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 __le32
ext4_xattr_hash_entry_signed(char *name
, size_t name_len
, __le32
*value
,
86 static void ext4_xattr_rehash(struct ext4_xattr_header
*);
88 static const struct xattr_handler
* const ext4_xattr_handler_map
[] = {
89 [EXT4_XATTR_INDEX_USER
] = &ext4_xattr_user_handler
,
90 #ifdef CONFIG_EXT4_FS_POSIX_ACL
91 [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS
] = &nop_posix_acl_access
,
92 [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT
] = &nop_posix_acl_default
,
94 [EXT4_XATTR_INDEX_TRUSTED
] = &ext4_xattr_trusted_handler
,
95 #ifdef CONFIG_EXT4_FS_SECURITY
96 [EXT4_XATTR_INDEX_SECURITY
] = &ext4_xattr_security_handler
,
98 [EXT4_XATTR_INDEX_HURD
] = &ext4_xattr_hurd_handler
,
101 const struct xattr_handler
*ext4_xattr_handlers
[] = {
102 &ext4_xattr_user_handler
,
103 &ext4_xattr_trusted_handler
,
104 #ifdef CONFIG_EXT4_FS_SECURITY
105 &ext4_xattr_security_handler
,
107 &ext4_xattr_hurd_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 char *ext4_xattr_prefix(int name_index
,
173 struct dentry
*dentry
)
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
];
180 if (!xattr_handler_can_list(handler
, dentry
))
183 return xattr_prefix(handler
);
187 check_xattrs(struct inode
*inode
, struct buffer_head
*bh
,
188 struct ext4_xattr_entry
*entry
, void *end
, void *value_start
,
189 const char *function
, unsigned int line
)
191 struct ext4_xattr_entry
*e
= entry
;
192 int err
= -EFSCORRUPTED
;
196 if (BHDR(bh
)->h_magic
!= cpu_to_le32(EXT4_XATTR_MAGIC
) ||
197 BHDR(bh
)->h_blocks
!= cpu_to_le32(1)) {
198 err_str
= "invalid header";
201 if (buffer_verified(bh
))
203 if (!ext4_xattr_block_csum_verify(inode
, bh
)) {
205 err_str
= "invalid checksum";
209 struct ext4_xattr_ibody_header
*header
= value_start
;
212 if (end
- (void *)header
< sizeof(*header
) + sizeof(u32
)) {
213 err_str
= "in-inode xattr block too small";
216 if (header
->h_magic
!= cpu_to_le32(EXT4_XATTR_MAGIC
)) {
217 err_str
= "bad magic number in in-inode xattr";
222 /* Find the end of the names list */
223 while (!IS_LAST_ENTRY(e
)) {
224 struct ext4_xattr_entry
*next
= EXT4_XATTR_NEXT(e
);
225 if ((void *)next
>= end
) {
226 err_str
= "e_name out of bounds";
229 if (strnlen(e
->e_name
, e
->e_name_len
) != e
->e_name_len
) {
230 err_str
= "bad e_name length";
236 /* Check the values */
237 while (!IS_LAST_ENTRY(entry
)) {
238 u32 size
= le32_to_cpu(entry
->e_value_size
);
239 unsigned long ea_ino
= le32_to_cpu(entry
->e_value_inum
);
241 if (!ext4_has_feature_ea_inode(inode
->i_sb
) && ea_ino
) {
242 err_str
= "ea_inode specified without ea_inode feature enabled";
245 if (ea_ino
&& ((ea_ino
== EXT4_ROOT_INO
) ||
246 !ext4_valid_inum(inode
->i_sb
, ea_ino
))) {
247 err_str
= "invalid ea_ino";
250 if (size
> EXT4_XATTR_SIZE_MAX
) {
251 err_str
= "e_value size too large";
255 if (size
!= 0 && entry
->e_value_inum
== 0) {
256 u16 offs
= le16_to_cpu(entry
->e_value_offs
);
260 * The value cannot overlap the names, and the value
261 * with padding cannot extend beyond 'end'. Check both
262 * the padded and unpadded sizes, since the size may
263 * overflow to 0 when adding padding.
265 if (offs
> end
- value_start
) {
266 err_str
= "e_value out of bounds";
269 value
= value_start
+ offs
;
270 if (value
< (void *)e
+ sizeof(u32
) ||
271 size
> end
- value
||
272 EXT4_XATTR_SIZE(size
) > end
- value
) {
273 err_str
= "overlapping e_value ";
277 entry
= EXT4_XATTR_NEXT(entry
);
280 set_buffer_verified(bh
);
285 __ext4_error_inode(inode
, function
, line
, 0, -err
,
286 "corrupted xattr block %llu: %s",
287 (unsigned long long) bh
->b_blocknr
,
290 __ext4_error_inode(inode
, function
, line
, 0, -err
,
291 "corrupted in-inode xattr: %s", err_str
);
296 __ext4_xattr_check_block(struct inode
*inode
, struct buffer_head
*bh
,
297 const char *function
, unsigned int line
)
299 return check_xattrs(inode
, bh
, BFIRST(bh
), bh
->b_data
+ bh
->b_size
,
300 bh
->b_data
, function
, line
);
303 #define ext4_xattr_check_block(inode, bh) \
304 __ext4_xattr_check_block((inode), (bh), __func__, __LINE__)
308 __xattr_check_inode(struct inode
*inode
, struct ext4_xattr_ibody_header
*header
,
309 void *end
, const char *function
, unsigned int line
)
311 return check_xattrs(inode
, NULL
, IFIRST(header
), end
, IFIRST(header
),
315 #define xattr_check_inode(inode, header, end) \
316 __xattr_check_inode((inode), (header), (end), __func__, __LINE__)
319 xattr_find_entry(struct inode
*inode
, struct ext4_xattr_entry
**pentry
,
320 void *end
, int name_index
, const char *name
, int sorted
)
322 struct ext4_xattr_entry
*entry
, *next
;
328 name_len
= strlen(name
);
329 for (entry
= *pentry
; !IS_LAST_ENTRY(entry
); entry
= next
) {
330 next
= EXT4_XATTR_NEXT(entry
);
331 if ((void *) next
>= end
) {
332 EXT4_ERROR_INODE(inode
, "corrupted xattr entries");
333 return -EFSCORRUPTED
;
335 cmp
= name_index
- entry
->e_name_index
;
337 cmp
= name_len
- entry
->e_name_len
;
339 cmp
= memcmp(name
, entry
->e_name
, name_len
);
340 if (cmp
<= 0 && (sorted
|| cmp
== 0))
344 return cmp
? -ENODATA
: 0;
348 ext4_xattr_inode_hash(struct ext4_sb_info
*sbi
, const void *buffer
, size_t size
)
350 return ext4_chksum(sbi
, sbi
->s_csum_seed
, buffer
, size
);
353 static u64
ext4_xattr_inode_get_ref(struct inode
*ea_inode
)
355 return ((u64
)ea_inode
->i_ctime
.tv_sec
<< 32) |
356 (u32
) inode_peek_iversion_raw(ea_inode
);
359 static void ext4_xattr_inode_set_ref(struct inode
*ea_inode
, u64 ref_count
)
361 ea_inode
->i_ctime
.tv_sec
= (u32
)(ref_count
>> 32);
362 inode_set_iversion_raw(ea_inode
, ref_count
& 0xffffffff);
365 static u32
ext4_xattr_inode_get_hash(struct inode
*ea_inode
)
367 return (u32
)ea_inode
->i_atime
.tv_sec
;
370 static void ext4_xattr_inode_set_hash(struct inode
*ea_inode
, u32 hash
)
372 ea_inode
->i_atime
.tv_sec
= hash
;
376 * Read the EA value from an inode.
378 static int ext4_xattr_inode_read(struct inode
*ea_inode
, void *buf
, size_t size
)
380 int blocksize
= 1 << ea_inode
->i_blkbits
;
381 int bh_count
= (size
+ blocksize
- 1) >> ea_inode
->i_blkbits
;
382 int tail_size
= (size
% blocksize
) ?: blocksize
;
383 struct buffer_head
*bhs_inline
[8];
384 struct buffer_head
**bhs
= bhs_inline
;
387 if (bh_count
> ARRAY_SIZE(bhs_inline
)) {
388 bhs
= kmalloc_array(bh_count
, sizeof(*bhs
), GFP_NOFS
);
393 ret
= ext4_bread_batch(ea_inode
, 0 /* block */, bh_count
,
394 true /* wait */, bhs
);
398 for (i
= 0; i
< bh_count
; i
++) {
399 /* There shouldn't be any holes in ea_inode. */
404 memcpy((char *)buf
+ blocksize
* i
, bhs
[i
]->b_data
,
405 i
< bh_count
- 1 ? blocksize
: tail_size
);
409 for (i
= 0; i
< bh_count
; i
++)
412 if (bhs
!= bhs_inline
)
417 #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec)
419 static int ext4_xattr_inode_iget(struct inode
*parent
, unsigned long ea_ino
,
420 u32 ea_inode_hash
, struct inode
**ea_inode
)
426 * We have to check for this corruption early as otherwise
427 * iget_locked() could wait indefinitely for the state of our
430 if (parent
->i_ino
== ea_ino
) {
431 ext4_error(parent
->i_sb
,
432 "Parent and EA inode have the same ino %lu", ea_ino
);
433 return -EFSCORRUPTED
;
436 inode
= ext4_iget(parent
->i_sb
, ea_ino
, EXT4_IGET_NORMAL
);
438 err
= PTR_ERR(inode
);
439 ext4_error(parent
->i_sb
,
440 "error while reading EA inode %lu err=%d", ea_ino
,
445 if (is_bad_inode(inode
)) {
446 ext4_error(parent
->i_sb
,
447 "error while reading EA inode %lu is_bad_inode",
453 if (!(EXT4_I(inode
)->i_flags
& EXT4_EA_INODE_FL
)) {
454 ext4_error(parent
->i_sb
,
455 "EA inode %lu does not have EXT4_EA_INODE_FL flag",
461 ext4_xattr_inode_set_class(inode
);
464 * Check whether this is an old Lustre-style xattr inode. Lustre
465 * implementation does not have hash validation, rather it has a
466 * backpointer from ea_inode to the parent inode.
468 if (ea_inode_hash
!= ext4_xattr_inode_get_hash(inode
) &&
469 EXT4_XATTR_INODE_GET_PARENT(inode
) == parent
->i_ino
&&
470 inode
->i_generation
== parent
->i_generation
) {
471 ext4_set_inode_state(inode
, EXT4_STATE_LUSTRE_EA_INODE
);
472 ext4_xattr_inode_set_ref(inode
, 1);
475 inode
->i_flags
|= S_NOQUOTA
;
486 /* Remove entry from mbcache when EA inode is getting evicted */
487 void ext4_evict_ea_inode(struct inode
*inode
)
489 struct mb_cache_entry
*oe
;
491 if (!EA_INODE_CACHE(inode
))
493 /* Wait for entry to get unused so that we can remove it */
494 while ((oe
= mb_cache_entry_delete_or_get(EA_INODE_CACHE(inode
),
495 ext4_xattr_inode_get_hash(inode
), inode
->i_ino
))) {
496 mb_cache_entry_wait_unused(oe
);
497 mb_cache_entry_put(EA_INODE_CACHE(inode
), oe
);
502 ext4_xattr_inode_verify_hashes(struct inode
*ea_inode
,
503 struct ext4_xattr_entry
*entry
, void *buffer
,
508 /* Verify stored hash matches calculated hash. */
509 hash
= ext4_xattr_inode_hash(EXT4_SB(ea_inode
->i_sb
), buffer
, size
);
510 if (hash
!= ext4_xattr_inode_get_hash(ea_inode
))
511 return -EFSCORRUPTED
;
514 __le32 e_hash
, tmp_data
;
516 /* Verify entry hash. */
517 tmp_data
= cpu_to_le32(hash
);
518 e_hash
= ext4_xattr_hash_entry(entry
->e_name
, entry
->e_name_len
,
521 if (e_hash
== entry
->e_hash
)
525 * Not good. Maybe the entry hash was calculated
526 * using the buggy signed char version?
