1 // SPDX-License-Identifier: GPL-2.0
3 * linux/fs/ext4/xattr.c
5 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
7 * Fix by Harrison Xing <harrison@mountainviewdata.com>.
8 * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>.
9 * Extended attributes for symlinks and special files added per
10 * suggestion of Luka Renko <luka.renko@hermes.si>.
11 * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>,
13 * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz
14 * and Andreas Gruenbacher <agruen@suse.de>.
18 * Extended attributes are stored directly in inodes (on file systems with
19 * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl
20 * field contains the block number if an inode uses an additional block. All
21 * attributes must fit in the inode and one additional block. Blocks that
22 * contain the identical set of attributes may be shared among several inodes.
23 * Identical blocks are detected by keeping a cache of blocks that have
24 * recently been accessed.
26 * The attributes in inodes and on blocks have a different header; the entries
27 * are stored in the same format:
29 * +------------------+
32 * | entry 2 | | growing downwards
37 * | value 3 | | growing upwards
39 * +------------------+
41 * The header is followed by multiple entry descriptors. In disk blocks, the
42 * entry descriptors are kept sorted. In inodes, they are unsorted. The
43 * attribute values are aligned to the end of the block in no specific order.
47 * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem.
48 * EA blocks are only changed if they are exclusive to an inode, so
49 * holding xattr_sem also means that nothing but the EA block's reference
50 * count can change. Multiple writers to the same block are synchronized
54 #include <linux/init.h>
56 #include <linux/slab.h>
57 #include <linux/mbcache.h>
58 #include <linux/quotaops.h>
59 #include <linux/iversion.h>
60 #include "ext4_jbd2.h"
65 #ifdef EXT4_XATTR_DEBUG
66 # define ea_idebug(inode, fmt, ...) \
67 printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \
68 inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__)
69 # define ea_bdebug(bh, fmt, ...) \
70 printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \
71 bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__)
73 # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
74 # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
77 static void ext4_xattr_block_cache_insert(struct mb_cache
*,
78 struct buffer_head
*);
79 static struct buffer_head
*
80 ext4_xattr_block_cache_find(struct inode
*, struct ext4_xattr_header
*,
81 struct mb_cache_entry
**);
82 static __le32
ext4_xattr_hash_entry(char *name
, size_t name_len
, __le32
*value
,
84 static void ext4_xattr_rehash(struct ext4_xattr_header
*);
86 static const struct xattr_handler
* const ext4_xattr_handler_map
[] = {
87 [EXT4_XATTR_INDEX_USER
] = &ext4_xattr_user_handler
,
88 #ifdef CONFIG_EXT4_FS_POSIX_ACL
89 [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS
] = &posix_acl_access_xattr_handler
,
90 [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT
] = &posix_acl_default_xattr_handler
,
92 [EXT4_XATTR_INDEX_TRUSTED
] = &ext4_xattr_trusted_handler
,
93 #ifdef CONFIG_EXT4_FS_SECURITY
94 [EXT4_XATTR_INDEX_SECURITY
] = &ext4_xattr_security_handler
,
98 const struct xattr_handler
*ext4_xattr_handlers
[] = {
99 &ext4_xattr_user_handler
,
100 &ext4_xattr_trusted_handler
,
101 #ifdef CONFIG_EXT4_FS_POSIX_ACL
102 &posix_acl_access_xattr_handler
,
103 &posix_acl_default_xattr_handler
,
105 #ifdef CONFIG_EXT4_FS_SECURITY
106 &ext4_xattr_security_handler
,
111 #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \
112 inode->i_sb->s_fs_info)->s_ea_block_cache)
114 #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \
115 inode->i_sb->s_fs_info)->s_ea_inode_cache)
118 ext4_expand_inode_array(struct ext4_xattr_inode_array
**ea_inode_array
,
119 struct inode
*inode
);
121 #ifdef CONFIG_LOCKDEP
122 void ext4_xattr_inode_set_class(struct inode
*ea_inode
)
124 lockdep_set_subclass(&ea_inode
->i_rwsem
, 1);
128 static __le32
ext4_xattr_block_csum(struct inode
*inode
,
130 struct ext4_xattr_header
*hdr
)
132 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
134 __le64 dsk_block_nr
= cpu_to_le64(block_nr
);
135 __u32 dummy_csum
= 0;
136 int offset
= offsetof(struct ext4_xattr_header
, h_checksum
);
138 csum
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&dsk_block_nr
,
139 sizeof(dsk_block_nr
));
140 csum
= ext4_chksum(sbi
, csum
, (__u8
*)hdr
, offset
);
141 csum
= ext4_chksum(sbi
, csum
, (__u8
*)&dummy_csum
, sizeof(dummy_csum
));
142 offset
+= sizeof(dummy_csum
);
143 csum
= ext4_chksum(sbi
, csum
, (__u8
*)hdr
+ offset
,
144 EXT4_BLOCK_SIZE(inode
->i_sb
) - offset
);
146 return cpu_to_le32(csum
);
149 static int ext4_xattr_block_csum_verify(struct inode
*inode
,
150 struct buffer_head
*bh
)
152 struct ext4_xattr_header
*hdr
= BHDR(bh
);
155 if (ext4_has_metadata_csum(inode
->i_sb
)) {
157 ret
= (hdr
->h_checksum
== ext4_xattr_block_csum(inode
,
158 bh
->b_blocknr
, hdr
));
164 static void ext4_xattr_block_csum_set(struct inode
*inode
,
165 struct buffer_head
*bh
)
167 if (ext4_has_metadata_csum(inode
->i_sb
))
168 BHDR(bh
)->h_checksum
= ext4_xattr_block_csum(inode
,
169 bh
->b_blocknr
, BHDR(bh
));
172 static inline const struct xattr_handler
*
173 ext4_xattr_handler(int name_index
)
175 const struct xattr_handler
*handler
= NULL
;
177 if (name_index
> 0 && name_index
< ARRAY_SIZE(ext4_xattr_handler_map
))
178 handler
= ext4_xattr_handler_map
[name_index
];
183 ext4_xattr_check_entries(struct ext4_xattr_entry
*entry
, void *end
,
186 struct ext4_xattr_entry
*e
= entry
;
188 /* Find the end of the names list */
189 while (!IS_LAST_ENTRY(e
)) {
190 struct ext4_xattr_entry
*next
= EXT4_XATTR_NEXT(e
);
191 if ((void *)next
>= end
)
192 return -EFSCORRUPTED
;
193 if (strnlen(e
->e_name
, e
->e_name_len
) != e
->e_name_len
)
194 return -EFSCORRUPTED
;
198 /* Check the values */
199 while (!IS_LAST_ENTRY(entry
)) {
200 u32 size
= le32_to_cpu(entry
->e_value_size
);
202 if (size
> EXT4_XATTR_SIZE_MAX
)
203 return -EFSCORRUPTED
;
205 if (size
!= 0 && entry
->e_value_inum
== 0) {
206 u16 offs
= le16_to_cpu(entry
->e_value_offs
);
210 * The value cannot overlap the names, and the value
211 * with padding cannot extend beyond 'end'. Check both
212 * the padded and unpadded sizes, since the size may
213 * overflow to 0 when adding padding.
215 if (offs
> end
- value_start
)
216 return -EFSCORRUPTED
;
217 value
= value_start
+ offs
;
218 if (value
< (void *)e
+ sizeof(u32
) ||
219 size
> end
- value
||
220 EXT4_XATTR_SIZE(size
) > end
- value
)
221 return -EFSCORRUPTED
;
223 entry
= EXT4_XATTR_NEXT(entry
);
230 __ext4_xattr_check_block(struct inode
*inode
, struct buffer_head
*bh
,
231 const char *function
, unsigned int line
)
233 int error
= -EFSCORRUPTED
;
235 if (BHDR(bh
)->h_magic
!= cpu_to_le32(EXT4_XATTR_MAGIC
) ||
236 BHDR(bh
)->h_blocks
!= cpu_to_le32(1))
238 if (buffer_verified(bh
))
242 if (!ext4_xattr_block_csum_verify(inode
, bh
))
244 error
= ext4_xattr_check_entries(BFIRST(bh
), bh
->b_data
+ bh
->b_size
,
248 __ext4_error_inode(inode
, function
, line
, 0,
249 "corrupted xattr block %llu",
250 (unsigned long long) bh
->b_blocknr
);
252 set_buffer_verified(bh
);
256 #define ext4_xattr_check_block(inode, bh) \
257 __ext4_xattr_check_block((inode), (bh), __func__, __LINE__)
261 __xattr_check_inode(struct inode
*inode
, struct ext4_xattr_ibody_header
*header
,
262 void *end
, const char *function
, unsigned int line
)
264 int error
= -EFSCORRUPTED
;
266 if (end
- (void *)header
< sizeof(*header
) + sizeof(u32
) ||
267 (header
->h_magic
!= cpu_to_le32(EXT4_XATTR_MAGIC
)))
269 error
= ext4_xattr_check_entries(IFIRST(header
), end
, IFIRST(header
));
272 __ext4_error_inode(inode
, function
, line
, 0,
273 "corrupted in-inode xattr");
277 #define xattr_check_inode(inode, header, end) \
278 __xattr_check_inode((inode), (header), (end), __func__, __LINE__)
281 xattr_find_entry(struct inode
*inode
, struct ext4_xattr_entry
**pentry
,
282 void *end
, int name_index
, const char *name
, int sorted
)
284 struct ext4_xattr_entry
*entry
, *next
;
290 name_len
= strlen(name
);
291 for (entry
= *pentry
; !IS_LAST_ENTRY(entry
); entry
= next
) {
292 next
= EXT4_XATTR_NEXT(entry
);
293 if ((void *) next
>= end
) {
294 EXT4_ERROR_INODE(inode
, "corrupted xattr entries");
295 return -EFSCORRUPTED
;
297 cmp
= name_index
- entry
->e_name_index
;
299 cmp
= name_len
- entry
->e_name_len
;
301 cmp
= memcmp(name
, entry
->e_name
, name_len
);
302 if (cmp
<= 0 && (sorted
|| cmp
== 0))
306 return cmp
? -ENODATA
: 0;
310 ext4_xattr_inode_hash(struct ext4_sb_info
*sbi
, const void *buffer
, size_t size
)
312 return ext4_chksum(sbi
, sbi
->s_csum_seed
, buffer
, size
);
315 static u64
ext4_xattr_inode_get_ref(struct inode
*ea_inode
)
317 return ((u64
)ea_inode
->i_ctime
.tv_sec
<< 32) |
318 (u32
) inode_peek_iversion_raw(ea_inode
);
321 static void ext4_xattr_inode_set_ref(struct inode
*ea_inode
, u64 ref_count
)
323 ea_inode
->i_ctime
.tv_sec
= (u32
)(ref_count
>> 32);
324 inode_set_iversion_raw(ea_inode
, ref_count
& 0xffffffff);
327 static u32
ext4_xattr_inode_get_hash(struct inode
*ea_inode
)
329 return (u32
)ea_inode
->i_atime
.tv_sec
;
332 static void ext4_xattr_inode_set_hash(struct inode
*ea_inode
, u32 hash
)
334 ea_inode
->i_atime
.tv_sec
= hash
;
338 * Read the EA value from an inode.
