Commit | Line | Data |
---|---|---|
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 |
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 { \ | |
a1c6f057 DM |
71 | printk(KERN_DEBUG "block %pg:%lu: ", \ |
72 | bh->b_bdev, (unsigned long) bh->b_blocknr); \ | |
ac27a0ec DK |
73 | printk(f); \ |
74 | printk("\n"); \ | |
75 | } while (0) | |
76 | #else | |
ace36ad4 JP |
77 | # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
78 | # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) | |
ac27a0ec DK |
79 | #endif |
80 | ||
7a2508e1 | 81 | static void ext4_xattr_cache_insert(struct mb_cache *, struct buffer_head *); |
617ba13b MC |
82 | static struct buffer_head *ext4_xattr_cache_find(struct inode *, |
83 | struct ext4_xattr_header *, | |
7a2508e1 | 84 | struct mb_cache_entry **); |
617ba13b MC |
85 | static void ext4_xattr_rehash(struct ext4_xattr_header *, |
86 | struct ext4_xattr_entry *); | |
431547b3 | 87 | static int ext4_xattr_list(struct dentry *dentry, char *buffer, |
d3a95d47 | 88 | size_t buffer_size); |
ac27a0ec | 89 | |
11e27528 | 90 | static const struct xattr_handler *ext4_xattr_handler_map[] = { |
617ba13b | 91 | [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, |
03010a33 | 92 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
93 | [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
94 | [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, | |
ac27a0ec | 95 | #endif |
617ba13b | 96 | [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, |
03010a33 | 97 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 98 | [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, |
ac27a0ec DK |
99 | #endif |
100 | }; | |
101 | ||
11e27528 | 102 | const struct xattr_handler *ext4_xattr_handlers[] = { |
617ba13b MC |
103 | &ext4_xattr_user_handler, |
104 | &ext4_xattr_trusted_handler, | |
03010a33 | 105 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
106 | &posix_acl_access_xattr_handler, |
107 | &posix_acl_default_xattr_handler, | |
ac27a0ec | 108 | #endif |
03010a33 | 109 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 110 | &ext4_xattr_security_handler, |
ac27a0ec DK |
111 | #endif |
112 | NULL | |
113 | }; | |
114 | ||
9c191f70 M |
115 | #define EXT4_GET_MB_CACHE(inode) (((struct ext4_sb_info *) \ |
116 | inode->i_sb->s_fs_info)->s_mb_cache) | |
117 | ||
cc8e94fd DW |
118 | static __le32 ext4_xattr_block_csum(struct inode *inode, |
119 | sector_t block_nr, | |
120 | struct ext4_xattr_header *hdr) | |
121 | { | |
122 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
d6a77105 TT |
123 | __u32 csum; |
124 | __le32 save_csum; | |
125 | __le64 dsk_block_nr = cpu_to_le64(block_nr); | |
cc8e94fd | 126 | |
d6a77105 | 127 | save_csum = hdr->h_checksum; |
cc8e94fd | 128 | hdr->h_checksum = 0; |
d6a77105 TT |
129 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, |
130 | sizeof(dsk_block_nr)); | |
cc8e94fd DW |
131 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr, |
132 | EXT4_BLOCK_SIZE(inode->i_sb)); | |
41eb70dd | 133 | |
d6a77105 | 134 | hdr->h_checksum = save_csum; |
cc8e94fd DW |
135 | return cpu_to_le32(csum); |
136 | } | |
137 | ||
138 | static int ext4_xattr_block_csum_verify(struct inode *inode, | |
139 | sector_t block_nr, | |
140 | struct ext4_xattr_header *hdr) | |
141 | { | |
9aa5d32b | 142 | if (ext4_has_metadata_csum(inode->i_sb) && |
cc8e94fd DW |
143 | (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr))) |
144 | return 0; | |
145 | return 1; | |
146 | } | |
147 | ||
148 | static void ext4_xattr_block_csum_set(struct inode *inode, | |
149 | sector_t block_nr, | |
150 | struct ext4_xattr_header *hdr) | |
151 | { | |
9aa5d32b | 152 | if (!ext4_has_metadata_csum(inode->i_sb)) |
cc8e94fd DW |
153 | return; |
154 | ||
155 | hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr); | |
156 | } | |
157 | ||
158 | static inline int ext4_handle_dirty_xattr_block(handle_t *handle, | |
159 | struct inode *inode, | |
160 | struct buffer_head *bh) | |
161 | { | |
162 | ext4_xattr_block_csum_set(inode, bh->b_blocknr, BHDR(bh)); | |
163 | return ext4_handle_dirty_metadata(handle, inode, bh); | |
164 | } | |
165 | ||
11e27528 | 166 | static inline const struct xattr_handler * |
617ba13b | 167 | ext4_xattr_handler(int name_index) |
ac27a0ec | 168 | { |
11e27528 | 169 | const struct xattr_handler *handler = NULL; |
ac27a0ec | 170 | |
617ba13b MC |
171 | if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
172 | handler = ext4_xattr_handler_map[name_index]; | |
ac27a0ec DK |
173 | return handler; |
174 | } | |
175 | ||
176 | /* | |
177 | * Inode operation listxattr() | |
178 | * | |
2b0143b5 | 179 | * d_inode(dentry)->i_mutex: don't care |
ac27a0ec DK |
180 | */ |
181 | ssize_t | |
617ba13b | 182 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) |
ac27a0ec | 183 | { |
431547b3 | 184 | return ext4_xattr_list(dentry, buffer, size); |
ac27a0ec DK |
185 | } |
186 | ||
187 | static int | |
a0626e75 DW |
188 | ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end, |
189 | void *value_start) | |
ac27a0ec | 190 | { |
a0626e75 DW |
191 | struct ext4_xattr_entry *e = entry; |
192 | ||
193 | while (!IS_LAST_ENTRY(e)) { | |
194 | struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); | |
ac27a0ec | 195 | if ((void *)next >= end) |
6a797d27 | 196 | return -EFSCORRUPTED; |
a0626e75 | 197 | e = next; |
ac27a0ec | 198 | } |
a0626e75 DW |
199 | |
200 | while (!IS_LAST_ENTRY(entry)) { | |
201 | if (entry->e_value_size != 0 && | |
202 | (value_start + le16_to_cpu(entry->e_value_offs) < | |
203 | (void *)e + sizeof(__u32) || | |
204 | value_start + le16_to_cpu(entry->e_value_offs) + | |
205 | le32_to_cpu(entry->e_value_size) > end)) | |
6a797d27 | 206 | return -EFSCORRUPTED; |
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; |
cc8e94fd | 224 | if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh))) |
6a797d27 | 225 | return -EFSBADCRC; |
a0626e75 DW |
226 | error = ext4_xattr_check_names(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 | { | |
237 | struct ext4_xattr_entry *entry = IFIRST(header); | |
238 | int error = -EFSCORRUPTED; | |
239 | ||
240 | if (((void *) header >= end) || | |
241 | (header->h_magic != le32_to_cpu(EXT4_XATTR_MAGIC))) | |
242 | goto errout; | |
243 | error = ext4_xattr_check_names(entry, end, entry); | |
244 | errout: | |
245 | if (error) | |
246 | __ext4_error_inode(inode, function, line, 0, | |
247 | "corrupted in-inode xattr"); | |
248 | return error; | |
249 | } | |
250 | ||
251 | #define xattr_check_inode(inode, header, end) \ | |
252 | __xattr_check_inode((inode), (header), (end), __func__, __LINE__) | |
253 | ||
ac27a0ec | 254 | static inline int |
617ba13b | 255 | ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) |
ac27a0ec DK |
256 | { |
257 | size_t value_size = le32_to_cpu(entry->e_value_size); | |
258 | ||
259 | if (entry->e_value_block != 0 || value_size > size || | |
260 | le16_to_cpu(entry->e_value_offs) + value_size > size) | |
6a797d27 | 261 | return -EFSCORRUPTED; |
ac27a0ec DK |
262 | return 0; |
263 | } | |
264 | ||
265 | static int | |
617ba13b | 266 | ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, |
ac27a0ec DK |
267 | const char *name, size_t size, int sorted) |
268 | { | |
617ba13b | 269 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
270 | size_t name_len; |
271 | int cmp = 1; | |
272 | ||
273 | if (name == NULL) | |
274 | return -EINVAL; | |
275 | name_len = strlen(name); | |
276 | entry = *pentry; | |
617ba13b | 277 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
ac27a0ec DK |
278 | cmp = name_index - entry->e_name_index; |
279 | if (!cmp) | |
280 | cmp = name_len - entry->e_name_len; | |
281 | if (!cmp) | |
282 | cmp = memcmp(name, entry->e_name, name_len); | |
283 | if (cmp <= 0 && (sorted || cmp == 0)) | |
284 | break; | |
285 | } | |
286 | *pentry = entry; | |
617ba13b | 287 | if (!cmp && ext4_xattr_check_entry(entry, size)) |
6a797d27 | 288 | return -EFSCORRUPTED; |
ac27a0ec DK |
289 | return cmp ? -ENODATA : 0; |
290 | } | |
291 | ||
292 | static int | |
