 | +#define AuRen_CPUP (1 << 7) | |
15050 | +#define au_ftest_ren(flags, name) ((flags) & AuRen_##name) | |
15051 | +#define au_fset_ren(flags, name) { (flags) |= AuRen_##name; } | |
15052 | +#define au_fclr_ren(flags, name) { (flags) &= ~AuRen_##name; } | |
1facf9fc | 15053 | + |
4a4d8108 AM |
15054 | +struct au_ren_args { |
15055 | + struct { | |
15056 | + struct dentry *dentry, *h_dentry, *parent, *h_parent, | |
15057 | + *wh_dentry; | |
15058 | + struct inode *dir, *inode; | |
15059 | + struct au_hinode *hdir; | |
15060 | + struct au_dtime dt[AuParentChild]; | |
15061 | + aufs_bindex_t bstart; | |
15062 | + } sd[AuSrcDst]; | |
1facf9fc | 15063 | + |
4a4d8108 AM |
15064 | +#define src_dentry sd[AuSRC].dentry |
15065 | +#define src_dir sd[AuSRC].dir | |
15066 | +#define src_inode sd[AuSRC].inode | |
15067 | +#define src_h_dentry sd[AuSRC].h_dentry | |
15068 | +#define src_parent sd[AuSRC].parent | |
15069 | +#define src_h_parent sd[AuSRC].h_parent | |
15070 | +#define src_wh_dentry sd[AuSRC].wh_dentry | |
15071 | +#define src_hdir sd[AuSRC].hdir | |
15072 | +#define src_h_dir sd[AuSRC].hdir->hi_inode | |
15073 | +#define src_dt sd[AuSRC].dt | |
15074 | +#define src_bstart sd[AuSRC].bstart | |
1facf9fc | 15075 | + |
4a4d8108 AM |
15076 | +#define dst_dentry sd[AuDST].dentry |
15077 | +#define dst_dir sd[AuDST].dir | |
15078 | +#define dst_inode sd[AuDST].inode | |
15079 | +#define dst_h_dentry sd[AuDST].h_dentry | |
15080 | +#define dst_parent sd[AuDST].parent | |
15081 | +#define dst_h_parent sd[AuDST].h_parent | |
15082 | +#define dst_wh_dentry sd[AuDST].wh_dentry | |
15083 | +#define dst_hdir sd[AuDST].hdir | |
15084 | +#define dst_h_dir sd[AuDST].hdir->hi_inode | |
15085 | +#define dst_dt sd[AuDST].dt | |
15086 | +#define dst_bstart sd[AuDST].bstart | |
15087 | + | |
15088 | + struct dentry *h_trap; | |
15089 | + struct au_branch *br; | |
15090 | + struct au_hinode *src_hinode; | |
15091 | + struct path h_path; | |
15092 | + struct au_nhash whlist; | |
15093 | + aufs_bindex_t btgt; | |
1facf9fc | 15094 | + |
1308ab2a | 15095 | + unsigned int flags; |
1facf9fc | 15096 | + |
4a4d8108 AM |
15097 | + struct au_whtmp_rmdir *thargs; |
15098 | + struct dentry *h_dst; | |
15099 | +}; | |
1308ab2a | 15100 | + |
4a4d8108 | 15101 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 15102 | + |
4a4d8108 AM |
15103 | +/* |
15104 | + * functions for reverting. | |
15105 | + * when an error happened in a single rename systemcall, we should revert | |
15106 | + * everything as if nothing happend. | |
15107 | + * we don't need to revert the copied-up/down the parent dir since they are | |
15108 | + * harmless. | |
15109 | + */ | |
1facf9fc | 15110 | + |
4a4d8108 AM |
15111 | +#define RevertFailure(fmt, ...) do { \ |
15112 | + AuIOErr("revert failure: " fmt " (%d, %d)\n", \ | |
15113 | + ##__VA_ARGS__, err, rerr); \ | |
15114 | + err = -EIO; \ | |
15115 | +} while (0) | |
1facf9fc | 15116 | + |
4a4d8108 | 15117 | +static void au_ren_rev_diropq(int err, struct au_ren_args *a) |
1facf9fc | 15118 | +{ |
4a4d8108 | 15119 | + int rerr; |
1facf9fc | 15120 | + |
4a4d8108 AM |
15121 | + au_hn_imtx_lock_nested(a->src_hinode, AuLsc_I_CHILD); |
15122 | + rerr = au_diropq_remove(a->src_dentry, a->btgt); | |
15123 | + au_hn_imtx_unlock(a->src_hinode); | |
15124 | + if (rerr) | |
15125 | + RevertFailure("remove diropq %.*s", AuDLNPair(a->src_dentry)); | |
15126 | +} | |
1facf9fc | 15127 | + |
4a4d8108 AM |
15128 | +static void au_ren_rev_rename(int err, struct au_ren_args *a) |
15129 | +{ | |
15130 | + int rerr; | |
1facf9fc | 15131 | + |
4a4d8108 AM |
15132 | + a->h_path.dentry = au_lkup_one(&a->src_dentry->d_name, a->src_h_parent, |
15133 | + a->br, /*nd*/NULL); | |
15134 | + rerr = PTR_ERR(a->h_path.dentry); | |
15135 | + if (IS_ERR(a->h_path.dentry)) { | |
15136 | + RevertFailure("au_lkup_one %.*s", AuDLNPair(a->src_dentry)); | |
15137 | + return; | |
1facf9fc | 15138 | + } |
15139 | + | |
4a4d8108 AM |
15140 | + rerr = vfsub_rename(a->dst_h_dir, |
15141 | + au_h_dptr(a->src_dentry, a->btgt), | |
15142 | + a->src_h_dir, &a->h_path); | |
15143 | + d_drop(a->h_path.dentry); | |
15144 | + dput(a->h_path.dentry); | |
15145 | + /* au_set_h_dptr(a->src_dentry, a->btgt, NULL); */ | |
15146 | + if (rerr) | |
15147 | + RevertFailure("rename %.*s", AuDLNPair(a->src_dentry)); | |
1facf9fc | 15148 | +} |
15149 | + | |
4a4d8108 | 15150 | +static void au_ren_rev_cpup(int err, struct au_ren_args *a) |
1facf9fc | 15151 | +{ |
4a4d8108 | 15152 | + int rerr; |
1facf9fc | 15153 | + |
4a4d8108 AM |
15154 | + a->h_path.dentry = a->dst_h_dentry; |
15155 | + rerr = vfsub_unlink(a->dst_h_dir, &a->h_path, /*force*/0); | |
15156 | + au_set_h_dptr(a->src_dentry, a->btgt, NULL); | |
15157 | + au_set_dbstart(a->src_dentry, a->src_bstart); | |
15158 | + if (rerr) | |
15159 | + RevertFailure("unlink %.*s", AuDLNPair(a->dst_h_dentry)); | |
1facf9fc | 15160 | +} |
15161 | + | |
4a4d8108 | 15162 | +static void au_ren_rev_whtmp(int err, struct au_ren_args *a) |
1facf9fc | 15163 | +{ |
4a4d8108 | 15164 | + int rerr; |
dece6358 | 15165 | + |
4a4d8108 AM |
15166 | + a->h_path.dentry = au_lkup_one(&a->dst_dentry->d_name, a->dst_h_parent, |
15167 | + a->br, /*nd*/NULL); | |
15168 | + rerr = PTR_ERR(a->h_path.dentry); | |
15169 | + if (IS_ERR(a->h_path.dentry)) { | |
15170 | + RevertFailure("lookup %.*s", AuDLNPair(a->dst_dentry)); | |
15171 | + return; | |
15172 | + } | |
15173 | + if (a->h_path.dentry->d_inode) { | |
15174 | + d_drop(a->h_path.dentry); | |
15175 | + dput(a->h_path.dentry); | |
15176 | + return; | |
dece6358 AM |
15177 | + } |
15178 | + | |
4a4d8108 AM |
15179 | + rerr = vfsub_rename(a->dst_h_dir, a->h_dst, a->dst_h_dir, &a->h_path); |
15180 | + d_drop(a->h_path.dentry); | |
15181 | + dput(a->h_path.dentry); | |
15182 | + if (!rerr) | |
15183 | + au_set_h_dptr(a->dst_dentry, a->btgt, dget(a->h_dst)); | |
15184 | + else | |
15185 | + RevertFailure("rename %.*s", AuDLNPair(a->h_dst)); | |
15186 | +} | |
1308ab2a | 15187 | + |
4a4d8108 AM |
15188 | +static void au_ren_rev_whsrc(int err, struct au_ren_args *a) |
15189 | +{ | |
15190 | + int rerr; | |
1308ab2a | 15191 | + |
4a4d8108 AM |
15192 | + a->h_path.dentry = a->src_wh_dentry; |
15193 | + rerr = au_wh_unlink_dentry(a->src_h_dir, &a->h_path, a->src_dentry); | |
15194 | + if (rerr) | |
15195 | + RevertFailure("unlink %.*s", AuDLNPair(a->src_wh_dentry)); | |
15196 | +} | |
1308ab2a | 15197 | + |
4a4d8108 AM |
15198 | +static void au_ren_rev_drop(struct au_ren_args *a) |
15199 | +{ | |
15200 | + struct dentry *d, *h_d; | |
15201 | + int i; | |
15202 | + aufs_bindex_t bend, bindex; | |
15203 | + | |
15204 | + for (i = 0; i < AuSrcDst; i++) { | |
15205 | + d = a->sd[i].dentry; | |
15206 | + d_drop(d); | |
15207 | + bend = au_dbend(d); | |
15208 | + for (bindex = au_dbstart(d); bindex <= bend; bindex++) { | |
15209 | + h_d = au_h_dptr(d, bindex); | |
15210 | + if (h_d) | |
15211 | + d_drop(h_d); | |
15212 | + } | |
1308ab2a | 15213 | + } |
15214 | + | |
4a4d8108 AM |
15215 | + au_update_dbstart(a->dst_dentry); |
15216 | + if (a->thargs) | |
15217 | + d_drop(a->h_dst); | |
1facf9fc | 15218 | +} |
4a4d8108 | 15219 | +#undef RevertFailure |
1facf9fc | 15220 | + |
1308ab2a | 15221 | +/* ---------------------------------------------------------------------- */ |
15222 | + | |
4a4d8108 AM |
15223 | +/* |
15224 | + * when we have to copyup the renaming entry, do it with the rename-target name | |
15225 | + * in order to minimize the cost (the later actual rename is unnecessary). | |
15226 | + * otherwise rename it on the target branch. | |
15227 | + */ | |
15228 | +static int au_ren_or_cpup(struct au_ren_args *a) | |
1facf9fc | 15229 | +{ |
dece6358 | 15230 | + int err; |
4a4d8108 | 15231 | + struct dentry *d; |
1facf9fc | 15232 | + |
4a4d8108 AM |
15233 | + d = a->src_dentry; |
15234 | + if (au_dbstart(d) == a->btgt) { | |
15235 | + a->h_path.dentry = a->dst_h_dentry; | |
15236 | + if (au_ftest_ren(a->flags, DIROPQ) | |
15237 | + && au_dbdiropq(d) == a->btgt) | |
15238 | + au_fclr_ren(a->flags, DIROPQ); | |
15239 | + AuDebugOn(au_dbstart(d) != a->btgt); | |
15240 | + err = vfsub_rename(a->src_h_dir, au_h_dptr(d, a->btgt), | |
15241 | + a->dst_h_dir, &a->h_path); | |
15242 | + } else { | |
15243 | + struct mutex *h_mtx = &a->src_h_dentry->d_inode->i_mutex; | |
15244 | + struct file *h_file; | |
1308ab2a | 15245 | + |
4a4d8108 AM |
15246 | + au_fset_ren(a->flags, CPUP); |
15247 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); | |
15248 | + au_set_dbstart(d, a->btgt); | |
15249 | + au_set_h_dptr(d, a->btgt, dget(a->dst_h_dentry)); | |
15250 | + h_file = au_h_open_pre(d, a->src_bstart); | |
15251 | + if (IS_ERR(h_file)) { | |
15252 | + err = PTR_ERR(h_file); | |
15253 | + h_file = NULL; | |
15254 | + } else | |
15255 | + err = au_sio_cpup_single(d, a->btgt, a->src_bstart, -1, | |
15256 | + !AuCpup_DTIME, a->dst_parent); | |
15257 | + mutex_unlock(h_mtx); | |
15258 | + au_h_open_post(d, a->src_bstart, h_file); | |
15259 | + if (!err) { | |
15260 | + d = a->dst_dentry; | |
15261 | + au_set_h_dptr(d, a->btgt, NULL); | |
15262 | + au_update_dbstart(d); | |
15263 | + } else { | |
15264 | + au_set_h_dptr(d, a->btgt, NULL); | |
15265 | + au_set_dbstart(d, a->src_bstart); | |
15266 | + } | |
1308ab2a | 15267 | + } |
1facf9fc | 15268 | + |
dece6358 AM |
15269 | + return err; |
15270 | +} | |
1facf9fc | 15271 | + |
4a4d8108 AM |
15272 | +/* cf. aufs_rmdir() */ |
15273 | +static int au_ren_del_whtmp(struct au_ren_args *a) | |
dece6358 | 15274 | +{ |
4a4d8108 AM |
15275 | + int err; |
15276 | + struct inode *dir; | |
1facf9fc | 15277 | + |
4a4d8108 AM |
15278 | + dir = a->dst_dir; |
15279 | + SiMustAnyLock(dir->i_sb); | |
15280 | + if (!au_nhash_test_longer_wh(&a->whlist, a->btgt, | |
15281 | + au_sbi(dir->i_sb)->si_dirwh) | |
15282 | + || au_test_fs_remote(a->h_dst->d_sb)) { | |
15283 | + err = au_whtmp_rmdir(dir, a->btgt, a->h_dst, &a->whlist); | |
15284 | + if (unlikely(err)) | |
15285 | + pr_warning("failed removing whtmp dir %.*s (%d), " | |
15286 | + "ignored.\n", AuDLNPair(a->h_dst), err); | |
15287 | + } else { | |
15288 | + au_nhash_wh_free(&a->thargs->whlist); | |
15289 | + a->thargs->whlist = a->whlist; | |
15290 | + a->whlist.nh_num = 0; | |
15291 | + au_whtmp_kick_rmdir(dir, a->btgt, a->h_dst, a->thargs); | |
15292 | + dput(a->h_dst); | |
15293 | + a->thargs = NULL; | |
15294 | + } | |
15295 | + | |
15296 | + return 0; | |
1308ab2a | 15297 | +} |
1facf9fc | 15298 | + |
4a4d8108 AM |
15299 | +/* make it 'opaque' dir. */ |
15300 | +static int au_ren_diropq(struct au_ren_args *a) | |
15301 | +{ | |
15302 | + int err; | |
15303 | + struct dentry *diropq; | |
1facf9fc | 15304 | + |
4a4d8108 AM |
15305 | + err = 0; |
15306 | + a->src_hinode = au_hi(a->src_inode, a->btgt); | |
15307 | + au_hn_imtx_lock_nested(a->src_hinode, AuLsc_I_CHILD); | |
15308 | + diropq = au_diropq_create(a->src_dentry, a->btgt); | |
15309 | + au_hn_imtx_unlock(a->src_hinode); | |
15310 | + if (IS_ERR(diropq)) | |
15311 | + err = PTR_ERR(diropq); | |
15312 | + dput(diropq); | |
1facf9fc | 15313 | + |
4a4d8108 AM |
15314 | + return err; |
15315 | +} | |
1facf9fc | 15316 | + |
4a4d8108 AM |
15317 | +static int do_rename(struct au_ren_args *a) |
15318 | +{ | |
15319 | + int err; | |
15320 | + struct dentry *d, *h_d; | |
1facf9fc | 15321 | + |
4a4d8108 AM |
15322 | + /* prepare workqueue args for asynchronous rmdir */ |
15323 | + h_d = a->dst_h_dentry; | |
15324 | + if (au_ftest_ren(a->flags, ISDIR) && h_d->d_inode) { | |
15325 | + err = -ENOMEM; | |
15326 | + a->thargs = au_whtmp_rmdir_alloc(a->src_dentry->d_sb, GFP_NOFS); | |
15327 | + if (unlikely(!a->thargs)) | |
15328 | + goto out; | |
15329 | + a->h_dst = dget(h_d); | |
15330 | + } | |
1facf9fc | 15331 | + |
4a4d8108 AM |
15332 | + /* create whiteout for src_dentry */ |
15333 | + if (au_ftest_ren(a->flags, WHSRC)) { | |
15334 | + a->src_wh_dentry | |
15335 | + = au_wh_create(a->src_dentry, a->btgt, a->src_h_parent); | |
15336 | + err = PTR_ERR(a->src_wh_dentry); | |
15337 | + if (IS_ERR(a->src_wh_dentry)) | |
15338 | + goto out_thargs; | |
15339 | + } | |
1facf9fc | 15340 | + |
4a4d8108 AM |
15341 | + /* lookup whiteout for dentry */ |
15342 | + if (au_ftest_ren(a->flags, WHDST)) { | |
15343 | + h_d = au_wh_lkup(a->dst_h_parent, &a->dst_dentry->d_name, | |
15344 | + a->br); | |
15345 | + err = PTR_ERR(h_d); | |
15346 | + if (IS_ERR(h_d)) | |
15347 | + goto out_whsrc; | |
15348 | + if (!h_d->d_inode) | |
15349 | + dput(h_d); | |
15350 | + else | |
15351 | + a->dst_wh_dentry = h_d; | |
15352 | + } | |
1facf9fc | 15353 | + |
4a4d8108 AM |
15354 | + /* rename dentry to tmpwh */ |
15355 | + if (a->thargs) { | |
15356 | + err = au_whtmp_ren(a->dst_h_dentry, a->br); | |
15357 | + if (unlikely(err)) | |
15358 | + goto out_whdst; | |
dece6358 | 15359 | + |
4a4d8108 AM |
15360 | + d = a->dst_dentry; |
15361 | + au_set_h_dptr(d, a->btgt, NULL); | |
15362 | + err = au_lkup_neg(d, a->btgt); | |
15363 | + if (unlikely(err)) | |
15364 | + goto out_whtmp; | |
15365 | + a->dst_h_dentry = au_h_dptr(d, a->btgt); | |
15366 | + } | |
1facf9fc | 15367 | + |
4a4d8108 AM |
15368 | + /* cpup src */ |
15369 | + if (a->dst_h_dentry->d_inode && a->src_bstart != a->btgt) { | |
15370 | + struct mutex *h_mtx = &a->src_h_dentry->d_inode->i_mutex; | |
15371 | + struct file *h_file; | |
1facf9fc | 15372 | + |
4a4d8108 AM |
15373 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); |
15374 | + AuDebugOn(au_dbstart(a->src_dentry) != a->src_bstart); | |
15375 | + h_file = au_h_open_pre(a->src_dentry, a->src_bstart); | |
15376 | + if (IS_ERR(h_file)) { | |
15377 | + err = PTR_ERR(h_file); | |
15378 | + h_file = NULL; | |
15379 | + } else | |
15380 | + err = au_sio_cpup_simple(a->src_dentry, a->btgt, -1, | |
15381 | + !AuCpup_DTIME); | |
15382 | + mutex_unlock(h_mtx); | |
15383 | + au_h_open_post(a->src_dentry, a->src_bstart, h_file); | |
15384 | + if (unlikely(err)) | |
15385 | + goto out_whtmp; | |
15386 | + } | |
1facf9fc | 15387 | + |
4a4d8108 AM |
15388 | + /* rename by vfs_rename or cpup */ |
15389 | + d = a->dst_dentry; | |
15390 | + if (au_ftest_ren(a->flags, ISDIR) | |
15391 | + && (a->dst_wh_dentry | |
15392 | + || au_dbdiropq(d) == a->btgt | |
15393 | + /* hide the lower to keep xino */ | |
15394 | + || a->btgt < au_dbend(d) | |
15395 | + || au_opt_test(au_mntflags(d->d_sb), ALWAYS_DIROPQ))) | |
15396 | + au_fset_ren(a->flags, DIROPQ); | |
15397 | + err = au_ren_or_cpup(a); | |
15398 | + if (unlikely(err)) | |
15399 | + /* leave the copied-up one */ | |
15400 | + goto out_whtmp; | |
1308ab2a | 15401 | + |
4a4d8108 AM |
15402 | + /* make dir opaque */ |
15403 | + if (au_ftest_ren(a->flags, DIROPQ)) { | |
15404 | + err = au_ren_diropq(a); | |
15405 | + if (unlikely(err)) | |
15406 | + goto out_rename; | |
15407 | + } | |
1308ab2a | 15408 | + |
4a4d8108 AM |
15409 | + /* update target timestamps */ |
15410 | + AuDebugOn(au_dbstart(a->src_dentry) != a->btgt); | |
15411 | + a->h_path.dentry = au_h_dptr(a->src_dentry, a->btgt); | |
15412 | + vfsub_update_h_iattr(&a->h_path, /*did*/NULL); /*ignore*/ | |
15413 | + a->src_inode->i_ctime = a->h_path.dentry->d_inode->i_ctime; | |
1facf9fc | 15414 | + |
4a4d8108 AM |
15415 | + /* remove whiteout for dentry */ |
15416 | + if (a->dst_wh_dentry) { | |
15417 | + a->h_path.dentry = a->dst_wh_dentry; | |
15418 | + err = au_wh_unlink_dentry(a->dst_h_dir, &a->h_path, | |
15419 | + a->dst_dentry); | |
15420 | + if (unlikely(err)) | |
15421 | + goto out_diropq; | |
15422 | + } | |
1facf9fc | 15423 | + |
4a4d8108 AM |
15424 | + /* remove whtmp */ |
15425 | + if (a->thargs) | |
15426 | + au_ren_del_whtmp(a); /* ignore this error */ | |
1308ab2a | 15427 | + |
4a4d8108 AM |
15428 | + err = 0; |
15429 | + goto out_success; | |
15430 | + | |
4f0767ce | 15431 | +out_diropq: |
4a4d8108 AM |
15432 | + if (au_ftest_ren(a->flags, DIROPQ)) |
15433 | + au_ren_rev_diropq(err, a); | |
4f0767ce | 15434 | +out_rename: |
4a4d8108 AM |
15435 | + if (!au_ftest_ren(a->flags, CPUP)) |
15436 | + au_ren_rev_rename(err, a); | |
15437 | + else | |
15438 | + au_ren_rev_cpup(err, a); | |
4f0767ce | 15439 | +out_whtmp: |
4a4d8108 AM |
15440 | + if (a->thargs) |
15441 | + au_ren_rev_whtmp(err, a); | |
4f0767ce | 15442 | +out_whdst: |
4a4d8108 AM |
15443 | + dput(a->dst_wh_dentry); |
15444 | + a->dst_wh_dentry = NULL; | |
4f0767ce | 15445 | +out_whsrc: |
4a4d8108 AM |
15446 | + if (a->src_wh_dentry) |
15447 | + au_ren_rev_whsrc(err, a); | |
15448 | + au_ren_rev_drop(a); | |
4f0767ce | 15449 | +out_success: |
4a4d8108 AM |
15450 | + dput(a->src_wh_dentry); |
15451 | + dput(a->dst_wh_dentry); | |
4f0767ce | 15452 | +out_thargs: |
4a4d8108 AM |
15453 | + if (a->thargs) { |
15454 | + dput(a->h_dst); | |
15455 | + au_whtmp_rmdir_free(a->thargs); | |
15456 | + a->thargs = NULL; | |
15457 | + } | |
4f0767ce | 15458 | +out: |
4a4d8108 | 15459 | + return err; |
dece6358 | 15460 | +} |
1facf9fc | 15461 | + |
1308ab2a | 15462 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 15463 | + |
4a4d8108 AM |
15464 | +/* |
15465 | + * test if @dentry dir can be rename destination or not. | |
15466 | + * success means, it is a logically empty dir. | |
15467 | + */ | |
15468 | +static int may_rename_dstdir(struct dentry *dentry, struct au_nhash *whlist) | |
1308ab2a | 15469 | +{ |
4a4d8108 | 15470 | + return au_test_empty(dentry, whlist); |
1308ab2a | 15471 | +} |
1facf9fc | 15472 | + |
4a4d8108 AM |
15473 | +/* |
15474 | + * test if @dentry dir can be rename source or not. | |
15475 | + * if it can, return 0 and @children is filled. | |
15476 | + * success means, | |
15477 | + * - it is a logically empty dir. | |
15478 | + * - or, it exists on writable branch and has no children including whiteouts | |
15479 | + * on the lower branch. | |
15480 | + */ | |
15481 | +static int may_rename_srcdir(struct dentry *dentry, aufs_bindex_t btgt) | |
15482 | +{ | |
15483 | + int err; | |
15484 | + unsigned int rdhash; | |
15485 | + aufs_bindex_t bstart; | |
1facf9fc | 15486 | + |
4a4d8108 AM |
15487 | + bstart = au_dbstart(dentry); |
15488 | + if (bstart != btgt) { | |
15489 | + struct au_nhash whlist; | |
dece6358 | 15490 | + |
4a4d8108 AM |
15491 | + SiMustAnyLock(dentry->d_sb); |
15492 | + rdhash = au_sbi(dentry->d_sb)->si_rdhash; | |
15493 | + if (!rdhash) | |
15494 | + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, | |
15495 | + dentry)); | |
15496 | + err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS); | |
15497 | + if (unlikely(err)) | |
15498 | + goto out; | |
15499 | + err = au_test_empty(dentry, &whlist); | |
15500 | + au_nhash_wh_free(&whlist); | |
15501 | + goto out; | |
15502 | + } | |
dece6358 | 15503 | + |
4a4d8108 AM |
15504 | + if (bstart == au_dbtaildir(dentry)) |
15505 | + return 0; /* success */ | |
dece6358 | 15506 | + |
4a4d8108 | 15507 | + err = au_test_empty_lower(dentry); |
1facf9fc | 15508 | + |
4f0767ce | 15509 | +out: |
4a4d8108 AM |
15510 | + if (err == -ENOTEMPTY) { |
15511 | + AuWarn1("renaming dir who has child(ren) on multiple branches," | |
15512 | + " is not supported\n"); | |
15513 | + err = -EXDEV; | |
15514 | + } | |
15515 | + return err; | |
15516 | +} | |
1308ab2a | 15517 | + |
4a4d8108 AM |
15518 | +/* side effect: sets whlist and h_dentry */ |
15519 | +static int au_ren_may_dir(struct au_ren_args *a) | |
1308ab2a | 15520 | +{ |
4a4d8108 AM |
15521 | + int err; |
15522 | + unsigned int rdhash; | |
15523 | + struct dentry *d; | |
1facf9fc | 15524 | + |
4a4d8108 AM |
15525 | + d = a->dst_dentry; |
15526 | + SiMustAnyLock(d->d_sb); | |
1facf9fc | 15527 | + |
4a4d8108 AM |
15528 | + err = 0; |
15529 | + if (au_ftest_ren(a->flags, ISDIR) && a->dst_inode) { | |
15530 | + rdhash = au_sbi(d->d_sb)->si_rdhash; | |
15531 | + if (!rdhash) | |
15532 | + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, d)); | |
15533 | + err = au_nhash_alloc(&a->whlist, rdhash, GFP_NOFS); | |
15534 | + if (unlikely(err)) | |
15535 | + goto out; | |
1308ab2a | 15536 | + |
4a4d8108 AM |
15537 | + au_set_dbstart(d, a->dst_bstart); |
15538 | + err = may_rename_dstdir(d, &a->whlist); | |
15539 | + au_set_dbstart(d, a->btgt); | |
15540 | + } | |
15541 | + a->dst_h_dentry = au_h_dptr(d, au_dbstart(d)); | |
15542 | + if (unlikely(err)) | |
15543 | + goto out; | |
15544 | + | |
15545 | + d = a->src_dentry; | |
15546 | + a->src_h_dentry = au_h_dptr(d, au_dbstart(d)); | |
15547 | + if (au_ftest_ren(a->flags, ISDIR)) { | |
15548 | + err = may_rename_srcdir(d, a->btgt); | |
15549 | + if (unlikely(err)) { | |
15550 | + au_nhash_wh_free(&a->whlist); | |
15551 | + a->whlist.nh_num = 0; | |
15552 | + } | |
15553 | + } | |
4f0767ce | 15554 | +out: |
4a4d8108 | 15555 | + return err; |
1facf9fc | 15556 | +} |
15557 | + | |
4a4d8108 | 15558 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 15559 | + |
4a4d8108 AM |
15560 | +/* |
15561 | + * simple tests for rename. | |
15562 | + * following the checks in vfs, plus the parent-child relationship. | |
15563 | + */ | |
15564 | +static int au_may_ren(struct au_ren_args *a) | |
15565 | +{ | |
15566 | + int err, isdir; | |
15567 | + struct inode *h_inode; | |
1facf9fc | 15568 | + |
4a4d8108 AM |
15569 | + if (a->src_bstart == a->btgt) { |
15570 | + err = au_may_del(a->src_dentry, a->btgt, a->src_h_parent, | |
15571 | + au_ftest_ren(a->flags, ISDIR)); | |
15572 | + if (unlikely(err)) | |
15573 | + goto out; | |
15574 | + err = -EINVAL; | |
15575 | + if (unlikely(a->src_h_dentry == a->h_trap)) | |
15576 | + goto out; | |
15577 | + } | |
1facf9fc | 15578 | + |
4a4d8108 AM |
15579 | + err = 0; |
15580 | + if (a->dst_bstart != a->btgt) | |
15581 | + goto out; | |
1facf9fc | 15582 | + |
4a4d8108 AM |
15583 | + err = -EIO; |
15584 | + h_inode = a->dst_h_dentry->d_inode; | |
15585 | + isdir = !!au_ftest_ren(a->flags, ISDIR); | |
15586 | + if (!a->dst_dentry->d_inode) { | |
15587 | + if (unlikely(h_inode)) | |
15588 | + goto out; | |
15589 | + err = au_may_add(a->dst_dentry, a->btgt, a->dst_h_parent, | |
15590 | + isdir); | |
15591 | + } else { | |
15592 | + if (unlikely(!h_inode || !h_inode->i_nlink)) | |
15593 | + goto out; | |
15594 | + err = au_may_del(a->dst_dentry, a->btgt, a->dst_h_parent, | |
15595 | + isdir); | |
15596 | + if (unlikely(err)) | |
15597 | + goto out; | |
15598 | + err = -ENOTEMPTY; | |
15599 | + if (unlikely(a->dst_h_dentry == a->h_trap)) | |
15600 | + goto out; | |
15601 | + err = 0; | |
15602 | + } | |
1facf9fc | 15603 | + |
4f0767ce | 15604 | +out: |
4a4d8108 AM |
15605 | + if (unlikely(err == -ENOENT || err == -EEXIST)) |
15606 | + err = -EIO; | |
15607 | + AuTraceErr(err); | |
15608 | + return err; | |
15609 | +} | |
1facf9fc | 15610 | + |
1308ab2a | 15611 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 15612 | + |
4a4d8108 AM |
15613 | +/* |
15614 | + * locking order | |
15615 | + * (VFS) | |
15616 | + * - src_dir and dir by lock_rename() | |
15617 | + * - inode if exitsts | |
15618 | + * (aufs) | |
15619 | + * - lock all | |
15620 | + * + src_dentry and dentry by aufs_read_and_write_lock2() which calls, | |
15621 | + * + si_read_lock | |
15622 | + * + di_write_lock2_child() | |
15623 | + * + di_write_lock_child() | |
15624 | + * + ii_write_lock_child() | |
15625 | + * + di_write_lock_child2() | |
15626 | + * + ii_write_lock_child2() | |
15627 | + * + src_parent and parent | |
15628 | + * + di_write_lock_parent() | |
15629 | + * + ii_write_lock_parent() | |
15630 | + * + di_write_lock_parent2() | |
15631 | + * + ii_write_lock_parent2() | |
15632 | + * + lower src_dir and dir by vfsub_lock_rename() | |
15633 | + * + verify the every relationships between child and parent. if any | |
15634 | + * of them failed, unlock all and return -EBUSY. | |
15635 | + */ | |
15636 | +static void au_ren_unlock(struct au_ren_args *a) | |
1308ab2a | 15637 | +{ |
4a4d8108 AM |
15638 | + struct super_block *sb; |
15639 | + | |
15640 | + sb = a->dst_dentry->d_sb; | |
15641 | + if (au_ftest_ren(a->flags, MNT_WRITE)) | |
15642 | + mnt_drop_write(a->br->br_mnt); | |
15643 | + vfsub_unlock_rename(a->src_h_parent, a->src_hdir, | |
15644 | + a->dst_h_parent, a->dst_hdir); | |
1308ab2a | 15645 | +} |
15646 | + | |
4a4d8108 | 15647 | +static int au_ren_lock(struct au_ren_args *a) |
1308ab2a | 15648 | +{ |
4a4d8108 AM |
15649 | + int err; |
15650 | + unsigned int udba; | |
1308ab2a | 15651 | + |
4a4d8108 AM |
15652 | + err = 0; |
15653 | + a->src_h_parent = au_h_dptr(a->src_parent, a->btgt); | |
15654 | + a->src_hdir = au_hi(a->src_dir, a->btgt); | |
15655 | + a->dst_h_parent = au_h_dptr(a->dst_parent, a->btgt); | |
15656 | + a->dst_hdir = au_hi(a->dst_dir, a->btgt); | |
15657 | + a->h_trap = vfsub_lock_rename(a->src_h_parent, a->src_hdir, | |
15658 | + a->dst_h_parent, a->dst_hdir); | |
15659 | + udba = au_opt_udba(a->src_dentry->d_sb); | |
15660 | + if (unlikely(a->src_hdir->hi_inode != a->src_h_parent->d_inode | |
15661 | + || a->dst_hdir->hi_inode != a->dst_h_parent->d_inode)) | |
15662 | + err = au_busy_or_stale(); | |
15663 | + if (!err && au_dbstart(a->src_dentry) == a->btgt) | |
15664 | + err = au_h_verify(a->src_h_dentry, udba, | |
15665 | + a->src_h_parent->d_inode, a->src_h_parent, | |
15666 | + a->br); | |
15667 | + if (!err && au_dbstart(a->dst_dentry) == a->btgt) | |
15668 | + err = au_h_verify(a->dst_h_dentry, udba, | |
15669 | + a->dst_h_parent->d_inode, a->dst_h_parent, | |
15670 | + a->br); | |
15671 | + if (!err) { | |
15672 | + err = mnt_want_write(a->br->br_mnt); | |
15673 | + if (unlikely(err)) | |
15674 | + goto out_unlock; | |
15675 | + au_fset_ren(a->flags, MNT_WRITE); | |
15676 | + goto out; /* success */ | |
15677 | + } | |
15678 | + | |
15679 | + err = au_busy_or_stale(); | |
15680 | + | |
4f0767ce | 15681 | +out_unlock: |
4a4d8108 | 15682 | + au_ren_unlock(a); |
4f0767ce | 15683 | +out: |
4a4d8108 | 15684 | + return err; |
1facf9fc | 15685 | +} |
15686 | + | |
15687 | +/* ---------------------------------------------------------------------- */ | |
15688 | + | |
4a4d8108 | 15689 | +static void au_ren_refresh_dir(struct au_ren_args *a) |
1facf9fc | 15690 | +{ |
4a4d8108 | 15691 | + struct inode *dir; |
dece6358 | 15692 | + |
4a4d8108 AM |
15693 | + dir = a->dst_dir; |
15694 | + dir->i_version++; | |
15695 | + if (au_ftest_ren(a->flags, ISDIR)) { | |
15696 | + /* is this updating defined in POSIX? */ | |
15697 | + au_cpup_attr_timesizes(a->src_inode); | |
15698 | + au_cpup_attr_nlink(dir, /*force*/1); | |
15699 | + if (a->dst_inode) { | |
15700 | + clear_nlink(a->dst_inode); | |
15701 | + au_cpup_attr_timesizes(a->dst_inode); | |
15702 | + } | |
15703 | + } | |
15704 | + if (au_ibstart(dir) == a->btgt) | |
15705 | + au_cpup_attr_timesizes(dir); | |
dece6358 | 15706 | + |
4a4d8108 AM |
15707 | + if (au_ftest_ren(a->flags, ISSAMEDIR)) |
15708 | + return; | |
dece6358 | 15709 | + |
4a4d8108 AM |
15710 | + dir = a->src_dir; |
15711 | + dir->i_version++; | |
15712 | + if (au_ftest_ren(a->flags, ISDIR)) | |
15713 | + au_cpup_attr_nlink(dir, /*force*/1); | |
15714 | + if (au_ibstart(dir) == a->btgt) | |
15715 | + au_cpup_attr_timesizes(dir); | |
1facf9fc | 15716 | +} |
15717 | + | |
4a4d8108 | 15718 | +static void au_ren_refresh(struct au_ren_args *a) |
1facf9fc | 15719 | +{ |
4a4d8108 AM |
15720 | + aufs_bindex_t bend, bindex; |
15721 | + struct dentry *d, *h_d; | |
15722 | + struct inode *i, *h_i; | |
15723 | + struct super_block *sb; | |
dece6358 | 15724 | + |
4a4d8108 AM |
15725 | + d = a->src_dentry; |
15726 | + au_set_dbwh(d, -1); | |
15727 | + bend = au_dbend(d); | |
15728 | + for (bindex = a->btgt + 1; bindex <= bend; bindex++) { | |
15729 | + h_d = au_h_dptr(d, bindex); | |
15730 | + if (h_d) | |
15731 | + au_set_h_dptr(d, bindex, NULL); | |
15732 | + } | |
15733 | + au_set_dbend(d, a->btgt); | |
15734 | + | |
15735 | + sb = d->d_sb; | |
15736 | + i = a->src_inode; | |
15737 | + if (au_opt_test(au_mntflags(sb), PLINK) && au_plink_test(i)) | |
15738 | + return; /* success */ | |
15739 | + | |
15740 | + bend = au_ibend(i); | |
15741 | + for (bindex = a->btgt + 1; bindex <= bend; bindex++) { | |
15742 | + h_i = au_h_iptr(i, bindex); | |
15743 | + if (h_i) { | |
15744 | + au_xino_write(sb, bindex, h_i->i_ino, /*ino*/0); | |
15745 | + /* ignore this error */ | |
15746 | + au_set_h_iptr(i, bindex, NULL, 0); | |
15747 | + } | |
15748 | + } | |
15749 | + au_set_ibend(i, a->btgt); | |
1308ab2a | 15750 | +} |
dece6358 | 15751 | + |
4a4d8108 AM |
15752 | +/* ---------------------------------------------------------------------- */ |
15753 | + | |
15754 | +/* mainly for link(2) and rename(2) */ | |
15755 | +int au_wbr(struct dentry *dentry, aufs_bindex_t btgt) | |
1308ab2a | 15756 | +{ |
4a4d8108 AM |
15757 | + aufs_bindex_t bdiropq, bwh; |
15758 | + struct dentry *parent; | |
15759 | + struct au_branch *br; | |
15760 | + | |
15761 | + parent = dentry->d_parent; | |
15762 | + IMustLock(parent->d_inode); /* dir is locked */ | |
15763 | + | |
15764 | + bdiropq = au_dbdiropq(parent); | |
15765 | + bwh = au_dbwh(dentry); | |
15766 | + br = au_sbr(dentry->d_sb, btgt); | |
15767 | + if (au_br_rdonly(br) | |
15768 | + || (0 <= bdiropq && bdiropq < btgt) | |
15769 | + || (0 <= bwh && bwh < btgt)) | |
15770 | + btgt = -1; | |
15771 | + | |
15772 | + AuDbg("btgt %d\n", btgt); | |
15773 | + return btgt; | |
1facf9fc | 15774 | +} |
15775 | + | |
4a4d8108 AM |
15776 | +/* sets src_bstart, dst_bstart and btgt */ |
15777 | +static int au_ren_wbr(struct au_ren_args *a) | |
1facf9fc | 15778 | +{ |
4a4d8108 AM |
15779 | + int err; |
15780 | + struct au_wr_dir_args wr_dir_args = { | |
15781 | + /* .force_btgt = -1, */ | |
15782 | + .flags = AuWrDir_ADD_ENTRY | |
15783 | + }; | |
dece6358 | 15784 | + |
4a4d8108 AM |
15785 | + a->src_bstart = au_dbstart(a->src_dentry); |
15786 | + a->dst_bstart = au_dbstart(a->dst_dentry); | |
15787 | + if (au_ftest_ren(a->flags, ISDIR)) | |
15788 | + au_fset_wrdir(wr_dir_args.flags, ISDIR); | |
15789 | + wr_dir_args.force_btgt = a->src_bstart; | |
15790 | + if (a->dst_inode && a->dst_bstart < a->src_bstart) | |
15791 | + wr_dir_args.force_btgt = a->dst_bstart; | |
15792 | + wr_dir_args.force_btgt = au_wbr(a->dst_dentry, wr_dir_args.force_btgt); | |
15793 | + err = au_wr_dir(a->dst_dentry, a->src_dentry, &wr_dir_args); | |
15794 | + a->btgt = err; | |
dece6358 | 15795 | + |
4a4d8108 | 15796 | + return err; |
1facf9fc | 15797 | +} |
15798 | + | |
4a4d8108 | 15799 | +static void au_ren_dt(struct au_ren_args *a) |
1facf9fc | 15800 | +{ |
4a4d8108 AM |
15801 | + a->h_path.dentry = a->src_h_parent; |
15802 | + au_dtime_store(a->src_dt + AuPARENT, a->src_parent, &a->h_path); | |
15803 | + if (!au_ftest_ren(a->flags, ISSAMEDIR)) { | |
15804 | + a->h_path.dentry = a->dst_h_parent; | |
15805 | + au_dtime_store(a->dst_dt + AuPARENT, a->dst_parent, &a->h_path); | |
15806 | + } | |
1facf9fc | 15807 | + |
4a4d8108 AM |
15808 | + au_fclr_ren(a->flags, DT_DSTDIR); |
15809 | + if (!au_ftest_ren(a->flags, ISDIR)) | |
15810 | + return; | |
dece6358 | 15811 | + |
4a4d8108 AM |
15812 | + a->h_path.dentry = a->src_h_dentry; |
15813 | + au_dtime_store(a->src_dt + AuCHILD, a->src_dentry, &a->h_path); | |
15814 | + if (a->dst_h_dentry->d_inode) { | |
15815 | + au_fset_ren(a->flags, DT_DSTDIR); | |
15816 | + a->h_path.dentry = a->dst_h_dentry; | |
15817 | + au_dtime_store(a->dst_dt + AuCHILD, a->dst_dentry, &a->h_path); | |
15818 | + } | |
1308ab2a | 15819 | +} |
dece6358 | 15820 | + |
4a4d8108 | 15821 | +static void au_ren_rev_dt(int err, struct au_ren_args *a) |
1308ab2a | 15822 | +{ |
4a4d8108 AM |
15823 | + struct dentry *h_d; |
15824 | + struct mutex *h_mtx; | |
15825 | + | |
15826 | + au_dtime_revert(a->src_dt + AuPARENT); | |
15827 | + if (!au_ftest_ren(a->flags, ISSAMEDIR)) | |
15828 | + au_dtime_revert(a->dst_dt + AuPARENT); | |
15829 | + | |
15830 | + if (au_ftest_ren(a->flags, ISDIR) && err != -EIO) { | |
15831 | + h_d = a->src_dt[AuCHILD].dt_h_path.dentry; | |
15832 | + h_mtx = &h_d->d_inode->i_mutex; | |
15833 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); | |
15834 | + au_dtime_revert(a->src_dt + AuCHILD); | |
15835 | + mutex_unlock(h_mtx); | |
15836 | + | |
15837 | + if (au_ftest_ren(a->flags, DT_DSTDIR)) { | |
15838 | + h_d = a->dst_dt[AuCHILD].dt_h_path.dentry; | |
15839 | + h_mtx = &h_d->d_inode->i_mutex; | |
15840 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); | |
15841 | + au_dtime_revert(a->dst_dt + AuCHILD); | |
15842 | + mutex_unlock(h_mtx); | |
1facf9fc | 15843 | + } |
15844 | + } | |
15845 | +} | |
15846 | + | |
4a4d8108 AM |
15847 | +/* ---------------------------------------------------------------------- */ |
15848 | + | |
15849 | +int aufs_rename(struct inode *_src_dir, struct dentry *_src_dentry, | |
15850 | + struct inode *_dst_dir, struct dentry *_dst_dentry) | |
1facf9fc | 15851 | +{ |
953406b4 | 15852 | + int err; |
4a4d8108 AM |
15853 | + /* reduce stack space */ |
15854 | + struct au_ren_args *a; | |
15855 | + | |
15856 | + AuDbg("%.*s, %.*s\n", AuDLNPair(_src_dentry), AuDLNPair(_dst_dentry)); | |
15857 | + IMustLock(_src_dir); | |
15858 | + IMustLock(_dst_dir); | |
15859 | + | |
15860 | + err = -ENOMEM; | |
15861 | + BUILD_BUG_ON(sizeof(*a) > PAGE_SIZE); | |
15862 | + a = kzalloc(sizeof(*a), GFP_NOFS); | |
15863 | + if (unlikely(!a)) | |
15864 | + goto out; | |
15865 | + | |
15866 | + a->src_dir = _src_dir; | |
15867 | + a->src_dentry = _src_dentry; | |
15868 | + a->src_inode = a->src_dentry->d_inode; | |
15869 | + a->src_parent = a->src_dentry->d_parent; /* dir inode is locked */ | |
15870 | + a->dst_dir = _dst_dir; | |
15871 | + a->dst_dentry = _dst_dentry; | |
15872 | + a->dst_inode = a->dst_dentry->d_inode; | |
15873 | + a->dst_parent = a->dst_dentry->d_parent; /* dir inode is locked */ | |
15874 | + if (a->dst_inode) { | |
15875 | + IMustLock(a->dst_inode); | |
15876 | + au_igrab(a->dst_inode); | |
1facf9fc | 15877 | + } |
1facf9fc | 15878 | + |
4a4d8108 AM |
15879 | + err = -ENOTDIR; |
15880 | + if (S_ISDIR(a->src_inode->i_mode)) { | |
15881 | + au_fset_ren(a->flags, ISDIR); | |
15882 | + if (unlikely(a->dst_inode && !S_ISDIR(a->dst_inode->i_mode))) | |
15883 | + goto out_free; | |
953406b4 AM |
15884 | + aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry, |
15885 | + AuLock_DIR | AuLock_FLUSH); | |
4a4d8108 | 15886 | + } else |
953406b4 AM |
15887 | + aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry, |
15888 | + AuLock_FLUSH); | |
1facf9fc | 15889 | + |
4a4d8108 AM |
15890 | + au_fset_ren(a->flags, ISSAMEDIR); /* temporary */ |
15891 | + di_write_lock_parent(a->dst_parent); | |
1facf9fc | 15892 | + |
4a4d8108 AM |
15893 | + /* which branch we process */ |
15894 | + err = au_ren_wbr(a); | |
15895 | + if (unlikely(err < 0)) | |
15896 | + goto out_unlock; | |
15897 | + a->br = au_sbr(a->dst_dentry->d_sb, a->btgt); | |
15898 | + a->h_path.mnt = a->br->br_mnt; | |
1facf9fc | 15899 | + |
4a4d8108 AM |
15900 | + /* are they available to be renamed */ |
15901 | + err = au_ren_may_dir(a); | |
15902 | + if (unlikely(err)) | |
15903 | + goto out_children; | |
1facf9fc | 15904 | + |
4a4d8108 AM |
15905 | + /* prepare the writable parent dir on the same branch */ |
15906 | + if (a->dst_bstart == a->btgt) { | |
15907 | + au_fset_ren(a->flags, WHDST); | |
15908 | + } else { | |
15909 | + err = au_cpup_dirs(a->dst_dentry, a->btgt); | |
15910 | + if (unlikely(err)) | |
15911 | + goto out_children; | |
15912 | + } | |
1facf9fc | 15913 | + |
4a4d8108 AM |
15914 | + if (a->src_dir != a->dst_dir) { |
15915 | + /* | |
15916 | + * this temporary unlock is safe, | |
15917 | + * because both dir->i_mutex are locked. | |
15918 | + */ | |
15919 | + di_write_unlock(a->dst_parent); | |
15920 | + di_write_lock_parent(a->src_parent); | |
15921 | + err = au_wr_dir_need_wh(a->src_dentry, | |
15922 | + au_ftest_ren(a->flags, ISDIR), | |
15923 | + &a->btgt); | |
15924 | + di_write_unlock(a->src_parent); | |
15925 | + di_write_lock2_parent(a->src_parent, a->dst_parent, /*isdir*/1); | |
15926 | + au_fclr_ren(a->flags, ISSAMEDIR); | |
15927 | + } else | |
15928 | + err = au_wr_dir_need_wh(a->src_dentry, | |
15929 | + au_ftest_ren(a->flags, ISDIR), | |
15930 | + &a->btgt); | |
15931 | + if (unlikely(err < 0)) | |
15932 | + goto out_children; | |
15933 | + if (err) | |
15934 | + au_fset_ren(a->flags, WHSRC); | |
1facf9fc | 15935 | + |
4a4d8108 AM |
15936 | + /* lock them all */ |
15937 | + err = au_ren_lock(a); | |
15938 | + if (unlikely(err)) | |
15939 | + goto out_children; | |
1facf9fc | 15940 | + |
4a4d8108 AM |
15941 | + if (!au_opt_test(au_mntflags(a->dst_dir->i_sb), UDBA_NONE)) |
15942 | + err = au_may_ren(a); | |
15943 | + else if (unlikely(a->dst_dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
15944 | + err = -ENAMETOOLONG; | |
15945 | + if (unlikely(err)) | |
15946 | + goto out_hdir; | |
1facf9fc | 15947 | + |
4a4d8108 AM |
15948 | + /* store timestamps to be revertible */ |
15949 | + au_ren_dt(a); | |
1facf9fc | 15950 | + |
4a4d8108 AM |
15951 | + /* here we go */ |
15952 | + err = do_rename(a); | |
15953 | + if (unlikely(err)) | |
15954 | + goto out_dt; | |
15955 | + | |
15956 | + /* update dir attributes */ | |
15957 | + au_ren_refresh_dir(a); | |
15958 | + | |
15959 | + /* dput/iput all lower dentries */ | |
15960 | + au_ren_refresh(a); | |
15961 | + | |
15962 | + goto out_hdir; /* success */ | |
15963 | + | |
4f0767ce | 15964 | +out_dt: |
4a4d8108 | 15965 | + au_ren_rev_dt(err, a); |
4f0767ce | 15966 | +out_hdir: |
4a4d8108 | 15967 | + au_ren_unlock(a); |
4f0767ce | 15968 | +out_children: |
4a4d8108 | 15969 | + au_nhash_wh_free(&a->whlist); |
4f0767ce | 15970 | +out_unlock: |
4a4d8108 AM |
15971 | + if (unlikely(err && au_ftest_ren(a->flags, ISDIR))) { |
15972 | + au_update_dbstart(a->dst_dentry); | |
15973 | + d_drop(a->dst_dentry); | |
15974 | + } | |
15975 | + if (!err) | |
15976 | + d_move(a->src_dentry, a->dst_dentry); | |
15977 | + if (au_ftest_ren(a->flags, ISSAMEDIR)) | |
15978 | + di_write_unlock(a->dst_parent); | |
15979 | + else | |
15980 | + di_write_unlock2(a->src_parent, a->dst_parent); | |
15981 | + aufs_read_and_write_unlock2(a->dst_dentry, a->src_dentry); | |
4f0767ce | 15982 | +out_free: |
4a4d8108 AM |
15983 | + iput(a->dst_inode); |
15984 | + if (a->thargs) | |
15985 | + au_whtmp_rmdir_free(a->thargs); | |
15986 | + kfree(a); | |
4f0767ce | 15987 | +out: |
4a4d8108 AM |
15988 | + AuTraceErr(err); |
15989 | + return err; | |
1308ab2a | 15990 | +} |
b752ccd1 AM |
15991 | diff -urN /usr/share/empty/fs/aufs/Kconfig linux/fs/aufs/Kconfig |
15992 | --- /usr/share/empty/fs/aufs/Kconfig 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
15993 | +++ linux/fs/aufs/Kconfig 2010-10-21 09:52:43.083624114 +0200 |
15994 | @@ -0,0 +1,173 @@ | |
4a4d8108 AM |
15995 | +config AUFS_FS |
15996 | + tristate "Aufs (Advanced multi layered unification filesystem) support" | |
15997 | + depends on EXPERIMENTAL | |
15998 | + help | |
15999 | + Aufs is a stackable unification filesystem such as Unionfs, | |
16000 | + which unifies several directories and provides a merged single | |
16001 | + directory. | |
16002 | + In the early days, aufs was entirely re-designed and | |
16003 | + re-implemented Unionfs Version 1.x series. Introducing many | |
16004 | + original ideas, approaches and improvements, it becomes totally | |
16005 | + different from Unionfs while keeping the basic features. | |
1facf9fc | 16006 | + |
4a4d8108 AM |
16007 | +if AUFS_FS |
16008 | +choice | |
16009 | + prompt "Maximum number of branches" | |
16010 | + default AUFS_BRANCH_MAX_127 | |
16011 | + help | |
16012 | + Specifies the maximum number of branches (or member directories) | |
16013 | + in a single aufs. The larger value consumes more system | |
16014 | + resources and has a minor impact to performance. | |
16015 | +config AUFS_BRANCH_MAX_127 | |
16016 | + bool "127" | |
16017 | + help | |
16018 | + Specifies the maximum number of branches (or member directories) | |
16019 | + in a single aufs. The larger value consumes more system | |
16020 | + resources and has a minor impact to performance. | |
16021 | +config AUFS_BRANCH_MAX_511 | |
16022 | + bool "511" | |
16023 | + help | |
16024 | + Specifies the maximum number of branches (or member directories) | |
16025 | + in a single aufs. The larger value consumes more system | |
16026 | + resources and has a minor impact to performance. | |
16027 | +config AUFS_BRANCH_MAX_1023 | |
16028 | + bool "1023" | |
16029 | + help | |
16030 | + Specifies the maximum number of branches (or member directories) | |
16031 | + in a single aufs. The larger value consumes more system | |
16032 | + resources and has a minor impact to performance. | |
16033 | +config AUFS_BRANCH_MAX_32767 | |
16034 | + bool "32767" | |
16035 | + help | |
16036 | + Specifies the maximum number of branches (or member directories) | |
16037 | + in a single aufs. The larger value consumes more system | |
16038 | + resources and has a minor impact to performance. | |
16039 | +endchoice | |
1facf9fc | 16040 | + |
4a4d8108 AM |
16041 | +config AUFS_HNOTIFY |
16042 | + bool "Detect direct branch access (bypassing aufs)" | |
16043 | + help | |
16044 | + If you want to modify files on branches directly, eg. bypassing aufs, | |
16045 | + and want aufs to detect the changes of them fully, then enable this | |
16046 | + option and use 'udba=notify' mount option. | |
953406b4 | 16047 | + Currently there is only one available configuration, "fsnotify". |
4a4d8108 AM |
16048 | + It will have a negative impact to the performance. |
16049 | + See detail in aufs.5. | |
dece6358 | 16050 | + |
953406b4 | 16051 | + |
4a4d8108 AM |
16052 | +choice |
16053 | + prompt "method" if AUFS_HNOTIFY | |
16054 | + default AUFS_HFSNOTIFY | |
16055 | +config AUFS_HFSNOTIFY | |
16056 | + bool "fsnotify" | |
16057 | + select FSNOTIFY | |
4a4d8108 | 16058 | +endchoice |
1facf9fc | 16059 | + |
4a4d8108 AM |
16060 | +config AUFS_EXPORT |
16061 | + bool "NFS-exportable aufs" | |
16062 | + depends on (AUFS_FS = y && EXPORTFS = y) || (AUFS_FS = m && EXPORTFS) | |
16063 | + help | |
16064 | + If you want to export your mounted aufs via NFS, then enable this | |
16065 | + option. There are several requirements for this configuration. | |
16066 | + See detail in aufs.5. | |
1facf9fc | 16067 | + |
4a4d8108 AM |
16068 | +config AUFS_INO_T_64 |
16069 | + bool | |
16070 | + depends on AUFS_EXPORT | |
16071 | + depends on 64BIT && !(ALPHA || S390) | |
16072 | + default y | |
16073 | + help | |
16074 | + Automatic configuration for internal use. | |
16075 | + /* typedef unsigned long/int __kernel_ino_t */ | |
16076 | + /* alpha and s390x are int */ | |
1facf9fc | 16077 | + |
4a4d8108 AM |
16078 | +config AUFS_RDU |
16079 | + bool "Readdir in userspace" | |
16080 | + help | |
16081 | + Aufs has two methods to provide a merged view for a directory, | |
16082 | + by a user-space library and by kernel-space natively. The latter | |
16083 | + is always enabled but sometimes large and slow. | |
16084 | + If you enable this option, install the library in aufs2-util | |
16085 | + package, and set some environment variables for your readdir(3), | |
16086 | + then the work will be handled in user-space which generally | |
16087 | + shows better performance in most cases. | |
16088 | + See detail in aufs.5. | |
1facf9fc | 16089 | + |
4a4d8108 AM |
16090 | +config AUFS_SP_IATTR |
16091 | + bool "Respect the attributes (mtime/ctime mainly) of special files" | |
16092 | + help | |
16093 | + When you write something to a special file, some attributes of it | |
16094 | + (mtime/ctime mainly) may be updated. Generally such updates are | |
16095 | + less important (actually some device drivers and NFS ignore | |
16096 | + it). But some applications (such like test program) requires | |
16097 | + such updates. If you need these updates, then enable this | |
16098 | + configuration which introduces some overhead. | |
16099 | + Currently this configuration handles FIFO only. | |
1facf9fc | 16100 | + |
4a4d8108 AM |
16101 | +config AUFS_SHWH |
16102 | + bool "Show whiteouts" | |
16103 | + help | |
16104 | + If you want to make the whiteouts in aufs visible, then enable | |
16105 | + this option and specify 'shwh' mount option. Although it may | |
16106 | + sounds like philosophy or something, but in technically it | |
16107 | + simply shows the name of whiteout with keeping its behaviour. | |
1facf9fc | 16108 | + |
4a4d8108 AM |
16109 | +config AUFS_BR_RAMFS |
16110 | + bool "Ramfs (initramfs/rootfs) as an aufs branch" | |
16111 | + help | |
16112 | + If you want to use ramfs as an aufs branch fs, then enable this | |
16113 | + option. Generally tmpfs is recommended. | |
16114 | + Aufs prohibited them to be a branch fs by default, because | |
16115 | + initramfs becomes unusable after switch_root or something | |
16116 | + generally. If you sets initramfs as an aufs branch and boot your | |
16117 | + system by switch_root, you will meet a problem easily since the | |
16118 | + files in initramfs may be inaccessible. | |
16119 | + Unless you are going to use ramfs as an aufs branch fs without | |
16120 | + switch_root or something, leave it N. | |
1facf9fc | 16121 | + |
4a4d8108 AM |
16122 | +config AUFS_BR_FUSE |
16123 | + bool "Fuse fs as an aufs branch" | |
16124 | + depends on FUSE_FS | |
16125 | + select AUFS_POLL | |
16126 | + help | |
16127 | + If you want to use fuse-based userspace filesystem as an aufs | |
16128 | + branch fs, then enable this option. | |
16129 | + It implements the internal poll(2) operation which is | |
16130 | + implemented by fuse only (curretnly). | |
1facf9fc | 16131 | + |
4a4d8108 AM |
16132 | +config AUFS_POLL |
16133 | + bool | |
16134 | + help | |
16135 | + Automatic configuration for internal use. | |
1facf9fc | 16136 | + |
4a4d8108 AM |
16137 | +config AUFS_BR_HFSPLUS |
16138 | + bool "Hfsplus as an aufs branch" | |
16139 | + depends on HFSPLUS_FS | |
16140 | + default y | |
16141 | + help | |
16142 | + If you want to use hfsplus fs as an aufs branch fs, then enable | |
16143 | + this option. This option introduces a small overhead at | |
16144 | + copying-up a file on hfsplus. | |
1facf9fc | 16145 | + |
4a4d8108 AM |
16146 | +config AUFS_BDEV_LOOP |
16147 | + bool | |
16148 | + depends on BLK_DEV_LOOP | |
16149 | + default y | |
16150 | + help | |
16151 | + Automatic configuration for internal use. | |
16152 | + Convert =[ym] into =y. | |
1308ab2a | 16153 | + |
4a4d8108 AM |
16154 | +config AUFS_DEBUG |
16155 | + bool "Debug aufs" | |
16156 | + help | |
16157 | + Enable this to compile aufs internal debug code. | |
16158 | + It will have a negative impact to the performance. | |
16159 | + | |
16160 | +config AUFS_MAGIC_SYSRQ | |
16161 | + bool | |
16162 | + depends on AUFS_DEBUG && MAGIC_SYSRQ | |
16163 | + default y | |
16164 | + help | |
16165 | + Automatic configuration for internal use. | |
16166 | + When aufs supports Magic SysRq, enabled automatically. | |
16167 | +endif | |
b752ccd1 AM |
16168 | diff -urN /usr/share/empty/fs/aufs/loop.c linux/fs/aufs/loop.c |
16169 | --- /usr/share/empty/fs/aufs/loop.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 16170 | +++ linux/fs/aufs/loop.c 2010-10-21 09:52:43.093625591 +0200 |
b752ccd1 | 16171 | @@ -0,0 +1,63 @@ |
1facf9fc | 16172 | +/* |
4a4d8108 | 16173 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 16174 | + * |
16175 | + * This program, aufs is free software; you can redistribute it and/or modify | |
16176 | + * it under the terms of the GNU General Public License as published by | |
16177 | + * the Free Software Foundation; either version 2 of the License, or | |
16178 | + * (at your option) any later version. | |
dece6358 AM |
16179 | + * |
16180 | + * This program is distributed in the hope that it will be useful, | |
16181 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16182 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16183 | + * GNU General Public License for more details. | |
16184 | + * | |
16185 | + * You should have received a copy of the GNU General Public License | |
16186 | + * along with this program; if not, write to the Free Software | |
16187 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 16188 | + */ |
16189 | + | |
16190 | +/* | |
16191 | + * support for loopback block device as a branch | |
16192 | + */ | |
16193 | + | |
16194 | +#include <linux/loop.h> | |
16195 | +#include "aufs.h" | |
16196 | + | |
16197 | +/* | |
16198 | + * test if two lower dentries have overlapping branches. | |
16199 | + */ | |
b752ccd1 | 16200 | +int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding) |
1facf9fc | 16201 | +{ |
b752ccd1 | 16202 | + struct super_block *h_sb; |
1facf9fc | 16203 | + struct loop_device *l; |
16204 | + | |
b752ccd1 AM |
16205 | + h_sb = h_adding->d_sb; |
16206 | + if (MAJOR(h_sb->s_dev) != LOOP_MAJOR) | |
1facf9fc | 16207 | + return 0; |
16208 | + | |
b752ccd1 AM |
16209 | + l = h_sb->s_bdev->bd_disk->private_data; |
16210 | + h_adding = l->lo_backing_file->f_dentry; | |
16211 | + /* | |
16212 | + * h_adding can be local NFS. | |
16213 | + * in this case aufs cannot detect the loop. | |
16214 | + */ | |
16215 | + if (unlikely(h_adding->d_sb == sb)) | |
1facf9fc | 16216 | + return 1; |
b752ccd1 | 16217 | + return !!au_test_subdir(h_adding, sb->s_root); |
1facf9fc | 16218 | +} |
16219 | + | |
16220 | +/* true if a kernel thread named 'loop[0-9].*' accesses a file */ | |
16221 | +int au_test_loopback_kthread(void) | |
16222 | +{ | |
b752ccd1 AM |
16223 | + int ret; |
16224 | + struct task_struct *tsk = current; | |
16225 | + | |
16226 | + ret = 0; | |
16227 | + if (tsk->flags & PF_KTHREAD) { | |
16228 | + const char c = tsk->comm[4]; | |
16229 | + ret = ('0' <= c && c <= '9' | |
16230 | + && !strncmp(tsk->comm, "loop", 4)); | |
16231 | + } | |
1facf9fc | 16232 | + |
b752ccd1 | 16233 | + return ret; |
1facf9fc | 16234 | +} |
b752ccd1 AM |
16235 | diff -urN /usr/share/empty/fs/aufs/loop.h linux/fs/aufs/loop.h |
16236 | --- /usr/share/empty/fs/aufs/loop.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 16237 | +++ linux/fs/aufs/loop.h 2010-10-21 09:52:43.093625591 +0200 |
b752ccd1 | 16238 | @@ -0,0 +1,42 @@ |
1facf9fc | 16239 | +/* |
4a4d8108 | 16240 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 16241 | + * |
16242 | + * This program, aufs is free software; you can redistribute it and/or modify | |
16243 | + * it under the terms of the GNU General Public License as published by | |
16244 | + * the Free Software Foundation; either version 2 of the License, or | |
16245 | + * (at your option) any later version. | |
dece6358 AM |
16246 | + * |
16247 | + * This program is distributed in the hope that it will be useful, | |
16248 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16249 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16250 | + * GNU General Public License for more details. | |
16251 | + * | |
16252 | + * You should have received a copy of the GNU General Public License | |
16253 | + * along with this program; if not, write to the Free Software | |
16254 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 16255 | + */ |
16256 | + | |
16257 | +/* | |
16258 | + * support for loopback mount as a branch | |
16259 | + */ | |
16260 | + | |
16261 | +#ifndef __AUFS_LOOP_H__ | |
16262 | +#define __AUFS_LOOP_H__ | |
16263 | + | |
16264 | +#ifdef __KERNEL__ | |
16265 | + | |
dece6358 AM |
16266 | +struct dentry; |
16267 | +struct super_block; | |
1facf9fc | 16268 | + |
16269 | +#ifdef CONFIG_AUFS_BDEV_LOOP | |
16270 | +/* loop.c */ | |
b752ccd1 | 16271 | +int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding); |
1facf9fc | 16272 | +int au_test_loopback_kthread(void); |
16273 | +#else | |
4a4d8108 | 16274 | +AuStubInt0(au_test_loopback_overlap, struct super_block *sb, |
b752ccd1 | 16275 | + struct dentry *h_adding) |
4a4d8108 | 16276 | +AuStubInt0(au_test_loopback_kthread, void) |
1facf9fc | 16277 | +#endif /* BLK_DEV_LOOP */ |
16278 | + | |
16279 | +#endif /* __KERNEL__ */ | |
16280 | +#endif /* __AUFS_LOOP_H__ */ | |
b752ccd1 AM |
16281 | diff -urN /usr/share/empty/fs/aufs/magic.mk linux/fs/aufs/magic.mk |
16282 | --- /usr/share/empty/fs/aufs/magic.mk 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 16283 | +++ linux/fs/aufs/magic.mk 2010-10-21 09:52:43.093625591 +0200 |
4a4d8108 | 16284 | @@ -0,0 +1,54 @@ |
1facf9fc | 16285 | + |
16286 | +# defined in ${srctree}/fs/fuse/inode.c | |
16287 | +# tristate | |
16288 | +ifdef CONFIG_FUSE_FS | |
16289 | +ccflags-y += -DFUSE_SUPER_MAGIC=0x65735546 | |
16290 | +endif | |
16291 | + | |
16292 | +# defined in ${srctree}/fs/ocfs2/ocfs2_fs.h | |
16293 | +# tristate | |
16294 | +ifdef CONFIG_OCFS2_FS | |
16295 | +ccflags-y += -DOCFS2_SUPER_MAGIC=0x7461636f | |
16296 | +endif | |
16297 | + | |
16298 | +# defined in ${srctree}/fs/ocfs2/dlm/userdlm.h | |
16299 | +# tristate | |
16300 | +ifdef CONFIG_OCFS2_FS_O2CB | |
16301 | +ccflags-y += -DDLMFS_MAGIC=0x76a9f425 | |
16302 | +endif | |
16303 | + | |
1facf9fc | 16304 | +# defined in ${srctree}/fs/cifs/cifsfs.c |
16305 | +# tristate | |
16306 | +ifdef CONFIG_CIFS_FS | |
16307 | +ccflags-y += -DCIFS_MAGIC_NUMBER=0xFF534D42 | |
16308 | +endif | |
16309 | + | |
16310 | +# defined in ${srctree}/fs/xfs/xfs_sb.h | |
16311 | +# tristate | |
16312 | +ifdef CONFIG_XFS_FS | |
16313 | +ccflags-y += -DXFS_SB_MAGIC=0x58465342 | |
16314 | +endif | |
16315 | + | |
16316 | +# defined in ${srctree}/fs/configfs/mount.c | |
16317 | +# tristate | |
16318 | +ifdef CONFIG_CONFIGFS_FS | |
16319 | +ccflags-y += -DCONFIGFS_MAGIC=0x62656570 | |
16320 | +endif | |
16321 | + | |
16322 | +# defined in ${srctree}/fs/9p/v9fs.h | |
16323 | +# tristate | |
16324 | +ifdef CONFIG_9P_FS | |
16325 | +ccflags-y += -DV9FS_MAGIC=0x01021997 | |
16326 | +endif | |
16327 | + | |
16328 | +# defined in ${srctree}/fs/ubifs/ubifs.h | |
16329 | +# tristate | |
16330 | +ifdef CONFIG_UBIFS_FS | |
16331 | +ccflags-y += -DUBIFS_SUPER_MAGIC=0x24051905 | |
16332 | +endif | |
4a4d8108 AM |
16333 | + |
16334 | +# defined in ${srctree}/fs/hfsplus/hfsplus_raw.h | |
16335 | +# tristate | |
16336 | +ifdef CONFIG_HFSPLUS_FS | |
16337 | +ccflags-y += -DHFSPLUS_SUPER_MAGIC=0x482b | |
16338 | +endif | |
b752ccd1 AM |
16339 | diff -urN /usr/share/empty/fs/aufs/Makefile linux/fs/aufs/Makefile |
16340 | --- /usr/share/empty/fs/aufs/Makefile 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
16341 | +++ linux/fs/aufs/Makefile 2010-10-21 09:52:43.083624114 +0200 |
16342 | @@ -0,0 +1,37 @@ | |
4a4d8108 AM |
16343 | + |
16344 | +include ${src}/magic.mk | |
16345 | +ifeq (${CONFIG_AUFS_FS},m) | |
16346 | +include ${src}/conf.mk | |
16347 | +endif | |
16348 | +-include ${src}/priv_def.mk | |
16349 | + | |
16350 | +# cf. include/linux/kernel.h | |
16351 | +# enable pr_debug | |
16352 | +ccflags-y += -DDEBUG | |
16353 | +ccflags-y += -D'pr_fmt(fmt)="aufs %s:%d:%s[%d]: " fmt, \ | |
16354 | + __func__, __LINE__, current->comm, current->pid' | |
16355 | + | |
16356 | +obj-$(CONFIG_AUFS_FS) += aufs.o | |
16357 | +aufs-y := module.o sbinfo.o super.o branch.o xino.o sysaufs.o opts.o \ | |
16358 | + wkq.o vfsub.o dcsub.o \ | |
953406b4 | 16359 | + cpup.o whout.o plink.o wbr_policy.o \ |
4a4d8108 AM |
16360 | + dinfo.o dentry.o \ |
16361 | + dynop.o \ | |
16362 | + finfo.o file.o f_op.o \ | |
16363 | + dir.o vdir.o \ | |
16364 | + iinfo.o inode.o i_op.o i_op_add.o i_op_del.o i_op_ren.o \ | |
16365 | + ioctl.o | |
16366 | + | |
16367 | +# all are boolean | |
16368 | +aufs-$(CONFIG_SYSFS) += sysfs.o | |
16369 | +aufs-$(CONFIG_DEBUG_FS) += dbgaufs.o | |
16370 | +aufs-$(CONFIG_AUFS_BDEV_LOOP) += loop.o | |
16371 | +aufs-$(CONFIG_AUFS_HNOTIFY) += hnotify.o | |
16372 | +aufs-$(CONFIG_AUFS_HFSNOTIFY) += hfsnotify.o | |
4a4d8108 AM |
16373 | +aufs-$(CONFIG_AUFS_EXPORT) += export.o |
16374 | +aufs-$(CONFIG_AUFS_POLL) += poll.o | |
16375 | +aufs-$(CONFIG_AUFS_RDU) += rdu.o | |
16376 | +aufs-$(CONFIG_AUFS_SP_IATTR) += f_op_sp.o | |
16377 | +aufs-$(CONFIG_AUFS_BR_HFSPLUS) += hfsplus.o | |
16378 | +aufs-$(CONFIG_AUFS_DEBUG) += debug.o | |
16379 | +aufs-$(CONFIG_AUFS_MAGIC_SYSRQ) += sysrq.o | |
b752ccd1 AM |
16380 | diff -urN /usr/share/empty/fs/aufs/module.c linux/fs/aufs/module.c |
16381 | --- /usr/share/empty/fs/aufs/module.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
16382 | +++ linux/fs/aufs/module.c 2010-10-21 09:52:43.093625591 +0200 |
16383 | @@ -0,0 +1,171 @@ | |
1facf9fc | 16384 | +/* |
4a4d8108 | 16385 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 16386 | + * |
16387 | + * This program, aufs is free software; you can redistribute it and/or modify | |
16388 | + * it under the terms of the GNU General Public License as published by | |
16389 | + * the Free Software Foundation; either version 2 of the License, or | |
16390 | + * (at your option) any later version. | |
dece6358 AM |
16391 | + * |
16392 | + * This program is distributed in the hope that it will be useful, | |
16393 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16394 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16395 | + * GNU General Public License for more details. | |
16396 | + * | |
16397 | + * You should have received a copy of the GNU General Public License | |
16398 | + * along with this program; if not, write to the Free Software | |
16399 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 16400 | + */ |
16401 | + | |
16402 | +/* | |
16403 | + * module global variables and operations | |
16404 | + */ | |
16405 | + | |
16406 | +#include <linux/module.h> | |
16407 | +#include <linux/seq_file.h> | |
16408 | +#include "aufs.h" | |
16409 | + | |
16410 | +void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp) | |
16411 | +{ | |
16412 | + if (new_sz <= nused) | |
16413 | + return p; | |
16414 | + | |
16415 | + p = krealloc(p, new_sz, gfp); | |
16416 | + if (p) | |
16417 | + memset(p + nused, 0, new_sz - nused); | |
16418 | + return p; | |
16419 | +} | |
16420 | + | |
16421 | +/* ---------------------------------------------------------------------- */ | |
16422 | + | |
16423 | +/* | |
16424 | + * aufs caches | |
16425 | + */ | |
16426 | +struct kmem_cache *au_cachep[AuCache_Last]; | |
16427 | +static int __init au_cache_init(void) | |
16428 | +{ | |
4a4d8108 | 16429 | + au_cachep[AuCache_DINFO] = AuCacheCtor(au_dinfo, au_di_init_once); |
1facf9fc | 16430 | + if (au_cachep[AuCache_DINFO]) |
4a4d8108 AM |
16431 | + au_cachep[AuCache_ICNTNR] = AuCacheCtor(au_icntnr, |
16432 | + au_icntnr_init_once); | |
