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Commit | Line | Data |
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ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/xattr.c |
ac27a0ec DK |
3 | * |
4 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> | |
5 | * | |
6 | * Fix by Harrison Xing <harrison@mountainviewdata.com>. | |
617ba13b | 7 | * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>. |
ac27a0ec DK |
8 | * Extended attributes for symlinks and special files added per |
9 | * suggestion of Luka Renko <luka.renko@hermes.si>. | |
10 | * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, | |
11 | * Red Hat Inc. | |
12 | * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz | |
13 | * and Andreas Gruenbacher <agruen@suse.de>. | |
14 | */ | |
15 | ||
16 | /* | |
17 | * Extended attributes are stored directly in inodes (on file systems with | |
18 | * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl | |
19 | * field contains the block number if an inode uses an additional block. All | |
20 | * attributes must fit in the inode and one additional block. Blocks that | |
21 | * contain the identical set of attributes may be shared among several inodes. | |
22 | * Identical blocks are detected by keeping a cache of blocks that have | |
23 | * recently been accessed. | |
24 | * | |
25 | * The attributes in inodes and on blocks have a different header; the entries | |
26 | * are stored in the same format: | |
27 | * | |
28 | * +------------------+ | |
29 | * | header | | |
30 | * | entry 1 | | | |
31 | * | entry 2 | | growing downwards | |
32 | * | entry 3 | v | |
33 | * | four null bytes | | |
34 | * | . . . | | |
35 | * | value 1 | ^ | |
36 | * | value 3 | | growing upwards | |
37 | * | value 2 | | | |
38 | * +------------------+ | |
39 | * | |
40 | * The header is followed by multiple entry descriptors. In disk blocks, the | |
41 | * entry descriptors are kept sorted. In inodes, they are unsorted. The | |
42 | * attribute values are aligned to the end of the block in no specific order. | |
43 | * | |
44 | * Locking strategy | |
45 | * ---------------- | |
617ba13b | 46 | * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem. |
ac27a0ec DK |
47 | * EA blocks are only changed if they are exclusive to an inode, so |
48 | * holding xattr_sem also means that nothing but the EA block's reference | |
49 | * count can change. Multiple writers to the same block are synchronized | |
50 | * by the buffer lock. | |
51 | */ | |
52 | ||
53 | #include <linux/init.h> | |
54 | #include <linux/fs.h> | |
55 | #include <linux/slab.h> | |
7a2508e1 | 56 | #include <linux/mbcache.h> |
ac27a0ec | 57 | #include <linux/quotaops.h> |
3dcf5451 CH |
58 | #include "ext4_jbd2.h" |
59 | #include "ext4.h" | |
ac27a0ec DK |
60 | #include "xattr.h" |
61 | #include "acl.h" | |
62 | ||
617ba13b | 63 | #ifdef EXT4_XATTR_DEBUG |
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 | { | |
8a2bfdcb | 548 | int error = 0; |
ac27a0ec | 549 | |
5d601255 | 550 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
551 | error = ext4_journal_get_write_access(handle, bh); |
552 | if (error) | |
553 | goto out; | |
554 | ||
555 | lock_buffer(bh); | |
ac27a0ec | 556 | if (BHDR(bh)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
557 | __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); |
558 | ||
ac27a0ec | 559 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
560 | /* |
561 | * This must happen under buffer lock for | |
562 | * ext4_xattr_block_set() to reliably detect freed block | |
563 | */ | |
7a2508e1 JK |
564 | mb_cache_entry_delete_block(EXT4_GET_MB_CACHE(inode), hash, |
565 | bh->b_blocknr); | |
ac27a0ec | 566 | get_bh(bh); |
ec4cb1aa | 567 | unlock_buffer(bh); |
e6362609 TT |
568 | ext4_free_blocks(handle, inode, bh, 0, 1, |
569 | EXT4_FREE_BLOCKS_METADATA | | |
570 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 571 | } else { |
