2 * linux/fs/reiserfs/xattr.c
4 * Copyright (c) 2002 by Jeff Mahoney, <jeffm@suse.com>
9 * In order to implement EA/ACLs in a clean, backwards compatible manner,
10 * they are implemented as files in a "private" directory.
11 * Each EA is in it's own file, with the directory layout like so (/ is assumed
12 * to be relative to fs root). Inside the /.reiserfs_priv/xattrs directory,
13 * directories named using the capital-hex form of the objectid and
14 * generation number are used. Inside each directory are individual files
15 * named with the name of the extended attribute.
17 * So, for objectid 12648430, we could have:
18 * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_access
19 * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_default
20 * /.reiserfs_priv/xattrs/C0FFEE.0/user.Content-Type
23 * The file contents are the text of the EA. The size is known based on the
24 * stat data describing the file.
26 * In the case of system.posix_acl_access and system.posix_acl_default, since
27 * these are special cases for filesystem ACLs, they are interpreted by the
28 * kernel, in addition, they are negatively and positively cached and attached
29 * to the inode so that unnecessary lookups are avoided.
31 * Locking works like so:
32 * Directory components (xattr root, xattr dir) are protectd by their i_mutex.
33 * The xattrs themselves are protected by the xattr_sem.
37 #include <linux/capability.h>
38 #include <linux/dcache.h>
39 #include <linux/namei.h>
40 #include <linux/errno.h>
41 #include <linux/gfp.h>
43 #include <linux/file.h>
44 #include <linux/pagemap.h>
45 #include <linux/xattr.h>
48 #include <linux/uaccess.h>
49 #include <net/checksum.h>
50 #include <linux/stat.h>
51 #include <linux/quotaops.h>
52 #include <linux/security.h>
53 #include <linux/posix_acl_xattr.h>
55 #define PRIVROOT_NAME ".reiserfs_priv"
56 #define XAROOT_NAME "xattrs"
60 * Helpers for inode ops. We do this so that we don't have all the VFS
61 * overhead and also for proper i_mutex annotation.
62 * dir->i_mutex must be held for all of them.
64 #ifdef CONFIG_REISERFS_FS_XATTR
65 static int xattr_create(struct inode *dir, struct dentry *dentry, int mode)
67 BUG_ON(!inode_is_locked(dir));
68 return dir->i_op->create(dir, dentry, mode, true);
72 static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
74 BUG_ON(!inode_is_locked(dir));
75 return dir->i_op->mkdir(dir, dentry, mode);
79 * We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr
80 * mutation ops aren't called during rename or splace, which are the
81 * only other users of I_MUTEX_CHILD. It violates the ordering, but that's
82 * better than allocating another subclass just for this code.
84 static int xattr_unlink(struct inode *dir, struct dentry *dentry)
88 BUG_ON(!inode_is_locked(dir));
90 inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD);
91 error = dir->i_op->unlink(dir, dentry);
92 inode_unlock(d_inode(dentry));
99 static int xattr_rmdir(struct inode *dir, struct dentry *dentry)
103 BUG_ON(!inode_is_locked(dir));
105 inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD);
106 error = dir->i_op->rmdir(dir, dentry);
108 d_inode(dentry)->i_flags |= S_DEAD;
109 inode_unlock(d_inode(dentry));
116 #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE)
118 static struct dentry *open_xa_root(struct super_block *sb, int flags)
120 struct dentry *privroot = REISERFS_SB(sb)->priv_root;
121 struct dentry *xaroot;
123 if (d_really_is_negative(privroot))
124 return ERR_PTR(-EOPNOTSUPP);
126 inode_lock_nested(d_inode(privroot), I_MUTEX_XATTR);
128 xaroot = dget(REISERFS_SB(sb)->xattr_root);
130 xaroot = ERR_PTR(-EOPNOTSUPP);
131 else if (d_really_is_negative(xaroot)) {
134 if (xattr_may_create(flags))
135 err = xattr_mkdir(d_inode(privroot), xaroot, 0700);
138 xaroot = ERR_PTR(err);
142 inode_unlock(d_inode(privroot));
146 static struct dentry *open_xa_dir(const struct inode *inode, int flags)
148 struct dentry *xaroot, *xadir;
151 xaroot = open_xa_root(inode->i_sb, flags);
155 snprintf(namebuf, sizeof(namebuf), "%X.%X",
156 le32_to_cpu(INODE_PKEY(inode)->k_objectid),
157 inode->i_generation);
159 inode_lock_nested(d_inode(xaroot), I_MUTEX_XATTR);
161 xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf));
162 if (!IS_ERR(xadir) && d_really_is_negative(xadir)) {
165 if (xattr_may_create(flags))
166 err = xattr_mkdir(d_inode(xaroot), xadir, 0700);
169 xadir = ERR_PTR(err);
173 inode_unlock(d_inode(xaroot));
179 * The following are side effects of other operations that aren't explicitly
180 * modifying extended attributes. This includes operations such as permissions
181 * or ownership changes, object deletions, etc.