617ba13b | 293 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
294 | void *buffer, size_t buffer_size) |
295 | { | |
296 | struct buffer_head *bh = NULL; | |
617ba13b | 297 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
298 | size_t size; |
299 | int error; | |
7a2508e1 | 300 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
301 | |
302 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
303 | name_index, name, buffer, (long)buffer_size); | |
304 | ||
305 | error = -ENODATA; | |
617ba13b | 306 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 307 | goto cleanup; |
ace36ad4 JP |
308 | ea_idebug(inode, "reading block %llu", |
309 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 310 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
311 | if (!bh) |
312 | goto cleanup; | |
313 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
314 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 315 | if (ext4_xattr_check_block(inode, bh)) { |
12062ddd | 316 | bad_block: |
24676da4 TT |
317 | EXT4_ERROR_INODE(inode, "bad block %llu", |
318 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 319 | error = -EFSCORRUPTED; |
ac27a0ec DK |
320 | goto cleanup; |
321 | } | |
9c191f70 | 322 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
ac27a0ec | 323 | entry = BFIRST(bh); |
617ba13b | 324 | error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); |
6a797d27 | 325 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
326 | goto bad_block; |
327 | if (error) | |
328 | goto cleanup; | |
329 | size = le32_to_cpu(entry->e_value_size); | |
330 | if (buffer) { | |
331 | error = -ERANGE; | |
332 | if (size > buffer_size) | |
333 | goto cleanup; | |
334 | memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), | |
335 | size); | |
336 | } | |
337 | error = size; | |
338 | ||
339 | cleanup: | |
340 | brelse(bh); | |
341 | return error; | |
342 | } | |
343 | ||
879b3825 | 344 | int |
617ba13b | 345 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
346 | void *buffer, size_t buffer_size) |
347 | { | |
617ba13b MC |
348 | struct ext4_xattr_ibody_header *header; |
349 | struct ext4_xattr_entry *entry; | |
350 | struct ext4_inode *raw_inode; | |
351 | struct ext4_iloc iloc; | |
ac27a0ec DK |
352 | size_t size; |
353 | void *end; | |
354 | int error; | |
355 | ||
19f5fb7a | 356 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 357 | return -ENODATA; |
617ba13b | 358 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
359 | if (error) |
360 | return error; | |
617ba13b | 361 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec DK |
362 | header = IHDR(inode, raw_inode); |
363 | entry = IFIRST(header); | |
617ba13b | 364 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 365 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
366 | if (error) |
367 | goto cleanup; | |
617ba13b | 368 | error = ext4_xattr_find_entry(&entry, name_index, name, |
ac27a0ec DK |
369 | end - (void *)entry, 0); |
370 | if (error) | |
371 | goto cleanup; | |
372 | size = le32_to_cpu(entry->e_value_size); | |
373 | if (buffer) { | |
374 | error = -ERANGE; | |
375 | if (size > buffer_size) | |
376 | goto cleanup; | |
377 | memcpy(buffer, (void *)IFIRST(header) + | |
378 | le16_to_cpu(entry->e_value_offs), size); | |
379 | } | |
380 | error = size; | |
381 | ||
382 | cleanup: | |
383 | brelse(iloc.bh); | |
384 | return error; | |
385 | } | |
386 | ||
387 | /* | |
617ba13b | 388 | * ext4_xattr_get() |
ac27a0ec DK |
389 | * |
390 | * Copy an extended attribute into the buffer | |
391 | * provided, or compute the buffer size required. | |
392 | * Buffer is NULL to compute the size of the buffer required. | |
393 | * | |
394 | * Returns a negative error number on failure, or the number of bytes | |
395 | * used / required on success. | |
396 | */ | |
397 | int | |
617ba13b | 398 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
399 | void *buffer, size_t buffer_size) |
400 | { | |
401 | int error; | |
402 | ||
230b8c1a ZZ |
403 | if (strlen(name) > 255) |
404 | return -ERANGE; | |
405 | ||
617ba13b MC |
406 | down_read(&EXT4_I(inode)->xattr_sem); |
407 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
408 | buffer_size); |
409 | if (error == -ENODATA) | |
617ba13b | 410 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 411 | buffer_size); |
617ba13b | 412 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
413 | return error; |
414 | } | |
415 | ||
416 | static int | |
431547b3 | 417 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
418 | char *buffer, size_t buffer_size) |
419 | { | |
420 | size_t rest = buffer_size; | |
421 | ||
617ba13b | 422 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 423 | const struct xattr_handler *handler = |
617ba13b | 424 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec | 425 | |
764a5c6b AG |
426 | if (handler && (!handler->list || handler->list(dentry))) { |
427 | const char *prefix = handler->prefix ?: handler->name; | |
428 | size_t prefix_len = strlen(prefix); | |
429 | size_t size = prefix_len + entry->e_name_len + 1; | |
430 | ||
ac27a0ec DK |
431 | if (buffer) { |
432 | if (size > rest) | |
433 | return -ERANGE; | |
764a5c6b AG |
434 | memcpy(buffer, prefix, prefix_len); |
435 | buffer += prefix_len; | |
436 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
437 | buffer += entry->e_name_len; | |
438 | *buffer++ = 0; | |
ac27a0ec DK |
439 | } |
440 | rest -= size; | |
441 | } | |
442 | } | |
764a5c6b | 443 | return buffer_size - rest; /* total size */ |
ac27a0ec DK |
444 | } |
445 | ||
446 | static int | |
431547b3 | 447 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 448 | { |
2b0143b5 | 449 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
450 | struct buffer_head *bh = NULL; |
451 | int error; | |
7a2508e1 | 452 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
453 | |
454 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
455 | buffer, (long)buffer_size); | |
456 | ||
457 | error = 0; | |
617ba13b | 458 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 459 | goto cleanup; |
ace36ad4 JP |
460 | ea_idebug(inode, "reading block %llu", |
461 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 462 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
463 | error = -EIO; |
464 | if (!bh) | |
465 | goto cleanup; | |
466 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
467 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 468 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
469 | EXT4_ERROR_INODE(inode, "bad block %llu", |
470 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 471 | error = -EFSCORRUPTED; |
ac27a0ec DK |
472 | goto cleanup; |
473 | } | |
9c191f70 | 474 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
431547b3 | 475 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); |
ac27a0ec DK |
476 | |
477 | cleanup: | |
478 | brelse(bh); | |
479 | ||
480 | return error; | |
481 | } | |
482 | ||
483 | static int | |
431547b3 | 484 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 485 | { |
2b0143b5 | 486 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
487 | struct ext4_xattr_ibody_header *header; |
488 | struct ext4_inode *raw_inode; | |
489 | struct ext4_iloc iloc; | |
ac27a0ec DK |
490 | void *end; |
491 | int error; | |
492 | ||
19f5fb7a | 493 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 494 | return 0; |
617ba13b | 495 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
496 | if (error) |
497 | return error; | |
617ba13b | 498 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 499 | header = IHDR(inode, raw_inode); |
617ba13b | 500 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 501 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
502 | if (error) |
503 | goto cleanup; | |
431547b3 | 504 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
505 | buffer, buffer_size); |
506 | ||
507 | cleanup: | |
508 | brelse(iloc.bh); | |
509 | return error; | |
510 | } | |
511 | ||
512 | /* | |
617ba13b | 513 | * ext4_xattr_list() |
ac27a0ec DK |
