1 // SPDX-License-Identifier: GPL-2.0
3 * linux/fs/reiserfs/xattr.c
5 * Copyright (c) 2002 by Jeff Mahoney, <jeffm@suse.com>
10 * In order to implement EA/ACLs in a clean, backwards compatible manner,
11 * they are implemented as files in a "private" directory.
12 * Each EA is in it's own file, with the directory layout like so (/ is assumed
13 * to be relative to fs root). Inside the /.reiserfs_priv/xattrs directory,
14 * directories named using the capital-hex form of the objectid and
15 * generation number are used. Inside each directory are individual files
16 * named with the name of the extended attribute.
18 * So, for objectid 12648430, we could have:
19 * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_access
20 * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_default
21 * /.reiserfs_priv/xattrs/C0FFEE.0/user.Content-Type
24 * The file contents are the text of the EA. The size is known based on the
25 * stat data describing the file.
27 * In the case of system.posix_acl_access and system.posix_acl_default, since
28 * these are special cases for filesystem ACLs, they are interpreted by the
29 * kernel, in addition, they are negatively and positively cached and attached
30 * to the inode so that unnecessary lookups are avoided.
32 * Locking works like so:
33 * Directory components (xattr root, xattr dir) are protectd by their i_mutex.
34 * The xattrs themselves are protected by the xattr_sem.
38 #include <linux/capability.h>
39 #include <linux/dcache.h>
40 #include <linux/namei.h>
41 #include <linux/errno.h>
42 #include <linux/gfp.h>
44 #include <linux/file.h>
45 #include <linux/pagemap.h>
46 #include <linux/xattr.h>
49 #include <linux/uaccess.h>
50 #include <net/checksum.h>
51 #include <linux/stat.h>
52 #include <linux/quotaops.h>
53 #include <linux/security.h>
54 #include <linux/posix_acl_xattr.h>
55 #include <linux/xattr.h>
57 #define PRIVROOT_NAME ".reiserfs_priv"
58 #define XAROOT_NAME "xattrs"
62 * Helpers for inode ops. We do this so that we don't have all the VFS
63 * overhead and also for proper i_mutex annotation.
64 * dir->i_mutex must be held for all of them.
66 #ifdef CONFIG_REISERFS_FS_XATTR
67 static int xattr_create(struct inode *dir, struct dentry *dentry, int mode)
69 BUG_ON(!inode_is_locked(dir));
70 return dir->i_op->create(&nop_mnt_idmap, dir, dentry, mode, true);
74 static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
76 BUG_ON(!inode_is_locked(dir));
77 return dir->i_op->mkdir(&nop_mnt_idmap, dir, dentry, mode);
81 * We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr
82 * mutation ops aren't called during rename or splace, which are the
83 * only other users of I_MUTEX_CHILD. It violates the ordering, but that's
84 * better than allocating another subclass just for this code.
86 static int xattr_unlink(struct inode *dir, struct dentry *dentry)
90 BUG_ON(!inode_is_locked(dir));
92 inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD);
93 error = dir->i_op->unlink(dir, dentry);
94 inode_unlock(d_inode(dentry));
101 static int xattr_rmdir(struct inode *dir, struct dentry *dentry)
105 BUG_ON(!inode_is_locked(dir));
107 inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD);
108 error = dir->i_op->rmdir(dir, dentry);
110 d_inode(dentry)->i_flags |= S_DEAD;
111 inode_unlock(d_inode(dentry));
118 #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE)
120 static struct dentry *open_xa_root(struct super_block *sb, int flags)
122 struct dentry *privroot = REISERFS_SB(sb)->priv_root;
123 struct dentry *xaroot;
125 if (d_really_is_negative(privroot))
126 return ERR_PTR(-EOPNOTSUPP);
128 inode_lock_nested(d_inode(privroot), I_MUTEX_XATTR);
130 xaroot = dget(REISERFS_SB(sb)->xattr_root);
132 xaroot = ERR_PTR(-EOPNOTSUPP);
133 else if (d_really_is_negative(xaroot)) {
136 if (xattr_may_create(flags))
137 err = xattr_mkdir(d_inode(privroot), xaroot, 0700);
140 xaroot = ERR_PTR(err);
144 inode_unlock(d_inode(privroot));
148 static struct dentry *open_xa_dir(const struct inode *inode, int flags)
150 struct dentry *xaroot, *xadir;
153 xaroot = open_xa_root(inode->i_sb, flags);
157 snprintf(namebuf, sizeof(namebuf), "%X.%X",
158 le32_to_cpu(INODE_PKEY(inode)->k_objectid),
159 inode->i_generation);
161 inode_lock_nested(d_inode(xaroot), I_MUTEX_XATTR);
163 xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf));
164 if (!IS_ERR(xadir) && d_really_is_negative(xadir)) {
167 if (xattr_may_create(flags))
168 err = xattr_mkdir(d_inode(xaroot), xadir, 0700);
171 xadir = ERR_PTR(err);
175 inode_unlock(d_inode(xaroot));
181 * The following are side effects of other operations that aren't explicitly
182 * modifying extended attributes. This includes operations such as permissions
183 * or ownership changes, object deletions, etc.
