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
;
196 /* Check the values */
197 while (!IS_LAST_ENTRY(entry
)) {
198 u32 size
= le32_to_cpu(entry
->e_value_size
);
200 if (size
> EXT4_XATTR_SIZE_MAX
)
201 return -EFSCORRUPTED
;
203 if (size
!= 0 && entry
->e_value_inum
== 0) {
204 u16 offs
= le16_to_cpu(entry
->e_value_offs
);
208 * The value cannot overlap the names, and the value
209 * with padding cannot extend beyond 'end'. Check both
210 * the padded and unpadded sizes, since the size may
211 * overflow to 0 when adding padding.
213 if (offs
> end
- value_start
)
214 return -EFSCORRUPTED
;
215 value
= value_start
+ offs
;
216 if (value
< (void *)e
+ sizeof(u32
) ||
217 size
> end
- value
||
218 EXT4_XATTR_SIZE(size
) > end
- value
)
219 return -EFSCORRUPTED
;
221 entry
= EXT4_XATTR_NEXT(entry
);
228 __ext4_xattr_check_block(struct inode
*inode
, struct buffer_head
*bh
,
229 const char *function
, unsigned int line
)
231 int error
= -EFSCORRUPTED
;
233 if (buffer_verified(bh
))
236 if (BHDR(bh
)->h_magic
!= cpu_to_le32(EXT4_XATTR_MAGIC
) ||
237 BHDR(bh
)->h_blocks
!= cpu_to_le32(1))
240 if (!ext4_xattr_block_csum_verify(inode
, bh
))
242 error
= ext4_xattr_check_entries(BFIRST(bh
), bh
->b_data
+ bh
->b_size
,
246 __ext4_error_inode(inode
, function
, line
, 0,
247 "corrupted xattr block %llu",
248 (unsigned long long) bh
->b_blocknr
);
250 set_buffer_verified(bh
);
254 #define ext4_xattr_check_block(inode, bh) \
255 __ext4_xattr_check_block((inode), (bh), __func__, __LINE__)
259 __xattr_check_inode(struct inode
*inode
, struct ext4_xattr_ibody_header
*header
,
260 void *end
, const char *function
, unsigned int line
)
262 int error
= -EFSCORRUPTED
;
264 if (end
- (void *)header
< sizeof(*header
) + sizeof(u32
) ||
265 (header
->h_magic
!= cpu_to_le32(EXT4_XATTR_MAGIC
)))
267 error
= ext4_xattr_check_entries(IFIRST(header
), end
, IFIRST(header
));
270 __ext4_error_inode(inode
, function
, line
, 0,
271 "corrupted in-inode xattr");
275 #define xattr_check_inode(inode, header, end) \
276 __xattr_check_inode((inode), (header), (end), __func__, __LINE__)
279 xattr_find_entry(struct inode
*inode
, struct ext4_xattr_entry
**pentry
,
280 void *end
, int name_index
, const char *name
, int sorted
)
282 struct ext4_xattr_entry
*entry
, *next
;
288 name_len
= strlen(name
);
289 for (entry
= *pentry
; !IS_LAST_ENTRY(entry
); entry
= next
) {
290 next
= EXT4_XATTR_NEXT(entry
);
291 if ((void *) next
>= end
) {
292 EXT4_ERROR_INODE(inode
, "corrupted xattr entries");
293 return -EFSCORRUPTED
;
295 cmp
= name_index
- entry
->e_name_index
;
297 cmp
= name_len
- entry
->e_name_len
;
299 cmp
= memcmp(name
, entry
->e_name
, name_len
);
300 if (cmp
<= 0 && (sorted
|| cmp
== 0))
304 return cmp
? -ENODATA
: 0;
308 ext4_xattr_inode_hash(struct ext4_sb_info
*sbi
, const void *buffer
, size_t size
)
310 return ext4_chksum(sbi
, sbi
->s_csum_seed
, buffer
, size
);
313 static u64
ext4_xattr_inode_get_ref(struct inode
*ea_inode
)
315 return ((u64
)ea_inode
->i_ctime
.tv_sec
<< 32) |
316 (u32
) inode_peek_iversion_raw(ea_inode
);
319 static void ext4_xattr_inode_set_ref(struct inode
*ea_inode
, u64 ref_count
)
321 ea_inode
->i_ctime
.tv_sec
= (u32
)(ref_count
>> 32);
322 inode_set_iversion_raw(ea_inode
, ref_count
& 0xffffffff);
325 static u32
ext4_xattr_inode_get_hash(struct inode
*ea_inode
)
327 return (u32
)ea_inode
->i_atime
.tv_sec
;
330 static void ext4_xattr_inode_set_hash(struct inode
*ea_inode
, u32 hash
)
332 ea_inode
->i_atime
.tv_sec
= hash
;
336 * Read the EA value from an inode.
338 static int ext4_xattr_inode_read(struct inode
*ea_inode
, void *buf
, size_t size
)
340 int blocksize
= 1 << ea_inode
->i_blkbits
;
341 int bh_count
= (size
+ blocksize
- 1) >> ea_inode
->i_blkbits
;
342 int tail_size
= (size
% blocksize
) ?: blocksize
;
343 struct buffer_head
*bhs_inline
[8];
344 struct buffer_head
**bhs
= bhs_inline
;
347 if (bh_count
> ARRAY_SIZE(bhs_inline
)) {
348 bhs
= kmalloc_array(bh_count
, sizeof(*bhs
), GFP_NOFS
);
353 ret
= ext4_bread_batch(ea_inode
, 0 /* block */, bh_count
,
354 true /* wait */, bhs
);
358 for (i
= 0; i
< bh_count
; i
++) {
359 /* There shouldn't be any holes in ea_inode. */
364 memcpy((char *)buf
+ blocksize
* i
, bhs
[i
]->b_data
,
365 i
< bh_count
- 1 ? blocksize
: tail_size
);
369 for (i
= 0; i
< bh_count
; i
++)
372 if (bhs
!= bhs_inline
)
377 #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec)
379 static int ext4_xattr_inode_iget(struct inode
*parent
, unsigned long ea_ino
,
380 u32 ea_inode_hash
, struct inode
**ea_inode
)
385 inode
= ext4_iget(parent
->i_sb
, ea_ino
);
387 err
= PTR_ERR(inode
);
388 ext4_error(parent
->i_sb
,
389 "error while reading EA inode %lu err=%d", ea_ino
,
394 if (is_bad_inode(inode
)) {
395 ext4_error(parent
->i_sb
,
396 "error while reading EA inode %lu is_bad_inode",
402 if (!(EXT4_I(inode
)->i_flags
& EXT4_EA_INODE_FL
)) {
403 ext4_error(parent
->i_sb
,
404 "EA inode %lu does not have EXT4_EA_INODE_FL flag",
410 ext4_xattr_inode_set_class(inode
);
413 * Check whether this is an old Lustre-style xattr inode. Lustre
414 * implementation does not have hash validation, rather it has a
415 * backpointer from ea_inode to the parent inode.
417 if (ea_inode_hash
!= ext4_xattr_inode_get_hash(inode
) &&
418 EXT4_XATTR_INODE_GET_PARENT(inode
) == parent
->i_ino
&&
419 inode
->i_generation
== parent
->i_generation
) {
420 ext4_set_inode_state(inode
, EXT4_STATE_LUSTRE_EA_INODE
);
421 ext4_xattr_inode_set_ref(inode
, 1);
424 inode
->i_flags
|= S_NOQUOTA
;
436 ext4_xattr_inode_verify_hashes(struct inode
*ea_inode
,
437 struct ext4_xattr_entry
*entry
, void *buffer
,
442 /* Verify stored hash matches calculated hash. */
443 hash
= ext4_xattr_inode_hash(EXT4_SB(ea_inode
->i_sb
), buffer
, size
);
444 if (hash
!= ext4_xattr_inode_get_hash(ea_inode
))
445 return -EFSCORRUPTED
;
448 __le32 e_hash
, tmp_data
;
450 /* Verify entry hash. */
451 tmp_data
= cpu_to_le32(hash
);
452 e_hash
= ext4_xattr_hash_entry(entry
->e_name
, entry
->e_name_len
,
454 if (e_hash
!= entry
->e_hash
)
455 return -EFSCORRUPTED
;
461 * Read xattr value from the EA inode.
464 ext4_xattr_inode_get(struct inode
*inode
, struct ext4_xattr_entry
*entry
,
465 void *buffer
, size_t size
)
467 struct mb_cache
*ea_inode_cache
= EA_INODE_CACHE(inode
);
468 struct inode
*ea_inode
;
471 err
= ext4_xattr_inode_iget(inode
, le32_to_cpu(entry
->e_value_inum
),
472 le32_to_cpu(entry
->e_hash
), &ea_inode
);
478 if (i_size_read(ea_inode
) != size
) {
479 ext4_warning_inode(ea_inode
,
480 "ea_inode file size=%llu entry size=%zu",
481 i_size_read(ea_inode
), size
);
486 err
= ext4_xattr_inode_read(ea_inode
, buffer
, size
);
490 if (!ext4_test_inode_state(ea_inode
, EXT4_STATE_LUSTRE_EA_INODE
)) {
491 err
= ext4_xattr_inode_verify_hashes(ea_inode
, entry
, buffer
,
494 ext4_warning_inode(ea_inode
,
495 "EA inode hash validation failed");
500 mb_cache_entry_create(ea_inode_cache
, GFP_NOFS
,
501 ext4_xattr_inode_get_hash(ea_inode
),
502 ea_inode
->i_ino
, true /* reusable */);
510 ext4_xattr_block_get(struct inode
*inode
, int name_index
, const char *name
,
511 void *buffer
, size_t buffer_size
)
513 struct buffer_head
*bh
= NULL
;
514 struct ext4_xattr_entry
*entry
;
518 struct mb_cache
*ea_block_cache
= EA_BLOCK_CACHE(inode
);
520 ea_idebug(inode
, "name=%d.%s, buffer=%p, buffer_size=%ld",
521 name_index
, name
, buffer
, (long)buffer_size
);
524 if (!EXT4_I(inode
)->i_file_acl
)
526 ea_idebug(inode
, "reading block %llu",
527 (unsigned long long)EXT4_I(inode
)->i_file_acl
);
528 bh
= sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
);
531 ea_bdebug(bh
, "b_count=%d, refcount=%d",
532 atomic_read(&(bh
->b_count
)), le32_to_cpu(BHDR(bh
)->h_refcount
));
533 error
= ext4_xattr_check_block(inode
, bh
);
536 ext4_xattr_block_cache_insert(ea_block_cache
, bh
);
538 end
= bh
->b_data
+ bh
->b_size
;
539 error
= xattr_find_entry(inode
, &entry
, end
, name_index
, name
, 1);
542 size
= le32_to_cpu(entry
->e_value_size
);
544 if (unlikely(size
> EXT4_XATTR_SIZE_MAX
))
547 if (size
> buffer_size
)
549 if (entry
->e_value_inum
) {
550 error
= ext4_xattr_inode_get(inode
, entry
, buffer
,
555 u16 offset
= le16_to_cpu(entry
->e_value_offs
);
556 void *p
= bh
->b_data
+ offset
;
558 if (unlikely(p
+ size
> end
))
560 memcpy(buffer
, p
, size
);
571 ext4_xattr_ibody_get(struct inode
*inode
, int name_index
, const char *name
,
572 void *buffer
, size_t buffer_size
)
574 struct ext4_xattr_ibody_header
*header
;
575 struct ext4_xattr_entry
*entry
;
576 struct ext4_inode
*raw_inode
;
577 struct ext4_iloc iloc
;
582 if (!ext4_test_inode_state(inode
, EXT4_STATE_XATTR
))
584 error
= ext4_get_inode_loc(inode
, &iloc
);
587 raw_inode
= ext4_raw_inode(&iloc
);
588 header
= IHDR(inode
, raw_inode
);
589 end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
590 error
= xattr_check_inode(inode
, header
, end
);
593 entry
= IFIRST(header
);
594 error
= xattr_find_entry(inode
, &entry
, end
, name_index
, name
, 0);
597 size
= le32_to_cpu(entry
->e_value_size
);
599 if (unlikely(size
> EXT4_XATTR_SIZE_MAX
))
602 if (size
> buffer_size
)
604 if (entry
->e_value_inum
) {
605 error
= ext4_xattr_inode_get(inode
, entry
, buffer
,
610 u16 offset
= le16_to_cpu(entry
->e_value_offs
);
611 void *p
= (void *)IFIRST(header
) + offset
;
613 if (unlikely(p
+ size
> end
))
615 memcpy(buffer
, p
, size
);
628 * Copy an extended attribute into the buffer
629 * provided, or compute the buffer size required.