528 e_hash
= ext4_xattr_hash_entry_signed(entry
->e_name
, entry
->e_name_len
,
530 /* Still no match - bad */
531 if (e_hash
!= entry
->e_hash
)
532 return -EFSCORRUPTED
;
534 /* Let people know about old hash */
535 pr_warn_once("ext4: filesystem with signed xattr name hash");
541 * Read xattr value from the EA inode.
544 ext4_xattr_inode_get(struct inode
*inode
, struct ext4_xattr_entry
*entry
,
545 void *buffer
, size_t size
)
547 struct mb_cache
*ea_inode_cache
= EA_INODE_CACHE(inode
);
548 struct inode
*ea_inode
;
551 err
= ext4_xattr_inode_iget(inode
, le32_to_cpu(entry
->e_value_inum
),
552 le32_to_cpu(entry
->e_hash
), &ea_inode
);
558 if (i_size_read(ea_inode
) != size
) {
559 ext4_warning_inode(ea_inode
,
560 "ea_inode file size=%llu entry size=%zu",
561 i_size_read(ea_inode
), size
);
566 err
= ext4_xattr_inode_read(ea_inode
, buffer
, size
);
570 if (!ext4_test_inode_state(ea_inode
, EXT4_STATE_LUSTRE_EA_INODE
)) {
571 err
= ext4_xattr_inode_verify_hashes(ea_inode
, entry
, buffer
,
574 ext4_warning_inode(ea_inode
,
575 "EA inode hash validation failed");
580 mb_cache_entry_create(ea_inode_cache
, GFP_NOFS
,
581 ext4_xattr_inode_get_hash(ea_inode
),
582 ea_inode
->i_ino
, true /* reusable */);
590 ext4_xattr_block_get(struct inode
*inode
, int name_index
, const char *name
,
591 void *buffer
, size_t buffer_size
)
593 struct buffer_head
*bh
= NULL
;
594 struct ext4_xattr_entry
*entry
;
598 struct mb_cache
*ea_block_cache
= EA_BLOCK_CACHE(inode
);
600 ea_idebug(inode
, "name=%d.%s, buffer=%p, buffer_size=%ld",
601 name_index
, name
, buffer
, (long)buffer_size
);
603 if (!EXT4_I(inode
)->i_file_acl
)
605 ea_idebug(inode
, "reading block %llu",
606 (unsigned long long)EXT4_I(inode
)->i_file_acl
);
607 bh
= ext4_sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
, REQ_PRIO
);
610 ea_bdebug(bh
, "b_count=%d, refcount=%d",
611 atomic_read(&(bh
->b_count
)), le32_to_cpu(BHDR(bh
)->h_refcount
));
612 error
= ext4_xattr_check_block(inode
, bh
);
615 ext4_xattr_block_cache_insert(ea_block_cache
, bh
);
617 end
= bh
->b_data
+ bh
->b_size
;
618 error
= xattr_find_entry(inode
, &entry
, end
, name_index
, name
, 1);
621 size
= le32_to_cpu(entry
->e_value_size
);
623 if (unlikely(size
> EXT4_XATTR_SIZE_MAX
))
626 if (size
> buffer_size
)
628 if (entry
->e_value_inum
) {
629 error
= ext4_xattr_inode_get(inode
, entry
, buffer
,
634 u16 offset
= le16_to_cpu(entry
->e_value_offs
);
635 void *p
= bh
->b_data
+ offset
;
637 if (unlikely(p
+ size
> end
))
639 memcpy(buffer
, p
, size
);
650 ext4_xattr_ibody_get(struct inode
*inode
, int name_index
, const char *name
,
651 void *buffer
, size_t buffer_size
)
653 struct ext4_xattr_ibody_header
*header
;
654 struct ext4_xattr_entry
*entry
;
655 struct ext4_inode
*raw_inode
;
656 struct ext4_iloc iloc
;
661 if (!ext4_test_inode_state(inode
, EXT4_STATE_XATTR
))
663 error
= ext4_get_inode_loc(inode
, &iloc
);
666 raw_inode
= ext4_raw_inode(&iloc
);
667 header
= IHDR(inode
, raw_inode
);
668 end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
669 error
= xattr_check_inode(inode
, header
, end
);
672 entry
= IFIRST(header
);
673 error
= xattr_find_entry(inode
, &entry
, end
, name_index
, name
, 0);
676 size
= le32_to_cpu(entry
->e_value_size
);
678 if (unlikely(size
> EXT4_XATTR_SIZE_MAX
))
681 if (size
> buffer_size
)
683 if (entry
->e_value_inum
) {
684 error
= ext4_xattr_inode_get(inode
, entry
, buffer
,
689 u16 offset
= le16_to_cpu(entry
->e_value_offs
);
690 void *p
= (void *)IFIRST(header
) + offset
;
692 if (unlikely(p
+ size
> end
))
694 memcpy(buffer
, p
, size
);
707 * Copy an extended attribute into the buffer
708 * provided, or compute the buffer size required.
709 * Buffer is NULL to compute the size of the buffer required.
711 * Returns a negative error number on failure, or the number of bytes
712 * used / required on success.
715 ext4_xattr_get(struct inode
*inode
, int name_index
, const char *name
,
716 void *buffer
, size_t buffer_size
)
720 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
723 if (strlen(name
) > 255)
726 down_read(&EXT4_I(inode
)->xattr_sem
);
727 error
= ext4_xattr_ibody_get(inode
, name_index
, name
, buffer
,
729 if (error
== -ENODATA
)
730 error
= ext4_xattr_block_get(inode
, name_index
, name
, buffer
,
732 up_read(&EXT4_I(inode
)->xattr_sem
);
737 ext4_xattr_list_entries(struct dentry
*dentry
, struct ext4_xattr_entry
*entry
,
738 char *buffer
, size_t buffer_size
)
740 size_t rest
= buffer_size
;
742 for (; !IS_LAST_ENTRY(entry
); entry
= EXT4_XATTR_NEXT(entry
)) {
745 prefix
= ext4_xattr_prefix(entry
->e_name_index
, dentry
);
747 size_t prefix_len
= strlen(prefix
);
748 size_t size
= prefix_len
+ entry
->e_name_len
+ 1;
753 memcpy(buffer
, prefix
, prefix_len
);
754 buffer
+= prefix_len
;
755 memcpy(buffer
, entry
->e_name
, entry
->e_name_len
);
756 buffer
+= entry
->e_name_len
;
762 return buffer_size
- rest
; /* total size */
766 ext4_xattr_block_list(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
768 struct inode
*inode
= d_inode(dentry
);
769 struct buffer_head
*bh
= NULL
;
772 ea_idebug(inode
, "buffer=%p, buffer_size=%ld",
773 buffer
, (long)buffer_size
);
775 if (!EXT4_I(inode
)->i_file_acl
)
777 ea_idebug(inode
, "reading block %llu",
778 (unsigned long long)EXT4_I(inode
)->i_file_acl
);
779 bh
= ext4_sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
, REQ_PRIO
);
782 ea_bdebug(bh
, "b_count=%d, refcount=%d",
783 atomic_read(&(bh
->b_count
)), le32_to_cpu(BHDR(bh
)->h_refcount
));
784 error
= ext4_xattr_check_block(inode
, bh
);
787 ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode
), bh
);
788 error
= ext4_xattr_list_entries(dentry
, BFIRST(bh
), buffer
,
796 ext4_xattr_ibody_list(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
798 struct inode
*inode
= d_inode(dentry
);
799 struct ext4_xattr_ibody_header
*header
;
800 struct ext4_inode
*raw_inode
;
801 struct ext4_iloc iloc
;
805 if (!ext4_test_inode_state(inode
, EXT4_STATE_XATTR
))
807 error
= ext4_get_inode_loc(inode
, &iloc
);
810 raw_inode
= ext4_raw_inode(&iloc
);
811 header
= IHDR(inode
, raw_inode
);
812 end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
813 error
= xattr_check_inode(inode
, header
, end
);
816 error
= ext4_xattr_list_entries(dentry
, IFIRST(header
),
817 buffer
, buffer_size
);
825 * Inode operation listxattr()
827 * d_inode(dentry)->i_rwsem: don't care
829 * Copy a list of attribute names into the buffer
830 * provided, or compute the buffer size required.
831 * Buffer is NULL to compute the size of the buffer required.
833 * Returns a negative error number on failure, or the number of bytes
834 * used / required on success.
837 ext4_listxattr(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
841 down_read(&EXT4_I(d_inode(dentry
))->xattr_sem
);
842 ret
= ret2
= ext4_xattr_ibody_list(dentry
, buffer
, buffer_size
);
849 ret
= ext4_xattr_block_list(dentry
, buffer
, buffer_size
);
854 up_read(&EXT4_I(d_inode(dentry
))->xattr_sem
);
859 * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is
862 static void ext4_xattr_update_super_block(handle_t
*handle
,
863 struct super_block
*sb
)
865 if (ext4_has_feature_xattr(sb
))
868 BUFFER_TRACE(EXT4_SB(sb
)->s_sbh
, "get_write_access");
869 if (ext4_journal_get_write_access(handle
, sb
, EXT4_SB(sb
)->s_sbh
,
870 EXT4_JTR_NONE
) == 0) {
871 lock_buffer(EXT4_SB(sb
)->s_sbh
);
872 ext4_set_feature_xattr(sb
);
873 ext4_superblock_csum_set(sb
);
874 unlock_buffer(EXT4_SB(sb
)->s_sbh
);
875 ext4_handle_dirty_metadata(handle
, NULL
, EXT4_SB(sb
)->s_sbh
);
879 int ext4_get_inode_usage(struct inode
*inode
, qsize_t
*usage
)
881 struct ext4_iloc iloc
= { .bh
= NULL
};
882 struct buffer_head
*bh
= NULL
;
883 struct ext4_inode
*raw_inode
;
884 struct ext4_xattr_ibody_header
*header
;
885 struct ext4_xattr_entry
*entry
;
886 qsize_t ea_inode_refs
= 0;
890 lockdep_assert_held_read(&EXT4_I(inode
)->xattr_sem
);
892 if (ext4_test_inode_state(inode
, EXT4_STATE_XATTR
)) {
893 ret
= ext4_get_inode_loc(inode
, &iloc
);
896 raw_inode
= ext4_raw_inode(&iloc
);
897 header
= IHDR(inode
, raw_inode
);
898 end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
899 ret
= xattr_check_inode(inode
, header
, end
);
903 for (entry
= IFIRST(header
); !IS_LAST_ENTRY(entry
);
904 entry
= EXT4_XATTR_NEXT(entry
))
905 if (entry
->e_value_inum
)
909 if (EXT4_I(inode
)->i_file_acl
) {
910 bh
= ext4_sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
, REQ_PRIO
);
917 ret
= ext4_xattr_check_block(inode
, bh
);
921 for (entry
= BFIRST(bh
); !IS_LAST_ENTRY(entry
);
922 entry
= EXT4_XATTR_NEXT(entry
))
923 if (entry
->e_value_inum
)
926 *usage
= ea_inode_refs
+ 1;
934 static inline size_t round_up_cluster(struct inode
*inode
, size_t length
)
936 struct super_block
*sb
= inode
->i_sb
;
937 size_t cluster_size
= 1 << (EXT4_SB(sb
)->s_cluster_bits
+
939 size_t mask
= ~(cluster_size
- 1);
941 return (length
+ cluster_size
- 1) & mask
;
944 static int ext4_xattr_inode_alloc_quota(struct inode
*inode
, size_t len
)
948 err
= dquot_alloc_inode(inode
);
951 err
= dquot_alloc_space_nodirty(inode
, round_up_cluster(inode
, len
));
953 dquot_free_inode(inode
);
957 static void ext4_xattr_inode_free_quota(struct inode
*parent
,
958 struct inode
*ea_inode
,
962 ext4_test_inode_state(ea_inode
, EXT4_STATE_LUSTRE_EA_INODE
))
964 dquot_free_space_nodirty(parent
, round_up_cluster(parent
, len
));
965 dquot_free_inode(parent
);
968 int __ext4_xattr_set_credits(struct super_block
*sb
, struct inode
*inode
,
969 struct buffer_head
*block_bh
, size_t value_len
,
976 * 1) Owner inode update
977 * 2) Ref count update on old xattr block
979 * 4) block bitmap update for new xattr block
980 * 5) group descriptor for new xattr block
981 * 6) block bitmap update for old xattr block
982 * 7) group descriptor for old block
984 * 6 & 7 can happen if we have two racing threads T_a and T_b
985 * which are each trying to set an xattr on inodes I_a and I_b
986 * which were both initially sharing an xattr block.
