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Commit | Line | Data |
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ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/xattr.c |
ac27a0ec DK |
3 | * |
4 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> | |
5 | * | |
6 | * Fix by Harrison Xing <harrison@mountainviewdata.com>. | |
617ba13b | 7 | * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>. |
ac27a0ec DK |
8 | * Extended attributes for symlinks and special files added per |
9 | * suggestion of Luka Renko <luka.renko@hermes.si>. | |
10 | * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, | |
11 | * Red Hat Inc. | |
12 | * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz | |
13 | * and Andreas Gruenbacher <agruen@suse.de>. | |
14 | */ | |
15 | ||
16 | /* | |
17 | * Extended attributes are stored directly in inodes (on file systems with | |
18 | * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl | |
19 | * field contains the block number if an inode uses an additional block. All | |
20 | * attributes must fit in the inode and one additional block. Blocks that | |
21 | * contain the identical set of attributes may be shared among several inodes. | |
22 | * Identical blocks are detected by keeping a cache of blocks that have | |
23 | * recently been accessed. | |
24 | * | |
25 | * The attributes in inodes and on blocks have a different header; the entries | |
26 | * are stored in the same format: | |
27 | * | |
28 | * +------------------+ | |
29 | * | header | | |
30 | * | entry 1 | | | |
31 | * | entry 2 | | growing downwards | |
32 | * | entry 3 | v | |
33 | * | four null bytes | | |
34 | * | . . . | | |
35 | * | value 1 | ^ | |
36 | * | value 3 | | growing upwards | |
37 | * | value 2 | | | |
38 | * +------------------+ | |
39 | * | |
40 | * The header is followed by multiple entry descriptors. In disk blocks, the | |
41 | * entry descriptors are kept sorted. In inodes, they are unsorted. The | |
42 | * attribute values are aligned to the end of the block in no specific order. | |
43 | * | |
44 | * Locking strategy | |
45 | * ---------------- | |
617ba13b | 46 | * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem. |
ac27a0ec DK |
47 | * EA blocks are only changed if they are exclusive to an inode, so |
48 | * holding xattr_sem also means that nothing but the EA block's reference | |
49 | * count can change. Multiple writers to the same block are synchronized | |
50 | * by the buffer lock. | |
51 | */ | |
52 | ||
53 | #include <linux/init.h> | |
54 | #include <linux/fs.h> | |
55 | #include <linux/slab.h> | |
7a2508e1 | 56 | #include <linux/mbcache.h> |
ac27a0ec | 57 | #include <linux/quotaops.h> |
3dcf5451 CH |
58 | #include "ext4_jbd2.h" |
59 | #include "ext4.h" | |
ac27a0ec DK |
60 | #include "xattr.h" |
61 | #include "acl.h" | |
62 | ||
617ba13b | 63 | #ifdef EXT4_XATTR_DEBUG |
d74f3d25 JP |
64 | # define ea_idebug(inode, fmt, ...) \ |
65 | printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \ | |
66 | inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__) | |
67 | # define ea_bdebug(bh, fmt, ...) \ | |
68 | printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \ | |
69 | bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__) | |
ac27a0ec | 70 | #else |
ace36ad4 JP |
71 | # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
72 | # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) | |
ac27a0ec DK |
73 | #endif |
74 | ||
47387409 TE |
75 | static void ext4_xattr_block_cache_insert(struct mb_cache *, |
76 | struct buffer_head *); | |
77 | static struct buffer_head * | |
78 | ext4_xattr_block_cache_find(struct inode *, struct ext4_xattr_header *, | |
79 | struct mb_cache_entry **); | |
b9fc761e TE |
80 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
81 | size_t value_count); | |
daf83281 | 82 | static void ext4_xattr_rehash(struct ext4_xattr_header *); |
ac27a0ec | 83 | |
d6006186 | 84 | static const struct xattr_handler * const ext4_xattr_handler_map[] = { |
617ba13b | 85 | [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, |
03010a33 | 86 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
87 | [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
88 | [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, | |
ac27a0ec | 89 | #endif |
617ba13b | 90 | [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, |
03010a33 | 91 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 92 | [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, |
ac27a0ec DK |
93 | #endif |
94 | }; | |
95 | ||
11e27528 | 96 | const struct xattr_handler *ext4_xattr_handlers[] = { |
617ba13b MC |
97 | &ext4_xattr_user_handler, |
98 | &ext4_xattr_trusted_handler, | |
03010a33 | 99 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
100 | &posix_acl_access_xattr_handler, |
101 | &posix_acl_default_xattr_handler, | |
ac27a0ec | 102 | #endif |
03010a33 | 103 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 104 | &ext4_xattr_security_handler, |
ac27a0ec DK |
105 | #endif |
106 | NULL | |
107 | }; | |
108 | ||
47387409 TE |
109 | #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ |
110 | inode->i_sb->s_fs_info)->s_ea_block_cache) | |
9c191f70 | 111 | |
dec214d0 TE |
112 | #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ |
113 | inode->i_sb->s_fs_info)->s_ea_inode_cache) | |
114 | ||
30a7eb97 TE |
115 | static int |
116 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, | |
117 | struct inode *inode); | |
118 | ||
33d201e0 TE |
119 | #ifdef CONFIG_LOCKDEP |
120 | void ext4_xattr_inode_set_class(struct inode *ea_inode) | |
121 | { | |
122 | lockdep_set_subclass(&ea_inode->i_rwsem, 1); | |
123 | } | |
124 | #endif | |
125 | ||
cc8e94fd DW |
126 | static __le32 ext4_xattr_block_csum(struct inode *inode, |
127 | sector_t block_nr, | |
128 | struct ext4_xattr_header *hdr) | |
129 | { | |
130 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
d6a77105 | 131 | __u32 csum; |
d6a77105 | 132 | __le64 dsk_block_nr = cpu_to_le64(block_nr); |
b47820ed DJ |
133 | __u32 dummy_csum = 0; |
134 | int offset = offsetof(struct ext4_xattr_header, h_checksum); | |
cc8e94fd | 135 | |
d6a77105 TT |
136 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, |
137 | sizeof(dsk_block_nr)); | |
b47820ed DJ |
138 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); |
139 | csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); | |
140 | offset += sizeof(dummy_csum); | |
141 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, | |
142 | EXT4_BLOCK_SIZE(inode->i_sb) - offset); | |
41eb70dd | 143 | |
cc8e94fd DW |
144 | return cpu_to_le32(csum); |
145 | } | |
146 | ||
147 | static int ext4_xattr_block_csum_verify(struct inode *inode, | |
dac7a4b4 | 148 | struct buffer_head *bh) |
cc8e94fd | 149 | { |
dac7a4b4 TT |
150 | struct ext4_xattr_header *hdr = BHDR(bh); |
151 | int ret = 1; | |
cc8e94fd | 152 | |
dac7a4b4 TT |
153 | if (ext4_has_metadata_csum(inode->i_sb)) { |
154 | lock_buffer(bh); | |
155 | ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, | |
156 | bh->b_blocknr, hdr)); | |
157 | unlock_buffer(bh); | |
158 | } | |
159 | return ret; | |
cc8e94fd DW |
160 | } |
161 | ||
dac7a4b4 TT |
162 | static void ext4_xattr_block_csum_set(struct inode *inode, |
163 | struct buffer_head *bh) | |
cc8e94fd | 164 | { |
dac7a4b4 TT |
165 | if (ext4_has_metadata_csum(inode->i_sb)) |
166 | BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, | |
167 | bh->b_blocknr, BHDR(bh)); | |
cc8e94fd DW |
168 | } |
169 | ||
11e27528 | 170 | static inline const struct xattr_handler * |
617ba13b | 171 | ext4_xattr_handler(int name_index) |
ac27a0ec | 172 | { |
11e27528 | 173 | const struct xattr_handler *handler = NULL; |
ac27a0ec | 174 | |
617ba13b MC |
175 | if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
176 | handler = ext4_xattr_handler_map[name_index]; | |
ac27a0ec DK |
177 | return handler; |
178 | } | |
179 | ||
ac27a0ec | 180 | static int |
2c4f9923 EB |
181 | ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, |
182 | void *value_start) | |
ac27a0ec | 183 | { |
a0626e75 DW |
184 | struct ext4_xattr_entry *e = entry; |
185 | ||
d7614cc1 | 186 | /* Find the end of the names list */ |
a0626e75 DW |
187 | while (!IS_LAST_ENTRY(e)) { |
188 | struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); | |
ac27a0ec | 189 | if ((void *)next >= end) |
6a797d27 | 190 | return -EFSCORRUPTED; |
a0626e75 | 191 | e = next; |
ac27a0ec | 192 | } |
a0626e75 | 193 | |
d7614cc1 | 194 | /* Check the values */ |
a0626e75 | 195 | while (!IS_LAST_ENTRY(entry)) { |
e50e5129 AD |
196 | if (entry->e_value_size != 0 && |
197 | entry->e_value_inum == 0) { | |
d7614cc1 EB |
198 | u16 offs = le16_to_cpu(entry->e_value_offs); |
199 | u32 size = le32_to_cpu(entry->e_value_size); | |
200 | void *value; | |
201 | ||
202 | /* | |
203 | * The value cannot overlap the names, and the value | |
204 | * with padding cannot extend beyond 'end'. Check both | |
205 | * the padded and unpadded sizes, since the size may | |
206 | * overflow to 0 when adding padding. | |
207 | */ | |
208 | if (offs > end - value_start) | |
209 | return -EFSCORRUPTED; | |
210 | value = value_start + offs; | |
211 | if (value < (void *)e + sizeof(u32) || | |
212 | size > end - value || | |
213 | EXT4_XATTR_SIZE(size) > end - value) | |
214 | return -EFSCORRUPTED; | |
215 | } | |
a0626e75 DW |
216 | entry = EXT4_XATTR_NEXT(entry); |
217 | } | |
218 | ||
ac27a0ec DK |
219 | return 0; |
220 | } | |
221 | ||
222 | static inline int | |
cc8e94fd | 223 | ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) |
ac27a0ec | 224 | { |
cc8e94fd DW |
225 | int error; |
226 | ||
227 | if (buffer_verified(bh)) | |
228 | return 0; | |
229 | ||
617ba13b | 230 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 231 | BHDR(bh)->h_blocks != cpu_to_le32(1)) |
6a797d27 | 232 | return -EFSCORRUPTED; |
dac7a4b4 | 233 | if (!ext4_xattr_block_csum_verify(inode, bh)) |
6a797d27 | 234 | return -EFSBADCRC; |
2c4f9923 EB |
235 | error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, |
236 | bh->b_data); | |
cc8e94fd DW |
237 | if (!error) |
238 | set_buffer_verified(bh); | |
239 | return error; | |
ac27a0ec DK |
240 | } |
241 | ||
9e92f48c TT |
242 | static int |
243 | __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, | |
244 | void *end, const char *function, unsigned int line) | |
245 | { | |
9e92f48c TT |
246 | int error = -EFSCORRUPTED; |
247 | ||
290ab230 | 248 | if (end - (void *)header < sizeof(*header) + sizeof(u32) || |
19962509 | 249 | (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) |
9e92f48c | 250 | goto errout; |
2c4f9923 | 251 | error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); |
9e92f48c TT |
252 | errout: |
253 | if (error) | |
254 | __ext4_error_inode(inode, function, line, 0, | |
255 | "corrupted in-inode xattr"); | |
256 | return error; | |
257 | } | |
258 | ||
259 | #define xattr_check_inode(inode, header, end) \ | |
260 | __xattr_check_inode((inode), (header), (end), __func__, __LINE__) | |
261 | ||
ac27a0ec | 262 | static int |
617ba13b | 263 | ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, |
6ba644b9 | 264 | const char *name, int sorted) |
ac27a0ec | 265 | { |
617ba13b | 266 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
267 | size_t name_len; |
268 | int cmp = 1; | |
269 | ||
270 | if (name == NULL) | |
271 | return -EINVAL; | |
272 | name_len = strlen(name); | |
273 | entry = *pentry; | |
617ba13b | 274 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
ac27a0ec DK |
275 | cmp = name_index - entry->e_name_index; |
276 | if (!cmp) | |
277 | cmp = name_len - entry->e_name_len; | |
278 | if (!cmp) | |
279 | cmp = memcmp(name, entry->e_name, name_len); | |
280 | if (cmp <= 0 && (sorted || cmp == 0)) | |
281 | break; | |
282 | } | |
283 | *pentry = entry; | |
ac27a0ec DK |
284 | return cmp ? -ENODATA : 0; |
285 | } | |
286 | ||
dec214d0 TE |
287 | static u32 |
288 | ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) | |
289 | { | |
290 | return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); | |
291 | } | |
292 | ||
293 | static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) | |
294 | { | |
295 | return ((u64)ea_inode->i_ctime.tv_sec << 32) | | |
296 | ((u32)ea_inode->i_version); | |
297 | } | |
298 | ||
299 | static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) | |
300 | { | |
301 | ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); | |
302 | ea_inode->i_version = (u32)ref_count; | |
303 | } | |
304 | ||
305 | static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) | |
306 | { | |
307 | return (u32)ea_inode->i_atime.tv_sec; | |
308 | } | |
309 | ||
310 | static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) | |
311 | { | |
312 | ea_inode->i_atime.tv_sec = hash; | |
313 | } | |
314 | ||
e50e5129 AD |
315 | /* |
316 | * Read the EA value from an inode. | |
317 | */ | |
90966693 | 318 | static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) |
e50e5129 | 319 | { |
9699d4f9 TE |
320 | int blocksize = 1 << ea_inode->i_blkbits; |
321 | int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; | |
322 | int tail_size = (size % blocksize) ?: blocksize; | |
323 | struct buffer_head *bhs_inline[8]; | |
324 | struct buffer_head **bhs = bhs_inline; | |
325 | int i, ret; | |
326 | ||
327 | if (bh_count > ARRAY_SIZE(bhs_inline)) { | |
328 | bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); | |
329 | if (!bhs) | |
330 | return -ENOMEM; | |
331 | } | |
90966693 | 332 | |
9699d4f9 TE |
333 | ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, |
334 | true /* wait */, bhs); | |
335 | if (ret) | |
336 | goto free_bhs; | |
e50e5129 | 337 | |
9699d4f9 TE |
338 | for (i = 0; i < bh_count; i++) { |
339 | /* There shouldn't be any holes in ea_inode. */ | |
340 | if (!bhs[i]) { | |
341 | ret = -EFSCORRUPTED; | |
342 | goto put_bhs; | |
343 | } | |
344 | memcpy((char *)buf + blocksize * i, bhs[i]->b_data, | |
345 | i < bh_count - 1 ? blocksize : tail_size); | |
e50e5129 | 346 | } |
9699d4f9 TE |
347 | ret = 0; |
348 | put_bhs: | |
349 | for (i = 0; i < bh_count; i++) | |
350 | brelse(bhs[i]); | |
351 | free_bhs: | |
352 | if (bhs != bhs_inline) | |
353 | kfree(bhs); | |
354 | return ret; | |
e50e5129 AD |
355 | } |
356 | ||
bab79b04 TE |
357 | static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, |
