+
+For more information, see <http://unionfs.filesystems.org/>.
diff --git a/MAINTAINERS b/MAINTAINERS
-index f0358cd..7ae0669 100644
+index 9a648eb..81b24a8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
-@@ -6375,6 +6375,14 @@ F: Documentation/cdrom/
+@@ -6765,6 +6765,14 @@ F: Documentation/cdrom/
F: drivers/cdrom/cdrom.c
F: include/linux/cdrom.h
M: Artem Bityutskiy <dedekind1@gmail.com>
W: http://www.linux-mtd.infradead.org/
diff --git a/fs/Kconfig b/fs/Kconfig
-index 19891aa..ac8a074 100644
+index d621f02..c12677d 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
-@@ -187,6 +187,7 @@ if MISC_FILESYSTEMS
+@@ -194,6 +194,7 @@ if MISC_FILESYSTEMS
source "fs/adfs/Kconfig"
source "fs/affs/Kconfig"
source "fs/ecryptfs/Kconfig"
source "fs/hfsplus/Kconfig"
source "fs/befs/Kconfig"
diff --git a/fs/Makefile b/fs/Makefile
-index fb68c2b..8ca9290 100644
+index 93804d4..3ff10bb 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -83,6 +83,7 @@ obj-$(CONFIG_ISO9660_FS) += isofs/
obj-$(CONFIG_NFS_FS) += nfs/
obj-$(CONFIG_EXPORTFS) += exportfs/
diff --git a/fs/namei.c b/fs/namei.c
-index 0223c41..5d0261e 100644
+index 208c6aa..050eded 100644
--- a/fs/namei.c
+++ b/fs/namei.c
-@@ -484,6 +484,7 @@ void release_open_intent(struct nameidata *nd)
+@@ -491,6 +491,7 @@ void release_open_intent(struct nameidata *nd)
fput(file);
}
}
static inline int d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
-@@ -1740,6 +1741,42 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
+@@ -1804,6 +1805,42 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
return __lookup_hash(&this, base, NULL);
}
+ return __lookup_hash(&this, base, nd);
+}
+
- int user_path_at(int dfd, const char __user *name, unsigned flags,
- struct path *path)
+ int user_path_at_empty(int dfd, const char __user *name, unsigned flags,
+ struct path *path, int *empty)
{
-@@ -3339,6 +3376,7 @@ EXPORT_SYMBOL(get_write_access); /* binfmt_aout */
+@@ -3384,6 +3421,7 @@ EXPORT_SYMBOL(get_write_access); /* binfmt_aout */
EXPORT_SYMBOL(getname);
EXPORT_SYMBOL(lock_rename);
EXPORT_SYMBOL(lookup_one_len);
EXPORT_SYMBOL(page_put_link);
EXPORT_SYMBOL(page_readlink);
diff --git a/fs/splice.c b/fs/splice.c
-index aa866d3..421ab86 100644
+index 1ec0493..3215728 100644
--- a/fs/splice.c
+++ b/fs/splice.c
-@@ -1085,8 +1085,8 @@ EXPORT_SYMBOL(generic_splice_sendpage);
+@@ -1084,8 +1084,8 @@ EXPORT_SYMBOL(generic_splice_sendpage);
/*
* Attempt to initiate a splice from pipe to file.