e8546d06 | 572 | le32_add_cpu(&BHDR(bh)->h_refcount, -1); |
ec4cb1aa JK |
573 | /* |
574 | * Beware of this ugliness: Releasing of xattr block references | |
575 | * from different inodes can race and so we have to protect | |
576 | * from a race where someone else frees the block (and releases | |
577 | * its journal_head) before we are done dirtying the buffer. In | |
578 | * nojournal mode this race is harmless and we actually cannot | |
579 | * call ext4_handle_dirty_xattr_block() with locked buffer as | |
580 | * that function can call sync_dirty_buffer() so for that case | |
581 | * we handle the dirtying after unlocking the buffer. | |
582 | */ | |
583 | if (ext4_handle_valid(handle)) | |
584 | error = ext4_handle_dirty_xattr_block(handle, inode, | |
585 | bh); | |
c1bb05a6 | 586 | unlock_buffer(bh); |
ec4cb1aa JK |
587 | if (!ext4_handle_valid(handle)) |
588 | error = ext4_handle_dirty_xattr_block(handle, inode, | |
589 | bh); | |
8a2bfdcb | 590 | if (IS_SYNC(inode)) |
0390131b | 591 | ext4_handle_sync(handle); |
1231b3a1 | 592 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
593 | ea_bdebug(bh, "refcount now=%d; releasing", |
594 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 595 | } |
8a2bfdcb MC |
596 | out: |
597 | ext4_std_error(inode->i_sb, error); | |
598 | return; | |
ac27a0ec DK |
599 | } |
600 | ||
6dd4ee7c KS |
601 | /* |
602 | * Find the available free space for EAs. This also returns the total number of | |
603 | * bytes used by EA entries. | |
604 | */ | |
605 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
606 | size_t *min_offs, void *base, int *total) | |
607 | { | |
608 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
6dd4ee7c KS |
609 | if (!last->e_value_block && last->e_value_size) { |
610 | size_t offs = le16_to_cpu(last->e_value_offs); | |
611 | if (offs < *min_offs) | |
612 | *min_offs = offs; | |
613 | } | |
7b1b2c1b TT |
614 | if (total) |
615 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
616 | } |
617 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
618 | } | |
619 | ||
ac27a0ec | 620 | static int |
617ba13b | 621 | ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) |
ac27a0ec | 622 | { |
617ba13b | 623 | struct ext4_xattr_entry *last; |
ac27a0ec DK |
624 | size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); |
625 | ||
626 | /* Compute min_offs and last. */ | |
627 | last = s->first; | |
617ba13b | 628 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
ac27a0ec DK |
629 | if (!last->e_value_block && last->e_value_size) { |
630 | size_t offs = le16_to_cpu(last->e_value_offs); | |
631 | if (offs < min_offs) | |
632 | min_offs = offs; | |
633 | } | |
634 | } | |
635 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); | |
636 | if (!s->not_found) { | |
637 | if (!s->here->e_value_block && s->here->e_value_size) { | |
638 | size_t size = le32_to_cpu(s->here->e_value_size); | |
617ba13b | 639 | free += EXT4_XATTR_SIZE(size); |
ac27a0ec | 640 | } |
617ba13b | 641 | free += EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
642 | } |
643 | if (i->value) { | |
5f80f62a | 644 | if (free < EXT4_XATTR_LEN(name_len) + |
617ba13b | 645 | EXT4_XATTR_SIZE(i->value_len)) |
ac27a0ec DK |
646 | return -ENOSPC; |
647 | } | |
648 | ||
649 | if (i->value && s->not_found) { | |
650 | /* Insert the new name. */ | |
617ba13b | 651 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
652 | size_t rest = (void *)last - (void *)s->here + sizeof(__u32); |
653 | memmove((void *)s->here + size, s->here, rest); | |
654 | memset(s->here, 0, size); | |
655 | s->here->e_name_index = i->name_index; | |
656 | s->here->e_name_len = name_len; | |
657 | memcpy(s->here->e_name, i->name, name_len); | |
658 | } else { | |
659 | if (!s->here->e_value_block && s->here->e_value_size) { | |
660 | void *first_val = s->base + min_offs; | |
661 | size_t offs = le16_to_cpu(s->here->e_value_offs); | |
662 | void *val = s->base + offs; | |