183 struct reiserfs_dentry_buf {
184 struct dir_context ctx;
185 struct dentry *xadir;
188 struct dentry *dentries[8];
192 fill_with_dentries(struct dir_context *ctx, const char *name, int namelen,
193 loff_t offset, u64 ino, unsigned int d_type)
195 struct reiserfs_dentry_buf *dbuf =
196 container_of(ctx, struct reiserfs_dentry_buf, ctx);
197 struct dentry *dentry;
199 WARN_ON_ONCE(!inode_is_locked(d_inode(dbuf->xadir)));
201 if (dbuf->count == ARRAY_SIZE(dbuf->dentries))
204 if (name[0] == '.' && (namelen < 2 ||
205 (namelen == 2 && name[1] == '.')))
208 dentry = lookup_one_len(name, dbuf->xadir, namelen);
209 if (IS_ERR(dentry)) {
210 dbuf->err = PTR_ERR(dentry);
211 return PTR_ERR(dentry);
212 } else if (d_really_is_negative(dentry)) {
213 /* A directory entry exists, but no file? */
214 reiserfs_error(dentry->d_sb, "xattr-20003",
215 "Corrupted directory: xattr %pd listed but "
216 "not found for file %pd.\n",
217 dentry, dbuf->xadir);
223 dbuf->dentries[dbuf->count++] = dentry;
228 cleanup_dentry_buf(struct reiserfs_dentry_buf *buf)
232 for (i = 0; i < buf->count; i++)
233 if (buf->dentries[i])
234 dput(buf->dentries[i]);
237 static int reiserfs_for_each_xattr(struct inode *inode,
238 int (*action)(struct dentry *, void *),
243 struct reiserfs_dentry_buf buf = {
244 .ctx.actor = fill_with_dentries,
247 /* Skip out, an xattr has no xattrs associated with it */
248 if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1)
251 dir = open_xa_dir(inode, XATTR_REPLACE);
255 } else if (d_really_is_negative(dir)) {
260 inode_lock_nested(d_inode(dir), I_MUTEX_XATTR);
264 err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx);
273 for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) {
274 struct dentry *dentry = buf.dentries[i];
276 if (!d_is_dir(dentry))
277 err = action(dentry, data);
280 buf.dentries[i] = NULL;
286 inode_unlock(d_inode(dir));
288 cleanup_dentry_buf(&buf);
292 * We start a transaction here to avoid a ABBA situation
293 * between the xattr root's i_mutex and the journal lock.
294 * This doesn't incur much additional overhead since the
295 * new transaction will just nest inside the
298 int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 +
299 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
300 struct reiserfs_transaction_handle th;
302 reiserfs_write_lock(inode->i_sb);
303 err = journal_begin(&th, inode->i_sb, blocks);
304 reiserfs_write_unlock(inode->i_sb);
308 inode_lock_nested(d_inode(dir->d_parent),
310 err = action(dir, data);
311 reiserfs_write_lock(inode->i_sb);
312 jerror = journal_end(&th);
313 reiserfs_write_unlock(inode->i_sb);
314 inode_unlock(d_inode(dir->d_parent));
322 * -ENODATA: this object doesn't have any xattrs
323 * -EOPNOTSUPP: this file system doesn't have xattrs enabled on disk.