*/
{
ssize_t (*splice_write)(struct pipe_inode_info *, struct file *,
loff_t *, size_t, unsigned int);
-@@ -1109,13 +1109,14 @@ static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
+@@ -1108,13 +1108,14 @@ static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
return splice_write(pipe, out, ppos, len, flags);
}
{
ssize_t (*splice_read)(struct file *, loff_t *,
struct pipe_inode_info *, size_t, unsigned int);
-@@ -1135,6 +1136,7 @@ static long do_splice_to(struct file *in, loff_t *ppos,
+@@ -1134,6 +1135,7 @@ static long do_splice_to(struct file *in, loff_t *ppos,
return splice_read(in, ppos, pipe, len, flags);
}
/**
* splice_direct_to_actor - splices data directly between two non-pipes
-@@ -1204,7 +1206,7 @@ ssize_t splice_direct_to_actor(struct file *in, struct splice_desc *sd,
+@@ -1203,7 +1205,7 @@ ssize_t splice_direct_to_actor(struct file *in, struct splice_desc *sd,
size_t read_len;
loff_t pos = sd->pos, prev_pos = pos;
if (unlikely(ret <= 0))
goto out_release;
-@@ -1263,8 +1265,8 @@ static int direct_splice_actor(struct pipe_inode_info *pipe,
+@@ -1262,8 +1264,8 @@ static int direct_splice_actor(struct pipe_inode_info *pipe,
{
struct file *file = sd->u.file;
}
/**
-@@ -1349,7 +1351,7 @@ static long do_splice(struct file *in, loff_t __user *off_in,
+@@ -1348,7 +1350,7 @@ static long do_splice(struct file *in, loff_t __user *off_in,
} else
off = &out->f_pos;
if (off_out && copy_to_user(off_out, off, sizeof(loff_t)))
ret = -EFAULT;
-@@ -1369,7 +1371,7 @@ static long do_splice(struct file *in, loff_t __user *off_in,
+@@ -1368,7 +1370,7 @@ static long do_splice(struct file *in, loff_t __user *off_in,
} else
off = &in->f_pos;
if (off_in && copy_to_user(off_in, off, sizeof(loff_t)))
ret = -EFAULT;
-diff --git a/fs/stack.c b/fs/stack.c
-index 4a6f7f4..7eeef12 100644
---- a/fs/stack.c
-+++ b/fs/stack.c
-@@ -1,8 +1,20 @@
-+/*
-+ * Copyright (c) 2006-2009 Erez Zadok
-+ * Copyright (c) 2006-2007 Josef 'Jeff' Sipek
-+ * Copyright (c) 2006-2009 Stony Brook University
-+ * Copyright (c) 2006-2009 The Research Foundation of SUNY
-+ *
-+ * This program is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License version 2 as
-+ * published by the Free Software Foundation.
-+ */
-+
- #include <linux/module.h>
- #include <linux/fs.h>
- #include <linux/fs_stack.h>
-
--/* does _NOT_ require i_mutex to be held.
-+/*
-+ * does _NOT_ require i_mutex to be held.
- *
- * This function cannot be inlined since i_size_{read,write} is rather
- * heavy-weight on 32-bit systems
diff --git a/fs/unionfs/Kconfig b/fs/unionfs/Kconfig
new file mode 100644
index 0000000..f3c1ac4
+ If you say Y here, you can turn on debugging output from Unionfs.
diff --git a/fs/unionfs/Makefile b/fs/unionfs/Makefile
new file mode 100644
-index 0000000..0ece303
+index 0000000..60b6060
--- /dev/null
+++ b/fs/unionfs/Makefile
@@ -0,0 +1,17 @@
-+UNIONFS_VERSION="2.5.9.2 (for 3.0.0-rc4)"
++UNIONFS_VERSION="2.5.11 (for 3.3.0-rc3)"
+
+EXTRA_CFLAGS += -DUNIONFS_VERSION=\"$(UNIONFS_VERSION)\"
+
+endif
diff --git a/fs/unionfs/commonfops.c b/fs/unionfs/commonfops.c
new file mode 100644
-index 0000000..0a271f4
+index 0000000..71cacfe
--- /dev/null
+++ b/fs/unionfs/commonfops.c
-@@ -0,0 +1,896 @@
+@@ -0,0 +1,901 @@
+/*
+ * Copyright (c) 2003-2011 Erez Zadok
+ * Copyright (c) 2003-2006 Charles P. Wright
+ * someone has copied up this file from underneath us, we also need
+ * to refresh things.