340 static int ext4_xattr_inode_read(struct inode
*ea_inode
, void *buf
, size_t size
)
342 int blocksize
= 1 << ea_inode
->i_blkbits
;
343 int bh_count
= (size
+ blocksize
- 1) >> ea_inode
->i_blkbits
;
344 int tail_size
= (size
% blocksize
) ?: blocksize
;
345 struct buffer_head
*bhs_inline
[8];
346 struct buffer_head
**bhs
= bhs_inline
;
349 if (bh_count
> ARRAY_SIZE(bhs_inline
)) {
350 bhs
= kmalloc_array(bh_count
, sizeof(*bhs
), GFP_NOFS
);
355 ret
= ext4_bread_batch(ea_inode
, 0 /* block */, bh_count
,
356 true /* wait */, bhs
);
360 for (i
= 0; i
< bh_count
; i
++) {
361 /* There shouldn't be any holes in ea_inode. */
366 memcpy((char *)buf
+ blocksize
* i
, bhs
[i
]->b_data
,
367 i
< bh_count
- 1 ? blocksize
: tail_size
);
371 for (i
= 0; i
< bh_count
; i
++)
374 if (bhs
!= bhs_inline
)
379 #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec)
381 static int ext4_xattr_inode_iget(struct inode
*parent
, unsigned long ea_ino
,
382 u32 ea_inode_hash
, struct inode
**ea_inode
)
387 inode
= ext4_iget(parent
->i_sb
, ea_ino
, EXT4_IGET_NORMAL
);
389 err
= PTR_ERR(inode
);
390 ext4_error(parent
->i_sb
,
391 "error while reading EA inode %lu err=%d", ea_ino
,
396 if (is_bad_inode(inode
)) {
397 ext4_error(parent
->i_sb
,
398 "error while reading EA inode %lu is_bad_inode",
404 if (!(EXT4_I(inode
)->i_flags
& EXT4_EA_INODE_FL
)) {
405 ext4_error(parent
->i_sb
,
406 "EA inode %lu does not have EXT4_EA_INODE_FL flag",
412 ext4_xattr_inode_set_class(inode
);
415 * Check whether this is an old Lustre-style xattr inode. Lustre
416 * implementation does not have hash validation, rather it has a
417 * backpointer from ea_inode to the parent inode.
419 if (ea_inode_hash
!= ext4_xattr_inode_get_hash(inode
) &&
420 EXT4_XATTR_INODE_GET_PARENT(inode
) == parent
->i_ino
&&
421 inode
->i_generation
== parent
->i_generation
) {
422 ext4_set_inode_state(inode
, EXT4_STATE_LUSTRE_EA_INODE
);
423 ext4_xattr_inode_set_ref(inode
, 1);
426 inode
->i_flags
|= S_NOQUOTA
;
438 ext4_xattr_inode_verify_hashes(struct inode
*ea_inode
,
439 struct ext4_xattr_entry
*entry
, void *buffer
,
444 /* Verify stored hash matches calculated hash. */
445 hash
= ext4_xattr_inode_hash(EXT4_SB(ea_inode
->i_sb
), buffer
, size
);
446 if (hash
!= ext4_xattr_inode_get_hash(ea_inode
))
447 return -EFSCORRUPTED
;
450 __le32 e_hash
, tmp_data
;
452 /* Verify entry hash. */
453 tmp_data
= cpu_to_le32(hash
);
454 e_hash
= ext4_xattr_hash_entry(entry
->e_name
, entry
->e_name_len
,
456 if (e_hash
!= entry
->e_hash
)
457 return -EFSCORRUPTED
;
463 * Read xattr value from the EA inode.
466 ext4_xattr_inode_get(struct inode
*inode
, struct ext4_xattr_entry
*entry
,
467 void *buffer
, size_t size
)
469 struct mb_cache
*ea_inode_cache
= EA_INODE_CACHE(inode
);
470 struct inode
*ea_inode
;
473 err
= ext4_xattr_inode_iget(inode
, le32_to_cpu(entry
->e_value_inum
),
474 le32_to_cpu(entry
->e_hash
), &ea_inode
);
480 if (i_size_read(ea_inode
) != size
) {
481 ext4_warning_inode(ea_inode
,
482 "ea_inode file size=%llu entry size=%zu",
483 i_size_read(ea_inode
), size
);
488 err
= ext4_xattr_inode_read(ea_inode
, buffer
, size
);
492 if (!ext4_test_inode_state(ea_inode
, EXT4_STATE_LUSTRE_EA_INODE
)) {
493 err
= ext4_xattr_inode_verify_hashes(ea_inode
, entry
, buffer
,
496 ext4_warning_inode(ea_inode
,
497 "EA inode hash validation failed");
502 mb_cache_entry_create(ea_inode_cache
, GFP_NOFS
,
503 ext4_xattr_inode_get_hash(ea_inode
),
504 ea_inode
->i_ino
, true /* reusable */);
512 ext4_xattr_block_get(struct inode
*inode
, int name_index
, const char *name
,
513 void *buffer
, size_t buffer_size
)
515 struct buffer_head
*bh
= NULL
;
516 struct ext4_xattr_entry
*entry
;
520 struct mb_cache
*ea_block_cache
= EA_BLOCK_CACHE(inode
);
522 ea_idebug(inode
, "name=%d.%s, buffer=%p, buffer_size=%ld",
523 name_index
, name
, buffer
, (long)buffer_size
);
525 if (!EXT4_I(inode
)->i_file_acl
)
527 ea_idebug(inode
, "reading block %llu",
528 (unsigned long long)EXT4_I(inode
)->i_file_acl
);
529 bh
= ext4_sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
, REQ_PRIO
);
532 ea_bdebug(bh
, "b_count=%d, refcount=%d",
533 atomic_read(&(bh
->b_count
)), le32_to_cpu(BHDR(bh
)->h_refcount
));
534 error
= ext4_xattr_check_block(inode
, bh
);
537 ext4_xattr_block_cache_insert(ea_block_cache
, bh
);
539 end
= bh
->b_data
+ bh
->b_size
;
540 error
= xattr_find_entry(inode
, &entry
, end
, name_index
, name
, 1);
543 size
= le32_to_cpu(entry
->e_value_size
);
545 if (unlikely(size
> EXT4_XATTR_SIZE_MAX
))
548 if (size
> buffer_size
)
550 if (entry
->e_value_inum
) {
551 error
= ext4_xattr_inode_get(inode
, entry
, buffer
,
556 u16 offset
= le16_to_cpu(entry
->e_value_offs
);
557 void *p
= bh
->b_data
+ offset
;
559 if (unlikely(p
+ size
> end
))
561 memcpy(buffer
, p
, size
);
572 ext4_xattr_ibody_get(struct inode
*inode
, int name_index
, const char *name
,
573 void *buffer
, size_t buffer_size
)
575 struct ext4_xattr_ibody_header
*header
;
576 struct ext4_xattr_entry
*entry
;
577 struct ext4_inode
*raw_inode
;
578 struct ext4_iloc iloc
;
583 if (!ext4_test_inode_state(inode
, EXT4_STATE_XATTR
))
585 error
= ext4_get_inode_loc(inode
, &iloc
);
588 raw_inode
= ext4_raw_inode(&iloc
);
589 header
= IHDR(inode
, raw_inode
);
590 end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
591 error
= xattr_check_inode(inode
, header
, end
);
594 entry
= IFIRST(header
);
595 error
= xattr_find_entry(inode
, &entry
, end
, name_index
, name
, 0);
598 size
= le32_to_cpu(entry
->e_value_size
);
600 if (unlikely(size
> EXT4_XATTR_SIZE_MAX
))
603 if (size
> buffer_size
)
605 if (entry
->e_value_inum
) {
606 error
= ext4_xattr_inode_get(inode
, entry
, buffer
,
611 u16 offset
= le16_to_cpu(entry
->e_value_offs
);
612 void *p
= (void *)IFIRST(header
) + offset
;
614 if (unlikely(p
+ size
> end
))
616 memcpy(buffer
, p
, size
);
629 * Copy an extended attribute into the buffer
630 * provided, or compute the buffer size required.
631 * Buffer is NULL to compute the size of the buffer required.
633 * Returns a negative error number on failure, or the number of bytes
634 * used / required on success.
637 ext4_xattr_get(struct inode
*inode
, int name_index
, const char *name
,
638 void *buffer
, size_t buffer_size
)
642 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
645 if (strlen(name
) > 255)
648 down_read(&EXT4_I(inode
)->xattr_sem
);
649 error
= ext4_xattr_ibody_get(inode
, name_index
, name
, buffer
,
651 if (error
== -ENODATA
)
652 error
= ext4_xattr_block_get(inode
, name_index
, name
, buffer
,
654 up_read(&EXT4_I(inode
)->xattr_sem
);
659 ext4_xattr_list_entries(struct dentry
*dentry
, struct ext4_xattr_entry
*entry
,
660 char *buffer
, size_t buffer_size
)
662 size_t rest
= buffer_size
;
664 for (; !IS_LAST_ENTRY(entry
); entry
= EXT4_XATTR_NEXT(entry
)) {
665 const struct xattr_handler
*handler
=
666 ext4_xattr_handler(entry
->e_name_index
);
668 if (handler
&& (!handler
->list
|| handler
->list(dentry
))) {
669 const char *prefix
= handler
->prefix
?: handler
->name
;
670 size_t prefix_len
= strlen(prefix
);
671 size_t size
= prefix_len
+ entry
->e_name_len
+ 1;
676 memcpy(buffer
, prefix
, prefix_len
);
677 buffer
+= prefix_len
;
678 memcpy(buffer
, entry
->e_name
, entry
->e_name_len
);
679 buffer
+= entry
->e_name_len
;
685 return buffer_size
- rest
; /* total size */
689 ext4_xattr_block_list(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
691 struct inode
*inode
= d_inode(dentry
);
692 struct buffer_head
*bh
= NULL
;
695 ea_idebug(inode
, "buffer=%p, buffer_size=%ld",
696 buffer
, (long)buffer_size
);
698 if (!EXT4_I(inode
)->i_file_acl
)
700 ea_idebug(inode
, "reading block %llu",
701 (unsigned long long)EXT4_I(inode
)->i_file_acl
);
702 bh
= ext4_sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
, REQ_PRIO
);
705 ea_bdebug(bh
, "b_count=%d, refcount=%d",
706 atomic_read(&(bh
->b_count
)), le32_to_cpu(BHDR(bh
)->h_refcount
));
707 error
= ext4_xattr_check_block(inode
, bh
);
710 ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode
), bh
);
711 error
= ext4_xattr_list_entries(dentry
, BFIRST(bh
), buffer
,
719 ext4_xattr_ibody_list(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
721 struct inode
*inode
= d_inode(dentry
);
722 struct ext4_xattr_ibody_header
*header
;
723 struct ext4_inode
*raw_inode
;
724 struct ext4_iloc iloc
;
728 if (!ext4_test_inode_state(inode
, EXT4_STATE_XATTR
))
730 error
= ext4_get_inode_loc(inode
, &iloc
);
733 raw_inode
= ext4_raw_inode(&iloc
);
734 header
= IHDR(inode
, raw_inode
);
735 end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
736 error
= xattr_check_inode(inode
, header
, end
);
739 error
= ext4_xattr_list_entries(dentry
, IFIRST(header
),
740 buffer
, buffer_size
);
748 * Inode operation listxattr()
750 * d_inode(dentry)->i_rwsem: don't care
752 * Copy a list of attribute names into the buffer
753 * provided, or compute the buffer size required.
754 * Buffer is NULL to compute the size of the buffer required.
756 * Returns a negative error number on failure, or the number of bytes
757 * used / required on success.
