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(!mutex_is_locked(&dir->i_mutex));
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(!mutex_is_locked(&dir->i_mutex));
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(!mutex_is_locked(&dir->i_mutex));
90 mutex_lock_nested(&d_inode(dentry)->i_mutex, I_MUTEX_CHILD);
91 error = dir->i_op->unlink(dir, dentry);
92 mutex_unlock(&d_inode(dentry)->i_mutex);
99 static int xattr_rmdir(struct inode *dir, struct dentry *dentry)
103 BUG_ON(!mutex_is_locked(&dir->i_mutex));
105 mutex_lock_nested(&d_inode(dentry)->i_mutex, I_MUTEX_CHILD);
106 error = dir->i_op->rmdir(dir, dentry);
108 d_inode(dentry)->i_flags |= S_DEAD;
109 mutex_unlock(&d_inode(dentry)->i_mutex);
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(-ENODATA);
126 mutex_lock_nested(&d_inode(privroot)->i_mutex, I_MUTEX_XATTR);
128 xaroot = dget(REISERFS_SB(sb)->xattr_root);
130 xaroot = ERR_PTR(-ENODATA);
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 mutex_unlock(&d_inode(privroot)->i_mutex);
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 mutex_lock_nested(&d_inode(xaroot)->i_mutex, 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 mutex_unlock(&d_inode(xaroot)->i_mutex);
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(!mutex_is_locked(&d_inode(dbuf->xadir)->i_mutex));
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 mutex_lock_nested(&d_inode(dir)->i_mutex, 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 mutex_unlock(&d_inode(dir)->i_mutex);
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 mutex_lock_nested(&d_inode(dir->d_parent)->i_mutex,
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 mutex_unlock(&d_inode(dir->d_parent)->i_mutex);
321 /* -ENODATA isn't an error */
327 static int delete_one_xattr(struct dentry *dentry, void *data)
329 struct inode *dir = d_inode(dentry->d_parent);
331 /* This is the xattr dir, handle specially. */
332 if (d_is_dir(dentry))
333 return xattr_rmdir(dir, dentry);
335 return xattr_unlink(dir, dentry);
338 static int chown_one_xattr(struct dentry *dentry, void *data)
340 struct iattr *attrs = data;
341 int ia_valid = attrs->ia_valid;
345 * We only want the ownership bits. Otherwise, we'll do
346 * things like change a directory to a regular file if
349 attrs->ia_valid &= (ATTR_UID|ATTR_GID);
350 err = reiserfs_setattr(dentry, attrs);
351 attrs->ia_valid = ia_valid;
356 /* No i_mutex, but the inode is unconnected. */
357 int reiserfs_delete_xattrs(struct inode *inode)
359 int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL);
362 reiserfs_warning(inode->i_sb, "jdm-20004",
363 "Couldn't delete all xattrs (%d)\n", err);
367 /* inode->i_mutex: down */
368 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs)
370 int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs);
373 reiserfs_warning(inode->i_sb, "jdm-20007",
374 "Couldn't chown all xattrs (%d)\n", err);
378 #ifdef CONFIG_REISERFS_FS_XATTR
380 * Returns a dentry corresponding to a specific extended attribute file
381 * for the inode. If flags allow, the file is created. Otherwise, a
382 * valid or negative dentry, or an error is returned.