326 if (err == -ENODATA || err == -EOPNOTSUPP)
331 static int delete_one_xattr(struct dentry *dentry, void *data)
333 struct inode *dir = d_inode(dentry->d_parent);
335 /* This is the xattr dir, handle specially. */
336 if (d_is_dir(dentry))
337 return xattr_rmdir(dir, dentry);
339 return xattr_unlink(dir, dentry);
342 static int chown_one_xattr(struct dentry *dentry, void *data)
344 struct iattr *attrs = data;
345 int ia_valid = attrs->ia_valid;
349 * We only want the ownership bits. Otherwise, we'll do
350 * things like change a directory to a regular file if
353 attrs->ia_valid &= (ATTR_UID|ATTR_GID);
354 err = reiserfs_setattr(dentry, attrs);
355 attrs->ia_valid = ia_valid;
360 /* No i_mutex, but the inode is unconnected. */
361 int reiserfs_delete_xattrs(struct inode *inode)
363 int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL);
366 reiserfs_warning(inode->i_sb, "jdm-20004",
367 "Couldn't delete all xattrs (%d)\n", err);
371 /* inode->i_mutex: down */
372 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs)
374 int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs);
377 reiserfs_warning(inode->i_sb, "jdm-20007",
378 "Couldn't chown all xattrs (%d)\n", err);
382 #ifdef CONFIG_REISERFS_FS_XATTR
384 * Returns a dentry corresponding to a specific extended attribute file
385 * for the inode. If flags allow, the file is created. Otherwise, a
386 * valid or negative dentry, or an error is returned.
388 static struct dentry *xattr_lookup(struct inode *inode, const char *name,
391 struct dentry *xadir, *xafile;
394 xadir = open_xa_dir(inode, flags);
396 return ERR_CAST(xadir);
398 inode_lock_nested(d_inode(xadir), I_MUTEX_XATTR);
399 xafile = lookup_one_len(name, xadir, strlen(name));
400 if (IS_ERR(xafile)) {
401 err = PTR_ERR(xafile);
405 if (d_really_is_positive(xafile) && (flags & XATTR_CREATE))
408 if (d_really_is_negative(xafile)) {
410 if (xattr_may_create(flags))
411 err = xattr_create(d_inode(xadir), xafile,
418 inode_unlock(d_inode(xadir));
425 /* Internal operations on file data */
426 static inline void reiserfs_put_page(struct page *page)
432 static struct page *reiserfs_get_page(struct inode *dir, size_t n)
434 struct address_space *mapping = dir->i_mapping;
437 * We can deadlock if we try to free dentries,
438 * and an unlink/rmdir has just occurred - GFP_NOFS avoids this
440 mapping_set_gfp_mask(mapping, GFP_NOFS);
441 page = read_mapping_page(mapping, n >> PAGE_SHIFT, NULL);
450 reiserfs_put_page(page);
451 return ERR_PTR(-EIO);
454 static inline __u32 xattr_hash(const char *msg, int len)
456 return csum_partial(msg, len, 0);
459 int reiserfs_commit_write(struct file *f, struct page *page,
460 unsigned from, unsigned to);
462 static void update_ctime(struct inode *inode)
464 struct timespec now = current_time(inode);
466 if (inode_unhashed(inode) || !inode->i_nlink ||
467 timespec_equal(&inode->i_ctime, &now))
470 inode->i_ctime = current_time(inode);
471 mark_inode_dirty(inode);
474 static int lookup_and_delete_xattr(struct inode *inode, const char *name)
477 struct dentry *dentry, *xadir;
479 xadir = open_xa_dir(inode, XATTR_REPLACE);
481 return PTR_ERR(xadir);
483 inode_lock_nested(d_inode(xadir), I_MUTEX_XATTR);
484 dentry = lookup_one_len(name, xadir, strlen(name));
485 if (IS_ERR(dentry)) {
486 err = PTR_ERR(dentry);