+ */
-+ if ((d_deleted(dentry) && dbstart(dentry) >= fbstart(file)) ||
++ if (d_deleted(dentry) ||
+ (sbgen <= fgen &&
+ dbstart(dentry) == fbstart(file) &&
+ unionfs_lower_file(file)))
+}
+
+/* unionfs_open helper function: open a directory */
-+static int __open_dir(struct inode *inode, struct file *file)
++static int __open_dir(struct inode *inode, struct file *file,
++ struct dentry *parent)
+{
+ struct dentry *lower_dentry;
+ struct file *lower_file;
+ int bindex, bstart, bend;
-+ struct vfsmount *mnt;
++ struct vfsmount *lower_mnt;
++ struct dentry *dentry = file->f_path.dentry;
+
-+ bstart = fbstart(file) = dbstart(file->f_path.dentry);
-+ bend = fbend(file) = dbend(file->f_path.dentry);
++ bstart = fbstart(file) = dbstart(dentry);
++ bend = fbend(file) = dbend(dentry);
+
+ for (bindex = bstart; bindex <= bend; bindex++) {
+ lower_dentry =
-+ unionfs_lower_dentry_idx(file->f_path.dentry, bindex);
++ unionfs_lower_dentry_idx(dentry, bindex);
+ if (!lower_dentry)
+ continue;
+
+ dget(lower_dentry);
-+ unionfs_mntget(file->f_path.dentry, bindex);
-+ mnt = unionfs_lower_mnt_idx(file->f_path.dentry, bindex);
-+ lower_file = dentry_open(lower_dentry, mnt, file->f_flags,
++ lower_mnt = unionfs_mntget(dentry, bindex);
++ if (!lower_mnt)
++ lower_mnt = unionfs_mntget(parent, bindex);
++ lower_file = dentry_open(lower_dentry, lower_mnt, file->f_flags,
+ current_cred());
+ if (IS_ERR(lower_file))
+ return PTR_ERR(lower_file);
+
+ unionfs_set_lower_file_idx(file, bindex, lower_file);
++ if (!unionfs_lower_mnt_idx(dentry, bindex))
++ unionfs_set_lower_mnt_idx(dentry, bindex, lower_mnt);
+
+ /*
+ * The branchget goes after the open, because otherwise
+ struct file *lower_file;
+ int lower_flags;
+ int bindex, bstart, bend;
++ struct dentry *dentry = file->f_path.dentry;
++ struct vfsmount *lower_mnt;
+
-+ lower_dentry = unionfs_lower_dentry(file->f_path.dentry);
++ lower_dentry = unionfs_lower_dentry(dentry);
+ lower_flags = file->f_flags;
+
-+ bstart = fbstart(file) = dbstart(file->f_path.dentry);
-+ bend = fbend(file) = dbend(file->f_path.dentry);
++ bstart = fbstart(file) = dbstart(dentry);
++ bend = fbend(file) = dbend(dentry);
+
+ /*
+ * check for the permission for lower file. If the error is
+ * COPYUP_ERR, copyup the file.
+ */
-+ if (lower_dentry->d_inode && is_robranch(file->f_path.dentry)) {
++ if (lower_dentry->d_inode && is_robranch(dentry)) {
+ /*
+ * if the open will change the file, copy it up otherwise
+ * defer it.
+ * dentry_open will decrement mnt refcnt if err.
+ * otherwise fput() will do an mntput() for us upon file close.
+ */
-+ unionfs_mntget(file->f_path.dentry, bstart);
-+ lower_file =
-+ dentry_open(lower_dentry,
-+ unionfs_lower_mnt_idx(file->f_path.dentry, bstart),
-+ lower_flags, current_cred());
++ lower_mnt = unionfs_mntget(dentry, bstart);
++ lower_file = dentry_open(lower_dentry, lower_mnt, lower_flags,
++ current_cred());
+ if (IS_ERR(lower_file))
+ return PTR_ERR(lower_file);
+
+ * these lower file structs
+ */
+ if (S_ISDIR(inode->i_mode))
-+ err = __open_dir(inode, file); /* open a dir */
++ err = __open_dir(inode, file, parent); /* open a dir */
+ else
+ err = __open_file(inode, file, parent); /* open a file */
+
+}
diff --git a/fs/unionfs/copyup.c b/fs/unionfs/copyup.c
new file mode 100644
-index 0000000..37c2654
+index 0000000..078ca27
--- /dev/null
+++ b/fs/unionfs/copyup.c
-@@ -0,0 +1,896 @@
+@@ -0,0 +1,899 @@
+/*
+ * Copyright (c) 2003-2011 Erez Zadok
+ * Copyright (c) 2003-2006 Charles P. Wright
+
+ kfree(buf);
+
++#if 0
++ /* XXX: code no longer needed? */
+ if (!err)
+ err = output_file->f_op->fsync(output_file, 0);
++#endif
+
+ if (err)
+ goto out_close_out;
+}
diff --git a/fs/unionfs/debug.c b/fs/unionfs/debug.c
new file mode 100644
-index 0000000..6092e69
+index 0000000..21ce90c
