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 <asm/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
)
87 BUG_ON(!mutex_is_locked(&dir
->i_mutex
));
89 mutex_lock_nested(&dentry
->d_inode
->i_mutex
, I_MUTEX_CHILD
);
90 error
= dir
->i_op
->unlink(dir
, dentry
);
91 mutex_unlock(&dentry
->d_inode
->i_mutex
);
98 static int xattr_rmdir(struct inode
*dir
, struct dentry
*dentry
)
101 BUG_ON(!mutex_is_locked(&dir
->i_mutex
));
103 mutex_lock_nested(&dentry
->d_inode
->i_mutex
, I_MUTEX_CHILD
);
104 error
= dir
->i_op
->rmdir(dir
, dentry
);
106 dentry
->d_inode
->i_flags
|= S_DEAD
;
107 mutex_unlock(&dentry
->d_inode
->i_mutex
);
114 #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE)
116 static struct dentry
*open_xa_root(struct super_block
*sb
, int flags
)
118 struct dentry
*privroot
= REISERFS_SB(sb
)->priv_root
;
119 struct dentry
*xaroot
;
120 if (!privroot
->d_inode
)
121 return ERR_PTR(-ENODATA
);
123 mutex_lock_nested(&privroot
->d_inode
->i_mutex
, I_MUTEX_XATTR
);
125 xaroot
= dget(REISERFS_SB(sb
)->xattr_root
);
127 xaroot
= ERR_PTR(-ENODATA
);
128 else if (!xaroot
->d_inode
) {
130 if (xattr_may_create(flags
))
131 err
= xattr_mkdir(privroot
->d_inode
, xaroot
, 0700);
134 xaroot
= ERR_PTR(err
);
138 mutex_unlock(&privroot
->d_inode
->i_mutex
);
142 static struct dentry
*open_xa_dir(const struct inode
*inode
, int flags
)
144 struct dentry
*xaroot
, *xadir
;
147 xaroot
= open_xa_root(inode
->i_sb
, flags
);
151 snprintf(namebuf
, sizeof(namebuf
), "%X.%X",
152 le32_to_cpu(INODE_PKEY(inode
)->k_objectid
),
153 inode
->i_generation
);
155 mutex_lock_nested(&xaroot
->d_inode
->i_mutex
, I_MUTEX_XATTR
);
157 xadir
= lookup_one_len(namebuf
, xaroot
, strlen(namebuf
));
158 if (!IS_ERR(xadir
) && !xadir
->d_inode
) {
160 if (xattr_may_create(flags
))
161 err
= xattr_mkdir(xaroot
->d_inode
, xadir
, 0700);
164 xadir
= ERR_PTR(err
);
168 mutex_unlock(&xaroot
->d_inode
->i_mutex
);
174 * The following are side effects of other operations that aren't explicitly
175 * modifying extended attributes. This includes operations such as permissions
176 * or ownership changes, object deletions, etc.
178 struct reiserfs_dentry_buf
{
179 struct dir_context ctx
;
180 struct dentry
*xadir
;
182 struct dentry
*dentries
[8];
186 fill_with_dentries(void *buf
, const char *name
, int namelen
, loff_t offset
,
187 u64 ino
, unsigned int d_type
)
189 struct reiserfs_dentry_buf
*dbuf
= buf
;
190 struct dentry
*dentry
;
191 WARN_ON_ONCE(!mutex_is_locked(&dbuf
->xadir
->d_inode
->i_mutex
));
193 if (dbuf
->count
== ARRAY_SIZE(dbuf
->dentries
))
196 if (name
[0] == '.' && (namelen
< 2 ||
197 (namelen
== 2 && name
[1] == '.')))