1facf9fc | 16433 | + if (au_cachep[AuCache_ICNTNR]) |
4a4d8108 AM |
16434 | + au_cachep[AuCache_FINFO] = AuCacheCtor(au_finfo, |
16435 | + au_fi_init_once); | |
1facf9fc | 16436 | + if (au_cachep[AuCache_FINFO]) |
16437 | + au_cachep[AuCache_VDIR] = AuCache(au_vdir); | |
16438 | + if (au_cachep[AuCache_VDIR]) | |
16439 | + au_cachep[AuCache_DEHSTR] = AuCache(au_vdir_dehstr); | |
16440 | + if (au_cachep[AuCache_DEHSTR]) | |
16441 | + return 0; | |
16442 | + | |
16443 | + return -ENOMEM; | |
16444 | +} | |
16445 | + | |
16446 | +static void au_cache_fin(void) | |
16447 | +{ | |
16448 | + int i; | |
4a4d8108 AM |
16449 | + |
16450 | + /* including AuCache_HNOTIFY */ | |
1facf9fc | 16451 | + for (i = 0; i < AuCache_Last; i++) |
16452 | + if (au_cachep[i]) { | |
16453 | + kmem_cache_destroy(au_cachep[i]); | |
16454 | + au_cachep[i] = NULL; | |
16455 | + } | |
16456 | +} | |
16457 | + | |
16458 | +/* ---------------------------------------------------------------------- */ | |
16459 | + | |
16460 | +int au_dir_roflags; | |
16461 | + | |
16462 | +/* | |
16463 | + * functions for module interface. | |
16464 | + */ | |
16465 | +MODULE_LICENSE("GPL"); | |
16466 | +/* MODULE_LICENSE("GPL v2"); */ | |
dece6358 | 16467 | +MODULE_AUTHOR("Junjiro R. Okajima <aufs-users@lists.sourceforge.net>"); |
1facf9fc | 16468 | +MODULE_DESCRIPTION(AUFS_NAME |
16469 | + " -- Advanced multi layered unification filesystem"); | |
16470 | +MODULE_VERSION(AUFS_VERSION); | |
16471 | + | |
1facf9fc | 16472 | +/* this module parameter has no meaning when SYSFS is disabled */ |
16473 | +int sysaufs_brs = 1; | |
16474 | +MODULE_PARM_DESC(brs, "use <sysfs>/fs/aufs/si_*/brN"); | |
16475 | +module_param_named(brs, sysaufs_brs, int, S_IRUGO); | |
16476 | + | |
16477 | +/* ---------------------------------------------------------------------- */ | |
16478 | + | |
16479 | +static char au_esc_chars[0x20 + 3]; /* 0x01-0x20, backslash, del, and NULL */ | |
16480 | + | |
16481 | +int au_seq_path(struct seq_file *seq, struct path *path) | |
16482 | +{ | |
16483 | + return seq_path(seq, path, au_esc_chars); | |
16484 | +} | |
16485 | + | |
16486 | +/* ---------------------------------------------------------------------- */ | |
16487 | + | |
16488 | +static int __init aufs_init(void) | |
16489 | +{ | |
16490 | + int err, i; | |
16491 | + char *p; | |
16492 | + | |
16493 | + p = au_esc_chars; | |
16494 | + for (i = 1; i <= ' '; i++) | |
16495 | + *p++ = i; | |
16496 | + *p++ = '\\'; | |
16497 | + *p++ = '\x7f'; | |
16498 | + *p = 0; | |
16499 | + | |
16500 | + au_dir_roflags = au_file_roflags(O_DIRECTORY | O_LARGEFILE); | |
16501 | + | |
16502 | + sysaufs_brs_init(); | |
16503 | + au_debug_init(); | |
4a4d8108 | 16504 | + au_dy_init(); |
1facf9fc | 16505 | + err = sysaufs_init(); |
16506 | + if (unlikely(err)) | |
16507 | + goto out; | |
4f0767ce JR |
16508 | + err = au_wkq_init(); |
16509 | + if (unlikely(err)) | |
953406b4 | 16510 | + goto out_sysaufs; |
4a4d8108 | 16511 | + err = au_hnotify_init(); |
1facf9fc | 16512 | + if (unlikely(err)) |
16513 | + goto out_wkq; | |
16514 | + err = au_sysrq_init(); | |
16515 | + if (unlikely(err)) | |
16516 | + goto out_hin; | |
16517 | + err = au_cache_init(); | |
16518 | + if (unlikely(err)) | |
16519 | + goto out_sysrq; | |
16520 | + err = register_filesystem(&aufs_fs_type); | |
16521 | + if (unlikely(err)) | |
16522 | + goto out_cache; | |
4a4d8108 AM |
16523 | + /* since we define pr_fmt, call printk directly */ |
16524 | + printk(KERN_INFO AUFS_NAME " " AUFS_VERSION "\n"); | |
1facf9fc | 16525 | + goto out; /* success */ |
16526 | + | |
4f0767ce | 16527 | +out_cache: |
1facf9fc | 16528 | + au_cache_fin(); |
4f0767ce | 16529 | +out_sysrq: |
1facf9fc | 16530 | + au_sysrq_fin(); |
4f0767ce | 16531 | +out_hin: |
4a4d8108 | 16532 | + au_hnotify_fin(); |
4f0767ce | 16533 | +out_wkq: |
1facf9fc | 16534 | + au_wkq_fin(); |
4f0767ce | 16535 | +out_sysaufs: |
1facf9fc | 16536 | + sysaufs_fin(); |
4a4d8108 | 16537 | + au_dy_fin(); |
4f0767ce | 16538 | +out: |
1facf9fc | 16539 | + return err; |
16540 | +} | |
16541 | + | |
16542 | +static void __exit aufs_exit(void) | |
16543 | +{ | |
16544 | + unregister_filesystem(&aufs_fs_type); | |
16545 | + au_cache_fin(); | |
16546 | + au_sysrq_fin(); | |
4a4d8108 | 16547 | + au_hnotify_fin(); |
1facf9fc | 16548 | + au_wkq_fin(); |
16549 | + sysaufs_fin(); | |
4a4d8108 | 16550 | + au_dy_fin(); |
1facf9fc | 16551 | +} |
16552 | + | |
16553 | +module_init(aufs_init); | |
16554 | +module_exit(aufs_exit); | |
b752ccd1 AM |
16555 | diff -urN /usr/share/empty/fs/aufs/module.h linux/fs/aufs/module.h |
16556 | --- /usr/share/empty/fs/aufs/module.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
16557 | +++ linux/fs/aufs/module.h 2010-10-21 09:52:43.093625591 +0200 |
16558 | @@ -0,0 +1,82 @@ | |
1facf9fc | 16559 | +/* |
4a4d8108 | 16560 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 16561 | + * |
16562 | + * This program, aufs is free software; you can redistribute it and/or modify | |
16563 | + * it under the terms of the GNU General Public License as published by | |
16564 | + * the Free Software Foundation; either version 2 of the License, or | |
16565 | + * (at your option) any later version. | |
dece6358 AM |
16566 | + * |
16567 | + * This program is distributed in the hope that it will be useful, | |
16568 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16569 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16570 | + * GNU General Public License for more details. | |
16571 | + * | |
16572 | + * You should have received a copy of the GNU General Public License | |
16573 | + * along with this program; if not, write to the Free Software | |
16574 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 16575 | + */ |
16576 | + | |
16577 | +/* | |
16578 | + * module initialization and module-global | |
16579 | + */ | |
16580 | + | |
16581 | +#ifndef __AUFS_MODULE_H__ | |
16582 | +#define __AUFS_MODULE_H__ | |
16583 | + | |
16584 | +#ifdef __KERNEL__ | |
16585 | + | |
16586 | +#include <linux/slab.h> | |
16587 | + | |
dece6358 AM |
16588 | +struct path; |
16589 | +struct seq_file; | |
16590 | + | |
1facf9fc | 16591 | +/* module parameters */ |
1facf9fc | 16592 | +extern int sysaufs_brs; |
16593 | + | |
16594 | +/* ---------------------------------------------------------------------- */ | |
16595 | + | |
16596 | +extern int au_dir_roflags; | |
16597 | + | |
16598 | +void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp); | |
16599 | +int au_seq_path(struct seq_file *seq, struct path *path); | |
16600 | + | |
4f0767ce JR |
16601 | +/* ---------------------------------------------------------------------- */ |
16602 | + | |
16603 | +/* kmem cache */ | |
1facf9fc | 16604 | +enum { |
16605 | + AuCache_DINFO, | |
16606 | + AuCache_ICNTNR, | |
16607 | + AuCache_FINFO, | |
16608 | + AuCache_VDIR, | |
16609 | + AuCache_DEHSTR, | |
4a4d8108 AM |
16610 | +#ifdef CONFIG_AUFS_HNOTIFY |
16611 | + AuCache_HNOTIFY, | |
1facf9fc | 16612 | +#endif |
16613 | + AuCache_Last | |
16614 | +}; | |
16615 | + | |
4a4d8108 AM |
16616 | +#define AuCacheFlags (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD) |
16617 | +#define AuCache(type) KMEM_CACHE(type, AuCacheFlags) | |
16618 | +#define AuCacheCtor(type, ctor) \ | |
16619 | + kmem_cache_create(#type, sizeof(struct type), \ | |
16620 | + __alignof__(struct type), AuCacheFlags, ctor) | |
1facf9fc | 16621 | + |
16622 | +extern struct kmem_cache *au_cachep[]; | |
16623 | + | |
16624 | +#define AuCacheFuncs(name, index) \ | |
4a4d8108 | 16625 | +static inline struct au_##name *au_cache_alloc_##name(void) \ |
1facf9fc | 16626 | +{ return kmem_cache_alloc(au_cachep[AuCache_##index], GFP_NOFS); } \ |
4a4d8108 | 16627 | +static inline void au_cache_free_##name(struct au_##name *p) \ |
1facf9fc | 16628 | +{ kmem_cache_free(au_cachep[AuCache_##index], p); } |
16629 | + | |
16630 | +AuCacheFuncs(dinfo, DINFO); | |
16631 | +AuCacheFuncs(icntnr, ICNTNR); | |
16632 | +AuCacheFuncs(finfo, FINFO); | |
16633 | +AuCacheFuncs(vdir, VDIR); | |
4a4d8108 AM |
16634 | +AuCacheFuncs(vdir_dehstr, DEHSTR); |
16635 | +#ifdef CONFIG_AUFS_HNOTIFY | |
16636 | +AuCacheFuncs(hnotify, HNOTIFY); | |
16637 | +#endif | |
1facf9fc | 16638 | + |
4a4d8108 AM |
16639 | +#endif /* __KERNEL__ */ |
16640 | +#endif /* __AUFS_MODULE_H__ */ | |
b752ccd1 AM |
16641 | diff -urN /usr/share/empty/fs/aufs/mtx.h linux/fs/aufs/mtx.h |
16642 | --- /usr/share/empty/fs/aufs/mtx.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 16643 | +++ linux/fs/aufs/mtx.h 2010-10-21 09:52:43.093625591 +0200 |
4a4d8108 AM |
16644 | @@ -0,0 +1,48 @@ |
16645 | +/* | |
16646 | + * Copyright (C) 2010 Junjiro R. Okajima | |
16647 | + * | |
16648 | + * This program, aufs is free software; you can redistribute it and/or modify | |
16649 | + * it under the terms of the GNU General Public License as published by | |
16650 | + * the Free Software Foundation; either version 2 of the License, or | |
16651 | + * (at your option) any later version. | |
16652 | + * | |
16653 | + * This program is distributed in the hope that it will be useful, | |
16654 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16655 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16656 | + * GNU General Public License for more details. | |
16657 | + * | |
16658 | + * You should have received a copy of the GNU General Public License | |
16659 | + * along with this program; if not, write to the Free Software | |
16660 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
16661 | + */ | |
16662 | + | |
16663 | +/* | |
16664 | + * very ugly approach for aufs_mmap() | |
16665 | + * never include this file from other than f_op.c. | |
16666 | + * see f_op.c in detail. | |
16667 | + */ | |
16668 | + | |
16669 | +#ifndef __AUFS_MTX_H__ | |
16670 | +#define __AUFS_MTX_H__ | |
16671 | + | |
16672 | +#ifdef __KERNEL__ | |
16673 | + | |
16674 | +/* copied from ../kernel/mutex{,-debug}.h */ | |
16675 | +struct mutex; | |
16676 | +struct thread_info; | |
16677 | +#ifdef CONFIG_DEBUG_MUTEXES | |
16678 | +static inline void mutex_set_owner(struct mutex *lock) | |
16679 | +{ | |
16680 | + lock->owner = current_thread_info(); | |
16681 | +} | |
16682 | +#else | |
16683 | +static inline void mutex_set_owner(struct mutex *lock) | |
16684 | +{ | |
16685 | +#ifdef CONFIG_SMP | |
16686 | + lock->owner = current_thread_info(); | |
16687 | +#endif | |
16688 | +} | |
16689 | +#endif | |
1facf9fc | 16690 | + |
16691 | +#endif /* __KERNEL__ */ | |
4a4d8108 | 16692 | +#endif /* __AUFS_MTX_H__ */ |
b752ccd1 AM |
16693 | diff -urN /usr/share/empty/fs/aufs/opts.c linux/fs/aufs/opts.c |
16694 | --- /usr/share/empty/fs/aufs/opts.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
16695 | +++ linux/fs/aufs/opts.c 2010-10-21 09:52:43.093625591 +0200 |
16696 | @@ -0,0 +1,1571 @@ | |
1facf9fc | 16697 | +/* |
4a4d8108 | 16698 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 16699 | + * |
16700 | + * This program, aufs is free software; you can redistribute it and/or modify | |
16701 | + * it under the terms of the GNU General Public License as published by | |
16702 | + * the Free Software Foundation; either version 2 of the License, or | |
16703 | + * (at your option) any later version. | |
dece6358 AM |
16704 | + * |
16705 | + * This program is distributed in the hope that it will be useful, | |
16706 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16707 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16708 | + * GNU General Public License for more details. | |
16709 | + * | |
16710 | + * You should have received a copy of the GNU General Public License | |
16711 | + * along with this program; if not, write to the Free Software | |
16712 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 16713 | + */ |
16714 | + | |
16715 | +/* | |
16716 | + * mount options/flags | |
16717 | + */ | |
16718 | + | |
dece6358 AM |
16719 | +#include <linux/file.h> |
16720 | +#include <linux/namei.h> | |
1facf9fc | 16721 | +#include <linux/types.h> /* a distribution requires */ |
16722 | +#include <linux/parser.h> | |
16723 | +#include "aufs.h" | |
16724 | + | |
16725 | +/* ---------------------------------------------------------------------- */ | |
16726 | + | |
16727 | +enum { | |
16728 | + Opt_br, | |
16729 | + Opt_add, Opt_del, Opt_mod, Opt_reorder, Opt_append, Opt_prepend, | |
16730 | + Opt_idel, Opt_imod, Opt_ireorder, | |
16731 | + Opt_dirwh, Opt_rdcache, Opt_rdblk, Opt_rdhash, Opt_rendir, | |
dece6358 | 16732 | + Opt_rdblk_def, Opt_rdhash_def, |
1facf9fc | 16733 | + Opt_xino, Opt_zxino, Opt_noxino, |
16734 | + Opt_trunc_xino, Opt_trunc_xino_v, Opt_notrunc_xino, | |
16735 | + Opt_trunc_xino_path, Opt_itrunc_xino, | |
16736 | + Opt_trunc_xib, Opt_notrunc_xib, | |
dece6358 | 16737 | + Opt_shwh, Opt_noshwh, |
1facf9fc | 16738 | + Opt_plink, Opt_noplink, Opt_list_plink, |
16739 | + Opt_udba, | |
4a4d8108 | 16740 | + Opt_dio, Opt_nodio, |
1facf9fc | 16741 | + /* Opt_lock, Opt_unlock, */ |
16742 | + Opt_cmd, Opt_cmd_args, | |
16743 | + Opt_diropq_a, Opt_diropq_w, | |
16744 | + Opt_warn_perm, Opt_nowarn_perm, | |
16745 | + Opt_wbr_copyup, Opt_wbr_create, | |
16746 | + Opt_refrof, Opt_norefrof, | |
16747 | + Opt_verbose, Opt_noverbose, | |
16748 | + Opt_sum, Opt_nosum, Opt_wsum, | |
16749 | + Opt_tail, Opt_ignore, Opt_ignore_silent, Opt_err | |
16750 | +}; | |
16751 | + | |
16752 | +static match_table_t options = { | |
16753 | + {Opt_br, "br=%s"}, | |
16754 | + {Opt_br, "br:%s"}, | |
16755 | + | |
16756 | + {Opt_add, "add=%d:%s"}, | |
16757 | + {Opt_add, "add:%d:%s"}, | |
16758 | + {Opt_add, "ins=%d:%s"}, | |
16759 | + {Opt_add, "ins:%d:%s"}, | |
16760 | + {Opt_append, "append=%s"}, | |
16761 | + {Opt_append, "append:%s"}, | |
16762 | + {Opt_prepend, "prepend=%s"}, | |
16763 | + {Opt_prepend, "prepend:%s"}, | |
16764 | + | |
16765 | + {Opt_del, "del=%s"}, | |
16766 | + {Opt_del, "del:%s"}, | |
16767 | + /* {Opt_idel, "idel:%d"}, */ | |
16768 | + {Opt_mod, "mod=%s"}, | |
16769 | + {Opt_mod, "mod:%s"}, | |
16770 | + /* {Opt_imod, "imod:%d:%s"}, */ | |
16771 | + | |
16772 | + {Opt_dirwh, "dirwh=%d"}, | |
16773 | + | |
16774 | + {Opt_xino, "xino=%s"}, | |
16775 | + {Opt_noxino, "noxino"}, | |
16776 | + {Opt_trunc_xino, "trunc_xino"}, | |
16777 | + {Opt_trunc_xino_v, "trunc_xino_v=%d:%d"}, | |
16778 | + {Opt_notrunc_xino, "notrunc_xino"}, | |
16779 | + {Opt_trunc_xino_path, "trunc_xino=%s"}, | |
16780 | + {Opt_itrunc_xino, "itrunc_xino=%d"}, | |
16781 | + /* {Opt_zxino, "zxino=%s"}, */ | |
16782 | + {Opt_trunc_xib, "trunc_xib"}, | |
16783 | + {Opt_notrunc_xib, "notrunc_xib"}, | |
16784 | + | |
16785 | + {Opt_plink, "plink"}, | |
16786 | + {Opt_noplink, "noplink"}, | |
16787 | +#ifdef CONFIG_AUFS_DEBUG | |
16788 | + {Opt_list_plink, "list_plink"}, | |
16789 | +#endif | |
16790 | + | |
16791 | + {Opt_udba, "udba=%s"}, | |
16792 | + | |
4a4d8108 AM |
16793 | + {Opt_dio, "dio"}, |
16794 | + {Opt_nodio, "nodio"}, | |
16795 | + | |
1facf9fc | 16796 | + {Opt_diropq_a, "diropq=always"}, |
16797 | + {Opt_diropq_a, "diropq=a"}, | |
16798 | + {Opt_diropq_w, "diropq=whiteouted"}, | |
16799 | + {Opt_diropq_w, "diropq=w"}, | |
16800 | + | |
16801 | + {Opt_warn_perm, "warn_perm"}, | |
16802 | + {Opt_nowarn_perm, "nowarn_perm"}, | |
16803 | + | |
16804 | + /* keep them temporary */ | |
16805 | + {Opt_ignore_silent, "coo=%s"}, | |
16806 | + {Opt_ignore_silent, "nodlgt"}, | |
16807 | + {Opt_ignore_silent, "nodirperm1"}, | |
1facf9fc | 16808 | + {Opt_ignore_silent, "clean_plink"}, |
16809 | + | |
dece6358 AM |
16810 | +#ifdef CONFIG_AUFS_SHWH |
16811 | + {Opt_shwh, "shwh"}, | |
16812 | +#endif | |
16813 | + {Opt_noshwh, "noshwh"}, | |
16814 | + | |
1facf9fc | 16815 | + {Opt_rendir, "rendir=%d"}, |
16816 | + | |
16817 | + {Opt_refrof, "refrof"}, | |
16818 | + {Opt_norefrof, "norefrof"}, | |
16819 | + | |
16820 | + {Opt_verbose, "verbose"}, | |
16821 | + {Opt_verbose, "v"}, | |
16822 | + {Opt_noverbose, "noverbose"}, | |
16823 | + {Opt_noverbose, "quiet"}, | |
16824 | + {Opt_noverbose, "q"}, | |
16825 | + {Opt_noverbose, "silent"}, | |
16826 | + | |
16827 | + {Opt_sum, "sum"}, | |
16828 | + {Opt_nosum, "nosum"}, | |
16829 | + {Opt_wsum, "wsum"}, | |
16830 | + | |
16831 | + {Opt_rdcache, "rdcache=%d"}, | |
16832 | + {Opt_rdblk, "rdblk=%d"}, | |
dece6358 | 16833 | + {Opt_rdblk_def, "rdblk=def"}, |
1facf9fc | 16834 | + {Opt_rdhash, "rdhash=%d"}, |
dece6358 | 16835 | + {Opt_rdhash_def, "rdhash=def"}, |
1facf9fc | 16836 | + |
16837 | + {Opt_wbr_create, "create=%s"}, | |
16838 | + {Opt_wbr_create, "create_policy=%s"}, | |
16839 | + {Opt_wbr_copyup, "cpup=%s"}, | |
16840 | + {Opt_wbr_copyup, "copyup=%s"}, | |
16841 | + {Opt_wbr_copyup, "copyup_policy=%s"}, | |
16842 | + | |
16843 | + /* internal use for the scripts */ | |
16844 | + {Opt_ignore_silent, "si=%s"}, | |
16845 | + | |
16846 | + {Opt_br, "dirs=%s"}, | |
16847 | + {Opt_ignore, "debug=%d"}, | |
16848 | + {Opt_ignore, "delete=whiteout"}, | |
16849 | + {Opt_ignore, "delete=all"}, | |
16850 | + {Opt_ignore, "imap=%s"}, | |
16851 | + | |
1308ab2a | 16852 | + /* temporary workaround, due to old mount(8)? */ |
16853 | + {Opt_ignore_silent, "relatime"}, | |
16854 | + | |
1facf9fc | 16855 | + {Opt_err, NULL} |
16856 | +}; | |
16857 | + | |
16858 | +/* ---------------------------------------------------------------------- */ | |
16859 | + | |
16860 | +static const char *au_parser_pattern(int val, struct match_token *token) | |
16861 | +{ | |
16862 | + while (token->pattern) { | |
16863 | + if (token->token == val) | |
16864 | + return token->pattern; | |
16865 | + token++; | |
16866 | + } | |
16867 | + BUG(); | |
16868 | + return "??"; | |
16869 | +} | |
16870 | + | |
16871 | +/* ---------------------------------------------------------------------- */ | |
16872 | + | |
16873 | +static match_table_t brperms = { | |
16874 | + {AuBrPerm_RO, AUFS_BRPERM_RO}, | |
16875 | + {AuBrPerm_RR, AUFS_BRPERM_RR}, | |
16876 | + {AuBrPerm_RW, AUFS_BRPERM_RW}, | |
16877 | + | |
16878 | + {AuBrPerm_ROWH, AUFS_BRPERM_ROWH}, | |
16879 | + {AuBrPerm_RRWH, AUFS_BRPERM_RRWH}, | |
16880 | + {AuBrPerm_RWNoLinkWH, AUFS_BRPERM_RWNLWH}, | |
16881 | + | |
16882 | + {AuBrPerm_ROWH, "nfsro"}, | |
16883 | + {AuBrPerm_RO, NULL} | |
16884 | +}; | |
16885 | + | |
4a4d8108 | 16886 | +static int noinline_for_stack br_perm_val(char *perm) |
1facf9fc | 16887 | +{ |
16888 | + int val; | |
16889 | + substring_t args[MAX_OPT_ARGS]; | |
16890 | + | |
16891 | + val = match_token(perm, brperms, args); | |
16892 | + return val; | |
16893 | +} | |
16894 | + | |
16895 | +const char *au_optstr_br_perm(int brperm) | |
16896 | +{ | |
16897 | + return au_parser_pattern(brperm, (void *)brperms); | |
16898 | +} | |
16899 | + | |
16900 | +/* ---------------------------------------------------------------------- */ | |
16901 | + | |
16902 | +static match_table_t udbalevel = { | |
16903 | + {AuOpt_UDBA_REVAL, "reval"}, | |
16904 | + {AuOpt_UDBA_NONE, "none"}, | |
4a4d8108 AM |
16905 | +#ifdef CONFIG_AUFS_HNOTIFY |
16906 | + {AuOpt_UDBA_HNOTIFY, "notify"}, /* abstraction */ | |
16907 | +#ifdef CONFIG_AUFS_HFSNOTIFY | |
16908 | + {AuOpt_UDBA_HNOTIFY, "fsnotify"}, | |
4a4d8108 | 16909 | +#endif |
1facf9fc | 16910 | +#endif |
16911 | + {-1, NULL} | |
16912 | +}; | |
16913 | + | |
4a4d8108 | 16914 | +static int noinline_for_stack udba_val(char *str) |
1facf9fc | 16915 | +{ |
16916 | + substring_t args[MAX_OPT_ARGS]; | |
16917 | + | |
953406b4 | 16918 | + return match_token(str, udbalevel, args); |
1facf9fc | 16919 | +} |
16920 | + | |
16921 | +const char *au_optstr_udba(int udba) | |
16922 | +{ | |
16923 | + return au_parser_pattern(udba, (void *)udbalevel); | |
16924 | +} | |
16925 | + | |
16926 | +/* ---------------------------------------------------------------------- */ | |
16927 | + | |
16928 | +static match_table_t au_wbr_create_policy = { | |
16929 | + {AuWbrCreate_TDP, "tdp"}, | |
16930 | + {AuWbrCreate_TDP, "top-down-parent"}, | |
16931 | + {AuWbrCreate_RR, "rr"}, | |
16932 | + {AuWbrCreate_RR, "round-robin"}, | |
16933 | + {AuWbrCreate_MFS, "mfs"}, | |
16934 | + {AuWbrCreate_MFS, "most-free-space"}, | |
16935 | + {AuWbrCreate_MFSV, "mfs:%d"}, | |
16936 | + {AuWbrCreate_MFSV, "most-free-space:%d"}, | |
16937 | + | |
16938 | + {AuWbrCreate_MFSRR, "mfsrr:%d"}, | |
16939 | + {AuWbrCreate_MFSRRV, "mfsrr:%d:%d"}, | |
16940 | + {AuWbrCreate_PMFS, "pmfs"}, | |
16941 | + {AuWbrCreate_PMFSV, "pmfs:%d"}, | |
16942 | + | |
16943 | + {-1, NULL} | |
16944 | +}; | |
16945 | + | |
dece6358 AM |
16946 | +/* |
16947 | + * cf. linux/lib/parser.c and cmdline.c | |
16948 | + * gave up calling memparse() since it uses simple_strtoull() instead of | |
16949 | + * strict_...(). | |
16950 | + */ | |
4a4d8108 AM |
16951 | +static int noinline_for_stack |
16952 | +au_match_ull(substring_t *s, unsigned long long *result) | |
1facf9fc | 16953 | +{ |
16954 | + int err; | |
16955 | + unsigned int len; | |
16956 | + char a[32]; | |
16957 | + | |
16958 | + err = -ERANGE; | |
16959 | + len = s->to - s->from; | |
16960 | + if (len + 1 <= sizeof(a)) { | |
16961 | + memcpy(a, s->from, len); | |
16962 | + a[len] = '\0'; | |
16963 | + err = strict_strtoull(a, 0, result); | |
16964 | + } | |
16965 | + return err; | |
16966 | +} | |
16967 | + | |
16968 | +static int au_wbr_mfs_wmark(substring_t *arg, char *str, | |
16969 | + struct au_opt_wbr_create *create) | |
16970 | +{ | |
16971 | + int err; | |
16972 | + unsigned long long ull; | |
16973 | + | |
16974 | + err = 0; | |
16975 | + if (!au_match_ull(arg, &ull)) | |
16976 | + create->mfsrr_watermark = ull; | |
16977 | + else { | |
4a4d8108 | 16978 | + pr_err("bad integer in %s\n", str); |
1facf9fc | 16979 | + err = -EINVAL; |
16980 | + } | |
16981 | + | |
16982 | + return err; | |
16983 | +} | |
16984 | + | |
16985 | +static int au_wbr_mfs_sec(substring_t *arg, char *str, | |
16986 | + struct au_opt_wbr_create *create) | |
16987 | +{ | |
16988 | + int n, err; | |
16989 | + | |
16990 | + err = 0; | |
953406b4 | 16991 | + if (!match_int(arg, &n) && 0 <= n) |
1facf9fc | 16992 | + create->mfs_second = n; |
16993 | + else { | |
4a4d8108 | 16994 | + pr_err("bad integer in %s\n", str); |
1facf9fc | 16995 | + err = -EINVAL; |
16996 | + } | |
16997 | + | |
16998 | + return err; | |
16999 | +} | |
17000 | + | |
4a4d8108 AM |
17001 | +static int noinline_for_stack |
17002 | +au_wbr_create_val(char *str, struct au_opt_wbr_create *create) | |
1facf9fc | 17003 | +{ |
17004 | + int err, e; | |
17005 | + substring_t args[MAX_OPT_ARGS]; | |
17006 | + | |
17007 | + err = match_token(str, au_wbr_create_policy, args); | |
17008 | + create->wbr_create = err; | |
17009 | + switch (err) { | |
17010 | + case AuWbrCreate_MFSRRV: | |
17011 | + e = au_wbr_mfs_wmark(&args[0], str, create); | |
17012 | + if (!e) | |
17013 | + e = au_wbr_mfs_sec(&args[1], str, create); | |
17014 | + if (unlikely(e)) | |
17015 | + err = e; | |
17016 | + break; | |
17017 | + case AuWbrCreate_MFSRR: | |
17018 | + e = au_wbr_mfs_wmark(&args[0], str, create); | |
17019 | + if (unlikely(e)) { | |
17020 | + err = e; | |
17021 | + break; | |
17022 | + } | |
17023 | + /*FALLTHROUGH*/ | |
17024 | + case AuWbrCreate_MFS: | |
17025 | + case AuWbrCreate_PMFS: | |
17026 | + create->mfs_second = AUFS_MFS_SECOND_DEF; | |
17027 | + break; | |
17028 | + case AuWbrCreate_MFSV: | |
17029 | + case AuWbrCreate_PMFSV: | |
17030 | + e = au_wbr_mfs_sec(&args[0], str, create); | |
17031 | + if (unlikely(e)) | |
17032 | + err = e; | |
17033 | + break; | |
17034 | + } | |
17035 | + | |
17036 | + return err; | |
17037 | +} | |
17038 | + | |
17039 | +const char *au_optstr_wbr_create(int wbr_create) | |
17040 | +{ | |
17041 | + return au_parser_pattern(wbr_create, (void *)au_wbr_create_policy); | |
17042 | +} | |
17043 | + | |
17044 | +static match_table_t au_wbr_copyup_policy = { | |
17045 | + {AuWbrCopyup_TDP, "tdp"}, | |
17046 | + {AuWbrCopyup_TDP, "top-down-parent"}, | |
17047 | + {AuWbrCopyup_BUP, "bup"}, | |
17048 | + {AuWbrCopyup_BUP, "bottom-up-parent"}, | |
17049 | + {AuWbrCopyup_BU, "bu"}, | |
17050 | + {AuWbrCopyup_BU, "bottom-up"}, | |
17051 | + {-1, NULL} | |
17052 | +}; | |
17053 | + | |
4a4d8108 | 17054 | +static int noinline_for_stack au_wbr_copyup_val(char *str) |
1facf9fc | 17055 | +{ |
17056 | + substring_t args[MAX_OPT_ARGS]; | |
17057 | + | |
17058 | + return match_token(str, au_wbr_copyup_policy, args); | |
17059 | +} | |
17060 | + | |
17061 | +const char *au_optstr_wbr_copyup(int wbr_copyup) | |
17062 | +{ | |
17063 | + return au_parser_pattern(wbr_copyup, (void *)au_wbr_copyup_policy); | |
17064 | +} | |
17065 | + | |
17066 | +/* ---------------------------------------------------------------------- */ | |
17067 | + | |
17068 | +static const int lkup_dirflags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY; | |
17069 | + | |
17070 | +static void dump_opts(struct au_opts *opts) | |
17071 | +{ | |
17072 | +#ifdef CONFIG_AUFS_DEBUG | |
17073 | + /* reduce stack space */ | |
17074 | + union { | |
17075 | + struct au_opt_add *add; | |
17076 | + struct au_opt_del *del; | |
17077 | + struct au_opt_mod *mod; | |
17078 | + struct au_opt_xino *xino; | |
17079 | + struct au_opt_xino_itrunc *xino_itrunc; | |
17080 | + struct au_opt_wbr_create *create; | |
17081 | + } u; | |
17082 | + struct au_opt *opt; | |
17083 | + | |
17084 | + opt = opts->opt; | |
17085 | + while (opt->type != Opt_tail) { | |
17086 | + switch (opt->type) { | |
17087 | + case Opt_add: | |
17088 | + u.add = &opt->add; | |
17089 | + AuDbg("add {b%d, %s, 0x%x, %p}\n", | |
17090 | + u.add->bindex, u.add->pathname, u.add->perm, | |
17091 | + u.add->path.dentry); | |
17092 | + break; | |
17093 | + case Opt_del: | |
17094 | + case Opt_idel: | |
17095 | + u.del = &opt->del; | |
17096 | + AuDbg("del {%s, %p}\n", | |
17097 | + u.del->pathname, u.del->h_path.dentry); | |
17098 | + break; | |
17099 | + case Opt_mod: | |
17100 | + case Opt_imod: | |
17101 | + u.mod = &opt->mod; | |
17102 | + AuDbg("mod {%s, 0x%x, %p}\n", | |
17103 | + u.mod->path, u.mod->perm, u.mod->h_root); | |
17104 | + break; | |
17105 | + case Opt_append: | |
17106 | + u.add = &opt->add; | |
17107 | + AuDbg("append {b%d, %s, 0x%x, %p}\n", | |
17108 | + u.add->bindex, u.add->pathname, u.add->perm, | |
17109 | + u.add->path.dentry); | |
17110 | + break; | |
17111 | + case Opt_prepend: | |
17112 | + u.add = &opt->add; | |
17113 | + AuDbg("prepend {b%d, %s, 0x%x, %p}\n", | |
17114 | + u.add->bindex, u.add->pathname, u.add->perm, | |
17115 | + u.add->path.dentry); | |
17116 | + break; | |
17117 | + case Opt_dirwh: | |
17118 | + AuDbg("dirwh %d\n", opt->dirwh); | |
17119 | + break; | |
17120 | + case Opt_rdcache: | |
17121 | + AuDbg("rdcache %d\n", opt->rdcache); | |
17122 | + break; | |
17123 | + case Opt_rdblk: | |
17124 | + AuDbg("rdblk %u\n", opt->rdblk); | |
17125 | + break; | |
dece6358 AM |
17126 | + case Opt_rdblk_def: |
17127 | + AuDbg("rdblk_def\n"); | |
17128 | + break; | |
1facf9fc | 17129 | + case Opt_rdhash: |
17130 | + AuDbg("rdhash %u\n", opt->rdhash); | |
17131 | + break; | |
dece6358 AM |
17132 | + case Opt_rdhash_def: |
17133 | + AuDbg("rdhash_def\n"); | |
17134 | + break; | |
1facf9fc | 17135 | + case Opt_xino: |
17136 | + u.xino = &opt->xino; | |
17137 | + AuDbg("xino {%s %.*s}\n", | |
17138 | + u.xino->path, | |
17139 | + AuDLNPair(u.xino->file->f_dentry)); | |
17140 | + break; | |
17141 | + case Opt_trunc_xino: | |
17142 | + AuLabel(trunc_xino); | |
17143 | + break; | |
17144 | + case Opt_notrunc_xino: | |
17145 | + AuLabel(notrunc_xino); | |
17146 | + break; | |
17147 | + case Opt_trunc_xino_path: | |
17148 | + case Opt_itrunc_xino: | |
17149 | + u.xino_itrunc = &opt->xino_itrunc; | |
17150 | + AuDbg("trunc_xino %d\n", u.xino_itrunc->bindex); | |
17151 | + break; | |
17152 | + | |
17153 | + case Opt_noxino: | |
17154 | + AuLabel(noxino); | |
17155 | + break; | |
17156 | + case Opt_trunc_xib: | |
17157 | + AuLabel(trunc_xib); | |
17158 | + break; | |
17159 | + case Opt_notrunc_xib: | |
17160 | + AuLabel(notrunc_xib); | |
17161 | + break; | |
dece6358 AM |
17162 | + case Opt_shwh: |
17163 | + AuLabel(shwh); | |
17164 | + break; | |
17165 | + case Opt_noshwh: | |
17166 | + AuLabel(noshwh); | |
17167 | + break; | |
1facf9fc | 17168 | + case Opt_plink: |
17169 | + AuLabel(plink); | |
17170 | + break; | |
17171 | + case Opt_noplink: | |
17172 | + AuLabel(noplink); | |
17173 | + break; | |
17174 | + case Opt_list_plink: | |
17175 | + AuLabel(list_plink); | |
17176 | + break; | |
17177 | + case Opt_udba: | |
17178 | + AuDbg("udba %d, %s\n", | |
17179 | + opt->udba, au_optstr_udba(opt->udba)); | |
17180 | + break; | |
4a4d8108 AM |
17181 | + case Opt_dio: |
17182 | + AuLabel(dio); | |
17183 | + break; | |
17184 | + case Opt_nodio: | |
17185 | + AuLabel(nodio); | |
17186 | + break; | |
1facf9fc | 17187 | + case Opt_diropq_a: |
17188 | + AuLabel(diropq_a); | |
17189 | + break; | |
17190 | + case Opt_diropq_w: | |
17191 | + AuLabel(diropq_w); | |
17192 | + break; | |
17193 | + case Opt_warn_perm: | |
17194 | + AuLabel(warn_perm); | |
17195 | + break; | |
17196 | + case Opt_nowarn_perm: | |
17197 | + AuLabel(nowarn_perm); | |
17198 | + break; | |
17199 | + case Opt_refrof: | |
17200 | + AuLabel(refrof); | |
17201 | + break; | |
17202 | + case Opt_norefrof: | |
17203 | + AuLabel(norefrof); | |
17204 | + break; | |
17205 | + case Opt_verbose: | |
17206 | + AuLabel(verbose); | |
17207 | + break; | |
17208 | + case Opt_noverbose: | |
17209 | + AuLabel(noverbose); | |
17210 | + break; | |
17211 | + case Opt_sum: | |
17212 | + AuLabel(sum); | |
17213 | + break; | |
17214 | + case Opt_nosum: | |
17215 | + AuLabel(nosum); | |
17216 | + break; | |
17217 | + case Opt_wsum: | |
17218 | + AuLabel(wsum); | |
17219 | + break; | |
17220 | + case Opt_wbr_create: | |
17221 | + u.create = &opt->wbr_create; | |
17222 | + AuDbg("create %d, %s\n", u.create->wbr_create, | |
17223 | + au_optstr_wbr_create(u.create->wbr_create)); | |
17224 | + switch (u.create->wbr_create) { | |
17225 | + case AuWbrCreate_MFSV: | |
17226 | + case AuWbrCreate_PMFSV: | |
17227 | + AuDbg("%d sec\n", u.create->mfs_second); | |
17228 | + break; | |
17229 | + case AuWbrCreate_MFSRR: | |
17230 | + AuDbg("%llu watermark\n", | |
17231 | + u.create->mfsrr_watermark); | |
17232 | + break; | |
17233 | + case AuWbrCreate_MFSRRV: | |
17234 | + AuDbg("%llu watermark, %d sec\n", | |
17235 | + u.create->mfsrr_watermark, | |
17236 | + u.create->mfs_second); | |
17237 | + break; | |
17238 | + } | |
17239 | + break; | |
17240 | + case Opt_wbr_copyup: | |
17241 | + AuDbg("copyup %d, %s\n", opt->wbr_copyup, | |
17242 | + au_optstr_wbr_copyup(opt->wbr_copyup)); | |
17243 | + break; | |
17244 | + default: | |
17245 | + BUG(); | |
17246 | + } | |
17247 | + opt++; | |
17248 | + } | |
17249 | +#endif | |
17250 | +} | |
17251 | + | |
17252 | +void au_opts_free(struct au_opts *opts) | |
17253 | +{ | |
17254 | + struct au_opt *opt; | |
17255 | + | |
17256 | + opt = opts->opt; | |
17257 | + while (opt->type != Opt_tail) { | |
17258 | + switch (opt->type) { | |
17259 | + case Opt_add: | |
17260 | + case Opt_append: | |
17261 | + case Opt_prepend: | |
17262 | + path_put(&opt->add.path); | |
17263 | + break; | |
17264 | + case Opt_del: | |
17265 | + case Opt_idel: | |
17266 | + path_put(&opt->del.h_path); | |
17267 | + break; | |
17268 | + case Opt_mod: | |
17269 | + case Opt_imod: | |
17270 | + dput(opt->mod.h_root); | |
17271 | + break; | |
17272 | + case Opt_xino: | |
17273 | + fput(opt->xino.file); | |
17274 | + break; | |
17275 | + } | |
17276 | + opt++; | |
17277 | + } | |
17278 | +} | |
17279 | + | |
17280 | +static int opt_add(struct au_opt *opt, char *opt_str, unsigned long sb_flags, | |
17281 | + aufs_bindex_t bindex) | |
17282 | +{ | |
17283 | + int err; | |
17284 | + struct au_opt_add *add = &opt->add; | |
17285 | + char *p; | |
17286 | + | |
17287 | + add->bindex = bindex; | |
17288 | + add->perm = AuBrPerm_Last; | |
17289 | + add->pathname = opt_str; | |
17290 | + p = strchr(opt_str, '='); | |
17291 | + if (p) { | |
17292 | + *p++ = 0; | |
17293 | + if (*p) | |
17294 | + add->perm = br_perm_val(p); | |
17295 | + } | |
17296 | + | |
17297 | + err = vfsub_kern_path(add->pathname, lkup_dirflags, &add->path); | |
17298 | + if (!err) { | |
17299 | + if (!p) { | |
17300 | + add->perm = AuBrPerm_RO; | |
17301 | + if (au_test_fs_rr(add->path.dentry->d_sb)) | |
17302 | + add->perm = AuBrPerm_RR; | |
17303 | + else if (!bindex && !(sb_flags & MS_RDONLY)) | |
17304 | + add->perm = AuBrPerm_RW; | |
17305 | + } | |
17306 | + opt->type = Opt_add; | |
17307 | + goto out; | |
17308 | + } | |
4a4d8108 | 17309 | + pr_err("lookup failed %s (%d)\n", add->pathname, err); |
1facf9fc | 17310 | + err = -EINVAL; |
17311 | + | |
4f0767ce | 17312 | +out: |
1facf9fc | 17313 | + return err; |
17314 | +} | |
17315 | + | |
17316 | +static int au_opts_parse_del(struct au_opt_del *del, substring_t args[]) | |
17317 | +{ | |
17318 | + int err; | |
17319 | + | |
17320 | + del->pathname = args[0].from; | |
17321 | + AuDbg("del path %s\n", del->pathname); | |
17322 | + | |
17323 | + err = vfsub_kern_path(del->pathname, lkup_dirflags, &del->h_path); | |
17324 | + if (unlikely(err)) | |
4a4d8108 | 17325 | + pr_err("lookup failed %s (%d)\n", del->pathname, err); |
1facf9fc | 17326 | + |
17327 | + return err; | |
17328 | +} | |
17329 | + | |
17330 | +#if 0 /* reserved for future use */ | |
17331 | +static int au_opts_parse_idel(struct super_block *sb, aufs_bindex_t bindex, | |
17332 | + struct au_opt_del *del, substring_t args[]) | |
17333 | +{ | |
17334 | + int err; | |
17335 | + struct dentry *root; | |
17336 | + | |
17337 | + err = -EINVAL; | |
17338 | + root = sb->s_root; | |
17339 | + aufs_read_lock(root, AuLock_FLUSH); | |
17340 | + if (bindex < 0 || au_sbend(sb) < bindex) { | |
4a4d8108 | 17341 | + pr_err("out of bounds, %d\n", bindex); |
1facf9fc | 17342 | + goto out; |
17343 | + } | |
17344 | + | |
17345 | + err = 0; | |
17346 | + del->h_path.dentry = dget(au_h_dptr(root, bindex)); | |
17347 | + del->h_path.mnt = mntget(au_sbr_mnt(sb, bindex)); | |
17348 | + | |
4f0767ce | 17349 | +out: |
1facf9fc | 17350 | + aufs_read_unlock(root, !AuLock_IR); |
17351 | + return err; | |
17352 | +} | |
17353 | +#endif | |
17354 | + | |
4a4d8108 AM |
17355 | +static int noinline_for_stack |
17356 | +au_opts_parse_mod(struct au_opt_mod *mod, substring_t args[]) | |
1facf9fc | 17357 | +{ |
17358 | + int err; | |
17359 | + struct path path; | |
17360 | + char *p; | |
17361 | + | |
17362 | + err = -EINVAL; | |
17363 | + mod->path = args[0].from; | |
17364 | + p = strchr(mod->path, '='); | |
17365 | + if (unlikely(!p)) { | |
4a4d8108 | 17366 | + pr_err("no permssion %s\n", args[0].from); |
1facf9fc | 17367 | + goto out; |
17368 | + } | |
17369 | + | |
17370 | + *p++ = 0; | |
17371 | + err = vfsub_kern_path(mod->path, lkup_dirflags, &path); | |
17372 | + if (unlikely(err)) { | |
4a4d8108 | 17373 | + pr_err("lookup failed %s (%d)\n", mod->path, err); |
1facf9fc | 17374 | + goto out; |
17375 | + } | |
17376 | + | |
17377 | + mod->perm = br_perm_val(p); | |
17378 | + AuDbg("mod path %s, perm 0x%x, %s\n", mod->path, mod->perm, p); | |
17379 | + mod->h_root = dget(path.dentry); | |
17380 | + path_put(&path); | |
17381 | + | |
4f0767ce | 17382 | +out: |
1facf9fc | 17383 | + return err; |
17384 | +} | |
17385 | + | |
17386 | +#if 0 /* reserved for future use */ | |
17387 | +static int au_opts_parse_imod(struct super_block *sb, aufs_bindex_t bindex, | |
17388 | + struct au_opt_mod *mod, substring_t args[]) | |
17389 | +{ | |
17390 | + int err; | |
17391 | + struct dentry *root; | |
17392 | + | |
17393 | + err = -EINVAL; | |
17394 | + root = sb->s_root; | |
17395 | + aufs_read_lock(root, AuLock_FLUSH); | |
17396 | + if (bindex < 0 || au_sbend(sb) < bindex) { | |
4a4d8108 | 17397 | + pr_err("out of bounds, %d\n", bindex); |
1facf9fc | 17398 | + goto out; |
17399 | + } | |
17400 | + | |
17401 | + err = 0; | |
17402 | + mod->perm = br_perm_val(args[1].from); | |
17403 | + AuDbg("mod path %s, perm 0x%x, %s\n", | |
17404 | + mod->path, mod->perm, args[1].from); | |
17405 | + mod->h_root = dget(au_h_dptr(root, bindex)); | |
17406 | + | |
4f0767ce | 17407 | +out: |
1facf9fc | 17408 | + aufs_read_unlock(root, !AuLock_IR); |
17409 | + return err; | |
17410 | +} | |
17411 | +#endif | |
17412 | + | |
17413 | +static int au_opts_parse_xino(struct super_block *sb, struct au_opt_xino *xino, | |
17414 | + substring_t args[]) | |
17415 | +{ | |
17416 | + int err; | |
17417 | + struct file *file; | |
17418 | + | |
17419 | + file = au_xino_create(sb, args[0].from, /*silent*/0); | |
17420 | + err = PTR_ERR(file); | |
17421 | + if (IS_ERR(file)) | |
17422 | + goto out; | |
17423 | + | |
17424 | + err = -EINVAL; | |
17425 | + if (unlikely(file->f_dentry->d_sb == sb)) { | |
17426 | + fput(file); | |
4a4d8108 | 17427 | + pr_err("%s must be outside\n", args[0].from); |
1facf9fc | 17428 | + goto out; |
17429 | + } | |
17430 | + | |
17431 | + err = 0; | |
17432 | + xino->file = file; | |
17433 | + xino->path = args[0].from; | |
17434 | + | |
4f0767ce | 17435 | +out: |
1facf9fc | 17436 | + return err; |
17437 | +} | |
17438 | + | |
4a4d8108 AM |
17439 | +static int noinline_for_stack |
17440 | +au_opts_parse_xino_itrunc_path(struct super_block *sb, | |
17441 | + struct au_opt_xino_itrunc *xino_itrunc, | |
17442 | + substring_t args[]) | |
1facf9fc | 17443 | +{ |
17444 | + int err; | |
17445 | + aufs_bindex_t bend, bindex; | |
17446 | + struct path path; | |
17447 | + struct dentry *root; | |
17448 | + | |
17449 | + err = vfsub_kern_path(args[0].from, lkup_dirflags, &path); | |
17450 | + if (unlikely(err)) { | |
4a4d8108 | 17451 | + pr_err("lookup failed %s (%d)\n", args[0].from, err); |
1facf9fc | 17452 | + goto out; |
17453 | + } | |
17454 | + | |
17455 | + xino_itrunc->bindex = -1; | |
17456 | + root = sb->s_root; | |
17457 | + aufs_read_lock(root, AuLock_FLUSH); | |
17458 | + bend = au_sbend(sb); | |
17459 | + for (bindex = 0; bindex <= bend; bindex++) { | |
17460 | + if (au_h_dptr(root, bindex) == path.dentry) { | |
17461 | + xino_itrunc->bindex = bindex; | |
17462 | + break; | |
17463 | + } | |
17464 | + } | |
17465 | + aufs_read_unlock(root, !AuLock_IR); | |
17466 | + path_put(&path); | |
17467 | + | |
17468 | + if (unlikely(xino_itrunc->bindex < 0)) { | |
4a4d8108 | 17469 | + pr_err("no such branch %s\n", args[0].from); |
1facf9fc | 17470 | + err = -EINVAL; |
17471 | + } | |
17472 | + | |
4f0767ce | 17473 | +out: |
1facf9fc | 17474 | + return err; |
17475 | +} | |
17476 | + | |
17477 | +/* called without aufs lock */ | |
17478 | +int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts) | |
17479 | +{ | |
17480 | + int err, n, token; | |
17481 | + aufs_bindex_t bindex; | |
17482 | + unsigned char skipped; | |
17483 | + struct dentry *root; | |
17484 | + struct au_opt *opt, *opt_tail; | |
17485 | + char *opt_str; | |
17486 | + /* reduce the stack space */ | |
17487 | + union { | |
17488 | + struct au_opt_xino_itrunc *xino_itrunc; | |
17489 | + struct au_opt_wbr_create *create; | |
17490 | + } u; | |
17491 | + struct { | |
17492 | + substring_t args[MAX_OPT_ARGS]; | |
17493 | + } *a; | |
17494 | + | |
17495 | + err = -ENOMEM; | |
17496 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
17497 | + if (unlikely(!a)) | |
17498 | + goto out; | |
17499 | + | |
17500 | + root = sb->s_root; | |
17501 | + err = 0; | |
17502 | + bindex = 0; | |
17503 | + opt = opts->opt; | |
17504 | + opt_tail = opt + opts->max_opt - 1; | |
17505 | + opt->type = Opt_tail; | |
17506 | + while (!err && (opt_str = strsep(&str, ",")) && *opt_str) { | |
17507 | + err = -EINVAL; | |
17508 | + skipped = 0; | |
17509 | + token = match_token(opt_str, options, a->args); | |
17510 | + switch (token) { | |
17511 | + case Opt_br: | |
17512 | + err = 0; | |
17513 | + while (!err && (opt_str = strsep(&a->args[0].from, ":")) | |
17514 | + && *opt_str) { | |
17515 | + err = opt_add(opt, opt_str, opts->sb_flags, | |
17516 | + bindex++); | |
17517 | + if (unlikely(!err && ++opt > opt_tail)) { | |
17518 | + err = -E2BIG; | |
17519 | + break; | |
17520 | + } | |
17521 | + opt->type = Opt_tail; | |
17522 | + skipped = 1; | |
17523 | + } | |
17524 | + break; | |
17525 | + case Opt_add: | |
17526 | + if (unlikely(match_int(&a->args[0], &n))) { | |
4a4d8108 | 17527 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 17528 | + break; |
17529 | + } | |
17530 | + bindex = n; | |
17531 | + err = opt_add(opt, a->args[1].from, opts->sb_flags, | |
17532 | + bindex); | |
17533 | + if (!err) | |
17534 | + opt->type = token; | |
17535 | + break; | |
17536 | + case Opt_append: | |
17537 | + err = opt_add(opt, a->args[0].from, opts->sb_flags, | |
17538 | + /*dummy bindex*/1); | |
17539 | + if (!err) | |
17540 | + opt->type = token; | |
17541 | + break; | |
17542 | + case Opt_prepend: | |
17543 | + err = opt_add(opt, a->args[0].from, opts->sb_flags, | |
17544 | + /*bindex*/0); | |
17545 | + if (!err) | |
17546 | + opt->type = token; | |
17547 | + break; | |
17548 | + case Opt_del: | |
17549 | + err = au_opts_parse_del(&opt->del, a->args); | |
17550 | + if (!err) | |
17551 | + opt->type = token; | |
17552 | + break; | |
17553 | +#if 0 /* reserved for future use */ | |
17554 | + case Opt_idel: | |
17555 | + del->pathname = "(indexed)"; | |
17556 | + if (unlikely(match_int(&args[0], &n))) { | |
4a4d8108 | 17557 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 17558 | + break; |
17559 | + } | |
17560 | + err = au_opts_parse_idel(sb, n, &opt->del, a->args); | |
17561 | + if (!err) | |
17562 | + opt->type = token; | |
17563 | + break; | |
17564 | +#endif | |
17565 | + case Opt_mod: | |
17566 | + err = au_opts_parse_mod(&opt->mod, a->args); | |
17567 | + if (!err) | |
17568 | + opt->type = token; | |
17569 | + break; | |
17570 | +#ifdef IMOD /* reserved for future use */ | |
17571 | + case Opt_imod: | |
17572 | + u.mod->path = "(indexed)"; | |
17573 | + if (unlikely(match_int(&a->args[0], &n))) { | |
4a4d8108 | 17574 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 17575 | + break; |
17576 | + } | |
17577 | + err = au_opts_parse_imod(sb, n, &opt->mod, a->args); | |
17578 | + if (!err) | |
17579 | + opt->type = token; | |
17580 | + break; | |
17581 | +#endif | |
17582 | + case Opt_xino: | |
17583 | + err = au_opts_parse_xino(sb, &opt->xino, a->args); | |
17584 | + if (!err) | |
17585 | + opt->type = token; | |
17586 | + break; | |
17587 | + | |
17588 | + case Opt_trunc_xino_path: | |
17589 | + err = au_opts_parse_xino_itrunc_path | |
17590 | + (sb, &opt->xino_itrunc, a->args); | |
17591 | + if (!err) | |
17592 | + opt->type = token; | |
17593 | + break; | |
17594 | + | |
17595 | + case Opt_itrunc_xino: | |
17596 | + u.xino_itrunc = &opt->xino_itrunc; | |
17597 | + if (unlikely(match_int(&a->args[0], &n))) { | |
4a4d8108 | 17598 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 17599 | + break; |
17600 | + } | |
17601 | + u.xino_itrunc->bindex = n; | |
17602 | + aufs_read_lock(root, AuLock_FLUSH); | |
17603 | + if (n < 0 || au_sbend(sb) < n) { | |
4a4d8108 | 17604 | + pr_err("out of bounds, %d\n", n); |
1facf9fc | 17605 | + aufs_read_unlock(root, !AuLock_IR); |
17606 | + break; | |
17607 | + } | |
17608 | + aufs_read_unlock(root, !AuLock_IR); | |
17609 | + err = 0; | |
17610 | + opt->type = token; | |
17611 | + break; | |
17612 | + | |
17613 | + case Opt_dirwh: | |
17614 | + if (unlikely(match_int(&a->args[0], &opt->dirwh))) | |
17615 | + break; | |
17616 | + err = 0; | |
17617 | + opt->type = token; | |
17618 | + break; | |
17619 | + | |
17620 | + case Opt_rdcache: | |
953406b4 | 17621 | + if (unlikely(match_int(&a->args[0], &opt->rdcache))) |
1facf9fc | 17622 | + break; |
17623 | + err = 0; | |
17624 | + opt->type = token; | |
17625 | + break; | |
17626 | + case Opt_rdblk: | |
17627 | + if (unlikely(match_int(&a->args[0], &n) | |
1308ab2a | 17628 | + || n < 0 |
1facf9fc | 17629 | + || n > KMALLOC_MAX_SIZE)) { |
4a4d8108 | 17630 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 17631 | + break; |
17632 | + } | |
1308ab2a | 17633 | + if (unlikely(n && n < NAME_MAX)) { |
4a4d8108 AM |
17634 | + pr_err("rdblk must be larger than %d\n", |
17635 | + NAME_MAX); | |
1facf9fc | 17636 | + break; |
17637 | + } | |
17638 | + opt->rdblk = n; | |
17639 | + err = 0; | |
17640 | + opt->type = token; | |
17641 | + break; | |
17642 | + case Opt_rdhash: | |
17643 | + if (unlikely(match_int(&a->args[0], &n) | |
1308ab2a | 17644 | + || n < 0 |
1facf9fc | 17645 | + || n * sizeof(struct hlist_head) |
17646 | + > KMALLOC_MAX_SIZE)) { | |
4a4d8108 | 17647 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 17648 | + break; |
17649 | + } | |
17650 | + opt->rdhash = n; | |
17651 | + err = 0; | |
17652 | + opt->type = token; | |
17653 | + break; | |
17654 | + | |
17655 | + case Opt_trunc_xino: | |
17656 | + case Opt_notrunc_xino: | |
17657 | + case Opt_noxino: | |
17658 | + case Opt_trunc_xib: | |
17659 | + case Opt_notrunc_xib: | |
dece6358 AM |
17660 | + case Opt_shwh: |
17661 | + case Opt_noshwh: | |
1facf9fc | 17662 | + case Opt_plink: |
17663 | + case Opt_noplink: | |
17664 | + case Opt_list_plink: | |
4a4d8108 AM |
17665 | + case Opt_dio: |
17666 | + case Opt_nodio: | |
1facf9fc | 17667 | + case Opt_diropq_a: |
17668 | + case Opt_diropq_w: | |
17669 | + case Opt_warn_perm: | |
17670 | + case Opt_nowarn_perm: | |
17671 | + case Opt_refrof: | |
17672 | + case Opt_norefrof: | |
17673 | + case Opt_verbose: | |
17674 | + case Opt_noverbose: | |
17675 | + case Opt_sum: | |
17676 | + case Opt_nosum: | |
17677 | + case Opt_wsum: | |
dece6358 AM |
17678 | + case Opt_rdblk_def: |
17679 | + case Opt_rdhash_def: | |
1facf9fc | 17680 | + err = 0; |
17681 | + opt->type = token; | |
17682 | + break; | |
17683 | + | |
17684 | + case Opt_udba: | |
17685 | + opt->udba = udba_val(a->args[0].from); | |
17686 | + if (opt->udba >= 0) { | |
17687 | + err = 0; | |
17688 | + opt->type = token; | |
17689 | + } else | |
4a4d8108 | 17690 | + pr_err("wrong value, %s\n", opt_str); |
1facf9fc | 17691 | + break; |
17692 | + | |
17693 | + case Opt_wbr_create: | |
17694 | + u.create = &opt->wbr_create; | |
17695 | + u.create->wbr_create | |
17696 | + = au_wbr_create_val(a->args[0].from, u.create); | |
17697 | + if (u.create->wbr_create >= 0) { | |
17698 | + err = 0; | |
17699 | + opt->type = token; | |
17700 | + } else | |
4a4d8108 | 17701 | + pr_err("wrong value, %s\n", opt_str); |
1facf9fc | 17702 | + break; |
17703 | + case Opt_wbr_copyup: | |
17704 | + opt->wbr_copyup = au_wbr_copyup_val(a->args[0].from); | |
17705 | + if (opt->wbr_copyup >= 0) { | |
17706 | + err = 0; | |
17707 | + opt->type = token; | |
17708 | + } else | |
4a4d8108 | 17709 | + pr_err("wrong value, %s\n", opt_str); |
1facf9fc | 17710 | + break; |
17711 | + | |
17712 | + case Opt_ignore: | |
4a4d8108 | 17713 | + pr_warning("ignored %s\n", opt_str); |
1facf9fc | 17714 | + /*FALLTHROUGH*/ |
17715 | + case Opt_ignore_silent: | |
17716 | + skipped = 1; | |
17717 | + err = 0; | |
17718 | + break; | |
17719 | + case Opt_err: | |
4a4d8108 | 17720 | + pr_err("unknown option %s\n", opt_str); |
1facf9fc | 17721 | + break; |
17722 | + } | |
17723 | + | |
17724 | + if (!err && !skipped) { | |
17725 | + if (unlikely(++opt > opt_tail)) { | |
17726 | + err = -E2BIG; | |
17727 | + opt--; | |
17728 | + opt->type = Opt_tail; | |
17729 | + break; | |
17730 | + } | |
17731 | + opt->type = Opt_tail; | |
17732 | + } | |
17733 | + } | |
17734 | + | |
17735 | + kfree(a); | |
17736 | + dump_opts(opts); | |
17737 | + if (unlikely(err)) | |
17738 | + au_opts_free(opts); | |
17739 | + | |
4f0767ce | 17740 | +out: |
1facf9fc | 17741 | + return err; |
17742 | +} | |
17743 | + | |
17744 | +static int au_opt_wbr_create(struct super_block *sb, | |
17745 | + struct au_opt_wbr_create *create) | |
17746 | +{ | |
17747 | + int err; | |
17748 | + struct au_sbinfo *sbinfo; | |
17749 | + | |
dece6358 AM |
17750 | + SiMustWriteLock(sb); |
17751 | + | |
1facf9fc | 17752 | + err = 1; /* handled */ |
17753 | + sbinfo = au_sbi(sb); | |
17754 | + if (sbinfo->si_wbr_create_ops->fin) { | |
17755 | + err = sbinfo->si_wbr_create_ops->fin(sb); | |
17756 | + if (!err) | |
17757 | + err = 1; | |
17758 | + } | |
17759 | + | |
17760 | + sbinfo->si_wbr_create = create->wbr_create; | |
17761 | + sbinfo->si_wbr_create_ops = au_wbr_create_ops + create->wbr_create; | |
17762 | + switch (create->wbr_create) { | |
17763 | + case AuWbrCreate_MFSRRV: | |
17764 | + case AuWbrCreate_MFSRR: | |
17765 | + sbinfo->si_wbr_mfs.mfsrr_watermark = create->mfsrr_watermark; | |
17766 | + /*FALLTHROUGH*/ | |
17767 | + case AuWbrCreate_MFS: | |
17768 | + case AuWbrCreate_MFSV: | |
17769 | + case AuWbrCreate_PMFS: | |
17770 | + case AuWbrCreate_PMFSV: | |
953406b4 | 17771 | + sbinfo->si_wbr_mfs.mfs_expire = create->mfs_second * HZ; |
1facf9fc | 17772 | + break; |
17773 | + } | |
17774 | + | |
17775 | + if (sbinfo->si_wbr_create_ops->init) | |
17776 | + sbinfo->si_wbr_create_ops->init(sb); /* ignore */ | |
17777 | + | |
17778 | + return err; | |
17779 | +} | |
17780 | + | |
17781 | +/* | |
17782 | + * returns, | |
17783 | + * plus: processed without an error | |
17784 | + * zero: unprocessed | |
17785 | + */ | |
17786 | +static int au_opt_simple(struct super_block *sb, struct au_opt *opt, | |
17787 | + struct au_opts *opts) | |
17788 | +{ | |
17789 | + int err; | |
17790 | + struct au_sbinfo *sbinfo; | |
17791 | + | |
dece6358 AM |
17792 | + SiMustWriteLock(sb); |
17793 | + | |
1facf9fc | 17794 | + err = 1; /* handled */ |
17795 | + sbinfo = au_sbi(sb); | |
17796 | + switch (opt->type) { | |
17797 | + case Opt_udba: | |
17798 | + sbinfo->si_mntflags &= ~AuOptMask_UDBA; | |
17799 | + sbinfo->si_mntflags |= opt->udba; | |
17800 | + opts->given_udba |= opt->udba; | |
17801 | + break; | |
17802 | + | |
17803 | + case Opt_plink: | |
17804 | + au_opt_set(sbinfo->si_mntflags, PLINK); | |
17805 | + break; | |
17806 | + case Opt_noplink: | |
17807 | + if (au_opt_test(sbinfo->si_mntflags, PLINK)) | |
953406b4 | 17808 | + au_plink_put(sb); |
1facf9fc | 17809 | + au_opt_clr(sbinfo->si_mntflags, PLINK); |
17810 | + break; | |
17811 | + case Opt_list_plink: | |
17812 | + if (au_opt_test(sbinfo->si_mntflags, PLINK)) | |
17813 | + au_plink_list(sb); | |
17814 | + break; | |
17815 | + | |
4a4d8108 AM |
17816 | + case Opt_dio: |
17817 | + au_opt_set(sbinfo->si_mntflags, DIO); | |
17818 | + au_fset_opts(opts->flags, REFRESH_DYAOP); | |
17819 | + break; | |
17820 | + case Opt_nodio: | |
17821 | + au_opt_clr(sbinfo->si_mntflags, DIO); | |
17822 | + au_fset_opts(opts->flags, REFRESH_DYAOP); | |
17823 | + break; | |
17824 | + | |
1facf9fc | 17825 | + case Opt_diropq_a: |
17826 | + au_opt_set(sbinfo->si_mntflags, ALWAYS_DIROPQ); | |
17827 | + break; | |
17828 | + case Opt_diropq_w: | |
17829 | + au_opt_clr(sbinfo->si_mntflags, ALWAYS_DIROPQ); | |
17830 | + break; | |
17831 | + | |
17832 | + case Opt_warn_perm: | |
17833 | + au_opt_set(sbinfo->si_mntflags, WARN_PERM); | |
17834 | + break; | |
17835 | + case Opt_nowarn_perm: | |
17836 | + au_opt_clr(sbinfo->si_mntflags, WARN_PERM); | |
17837 | + break; | |
17838 | + | |
17839 | + case Opt_refrof: | |
17840 | + au_opt_set(sbinfo->si_mntflags, REFROF); | |
17841 | + break; | |
17842 | + case Opt_norefrof: | |
17843 | + au_opt_clr(sbinfo->si_mntflags, REFROF); | |
17844 | + break; | |
17845 | + | |
17846 | + case Opt_verbose: | |
17847 | + au_opt_set(sbinfo->si_mntflags, VERBOSE); | |
17848 | + break; | |
17849 | + case Opt_noverbose: | |
17850 | + au_opt_clr(sbinfo->si_mntflags, VERBOSE); | |
17851 | + break; | |
17852 | + | |
17853 | + case Opt_sum: | |
17854 | + au_opt_set(sbinfo->si_mntflags, SUM); | |
17855 | + break; | |
17856 | + case Opt_wsum: | |
17857 | + au_opt_clr(sbinfo->si_mntflags, SUM); | |
17858 | + au_opt_set(sbinfo->si_mntflags, SUM_W); | |
17859 | + case Opt_nosum: | |
17860 | + au_opt_clr(sbinfo->si_mntflags, SUM); | |
17861 | + au_opt_clr(sbinfo->si_mntflags, SUM_W); | |
17862 | + break; | |
17863 | + | |
17864 | + case Opt_wbr_create: | |
17865 | + err = au_opt_wbr_create(sb, &opt->wbr_create); | |
17866 | + break; | |
17867 | + case Opt_wbr_copyup: | |
17868 | + sbinfo->si_wbr_copyup = opt->wbr_copyup; | |
17869 | + sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + opt->wbr_copyup; | |
17870 | + break; | |
17871 | + | |
17872 | + case Opt_dirwh: | |
17873 | + sbinfo->si_dirwh = opt->dirwh; | |
17874 | + break; | |
17875 | + | |
17876 | + case Opt_rdcache: | |
953406b4 | 17877 | + sbinfo->si_rdcache = opt->rdcache * HZ; |
1facf9fc | 17878 | + break; |
17879 | + case Opt_rdblk: | |
17880 | + sbinfo->si_rdblk = opt->rdblk; | |
17881 | + break; | |
dece6358 AM |
17882 | + case Opt_rdblk_def: |
17883 | + sbinfo->si_rdblk = AUFS_RDBLK_DEF; | |
17884 | + break; | |
1facf9fc | 17885 | + case Opt_rdhash: |
17886 | + sbinfo->si_rdhash = opt->rdhash; | |
17887 | + break; | |
dece6358 AM |
17888 | + case Opt_rdhash_def: |
17889 | + sbinfo->si_rdhash = AUFS_RDHASH_DEF; | |
17890 | + break; | |
17891 | + | |
17892 | + case Opt_shwh: | |
17893 | + au_opt_set(sbinfo->si_mntflags, SHWH); | |
17894 | + break; | |
17895 | + case Opt_noshwh: | |
17896 | + au_opt_clr(sbinfo->si_mntflags, SHWH); | |
17897 | + break; | |
1facf9fc | 17898 | + |
17899 | + case Opt_trunc_xino: | |
17900 | + au_opt_set(sbinfo->si_mntflags, TRUNC_XINO); | |
17901 | + break; | |
17902 | + case Opt_notrunc_xino: | |
17903 | + au_opt_clr(sbinfo->si_mntflags, TRUNC_XINO); | |
17904 | + break; | |
17905 | + | |
17906 | + case Opt_trunc_xino_path: | |
17907 | + case Opt_itrunc_xino: | |
17908 | + err = au_xino_trunc(sb, opt->xino_itrunc.bindex); | |
17909 | + if (!err) | |
17910 | + err = 1; | |
17911 | + break; | |
17912 | + | |
17913 | + case Opt_trunc_xib: | |
17914 | + au_fset_opts(opts->flags, TRUNC_XIB); | |
17915 | + break; | |
17916 | + case Opt_notrunc_xib: | |
17917 | + au_fclr_opts(opts->flags, TRUNC_XIB); | |
17918 | + break; | |
17919 | + | |
17920 | + default: | |
17921 | + err = 0; | |
17922 | + break; | |
17923 | + } | |
17924 | + | |
17925 | + return err; | |
17926 | +} | |
17927 | + | |
17928 | +/* | |
17929 | + * returns tri-state. | |
17930 | + * plus: processed without an error | |
17931 | + * zero: unprocessed | |
17932 | + * minus: error | |
17933 | + */ | |
17934 | +static int au_opt_br(struct super_block *sb, struct au_opt *opt, | |
17935 | + struct au_opts *opts) | |
17936 | +{ | |
17937 | + int err, do_refresh; | |
17938 | + | |
17939 | + err = 0; | |
17940 | + switch (opt->type) { | |
17941 | + case Opt_append: | |
17942 | + opt->add.bindex = au_sbend(sb) + 1; | |
17943 | + if (opt->add.bindex < 0) | |
17944 | + opt->add.bindex = 0; | |
17945 | + goto add; | |
17946 | + case Opt_prepend: | |
17947 | + opt->add.bindex = 0; | |
17948 | + add: | |
17949 | + case Opt_add: | |
17950 | + err = au_br_add(sb, &opt->add, | |
17951 | + au_ftest_opts(opts->flags, REMOUNT)); | |
17952 | + if (!err) { | |
17953 | + err = 1; | |
17954 | + au_fset_opts(opts->flags, REFRESH_DIR); | |
4a4d8108 | 17955 | + au_fset_opts(opts->flags, REFRESH_NONDIR); |
1facf9fc | 17956 | + } |
17957 | + break; | |
17958 | + | |
17959 | + case Opt_del: | |
17960 | + case Opt_idel: | |
17961 | + err = au_br_del(sb, &opt->del, | |
17962 | + au_ftest_opts(opts->flags, REMOUNT)); | |
17963 | + if (!err) { | |
17964 | + err = 1; | |
17965 | + au_fset_opts(opts->flags, TRUNC_XIB); | |
17966 | + au_fset_opts(opts->flags, REFRESH_DIR); | |
17967 | + au_fset_opts(opts->flags, REFRESH_NONDIR); | |
17968 | + } | |
17969 | + break; | |
17970 | + | |
17971 | + case Opt_mod: | |
17972 | + case Opt_imod: | |
17973 | + err = au_br_mod(sb, &opt->mod, | |
17974 | + au_ftest_opts(opts->flags, REMOUNT), | |
17975 | + &do_refresh); | |
17976 | + if (!err) { | |
17977 | + err = 1; | |
17978 | + if (do_refresh) { | |
17979 | + au_fset_opts(opts->flags, REFRESH_DIR); | |
17980 | + au_fset_opts(opts->flags, REFRESH_NONDIR); | |
17981 | + } | |
17982 | + } | |
17983 | + break; | |
17984 | + } | |
17985 | + | |
17986 | + return err; | |
17987 | +} | |
17988 | + | |
17989 | +static int au_opt_xino(struct super_block *sb, struct au_opt *opt, | |
17990 | + struct au_opt_xino **opt_xino, | |
17991 | + struct au_opts *opts) | |
17992 | +{ | |
17993 | + int err; | |
17994 | + aufs_bindex_t bend, bindex; | |
17995 | + struct dentry *root, *parent, *h_root; | |
17996 | + | |
17997 | + err = 0; | |
17998 | + switch (opt->type) { | |
17999 | + case Opt_xino: | |
18000 | + err = au_xino_set(sb, &opt->xino, | |
18001 | + !!au_ftest_opts(opts->flags, REMOUNT)); | |
18002 | + if (unlikely(err)) | |
18003 | + break; | |
18004 | + | |
18005 | + *opt_xino = &opt->xino; | |
18006 | + au_xino_brid_set(sb, -1); | |
18007 | + | |
18008 | + /* safe d_parent access */ | |
18009 | + parent = opt->xino.file->f_dentry->d_parent; | |
18010 | + root = sb->s_root; | |
18011 | + bend = au_sbend(sb); | |
18012 | + for (bindex = 0; bindex <= bend; bindex++) { | |
18013 | + h_root = au_h_dptr(root, bindex); | |
18014 | + if (h_root == parent) { | |
18015 | + au_xino_brid_set(sb, au_sbr_id(sb, bindex)); | |
18016 | + break; | |
18017 | + } | |
18018 | + } | |
18019 | + break; | |
18020 | + | |
18021 | + case Opt_noxino: | |
18022 | + au_xino_clr(sb); | |
18023 | + au_xino_brid_set(sb, -1); | |
18024 | + *opt_xino = (void *)-1; | |
18025 | + break; | |
18026 | + } | |
18027 | + | |
18028 | + return err; | |
18029 | +} | |
18030 | + | |
18031 | +int au_opts_verify(struct super_block *sb, unsigned long sb_flags, | |
18032 | + unsigned int pending) | |
18033 | +{ | |
18034 | + int err; | |
18035 | + aufs_bindex_t bindex, bend; | |
18036 | + unsigned char do_plink, skip, do_free; | |
18037 | + struct au_branch *br; | |
18038 | + struct au_wbr *wbr; | |
18039 | + struct dentry *root; | |
18040 | + struct inode *dir, *h_dir; | |
18041 | + struct au_sbinfo *sbinfo; | |
18042 | + struct au_hinode *hdir; | |
18043 | + | |
dece6358 AM |
18044 | + SiMustAnyLock(sb); |
18045 | + | |
1facf9fc | 18046 | + sbinfo = au_sbi(sb); |
18047 | + AuDebugOn(!(sbinfo->si_mntflags & AuOptMask_UDBA)); | |
18048 | + | |
dece6358 AM |
18049 | + if (!(sb_flags & MS_RDONLY)) { |
18050 | + if (unlikely(!au_br_writable(au_sbr_perm(sb, 0)))) | |
4a4d8108 | 18051 | + pr_warning("first branch should be rw\n"); |
dece6358 | 18052 | + if (unlikely(au_opt_test(sbinfo->si_mntflags, SHWH))) |
4a4d8108 | 18053 | + pr_warning("shwh should be used with ro\n"); |
dece6358 | 18054 | + } |