490 if (d_really_is_positive(dentry)) {
491 err = xattr_unlink(d_inode(xadir), dentry);
497 inode_unlock(d_inode(xadir));
503 /* Generic extended attribute operations that can be used by xa plugins */
506 * inode->i_mutex: down
509 reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th,
510 struct inode *inode, const char *name,
511 const void *buffer, size_t buffer_size, int flags)
514 struct dentry *dentry;
518 size_t buffer_pos = 0;
522 if (get_inode_sd_version(inode) == STAT_DATA_V1)
526 err = lookup_and_delete_xattr(inode, name);
530 dentry = xattr_lookup(inode, name, flags);
532 return PTR_ERR(dentry);
534 down_write(&REISERFS_I(inode)->i_xattr_sem);
536 xahash = xattr_hash(buffer, buffer_size);
537 while (buffer_pos < buffer_size || buffer_pos == 0) {
540 size_t page_offset = (file_pos & (PAGE_SIZE - 1));
542 if (buffer_size - buffer_pos > PAGE_SIZE)
545 chunk = buffer_size - buffer_pos;
547 page = reiserfs_get_page(d_inode(dentry), file_pos);
554 data = page_address(page);
557 struct reiserfs_xattr_header *rxh;
559 skip = file_pos = sizeof(struct reiserfs_xattr_header);
560 if (chunk + skip > PAGE_SIZE)
561 chunk = PAGE_SIZE - skip;
562 rxh = (struct reiserfs_xattr_header *)data;
563 rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC);
564 rxh->h_hash = cpu_to_le32(xahash);
567 reiserfs_write_lock(inode->i_sb);
568 err = __reiserfs_write_begin(page, page_offset, chunk + skip);
571 memcpy(data + skip, buffer + buffer_pos, chunk);
572 err = reiserfs_commit_write(NULL, page, page_offset,
573 page_offset + chunk +
576 reiserfs_write_unlock(inode->i_sb);
578 reiserfs_put_page(page);
582 if (err || buffer_size == 0 || !buffer)
586 new_size = buffer_size + sizeof(struct reiserfs_xattr_header);
587 if (!err && new_size < i_size_read(d_inode(dentry))) {
588 struct iattr newattrs = {
589 .ia_ctime = current_time(inode),
591 .ia_valid = ATTR_SIZE | ATTR_CTIME,
594 inode_lock_nested(d_inode(dentry), I_MUTEX_XATTR);
595 inode_dio_wait(d_inode(dentry));
597 err = reiserfs_setattr(dentry, &newattrs);
598 inode_unlock(d_inode(dentry));
602 up_write(&REISERFS_I(inode)->i_xattr_sem);
607 /* We need to start a transaction to maintain lock ordering */
608 int reiserfs_xattr_set(struct inode *inode, const char *name,
609 const void *buffer, size_t buffer_size, int flags)
612 struct reiserfs_transaction_handle th;
614 size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size);
616 /* Check before we start a transaction and then do nothing. */
617 if (!d_really_is_positive(REISERFS_SB(inode->i_sb)->priv_root))
620 if (!(flags & XATTR_REPLACE))
621 jbegin_count += reiserfs_xattr_jcreate_nblocks(inode);
623 reiserfs_write_lock(inode->i_sb);
624 error = journal_begin(&th, inode->i_sb, jbegin_count);
625 reiserfs_write_unlock(inode->i_sb);
630 error = reiserfs_xattr_set_handle(&th, inode, name,
631 buffer, buffer_size, flags);
633 reiserfs_write_lock(inode->i_sb);
634 error2 = journal_end(&th);
635 reiserfs_write_unlock(inode->i_sb);
643 * inode->i_mutex: down
646 reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
650 struct dentry *dentry;
653 size_t buffer_pos = 0;
661 * We can't have xattrs attached to v1 items since they don't have
664 if (get_inode_sd_version(inode) == STAT_DATA_V1)
668 * priv_root needn't be initialized during mount so allow initial
669 * lookups to succeed.