200 dentry
= lookup_one_len(name
, dbuf
->xadir
, namelen
);
201 if (IS_ERR(dentry
)) {
202 return PTR_ERR(dentry
);
203 } else if (!dentry
->d_inode
) {
204 /* A directory entry exists, but no file? */
205 reiserfs_error(dentry
->d_sb
, "xattr-20003",
206 "Corrupted directory: xattr %s listed but "
207 "not found for file %s.\n",
208 dentry
->d_name
.name
, dbuf
->xadir
->d_name
.name
);
213 dbuf
->dentries
[dbuf
->count
++] = dentry
;
218 cleanup_dentry_buf(struct reiserfs_dentry_buf
*buf
)
221 for (i
= 0; i
< buf
->count
; i
++)
222 if (buf
->dentries
[i
])
223 dput(buf
->dentries
[i
]);
226 static int reiserfs_for_each_xattr(struct inode
*inode
,
227 int (*action
)(struct dentry
*, void *),
232 struct reiserfs_dentry_buf buf
= {
233 .ctx
.actor
= fill_with_dentries
,
236 /* Skip out, an xattr has no xattrs associated with it */
237 if (IS_PRIVATE(inode
) || get_inode_sd_version(inode
) == STAT_DATA_V1
)
240 dir
= open_xa_dir(inode
, XATTR_REPLACE
);
244 } else if (!dir
->d_inode
) {
249 mutex_lock_nested(&dir
->d_inode
->i_mutex
, I_MUTEX_XATTR
);
253 err
= reiserfs_readdir_inode(dir
->d_inode
, &buf
.ctx
);
258 for (i
= 0; !err
&& i
< buf
.count
&& buf
.dentries
[i
]; i
++) {
259 struct dentry
*dentry
= buf
.dentries
[i
];
261 if (!S_ISDIR(dentry
->d_inode
->i_mode
))
262 err
= action(dentry
, data
);
265 buf
.dentries
[i
] = NULL
;
271 mutex_unlock(&dir
->d_inode
->i_mutex
);
273 cleanup_dentry_buf(&buf
);
277 * We start a transaction here to avoid a ABBA situation
278 * between the xattr root's i_mutex and the journal lock.
279 * This doesn't incur much additional overhead since the
280 * new transaction will just nest inside the
283 int blocks
= JOURNAL_PER_BALANCE_CNT
* 2 + 2 +
284 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode
->i_sb
);
285 struct reiserfs_transaction_handle th
;
286 reiserfs_write_lock(inode
->i_sb
);
287 err
= journal_begin(&th
, inode
->i_sb
, blocks
);
288 reiserfs_write_unlock(inode
->i_sb
);
291 mutex_lock_nested(&dir
->d_parent
->d_inode
->i_mutex
,
293 err
= action(dir
, data
);
294 reiserfs_write_lock(inode
->i_sb
);
295 jerror
= journal_end(&th
);
296 reiserfs_write_unlock(inode
->i_sb
);
297 mutex_unlock(&dir
->d_parent
->d_inode
->i_mutex
);
304 /* -ENODATA isn't an error */
310 static int delete_one_xattr(struct dentry
*dentry
, void *data
)
312 struct inode
*dir
= dentry
->d_parent
->d_inode
;
314 /* This is the xattr dir, handle specially. */
315 if (S_ISDIR(dentry
->d_inode
->i_mode
))
316 return xattr_rmdir(dir
, dentry
);
318 return xattr_unlink(dir
, dentry
);
321 static int chown_one_xattr(struct dentry
*dentry
, void *data
)
323 struct iattr
*attrs
= data
;
324 int ia_valid
= attrs
->ia_valid
;
328 * We only want the ownership bits. Otherwise, we'll do
329 * things like change a directory to a regular file if
332 attrs
->ia_valid
&= (ATTR_UID
|ATTR_GID
);
333 err
= reiserfs_setattr(dentry
, attrs
);
334 attrs
->ia_valid
= ia_valid
;
339 /* No i_mutex, but the inode is unconnected. */
340 int reiserfs_delete_xattrs(struct inode
*inode
)
342 int err
= reiserfs_for_each_xattr(inode
, delete_one_xattr
, NULL
);
344 reiserfs_warning(inode
->i_sb
, "jdm-20004",
345 "Couldn't delete all xattrs (%d)\n", err
);
349 /* inode->i_mutex: down */
350 int reiserfs_chown_xattrs(struct inode
*inode
, struct iattr
*attrs
)
352 int err
= reiserfs_for_each_xattr(inode
, chown_one_xattr
, attrs
);
354 reiserfs_warning(inode
->i_sb
, "jdm-20007",
355 "Couldn't chown all xattrs (%d)\n", err
);
359 #ifdef CONFIG_REISERFS_FS_XATTR
361 * Returns a dentry corresponding to a specific extended attribute file
362 * for the inode. If flags allow, the file is created. Otherwise, a
363 * valid or negative dentry, or an error is returned.