1facf9fc | 18055 | + |
4a4d8108 | 18056 | + if (au_opt_test((sbinfo->si_mntflags | pending), UDBA_HNOTIFY) |
1facf9fc | 18057 | + && !au_opt_test(sbinfo->si_mntflags, XINO)) |
4a4d8108 | 18058 | + pr_warning("udba=*notify requires xino\n"); |
1facf9fc | 18059 | + |
18060 | + err = 0; | |
18061 | + root = sb->s_root; | |
4a4d8108 | 18062 | + dir = root->d_inode; |
1facf9fc | 18063 | + do_plink = !!au_opt_test(sbinfo->si_mntflags, PLINK); |
18064 | + bend = au_sbend(sb); | |
18065 | + for (bindex = 0; !err && bindex <= bend; bindex++) { | |
18066 | + skip = 0; | |
18067 | + h_dir = au_h_iptr(dir, bindex); | |
18068 | + br = au_sbr(sb, bindex); | |
18069 | + do_free = 0; | |
18070 | + | |
18071 | + wbr = br->br_wbr; | |
18072 | + if (wbr) | |
18073 | + wbr_wh_read_lock(wbr); | |
18074 | + | |
18075 | + switch (br->br_perm) { | |
18076 | + case AuBrPerm_RO: | |
18077 | + case AuBrPerm_ROWH: | |
18078 | + case AuBrPerm_RR: | |
18079 | + case AuBrPerm_RRWH: | |
18080 | + do_free = !!wbr; | |
18081 | + skip = (!wbr | |
18082 | + || (!wbr->wbr_whbase | |
18083 | + && !wbr->wbr_plink | |
18084 | + && !wbr->wbr_orph)); | |
18085 | + break; | |
18086 | + | |
18087 | + case AuBrPerm_RWNoLinkWH: | |
18088 | + /* skip = (!br->br_whbase && !br->br_orph); */ | |
18089 | + skip = (!wbr || !wbr->wbr_whbase); | |
18090 | + if (skip && wbr) { | |
18091 | + if (do_plink) | |
18092 | + skip = !!wbr->wbr_plink; | |
18093 | + else | |
18094 | + skip = !wbr->wbr_plink; | |
18095 | + } | |
18096 | + break; | |
18097 | + | |
18098 | + case AuBrPerm_RW: | |
18099 | + /* skip = (br->br_whbase && br->br_ohph); */ | |
18100 | + skip = (wbr && wbr->wbr_whbase); | |
18101 | + if (skip) { | |
18102 | + if (do_plink) | |
18103 | + skip = !!wbr->wbr_plink; | |
18104 | + else | |
18105 | + skip = !wbr->wbr_plink; | |
18106 | + } | |
18107 | + break; | |
18108 | + | |
18109 | + default: | |
18110 | + BUG(); | |
18111 | + } | |
18112 | + if (wbr) | |
18113 | + wbr_wh_read_unlock(wbr); | |
18114 | + | |
18115 | + if (skip) | |
18116 | + continue; | |
18117 | + | |
18118 | + hdir = au_hi(dir, bindex); | |
4a4d8108 | 18119 | + au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT); |
1facf9fc | 18120 | + if (wbr) |
18121 | + wbr_wh_write_lock(wbr); | |
18122 | + err = au_wh_init(au_h_dptr(root, bindex), br, sb); | |
18123 | + if (wbr) | |
18124 | + wbr_wh_write_unlock(wbr); | |
4a4d8108 | 18125 | + au_hn_imtx_unlock(hdir); |
1facf9fc | 18126 | + |
18127 | + if (!err && do_free) { | |
18128 | + kfree(wbr); | |
18129 | + br->br_wbr = NULL; | |
18130 | + } | |
18131 | + } | |
18132 | + | |
18133 | + return err; | |
18134 | +} | |
18135 | + | |
18136 | +int au_opts_mount(struct super_block *sb, struct au_opts *opts) | |
18137 | +{ | |
18138 | + int err; | |
18139 | + unsigned int tmp; | |
18140 | + aufs_bindex_t bend; | |
18141 | + struct au_opt *opt; | |
18142 | + struct au_opt_xino *opt_xino, xino; | |
18143 | + struct au_sbinfo *sbinfo; | |
18144 | + | |
dece6358 AM |
18145 | + SiMustWriteLock(sb); |
18146 | + | |
1facf9fc | 18147 | + err = 0; |
18148 | + opt_xino = NULL; | |
18149 | + opt = opts->opt; | |
18150 | + while (err >= 0 && opt->type != Opt_tail) | |
18151 | + err = au_opt_simple(sb, opt++, opts); | |
18152 | + if (err > 0) | |
18153 | + err = 0; | |
18154 | + else if (unlikely(err < 0)) | |
18155 | + goto out; | |
18156 | + | |
18157 | + /* disable xino and udba temporary */ | |
18158 | + sbinfo = au_sbi(sb); | |
18159 | + tmp = sbinfo->si_mntflags; | |
18160 | + au_opt_clr(sbinfo->si_mntflags, XINO); | |
18161 | + au_opt_set_udba(sbinfo->si_mntflags, UDBA_REVAL); | |
18162 | + | |
18163 | + opt = opts->opt; | |
18164 | + while (err >= 0 && opt->type != Opt_tail) | |
18165 | + err = au_opt_br(sb, opt++, opts); | |
18166 | + if (err > 0) | |
18167 | + err = 0; | |
18168 | + else if (unlikely(err < 0)) | |
18169 | + goto out; | |
18170 | + | |
18171 | + bend = au_sbend(sb); | |
18172 | + if (unlikely(bend < 0)) { | |
18173 | + err = -EINVAL; | |
4a4d8108 | 18174 | + pr_err("no branches\n"); |
1facf9fc | 18175 | + goto out; |
18176 | + } | |
18177 | + | |
18178 | + if (au_opt_test(tmp, XINO)) | |
18179 | + au_opt_set(sbinfo->si_mntflags, XINO); | |
18180 | + opt = opts->opt; | |
18181 | + while (!err && opt->type != Opt_tail) | |
18182 | + err = au_opt_xino(sb, opt++, &opt_xino, opts); | |
18183 | + if (unlikely(err)) | |
18184 | + goto out; | |
18185 | + | |
18186 | + err = au_opts_verify(sb, sb->s_flags, tmp); | |
18187 | + if (unlikely(err)) | |
18188 | + goto out; | |
18189 | + | |
18190 | + /* restore xino */ | |
18191 | + if (au_opt_test(tmp, XINO) && !opt_xino) { | |
18192 | + xino.file = au_xino_def(sb); | |
18193 | + err = PTR_ERR(xino.file); | |
18194 | + if (IS_ERR(xino.file)) | |
18195 | + goto out; | |
18196 | + | |
18197 | + err = au_xino_set(sb, &xino, /*remount*/0); | |
18198 | + fput(xino.file); | |
18199 | + if (unlikely(err)) | |
18200 | + goto out; | |
18201 | + } | |
18202 | + | |
18203 | + /* restore udba */ | |
18204 | + sbinfo->si_mntflags &= ~AuOptMask_UDBA; | |
18205 | + sbinfo->si_mntflags |= (tmp & AuOptMask_UDBA); | |
4a4d8108 | 18206 | + if (au_opt_test(tmp, UDBA_HNOTIFY)) { |
1facf9fc | 18207 | + struct inode *dir = sb->s_root->d_inode; |
4a4d8108 | 18208 | + au_hn_reset(dir, au_hi_flags(dir, /*isdir*/1) & ~AuHi_XINO); |
1facf9fc | 18209 | + } |
18210 | + | |
4f0767ce | 18211 | +out: |
1facf9fc | 18212 | + return err; |
18213 | +} | |
18214 | + | |
18215 | +int au_opts_remount(struct super_block *sb, struct au_opts *opts) | |
18216 | +{ | |
18217 | + int err, rerr; | |
18218 | + struct inode *dir; | |
18219 | + struct au_opt_xino *opt_xino; | |
18220 | + struct au_opt *opt; | |
18221 | + struct au_sbinfo *sbinfo; | |
18222 | + | |
dece6358 AM |
18223 | + SiMustWriteLock(sb); |
18224 | + | |
1facf9fc | 18225 | + dir = sb->s_root->d_inode; |
18226 | + sbinfo = au_sbi(sb); | |
18227 | + err = 0; | |
18228 | + opt_xino = NULL; | |
18229 | + opt = opts->opt; | |
18230 | + while (err >= 0 && opt->type != Opt_tail) { | |
18231 | + err = au_opt_simple(sb, opt, opts); | |
18232 | + if (!err) | |
18233 | + err = au_opt_br(sb, opt, opts); | |
18234 | + if (!err) | |
18235 | + err = au_opt_xino(sb, opt, &opt_xino, opts); | |
18236 | + opt++; | |
18237 | + } | |
18238 | + if (err > 0) | |
18239 | + err = 0; | |
18240 | + AuTraceErr(err); | |
18241 | + /* go on even err */ | |
18242 | + | |
18243 | + rerr = au_opts_verify(sb, opts->sb_flags, /*pending*/0); | |
18244 | + if (unlikely(rerr && !err)) | |
18245 | + err = rerr; | |
18246 | + | |
18247 | + if (au_ftest_opts(opts->flags, TRUNC_XIB)) { | |
18248 | + rerr = au_xib_trunc(sb); | |
18249 | + if (unlikely(rerr && !err)) | |
18250 | + err = rerr; | |
18251 | + } | |
18252 | + | |
18253 | + /* will be handled by the caller */ | |
18254 | + if (!au_ftest_opts(opts->flags, REFRESH_DIR) | |
18255 | + && (opts->given_udba || au_opt_test(sbinfo->si_mntflags, XINO))) | |
18256 | + au_fset_opts(opts->flags, REFRESH_DIR); | |
18257 | + | |
18258 | + AuDbg("status 0x%x\n", opts->flags); | |
18259 | + return err; | |
18260 | +} | |
18261 | + | |
18262 | +/* ---------------------------------------------------------------------- */ | |
18263 | + | |
18264 | +unsigned int au_opt_udba(struct super_block *sb) | |
18265 | +{ | |
18266 | + return au_mntflags(sb) & AuOptMask_UDBA; | |
18267 | +} | |
b752ccd1 AM |
18268 | diff -urN /usr/share/empty/fs/aufs/opts.h linux/fs/aufs/opts.h |
18269 | --- /usr/share/empty/fs/aufs/opts.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
18270 | +++ linux/fs/aufs/opts.h 2010-10-21 09:52:43.093625591 +0200 |
18271 | @@ -0,0 +1,198 @@ | |
1facf9fc | 18272 | +/* |
4a4d8108 | 18273 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 18274 | + * |
18275 | + * This program, aufs is free software; you can redistribute it and/or modify | |
18276 | + * it under the terms of the GNU General Public License as published by | |
18277 | + * the Free Software Foundation; either version 2 of the License, or | |
18278 | + * (at your option) any later version. | |
dece6358 AM |
18279 | + * |
18280 | + * This program is distributed in the hope that it will be useful, | |
18281 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18282 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18283 | + * GNU General Public License for more details. | |
18284 | + * | |
18285 | + * You should have received a copy of the GNU General Public License | |
18286 | + * along with this program; if not, write to the Free Software | |
18287 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 18288 | + */ |
18289 | + | |
18290 | +/* | |
18291 | + * mount options/flags | |
18292 | + */ | |
18293 | + | |
18294 | +#ifndef __AUFS_OPTS_H__ | |
18295 | +#define __AUFS_OPTS_H__ | |
18296 | + | |
18297 | +#ifdef __KERNEL__ | |
18298 | + | |
dece6358 | 18299 | +#include <linux/path.h> |
1facf9fc | 18300 | +#include <linux/aufs_type.h> |
18301 | + | |
dece6358 AM |
18302 | +struct file; |
18303 | +struct super_block; | |
18304 | + | |
1facf9fc | 18305 | +/* ---------------------------------------------------------------------- */ |
18306 | + | |
18307 | +/* mount flags */ | |
18308 | +#define AuOpt_XINO 1 /* external inode number bitmap | |
18309 | + and translation table */ | |
18310 | +#define AuOpt_TRUNC_XINO (1 << 1) /* truncate xino files */ | |
18311 | +#define AuOpt_UDBA_NONE (1 << 2) /* users direct branch access */ | |
18312 | +#define AuOpt_UDBA_REVAL (1 << 3) | |
4a4d8108 | 18313 | +#define AuOpt_UDBA_HNOTIFY (1 << 4) |
dece6358 AM |
18314 | +#define AuOpt_SHWH (1 << 5) /* show whiteout */ |
18315 | +#define AuOpt_PLINK (1 << 6) /* pseudo-link */ | |
18316 | +#define AuOpt_DIRPERM1 (1 << 7) /* unimplemented */ | |
18317 | +#define AuOpt_REFROF (1 << 8) /* unimplemented */ | |
18318 | +#define AuOpt_ALWAYS_DIROPQ (1 << 9) /* policy to creating diropq */ | |
18319 | +#define AuOpt_SUM (1 << 10) /* summation for statfs(2) */ | |
18320 | +#define AuOpt_SUM_W (1 << 11) /* unimplemented */ | |
18321 | +#define AuOpt_WARN_PERM (1 << 12) /* warn when add-branch */ | |
18322 | +#define AuOpt_VERBOSE (1 << 13) /* busy inode when del-branch */ | |
4a4d8108 | 18323 | +#define AuOpt_DIO (1 << 14) /* direct io */ |
1facf9fc | 18324 | + |
4a4d8108 AM |
18325 | +#ifndef CONFIG_AUFS_HNOTIFY |
18326 | +#undef AuOpt_UDBA_HNOTIFY | |
18327 | +#define AuOpt_UDBA_HNOTIFY 0 | |
1facf9fc | 18328 | +#endif |
dece6358 AM |
18329 | +#ifndef CONFIG_AUFS_SHWH |
18330 | +#undef AuOpt_SHWH | |
18331 | +#define AuOpt_SHWH 0 | |
18332 | +#endif | |
1facf9fc | 18333 | + |
18334 | +#define AuOpt_Def (AuOpt_XINO \ | |
18335 | + | AuOpt_UDBA_REVAL \ | |
18336 | + | AuOpt_PLINK \ | |
18337 | + /* | AuOpt_DIRPERM1 */ \ | |
18338 | + | AuOpt_WARN_PERM) | |
18339 | +#define AuOptMask_UDBA (AuOpt_UDBA_NONE \ | |
18340 | + | AuOpt_UDBA_REVAL \ | |
4a4d8108 | 18341 | + | AuOpt_UDBA_HNOTIFY) |
1facf9fc | 18342 | + |
18343 | +#define au_opt_test(flags, name) (flags & AuOpt_##name) | |
18344 | +#define au_opt_set(flags, name) do { \ | |
18345 | + BUILD_BUG_ON(AuOpt_##name & AuOptMask_UDBA); \ | |
18346 | + ((flags) |= AuOpt_##name); \ | |
18347 | +} while (0) | |
18348 | +#define au_opt_set_udba(flags, name) do { \ | |
18349 | + (flags) &= ~AuOptMask_UDBA; \ | |
18350 | + ((flags) |= AuOpt_##name); \ | |
18351 | +} while (0) | |
18352 | +#define au_opt_clr(flags, name) { ((flags) &= ~AuOpt_##name); } | |
18353 | + | |
18354 | +/* ---------------------------------------------------------------------- */ | |
18355 | + | |
18356 | +/* policies to select one among multiple writable branches */ | |
18357 | +enum { | |
18358 | + AuWbrCreate_TDP, /* top down parent */ | |
18359 | + AuWbrCreate_RR, /* round robin */ | |
18360 | + AuWbrCreate_MFS, /* most free space */ | |
18361 | + AuWbrCreate_MFSV, /* mfs with seconds */ | |
18362 | + AuWbrCreate_MFSRR, /* mfs then rr */ | |
18363 | + AuWbrCreate_MFSRRV, /* mfs then rr with seconds */ | |
18364 | + AuWbrCreate_PMFS, /* parent and mfs */ | |
18365 | + AuWbrCreate_PMFSV, /* parent and mfs with seconds */ | |
18366 | + | |
18367 | + AuWbrCreate_Def = AuWbrCreate_TDP | |
18368 | +}; | |
18369 | + | |
18370 | +enum { | |
18371 | + AuWbrCopyup_TDP, /* top down parent */ | |
18372 | + AuWbrCopyup_BUP, /* bottom up parent */ | |
18373 | + AuWbrCopyup_BU, /* bottom up */ | |
18374 | + | |
18375 | + AuWbrCopyup_Def = AuWbrCopyup_TDP | |
18376 | +}; | |
18377 | + | |
18378 | +/* ---------------------------------------------------------------------- */ | |
18379 | + | |
18380 | +struct au_opt_add { | |
18381 | + aufs_bindex_t bindex; | |
18382 | + char *pathname; | |
18383 | + int perm; | |
18384 | + struct path path; | |
18385 | +}; | |
18386 | + | |
18387 | +struct au_opt_del { | |
18388 | + char *pathname; | |
18389 | + struct path h_path; | |
18390 | +}; | |
18391 | + | |
18392 | +struct au_opt_mod { | |
18393 | + char *path; | |
18394 | + int perm; | |
18395 | + struct dentry *h_root; | |
18396 | +}; | |
18397 | + | |
18398 | +struct au_opt_xino { | |
18399 | + char *path; | |
18400 | + struct file *file; | |
18401 | +}; | |
18402 | + | |
18403 | +struct au_opt_xino_itrunc { | |
18404 | + aufs_bindex_t bindex; | |
18405 | +}; | |
18406 | + | |
18407 | +struct au_opt_wbr_create { | |
18408 | + int wbr_create; | |
18409 | + int mfs_second; | |
18410 | + unsigned long long mfsrr_watermark; | |
18411 | +}; | |
18412 | + | |
18413 | +struct au_opt { | |
18414 | + int type; | |
18415 | + union { | |
18416 | + struct au_opt_xino xino; | |
18417 | + struct au_opt_xino_itrunc xino_itrunc; | |
18418 | + struct au_opt_add add; | |
18419 | + struct au_opt_del del; | |
18420 | + struct au_opt_mod mod; | |
18421 | + int dirwh; | |
18422 | + int rdcache; | |
18423 | + unsigned int rdblk; | |
18424 | + unsigned int rdhash; | |
18425 | + int udba; | |
18426 | + struct au_opt_wbr_create wbr_create; | |
18427 | + int wbr_copyup; | |
18428 | + }; | |
18429 | +}; | |
18430 | + | |
18431 | +/* opts flags */ | |
18432 | +#define AuOpts_REMOUNT 1 | |
18433 | +#define AuOpts_REFRESH_DIR (1 << 1) | |
18434 | +#define AuOpts_REFRESH_NONDIR (1 << 2) | |
18435 | +#define AuOpts_TRUNC_XIB (1 << 3) | |
4a4d8108 | 18436 | +#define AuOpts_REFRESH_DYAOP (1 << 4) |
1facf9fc | 18437 | +#define au_ftest_opts(flags, name) ((flags) & AuOpts_##name) |
18438 | +#define au_fset_opts(flags, name) { (flags) |= AuOpts_##name; } | |
18439 | +#define au_fclr_opts(flags, name) { (flags) &= ~AuOpts_##name; } | |
18440 | + | |
18441 | +struct au_opts { | |
18442 | + struct au_opt *opt; | |
18443 | + int max_opt; | |
18444 | + | |
18445 | + unsigned int given_udba; | |
18446 | + unsigned int flags; | |
18447 | + unsigned long sb_flags; | |
18448 | +}; | |
18449 | + | |
18450 | +/* ---------------------------------------------------------------------- */ | |
18451 | + | |
18452 | +const char *au_optstr_br_perm(int brperm); | |
18453 | +const char *au_optstr_udba(int udba); | |
18454 | +const char *au_optstr_wbr_copyup(int wbr_copyup); | |
18455 | +const char *au_optstr_wbr_create(int wbr_create); | |
18456 | + | |
18457 | +void au_opts_free(struct au_opts *opts); | |
18458 | +int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts); | |
18459 | +int au_opts_verify(struct super_block *sb, unsigned long sb_flags, | |
18460 | + unsigned int pending); | |
18461 | +int au_opts_mount(struct super_block *sb, struct au_opts *opts); | |
18462 | +int au_opts_remount(struct super_block *sb, struct au_opts *opts); | |
18463 | + | |
18464 | +unsigned int au_opt_udba(struct super_block *sb); | |
18465 | + | |
18466 | +/* ---------------------------------------------------------------------- */ | |
18467 | + | |
18468 | +#endif /* __KERNEL__ */ | |
18469 | +#endif /* __AUFS_OPTS_H__ */ | |
b752ccd1 AM |
18470 | diff -urN /usr/share/empty/fs/aufs/plink.c linux/fs/aufs/plink.c |
18471 | --- /usr/share/empty/fs/aufs/plink.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
18472 | +++ linux/fs/aufs/plink.c 2010-10-21 09:52:43.093625591 +0200 |
18473 | @@ -0,0 +1,451 @@ | |
1facf9fc | 18474 | +/* |
4a4d8108 | 18475 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 18476 | + * |
18477 | + * This program, aufs is free software; you can redistribute it and/or modify | |
18478 | + * it under the terms of the GNU General Public License as published by | |
18479 | + * the Free Software Foundation; either version 2 of the License, or | |
18480 | + * (at your option) any later version. | |
dece6358 AM |
18481 | + * |
18482 | + * This program is distributed in the hope that it will be useful, | |
18483 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18484 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18485 | + * GNU General Public License for more details. | |
18486 | + * | |
18487 | + * You should have received a copy of the GNU General Public License | |
18488 | + * along with this program; if not, write to the Free Software | |
18489 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 18490 | + */ |
18491 | + | |
18492 | +/* | |
18493 | + * pseudo-link | |
18494 | + */ | |
18495 | + | |
18496 | +#include "aufs.h" | |
18497 | + | |
18498 | +/* | |
18499 | + * during a user process maintains the pseudo-links, | |
18500 | + * prohibit adding a new plink and branch manipulation. | |
18501 | + */ | |
953406b4 | 18502 | +void au_plink_maint_block(struct super_block *sb) |
1facf9fc | 18503 | +{ |
953406b4 | 18504 | + struct au_sbinfo *sbi = au_sbi(sb); |
dece6358 AM |
18505 | + |
18506 | + SiMustAnyLock(sb); | |
18507 | + | |
953406b4 AM |
18508 | + /* gave up wake_up_bit() */ |
18509 | + wait_event(sbi->si_plink_wq, !sbi->si_plink_maint); | |
4a4d8108 AM |
18510 | +} |
18511 | + | |
953406b4 | 18512 | +void au_plink_maint_leave(struct file *file) |
4a4d8108 | 18513 | +{ |
953406b4 | 18514 | + struct au_sbinfo *sbinfo; |
4a4d8108 AM |
18515 | + int iam; |
18516 | + | |
953406b4 AM |
18517 | + AuDebugOn(atomic_long_read(&file->f_count)); |
18518 | + | |
18519 | + sbinfo = au_sbi(file->f_dentry->d_sb); | |
4a4d8108 | 18520 | + spin_lock(&sbinfo->si_plink_maint_lock); |
953406b4 | 18521 | + iam = (sbinfo->si_plink_maint == file); |
4a4d8108 | 18522 | + if (iam) |
953406b4 | 18523 | + sbinfo->si_plink_maint = NULL; |
4a4d8108 AM |
18524 | + spin_unlock(&sbinfo->si_plink_maint_lock); |
18525 | + if (iam) | |
18526 | + wake_up_all(&sbinfo->si_plink_wq); | |
18527 | +} | |
18528 | + | |
953406b4 | 18529 | +static int au_plink_maint_enter(struct file *file) |
4a4d8108 AM |
18530 | +{ |
18531 | + int err; | |
953406b4 | 18532 | + struct super_block *sb; |
4a4d8108 AM |
18533 | + struct au_sbinfo *sbinfo; |
18534 | + | |
18535 | + err = 0; | |
953406b4 | 18536 | + sb = file->f_dentry->d_sb; |
4a4d8108 AM |
18537 | + sbinfo = au_sbi(sb); |
18538 | + /* make sure i am the only one in this fs */ | |
953406b4 AM |
18539 | + si_write_lock(sb); |
18540 | + /* spin_lock(&sbinfo->si_plink_maint_lock); */ | |
18541 | + if (!sbinfo->si_plink_maint) | |
18542 | + sbinfo->si_plink_maint = file; | |
18543 | + else | |
18544 | + err = -EBUSY; | |
18545 | + /* spin_unlock(&sbinfo->si_plink_maint_lock); */ | |
4a4d8108 AM |
18546 | + si_write_unlock(sb); |
18547 | + | |
18548 | + return err; | |
1facf9fc | 18549 | +} |
18550 | + | |
18551 | +/* ---------------------------------------------------------------------- */ | |
18552 | + | |
18553 | +struct pseudo_link { | |
4a4d8108 AM |
18554 | + union { |
18555 | + struct list_head list; | |
18556 | + struct rcu_head rcu; | |
18557 | + }; | |
1facf9fc | 18558 | + struct inode *inode; |
18559 | +}; | |
18560 | + | |
18561 | +#ifdef CONFIG_AUFS_DEBUG | |
18562 | +void au_plink_list(struct super_block *sb) | |
18563 | +{ | |
18564 | + struct au_sbinfo *sbinfo; | |
18565 | + struct list_head *plink_list; | |
18566 | + struct pseudo_link *plink; | |
18567 | + | |
dece6358 AM |
18568 | + SiMustAnyLock(sb); |
18569 | + | |
1facf9fc | 18570 | + sbinfo = au_sbi(sb); |
18571 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
18572 | + | |
18573 | + plink_list = &sbinfo->si_plink.head; | |
4a4d8108 AM |
18574 | + rcu_read_lock(); |
18575 | + list_for_each_entry_rcu(plink, plink_list, list) | |
1facf9fc | 18576 | + AuDbg("%lu\n", plink->inode->i_ino); |
4a4d8108 | 18577 | + rcu_read_unlock(); |
1facf9fc | 18578 | +} |
18579 | +#endif | |
18580 | + | |
18581 | +/* is the inode pseudo-linked? */ | |
18582 | +int au_plink_test(struct inode *inode) | |
18583 | +{ | |
18584 | + int found; | |
18585 | + struct au_sbinfo *sbinfo; | |
18586 | + struct list_head *plink_list; | |
18587 | + struct pseudo_link *plink; | |
18588 | + | |
18589 | + sbinfo = au_sbi(inode->i_sb); | |
dece6358 | 18590 | + AuRwMustAnyLock(&sbinfo->si_rwsem); |
1facf9fc | 18591 | + AuDebugOn(!au_opt_test(au_mntflags(inode->i_sb), PLINK)); |
18592 | + | |
18593 | + found = 0; | |
18594 | + plink_list = &sbinfo->si_plink.head; | |
4a4d8108 AM |
18595 | + rcu_read_lock(); |
18596 | + list_for_each_entry_rcu(plink, plink_list, list) | |
1facf9fc | 18597 | + if (plink->inode == inode) { |
18598 | + found = 1; | |
18599 | + break; | |
18600 | + } | |
4a4d8108 | 18601 | + rcu_read_unlock(); |
1facf9fc | 18602 | + return found; |
18603 | +} | |
18604 | + | |
18605 | +/* ---------------------------------------------------------------------- */ | |
18606 | + | |
18607 | +/* | |
18608 | + * generate a name for plink. | |
18609 | + * the file will be stored under AUFS_WH_PLINKDIR. | |
18610 | + */ | |
18611 | +/* 20 is max digits length of ulong 64 */ | |
18612 | +#define PLINK_NAME_LEN ((20 + 1) * 2) | |
18613 | + | |
18614 | +static int plink_name(char *name, int len, struct inode *inode, | |
18615 | + aufs_bindex_t bindex) | |
18616 | +{ | |
18617 | + int rlen; | |
18618 | + struct inode *h_inode; | |
18619 | + | |
18620 | + h_inode = au_h_iptr(inode, bindex); | |
18621 | + rlen = snprintf(name, len, "%lu.%lu", inode->i_ino, h_inode->i_ino); | |
18622 | + return rlen; | |
18623 | +} | |
18624 | + | |
18625 | +/* lookup the plink-ed @inode under the branch at @bindex */ | |
18626 | +struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex) | |
18627 | +{ | |
18628 | + struct dentry *h_dentry, *h_parent; | |
18629 | + struct au_branch *br; | |
18630 | + struct inode *h_dir; | |
18631 | + char a[PLINK_NAME_LEN]; | |
18632 | + struct qstr tgtname = { | |
18633 | + .name = a | |
18634 | + }; | |
18635 | + | |
18636 | + br = au_sbr(inode->i_sb, bindex); | |
18637 | + h_parent = br->br_wbr->wbr_plink; | |
18638 | + h_dir = h_parent->d_inode; | |
18639 | + tgtname.len = plink_name(a, sizeof(a), inode, bindex); | |
18640 | + | |
18641 | + /* always superio. */ | |
18642 | + mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_CHILD2); | |
18643 | + h_dentry = au_sio_lkup_one(&tgtname, h_parent, br); | |
18644 | + mutex_unlock(&h_dir->i_mutex); | |
18645 | + return h_dentry; | |
18646 | +} | |
18647 | + | |
18648 | +/* create a pseudo-link */ | |
18649 | +static int do_whplink(struct qstr *tgt, struct dentry *h_parent, | |
18650 | + struct dentry *h_dentry, struct au_branch *br) | |
18651 | +{ | |
18652 | + int err; | |
18653 | + struct path h_path = { | |
18654 | + .mnt = br->br_mnt | |
18655 | + }; | |
18656 | + struct inode *h_dir; | |
18657 | + | |
18658 | + h_dir = h_parent->d_inode; | |
4f0767ce | 18659 | +again: |
1facf9fc | 18660 | + h_path.dentry = au_lkup_one(tgt, h_parent, br, /*nd*/NULL); |
18661 | + err = PTR_ERR(h_path.dentry); | |
18662 | + if (IS_ERR(h_path.dentry)) | |
18663 | + goto out; | |
18664 | + | |
18665 | + err = 0; | |
18666 | + /* wh.plink dir is not monitored */ | |
18667 | + if (h_path.dentry->d_inode | |
18668 | + && h_path.dentry->d_inode != h_dentry->d_inode) { | |
18669 | + err = vfsub_unlink(h_dir, &h_path, /*force*/0); | |
18670 | + dput(h_path.dentry); | |
18671 | + h_path.dentry = NULL; | |
18672 | + if (!err) | |
18673 | + goto again; | |
18674 | + } | |
18675 | + if (!err && !h_path.dentry->d_inode) | |
18676 | + err = vfsub_link(h_dentry, h_dir, &h_path); | |
18677 | + dput(h_path.dentry); | |
18678 | + | |
4f0767ce | 18679 | +out: |
1facf9fc | 18680 | + return err; |
18681 | +} | |
18682 | + | |
18683 | +struct do_whplink_args { | |
18684 | + int *errp; | |
18685 | + struct qstr *tgt; | |
18686 | + struct dentry *h_parent; | |
18687 | + struct dentry *h_dentry; | |
18688 | + struct au_branch *br; | |
18689 | +}; | |
18690 | + | |
18691 | +static void call_do_whplink(void *args) | |
18692 | +{ | |
18693 | + struct do_whplink_args *a = args; | |
18694 | + *a->errp = do_whplink(a->tgt, a->h_parent, a->h_dentry, a->br); | |
18695 | +} | |
18696 | + | |
18697 | +static int whplink(struct dentry *h_dentry, struct inode *inode, | |
18698 | + aufs_bindex_t bindex, struct au_branch *br) | |
18699 | +{ | |
18700 | + int err, wkq_err; | |
18701 | + struct au_wbr *wbr; | |
18702 | + struct dentry *h_parent; | |
18703 | + struct inode *h_dir; | |
18704 | + char a[PLINK_NAME_LEN]; | |
18705 | + struct qstr tgtname = { | |
18706 | + .name = a | |
18707 | + }; | |
18708 | + | |
18709 | + wbr = au_sbr(inode->i_sb, bindex)->br_wbr; | |
18710 | + h_parent = wbr->wbr_plink; | |
18711 | + h_dir = h_parent->d_inode; | |
18712 | + tgtname.len = plink_name(a, sizeof(a), inode, bindex); | |
18713 | + | |
18714 | + /* always superio. */ | |
18715 | + mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_CHILD2); | |
b752ccd1 | 18716 | + if (current_fsuid()) { |
1facf9fc | 18717 | + struct do_whplink_args args = { |
18718 | + .errp = &err, | |
18719 | + .tgt = &tgtname, | |
18720 | + .h_parent = h_parent, | |
18721 | + .h_dentry = h_dentry, | |
18722 | + .br = br | |
18723 | + }; | |
18724 | + wkq_err = au_wkq_wait(call_do_whplink, &args); | |
18725 | + if (unlikely(wkq_err)) | |
18726 | + err = wkq_err; | |
18727 | + } else | |
18728 | + err = do_whplink(&tgtname, h_parent, h_dentry, br); | |
18729 | + mutex_unlock(&h_dir->i_mutex); | |
18730 | + | |
18731 | + return err; | |
18732 | +} | |
18733 | + | |
18734 | +/* free a single plink */ | |
18735 | +static void do_put_plink(struct pseudo_link *plink, int do_del) | |
18736 | +{ | |
1facf9fc | 18737 | + if (do_del) |
18738 | + list_del(&plink->list); | |
4a4d8108 AM |
18739 | + iput(plink->inode); |
18740 | + kfree(plink); | |
18741 | +} | |
18742 | + | |
18743 | +static void do_put_plink_rcu(struct rcu_head *rcu) | |
18744 | +{ | |
18745 | + struct pseudo_link *plink; | |
18746 | + | |
18747 | + plink = container_of(rcu, struct pseudo_link, rcu); | |
18748 | + iput(plink->inode); | |
1facf9fc | 18749 | + kfree(plink); |
18750 | +} | |
18751 | + | |
18752 | +/* | |
18753 | + * create a new pseudo-link for @h_dentry on @bindex. | |
18754 | + * the linked inode is held in aufs @inode. | |
18755 | + */ | |
18756 | +void au_plink_append(struct inode *inode, aufs_bindex_t bindex, | |
18757 | + struct dentry *h_dentry) | |
18758 | +{ | |
18759 | + struct super_block *sb; | |
18760 | + struct au_sbinfo *sbinfo; | |
18761 | + struct list_head *plink_list; | |
4a4d8108 | 18762 | + struct pseudo_link *plink, *tmp; |
1facf9fc | 18763 | + int found, err, cnt; |
18764 | + | |
18765 | + sb = inode->i_sb; | |
18766 | + sbinfo = au_sbi(sb); | |
18767 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
18768 | + | |
1facf9fc | 18769 | + cnt = 0; |
18770 | + found = 0; | |
18771 | + plink_list = &sbinfo->si_plink.head; | |
4a4d8108 AM |
18772 | + rcu_read_lock(); |
18773 | + list_for_each_entry_rcu(plink, plink_list, list) { | |
1facf9fc | 18774 | + cnt++; |
18775 | + if (plink->inode == inode) { | |
18776 | + found = 1; | |
18777 | + break; | |
18778 | + } | |
18779 | + } | |
4a4d8108 AM |
18780 | + rcu_read_unlock(); |
18781 | + if (found) | |
1facf9fc | 18782 | + return; |
4a4d8108 AM |
18783 | + |
18784 | + tmp = kmalloc(sizeof(*plink), GFP_NOFS); | |
18785 | + if (tmp) | |
18786 | + tmp->inode = au_igrab(inode); | |
18787 | + else { | |
18788 | + err = -ENOMEM; | |
18789 | + goto out; | |
1facf9fc | 18790 | + } |
18791 | + | |
4a4d8108 AM |
18792 | + spin_lock(&sbinfo->si_plink.spin); |
18793 | + list_for_each_entry(plink, plink_list, list) { | |
18794 | + if (plink->inode == inode) { | |
18795 | + found = 1; | |
18796 | + break; | |
18797 | + } | |
1facf9fc | 18798 | + } |
4a4d8108 AM |
18799 | + if (!found) |
18800 | + list_add_rcu(&tmp->list, plink_list); | |
1facf9fc | 18801 | + spin_unlock(&sbinfo->si_plink.spin); |
4a4d8108 AM |
18802 | + if (!found) { |
18803 | + cnt++; | |
18804 | + WARN_ONCE(cnt > AUFS_PLINK_WARN, | |
18805 | + "unexpectedly many pseudo links, %d\n", cnt); | |
953406b4 | 18806 | + au_plink_maint_block(sb); |
1facf9fc | 18807 | + err = whplink(h_dentry, inode, bindex, au_sbr(sb, bindex)); |
4a4d8108 AM |
18808 | + } else { |
18809 | + do_put_plink(tmp, 0); | |
18810 | + return; | |
1facf9fc | 18811 | + } |
18812 | + | |
4a4d8108 | 18813 | +out: |
1facf9fc | 18814 | + if (unlikely(err)) { |
4a4d8108 AM |
18815 | + pr_warning("err %d, damaged pseudo link.\n", err); |
18816 | + if (tmp) { | |
18817 | + au_spl_del_rcu(&tmp->list, &sbinfo->si_plink); | |
18818 | + call_rcu(&tmp->rcu, do_put_plink_rcu); | |
18819 | + } | |
1facf9fc | 18820 | + } |
18821 | +} | |
18822 | + | |
18823 | +/* free all plinks */ | |
953406b4 | 18824 | +void au_plink_put(struct super_block *sb) |
1facf9fc | 18825 | +{ |
18826 | + struct au_sbinfo *sbinfo; | |
18827 | + struct list_head *plink_list; | |
18828 | + struct pseudo_link *plink, *tmp; | |
18829 | + | |
dece6358 AM |
18830 | + SiMustWriteLock(sb); |
18831 | + | |
1facf9fc | 18832 | + sbinfo = au_sbi(sb); |
18833 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
18834 | + | |
18835 | + plink_list = &sbinfo->si_plink.head; | |
18836 | + /* no spin_lock since sbinfo is write-locked */ | |
18837 | + list_for_each_entry_safe(plink, tmp, plink_list, list) | |
18838 | + do_put_plink(plink, 0); | |
18839 | + INIT_LIST_HEAD(plink_list); | |
18840 | +} | |
18841 | + | |
18842 | +/* free the plinks on a branch specified by @br_id */ | |
18843 | +void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id) | |
18844 | +{ | |
18845 | + struct au_sbinfo *sbinfo; | |
18846 | + struct list_head *plink_list; | |
18847 | + struct pseudo_link *plink, *tmp; | |
18848 | + struct inode *inode; | |
18849 | + aufs_bindex_t bstart, bend, bindex; | |
18850 | + unsigned char do_put; | |
18851 | + | |
dece6358 AM |
18852 | + SiMustWriteLock(sb); |
18853 | + | |
1facf9fc | 18854 | + sbinfo = au_sbi(sb); |
18855 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
18856 | + | |
18857 | + plink_list = &sbinfo->si_plink.head; | |
18858 | + /* no spin_lock since sbinfo is write-locked */ | |
18859 | + list_for_each_entry_safe(plink, tmp, plink_list, list) { | |
18860 | + do_put = 0; | |
18861 | + inode = au_igrab(plink->inode); | |
18862 | + ii_write_lock_child(inode); | |
18863 | + bstart = au_ibstart(inode); | |
18864 | + bend = au_ibend(inode); | |
18865 | + if (bstart >= 0) { | |
18866 | + for (bindex = bstart; bindex <= bend; bindex++) { | |
18867 | + if (!au_h_iptr(inode, bindex) | |
18868 | + || au_ii_br_id(inode, bindex) != br_id) | |
18869 | + continue; | |
18870 | + au_set_h_iptr(inode, bindex, NULL, 0); | |
18871 | + do_put = 1; | |
18872 | + break; | |
18873 | + } | |
18874 | + } else | |
18875 | + do_put_plink(plink, 1); | |
18876 | + | |
dece6358 AM |
18877 | + if (do_put) { |
18878 | + for (bindex = bstart; bindex <= bend; bindex++) | |
18879 | + if (au_h_iptr(inode, bindex)) { | |
18880 | + do_put = 0; | |
18881 | + break; | |
18882 | + } | |
18883 | + if (do_put) | |
18884 | + do_put_plink(plink, 1); | |
18885 | + } | |
18886 | + ii_write_unlock(inode); | |
18887 | + iput(inode); | |
18888 | + } | |
18889 | +} | |
953406b4 AM |
18890 | + |
18891 | +/* ---------------------------------------------------------------------- */ | |
18892 | + | |
18893 | +long au_plink_ioctl(struct file *file, unsigned int cmd) | |
18894 | +{ | |
18895 | + long err; | |
18896 | + struct super_block *sb; | |
18897 | + | |
18898 | + err = -EACCES; | |
18899 | + if (!capable(CAP_SYS_ADMIN)) | |
18900 | + goto out; | |
18901 | + | |
18902 | + err = 0; | |
18903 | + sb = file->f_dentry->d_sb; | |
18904 | + switch (cmd) { | |
18905 | + case AUFS_CTL_PLINK_MAINT: | |
18906 | + /* | |
18907 | + * pseudo-link maintenance mode, | |
18908 | + * cleared by aufs_release_dir() | |
18909 | + */ | |
18910 | + err = au_plink_maint_enter(file); | |
18911 | + break; | |
18912 | + case AUFS_CTL_PLINK_CLEAN: | |
18913 | + aufs_write_lock(sb->s_root); | |
18914 | + if (au_opt_test(au_mntflags(sb), PLINK)) | |
18915 | + au_plink_put(sb); | |
18916 | + aufs_write_unlock(sb->s_root); | |
18917 | + break; | |
18918 | + default: | |
18919 | + /* err = -ENOTTY; */ | |
18920 | + err = -EINVAL; | |
18921 | + } | |
18922 | +out: | |
18923 | + return err; | |
18924 | +} | |
b752ccd1 AM |
18925 | diff -urN /usr/share/empty/fs/aufs/poll.c linux/fs/aufs/poll.c |
18926 | --- /usr/share/empty/fs/aufs/poll.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 18927 | +++ linux/fs/aufs/poll.c 2010-10-21 09:52:43.093625591 +0200 |
dece6358 AM |
18928 | @@ -0,0 +1,56 @@ |
18929 | +/* | |
4a4d8108 | 18930 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
dece6358 AM |
18931 | + * |
18932 | + * This program, aufs is free software; you can redistribute it and/or modify | |
18933 | + * it under the terms of the GNU General Public License as published by | |
18934 | + * the Free Software Foundation; either version 2 of the License, or | |
18935 | + * (at your option) any later version. | |
18936 | + * | |
18937 | + * This program is distributed in the hope that it will be useful, | |
18938 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18939 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18940 | + * GNU General Public License for more details. | |
18941 | + * | |
18942 | + * You should have received a copy of the GNU General Public License | |
18943 | + * along with this program; if not, write to the Free Software | |
18944 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18945 | + */ | |
18946 | + | |
1308ab2a | 18947 | +/* |
18948 | + * poll operation | |
18949 | + * There is only one filesystem which implements ->poll operation, currently. | |
18950 | + */ | |
18951 | + | |
18952 | +#include "aufs.h" | |
18953 | + | |
18954 | +unsigned int aufs_poll(struct file *file, poll_table *wait) | |
18955 | +{ | |
18956 | + unsigned int mask; | |
18957 | + int err; | |
18958 | + struct file *h_file; | |
18959 | + struct dentry *dentry; | |
18960 | + struct super_block *sb; | |
18961 | + | |
18962 | + /* We should pretend an error happened. */ | |
18963 | + mask = POLLERR /* | POLLIN | POLLOUT */; | |
18964 | + dentry = file->f_dentry; | |
18965 | + sb = dentry->d_sb; | |
953406b4 | 18966 | + si_read_lock(sb, AuLock_FLUSH); |
1308ab2a | 18967 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0); |
18968 | + if (unlikely(err)) | |
18969 | + goto out; | |
18970 | + | |
18971 | + /* it is not an error if h_file has no operation */ | |
18972 | + mask = DEFAULT_POLLMASK; | |
4a4d8108 | 18973 | + h_file = au_hf_top(file); |
1308ab2a | 18974 | + if (h_file->f_op && h_file->f_op->poll) |
18975 | + mask = h_file->f_op->poll(h_file, wait); | |
18976 | + | |
18977 | + di_read_unlock(dentry, AuLock_IR); | |
18978 | + fi_read_unlock(file); | |
18979 | + | |
4f0767ce | 18980 | +out: |
1308ab2a | 18981 | + si_read_unlock(sb); |
18982 | + AuTraceErr((int)mask); | |
18983 | + return mask; | |
18984 | +} | |
b752ccd1 AM |
18985 | diff -urN /usr/share/empty/fs/aufs/rdu.c linux/fs/aufs/rdu.c |
18986 | --- /usr/share/empty/fs/aufs/rdu.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
18987 | +++ linux/fs/aufs/rdu.c 2010-10-21 09:52:43.093625591 +0200 |
18988 | @@ -0,0 +1,377 @@ | |
1308ab2a | 18989 | +/* |
4a4d8108 | 18990 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1308ab2a | 18991 | + * |
18992 | + * This program, aufs is free software; you can redistribute it and/or modify | |
18993 | + * it under the terms of the GNU General Public License as published by | |
18994 | + * the Free Software Foundation; either version 2 of the License, or | |
18995 | + * (at your option) any later version. | |
18996 | + * | |
18997 | + * This program is distributed in the hope that it will be useful, | |
18998 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18999 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19000 | + * GNU General Public License for more details. | |
19001 | + * | |
19002 | + * You should have received a copy of the GNU General Public License | |
19003 | + * along with this program; if not, write to the Free Software | |
19004 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19005 | + */ | |
19006 | + | |
19007 | +/* | |
19008 | + * readdir in userspace. | |
19009 | + */ | |
19010 | + | |
b752ccd1 | 19011 | +#include <linux/compat.h> |
4a4d8108 | 19012 | +#include <linux/fs_stack.h> |
1308ab2a | 19013 | +#include <linux/security.h> |
19014 | +#include <linux/uaccess.h> | |
19015 | +#include <linux/aufs_type.h> | |
19016 | +#include "aufs.h" | |
19017 | + | |
19018 | +/* bits for struct aufs_rdu.flags */ | |
19019 | +#define AuRdu_CALLED 1 | |
19020 | +#define AuRdu_CONT (1 << 1) | |
19021 | +#define AuRdu_FULL (1 << 2) | |
19022 | +#define au_ftest_rdu(flags, name) ((flags) & AuRdu_##name) | |
19023 | +#define au_fset_rdu(flags, name) { (flags) |= AuRdu_##name; } | |
19024 | +#define au_fclr_rdu(flags, name) { (flags) &= ~AuRdu_##name; } | |
19025 | + | |
19026 | +struct au_rdu_arg { | |
19027 | + struct aufs_rdu *rdu; | |
19028 | + union au_rdu_ent_ul ent; | |
19029 | + unsigned long end; | |
19030 | + | |
19031 | + struct super_block *sb; | |
19032 | + int err; | |
19033 | +}; | |
19034 | + | |
19035 | +static int au_rdu_fill(void *__arg, const char *name, int nlen, | |
19036 | + loff_t offset, u64 h_ino, unsigned int d_type) | |
19037 | +{ | |
19038 | + int err, len; | |
19039 | + struct au_rdu_arg *arg = __arg; | |
19040 | + struct aufs_rdu *rdu = arg->rdu; | |
19041 | + struct au_rdu_ent ent; | |
19042 | + | |
19043 | + err = 0; | |
19044 | + arg->err = 0; | |
19045 | + au_fset_rdu(rdu->cookie.flags, CALLED); | |
19046 | + len = au_rdu_len(nlen); | |
19047 | + if (arg->ent.ul + len < arg->end) { | |
19048 | + ent.ino = h_ino; | |
19049 | + ent.bindex = rdu->cookie.bindex; | |
19050 | + ent.type = d_type; | |
19051 | + ent.nlen = nlen; | |
4a4d8108 AM |
19052 | + if (unlikely(nlen > AUFS_MAX_NAMELEN)) |
19053 | + ent.type = DT_UNKNOWN; | |
1308ab2a | 19054 | + |
19055 | + err = -EFAULT; | |
19056 | + if (copy_to_user(arg->ent.e, &ent, sizeof(ent))) | |
19057 | + goto out; | |
19058 | + if (copy_to_user(arg->ent.e->name, name, nlen)) | |
19059 | + goto out; | |
19060 | + /* the terminating NULL */ | |
19061 | + if (__put_user(0, arg->ent.e->name + nlen)) | |
19062 | + goto out; | |
19063 | + err = 0; | |
19064 | + /* AuDbg("%p, %.*s\n", arg->ent.p, nlen, name); */ | |
19065 | + arg->ent.ul += len; | |
19066 | + rdu->rent++; | |
19067 | + } else { | |
19068 | + err = -EFAULT; | |
19069 | + au_fset_rdu(rdu->cookie.flags, FULL); | |
19070 | + rdu->full = 1; | |
19071 | + rdu->tail = arg->ent; | |
19072 | + } | |
19073 | + | |
4f0767ce | 19074 | +out: |
1308ab2a | 19075 | + /* AuTraceErr(err); */ |
19076 | + return err; | |
19077 | +} | |
19078 | + | |
19079 | +static int au_rdu_do(struct file *h_file, struct au_rdu_arg *arg) | |
19080 | +{ | |
19081 | + int err; | |
19082 | + loff_t offset; | |
19083 | + struct au_rdu_cookie *cookie = &arg->rdu->cookie; | |
19084 | + | |
19085 | + offset = vfsub_llseek(h_file, cookie->h_pos, SEEK_SET); | |
19086 | + err = offset; | |
19087 | + if (unlikely(offset != cookie->h_pos)) | |
19088 | + goto out; | |
19089 | + | |
19090 | + err = 0; | |
19091 | + do { | |
19092 | + arg->err = 0; | |
19093 | + au_fclr_rdu(cookie->flags, CALLED); | |
19094 | + /* smp_mb(); */ | |
19095 | + err = vfsub_readdir(h_file, au_rdu_fill, arg); | |
19096 | + if (err >= 0) | |
19097 | + err = arg->err; | |
19098 | + } while (!err | |
19099 | + && au_ftest_rdu(cookie->flags, CALLED) | |
19100 | + && !au_ftest_rdu(cookie->flags, FULL)); | |
19101 | + cookie->h_pos = h_file->f_pos; | |
19102 | + | |
4f0767ce | 19103 | +out: |
1308ab2a | 19104 | + AuTraceErr(err); |
19105 | + return err; | |
19106 | +} | |
19107 | + | |
19108 | +static int au_rdu(struct file *file, struct aufs_rdu *rdu) | |
19109 | +{ | |
19110 | + int err; | |
19111 | + aufs_bindex_t bend; | |
19112 | + struct au_rdu_arg arg; | |
19113 | + struct dentry *dentry; | |
19114 | + struct inode *inode; | |
19115 | + struct file *h_file; | |
19116 | + struct au_rdu_cookie *cookie = &rdu->cookie; | |
19117 | + | |
19118 | + err = !access_ok(VERIFY_WRITE, rdu->ent.e, rdu->sz); | |
19119 | + if (unlikely(err)) { | |
19120 | + err = -EFAULT; | |
19121 | + AuTraceErr(err); | |
19122 | + goto out; | |
19123 | + } | |
19124 | + rdu->rent = 0; | |
19125 | + rdu->tail = rdu->ent; | |
19126 | + rdu->full = 0; | |
19127 | + arg.rdu = rdu; | |
19128 | + arg.ent = rdu->ent; | |
19129 | + arg.end = arg.ent.ul; | |
19130 | + arg.end += rdu->sz; | |
19131 | + | |
19132 | + err = -ENOTDIR; | |
19133 | + if (unlikely(!file->f_op || !file->f_op->readdir)) | |
19134 | + goto out; | |
19135 | + | |
19136 | + err = security_file_permission(file, MAY_READ); | |
19137 | + AuTraceErr(err); | |
19138 | + if (unlikely(err)) | |
19139 | + goto out; | |
19140 | + | |
19141 | + dentry = file->f_dentry; | |
19142 | + inode = dentry->d_inode; | |
19143 | +#if 1 | |
19144 | + mutex_lock(&inode->i_mutex); | |
19145 | +#else | |
19146 | + err = mutex_lock_killable(&inode->i_mutex); | |
19147 | + AuTraceErr(err); | |
19148 | + if (unlikely(err)) | |
19149 | + goto out; | |
19150 | +#endif | |
19151 | + err = -ENOENT; | |
19152 | + if (unlikely(IS_DEADDIR(inode))) | |
19153 | + goto out_mtx; | |
19154 | + | |
19155 | + arg.sb = inode->i_sb; | |
953406b4 | 19156 | + si_read_lock(arg.sb, AuLock_FLUSH); |
1308ab2a | 19157 | + fi_read_lock(file); |
19158 | + | |
19159 | + err = -EAGAIN; | |
19160 | + if (unlikely(au_ftest_rdu(cookie->flags, CONT) | |
19161 | + && cookie->generation != au_figen(file))) | |
19162 | + goto out_unlock; | |
19163 | + | |
19164 | + err = 0; | |
19165 | + if (!rdu->blk) { | |
19166 | + rdu->blk = au_sbi(arg.sb)->si_rdblk; | |
19167 | + if (!rdu->blk) | |
19168 | + rdu->blk = au_dir_size(file, /*dentry*/NULL); | |
19169 | + } | |
19170 | + bend = au_fbstart(file); | |
19171 | + if (cookie->bindex < bend) | |
19172 | + cookie->bindex = bend; | |
4a4d8108 | 19173 | + bend = au_fbend_dir(file); |
1308ab2a | 19174 | + /* AuDbg("b%d, b%d\n", cookie->bindex, bend); */ |
19175 | + for (; !err && cookie->bindex <= bend; | |
19176 | + cookie->bindex++, cookie->h_pos = 0) { | |
4a4d8108 | 19177 | + h_file = au_hf_dir(file, cookie->bindex); |
1308ab2a | 19178 | + if (!h_file) |
19179 | + continue; | |
19180 | + | |
19181 | + au_fclr_rdu(cookie->flags, FULL); | |
19182 | + err = au_rdu_do(h_file, &arg); | |
19183 | + AuTraceErr(err); | |
19184 | + if (unlikely(au_ftest_rdu(cookie->flags, FULL) || err)) | |
19185 | + break; | |
19186 | + } | |
19187 | + AuDbg("rent %llu\n", rdu->rent); | |
19188 | + | |
19189 | + if (!err && !au_ftest_rdu(cookie->flags, CONT)) { | |
19190 | + rdu->shwh = !!au_opt_test(au_sbi(arg.sb)->si_mntflags, SHWH); | |
19191 | + au_fset_rdu(cookie->flags, CONT); | |
19192 | + cookie->generation = au_figen(file); | |
19193 | + } | |
19194 | + | |
19195 | + ii_read_lock_child(inode); | |
19196 | + fsstack_copy_attr_atime(inode, au_h_iptr(inode, au_ibstart(inode))); | |
19197 | + ii_read_unlock(inode); | |
19198 | + | |
4f0767ce | 19199 | +out_unlock: |
1308ab2a | 19200 | + fi_read_unlock(file); |
19201 | + si_read_unlock(arg.sb); | |
4f0767ce | 19202 | +out_mtx: |
1308ab2a | 19203 | + mutex_unlock(&inode->i_mutex); |
4f0767ce | 19204 | +out: |
1308ab2a | 19205 | + AuTraceErr(err); |
19206 | + return err; | |
19207 | +} | |
19208 | + | |
19209 | +static int au_rdu_ino(struct file *file, struct aufs_rdu *rdu) | |
19210 | +{ | |
19211 | + int err; | |
19212 | + ino_t ino; | |
19213 | + unsigned long long nent; | |
19214 | + union au_rdu_ent_ul *u; | |
19215 | + struct au_rdu_ent ent; | |
19216 | + struct super_block *sb; | |
19217 | + | |
19218 | + err = 0; | |
19219 | + nent = rdu->nent; | |
19220 | + u = &rdu->ent; | |
19221 | + sb = file->f_dentry->d_sb; | |
19222 | + si_read_lock(sb, AuLock_FLUSH); | |
19223 | + while (nent-- > 0) { | |
1308ab2a | 19224 | + err = copy_from_user(&ent, u->e, sizeof(ent)); |
4a4d8108 AM |
19225 | + if (!err) |
19226 | + err = !access_ok(VERIFY_WRITE, &u->e->ino, sizeof(ino)); | |
1308ab2a | 19227 | + if (unlikely(err)) { |
19228 | + err = -EFAULT; | |
19229 | + AuTraceErr(err); | |
19230 | + break; | |
19231 | + } | |
19232 | + | |
19233 | + /* AuDbg("b%d, i%llu\n", ent.bindex, ent.ino); */ | |
19234 | + if (!ent.wh) | |
19235 | + err = au_ino(sb, ent.bindex, ent.ino, ent.type, &ino); | |
19236 | + else | |
19237 | + err = au_wh_ino(sb, ent.bindex, ent.ino, ent.type, | |
19238 | + &ino); | |
19239 | + if (unlikely(err)) { | |
19240 | + AuTraceErr(err); | |
19241 | + break; | |
19242 | + } | |
19243 | + | |
19244 | + err = __put_user(ino, &u->e->ino); | |
19245 | + if (unlikely(err)) { | |
19246 | + err = -EFAULT; | |
19247 | + AuTraceErr(err); | |
19248 | + break; | |
19249 | + } | |
19250 | + u->ul += au_rdu_len(ent.nlen); | |
19251 | + } | |
19252 | + si_read_unlock(sb); | |
19253 | + | |
19254 | + return err; | |
19255 | +} | |
19256 | + | |
19257 | +/* ---------------------------------------------------------------------- */ | |
19258 | + | |
19259 | +static int au_rdu_verify(struct aufs_rdu *rdu) | |
19260 | +{ | |
b752ccd1 | 19261 | + AuDbg("rdu{%llu, %p, %u | %u | %llu, %u, %u | " |
1308ab2a | 19262 | + "%llu, b%d, 0x%x, g%u}\n", |
b752ccd1 | 19263 | + rdu->sz, rdu->ent.e, rdu->verify[AufsCtlRduV_SZ], |
1308ab2a | 19264 | + rdu->blk, |
19265 | + rdu->rent, rdu->shwh, rdu->full, | |
19266 | + rdu->cookie.h_pos, rdu->cookie.bindex, rdu->cookie.flags, | |
19267 | + rdu->cookie.generation); | |
dece6358 | 19268 | + |
b752ccd1 | 19269 | + if (rdu->verify[AufsCtlRduV_SZ] == sizeof(*rdu)) |
1308ab2a | 19270 | + return 0; |
dece6358 | 19271 | + |
b752ccd1 AM |
19272 | + AuDbg("%u:%u\n", |
19273 | + rdu->verify[AufsCtlRduV_SZ], (unsigned int)sizeof(*rdu)); | |
1308ab2a | 19274 | + return -EINVAL; |
19275 | +} | |
19276 | + | |
19277 | +long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
dece6358 | 19278 | +{ |
1308ab2a | 19279 | + long err, e; |
19280 | + struct aufs_rdu rdu; | |
19281 | + void __user *p = (void __user *)arg; | |
dece6358 | 19282 | + |
1308ab2a | 19283 | + err = copy_from_user(&rdu, p, sizeof(rdu)); |
19284 | + if (unlikely(err)) { | |
19285 | + err = -EFAULT; | |
19286 | + AuTraceErr(err); | |
19287 | + goto out; | |
19288 | + } | |
19289 | + err = au_rdu_verify(&rdu); | |
dece6358 AM |
19290 | + if (unlikely(err)) |
19291 | + goto out; | |
19292 | + | |
1308ab2a | 19293 | + switch (cmd) { |
19294 | + case AUFS_CTL_RDU: | |
19295 | + err = au_rdu(file, &rdu); | |
19296 | + if (unlikely(err)) | |
19297 | + break; | |
dece6358 | 19298 | + |
1308ab2a | 19299 | + e = copy_to_user(p, &rdu, sizeof(rdu)); |
19300 | + if (unlikely(e)) { | |
19301 | + err = -EFAULT; | |
19302 | + AuTraceErr(err); | |
19303 | + } | |
19304 | + break; | |
19305 | + case AUFS_CTL_RDU_INO: | |
19306 | + err = au_rdu_ino(file, &rdu); | |
19307 | + break; | |
19308 | + | |
19309 | + default: | |
4a4d8108 | 19310 | + /* err = -ENOTTY; */ |
1308ab2a | 19311 | + err = -EINVAL; |
19312 | + } | |
dece6358 | 19313 | + |
4f0767ce | 19314 | +out: |
1308ab2a | 19315 | + AuTraceErr(err); |
19316 | + return err; | |
1facf9fc | 19317 | +} |
b752ccd1 AM |
19318 | + |
19319 | +#ifdef CONFIG_COMPAT | |
19320 | +long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
19321 | +{ | |
19322 | + long err, e; | |
19323 | + struct aufs_rdu rdu; | |
19324 | + void __user *p = compat_ptr(arg); | |
19325 | + | |
19326 | + /* todo: get_user()? */ | |
19327 | + err = copy_from_user(&rdu, p, sizeof(rdu)); | |
19328 | + if (unlikely(err)) { | |
19329 | + err = -EFAULT; | |
19330 | + AuTraceErr(err); | |
19331 | + goto out; | |
19332 | + } | |
19333 | + rdu.ent.e = compat_ptr(rdu.ent.ul); | |
19334 | + err = au_rdu_verify(&rdu); | |
19335 | + if (unlikely(err)) | |
19336 | + goto out; | |
19337 | + | |
19338 | + switch (cmd) { | |
19339 | + case AUFS_CTL_RDU: | |
19340 | + err = au_rdu(file, &rdu); | |
19341 | + if (unlikely(err)) | |
19342 | + break; | |
19343 | + | |
19344 | + rdu.ent.ul = ptr_to_compat(rdu.ent.e); | |
19345 | + rdu.tail.ul = ptr_to_compat(rdu.tail.e); | |
19346 | + e = copy_to_user(p, &rdu, sizeof(rdu)); | |
19347 | + if (unlikely(e)) { | |
19348 | + err = -EFAULT; | |
19349 | + AuTraceErr(err); | |
19350 | + } | |
19351 | + break; | |
19352 | + case AUFS_CTL_RDU_INO: | |
19353 | + err = au_rdu_ino(file, &rdu); | |
19354 | + break; | |
19355 | + | |
19356 | + default: | |
19357 | + /* err = -ENOTTY; */ | |
19358 | + err = -EINVAL; | |
19359 | + } | |
19360 | + | |
4f0767ce | 19361 | +out: |
b752ccd1 AM |
19362 | + AuTraceErr(err); |
19363 | + return err; | |
19364 | +} | |
19365 | +#endif | |
19366 | diff -urN /usr/share/empty/fs/aufs/rwsem.h linux/fs/aufs/rwsem.h | |
19367 | --- /usr/share/empty/fs/aufs/rwsem.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
19368 | +++ linux/fs/aufs/rwsem.h 2010-10-21 09:52:43.093625591 +0200 |
19369 | @@ -0,0 +1,187 @@ | |
1facf9fc | 19370 | +/* |
4a4d8108 | 19371 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 19372 | + * |
19373 | + * This program, aufs is free software; you can redistribute it and/or modify | |
19374 | + * it under the terms of the GNU General Public License as published by | |
19375 | + * the Free Software Foundation; either version 2 of the License, or | |
19376 | + * (at your option) any later version. | |
dece6358 AM |
19377 | + * |
19378 | + * This program is distributed in the hope that it will be useful, | |
19379 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19380 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19381 | + * GNU General Public License for more details. | |
19382 | + * | |
19383 | + * You should have received a copy of the GNU General Public License | |
19384 | + * along with this program; if not, write to the Free Software | |
19385 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 19386 | + */ |
19387 | + | |
19388 | +/* | |
19389 | + * simple read-write semaphore wrappers | |
19390 | + */ | |
19391 | + | |
19392 | +#ifndef __AUFS_RWSEM_H__ | |
19393 | +#define __AUFS_RWSEM_H__ | |
19394 | + | |
19395 | +#ifdef __KERNEL__ | |
19396 | + | |
dece6358 | 19397 | +#include <linux/rwsem.h> |
4a4d8108 | 19398 | +#include "debug.h" |
dece6358 AM |
19399 | + |
19400 | +struct au_rwsem { | |
19401 | + struct rw_semaphore rwsem; | |
19402 | +#ifdef CONFIG_AUFS_DEBUG | |
19403 | + /* just for debugging, not almighty counter */ | |
19404 | + atomic_t rcnt, wcnt; | |
19405 | +#endif | |
19406 | +}; | |
19407 | + | |
19408 | +#ifdef CONFIG_AUFS_DEBUG | |
19409 | +#define AuDbgCntInit(rw) do { \ | |
19410 | + atomic_set(&(rw)->rcnt, 0); \ | |
19411 | + atomic_set(&(rw)->wcnt, 0); \ | |
19412 | + smp_mb(); /* atomic set */ \ | |
19413 | +} while (0) | |
19414 | + | |
953406b4 | 19415 | +#define AuDbgRcntInc(rw) atomic_inc_return(&(rw)->rcnt) |
dece6358 | 19416 | +#define AuDbgRcntDec(rw) WARN_ON(atomic_dec_return(&(rw)->rcnt) < 0) |
953406b4 | 19417 | +#define AuDbgWcntInc(rw) WARN_ON(atomic_inc_return(&(rw)->wcnt) > 1) |
dece6358 AM |
19418 | +#define AuDbgWcntDec(rw) WARN_ON(atomic_dec_return(&(rw)->wcnt) < 0) |
19419 | +#else | |
19420 | +#define AuDbgCntInit(rw) do {} while (0) | |
19421 | +#define AuDbgRcntInc(rw) do {} while (0) | |
19422 | +#define AuDbgRcntDec(rw) do {} while (0) | |
19423 | +#define AuDbgWcntInc(rw) do {} while (0) | |
19424 | +#define AuDbgWcntDec(rw) do {} while (0) | |
19425 | +#endif /* CONFIG_AUFS_DEBUG */ | |
19426 | + | |
19427 | +/* to debug easier, do not make them inlined functions */ | |
19428 | +#define AuRwMustNoWaiters(rw) AuDebugOn(!list_empty(&(rw)->rwsem.wait_list)) | |
19429 | +/* rwsem_is_locked() is unusable */ | |
19430 | +#define AuRwMustReadLock(rw) AuDebugOn(atomic_read(&(rw)->rcnt) <= 0) | |
19431 | +#define AuRwMustWriteLock(rw) AuDebugOn(atomic_read(&(rw)->wcnt) <= 0) | |
19432 | +#define AuRwMustAnyLock(rw) AuDebugOn(atomic_read(&(rw)->rcnt) <= 0 \ | |
19433 | + && atomic_read(&(rw)->wcnt) <= 0) | |
19434 | +#define AuRwDestroy(rw) AuDebugOn(atomic_read(&(rw)->rcnt) \ | |
19435 | + || atomic_read(&(rw)->wcnt)) | |
19436 | + | |
19437 | +static inline void au_rw_init(struct au_rwsem *rw) | |
19438 | +{ | |
19439 | + AuDbgCntInit(rw); | |
19440 | + init_rwsem(&rw->rwsem); | |
19441 | +} | |
19442 | + | |
19443 | +static inline void au_rw_init_wlock(struct au_rwsem *rw) | |
19444 | +{ | |
19445 | + au_rw_init(rw); | |
19446 | + down_write(&rw->rwsem); | |
19447 | + AuDbgWcntInc(rw); | |
19448 | +} | |
19449 | + | |
19450 | +static inline void au_rw_init_wlock_nested(struct au_rwsem *rw, | |
19451 | + unsigned int lsc) | |
19452 | +{ | |
19453 | + au_rw_init(rw); | |
19454 | + down_write_nested(&rw->rwsem, lsc); | |
19455 | + AuDbgWcntInc(rw); | |
19456 | +} | |
19457 | + | |
19458 | +static inline void au_rw_read_lock(struct au_rwsem *rw) | |
19459 | +{ | |
19460 | + down_read(&rw->rwsem); | |
19461 | + AuDbgRcntInc(rw); | |
19462 | +} | |
19463 | + | |
19464 | +static inline void au_rw_read_lock_nested(struct au_rwsem *rw, unsigned int lsc) | |
19465 | +{ | |
19466 | + down_read_nested(&rw->rwsem, lsc); | |
19467 | + AuDbgRcntInc(rw); | |
19468 | +} | |
19469 | + | |
19470 | +static inline void au_rw_read_unlock(struct au_rwsem *rw) | |
19471 | +{ | |
19472 | + AuRwMustReadLock(rw); | |
19473 | + AuDbgRcntDec(rw); | |
19474 | + up_read(&rw->rwsem); | |
19475 | +} | |
19476 | + | |
19477 | +static inline void au_rw_dgrade_lock(struct au_rwsem *rw) | |
19478 | +{ | |
19479 | + AuRwMustWriteLock(rw); | |
19480 | + AuDbgRcntInc(rw); | |
19481 | + AuDbgWcntDec(rw); | |
19482 | + downgrade_write(&rw->rwsem); | |
19483 | +} | |
19484 | + | |
19485 | +static inline void au_rw_write_lock(struct au_rwsem *rw) | |
19486 | +{ | |
19487 | + down_write(&rw->rwsem); | |
19488 | + AuDbgWcntInc(rw); | |
19489 | +} | |
19490 | + | |
19491 | +static inline void au_rw_write_lock_nested(struct au_rwsem *rw, | |
19492 | + unsigned int lsc) | |
19493 | +{ | |
19494 | + down_write_nested(&rw->rwsem, lsc); | |
19495 | + AuDbgWcntInc(rw); | |
19496 | +} | |
1facf9fc | 19497 | + |
dece6358 AM |
19498 | +static inline void au_rw_write_unlock(struct au_rwsem *rw) |
19499 | +{ | |
19500 | + AuRwMustWriteLock(rw); | |
19501 | + AuDbgWcntDec(rw); | |
19502 | + up_write(&rw->rwsem); | |
19503 | +} | |
19504 | + | |
19505 | +/* why is not _nested version defined */ | |
19506 | +static inline int au_rw_read_trylock(struct au_rwsem *rw) | |
19507 | +{ | |
19508 | + int ret = down_read_trylock(&rw->rwsem); | |
19509 | + if (ret) | |
19510 | + AuDbgRcntInc(rw); | |
19511 | + return ret; | |
19512 | +} | |
19513 | + | |
19514 | +static inline int au_rw_write_trylock(struct au_rwsem *rw) | |
19515 | +{ | |
19516 | + int ret = down_write_trylock(&rw->rwsem); | |
19517 | + if (ret) | |
19518 | + AuDbgWcntInc(rw); | |
19519 | + return ret; | |
19520 | +} | |
19521 | + | |
19522 | +#undef AuDbgCntInit | |
19523 | +#undef AuDbgRcntInc | |
19524 | +#undef AuDbgRcntDec | |
19525 | +#undef AuDbgWcntInc | |
19526 | +#undef AuDbgWcntDec | |
1facf9fc | 19527 | + |
19528 | +#define AuSimpleLockRwsemFuncs(prefix, param, rwsem) \ | |
19529 | +static inline void prefix##_read_lock(param) \ | |
dece6358 | 19530 | +{ au_rw_read_lock(rwsem); } \ |
1facf9fc | 19531 | +static inline void prefix##_write_lock(param) \ |
dece6358 | 19532 | +{ au_rw_write_lock(rwsem); } \ |
1facf9fc | 19533 | +static inline int prefix##_read_trylock(param) \ |
dece6358 | 19534 | +{ return au_rw_read_trylock(rwsem); } \ |
1facf9fc | 19535 | +static inline int prefix##_write_trylock(param) \ |
dece6358 | 19536 | +{ return au_rw_write_trylock(rwsem); } |
1facf9fc | 19537 | +/* why is not _nested version defined */ |
19538 | +/* static inline void prefix##_read_trylock_nested(param, lsc) | |
dece6358 | 19539 | +{ au_rw_read_trylock_nested(rwsem, lsc)); } |
1facf9fc | 19540 | +static inline void prefix##_write_trylock_nestd(param, lsc) |
dece6358 | 19541 | +{ au_rw_write_trylock_nested(rwsem, lsc); } */ |
1facf9fc | 19542 | + |
19543 | +#define AuSimpleUnlockRwsemFuncs(prefix, param, rwsem) \ | |
19544 | +static inline void prefix##_read_unlock(param) \ | |
dece6358 | 19545 | +{ au_rw_read_unlock(rwsem); } \ |
1facf9fc | 19546 | +static inline void prefix##_write_unlock(param) \ |
dece6358 | 19547 | +{ au_rw_write_unlock(rwsem); } \ |
1facf9fc | 19548 | +static inline void prefix##_downgrade_lock(param) \ |
dece6358 | 19549 | +{ au_rw_dgrade_lock(rwsem); } |
1facf9fc | 19550 | + |
19551 | +#define AuSimpleRwsemFuncs(prefix, param, rwsem) \ | |
19552 | + AuSimpleLockRwsemFuncs(prefix, param, rwsem) \ | |
19553 | + AuSimpleUnlockRwsemFuncs(prefix, param, rwsem) | |
19554 | + | |
19555 | +#endif /* __KERNEL__ */ | |
19556 | +#endif /* __AUFS_RWSEM_H__ */ | |
b752ccd1 AM |
19557 | diff -urN /usr/share/empty/fs/aufs/sbinfo.c linux/fs/aufs/sbinfo.c |
19558 | --- /usr/share/empty/fs/aufs/sbinfo.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
19559 | +++ linux/fs/aufs/sbinfo.c 2010-10-21 09:52:43.093625591 +0200 |
19560 | @@ -0,0 +1,269 @@ | |
1facf9fc | 19561 | +/* |
4a4d8108 | 19562 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 19563 | + * |
19564 | + * This program, aufs is free software; you can redistribute it and/or modify | |
19565 | + * it under the terms of the GNU General Public License as published by | |
19566 | + * the Free Software Foundation; either version 2 of the License, or | |
19567 | + * (at your option) any later version. | |
dece6358 AM |
19568 | + * |
19569 | + * This program is distributed in the hope that it will be useful, | |
19570 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19571 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19572 | + * GNU General Public License for more details. | |
19573 | + * | |
