++#ifdef CONFIG_AUFS_DEBUG
++ /* reduce stack space */
++ union {
++ struct au_opt_add *add;
++ struct au_opt_del *del;
++ struct au_opt_mod *mod;
++ struct au_opt_xino *xino;
++ struct au_opt_xino_itrunc *xino_itrunc;
++ struct au_opt_wbr_create *create;
++ } u;
++ struct au_opt *opt;
++
++ opt = opts->opt;
++ while (opt->type != Opt_tail) {
++ switch (opt->type) {
++ case Opt_add:
++ u.add = &opt->add;
++ AuDbg("add {b%d, %s, 0x%x, %p}\n",
++ u.add->bindex, u.add->pathname, u.add->perm,
++ u.add->path.dentry);
++ break;
++ case Opt_del:
++ fallthrough;
++ case Opt_idel:
++ u.del = &opt->del;
++ AuDbg("del {%s, %p}\n",
++ u.del->pathname, u.del->h_path.dentry);
++ break;
++ case Opt_mod:
++ fallthrough;
++ case Opt_imod:
++ u.mod = &opt->mod;
++ AuDbg("mod {%s, 0x%x, %p}\n",
++ u.mod->path, u.mod->perm, u.mod->h_root);
++ break;
++ case Opt_append:
++ u.add = &opt->add;
++ AuDbg("append {b%d, %s, 0x%x, %p}\n",
++ u.add->bindex, u.add->pathname, u.add->perm,
++ u.add->path.dentry);
++ break;
++ case Opt_prepend:
++ u.add = &opt->add;
++ AuDbg("prepend {b%d, %s, 0x%x, %p}\n",
++ u.add->bindex, u.add->pathname, u.add->perm,
++ u.add->path.dentry);
++ break;
++
++ case Opt_dirwh:
++ AuDbg("dirwh %d\n", opt->dirwh);
++ break;
++ case Opt_rdcache:
++ AuDbg("rdcache %d\n", opt->rdcache);
++ break;
++ case Opt_rdblk:
++ AuDbg("rdblk %d\n", opt->rdblk);
++ break;
++ case Opt_rdhash:
++ AuDbg("rdhash %u\n", opt->rdhash);
++ break;
++
++ case Opt_xino:
++ u.xino = &opt->xino;
++ AuDbg("xino {%s %pD}\n", u.xino->path, u.xino->file);
++ break;
++
++#define au_fsctx_TF(name) \
++ case Opt_##name: \
++ if (opt->tf) \
++ AuLabel(name); \
++ else \
++ AuLabel(no##name); \
++ break;
++
++ /* simple true/false flag */
++ au_fsctx_TF(trunc_xino);
++ au_fsctx_TF(trunc_xib);
++ au_fsctx_TF(dirperm1);
++ au_fsctx_TF(plink);
++ au_fsctx_TF(shwh);
++ au_fsctx_TF(dio);
++ au_fsctx_TF(warn_perm);
++ au_fsctx_TF(verbose);
++ au_fsctx_TF(sum);
++ au_fsctx_TF(dirren);
++ au_fsctx_TF(acl);
++#undef au_fsctx_TF
++
++ case Opt_trunc_xino_path:
++ fallthrough;
++ case Opt_itrunc_xino:
++ u.xino_itrunc = &opt->xino_itrunc;
++ AuDbg("trunc_xino %d\n", u.xino_itrunc->bindex);
++ break;
++ case Opt_noxino:
++ AuLabel(noxino);
++ break;
++
++ case Opt_list_plink:
++ AuLabel(list_plink);
++ break;
++ case Opt_udba:
++ AuDbg("udba %d, %s\n",
++ opt->udba, au_optstr_udba(opt->udba));
++ break;
++ case Opt_diropq_a:
++ AuLabel(diropq_a);
++ break;
++ case Opt_diropq_w:
++ AuLabel(diropq_w);
++ break;
++ case Opt_wsum:
++ AuLabel(wsum);
++ break;
++ case Opt_wbr_create:
++ u.create = &opt->wbr_create;
++ AuDbg("create %d, %s\n", u.create->wbr_create,
++ au_optstr_wbr_create(u.create->wbr_create));
++ switch (u.create->wbr_create) {
++ case AuWbrCreate_MFSV:
++ fallthrough;
++ case AuWbrCreate_PMFSV:
++ AuDbg("%d sec\n", u.create->mfs_second);
++ break;
++ case AuWbrCreate_MFSRR:
++ fallthrough;
++ case AuWbrCreate_TDMFS:
++ AuDbg("%llu watermark\n",
++ u.create->mfsrr_watermark);
++ break;
++ case AuWbrCreate_MFSRRV:
++ fallthrough;
++ case AuWbrCreate_TDMFSV:
++ fallthrough;
++ case AuWbrCreate_PMFSRRV:
++ AuDbg("%llu watermark, %d sec\n",
++ u.create->mfsrr_watermark,
++ u.create->mfs_second);
++ break;
++ }
++ break;
++ case Opt_wbr_copyup:
++ AuDbg("copyup %d, %s\n", opt->wbr_copyup,
++ au_optstr_wbr_copyup(opt->wbr_copyup));
++ break;
++ case Opt_fhsm_sec:
++ AuDbg("fhsm_sec %u\n", opt->fhsm_second);
++ break;
++
++ default:
++ AuDbg("type %d\n", opt->type);
++ BUG();
++ }
++ opt++;
++ }
++#endif
++}
++
++/* ---------------------------------------------------------------------- */
++
++/*
++ * For conditionally compiled mount options.