--- /dev/null
+++ b/fs/unionfs/debug.c
-@@ -0,0 +1,548 @@
+@@ -0,0 +1,551 @@
+/*
+ * Copyright (c) 2003-2011 Erez Zadok
+ * Copyright (c) 2005-2007 Josef 'Jeff' Sipek
+ */
+
+#include "union.h"
++#include "../mount.h"
+
+/*
+ * Helper debugging functions for maintainers (and for users to report back
+ pr_debug(" CF0: file/dentry=%p:%p fstart/end=%d:%d\n",
+ file, dentry, fstart, fend);
+ }
-+ if (unlikely(fstart != dstart)) {
++ /* d_deleted dentries can be ignored for this test */
++ if (unlikely(fstart != dstart) && !d_deleted(dentry)) {
+ PRINT_CALLER(fname, fxn, line);
+ pr_debug(" CF1: file/dentry=%p:%p fstart=%d dstart=%d\n",
+ file, dentry, fstart, dstart);
+ }
-+ if (unlikely(fend != dend)) {
++ if (unlikely(fend != dend) && !d_deleted(dentry)) {
+ PRINT_CALLER(fname, fxn, line);
+ pr_debug(" CF2: file/dentry=%p:%p fend=%d dend=%d\n",
+ file, dentry, fend, dend);
+
+static unsigned int __mnt_get_count(struct vfsmount *mnt)
+{
++ struct mount *m = real_mount(mnt);
+#ifdef CONFIG_SMP
+ unsigned int count = 0;
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
-+ count += per_cpu_ptr(mnt->mnt_pcp, cpu)->mnt_count;
++ count += per_cpu_ptr(m->mnt_pcp, cpu)->mnt_count;
+ }
+
+ return count;
+#else
-+ return mnt->mnt_count;
++ return m->mnt_count;
+#endif
+}
+
+}
diff --git a/fs/unionfs/dentry.c b/fs/unionfs/dentry.c
new file mode 100644
-index 0000000..c0205a4
+index 0000000..1628dad
--- /dev/null
+++ b/fs/unionfs/dentry.c
-@@ -0,0 +1,406 @@
+@@ -0,0 +1,409 @@
+/*
+ * Copyright (c) 2003-2011 Erez Zadok
+ * Copyright (c) 2003-2006 Charles P. Wright
+}
+
+static int unionfs_d_revalidate(struct dentry *dentry,
-+ struct nameidata *nd_unused)
++ struct nameidata *nd)
+{
+ bool valid = true;
+ int err = 1; /* 1 means valid for the VFS */
+ struct dentry *parent;
+
++ if (nd && nd->flags & LOOKUP_RCU)
++ return -ECHILD;
++
+ unionfs_read_lock(dentry->d_sb, UNIONFS_SMUTEX_CHILD);
+ parent = unionfs_lock_parent(dentry, UNIONFS_DMUTEX_PARENT);
+ unionfs_lock_dentry(dentry, UNIONFS_DMUTEX_CHILD);
+#endif /* not _FANOUT_H */
diff --git a/fs/unionfs/file.c b/fs/unionfs/file.c
new file mode 100644
-index 0000000..416c52f
+index 0000000..f583c8f
--- /dev/null
+++ b/fs/unionfs/file.c
-@@ -0,0 +1,382 @@
+@@ -0,0 +1,386 @@
+/*
+ * Copyright (c) 2003-2011 Erez Zadok
+ * Copyright (c) 2003-2006 Charles P. Wright
+ return err;
+}
+
-+int unionfs_fsync(struct file *file, int datasync)
++int unionfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
+{
+ int bindex, bstart, bend;
+ struct file *lower_file;
+ struct inode *lower_inode, *inode;
+ int err = -EINVAL;
+
++ lockdep_off();
+ unionfs_read_lock(dentry->d_sb, UNIONFS_SMUTEX_PARENT);
+ parent = unionfs_lock_parent(dentry, UNIONFS_DMUTEX_PARENT);
+ unionfs_lock_dentry(dentry, UNIONFS_DMUTEX_CHILD);
+ goto out;
+ unionfs_check_file(file);
+
++ err = generic_file_fsync(file, start, end, datasync);
++ if (err)
++ goto out;
++
+ bstart = fbstart(file);
+ bend = fbend(file);
+ if (bstart < 0 || bend < 0)
+ continue;
+ lower_file = unionfs_lower_file_idx(file, bindex);
+ lower_dentry = unionfs_lower_dentry_idx(dentry, bindex);
-+ mutex_lock(&lower_inode->i_mutex);
-+ err = lower_inode->i_fop->fsync(lower_file, datasync);
++ err = vfs_fsync_range(lower_file, start, end, datasync);
+ if (!err && bindex == bstart)
+ fsstack_copy_attr_times(inode, lower_inode);
-+ mutex_unlock(&lower_inode->i_mutex);
+ if (err)
+ goto out;
+ }
+ unionfs_unlock_dentry(dentry);
+ unionfs_unlock_parent(dentry, parent);
+ unionfs_read_unlock(dentry->d_sb);
++ lockdep_on();
+ return err;
+}
+
+};
diff --git a/fs/unionfs/inode.c b/fs/unionfs/inode.c
new file mode 100644
-index 0000000..b207c13
+index 0000000..dd522c2
--- /dev/null
+++ b/fs/unionfs/inode.c
-@@ -0,0 +1,1099 @@
+@@ -0,0 +1,1085 @@
+/*