19574 | + * You should have received a copy of the GNU General Public License | |
19575 | + * along with this program; if not, write to the Free Software | |
19576 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 19577 | + */ |
19578 | + | |
19579 | +/* | |
19580 | + * superblock private data | |
19581 | + */ | |
19582 | + | |
19583 | +#include "aufs.h" | |
19584 | + | |
19585 | +/* | |
19586 | + * they are necessary regardless sysfs is disabled. | |
19587 | + */ | |
19588 | +void au_si_free(struct kobject *kobj) | |
19589 | +{ | |
19590 | + struct au_sbinfo *sbinfo; | |
953406b4 | 19591 | + struct super_block *sb; |
b752ccd1 | 19592 | + char *locked __maybe_unused; /* debug only */ |
1facf9fc | 19593 | + |
19594 | + sbinfo = container_of(kobj, struct au_sbinfo, si_kobj); | |
19595 | + AuDebugOn(!list_empty(&sbinfo->si_plink.head)); | |
953406b4 | 19596 | + AuDebugOn(sbinfo->si_plink_maint); |
1facf9fc | 19597 | + |
953406b4 AM |
19598 | + sb = sbinfo->si_sb; |
19599 | + si_write_lock(sb); | |
19600 | + au_xino_clr(sb); | |
1facf9fc | 19601 | + au_br_free(sbinfo); |
953406b4 | 19602 | + si_write_unlock(sb); |
b752ccd1 AM |
19603 | + |
19604 | + AuDebugOn(radix_tree_gang_lookup | |
19605 | + (&sbinfo->au_si_pid.tree, (void **)&locked, | |
19606 | + /*first_index*/PID_MAX_DEFAULT - 1, | |
19607 | + /*max_items*/sizeof(locked)/sizeof(*locked))); | |
19608 | + | |
1facf9fc | 19609 | + kfree(sbinfo->si_branch); |
b752ccd1 | 19610 | + kfree(sbinfo->au_si_pid.bitmap); |
1facf9fc | 19611 | + mutex_destroy(&sbinfo->si_xib_mtx); |
dece6358 | 19612 | + AuRwDestroy(&sbinfo->si_rwsem); |
1facf9fc | 19613 | + |
19614 | + kfree(sbinfo); | |
19615 | +} | |
19616 | + | |
19617 | +int au_si_alloc(struct super_block *sb) | |
19618 | +{ | |
19619 | + int err; | |
19620 | + struct au_sbinfo *sbinfo; | |
19621 | + | |
19622 | + err = -ENOMEM; | |
4a4d8108 | 19623 | + sbinfo = kzalloc(sizeof(*sbinfo), GFP_NOFS); |
1facf9fc | 19624 | + if (unlikely(!sbinfo)) |
19625 | + goto out; | |
19626 | + | |
b752ccd1 AM |
19627 | + BUILD_BUG_ON(sizeof(unsigned long) != |
19628 | + sizeof(*sbinfo->au_si_pid.bitmap)); | |
19629 | + sbinfo->au_si_pid.bitmap = kcalloc(BITS_TO_LONGS(PID_MAX_DEFAULT), | |
19630 | + sizeof(*sbinfo->au_si_pid.bitmap), | |
19631 | + GFP_NOFS); | |
19632 | + if (unlikely(!sbinfo->au_si_pid.bitmap)) | |
19633 | + goto out_sbinfo; | |
19634 | + | |
1facf9fc | 19635 | + /* will be reallocated separately */ |
19636 | + sbinfo->si_branch = kzalloc(sizeof(*sbinfo->si_branch), GFP_NOFS); | |
19637 | + if (unlikely(!sbinfo->si_branch)) | |
b752ccd1 | 19638 | + goto out_pidmap; |
1facf9fc | 19639 | + |
1facf9fc | 19640 | + err = sysaufs_si_init(sbinfo); |
19641 | + if (unlikely(err)) | |
19642 | + goto out_br; | |
19643 | + | |
19644 | + au_nwt_init(&sbinfo->si_nowait); | |
dece6358 | 19645 | + au_rw_init_wlock(&sbinfo->si_rwsem); |
b752ccd1 AM |
19646 | + spin_lock_init(&sbinfo->au_si_pid.tree_lock); |
19647 | + INIT_RADIX_TREE(&sbinfo->au_si_pid.tree, GFP_ATOMIC | __GFP_NOFAIL); | |
19648 | + | |
1facf9fc | 19649 | + sbinfo->si_bend = -1; |
1facf9fc | 19650 | + |
19651 | + sbinfo->si_wbr_copyup = AuWbrCopyup_Def; | |
19652 | + sbinfo->si_wbr_create = AuWbrCreate_Def; | |
4a4d8108 AM |
19653 | + sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + sbinfo->si_wbr_copyup; |
19654 | + sbinfo->si_wbr_create_ops = au_wbr_create_ops + sbinfo->si_wbr_create; | |
1facf9fc | 19655 | + |
953406b4 | 19656 | + sbinfo->si_mntflags = AuOpt_Def; |
1facf9fc | 19657 | + |
1facf9fc | 19658 | + mutex_init(&sbinfo->si_xib_mtx); |
1facf9fc | 19659 | + sbinfo->si_xino_brid = -1; |
19660 | + /* leave si_xib_last_pindex and si_xib_next_bit */ | |
19661 | + | |
953406b4 | 19662 | + sbinfo->si_rdcache = AUFS_RDCACHE_DEF * HZ; |
1facf9fc | 19663 | + sbinfo->si_rdblk = AUFS_RDBLK_DEF; |
19664 | + sbinfo->si_rdhash = AUFS_RDHASH_DEF; | |
19665 | + sbinfo->si_dirwh = AUFS_DIRWH_DEF; | |
19666 | + | |
19667 | + au_spl_init(&sbinfo->si_plink); | |
19668 | + init_waitqueue_head(&sbinfo->si_plink_wq); | |
4a4d8108 | 19669 | + spin_lock_init(&sbinfo->si_plink_maint_lock); |
1facf9fc | 19670 | + |
19671 | + /* leave other members for sysaufs and si_mnt. */ | |
19672 | + sbinfo->si_sb = sb; | |
19673 | + sb->s_fs_info = sbinfo; | |
b752ccd1 | 19674 | + si_pid_set(sb); |
1facf9fc | 19675 | + au_debug_sbinfo_init(sbinfo); |
19676 | + return 0; /* success */ | |
19677 | + | |
4f0767ce | 19678 | +out_br: |
1facf9fc | 19679 | + kfree(sbinfo->si_branch); |
4f0767ce | 19680 | +out_pidmap: |
b752ccd1 | 19681 | + kfree(sbinfo->au_si_pid.bitmap); |
4f0767ce | 19682 | +out_sbinfo: |
1facf9fc | 19683 | + kfree(sbinfo); |
4f0767ce | 19684 | +out: |
1facf9fc | 19685 | + return err; |
19686 | +} | |
19687 | + | |
19688 | +int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr) | |
19689 | +{ | |
19690 | + int err, sz; | |
19691 | + struct au_branch **brp; | |
19692 | + | |
dece6358 AM |
19693 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
19694 | + | |
1facf9fc | 19695 | + err = -ENOMEM; |
19696 | + sz = sizeof(*brp) * (sbinfo->si_bend + 1); | |
19697 | + if (unlikely(!sz)) | |
19698 | + sz = sizeof(*brp); | |
19699 | + brp = au_kzrealloc(sbinfo->si_branch, sz, sizeof(*brp) * nbr, GFP_NOFS); | |
19700 | + if (brp) { | |
19701 | + sbinfo->si_branch = brp; | |
19702 | + err = 0; | |
19703 | + } | |
19704 | + | |
19705 | + return err; | |
19706 | +} | |
19707 | + | |
19708 | +/* ---------------------------------------------------------------------- */ | |
19709 | + | |
19710 | +unsigned int au_sigen_inc(struct super_block *sb) | |
19711 | +{ | |
19712 | + unsigned int gen; | |
19713 | + | |
dece6358 AM |
19714 | + SiMustWriteLock(sb); |
19715 | + | |
1facf9fc | 19716 | + gen = ++au_sbi(sb)->si_generation; |
19717 | + au_update_digen(sb->s_root); | |
19718 | + au_update_iigen(sb->s_root->d_inode); | |
19719 | + sb->s_root->d_inode->i_version++; | |
19720 | + return gen; | |
19721 | +} | |
19722 | + | |
19723 | +aufs_bindex_t au_new_br_id(struct super_block *sb) | |
19724 | +{ | |
19725 | + aufs_bindex_t br_id; | |
19726 | + int i; | |
19727 | + struct au_sbinfo *sbinfo; | |
19728 | + | |
dece6358 AM |
19729 | + SiMustWriteLock(sb); |
19730 | + | |
1facf9fc | 19731 | + sbinfo = au_sbi(sb); |
19732 | + for (i = 0; i <= AUFS_BRANCH_MAX; i++) { | |
19733 | + br_id = ++sbinfo->si_last_br_id; | |
19734 | + if (br_id && au_br_index(sb, br_id) < 0) | |
19735 | + return br_id; | |
19736 | + } | |
19737 | + | |
19738 | + return -1; | |
19739 | +} | |
19740 | + | |
19741 | +/* ---------------------------------------------------------------------- */ | |
19742 | + | |
19743 | +/* dentry and super_block lock. call at entry point */ | |
953406b4 | 19744 | +void aufs_read_lock(struct dentry *dentry, int flags) |
1facf9fc | 19745 | +{ |
953406b4 AM |
19746 | + si_read_lock(dentry->d_sb, flags); |
19747 | + if (au_ftest_lock(flags, DW)) | |
19748 | + di_write_lock_child(dentry); | |
19749 | + else | |
19750 | + di_read_lock_child(dentry, flags); | |
1facf9fc | 19751 | +} |
19752 | + | |
19753 | +void aufs_read_unlock(struct dentry *dentry, int flags) | |
19754 | +{ | |
19755 | + if (au_ftest_lock(flags, DW)) | |
19756 | + di_write_unlock(dentry); | |
19757 | + else | |
19758 | + di_read_unlock(dentry, flags); | |
19759 | + si_read_unlock(dentry->d_sb); | |
19760 | +} | |
19761 | + | |
19762 | +void aufs_write_lock(struct dentry *dentry) | |
19763 | +{ | |
953406b4 | 19764 | + si_write_lock(dentry->d_sb); |
1facf9fc | 19765 | + di_write_lock_child(dentry); |
19766 | +} | |
19767 | + | |
19768 | +void aufs_write_unlock(struct dentry *dentry) | |
19769 | +{ | |
19770 | + di_write_unlock(dentry); | |
19771 | + si_write_unlock(dentry->d_sb); | |
19772 | +} | |
19773 | + | |
953406b4 | 19774 | +void aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags) |
1facf9fc | 19775 | +{ |
953406b4 AM |
19776 | + si_read_lock(d1->d_sb, flags); |
19777 | + di_write_lock2_child(d1, d2, au_ftest_lock(flags, DIR)); | |
1facf9fc | 19778 | +} |
19779 | + | |
19780 | +void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2) | |
19781 | +{ | |
19782 | + di_write_unlock2(d1, d2); | |
19783 | + si_read_unlock(d1->d_sb); | |
19784 | +} | |
b752ccd1 AM |
19785 | + |
19786 | +/* ---------------------------------------------------------------------- */ | |
19787 | + | |
19788 | +int si_pid_test_slow(struct super_block *sb) | |
19789 | +{ | |
19790 | + void *p; | |
19791 | + | |
19792 | + rcu_read_lock(); | |
19793 | + p = radix_tree_lookup(&au_sbi(sb)->au_si_pid.tree, current->pid); | |
19794 | + rcu_read_unlock(); | |
19795 | + | |
19796 | + return (long)p; | |
19797 | +} | |
19798 | + | |
19799 | +void si_pid_set_slow(struct super_block *sb) | |
19800 | +{ | |
19801 | + int err; | |
19802 | + struct au_sbinfo *sbinfo; | |
19803 | + | |
19804 | + AuDebugOn(si_pid_test_slow(sb)); | |
19805 | + | |
19806 | + sbinfo = au_sbi(sb); | |
19807 | + err = radix_tree_preload(GFP_NOFS | __GFP_NOFAIL); | |
19808 | + AuDebugOn(err); | |
19809 | + spin_lock(&sbinfo->au_si_pid.tree_lock); | |
19810 | + err = radix_tree_insert(&sbinfo->au_si_pid.tree, current->pid, | |
19811 | + (void *)1); | |
19812 | + spin_unlock(&sbinfo->au_si_pid.tree_lock); | |
19813 | + AuDebugOn(err); | |
19814 | + radix_tree_preload_end(); | |
19815 | +} | |
19816 | + | |
19817 | +void si_pid_clr_slow(struct super_block *sb) | |
19818 | +{ | |
19819 | + void *p; | |
19820 | + struct au_sbinfo *sbinfo; | |
19821 | + | |
19822 | + AuDebugOn(!si_pid_test_slow(sb)); | |
19823 | + | |
19824 | + sbinfo = au_sbi(sb); | |
19825 | + spin_lock(&sbinfo->au_si_pid.tree_lock); | |
19826 | + p = radix_tree_delete(&sbinfo->au_si_pid.tree, current->pid); | |
19827 | + spin_unlock(&sbinfo->au_si_pid.tree_lock); | |
19828 | + AuDebugOn(1 != (long)p); | |
19829 | +} | |
19830 | diff -urN /usr/share/empty/fs/aufs/spl.h linux/fs/aufs/spl.h | |
19831 | --- /usr/share/empty/fs/aufs/spl.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 19832 | +++ linux/fs/aufs/spl.h 2010-10-21 09:52:43.093625591 +0200 |
4a4d8108 | 19833 | @@ -0,0 +1,66 @@ |
1facf9fc | 19834 | +/* |
4a4d8108 | 19835 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 19836 | + * |
19837 | + * This program, aufs is free software; you can redistribute it and/or modify | |
19838 | + * it under the terms of the GNU General Public License as published by | |
19839 | + * the Free Software Foundation; either version 2 of the License, or | |
19840 | + * (at your option) any later version. | |
dece6358 AM |
19841 | + * |
19842 | + * This program is distributed in the hope that it will be useful, | |
19843 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19844 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19845 | + * GNU General Public License for more details. | |
19846 | + * | |
19847 | + * You should have received a copy of the GNU General Public License | |
19848 | + * along with this program; if not, write to the Free Software | |
19849 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 19850 | + */ |
19851 | + | |
19852 | +/* | |
19853 | + * simple list protected by a spinlock | |
19854 | + */ | |
19855 | + | |
19856 | +#ifndef __AUFS_SPL_H__ | |
19857 | +#define __AUFS_SPL_H__ | |
19858 | + | |
19859 | +#ifdef __KERNEL__ | |
19860 | + | |
dece6358 AM |
19861 | +#include <linux/spinlock.h> |
19862 | +#include <linux/list.h> | |
4a4d8108 | 19863 | +#include <linux/rculist.h> |
1facf9fc | 19864 | + |
19865 | +struct au_splhead { | |
19866 | + spinlock_t spin; | |
19867 | + struct list_head head; | |
19868 | +}; | |
19869 | + | |
19870 | +static inline void au_spl_init(struct au_splhead *spl) | |
19871 | +{ | |
19872 | + spin_lock_init(&spl->spin); | |
19873 | + INIT_LIST_HEAD(&spl->head); | |
19874 | +} | |
19875 | + | |
19876 | +static inline void au_spl_add(struct list_head *list, struct au_splhead *spl) | |
19877 | +{ | |
19878 | + spin_lock(&spl->spin); | |
19879 | + list_add(list, &spl->head); | |
19880 | + spin_unlock(&spl->spin); | |
19881 | +} | |
19882 | + | |
19883 | +static inline void au_spl_del(struct list_head *list, struct au_splhead *spl) | |
19884 | +{ | |
19885 | + spin_lock(&spl->spin); | |
19886 | + list_del(list); | |
19887 | + spin_unlock(&spl->spin); | |
19888 | +} | |
19889 | + | |
4a4d8108 AM |
19890 | +static inline void au_spl_del_rcu(struct list_head *list, |
19891 | + struct au_splhead *spl) | |
19892 | +{ | |
19893 | + spin_lock(&spl->spin); | |
19894 | + list_del_rcu(list); | |
19895 | + spin_unlock(&spl->spin); | |
19896 | +} | |
19897 | + | |
1facf9fc | 19898 | +#endif /* __KERNEL__ */ |
19899 | +#endif /* __AUFS_SPL_H__ */ | |
b752ccd1 AM |
19900 | diff -urN /usr/share/empty/fs/aufs/super.c linux/fs/aufs/super.c |
19901 | --- /usr/share/empty/fs/aufs/super.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
19902 | +++ linux/fs/aufs/super.c 2010-10-21 09:52:43.093625591 +0200 |
19903 | @@ -0,0 +1,852 @@ | |
1facf9fc | 19904 | +/* |
4a4d8108 | 19905 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 19906 | + * |
19907 | + * This program, aufs is free software; you can redistribute it and/or modify | |
19908 | + * it under the terms of the GNU General Public License as published by | |
19909 | + * the Free Software Foundation; either version 2 of the License, or | |
19910 | + * (at your option) any later version. | |
dece6358 AM |
19911 | + * |
19912 | + * This program is distributed in the hope that it will be useful, | |
19913 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19914 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19915 | + * GNU General Public License for more details. | |
19916 | + * | |
19917 | + * You should have received a copy of the GNU General Public License | |
19918 | + * along with this program; if not, write to the Free Software | |
19919 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 19920 | + */ |
19921 | + | |
19922 | +/* | |
19923 | + * mount and super_block operations | |
19924 | + */ | |
19925 | + | |
19926 | +#include <linux/buffer_head.h> | |
dece6358 | 19927 | +#include <linux/module.h> |
1facf9fc | 19928 | +#include <linux/seq_file.h> |
19929 | +#include <linux/statfs.h> | |
19930 | +#include "aufs.h" | |
19931 | + | |
19932 | +/* | |
19933 | + * super_operations | |
19934 | + */ | |
19935 | +static struct inode *aufs_alloc_inode(struct super_block *sb __maybe_unused) | |
19936 | +{ | |
19937 | + struct au_icntnr *c; | |
19938 | + | |
19939 | + c = au_cache_alloc_icntnr(); | |
19940 | + if (c) { | |
1facf9fc | 19941 | + c->vfs_inode.i_version = 1; /* sigen(sb); */ |
19942 | + c->iinfo.ii_hinode = NULL; | |
19943 | + return &c->vfs_inode; | |
19944 | + } | |
19945 | + return NULL; | |
19946 | +} | |
19947 | + | |
19948 | +static void aufs_destroy_inode(struct inode *inode) | |
19949 | +{ | |
19950 | + au_iinfo_fin(inode); | |
19951 | + au_cache_free_icntnr(container_of(inode, struct au_icntnr, vfs_inode)); | |
19952 | +} | |
19953 | + | |
19954 | +struct inode *au_iget_locked(struct super_block *sb, ino_t ino) | |
19955 | +{ | |
19956 | + struct inode *inode; | |
19957 | + int err; | |
19958 | + | |
19959 | + inode = iget_locked(sb, ino); | |
19960 | + if (unlikely(!inode)) { | |
19961 | + inode = ERR_PTR(-ENOMEM); | |
19962 | + goto out; | |
19963 | + } | |
19964 | + if (!(inode->i_state & I_NEW)) | |
19965 | + goto out; | |
19966 | + | |
19967 | + err = au_xigen_new(inode); | |
19968 | + if (!err) | |
19969 | + err = au_iinfo_init(inode); | |
19970 | + if (!err) | |
19971 | + inode->i_version++; | |
19972 | + else { | |
19973 | + iget_failed(inode); | |
19974 | + inode = ERR_PTR(err); | |
19975 | + } | |
19976 | + | |
4f0767ce | 19977 | +out: |
1facf9fc | 19978 | + /* never return NULL */ |
19979 | + AuDebugOn(!inode); | |
19980 | + AuTraceErrPtr(inode); | |
19981 | + return inode; | |
19982 | +} | |
19983 | + | |
19984 | +/* lock free root dinfo */ | |
19985 | +static int au_show_brs(struct seq_file *seq, struct super_block *sb) | |
19986 | +{ | |
19987 | + int err; | |
19988 | + aufs_bindex_t bindex, bend; | |
19989 | + struct path path; | |
4a4d8108 | 19990 | + struct au_hdentry *hdp; |
1facf9fc | 19991 | + struct au_branch *br; |
19992 | + | |
19993 | + err = 0; | |
19994 | + bend = au_sbend(sb); | |
4a4d8108 | 19995 | + hdp = au_di(sb->s_root)->di_hdentry; |
1facf9fc | 19996 | + for (bindex = 0; !err && bindex <= bend; bindex++) { |
19997 | + br = au_sbr(sb, bindex); | |
19998 | + path.mnt = br->br_mnt; | |
4a4d8108 | 19999 | + path.dentry = hdp[bindex].hd_dentry; |
1facf9fc | 20000 | + err = au_seq_path(seq, &path); |
20001 | + if (err > 0) | |
20002 | + err = seq_printf(seq, "=%s", | |
20003 | + au_optstr_br_perm(br->br_perm)); | |
20004 | + if (!err && bindex != bend) | |
20005 | + err = seq_putc(seq, ':'); | |
20006 | + } | |
20007 | + | |
20008 | + return err; | |
20009 | +} | |
20010 | + | |
20011 | +static void au_show_wbr_create(struct seq_file *m, int v, | |
20012 | + struct au_sbinfo *sbinfo) | |
20013 | +{ | |
20014 | + const char *pat; | |
20015 | + | |
dece6358 AM |
20016 | + AuRwMustAnyLock(&sbinfo->si_rwsem); |
20017 | + | |
1facf9fc | 20018 | + seq_printf(m, ",create="); |
20019 | + pat = au_optstr_wbr_create(v); | |
20020 | + switch (v) { | |
20021 | + case AuWbrCreate_TDP: | |
20022 | + case AuWbrCreate_RR: | |
20023 | + case AuWbrCreate_MFS: | |
20024 | + case AuWbrCreate_PMFS: | |
20025 | + seq_printf(m, pat); | |
20026 | + break; | |
20027 | + case AuWbrCreate_MFSV: | |
20028 | + seq_printf(m, /*pat*/"mfs:%lu", | |
953406b4 | 20029 | + sbinfo->si_wbr_mfs.mfs_expire / HZ); |
1facf9fc | 20030 | + break; |
20031 | + case AuWbrCreate_PMFSV: | |
20032 | + seq_printf(m, /*pat*/"pmfs:%lu", | |
953406b4 | 20033 | + sbinfo->si_wbr_mfs.mfs_expire / HZ); |
1facf9fc | 20034 | + break; |
20035 | + case AuWbrCreate_MFSRR: | |
20036 | + seq_printf(m, /*pat*/"mfsrr:%llu", | |
20037 | + sbinfo->si_wbr_mfs.mfsrr_watermark); | |
20038 | + break; | |
20039 | + case AuWbrCreate_MFSRRV: | |
20040 | + seq_printf(m, /*pat*/"mfsrr:%llu:%lu", | |
20041 | + sbinfo->si_wbr_mfs.mfsrr_watermark, | |
953406b4 | 20042 | + sbinfo->si_wbr_mfs.mfs_expire / HZ); |
1facf9fc | 20043 | + break; |
20044 | + } | |
20045 | +} | |
20046 | + | |
20047 | +static int au_show_xino(struct seq_file *seq, struct vfsmount *mnt) | |
20048 | +{ | |
20049 | +#ifdef CONFIG_SYSFS | |
20050 | + return 0; | |
20051 | +#else | |
20052 | + int err; | |
20053 | + const int len = sizeof(AUFS_XINO_FNAME) - 1; | |
20054 | + aufs_bindex_t bindex, brid; | |
20055 | + struct super_block *sb; | |
20056 | + struct qstr *name; | |
20057 | + struct file *f; | |
20058 | + struct dentry *d, *h_root; | |
4a4d8108 | 20059 | + struct au_hdentry *hdp; |
1facf9fc | 20060 | + |
dece6358 AM |
20061 | + AuRwMustAnyLock(&sbinfo->si_rwsem); |
20062 | + | |
1facf9fc | 20063 | + err = 0; |
20064 | + sb = mnt->mnt_sb; | |
20065 | + f = au_sbi(sb)->si_xib; | |
20066 | + if (!f) | |
20067 | + goto out; | |
20068 | + | |
20069 | + /* stop printing the default xino path on the first writable branch */ | |
20070 | + h_root = NULL; | |
20071 | + brid = au_xino_brid(sb); | |
20072 | + if (brid >= 0) { | |
20073 | + bindex = au_br_index(sb, brid); | |
4a4d8108 AM |
20074 | + hdp = au_di(sb->s_root)->di_hdentry; |
20075 | + h_root = hdp[0 + bindex].hd_dentry; | |
1facf9fc | 20076 | + } |
20077 | + d = f->f_dentry; | |
20078 | + name = &d->d_name; | |
20079 | + /* safe ->d_parent because the file is unlinked */ | |
20080 | + if (d->d_parent == h_root | |
20081 | + && name->len == len | |
20082 | + && !memcmp(name->name, AUFS_XINO_FNAME, len)) | |
20083 | + goto out; | |
20084 | + | |
20085 | + seq_puts(seq, ",xino="); | |
20086 | + err = au_xino_path(seq, f); | |
20087 | + | |
4f0767ce | 20088 | +out: |
1facf9fc | 20089 | + return err; |
20090 | +#endif | |
20091 | +} | |
20092 | + | |
20093 | +/* seq_file will re-call me in case of too long string */ | |
20094 | +static int aufs_show_options(struct seq_file *m, struct vfsmount *mnt) | |
20095 | +{ | |
20096 | + int err, n; | |
20097 | + unsigned int mnt_flags, v; | |
20098 | + struct super_block *sb; | |
20099 | + struct au_sbinfo *sbinfo; | |
20100 | + | |
20101 | +#define AuBool(name, str) do { \ | |
20102 | + v = au_opt_test(mnt_flags, name); \ | |
20103 | + if (v != au_opt_test(AuOpt_Def, name)) \ | |
20104 | + seq_printf(m, ",%s" #str, v ? "" : "no"); \ | |
20105 | +} while (0) | |
20106 | + | |
20107 | +#define AuStr(name, str) do { \ | |
20108 | + v = mnt_flags & AuOptMask_##name; \ | |
20109 | + if (v != (AuOpt_Def & AuOptMask_##name)) \ | |
20110 | + seq_printf(m, "," #str "=%s", au_optstr_##str(v)); \ | |
20111 | +} while (0) | |
20112 | + | |
20113 | +#define AuUInt(name, str, val) do { \ | |
20114 | + if (val != AUFS_##name##_DEF) \ | |
20115 | + seq_printf(m, "," #str "=%u", val); \ | |
20116 | +} while (0) | |
20117 | + | |
20118 | + /* lock free root dinfo */ | |
20119 | + sb = mnt->mnt_sb; | |
20120 | + si_noflush_read_lock(sb); | |
20121 | + sbinfo = au_sbi(sb); | |
20122 | + seq_printf(m, ",si=%lx", sysaufs_si_id(sbinfo)); | |
20123 | + | |
20124 | + mnt_flags = au_mntflags(sb); | |
20125 | + if (au_opt_test(mnt_flags, XINO)) { | |
20126 | + err = au_show_xino(m, mnt); | |
20127 | + if (unlikely(err)) | |
20128 | + goto out; | |
20129 | + } else | |
20130 | + seq_puts(m, ",noxino"); | |
20131 | + | |
20132 | + AuBool(TRUNC_XINO, trunc_xino); | |
20133 | + AuStr(UDBA, udba); | |
dece6358 | 20134 | + AuBool(SHWH, shwh); |
1facf9fc | 20135 | + AuBool(PLINK, plink); |
4a4d8108 | 20136 | + AuBool(DIO, dio); |
1facf9fc | 20137 | + /* AuBool(DIRPERM1, dirperm1); */ |
20138 | + /* AuBool(REFROF, refrof); */ | |
20139 | + | |
20140 | + v = sbinfo->si_wbr_create; | |
20141 | + if (v != AuWbrCreate_Def) | |
20142 | + au_show_wbr_create(m, v, sbinfo); | |
20143 | + | |
20144 | + v = sbinfo->si_wbr_copyup; | |
20145 | + if (v != AuWbrCopyup_Def) | |
20146 | + seq_printf(m, ",cpup=%s", au_optstr_wbr_copyup(v)); | |
20147 | + | |
20148 | + v = au_opt_test(mnt_flags, ALWAYS_DIROPQ); | |
20149 | + if (v != au_opt_test(AuOpt_Def, ALWAYS_DIROPQ)) | |
20150 | + seq_printf(m, ",diropq=%c", v ? 'a' : 'w'); | |
20151 | + | |
20152 | + AuUInt(DIRWH, dirwh, sbinfo->si_dirwh); | |
20153 | + | |
953406b4 | 20154 | + n = sbinfo->si_rdcache / HZ; |
1facf9fc | 20155 | + AuUInt(RDCACHE, rdcache, n); |
20156 | + | |
20157 | + AuUInt(RDBLK, rdblk, sbinfo->si_rdblk); | |
20158 | + AuUInt(RDHASH, rdhash, sbinfo->si_rdhash); | |
20159 | + | |
20160 | + AuBool(SUM, sum); | |
20161 | + /* AuBool(SUM_W, wsum); */ | |
20162 | + AuBool(WARN_PERM, warn_perm); | |
20163 | + AuBool(VERBOSE, verbose); | |
20164 | + | |
4f0767ce | 20165 | +out: |
1facf9fc | 20166 | + /* be sure to print "br:" last */ |
20167 | + if (!sysaufs_brs) { | |
20168 | + seq_puts(m, ",br:"); | |
20169 | + au_show_brs(m, sb); | |
20170 | + } | |
20171 | + si_read_unlock(sb); | |
20172 | + return 0; | |
20173 | + | |
1facf9fc | 20174 | +#undef AuBool |
20175 | +#undef AuStr | |
4a4d8108 | 20176 | +#undef AuUInt |
1facf9fc | 20177 | +} |
20178 | + | |
20179 | +/* ---------------------------------------------------------------------- */ | |
20180 | + | |
20181 | +/* sum mode which returns the summation for statfs(2) */ | |
20182 | + | |
20183 | +static u64 au_add_till_max(u64 a, u64 b) | |
20184 | +{ | |
20185 | + u64 old; | |
20186 | + | |
20187 | + old = a; | |
20188 | + a += b; | |
20189 | + if (old < a) | |
20190 | + return a; | |
20191 | + return ULLONG_MAX; | |
20192 | +} | |
20193 | + | |
20194 | +static int au_statfs_sum(struct super_block *sb, struct kstatfs *buf) | |
20195 | +{ | |
20196 | + int err; | |
20197 | + u64 blocks, bfree, bavail, files, ffree; | |
20198 | + aufs_bindex_t bend, bindex, i; | |
20199 | + unsigned char shared; | |
953406b4 | 20200 | + struct path h_path; |
1facf9fc | 20201 | + struct super_block *h_sb; |
20202 | + | |
20203 | + blocks = 0; | |
20204 | + bfree = 0; | |
20205 | + bavail = 0; | |
20206 | + files = 0; | |
20207 | + ffree = 0; | |
20208 | + | |
20209 | + err = 0; | |
20210 | + bend = au_sbend(sb); | |
20211 | + for (bindex = bend; bindex >= 0; bindex--) { | |
953406b4 AM |
20212 | + h_path.mnt = au_sbr_mnt(sb, bindex); |
20213 | + h_sb = h_path.mnt->mnt_sb; | |
1facf9fc | 20214 | + shared = 0; |
20215 | + for (i = bindex + 1; !shared && i <= bend; i++) | |
20216 | + shared = (au_sbr_sb(sb, i) == h_sb); | |
20217 | + if (shared) | |
20218 | + continue; | |
20219 | + | |
20220 | + /* sb->s_root for NFS is unreliable */ | |
953406b4 AM |
20221 | + h_path.dentry = h_path.mnt->mnt_root; |
20222 | + err = vfs_statfs(&h_path, buf); | |
1facf9fc | 20223 | + if (unlikely(err)) |
20224 | + goto out; | |
20225 | + | |
20226 | + blocks = au_add_till_max(blocks, buf->f_blocks); | |
20227 | + bfree = au_add_till_max(bfree, buf->f_bfree); | |
20228 | + bavail = au_add_till_max(bavail, buf->f_bavail); | |
20229 | + files = au_add_till_max(files, buf->f_files); | |
20230 | + ffree = au_add_till_max(ffree, buf->f_ffree); | |
20231 | + } | |
20232 | + | |
20233 | + buf->f_blocks = blocks; | |
20234 | + buf->f_bfree = bfree; | |
20235 | + buf->f_bavail = bavail; | |
20236 | + buf->f_files = files; | |
20237 | + buf->f_ffree = ffree; | |
20238 | + | |
4f0767ce | 20239 | +out: |
1facf9fc | 20240 | + return err; |
20241 | +} | |
20242 | + | |
20243 | +static int aufs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
20244 | +{ | |
20245 | + int err; | |
953406b4 | 20246 | + struct path h_path; |
1facf9fc | 20247 | + struct super_block *sb; |
20248 | + | |
20249 | + /* lock free root dinfo */ | |
20250 | + sb = dentry->d_sb; | |
20251 | + si_noflush_read_lock(sb); | |
953406b4 | 20252 | + if (!au_opt_test(au_mntflags(sb), SUM)) { |
1facf9fc | 20253 | + /* sb->s_root for NFS is unreliable */ |
953406b4 AM |
20254 | + h_path.mnt = au_sbr_mnt(sb, 0); |
20255 | + h_path.dentry = h_path.mnt->mnt_root; | |
20256 | + err = vfs_statfs(&h_path, buf); | |
20257 | + } else | |
1facf9fc | 20258 | + err = au_statfs_sum(sb, buf); |
20259 | + si_read_unlock(sb); | |
20260 | + | |
20261 | + if (!err) { | |
20262 | + buf->f_type = AUFS_SUPER_MAGIC; | |
4a4d8108 | 20263 | + buf->f_namelen = AUFS_MAX_NAMELEN; |
1facf9fc | 20264 | + memset(&buf->f_fsid, 0, sizeof(buf->f_fsid)); |
20265 | + } | |
20266 | + /* buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; */ | |
20267 | + | |
20268 | + return err; | |
20269 | +} | |
20270 | + | |
20271 | +/* ---------------------------------------------------------------------- */ | |
20272 | + | |
953406b4 AM |
20273 | +/* |
20274 | + * this IS NOT for super_operations. | |
20275 | + * I guess it will be reverted someday. | |
20276 | + */ | |
20277 | +static void aufs_umount_begin(struct super_block *sb) | |
20278 | +{ | |
20279 | + struct au_sbinfo *sbinfo; | |
20280 | + | |
20281 | + sbinfo = au_sbi(sb); | |
20282 | + if (!sbinfo) | |
20283 | + return; | |
20284 | + | |
20285 | + si_write_lock(sb); | |
20286 | + if (au_opt_test(au_mntflags(sb), PLINK)) | |
20287 | + au_plink_put(sb); | |
20288 | + if (sbinfo->si_wbr_create_ops->fin) | |
20289 | + sbinfo->si_wbr_create_ops->fin(sb); | |
20290 | + si_write_unlock(sb); | |
20291 | +} | |
20292 | + | |
1facf9fc | 20293 | +/* final actions when unmounting a file system */ |
20294 | +static void aufs_put_super(struct super_block *sb) | |
20295 | +{ | |
20296 | + struct au_sbinfo *sbinfo; | |
20297 | + | |
20298 | + sbinfo = au_sbi(sb); | |
20299 | + if (!sbinfo) | |
20300 | + return; | |
20301 | + | |
953406b4 | 20302 | + aufs_umount_begin(sb); |
1facf9fc | 20303 | + dbgaufs_si_fin(sbinfo); |
20304 | + kobject_put(&sbinfo->si_kobj); | |
20305 | +} | |
20306 | + | |
20307 | +/* ---------------------------------------------------------------------- */ | |
20308 | + | |
20309 | +/* | |
20310 | + * refresh dentry and inode at remount time. | |
20311 | + */ | |
20312 | +static int do_refresh(struct dentry *dentry, mode_t type, | |
20313 | + unsigned int dir_flags) | |
20314 | +{ | |
20315 | + int err; | |
20316 | + struct dentry *parent; | |
20317 | + | |
20318 | + di_write_lock_child(dentry); | |
20319 | + parent = dget_parent(dentry); | |
20320 | + di_read_lock_parent(parent, AuLock_IR); | |
20321 | + | |
20322 | + /* returns the number of positive dentries */ | |
20323 | + err = au_refresh_hdentry(dentry, type); | |
20324 | + if (err >= 0) { | |
20325 | + struct inode *inode = dentry->d_inode; | |
20326 | + err = au_refresh_hinode(inode, dentry); | |
20327 | + if (!err && type == S_IFDIR) | |
4a4d8108 | 20328 | + au_hn_reset(inode, dir_flags); |
1facf9fc | 20329 | + } |
20330 | + if (unlikely(err)) | |
4a4d8108 AM |
20331 | + pr_err("unrecoverable error %d, %.*s\n", |
20332 | + err, AuDLNPair(dentry)); | |
1facf9fc | 20333 | + |
20334 | + di_read_unlock(parent, AuLock_IR); | |
20335 | + dput(parent); | |
20336 | + di_write_unlock(dentry); | |
20337 | + | |
20338 | + return err; | |
20339 | +} | |
20340 | + | |
20341 | +static int test_dir(struct dentry *dentry, void *arg __maybe_unused) | |
20342 | +{ | |
20343 | + return S_ISDIR(dentry->d_inode->i_mode); | |
20344 | +} | |
20345 | + | |
20346 | +/* gave up consolidating with refresh_nondir() */ | |
20347 | +static int refresh_dir(struct dentry *root, unsigned int sigen) | |
20348 | +{ | |
20349 | + int err, i, j, ndentry, e; | |
20350 | + struct au_dcsub_pages dpages; | |
20351 | + struct au_dpage *dpage; | |
20352 | + struct dentry **dentries; | |
20353 | + struct inode *inode; | |
20354 | + const unsigned int flags = au_hi_flags(root->d_inode, /*isdir*/1); | |
20355 | + | |
20356 | + err = 0; | |
20357 | + list_for_each_entry(inode, &root->d_sb->s_inodes, i_sb_list) | |
20358 | + if (S_ISDIR(inode->i_mode) && au_iigen(inode) != sigen) { | |
20359 | + ii_write_lock_child(inode); | |
20360 | + e = au_refresh_hinode_self(inode, /*do_attr*/1); | |
20361 | + ii_write_unlock(inode); | |
20362 | + if (unlikely(e)) { | |
20363 | + AuDbg("e %d, i%lu\n", e, inode->i_ino); | |
20364 | + if (!err) | |
20365 | + err = e; | |
20366 | + /* go on even if err */ | |
20367 | + } | |
20368 | + } | |
20369 | + | |
20370 | + e = au_dpages_init(&dpages, GFP_NOFS); | |
20371 | + if (unlikely(e)) { | |
20372 | + if (!err) | |
20373 | + err = e; | |
20374 | + goto out; | |
20375 | + } | |
20376 | + e = au_dcsub_pages(&dpages, root, test_dir, NULL); | |
20377 | + if (unlikely(e)) { | |
20378 | + if (!err) | |
20379 | + err = e; | |
20380 | + goto out_dpages; | |
20381 | + } | |
20382 | + | |
20383 | + for (i = 0; !e && i < dpages.ndpage; i++) { | |
20384 | + dpage = dpages.dpages + i; | |
20385 | + dentries = dpage->dentries; | |
20386 | + ndentry = dpage->ndentry; | |
20387 | + for (j = 0; !e && j < ndentry; j++) { | |
20388 | + struct dentry *d; | |
20389 | + | |
20390 | + d = dentries[j]; | |
20391 | + au_dbg_verify_dir_parent(d, sigen); | |
20392 | + if (au_digen(d) != sigen) { | |
20393 | + e = do_refresh(d, S_IFDIR, flags); | |
20394 | + if (unlikely(e && !err)) | |
20395 | + err = e; | |
20396 | + /* break on err */ | |
20397 | + } | |
20398 | + } | |
20399 | + } | |
20400 | + | |
4f0767ce | 20401 | +out_dpages: |
1facf9fc | 20402 | + au_dpages_free(&dpages); |
4f0767ce | 20403 | +out: |
1facf9fc | 20404 | + return err; |
20405 | +} | |
20406 | + | |
20407 | +static int test_nondir(struct dentry *dentry, void *arg __maybe_unused) | |
20408 | +{ | |
20409 | + return !S_ISDIR(dentry->d_inode->i_mode); | |
20410 | +} | |
20411 | + | |
20412 | +static int refresh_nondir(struct dentry *root, unsigned int sigen, | |
20413 | + int do_dentry) | |
20414 | +{ | |
20415 | + int err, i, j, ndentry, e; | |
20416 | + struct au_dcsub_pages dpages; | |
20417 | + struct au_dpage *dpage; | |
20418 | + struct dentry **dentries; | |
20419 | + struct inode *inode; | |
20420 | + | |
20421 | + err = 0; | |
20422 | + list_for_each_entry(inode, &root->d_sb->s_inodes, i_sb_list) | |
20423 | + if (!S_ISDIR(inode->i_mode) && au_iigen(inode) != sigen) { | |
20424 | + ii_write_lock_child(inode); | |
20425 | + e = au_refresh_hinode_self(inode, /*do_attr*/1); | |
20426 | + ii_write_unlock(inode); | |
20427 | + if (unlikely(e)) { | |
20428 | + AuDbg("e %d, i%lu\n", e, inode->i_ino); | |
20429 | + if (!err) | |
20430 | + err = e; | |
20431 | + /* go on even if err */ | |
20432 | + } | |
20433 | + } | |
20434 | + | |
20435 | + if (!do_dentry) | |
20436 | + goto out; | |
20437 | + | |
20438 | + e = au_dpages_init(&dpages, GFP_NOFS); | |
20439 | + if (unlikely(e)) { | |
20440 | + if (!err) | |
20441 | + err = e; | |
20442 | + goto out; | |
20443 | + } | |
20444 | + e = au_dcsub_pages(&dpages, root, test_nondir, NULL); | |
20445 | + if (unlikely(e)) { | |
20446 | + if (!err) | |
20447 | + err = e; | |
20448 | + goto out_dpages; | |
20449 | + } | |
20450 | + | |
20451 | + for (i = 0; i < dpages.ndpage; i++) { | |
20452 | + dpage = dpages.dpages + i; | |
20453 | + dentries = dpage->dentries; | |
20454 | + ndentry = dpage->ndentry; | |
20455 | + for (j = 0; j < ndentry; j++) { | |
20456 | + struct dentry *d; | |
20457 | + | |
20458 | + d = dentries[j]; | |
20459 | + au_dbg_verify_nondir_parent(d, sigen); | |
20460 | + inode = d->d_inode; | |
20461 | + if (inode && au_digen(d) != sigen) { | |
20462 | + e = do_refresh(d, inode->i_mode & S_IFMT, | |
20463 | + /*dir_flags*/0); | |
20464 | + if (unlikely(e && !err)) | |
20465 | + err = e; | |
20466 | + /* go on even err */ | |
20467 | + } | |
20468 | + } | |
20469 | + } | |
20470 | + | |
4f0767ce | 20471 | +out_dpages: |
1facf9fc | 20472 | + au_dpages_free(&dpages); |
4f0767ce | 20473 | +out: |
1facf9fc | 20474 | + return err; |
20475 | +} | |
20476 | + | |
20477 | +static void au_remount_refresh(struct super_block *sb, unsigned int flags) | |
20478 | +{ | |
20479 | + int err; | |
20480 | + unsigned int sigen; | |
20481 | + struct au_sbinfo *sbinfo; | |
20482 | + struct dentry *root; | |
20483 | + struct inode *inode; | |
20484 | + | |
20485 | + au_sigen_inc(sb); | |
20486 | + sigen = au_sigen(sb); | |
20487 | + sbinfo = au_sbi(sb); | |
20488 | + au_fclr_si(sbinfo, FAILED_REFRESH_DIRS); | |
20489 | + | |
20490 | + root = sb->s_root; | |
20491 | + DiMustNoWaiters(root); | |
20492 | + inode = root->d_inode; | |
20493 | + IiMustNoWaiters(inode); | |
4a4d8108 | 20494 | + au_hn_reset(inode, au_hi_flags(inode, /*isdir*/1)); |
1facf9fc | 20495 | + di_write_unlock(root); |
20496 | + | |
20497 | + err = refresh_dir(root, sigen); | |
20498 | + if (unlikely(err)) { | |
20499 | + au_fset_si(sbinfo, FAILED_REFRESH_DIRS); | |
4a4d8108 AM |
20500 | + pr_warning("Refreshing directories failed, ignored (%d)\n", |
20501 | + err); | |
1facf9fc | 20502 | + } |
20503 | + | |
20504 | + if (au_ftest_opts(flags, REFRESH_NONDIR)) { | |
20505 | + err = refresh_nondir(root, sigen, !err); | |
20506 | + if (unlikely(err)) | |
4a4d8108 AM |
20507 | + pr_warning("Refreshing non-directories failed, ignored" |
20508 | + "(%d)\n", err); | |
1facf9fc | 20509 | + } |
20510 | + | |
20511 | + /* aufs_write_lock() calls ..._child() */ | |
20512 | + di_write_lock_child(root); | |
20513 | + au_cpup_attr_all(root->d_inode, /*force*/1); | |
20514 | +} | |
20515 | + | |
20516 | +/* stop extra interpretation of errno in mount(8), and strange error messages */ | |
20517 | +static int cvt_err(int err) | |
20518 | +{ | |
20519 | + AuTraceErr(err); | |
20520 | + | |
20521 | + switch (err) { | |
20522 | + case -ENOENT: | |
20523 | + case -ENOTDIR: | |
20524 | + case -EEXIST: | |
20525 | + case -EIO: | |
20526 | + err = -EINVAL; | |
20527 | + } | |
20528 | + return err; | |
20529 | +} | |
20530 | + | |
20531 | +static int aufs_remount_fs(struct super_block *sb, int *flags, char *data) | |
20532 | +{ | |
4a4d8108 AM |
20533 | + int err, do_dx; |
20534 | + unsigned int mntflags; | |
1facf9fc | 20535 | + struct au_opts opts; |
20536 | + struct dentry *root; | |
20537 | + struct inode *inode; | |
20538 | + struct au_sbinfo *sbinfo; | |
20539 | + | |
20540 | + err = 0; | |
20541 | + root = sb->s_root; | |
20542 | + if (!data || !*data) { | |
953406b4 AM |
20543 | + aufs_write_lock(root); |
20544 | + err = au_opts_verify(sb, *flags, /*pending*/0); | |
20545 | + aufs_write_unlock(root); | |
1facf9fc | 20546 | + goto out; |
20547 | + } | |
20548 | + | |
20549 | + err = -ENOMEM; | |
20550 | + memset(&opts, 0, sizeof(opts)); | |
20551 | + opts.opt = (void *)__get_free_page(GFP_NOFS); | |
20552 | + if (unlikely(!opts.opt)) | |
20553 | + goto out; | |
20554 | + opts.max_opt = PAGE_SIZE / sizeof(*opts.opt); | |
20555 | + opts.flags = AuOpts_REMOUNT; | |
20556 | + opts.sb_flags = *flags; | |
20557 | + | |
20558 | + /* parse it before aufs lock */ | |
20559 | + err = au_opts_parse(sb, data, &opts); | |
20560 | + if (unlikely(err)) | |
20561 | + goto out_opts; | |
20562 | + | |
20563 | + sbinfo = au_sbi(sb); | |
20564 | + inode = root->d_inode; | |
20565 | + mutex_lock(&inode->i_mutex); | |
953406b4 | 20566 | + aufs_write_lock(root); |
1facf9fc | 20567 | + |
20568 | + /* au_opts_remount() may return an error */ | |
20569 | + err = au_opts_remount(sb, &opts); | |
20570 | + au_opts_free(&opts); | |
20571 | + | |
20572 | + if (au_ftest_opts(opts.flags, REFRESH_DIR) | |
20573 | + || au_ftest_opts(opts.flags, REFRESH_NONDIR)) | |
20574 | + au_remount_refresh(sb, opts.flags); | |
20575 | + | |
4a4d8108 AM |
20576 | + if (au_ftest_opts(opts.flags, REFRESH_DYAOP)) { |
20577 | + mntflags = au_mntflags(sb); | |
20578 | + do_dx = !!au_opt_test(mntflags, DIO); | |
20579 | + au_dy_arefresh(do_dx); | |
20580 | + } | |
20581 | + | |
1facf9fc | 20582 | + aufs_write_unlock(root); |
4f0767ce | 20583 | + mutex_unlock(&inode->i_mutex); |
953406b4 | 20584 | + |
4f0767ce | 20585 | +out_opts: |
1facf9fc | 20586 | + free_page((unsigned long)opts.opt); |
4f0767ce | 20587 | +out: |
1facf9fc | 20588 | + err = cvt_err(err); |
20589 | + AuTraceErr(err); | |
20590 | + return err; | |
20591 | +} | |
20592 | + | |
4a4d8108 | 20593 | +static const struct super_operations aufs_sop = { |
1facf9fc | 20594 | + .alloc_inode = aufs_alloc_inode, |
20595 | + .destroy_inode = aufs_destroy_inode, | |
b752ccd1 | 20596 | + /* always deleting, no clearing */ |
1facf9fc | 20597 | + .drop_inode = generic_delete_inode, |
20598 | + .show_options = aufs_show_options, | |
20599 | + .statfs = aufs_statfs, | |
20600 | + .put_super = aufs_put_super, | |
20601 | + .remount_fs = aufs_remount_fs | |
20602 | +}; | |
20603 | + | |
20604 | +/* ---------------------------------------------------------------------- */ | |
20605 | + | |
20606 | +static int alloc_root(struct super_block *sb) | |
20607 | +{ | |
20608 | + int err; | |
20609 | + struct inode *inode; | |
20610 | + struct dentry *root; | |
20611 | + | |
20612 | + err = -ENOMEM; | |
20613 | + inode = au_iget_locked(sb, AUFS_ROOT_INO); | |
20614 | + err = PTR_ERR(inode); | |
20615 | + if (IS_ERR(inode)) | |
20616 | + goto out; | |
20617 | + | |
20618 | + inode->i_op = &aufs_dir_iop; | |
20619 | + inode->i_fop = &aufs_dir_fop; | |
20620 | + inode->i_mode = S_IFDIR; | |
20621 | + inode->i_nlink = 2; | |
20622 | + unlock_new_inode(inode); | |
20623 | + | |
20624 | + root = d_alloc_root(inode); | |
20625 | + if (unlikely(!root)) | |
20626 | + goto out_iput; | |
20627 | + err = PTR_ERR(root); | |
20628 | + if (IS_ERR(root)) | |
20629 | + goto out_iput; | |
20630 | + | |
4a4d8108 | 20631 | + err = au_di_init(root); |
1facf9fc | 20632 | + if (!err) { |
20633 | + sb->s_root = root; | |
20634 | + return 0; /* success */ | |
20635 | + } | |
20636 | + dput(root); | |
20637 | + goto out; /* do not iput */ | |
20638 | + | |
4f0767ce | 20639 | +out_iput: |
1facf9fc | 20640 | + iget_failed(inode); |
953406b4 | 20641 | + iput(inode); |
4f0767ce | 20642 | +out: |
1facf9fc | 20643 | + return err; |
20644 | + | |
20645 | +} | |
20646 | + | |
20647 | +static int aufs_fill_super(struct super_block *sb, void *raw_data, | |
20648 | + int silent __maybe_unused) | |
20649 | +{ | |
20650 | + int err; | |
20651 | + struct au_opts opts; | |
20652 | + struct dentry *root; | |
20653 | + struct inode *inode; | |
20654 | + char *arg = raw_data; | |
20655 | + | |
20656 | + if (unlikely(!arg || !*arg)) { | |
20657 | + err = -EINVAL; | |
4a4d8108 | 20658 | + pr_err("no arg\n"); |
1facf9fc | 20659 | + goto out; |
20660 | + } | |
20661 | + | |
20662 | + err = -ENOMEM; | |
20663 | + memset(&opts, 0, sizeof(opts)); | |
20664 | + opts.opt = (void *)__get_free_page(GFP_NOFS); | |
20665 | + if (unlikely(!opts.opt)) | |
20666 | + goto out; | |
20667 | + opts.max_opt = PAGE_SIZE / sizeof(*opts.opt); | |
20668 | + opts.sb_flags = sb->s_flags; | |
20669 | + | |
20670 | + err = au_si_alloc(sb); | |
20671 | + if (unlikely(err)) | |
20672 | + goto out_opts; | |
20673 | + | |
20674 | + /* all timestamps always follow the ones on the branch */ | |
20675 | + sb->s_flags |= MS_NOATIME | MS_NODIRATIME; | |
20676 | + sb->s_op = &aufs_sop; | |
20677 | + sb->s_magic = AUFS_SUPER_MAGIC; | |
20678 | + sb->s_maxbytes = 0; | |
20679 | + au_export_init(sb); | |
20680 | + | |
20681 | + err = alloc_root(sb); | |
20682 | + if (unlikely(err)) { | |
20683 | + si_write_unlock(sb); | |
20684 | + goto out_info; | |
20685 | + } | |
20686 | + root = sb->s_root; | |
20687 | + inode = root->d_inode; | |
20688 | + | |
20689 | + /* | |
20690 | + * actually we can parse options regardless aufs lock here. | |
20691 | + * but at remount time, parsing must be done before aufs lock. | |
20692 | + * so we follow the same rule. | |
20693 | + */ | |
20694 | + ii_write_lock_parent(inode); | |
20695 | + aufs_write_unlock(root); | |
20696 | + err = au_opts_parse(sb, arg, &opts); | |
20697 | + if (unlikely(err)) | |
20698 | + goto out_root; | |
20699 | + | |
20700 | + /* lock vfs_inode first, then aufs. */ | |
20701 | + mutex_lock(&inode->i_mutex); | |
1facf9fc | 20702 | + aufs_write_lock(root); |
20703 | + err = au_opts_mount(sb, &opts); | |
20704 | + au_opts_free(&opts); | |
1facf9fc | 20705 | + aufs_write_unlock(root); |
20706 | + mutex_unlock(&inode->i_mutex); | |
4a4d8108 AM |
20707 | + if (!err) |
20708 | + goto out_opts; /* success */ | |
1facf9fc | 20709 | + |
4f0767ce | 20710 | +out_root: |
1facf9fc | 20711 | + dput(root); |
20712 | + sb->s_root = NULL; | |
4f0767ce | 20713 | +out_info: |
1facf9fc | 20714 | + kobject_put(&au_sbi(sb)->si_kobj); |
20715 | + sb->s_fs_info = NULL; | |
4f0767ce | 20716 | +out_opts: |
1facf9fc | 20717 | + free_page((unsigned long)opts.opt); |
4f0767ce | 20718 | +out: |
1facf9fc | 20719 | + AuTraceErr(err); |
20720 | + err = cvt_err(err); | |
20721 | + AuTraceErr(err); | |
20722 | + return err; | |
20723 | +} | |
20724 | + | |
20725 | +/* ---------------------------------------------------------------------- */ | |
20726 | + | |
20727 | +static int aufs_get_sb(struct file_system_type *fs_type, int flags, | |
20728 | + const char *dev_name __maybe_unused, void *raw_data, | |
20729 | + struct vfsmount *mnt) | |
20730 | +{ | |
20731 | + int err; | |
20732 | + struct super_block *sb; | |
20733 | + | |
20734 | + /* all timestamps always follow the ones on the branch */ | |
20735 | + /* mnt->mnt_flags |= MNT_NOATIME | MNT_NODIRATIME; */ | |
20736 | + err = get_sb_nodev(fs_type, flags, raw_data, aufs_fill_super, mnt); | |
20737 | + if (!err) { | |
20738 | + sb = mnt->mnt_sb; | |
953406b4 | 20739 | + si_write_lock(sb); |
1facf9fc | 20740 | + sysaufs_brs_add(sb, 0); |
20741 | + si_write_unlock(sb); | |
20742 | + } | |
20743 | + return err; | |
20744 | +} | |
20745 | + | |
20746 | +struct file_system_type aufs_fs_type = { | |
20747 | + .name = AUFS_FSTYPE, | |
20748 | + .fs_flags = | |
20749 | + FS_RENAME_DOES_D_MOVE /* a race between rename and others */ | |
20750 | + | FS_REVAL_DOT, /* for NFS branch and udba */ | |
20751 | + .get_sb = aufs_get_sb, | |
953406b4 | 20752 | + .kill_sb = generic_shutdown_super, |
1facf9fc | 20753 | + /* no need to __module_get() and module_put(). */ |
20754 | + .owner = THIS_MODULE, | |
20755 | +}; | |
b752ccd1 AM |
20756 | diff -urN /usr/share/empty/fs/aufs/super.h linux/fs/aufs/super.h |
20757 | --- /usr/share/empty/fs/aufs/super.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
20758 | +++ linux/fs/aufs/super.h 2010-10-21 09:52:43.093625591 +0200 |
20759 | @@ -0,0 +1,465 @@ | |
1facf9fc | 20760 | +/* |
4a4d8108 | 20761 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 20762 | + * |
20763 | + * This program, aufs is free software; you can redistribute it and/or modify | |
20764 | + * it under the terms of the GNU General Public License as published by | |
20765 | + * the Free Software Foundation; either version 2 of the License, or | |
20766 | + * (at your option) any later version. | |
dece6358 AM |
20767 | + * |
20768 | + * This program is distributed in the hope that it will be useful, | |
20769 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20770 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20771 | + * GNU General Public License for more details. | |
20772 | + * | |
20773 | + * You should have received a copy of the GNU General Public License | |
20774 | + * along with this program; if not, write to the Free Software | |
20775 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 20776 | + */ |
20777 | + | |
20778 | +/* | |
20779 | + * super_block operations | |
20780 | + */ | |
20781 | + | |
20782 | +#ifndef __AUFS_SUPER_H__ | |
20783 | +#define __AUFS_SUPER_H__ | |
20784 | + | |
20785 | +#ifdef __KERNEL__ | |
20786 | + | |
20787 | +#include <linux/fs.h> | |
1facf9fc | 20788 | +#include <linux/aufs_type.h> |
20789 | +#include "rwsem.h" | |
20790 | +#include "spl.h" | |
20791 | +#include "wkq.h" | |
20792 | + | |
20793 | +typedef ssize_t (*au_readf_t)(struct file *, char __user *, size_t, loff_t *); | |
20794 | +typedef ssize_t (*au_writef_t)(struct file *, const char __user *, size_t, | |
20795 | + loff_t *); | |
20796 | + | |
20797 | +/* policies to select one among multiple writable branches */ | |
20798 | +struct au_wbr_copyup_operations { | |
20799 | + int (*copyup)(struct dentry *dentry); | |
20800 | +}; | |
20801 | + | |
20802 | +struct au_wbr_create_operations { | |
20803 | + int (*create)(struct dentry *dentry, int isdir); | |
20804 | + int (*init)(struct super_block *sb); | |
20805 | + int (*fin)(struct super_block *sb); | |
20806 | +}; | |
20807 | + | |
20808 | +struct au_wbr_mfs { | |
20809 | + struct mutex mfs_lock; /* protect this structure */ | |
20810 | + unsigned long mfs_jiffy; | |
20811 | + unsigned long mfs_expire; | |
20812 | + aufs_bindex_t mfs_bindex; | |
20813 | + | |
20814 | + unsigned long long mfsrr_bytes; | |
20815 | + unsigned long long mfsrr_watermark; | |
20816 | +}; | |
20817 | + | |
1facf9fc | 20818 | +struct au_branch; |
20819 | +struct au_sbinfo { | |
20820 | + /* nowait tasks in the system-wide workqueue */ | |
20821 | + struct au_nowait_tasks si_nowait; | |
20822 | + | |
b752ccd1 AM |
20823 | + /* |
20824 | + * tried sb->s_umount, but failed due to the dependecy between i_mutex. | |
20825 | + * rwsem for au_sbinfo is necessary. | |
20826 | + */ | |
dece6358 | 20827 | + struct au_rwsem si_rwsem; |
1facf9fc | 20828 | + |
b752ccd1 AM |
20829 | + /* prevent recursive locking in deleting inode */ |
20830 | + struct { | |
20831 | + unsigned long *bitmap; | |
20832 | + spinlock_t tree_lock; | |
20833 | + struct radix_tree_root tree; | |
20834 | + } au_si_pid; | |
20835 | + | |
1facf9fc | 20836 | + /* branch management */ |
20837 | + unsigned int si_generation; | |
20838 | + | |
20839 | + /* see above flags */ | |
20840 | + unsigned char au_si_status; | |
20841 | + | |
20842 | + aufs_bindex_t si_bend; | |
20843 | + aufs_bindex_t si_last_br_id; | |
20844 | + struct au_branch **si_branch; | |
20845 | + | |
20846 | + /* policy to select a writable branch */ | |
20847 | + unsigned char si_wbr_copyup; | |
20848 | + unsigned char si_wbr_create; | |
20849 | + struct au_wbr_copyup_operations *si_wbr_copyup_ops; | |
20850 | + struct au_wbr_create_operations *si_wbr_create_ops; | |
20851 | + | |
20852 | + /* round robin */ | |
20853 | + atomic_t si_wbr_rr_next; | |
20854 | + | |
20855 | + /* most free space */ | |
20856 | + struct au_wbr_mfs si_wbr_mfs; | |
20857 | + | |
20858 | + /* mount flags */ | |
20859 | + /* include/asm-ia64/siginfo.h defines a macro named si_flags */ | |
20860 | + unsigned int si_mntflags; | |
20861 | + | |
20862 | + /* external inode number (bitmap and translation table) */ | |
20863 | + au_readf_t si_xread; | |
20864 | + au_writef_t si_xwrite; | |
20865 | + struct file *si_xib; | |
20866 | + struct mutex si_xib_mtx; /* protect xib members */ | |
20867 | + unsigned long *si_xib_buf; | |
20868 | + unsigned long si_xib_last_pindex; | |
20869 | + int si_xib_next_bit; | |
20870 | + aufs_bindex_t si_xino_brid; | |
20871 | + /* reserved for future use */ | |
20872 | + /* unsigned long long si_xib_limit; */ /* Max xib file size */ | |
20873 | + | |
20874 | +#ifdef CONFIG_AUFS_EXPORT | |
20875 | + /* i_generation */ | |
20876 | + struct file *si_xigen; | |
20877 | + atomic_t si_xigen_next; | |
20878 | +#endif | |
20879 | + | |
20880 | + /* vdir parameters */ | |
953406b4 | 20881 | + unsigned long si_rdcache; /* max cache time in HZ */ |
1facf9fc | 20882 | + unsigned int si_rdblk; /* deblk size */ |
20883 | + unsigned int si_rdhash; /* hash size */ | |
20884 | + | |
20885 | + /* | |
20886 | + * If the number of whiteouts are larger than si_dirwh, leave all of | |
20887 | + * them after au_whtmp_ren to reduce the cost of rmdir(2). | |
20888 | + * future fsck.aufs or kernel thread will remove them later. | |
20889 | + * Otherwise, remove all whiteouts and the dir in rmdir(2). | |
20890 | + */ | |
20891 | + unsigned int si_dirwh; | |
20892 | + | |
20893 | + /* | |
20894 | + * rename(2) a directory with all children. | |
20895 | + */ | |
20896 | + /* reserved for future use */ | |
20897 | + /* int si_rendir; */ | |
20898 | + | |
20899 | + /* pseudo_link list */ | |
20900 | + struct au_splhead si_plink; | |
20901 | + wait_queue_head_t si_plink_wq; | |
4a4d8108 | 20902 | + spinlock_t si_plink_maint_lock; |
953406b4 | 20903 | + struct file *si_plink_maint; |
1facf9fc | 20904 | + |
20905 | + /* | |
20906 | + * sysfs and lifetime management. | |
20907 | + * this is not a small structure and it may be a waste of memory in case | |
20908 | + * of sysfs is disabled, particulary when many aufs-es are mounted. | |
20909 | + * but using sysfs is majority. | |
20910 | + */ | |
20911 | + struct kobject si_kobj; | |
20912 | +#ifdef CONFIG_DEBUG_FS | |
20913 | + struct dentry *si_dbgaufs, *si_dbgaufs_xib; | |
20914 | +#ifdef CONFIG_AUFS_EXPORT | |
20915 | + struct dentry *si_dbgaufs_xigen; | |
20916 | +#endif | |
20917 | +#endif | |
20918 | + | |
20919 | + /* dirty, necessary for unmounting, sysfs and sysrq */ | |
20920 | + struct super_block *si_sb; | |
20921 | +}; | |
20922 | + | |
dece6358 AM |
20923 | +/* sbinfo status flags */ |
20924 | +/* | |
20925 | + * set true when refresh_dirs() failed at remount time. | |
20926 | + * then try refreshing dirs at access time again. | |
20927 | + * if it is false, refreshing dirs at access time is unnecesary | |
20928 | + */ | |
20929 | +#define AuSi_FAILED_REFRESH_DIRS 1 | |
dece6358 AM |
20930 | +static inline unsigned char au_do_ftest_si(struct au_sbinfo *sbi, |
20931 | + unsigned int flag) | |
20932 | +{ | |
20933 | + AuRwMustAnyLock(&sbi->si_rwsem); | |
20934 | + return sbi->au_si_status & flag; | |
20935 | +} | |
20936 | +#define au_ftest_si(sbinfo, name) au_do_ftest_si(sbinfo, AuSi_##name) | |
20937 | +#define au_fset_si(sbinfo, name) do { \ | |
20938 | + AuRwMustWriteLock(&(sbinfo)->si_rwsem); \ | |
20939 | + (sbinfo)->au_si_status |= AuSi_##name; \ | |
20940 | +} while (0) | |
20941 | +#define au_fclr_si(sbinfo, name) do { \ | |
20942 | + AuRwMustWriteLock(&(sbinfo)->si_rwsem); \ | |
20943 | + (sbinfo)->au_si_status &= ~AuSi_##name; \ | |
20944 | +} while (0) | |
20945 | + | |
1facf9fc | 20946 | +/* ---------------------------------------------------------------------- */ |
20947 | + | |
20948 | +/* policy to select one among writable branches */ | |
4a4d8108 AM |
20949 | +#define AuWbrCopyup(sbinfo, ...) \ |
20950 | + ((sbinfo)->si_wbr_copyup_ops->copyup(__VA_ARGS__)) | |
20951 | +#define AuWbrCreate(sbinfo, ...) \ | |
20952 | + ((sbinfo)->si_wbr_create_ops->create(__VA_ARGS__)) | |
1facf9fc | 20953 | + |
20954 | +/* flags for si_read_lock()/aufs_read_lock()/di_read_lock() */ | |
20955 | +#define AuLock_DW 1 /* write-lock dentry */ | |
20956 | +#define AuLock_IR (1 << 1) /* read-lock inode */ | |
20957 | +#define AuLock_IW (1 << 2) /* write-lock inode */ | |
20958 | +#define AuLock_FLUSH (1 << 3) /* wait for 'nowait' tasks */ | |
20959 | +#define AuLock_DIR (1 << 4) /* target is a dir */ | |
20960 | +#define au_ftest_lock(flags, name) ((flags) & AuLock_##name) | |
20961 | +#define au_fset_lock(flags, name) { (flags) |= AuLock_##name; } | |
20962 | +#define au_fclr_lock(flags, name) { (flags) &= ~AuLock_##name; } | |
20963 | + | |
20964 | +/* ---------------------------------------------------------------------- */ | |
20965 | + | |
20966 | +/* super.c */ | |
20967 | +extern struct file_system_type aufs_fs_type; | |
20968 | +struct inode *au_iget_locked(struct super_block *sb, ino_t ino); | |
20969 | + | |
20970 | +/* sbinfo.c */ | |
20971 | +void au_si_free(struct kobject *kobj); | |
20972 | +int au_si_alloc(struct super_block *sb); | |
20973 | +int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr); | |
20974 | + | |
20975 | +unsigned int au_sigen_inc(struct super_block *sb); | |
20976 | +aufs_bindex_t au_new_br_id(struct super_block *sb); | |
20977 | + | |
953406b4 | 20978 | +void aufs_read_lock(struct dentry *dentry, int flags); |
1facf9fc | 20979 | +void aufs_read_unlock(struct dentry *dentry, int flags); |
20980 | +void aufs_write_lock(struct dentry *dentry); | |
20981 | +void aufs_write_unlock(struct dentry *dentry); | |
953406b4 | 20982 | +void aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int isdir); |
1facf9fc | 20983 | +void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2); |
20984 | + | |
b752ccd1 AM |
20985 | +int si_pid_test_slow(struct super_block *sb); |
20986 | +void si_pid_set_slow(struct super_block *sb); | |
20987 | +void si_pid_clr_slow(struct super_block *sb); | |
20988 | + | |
1facf9fc | 20989 | +/* wbr_policy.c */ |
20990 | +extern struct au_wbr_copyup_operations au_wbr_copyup_ops[]; | |
20991 | +extern struct au_wbr_create_operations au_wbr_create_ops[]; | |
20992 | +int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst); | |
20993 | + | |
20994 | +/* ---------------------------------------------------------------------- */ | |
20995 | + | |
20996 | +static inline struct au_sbinfo *au_sbi(struct super_block *sb) | |
20997 | +{ | |
20998 | + return sb->s_fs_info; | |
20999 | +} | |
21000 | + | |
21001 | +/* ---------------------------------------------------------------------- */ | |
21002 | + | |
21003 | +#ifdef CONFIG_AUFS_EXPORT | |
21004 | +void au_export_init(struct super_block *sb); | |
21005 | + | |
b752ccd1 | 21006 | +static inline int au_test_nfsd(void) |
1facf9fc | 21007 | +{ |
b752ccd1 AM |
21008 | + struct task_struct *tsk = current; |
21009 | + | |
21010 | + return (tsk->flags & PF_KTHREAD) | |
21011 | + && !strcmp(tsk->comm, "nfsd"); | |
1facf9fc | 21012 | +} |
21013 | + | |
b752ccd1 | 21014 | +void au_xigen_inc(struct inode *inode); |
1facf9fc | 21015 | +int au_xigen_new(struct inode *inode); |
21016 | +int au_xigen_set(struct super_block *sb, struct file *base); | |
21017 | +void au_xigen_clr(struct super_block *sb); | |
21018 | + | |
21019 | +static inline int au_busy_or_stale(void) | |
21020 | +{ | |
b752ccd1 | 21021 | + if (!au_test_nfsd()) |
1facf9fc | 21022 | + return -EBUSY; |
21023 | + return -ESTALE; | |
21024 | +} | |
21025 | +#else | |
4a4d8108 | 21026 | +AuStubVoid(au_export_init, struct super_block *sb) |
b752ccd1 AM |
21027 | +AuStubInt0(au_test_nfsd, void) |
21028 | +AuStubVoid(au_xigen_inc, struct inode *inode) | |
4a4d8108 AM |
21029 | +AuStubInt0(au_xigen_new, struct inode *inode) |
21030 | +AuStubInt0(au_xigen_set, struct super_block *sb, struct file *base) | |
21031 | +AuStubVoid(au_xigen_clr, struct super_block *sb) | |
1facf9fc | 21032 | +static inline int au_busy_or_stale(void) |
21033 | +{ | |
21034 | + return -EBUSY; | |
21035 | +} | |
21036 | +#endif /* CONFIG_AUFS_EXPORT */ | |
21037 | + | |
21038 | +/* ---------------------------------------------------------------------- */ | |
21039 | + | |
21040 | +static inline void dbgaufs_si_null(struct au_sbinfo *sbinfo) | |
21041 | +{ | |
dece6358 AM |
21042 | + /* |
21043 | + * This function is a dynamic '__init' fucntion actually, | |
21044 | + * so the tiny check for si_rwsem is unnecessary. | |
21045 | + */ | |
21046 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
1facf9fc | 21047 | +#ifdef CONFIG_DEBUG_FS |
21048 | + sbinfo->si_dbgaufs = NULL; | |
21049 | + sbinfo->si_dbgaufs_xib = NULL; | |
21050 | +#ifdef CONFIG_AUFS_EXPORT | |
21051 | + sbinfo->si_dbgaufs_xigen = NULL; | |
21052 | +#endif | |
21053 | +#endif | |
21054 | +} | |
21055 | + | |
21056 | +/* ---------------------------------------------------------------------- */ | |
21057 | + | |
b752ccd1 AM |
21058 | +static inline pid_t si_pid_bit(void) |
21059 | +{ | |
21060 | + /* the origin of pid is 1, but the bitmap's is 0 */ | |
21061 | + return current->pid - 1; | |
21062 | +} | |
21063 | + | |
21064 | +static inline int si_pid_test(struct super_block *sb) | |
21065 | +{ | |
21066 | + pid_t bit = si_pid_bit(); | |
21067 | + if (bit < PID_MAX_DEFAULT) | |
21068 | + return test_bit(bit, au_sbi(sb)->au_si_pid.bitmap); | |
21069 | + else | |
21070 | + return si_pid_test_slow(sb); | |
21071 | +} | |
21072 | + | |
21073 | +static inline void si_pid_set(struct super_block *sb) | |
21074 | +{ | |
21075 | + pid_t bit = si_pid_bit(); | |
21076 | + if (bit < PID_MAX_DEFAULT) { | |
21077 | + AuDebugOn(test_bit(bit, au_sbi(sb)->au_si_pid.bitmap)); | |
21078 | + set_bit(bit, au_sbi(sb)->au_si_pid.bitmap); | |
21079 | + /* smp_mb(); */ | |
21080 | + } else | |
21081 | + si_pid_set_slow(sb); | |
21082 | +} | |
21083 | + | |
21084 | +static inline void si_pid_clr(struct super_block *sb) | |
21085 | +{ | |
21086 | + pid_t bit = si_pid_bit(); | |
21087 | + if (bit < PID_MAX_DEFAULT) { | |
21088 | + AuDebugOn(!test_bit(bit, au_sbi(sb)->au_si_pid.bitmap)); | |
21089 | + clear_bit(bit, au_sbi(sb)->au_si_pid.bitmap); | |
21090 | + /* smp_mb(); */ | |
21091 | + } else | |