617ba13b | 663 | size_t size = EXT4_XATTR_SIZE( |
ac27a0ec DK |
664 | le32_to_cpu(s->here->e_value_size)); |
665 | ||
617ba13b | 666 | if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { |
ac27a0ec DK |
667 | /* The old and the new value have the same |
668 | size. Just replace. */ | |
669 | s->here->e_value_size = | |
670 | cpu_to_le32(i->value_len); | |
bd9926e8 TT |
671 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
672 | memset(val, 0, size); | |
673 | } else { | |
674 | /* Clear pad bytes first. */ | |
675 | memset(val + size - EXT4_XATTR_PAD, 0, | |
676 | EXT4_XATTR_PAD); | |
677 | memcpy(val, i->value, i->value_len); | |
678 | } | |
ac27a0ec DK |
679 | return 0; |
680 | } | |
681 | ||
682 | /* Remove the old value. */ | |
683 | memmove(first_val + size, first_val, val - first_val); | |
684 | memset(first_val, 0, size); | |
685 | s->here->e_value_size = 0; | |
686 | s->here->e_value_offs = 0; | |
687 | min_offs += size; | |
688 | ||
689 | /* Adjust all value offsets. */ | |
690 | last = s->first; | |
691 | while (!IS_LAST_ENTRY(last)) { | |
692 | size_t o = le16_to_cpu(last->e_value_offs); | |
693 | if (!last->e_value_block && | |
694 | last->e_value_size && o < offs) | |
695 | last->e_value_offs = | |
696 | cpu_to_le16(o + size); | |
617ba13b | 697 | last = EXT4_XATTR_NEXT(last); |
ac27a0ec DK |
698 | } |
699 | } | |
700 | if (!i->value) { | |
701 | /* Remove the old name. */ | |
617ba13b | 702 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
703 | last = ENTRY((void *)last - size); |
704 | memmove(s->here, (void *)s->here + size, | |
705 | (void *)last - (void *)s->here + sizeof(__u32)); | |
706 | memset(last, 0, size); | |
707 | } | |
708 | } | |
709 | ||
710 | if (i->value) { | |
711 | /* Insert the new value. */ | |
712 | s->here->e_value_size = cpu_to_le32(i->value_len); | |
713 | if (i->value_len) { | |
617ba13b | 714 | size_t size = EXT4_XATTR_SIZE(i->value_len); |
ac27a0ec DK |
715 | void *val = s->base + min_offs - size; |
716 | s->here->e_value_offs = cpu_to_le16(min_offs - size); | |
bd9926e8 TT |
717 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
718 | memset(val, 0, size); | |
719 | } else { | |
720 | /* Clear the pad bytes first. */ | |
721 | memset(val + size - EXT4_XATTR_PAD, 0, | |
722 | EXT4_XATTR_PAD); | |
723 | memcpy(val, i->value, i->value_len); | |
724 | } | |
ac27a0ec DK |
725 | } |
726 | } | |
727 | return 0; | |
728 | } | |
729 | ||
617ba13b MC |
730 | struct ext4_xattr_block_find { |
731 | struct ext4_xattr_search s; | |
ac27a0ec DK |
732 | struct buffer_head *bh; |
733 | }; | |
734 | ||
735 | static int | |
617ba13b MC |
736 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
737 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
738 | { |
739 | struct super_block *sb = inode->i_sb; | |
740 | int error; | |
741 | ||
742 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
743 | i->name_index, i->name, i->value, (long)i->value_len); | |
744 | ||
617ba13b | 745 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 746 | /* The inode already has an extended attribute block. */ |
617ba13b | 747 | bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
748 | error = -EIO; |
749 | if (!bs->bh) | |
750 | goto cleanup; | |
751 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", | |
752 | atomic_read(&(bs->bh->b_count)), | |
753 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
cc8e94fd | 754 | if (ext4_xattr_check_block(inode, bs->bh)) { |
24676da4 TT |
755 | EXT4_ERROR_INODE(inode, "bad block %llu", |
756 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 757 | error = -EFSCORRUPTED; |
ac27a0ec DK |
758 | goto cleanup; |
759 | } | |
760 | /* Find the named attribute. */ | |
761 | bs->s.base = BHDR(bs->bh); | |
762 | bs->s.first = BFIRST(bs->bh); | |
763 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
764 | bs->s.here = bs->s.first; | |
617ba13b | 765 | error = ext4_xattr_find_entry(&bs->s.here, i->name_index, |
