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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 | ||
7a2508e1 | 75 | static void ext4_xattr_cache_insert(struct mb_cache *, struct buffer_head *); |
617ba13b MC |
76 | static struct buffer_head *ext4_xattr_cache_find(struct inode *, |
77 | struct ext4_xattr_header *, | |
7a2508e1 | 78 | struct mb_cache_entry **); |
617ba13b MC |
79 | static void ext4_xattr_rehash(struct ext4_xattr_header *, |
80 | struct ext4_xattr_entry *); | |
ac27a0ec | 81 | |
d6006186 | 82 | static const struct xattr_handler * const ext4_xattr_handler_map[] = { |
617ba13b | 83 | [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, |
03010a33 | 84 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
85 | [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
86 | [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, | |
ac27a0ec | 87 | #endif |
617ba13b | 88 | [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, |
03010a33 | 89 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 90 | [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, |
ac27a0ec DK |
91 | #endif |
92 | }; | |
93 | ||
11e27528 | 94 | const struct xattr_handler *ext4_xattr_handlers[] = { |
617ba13b MC |
95 | &ext4_xattr_user_handler, |
96 | &ext4_xattr_trusted_handler, | |
03010a33 | 97 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
98 | &posix_acl_access_xattr_handler, |
99 | &posix_acl_default_xattr_handler, | |
ac27a0ec | 100 | #endif |
03010a33 | 101 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 102 | &ext4_xattr_security_handler, |
ac27a0ec DK |
103 | #endif |
104 | NULL | |
105 | }; | |
106 | ||
9c191f70 M |
107 | #define EXT4_GET_MB_CACHE(inode) (((struct ext4_sb_info *) \ |
108 | inode->i_sb->s_fs_info)->s_mb_cache) | |
109 | ||
33d201e0 TE |
110 | #ifdef CONFIG_LOCKDEP |
111 | void ext4_xattr_inode_set_class(struct inode *ea_inode) | |
112 | { | |
113 | lockdep_set_subclass(&ea_inode->i_rwsem, 1); | |
114 | } | |
115 | #endif | |
116 | ||
cc8e94fd DW |
117 | static __le32 ext4_xattr_block_csum(struct inode *inode, |
118 | sector_t block_nr, | |
119 | struct ext4_xattr_header *hdr) | |
120 | { | |
121 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
d6a77105 | 122 | __u32 csum; |
d6a77105 | 123 | __le64 dsk_block_nr = cpu_to_le64(block_nr); |
b47820ed DJ |
124 | __u32 dummy_csum = 0; |
125 | int offset = offsetof(struct ext4_xattr_header, h_checksum); | |
cc8e94fd | 126 | |
d6a77105 TT |
127 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, |
128 | sizeof(dsk_block_nr)); | |
b47820ed DJ |
129 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); |
130 | csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); | |
131 | offset += sizeof(dummy_csum); | |
132 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, | |
133 | EXT4_BLOCK_SIZE(inode->i_sb) - offset); | |
41eb70dd | 134 | |
cc8e94fd DW |
135 | return cpu_to_le32(csum); |
136 | } | |
137 | ||
138 | static int ext4_xattr_block_csum_verify(struct inode *inode, | |
dac7a4b4 | 139 | struct buffer_head *bh) |
cc8e94fd | 140 | { |
dac7a4b4 TT |
141 | struct ext4_xattr_header *hdr = BHDR(bh); |
142 | int ret = 1; | |
cc8e94fd | 143 | |
dac7a4b4 TT |
144 | if (ext4_has_metadata_csum(inode->i_sb)) { |
145 | lock_buffer(bh); | |
146 | ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, | |
147 | bh->b_blocknr, hdr)); | |
148 | unlock_buffer(bh); | |
149 | } | |
150 | return ret; | |
cc8e94fd DW |
151 | } |
152 | ||
dac7a4b4 TT |
153 | static void ext4_xattr_block_csum_set(struct inode *inode, |
154 | struct buffer_head *bh) | |
cc8e94fd | 155 | { |
dac7a4b4 TT |
156 | if (ext4_has_metadata_csum(inode->i_sb)) |
157 | BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, | |
158 | bh->b_blocknr, BHDR(bh)); | |
cc8e94fd DW |
159 | } |
160 | ||
11e27528 | 161 | static inline const struct xattr_handler * |
617ba13b | 162 | ext4_xattr_handler(int name_index) |
ac27a0ec | 163 | { |
11e27528 | 164 | const struct xattr_handler *handler = NULL; |
ac27a0ec | 165 | |
617ba13b MC |
166 | if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
167 | handler = ext4_xattr_handler_map[name_index]; | |
ac27a0ec DK |
168 | return handler; |
169 | } | |
170 | ||
ac27a0ec | 171 | static int |
2c4f9923 EB |
172 | ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, |
173 | void *value_start) | |
ac27a0ec | 174 | { |
a0626e75 DW |
175 | struct ext4_xattr_entry *e = entry; |
176 | ||
d7614cc1 | 177 | /* Find the end of the names list */ |
a0626e75 DW |
178 | while (!IS_LAST_ENTRY(e)) { |
179 | struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); | |
ac27a0ec | 180 | if ((void *)next >= end) |
6a797d27 | 181 | return -EFSCORRUPTED; |
a0626e75 | 182 | e = next; |
ac27a0ec | 183 | } |
a0626e75 | 184 | |
d7614cc1 | 185 | /* Check the values */ |
a0626e75 | 186 | while (!IS_LAST_ENTRY(entry)) { |
e50e5129 AD |
187 | if (entry->e_value_size != 0 && |
188 | entry->e_value_inum == 0) { | |
d7614cc1 EB |
189 | u16 offs = le16_to_cpu(entry->e_value_offs); |
190 | u32 size = le32_to_cpu(entry->e_value_size); | |
191 | void *value; | |
192 | ||
193 | /* | |
194 | * The value cannot overlap the names, and the value | |
195 | * with padding cannot extend beyond 'end'. Check both | |
196 | * the padded and unpadded sizes, since the size may | |
197 | * overflow to 0 when adding padding. | |
198 | */ | |
199 | if (offs > end - value_start) | |
200 | return -EFSCORRUPTED; | |
201 | value = value_start + offs; | |
202 | if (value < (void *)e + sizeof(u32) || | |
203 | size > end - value || | |
204 | EXT4_XATTR_SIZE(size) > end - value) | |
205 | return -EFSCORRUPTED; | |
206 | } | |
a0626e75 DW |
207 | entry = EXT4_XATTR_NEXT(entry); |
208 | } | |
209 | ||
ac27a0ec DK |
210 | return 0; |
211 | } | |
212 | ||
213 | static inline int | |
cc8e94fd | 214 | ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) |
ac27a0ec | 215 | { |
cc8e94fd DW |
216 | int error; |
217 | ||
218 | if (buffer_verified(bh)) | |
219 | return 0; | |
220 | ||
617ba13b | 221 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 222 | BHDR(bh)->h_blocks != cpu_to_le32(1)) |
6a797d27 | 223 | return -EFSCORRUPTED; |
dac7a4b4 | 224 | if (!ext4_xattr_block_csum_verify(inode, bh)) |
6a797d27 | 225 | return -EFSBADCRC; |
2c4f9923 EB |
226 | error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, |
227 | bh->b_data); | |
cc8e94fd DW |
228 | if (!error) |
229 | set_buffer_verified(bh); | |
230 | return error; | |
ac27a0ec DK |
231 | } |
232 | ||
9e92f48c TT |
233 | static int |
234 | __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, | |
235 | void *end, const char *function, unsigned int line) | |
236 | { | |
9e92f48c TT |
237 | int error = -EFSCORRUPTED; |
238 | ||
290ab230 | 239 | if (end - (void *)header < sizeof(*header) + sizeof(u32) || |
19962509 | 240 | (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) |
9e92f48c | 241 | goto errout; |
2c4f9923 | 242 | error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); |
9e92f48c TT |
243 | errout: |
244 | if (error) | |
245 | __ext4_error_inode(inode, function, line, 0, | |
246 | "corrupted in-inode xattr"); | |
247 | return error; | |
248 | } | |
249 | ||
250 | #define xattr_check_inode(inode, header, end) \ | |
251 | __xattr_check_inode((inode), (header), (end), __func__, __LINE__) | |
252 | ||
ac27a0ec | 253 | static int |
617ba13b | 254 | ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, |
6ba644b9 | 255 | const char *name, int sorted) |
ac27a0ec | 256 | { |
617ba13b | 257 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
258 | size_t name_len; |
259 | int cmp = 1; | |
260 | ||
261 | if (name == NULL) | |
262 | return -EINVAL; | |
263 | name_len = strlen(name); | |
264 | entry = *pentry; | |
617ba13b | 265 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
ac27a0ec DK |
266 | cmp = name_index - entry->e_name_index; |
267 | if (!cmp) | |
268 | cmp = name_len - entry->e_name_len; | |
269 | if (!cmp) | |
270 | cmp = memcmp(name, entry->e_name, name_len); | |
271 | if (cmp <= 0 && (sorted || cmp == 0)) | |
272 | break; | |
273 | } | |
274 | *pentry = entry; | |
ac27a0ec DK |
275 | return cmp ? -ENODATA : 0; |
276 | } | |
277 | ||
e50e5129 AD |
278 | /* |
279 | * Read the EA value from an inode. | |
280 | */ | |
281 | static int | |
282 | ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t *size) | |
283 | { | |
284 | unsigned long block = 0; | |
285 | struct buffer_head *bh = NULL; | |
286 | int blocksize; | |
287 | size_t csize, ret_size = 0; | |
288 | ||
289 | if (*size == 0) | |
290 | return 0; | |
291 | ||
292 | blocksize = ea_inode->i_sb->s_blocksize; | |
293 | ||
294 | while (ret_size < *size) { | |
295 | csize = (*size - ret_size) > blocksize ? blocksize : | |
296 | *size - ret_size; | |
297 | bh = ext4_bread(NULL, ea_inode, block, 0); | |
298 | if (IS_ERR(bh)) { | |
299 | *size = ret_size; | |
300 | return PTR_ERR(bh); | |
301 | } | |
302 | memcpy(buf, bh->b_data, csize); | |
303 | brelse(bh); | |
304 | ||
305 | buf += csize; | |
306 | block += 1; | |
307 | ret_size += csize; | |
308 | } | |
309 | ||
310 | *size = ret_size; | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
315 | struct inode *ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, int *err) | |
316 | { | |
317 | struct inode *ea_inode = NULL; | |
318 | ||
319 | ea_inode = ext4_iget(parent->i_sb, ea_ino); | |
320 | if (IS_ERR(ea_inode) || is_bad_inode(ea_inode)) { | |
321 | int rc = IS_ERR(ea_inode) ? PTR_ERR(ea_inode) : 0; | |
322 | ext4_error(parent->i_sb, "error while reading EA inode %lu " | |
323 | "/ %d %d", ea_ino, rc, is_bad_inode(ea_inode)); | |
324 | *err = rc != 0 ? rc : -EIO; | |
325 | return NULL; | |
326 | } | |
327 | ||
328 | if (EXT4_XATTR_INODE_GET_PARENT(ea_inode) != parent->i_ino || | |
329 | ea_inode->i_generation != parent->i_generation) { | |
330 | ext4_error(parent->i_sb, "Backpointer from EA inode %lu " | |
331 | "to parent invalid.", ea_ino); | |
332 | *err = -EINVAL; | |
333 | goto error; | |
334 | } | |
335 | ||
336 | if (!(EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL)) { | |
337 | ext4_error(parent->i_sb, "EA inode %lu does not have " | |
338 | "EXT4_EA_INODE_FL flag set.\n", ea_ino); | |
339 | *err = -EINVAL; | |
340 | goto error; | |
341 | } | |
342 | ||
343 | *err = 0; | |
344 | return ea_inode; | |
345 | ||
346 | error: | |