185 struct reiserfs_dentry_buf {
186 struct dir_context ctx;
187 struct dentry *xadir;
190 struct dentry *dentries[8];
194 fill_with_dentries(struct dir_context *ctx, const char *name, int namelen,
195 loff_t offset, u64 ino, unsigned int d_type)
197 struct reiserfs_dentry_buf *dbuf =
198 container_of(ctx, struct reiserfs_dentry_buf, ctx);
199 struct dentry *dentry;
201 WARN_ON_ONCE(!inode_is_locked(d_inode(dbuf->xadir)));
203 if (dbuf->count == ARRAY_SIZE(dbuf->dentries))
206 if (name[0] == '.' && (namelen < 2 ||
207 (namelen == 2 && name[1] == '.')))
210 dentry = lookup_one_len(name, dbuf->xadir, namelen);
211 if (IS_ERR(dentry)) {
212 dbuf->err = PTR_ERR(dentry);
214 } else if (d_really_is_negative(dentry)) {
215 /* A directory entry exists, but no file? */
216 reiserfs_error(dentry->d_sb, "xattr-20003",
217 "Corrupted directory: xattr %pd listed but "
218 "not found for file %pd.\n",
219 dentry, dbuf->xadir);
225 dbuf->dentries[dbuf->count++] = dentry;
230 cleanup_dentry_buf(struct reiserfs_dentry_buf *buf)
234 for (i = 0; i < buf->count; i++)
235 if (buf->dentries[i])
236 dput(buf->dentries[i]);
239 static int reiserfs_for_each_xattr(struct inode *inode,
240 int (*action)(struct dentry *, void *),
245 struct reiserfs_dentry_buf buf = {
246 .ctx.actor = fill_with_dentries,
249 /* Skip out, an xattr has no xattrs associated with it */
250 if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1)
253 dir = open_xa_dir(inode, XATTR_REPLACE);
257 } else if (d_really_is_negative(dir)) {
262 inode_lock_nested(d_inode(dir), I_MUTEX_XATTR);
266 err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx);
275 for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) {
276 struct dentry *dentry = buf.dentries[i];
278 if (!d_is_dir(dentry))
279 err = action(dentry, data);
282 buf.dentries[i] = NULL;
288 inode_unlock(d_inode(dir));
290 cleanup_dentry_buf(&buf);
294 * We start a transaction here to avoid a ABBA situation
295 * between the xattr root's i_mutex and the journal lock.
296 * This doesn't incur much additional overhead since the
297 * new transaction will just nest inside the
300 int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 +
301 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
302 struct reiserfs_transaction_handle th;
304 reiserfs_write_lock(inode->i_sb);
305 err = journal_begin(&th, inode->i_sb, blocks);
306 reiserfs_write_unlock(inode->i_sb);
310 inode_lock_nested(d_inode(dir->d_parent),
312 err = action(dir, data);
313 reiserfs_write_lock(inode->i_sb);
314 jerror = journal_end(&th);
315 reiserfs_write_unlock(inode->i_sb);
316 inode_unlock(d_inode(dir->d_parent));
324 * -ENODATA: this object doesn't have any xattrs
325 * -EOPNOTSUPP: this file system doesn't have xattrs enabled on disk.