514 | * |
515 | * Copy a list of attribute names into the buffer | |
516 | * provided, or compute the buffer size required. | |
517 | * Buffer is NULL to compute the size of the buffer required. | |
518 | * | |
519 | * Returns a negative error number on failure, or the number of bytes | |
520 | * used / required on success. | |
521 | */ | |
d3a95d47 | 522 | static int |
431547b3 | 523 | ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 524 | { |
eaeef867 | 525 | int ret, ret2; |
ac27a0ec | 526 | |
2b0143b5 | 527 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
528 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
529 | if (ret < 0) | |
530 | goto errout; | |
531 | if (buffer) { | |
532 | buffer += ret; | |
533 | buffer_size -= ret; | |
ac27a0ec | 534 | } |
eaeef867 TT |
535 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
536 | if (ret < 0) | |
537 | goto errout; | |
538 | ret += ret2; | |
539 | errout: | |
2b0143b5 | 540 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 541 | return ret; |
ac27a0ec DK |
542 | } |
543 | ||
544 | /* | |
617ba13b | 545 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
546 | * not set, set it. |
547 | */ | |
617ba13b | 548 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
549 | struct super_block *sb) |
550 | { | |
e2b911c5 | 551 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
552 | return; |
553 | ||
5d601255 | 554 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 555 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
e2b911c5 | 556 | ext4_set_feature_xattr(sb); |
a0375156 | 557 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec | 558 | } |
ac27a0ec DK |
559 | } |
560 | ||
561 | /* | |
ec4cb1aa JK |
562 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
563 | * otherwise free the block. | |
ac27a0ec DK |
564 | */ |
565 | static void | |
617ba13b | 566 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
ac27a0ec DK |
567 | struct buffer_head *bh) |
568 | { | |
6048c64b AG |
569 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
570 | u32 hash, ref; | |
8a2bfdcb | 571 | int error = 0; |
ac27a0ec | 572 | |
5d601255 | 573 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
574 | error = ext4_journal_get_write_access(handle, bh); |
575 | if (error) | |
576 | goto out; | |
577 | ||
578 | lock_buffer(bh); | |
6048c64b AG |
579 | hash = le32_to_cpu(BHDR(bh)->h_hash); |
580 | ref = le32_to_cpu(BHDR(bh)->h_refcount); | |
581 | if (ref == 1) { | |
ac27a0ec | 582 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
583 | /* |
584 | * This must happen under buffer lock for | |
585 | * ext4_xattr_block_set() to reliably detect freed block | |
586 | */ | |
6048c64b | 587 | mb_cache_entry_delete_block(ext4_mb_cache, hash, bh->b_blocknr); |
ac27a0ec | 588 | get_bh(bh); |
ec4cb1aa | 589 | unlock_buffer(bh); |
e6362609 TT |
590 | ext4_free_blocks(handle, inode, bh, 0, 1, |
591 | EXT4_FREE_BLOCKS_METADATA | | |
592 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 593 | } else { |
6048c64b AG |
594 | ref--; |
595 | BHDR(bh)->h_refcount = cpu_to_le32(ref); | |
596 | if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { | |
597 | struct mb_cache_entry *ce; | |
598 | ||
599 | ce = mb_cache_entry_get(ext4_mb_cache, hash, | |
600 | bh->b_blocknr); | |
601 | if (ce) { | |
602 | ce->e_reusable = 1; | |
603 | mb_cache_entry_put(ext4_mb_cache, ce); | |
604 | } | |
605 | } | |
606 | ||
ec4cb1aa JK |
607 | /* |
608 | * Beware of this ugliness: Releasing of xattr block references | |
609 | * from different inodes can race and so we have to protect | |
610 | * from a race where someone else frees the block (and releases | |
611 | * its journal_head) before we are done dirtying the buffer. In | |
612 | * nojournal mode this race is harmless and we actually cannot | |
613 | * call ext4_handle_dirty_xattr_block() with locked buffer as | |
614 | * that function can call sync_dirty_buffer() so for that case | |
615 | * we handle the dirtying after unlocking the buffer. | |
616 | */ | |
617 | if (ext4_handle_valid(handle)) | |
618 | error = ext4_handle_dirty_xattr_block(handle, inode, | |
619 | bh); | |
c1bb05a6 | 620 | unlock_buffer(bh); |
ec4cb1aa JK |
621 | if (!ext4_handle_valid(handle)) |
622 | error = ext4_handle_dirty_xattr_block(handle, inode, | |
623 | bh); | |
8a2bfdcb | 624 | if (IS_SYNC(inode)) |
0390131b | 625 | ext4_handle_sync(handle); |
1231b3a1 | 626 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
627 | ea_bdebug(bh, "refcount now=%d; releasing", |
628 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 629 | } |
8a2bfdcb MC |
630 | out: |
631 | ext4_std_error(inode->i_sb, error); | |
632 | return; | |
ac27a0ec DK |
633 | } |
634 | ||
6dd4ee7c KS |
635 | /* |
636 | * Find the available free space for EAs. This also returns the total number of | |
637 | * bytes used by EA entries. | |
638 | */ | |
639 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
640 | size_t *min_offs, void *base, int *total) | |
641 | { | |
642 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
6dd4ee7c KS |
643 | if (!last->e_value_block && last->e_value_size) { |
644 | size_t offs = le16_to_cpu(last->e_value_offs); | |
645 | if (offs < *min_offs) | |
646 | *min_offs = offs; | |
647 | } | |
7b1b2c1b TT |
648 | if (total) |
649 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
650 | } |
651 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
652 | } | |
653 | ||
ac27a0ec | 654 | static int |
617ba13b | 655 | ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) |
ac27a0ec | 656 | { |
617ba13b | 657 | struct ext4_xattr_entry *last; |
ac27a0ec DK |
658 | size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); |
659 | ||
660 | /* Compute min_offs and last. */ | |
661 | last = s->first; | |
617ba13b | 662 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
ac27a0ec DK |
663 | if (!last->e_value_block && last->e_value_size) { |
664 | size_t offs = le16_to_cpu(last->e_value_offs); | |
665 | if (offs < min_offs) | |
666 | min_offs = offs; | |
667 | } | |
668 | } | |
669 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); | |
670 | if (!s->not_found) { | |
671 | if (!s->here->e_value_block && s->here->e_value_size) { | |
672 | size_t size = le32_to_cpu(s->here->e_value_size); | |
617ba13b | 673 | free += EXT4_XATTR_SIZE(size); |
ac27a0ec | 674 | } |
617ba13b | 675 | free += EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
676 | } |
677 | if (i->value) { | |
5f80f62a | 678 | if (free < EXT4_XATTR_LEN(name_len) + |
617ba13b | 679 | EXT4_XATTR_SIZE(i->value_len)) |
ac27a0ec DK |
680 | return -ENOSPC; |
681 | } | |
682 | ||
683 | if (i->value && s->not_found) { | |
684 | /* Insert the new name. */ | |
617ba13b | 685 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
686 | size_t rest = (void *)last - (void *)s->here + sizeof(__u32); |
687 | memmove((void *)s->here + size, s->here, rest); | |
688 | memset(s->here, 0, size); | |
689 | s->here->e_name_index = i->name_index; | |
690 | s->here->e_name_len = name_len; | |
691 | memcpy(s->here->e_name, i->name, name_len); | |
692 | } else { | |
693 | if (!s->here->e_value_block && s->here->e_value_size) { | |
694 | void *first_val = s->base + min_offs; | |
695 | size_t offs = le16_to_cpu(s->here->e_value_offs); | |
696 | void *val = s->base + offs; | |
617ba13b | 697 | size_t size = EXT4_XATTR_SIZE( |
ac27a0ec DK |
698 | le32_to_cpu(s->here->e_value_size)); |
699 | ||
617ba13b | 700 | if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { |
ac27a0ec DK |
701 | /* The old and the new value have the same |
702 | size. Just replace. */ | |
703 | s->here->e_value_size = | |
704 | cpu_to_le32(i->value_len); | |
bd9926e8 TT |
705 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
706 | memset(val, 0, size); | |
707 | } else { | |
708 | /* Clear pad bytes first. */ | |
709 | memset(val + size - EXT4_XATTR_PAD, 0, | |
710 | EXT4_XATTR_PAD); | |
711 | memcpy(val, i->value, i->value_len); | |
712 | } | |
ac27a0ec DK |
713 | return 0; |
714 | } | |
715 | ||
716 | /* Remove the old value. */ | |