358 | struct inode **ea_inode) | |
e50e5129 | 359 | { |
bab79b04 TE |
360 | struct inode *inode; |
361 | int err; | |
e50e5129 | 362 | |
bab79b04 TE |
363 | inode = ext4_iget(parent->i_sb, ea_ino); |
364 | if (IS_ERR(inode)) { | |
365 | err = PTR_ERR(inode); | |
dec214d0 TE |
366 | ext4_error(parent->i_sb, |
367 | "error while reading EA inode %lu err=%d", ea_ino, | |
368 | err); | |
bab79b04 | 369 | return err; |
e50e5129 AD |
370 | } |
371 | ||
bab79b04 | 372 | if (is_bad_inode(inode)) { |
dec214d0 TE |
373 | ext4_error(parent->i_sb, |
374 | "error while reading EA inode %lu is_bad_inode", | |
375 | ea_ino); | |
bab79b04 TE |
376 | err = -EIO; |
377 | goto error; | |
378 | } | |
379 | ||
bab79b04 | 380 | if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { |
dec214d0 TE |
381 | ext4_error(parent->i_sb, |
382 | "EA inode %lu does not have EXT4_EA_INODE_FL flag", | |
383 | ea_ino); | |
bab79b04 | 384 | err = -EINVAL; |
e50e5129 AD |
385 | goto error; |
386 | } | |
387 | ||
bab79b04 TE |
388 | *ea_inode = inode; |
389 | return 0; | |
e50e5129 | 390 | error: |
bab79b04 TE |
391 | iput(inode); |
392 | return err; | |
e50e5129 AD |
393 | } |
394 | ||
dec214d0 | 395 | static int |
b9fc761e TE |
396 | ext4_xattr_inode_verify_hashes(struct inode *ea_inode, |
397 | struct ext4_xattr_entry *entry, void *buffer, | |
398 | size_t size) | |
dec214d0 TE |
399 | { |
400 | u32 hash; | |
401 | ||
402 | /* Verify stored hash matches calculated hash. */ | |
403 | hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); | |
404 | if (hash != ext4_xattr_inode_get_hash(ea_inode)) | |
405 | return -EFSCORRUPTED; | |
b9fc761e TE |
406 | |
407 | if (entry) { | |
408 | __le32 e_hash, tmp_data; | |
409 | ||
410 | /* Verify entry hash. */ | |
411 | tmp_data = cpu_to_le32(hash); | |
412 | e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, | |
413 | &tmp_data, 1); | |
414 | if (e_hash != entry->e_hash) | |
415 | return -EFSCORRUPTED; | |
416 | } | |
dec214d0 TE |
417 | return 0; |
418 | } | |
419 | ||
420 | #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) | |
421 | ||
e50e5129 | 422 | /* |
b9fc761e | 423 | * Read xattr value from the EA inode. |
e50e5129 AD |
424 | */ |
425 | static int | |
b9fc761e TE |
426 | ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, |
427 | void *buffer, size_t size) | |
e50e5129 | 428 | { |
dec214d0 | 429 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); |
bab79b04 | 430 | struct inode *ea_inode; |
dec214d0 | 431 | int err; |
e50e5129 | 432 | |
b9fc761e TE |
433 | err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), |
434 | &ea_inode); | |
dec214d0 TE |
435 | if (err) { |
436 | ea_inode = NULL; | |
437 | goto out; | |
438 | } | |
e50e5129 | 439 | |
dec214d0 TE |
440 | if (i_size_read(ea_inode) != size) { |
441 | ext4_warning_inode(ea_inode, | |
442 | "ea_inode file size=%llu entry size=%zu", | |
443 | i_size_read(ea_inode), size); | |
444 | err = -EFSCORRUPTED; | |
445 | goto out; | |
446 | } | |
e50e5129 | 447 | |
dec214d0 TE |
448 | err = ext4_xattr_inode_read(ea_inode, buffer, size); |
449 | if (err) | |
450 | goto out; | |
451 | ||
b9fc761e | 452 | err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, size); |
dec214d0 TE |
453 | /* |
454 | * Compatibility check for old Lustre ea_inode implementation. Old | |
455 | * version does not have hash validation, but it has a backpointer | |
456 | * from ea_inode to the parent inode. | |
457 | */ | |
458 | if (err == -EFSCORRUPTED) { | |
459 | if (EXT4_XATTR_INODE_GET_PARENT(ea_inode) != inode->i_ino || | |
460 | ea_inode->i_generation != inode->i_generation) { | |
461 | ext4_warning_inode(ea_inode, | |
462 | "EA inode hash validation failed"); | |
463 | goto out; | |
464 | } | |
465 | /* Do not add ea_inode to the cache. */ | |
466 | ea_inode_cache = NULL; | |
191eac33 | 467 | err = 0; |
dec214d0 TE |
468 | } else if (err) |
469 | goto out; | |
470 | ||
471 | if (ea_inode_cache) | |
472 | mb_cache_entry_create(ea_inode_cache, GFP_NOFS, | |
473 | ext4_xattr_inode_get_hash(ea_inode), | |
474 | ea_inode->i_ino, true /* reusable */); | |
475 | out: | |
476 | iput(ea_inode); | |
477 | return err; | |
e50e5129 AD |
478 | } |
479 | ||
ac27a0ec | 480 | static int |
617ba13b | 481 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
482 | void *buffer, size_t buffer_size) |
483 | { | |
484 | struct buffer_head *bh = NULL; | |
617ba13b | 485 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
486 | size_t size; |
487 | int error; | |
47387409 | 488 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec DK |
489 | |
490 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
491 | name_index, name, buffer, (long)buffer_size); | |
492 | ||
493 | error = -ENODATA; | |
617ba13b | 494 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 495 | goto cleanup; |
ace36ad4 JP |
496 | ea_idebug(inode, "reading block %llu", |
497 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 498 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
499 | if (!bh) |
500 | goto cleanup; | |
501 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
502 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 503 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
504 | EXT4_ERROR_INODE(inode, "bad block %llu", |
505 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 506 | error = -EFSCORRUPTED; |
ac27a0ec DK |
507 | goto cleanup; |
508 | } | |
47387409 | 509 | ext4_xattr_block_cache_insert(ea_block_cache, bh); |
ac27a0ec | 510 | entry = BFIRST(bh); |
6ba644b9 | 511 | error = ext4_xattr_find_entry(&entry, name_index, name, 1); |
ac27a0ec DK |
512 | if (error) |
513 | goto cleanup; | |
514 | size = le32_to_cpu(entry->e_value_size); | |
515 | if (buffer) { | |
516 | error = -ERANGE; | |
517 | if (size > buffer_size) | |
518 | goto cleanup; | |
e50e5129 | 519 | if (entry->e_value_inum) { |
b9fc761e TE |
520 | error = ext4_xattr_inode_get(inode, entry, buffer, |
521 | size); | |
e50e5129 AD |
522 | if (error) |
523 | goto cleanup; | |
524 | } else { | |
525 | memcpy(buffer, bh->b_data + | |
526 | le16_to_cpu(entry->e_value_offs), size); | |
527 | } | |
ac27a0ec DK |
528 | } |
529 | error = size; | |
530 | ||
531 | cleanup: | |
532 | brelse(bh); | |
533 | return error; | |
534 | } | |
535 | ||
879b3825 | 536 | int |
617ba13b | 537 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
538 | void *buffer, size_t buffer_size) |
539 | { | |
617ba13b MC |
540 | struct ext4_xattr_ibody_header *header; |
541 | struct ext4_xattr_entry *entry; | |
542 | struct ext4_inode *raw_inode; | |
543 | struct ext4_iloc iloc; | |
ac27a0ec DK |
544 | size_t size; |
545 | void *end; | |
546 | int error; | |
547 | ||
19f5fb7a | 548 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 549 | return -ENODATA; |
617ba13b | 550 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
551 | if (error) |
552 | return error; | |
617ba13b | 553 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 554 | header = IHDR(inode, raw_inode); |
617ba13b | 555 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 556 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
557 | if (error) |
558 | goto cleanup; | |
6ba644b9 EB |
559 | entry = IFIRST(header); |
560 | error = ext4_xattr_find_entry(&entry, name_index, name, 0); | |
ac27a0ec DK |
561 | if (error) |
562 | goto cleanup; | |
563 | size = le32_to_cpu(entry->e_value_size); | |
564 | if (buffer) { | |
565 | error = -ERANGE; | |
566 | if (size > buffer_size) | |
567 | goto cleanup; | |
e50e5129 | 568 | if (entry->e_value_inum) { |
b9fc761e TE |
569 | error = ext4_xattr_inode_get(inode, entry, buffer, |
570 | size); | |
e50e5129 AD |
571 | if (error) |
572 | goto cleanup; | |
573 | } else { | |
574 | memcpy(buffer, (void *)IFIRST(header) + | |
575 | le16_to_cpu(entry->e_value_offs), size); | |
576 | } | |
ac27a0ec DK |
577 | } |
578 | error = size; | |
579 | ||
580 | cleanup: | |
581 | brelse(iloc.bh); | |
582 | return error; | |
583 | } | |
584 | ||
585 | /* | |
617ba13b | 586 | * ext4_xattr_get() |
ac27a0ec DK |
587 | * |
588 | * Copy an extended attribute into the buffer | |
589 | * provided, or compute the buffer size required. | |
590 | * Buffer is NULL to compute the size of the buffer required. | |
591 | * | |
592 | * Returns a negative error number on failure, or the number of bytes | |
593 | * used / required on success. | |
594 | */ | |
595 | int | |
617ba13b | 596 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
597 | void *buffer, size_t buffer_size) |
598 | { | |
599 | int error; | |
600 | ||
0db1ff22 TT |
601 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
602 | return -EIO; | |
603 | ||
230b8c1a ZZ |
604 | if (strlen(name) > 255) |
605 | return -ERANGE; | |
606 | ||
617ba13b MC |
607 | down_read(&EXT4_I(inode)->xattr_sem); |
608 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
609 | buffer_size); |
610 | if (error == -ENODATA) | |
617ba13b | 611 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 612 | buffer_size); |
617ba13b | 613 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
614 | return error; |
615 | } | |
616 | ||
617 | static int | |
431547b3 | 618 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
619 | char *buffer, size_t buffer_size) |
620 | { | |
621 | size_t rest = buffer_size; | |
622 | ||
617ba13b | 623 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 624 | const struct xattr_handler *handler = |
617ba13b | 625 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec | 626 | |
764a5c6b AG |
627 | if (handler && (!handler->list || handler->list(dentry))) { |
628 | const char *prefix = handler->prefix ?: handler->name; | |
629 | size_t prefix_len = strlen(prefix); | |
630 | size_t size = prefix_len + entry->e_name_len + 1; | |
631 | ||
ac27a0ec DK |
632 | if (buffer) { |
633 | if (size > rest) | |
634 | return -ERANGE; | |
764a5c6b AG |
635 | memcpy(buffer, prefix, prefix_len); |
636 | buffer += prefix_len; | |
637 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
638 | buffer += entry->e_name_len; | |
639 | *buffer++ = 0; | |
ac27a0ec DK |
640 | } |
641 | rest -= size; | |
642 | } | |
643 | } | |
764a5c6b | 644 | return buffer_size - rest; /* total size */ |
ac27a0ec DK |
645 | } |
646 | ||
647 | static int | |
431547b3 | 648 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 649 | { |
2b0143b5 | 650 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
651 | struct buffer_head *bh = NULL; |
652 | int error; | |
653 | ||
654 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
655 | buffer, (long)buffer_size); | |
656 | ||
657 | error = 0; | |
617ba13b | 658 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 659 | goto cleanup; |
ace36ad4 JP |
660 | ea_idebug(inode, "reading block %llu", |
661 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 662 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
663 | error = -EIO; |
664 | if (!bh) | |
665 | goto cleanup; | |
666 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
667 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 668 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
669 | EXT4_ERROR_INODE(inode, "bad block %llu", |
670 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 671 | error = -EFSCORRUPTED; |
ac27a0ec DK |
672 | goto cleanup; |
673 | } | |
47387409 | 674 | ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); |
431547b3 | 675 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); |
ac27a0ec DK |
676 | |
677 | cleanup: | |
678 | brelse(bh); | |
679 | ||
680 | return error; | |
681 | } | |
682 | ||
683 | static int | |
431547b3 | 684 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 685 | { |
2b0143b5 | 686 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
687 | struct ext4_xattr_ibody_header *header; |
688 | struct ext4_inode *raw_inode; | |
689 | struct ext4_iloc iloc; | |
ac27a0ec DK |
690 | void *end; |
691 | int error; | |
692 | ||
19f5fb7a | 693 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 694 | return 0; |
617ba13b | 695 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
696 | if (error) |
697 | return error; | |
617ba13b | 698 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 699 | header = IHDR(inode, raw_inode); |
617ba13b | 700 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 701 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
702 | if (error) |
703 | goto cleanup; | |
431547b3 | 704 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
705 | buffer, buffer_size); |
706 | ||
707 | cleanup: | |
708 | brelse(iloc.bh); | |
709 | return error; | |
710 | } | |
711 | ||
712 | /* | |
ba7ea1d8 EB |
713 | * Inode operation listxattr() |
714 | * | |
715 | * d_inode(dentry)->i_rwsem: don't care | |
ac27a0ec DK |
716 | * |
717 | * Copy a list of attribute names into the buffer | |
718 | * provided, or compute the buffer size required. | |
719 | * Buffer is NULL to compute the size of the buffer required. | |
720 | * | |
721 | * Returns a negative error number on failure, or the number of bytes | |
722 | * used / required on success. | |
723 | */ | |
ba7ea1d8 EB |
724 | ssize_t |
725 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
ac27a0ec | 726 | { |
eaeef867 | 727 | int ret, ret2; |
ac27a0ec | 728 | |
2b0143b5 | 729 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
730 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
731 | if (ret < 0) | |
732 | goto errout; | |
733 | if (buffer) { | |
734 | buffer += ret; | |
735 | buffer_size -= ret; | |
ac27a0ec | 736 | } |
eaeef867 TT |
737 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
738 | if (ret < 0) | |
739 | goto errout; | |
740 | ret += ret2; | |
741 | errout: | |
2b0143b5 | 742 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 743 | return ret; |
ac27a0ec DK |
744 | } |
745 | ||
746 | /* | |
617ba13b | 747 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
748 | * not set, set it. |
749 | */ | |
617ba13b | 750 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
751 | struct super_block *sb) |
752 | { | |
e2b911c5 | 753 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
754 | return; |
755 | ||
5d601255 | 756 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 757 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
e2b911c5 | 758 | ext4_set_feature_xattr(sb); |
a0375156 | 759 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec | 760 | } |
ac27a0ec DK |
761 | } |
