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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> | |
ac27a0ec DK |
56 | #include <linux/mbcache.h> |
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 |
ac27a0ec DK |
64 | # define ea_idebug(inode, f...) do { \ |
65 | printk(KERN_DEBUG "inode %s:%lu: ", \ | |
66 | inode->i_sb->s_id, inode->i_ino); \ | |
67 | printk(f); \ | |
68 | printk("\n"); \ | |
69 | } while (0) | |
70 | # define ea_bdebug(bh, f...) do { \ | |
71 | char b[BDEVNAME_SIZE]; \ | |
72 | printk(KERN_DEBUG "block %s:%lu: ", \ | |
73 | bdevname(bh->b_bdev, b), \ | |
74 | (unsigned long) bh->b_blocknr); \ | |
75 | printk(f); \ | |
76 | printk("\n"); \ | |
77 | } while (0) | |
78 | #else | |
ace36ad4 JP |
79 | # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
80 | # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) | |
ac27a0ec DK |
81 | #endif |
82 | ||
9c191f70 | 83 | static void ext4_xattr_cache_insert(struct mb_cache *, struct buffer_head *); |
617ba13b MC |
84 | static struct buffer_head *ext4_xattr_cache_find(struct inode *, |
85 | struct ext4_xattr_header *, | |
ac27a0ec | 86 | struct mb_cache_entry **); |
617ba13b MC |
87 | static void ext4_xattr_rehash(struct ext4_xattr_header *, |
88 | struct ext4_xattr_entry *); | |
431547b3 | 89 | static int ext4_xattr_list(struct dentry *dentry, char *buffer, |
d3a95d47 | 90 | size_t buffer_size); |
ac27a0ec | 91 | |
11e27528 | 92 | static const struct xattr_handler *ext4_xattr_handler_map[] = { |
617ba13b | 93 | [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, |
03010a33 | 94 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
95 | [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
96 | [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, | |
ac27a0ec | 97 | #endif |
617ba13b | 98 | [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, |
03010a33 | 99 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 100 | [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, |
ac27a0ec DK |
101 | #endif |
102 | }; | |
103 | ||
11e27528 | 104 | const struct xattr_handler *ext4_xattr_handlers[] = { |
617ba13b MC |
105 | &ext4_xattr_user_handler, |
106 | &ext4_xattr_trusted_handler, | |
03010a33 | 107 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
108 | &posix_acl_access_xattr_handler, |
109 | &posix_acl_default_xattr_handler, | |
ac27a0ec | 110 | #endif |
03010a33 | 111 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 112 | &ext4_xattr_security_handler, |
ac27a0ec DK |
113 | #endif |
114 | NULL | |
115 | }; | |
116 | ||
9c191f70 M |
117 | #define EXT4_GET_MB_CACHE(inode) (((struct ext4_sb_info *) \ |
118 | inode->i_sb->s_fs_info)->s_mb_cache) | |
119 | ||
cc8e94fd DW |
120 | static __le32 ext4_xattr_block_csum(struct inode *inode, |
121 | sector_t block_nr, | |
122 | struct ext4_xattr_header *hdr) | |
123 | { | |
124 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
d6a77105 TT |
125 | __u32 csum; |
126 | __le32 save_csum; | |
127 | __le64 dsk_block_nr = cpu_to_le64(block_nr); | |
cc8e94fd | 128 | |
d6a77105 | 129 | save_csum = hdr->h_checksum; |
cc8e94fd | 130 | hdr->h_checksum = 0; |
d6a77105 TT |
131 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, |
132 | sizeof(dsk_block_nr)); | |
cc8e94fd DW |
133 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr, |
134 | EXT4_BLOCK_SIZE(inode->i_sb)); | |
41eb70dd | 135 | |
d6a77105 | 136 | hdr->h_checksum = save_csum; |
cc8e94fd DW |
137 | return cpu_to_le32(csum); |
138 | } | |
139 | ||
140 | static int ext4_xattr_block_csum_verify(struct inode *inode, | |
141 | sector_t block_nr, | |
142 | struct ext4_xattr_header *hdr) | |
143 | { | |
9aa5d32b | 144 | if (ext4_has_metadata_csum(inode->i_sb) && |
cc8e94fd DW |
145 | (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr))) |
146 | return 0; | |
147 | return 1; | |
148 | } | |
149 | ||
150 | static void ext4_xattr_block_csum_set(struct inode *inode, | |
151 | sector_t block_nr, | |
152 | struct ext4_xattr_header *hdr) | |
153 | { | |
9aa5d32b | 154 | if (!ext4_has_metadata_csum(inode->i_sb)) |
cc8e94fd DW |
155 | return; |
156 | ||
157 | hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr); | |
158 | } | |
159 | ||
160 | static inline int ext4_handle_dirty_xattr_block(handle_t *handle, | |
161 | struct inode *inode, | |
162 | struct buffer_head *bh) | |
163 | { | |
164 | ext4_xattr_block_csum_set(inode, bh->b_blocknr, BHDR(bh)); | |
165 | return ext4_handle_dirty_metadata(handle, inode, bh); | |
166 | } | |
167 | ||
11e27528 | 168 | static inline const struct xattr_handler * |
617ba13b | 169 | ext4_xattr_handler(int name_index) |
ac27a0ec | 170 | { |
11e27528 | 171 | const struct xattr_handler *handler = NULL; |
ac27a0ec | 172 | |
617ba13b MC |
173 | if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
174 | handler = ext4_xattr_handler_map[name_index]; | |
ac27a0ec DK |
175 | return handler; |
176 | } | |
177 | ||
178 | /* | |
179 | * Inode operation listxattr() | |
180 | * | |
2b0143b5 | 181 | * d_inode(dentry)->i_mutex: don't care |
ac27a0ec DK |
182 | */ |
183 | ssize_t | |
617ba13b | 184 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) |
ac27a0ec | 185 | { |
431547b3 | 186 | return ext4_xattr_list(dentry, buffer, size); |
ac27a0ec DK |
187 | } |
188 | ||
189 | static int | |
a0626e75 DW |
190 | ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end, |
191 | void *value_start) | |
ac27a0ec | 192 | { |
a0626e75 DW |
193 | struct ext4_xattr_entry *e = entry; |
194 | ||
195 | while (!IS_LAST_ENTRY(e)) { | |
196 | struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); | |
ac27a0ec | 197 | if ((void *)next >= end) |
6a797d27 | 198 | return -EFSCORRUPTED; |
a0626e75 | 199 | e = next; |
ac27a0ec | 200 | } |
a0626e75 DW |
201 | |
202 | while (!IS_LAST_ENTRY(entry)) { | |
203 | if (entry->e_value_size != 0 && | |
204 | (value_start + le16_to_cpu(entry->e_value_offs) < | |
205 | (void *)e + sizeof(__u32) || | |
206 | value_start + le16_to_cpu(entry->e_value_offs) + | |
207 | le32_to_cpu(entry->e_value_size) > end)) | |
6a797d27 | 208 | return -EFSCORRUPTED; |
a0626e75 DW |
209 | entry = EXT4_XATTR_NEXT(entry); |
210 | } | |
211 | ||
ac27a0ec DK |
212 | return 0; |
213 | } | |
214 | ||
215 | static inline int | |
cc8e94fd | 216 | ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) |
ac27a0ec | 217 | { |
cc8e94fd DW |
218 | int error; |
219 | ||
220 | if (buffer_verified(bh)) | |
221 | return 0; | |
222 | ||
617ba13b | 223 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 224 | BHDR(bh)->h_blocks != cpu_to_le32(1)) |
6a797d27 | 225 | return -EFSCORRUPTED; |
cc8e94fd | 226 | if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh))) |
6a797d27 | 227 | return -EFSBADCRC; |
a0626e75 DW |
228 | error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size, |
229 | bh->b_data); | |
cc8e94fd DW |
230 | if (!error) |
231 | set_buffer_verified(bh); | |
232 | return error; | |
ac27a0ec DK |
233 | } |
234 | ||
235 | static inline int | |
617ba13b | 236 | ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) |
ac27a0ec DK |
237 | { |
238 | size_t value_size = le32_to_cpu(entry->e_value_size); | |
239 | ||
240 | if (entry->e_value_block != 0 || value_size > size || | |
241 | le16_to_cpu(entry->e_value_offs) + value_size > size) | |
6a797d27 | 242 | return -EFSCORRUPTED; |
ac27a0ec DK |
243 | return 0; |
244 | } | |
245 | ||
246 | static int | |
617ba13b | 247 | ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, |
ac27a0ec DK |
248 | const char *name, size_t size, int sorted) |
249 | { | |
617ba13b | 250 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
251 | size_t name_len; |
252 | int cmp = 1; | |
253 | ||
254 | if (name == NULL) | |
255 | return -EINVAL; | |
256 | name_len = strlen(name); | |
257 | entry = *pentry; | |