328 if (err == -ENODATA || err == -EOPNOTSUPP)
333 static int delete_one_xattr(struct dentry *dentry, void *data)
335 struct inode *dir = d_inode(dentry->d_parent);
337 /* This is the xattr dir, handle specially. */
338 if (d_is_dir(dentry))
339 return xattr_rmdir(dir, dentry);
341 return xattr_unlink(dir, dentry);
344 static int chown_one_xattr(struct dentry *dentry, void *data)
346 struct iattr *attrs = data;
347 int ia_valid = attrs->ia_valid;
351 * We only want the ownership bits. Otherwise, we'll do
352 * things like change a directory to a regular file if
355 attrs->ia_valid &= (ATTR_UID|ATTR_GID);
356 err = reiserfs_setattr(&nop_mnt_idmap, dentry, attrs);
357 attrs->ia_valid = ia_valid;
362 /* No i_mutex, but the inode is unconnected. */
363 int reiserfs_delete_xattrs(struct inode *inode)
365 int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL);
368 reiserfs_warning(inode->i_sb, "jdm-20004",
369 "Couldn't delete all xattrs (%d)\n", err);
373 /* inode->i_mutex: down */
374 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs)
376 int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs);
379 reiserfs_warning(inode->i_sb, "jdm-20007",
380 "Couldn't chown all xattrs (%d)\n", err);
384 #ifdef CONFIG_REISERFS_FS_XATTR
386 * Returns a dentry corresponding to a specific extended attribute file
387 * for the inode. If flags allow, the file is created. Otherwise, a
388 * valid or negative dentry, or an error is returned.
390 static struct dentry *xattr_lookup(struct inode *inode, const char *name,
393 struct dentry *xadir, *xafile;
396 xadir = open_xa_dir(inode, flags);
398 return ERR_CAST(xadir);
400 inode_lock_nested(d_inode(xadir), I_MUTEX_XATTR);
401 xafile = lookup_one_len(name, xadir, strlen(name));
402 if (IS_ERR(xafile)) {
403 err = PTR_ERR(xafile);
407 if (d_really_is_positive(xafile) && (flags & XATTR_CREATE))
410 if (d_really_is_negative(xafile)) {
412 if (xattr_may_create(flags))
413 err = xattr_create(d_inode(xadir), xafile,
420 inode_unlock(d_inode(xadir));
427 /* Internal operations on file data */
428 static inline void reiserfs_put_page(struct page *page)
434 static struct page *reiserfs_get_page(struct inode *dir, size_t n)
436 struct address_space *mapping = dir->i_mapping;
439 * We can deadlock if we try to free dentries,
440 * and an unlink/rmdir has just occurred - GFP_NOFS avoids this
442 mapping_set_gfp_mask(mapping, GFP_NOFS);
443 page = read_mapping_page(mapping, n >> PAGE_SHIFT, NULL);
449 static inline __u32 xattr_hash(const char *msg, int len)
452 * csum_partial() gives different results for little-endian and
453 * big endian hosts. Images created on little-endian hosts and
454 * mounted on big-endian hosts(and vice versa) will see csum mismatches
455 * when trying to fetch xattrs. Treating the hash as __wsum_t would
456 * lower the frequency of mismatch. This is an endianness bug in
457 * reiserfs. The return statement would result in a sparse warning. Do
458 * not fix the sparse warning so as to not hide a reminder of the bug.