++ * Instead of fsparam_flag_no(), use this macro to distinguish ignore_silent.
++ */
++#define au_ignore_flag(name, action) \
++ fsparam_flag(name, action), \
++ fsparam_flag("no" name, Opt_ignore_silent)
++
++const struct fs_parameter_spec aufs_fsctx_paramspec[] = {
++ fsparam_string("br", Opt_br),
++
++ /* "add=%d:%s" or "ins=%d:%s" */
++ fsparam_string("add", Opt_add),
++ fsparam_string("ins", Opt_add),
++ fsparam_path("append", Opt_append),
++ fsparam_path("prepend", Opt_prepend),
++
++ fsparam_path("del", Opt_del),
++ /* fsparam_s32("idel", Opt_idel), */
++ fsparam_path("mod", Opt_mod),
++ /* fsparam_string("imod", Opt_imod), */
++
++ fsparam_s32("dirwh", Opt_dirwh),
++
++ fsparam_path("xino", Opt_xino),
++ fsparam_flag("noxino", Opt_noxino),
++ fsparam_flag_no("trunc_xino", Opt_trunc_xino),
++ /* "trunc_xino_v=%d:%d" */
++ /* fsparam_string("trunc_xino_v", Opt_trunc_xino_v), */
++ fsparam_path("trunc_xino", Opt_trunc_xino_path),
++ fsparam_s32("itrunc_xino", Opt_itrunc_xino),
++ /* fsparam_path("zxino", Opt_zxino), */
++ fsparam_flag_no("trunc_xib", Opt_trunc_xib),
++
++#ifdef CONFIG_PROC_FS
++ fsparam_flag_no("plink", Opt_plink),
++#else
++ au_ignore_flag("plink", Opt_ignore),
++#endif
++
++#ifdef CONFIG_AUFS_DEBUG
++ fsparam_flag("list_plink", Opt_list_plink),
++#endif
++
++ fsparam_string("udba", Opt_udba),
++
++ fsparam_flag_no("dio", Opt_dio),
++
++#ifdef CONFIG_AUFS_DIRREN
++ fsparam_flag_no("dirren", Opt_dirren),
++#else
++ au_ignore_flag("dirren", Opt_ignore),
++#endif
++
++#ifdef CONFIG_AUFS_FHSM
++ fsparam_s32("fhsm_sec", Opt_fhsm_sec),
++#else
++ fsparam_s32("fhsm_sec", Opt_ignore),
++#endif
++
++ /* always | a | whiteouted | w */
++ fsparam_string("diropq", Opt_diropq),
++
++ fsparam_flag_no("warn_perm", Opt_warn_perm),
++
++#ifdef CONFIG_AUFS_SHWH
++ fsparam_flag_no("shwh", Opt_shwh),
++#else
++ au_ignore_flag("shwh", Opt_err),
++#endif
++
++ fsparam_flag_no("dirperm1", Opt_dirperm1),
++
++ fsparam_flag_no("verbose", Opt_verbose),
++ fsparam_flag("v", Opt_verbose),
++ fsparam_flag("quiet", Opt_noverbose),
++ fsparam_flag("q", Opt_noverbose),
++ /* user-space may handle this */
++ fsparam_flag("silent", Opt_noverbose),
++
++ fsparam_flag_no("sum", Opt_sum),
++ fsparam_flag("wsum", Opt_wsum),
++
++ fsparam_s32("rdcache", Opt_rdcache),
++ /* "def" or s32 */
++ fsparam_string("rdblk", Opt_rdblk),
++ /* "def" or s32 */
++ fsparam_string("rdhash", Opt_rdhash),
++
++ fsparam_string("create", Opt_wbr_create),
++ fsparam_string("create_policy", Opt_wbr_create),
++ fsparam_string("cpup", Opt_wbr_copyup),
++ fsparam_string("copyup", Opt_wbr_copyup),
++ fsparam_string("copyup_policy", Opt_wbr_copyup),
++
++ /* generic VFS flag */
++#ifdef CONFIG_FS_POSIX_ACL
++ fsparam_flag_no("acl", Opt_acl),
++#else
++ au_ignore_flag("acl", Opt_ignore),
++#endif
++
++ /* internal use for the scripts */
++ fsparam_string("si", Opt_ignore_silent),
++
++ /* obsoleted, keep them temporary */
++ fsparam_flag("nodlgt", Opt_ignore_silent),
++ fsparam_flag("clean_plink", Opt_ignore),
++ fsparam_string("dirs", Opt_br),
++ fsparam_u32("debug", Opt_ignore),
++ /* "whiteout" or "all" */
++ fsparam_string("delete", Opt_ignore),
++ fsparam_string("imap", Opt_ignore),
++
++ /* temporary workaround, due to old mount(8)? */
++ fsparam_flag("relatime", Opt_ignore_silent),
++
++ {}
++};
++
++static int au_fsctx_parse_do_add(struct fs_context *fc, struct au_opt *opt,
++ char *brspec, size_t speclen,
++ aufs_bindex_t bindex)
++{
++ int err;
++ char *p;
++
++ AuDbg("brspec %s\n", brspec);
++
++ err = -ENOMEM;
++ if (!speclen)
++ speclen = strlen(brspec);
++ /* will be freed by au_fsctx_free() */