991 credits
+= EXT4_MAXQUOTAS_TRANS_BLOCKS(sb
);
994 * In case of inline data, we may push out the data to a block,
995 * so we need to reserve credits for this eventuality
997 if (inode
&& ext4_has_inline_data(inode
))
998 credits
+= ext4_writepage_trans_blocks(inode
) + 1;
1000 /* We are done if ea_inode feature is not enabled. */
1001 if (!ext4_has_feature_ea_inode(sb
))
1004 /* New ea_inode, inode map, block bitmap, group descriptor. */
1008 blocks
= (value_len
+ sb
->s_blocksize
- 1) >> sb
->s_blocksize_bits
;
1010 /* Indirection block or one level of extent tree. */
1013 /* Block bitmap and group descriptor updates for each block. */
1014 credits
+= blocks
* 2;
1016 /* Blocks themselves. */
1020 /* Dereference ea_inode holding old xattr value.
1021 * Old ea_inode, inode map, block bitmap, group descriptor.
1025 /* Data blocks for old ea_inode. */
1026 blocks
= XATTR_SIZE_MAX
>> sb
->s_blocksize_bits
;
1028 /* Indirection block or one level of extent tree for old
1033 /* Block bitmap and group descriptor updates for each block. */
1034 credits
+= blocks
* 2;
1037 /* We may need to clone the existing xattr block in which case we need
1038 * to increment ref counts for existing ea_inodes referenced by it.
1041 struct ext4_xattr_entry
*entry
= BFIRST(block_bh
);
1043 for (; !IS_LAST_ENTRY(entry
); entry
= EXT4_XATTR_NEXT(entry
))
1044 if (entry
->e_value_inum
)
1045 /* Ref count update on ea_inode. */
1051 static int ext4_xattr_inode_update_ref(handle_t
*handle
, struct inode
*ea_inode
,
1054 struct ext4_iloc iloc
;
1058 inode_lock(ea_inode
);
1060 ret
= ext4_reserve_inode_write(handle
, ea_inode
, &iloc
);
1064 ref_count
= ext4_xattr_inode_get_ref(ea_inode
);
1065 ref_count
+= ref_change
;
1066 ext4_xattr_inode_set_ref(ea_inode
, ref_count
);
1068 if (ref_change
> 0) {
1069 WARN_ONCE(ref_count
<= 0, "EA inode %lu ref_count=%lld",
1070 ea_inode
->i_ino
, ref_count
);
1072 if (ref_count
== 1) {
1073 WARN_ONCE(ea_inode
->i_nlink
, "EA inode %lu i_nlink=%u",
1074 ea_inode
->i_ino
, ea_inode
->i_nlink
);
1076 set_nlink(ea_inode
, 1);
1077 ext4_orphan_del(handle
, ea_inode
);
1080 WARN_ONCE(ref_count
< 0, "EA inode %lu ref_count=%lld",
1081 ea_inode
->i_ino
, ref_count
);
1083 if (ref_count
== 0) {
1084 WARN_ONCE(ea_inode
->i_nlink
!= 1,
1085 "EA inode %lu i_nlink=%u",
1086 ea_inode
->i_ino
, ea_inode
->i_nlink
);
1088 clear_nlink(ea_inode
);
1089 ext4_orphan_add(handle
, ea_inode
);
1093 ret
= ext4_mark_iloc_dirty(handle
, ea_inode
, &iloc
);
1095 ext4_warning_inode(ea_inode
,
1096 "ext4_mark_iloc_dirty() failed ret=%d", ret
);
1098 inode_unlock(ea_inode
);
1102 static int ext4_xattr_inode_inc_ref(handle_t
*handle
, struct inode
*ea_inode
)
1104 return ext4_xattr_inode_update_ref(handle
, ea_inode
, 1);
1107 static int ext4_xattr_inode_dec_ref(handle_t
*handle
, struct inode
*ea_inode
)
1109 return ext4_xattr_inode_update_ref(handle
, ea_inode
, -1);
1112 static int ext4_xattr_inode_inc_ref_all(handle_t
*handle
, struct inode
*parent
,
1113 struct ext4_xattr_entry
*first
)
1115 struct inode
*ea_inode
;
1116 struct ext4_xattr_entry
*entry
;
1117 struct ext4_xattr_entry
*failed_entry
;
1118 unsigned int ea_ino
;
1121 for (entry
= first
; !IS_LAST_ENTRY(entry
);
1122 entry
= EXT4_XATTR_NEXT(entry
)) {
1123 if (!entry
->e_value_inum
)
1125 ea_ino
= le32_to_cpu(entry
->e_value_inum
);
1126 err
= ext4_xattr_inode_iget(parent
, ea_ino
,
1127 le32_to_cpu(entry
->e_hash
),
1131 err
= ext4_xattr_inode_inc_ref(handle
, ea_inode
);
1133 ext4_warning_inode(ea_inode
, "inc ref error %d", err
);
1143 failed_entry
= entry
;
1145 for (entry
= first
; entry
!= failed_entry
;
1146 entry
= EXT4_XATTR_NEXT(entry
)) {
1147 if (!entry
->e_value_inum
)
1149 ea_ino
= le32_to_cpu(entry
->e_value_inum
);
1150 err
= ext4_xattr_inode_iget(parent
, ea_ino
,
1151 le32_to_cpu(entry
->e_hash
),
1154 ext4_warning(parent
->i_sb
,
1155 "cleanup ea_ino %u iget error %d", ea_ino
,
1159 err
= ext4_xattr_inode_dec_ref(handle
, ea_inode
);
1161 ext4_warning_inode(ea_inode
, "cleanup dec ref error %d",
1168 static int ext4_xattr_restart_fn(handle_t
*handle
, struct inode
*inode
,
1169 struct buffer_head
*bh
, bool block_csum
, bool dirty
)
1175 ext4_xattr_block_csum_set(inode
, bh
);
1176 error
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
1178 ext4_warning(inode
->i_sb
, "Handle metadata (error %d)",
1187 ext4_xattr_inode_dec_ref_all(handle_t
*handle
, struct inode
*parent
,
1188 struct buffer_head
*bh
,
1189 struct ext4_xattr_entry
*first
, bool block_csum
,
1190 struct ext4_xattr_inode_array
**ea_inode_array
,
1191 int extra_credits
, bool skip_quota
)
1193 struct inode
*ea_inode
;
1194 struct ext4_xattr_entry
*entry
;
1196 unsigned int ea_ino
;
1200 /* One credit for dec ref on ea_inode, one for orphan list addition, */
1201 credits
= 2 + extra_credits
;
1203 for (entry
= first
; !IS_LAST_ENTRY(entry
);
1204 entry
= EXT4_XATTR_NEXT(entry
)) {
1205 if (!entry
->e_value_inum
)
1207 ea_ino
= le32_to_cpu(entry
->e_value_inum
);
1208 err
= ext4_xattr_inode_iget(parent
, ea_ino
,
1209 le32_to_cpu(entry
->e_hash
),
1214 err
= ext4_expand_inode_array(ea_inode_array
, ea_inode
);
1216 ext4_warning_inode(ea_inode
,
1217 "Expand inode array err=%d", err
);
1222 err
= ext4_journal_ensure_credits_fn(handle
, credits
, credits
,
1223 ext4_free_metadata_revoke_credits(parent
->i_sb
, 1),
1224 ext4_xattr_restart_fn(handle
, parent
, bh
, block_csum
,
1227 ext4_warning_inode(ea_inode
, "Ensure credits err=%d",
1232 err
= ext4_journal_get_write_access(handle
,
1233 parent
->i_sb
, bh
, EXT4_JTR_NONE
);
1235 ext4_warning_inode(ea_inode
,
1236 "Re-get write access err=%d",
1242 err
= ext4_xattr_inode_dec_ref(handle
, ea_inode
);
1244 ext4_warning_inode(ea_inode
, "ea_inode dec ref err=%d",
1250 ext4_xattr_inode_free_quota(parent
, ea_inode
,
1251 le32_to_cpu(entry
->e_value_size
));
1254 * Forget about ea_inode within the same transaction that
1255 * decrements the ref count. This avoids duplicate decrements in
1256 * case the rest of the work spills over to subsequent
1259 entry
->e_value_inum
= 0;
1260 entry
->e_value_size
= 0;
1267 * Note that we are deliberately skipping csum calculation for
1268 * the final update because we do not expect any journal
1269 * restarts until xattr block is freed.
1272 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
1274 ext4_warning_inode(parent
,
1275 "handle dirty metadata err=%d", err
);
1280 * Release the xattr block BH: If the reference count is > 1, decrement it;
1281 * otherwise free the block.
1284 ext4_xattr_release_block(handle_t
*handle
, struct inode
*inode
,
1285 struct buffer_head
*bh
,
1286 struct ext4_xattr_inode_array
**ea_inode_array
,
1289 struct mb_cache
*ea_block_cache
= EA_BLOCK_CACHE(inode
);
1293 BUFFER_TRACE(bh
, "get_write_access");
1294 error
= ext4_journal_get_write_access(handle
, inode
->i_sb
, bh
,
1301 hash
= le32_to_cpu(BHDR(bh
)->h_hash
);
1302 ref
= le32_to_cpu(BHDR(bh
)->h_refcount
);
1304 ea_bdebug(bh
, "refcount now=0; freeing");
1306 * This must happen under buffer lock for
1307 * ext4_xattr_block_set() to reliably detect freed block
1309 if (ea_block_cache
) {
1310 struct mb_cache_entry
*oe
;
1312 oe
= mb_cache_entry_delete_or_get(ea_block_cache
, hash
,
1316 mb_cache_entry_wait_unused(oe
);
1317 mb_cache_entry_put(ea_block_cache
, oe
);
1324 if (ext4_has_feature_ea_inode(inode
->i_sb
))
1325 ext4_xattr_inode_dec_ref_all(handle
, inode
, bh
,
1327 true /* block_csum */,
1330 true /* skip_quota */);
1331 ext4_free_blocks(handle
, inode
, bh
, 0, 1,
1332 EXT4_FREE_BLOCKS_METADATA
|
1333 EXT4_FREE_BLOCKS_FORGET
);
1336 BHDR(bh
)->h_refcount
= cpu_to_le32(ref
);
1337 if (ref
== EXT4_XATTR_REFCOUNT_MAX
- 1) {
1338 struct mb_cache_entry
*ce
;
1340 if (ea_block_cache
) {
1341 ce
= mb_cache_entry_get(ea_block_cache
, hash
,
1344 set_bit(MBE_REUSABLE_B
, &ce
->e_flags
);
1345 mb_cache_entry_put(ea_block_cache
, ce
);
1350 ext4_xattr_block_csum_set(inode
, bh
);
1352 * Beware of this ugliness: Releasing of xattr block references
1353 * from different inodes can race and so we have to protect
1354 * from a race where someone else frees the block (and releases
1355 * its journal_head) before we are done dirtying the buffer. In
1356 * nojournal mode this race is harmless and we actually cannot
1357 * call ext4_handle_dirty_metadata() with locked buffer as
1358 * that function can call sync_dirty_buffer() so for that case
1359 * we handle the dirtying after unlocking the buffer.