760 ext4_listxattr(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
764 down_read(&EXT4_I(d_inode(dentry
))->xattr_sem
);
765 ret
= ret2
= ext4_xattr_ibody_list(dentry
, buffer
, buffer_size
);
772 ret
= ext4_xattr_block_list(dentry
, buffer
, buffer_size
);
777 up_read(&EXT4_I(d_inode(dentry
))->xattr_sem
);
782 * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is
785 static void ext4_xattr_update_super_block(handle_t
*handle
,
786 struct super_block
*sb
)
788 if (ext4_has_feature_xattr(sb
))
791 BUFFER_TRACE(EXT4_SB(sb
)->s_sbh
, "get_write_access");
792 if (ext4_journal_get_write_access(handle
, EXT4_SB(sb
)->s_sbh
) == 0) {
793 ext4_set_feature_xattr(sb
);
794 ext4_handle_dirty_super(handle
, sb
);
798 int ext4_get_inode_usage(struct inode
*inode
, qsize_t
*usage
)
800 struct ext4_iloc iloc
= { .bh
= NULL
};
801 struct buffer_head
*bh
= NULL
;
802 struct ext4_inode
*raw_inode
;
803 struct ext4_xattr_ibody_header
*header
;
804 struct ext4_xattr_entry
*entry
;
805 qsize_t ea_inode_refs
= 0;
809 lockdep_assert_held_read(&EXT4_I(inode
)->xattr_sem
);
811 if (ext4_test_inode_state(inode
, EXT4_STATE_XATTR
)) {
812 ret
= ext4_get_inode_loc(inode
, &iloc
);
815 raw_inode
= ext4_raw_inode(&iloc
);
816 header
= IHDR(inode
, raw_inode
);
817 end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
818 ret
= xattr_check_inode(inode
, header
, end
);
822 for (entry
= IFIRST(header
); !IS_LAST_ENTRY(entry
);
823 entry
= EXT4_XATTR_NEXT(entry
))
824 if (entry
->e_value_inum
)
828 if (EXT4_I(inode
)->i_file_acl
) {
829 bh
= ext4_sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
, REQ_PRIO
);
835 ret
= ext4_xattr_check_block(inode
, bh
);
839 for (entry
= BFIRST(bh
); !IS_LAST_ENTRY(entry
);
840 entry
= EXT4_XATTR_NEXT(entry
))
841 if (entry
->e_value_inum
)
844 *usage
= ea_inode_refs
+ 1;
852 static inline size_t round_up_cluster(struct inode
*inode
, size_t length
)
854 struct super_block
*sb
= inode
->i_sb
;
855 size_t cluster_size
= 1 << (EXT4_SB(sb
)->s_cluster_bits
+
857 size_t mask
= ~(cluster_size
- 1);
859 return (length
+ cluster_size
- 1) & mask
;
862 static int ext4_xattr_inode_alloc_quota(struct inode
*inode
, size_t len
)
866 err
= dquot_alloc_inode(inode
);
869 err
= dquot_alloc_space_nodirty(inode
, round_up_cluster(inode
, len
));
871 dquot_free_inode(inode
);
875 static void ext4_xattr_inode_free_quota(struct inode
*parent
,
876 struct inode
*ea_inode
,
880 ext4_test_inode_state(ea_inode
, EXT4_STATE_LUSTRE_EA_INODE
))
882 dquot_free_space_nodirty(parent
, round_up_cluster(parent
, len
));
883 dquot_free_inode(parent
);
886 int __ext4_xattr_set_credits(struct super_block
*sb
, struct inode
*inode
,
887 struct buffer_head
*block_bh
, size_t value_len
,
894 * 1) Owner inode update
895 * 2) Ref count update on old xattr block
897 * 4) block bitmap update for new xattr block
898 * 5) group descriptor for new xattr block
899 * 6) block bitmap update for old xattr block
900 * 7) group descriptor for old block
902 * 6 & 7 can happen if we have two racing threads T_a and T_b
903 * which are each trying to set an xattr on inodes I_a and I_b
904 * which were both initially sharing an xattr block.
909 credits
+= EXT4_MAXQUOTAS_TRANS_BLOCKS(sb
);
912 * In case of inline data, we may push out the data to a block,
913 * so we need to reserve credits for this eventuality
915 if (inode
&& ext4_has_inline_data(inode
))
916 credits
+= ext4_writepage_trans_blocks(inode
) + 1;
918 /* We are done if ea_inode feature is not enabled. */
919 if (!ext4_has_feature_ea_inode(sb
))
922 /* New ea_inode, inode map, block bitmap, group descriptor. */
926 blocks
= (value_len
+ sb
->s_blocksize
- 1) >> sb
->s_blocksize_bits
;
928 /* Indirection block or one level of extent tree. */
931 /* Block bitmap and group descriptor updates for each block. */
932 credits
+= blocks
* 2;
934 /* Blocks themselves. */
938 /* Dereference ea_inode holding old xattr value.
939 * Old ea_inode, inode map, block bitmap, group descriptor.
943 /* Data blocks for old ea_inode. */
944 blocks
= XATTR_SIZE_MAX
>> sb
->s_blocksize_bits
;
946 /* Indirection block or one level of extent tree for old
951 /* Block bitmap and group descriptor updates for each block. */
952 credits
+= blocks
* 2;
955 /* We may need to clone the existing xattr block in which case we need
956 * to increment ref counts for existing ea_inodes referenced by it.
959 struct ext4_xattr_entry
*entry
= BFIRST(block_bh
);
961 for (; !IS_LAST_ENTRY(entry
); entry
= EXT4_XATTR_NEXT(entry
))
962 if (entry
->e_value_inum
)
963 /* Ref count update on ea_inode. */
969 static int ext4_xattr_ensure_credits(handle_t
*handle
, struct inode
*inode
,
970 int credits
, struct buffer_head
*bh
,
971 bool dirty
, bool block_csum
)
975 if (!ext4_handle_valid(handle
))
978 if (handle
->h_buffer_credits
>= credits
)
981 error
= ext4_journal_extend(handle
, credits
- handle
->h_buffer_credits
);
985 ext4_warning(inode
->i_sb
, "Extend journal (error %d)", error
);
991 ext4_xattr_block_csum_set(inode
, bh
);
992 error
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
994 ext4_warning(inode
->i_sb
, "Handle metadata (error %d)",
1000 error
= ext4_journal_restart(handle
, credits
);
1002 ext4_warning(inode
->i_sb
, "Restart journal (error %d)", error
);
1007 error
= ext4_journal_get_write_access(handle
, bh
);
1009 ext4_warning(inode
->i_sb
,
1010 "Get write access failed (error %d)",
1018 static int ext4_xattr_inode_update_ref(handle_t
*handle
, struct inode
*ea_inode
,
1021 struct mb_cache
*ea_inode_cache
= EA_INODE_CACHE(ea_inode
);
1022 struct ext4_iloc iloc
;
1027 inode_lock(ea_inode
);
1029 ret
= ext4_reserve_inode_write(handle
, ea_inode
, &iloc
);
1033 ref_count
= ext4_xattr_inode_get_ref(ea_inode
);
1034 ref_count
+= ref_change
;
1035 ext4_xattr_inode_set_ref(ea_inode
, ref_count
);
1037 if (ref_change
> 0) {
1038 WARN_ONCE(ref_count
<= 0, "EA inode %lu ref_count=%lld",
1039 ea_inode
->i_ino
, ref_count
);
1041 if (ref_count
== 1) {
1042 WARN_ONCE(ea_inode
->i_nlink
, "EA inode %lu i_nlink=%u",
1043 ea_inode
->i_ino
, ea_inode
->i_nlink
);
1045 set_nlink(ea_inode
, 1);
1046 ext4_orphan_del(handle
, ea_inode
);
1048 if (ea_inode_cache
) {
1049 hash
= ext4_xattr_inode_get_hash(ea_inode
);
1050 mb_cache_entry_create(ea_inode_cache
,
1053 true /* reusable */);
1057 WARN_ONCE(ref_count
< 0, "EA inode %lu ref_count=%lld",
1058 ea_inode
->i_ino
, ref_count
);
1060 if (ref_count
== 0) {
1061 WARN_ONCE(ea_inode
->i_nlink
!= 1,
1062 "EA inode %lu i_nlink=%u",
1063 ea_inode
->i_ino
, ea_inode
->i_nlink
);
1065 clear_nlink(ea_inode
);
1066 ext4_orphan_add(handle
, ea_inode
);
1068 if (ea_inode_cache
) {
1069 hash
= ext4_xattr_inode_get_hash(ea_inode
);
1070 mb_cache_entry_delete(ea_inode_cache
, hash
,
1076 ret
= ext4_mark_iloc_dirty(handle
, ea_inode
, &iloc
);
1078 ext4_warning_inode(ea_inode
,
1079 "ext4_mark_iloc_dirty() failed ret=%d", ret
);
1081 inode_unlock(ea_inode
);
1085 static int ext4_xattr_inode_inc_ref(handle_t
*handle
, struct inode
*ea_inode
)
1087 return ext4_xattr_inode_update_ref(handle
, ea_inode
, 1);
1090 static int ext4_xattr_inode_dec_ref(handle_t
*handle
, struct inode
*ea_inode
)
1092 return ext4_xattr_inode_update_ref(handle
, ea_inode
, -1);
1095 static int ext4_xattr_inode_inc_ref_all(handle_t
*handle
, struct inode
*parent
,
1096 struct ext4_xattr_entry
*first
)
1098 struct inode
*ea_inode
;
1099 struct ext4_xattr_entry
*entry
;
1100 struct ext4_xattr_entry
*failed_entry
;
1101 unsigned int ea_ino
;
1104 for (entry
= first
; !IS_LAST_ENTRY(entry
);
1105 entry
= EXT4_XATTR_NEXT(entry
)) {
1106 if (!entry
->e_value_inum
)
1108 ea_ino
= le32_to_cpu(entry
->e_value_inum
);
1109 err
= ext4_xattr_inode_iget(parent
, ea_ino
,
1110 le32_to_cpu(entry
->e_hash
),
1114 err
= ext4_xattr_inode_inc_ref(handle
, ea_inode
);
1116 ext4_warning_inode(ea_inode
, "inc ref error %d", err
);
1126 failed_entry
= entry
;
1128 for (entry
= first
; entry
!= failed_entry
;
1129 entry
= EXT4_XATTR_NEXT(entry
)) {
1130 if (!entry
->e_value_inum
)
1132 ea_ino
= le32_to_cpu(entry
->e_value_inum
);
1133 err
= ext4_xattr_inode_iget(parent
, ea_ino
,
1134 le32_to_cpu(entry
->e_hash
),
1137 ext4_warning(parent
->i_sb
,
1138 "cleanup ea_ino %u iget error %d", ea_ino
,
1142 err
= ext4_xattr_inode_dec_ref(handle
, ea_inode
);
1144 ext4_warning_inode(ea_inode
, "cleanup dec ref error %d",
1152 ext4_xattr_inode_dec_ref_all(handle_t
*handle
, struct inode
*parent
,
1153 struct buffer_head
*bh
,
1154 struct ext4_xattr_entry
*first
, bool block_csum
,
1155 struct ext4_xattr_inode_array
**ea_inode_array
,
1156 int extra_credits
, bool skip_quota
)
1158 struct inode
*ea_inode
;
1159 struct ext4_xattr_entry
*entry
;
1161 unsigned int ea_ino
;
1165 /* One credit for dec ref on ea_inode, one for orphan list addition, */
1166 credits
= 2 + extra_credits
;
1168 for (entry
= first
; !IS_LAST_ENTRY(entry
);
1169 entry
= EXT4_XATTR_NEXT(entry
)) {
1170 if (!entry
->e_value_inum
)
1172 ea_ino
= le32_to_cpu(entry
->e_value_inum
);
1173 err
= ext4_xattr_inode_iget(parent
, ea_ino
,
1174 le32_to_cpu(entry
->e_hash
),
1179 err
= ext4_expand_inode_array(ea_inode_array
, ea_inode
);
1181 ext4_warning_inode(ea_inode
,
1182 "Expand inode array err=%d", err
);
1187 err
= ext4_xattr_ensure_credits(handle
, parent
, credits
, bh
,
1190 ext4_warning_inode(ea_inode
, "Ensure credits err=%d",
1195 err
= ext4_xattr_inode_dec_ref(handle
, ea_inode
);
1197 ext4_warning_inode(ea_inode
, "ea_inode dec ref err=%d",
1203 ext4_xattr_inode_free_quota(parent
, ea_inode
,
1204 le32_to_cpu(entry
->e_value_size
));
1207 * Forget about ea_inode within the same transaction that
1208 * decrements the ref count. This avoids duplicate decrements in
1209 * case the rest of the work spills over to subsequent
1212 entry
->e_value_inum
= 0;
1213 entry
->e_value_size
= 0;
1220 * Note that we are deliberately skipping csum calculation for
1221 * the final update because we do not expect any journal
1222 * restarts until xattr block is freed.
1225 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
1227 ext4_warning_inode(parent
,
1228 "handle dirty metadata err=%d", err
);
1233 * Release the xattr block BH: If the reference count is > 1, decrement it;
1234 * otherwise free the block.