++ p = kmemdup_nul(brspec, speclen, GFP_NOFS);
++ if (unlikely(!p)) {
++ errorfc(fc, "failed in %s", brspec);
++ goto out;
++ }
++ err = au_opt_add(opt, p, fc->sb_flags, bindex);
++
++out:
++ AuTraceErr(err);
++ return err;
++}
++
++static int au_fsctx_parse_br(struct fs_context *fc, char *brspec)
++{
++ int err;
++ char *p;
++ struct au_fsctx_opts *a = fc->fs_private;
++ struct au_opt *opt = a->opt;
++ aufs_bindex_t bindex = a->bindex;
++
++ AuDbg("brspec %s\n", brspec);
++
++ err = -EINVAL;
++ while ((p = strsep(&brspec, ":")) && *p) {
++ err = au_fsctx_parse_do_add(fc, opt, p, /*len*/0, bindex);
++ AuTraceErr(err);
++ if (unlikely(err))
++ break;
++ bindex++;
++ opt++;
++ if (unlikely(opt > a->opt_tail)) {
++ err = -E2BIG;
++ bindex--;
++ opt--;
++ break;
++ }
++ opt->type = Opt_tail;
++ a->skipped = 1;
++ }
++ a->bindex = bindex;
++ a->opt = opt;
++
++ AuTraceErr(err);
++ return err;
++}
++
++static int au_fsctx_parse_add(struct fs_context *fc, char *addspec)
++{
++ int err, n;
++ char *p;
++ struct au_fsctx_opts *a = fc->fs_private;
++ struct au_opt *opt = a->opt;
++
++ err = -EINVAL;
++ p = strchr(addspec, ':');
++ if (unlikely(!p)) {
++ errorfc(fc, "bad arg in %s", addspec);
++ goto out;
++ }
++ *p++ = '\0';
++ err = kstrtoint(addspec, 0, &n);
++ if (unlikely(err)) {
++ errorfc(fc, "bad integer in %s", addspec);
++ goto out;
++ }
++ AuDbg("n %d\n", n);
++ err = au_fsctx_parse_do_add(fc, opt, p, /*len*/0, n);
++
++out:
++ AuTraceErr(err);
++ return err;
++}
++
++static int au_fsctx_parse_del(struct fs_context *fc, struct au_opt_del *del,
++ struct fs_parameter *param)
++{
++ int err;
++
++ err = -ENOMEM;
++ /* will be freed by au_fsctx_free() */
++ del->pathname = kmemdup_nul(param->string, param->size, GFP_NOFS);
++ if (unlikely(!del->pathname))
++ goto out;
++ AuDbg("del %s\n", del->pathname);
++ err = vfsub_kern_path(del->pathname, AuOpt_LkupDirFlags, &del->h_path);
++ if (unlikely(err))
++ errorfc(fc, "lookup failed %s (%d)", del->pathname, err);
++
++out:
++ AuTraceErr(err);
++ return err;
++}
++
++#if 0 /* reserved for future use */
++static int au_fsctx_parse_idel(struct fs_context *fc, struct au_opt_del *del,
++ aufs_bindex_t bindex)
++{
++ int err;
++ struct super_block *sb;
++ struct dentry *root;
++ struct au_fsctx_opts *a = fc->fs_private;
++
++ sb = a->sb;
++ AuDebugOn(!sb);
++
++ err = -EINVAL;
++ root = sb->s_root;
++ aufs_read_lock(root, AuLock_FLUSH);
++ if (bindex < 0 || au_sbbot(sb) < bindex) {
++ errorfc(fc, "out of bounds, %d", bindex);
++ goto out;
++ }
++
++ err = 0;
++ del->h_path.dentry = dget(au_h_dptr(root, bindex));
++ del->h_path.mnt = mntget(au_sbr_mnt(sb, bindex));
++
++out:
++ aufs_read_unlock(root, !AuLock_IR);
++ AuTraceErr(err);
++ return err;
++}
++#endif
++
++static int au_fsctx_parse_mod(struct fs_context *fc, struct au_opt_mod *mod,
++ struct fs_parameter *param)
++{
++ int err;
++ struct path path;
++ char *p;
++
++ err = -ENOMEM;
++ /* will be freed by au_fsctx_free() */
++ mod->path = kmemdup_nul(param->string, param->size, GFP_NOFS);
++ if (unlikely(!mod->path))
++ goto out;
++
++ err = -EINVAL;
++ p = strchr(mod->path, '=');
++ if (unlikely(!p)) {
++ errorfc(fc, "no permission %s", mod->path);
++ goto out;
++ }
++
++ *p++ = 0;
++ err = vfsub_kern_path(mod->path, AuOpt_LkupDirFlags, &path);
++ if (unlikely(err)) {
++ errorfc(fc, "lookup failed %s (%d)", mod->path, err);
++ goto out;
++ }
++
++ mod->perm = au_br_perm_val(p);
++ AuDbg("mod path %s, perm 0x%x, %s", mod->path, mod->perm, p);
++ mod->h_root = dget(path.dentry);
++ path_put(&path);
++
++out:
++ AuTraceErr(err);
++ return err;