1361 if (ext4_handle_valid(handle
))
1362 error
= ext4_handle_dirty_metadata(handle
, inode
, bh
);
1364 if (!ext4_handle_valid(handle
))
1365 error
= ext4_handle_dirty_metadata(handle
, inode
, bh
);
1367 ext4_handle_sync(handle
);
1368 dquot_free_block(inode
, EXT4_C2B(EXT4_SB(inode
->i_sb
), 1));
1369 ea_bdebug(bh
, "refcount now=%d; releasing",
1370 le32_to_cpu(BHDR(bh
)->h_refcount
));
1373 ext4_std_error(inode
->i_sb
, error
);
1378 * Find the available free space for EAs. This also returns the total number of
1379 * bytes used by EA entries.
1381 static size_t ext4_xattr_free_space(struct ext4_xattr_entry
*last
,
1382 size_t *min_offs
, void *base
, int *total
)
1384 for (; !IS_LAST_ENTRY(last
); last
= EXT4_XATTR_NEXT(last
)) {
1385 if (!last
->e_value_inum
&& last
->e_value_size
) {
1386 size_t offs
= le16_to_cpu(last
->e_value_offs
);
1387 if (offs
< *min_offs
)
1391 *total
+= EXT4_XATTR_LEN(last
->e_name_len
);
1393 return (*min_offs
- ((void *)last
- base
) - sizeof(__u32
));
1397 * Write the value of the EA in an inode.
1399 static int ext4_xattr_inode_write(handle_t
*handle
, struct inode
*ea_inode
,
1400 const void *buf
, int bufsize
)
1402 struct buffer_head
*bh
= NULL
;
1403 unsigned long block
= 0;
1404 int blocksize
= ea_inode
->i_sb
->s_blocksize
;
1405 int max_blocks
= (bufsize
+ blocksize
- 1) >> ea_inode
->i_blkbits
;
1406 int csize
, wsize
= 0;
1407 int ret
= 0, ret2
= 0;
1411 while (ret
>= 0 && ret
< max_blocks
) {
1412 struct ext4_map_blocks map
;
1413 map
.m_lblk
= block
+= ret
;
1414 map
.m_len
= max_blocks
-= ret
;
1416 ret
= ext4_map_blocks(handle
, ea_inode
, &map
,
1417 EXT4_GET_BLOCKS_CREATE
);
1419 ext4_mark_inode_dirty(handle
, ea_inode
);
1420 if (ret
== -ENOSPC
&&
1421 ext4_should_retry_alloc(ea_inode
->i_sb
, &retries
)) {
1433 while (wsize
< bufsize
) {
1435 csize
= (bufsize
- wsize
) > blocksize
? blocksize
:
1437 bh
= ext4_getblk(handle
, ea_inode
, block
, 0);
1442 EXT4_ERROR_INODE(ea_inode
,
1443 "ext4_getblk() return bh = NULL");
1444 return -EFSCORRUPTED
;
1446 ret
= ext4_journal_get_write_access(handle
, ea_inode
->i_sb
, bh
,
1451 memcpy(bh
->b_data
, buf
, csize
);
1452 set_buffer_uptodate(bh
);
1453 ext4_handle_dirty_metadata(handle
, ea_inode
, bh
);
1460 inode_lock(ea_inode
);
1461 i_size_write(ea_inode
, wsize
);
1462 ext4_update_i_disksize(ea_inode
, wsize
);
1463 inode_unlock(ea_inode
);
1465 ret2
= ext4_mark_inode_dirty(handle
, ea_inode
);
1466 if (unlikely(ret2
&& !ret
))
1476 * Create an inode to store the value of a large EA.
1478 static struct inode
*ext4_xattr_inode_create(handle_t
*handle
,
1479 struct inode
*inode
, u32 hash
)
1481 struct inode
*ea_inode
= NULL
;
1482 uid_t owner
[2] = { i_uid_read(inode
), i_gid_read(inode
) };
1485 if (inode
->i_sb
->s_root
== NULL
) {
1486 ext4_warning(inode
->i_sb
,
1487 "refuse to create EA inode when umounting");
1489 return ERR_PTR(-EINVAL
);
1493 * Let the next inode be the goal, so we try and allocate the EA inode
1494 * in the same group, or nearby one.
1496 ea_inode
= ext4_new_inode(handle
, inode
->i_sb
->s_root
->d_inode
,
1497 S_IFREG
| 0600, NULL
, inode
->i_ino
+ 1, owner
,
1499 if (!IS_ERR(ea_inode
)) {
1500 ea_inode
->i_op
= &ext4_file_inode_operations
;
1501 ea_inode
->i_fop
= &ext4_file_operations
;
1502 ext4_set_aops(ea_inode
);
1503 ext4_xattr_inode_set_class(ea_inode
);
1504 unlock_new_inode(ea_inode
);
1505 ext4_xattr_inode_set_ref(ea_inode
, 1);
1506 ext4_xattr_inode_set_hash(ea_inode
, hash
);
1507 err
= ext4_mark_inode_dirty(handle
, ea_inode
);
1509 err
= ext4_inode_attach_jinode(ea_inode
);
1511 if (ext4_xattr_inode_dec_ref(handle
, ea_inode
))
1512 ext4_warning_inode(ea_inode
,
1513 "cleanup dec ref error %d", err
);
1515 return ERR_PTR(err
);
1519 * Xattr inodes are shared therefore quota charging is performed
1520 * at a higher level.
1522 dquot_free_inode(ea_inode
);
1523 dquot_drop(ea_inode
);
1524 inode_lock(ea_inode
);
1525 ea_inode
->i_flags
|= S_NOQUOTA
;
1526 inode_unlock(ea_inode
);
1532 static struct inode
*
1533 ext4_xattr_inode_cache_find(struct inode
*inode
, const void *value
,
1534 size_t value_len
, u32 hash
)
1536 struct inode
*ea_inode
;
1537 struct mb_cache_entry
*ce
;
1538 struct mb_cache
*ea_inode_cache
= EA_INODE_CACHE(inode
);
1541 if (!ea_inode_cache
)
1544 ce
= mb_cache_entry_find_first(ea_inode_cache
, hash
);
1548 WARN_ON_ONCE(ext4_handle_valid(journal_current_handle()) &&
1549 !(current
->flags
& PF_MEMALLOC_NOFS
));
1551 ea_data
= kvmalloc(value_len
, GFP_KERNEL
);
1553 mb_cache_entry_put(ea_inode_cache
, ce
);
1558 ea_inode
= ext4_iget(inode
->i_sb
, ce
->e_value
,
1560 if (!IS_ERR(ea_inode
) &&
1561 !is_bad_inode(ea_inode
) &&
1562 (EXT4_I(ea_inode
)->i_flags
& EXT4_EA_INODE_FL
) &&
1563 i_size_read(ea_inode
) == value_len
&&
1564 !ext4_xattr_inode_read(ea_inode
, ea_data
, value_len
) &&
1565 !ext4_xattr_inode_verify_hashes(ea_inode
, NULL
, ea_data
,
1567 !memcmp(value
, ea_data
, value_len
)) {
1568 mb_cache_entry_touch(ea_inode_cache
, ce
);
1569 mb_cache_entry_put(ea_inode_cache
, ce
);
1574 if (!IS_ERR(ea_inode
))
1576 ce
= mb_cache_entry_find_next(ea_inode_cache
, ce
);
1583 * Add value of the EA in an inode.
1585 static int ext4_xattr_inode_lookup_create(handle_t
*handle
, struct inode
*inode
,
1586 const void *value
, size_t value_len
,
1587 struct inode
**ret_inode
)
1589 struct inode
*ea_inode
;
1593 hash
= ext4_xattr_inode_hash(EXT4_SB(inode
->i_sb
), value
, value_len
);
1594 ea_inode
= ext4_xattr_inode_cache_find(inode
, value
, value_len
, hash
);
1596 err
= ext4_xattr_inode_inc_ref(handle
, ea_inode
);
1602 *ret_inode
= ea_inode
;
1606 /* Create an inode for the EA value */
1607 ea_inode
= ext4_xattr_inode_create(handle
, inode
, hash
);
1608 if (IS_ERR(ea_inode
))
1609 return PTR_ERR(ea_inode
);
1611 err
= ext4_xattr_inode_write(handle
, ea_inode
, value
, value_len
);
1613 if (ext4_xattr_inode_dec_ref(handle
, ea_inode
))
1614 ext4_warning_inode(ea_inode
, "cleanup dec ref error %d", err
);
1619 if (EA_INODE_CACHE(inode
))
1620 mb_cache_entry_create(EA_INODE_CACHE(inode
), GFP_NOFS
, hash
,
1621 ea_inode
->i_ino
, true /* reusable */);
1623 *ret_inode
= ea_inode
;
1628 * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode
1629 * feature is enabled.
1631 #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U)
1633 static int ext4_xattr_set_entry(struct ext4_xattr_info
*i
,
1634 struct ext4_xattr_search
*s
,
1635 handle_t
*handle
, struct inode
*inode
,
1638 struct ext4_xattr_entry
*last
, *next
;
1639 struct ext4_xattr_entry
*here
= s
->here
;
1640 size_t min_offs
= s
->end
- s
->base
, name_len
= strlen(i
->name
);
1641 int in_inode
= i
->in_inode
;
1642 struct inode
*old_ea_inode
= NULL
;
1643 struct inode
*new_ea_inode
= NULL
;
1644 size_t old_size
, new_size
;
1647 /* Space used by old and new values. */
1648 old_size
= (!s
->not_found
&& !here
->e_value_inum
) ?
1649 EXT4_XATTR_SIZE(le32_to_cpu(here
->e_value_size
)) : 0;
1650 new_size
= (i
->value
&& !in_inode
) ? EXT4_XATTR_SIZE(i
->value_len
) : 0;
1653 * Optimization for the simple case when old and new values have the
1654 * same padded sizes. Not applicable if external inodes are involved.
1656 if (new_size
&& new_size
== old_size
) {
1657 size_t offs
= le16_to_cpu(here
->e_value_offs
);
1658 void *val
= s
->base
+ offs
;
1660 here
->e_value_size
= cpu_to_le32(i
->value_len
);
1661 if (i
->value
== EXT4_ZERO_XATTR_VALUE
) {
1662 memset(val
, 0, new_size
);
1664 memcpy(val
, i
->value
, i
->value_len
);
1665 /* Clear padding bytes. */
1666 memset(val
+ i
->value_len
, 0, new_size
- i
->value_len
);
1671 /* Compute min_offs and last. */
1673 for (; !IS_LAST_ENTRY(last
); last
= next
) {
1674 next
= EXT4_XATTR_NEXT(last
);
1675 if ((void *)next
>= s
->end
) {
1676 EXT4_ERROR_INODE(inode
, "corrupted xattr entries");
1677 ret
= -EFSCORRUPTED
;
1680 if (!last
->e_value_inum
&& last
->e_value_size
) {
1681 size_t offs
= le16_to_cpu(last
->e_value_offs
);
1682 if (offs
< min_offs
)
1687 /* Check whether we have enough space. */
1691 free
= min_offs
- ((void *)last
- s
->base
) - sizeof(__u32
);
1693 free
+= EXT4_XATTR_LEN(name_len
) + old_size
;
1695 if (free
< EXT4_XATTR_LEN(name_len
) + new_size
) {
1701 * If storing the value in an external inode is an option,
1702 * reserve space for xattr entries/names in the external
1703 * attribute block so that a long value does not occupy the
1704 * whole space and prevent further entries being added.
1706 if (ext4_has_feature_ea_inode(inode
->i_sb
) &&
1707 new_size
&& is_block
&&
1708 (min_offs
+ old_size
- new_size
) <
1709 EXT4_XATTR_BLOCK_RESERVE(inode
)) {
1716 * Getting access to old and new ea inodes is subject to failures.
1717 * Finish that work before doing any modifications to the xattr data.