617ba13b | 258 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
ac27a0ec DK |
259 | cmp = name_index - entry->e_name_index; |
260 | if (!cmp) | |
261 | cmp = name_len - entry->e_name_len; | |
262 | if (!cmp) | |
263 | cmp = memcmp(name, entry->e_name, name_len); | |
264 | if (cmp <= 0 && (sorted || cmp == 0)) | |
265 | break; | |
266 | } | |
267 | *pentry = entry; | |
617ba13b | 268 | if (!cmp && ext4_xattr_check_entry(entry, size)) |
6a797d27 | 269 | return -EFSCORRUPTED; |
ac27a0ec DK |
270 | return cmp ? -ENODATA : 0; |
271 | } | |
272 | ||
273 | static int | |
617ba13b | 274 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
275 | void *buffer, size_t buffer_size) |
276 | { | |
277 | struct buffer_head *bh = NULL; | |
617ba13b | 278 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
279 | size_t size; |
280 | int error; | |
9c191f70 | 281 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
282 | |
283 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
284 | name_index, name, buffer, (long)buffer_size); | |
285 | ||
286 | error = -ENODATA; | |
617ba13b | 287 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 288 | goto cleanup; |
ace36ad4 JP |
289 | ea_idebug(inode, "reading block %llu", |
290 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 291 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
292 | if (!bh) |
293 | goto cleanup; | |
294 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
295 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 296 | if (ext4_xattr_check_block(inode, bh)) { |
12062ddd | 297 | bad_block: |
24676da4 TT |
298 | EXT4_ERROR_INODE(inode, "bad block %llu", |
299 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 300 | error = -EFSCORRUPTED; |
ac27a0ec DK |
301 | goto cleanup; |
302 | } | |
9c191f70 | 303 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
ac27a0ec | 304 | entry = BFIRST(bh); |
617ba13b | 305 | error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); |
6a797d27 | 306 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
307 | goto bad_block; |
308 | if (error) | |
309 | goto cleanup; | |
310 | size = le32_to_cpu(entry->e_value_size); | |
311 | if (buffer) { | |
312 | error = -ERANGE; | |
313 | if (size > buffer_size) | |
314 | goto cleanup; | |
315 | memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), | |
316 | size); | |
317 | } | |
318 | error = size; | |
319 | ||
320 | cleanup: | |
321 | brelse(bh); | |
322 | return error; | |
323 | } | |
324 | ||
879b3825 | 325 | int |
617ba13b | 326 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
327 | void *buffer, size_t buffer_size) |
328 | { | |
617ba13b MC |
329 | struct ext4_xattr_ibody_header *header; |
330 | struct ext4_xattr_entry *entry; | |
331 | struct ext4_inode *raw_inode; | |
332 | struct ext4_iloc iloc; | |
ac27a0ec DK |
333 | size_t size; |
334 | void *end; | |
335 | int error; | |
336 | ||
19f5fb7a | 337 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 338 | return -ENODATA; |
617ba13b | 339 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
340 | if (error) |
341 | return error; | |
617ba13b | 342 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec DK |
343 | header = IHDR(inode, raw_inode); |
344 | entry = IFIRST(header); | |
617ba13b | 345 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
a0626e75 | 346 | error = ext4_xattr_check_names(entry, end, entry); |
ac27a0ec DK |
347 | if (error) |
348 | goto cleanup; | |
617ba13b | 349 | error = ext4_xattr_find_entry(&entry, name_index, name, |
ac27a0ec DK |
350 | end - (void *)entry, 0); |
351 | if (error) | |
352 | goto cleanup; | |
353 | size = le32_to_cpu(entry->e_value_size); | |
354 | if (buffer) { | |
355 | error = -ERANGE; | |
356 | if (size > buffer_size) | |
357 | goto cleanup; | |
358 | memcpy(buffer, (void *)IFIRST(header) + | |
359 | le16_to_cpu(entry->e_value_offs), size); | |
360 | } | |
361 | error = size; | |
362 | ||
363 | cleanup: | |
364 | brelse(iloc.bh); | |
365 | return error; | |
366 | } | |
367 | ||
368 | /* | |
617ba13b | 369 | * ext4_xattr_get() |
ac27a0ec DK |
370 | * |
371 | * Copy an extended attribute into the buffer | |
372 | * provided, or compute the buffer size required. | |
373 | * Buffer is NULL to compute the size of the buffer required. | |
374 | * | |
375 | * Returns a negative error number on failure, or the number of bytes | |
376 | * used / required on success. | |
377 | */ | |
378 | int | |
617ba13b | 379 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
380 | void *buffer, size_t buffer_size) |
381 | { | |
382 | int error; | |
383 | ||
230b8c1a ZZ |
384 | if (strlen(name) > 255) |
385 | return -ERANGE; | |
386 | ||
617ba13b MC |
387 | down_read(&EXT4_I(inode)->xattr_sem); |
388 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
389 | buffer_size); |
390 | if (error == -ENODATA) | |
617ba13b | 391 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 392 | buffer_size); |
617ba13b | 393 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
394 | return error; |
395 | } | |
396 | ||
397 | static int | |
431547b3 | 398 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
399 | char *buffer, size_t buffer_size) |
400 | { | |
401 | size_t rest = buffer_size; | |
402 | ||
617ba13b | 403 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 404 | const struct xattr_handler *handler = |
617ba13b | 405 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec DK |
406 | |
407 | if (handler) { | |
d9a82a04 AG |
408 | size_t size = handler->list(handler, dentry, buffer, |
409 | rest, entry->e_name, | |
410 | entry->e_name_len); | |
ac27a0ec DK |
411 | if (buffer) { |
412 | if (size > rest) | |
413 | return -ERANGE; | |
414 | buffer += size; | |
415 | } | |
416 | rest -= size; | |
417 | } | |
418 | } | |
419 | return buffer_size - rest; | |
420 | } | |
421 | ||
422 | static int | |
431547b3 | 423 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 424 | { |
2b0143b5 | 425 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
426 | struct buffer_head *bh = NULL; |
427 | int error; | |
9c191f70 | 428 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
429 | |
430 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
431 | buffer, (long)buffer_size); | |
432 | ||
433 | error = 0; | |
617ba13b | 434 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 435 | goto cleanup; |
ace36ad4 JP |
436 | ea_idebug(inode, "reading block %llu", |
437 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 438 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
439 | error = -EIO; |
440 | if (!bh) | |
441 | goto cleanup; | |
442 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
443 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 444 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
445 | EXT4_ERROR_INODE(inode, "bad block %llu", |
446 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 447 | error = -EFSCORRUPTED; |
ac27a0ec DK |
448 | goto cleanup; |
449 | } | |
9c191f70 | 450 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
431547b3 | 451 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); |
ac27a0ec DK |
452 | |
453 | cleanup: | |
454 | brelse(bh); | |
455 | ||
456 | return error; | |
457 | } | |
458 | ||
459 | static int | |
431547b3 | 460 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 461 | { |
2b0143b5 | 462 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
463 | struct ext4_xattr_ibody_header *header; |
464 | struct ext4_inode *raw_inode; | |
465 | struct ext4_iloc iloc; | |
ac27a0ec DK |
466 | void *end; |
467 | int error; | |
468 | ||
19f5fb7a | 469 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 470 | return 0; |
617ba13b | 471 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
472 | if (error) |
473 | return error; | |
617ba13b | 474 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 475 | header = IHDR(inode, raw_inode); |