365 static struct dentry
*xattr_lookup(struct inode
*inode
, const char *name
,
368 struct dentry
*xadir
, *xafile
;
371 xadir
= open_xa_dir(inode
, flags
);
373 return ERR_CAST(xadir
);
375 mutex_lock_nested(&xadir
->d_inode
->i_mutex
, I_MUTEX_XATTR
);
376 xafile
= lookup_one_len(name
, xadir
, strlen(name
));
377 if (IS_ERR(xafile
)) {
378 err
= PTR_ERR(xafile
);
382 if (xafile
->d_inode
&& (flags
& XATTR_CREATE
))
385 if (!xafile
->d_inode
) {
387 if (xattr_may_create(flags
))
388 err
= xattr_create(xadir
->d_inode
, xafile
,
395 mutex_unlock(&xadir
->d_inode
->i_mutex
);
402 /* Internal operations on file data */
403 static inline void reiserfs_put_page(struct page
*page
)
406 page_cache_release(page
);
409 static struct page
*reiserfs_get_page(struct inode
*dir
, size_t n
)
411 struct address_space
*mapping
= dir
->i_mapping
;
414 * We can deadlock if we try to free dentries,
415 * and an unlink/rmdir has just occurred - GFP_NOFS avoids this
417 mapping_set_gfp_mask(mapping
, GFP_NOFS
);
418 page
= read_mapping_page(mapping
, n
>> PAGE_CACHE_SHIFT
, NULL
);
427 reiserfs_put_page(page
);
428 return ERR_PTR(-EIO
);
431 static inline __u32
xattr_hash(const char *msg
, int len
)
433 return csum_partial(msg
, len
, 0);
436 int reiserfs_commit_write(struct file
*f
, struct page
*page
,
437 unsigned from
, unsigned to
);
439 static void update_ctime(struct inode
*inode
)
441 struct timespec now
= current_fs_time(inode
->i_sb
);
442 if (inode_unhashed(inode
) || !inode
->i_nlink
||
443 timespec_equal(&inode
->i_ctime
, &now
))
446 inode
->i_ctime
= CURRENT_TIME_SEC
;
447 mark_inode_dirty(inode
);
450 static int lookup_and_delete_xattr(struct inode
*inode
, const char *name
)
453 struct dentry
*dentry
, *xadir
;
455 xadir
= open_xa_dir(inode
, XATTR_REPLACE
);
457 return PTR_ERR(xadir
);
459 mutex_lock_nested(&xadir
->d_inode
->i_mutex
, I_MUTEX_XATTR
);
460 dentry
= lookup_one_len(name
, xadir
, strlen(name
));
461 if (IS_ERR(dentry
)) {
462 err
= PTR_ERR(dentry
);
466 if (dentry
->d_inode
) {
467 err
= xattr_unlink(xadir
->d_inode
, dentry
);
473 mutex_unlock(&xadir
->d_inode
->i_mutex
);
479 /* Generic extended attribute operations that can be used by xa plugins */
482 * inode->i_mutex: down
485 reiserfs_xattr_set_handle(struct reiserfs_transaction_handle
*th
,
486 struct inode
*inode
, const char *name
,
487 const void *buffer
, size_t buffer_size
, int flags
)
490 struct dentry
*dentry
;
494 size_t buffer_pos
= 0;
498 if (get_inode_sd_version(inode
) == STAT_DATA_V1
)
502 err
= lookup_and_delete_xattr(inode
, name
);
506 dentry
= xattr_lookup(inode
, name
, flags
);
508 return PTR_ERR(dentry
);
510 down_write(&REISERFS_I(inode
)->i_xattr_sem
);
512 xahash
= xattr_hash(buffer
, buffer_size
);
513 while (buffer_pos
< buffer_size
|| buffer_pos
== 0) {
516 size_t page_offset
= (file_pos
& (PAGE_CACHE_SIZE
- 1));
517 if (buffer_size
- buffer_pos
> PAGE_CACHE_SIZE
)
518 chunk
= PAGE_CACHE_SIZE
;
520 chunk
= buffer_size
- buffer_pos
;
522 page
= reiserfs_get_page(dentry
->d_inode
, file_pos
);
529 data
= page_address(page
);
532 struct reiserfs_xattr_header
*rxh
;
533 skip
= file_pos
= sizeof(struct reiserfs_xattr_header
);
534 if (chunk
+ skip
> PAGE_CACHE_SIZE
)
535 chunk
= PAGE_CACHE_SIZE
- skip
;
536 rxh
= (struct reiserfs_xattr_header
*)data
;
537 rxh
->h_magic
= cpu_to_le32(REISERFS_XATTR_MAGIC
);
538 rxh
->h_hash
= cpu_to_le32(xahash
);
541 reiserfs_write_lock(inode
->i_sb
);
542 err
= __reiserfs_write_begin(page
, page_offset
, chunk
+ skip
);
545 memcpy(data
+ skip
, buffer