++}
++
++#if 0 /* reserved for future use */
++static int au_fsctx_parse_imod(struct fs_context *fc, struct au_opt_mod *mod,
++ char *ibrspec)
++{
++ int err, n;
++ char *p;
++ struct super_block *sb;
++ struct dentry *root;
++ struct au_fsctx_opts *a = fc->fs_private;
++
++ sb = a->sb;
++ AuDebugOn(!sb);
++
++ err = -EINVAL;
++ p = strchr(ibrspec, ':');
++ if (unlikely(!p)) {
++ errorfc(fc, "no index, %s", ibrspec);
++ goto out;
++ }
++ *p++ = '\0';
++ err = kstrtoint(ibrspec, 0, &n);
++ if (unlikely(err)) {
++ errorfc(fc, "bad integer in %s", ibrspec);
++ goto out;
++ }
++ AuDbg("n %d\n", n);
++
++ root = sb->s_root;
++ aufs_read_lock(root, AuLock_FLUSH);
++ if (n < 0 || au_sbbot(sb) < n) {
++ errorfc(fc, "out of bounds, %d", bindex);
++ goto out_root;
++ }
++
++ err = 0;
++ mod->perm = au_br_perm_val(p);
++ AuDbg("mod path %s, perm 0x%x, %s\n",
++ mod->path, mod->perm, p);
++ mod->h_root = dget(au_h_dptr(root, bindex));
++
++out_root:
++ aufs_read_unlock(root, !AuLock_IR);
++out:
++ AuTraceErr(err);
++ return err;
++}
++#endif
++
++static int au_fsctx_parse_xino(struct fs_context *fc,
++ struct au_opt_xino *xino,
++ struct fs_parameter *param)
++{
++ int err;
++ struct au_fsctx_opts *a = fc->fs_private;
++
++ err = -ENOMEM;
++ /* will be freed by au_opts_free() */
++ xino->path = kmemdup_nul(param->string, param->size, GFP_NOFS);
++ if (unlikely(!xino->path))
++ goto out;
++ AuDbg("path %s\n", xino->path);
++
++ xino->file = au_xino_create(a->sb, xino->path, /*silent*/0,
++ /*wbrtop*/0);
++ err = PTR_ERR(xino->file);
++ if (IS_ERR(xino->file)) {
++ xino->file = NULL;
++ goto out;
++ }
++
++ err = 0;
++ if (unlikely(a->sb && xino->file->f_path.dentry->d_sb == a->sb)) {
++ err = -EINVAL;
++ errorfc(fc, "%s must be outside", xino->path);
++ }
++
++out:
++ AuTraceErr(err);
++ return err;
++}
++
++static
++int au_fsctx_parse_xino_itrunc_path(struct fs_context *fc,
++ struct au_opt_xino_itrunc *xino_itrunc,
++ char *pathname)
++{
++ int err;
++ aufs_bindex_t bbot, bindex;
++ struct path path;
++ struct dentry *root;
++ struct au_fsctx_opts *a = fc->fs_private;
++
++ AuDebugOn(!a->sb);
++
++ err = vfsub_kern_path(pathname, AuOpt_LkupDirFlags, &path);
++ if (unlikely(err)) {
++ errorfc(fc, "lookup failed %s (%d)", pathname, err);
++ goto out;
++ }
++
++ xino_itrunc->bindex = -1;
++ root = a->sb->s_root;
++ aufs_read_lock(root, AuLock_FLUSH);
++ bbot = au_sbbot(a->sb);
++ for (bindex = 0; bindex <= bbot; bindex++) {
++ if (au_h_dptr(root, bindex) == path.dentry) {
++ xino_itrunc->bindex = bindex;
++ break;
++ }
++ }
++ aufs_read_unlock(root, !AuLock_IR);
++ path_put(&path);
++
++ if (unlikely(xino_itrunc->bindex < 0)) {
++ err = -EINVAL;
++ errorfc(fc, "no such branch %s", pathname);
++ }
++
++out:
++ AuTraceErr(err);
++ return err;
++}
++
++static int au_fsctx_parse_xino_itrunc(struct fs_context *fc,
++ struct au_opt_xino_itrunc *xino_itrunc,
++ unsigned int bindex)
++{
++ int err;
++ aufs_bindex_t bbot;
++ struct super_block *sb;
++ struct au_fsctx_opts *a = fc->fs_private;
++
++ sb = a->sb;
++ AuDebugOn(!sb);
++
++ err = 0;
++ si_noflush_read_lock(sb);
++ bbot = au_sbbot(sb);
++ si_read_unlock(sb);
++ if (bindex <= bbot)
++ xino_itrunc->bindex = bindex;
++ else {
++ err = -EINVAL;
++ errorfc(fc, "out of bounds, %u", bindex);
++ }
++
++ AuTraceErr(err);
++ return err;
++}
++
++static int au_fsctx_parse_param(struct fs_context *fc, struct fs_parameter *param)
++{
++ int err, token;
++ struct fs_parse_result result;
++ struct au_fsctx_opts *a = fc->fs_private;
++ struct au_opt *opt = a->opt;
++
++ AuDbg("fc %p, param {key %s, string %s}\n",