617ba13b | 476 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
a0626e75 | 477 | error = ext4_xattr_check_names(IFIRST(header), end, IFIRST(header)); |
ac27a0ec DK |
478 | if (error) |
479 | goto cleanup; | |
431547b3 | 480 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
481 | buffer, buffer_size); |
482 | ||
483 | cleanup: | |
484 | brelse(iloc.bh); | |
485 | return error; | |
486 | } | |
487 | ||
488 | /* | |
617ba13b | 489 | * ext4_xattr_list() |
ac27a0ec DK |
490 | * |
491 | * Copy a list of attribute names into the buffer | |
492 | * provided, or compute the buffer size required. | |
493 | * Buffer is NULL to compute the size of the buffer required. | |
494 | * | |
495 | * Returns a negative error number on failure, or the number of bytes | |
496 | * used / required on success. | |
497 | */ | |
d3a95d47 | 498 | static int |
431547b3 | 499 | ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 500 | { |
eaeef867 | 501 | int ret, ret2; |
ac27a0ec | 502 | |
2b0143b5 | 503 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
504 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
505 | if (ret < 0) | |
506 | goto errout; | |
507 | if (buffer) { | |
508 | buffer += ret; | |
509 | buffer_size -= ret; | |
ac27a0ec | 510 | } |
eaeef867 TT |
511 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
512 | if (ret < 0) | |
513 | goto errout; | |
514 | ret += ret2; | |
515 | errout: | |
2b0143b5 | 516 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 517 | return ret; |
ac27a0ec DK |
518 | } |
519 | ||
520 | /* | |
617ba13b | 521 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
522 | * not set, set it. |
523 | */ | |
617ba13b | 524 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
525 | struct super_block *sb) |
526 | { | |
e2b911c5 | 527 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
528 | return; |
529 | ||
5d601255 | 530 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 531 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
e2b911c5 | 532 | ext4_set_feature_xattr(sb); |
a0375156 | 533 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec | 534 | } |
ac27a0ec DK |
535 | } |
536 | ||
537 | /* | |
ec4cb1aa JK |
538 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
539 | * otherwise free the block. | |
ac27a0ec DK |
540 | */ |
541 | static void | |
617ba13b | 542 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
ac27a0ec DK |
543 | struct buffer_head *bh) |
544 | { | |
545 | struct mb_cache_entry *ce = NULL; | |
8a2bfdcb | 546 | int error = 0; |
9c191f70 | 547 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec | 548 | |
9c191f70 | 549 | ce = mb_cache_entry_get(ext4_mb_cache, bh->b_bdev, bh->b_blocknr); |
5d601255 | 550 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
551 | error = ext4_journal_get_write_access(handle, bh); |
552 | if (error) | |
553 | goto out; | |
554 | ||
555 | lock_buffer(bh); | |
ac27a0ec DK |
556 | if (BHDR(bh)->h_refcount == cpu_to_le32(1)) { |
557 | ea_bdebug(bh, "refcount now=0; freeing"); | |
558 | if (ce) | |
559 | mb_cache_entry_free(ce); | |
ac27a0ec | 560 | get_bh(bh); |
ec4cb1aa | 561 | unlock_buffer(bh); |
e6362609 TT |
562 | ext4_free_blocks(handle, inode, bh, 0, 1, |
563 | EXT4_FREE_BLOCKS_METADATA | | |
564 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 565 | } else { |
e8546d06 | 566 | le32_add_cpu(&BHDR(bh)->h_refcount, -1); |
c1bb05a6 ES |
567 | if (ce) |
568 | mb_cache_entry_release(ce); | |
ec4cb1aa JK |
569 | /* |
570 | * Beware of this ugliness: Releasing of xattr block references | |
571 | * from different inodes can race and so we have to protect | |
572 | * from a race where someone else frees the block (and releases | |
573 | * its journal_head) before we are done dirtying the buffer. In | |
574 | * nojournal mode this race is harmless and we actually cannot | |
575 | * call ext4_handle_dirty_xattr_block() with locked buffer as | |
576 | * that function can call sync_dirty_buffer() so for that case | |
577 | * we handle the dirtying after unlocking the buffer. | |
578 | */ | |
579 | if (ext4_handle_valid(handle)) | |
580 | error = ext4_handle_dirty_xattr_block(handle, inode, | |
581 | bh); | |
c1bb05a6 | 582 | unlock_buffer(bh); |
ec4cb1aa JK |
583 | if (!ext4_handle_valid(handle)) |
584 | error = ext4_handle_dirty_xattr_block(handle, inode, | |
585 | bh); | |
8a2bfdcb | 586 | if (IS_SYNC(inode)) |
0390131b | 587 | ext4_handle_sync(handle); |
1231b3a1 | 588 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
589 | ea_bdebug(bh, "refcount now=%d; releasing", |
590 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 591 | } |
8a2bfdcb MC |
592 | out: |
593 | ext4_std_error(inode->i_sb, error); | |
594 | return; | |
ac27a0ec DK |
595 | } |
596 | ||
6dd4ee7c KS |
597 | /* |
598 | * Find the available free space for EAs. This also returns the total number of | |
599 | * bytes used by EA entries. | |
600 | */ | |
601 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
602 | size_t *min_offs, void *base, int *total) | |
603 | { | |
604 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
6dd4ee7c KS |
605 | if (!last->e_value_block && last->e_value_size) { |
606 | size_t offs = le16_to_cpu(last->e_value_offs); | |
607 | if (offs < *min_offs) | |
608 | *min_offs = offs; | |
609 | } | |
7b1b2c1b TT |
610 | if (total) |
611 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
612 | } |
613 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
614 | } | |
615 | ||
ac27a0ec | 616 | static int |
617ba13b | 617 | ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) |
ac27a0ec | 618 | { |
617ba13b | 619 | struct ext4_xattr_entry *last; |
ac27a0ec DK |
620 | size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); |
621 | ||
622 | /* Compute min_offs and last. */ | |
623 | last = s->first; | |
617ba13b | 624 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
ac27a0ec DK |
625 | if (!last->e_value_block && last->e_value_size) { |
626 | size_t offs = le16_to_cpu(last->e_value_offs); | |
627 | if (offs < min_offs) | |
628 | min_offs = offs; | |
629 | } | |
630 | } | |
631 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); | |
632 | if (!s->not_found) { | |
633 | if (!s->here->e_value_block && s->here->e_value_size) { | |
634 | size_t size = le32_to_cpu(s->here->e_value_size); | |
617ba13b | 635 | free += EXT4_XATTR_SIZE(size); |
ac27a0ec | 636 | } |
617ba13b | 637 | free += EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
638 | } |
639 | if (i->value) { | |
5f80f62a | 640 | if (free < EXT4_XATTR_LEN(name_len) + |
617ba13b | 641 | EXT4_XATTR_SIZE(i->value_len)) |
ac27a0ec DK |
642 | return -ENOSPC; |
643 | } | |
644 | ||
645 | if (i->value && s->not_found) { | |
646 | /* Insert the new name. */ | |
617ba13b | 647 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
648 | size_t rest = (void *)last - (void *)s->here + sizeof(__u32); |
649 | memmove((void *)s->here + size, s->here, rest); | |
650 | memset(s->here, 0, size); | |
651 | s->here->e_name_index = i->name_index; | |
652 | s->here->e_name_len = name_len; | |
653 | memcpy(s->here->e_name, i->name, name_len); | |
654 | } else { | |
655 | if (!s->here->e_value_block && s->here->e_value_size) { | |
656 | void *first_val = s->base + min_offs; | |
657 | size_t offs = le16_to_cpu(s->here->e_value_offs); | |
658 | void *val = s->base + offs; | |
617ba13b | 659 | size_t size = EXT4_XATTR_SIZE( |
ac27a0ec DK |
660 | le32_to_cpu(s->here->e_value_size)); |
661 | ||
617ba13b | 662 | if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { |
ac27a0ec DK |
663 | /* The old and the new value have the same |
664 | size. Just replace. */ | |
665 | s->here->e_value_size = | |
666 | cpu_to_le32(i->value_len); | |
bd9926e8 TT |
667 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
668 | memset(val, 0, size); | |