21092 | + si_pid_clr_slow(sb); | |
21093 | +} | |
21094 | + | |
21095 | +/* ---------------------------------------------------------------------- */ | |
21096 | + | |
1facf9fc | 21097 | +/* lock superblock. mainly for entry point functions */ |
21098 | +/* | |
b752ccd1 AM |
21099 | + * __si_read_lock, __si_write_lock, |
21100 | + * __si_read_unlock, __si_write_unlock, __si_downgrade_lock | |
1facf9fc | 21101 | + */ |
b752ccd1 | 21102 | +AuSimpleRwsemFuncs(__si, struct super_block *sb, &au_sbi(sb)->si_rwsem); |
1facf9fc | 21103 | + |
dece6358 AM |
21104 | +#define SiMustNoWaiters(sb) AuRwMustNoWaiters(&au_sbi(sb)->si_rwsem) |
21105 | +#define SiMustAnyLock(sb) AuRwMustAnyLock(&au_sbi(sb)->si_rwsem) | |
21106 | +#define SiMustWriteLock(sb) AuRwMustWriteLock(&au_sbi(sb)->si_rwsem) | |
21107 | + | |
b752ccd1 AM |
21108 | +static inline void si_noflush_read_lock(struct super_block *sb) |
21109 | +{ | |
21110 | + __si_read_lock(sb); | |
21111 | + si_pid_set(sb); | |
21112 | +} | |
21113 | + | |
21114 | +static inline int si_noflush_read_trylock(struct super_block *sb) | |
21115 | +{ | |
21116 | + int locked = __si_read_trylock(sb); | |
21117 | + if (locked) | |
21118 | + si_pid_set(sb); | |
21119 | + return locked; | |
21120 | +} | |
21121 | + | |
21122 | +static inline void si_noflush_write_lock(struct super_block *sb) | |
21123 | +{ | |
21124 | + __si_write_lock(sb); | |
21125 | + si_pid_set(sb); | |
21126 | +} | |
21127 | + | |
21128 | +static inline int si_noflush_write_trylock(struct super_block *sb) | |
21129 | +{ | |
21130 | + int locked = __si_write_trylock(sb); | |
21131 | + if (locked) | |
21132 | + si_pid_set(sb); | |
21133 | + return locked; | |
21134 | +} | |
21135 | + | |
953406b4 AM |
21136 | +static inline void si_read_lock(struct super_block *sb, int flags) |
21137 | +{ | |
21138 | + if (au_ftest_lock(flags, FLUSH)) | |
21139 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
21140 | + si_noflush_read_lock(sb); | |
21141 | +} | |
21142 | + | |
1facf9fc | 21143 | +static inline int si_read_trylock(struct super_block *sb, int flags) |
21144 | +{ | |
21145 | + if (au_ftest_lock(flags, FLUSH)) | |
21146 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
21147 | + return si_noflush_read_trylock(sb); | |
21148 | +} | |
21149 | + | |
b752ccd1 AM |
21150 | +static inline void si_read_unlock(struct super_block *sb) |
21151 | +{ | |
21152 | + si_pid_clr(sb); | |
21153 | + __si_read_unlock(sb); | |
21154 | +} | |
21155 | + | |
953406b4 AM |
21156 | +static inline void si_write_lock(struct super_block *sb) |
21157 | +{ | |
21158 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
21159 | + si_noflush_write_lock(sb); | |
21160 | +} | |
21161 | + | |
b752ccd1 | 21162 | +#if 0 /* unused */ |
1facf9fc | 21163 | +static inline int si_write_trylock(struct super_block *sb, int flags) |
21164 | +{ | |
21165 | + if (au_ftest_lock(flags, FLUSH)) | |
21166 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
21167 | + return si_noflush_write_trylock(sb); | |
21168 | +} | |
b752ccd1 AM |
21169 | +#endif |
21170 | + | |
21171 | +static inline void si_write_unlock(struct super_block *sb) | |
21172 | +{ | |
21173 | + si_pid_clr(sb); | |
21174 | + __si_write_unlock(sb); | |
21175 | +} | |
21176 | + | |
21177 | +#if 0 /* unused */ | |
21178 | +static inline void si_downgrade_lock(struct super_block *sb) | |
21179 | +{ | |
21180 | + __si_downgrade_lock(sb); | |
21181 | +} | |
21182 | +#endif | |
1facf9fc | 21183 | + |
21184 | +/* ---------------------------------------------------------------------- */ | |
21185 | + | |
21186 | +static inline aufs_bindex_t au_sbend(struct super_block *sb) | |
21187 | +{ | |
dece6358 | 21188 | + SiMustAnyLock(sb); |
1facf9fc | 21189 | + return au_sbi(sb)->si_bend; |
21190 | +} | |
21191 | + | |
21192 | +static inline unsigned int au_mntflags(struct super_block *sb) | |
21193 | +{ | |
dece6358 | 21194 | + SiMustAnyLock(sb); |
1facf9fc | 21195 | + return au_sbi(sb)->si_mntflags; |
21196 | +} | |
21197 | + | |
21198 | +static inline unsigned int au_sigen(struct super_block *sb) | |
21199 | +{ | |
dece6358 | 21200 | + SiMustAnyLock(sb); |
1facf9fc | 21201 | + return au_sbi(sb)->si_generation; |
21202 | +} | |
21203 | + | |
21204 | +static inline struct au_branch *au_sbr(struct super_block *sb, | |
21205 | + aufs_bindex_t bindex) | |
21206 | +{ | |
dece6358 | 21207 | + SiMustAnyLock(sb); |
1facf9fc | 21208 | + return au_sbi(sb)->si_branch[0 + bindex]; |
21209 | +} | |
21210 | + | |
21211 | +static inline void au_xino_brid_set(struct super_block *sb, aufs_bindex_t brid) | |
21212 | +{ | |
dece6358 | 21213 | + SiMustWriteLock(sb); |
1facf9fc | 21214 | + au_sbi(sb)->si_xino_brid = brid; |
21215 | +} | |
21216 | + | |
21217 | +static inline aufs_bindex_t au_xino_brid(struct super_block *sb) | |
21218 | +{ | |
dece6358 | 21219 | + SiMustAnyLock(sb); |
1facf9fc | 21220 | + return au_sbi(sb)->si_xino_brid; |
21221 | +} | |
21222 | + | |
21223 | +#endif /* __KERNEL__ */ | |
21224 | +#endif /* __AUFS_SUPER_H__ */ | |
b752ccd1 AM |
21225 | diff -urN /usr/share/empty/fs/aufs/sysaufs.c linux/fs/aufs/sysaufs.c |
21226 | --- /usr/share/empty/fs/aufs/sysaufs.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 21227 | +++ linux/fs/aufs/sysaufs.c 2010-10-21 09:52:43.093625591 +0200 |
4a4d8108 | 21228 | @@ -0,0 +1,107 @@ |
1facf9fc | 21229 | +/* |
4a4d8108 | 21230 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 21231 | + * |
21232 | + * This program, aufs is free software; you can redistribute it and/or modify | |
21233 | + * it under the terms of the GNU General Public License as published by | |
21234 | + * the Free Software Foundation; either version 2 of the License, or | |
21235 | + * (at your option) any later version. | |
dece6358 AM |
21236 | + * |
21237 | + * This program is distributed in the hope that it will be useful, | |
21238 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21239 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21240 | + * GNU General Public License for more details. | |
21241 | + * | |
21242 | + * You should have received a copy of the GNU General Public License | |
21243 | + * along with this program; if not, write to the Free Software | |
21244 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 21245 | + */ |
21246 | + | |
21247 | +/* | |
21248 | + * sysfs interface and lifetime management | |
21249 | + * they are necessary regardless sysfs is disabled. | |
21250 | + */ | |
21251 | + | |
21252 | +#include <linux/fs.h> | |
21253 | +#include <linux/random.h> | |
21254 | +#include <linux/sysfs.h> | |
21255 | +#include "aufs.h" | |
21256 | + | |
21257 | +unsigned long sysaufs_si_mask; | |
953406b4 | 21258 | +struct kset *sysaufs_ket; |
1facf9fc | 21259 | + |
21260 | +#define AuSiAttr(_name) { \ | |
21261 | + .attr = { .name = __stringify(_name), .mode = 0444 }, \ | |
21262 | + .show = sysaufs_si_##_name, \ | |
21263 | +} | |
21264 | + | |
21265 | +static struct sysaufs_si_attr sysaufs_si_attr_xi_path = AuSiAttr(xi_path); | |
21266 | +struct attribute *sysaufs_si_attrs[] = { | |
21267 | + &sysaufs_si_attr_xi_path.attr, | |
21268 | + NULL, | |
21269 | +}; | |
21270 | + | |
4a4d8108 | 21271 | +static const struct sysfs_ops au_sbi_ops = { |
1facf9fc | 21272 | + .show = sysaufs_si_show |
21273 | +}; | |
21274 | + | |
21275 | +static struct kobj_type au_sbi_ktype = { | |
21276 | + .release = au_si_free, | |
21277 | + .sysfs_ops = &au_sbi_ops, | |
21278 | + .default_attrs = sysaufs_si_attrs | |
21279 | +}; | |
21280 | + | |
21281 | +/* ---------------------------------------------------------------------- */ | |
21282 | + | |
21283 | +int sysaufs_si_init(struct au_sbinfo *sbinfo) | |
21284 | +{ | |
21285 | + int err; | |
21286 | + | |
953406b4 | 21287 | + sbinfo->si_kobj.kset = sysaufs_ket; |
1facf9fc | 21288 | + /* cf. sysaufs_name() */ |
21289 | + err = kobject_init_and_add | |
953406b4 | 21290 | + (&sbinfo->si_kobj, &au_sbi_ktype, /*&sysaufs_ket->kobj*/NULL, |
1facf9fc | 21291 | + SysaufsSiNamePrefix "%lx", sysaufs_si_id(sbinfo)); |
21292 | + | |
21293 | + dbgaufs_si_null(sbinfo); | |
21294 | + if (!err) { | |
21295 | + err = dbgaufs_si_init(sbinfo); | |
21296 | + if (unlikely(err)) | |
21297 | + kobject_put(&sbinfo->si_kobj); | |
21298 | + } | |
21299 | + return err; | |
21300 | +} | |
21301 | + | |
21302 | +void sysaufs_fin(void) | |
21303 | +{ | |
21304 | + dbgaufs_fin(); | |
953406b4 AM |
21305 | + sysfs_remove_group(&sysaufs_ket->kobj, sysaufs_attr_group); |
21306 | + kset_unregister(sysaufs_ket); | |
1facf9fc | 21307 | +} |
21308 | + | |
21309 | +int __init sysaufs_init(void) | |
21310 | +{ | |
21311 | + int err; | |
21312 | + | |
21313 | + do { | |
21314 | + get_random_bytes(&sysaufs_si_mask, sizeof(sysaufs_si_mask)); | |
21315 | + } while (!sysaufs_si_mask); | |
21316 | + | |
4a4d8108 | 21317 | + err = -EINVAL; |
953406b4 AM |
21318 | + sysaufs_ket = kset_create_and_add(AUFS_NAME, NULL, fs_kobj); |
21319 | + if (unlikely(!sysaufs_ket)) | |
4a4d8108 | 21320 | + goto out; |
953406b4 AM |
21321 | + err = PTR_ERR(sysaufs_ket); |
21322 | + if (IS_ERR(sysaufs_ket)) | |
1facf9fc | 21323 | + goto out; |
953406b4 | 21324 | + err = sysfs_create_group(&sysaufs_ket->kobj, sysaufs_attr_group); |
1facf9fc | 21325 | + if (unlikely(err)) { |
953406b4 | 21326 | + kset_unregister(sysaufs_ket); |
1facf9fc | 21327 | + goto out; |
21328 | + } | |
21329 | + | |
21330 | + err = dbgaufs_init(); | |
21331 | + if (unlikely(err)) | |
21332 | + sysaufs_fin(); | |
4f0767ce | 21333 | +out: |
1facf9fc | 21334 | + return err; |
21335 | +} | |
b752ccd1 AM |
21336 | diff -urN /usr/share/empty/fs/aufs/sysaufs.h linux/fs/aufs/sysaufs.h |
21337 | --- /usr/share/empty/fs/aufs/sysaufs.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 21338 | +++ linux/fs/aufs/sysaufs.h 2010-10-21 09:52:43.093625591 +0200 |
4a4d8108 | 21339 | @@ -0,0 +1,105 @@ |
1facf9fc | 21340 | +/* |
4a4d8108 | 21341 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 21342 | + * |
21343 | + * This program, aufs is free software; you can redistribute it and/or modify | |
21344 | + * it under the terms of the GNU General Public License as published by | |
21345 | + * the Free Software Foundation; either version 2 of the License, or | |
21346 | + * (at your option) any later version. | |
dece6358 AM |
21347 | + * |
21348 | + * This program is distributed in the hope that it will be useful, | |
21349 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21350 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21351 | + * GNU General Public License for more details. | |
21352 | + * | |
21353 | + * You should have received a copy of the GNU General Public License | |
21354 | + * along with this program; if not, write to the Free Software | |
21355 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 21356 | + */ |
21357 | + | |
21358 | +/* | |
21359 | + * sysfs interface and mount lifetime management | |
21360 | + */ | |
21361 | + | |
21362 | +#ifndef __SYSAUFS_H__ | |
21363 | +#define __SYSAUFS_H__ | |
21364 | + | |
21365 | +#ifdef __KERNEL__ | |
21366 | + | |
1facf9fc | 21367 | +#include <linux/sysfs.h> |
21368 | +#include <linux/aufs_type.h> | |
21369 | +#include "module.h" | |
21370 | + | |
dece6358 AM |
21371 | +struct super_block; |
21372 | +struct au_sbinfo; | |
21373 | + | |
1facf9fc | 21374 | +struct sysaufs_si_attr { |
21375 | + struct attribute attr; | |
21376 | + int (*show)(struct seq_file *seq, struct super_block *sb); | |
21377 | +}; | |
21378 | + | |
21379 | +/* ---------------------------------------------------------------------- */ | |
21380 | + | |
21381 | +/* sysaufs.c */ | |
21382 | +extern unsigned long sysaufs_si_mask; | |
953406b4 | 21383 | +extern struct kset *sysaufs_ket; |
1facf9fc | 21384 | +extern struct attribute *sysaufs_si_attrs[]; |
21385 | +int sysaufs_si_init(struct au_sbinfo *sbinfo); | |
21386 | +int __init sysaufs_init(void); | |
21387 | +void sysaufs_fin(void); | |
21388 | + | |
21389 | +/* ---------------------------------------------------------------------- */ | |
21390 | + | |
21391 | +/* some people doesn't like to show a pointer in kernel */ | |
21392 | +static inline unsigned long sysaufs_si_id(struct au_sbinfo *sbinfo) | |
21393 | +{ | |
21394 | + return sysaufs_si_mask ^ (unsigned long)sbinfo; | |
21395 | +} | |
21396 | + | |
21397 | +#define SysaufsSiNamePrefix "si_" | |
21398 | +#define SysaufsSiNameLen (sizeof(SysaufsSiNamePrefix) + 16) | |
21399 | +static inline void sysaufs_name(struct au_sbinfo *sbinfo, char *name) | |
21400 | +{ | |
21401 | + snprintf(name, SysaufsSiNameLen, SysaufsSiNamePrefix "%lx", | |
21402 | + sysaufs_si_id(sbinfo)); | |
21403 | +} | |
21404 | + | |
21405 | +struct au_branch; | |
21406 | +#ifdef CONFIG_SYSFS | |
21407 | +/* sysfs.c */ | |
21408 | +extern struct attribute_group *sysaufs_attr_group; | |
21409 | + | |
21410 | +int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb); | |
21411 | +ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr, | |
21412 | + char *buf); | |
21413 | + | |
21414 | +void sysaufs_br_init(struct au_branch *br); | |
21415 | +void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex); | |
21416 | +void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex); | |
21417 | + | |
21418 | +#define sysaufs_brs_init() do {} while (0) | |
21419 | + | |
21420 | +#else | |
21421 | +#define sysaufs_attr_group NULL | |
21422 | + | |
4a4d8108 | 21423 | +AuStubInt0(sysaufs_si_xi_path, struct seq_file *seq, struct super_block *sb) |
1facf9fc | 21424 | + |
21425 | +static inline | |
21426 | +ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr, | |
21427 | + char *buf) | |
21428 | +{ | |
21429 | + return 0; | |
21430 | +} | |
21431 | + | |
4a4d8108 AM |
21432 | +AuStubVoid(sysaufs_br_init, struct au_branch *br) |
21433 | +AuStubVoid(sysaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex) | |
21434 | +AuStubVoid(sysaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex) | |
1facf9fc | 21435 | + |
21436 | +static inline void sysaufs_brs_init(void) | |
21437 | +{ | |
21438 | + sysaufs_brs = 0; | |
21439 | +} | |
21440 | + | |
21441 | +#endif /* CONFIG_SYSFS */ | |
21442 | + | |
21443 | +#endif /* __KERNEL__ */ | |
21444 | +#endif /* __SYSAUFS_H__ */ | |
b752ccd1 AM |
21445 | diff -urN /usr/share/empty/fs/aufs/sysfs.c linux/fs/aufs/sysfs.c |
21446 | --- /usr/share/empty/fs/aufs/sysfs.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
21447 | +++ linux/fs/aufs/sysfs.c 2010-10-21 09:52:43.093625591 +0200 |
21448 | @@ -0,0 +1,250 @@ | |
1facf9fc | 21449 | +/* |
4a4d8108 | 21450 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 21451 | + * |
21452 | + * This program, aufs is free software; you can redistribute it and/or modify | |
21453 | + * it under the terms of the GNU General Public License as published by | |
21454 | + * the Free Software Foundation; either version 2 of the License, or | |
21455 | + * (at your option) any later version. | |
dece6358 AM |
21456 | + * |
21457 | + * This program is distributed in the hope that it will be useful, | |
21458 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21459 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21460 | + * GNU General Public License for more details. | |
21461 | + * | |
21462 | + * You should have received a copy of the GNU General Public License | |
21463 | + * along with this program; if not, write to the Free Software | |
21464 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 21465 | + */ |
21466 | + | |
21467 | +/* | |
21468 | + * sysfs interface | |
21469 | + */ | |
21470 | + | |
21471 | +#include <linux/fs.h> | |
dece6358 | 21472 | +#include <linux/module.h> |
1facf9fc | 21473 | +#include <linux/seq_file.h> |
21474 | +#include <linux/sysfs.h> | |
21475 | +#include "aufs.h" | |
21476 | + | |
4a4d8108 AM |
21477 | +#ifdef CONFIG_AUFS_FS_MODULE |
21478 | +/* this entry violates the "one line per file" policy of sysfs */ | |
21479 | +static ssize_t config_show(struct kobject *kobj, struct kobj_attribute *attr, | |
21480 | + char *buf) | |
21481 | +{ | |
21482 | + ssize_t err; | |
21483 | + static char *conf = | |
21484 | +/* this file is generated at compiling */ | |
21485 | +#include "conf.str" | |
21486 | + ; | |
21487 | + | |
21488 | + err = snprintf(buf, PAGE_SIZE, conf); | |
21489 | + if (unlikely(err >= PAGE_SIZE)) | |
21490 | + err = -EFBIG; | |
21491 | + return err; | |
21492 | +} | |
21493 | + | |
21494 | +static struct kobj_attribute au_config_attr = __ATTR_RO(config); | |
21495 | +#endif | |
21496 | + | |
1facf9fc | 21497 | +static struct attribute *au_attr[] = { |
4a4d8108 AM |
21498 | +#ifdef CONFIG_AUFS_FS_MODULE |
21499 | + &au_config_attr.attr, | |
21500 | +#endif | |
1facf9fc | 21501 | + NULL, /* need to NULL terminate the list of attributes */ |
21502 | +}; | |
21503 | + | |
21504 | +static struct attribute_group sysaufs_attr_group_body = { | |
21505 | + .attrs = au_attr | |
21506 | +}; | |
21507 | + | |
21508 | +struct attribute_group *sysaufs_attr_group = &sysaufs_attr_group_body; | |
21509 | + | |
21510 | +/* ---------------------------------------------------------------------- */ | |
21511 | + | |
21512 | +int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb) | |
21513 | +{ | |
21514 | + int err; | |
21515 | + | |
dece6358 AM |
21516 | + SiMustAnyLock(sb); |
21517 | + | |
1facf9fc | 21518 | + err = 0; |
21519 | + if (au_opt_test(au_mntflags(sb), XINO)) { | |
21520 | + err = au_xino_path(seq, au_sbi(sb)->si_xib); | |
21521 | + seq_putc(seq, '\n'); | |
21522 | + } | |
21523 | + return err; | |
21524 | +} | |
21525 | + | |
21526 | +/* | |
21527 | + * the lifetime of branch is independent from the entry under sysfs. | |
21528 | + * sysfs handles the lifetime of the entry, and never call ->show() after it is | |
21529 | + * unlinked. | |
21530 | + */ | |
21531 | +static int sysaufs_si_br(struct seq_file *seq, struct super_block *sb, | |
21532 | + aufs_bindex_t bindex) | |
21533 | +{ | |
21534 | + struct path path; | |
21535 | + struct dentry *root; | |
21536 | + struct au_branch *br; | |
21537 | + | |
21538 | + AuDbg("b%d\n", bindex); | |
21539 | + | |
21540 | + root = sb->s_root; | |
21541 | + di_read_lock_parent(root, !AuLock_IR); | |
21542 | + br = au_sbr(sb, bindex); | |
21543 | + path.mnt = br->br_mnt; | |
21544 | + path.dentry = au_h_dptr(root, bindex); | |
21545 | + au_seq_path(seq, &path); | |
21546 | + di_read_unlock(root, !AuLock_IR); | |
21547 | + seq_printf(seq, "=%s\n", au_optstr_br_perm(br->br_perm)); | |
21548 | + return 0; | |
21549 | +} | |
21550 | + | |
21551 | +/* ---------------------------------------------------------------------- */ | |
21552 | + | |
21553 | +static struct seq_file *au_seq(char *p, ssize_t len) | |
21554 | +{ | |
21555 | + struct seq_file *seq; | |
21556 | + | |
21557 | + seq = kzalloc(sizeof(*seq), GFP_NOFS); | |
21558 | + if (seq) { | |
21559 | + /* mutex_init(&seq.lock); */ | |
21560 | + seq->buf = p; | |
21561 | + seq->size = len; | |
21562 | + return seq; /* success */ | |
21563 | + } | |
21564 | + | |
21565 | + seq = ERR_PTR(-ENOMEM); | |
21566 | + return seq; | |
21567 | +} | |
21568 | + | |
21569 | +#define SysaufsBr_PREFIX "br" | |
21570 | + | |
21571 | +/* todo: file size may exceed PAGE_SIZE */ | |
21572 | +ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr, | |
1308ab2a | 21573 | + char *buf) |
1facf9fc | 21574 | +{ |
21575 | + ssize_t err; | |
21576 | + long l; | |
21577 | + aufs_bindex_t bend; | |
21578 | + struct au_sbinfo *sbinfo; | |
21579 | + struct super_block *sb; | |
21580 | + struct seq_file *seq; | |
21581 | + char *name; | |
21582 | + struct attribute **cattr; | |
21583 | + | |
21584 | + sbinfo = container_of(kobj, struct au_sbinfo, si_kobj); | |
21585 | + sb = sbinfo->si_sb; | |
1308ab2a | 21586 | + |
21587 | + /* | |
21588 | + * prevent a race condition between sysfs and aufs. | |
21589 | + * for instance, sysfs_file_read() calls sysfs_get_active_two() which | |
21590 | + * prohibits maintaining the sysfs entries. | |
21591 | + * hew we acquire read lock after sysfs_get_active_two(). | |
21592 | + * on the other hand, the remount process may maintain the sysfs/aufs | |
21593 | + * entries after acquiring write lock. | |
21594 | + * it can cause a deadlock. | |
21595 | + * simply we gave up processing read here. | |
21596 | + */ | |
21597 | + err = -EBUSY; | |
21598 | + if (unlikely(!si_noflush_read_trylock(sb))) | |
21599 | + goto out; | |
1facf9fc | 21600 | + |
21601 | + seq = au_seq(buf, PAGE_SIZE); | |
21602 | + err = PTR_ERR(seq); | |
21603 | + if (IS_ERR(seq)) | |
1308ab2a | 21604 | + goto out_unlock; |
1facf9fc | 21605 | + |
21606 | + name = (void *)attr->name; | |
21607 | + cattr = sysaufs_si_attrs; | |
21608 | + while (*cattr) { | |
21609 | + if (!strcmp(name, (*cattr)->name)) { | |
21610 | + err = container_of(*cattr, struct sysaufs_si_attr, attr) | |
21611 | + ->show(seq, sb); | |
21612 | + goto out_seq; | |
21613 | + } | |
21614 | + cattr++; | |
21615 | + } | |
21616 | + | |
21617 | + bend = au_sbend(sb); | |
21618 | + if (!strncmp(name, SysaufsBr_PREFIX, sizeof(SysaufsBr_PREFIX) - 1)) { | |
21619 | + name += sizeof(SysaufsBr_PREFIX) - 1; | |
21620 | + err = strict_strtol(name, 10, &l); | |
21621 | + if (!err) { | |
21622 | + if (l <= bend) | |
21623 | + err = sysaufs_si_br(seq, sb, (aufs_bindex_t)l); | |
21624 | + else | |
21625 | + err = -ENOENT; | |
21626 | + } | |
21627 | + goto out_seq; | |
21628 | + } | |
21629 | + BUG(); | |
21630 | + | |
4f0767ce | 21631 | +out_seq: |
1facf9fc | 21632 | + if (!err) { |
21633 | + err = seq->count; | |
21634 | + /* sysfs limit */ | |
21635 | + if (unlikely(err == PAGE_SIZE)) | |
21636 | + err = -EFBIG; | |
21637 | + } | |
21638 | + kfree(seq); | |
4f0767ce | 21639 | +out_unlock: |
1facf9fc | 21640 | + si_read_unlock(sb); |
4f0767ce | 21641 | +out: |
1facf9fc | 21642 | + return err; |
21643 | +} | |
21644 | + | |
21645 | +/* ---------------------------------------------------------------------- */ | |
21646 | + | |
21647 | +void sysaufs_br_init(struct au_branch *br) | |
21648 | +{ | |
4a4d8108 AM |
21649 | + struct attribute *attr = &br->br_attr; |
21650 | + | |
21651 | + sysfs_attr_init(attr); | |
21652 | + attr->name = br->br_name; | |
21653 | + attr->mode = S_IRUGO; | |
1facf9fc | 21654 | +} |
21655 | + | |
21656 | +void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex) | |
21657 | +{ | |
21658 | + struct au_branch *br; | |
21659 | + struct kobject *kobj; | |
21660 | + aufs_bindex_t bend; | |
21661 | + | |
21662 | + dbgaufs_brs_del(sb, bindex); | |
21663 | + | |
21664 | + if (!sysaufs_brs) | |
21665 | + return; | |
21666 | + | |
21667 | + kobj = &au_sbi(sb)->si_kobj; | |
21668 | + bend = au_sbend(sb); | |
21669 | + for (; bindex <= bend; bindex++) { | |
21670 | + br = au_sbr(sb, bindex); | |
21671 | + sysfs_remove_file(kobj, &br->br_attr); | |
21672 | + } | |
21673 | +} | |
21674 | + | |
21675 | +void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex) | |
21676 | +{ | |
21677 | + int err; | |
21678 | + aufs_bindex_t bend; | |
21679 | + struct kobject *kobj; | |
21680 | + struct au_branch *br; | |
21681 | + | |
21682 | + dbgaufs_brs_add(sb, bindex); | |
21683 | + | |
21684 | + if (!sysaufs_brs) | |
21685 | + return; | |
21686 | + | |
21687 | + kobj = &au_sbi(sb)->si_kobj; | |
21688 | + bend = au_sbend(sb); | |
21689 | + for (; bindex <= bend; bindex++) { | |
21690 | + br = au_sbr(sb, bindex); | |
21691 | + snprintf(br->br_name, sizeof(br->br_name), SysaufsBr_PREFIX | |
21692 | + "%d", bindex); | |
21693 | + err = sysfs_create_file(kobj, &br->br_attr); | |
21694 | + if (unlikely(err)) | |
4a4d8108 AM |
21695 | + pr_warning("failed %s under sysfs(%d)\n", |
21696 | + br->br_name, err); | |
1facf9fc | 21697 | + } |
21698 | +} | |
b752ccd1 AM |
21699 | diff -urN /usr/share/empty/fs/aufs/sysrq.c linux/fs/aufs/sysrq.c |
21700 | --- /usr/share/empty/fs/aufs/sysrq.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 21701 | +++ linux/fs/aufs/sysrq.c 2010-10-21 09:52:43.093625591 +0200 |
4a4d8108 | 21702 | @@ -0,0 +1,119 @@ |
1facf9fc | 21703 | +/* |
4a4d8108 | 21704 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 21705 | + * |
21706 | + * This program, aufs is free software; you can redistribute it and/or modify | |
21707 | + * it under the terms of the GNU General Public License as published by | |
21708 | + * the Free Software Foundation; either version 2 of the License, or | |
21709 | + * (at your option) any later version. | |
dece6358 AM |
21710 | + * |
21711 | + * This program is distributed in the hope that it will be useful, | |
21712 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21713 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21714 | + * GNU General Public License for more details. | |
21715 | + * | |
21716 | + * You should have received a copy of the GNU General Public License | |
21717 | + * along with this program; if not, write to the Free Software | |
21718 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 21719 | + */ |
21720 | + | |
21721 | +/* | |
21722 | + * magic sysrq hanlder | |
21723 | + */ | |
21724 | + | |
21725 | +#include <linux/fs.h> | |
21726 | +#include <linux/module.h> | |
21727 | +#include <linux/moduleparam.h> | |
21728 | +/* #include <linux/sysrq.h> */ | |
21729 | +#include "aufs.h" | |
21730 | + | |
21731 | +/* ---------------------------------------------------------------------- */ | |
21732 | + | |
21733 | +static void sysrq_sb(struct super_block *sb) | |
21734 | +{ | |
21735 | + char *plevel; | |
21736 | + struct au_sbinfo *sbinfo; | |
21737 | + struct file *file; | |
21738 | + | |
21739 | + plevel = au_plevel; | |
21740 | + au_plevel = KERN_WARNING; | |
953406b4 | 21741 | + au_debug(1); |
1facf9fc | 21742 | + |
21743 | + sbinfo = au_sbi(sb); | |
4a4d8108 AM |
21744 | + /* since we define pr_fmt, call printk directly */ |
21745 | + printk(KERN_WARNING "si=%lx\n", sysaufs_si_id(sbinfo)); | |
21746 | + printk(KERN_WARNING AUFS_NAME ": superblock\n"); | |
1facf9fc | 21747 | + au_dpri_sb(sb); |
4a4d8108 | 21748 | + printk(KERN_WARNING AUFS_NAME ": root dentry\n"); |
1facf9fc | 21749 | + au_dpri_dentry(sb->s_root); |
4a4d8108 | 21750 | + printk(KERN_WARNING AUFS_NAME ": root inode\n"); |
1facf9fc | 21751 | + au_dpri_inode(sb->s_root->d_inode); |
21752 | +#if 0 | |
21753 | + struct inode *i; | |
4a4d8108 | 21754 | + printk(KERN_WARNING AUFS_NAME ": isolated inode\n"); |
1facf9fc | 21755 | + list_for_each_entry(i, &sb->s_inodes, i_sb_list) |
21756 | + if (list_empty(&i->i_dentry)) | |
21757 | + au_dpri_inode(i); | |
21758 | +#endif | |
4a4d8108 AM |
21759 | + printk(KERN_WARNING AUFS_NAME ": files\n"); |
21760 | + list_for_each_entry(file, &sb->s_files, f_u.fu_list) { | |
21761 | + umode_t mode; | |
21762 | + mode = file->f_dentry->d_inode->i_mode; | |
21763 | + if (!special_file(mode) || au_special_file(mode)) | |
1facf9fc | 21764 | + au_dpri_file(file); |
4a4d8108 | 21765 | + } |
1facf9fc | 21766 | + |
21767 | + au_plevel = plevel; | |
953406b4 | 21768 | + au_debug(0); |
1facf9fc | 21769 | +} |
21770 | + | |
21771 | +/* ---------------------------------------------------------------------- */ | |
21772 | + | |
21773 | +/* module parameter */ | |
21774 | +static char *aufs_sysrq_key = "a"; | |
21775 | +module_param_named(sysrq, aufs_sysrq_key, charp, S_IRUGO); | |
21776 | +MODULE_PARM_DESC(sysrq, "MagicSysRq key for " AUFS_NAME); | |
21777 | + | |
21778 | +static void au_sysrq(int key __maybe_unused, | |
21779 | + struct tty_struct *tty __maybe_unused) | |
21780 | +{ | |
953406b4 | 21781 | + struct kobject *kobj; |
1facf9fc | 21782 | + struct au_sbinfo *sbinfo; |
21783 | + | |
953406b4 AM |
21784 | + /* spin_lock(&sysaufs_ket->list_lock); */ |
21785 | + list_for_each_entry(kobj, &sysaufs_ket->list, entry) { | |
21786 | + sbinfo = container_of(kobj, struct au_sbinfo, si_kobj); | |
1facf9fc | 21787 | + sysrq_sb(sbinfo->si_sb); |
953406b4 AM |
21788 | + } |
21789 | + /* spin_unlock(&sysaufs_ket->list_lock); */ | |
1facf9fc | 21790 | +} |
21791 | + | |
21792 | +static struct sysrq_key_op au_sysrq_op = { | |
21793 | + .handler = au_sysrq, | |
21794 | + .help_msg = "Aufs", | |
21795 | + .action_msg = "Aufs", | |
21796 | + .enable_mask = SYSRQ_ENABLE_DUMP | |
21797 | +}; | |
21798 | + | |
21799 | +/* ---------------------------------------------------------------------- */ | |
21800 | + | |
21801 | +int __init au_sysrq_init(void) | |
21802 | +{ | |
21803 | + int err; | |
21804 | + char key; | |
21805 | + | |
21806 | + err = -1; | |
21807 | + key = *aufs_sysrq_key; | |
21808 | + if ('a' <= key && key <= 'z') | |
21809 | + err = register_sysrq_key(key, &au_sysrq_op); | |
21810 | + if (unlikely(err)) | |
4a4d8108 | 21811 | + pr_err("err %d, sysrq=%c\n", err, key); |
1facf9fc | 21812 | + return err; |
21813 | +} | |
21814 | + | |
21815 | +void au_sysrq_fin(void) | |
21816 | +{ | |
21817 | + int err; | |
21818 | + err = unregister_sysrq_key(*aufs_sysrq_key, &au_sysrq_op); | |
21819 | + if (unlikely(err)) | |
4a4d8108 | 21820 | + pr_err("err %d (ignored)\n", err); |
1facf9fc | 21821 | +} |
b752ccd1 AM |
21822 | diff -urN /usr/share/empty/fs/aufs/vdir.c linux/fs/aufs/vdir.c |
21823 | --- /usr/share/empty/fs/aufs/vdir.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 21824 | +++ linux/fs/aufs/vdir.c 2010-10-21 09:52:43.093625591 +0200 |
4a4d8108 | 21825 | @@ -0,0 +1,884 @@ |
1facf9fc | 21826 | +/* |
4a4d8108 | 21827 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 21828 | + * |
21829 | + * This program, aufs is free software; you can redistribute it and/or modify | |
21830 | + * it under the terms of the GNU General Public License as published by | |
21831 | + * the Free Software Foundation; either version 2 of the License, or | |
21832 | + * (at your option) any later version. | |
dece6358 AM |
21833 | + * |
21834 | + * This program is distributed in the hope that it will be useful, | |
21835 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21836 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21837 | + * GNU General Public License for more details. | |
21838 | + * | |
21839 | + * You should have received a copy of the GNU General Public License | |
21840 | + * along with this program; if not, write to the Free Software | |
21841 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 21842 | + */ |
21843 | + | |
21844 | +/* | |
21845 | + * virtual or vertical directory | |
21846 | + */ | |
21847 | + | |
dece6358 | 21848 | +#include <linux/hash.h> |
1facf9fc | 21849 | +#include "aufs.h" |
21850 | + | |
dece6358 | 21851 | +static unsigned int calc_size(int nlen) |
1facf9fc | 21852 | +{ |
dece6358 | 21853 | + return ALIGN(sizeof(struct au_vdir_de) + nlen, sizeof(ino_t)); |
1facf9fc | 21854 | +} |
21855 | + | |
21856 | +static int set_deblk_end(union au_vdir_deblk_p *p, | |
21857 | + union au_vdir_deblk_p *deblk_end) | |
21858 | +{ | |
21859 | + if (calc_size(0) <= deblk_end->deblk - p->deblk) { | |
21860 | + p->de->de_str.len = 0; | |
21861 | + /* smp_mb(); */ | |
21862 | + return 0; | |
21863 | + } | |
21864 | + return -1; /* error */ | |
21865 | +} | |
21866 | + | |
21867 | +/* returns true or false */ | |
21868 | +static int is_deblk_end(union au_vdir_deblk_p *p, | |
21869 | + union au_vdir_deblk_p *deblk_end) | |
21870 | +{ | |
21871 | + if (calc_size(0) <= deblk_end->deblk - p->deblk) | |
21872 | + return !p->de->de_str.len; | |
21873 | + return 1; | |
21874 | +} | |
21875 | + | |
21876 | +static unsigned char *last_deblk(struct au_vdir *vdir) | |
21877 | +{ | |
21878 | + return vdir->vd_deblk[vdir->vd_nblk - 1]; | |
21879 | +} | |
21880 | + | |
21881 | +/* ---------------------------------------------------------------------- */ | |
21882 | + | |
1308ab2a | 21883 | +/* estimate the apropriate size for name hash table */ |
21884 | +unsigned int au_rdhash_est(loff_t sz) | |
21885 | +{ | |
21886 | + unsigned int n; | |
21887 | + | |
21888 | + n = UINT_MAX; | |
21889 | + sz >>= 10; | |
21890 | + if (sz < n) | |
21891 | + n = sz; | |
21892 | + if (sz < AUFS_RDHASH_DEF) | |
21893 | + n = AUFS_RDHASH_DEF; | |
4a4d8108 | 21894 | + /* pr_info("n %u\n", n); */ |
1308ab2a | 21895 | + return n; |
21896 | +} | |
21897 | + | |
1facf9fc | 21898 | +/* |
21899 | + * the allocated memory has to be freed by | |
dece6358 | 21900 | + * au_nhash_wh_free() or au_nhash_de_free(). |
1facf9fc | 21901 | + */ |
dece6358 | 21902 | +int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp) |
1facf9fc | 21903 | +{ |
1facf9fc | 21904 | + struct hlist_head *head; |
dece6358 | 21905 | + unsigned int u; |
1facf9fc | 21906 | + |
dece6358 AM |
21907 | + head = kmalloc(sizeof(*nhash->nh_head) * num_hash, gfp); |
21908 | + if (head) { | |
21909 | + nhash->nh_num = num_hash; | |
21910 | + nhash->nh_head = head; | |
21911 | + for (u = 0; u < num_hash; u++) | |
1facf9fc | 21912 | + INIT_HLIST_HEAD(head++); |
dece6358 | 21913 | + return 0; /* success */ |
1facf9fc | 21914 | + } |
1facf9fc | 21915 | + |
dece6358 | 21916 | + return -ENOMEM; |
1facf9fc | 21917 | +} |
21918 | + | |
dece6358 AM |
21919 | +static void nhash_count(struct hlist_head *head) |
21920 | +{ | |
21921 | +#if 0 | |
21922 | + unsigned long n; | |
21923 | + struct hlist_node *pos; | |
21924 | + | |
21925 | + n = 0; | |
21926 | + hlist_for_each(pos, head) | |
21927 | + n++; | |
4a4d8108 | 21928 | + pr_info("%lu\n", n); |
dece6358 AM |
21929 | +#endif |
21930 | +} | |
21931 | + | |
21932 | +static void au_nhash_wh_do_free(struct hlist_head *head) | |
1facf9fc | 21933 | +{ |
1facf9fc | 21934 | + struct au_vdir_wh *tpos; |
21935 | + struct hlist_node *pos, *node; | |
21936 | + | |
dece6358 AM |
21937 | + hlist_for_each_entry_safe(tpos, pos, node, head, wh_hash) { |
21938 | + /* hlist_del(pos); */ | |
21939 | + kfree(tpos); | |
1facf9fc | 21940 | + } |
21941 | +} | |
21942 | + | |
dece6358 | 21943 | +static void au_nhash_de_do_free(struct hlist_head *head) |
1facf9fc | 21944 | +{ |
dece6358 AM |
21945 | + struct au_vdir_dehstr *tpos; |
21946 | + struct hlist_node *pos, *node; | |
1facf9fc | 21947 | + |
dece6358 AM |
21948 | + hlist_for_each_entry_safe(tpos, pos, node, head, hash) { |
21949 | + /* hlist_del(pos); */ | |
4a4d8108 | 21950 | + au_cache_free_vdir_dehstr(tpos); |
1facf9fc | 21951 | + } |
1facf9fc | 21952 | +} |
21953 | + | |
dece6358 AM |
21954 | +static void au_nhash_do_free(struct au_nhash *nhash, |
21955 | + void (*free)(struct hlist_head *head)) | |
1facf9fc | 21956 | +{ |
1308ab2a | 21957 | + unsigned int n; |
1facf9fc | 21958 | + struct hlist_head *head; |
1facf9fc | 21959 | + |
dece6358 | 21960 | + n = nhash->nh_num; |
1308ab2a | 21961 | + if (!n) |
21962 | + return; | |
21963 | + | |
dece6358 | 21964 | + head = nhash->nh_head; |
1308ab2a | 21965 | + while (n-- > 0) { |
dece6358 AM |
21966 | + nhash_count(head); |
21967 | + free(head++); | |
1facf9fc | 21968 | + } |
dece6358 | 21969 | + kfree(nhash->nh_head); |
1facf9fc | 21970 | +} |
21971 | + | |
dece6358 | 21972 | +void au_nhash_wh_free(struct au_nhash *whlist) |
1facf9fc | 21973 | +{ |
dece6358 AM |
21974 | + au_nhash_do_free(whlist, au_nhash_wh_do_free); |
21975 | +} | |
1facf9fc | 21976 | + |
dece6358 AM |
21977 | +static void au_nhash_de_free(struct au_nhash *delist) |
21978 | +{ | |
21979 | + au_nhash_do_free(delist, au_nhash_de_do_free); | |
1facf9fc | 21980 | +} |
21981 | + | |
21982 | +/* ---------------------------------------------------------------------- */ | |
21983 | + | |
21984 | +int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt, | |
21985 | + int limit) | |
21986 | +{ | |
21987 | + int num; | |
21988 | + unsigned int u, n; | |
21989 | + struct hlist_head *head; | |
21990 | + struct au_vdir_wh *tpos; | |
21991 | + struct hlist_node *pos; | |
21992 | + | |
21993 | + num = 0; | |
21994 | + n = whlist->nh_num; | |
21995 | + head = whlist->nh_head; | |
1308ab2a | 21996 | + for (u = 0; u < n; u++, head++) |
1facf9fc | 21997 | + hlist_for_each_entry(tpos, pos, head, wh_hash) |
21998 | + if (tpos->wh_bindex == btgt && ++num > limit) | |
21999 | + return 1; | |
1facf9fc | 22000 | + return 0; |
22001 | +} | |
22002 | + | |
22003 | +static struct hlist_head *au_name_hash(struct au_nhash *nhash, | |
dece6358 | 22004 | + unsigned char *name, |
1facf9fc | 22005 | + unsigned int len) |
22006 | +{ | |
dece6358 AM |
22007 | + unsigned int v; |
22008 | + /* const unsigned int magic_bit = 12; */ | |
22009 | + | |
1308ab2a | 22010 | + AuDebugOn(!nhash->nh_num || !nhash->nh_head); |
22011 | + | |
dece6358 AM |
22012 | + v = 0; |
22013 | + while (len--) | |
22014 | + v += *name++; | |
22015 | + /* v = hash_long(v, magic_bit); */ | |
22016 | + v %= nhash->nh_num; | |
22017 | + return nhash->nh_head + v; | |
22018 | +} | |
22019 | + | |
22020 | +static int au_nhash_test_name(struct au_vdir_destr *str, const char *name, | |
22021 | + int nlen) | |
22022 | +{ | |
22023 | + return str->len == nlen && !memcmp(str->name, name, nlen); | |
1facf9fc | 22024 | +} |
22025 | + | |
22026 | +/* returns found or not */ | |
dece6358 | 22027 | +int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen) |
1facf9fc | 22028 | +{ |
22029 | + struct hlist_head *head; | |
22030 | + struct au_vdir_wh *tpos; | |
22031 | + struct hlist_node *pos; | |
22032 | + struct au_vdir_destr *str; | |
22033 | + | |
dece6358 | 22034 | + head = au_name_hash(whlist, name, nlen); |
1facf9fc | 22035 | + hlist_for_each_entry(tpos, pos, head, wh_hash) { |
22036 | + str = &tpos->wh_str; | |
22037 | + AuDbg("%.*s\n", str->len, str->name); | |
dece6358 AM |
22038 | + if (au_nhash_test_name(str, name, nlen)) |
22039 | + return 1; | |
22040 | + } | |
22041 | + return 0; | |
22042 | +} | |
22043 | + | |
22044 | +/* returns found(true) or not */ | |
22045 | +static int test_known(struct au_nhash *delist, char *name, int nlen) | |
22046 | +{ | |
22047 | + struct hlist_head *head; | |
22048 | + struct au_vdir_dehstr *tpos; | |
22049 | + struct hlist_node *pos; | |
22050 | + struct au_vdir_destr *str; | |
22051 | + | |
22052 | + head = au_name_hash(delist, name, nlen); | |
22053 | + hlist_for_each_entry(tpos, pos, head, hash) { | |
22054 | + str = tpos->str; | |
22055 | + AuDbg("%.*s\n", str->len, str->name); | |
22056 | + if (au_nhash_test_name(str, name, nlen)) | |
1facf9fc | 22057 | + return 1; |
22058 | + } | |
22059 | + return 0; | |
22060 | +} | |
22061 | + | |
dece6358 AM |
22062 | +static void au_shwh_init_wh(struct au_vdir_wh *wh, ino_t ino, |
22063 | + unsigned char d_type) | |
22064 | +{ | |
22065 | +#ifdef CONFIG_AUFS_SHWH | |
22066 | + wh->wh_ino = ino; | |
22067 | + wh->wh_type = d_type; | |
22068 | +#endif | |
22069 | +} | |
22070 | + | |
22071 | +/* ---------------------------------------------------------------------- */ | |
22072 | + | |
22073 | +int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino, | |
22074 | + unsigned int d_type, aufs_bindex_t bindex, | |
22075 | + unsigned char shwh) | |
1facf9fc | 22076 | +{ |
22077 | + int err; | |
22078 | + struct au_vdir_destr *str; | |
22079 | + struct au_vdir_wh *wh; | |
22080 | + | |
dece6358 | 22081 | + AuDbg("%.*s\n", nlen, name); |
1308ab2a | 22082 | + AuDebugOn(!whlist->nh_num || !whlist->nh_head); |
22083 | + | |
1facf9fc | 22084 | + err = -ENOMEM; |
dece6358 | 22085 | + wh = kmalloc(sizeof(*wh) + nlen, GFP_NOFS); |
1facf9fc | 22086 | + if (unlikely(!wh)) |
22087 | + goto out; | |
22088 | + | |
22089 | + err = 0; | |
22090 | + wh->wh_bindex = bindex; | |
dece6358 AM |
22091 | + if (shwh) |
22092 | + au_shwh_init_wh(wh, ino, d_type); | |
1facf9fc | 22093 | + str = &wh->wh_str; |
dece6358 AM |
22094 | + str->len = nlen; |
22095 | + memcpy(str->name, name, nlen); | |
22096 | + hlist_add_head(&wh->wh_hash, au_name_hash(whlist, name, nlen)); | |
1facf9fc | 22097 | + /* smp_mb(); */ |
22098 | + | |
4f0767ce | 22099 | +out: |
1facf9fc | 22100 | + return err; |
22101 | +} | |
22102 | + | |
1facf9fc | 22103 | +static int append_deblk(struct au_vdir *vdir) |
22104 | +{ | |
22105 | + int err; | |
dece6358 | 22106 | + unsigned long ul; |
1facf9fc | 22107 | + const unsigned int deblk_sz = vdir->vd_deblk_sz; |
22108 | + union au_vdir_deblk_p p, deblk_end; | |
22109 | + unsigned char **o; | |
22110 | + | |
22111 | + err = -ENOMEM; | |
dece6358 AM |
22112 | + o = krealloc(vdir->vd_deblk, sizeof(*o) * (vdir->vd_nblk + 1), |
22113 | + GFP_NOFS); | |
1facf9fc | 22114 | + if (unlikely(!o)) |
22115 | + goto out; | |
22116 | + | |
22117 | + vdir->vd_deblk = o; | |
22118 | + p.deblk = kmalloc(deblk_sz, GFP_NOFS); | |
22119 | + if (p.deblk) { | |
22120 | + ul = vdir->vd_nblk++; | |
22121 | + vdir->vd_deblk[ul] = p.deblk; | |
22122 | + vdir->vd_last.ul = ul; | |
22123 | + vdir->vd_last.p.deblk = p.deblk; | |
22124 | + deblk_end.deblk = p.deblk + deblk_sz; | |
22125 | + err = set_deblk_end(&p, &deblk_end); | |
22126 | + } | |
22127 | + | |
4f0767ce | 22128 | +out: |
1facf9fc | 22129 | + return err; |
22130 | +} | |
22131 | + | |
dece6358 AM |
22132 | +static int append_de(struct au_vdir *vdir, char *name, int nlen, ino_t ino, |
22133 | + unsigned int d_type, struct au_nhash *delist) | |
22134 | +{ | |
22135 | + int err; | |
22136 | + unsigned int sz; | |
22137 | + const unsigned int deblk_sz = vdir->vd_deblk_sz; | |
22138 | + union au_vdir_deblk_p p, *room, deblk_end; | |
22139 | + struct au_vdir_dehstr *dehstr; | |
22140 | + | |
22141 | + p.deblk = last_deblk(vdir); | |
22142 | + deblk_end.deblk = p.deblk + deblk_sz; | |
22143 | + room = &vdir->vd_last.p; | |
22144 | + AuDebugOn(room->deblk < p.deblk || deblk_end.deblk <= room->deblk | |
22145 | + || !is_deblk_end(room, &deblk_end)); | |
22146 | + | |
22147 | + sz = calc_size(nlen); | |
22148 | + if (unlikely(sz > deblk_end.deblk - room->deblk)) { | |
22149 | + err = append_deblk(vdir); | |
22150 | + if (unlikely(err)) | |
22151 | + goto out; | |
22152 | + | |
22153 | + p.deblk = last_deblk(vdir); | |
22154 | + deblk_end.deblk = p.deblk + deblk_sz; | |
22155 | + /* smp_mb(); */ | |
22156 | + AuDebugOn(room->deblk != p.deblk); | |
22157 | + } | |
22158 | + | |
22159 | + err = -ENOMEM; | |
4a4d8108 | 22160 | + dehstr = au_cache_alloc_vdir_dehstr(); |
dece6358 AM |
22161 | + if (unlikely(!dehstr)) |
22162 | + goto out; | |
22163 | + | |
22164 | + dehstr->str = &room->de->de_str; | |
22165 | + hlist_add_head(&dehstr->hash, au_name_hash(delist, name, nlen)); | |
22166 | + room->de->de_ino = ino; | |
22167 | + room->de->de_type = d_type; | |
22168 | + room->de->de_str.len = nlen; | |
22169 | + memcpy(room->de->de_str.name, name, nlen); | |
22170 | + | |
22171 | + err = 0; | |
22172 | + room->deblk += sz; | |
22173 | + if (unlikely(set_deblk_end(room, &deblk_end))) | |
22174 | + err = append_deblk(vdir); | |
22175 | + /* smp_mb(); */ | |
22176 | + | |
4f0767ce | 22177 | +out: |
dece6358 AM |
22178 | + return err; |
22179 | +} | |
22180 | + | |
22181 | +/* ---------------------------------------------------------------------- */ | |
22182 | + | |
22183 | +void au_vdir_free(struct au_vdir *vdir) | |
22184 | +{ | |
22185 | + unsigned char **deblk; | |
22186 | + | |
22187 | + deblk = vdir->vd_deblk; | |
22188 | + while (vdir->vd_nblk--) | |
22189 | + kfree(*deblk++); | |
22190 | + kfree(vdir->vd_deblk); | |
22191 | + au_cache_free_vdir(vdir); | |
22192 | +} | |
22193 | + | |
1308ab2a | 22194 | +static struct au_vdir *alloc_vdir(struct file *file) |
1facf9fc | 22195 | +{ |
22196 | + struct au_vdir *vdir; | |
1308ab2a | 22197 | + struct super_block *sb; |
1facf9fc | 22198 | + int err; |
22199 | + | |
1308ab2a | 22200 | + sb = file->f_dentry->d_sb; |
dece6358 AM |
22201 | + SiMustAnyLock(sb); |
22202 | + | |
1facf9fc | 22203 | + err = -ENOMEM; |
22204 | + vdir = au_cache_alloc_vdir(); | |
22205 | + if (unlikely(!vdir)) | |
22206 | + goto out; | |
22207 | + | |
22208 | + vdir->vd_deblk = kzalloc(sizeof(*vdir->vd_deblk), GFP_NOFS); | |
22209 | + if (unlikely(!vdir->vd_deblk)) | |
22210 | + goto out_free; | |
22211 | + | |
22212 | + vdir->vd_deblk_sz = au_sbi(sb)->si_rdblk; | |
1308ab2a | 22213 | + if (!vdir->vd_deblk_sz) { |
22214 | + /* estimate the apropriate size for deblk */ | |
22215 | + vdir->vd_deblk_sz = au_dir_size(file, /*dentry*/NULL); | |
4a4d8108 | 22216 | + /* pr_info("vd_deblk_sz %u\n", vdir->vd_deblk_sz); */ |
1308ab2a | 22217 | + } |
1facf9fc | 22218 | + vdir->vd_nblk = 0; |
22219 | + vdir->vd_version = 0; | |
22220 | + vdir->vd_jiffy = 0; | |
22221 | + err = append_deblk(vdir); | |
22222 | + if (!err) | |
22223 | + return vdir; /* success */ | |
22224 | + | |
22225 | + kfree(vdir->vd_deblk); | |
22226 | + | |
4f0767ce | 22227 | +out_free: |
1facf9fc | 22228 | + au_cache_free_vdir(vdir); |
4f0767ce | 22229 | +out: |
1facf9fc | 22230 | + vdir = ERR_PTR(err); |
22231 | + return vdir; | |
22232 | +} | |
22233 | + | |
22234 | +static int reinit_vdir(struct au_vdir *vdir) | |
22235 | +{ | |
22236 | + int err; | |
22237 | + union au_vdir_deblk_p p, deblk_end; | |
22238 | + | |
22239 | + while (vdir->vd_nblk > 1) { | |
22240 | + kfree(vdir->vd_deblk[vdir->vd_nblk - 1]); | |
22241 | + /* vdir->vd_deblk[vdir->vd_nblk - 1] = NULL; */ | |
22242 | + vdir->vd_nblk--; | |
22243 | + } | |
22244 | + p.deblk = vdir->vd_deblk[0]; | |
22245 | + deblk_end.deblk = p.deblk + vdir->vd_deblk_sz; | |
22246 | + err = set_deblk_end(&p, &deblk_end); | |
22247 | + /* keep vd_dblk_sz */ | |
22248 | + vdir->vd_last.ul = 0; | |
22249 | + vdir->vd_last.p.deblk = vdir->vd_deblk[0]; | |
22250 | + vdir->vd_version = 0; | |
22251 | + vdir->vd_jiffy = 0; | |
22252 | + /* smp_mb(); */ | |
22253 | + return err; | |
22254 | +} | |
22255 | + | |
22256 | +/* ---------------------------------------------------------------------- */ | |
22257 | + | |
1facf9fc | 22258 | +#define AuFillVdir_CALLED 1 |
22259 | +#define AuFillVdir_WHABLE (1 << 1) | |
dece6358 | 22260 | +#define AuFillVdir_SHWH (1 << 2) |
1facf9fc | 22261 | +#define au_ftest_fillvdir(flags, name) ((flags) & AuFillVdir_##name) |
22262 | +#define au_fset_fillvdir(flags, name) { (flags) |= AuFillVdir_##name; } | |
22263 | +#define au_fclr_fillvdir(flags, name) { (flags) &= ~AuFillVdir_##name; } | |
22264 | + | |
dece6358 AM |
22265 | +#ifndef CONFIG_AUFS_SHWH |
22266 | +#undef AuFillVdir_SHWH | |
22267 | +#define AuFillVdir_SHWH 0 | |
22268 | +#endif | |
22269 | + | |
1facf9fc | 22270 | +struct fillvdir_arg { |
22271 | + struct file *file; | |
22272 | + struct au_vdir *vdir; | |
dece6358 AM |
22273 | + struct au_nhash delist; |
22274 | + struct au_nhash whlist; | |
1facf9fc | 22275 | + aufs_bindex_t bindex; |
22276 | + unsigned int flags; | |
22277 | + int err; | |
22278 | +}; | |
22279 | + | |
dece6358 | 22280 | +static int fillvdir(void *__arg, const char *__name, int nlen, |
1facf9fc | 22281 | + loff_t offset __maybe_unused, u64 h_ino, |
22282 | + unsigned int d_type) | |
22283 | +{ | |
22284 | + struct fillvdir_arg *arg = __arg; | |
22285 | + char *name = (void *)__name; | |
22286 | + struct super_block *sb; | |
1facf9fc | 22287 | + ino_t ino; |
dece6358 | 22288 | + const unsigned char shwh = !!au_ftest_fillvdir(arg->flags, SHWH); |
1facf9fc | 22289 | + |
1facf9fc | 22290 | + arg->err = 0; |
dece6358 | 22291 | + sb = arg->file->f_dentry->d_sb; |
1facf9fc | 22292 | + au_fset_fillvdir(arg->flags, CALLED); |
22293 | + /* smp_mb(); */ | |
dece6358 | 22294 | + if (nlen <= AUFS_WH_PFX_LEN |
1facf9fc | 22295 | + || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { |
dece6358 AM |
22296 | + if (test_known(&arg->delist, name, nlen) |
22297 | + || au_nhash_test_known_wh(&arg->whlist, name, nlen)) | |
22298 | + goto out; /* already exists or whiteouted */ | |
1facf9fc | 22299 | + |
22300 | + sb = arg->file->f_dentry->d_sb; | |
dece6358 | 22301 | + arg->err = au_ino(sb, arg->bindex, h_ino, d_type, &ino); |
4a4d8108 AM |
22302 | + if (!arg->err) { |
22303 | + if (unlikely(nlen > AUFS_MAX_NAMELEN)) | |
22304 | + d_type = DT_UNKNOWN; | |
dece6358 AM |
22305 | + arg->err = append_de(arg->vdir, name, nlen, ino, |
22306 | + d_type, &arg->delist); | |
4a4d8108 | 22307 | + } |
1facf9fc | 22308 | + } else if (au_ftest_fillvdir(arg->flags, WHABLE)) { |
22309 | + name += AUFS_WH_PFX_LEN; | |
dece6358 AM |
22310 | + nlen -= AUFS_WH_PFX_LEN; |
22311 | + if (au_nhash_test_known_wh(&arg->whlist, name, nlen)) | |
22312 | + goto out; /* already whiteouted */ | |
1facf9fc | 22313 | + |
dece6358 AM |
22314 | + if (shwh) |
22315 | + arg->err = au_wh_ino(sb, arg->bindex, h_ino, d_type, | |
22316 | + &ino); | |
4a4d8108 AM |
22317 | + if (!arg->err) { |
22318 | + if (nlen <= AUFS_MAX_NAMELEN + AUFS_WH_PFX_LEN) | |
22319 | + d_type = DT_UNKNOWN; | |
1facf9fc | 22320 | + arg->err = au_nhash_append_wh |
dece6358 AM |
22321 | + (&arg->whlist, name, nlen, ino, d_type, |
22322 | + arg->bindex, shwh); | |
4a4d8108 | 22323 | + } |
1facf9fc | 22324 | + } |
22325 | + | |
4f0767ce | 22326 | +out: |
1facf9fc | 22327 | + if (!arg->err) |
22328 | + arg->vdir->vd_jiffy = jiffies; | |
22329 | + /* smp_mb(); */ | |
22330 | + AuTraceErr(arg->err); | |
22331 | + return arg->err; | |
22332 | +} | |
22333 | + | |
dece6358 AM |
22334 | +static int au_handle_shwh(struct super_block *sb, struct au_vdir *vdir, |
22335 | + struct au_nhash *whlist, struct au_nhash *delist) | |
22336 | +{ | |
22337 | +#ifdef CONFIG_AUFS_SHWH | |
22338 | + int err; | |
22339 | + unsigned int nh, u; | |
22340 | + struct hlist_head *head; | |
22341 | + struct au_vdir_wh *tpos; | |
22342 | + struct hlist_node *pos, *n; | |
22343 | + char *p, *o; | |
22344 | + struct au_vdir_destr *destr; | |
22345 | + | |
22346 | + AuDebugOn(!au_opt_test(au_mntflags(sb), SHWH)); | |
22347 | + | |
22348 | + err = -ENOMEM; | |
4a4d8108 | 22349 | + o = p = __getname_gfp(GFP_NOFS); |
dece6358 AM |
22350 | + if (unlikely(!p)) |
22351 | + goto out; | |
22352 | + | |
22353 | + err = 0; | |
22354 | + nh = whlist->nh_num; | |
22355 | + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); | |
22356 | + p += AUFS_WH_PFX_LEN; | |
22357 | + for (u = 0; u < nh; u++) { | |
22358 | + head = whlist->nh_head + u; | |
22359 | + hlist_for_each_entry_safe(tpos, pos, n, head, wh_hash) { | |
22360 | + destr = &tpos->wh_str; | |
22361 | + memcpy(p, destr->name, destr->len); | |
22362 | + err = append_de(vdir, o, destr->len + AUFS_WH_PFX_LEN, | |
22363 | + tpos->wh_ino, tpos->wh_type, delist); | |
22364 | + if (unlikely(err)) | |
22365 | + break; | |
22366 | + } | |
22367 | + } | |
22368 | + | |
22369 | + __putname(o); | |
22370 | + | |
4f0767ce | 22371 | +out: |
dece6358 AM |
22372 | + AuTraceErr(err); |
22373 | + return err; | |
22374 | +#else | |
22375 | + return 0; | |
22376 | +#endif | |
22377 | +} | |
22378 | + | |
1facf9fc | 22379 | +static int au_do_read_vdir(struct fillvdir_arg *arg) |
22380 | +{ | |
22381 | + int err; | |
dece6358 | 22382 | + unsigned int rdhash; |
1facf9fc | 22383 | + loff_t offset; |
dece6358 AM |
22384 | + aufs_bindex_t bend, bindex, bstart; |
22385 | + unsigned char shwh; | |
1facf9fc | 22386 | + struct file *hf, *file; |
22387 | + struct super_block *sb; | |
22388 | + | |
1facf9fc | 22389 | + file = arg->file; |
22390 | + sb = file->f_dentry->d_sb; | |
dece6358 AM |
22391 | + SiMustAnyLock(sb); |
22392 | + | |
22393 | + rdhash = au_sbi(sb)->si_rdhash; | |
1308ab2a | 22394 | + if (!rdhash) |
22395 | + rdhash = au_rdhash_est(au_dir_size(file, /*dentry*/NULL)); | |
dece6358 AM |
22396 | + err = au_nhash_alloc(&arg->delist, rdhash, GFP_NOFS); |
22397 | + if (unlikely(err)) | |
1facf9fc | 22398 | + goto out; |
dece6358 AM |
22399 | + err = au_nhash_alloc(&arg->whlist, rdhash, GFP_NOFS); |
22400 | + if (unlikely(err)) | |
1facf9fc | 22401 | + goto out_delist; |
22402 | + | |
22403 | + err = 0; | |
22404 | + arg->flags = 0; | |
dece6358 AM |
22405 | + shwh = 0; |
22406 | + if (au_opt_test(au_mntflags(sb), SHWH)) { | |
22407 | + shwh = 1; | |
22408 | + au_fset_fillvdir(arg->flags, SHWH); | |
22409 | + } | |
22410 | + bstart = au_fbstart(file); | |
4a4d8108 | 22411 | + bend = au_fbend_dir(file); |
dece6358 | 22412 | + for (bindex = bstart; !err && bindex <= bend; bindex++) { |
4a4d8108 | 22413 | + hf = au_hf_dir(file, bindex); |
1facf9fc | 22414 | + if (!hf) |
22415 | + continue; | |
22416 | + | |
22417 | + offset = vfsub_llseek(hf, 0, SEEK_SET); | |
22418 | + err = offset; | |
22419 | + if (unlikely(offset)) | |
22420 | + break; | |
22421 | + | |
22422 | + arg->bindex = bindex; | |
22423 | + au_fclr_fillvdir(arg->flags, WHABLE); | |
dece6358 AM |
22424 | + if (shwh |
22425 | + || (bindex != bend | |
22426 | + && au_br_whable(au_sbr_perm(sb, bindex)))) | |
1facf9fc | 22427 | + au_fset_fillvdir(arg->flags, WHABLE); |
22428 | + do { | |
22429 | + arg->err = 0; | |
22430 | + au_fclr_fillvdir(arg->flags, CALLED); | |
22431 | + /* smp_mb(); */ | |
22432 | + err = vfsub_readdir(hf, fillvdir, arg); | |
22433 | + if (err >= 0) | |
22434 | + err = arg->err; | |
22435 | + } while (!err && au_ftest_fillvdir(arg->flags, CALLED)); | |
22436 | + } | |
dece6358 AM |
22437 | + |
22438 | + if (!err && shwh) | |
22439 | + err = au_handle_shwh(sb, arg->vdir, &arg->whlist, &arg->delist); | |
22440 | + | |
22441 | + au_nhash_wh_free(&arg->whlist); | |
1facf9fc | 22442 | + |
4f0767ce | 22443 | +out_delist: |
dece6358 | 22444 | + au_nhash_de_free(&arg->delist); |
4f0767ce | 22445 | +out: |
1facf9fc | 22446 | + return err; |
22447 | +} | |
22448 | + | |
22449 | +static int read_vdir(struct file *file, int may_read) | |
22450 | +{ | |
22451 | + int err; | |
22452 | + unsigned long expire; | |
22453 | + unsigned char do_read; | |
22454 | + struct fillvdir_arg arg; | |
22455 | + struct inode *inode; | |
22456 | + struct au_vdir *vdir, *allocated; | |
22457 | + | |
22458 | + err = 0; | |
22459 | + inode = file->f_dentry->d_inode; | |
22460 | + IMustLock(inode); | |
dece6358 AM |
22461 | + SiMustAnyLock(inode->i_sb); |
22462 | + | |
1facf9fc | 22463 | + allocated = NULL; |
22464 | + do_read = 0; | |
22465 | + expire = au_sbi(inode->i_sb)->si_rdcache; | |
22466 | + vdir = au_ivdir(inode); | |
22467 | + if (!vdir) { | |
22468 | + do_read = 1; | |
1308ab2a | 22469 | + vdir = alloc_vdir(file); |
1facf9fc | 22470 | + err = PTR_ERR(vdir); |
22471 | + if (IS_ERR(vdir)) | |
22472 | + goto out; | |
22473 | + err = 0; | |
22474 | + allocated = vdir; | |
22475 | + } else if (may_read | |
22476 | + && (inode->i_version != vdir->vd_version | |
22477 | + || time_after(jiffies, vdir->vd_jiffy + expire))) { | |
22478 | + do_read = 1; | |
22479 | + err = reinit_vdir(vdir); | |
22480 | + if (unlikely(err)) | |
22481 | + goto out; | |
22482 | + } | |
22483 | + | |
22484 | + if (!do_read) | |
22485 | + return 0; /* success */ | |
22486 | + | |
22487 | + arg.file = file; | |
22488 | + arg.vdir = vdir; | |
22489 | + err = au_do_read_vdir(&arg); | |
22490 | + if (!err) { | |
22491 | + /* file->f_pos = 0; */ | |
22492 | + vdir->vd_version = inode->i_version; | |
22493 | + vdir->vd_last.ul = 0; | |
22494 | + vdir->vd_last.p.deblk = vdir->vd_deblk[0]; | |
22495 | + if (allocated) | |
22496 | + au_set_ivdir(inode, allocated); | |
22497 | + } else if (allocated) | |
22498 | + au_vdir_free(allocated); | |
22499 | + | |
4f0767ce | 22500 | +out: |
1facf9fc | 22501 | + return err; |
22502 | +} | |
22503 | + | |
22504 | +static int copy_vdir(struct au_vdir *tgt, struct au_vdir *src) | |
22505 | +{ | |
22506 | + int err, rerr; | |
22507 | + unsigned long ul, n; | |
22508 | + const unsigned int deblk_sz = src->vd_deblk_sz; | |
22509 | + | |
22510 | + AuDebugOn(tgt->vd_nblk != 1); | |
22511 | + | |
22512 | + err = -ENOMEM; | |
22513 | + if (tgt->vd_nblk < src->vd_nblk) { | |
22514 | + unsigned char **p; | |
22515 | + | |
dece6358 AM |
22516 | + p = krealloc(tgt->vd_deblk, sizeof(*p) * src->vd_nblk, |
22517 | + GFP_NOFS); | |
1facf9fc | 22518 | + if (unlikely(!p)) |
22519 | + goto out; | |
22520 | + tgt->vd_deblk = p; | |
22521 | + } | |
22522 | + | |
1308ab2a | 22523 | + if (tgt->vd_deblk_sz != deblk_sz) { |
22524 | + unsigned char *p; | |
22525 | + | |
22526 | + tgt->vd_deblk_sz = deblk_sz; | |
22527 | + p = krealloc(tgt->vd_deblk[0], deblk_sz, GFP_NOFS); | |
22528 | + if (unlikely(!p)) | |
22529 | + goto out; | |
22530 | + tgt->vd_deblk[0] = p; | |
22531 | + } | |
1facf9fc | 22532 | + memcpy(tgt->vd_deblk[0], src->vd_deblk[0], deblk_sz); |
1facf9fc | 22533 | + tgt->vd_version = src->vd_version; |
22534 | + tgt->vd_jiffy = src->vd_jiffy; | |
22535 | + | |
22536 | + n = src->vd_nblk; | |
22537 | + for (ul = 1; ul < n; ul++) { | |
dece6358 AM |
22538 | + tgt->vd_deblk[ul] = kmemdup(src->vd_deblk[ul], deblk_sz, |
22539 | + GFP_NOFS); | |
22540 | + if (unlikely(!tgt->vd_deblk[ul])) | |
1facf9fc | 22541 | + goto out; |
1308ab2a | 22542 | + tgt->vd_nblk++; |
1facf9fc | 22543 | + } |
1308ab2a | 22544 | + tgt->vd_nblk = n; |
22545 | + tgt->vd_last.ul = tgt->vd_last.ul; | |
22546 | + tgt->vd_last.p.deblk = tgt->vd_deblk[tgt->vd_last.ul]; | |
22547 | + tgt->vd_last.p.deblk += src->vd_last.p.deblk | |
22548 | + - src->vd_deblk[src->vd_last.ul]; | |
1facf9fc | 22549 | + /* smp_mb(); */ |
22550 | + return 0; /* success */ | |
22551 | + | |
4f0767ce | 22552 | +out: |
1facf9fc | 22553 | + rerr = reinit_vdir(tgt); |
22554 | + BUG_ON(rerr); | |
22555 | + return err; | |
22556 | +} | |
22557 | + | |
22558 | +int au_vdir_init(struct file *file) | |
22559 | +{ | |
22560 | + int err; | |
22561 | + struct inode *inode; | |
22562 | + struct au_vdir *vdir_cache, *allocated; | |
22563 | + | |
22564 | + err = read_vdir(file, !file->f_pos); | |
22565 | + if (unlikely(err)) | |
22566 | + goto out; | |
22567 | + | |
22568 | + allocated = NULL; | |
22569 | + vdir_cache = au_fvdir_cache(file); | |
22570 | + if (!vdir_cache) { | |
1308ab2a | 22571 | + vdir_cache = alloc_vdir(file); |
1facf9fc | 22572 | + err = PTR_ERR(vdir_cache); |
22573 | + if (IS_ERR(vdir_cache)) | |
22574 | + goto out; | |
22575 | + allocated = vdir_cache; | |
22576 | + } else if (!file->f_pos && vdir_cache->vd_version != file->f_version) { | |
22577 | + err = reinit_vdir(vdir_cache); | |
22578 | + if (unlikely(err)) | |
22579 | + goto out; | |
22580 | + } else | |
22581 | + return 0; /* success */ | |
22582 | + | |
22583 | + inode = file->f_dentry->d_inode; | |
22584 | + err = copy_vdir(vdir_cache, au_ivdir(inode)); | |
22585 | + if (!err) { | |
22586 | + file->f_version = inode->i_version; | |
22587 | + if (allocated) | |
22588 | + au_set_fvdir_cache(file, allocated); | |
22589 | + } else if (allocated) | |
22590 | + au_vdir_free(allocated); | |
22591 | + | |
4f0767ce | 22592 | +out: |
1facf9fc | 22593 | + return err; |
22594 | +} | |
22595 | + | |