++ fc, param->key, param->string);
++ err = fs_parse(fc, aufs_fsctx_paramspec, param, &result);
++ if (unlikely(err < 0))
++ goto out;
++ token = err;
++ AuDbg("token %d, res{negated %d, uint64 %llu}\n",
++ token, result.negated, result.uint_64);
++
++ err = -EINVAL;
++ a->skipped = 0;
++ switch (token) {
++ case Opt_br:
++ err = au_fsctx_parse_br(fc, param->string);
++ break;
++ case Opt_add:
++ err = au_fsctx_parse_add(fc, param->string);
++ break;
++ case Opt_append:
++ err = au_fsctx_parse_do_add(fc, opt, param->string, param->size,
++ /*dummy bindex*/1);
++ break;
++ case Opt_prepend:
++ err = au_fsctx_parse_do_add(fc, opt, param->string, param->size,
++ /*bindex*/0);
++ break;
++
++ case Opt_del:
++ err = au_fsctx_parse_del(fc, &opt->del, param);
++ break;
++#if 0 /* reserved for future use */
++ case Opt_idel:
++ if (!a->sb) {
++ err = 0;
++ a->skipped = 1;
++ break;
++ }
++ del->pathname = "(indexed)";
++ err = au_opts_parse_idel(fc, &opt->del, result.uint_32);
++ break;
++#endif
++
++ case Opt_mod:
++ err = au_fsctx_parse_mod(fc, &opt->mod, param);
++ break;
++#ifdef IMOD /* reserved for future use */
++ case Opt_imod:
++ if (!a->sb) {
++ err = 0;
++ a->skipped = 1;
++ break;
++ }
++ u.mod->path = "(indexed)";
++ err = au_opts_parse_imod(fc, &opt->mod, param->string);
++ break;
++#endif
++
++ case Opt_xino:
++ err = au_fsctx_parse_xino(fc, &opt->xino, param);
++ break;
++ case Opt_trunc_xino_path:
++ if (!a->sb) {
++ errorfc(fc, "no such branch %s", param->string);
++ break;
++ }
++ err = au_fsctx_parse_xino_itrunc_path(fc, &opt->xino_itrunc,
++ param->string);
++ break;
++#if 0
++ case Opt_trunc_xino_v:
++ if (!a->sb) {
++ err = 0;
++ a->skipped = 1;
++ break;
++ }
++ err = au_fsctx_parse_xino_itrunc_path(fc, &opt->xino_itrunc,
++ param->string);
++ break;
++#endif
++ case Opt_itrunc_xino:
++ if (!a->sb) {
++ errorfc(fc, "out of bounds %s", param->string);
++ break;
++ }
++ err = au_fsctx_parse_xino_itrunc(fc, &opt->xino_itrunc,
++ result.int_32);
++ break;
++
++ case Opt_dirwh:
++ err = 0;
++ opt->dirwh = result.int_32;
++ break;
++
++ case Opt_rdcache:
++ if (unlikely(result.int_32 > AUFS_RDCACHE_MAX)) {
++ errorfc(fc, "rdcache must be smaller than %d",
++ AUFS_RDCACHE_MAX);
++ break;
++ }
++ err = 0;
++ opt->rdcache = result.int_32;
++ break;
++
++ case Opt_rdblk:
++ err = 0;
++ opt->rdblk = AUFS_RDBLK_DEF;
++ if (!strcmp(param->string, "def"))
++ break;
++
++ err = kstrtoint(param->string, 0, &result.int_32);
++ if (unlikely(err)) {
++ errorfc(fc, "bad value in %s", param->key);
++ break;
++ }
++ err = -EINVAL;
++ if (unlikely(result.int_32 < 0
++ || result.int_32 > KMALLOC_MAX_SIZE)) {
++ errorfc(fc, "bad value in %s", param->key);
++ break;
++ }
++ if (unlikely(result.int_32 && result.int_32 < NAME_MAX)) {
++ errorfc(fc, "rdblk must be larger than %d", NAME_MAX);
++ break;
++ }
++ err = 0;
++ opt->rdblk = result.int_32;
++ break;
++
++ case Opt_rdhash:
++ err = 0;
++ opt->rdhash = AUFS_RDHASH_DEF;
++ if (!strcmp(param->string, "def"))
++ break;
++
++ err = kstrtoint(param->string, 0, &result.int_32);
++ if (unlikely(err)) {
++ errorfc(fc, "bad value in %s", param->key);
++ break;
++ }
++ /* how about zero? */
++ if (result.int_32 < 0
++ || result.int_32 * sizeof(struct hlist_head)
++ > KMALLOC_MAX_SIZE) {
++ err = -EINVAL;
++ errorfc(fc, "bad integer in %s", param->key);
++ break;
++ }
++ opt->rdhash = result.int_32;
++ break;
++
++ case Opt_diropq:
++ /*
++ * As other options, fs/aufs/opts.c can handle these strings by
++ * match_token(). But "diropq=" is deprecated now and will
++ * never have other value. So simple strcmp() is enough here.