ac27a0ec DK |
766 | i->name, bs->bh->b_size, 1); |
767 | if (error && error != -ENODATA) | |
768 | goto cleanup; | |
769 | bs->s.not_found = error; | |
770 | } | |
771 | error = 0; | |
772 | ||
773 | cleanup: | |
774 | return error; | |
775 | } | |
776 | ||
777 | static int | |
617ba13b MC |
778 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
779 | struct ext4_xattr_info *i, | |
780 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
781 | { |
782 | struct super_block *sb = inode->i_sb; | |
783 | struct buffer_head *new_bh = NULL; | |
617ba13b | 784 | struct ext4_xattr_search *s = &bs->s; |
7a2508e1 | 785 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 786 | int error = 0; |
7a2508e1 | 787 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec | 788 | |
617ba13b | 789 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec DK |
790 | |
791 | if (i->value && i->value_len > sb->s_blocksize) | |
792 | return -ENOSPC; | |
793 | if (s->base) { | |
5d601255 | 794 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
795 | error = ext4_journal_get_write_access(handle, bs->bh); |
796 | if (error) | |
797 | goto cleanup; | |
798 | lock_buffer(bs->bh); | |
799 | ||
ac27a0ec | 800 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
801 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
802 | ||
803 | /* | |
804 | * This must happen under buffer lock for | |
805 | * ext4_xattr_block_set() to reliably detect modified | |
806 | * block | |
807 | */ | |
7a2508e1 JK |
808 | mb_cache_entry_delete_block(ext4_mb_cache, hash, |
809 | bs->bh->b_blocknr); | |
ac27a0ec | 810 | ea_bdebug(bs->bh, "modifying in-place"); |
617ba13b | 811 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
812 | if (!error) { |
813 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 814 | ext4_xattr_rehash(header(s->base), |
ac27a0ec | 815 | s->here); |
9c191f70 M |
816 | ext4_xattr_cache_insert(ext4_mb_cache, |
817 | bs->bh); | |
ac27a0ec DK |
818 | } |
819 | unlock_buffer(bs->bh); | |
6a797d27 | 820 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
821 | goto bad_block; |
822 | if (!error) | |
cc8e94fd DW |
823 | error = ext4_handle_dirty_xattr_block(handle, |
824 | inode, | |
825 | bs->bh); | |
ac27a0ec DK |
826 | if (error) |
827 | goto cleanup; | |
828 | goto inserted; | |
829 | } else { | |
830 | int offset = (char *)s->here - bs->bh->b_data; | |
831 | ||
8a2bfdcb | 832 | unlock_buffer(bs->bh); |
ac27a0ec | 833 | ea_bdebug(bs->bh, "cloning"); |
216553c4 | 834 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
835 | error = -ENOMEM; |
836 | if (s->base == NULL) | |
837 | goto cleanup; | |
838 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
839 | s->first = ENTRY(header(s->base)+1); | |
840 | header(s->base)->h_refcount = cpu_to_le32(1); | |
841 | s->here = ENTRY(s->base + offset); | |
842 | s->end = s->base + bs->bh->b_size; | |
843 | } | |
844 | } else { | |
845 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 846 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
847 | /* assert(header == s->base) */ |
848 | error = -ENOMEM; | |
849 | if (s->base == NULL) | |
850 | goto cleanup; | |
617ba13b | 851 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
852 | header(s->base)->h_blocks = cpu_to_le32(1); |
853 | header(s->base)->h_refcount = cpu_to_le32(1); | |
854 | s->first = ENTRY(header(s->base)+1); | |
855 | s->here = ENTRY(header(s->base)+1); | |
856 | s->end = s->base + sb->s_blocksize; | |
857 | } | |
858 | ||
617ba13b | 859 | error = ext4_xattr_set_entry(i, s); |
6a797d27 | 860 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
861 | goto bad_block; |
862 | if (error) | |
863 | goto cleanup; | |
864 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 865 | ext4_xattr_rehash(header(s->base), s->here); |
ac27a0ec DK |
866 | |
867 | inserted: | |
868 | if (!IS_LAST_ENTRY(s->first)) { | |