717 | memmove(first_val + size, first_val, val - first_val); | |
718 | memset(first_val, 0, size); | |
719 | s->here->e_value_size = 0; | |
720 | s->here->e_value_offs = 0; | |
721 | min_offs += size; | |
722 | ||
723 | /* Adjust all value offsets. */ | |
724 | last = s->first; | |
725 | while (!IS_LAST_ENTRY(last)) { | |
726 | size_t o = le16_to_cpu(last->e_value_offs); | |
727 | if (!last->e_value_block && | |
728 | last->e_value_size && o < offs) | |
729 | last->e_value_offs = | |
730 | cpu_to_le16(o + size); | |
617ba13b | 731 | last = EXT4_XATTR_NEXT(last); |
ac27a0ec DK |
732 | } |
733 | } | |
734 | if (!i->value) { | |
735 | /* Remove the old name. */ | |
617ba13b | 736 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
737 | last = ENTRY((void *)last - size); |
738 | memmove(s->here, (void *)s->here + size, | |
739 | (void *)last - (void *)s->here + sizeof(__u32)); | |
740 | memset(last, 0, size); | |
741 | } | |
742 | } | |
743 | ||
744 | if (i->value) { | |
745 | /* Insert the new value. */ | |
746 | s->here->e_value_size = cpu_to_le32(i->value_len); | |
747 | if (i->value_len) { | |
617ba13b | 748 | size_t size = EXT4_XATTR_SIZE(i->value_len); |
ac27a0ec DK |
749 | void *val = s->base + min_offs - size; |
750 | s->here->e_value_offs = cpu_to_le16(min_offs - size); | |
bd9926e8 TT |
751 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
752 | memset(val, 0, size); | |
753 | } else { | |
754 | /* Clear the pad bytes first. */ | |
755 | memset(val + size - EXT4_XATTR_PAD, 0, | |
756 | EXT4_XATTR_PAD); | |
757 | memcpy(val, i->value, i->value_len); | |
758 | } | |
ac27a0ec DK |
759 | } |
760 | } | |
761 | return 0; | |
762 | } | |
763 | ||
617ba13b MC |
764 | struct ext4_xattr_block_find { |
765 | struct ext4_xattr_search s; | |
ac27a0ec DK |
766 | struct buffer_head *bh; |
767 | }; | |
768 | ||
769 | static int | |
617ba13b MC |
770 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
771 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
772 | { |
773 | struct super_block *sb = inode->i_sb; | |
774 | int error; | |
775 | ||
776 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
777 | i->name_index, i->name, i->value, (long)i->value_len); | |
778 | ||
617ba13b | 779 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 780 | /* The inode already has an extended attribute block. */ |
617ba13b | 781 | bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
782 | error = -EIO; |
783 | if (!bs->bh) | |
784 | goto cleanup; | |
785 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", | |
786 | atomic_read(&(bs->bh->b_count)), | |
787 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
cc8e94fd | 788 | if (ext4_xattr_check_block(inode, bs->bh)) { |
24676da4 TT |
789 | EXT4_ERROR_INODE(inode, "bad block %llu", |
790 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 791 | error = -EFSCORRUPTED; |
ac27a0ec DK |
792 | goto cleanup; |
793 | } | |
794 | /* Find the named attribute. */ | |
795 | bs->s.base = BHDR(bs->bh); | |
796 | bs->s.first = BFIRST(bs->bh); | |
797 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
798 | bs->s.here = bs->s.first; | |
617ba13b | 799 | error = ext4_xattr_find_entry(&bs->s.here, i->name_index, |
ac27a0ec DK |
800 | i->name, bs->bh->b_size, 1); |
801 | if (error && error != -ENODATA) | |
802 | goto cleanup; | |
803 | bs->s.not_found = error; | |
804 | } | |
805 | error = 0; | |
806 | ||
807 | cleanup: | |
808 | return error; | |
809 | } | |
810 | ||
811 | static int | |
617ba13b MC |
812 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
813 | struct ext4_xattr_info *i, | |
814 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
815 | { |
816 | struct super_block *sb = inode->i_sb; | |
817 | struct buffer_head *new_bh = NULL; | |
617ba13b | 818 | struct ext4_xattr_search *s = &bs->s; |
7a2508e1 | 819 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 820 | int error = 0; |
7a2508e1 | 821 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec | 822 | |
617ba13b | 823 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec DK |
824 | |
825 | if (i->value && i->value_len > sb->s_blocksize) | |
826 | return -ENOSPC; | |
827 | if (s->base) { | |
5d601255 | 828 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
829 | error = ext4_journal_get_write_access(handle, bs->bh); |
830 | if (error) | |
831 | goto cleanup; | |
832 | lock_buffer(bs->bh); | |
833 | ||
ac27a0ec | 834 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
835 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
836 | ||
837 | /* | |
838 | * This must happen under buffer lock for | |
839 | * ext4_xattr_block_set() to reliably detect modified | |
840 | * block | |
841 | */ | |
7a2508e1 JK |
842 | mb_cache_entry_delete_block(ext4_mb_cache, hash, |
843 | bs->bh->b_blocknr); | |
ac27a0ec | 844 | ea_bdebug(bs->bh, "modifying in-place"); |
617ba13b | 845 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
846 | if (!error) { |
847 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 848 | ext4_xattr_rehash(header(s->base), |
ac27a0ec | 849 | s->here); |
9c191f70 M |
850 | ext4_xattr_cache_insert(ext4_mb_cache, |
851 | bs->bh); | |
ac27a0ec DK |
852 | } |
853 | unlock_buffer(bs->bh); | |
6a797d27 | 854 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
855 | goto bad_block; |
856 | if (!error) | |
cc8e94fd DW |
857 | error = ext4_handle_dirty_xattr_block(handle, |
858 | inode, | |
859 | bs->bh); | |
ac27a0ec DK |
860 | if (error) |
861 | goto cleanup; | |
862 | goto inserted; | |
863 | } else { | |
864 | int offset = (char *)s->here - bs->bh->b_data; | |
865 | ||
8a2bfdcb | 866 | unlock_buffer(bs->bh); |
ac27a0ec | 867 | ea_bdebug(bs->bh, "cloning"); |
216553c4 | 868 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
869 | error = -ENOMEM; |
870 | if (s->base == NULL) | |
871 | goto cleanup; | |
872 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
873 | s->first = ENTRY(header(s->base)+1); | |
874 | header(s->base)->h_refcount = cpu_to_le32(1); | |
875 | s->here = ENTRY(s->base + offset); | |
876 | s->end = s->base + bs->bh->b_size; | |
877 | } | |
878 | } else { | |
879 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 880 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
881 | /* assert(header == s->base) */ |
882 | error = -ENOMEM; | |
883 | if (s->base == NULL) | |
884 | goto cleanup; | |
617ba13b | 885 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
886 | header(s->base)->h_blocks = cpu_to_le32(1); |
887 | header(s->base)->h_refcount = cpu_to_le32(1); | |
888 | s->first = ENTRY(header(s->base)+1); | |
889 | s->here = ENTRY(header(s->base)+1); | |
890 | s->end = s->base + sb->s_blocksize; | |
891 | } | |
892 | ||
617ba13b | 893 | error = ext4_xattr_set_entry(i, s); |
6a797d27 | 894 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
895 | goto bad_block; |
896 | if (error) | |
897 | goto cleanup; | |
898 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 899 | ext4_xattr_rehash(header(s->base), s->here); |
ac27a0ec DK |
900 | |
901 | inserted: | |
902 | if (!IS_LAST_ENTRY(s->first)) { | |
617ba13b | 903 | new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); |
ac27a0ec DK |
904 | if (new_bh) { |
905 | /* We found an identical block in the cache. */ | |
906 | if (new_bh == bs->bh) | |
907 | ea_bdebug(new_bh, "keeping"); | |
908 | else { | |
6048c64b AG |
909 | u32 ref; |
910 | ||
ac27a0ec DK |
911 | /* The old block is released after updating |
912 | the inode. */ | |
1231b3a1 LC |
913 | error = dquot_alloc_block(inode, |
914 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 915 | if (error) |
ac27a0ec | 916 | goto cleanup; |
5d601255 | 917 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 918 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
919 | new_bh); |
920 | if (error) | |
921 | goto cleanup_dquot; | |
922 | lock_buffer(new_bh); | |
82939d79 JK |
923 | /* |
924 | * We have to be careful about races with | |
6048c64b AG |
925 | * freeing, rehashing or adding references to |
926 | * xattr block. Once we hold buffer lock xattr | |