+ buffer_pos
, chunk
);
546 err
= reiserfs_commit_write(NULL
, page
, page_offset
,
547 page_offset
+ chunk
+
550 reiserfs_write_unlock(inode
->i_sb
);
552 reiserfs_put_page(page
);
556 if (err
|| buffer_size
== 0 || !buffer
)
560 new_size
= buffer_size
+ sizeof(struct reiserfs_xattr_header
);
561 if (!err
&& new_size
< i_size_read(dentry
->d_inode
)) {
562 struct iattr newattrs
= {
563 .ia_ctime
= current_fs_time(inode
->i_sb
),
565 .ia_valid
= ATTR_SIZE
| ATTR_CTIME
,
568 mutex_lock_nested(&dentry
->d_inode
->i_mutex
, I_MUTEX_XATTR
);
569 inode_dio_wait(dentry
->d_inode
);
571 err
= reiserfs_setattr(dentry
, &newattrs
);
572 mutex_unlock(&dentry
->d_inode
->i_mutex
);
576 up_write(&REISERFS_I(inode
)->i_xattr_sem
);
581 /* We need to start a transaction to maintain lock ordering */
582 int reiserfs_xattr_set(struct inode
*inode
, const char *name
,
583 const void *buffer
, size_t buffer_size
, int flags
)
586 struct reiserfs_transaction_handle th
;
588 size_t jbegin_count
= reiserfs_xattr_nblocks(inode
, buffer_size
);
590 if (!(flags
& XATTR_REPLACE
))
591 jbegin_count
+= reiserfs_xattr_jcreate_nblocks(inode
);
593 reiserfs_write_lock(inode
->i_sb
);
594 error
= journal_begin(&th
, inode
->i_sb
, jbegin_count
);
595 reiserfs_write_unlock(inode
->i_sb
);
600 error
= reiserfs_xattr_set_handle(&th
, inode
, name
,
601 buffer
, buffer_size
, flags
);
603 reiserfs_write_lock(inode
->i_sb
);
604 error2
= journal_end(&th
);
605 reiserfs_write_unlock(inode
->i_sb
);
613 * inode->i_mutex: down
616 reiserfs_xattr_get(struct inode
*inode
, const char *name
, void *buffer
,
620 struct dentry
*dentry
;
623 size_t buffer_pos
= 0;
631 * We can't have xattrs attached to v1 items since they don't have
634 if (get_inode_sd_version(inode
) == STAT_DATA_V1
)
637 dentry
= xattr_lookup(inode
, name
, XATTR_REPLACE
);
638 if (IS_ERR(dentry
)) {
639 err
= PTR_ERR(dentry
);
643 down_read(&REISERFS_I(inode
)->i_xattr_sem
);
645 isize
= i_size_read(dentry
->d_inode
);
647 /* Just return the size needed */
648 if (buffer
== NULL
) {
649 err
= isize
- sizeof(struct reiserfs_xattr_header
);
653 if (buffer_size
< isize
- sizeof(struct reiserfs_xattr_header
)) {
658 while (file_pos
< isize
) {
662 if (isize
- file_pos
> PAGE_CACHE_SIZE
)
663 chunk
= PAGE_CACHE_SIZE
;
665 chunk
= isize
- file_pos
;
667 page
= reiserfs_get_page(dentry
->d_inode
, file_pos
);
674 data
= page_address(page
);
676 struct reiserfs_xattr_header
*rxh
=
677 (struct reiserfs_xattr_header
*)data
;
678 skip
= file_pos
= sizeof(struct reiserfs_xattr_header
);
680 /* Magic doesn't match up.. */
681 if (rxh
->h_magic
!= cpu_to_le32(REISERFS_XATTR_MAGIC
)) {
683 reiserfs_put_page(page
);
684 reiserfs_warning(inode
->i_sb
, "jdm-20001",
685 "Invalid magic for xattr (%s) "
686 "associated with %k", name
,
691 hash
= le32_to_cpu(rxh
->h_hash
);
693 memcpy(buffer
+ buffer_pos
, data
+ skip
, chunk
);
695 reiserfs_put_page(page
);
700 err
= isize
- sizeof(struct reiserfs_xattr_header
);
702 if (xattr_hash(buffer
, isize
- sizeof(struct reiserfs_xattr_header
)) !=
704 reiserfs_warning(inode
->i_sb
, "jdm-20002",
705 "Invalid hash for xattr (%s) associated "
706 "with %k", name
, INODE_PKEY(inode
));
711 up_read(&REISERFS_I(inode
)->i_xattr_sem
);
719 * In order to implement different sets of xattr operations for each xattr
720 * prefix with the generic xattr API, a filesystem should create a
721 * null-terminated array of struct xattr_handler (one for each prefix) and
722 * hang a pointer to it off of the s_xattr field of the superblock.