762 | ||
7a9ca53a TE |
763 | int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) |
764 | { | |
765 | struct ext4_iloc iloc = { .bh = NULL }; | |
766 | struct buffer_head *bh = NULL; | |
767 | struct ext4_inode *raw_inode; | |
768 | struct ext4_xattr_ibody_header *header; | |
769 | struct ext4_xattr_entry *entry; | |
770 | qsize_t ea_inode_refs = 0; | |
771 | void *end; | |
772 | int ret; | |
773 | ||
774 | lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); | |
775 | ||
776 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
777 | ret = ext4_get_inode_loc(inode, &iloc); | |
778 | if (ret) | |
779 | goto out; | |
780 | raw_inode = ext4_raw_inode(&iloc); | |
781 | header = IHDR(inode, raw_inode); | |
782 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
783 | ret = xattr_check_inode(inode, header, end); | |
784 | if (ret) | |
785 | goto out; | |
786 | ||
787 | for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); | |
788 | entry = EXT4_XATTR_NEXT(entry)) | |
789 | if (entry->e_value_inum) | |
790 | ea_inode_refs++; | |
791 | } | |
792 | ||
793 | if (EXT4_I(inode)->i_file_acl) { | |
794 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
795 | if (!bh) { | |
796 | ret = -EIO; | |
797 | goto out; | |
798 | } | |
799 | ||
800 | if (ext4_xattr_check_block(inode, bh)) { | |
801 | ret = -EFSCORRUPTED; | |
802 | goto out; | |
803 | } | |
804 | ||
805 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
806 | entry = EXT4_XATTR_NEXT(entry)) | |
807 | if (entry->e_value_inum) | |
808 | ea_inode_refs++; | |
809 | } | |
810 | *usage = ea_inode_refs + 1; | |
811 | ret = 0; | |
812 | out: | |
813 | brelse(iloc.bh); | |
814 | brelse(bh); | |
815 | return ret; | |
816 | } | |
817 | ||
dec214d0 TE |
818 | static inline size_t round_up_cluster(struct inode *inode, size_t length) |
819 | { | |
820 | struct super_block *sb = inode->i_sb; | |
821 | size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + | |
822 | inode->i_blkbits); | |
823 | size_t mask = ~(cluster_size - 1); | |
824 | ||
825 | return (length + cluster_size - 1) & mask; | |
826 | } | |
827 | ||
828 | static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) | |
829 | { | |
830 | int err; | |
831 | ||
832 | err = dquot_alloc_inode(inode); | |
833 | if (err) | |
834 | return err; | |
835 | err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); | |
836 | if (err) | |
837 | dquot_free_inode(inode); | |
838 | return err; | |
839 | } | |
840 | ||
841 | static void ext4_xattr_inode_free_quota(struct inode *inode, size_t len) | |
842 | { | |
843 | dquot_free_space_nodirty(inode, round_up_cluster(inode, len)); | |
844 | dquot_free_inode(inode); | |
845 | } | |
846 | ||
af65207c TE |
847 | int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, |
848 | struct buffer_head *block_bh, size_t value_len, | |
849 | bool is_create) | |
dec214d0 | 850 | { |
dec214d0 TE |
851 | int credits; |
852 | int blocks; | |
853 | ||
854 | /* | |
855 | * 1) Owner inode update | |
856 | * 2) Ref count update on old xattr block | |
857 | * 3) new xattr block | |
858 | * 4) block bitmap update for new xattr block | |
859 | * 5) group descriptor for new xattr block | |
860 | * 6) block bitmap update for old xattr block | |
861 | * 7) group descriptor for old block | |
862 | * | |
863 | * 6 & 7 can happen if we have two racing threads T_a and T_b | |
864 | * which are each trying to set an xattr on inodes I_a and I_b | |
865 | * which were both initially sharing an xattr block. | |
866 | */ | |
867 | credits = 7; | |
868 | ||
869 | /* Quota updates. */ | |
870 | credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); | |
871 | ||
872 | /* | |
873 | * In case of inline data, we may push out the data to a block, | |
874 | * so we need to reserve credits for this eventuality | |
875 | */ | |
af65207c | 876 | if (inode && ext4_has_inline_data(inode)) |
dec214d0 TE |
877 | credits += ext4_writepage_trans_blocks(inode) + 1; |
878 | ||
879 | /* We are done if ea_inode feature is not enabled. */ | |
880 | if (!ext4_has_feature_ea_inode(sb)) | |
881 | return credits; | |
882 | ||
883 | /* New ea_inode, inode map, block bitmap, group descriptor. */ | |
884 | credits += 4; | |
885 | ||
886 | /* Data blocks. */ | |
887 | blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; | |
888 | ||
889 | /* Indirection block or one level of extent tree. */ | |
890 | blocks += 1; | |
891 | ||
892 | /* Block bitmap and group descriptor updates for each block. */ | |
893 | credits += blocks * 2; | |
894 | ||
895 | /* Blocks themselves. */ | |
896 | credits += blocks; | |
897 | ||
af65207c TE |
898 | if (!is_create) { |
899 | /* Dereference ea_inode holding old xattr value. | |
900 | * Old ea_inode, inode map, block bitmap, group descriptor. | |
901 | */ | |
902 | credits += 4; | |
dec214d0 | 903 | |
af65207c TE |
904 | /* Data blocks for old ea_inode. */ |
905 | blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; | |
dec214d0 | 906 | |
af65207c TE |
907 | /* Indirection block or one level of extent tree for old |
908 | * ea_inode. | |
909 | */ | |
910 | blocks += 1; | |
dec214d0 | 911 | |
af65207c TE |
912 | /* Block bitmap and group descriptor updates for each block. */ |
913 | credits += blocks * 2; | |
914 | } | |
dec214d0 TE |
915 | |
916 | /* We may need to clone the existing xattr block in which case we need | |
917 | * to increment ref counts for existing ea_inodes referenced by it. | |
918 | */ | |
919 | if (block_bh) { | |
920 | struct ext4_xattr_entry *entry = BFIRST(block_bh); | |
921 | ||
922 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) | |
923 | if (entry->e_value_inum) | |
924 | /* Ref count update on ea_inode. */ | |
925 | credits += 1; | |
926 | } | |
927 | return credits; | |
928 | } | |
929 | ||
30a7eb97 TE |
930 | static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode, |
931 | int credits, struct buffer_head *bh, | |
932 | bool dirty, bool block_csum) | |
933 | { | |
934 | int error; | |
935 | ||
936 | if (!ext4_handle_valid(handle)) | |
937 | return 0; | |
938 | ||
939 | if (handle->h_buffer_credits >= credits) | |
940 | return 0; | |
941 | ||
942 | error = ext4_journal_extend(handle, credits - handle->h_buffer_credits); | |
943 | if (!error) | |
944 | return 0; | |
945 | if (error < 0) { | |
946 | ext4_warning(inode->i_sb, "Extend journal (error %d)", error); | |
947 | return error; | |
948 | } | |
949 | ||
950 | if (bh && dirty) { | |
951 | if (block_csum) | |
952 | ext4_xattr_block_csum_set(inode, bh); | |
953 | error = ext4_handle_dirty_metadata(handle, NULL, bh); | |
954 | if (error) { | |
955 | ext4_warning(inode->i_sb, "Handle metadata (error %d)", | |
956 | error); | |
957 | return error; | |
958 | } | |
959 | } | |
960 | ||
961 | error = ext4_journal_restart(handle, credits); | |
962 | if (error) { | |
963 | ext4_warning(inode->i_sb, "Restart journal (error %d)", error); | |
964 | return error; | |
965 | } | |
966 | ||
967 | if (bh) { | |
968 | error = ext4_journal_get_write_access(handle, bh); | |
969 | if (error) { | |
970 | ext4_warning(inode->i_sb, | |
971 | "Get write access failed (error %d)", | |
972 | error); | |
973 | return error; | |
974 | } | |
975 | } | |
976 | return 0; | |
977 | } | |
978 | ||
dec214d0 TE |
979 | static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, |
980 | int ref_change) | |
981 | { | |
982 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); | |
983 | struct ext4_iloc iloc; | |
984 | s64 ref_count; | |
985 | u32 hash; | |
986 | int ret; | |
987 | ||
988 | inode_lock(ea_inode); | |
989 | ||
990 | ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); | |
991 | if (ret) { | |
992 | iloc.bh = NULL; | |
993 | goto out; | |
994 | } | |
995 | ||
996 | ref_count = ext4_xattr_inode_get_ref(ea_inode); | |
997 | ref_count += ref_change; | |
998 | ext4_xattr_inode_set_ref(ea_inode, ref_count); | |
999 | ||
1000 | if (ref_change > 0) { | |
1001 | WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", | |
1002 | ea_inode->i_ino, ref_count); | |
1003 | ||
1004 | if (ref_count == 1) { | |
1005 | WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", | |
1006 | ea_inode->i_ino, ea_inode->i_nlink); | |
1007 | ||
1008 | set_nlink(ea_inode, 1); | |
1009 | ext4_orphan_del(handle, ea_inode); | |
1010 | ||
cdb7ee4c TE |
1011 | if (ea_inode_cache) { |
1012 | hash = ext4_xattr_inode_get_hash(ea_inode); | |
1013 | mb_cache_entry_create(ea_inode_cache, | |
1014 | GFP_NOFS, hash, | |
1015 | ea_inode->i_ino, | |
1016 | true /* reusable */); | |
1017 | } | |
dec214d0 TE |
1018 | } |
1019 | } else { | |
1020 | WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", | |
1021 | ea_inode->i_ino, ref_count); | |
1022 | ||
1023 | if (ref_count == 0) { | |
1024 | WARN_ONCE(ea_inode->i_nlink != 1, | |
1025 | "EA inode %lu i_nlink=%u", | |
1026 | ea_inode->i_ino, ea_inode->i_nlink); | |
1027 | ||
1028 | clear_nlink(ea_inode); | |
1029 | ext4_orphan_add(handle, ea_inode); | |
1030 | ||
cdb7ee4c TE |
1031 | if (ea_inode_cache) { |
1032 | hash = ext4_xattr_inode_get_hash(ea_inode); | |
1033 | mb_cache_entry_delete(ea_inode_cache, hash, | |
1034 | ea_inode->i_ino); | |
1035 | } | |
dec214d0 TE |
1036 | } |
1037 | } | |
1038 | ||
1039 | ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); | |
1040 | iloc.bh = NULL; | |
1041 | if (ret) | |
1042 | ext4_warning_inode(ea_inode, | |
1043 | "ext4_mark_iloc_dirty() failed ret=%d", ret); | |
1044 | out: | |
1045 | brelse(iloc.bh); | |
1046 | inode_unlock(ea_inode); | |
1047 | return ret; | |
1048 | } | |
1049 | ||
1050 | static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) | |
1051 | { | |
1052 | return ext4_xattr_inode_update_ref(handle, ea_inode, 1); | |
1053 | } | |
1054 | ||
1055 | static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) | |
1056 | { | |
1057 | return ext4_xattr_inode_update_ref(handle, ea_inode, -1); | |
1058 | } | |
1059 | ||
1060 | static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, | |
1061 | struct ext4_xattr_entry *first) | |
1062 | { | |
1063 | struct inode *ea_inode; | |
1064 | struct ext4_xattr_entry *entry; | |
1065 | struct ext4_xattr_entry *failed_entry; | |
1066 | unsigned int ea_ino; | |
1067 | int err, saved_err; | |
1068 | ||
1069 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1070 | entry = EXT4_XATTR_NEXT(entry)) { | |
1071 | if (!entry->e_value_inum) | |
1072 | continue; | |
1073 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
1074 | err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); | |
1075 | if (err) | |
1076 | goto cleanup; | |
1077 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1078 | if (err) { | |
1079 | ext4_warning_inode(ea_inode, "inc ref error %d", err); | |
1080 | iput(ea_inode); | |
1081 | goto cleanup; | |
1082 | } | |
1083 | iput(ea_inode); | |
1084 | } | |
1085 | return 0; | |
1086 | ||
1087 | cleanup: | |
1088 | saved_err = err; | |
1089 | failed_entry = entry; | |
1090 | ||
1091 | for (entry = first; entry != failed_entry; | |
1092 | entry = EXT4_XATTR_NEXT(entry)) { | |
1093 | if (!entry->e_value_inum) | |
1094 | continue; | |
1095 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
1096 | err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); | |
1097 | if (err) { | |
1098 | ext4_warning(parent->i_sb, | |
1099 | "cleanup ea_ino %u iget error %d", ea_ino, | |
1100 | err); | |
1101 | continue; | |
1102 | } | |
1103 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1104 | if (err) | |
1105 | ext4_warning_inode(ea_inode, "cleanup dec ref error %d", | |
1106 | err); | |
1107 | iput(ea_inode); | |
1108 | } | |
1109 | return saved_err; | |
1110 | } | |
1111 | ||
30a7eb97 | 1112 | static void |
dec214d0 TE |
1113 | ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, |
1114 | struct buffer_head *bh, | |
1115 | struct ext4_xattr_entry *first, bool block_csum, | |
1116 | struct ext4_xattr_inode_array **ea_inode_array, | |
1117 | int extra_credits, bool skip_quota) | |
30a7eb97 TE |
1118 | { |
1119 | struct inode *ea_inode; | |
1120 | struct ext4_xattr_entry *entry; | |
1121 | bool dirty = false; | |
1122 | unsigned int ea_ino; | |
1123 | int err; | |
1124 | int credits; | |
1125 | ||
1126 | /* One credit for dec ref on ea_inode, one for orphan list addition, */ | |
1127 | credits = 2 + extra_credits; | |
1128 | ||
1129 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1130 | entry = EXT4_XATTR_NEXT(entry)) { | |
1131 | if (!entry->e_value_inum) | |
1132 | continue; | |
1133 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
1134 | err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); | |
1135 | if (err) | |
1136 | continue; | |
1137 | ||
1138 | err = ext4_expand_inode_array(ea_inode_array, ea_inode); | |
1139 | if (err) { | |
1140 | ext4_warning_inode(ea_inode, | |
1141 | "Expand inode array err=%d", err); | |
1142 | iput(ea_inode); | |
1143 | continue; | |
1144 | } | |
1145 | ||
1146 | err = ext4_xattr_ensure_credits(handle, parent, credits, bh, | |
1147 | dirty, block_csum); | |
1148 | if (err) { | |
1149 | ext4_warning_inode(ea_inode, "Ensure credits err=%d", | |
1150 | err); | |
1151 | continue; | |
1152 | } | |
1153 | ||
dec214d0 TE |
1154 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); |
1155 | if (err) { | |
1156 | ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", | |
1157 | err); | |
1158 | continue; | |
1159 | } | |
1160 | ||
1161 | if (!skip_quota) | |
1162 | ext4_xattr_inode_free_quota(parent, | |
1163 | le32_to_cpu(entry->e_value_size)); | |
30a7eb97 TE |
1164 | |
1165 | /* | |
1166 | * Forget about ea_inode within the same transaction that | |
1167 | * decrements the ref count. This avoids duplicate decrements in | |
1168 | * case the rest of the work spills over to subsequent | |
1169 | * transactions. | |
1170 | */ | |
1171 | entry->e_value_inum = 0; | |
1172 | entry->e_value_size = 0; | |
1173 | ||
1174 | dirty = true; | |
1175 | } | |
1176 | ||
1177 | if (dirty) { | |
1178 | /* | |
1179 | * Note that we are deliberately skipping csum calculation for | |
1180 | * the final update because we do not expect any journal | |
1181 | * restarts until xattr block is freed. | |
1182 | */ | |
1183 | ||
1184 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
1185 | if (err) | |
1186 | ext4_warning_inode(parent, | |
1187 | "handle dirty metadata err=%d", err); | |
1188 | } | |
1189 | } | |
1190 | ||
ac27a0ec | 1191 | /* |