927 | * block's state is stable so we can check | |
928 | * whether the block got freed / rehashed or | |
929 | * not. Since we unhash mbcache entry under | |
930 | * buffer lock when freeing / rehashing xattr | |
931 | * block, checking whether entry is still | |
932 | * hashed is reliable. Same rules hold for | |
933 | * e_reusable handling. | |
82939d79 | 934 | */ |
6048c64b AG |
935 | if (hlist_bl_unhashed(&ce->e_hash_list) || |
936 | !ce->e_reusable) { | |
82939d79 JK |
937 | /* |
938 | * Undo everything and check mbcache | |
939 | * again. | |
940 | */ | |
941 | unlock_buffer(new_bh); | |
942 | dquot_free_block(inode, | |
943 | EXT4_C2B(EXT4_SB(sb), | |
944 | 1)); | |
945 | brelse(new_bh); | |
7a2508e1 | 946 | mb_cache_entry_put(ext4_mb_cache, ce); |
82939d79 JK |
947 | ce = NULL; |
948 | new_bh = NULL; | |
949 | goto inserted; | |
950 | } | |
6048c64b AG |
951 | ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
952 | BHDR(new_bh)->h_refcount = cpu_to_le32(ref); | |
953 | if (ref >= EXT4_XATTR_REFCOUNT_MAX) | |
954 | ce->e_reusable = 0; | |
ac27a0ec | 955 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
6048c64b | 956 | ref); |
ac27a0ec | 957 | unlock_buffer(new_bh); |
cc8e94fd DW |
958 | error = ext4_handle_dirty_xattr_block(handle, |
959 | inode, | |
960 | new_bh); | |
ac27a0ec DK |
961 | if (error) |
962 | goto cleanup_dquot; | |
963 | } | |
7a2508e1 JK |
964 | mb_cache_entry_touch(ext4_mb_cache, ce); |
965 | mb_cache_entry_put(ext4_mb_cache, ce); | |
ac27a0ec DK |
966 | ce = NULL; |
967 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
968 | /* We were modifying this block in-place. */ | |
969 | ea_bdebug(bs->bh, "keeping this block"); | |
970 | new_bh = bs->bh; | |
971 | get_bh(new_bh); | |
972 | } else { | |
973 | /* We need to allocate a new block */ | |
fb0a387d ES |
974 | ext4_fsblk_t goal, block; |
975 | ||
976 | goal = ext4_group_first_block_no(sb, | |
d00a6d7b | 977 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
978 | |
979 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 980 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
981 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
982 | ||
55f020db AH |
983 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
984 | NULL, &error); | |
ac27a0ec DK |
985 | if (error) |
986 | goto cleanup; | |
fb0a387d | 987 | |
12e9b892 | 988 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
989 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
990 | ||
ace36ad4 JP |
991 | ea_idebug(inode, "creating block %llu", |
992 | (unsigned long long)block); | |
ac27a0ec DK |
993 | |
994 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 995 | if (unlikely(!new_bh)) { |
860d21e2 | 996 | error = -ENOMEM; |
ac27a0ec | 997 | getblk_failed: |
7dc57615 | 998 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 999 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
1000 | goto cleanup; |
1001 | } | |
1002 | lock_buffer(new_bh); | |
617ba13b | 1003 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
1004 | if (error) { |
1005 | unlock_buffer(new_bh); | |
860d21e2 | 1006 | error = -EIO; |
ac27a0ec DK |
1007 | goto getblk_failed; |
1008 | } | |
1009 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
1010 | set_buffer_uptodate(new_bh); | |
1011 | unlock_buffer(new_bh); | |
9c191f70 | 1012 | ext4_xattr_cache_insert(ext4_mb_cache, new_bh); |
cc8e94fd DW |
1013 | error = ext4_handle_dirty_xattr_block(handle, |
1014 | inode, new_bh); | |
ac27a0ec DK |
1015 | if (error) |
1016 | goto cleanup; | |
1017 | } | |
1018 | } | |
1019 | ||
1020 | /* Update the inode. */ | |
617ba13b | 1021 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
1022 | |
1023 | /* Drop the previous xattr block. */ | |
1024 | if (bs->bh && bs->bh != new_bh) | |
617ba13b | 1025 | ext4_xattr_release_block(handle, inode, bs->bh); |
ac27a0ec DK |
1026 | error = 0; |
1027 | ||
1028 | cleanup: | |
1029 | if (ce) | |
7a2508e1 | 1030 | mb_cache_entry_put(ext4_mb_cache, ce); |
ac27a0ec DK |
1031 | brelse(new_bh); |
1032 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
1033 | kfree(s->base); | |
1034 | ||
1035 | return error; | |
1036 | ||
1037 | cleanup_dquot: | |
1231b3a1 | 1038 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
1039 | goto cleanup; |
1040 | ||
1041 | bad_block: | |
24676da4 TT |
1042 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1043 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1044 | goto cleanup; |
1045 | ||
1046 | #undef header | |
1047 | } | |
1048 | ||
879b3825 TM |
1049 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
1050 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 1051 | { |
617ba13b MC |
1052 | struct ext4_xattr_ibody_header *header; |
1053 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
1054 | int error; |
1055 | ||
617ba13b | 1056 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1057 | return 0; |
617ba13b | 1058 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
1059 | header = IHDR(inode, raw_inode); |
1060 | is->s.base = is->s.first = IFIRST(header); | |
1061 | is->s.here = is->s.first; | |
617ba13b | 1062 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 1063 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
9e92f48c | 1064 | error = xattr_check_inode(inode, header, is->s.end); |
ac27a0ec DK |
1065 | if (error) |
1066 | return error; | |
1067 | /* Find the named attribute. */ | |
617ba13b | 1068 | error = ext4_xattr_find_entry(&is->s.here, i->name_index, |
ac27a0ec DK |
1069 | i->name, is->s.end - |
1070 | (void *)is->s.base, 0); | |
1071 | if (error && error != -ENODATA) | |
1072 | return error; | |
1073 | is->s.not_found = error; | |
1074 | } | |
1075 | return 0; | |
1076 | } | |
1077 | ||
0d812f77 TM |
1078 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
1079 | struct ext4_xattr_info *i, | |
1080 | struct ext4_xattr_ibody_find *is) | |
1081 | { | |
1082 | struct ext4_xattr_ibody_header *header; | |
1083 | struct ext4_xattr_search *s = &is->s; | |
1084 | int error; | |
1085 | ||
1086 | if (EXT4_I(inode)->i_extra_isize == 0) | |
1087 | return -ENOSPC; | |
1088 | error = ext4_xattr_set_entry(i, s); | |
1089 | if (error) { | |
1090 | if (error == -ENOSPC && | |
1091 | ext4_has_inline_data(inode)) { | |
1092 | error = ext4_try_to_evict_inline_data(handle, inode, | |
1093 | EXT4_XATTR_LEN(strlen(i->name) + | |
1094 | EXT4_XATTR_SIZE(i->value_len))); | |
1095 | if (error) | |
1096 | return error; | |
1097 | error = ext4_xattr_ibody_find(inode, i, is); | |
1098 | if (error) | |
1099 | return error; | |
1100 | error = ext4_xattr_set_entry(i, s); | |
1101 | } | |
1102 | if (error) | |
1103 | return error; | |
1104 | } | |
1105 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); | |
1106 | if (!IS_LAST_ENTRY(s->first)) { | |
1107 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
1108 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
1109 | } else { | |
1110 | header->h_magic = cpu_to_le32(0); | |
1111 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
1112 | } | |
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, | |
1117 | struct ext4_xattr_info *i, | |
1118 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 1119 | { |
617ba13b MC |
1120 | struct ext4_xattr_ibody_header *header; |
1121 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
1122 | int error; |
1123 | ||
617ba13b | 1124 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1125 | return -ENOSPC; |
617ba13b | 1126 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
1127 | if (error) |
1128 | return error; | |
617ba13b | 1129 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 1130 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 1131 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 1132 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1133 | } else { |
1134 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 1135 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1136 | } |
1137 | return 0; | |
1138 | } | |
1139 | ||
3fd16462 JK |