22596 | +static loff_t calc_offset(struct au_vdir *vdir) | |
22597 | +{ | |
22598 | + loff_t offset; | |
22599 | + union au_vdir_deblk_p p; | |
22600 | + | |
22601 | + p.deblk = vdir->vd_deblk[vdir->vd_last.ul]; | |
22602 | + offset = vdir->vd_last.p.deblk - p.deblk; | |
22603 | + offset += vdir->vd_deblk_sz * vdir->vd_last.ul; | |
22604 | + return offset; | |
22605 | +} | |
22606 | + | |
22607 | +/* returns true or false */ | |
22608 | +static int seek_vdir(struct file *file) | |
22609 | +{ | |
22610 | + int valid; | |
22611 | + unsigned int deblk_sz; | |
22612 | + unsigned long ul, n; | |
22613 | + loff_t offset; | |
22614 | + union au_vdir_deblk_p p, deblk_end; | |
22615 | + struct au_vdir *vdir_cache; | |
22616 | + | |
22617 | + valid = 1; | |
22618 | + vdir_cache = au_fvdir_cache(file); | |
22619 | + offset = calc_offset(vdir_cache); | |
22620 | + AuDbg("offset %lld\n", offset); | |
22621 | + if (file->f_pos == offset) | |
22622 | + goto out; | |
22623 | + | |
22624 | + vdir_cache->vd_last.ul = 0; | |
22625 | + vdir_cache->vd_last.p.deblk = vdir_cache->vd_deblk[0]; | |
22626 | + if (!file->f_pos) | |
22627 | + goto out; | |
22628 | + | |
22629 | + valid = 0; | |
22630 | + deblk_sz = vdir_cache->vd_deblk_sz; | |
22631 | + ul = div64_u64(file->f_pos, deblk_sz); | |
22632 | + AuDbg("ul %lu\n", ul); | |
22633 | + if (ul >= vdir_cache->vd_nblk) | |
22634 | + goto out; | |
22635 | + | |
22636 | + n = vdir_cache->vd_nblk; | |
22637 | + for (; ul < n; ul++) { | |
22638 | + p.deblk = vdir_cache->vd_deblk[ul]; | |
22639 | + deblk_end.deblk = p.deblk + deblk_sz; | |
22640 | + offset = ul; | |
22641 | + offset *= deblk_sz; | |
22642 | + while (!is_deblk_end(&p, &deblk_end) && offset < file->f_pos) { | |
22643 | + unsigned int l; | |
22644 | + | |
22645 | + l = calc_size(p.de->de_str.len); | |
22646 | + offset += l; | |
22647 | + p.deblk += l; | |
22648 | + } | |
22649 | + if (!is_deblk_end(&p, &deblk_end)) { | |
22650 | + valid = 1; | |
22651 | + vdir_cache->vd_last.ul = ul; | |
22652 | + vdir_cache->vd_last.p = p; | |
22653 | + break; | |
22654 | + } | |
22655 | + } | |
22656 | + | |
4f0767ce | 22657 | +out: |
1facf9fc | 22658 | + /* smp_mb(); */ |
22659 | + AuTraceErr(!valid); | |
22660 | + return valid; | |
22661 | +} | |
22662 | + | |
22663 | +int au_vdir_fill_de(struct file *file, void *dirent, filldir_t filldir) | |
22664 | +{ | |
22665 | + int err; | |
22666 | + unsigned int l, deblk_sz; | |
22667 | + union au_vdir_deblk_p deblk_end; | |
22668 | + struct au_vdir *vdir_cache; | |
22669 | + struct au_vdir_de *de; | |
22670 | + | |
22671 | + vdir_cache = au_fvdir_cache(file); | |
22672 | + if (!seek_vdir(file)) | |
22673 | + return 0; | |
22674 | + | |
22675 | + deblk_sz = vdir_cache->vd_deblk_sz; | |
22676 | + while (1) { | |
22677 | + deblk_end.deblk = vdir_cache->vd_deblk[vdir_cache->vd_last.ul]; | |
22678 | + deblk_end.deblk += deblk_sz; | |
22679 | + while (!is_deblk_end(&vdir_cache->vd_last.p, &deblk_end)) { | |
22680 | + de = vdir_cache->vd_last.p.de; | |
22681 | + AuDbg("%.*s, off%lld, i%lu, dt%d\n", | |
22682 | + de->de_str.len, de->de_str.name, file->f_pos, | |
22683 | + (unsigned long)de->de_ino, de->de_type); | |
22684 | + err = filldir(dirent, de->de_str.name, de->de_str.len, | |
22685 | + file->f_pos, de->de_ino, de->de_type); | |
22686 | + if (unlikely(err)) { | |
22687 | + AuTraceErr(err); | |
22688 | + /* todo: ignore the error caused by udba? */ | |
22689 | + /* return err; */ | |
22690 | + return 0; | |
22691 | + } | |
22692 | + | |
22693 | + l = calc_size(de->de_str.len); | |
22694 | + vdir_cache->vd_last.p.deblk += l; | |
22695 | + file->f_pos += l; | |
22696 | + } | |
22697 | + if (vdir_cache->vd_last.ul < vdir_cache->vd_nblk - 1) { | |
22698 | + vdir_cache->vd_last.ul++; | |
22699 | + vdir_cache->vd_last.p.deblk | |
22700 | + = vdir_cache->vd_deblk[vdir_cache->vd_last.ul]; | |
22701 | + file->f_pos = deblk_sz * vdir_cache->vd_last.ul; | |
22702 | + continue; | |
22703 | + } | |
22704 | + break; | |
22705 | + } | |
22706 | + | |
22707 | + /* smp_mb(); */ | |
22708 | + return 0; | |
22709 | +} | |
b752ccd1 AM |
22710 | diff -urN /usr/share/empty/fs/aufs/vfsub.c linux/fs/aufs/vfsub.c |
22711 | --- /usr/share/empty/fs/aufs/vfsub.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 22712 | +++ linux/fs/aufs/vfsub.c 2010-10-21 09:52:43.093625591 +0200 |
b752ccd1 | 22713 | @@ -0,0 +1,786 @@ |
1facf9fc | 22714 | +/* |
4a4d8108 | 22715 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 22716 | + * |
22717 | + * This program, aufs is free software; you can redistribute it and/or modify | |
22718 | + * it under the terms of the GNU General Public License as published by | |
22719 | + * the Free Software Foundation; either version 2 of the License, or | |
22720 | + * (at your option) any later version. | |
dece6358 AM |
22721 | + * |
22722 | + * This program is distributed in the hope that it will be useful, | |
22723 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22724 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22725 | + * GNU General Public License for more details. | |
22726 | + * | |
22727 | + * You should have received a copy of the GNU General Public License | |
22728 | + * along with this program; if not, write to the Free Software | |
22729 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 22730 | + */ |
22731 | + | |
22732 | +/* | |
22733 | + * sub-routines for VFS | |
22734 | + */ | |
22735 | + | |
4a4d8108 | 22736 | +#include <linux/file.h> |
1308ab2a | 22737 | +#include <linux/ima.h> |
dece6358 AM |
22738 | +#include <linux/namei.h> |
22739 | +#include <linux/security.h> | |
22740 | +#include <linux/splice.h> | |
1facf9fc | 22741 | +#include <linux/uaccess.h> |
22742 | +#include "aufs.h" | |
22743 | + | |
22744 | +int vfsub_update_h_iattr(struct path *h_path, int *did) | |
22745 | +{ | |
22746 | + int err; | |
22747 | + struct kstat st; | |
22748 | + struct super_block *h_sb; | |
22749 | + | |
22750 | + /* for remote fs, leave work for its getattr or d_revalidate */ | |
22751 | + /* for bad i_attr fs, handle them in aufs_getattr() */ | |
22752 | + /* still some fs may acquire i_mutex. we need to skip them */ | |
22753 | + err = 0; | |
22754 | + if (!did) | |
22755 | + did = &err; | |
22756 | + h_sb = h_path->dentry->d_sb; | |
22757 | + *did = (!au_test_fs_remote(h_sb) && au_test_fs_refresh_iattr(h_sb)); | |
22758 | + if (*did) | |
22759 | + err = vfs_getattr(h_path->mnt, h_path->dentry, &st); | |
22760 | + | |
22761 | + return err; | |
22762 | +} | |
22763 | + | |
22764 | +/* ---------------------------------------------------------------------- */ | |
22765 | + | |
4a4d8108 AM |
22766 | +static int au_conv_oflags(int flags) |
22767 | +{ | |
22768 | + int mask = 0; | |
22769 | + | |
22770 | +#ifdef CONFIG_IMA | |
22771 | + fmode_t fmode; | |
22772 | + | |
22773 | + /* mask = MAY_OPEN; */ | |
22774 | + fmode = OPEN_FMODE(flags); | |
22775 | + if (fmode & FMODE_READ) | |
22776 | + mask |= MAY_READ; | |
22777 | + if ((fmode & FMODE_WRITE) | |
22778 | + || (flags & O_TRUNC)) | |
22779 | + mask |= MAY_WRITE; | |
22780 | + /* | |
22781 | + * if (flags & O_APPEND) | |
22782 | + * mask |= MAY_APPEND; | |
22783 | + */ | |
22784 | + if (flags & vfsub_fmode_to_uint(FMODE_EXEC)) | |
22785 | + mask |= MAY_EXEC; | |
22786 | + | |
22787 | + AuDbg("flags 0x%x, mask 0x%x\n", flags, mask); | |
22788 | +#endif | |
22789 | + | |
22790 | + return mask; | |
22791 | +} | |
22792 | + | |
22793 | +struct file *vfsub_dentry_open(struct path *path, int flags) | |
1308ab2a | 22794 | +{ |
22795 | + struct file *file; | |
4a4d8108 | 22796 | + int err; |
1308ab2a | 22797 | + |
4a4d8108 AM |
22798 | + path_get(path); |
22799 | + file = dentry_open(path->dentry, path->mnt, flags, current_cred()); | |
1308ab2a | 22800 | + if (IS_ERR(file)) |
4a4d8108 AM |
22801 | + goto out; |
22802 | + | |
22803 | + err = ima_file_check(file, au_conv_oflags(flags)); | |
22804 | + if (unlikely(err)) { | |
22805 | + fput(file); | |
22806 | + file = ERR_PTR(err); | |
22807 | + } | |
22808 | +out: | |
1308ab2a | 22809 | + return file; |
22810 | +} | |
22811 | + | |
1facf9fc | 22812 | +struct file *vfsub_filp_open(const char *path, int oflags, int mode) |
22813 | +{ | |
22814 | + struct file *file; | |
22815 | + | |
1facf9fc | 22816 | + file = filp_open(path, oflags, mode); |
1facf9fc | 22817 | + if (IS_ERR(file)) |
22818 | + goto out; | |
22819 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
22820 | + | |
4f0767ce | 22821 | +out: |
1facf9fc | 22822 | + return file; |
22823 | +} | |
22824 | + | |
22825 | +int vfsub_kern_path(const char *name, unsigned int flags, struct path *path) | |
22826 | +{ | |
22827 | + int err; | |
22828 | + | |
1facf9fc | 22829 | + err = kern_path(name, flags, path); |
1facf9fc | 22830 | + if (!err && path->dentry->d_inode) |
22831 | + vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/ | |
22832 | + return err; | |
22833 | +} | |
22834 | + | |
22835 | +struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent, | |
22836 | + int len) | |
22837 | +{ | |
22838 | + struct path path = { | |
22839 | + .mnt = NULL | |
22840 | + }; | |
22841 | + | |
1308ab2a | 22842 | + /* VFS checks it too, but by WARN_ON_ONCE() */ |
1facf9fc | 22843 | + IMustLock(parent->d_inode); |
22844 | + | |
22845 | + path.dentry = lookup_one_len(name, parent, len); | |
22846 | + if (IS_ERR(path.dentry)) | |
22847 | + goto out; | |
22848 | + if (path.dentry->d_inode) | |
22849 | + vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/ | |
22850 | + | |
4f0767ce | 22851 | +out: |
4a4d8108 | 22852 | + AuTraceErrPtr(path.dentry); |
1facf9fc | 22853 | + return path.dentry; |
22854 | +} | |
22855 | + | |
22856 | +struct dentry *vfsub_lookup_hash(struct nameidata *nd) | |
22857 | +{ | |
22858 | + struct path path = { | |
22859 | + .mnt = nd->path.mnt | |
22860 | + }; | |
22861 | + | |
22862 | + IMustLock(nd->path.dentry->d_inode); | |
22863 | + | |
22864 | + path.dentry = lookup_hash(nd); | |
4a4d8108 AM |
22865 | + if (IS_ERR(path.dentry)) |
22866 | + goto out; | |
22867 | + if (path.dentry->d_inode) | |
1facf9fc | 22868 | + vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/ |
22869 | + | |
4f0767ce | 22870 | +out: |
4a4d8108 | 22871 | + AuTraceErrPtr(path.dentry); |
1facf9fc | 22872 | + return path.dentry; |
22873 | +} | |
22874 | + | |
22875 | +/* ---------------------------------------------------------------------- */ | |
22876 | + | |
22877 | +struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
22878 | + struct dentry *d2, struct au_hinode *hdir2) | |
22879 | +{ | |
22880 | + struct dentry *d; | |
22881 | + | |
1facf9fc | 22882 | + d = lock_rename(d1, d2); |
4a4d8108 | 22883 | + au_hn_suspend(hdir1); |
1facf9fc | 22884 | + if (hdir1 != hdir2) |
4a4d8108 | 22885 | + au_hn_suspend(hdir2); |
1facf9fc | 22886 | + |
22887 | + return d; | |
22888 | +} | |
22889 | + | |
22890 | +void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
22891 | + struct dentry *d2, struct au_hinode *hdir2) | |
22892 | +{ | |
4a4d8108 | 22893 | + au_hn_resume(hdir1); |
1facf9fc | 22894 | + if (hdir1 != hdir2) |
4a4d8108 | 22895 | + au_hn_resume(hdir2); |
1facf9fc | 22896 | + unlock_rename(d1, d2); |
1facf9fc | 22897 | +} |
22898 | + | |
22899 | +/* ---------------------------------------------------------------------- */ | |
22900 | + | |
22901 | +int vfsub_create(struct inode *dir, struct path *path, int mode) | |
22902 | +{ | |
22903 | + int err; | |
22904 | + struct dentry *d; | |
22905 | + | |
22906 | + IMustLock(dir); | |
22907 | + | |
22908 | + d = path->dentry; | |
22909 | + path->dentry = d->d_parent; | |
b752ccd1 | 22910 | + err = security_path_mknod(path, d, mode, 0); |
1facf9fc | 22911 | + path->dentry = d; |
22912 | + if (unlikely(err)) | |
22913 | + goto out; | |
22914 | + | |
22915 | + if (au_test_fs_null_nd(dir->i_sb)) | |
22916 | + err = vfs_create(dir, path->dentry, mode, NULL); | |
22917 | + else { | |
22918 | + struct nameidata h_nd; | |
22919 | + | |
22920 | + memset(&h_nd, 0, sizeof(h_nd)); | |
22921 | + h_nd.flags = LOOKUP_CREATE; | |
22922 | + h_nd.intent.open.flags = O_CREAT | |
22923 | + | vfsub_fmode_to_uint(FMODE_READ); | |
22924 | + h_nd.intent.open.create_mode = mode; | |
22925 | + h_nd.path.dentry = path->dentry->d_parent; | |
22926 | + h_nd.path.mnt = path->mnt; | |
22927 | + path_get(&h_nd.path); | |
22928 | + err = vfs_create(dir, path->dentry, mode, &h_nd); | |
22929 | + path_put(&h_nd.path); | |
22930 | + } | |
22931 | + | |
22932 | + if (!err) { | |
22933 | + struct path tmp = *path; | |
22934 | + int did; | |
22935 | + | |
22936 | + vfsub_update_h_iattr(&tmp, &did); | |
22937 | + if (did) { | |
22938 | + tmp.dentry = path->dentry->d_parent; | |
22939 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
22940 | + } | |
22941 | + /*ignore*/ | |
22942 | + } | |
22943 | + | |
4f0767ce | 22944 | +out: |
1facf9fc | 22945 | + return err; |
22946 | +} | |
22947 | + | |
22948 | +int vfsub_symlink(struct inode *dir, struct path *path, const char *symname) | |
22949 | +{ | |
22950 | + int err; | |
22951 | + struct dentry *d; | |
22952 | + | |
22953 | + IMustLock(dir); | |
22954 | + | |
22955 | + d = path->dentry; | |
22956 | + path->dentry = d->d_parent; | |
b752ccd1 | 22957 | + err = security_path_symlink(path, d, symname); |
1facf9fc | 22958 | + path->dentry = d; |
22959 | + if (unlikely(err)) | |
22960 | + goto out; | |
22961 | + | |
22962 | + err = vfs_symlink(dir, path->dentry, symname); | |
22963 | + if (!err) { | |
22964 | + struct path tmp = *path; | |
22965 | + int did; | |
22966 | + | |
22967 | + vfsub_update_h_iattr(&tmp, &did); | |
22968 | + if (did) { | |
22969 | + tmp.dentry = path->dentry->d_parent; | |
22970 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
22971 | + } | |
22972 | + /*ignore*/ | |
22973 | + } | |
22974 | + | |
4f0767ce | 22975 | +out: |
1facf9fc | 22976 | + return err; |
22977 | +} | |
22978 | + | |
22979 | +int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev) | |
22980 | +{ | |
22981 | + int err; | |
22982 | + struct dentry *d; | |
22983 | + | |
22984 | + IMustLock(dir); | |
22985 | + | |
22986 | + d = path->dentry; | |
22987 | + path->dentry = d->d_parent; | |
b752ccd1 | 22988 | + err = security_path_mknod(path, d, mode, dev); |
1facf9fc | 22989 | + path->dentry = d; |
22990 | + if (unlikely(err)) | |
22991 | + goto out; | |
22992 | + | |
22993 | + err = vfs_mknod(dir, path->dentry, mode, dev); | |
22994 | + if (!err) { | |
22995 | + struct path tmp = *path; | |
22996 | + int did; | |
22997 | + | |
22998 | + vfsub_update_h_iattr(&tmp, &did); | |
22999 | + if (did) { | |
23000 | + tmp.dentry = path->dentry->d_parent; | |
23001 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
23002 | + } | |
23003 | + /*ignore*/ | |
23004 | + } | |
23005 | + | |
4f0767ce | 23006 | +out: |
1facf9fc | 23007 | + return err; |
23008 | +} | |
23009 | + | |
23010 | +static int au_test_nlink(struct inode *inode) | |
23011 | +{ | |
23012 | + const unsigned int link_max = UINT_MAX >> 1; /* rough margin */ | |
23013 | + | |
23014 | + if (!au_test_fs_no_limit_nlink(inode->i_sb) | |
23015 | + || inode->i_nlink < link_max) | |
23016 | + return 0; | |
23017 | + return -EMLINK; | |
23018 | +} | |
23019 | + | |
23020 | +int vfsub_link(struct dentry *src_dentry, struct inode *dir, struct path *path) | |
23021 | +{ | |
23022 | + int err; | |
23023 | + struct dentry *d; | |
23024 | + | |
23025 | + IMustLock(dir); | |
23026 | + | |
23027 | + err = au_test_nlink(src_dentry->d_inode); | |
23028 | + if (unlikely(err)) | |
23029 | + return err; | |
23030 | + | |
23031 | + d = path->dentry; | |
23032 | + path->dentry = d->d_parent; | |
b752ccd1 | 23033 | + err = security_path_link(src_dentry, path, d); |
1facf9fc | 23034 | + path->dentry = d; |
23035 | + if (unlikely(err)) | |
23036 | + goto out; | |
23037 | + | |
1facf9fc | 23038 | + err = vfs_link(src_dentry, dir, path->dentry); |
1facf9fc | 23039 | + if (!err) { |
23040 | + struct path tmp = *path; | |
23041 | + int did; | |
23042 | + | |
23043 | + /* fuse has different memory inode for the same inumber */ | |
23044 | + vfsub_update_h_iattr(&tmp, &did); | |
23045 | + if (did) { | |
23046 | + tmp.dentry = path->dentry->d_parent; | |
23047 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
23048 | + tmp.dentry = src_dentry; | |
23049 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
23050 | + } | |
23051 | + /*ignore*/ | |
23052 | + } | |
23053 | + | |
4f0767ce | 23054 | +out: |
1facf9fc | 23055 | + return err; |
23056 | +} | |
23057 | + | |
23058 | +int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry, | |
23059 | + struct inode *dir, struct path *path) | |
23060 | +{ | |
23061 | + int err; | |
23062 | + struct path tmp = { | |
23063 | + .mnt = path->mnt | |
23064 | + }; | |
23065 | + struct dentry *d; | |
23066 | + | |
23067 | + IMustLock(dir); | |
23068 | + IMustLock(src_dir); | |
23069 | + | |
23070 | + d = path->dentry; | |
23071 | + path->dentry = d->d_parent; | |
23072 | + tmp.dentry = src_dentry->d_parent; | |
b752ccd1 | 23073 | + err = security_path_rename(&tmp, src_dentry, path, d); |
1facf9fc | 23074 | + path->dentry = d; |
23075 | + if (unlikely(err)) | |
23076 | + goto out; | |
23077 | + | |
1facf9fc | 23078 | + err = vfs_rename(src_dir, src_dentry, dir, path->dentry); |
1facf9fc | 23079 | + if (!err) { |
23080 | + int did; | |
23081 | + | |
23082 | + tmp.dentry = d->d_parent; | |
23083 | + vfsub_update_h_iattr(&tmp, &did); | |
23084 | + if (did) { | |
23085 | + tmp.dentry = src_dentry; | |
23086 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
23087 | + tmp.dentry = src_dentry->d_parent; | |
23088 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
23089 | + } | |
23090 | + /*ignore*/ | |
23091 | + } | |
23092 | + | |
4f0767ce | 23093 | +out: |
1facf9fc | 23094 | + return err; |
23095 | +} | |
23096 | + | |
23097 | +int vfsub_mkdir(struct inode *dir, struct path *path, int mode) | |
23098 | +{ | |
23099 | + int err; | |
23100 | + struct dentry *d; | |
23101 | + | |
23102 | + IMustLock(dir); | |
23103 | + | |
23104 | + d = path->dentry; | |
23105 | + path->dentry = d->d_parent; | |
b752ccd1 | 23106 | + err = security_path_mkdir(path, d, mode); |
1facf9fc | 23107 | + path->dentry = d; |
23108 | + if (unlikely(err)) | |
23109 | + goto out; | |
23110 | + | |
23111 | + err = vfs_mkdir(dir, path->dentry, mode); | |
23112 | + if (!err) { | |
23113 | + struct path tmp = *path; | |
23114 | + int did; | |
23115 | + | |
23116 | + vfsub_update_h_iattr(&tmp, &did); | |
23117 | + if (did) { | |
23118 | + tmp.dentry = path->dentry->d_parent; | |
23119 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
23120 | + } | |
23121 | + /*ignore*/ | |
23122 | + } | |
23123 | + | |
4f0767ce | 23124 | +out: |
1facf9fc | 23125 | + return err; |
23126 | +} | |
23127 | + | |
23128 | +int vfsub_rmdir(struct inode *dir, struct path *path) | |
23129 | +{ | |
23130 | + int err; | |
23131 | + struct dentry *d; | |
23132 | + | |
23133 | + IMustLock(dir); | |
23134 | + | |
23135 | + d = path->dentry; | |
23136 | + path->dentry = d->d_parent; | |
b752ccd1 | 23137 | + err = security_path_rmdir(path, d); |
1facf9fc | 23138 | + path->dentry = d; |
23139 | + if (unlikely(err)) | |
23140 | + goto out; | |
23141 | + | |
1facf9fc | 23142 | + err = vfs_rmdir(dir, path->dentry); |
1facf9fc | 23143 | + if (!err) { |
23144 | + struct path tmp = { | |
23145 | + .dentry = path->dentry->d_parent, | |
23146 | + .mnt = path->mnt | |
23147 | + }; | |
23148 | + | |
23149 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/ | |
23150 | + } | |
23151 | + | |
4f0767ce | 23152 | +out: |
1facf9fc | 23153 | + return err; |
23154 | +} | |
23155 | + | |
23156 | +/* ---------------------------------------------------------------------- */ | |
23157 | + | |
23158 | +ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count, | |
23159 | + loff_t *ppos) | |
23160 | +{ | |
23161 | + ssize_t err; | |
23162 | + | |
23163 | + err = vfs_read(file, ubuf, count, ppos); | |
23164 | + if (err >= 0) | |
23165 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
23166 | + return err; | |
23167 | +} | |
23168 | + | |
23169 | +/* todo: kernel_read()? */ | |
23170 | +ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, | |
23171 | + loff_t *ppos) | |
23172 | +{ | |
23173 | + ssize_t err; | |
23174 | + mm_segment_t oldfs; | |
b752ccd1 AM |
23175 | + union { |
23176 | + void *k; | |
23177 | + char __user *u; | |
23178 | + } buf; | |
1facf9fc | 23179 | + |
b752ccd1 | 23180 | + buf.k = kbuf; |
1facf9fc | 23181 | + oldfs = get_fs(); |
23182 | + set_fs(KERNEL_DS); | |
b752ccd1 | 23183 | + err = vfsub_read_u(file, buf.u, count, ppos); |
1facf9fc | 23184 | + set_fs(oldfs); |
23185 | + return err; | |
23186 | +} | |
23187 | + | |
23188 | +ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count, | |
23189 | + loff_t *ppos) | |
23190 | +{ | |
23191 | + ssize_t err; | |
23192 | + | |
1facf9fc | 23193 | + err = vfs_write(file, ubuf, count, ppos); |
1facf9fc | 23194 | + if (err >= 0) |
23195 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
23196 | + return err; | |
23197 | +} | |
23198 | + | |
23199 | +ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos) | |
23200 | +{ | |
23201 | + ssize_t err; | |
23202 | + mm_segment_t oldfs; | |
b752ccd1 AM |
23203 | + union { |
23204 | + void *k; | |
23205 | + const char __user *u; | |
23206 | + } buf; | |
1facf9fc | 23207 | + |
b752ccd1 | 23208 | + buf.k = kbuf; |
1facf9fc | 23209 | + oldfs = get_fs(); |
23210 | + set_fs(KERNEL_DS); | |
b752ccd1 | 23211 | + err = vfsub_write_u(file, buf.u, count, ppos); |
1facf9fc | 23212 | + set_fs(oldfs); |
23213 | + return err; | |
23214 | +} | |
23215 | + | |
4a4d8108 AM |
23216 | +int vfsub_flush(struct file *file, fl_owner_t id) |
23217 | +{ | |
23218 | + int err; | |
23219 | + | |
23220 | + err = 0; | |
23221 | + if (file->f_op && file->f_op->flush) { | |
23222 | + err = file->f_op->flush(file, id); | |
23223 | + if (!err) | |
23224 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); | |
23225 | + /*ignore*/ | |
23226 | + } | |
23227 | + return err; | |
23228 | +} | |
23229 | + | |
1facf9fc | 23230 | +int vfsub_readdir(struct file *file, filldir_t filldir, void *arg) |
23231 | +{ | |
23232 | + int err; | |
23233 | + | |
1facf9fc | 23234 | + err = vfs_readdir(file, filldir, arg); |
1facf9fc | 23235 | + if (err >= 0) |
23236 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
23237 | + return err; | |
23238 | +} | |
23239 | + | |
23240 | +long vfsub_splice_to(struct file *in, loff_t *ppos, | |
23241 | + struct pipe_inode_info *pipe, size_t len, | |
23242 | + unsigned int flags) | |
23243 | +{ | |
23244 | + long err; | |
23245 | + | |
0fc653ad | 23246 | + err = do_splice_to(in, ppos, pipe, len, flags); |
4a4d8108 | 23247 | + file_accessed(in); |
1facf9fc | 23248 | + if (err >= 0) |
23249 | + vfsub_update_h_iattr(&in->f_path, /*did*/NULL); /*ignore*/ | |
23250 | + return err; | |
23251 | +} | |
23252 | + | |
23253 | +long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
23254 | + loff_t *ppos, size_t len, unsigned int flags) | |
23255 | +{ | |
23256 | + long err; | |
23257 | + | |
0fc653ad | 23258 | + err = do_splice_from(pipe, out, ppos, len, flags); |
1facf9fc | 23259 | + if (err >= 0) |
23260 | + vfsub_update_h_iattr(&out->f_path, /*did*/NULL); /*ignore*/ | |
23261 | + return err; | |
23262 | +} | |
23263 | + | |
23264 | +/* cf. open.c:do_sys_truncate() and do_sys_ftruncate() */ | |
23265 | +int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr, | |
23266 | + struct file *h_file) | |
23267 | +{ | |
23268 | + int err; | |
23269 | + struct inode *h_inode; | |
23270 | + | |
23271 | + h_inode = h_path->dentry->d_inode; | |
23272 | + if (!h_file) { | |
23273 | + err = mnt_want_write(h_path->mnt); | |
23274 | + if (err) | |
23275 | + goto out; | |
23276 | + err = inode_permission(h_inode, MAY_WRITE); | |
23277 | + if (err) | |
23278 | + goto out_mnt; | |
23279 | + err = get_write_access(h_inode); | |
23280 | + if (err) | |
23281 | + goto out_mnt; | |
4a4d8108 | 23282 | + err = break_lease(h_inode, O_WRONLY); |
1facf9fc | 23283 | + if (err) |
23284 | + goto out_inode; | |
23285 | + } | |
23286 | + | |
23287 | + err = locks_verify_truncate(h_inode, h_file, length); | |
23288 | + if (!err) | |
953406b4 | 23289 | + err = security_path_truncate(h_path); |
b752ccd1 | 23290 | + if (!err) |
1facf9fc | 23291 | + err = do_truncate(h_path->dentry, length, attr, h_file); |
1facf9fc | 23292 | + |
4f0767ce | 23293 | +out_inode: |
1facf9fc | 23294 | + if (!h_file) |
23295 | + put_write_access(h_inode); | |
4f0767ce | 23296 | +out_mnt: |
1facf9fc | 23297 | + if (!h_file) |
23298 | + mnt_drop_write(h_path->mnt); | |
4f0767ce | 23299 | +out: |
1facf9fc | 23300 | + return err; |
23301 | +} | |
23302 | + | |
23303 | +/* ---------------------------------------------------------------------- */ | |
23304 | + | |
23305 | +struct au_vfsub_mkdir_args { | |
23306 | + int *errp; | |
23307 | + struct inode *dir; | |
23308 | + struct path *path; | |
23309 | + int mode; | |
23310 | +}; | |
23311 | + | |
23312 | +static void au_call_vfsub_mkdir(void *args) | |
23313 | +{ | |
23314 | + struct au_vfsub_mkdir_args *a = args; | |
23315 | + *a->errp = vfsub_mkdir(a->dir, a->path, a->mode); | |
23316 | +} | |
23317 | + | |
23318 | +int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode) | |
23319 | +{ | |
23320 | + int err, do_sio, wkq_err; | |
23321 | + | |
23322 | + do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE); | |
23323 | + if (!do_sio) | |
23324 | + err = vfsub_mkdir(dir, path, mode); | |
23325 | + else { | |
23326 | + struct au_vfsub_mkdir_args args = { | |
23327 | + .errp = &err, | |
23328 | + .dir = dir, | |
23329 | + .path = path, | |
23330 | + .mode = mode | |
23331 | + }; | |
23332 | + wkq_err = au_wkq_wait(au_call_vfsub_mkdir, &args); | |
23333 | + if (unlikely(wkq_err)) | |
23334 | + err = wkq_err; | |
23335 | + } | |
23336 | + | |
23337 | + return err; | |
23338 | +} | |
23339 | + | |
23340 | +struct au_vfsub_rmdir_args { | |
23341 | + int *errp; | |
23342 | + struct inode *dir; | |
23343 | + struct path *path; | |
23344 | +}; | |
23345 | + | |
23346 | +static void au_call_vfsub_rmdir(void *args) | |
23347 | +{ | |
23348 | + struct au_vfsub_rmdir_args *a = args; | |
23349 | + *a->errp = vfsub_rmdir(a->dir, a->path); | |
23350 | +} | |
23351 | + | |
23352 | +int vfsub_sio_rmdir(struct inode *dir, struct path *path) | |
23353 | +{ | |
23354 | + int err, do_sio, wkq_err; | |
23355 | + | |
23356 | + do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE); | |
23357 | + if (!do_sio) | |
23358 | + err = vfsub_rmdir(dir, path); | |
23359 | + else { | |
23360 | + struct au_vfsub_rmdir_args args = { | |
23361 | + .errp = &err, | |
23362 | + .dir = dir, | |
23363 | + .path = path | |
23364 | + }; | |
23365 | + wkq_err = au_wkq_wait(au_call_vfsub_rmdir, &args); | |
23366 | + if (unlikely(wkq_err)) | |
23367 | + err = wkq_err; | |
23368 | + } | |
23369 | + | |
23370 | + return err; | |
23371 | +} | |
23372 | + | |
23373 | +/* ---------------------------------------------------------------------- */ | |
23374 | + | |
23375 | +struct notify_change_args { | |
23376 | + int *errp; | |
23377 | + struct path *path; | |
23378 | + struct iattr *ia; | |
23379 | +}; | |
23380 | + | |
23381 | +static void call_notify_change(void *args) | |
23382 | +{ | |
23383 | + struct notify_change_args *a = args; | |
23384 | + struct inode *h_inode; | |
23385 | + | |
23386 | + h_inode = a->path->dentry->d_inode; | |
23387 | + IMustLock(h_inode); | |
23388 | + | |
23389 | + *a->errp = -EPERM; | |
23390 | + if (!IS_IMMUTABLE(h_inode) && !IS_APPEND(h_inode)) { | |
1facf9fc | 23391 | + *a->errp = notify_change(a->path->dentry, a->ia); |
1facf9fc | 23392 | + if (!*a->errp) |
23393 | + vfsub_update_h_iattr(a->path, /*did*/NULL); /*ignore*/ | |
23394 | + } | |
23395 | + AuTraceErr(*a->errp); | |
23396 | +} | |
23397 | + | |
23398 | +int vfsub_notify_change(struct path *path, struct iattr *ia) | |
23399 | +{ | |
23400 | + int err; | |
23401 | + struct notify_change_args args = { | |
23402 | + .errp = &err, | |
23403 | + .path = path, | |
23404 | + .ia = ia | |
23405 | + }; | |
23406 | + | |
23407 | + call_notify_change(&args); | |
23408 | + | |
23409 | + return err; | |
23410 | +} | |
23411 | + | |
23412 | +int vfsub_sio_notify_change(struct path *path, struct iattr *ia) | |
23413 | +{ | |
23414 | + int err, wkq_err; | |
23415 | + struct notify_change_args args = { | |
23416 | + .errp = &err, | |
23417 | + .path = path, | |
23418 | + .ia = ia | |
23419 | + }; | |
23420 | + | |
23421 | + wkq_err = au_wkq_wait(call_notify_change, &args); | |
23422 | + if (unlikely(wkq_err)) | |
23423 | + err = wkq_err; | |
23424 | + | |
23425 | + return err; | |
23426 | +} | |
23427 | + | |
23428 | +/* ---------------------------------------------------------------------- */ | |
23429 | + | |
23430 | +struct unlink_args { | |
23431 | + int *errp; | |
23432 | + struct inode *dir; | |
23433 | + struct path *path; | |
23434 | +}; | |
23435 | + | |
23436 | +static void call_unlink(void *args) | |
23437 | +{ | |
23438 | + struct unlink_args *a = args; | |
23439 | + struct dentry *d = a->path->dentry; | |
23440 | + struct inode *h_inode; | |
23441 | + const int stop_sillyrename = (au_test_nfs(d->d_sb) | |
23442 | + && atomic_read(&d->d_count) == 1); | |
23443 | + | |
23444 | + IMustLock(a->dir); | |
23445 | + | |
23446 | + a->path->dentry = d->d_parent; | |
23447 | + *a->errp = security_path_unlink(a->path, d); | |
23448 | + a->path->dentry = d; | |
23449 | + if (unlikely(*a->errp)) | |
23450 | + return; | |
23451 | + | |
23452 | + if (!stop_sillyrename) | |
23453 | + dget(d); | |
23454 | + h_inode = d->d_inode; | |
23455 | + if (h_inode) | |
23456 | + atomic_inc(&h_inode->i_count); | |
23457 | + | |
1facf9fc | 23458 | + *a->errp = vfs_unlink(a->dir, d); |
1facf9fc | 23459 | + if (!*a->errp) { |
23460 | + struct path tmp = { | |
23461 | + .dentry = d->d_parent, | |
23462 | + .mnt = a->path->mnt | |
23463 | + }; | |
23464 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/ | |
23465 | + } | |
23466 | + | |
23467 | + if (!stop_sillyrename) | |
23468 | + dput(d); | |
23469 | + if (h_inode) | |
23470 | + iput(h_inode); | |
23471 | + | |
23472 | + AuTraceErr(*a->errp); | |
23473 | +} | |
23474 | + | |
23475 | +/* | |
23476 | + * @dir: must be locked. | |
23477 | + * @dentry: target dentry. | |
23478 | + */ | |
23479 | +int vfsub_unlink(struct inode *dir, struct path *path, int force) | |
23480 | +{ | |
23481 | + int err; | |
23482 | + struct unlink_args args = { | |
23483 | + .errp = &err, | |
23484 | + .dir = dir, | |
23485 | + .path = path | |
23486 | + }; | |
23487 | + | |
23488 | + if (!force) | |
23489 | + call_unlink(&args); | |
23490 | + else { | |
23491 | + int wkq_err; | |
23492 | + | |
23493 | + wkq_err = au_wkq_wait(call_unlink, &args); | |
23494 | + if (unlikely(wkq_err)) | |
23495 | + err = wkq_err; | |
23496 | + } | |
23497 | + | |
23498 | + return err; | |
23499 | +} | |
b752ccd1 AM |
23500 | diff -urN /usr/share/empty/fs/aufs/vfsub.h linux/fs/aufs/vfsub.h |
23501 | --- /usr/share/empty/fs/aufs/vfsub.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 23502 | +++ linux/fs/aufs/vfsub.h 2010-10-21 09:52:43.093625591 +0200 |
b752ccd1 | 23503 | @@ -0,0 +1,174 @@ |
1facf9fc | 23504 | +/* |
4a4d8108 | 23505 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 23506 | + * |
23507 | + * This program, aufs is free software; you can redistribute it and/or modify | |
23508 | + * it under the terms of the GNU General Public License as published by | |
23509 | + * the Free Software Foundation; either version 2 of the License, or | |
23510 | + * (at your option) any later version. | |
dece6358 AM |
23511 | + * |
23512 | + * This program is distributed in the hope that it will be useful, | |
23513 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23514 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
23515 | + * GNU General Public License for more details. | |
23516 | + * | |
23517 | + * You should have received a copy of the GNU General Public License | |
23518 | + * along with this program; if not, write to the Free Software | |
23519 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 23520 | + */ |
23521 | + | |
23522 | +/* | |
23523 | + * sub-routines for VFS | |
23524 | + */ | |
23525 | + | |
23526 | +#ifndef __AUFS_VFSUB_H__ | |
23527 | +#define __AUFS_VFSUB_H__ | |
23528 | + | |
23529 | +#ifdef __KERNEL__ | |
23530 | + | |
23531 | +#include <linux/fs.h> | |
1facf9fc | 23532 | + |
23533 | +/* ---------------------------------------------------------------------- */ | |
23534 | + | |
23535 | +/* lock subclass for lower inode */ | |
23536 | +/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */ | |
23537 | +/* reduce? gave up. */ | |
23538 | +enum { | |
23539 | + AuLsc_I_Begin = I_MUTEX_QUOTA, /* 4 */ | |
23540 | + AuLsc_I_PARENT, /* lower inode, parent first */ | |
23541 | + AuLsc_I_PARENT2, /* copyup dirs */ | |
dece6358 | 23542 | + AuLsc_I_PARENT3, /* copyup wh */ |
1facf9fc | 23543 | + AuLsc_I_CHILD, |
23544 | + AuLsc_I_CHILD2, | |
23545 | + AuLsc_I_End | |
23546 | +}; | |
23547 | + | |
23548 | +/* to debug easier, do not make them inlined functions */ | |
23549 | +#define MtxMustLock(mtx) AuDebugOn(!mutex_is_locked(mtx)) | |
23550 | +#define IMustLock(i) MtxMustLock(&(i)->i_mutex) | |
23551 | + | |
23552 | +/* ---------------------------------------------------------------------- */ | |
23553 | + | |
1facf9fc | 23554 | +int vfsub_update_h_iattr(struct path *h_path, int *did); |
4a4d8108 | 23555 | +struct file *vfsub_dentry_open(struct path *path, int flags); |
1facf9fc | 23556 | +struct file *vfsub_filp_open(const char *path, int oflags, int mode); |
23557 | +int vfsub_kern_path(const char *name, unsigned int flags, struct path *path); | |
23558 | +struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent, | |
23559 | + int len); | |
23560 | +struct dentry *vfsub_lookup_hash(struct nameidata *nd); | |
23561 | + | |
23562 | +/* ---------------------------------------------------------------------- */ | |
23563 | + | |
23564 | +struct au_hinode; | |
23565 | +struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
23566 | + struct dentry *d2, struct au_hinode *hdir2); | |
23567 | +void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
23568 | + struct dentry *d2, struct au_hinode *hdir2); | |
23569 | + | |
23570 | +int vfsub_create(struct inode *dir, struct path *path, int mode); | |
23571 | +int vfsub_symlink(struct inode *dir, struct path *path, | |
23572 | + const char *symname); | |
23573 | +int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev); | |
23574 | +int vfsub_link(struct dentry *src_dentry, struct inode *dir, | |
23575 | + struct path *path); | |
23576 | +int vfsub_rename(struct inode *src_hdir, struct dentry *src_dentry, | |
23577 | + struct inode *hdir, struct path *path); | |
23578 | +int vfsub_mkdir(struct inode *dir, struct path *path, int mode); | |
23579 | +int vfsub_rmdir(struct inode *dir, struct path *path); | |
23580 | + | |
23581 | +/* ---------------------------------------------------------------------- */ | |
23582 | + | |
23583 | +ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count, | |
23584 | + loff_t *ppos); | |
23585 | +ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, | |
23586 | + loff_t *ppos); | |
23587 | +ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count, | |
23588 | + loff_t *ppos); | |
23589 | +ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, | |
23590 | + loff_t *ppos); | |
4a4d8108 | 23591 | +int vfsub_flush(struct file *file, fl_owner_t id); |
1facf9fc | 23592 | +int vfsub_readdir(struct file *file, filldir_t filldir, void *arg); |
23593 | + | |
4a4d8108 AM |
23594 | +static inline unsigned int vfsub_file_flags(struct file *file) |
23595 | +{ | |
23596 | + unsigned int flags; | |
23597 | + | |
23598 | + spin_lock(&file->f_lock); | |
23599 | + flags = file->f_flags; | |
23600 | + spin_unlock(&file->f_lock); | |
23601 | + | |
23602 | + return flags; | |
23603 | +} | |
1308ab2a | 23604 | + |
1facf9fc | 23605 | +static inline void vfsub_file_accessed(struct file *h_file) |
23606 | +{ | |
23607 | + file_accessed(h_file); | |
23608 | + vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); /*ignore*/ | |
23609 | +} | |
23610 | + | |
23611 | +static inline void vfsub_touch_atime(struct vfsmount *h_mnt, | |
23612 | + struct dentry *h_dentry) | |
23613 | +{ | |
23614 | + struct path h_path = { | |
23615 | + .dentry = h_dentry, | |
23616 | + .mnt = h_mnt | |
23617 | + }; | |
23618 | + touch_atime(h_mnt, h_dentry); | |
23619 | + vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/ | |
23620 | +} | |
23621 | + | |
4a4d8108 AM |
23622 | +long vfsub_splice_to(struct file *in, loff_t *ppos, |
23623 | + struct pipe_inode_info *pipe, size_t len, | |
23624 | + unsigned int flags); | |
23625 | +long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
23626 | + loff_t *ppos, size_t len, unsigned int flags); | |
23627 | +int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr, | |
23628 | + struct file *h_file); | |
23629 | + | |
1facf9fc | 23630 | +/* ---------------------------------------------------------------------- */ |
23631 | + | |
23632 | +static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin) | |
23633 | +{ | |
23634 | + loff_t err; | |
23635 | + | |
1facf9fc | 23636 | + err = vfs_llseek(file, offset, origin); |
1facf9fc | 23637 | + return err; |
23638 | +} | |
23639 | + | |
23640 | +/* ---------------------------------------------------------------------- */ | |
23641 | + | |
23642 | +/* dirty workaround for strict type of fmode_t */ | |
23643 | +union vfsub_fmu { | |
23644 | + fmode_t fm; | |
23645 | + unsigned int ui; | |
23646 | +}; | |
23647 | + | |
23648 | +static inline unsigned int vfsub_fmode_to_uint(fmode_t fm) | |
23649 | +{ | |
23650 | + union vfsub_fmu u = { | |
23651 | + .fm = fm | |
23652 | + }; | |
23653 | + | |
23654 | + BUILD_BUG_ON(sizeof(u.fm) != sizeof(u.ui)); | |
23655 | + | |
23656 | + return u.ui; | |
23657 | +} | |
23658 | + | |
23659 | +static inline fmode_t vfsub_uint_to_fmode(unsigned int ui) | |
23660 | +{ | |
23661 | + union vfsub_fmu u = { | |
23662 | + .ui = ui | |
23663 | + }; | |
23664 | + | |
23665 | + return u.fm; | |
23666 | +} | |
23667 | + | |
4a4d8108 AM |
23668 | +/* ---------------------------------------------------------------------- */ |
23669 | + | |
23670 | +int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode); | |
23671 | +int vfsub_sio_rmdir(struct inode *dir, struct path *path); | |
23672 | +int vfsub_sio_notify_change(struct path *path, struct iattr *ia); | |
23673 | +int vfsub_notify_change(struct path *path, struct iattr *ia); | |
23674 | +int vfsub_unlink(struct inode *dir, struct path *path, int force); | |
23675 | + | |
1facf9fc | 23676 | +#endif /* __KERNEL__ */ |
23677 | +#endif /* __AUFS_VFSUB_H__ */ | |
b752ccd1 AM |
23678 | diff -urN /usr/share/empty/fs/aufs/wbr_policy.c linux/fs/aufs/wbr_policy.c |
23679 | --- /usr/share/empty/fs/aufs/wbr_policy.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
23680 | +++ linux/fs/aufs/wbr_policy.c 2010-10-21 09:52:43.096959416 +0200 |
23681 | @@ -0,0 +1,699 @@ | |
1facf9fc | 23682 | +/* |
4a4d8108 | 23683 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 23684 | + * |
23685 | + * This program, aufs is free software; you can redistribute it and/or modify | |
23686 | + * it under the terms of the GNU General Public License as published by | |
23687 | + * the Free Software Foundation; either version 2 of the License, or | |
23688 | + * (at your option) any later version. | |
dece6358 AM |
23689 | + * |
23690 | + * This program is distributed in the hope that it will be useful, | |
23691 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23692 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
23693 | + * GNU General Public License for more details. | |
23694 | + * | |
23695 | + * You should have received a copy of the GNU General Public License | |
23696 | + * along with this program; if not, write to the Free Software | |
23697 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 23698 | + */ |
23699 | + | |
23700 | +/* | |
23701 | + * policies for selecting one among multiple writable branches | |
23702 | + */ | |
23703 | + | |
23704 | +#include <linux/statfs.h> | |
23705 | +#include "aufs.h" | |
23706 | + | |
23707 | +/* subset of cpup_attr() */ | |
23708 | +static noinline_for_stack | |
23709 | +int au_cpdown_attr(struct path *h_path, struct dentry *h_src) | |
23710 | +{ | |
23711 | + int err, sbits; | |
23712 | + struct iattr ia; | |
23713 | + struct inode *h_isrc; | |
23714 | + | |
23715 | + h_isrc = h_src->d_inode; | |
23716 | + ia.ia_valid = ATTR_FORCE | ATTR_MODE | ATTR_UID | ATTR_GID; | |
23717 | + ia.ia_mode = h_isrc->i_mode; | |
23718 | + ia.ia_uid = h_isrc->i_uid; | |
23719 | + ia.ia_gid = h_isrc->i_gid; | |
23720 | + sbits = !!(ia.ia_mode & (S_ISUID | S_ISGID)); | |
23721 | + au_cpup_attr_flags(h_path->dentry->d_inode, h_isrc); | |
23722 | + err = vfsub_sio_notify_change(h_path, &ia); | |
23723 | + | |
23724 | + /* is this nfs only? */ | |
23725 | + if (!err && sbits && au_test_nfs(h_path->dentry->d_sb)) { | |
23726 | + ia.ia_valid = ATTR_FORCE | ATTR_MODE; | |
23727 | + ia.ia_mode = h_isrc->i_mode; | |
23728 | + err = vfsub_sio_notify_change(h_path, &ia); | |
23729 | + } | |
23730 | + | |
23731 | + return err; | |
23732 | +} | |
23733 | + | |
23734 | +#define AuCpdown_PARENT_OPQ 1 | |
23735 | +#define AuCpdown_WHED (1 << 1) | |
23736 | +#define AuCpdown_MADE_DIR (1 << 2) | |
23737 | +#define AuCpdown_DIROPQ (1 << 3) | |
23738 | +#define au_ftest_cpdown(flags, name) ((flags) & AuCpdown_##name) | |
23739 | +#define au_fset_cpdown(flags, name) { (flags) |= AuCpdown_##name; } | |
23740 | +#define au_fclr_cpdown(flags, name) { (flags) &= ~AuCpdown_##name; } | |
23741 | + | |
23742 | +struct au_cpdown_dir_args { | |
23743 | + struct dentry *parent; | |
23744 | + unsigned int flags; | |
23745 | +}; | |
23746 | + | |
23747 | +static int au_cpdown_dir_opq(struct dentry *dentry, aufs_bindex_t bdst, | |
23748 | + struct au_cpdown_dir_args *a) | |
23749 | +{ | |
23750 | + int err; | |
23751 | + struct dentry *opq_dentry; | |
23752 | + | |
23753 | + opq_dentry = au_diropq_create(dentry, bdst); | |
23754 | + err = PTR_ERR(opq_dentry); | |
23755 | + if (IS_ERR(opq_dentry)) | |
23756 | + goto out; | |
23757 | + dput(opq_dentry); | |
23758 | + au_fset_cpdown(a->flags, DIROPQ); | |
23759 | + | |
4f0767ce | 23760 | +out: |
1facf9fc | 23761 | + return err; |
23762 | +} | |
23763 | + | |
23764 | +static int au_cpdown_dir_wh(struct dentry *dentry, struct dentry *h_parent, | |
23765 | + struct inode *dir, aufs_bindex_t bdst) | |
23766 | +{ | |
23767 | + int err; | |
23768 | + struct path h_path; | |
23769 | + struct au_branch *br; | |
23770 | + | |
23771 | + br = au_sbr(dentry->d_sb, bdst); | |
23772 | + h_path.dentry = au_wh_lkup(h_parent, &dentry->d_name, br); | |
23773 | + err = PTR_ERR(h_path.dentry); | |
23774 | + if (IS_ERR(h_path.dentry)) | |
23775 | + goto out; | |
23776 | + | |
23777 | + err = 0; | |
23778 | + if (h_path.dentry->d_inode) { | |
23779 | + h_path.mnt = br->br_mnt; | |
23780 | + err = au_wh_unlink_dentry(au_h_iptr(dir, bdst), &h_path, | |
23781 | + dentry); | |
23782 | + } | |
23783 | + dput(h_path.dentry); | |
23784 | + | |
4f0767ce | 23785 | +out: |
1facf9fc | 23786 | + return err; |
23787 | +} | |
23788 | + | |
23789 | +static int au_cpdown_dir(struct dentry *dentry, aufs_bindex_t bdst, | |
23790 | + struct dentry *h_parent, void *arg) | |
23791 | +{ | |
23792 | + int err, rerr; | |
4a4d8108 | 23793 | + aufs_bindex_t bopq, bstart; |
1facf9fc | 23794 | + struct path h_path; |
23795 | + struct dentry *parent; | |
23796 | + struct inode *h_dir, *h_inode, *inode, *dir; | |
23797 | + struct au_cpdown_dir_args *args = arg; | |
23798 | + | |
23799 | + bstart = au_dbstart(dentry); | |
23800 | + /* dentry is di-locked */ | |
23801 | + parent = dget_parent(dentry); | |
23802 | + dir = parent->d_inode; | |
23803 | + h_dir = h_parent->d_inode; | |
23804 | + AuDebugOn(h_dir != au_h_iptr(dir, bdst)); | |
23805 | + IMustLock(h_dir); | |
23806 | + | |
23807 | + err = au_lkup_neg(dentry, bdst); | |
23808 | + if (unlikely(err < 0)) | |
23809 | + goto out; | |
23810 | + h_path.dentry = au_h_dptr(dentry, bdst); | |
23811 | + h_path.mnt = au_sbr_mnt(dentry->d_sb, bdst); | |
23812 | + err = vfsub_sio_mkdir(au_h_iptr(dir, bdst), &h_path, | |
23813 | + S_IRWXU | S_IRUGO | S_IXUGO); | |
23814 | + if (unlikely(err)) | |
23815 | + goto out_put; | |
23816 | + au_fset_cpdown(args->flags, MADE_DIR); | |
23817 | + | |
1facf9fc | 23818 | + bopq = au_dbdiropq(dentry); |
23819 | + au_fclr_cpdown(args->flags, WHED); | |
23820 | + au_fclr_cpdown(args->flags, DIROPQ); | |
23821 | + if (au_dbwh(dentry) == bdst) | |
23822 | + au_fset_cpdown(args->flags, WHED); | |
23823 | + if (!au_ftest_cpdown(args->flags, PARENT_OPQ) && bopq <= bdst) | |
23824 | + au_fset_cpdown(args->flags, PARENT_OPQ); | |
1facf9fc | 23825 | + h_inode = h_path.dentry->d_inode; |
23826 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); | |
23827 | + if (au_ftest_cpdown(args->flags, WHED)) { | |
23828 | + err = au_cpdown_dir_opq(dentry, bdst, args); | |
23829 | + if (unlikely(err)) { | |
23830 | + mutex_unlock(&h_inode->i_mutex); | |
23831 | + goto out_dir; | |
23832 | + } | |
23833 | + } | |
23834 | + | |
23835 | + err = au_cpdown_attr(&h_path, au_h_dptr(dentry, bstart)); | |
23836 | + mutex_unlock(&h_inode->i_mutex); | |
23837 | + if (unlikely(err)) | |
23838 | + goto out_opq; | |
23839 | + | |
23840 | + if (au_ftest_cpdown(args->flags, WHED)) { | |
23841 | + err = au_cpdown_dir_wh(dentry, h_parent, dir, bdst); | |
23842 | + if (unlikely(err)) | |
23843 | + goto out_opq; | |
23844 | + } | |
23845 | + | |
23846 | + inode = dentry->d_inode; | |
23847 | + if (au_ibend(inode) < bdst) | |
23848 | + au_set_ibend(inode, bdst); | |
23849 | + au_set_h_iptr(inode, bdst, au_igrab(h_inode), | |
23850 | + au_hi_flags(inode, /*isdir*/1)); | |
23851 | + goto out; /* success */ | |
23852 | + | |
23853 | + /* revert */ | |
4f0767ce | 23854 | +out_opq: |
1facf9fc | 23855 | + if (au_ftest_cpdown(args->flags, DIROPQ)) { |
23856 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); | |
23857 | + rerr = au_diropq_remove(dentry, bdst); | |
23858 | + mutex_unlock(&h_inode->i_mutex); | |
23859 | + if (unlikely(rerr)) { | |
23860 | + AuIOErr("failed removing diropq for %.*s b%d (%d)\n", | |
23861 | + AuDLNPair(dentry), bdst, rerr); | |
23862 | + err = -EIO; | |
23863 | + goto out; | |
23864 | + } | |
23865 | + } | |
4f0767ce | 23866 | +out_dir: |
1facf9fc | 23867 | + if (au_ftest_cpdown(args->flags, MADE_DIR)) { |
23868 | + rerr = vfsub_sio_rmdir(au_h_iptr(dir, bdst), &h_path); | |
23869 | + if (unlikely(rerr)) { | |
23870 | + AuIOErr("failed removing %.*s b%d (%d)\n", | |
23871 | + AuDLNPair(dentry), bdst, rerr); | |
23872 | + err = -EIO; | |
23873 | + } | |
23874 | + } | |
4f0767ce | 23875 | +out_put: |
1facf9fc | 23876 | + au_set_h_dptr(dentry, bdst, NULL); |
23877 | + if (au_dbend(dentry) == bdst) | |
23878 | + au_update_dbend(dentry); | |
4f0767ce | 23879 | +out: |
1facf9fc | 23880 | + dput(parent); |
23881 | + return err; | |
23882 | +} | |
23883 | + | |
23884 | +int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst) | |
23885 | +{ | |
23886 | + int err; | |
23887 | + struct au_cpdown_dir_args args = { | |
23888 | + .parent = dget_parent(dentry), | |
23889 | + .flags = 0 | |
23890 | + }; | |
23891 | + | |
23892 | + err = au_cp_dirs(dentry, bdst, au_cpdown_dir, &args); | |
23893 | + dput(args.parent); | |
23894 | + | |
23895 | + return err; | |
23896 | +} | |
23897 | + | |
23898 | +/* ---------------------------------------------------------------------- */ | |
23899 | + | |
23900 | +/* policies for create */ | |
23901 | + | |
4a4d8108 AM |
23902 | +static int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex) |
23903 | +{ | |
23904 | + int err, i, j, ndentry; | |
23905 | + aufs_bindex_t bopq; | |
23906 | + struct au_dcsub_pages dpages; | |
23907 | + struct au_dpage *dpage; | |
23908 | + struct dentry **dentries, *parent, *d; | |
23909 | + | |
23910 | + err = au_dpages_init(&dpages, GFP_NOFS); | |
23911 | + if (unlikely(err)) | |
23912 | + goto out; | |
23913 | + parent = dget_parent(dentry); | |
23914 | + err = au_dcsub_pages_rev(&dpages, parent, /*do_include*/0, /*test*/NULL, | |
23915 | + /*arg*/NULL); | |
23916 | + if (unlikely(err)) | |
23917 | + goto out_free; | |
23918 | + | |
23919 | + err = bindex; | |
23920 | + for (i = 0; i < dpages.ndpage; i++) { | |
23921 | + dpage = dpages.dpages + i; | |
23922 | + dentries = dpage->dentries; | |
23923 | + ndentry = dpage->ndentry; | |
23924 | + for (j = 0; j < ndentry; j++) { | |
23925 | + d = dentries[j]; | |
23926 | + di_read_lock_parent2(d, !AuLock_IR); | |
23927 | + bopq = au_dbdiropq(d); | |
23928 | + di_read_unlock(d, !AuLock_IR); | |
23929 | + if (bopq >= 0 && bopq < err) | |
23930 | + err = bopq; | |
23931 | + } | |
23932 | + } | |
23933 | + | |
23934 | +out_free: | |
23935 | + dput(parent); | |
23936 | + au_dpages_free(&dpages); | |
23937 | +out: | |
23938 | + return err; | |
23939 | +} | |
23940 | + | |
1facf9fc | 23941 | +static int au_wbr_bu(struct super_block *sb, aufs_bindex_t bindex) |
23942 | +{ | |
23943 | + for (; bindex >= 0; bindex--) | |
23944 | + if (!au_br_rdonly(au_sbr(sb, bindex))) | |
23945 | + return bindex; | |
23946 | + return -EROFS; | |
23947 | +} | |
23948 | + | |
23949 | +/* top down parent */ | |
23950 | +static int au_wbr_create_tdp(struct dentry *dentry, int isdir __maybe_unused) | |
23951 | +{ | |
23952 | + int err; | |
23953 | + aufs_bindex_t bstart, bindex; | |
23954 | + struct super_block *sb; | |
23955 | + struct dentry *parent, *h_parent; | |
23956 | + | |
23957 | + sb = dentry->d_sb; | |
23958 | + bstart = au_dbstart(dentry); | |
23959 | + err = bstart; | |
23960 | + if (!au_br_rdonly(au_sbr(sb, bstart))) | |
23961 | + goto out; | |
23962 | + | |
23963 | + err = -EROFS; | |
23964 | + parent = dget_parent(dentry); | |
23965 | + for (bindex = au_dbstart(parent); bindex < bstart; bindex++) { | |
23966 | + h_parent = au_h_dptr(parent, bindex); | |
23967 | + if (!h_parent || !h_parent->d_inode) | |
23968 | + continue; | |
23969 | + | |
23970 | + if (!au_br_rdonly(au_sbr(sb, bindex))) { | |
23971 | + err = bindex; | |
23972 | + break; | |
23973 | + } | |
23974 | + } | |
23975 | + dput(parent); | |
23976 | + | |
23977 | + /* bottom up here */ | |
4a4d8108 | 23978 | + if (unlikely(err < 0)) { |
1facf9fc | 23979 | + err = au_wbr_bu(sb, bstart - 1); |
4a4d8108 AM |
23980 | + if (err >= 0) |
23981 | + err = au_wbr_nonopq(dentry, err); | |
23982 | + } | |
1facf9fc | 23983 | + |
4f0767ce | 23984 | +out: |
1facf9fc | 23985 | + AuDbg("b%d\n", err); |
23986 | + return err; | |
23987 | +} | |
23988 | + | |
23989 | +/* ---------------------------------------------------------------------- */ | |
23990 | + | |
23991 | +/* an exception for the policy other than tdp */ | |
23992 | +static int au_wbr_create_exp(struct dentry *dentry) | |
23993 | +{ | |
23994 | + int err; | |
23995 | + aufs_bindex_t bwh, bdiropq; | |
23996 | + struct dentry *parent; | |
23997 | + | |
23998 | + err = -1; | |
23999 | + bwh = au_dbwh(dentry); | |
24000 | + parent = dget_parent(dentry); | |
24001 | + bdiropq = au_dbdiropq(parent); | |
24002 | + if (bwh >= 0) { | |
24003 | + if (bdiropq >= 0) | |
24004 | + err = min(bdiropq, bwh); | |
24005 | + else | |
24006 | + err = bwh; | |
24007 | + AuDbg("%d\n", err); | |
24008 | + } else if (bdiropq >= 0) { | |
24009 | + err = bdiropq; | |
24010 | + AuDbg("%d\n", err); | |
24011 | + } | |
24012 | + dput(parent); | |
24013 | + | |
4a4d8108 AM |
24014 | + if (err >= 0) |
24015 | + err = au_wbr_nonopq(dentry, err); | |
24016 | + | |
1facf9fc | 24017 | + if (err >= 0 && au_br_rdonly(au_sbr(dentry->d_sb, err))) |
24018 | + err = -1; | |
24019 | + | |
24020 | + AuDbg("%d\n", err); | |
24021 | + return err; | |
24022 | +} | |
24023 | + | |
24024 | +/* ---------------------------------------------------------------------- */ | |
24025 | + | |
24026 | +/* round robin */ | |
24027 | +static int au_wbr_create_init_rr(struct super_block *sb) | |
24028 | +{ | |
24029 | + int err; | |
24030 | + | |
24031 | + err = au_wbr_bu(sb, au_sbend(sb)); | |
24032 | + atomic_set(&au_sbi(sb)->si_wbr_rr_next, -err); /* less important */ | |
dece6358 | 24033 | + /* smp_mb(); */ |
1facf9fc | 24034 | + |
24035 | + AuDbg("b%d\n", err); | |
24036 | + return err; | |
24037 | +} | |
24038 | + | |
24039 | +static int au_wbr_create_rr(struct dentry *dentry, int isdir) | |
24040 | +{ | |
24041 | + int err, nbr; | |
24042 | + unsigned int u; | |
24043 | + aufs_bindex_t bindex, bend; | |
24044 | + struct super_block *sb; | |
24045 | + atomic_t *next; | |
24046 | + | |
24047 | + err = au_wbr_create_exp(dentry); | |
24048 | + if (err >= 0) | |
24049 | + goto out; | |
24050 | + | |
24051 | + sb = dentry->d_sb; | |
24052 | + next = &au_sbi(sb)->si_wbr_rr_next; | |
24053 | + bend = au_sbend(sb); | |
24054 | + nbr = bend + 1; | |
24055 | + for (bindex = 0; bindex <= bend; bindex++) { | |
24056 | + if (!isdir) { | |
24057 | + err = atomic_dec_return(next) + 1; | |
24058 | + /* modulo for 0 is meaningless */ | |
24059 | + if (unlikely(!err)) | |
24060 | + err = atomic_dec_return(next) + 1; | |
24061 | + } else | |
24062 | + err = atomic_read(next); | |
24063 | + AuDbg("%d\n", err); | |
24064 | + u = err; | |
24065 | + err = u % nbr; | |
24066 | + AuDbg("%d\n", err); | |
24067 | + if (!au_br_rdonly(au_sbr(sb, err))) | |
24068 | + break; | |
24069 | + err = -EROFS; | |
24070 | + } | |
24071 | + | |
4a4d8108 AM |
24072 | + if (err >= 0) |
24073 | + err = au_wbr_nonopq(dentry, err); | |
24074 | + | |
4f0767ce | 24075 | +out: |
1facf9fc | 24076 | + AuDbg("%d\n", err); |
24077 | + return err; | |
24078 | +} | |
24079 | + | |
24080 | +/* ---------------------------------------------------------------------- */ | |
24081 | + | |
24082 | +/* most free space */ | |
24083 | +static void au_mfs(struct dentry *dentry) | |
24084 | +{ | |
24085 | + struct super_block *sb; | |
24086 | + struct au_branch *br; | |
24087 | + struct au_wbr_mfs *mfs; | |
24088 | + aufs_bindex_t bindex, bend; | |
24089 | + int err; | |
24090 | + unsigned long long b, bavail; | |
953406b4 | 24091 | + struct path h_path; |
1facf9fc | 24092 | + /* reduce the stack usage */ |
24093 | + struct kstatfs *st; | |
24094 | + | |
24095 | + st = kmalloc(sizeof(*st), GFP_NOFS); | |
24096 | + if (unlikely(!st)) { | |
24097 | + AuWarn1("failed updating mfs(%d), ignored\n", -ENOMEM); | |
24098 | + return; | |
24099 | + } | |
24100 | + | |
24101 | + bavail = 0; | |
24102 | + sb = dentry->d_sb; | |
24103 | + mfs = &au_sbi(sb)->si_wbr_mfs; | |
dece6358 | 24104 | + MtxMustLock(&mfs->mfs_lock); |
1facf9fc | 24105 | + mfs->mfs_bindex = -EROFS; |
24106 | + mfs->mfsrr_bytes = 0; | |
24107 | + bend = au_sbend(sb); | |
24108 | + for (bindex = 0; bindex <= bend; bindex++) { | |
24109 | + br = au_sbr(sb, bindex); | |
24110 | + if (au_br_rdonly(br)) | |
24111 | + continue; | |
24112 | + | |
24113 | + /* sb->s_root for NFS is unreliable */ | |
953406b4 AM |
24114 | + h_path.mnt = br->br_mnt; |
24115 | + h_path.dentry = h_path.mnt->mnt_root; | |
24116 | + err = vfs_statfs(&h_path, st); | |
1facf9fc | 24117 | + if (unlikely(err)) { |
24118 | + AuWarn1("failed statfs, b%d, %d\n", bindex, err); | |
24119 | + continue; | |
24120 | + } | |
24121 | + | |
24122 | + /* when the available size is equal, select the lower one */ | |
24123 | + BUILD_BUG_ON(sizeof(b) < sizeof(st->f_bavail) | |
24124 | + || sizeof(b) < sizeof(st->f_bsize)); | |
24125 | + b = st->f_bavail * st->f_bsize; | |
24126 | + br->br_wbr->wbr_bytes = b; | |
24127 | + if (b >= bavail) { | |
24128 | + bavail = b; | |
24129 | + mfs->mfs_bindex = bindex; | |
24130 | + mfs->mfs_jiffy = jiffies; | |
24131 | + } | |
24132 | + } | |
24133 | + | |
24134 | + mfs->mfsrr_bytes = bavail; | |
24135 | + AuDbg("b%d\n", mfs->mfs_bindex); | |
24136 | + kfree(st); | |
24137 | +} | |
24138 | + | |
24139 | +static int au_wbr_create_mfs(struct dentry *dentry, int isdir __maybe_unused) | |
24140 | +{ | |
24141 | + int err; | |
24142 | + struct super_block *sb; | |
24143 | + struct au_wbr_mfs *mfs; | |
24144 | + | |
24145 | + err = au_wbr_create_exp(dentry); | |
24146 | + if (err >= 0) | |
24147 | + goto out; | |
24148 | + | |
24149 | + sb = dentry->d_sb; | |
24150 | + mfs = &au_sbi(sb)->si_wbr_mfs; | |
24151 | + mutex_lock(&mfs->mfs_lock); | |
24152 | + if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire) | |
24153 | + || mfs->mfs_bindex < 0 | |
24154 | + || au_br_rdonly(au_sbr(sb, mfs->mfs_bindex))) | |
24155 | + au_mfs(dentry); | |
24156 | + mutex_unlock(&mfs->mfs_lock); | |
24157 | + err = mfs->mfs_bindex; | |
24158 | + | |
4a4d8108 AM |
24159 | + if (err >= 0) |
24160 | + err = au_wbr_nonopq(dentry, err); | |
24161 | + | |
4f0767ce | 24162 | +out: |
1facf9fc | 24163 | + AuDbg("b%d\n", err); |
24164 | + return err; | |
24165 | +} | |
24166 | + | |
24167 | +static int au_wbr_create_init_mfs(struct super_block *sb) | |
24168 | +{ | |
24169 | + struct au_wbr_mfs *mfs; | |
24170 | + | |
24171 | + mfs = &au_sbi(sb)->si_wbr_mfs; | |
24172 | + mutex_init(&mfs->mfs_lock); | |
24173 | + mfs->mfs_jiffy = 0; | |
24174 | + mfs->mfs_bindex = -EROFS; | |
24175 | + | |
24176 | + return 0; | |
24177 | +} | |
24178 | + | |
24179 | +static int au_wbr_create_fin_mfs(struct super_block *sb __maybe_unused) | |
24180 | +{ | |
24181 | + mutex_destroy(&au_sbi(sb)->si_wbr_mfs.mfs_lock); | |
24182 | + return 0; | |
24183 | +} | |
24184 | + | |
24185 | +/* ---------------------------------------------------------------------- */ | |
24186 | + | |
24187 | +/* most free space and then round robin */ | |
24188 | +static int au_wbr_create_mfsrr(struct dentry *dentry, int isdir) | |
24189 | +{ | |
24190 | + int err; | |
24191 | + struct au_wbr_mfs *mfs; | |
24192 | + | |
24193 | + err = au_wbr_create_mfs(dentry, isdir); | |
24194 | + if (err >= 0) { | |
24195 | + mfs = &au_sbi(dentry->d_sb)->si_wbr_mfs; | |
dece6358 | 24196 | + mutex_lock(&mfs->mfs_lock); |
1facf9fc | 24197 | + if (mfs->mfsrr_bytes < mfs->mfsrr_watermark) |
