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 | ||
233 | static inline int | |
617ba13b | 234 | ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) |
ac27a0ec DK |
235 | { |
236 | size_t value_size = le32_to_cpu(entry->e_value_size); | |
237 | ||
238 | if (entry->e_value_block != 0 || value_size > size || | |
239 | le16_to_cpu(entry->e_value_offs) + value_size > size) | |
6a797d27 | 240 | return -EFSCORRUPTED; |
ac27a0ec DK |
241 | return 0; |
242 | } | |
243 | ||
244 | static int | |
617ba13b | 245 | ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, |
ac27a0ec DK |
246 | const char *name, size_t size, int sorted) |
247 | { | |
617ba13b | 248 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
249 | size_t name_len; |
250 | int cmp = 1; | |
251 | ||
252 | if (name == NULL) | |
253 | return -EINVAL; | |
254 | name_len = strlen(name); | |
255 | entry = *pentry; | |
617ba13b | 256 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
ac27a0ec DK |
257 | cmp = name_index - entry->e_name_index; |
258 | if (!cmp) | |
259 | cmp = name_len - entry->e_name_len; | |
260 | if (!cmp) | |
261 | cmp = memcmp(name, entry->e_name, name_len); | |
262 | if (cmp <= 0 && (sorted || cmp == 0)) | |
263 | break; | |
264 | } | |
265 | *pentry = entry; | |
617ba13b | 266 | if (!cmp && ext4_xattr_check_entry(entry, size)) |
6a797d27 | 267 | return -EFSCORRUPTED; |
ac27a0ec DK |
268 | return cmp ? -ENODATA : 0; |
269 | } | |
270 | ||
271 | static int | |
617ba13b | 272 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
273 | void *buffer, size_t buffer_size) |
274 | { | |
275 | struct buffer_head *bh = NULL; | |
617ba13b | 276 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
277 | size_t size; |
278 | int error; | |
7a2508e1 | 279 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
280 | |
281 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
282 | name_index, name, buffer, (long)buffer_size); | |
283 | ||
284 | error = -ENODATA; | |
617ba13b | 285 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 286 | goto cleanup; |
ace36ad4 JP |
287 | ea_idebug(inode, "reading block %llu", |
288 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 289 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
290 | if (!bh) |
291 | goto cleanup; | |
292 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
293 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 294 | if (ext4_xattr_check_block(inode, bh)) { |
12062ddd | 295 | bad_block: |
24676da4 TT |
296 | EXT4_ERROR_INODE(inode, "bad block %llu", |
297 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 298 | error = -EFSCORRUPTED; |
ac27a0ec DK |
299 | goto cleanup; |
300 | } | |
9c191f70 | 301 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
ac27a0ec | 302 | entry = BFIRST(bh); |
617ba13b | 303 | error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); |
6a797d27 | 304 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
305 | goto bad_block; |
306 | if (error) | |
307 | goto cleanup; | |
308 | size = le32_to_cpu(entry->e_value_size); | |
309 | if (buffer) { | |
310 | error = -ERANGE; | |
311 | if (size > buffer_size) | |
312 | goto cleanup; | |
313 | memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), | |
314 | size); | |
315 | } | |
316 | error = size; | |
317 | ||
318 | cleanup: | |
319 | brelse(bh); | |
320 | return error; | |
321 | } | |
322 | ||
879b3825 | 323 | int |
617ba13b | 324 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
325 | void *buffer, size_t buffer_size) |
326 | { | |
617ba13b MC |
327 | struct ext4_xattr_ibody_header *header; |
328 | struct ext4_xattr_entry *entry; | |
329 | struct ext4_inode *raw_inode; | |
330 | struct ext4_iloc iloc; | |
ac27a0ec DK |
331 | size_t size; |
332 | void *end; | |
333 | int error; | |
334 | ||
19f5fb7a | 335 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 336 | return -ENODATA; |
617ba13b | 337 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
338 | if (error) |
339 | return error; | |
617ba13b | 340 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec DK |
341 | header = IHDR(inode, raw_inode); |
342 | entry = IFIRST(header); | |
617ba13b | 343 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
a0626e75 | 344 | error = ext4_xattr_check_names(entry, end, entry); |
ac27a0ec DK |
345 | if (error) |
346 | goto cleanup; | |
617ba13b | 347 | error = ext4_xattr_find_entry(&entry, name_index, name, |
ac27a0ec DK |
348 | end - (void *)entry, 0); |
349 | if (error) | |
350 | goto cleanup; | |
351 | size = le32_to_cpu(entry->e_value_size); | |
352 | if (buffer) { | |
353 | error = -ERANGE; | |
354 | if (size > buffer_size) | |
355 | goto cleanup; | |
356 | memcpy(buffer, (void *)IFIRST(header) + | |
357 | le16_to_cpu(entry->e_value_offs), size); | |
358 | } | |
359 | error = size; | |
360 | ||
361 | cleanup: | |
362 | brelse(iloc.bh); | |
363 | return error; | |
364 | } | |
365 | ||
366 | /* | |
617ba13b | 367 | * ext4_xattr_get() |
ac27a0ec DK |
368 | * |
369 | * Copy an extended attribute into the buffer | |
370 | * provided, or compute the buffer size required. | |
371 | * Buffer is NULL to compute the size of the buffer required. | |
372 | * | |
373 | * Returns a negative error number on failure, or the number of bytes | |
374 | * used / required on success. | |
375 | */ | |
376 | int | |
617ba13b | 377 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
378 | void *buffer, size_t buffer_size) |
379 | { | |
380 | int error; | |
381 | ||
230b8c1a ZZ |
382 | if (strlen(name) > 255) |
383 | return -ERANGE; | |
384 | ||
617ba13b MC |
385 | down_read(&EXT4_I(inode)->xattr_sem); |
386 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
387 | buffer_size); |
388 | if (error == -ENODATA) | |
617ba13b | 389 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 390 | buffer_size); |
617ba13b | 391 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
392 | return error; |
393 | } | |
394 | ||
395 | static int | |
431547b3 | 396 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
397 | char *buffer, size_t buffer_size) |
398 | { | |
399 | size_t rest = buffer_size; | |
400 | ||
617ba13b | 401 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 402 | const struct xattr_handler *handler = |
617ba13b | 403 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec | 404 | |
764a5c6b AG |
405 | if (handler && (!handler->list || handler->list(dentry))) { |
406 | const char *prefix = handler->prefix ?: handler->name; | |
407 | size_t prefix_len = strlen(prefix); | |
408 | size_t size = prefix_len + entry->e_name_len + 1; | |
409 | ||
ac27a0ec DK |
410 | if (buffer) { |
411 | if (size > rest) | |
412 | return -ERANGE; | |
764a5c6b AG |
413 | memcpy(buffer, prefix, prefix_len); |
414 | buffer += prefix_len; | |
415 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
416 | buffer += entry->e_name_len; | |
417 | *buffer++ = 0; | |
ac27a0ec DK |
418 | } |
419 | rest -= size; | |
420 | } | |
421 | } | |
764a5c6b | 422 | return buffer_size - rest; /* total size */ |
ac27a0ec DK |
423 | } |
424 | ||
425 | static int | |
431547b3 | 426 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 427 | { |
2b0143b5 | 428 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