+ * Copyright (c) 2003-2011 Erez Zadok
+ * Copyright (c) 2003-2006 Charles P. Wright
+}
+
+static int unionfs_create(struct inode *dir, struct dentry *dentry,
-+ int mode, struct nameidata *nd_unused)
++ umode_t mode, struct nameidata *nd_unused)
+{
+ int err = 0;
+ struct dentry *lower_dentry = NULL;
+ fsstack_copy_inode_size(dir,
+ lower_parent_dentry->d_inode);
+ /* update no. of links on parent directory */
-+ dir->i_nlink = unionfs_get_nlinks(dir);
++ set_nlink(dir, unionfs_get_nlinks(dir));
+ }
+ }
+
+ lower_dir_dentry = dget_parent(lower_new_dentry);
+ fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
+ dput(lower_dir_dentry);
-+ dir->i_nlink = unionfs_get_nlinks(dir);
++ set_nlink(dir, unionfs_get_nlinks(dir));
+ err = 0;
+ }
+ if (err)
+ fsstack_copy_inode_size(dir, lower_new_dentry->d_parent->d_inode);
+
+ /* propagate number of hard-links */
-+ old_dentry->d_inode->i_nlink = unionfs_get_nlinks(old_dentry->d_inode);
++ set_nlink(old_dentry->d_inode,
++ unionfs_get_nlinks(old_dentry->d_inode));
+ /* new dentry's ctime may have changed due to hard-link counts */
+ unionfs_copy_attr_times(new_dentry->d_inode);
+
+ fsstack_copy_inode_size(dir,
+ lower_parent_dentry->d_inode);
+ /* update no. of links on parent directory */
-+ dir->i_nlink = unionfs_get_nlinks(dir);
++ set_nlink(dir, unionfs_get_nlinks(dir));
+ }
+ }
+
+ return err;
+}
+
-+static int unionfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
++static int unionfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+ int err = 0;
+ struct dentry *lower_dentry = NULL;
+ lower_parent_dentry->d_inode);
+
+ /* update number of links on parent directory */
-+ dir->i_nlink = unionfs_get_nlinks(dir);
++ set_nlink(dir, unionfs_get_nlinks(dir));
+ }
+
+ err = make_dir_opaque(dentry, dbstart(dentry));
+ return err;
+}
+
-+static int unionfs_mknod(struct inode *dir, struct dentry *dentry, int mode,
++static int unionfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
+ dev_t dev)
+{
+ int err = 0;
+ fsstack_copy_inode_size(dir,
+ lower_parent_dentry->d_inode);
+ /* update no. of links on parent directory */
-+ dir->i_nlink = unionfs_get_nlinks(dir);
++ set_nlink(dir, unionfs_get_nlinks(dir));
+ }
+ }
+
+ * This is a variant of fs/namei.c:permission() or inode_permission() which
+ * skips over EROFS tests (because we perform copyup on EROFS).
+ */
-+static int __inode_permission(struct inode *inode, int mask, unsigned int flags)
++static int __inode_permission(struct inode *inode, int mask)
+{
+ int retval;
+
+
+ /* Ordinary permission routines do not understand MAY_APPEND. */
+ if (inode->i_op && inode->i_op->permission) {
-+ retval = inode->i_op->permission(inode, mask, flags);
++ retval = inode->i_op->permission(inode, mask);
+ if (!retval) {
+ /*
+ * Exec permission on a regular file is denied if none
+ return -EACCES;
+ }
+ } else {
-+ retval = generic_permission(inode, mask, flags, NULL);
++ retval = generic_permission(inode, mask);
+ }
+ if (retval)
+ return retval;
+ * unionfs_permission, or anything it calls, will use stale branch
+ * information.
+ */
-+static int unionfs_permission(struct inode *inode, int mask, unsigned int flags)
++static int unionfs_permission(struct inode *inode, int mask)
+{
+ struct inode *lower_inode = NULL;
+ int err = 0;
+ int is_file;
+ const int write_mask = (mask & MAY_WRITE) && !(mask & MAY_READ);
+ struct inode *inode_grabbed;
-+ struct dentry *dentry;
-+
-+ if (flags & IPERM_FLAG_RCU) {
-+ err = -ECHILD;
-+ goto out_nograb;
-+ }
-+
-+ dentry = d_find_alias(inode);
-+ if (dentry)
-+ unionfs_lock_dentry(dentry, UNIONFS_DMUTEX_CHILD);
+
+ inode_grabbed = igrab(inode);
+ is_file = !S_ISDIR(inode->i_mode);
+ * copyup taking place later on. However, if user never had
+ * access to the file, then no copyup could ever take place.