460 return csum_partial(msg, len, 0);
463 int reiserfs_commit_write(struct file *f, struct page *page,
464 unsigned from, unsigned to);
466 static void update_ctime(struct inode *inode)
468 struct timespec64 now = current_time(inode);
470 if (inode_unhashed(inode) || !inode->i_nlink ||
471 timespec64_equal(&inode->i_ctime, &now))
474 inode->i_ctime = current_time(inode);
475 mark_inode_dirty(inode);
478 static int lookup_and_delete_xattr(struct inode *inode, const char *name)
481 struct dentry *dentry, *xadir;
483 xadir = open_xa_dir(inode, XATTR_REPLACE);
485 return PTR_ERR(xadir);
487 inode_lock_nested(d_inode(xadir), I_MUTEX_XATTR);
488 dentry = lookup_one_len(name, xadir, strlen(name));
489 if (IS_ERR(dentry)) {
490 err = PTR_ERR(dentry);
494 if (d_really_is_positive(dentry)) {
495 err = xattr_unlink(d_inode(xadir), dentry);
501 inode_unlock(d_inode(xadir));
507 /* Generic extended attribute operations that can be used by xa plugins */
510 * inode->i_mutex: down
513 reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th,
514 struct inode *inode, const char *name,
515 const void *buffer, size_t buffer_size, int flags)
518 struct dentry *dentry;
522 size_t buffer_pos = 0;
526 if (get_inode_sd_version(inode) == STAT_DATA_V1)
530 err = lookup_and_delete_xattr(inode, name);
534 dentry = xattr_lookup(inode, name, flags);
536 return PTR_ERR(dentry);
538 down_write(&REISERFS_I(inode)->i_xattr_sem);
540 xahash = xattr_hash(buffer, buffer_size);
541 while (buffer_pos < buffer_size || buffer_pos == 0) {
544 size_t page_offset = (file_pos & (PAGE_SIZE - 1));
546 if (buffer_size - buffer_pos > PAGE_SIZE)
549 chunk = buffer_size - buffer_pos;
551 page = reiserfs_get_page(d_inode(dentry), file_pos);
558 data = page_address(page);
561 struct reiserfs_xattr_header *rxh;
563 skip = file_pos = sizeof(struct reiserfs_xattr_header);
564 if (chunk + skip > PAGE_SIZE)
565 chunk = PAGE_SIZE - skip;
566 rxh = (struct reiserfs_xattr_header *)data;
567 rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC);
568 rxh->h_hash = cpu_to_le32(xahash);
571 reiserfs_write_lock(inode->i_sb);
572 err = __reiserfs_write_begin(page, page_offset, chunk + skip);
575 memcpy(data + skip, buffer + buffer_pos, chunk);
576 err = reiserfs_commit_write(NULL, page, page_offset,
577 page_offset + chunk +
580 reiserfs_write_unlock(inode->i_sb);
582 reiserfs_put_page(page);
586 if (err || buffer_size == 0 || !buffer)
590 new_size = buffer_size + sizeof(struct reiserfs_xattr_header);
591 if (!err && new_size < i_size_read(d_inode(dentry))) {
592 struct iattr newattrs = {
593 .ia_ctime = current_time(inode),
595 .ia_valid = ATTR_SIZE | ATTR_CTIME,
598 inode_lock_nested(d_inode(dentry), I_MUTEX_XATTR);
599 inode_dio_wait(d_inode(dentry));
601 err = reiserfs_setattr(&nop_mnt_idmap, dentry, &newattrs);
602 inode_unlock(d_inode(dentry));
606 up_write(&REISERFS_I(inode)->i_xattr_sem);
611 /* We need to start a transaction to maintain lock ordering */
612 int reiserfs_xattr_set(struct inode *inode, const char *name,
613 const void *buffer, size_t buffer_size, int flags)
616 struct reiserfs_transaction_handle th;
618 size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size);
620 /* Check before we start a transaction and then do nothing. */
621 if (!d_really_is_positive(REISERFS_SB(inode->i_sb)->priv_root))
624 if (!(flags & XATTR_REPLACE))
625 jbegin_count += reiserfs_xattr_jcreate_nblocks(inode);
627 reiserfs_write_lock(inode->i_sb);
628 error = journal_begin(&th, inode->i_sb, jbegin_count);
629 reiserfs_write_unlock(inode->i_sb);
634 error = reiserfs_xattr_set_handle(&th, inode, name,
635 buffer, buffer_size, flags);
637 reiserfs_write_lock(inode->i_sb);
638 error2 = journal_end(&th);
639 reiserfs_write_unlock(inode->i_sb);
647 * inode->i_mutex: down
650 reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
654 struct dentry *dentry;
657 size_t buffer_pos = 0;
665 * We can't have xattrs attached to v1 items since they don't have
668 if (get_inode_sd_version(inode) == STAT_DATA_V1)
672 * priv_root needn't be initialized during mount so allow initial
673 * lookups to succeed.