429 | struct buffer_head *bh = NULL; |
430 | int error; | |
7a2508e1 | 431 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
432 | |
433 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
434 | buffer, (long)buffer_size); | |
435 | ||
436 | error = 0; | |
617ba13b | 437 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 438 | goto cleanup; |
ace36ad4 JP |
439 | ea_idebug(inode, "reading block %llu", |
440 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 441 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
442 | error = -EIO; |
443 | if (!bh) | |
444 | goto cleanup; | |
445 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
446 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 447 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
448 | EXT4_ERROR_INODE(inode, "bad block %llu", |
449 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 450 | error = -EFSCORRUPTED; |
ac27a0ec DK |
451 | goto cleanup; |
452 | } | |
9c191f70 | 453 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
431547b3 | 454 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); |
ac27a0ec DK |
455 | |
456 | cleanup: | |
457 | brelse(bh); | |
458 | ||
459 | return error; | |
460 | } | |
461 | ||
462 | static int | |
431547b3 | 463 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 464 | { |
2b0143b5 | 465 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
466 | struct ext4_xattr_ibody_header *header; |
467 | struct ext4_inode *raw_inode; | |
468 | struct ext4_iloc iloc; | |
ac27a0ec DK |
469 | void *end; |
470 | int error; | |
471 | ||
19f5fb7a | 472 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 473 | return 0; |
617ba13b | 474 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
475 | if (error) |
476 | return error; | |
617ba13b | 477 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 478 | header = IHDR(inode, raw_inode); |
617ba13b | 479 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
a0626e75 | 480 | error = ext4_xattr_check_names(IFIRST(header), end, IFIRST(header)); |
ac27a0ec DK |
481 | if (error) |
482 | goto cleanup; | |
431547b3 | 483 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
484 | buffer, buffer_size); |
485 | ||
486 | cleanup: | |
487 | brelse(iloc.bh); | |
488 | return error; | |
489 | } | |
490 | ||
491 | /* | |
617ba13b | 492 | * ext4_xattr_list() |
ac27a0ec DK |
493 | * |
494 | * Copy a list of attribute names into the buffer | |
495 | * provided, or compute the buffer size required. | |
496 | * Buffer is NULL to compute the size of the buffer required. | |
497 | * | |
498 | * Returns a negative error number on failure, or the number of bytes | |
499 | * used / required on success. | |
500 | */ | |
d3a95d47 | 501 | static int |
431547b3 | 502 | ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 503 | { |
eaeef867 | 504 | int ret, ret2; |
ac27a0ec | 505 | |
2b0143b5 | 506 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
507 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
508 | if (ret < 0) | |
509 | goto errout; | |
510 | if (buffer) { | |
511 | buffer += ret; | |
512 | buffer_size -= ret; | |
ac27a0ec | 513 | } |
eaeef867 TT |
514 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
515 | if (ret < 0) | |
516 | goto errout; | |
517 | ret += ret2; | |
518 | errout: | |
2b0143b5 | 519 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 520 | return ret; |
ac27a0ec DK |
521 | } |
522 | ||
523 | /* | |
617ba13b | 524 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
525 | * not set, set it. |
526 | */ | |
617ba13b | 527 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
528 | struct super_block *sb) |
529 | { | |
e2b911c5 | 530 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
531 | return; |
532 | ||
5d601255 | 533 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 534 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
e2b911c5 | 535 | ext4_set_feature_xattr(sb); |
a0375156 | 536 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec | 537 | } |
ac27a0ec DK |
538 | } |
539 | ||
540 | /* | |
ec4cb1aa JK |
541 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
542 | * otherwise free the block. | |
ac27a0ec DK |
543 | */ |
544 | static void | |
617ba13b | 545 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
ac27a0ec DK |
546 | struct buffer_head *bh) |
547 | { | |
6048c64b AG |
548 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
549 | u32 hash, ref; | |
8a2bfdcb | 550 | int error = 0; |
ac27a0ec | 551 | |
5d601255 | 552 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
553 | error = ext4_journal_get_write_access(handle, bh); |
554 | if (error) | |
555 | goto out; | |
556 | ||
557 | lock_buffer(bh); | |
6048c64b AG |
558 | hash = le32_to_cpu(BHDR(bh)->h_hash); |
559 | ref = le32_to_cpu(BHDR(bh)->h_refcount); | |
560 | if (ref == 1) { | |
ac27a0ec | 561 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
562 | /* |
563 | * This must happen under buffer lock for | |
564 | * ext4_xattr_block_set() to reliably detect freed block | |
565 | */ | |
6048c64b | 566 | mb_cache_entry_delete_block(ext4_mb_cache, hash, bh->b_blocknr); |
ac27a0ec | 567 | get_bh(bh); |
ec4cb1aa | 568 | unlock_buffer(bh); |
e6362609 TT |
569 | ext4_free_blocks(handle, inode, bh, 0, 1, |
570 | EXT4_FREE_BLOCKS_METADATA | | |
571 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 572 | } else { |
6048c64b AG |
573 | ref--; |
574 | BHDR(bh)->h_refcount = cpu_to_le32(ref); | |
575 | if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { | |
576 | struct mb_cache_entry *ce; | |
577 | ||
578 | ce = mb_cache_entry_get(ext4_mb_cache, hash, | |
579 | bh->b_blocknr); | |
580 | if (ce) { | |
581 | ce->e_reusable = 1; | |
582 | mb_cache_entry_put(ext4_mb_cache, ce); | |
583 | } | |
584 | } | |
585 | ||
ec4cb1aa JK |
586 | /* |
587 | * Beware of this ugliness: Releasing of xattr block references | |
588 | * from different inodes can race and so we have to protect | |
589 | * from a race where someone else frees the block (and releases | |
590 | * its journal_head) before we are done dirtying the buffer. In | |
591 | * nojournal mode this race is harmless and we actually cannot | |
592 | * call ext4_handle_dirty_xattr_block() with locked buffer as | |
593 | * that function can call sync_dirty_buffer() so for that case | |
594 | * we handle the dirtying after unlocking the buffer. | |
595 | */ | |
596 | if (ext4_handle_valid(handle)) | |
597 | error = ext4_handle_dirty_xattr_block(handle, inode, | |
598 | bh); | |
c1bb05a6 | 599 | unlock_buffer(bh); |
ec4cb1aa JK |
600 | if (!ext4_handle_valid(handle)) |
601 | error = ext4_handle_dirty_xattr_block(handle, inode, | |
602 | bh); | |
8a2bfdcb | 603 | if (IS_SYNC(inode)) |
0390131b | 604 | ext4_handle_sync(handle); |
1231b3a1 | 605 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
606 | ea_bdebug(bh, "refcount now=%d; releasing", |
607 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 608 | } |
8a2bfdcb MC |
609 | out: |
610 | ext4_std_error(inode->i_sb, error); | |
611 | return; | |
ac27a0ec DK |
612 | } |
613 | ||
6dd4ee7c KS |
614 | /* |
615 | * Find the available free space for EAs. This also returns the total number of | |
616 | * bytes used by EA entries. | |