+ */
-+ err = __inode_permission(lower_inode, mask, flags);
++ err = __inode_permission(lower_inode, mask);
+ if (err && err != -EACCES && err != EPERM && bindex > 0) {
+ umode_t mode = lower_inode->i_mode;
+ if ((is_robranch_super(inode->i_sb, bindex) ||
+ if (err && err == -EACCES &&
+ is_robranch_super(inode->i_sb, bindex) &&
+ lower_inode->i_sb->s_magic == NFS_SUPER_MAGIC)
-+ err = generic_permission(lower_inode, mask, flags, NULL);
++ err = generic_permission(lower_inode, mask);
+
+ /*
+ * The permissions are an intersection of the overall directory
+
+out:
+ unionfs_check_inode(inode);
-+ if (dentry) {
-+ unionfs_unlock_dentry(dentry);
-+ dput(dentry);
-+ }
+ iput(inode_grabbed);
-+out_nograb:
+ return err;
+}
+
+};
diff --git a/fs/unionfs/lookup.c b/fs/unionfs/lookup.c
new file mode 100644
-index 0000000..3cbde56
+index 0000000..041d674
--- /dev/null
+++ b/fs/unionfs/lookup.c
-@@ -0,0 +1,569 @@
+@@ -0,0 +1,570 @@
+/*
+ * Copyright (c) 2003-2011 Erez Zadok
+ * Copyright (c) 2003-2006 Charles P. Wright
+ const char *name, struct vfsmount **new_mnt)
+{
+ struct dentry *dentry = NULL;
-+ struct nameidata lower_nd;
++ struct path lower_path = {NULL, NULL};
+ int err;
+
+ /* we use flags=0 to get basic lookup */
-+ err = vfs_path_lookup(base, mnt, name, 0, &lower_nd);
++ err = vfs_path_lookup(base, mnt, name, 0, &lower_path);
+
+ switch (err) {
+ case 0: /* no error */
-+ dentry = lower_nd.path.dentry;
++ dentry = lower_path.dentry;
+ if (new_mnt)
-+ *new_mnt = lower_nd.path.mnt; /* rc already inc'ed */
++ *new_mnt = lower_path.mnt; /* rc already inc'ed */
+ break;
+ case -ENOENT:
+ /*
+ */
+ dentry = lookup_lck_len(name, base, strlen(name));
+ if (new_mnt)
-+ *new_mnt = mntget(lower_nd.path.mnt);
++ *new_mnt = mntget(lower_path.mnt);
+ break;
+ default: /* all other real errors */
+ dentry = ERR_PTR(err);
+ verify_locked(parent);
+
+ /* must initialize dentry operations */
-+ dentry->d_op = &unionfs_dops;
++ if (lookupmode == INTERPOSE_LOOKUP)
++ d_set_d_op(dentry, &unionfs_dops);
+
+ /* We never partial lookup the root directory. */
+ if (IS_ROOT(dentry))
+}
diff --git a/fs/unionfs/main.c b/fs/unionfs/main.c
new file mode 100644
-index 0000000..fa52f61
+index 0000000..ee78f1d
--- /dev/null
+++ b/fs/unionfs/main.c
-@@ -0,0 +1,763 @@
+@@ -0,0 +1,752 @@
+/*
+ * Copyright (c) 2003-2011 Erez Zadok
+ * Copyright (c) 2003-2006 Charles P. Wright
+ * properly. Finally we must return this new
+ * dentry.
+ */
-+ spliced->d_op = &unionfs_dops;
++ d_set_d_op(spliced, &unionfs_dops);
+ spliced->d_fsdata = dentry->d_fsdata;
+ dentry->d_fsdata = NULL;
+ dentry = spliced;
+}
+
+/*
-+ * our custom d_alloc_root work-alike
-+ *
-+ * we can't use d_alloc_root if we want to use our own interpose function
-+ * unchanged, so we simply call our own "fake" d_alloc_root
-+ */
-+static struct dentry *unionfs_d_alloc_root(struct super_block *sb)
-+{
-+ struct dentry *ret = NULL;
-+
-+ if (sb) {
-+ static const struct qstr name = {
-+ .name = "/",
-+ .len = 1
-+ };
-+
-+ ret = d_alloc(NULL, &name);
-+ if (likely(ret)) {
-+ ret->d_op = &unionfs_dops;
-+ ret->d_sb = sb;
-+ ret->d_parent = ret;
-+ }
-+ }
-+ return ret;
-+}
-+
-+/*
+ * There is no need to lock the unionfs_super_info's rwsem as there is no
+ * way anyone can have a reference to the superblock at this point in time.