1140 | static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
1141 | struct ext4_xattr_info *i) | |
1142 | { | |
1143 | void *value; | |
1144 | ||
1145 | if (le32_to_cpu(s->here->e_value_size) != i->value_len) | |
1146 | return 0; | |
1147 | value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); | |
1148 | return !memcmp(value, i->value, i->value_len); | |
1149 | } | |
1150 | ||
ac27a0ec | 1151 | /* |
617ba13b | 1152 | * ext4_xattr_set_handle() |
ac27a0ec | 1153 | * |
6e9510b0 | 1154 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
1155 | * is NULL to remove an existing extended attribute, and non-NULL to |
1156 | * either replace an existing extended attribute, or create a new extended | |
1157 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
1158 | * specify that an extended attribute must exist and must not exist | |
1159 | * previous to the call, respectively. | |
1160 | * | |
1161 | * Returns 0, or a negative error number on failure. | |
1162 | */ | |
1163 | int | |
617ba13b | 1164 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
1165 | const char *name, const void *value, size_t value_len, |
1166 | int flags) | |
1167 | { | |
617ba13b | 1168 | struct ext4_xattr_info i = { |
ac27a0ec DK |
1169 | .name_index = name_index, |
1170 | .name = name, | |
1171 | .value = value, | |
1172 | .value_len = value_len, | |
1173 | ||
1174 | }; | |
617ba13b | 1175 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
1176 | .s = { .not_found = -ENODATA, }, |
1177 | }; | |
617ba13b | 1178 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
1179 | .s = { .not_found = -ENODATA, }, |
1180 | }; | |
4d20c685 | 1181 | unsigned long no_expand; |
ac27a0ec DK |
1182 | int error; |
1183 | ||
1184 | if (!name) | |
1185 | return -EINVAL; | |
1186 | if (strlen(name) > 255) | |
1187 | return -ERANGE; | |
617ba13b | 1188 | down_write(&EXT4_I(inode)->xattr_sem); |
19f5fb7a TT |
1189 | no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); |
1190 | ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); | |
4d20c685 | 1191 | |
66543617 | 1192 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
1193 | if (error) |
1194 | goto cleanup; | |
1195 | ||
19f5fb7a | 1196 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
1197 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
1198 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 1199 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
1200 | } |
1201 | ||
617ba13b | 1202 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
1203 | if (error) |
1204 | goto cleanup; | |
1205 | if (is.s.not_found) | |
617ba13b | 1206 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
1207 | if (error) |
1208 | goto cleanup; | |
1209 | if (is.s.not_found && bs.s.not_found) { | |
1210 | error = -ENODATA; | |
1211 | if (flags & XATTR_REPLACE) | |
1212 | goto cleanup; | |
1213 | error = 0; | |
1214 | if (!value) | |
1215 | goto cleanup; | |
1216 | } else { | |
1217 | error = -EEXIST; | |
1218 | if (flags & XATTR_CREATE) | |
1219 | goto cleanup; | |
1220 | } | |
ac27a0ec DK |
1221 | if (!value) { |
1222 | if (!is.s.not_found) | |
617ba13b | 1223 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 1224 | else if (!bs.s.not_found) |
617ba13b | 1225 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1226 | } else { |
3fd16462 JK |
1227 | error = 0; |
1228 | /* Xattr value did not change? Save us some work and bail out */ | |
1229 | if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) | |
1230 | goto cleanup; | |
1231 | if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) | |
1232 | goto cleanup; | |
1233 | ||
617ba13b | 1234 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
1235 | if (!error && !bs.s.not_found) { |
1236 | i.value = NULL; | |
617ba13b | 1237 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1238 | } else if (error == -ENOSPC) { |
7e01c8e5 TY |
1239 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
1240 | error = ext4_xattr_block_find(inode, &i, &bs); | |
1241 | if (error) | |
1242 | goto cleanup; | |
1243 | } | |
617ba13b | 1244 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec DK |
1245 | if (error) |
1246 | goto cleanup; | |
1247 | if (!is.s.not_found) { | |
1248 | i.value = NULL; | |
617ba13b | 1249 | error = ext4_xattr_ibody_set(handle, inode, &i, |
ac27a0ec DK |
1250 | &is); |
1251 | } | |
1252 | } | |
1253 | } | |
1254 | if (!error) { | |
617ba13b | 1255 | ext4_xattr_update_super_block(handle, inode->i_sb); |
ef7f3835 | 1256 | inode->i_ctime = ext4_current_time(inode); |
6dd4ee7c | 1257 | if (!value) |
19f5fb7a | 1258 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
617ba13b | 1259 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 1260 | /* |
617ba13b | 1261 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
1262 | * error != 0. |
1263 | */ | |
1264 | is.iloc.bh = NULL; | |
1265 | if (IS_SYNC(inode)) | |
0390131b | 1266 | ext4_handle_sync(handle); |
ac27a0ec DK |
1267 | } |
1268 | ||
1269 | cleanup: | |
1270 | brelse(is.iloc.bh); | |
1271 | brelse(bs.bh); | |
4d20c685 | 1272 | if (no_expand == 0) |
19f5fb7a | 1273 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
617ba13b | 1274 | up_write(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
1275 | return error; |
1276 | } | |
1277 | ||
1278 | /* | |
617ba13b | 1279 | * ext4_xattr_set() |
ac27a0ec | 1280 | * |
617ba13b | 1281 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
1282 | * attribute modification is a filesystem transaction by itself. |
1283 | * | |
1284 | * Returns 0, or a negative error number on failure. | |
1285 | */ | |
1286 | int | |
617ba13b | 1287 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
1288 | const void *value, size_t value_len, int flags) |
1289 | { | |
1290 | handle_t *handle; | |
1291 | int error, retries = 0; | |
95eaefbd | 1292 | int credits = ext4_jbd2_credits_xattr(inode); |
ac27a0ec DK |
1293 | |
1294 | retry: | |
9924a92a | 1295 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
1296 | if (IS_ERR(handle)) { |
1297 | error = PTR_ERR(handle); | |
1298 | } else { | |
1299 | int error2; | |
1300 | ||
617ba13b | 1301 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 1302 | value, value_len, flags); |
617ba13b | 1303 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 1304 | if (error == -ENOSPC && |
617ba13b | 1305 | ext4_should_retry_alloc(inode->i_sb, &retries)) |
ac27a0ec DK |
1306 | goto retry; |
1307 | if (error == 0) | |
1308 | error = error2; | |
1309 | } | |
1310 | ||
1311 | return error; | |
1312 | } | |
1313 | ||
6dd4ee7c KS |
1314 | /* |
1315 | * Shift the EA entries in the inode to create space for the increased | |
1316 | * i_extra_isize. | |
1317 | */ | |
1318 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
1319 | int value_offs_shift, void *to, | |
1320 | void *from, size_t n, int blocksize) | |
1321 | { | |
1322 | struct ext4_xattr_entry *last = entry; | |
1323 | int new_offs; | |
1324 | ||
1325 | /* Adjust the value offsets of the entries */ | |
1326 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1327 | if (!last->e_value_block && last->e_value_size) { | |
1328 | new_offs = le16_to_cpu(last->e_value_offs) + | |
1329 | value_offs_shift; | |
1330 | BUG_ON(new_offs + le32_to_cpu(last->e_value_size) | |
1331 | > blocksize); | |
1332 | last->e_value_offs = cpu_to_le16(new_offs); | |
1333 | } | |
1334 | } | |
1335 | /* Shift the entries by n bytes */ | |
1336 | memmove(to, from, n); | |
1337 | } | |
1338 | ||
1339 | /* | |
1340 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
1341 | * Returns 0 on success or negative error number on failure. | |
1342 | */ | |
1343 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
1344 | struct ext4_inode *raw_inode, handle_t *handle) | |
1345 | { | |
1346 | struct ext4_xattr_ibody_header *header; | |
1347 | struct ext4_xattr_entry *entry, *last, *first; | |
1348 | struct buffer_head *bh = NULL; | |
1349 | struct ext4_xattr_ibody_find *is = NULL; | |
1350 | struct ext4_xattr_block_find *bs = NULL; | |
1351 | char *buffer = NULL, *b_entry_name = NULL; | |