669 | } else { | |
670 | /* Clear pad bytes first. */ | |
671 | memset(val + size - EXT4_XATTR_PAD, 0, | |
672 | EXT4_XATTR_PAD); | |
673 | memcpy(val, i->value, i->value_len); | |
674 | } | |
ac27a0ec DK |
675 | return 0; |
676 | } | |
677 | ||
678 | /* Remove the old value. */ | |
679 | memmove(first_val + size, first_val, val - first_val); | |
680 | memset(first_val, 0, size); | |
681 | s->here->e_value_size = 0; | |
682 | s->here->e_value_offs = 0; | |
683 | min_offs += size; | |
684 | ||
685 | /* Adjust all value offsets. */ | |
686 | last = s->first; | |
687 | while (!IS_LAST_ENTRY(last)) { | |
688 | size_t o = le16_to_cpu(last->e_value_offs); | |
689 | if (!last->e_value_block && | |
690 | last->e_value_size && o < offs) | |
691 | last->e_value_offs = | |
692 | cpu_to_le16(o + size); | |
617ba13b | 693 | last = EXT4_XATTR_NEXT(last); |
ac27a0ec DK |
694 | } |
695 | } | |
696 | if (!i->value) { | |
697 | /* Remove the old name. */ | |
617ba13b | 698 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
699 | last = ENTRY((void *)last - size); |
700 | memmove(s->here, (void *)s->here + size, | |
701 | (void *)last - (void *)s->here + sizeof(__u32)); | |
702 | memset(last, 0, size); | |
703 | } | |
704 | } | |
705 | ||
706 | if (i->value) { | |
707 | /* Insert the new value. */ | |
708 | s->here->e_value_size = cpu_to_le32(i->value_len); | |
709 | if (i->value_len) { | |
617ba13b | 710 | size_t size = EXT4_XATTR_SIZE(i->value_len); |
ac27a0ec DK |
711 | void *val = s->base + min_offs - size; |
712 | s->here->e_value_offs = cpu_to_le16(min_offs - size); | |
bd9926e8 TT |
713 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
714 | memset(val, 0, size); | |
715 | } else { | |
716 | /* Clear the pad bytes first. */ | |
717 | memset(val + size - EXT4_XATTR_PAD, 0, | |
718 | EXT4_XATTR_PAD); | |
719 | memcpy(val, i->value, i->value_len); | |
720 | } | |
ac27a0ec DK |
721 | } |
722 | } | |
723 | return 0; | |
724 | } | |
725 | ||
617ba13b MC |
726 | struct ext4_xattr_block_find { |
727 | struct ext4_xattr_search s; | |
ac27a0ec DK |
728 | struct buffer_head *bh; |
729 | }; | |
730 | ||
731 | static int | |
617ba13b MC |
732 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
733 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
734 | { |
735 | struct super_block *sb = inode->i_sb; | |
736 | int error; | |
737 | ||
738 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
739 | i->name_index, i->name, i->value, (long)i->value_len); | |
740 | ||
617ba13b | 741 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 742 | /* The inode already has an extended attribute block. */ |
617ba13b | 743 | bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
744 | error = -EIO; |
745 | if (!bs->bh) | |
746 | goto cleanup; | |
747 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", | |
748 | atomic_read(&(bs->bh->b_count)), | |
749 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
cc8e94fd | 750 | if (ext4_xattr_check_block(inode, bs->bh)) { |
24676da4 TT |
751 | EXT4_ERROR_INODE(inode, "bad block %llu", |
752 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 753 | error = -EFSCORRUPTED; |
ac27a0ec DK |
754 | goto cleanup; |
755 | } | |
756 | /* Find the named attribute. */ | |
757 | bs->s.base = BHDR(bs->bh); | |
758 | bs->s.first = BFIRST(bs->bh); | |
759 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
760 | bs->s.here = bs->s.first; | |
617ba13b | 761 | error = ext4_xattr_find_entry(&bs->s.here, i->name_index, |
ac27a0ec DK |
762 | i->name, bs->bh->b_size, 1); |
763 | if (error && error != -ENODATA) | |
764 | goto cleanup; | |
765 | bs->s.not_found = error; | |
766 | } | |
767 | error = 0; | |
768 | ||
769 | cleanup: | |
770 | return error; | |
771 | } | |
772 | ||
773 | static int | |
617ba13b MC |
774 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
775 | struct ext4_xattr_info *i, | |
776 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
777 | { |
778 | struct super_block *sb = inode->i_sb; | |
779 | struct buffer_head *new_bh = NULL; | |
617ba13b | 780 | struct ext4_xattr_search *s = &bs->s; |
ac27a0ec | 781 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 782 | int error = 0; |
9c191f70 | 783 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec | 784 | |
617ba13b | 785 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec DK |
786 | |
787 | if (i->value && i->value_len > sb->s_blocksize) | |
788 | return -ENOSPC; | |
789 | if (s->base) { | |
9c191f70 | 790 | ce = mb_cache_entry_get(ext4_mb_cache, bs->bh->b_bdev, |
ac27a0ec | 791 | bs->bh->b_blocknr); |
5d601255 | 792 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
793 | error = ext4_journal_get_write_access(handle, bs->bh); |
794 | if (error) | |
795 | goto cleanup; | |
796 | lock_buffer(bs->bh); | |
797 | ||
ac27a0ec DK |
798 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
799 | if (ce) { | |
800 | mb_cache_entry_free(ce); | |
801 | ce = NULL; | |
802 | } | |
803 | ea_bdebug(bs->bh, "modifying in-place"); | |
617ba13b | 804 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
805 | if (!error) { |
806 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 807 | ext4_xattr_rehash(header(s->base), |
ac27a0ec | 808 | s->here); |
9c191f70 M |
809 | ext4_xattr_cache_insert(ext4_mb_cache, |
810 | bs->bh); | |
ac27a0ec DK |
811 | } |
812 | unlock_buffer(bs->bh); | |
6a797d27 | 813 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
814 | goto bad_block; |
815 | if (!error) | |
cc8e94fd DW |
816 | error = ext4_handle_dirty_xattr_block(handle, |
817 | inode, | |
818 | bs->bh); | |
ac27a0ec DK |
819 | if (error) |
820 | goto cleanup; | |
821 | goto inserted; | |
822 | } else { | |
823 | int offset = (char *)s->here - bs->bh->b_data; | |
824 | ||
8a2bfdcb | 825 | unlock_buffer(bs->bh); |
ac27a0ec DK |
826 | if (ce) { |
827 | mb_cache_entry_release(ce); | |
828 | ce = NULL; | |
829 | } | |
830 | ea_bdebug(bs->bh, "cloning"); | |
216553c4 | 831 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
832 | error = -ENOMEM; |
833 | if (s->base == NULL) | |
834 | goto cleanup; | |
835 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
836 | s->first = ENTRY(header(s->base)+1); | |
837 | header(s->base)->h_refcount = cpu_to_le32(1); | |
838 | s->here = ENTRY(s->base + offset); | |
839 | s->end = s->base + bs->bh->b_size; | |
840 | } | |
841 | } else { | |
842 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 843 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
844 | /* assert(header == s->base) */ |
845 | error = -ENOMEM; | |
846 | if (s->base == NULL) | |
847 | goto cleanup; | |
617ba13b | 848 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
849 | header(s->base)->h_blocks = cpu_to_le32(1); |
850 | header(s->base)->h_refcount = cpu_to_le32(1); | |
851 | s->first = ENTRY(header(s->base)+1); | |
852 | s->here = ENTRY(header(s->base)+1); | |
853 | s->end = s->base + sb->s_blocksize; | |
854 | } | |
855 | ||
617ba13b | 856 | error = ext4_xattr_set_entry(i, s); |
6a797d27 | 857 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
858 | goto bad_block; |
859 | if (error) | |
860 | goto cleanup; | |
861 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 862 | ext4_xattr_rehash(header(s->base), s->here); |
ac27a0ec DK |
863 | |
864 | inserted: | |
865 | if (!IS_LAST_ENTRY(s->first)) { | |
617ba13b | 866 | new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); |
ac27a0ec DK |
867 | if (new_bh) { |
868 | /* We found an identical block in the cache. */ | |
869 | if (new_bh == bs->bh) | |
870 | ea_bdebug(new_bh, "keeping"); | |
871 | else { | |
872 | /* The old block is released after updating | |
873 | the inode. */ | |
1231b3a1 LC |
874 | error = dquot_alloc_block(inode, |
875 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 876 | if (error) |
ac27a0ec | 877 | goto cleanup; |