+ */
+ int err = 0;
+ struct unionfs_dentry_info *lower_root_info = NULL;
+ int bindex, bstart, bend;
++ struct inode *inode = NULL;
+
+ if (!raw_data) {
+ printk(KERN_ERR
+
+ sb->s_op = &unionfs_sops;
+
-+ /* See comment next to the definition of unionfs_d_alloc_root */
-+ sb->s_root = unionfs_d_alloc_root(sb);
++ /* get a new inode and allocate our root dentry */
++ inode = unionfs_iget(sb, iunique(sb, UNIONFS_ROOT_INO));
++ if (IS_ERR(inode)) {
++ err = PTR_ERR(inode);
++ goto out_dput;
++ }
++ sb->s_root = d_make_root(inode);
+ if (unlikely(!sb->s_root)) {
+ err = -ENOMEM;
+ goto out_dput;
+ }
++ d_set_d_op(sb->s_root, &unionfs_dops);
+
+ /* link the upper and lower dentries */
+ sb->s_root->d_fsdata = NULL;
+ if (unlikely(err))
+ goto out_freedpd;
+
++ /* if get here: cannot have error */
++
+ /* Set the lower dentries for s_root */
+ for (bindex = bstart; bindex <= bend; bindex++) {
+ struct dentry *d;
+ /* Set the generation number to one, since this is for the mount. */
+ atomic_set(&UNIONFS_D(sb->s_root)->generation, 1);
+
++ if (atomic_read(&inode->i_count) <= 1)
++ unionfs_fill_inode(sb->s_root, inode);
++
+ /*
-+ * Call interpose to create the upper level inode. Only
-+ * INTERPOSE_LOOKUP can return a value other than 0 on err.
++ * No need to call interpose because we already have a positive
++ * dentry, which was instantiated by d_alloc_root. Just need to
++ * d_rehash it.
+ */
-+ err = PTR_ERR(unionfs_interpose(sb->s_root, sb, 0));
++ d_rehash(sb->s_root);
++
+ unionfs_unlock_dentry(sb->s_root);
-+ if (!err)
-+ goto out;
-+ /* else fall through */
++ goto out; /* all is well */
+
+out_freedpd:
+ if (UNIONFS_D(sb->s_root)) {
+ }
+ dput(sb->s_root);
+
++out_iput:
++ iput(inode);
++
+out_dput:
+ if (lower_root_info && !IS_ERR(lower_root_info)) {
+ for (bindex = lower_root_info->bstart;
+ struct dentry *dentry;
+
+ dentry = mount_nodev(fs_type, flags, raw_data, unionfs_read_super);
-+ if (!PTR_ERR(dentry))
++ if (!IS_ERR(dentry))
+ UNIONFS_SB(dentry->d_sb)->dev_name =
+ kstrdup(dev_name, GFP_KERNEL);
+ return dentry;
+}
diff --git a/fs/unionfs/rename.c b/fs/unionfs/rename.c
new file mode 100644
-index 0000000..c8ab910
+index 0000000..ce85b84
--- /dev/null
+++ b/fs/unionfs/rename.c
@@ -0,0 +1,522 @@
+ fsstack_copy_attr_times(new_parent->d_inode,
+ unlink_dir_dentry->d_inode);
+ /* propagate number of hard-links */
-+ new_parent->d_inode->i_nlink =
-+ unionfs_get_nlinks(new_parent->d_inode);
++ set_nlink(new_parent->d_inode,
++ unionfs_get_nlinks(new_parent->d_inode));
+
+ unlock_dir(unlink_dir_dentry);
+ if (!err) {
+#endif /* not _SIOQ_H */
diff --git a/fs/unionfs/subr.c b/fs/unionfs/subr.c
new file mode 100644
-index 0000000..bdca2f7
+index 0000000..e7fc5a5
--- /dev/null
+++ b/fs/unionfs/subr.c
@@ -0,0 +1,95 @@
+ * Update the nlinks AFTER updating the above fields, because the
+ * get_links callback may depend on them.