1719 if (!s
->not_found
&& here
->e_value_inum
) {
1720 ret
= ext4_xattr_inode_iget(inode
,
1721 le32_to_cpu(here
->e_value_inum
),
1722 le32_to_cpu(here
->e_hash
),
1725 old_ea_inode
= NULL
;
1729 if (i
->value
&& in_inode
) {
1730 WARN_ON_ONCE(!i
->value_len
);
1732 ret
= ext4_xattr_inode_alloc_quota(inode
, i
->value_len
);
1736 ret
= ext4_xattr_inode_lookup_create(handle
, inode
, i
->value
,
1740 new_ea_inode
= NULL
;
1741 ext4_xattr_inode_free_quota(inode
, NULL
, i
->value_len
);
1747 /* We are ready to release ref count on the old_ea_inode. */
1748 ret
= ext4_xattr_inode_dec_ref(handle
, old_ea_inode
);
1750 /* Release newly required ref count on new_ea_inode. */
1754 err
= ext4_xattr_inode_dec_ref(handle
,
1757 ext4_warning_inode(new_ea_inode
,
1758 "dec ref new_ea_inode err=%d",
1760 ext4_xattr_inode_free_quota(inode
, new_ea_inode
,
1766 ext4_xattr_inode_free_quota(inode
, old_ea_inode
,
1767 le32_to_cpu(here
->e_value_size
));
1770 /* No failures allowed past this point. */
1772 if (!s
->not_found
&& here
->e_value_size
&& !here
->e_value_inum
) {
1773 /* Remove the old value. */
1774 void *first_val
= s
->base
+ min_offs
;
1775 size_t offs
= le16_to_cpu(here
->e_value_offs
);
1776 void *val
= s
->base
+ offs
;
1778 memmove(first_val
+ old_size
, first_val
, val
- first_val
);
1779 memset(first_val
, 0, old_size
);
1780 min_offs
+= old_size
;
1782 /* Adjust all value offsets. */
1784 while (!IS_LAST_ENTRY(last
)) {
1785 size_t o
= le16_to_cpu(last
->e_value_offs
);
1787 if (!last
->e_value_inum
&&
1788 last
->e_value_size
&& o
< offs
)
1789 last
->e_value_offs
= cpu_to_le16(o
+ old_size
);
1790 last
= EXT4_XATTR_NEXT(last
);
1795 /* Remove old name. */
1796 size_t size
= EXT4_XATTR_LEN(name_len
);
1798 last
= ENTRY((void *)last
- size
);
1799 memmove(here
, (void *)here
+ size
,
1800 (void *)last
- (void *)here
+ sizeof(__u32
));
1801 memset(last
, 0, size
);
1802 } else if (s
->not_found
) {
1803 /* Insert new name. */
1804 size_t size
= EXT4_XATTR_LEN(name_len
);
1805 size_t rest
= (void *)last
- (void *)here
+ sizeof(__u32
);
1807 memmove((void *)here
+ size
, here
, rest
);
1808 memset(here
, 0, size
);
1809 here
->e_name_index
= i
->name_index
;
1810 here
->e_name_len
= name_len
;
1811 memcpy(here
->e_name
, i
->name
, name_len
);
1813 /* This is an update, reset value info. */
1814 here
->e_value_inum
= 0;
1815 here
->e_value_offs
= 0;
1816 here
->e_value_size
= 0;
1820 /* Insert new value. */
1822 here
->e_value_inum
= cpu_to_le32(new_ea_inode
->i_ino
);
1823 } else if (i
->value_len
) {
1824 void *val
= s
->base
+ min_offs
- new_size
;
1826 here
->e_value_offs
= cpu_to_le16(min_offs
- new_size
);
1827 if (i
->value
== EXT4_ZERO_XATTR_VALUE
) {
1828 memset(val
, 0, new_size
);
1830 memcpy(val
, i
->value
, i
->value_len
);
1831 /* Clear padding bytes. */
1832 memset(val
+ i
->value_len
, 0,
1833 new_size
- i
->value_len
);
1836 here
->e_value_size
= cpu_to_le32(i
->value_len
);
1843 /* Entry hash calculation. */
1848 * Feed crc32c hash instead of the raw value for entry
1849 * hash calculation. This is to avoid walking
1850 * potentially long value buffer again.
1852 crc32c_hash
= cpu_to_le32(
1853 ext4_xattr_inode_get_hash(new_ea_inode
));
1854 hash
= ext4_xattr_hash_entry(here
->e_name
,
1857 } else if (is_block
) {
1858 __le32
*value
= s
->base
+ le16_to_cpu(
1859 here
->e_value_offs
);
1861 hash
= ext4_xattr_hash_entry(here
->e_name
,
1862 here
->e_name_len
, value
,
1865 here
->e_hash
= hash
;
1869 ext4_xattr_rehash((struct ext4_xattr_header
*)s
->base
);
1878 struct ext4_xattr_block_find
{
1879 struct ext4_xattr_search s
;
1880 struct buffer_head
*bh
;
1884 ext4_xattr_block_find(struct inode
*inode
, struct ext4_xattr_info
*i
,
1885 struct ext4_xattr_block_find
*bs
)
1887 struct super_block
*sb
= inode
->i_sb
;
1890 ea_idebug(inode
, "name=%d.%s, value=%p, value_len=%ld",
1891 i
->name_index
, i
->name
, i
->value
, (long)i
->value_len
);
1893 if (EXT4_I(inode
)->i_file_acl
) {
1894 /* The inode already has an extended attribute block. */
1895 bs
->bh
= ext4_sb_bread(sb
, EXT4_I(inode
)->i_file_acl
, REQ_PRIO
);
1896 if (IS_ERR(bs
->bh
)) {
1897 error
= PTR_ERR(bs
->bh
);
1901 ea_bdebug(bs
->bh
, "b_count=%d, refcount=%d",
1902 atomic_read(&(bs
->bh
->b_count
)),
1903 le32_to_cpu(BHDR(bs
->bh
)->h_refcount
));
1904 error
= ext4_xattr_check_block(inode
, bs
->bh
);
1907 /* Find the named attribute. */
1908 bs
->s
.base
= BHDR(bs
->bh
);
1909 bs
->s
.first
= BFIRST(bs
->bh
);
1910 bs
->s
.end
= bs
->bh
->b_data
+ bs
->bh
->b_size
;
1911 bs
->s
.here
= bs
->s
.first
;
1912 error
= xattr_find_entry(inode
, &bs
->s
.here
, bs
->s
.end
,
1913 i
->name_index
, i
->name
, 1);
1914 if (error
&& error
!= -ENODATA
)
1916 bs
->s
.not_found
= error
;
1922 ext4_xattr_block_set(handle_t
*handle
, struct inode
*inode
,
1923 struct ext4_xattr_info
*i
,
1924 struct ext4_xattr_block_find
*bs
)
1926 struct super_block
*sb
= inode
->i_sb
;
1927 struct buffer_head
*new_bh
= NULL
;
1928 struct ext4_xattr_search s_copy
= bs
->s
;
1929 struct ext4_xattr_search
*s
= &s_copy
;
1930 struct mb_cache_entry
*ce
= NULL
;
1932 struct mb_cache
*ea_block_cache
= EA_BLOCK_CACHE(inode
);
1933 struct inode
*ea_inode
= NULL
, *tmp_inode
;
1934 size_t old_ea_inode_quota
= 0;
1935 unsigned int ea_ino
;
1938 #define header(x) ((struct ext4_xattr_header *)(x))
1941 int offset
= (char *)s
->here
- bs
->bh
->b_data
;
1943 BUFFER_TRACE(bs
->bh
, "get_write_access");
1944 error
= ext4_journal_get_write_access(handle
, sb
, bs
->bh
,
1948 lock_buffer(bs
->bh
);
1950 if (header(s
->base
)->h_refcount
== cpu_to_le32(1)) {
1951 __u32 hash
= le32_to_cpu(BHDR(bs
->bh
)->h_hash
);
1954 * This must happen under buffer lock for
1955 * ext4_xattr_block_set() to reliably detect modified
1958 if (ea_block_cache
) {
1959 struct mb_cache_entry
*oe
;
1961 oe
= mb_cache_entry_delete_or_get(ea_block_cache
,
1962 hash
, bs
->bh
->b_blocknr
);
1965 * Xattr block is getting reused. Leave
1968 mb_cache_entry_put(ea_block_cache
, oe
);
1972 ea_bdebug(bs
->bh
, "modifying in-place");
1973 error
= ext4_xattr_set_entry(i
, s
, handle
, inode
,
1974 true /* is_block */);
1975 ext4_xattr_block_csum_set(inode
, bs
->bh
);
1976 unlock_buffer(bs
->bh
);
1977 if (error
== -EFSCORRUPTED
)
1980 error
= ext4_handle_dirty_metadata(handle
,
1988 unlock_buffer(bs
->bh
);
1989 ea_bdebug(bs
->bh
, "cloning");
1990 s
->base
= kmemdup(BHDR(bs
->bh
), bs
->bh
->b_size
, GFP_NOFS
);
1992 if (s
->base
== NULL
)
1994 s
->first
= ENTRY(header(s
->base
)+1);
1995 header(s
->base
)->h_refcount
= cpu_to_le32(1);
1996 s
->here
= ENTRY(s
->base
+ offset
);
1997 s
->end
= s
->base
+ bs
->bh
->b_size
;
2000 * If existing entry points to an xattr inode, we need
2001 * to prevent ext4_xattr_set_entry() from decrementing
2002 * ref count on it because the reference belongs to the
2003 * original block. In this case, make the entry look
2004 * like it has an empty value.
2006 if (!s
->not_found
&& s
->here
->e_value_inum
) {
2007 ea_ino
= le32_to_cpu(s
->here
->e_value_inum
);
2008 error
= ext4_xattr_inode_iget(inode
, ea_ino
,
2009 le32_to_cpu(s
->here
->e_hash
),
2014 if (!ext4_test_inode_state(tmp_inode
,
2015 EXT4_STATE_LUSTRE_EA_INODE
)) {
2017 * Defer quota free call for previous
2018 * inode until success is guaranteed.
2020 old_ea_inode_quota
= le32_to_cpu(
2021 s
->here
->e_value_size
);
2025 s
->here
->e_value_inum
= 0;
2026 s
->here
->e_value_size
= 0;
2029 /* Allocate a buffer where we construct the new block. */
2030 s
->base
= kzalloc(sb
->s_blocksize
, GFP_NOFS
);
2032 if (s
->base
== NULL
)
2034 header(s
->base
)->h_magic
= cpu_to_le32(EXT4_XATTR_MAGIC
);
2035 header(s
->base
)->h_blocks
= cpu_to_le32(1);
2036 header(s
->base
)->h_refcount
= cpu_to_le32(1);
2037 s
->first
= ENTRY(header(s
->base
)+1);
2038 s
->here
= ENTRY(header(s
->base
)+1);
2039 s
->end
= s
->base
+ sb
->s_blocksize
;
2042 error
= ext4_xattr_set_entry(i
, s
, handle
, inode
, true /* is_block */);
2043 if (error
== -EFSCORRUPTED
)
2048 if (i
->value
&& s
->here
->e_value_inum
) {
2050 * A ref count on ea_inode has been taken as part of the call to
2051 * ext4_xattr_set_entry() above. We would like to drop this
2052 * extra ref but we have to wait until the xattr block is
2053 * initialized and has its own ref count on the ea_inode.