5d601255 | 878 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 879 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
880 | new_bh); |
881 | if (error) | |
882 | goto cleanup_dquot; | |
883 | lock_buffer(new_bh); | |
e8546d06 | 884 | le32_add_cpu(&BHDR(new_bh)->h_refcount, 1); |
ac27a0ec DK |
885 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
886 | le32_to_cpu(BHDR(new_bh)->h_refcount)); | |
887 | unlock_buffer(new_bh); | |
cc8e94fd DW |
888 | error = ext4_handle_dirty_xattr_block(handle, |
889 | inode, | |
890 | new_bh); | |
ac27a0ec DK |
891 | if (error) |
892 | goto cleanup_dquot; | |
893 | } | |
894 | mb_cache_entry_release(ce); | |
895 | ce = NULL; | |
896 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
897 | /* We were modifying this block in-place. */ | |
898 | ea_bdebug(bs->bh, "keeping this block"); | |
899 | new_bh = bs->bh; | |
900 | get_bh(new_bh); | |
901 | } else { | |
902 | /* We need to allocate a new block */ | |
fb0a387d ES |
903 | ext4_fsblk_t goal, block; |
904 | ||
905 | goal = ext4_group_first_block_no(sb, | |
d00a6d7b | 906 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
907 | |
908 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 909 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
910 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
911 | ||
55f020db AH |
912 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
913 | NULL, &error); | |
ac27a0ec DK |
914 | if (error) |
915 | goto cleanup; | |
fb0a387d | 916 | |
12e9b892 | 917 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
918 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
919 | ||
ace36ad4 JP |
920 | ea_idebug(inode, "creating block %llu", |
921 | (unsigned long long)block); | |
ac27a0ec DK |
922 | |
923 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 924 | if (unlikely(!new_bh)) { |
860d21e2 | 925 | error = -ENOMEM; |
ac27a0ec | 926 | getblk_failed: |
7dc57615 | 927 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 928 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
929 | goto cleanup; |
930 | } | |
931 | lock_buffer(new_bh); | |
617ba13b | 932 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
933 | if (error) { |
934 | unlock_buffer(new_bh); | |
860d21e2 | 935 | error = -EIO; |
ac27a0ec DK |
936 | goto getblk_failed; |
937 | } | |
938 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
939 | set_buffer_uptodate(new_bh); | |
940 | unlock_buffer(new_bh); | |
9c191f70 | 941 | ext4_xattr_cache_insert(ext4_mb_cache, new_bh); |
cc8e94fd DW |
942 | error = ext4_handle_dirty_xattr_block(handle, |
943 | inode, new_bh); | |
ac27a0ec DK |
944 | if (error) |
945 | goto cleanup; | |
946 | } | |
947 | } | |
948 | ||
949 | /* Update the inode. */ | |
617ba13b | 950 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
951 | |
952 | /* Drop the previous xattr block. */ | |
953 | if (bs->bh && bs->bh != new_bh) | |
617ba13b | 954 | ext4_xattr_release_block(handle, inode, bs->bh); |
ac27a0ec DK |
955 | error = 0; |
956 | ||
957 | cleanup: | |
958 | if (ce) | |
959 | mb_cache_entry_release(ce); | |
960 | brelse(new_bh); | |
961 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
962 | kfree(s->base); | |
963 | ||
964 | return error; | |
965 | ||
966 | cleanup_dquot: | |
1231b3a1 | 967 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
968 | goto cleanup; |
969 | ||
970 | bad_block: | |
24676da4 TT |
971 | EXT4_ERROR_INODE(inode, "bad block %llu", |
972 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
973 | goto cleanup; |
974 | ||
975 | #undef header | |
976 | } | |
977 | ||
879b3825 TM |
978 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
979 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 980 | { |
617ba13b MC |
981 | struct ext4_xattr_ibody_header *header; |
982 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
983 | int error; |
984 | ||
617ba13b | 985 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 986 | return 0; |
617ba13b | 987 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
988 | header = IHDR(inode, raw_inode); |
989 | is->s.base = is->s.first = IFIRST(header); | |
990 | is->s.here = is->s.first; | |
617ba13b | 991 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 992 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
a0626e75 DW |
993 | error = ext4_xattr_check_names(IFIRST(header), is->s.end, |
994 | IFIRST(header)); | |
ac27a0ec DK |
995 | if (error) |
996 | return error; | |
997 | /* Find the named attribute. */ | |
617ba13b | 998 | error = ext4_xattr_find_entry(&is->s.here, i->name_index, |
ac27a0ec DK |
999 | i->name, is->s.end - |
1000 | (void *)is->s.base, 0); | |
1001 | if (error && error != -ENODATA) | |
1002 | return error; | |
1003 | is->s.not_found = error; | |
1004 | } | |
1005 | return 0; | |
1006 | } | |
1007 | ||
0d812f77 TM |
1008 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
1009 | struct ext4_xattr_info *i, | |
1010 | struct ext4_xattr_ibody_find *is) | |
1011 | { | |
1012 | struct ext4_xattr_ibody_header *header; | |
1013 | struct ext4_xattr_search *s = &is->s; | |
1014 | int error; | |
1015 | ||
1016 | if (EXT4_I(inode)->i_extra_isize == 0) | |
1017 | return -ENOSPC; | |
1018 | error = ext4_xattr_set_entry(i, s); | |
1019 | if (error) { | |
1020 | if (error == -ENOSPC && | |
1021 | ext4_has_inline_data(inode)) { | |
1022 | error = ext4_try_to_evict_inline_data(handle, inode, | |
1023 | EXT4_XATTR_LEN(strlen(i->name) + | |
1024 | EXT4_XATTR_SIZE(i->value_len))); | |
1025 | if (error) | |
1026 | return error; | |
1027 | error = ext4_xattr_ibody_find(inode, i, is); | |
1028 | if (error) | |
1029 | return error; | |
1030 | error = ext4_xattr_set_entry(i, s); | |
1031 | } | |
1032 | if (error) | |
1033 | return error; | |
1034 | } | |
1035 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); | |
1036 | if (!IS_LAST_ENTRY(s->first)) { | |
1037 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
1038 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
1039 | } else { | |
1040 | header->h_magic = cpu_to_le32(0); | |
1041 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
1042 | } | |
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, | |
1047 | struct ext4_xattr_info *i, | |
1048 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 1049 | { |
617ba13b MC |
1050 | struct ext4_xattr_ibody_header *header; |
1051 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
1052 | int error; |
1053 | ||
617ba13b | 1054 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1055 | return -ENOSPC; |
617ba13b | 1056 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
1057 | if (error) |
1058 | return error; | |
617ba13b | 1059 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 1060 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 1061 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 1062 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1063 | } else { |
1064 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 1065 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1066 | } |
1067 | return 0; | |
1068 | } | |
1069 | ||
1070 | /* | |
617ba13b | 1071 | * ext4_xattr_set_handle() |
ac27a0ec | 1072 | * |
6e9510b0 | 1073 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
1074 | * is NULL to remove an existing extended attribute, and non-NULL to |
1075 | * either replace an existing extended attribute, or create a new extended | |
1076 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
1077 | * specify that an extended attribute must exist and must not exist | |
1078 | * previous to the call, respectively. | |
1079 | * | |
1080 | * Returns 0, or a negative error number on failure. | |
1081 | */ | |
1082 | int | |
617ba13b | 1083 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
1084 | const char *name, const void *value, size_t value_len, |