617 | */ | |
618 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
619 | size_t *min_offs, void *base, int *total) | |
620 | { | |
621 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
6dd4ee7c KS |
622 | if (!last->e_value_block && last->e_value_size) { |
623 | size_t offs = le16_to_cpu(last->e_value_offs); | |
624 | if (offs < *min_offs) | |
625 | *min_offs = offs; | |
626 | } | |
7b1b2c1b TT |
627 | if (total) |
628 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
629 | } |
630 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
631 | } | |
632 | ||
ac27a0ec | 633 | static int |
617ba13b | 634 | ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) |
ac27a0ec | 635 | { |
617ba13b | 636 | struct ext4_xattr_entry *last; |
ac27a0ec DK |
637 | size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); |
638 | ||
639 | /* Compute min_offs and last. */ | |
640 | last = s->first; | |
617ba13b | 641 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
ac27a0ec DK |
642 | if (!last->e_value_block && last->e_value_size) { |
643 | size_t offs = le16_to_cpu(last->e_value_offs); | |
644 | if (offs < min_offs) | |
645 | min_offs = offs; | |
646 | } | |
647 | } | |
648 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); | |
649 | if (!s->not_found) { | |
650 | if (!s->here->e_value_block && s->here->e_value_size) { | |
651 | size_t size = le32_to_cpu(s->here->e_value_size); | |
617ba13b | 652 | free += EXT4_XATTR_SIZE(size); |
ac27a0ec | 653 | } |
617ba13b | 654 | free += EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
655 | } |
656 | if (i->value) { | |
5f80f62a | 657 | if (free < EXT4_XATTR_LEN(name_len) + |
617ba13b | 658 | EXT4_XATTR_SIZE(i->value_len)) |
ac27a0ec DK |
659 | return -ENOSPC; |
660 | } | |
661 | ||
662 | if (i->value && s->not_found) { | |
663 | /* Insert the new name. */ | |
617ba13b | 664 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
665 | size_t rest = (void *)last - (void *)s->here + sizeof(__u32); |
666 | memmove((void *)s->here + size, s->here, rest); | |
667 | memset(s->here, 0, size); | |
668 | s->here->e_name_index = i->name_index; | |
669 | s->here->e_name_len = name_len; | |
670 | memcpy(s->here->e_name, i->name, name_len); | |
671 | } else { | |
672 | if (!s->here->e_value_block && s->here->e_value_size) { | |
673 | void *first_val = s->base + min_offs; | |
674 | size_t offs = le16_to_cpu(s->here->e_value_offs); | |
675 | void *val = s->base + offs; | |
617ba13b | 676 | size_t size = EXT4_XATTR_SIZE( |
ac27a0ec DK |
677 | le32_to_cpu(s->here->e_value_size)); |
678 | ||
617ba13b | 679 | if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { |
ac27a0ec DK |
680 | /* The old and the new value have the same |
681 | size. Just replace. */ | |
682 | s->here->e_value_size = | |
683 | cpu_to_le32(i->value_len); | |
bd9926e8 TT |
684 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
685 | memset(val, 0, size); | |
686 | } else { | |
687 | /* Clear pad bytes first. */ | |
688 | memset(val + size - EXT4_XATTR_PAD, 0, | |
689 | EXT4_XATTR_PAD); | |
690 | memcpy(val, i->value, i->value_len); | |
691 | } | |
ac27a0ec DK |
692 | return 0; |
693 | } | |
694 | ||
695 | /* Remove the old value. */ | |
696 | memmove(first_val + size, first_val, val - first_val); | |
697 | memset(first_val, 0, size); | |
698 | s->here->e_value_size = 0; | |
699 | s->here->e_value_offs = 0; | |
700 | min_offs += size; | |
701 | ||
702 | /* Adjust all value offsets. */ | |
703 | last = s->first; | |
704 | while (!IS_LAST_ENTRY(last)) { | |
705 | size_t o = le16_to_cpu(last->e_value_offs); | |
706 | if (!last->e_value_block && | |
707 | last->e_value_size && o < offs) | |
708 | last->e_value_offs = | |
709 | cpu_to_le16(o + size); | |
617ba13b | 710 | last = EXT4_XATTR_NEXT(last); |
ac27a0ec DK |
711 | } |
712 | } | |
713 | if (!i->value) { | |
714 | /* Remove the old name. */ | |
617ba13b | 715 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
716 | last = ENTRY((void *)last - size); |
717 | memmove(s->here, (void *)s->here + size, | |
718 | (void *)last - (void *)s->here + sizeof(__u32)); | |
719 | memset(last, 0, size); | |
720 | } | |
721 | } | |
722 | ||
723 | if (i->value) { | |
724 | /* Insert the new value. */ | |
725 | s->here->e_value_size = cpu_to_le32(i->value_len); | |
726 | if (i->value_len) { | |
617ba13b | 727 | size_t size = EXT4_XATTR_SIZE(i->value_len); |
ac27a0ec DK |
728 | void *val = s->base + min_offs - size; |
729 | s->here->e_value_offs = cpu_to_le16(min_offs - size); | |
bd9926e8 TT |
730 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
731 | memset(val, 0, size); | |
732 | } else { | |
733 | /* Clear the pad bytes first. */ | |
734 | memset(val + size - EXT4_XATTR_PAD, 0, | |
735 | EXT4_XATTR_PAD); | |
736 | memcpy(val, i->value, i->value_len); | |
737 | } | |
ac27a0ec DK |
738 | } |
739 | } | |
740 | return 0; | |
741 | } | |
742 | ||
617ba13b MC |
743 | struct ext4_xattr_block_find { |
744 | struct ext4_xattr_search s; | |
ac27a0ec DK |
745 | struct buffer_head *bh; |
746 | }; | |
747 | ||
748 | static int | |
617ba13b MC |
749 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
750 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
751 | { |
752 | struct super_block *sb = inode->i_sb; | |
753 | int error; | |
754 | ||
755 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
756 | i->name_index, i->name, i->value, (long)i->value_len); | |
757 | ||
617ba13b | 758 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 759 | /* The inode already has an extended attribute block. */ |
617ba13b | 760 | bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
761 | error = -EIO; |
762 | if (!bs->bh) | |
763 | goto cleanup; | |
764 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", | |
765 | atomic_read(&(bs->bh->b_count)), | |
766 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
cc8e94fd | 767 | if (ext4_xattr_check_block(inode, bs->bh)) { |
24676da4 TT |
768 | EXT4_ERROR_INODE(inode, "bad block %llu", |
769 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 770 | error = -EFSCORRUPTED; |
ac27a0ec DK |
771 | goto cleanup; |
772 | } | |
773 | /* Find the named attribute. */ | |
774 | bs->s.base = BHDR(bs->bh); | |
775 | bs->s.first = BFIRST(bs->bh); | |
776 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
777 | bs->s.here = bs->s.first; | |
617ba13b | 778 | error = ext4_xattr_find_entry(&bs->s.here, i->name_index, |
ac27a0ec DK |
779 | i->name, bs->bh->b_size, 1); |
780 | if (error && error != -ENODATA) | |
781 | goto cleanup; | |
782 | bs->s.not_found = error; | |
783 | } | |
784 | error = 0; | |
785 | ||
786 | cleanup: | |
787 | return error; | |
788 | } | |
789 | ||
790 | static int | |
617ba13b MC |
791 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
792 | struct ext4_xattr_info *i, | |
793 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
794 | { |
795 | struct super_block *sb = inode->i_sb; | |
796 | struct buffer_head *new_bh = NULL; | |
617ba13b | 797 | struct ext4_xattr_search *s = &bs->s; |
7a2508e1 | 798 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 799 | int error = 0; |
7a2508e1 | 800 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec | 801 | |