347 | iput(ea_inode); | |
348 | return NULL; | |
349 | } | |
350 | ||
351 | /* | |
352 | * Read the value from the EA inode. | |
353 | */ | |
354 | static int | |
355 | ext4_xattr_inode_get(struct inode *inode, unsigned long ea_ino, void *buffer, | |
356 | size_t *size) | |
357 | { | |
358 | struct inode *ea_inode = NULL; | |
359 | int err; | |
360 | ||
361 | ea_inode = ext4_xattr_inode_iget(inode, ea_ino, &err); | |
362 | if (err) | |
363 | return err; | |
364 | ||
365 | err = ext4_xattr_inode_read(ea_inode, buffer, size); | |
366 | iput(ea_inode); | |
367 | ||
368 | return err; | |
369 | } | |
370 | ||
ac27a0ec | 371 | static int |
617ba13b | 372 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
373 | void *buffer, size_t buffer_size) |
374 | { | |
375 | struct buffer_head *bh = NULL; | |
617ba13b | 376 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
377 | size_t size; |
378 | int error; | |
7a2508e1 | 379 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
380 | |
381 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
382 | name_index, name, buffer, (long)buffer_size); | |
383 | ||
384 | error = -ENODATA; | |
617ba13b | 385 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 386 | goto cleanup; |
ace36ad4 JP |
387 | ea_idebug(inode, "reading block %llu", |
388 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 389 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
390 | if (!bh) |
391 | goto cleanup; | |
392 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
393 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 394 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
395 | EXT4_ERROR_INODE(inode, "bad block %llu", |
396 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 397 | error = -EFSCORRUPTED; |
ac27a0ec DK |
398 | goto cleanup; |
399 | } | |
9c191f70 | 400 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
ac27a0ec | 401 | entry = BFIRST(bh); |
6ba644b9 | 402 | error = ext4_xattr_find_entry(&entry, name_index, name, 1); |
ac27a0ec DK |
403 | if (error) |
404 | goto cleanup; | |
405 | size = le32_to_cpu(entry->e_value_size); | |
406 | if (buffer) { | |
407 | error = -ERANGE; | |
408 | if (size > buffer_size) | |
409 | goto cleanup; | |
e50e5129 AD |
410 | if (entry->e_value_inum) { |
411 | error = ext4_xattr_inode_get(inode, | |
412 | le32_to_cpu(entry->e_value_inum), | |
413 | buffer, &size); | |
414 | if (error) | |
415 | goto cleanup; | |
416 | } else { | |
417 | memcpy(buffer, bh->b_data + | |
418 | le16_to_cpu(entry->e_value_offs), size); | |
419 | } | |
ac27a0ec DK |
420 | } |
421 | error = size; | |
422 | ||
423 | cleanup: | |
424 | brelse(bh); | |
425 | return error; | |
426 | } | |
427 | ||
879b3825 | 428 | int |
617ba13b | 429 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
430 | void *buffer, size_t buffer_size) |
431 | { | |
617ba13b MC |
432 | struct ext4_xattr_ibody_header *header; |
433 | struct ext4_xattr_entry *entry; | |
434 | struct ext4_inode *raw_inode; | |
435 | struct ext4_iloc iloc; | |
ac27a0ec DK |
436 | size_t size; |
437 | void *end; | |
438 | int error; | |
439 | ||
19f5fb7a | 440 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 441 | return -ENODATA; |
617ba13b | 442 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
443 | if (error) |
444 | return error; | |
617ba13b | 445 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 446 | header = IHDR(inode, raw_inode); |
617ba13b | 447 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 448 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
449 | if (error) |
450 | goto cleanup; | |
6ba644b9 EB |
451 | entry = IFIRST(header); |
452 | error = ext4_xattr_find_entry(&entry, name_index, name, 0); | |
ac27a0ec DK |
453 | if (error) |
454 | goto cleanup; | |
455 | size = le32_to_cpu(entry->e_value_size); | |
456 | if (buffer) { | |
457 | error = -ERANGE; | |
458 | if (size > buffer_size) | |
459 | goto cleanup; | |
e50e5129 AD |
460 | if (entry->e_value_inum) { |
461 | error = ext4_xattr_inode_get(inode, | |
462 | le32_to_cpu(entry->e_value_inum), | |
463 | buffer, &size); | |
464 | if (error) | |
465 | goto cleanup; | |
466 | } else { | |
467 | memcpy(buffer, (void *)IFIRST(header) + | |
468 | le16_to_cpu(entry->e_value_offs), size); | |
469 | } | |
ac27a0ec DK |
470 | } |
471 | error = size; | |
472 | ||
473 | cleanup: | |
474 | brelse(iloc.bh); | |
475 | return error; | |
476 | } | |
477 | ||
478 | /* | |
617ba13b | 479 | * ext4_xattr_get() |
ac27a0ec DK |
480 | * |
481 | * Copy an extended attribute into the buffer | |
482 | * provided, or compute the buffer size required. | |
483 | * Buffer is NULL to compute the size of the buffer required. | |
484 | * | |
485 | * Returns a negative error number on failure, or the number of bytes | |
486 | * used / required on success. | |
487 | */ | |
488 | int | |
617ba13b | 489 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
490 | void *buffer, size_t buffer_size) |
491 | { | |
492 | int error; | |
493 | ||
0db1ff22 TT |
494 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
495 | return -EIO; | |
496 | ||
230b8c1a ZZ |
497 | if (strlen(name) > 255) |
498 | return -ERANGE; | |
499 | ||
617ba13b MC |
500 | down_read(&EXT4_I(inode)->xattr_sem); |
501 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
502 | buffer_size); |
503 | if (error == -ENODATA) | |
617ba13b | 504 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 505 | buffer_size); |
617ba13b | 506 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
507 | return error; |
508 | } | |
509 | ||
510 | static int | |
431547b3 | 511 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
512 | char *buffer, size_t buffer_size) |
513 | { | |
514 | size_t rest = buffer_size; | |
515 | ||
617ba13b | 516 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 517 | const struct xattr_handler *handler = |
617ba13b | 518 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec | 519 | |
764a5c6b AG |
520 | if (handler && (!handler->list || handler->list(dentry))) { |
521 | const char *prefix = handler->prefix ?: handler->name; | |
522 | size_t prefix_len = strlen(prefix); | |
523 | size_t size = prefix_len + entry->e_name_len + 1; | |
524 | ||
ac27a0ec DK |
525 | if (buffer) { |
526 | if (size > rest) | |
527 | return -ERANGE; | |
764a5c6b AG |
528 | memcpy(buffer, prefix, prefix_len); |
529 | buffer += prefix_len; | |
530 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
531 | buffer += entry->e_name_len; | |
532 | *buffer++ = 0; | |
ac27a0ec DK |
533 | } |
534 | rest -= size; | |
535 | } | |
536 | } | |
764a5c6b | 537 | return buffer_size - rest; /* total size */ |
ac27a0ec DK |
538 | } |
539 | ||
540 | static int | |
431547b3 | 541 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 542 | { |
2b0143b5 | 543 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
544 | struct buffer_head *bh = NULL; |
545 | int error; | |
7a2508e1 | 546 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
547 | |
548 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
549 | buffer, (long)buffer_size); | |
550 | ||
551 | error = 0; | |
617ba13b | 552 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 553 | goto cleanup; |
ace36ad4 JP |
554 | ea_idebug(inode, "reading block %llu", |
555 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 556 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
557 | error = -EIO; |
558 | if (!bh) | |
559 | goto cleanup; | |
560 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
561 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 562 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
563 | EXT4_ERROR_INODE(inode, "bad block %llu", |
564 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 565 | error = -EFSCORRUPTED; |
ac27a0ec DK |
566 | goto cleanup; |
567 | } | |
9c191f70 | 568 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
431547b3 | 569 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); |
ac27a0ec DK |
570 | |
571 | cleanup: | |
572 | brelse(bh); | |
573 | ||
574 | return error; | |
575 | } | |
576 | ||
577 | static int | |
431547b3 | 578 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 579 | { |
2b0143b5 | 580 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
581 | struct ext4_xattr_ibody_header *header; |
582 | struct ext4_inode *raw_inode; | |
583 | struct ext4_iloc iloc; | |
ac27a0ec DK |
584 | void *end; |
585 | int error; | |
586 | ||
19f5fb7a | 587 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 588 | return 0; |
617ba13b | 589 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
590 | if (error) |
591 | return error; | |
617ba13b | 592 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 593 | header = IHDR(inode, raw_inode); |
617ba13b | 594 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 595 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
596 | if (error) |
597 | goto cleanup; | |
431547b3 | 598 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
599 | buffer, buffer_size); |
600 | ||
601 | cleanup: | |
602 | brelse(iloc.bh); | |
603 | return error; | |
604 | } | |
605 | ||
606 | /* | |
ba7ea1d8 EB |
607 | * Inode operation listxattr() |
608 | * | |
609 | * d_inode(dentry)->i_rwsem: don't care | |
ac27a0ec DK |
610 | * |
611 | * Copy a list of attribute names into the buffer | |
612 | * provided, or compute the buffer size required. | |
613 | * Buffer is NULL to compute the size of the buffer required. | |
614 | * | |
615 | * Returns a negative error number on failure, or the number of bytes | |
616 | * used / required on success. | |
617 | */ | |
ba7ea1d8 EB |
618 | ssize_t |
619 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
ac27a0ec | 620 | { |
eaeef867 | 621 | int ret, ret2; |
ac27a0ec | 622 | |
2b0143b5 | 623 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
624 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
625 | if (ret < 0) | |
626 | goto errout; | |
627 | if (buffer) { | |
628 | buffer += ret; | |
629 | buffer_size -= ret; | |
ac27a0ec | 630 | } |
eaeef867 TT |
631 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
632 | if (ret < 0) | |
633 | goto errout; | |
634 | ret += ret2; | |
635 | errout: | |
2b0143b5 | 636 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 637 | return ret; |
ac27a0ec DK |
638 | } |
639 | ||
640 | /* | |
617ba13b | 641 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