675 if (!REISERFS_SB(inode->i_sb)->priv_root)
678 dentry = xattr_lookup(inode, name, XATTR_REPLACE);
679 if (IS_ERR(dentry)) {
680 err = PTR_ERR(dentry);
684 down_read(&REISERFS_I(inode)->i_xattr_sem);
686 isize = i_size_read(d_inode(dentry));
688 /* Just return the size needed */
689 if (buffer == NULL) {
690 err = isize - sizeof(struct reiserfs_xattr_header);
694 if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) {
699 while (file_pos < isize) {
704 if (isize - file_pos > PAGE_SIZE)
707 chunk = isize - file_pos;
709 page = reiserfs_get_page(d_inode(dentry), file_pos);
716 data = page_address(page);
718 struct reiserfs_xattr_header *rxh =
719 (struct reiserfs_xattr_header *)data;
720 skip = file_pos = sizeof(struct reiserfs_xattr_header);
722 /* Magic doesn't match up.. */
723 if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) {
725 reiserfs_put_page(page);
726 reiserfs_warning(inode->i_sb, "jdm-20001",
727 "Invalid magic for xattr (%s) "
728 "associated with %k", name,
733 hash = le32_to_cpu(rxh->h_hash);
735 memcpy(buffer + buffer_pos, data + skip, chunk);
737 reiserfs_put_page(page);
742 err = isize - sizeof(struct reiserfs_xattr_header);
744 if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) !=
746 reiserfs_warning(inode->i_sb, "jdm-20002",
747 "Invalid hash for xattr (%s) associated "
748 "with %k", name, INODE_PKEY(inode));
753 up_read(&REISERFS_I(inode)->i_xattr_sem);
761 * In order to implement different sets of xattr operations for each xattr
762 * prefix with the generic xattr API, a filesystem should create a
763 * null-terminated array of struct xattr_handler (one for each prefix) and
764 * hang a pointer to it off of the s_xattr field of the superblock.
766 * The generic_fooxattr() functions will use this list to dispatch xattr
767 * operations to the correct xattr_handler.
769 #define for_each_xattr_handler(handlers, handler) \
770 for ((handler) = *(handlers)++; \
772 (handler) = *(handlers)++)
774 static inline bool reiserfs_posix_acl_list(const char *name,
775 struct dentry *dentry)
777 return (posix_acl_type(name) >= 0) &&
778 IS_POSIXACL(d_backing_inode(dentry));
781 /* This is the implementation for the xattr plugin infrastructure */
782 static inline bool reiserfs_xattr_list(const struct xattr_handler **handlers,
783 const char *name, struct dentry *dentry)
786 const struct xattr_handler *xah = NULL;
788 for_each_xattr_handler(handlers, xah) {
789 const char *prefix = xattr_prefix(xah);
791 if (strncmp(prefix, name, strlen(prefix)))
794 if (!xattr_handler_can_list(xah, dentry))
801 return reiserfs_posix_acl_list(name, dentry);
804 struct listxattr_buf {
805 struct dir_context ctx;
809 struct dentry *dentry;
812 static bool listxattr_filler(struct dir_context *ctx, const char *name,
813 int namelen, loff_t offset, u64 ino,
816 struct listxattr_buf *b =
817 container_of(ctx, struct listxattr_buf, ctx);
820 if (name[0] != '.' ||
821 (namelen != 1 && (name[1] != '.' || namelen != 2))) {
822 if (!reiserfs_xattr_list(b->dentry->d_sb->s_xattr, name,
827 if (b->pos + size > b->size) {
831 memcpy(b->buf + b->pos, name, namelen);
832 b->buf[b->pos + namelen] = 0;
840 * Inode operation listxattr()
842 * We totally ignore the generic listxattr here because it would be stupid
843 * not to. Since the xattrs are organized in a directory, we can just
844 * readdir to find them.