617ba13b | 802 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec DK |
803 | |
804 | if (i->value && i->value_len > sb->s_blocksize) | |
805 | return -ENOSPC; | |
806 | if (s->base) { | |
5d601255 | 807 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
808 | error = ext4_journal_get_write_access(handle, bs->bh); |
809 | if (error) | |
810 | goto cleanup; | |
811 | lock_buffer(bs->bh); | |
812 | ||
ac27a0ec | 813 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
814 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
815 | ||
816 | /* | |
817 | * This must happen under buffer lock for | |
818 | * ext4_xattr_block_set() to reliably detect modified | |
819 | * block | |
820 | */ | |
7a2508e1 JK |
821 | mb_cache_entry_delete_block(ext4_mb_cache, hash, |
822 | bs->bh->b_blocknr); | |
ac27a0ec | 823 | ea_bdebug(bs->bh, "modifying in-place"); |
617ba13b | 824 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
825 | if (!error) { |
826 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 827 | ext4_xattr_rehash(header(s->base), |
ac27a0ec | 828 | s->here); |
9c191f70 M |
829 | ext4_xattr_cache_insert(ext4_mb_cache, |
830 | bs->bh); | |
ac27a0ec DK |
831 | } |
832 | unlock_buffer(bs->bh); | |
6a797d27 | 833 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
834 | goto bad_block; |
835 | if (!error) | |
cc8e94fd DW |
836 | error = ext4_handle_dirty_xattr_block(handle, |
837 | inode, | |
838 | bs->bh); | |
ac27a0ec DK |
839 | if (error) |
840 | goto cleanup; | |
841 | goto inserted; | |
842 | } else { | |
843 | int offset = (char *)s->here - bs->bh->b_data; | |
844 | ||
8a2bfdcb | 845 | unlock_buffer(bs->bh); |
ac27a0ec | 846 | ea_bdebug(bs->bh, "cloning"); |
216553c4 | 847 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
848 | error = -ENOMEM; |
849 | if (s->base == NULL) | |
850 | goto cleanup; | |
851 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
852 | s->first = ENTRY(header(s->base)+1); | |
853 | header(s->base)->h_refcount = cpu_to_le32(1); | |
854 | s->here = ENTRY(s->base + offset); | |
855 | s->end = s->base + bs->bh->b_size; | |
856 | } | |
857 | } else { | |
858 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 859 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
860 | /* assert(header == s->base) */ |
861 | error = -ENOMEM; | |
862 | if (s->base == NULL) | |
863 | goto cleanup; | |
617ba13b | 864 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
865 | header(s->base)->h_blocks = cpu_to_le32(1); |
866 | header(s->base)->h_refcount = cpu_to_le32(1); | |
867 | s->first = ENTRY(header(s->base)+1); | |
868 | s->here = ENTRY(header(s->base)+1); | |
869 | s->end = s->base + sb->s_blocksize; | |
870 | } | |
871 | ||
617ba13b | 872 | error = ext4_xattr_set_entry(i, s); |
6a797d27 | 873 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
874 | goto bad_block; |
875 | if (error) | |
876 | goto cleanup; | |
877 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 878 | ext4_xattr_rehash(header(s->base), s->here); |
ac27a0ec DK |
879 | |
880 | inserted: | |
881 | if (!IS_LAST_ENTRY(s->first)) { | |
617ba13b | 882 | new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); |
ac27a0ec DK |
883 | if (new_bh) { |
884 | /* We found an identical block in the cache. */ | |
885 | if (new_bh == bs->bh) | |
886 | ea_bdebug(new_bh, "keeping"); | |
887 | else { | |
6048c64b AG |
888 | u32 ref; |
889 | ||
ac27a0ec DK |
890 | /* The old block is released after updating |
891 | the inode. */ | |
1231b3a1 LC |
892 | error = dquot_alloc_block(inode, |
893 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 894 | if (error) |
ac27a0ec | 895 | goto cleanup; |
5d601255 | 896 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 897 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
898 | new_bh); |
899 | if (error) | |
900 | goto cleanup_dquot; | |
901 | lock_buffer(new_bh); | |
82939d79 JK |
902 | /* |
903 | * We have to be careful about races with | |
6048c64b AG |
904 | * freeing, rehashing or adding references to |
905 | * xattr block. Once we hold buffer lock xattr | |
906 | * block's state is stable so we can check | |
907 | * whether the block got freed / rehashed or | |
908 | * not. Since we unhash mbcache entry under | |
909 | * buffer lock when freeing / rehashing xattr | |
910 | * block, checking whether entry is still | |
911 | * hashed is reliable. Same rules hold for | |
912 | * e_reusable handling. | |
82939d79 | 913 | */ |
6048c64b AG |
914 | if (hlist_bl_unhashed(&ce->e_hash_list) || |
915 | !ce->e_reusable) { | |
82939d79 JK |
916 | /* |
917 | * Undo everything and check mbcache | |
918 | * again. | |
919 | */ | |
920 | unlock_buffer(new_bh); | |
921 | dquot_free_block(inode, | |
922 | EXT4_C2B(EXT4_SB(sb), | |
923 | 1)); | |
924 | brelse(new_bh); | |
7a2508e1 | 925 | mb_cache_entry_put(ext4_mb_cache, ce); |
82939d79 JK |
926 | ce = NULL; |
927 | new_bh = NULL; | |
928 | goto inserted; | |
929 | } | |
6048c64b AG |
930 | ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
931 | BHDR(new_bh)->h_refcount = cpu_to_le32(ref); | |
932 | if (ref >= EXT4_XATTR_REFCOUNT_MAX) | |
933 | ce->e_reusable = 0; | |
ac27a0ec | 934 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
6048c64b | 935 | ref); |
ac27a0ec | 936 | unlock_buffer(new_bh); |
cc8e94fd DW |
937 | error = ext4_handle_dirty_xattr_block(handle, |
938 | inode, | |
939 | new_bh); | |
ac27a0ec DK |
940 | if (error) |
941 | goto cleanup_dquot; | |
942 | } | |
7a2508e1 JK |
943 | mb_cache_entry_touch(ext4_mb_cache, ce); |
944 | mb_cache_entry_put(ext4_mb_cache, ce); | |
ac27a0ec DK |
945 | ce = NULL; |
946 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
947 | /* We were modifying this block in-place. */ | |
948 | ea_bdebug(bs->bh, "keeping this block"); | |
949 | new_bh = bs->bh; | |
950 | get_bh(new_bh); | |
951 | } else { | |
952 | /* We need to allocate a new block */ | |
fb0a387d ES |
953 | ext4_fsblk_t goal, block; |
954 | ||
955 | goal = ext4_group_first_block_no(sb, | |
d00a6d7b | 956 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
957 | |
958 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 959 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
960 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
961 | ||
55f020db AH |
962 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
963 | NULL, &error); | |
ac27a0ec DK |
964 | if (error) |
965 | goto cleanup; | |
fb0a387d | 966 | |
12e9b892 | 967 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
968 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
969 | ||
ace36ad4 JP |
970 | ea_idebug(inode, "creating block %llu", |
971 | (unsigned long long)block); | |
ac27a0ec DK |
972 | |
973 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 974 | if (unlikely(!new_bh)) { |
860d21e2 | 975 | error = -ENOMEM; |
ac27a0ec | 976 | getblk_failed: |
7dc57615 | 977 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 978 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
979 | goto cleanup; |
980 | } | |
981 | lock_buffer(new_bh); | |
617ba13b | 982 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
983 | if (error) { |
984 | unlock_buffer(new_bh); | |
860d21e2 | 985 | error = -EIO; |
ac27a0ec DK |
986 | goto getblk_failed; |
987 | } | |