384 static struct dentry *xattr_lookup(struct inode *inode, const char *name,
387 struct dentry *xadir, *xafile;
390 xadir = open_xa_dir(inode, flags);
392 return ERR_CAST(xadir);
394 mutex_lock_nested(&d_inode(xadir)->i_mutex, I_MUTEX_XATTR);
395 xafile = lookup_one_len(name, xadir, strlen(name));
396 if (IS_ERR(xafile)) {
397 err = PTR_ERR(xafile);
401 if (d_really_is_positive(xafile) && (flags & XATTR_CREATE))
404 if (d_really_is_negative(xafile)) {
406 if (xattr_may_create(flags))
407 err = xattr_create(d_inode(xadir), xafile,
414 mutex_unlock(&d_inode(xadir)->i_mutex);
421 /* Internal operations on file data */
422 static inline void reiserfs_put_page(struct page *page)
425 page_cache_release(page);
428 static struct page *reiserfs_get_page(struct inode *dir, size_t n)
430 struct address_space *mapping = dir->i_mapping;
433 * We can deadlock if we try to free dentries,
434 * and an unlink/rmdir has just occurred - GFP_NOFS avoids this
436 mapping_set_gfp_mask(mapping, GFP_NOFS);
437 page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL);
446 reiserfs_put_page(page);
447 return ERR_PTR(-EIO);
450 static inline __u32 xattr_hash(const char *msg, int len)
452 return csum_partial(msg, len, 0);
455 int reiserfs_commit_write(struct file *f, struct page *page,
456 unsigned from, unsigned to);
458 static void update_ctime(struct inode *inode)
460 struct timespec now = current_fs_time(inode->i_sb);
462 if (inode_unhashed(inode) || !inode->i_nlink ||
463 timespec_equal(&inode->i_ctime, &now))
466 inode->i_ctime = CURRENT_TIME_SEC;
467 mark_inode_dirty(inode);
470 static int lookup_and_delete_xattr(struct inode *inode, const char *name)
473 struct dentry *dentry, *xadir;
475 xadir = open_xa_dir(inode, XATTR_REPLACE);
477 return PTR_ERR(xadir);
479 mutex_lock_nested(&d_inode(xadir)->i_mutex, I_MUTEX_XATTR);
480 dentry = lookup_one_len(name, xadir, strlen(name));
481 if (IS_ERR(dentry)) {
482 err = PTR_ERR(dentry);
486 if (d_really_is_positive(dentry)) {
487 err = xattr_unlink(d_inode(xadir), dentry);
493 mutex_unlock(&d_inode(xadir)->i_mutex);
499 /* Generic extended attribute operations that can be used by xa plugins */
502 * inode->i_mutex: down
505 reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th,
506 struct inode *inode, const char *name,
507 const void *buffer, size_t buffer_size, int flags)
510 struct dentry *dentry;
514 size_t buffer_pos = 0;
518 if (get_inode_sd_version(inode) == STAT_DATA_V1)
522 err = lookup_and_delete_xattr(inode, name);
526 dentry = xattr_lookup(inode, name, flags);
528 return PTR_ERR(dentry);
530 down_write(&REISERFS_I(inode)->i_xattr_sem);
532 xahash = xattr_hash(buffer, buffer_size);
533 while (buffer_pos < buffer_size || buffer_pos == 0) {
536 size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1));
538 if (buffer_size - buffer_pos > PAGE_CACHE_SIZE)
539 chunk = PAGE_CACHE_SIZE;
541 chunk = buffer_size - buffer_pos;
543 page = reiserfs_get_page(d_inode(dentry), file_pos);
550 data = page_address(page);
553 struct reiserfs_xattr_header *rxh;
555 skip = file_pos = sizeof(struct reiserfs_xattr_header);
556 if (chunk + skip > PAGE_CACHE_SIZE)
557 chunk = PAGE_CACHE_SIZE - skip;
558 rxh = (struct reiserfs_xattr_header *)data;
559 rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC);
560 rxh->h_hash = cpu_to_le32(xahash);
563 reiserfs_write_lock(inode->i_sb);
564 err = __reiserfs_write_begin(page, page_offset, chunk + skip);
567 memcpy(data + skip, buffer + buffer_pos, chunk);
568 err = reiserfs_commit_write(NULL, page, page_offset,
569 page_offset + chunk +
572 reiserfs_write_unlock(inode->i_sb);
574 reiserfs_put_page(page);
578 if (err || buffer_size == 0 || !buffer)
582 new_size = buffer_size + sizeof(struct reiserfs_xattr_header);
583 if (!err && new_size < i_size_read(d_inode(dentry))) {
584 struct iattr newattrs = {
585 .ia_ctime = current_fs_time(inode->i_sb),
587 .ia_valid = ATTR_SIZE | ATTR_CTIME,
590 mutex_lock_nested(&d_inode(dentry)->i_mutex, I_MUTEX_XATTR);
591 inode_dio_wait(d_inode(dentry));
593 err = reiserfs_setattr(dentry, &newattrs);
594 mutex_unlock(&d_inode(dentry)->i_mutex);
598 up_write(&REISERFS_I(inode)->i_xattr_sem);
603 /* We need to start a transaction to maintain lock ordering */
604 int reiserfs_xattr_set(struct inode *inode, const char *name,
605 const void *buffer, size_t buffer_size, int flags)
608 struct reiserfs_transaction_handle th;
610 size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size);
612 if (!(flags & XATTR_REPLACE))
613 jbegin_count += reiserfs_xattr_jcreate_nblocks(inode);
615 reiserfs_write_lock(inode->i_sb);
616 error = journal_begin(&th, inode->i_sb, jbegin_count);
617 reiserfs_write_unlock(inode->i_sb);
622 error = reiserfs_xattr_set_handle(&th, inode, name,
623 buffer, buffer_size, flags);
625 reiserfs_write_lock(inode->i_sb);
626 error2 = journal_end(&th);
627 reiserfs_write_unlock(inode->i_sb);
635 * inode->i_mutex: down
638 reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
642 struct dentry *dentry;
645 size_t buffer_pos = 0;
653 * We can't have xattrs attached to v1 items since they don't have
656 if (get_inode_sd_version(inode) == STAT_DATA_V1)
660 * priv_root needn't be initialized during mount so allow initial
661 * lookups to succeed.