671 if (!REISERFS_SB(inode->i_sb)->priv_root)
674 dentry = xattr_lookup(inode, name, XATTR_REPLACE);
675 if (IS_ERR(dentry)) {
676 err = PTR_ERR(dentry);
680 down_read(&REISERFS_I(inode)->i_xattr_sem);
682 isize = i_size_read(d_inode(dentry));
684 /* Just return the size needed */
685 if (buffer == NULL) {
686 err = isize - sizeof(struct reiserfs_xattr_header);
690 if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) {
695 while (file_pos < isize) {
700 if (isize - file_pos > PAGE_SIZE)
703 chunk = isize - file_pos;
705 page = reiserfs_get_page(d_inode(dentry), file_pos);
712 data = page_address(page);
714 struct reiserfs_xattr_header *rxh =
715 (struct reiserfs_xattr_header *)data;
716 skip = file_pos = sizeof(struct reiserfs_xattr_header);
718 /* Magic doesn't match up.. */
719 if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) {
721 reiserfs_put_page(page);
722 reiserfs_warning(inode->i_sb, "jdm-20001",
723 "Invalid magic for xattr (%s) "
724 "associated with %k", name,
729 hash = le32_to_cpu(rxh->h_hash);
731 memcpy(buffer + buffer_pos, data + skip, chunk);
733 reiserfs_put_page(page);
738 err = isize - sizeof(struct reiserfs_xattr_header);
740 if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) !=
742 reiserfs_warning(inode->i_sb, "jdm-20002",
743 "Invalid hash for xattr (%s) associated "
744 "with %k", name, INODE_PKEY(inode));
749 up_read(&REISERFS_I(inode)->i_xattr_sem);
757 * In order to implement different sets of xattr operations for each xattr
758 * prefix with the generic xattr API, a filesystem should create a
759 * null-terminated array of struct xattr_handler (one for each prefix) and
760 * hang a pointer to it off of the s_xattr field of the superblock.
762 * The generic_fooxattr() functions will use this list to dispatch xattr
763 * operations to the correct xattr_handler.
765 #define for_each_xattr_handler(handlers, handler) \
766 for ((handler) = *(handlers)++; \
768 (handler) = *(handlers)++)
770 /* This is the implementation for the xattr plugin infrastructure */
771 static inline const struct xattr_handler *
772 find_xattr_handler_prefix(const struct xattr_handler **handlers,
775 const struct xattr_handler *xah;
780 for_each_xattr_handler(handlers, xah) {
781 const char *prefix = xattr_prefix(xah);
782 if (strncmp(prefix, name, strlen(prefix)) == 0)
789 struct listxattr_buf {
790 struct dir_context ctx;
794 struct dentry *dentry;
797 static int listxattr_filler(struct dir_context *ctx, const char *name,
798 int namelen, loff_t offset, u64 ino,
801 struct listxattr_buf *b =
802 container_of(ctx, struct listxattr_buf, ctx);
805 if (name[0] != '.' ||
806 (namelen != 1 && (name[1] != '.' || namelen != 2))) {
807 const struct xattr_handler *handler;
809 handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr,
811 if (!handler /* Unsupported xattr name */ ||
812 (handler->list && !handler->list(b->dentry)))
816 if (b->pos + size > b->size) {
820 memcpy(b->buf + b->pos, name, namelen);
821 b->buf[b->pos + namelen] = 0;
829 * Inode operation listxattr()
831 * We totally ignore the generic listxattr here because it would be stupid
832 * not to. Since the xattrs are organized in a directory, we can just
833 * readdir to find them.