1237 ext4_xattr_release_block(handle_t
*handle
, struct inode
*inode
,
1238 struct buffer_head
*bh
,
1239 struct ext4_xattr_inode_array
**ea_inode_array
,
1242 struct mb_cache
*ea_block_cache
= EA_BLOCK_CACHE(inode
);
1246 BUFFER_TRACE(bh
, "get_write_access");
1247 error
= ext4_journal_get_write_access(handle
, bh
);
1252 hash
= le32_to_cpu(BHDR(bh
)->h_hash
);
1253 ref
= le32_to_cpu(BHDR(bh
)->h_refcount
);
1255 ea_bdebug(bh
, "refcount now=0; freeing");
1257 * This must happen under buffer lock for
1258 * ext4_xattr_block_set() to reliably detect freed block
1261 mb_cache_entry_delete(ea_block_cache
, hash
,
1266 if (ext4_has_feature_ea_inode(inode
->i_sb
))
1267 ext4_xattr_inode_dec_ref_all(handle
, inode
, bh
,
1269 true /* block_csum */,
1272 true /* skip_quota */);
1273 ext4_free_blocks(handle
, inode
, bh
, 0, 1,
1274 EXT4_FREE_BLOCKS_METADATA
|
1275 EXT4_FREE_BLOCKS_FORGET
);
1278 BHDR(bh
)->h_refcount
= cpu_to_le32(ref
);
1279 if (ref
== EXT4_XATTR_REFCOUNT_MAX
- 1) {
1280 struct mb_cache_entry
*ce
;
1282 if (ea_block_cache
) {
1283 ce
= mb_cache_entry_get(ea_block_cache
, hash
,
1287 mb_cache_entry_put(ea_block_cache
, ce
);
1292 ext4_xattr_block_csum_set(inode
, bh
);
1294 * Beware of this ugliness: Releasing of xattr block references
1295 * from different inodes can race and so we have to protect
1296 * from a race where someone else frees the block (and releases
1297 * its journal_head) before we are done dirtying the buffer. In
1298 * nojournal mode this race is harmless and we actually cannot
1299 * call ext4_handle_dirty_metadata() with locked buffer as
1300 * that function can call sync_dirty_buffer() so for that case
1301 * we handle the dirtying after unlocking the buffer.
1303 if (ext4_handle_valid(handle
))
1304 error
= ext4_handle_dirty_metadata(handle
, inode
, bh
);
1306 if (!ext4_handle_valid(handle
))
1307 error
= ext4_handle_dirty_metadata(handle
, inode
, bh
);
1309 ext4_handle_sync(handle
);
1310 dquot_free_block(inode
, EXT4_C2B(EXT4_SB(inode
->i_sb
), 1));
1311 ea_bdebug(bh
, "refcount now=%d; releasing",
1312 le32_to_cpu(BHDR(bh
)->h_refcount
));
1315 ext4_std_error(inode
->i_sb
, error
);
1320 * Find the available free space for EAs. This also returns the total number of
1321 * bytes used by EA entries.
1323 static size_t ext4_xattr_free_space(struct ext4_xattr_entry
*last
,
1324 size_t *min_offs
, void *base
, int *total
)
1326 for (; !IS_LAST_ENTRY(last
); last
= EXT4_XATTR_NEXT(last
)) {
1327 if (!last
->e_value_inum
&& last
->e_value_size
) {
1328 size_t offs
= le16_to_cpu(last
->e_value_offs
);
1329 if (offs
< *min_offs
)
1333 *total
+= EXT4_XATTR_LEN(last
->e_name_len
);
1335 return (*min_offs
- ((void *)last
- base
) - sizeof(__u32
));
1339 * Write the value of the EA in an inode.
1341 static int ext4_xattr_inode_write(handle_t
*handle
, struct inode
*ea_inode
,
1342 const void *buf
, int bufsize
)
1344 struct buffer_head
*bh
= NULL
;
1345 unsigned long block
= 0;
1346 int blocksize
= ea_inode
->i_sb
->s_blocksize
;
1347 int max_blocks
= (bufsize
+ blocksize
- 1) >> ea_inode
->i_blkbits
;
1348 int csize
, wsize
= 0;
1353 while (ret
>= 0 && ret
< max_blocks
) {
1354 struct ext4_map_blocks map
;
1355 map
.m_lblk
= block
+= ret
;
1356 map
.m_len
= max_blocks
-= ret
;
1358 ret
= ext4_map_blocks(handle
, ea_inode
, &map
,
1359 EXT4_GET_BLOCKS_CREATE
);
1361 ext4_mark_inode_dirty(handle
, ea_inode
);
1362 if (ret
== -ENOSPC
&&
1363 ext4_should_retry_alloc(ea_inode
->i_sb
, &retries
)) {
1375 while (wsize
< bufsize
) {
1378 csize
= (bufsize
- wsize
) > blocksize
? blocksize
:
1380 bh
= ext4_getblk(handle
, ea_inode
, block
, 0);
1385 EXT4_ERROR_INODE(ea_inode
,
1386 "ext4_getblk() return bh = NULL");
1387 return -EFSCORRUPTED
;
1389 ret
= ext4_journal_get_write_access(handle
, bh
);
1393 memcpy(bh
->b_data
, buf
, csize
);
1394 set_buffer_uptodate(bh
);
1395 ext4_handle_dirty_metadata(handle
, ea_inode
, bh
);
1402 inode_lock(ea_inode
);
1403 i_size_write(ea_inode
, wsize
);
1404 ext4_update_i_disksize(ea_inode
, wsize
);
1405 inode_unlock(ea_inode
);
1407 ext4_mark_inode_dirty(handle
, ea_inode
);
1416 * Create an inode to store the value of a large EA.
1418 static struct inode
*ext4_xattr_inode_create(handle_t
*handle
,
1419 struct inode
*inode
, u32 hash
)
1421 struct inode
*ea_inode
= NULL
;
1422 uid_t owner
[2] = { i_uid_read(inode
), i_gid_read(inode
) };
1426 * Let the next inode be the goal, so we try and allocate the EA inode
1427 * in the same group, or nearby one.
1429 ea_inode
= ext4_new_inode(handle
, inode
->i_sb
->s_root
->d_inode
,
1430 S_IFREG
| 0600, NULL
, inode
->i_ino
+ 1, owner
,
1432 if (!IS_ERR(ea_inode
)) {
1433 ea_inode
->i_op
= &ext4_file_inode_operations
;
1434 ea_inode
->i_fop
= &ext4_file_operations
;
1435 ext4_set_aops(ea_inode
);
1436 ext4_xattr_inode_set_class(ea_inode
);
1437 unlock_new_inode(ea_inode
);
1438 ext4_xattr_inode_set_ref(ea_inode
, 1);
1439 ext4_xattr_inode_set_hash(ea_inode
, hash
);
1440 err
= ext4_mark_inode_dirty(handle
, ea_inode
);
1442 err
= ext4_inode_attach_jinode(ea_inode
);
1445 return ERR_PTR(err
);
1449 * Xattr inodes are shared therefore quota charging is performed
1450 * at a higher level.
1452 dquot_free_inode(ea_inode
);
1453 dquot_drop(ea_inode
);
1454 inode_lock(ea_inode
);
1455 ea_inode
->i_flags
|= S_NOQUOTA
;
1456 inode_unlock(ea_inode
);
1462 static struct inode
*
1463 ext4_xattr_inode_cache_find(struct inode
*inode
, const void *value
,
1464 size_t value_len
, u32 hash
)
1466 struct inode
*ea_inode
;
1467 struct mb_cache_entry
*ce
;
1468 struct mb_cache
*ea_inode_cache
= EA_INODE_CACHE(inode
);
1471 if (!ea_inode_cache
)
1474 ce
= mb_cache_entry_find_first(ea_inode_cache
, hash
);
1478 ea_data
= ext4_kvmalloc(value_len
, GFP_NOFS
);
1480 mb_cache_entry_put(ea_inode_cache
, ce
);
1485 ea_inode
= ext4_iget(inode
->i_sb
, ce
->e_value
,
1487 if (!IS_ERR(ea_inode
) &&
1488 !is_bad_inode(ea_inode
) &&
1489 (EXT4_I(ea_inode
)->i_flags
& EXT4_EA_INODE_FL
) &&
1490 i_size_read(ea_inode
) == value_len
&&
1491 !ext4_xattr_inode_read(ea_inode
, ea_data
, value_len
) &&
1492 !ext4_xattr_inode_verify_hashes(ea_inode
, NULL
, ea_data
,
1494 !memcmp(value
, ea_data
, value_len
)) {
1495 mb_cache_entry_touch(ea_inode_cache
, ce
);
1496 mb_cache_entry_put(ea_inode_cache
, ce
);
1501 if (!IS_ERR(ea_inode
))
1503 ce
= mb_cache_entry_find_next(ea_inode_cache
, ce
);
1510 * Add value of the EA in an inode.
1512 static int ext4_xattr_inode_lookup_create(handle_t
*handle
, struct inode
*inode
,
1513 const void *value
, size_t value_len
,
1514 struct inode
**ret_inode
)
1516 struct inode
*ea_inode
;
1520 hash
= ext4_xattr_inode_hash(EXT4_SB(inode
->i_sb
), value
, value_len
);
1521 ea_inode
= ext4_xattr_inode_cache_find(inode
, value
, value_len
, hash
);
1523 err
= ext4_xattr_inode_inc_ref(handle
, ea_inode
);
1529 *ret_inode
= ea_inode
;
1533 /* Create an inode for the EA value */
1534 ea_inode
= ext4_xattr_inode_create(handle
, inode
, hash
);
1535 if (IS_ERR(ea_inode
))
1536 return PTR_ERR(ea_inode
);
1538 err
= ext4_xattr_inode_write(handle
, ea_inode
, value
, value_len
);
1540 ext4_xattr_inode_dec_ref(handle
, ea_inode
);
1545 if (EA_INODE_CACHE(inode
))
1546 mb_cache_entry_create(EA_INODE_CACHE(inode
), GFP_NOFS
, hash
,
1547 ea_inode
->i_ino
, true /* reusable */);
1549 *ret_inode
= ea_inode
;
1554 * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode
1555 * feature is enabled.
1557 #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U)
1559 static int ext4_xattr_set_entry(struct ext4_xattr_info
*i
,
1560 struct ext4_xattr_search
*s
,
1561 handle_t
*handle
, struct inode
*inode
,
1564 struct ext4_xattr_entry
*last
, *next
;
1565 struct ext4_xattr_entry
*here
= s
->here
;
1566 size_t min_offs
= s
->end
- s
->base
, name_len
= strlen(i
->name
);
1567 int in_inode
= i
->in_inode
;
1568 struct inode
*old_ea_inode
= NULL
;
1569 struct inode
*new_ea_inode
= NULL
;
1570 size_t old_size
, new_size
;
1573 /* Space used by old and new values. */
1574 old_size
= (!s
->not_found
&& !here
->e_value_inum
) ?
1575 EXT4_XATTR_SIZE(le32_to_cpu(here
->e_value_size
)) : 0;
1576 new_size
= (i
->value
&& !in_inode
) ? EXT4_XATTR_SIZE(i
->value_len
) : 0;
1579 * Optimization for the simple case when old and new values have the
1580 * same padded sizes. Not applicable if external inodes are involved.
1582 if (new_size
&& new_size
== old_size
) {
1583 size_t offs
= le16_to_cpu(here
->e_value_offs
);
1584 void *val
= s
->base
+ offs
;
1586 here
->e_value_size
= cpu_to_le32(i
->value_len
);
1587 if (i
->value
== EXT4_ZERO_XATTR_VALUE
) {
1588 memset(val
, 0, new_size
);
1590 memcpy(val
, i
->value
, i
->value_len
);
1591 /* Clear padding bytes. */
1592 memset(val
+ i
->value_len
, 0, new_size
- i
->value_len
);
1597 /* Compute min_offs and last. */
1599 for (; !IS_LAST_ENTRY(last
); last
= next
) {
1600 next
= EXT4_XATTR_NEXT(last
);
1601 if ((void *)next
>= s
->end
) {
1602 EXT4_ERROR_INODE(inode
, "corrupted xattr entries");
1603 ret
= -EFSCORRUPTED
;
1606 if (!last
->e_value_inum
&& last
->e_value_size
) {
1607 size_t offs
= le16_to_cpu(last
->e_value_offs
);
1608 if (offs
< min_offs
)
1613 /* Check whether we have enough space. */
1617 free
= min_offs
- ((void *)last
- s
->base
) - sizeof(__u32
);
1619 free
+= EXT4_XATTR_LEN(name_len
) + old_size
;
1621 if (free
< EXT4_XATTR_LEN(name_len
) + new_size
) {
1627 * If storing the value in an external inode is an option,
1628 * reserve space for xattr entries/names in the external
1629 * attribute block so that a long value does not occupy the
1630 * whole space and prevent futher entries being added.