2055 ea_ino
= le32_to_cpu(s
->here
->e_value_inum
);
2056 error
= ext4_xattr_inode_iget(inode
, ea_ino
,
2057 le32_to_cpu(s
->here
->e_hash
),
2066 if (!IS_LAST_ENTRY(s
->first
)) {
2067 new_bh
= ext4_xattr_block_cache_find(inode
, header(s
->base
),
2070 /* We found an identical block in the cache. */
2071 if (new_bh
== bs
->bh
)
2072 ea_bdebug(new_bh
, "keeping");
2076 WARN_ON_ONCE(dquot_initialize_needed(inode
));
2078 /* The old block is released after updating
2080 error
= dquot_alloc_block(inode
,
2081 EXT4_C2B(EXT4_SB(sb
), 1));
2084 BUFFER_TRACE(new_bh
, "get_write_access");
2085 error
= ext4_journal_get_write_access(
2090 lock_buffer(new_bh
);
2092 * We have to be careful about races with
2093 * adding references to xattr block. Once we
2094 * hold buffer lock xattr block's state is
2095 * stable so we can check the additional
2098 ref
= le32_to_cpu(BHDR(new_bh
)->h_refcount
) + 1;
2099 if (ref
> EXT4_XATTR_REFCOUNT_MAX
) {
2101 * Undo everything and check mbcache
2104 unlock_buffer(new_bh
);
2105 dquot_free_block(inode
,
2106 EXT4_C2B(EXT4_SB(sb
),
2109 mb_cache_entry_put(ea_block_cache
, ce
);
2114 BHDR(new_bh
)->h_refcount
= cpu_to_le32(ref
);
2115 if (ref
== EXT4_XATTR_REFCOUNT_MAX
)
2116 clear_bit(MBE_REUSABLE_B
, &ce
->e_flags
);
2117 ea_bdebug(new_bh
, "reusing; refcount now=%d",
2119 ext4_xattr_block_csum_set(inode
, new_bh
);
2120 unlock_buffer(new_bh
);
2121 error
= ext4_handle_dirty_metadata(handle
,
2127 mb_cache_entry_touch(ea_block_cache
, ce
);
2128 mb_cache_entry_put(ea_block_cache
, ce
);
2130 } else if (bs
->bh
&& s
->base
== bs
->bh
->b_data
) {
2131 /* We were modifying this block in-place. */
2132 ea_bdebug(bs
->bh
, "keeping this block");
2133 ext4_xattr_block_cache_insert(ea_block_cache
, bs
->bh
);
2137 /* We need to allocate a new block */
2138 ext4_fsblk_t goal
, block
;
2140 WARN_ON_ONCE(dquot_initialize_needed(inode
));
2142 goal
= ext4_group_first_block_no(sb
,
2143 EXT4_I(inode
)->i_block_group
);
2144 block
= ext4_new_meta_blocks(handle
, inode
, goal
, 0,
2149 ea_idebug(inode
, "creating block %llu",
2150 (unsigned long long)block
);
2152 new_bh
= sb_getblk(sb
, block
);
2153 if (unlikely(!new_bh
)) {
2156 ext4_free_blocks(handle
, inode
, NULL
, block
, 1,
2157 EXT4_FREE_BLOCKS_METADATA
);
2160 error
= ext4_xattr_inode_inc_ref_all(handle
, inode
,
2161 ENTRY(header(s
->base
)+1));
2165 /* Drop the extra ref on ea_inode. */
2166 error
= ext4_xattr_inode_dec_ref(handle
,
2169 ext4_warning_inode(ea_inode
,
2176 lock_buffer(new_bh
);
2177 error
= ext4_journal_get_create_access(handle
, sb
,
2178 new_bh
, EXT4_JTR_NONE
);
2180 unlock_buffer(new_bh
);
2184 memcpy(new_bh
->b_data
, s
->base
, new_bh
->b_size
);
2185 ext4_xattr_block_csum_set(inode
, new_bh
);
2186 set_buffer_uptodate(new_bh
);
2187 unlock_buffer(new_bh
);
2188 ext4_xattr_block_cache_insert(ea_block_cache
, new_bh
);
2189 error
= ext4_handle_dirty_metadata(handle
, inode
,
2196 if (old_ea_inode_quota
)
2197 ext4_xattr_inode_free_quota(inode
, NULL
, old_ea_inode_quota
);
2199 /* Update the inode. */
2200 EXT4_I(inode
)->i_file_acl
= new_bh
? new_bh
->b_blocknr
: 0;
2202 /* Drop the previous xattr block. */
2203 if (bs
->bh
&& bs
->bh
!= new_bh
) {
2204 struct ext4_xattr_inode_array
*ea_inode_array
= NULL
;
2206 ext4_xattr_release_block(handle
, inode
, bs
->bh
,
2208 0 /* extra_credits */);
2209 ext4_xattr_inode_array_free(ea_inode_array
);
2217 error2
= ext4_xattr_inode_dec_ref(handle
, ea_inode
);
2219 ext4_warning_inode(ea_inode
, "dec ref error=%d",
2222 /* If there was an error, revert the quota charge. */
2224 ext4_xattr_inode_free_quota(inode
, ea_inode
,
2225 i_size_read(ea_inode
));
2229 mb_cache_entry_put(ea_block_cache
, ce
);
2231 if (!(bs
->bh
&& s
->base
== bs
->bh
->b_data
))
2237 dquot_free_block(inode
, EXT4_C2B(EXT4_SB(sb
), 1));
2241 EXT4_ERROR_INODE(inode
, "bad block %llu",
2242 EXT4_I(inode
)->i_file_acl
);
2248 int ext4_xattr_ibody_find(struct inode
*inode
, struct ext4_xattr_info
*i
,
2249 struct ext4_xattr_ibody_find
*is
)
2251 struct ext4_xattr_ibody_header
*header
;
2252 struct ext4_inode
*raw_inode
;
2255 if (!EXT4_INODE_HAS_XATTR_SPACE(inode
))
2258 raw_inode
= ext4_raw_inode(&is
->iloc
);
2259 header
= IHDR(inode
, raw_inode
);
2260 is
->s
.base
= is
->s
.first
= IFIRST(header
);
2261 is
->s
.here
= is
->s
.first
;
2262 is
->s
.end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
2263 if (ext4_test_inode_state(inode
, EXT4_STATE_XATTR
)) {
2264 error
= xattr_check_inode(inode
, header
, is
->s
.end
);
2267 /* Find the named attribute. */
2268 error
= xattr_find_entry(inode
, &is
->s
.here
, is
->s
.end
,
2269 i
->name_index
, i
->name
, 0);
2270 if (error
&& error
!= -ENODATA
)
2272 is
->s
.not_found
= error
;
2277 int ext4_xattr_ibody_set(handle_t
*handle
, struct inode
*inode
,
2278 struct ext4_xattr_info
*i
,
2279 struct ext4_xattr_ibody_find
*is
)
2281 struct ext4_xattr_ibody_header
*header
;
2282 struct ext4_xattr_search
*s
= &is
->s
;
2285 if (!EXT4_INODE_HAS_XATTR_SPACE(inode
))
2288 error
= ext4_xattr_set_entry(i
, s
, handle
, inode
, false /* is_block */);
2291 header
= IHDR(inode
, ext4_raw_inode(&is
->iloc
));
2292 if (!IS_LAST_ENTRY(s
->first
)) {
2293 header
->h_magic
= cpu_to_le32(EXT4_XATTR_MAGIC
);
2294 ext4_set_inode_state(inode
, EXT4_STATE_XATTR
);
2296 header
->h_magic
= cpu_to_le32(0);
2297 ext4_clear_inode_state(inode
, EXT4_STATE_XATTR
);
2302 static int ext4_xattr_value_same(struct ext4_xattr_search
*s
,
2303 struct ext4_xattr_info
*i
)
2307 /* When e_value_inum is set the value is stored externally. */
2308 if (s
->here
->e_value_inum
)
2310 if (le32_to_cpu(s
->here
->e_value_size
) != i
->value_len
)
2312 value
= ((void *)s
->base
) + le16_to_cpu(s
->here
->e_value_offs
);
2313 return !memcmp(value
, i
->value
, i
->value_len
);
2316 static struct buffer_head
*ext4_xattr_get_block(struct inode
*inode
)
2318 struct buffer_head
*bh
;
2321 if (!EXT4_I(inode
)->i_file_acl
)
2323 bh
= ext4_sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
, REQ_PRIO
);
2326 error
= ext4_xattr_check_block(inode
, bh
);
2329 return ERR_PTR(error
);
2335 * ext4_xattr_set_handle()
2337 * Create, replace or remove an extended attribute for this inode. Value
2338 * is NULL to remove an existing extended attribute, and non-NULL to
2339 * either replace an existing extended attribute, or create a new extended
2340 * attribute. The flags XATTR_REPLACE and XATTR_CREATE
2341 * specify that an extended attribute must exist and must not exist
2342 * previous to the call, respectively.
2344 * Returns 0, or a negative error number on failure.
2347 ext4_xattr_set_handle(handle_t
*handle
, struct inode
*inode
, int name_index
,
2348 const char *name
, const void *value
, size_t value_len
,
2351 struct ext4_xattr_info i
= {
2352 .name_index
= name_index
,
2355 .value_len
= value_len
,
2358 struct ext4_xattr_ibody_find is
= {
2359 .s
= { .not_found
= -ENODATA
, },
2361 struct ext4_xattr_block_find bs
= {
2362 .s
= { .not_found
= -ENODATA
, },
2369 if (strlen(name
) > 255)
2372 ext4_write_lock_xattr(inode
, &no_expand
);
2374 /* Check journal credits under write lock. */
2375 if (ext4_handle_valid(handle
)) {
2376 struct buffer_head
*bh
;
2379 bh
= ext4_xattr_get_block(inode
);
2381 error
= PTR_ERR(bh
);
2385 credits
= __ext4_xattr_set_credits(inode
->i_sb
, inode
, bh
,
2387 flags
& XATTR_CREATE
);
2390 if (jbd2_handle_buffer_credits(handle
) < credits
) {
2394 WARN_ON_ONCE(!(current
->flags
& PF_MEMALLOC_NOFS
));
2397 error
= ext4_reserve_inode_write(handle
, inode
, &is
.iloc
);
2401 if (ext4_test_inode_state(inode
, EXT4_STATE_NEW
)) {
2402 struct ext4_inode
*raw_inode
= ext4_raw_inode(&is
.iloc
);
2403 memset(raw_inode
, 0, EXT4_SB(inode
->i_sb
)->s_inode_size
);
2404 ext4_clear_inode_state(inode
, EXT4_STATE_NEW
);
2407 error
= ext4_xattr_ibody_find(inode
, &i
, &is
);
2411 error
= ext4_xattr_block_find(inode
, &i
, &bs
);
2414 if (is
.s
.not_found
&& bs
.s
.not_found
) {
2416 if (flags
& XATTR_REPLACE
)
2423 if (flags
& XATTR_CREATE
)
2428 if (!is
.s
.not_found
)
2429 error
= ext4_xattr_ibody_set(handle
, inode
, &i
, &is
);
2430 else if (!bs
.s
.not_found
)
2431 error
= ext4_xattr_block_set(handle
, inode
, &i
, &bs
);
2434 /* Xattr value did not change? Save us some work and bail out */
2435 if (!is
.s
.not_found
&& ext4_xattr_value_same(&is
.s
, &i
))
2437 if (!bs
.s
.not_found
&& ext4_xattr_value_same(&bs
.s
, &i
))
2440 if (ext4_has_feature_ea_inode(inode
->i_sb
) &&
2441 (EXT4_XATTR_SIZE(i
.value_len
) >
2442 EXT4_XATTR_MIN_LARGE_EA_SIZE(inode
->i_sb
->s_blocksize
)))
2445 error
= ext4_xattr_ibody_set(handle
, inode
, &i
, &is
);
2446 if (!error
&& !bs
.s
.not_found
) {
2448 error
= ext4_xattr_block_set(handle
, inode
, &i
, &bs
);
2449 } else if (error
== -ENOSPC
) {
2450 if (EXT4_I(inode
)->i_file_acl
&& !bs
.s
.base
) {
2453 error
= ext4_xattr_block_find(inode
, &i
, &bs
);
2457 error
= ext4_xattr_block_set(handle
, inode
, &i
, &bs
);
2458 if (!error
&& !is
.s
.not_found
) {
2460 error
= ext4_xattr_ibody_set(handle
, inode
, &i
,
2462 } else if (error
== -ENOSPC
) {
2464 * Xattr does not fit in the block, store at
2465 * external inode if possible.