630 * Buffer is NULL to compute the size of the buffer required.
632 * Returns a negative error number on failure, or the number of bytes
633 * used / required on success.
636 ext4_xattr_get(struct inode
*inode
, int name_index
, const char *name
,
637 void *buffer
, size_t buffer_size
)
641 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
644 if (strlen(name
) > 255)
647 down_read(&EXT4_I(inode
)->xattr_sem
);
648 error
= ext4_xattr_ibody_get(inode
, name_index
, name
, buffer
,
650 if (error
== -ENODATA
)
651 error
= ext4_xattr_block_get(inode
, name_index
, name
, buffer
,
653 up_read(&EXT4_I(inode
)->xattr_sem
);
658 ext4_xattr_list_entries(struct dentry
*dentry
, struct ext4_xattr_entry
*entry
,
659 char *buffer
, size_t buffer_size
)
661 size_t rest
= buffer_size
;
663 for (; !IS_LAST_ENTRY(entry
); entry
= EXT4_XATTR_NEXT(entry
)) {
664 const struct xattr_handler
*handler
=
665 ext4_xattr_handler(entry
->e_name_index
);
667 if (handler
&& (!handler
->list
|| handler
->list(dentry
))) {
668 const char *prefix
= handler
->prefix
?: handler
->name
;
669 size_t prefix_len
= strlen(prefix
);
670 size_t size
= prefix_len
+ entry
->e_name_len
+ 1;
675 memcpy(buffer
, prefix
, prefix_len
);
676 buffer
+= prefix_len
;
677 memcpy(buffer
, entry
->e_name
, entry
->e_name_len
);
678 buffer
+= entry
->e_name_len
;
684 return buffer_size
- rest
; /* total size */
688 ext4_xattr_block_list(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
690 struct inode
*inode
= d_inode(dentry
);
691 struct buffer_head
*bh
= NULL
;
694 ea_idebug(inode
, "buffer=%p, buffer_size=%ld",
695 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
= sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
);
706 ea_bdebug(bh
, "b_count=%d, refcount=%d",
707 atomic_read(&(bh
->b_count
)), le32_to_cpu(BHDR(bh
)->h_refcount
));
708 error
= ext4_xattr_check_block(inode
, bh
);
711 ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode
), bh
);
712 error
= ext4_xattr_list_entries(dentry
, BFIRST(bh
), buffer
, buffer_size
);
721 ext4_xattr_ibody_list(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
723 struct inode
*inode
= d_inode(dentry
);
724 struct ext4_xattr_ibody_header
*header
;
725 struct ext4_inode
*raw_inode
;
726 struct ext4_iloc iloc
;
730 if (!ext4_test_inode_state(inode
, EXT4_STATE_XATTR
))
732 error
= ext4_get_inode_loc(inode
, &iloc
);
735 raw_inode
= ext4_raw_inode(&iloc
);
736 header
= IHDR(inode
, raw_inode
);
737 end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
738 error
= xattr_check_inode(inode
, header
, end
);
741 error
= ext4_xattr_list_entries(dentry
, IFIRST(header
),
742 buffer
, buffer_size
);
750 * Inode operation listxattr()
752 * d_inode(dentry)->i_rwsem: don't care
754 * Copy a list of attribute names into the buffer
755 * provided, or compute the buffer size required.
756 * Buffer is NULL to compute the size of the buffer required.
758 * Returns a negative error number on failure, or the number of bytes
759 * used / required on success.
762 ext4_listxattr(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
766 down_read(&EXT4_I(d_inode(dentry
))->xattr_sem
);
767 ret
= ret2
= ext4_xattr_ibody_list(dentry
, buffer
, buffer_size
);
774 ret
= ext4_xattr_block_list(dentry
, buffer
, buffer_size
);
779 up_read(&EXT4_I(d_inode(dentry
))->xattr_sem
);
784 * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is
787 static void ext4_xattr_update_super_block(handle_t
*handle
,
788 struct super_block
*sb
)
790 if (ext4_has_feature_xattr(sb
))
793 BUFFER_TRACE(EXT4_SB(sb
)->s_sbh
, "get_write_access");
794 if (ext4_journal_get_write_access(handle
, EXT4_SB(sb
)->s_sbh
) == 0) {
795 ext4_set_feature_xattr(sb
);
796 ext4_handle_dirty_super(handle
, sb
);
800 int ext4_get_inode_usage(struct inode
*inode
, qsize_t
*usage
)
802 struct ext4_iloc iloc
= { .bh
= NULL
};
803 struct buffer_head
*bh
= NULL
;
804 struct ext4_inode
*raw_inode
;
805 struct ext4_xattr_ibody_header
*header
;
806 struct ext4_xattr_entry
*entry
;
807 qsize_t ea_inode_refs
= 0;
811 lockdep_assert_held_read(&EXT4_I(inode
)->xattr_sem
);
813 if (ext4_test_inode_state(inode
, EXT4_STATE_XATTR
)) {
814 ret
= ext4_get_inode_loc(inode
, &iloc
);
817 raw_inode
= ext4_raw_inode(&iloc
);
818 header
= IHDR(inode
, raw_inode
);
819 end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
820 ret
= xattr_check_inode(inode
, header
, end
);
824 for (entry
= IFIRST(header
); !IS_LAST_ENTRY(entry
);
825 entry
= EXT4_XATTR_NEXT(entry
))
826 if (entry
->e_value_inum
)
830 if (EXT4_I(inode
)->i_file_acl
) {
831 bh
= sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
);
837 ret
= ext4_xattr_check_block(inode
, bh
);
841 for (entry
= BFIRST(bh
); !IS_LAST_ENTRY(entry
);
842 entry
= EXT4_XATTR_NEXT(entry
))
843 if (entry
->e_value_inum
)
846 *usage
= ea_inode_refs
+ 1;
854 static inline size_t round_up_cluster(struct inode
*inode
, size_t length
)
856 struct super_block
*sb
= inode
->i_sb
;
857 size_t cluster_size
= 1 << (EXT4_SB(sb
)->s_cluster_bits
+
859 size_t mask
= ~(cluster_size
- 1);
861 return (length
+ cluster_size
- 1) & mask
;
864 static int ext4_xattr_inode_alloc_quota(struct inode
*inode
, size_t len
)
868 err
= dquot_alloc_inode(inode
);
871 err
= dquot_alloc_space_nodirty(inode
, round_up_cluster(inode
, len
));
873 dquot_free_inode(inode
);
877 static void ext4_xattr_inode_free_quota(struct inode
*parent
,
878 struct inode
*ea_inode
,
882 ext4_test_inode_state(ea_inode
, EXT4_STATE_LUSTRE_EA_INODE
))
884 dquot_free_space_nodirty(parent
, round_up_cluster(parent
, len
));
885 dquot_free_inode(parent
);
888 int __ext4_xattr_set_credits(struct super_block
*sb
, struct inode
*inode
,
889 struct buffer_head
*block_bh
, size_t value_len
,
896 * 1) Owner inode update
897 * 2) Ref count update on old xattr block
899 * 4) block bitmap update for new xattr block
900 * 5) group descriptor for new xattr block
901 * 6) block bitmap update for old xattr block
902 * 7) group descriptor for old block
904 * 6 & 7 can happen if we have two racing threads T_a and T_b
905 * which are each trying to set an xattr on inodes I_a and I_b
906 * which were both initially sharing an xattr block.
911 credits
+= EXT4_MAXQUOTAS_TRANS_BLOCKS(sb
);
914 * In case of inline data, we may push out the data to a block,
915 * so we need to reserve credits for this eventuality
917 if (inode
&& ext4_has_inline_data(inode
))
918 credits
+= ext4_writepage_trans_blocks(inode
) + 1;
920 /* We are done if ea_inode feature is not enabled. */
921 if (!ext4_has_feature_ea_inode(sb
))
924 /* New ea_inode, inode map, block bitmap, group descriptor. */
928 blocks
= (value_len
+ sb
->s_blocksize
- 1) >> sb
->s_blocksize_bits
;
930 /* Indirection block or one level of extent tree. */
933 /* Block bitmap and group descriptor updates for each block. */
934 credits
+= blocks
* 2;
936 /* Blocks themselves. */
940 /* Dereference ea_inode holding old xattr value.
941 * Old ea_inode, inode map, block bitmap, group descriptor.
945 /* Data blocks for old ea_inode. */
946 blocks
= XATTR_SIZE_MAX
>> sb
->s_blocksize_bits
;
948 /* Indirection block or one level of extent tree for old
953 /* Block bitmap and group descriptor updates for each block. */
954 credits
+= blocks
* 2;
957 /* We may need to clone the existing xattr block in which case we need
958 * to increment ref counts for existing ea_inodes referenced by it.