724 * The generic_fooxattr() functions will use this list to dispatch xattr
725 * operations to the correct xattr_handler.
727 #define for_each_xattr_handler(handlers, handler) \
728 for ((handler) = *(handlers)++; \
730 (handler) = *(handlers)++)
732 /* This is the implementation for the xattr plugin infrastructure */
733 static inline const struct xattr_handler
*
734 find_xattr_handler_prefix(const struct xattr_handler
**handlers
,
737 const struct xattr_handler
*xah
;
742 for_each_xattr_handler(handlers
, xah
) {
743 if (strncmp(xah
->prefix
, name
, strlen(xah
->prefix
)) == 0)
752 * Inode operation getxattr()
755 reiserfs_getxattr(struct dentry
* dentry
, const char *name
, void *buffer
,
758 const struct xattr_handler
*handler
;
760 handler
= find_xattr_handler_prefix(dentry
->d_sb
->s_xattr
, name
);
762 if (!handler
|| get_inode_sd_version(dentry
->d_inode
) == STAT_DATA_V1
)
765 return handler
->get(dentry
, name
, buffer
, size
, handler
->flags
);
769 * Inode operation setxattr()
771 * dentry->d_inode->i_mutex down
774 reiserfs_setxattr(struct dentry
*dentry
, const char *name
, const void *value
,
775 size_t size
, int flags
)
777 const struct xattr_handler
*handler
;
779 handler
= find_xattr_handler_prefix(dentry
->d_sb
->s_xattr
, name
);
781 if (!handler
|| get_inode_sd_version(dentry
->d_inode
) == STAT_DATA_V1
)
784 return handler
->set(dentry
, name
, value
, size
, flags
, handler
->flags
);
788 * Inode operation removexattr()
790 * dentry->d_inode->i_mutex down
792 int reiserfs_removexattr(struct dentry
*dentry
, const char *name
)
794 const struct xattr_handler
*handler
;
795 handler
= find_xattr_handler_prefix(dentry
->d_sb
->s_xattr
, name
);
797 if (!handler
|| get_inode_sd_version(dentry
->d_inode
) == STAT_DATA_V1
)
800 return handler
->set(dentry
, name
, NULL
, 0, XATTR_REPLACE
, handler
->flags
);
803 struct listxattr_buf
{
804 struct dir_context ctx
;
808 struct dentry
*dentry
;
811 static int listxattr_filler(void *buf
, const char *name
, int namelen
,
812 loff_t offset
, u64 ino
, unsigned int d_type
)
814 struct listxattr_buf
*b
= (struct listxattr_buf
*)buf
;
816 if (name
[0] != '.' ||
817 (namelen
!= 1 && (name
[1] != '.' || namelen
!= 2))) {
818 const struct xattr_handler
*handler
;
819 handler
= find_xattr_handler_prefix(b
->dentry
->d_sb
->s_xattr
,
821 if (!handler
) /* Unsupported xattr name */
824 size
= handler
->list(b
->dentry
, b
->buf
+ b
->pos
,
825 b
->size
, name
, namelen
,
830 size
= handler
->list(b
->dentry
, NULL
, 0, name
,
831 namelen
, handler
->flags
);
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 (!dentry
->d_inode
)
860 if (!dentry
->d_sb
->s_xattr
||
861 get_inode_sd_version(dentry
->d_inode
) == STAT_DATA_V1
)
864 dir
= open_xa_dir(dentry
->d_inode
, XATTR_REPLACE
);
868 err
= 0; /* Not an error if there aren't any xattrs */
872 mutex_lock_nested(&dir
->d_inode
->i_mutex
, I_MUTEX_XATTR
);
873 err
= reiserfs_readdir_inode(dir
->d_inode
, &buf
.ctx
);
874 mutex_unlock(&dir
->d_inode
->i_mutex
);
884 static int create_privroot(struct dentry
*dentry
)
887 struct inode
*inode
= dentry
->d_parent
->d_inode
;
888 WARN_ON_ONCE(!mutex_is_locked(&inode
->i_mutex
));
890 err
= xattr_mkdir(inode
, dentry
, 0700);
891 if (err
|| !dentry
->d_inode
) {
892 reiserfs_warning(dentry
->d_sb
, "jdm-20006",
893 "xattrs/ACLs enabled and couldn't "
894 "find/create .reiserfs_priv. "
899 dentry
->d_inode
->i_flags
|= S_PRIVATE
;
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 static 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
,
921 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
922 &posix_acl_access_xattr_handler
,
923 &posix_acl_default_xattr_handler
,
928 static int xattr_mount_check(struct super_block
*s
)
931 * We need generation numbers to ensure that the oid mapping is correct
932 * v3.5 filesystems don't have them.