+ */
-+ dest->i_nlink = unionfs_get_nlinks(dest);
++ set_nlink(dest, unionfs_get_nlinks(dest));
+}
diff --git a/fs/unionfs/super.c b/fs/unionfs/super.c
new file mode 100644
-index 0000000..c3ac814
+index 0000000..b99f14d
--- /dev/null
+++ b/fs/unionfs/super.c
@@ -0,0 +1,1030 @@
+ unionfs_read_unlock(sb);
+}
+
-+static int unionfs_show_options(struct seq_file *m, struct vfsmount *mnt)
++static int unionfs_show_options(struct seq_file *m, struct dentry *root)
+{
-+ struct super_block *sb = mnt->mnt_sb;
++ struct super_block *sb = root->d_sb;
+ int ret = 0;
+ char *tmp_page;
+ char *path;
+};
diff --git a/fs/unionfs/union.h b/fs/unionfs/union.h
new file mode 100644
-index 0000000..1821705
+index 0000000..8e7fcfb
--- /dev/null
+++ b/fs/unionfs/union.h
-@@ -0,0 +1,679 @@
+@@ -0,0 +1,681 @@
+/*
+ * Copyright (c) 2003-2011 Erez Zadok
+ * Copyright (c) 2003-2006 Charles P. Wright
+#include <linux/splice.h>
+#include <linux/sched.h>
+
-+#include <asm/system.h>
++
+
+#include <linux/union_fs.h>
+
+extern int unionfs_flush(struct file *file, fl_owner_t id);
+extern long unionfs_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg);
-+extern int unionfs_fsync(struct file *file, int datasync);
++extern int unionfs_fsync(struct file *file, loff_t start, loff_t end,
++ int datasync);
+extern int unionfs_fasync(int fd, struct file *file, int flag);
+
+/* Inode operations */
+#define show_inode_times(i) do { } while (0)
+#define show_dinode_times(d) do { } while (0)
+#define show_inode_counts(i) do { } while (0)
++#define UDBG do { } while (0)
+
+#endif /* not CONFIG_UNION_FS_DEBUG */
+
+#endif /* not _UNION_H_ */
diff --git a/fs/unionfs/unlink.c b/fs/unionfs/unlink.c
new file mode 100644
-index 0000000..bf447bb
+index 0000000..25943a5
--- /dev/null
+++ b/fs/unionfs/unlink.c
@@ -0,0 +1,278 @@
+
+ fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
+ /* propagate number of hard-links */
-+ dentry->d_inode->i_nlink = unionfs_get_nlinks(dentry->d_inode);
++ set_nlink(dentry->d_inode, unionfs_get_nlinks(dentry->d_inode));
+
+out:
+ if (lower_dir_dentry)
*/
diff --git a/include/linux/magic.h b/include/linux/magic.h
-index 1e5df2a..01ee54d 100644
+index 2d4beab..39f5798 100644
--- a/include/linux/magic.h
+++ b/include/linux/magic.h
@@ -50,6 +50,8 @@
#define USBDEVICE_SUPER_MAGIC 0x9fa2
#define CGROUP_SUPER_MAGIC 0x27e0eb
diff --git a/include/linux/namei.h b/include/linux/namei.h
-index eba45ea..8e19e9c 100644
+index ffc0213..99802c3 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
-@@ -81,8 +81,11 @@ extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
+@@ -84,8 +84,11 @@ extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
int (*open)(struct inode *, struct file *));
extern int follow_down_one(struct path *);
extern int follow_down(struct path *);
diff --git a/include/linux/splice.h b/include/linux/splice.h
-index 997c3b4..54f5501 100644
+index 26e5b61..28213e6 100644
--- a/include/linux/splice.h
+++ b/include/linux/splice.h
@@ -81,6 +81,11 @@ extern ssize_t splice_to_pipe(struct pipe_inode_info *,
+#endif /* _LINUX_UNIONFS_H */
+
diff --git a/security/security.c b/security/security.c
-index 4ba6d4c..093d8b4 100644
+index d754249..f7e8373 100644
--- a/security/security.c
+++ b/security/security.c
-@@ -520,6 +520,7 @@ int security_inode_permission(struct inode *inode, int mask)
+@@ -538,6 +538,7 @@ int security_inode_permission(struct inode *inode, int mask)
return 0;
- return security_ops->inode_permission(inode, mask, 0);
+ return security_ops->inode_permission(inode, mask);
}
+EXPORT_SYMBOL(security_inode_permission);
- int security_inode_exec_permission(struct inode *inode, unsigned int flags)
+ int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
{
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