961 struct ext4_xattr_entry
*entry
= BFIRST(block_bh
);
963 for (; !IS_LAST_ENTRY(entry
); entry
= EXT4_XATTR_NEXT(entry
))
964 if (entry
->e_value_inum
)
965 /* Ref count update on ea_inode. */
971 static int ext4_xattr_ensure_credits(handle_t
*handle
, struct inode
*inode
,
972 int credits
, struct buffer_head
*bh
,
973 bool dirty
, bool block_csum
)
977 if (!ext4_handle_valid(handle
))
980 if (handle
->h_buffer_credits
>= credits
)
983 error
= ext4_journal_extend(handle
, credits
- handle
->h_buffer_credits
);
987 ext4_warning(inode
->i_sb
, "Extend journal (error %d)", error
);
993 ext4_xattr_block_csum_set(inode
, bh
);
994 error
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
996 ext4_warning(inode
->i_sb
, "Handle metadata (error %d)",
1002 error
= ext4_journal_restart(handle
, credits
);
1004 ext4_warning(inode
->i_sb
, "Restart journal (error %d)", error
);
1009 error
= ext4_journal_get_write_access(handle
, bh
);
1011 ext4_warning(inode
->i_sb
,
1012 "Get write access failed (error %d)",
1020 static int ext4_xattr_inode_update_ref(handle_t
*handle
, struct inode
*ea_inode
,
1023 struct mb_cache
*ea_inode_cache
= EA_INODE_CACHE(ea_inode
);
1024 struct ext4_iloc iloc
;
1029 inode_lock(ea_inode
);
1031 ret
= ext4_reserve_inode_write(handle
, ea_inode
, &iloc
);
1037 ref_count
= ext4_xattr_inode_get_ref(ea_inode
);
1038 ref_count
+= ref_change
;
1039 ext4_xattr_inode_set_ref(ea_inode
, ref_count
);
1041 if (ref_change
> 0) {
1042 WARN_ONCE(ref_count
<= 0, "EA inode %lu ref_count=%lld",
1043 ea_inode
->i_ino
, ref_count
);
1045 if (ref_count
== 1) {
1046 WARN_ONCE(ea_inode
->i_nlink
, "EA inode %lu i_nlink=%u",
1047 ea_inode
->i_ino
, ea_inode
->i_nlink
);
1049 set_nlink(ea_inode
, 1);
1050 ext4_orphan_del(handle
, ea_inode
);
1052 if (ea_inode_cache
) {
1053 hash
= ext4_xattr_inode_get_hash(ea_inode
);
1054 mb_cache_entry_create(ea_inode_cache
,
1057 true /* reusable */);
1061 WARN_ONCE(ref_count
< 0, "EA inode %lu ref_count=%lld",
1062 ea_inode
->i_ino
, ref_count
);
1064 if (ref_count
== 0) {
1065 WARN_ONCE(ea_inode
->i_nlink
!= 1,
1066 "EA inode %lu i_nlink=%u",
1067 ea_inode
->i_ino
, ea_inode
->i_nlink
);
1069 clear_nlink(ea_inode
);
1070 ext4_orphan_add(handle
, ea_inode
);
1072 if (ea_inode_cache
) {
1073 hash
= ext4_xattr_inode_get_hash(ea_inode
);
1074 mb_cache_entry_delete(ea_inode_cache
, hash
,
1080 ret
= ext4_mark_iloc_dirty(handle
, ea_inode
, &iloc
);
1083 ext4_warning_inode(ea_inode
,
1084 "ext4_mark_iloc_dirty() failed ret=%d", ret
);
1087 inode_unlock(ea_inode
);
1091 static int ext4_xattr_inode_inc_ref(handle_t
*handle
, struct inode
*ea_inode
)
1093 return ext4_xattr_inode_update_ref(handle
, ea_inode
, 1);
1096 static int ext4_xattr_inode_dec_ref(handle_t
*handle
, struct inode
*ea_inode
)
1098 return ext4_xattr_inode_update_ref(handle
, ea_inode
, -1);
1101 static int ext4_xattr_inode_inc_ref_all(handle_t
*handle
, struct inode
*parent
,
1102 struct ext4_xattr_entry
*first
)
1104 struct inode
*ea_inode
;
1105 struct ext4_xattr_entry
*entry
;
1106 struct ext4_xattr_entry
*failed_entry
;
1107 unsigned int ea_ino
;
1110 for (entry
= first
; !IS_LAST_ENTRY(entry
);
1111 entry
= EXT4_XATTR_NEXT(entry
)) {
1112 if (!entry
->e_value_inum
)
1114 ea_ino
= le32_to_cpu(entry
->e_value_inum
);
1115 err
= ext4_xattr_inode_iget(parent
, ea_ino
,
1116 le32_to_cpu(entry
->e_hash
),
1120 err
= ext4_xattr_inode_inc_ref(handle
, ea_inode
);
1122 ext4_warning_inode(ea_inode
, "inc ref error %d", err
);
1132 failed_entry
= entry
;
1134 for (entry
= first
; entry
!= failed_entry
;
1135 entry
= EXT4_XATTR_NEXT(entry
)) {
1136 if (!entry
->e_value_inum
)
1138 ea_ino
= le32_to_cpu(entry
->e_value_inum
);
1139 err
= ext4_xattr_inode_iget(parent
, ea_ino
,
1140 le32_to_cpu(entry
->e_hash
),
1143 ext4_warning(parent
->i_sb
,
1144 "cleanup ea_ino %u iget error %d", ea_ino
,
1148 err
= ext4_xattr_inode_dec_ref(handle
, ea_inode
);
1150 ext4_warning_inode(ea_inode
, "cleanup dec ref error %d",
1158 ext4_xattr_inode_dec_ref_all(handle_t
*handle
, struct inode
*parent
,
1159 struct buffer_head
*bh
,
1160 struct ext4_xattr_entry
*first
, bool block_csum
,
1161 struct ext4_xattr_inode_array
**ea_inode_array
,
1162 int extra_credits
, bool skip_quota
)
1164 struct inode
*ea_inode
;
1165 struct ext4_xattr_entry
*entry
;
1167 unsigned int ea_ino
;
1171 /* One credit for dec ref on ea_inode, one for orphan list addition, */
1172 credits
= 2 + extra_credits
;
1174 for (entry
= first
; !IS_LAST_ENTRY(entry
);
1175 entry
= EXT4_XATTR_NEXT(entry
)) {
1176 if (!entry
->e_value_inum
)
1178 ea_ino
= le32_to_cpu(entry
->e_value_inum
);
1179 err
= ext4_xattr_inode_iget(parent
, ea_ino
,
1180 le32_to_cpu(entry
->e_hash
),
1185 err
= ext4_expand_inode_array(ea_inode_array
, ea_inode
);
1187 ext4_warning_inode(ea_inode
,
1188 "Expand inode array err=%d", err
);
1193 err
= ext4_xattr_ensure_credits(handle
, parent
, credits
, bh
,
1196 ext4_warning_inode(ea_inode
, "Ensure credits err=%d",
1201 err
= ext4_xattr_inode_dec_ref(handle
, ea_inode
);
1203 ext4_warning_inode(ea_inode
, "ea_inode dec ref err=%d",
1209 ext4_xattr_inode_free_quota(parent
, ea_inode
,
1210 le32_to_cpu(entry
->e_value_size
));
1213 * Forget about ea_inode within the same transaction that
1214 * decrements the ref count. This avoids duplicate decrements in
1215 * case the rest of the work spills over to subsequent
1218 entry
->e_value_inum
= 0;
1219 entry
->e_value_size
= 0;
1226 * Note that we are deliberately skipping csum calculation for
1227 * the final update because we do not expect any journal
1228 * restarts until xattr block is freed.
1231 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
1233 ext4_warning_inode(parent
,
1234 "handle dirty metadata err=%d", err
);
1239 * Release the xattr block BH: If the reference count is > 1, decrement it;
1240 * otherwise free the block.
1243 ext4_xattr_release_block(handle_t
*handle
, struct inode
*inode
,
1244 struct buffer_head
*bh
,
1245 struct ext4_xattr_inode_array
**ea_inode_array
,
1248 struct mb_cache
*ea_block_cache
= EA_BLOCK_CACHE(inode
);
1252 BUFFER_TRACE(bh
, "get_write_access");
1253 error
= ext4_journal_get_write_access(handle
, bh
);
1258 hash
= le32_to_cpu(BHDR(bh
)->h_hash
);
1259 ref
= le32_to_cpu(BHDR(bh
)->h_refcount
);
1261 ea_bdebug(bh
, "refcount now=0; freeing");
1263 * This must happen under buffer lock for
1264 * ext4_xattr_block_set() to reliably detect freed block
1267 mb_cache_entry_delete(ea_block_cache
, hash
,
1272 if (ext4_has_feature_ea_inode(inode
->i_sb
))
1273 ext4_xattr_inode_dec_ref_all(handle
, inode
, bh
,
1275 true /* block_csum */,
1278 true /* skip_quota */);
1279 ext4_free_blocks(handle
, inode
, bh
, 0, 1,
1280 EXT4_FREE_BLOCKS_METADATA
|
1281 EXT4_FREE_BLOCKS_FORGET
);
1284 BHDR(bh
)->h_refcount
= cpu_to_le32(ref
);
1285 if (ref
== EXT4_XATTR_REFCOUNT_MAX
- 1) {
1286 struct mb_cache_entry
*ce
;
1288 if (ea_block_cache
) {
1289 ce
= mb_cache_entry_get(ea_block_cache
, hash
,
1293 mb_cache_entry_put(ea_block_cache
, ce
);
1298 ext4_xattr_block_csum_set(inode
, bh
);
1300 * Beware of this ugliness: Releasing of xattr block references
1301 * from different inodes can race and so we have to protect
1302 * from a race where someone else frees the block (and releases
1303 * its journal_head) before we are done dirtying the buffer. In
1304 * nojournal mode this race is harmless and we actually cannot
1305 * call ext4_handle_dirty_metadata() with locked buffer as
1306 * that function can call sync_dirty_buffer() so for that case
1307 * we handle the dirtying after unlocking the buffer.
1309 if (ext4_handle_valid(handle
))
1310 error
= ext4_handle_dirty_metadata(handle
, inode
, bh
);
1312 if (!ext4_handle_valid(handle
))
1313 error
= ext4_handle_dirty_metadata(handle
, inode
, bh
);
1315 ext4_handle_sync(handle
);
1316 dquot_free_block(inode
, EXT4_C2B(EXT4_SB(inode
->i_sb
), 1));
1317 ea_bdebug(bh
, "refcount now=%d; releasing",
1318 le32_to_cpu(BHDR(bh
)->h_refcount
));
1321 ext4_std_error(inode
->i_sb
, error
);
1326 * Find the available free space for EAs. This also returns the total number of
1327 * bytes used by EA entries.
1329 static size_t ext4_xattr_free_space(struct ext4_xattr_entry
*last
,
1330 size_t *min_offs
, void *base
, int *total
)
1332 for (; !IS_LAST_ENTRY(last
); last
= EXT4_XATTR_NEXT(last
)) {
1333 if (!last
->e_value_inum
&& last
->e_value_size
) {
1334 size_t offs
= le16_to_cpu(last
->e_value_offs
);
1335 if (offs
< *min_offs
)
1339 *total
+= EXT4_XATTR_LEN(last
->e_name_len
);
1341 return (*min_offs
- ((void *)last
- base
) - sizeof(__u32
));
1345 * Write the value of the EA in an inode.