2467 if (ext4_has_feature_ea_inode(inode
->i_sb
) &&
2468 i
.value_len
&& !i
.in_inode
) {
2476 ext4_xattr_update_super_block(handle
, inode
->i_sb
);
2477 inode
->i_ctime
= current_time(inode
);
2478 inode_inc_iversion(inode
);
2481 error
= ext4_mark_iloc_dirty(handle
, inode
, &is
.iloc
);
2483 * The bh is consumed by ext4_mark_iloc_dirty, even with
2488 ext4_handle_sync(handle
);
2490 ext4_fc_mark_ineligible(inode
->i_sb
, EXT4_FC_REASON_XATTR
, handle
);
2495 ext4_write_unlock_xattr(inode
, &no_expand
);
2499 int ext4_xattr_set_credits(struct inode
*inode
, size_t value_len
,
2500 bool is_create
, int *credits
)
2502 struct buffer_head
*bh
;
2507 if (!EXT4_SB(inode
->i_sb
)->s_journal
)
2510 down_read(&EXT4_I(inode
)->xattr_sem
);
2512 bh
= ext4_xattr_get_block(inode
);
2516 *credits
= __ext4_xattr_set_credits(inode
->i_sb
, inode
, bh
,
2517 value_len
, is_create
);
2522 up_read(&EXT4_I(inode
)->xattr_sem
);
2529 * Like ext4_xattr_set_handle, but start from an inode. This extended
2530 * attribute modification is a filesystem transaction by itself.
2532 * Returns 0, or a negative error number on failure.
2535 ext4_xattr_set(struct inode
*inode
, int name_index
, const char *name
,
2536 const void *value
, size_t value_len
, int flags
)
2539 struct super_block
*sb
= inode
->i_sb
;
2540 int error
, retries
= 0;
2543 error
= dquot_initialize(inode
);
2548 error
= ext4_xattr_set_credits(inode
, value_len
, flags
& XATTR_CREATE
,
2553 handle
= ext4_journal_start(inode
, EXT4_HT_XATTR
, credits
);
2554 if (IS_ERR(handle
)) {
2555 error
= PTR_ERR(handle
);
2559 error
= ext4_xattr_set_handle(handle
, inode
, name_index
, name
,
2560 value
, value_len
, flags
);
2561 error2
= ext4_journal_stop(handle
);
2562 if (error
== -ENOSPC
&&
2563 ext4_should_retry_alloc(sb
, &retries
))
2568 ext4_fc_mark_ineligible(inode
->i_sb
, EXT4_FC_REASON_XATTR
, NULL
);
2574 * Shift the EA entries in the inode to create space for the increased
2577 static void ext4_xattr_shift_entries(struct ext4_xattr_entry
*entry
,
2578 int value_offs_shift
, void *to
,
2579 void *from
, size_t n
)
2581 struct ext4_xattr_entry
*last
= entry
;
2584 /* We always shift xattr headers further thus offsets get lower */
2585 BUG_ON(value_offs_shift
> 0);
2587 /* Adjust the value offsets of the entries */
2588 for (; !IS_LAST_ENTRY(last
); last
= EXT4_XATTR_NEXT(last
)) {
2589 if (!last
->e_value_inum
&& last
->e_value_size
) {
2590 new_offs
= le16_to_cpu(last
->e_value_offs
) +
2592 last
->e_value_offs
= cpu_to_le16(new_offs
);
2595 /* Shift the entries by n bytes */
2596 memmove(to
, from
, n
);
2600 * Move xattr pointed to by 'entry' from inode into external xattr block
2602 static int ext4_xattr_move_to_block(handle_t
*handle
, struct inode
*inode
,
2603 struct ext4_inode
*raw_inode
,
2604 struct ext4_xattr_entry
*entry
)
2606 struct ext4_xattr_ibody_find
*is
= NULL
;
2607 struct ext4_xattr_block_find
*bs
= NULL
;
2608 char *buffer
= NULL
, *b_entry_name
= NULL
;
2609 size_t value_size
= le32_to_cpu(entry
->e_value_size
);
2610 struct ext4_xattr_info i
= {
2613 .name_index
= entry
->e_name_index
,
2614 .in_inode
= !!entry
->e_value_inum
,
2616 struct ext4_xattr_ibody_header
*header
= IHDR(inode
, raw_inode
);
2619 is
= kzalloc(sizeof(struct ext4_xattr_ibody_find
), GFP_NOFS
);
2620 bs
= kzalloc(sizeof(struct ext4_xattr_block_find
), GFP_NOFS
);
2621 b_entry_name
= kmalloc(entry
->e_name_len
+ 1, GFP_NOFS
);
2622 if (!is
|| !bs
|| !b_entry_name
) {
2627 is
->s
.not_found
= -ENODATA
;
2628 bs
->s
.not_found
= -ENODATA
;
2632 /* Save the entry name and the entry value */
2633 if (entry
->e_value_inum
) {
2634 buffer
= kvmalloc(value_size
, GFP_NOFS
);
2640 error
= ext4_xattr_inode_get(inode
, entry
, buffer
, value_size
);
2644 size_t value_offs
= le16_to_cpu(entry
->e_value_offs
);
2645 buffer
= (void *)IFIRST(header
) + value_offs
;
2648 memcpy(b_entry_name
, entry
->e_name
, entry
->e_name_len
);
2649 b_entry_name
[entry
->e_name_len
] = '\0';
2650 i
.name
= b_entry_name
;
2652 error
= ext4_get_inode_loc(inode
, &is
->iloc
);
2656 error
= ext4_xattr_ibody_find(inode
, &i
, is
);
2661 i
.value_len
= value_size
;
2662 error
= ext4_xattr_block_find(inode
, &i
, bs
);
2666 /* Move ea entry from the inode into the block */
2667 error
= ext4_xattr_block_set(handle
, inode
, &i
, bs
);
2671 /* Remove the chosen entry from the inode */
2674 error
= ext4_xattr_ibody_set(handle
, inode
, &i
, is
);
2677 kfree(b_entry_name
);
2678 if (entry
->e_value_inum
&& buffer
)
2681 brelse(is
->iloc
.bh
);
2690 static int ext4_xattr_make_inode_space(handle_t
*handle
, struct inode
*inode
,
2691 struct ext4_inode
*raw_inode
,
2692 int isize_diff
, size_t ifree
,
2693 size_t bfree
, int *total_ino
)
2695 struct ext4_xattr_ibody_header
*header
= IHDR(inode
, raw_inode
);
2696 struct ext4_xattr_entry
*small_entry
;
2697 struct ext4_xattr_entry
*entry
;
2698 struct ext4_xattr_entry
*last
;
2699 unsigned int entry_size
; /* EA entry size */
2700 unsigned int total_size
; /* EA entry size + value size */
2701 unsigned int min_total_size
;
2704 while (isize_diff
> ifree
) {
2707 min_total_size
= ~0U;
2708 last
= IFIRST(header
);
2709 /* Find the entry best suited to be pushed into EA block */
2710 for (; !IS_LAST_ENTRY(last
); last
= EXT4_XATTR_NEXT(last
)) {
2711 /* never move system.data out of the inode */
2712 if ((last
->e_name_len
== 4) &&
2713 (last
->e_name_index
== EXT4_XATTR_INDEX_SYSTEM
) &&
2714 !memcmp(last
->e_name
, "data", 4))
2716 total_size
= EXT4_XATTR_LEN(last
->e_name_len
);
2717 if (!last
->e_value_inum
)
2718 total_size
+= EXT4_XATTR_SIZE(
2719 le32_to_cpu(last
->e_value_size
));
2720 if (total_size
<= bfree
&&
2721 total_size
< min_total_size
) {
2722 if (total_size
+ ifree
< isize_diff
) {
2726 min_total_size
= total_size
;
2731 if (entry
== NULL
) {
2732 if (small_entry
== NULL
)
2734 entry
= small_entry
;
2737 entry_size
= EXT4_XATTR_LEN(entry
->e_name_len
);
2738 total_size
= entry_size
;
2739 if (!entry
->e_value_inum
)
2740 total_size
+= EXT4_XATTR_SIZE(
2741 le32_to_cpu(entry
->e_value_size
));
2742 error
= ext4_xattr_move_to_block(handle
, inode
, raw_inode
,
2747 *total_ino
-= entry_size
;
2748 ifree
+= total_size
;
2749 bfree
-= total_size
;
2756 * Expand an inode by new_extra_isize bytes when EAs are present.
2757 * Returns 0 on success or negative error number on failure.
2759 int ext4_expand_extra_isize_ea(struct inode
*inode
, int new_extra_isize
,
2760 struct ext4_inode
*raw_inode
, handle_t
*handle
)
2762 struct ext4_xattr_ibody_header
*header
;
2763 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
2764 static unsigned int mnt_count
;
2766 size_t ifree
, bfree
;
2769 int error
= 0, tried_min_extra_isize
= 0;
2770 int s_min_extra_isize
= le16_to_cpu(sbi
->s_es
->s_min_extra_isize
);
2771 int isize_diff
; /* How much do we need to grow i_extra_isize */
2774 isize_diff
= new_extra_isize
- EXT4_I(inode
)->i_extra_isize
;
2775 if (EXT4_I(inode
)->i_extra_isize
>= new_extra_isize
)
2778 header
= IHDR(inode
, raw_inode
);
2781 * Check if enough free space is available in the inode to shift the
2782 * entries ahead by new_extra_isize.
2785 base
= IFIRST(header
);
2786 end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
2787 min_offs
= end
- base
;
2788 total_ino
= sizeof(struct ext4_xattr_ibody_header
) + sizeof(u32
);
2790 error
= xattr_check_inode(inode
, header
, end
);
2794 ifree
= ext4_xattr_free_space(base
, &min_offs
, base
, &total_ino
);
2795 if (ifree
>= isize_diff
)
2799 * Enough free space isn't available in the inode, check if
2800 * EA block can hold new_extra_isize bytes.
2802 if (EXT4_I(inode
)->i_file_acl
) {
2803 struct buffer_head
*bh
;
2805 bh
= ext4_sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
, REQ_PRIO
);
2807 error
= PTR_ERR(bh
);
2810 error
= ext4_xattr_check_block(inode
, bh
);
2816 end
= bh
->b_data
+ bh
->b_size
;
2817 min_offs
= end
- base
;
2818 bfree
= ext4_xattr_free_space(BFIRST(bh
), &min_offs
, base
,
2821 if (bfree
+ ifree
< isize_diff
) {
2822 if (!tried_min_extra_isize
&& s_min_extra_isize
) {
2823 tried_min_extra_isize
++;
2824 new_extra_isize
= s_min_extra_isize
;
2831 bfree
= inode
->i_sb
->s_blocksize
;
2834 error
= ext4_xattr_make_inode_space(handle
, inode
, raw_inode
,
2835 isize_diff
, ifree
, bfree
,
2838 if (error
== -ENOSPC
&& !tried_min_extra_isize
&&
2839 s_min_extra_isize
) {
2840 tried_min_extra_isize
++;
2841 new_extra_isize
= s_min_extra_isize
;
2847 /* Adjust the offsets and shift the remaining entries ahead */
2848 ext4_xattr_shift_entries(IFIRST(header
), EXT4_I(inode
)->i_extra_isize
2849 - new_extra_isize
, (void *)raw_inode
+
2850 EXT4_GOOD_OLD_INODE_SIZE
+ new_extra_isize
,
2851 (void *)header
, total_ino
);
2852 EXT4_I(inode
)->i_extra_isize
= new_extra_isize
;
2855 if (error
&& (mnt_count
!= le16_to_cpu(sbi
->s_es
->s_mnt_count
))) {
2856 ext4_warning(inode
->i_sb
, "Unable to expand inode %lu. Delete some EAs or run e2fsck.",
2858 mnt_count
= le16_to_cpu(sbi
->s_es
->s_mnt_count
);
2863 #define EIA_INCR 16 /* must be 2^n */
2864 #define EIA_MASK (EIA_INCR - 1)
2866 /* Add the large xattr @inode into @ea_inode_array for deferred iput().
2867 * If @ea_inode_array is new or full it will be grown and the old
2868 * contents copied over.
2871 ext4_expand_inode_array(struct ext4_xattr_inode_array
**ea_inode_array
,
2872 struct inode
*inode
)
2874 if (*ea_inode_array
== NULL
) {
2876 * Start with 15 inodes, so it fits into a power-of-two size.