988 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
989 | set_buffer_uptodate(new_bh); | |
990 | unlock_buffer(new_bh); | |
9c191f70 | 991 | ext4_xattr_cache_insert(ext4_mb_cache, new_bh); |
cc8e94fd DW |
992 | error = ext4_handle_dirty_xattr_block(handle, |
993 | inode, new_bh); | |
ac27a0ec DK |
994 | if (error) |
995 | goto cleanup; | |
996 | } | |
997 | } | |
998 | ||
999 | /* Update the inode. */ | |
617ba13b | 1000 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
1001 | |
1002 | /* Drop the previous xattr block. */ | |
1003 | if (bs->bh && bs->bh != new_bh) | |
617ba13b | 1004 | ext4_xattr_release_block(handle, inode, bs->bh); |
ac27a0ec DK |
1005 | error = 0; |
1006 | ||
1007 | cleanup: | |
1008 | if (ce) | |
7a2508e1 | 1009 | mb_cache_entry_put(ext4_mb_cache, ce); |
ac27a0ec DK |
1010 | brelse(new_bh); |
1011 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
1012 | kfree(s->base); | |
1013 | ||
1014 | return error; | |
1015 | ||
1016 | cleanup_dquot: | |
1231b3a1 | 1017 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
1018 | goto cleanup; |
1019 | ||
1020 | bad_block: | |
24676da4 TT |
1021 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1022 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1023 | goto cleanup; |
1024 | ||
1025 | #undef header | |
1026 | } | |
1027 | ||
879b3825 TM |
1028 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
1029 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 1030 | { |
617ba13b MC |
1031 | struct ext4_xattr_ibody_header *header; |
1032 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
1033 | int error; |
1034 | ||
617ba13b | 1035 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1036 | return 0; |
617ba13b | 1037 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
1038 | header = IHDR(inode, raw_inode); |
1039 | is->s.base = is->s.first = IFIRST(header); | |
1040 | is->s.here = is->s.first; | |
617ba13b | 1041 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 1042 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
a0626e75 DW |
1043 | error = ext4_xattr_check_names(IFIRST(header), is->s.end, |
1044 | IFIRST(header)); | |
ac27a0ec DK |
1045 | if (error) |
1046 | return error; | |
1047 | /* Find the named attribute. */ | |
617ba13b | 1048 | error = ext4_xattr_find_entry(&is->s.here, i->name_index, |
ac27a0ec DK |
1049 | i->name, is->s.end - |
1050 | (void *)is->s.base, 0); | |
1051 | if (error && error != -ENODATA) | |
1052 | return error; | |
1053 | is->s.not_found = error; | |
1054 | } | |
1055 | return 0; | |
1056 | } | |
1057 | ||
0d812f77 TM |
1058 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
1059 | struct ext4_xattr_info *i, | |
1060 | struct ext4_xattr_ibody_find *is) | |
1061 | { | |
1062 | struct ext4_xattr_ibody_header *header; | |
1063 | struct ext4_xattr_search *s = &is->s; | |
1064 | int error; | |
1065 | ||
1066 | if (EXT4_I(inode)->i_extra_isize == 0) | |
1067 | return -ENOSPC; | |
1068 | error = ext4_xattr_set_entry(i, s); | |
1069 | if (error) { | |
1070 | if (error == -ENOSPC && | |
1071 | ext4_has_inline_data(inode)) { | |
1072 | error = ext4_try_to_evict_inline_data(handle, inode, | |
1073 | EXT4_XATTR_LEN(strlen(i->name) + | |
1074 | EXT4_XATTR_SIZE(i->value_len))); | |
1075 | if (error) | |
1076 | return error; | |
1077 | error = ext4_xattr_ibody_find(inode, i, is); | |
1078 | if (error) | |
1079 | return error; | |
1080 | error = ext4_xattr_set_entry(i, s); | |
1081 | } | |
1082 | if (error) | |
1083 | return error; | |
1084 | } | |
1085 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); | |
1086 | if (!IS_LAST_ENTRY(s->first)) { | |
1087 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
1088 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
1089 | } else { | |
1090 | header->h_magic = cpu_to_le32(0); | |
1091 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
1092 | } | |
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, | |
1097 | struct ext4_xattr_info *i, | |
1098 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 1099 | { |
617ba13b MC |
1100 | struct ext4_xattr_ibody_header *header; |
1101 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
1102 | int error; |
1103 | ||
617ba13b | 1104 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1105 | return -ENOSPC; |
617ba13b | 1106 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
1107 | if (error) |
1108 | return error; | |
617ba13b | 1109 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 1110 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 1111 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 1112 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1113 | } else { |
1114 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 1115 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1116 | } |
1117 | return 0; | |
1118 | } | |
1119 | ||
3fd16462 JK |
1120 | static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
1121 | struct ext4_xattr_info *i) | |
1122 | { | |
1123 | void *value; | |
1124 | ||
1125 | if (le32_to_cpu(s->here->e_value_size) != i->value_len) | |
1126 | return 0; | |
1127 | value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); | |
1128 | return !memcmp(value, i->value, i->value_len); | |
1129 | } | |
1130 | ||
ac27a0ec | 1131 | /* |
617ba13b | 1132 | * ext4_xattr_set_handle() |
ac27a0ec | 1133 | * |
6e9510b0 | 1134 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
1135 | * is NULL to remove an existing extended attribute, and non-NULL to |
1136 | * either replace an existing extended attribute, or create a new extended | |
1137 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
1138 | * specify that an extended attribute must exist and must not exist | |
1139 | * previous to the call, respectively. | |
1140 | * | |
1141 | * Returns 0, or a negative error number on failure. | |
1142 | */ | |
1143 | int | |
617ba13b | 1144 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
1145 | const char *name, const void *value, size_t value_len, |
1146 | int flags) | |
1147 | { | |
617ba13b | 1148 | struct ext4_xattr_info i = { |
ac27a0ec DK |
1149 | .name_index = name_index, |
1150 | .name = name, | |
1151 | .value = value, | |
1152 | .value_len = value_len, | |
1153 | ||
1154 | }; | |
617ba13b | 1155 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
1156 | .s = { .not_found = -ENODATA, }, |
1157 | }; | |
617ba13b | 1158 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
1159 | .s = { .not_found = -ENODATA, }, |
1160 | }; | |
4d20c685 | 1161 | unsigned long no_expand; |
ac27a0ec DK |
1162 | int error; |
1163 | ||
1164 | if (!name) | |
1165 | return -EINVAL; | |
1166 | if (strlen(name) > 255) | |
1167 | return -ERANGE; | |
617ba13b | 1168 | down_write(&EXT4_I(inode)->xattr_sem); |
19f5fb7a TT |
1169 | no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); |
1170 | ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); | |
4d20c685 | 1171 | |
66543617 | 1172 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
1173 | if (error) |
1174 | goto cleanup; | |
1175 | ||
19f5fb7a | 1176 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
1177 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