663 if (!REISERFS_SB(inode->i_sb)->priv_root)
666 dentry = xattr_lookup(inode, name, XATTR_REPLACE);
667 if (IS_ERR(dentry)) {
668 err = PTR_ERR(dentry);
672 down_read(&REISERFS_I(inode)->i_xattr_sem);
674 isize = i_size_read(d_inode(dentry));
676 /* Just return the size needed */
677 if (buffer == NULL) {
678 err = isize - sizeof(struct reiserfs_xattr_header);
682 if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) {
687 while (file_pos < isize) {
692 if (isize - file_pos > PAGE_CACHE_SIZE)
693 chunk = PAGE_CACHE_SIZE;
695 chunk = isize - file_pos;
697 page = reiserfs_get_page(d_inode(dentry), file_pos);
704 data = page_address(page);
706 struct reiserfs_xattr_header *rxh =
707 (struct reiserfs_xattr_header *)data;
708 skip = file_pos = sizeof(struct reiserfs_xattr_header);
710 /* Magic doesn't match up.. */
711 if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) {
713 reiserfs_put_page(page);
714 reiserfs_warning(inode->i_sb, "jdm-20001",
715 "Invalid magic for xattr (%s) "
716 "associated with %k", name,
721 hash = le32_to_cpu(rxh->h_hash);
723 memcpy(buffer + buffer_pos, data + skip, chunk);
725 reiserfs_put_page(page);
730 err = isize - sizeof(struct reiserfs_xattr_header);
732 if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) !=
734 reiserfs_warning(inode->i_sb, "jdm-20002",
735 "Invalid hash for xattr (%s) associated "
736 "with %k", name, INODE_PKEY(inode));
741 up_read(&REISERFS_I(inode)->i_xattr_sem);
749 * In order to implement different sets of xattr operations for each xattr
750 * prefix with the generic xattr API, a filesystem should create a
751 * null-terminated array of struct xattr_handler (one for each prefix) and
752 * hang a pointer to it off of the s_xattr field of the superblock.
754 * The generic_fooxattr() functions will use this list to dispatch xattr
755 * operations to the correct xattr_handler.
757 #define for_each_xattr_handler(handlers, handler) \
758 for ((handler) = *(handlers)++; \
760 (handler) = *(handlers)++)
762 /* This is the implementation for the xattr plugin infrastructure */
763 static inline const struct xattr_handler *
764 find_xattr_handler_prefix(const struct xattr_handler **handlers,
767 const struct xattr_handler *xah;
772 for_each_xattr_handler(handlers, xah) {
773 if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0)
780 struct listxattr_buf {
781 struct dir_context ctx;
785 struct dentry *dentry;
788 static int listxattr_filler(struct dir_context *ctx, const char *name,
789 int namelen, loff_t offset, u64 ino,
792 struct listxattr_buf *b =
793 container_of(ctx, struct listxattr_buf, ctx);
796 if (name[0] != '.' ||
797 (namelen != 1 && (name[1] != '.' || namelen != 2))) {
798 const struct xattr_handler *handler;
800 handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr,
802 if (!handler) /* Unsupported xattr name */
805 size = handler->list(handler, b->dentry,
806 b->buf + b->pos, b->size, name,
808 if (b->pos + size > b->size) {
813 size = handler->list(handler, b->dentry,
814 NULL, 0, name, namelen);
823 * Inode operation listxattr()
825 * We totally ignore the generic listxattr here because it would be stupid
826 * not to. Since the xattrs are organized in a directory, we can just
827 * readdir to find them.