++ */
++ if (!strcmp(param->string, "a") ||
++ !strcmp(param->string, "always")) {
++ err = 0;
++ opt->type = Opt_diropq_a;
++ } else if (!strcmp(param->string, "w") ||
++ !strcmp(param->string, "whiteouted")) {
++ err = 0;
++ opt->type = Opt_diropq_w;
++ } else
++ errorfc(fc, "unknown value %s", param->string);
++ break;
++
++ case Opt_udba:
++ opt->udba = au_udba_val(param->string);
++ if (opt->udba >= 0)
++ err = 0;
++ else
++ errorf(fc, "wrong value, %s", param->string);
++ break;
++
++ case Opt_wbr_create:
++ opt->wbr_create.wbr_create
++ = au_wbr_create_val(param->string, &opt->wbr_create);
++ if (opt->wbr_create.wbr_create >= 0)
++ err = 0;
++ else
++ errorf(fc, "wrong value, %s", param->key);
++ break;
++
++ case Opt_wbr_copyup:
++ opt->wbr_copyup = au_wbr_copyup_val(param->string);
++ if (opt->wbr_copyup >= 0)
++ err = 0;
++ else
++ errorfc(fc, "wrong value, %s", param->key);
++ break;
++
++ case Opt_fhsm_sec:
++ if (unlikely(result.int_32 < 0)) {
++ errorfc(fc, "bad integer in %s\n", param->key);
++ break;
++ }
++ err = 0;
++ if (sysaufs_brs)
++ opt->fhsm_second = result.int_32;
++ else
++ warnfc(fc, "ignored %s %s", param->key, param->string);
++ break;
++
++ /* simple true/false flag */
++#define au_fsctx_TF(name) \
++ case Opt_##name: \
++ err = 0; \
++ opt->tf = !result.negated; \
++ break
++ au_fsctx_TF(trunc_xino);
++ au_fsctx_TF(trunc_xib);
++ au_fsctx_TF(dirperm1);
++ au_fsctx_TF(plink);
++ au_fsctx_TF(shwh);
++ au_fsctx_TF(dio);
++ au_fsctx_TF(warn_perm);
++ au_fsctx_TF(verbose);
++ au_fsctx_TF(sum);
++ au_fsctx_TF(dirren);
++ au_fsctx_TF(acl);
++#undef au_fsctx_TF
++
++ case Opt_noverbose:
++ err = 0;
++ opt->type = Opt_verbose;
++ opt->tf = false;
++ break;
++
++ case Opt_noxino:
++ fallthrough;
++ case Opt_list_plink:
++ fallthrough;
++ case Opt_wsum:
++ err = 0;
++ break;
++
++ case Opt_ignore:
++ warnfc(fc, "ignored %s", param->key);
++ fallthrough;
++ case Opt_ignore_silent:
++ a->skipped = 1;
++ err = 0;
++ break;
++ default:
++ a->skipped = 1;
++ err = -ENOPARAM;
++ break;
++ }
++ if (unlikely(err))
++ goto out;
++ if (a->skipped)
++ goto out;
++
++ switch (token) {
++ case Opt_br:
++ fallthrough;
++ case Opt_noverbose:
++ fallthrough;
++ case Opt_diropq:
++ break;
++ default:
++ opt->type = token;
++ break;
++ }
++ opt++;
++ if (unlikely(opt > a->opt_tail)) {
++ err = -E2BIG;
++ opt--;
++ }
++ opt->type = Opt_tail;
++ a->opt = opt;
++
++out:
++ return err;
++}
++
++/*
++ * these options accept both 'name=val' and 'name:val' form.
++ * some accept optional '=' in its value.