617ba13b | 869 | new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); |
ac27a0ec DK |
870 | if (new_bh) { |
871 | /* We found an identical block in the cache. */ | |
872 | if (new_bh == bs->bh) | |
873 | ea_bdebug(new_bh, "keeping"); | |
874 | else { | |
875 | /* The old block is released after updating | |
876 | the inode. */ | |
1231b3a1 LC |
877 | error = dquot_alloc_block(inode, |
878 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 879 | if (error) |
ac27a0ec | 880 | goto cleanup; |
5d601255 | 881 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 882 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
883 | new_bh); |
884 | if (error) | |
885 | goto cleanup_dquot; | |
886 | lock_buffer(new_bh); | |
82939d79 JK |
887 | /* |
888 | * We have to be careful about races with | |
889 | * freeing or rehashing of xattr block. Once we | |
890 | * hold buffer lock xattr block's state is | |
891 | * stable so we can check whether the block got | |
892 | * freed / rehashed or not. Since we unhash | |
893 | * mbcache entry under buffer lock when freeing | |
894 | * / rehashing xattr block, checking whether | |
895 | * entry is still hashed is reliable. | |
896 | */ | |
897 | if (hlist_bl_unhashed(&ce->e_hash_list)) { | |
898 | /* | |
899 | * Undo everything and check mbcache | |
900 | * again. | |
901 | */ | |
902 | unlock_buffer(new_bh); | |
903 | dquot_free_block(inode, | |
904 | EXT4_C2B(EXT4_SB(sb), | |
905 | 1)); | |
906 | brelse(new_bh); | |
7a2508e1 | 907 | mb_cache_entry_put(ext4_mb_cache, ce); |
82939d79 JK |
908 | ce = NULL; |
909 | new_bh = NULL; | |
910 | goto inserted; | |
911 | } | |
e8546d06 | 912 | le32_add_cpu(&BHDR(new_bh)->h_refcount, 1); |
ac27a0ec DK |
913 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
914 | le32_to_cpu(BHDR(new_bh)->h_refcount)); | |
915 | unlock_buffer(new_bh); | |
cc8e94fd DW |
916 | error = ext4_handle_dirty_xattr_block(handle, |
917 | inode, | |
918 | new_bh); | |
ac27a0ec DK |
919 | if (error) |
920 | goto cleanup_dquot; | |
921 | } | |
7a2508e1 JK |
922 | mb_cache_entry_touch(ext4_mb_cache, ce); |
923 | mb_cache_entry_put(ext4_mb_cache, ce); | |
ac27a0ec DK |
924 | ce = NULL; |
925 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
926 | /* We were modifying this block in-place. */ | |
927 | ea_bdebug(bs->bh, "keeping this block"); | |
928 | new_bh = bs->bh; | |
929 | get_bh(new_bh); | |
930 | } else { | |
931 | /* We need to allocate a new block */ | |
fb0a387d ES |
932 | ext4_fsblk_t goal, block; |
933 | ||
934 | goal = ext4_group_first_block_no(sb, | |
d00a6d7b | 935 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
936 | |
937 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 938 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
939 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
940 | ||
55f020db AH |
941 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
942 | NULL, &error); | |
ac27a0ec DK |
943 | if (error) |
944 | goto cleanup; | |
fb0a387d | 945 | |
12e9b892 | 946 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
947 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
948 | ||
ace36ad4 JP |
949 | ea_idebug(inode, "creating block %llu", |
950 | (unsigned long long)block); | |
ac27a0ec DK |
951 | |
952 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 953 | if (unlikely(!new_bh)) { |
860d21e2 | 954 | error = -ENOMEM; |
ac27a0ec | 955 | getblk_failed: |
7dc57615 | 956 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 957 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
958 | goto cleanup; |
959 | } | |
960 | lock_buffer(new_bh); | |
617ba13b | 961 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
962 | if (error) { |
963 | unlock_buffer(new_bh); | |
860d21e2 | 964 | error = -EIO; |
ac27a0ec DK |
965 | goto getblk_failed; |
966 | } | |
967 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
968 | set_buffer_uptodate(new_bh); | |
969 | unlock_buffer(new_bh); | |