642 | * not set, set it. |
643 | */ | |
617ba13b | 644 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
645 | struct super_block *sb) |
646 | { | |
e2b911c5 | 647 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
648 | return; |
649 | ||
5d601255 | 650 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 651 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
e2b911c5 | 652 | ext4_set_feature_xattr(sb); |
a0375156 | 653 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec | 654 | } |
ac27a0ec DK |
655 | } |
656 | ||
657 | /* | |
ec4cb1aa JK |
658 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
659 | * otherwise free the block. | |
ac27a0ec DK |
660 | */ |
661 | static void | |
617ba13b | 662 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
ac27a0ec DK |
663 | struct buffer_head *bh) |
664 | { | |
6048c64b AG |
665 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
666 | u32 hash, ref; | |
8a2bfdcb | 667 | int error = 0; |
ac27a0ec | 668 | |
5d601255 | 669 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
670 | error = ext4_journal_get_write_access(handle, bh); |
671 | if (error) | |
672 | goto out; | |
673 | ||
674 | lock_buffer(bh); | |
6048c64b AG |
675 | hash = le32_to_cpu(BHDR(bh)->h_hash); |
676 | ref = le32_to_cpu(BHDR(bh)->h_refcount); | |
677 | if (ref == 1) { | |
ac27a0ec | 678 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
679 | /* |
680 | * This must happen under buffer lock for | |
681 | * ext4_xattr_block_set() to reliably detect freed block | |
682 | */ | |
6048c64b | 683 | mb_cache_entry_delete_block(ext4_mb_cache, hash, bh->b_blocknr); |
ac27a0ec | 684 | get_bh(bh); |
ec4cb1aa | 685 | unlock_buffer(bh); |
e6362609 TT |
686 | ext4_free_blocks(handle, inode, bh, 0, 1, |
687 | EXT4_FREE_BLOCKS_METADATA | | |
688 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 689 | } else { |
6048c64b AG |
690 | ref--; |
691 | BHDR(bh)->h_refcount = cpu_to_le32(ref); | |
692 | if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { | |
693 | struct mb_cache_entry *ce; | |
694 | ||
695 | ce = mb_cache_entry_get(ext4_mb_cache, hash, | |
696 | bh->b_blocknr); | |
697 | if (ce) { | |
698 | ce->e_reusable = 1; | |
699 | mb_cache_entry_put(ext4_mb_cache, ce); | |
700 | } | |
701 | } | |
702 | ||
dac7a4b4 | 703 | ext4_xattr_block_csum_set(inode, bh); |
ec4cb1aa JK |
704 | /* |
705 | * Beware of this ugliness: Releasing of xattr block references | |
706 | * from different inodes can race and so we have to protect | |
707 | * from a race where someone else frees the block (and releases | |
708 | * its journal_head) before we are done dirtying the buffer. In | |
709 | * nojournal mode this race is harmless and we actually cannot | |
dac7a4b4 | 710 | * call ext4_handle_dirty_metadata() with locked buffer as |
ec4cb1aa JK |
711 | * that function can call sync_dirty_buffer() so for that case |
712 | * we handle the dirtying after unlocking the buffer. | |
713 | */ | |
714 | if (ext4_handle_valid(handle)) | |
dac7a4b4 | 715 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
c1bb05a6 | 716 | unlock_buffer(bh); |
ec4cb1aa | 717 | if (!ext4_handle_valid(handle)) |
dac7a4b4 | 718 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
8a2bfdcb | 719 | if (IS_SYNC(inode)) |
0390131b | 720 | ext4_handle_sync(handle); |
1231b3a1 | 721 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
722 | ea_bdebug(bh, "refcount now=%d; releasing", |
723 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 724 | } |
8a2bfdcb MC |
725 | out: |
726 | ext4_std_error(inode->i_sb, error); | |
727 | return; | |
ac27a0ec DK |
728 | } |
729 | ||
6dd4ee7c KS |
730 | /* |
731 | * Find the available free space for EAs. This also returns the total number of | |
732 | * bytes used by EA entries. | |
733 | */ | |
734 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
735 | size_t *min_offs, void *base, int *total) | |
736 | { | |
737 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 738 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
739 | size_t offs = le16_to_cpu(last->e_value_offs); |
740 | if (offs < *min_offs) | |
741 | *min_offs = offs; | |
742 | } | |
7b1b2c1b TT |
743 | if (total) |
744 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
745 | } |
746 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
747 | } | |
748 | ||
e50e5129 AD |
749 | /* |
750 | * Write the value of the EA in an inode. | |
751 | */ | |
752 | static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, | |
753 | const void *buf, int bufsize) | |
754 | { | |
755 | struct buffer_head *bh = NULL; | |
756 | unsigned long block = 0; | |
757 | unsigned blocksize = ea_inode->i_sb->s_blocksize; | |
758 | unsigned max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; | |
759 | int csize, wsize = 0; | |
760 | int ret = 0; | |
761 | int retries = 0; | |
762 | ||
763 | retry: | |
764 | while (ret >= 0 && ret < max_blocks) { | |
765 | struct ext4_map_blocks map; | |
766 | map.m_lblk = block += ret; | |
767 | map.m_len = max_blocks -= ret; | |
768 | ||
769 | ret = ext4_map_blocks(handle, ea_inode, &map, | |
770 | EXT4_GET_BLOCKS_CREATE); | |
771 | if (ret <= 0) { | |
772 | ext4_mark_inode_dirty(handle, ea_inode); | |
773 | if (ret == -ENOSPC && | |
774 | ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { | |
775 | ret = 0; | |
776 | goto retry; | |
777 | } | |
778 | break; | |
779 | } | |
780 | } | |
781 | ||
782 | if (ret < 0) | |
783 | return ret; | |
784 | ||
785 | block = 0; | |
786 | while (wsize < bufsize) { | |
787 | if (bh != NULL) | |
788 | brelse(bh); | |
789 | csize = (bufsize - wsize) > blocksize ? blocksize : | |
790 | bufsize - wsize; | |
791 | bh = ext4_getblk(handle, ea_inode, block, 0); | |
792 | if (IS_ERR(bh)) | |
793 | return PTR_ERR(bh); | |
794 | ret = ext4_journal_get_write_access(handle, bh); | |
795 | if (ret) | |
796 | goto out; | |
797 | ||
798 | memcpy(bh->b_data, buf, csize); | |
799 | set_buffer_uptodate(bh); | |
800 | ext4_handle_dirty_metadata(handle, ea_inode, bh); | |
801 | ||
802 | buf += csize; | |
803 | wsize += csize; | |
804 | block += 1; | |
805 | } | |
806 | ||
807 | inode_lock(ea_inode); | |
808 | i_size_write(ea_inode, wsize); | |
809 | ext4_update_i_disksize(ea_inode, wsize); | |
810 | inode_unlock(ea_inode); | |
811 | ||
812 | ext4_mark_inode_dirty(handle, ea_inode); | |
813 | ||
814 | out: | |
815 | brelse(bh); | |
816 | ||
817 | return ret; | |
818 | } | |
819 | ||
820 | /* | |
821 | * Create an inode to store the value of a large EA. | |
822 | */ | |
823 | static struct inode *ext4_xattr_inode_create(handle_t *handle, | |
824 | struct inode *inode) | |
825 | { | |
826 | struct inode *ea_inode = NULL; | |
bd3b963b | 827 | int err; |
e50e5129 AD |
828 | |
829 | /* | |
830 | * Let the next inode be the goal, so we try and allocate the EA inode | |
831 | * in the same group, or nearby one. | |
832 | */ | |
833 | ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, | |
1b917ed8 TE |
834 | S_IFREG | 0600, NULL, inode->i_ino + 1, NULL, |
835 | EXT4_EA_INODE_FL); | |
e50e5129 AD |
836 | if (!IS_ERR(ea_inode)) { |
837 | ea_inode->i_op = &ext4_file_inode_operations; | |
838 | ea_inode->i_fop = &ext4_file_operations; | |
839 | ext4_set_aops(ea_inode); | |
33d201e0 | 840 | ext4_xattr_inode_set_class(ea_inode); |
e50e5129 AD |
841 | ea_inode->i_generation = inode->i_generation; |
842 | EXT4_I(ea_inode)->i_flags |= EXT4_EA_INODE_FL; | |
843 | ||
844 | /* | |
845 | * A back-pointer from EA inode to parent inode will be useful | |
846 | * for e2fsck. | |
847 | */ | |
848 | EXT4_XATTR_INODE_SET_PARENT(ea_inode, inode->i_ino); | |
849 | unlock_new_inode(ea_inode); | |
bd3b963b TE |
850 | err = ext4_inode_attach_jinode(ea_inode); |
851 | if (err) { | |
852 | iput(ea_inode); | |
853 | return ERR_PTR(err); | |
854 | } | |
e50e5129 AD |
855 | } |
856 | ||
857 | return ea_inode; | |
858 | } | |
859 | ||
860 | /* | |
861 | * Unlink the inode storing the value of the EA. | |
862 | */ | |
863 | int ext4_xattr_inode_unlink(struct inode *inode, unsigned long ea_ino) | |
864 | { | |
865 | struct inode *ea_inode = NULL; | |
866 | int err; | |
867 | ||
868 | ea_inode = ext4_xattr_inode_iget(inode, ea_ino, &err); | |
869 | if (err) | |
870 | return err; | |
871 | ||
872 | clear_nlink(ea_inode); | |
873 | iput(ea_inode); | |
874 | ||
875 | return 0; | |
876 | } | |
877 | ||
878 | /* | |
879 | * Add value of the EA in an inode. | |
880 | */ | |
881 | static int ext4_xattr_inode_set(handle_t *handle, struct inode *inode, | |
882 | unsigned long *ea_ino, const void *value, | |
883 | size_t value_len) | |
884 | { | |
885 | struct inode *ea_inode; | |
886 | int err; | |
887 | ||
888 | /* Create an inode for the EA value */ | |
889 | ea_inode = ext4_xattr_inode_create(handle, inode); | |
890 | if (IS_ERR(ea_inode)) | |
891 | return PTR_ERR(ea_inode); | |
892 | ||
893 | err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); | |
894 | if (err) | |
895 | clear_nlink(ea_inode); | |
896 | else | |
897 | *ea_ino = ea_inode->i_ino; | |
898 | ||
899 | iput(ea_inode); | |
900 | ||
901 | return err; | |
902 | } | |
903 | ||
904 | static int ext4_xattr_set_entry(struct ext4_xattr_info *i, | |
905 | struct ext4_xattr_search *s, | |
906 | handle_t *handle, struct inode *inode) | |
ac27a0ec | 907 | { |
617ba13b | 908 | struct ext4_xattr_entry *last; |
ac27a0ec | 909 | size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); |
e50e5129 AD |
910 | int in_inode = i->in_inode; |
911 | int rc; | |
912 | ||
913 | if (ext4_has_feature_ea_inode(inode->i_sb) && | |
914 | (EXT4_XATTR_SIZE(i->value_len) > | |
915 | EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) | |
916 | in_inode = 1; | |
ac27a0ec DK |
917 | |
918 | /* Compute min_offs and last. */ | |
919 | last = s->first; | |
617ba13b | 920 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
e50e5129 | 921 | if (!last->e_value_inum && last->e_value_size) { |
ac27a0ec DK |
922 | size_t offs = le16_to_cpu(last->e_value_offs); |
923 | if (offs < min_offs) | |
924 | min_offs = offs; | |
925 | } | |
926 | } | |
927 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); | |
928 | if (!s->not_found) { | |
e50e5129 AD |
929 | if (!in_inode && |
930 | !s->here->e_value_inum && s->here->e_value_size) { | |
ac27a0ec | 931 | size_t size = le32_to_cpu(s->here->e_value_size); |
617ba13b | 932 | free += EXT4_XATTR_SIZE(size); |