ec4cb1aa JK |
1192 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
1193 | * otherwise free the block. | |
ac27a0ec DK |
1194 | */ |
1195 | static void | |
617ba13b | 1196 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
dec214d0 TE |
1197 | struct buffer_head *bh, |
1198 | struct ext4_xattr_inode_array **ea_inode_array, | |
1199 | int extra_credits) | |
ac27a0ec | 1200 | { |
47387409 | 1201 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
6048c64b | 1202 | u32 hash, ref; |
8a2bfdcb | 1203 | int error = 0; |
ac27a0ec | 1204 | |
5d601255 | 1205 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
1206 | error = ext4_journal_get_write_access(handle, bh); |
1207 | if (error) | |
1208 | goto out; | |
1209 | ||
1210 | lock_buffer(bh); | |
6048c64b AG |
1211 | hash = le32_to_cpu(BHDR(bh)->h_hash); |
1212 | ref = le32_to_cpu(BHDR(bh)->h_refcount); | |
1213 | if (ref == 1) { | |
ac27a0ec | 1214 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
1215 | /* |
1216 | * This must happen under buffer lock for | |
1217 | * ext4_xattr_block_set() to reliably detect freed block | |
1218 | */ | |
cdb7ee4c TE |
1219 | if (ea_block_cache) |
1220 | mb_cache_entry_delete(ea_block_cache, hash, | |
1221 | bh->b_blocknr); | |
ac27a0ec | 1222 | get_bh(bh); |
ec4cb1aa | 1223 | unlock_buffer(bh); |
dec214d0 TE |
1224 | |
1225 | if (ext4_has_feature_ea_inode(inode->i_sb)) | |
1226 | ext4_xattr_inode_dec_ref_all(handle, inode, bh, | |
1227 | BFIRST(bh), | |
1228 | true /* block_csum */, | |
1229 | ea_inode_array, | |
1230 | extra_credits, | |
1231 | true /* skip_quota */); | |
e6362609 TT |
1232 | ext4_free_blocks(handle, inode, bh, 0, 1, |
1233 | EXT4_FREE_BLOCKS_METADATA | | |
1234 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 1235 | } else { |
6048c64b AG |
1236 | ref--; |
1237 | BHDR(bh)->h_refcount = cpu_to_le32(ref); | |
1238 | if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { | |
1239 | struct mb_cache_entry *ce; | |
1240 | ||
cdb7ee4c TE |
1241 | if (ea_block_cache) { |
1242 | ce = mb_cache_entry_get(ea_block_cache, hash, | |
1243 | bh->b_blocknr); | |
1244 | if (ce) { | |
1245 | ce->e_reusable = 1; | |
1246 | mb_cache_entry_put(ea_block_cache, ce); | |
1247 | } | |
6048c64b AG |
1248 | } |
1249 | } | |
1250 | ||
dac7a4b4 | 1251 | ext4_xattr_block_csum_set(inode, bh); |
ec4cb1aa JK |
1252 | /* |
1253 | * Beware of this ugliness: Releasing of xattr block references | |
1254 | * from different inodes can race and so we have to protect | |
1255 | * from a race where someone else frees the block (and releases | |
1256 | * its journal_head) before we are done dirtying the buffer. In | |
1257 | * nojournal mode this race is harmless and we actually cannot | |
dac7a4b4 | 1258 | * call ext4_handle_dirty_metadata() with locked buffer as |
ec4cb1aa JK |
1259 | * that function can call sync_dirty_buffer() so for that case |
1260 | * we handle the dirtying after unlocking the buffer. | |
1261 | */ | |
1262 | if (ext4_handle_valid(handle)) | |
dac7a4b4 | 1263 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
c1bb05a6 | 1264 | unlock_buffer(bh); |
ec4cb1aa | 1265 | if (!ext4_handle_valid(handle)) |
dac7a4b4 | 1266 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
8a2bfdcb | 1267 | if (IS_SYNC(inode)) |
0390131b | 1268 | ext4_handle_sync(handle); |
1231b3a1 | 1269 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
1270 | ea_bdebug(bh, "refcount now=%d; releasing", |
1271 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 1272 | } |
8a2bfdcb MC |
1273 | out: |
1274 | ext4_std_error(inode->i_sb, error); | |
1275 | return; | |
ac27a0ec DK |
1276 | } |
1277 | ||
6dd4ee7c KS |
1278 | /* |
1279 | * Find the available free space for EAs. This also returns the total number of | |
1280 | * bytes used by EA entries. | |
1281 | */ | |
1282 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
1283 | size_t *min_offs, void *base, int *total) | |
1284 | { | |
1285 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 1286 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
1287 | size_t offs = le16_to_cpu(last->e_value_offs); |
1288 | if (offs < *min_offs) | |
1289 | *min_offs = offs; | |
1290 | } | |
7b1b2c1b TT |
1291 | if (total) |
1292 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
1293 | } |
1294 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
1295 | } | |
1296 | ||
e50e5129 AD |
1297 | /* |
1298 | * Write the value of the EA in an inode. | |
1299 | */ | |
1300 | static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, | |
1301 | const void *buf, int bufsize) | |
1302 | { | |
1303 | struct buffer_head *bh = NULL; | |
1304 | unsigned long block = 0; | |
dec214d0 TE |
1305 | int blocksize = ea_inode->i_sb->s_blocksize; |
1306 | int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; | |
e50e5129 AD |
1307 | int csize, wsize = 0; |
1308 | int ret = 0; | |
1309 | int retries = 0; | |
1310 | ||
1311 | retry: | |
1312 | while (ret >= 0 && ret < max_blocks) { | |
1313 | struct ext4_map_blocks map; | |
1314 | map.m_lblk = block += ret; | |
1315 | map.m_len = max_blocks -= ret; | |
1316 | ||
1317 | ret = ext4_map_blocks(handle, ea_inode, &map, | |
1318 | EXT4_GET_BLOCKS_CREATE); | |
1319 | if (ret <= 0) { | |
1320 | ext4_mark_inode_dirty(handle, ea_inode); | |
1321 | if (ret == -ENOSPC && | |
1322 | ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { | |
1323 | ret = 0; | |
1324 | goto retry; | |
1325 | } | |
1326 | break; | |
1327 | } | |
1328 | } | |
1329 | ||
1330 | if (ret < 0) | |
1331 | return ret; | |
1332 | ||
1333 | block = 0; | |
1334 | while (wsize < bufsize) { | |
1335 | if (bh != NULL) | |
1336 | brelse(bh); | |
1337 | csize = (bufsize - wsize) > blocksize ? blocksize : | |
1338 | bufsize - wsize; | |
1339 | bh = ext4_getblk(handle, ea_inode, block, 0); | |
1340 | if (IS_ERR(bh)) | |
1341 | return PTR_ERR(bh); | |
1342 | ret = ext4_journal_get_write_access(handle, bh); | |
1343 | if (ret) | |
1344 | goto out; | |
1345 | ||
1346 | memcpy(bh->b_data, buf, csize); | |
1347 | set_buffer_uptodate(bh); | |
1348 | ext4_handle_dirty_metadata(handle, ea_inode, bh); | |
1349 | ||
1350 | buf += csize; | |
1351 | wsize += csize; | |
1352 | block += 1; | |
1353 | } | |
1354 | ||
1355 | inode_lock(ea_inode); | |
1356 | i_size_write(ea_inode, wsize); | |
1357 | ext4_update_i_disksize(ea_inode, wsize); | |
1358 | inode_unlock(ea_inode); | |
1359 | ||
1360 | ext4_mark_inode_dirty(handle, ea_inode); | |
1361 | ||
1362 | out: | |
1363 | brelse(bh); | |
1364 | ||
1365 | return ret; | |
1366 | } | |
1367 | ||
1368 | /* | |
1369 | * Create an inode to store the value of a large EA. | |
1370 | */ | |
1371 | static struct inode *ext4_xattr_inode_create(handle_t *handle, | |
dec214d0 | 1372 | struct inode *inode, u32 hash) |
e50e5129 AD |
1373 | { |
1374 | struct inode *ea_inode = NULL; | |
9e1ba001 | 1375 | uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; |
bd3b963b | 1376 | int err; |
e50e5129 AD |
1377 | |
1378 | /* | |
1379 | * Let the next inode be the goal, so we try and allocate the EA inode | |
1380 | * in the same group, or nearby one. | |
1381 | */ | |
1382 | ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, | |
9e1ba001 | 1383 | S_IFREG | 0600, NULL, inode->i_ino + 1, owner, |
1b917ed8 | 1384 | EXT4_EA_INODE_FL); |
e50e5129 AD |
1385 | if (!IS_ERR(ea_inode)) { |
1386 | ea_inode->i_op = &ext4_file_inode_operations; | |
1387 | ea_inode->i_fop = &ext4_file_operations; | |
1388 | ext4_set_aops(ea_inode); | |
33d201e0 | 1389 | ext4_xattr_inode_set_class(ea_inode); |
e50e5129 | 1390 | unlock_new_inode(ea_inode); |
dec214d0 TE |
1391 | ext4_xattr_inode_set_ref(ea_inode, 1); |
1392 | ext4_xattr_inode_set_hash(ea_inode, hash); | |
1393 | err = ext4_mark_inode_dirty(handle, ea_inode); | |
1394 | if (!err) | |
1395 | err = ext4_inode_attach_jinode(ea_inode); | |
bd3b963b TE |
1396 | if (err) { |
1397 | iput(ea_inode); | |
1398 | return ERR_PTR(err); | |
1399 | } | |
dec214d0 TE |
1400 | |
1401 | /* | |
1402 | * Xattr inodes are shared therefore quota charging is performed | |
1403 | * at a higher level. | |
1404 | */ | |
1405 | dquot_free_inode(ea_inode); | |
1406 | dquot_drop(ea_inode); | |
1407 | inode_lock(ea_inode); | |
1408 | ea_inode->i_flags |= S_NOQUOTA; | |
1409 | inode_unlock(ea_inode); | |
e50e5129 AD |
1410 | } |
1411 | ||
1412 | return ea_inode; | |
1413 | } | |
1414 | ||
dec214d0 TE |
1415 | static struct inode * |
1416 | ext4_xattr_inode_cache_find(struct inode *inode, const void *value, | |
1417 | size_t value_len, u32 hash) | |
e50e5129 | 1418 | { |
dec214d0 TE |
1419 | struct inode *ea_inode; |
1420 | struct mb_cache_entry *ce; | |
1421 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); | |
1422 | void *ea_data; | |
1423 | ||
cdb7ee4c TE |
1424 | if (!ea_inode_cache) |
1425 | return NULL; | |
1426 | ||
dec214d0 TE |
1427 | ce = mb_cache_entry_find_first(ea_inode_cache, hash); |
1428 | if (!ce) | |
1429 | return NULL; | |
1430 | ||
1431 | ea_data = ext4_kvmalloc(value_len, GFP_NOFS); | |
1432 | if (!ea_data) { | |
1433 | mb_cache_entry_put(ea_inode_cache, ce); | |
1434 | return NULL; | |
1435 | } | |
e50e5129 | 1436 | |
dec214d0 TE |
1437 | while (ce) { |
1438 | ea_inode = ext4_iget(inode->i_sb, ce->e_value); | |
1439 | if (!IS_ERR(ea_inode) && | |
1440 | !is_bad_inode(ea_inode) && | |
1441 | (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && | |
1442 | i_size_read(ea_inode) == value_len && | |
1443 | !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && | |
b9fc761e TE |
1444 | !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, |
1445 | value_len) && | |
dec214d0 TE |
1446 | !memcmp(value, ea_data, value_len)) { |
1447 | mb_cache_entry_touch(ea_inode_cache, ce); | |
1448 | mb_cache_entry_put(ea_inode_cache, ce); | |
1449 | kvfree(ea_data); | |
1450 | return ea_inode; | |
1451 | } | |
e50e5129 | 1452 | |
dec214d0 TE |
1453 | if (!IS_ERR(ea_inode)) |
1454 | iput(ea_inode); | |
1455 | ce = mb_cache_entry_find_next(ea_inode_cache, ce); | |
1456 | } | |
1457 | kvfree(ea_data); | |
1458 | return NULL; | |
e50e5129 AD |
1459 | } |
1460 | ||
1461 | /* | |
1462 | * Add value of the EA in an inode. | |
1463 | */ | |
dec214d0 TE |
1464 | static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, |
1465 | const void *value, size_t value_len, | |
1466 | struct inode **ret_inode) | |
e50e5129 AD |
1467 | { |
1468 | struct inode *ea_inode; | |
dec214d0 | 1469 | u32 hash; |
e50e5129 AD |
1470 | int err; |
1471 | ||
dec214d0 TE |
1472 | hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); |
1473 | ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); | |
1474 | if (ea_inode) { | |
1475 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1476 | if (err) { | |
1477 | iput(ea_inode); | |
1478 | return err; | |
1479 | } | |
1480 | ||
1481 | *ret_inode = ea_inode; | |
1482 | return 0; | |
1483 | } | |
1484 | ||
e50e5129 | 1485 | /* Create an inode for the EA value */ |
dec214d0 | 1486 | ea_inode = ext4_xattr_inode_create(handle, inode, hash); |
e50e5129 AD |
1487 | if (IS_ERR(ea_inode)) |
1488 | return PTR_ERR(ea_inode); | |
1489 | ||
1490 | err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); | |
dec214d0 TE |
1491 | if (err) { |
1492 | ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1493 | iput(ea_inode); | |
1494 | return err; | |
1495 | } | |
e50e5129 | 1496 | |
cdb7ee4c TE |
1497 | if (EA_INODE_CACHE(inode)) |
1498 | mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, | |
1499 | ea_inode->i_ino, true /* reusable */); | |
e50e5129 | 1500 | |
dec214d0 TE |
1501 | *ret_inode = ea_inode; |
1502 | return 0; | |
e50e5129 AD |
1503 | } |
1504 | ||
9c6e7853 TE |
1505 | /* |
1506 | * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode | |
1507 | * feature is enabled. | |
1508 | */ | |
1509 | #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) | |
1510 | ||
e50e5129 AD |
1511 | static int ext4_xattr_set_entry(struct ext4_xattr_info *i, |
1512 | struct ext4_xattr_search *s, | |
daf83281 TE |
1513 | handle_t *handle, struct inode *inode, |
1514 | bool is_block) | |
ac27a0ec | 1515 | { |
617ba13b | 1516 | struct ext4_xattr_entry *last; |
dec214d0 TE |
1517 | struct ext4_xattr_entry *here = s->here; |
1518 | size_t min_offs = s->end - s->base, name_len = strlen(i->name); | |
e50e5129 | 1519 | int in_inode = i->in_inode; |
dec214d0 TE |
1520 | struct inode *old_ea_inode = NULL; |
1521 | struct inode *new_ea_inode = NULL; | |
1522 | size_t old_size, new_size; | |
1523 | int ret; | |
1524 | ||
1525 | /* Space used by old and new values. */ | |
1526 | old_size = (!s->not_found && !here->e_value_inum) ? | |
1527 | EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; | |
1528 | new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; | |
1529 | ||
1530 | /* | |
1531 | * Optimization for the simple case when old and new values have the | |
1532 | * same padded sizes. Not applicable if external inodes are involved. | |
1533 | */ | |
1534 | if (new_size && new_size == old_size) { | |
1535 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1536 | void *val = s->base + offs; | |
1537 | ||
1538 | here->e_value_size = cpu_to_le32(i->value_len); | |
1539 | if (i->value == EXT4_ZERO_XATTR_VALUE) { | |
1540 | memset(val, 0, new_size); | |
1541 | } else { | |
1542 | memcpy(val, i->value, i->value_len); | |
1543 | /* Clear padding bytes. */ | |
1544 | memset(val + i->value_len, 0, new_size - i->value_len); | |
1545 | } | |
32aaf194 | 1546 | goto update_hash; |
dec214d0 | 1547 | } |
e50e5129 | 1548 | |
ac27a0ec DK |
1549 | /* Compute min_offs and last. */ |
1550 | last = s->first; | |
617ba13b | 1551 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
e50e5129 | 1552 | if (!last->e_value_inum && last->e_value_size) { |
ac27a0ec DK |
1553 | size_t offs = le16_to_cpu(last->e_value_offs); |
1554 | if (offs < min_offs) | |
1555 | min_offs = offs; | |
1556 | } | |
1557 | } | |
dec214d0 TE |
1558 | |
1559 | /* Check whether we have enough space. */ | |
ac27a0ec | 1560 | if (i->value) { |
dec214d0 | 1561 | size_t free; |
e50e5129 | 1562 | |
dec214d0 TE |
1563 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); |
1564 | if (!s->not_found) | |
1565 | free += EXT4_XATTR_LEN(name_len) + old_size; | |
e50e5129 | 1566 | |
dec214d0 TE |
1567 | if (free < EXT4_XATTR_LEN(name_len) + new_size) { |
1568 | ret = -ENOSPC; | |
1569 | goto out; | |