1347 static int ext4_xattr_inode_write(handle_t
*handle
, struct inode
*ea_inode
,
1348 const void *buf
, int bufsize
)
1350 struct buffer_head
*bh
= NULL
;
1351 unsigned long block
= 0;
1352 int blocksize
= ea_inode
->i_sb
->s_blocksize
;
1353 int max_blocks
= (bufsize
+ blocksize
- 1) >> ea_inode
->i_blkbits
;
1354 int csize
, wsize
= 0;
1359 while (ret
>= 0 && ret
< max_blocks
) {
1360 struct ext4_map_blocks map
;
1361 map
.m_lblk
= block
+= ret
;
1362 map
.m_len
= max_blocks
-= ret
;
1364 ret
= ext4_map_blocks(handle
, ea_inode
, &map
,
1365 EXT4_GET_BLOCKS_CREATE
);
1367 ext4_mark_inode_dirty(handle
, ea_inode
);
1368 if (ret
== -ENOSPC
&&
1369 ext4_should_retry_alloc(ea_inode
->i_sb
, &retries
)) {
1381 while (wsize
< bufsize
) {
1384 csize
= (bufsize
- wsize
) > blocksize
? blocksize
:
1386 bh
= ext4_getblk(handle
, ea_inode
, block
, 0);
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
);
1486 if (!IS_ERR(ea_inode
) &&
1487 !is_bad_inode(ea_inode
) &&
1488 (EXT4_I(ea_inode
)->i_flags
& EXT4_EA_INODE_FL
) &&
1489 i_size_read(ea_inode
) == value_len
&&
1490 !ext4_xattr_inode_read(ea_inode
, ea_data
, value_len
) &&
1491 !ext4_xattr_inode_verify_hashes(ea_inode
, NULL
, ea_data
,
1493 !memcmp(value
, ea_data
, value_len
)) {
1494 mb_cache_entry_touch(ea_inode_cache
, ce
);
1495 mb_cache_entry_put(ea_inode_cache
, ce
);
1500 if (!IS_ERR(ea_inode
))
1502 ce
= mb_cache_entry_find_next(ea_inode_cache
, ce
);
1509 * Add value of the EA in an inode.
1511 static int ext4_xattr_inode_lookup_create(handle_t
*handle
, struct inode
*inode
,
1512 const void *value
, size_t value_len
,
1513 struct inode
**ret_inode
)
1515 struct inode
*ea_inode
;
1519 hash
= ext4_xattr_inode_hash(EXT4_SB(inode
->i_sb
), value
, value_len
);
1520 ea_inode
= ext4_xattr_inode_cache_find(inode
, value
, value_len
, hash
);
1522 err
= ext4_xattr_inode_inc_ref(handle
, ea_inode
);
1528 *ret_inode
= ea_inode
;
1532 /* Create an inode for the EA value */
1533 ea_inode
= ext4_xattr_inode_create(handle
, inode
, hash
);
1534 if (IS_ERR(ea_inode
))
1535 return PTR_ERR(ea_inode
);
1537 err
= ext4_xattr_inode_write(handle
, ea_inode
, value
, value_len
);
1539 ext4_xattr_inode_dec_ref(handle
, ea_inode
);
1544 if (EA_INODE_CACHE(inode
))
1545 mb_cache_entry_create(EA_INODE_CACHE(inode
), GFP_NOFS
, hash
,
1546 ea_inode
->i_ino
, true /* reusable */);
1548 *ret_inode
= ea_inode
;
1553 * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode
1554 * feature is enabled.
1556 #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U)
1558 static int ext4_xattr_set_entry(struct ext4_xattr_info
*i
,
1559 struct ext4_xattr_search
*s
,
1560 handle_t
*handle
, struct inode
*inode
,
1563 struct ext4_xattr_entry
*last
;
1564 struct ext4_xattr_entry
*here
= s
->here
;
1565 size_t min_offs
= s
->end
- s
->base
, name_len
= strlen(i
->name
);
1566 int in_inode
= i
->in_inode
;
1567 struct inode
*old_ea_inode
= NULL
;
1568 struct inode
*new_ea_inode
= NULL
;
1569 size_t old_size
, new_size
;
1572 /* Space used by old and new values. */
1573 old_size
= (!s
->not_found
&& !here
->e_value_inum
) ?
1574 EXT4_XATTR_SIZE(le32_to_cpu(here
->e_value_size
)) : 0;
1575 new_size
= (i
->value
&& !in_inode
) ? EXT4_XATTR_SIZE(i
->value_len
) : 0;
1578 * Optimization for the simple case when old and new values have the
1579 * same padded sizes. Not applicable if external inodes are involved.
1581 if (new_size
&& new_size
== old_size
) {
1582 size_t offs
= le16_to_cpu(here
->e_value_offs
);
1583 void *val
= s
->base
+ offs
;
1585 here
->e_value_size
= cpu_to_le32(i
->value_len
);
1586 if (i
->value
== EXT4_ZERO_XATTR_VALUE
) {
1587 memset(val
, 0, new_size
);
1589 memcpy(val
, i
->value
, i
->value_len
);
1590 /* Clear padding bytes. */
1591 memset(val
+ i
->value_len
, 0, new_size
- i
->value_len
);
1596 /* Compute min_offs and last. */
1598 for (; !IS_LAST_ENTRY(last
); last
= EXT4_XATTR_NEXT(last
)) {
1599 if (!last
->e_value_inum
&& last
->e_value_size
) {
1600 size_t offs
= le16_to_cpu(last
->e_value_offs
);
1601 if (offs
< min_offs
)
1606 /* Check whether we have enough space. */
1610 free
= min_offs
- ((void *)last
- s
->base
) - sizeof(__u32
);
1612 free
+= EXT4_XATTR_LEN(name_len
) + old_size
;
1614 if (free
< EXT4_XATTR_LEN(name_len
) + new_size
) {
1620 * If storing the value in an external inode is an option,
1621 * reserve space for xattr entries/names in the external
1622 * attribute block so that a long value does not occupy the
1623 * whole space and prevent futher entries being added.
1625 if (ext4_has_feature_ea_inode(inode
->i_sb
) &&
1626 new_size
&& is_block
&&
1627 (min_offs
+ old_size
- new_size
) <
1628 EXT4_XATTR_BLOCK_RESERVE(inode
)) {
1635 * Getting access to old and new ea inodes is subject to failures.
1636 * Finish that work before doing any modifications to the xattr data.
1638 if (!s
->not_found
&& here
->e_value_inum
) {
1639 ret
= ext4_xattr_inode_iget(inode
,
1640 le32_to_cpu(here
->e_value_inum
),
1641 le32_to_cpu(here
->e_hash
),
1644 old_ea_inode
= NULL
;
1648 if (i
->value
&& in_inode
) {
1649 WARN_ON_ONCE(!i
->value_len
);
1651 ret
= ext4_xattr_inode_alloc_quota(inode
, i
->value_len
);
1655 ret
= ext4_xattr_inode_lookup_create(handle
, inode
, i
->value
,
1659 new_ea_inode
= NULL
;
1660 ext4_xattr_inode_free_quota(inode
, NULL
, i
->value_len
);
1666 /* We are ready to release ref count on the old_ea_inode. */
1667 ret
= ext4_xattr_inode_dec_ref(handle
, old_ea_inode
);
1669 /* Release newly required ref count on new_ea_inode. */
1673 err
= ext4_xattr_inode_dec_ref(handle
,
1676 ext4_warning_inode(new_ea_inode
,
1677 "dec ref new_ea_inode err=%d",
1679 ext4_xattr_inode_free_quota(inode
, new_ea_inode
,
1685 ext4_xattr_inode_free_quota(inode
, old_ea_inode
,
1686 le32_to_cpu(here
->e_value_size
));
1689 /* No failures allowed past this point. */
1691 if (!s
->not_found
&& here
->e_value_size
&& here
->e_value_offs
) {
1692 /* Remove the old value. */
1693 void *first_val
= s
->base
+ min_offs
;
1694 size_t offs
= le16_to_cpu(here
->e_value_offs
);
1695 void *val
= s
->base
+ offs
;
1697 memmove(first_val
+ old_size
, first_val
, val
- first_val
);
1698 memset(first_val
, 0, old_size
);
1699 min_offs
+= old_size
;
1701 /* Adjust all value offsets. */
1703 while (!IS_LAST_ENTRY(last
)) {
1704 size_t o
= le16_to_cpu(last
->e_value_offs
);
1706 if (!last
->e_value_inum
&&
1707 last
->e_value_size
&& o
< offs
)
1708 last
->e_value_offs
= cpu_to_le16(o
+ old_size
);
1709 last
= EXT4_XATTR_NEXT(last
);
1714 /* Remove old name. */
1715 size_t size
= EXT4_XATTR_LEN(name_len
);
1717 last
= ENTRY((void *)last
- size
);
1718 memmove(here
, (void *)here
+ size
,
1719 (void *)last
- (void *)here
+ sizeof(__u32
));
1720 memset(last
, 0, size
);
1721 } else if (s
->not_found
) {
1722 /* Insert new name. */
1723 size_t size
= EXT4_XATTR_LEN(name_len
);
1724 size_t rest
= (void *)last
- (void *)here
+ sizeof(__u32
);
1726 memmove((void *)here
+ size
, here
, rest
);
1727 memset(here
, 0, size
);
1728 here
->e_name_index
= i
->name_index
;
1729 here
->e_name_len
= name_len
;
1730 memcpy(here
->e_name
, i
->name
, name_len
);
1732 /* This is an update, reset value info. */
1733 here
->e_value_inum
= 0;
1734 here
->e_value_offs
= 0;
1735 here
->e_value_size
= 0;
1739 /* Insert new value. */
1741 here
->e_value_inum
= cpu_to_le32(new_ea_inode
->i_ino
);
1742 } else if (i
->value_len
) {
1743 void *val
= s
->base
+ min_offs
- new_size
;
1745 here
->e_value_offs
= cpu_to_le16(min_offs
- new_size
);
1746 if (i
->value
== EXT4_ZERO_XATTR_VALUE
) {
1747 memset(val
, 0, new_size
);
1749 memcpy(val
, i
->value
, i
->value_len
);
1750 /* Clear padding bytes. */
1751 memset(val
+ i
->value_len
, 0,
1752 new_size
- i
->value_len
);
1755 here
->e_value_size
= cpu_to_le32(i
->value_len
);
1762 /* Entry hash calculation. */
1767 * Feed crc32c hash instead of the raw value for entry
1768 * hash calculation. This is to avoid walking
1769 * potentially long value buffer again.