9c191f70 | 970 | ext4_xattr_cache_insert(ext4_mb_cache, new_bh); |
cc8e94fd DW |
971 | error = ext4_handle_dirty_xattr_block(handle, |
972 | inode, new_bh); | |
ac27a0ec DK |
973 | if (error) |
974 | goto cleanup; | |
975 | } | |
976 | } | |
977 | ||
978 | /* Update the inode. */ | |
617ba13b | 979 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
980 | |
981 | /* Drop the previous xattr block. */ | |
982 | if (bs->bh && bs->bh != new_bh) | |
617ba13b | 983 | ext4_xattr_release_block(handle, inode, bs->bh); |
ac27a0ec DK |
984 | error = 0; |
985 | ||
986 | cleanup: | |
987 | if (ce) | |
7a2508e1 | 988 | mb_cache_entry_put(ext4_mb_cache, ce); |
ac27a0ec DK |
989 | brelse(new_bh); |
990 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
991 | kfree(s->base); | |
992 | ||
993 | return error; | |
994 | ||
995 | cleanup_dquot: | |
1231b3a1 | 996 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
997 | goto cleanup; |
998 | ||
999 | bad_block: | |
24676da4 TT |
1000 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1001 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1002 | goto cleanup; |
1003 | ||
1004 | #undef header | |
1005 | } | |
1006 | ||
879b3825 TM |
1007 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
1008 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 1009 | { |
617ba13b MC |
1010 | struct ext4_xattr_ibody_header *header; |
1011 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
1012 | int error; |
1013 | ||
617ba13b | 1014 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1015 | return 0; |
617ba13b | 1016 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
1017 | header = IHDR(inode, raw_inode); |
1018 | is->s.base = is->s.first = IFIRST(header); | |
1019 | is->s.here = is->s.first; | |
617ba13b | 1020 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 1021 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
a0626e75 DW |
1022 | error = ext4_xattr_check_names(IFIRST(header), is->s.end, |
1023 | IFIRST(header)); | |
ac27a0ec DK |
1024 | if (error) |
1025 | return error; | |
1026 | /* Find the named attribute. */ | |
617ba13b | 1027 | error = ext4_xattr_find_entry(&is->s.here, i->name_index, |
ac27a0ec DK |
1028 | i->name, is->s.end - |
1029 | (void *)is->s.base, 0); | |
1030 | if (error && error != -ENODATA) | |
1031 | return error; | |
1032 | is->s.not_found = error; | |
1033 | } | |
1034 | return 0; | |
1035 | } | |
1036 | ||
0d812f77 TM |
1037 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
1038 | struct ext4_xattr_info *i, | |
1039 | struct ext4_xattr_ibody_find *is) | |
1040 | { | |
1041 | struct ext4_xattr_ibody_header *header; | |
1042 | struct ext4_xattr_search *s = &is->s; | |
1043 | int error; | |
1044 | ||
1045 | if (EXT4_I(inode)->i_extra_isize == 0) | |
1046 | return -ENOSPC; | |
1047 | error = ext4_xattr_set_entry(i, s); | |
1048 | if (error) { | |
1049 | if (error == -ENOSPC && | |
1050 | ext4_has_inline_data(inode)) { | |
1051 | error = ext4_try_to_evict_inline_data(handle, inode, | |
1052 | EXT4_XATTR_LEN(strlen(i->name) + | |
1053 | EXT4_XATTR_SIZE(i->value_len))); | |
1054 | if (error) | |
1055 | return error; | |
1056 | error = ext4_xattr_ibody_find(inode, i, is); | |
1057 | if (error) | |
1058 | return error; | |
1059 | error = ext4_xattr_set_entry(i, s); | |
1060 | } | |
1061 | if (error) | |
1062 | return error; | |
1063 | } | |
1064 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); | |
1065 | if (!IS_LAST_ENTRY(s->first)) { | |
1066 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
1067 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
1068 | } else { | |
1069 | header->h_magic = cpu_to_le32(0); | |
1070 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
1071 | } | |
1072 | return 0; | |
1073 | } | |
1074 | ||
1075 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, | |
1076 | struct ext4_xattr_info *i, | |
1077 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 1078 | { |
617ba13b MC |