1570 | } | |
9c6e7853 TE |
1571 | |
1572 | /* | |
1573 | * If storing the value in an external inode is an option, | |
1574 | * reserve space for xattr entries/names in the external | |
1575 | * attribute block so that a long value does not occupy the | |
1576 | * whole space and prevent futher entries being added. | |
1577 | */ | |
daf83281 TE |
1578 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
1579 | new_size && is_block && | |
9c6e7853 TE |
1580 | (min_offs + old_size - new_size) < |
1581 | EXT4_XATTR_BLOCK_RESERVE(inode)) { | |
1582 | ret = -ENOSPC; | |
1583 | goto out; | |
1584 | } | |
ac27a0ec DK |
1585 | } |
1586 | ||
dec214d0 TE |
1587 | /* |
1588 | * Getting access to old and new ea inodes is subject to failures. | |
1589 | * Finish that work before doing any modifications to the xattr data. | |
1590 | */ | |
1591 | if (!s->not_found && here->e_value_inum) { | |
1592 | ret = ext4_xattr_inode_iget(inode, | |
1593 | le32_to_cpu(here->e_value_inum), | |
1594 | &old_ea_inode); | |
1595 | if (ret) { | |
1596 | old_ea_inode = NULL; | |
1597 | goto out; | |
1598 | } | |
1599 | } | |
1600 | if (i->value && in_inode) { | |
1601 | WARN_ON_ONCE(!i->value_len); | |
ac27a0ec | 1602 | |
dec214d0 TE |
1603 | ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); |
1604 | if (ret) | |
1605 | goto out; | |
1606 | ||
1607 | ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, | |
1608 | i->value_len, | |
1609 | &new_ea_inode); | |
1610 | if (ret) { | |
1611 | new_ea_inode = NULL; | |
1612 | ext4_xattr_inode_free_quota(inode, i->value_len); | |
1613 | goto out; | |
ac27a0ec | 1614 | } |
dec214d0 TE |
1615 | } |
1616 | ||
1617 | if (old_ea_inode) { | |
1618 | /* We are ready to release ref count on the old_ea_inode. */ | |
1619 | ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); | |
1620 | if (ret) { | |
1621 | /* Release newly required ref count on new_ea_inode. */ | |
1622 | if (new_ea_inode) { | |
1623 | int err; | |
1624 | ||
1625 | err = ext4_xattr_inode_dec_ref(handle, | |
1626 | new_ea_inode); | |
1627 | if (err) | |
1628 | ext4_warning_inode(new_ea_inode, | |
1629 | "dec ref new_ea_inode err=%d", | |
1630 | err); | |
1631 | ext4_xattr_inode_free_quota(inode, | |
1632 | i->value_len); | |
1633 | } | |
1634 | goto out; | |
e50e5129 | 1635 | } |
dec214d0 TE |
1636 | |
1637 | ext4_xattr_inode_free_quota(inode, | |
1638 | le32_to_cpu(here->e_value_size)); | |
1639 | } | |
1640 | ||
1641 | /* No failures allowed past this point. */ | |
1642 | ||
1643 | if (!s->not_found && here->e_value_offs) { | |
1644 | /* Remove the old value. */ | |
1645 | void *first_val = s->base + min_offs; | |
1646 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1647 | void *val = s->base + offs; | |
1648 | ||
1649 | memmove(first_val + old_size, first_val, val - first_val); | |
1650 | memset(first_val, 0, old_size); | |
1651 | min_offs += old_size; | |
1652 | ||
1653 | /* Adjust all value offsets. */ | |
1654 | last = s->first; | |
1655 | while (!IS_LAST_ENTRY(last)) { | |
1656 | size_t o = le16_to_cpu(last->e_value_offs); | |
1657 | ||
1658 | if (!last->e_value_inum && | |
1659 | last->e_value_size && o < offs) | |
1660 | last->e_value_offs = cpu_to_le16(o + old_size); | |
1661 | last = EXT4_XATTR_NEXT(last); | |
ac27a0ec DK |
1662 | } |
1663 | } | |
1664 | ||
dec214d0 TE |
1665 | if (!i->value) { |
1666 | /* Remove old name. */ | |
1667 | size_t size = EXT4_XATTR_LEN(name_len); | |
1668 | ||
1669 | last = ENTRY((void *)last - size); | |
1670 | memmove(here, (void *)here + size, | |
1671 | (void *)last - (void *)here + sizeof(__u32)); | |
1672 | memset(last, 0, size); | |
1673 | } else if (s->not_found) { | |
1674 | /* Insert new name. */ | |
1675 | size_t size = EXT4_XATTR_LEN(name_len); | |
1676 | size_t rest = (void *)last - (void *)here + sizeof(__u32); | |
1677 | ||
1678 | memmove((void *)here + size, here, rest); | |
1679 | memset(here, 0, size); | |
1680 | here->e_name_index = i->name_index; | |
1681 | here->e_name_len = name_len; | |
1682 | memcpy(here->e_name, i->name, name_len); | |
1683 | } else { | |
1684 | /* This is an update, reset value info. */ | |
1685 | here->e_value_inum = 0; | |
1686 | here->e_value_offs = 0; | |
1687 | here->e_value_size = 0; | |
1688 | } | |
1689 | ||
ac27a0ec | 1690 | if (i->value) { |
dec214d0 | 1691 | /* Insert new value. */ |
e50e5129 | 1692 | if (in_inode) { |
dec214d0 | 1693 | here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); |
e50e5129 | 1694 | } else if (i->value_len) { |
dec214d0 TE |
1695 | void *val = s->base + min_offs - new_size; |
1696 | ||
1697 | here->e_value_offs = cpu_to_le16(min_offs - new_size); | |
bd9926e8 | 1698 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
dec214d0 | 1699 | memset(val, 0, new_size); |
bd9926e8 | 1700 | } else { |
bd9926e8 | 1701 | memcpy(val, i->value, i->value_len); |
dec214d0 TE |
1702 | /* Clear padding bytes. */ |
1703 | memset(val + i->value_len, 0, | |
1704 | new_size - i->value_len); | |
bd9926e8 | 1705 | } |
ac27a0ec | 1706 | } |
dec214d0 | 1707 | here->e_value_size = cpu_to_le32(i->value_len); |
ac27a0ec | 1708 | } |
daf83281 | 1709 | |
32aaf194 | 1710 | update_hash: |
b9fc761e TE |
1711 | if (i->value) { |
1712 | __le32 hash = 0; | |
1713 | ||
1714 | /* Entry hash calculation. */ | |
1715 | if (in_inode) { | |
1716 | __le32 crc32c_hash; | |
1717 | ||
1718 | /* | |
1719 | * Feed crc32c hash instead of the raw value for entry | |
1720 | * hash calculation. This is to avoid walking | |
1721 | * potentially long value buffer again. | |
1722 | */ | |
1723 | crc32c_hash = cpu_to_le32( | |
1724 | ext4_xattr_inode_get_hash(new_ea_inode)); | |
1725 | hash = ext4_xattr_hash_entry(here->e_name, | |
1726 | here->e_name_len, | |
1727 | &crc32c_hash, 1); | |
1728 | } else if (is_block) { | |
32aaf194 TE |
1729 | __le32 *value = s->base + le16_to_cpu( |
1730 | here->e_value_offs); | |
b9fc761e TE |
1731 | |
1732 | hash = ext4_xattr_hash_entry(here->e_name, | |
1733 | here->e_name_len, value, | |
1734 | new_size >> 2); | |
1735 | } | |
1736 | here->e_hash = hash; | |
daf83281 TE |
1737 | } |
1738 | ||
b9fc761e TE |
1739 | if (is_block) |
1740 | ext4_xattr_rehash((struct ext4_xattr_header *)s->base); | |
1741 | ||
dec214d0 | 1742 | ret = 0; |
e50e5129 | 1743 | out: |
dec214d0 TE |
1744 | iput(old_ea_inode); |
1745 | iput(new_ea_inode); | |
1746 | return ret; | |
ac27a0ec DK |
1747 | } |
1748 | ||
617ba13b MC |
1749 | struct ext4_xattr_block_find { |
1750 | struct ext4_xattr_search s; | |
ac27a0ec DK |
1751 | struct buffer_head *bh; |
1752 | }; | |
1753 | ||
1754 | static int | |
617ba13b MC |
1755 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
1756 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1757 | { |
1758 | struct super_block *sb = inode->i_sb; | |
1759 | int error; | |
1760 | ||
1761 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
1762 | i->name_index, i->name, i->value, (long)i->value_len); | |
1763 | ||
617ba13b | 1764 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 1765 | /* The inode already has an extended attribute block. */ |
617ba13b | 1766 | bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
1767 | error = -EIO; |
1768 | if (!bs->bh) | |
1769 | goto cleanup; | |
1770 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", | |
1771 | atomic_read(&(bs->bh->b_count)), | |
1772 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
cc8e94fd | 1773 | if (ext4_xattr_check_block(inode, bs->bh)) { |
24676da4 TT |
1774 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1775 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 1776 | error = -EFSCORRUPTED; |
ac27a0ec DK |
1777 | goto cleanup; |
1778 | } | |
1779 | /* Find the named attribute. */ | |
1780 | bs->s.base = BHDR(bs->bh); | |
1781 | bs->s.first = BFIRST(bs->bh); | |
1782 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
1783 | bs->s.here = bs->s.first; | |
617ba13b | 1784 | error = ext4_xattr_find_entry(&bs->s.here, i->name_index, |
6ba644b9 | 1785 | i->name, 1); |
ac27a0ec DK |
1786 | if (error && error != -ENODATA) |
1787 | goto cleanup; | |
1788 | bs->s.not_found = error; | |
1789 | } | |
1790 | error = 0; | |
1791 | ||
1792 | cleanup: | |
1793 | return error; | |
1794 | } | |
1795 | ||
1796 | static int | |
617ba13b MC |
1797 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
1798 | struct ext4_xattr_info *i, | |
1799 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1800 | { |
1801 | struct super_block *sb = inode->i_sb; | |
1802 | struct buffer_head *new_bh = NULL; | |
b347e2bc TE |
1803 | struct ext4_xattr_search s_copy = bs->s; |
1804 | struct ext4_xattr_search *s = &s_copy; | |
7a2508e1 | 1805 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 1806 | int error = 0; |
47387409 | 1807 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
dec214d0 TE |
1808 | struct inode *ea_inode = NULL; |
1809 | size_t old_ea_inode_size = 0; | |
ac27a0ec | 1810 | |
617ba13b | 1811 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec | 1812 | |
ac27a0ec | 1813 | if (s->base) { |
5d601255 | 1814 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
1815 | error = ext4_journal_get_write_access(handle, bs->bh); |
1816 | if (error) | |
1817 | goto cleanup; | |
1818 | lock_buffer(bs->bh); | |
1819 | ||
ac27a0ec | 1820 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
1821 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
1822 | ||
1823 | /* | |
1824 | * This must happen under buffer lock for | |
1825 | * ext4_xattr_block_set() to reliably detect modified | |
1826 | * block | |
1827 | */ | |
cdb7ee4c TE |
1828 | if (ea_block_cache) |
1829 | mb_cache_entry_delete(ea_block_cache, hash, | |
1830 | bs->bh->b_blocknr); | |
ac27a0ec | 1831 | ea_bdebug(bs->bh, "modifying in-place"); |
daf83281 TE |
1832 | error = ext4_xattr_set_entry(i, s, handle, inode, |
1833 | true /* is_block */); | |
dac7a4b4 | 1834 | ext4_xattr_block_csum_set(inode, bs->bh); |
ac27a0ec | 1835 | unlock_buffer(bs->bh); |
6a797d27 | 1836 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1837 | goto bad_block; |
1838 | if (!error) | |
dac7a4b4 TT |
1839 | error = ext4_handle_dirty_metadata(handle, |
1840 | inode, | |
1841 | bs->bh); | |
ac27a0ec DK |
1842 | if (error) |
1843 | goto cleanup; | |
1844 | goto inserted; | |
1845 | } else { | |
1846 | int offset = (char *)s->here - bs->bh->b_data; | |
1847 | ||
8a2bfdcb | 1848 | unlock_buffer(bs->bh); |
ac27a0ec | 1849 | ea_bdebug(bs->bh, "cloning"); |
216553c4 | 1850 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
1851 | error = -ENOMEM; |
1852 | if (s->base == NULL) | |
1853 | goto cleanup; | |
1854 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
1855 | s->first = ENTRY(header(s->base)+1); | |
1856 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1857 | s->here = ENTRY(s->base + offset); | |
1858 | s->end = s->base + bs->bh->b_size; | |
dec214d0 TE |
1859 | |
1860 | /* | |
1861 | * If existing entry points to an xattr inode, we need | |
1862 | * to prevent ext4_xattr_set_entry() from decrementing | |
1863 | * ref count on it because the reference belongs to the | |
1864 | * original block. In this case, make the entry look | |
1865 | * like it has an empty value. | |
1866 | */ | |
1867 | if (!s->not_found && s->here->e_value_inum) { | |
1868 | /* | |
1869 | * Defer quota free call for previous inode | |
1870 | * until success is guaranteed. | |
1871 | */ | |
1872 | old_ea_inode_size = le32_to_cpu( | |
1873 | s->here->e_value_size); | |
1874 | s->here->e_value_inum = 0; | |
1875 | s->here->e_value_size = 0; | |
1876 | } | |
ac27a0ec DK |
1877 | } |
1878 | } else { | |
1879 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 1880 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
1881 | /* assert(header == s->base) */ |
1882 | error = -ENOMEM; | |
1883 | if (s->base == NULL) | |
1884 | goto cleanup; | |
617ba13b | 1885 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
1886 | header(s->base)->h_blocks = cpu_to_le32(1); |
1887 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1888 | s->first = ENTRY(header(s->base)+1); | |
1889 | s->here = ENTRY(header(s->base)+1); | |
1890 | s->end = s->base + sb->s_blocksize; | |
1891 | } | |
1892 | ||
daf83281 | 1893 | error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); |
6a797d27 | 1894 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1895 | goto bad_block; |
1896 | if (error) | |
1897 | goto cleanup; | |
dec214d0 TE |
1898 | |
1899 | if (i->value && s->here->e_value_inum) { | |
1900 | unsigned int ea_ino; | |
1901 | ||
1902 | /* | |
1903 | * A ref count on ea_inode has been taken as part of the call to | |
1904 | * ext4_xattr_set_entry() above. We would like to drop this | |
1905 | * extra ref but we have to wait until the xattr block is | |
1906 | * initialized and has its own ref count on the ea_inode. | |
1907 | */ | |
1908 | ea_ino = le32_to_cpu(s->here->e_value_inum); | |
1909 | error = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); | |
1910 | if (error) { | |
1911 | ea_inode = NULL; | |
1912 | goto cleanup; | |
1913 | } | |
1914 | } | |
1915 | ||
ac27a0ec DK |
1916 | inserted: |
1917 | if (!IS_LAST_ENTRY(s->first)) { | |
47387409 TE |
1918 | new_bh = ext4_xattr_block_cache_find(inode, header(s->base), |
1919 | &ce); | |
ac27a0ec DK |
1920 | if (new_bh) { |
1921 | /* We found an identical block in the cache. */ | |
1922 | if (new_bh == bs->bh) | |
1923 | ea_bdebug(new_bh, "keeping"); | |
1924 | else { | |
6048c64b AG |
1925 | u32 ref; |
1926 | ||
b8cb5a54 TE |
1927 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
1928 | ||
ac27a0ec DK |
1929 | /* The old block is released after updating |
1930 | the inode. */ | |
1231b3a1 LC |
1931 | error = dquot_alloc_block(inode, |
1932 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 1933 | if (error) |
ac27a0ec | 1934 | goto cleanup; |
5d601255 | 1935 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 1936 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
1937 | new_bh); |
1938 | if (error) | |
1939 | goto cleanup_dquot; | |
1940 | lock_buffer(new_bh); | |
82939d79 JK |
1941 | /* |
1942 | * We have to be careful about races with | |
6048c64b AG |
1943 | * freeing, rehashing or adding references to |
1944 | * xattr block. Once we hold buffer lock xattr | |
1945 | * block's state is stable so we can check | |
1946 | * whether the block got freed / rehashed or | |