++ * eg. br:/br1=rw:/br2=ro and br=/br1=rw:/br2=ro
++ */
++static inline unsigned int is_colonopt(char *str)
++{
++#define do_test(name) \
++ if (!strncmp(str, name ":", sizeof(name))) \
++ return sizeof(name) - 1
++ do_test("br");
++ do_test("add");
++ do_test("ins");
++ do_test("append");
++ do_test("prepend");
++ do_test("del");
++ /* do_test("idel"); */
++ do_test("mod");
++ /* do_test("imod"); */
++#undef do_test
++
++ return 0;
++}
++
++static int au_fsctx_parse_monolithic(struct fs_context *fc, void *data)
++{
++ int err;
++ unsigned int u;
++ char *str;
++ struct au_fsctx_opts *a = fc->fs_private;
++
++ str = data;
++ AuDbg("str %s\n", str);
++ while (str) {
++ u = is_colonopt(str);
++ if (u)
++ str[u] = '=';
++ str = strchr(str, ',');
++ if (!str)
++ break;
++ str++;
++ }
++ str = data;
++ AuDbg("str %s\n", str);
++
++ err = generic_parse_monolithic(fc, str);
++ AuTraceErr(err);
++ au_fsctx_dump(&a->opts);
++
++ return err;
++}
++
++/* ---------------------------------------------------------------------- */
++
++static void au_fsctx_opts_free(struct au_opts *opts)
++{
++ struct au_opt *opt;
++
++ opt = opts->opt;
++ while (opt->type != Opt_tail) {
++ switch (opt->type) {
++ case Opt_add:
++ fallthrough;
++ case Opt_append:
++ fallthrough;
++ case Opt_prepend:
++ kfree(opt->add.pathname);
++ path_put(&opt->add.path);
++ break;
++ case Opt_del:
++ kfree(opt->del.pathname);
++ fallthrough;
++ case Opt_idel:
++ path_put(&opt->del.h_path);
++ break;
++ case Opt_mod:
++ kfree(opt->mod.path);
++ fallthrough;
++ case Opt_imod:
++ dput(opt->mod.h_root);
++ break;
++ case Opt_xino:
++ kfree(opt->xino.path);
++ fput(opt->xino.file);
++ break;
++ }
++ opt++;
++ }
++}
++
++static void au_fsctx_free(struct fs_context *fc)
++{
++ struct au_fsctx_opts *a = fc->fs_private;
++
++ /* fs_type=%p, root=%pD */
++ AuDbg("fc %p{sb_flags 0x%x, sb_flags_mask 0x%x, purpose %u\n",
++ fc, fc->sb_flags, fc->sb_flags_mask, fc->purpose);
++
++ kobject_put(&a->sbinfo->si_kobj);
++ au_fsctx_opts_free(&a->opts);
++ free_page((unsigned long)a->opts.opt);
++ au_kfree_rcu(a);
++}
++
++static const struct fs_context_operations au_fsctx_ops = {
++ .free = au_fsctx_free,
++ .parse_param = au_fsctx_parse_param,
++ .parse_monolithic = au_fsctx_parse_monolithic,
++ .get_tree = au_fsctx_get_tree,
++ .reconfigure = au_fsctx_reconfigure
++ /*
++ * nfs4 requires ->dup()? No.
++ * I don't know what is this ->dup() for.
++ */
++};
++
++int aufs_fsctx_init(struct fs_context *fc)
++{
++ int err;
++ struct au_fsctx_opts *a;
++
++ /* fs_type=%p, root=%pD */
++ AuDbg("fc %p{sb_flags 0x%x, sb_flags_mask 0x%x, purpose %u\n",
++ fc, fc->sb_flags, fc->sb_flags_mask, fc->purpose);
++
++ /* they will be freed by au_fsctx_free() */
++ err = -ENOMEM;
++ a = kzalloc(sizeof(*a), GFP_NOFS);
++ if (unlikely(!a))
++ goto out;
++ a->bindex = 0;
++ a->opts.opt = (void *)__get_free_page(GFP_NOFS);
++ if (unlikely(!a->opts.opt))
++ goto out_a;
++ a->opt = a->opts.opt;
++ a->opt->type = Opt_tail;
++ a->opts.max_opt = PAGE_SIZE / sizeof(*a->opts.opt);
++ a->opt_tail = a->opt + a->opts.max_opt - 1;
++ a->opts.sb_flags = fc->sb_flags;
++
++ a->sb = NULL;
++ if (fc->root) {
++ AuDebugOn(fc->purpose != FS_CONTEXT_FOR_RECONFIGURE);
++ a->opts.flags = AuOpts_REMOUNT;
++ a->sb = fc->root->d_sb;
++ a->sbinfo = au_sbi(a->sb);
++ kobject_get(&a->sbinfo->si_kobj);
++ } else {
++ a->sbinfo = au_si_alloc(a->sb);
++ AuDebugOn(!a->sbinfo);
++ err = PTR_ERR(a->sbinfo);
++ if (IS_ERR(a->sbinfo))
++ goto out_opt;
++ au_rw_write_unlock(&a->sbinfo->si_rwsem);
++ }
++
++ err = 0;
++ fc->fs_private = a;
++ fc->ops = &au_fsctx_ops;
++ goto out; /* success */
++
++out_opt:
++ free_page((unsigned long)a->opts.opt);
++out_a:
++ au_kfree_rcu(a);
++out:
++ AuTraceErr(err);
++ return err;
++}
+diff -urN /usr/share/empty/fs/aufs/fstype.h linux/fs/aufs/fstype.h
+--- /usr/share/empty/fs/aufs/fstype.h 1970-01-01 01:00:00.000000000 +0100
++++ linux/fs/aufs/fstype.h 2022-08-02 12:12:45.165641939 +0200
+@@ -0,0 +1,401 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++/*
++ * Copyright (C) 2005-2021 Junjiro R. Okajima
++ *
++ * This program, aufs is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program. If not, see <http://www.gnu.org/licenses/>.