1771 crc32c_hash
= cpu_to_le32(
1772 ext4_xattr_inode_get_hash(new_ea_inode
));
1773 hash
= ext4_xattr_hash_entry(here
->e_name
,
1776 } else if (is_block
) {
1777 __le32
*value
= s
->base
+ le16_to_cpu(
1778 here
->e_value_offs
);
1780 hash
= ext4_xattr_hash_entry(here
->e_name
,
1781 here
->e_name_len
, value
,
1784 here
->e_hash
= hash
;
1788 ext4_xattr_rehash((struct ext4_xattr_header
*)s
->base
);
1797 struct ext4_xattr_block_find
{
1798 struct ext4_xattr_search s
;
1799 struct buffer_head
*bh
;
1803 ext4_xattr_block_find(struct inode
*inode
, struct ext4_xattr_info
*i
,
1804 struct ext4_xattr_block_find
*bs
)
1806 struct super_block
*sb
= inode
->i_sb
;
1809 ea_idebug(inode
, "name=%d.%s, value=%p, value_len=%ld",
1810 i
->name_index
, i
->name
, i
->value
, (long)i
->value_len
);
1812 if (EXT4_I(inode
)->i_file_acl
) {
1813 /* The inode already has an extended attribute block. */
1814 bs
->bh
= sb_bread(sb
, EXT4_I(inode
)->i_file_acl
);
1818 ea_bdebug(bs
->bh
, "b_count=%d, refcount=%d",
1819 atomic_read(&(bs
->bh
->b_count
)),
1820 le32_to_cpu(BHDR(bs
->bh
)->h_refcount
));
1821 error
= ext4_xattr_check_block(inode
, bs
->bh
);
1824 /* Find the named attribute. */
1825 bs
->s
.base
= BHDR(bs
->bh
);
1826 bs
->s
.first
= BFIRST(bs
->bh
);
1827 bs
->s
.end
= bs
->bh
->b_data
+ bs
->bh
->b_size
;
1828 bs
->s
.here
= bs
->s
.first
;
1829 error
= xattr_find_entry(inode
, &bs
->s
.here
, bs
->s
.end
,
1830 i
->name_index
, i
->name
, 1);
1831 if (error
&& error
!= -ENODATA
)
1833 bs
->s
.not_found
= error
;
1842 ext4_xattr_block_set(handle_t
*handle
, struct inode
*inode
,
1843 struct ext4_xattr_info
*i
,
1844 struct ext4_xattr_block_find
*bs
)
1846 struct super_block
*sb
= inode
->i_sb
;
1847 struct buffer_head
*new_bh
= NULL
;
1848 struct ext4_xattr_search s_copy
= bs
->s
;
1849 struct ext4_xattr_search
*s
= &s_copy
;
1850 struct mb_cache_entry
*ce
= NULL
;
1852 struct mb_cache
*ea_block_cache
= EA_BLOCK_CACHE(inode
);
1853 struct inode
*ea_inode
= NULL
, *tmp_inode
;
1854 size_t old_ea_inode_quota
= 0;
1855 unsigned int ea_ino
;
1858 #define header(x) ((struct ext4_xattr_header *)(x))
1861 BUFFER_TRACE(bs
->bh
, "get_write_access");
1862 error
= ext4_journal_get_write_access(handle
, bs
->bh
);
1865 lock_buffer(bs
->bh
);
1867 if (header(s
->base
)->h_refcount
== cpu_to_le32(1)) {
1868 __u32 hash
= le32_to_cpu(BHDR(bs
->bh
)->h_hash
);
1871 * This must happen under buffer lock for
1872 * ext4_xattr_block_set() to reliably detect modified
1876 mb_cache_entry_delete(ea_block_cache
, hash
,
1878 ea_bdebug(bs
->bh
, "modifying in-place");
1879 error
= ext4_xattr_set_entry(i
, s
, handle
, inode
,
1880 true /* is_block */);
1881 ext4_xattr_block_csum_set(inode
, bs
->bh
);
1882 unlock_buffer(bs
->bh
);
1883 if (error
== -EFSCORRUPTED
)
1886 error
= ext4_handle_dirty_metadata(handle
,
1893 int offset
= (char *)s
->here
- bs
->bh
->b_data
;
1895 unlock_buffer(bs
->bh
);
1896 ea_bdebug(bs
->bh
, "cloning");
1897 s
->base
= kmalloc(bs
->bh
->b_size
, GFP_NOFS
);
1899 if (s
->base
== NULL
)
1901 memcpy(s
->base
, BHDR(bs
->bh
), bs
->bh
->b_size
);
1902 s
->first
= ENTRY(header(s
->base
)+1);
1903 header(s
->base
)->h_refcount
= cpu_to_le32(1);
1904 s
->here
= ENTRY(s
->base
+ offset
);
1905 s
->end
= s
->base
+ bs
->bh
->b_size
;
1908 * If existing entry points to an xattr inode, we need
1909 * to prevent ext4_xattr_set_entry() from decrementing
1910 * ref count on it because the reference belongs to the
1911 * original block. In this case, make the entry look
1912 * like it has an empty value.
1914 if (!s
->not_found
&& s
->here
->e_value_inum
) {
1915 ea_ino
= le32_to_cpu(s
->here
->e_value_inum
);
1916 error
= ext4_xattr_inode_iget(inode
, ea_ino
,
1917 le32_to_cpu(s
->here
->e_hash
),
1922 if (!ext4_test_inode_state(tmp_inode
,
1923 EXT4_STATE_LUSTRE_EA_INODE
)) {
1925 * Defer quota free call for previous
1926 * inode until success is guaranteed.
1928 old_ea_inode_quota
= le32_to_cpu(
1929 s
->here
->e_value_size
);
1933 s
->here
->e_value_inum
= 0;
1934 s
->here
->e_value_size
= 0;
1938 /* Allocate a buffer where we construct the new block. */
1939 s
->base
= kzalloc(sb
->s_blocksize
, GFP_NOFS
);
1940 /* assert(header == s->base) */
1942 if (s
->base
== NULL
)
1944 header(s
->base
)->h_magic
= cpu_to_le32(EXT4_XATTR_MAGIC
);
1945 header(s
->base
)->h_blocks
= cpu_to_le32(1);
1946 header(s
->base
)->h_refcount
= cpu_to_le32(1);
1947 s
->first
= ENTRY(header(s
->base
)+1);
1948 s
->here
= ENTRY(header(s
->base
)+1);
1949 s
->end
= s
->base
+ sb
->s_blocksize
;
1952 error
= ext4_xattr_set_entry(i
, s
, handle
, inode
, true /* is_block */);
1953 if (error
== -EFSCORRUPTED
)
1958 if (i
->value
&& s
->here
->e_value_inum
) {
1960 * A ref count on ea_inode has been taken as part of the call to
1961 * ext4_xattr_set_entry() above. We would like to drop this
1962 * extra ref but we have to wait until the xattr block is
1963 * initialized and has its own ref count on the ea_inode.
1965 ea_ino
= le32_to_cpu(s
->here
->e_value_inum
);
1966 error
= ext4_xattr_inode_iget(inode
, ea_ino
,
1967 le32_to_cpu(s
->here
->e_hash
),
1976 if (!IS_LAST_ENTRY(s
->first
)) {
1977 new_bh
= ext4_xattr_block_cache_find(inode
, header(s
->base
),
1980 /* We found an identical block in the cache. */
1981 if (new_bh
== bs
->bh
)
1982 ea_bdebug(new_bh
, "keeping");
1986 WARN_ON_ONCE(dquot_initialize_needed(inode
));
1988 /* The old block is released after updating
1990 error
= dquot_alloc_block(inode
,
1991 EXT4_C2B(EXT4_SB(sb
), 1));
1994 BUFFER_TRACE(new_bh
, "get_write_access");
1995 error
= ext4_journal_get_write_access(handle
,
1999 lock_buffer(new_bh
);
2001 * We have to be careful about races with
2002 * freeing, rehashing or adding references to
2003 * xattr block. Once we hold buffer lock xattr
2004 * block's state is stable so we can check
2005 * whether the block got freed / rehashed or
2006 * not. Since we unhash mbcache entry under
2007 * buffer lock when freeing / rehashing xattr
2008 * block, checking whether entry is still
2009 * hashed is reliable. Same rules hold for
2010 * e_reusable handling.