1079 | struct ext4_xattr_ibody_header *header; |
1080 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
1081 | int error; |
1082 | ||
617ba13b | 1083 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1084 | return -ENOSPC; |
617ba13b | 1085 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
1086 | if (error) |
1087 | return error; | |
617ba13b | 1088 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 1089 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 1090 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 1091 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1092 | } else { |
1093 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 1094 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1095 | } |
1096 | return 0; | |
1097 | } | |
1098 | ||
1099 | /* | |
617ba13b | 1100 | * ext4_xattr_set_handle() |
ac27a0ec | 1101 | * |
6e9510b0 | 1102 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
1103 | * is NULL to remove an existing extended attribute, and non-NULL to |
1104 | * either replace an existing extended attribute, or create a new extended | |
1105 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
1106 | * specify that an extended attribute must exist and must not exist | |
1107 | * previous to the call, respectively. | |
1108 | * | |
1109 | * Returns 0, or a negative error number on failure. | |
1110 | */ | |
1111 | int | |
617ba13b | 1112 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
1113 | const char *name, const void *value, size_t value_len, |
1114 | int flags) | |
1115 | { | |
617ba13b | 1116 | struct ext4_xattr_info i = { |
ac27a0ec DK |
1117 | .name_index = name_index, |
1118 | .name = name, | |
1119 | .value = value, | |
1120 | .value_len = value_len, | |
1121 | ||
1122 | }; | |
617ba13b | 1123 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
1124 | .s = { .not_found = -ENODATA, }, |
1125 | }; | |
617ba13b | 1126 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
1127 | .s = { .not_found = -ENODATA, }, |
1128 | }; | |
4d20c685 | 1129 | unsigned long no_expand; |
ac27a0ec DK |
1130 | int error; |
1131 | ||
1132 | if (!name) | |
1133 | return -EINVAL; | |
1134 | if (strlen(name) > 255) | |
1135 | return -ERANGE; | |
617ba13b | 1136 | down_write(&EXT4_I(inode)->xattr_sem); |
19f5fb7a TT |
1137 | no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); |
1138 | ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); | |
4d20c685 | 1139 | |
66543617 | 1140 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
1141 | if (error) |
1142 | goto cleanup; | |
1143 | ||
19f5fb7a | 1144 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
1145 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
1146 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 1147 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
1148 | } |
1149 | ||
617ba13b | 1150 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
1151 | if (error) |
1152 | goto cleanup; | |
1153 | if (is.s.not_found) | |
617ba13b | 1154 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
1155 | if (error) |
1156 | goto cleanup; | |
1157 | if (is.s.not_found && bs.s.not_found) { | |
1158 | error = -ENODATA; | |
1159 | if (flags & XATTR_REPLACE) | |
1160 | goto cleanup; | |
1161 | error = 0; | |
1162 | if (!value) | |
1163 | goto cleanup; | |
1164 | } else { | |
1165 | error = -EEXIST; | |
1166 | if (flags & XATTR_CREATE) | |
1167 | goto cleanup; | |
1168 | } | |
ac27a0ec DK |
1169 | if (!value) { |
1170 | if (!is.s.not_found) | |
617ba13b | 1171 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 1172 | else if (!bs.s.not_found) |
617ba13b | 1173 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1174 | } else { |
617ba13b | 1175 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
1176 | if (!error && !bs.s.not_found) { |
1177 | i.value = NULL; | |
617ba13b | 1178 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1179 | } else if (error == -ENOSPC) { |