++ */
++
++/*
++ * judging filesystem type
++ */
++
++#ifndef __AUFS_FSTYPE_H__
++#define __AUFS_FSTYPE_H__
++
++#ifdef __KERNEL__
++
++#include <linux/fs.h>
++#include <linux/magic.h>
++#include <linux/nfs_fs.h>
++#include <linux/romfs_fs.h>
++
++static inline int au_test_aufs(struct super_block *sb)
++{
++ return sb->s_magic == AUFS_SUPER_MAGIC;
++}
++
++static inline const char *au_sbtype(struct super_block *sb)
++{
++ return sb->s_type->name;
++}
++
++static inline int au_test_iso9660(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_ISO9660_FS)
++ return sb->s_magic == ISOFS_SUPER_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_romfs(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_ROMFS_FS)
++ return sb->s_magic == ROMFS_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_cramfs(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_CRAMFS)
++ return sb->s_magic == CRAMFS_MAGIC;
++#endif
++ return 0;
++}
++
++static inline int au_test_nfs(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_NFS_FS)
++ return sb->s_magic == NFS_SUPER_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_fuse(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_FUSE_FS)
++ return sb->s_magic == FUSE_SUPER_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_xfs(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_XFS_FS)
++ return sb->s_magic == XFS_SB_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_tmpfs(struct super_block *sb __maybe_unused)
++{
++#ifdef CONFIG_TMPFS
++ return sb->s_magic == TMPFS_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_ecryptfs(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_ECRYPT_FS)
++ return !strcmp(au_sbtype(sb), "ecryptfs");
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_ramfs(struct super_block *sb)
++{
++ return sb->s_magic == RAMFS_MAGIC;
++}
++
++static inline int au_test_ubifs(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_UBIFS_FS)
++ return sb->s_magic == UBIFS_SUPER_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_procfs(struct super_block *sb __maybe_unused)
++{
++#ifdef CONFIG_PROC_FS
++ return sb->s_magic == PROC_SUPER_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_sysfs(struct super_block *sb __maybe_unused)
++{
++#ifdef CONFIG_SYSFS
++ return sb->s_magic == SYSFS_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_configfs(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_CONFIGFS_FS)
++ return sb->s_magic == CONFIGFS_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_minix(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_MINIX_FS)
++ return sb->s_magic == MINIX3_SUPER_MAGIC
++ || sb->s_magic == MINIX2_SUPER_MAGIC
++ || sb->s_magic == MINIX2_SUPER_MAGIC2
++ || sb->s_magic == MINIX_SUPER_MAGIC
++ || sb->s_magic == MINIX_SUPER_MAGIC2;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_fat(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_FAT_FS)
++ return sb->s_magic == MSDOS_SUPER_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_msdos(struct super_block *sb)
++{
++ return au_test_fat(sb);
++}
++
++static inline int au_test_vfat(struct super_block *sb)
++{
++ return au_test_fat(sb);
++}
++
++static inline int au_test_securityfs(struct super_block *sb __maybe_unused)
++{
++#ifdef CONFIG_SECURITYFS
++ return sb->s_magic == SECURITYFS_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_squashfs(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_SQUASHFS)
++ return sb->s_magic == SQUASHFS_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_btrfs(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_BTRFS_FS)
++ return sb->s_magic == BTRFS_SUPER_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_xenfs(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_XENFS)
++ return sb->s_magic == XENFS_SUPER_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_debugfs(struct super_block *sb __maybe_unused)
++{
++#ifdef CONFIG_DEBUG_FS
++ return sb->s_magic == DEBUGFS_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_nilfs(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_NILFS)
++ return sb->s_magic == NILFS_SUPER_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++static inline int au_test_hfsplus(struct super_block *sb __maybe_unused)
++{
++#if IS_ENABLED(CONFIG_HFSPLUS_FS)
++ return sb->s_magic == HFSPLUS_SUPER_MAGIC;
++#else
++ return 0;
++#endif
++}
++
++/* ---------------------------------------------------------------------- */
++/*
++ * they can't be an aufs branch.
++ */
++static inline int au_test_fs_unsuppoted(struct super_block *sb)
++{
++ return
++#ifndef CONFIG_AUFS_BR_RAMFS
++ au_test_ramfs(sb) ||
++#endif
++ au_test_procfs(sb)
++ || au_test_sysfs(sb)
++ || au_test_configfs(sb)
++ || au_test_debugfs(sb)
++ || au_test_securityfs(sb)
++ || au_test_xenfs(sb)
++ || au_test_ecryptfs(sb)
++ /* || !strcmp(au_sbtype(sb), "unionfs") */
++ || au_test_aufs(sb); /* will be supported in next version */
++}
++
++static inline int au_test_fs_remote(struct super_block *sb)
++{
++ return !au_test_tmpfs(sb)
++#ifdef CONFIG_AUFS_BR_RAMFS
++ && !au_test_ramfs(sb)
++#endif
++ && !(sb->s_type->fs_flags & FS_REQUIRES_DEV);
++}
++
++/* ---------------------------------------------------------------------- */