2012 if (hlist_bl_unhashed(&ce
->e_hash_list
) ||
2015 * Undo everything and check mbcache
2018 unlock_buffer(new_bh
);
2019 dquot_free_block(inode
,
2020 EXT4_C2B(EXT4_SB(sb
),
2023 mb_cache_entry_put(ea_block_cache
, ce
);
2028 ref
= le32_to_cpu(BHDR(new_bh
)->h_refcount
) + 1;
2029 BHDR(new_bh
)->h_refcount
= cpu_to_le32(ref
);
2030 if (ref
>= EXT4_XATTR_REFCOUNT_MAX
)
2032 ea_bdebug(new_bh
, "reusing; refcount now=%d",
2034 ext4_xattr_block_csum_set(inode
, new_bh
);
2035 unlock_buffer(new_bh
);
2036 error
= ext4_handle_dirty_metadata(handle
,
2042 mb_cache_entry_touch(ea_block_cache
, ce
);
2043 mb_cache_entry_put(ea_block_cache
, ce
);
2045 } else if (bs
->bh
&& s
->base
== bs
->bh
->b_data
) {
2046 /* We were modifying this block in-place. */
2047 ea_bdebug(bs
->bh
, "keeping this block");
2048 ext4_xattr_block_cache_insert(ea_block_cache
, bs
->bh
);
2052 /* We need to allocate a new block */
2053 ext4_fsblk_t goal
, block
;
2055 WARN_ON_ONCE(dquot_initialize_needed(inode
));
2057 goal
= ext4_group_first_block_no(sb
,
2058 EXT4_I(inode
)->i_block_group
);
2060 /* non-extent files can't have physical blocks past 2^32 */
2061 if (!(ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)))
2062 goal
= goal
& EXT4_MAX_BLOCK_FILE_PHYS
;
2064 block
= ext4_new_meta_blocks(handle
, inode
, goal
, 0,
2069 if (!(ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)))
2070 BUG_ON(block
> EXT4_MAX_BLOCK_FILE_PHYS
);
2072 ea_idebug(inode
, "creating block %llu",
2073 (unsigned long long)block
);
2075 new_bh
= sb_getblk(sb
, block
);
2076 if (unlikely(!new_bh
)) {
2079 ext4_free_blocks(handle
, inode
, NULL
, block
, 1,
2080 EXT4_FREE_BLOCKS_METADATA
);
2083 error
= ext4_xattr_inode_inc_ref_all(handle
, inode
,
2084 ENTRY(header(s
->base
)+1));
2088 /* Drop the extra ref on ea_inode. */
2089 error
= ext4_xattr_inode_dec_ref(handle
,
2092 ext4_warning_inode(ea_inode
,
2099 lock_buffer(new_bh
);
2100 error
= ext4_journal_get_create_access(handle
, new_bh
);
2102 unlock_buffer(new_bh
);
2106 memcpy(new_bh
->b_data
, s
->base
, new_bh
->b_size
);
2107 ext4_xattr_block_csum_set(inode
, new_bh
);
2108 set_buffer_uptodate(new_bh
);
2109 unlock_buffer(new_bh
);
2110 ext4_xattr_block_cache_insert(ea_block_cache
, new_bh
);
2111 error
= ext4_handle_dirty_metadata(handle
, inode
,
2118 if (old_ea_inode_quota
)
2119 ext4_xattr_inode_free_quota(inode
, NULL
, old_ea_inode_quota
);
2121 /* Update the inode. */
2122 EXT4_I(inode
)->i_file_acl
= new_bh
? new_bh
->b_blocknr
: 0;
2124 /* Drop the previous xattr block. */
2125 if (bs
->bh
&& bs
->bh
!= new_bh
) {
2126 struct ext4_xattr_inode_array
*ea_inode_array
= NULL
;
2128 ext4_xattr_release_block(handle
, inode
, bs
->bh
,
2130 0 /* extra_credits */);
2131 ext4_xattr_inode_array_free(ea_inode_array
);
2139 error2
= ext4_xattr_inode_dec_ref(handle
, ea_inode
);
2141 ext4_warning_inode(ea_inode
, "dec ref error=%d",
2144 /* If there was an error, revert the quota charge. */
2146 ext4_xattr_inode_free_quota(inode
, ea_inode
,
2147 i_size_read(ea_inode
));
2151 mb_cache_entry_put(ea_block_cache
, ce
);
2153 if (!(bs
->bh
&& s
->base
== bs
->bh
->b_data
))
2159 dquot_free_block(inode
, EXT4_C2B(EXT4_SB(sb
), 1));
2163 EXT4_ERROR_INODE(inode
, "bad block %llu",
2164 EXT4_I(inode
)->i_file_acl
);
2170 int ext4_xattr_ibody_find(struct inode
*inode
, struct ext4_xattr_info
*i
,
2171 struct ext4_xattr_ibody_find
*is
)
2173 struct ext4_xattr_ibody_header
*header
;
2174 struct ext4_inode
*raw_inode
;
2177 if (EXT4_I(inode
)->i_extra_isize
== 0)
2179 raw_inode
= ext4_raw_inode(&is
->iloc
);
2180 header
= IHDR(inode
, raw_inode
);
2181 is
->s
.base
= is
->s
.first
= IFIRST(header
);
2182 is
->s
.here
= is
->s
.first
;
2183 is
->s
.end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
2184 if (ext4_test_inode_state(inode
, EXT4_STATE_XATTR
)) {
2185 error
= xattr_check_inode(inode
, header
, is
->s
.end
);
2188 /* Find the named attribute. */
2189 error
= xattr_find_entry(inode
, &is
->s
.here
, is
->s
.end
,
2190 i
->name_index
, i
->name
, 0);
2191 if (error
&& error
!= -ENODATA
)
2193 is
->s
.not_found
= error
;
2198 int ext4_xattr_ibody_inline_set(handle_t
*handle
, struct inode
*inode
,
2199 struct ext4_xattr_info
*i
,
2200 struct ext4_xattr_ibody_find
*is
)
2202 struct ext4_xattr_ibody_header
*header
;
2203 struct ext4_xattr_search
*s
= &is
->s
;
2206 if (EXT4_I(inode
)->i_extra_isize
== 0)
2208 error
= ext4_xattr_set_entry(i
, s
, handle
, inode
, false /* is_block */);
2210 if (error
== -ENOSPC
&&
2211 ext4_has_inline_data(inode
)) {
2212 error
= ext4_try_to_evict_inline_data(handle
, inode
,
2213 EXT4_XATTR_LEN(strlen(i
->name
) +
2214 EXT4_XATTR_SIZE(i
->value_len
)));
2217 error
= ext4_xattr_ibody_find(inode
, i
, is
);
2220 error
= ext4_xattr_set_entry(i
, s
, handle
, inode
,
2221 false /* is_block */);
2226 header
= IHDR(inode
, ext4_raw_inode(&is
->iloc
));
2227 if (!IS_LAST_ENTRY(s
->first
)) {
2228 header
->h_magic
= cpu_to_le32(EXT4_XATTR_MAGIC
);
2229 ext4_set_inode_state(inode
, EXT4_STATE_XATTR
);
2231 header
->h_magic
= cpu_to_le32(0);
2232 ext4_clear_inode_state(inode
, EXT4_STATE_XATTR
);
2237 static int ext4_xattr_ibody_set(handle_t
*handle
, struct inode
*inode
,
2238 struct ext4_xattr_info
*i
,
2239 struct ext4_xattr_ibody_find
*is
)
2241 struct ext4_xattr_ibody_header
*header
;
2242 struct ext4_xattr_search
*s
= &is
->s
;
2245 if (EXT4_I(inode
)->i_extra_isize
== 0)
2247 error
= ext4_xattr_set_entry(i
, s
, handle
, inode
, false /* is_block */);
2250 header
= IHDR(inode
, ext4_raw_inode(&is
->iloc
));
2251 if (!IS_LAST_ENTRY(s
->first
)) {
2252 header
->h_magic
= cpu_to_le32(EXT4_XATTR_MAGIC
);
2253 ext4_set_inode_state(inode
, EXT4_STATE_XATTR
);
2255 header
->h_magic
= cpu_to_le32(0);
2256 ext4_clear_inode_state(inode
, EXT4_STATE_XATTR
);
2261 static int ext4_xattr_value_same(struct ext4_xattr_search
*s
,
2262 struct ext4_xattr_info
*i
)
2266 /* When e_value_inum is set the value is stored externally. */
2267 if (s
->here
->e_value_inum
)
2269 if (le32_to_cpu(s
->here
->e_value_size
) != i
->value_len
)
2271 value
= ((void *)s
->base
) + le16_to_cpu(s
->here
->e_value_offs
);
2272 return !memcmp(value
, i
->value
, i
->value_len
);
2275 static struct buffer_head
*ext4_xattr_get_block(struct inode
*inode
)
2277 struct buffer_head
*bh
;
2280 if (!EXT4_I(inode
)->i_file_acl
)
2282 bh
= sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
);
2284 return ERR_PTR(-EIO
);
2285 error
= ext4_xattr_check_block(inode
, bh
);
2287 return ERR_PTR(error
);
2292 * ext4_xattr_set_handle()
2294 * Create, replace or remove an extended attribute for this inode. Value
2295 * is NULL to remove an existing extended attribute, and non-NULL to
2296 * either replace an existing extended attribute, or create a new extended
2297 * attribute. The flags XATTR_REPLACE and XATTR_CREATE
2298 * specify that an extended attribute must exist and must not exist
2299 * previous to the call, respectively.
2301 * Returns 0, or a negative error number on failure.
2304 ext4_xattr_set_handle(handle_t
*handle
, struct inode
*inode
, int name_index
,
2305 const char *name
, const void *value
, size_t value_len
,
2308 struct ext4_xattr_info i
= {
2309 .name_index
= name_index
,
2312 .value_len
= value_len
,
2315 struct ext4_xattr_ibody_find is
= {
2316 .s
= { .not_found
= -ENODATA
, },
2318 struct ext4_xattr_block_find bs
= {
2319 .s
= { .not_found
= -ENODATA
, },
2326 if (strlen(name
) > 255)
2329 ext4_write_lock_xattr(inode
, &no_expand
);
2331 /* Check journal credits under write lock. */
2332 if (ext4_handle_valid(handle
)) {
2333 struct buffer_head
*bh
;
2336 bh
= ext4_xattr_get_block(inode
);
2338 error
= PTR_ERR(bh
);
2342 credits
= __ext4_xattr_set_credits(inode
->i_sb
, inode
, bh
,
2344 flags
& XATTR_CREATE
);
2347 if (!ext4_handle_has_enough_credits(handle
, credits
)) {
2353 error
= ext4_reserve_inode_write(handle
, inode
, &is
.iloc
);
2357 if (ext4_test_inode_state(inode
, EXT4_STATE_NEW
)) {
2358 struct ext4_inode
*raw_inode
= ext4_raw_inode(&is
.iloc
);
2359 memset(raw_inode
, 0, EXT4_SB(inode
->i_sb
)->s_inode_size
);
2360 ext4_clear_inode_state(inode
, EXT4_STATE_NEW
);
2363 error
= ext4_xattr_ibody_find(inode
, &i
, &is
);
2367 error
= ext4_xattr_block_find(inode
, &i
, &bs
);
2370 if (is
.s
.not_found
&& bs
.s
.not_found
) {
2372 if (flags
& XATTR_REPLACE
)
2379 if (flags
& XATTR_CREATE
)
2384 if (!is
.s
.not_found
)
2385 error
= ext4_xattr_ibody_set(handle
, inode
, &i
, &is
);
2386 else if (!bs
.s
.not_found
)
2387 error
= ext4_xattr_block_set(handle
, inode
, &i
, &bs
);
2390 /* Xattr value did not change? Save us some work and bail out */
2391 if (!is
.s
.not_found
&& ext4_xattr_value_same(&is
.s
, &i
))
2393 if (!bs
.s
.not_found
&& ext4_xattr_value_same(&bs
.s
, &i
))
2396 if (ext4_has_feature_ea_inode(inode
->i_sb
) &&
2397 (EXT4_XATTR_SIZE(i
.value_len
) >
2398 EXT4_XATTR_MIN_LARGE_EA_SIZE(inode
->i_sb
->s_blocksize
)))
2401 error
= ext4_xattr_ibody_set(handle
, inode
, &i
, &is
);
2402 if (!error
&& !bs
.s
.not_found
) {
2404 error
= ext4_xattr_block_set(handle
, inode
, &i
, &bs
);
2405 } else if (error
== -ENOSPC
) {
2406 if (EXT4_I(inode
)->i_file_acl
&& !bs
.s
.base
) {
2407 error
= ext4_xattr_block_find(inode
, &i
, &bs
);
2411 error
= ext4_xattr_block_set(handle
, inode
, &i
, &bs
);
2412 if (!error
&& !is
.s
.not_found
) {
2414 error
= ext4_xattr_ibody_set(handle
, inode
, &i
,
2416 } else if (error
== -ENOSPC
) {
2418 * Xattr does not fit in the block, store at
2419 * external inode if possible.
2421 if (ext4_has_feature_ea_inode(inode
->i_sb
) &&
2430 ext4_xattr_update_super_block(handle
, inode
->i_sb
);
2431 inode
->i_ctime
= current_time(inode
);
2434 error
= ext4_mark_iloc_dirty(handle
, inode
, &is
.iloc
);
2436 * The bh is consumed by ext4_mark_iloc_dirty, even with
2441 ext4_handle_sync(handle
);
2447 ext4_write_unlock_xattr(inode
, &no_expand
);
2451 int ext4_xattr_set_credits(struct inode
*inode
, size_t value_len
,
2452 bool is_create
, int *credits
)
2454 struct buffer_head
*bh
;
2459 if (!EXT4_SB(inode
->i_sb
)->s_journal
)
2462 down_read(&EXT4_I(inode
)->xattr_sem
);
2464 bh
= ext4_xattr_get_block(inode
);
2468 *credits
= __ext4_xattr_set_credits(inode
->i_sb
, inode
, bh
,
2469 value_len
, is_create
);
2474 up_read(&EXT4_I(inode
)->xattr_sem
);
2481 * Like ext4_xattr_set_handle, but start from an inode. This extended
2482 * attribute modification is a filesystem transaction by itself.