1085 | int flags) | |
1086 | { | |
617ba13b | 1087 | struct ext4_xattr_info i = { |
ac27a0ec DK |
1088 | .name_index = name_index, |
1089 | .name = name, | |
1090 | .value = value, | |
1091 | .value_len = value_len, | |
1092 | ||
1093 | }; | |
617ba13b | 1094 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
1095 | .s = { .not_found = -ENODATA, }, |
1096 | }; | |
617ba13b | 1097 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
1098 | .s = { .not_found = -ENODATA, }, |
1099 | }; | |
4d20c685 | 1100 | unsigned long no_expand; |
ac27a0ec DK |
1101 | int error; |
1102 | ||
1103 | if (!name) | |
1104 | return -EINVAL; | |
1105 | if (strlen(name) > 255) | |
1106 | return -ERANGE; | |
617ba13b | 1107 | down_write(&EXT4_I(inode)->xattr_sem); |
19f5fb7a TT |
1108 | no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); |
1109 | ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); | |
4d20c685 | 1110 | |
66543617 | 1111 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
1112 | if (error) |
1113 | goto cleanup; | |
1114 | ||
19f5fb7a | 1115 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
1116 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
1117 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 1118 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
1119 | } |
1120 | ||
617ba13b | 1121 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
1122 | if (error) |
1123 | goto cleanup; | |
1124 | if (is.s.not_found) | |
617ba13b | 1125 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
1126 | if (error) |
1127 | goto cleanup; | |
1128 | if (is.s.not_found && bs.s.not_found) { | |
1129 | error = -ENODATA; | |
1130 | if (flags & XATTR_REPLACE) | |
1131 | goto cleanup; | |
1132 | error = 0; | |
1133 | if (!value) | |
1134 | goto cleanup; | |
1135 | } else { | |
1136 | error = -EEXIST; | |
1137 | if (flags & XATTR_CREATE) | |
1138 | goto cleanup; | |
1139 | } | |
ac27a0ec DK |
1140 | if (!value) { |
1141 | if (!is.s.not_found) | |
617ba13b | 1142 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 1143 | else if (!bs.s.not_found) |
617ba13b | 1144 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1145 | } else { |
617ba13b | 1146 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
1147 | if (!error && !bs.s.not_found) { |
1148 | i.value = NULL; | |
617ba13b | 1149 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1150 | } else if (error == -ENOSPC) { |
7e01c8e5 TY |
1151 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
1152 | error = ext4_xattr_block_find(inode, &i, &bs); | |
1153 | if (error) | |
1154 | goto cleanup; | |
1155 | } | |
617ba13b | 1156 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec DK |
1157 | if (error) |
1158 | goto cleanup; | |
1159 | if (!is.s.not_found) { | |
1160 | i.value = NULL; | |
617ba13b | 1161 | error = ext4_xattr_ibody_set(handle, inode, &i, |
ac27a0ec DK |
1162 | &is); |
1163 | } | |
1164 | } | |
1165 | } | |
1166 | if (!error) { | |
617ba13b | 1167 | ext4_xattr_update_super_block(handle, inode->i_sb); |
ef7f3835 | 1168 | inode->i_ctime = ext4_current_time(inode); |
6dd4ee7c | 1169 | if (!value) |
19f5fb7a | 1170 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
617ba13b | 1171 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 1172 | /* |
617ba13b | 1173 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
1174 | * error != 0. |
1175 | */ | |
1176 | is.iloc.bh = NULL; | |
1177 | if (IS_SYNC(inode)) | |
0390131b | 1178 | ext4_handle_sync(handle); |
ac27a0ec DK |
1179 | } |
1180 | ||
1181 | cleanup: | |
1182 | brelse(is.iloc.bh); | |
1183 | brelse(bs.bh); | |
4d20c685 | 1184 | if (no_expand == 0) |
19f5fb7a | 1185 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
617ba13b | 1186 | up_write(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
1187 | return error; |
1188 | } | |
1189 | ||
1190 | /* | |
617ba13b | 1191 | * ext4_xattr_set() |
ac27a0ec | 1192 | * |
617ba13b | 1193 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
1194 | * attribute modification is a filesystem transaction by itself. |
1195 | * | |
1196 | * Returns 0, or a negative error number on failure. | |
1197 | */ | |
1198 | int | |
617ba13b | 1199 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
1200 | const void *value, size_t value_len, int flags) |
1201 | { | |
1202 | handle_t *handle; | |
1203 | int error, retries = 0; | |
95eaefbd | 1204 | int credits = ext4_jbd2_credits_xattr(inode); |
ac27a0ec DK |
1205 | |
1206 | retry: | |
9924a92a | 1207 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
1208 | if (IS_ERR(handle)) { |
1209 | error = PTR_ERR(handle); | |
1210 | } else { | |
1211 | int error2; | |
1212 | ||
617ba13b | 1213 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 1214 | value, value_len, flags); |
617ba13b | 1215 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 1216 | if (error == -ENOSPC && |
617ba13b | 1217 | ext4_should_retry_alloc(inode->i_sb, &retries)) |
ac27a0ec DK |
1218 | goto retry; |
1219 | if (error == 0) | |
1220 | error = error2; | |
1221 | } | |
1222 | ||
1223 | return error; | |
1224 | } | |
1225 | ||
6dd4ee7c KS |
1226 | /* |
1227 | * Shift the EA entries in the inode to create space for the increased | |
1228 | * i_extra_isize. | |
1229 | */ | |
1230 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
1231 | int value_offs_shift, void *to, | |
1232 | void *from, size_t n, int blocksize) | |
1233 | { | |
1234 | struct ext4_xattr_entry *last = entry; | |
1235 | int new_offs; | |
1236 | ||
1237 | /* Adjust the value offsets of the entries */ | |
1238 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1239 | if (!last->e_value_block && last->e_value_size) { | |
1240 | new_offs = le16_to_cpu(last->e_value_offs) + | |
1241 | value_offs_shift; | |
1242 | BUG_ON(new_offs + le32_to_cpu(last->e_value_size) | |
1243 | > blocksize); | |
1244 | last->e_value_offs = cpu_to_le16(new_offs); | |
1245 | } | |
1246 | } | |
1247 | /* Shift the entries by n bytes */ | |
1248 | memmove(to, from, n); | |
1249 | } | |
1250 | ||
1251 | /* | |
1252 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
1253 | * Returns 0 on success or negative error number on failure. | |
1254 | */ | |
1255 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
1256 | struct ext4_inode *raw_inode, handle_t *handle) | |
1257 | { | |
1258 | struct ext4_xattr_ibody_header *header; | |
1259 | struct ext4_xattr_entry *entry, *last, *first; | |
1260 | struct buffer_head *bh = NULL; | |
1261 | struct ext4_xattr_ibody_find *is = NULL; | |
1262 | struct ext4_xattr_block_find *bs = NULL; | |
1263 | char *buffer = NULL, *b_entry_name = NULL; | |
1264 | size_t min_offs, free; | |
7b1b2c1b | 1265 | int total_ino; |
6dd4ee7c KS |
1266 | void *base, *start, *end; |
1267 | int extra_isize = 0, error = 0, tried_min_extra_isize = 0; | |
ac39849d | 1268 | int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); |
6dd4ee7c KS |
1269 | |
1270 | down_write(&EXT4_I(inode)->xattr_sem); | |
1271 | retry: | |
1272 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { | |
1273 | up_write(&EXT4_I(inode)->xattr_sem); | |
1274 | return 0; | |
1275 | } | |
1276 | ||
1277 | header = IHDR(inode, raw_inode); | |
1278 | entry = IFIRST(header); | |
1279 | ||
1280 | /* | |
1281 | * Check if enough free space is available in the inode to shift the | |
1282 | * entries ahead by new_extra_isize. | |
1283 | */ | |
1284 | ||
1285 | base = start = entry; | |
1286 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
1287 | min_offs = end - base; | |
1288 | last = entry; | |
1289 | total_ino = sizeof(struct ext4_xattr_ibody_header); | |
1290 | ||
1291 | free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); | |
1292 | if (free >= new_extra_isize) { | |
1293 | entry = IFIRST(header); | |
1294 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize | |
1295 | - new_extra_isize, (void *)raw_inode + | |
1296 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
1297 | (void *)header, total_ino, | |
1298 | inode->i_sb->s_blocksize); | |
1299 | EXT4_I(inode)->i_extra_isize = new_extra_isize; | |
1300 | error = 0; | |
1301 | goto cleanup; | |
1302 | } | |
1303 | ||
1304 | /* | |
1305 | * Enough free space isn't available in the inode, check if | |
1306 | * EA block can hold new_extra_isize bytes. | |
1307 | */ | |
1308 | if (EXT4_I(inode)->i_file_acl) { | |
1309 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
1310 | error = -EIO; | |
1311 | if (!bh) | |
1312 | goto cleanup; | |
cc8e94fd | 1313 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
1314 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1315 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 1316 | error = -EFSCORRUPTED; |
6dd4ee7c KS |
1317 | goto cleanup; |
1318 | } | |
1319 | base = BHDR(bh); | |
1320 | first = BFIRST(bh); | |
1321 | end = bh->b_data + bh->b_size; | |
1322 | min_offs = end - base; | |
7b1b2c1b | 1323 | free = ext4_xattr_free_space(first, &min_offs, base, NULL); |
6dd4ee7c KS |
1324 | if (free < new_extra_isize) { |
1325 | if (!tried_min_extra_isize && s_min_extra_isize) { | |
1326 | tried_min_extra_isize++; | |
1327 | new_extra_isize = s_min_extra_isize; | |
1328 | brelse(bh); | |
1329 | goto retry; | |
1330 | } | |
1331 | error = -1; | |
1332 | goto cleanup; | |
1333 | } | |
1334 | } else { | |
1335 | free = inode->i_sb->s_blocksize; | |
1336 | } | |
1337 | ||
1338 | while (new_extra_isize > 0) { | |
1339 | size_t offs, size, entry_size; | |
1340 | struct ext4_xattr_entry *small_entry = NULL; | |
1341 | struct ext4_xattr_info i = { | |
1342 | .value = NULL, | |
1343 | .value_len = 0, | |
1344 | }; | |
1345 | unsigned int total_size; /* EA entry size + value size */ | |
1346 | unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ | |
1347 | unsigned int min_total_size = ~0U; | |
1348 | ||
1349 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); | |
1350 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
1351 | if (!is || !bs) { | |
1352 | error = -ENOMEM; | |
1353 | goto cleanup; | |
1354 | } | |
1355 | ||
1356 | is->s.not_found = -ENODATA; | |
1357 | bs->s.not_found = -ENODATA; | |
1358 | is->iloc.bh = NULL; | |
1359 | bs->bh = NULL; | |
1360 | ||
1361 | last = IFIRST(header); | |
1362 | /* Find the entry best suited to be pushed into EA block */ | |
1363 | entry = NULL; | |
1364 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1365 | total_size = | |
1366 | EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + | |
1367 | EXT4_XATTR_LEN(last->e_name_len); | |
1368 | if (total_size <= free && total_size < min_total_size) { | |
1369 | if (total_size < new_extra_isize) { | |
1370 | small_entry = last; | |
1371 | } else { | |
1372 | entry = last; | |
1373 | min_total_size = total_size; | |
1374 | } | |
1375 | } | |
1376 | } | |
1377 | ||
1378 | if (entry == NULL) { | |
1379 | if (small_entry) { | |
1380 | entry = small_entry; | |
1381 | } else { | |
1382 | if (!tried_min_extra_isize && | |
1383 | s_min_extra_isize) { | |
1384 | tried_min_extra_isize++; | |
1385 | new_extra_isize = s_min_extra_isize; | |
6e4ea8e3 DJ |
1386 | kfree(is); is = NULL; |
1387 | kfree(bs); bs = NULL; | |
dcb9917b | 1388 | brelse(bh); |
6dd4ee7c KS |
1389 | goto retry; |
1390 | } | |
1391 | error = -1; | |
1392 | goto cleanup; | |
1393 | } | |
1394 | } | |
1395 | offs = le16_to_cpu(entry->e_value_offs); | |
1396 | size = le32_to_cpu(entry->e_value_size); | |
1397 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
1398 | i.name_index = entry->e_name_index, | |
1399 | buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); | |
1400 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
1401 | if (!buffer || !b_entry_name) { | |
1402 | error = -ENOMEM; | |
1403 | goto cleanup; | |
1404 | } | |
1405 | /* Save the entry name and the entry value */ | |
1406 | memcpy(buffer, (void *)IFIRST(header) + offs, | |
1407 | EXT4_XATTR_SIZE(size)); | |
1408 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); | |
1409 | b_entry_name[entry->e_name_len] = '\0'; | |
1410 | i.name = b_entry_name; | |
1411 | ||
1412 | error = ext4_get_inode_loc(inode, &is->iloc); | |
1413 | if (error) | |
1414 | goto cleanup; | |
1415 | ||
1416 | error = ext4_xattr_ibody_find(inode, &i, is); | |
1417 | if (error) | |
1418 | goto cleanup; | |
1419 | ||
1420 | /* Remove the chosen entry from the inode */ | |
1421 | error = ext4_xattr_ibody_set(handle, inode, &i, is); | |
9aaab058 RK |
1422 | if (error) |
1423 | goto cleanup; | |
6dd4ee7c KS |
1424 | |
1425 | entry = IFIRST(header); | |
1426 | if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) | |
1427 | shift_bytes = new_extra_isize; | |
1428 | else | |
1429 | shift_bytes = entry_size + size; | |
1430 | /* Adjust the offsets and shift the remaining entries ahead */ | |
1431 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - | |
1432 | shift_bytes, (void *)raw_inode + | |
1433 | EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, | |
1434 | (void *)header, total_ino - entry_size, | |
1435 | inode->i_sb->s_blocksize); | |
1436 | ||
1437 | extra_isize += shift_bytes; | |
1438 | new_extra_isize -= shift_bytes; | |
1439 | EXT4_I(inode)->i_extra_isize = extra_isize; | |
1440 | ||
1441 | i.name = b_entry_name; | |
1442 | i.value = buffer; | |
ac39849d | 1443 | i.value_len = size; |
6dd4ee7c KS |
1444 | error = ext4_xattr_block_find(inode, &i, bs); |
1445 | if (error) | |
1446 | goto cleanup; | |
1447 | ||
1448 | /* Add entry which was removed from the inode into the block */ | |
1449 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
1450 | if (error) | |
1451 | goto cleanup; | |
1452 | kfree(b_entry_name); | |
1453 | kfree(buffer); | |
d3533d72 JL |
1454 | b_entry_name = NULL; |
1455 | buffer = NULL; | |
6dd4ee7c KS |
1456 | brelse(is->iloc.bh); |
1457 | kfree(is); | |
1458 | kfree(bs); | |
1459 | } | |
1460 | brelse(bh); | |
1461 | up_write(&EXT4_I(inode)->xattr_sem); | |
1462 | return 0; | |
1463 | ||
1464 | cleanup: | |
1465 | kfree(b_entry_name); | |
1466 | kfree(buffer); | |
1467 | if (is) | |
1468 | brelse(is->iloc.bh); | |
1469 | kfree(is); | |
1470 | kfree(bs); | |
1471 | brelse(bh); | |
1472 | up_write(&EXT4_I(inode)->xattr_sem); | |
1473 | return error; | |
1474 | } | |
1475 | ||
1476 | ||
1477 | ||
ac27a0ec | 1478 | /* |
617ba13b | 1479 | * ext4_xattr_delete_inode() |
ac27a0ec DK |
1480 | * |
1481 | * Free extended attribute resources associated with this inode. This | |
1482 | * is called immediately before an inode is freed. We have exclusive | |
1483 | * access to the inode. | |
1484 | */ | |
1485 | void | |
617ba13b | 1486 | ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
1487 | { |
1488 | struct buffer_head *bh = NULL; | |
1489 | ||
617ba13b | 1490 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 1491 | goto cleanup; |
617ba13b | 1492 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec | 1493 | if (!bh) { |
24676da4 TT |
1494 | EXT4_ERROR_INODE(inode, "block %llu read error", |
1495 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1496 | goto cleanup; |
1497 | } | |
617ba13b | 1498 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 1499 | BHDR(bh)->h_blocks != cpu_to_le32(1)) { |
24676da4 TT |
1500 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1501 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1502 | goto cleanup; |
1503 | } | |
617ba13b MC |
1504 | ext4_xattr_release_block(handle, inode, bh); |
1505 | EXT4_I(inode)->i_file_acl = 0; | |
ac27a0ec DK |
1506 | |
1507 | cleanup: | |
1508 | brelse(bh); | |
1509 | } | |
1510 | ||
1511 | /* | |
617ba13b | 1512 | * ext4_xattr_put_super() |
ac27a0ec DK |
1513 | * |
1514 | * This is called when a file system is unmounted. | |