2877 * If *ea_inode_array is NULL, this is essentially offsetof()
2880 kmalloc(offsetof(struct ext4_xattr_inode_array
,
2883 if (*ea_inode_array
== NULL
)
2885 (*ea_inode_array
)->count
= 0;
2886 } else if (((*ea_inode_array
)->count
& EIA_MASK
) == EIA_MASK
) {
2887 /* expand the array once all 15 + n * 16 slots are full */
2888 struct ext4_xattr_inode_array
*new_array
= NULL
;
2889 int count
= (*ea_inode_array
)->count
;
2891 /* if new_array is NULL, this is essentially offsetof() */
2892 new_array
= kmalloc(
2893 offsetof(struct ext4_xattr_inode_array
,
2894 inodes
[count
+ EIA_INCR
]),
2896 if (new_array
== NULL
)
2898 memcpy(new_array
, *ea_inode_array
,
2899 offsetof(struct ext4_xattr_inode_array
, inodes
[count
]));
2900 kfree(*ea_inode_array
);
2901 *ea_inode_array
= new_array
;
2903 (*ea_inode_array
)->inodes
[(*ea_inode_array
)->count
++] = inode
;
2908 * ext4_xattr_delete_inode()
2910 * Free extended attribute resources associated with this inode. Traverse
2911 * all entries and decrement reference on any xattr inodes associated with this
2912 * inode. This is called immediately before an inode is freed. We have exclusive
2913 * access to the inode. If an orphan inode is deleted it will also release its
2914 * references on xattr block and xattr inodes.
2916 int ext4_xattr_delete_inode(handle_t
*handle
, struct inode
*inode
,
2917 struct ext4_xattr_inode_array
**ea_inode_array
,
2920 struct buffer_head
*bh
= NULL
;
2921 struct ext4_xattr_ibody_header
*header
;
2922 struct ext4_iloc iloc
= { .bh
= NULL
};
2923 struct ext4_xattr_entry
*entry
;
2924 struct inode
*ea_inode
;
2927 error
= ext4_journal_ensure_credits(handle
, extra_credits
,
2928 ext4_free_metadata_revoke_credits(inode
->i_sb
, 1));
2930 EXT4_ERROR_INODE(inode
, "ensure credits (error %d)", error
);
2934 if (ext4_has_feature_ea_inode(inode
->i_sb
) &&
2935 ext4_test_inode_state(inode
, EXT4_STATE_XATTR
)) {
2937 error
= ext4_get_inode_loc(inode
, &iloc
);
2939 EXT4_ERROR_INODE(inode
, "inode loc (error %d)", error
);
2943 error
= ext4_journal_get_write_access(handle
, inode
->i_sb
,
2944 iloc
.bh
, EXT4_JTR_NONE
);
2946 EXT4_ERROR_INODE(inode
, "write access (error %d)",
2951 header
= IHDR(inode
, ext4_raw_inode(&iloc
));
2952 if (header
->h_magic
== cpu_to_le32(EXT4_XATTR_MAGIC
))
2953 ext4_xattr_inode_dec_ref_all(handle
, inode
, iloc
.bh
,
2955 false /* block_csum */,
2958 false /* skip_quota */);
2961 if (EXT4_I(inode
)->i_file_acl
) {
2962 bh
= ext4_sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
, REQ_PRIO
);
2964 error
= PTR_ERR(bh
);
2965 if (error
== -EIO
) {
2966 EXT4_ERROR_INODE_ERR(inode
, EIO
,
2967 "block %llu read error",
2968 EXT4_I(inode
)->i_file_acl
);
2973 error
= ext4_xattr_check_block(inode
, bh
);
2977 if (ext4_has_feature_ea_inode(inode
->i_sb
)) {
2978 for (entry
= BFIRST(bh
); !IS_LAST_ENTRY(entry
);
2979 entry
= EXT4_XATTR_NEXT(entry
)) {
2980 if (!entry
->e_value_inum
)
2982 error
= ext4_xattr_inode_iget(inode
,
2983 le32_to_cpu(entry
->e_value_inum
),
2984 le32_to_cpu(entry
->e_hash
),
2988 ext4_xattr_inode_free_quota(inode
, ea_inode
,
2989 le32_to_cpu(entry
->e_value_size
));
2995 ext4_xattr_release_block(handle
, inode
, bh
, ea_inode_array
,
2998 * Update i_file_acl value in the same transaction that releases
3001 EXT4_I(inode
)->i_file_acl
= 0;
3002 error
= ext4_mark_inode_dirty(handle
, inode
);
3004 EXT4_ERROR_INODE(inode
, "mark inode dirty (error %d)",
3008 ext4_fc_mark_ineligible(inode
->i_sb
, EXT4_FC_REASON_XATTR
, handle
);
3017 void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array
*ea_inode_array
)
3021 if (ea_inode_array
== NULL
)
3024 for (idx
= 0; idx
< ea_inode_array
->count
; ++idx
)
3025 iput(ea_inode_array
->inodes
[idx
]);
3026 kfree(ea_inode_array
);
3030 * ext4_xattr_block_cache_insert()
3032 * Create a new entry in the extended attribute block cache, and insert
3033 * it unless such an entry is already in the cache.
3035 * Returns 0, or a negative error number on failure.
3038 ext4_xattr_block_cache_insert(struct mb_cache
*ea_block_cache
,
3039 struct buffer_head
*bh
)
3041 struct ext4_xattr_header
*header
= BHDR(bh
);
3042 __u32 hash
= le32_to_cpu(header
->h_hash
);
3043 int reusable
= le32_to_cpu(header
->h_refcount
) <
3044 EXT4_XATTR_REFCOUNT_MAX
;
3047 if (!ea_block_cache
)
3049 error
= mb_cache_entry_create(ea_block_cache
, GFP_NOFS
, hash
,
3050 bh
->b_blocknr
, reusable
);
3052 if (error
== -EBUSY
)
3053 ea_bdebug(bh
, "already in cache");
3055 ea_bdebug(bh
, "inserting [%x]", (int)hash
);
3061 * Compare two extended attribute blocks for equality.
3063 * Returns 0 if the blocks are equal, 1 if they differ, and
3064 * a negative error number on errors.
3067 ext4_xattr_cmp(struct ext4_xattr_header
*header1
,
3068 struct ext4_xattr_header
*header2
)
3070 struct ext4_xattr_entry
*entry1
, *entry2
;
3072 entry1
= ENTRY(header1
+1);
3073 entry2
= ENTRY(header2
+1);
3074 while (!IS_LAST_ENTRY(entry1
)) {
3075 if (IS_LAST_ENTRY(entry2
))
3077 if (entry1
->e_hash
!= entry2
->e_hash
||
3078 entry1
->e_name_index
!= entry2
->e_name_index
||
3079 entry1
->e_name_len
!= entry2
->e_name_len
||
3080 entry1
->e_value_size
!= entry2
->e_value_size
||
3081 entry1
->e_value_inum
!= entry2
->e_value_inum
||
3082 memcmp(entry1
->e_name
, entry2
->e_name
, entry1
->e_name_len
))
3084 if (!entry1
->e_value_inum
&&
3085 memcmp((char *)header1
+ le16_to_cpu(entry1
->e_value_offs
),
3086 (char *)header2
+ le16_to_cpu(entry2
->e_value_offs
),
3087 le32_to_cpu(entry1
->e_value_size
)))
3090 entry1
= EXT4_XATTR_NEXT(entry1
);
3091 entry2
= EXT4_XATTR_NEXT(entry2
);
3093 if (!IS_LAST_ENTRY(entry2
))
3099 * ext4_xattr_block_cache_find()
3101 * Find an identical extended attribute block.
3103 * Returns a pointer to the block found, or NULL if such a block was
3104 * not found or an error occurred.
3106 static struct buffer_head
*
3107 ext4_xattr_block_cache_find(struct inode
*inode
,
3108 struct ext4_xattr_header
*header
,
3109 struct mb_cache_entry
**pce
)
3111 __u32 hash
= le32_to_cpu(header
->h_hash
);
3112 struct mb_cache_entry
*ce
;
3113 struct mb_cache
*ea_block_cache
= EA_BLOCK_CACHE(inode
);
3115 if (!ea_block_cache
)
3117 if (!header
->h_hash
)
3118 return NULL
; /* never share */
3119 ea_idebug(inode
, "looking for cached blocks [%x]", (int)hash
);
3120 ce
= mb_cache_entry_find_first(ea_block_cache
, hash
);
3122 struct buffer_head
*bh
;
3124 bh
= ext4_sb_bread(inode
->i_sb
, ce
->e_value
, REQ_PRIO
);
3126 if (PTR_ERR(bh
) == -ENOMEM
)
3129 EXT4_ERROR_INODE(inode
, "block %lu read error",
3130 (unsigned long)ce
->e_value
);
3131 } else if (ext4_xattr_cmp(header
, BHDR(bh
)) == 0) {
3136 ce
= mb_cache_entry_find_next(ea_block_cache
, ce
);
3141 #define NAME_HASH_SHIFT 5
3142 #define VALUE_HASH_SHIFT 16
3145 * ext4_xattr_hash_entry()
3147 * Compute the hash of an extended attribute.
3149 static __le32
ext4_xattr_hash_entry(char *name
, size_t name_len
, __le32
*value
,
3154 while (name_len
--) {
3155 hash
= (hash
<< NAME_HASH_SHIFT
) ^
3156 (hash
>> (8*sizeof(hash
) - NAME_HASH_SHIFT
)) ^
3157 (unsigned char)*name
++;
3159 while (value_count
--) {
3160 hash
= (hash
<< VALUE_HASH_SHIFT
) ^
3161 (hash
>> (8*sizeof(hash
) - VALUE_HASH_SHIFT
)) ^
3162 le32_to_cpu(*value
++);
3164 return cpu_to_le32(hash
);
3168 * ext4_xattr_hash_entry_signed()
3170 * Compute the hash of an extended attribute incorrectly.
3172 static __le32
ext4_xattr_hash_entry_signed(char *name
, size_t name_len
, __le32
*value
, size_t value_count
)
3176 while (name_len
--) {
3177 hash
= (hash
<< NAME_HASH_SHIFT
) ^
3178 (hash
>> (8*sizeof(hash
) - NAME_HASH_SHIFT
)) ^
3179 (signed char)*name
++;
3181 while (value_count
--) {
3182 hash
= (hash
<< VALUE_HASH_SHIFT
) ^
3183 (hash
>> (8*sizeof(hash
) - VALUE_HASH_SHIFT
)) ^
3184 le32_to_cpu(*value
++);
3186 return cpu_to_le32(hash
);
3189 #undef NAME_HASH_SHIFT
3190 #undef VALUE_HASH_SHIFT
3192 #define BLOCK_HASH_SHIFT 16
3195 * ext4_xattr_rehash()
3197 * Re-compute the extended attribute hash value after an entry has changed.
3199 static void ext4_xattr_rehash(struct ext4_xattr_header
*header
)
3201 struct ext4_xattr_entry
*here
;
3204 here
= ENTRY(header
+1);
3205 while (!IS_LAST_ENTRY(here
)) {
3206 if (!here
->e_hash
) {
3207 /* Block is not shared if an entry's hash value == 0 */
3211 hash
= (hash
<< BLOCK_HASH_SHIFT
) ^
3212 (hash
>> (8*sizeof(hash
) - BLOCK_HASH_SHIFT
)) ^
3213 le32_to_cpu(here
->e_hash
);
3214 here
= EXT4_XATTR_NEXT(here
);
3216 header
->h_hash
= cpu_to_le32(hash
);
3219 #undef BLOCK_HASH_SHIFT
3221 #define HASH_BUCKET_BITS 10
3224 ext4_xattr_create_cache(void)
3226 return mb_cache_create(HASH_BUCKET_BITS
);
3229 void ext4_xattr_destroy_cache(struct mb_cache
*cache
)
3232 mb_cache_destroy(cache
);