829 ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
833 struct listxattr_buf buf = {
834 .ctx.actor = listxattr_filler,
837 .size = buffer ? size : 0,
840 if (d_really_is_negative(dentry))
843 if (!dentry->d_sb->s_xattr ||
844 get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1)
847 dir = open_xa_dir(d_inode(dentry), XATTR_REPLACE);
851 err = 0; /* Not an error if there aren't any xattrs */
855 mutex_lock_nested(&d_inode(dir)->i_mutex, I_MUTEX_XATTR);
856 err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx);
857 mutex_unlock(&d_inode(dir)->i_mutex);
867 static int create_privroot(struct dentry *dentry)
870 struct inode *inode = d_inode(dentry->d_parent);
872 WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
874 err = xattr_mkdir(inode, dentry, 0700);
875 if (err || d_really_is_negative(dentry)) {
876 reiserfs_warning(dentry->d_sb, "jdm-20006",
877 "xattrs/ACLs enabled and couldn't "
878 "find/create .reiserfs_priv. "
883 d_inode(dentry)->i_flags |= S_PRIVATE;
884 reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr "
885 "storage.\n", PRIVROOT_NAME);
891 int __init reiserfs_xattr_register_handlers(void) { return 0; }
892 void reiserfs_xattr_unregister_handlers(void) {}
893 static int create_privroot(struct dentry *dentry) { return 0; }
896 /* Actual operations that are exported to VFS-land */
897 static const struct xattr_handler *reiserfs_xattr_handlers[] = {
898 #ifdef CONFIG_REISERFS_FS_XATTR
899 &reiserfs_xattr_user_handler,
900 &reiserfs_xattr_trusted_handler,
902 #ifdef CONFIG_REISERFS_FS_SECURITY
903 &reiserfs_xattr_security_handler,
905 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
906 &posix_acl_access_xattr_handler,
907 &posix_acl_default_xattr_handler,
912 static int xattr_mount_check(struct super_block *s)
915 * We need generation numbers to ensure that the oid mapping is correct
916 * v3.5 filesystems don't have them.
918 if (old_format_only(s)) {
919 if (reiserfs_xattrs_optional(s)) {
921 * Old format filesystem, but optional xattrs have
922 * been enabled. Error out.
924 reiserfs_warning(s, "jdm-2005",
925 "xattrs/ACLs not supported "
926 "on pre-v3.6 format filesystems. "
935 int reiserfs_permission(struct inode *inode, int mask)
938 * We don't do permission checks on the internal objects.
939 * Permissions are determined by the "owning" object.
941 if (IS_PRIVATE(inode))
944 return generic_permission(inode, mask);
947 static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags)
952 static const struct dentry_operations xattr_lookup_poison_ops = {
953 .d_revalidate = xattr_hide_revalidate,
956 int reiserfs_lookup_privroot(struct super_block *s)
958 struct dentry *dentry;
961 /* If we don't have the privroot located yet - go find it */
962 mutex_lock(&d_inode(s->s_root)->i_mutex);
963 dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
964 strlen(PRIVROOT_NAME));
965 if (!IS_ERR(dentry)) {
966 REISERFS_SB(s)->priv_root = dentry;
967 d_set_d_op(dentry, &xattr_lookup_poison_ops);
968 if (d_really_is_positive(dentry))
969 d_inode(dentry)->i_flags |= S_PRIVATE;
971 err = PTR_ERR(dentry);
972 mutex_unlock(&d_inode(s->s_root)->i_mutex);
978 * We need to take a copy of the mount flags since things like
979 * MS_RDONLY don't get set until *after* we're called.
980 * mount_flags != mount_options
982 int reiserfs_xattr_init(struct super_block *s, int mount_flags)
985 struct dentry *privroot = REISERFS_SB(s)->priv_root;
987 err = xattr_mount_check(s);
991 if (d_really_is_negative(privroot) && !(mount_flags & MS_RDONLY)) {
992 mutex_lock(&d_inode(s->s_root)->i_mutex);
993 err = create_privroot(REISERFS_SB(s)->priv_root);
994 mutex_unlock(&d_inode(s->s_root)->i_mutex);
997 if (d_really_is_positive(privroot)) {
998 s->s_xattr = reiserfs_xattr_handlers;
999 mutex_lock(&d_inode(privroot)->i_mutex);
1000 if (!REISERFS_SB(s)->xattr_root) {
1001 struct dentry *dentry;
1003 dentry = lookup_one_len(XAROOT_NAME, privroot,
1004 strlen(XAROOT_NAME));
1005 if (!IS_ERR(dentry))
1006 REISERFS_SB(s)->xattr_root = dentry;
1008 err = PTR_ERR(dentry);
1010 mutex_unlock(&d_inode(privroot)->i_mutex);
1015 clear_bit(REISERFS_XATTRS_USER, &REISERFS_SB(s)->s_mount_opt);
1016 clear_bit(REISERFS_POSIXACL, &REISERFS_SB(s)->s_mount_opt);
1019 /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */
1020 if (reiserfs_posixacl(s))
1021 s->s_flags |= MS_POSIXACL;
1023 s->s_flags &= ~MS_POSIXACL;