1352 | size_t min_offs, free; | |
7b1b2c1b | 1353 | int total_ino; |
6dd4ee7c KS |
1354 | void *base, *start, *end; |
1355 | int extra_isize = 0, error = 0, tried_min_extra_isize = 0; | |
ac39849d | 1356 | int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); |
6dd4ee7c KS |
1357 | |
1358 | down_write(&EXT4_I(inode)->xattr_sem); | |
1359 | retry: | |
1360 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { | |
1361 | up_write(&EXT4_I(inode)->xattr_sem); | |
1362 | return 0; | |
1363 | } | |
1364 | ||
1365 | header = IHDR(inode, raw_inode); | |
1366 | entry = IFIRST(header); | |
1367 | ||
1368 | /* | |
1369 | * Check if enough free space is available in the inode to shift the | |
1370 | * entries ahead by new_extra_isize. | |
1371 | */ | |
1372 | ||
1373 | base = start = entry; | |
1374 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
1375 | min_offs = end - base; | |
1376 | last = entry; | |
1377 | total_ino = sizeof(struct ext4_xattr_ibody_header); | |
1378 | ||
9e92f48c TT |
1379 | error = xattr_check_inode(inode, header, end); |
1380 | if (error) | |
1381 | goto cleanup; | |
1382 | ||
6dd4ee7c KS |
1383 | free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); |
1384 | if (free >= new_extra_isize) { | |
1385 | entry = IFIRST(header); | |
1386 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize | |
1387 | - new_extra_isize, (void *)raw_inode + | |
1388 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
1389 | (void *)header, total_ino, | |
1390 | inode->i_sb->s_blocksize); | |
1391 | EXT4_I(inode)->i_extra_isize = new_extra_isize; | |
1392 | error = 0; | |
1393 | goto cleanup; | |
1394 | } | |
1395 | ||
1396 | /* | |
1397 | * Enough free space isn't available in the inode, check if | |
1398 | * EA block can hold new_extra_isize bytes. | |
1399 | */ | |
1400 | if (EXT4_I(inode)->i_file_acl) { | |
1401 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
1402 | error = -EIO; | |
1403 | if (!bh) | |
1404 | goto cleanup; | |
cc8e94fd | 1405 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
1406 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1407 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 1408 | error = -EFSCORRUPTED; |
6dd4ee7c KS |
1409 | goto cleanup; |
1410 | } | |
1411 | base = BHDR(bh); | |
1412 | first = BFIRST(bh); | |
1413 | end = bh->b_data + bh->b_size; | |
1414 | min_offs = end - base; | |
7b1b2c1b | 1415 | free = ext4_xattr_free_space(first, &min_offs, base, NULL); |
6dd4ee7c KS |
1416 | if (free < new_extra_isize) { |
1417 | if (!tried_min_extra_isize && s_min_extra_isize) { | |
1418 | tried_min_extra_isize++; | |
1419 | new_extra_isize = s_min_extra_isize; | |
1420 | brelse(bh); | |
1421 | goto retry; | |
1422 | } | |
1423 | error = -1; | |
1424 | goto cleanup; | |
1425 | } | |
1426 | } else { | |
1427 | free = inode->i_sb->s_blocksize; | |
1428 | } | |
1429 | ||
1430 | while (new_extra_isize > 0) { | |
1431 | size_t offs, size, entry_size; | |
1432 | struct ext4_xattr_entry *small_entry = NULL; | |
1433 | struct ext4_xattr_info i = { | |
1434 | .value = NULL, | |
1435 | .value_len = 0, | |
1436 | }; | |
1437 | unsigned int total_size; /* EA entry size + value size */ | |
1438 | unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ | |
1439 | unsigned int min_total_size = ~0U; | |
1440 | ||
1441 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); | |
1442 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
1443 | if (!is || !bs) { | |
1444 | error = -ENOMEM; | |
1445 | goto cleanup; | |
1446 | } | |
1447 | ||
1448 | is->s.not_found = -ENODATA; | |
1449 | bs->s.not_found = -ENODATA; | |
1450 | is->iloc.bh = NULL; | |
1451 | bs->bh = NULL; | |
1452 | ||
1453 | last = IFIRST(header); | |
1454 | /* Find the entry best suited to be pushed into EA block */ | |
1455 | entry = NULL; | |
1456 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1457 | total_size = | |
1458 | EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + | |
1459 | EXT4_XATTR_LEN(last->e_name_len); | |
1460 | if (total_size <= free && total_size < min_total_size) { | |
1461 | if (total_size < new_extra_isize) { | |
1462 | small_entry = last; | |
1463 | } else { | |
1464 | entry = last; | |
1465 | min_total_size = total_size; | |
1466 | } | |
1467 | } | |
1468 | } | |
1469 | ||
1470 | if (entry == NULL) { | |
1471 | if (small_entry) { | |
1472 | entry = small_entry; | |
1473 | } else { | |
1474 | if (!tried_min_extra_isize && | |
1475 | s_min_extra_isize) { | |
1476 | tried_min_extra_isize++; | |
1477 | new_extra_isize = s_min_extra_isize; | |
6e4ea8e3 DJ |
1478 | kfree(is); is = NULL; |
1479 | kfree(bs); bs = NULL; | |
dcb9917b | 1480 | brelse(bh); |
6dd4ee7c KS |
1481 | goto retry; |
1482 | } | |
1483 | error = -1; | |
1484 | goto cleanup; | |
1485 | } | |
1486 | } | |
1487 | offs = le16_to_cpu(entry->e_value_offs); | |
1488 | size = le32_to_cpu(entry->e_value_size); | |
1489 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
1490 | i.name_index = entry->e_name_index, | |
1491 | buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); | |
1492 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
1493 | if (!buffer || !b_entry_name) { | |
1494 | error = -ENOMEM; | |
1495 | goto cleanup; | |
1496 | } | |
1497 | /* Save the entry name and the entry value */ | |
1498 | memcpy(buffer, (void *)IFIRST(header) + offs, | |
1499 | EXT4_XATTR_SIZE(size)); | |
1500 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); | |
1501 | b_entry_name[entry->e_name_len] = '\0'; | |
1502 | i.name = b_entry_name; | |
1503 | ||
1504 | error = ext4_get_inode_loc(inode, &is->iloc); | |
1505 | if (error) | |
1506 | goto cleanup; | |
1507 | ||
1508 | error = ext4_xattr_ibody_find(inode, &i, is); | |
1509 | if (error) | |
1510 | goto cleanup; | |
1511 | ||
1512 | /* Remove the chosen entry from the inode */ | |
1513 | error = ext4_xattr_ibody_set(handle, inode, &i, is); | |
9aaab058 RK |
1514 | if (error) |
1515 | goto cleanup; | |
6dd4ee7c KS |
1516 | |
1517 | entry = IFIRST(header); | |
1518 | if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) | |
1519 | shift_bytes = new_extra_isize; | |
1520 | else | |
1521 | shift_bytes = entry_size + size; | |
1522 | /* Adjust the offsets and shift the remaining entries ahead */ | |
1523 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - | |
1524 | shift_bytes, (void *)raw_inode + | |
1525 | EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, | |
1526 | (void *)header, total_ino - entry_size, | |
1527 | inode->i_sb->s_blocksize); | |
1528 | ||
1529 | extra_isize += shift_bytes; | |
1530 | new_extra_isize -= shift_bytes; | |
1531 | EXT4_I(inode)->i_extra_isize = extra_isize; | |
1532 | ||
1533 | i.name = b_entry_name; | |
1534 | i.value = buffer; | |
ac39849d | 1535 | i.value_len = size; |
6dd4ee7c KS |
1536 | error = ext4_xattr_block_find(inode, &i, bs); |
1537 | if (error) | |
1538 | goto cleanup; | |
1539 | ||
1540 | /* Add entry which was removed from the inode into the block */ | |
1541 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
1542 | if (error) | |
1543 | goto cleanup; | |
1544 | kfree(b_entry_name); | |
1545 | kfree(buffer); | |
d3533d72 JL |
1546 | b_entry_name = NULL; |
1547 | buffer = NULL; | |
6dd4ee7c KS |
1548 | brelse(is->iloc.bh); |
1549 | kfree(is); | |
1550 | kfree(bs); | |
1551 | } | |
1552 | brelse(bh); | |
1553 | up_write(&EXT4_I(inode)->xattr_sem); | |
1554 | return 0; | |
1555 | ||
1556 | cleanup: | |
1557 | kfree(b_entry_name); | |
1558 | kfree(buffer); | |
1559 | if (is) | |
1560 | brelse(is->iloc.bh); | |
1561 | kfree(is); | |
1562 | kfree(bs); | |
1563 | brelse(bh); | |
1564 | up_write(&EXT4_I(inode)->xattr_sem); | |
1565 | return error; | |
1566 | } | |
1567 | ||
1568 | ||
1569 | ||
ac27a0ec | 1570 | /* |
617ba13b | 1571 | * ext4_xattr_delete_inode() |
ac27a0ec DK |
1572 | * |
1573 | * Free extended attribute resources associated with this inode. This | |
1574 | * is called immediately before an inode is freed. We have exclusive | |
1575 | * access to the inode. | |
1576 | */ | |