934 if (old_format_only(s
)) {
935 if (reiserfs_xattrs_optional(s
)) {
937 * Old format filesystem, but optional xattrs have
938 * been enabled. Error out.
940 reiserfs_warning(s
, "jdm-2005",
941 "xattrs/ACLs not supported "
942 "on pre-v3.6 format filesystems. "
951 int reiserfs_permission(struct inode
*inode
, int mask
)
954 * We don't do permission checks on the internal objects.
955 * Permissions are determined by the "owning" object.
957 if (IS_PRIVATE(inode
))
960 return generic_permission(inode
, mask
);
963 static int xattr_hide_revalidate(struct dentry
*dentry
, unsigned int flags
)
968 static const struct dentry_operations xattr_lookup_poison_ops
= {
969 .d_revalidate
= xattr_hide_revalidate
,
972 int reiserfs_lookup_privroot(struct super_block
*s
)
974 struct dentry
*dentry
;
977 /* If we don't have the privroot located yet - go find it */
978 mutex_lock(&s
->s_root
->d_inode
->i_mutex
);
979 dentry
= lookup_one_len(PRIVROOT_NAME
, s
->s_root
,
980 strlen(PRIVROOT_NAME
));
981 if (!IS_ERR(dentry
)) {
982 REISERFS_SB(s
)->priv_root
= dentry
;
983 d_set_d_op(dentry
, &xattr_lookup_poison_ops
);
985 dentry
->d_inode
->i_flags
|= S_PRIVATE
;
987 err
= PTR_ERR(dentry
);
988 mutex_unlock(&s
->s_root
->d_inode
->i_mutex
);
994 * We need to take a copy of the mount flags since things like
995 * MS_RDONLY don't get set until *after* we're called.
996 * mount_flags != mount_options
998 int reiserfs_xattr_init(struct super_block
*s
, int mount_flags
)
1001 struct dentry
*privroot
= REISERFS_SB(s
)->priv_root
;
1003 err
= xattr_mount_check(s
);
1007 if (!privroot
->d_inode
&& !(mount_flags
& MS_RDONLY
)) {
1008 mutex_lock(&s
->s_root
->d_inode
->i_mutex
);
1009 err
= create_privroot(REISERFS_SB(s
)->priv_root
);
1010 mutex_unlock(&s
->s_root
->d_inode
->i_mutex
);
1013 if (privroot
->d_inode
) {
1014 s
->s_xattr
= reiserfs_xattr_handlers
;
1015 mutex_lock(&privroot
->d_inode
->i_mutex
);
1016 if (!REISERFS_SB(s
)->xattr_root
) {
1017 struct dentry
*dentry
;
1018 dentry
= lookup_one_len(XAROOT_NAME
, privroot
,
1019 strlen(XAROOT_NAME
));
1020 if (!IS_ERR(dentry
))
1021 REISERFS_SB(s
)->xattr_root
= dentry
;
1023 err
= PTR_ERR(dentry
);
1025 mutex_unlock(&privroot
->d_inode
->i_mutex
);
1030 clear_bit(REISERFS_XATTRS_USER
, &REISERFS_SB(s
)->s_mount_opt
);
1031 clear_bit(REISERFS_POSIXACL
, &REISERFS_SB(s
)->s_mount_opt
);
1034 /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */
1035 if (reiserfs_posixacl(s
))
1036 s
->s_flags
|= MS_POSIXACL
;
1038 s
->s_flags
&= ~MS_POSIXACL
;