24198 | + err = au_wbr_create_rr(dentry, isdir); | |
dece6358 | 24199 | + mutex_unlock(&mfs->mfs_lock); |
1facf9fc | 24200 | + } |
24201 | + | |
24202 | + AuDbg("b%d\n", err); | |
24203 | + return err; | |
24204 | +} | |
24205 | + | |
24206 | +static int au_wbr_create_init_mfsrr(struct super_block *sb) | |
24207 | +{ | |
24208 | + int err; | |
24209 | + | |
24210 | + au_wbr_create_init_mfs(sb); /* ignore */ | |
24211 | + err = au_wbr_create_init_rr(sb); | |
24212 | + | |
24213 | + return err; | |
24214 | +} | |
24215 | + | |
24216 | +/* ---------------------------------------------------------------------- */ | |
24217 | + | |
24218 | +/* top down parent and most free space */ | |
24219 | +static int au_wbr_create_pmfs(struct dentry *dentry, int isdir) | |
24220 | +{ | |
24221 | + int err, e2; | |
24222 | + unsigned long long b; | |
24223 | + aufs_bindex_t bindex, bstart, bend; | |
24224 | + struct super_block *sb; | |
24225 | + struct dentry *parent, *h_parent; | |
24226 | + struct au_branch *br; | |
24227 | + | |
24228 | + err = au_wbr_create_tdp(dentry, isdir); | |
24229 | + if (unlikely(err < 0)) | |
24230 | + goto out; | |
24231 | + parent = dget_parent(dentry); | |
24232 | + bstart = au_dbstart(parent); | |
24233 | + bend = au_dbtaildir(parent); | |
24234 | + if (bstart == bend) | |
24235 | + goto out_parent; /* success */ | |
24236 | + | |
24237 | + e2 = au_wbr_create_mfs(dentry, isdir); | |
24238 | + if (e2 < 0) | |
24239 | + goto out_parent; /* success */ | |
24240 | + | |
24241 | + /* when the available size is equal, select upper one */ | |
24242 | + sb = dentry->d_sb; | |
24243 | + br = au_sbr(sb, err); | |
24244 | + b = br->br_wbr->wbr_bytes; | |
24245 | + AuDbg("b%d, %llu\n", err, b); | |
24246 | + | |
24247 | + for (bindex = bstart; bindex <= bend; bindex++) { | |
24248 | + h_parent = au_h_dptr(parent, bindex); | |
24249 | + if (!h_parent || !h_parent->d_inode) | |
24250 | + continue; | |
24251 | + | |
24252 | + br = au_sbr(sb, bindex); | |
24253 | + if (!au_br_rdonly(br) && br->br_wbr->wbr_bytes > b) { | |
24254 | + b = br->br_wbr->wbr_bytes; | |
24255 | + err = bindex; | |
24256 | + AuDbg("b%d, %llu\n", err, b); | |
24257 | + } | |
24258 | + } | |
24259 | + | |
4a4d8108 AM |
24260 | + if (err >= 0) |
24261 | + err = au_wbr_nonopq(dentry, err); | |
24262 | + | |
4f0767ce | 24263 | +out_parent: |
1facf9fc | 24264 | + dput(parent); |
4f0767ce | 24265 | +out: |
1facf9fc | 24266 | + AuDbg("b%d\n", err); |
24267 | + return err; | |
24268 | +} | |
24269 | + | |
24270 | +/* ---------------------------------------------------------------------- */ | |
24271 | + | |
24272 | +/* policies for copyup */ | |
24273 | + | |
24274 | +/* top down parent */ | |
24275 | +static int au_wbr_copyup_tdp(struct dentry *dentry) | |
24276 | +{ | |
24277 | + return au_wbr_create_tdp(dentry, /*isdir, anything is ok*/0); | |
24278 | +} | |
24279 | + | |
24280 | +/* bottom up parent */ | |
24281 | +static int au_wbr_copyup_bup(struct dentry *dentry) | |
24282 | +{ | |
24283 | + int err; | |
24284 | + aufs_bindex_t bindex, bstart; | |
24285 | + struct dentry *parent, *h_parent; | |
24286 | + struct super_block *sb; | |
24287 | + | |
24288 | + err = -EROFS; | |
24289 | + sb = dentry->d_sb; | |
24290 | + parent = dget_parent(dentry); | |
24291 | + bstart = au_dbstart(parent); | |
24292 | + for (bindex = au_dbstart(dentry); bindex >= bstart; bindex--) { | |
24293 | + h_parent = au_h_dptr(parent, bindex); | |
24294 | + if (!h_parent || !h_parent->d_inode) | |
24295 | + continue; | |
24296 | + | |
24297 | + if (!au_br_rdonly(au_sbr(sb, bindex))) { | |
24298 | + err = bindex; | |
24299 | + break; | |
24300 | + } | |
24301 | + } | |
24302 | + dput(parent); | |
24303 | + | |
24304 | + /* bottom up here */ | |
24305 | + if (unlikely(err < 0)) | |
24306 | + err = au_wbr_bu(sb, bstart - 1); | |
24307 | + | |
24308 | + AuDbg("b%d\n", err); | |
24309 | + return err; | |
24310 | +} | |
24311 | + | |
24312 | +/* bottom up */ | |
24313 | +static int au_wbr_copyup_bu(struct dentry *dentry) | |
24314 | +{ | |
24315 | + int err; | |
4a4d8108 | 24316 | + aufs_bindex_t bstart; |
1facf9fc | 24317 | + |
4a4d8108 AM |
24318 | + bstart = au_dbstart(dentry); |
24319 | + err = au_wbr_bu(dentry->d_sb, bstart); | |
24320 | + AuDbg("b%d\n", err); | |
24321 | + if (err > bstart) | |
24322 | + err = au_wbr_nonopq(dentry, err); | |
1facf9fc | 24323 | + |
24324 | + AuDbg("b%d\n", err); | |
24325 | + return err; | |
24326 | +} | |
24327 | + | |
24328 | +/* ---------------------------------------------------------------------- */ | |
24329 | + | |
24330 | +struct au_wbr_copyup_operations au_wbr_copyup_ops[] = { | |
24331 | + [AuWbrCopyup_TDP] = { | |
24332 | + .copyup = au_wbr_copyup_tdp | |
24333 | + }, | |
24334 | + [AuWbrCopyup_BUP] = { | |
24335 | + .copyup = au_wbr_copyup_bup | |
24336 | + }, | |
24337 | + [AuWbrCopyup_BU] = { | |
24338 | + .copyup = au_wbr_copyup_bu | |
24339 | + } | |
24340 | +}; | |
24341 | + | |
24342 | +struct au_wbr_create_operations au_wbr_create_ops[] = { | |
24343 | + [AuWbrCreate_TDP] = { | |
24344 | + .create = au_wbr_create_tdp | |
24345 | + }, | |
24346 | + [AuWbrCreate_RR] = { | |
24347 | + .create = au_wbr_create_rr, | |
24348 | + .init = au_wbr_create_init_rr | |
24349 | + }, | |
24350 | + [AuWbrCreate_MFS] = { | |
24351 | + .create = au_wbr_create_mfs, | |
24352 | + .init = au_wbr_create_init_mfs, | |
24353 | + .fin = au_wbr_create_fin_mfs | |
24354 | + }, | |
24355 | + [AuWbrCreate_MFSV] = { | |
24356 | + .create = au_wbr_create_mfs, | |
24357 | + .init = au_wbr_create_init_mfs, | |
24358 | + .fin = au_wbr_create_fin_mfs | |
24359 | + }, | |
24360 | + [AuWbrCreate_MFSRR] = { | |
24361 | + .create = au_wbr_create_mfsrr, | |
24362 | + .init = au_wbr_create_init_mfsrr, | |
24363 | + .fin = au_wbr_create_fin_mfs | |
24364 | + }, | |
24365 | + [AuWbrCreate_MFSRRV] = { | |
24366 | + .create = au_wbr_create_mfsrr, | |
24367 | + .init = au_wbr_create_init_mfsrr, | |
24368 | + .fin = au_wbr_create_fin_mfs | |
24369 | + }, | |
24370 | + [AuWbrCreate_PMFS] = { | |
24371 | + .create = au_wbr_create_pmfs, | |
24372 | + .init = au_wbr_create_init_mfs, | |
24373 | + .fin = au_wbr_create_fin_mfs | |
24374 | + }, | |
24375 | + [AuWbrCreate_PMFSV] = { | |
24376 | + .create = au_wbr_create_pmfs, | |
24377 | + .init = au_wbr_create_init_mfs, | |
24378 | + .fin = au_wbr_create_fin_mfs | |
24379 | + } | |
24380 | +}; | |
b752ccd1 AM |
24381 | diff -urN /usr/share/empty/fs/aufs/whout.c linux/fs/aufs/whout.c |
24382 | --- /usr/share/empty/fs/aufs/whout.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
24383 | +++ linux/fs/aufs/whout.c 2010-10-21 09:52:43.096959416 +0200 |
24384 | @@ -0,0 +1,1052 @@ | |
1facf9fc | 24385 | +/* |
4a4d8108 | 24386 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 24387 | + * |
24388 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24389 | + * it under the terms of the GNU General Public License as published by | |
24390 | + * the Free Software Foundation; either version 2 of the License, or | |
24391 | + * (at your option) any later version. | |
dece6358 AM |
24392 | + * |
24393 | + * This program is distributed in the hope that it will be useful, | |
24394 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24395 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24396 | + * GNU General Public License for more details. | |
24397 | + * | |
24398 | + * You should have received a copy of the GNU General Public License | |
24399 | + * along with this program; if not, write to the Free Software | |
24400 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 24401 | + */ |
24402 | + | |
24403 | +/* | |
24404 | + * whiteout for logical deletion and opaque directory | |
24405 | + */ | |
24406 | + | |
24407 | +#include <linux/fs.h> | |
24408 | +#include "aufs.h" | |
24409 | + | |
24410 | +#define WH_MASK S_IRUGO | |
24411 | + | |
24412 | +/* | |
24413 | + * If a directory contains this file, then it is opaque. We start with the | |
24414 | + * .wh. flag so that it is blocked by lookup. | |
24415 | + */ | |
24416 | +static struct qstr diropq_name = { | |
24417 | + .name = AUFS_WH_DIROPQ, | |
24418 | + .len = sizeof(AUFS_WH_DIROPQ) - 1 | |
24419 | +}; | |
24420 | + | |
24421 | +/* | |
24422 | + * generate whiteout name, which is NOT terminated by NULL. | |
24423 | + * @name: original d_name.name | |
24424 | + * @len: original d_name.len | |
24425 | + * @wh: whiteout qstr | |
24426 | + * returns zero when succeeds, otherwise error. | |
24427 | + * succeeded value as wh->name should be freed by kfree(). | |
24428 | + */ | |
24429 | +int au_wh_name_alloc(struct qstr *wh, const struct qstr *name) | |
24430 | +{ | |
24431 | + char *p; | |
24432 | + | |
24433 | + if (unlikely(name->len > PATH_MAX - AUFS_WH_PFX_LEN)) | |
24434 | + return -ENAMETOOLONG; | |
24435 | + | |
24436 | + wh->len = name->len + AUFS_WH_PFX_LEN; | |
24437 | + p = kmalloc(wh->len, GFP_NOFS); | |
24438 | + wh->name = p; | |
24439 | + if (p) { | |
24440 | + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); | |
24441 | + memcpy(p + AUFS_WH_PFX_LEN, name->name, name->len); | |
24442 | + /* smp_mb(); */ | |
24443 | + return 0; | |
24444 | + } | |
24445 | + return -ENOMEM; | |
24446 | +} | |
24447 | + | |
24448 | +/* ---------------------------------------------------------------------- */ | |
24449 | + | |
24450 | +/* | |
24451 | + * test if the @wh_name exists under @h_parent. | |
24452 | + * @try_sio specifies the necessary of super-io. | |
24453 | + */ | |
24454 | +int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, | |
24455 | + struct au_branch *br, int try_sio) | |
24456 | +{ | |
24457 | + int err; | |
24458 | + struct dentry *wh_dentry; | |
1facf9fc | 24459 | + |
1facf9fc | 24460 | + if (!try_sio) |
24461 | + wh_dentry = au_lkup_one(wh_name, h_parent, br, /*nd*/NULL); | |
24462 | + else | |
24463 | + wh_dentry = au_sio_lkup_one(wh_name, h_parent, br); | |
24464 | + err = PTR_ERR(wh_dentry); | |
24465 | + if (IS_ERR(wh_dentry)) | |
24466 | + goto out; | |
24467 | + | |
24468 | + err = 0; | |
24469 | + if (!wh_dentry->d_inode) | |
24470 | + goto out_wh; /* success */ | |
24471 | + | |
24472 | + err = 1; | |
24473 | + if (S_ISREG(wh_dentry->d_inode->i_mode)) | |
24474 | + goto out_wh; /* success */ | |
24475 | + | |
24476 | + err = -EIO; | |
24477 | + AuIOErr("%.*s Invalid whiteout entry type 0%o.\n", | |
24478 | + AuDLNPair(wh_dentry), wh_dentry->d_inode->i_mode); | |
24479 | + | |
4f0767ce | 24480 | +out_wh: |
1facf9fc | 24481 | + dput(wh_dentry); |
4f0767ce | 24482 | +out: |
1facf9fc | 24483 | + return err; |
24484 | +} | |
24485 | + | |
24486 | +/* | |
24487 | + * test if the @h_dentry sets opaque or not. | |
24488 | + */ | |
24489 | +int au_diropq_test(struct dentry *h_dentry, struct au_branch *br) | |
24490 | +{ | |
24491 | + int err; | |
24492 | + struct inode *h_dir; | |
24493 | + | |
24494 | + h_dir = h_dentry->d_inode; | |
24495 | + err = au_wh_test(h_dentry, &diropq_name, br, | |
24496 | + au_test_h_perm_sio(h_dir, MAY_EXEC)); | |
24497 | + return err; | |
24498 | +} | |
24499 | + | |
24500 | +/* | |
24501 | + * returns a negative dentry whose name is unique and temporary. | |
24502 | + */ | |
24503 | +struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br, | |
24504 | + struct qstr *prefix) | |
24505 | +{ | |
1facf9fc | 24506 | + struct dentry *dentry; |
24507 | + int i; | |
4a4d8108 AM |
24508 | + char defname[NAME_MAX - AUFS_MAX_NAMELEN + DNAME_INLINE_LEN_MIN + 1], |
24509 | + *name, *p; | |
1facf9fc | 24510 | + static unsigned short cnt; |
24511 | + struct qstr qs; | |
24512 | + | |
4a4d8108 AM |
24513 | + BUILD_BUG_ON(sizeof(cnt) * 2 > AUFS_WH_TMP_LEN); |
24514 | + | |
1facf9fc | 24515 | + name = defname; |
24516 | + qs.len = sizeof(defname) - DNAME_INLINE_LEN_MIN + prefix->len - 1; | |
24517 | + if (unlikely(prefix->len > DNAME_INLINE_LEN_MIN)) { | |
24518 | + dentry = ERR_PTR(-ENAMETOOLONG); | |
4a4d8108 | 24519 | + if (unlikely(qs.len > NAME_MAX)) |
1facf9fc | 24520 | + goto out; |
24521 | + dentry = ERR_PTR(-ENOMEM); | |
24522 | + name = kmalloc(qs.len + 1, GFP_NOFS); | |
24523 | + if (unlikely(!name)) | |
24524 | + goto out; | |
24525 | + } | |
24526 | + | |
24527 | + /* doubly whiteout-ed */ | |
24528 | + memcpy(name, AUFS_WH_PFX AUFS_WH_PFX, AUFS_WH_PFX_LEN * 2); | |
24529 | + p = name + AUFS_WH_PFX_LEN * 2; | |
24530 | + memcpy(p, prefix->name, prefix->len); | |
24531 | + p += prefix->len; | |
24532 | + *p++ = '.'; | |
4a4d8108 | 24533 | + AuDebugOn(name + qs.len + 1 - p <= AUFS_WH_TMP_LEN); |
1facf9fc | 24534 | + |
24535 | + qs.name = name; | |
24536 | + for (i = 0; i < 3; i++) { | |
b752ccd1 | 24537 | + sprintf(p, "%.*x", AUFS_WH_TMP_LEN, cnt++); |
1facf9fc | 24538 | + dentry = au_sio_lkup_one(&qs, h_parent, br); |
24539 | + if (IS_ERR(dentry) || !dentry->d_inode) | |
24540 | + goto out_name; | |
24541 | + dput(dentry); | |
24542 | + } | |
4a4d8108 | 24543 | + /* pr_warning("could not get random name\n"); */ |
1facf9fc | 24544 | + dentry = ERR_PTR(-EEXIST); |
24545 | + AuDbg("%.*s\n", AuLNPair(&qs)); | |
24546 | + BUG(); | |
24547 | + | |
4f0767ce | 24548 | +out_name: |
1facf9fc | 24549 | + if (name != defname) |
24550 | + kfree(name); | |
4f0767ce | 24551 | +out: |
4a4d8108 | 24552 | + AuTraceErrPtr(dentry); |
1facf9fc | 24553 | + return dentry; |
1facf9fc | 24554 | +} |
24555 | + | |
24556 | +/* | |
24557 | + * rename the @h_dentry on @br to the whiteouted temporary name. | |
24558 | + */ | |
24559 | +int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br) | |
24560 | +{ | |
24561 | + int err; | |
24562 | + struct path h_path = { | |
24563 | + .mnt = br->br_mnt | |
24564 | + }; | |
24565 | + struct inode *h_dir; | |
24566 | + struct dentry *h_parent; | |
24567 | + | |
24568 | + h_parent = h_dentry->d_parent; /* dir inode is locked */ | |
24569 | + h_dir = h_parent->d_inode; | |
24570 | + IMustLock(h_dir); | |
24571 | + | |
24572 | + h_path.dentry = au_whtmp_lkup(h_parent, br, &h_dentry->d_name); | |
24573 | + err = PTR_ERR(h_path.dentry); | |
24574 | + if (IS_ERR(h_path.dentry)) | |
24575 | + goto out; | |
24576 | + | |
24577 | + /* under the same dir, no need to lock_rename() */ | |
24578 | + err = vfsub_rename(h_dir, h_dentry, h_dir, &h_path); | |
24579 | + AuTraceErr(err); | |
24580 | + dput(h_path.dentry); | |
24581 | + | |
4f0767ce | 24582 | +out: |
4a4d8108 | 24583 | + AuTraceErr(err); |
1facf9fc | 24584 | + return err; |
24585 | +} | |
24586 | + | |
24587 | +/* ---------------------------------------------------------------------- */ | |
24588 | +/* | |
24589 | + * functions for removing a whiteout | |
24590 | + */ | |
24591 | + | |
24592 | +static int do_unlink_wh(struct inode *h_dir, struct path *h_path) | |
24593 | +{ | |
24594 | + int force; | |
24595 | + | |
24596 | + /* | |
24597 | + * forces superio when the dir has a sticky bit. | |
24598 | + * this may be a violation of unix fs semantics. | |
24599 | + */ | |
24600 | + force = (h_dir->i_mode & S_ISVTX) | |
24601 | + && h_path->dentry->d_inode->i_uid != current_fsuid(); | |
24602 | + return vfsub_unlink(h_dir, h_path, force); | |
24603 | +} | |
24604 | + | |
24605 | +int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path, | |
24606 | + struct dentry *dentry) | |
24607 | +{ | |
24608 | + int err; | |
24609 | + | |
24610 | + err = do_unlink_wh(h_dir, h_path); | |
24611 | + if (!err && dentry) | |
24612 | + au_set_dbwh(dentry, -1); | |
24613 | + | |
24614 | + return err; | |
24615 | +} | |
24616 | + | |
24617 | +static int unlink_wh_name(struct dentry *h_parent, struct qstr *wh, | |
24618 | + struct au_branch *br) | |
24619 | +{ | |
24620 | + int err; | |
24621 | + struct path h_path = { | |
24622 | + .mnt = br->br_mnt | |
24623 | + }; | |
24624 | + | |
24625 | + err = 0; | |
24626 | + h_path.dentry = au_lkup_one(wh, h_parent, br, /*nd*/NULL); | |
24627 | + if (IS_ERR(h_path.dentry)) | |
24628 | + err = PTR_ERR(h_path.dentry); | |
24629 | + else { | |
24630 | + if (h_path.dentry->d_inode | |
24631 | + && S_ISREG(h_path.dentry->d_inode->i_mode)) | |
24632 | + err = do_unlink_wh(h_parent->d_inode, &h_path); | |
24633 | + dput(h_path.dentry); | |
24634 | + } | |
24635 | + | |
24636 | + return err; | |
24637 | +} | |
24638 | + | |
24639 | +/* ---------------------------------------------------------------------- */ | |
24640 | +/* | |
24641 | + * initialize/clean whiteout for a branch | |
24642 | + */ | |
24643 | + | |
24644 | +static void au_wh_clean(struct inode *h_dir, struct path *whpath, | |
24645 | + const int isdir) | |
24646 | +{ | |
24647 | + int err; | |
24648 | + | |
24649 | + if (!whpath->dentry->d_inode) | |
24650 | + return; | |
24651 | + | |
24652 | + err = mnt_want_write(whpath->mnt); | |
24653 | + if (!err) { | |
24654 | + if (isdir) | |
24655 | + err = vfsub_rmdir(h_dir, whpath); | |
24656 | + else | |
24657 | + err = vfsub_unlink(h_dir, whpath, /*force*/0); | |
24658 | + mnt_drop_write(whpath->mnt); | |
24659 | + } | |
24660 | + if (unlikely(err)) | |
4a4d8108 AM |
24661 | + pr_warning("failed removing %.*s (%d), ignored.\n", |
24662 | + AuDLNPair(whpath->dentry), err); | |
1facf9fc | 24663 | +} |
24664 | + | |
24665 | +static int test_linkable(struct dentry *h_root) | |
24666 | +{ | |
24667 | + struct inode *h_dir = h_root->d_inode; | |
24668 | + | |
24669 | + if (h_dir->i_op->link) | |
24670 | + return 0; | |
24671 | + | |
4a4d8108 AM |
24672 | + pr_err("%.*s (%s) doesn't support link(2), use noplink and rw+nolwh\n", |
24673 | + AuDLNPair(h_root), au_sbtype(h_root->d_sb)); | |
1facf9fc | 24674 | + return -ENOSYS; |
24675 | +} | |
24676 | + | |
24677 | +/* todo: should this mkdir be done in /sbin/mount.aufs helper? */ | |
24678 | +static int au_whdir(struct inode *h_dir, struct path *path) | |
24679 | +{ | |
24680 | + int err; | |
24681 | + | |
24682 | + err = -EEXIST; | |
24683 | + if (!path->dentry->d_inode) { | |
24684 | + int mode = S_IRWXU; | |
24685 | + | |
24686 | + if (au_test_nfs(path->dentry->d_sb)) | |
24687 | + mode |= S_IXUGO; | |
24688 | + err = mnt_want_write(path->mnt); | |
24689 | + if (!err) { | |
24690 | + err = vfsub_mkdir(h_dir, path, mode); | |
24691 | + mnt_drop_write(path->mnt); | |
24692 | + } | |
24693 | + } else if (S_ISDIR(path->dentry->d_inode->i_mode)) | |
24694 | + err = 0; | |
24695 | + else | |
4a4d8108 | 24696 | + pr_err("unknown %.*s exists\n", AuDLNPair(path->dentry)); |
1facf9fc | 24697 | + |
24698 | + return err; | |
24699 | +} | |
24700 | + | |
24701 | +struct au_wh_base { | |
24702 | + const struct qstr *name; | |
24703 | + struct dentry *dentry; | |
24704 | +}; | |
24705 | + | |
24706 | +static void au_wh_init_ro(struct inode *h_dir, struct au_wh_base base[], | |
24707 | + struct path *h_path) | |
24708 | +{ | |
24709 | + h_path->dentry = base[AuBrWh_BASE].dentry; | |
24710 | + au_wh_clean(h_dir, h_path, /*isdir*/0); | |
24711 | + h_path->dentry = base[AuBrWh_PLINK].dentry; | |
24712 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
24713 | + h_path->dentry = base[AuBrWh_ORPH].dentry; | |
24714 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
24715 | +} | |
24716 | + | |
24717 | +/* | |
24718 | + * returns tri-state, | |
24719 | + * minus: error, caller should print the mesage | |
24720 | + * zero: succuess | |
24721 | + * plus: error, caller should NOT print the mesage | |
24722 | + */ | |
24723 | +static int au_wh_init_rw_nolink(struct dentry *h_root, struct au_wbr *wbr, | |
24724 | + int do_plink, struct au_wh_base base[], | |
24725 | + struct path *h_path) | |
24726 | +{ | |
24727 | + int err; | |
24728 | + struct inode *h_dir; | |
24729 | + | |
24730 | + h_dir = h_root->d_inode; | |
24731 | + h_path->dentry = base[AuBrWh_BASE].dentry; | |
24732 | + au_wh_clean(h_dir, h_path, /*isdir*/0); | |
24733 | + h_path->dentry = base[AuBrWh_PLINK].dentry; | |
24734 | + if (do_plink) { | |
24735 | + err = test_linkable(h_root); | |
24736 | + if (unlikely(err)) { | |
24737 | + err = 1; | |
24738 | + goto out; | |
24739 | + } | |
24740 | + | |
24741 | + err = au_whdir(h_dir, h_path); | |
24742 | + if (unlikely(err)) | |
24743 | + goto out; | |
24744 | + wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry); | |
24745 | + } else | |
24746 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
24747 | + h_path->dentry = base[AuBrWh_ORPH].dentry; | |
24748 | + err = au_whdir(h_dir, h_path); | |
24749 | + if (unlikely(err)) | |
24750 | + goto out; | |
24751 | + wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry); | |
24752 | + | |
4f0767ce | 24753 | +out: |
1facf9fc | 24754 | + return err; |
24755 | +} | |
24756 | + | |
24757 | +/* | |
24758 | + * for the moment, aufs supports the branch filesystem which does not support | |
24759 | + * link(2). testing on FAT which does not support i_op->setattr() fully either, | |
24760 | + * copyup failed. finally, such filesystem will not be used as the writable | |
24761 | + * branch. | |
24762 | + * | |
24763 | + * returns tri-state, see above. | |
24764 | + */ | |
24765 | +static int au_wh_init_rw(struct dentry *h_root, struct au_wbr *wbr, | |
24766 | + int do_plink, struct au_wh_base base[], | |
24767 | + struct path *h_path) | |
24768 | +{ | |
24769 | + int err; | |
24770 | + struct inode *h_dir; | |
24771 | + | |
1308ab2a | 24772 | + WbrWhMustWriteLock(wbr); |
24773 | + | |
1facf9fc | 24774 | + err = test_linkable(h_root); |
24775 | + if (unlikely(err)) { | |
24776 | + err = 1; | |
24777 | + goto out; | |
24778 | + } | |
24779 | + | |
24780 | + /* | |
24781 | + * todo: should this create be done in /sbin/mount.aufs helper? | |
24782 | + */ | |
24783 | + err = -EEXIST; | |
24784 | + h_dir = h_root->d_inode; | |
24785 | + if (!base[AuBrWh_BASE].dentry->d_inode) { | |
24786 | + err = mnt_want_write(h_path->mnt); | |
24787 | + if (!err) { | |
24788 | + h_path->dentry = base[AuBrWh_BASE].dentry; | |
24789 | + err = vfsub_create(h_dir, h_path, WH_MASK); | |
24790 | + mnt_drop_write(h_path->mnt); | |
24791 | + } | |
24792 | + } else if (S_ISREG(base[AuBrWh_BASE].dentry->d_inode->i_mode)) | |
24793 | + err = 0; | |
24794 | + else | |
4a4d8108 AM |
24795 | + pr_err("unknown %.*s/%.*s exists\n", |
24796 | + AuDLNPair(h_root), AuDLNPair(base[AuBrWh_BASE].dentry)); | |
1facf9fc | 24797 | + if (unlikely(err)) |
24798 | + goto out; | |
24799 | + | |
24800 | + h_path->dentry = base[AuBrWh_PLINK].dentry; | |
24801 | + if (do_plink) { | |
24802 | + err = au_whdir(h_dir, h_path); | |
24803 | + if (unlikely(err)) | |
24804 | + goto out; | |
24805 | + wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry); | |
24806 | + } else | |
24807 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
24808 | + wbr->wbr_whbase = dget(base[AuBrWh_BASE].dentry); | |
24809 | + | |
24810 | + h_path->dentry = base[AuBrWh_ORPH].dentry; | |
24811 | + err = au_whdir(h_dir, h_path); | |
24812 | + if (unlikely(err)) | |
24813 | + goto out; | |
24814 | + wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry); | |
24815 | + | |
4f0767ce | 24816 | +out: |
1facf9fc | 24817 | + return err; |
24818 | +} | |
24819 | + | |
24820 | +/* | |
24821 | + * initialize the whiteout base file/dir for @br. | |
24822 | + */ | |
24823 | +int au_wh_init(struct dentry *h_root, struct au_branch *br, | |
24824 | + struct super_block *sb) | |
24825 | +{ | |
24826 | + int err, i; | |
24827 | + const unsigned char do_plink | |
24828 | + = !!au_opt_test(au_mntflags(sb), PLINK); | |
24829 | + struct path path = { | |
24830 | + .mnt = br->br_mnt | |
24831 | + }; | |
24832 | + struct inode *h_dir; | |
24833 | + struct au_wbr *wbr = br->br_wbr; | |
24834 | + static const struct qstr base_name[] = { | |
24835 | + [AuBrWh_BASE] = { | |
24836 | + .name = AUFS_BASE_NAME, | |
24837 | + .len = sizeof(AUFS_BASE_NAME) - 1 | |
24838 | + }, | |
24839 | + [AuBrWh_PLINK] = { | |
24840 | + .name = AUFS_PLINKDIR_NAME, | |
24841 | + .len = sizeof(AUFS_PLINKDIR_NAME) - 1 | |
24842 | + }, | |
24843 | + [AuBrWh_ORPH] = { | |
24844 | + .name = AUFS_ORPHDIR_NAME, | |
24845 | + .len = sizeof(AUFS_ORPHDIR_NAME) - 1 | |
24846 | + } | |
24847 | + }; | |
24848 | + struct au_wh_base base[] = { | |
24849 | + [AuBrWh_BASE] = { | |
24850 | + .name = base_name + AuBrWh_BASE, | |
24851 | + .dentry = NULL | |
24852 | + }, | |
24853 | + [AuBrWh_PLINK] = { | |
24854 | + .name = base_name + AuBrWh_PLINK, | |
24855 | + .dentry = NULL | |
24856 | + }, | |
24857 | + [AuBrWh_ORPH] = { | |
24858 | + .name = base_name + AuBrWh_ORPH, | |
24859 | + .dentry = NULL | |
24860 | + } | |
24861 | + }; | |
24862 | + | |
1308ab2a | 24863 | + if (wbr) |
24864 | + WbrWhMustWriteLock(wbr); | |
1facf9fc | 24865 | + |
1facf9fc | 24866 | + for (i = 0; i < AuBrWh_Last; i++) { |
24867 | + /* doubly whiteouted */ | |
24868 | + struct dentry *d; | |
24869 | + | |
24870 | + d = au_wh_lkup(h_root, (void *)base[i].name, br); | |
24871 | + err = PTR_ERR(d); | |
24872 | + if (IS_ERR(d)) | |
24873 | + goto out; | |
24874 | + | |
24875 | + base[i].dentry = d; | |
24876 | + AuDebugOn(wbr | |
24877 | + && wbr->wbr_wh[i] | |
24878 | + && wbr->wbr_wh[i] != base[i].dentry); | |
24879 | + } | |
24880 | + | |
24881 | + if (wbr) | |
24882 | + for (i = 0; i < AuBrWh_Last; i++) { | |
24883 | + dput(wbr->wbr_wh[i]); | |
24884 | + wbr->wbr_wh[i] = NULL; | |
24885 | + } | |
24886 | + | |
24887 | + err = 0; | |
1facf9fc | 24888 | + switch (br->br_perm) { |
24889 | + case AuBrPerm_RO: | |
24890 | + case AuBrPerm_ROWH: | |
24891 | + case AuBrPerm_RR: | |
24892 | + case AuBrPerm_RRWH: | |
4a4d8108 | 24893 | + h_dir = h_root->d_inode; |
1facf9fc | 24894 | + au_wh_init_ro(h_dir, base, &path); |
24895 | + break; | |
24896 | + | |
24897 | + case AuBrPerm_RWNoLinkWH: | |
24898 | + err = au_wh_init_rw_nolink(h_root, wbr, do_plink, base, &path); | |
24899 | + if (err > 0) | |
24900 | + goto out; | |
24901 | + else if (err) | |
24902 | + goto out_err; | |
24903 | + break; | |
24904 | + | |
24905 | + case AuBrPerm_RW: | |
24906 | + err = au_wh_init_rw(h_root, wbr, do_plink, base, &path); | |
24907 | + if (err > 0) | |
24908 | + goto out; | |
24909 | + else if (err) | |
24910 | + goto out_err; | |
24911 | + break; | |
24912 | + | |
24913 | + default: | |
24914 | + BUG(); | |
24915 | + } | |
24916 | + goto out; /* success */ | |
24917 | + | |
4f0767ce | 24918 | +out_err: |
4a4d8108 AM |
24919 | + pr_err("an error(%d) on the writable branch %.*s(%s)\n", |
24920 | + err, AuDLNPair(h_root), au_sbtype(h_root->d_sb)); | |
4f0767ce | 24921 | +out: |
1facf9fc | 24922 | + for (i = 0; i < AuBrWh_Last; i++) |
24923 | + dput(base[i].dentry); | |
24924 | + return err; | |
24925 | +} | |
24926 | + | |
24927 | +/* ---------------------------------------------------------------------- */ | |
24928 | +/* | |
24929 | + * whiteouts are all hard-linked usually. | |
24930 | + * when its link count reaches a ceiling, we create a new whiteout base | |
24931 | + * asynchronously. | |
24932 | + */ | |
24933 | + | |
24934 | +struct reinit_br_wh { | |
24935 | + struct super_block *sb; | |
24936 | + struct au_branch *br; | |
24937 | +}; | |
24938 | + | |
24939 | +static void reinit_br_wh(void *arg) | |
24940 | +{ | |
24941 | + int err; | |
24942 | + aufs_bindex_t bindex; | |
24943 | + struct path h_path; | |
24944 | + struct reinit_br_wh *a = arg; | |
24945 | + struct au_wbr *wbr; | |
24946 | + struct inode *dir; | |
24947 | + struct dentry *h_root; | |
24948 | + struct au_hinode *hdir; | |
24949 | + | |
24950 | + err = 0; | |
24951 | + wbr = a->br->br_wbr; | |
24952 | + /* big aufs lock */ | |
24953 | + si_noflush_write_lock(a->sb); | |
24954 | + if (!au_br_writable(a->br->br_perm)) | |
24955 | + goto out; | |
24956 | + bindex = au_br_index(a->sb, a->br->br_id); | |
24957 | + if (unlikely(bindex < 0)) | |
24958 | + goto out; | |
24959 | + | |
1308ab2a | 24960 | + di_read_lock_parent(a->sb->s_root, AuLock_IR); |
1facf9fc | 24961 | + dir = a->sb->s_root->d_inode; |
1facf9fc | 24962 | + hdir = au_hi(dir, bindex); |
24963 | + h_root = au_h_dptr(a->sb->s_root, bindex); | |
24964 | + | |
4a4d8108 | 24965 | + au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT); |
1facf9fc | 24966 | + wbr_wh_write_lock(wbr); |
24967 | + err = au_h_verify(wbr->wbr_whbase, au_opt_udba(a->sb), hdir->hi_inode, | |
24968 | + h_root, a->br); | |
24969 | + if (!err) { | |
24970 | + err = mnt_want_write(a->br->br_mnt); | |
24971 | + if (!err) { | |
24972 | + h_path.dentry = wbr->wbr_whbase; | |
24973 | + h_path.mnt = a->br->br_mnt; | |
24974 | + err = vfsub_unlink(hdir->hi_inode, &h_path, /*force*/0); | |
24975 | + mnt_drop_write(a->br->br_mnt); | |
24976 | + } | |
24977 | + } else { | |
4a4d8108 AM |
24978 | + pr_warning("%.*s is moved, ignored\n", |
24979 | + AuDLNPair(wbr->wbr_whbase)); | |
1facf9fc | 24980 | + err = 0; |
24981 | + } | |
24982 | + dput(wbr->wbr_whbase); | |
24983 | + wbr->wbr_whbase = NULL; | |
24984 | + if (!err) | |
24985 | + err = au_wh_init(h_root, a->br, a->sb); | |
24986 | + wbr_wh_write_unlock(wbr); | |
4a4d8108 | 24987 | + au_hn_imtx_unlock(hdir); |
1308ab2a | 24988 | + di_read_unlock(a->sb->s_root, AuLock_IR); |
1facf9fc | 24989 | + |
4f0767ce | 24990 | +out: |
1facf9fc | 24991 | + if (wbr) |
24992 | + atomic_dec(&wbr->wbr_wh_running); | |
24993 | + atomic_dec(&a->br->br_count); | |
24994 | + au_nwt_done(&au_sbi(a->sb)->si_nowait); | |
24995 | + si_write_unlock(a->sb); | |
24996 | + kfree(arg); | |
24997 | + if (unlikely(err)) | |
24998 | + AuIOErr("err %d\n", err); | |
24999 | +} | |
25000 | + | |
25001 | +static void kick_reinit_br_wh(struct super_block *sb, struct au_branch *br) | |
25002 | +{ | |
25003 | + int do_dec, wkq_err; | |
25004 | + struct reinit_br_wh *arg; | |
25005 | + | |
25006 | + do_dec = 1; | |
25007 | + if (atomic_inc_return(&br->br_wbr->wbr_wh_running) != 1) | |
25008 | + goto out; | |
25009 | + | |
25010 | + /* ignore ENOMEM */ | |
25011 | + arg = kmalloc(sizeof(*arg), GFP_NOFS); | |
25012 | + if (arg) { | |
25013 | + /* | |
25014 | + * dec(wh_running), kfree(arg) and dec(br_count) | |
25015 | + * in reinit function | |
25016 | + */ | |
25017 | + arg->sb = sb; | |
25018 | + arg->br = br; | |
25019 | + atomic_inc(&br->br_count); | |
25020 | + wkq_err = au_wkq_nowait(reinit_br_wh, arg, sb); | |
25021 | + if (unlikely(wkq_err)) { | |
25022 | + atomic_dec(&br->br_wbr->wbr_wh_running); | |
25023 | + atomic_dec(&br->br_count); | |
25024 | + kfree(arg); | |
25025 | + } | |
25026 | + do_dec = 0; | |
25027 | + } | |
25028 | + | |
4f0767ce | 25029 | +out: |
1facf9fc | 25030 | + if (do_dec) |
25031 | + atomic_dec(&br->br_wbr->wbr_wh_running); | |
25032 | +} | |
25033 | + | |
25034 | +/* ---------------------------------------------------------------------- */ | |
25035 | + | |
25036 | +/* | |
25037 | + * create the whiteout @wh. | |
25038 | + */ | |
25039 | +static int link_or_create_wh(struct super_block *sb, aufs_bindex_t bindex, | |
25040 | + struct dentry *wh) | |
25041 | +{ | |
25042 | + int err; | |
25043 | + struct path h_path = { | |
25044 | + .dentry = wh | |
25045 | + }; | |
25046 | + struct au_branch *br; | |
25047 | + struct au_wbr *wbr; | |
25048 | + struct dentry *h_parent; | |
25049 | + struct inode *h_dir; | |
25050 | + | |
25051 | + h_parent = wh->d_parent; /* dir inode is locked */ | |
25052 | + h_dir = h_parent->d_inode; | |
25053 | + IMustLock(h_dir); | |
25054 | + | |
25055 | + br = au_sbr(sb, bindex); | |
25056 | + h_path.mnt = br->br_mnt; | |
25057 | + wbr = br->br_wbr; | |
25058 | + wbr_wh_read_lock(wbr); | |
25059 | + if (wbr->wbr_whbase) { | |
25060 | + err = vfsub_link(wbr->wbr_whbase, h_dir, &h_path); | |
25061 | + if (!err || err != -EMLINK) | |
25062 | + goto out; | |
25063 | + | |
25064 | + /* link count full. re-initialize br_whbase. */ | |
25065 | + kick_reinit_br_wh(sb, br); | |
25066 | + } | |
25067 | + | |
25068 | + /* return this error in this context */ | |
25069 | + err = vfsub_create(h_dir, &h_path, WH_MASK); | |
25070 | + | |
4f0767ce | 25071 | +out: |
1facf9fc | 25072 | + wbr_wh_read_unlock(wbr); |
25073 | + return err; | |
25074 | +} | |
25075 | + | |
25076 | +/* ---------------------------------------------------------------------- */ | |
25077 | + | |
25078 | +/* | |
25079 | + * create or remove the diropq. | |
25080 | + */ | |
25081 | +static struct dentry *do_diropq(struct dentry *dentry, aufs_bindex_t bindex, | |
25082 | + unsigned int flags) | |
25083 | +{ | |
25084 | + struct dentry *opq_dentry, *h_dentry; | |
25085 | + struct super_block *sb; | |
25086 | + struct au_branch *br; | |
25087 | + int err; | |
25088 | + | |
25089 | + sb = dentry->d_sb; | |
25090 | + br = au_sbr(sb, bindex); | |
25091 | + h_dentry = au_h_dptr(dentry, bindex); | |
25092 | + opq_dentry = au_lkup_one(&diropq_name, h_dentry, br, /*nd*/NULL); | |
25093 | + if (IS_ERR(opq_dentry)) | |
25094 | + goto out; | |
25095 | + | |
25096 | + if (au_ftest_diropq(flags, CREATE)) { | |
25097 | + err = link_or_create_wh(sb, bindex, opq_dentry); | |
25098 | + if (!err) { | |
25099 | + au_set_dbdiropq(dentry, bindex); | |
25100 | + goto out; /* success */ | |
25101 | + } | |
25102 | + } else { | |
25103 | + struct path tmp = { | |
25104 | + .dentry = opq_dentry, | |
25105 | + .mnt = br->br_mnt | |
25106 | + }; | |
25107 | + err = do_unlink_wh(au_h_iptr(dentry->d_inode, bindex), &tmp); | |
25108 | + if (!err) | |
25109 | + au_set_dbdiropq(dentry, -1); | |
25110 | + } | |
25111 | + dput(opq_dentry); | |
25112 | + opq_dentry = ERR_PTR(err); | |
25113 | + | |
4f0767ce | 25114 | +out: |
1facf9fc | 25115 | + return opq_dentry; |
25116 | +} | |
25117 | + | |
25118 | +struct do_diropq_args { | |
25119 | + struct dentry **errp; | |
25120 | + struct dentry *dentry; | |
25121 | + aufs_bindex_t bindex; | |
25122 | + unsigned int flags; | |
25123 | +}; | |
25124 | + | |
25125 | +static void call_do_diropq(void *args) | |
25126 | +{ | |
25127 | + struct do_diropq_args *a = args; | |
25128 | + *a->errp = do_diropq(a->dentry, a->bindex, a->flags); | |
25129 | +} | |
25130 | + | |
25131 | +struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex, | |
25132 | + unsigned int flags) | |
25133 | +{ | |
25134 | + struct dentry *diropq, *h_dentry; | |
25135 | + | |
25136 | + h_dentry = au_h_dptr(dentry, bindex); | |
25137 | + if (!au_test_h_perm_sio(h_dentry->d_inode, MAY_EXEC | MAY_WRITE)) | |
25138 | + diropq = do_diropq(dentry, bindex, flags); | |
25139 | + else { | |
25140 | + int wkq_err; | |
25141 | + struct do_diropq_args args = { | |
25142 | + .errp = &diropq, | |
25143 | + .dentry = dentry, | |
25144 | + .bindex = bindex, | |
25145 | + .flags = flags | |
25146 | + }; | |
25147 | + | |
25148 | + wkq_err = au_wkq_wait(call_do_diropq, &args); | |
25149 | + if (unlikely(wkq_err)) | |
25150 | + diropq = ERR_PTR(wkq_err); | |
25151 | + } | |
25152 | + | |
25153 | + return diropq; | |
25154 | +} | |
25155 | + | |
25156 | +/* ---------------------------------------------------------------------- */ | |
25157 | + | |
25158 | +/* | |
25159 | + * lookup whiteout dentry. | |
25160 | + * @h_parent: lower parent dentry which must exist and be locked | |
25161 | + * @base_name: name of dentry which will be whiteouted | |
25162 | + * returns dentry for whiteout. | |
25163 | + */ | |
25164 | +struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name, | |
25165 | + struct au_branch *br) | |
25166 | +{ | |
25167 | + int err; | |
25168 | + struct qstr wh_name; | |
25169 | + struct dentry *wh_dentry; | |
25170 | + | |
25171 | + err = au_wh_name_alloc(&wh_name, base_name); | |
25172 | + wh_dentry = ERR_PTR(err); | |
25173 | + if (!err) { | |
25174 | + wh_dentry = au_lkup_one(&wh_name, h_parent, br, /*nd*/NULL); | |
25175 | + kfree(wh_name.name); | |
25176 | + } | |
25177 | + return wh_dentry; | |
25178 | +} | |
25179 | + | |
25180 | +/* | |
25181 | + * link/create a whiteout for @dentry on @bindex. | |
25182 | + */ | |
25183 | +struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex, | |
25184 | + struct dentry *h_parent) | |
25185 | +{ | |
25186 | + struct dentry *wh_dentry; | |
25187 | + struct super_block *sb; | |
25188 | + int err; | |
25189 | + | |
25190 | + sb = dentry->d_sb; | |
25191 | + wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, au_sbr(sb, bindex)); | |
25192 | + if (!IS_ERR(wh_dentry) && !wh_dentry->d_inode) { | |
25193 | + err = link_or_create_wh(sb, bindex, wh_dentry); | |
25194 | + if (!err) | |
25195 | + au_set_dbwh(dentry, bindex); | |
25196 | + else { | |
25197 | + dput(wh_dentry); | |
25198 | + wh_dentry = ERR_PTR(err); | |
25199 | + } | |
25200 | + } | |
25201 | + | |
25202 | + return wh_dentry; | |
25203 | +} | |
25204 | + | |
25205 | +/* ---------------------------------------------------------------------- */ | |
25206 | + | |
25207 | +/* Delete all whiteouts in this directory on branch bindex. */ | |
25208 | +static int del_wh_children(struct dentry *h_dentry, struct au_nhash *whlist, | |
25209 | + aufs_bindex_t bindex, struct au_branch *br) | |
25210 | +{ | |
25211 | + int err; | |
25212 | + unsigned long ul, n; | |
25213 | + struct qstr wh_name; | |
25214 | + char *p; | |
25215 | + struct hlist_head *head; | |
25216 | + struct au_vdir_wh *tpos; | |
25217 | + struct hlist_node *pos; | |
25218 | + struct au_vdir_destr *str; | |
25219 | + | |
25220 | + err = -ENOMEM; | |
4a4d8108 | 25221 | + p = __getname_gfp(GFP_NOFS); |
1facf9fc | 25222 | + wh_name.name = p; |
25223 | + if (unlikely(!wh_name.name)) | |
25224 | + goto out; | |
25225 | + | |
25226 | + err = 0; | |
25227 | + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); | |
25228 | + p += AUFS_WH_PFX_LEN; | |
25229 | + n = whlist->nh_num; | |
25230 | + head = whlist->nh_head; | |
25231 | + for (ul = 0; !err && ul < n; ul++, head++) { | |
25232 | + hlist_for_each_entry(tpos, pos, head, wh_hash) { | |
25233 | + if (tpos->wh_bindex != bindex) | |
25234 | + continue; | |
25235 | + | |
25236 | + str = &tpos->wh_str; | |
25237 | + if (str->len + AUFS_WH_PFX_LEN <= PATH_MAX) { | |
25238 | + memcpy(p, str->name, str->len); | |
25239 | + wh_name.len = AUFS_WH_PFX_LEN + str->len; | |
25240 | + err = unlink_wh_name(h_dentry, &wh_name, br); | |
25241 | + if (!err) | |
25242 | + continue; | |
25243 | + break; | |
25244 | + } | |
25245 | + AuIOErr("whiteout name too long %.*s\n", | |
25246 | + str->len, str->name); | |
25247 | + err = -EIO; | |
25248 | + break; | |
25249 | + } | |
25250 | + } | |
25251 | + __putname(wh_name.name); | |
25252 | + | |
4f0767ce | 25253 | +out: |
1facf9fc | 25254 | + return err; |
25255 | +} | |
25256 | + | |
25257 | +struct del_wh_children_args { | |
25258 | + int *errp; | |
25259 | + struct dentry *h_dentry; | |
1308ab2a | 25260 | + struct au_nhash *whlist; |
1facf9fc | 25261 | + aufs_bindex_t bindex; |
25262 | + struct au_branch *br; | |
25263 | +}; | |
25264 | + | |
25265 | +static void call_del_wh_children(void *args) | |
25266 | +{ | |
25267 | + struct del_wh_children_args *a = args; | |
1308ab2a | 25268 | + *a->errp = del_wh_children(a->h_dentry, a->whlist, a->bindex, a->br); |
1facf9fc | 25269 | +} |
25270 | + | |
25271 | +/* ---------------------------------------------------------------------- */ | |
25272 | + | |
25273 | +struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp) | |
25274 | +{ | |
25275 | + struct au_whtmp_rmdir *whtmp; | |
dece6358 | 25276 | + int err; |
1308ab2a | 25277 | + unsigned int rdhash; |
dece6358 AM |
25278 | + |
25279 | + SiMustAnyLock(sb); | |
1facf9fc | 25280 | + |
25281 | + whtmp = kmalloc(sizeof(*whtmp), gfp); | |
dece6358 AM |
25282 | + if (unlikely(!whtmp)) { |
25283 | + whtmp = ERR_PTR(-ENOMEM); | |
1facf9fc | 25284 | + goto out; |
dece6358 | 25285 | + } |
1facf9fc | 25286 | + |
25287 | + whtmp->dir = NULL; | |
25288 | + whtmp->wh_dentry = NULL; | |
1308ab2a | 25289 | + /* no estimation for dir size */ |
25290 | + rdhash = au_sbi(sb)->si_rdhash; | |
25291 | + if (!rdhash) | |
25292 | + rdhash = AUFS_RDHASH_DEF; | |
25293 | + err = au_nhash_alloc(&whtmp->whlist, rdhash, gfp); | |
25294 | + if (unlikely(err)) { | |
25295 | + kfree(whtmp); | |
25296 | + whtmp = ERR_PTR(err); | |
25297 | + } | |
dece6358 | 25298 | + |
4f0767ce | 25299 | +out: |
dece6358 | 25300 | + return whtmp; |
1facf9fc | 25301 | +} |
25302 | + | |
25303 | +void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp) | |
25304 | +{ | |
25305 | + dput(whtmp->wh_dentry); | |
25306 | + iput(whtmp->dir); | |
dece6358 | 25307 | + au_nhash_wh_free(&whtmp->whlist); |
1facf9fc | 25308 | + kfree(whtmp); |
25309 | +} | |
25310 | + | |
25311 | +/* | |
25312 | + * rmdir the whiteouted temporary named dir @h_dentry. | |
25313 | + * @whlist: whiteouted children. | |
25314 | + */ | |
25315 | +int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
25316 | + struct dentry *wh_dentry, struct au_nhash *whlist) | |
25317 | +{ | |
25318 | + int err; | |
25319 | + struct path h_tmp; | |
25320 | + struct inode *wh_inode, *h_dir; | |
25321 | + struct au_branch *br; | |
25322 | + | |
25323 | + h_dir = wh_dentry->d_parent->d_inode; /* dir inode is locked */ | |
25324 | + IMustLock(h_dir); | |
25325 | + | |
25326 | + br = au_sbr(dir->i_sb, bindex); | |
25327 | + wh_inode = wh_dentry->d_inode; | |
25328 | + mutex_lock_nested(&wh_inode->i_mutex, AuLsc_I_CHILD); | |
25329 | + | |
25330 | + /* | |
25331 | + * someone else might change some whiteouts while we were sleeping. | |
25332 | + * it means this whlist may have an obsoleted entry. | |
25333 | + */ | |
25334 | + if (!au_test_h_perm_sio(wh_inode, MAY_EXEC | MAY_WRITE)) | |
25335 | + err = del_wh_children(wh_dentry, whlist, bindex, br); | |
25336 | + else { | |
25337 | + int wkq_err; | |
25338 | + struct del_wh_children_args args = { | |
25339 | + .errp = &err, | |
25340 | + .h_dentry = wh_dentry, | |
1308ab2a | 25341 | + .whlist = whlist, |
1facf9fc | 25342 | + .bindex = bindex, |
25343 | + .br = br | |
25344 | + }; | |
25345 | + | |
25346 | + wkq_err = au_wkq_wait(call_del_wh_children, &args); | |
25347 | + if (unlikely(wkq_err)) | |
25348 | + err = wkq_err; | |
25349 | + } | |
25350 | + mutex_unlock(&wh_inode->i_mutex); | |
25351 | + | |
25352 | + if (!err) { | |
25353 | + h_tmp.dentry = wh_dentry; | |
25354 | + h_tmp.mnt = br->br_mnt; | |
25355 | + err = vfsub_rmdir(h_dir, &h_tmp); | |
25356 | + /* d_drop(h_dentry); */ | |
25357 | + } | |
25358 | + | |
25359 | + if (!err) { | |
25360 | + if (au_ibstart(dir) == bindex) { | |
25361 | + au_cpup_attr_timesizes(dir); | |
25362 | + drop_nlink(dir); | |
25363 | + } | |
25364 | + return 0; /* success */ | |
25365 | + } | |
25366 | + | |
4a4d8108 AM |
25367 | + pr_warning("failed removing %.*s(%d), ignored\n", |
25368 | + AuDLNPair(wh_dentry), err); | |
1facf9fc | 25369 | + return err; |
25370 | +} | |
25371 | + | |
25372 | +static void call_rmdir_whtmp(void *args) | |
25373 | +{ | |
25374 | + int err; | |
25375 | + struct au_whtmp_rmdir *a = args; | |
25376 | + struct super_block *sb; | |
25377 | + struct dentry *h_parent; | |
25378 | + struct inode *h_dir; | |
953406b4 | 25379 | + struct au_branch *br; |
1facf9fc | 25380 | + struct au_hinode *hdir; |
25381 | + | |
25382 | + /* rmdir by nfsd may cause deadlock with this i_mutex */ | |
25383 | + /* mutex_lock(&a->dir->i_mutex); */ | |
25384 | + sb = a->dir->i_sb; | |
953406b4 AM |
25385 | + si_noflush_read_lock(sb); |
25386 | + err = au_test_ro(sb, a->bindex, NULL); | |
25387 | + if (unlikely(err)) | |
1facf9fc | 25388 | + goto out; |
25389 | + | |
25390 | + err = -EIO; | |
953406b4 | 25391 | + br = au_sbr(sb, a->bindex); |
1facf9fc | 25392 | + ii_write_lock_parent(a->dir); |
25393 | + h_parent = dget_parent(a->wh_dentry); | |
25394 | + h_dir = h_parent->d_inode; | |
953406b4 | 25395 | + hdir = au_hi(a->dir, a->bindex); |
4a4d8108 | 25396 | + au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT); |
953406b4 | 25397 | + err = au_h_verify(a->wh_dentry, au_opt_udba(sb), h_dir, h_parent, br); |
1facf9fc | 25398 | + if (!err) { |
953406b4 | 25399 | + err = mnt_want_write(br->br_mnt); |
1facf9fc | 25400 | + if (!err) { |
953406b4 | 25401 | + err = au_whtmp_rmdir(a->dir, a->bindex, a->wh_dentry, |
dece6358 | 25402 | + &a->whlist); |
953406b4 | 25403 | + mnt_drop_write(br->br_mnt); |
1facf9fc | 25404 | + } |
25405 | + } | |
4a4d8108 | 25406 | + au_hn_imtx_unlock(hdir); |
1facf9fc | 25407 | + dput(h_parent); |
25408 | + ii_write_unlock(a->dir); | |
25409 | + | |
4f0767ce | 25410 | +out: |
1facf9fc | 25411 | + /* mutex_unlock(&a->dir->i_mutex); */ |
25412 | + au_nwt_done(&au_sbi(sb)->si_nowait); | |
25413 | + si_read_unlock(sb); | |
25414 | + au_whtmp_rmdir_free(a); | |
25415 | + if (unlikely(err)) | |
25416 | + AuIOErr("err %d\n", err); | |
25417 | +} | |
25418 | + | |
25419 | +void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
25420 | + struct dentry *wh_dentry, struct au_whtmp_rmdir *args) | |
25421 | +{ | |
25422 | + int wkq_err; | |
25423 | + | |
25424 | + IMustLock(dir); | |
25425 | + | |
25426 | + /* all post-process will be done in do_rmdir_whtmp(). */ | |
25427 | + args->dir = au_igrab(dir); | |
953406b4 | 25428 | + args->bindex = bindex; |
1facf9fc | 25429 | + args->wh_dentry = dget(wh_dentry); |
953406b4 | 25430 | + wkq_err = au_wkq_nowait(call_rmdir_whtmp, args, dir->i_sb); |
1facf9fc | 25431 | + if (unlikely(wkq_err)) { |
4a4d8108 AM |
25432 | + pr_warning("rmdir error %.*s (%d), ignored\n", |
25433 | + AuDLNPair(wh_dentry), wkq_err); | |
1facf9fc | 25434 | + au_whtmp_rmdir_free(args); |
25435 | + } | |
25436 | +} | |
b752ccd1 AM |
25437 | diff -urN /usr/share/empty/fs/aufs/whout.h linux/fs/aufs/whout.h |
25438 | --- /usr/share/empty/fs/aufs/whout.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 25439 | +++ linux/fs/aufs/whout.h 2010-10-21 09:52:43.096959416 +0200 |
dece6358 | 25440 | @@ -0,0 +1,87 @@ |
1facf9fc | 25441 | +/* |
4a4d8108 | 25442 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 25443 | + * |
25444 | + * This program, aufs is free software; you can redistribute it and/or modify | |
25445 | + * it under the terms of the GNU General Public License as published by | |
25446 | + * the Free Software Foundation; either version 2 of the License, or | |
25447 | + * (at your option) any later version. | |
dece6358 AM |
25448 | + * |
25449 | + * This program is distributed in the hope that it will be useful, | |
25450 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25451 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25452 | + * GNU General Public License for more details. | |
25453 | + * | |
25454 | + * You should have received a copy of the GNU General Public License | |
25455 | + * along with this program; if not, write to the Free Software | |
25456 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 25457 | + */ |
25458 | + | |
25459 | +/* | |
25460 | + * whiteout for logical deletion and opaque directory | |
25461 | + */ | |
25462 | + | |
25463 | +#ifndef __AUFS_WHOUT_H__ | |
25464 | +#define __AUFS_WHOUT_H__ | |
25465 | + | |
25466 | +#ifdef __KERNEL__ | |
25467 | + | |
1facf9fc | 25468 | +#include <linux/aufs_type.h> |
25469 | +#include "dir.h" | |
25470 | + | |
25471 | +/* whout.c */ | |
25472 | +int au_wh_name_alloc(struct qstr *wh, const struct qstr *name); | |
25473 | +struct au_branch; | |
25474 | +int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, | |
25475 | + struct au_branch *br, int try_sio); | |
25476 | +int au_diropq_test(struct dentry *h_dentry, struct au_branch *br); | |
25477 | +struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br, | |
25478 | + struct qstr *prefix); | |
25479 | +int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br); | |
25480 | +int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path, | |
25481 | + struct dentry *dentry); | |
25482 | +int au_wh_init(struct dentry *h_parent, struct au_branch *br, | |
25483 | + struct super_block *sb); | |
25484 | + | |
25485 | +/* diropq flags */ | |
25486 | +#define AuDiropq_CREATE 1 | |
25487 | +#define au_ftest_diropq(flags, name) ((flags) & AuDiropq_##name) | |
25488 | +#define au_fset_diropq(flags, name) { (flags) |= AuDiropq_##name; } | |
25489 | +#define au_fclr_diropq(flags, name) { (flags) &= ~AuDiropq_##name; } | |
25490 | + | |
25491 | +struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex, | |
25492 | + unsigned int flags); | |
25493 | +struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name, | |
25494 | + struct au_branch *br); | |
25495 | +struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex, | |
25496 | + struct dentry *h_parent); | |
25497 | + | |
25498 | +/* real rmdir for the whiteout-ed dir */ | |
25499 | +struct au_whtmp_rmdir { | |
25500 | + struct inode *dir; | |
953406b4 | 25501 | + aufs_bindex_t bindex; |
1facf9fc | 25502 | + struct dentry *wh_dentry; |
dece6358 | 25503 | + struct au_nhash whlist; |
1facf9fc | 25504 | +}; |
25505 | + | |
25506 | +struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp); | |
25507 | +void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp); | |
25508 | +int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
25509 | + struct dentry *wh_dentry, struct au_nhash *whlist); | |
25510 | +void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
25511 | + struct dentry *wh_dentry, struct au_whtmp_rmdir *args); | |
25512 | + | |
25513 | +/* ---------------------------------------------------------------------- */ | |
25514 | + | |
25515 | +static inline struct dentry *au_diropq_create(struct dentry *dentry, | |
25516 | + aufs_bindex_t bindex) | |
25517 | +{ | |
25518 | + return au_diropq_sio(dentry, bindex, AuDiropq_CREATE); | |
25519 | +} | |
25520 | + | |
25521 | +static inline int au_diropq_remove(struct dentry *dentry, aufs_bindex_t bindex) | |
25522 | +{ | |
25523 | + return PTR_ERR(au_diropq_sio(dentry, bindex, !AuDiropq_CREATE)); | |
25524 | +} | |
25525 | + | |
25526 | +#endif /* __KERNEL__ */ | |
25527 | +#endif /* __AUFS_WHOUT_H__ */ | |
b752ccd1 AM |
25528 | diff -urN /usr/share/empty/fs/aufs/wkq.c linux/fs/aufs/wkq.c |
25529 | --- /usr/share/empty/fs/aufs/wkq.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
25530 | +++ linux/fs/aufs/wkq.c 2010-10-21 09:52:43.096959416 +0200 |
25531 | @@ -0,0 +1,226 @@ | |
1facf9fc | 25532 | +/* |
4a4d8108 | 25533 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 25534 | + * |
25535 | + * This program, aufs is free software; you can redistribute it and/or modify | |
25536 | + * it under the terms of the GNU General Public License as published by | |
25537 | + * the Free Software Foundation; either version 2 of the License, or | |
25538 | + * (at your option) any later version. | |
dece6358 AM |
25539 | + * |
25540 | + * This program is distributed in the hope that it will be useful, | |
25541 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25542 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25543 | + * GNU General Public License for more details. | |
25544 | + * | |
25545 | + * You should have received a copy of the GNU General Public License | |
25546 | + * along with this program; if not, write to the Free Software | |
25547 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 25548 | + */ |
25549 | + | |
25550 | +/* | |
25551 | + * workqueue for asynchronous/super-io operations | |
25552 | + * todo: try new dredential scheme | |
25553 | + */ | |
25554 | + | |
dece6358 | 25555 | +#include <linux/module.h> |
1facf9fc | 25556 | +#include "aufs.h" |
25557 | + | |
b752ccd1 AM |
25558 | +/* internal workqueue named AUFS_WKQ_NAME and AUFS_WKQ_PRE_NAME */ |
25559 | +enum { | |
25560 | + AuWkq_INORMAL, | |
25561 | + AuWkq_IPRE | |
25562 | +}; | |
25563 | + | |
25564 | +static struct { | |
25565 | + char *name; | |
25566 | + struct workqueue_struct *wkq; | |
25567 | +} au_wkq[] = { | |
25568 | + [AuWkq_INORMAL] = { | |
25569 | + .name = AUFS_WKQ_NAME | |
25570 | + }, | |
25571 | + [AuWkq_IPRE] = { | |
25572 | + .name = AUFS_WKQ_PRE_NAME | |
25573 | + } | |
25574 | +}; | |
1facf9fc | 25575 | + |
25576 | +struct au_wkinfo { | |
25577 | + struct work_struct wk; | |
25578 | + struct super_block *sb; | |
25579 | + | |
25580 | + unsigned int flags; /* see wkq.h */ | |
25581 | + | |
25582 | + au_wkq_func_t func; | |
25583 | + void *args; | |
25584 | + | |
1facf9fc | 25585 | + struct completion *comp; |
25586 | +}; | |
25587 | + | |
25588 | +/* ---------------------------------------------------------------------- */ | |
25589 | + | |
1facf9fc | 25590 | +static void wkq_func(struct work_struct *wk) |
25591 | +{ | |
25592 | + struct au_wkinfo *wkinfo = container_of(wk, struct au_wkinfo, wk); | |
25593 | + | |
953406b4 AM |
25594 | + AuDebugOn(current_fsuid()); |
25595 | + AuDebugOn(rlimit(RLIMIT_FSIZE) != RLIM_INFINITY); | |
25596 | + | |
1facf9fc | 25597 | + wkinfo->func(wkinfo->args); |
1facf9fc | 25598 | + if (au_ftest_wkq(wkinfo->flags, WAIT)) |
25599 | + complete(wkinfo->comp); | |
25600 | + else { | |
25601 | + kobject_put(&au_sbi(wkinfo->sb)->si_kobj); | |
25602 | + module_put(THIS_MODULE); | |
25603 | + kfree(wkinfo); | |
25604 | + } | |
25605 | +} | |
25606 | + | |
25607 | +/* | |
25608 | + * Since struct completion is large, try allocating it dynamically. | |
25609 | + */ | |
25610 | +#if defined(CONFIG_4KSTACKS) || defined(AuTest4KSTACKS) | |
25611 | +#define AuWkqCompDeclare(name) struct completion *comp = NULL | |
25612 | + | |
25613 | +static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp) | |
25614 | +{ | |
25615 | + *comp = kmalloc(sizeof(**comp), GFP_NOFS); | |
25616 | + if (*comp) { | |
25617 | + init_completion(*comp); | |
25618 | + wkinfo->comp = *comp; | |
25619 | + return 0; | |
25620 | + } | |
25621 | + return -ENOMEM; | |
25622 | +} | |
25623 | + | |
25624 | +static void au_wkq_comp_free(struct completion *comp) | |
25625 | +{ | |
25626 | + kfree(comp); | |
25627 | +} | |
25628 | + | |
25629 | +#else | |
25630 | + | |
25631 | +/* no braces */ | |
25632 | +#define AuWkqCompDeclare(name) \ | |
25633 | + DECLARE_COMPLETION_ONSTACK(_ ## name); \ | |
25634 | + struct completion *comp = &_ ## name | |
25635 | + | |
25636 | +static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp) | |
25637 | +{ | |
25638 | + wkinfo->comp = *comp; | |
25639 | + return 0; | |
25640 | +} | |
25641 | + | |
25642 | +static void au_wkq_comp_free(struct completion *comp __maybe_unused) | |
25643 | +{ | |
25644 | + /* empty */ | |
25645 | +} | |
25646 | +#endif /* 4KSTACKS */ | |
25647 | + | |
b752ccd1 | 25648 | +static void au_wkq_run(struct au_wkinfo *wkinfo, unsigned int flags) |
1facf9fc | 25649 | +{ |
b752ccd1 AM |
25650 | + struct workqueue_struct *wkq; |
25651 | + | |
1facf9fc | 25652 | + au_dbg_verify_kthread(); |
b752ccd1 | 25653 | + if (flags & AuWkq_WAIT) { |
4a4d8108 | 25654 | + INIT_WORK_ON_STACK(&wkinfo->wk, wkq_func); |
b752ccd1 AM |
25655 | + wkq = au_wkq[AuWkq_INORMAL].wkq; |
25656 | + if (flags & AuWkq_PRE) | |
25657 | + wkq = au_wkq[AuWkq_IPRE].wkq; | |
25658 | + queue_work(wkq, &wkinfo->wk); | |
4a4d8108 AM |
25659 | + } else { |
25660 | + INIT_WORK(&wkinfo->wk, wkq_func); | |
25661 | + schedule_work(&wkinfo->wk); | |
25662 | + } | |
1facf9fc | 25663 | +} |
25664 | + | |
b752ccd1 | 25665 | +int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args) |
1facf9fc | 25666 | +{ |
25667 | + int err; | |
25668 | + AuWkqCompDeclare(comp); | |
25669 | + struct au_wkinfo wkinfo = { | |
b752ccd1 | 25670 | + .flags = flags, |
1facf9fc | 25671 | + .func = func, |
25672 | + .args = args | |
25673 | + }; | |
25674 | + | |
25675 | + err = au_wkq_comp_alloc(&wkinfo, &comp); | |
25676 | + if (!err) { | |
b752ccd1 | 25677 | + au_wkq_run(&wkinfo, flags); |
1facf9fc | 25678 | + /* no timeout, no interrupt */ |
25679 | + wait_for_completion(wkinfo.comp); | |
25680 | + au_wkq_comp_free(comp); | |
4a4d8108 | 25681 | + destroy_work_on_stack(&wkinfo.wk); |
1facf9fc | 25682 | + } |
25683 | + | |
25684 | + return err; | |
25685 | + | |
25686 | +} | |
25687 | + | |
25688 | +int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb) | |
25689 | +{ | |
25690 | + int err; | |
25691 | + struct au_wkinfo *wkinfo; | |
25692 | + | |
25693 | + atomic_inc(&au_sbi(sb)->si_nowait.nw_len); | |
25694 | + | |
25695 | + /* | |
25696 | + * wkq_func() must free this wkinfo. | |
25697 | + * it highly depends upon the implementation of workqueue. | |
25698 | + */ | |
25699 | + err = 0; | |
25700 | + wkinfo = kmalloc(sizeof(*wkinfo), GFP_NOFS); | |
25701 | + if (wkinfo) { | |
25702 | + wkinfo->sb = sb; | |
25703 | + wkinfo->flags = !AuWkq_WAIT; | |
25704 | + wkinfo->func = func; | |
25705 | + wkinfo->args = args; | |
25706 | + wkinfo->comp = NULL; | |
25707 | + kobject_get(&au_sbi(sb)->si_kobj); | |
25708 | + __module_get(THIS_MODULE); | |
25709 | + | |
4a4d8108 | 25710 | + au_wkq_run(wkinfo, !AuWkq_WAIT); |
1facf9fc | 25711 | + } else { |
25712 | + err = -ENOMEM; | |
953406b4 | 25713 | + atomic_dec(&au_sbi(sb)->si_nowait.nw_len); |
1facf9fc | 25714 | + } |
25715 | + | |
25716 | + return err; | |
25717 | +} | |
25718 | + | |
25719 | +/* ---------------------------------------------------------------------- */ | |
25720 | + | |
25721 | +void au_nwt_init(struct au_nowait_tasks *nwt) | |
25722 | +{ | |
25723 | + atomic_set(&nwt->nw_len, 0); | |
4a4d8108 | 25724 | + /* smp_mb(); */ /* atomic_set */ |
1facf9fc | 25725 | + init_waitqueue_head(&nwt->nw_wq); |
25726 | +} | |
25727 | + | |
25728 | +void au_wkq_fin(void) | |
25729 | +{ | |
b752ccd1 AM |
25730 | + int i; |
25731 | + | |
25732 | + for (i = 0; i < ARRAY_SIZE(au_wkq); i++) | |
25733 | + if (au_wkq[i].wkq) | |
25734 | + destroy_workqueue(au_wkq[i].wkq); | |
1facf9fc | 25735 | +} |
25736 | + | |
25737 | +int __init au_wkq_init(void) | |
25738 | +{ | |
b752ccd1 AM |
25739 | + int err, i; |
25740 | + | |
25741 | + err = 0; | |
25742 | + for (i = 0; !err && i < ARRAY_SIZE(au_wkq); i++) { | |
953406b4 AM |
25743 | + BUILD_BUG_ON(!WQ_RESCUER); |
25744 | + au_wkq[i].wkq = alloc_workqueue(au_wkq[i].name, !WQ_RESCUER, | |
25745 | + WQ_DFL_ACTIVE); | |
b752ccd1 AM |
25746 | + if (IS_ERR(au_wkq[i].wkq)) |
25747 | + err = PTR_ERR(au_wkq[i].wkq); | |
25748 | + else if (!au_wkq[i].wkq) | |
25749 | + err = -ENOMEM; | |
25750 | + if (unlikely(err)) | |
25751 | + au_wkq[i].wkq = NULL; | |
25752 | + } | |
953406b4 | 25753 | + if (unlikely(err)) |
b752ccd1 AM |
25754 | + au_wkq_fin(); |
25755 | + | |
25756 | + return err; | |
1facf9fc | 25757 | +} |
b752ccd1 AM |
25758 | diff -urN /usr/share/empty/fs/aufs/wkq.h linux/fs/aufs/wkq.h |
25759 | --- /usr/share/empty/fs/aufs/wkq.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 25760 | +++ linux/fs/aufs/wkq.h 2010-10-21 09:52:43.096959416 +0200 |