1515 | */ | |
1516 | void | |
617ba13b | 1517 | ext4_xattr_put_super(struct super_block *sb) |
ac27a0ec DK |
1518 | { |
1519 | mb_cache_shrink(sb->s_bdev); | |
1520 | } | |
1521 | ||
1522 | /* | |
617ba13b | 1523 | * ext4_xattr_cache_insert() |
ac27a0ec DK |
1524 | * |
1525 | * Create a new entry in the extended attribute cache, and insert | |
1526 | * it unless such an entry is already in the cache. | |
1527 | * | |
1528 | * Returns 0, or a negative error number on failure. | |
1529 | */ | |
1530 | static void | |
9c191f70 | 1531 | ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) |
ac27a0ec DK |
1532 | { |
1533 | __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); | |
1534 | struct mb_cache_entry *ce; | |
1535 | int error; | |
1536 | ||
9c191f70 | 1537 | ce = mb_cache_entry_alloc(ext4_mb_cache, GFP_NOFS); |
ac27a0ec DK |
1538 | if (!ce) { |
1539 | ea_bdebug(bh, "out of memory"); | |
1540 | return; | |
1541 | } | |
2aec7c52 | 1542 | error = mb_cache_entry_insert(ce, bh->b_bdev, bh->b_blocknr, hash); |
ac27a0ec DK |
1543 | if (error) { |
1544 | mb_cache_entry_free(ce); | |
1545 | if (error == -EBUSY) { | |
1546 | ea_bdebug(bh, "already in cache"); | |
1547 | error = 0; | |
1548 | } | |
1549 | } else { | |
1550 | ea_bdebug(bh, "inserting [%x]", (int)hash); | |
1551 | mb_cache_entry_release(ce); | |
1552 | } | |
1553 | } | |
1554 | ||
1555 | /* | |
617ba13b | 1556 | * ext4_xattr_cmp() |
ac27a0ec DK |
1557 | * |
1558 | * Compare two extended attribute blocks for equality. | |
1559 | * | |
1560 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
1561 | * a negative error number on errors. | |
1562 | */ | |
1563 | static int | |
617ba13b MC |
1564 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
1565 | struct ext4_xattr_header *header2) | |
ac27a0ec | 1566 | { |
617ba13b | 1567 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
1568 | |
1569 | entry1 = ENTRY(header1+1); | |
1570 | entry2 = ENTRY(header2+1); | |
1571 | while (!IS_LAST_ENTRY(entry1)) { | |
1572 | if (IS_LAST_ENTRY(entry2)) | |
1573 | return 1; | |
1574 | if (entry1->e_hash != entry2->e_hash || | |
1575 | entry1->e_name_index != entry2->e_name_index || | |
1576 | entry1->e_name_len != entry2->e_name_len || | |
1577 | entry1->e_value_size != entry2->e_value_size || | |
1578 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) | |
1579 | return 1; | |
1580 | if (entry1->e_value_block != 0 || entry2->e_value_block != 0) | |
6a797d27 | 1581 | return -EFSCORRUPTED; |
ac27a0ec DK |
1582 | if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), |
1583 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), | |
1584 | le32_to_cpu(entry1->e_value_size))) | |
1585 | return 1; | |
1586 | ||
617ba13b MC |
1587 | entry1 = EXT4_XATTR_NEXT(entry1); |
1588 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
1589 | } |
1590 | if (!IS_LAST_ENTRY(entry2)) | |
1591 | return 1; | |
1592 | return 0; | |
1593 | } | |
1594 | ||
1595 | /* | |
617ba13b | 1596 | * ext4_xattr_cache_find() |
ac27a0ec DK |
1597 | * |
1598 | * Find an identical extended attribute block. | |
1599 | * | |
1600 | * Returns a pointer to the block found, or NULL if such a block was | |
1601 | * not found or an error occurred. | |
1602 | */ | |
1603 | static struct buffer_head * | |
617ba13b | 1604 | ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, |
ac27a0ec DK |
1605 | struct mb_cache_entry **pce) |
1606 | { | |
1607 | __u32 hash = le32_to_cpu(header->h_hash); | |
1608 | struct mb_cache_entry *ce; | |
9c191f70 | 1609 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
1610 | |
1611 | if (!header->h_hash) | |
1612 | return NULL; /* never share */ | |
1613 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
1614 | again: | |
9c191f70 | 1615 | ce = mb_cache_entry_find_first(ext4_mb_cache, inode->i_sb->s_bdev, |
2aec7c52 | 1616 | hash); |
ac27a0ec DK |
1617 | while (ce) { |
1618 | struct buffer_head *bh; | |
1619 | ||
1620 | if (IS_ERR(ce)) { | |
1621 | if (PTR_ERR(ce) == -EAGAIN) | |
1622 | goto again; | |
1623 | break; | |
1624 | } | |
1625 | bh = sb_bread(inode->i_sb, ce->e_block); | |
1626 | if (!bh) { | |
24676da4 TT |
1627 | EXT4_ERROR_INODE(inode, "block %lu read error", |
1628 | (unsigned long) ce->e_block); | |
ac27a0ec | 1629 | } else if (le32_to_cpu(BHDR(bh)->h_refcount) >= |
617ba13b | 1630 | EXT4_XATTR_REFCOUNT_MAX) { |
ac27a0ec DK |
1631 | ea_idebug(inode, "block %lu refcount %d>=%d", |
1632 | (unsigned long) ce->e_block, | |
1633 | le32_to_cpu(BHDR(bh)->h_refcount), | |
617ba13b MC |
1634 | EXT4_XATTR_REFCOUNT_MAX); |
1635 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { | |
ac27a0ec DK |
1636 | *pce = ce; |
1637 | return bh; | |
1638 | } | |
1639 | brelse(bh); | |
2aec7c52 | 1640 | ce = mb_cache_entry_find_next(ce, inode->i_sb->s_bdev, hash); |
ac27a0ec DK |
1641 | } |
1642 | return NULL; | |
1643 | } | |
1644 | ||
1645 | #define NAME_HASH_SHIFT 5 | |
1646 | #define VALUE_HASH_SHIFT 16 | |
1647 | ||
1648 | /* | |
617ba13b | 1649 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
1650 | * |
1651 | * Compute the hash of an extended attribute. | |
1652 | */ | |
617ba13b MC |
1653 | static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, |
1654 | struct ext4_xattr_entry *entry) | |
ac27a0ec DK |
1655 | { |
1656 | __u32 hash = 0; | |
1657 | char *name = entry->e_name; | |
1658 | int n; | |
1659 | ||
2b2d6d01 | 1660 | for (n = 0; n < entry->e_name_len; n++) { |
ac27a0ec DK |
1661 | hash = (hash << NAME_HASH_SHIFT) ^ |
1662 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
1663 | *name++; | |
1664 | } | |
1665 | ||
1666 | if (entry->e_value_block == 0 && entry->e_value_size != 0) { | |
1667 | __le32 *value = (__le32 *)((char *)header + | |
1668 | le16_to_cpu(entry->e_value_offs)); | |
1669 | for (n = (le32_to_cpu(entry->e_value_size) + | |
617ba13b | 1670 | EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { |
ac27a0ec DK |
1671 | hash = (hash << VALUE_HASH_SHIFT) ^ |
1672 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
1673 | le32_to_cpu(*value++); | |
1674 | } | |
1675 | } | |
1676 | entry->e_hash = cpu_to_le32(hash); | |
1677 | } | |
1678 | ||
1679 | #undef NAME_HASH_SHIFT | |
1680 | #undef VALUE_HASH_SHIFT | |
1681 | ||
1682 | #define BLOCK_HASH_SHIFT 16 | |
1683 | ||
1684 | /* | |
617ba13b | 1685 | * ext4_xattr_rehash() |
ac27a0ec DK |
1686 | * |
1687 | * Re-compute the extended attribute hash value after an entry has changed. | |
1688 | */ | |
617ba13b MC |
1689 | static void ext4_xattr_rehash(struct ext4_xattr_header *header, |
1690 | struct ext4_xattr_entry *entry) | |
ac27a0ec | 1691 | { |
617ba13b | 1692 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
1693 | __u32 hash = 0; |
1694 | ||
617ba13b | 1695 | ext4_xattr_hash_entry(header, entry); |
ac27a0ec DK |
1696 | here = ENTRY(header+1); |
1697 | while (!IS_LAST_ENTRY(here)) { | |
1698 | if (!here->e_hash) { | |
1699 | /* Block is not shared if an entry's hash value == 0 */ | |
1700 | hash = 0; | |
1701 | break; | |
1702 | } | |
1703 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
1704 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
1705 | le32_to_cpu(here->e_hash); | |
617ba13b | 1706 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
1707 | } |
1708 | header->h_hash = cpu_to_le32(hash); | |
1709 | } | |
1710 | ||
1711 | #undef BLOCK_HASH_SHIFT | |
1712 | ||
9c191f70 M |
1713 | #define HASH_BUCKET_BITS 10 |
1714 | ||
1715 | struct mb_cache * | |
1716 | ext4_xattr_create_cache(char *name) | |
ac27a0ec | 1717 | { |
9c191f70 | 1718 | return mb_cache_create(name, HASH_BUCKET_BITS); |
ac27a0ec DK |
1719 | } |
1720 | ||
9c191f70 | 1721 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 1722 | { |
9c191f70 M |
1723 | if (cache) |
1724 | mb_cache_destroy(cache); | |
ac27a0ec | 1725 | } |
9c191f70 | 1726 |