ac27a0ec | 933 | } |
617ba13b | 934 | free += EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
935 | } |
936 | if (i->value) { | |
e50e5129 AD |
937 | size_t value_len = EXT4_XATTR_SIZE(i->value_len); |
938 | ||
939 | if (in_inode) | |
940 | value_len = 0; | |
941 | ||
942 | if (free < EXT4_XATTR_LEN(name_len) + value_len) | |
ac27a0ec DK |
943 | return -ENOSPC; |
944 | } | |
945 | ||
946 | if (i->value && s->not_found) { | |
947 | /* Insert the new name. */ | |
617ba13b | 948 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
949 | size_t rest = (void *)last - (void *)s->here + sizeof(__u32); |
950 | memmove((void *)s->here + size, s->here, rest); | |
951 | memset(s->here, 0, size); | |
952 | s->here->e_name_index = i->name_index; | |
953 | s->here->e_name_len = name_len; | |
954 | memcpy(s->here->e_name, i->name, name_len); | |
955 | } else { | |
e50e5129 AD |
956 | if (!s->here->e_value_inum && s->here->e_value_size && |
957 | s->here->e_value_offs > 0) { | |
ac27a0ec DK |
958 | void *first_val = s->base + min_offs; |
959 | size_t offs = le16_to_cpu(s->here->e_value_offs); | |
960 | void *val = s->base + offs; | |
617ba13b | 961 | size_t size = EXT4_XATTR_SIZE( |
ac27a0ec DK |
962 | le32_to_cpu(s->here->e_value_size)); |
963 | ||
617ba13b | 964 | if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { |
ac27a0ec DK |
965 | /* The old and the new value have the same |
966 | size. Just replace. */ | |
967 | s->here->e_value_size = | |
968 | cpu_to_le32(i->value_len); | |
bd9926e8 TT |
969 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
970 | memset(val, 0, size); | |
971 | } else { | |
972 | /* Clear pad bytes first. */ | |
973 | memset(val + size - EXT4_XATTR_PAD, 0, | |
974 | EXT4_XATTR_PAD); | |
975 | memcpy(val, i->value, i->value_len); | |
976 | } | |
ac27a0ec DK |
977 | return 0; |
978 | } | |
979 | ||
980 | /* Remove the old value. */ | |
981 | memmove(first_val + size, first_val, val - first_val); | |
982 | memset(first_val, 0, size); | |
983 | s->here->e_value_size = 0; | |
984 | s->here->e_value_offs = 0; | |
985 | min_offs += size; | |
986 | ||
987 | /* Adjust all value offsets. */ | |
988 | last = s->first; | |
989 | while (!IS_LAST_ENTRY(last)) { | |
990 | size_t o = le16_to_cpu(last->e_value_offs); | |
e50e5129 AD |
991 | if (!last->e_value_inum && |
992 | last->e_value_size && o < offs) | |
ac27a0ec DK |
993 | last->e_value_offs = |
994 | cpu_to_le16(o + size); | |
617ba13b | 995 | last = EXT4_XATTR_NEXT(last); |
ac27a0ec DK |
996 | } |
997 | } | |
e50e5129 AD |
998 | if (s->here->e_value_inum) { |
999 | ext4_xattr_inode_unlink(inode, | |
1000 | le32_to_cpu(s->here->e_value_inum)); | |
1001 | s->here->e_value_inum = 0; | |
1002 | } | |
ac27a0ec DK |
1003 | if (!i->value) { |
1004 | /* Remove the old name. */ | |
617ba13b | 1005 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
1006 | last = ENTRY((void *)last - size); |
1007 | memmove(s->here, (void *)s->here + size, | |
1008 | (void *)last - (void *)s->here + sizeof(__u32)); | |
1009 | memset(last, 0, size); | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | if (i->value) { | |
1014 | /* Insert the new value. */ | |
e50e5129 AD |
1015 | if (in_inode) { |
1016 | unsigned long ea_ino = | |
1017 | le32_to_cpu(s->here->e_value_inum); | |
1018 | rc = ext4_xattr_inode_set(handle, inode, &ea_ino, | |
1019 | i->value, i->value_len); | |
1020 | if (rc) | |
1021 | goto out; | |
1022 | s->here->e_value_inum = cpu_to_le32(ea_ino); | |
1023 | s->here->e_value_offs = 0; | |
1024 | } else if (i->value_len) { | |
617ba13b | 1025 | size_t size = EXT4_XATTR_SIZE(i->value_len); |
ac27a0ec DK |
1026 | void *val = s->base + min_offs - size; |
1027 | s->here->e_value_offs = cpu_to_le16(min_offs - size); | |
e50e5129 | 1028 | s->here->e_value_inum = 0; |
bd9926e8 TT |
1029 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
1030 | memset(val, 0, size); | |
1031 | } else { | |
1032 | /* Clear the pad bytes first. */ | |
1033 | memset(val + size - EXT4_XATTR_PAD, 0, | |
1034 | EXT4_XATTR_PAD); | |
1035 | memcpy(val, i->value, i->value_len); | |
1036 | } | |
ac27a0ec | 1037 | } |
e50e5129 | 1038 | s->here->e_value_size = cpu_to_le32(i->value_len); |
ac27a0ec | 1039 | } |
e50e5129 AD |
1040 | |
1041 | out: | |
1042 | return rc; | |
ac27a0ec DK |
1043 | } |
1044 | ||
617ba13b MC |
1045 | struct ext4_xattr_block_find { |
1046 | struct ext4_xattr_search s; | |
ac27a0ec DK |
1047 | struct buffer_head *bh; |
1048 | }; | |
1049 | ||
1050 | static int | |
617ba13b MC |
1051 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
1052 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1053 | { |
1054 | struct super_block *sb = inode->i_sb; | |
1055 | int error; | |
1056 | ||
1057 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
1058 | i->name_index, i->name, i->value, (long)i->value_len); | |
1059 | ||
617ba13b | 1060 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 1061 | /* The inode already has an extended attribute block. */ |
617ba13b | 1062 | bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
1063 | error = -EIO; |
1064 | if (!bs->bh) | |
1065 | goto cleanup; | |
1066 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", | |
1067 | atomic_read(&(bs->bh->b_count)), | |
1068 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
cc8e94fd | 1069 | if (ext4_xattr_check_block(inode, bs->bh)) { |
24676da4 TT |
1070 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1071 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 1072 | error = -EFSCORRUPTED; |
ac27a0ec DK |
1073 | goto cleanup; |
1074 | } | |
1075 | /* Find the named attribute. */ | |
1076 | bs->s.base = BHDR(bs->bh); | |
1077 | bs->s.first = BFIRST(bs->bh); | |
1078 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
1079 | bs->s.here = bs->s.first; | |
617ba13b | 1080 | error = ext4_xattr_find_entry(&bs->s.here, i->name_index, |
6ba644b9 | 1081 | i->name, 1); |
ac27a0ec DK |
1082 | if (error && error != -ENODATA) |
1083 | goto cleanup; | |
1084 | bs->s.not_found = error; | |
1085 | } | |
1086 | error = 0; | |
1087 | ||
1088 | cleanup: | |
1089 | return error; | |
1090 | } | |
1091 | ||
1092 | static int | |
617ba13b MC |
1093 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
1094 | struct ext4_xattr_info *i, | |
1095 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1096 | { |
1097 | struct super_block *sb = inode->i_sb; | |
1098 | struct buffer_head *new_bh = NULL; | |
617ba13b | 1099 | struct ext4_xattr_search *s = &bs->s; |
7a2508e1 | 1100 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 1101 | int error = 0; |
7a2508e1 | 1102 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec | 1103 | |
617ba13b | 1104 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec | 1105 | |
ac27a0ec | 1106 | if (s->base) { |
5d601255 | 1107 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
1108 | error = ext4_journal_get_write_access(handle, bs->bh); |
1109 | if (error) | |
1110 | goto cleanup; | |
1111 | lock_buffer(bs->bh); | |
1112 | ||
ac27a0ec | 1113 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
1114 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
1115 | ||
1116 | /* | |
1117 | * This must happen under buffer lock for | |
1118 | * ext4_xattr_block_set() to reliably detect modified | |
1119 | * block | |
1120 | */ | |
7a2508e1 JK |
1121 | mb_cache_entry_delete_block(ext4_mb_cache, hash, |
1122 | bs->bh->b_blocknr); | |
ac27a0ec | 1123 | ea_bdebug(bs->bh, "modifying in-place"); |
e50e5129 | 1124 | error = ext4_xattr_set_entry(i, s, handle, inode); |
ac27a0ec DK |
1125 | if (!error) { |
1126 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 1127 | ext4_xattr_rehash(header(s->base), |
ac27a0ec | 1128 | s->here); |
9c191f70 M |
1129 | ext4_xattr_cache_insert(ext4_mb_cache, |
1130 | bs->bh); | |
ac27a0ec | 1131 | } |
dac7a4b4 | 1132 | ext4_xattr_block_csum_set(inode, bs->bh); |
ac27a0ec | 1133 | unlock_buffer(bs->bh); |
6a797d27 | 1134 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1135 | goto bad_block; |
1136 | if (!error) | |
dac7a4b4 TT |
1137 | error = ext4_handle_dirty_metadata(handle, |
1138 | inode, | |
1139 | bs->bh); | |
ac27a0ec DK |
1140 | if (error) |
1141 | goto cleanup; | |
1142 | goto inserted; | |
1143 | } else { | |
1144 | int offset = (char *)s->here - bs->bh->b_data; | |
1145 | ||
8a2bfdcb | 1146 | unlock_buffer(bs->bh); |
ac27a0ec | 1147 | ea_bdebug(bs->bh, "cloning"); |
216553c4 | 1148 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
1149 | error = -ENOMEM; |
1150 | if (s->base == NULL) | |
1151 | goto cleanup; | |
1152 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
1153 | s->first = ENTRY(header(s->base)+1); | |
1154 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1155 | s->here = ENTRY(s->base + offset); | |
1156 | s->end = s->base + bs->bh->b_size; | |
1157 | } | |
1158 | } else { | |
1159 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 1160 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
1161 | /* assert(header == s->base) */ |
1162 | error = -ENOMEM; | |
1163 | if (s->base == NULL) | |
1164 | goto cleanup; | |
617ba13b | 1165 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
1166 | header(s->base)->h_blocks = cpu_to_le32(1); |
1167 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1168 | s->first = ENTRY(header(s->base)+1); | |
1169 | s->here = ENTRY(header(s->base)+1); | |
1170 | s->end = s->base + sb->s_blocksize; | |
1171 | } | |
1172 | ||
e50e5129 | 1173 | error = ext4_xattr_set_entry(i, s, handle, inode); |
6a797d27 | 1174 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1175 | goto bad_block; |
1176 | if (error) | |
1177 | goto cleanup; | |
1178 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 1179 | ext4_xattr_rehash(header(s->base), s->here); |
ac27a0ec DK |
1180 | |
1181 | inserted: | |
1182 | if (!IS_LAST_ENTRY(s->first)) { | |
617ba13b | 1183 | new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); |
ac27a0ec DK |
1184 | if (new_bh) { |
1185 | /* We found an identical block in the cache. */ | |
1186 | if (new_bh == bs->bh) | |
1187 | ea_bdebug(new_bh, "keeping"); | |
1188 | else { | |
6048c64b AG |
1189 | u32 ref; |
1190 | ||
b8cb5a54 TE |
1191 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
1192 | ||
ac27a0ec DK |
1193 | /* The old block is released after updating |
1194 | the inode. */ | |
1231b3a1 LC |