1178 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 1179 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
1180 | } |
1181 | ||
617ba13b | 1182 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
1183 | if (error) |
1184 | goto cleanup; | |
1185 | if (is.s.not_found) | |
617ba13b | 1186 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
1187 | if (error) |
1188 | goto cleanup; | |
1189 | if (is.s.not_found && bs.s.not_found) { | |
1190 | error = -ENODATA; | |
1191 | if (flags & XATTR_REPLACE) | |
1192 | goto cleanup; | |
1193 | error = 0; | |
1194 | if (!value) | |
1195 | goto cleanup; | |
1196 | } else { | |
1197 | error = -EEXIST; | |
1198 | if (flags & XATTR_CREATE) | |
1199 | goto cleanup; | |
1200 | } | |
ac27a0ec DK |
1201 | if (!value) { |
1202 | if (!is.s.not_found) | |
617ba13b | 1203 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 1204 | else if (!bs.s.not_found) |
617ba13b | 1205 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1206 | } else { |
3fd16462 JK |
1207 | error = 0; |
1208 | /* Xattr value did not change? Save us some work and bail out */ | |
1209 | if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) | |
1210 | goto cleanup; | |
1211 | if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) | |
1212 | goto cleanup; | |
1213 | ||
617ba13b | 1214 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
1215 | if (!error && !bs.s.not_found) { |
1216 | i.value = NULL; | |
617ba13b | 1217 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1218 | } else if (error == -ENOSPC) { |
7e01c8e5 TY |
1219 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
1220 | error = ext4_xattr_block_find(inode, &i, &bs); | |
1221 | if (error) | |
1222 | goto cleanup; | |
1223 | } | |
617ba13b | 1224 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec DK |
1225 | if (error) |
1226 | goto cleanup; | |
1227 | if (!is.s.not_found) { | |
1228 | i.value = NULL; | |
617ba13b | 1229 | error = ext4_xattr_ibody_set(handle, inode, &i, |
ac27a0ec DK |
1230 | &is); |
1231 | } | |
1232 | } | |
1233 | } | |
1234 | if (!error) { | |
617ba13b | 1235 | ext4_xattr_update_super_block(handle, inode->i_sb); |
ef7f3835 | 1236 | inode->i_ctime = ext4_current_time(inode); |
6dd4ee7c | 1237 | if (!value) |
19f5fb7a | 1238 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
617ba13b | 1239 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 1240 | /* |
617ba13b | 1241 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
1242 | * error != 0. |
1243 | */ | |
1244 | is.iloc.bh = NULL; | |
1245 | if (IS_SYNC(inode)) | |
0390131b | 1246 | ext4_handle_sync(handle); |
ac27a0ec DK |
1247 | } |
1248 | ||
1249 | cleanup: | |
1250 | brelse(is.iloc.bh); | |
1251 | brelse(bs.bh); | |
4d20c685 | 1252 | if (no_expand == 0) |
19f5fb7a | 1253 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
617ba13b | 1254 | up_write(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
1255 | return error; |
1256 | } | |
1257 | ||
1258 | /* | |
617ba13b | 1259 | * ext4_xattr_set() |
ac27a0ec | 1260 | * |
617ba13b | 1261 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
1262 | * attribute modification is a filesystem transaction by itself. |
1263 | * | |
1264 | * Returns 0, or a negative error number on failure. | |
1265 | */ | |
1266 | int | |
617ba13b | 1267 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
1268 | const void *value, size_t value_len, int flags) |
1269 | { | |
1270 | handle_t *handle; | |
1271 | int error, retries = 0; | |
95eaefbd | 1272 | int credits = ext4_jbd2_credits_xattr(inode); |
ac27a0ec DK |
1273 | |
1274 | retry: | |
9924a92a | 1275 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
1276 | if (IS_ERR(handle)) { |
1277 | error = PTR_ERR(handle); | |
1278 | } else { | |
1279 | int error2; | |
1280 | ||
617ba13b | 1281 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 1282 | value, value_len, flags); |
617ba13b | 1283 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 1284 | if (error == -ENOSPC && |
617ba13b | 1285 | ext4_should_retry_alloc(inode->i_sb, &retries)) |
ac27a0ec DK |
1286 | goto retry; |
1287 | if (error == 0) | |
1288 | error = error2; | |
1289 | } | |
1290 | ||
1291 | return error; | |
1292 | } | |
1293 | ||
6dd4ee7c KS |
1294 | /* |
1295 | * Shift the EA entries in the inode to create space for the increased | |
1296 | * i_extra_isize. | |
1297 | */ | |
1298 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
1299 | int value_offs_shift, void *to, | |
1300 | void *from, size_t n, int blocksize) | |
1301 | { | |
1302 | struct ext4_xattr_entry *last = entry; | |
1303 | int new_offs; | |
1304 | ||
1305 | /* Adjust the value offsets of the entries */ | |
1306 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1307 | if (!last->e_value_block && last->e_value_size) { | |
1308 | new_offs = le16_to_cpu(last->e_value_offs) + | |
1309 | value_offs_shift; | |
1310 | BUG_ON(new_offs + le32_to_cpu(last->e_value_size) | |
1311 | > blocksize); | |
1312 | last->e_value_offs = cpu_to_le16(new_offs); | |
1313 | } | |
1314 | } | |
1315 | /* Shift the entries by n bytes */ | |
1316 | memmove(to, from, n); | |
1317 | } | |
1318 | ||
1319 | /* | |
1320 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
1321 | * Returns 0 on success or negative error number on failure. | |
1322 | */ | |
1323 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
1324 | struct ext4_inode *raw_inode, handle_t *handle) | |
1325 | { | |
1326 | struct ext4_xattr_ibody_header *header; | |
1327 | struct ext4_xattr_entry *entry, *last, *first; | |
1328 | struct buffer_head *bh = NULL; | |
1329 | struct ext4_xattr_ibody_find *is = NULL; | |
1330 | struct ext4_xattr_block_find *bs = NULL; | |
1331 | char *buffer = NULL, *b_entry_name = NULL; | |
1332 | size_t min_offs, free; | |
7b1b2c1b | 1333 | int total_ino; |
6dd4ee7c KS |
1334 | void *base, *start, *end; |
1335 | int extra_isize = 0, error = 0, tried_min_extra_isize = 0; | |
ac39849d | 1336 | int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); |
6dd4ee7c KS |
1337 | |
1338 | down_write(&EXT4_I(inode)->xattr_sem); | |
1339 | retry: | |
1340 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { | |
1341 | up_write(&EXT4_I(inode)->xattr_sem); | |
1342 | return 0; | |
1343 | } | |
1344 | ||
1345 | header = IHDR(inode, raw_inode); | |
1346 | entry = IFIRST(header); | |
1347 | ||
1348 | /* | |
1349 | * Check if enough free space is available in the inode to shift the | |
1350 | * entries ahead by new_extra_isize. | |
1351 | */ | |
1352 | ||
1353 | base = start = entry; | |
1354 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
1355 | min_offs = end - base; | |
1356 | last = entry; | |
1357 | total_ino = sizeof(struct ext4_xattr_ibody_header); | |
1358 | ||
1359 | free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); | |
1360 | if (free >= new_extra_isize) { | |
1361 | entry = IFIRST(header); | |
1362 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize | |
1363 | - new_extra_isize, (void *)raw_inode + | |
1364 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
1365 | (void *)header, total_ino, | |
1366 | inode->i_sb->s_blocksize); | |
1367 | EXT4_I(inode)->i_extra_isize = new_extra_isize; | |
1368 | error = 0; | |
1369 | goto cleanup; | |
1370 | } | |