1947 | * not. Since we unhash mbcache entry under | |
1948 | * buffer lock when freeing / rehashing xattr | |
1949 | * block, checking whether entry is still | |
1950 | * hashed is reliable. Same rules hold for | |
1951 | * e_reusable handling. | |
82939d79 | 1952 | */ |
6048c64b AG |
1953 | if (hlist_bl_unhashed(&ce->e_hash_list) || |
1954 | !ce->e_reusable) { | |
82939d79 JK |
1955 | /* |
1956 | * Undo everything and check mbcache | |
1957 | * again. | |
1958 | */ | |
1959 | unlock_buffer(new_bh); | |
1960 | dquot_free_block(inode, | |
1961 | EXT4_C2B(EXT4_SB(sb), | |
1962 | 1)); | |
1963 | brelse(new_bh); | |
47387409 | 1964 | mb_cache_entry_put(ea_block_cache, ce); |
82939d79 JK |
1965 | ce = NULL; |
1966 | new_bh = NULL; | |
1967 | goto inserted; | |
1968 | } | |
6048c64b AG |
1969 | ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
1970 | BHDR(new_bh)->h_refcount = cpu_to_le32(ref); | |
1971 | if (ref >= EXT4_XATTR_REFCOUNT_MAX) | |
1972 | ce->e_reusable = 0; | |
ac27a0ec | 1973 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
6048c64b | 1974 | ref); |
dac7a4b4 | 1975 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec | 1976 | unlock_buffer(new_bh); |
dac7a4b4 TT |
1977 | error = ext4_handle_dirty_metadata(handle, |
1978 | inode, | |
1979 | new_bh); | |
ac27a0ec DK |
1980 | if (error) |
1981 | goto cleanup_dquot; | |
1982 | } | |
47387409 TE |
1983 | mb_cache_entry_touch(ea_block_cache, ce); |
1984 | mb_cache_entry_put(ea_block_cache, ce); | |
ac27a0ec DK |
1985 | ce = NULL; |
1986 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
1987 | /* We were modifying this block in-place. */ | |
1988 | ea_bdebug(bs->bh, "keeping this block"); | |
ec000220 | 1989 | ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); |
ac27a0ec DK |
1990 | new_bh = bs->bh; |
1991 | get_bh(new_bh); | |
1992 | } else { | |
1993 | /* We need to allocate a new block */ | |
fb0a387d ES |
1994 | ext4_fsblk_t goal, block; |
1995 | ||
b8cb5a54 TE |
1996 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
1997 | ||
fb0a387d | 1998 | goal = ext4_group_first_block_no(sb, |
d00a6d7b | 1999 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
2000 | |
2001 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 2002 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2003 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
2004 | ||
55f020db AH |
2005 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
2006 | NULL, &error); | |
ac27a0ec DK |
2007 | if (error) |
2008 | goto cleanup; | |
fb0a387d | 2009 | |
12e9b892 | 2010 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2011 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
2012 | ||
ace36ad4 JP |
2013 | ea_idebug(inode, "creating block %llu", |
2014 | (unsigned long long)block); | |
ac27a0ec DK |
2015 | |
2016 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 2017 | if (unlikely(!new_bh)) { |
860d21e2 | 2018 | error = -ENOMEM; |
ac27a0ec | 2019 | getblk_failed: |
7dc57615 | 2020 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 2021 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
2022 | goto cleanup; |
2023 | } | |
dec214d0 TE |
2024 | error = ext4_xattr_inode_inc_ref_all(handle, inode, |
2025 | ENTRY(header(s->base)+1)); | |
2026 | if (error) | |
2027 | goto getblk_failed; | |
2028 | if (ea_inode) { | |
2029 | /* Drop the extra ref on ea_inode. */ | |
2030 | error = ext4_xattr_inode_dec_ref(handle, | |
2031 | ea_inode); | |
2032 | if (error) | |
2033 | ext4_warning_inode(ea_inode, | |
2034 | "dec ref error=%d", | |
2035 | error); | |
2036 | iput(ea_inode); | |
2037 | ea_inode = NULL; | |
2038 | } | |
2039 | ||
ac27a0ec | 2040 | lock_buffer(new_bh); |
617ba13b | 2041 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
2042 | if (error) { |
2043 | unlock_buffer(new_bh); | |
860d21e2 | 2044 | error = -EIO; |
ac27a0ec DK |
2045 | goto getblk_failed; |
2046 | } | |
2047 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
dac7a4b4 | 2048 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec DK |
2049 | set_buffer_uptodate(new_bh); |
2050 | unlock_buffer(new_bh); | |
47387409 | 2051 | ext4_xattr_block_cache_insert(ea_block_cache, new_bh); |
dac7a4b4 TT |
2052 | error = ext4_handle_dirty_metadata(handle, inode, |
2053 | new_bh); | |
ac27a0ec DK |
2054 | if (error) |
2055 | goto cleanup; | |
2056 | } | |
2057 | } | |
2058 | ||
dec214d0 TE |
2059 | if (old_ea_inode_size) |
2060 | ext4_xattr_inode_free_quota(inode, old_ea_inode_size); | |
2061 | ||
ac27a0ec | 2062 | /* Update the inode. */ |
617ba13b | 2063 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
2064 | |
2065 | /* Drop the previous xattr block. */ | |
dec214d0 TE |
2066 | if (bs->bh && bs->bh != new_bh) { |
2067 | struct ext4_xattr_inode_array *ea_inode_array = NULL; | |
2068 | ||
2069 | ext4_xattr_release_block(handle, inode, bs->bh, | |
2070 | &ea_inode_array, | |
2071 | 0 /* extra_credits */); | |
2072 | ext4_xattr_inode_array_free(ea_inode_array); | |
2073 | } | |
ac27a0ec DK |
2074 | error = 0; |
2075 | ||
2076 | cleanup: | |
dec214d0 TE |
2077 | if (ea_inode) { |
2078 | int error2; | |
2079 | ||
2080 | error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
2081 | if (error2) | |
2082 | ext4_warning_inode(ea_inode, "dec ref error=%d", | |
2083 | error2); | |
2084 | ||
2085 | /* If there was an error, revert the quota charge. */ | |
2086 | if (error) | |
2087 | ext4_xattr_inode_free_quota(inode, | |
2088 | i_size_read(ea_inode)); | |
2089 | iput(ea_inode); | |
2090 | } | |
ac27a0ec | 2091 | if (ce) |
47387409 | 2092 | mb_cache_entry_put(ea_block_cache, ce); |
ac27a0ec DK |
2093 | brelse(new_bh); |
2094 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
2095 | kfree(s->base); | |
2096 | ||
2097 | return error; | |
2098 | ||
2099 | cleanup_dquot: | |
1231b3a1 | 2100 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
2101 | goto cleanup; |
2102 | ||
2103 | bad_block: | |
24676da4 TT |
2104 | EXT4_ERROR_INODE(inode, "bad block %llu", |
2105 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
2106 | goto cleanup; |
2107 | ||
2108 | #undef header | |
2109 | } | |
2110 | ||
879b3825 TM |
2111 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
2112 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2113 | { |
617ba13b MC |
2114 | struct ext4_xattr_ibody_header *header; |
2115 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
2116 | int error; |
2117 | ||
617ba13b | 2118 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 2119 | return 0; |
617ba13b | 2120 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
2121 | header = IHDR(inode, raw_inode); |
2122 | is->s.base = is->s.first = IFIRST(header); | |
2123 | is->s.here = is->s.first; | |
617ba13b | 2124 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 2125 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
9e92f48c | 2126 | error = xattr_check_inode(inode, header, is->s.end); |
ac27a0ec DK |
2127 | if (error) |
2128 | return error; | |
2129 | /* Find the named attribute. */ | |
617ba13b | 2130 | error = ext4_xattr_find_entry(&is->s.here, i->name_index, |
6ba644b9 | 2131 | i->name, 0); |
ac27a0ec DK |
2132 | if (error && error != -ENODATA) |
2133 | return error; | |
2134 | is->s.not_found = error; | |
2135 | } | |
2136 | return 0; | |
2137 | } | |
2138 | ||
0d812f77 TM |
2139 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
2140 | struct ext4_xattr_info *i, | |
2141 | struct ext4_xattr_ibody_find *is) | |
2142 | { | |
2143 | struct ext4_xattr_ibody_header *header; | |
2144 | struct ext4_xattr_search *s = &is->s; | |
2145 | int error; | |
2146 | ||
2147 | if (EXT4_I(inode)->i_extra_isize == 0) | |
2148 | return -ENOSPC; | |
daf83281 | 2149 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
0d812f77 TM |
2150 | if (error) { |
2151 | if (error == -ENOSPC && | |
2152 | ext4_has_inline_data(inode)) { | |
2153 | error = ext4_try_to_evict_inline_data(handle, inode, | |
2154 | EXT4_XATTR_LEN(strlen(i->name) + | |
2155 | EXT4_XATTR_SIZE(i->value_len))); | |
2156 | if (error) | |
2157 | return error; | |
2158 | error = ext4_xattr_ibody_find(inode, i, is); | |
2159 | if (error) | |
2160 | return error; | |
daf83281 TE |
2161 | error = ext4_xattr_set_entry(i, s, handle, inode, |
2162 | false /* is_block */); | |
0d812f77 TM |
2163 | } |
2164 | if (error) | |
2165 | return error; | |
2166 | } | |
2167 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); | |
2168 | if (!IS_LAST_ENTRY(s->first)) { | |
2169 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
2170 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
2171 | } else { | |
2172 | header->h_magic = cpu_to_le32(0); | |
2173 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
2174 | } | |
2175 | return 0; | |
2176 | } | |
2177 | ||
e50e5129 | 2178 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, |
0d812f77 TM |
2179 | struct ext4_xattr_info *i, |
2180 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2181 | { |
617ba13b MC |
2182 | struct ext4_xattr_ibody_header *header; |
2183 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
2184 | int error; |
2185 | ||
617ba13b | 2186 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 2187 | return -ENOSPC; |
daf83281 | 2188 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
ac27a0ec DK |
2189 | if (error) |
2190 | return error; | |
617ba13b | 2191 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 2192 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 2193 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 2194 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2195 | } else { |
2196 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 2197 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2198 | } |
2199 | return 0; | |
2200 | } | |
2201 | ||
3fd16462 JK |
2202 | static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
2203 | struct ext4_xattr_info *i) | |
2204 | { | |
2205 | void *value; | |
2206 | ||
0bd454c0 TE |
2207 | /* When e_value_inum is set the value is stored externally. */ |
2208 | if (s->here->e_value_inum) | |
2209 | return 0; | |
3fd16462 JK |
2210 | if (le32_to_cpu(s->here->e_value_size) != i->value_len) |
2211 | return 0; | |
2212 | value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); | |
2213 | return !memcmp(value, i->value, i->value_len); | |
2214 | } | |
2215 | ||
dec214d0 TE |
2216 | static struct buffer_head *ext4_xattr_get_block(struct inode *inode) |
2217 | { | |
2218 | struct buffer_head *bh; | |
2219 | int error; | |
2220 | ||
2221 | if (!EXT4_I(inode)->i_file_acl) | |
2222 | return NULL; | |
2223 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
2224 | if (!bh) | |
2225 | return ERR_PTR(-EIO); | |
2226 | error = ext4_xattr_check_block(inode, bh); | |
2227 | if (error) | |
2228 | return ERR_PTR(error); | |
2229 | return bh; | |
2230 | } | |
2231 | ||
ac27a0ec | 2232 | /* |
617ba13b | 2233 | * ext4_xattr_set_handle() |
ac27a0ec | 2234 | * |
6e9510b0 | 2235 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
2236 | * is NULL to remove an existing extended attribute, and non-NULL to |
2237 | * either replace an existing extended attribute, or create a new extended | |
2238 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
2239 | * specify that an extended attribute must exist and must not exist | |
2240 | * previous to the call, respectively. | |
2241 | * | |
2242 | * Returns 0, or a negative error number on failure. | |
2243 | */ | |
2244 | int | |
617ba13b | 2245 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
2246 | const char *name, const void *value, size_t value_len, |
2247 | int flags) | |
2248 | { | |
617ba13b | 2249 | struct ext4_xattr_info i = { |
ac27a0ec DK |
2250 | .name_index = name_index, |
2251 | .name = name, | |
2252 | .value = value, | |
2253 | .value_len = value_len, | |
e50e5129 | 2254 | .in_inode = 0, |
ac27a0ec | 2255 | }; |
617ba13b | 2256 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
2257 | .s = { .not_found = -ENODATA, }, |
2258 | }; | |
617ba13b | 2259 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
2260 | .s = { .not_found = -ENODATA, }, |
2261 | }; | |
c755e251 | 2262 | int no_expand; |
ac27a0ec DK |
2263 | int error; |
2264 | ||
2265 | if (!name) | |
2266 | return -EINVAL; | |
2267 | if (strlen(name) > 255) | |
2268 | return -ERANGE; | |
b8cb5a54 | 2269 | |
c755e251 | 2270 | ext4_write_lock_xattr(inode, &no_expand); |
4d20c685 | 2271 | |
c1a5d5f6 TE |
2272 | /* Check journal credits under write lock. */ |
2273 | if (ext4_handle_valid(handle)) { | |
dec214d0 | 2274 | struct buffer_head *bh; |
c1a5d5f6 TE |
2275 | int credits; |
2276 | ||
dec214d0 TE |
2277 | bh = ext4_xattr_get_block(inode); |
2278 | if (IS_ERR(bh)) { | |
2279 | error = PTR_ERR(bh); | |
2280 | goto cleanup; | |
2281 | } | |
2282 | ||
af65207c TE |
2283 | credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2284 | value_len, | |
2285 | flags & XATTR_CREATE); | |
dec214d0 TE |
2286 | brelse(bh); |
2287 | ||
c1a5d5f6 TE |
2288 | if (!ext4_handle_has_enough_credits(handle, credits)) { |
2289 | error = -ENOSPC; | |
2290 | goto cleanup; | |
2291 | } | |
2292 | } | |
2293 | ||
66543617 | 2294 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
2295 | if (error) |
2296 | goto cleanup; | |
2297 | ||
19f5fb7a | 2298 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
2299 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
2300 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 2301 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
2302 | } |
2303 | ||
617ba13b | 2304 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
2305 | if (error) |
2306 | goto cleanup; | |
2307 | if (is.s.not_found) | |
617ba13b | 2308 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
2309 | if (error) |
2310 | goto cleanup; | |
2311 | if (is.s.not_found && bs.s.not_found) { | |
2312 | error = -ENODATA; | |
2313 | if (flags & XATTR_REPLACE) | |
2314 | goto cleanup; | |
2315 | error = 0; | |
2316 | if (!value) | |
2317 | goto cleanup; | |
2318 | } else { | |
2319 | error = -EEXIST; | |
2320 | if (flags & XATTR_CREATE) | |
2321 | goto cleanup; | |
2322 | } | |
dec214d0 | 2323 | |
ac27a0ec DK |
2324 | if (!value) { |
2325 | if (!is.s.not_found) | |
e50e5129 | 2326 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 2327 | else if (!bs.s.not_found) |