835 ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
839 struct listxattr_buf buf = {
840 .ctx.actor = listxattr_filler,
843 .size = buffer ? size : 0,
846 if (d_really_is_negative(dentry))
849 if (get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1)
852 dir = open_xa_dir(d_inode(dentry), XATTR_REPLACE);
856 err = 0; /* Not an error if there aren't any xattrs */
860 inode_lock_nested(d_inode(dir), I_MUTEX_XATTR);
861 err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx);
862 inode_unlock(d_inode(dir));
872 static int create_privroot(struct dentry *dentry)
875 struct inode *inode = d_inode(dentry->d_parent);
877 WARN_ON_ONCE(!inode_is_locked(inode));
879 err = xattr_mkdir(inode, dentry, 0700);
880 if (err || d_really_is_negative(dentry)) {
881 reiserfs_warning(dentry->d_sb, "jdm-20006",
882 "xattrs/ACLs enabled and couldn't "
883 "find/create .reiserfs_priv. "
888 d_inode(dentry)->i_flags |= S_PRIVATE;
889 d_inode(dentry)->i_opflags &= ~IOP_XATTR;
890 reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr "
891 "storage.\n", PRIVROOT_NAME);
897 int __init reiserfs_xattr_register_handlers(void) { return 0; }
898 void reiserfs_xattr_unregister_handlers(void) {}
899 static int create_privroot(struct dentry *dentry) { return 0; }
902 /* Actual operations that are exported to VFS-land */
903 const struct xattr_handler *reiserfs_xattr_handlers[] = {
904 #ifdef CONFIG_REISERFS_FS_XATTR
905 &reiserfs_xattr_user_handler,
906 &reiserfs_xattr_trusted_handler,
908 #ifdef CONFIG_REISERFS_FS_SECURITY
909 &reiserfs_xattr_security_handler,
911 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
912 &posix_acl_access_xattr_handler,
913 &posix_acl_default_xattr_handler,
918 static int xattr_mount_check(struct super_block *s)
921 * We need generation numbers to ensure that the oid mapping is correct
922 * v3.5 filesystems don't have them.
924 if (old_format_only(s)) {
925 if (reiserfs_xattrs_optional(s)) {
927 * Old format filesystem, but optional xattrs have
928 * been enabled. Error out.
930 reiserfs_warning(s, "jdm-2005",
931 "xattrs/ACLs not supported "
932 "on pre-v3.6 format filesystems. "
941 int reiserfs_permission(struct inode *inode, int mask)
944 * We don't do permission checks on the internal objects.
945 * Permissions are determined by the "owning" object.
947 if (IS_PRIVATE(inode))
950 return generic_permission(inode, mask);
953 static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags)
958 static const struct dentry_operations xattr_lookup_poison_ops = {
959 .d_revalidate = xattr_hide_revalidate,
962 int reiserfs_lookup_privroot(struct super_block *s)
964 struct dentry *dentry;
967 /* If we don't have the privroot located yet - go find it */
968 inode_lock(d_inode(s->s_root));
969 dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
970 strlen(PRIVROOT_NAME));
971 if (!IS_ERR(dentry)) {
972 REISERFS_SB(s)->priv_root = dentry;
973 d_set_d_op(dentry, &xattr_lookup_poison_ops);
974 if (d_really_is_positive(dentry)) {
975 d_inode(dentry)->i_flags |= S_PRIVATE;
976 d_inode(dentry)->i_opflags &= ~IOP_XATTR;
979 err = PTR_ERR(dentry);
980 inode_unlock(d_inode(s->s_root));
986 * We need to take a copy of the mount flags since things like
987 * MS_RDONLY don't get set until *after* we're called.
988 * mount_flags != mount_options
990 int reiserfs_xattr_init(struct super_block *s, int mount_flags)
993 struct dentry *privroot = REISERFS_SB(s)->priv_root;
995 err = xattr_mount_check(s);
999 if (d_really_is_negative(privroot) && !(mount_flags & MS_RDONLY)) {
1000 inode_lock(d_inode(s->s_root));
1001 err = create_privroot(REISERFS_SB(s)->priv_root);
1002 inode_unlock(d_inode(s->s_root));
1005 if (d_really_is_positive(privroot)) {
1006 inode_lock(d_inode(privroot));
1007 if (!REISERFS_SB(s)->xattr_root) {
1008 struct dentry *dentry;
1010 dentry = lookup_one_len(XAROOT_NAME, privroot,
1011 strlen(XAROOT_NAME));
1012 if (!IS_ERR(dentry))
1013 REISERFS_SB(s)->xattr_root = dentry;
1015 err = PTR_ERR(dentry);
1017 inode_unlock(d_inode(privroot));
1022 clear_bit(REISERFS_XATTRS_USER, &REISERFS_SB(s)->s_mount_opt);
1023 clear_bit(REISERFS_POSIXACL, &REISERFS_SB(s)->s_mount_opt);
1026 /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */
1027 if (reiserfs_posixacl(s))
1028 s->s_flags |= MS_POSIXACL;
1030 s->s_flags &= ~MS_POSIXACL;