1195 | error = dquot_alloc_block(inode, |
1196 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 1197 | if (error) |
ac27a0ec | 1198 | goto cleanup; |
5d601255 | 1199 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 1200 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
1201 | new_bh); |
1202 | if (error) | |
1203 | goto cleanup_dquot; | |
1204 | lock_buffer(new_bh); | |
82939d79 JK |
1205 | /* |
1206 | * We have to be careful about races with | |
6048c64b AG |
1207 | * freeing, rehashing or adding references to |
1208 | * xattr block. Once we hold buffer lock xattr | |
1209 | * block's state is stable so we can check | |
1210 | * whether the block got freed / rehashed or | |
1211 | * not. Since we unhash mbcache entry under | |
1212 | * buffer lock when freeing / rehashing xattr | |
1213 | * block, checking whether entry is still | |
1214 | * hashed is reliable. Same rules hold for | |
1215 | * e_reusable handling. | |
82939d79 | 1216 | */ |
6048c64b AG |
1217 | if (hlist_bl_unhashed(&ce->e_hash_list) || |
1218 | !ce->e_reusable) { | |
82939d79 JK |
1219 | /* |
1220 | * Undo everything and check mbcache | |
1221 | * again. | |
1222 | */ | |
1223 | unlock_buffer(new_bh); | |
1224 | dquot_free_block(inode, | |
1225 | EXT4_C2B(EXT4_SB(sb), | |
1226 | 1)); | |
1227 | brelse(new_bh); | |
7a2508e1 | 1228 | mb_cache_entry_put(ext4_mb_cache, ce); |
82939d79 JK |
1229 | ce = NULL; |
1230 | new_bh = NULL; | |
1231 | goto inserted; | |
1232 | } | |
6048c64b AG |
1233 | ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
1234 | BHDR(new_bh)->h_refcount = cpu_to_le32(ref); | |
1235 | if (ref >= EXT4_XATTR_REFCOUNT_MAX) | |
1236 | ce->e_reusable = 0; | |
ac27a0ec | 1237 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
6048c64b | 1238 | ref); |
dac7a4b4 | 1239 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec | 1240 | unlock_buffer(new_bh); |
dac7a4b4 TT |
1241 | error = ext4_handle_dirty_metadata(handle, |
1242 | inode, | |
1243 | new_bh); | |
ac27a0ec DK |
1244 | if (error) |
1245 | goto cleanup_dquot; | |
1246 | } | |
7a2508e1 JK |
1247 | mb_cache_entry_touch(ext4_mb_cache, ce); |
1248 | mb_cache_entry_put(ext4_mb_cache, ce); | |
ac27a0ec DK |
1249 | ce = NULL; |
1250 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
1251 | /* We were modifying this block in-place. */ | |
1252 | ea_bdebug(bs->bh, "keeping this block"); | |
1253 | new_bh = bs->bh; | |
1254 | get_bh(new_bh); | |
1255 | } else { | |
1256 | /* We need to allocate a new block */ | |
fb0a387d ES |
1257 | ext4_fsblk_t goal, block; |
1258 | ||
b8cb5a54 TE |
1259 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
1260 | ||
fb0a387d | 1261 | goal = ext4_group_first_block_no(sb, |
d00a6d7b | 1262 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
1263 | |
1264 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 1265 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
1266 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
1267 | ||
55f020db AH |
1268 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
1269 | NULL, &error); | |
ac27a0ec DK |
1270 | if (error) |
1271 | goto cleanup; | |
fb0a387d | 1272 | |
12e9b892 | 1273 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
1274 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
1275 | ||
ace36ad4 JP |
1276 | ea_idebug(inode, "creating block %llu", |
1277 | (unsigned long long)block); | |
ac27a0ec DK |
1278 | |
1279 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 1280 | if (unlikely(!new_bh)) { |
860d21e2 | 1281 | error = -ENOMEM; |
ac27a0ec | 1282 | getblk_failed: |
7dc57615 | 1283 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 1284 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
1285 | goto cleanup; |
1286 | } | |
1287 | lock_buffer(new_bh); | |
617ba13b | 1288 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
1289 | if (error) { |
1290 | unlock_buffer(new_bh); | |
860d21e2 | 1291 | error = -EIO; |
ac27a0ec DK |
1292 | goto getblk_failed; |
1293 | } | |
1294 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
dac7a4b4 | 1295 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec DK |
1296 | set_buffer_uptodate(new_bh); |
1297 | unlock_buffer(new_bh); | |
9c191f70 | 1298 | ext4_xattr_cache_insert(ext4_mb_cache, new_bh); |
dac7a4b4 TT |
1299 | error = ext4_handle_dirty_metadata(handle, inode, |
1300 | new_bh); | |
ac27a0ec DK |
1301 | if (error) |
1302 | goto cleanup; | |
1303 | } | |
1304 | } | |
1305 | ||
1306 | /* Update the inode. */ | |
617ba13b | 1307 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
1308 | |
1309 | /* Drop the previous xattr block. */ | |
1310 | if (bs->bh && bs->bh != new_bh) | |
617ba13b | 1311 | ext4_xattr_release_block(handle, inode, bs->bh); |
ac27a0ec DK |
1312 | error = 0; |
1313 | ||
1314 | cleanup: | |
1315 | if (ce) | |
7a2508e1 | 1316 | mb_cache_entry_put(ext4_mb_cache, ce); |
ac27a0ec DK |
1317 | brelse(new_bh); |
1318 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
1319 | kfree(s->base); | |
1320 | ||
1321 | return error; | |
1322 | ||
1323 | cleanup_dquot: | |
1231b3a1 | 1324 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
1325 | goto cleanup; |
1326 | ||
1327 | bad_block: | |
24676da4 TT |
1328 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1329 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1330 | goto cleanup; |
1331 | ||
1332 | #undef header | |
1333 | } | |
1334 | ||
879b3825 TM |
1335 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
1336 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 1337 | { |
617ba13b MC |
1338 | struct ext4_xattr_ibody_header *header; |
1339 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
1340 | int error; |
1341 | ||
617ba13b | 1342 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1343 | return 0; |
617ba13b | 1344 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
1345 | header = IHDR(inode, raw_inode); |
1346 | is->s.base = is->s.first = IFIRST(header); | |
1347 | is->s.here = is->s.first; | |
617ba13b | 1348 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 1349 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
9e92f48c | 1350 | error = xattr_check_inode(inode, header, is->s.end); |
ac27a0ec DK |
1351 | if (error) |
1352 | return error; | |
1353 | /* Find the named attribute. */ | |
617ba13b | 1354 | error = ext4_xattr_find_entry(&is->s.here, i->name_index, |
6ba644b9 | 1355 | i->name, 0); |
ac27a0ec DK |
1356 | if (error && error != -ENODATA) |
1357 | return error; | |
1358 | is->s.not_found = error; | |
1359 | } | |
1360 | return 0; | |
1361 | } | |
1362 | ||
0d812f77 TM |
1363 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
1364 | struct ext4_xattr_info *i, | |
1365 | struct ext4_xattr_ibody_find *is) | |
1366 | { | |
1367 | struct ext4_xattr_ibody_header *header; | |
1368 | struct ext4_xattr_search *s = &is->s; | |
1369 | int error; | |
1370 | ||
1371 | if (EXT4_I(inode)->i_extra_isize == 0) | |
1372 | return -ENOSPC; | |
e50e5129 | 1373 | error = ext4_xattr_set_entry(i, s, handle, inode); |
0d812f77 TM |
1374 | if (error) { |
1375 | if (error == -ENOSPC && | |
1376 | ext4_has_inline_data(inode)) { | |
1377 | error = ext4_try_to_evict_inline_data(handle, inode, | |
1378 | EXT4_XATTR_LEN(strlen(i->name) + | |
1379 | EXT4_XATTR_SIZE(i->value_len))); | |
1380 | if (error) | |
1381 | return error; | |
1382 | error = ext4_xattr_ibody_find(inode, i, is); | |
1383 | if (error) | |
1384 | return error; | |
e50e5129 | 1385 | error = ext4_xattr_set_entry(i, s, handle, inode); |
0d812f77 TM |
1386 | } |
1387 | if (error) | |
1388 | return error; | |
1389 | } | |
1390 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); | |
1391 | if (!IS_LAST_ENTRY(s->first)) { | |
1392 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
1393 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
1394 | } else { | |
1395 | header->h_magic = cpu_to_le32(0); | |
1396 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
1397 | } | |
1398 | return 0; | |
1399 | } | |
1400 | ||
e50e5129 | 1401 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, |
0d812f77 TM |
1402 | struct ext4_xattr_info *i, |
1403 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 1404 | { |
617ba13b MC |
1405 | struct ext4_xattr_ibody_header *header; |
1406 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
1407 | int error; |
1408 | ||
617ba13b | 1409 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1410 | return -ENOSPC; |
e50e5129 | 1411 | error = ext4_xattr_set_entry(i, s, handle, inode); |
ac27a0ec DK |
1412 | if (error) |
1413 | return error; | |
617ba13b | 1414 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 1415 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 1416 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 1417 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1418 | } else { |
1419 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 1420 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1421 | } |
1422 | return 0; | |
1423 | } | |
1424 | ||
3fd16462 JK |
1425 | static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
1426 | struct ext4_xattr_info *i) | |
1427 | { | |
1428 | void *value; | |
1429 | ||
1430 | if (le32_to_cpu(s->here->e_value_size) != i->value_len) | |
1431 | return 0; | |
1432 | value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); | |
1433 | return !memcmp(value, i->value, i->value_len); | |
1434 | } | |
1435 | ||
ac27a0ec | 1436 | /* |
617ba13b | 1437 | * ext4_xattr_set_handle() |
ac27a0ec | 1438 | * |
6e9510b0 | 1439 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
1440 | * is NULL to remove an existing extended attribute, and non-NULL to |
1441 | * either replace an existing extended attribute, or create a new extended | |
1442 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
1443 | * specify that an extended attribute must exist and must not exist | |
1444 | * previous to the call, respectively. | |
1445 | * | |
1446 | * Returns 0, or a negative error number on failure. | |
1447 | */ | |
1448 | int | |
617ba13b | 1449 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
1450 | const char *name, const void *value, size_t value_len, |
1451 | int flags) | |
1452 | { | |
617ba13b | 1453 | struct ext4_xattr_info i = { |
ac27a0ec DK |
1454 | .name_index = name_index, |
1455 | .name = name, | |
1456 | .value = value, | |