1577 | void | |
617ba13b | 1578 | ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
1579 | { |
1580 | struct buffer_head *bh = NULL; | |
1581 | ||
617ba13b | 1582 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 1583 | goto cleanup; |
617ba13b | 1584 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec | 1585 | if (!bh) { |
24676da4 TT |
1586 | EXT4_ERROR_INODE(inode, "block %llu read error", |
1587 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1588 | goto cleanup; |
1589 | } | |
617ba13b | 1590 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 1591 | BHDR(bh)->h_blocks != cpu_to_le32(1)) { |
24676da4 TT |
1592 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1593 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1594 | goto cleanup; |
1595 | } | |
617ba13b MC |
1596 | ext4_xattr_release_block(handle, inode, bh); |
1597 | EXT4_I(inode)->i_file_acl = 0; | |
ac27a0ec DK |
1598 | |
1599 | cleanup: | |
1600 | brelse(bh); | |
1601 | } | |
1602 | ||
ac27a0ec | 1603 | /* |
617ba13b | 1604 | * ext4_xattr_cache_insert() |
ac27a0ec DK |
1605 | * |
1606 | * Create a new entry in the extended attribute cache, and insert | |
1607 | * it unless such an entry is already in the cache. | |
1608 | * | |
1609 | * Returns 0, or a negative error number on failure. | |
1610 | */ | |
1611 | static void | |
7a2508e1 | 1612 | ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) |
ac27a0ec | 1613 | { |
6048c64b AG |
1614 | struct ext4_xattr_header *header = BHDR(bh); |
1615 | __u32 hash = le32_to_cpu(header->h_hash); | |
1616 | int reusable = le32_to_cpu(header->h_refcount) < | |
1617 | EXT4_XATTR_REFCOUNT_MAX; | |
ac27a0ec DK |
1618 | int error; |
1619 | ||
7a2508e1 | 1620 | error = mb_cache_entry_create(ext4_mb_cache, GFP_NOFS, hash, |
6048c64b | 1621 | bh->b_blocknr, reusable); |
ac27a0ec | 1622 | if (error) { |
82939d79 | 1623 | if (error == -EBUSY) |
ac27a0ec | 1624 | ea_bdebug(bh, "already in cache"); |
82939d79 | 1625 | } else |
ac27a0ec | 1626 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
1627 | } |
1628 | ||
1629 | /* | |
617ba13b | 1630 | * ext4_xattr_cmp() |
ac27a0ec DK |
1631 | * |
1632 | * Compare two extended attribute blocks for equality. | |
1633 | * | |
1634 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
1635 | * a negative error number on errors. | |
1636 | */ | |
1637 | static int | |
617ba13b MC |
1638 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
1639 | struct ext4_xattr_header *header2) | |
ac27a0ec | 1640 | { |
617ba13b | 1641 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
1642 | |
1643 | entry1 = ENTRY(header1+1); | |
1644 | entry2 = ENTRY(header2+1); | |
1645 | while (!IS_LAST_ENTRY(entry1)) { | |
1646 | if (IS_LAST_ENTRY(entry2)) | |
1647 | return 1; | |
1648 | if (entry1->e_hash != entry2->e_hash || | |
1649 | entry1->e_name_index != entry2->e_name_index || | |
1650 | entry1->e_name_len != entry2->e_name_len || | |
1651 | entry1->e_value_size != entry2->e_value_size || | |
1652 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) | |
1653 | return 1; | |
1654 | if (entry1->e_value_block != 0 || entry2->e_value_block != 0) | |
6a797d27 | 1655 | return -EFSCORRUPTED; |
ac27a0ec DK |
1656 | if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), |
1657 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), | |
1658 | le32_to_cpu(entry1->e_value_size))) | |
1659 | return 1; | |
1660 | ||
617ba13b MC |
1661 | entry1 = EXT4_XATTR_NEXT(entry1); |
1662 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
1663 | } |
1664 | if (!IS_LAST_ENTRY(entry2)) | |
1665 | return 1; | |
1666 | return 0; | |
1667 | } | |
1668 | ||
1669 | /* | |
617ba13b | 1670 | * ext4_xattr_cache_find() |
ac27a0ec DK |
1671 | * |
1672 | * Find an identical extended attribute block. | |
1673 | * | |
1674 | * Returns a pointer to the block found, or NULL if such a block was | |
1675 | * not found or an error occurred. | |
1676 | */ | |
1677 | static struct buffer_head * | |
617ba13b | 1678 | ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, |
7a2508e1 | 1679 | struct mb_cache_entry **pce) |
ac27a0ec DK |
1680 | { |
1681 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 JK |
1682 | struct mb_cache_entry *ce; |
1683 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); | |
ac27a0ec DK |
1684 | |
1685 | if (!header->h_hash) | |
1686 | return NULL; /* never share */ | |
1687 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
7a2508e1 | 1688 | ce = mb_cache_entry_find_first(ext4_mb_cache, hash); |
ac27a0ec DK |
1689 | while (ce) { |
1690 | struct buffer_head *bh; | |
1691 | ||
ac27a0ec DK |
1692 | bh = sb_bread(inode->i_sb, ce->e_block); |
1693 | if (!bh) { | |
24676da4 TT |
1694 | EXT4_ERROR_INODE(inode, "block %lu read error", |
1695 | (unsigned long) ce->e_block); | |
617ba13b | 1696 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
ac27a0ec DK |
1697 | *pce = ce; |
1698 | return bh; | |
1699 | } | |
1700 | brelse(bh); | |
7a2508e1 | 1701 | ce = mb_cache_entry_find_next(ext4_mb_cache, ce); |
ac27a0ec DK |
1702 | } |
1703 | return NULL; | |
1704 | } | |
1705 | ||
1706 | #define NAME_HASH_SHIFT 5 | |
1707 | #define VALUE_HASH_SHIFT 16 | |
1708 | ||
1709 | /* | |
617ba13b | 1710 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
1711 | * |
1712 | * Compute the hash of an extended attribute. | |
1713 | */ | |
617ba13b MC |
1714 | static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, |
1715 | struct ext4_xattr_entry *entry) | |
ac27a0ec DK |
1716 | { |
1717 | __u32 hash = 0; | |
1718 | char *name = entry->e_name; | |
1719 | int n; | |
1720 | ||
2b2d6d01 | 1721 | for (n = 0; n < entry->e_name_len; n++) { |
ac27a0ec DK |
1722 | hash = (hash << NAME_HASH_SHIFT) ^ |
1723 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
1724 | *name++; | |
1725 | } | |
1726 | ||
1727 | if (entry->e_value_block == 0 && entry->e_value_size != 0) { | |
1728 | __le32 *value = (__le32 *)((char *)header + | |
1729 | le16_to_cpu(entry->e_value_offs)); | |
1730 | for (n = (le32_to_cpu(entry->e_value_size) + | |
617ba13b | 1731 | EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { |
ac27a0ec DK |
1732 | hash = (hash << VALUE_HASH_SHIFT) ^ |
1733 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
1734 | le32_to_cpu(*value++); | |
1735 | } | |
1736 | } | |
1737 | entry->e_hash = cpu_to_le32(hash); | |
1738 | } | |
1739 | ||
1740 | #undef NAME_HASH_SHIFT | |
1741 | #undef VALUE_HASH_SHIFT | |
1742 | ||
1743 | #define BLOCK_HASH_SHIFT 16 | |
1744 | ||
1745 | /* | |
617ba13b | 1746 | * ext4_xattr_rehash() |
ac27a0ec DK |
1747 | * |
1748 | * Re-compute the extended attribute hash value after an entry has changed. | |
1749 | */ | |
617ba13b MC |
1750 | static void ext4_xattr_rehash(struct ext4_xattr_header *header, |
1751 | struct ext4_xattr_entry *entry) | |
ac27a0ec | 1752 | { |
617ba13b | 1753 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
1754 | __u32 hash = 0; |
1755 | ||
617ba13b | 1756 | ext4_xattr_hash_entry(header, entry); |
ac27a0ec DK |
1757 | here = ENTRY(header+1); |
1758 | while (!IS_LAST_ENTRY(here)) { | |
1759 | if (!here->e_hash) { | |
1760 | /* Block is not shared if an entry's hash value == 0 */ | |
1761 | hash = 0; | |
1762 | break; | |
1763 | } | |
1764 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
1765 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
1766 | le32_to_cpu(here->e_hash); | |
617ba13b | 1767 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
1768 | } |
1769 | header->h_hash = cpu_to_le32(hash); | |
1770 | } | |
1771 | ||
1772 | #undef BLOCK_HASH_SHIFT | |
1773 | ||
9c191f70 M |
1774 | #define HASH_BUCKET_BITS 10 |
1775 | ||
7a2508e1 | 1776 | struct mb_cache * |
82939d79 | 1777 | ext4_xattr_create_cache(void) |
ac27a0ec | 1778 | { |
7a2508e1 | 1779 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
1780 | } |
1781 | ||
7a2508e1 | 1782 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 1783 | { |
9c191f70 | 1784 | if (cache) |
7a2508e1 | 1785 | mb_cache_destroy(cache); |
ac27a0ec | 1786 | } |
9c191f70 | 1787 |