1371 | ||
1372 | /* | |
1373 | * Enough free space isn't available in the inode, check if | |
1374 | * EA block can hold new_extra_isize bytes. | |
1375 | */ | |
1376 | if (EXT4_I(inode)->i_file_acl) { | |
1377 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
1378 | error = -EIO; | |
1379 | if (!bh) | |
1380 | goto cleanup; | |
cc8e94fd | 1381 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
1382 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1383 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 1384 | error = -EFSCORRUPTED; |
6dd4ee7c KS |
1385 | goto cleanup; |
1386 | } | |
1387 | base = BHDR(bh); | |
1388 | first = BFIRST(bh); | |
1389 | end = bh->b_data + bh->b_size; | |
1390 | min_offs = end - base; | |
7b1b2c1b | 1391 | free = ext4_xattr_free_space(first, &min_offs, base, NULL); |
6dd4ee7c KS |
1392 | if (free < new_extra_isize) { |
1393 | if (!tried_min_extra_isize && s_min_extra_isize) { | |
1394 | tried_min_extra_isize++; | |
1395 | new_extra_isize = s_min_extra_isize; | |
1396 | brelse(bh); | |
1397 | goto retry; | |
1398 | } | |
1399 | error = -1; | |
1400 | goto cleanup; | |
1401 | } | |
1402 | } else { | |
1403 | free = inode->i_sb->s_blocksize; | |
1404 | } | |
1405 | ||
1406 | while (new_extra_isize > 0) { | |
1407 | size_t offs, size, entry_size; | |
1408 | struct ext4_xattr_entry *small_entry = NULL; | |
1409 | struct ext4_xattr_info i = { | |
1410 | .value = NULL, | |
1411 | .value_len = 0, | |
1412 | }; | |
1413 | unsigned int total_size; /* EA entry size + value size */ | |
1414 | unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ | |
1415 | unsigned int min_total_size = ~0U; | |
1416 | ||
1417 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); | |
1418 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
1419 | if (!is || !bs) { | |
1420 | error = -ENOMEM; | |
1421 | goto cleanup; | |
1422 | } | |
1423 | ||
1424 | is->s.not_found = -ENODATA; | |
1425 | bs->s.not_found = -ENODATA; | |
1426 | is->iloc.bh = NULL; | |
1427 | bs->bh = NULL; | |
1428 | ||
1429 | last = IFIRST(header); | |
1430 | /* Find the entry best suited to be pushed into EA block */ | |
1431 | entry = NULL; | |
1432 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1433 | total_size = | |
1434 | EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + | |
1435 | EXT4_XATTR_LEN(last->e_name_len); | |
1436 | if (total_size <= free && total_size < min_total_size) { | |
1437 | if (total_size < new_extra_isize) { | |
1438 | small_entry = last; | |
1439 | } else { | |
1440 | entry = last; | |
1441 | min_total_size = total_size; | |
1442 | } | |
1443 | } | |
1444 | } | |
1445 | ||
1446 | if (entry == NULL) { | |
1447 | if (small_entry) { | |
1448 | entry = small_entry; | |
1449 | } else { | |
1450 | if (!tried_min_extra_isize && | |
1451 | s_min_extra_isize) { | |
1452 | tried_min_extra_isize++; | |
1453 | new_extra_isize = s_min_extra_isize; | |
6e4ea8e3 DJ |
1454 | kfree(is); is = NULL; |
1455 | kfree(bs); bs = NULL; | |
dcb9917b | 1456 | brelse(bh); |
6dd4ee7c KS |
1457 | goto retry; |
1458 | } | |
1459 | error = -1; | |
1460 | goto cleanup; | |
1461 | } | |
1462 | } | |
1463 | offs = le16_to_cpu(entry->e_value_offs); | |
1464 | size = le32_to_cpu(entry->e_value_size); | |
1465 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
1466 | i.name_index = entry->e_name_index, | |
1467 | buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); | |
1468 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
1469 | if (!buffer || !b_entry_name) { | |
1470 | error = -ENOMEM; | |
1471 | goto cleanup; | |
1472 | } | |
1473 | /* Save the entry name and the entry value */ | |
1474 | memcpy(buffer, (void *)IFIRST(header) + offs, | |
1475 | EXT4_XATTR_SIZE(size)); | |
1476 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); | |
1477 | b_entry_name[entry->e_name_len] = '\0'; | |
1478 | i.name = b_entry_name; | |
1479 | ||
1480 | error = ext4_get_inode_loc(inode, &is->iloc); | |
1481 | if (error) | |
1482 | goto cleanup; | |
1483 | ||
1484 | error = ext4_xattr_ibody_find(inode, &i, is); | |
1485 | if (error) | |
1486 | goto cleanup; | |
1487 | ||
1488 | /* Remove the chosen entry from the inode */ | |
1489 | error = ext4_xattr_ibody_set(handle, inode, &i, is); | |
9aaab058 RK |
1490 | if (error) |
1491 | goto cleanup; | |
6dd4ee7c KS |
1492 | |
1493 | entry = IFIRST(header); | |
1494 | if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) | |
1495 | shift_bytes = new_extra_isize; | |
1496 | else | |
1497 | shift_bytes = entry_size + size; | |
1498 | /* Adjust the offsets and shift the remaining entries ahead */ | |
1499 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - | |
1500 | shift_bytes, (void *)raw_inode + | |
1501 | EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, | |
1502 | (void *)header, total_ino - entry_size, | |
1503 | inode->i_sb->s_blocksize); | |
1504 | ||
1505 | extra_isize += shift_bytes; | |
1506 | new_extra_isize -= shift_bytes; | |
1507 | EXT4_I(inode)->i_extra_isize = extra_isize; | |
1508 | ||
1509 | i.name = b_entry_name; | |
1510 | i.value = buffer; | |
ac39849d | 1511 | i.value_len = size; |
6dd4ee7c KS |
1512 | error = ext4_xattr_block_find(inode, &i, bs); |
1513 | if (error) | |
1514 | goto cleanup; | |
1515 | ||
1516 | /* Add entry which was removed from the inode into the block */ | |
1517 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
1518 | if (error) | |
1519 | goto cleanup; | |
1520 | kfree(b_entry_name); | |
1521 | kfree(buffer); | |
d3533d72 JL |
1522 | b_entry_name = NULL; |
1523 | buffer = NULL; | |
6dd4ee7c KS |
1524 | brelse(is->iloc.bh); |
1525 | kfree(is); | |
1526 | kfree(bs); | |
1527 | } | |
1528 | brelse(bh); | |
1529 | up_write(&EXT4_I(inode)->xattr_sem); | |
1530 | return 0; | |
1531 | ||
1532 | cleanup: | |
1533 | kfree(b_entry_name); | |
1534 | kfree(buffer); | |
1535 | if (is) | |
1536 | brelse(is->iloc.bh); | |
1537 | kfree(is); | |
1538 | kfree(bs); | |
1539 | brelse(bh); | |
1540 | up_write(&EXT4_I(inode)->xattr_sem); | |
1541 | return error; | |
1542 | } | |
1543 | ||
1544 | ||
1545 | ||
ac27a0ec | 1546 | /* |
617ba13b | 1547 | * ext4_xattr_delete_inode() |
ac27a0ec DK |
1548 | * |
1549 | * Free extended attribute resources associated with this inode. This | |
1550 | * is called immediately before an inode is freed. We have exclusive | |
1551 | * access to the inode. | |
1552 | */ | |
1553 | void | |
617ba13b | 1554 | ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
1555 | { |
1556 | struct buffer_head *bh = NULL; | |
1557 | ||
617ba13b | 1558 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 1559 | goto cleanup; |
617ba13b | 1560 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec | 1561 | if (!bh) { |
24676da4 TT |
1562 | EXT4_ERROR_INODE(inode, "block %llu read error", |
1563 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1564 | goto cleanup; |
1565 | } | |
617ba13b | 1566 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 1567 | BHDR(bh)->h_blocks != cpu_to_le32(1)) { |
24676da4 TT |
1568 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1569 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1570 | goto cleanup; |
1571 | } | |
617ba13b MC |