1632 if (ext4_has_feature_ea_inode(inode
->i_sb
) &&
1633 new_size
&& is_block
&&
1634 (min_offs
+ old_size
- new_size
) <
1635 EXT4_XATTR_BLOCK_RESERVE(inode
)) {
1642 * Getting access to old and new ea inodes is subject to failures.
1643 * Finish that work before doing any modifications to the xattr data.
1645 if (!s
->not_found
&& here
->e_value_inum
) {
1646 ret
= ext4_xattr_inode_iget(inode
,
1647 le32_to_cpu(here
->e_value_inum
),
1648 le32_to_cpu(here
->e_hash
),
1651 old_ea_inode
= NULL
;
1655 if (i
->value
&& in_inode
) {
1656 WARN_ON_ONCE(!i
->value_len
);
1658 ret
= ext4_xattr_inode_alloc_quota(inode
, i
->value_len
);
1662 ret
= ext4_xattr_inode_lookup_create(handle
, inode
, i
->value
,
1666 new_ea_inode
= NULL
;
1667 ext4_xattr_inode_free_quota(inode
, NULL
, i
->value_len
);
1673 /* We are ready to release ref count on the old_ea_inode. */
1674 ret
= ext4_xattr_inode_dec_ref(handle
, old_ea_inode
);
1676 /* Release newly required ref count on new_ea_inode. */
1680 err
= ext4_xattr_inode_dec_ref(handle
,
1683 ext4_warning_inode(new_ea_inode
,
1684 "dec ref new_ea_inode err=%d",
1686 ext4_xattr_inode_free_quota(inode
, new_ea_inode
,
1692 ext4_xattr_inode_free_quota(inode
, old_ea_inode
,
1693 le32_to_cpu(here
->e_value_size
));
1696 /* No failures allowed past this point. */
1698 if (!s
->not_found
&& here
->e_value_size
&& here
->e_value_offs
) {
1699 /* Remove the old value. */
1700 void *first_val
= s
->base
+ min_offs
;
1701 size_t offs
= le16_to_cpu(here
->e_value_offs
);
1702 void *val
= s
->base
+ offs
;
1704 memmove(first_val
+ old_size
, first_val
, val
- first_val
);
1705 memset(first_val
, 0, old_size
);
1706 min_offs
+= old_size
;
1708 /* Adjust all value offsets. */
1710 while (!IS_LAST_ENTRY(last
)) {
1711 size_t o
= le16_to_cpu(last
->e_value_offs
);
1713 if (!last
->e_value_inum
&&
1714 last
->e_value_size
&& o
< offs
)
1715 last
->e_value_offs
= cpu_to_le16(o
+ old_size
);
1716 last
= EXT4_XATTR_NEXT(last
);
1721 /* Remove old name. */
1722 size_t size
= EXT4_XATTR_LEN(name_len
);
1724 last
= ENTRY((void *)last
- size
);
1725 memmove(here
, (void *)here
+ size
,
1726 (void *)last
- (void *)here
+ sizeof(__u32
));
1727 memset(last
, 0, size
);
1728 } else if (s
->not_found
) {
1729 /* Insert new name. */
1730 size_t size
= EXT4_XATTR_LEN(name_len
);
1731 size_t rest
= (void *)last
- (void *)here
+ sizeof(__u32
);
1733 memmove((void *)here
+ size
, here
, rest
);
1734 memset(here
, 0, size
);
1735 here
->e_name_index
= i
->name_index
;
1736 here
->e_name_len
= name_len
;
1737 memcpy(here
->e_name
, i
->name
, name_len
);
1739 /* This is an update, reset value info. */
1740 here
->e_value_inum
= 0;
1741 here
->e_value_offs
= 0;
1742 here
->e_value_size
= 0;
1746 /* Insert new value. */
1748 here
->e_value_inum
= cpu_to_le32(new_ea_inode
->i_ino
);
1749 } else if (i
->value_len
) {
1750 void *val
= s
->base
+ min_offs
- new_size
;
1752 here
->e_value_offs
= cpu_to_le16(min_offs
- new_size
);
1753 if (i
->value
== EXT4_ZERO_XATTR_VALUE
) {
1754 memset(val
, 0, new_size
);
1756 memcpy(val
, i
->value
, i
->value_len
);
1757 /* Clear padding bytes. */
1758 memset(val
+ i
->value_len
, 0,
1759 new_size
- i
->value_len
);
1762 here
->e_value_size
= cpu_to_le32(i
->value_len
);
1769 /* Entry hash calculation. */
1774 * Feed crc32c hash instead of the raw value for entry
1775 * hash calculation. This is to avoid walking
1776 * potentially long value buffer again.
1778 crc32c_hash
= cpu_to_le32(
1779 ext4_xattr_inode_get_hash(new_ea_inode
));
1780 hash
= ext4_xattr_hash_entry(here
->e_name
,
1783 } else if (is_block
) {
1784 __le32
*value
= s
->base
+ le16_to_cpu(
1785 here
->e_value_offs
);
1787 hash
= ext4_xattr_hash_entry(here
->e_name
,
1788 here
->e_name_len
, value
,
1791 here
->e_hash
= hash
;
1795 ext4_xattr_rehash((struct ext4_xattr_header
*)s
->base
);
1804 struct ext4_xattr_block_find
{
1805 struct ext4_xattr_search s
;
1806 struct buffer_head
*bh
;
1810 ext4_xattr_block_find(struct inode
*inode
, struct ext4_xattr_info
*i
,
1811 struct ext4_xattr_block_find
*bs
)
1813 struct super_block
*sb
= inode
->i_sb
;
1816 ea_idebug(inode
, "name=%d.%s, value=%p, value_len=%ld",
1817 i
->name_index
, i
->name
, i
->value
, (long)i
->value_len
);
1819 if (EXT4_I(inode
)->i_file_acl
) {
1820 /* The inode already has an extended attribute block. */
1821 bs
->bh
= ext4_sb_bread(sb
, EXT4_I(inode
)->i_file_acl
, REQ_PRIO
);
1823 return PTR_ERR(bs
->bh
);
1824 ea_bdebug(bs
->bh
, "b_count=%d, refcount=%d",
1825 atomic_read(&(bs
->bh
->b_count
)),
1826 le32_to_cpu(BHDR(bs
->bh
)->h_refcount
));
1827 error
= ext4_xattr_check_block(inode
, bs
->bh
);
1830 /* Find the named attribute. */
1831 bs
->s
.base
= BHDR(bs
->bh
);
1832 bs
->s
.first
= BFIRST(bs
->bh
);
1833 bs
->s
.end
= bs
->bh
->b_data
+ bs
->bh
->b_size
;
1834 bs
->s
.here
= bs
->s
.first
;
1835 error
= xattr_find_entry(inode
, &bs
->s
.here
, bs
->s
.end
,
1836 i
->name_index
, i
->name
, 1);
1837 if (error
&& error
!= -ENODATA
)
1839 bs
->s
.not_found
= error
;
1845 ext4_xattr_block_set(handle_t
*handle
, struct inode
*inode
,
1846 struct ext4_xattr_info
*i
,
1847 struct ext4_xattr_block_find
*bs
)
1849 struct super_block
*sb
= inode
->i_sb
;
1850 struct buffer_head
*new_bh
= NULL
;
1851 struct ext4_xattr_search s_copy
= bs
->s
;
1852 struct ext4_xattr_search
*s
= &s_copy
;
1853 struct mb_cache_entry
*ce
= NULL
;
1855 struct mb_cache
*ea_block_cache
= EA_BLOCK_CACHE(inode
);
1856 struct inode
*ea_inode
= NULL
, *tmp_inode
;
1857 size_t old_ea_inode_quota
= 0;
1858 unsigned int ea_ino
;
1861 #define header(x) ((struct ext4_xattr_header *)(x))
1864 BUFFER_TRACE(bs
->bh
, "get_write_access");
1865 error
= ext4_journal_get_write_access(handle
, bs
->bh
);
1868 lock_buffer(bs
->bh
);
1870 if (header(s
->base
)->h_refcount
== cpu_to_le32(1)) {
1871 __u32 hash
= le32_to_cpu(BHDR(bs
->bh
)->h_hash
);
1874 * This must happen under buffer lock for
1875 * ext4_xattr_block_set() to reliably detect modified
1879 mb_cache_entry_delete(ea_block_cache
, hash
,
1881 ea_bdebug(bs
->bh
, "modifying in-place");
1882 error
= ext4_xattr_set_entry(i
, s
, handle
, inode
,
1883 true /* is_block */);
1884 ext4_xattr_block_csum_set(inode
, bs
->bh
);
1885 unlock_buffer(bs
->bh
);
1886 if (error
== -EFSCORRUPTED
)
1889 error
= ext4_handle_dirty_metadata(handle
,
1896 int offset
= (char *)s
->here
- bs
->bh
->b_data
;
1898 unlock_buffer(bs
->bh
);
1899 ea_bdebug(bs
->bh
, "cloning");
1900 s
->base
= kmalloc(bs
->bh
->b_size
, GFP_NOFS
);
1902 if (s
->base
== NULL
)
1904 memcpy(s
->base
, BHDR(bs
->bh
), bs
->bh
->b_size
);
1905 s
->first
= ENTRY(header(s
->base
)+1);
1906 header(s
->base
)->h_refcount
= cpu_to_le32(1);
1907 s
->here
= ENTRY(s
->base
+ offset
);
1908 s
->end
= s
->base
+ bs
->bh
->b_size
;
1911 * If existing entry points to an xattr inode, we need
1912 * to prevent ext4_xattr_set_entry() from decrementing
1913 * ref count on it because the reference belongs to the
1914 * original block. In this case, make the entry look
1915 * like it has an empty value.
1917 if (!s
->not_found
&& s
->here
->e_value_inum
) {
1918 ea_ino
= le32_to_cpu(s
->here
->e_value_inum
);
1919 error
= ext4_xattr_inode_iget(inode
, ea_ino
,
1920 le32_to_cpu(s
->here
->e_hash
),
1925 if (!ext4_test_inode_state(tmp_inode
,
1926 EXT4_STATE_LUSTRE_EA_INODE
)) {
1928 * Defer quota free call for previous
1929 * inode until success is guaranteed.
1931 old_ea_inode_quota
= le32_to_cpu(
1932 s
->here
->e_value_size
);
1936 s
->here
->e_value_inum
= 0;
1937 s
->here
->e_value_size
= 0;
1941 /* Allocate a buffer where we construct the new block. */
1942 s
->base
= kzalloc(sb
->s_blocksize
, GFP_NOFS
);
1943 /* assert(header == s->base) */
1945 if (s
->base
== NULL
)
1947 header(s
->base
)->h_magic
= cpu_to_le32(EXT4_XATTR_MAGIC
);
1948 header(s
->base
)->h_blocks
= cpu_to_le32(1);
1949 header(s
->base
)->h_refcount
= cpu_to_le32(1);
1950 s
->first
= ENTRY(header(s
->base
)+1);
1951 s
->here
= ENTRY(header(s
->base
)+1);
1952 s
->end
= s
->base
+ sb
->s_blocksize
;
1955 error
= ext4_xattr_set_entry(i
, s
, handle
, inode
, true /* is_block */);
1956 if (error
== -EFSCORRUPTED
)
1961 if (i
->value
&& s
->here
->e_value_inum
) {
1963 * A ref count on ea_inode has been taken as part of the call to
1964 * ext4_xattr_set_entry() above. We would like to drop this
1965 * extra ref but we have to wait until the xattr block is
1966 * initialized and has its own ref count on the ea_inode.