617ba13b | 2328 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2329 | } else { |
3fd16462 JK |
2330 | error = 0; |
2331 | /* Xattr value did not change? Save us some work and bail out */ | |
2332 | if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) | |
2333 | goto cleanup; | |
2334 | if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) | |
2335 | goto cleanup; | |
2336 | ||
b347e2bc TE |
2337 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2338 | (EXT4_XATTR_SIZE(i.value_len) > | |
2339 | EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) | |
2340 | i.in_inode = 1; | |
2341 | retry_inode: | |
e50e5129 | 2342 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
2343 | if (!error && !bs.s.not_found) { |
2344 | i.value = NULL; | |
617ba13b | 2345 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2346 | } else if (error == -ENOSPC) { |
7e01c8e5 TY |
2347 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
2348 | error = ext4_xattr_block_find(inode, &i, &bs); | |
2349 | if (error) | |
2350 | goto cleanup; | |
2351 | } | |
617ba13b | 2352 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
b347e2bc | 2353 | if (!error && !is.s.not_found) { |
ac27a0ec | 2354 | i.value = NULL; |
e50e5129 AD |
2355 | error = ext4_xattr_ibody_set(handle, inode, &i, |
2356 | &is); | |
b347e2bc TE |
2357 | } else if (error == -ENOSPC) { |
2358 | /* | |
2359 | * Xattr does not fit in the block, store at | |
2360 | * external inode if possible. | |
2361 | */ | |
2362 | if (ext4_has_feature_ea_inode(inode->i_sb) && | |
2363 | !i.in_inode) { | |
2364 | i.in_inode = 1; | |
2365 | goto retry_inode; | |
2366 | } | |
ac27a0ec DK |
2367 | } |
2368 | } | |
2369 | } | |
2370 | if (!error) { | |
617ba13b | 2371 | ext4_xattr_update_super_block(handle, inode->i_sb); |
eeca7ea1 | 2372 | inode->i_ctime = current_time(inode); |
6dd4ee7c | 2373 | if (!value) |
c755e251 | 2374 | no_expand = 0; |
617ba13b | 2375 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 2376 | /* |
617ba13b | 2377 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
2378 | * error != 0. |
2379 | */ | |
2380 | is.iloc.bh = NULL; | |
2381 | if (IS_SYNC(inode)) | |
0390131b | 2382 | ext4_handle_sync(handle); |
ac27a0ec DK |
2383 | } |
2384 | ||
2385 | cleanup: | |
2386 | brelse(is.iloc.bh); | |
2387 | brelse(bs.bh); | |
c755e251 | 2388 | ext4_write_unlock_xattr(inode, &no_expand); |
ac27a0ec DK |
2389 | return error; |
2390 | } | |
2391 | ||
af65207c TE |
2392 | int ext4_xattr_set_credits(struct inode *inode, size_t value_len, |
2393 | bool is_create, int *credits) | |
c1a5d5f6 | 2394 | { |
dec214d0 TE |
2395 | struct buffer_head *bh; |
2396 | int err; | |
c1a5d5f6 | 2397 | |
dec214d0 | 2398 | *credits = 0; |
c1a5d5f6 | 2399 | |
dec214d0 TE |
2400 | if (!EXT4_SB(inode->i_sb)->s_journal) |
2401 | return 0; | |
c1a5d5f6 | 2402 | |
dec214d0 | 2403 | down_read(&EXT4_I(inode)->xattr_sem); |
c1a5d5f6 | 2404 | |
dec214d0 TE |
2405 | bh = ext4_xattr_get_block(inode); |
2406 | if (IS_ERR(bh)) { | |
2407 | err = PTR_ERR(bh); | |
2408 | } else { | |
af65207c TE |
2409 | *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2410 | value_len, is_create); | |
dec214d0 TE |
2411 | brelse(bh); |
2412 | err = 0; | |
c1a5d5f6 | 2413 | } |
dec214d0 TE |
2414 | |
2415 | up_read(&EXT4_I(inode)->xattr_sem); | |
2416 | return err; | |
c1a5d5f6 TE |
2417 | } |
2418 | ||
ac27a0ec | 2419 | /* |
617ba13b | 2420 | * ext4_xattr_set() |
ac27a0ec | 2421 | * |
617ba13b | 2422 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
2423 | * attribute modification is a filesystem transaction by itself. |
2424 | * | |
2425 | * Returns 0, or a negative error number on failure. | |
2426 | */ | |
2427 | int | |
617ba13b | 2428 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
2429 | const void *value, size_t value_len, int flags) |
2430 | { | |
2431 | handle_t *handle; | |
e50e5129 | 2432 | struct super_block *sb = inode->i_sb; |
ac27a0ec | 2433 | int error, retries = 0; |
c1a5d5f6 | 2434 | int credits; |
ac27a0ec | 2435 | |
b8cb5a54 TE |
2436 | error = dquot_initialize(inode); |
2437 | if (error) | |
2438 | return error; | |
e50e5129 | 2439 | |
ac27a0ec | 2440 | retry: |
af65207c TE |
2441 | error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, |
2442 | &credits); | |
dec214d0 TE |
2443 | if (error) |
2444 | return error; | |
2445 | ||
9924a92a | 2446 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
2447 | if (IS_ERR(handle)) { |
2448 | error = PTR_ERR(handle); | |
2449 | } else { | |
2450 | int error2; | |
2451 | ||
617ba13b | 2452 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 2453 | value, value_len, flags); |
617ba13b | 2454 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 2455 | if (error == -ENOSPC && |
e50e5129 | 2456 | ext4_should_retry_alloc(sb, &retries)) |
ac27a0ec DK |
2457 | goto retry; |
2458 | if (error == 0) | |
2459 | error = error2; | |
2460 | } | |
2461 | ||
2462 | return error; | |
2463 | } | |
2464 | ||
6dd4ee7c KS |
2465 | /* |
2466 | * Shift the EA entries in the inode to create space for the increased | |
2467 | * i_extra_isize. | |
2468 | */ | |
2469 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
2470 | int value_offs_shift, void *to, | |
94405713 | 2471 | void *from, size_t n) |
6dd4ee7c KS |
2472 | { |
2473 | struct ext4_xattr_entry *last = entry; | |
2474 | int new_offs; | |
2475 | ||
94405713 JK |
2476 | /* We always shift xattr headers further thus offsets get lower */ |
2477 | BUG_ON(value_offs_shift > 0); | |
2478 | ||
6dd4ee7c KS |
2479 | /* Adjust the value offsets of the entries */ |
2480 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 2481 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
2482 | new_offs = le16_to_cpu(last->e_value_offs) + |
2483 | value_offs_shift; | |
6dd4ee7c KS |
2484 | last->e_value_offs = cpu_to_le16(new_offs); |
2485 | } | |
2486 | } | |
2487 | /* Shift the entries by n bytes */ | |
2488 | memmove(to, from, n); | |
2489 | } | |
2490 | ||
3f2571c1 JK |
2491 | /* |
2492 | * Move xattr pointed to by 'entry' from inode into external xattr block | |
2493 | */ | |
2494 | static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, | |
2495 | struct ext4_inode *raw_inode, | |
2496 | struct ext4_xattr_entry *entry) | |
2497 | { | |
2498 | struct ext4_xattr_ibody_find *is = NULL; | |
2499 | struct ext4_xattr_block_find *bs = NULL; | |
2500 | char *buffer = NULL, *b_entry_name = NULL; | |
f6109100 | 2501 | size_t value_size = le32_to_cpu(entry->e_value_size); |
3f2571c1 JK |
2502 | struct ext4_xattr_info i = { |
2503 | .value = NULL, | |
2504 | .value_len = 0, | |
2505 | .name_index = entry->e_name_index, | |
f6109100 | 2506 | .in_inode = !!entry->e_value_inum, |
3f2571c1 JK |
2507 | }; |
2508 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2509 | int error; | |
2510 | ||
3f2571c1 JK |
2511 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); |
2512 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
2513 | buffer = kmalloc(value_size, GFP_NOFS); | |
2514 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
2515 | if (!is || !bs || !buffer || !b_entry_name) { | |
2516 | error = -ENOMEM; | |
2517 | goto out; | |
2518 | } | |
2519 | ||
2520 | is->s.not_found = -ENODATA; | |
2521 | bs->s.not_found = -ENODATA; | |
2522 | is->iloc.bh = NULL; | |
2523 | bs->bh = NULL; | |
2524 | ||
2525 | /* Save the entry name and the entry value */ | |
f6109100 | 2526 | if (entry->e_value_inum) { |
b9fc761e | 2527 | error = ext4_xattr_inode_get(inode, entry, buffer, value_size); |
f6109100 TE |
2528 | if (error) |
2529 | goto out; | |
2530 | } else { | |
2531 | size_t value_offs = le16_to_cpu(entry->e_value_offs); | |
2532 | memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); | |
2533 | } | |
2534 | ||
3f2571c1 JK |
2535 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); |
2536 | b_entry_name[entry->e_name_len] = '\0'; | |
2537 | i.name = b_entry_name; | |
2538 | ||
2539 | error = ext4_get_inode_loc(inode, &is->iloc); | |
2540 | if (error) | |
2541 | goto out; | |
2542 | ||
2543 | error = ext4_xattr_ibody_find(inode, &i, is); | |
2544 | if (error) | |
2545 | goto out; | |
2546 | ||
2547 | /* Remove the chosen entry from the inode */ | |
e50e5129 | 2548 | error = ext4_xattr_ibody_set(handle, inode, &i, is); |
3f2571c1 JK |
2549 | if (error) |
2550 | goto out; | |
2551 | ||
3f2571c1 JK |
2552 | i.value = buffer; |
2553 | i.value_len = value_size; | |
2554 | error = ext4_xattr_block_find(inode, &i, bs); | |
2555 | if (error) | |
2556 | goto out; | |
2557 | ||
2558 | /* Add entry which was removed from the inode into the block */ | |
2559 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
2560 | if (error) | |
2561 | goto out; | |
2562 | error = 0; | |
2563 | out: | |
2564 | kfree(b_entry_name); | |
2565 | kfree(buffer); | |
2566 | if (is) | |
2567 | brelse(is->iloc.bh); | |
2568 | kfree(is); | |
2569 | kfree(bs); | |
2570 | ||
2571 | return error; | |
2572 | } | |
2573 | ||
dfa2064b JK |
2574 | static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, |
2575 | struct ext4_inode *raw_inode, | |
2576 | int isize_diff, size_t ifree, | |
2577 | size_t bfree, int *total_ino) | |
2578 | { | |
2579 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2580 | struct ext4_xattr_entry *small_entry; | |
2581 | struct ext4_xattr_entry *entry; | |
2582 | struct ext4_xattr_entry *last; | |
2583 | unsigned int entry_size; /* EA entry size */ | |
2584 | unsigned int total_size; /* EA entry size + value size */ | |
2585 | unsigned int min_total_size; | |
2586 | int error; | |
2587 | ||
2588 | while (isize_diff > ifree) { | |
2589 | entry = NULL; | |
2590 | small_entry = NULL; | |
2591 | min_total_size = ~0U; | |
2592 | last = IFIRST(header); | |
2593 | /* Find the entry best suited to be pushed into EA block */ | |
2594 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
9bb21ced TE |
2595 | total_size = EXT4_XATTR_LEN(last->e_name_len); |
2596 | if (!last->e_value_inum) | |
2597 | total_size += EXT4_XATTR_SIZE( | |
2598 | le32_to_cpu(last->e_value_size)); | |
dfa2064b JK |
2599 | if (total_size <= bfree && |
2600 | total_size < min_total_size) { | |
2601 | if (total_size + ifree < isize_diff) { | |
2602 | small_entry = last; | |
2603 | } else { | |
2604 | entry = last; | |
2605 | min_total_size = total_size; | |
2606 | } | |
2607 | } | |
2608 | } | |
2609 | ||
2610 | if (entry == NULL) { | |
2611 | if (small_entry == NULL) | |
2612 | return -ENOSPC; | |
2613 | entry = small_entry; | |
2614 | } | |
2615 | ||
2616 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
9bb21ced TE |
2617 | total_size = entry_size; |
2618 | if (!entry->e_value_inum) | |
2619 | total_size += EXT4_XATTR_SIZE( | |
2620 | le32_to_cpu(entry->e_value_size)); | |
dfa2064b JK |
2621 | error = ext4_xattr_move_to_block(handle, inode, raw_inode, |
2622 | entry); | |
2623 | if (error) | |
2624 | return error; | |
2625 | ||
2626 | *total_ino -= entry_size; | |
2627 | ifree += total_size; | |
2628 | bfree -= total_size; | |
2629 | } | |
2630 | ||
2631 | return 0; | |
2632 | } | |
2633 | ||
6dd4ee7c KS |
2634 | /* |
2635 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
2636 | * Returns 0 on success or negative error number on failure. | |
2637 | */ | |
2638 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
2639 | struct ext4_inode *raw_inode, handle_t *handle) | |
2640 | { | |
2641 | struct ext4_xattr_ibody_header *header; | |
b640b2c5 | 2642 | struct buffer_head *bh; |
cf0a5e81 MX |
2643 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
2644 | static unsigned int mnt_count; | |
e3014d14 JK |
2645 | size_t min_offs; |
2646 | size_t ifree, bfree; | |
7b1b2c1b | 2647 | int total_ino; |
6e0cd088 | 2648 | void *base, *end; |
d0141191 | 2649 | int error = 0, tried_min_extra_isize = 0; |
cf0a5e81 | 2650 | int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); |
d0141191 | 2651 | int isize_diff; /* How much do we need to grow i_extra_isize */ |
6dd4ee7c | 2652 | |
6dd4ee7c | 2653 | retry: |
d0141191 | 2654 | isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; |
2e81a4ee | 2655 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) |
b640b2c5 | 2656 | return 0; |
6dd4ee7c KS |
2657 | |
2658 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
2659 | |
2660 | /* | |
2661 | * Check if enough free space is available in the inode to shift the | |
2662 | * entries ahead by new_extra_isize. | |
2663 | */ | |
2664 | ||
6e0cd088 | 2665 | base = IFIRST(header); |
6dd4ee7c KS |
2666 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
2667 | min_offs = end - base; | |
6dd4ee7c KS |
2668 | total_ino = sizeof(struct ext4_xattr_ibody_header); |
2669 | ||
9e92f48c TT |
2670 | error = xattr_check_inode(inode, header, end); |
2671 | if (error) | |
2672 | goto cleanup; | |
2673 | ||
6e0cd088 | 2674 | ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); |
e3014d14 JK |
2675 | if (ifree >= isize_diff) |
2676 | goto shift; | |
6dd4ee7c KS |
2677 | |
2678 | /* | |
2679 | * Enough free space isn't available in the inode, check if | |
2680 | * EA block can hold new_extra_isize bytes. | |
2681 | */ | |
2682 | if (EXT4_I(inode)->i_file_acl) { | |
2683 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
2684 | error = -EIO; | |
2685 | if (!bh) | |
2686 | goto cleanup; | |
cc8e94fd | 2687 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
2688 | EXT4_ERROR_INODE(inode, "bad block %llu", |
2689 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 2690 | error = -EFSCORRUPTED; |
b640b2c5 | 2691 | brelse(bh); |
6dd4ee7c KS |
2692 | goto cleanup; |
2693 | } | |
2694 | base = BHDR(bh); | |
6dd4ee7c KS |
2695 | end = bh->b_data + bh->b_size; |
2696 | min_offs = end - base; | |
6e0cd088 JK |
2697 | bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, |
2698 | NULL); | |
b640b2c5 | 2699 | brelse(bh); |
e3014d14 | 2700 | if (bfree + ifree < isize_diff) { |
6dd4ee7c KS |
2701 | if (!tried_min_extra_isize && s_min_extra_isize) { |
2702 | tried_min_extra_isize++; | |
2703 | new_extra_isize = s_min_extra_isize; | |
6dd4ee7c KS |
2704 | goto retry; |
2705 | } | |
dfa2064b | 2706 | error = -ENOSPC; |
6dd4ee7c KS |
2707 | goto cleanup; |
2708 | } | |
2709 | } else { | |
e3014d14 | 2710 | bfree = inode->i_sb->s_blocksize; |
6dd4ee7c KS |
2711 | } |
2712 | ||
dfa2064b JK |
2713 | error = ext4_xattr_make_inode_space(handle, inode, raw_inode, |