b752ccd1 | 25761 | @@ -0,0 +1,88 @@ |
1facf9fc | 25762 | +/* |
4a4d8108 | 25763 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 25764 | + * |
25765 | + * This program, aufs is free software; you can redistribute it and/or modify | |
25766 | + * it under the terms of the GNU General Public License as published by | |
25767 | + * the Free Software Foundation; either version 2 of the License, or | |
25768 | + * (at your option) any later version. | |
dece6358 AM |
25769 | + * |
25770 | + * This program is distributed in the hope that it will be useful, | |
25771 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25772 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25773 | + * GNU General Public License for more details. | |
25774 | + * | |
25775 | + * You should have received a copy of the GNU General Public License | |
25776 | + * along with this program; if not, write to the Free Software | |
25777 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 25778 | + */ |
25779 | + | |
25780 | +/* | |
25781 | + * workqueue for asynchronous/super-io operations | |
25782 | + * todo: try new credentials management scheme | |
25783 | + */ | |
25784 | + | |
25785 | +#ifndef __AUFS_WKQ_H__ | |
25786 | +#define __AUFS_WKQ_H__ | |
25787 | + | |
25788 | +#ifdef __KERNEL__ | |
25789 | + | |
1facf9fc | 25790 | +#include <linux/sched.h> |
dece6358 | 25791 | +#include <linux/wait.h> |
1facf9fc | 25792 | +#include <linux/aufs_type.h> |
25793 | + | |
dece6358 AM |
25794 | +struct super_block; |
25795 | + | |
1facf9fc | 25796 | +/* ---------------------------------------------------------------------- */ |
25797 | + | |
25798 | +/* | |
25799 | + * in the next operation, wait for the 'nowait' tasks in system-wide workqueue | |
25800 | + */ | |
25801 | +struct au_nowait_tasks { | |
25802 | + atomic_t nw_len; | |
25803 | + wait_queue_head_t nw_wq; | |
25804 | +}; | |
25805 | + | |
25806 | +/* ---------------------------------------------------------------------- */ | |
25807 | + | |
25808 | +typedef void (*au_wkq_func_t)(void *args); | |
25809 | + | |
25810 | +/* wkq flags */ | |
25811 | +#define AuWkq_WAIT 1 | |
b752ccd1 | 25812 | +#define AuWkq_PRE (1 << 1) |
1facf9fc | 25813 | +#define au_ftest_wkq(flags, name) ((flags) & AuWkq_##name) |
25814 | +#define au_fset_wkq(flags, name) { (flags) |= AuWkq_##name; } | |
25815 | +#define au_fclr_wkq(flags, name) { (flags) &= ~AuWkq_##name; } | |
25816 | + | |
25817 | +/* wkq.c */ | |
b752ccd1 | 25818 | +int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args); |
1facf9fc | 25819 | +int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb); |
25820 | +void au_nwt_init(struct au_nowait_tasks *nwt); | |
25821 | +int __init au_wkq_init(void); | |
25822 | +void au_wkq_fin(void); | |
25823 | + | |
25824 | +/* ---------------------------------------------------------------------- */ | |
25825 | + | |
b752ccd1 AM |
25826 | +static inline int au_wkq_wait_pre(au_wkq_func_t func, void *args) |
25827 | +{ | |
25828 | + return au_wkq_do_wait(AuWkq_WAIT | AuWkq_PRE, func, args); | |
25829 | +} | |
25830 | + | |
25831 | +static inline int au_wkq_wait(au_wkq_func_t func, void *args) | |
1facf9fc | 25832 | +{ |
b752ccd1 | 25833 | + return au_wkq_do_wait(AuWkq_WAIT, func, args); |
1facf9fc | 25834 | +} |
25835 | + | |
25836 | +static inline void au_nwt_done(struct au_nowait_tasks *nwt) | |
25837 | +{ | |
953406b4 | 25838 | + if (!atomic_dec_return(&nwt->nw_len)) |
1facf9fc | 25839 | + wake_up_all(&nwt->nw_wq); |
25840 | +} | |
25841 | + | |
25842 | +static inline int au_nwt_flush(struct au_nowait_tasks *nwt) | |
25843 | +{ | |
25844 | + wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len)); | |
25845 | + return 0; | |
25846 | +} | |
25847 | + | |
25848 | +#endif /* __KERNEL__ */ | |
25849 | +#endif /* __AUFS_WKQ_H__ */ | |
b752ccd1 AM |
25850 | diff -urN /usr/share/empty/fs/aufs/xino.c linux/fs/aufs/xino.c |
25851 | --- /usr/share/empty/fs/aufs/xino.c 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 | 25852 | +++ linux/fs/aufs/xino.c 2010-10-21 09:52:43.096959416 +0200 |
b752ccd1 | 25853 | @@ -0,0 +1,1263 @@ |
1facf9fc | 25854 | +/* |
4a4d8108 | 25855 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 25856 | + * |
25857 | + * This program, aufs is free software; you can redistribute it and/or modify | |
25858 | + * it under the terms of the GNU General Public License as published by | |
25859 | + * the Free Software Foundation; either version 2 of the License, or | |
25860 | + * (at your option) any later version. | |
dece6358 AM |
25861 | + * |
25862 | + * This program is distributed in the hope that it will be useful, | |
25863 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25864 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25865 | + * GNU General Public License for more details. | |
25866 | + * | |
25867 | + * You should have received a copy of the GNU General Public License | |
25868 | + * along with this program; if not, write to the Free Software | |
25869 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 25870 | + */ |
25871 | + | |
25872 | +/* | |
25873 | + * external inode number translation table and bitmap | |
25874 | + */ | |
25875 | + | |
dece6358 | 25876 | +#include <linux/file.h> |
1facf9fc | 25877 | +#include <linux/seq_file.h> |
25878 | +#include <linux/uaccess.h> | |
25879 | +#include "aufs.h" | |
25880 | + | |
b752ccd1 | 25881 | +ssize_t xino_fread(au_readf_t func, struct file *file, void *kbuf, size_t size, |
1facf9fc | 25882 | + loff_t *pos) |
25883 | +{ | |
25884 | + ssize_t err; | |
25885 | + mm_segment_t oldfs; | |
b752ccd1 AM |
25886 | + union { |
25887 | + void *k; | |
25888 | + char __user *u; | |
25889 | + } buf; | |
1facf9fc | 25890 | + |
b752ccd1 | 25891 | + buf.k = kbuf; |
1facf9fc | 25892 | + oldfs = get_fs(); |
25893 | + set_fs(KERNEL_DS); | |
25894 | + do { | |
25895 | + /* todo: signal_pending? */ | |
b752ccd1 | 25896 | + err = func(file, buf.u, size, pos); |
1facf9fc | 25897 | + } while (err == -EAGAIN || err == -EINTR); |
25898 | + set_fs(oldfs); | |
25899 | + | |
25900 | +#if 0 /* reserved for future use */ | |
25901 | + if (err > 0) | |
25902 | + fsnotify_access(file->f_dentry); | |
25903 | +#endif | |
25904 | + | |
25905 | + return err; | |
25906 | +} | |
25907 | + | |
25908 | +/* ---------------------------------------------------------------------- */ | |
25909 | + | |
b752ccd1 | 25910 | +static ssize_t do_xino_fwrite(au_writef_t func, struct file *file, void *kbuf, |
1facf9fc | 25911 | + size_t size, loff_t *pos) |
25912 | +{ | |
25913 | + ssize_t err; | |
25914 | + mm_segment_t oldfs; | |
b752ccd1 AM |
25915 | + union { |
25916 | + void *k; | |
25917 | + const char __user *u; | |
25918 | + } buf; | |
1facf9fc | 25919 | + |
b752ccd1 | 25920 | + buf.k = kbuf; |
1facf9fc | 25921 | + oldfs = get_fs(); |
25922 | + set_fs(KERNEL_DS); | |
1facf9fc | 25923 | + do { |
25924 | + /* todo: signal_pending? */ | |
b752ccd1 | 25925 | + err = func(file, buf.u, size, pos); |
1facf9fc | 25926 | + } while (err == -EAGAIN || err == -EINTR); |
1facf9fc | 25927 | + set_fs(oldfs); |
25928 | + | |
25929 | +#if 0 /* reserved for future use */ | |
25930 | + if (err > 0) | |
25931 | + fsnotify_modify(file->f_dentry); | |
25932 | +#endif | |
25933 | + | |
25934 | + return err; | |
25935 | +} | |
25936 | + | |
25937 | +struct do_xino_fwrite_args { | |
25938 | + ssize_t *errp; | |
25939 | + au_writef_t func; | |
25940 | + struct file *file; | |
25941 | + void *buf; | |
25942 | + size_t size; | |
25943 | + loff_t *pos; | |
25944 | +}; | |
25945 | + | |
25946 | +static void call_do_xino_fwrite(void *args) | |
25947 | +{ | |
25948 | + struct do_xino_fwrite_args *a = args; | |
25949 | + *a->errp = do_xino_fwrite(a->func, a->file, a->buf, a->size, a->pos); | |
25950 | +} | |
25951 | + | |
25952 | +ssize_t xino_fwrite(au_writef_t func, struct file *file, void *buf, size_t size, | |
25953 | + loff_t *pos) | |
25954 | +{ | |
25955 | + ssize_t err; | |
25956 | + | |
25957 | + /* todo: signal block and no wkq? */ | |
b752ccd1 AM |
25958 | + if (rlimit(RLIMIT_FSIZE) == RLIM_INFINITY) { |
25959 | + lockdep_off(); | |
25960 | + err = do_xino_fwrite(func, file, buf, size, pos); | |
25961 | + lockdep_on(); | |
25962 | + } else { | |
25963 | + /* | |
25964 | + * it breaks RLIMIT_FSIZE and normal user's limit, | |
25965 | + * users should care about quota and real 'filesystem full.' | |
25966 | + */ | |
1facf9fc | 25967 | + int wkq_err; |
25968 | + struct do_xino_fwrite_args args = { | |
25969 | + .errp = &err, | |
25970 | + .func = func, | |
25971 | + .file = file, | |
25972 | + .buf = buf, | |
25973 | + .size = size, | |
25974 | + .pos = pos | |
25975 | + }; | |
25976 | + | |
25977 | + wkq_err = au_wkq_wait(call_do_xino_fwrite, &args); | |
25978 | + if (unlikely(wkq_err)) | |
25979 | + err = wkq_err; | |
b752ccd1 | 25980 | + } |
1facf9fc | 25981 | + |
25982 | + return err; | |
25983 | +} | |
25984 | + | |
25985 | +/* ---------------------------------------------------------------------- */ | |
25986 | + | |
25987 | +/* | |
25988 | + * create a new xinofile at the same place/path as @base_file. | |
25989 | + */ | |
25990 | +struct file *au_xino_create2(struct file *base_file, struct file *copy_src) | |
25991 | +{ | |
25992 | + struct file *file; | |
4a4d8108 | 25993 | + struct dentry *base, *parent; |
1facf9fc | 25994 | + struct inode *dir; |
25995 | + struct qstr *name; | |
1308ab2a | 25996 | + struct path path; |
4a4d8108 | 25997 | + int err; |
1facf9fc | 25998 | + |
25999 | + base = base_file->f_dentry; | |
26000 | + parent = base->d_parent; /* dir inode is locked */ | |
26001 | + dir = parent->d_inode; | |
26002 | + IMustLock(dir); | |
26003 | + | |
26004 | + file = ERR_PTR(-EINVAL); | |
26005 | + name = &base->d_name; | |
4a4d8108 AM |
26006 | + path.dentry = vfsub_lookup_one_len(name->name, parent, name->len); |
26007 | + if (IS_ERR(path.dentry)) { | |
26008 | + file = (void *)path.dentry; | |
26009 | + pr_err("%.*s lookup err %ld\n", | |
26010 | + AuLNPair(name), PTR_ERR(path.dentry)); | |
1facf9fc | 26011 | + goto out; |
26012 | + } | |
26013 | + | |
26014 | + /* no need to mnt_want_write() since we call dentry_open() later */ | |
4a4d8108 | 26015 | + err = vfs_create(dir, path.dentry, S_IRUGO | S_IWUGO, NULL); |
1facf9fc | 26016 | + if (unlikely(err)) { |
26017 | + file = ERR_PTR(err); | |
4a4d8108 | 26018 | + pr_err("%.*s create err %d\n", AuLNPair(name), err); |
1facf9fc | 26019 | + goto out_dput; |
26020 | + } | |
26021 | + | |
1308ab2a | 26022 | + path.mnt = base_file->f_vfsmnt; |
4a4d8108 AM |
26023 | + file = vfsub_dentry_open(&path, |
26024 | + O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE); | |
1facf9fc | 26025 | + if (IS_ERR(file)) { |
4a4d8108 | 26026 | + pr_err("%.*s open err %ld\n", AuLNPair(name), PTR_ERR(file)); |
1facf9fc | 26027 | + goto out_dput; |
26028 | + } | |
26029 | + | |
26030 | + err = vfsub_unlink(dir, &file->f_path, /*force*/0); | |
26031 | + if (unlikely(err)) { | |
4a4d8108 | 26032 | + pr_err("%.*s unlink err %d\n", AuLNPair(name), err); |
1facf9fc | 26033 | + goto out_fput; |
26034 | + } | |
26035 | + | |
26036 | + if (copy_src) { | |
26037 | + /* no one can touch copy_src xino */ | |
26038 | + err = au_copy_file(file, copy_src, | |
26039 | + i_size_read(copy_src->f_dentry->d_inode)); | |
26040 | + if (unlikely(err)) { | |
4a4d8108 | 26041 | + pr_err("%.*s copy err %d\n", AuLNPair(name), err); |
1facf9fc | 26042 | + goto out_fput; |
26043 | + } | |
26044 | + } | |
26045 | + goto out_dput; /* success */ | |
26046 | + | |
4f0767ce | 26047 | +out_fput: |
1facf9fc | 26048 | + fput(file); |
26049 | + file = ERR_PTR(err); | |
4f0767ce | 26050 | +out_dput: |
4a4d8108 | 26051 | + dput(path.dentry); |
4f0767ce | 26052 | +out: |
1facf9fc | 26053 | + return file; |
26054 | +} | |
26055 | + | |
26056 | +struct au_xino_lock_dir { | |
26057 | + struct au_hinode *hdir; | |
26058 | + struct dentry *parent; | |
26059 | + struct mutex *mtx; | |
26060 | +}; | |
26061 | + | |
26062 | +static void au_xino_lock_dir(struct super_block *sb, struct file *xino, | |
26063 | + struct au_xino_lock_dir *ldir) | |
26064 | +{ | |
26065 | + aufs_bindex_t brid, bindex; | |
26066 | + | |
26067 | + ldir->hdir = NULL; | |
26068 | + bindex = -1; | |
26069 | + brid = au_xino_brid(sb); | |
26070 | + if (brid >= 0) | |
26071 | + bindex = au_br_index(sb, brid); | |
26072 | + if (bindex >= 0) { | |
26073 | + ldir->hdir = au_hi(sb->s_root->d_inode, bindex); | |
4a4d8108 | 26074 | + au_hn_imtx_lock_nested(ldir->hdir, AuLsc_I_PARENT); |
1facf9fc | 26075 | + } else { |
26076 | + ldir->parent = dget_parent(xino->f_dentry); | |
26077 | + ldir->mtx = &ldir->parent->d_inode->i_mutex; | |
26078 | + mutex_lock_nested(ldir->mtx, AuLsc_I_PARENT); | |
26079 | + } | |
26080 | +} | |
26081 | + | |
26082 | +static void au_xino_unlock_dir(struct au_xino_lock_dir *ldir) | |
26083 | +{ | |
26084 | + if (ldir->hdir) | |
4a4d8108 | 26085 | + au_hn_imtx_unlock(ldir->hdir); |
1facf9fc | 26086 | + else { |
26087 | + mutex_unlock(ldir->mtx); | |
26088 | + dput(ldir->parent); | |
26089 | + } | |
26090 | +} | |
26091 | + | |
26092 | +/* ---------------------------------------------------------------------- */ | |
26093 | + | |
26094 | +/* trucate xino files asynchronously */ | |
26095 | + | |
26096 | +int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex) | |
26097 | +{ | |
26098 | + int err; | |
26099 | + aufs_bindex_t bi, bend; | |
26100 | + struct au_branch *br; | |
26101 | + struct file *new_xino, *file; | |
26102 | + struct super_block *h_sb; | |
26103 | + struct au_xino_lock_dir ldir; | |
26104 | + | |
26105 | + err = -EINVAL; | |
26106 | + bend = au_sbend(sb); | |
26107 | + if (unlikely(bindex < 0 || bend < bindex)) | |
26108 | + goto out; | |
26109 | + br = au_sbr(sb, bindex); | |
26110 | + file = br->br_xino.xi_file; | |
26111 | + if (!file) | |
26112 | + goto out; | |
26113 | + | |
26114 | + au_xino_lock_dir(sb, file, &ldir); | |
26115 | + /* mnt_want_write() is unnecessary here */ | |
26116 | + new_xino = au_xino_create2(file, file); | |
26117 | + au_xino_unlock_dir(&ldir); | |
26118 | + err = PTR_ERR(new_xino); | |
26119 | + if (IS_ERR(new_xino)) | |
26120 | + goto out; | |
26121 | + err = 0; | |
26122 | + fput(file); | |
26123 | + br->br_xino.xi_file = new_xino; | |
26124 | + | |
26125 | + h_sb = br->br_mnt->mnt_sb; | |
26126 | + for (bi = 0; bi <= bend; bi++) { | |
26127 | + if (unlikely(bi == bindex)) | |
26128 | + continue; | |
26129 | + br = au_sbr(sb, bi); | |
26130 | + if (br->br_mnt->mnt_sb != h_sb) | |
26131 | + continue; | |
26132 | + | |
26133 | + fput(br->br_xino.xi_file); | |
26134 | + br->br_xino.xi_file = new_xino; | |
26135 | + get_file(new_xino); | |
26136 | + } | |
26137 | + | |
4f0767ce | 26138 | +out: |
1facf9fc | 26139 | + return err; |
26140 | +} | |
26141 | + | |
26142 | +struct xino_do_trunc_args { | |
26143 | + struct super_block *sb; | |
26144 | + struct au_branch *br; | |
26145 | +}; | |
26146 | + | |
26147 | +static void xino_do_trunc(void *_args) | |
26148 | +{ | |
26149 | + struct xino_do_trunc_args *args = _args; | |
26150 | + struct super_block *sb; | |
26151 | + struct au_branch *br; | |
26152 | + struct inode *dir; | |
26153 | + int err; | |
26154 | + aufs_bindex_t bindex; | |
26155 | + | |
26156 | + err = 0; | |
26157 | + sb = args->sb; | |
26158 | + dir = sb->s_root->d_inode; | |
26159 | + br = args->br; | |
26160 | + | |
26161 | + si_noflush_write_lock(sb); | |
26162 | + ii_read_lock_parent(dir); | |
26163 | + bindex = au_br_index(sb, br->br_id); | |
26164 | + err = au_xino_trunc(sb, bindex); | |
dece6358 AM |
26165 | + if (!err |
26166 | + && br->br_xino.xi_file->f_dentry->d_inode->i_blocks | |
1facf9fc | 26167 | + >= br->br_xino_upper) |
26168 | + br->br_xino_upper += AUFS_XINO_TRUNC_STEP; | |
26169 | + | |
1facf9fc | 26170 | + ii_read_unlock(dir); |
26171 | + if (unlikely(err)) | |
4a4d8108 | 26172 | + pr_warning("err b%d, (%d)\n", bindex, err); |
1facf9fc | 26173 | + atomic_dec(&br->br_xino_running); |
26174 | + atomic_dec(&br->br_count); | |
26175 | + au_nwt_done(&au_sbi(sb)->si_nowait); | |
26176 | + si_write_unlock(sb); | |
26177 | + kfree(args); | |
26178 | +} | |
26179 | + | |
26180 | +static void xino_try_trunc(struct super_block *sb, struct au_branch *br) | |
26181 | +{ | |
26182 | + struct xino_do_trunc_args *args; | |
26183 | + int wkq_err; | |
26184 | + | |
26185 | + if (br->br_xino.xi_file->f_dentry->d_inode->i_blocks | |
26186 | + < br->br_xino_upper) | |
26187 | + return; | |
26188 | + | |
26189 | + if (atomic_inc_return(&br->br_xino_running) > 1) | |
26190 | + goto out; | |
26191 | + | |
26192 | + /* lock and kfree() will be called in trunc_xino() */ | |
26193 | + args = kmalloc(sizeof(*args), GFP_NOFS); | |
26194 | + if (unlikely(!args)) { | |
26195 | + AuErr1("no memory\n"); | |
26196 | + goto out_args; | |
26197 | + } | |
26198 | + | |
953406b4 | 26199 | + atomic_inc_return(&br->br_count); |
1facf9fc | 26200 | + args->sb = sb; |
26201 | + args->br = br; | |
26202 | + wkq_err = au_wkq_nowait(xino_do_trunc, args, sb); | |
26203 | + if (!wkq_err) | |
26204 | + return; /* success */ | |
26205 | + | |
4a4d8108 | 26206 | + pr_err("wkq %d\n", wkq_err); |
953406b4 | 26207 | + atomic_dec_return(&br->br_count); |
1facf9fc | 26208 | + |
4f0767ce | 26209 | +out_args: |
1facf9fc | 26210 | + kfree(args); |
4f0767ce | 26211 | +out: |
953406b4 | 26212 | + atomic_dec_return(&br->br_xino_running); |
1facf9fc | 26213 | +} |
26214 | + | |
26215 | +/* ---------------------------------------------------------------------- */ | |
26216 | + | |
26217 | +static int au_xino_do_write(au_writef_t write, struct file *file, | |
26218 | + ino_t h_ino, ino_t ino) | |
26219 | +{ | |
26220 | + loff_t pos; | |
26221 | + ssize_t sz; | |
26222 | + | |
26223 | + pos = h_ino; | |
26224 | + if (unlikely(au_loff_max / sizeof(ino) - 1 < pos)) { | |
26225 | + AuIOErr1("too large hi%lu\n", (unsigned long)h_ino); | |
26226 | + return -EFBIG; | |
26227 | + } | |
26228 | + pos *= sizeof(ino); | |
26229 | + sz = xino_fwrite(write, file, &ino, sizeof(ino), &pos); | |
26230 | + if (sz == sizeof(ino)) | |
26231 | + return 0; /* success */ | |
26232 | + | |
26233 | + AuIOErr("write failed (%zd)\n", sz); | |
26234 | + return -EIO; | |
26235 | +} | |
26236 | + | |
26237 | +/* | |
26238 | + * write @ino to the xinofile for the specified branch{@sb, @bindex} | |
26239 | + * at the position of @h_ino. | |
26240 | + * even if @ino is zero, it is written to the xinofile and means no entry. | |
26241 | + * if the size of the xino file on a specific filesystem exceeds the watermark, | |
26242 | + * try truncating it. | |
26243 | + */ | |
26244 | +int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
26245 | + ino_t ino) | |
26246 | +{ | |
26247 | + int err; | |
26248 | + unsigned int mnt_flags; | |
26249 | + struct au_branch *br; | |
26250 | + | |
26251 | + BUILD_BUG_ON(sizeof(long long) != sizeof(au_loff_max) | |
26252 | + || ((loff_t)-1) > 0); | |
dece6358 | 26253 | + SiMustAnyLock(sb); |
1facf9fc | 26254 | + |
26255 | + mnt_flags = au_mntflags(sb); | |
26256 | + if (!au_opt_test(mnt_flags, XINO)) | |
26257 | + return 0; | |
26258 | + | |
26259 | + br = au_sbr(sb, bindex); | |
26260 | + err = au_xino_do_write(au_sbi(sb)->si_xwrite, br->br_xino.xi_file, | |
26261 | + h_ino, ino); | |
26262 | + if (!err) { | |
26263 | + if (au_opt_test(mnt_flags, TRUNC_XINO) | |
26264 | + && au_test_fs_trunc_xino(br->br_mnt->mnt_sb)) | |
26265 | + xino_try_trunc(sb, br); | |
26266 | + return 0; /* success */ | |
26267 | + } | |
26268 | + | |
26269 | + AuIOErr("write failed (%d)\n", err); | |
26270 | + return -EIO; | |
26271 | +} | |
26272 | + | |
26273 | +/* ---------------------------------------------------------------------- */ | |
26274 | + | |
26275 | +/* aufs inode number bitmap */ | |
26276 | + | |
26277 | +static const int page_bits = (int)PAGE_SIZE * BITS_PER_BYTE; | |
26278 | +static ino_t xib_calc_ino(unsigned long pindex, int bit) | |
26279 | +{ | |
26280 | + ino_t ino; | |
26281 | + | |
26282 | + AuDebugOn(bit < 0 || page_bits <= bit); | |
26283 | + ino = AUFS_FIRST_INO + pindex * page_bits + bit; | |
26284 | + return ino; | |
26285 | +} | |
26286 | + | |
26287 | +static void xib_calc_bit(ino_t ino, unsigned long *pindex, int *bit) | |
26288 | +{ | |
26289 | + AuDebugOn(ino < AUFS_FIRST_INO); | |
26290 | + ino -= AUFS_FIRST_INO; | |
26291 | + *pindex = ino / page_bits; | |
26292 | + *bit = ino % page_bits; | |
26293 | +} | |
26294 | + | |
26295 | +static int xib_pindex(struct super_block *sb, unsigned long pindex) | |
26296 | +{ | |
26297 | + int err; | |
26298 | + loff_t pos; | |
26299 | + ssize_t sz; | |
26300 | + struct au_sbinfo *sbinfo; | |
26301 | + struct file *xib; | |
26302 | + unsigned long *p; | |
26303 | + | |
26304 | + sbinfo = au_sbi(sb); | |
26305 | + MtxMustLock(&sbinfo->si_xib_mtx); | |
26306 | + AuDebugOn(pindex > ULONG_MAX / PAGE_SIZE | |
26307 | + || !au_opt_test(sbinfo->si_mntflags, XINO)); | |
26308 | + | |
26309 | + if (pindex == sbinfo->si_xib_last_pindex) | |
26310 | + return 0; | |
26311 | + | |
26312 | + xib = sbinfo->si_xib; | |
26313 | + p = sbinfo->si_xib_buf; | |
26314 | + pos = sbinfo->si_xib_last_pindex; | |
26315 | + pos *= PAGE_SIZE; | |
26316 | + sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos); | |
26317 | + if (unlikely(sz != PAGE_SIZE)) | |
26318 | + goto out; | |
26319 | + | |
26320 | + pos = pindex; | |
26321 | + pos *= PAGE_SIZE; | |
26322 | + if (i_size_read(xib->f_dentry->d_inode) >= pos + PAGE_SIZE) | |
26323 | + sz = xino_fread(sbinfo->si_xread, xib, p, PAGE_SIZE, &pos); | |
26324 | + else { | |
26325 | + memset(p, 0, PAGE_SIZE); | |
26326 | + sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos); | |
26327 | + } | |
26328 | + if (sz == PAGE_SIZE) { | |
26329 | + sbinfo->si_xib_last_pindex = pindex; | |
26330 | + return 0; /* success */ | |
26331 | + } | |
26332 | + | |
4f0767ce | 26333 | +out: |
b752ccd1 AM |
26334 | + AuIOErr1("write failed (%zd)\n", sz); |
26335 | + err = sz; | |
26336 | + if (sz >= 0) | |
26337 | + err = -EIO; | |
26338 | + return err; | |
26339 | +} | |
26340 | + | |
26341 | +/* ---------------------------------------------------------------------- */ | |
26342 | + | |
26343 | +static void au_xib_clear_bit(struct inode *inode) | |
26344 | +{ | |
26345 | + int err, bit; | |
26346 | + unsigned long pindex; | |
26347 | + struct super_block *sb; | |
26348 | + struct au_sbinfo *sbinfo; | |
26349 | + | |
26350 | + AuDebugOn(inode->i_nlink); | |
26351 | + | |
26352 | + sb = inode->i_sb; | |
26353 | + xib_calc_bit(inode->i_ino, &pindex, &bit); | |
26354 | + AuDebugOn(page_bits <= bit); | |
26355 | + sbinfo = au_sbi(sb); | |
26356 | + mutex_lock(&sbinfo->si_xib_mtx); | |
26357 | + err = xib_pindex(sb, pindex); | |
26358 | + if (!err) { | |
26359 | + clear_bit(bit, sbinfo->si_xib_buf); | |
26360 | + sbinfo->si_xib_next_bit = bit; | |
26361 | + } | |
26362 | + mutex_unlock(&sbinfo->si_xib_mtx); | |
26363 | +} | |
26364 | + | |
26365 | +/* for s_op->delete_inode() */ | |
26366 | +void au_xino_delete_inode(struct inode *inode, const int unlinked) | |
26367 | +{ | |
26368 | + int err; | |
26369 | + unsigned int mnt_flags; | |
26370 | + aufs_bindex_t bindex, bend, bi; | |
26371 | + unsigned char try_trunc; | |
26372 | + struct au_iinfo *iinfo; | |
26373 | + struct super_block *sb; | |
26374 | + struct au_hinode *hi; | |
26375 | + struct inode *h_inode; | |
26376 | + struct au_branch *br; | |
26377 | + au_writef_t xwrite; | |
26378 | + | |
26379 | + sb = inode->i_sb; | |
26380 | + mnt_flags = au_mntflags(sb); | |
26381 | + if (!au_opt_test(mnt_flags, XINO) | |
26382 | + || inode->i_ino == AUFS_ROOT_INO) | |
26383 | + return; | |
26384 | + | |
26385 | + if (unlinked) { | |
26386 | + au_xigen_inc(inode); | |
26387 | + au_xib_clear_bit(inode); | |
26388 | + } | |
26389 | + | |
26390 | + iinfo = au_ii(inode); | |
26391 | + if (!iinfo) | |
26392 | + return; | |
1facf9fc | 26393 | + |
b752ccd1 AM |
26394 | + bindex = iinfo->ii_bstart; |
26395 | + if (bindex < 0) | |
26396 | + return; | |
1facf9fc | 26397 | + |
b752ccd1 AM |
26398 | + xwrite = au_sbi(sb)->si_xwrite; |
26399 | + try_trunc = !!au_opt_test(mnt_flags, TRUNC_XINO); | |
26400 | + hi = iinfo->ii_hinode + bindex; | |
26401 | + bend = iinfo->ii_bend; | |
26402 | + for (; bindex <= bend; bindex++, hi++) { | |
26403 | + h_inode = hi->hi_inode; | |
26404 | + if (!h_inode | |
26405 | + || (!unlinked && h_inode->i_nlink)) | |
26406 | + continue; | |
1facf9fc | 26407 | + |
b752ccd1 AM |
26408 | + /* inode may not be revalidated */ |
26409 | + bi = au_br_index(sb, hi->hi_id); | |
26410 | + if (bi < 0) | |
26411 | + continue; | |
1facf9fc | 26412 | + |
b752ccd1 AM |
26413 | + br = au_sbr(sb, bi); |
26414 | + err = au_xino_do_write(xwrite, br->br_xino.xi_file, | |
26415 | + h_inode->i_ino, /*ino*/0); | |
26416 | + if (!err && try_trunc | |
26417 | + && au_test_fs_trunc_xino(br->br_mnt->mnt_sb)) | |
26418 | + xino_try_trunc(sb, br); | |
1facf9fc | 26419 | + } |
1facf9fc | 26420 | +} |
26421 | + | |
26422 | +/* get an unused inode number from bitmap */ | |
26423 | +ino_t au_xino_new_ino(struct super_block *sb) | |
26424 | +{ | |
26425 | + ino_t ino; | |
26426 | + unsigned long *p, pindex, ul, pend; | |
26427 | + struct au_sbinfo *sbinfo; | |
26428 | + struct file *file; | |
26429 | + int free_bit, err; | |
26430 | + | |
26431 | + if (!au_opt_test(au_mntflags(sb), XINO)) | |
26432 | + return iunique(sb, AUFS_FIRST_INO); | |
26433 | + | |
26434 | + sbinfo = au_sbi(sb); | |
26435 | + mutex_lock(&sbinfo->si_xib_mtx); | |
26436 | + p = sbinfo->si_xib_buf; | |
26437 | + free_bit = sbinfo->si_xib_next_bit; | |
26438 | + if (free_bit < page_bits && !test_bit(free_bit, p)) | |
26439 | + goto out; /* success */ | |
26440 | + free_bit = find_first_zero_bit(p, page_bits); | |
26441 | + if (free_bit < page_bits) | |
26442 | + goto out; /* success */ | |
26443 | + | |
26444 | + pindex = sbinfo->si_xib_last_pindex; | |
26445 | + for (ul = pindex - 1; ul < ULONG_MAX; ul--) { | |
26446 | + err = xib_pindex(sb, ul); | |
26447 | + if (unlikely(err)) | |
26448 | + goto out_err; | |
26449 | + free_bit = find_first_zero_bit(p, page_bits); | |
26450 | + if (free_bit < page_bits) | |
26451 | + goto out; /* success */ | |
26452 | + } | |
26453 | + | |
26454 | + file = sbinfo->si_xib; | |
26455 | + pend = i_size_read(file->f_dentry->d_inode) / PAGE_SIZE; | |
26456 | + for (ul = pindex + 1; ul <= pend; ul++) { | |
26457 | + err = xib_pindex(sb, ul); | |
26458 | + if (unlikely(err)) | |
26459 | + goto out_err; | |
26460 | + free_bit = find_first_zero_bit(p, page_bits); | |
26461 | + if (free_bit < page_bits) | |
26462 | + goto out; /* success */ | |
26463 | + } | |
26464 | + BUG(); | |
26465 | + | |
4f0767ce | 26466 | +out: |
1facf9fc | 26467 | + set_bit(free_bit, p); |
26468 | + sbinfo->si_xib_next_bit++; | |
26469 | + pindex = sbinfo->si_xib_last_pindex; | |
26470 | + mutex_unlock(&sbinfo->si_xib_mtx); | |
26471 | + ino = xib_calc_ino(pindex, free_bit); | |
26472 | + AuDbg("i%lu\n", (unsigned long)ino); | |
26473 | + return ino; | |
4f0767ce | 26474 | +out_err: |
1facf9fc | 26475 | + mutex_unlock(&sbinfo->si_xib_mtx); |
26476 | + AuDbg("i0\n"); | |
26477 | + return 0; | |
26478 | +} | |
26479 | + | |
26480 | +/* | |
26481 | + * read @ino from xinofile for the specified branch{@sb, @bindex} | |
26482 | + * at the position of @h_ino. | |
26483 | + * if @ino does not exist and @do_new is true, get new one. | |
26484 | + */ | |
26485 | +int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
26486 | + ino_t *ino) | |
26487 | +{ | |
26488 | + int err; | |
26489 | + ssize_t sz; | |
26490 | + loff_t pos; | |
26491 | + struct file *file; | |
26492 | + struct au_sbinfo *sbinfo; | |
26493 | + | |
26494 | + *ino = 0; | |
26495 | + if (!au_opt_test(au_mntflags(sb), XINO)) | |
26496 | + return 0; /* no xino */ | |
26497 | + | |
26498 | + err = 0; | |
26499 | + sbinfo = au_sbi(sb); | |
26500 | + pos = h_ino; | |
26501 | + if (unlikely(au_loff_max / sizeof(*ino) - 1 < pos)) { | |
26502 | + AuIOErr1("too large hi%lu\n", (unsigned long)h_ino); | |
26503 | + return -EFBIG; | |
26504 | + } | |
26505 | + pos *= sizeof(*ino); | |
26506 | + | |
26507 | + file = au_sbr(sb, bindex)->br_xino.xi_file; | |
26508 | + if (i_size_read(file->f_dentry->d_inode) < pos + sizeof(*ino)) | |
26509 | + return 0; /* no ino */ | |
26510 | + | |
26511 | + sz = xino_fread(sbinfo->si_xread, file, ino, sizeof(*ino), &pos); | |
26512 | + if (sz == sizeof(*ino)) | |
26513 | + return 0; /* success */ | |
26514 | + | |
26515 | + err = sz; | |
26516 | + if (unlikely(sz >= 0)) { | |
26517 | + err = -EIO; | |
26518 | + AuIOErr("xino read error (%zd)\n", sz); | |
26519 | + } | |
26520 | + | |
26521 | + return err; | |
26522 | +} | |
26523 | + | |
26524 | +/* ---------------------------------------------------------------------- */ | |
26525 | + | |
26526 | +/* create and set a new xino file */ | |
26527 | + | |
26528 | +struct file *au_xino_create(struct super_block *sb, char *fname, int silent) | |
26529 | +{ | |
26530 | + struct file *file; | |
26531 | + struct dentry *h_parent, *d; | |
26532 | + struct inode *h_dir; | |
26533 | + int err; | |
26534 | + | |
26535 | + /* | |
26536 | + * at mount-time, and the xino file is the default path, | |
4a4d8108 | 26537 | + * hnotify is disabled so we have no notify events to ignore. |
1facf9fc | 26538 | + * when a user specified the xino, we cannot get au_hdir to be ignored. |
26539 | + */ | |
26540 | + file = vfsub_filp_open(fname, O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE, | |
26541 | + S_IRUGO | S_IWUGO); | |
26542 | + if (IS_ERR(file)) { | |
26543 | + if (!silent) | |
4a4d8108 | 26544 | + pr_err("open %s(%ld)\n", fname, PTR_ERR(file)); |
1facf9fc | 26545 | + return file; |
26546 | + } | |
26547 | + | |
26548 | + /* keep file count */ | |
26549 | + h_parent = dget_parent(file->f_dentry); | |
26550 | + h_dir = h_parent->d_inode; | |
26551 | + mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT); | |
26552 | + /* mnt_want_write() is unnecessary here */ | |
26553 | + err = vfsub_unlink(h_dir, &file->f_path, /*force*/0); | |
26554 | + mutex_unlock(&h_dir->i_mutex); | |
26555 | + dput(h_parent); | |
26556 | + if (unlikely(err)) { | |
26557 | + if (!silent) | |
4a4d8108 | 26558 | + pr_err("unlink %s(%d)\n", fname, err); |
1facf9fc | 26559 | + goto out; |
26560 | + } | |
26561 | + | |
26562 | + err = -EINVAL; | |
26563 | + d = file->f_dentry; | |
26564 | + if (unlikely(sb == d->d_sb)) { | |
26565 | + if (!silent) | |
4a4d8108 | 26566 | + pr_err("%s must be outside\n", fname); |
1facf9fc | 26567 | + goto out; |
26568 | + } | |
26569 | + if (unlikely(au_test_fs_bad_xino(d->d_sb))) { | |
26570 | + if (!silent) | |
4a4d8108 AM |
26571 | + pr_err("xino doesn't support %s(%s)\n", |
26572 | + fname, au_sbtype(d->d_sb)); | |
1facf9fc | 26573 | + goto out; |
26574 | + } | |
26575 | + return file; /* success */ | |
26576 | + | |
4f0767ce | 26577 | +out: |
1facf9fc | 26578 | + fput(file); |
26579 | + file = ERR_PTR(err); | |
26580 | + return file; | |
26581 | +} | |
26582 | + | |
26583 | +/* | |
26584 | + * find another branch who is on the same filesystem of the specified | |
26585 | + * branch{@btgt}. search until @bend. | |
26586 | + */ | |
26587 | +static int is_sb_shared(struct super_block *sb, aufs_bindex_t btgt, | |
26588 | + aufs_bindex_t bend) | |
26589 | +{ | |
26590 | + aufs_bindex_t bindex; | |
26591 | + struct super_block *tgt_sb = au_sbr_sb(sb, btgt); | |
26592 | + | |
26593 | + for (bindex = 0; bindex < btgt; bindex++) | |
26594 | + if (unlikely(tgt_sb == au_sbr_sb(sb, bindex))) | |
26595 | + return bindex; | |
26596 | + for (bindex++; bindex <= bend; bindex++) | |
26597 | + if (unlikely(tgt_sb == au_sbr_sb(sb, bindex))) | |
26598 | + return bindex; | |
26599 | + return -1; | |
26600 | +} | |
26601 | + | |
26602 | +/* ---------------------------------------------------------------------- */ | |
26603 | + | |
26604 | +/* | |
26605 | + * initialize the xinofile for the specified branch @br | |
26606 | + * at the place/path where @base_file indicates. | |
26607 | + * test whether another branch is on the same filesystem or not, | |
26608 | + * if @do_test is true. | |
26609 | + */ | |
26610 | +int au_xino_br(struct super_block *sb, struct au_branch *br, ino_t h_ino, | |
26611 | + struct file *base_file, int do_test) | |
26612 | +{ | |
26613 | + int err; | |
26614 | + ino_t ino; | |
26615 | + aufs_bindex_t bend, bindex; | |
26616 | + struct au_branch *shared_br, *b; | |
26617 | + struct file *file; | |
26618 | + struct super_block *tgt_sb; | |
26619 | + | |
26620 | + shared_br = NULL; | |
26621 | + bend = au_sbend(sb); | |
26622 | + if (do_test) { | |
26623 | + tgt_sb = br->br_mnt->mnt_sb; | |
26624 | + for (bindex = 0; bindex <= bend; bindex++) { | |
26625 | + b = au_sbr(sb, bindex); | |
26626 | + if (tgt_sb == b->br_mnt->mnt_sb) { | |
26627 | + shared_br = b; | |
26628 | + break; | |
26629 | + } | |
26630 | + } | |
26631 | + } | |
26632 | + | |
26633 | + if (!shared_br || !shared_br->br_xino.xi_file) { | |
26634 | + struct au_xino_lock_dir ldir; | |
26635 | + | |
26636 | + au_xino_lock_dir(sb, base_file, &ldir); | |
26637 | + /* mnt_want_write() is unnecessary here */ | |
26638 | + file = au_xino_create2(base_file, NULL); | |
26639 | + au_xino_unlock_dir(&ldir); | |
26640 | + err = PTR_ERR(file); | |
26641 | + if (IS_ERR(file)) | |
26642 | + goto out; | |
26643 | + br->br_xino.xi_file = file; | |
26644 | + } else { | |
26645 | + br->br_xino.xi_file = shared_br->br_xino.xi_file; | |
26646 | + get_file(br->br_xino.xi_file); | |
26647 | + } | |
26648 | + | |
26649 | + ino = AUFS_ROOT_INO; | |
26650 | + err = au_xino_do_write(au_sbi(sb)->si_xwrite, br->br_xino.xi_file, | |
26651 | + h_ino, ino); | |
b752ccd1 AM |
26652 | + if (unlikely(err)) { |
26653 | + fput(br->br_xino.xi_file); | |
26654 | + br->br_xino.xi_file = NULL; | |
26655 | + } | |
1facf9fc | 26656 | + |
4f0767ce | 26657 | +out: |
1facf9fc | 26658 | + return err; |
26659 | +} | |
26660 | + | |
26661 | +/* ---------------------------------------------------------------------- */ | |
26662 | + | |
26663 | +/* trucate a xino bitmap file */ | |
26664 | + | |
26665 | +/* todo: slow */ | |
26666 | +static int do_xib_restore(struct super_block *sb, struct file *file, void *page) | |
26667 | +{ | |
26668 | + int err, bit; | |
26669 | + ssize_t sz; | |
26670 | + unsigned long pindex; | |
26671 | + loff_t pos, pend; | |
26672 | + struct au_sbinfo *sbinfo; | |
26673 | + au_readf_t func; | |
26674 | + ino_t *ino; | |
26675 | + unsigned long *p; | |
26676 | + | |
26677 | + err = 0; | |
26678 | + sbinfo = au_sbi(sb); | |
dece6358 | 26679 | + MtxMustLock(&sbinfo->si_xib_mtx); |
1facf9fc | 26680 | + p = sbinfo->si_xib_buf; |
26681 | + func = sbinfo->si_xread; | |
26682 | + pend = i_size_read(file->f_dentry->d_inode); | |
26683 | + pos = 0; | |
26684 | + while (pos < pend) { | |
26685 | + sz = xino_fread(func, file, page, PAGE_SIZE, &pos); | |
26686 | + err = sz; | |
26687 | + if (unlikely(sz <= 0)) | |
26688 | + goto out; | |
26689 | + | |
26690 | + err = 0; | |
26691 | + for (ino = page; sz > 0; ino++, sz -= sizeof(ino)) { | |
26692 | + if (unlikely(*ino < AUFS_FIRST_INO)) | |
26693 | + continue; | |
26694 | + | |
26695 | + xib_calc_bit(*ino, &pindex, &bit); | |
26696 | + AuDebugOn(page_bits <= bit); | |
26697 | + err = xib_pindex(sb, pindex); | |
26698 | + if (!err) | |
26699 | + set_bit(bit, p); | |
26700 | + else | |
26701 | + goto out; | |
26702 | + } | |
26703 | + } | |
26704 | + | |
4f0767ce | 26705 | +out: |
1facf9fc | 26706 | + return err; |
26707 | +} | |
26708 | + | |
26709 | +static int xib_restore(struct super_block *sb) | |
26710 | +{ | |
26711 | + int err; | |
26712 | + aufs_bindex_t bindex, bend; | |
26713 | + void *page; | |
26714 | + | |
26715 | + err = -ENOMEM; | |
26716 | + page = (void *)__get_free_page(GFP_NOFS); | |
26717 | + if (unlikely(!page)) | |
26718 | + goto out; | |
26719 | + | |
26720 | + err = 0; | |
26721 | + bend = au_sbend(sb); | |
26722 | + for (bindex = 0; !err && bindex <= bend; bindex++) | |
26723 | + if (!bindex || is_sb_shared(sb, bindex, bindex - 1) < 0) | |
26724 | + err = do_xib_restore | |
26725 | + (sb, au_sbr(sb, bindex)->br_xino.xi_file, page); | |
26726 | + else | |
26727 | + AuDbg("b%d\n", bindex); | |
26728 | + free_page((unsigned long)page); | |
26729 | + | |
4f0767ce | 26730 | +out: |
1facf9fc | 26731 | + return err; |
26732 | +} | |
26733 | + | |
26734 | +int au_xib_trunc(struct super_block *sb) | |
26735 | +{ | |
26736 | + int err; | |
26737 | + ssize_t sz; | |
26738 | + loff_t pos; | |
26739 | + struct au_xino_lock_dir ldir; | |
26740 | + struct au_sbinfo *sbinfo; | |
26741 | + unsigned long *p; | |
26742 | + struct file *file; | |
26743 | + | |
dece6358 AM |
26744 | + SiMustWriteLock(sb); |
26745 | + | |
1facf9fc | 26746 | + err = 0; |
26747 | + sbinfo = au_sbi(sb); | |
26748 | + if (!au_opt_test(sbinfo->si_mntflags, XINO)) | |
26749 | + goto out; | |
26750 | + | |
26751 | + file = sbinfo->si_xib; | |
26752 | + if (i_size_read(file->f_dentry->d_inode) <= PAGE_SIZE) | |
26753 | + goto out; | |
26754 | + | |
26755 | + au_xino_lock_dir(sb, file, &ldir); | |
26756 | + /* mnt_want_write() is unnecessary here */ | |
26757 | + file = au_xino_create2(sbinfo->si_xib, NULL); | |
26758 | + au_xino_unlock_dir(&ldir); | |
26759 | + err = PTR_ERR(file); | |
26760 | + if (IS_ERR(file)) | |
26761 | + goto out; | |
26762 | + fput(sbinfo->si_xib); | |
26763 | + sbinfo->si_xib = file; | |
26764 | + | |
26765 | + p = sbinfo->si_xib_buf; | |
26766 | + memset(p, 0, PAGE_SIZE); | |
26767 | + pos = 0; | |
26768 | + sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xib, p, PAGE_SIZE, &pos); | |
26769 | + if (unlikely(sz != PAGE_SIZE)) { | |
26770 | + err = sz; | |
26771 | + AuIOErr("err %d\n", err); | |
26772 | + if (sz >= 0) | |
26773 | + err = -EIO; | |
26774 | + goto out; | |
26775 | + } | |
26776 | + | |
26777 | + mutex_lock(&sbinfo->si_xib_mtx); | |
26778 | + /* mnt_want_write() is unnecessary here */ | |
26779 | + err = xib_restore(sb); | |
26780 | + mutex_unlock(&sbinfo->si_xib_mtx); | |
26781 | + | |
26782 | +out: | |
26783 | + return err; | |
26784 | +} | |
26785 | + | |
26786 | +/* ---------------------------------------------------------------------- */ | |
26787 | + | |
26788 | +/* | |
26789 | + * xino mount option handlers | |
26790 | + */ | |
26791 | +static au_readf_t find_readf(struct file *h_file) | |
26792 | +{ | |
26793 | + const struct file_operations *fop = h_file->f_op; | |
26794 | + | |
26795 | + if (fop) { | |
26796 | + if (fop->read) | |
26797 | + return fop->read; | |
26798 | + if (fop->aio_read) | |
26799 | + return do_sync_read; | |
26800 | + } | |
26801 | + return ERR_PTR(-ENOSYS); | |
26802 | +} | |
26803 | + | |
26804 | +static au_writef_t find_writef(struct file *h_file) | |
26805 | +{ | |
26806 | + const struct file_operations *fop = h_file->f_op; | |
26807 | + | |
26808 | + if (fop) { | |
26809 | + if (fop->write) | |
26810 | + return fop->write; | |
26811 | + if (fop->aio_write) | |
26812 | + return do_sync_write; | |
26813 | + } | |
26814 | + return ERR_PTR(-ENOSYS); | |
26815 | +} | |
26816 | + | |
26817 | +/* xino bitmap */ | |
26818 | +static void xino_clear_xib(struct super_block *sb) | |
26819 | +{ | |
26820 | + struct au_sbinfo *sbinfo; | |
26821 | + | |
dece6358 AM |
26822 | + SiMustWriteLock(sb); |
26823 | + | |
1facf9fc | 26824 | + sbinfo = au_sbi(sb); |
26825 | + sbinfo->si_xread = NULL; | |
26826 | + sbinfo->si_xwrite = NULL; | |
26827 | + if (sbinfo->si_xib) | |
26828 | + fput(sbinfo->si_xib); | |
26829 | + sbinfo->si_xib = NULL; | |
26830 | + free_page((unsigned long)sbinfo->si_xib_buf); | |
26831 | + sbinfo->si_xib_buf = NULL; | |
26832 | +} | |
26833 | + | |
26834 | +static int au_xino_set_xib(struct super_block *sb, struct file *base) | |
26835 | +{ | |
26836 | + int err; | |
26837 | + loff_t pos; | |
26838 | + struct au_sbinfo *sbinfo; | |
26839 | + struct file *file; | |
26840 | + | |
dece6358 AM |
26841 | + SiMustWriteLock(sb); |
26842 | + | |
1facf9fc | 26843 | + sbinfo = au_sbi(sb); |
26844 | + file = au_xino_create2(base, sbinfo->si_xib); | |
26845 | + err = PTR_ERR(file); | |
26846 | + if (IS_ERR(file)) | |
26847 | + goto out; | |
26848 | + if (sbinfo->si_xib) | |
26849 | + fput(sbinfo->si_xib); | |
26850 | + sbinfo->si_xib = file; | |
26851 | + sbinfo->si_xread = find_readf(file); | |
26852 | + sbinfo->si_xwrite = find_writef(file); | |
26853 | + | |
26854 | + err = -ENOMEM; | |
26855 | + if (!sbinfo->si_xib_buf) | |
26856 | + sbinfo->si_xib_buf = (void *)get_zeroed_page(GFP_NOFS); | |
26857 | + if (unlikely(!sbinfo->si_xib_buf)) | |
26858 | + goto out_unset; | |
26859 | + | |
26860 | + sbinfo->si_xib_last_pindex = 0; | |
26861 | + sbinfo->si_xib_next_bit = 0; | |
26862 | + if (i_size_read(file->f_dentry->d_inode) < PAGE_SIZE) { | |
26863 | + pos = 0; | |
26864 | + err = xino_fwrite(sbinfo->si_xwrite, file, sbinfo->si_xib_buf, | |
26865 | + PAGE_SIZE, &pos); | |
26866 | + if (unlikely(err != PAGE_SIZE)) | |
26867 | + goto out_free; | |
26868 | + } | |
26869 | + err = 0; | |
26870 | + goto out; /* success */ | |
26871 | + | |
4f0767ce | 26872 | +out_free: |
1facf9fc | 26873 | + free_page((unsigned long)sbinfo->si_xib_buf); |
b752ccd1 AM |
26874 | + sbinfo->si_xib_buf = NULL; |
26875 | + if (err >= 0) | |
26876 | + err = -EIO; | |
4f0767ce | 26877 | +out_unset: |
b752ccd1 AM |
26878 | + fput(sbinfo->si_xib); |
26879 | + sbinfo->si_xib = NULL; | |
26880 | + sbinfo->si_xread = NULL; | |
26881 | + sbinfo->si_xwrite = NULL; | |
4f0767ce | 26882 | +out: |
b752ccd1 | 26883 | + return err; |
1facf9fc | 26884 | +} |
26885 | + | |
b752ccd1 AM |
26886 | +/* xino for each branch */ |
26887 | +static void xino_clear_br(struct super_block *sb) | |
26888 | +{ | |
26889 | + aufs_bindex_t bindex, bend; | |
26890 | + struct au_branch *br; | |
1facf9fc | 26891 | + |
b752ccd1 AM |
26892 | + bend = au_sbend(sb); |
26893 | + for (bindex = 0; bindex <= bend; bindex++) { | |
26894 | + br = au_sbr(sb, bindex); | |
26895 | + if (!br || !br->br_xino.xi_file) | |
26896 | + continue; | |
26897 | + | |
26898 | + fput(br->br_xino.xi_file); | |
26899 | + br->br_xino.xi_file = NULL; | |
26900 | + } | |
26901 | +} | |
26902 | + | |
26903 | +static int au_xino_set_br(struct super_block *sb, struct file *base) | |
1facf9fc | 26904 | +{ |
26905 | + int err; | |
b752ccd1 AM |
26906 | + ino_t ino; |
26907 | + aufs_bindex_t bindex, bend, bshared; | |
26908 | + struct { | |
26909 | + struct file *old, *new; | |
26910 | + } *fpair, *p; | |
26911 | + struct au_branch *br; | |
26912 | + struct inode *inode; | |
26913 | + au_writef_t writef; | |
1facf9fc | 26914 | + |
b752ccd1 AM |
26915 | + SiMustWriteLock(sb); |
26916 | + | |
26917 | + err = -ENOMEM; | |
26918 | + bend = au_sbend(sb); | |
26919 | + fpair = kcalloc(bend + 1, sizeof(*fpair), GFP_NOFS); | |
26920 | + if (unlikely(!fpair)) | |
1facf9fc | 26921 | + goto out; |
26922 | + | |
b752ccd1 AM |
26923 | + inode = sb->s_root->d_inode; |
26924 | + ino = AUFS_ROOT_INO; | |
26925 | + writef = au_sbi(sb)->si_xwrite; | |
26926 | + for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++) { | |
26927 | + br = au_sbr(sb, bindex); | |
26928 | + bshared = is_sb_shared(sb, bindex, bindex - 1); | |
26929 | + if (bshared >= 0) { | |
26930 | + /* shared xino */ | |
26931 | + *p = fpair[bshared]; | |
26932 | + get_file(p->new); | |
26933 | + } | |
26934 | + | |
26935 | + if (!p->new) { | |
26936 | + /* new xino */ | |
26937 | + p->old = br->br_xino.xi_file; | |
26938 | + p->new = au_xino_create2(base, br->br_xino.xi_file); | |
26939 | + err = PTR_ERR(p->new); | |
26940 | + if (IS_ERR(p->new)) { | |
26941 | + p->new = NULL; | |
26942 | + goto out_pair; | |
26943 | + } | |
26944 | + } | |
26945 | + | |
26946 | + err = au_xino_do_write(writef, p->new, | |
26947 | + au_h_iptr(inode, bindex)->i_ino, ino); | |
26948 | + if (unlikely(err)) | |
26949 | + goto out_pair; | |
26950 | + } | |
26951 | + | |
26952 | + for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++) { | |
26953 | + br = au_sbr(sb, bindex); | |
26954 | + if (br->br_xino.xi_file) | |
26955 | + fput(br->br_xino.xi_file); | |
26956 | + get_file(p->new); | |
26957 | + br->br_xino.xi_file = p->new; | |
26958 | + } | |
1facf9fc | 26959 | + |
4f0767ce | 26960 | +out_pair: |
b752ccd1 AM |
26961 | + for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++) |
26962 | + if (p->new) | |
26963 | + fput(p->new); | |
26964 | + else | |
26965 | + break; | |
26966 | + kfree(fpair); | |
4f0767ce | 26967 | +out: |
1facf9fc | 26968 | + return err; |
26969 | +} | |
b752ccd1 AM |
26970 | + |
26971 | +void au_xino_clr(struct super_block *sb) | |
26972 | +{ | |
26973 | + struct au_sbinfo *sbinfo; | |
26974 | + | |
26975 | + au_xigen_clr(sb); | |
26976 | + xino_clear_xib(sb); | |
26977 | + xino_clear_br(sb); | |
26978 | + sbinfo = au_sbi(sb); | |
26979 | + /* lvalue, do not call au_mntflags() */ | |
26980 | + au_opt_clr(sbinfo->si_mntflags, XINO); | |
26981 | +} | |
26982 | + | |
26983 | +int au_xino_set(struct super_block *sb, struct au_opt_xino *xino, int remount) | |
26984 | +{ | |
26985 | + int err, skip; | |
26986 | + struct dentry *parent, *cur_parent; | |
26987 | + struct qstr *dname, *cur_name; | |
26988 | + struct file *cur_xino; | |
26989 | + struct inode *dir; | |
26990 | + struct au_sbinfo *sbinfo; | |
26991 | + | |
26992 | + SiMustWriteLock(sb); | |
26993 | + | |
26994 | + err = 0; | |
26995 | + sbinfo = au_sbi(sb); | |
26996 | + parent = dget_parent(xino->file->f_dentry); | |
26997 | + if (remount) { | |
26998 | + skip = 0; | |
26999 | + dname = &xino->file->f_dentry->d_name; | |
27000 | + cur_xino = sbinfo->si_xib; | |
27001 | + if (cur_xino) { | |
27002 | + cur_parent = dget_parent(cur_xino->f_dentry); | |
27003 | + cur_name = &cur_xino->f_dentry->d_name; | |
27004 | + skip = (cur_parent == parent | |
27005 | + && dname->len == cur_name->len | |
27006 | + && !memcmp(dname->name, cur_name->name, | |
27007 | + dname->len)); | |
27008 | + dput(cur_parent); | |
27009 | + } | |
27010 | + if (skip) | |
27011 | + goto out; | |
27012 | + } | |
27013 | + | |
27014 | + au_opt_set(sbinfo->si_mntflags, XINO); | |
27015 | + dir = parent->d_inode; | |
27016 | + mutex_lock_nested(&dir->i_mutex, AuLsc_I_PARENT); | |
27017 | + /* mnt_want_write() is unnecessary here */ | |
27018 | + err = au_xino_set_xib(sb, xino->file); | |
27019 | + if (!err) | |
27020 | + err = au_xigen_set(sb, xino->file); | |
27021 | + if (!err) | |
27022 | + err = au_xino_set_br(sb, xino->file); | |
27023 | + mutex_unlock(&dir->i_mutex); | |
27024 | + if (!err) | |
27025 | + goto out; /* success */ | |
27026 | + | |
27027 | + /* reset all */ | |
27028 | + AuIOErr("failed creating xino(%d).\n", err); | |
27029 | + | |
4f0767ce | 27030 | +out: |
b752ccd1 AM |
27031 | + dput(parent); |
27032 | + return err; | |
27033 | +} | |
27034 | + | |
27035 | +/* ---------------------------------------------------------------------- */ | |
27036 | + | |
27037 | +/* | |
27038 | + * create a xinofile at the default place/path. | |
27039 | + */ | |
27040 | +struct file *au_xino_def(struct super_block *sb) | |
27041 | +{ | |
27042 | + struct file *file; | |
27043 | + char *page, *p; | |
27044 | + struct au_branch *br; | |
27045 | + struct super_block *h_sb; | |
27046 | + struct path path; | |
27047 | + aufs_bindex_t bend, bindex, bwr; | |
27048 | + | |
27049 | + br = NULL; | |
27050 | + bend = au_sbend(sb); | |
27051 | + bwr = -1; | |
27052 | + for (bindex = 0; bindex <= bend; bindex++) { | |
27053 | + br = au_sbr(sb, bindex); | |
27054 | + if (au_br_writable(br->br_perm) | |
27055 | + && !au_test_fs_bad_xino(br->br_mnt->mnt_sb)) { | |
27056 | + bwr = bindex; | |
27057 | + break; | |
27058 | + } | |
27059 | + } | |
27060 | + | |
27061 | + if (bwr >= 0) { | |
27062 | + file = ERR_PTR(-ENOMEM); | |
27063 | + page = __getname_gfp(GFP_NOFS); | |
27064 | + if (unlikely(!page)) | |
27065 | + goto out; | |
27066 | + path.mnt = br->br_mnt; | |
27067 | + path.dentry = au_h_dptr(sb->s_root, bwr); | |
27068 | + p = d_path(&path, page, PATH_MAX - sizeof(AUFS_XINO_FNAME)); | |
27069 | + file = (void *)p; | |
27070 | + if (!IS_ERR(p)) { | |
27071 | + strcat(p, "/" AUFS_XINO_FNAME); | |
27072 | + AuDbg("%s\n", p); | |
27073 | + file = au_xino_create(sb, p, /*silent*/0); | |
27074 | + if (!IS_ERR(file)) | |
27075 | + au_xino_brid_set(sb, br->br_id); | |
27076 | + } | |
27077 | + __putname(page); | |
27078 | + } else { | |
27079 | + file = au_xino_create(sb, AUFS_XINO_DEFPATH, /*silent*/0); | |
27080 | + if (IS_ERR(file)) | |
27081 | + goto out; | |
27082 | + h_sb = file->f_dentry->d_sb; | |
27083 | + if (unlikely(au_test_fs_bad_xino(h_sb))) { | |
27084 | + pr_err("xino doesn't support %s(%s)\n", | |
27085 | + AUFS_XINO_DEFPATH, au_sbtype(h_sb)); | |
27086 | + fput(file); | |
27087 | + file = ERR_PTR(-EINVAL); | |
27088 | + } | |
27089 | + if (!IS_ERR(file)) | |
27090 | + au_xino_brid_set(sb, -1); | |
27091 | + } | |
27092 | + | |
4f0767ce | 27093 | +out: |
b752ccd1 AM |
27094 | + return file; |
27095 | +} | |
27096 | + | |
27097 | +/* ---------------------------------------------------------------------- */ | |
27098 | + | |
27099 | +int au_xino_path(struct seq_file *seq, struct file *file) | |
27100 | +{ | |
27101 | + int err; | |
27102 | + | |
27103 | + err = au_seq_path(seq, &file->f_path); | |
27104 | + if (unlikely(err < 0)) | |
27105 | + goto out; | |
27106 | + | |
27107 | + err = 0; | |
27108 | +#define Deleted "\\040(deleted)" | |
27109 | + seq->count -= sizeof(Deleted) - 1; | |
27110 | + AuDebugOn(memcmp(seq->buf + seq->count, Deleted, | |
27111 | + sizeof(Deleted) - 1)); | |
27112 | +#undef Deleted | |
27113 | + | |
4f0767ce | 27114 | +out: |
b752ccd1 AM |
27115 | + return err; |
27116 | +} | |
27117 | diff -urN /usr/share/empty/include/linux/aufs_type.h linux/include/linux/aufs_type.h | |
27118 | --- /usr/share/empty/include/linux/aufs_type.h 1970-01-01 01:00:00.000000000 +0100 | |
953406b4 AM |
27119 | +++ linux/include/linux/aufs_type.h 2010-10-21 09:52:43.096959416 +0200 |
27120 | @@ -0,0 +1,198 @@ | |
1facf9fc | 27121 | +/* |
4a4d8108 | 27122 | + * Copyright (C) 2005-2010 Junjiro R. Okajima |
1facf9fc | 27123 | + * |
27124 | + * This program, aufs is free software; you can redistribute it and/or modify | |
27125 | + * it under the terms of the GNU General Public License as published by | |
27126 | + * the Free Software Foundation; either version 2 of the License, or | |
27127 | + * (at your option) any later version. | |
dece6358 AM |
27128 | + * |
27129 | + * This program is distributed in the hope that it will be useful, | |
27130 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27131 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27132 | + * GNU General Public License for more details. | |
27133 | + * | |
27134 | + * You should have received a copy of the GNU General Public License | |
27135 | + * along with this program; if not, write to the Free Software | |
27136 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 27137 | + */ |
27138 | + | |
27139 | +#ifndef __AUFS_TYPE_H__ | |
27140 | +#define __AUFS_TYPE_H__ | |
27141 | + | |
27142 | +#include <linux/ioctl.h> | |
953406b4 AM |
27143 | +/* for those who didn't "make headers_install" */ |
27144 | +#ifdef __KERNEL__ | |
4a4d8108 | 27145 | +#include <linux/kernel.h> |
953406b4 | 27146 | +#endif |
4a4d8108 | 27147 | +#include <linux/limits.h> |
1308ab2a | 27148 | +#include <linux/types.h> |
1facf9fc | 27149 | + |
953406b4 | 27150 | +#define AUFS_VERSION "2-standalone.tree-36-rcN-20100823" |
1facf9fc | 27151 | + |
27152 | +/* todo? move this to linux-2.6.19/include/magic.h */ | |
27153 | +#define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's') | |
27154 | + | |
27155 | +/* ---------------------------------------------------------------------- */ | |
27156 | + | |
27157 | +#ifdef CONFIG_AUFS_BRANCH_MAX_127 | |
1308ab2a | 27158 | +typedef __s8 aufs_bindex_t; |
1facf9fc | 27159 | +#define AUFS_BRANCH_MAX 127 |
27160 | +#else | |
1308ab2a | 27161 | +typedef __s16 aufs_bindex_t; |
1facf9fc | 27162 | +#ifdef CONFIG_AUFS_BRANCH_MAX_511 |
27163 | +#define AUFS_BRANCH_MAX 511 | |
27164 | +#elif defined(CONFIG_AUFS_BRANCH_MAX_1023) | |
27165 | +#define AUFS_BRANCH_MAX 1023 | |
27166 | +#elif defined(CONFIG_AUFS_BRANCH_MAX_32767) | |
27167 | +#define AUFS_BRANCH_MAX 32767 | |
27168 | +#endif | |
27169 | +#endif | |
27170 | + | |
27171 | +#ifdef __KERNEL__ | |
27172 | +#ifndef AUFS_BRANCH_MAX | |
27173 | +#error unknown CONFIG_AUFS_BRANCH_MAX value | |
27174 | +#endif | |
27175 | +#endif /* __KERNEL__ */ | |
27176 | + | |
27177 | +/* ---------------------------------------------------------------------- */ | |
27178 | + | |
27179 | +#define AUFS_NAME "aufs" | |
27180 | +#define AUFS_FSTYPE AUFS_NAME | |
27181 | + | |
27182 | +#define AUFS_ROOT_INO 2 | |
27183 | +#define AUFS_FIRST_INO 11 | |
27184 | + | |
27185 | +#define AUFS_WH_PFX ".wh." | |
27186 | +#define AUFS_WH_PFX_LEN ((int)sizeof(AUFS_WH_PFX) - 1) | |
4a4d8108 AM |
27187 | +#define AUFS_WH_TMP_LEN 4 |
27188 | +/* a limit for rmdir/rename a dir */ | |
27189 | +#define AUFS_MAX_NAMELEN (NAME_MAX \ | |
27190 | + - AUFS_WH_PFX_LEN * 2 /* doubly whiteouted */\ | |
27191 | + - 1 /* dot */\ | |
27192 | + - AUFS_WH_TMP_LEN) /* hex */ | |
1facf9fc | 27193 | +#define AUFS_XINO_FNAME "." AUFS_NAME ".xino" |
27194 | +#define AUFS_XINO_DEFPATH "/tmp/" AUFS_XINO_FNAME | |
27195 | +#define AUFS_XINO_TRUNC_INIT 64 /* blocks */ | |
27196 | +#define AUFS_XINO_TRUNC_STEP 4 /* blocks */ | |
27197 | +#define AUFS_DIRWH_DEF 3 | |
27198 | +#define AUFS_RDCACHE_DEF 10 /* seconds */ | |
27199 | +#define AUFS_RDBLK_DEF 512 /* bytes */ | |
27200 | +#define AUFS_RDHASH_DEF 32 | |
27201 | +#define AUFS_WKQ_NAME AUFS_NAME "d" | |
b752ccd1 | 27202 | +#define AUFS_WKQ_PRE_NAME AUFS_WKQ_NAME "_pre" |
1facf9fc | 27203 | +#define AUFS_MFS_SECOND_DEF 30 /* seconds */ |
27204 | +#define AUFS_PLINK_WARN 100 /* number of plinks */ | |
27205 | + | |
27206 | +#define AUFS_DIROPQ_NAME AUFS_WH_PFX ".opq" /* whiteouted doubly */ | |
27207 | +#define AUFS_WH_DIROPQ AUFS_WH_PFX AUFS_DIROPQ_NAME | |
27208 | + | |
27209 | +#define AUFS_BASE_NAME AUFS_WH_PFX AUFS_NAME | |
27210 | +#define AUFS_PLINKDIR_NAME AUFS_WH_PFX "plnk" | |
27211 | +#define AUFS_ORPHDIR_NAME AUFS_WH_PFX "orph" | |
27212 | + | |
27213 | +/* doubly whiteouted */ | |
27214 | +#define AUFS_WH_BASE AUFS_WH_PFX AUFS_BASE_NAME | |
27215 | +#define AUFS_WH_PLINKDIR AUFS_WH_PFX AUFS_PLINKDIR_NAME | |
27216 | +#define AUFS_WH_ORPHDIR AUFS_WH_PFX AUFS_ORPHDIR_NAME | |
27217 | + | |
27218 | +/* branch permission */ | |
27219 | +#define AUFS_BRPERM_RW "rw" | |
27220 | +#define AUFS_BRPERM_RO "ro" | |
27221 | +#define AUFS_BRPERM_RR "rr" | |
27222 | +#define AUFS_BRPERM_WH "wh" | |
27223 | +#define AUFS_BRPERM_NLWH "nolwh" | |
27224 | +#define AUFS_BRPERM_ROWH AUFS_BRPERM_RO "+" AUFS_BRPERM_WH | |
27225 | +#define AUFS_BRPERM_RRWH AUFS_BRPERM_RR "+" AUFS_BRPERM_WH | |
27226 | +#define AUFS_BRPERM_RWNLWH AUFS_BRPERM_RW "+" AUFS_BRPERM_NLWH | |
27227 | + | |
27228 | +/* ---------------------------------------------------------------------- */ | |
27229 | + | |
27230 | +/* ioctl */ | |
27231 | +enum { | |
953406b4 AM |
27232 | + AuCtl_PLINK_MAINT, |
27233 | + AuCtl_PLINK_CLEAN, | |
27234 | + | |
1308ab2a | 27235 | + /* readdir in userspace */ |
27236 | + AuCtl_RDU, | |
4a4d8108 AM |
27237 | + AuCtl_RDU_INO, |
27238 | + | |
27239 | + /* pathconf wrapper */ | |
27240 | + AuCtl_WBR_FD | |
1308ab2a | 27241 | +}; |
27242 | + | |
27243 | +/* borrowed from linux/include/linux/kernel.h */ | |
27244 | +#ifndef ALIGN | |
27245 | +#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1) | |
27246 | +#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask)) | |
27247 | +#endif | |
27248 | + | |
27249 | +/* borrowed from linux/include/linux/compiler-gcc3.h */ | |
27250 | +#ifndef __aligned | |
27251 | +#define __aligned(x) __attribute__((aligned(x))) | |
27252 | +#define __packed __attribute__((packed)) | |
27253 | +#endif | |
27254 | + | |
27255 | +struct au_rdu_cookie { | |
27256 | + __u64 h_pos; | |
27257 | + __s16 bindex; | |
27258 | + __u8 flags; | |
27259 | + __u8 pad; | |
27260 | + __u32 generation; | |
27261 | +} __aligned(8); | |
27262 | + | |
27263 | +struct au_rdu_ent { | |
27264 | + __u64 ino; | |
27265 | + __s16 bindex; | |
27266 | + __u8 type; | |
27267 | + __u8 nlen; | |
27268 | + __u8 wh; | |
27269 | + char name[0]; | |
27270 | +} __aligned(8); | |
27271 | + | |
27272 | +static inline int au_rdu_len(int nlen) | |
27273 | +{ | |
27274 | + /* include the terminating NULL */ | |
27275 | + return ALIGN(sizeof(struct au_rdu_ent) + nlen + 1, | |
27276 | + sizeof(__u64)); | |
27277 | +} | |
27278 | + | |
27279 | +union au_rdu_ent_ul { | |
27280 | + struct au_rdu_ent __user *e; | |
b752ccd1 | 27281 | + __u64 ul; |
1308ab2a | 27282 | +}; |
27283 | + | |
27284 | +enum { | |
27285 | + AufsCtlRduV_SZ, | |
1308ab2a | 27286 | + AufsCtlRduV_End |
1facf9fc | 27287 | +}; |
27288 | + | |
1308ab2a | 27289 | +struct aufs_rdu { |
27290 | + /* input */ | |
27291 | + union { | |
27292 | + __u64 sz; /* AuCtl_RDU */ | |
27293 | + __u64 nent; /* AuCtl_RDU_INO */ | |
27294 | + }; | |
27295 | + union au_rdu_ent_ul ent; | |
27296 | + __u16 verify[AufsCtlRduV_End]; | |
27297 | + | |
27298 | + /* input/output */ | |
27299 | + __u32 blk; | |
27300 | + | |
27301 | + /* output */ | |
27302 | + union au_rdu_ent_ul tail; | |
27303 | + /* number of entries which were added in a single call */ | |
27304 | + __u64 rent; | |
27305 | + __u8 full; | |
27306 | + __u8 shwh; | |
27307 | + | |
27308 | + struct au_rdu_cookie cookie; | |
27309 | +} __aligned(8); | |
27310 | + | |
1facf9fc | 27311 | +#define AuCtlType 'A' |
953406b4 AM |
27312 | +#define AUFS_CTL_PLINK_MAINT _IO(AuCtlType, AuCtl_PLINK_MAINT) |
27313 | +#define AUFS_CTL_PLINK_CLEAN _IO(AuCtlType, AuCtl_PLINK_CLEAN) | |
1308ab2a | 27314 | +#define AUFS_CTL_RDU _IOWR(AuCtlType, AuCtl_RDU, struct aufs_rdu) |
27315 | +#define AUFS_CTL_RDU_INO _IOWR(AuCtlType, AuCtl_RDU_INO, struct aufs_rdu) | |
4a4d8108 | 27316 | +#define AUFS_CTL_WBR_FD _IO(AuCtlType, AuCtl_WBR_FD) |
1facf9fc | 27317 | + |
27318 | +#endif /* __AUFS_TYPE_H__ */ | |
953406b4 | 27319 |