1968 ea_ino
= le32_to_cpu(s
->here
->e_value_inum
);
1969 error
= ext4_xattr_inode_iget(inode
, ea_ino
,
1970 le32_to_cpu(s
->here
->e_hash
),
1979 if (!IS_LAST_ENTRY(s
->first
)) {
1980 new_bh
= ext4_xattr_block_cache_find(inode
, header(s
->base
),
1983 /* We found an identical block in the cache. */
1984 if (new_bh
== bs
->bh
)
1985 ea_bdebug(new_bh
, "keeping");
1989 WARN_ON_ONCE(dquot_initialize_needed(inode
));
1991 /* The old block is released after updating
1993 error
= dquot_alloc_block(inode
,
1994 EXT4_C2B(EXT4_SB(sb
), 1));
1997 BUFFER_TRACE(new_bh
, "get_write_access");
1998 error
= ext4_journal_get_write_access(handle
,
2002 lock_buffer(new_bh
);
2004 * We have to be careful about races with
2005 * freeing, rehashing or adding references to
2006 * xattr block. Once we hold buffer lock xattr
2007 * block's state is stable so we can check
2008 * whether the block got freed / rehashed or
2009 * not. Since we unhash mbcache entry under
2010 * buffer lock when freeing / rehashing xattr
2011 * block, checking whether entry is still
2012 * hashed is reliable. Same rules hold for
2013 * e_reusable handling.
2015 if (hlist_bl_unhashed(&ce
->e_hash_list
) ||
2018 * Undo everything and check mbcache
2021 unlock_buffer(new_bh
);
2022 dquot_free_block(inode
,
2023 EXT4_C2B(EXT4_SB(sb
),
2026 mb_cache_entry_put(ea_block_cache
, ce
);
2031 ref
= le32_to_cpu(BHDR(new_bh
)->h_refcount
) + 1;
2032 BHDR(new_bh
)->h_refcount
= cpu_to_le32(ref
);
2033 if (ref
>= EXT4_XATTR_REFCOUNT_MAX
)
2035 ea_bdebug(new_bh
, "reusing; refcount now=%d",
2037 ext4_xattr_block_csum_set(inode
, new_bh
);
2038 unlock_buffer(new_bh
);
2039 error
= ext4_handle_dirty_metadata(handle
,
2045 mb_cache_entry_touch(ea_block_cache
, ce
);
2046 mb_cache_entry_put(ea_block_cache
, ce
);
2048 } else if (bs
->bh
&& s
->base
== bs
->bh
->b_data
) {
2049 /* We were modifying this block in-place. */
2050 ea_bdebug(bs
->bh
, "keeping this block");
2051 ext4_xattr_block_cache_insert(ea_block_cache
, bs
->bh
);
2055 /* We need to allocate a new block */
2056 ext4_fsblk_t goal
, block
;
2058 WARN_ON_ONCE(dquot_initialize_needed(inode
));
2060 goal
= ext4_group_first_block_no(sb
,
2061 EXT4_I(inode
)->i_block_group
);
2063 /* non-extent files can't have physical blocks past 2^32 */
2064 if (!(ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)))
2065 goal
= goal
& EXT4_MAX_BLOCK_FILE_PHYS
;
2067 block
= ext4_new_meta_blocks(handle
, inode
, goal
, 0,
2072 if (!(ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)))
2073 BUG_ON(block
> EXT4_MAX_BLOCK_FILE_PHYS
);
2075 ea_idebug(inode
, "creating block %llu",
2076 (unsigned long long)block
);
2078 new_bh
= sb_getblk(sb
, block
);
2079 if (unlikely(!new_bh
)) {
2082 ext4_free_blocks(handle
, inode
, NULL
, block
, 1,
2083 EXT4_FREE_BLOCKS_METADATA
);
2086 error
= ext4_xattr_inode_inc_ref_all(handle
, inode
,
2087 ENTRY(header(s
->base
)+1));
2091 /* Drop the extra ref on ea_inode. */
2092 error
= ext4_xattr_inode_dec_ref(handle
,
2095 ext4_warning_inode(ea_inode
,
2102 lock_buffer(new_bh
);
2103 error
= ext4_journal_get_create_access(handle
, new_bh
);
2105 unlock_buffer(new_bh
);
2109 memcpy(new_bh
->b_data
, s
->base
, new_bh
->b_size
);
2110 ext4_xattr_block_csum_set(inode
, new_bh
);
2111 set_buffer_uptodate(new_bh
);
2112 unlock_buffer(new_bh
);
2113 ext4_xattr_block_cache_insert(ea_block_cache
, new_bh
);
2114 error
= ext4_handle_dirty_metadata(handle
, inode
,
2121 if (old_ea_inode_quota
)
2122 ext4_xattr_inode_free_quota(inode
, NULL
, old_ea_inode_quota
);
2124 /* Update the inode. */
2125 EXT4_I(inode
)->i_file_acl
= new_bh
? new_bh
->b_blocknr
: 0;
2127 /* Drop the previous xattr block. */
2128 if (bs
->bh
&& bs
->bh
!= new_bh
) {
2129 struct ext4_xattr_inode_array
*ea_inode_array
= NULL
;
2131 ext4_xattr_release_block(handle
, inode
, bs
->bh
,
2133 0 /* extra_credits */);
2134 ext4_xattr_inode_array_free(ea_inode_array
);
2142 error2
= ext4_xattr_inode_dec_ref(handle
, ea_inode
);
2144 ext4_warning_inode(ea_inode
, "dec ref error=%d",
2147 /* If there was an error, revert the quota charge. */
2149 ext4_xattr_inode_free_quota(inode
, ea_inode
,
2150 i_size_read(ea_inode
));
2154 mb_cache_entry_put(ea_block_cache
, ce
);
2156 if (!(bs
->bh
&& s
->base
== bs
->bh
->b_data
))
2162 dquot_free_block(inode
, EXT4_C2B(EXT4_SB(sb
), 1));
2166 EXT4_ERROR_INODE(inode
, "bad block %llu",
2167 EXT4_I(inode
)->i_file_acl
);
2173 int ext4_xattr_ibody_find(struct inode
*inode
, struct ext4_xattr_info
*i
,
2174 struct ext4_xattr_ibody_find
*is
)
2176 struct ext4_xattr_ibody_header
*header
;
2177 struct ext4_inode
*raw_inode
;
2180 if (EXT4_I(inode
)->i_extra_isize
== 0)
2182 raw_inode
= ext4_raw_inode(&is
->iloc
);
2183 header
= IHDR(inode
, raw_inode
);
2184 is
->s
.base
= is
->s
.first
= IFIRST(header
);
2185 is
->s
.here
= is
->s
.first
;
2186 is
->s
.end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
2187 if (ext4_test_inode_state(inode
, EXT4_STATE_XATTR
)) {
2188 error
= xattr_check_inode(inode
, header
, is
->s
.end
);
2191 /* Find the named attribute. */
2192 error
= xattr_find_entry(inode
, &is
->s
.here
, is
->s
.end
,
2193 i
->name_index
, i
->name
, 0);
2194 if (error
&& error
!= -ENODATA
)
2196 is
->s
.not_found
= error
;
2201 int ext4_xattr_ibody_inline_set(handle_t
*handle
, struct inode
*inode
,
2202 struct ext4_xattr_info
*i
,
2203 struct ext4_xattr_ibody_find
*is
)
2205 struct ext4_xattr_ibody_header
*header
;
2206 struct ext4_xattr_search
*s
= &is
->s
;
2209 if (EXT4_I(inode
)->i_extra_isize
== 0)
2211 error
= ext4_xattr_set_entry(i
, s
, handle
, inode
, false /* is_block */);
2214 header
= IHDR(inode
, ext4_raw_inode(&is
->iloc
));
2215 if (!IS_LAST_ENTRY(s
->first
)) {
2216 header
->h_magic
= cpu_to_le32(EXT4_XATTR_MAGIC
);
2217 ext4_set_inode_state(inode
, EXT4_STATE_XATTR
);
2219 header
->h_magic
= cpu_to_le32(0);
2220 ext4_clear_inode_state(inode
, EXT4_STATE_XATTR
);
2225 static int ext4_xattr_ibody_set(handle_t
*handle
, struct inode
*inode
,
2226 struct ext4_xattr_info
*i
,
2227 struct ext4_xattr_ibody_find
*is
)
2229 struct ext4_xattr_ibody_header
*header
;
2230 struct ext4_xattr_search
*s
= &is
->s
;
2233 if (EXT4_I(inode
)->i_extra_isize
== 0)
2235 error
= ext4_xattr_set_entry(i
, s
, handle
, inode
, false /* is_block */);
2238 header
= IHDR(inode
, ext4_raw_inode(&is
->iloc
));
2239 if (!IS_LAST_ENTRY(s
->first
)) {
2240 header
->h_magic
= cpu_to_le32(EXT4_XATTR_MAGIC
);
2241 ext4_set_inode_state(inode
, EXT4_STATE_XATTR
);
2243 header
->h_magic
= cpu_to_le32(0);
2244 ext4_clear_inode_state(inode
, EXT4_STATE_XATTR
);
2249 static int ext4_xattr_value_same(struct ext4_xattr_search
*s
,
2250 struct ext4_xattr_info
*i
)
2254 /* When e_value_inum is set the value is stored externally. */
2255 if (s
->here
->e_value_inum
)
2257 if (le32_to_cpu(s
->here
->e_value_size
) != i
->value_len
)
2259 value
= ((void *)s
->base
) + le16_to_cpu(s
->here
->e_value_offs
);
2260 return !memcmp(value
, i
->value
, i
->value_len
);
2263 static struct buffer_head
*ext4_xattr_get_block(struct inode
*inode
)
2265 struct buffer_head
*bh
;
2268 if (!EXT4_I(inode
)->i_file_acl
)
2270 bh
= ext4_sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
, REQ_PRIO
);
2273 error
= ext4_xattr_check_block(inode
, bh
);
2276 return ERR_PTR(error
);
2282 * ext4_xattr_set_handle()
2284 * Create, replace or remove an extended attribute for this inode. Value
2285 * is NULL to remove an existing extended attribute, and non-NULL to
2286 * either replace an existing extended attribute, or create a new extended
2287 * attribute. The flags XATTR_REPLACE and XATTR_CREATE
2288 * specify that an extended attribute must exist and must not exist
2289 * previous to the call, respectively.
2291 * Returns 0, or a negative error number on failure.
2294 ext4_xattr_set_handle(handle_t
*handle
, struct inode
*inode
, int name_index
,
2295 const char *name
, const void *value
, size_t value_len
,
2298 struct ext4_xattr_info i
= {
2299 .name_index
= name_index
,
2302 .value_len
= value_len
,
2305 struct ext4_xattr_ibody_find is
= {
2306 .s
= { .not_found
= -ENODATA
, },
2308 struct ext4_xattr_block_find bs
= {
2309 .s
= { .not_found
= -ENODATA
, },
2316 if (strlen(name
) > 255)
2319 ext4_write_lock_xattr(inode
, &no_expand
);
2321 /* Check journal credits under write lock. */
2322 if (ext4_handle_valid(handle
)) {
2323 struct buffer_head
*bh
;
2326 bh
= ext4_xattr_get_block(inode
);
2328 error
= PTR_ERR(bh
);
2332 credits
= __ext4_xattr_set_credits(inode
->i_sb
, inode
, bh
,
2334 flags
& XATTR_CREATE
);
2337 if (!ext4_handle_has_enough_credits(handle
, credits
)) {
2343 error
= ext4_reserve_inode_write(handle
, inode
, &is
.iloc
);
2347 if (ext4_test_inode_state(inode
, EXT4_STATE_NEW
)) {
2348 struct ext4_inode
*raw_inode
= ext4_raw_inode(&is
.iloc
);
2349 memset(raw_inode
, 0, EXT4_SB(inode
->i_sb
)->s_inode_size
);
2350 ext4_clear_inode_state(inode
, EXT4_STATE_NEW
);
2353 error
= ext4_xattr_ibody_find(inode
, &i
, &is
);
2357 error
= ext4_xattr_block_find(inode
, &i
, &bs
);
2360 if (is
.s
.not_found
&& bs
.s
.not_found
) {
2362 if (flags
& XATTR_REPLACE
)
2369 if (flags
& XATTR_CREATE
)
2374 if (!is
.s
.not_found
)
2375 error
= ext4_xattr_ibody_set(handle
, inode
, &i
, &is
);
2376 else if (!bs
.s
.not_found
)
2377 error
= ext4_xattr_block_set(handle
, inode
, &i
, &bs
);
2380 /* Xattr value did not change? Save us some work and bail out */
2381 if (!is
.s
.not_found
&& ext4_xattr_value_same(&is
.s
, &i
))
2383 if (!bs
.s
.not_found
&& ext4_xattr_value_same(&bs
.s
, &i
))
2386 if (ext4_has_feature_ea_inode(inode
->i_sb
) &&
2387 (EXT4_XATTR_SIZE(i
.value_len
) >
2388 EXT4_XATTR_MIN_LARGE_EA_SIZE(inode
->i_sb
->s_blocksize
)))
2391 error
= ext4_xattr_ibody_set(handle
, inode
, &i
, &is
);
2392 if (!error
&& !bs
.s
.not_found
) {
2394 error
= ext4_xattr_block_set(handle
, inode
, &i
, &bs
);
2395 } else if (error
== -ENOSPC
) {
2396 if (EXT4_I(inode
)->i_file_acl
&& !bs
.s
.base
) {
2399 error
= ext4_xattr_block_find(inode
, &i
, &bs
);
2403 error
= ext4_xattr_block_set(handle
, inode
, &i
, &bs
);
2404 if (!error
&& !is
.s
.not_found
) {
2406 error
= ext4_xattr_ibody_set(handle
, inode
, &i
,
2408 } else if (error
== -ENOSPC
) {
2410 * Xattr does not fit in the block, store at
2411 * external inode if possible.