2484 * Returns 0, or a negative error number on failure.
2487 ext4_xattr_set(struct inode
*inode
, int name_index
, const char *name
,
2488 const void *value
, size_t value_len
, int flags
)
2491 struct super_block
*sb
= inode
->i_sb
;
2492 int error
, retries
= 0;
2495 error
= dquot_initialize(inode
);
2500 error
= ext4_xattr_set_credits(inode
, value_len
, flags
& XATTR_CREATE
,
2505 handle
= ext4_journal_start(inode
, EXT4_HT_XATTR
, credits
);
2506 if (IS_ERR(handle
)) {
2507 error
= PTR_ERR(handle
);
2511 error
= ext4_xattr_set_handle(handle
, inode
, name_index
, name
,
2512 value
, value_len
, flags
);
2513 error2
= ext4_journal_stop(handle
);
2514 if (error
== -ENOSPC
&&
2515 ext4_should_retry_alloc(sb
, &retries
))
2525 * Shift the EA entries in the inode to create space for the increased
2528 static void ext4_xattr_shift_entries(struct ext4_xattr_entry
*entry
,
2529 int value_offs_shift
, void *to
,
2530 void *from
, size_t n
)
2532 struct ext4_xattr_entry
*last
= entry
;
2535 /* We always shift xattr headers further thus offsets get lower */
2536 BUG_ON(value_offs_shift
> 0);
2538 /* Adjust the value offsets of the entries */
2539 for (; !IS_LAST_ENTRY(last
); last
= EXT4_XATTR_NEXT(last
)) {
2540 if (!last
->e_value_inum
&& last
->e_value_size
) {
2541 new_offs
= le16_to_cpu(last
->e_value_offs
) +
2543 last
->e_value_offs
= cpu_to_le16(new_offs
);
2546 /* Shift the entries by n bytes */
2547 memmove(to
, from
, n
);
2551 * Move xattr pointed to by 'entry' from inode into external xattr block
2553 static int ext4_xattr_move_to_block(handle_t
*handle
, struct inode
*inode
,
2554 struct ext4_inode
*raw_inode
,
2555 struct ext4_xattr_entry
*entry
)
2557 struct ext4_xattr_ibody_find
*is
= NULL
;
2558 struct ext4_xattr_block_find
*bs
= NULL
;
2559 char *buffer
= NULL
, *b_entry_name
= NULL
;
2560 size_t value_size
= le32_to_cpu(entry
->e_value_size
);
2561 struct ext4_xattr_info i
= {
2564 .name_index
= entry
->e_name_index
,
2565 .in_inode
= !!entry
->e_value_inum
,
2567 struct ext4_xattr_ibody_header
*header
= IHDR(inode
, raw_inode
);
2570 is
= kzalloc(sizeof(struct ext4_xattr_ibody_find
), GFP_NOFS
);
2571 bs
= kzalloc(sizeof(struct ext4_xattr_block_find
), GFP_NOFS
);
2572 buffer
= kmalloc(value_size
, GFP_NOFS
);
2573 b_entry_name
= kmalloc(entry
->e_name_len
+ 1, GFP_NOFS
);
2574 if (!is
|| !bs
|| !buffer
|| !b_entry_name
) {
2579 is
->s
.not_found
= -ENODATA
;
2580 bs
->s
.not_found
= -ENODATA
;
2584 /* Save the entry name and the entry value */
2585 if (entry
->e_value_inum
) {
2586 error
= ext4_xattr_inode_get(inode
, entry
, buffer
, value_size
);
2590 size_t value_offs
= le16_to_cpu(entry
->e_value_offs
);
2591 memcpy(buffer
, (void *)IFIRST(header
) + value_offs
, value_size
);
2594 memcpy(b_entry_name
, entry
->e_name
, entry
->e_name_len
);
2595 b_entry_name
[entry
->e_name_len
] = '\0';
2596 i
.name
= b_entry_name
;
2598 error
= ext4_get_inode_loc(inode
, &is
->iloc
);
2602 error
= ext4_xattr_ibody_find(inode
, &i
, is
);
2606 /* Remove the chosen entry from the inode */
2607 error
= ext4_xattr_ibody_set(handle
, inode
, &i
, is
);
2612 i
.value_len
= value_size
;
2613 error
= ext4_xattr_block_find(inode
, &i
, bs
);
2617 /* Add entry which was removed from the inode into the block */
2618 error
= ext4_xattr_block_set(handle
, inode
, &i
, bs
);
2623 kfree(b_entry_name
);
2626 brelse(is
->iloc
.bh
);
2633 static int ext4_xattr_make_inode_space(handle_t
*handle
, struct inode
*inode
,
2634 struct ext4_inode
*raw_inode
,
2635 int isize_diff
, size_t ifree
,
2636 size_t bfree
, int *total_ino
)
2638 struct ext4_xattr_ibody_header
*header
= IHDR(inode
, raw_inode
);
2639 struct ext4_xattr_entry
*small_entry
;
2640 struct ext4_xattr_entry
*entry
;
2641 struct ext4_xattr_entry
*last
;
2642 unsigned int entry_size
; /* EA entry size */
2643 unsigned int total_size
; /* EA entry size + value size */
2644 unsigned int min_total_size
;
2647 while (isize_diff
> ifree
) {
2650 min_total_size
= ~0U;
2651 last
= IFIRST(header
);
2652 /* Find the entry best suited to be pushed into EA block */
2653 for (; !IS_LAST_ENTRY(last
); last
= EXT4_XATTR_NEXT(last
)) {
2654 total_size
= EXT4_XATTR_LEN(last
->e_name_len
);
2655 if (!last
->e_value_inum
)
2656 total_size
+= EXT4_XATTR_SIZE(
2657 le32_to_cpu(last
->e_value_size
));
2658 if (total_size
<= bfree
&&
2659 total_size
< min_total_size
) {
2660 if (total_size
+ ifree
< isize_diff
) {
2664 min_total_size
= total_size
;
2669 if (entry
== NULL
) {
2670 if (small_entry
== NULL
)
2672 entry
= small_entry
;
2675 entry_size
= EXT4_XATTR_LEN(entry
->e_name_len
);
2676 total_size
= entry_size
;
2677 if (!entry
->e_value_inum
)
2678 total_size
+= EXT4_XATTR_SIZE(
2679 le32_to_cpu(entry
->e_value_size
));
2680 error
= ext4_xattr_move_to_block(handle
, inode
, raw_inode
,
2685 *total_ino
-= entry_size
;
2686 ifree
+= total_size
;
2687 bfree
-= total_size
;
2694 * Expand an inode by new_extra_isize bytes when EAs are present.
2695 * Returns 0 on success or negative error number on failure.
2697 int ext4_expand_extra_isize_ea(struct inode
*inode
, int new_extra_isize
,
2698 struct ext4_inode
*raw_inode
, handle_t
*handle
)
2700 struct ext4_xattr_ibody_header
*header
;
2701 struct buffer_head
*bh
;
2702 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
2703 static unsigned int mnt_count
;
2705 size_t ifree
, bfree
;
2708 int error
= 0, tried_min_extra_isize
= 0;
2709 int s_min_extra_isize
= le16_to_cpu(sbi
->s_es
->s_min_extra_isize
);
2710 int isize_diff
; /* How much do we need to grow i_extra_isize */
2713 isize_diff
= new_extra_isize
- EXT4_I(inode
)->i_extra_isize
;
2714 if (EXT4_I(inode
)->i_extra_isize
>= new_extra_isize
)
2717 header
= IHDR(inode
, raw_inode
);
2720 * Check if enough free space is available in the inode to shift the
2721 * entries ahead by new_extra_isize.
2724 base
= IFIRST(header
);
2725 end
= (void *)raw_inode
+ EXT4_SB(inode
->i_sb
)->s_inode_size
;
2726 min_offs
= end
- base
;
2727 total_ino
= sizeof(struct ext4_xattr_ibody_header
);
2729 error
= xattr_check_inode(inode
, header
, end
);
2733 ifree
= ext4_xattr_free_space(base
, &min_offs
, base
, &total_ino
);
2734 if (ifree
>= isize_diff
)
2738 * Enough free space isn't available in the inode, check if
2739 * EA block can hold new_extra_isize bytes.
2741 if (EXT4_I(inode
)->i_file_acl
) {
2742 bh
= sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
);
2746 error
= ext4_xattr_check_block(inode
, bh
);
2750 end
= bh
->b_data
+ bh
->b_size
;
2751 min_offs
= end
- base
;
2752 bfree
= ext4_xattr_free_space(BFIRST(bh
), &min_offs
, base
,
2755 if (bfree
+ ifree
< isize_diff
) {
2756 if (!tried_min_extra_isize
&& s_min_extra_isize
) {
2757 tried_min_extra_isize
++;
2758 new_extra_isize
= s_min_extra_isize
;
2765 bfree
= inode
->i_sb
->s_blocksize
;
2768 error
= ext4_xattr_make_inode_space(handle
, inode
, raw_inode
,
2769 isize_diff
, ifree
, bfree
,
2772 if (error
== -ENOSPC
&& !tried_min_extra_isize
&&
2773 s_min_extra_isize
) {
2774 tried_min_extra_isize
++;
2775 new_extra_isize
= s_min_extra_isize
;
2781 /* Adjust the offsets and shift the remaining entries ahead */
2782 ext4_xattr_shift_entries(IFIRST(header
), EXT4_I(inode
)->i_extra_isize
2783 - new_extra_isize
, (void *)raw_inode
+
2784 EXT4_GOOD_OLD_INODE_SIZE
+ new_extra_isize
,
2785 (void *)header
, total_ino
);
2786 EXT4_I(inode
)->i_extra_isize
= new_extra_isize
;
2789 if (error
&& (mnt_count
!= le16_to_cpu(sbi
->s_es
->s_mnt_count
))) {
2790 ext4_warning(inode
->i_sb
, "Unable to expand inode %lu. Delete some EAs or run e2fsck.",
2792 mnt_count
= le16_to_cpu(sbi
->s_es
->s_mnt_count
);
2797 #define EIA_INCR 16 /* must be 2^n */
2798 #define EIA_MASK (EIA_INCR - 1)
2800 /* Add the large xattr @inode into @ea_inode_array for deferred iput().
2801 * If @ea_inode_array is new or full it will be grown and the old
2802 * contents copied over.