2714 | isize_diff, ifree, bfree, | |
2715 | &total_ino); | |
2716 | if (error) { | |
2717 | if (error == -ENOSPC && !tried_min_extra_isize && | |
2718 | s_min_extra_isize) { | |
2719 | tried_min_extra_isize++; | |
2720 | new_extra_isize = s_min_extra_isize; | |
dfa2064b | 2721 | goto retry; |
6dd4ee7c | 2722 | } |
dfa2064b | 2723 | goto cleanup; |
6dd4ee7c | 2724 | } |
e3014d14 JK |
2725 | shift: |
2726 | /* Adjust the offsets and shift the remaining entries ahead */ | |
6e0cd088 | 2727 | ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize |
e3014d14 JK |
2728 | - new_extra_isize, (void *)raw_inode + |
2729 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
94405713 | 2730 | (void *)header, total_ino); |
e3014d14 | 2731 | EXT4_I(inode)->i_extra_isize = new_extra_isize; |
6dd4ee7c KS |
2732 | |
2733 | cleanup: | |
b640b2c5 | 2734 | if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { |
cf0a5e81 MX |
2735 | ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", |
2736 | inode->i_ino); | |
2737 | mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); | |
2738 | } | |
6dd4ee7c KS |
2739 | return error; |
2740 | } | |
2741 | ||
e50e5129 AD |
2742 | #define EIA_INCR 16 /* must be 2^n */ |
2743 | #define EIA_MASK (EIA_INCR - 1) | |
dec214d0 TE |
2744 | |
2745 | /* Add the large xattr @inode into @ea_inode_array for deferred iput(). | |
0421a189 | 2746 | * If @ea_inode_array is new or full it will be grown and the old |
e50e5129 AD |
2747 | * contents copied over. |
2748 | */ | |
2749 | static int | |
0421a189 TE |
2750 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, |
2751 | struct inode *inode) | |
e50e5129 | 2752 | { |
0421a189 | 2753 | if (*ea_inode_array == NULL) { |
e50e5129 AD |
2754 | /* |
2755 | * Start with 15 inodes, so it fits into a power-of-two size. | |
0421a189 | 2756 | * If *ea_inode_array is NULL, this is essentially offsetof() |
e50e5129 | 2757 | */ |
0421a189 TE |
2758 | (*ea_inode_array) = |
2759 | kmalloc(offsetof(struct ext4_xattr_inode_array, | |
2760 | inodes[EIA_MASK]), | |
e50e5129 | 2761 | GFP_NOFS); |
0421a189 | 2762 | if (*ea_inode_array == NULL) |
e50e5129 | 2763 | return -ENOMEM; |
0421a189 TE |
2764 | (*ea_inode_array)->count = 0; |
2765 | } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { | |
e50e5129 | 2766 | /* expand the array once all 15 + n * 16 slots are full */ |
0421a189 TE |
2767 | struct ext4_xattr_inode_array *new_array = NULL; |
2768 | int count = (*ea_inode_array)->count; | |
e50e5129 AD |
2769 | |
2770 | /* if new_array is NULL, this is essentially offsetof() */ | |
2771 | new_array = kmalloc( | |
0421a189 TE |
2772 | offsetof(struct ext4_xattr_inode_array, |
2773 | inodes[count + EIA_INCR]), | |
e50e5129 AD |
2774 | GFP_NOFS); |
2775 | if (new_array == NULL) | |
2776 | return -ENOMEM; | |
0421a189 TE |
2777 | memcpy(new_array, *ea_inode_array, |
2778 | offsetof(struct ext4_xattr_inode_array, inodes[count])); | |
2779 | kfree(*ea_inode_array); | |
2780 | *ea_inode_array = new_array; | |
e50e5129 | 2781 | } |
0421a189 | 2782 | (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; |
e50e5129 AD |
2783 | return 0; |
2784 | } | |
2785 | ||
ac27a0ec | 2786 | /* |
617ba13b | 2787 | * ext4_xattr_delete_inode() |
ac27a0ec | 2788 | * |
e50e5129 | 2789 | * Free extended attribute resources associated with this inode. Traverse |
dec214d0 TE |
2790 | * all entries and decrement reference on any xattr inodes associated with this |
2791 | * inode. This is called immediately before an inode is freed. We have exclusive | |
2792 | * access to the inode. If an orphan inode is deleted it will also release its | |
2793 | * references on xattr block and xattr inodes. | |
ac27a0ec | 2794 | */ |
dec214d0 TE |
2795 | int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, |
2796 | struct ext4_xattr_inode_array **ea_inode_array, | |
2797 | int extra_credits) | |
ac27a0ec DK |
2798 | { |
2799 | struct buffer_head *bh = NULL; | |
e50e5129 | 2800 | struct ext4_xattr_ibody_header *header; |
30a7eb97 | 2801 | struct ext4_iloc iloc = { .bh = NULL }; |
dec214d0 | 2802 | struct ext4_xattr_entry *entry; |
30a7eb97 TE |
2803 | int error; |
2804 | ||
2805 | error = ext4_xattr_ensure_credits(handle, inode, extra_credits, | |
2806 | NULL /* bh */, | |
2807 | false /* dirty */, | |
2808 | false /* block_csum */); | |
2809 | if (error) { | |
2810 | EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); | |
2811 | goto cleanup; | |
2812 | } | |
ac27a0ec | 2813 | |
dec214d0 TE |
2814 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2815 | ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
e50e5129 | 2816 | |
dec214d0 TE |
2817 | error = ext4_get_inode_loc(inode, &iloc); |
2818 | if (error) { | |
2819 | EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); | |
2820 | goto cleanup; | |
2821 | } | |
30a7eb97 | 2822 | |
dec214d0 TE |
2823 | error = ext4_journal_get_write_access(handle, iloc.bh); |
2824 | if (error) { | |
2825 | EXT4_ERROR_INODE(inode, "write access (error %d)", | |
2826 | error); | |
2827 | goto cleanup; | |
2828 | } | |
e50e5129 | 2829 | |
dec214d0 TE |
2830 | header = IHDR(inode, ext4_raw_inode(&iloc)); |
2831 | if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) | |
2832 | ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, | |
2833 | IFIRST(header), | |
2834 | false /* block_csum */, | |
2835 | ea_inode_array, | |
2836 | extra_credits, | |
2837 | false /* skip_quota */); | |
ac27a0ec | 2838 | } |
e50e5129 | 2839 | |
dec214d0 TE |
2840 | if (EXT4_I(inode)->i_file_acl) { |
2841 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
2842 | if (!bh) { | |
2843 | EXT4_ERROR_INODE(inode, "block %llu read error", | |
30a7eb97 | 2844 | EXT4_I(inode)->i_file_acl); |
dec214d0 TE |
2845 | error = -EIO; |
2846 | goto cleanup; | |
2847 | } | |
2848 | error = ext4_xattr_check_block(inode, bh); | |
2849 | if (error) { | |
2850 | EXT4_ERROR_INODE(inode, "bad block %llu (error %d)", | |
2851 | EXT4_I(inode)->i_file_acl, error); | |
e50e5129 AD |
2852 | goto cleanup; |
2853 | } | |
e50e5129 | 2854 | |
dec214d0 TE |
2855 | if (ext4_has_feature_ea_inode(inode->i_sb)) { |
2856 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
2857 | entry = EXT4_XATTR_NEXT(entry)) | |
2858 | if (entry->e_value_inum) | |
2859 | ext4_xattr_inode_free_quota(inode, | |
2860 | le32_to_cpu(entry->e_value_size)); | |
2861 | ||
2862 | } | |
2863 | ||
2864 | ext4_xattr_release_block(handle, inode, bh, ea_inode_array, | |
2865 | extra_credits); | |
2866 | /* | |
2867 | * Update i_file_acl value in the same transaction that releases | |
2868 | * block. | |
2869 | */ | |
2870 | EXT4_I(inode)->i_file_acl = 0; | |
2871 | error = ext4_mark_inode_dirty(handle, inode); | |
2872 | if (error) { | |
2873 | EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", | |
2874 | error); | |
2875 | goto cleanup; | |
2876 | } | |
30a7eb97 | 2877 | } |
dec214d0 | 2878 | error = 0; |
ac27a0ec | 2879 | cleanup: |
30a7eb97 | 2880 | brelse(iloc.bh); |
ac27a0ec | 2881 | brelse(bh); |
e50e5129 AD |
2882 | return error; |
2883 | } | |
2884 | ||
0421a189 | 2885 | void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) |
e50e5129 | 2886 | { |
dec214d0 | 2887 | int idx; |
e50e5129 | 2888 | |
0421a189 | 2889 | if (ea_inode_array == NULL) |
e50e5129 AD |
2890 | return; |
2891 | ||
dec214d0 TE |
2892 | for (idx = 0; idx < ea_inode_array->count; ++idx) |
2893 | iput(ea_inode_array->inodes[idx]); | |
0421a189 | 2894 | kfree(ea_inode_array); |
ac27a0ec DK |
2895 | } |
2896 | ||
ac27a0ec | 2897 | /* |
47387409 | 2898 | * ext4_xattr_block_cache_insert() |
ac27a0ec | 2899 | * |
47387409 | 2900 | * Create a new entry in the extended attribute block cache, and insert |
ac27a0ec DK |
2901 | * it unless such an entry is already in the cache. |
2902 | * | |
2903 | * Returns 0, or a negative error number on failure. | |
2904 | */ | |
2905 | static void | |
47387409 TE |
2906 | ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, |
2907 | struct buffer_head *bh) | |
ac27a0ec | 2908 | { |
6048c64b AG |
2909 | struct ext4_xattr_header *header = BHDR(bh); |
2910 | __u32 hash = le32_to_cpu(header->h_hash); | |
2911 | int reusable = le32_to_cpu(header->h_refcount) < | |
2912 | EXT4_XATTR_REFCOUNT_MAX; | |
ac27a0ec DK |
2913 | int error; |
2914 | ||
cdb7ee4c TE |
2915 | if (!ea_block_cache) |
2916 | return; | |
47387409 | 2917 | error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, |
6048c64b | 2918 | bh->b_blocknr, reusable); |
ac27a0ec | 2919 | if (error) { |
82939d79 | 2920 | if (error == -EBUSY) |
ac27a0ec | 2921 | ea_bdebug(bh, "already in cache"); |
82939d79 | 2922 | } else |
ac27a0ec | 2923 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
2924 | } |
2925 | ||
2926 | /* | |
617ba13b | 2927 | * ext4_xattr_cmp() |
ac27a0ec DK |
2928 | * |
2929 | * Compare two extended attribute blocks for equality. | |
2930 | * | |
2931 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
2932 | * a negative error number on errors. | |
2933 | */ | |
2934 | static int | |
617ba13b MC |
2935 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
2936 | struct ext4_xattr_header *header2) | |
ac27a0ec | 2937 | { |
617ba13b | 2938 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
2939 | |
2940 | entry1 = ENTRY(header1+1); | |
2941 | entry2 = ENTRY(header2+1); | |
2942 | while (!IS_LAST_ENTRY(entry1)) { | |
2943 | if (IS_LAST_ENTRY(entry2)) | |
2944 | return 1; | |
2945 | if (entry1->e_hash != entry2->e_hash || | |
2946 | entry1->e_name_index != entry2->e_name_index || | |
2947 | entry1->e_name_len != entry2->e_name_len || | |
2948 | entry1->e_value_size != entry2->e_value_size || | |
e50e5129 | 2949 | entry1->e_value_inum != entry2->e_value_inum || |
ac27a0ec DK |
2950 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) |
2951 | return 1; | |
7cec1918 TE |
2952 | if (!entry1->e_value_inum && |
2953 | memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), | |
ac27a0ec DK |
2954 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), |
2955 | le32_to_cpu(entry1->e_value_size))) | |
2956 | return 1; | |
2957 | ||
617ba13b MC |
2958 | entry1 = EXT4_XATTR_NEXT(entry1); |
2959 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
2960 | } |
2961 | if (!IS_LAST_ENTRY(entry2)) | |
2962 | return 1; | |
2963 | return 0; | |
2964 | } | |
2965 | ||
2966 | /* | |
47387409 | 2967 | * ext4_xattr_block_cache_find() |
ac27a0ec DK |
2968 | * |
2969 | * Find an identical extended attribute block. | |
2970 | * | |
2971 | * Returns a pointer to the block found, or NULL if such a block was | |
2972 | * not found or an error occurred. | |
2973 | */ | |
2974 | static struct buffer_head * | |
47387409 TE |
2975 | ext4_xattr_block_cache_find(struct inode *inode, |
2976 | struct ext4_xattr_header *header, | |
2977 | struct mb_cache_entry **pce) | |
ac27a0ec DK |
2978 | { |
2979 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 | 2980 | struct mb_cache_entry *ce; |
47387409 | 2981 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec | 2982 | |
cdb7ee4c TE |
2983 | if (!ea_block_cache) |
2984 | return NULL; | |
ac27a0ec DK |
2985 | if (!header->h_hash) |
2986 | return NULL; /* never share */ | |
2987 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
47387409 | 2988 | ce = mb_cache_entry_find_first(ea_block_cache, hash); |
ac27a0ec DK |
2989 | while (ce) { |
2990 | struct buffer_head *bh; | |
2991 | ||
c07dfcb4 | 2992 | bh = sb_bread(inode->i_sb, ce->e_value); |
ac27a0ec | 2993 | if (!bh) { |
24676da4 | 2994 | EXT4_ERROR_INODE(inode, "block %lu read error", |
c07dfcb4 | 2995 | (unsigned long)ce->e_value); |
617ba13b | 2996 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
ac27a0ec DK |
2997 | *pce = ce; |
2998 | return bh; | |
2999 | } | |
3000 | brelse(bh); | |
47387409 | 3001 | ce = mb_cache_entry_find_next(ea_block_cache, ce); |
ac27a0ec DK |
3002 | } |
3003 | return NULL; | |
3004 | } | |
3005 | ||
3006 | #define NAME_HASH_SHIFT 5 | |
3007 | #define VALUE_HASH_SHIFT 16 | |
3008 | ||
3009 | /* | |
617ba13b | 3010 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
3011 | * |
3012 | * Compute the hash of an extended attribute. | |
3013 | */ | |
b9fc761e TE |
3014 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
3015 | size_t value_count) | |
ac27a0ec DK |
3016 | { |
3017 | __u32 hash = 0; | |
ac27a0ec | 3018 | |
b9fc761e | 3019 | while (name_len--) { |
ac27a0ec DK |
3020 | hash = (hash << NAME_HASH_SHIFT) ^ |
3021 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
3022 | *name++; | |
3023 | } | |
b9fc761e TE |
3024 | while (value_count--) { |
3025 | hash = (hash << VALUE_HASH_SHIFT) ^ | |
3026 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
3027 | le32_to_cpu(*value++); | |
ac27a0ec | 3028 | } |
b9fc761e | 3029 | return cpu_to_le32(hash); |
ac27a0ec DK |
3030 | } |
3031 | ||
3032 | #undef NAME_HASH_SHIFT | |
3033 | #undef VALUE_HASH_SHIFT | |
3034 | ||
3035 | #define BLOCK_HASH_SHIFT 16 | |
3036 | ||
3037 | /* | |
617ba13b | 3038 | * ext4_xattr_rehash() |
ac27a0ec DK |
3039 | * |
3040 | * Re-compute the extended attribute hash value after an entry has changed. | |
3041 | */ | |
daf83281 | 3042 | static void ext4_xattr_rehash(struct ext4_xattr_header *header) |
ac27a0ec | 3043 | { |
617ba13b | 3044 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
3045 | __u32 hash = 0; |
3046 | ||
ac27a0ec DK |
3047 | here = ENTRY(header+1); |
3048 | while (!IS_LAST_ENTRY(here)) { | |
3049 | if (!here->e_hash) { | |
3050 | /* Block is not shared if an entry's hash value == 0 */ | |
3051 | hash = 0; | |
3052 | break; | |
3053 | } | |
3054 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
3055 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
3056 | le32_to_cpu(here->e_hash); | |
617ba13b | 3057 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
3058 | } |
3059 | header->h_hash = cpu_to_le32(hash); | |
3060 | } | |
3061 | ||
3062 | #undef BLOCK_HASH_SHIFT | |
3063 | ||
9c191f70 M |
3064 | #define HASH_BUCKET_BITS 10 |
3065 | ||
7a2508e1 | 3066 | struct mb_cache * |
82939d79 | 3067 | ext4_xattr_create_cache(void) |
ac27a0ec | 3068 | { |
7a2508e1 | 3069 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
3070 | } |
3071 | ||
7a2508e1 | 3072 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 3073 | { |
9c191f70 | 3074 | if (cache) |
7a2508e1 | 3075 | mb_cache_destroy(cache); |
ac27a0ec | 3076 | } |
9c191f70 | 3077 |