1572 | ext4_xattr_release_block(handle, inode, bh); |
1573 | EXT4_I(inode)->i_file_acl = 0; | |
ac27a0ec DK |
1574 | |
1575 | cleanup: | |
1576 | brelse(bh); | |
1577 | } | |
1578 | ||
ac27a0ec | 1579 | /* |
617ba13b | 1580 | * ext4_xattr_cache_insert() |
ac27a0ec DK |
1581 | * |
1582 | * Create a new entry in the extended attribute cache, and insert | |
1583 | * it unless such an entry is already in the cache. | |
1584 | * | |
1585 | * Returns 0, or a negative error number on failure. | |
1586 | */ | |
1587 | static void | |
7a2508e1 | 1588 | ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) |
ac27a0ec | 1589 | { |
6048c64b AG |
1590 | struct ext4_xattr_header *header = BHDR(bh); |
1591 | __u32 hash = le32_to_cpu(header->h_hash); | |
1592 | int reusable = le32_to_cpu(header->h_refcount) < | |
1593 | EXT4_XATTR_REFCOUNT_MAX; | |
ac27a0ec DK |
1594 | int error; |
1595 | ||
7a2508e1 | 1596 | error = mb_cache_entry_create(ext4_mb_cache, GFP_NOFS, hash, |
6048c64b | 1597 | bh->b_blocknr, reusable); |
ac27a0ec | 1598 | if (error) { |
82939d79 | 1599 | if (error == -EBUSY) |
ac27a0ec | 1600 | ea_bdebug(bh, "already in cache"); |
82939d79 | 1601 | } else |
ac27a0ec | 1602 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
1603 | } |
1604 | ||
1605 | /* | |
617ba13b | 1606 | * ext4_xattr_cmp() |
ac27a0ec DK |
1607 | * |
1608 | * Compare two extended attribute blocks for equality. | |
1609 | * | |
1610 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
1611 | * a negative error number on errors. | |
1612 | */ | |
1613 | static int | |
617ba13b MC |
1614 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
1615 | struct ext4_xattr_header *header2) | |
ac27a0ec | 1616 | { |
617ba13b | 1617 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
1618 | |
1619 | entry1 = ENTRY(header1+1); | |
1620 | entry2 = ENTRY(header2+1); | |
1621 | while (!IS_LAST_ENTRY(entry1)) { | |
1622 | if (IS_LAST_ENTRY(entry2)) | |
1623 | return 1; | |
1624 | if (entry1->e_hash != entry2->e_hash || | |
1625 | entry1->e_name_index != entry2->e_name_index || | |
1626 | entry1->e_name_len != entry2->e_name_len || | |
1627 | entry1->e_value_size != entry2->e_value_size || | |
1628 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) | |
1629 | return 1; | |
1630 | if (entry1->e_value_block != 0 || entry2->e_value_block != 0) | |
6a797d27 | 1631 | return -EFSCORRUPTED; |
ac27a0ec DK |
1632 | if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), |
1633 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), | |
1634 | le32_to_cpu(entry1->e_value_size))) | |
1635 | return 1; | |
1636 | ||
617ba13b MC |
1637 | entry1 = EXT4_XATTR_NEXT(entry1); |
1638 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
1639 | } |
1640 | if (!IS_LAST_ENTRY(entry2)) | |
1641 | return 1; | |
1642 | return 0; | |
1643 | } | |
1644 | ||
1645 | /* | |
617ba13b | 1646 | * ext4_xattr_cache_find() |
ac27a0ec DK |
1647 | * |
1648 | * Find an identical extended attribute block. | |
1649 | * | |
1650 | * Returns a pointer to the block found, or NULL if such a block was | |
1651 | * not found or an error occurred. | |
1652 | */ | |
1653 | static struct buffer_head * | |
617ba13b | 1654 | ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, |
7a2508e1 | 1655 | struct mb_cache_entry **pce) |
ac27a0ec DK |
1656 | { |
1657 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 JK |
1658 | struct mb_cache_entry *ce; |
1659 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); | |
ac27a0ec DK |
1660 | |
1661 | if (!header->h_hash) | |
1662 | return NULL; /* never share */ | |
1663 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
7a2508e1 | 1664 | ce = mb_cache_entry_find_first(ext4_mb_cache, hash); |
ac27a0ec DK |
1665 | while (ce) { |
1666 | struct buffer_head *bh; | |
1667 | ||
ac27a0ec DK |
1668 | bh = sb_bread(inode->i_sb, ce->e_block); |
1669 | if (!bh) { | |
24676da4 TT |
1670 | EXT4_ERROR_INODE(inode, "block %lu read error", |
1671 | (unsigned long) ce->e_block); | |
617ba13b | 1672 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
ac27a0ec DK |
1673 | *pce = ce; |
1674 | return bh; | |
1675 | } | |
1676 | brelse(bh); | |
7a2508e1 | 1677 | ce = mb_cache_entry_find_next(ext4_mb_cache, ce); |
ac27a0ec DK |
1678 | } |
1679 | return NULL; | |
1680 | } | |
1681 | ||
1682 | #define NAME_HASH_SHIFT 5 | |
1683 | #define VALUE_HASH_SHIFT 16 | |
1684 | ||
1685 | /* | |
617ba13b | 1686 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
1687 | * |
1688 | * Compute the hash of an extended attribute. | |
1689 | */ | |
617ba13b MC |
1690 | static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, |
1691 | struct ext4_xattr_entry *entry) | |
ac27a0ec DK |
1692 | { |
1693 | __u32 hash = 0; | |
1694 | char *name = entry->e_name; | |
1695 | int n; | |
1696 | ||
2b2d6d01 | 1697 | for (n = 0; n < entry->e_name_len; n++) { |
ac27a0ec DK |
1698 | hash = (hash << NAME_HASH_SHIFT) ^ |
1699 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
1700 | *name++; | |
1701 | } | |
1702 | ||
1703 | if (entry->e_value_block == 0 && entry->e_value_size != 0) { | |
1704 | __le32 *value = (__le32 *)((char *)header + | |
1705 | le16_to_cpu(entry->e_value_offs)); | |
1706 | for (n = (le32_to_cpu(entry->e_value_size) + | |
617ba13b | 1707 | EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { |
ac27a0ec DK |
1708 | hash = (hash << VALUE_HASH_SHIFT) ^ |
1709 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
1710 | le32_to_cpu(*value++); | |
1711 | } | |
1712 | } | |
1713 | entry->e_hash = cpu_to_le32(hash); | |
1714 | } | |
1715 | ||
1716 | #undef NAME_HASH_SHIFT | |
1717 | #undef VALUE_HASH_SHIFT | |
1718 | ||
1719 | #define BLOCK_HASH_SHIFT 16 | |
1720 | ||
1721 | /* | |
617ba13b | 1722 | * ext4_xattr_rehash() |
ac27a0ec DK |
1723 | * |
1724 | * Re-compute the extended attribute hash value after an entry has changed. | |
1725 | */ | |
617ba13b MC |
1726 | static void ext4_xattr_rehash(struct ext4_xattr_header *header, |
1727 | struct ext4_xattr_entry *entry) | |
ac27a0ec | 1728 | { |
617ba13b | 1729 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
1730 | __u32 hash = 0; |
1731 | ||
617ba13b | 1732 | ext4_xattr_hash_entry(header, entry); |
ac27a0ec DK |
1733 | here = ENTRY(header+1); |
1734 | while (!IS_LAST_ENTRY(here)) { | |
1735 | if (!here->e_hash) { | |
1736 | /* Block is not shared if an entry's hash value == 0 */ | |
1737 | hash = 0; | |
1738 | break; | |
1739 | } | |
1740 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
1741 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
1742 | le32_to_cpu(here->e_hash); | |
617ba13b | 1743 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
1744 | } |
1745 | header->h_hash = cpu_to_le32(hash); | |
1746 | } | |
1747 | ||
1748 | #undef BLOCK_HASH_SHIFT | |
1749 | ||
9c191f70 M |
1750 | #define HASH_BUCKET_BITS 10 |
1751 | ||
7a2508e1 | 1752 | struct mb_cache * |
82939d79 | 1753 | ext4_xattr_create_cache(void) |
ac27a0ec | 1754 | { |
7a2508e1 | 1755 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
1756 | } |
1757 | ||
7a2508e1 | 1758 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 1759 | { |
9c191f70 | 1760 | if (cache) |
7a2508e1 | 1761 | mb_cache_destroy(cache); |
ac27a0ec | 1762 | } |
9c191f70 | 1763 |