2413 if (ext4_has_feature_ea_inode(inode
->i_sb
) &&
2422 ext4_xattr_update_super_block(handle
, inode
->i_sb
);
2423 inode
->i_ctime
= current_time(inode
);
2426 error
= ext4_mark_iloc_dirty(handle
, inode
, &is
.iloc
);
2428 * The bh is consumed by ext4_mark_iloc_dirty, even with
2433 ext4_handle_sync(handle
);
2439 ext4_write_unlock_xattr(inode
, &no_expand
);
2443 int ext4_xattr_set_credits(struct inode
*inode
, size_t value_len
,
2444 bool is_create
, int *credits
)
2446 struct buffer_head
*bh
;
2451 if (!EXT4_SB(inode
->i_sb
)->s_journal
)
2454 down_read(&EXT4_I(inode
)->xattr_sem
);
2456 bh
= ext4_xattr_get_block(inode
);
2460 *credits
= __ext4_xattr_set_credits(inode
->i_sb
, inode
, bh
,
2461 value_len
, is_create
);
2466 up_read(&EXT4_I(inode
)->xattr_sem
);
2473 * Like ext4_xattr_set_handle, but start from an inode. This extended
2474 * attribute modification is a filesystem transaction by itself.
2476 * Returns 0, or a negative error number on failure.
2479 ext4_xattr_set(struct inode
*inode
, int name_index
, const char *name
,
2480 const void *value
, size_t value_len
, int flags
)
2483 struct super_block
*sb
= inode
->i_sb
;
2484 int error
, retries
= 0;
2487 error
= dquot_initialize(inode
);
2492 error
= ext4_xattr_set_credits(inode
, value_len
, flags
& XATTR_CREATE
,
2497 handle
= ext4_journal_start(inode
, EXT4_HT_XATTR
, credits
);
2498 if (IS_ERR(handle
)) {
2499 error
= PTR_ERR(handle
);
2503 error
= ext4_xattr_set_handle(handle
, inode
, name_index
, name
,
2504 value
, value_len
, flags
);
2505 error2
= ext4_journal_stop(handle
);
2506 if (error
== -ENOSPC
&&
2507 ext4_should_retry_alloc(sb
, &retries
))
2517 * Shift the EA entries in the inode to create space for the increased
2520 static void ext4_xattr_shift_entries(struct ext4_xattr_entry
*entry
,
2521 int value_offs_shift
, void *to
,
2522 void *from
, size_t n
)
2524 struct ext4_xattr_entry
*last
= entry
;
2527 /* We always shift xattr headers further thus offsets get lower */
2528 BUG_ON(value_offs_shift
> 0);
2530 /* Adjust the value offsets of the entries */
2531 for (; !IS_LAST_ENTRY(last
); last
= EXT4_XATTR_NEXT(last
)) {
2532 if (!last
->e_value_inum
&& last
->e_value_size
) {
2533 new_offs
= le16_to_cpu(last
->e_value_offs
) +
2535 last
->e_value_offs
= cpu_to_le16(new_offs
);
2538 /* Shift the entries by n bytes */
2539 memmove(to
, from
, n
);
2543 * Move xattr pointed to by 'entry' from inode into external xattr block
2545 static int ext4_xattr_move_to_block(handle_t
*handle
, struct inode
*inode
,
2546 struct ext4_inode
*raw_inode
,
2547 struct ext4_xattr_entry
*entry
)
2549 struct ext4_xattr_ibody_find
*is
= NULL
;
2550 struct ext4_xattr_block_find
*bs
= NULL
;
2551 char *buffer
= NULL
, *b_entry_name
= NULL
;
2552 size_t value_size
= le32_to_cpu(entry
->e_value_size
);
2553 struct ext4_xattr_info i
= {
2556 .name_index
= entry
->e_name_index
,
2557 .in_inode
= !!entry
->e_value_inum
,
2559 struct ext4_xattr_ibody_header
*header
= IHDR(inode
, raw_inode
);
2562 is
= kzalloc(sizeof(struct ext4_xattr_ibody_find
), GFP_NOFS
);
2563 bs
= kzalloc(sizeof(struct ext4_xattr_block_find
), GFP_NOFS
);
2564 buffer
= kmalloc(value_size
, GFP_NOFS
);
2565 b_entry_name
= kmalloc(entry
->e_name_len
+ 1, GFP_NOFS
);
2566 if (!is
|| !bs
|| !buffer
|| !b_entry_name
) {
2571 is
->s
.not_found
= -ENODATA
;
2572 bs
->s
.not_found
= -ENODATA
;
2576 /* Save the entry name and the entry value */
2577 if (entry
->e_value_inum
) {
2578 error
= ext4_xattr_inode_get(inode
, entry
, buffer
, value_size
);
2582 size_t value_offs
= le16_to_cpu(entry
->e_value_offs
);
2583 memcpy(buffer
, (void *)IFIRST(header
) + value_offs
, value_size
);
2586 memcpy(b_entry_name
, entry
->e_name
, entry
->e_name_len
);
2587 b_entry_name
[entry
->e_name_len
] = '\0';
2588 i
.name
= b_entry_name
;
2590 error
= ext4_get_inode_loc(inode
, &is
->iloc
);
2594 error
= ext4_xattr_ibody_find(inode
, &i
, is
);
2598 /* Remove the chosen entry from the inode */
2599 error
= ext4_xattr_ibody_set(handle
, inode
, &i
, is
);
2604 i
.value_len
= value_size
;
2605 error
= ext4_xattr_block_find(inode
, &i
, bs
);
2609 /* Add entry which was removed from the inode into the block */
2610 error
= ext4_xattr_block_set(handle
, inode
, &i
, bs
);
2615 kfree(b_entry_name
);
2618 brelse(is
->iloc
.bh
);
2627 static int ext4_xattr_make_inode_space(handle_t
*handle
, struct inode
*inode
,
2628 struct ext4_inode
*raw_inode
,
2629 int isize_diff
, size_t ifree
,
2630 size_t bfree
, int *total_ino
)
2632 struct ext4_xattr_ibody_header
*header
= IHDR(inode
, raw_inode
);
2633 struct ext4_xattr_entry
*small_entry
;
2634 struct ext4_xattr_entry
*entry
;
2635 struct ext4_xattr_entry
*last
;
2636 unsigned int entry_size
; /* EA entry size */
2637 unsigned int total_size
; /* EA entry size + value size */
2638 unsigned int min_total_size
;
2641 while (isize_diff
> ifree
) {
2644 min_total_size
= ~0U;
2645 last
= IFIRST(header
);
2646 /* Find the entry best suited to be pushed into EA block */
2647 for (; !IS_LAST_ENTRY(last
); last
= EXT4_XATTR_NEXT(last
)) {
2648 /* never move system.data out of the inode */
2649 if ((last
->e_name_len
== 4) &&
2650 (last
->e_name_index
== EXT4_XATTR_INDEX_SYSTEM
) &&
2651 !memcmp(last
->e_name
, "data", 4))
2653 total_size
= EXT4_XATTR_LEN(last
->e_name_len
);
2654 if (!last
->e_value_inum
)
2655 total_size
+= EXT4_XATTR_SIZE(
2656 le32_to_cpu(last
->e_value_size
));
2657 if (total_size
<= bfree
&&
2658 total_size
< min_total_size
) {
2659 if (total_size
+ ifree
< isize_diff
) {
2663 min_total_size
= total_size
;
2668 if (entry
== NULL
) {
2669 if (small_entry
== NULL
)
2671 entry
= small_entry
;
2674 entry_size
= EXT4_XATTR_LEN(entry
->e_name_len
);
2675 total_size
= entry_size
;
2676 if (!entry
->e_value_inum
)
2677 total_size
+= EXT4_XATTR_SIZE(
2678 le32_to_cpu(entry
->e_value_size
));
2679 error
= ext4_xattr_move_to_block(handle
, inode
, raw_inode
,
2684 *total_ino
-= entry_size
;
2685 ifree
+= total_size
;
2686 bfree
-= total_size
;
2693 * Expand an inode by new_extra_isize bytes when EAs are present.
2694 * Returns 0 on success or negative error number on failure.
2696 int ext4_expand_extra_isize_ea(struct inode
*inode
, int new_extra_isize
,
2697 struct ext4_inode
*raw_inode
, handle_t
*handle
)
2699 struct ext4_xattr_ibody_header
*header
;
2700 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
2701 static unsigned int mnt_count
;
2703 size_t ifree
, bfree
;
2706 int error
= 0, tried_min_extra_isize
= 0;
2707 int s_min_extra_isize
= le16_to_cpu(sbi
->s_es
->s_min_extra_isize
);
2708 int isize_diff
; /* How much do we need to grow i_extra_isize */
2711 isize_diff
= new_extra_isize
- EXT4_I(inode
)->i_extra_isize
;
2712 if (EXT4_I(inode
)->i_extra_isize
>= new_extra_isize
)
2715 header
= IHDR(inode
, raw_inode
);
2718 * Check if enough free space is available in the inode to shift the
2719 * entries ahead by new_extra_isize.
2722 base
= IFIRST(header
);
2723 end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
2724 min_offs
= end
- base
;
2725 total_ino
= sizeof(struct ext4_xattr_ibody_header
) + sizeof(u32
);
2727 error
= xattr_check_inode(inode
, header
, end
);
2731 ifree
= ext4_xattr_free_space(base
, &min_offs
, base
, &total_ino
);
2732 if (ifree
>= isize_diff
)
2736 * Enough free space isn't available in the inode, check if
2737 * EA block can hold new_extra_isize bytes.
2739 if (EXT4_I(inode
)->i_file_acl
) {
2740 struct buffer_head
*bh
;
2742 bh
= ext4_sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
, REQ_PRIO
);
2744 error
= PTR_ERR(bh
);
2747 error
= ext4_xattr_check_block(inode
, bh
);
2753 end
= bh
->b_data
+ bh
->b_size
;
2754 min_offs
= end
- base
;
2755 bfree
= ext4_xattr_free_space(BFIRST(bh
), &min_offs
, base
,
2758 if (bfree
+ ifree
< isize_diff
) {
2759 if (!tried_min_extra_isize
&& s_min_extra_isize
) {
2760 tried_min_extra_isize
++;
2761 new_extra_isize
= s_min_extra_isize
;
2768 bfree
= inode
->i_sb
->s_blocksize
;
2771 error
= ext4_xattr_make_inode_space(handle
, inode
, raw_inode
,
2772 isize_diff
, ifree
, bfree
,
2775 if (error
== -ENOSPC
&& !tried_min_extra_isize
&&
2776 s_min_extra_isize
) {
2777 tried_min_extra_isize
++;
2778 new_extra_isize
= s_min_extra_isize
;
2784 /* Adjust the offsets and shift the remaining entries ahead */
2785 ext4_xattr_shift_entries(IFIRST(header
), EXT4_I(inode
)->i_extra_isize
2786 - new_extra_isize
, (void *)raw_inode
+
2787 EXT4_GOOD_OLD_INODE_SIZE
+ new_extra_isize
,
2788 (void *)header
, total_ino
);
2789 EXT4_I(inode
)->i_extra_isize
= new_extra_isize
;
2792 if (error
&& (mnt_count
!= le16_to_cpu(sbi
->s_es
->s_mnt_count
))) {
2793 ext4_warning(inode
->i_sb
, "Unable to expand inode %lu. Delete some EAs or run e2fsck.",
2795 mnt_count
= le16_to_cpu(sbi
->s_es
->s_mnt_count
);
2800 #define EIA_INCR 16 /* must be 2^n */
2801 #define EIA_MASK (EIA_INCR - 1)
2803 /* Add the large xattr @inode into @ea_inode_array for deferred iput().