1457 | .value_len = value_len, | |
e50e5129 | 1458 | .in_inode = 0, |
ac27a0ec | 1459 | }; |
617ba13b | 1460 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
1461 | .s = { .not_found = -ENODATA, }, |
1462 | }; | |
617ba13b | 1463 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
1464 | .s = { .not_found = -ENODATA, }, |
1465 | }; | |
c755e251 | 1466 | int no_expand; |
ac27a0ec DK |
1467 | int error; |
1468 | ||
1469 | if (!name) | |
1470 | return -EINVAL; | |
1471 | if (strlen(name) > 255) | |
1472 | return -ERANGE; | |
b8cb5a54 | 1473 | |
c755e251 | 1474 | ext4_write_lock_xattr(inode, &no_expand); |
4d20c685 | 1475 | |
66543617 | 1476 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
1477 | if (error) |
1478 | goto cleanup; | |
1479 | ||
19f5fb7a | 1480 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
1481 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
1482 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 1483 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
1484 | } |
1485 | ||
617ba13b | 1486 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
1487 | if (error) |
1488 | goto cleanup; | |
1489 | if (is.s.not_found) | |
617ba13b | 1490 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
1491 | if (error) |
1492 | goto cleanup; | |
1493 | if (is.s.not_found && bs.s.not_found) { | |
1494 | error = -ENODATA; | |
1495 | if (flags & XATTR_REPLACE) | |
1496 | goto cleanup; | |
1497 | error = 0; | |
1498 | if (!value) | |
1499 | goto cleanup; | |
1500 | } else { | |
1501 | error = -EEXIST; | |
1502 | if (flags & XATTR_CREATE) | |
1503 | goto cleanup; | |
1504 | } | |
ac27a0ec DK |
1505 | if (!value) { |
1506 | if (!is.s.not_found) | |
e50e5129 | 1507 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 1508 | else if (!bs.s.not_found) |
617ba13b | 1509 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1510 | } else { |
3fd16462 JK |
1511 | error = 0; |
1512 | /* Xattr value did not change? Save us some work and bail out */ | |
1513 | if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) | |
1514 | goto cleanup; | |
1515 | if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) | |
1516 | goto cleanup; | |
1517 | ||
e50e5129 | 1518 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
1519 | if (!error && !bs.s.not_found) { |
1520 | i.value = NULL; | |
617ba13b | 1521 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1522 | } else if (error == -ENOSPC) { |
7e01c8e5 TY |
1523 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
1524 | error = ext4_xattr_block_find(inode, &i, &bs); | |
1525 | if (error) | |
1526 | goto cleanup; | |
1527 | } | |
617ba13b | 1528 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
e50e5129 AD |
1529 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
1530 | error == -ENOSPC) { | |
1531 | /* xattr not fit to block, store at external | |
1532 | * inode */ | |
1533 | i.in_inode = 1; | |
1534 | error = ext4_xattr_ibody_set(handle, inode, | |
1535 | &i, &is); | |
1536 | } | |
ac27a0ec DK |
1537 | if (error) |
1538 | goto cleanup; | |
1539 | if (!is.s.not_found) { | |
1540 | i.value = NULL; | |
e50e5129 AD |
1541 | error = ext4_xattr_ibody_set(handle, inode, &i, |
1542 | &is); | |
ac27a0ec DK |
1543 | } |
1544 | } | |
1545 | } | |
1546 | if (!error) { | |
617ba13b | 1547 | ext4_xattr_update_super_block(handle, inode->i_sb); |
eeca7ea1 | 1548 | inode->i_ctime = current_time(inode); |
6dd4ee7c | 1549 | if (!value) |
c755e251 | 1550 | no_expand = 0; |
617ba13b | 1551 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 1552 | /* |
617ba13b | 1553 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
1554 | * error != 0. |
1555 | */ | |
1556 | is.iloc.bh = NULL; | |
1557 | if (IS_SYNC(inode)) | |
0390131b | 1558 | ext4_handle_sync(handle); |
ac27a0ec DK |
1559 | } |
1560 | ||
1561 | cleanup: | |
1562 | brelse(is.iloc.bh); | |
1563 | brelse(bs.bh); | |
c755e251 | 1564 | ext4_write_unlock_xattr(inode, &no_expand); |
ac27a0ec DK |
1565 | return error; |
1566 | } | |
1567 | ||
1568 | /* | |
617ba13b | 1569 | * ext4_xattr_set() |
ac27a0ec | 1570 | * |
617ba13b | 1571 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
1572 | * attribute modification is a filesystem transaction by itself. |
1573 | * | |
1574 | * Returns 0, or a negative error number on failure. | |
1575 | */ | |
1576 | int | |
617ba13b | 1577 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
1578 | const void *value, size_t value_len, int flags) |
1579 | { | |
1580 | handle_t *handle; | |
e50e5129 | 1581 | struct super_block *sb = inode->i_sb; |
ac27a0ec | 1582 | int error, retries = 0; |
95eaefbd | 1583 | int credits = ext4_jbd2_credits_xattr(inode); |
ac27a0ec | 1584 | |
b8cb5a54 TE |
1585 | error = dquot_initialize(inode); |
1586 | if (error) | |
1587 | return error; | |
e50e5129 AD |
1588 | |
1589 | if ((value_len >= EXT4_XATTR_MIN_LARGE_EA_SIZE(sb->s_blocksize)) && | |
1590 | ext4_has_feature_ea_inode(sb)) { | |
1591 | int nrblocks = (value_len + sb->s_blocksize - 1) >> | |
1592 | sb->s_blocksize_bits; | |
1593 | ||
1594 | /* For new inode */ | |
1595 | credits += EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + 3; | |
1596 | ||
1597 | /* For data blocks of EA inode */ | |
1598 | credits += ext4_meta_trans_blocks(inode, nrblocks, 0); | |
1599 | } | |
1600 | ||
ac27a0ec | 1601 | retry: |
9924a92a | 1602 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
1603 | if (IS_ERR(handle)) { |
1604 | error = PTR_ERR(handle); | |
1605 | } else { | |
1606 | int error2; | |
1607 | ||
617ba13b | 1608 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 1609 | value, value_len, flags); |
617ba13b | 1610 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 1611 | if (error == -ENOSPC && |
e50e5129 | 1612 | ext4_should_retry_alloc(sb, &retries)) |
ac27a0ec DK |
1613 | goto retry; |
1614 | if (error == 0) | |
1615 | error = error2; | |
1616 | } | |
1617 | ||
1618 | return error; | |
1619 | } | |
1620 | ||
6dd4ee7c KS |
1621 | /* |
1622 | * Shift the EA entries in the inode to create space for the increased | |
1623 | * i_extra_isize. | |
1624 | */ | |
1625 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
1626 | int value_offs_shift, void *to, | |
94405713 | 1627 | void *from, size_t n) |
6dd4ee7c KS |
1628 | { |
1629 | struct ext4_xattr_entry *last = entry; | |
1630 | int new_offs; | |
1631 | ||
94405713 JK |
1632 | /* We always shift xattr headers further thus offsets get lower */ |
1633 | BUG_ON(value_offs_shift > 0); | |
1634 | ||
6dd4ee7c KS |
1635 | /* Adjust the value offsets of the entries */ |
1636 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 1637 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
1638 | new_offs = le16_to_cpu(last->e_value_offs) + |
1639 | value_offs_shift; | |
6dd4ee7c KS |
1640 | last->e_value_offs = cpu_to_le16(new_offs); |
1641 | } | |
1642 | } | |
1643 | /* Shift the entries by n bytes */ | |
1644 | memmove(to, from, n); | |
1645 | } | |
1646 | ||
3f2571c1 JK |
1647 | /* |
1648 | * Move xattr pointed to by 'entry' from inode into external xattr block | |
1649 | */ | |
1650 | static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, | |
1651 | struct ext4_inode *raw_inode, | |
1652 | struct ext4_xattr_entry *entry) | |
1653 | { | |
1654 | struct ext4_xattr_ibody_find *is = NULL; | |
1655 | struct ext4_xattr_block_find *bs = NULL; | |
1656 | char *buffer = NULL, *b_entry_name = NULL; | |
1657 | size_t value_offs, value_size; | |
1658 | struct ext4_xattr_info i = { | |
1659 | .value = NULL, | |
1660 | .value_len = 0, | |
1661 | .name_index = entry->e_name_index, | |
1662 | }; | |
1663 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
1664 | int error; | |
1665 | ||
1666 | value_offs = le16_to_cpu(entry->e_value_offs); | |
1667 | value_size = le32_to_cpu(entry->e_value_size); | |
1668 | ||
1669 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); | |
1670 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
1671 | buffer = kmalloc(value_size, GFP_NOFS); | |
1672 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
1673 | if (!is || !bs || !buffer || !b_entry_name) { | |
1674 | error = -ENOMEM; | |
1675 | goto out; | |
1676 | } | |
1677 | ||
1678 | is->s.not_found = -ENODATA; | |
1679 | bs->s.not_found = -ENODATA; | |
1680 | is->iloc.bh = NULL; | |
1681 | bs->bh = NULL; | |
1682 | ||
1683 | /* Save the entry name and the entry value */ | |
1684 | memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); | |
1685 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); | |
1686 | b_entry_name[entry->e_name_len] = '\0'; | |
1687 | i.name = b_entry_name; | |
1688 | ||
1689 | error = ext4_get_inode_loc(inode, &is->iloc); | |
1690 | if (error) | |
1691 | goto out; | |
1692 | ||
1693 | error = ext4_xattr_ibody_find(inode, &i, is); | |
1694 | if (error) | |
1695 | goto out; | |
1696 | ||
1697 | /* Remove the chosen entry from the inode */ | |
e50e5129 | 1698 | error = ext4_xattr_ibody_set(handle, inode, &i, is); |
3f2571c1 JK |
1699 | if (error) |
1700 | goto out; | |
1701 | ||
1702 | i.name = b_entry_name; | |
1703 | i.value = buffer; | |
1704 | i.value_len = value_size; | |
1705 | error = ext4_xattr_block_find(inode, &i, bs); | |
1706 | if (error) | |
1707 | goto out; | |
1708 | ||
1709 | /* Add entry which was removed from the inode into the block */ | |
1710 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
1711 | if (error) | |
1712 | goto out; | |
1713 | error = 0; | |
1714 | out: | |
1715 | kfree(b_entry_name); | |
1716 | kfree(buffer); | |
1717 | if (is) | |
1718 | brelse(is->iloc.bh); | |
1719 | kfree(is); | |
1720 | kfree(bs); | |
1721 | ||
1722 | return error; | |
1723 | } | |
1724 | ||
dfa2064b JK |
1725 | static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, |
1726 | struct ext4_inode *raw_inode, | |
1727 | int isize_diff, size_t ifree, | |
1728 | size_t bfree, int *total_ino) | |
1729 | { | |
1730 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
1731 | struct ext4_xattr_entry *small_entry; | |
1732 | struct ext4_xattr_entry *entry; | |
1733 | struct ext4_xattr_entry *last; | |
1734 | unsigned int entry_size; /* EA entry size */ | |
1735 | unsigned int total_size; /* EA entry size + value size */ | |
1736 | unsigned int min_total_size; | |
1737 | int error; | |
1738 | ||
1739 | while (isize_diff > ifree) { | |
1740 | entry = NULL; | |
1741 | small_entry = NULL; | |