846 ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
850 struct listxattr_buf buf = {
851 .ctx.actor = listxattr_filler,
854 .size = buffer ? size : 0,
857 if (d_really_is_negative(dentry))
860 if (get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1)
863 dir = open_xa_dir(d_inode(dentry), XATTR_REPLACE);
867 err = 0; /* Not an error if there aren't any xattrs */
871 inode_lock_nested(d_inode(dir), I_MUTEX_XATTR);
872 err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx);
873 inode_unlock(d_inode(dir));
883 static int create_privroot(struct dentry *dentry)
886 struct inode *inode = d_inode(dentry->d_parent);
888 WARN_ON_ONCE(!inode_is_locked(inode));
890 err = xattr_mkdir(inode, dentry, 0700);
891 if (err || d_really_is_negative(dentry)) {
892 reiserfs_warning(dentry->d_sb, "jdm-20006",
893 "xattrs/ACLs enabled and couldn't "
894 "find/create .reiserfs_priv. "
899 reiserfs_init_priv_inode(d_inode(dentry));
900 reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr "
901 "storage.\n", PRIVROOT_NAME);
907 int __init reiserfs_xattr_register_handlers(void) { return 0; }
908 void reiserfs_xattr_unregister_handlers(void) {}
909 static int create_privroot(struct dentry *dentry) { return 0; }
912 /* Actual operations that are exported to VFS-land */
913 const struct xattr_handler *reiserfs_xattr_handlers[] = {
914 #ifdef CONFIG_REISERFS_FS_XATTR
915 &reiserfs_xattr_user_handler,
916 &reiserfs_xattr_trusted_handler,
918 #ifdef CONFIG_REISERFS_FS_SECURITY
919 &reiserfs_xattr_security_handler,
924 static int xattr_mount_check(struct super_block *s)
927 * We need generation numbers to ensure that the oid mapping is correct
928 * v3.5 filesystems don't have them.
930 if (old_format_only(s)) {
931 if (reiserfs_xattrs_optional(s)) {
933 * Old format filesystem, but optional xattrs have
934 * been enabled. Error out.
936 reiserfs_warning(s, "jdm-2005",
937 "xattrs/ACLs not supported "
938 "on pre-v3.6 format filesystems. "
947 int reiserfs_permission(struct mnt_idmap *idmap, struct inode *inode,
951 * We don't do permission checks on the internal objects.
952 * Permissions are determined by the "owning" object.
954 if (IS_PRIVATE(inode))
957 return generic_permission(&nop_mnt_idmap, inode, mask);
960 static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags)
965 static const struct dentry_operations xattr_lookup_poison_ops = {
966 .d_revalidate = xattr_hide_revalidate,
969 int reiserfs_lookup_privroot(struct super_block *s)
971 struct dentry *dentry;
974 /* If we don't have the privroot located yet - go find it */
975 inode_lock(d_inode(s->s_root));
976 dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
977 strlen(PRIVROOT_NAME));
978 if (!IS_ERR(dentry)) {
979 REISERFS_SB(s)->priv_root = dentry;
980 d_set_d_op(dentry, &xattr_lookup_poison_ops);
981 if (d_really_is_positive(dentry))
982 reiserfs_init_priv_inode(d_inode(dentry));
984 err = PTR_ERR(dentry);
985 inode_unlock(d_inode(s->s_root));
991 * We need to take a copy of the mount flags since things like
992 * SB_RDONLY don't get set until *after* we're called.
993 * mount_flags != mount_options
995 int reiserfs_xattr_init(struct super_block *s, int mount_flags)
998 struct dentry *privroot = REISERFS_SB(s)->priv_root;
1000 err = xattr_mount_check(s);
1004 if (d_really_is_negative(privroot) && !(mount_flags & SB_RDONLY)) {
1005 inode_lock(d_inode(s->s_root));
1006 err = create_privroot(REISERFS_SB(s)->priv_root);
1007 inode_unlock(d_inode(s->s_root));
1010 if (d_really_is_positive(privroot)) {
1011 inode_lock(d_inode(privroot));
1012 if (!REISERFS_SB(s)->xattr_root) {
1013 struct dentry *dentry;
1015 dentry = lookup_one_len(XAROOT_NAME, privroot,
1016 strlen(XAROOT_NAME));
1017 if (!IS_ERR(dentry))
1018 REISERFS_SB(s)->xattr_root = dentry;
1020 err = PTR_ERR(dentry);
1022 inode_unlock(d_inode(privroot));
1027 clear_bit(REISERFS_XATTRS_USER, &REISERFS_SB(s)->s_mount_opt);
1028 clear_bit(REISERFS_POSIXACL, &REISERFS_SB(s)->s_mount_opt);
1031 /* The super_block SB_POSIXACL must mirror the (no)acl mount option. */
1032 if (reiserfs_posixacl(s))
1033 s->s_flags |= SB_POSIXACL;
1035 s->s_flags &= ~SB_POSIXACL;