2804 * If @ea_inode_array is new or full it will be grown and the old
2805 * contents copied over.
2808 ext4_expand_inode_array(struct ext4_xattr_inode_array
**ea_inode_array
,
2809 struct inode
*inode
)
2811 if (*ea_inode_array
== NULL
) {
2813 * Start with 15 inodes, so it fits into a power-of-two size.
2814 * If *ea_inode_array is NULL, this is essentially offsetof()
2817 kmalloc(offsetof(struct ext4_xattr_inode_array
,
2820 if (*ea_inode_array
== NULL
)
2822 (*ea_inode_array
)->count
= 0;
2823 } else if (((*ea_inode_array
)->count
& EIA_MASK
) == EIA_MASK
) {
2824 /* expand the array once all 15 + n * 16 slots are full */
2825 struct ext4_xattr_inode_array
*new_array
= NULL
;
2826 int count
= (*ea_inode_array
)->count
;
2828 /* if new_array is NULL, this is essentially offsetof() */
2829 new_array
= kmalloc(
2830 offsetof(struct ext4_xattr_inode_array
,
2831 inodes
[count
+ EIA_INCR
]),
2833 if (new_array
== NULL
)
2835 memcpy(new_array
, *ea_inode_array
,
2836 offsetof(struct ext4_xattr_inode_array
, inodes
[count
]));
2837 kfree(*ea_inode_array
);
2838 *ea_inode_array
= new_array
;
2840 (*ea_inode_array
)->inodes
[(*ea_inode_array
)->count
++] = inode
;
2845 * ext4_xattr_delete_inode()
2847 * Free extended attribute resources associated with this inode. Traverse
2848 * all entries and decrement reference on any xattr inodes associated with this
2849 * inode. This is called immediately before an inode is freed. We have exclusive
2850 * access to the inode. If an orphan inode is deleted it will also release its
2851 * references on xattr block and xattr inodes.
2853 int ext4_xattr_delete_inode(handle_t
*handle
, struct inode
*inode
,
2854 struct ext4_xattr_inode_array
**ea_inode_array
,
2857 struct buffer_head
*bh
= NULL
;
2858 struct ext4_xattr_ibody_header
*header
;
2859 struct ext4_iloc iloc
= { .bh
= NULL
};
2860 struct ext4_xattr_entry
*entry
;
2861 struct inode
*ea_inode
;
2864 error
= ext4_xattr_ensure_credits(handle
, inode
, extra_credits
,
2867 false /* block_csum */);
2869 EXT4_ERROR_INODE(inode
, "ensure credits (error %d)", error
);
2873 if (ext4_has_feature_ea_inode(inode
->i_sb
) &&
2874 ext4_test_inode_state(inode
, EXT4_STATE_XATTR
)) {
2876 error
= ext4_get_inode_loc(inode
, &iloc
);
2878 EXT4_ERROR_INODE(inode
, "inode loc (error %d)", error
);
2882 error
= ext4_journal_get_write_access(handle
, iloc
.bh
);
2884 EXT4_ERROR_INODE(inode
, "write access (error %d)",
2889 header
= IHDR(inode
, ext4_raw_inode(&iloc
));
2890 if (header
->h_magic
== cpu_to_le32(EXT4_XATTR_MAGIC
))
2891 ext4_xattr_inode_dec_ref_all(handle
, inode
, iloc
.bh
,
2893 false /* block_csum */,
2896 false /* skip_quota */);
2899 if (EXT4_I(inode
)->i_file_acl
) {
2900 bh
= ext4_sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
, REQ_PRIO
);
2902 error
= PTR_ERR(bh
);
2904 EXT4_ERROR_INODE(inode
, "block %llu read error",
2905 EXT4_I(inode
)->i_file_acl
);
2908 error
= ext4_xattr_check_block(inode
, bh
);
2912 if (ext4_has_feature_ea_inode(inode
->i_sb
)) {
2913 for (entry
= BFIRST(bh
); !IS_LAST_ENTRY(entry
);
2914 entry
= EXT4_XATTR_NEXT(entry
)) {
2915 if (!entry
->e_value_inum
)
2917 error
= ext4_xattr_inode_iget(inode
,
2918 le32_to_cpu(entry
->e_value_inum
),
2919 le32_to_cpu(entry
->e_hash
),
2923 ext4_xattr_inode_free_quota(inode
, ea_inode
,
2924 le32_to_cpu(entry
->e_value_size
));
2930 ext4_xattr_release_block(handle
, inode
, bh
, ea_inode_array
,
2933 * Update i_file_acl value in the same transaction that releases
2936 EXT4_I(inode
)->i_file_acl
= 0;
2937 error
= ext4_mark_inode_dirty(handle
, inode
);
2939 EXT4_ERROR_INODE(inode
, "mark inode dirty (error %d)",
2951 void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array
*ea_inode_array
)
2955 if (ea_inode_array
== NULL
)
2958 for (idx
= 0; idx
< ea_inode_array
->count
; ++idx
)
2959 iput(ea_inode_array
->inodes
[idx
]);
2960 kfree(ea_inode_array
);
2964 * ext4_xattr_block_cache_insert()
2966 * Create a new entry in the extended attribute block cache, and insert
2967 * it unless such an entry is already in the cache.
2969 * Returns 0, or a negative error number on failure.
2972 ext4_xattr_block_cache_insert(struct mb_cache
*ea_block_cache
,
2973 struct buffer_head
*bh
)
2975 struct ext4_xattr_header
*header
= BHDR(bh
);
2976 __u32 hash
= le32_to_cpu(header
->h_hash
);
2977 int reusable
= le32_to_cpu(header
->h_refcount
) <
2978 EXT4_XATTR_REFCOUNT_MAX
;
2981 if (!ea_block_cache
)
2983 error
= mb_cache_entry_create(ea_block_cache
, GFP_NOFS
, hash
,
2984 bh
->b_blocknr
, reusable
);
2986 if (error
== -EBUSY
)
2987 ea_bdebug(bh
, "already in cache");
2989 ea_bdebug(bh
, "inserting [%x]", (int)hash
);
2995 * Compare two extended attribute blocks for equality.
2997 * Returns 0 if the blocks are equal, 1 if they differ, and
2998 * a negative error number on errors.
3001 ext4_xattr_cmp(struct ext4_xattr_header
*header1
,
3002 struct ext4_xattr_header
*header2
)
3004 struct ext4_xattr_entry
*entry1
, *entry2
;
3006 entry1
= ENTRY(header1
+1);
3007 entry2
= ENTRY(header2
+1);
3008 while (!IS_LAST_ENTRY(entry1
)) {
3009 if (IS_LAST_ENTRY(entry2
))
3011 if (entry1
->e_hash
!= entry2
->e_hash
||
3012 entry1
->e_name_index
!= entry2
->e_name_index
||
3013 entry1
->e_name_len
!= entry2
->e_name_len
||
3014 entry1
->e_value_size
!= entry2
->e_value_size
||
3015 entry1
->e_value_inum
!= entry2
->e_value_inum
||
3016 memcmp(entry1
->e_name
, entry2
->e_name
, entry1
->e_name_len
))
3018 if (!entry1
->e_value_inum
&&
3019 memcmp((char *)header1
+ le16_to_cpu(entry1
->e_value_offs
),
3020 (char *)header2
+ le16_to_cpu(entry2
->e_value_offs
),
3021 le32_to_cpu(entry1
->e_value_size
)))
3024 entry1
= EXT4_XATTR_NEXT(entry1
);
3025 entry2
= EXT4_XATTR_NEXT(entry2
);
3027 if (!IS_LAST_ENTRY(entry2
))
3033 * ext4_xattr_block_cache_find()
3035 * Find an identical extended attribute block.
3037 * Returns a pointer to the block found, or NULL if such a block was
3038 * not found or an error occurred.
3040 static struct buffer_head
*
3041 ext4_xattr_block_cache_find(struct inode
*inode
,
3042 struct ext4_xattr_header
*header
,
3043 struct mb_cache_entry
**pce
)
3045 __u32 hash
= le32_to_cpu(header
->h_hash
);
3046 struct mb_cache_entry
*ce
;
3047 struct mb_cache
*ea_block_cache
= EA_BLOCK_CACHE(inode
);
3049 if (!ea_block_cache
)
3051 if (!header
->h_hash
)
3052 return NULL
; /* never share */
3053 ea_idebug(inode
, "looking for cached blocks [%x]", (int)hash
);
3054 ce
= mb_cache_entry_find_first(ea_block_cache
, hash
);
3056 struct buffer_head
*bh
;
3058 bh
= ext4_sb_bread(inode
->i_sb
, ce
->e_value
, REQ_PRIO
);
3060 if (PTR_ERR(bh
) == -ENOMEM
)
3062 EXT4_ERROR_INODE(inode
, "block %lu read error",
3063 (unsigned long)ce
->e_value
);
3064 } else if (ext4_xattr_cmp(header
, BHDR(bh
)) == 0) {
3069 ce
= mb_cache_entry_find_next(ea_block_cache
, ce
);
3074 #define NAME_HASH_SHIFT 5
3075 #define VALUE_HASH_SHIFT 16
3078 * ext4_xattr_hash_entry()
3080 * Compute the hash of an extended attribute.
3082 static __le32
ext4_xattr_hash_entry(char *name
, size_t name_len
, __le32
*value
,
3087 while (name_len
--) {
3088 hash
= (hash
<< NAME_HASH_SHIFT
) ^
3089 (hash
>> (8*sizeof(hash
) - NAME_HASH_SHIFT
)) ^
3092 while (value_count
--) {
3093 hash
= (hash
<< VALUE_HASH_SHIFT
) ^
3094 (hash
>> (8*sizeof(hash
) - VALUE_HASH_SHIFT
)) ^
3095 le32_to_cpu(*value
++);
3097 return cpu_to_le32(hash
);
3100 #undef NAME_HASH_SHIFT
3101 #undef VALUE_HASH_SHIFT
3103 #define BLOCK_HASH_SHIFT 16
3106 * ext4_xattr_rehash()
3108 * Re-compute the extended attribute hash value after an entry has changed.
3110 static void ext4_xattr_rehash(struct ext4_xattr_header
*header
)
3112 struct ext4_xattr_entry
*here
;
3115 here
= ENTRY(header
+1);
3116 while (!IS_LAST_ENTRY(here
)) {
3117 if (!here
->e_hash
) {
3118 /* Block is not shared if an entry's hash value == 0 */
3122 hash
= (hash
<< BLOCK_HASH_SHIFT
) ^
3123 (hash
>> (8*sizeof(hash
) - BLOCK_HASH_SHIFT
)) ^
3124 le32_to_cpu(here
->e_hash
);
3125 here
= EXT4_XATTR_NEXT(here
);
3127 header
->h_hash
= cpu_to_le32(hash
);
3130 #undef BLOCK_HASH_SHIFT
3132 #define HASH_BUCKET_BITS 10
3135 ext4_xattr_create_cache(void)
3137 return mb_cache_create(HASH_BUCKET_BITS
);
3140 void ext4_xattr_destroy_cache(struct mb_cache
*cache
)
3143 mb_cache_destroy(cache
);