1742 | min_total_size = ~0U; | |
1743 | last = IFIRST(header); | |
1744 | /* Find the entry best suited to be pushed into EA block */ | |
1745 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1746 | total_size = | |
1747 | EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + | |
1748 | EXT4_XATTR_LEN(last->e_name_len); | |
1749 | if (total_size <= bfree && | |
1750 | total_size < min_total_size) { | |
1751 | if (total_size + ifree < isize_diff) { | |
1752 | small_entry = last; | |
1753 | } else { | |
1754 | entry = last; | |
1755 | min_total_size = total_size; | |
1756 | } | |
1757 | } | |
1758 | } | |
1759 | ||
1760 | if (entry == NULL) { | |
1761 | if (small_entry == NULL) | |
1762 | return -ENOSPC; | |
1763 | entry = small_entry; | |
1764 | } | |
1765 | ||
1766 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
1767 | total_size = entry_size + | |
1768 | EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)); | |
1769 | error = ext4_xattr_move_to_block(handle, inode, raw_inode, | |
1770 | entry); | |
1771 | if (error) | |
1772 | return error; | |
1773 | ||
1774 | *total_ino -= entry_size; | |
1775 | ifree += total_size; | |
1776 | bfree -= total_size; | |
1777 | } | |
1778 | ||
1779 | return 0; | |
1780 | } | |
1781 | ||
6dd4ee7c KS |
1782 | /* |
1783 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
1784 | * Returns 0 on success or negative error number on failure. | |
1785 | */ | |
1786 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
1787 | struct ext4_inode *raw_inode, handle_t *handle) | |
1788 | { | |
1789 | struct ext4_xattr_ibody_header *header; | |
6dd4ee7c | 1790 | struct buffer_head *bh = NULL; |
e3014d14 JK |
1791 | size_t min_offs; |
1792 | size_t ifree, bfree; | |
7b1b2c1b | 1793 | int total_ino; |
6e0cd088 | 1794 | void *base, *end; |
d0141191 | 1795 | int error = 0, tried_min_extra_isize = 0; |
ac39849d | 1796 | int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); |
d0141191 | 1797 | int isize_diff; /* How much do we need to grow i_extra_isize */ |
c755e251 TT |
1798 | int no_expand; |
1799 | ||
1800 | if (ext4_write_trylock_xattr(inode, &no_expand) == 0) | |
1801 | return 0; | |
6dd4ee7c | 1802 | |
6dd4ee7c | 1803 | retry: |
d0141191 | 1804 | isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; |
2e81a4ee JK |
1805 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) |
1806 | goto out; | |
6dd4ee7c KS |
1807 | |
1808 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
1809 | |
1810 | /* | |
1811 | * Check if enough free space is available in the inode to shift the | |
1812 | * entries ahead by new_extra_isize. | |
1813 | */ | |
1814 | ||
6e0cd088 | 1815 | base = IFIRST(header); |
6dd4ee7c KS |
1816 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
1817 | min_offs = end - base; | |
6dd4ee7c KS |
1818 | total_ino = sizeof(struct ext4_xattr_ibody_header); |
1819 | ||
9e92f48c TT |
1820 | error = xattr_check_inode(inode, header, end); |
1821 | if (error) | |
1822 | goto cleanup; | |
1823 | ||
6e0cd088 | 1824 | ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); |
e3014d14 JK |
1825 | if (ifree >= isize_diff) |
1826 | goto shift; | |
6dd4ee7c KS |
1827 | |
1828 | /* | |
1829 | * Enough free space isn't available in the inode, check if | |
1830 | * EA block can hold new_extra_isize bytes. | |
1831 | */ | |
1832 | if (EXT4_I(inode)->i_file_acl) { | |
1833 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
1834 | error = -EIO; | |
1835 | if (!bh) | |
1836 | goto cleanup; | |
cc8e94fd | 1837 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
1838 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1839 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 1840 | error = -EFSCORRUPTED; |
6dd4ee7c KS |
1841 | goto cleanup; |
1842 | } | |
1843 | base = BHDR(bh); | |
6dd4ee7c KS |
1844 | end = bh->b_data + bh->b_size; |
1845 | min_offs = end - base; | |
6e0cd088 JK |
1846 | bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, |
1847 | NULL); | |
e3014d14 | 1848 | if (bfree + ifree < isize_diff) { |
6dd4ee7c KS |
1849 | if (!tried_min_extra_isize && s_min_extra_isize) { |
1850 | tried_min_extra_isize++; | |
1851 | new_extra_isize = s_min_extra_isize; | |
1852 | brelse(bh); | |
1853 | goto retry; | |
1854 | } | |
dfa2064b | 1855 | error = -ENOSPC; |
6dd4ee7c KS |
1856 | goto cleanup; |
1857 | } | |
1858 | } else { | |
e3014d14 | 1859 | bfree = inode->i_sb->s_blocksize; |
6dd4ee7c KS |
1860 | } |
1861 | ||
dfa2064b JK |
1862 | error = ext4_xattr_make_inode_space(handle, inode, raw_inode, |
1863 | isize_diff, ifree, bfree, | |
1864 | &total_ino); | |
1865 | if (error) { | |
1866 | if (error == -ENOSPC && !tried_min_extra_isize && | |
1867 | s_min_extra_isize) { | |
1868 | tried_min_extra_isize++; | |
1869 | new_extra_isize = s_min_extra_isize; | |
1870 | brelse(bh); | |
1871 | goto retry; | |
6dd4ee7c | 1872 | } |
dfa2064b | 1873 | goto cleanup; |
6dd4ee7c | 1874 | } |
e3014d14 JK |
1875 | shift: |
1876 | /* Adjust the offsets and shift the remaining entries ahead */ | |
6e0cd088 | 1877 | ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize |
e3014d14 JK |
1878 | - new_extra_isize, (void *)raw_inode + |
1879 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
94405713 | 1880 | (void *)header, total_ino); |
e3014d14 | 1881 | EXT4_I(inode)->i_extra_isize = new_extra_isize; |
6dd4ee7c | 1882 | brelse(bh); |
2e81a4ee | 1883 | out: |
c755e251 | 1884 | ext4_write_unlock_xattr(inode, &no_expand); |
6dd4ee7c KS |
1885 | return 0; |
1886 | ||
1887 | cleanup: | |
6dd4ee7c | 1888 | brelse(bh); |
2e81a4ee | 1889 | /* |
c755e251 | 1890 | * Inode size expansion failed; don't try again |
2e81a4ee | 1891 | */ |
c755e251 TT |
1892 | no_expand = 1; |
1893 | ext4_write_unlock_xattr(inode, &no_expand); | |
6dd4ee7c KS |
1894 | return error; |
1895 | } | |
1896 | ||
1897 | ||
e50e5129 AD |
1898 | #define EIA_INCR 16 /* must be 2^n */ |
1899 | #define EIA_MASK (EIA_INCR - 1) | |
1900 | /* Add the large xattr @ino into @lea_ino_array for later deletion. | |
1901 | * If @lea_ino_array is new or full it will be grown and the old | |
1902 | * contents copied over. | |
1903 | */ | |
1904 | static int | |
1905 | ext4_expand_ino_array(struct ext4_xattr_ino_array **lea_ino_array, __u32 ino) | |
1906 | { | |
1907 | if (*lea_ino_array == NULL) { | |
1908 | /* | |
1909 | * Start with 15 inodes, so it fits into a power-of-two size. | |
1910 | * If *lea_ino_array is NULL, this is essentially offsetof() | |
1911 | */ | |
1912 | (*lea_ino_array) = | |
1913 | kmalloc(offsetof(struct ext4_xattr_ino_array, | |
1914 | xia_inodes[EIA_MASK]), | |
1915 | GFP_NOFS); | |
1916 | if (*lea_ino_array == NULL) | |
1917 | return -ENOMEM; | |
1918 | (*lea_ino_array)->xia_count = 0; | |
1919 | } else if (((*lea_ino_array)->xia_count & EIA_MASK) == EIA_MASK) { | |
1920 | /* expand the array once all 15 + n * 16 slots are full */ | |
1921 | struct ext4_xattr_ino_array *new_array = NULL; | |
1922 | int count = (*lea_ino_array)->xia_count; | |
1923 | ||
1924 | /* if new_array is NULL, this is essentially offsetof() */ | |
1925 | new_array = kmalloc( | |
1926 | offsetof(struct ext4_xattr_ino_array, | |
1927 | xia_inodes[count + EIA_INCR]), | |
1928 | GFP_NOFS); | |
1929 | if (new_array == NULL) | |
1930 | return -ENOMEM; | |
1931 | memcpy(new_array, *lea_ino_array, | |
1932 | offsetof(struct ext4_xattr_ino_array, | |
1933 | xia_inodes[count])); | |
1934 | kfree(*lea_ino_array); | |
1935 | *lea_ino_array = new_array; | |
1936 | } | |
1937 | (*lea_ino_array)->xia_inodes[(*lea_ino_array)->xia_count++] = ino; | |
1938 | return 0; | |
1939 | } | |
1940 | ||
1941 | /** | |
1942 | * Add xattr inode to orphan list | |
1943 | */ | |
1944 | static int | |
1945 | ext4_xattr_inode_orphan_add(handle_t *handle, struct inode *inode, | |
1946 | int credits, struct ext4_xattr_ino_array *lea_ino_array) | |
1947 | { | |
1948 | struct inode *ea_inode = NULL; | |
1949 | int idx = 0, error = 0; | |
1950 | ||
1951 | if (lea_ino_array == NULL) | |
1952 | return 0; | |
1953 | ||
1954 | for (; idx < lea_ino_array->xia_count; ++idx) { | |
1955 | if (!ext4_handle_has_enough_credits(handle, credits)) { | |
1956 | error = ext4_journal_extend(handle, credits); | |
1957 | if (error > 0) | |
1958 | error = ext4_journal_restart(handle, credits); | |
1959 | ||
1960 | if (error != 0) { | |
1961 | ext4_warning(inode->i_sb, | |
1962 | "couldn't extend journal " | |
1963 | "(err %d)", error); | |
1964 | return error; | |
1965 | } | |
1966 | } | |
1967 | ea_inode = ext4_xattr_inode_iget(inode, | |
1968 | lea_ino_array->xia_inodes[idx], &error); | |
1969 | if (error) | |
1970 | continue; | |
0de5983d | 1971 | inode_lock(ea_inode); |
e50e5129 | 1972 | ext4_orphan_add(handle, ea_inode); |
0de5983d | 1973 | inode_unlock(ea_inode); |
e50e5129 AD |
1974 | /* the inode's i_count will be released by caller */ |
1975 | } | |
1976 | ||
1977 | return 0; | |
1978 | } | |
6dd4ee7c | 1979 | |
ac27a0ec | 1980 | /* |
617ba13b | 1981 | * ext4_xattr_delete_inode() |
ac27a0ec | 1982 | * |
e50e5129 AD |
1983 | * Free extended attribute resources associated with this inode. Traverse |
1984 | * all entries and unlink any xattr inodes associated with this inode. This | |
ac27a0ec | 1985 | * is called immediately before an inode is freed. We have exclusive |
e50e5129 AD |
1986 | * access to the inode. If an orphan inode is deleted it will also delete any |
1987 | * xattr block and all xattr inodes. They are checked by ext4_xattr_inode_iget() | |
1988 | * to ensure they belong to the parent inode and were not deleted already. | |
ac27a0ec | 1989 | */ |
e50e5129 AD |
1990 | int |
1991 | ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, | |
1992 | struct ext4_xattr_ino_array **lea_ino_array) | |
ac27a0ec DK |
1993 | { |
1994 | struct buffer_head *bh = NULL; | |
e50e5129 AD |
1995 | struct ext4_xattr_ibody_header *header; |
1996 | struct ext4_inode *raw_inode; | |
1997 | struct ext4_iloc iloc; | |
1998 | struct ext4_xattr_entry *entry; | |
1999 | int credits = 3, error = 0; | |
ac27a0ec | 2000 | |
e50e5129 AD |
2001 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
2002 | goto delete_external_ea; | |
2003 | ||
2004 | error = ext4_get_inode_loc(inode, &iloc); | |
2005 | if (error) | |
2006 | goto cleanup; | |
2007 | raw_inode = ext4_raw_inode(&iloc); | |
2008 | header = IHDR(inode, raw_inode); | |