2805 ext4_expand_inode_array(struct ext4_xattr_inode_array
**ea_inode_array
,
2806 struct inode
*inode
)
2808 if (*ea_inode_array
== NULL
) {
2810 * Start with 15 inodes, so it fits into a power-of-two size.
2811 * If *ea_inode_array is NULL, this is essentially offsetof()
2814 kmalloc(offsetof(struct ext4_xattr_inode_array
,
2817 if (*ea_inode_array
== NULL
)
2819 (*ea_inode_array
)->count
= 0;
2820 } else if (((*ea_inode_array
)->count
& EIA_MASK
) == EIA_MASK
) {
2821 /* expand the array once all 15 + n * 16 slots are full */
2822 struct ext4_xattr_inode_array
*new_array
= NULL
;
2823 int count
= (*ea_inode_array
)->count
;
2825 /* if new_array is NULL, this is essentially offsetof() */
2826 new_array
= kmalloc(
2827 offsetof(struct ext4_xattr_inode_array
,
2828 inodes
[count
+ EIA_INCR
]),
2830 if (new_array
== NULL
)
2832 memcpy(new_array
, *ea_inode_array
,
2833 offsetof(struct ext4_xattr_inode_array
, inodes
[count
]));
2834 kfree(*ea_inode_array
);
2835 *ea_inode_array
= new_array
;
2837 (*ea_inode_array
)->inodes
[(*ea_inode_array
)->count
++] = inode
;
2842 * ext4_xattr_delete_inode()
2844 * Free extended attribute resources associated with this inode. Traverse
2845 * all entries and decrement reference on any xattr inodes associated with this
2846 * inode. This is called immediately before an inode is freed. We have exclusive
2847 * access to the inode. If an orphan inode is deleted it will also release its
2848 * references on xattr block and xattr inodes.
2850 int ext4_xattr_delete_inode(handle_t
*handle
, struct inode
*inode
,
2851 struct ext4_xattr_inode_array
**ea_inode_array
,
2854 struct buffer_head
*bh
= NULL
;
2855 struct ext4_xattr_ibody_header
*header
;
2856 struct ext4_iloc iloc
= { .bh
= NULL
};
2857 struct ext4_xattr_entry
*entry
;
2858 struct inode
*ea_inode
;
2861 error
= ext4_xattr_ensure_credits(handle
, inode
, extra_credits
,
2864 false /* block_csum */);
2866 EXT4_ERROR_INODE(inode
, "ensure credits (error %d)", error
);
2870 if (ext4_has_feature_ea_inode(inode
->i_sb
) &&
2871 ext4_test_inode_state(inode
, EXT4_STATE_XATTR
)) {
2873 error
= ext4_get_inode_loc(inode
, &iloc
);
2875 EXT4_ERROR_INODE(inode
, "inode loc (error %d)", error
);
2879 error
= ext4_journal_get_write_access(handle
, iloc
.bh
);
2881 EXT4_ERROR_INODE(inode
, "write access (error %d)",
2886 header
= IHDR(inode
, ext4_raw_inode(&iloc
));
2887 if (header
->h_magic
== cpu_to_le32(EXT4_XATTR_MAGIC
))
2888 ext4_xattr_inode_dec_ref_all(handle
, inode
, iloc
.bh
,
2890 false /* block_csum */,
2893 false /* skip_quota */);
2896 if (EXT4_I(inode
)->i_file_acl
) {
2897 bh
= sb_bread(inode
->i_sb
, EXT4_I(inode
)->i_file_acl
);
2899 EXT4_ERROR_INODE(inode
, "block %llu read error",
2900 EXT4_I(inode
)->i_file_acl
);
2904 error
= ext4_xattr_check_block(inode
, bh
);
2908 if (ext4_has_feature_ea_inode(inode
->i_sb
)) {
2909 for (entry
= BFIRST(bh
); !IS_LAST_ENTRY(entry
);
2910 entry
= EXT4_XATTR_NEXT(entry
)) {
2911 if (!entry
->e_value_inum
)
2913 error
= ext4_xattr_inode_iget(inode
,
2914 le32_to_cpu(entry
->e_value_inum
),
2915 le32_to_cpu(entry
->e_hash
),
2919 ext4_xattr_inode_free_quota(inode
, ea_inode
,
2920 le32_to_cpu(entry
->e_value_size
));
2926 ext4_xattr_release_block(handle
, inode
, bh
, ea_inode_array
,
2929 * Update i_file_acl value in the same transaction that releases
2932 EXT4_I(inode
)->i_file_acl
= 0;
2933 error
= ext4_mark_inode_dirty(handle
, inode
);
2935 EXT4_ERROR_INODE(inode
, "mark inode dirty (error %d)",
2947 void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array
*ea_inode_array
)
2951 if (ea_inode_array
== NULL
)
2954 for (idx
= 0; idx
< ea_inode_array
->count
; ++idx
)
2955 iput(ea_inode_array
->inodes
[idx
]);
2956 kfree(ea_inode_array
);
2960 * ext4_xattr_block_cache_insert()
2962 * Create a new entry in the extended attribute block cache, and insert
2963 * it unless such an entry is already in the cache.
2965 * Returns 0, or a negative error number on failure.
2968 ext4_xattr_block_cache_insert(struct mb_cache
*ea_block_cache
,
2969 struct buffer_head
*bh
)
2971 struct ext4_xattr_header
*header
= BHDR(bh
);
2972 __u32 hash
= le32_to_cpu(header
->h_hash
);
2973 int reusable
= le32_to_cpu(header
->h_refcount
) <
2974 EXT4_XATTR_REFCOUNT_MAX
;
2977 if (!ea_block_cache
)
2979 error
= mb_cache_entry_create(ea_block_cache
, GFP_NOFS
, hash
,
2980 bh
->b_blocknr
, reusable
);
2982 if (error
== -EBUSY
)
2983 ea_bdebug(bh
, "already in cache");
2985 ea_bdebug(bh
, "inserting [%x]", (int)hash
);
2991 * Compare two extended attribute blocks for equality.
2993 * Returns 0 if the blocks are equal, 1 if they differ, and
2994 * a negative error number on errors.
2997 ext4_xattr_cmp(struct ext4_xattr_header
*header1
,
2998 struct ext4_xattr_header
*header2
)
3000 struct ext4_xattr_entry
*entry1
, *entry2
;
3002 entry1
= ENTRY(header1
+1);
3003 entry2
= ENTRY(header2
+1);
3004 while (!IS_LAST_ENTRY(entry1
)) {
3005 if (IS_LAST_ENTRY(entry2
))
3007 if (entry1
->e_hash
!= entry2
->e_hash
||
3008 entry1
->e_name_index
!= entry2
->e_name_index
||
3009 entry1
->e_name_len
!= entry2
->e_name_len
||
3010 entry1
->e_value_size
!= entry2
->e_value_size
||
3011 entry1
->e_value_inum
!= entry2
->e_value_inum
||
3012 memcmp(entry1
->e_name
, entry2
->e_name
, entry1
->e_name_len
))
3014 if (!entry1
->e_value_inum
&&
3015 memcmp((char *)header1
+ le16_to_cpu(entry1
->e_value_offs
),
3016 (char *)header2
+ le16_to_cpu(entry2
->e_value_offs
),
3017 le32_to_cpu(entry1
->e_value_size
)))
3020 entry1
= EXT4_XATTR_NEXT(entry1
);
3021 entry2
= EXT4_XATTR_NEXT(entry2
);
3023 if (!IS_LAST_ENTRY(entry2
))
3029 * ext4_xattr_block_cache_find()
3031 * Find an identical extended attribute block.
3033 * Returns a pointer to the block found, or NULL if such a block was
3034 * not found or an error occurred.
3036 static struct buffer_head
*
3037 ext4_xattr_block_cache_find(struct inode
*inode
,
3038 struct ext4_xattr_header
*header
,
3039 struct mb_cache_entry
**pce
)
3041 __u32 hash
= le32_to_cpu(header
->h_hash
);
3042 struct mb_cache_entry
*ce
;
3043 struct mb_cache
*ea_block_cache
= EA_BLOCK_CACHE(inode
);
3045 if (!ea_block_cache
)
3047 if (!header
->h_hash
)
3048 return NULL
; /* never share */
3049 ea_idebug(inode
, "looking for cached blocks [%x]", (int)hash
);
3050 ce
= mb_cache_entry_find_first(ea_block_cache
, hash
);
3052 struct buffer_head
*bh
;
3054 bh
= sb_bread(inode
->i_sb
, ce
->e_value
);
3056 EXT4_ERROR_INODE(inode
, "block %lu read error",
3057 (unsigned long)ce
->e_value
);
3058 } else if (ext4_xattr_cmp(header
, BHDR(bh
)) == 0) {
3063 ce
= mb_cache_entry_find_next(ea_block_cache
, ce
);
3068 #define NAME_HASH_SHIFT 5
3069 #define VALUE_HASH_SHIFT 16
3072 * ext4_xattr_hash_entry()
3074 * Compute the hash of an extended attribute.
3076 static __le32
ext4_xattr_hash_entry(char *name
, size_t name_len
, __le32
*value
,
3081 while (name_len
--) {
3082 hash
= (hash
<< NAME_HASH_SHIFT
) ^
3083 (hash
>> (8*sizeof(hash
) - NAME_HASH_SHIFT
)) ^
3086 while (value_count
--) {
3087 hash
= (hash
<< VALUE_HASH_SHIFT
) ^
3088 (hash
>> (8*sizeof(hash
) - VALUE_HASH_SHIFT
)) ^
3089 le32_to_cpu(*value
++);
3091 return cpu_to_le32(hash
);
3094 #undef NAME_HASH_SHIFT
3095 #undef VALUE_HASH_SHIFT
3097 #define BLOCK_HASH_SHIFT 16
3100 * ext4_xattr_rehash()
3102 * Re-compute the extended attribute hash value after an entry has changed.
3104 static void ext4_xattr_rehash(struct ext4_xattr_header
*header
)
3106 struct ext4_xattr_entry
*here
;
3109 here
= ENTRY(header
+1);
3110 while (!IS_LAST_ENTRY(here
)) {
3111 if (!here
->e_hash
) {
3112 /* Block is not shared if an entry's hash value == 0 */
3116 hash
= (hash
<< BLOCK_HASH_SHIFT
) ^
3117 (hash
>> (8*sizeof(hash
) - BLOCK_HASH_SHIFT
)) ^
3118 le32_to_cpu(here
->e_hash
);
3119 here
= EXT4_XATTR_NEXT(here
);
3121 header
->h_hash
= cpu_to_le32(hash
);
3124 #undef BLOCK_HASH_SHIFT
3126 #define HASH_BUCKET_BITS 10
3129 ext4_xattr_create_cache(void)
3131 return mb_cache_create(HASH_BUCKET_BITS
);
3134 void ext4_xattr_destroy_cache(struct mb_cache
*cache
)
3137 mb_cache_destroy(cache
);