2009 | for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); | |
2010 | entry = EXT4_XATTR_NEXT(entry)) { | |
2011 | if (!entry->e_value_inum) | |
2012 | continue; | |
2013 | if (ext4_expand_ino_array(lea_ino_array, | |
2014 | entry->e_value_inum) != 0) { | |
2015 | brelse(iloc.bh); | |
2016 | goto cleanup; | |
2017 | } | |
2018 | entry->e_value_inum = 0; | |
2019 | } | |
2020 | brelse(iloc.bh); | |
2021 | ||
2022 | delete_external_ea: | |
2023 | if (!EXT4_I(inode)->i_file_acl) { | |
2024 | /* add xattr inode to orphan list */ | |
2025 | ext4_xattr_inode_orphan_add(handle, inode, credits, | |
2026 | *lea_ino_array); | |
ac27a0ec | 2027 | goto cleanup; |
e50e5129 | 2028 | } |
617ba13b | 2029 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec | 2030 | if (!bh) { |
24676da4 TT |
2031 | EXT4_ERROR_INODE(inode, "block %llu read error", |
2032 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
2033 | goto cleanup; |
2034 | } | |
617ba13b | 2035 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 2036 | BHDR(bh)->h_blocks != cpu_to_le32(1)) { |
24676da4 TT |
2037 | EXT4_ERROR_INODE(inode, "bad block %llu", |
2038 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
2039 | goto cleanup; |
2040 | } | |
e50e5129 AD |
2041 | |
2042 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
2043 | entry = EXT4_XATTR_NEXT(entry)) { | |
2044 | if (!entry->e_value_inum) | |
2045 | continue; | |
2046 | if (ext4_expand_ino_array(lea_ino_array, | |
2047 | entry->e_value_inum) != 0) | |
2048 | goto cleanup; | |
2049 | entry->e_value_inum = 0; | |
2050 | } | |
2051 | ||
2052 | /* add xattr inode to orphan list */ | |
2053 | error = ext4_xattr_inode_orphan_add(handle, inode, credits, | |
2054 | *lea_ino_array); | |
2055 | if (error != 0) | |
2056 | goto cleanup; | |
2057 | ||
2058 | if (!IS_NOQUOTA(inode)) | |
2059 | credits += 2 * EXT4_QUOTA_DEL_BLOCKS(inode->i_sb); | |
2060 | ||
2061 | if (!ext4_handle_has_enough_credits(handle, credits)) { | |
2062 | error = ext4_journal_extend(handle, credits); | |
2063 | if (error > 0) | |
2064 | error = ext4_journal_restart(handle, credits); | |
2065 | if (error != 0) { | |
2066 | ext4_warning(inode->i_sb, | |
2067 | "couldn't extend journal (err %d)", error); | |
2068 | goto cleanup; | |
2069 | } | |
2070 | } | |
2071 | ||
617ba13b MC |
2072 | ext4_xattr_release_block(handle, inode, bh); |
2073 | EXT4_I(inode)->i_file_acl = 0; | |
ac27a0ec DK |
2074 | |
2075 | cleanup: | |
2076 | brelse(bh); | |
e50e5129 AD |
2077 | |
2078 | return error; | |
2079 | } | |
2080 | ||
2081 | void | |
2082 | ext4_xattr_inode_array_free(struct inode *inode, | |
2083 | struct ext4_xattr_ino_array *lea_ino_array) | |
2084 | { | |
2085 | struct inode *ea_inode = NULL; | |
2086 | int idx = 0; | |
2087 | int err; | |
2088 | ||
2089 | if (lea_ino_array == NULL) | |
2090 | return; | |
2091 | ||
2092 | for (; idx < lea_ino_array->xia_count; ++idx) { | |
2093 | ea_inode = ext4_xattr_inode_iget(inode, | |
2094 | lea_ino_array->xia_inodes[idx], &err); | |
2095 | if (err) | |
2096 | continue; | |
2097 | /* for inode's i_count get from ext4_xattr_delete_inode */ | |
2098 | if (!list_empty(&EXT4_I(ea_inode)->i_orphan)) | |
2099 | iput(ea_inode); | |
2100 | clear_nlink(ea_inode); | |
2101 | iput(ea_inode); | |
2102 | } | |
2103 | kfree(lea_ino_array); | |
ac27a0ec DK |
2104 | } |
2105 | ||
ac27a0ec | 2106 | /* |
617ba13b | 2107 | * ext4_xattr_cache_insert() |
ac27a0ec DK |
2108 | * |
2109 | * Create a new entry in the extended attribute cache, and insert | |
2110 | * it unless such an entry is already in the cache. | |
2111 | * | |
2112 | * Returns 0, or a negative error number on failure. | |
2113 | */ | |
2114 | static void | |
7a2508e1 | 2115 | ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) |
ac27a0ec | 2116 | { |
6048c64b AG |
2117 | struct ext4_xattr_header *header = BHDR(bh); |
2118 | __u32 hash = le32_to_cpu(header->h_hash); | |
2119 | int reusable = le32_to_cpu(header->h_refcount) < | |
2120 | EXT4_XATTR_REFCOUNT_MAX; | |
ac27a0ec DK |
2121 | int error; |
2122 | ||
7a2508e1 | 2123 | error = mb_cache_entry_create(ext4_mb_cache, GFP_NOFS, hash, |
6048c64b | 2124 | bh->b_blocknr, reusable); |
ac27a0ec | 2125 | if (error) { |
82939d79 | 2126 | if (error == -EBUSY) |
ac27a0ec | 2127 | ea_bdebug(bh, "already in cache"); |
82939d79 | 2128 | } else |
ac27a0ec | 2129 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
2130 | } |
2131 | ||
2132 | /* | |
617ba13b | 2133 | * ext4_xattr_cmp() |
ac27a0ec DK |
2134 | * |
2135 | * Compare two extended attribute blocks for equality. | |
2136 | * | |
2137 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
2138 | * a negative error number on errors. | |
2139 | */ | |
2140 | static int | |
617ba13b MC |
2141 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
2142 | struct ext4_xattr_header *header2) | |
ac27a0ec | 2143 | { |
617ba13b | 2144 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
2145 | |
2146 | entry1 = ENTRY(header1+1); | |
2147 | entry2 = ENTRY(header2+1); | |
2148 | while (!IS_LAST_ENTRY(entry1)) { | |
2149 | if (IS_LAST_ENTRY(entry2)) | |
2150 | return 1; | |
2151 | if (entry1->e_hash != entry2->e_hash || | |
2152 | entry1->e_name_index != entry2->e_name_index || | |
2153 | entry1->e_name_len != entry2->e_name_len || | |
2154 | entry1->e_value_size != entry2->e_value_size || | |
e50e5129 | 2155 | entry1->e_value_inum != entry2->e_value_inum || |
ac27a0ec DK |
2156 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) |
2157 | return 1; | |
ac27a0ec DK |
2158 | if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), |
2159 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), | |
2160 | le32_to_cpu(entry1->e_value_size))) | |
2161 | return 1; | |
2162 | ||
617ba13b MC |
2163 | entry1 = EXT4_XATTR_NEXT(entry1); |
2164 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
2165 | } |
2166 | if (!IS_LAST_ENTRY(entry2)) | |
2167 | return 1; | |
2168 | return 0; | |
2169 | } | |
2170 | ||
2171 | /* | |
617ba13b | 2172 | * ext4_xattr_cache_find() |
ac27a0ec DK |
2173 | * |
2174 | * Find an identical extended attribute block. | |
2175 | * | |
2176 | * Returns a pointer to the block found, or NULL if such a block was | |
2177 | * not found or an error occurred. | |
2178 | */ | |
2179 | static struct buffer_head * | |
617ba13b | 2180 | ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, |
7a2508e1 | 2181 | struct mb_cache_entry **pce) |
ac27a0ec DK |
2182 | { |
2183 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 JK |
2184 | struct mb_cache_entry *ce; |
2185 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); | |
ac27a0ec DK |
2186 | |
2187 | if (!header->h_hash) | |
2188 | return NULL; /* never share */ | |
2189 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
7a2508e1 | 2190 | ce = mb_cache_entry_find_first(ext4_mb_cache, hash); |
ac27a0ec DK |
2191 | while (ce) { |
2192 | struct buffer_head *bh; | |
2193 | ||
ac27a0ec DK |
2194 | bh = sb_bread(inode->i_sb, ce->e_block); |
2195 | if (!bh) { | |
24676da4 TT |
2196 | EXT4_ERROR_INODE(inode, "block %lu read error", |
2197 | (unsigned long) ce->e_block); | |
617ba13b | 2198 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
ac27a0ec DK |
2199 | *pce = ce; |
2200 | return bh; | |
2201 | } | |
2202 | brelse(bh); | |
7a2508e1 | 2203 | ce = mb_cache_entry_find_next(ext4_mb_cache, ce); |
ac27a0ec DK |
2204 | } |
2205 | return NULL; | |
2206 | } | |
2207 | ||
2208 | #define NAME_HASH_SHIFT 5 | |
2209 | #define VALUE_HASH_SHIFT 16 | |
2210 | ||
2211 | /* | |
617ba13b | 2212 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
2213 | * |
2214 | * Compute the hash of an extended attribute. | |
2215 | */ | |
617ba13b MC |
2216 | static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, |
2217 | struct ext4_xattr_entry *entry) | |
ac27a0ec DK |
2218 | { |
2219 | __u32 hash = 0; | |
2220 | char *name = entry->e_name; | |
2221 | int n; | |
2222 | ||
2b2d6d01 | 2223 | for (n = 0; n < entry->e_name_len; n++) { |
ac27a0ec DK |
2224 | hash = (hash << NAME_HASH_SHIFT) ^ |
2225 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
2226 | *name++; | |
2227 | } | |
2228 | ||
e50e5129 | 2229 | if (!entry->e_value_inum && entry->e_value_size) { |
ac27a0ec DK |
2230 | __le32 *value = (__le32 *)((char *)header + |
2231 | le16_to_cpu(entry->e_value_offs)); | |
2232 | for (n = (le32_to_cpu(entry->e_value_size) + | |
617ba13b | 2233 | EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { |
ac27a0ec DK |
2234 | hash = (hash << VALUE_HASH_SHIFT) ^ |
2235 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
2236 | le32_to_cpu(*value++); | |
2237 | } | |
2238 | } | |
2239 | entry->e_hash = cpu_to_le32(hash); | |
2240 | } | |
2241 | ||
2242 | #undef NAME_HASH_SHIFT | |
2243 | #undef VALUE_HASH_SHIFT | |
2244 | ||
2245 | #define BLOCK_HASH_SHIFT 16 | |
2246 | ||
2247 | /* | |
617ba13b | 2248 | * ext4_xattr_rehash() |
ac27a0ec DK |
2249 | * |
2250 | * Re-compute the extended attribute hash value after an entry has changed. | |
2251 | */ | |
617ba13b MC |
2252 | static void ext4_xattr_rehash(struct ext4_xattr_header *header, |
2253 | struct ext4_xattr_entry *entry) | |
ac27a0ec | 2254 | { |
617ba13b | 2255 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
2256 | __u32 hash = 0; |
2257 | ||
617ba13b | 2258 | ext4_xattr_hash_entry(header, entry); |
ac27a0ec DK |
2259 | here = ENTRY(header+1); |
2260 | while (!IS_LAST_ENTRY(here)) { | |
2261 | if (!here->e_hash) { | |
2262 | /* Block is not shared if an entry's hash value == 0 */ | |
2263 | hash = 0; | |
2264 | break; | |
2265 | } | |
2266 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
2267 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
2268 | le32_to_cpu(here->e_hash); | |
617ba13b | 2269 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
2270 | } |
2271 | header->h_hash = cpu_to_le32(hash); | |
2272 | } | |
2273 | ||
2274 | #undef BLOCK_HASH_SHIFT | |
2275 | ||
9c191f70 M |
2276 | #define HASH_BUCKET_BITS 10 |
2277 | ||
7a2508e1 | 2278 | struct mb_cache * |
82939d79 | 2279 | ext4_xattr_create_cache(void) |
ac27a0ec | 2280 | { |
7a2508e1 | 2281 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
2282 | } |
2283 | ||
7a2508e1 | 2284 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 2285 | { |
9c191f70 | 2286 | if (cache) |
7a2508e1 | 2287 | mb_cache_destroy(cache); |
ac27a0ec | 2288 | } |
9c191f70 | 2289 |