7e01c8e5 TY |
1180 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
1181 | error = ext4_xattr_block_find(inode, &i, &bs); | |
1182 | if (error) | |
1183 | goto cleanup; | |
1184 | } | |
617ba13b | 1185 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec DK |
1186 | if (error) |
1187 | goto cleanup; | |
1188 | if (!is.s.not_found) { | |
1189 | i.value = NULL; | |
617ba13b | 1190 | error = ext4_xattr_ibody_set(handle, inode, &i, |
ac27a0ec DK |
1191 | &is); |
1192 | } | |
1193 | } | |
1194 | } | |
1195 | if (!error) { | |
617ba13b | 1196 | ext4_xattr_update_super_block(handle, inode->i_sb); |
ef7f3835 | 1197 | inode->i_ctime = ext4_current_time(inode); |
6dd4ee7c | 1198 | if (!value) |
19f5fb7a | 1199 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
617ba13b | 1200 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 1201 | /* |
617ba13b | 1202 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
1203 | * error != 0. |
1204 | */ | |
1205 | is.iloc.bh = NULL; | |
1206 | if (IS_SYNC(inode)) | |
0390131b | 1207 | ext4_handle_sync(handle); |
ac27a0ec DK |
1208 | } |
1209 | ||
1210 | cleanup: | |
1211 | brelse(is.iloc.bh); | |
1212 | brelse(bs.bh); | |
4d20c685 | 1213 | if (no_expand == 0) |
19f5fb7a | 1214 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
617ba13b | 1215 | up_write(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
1216 | return error; |
1217 | } | |
1218 | ||
1219 | /* | |
617ba13b | 1220 | * ext4_xattr_set() |
ac27a0ec | 1221 | * |
617ba13b | 1222 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
1223 | * attribute modification is a filesystem transaction by itself. |
1224 | * | |
1225 | * Returns 0, or a negative error number on failure. | |
1226 | */ | |
1227 | int | |
617ba13b | 1228 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
1229 | const void *value, size_t value_len, int flags) |
1230 | { | |
1231 | handle_t *handle; | |
1232 | int error, retries = 0; | |
95eaefbd | 1233 | int credits = ext4_jbd2_credits_xattr(inode); |
ac27a0ec DK |
1234 | |
1235 | retry: | |
9924a92a | 1236 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
1237 | if (IS_ERR(handle)) { |
1238 | error = PTR_ERR(handle); | |
1239 | } else { | |
1240 | int error2; | |
1241 | ||
617ba13b | 1242 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 1243 | value, value_len, flags); |
617ba13b | 1244 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 1245 | if (error == -ENOSPC && |
617ba13b | 1246 | ext4_should_retry_alloc(inode->i_sb, &retries)) |
ac27a0ec DK |
1247 | goto retry; |
1248 | if (error == 0) | |
1249 | error = error2; | |
1250 | } | |
1251 | ||
1252 | return error; | |
1253 | } | |
1254 | ||
6dd4ee7c KS |
1255 | /* |
1256 | * Shift the EA entries in the inode to create space for the increased | |
1257 | * i_extra_isize. | |
1258 | */ | |
1259 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
1260 | int value_offs_shift, void *to, | |
1261 | void *from, size_t n, int blocksize) | |
1262 | { | |
1263 | struct ext4_xattr_entry *last = entry; | |
1264 | int new_offs; | |
1265 | ||
1266 | /* Adjust the value offsets of the entries */ | |
1267 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1268 | if (!last->e_value_block && last->e_value_size) { | |
1269 | new_offs = le16_to_cpu(last->e_value_offs) + | |
1270 | value_offs_shift; | |
1271 | BUG_ON(new_offs + le32_to_cpu(last->e_value_size) | |
1272 | > blocksize); | |
1273 | last->e_value_offs = cpu_to_le16(new_offs); | |
1274 | } | |
1275 | } | |
1276 | /* Shift the entries by n bytes */ | |
1277 | memmove(to, from, n); | |
1278 | } | |
1279 | ||
1280 | /* | |
1281 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
1282 | * Returns 0 on success or negative error number on failure. | |
1283 | */ | |
1284 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
1285 | struct ext4_inode *raw_inode, handle_t *handle) | |
1286 | { | |
1287 | struct ext4_xattr_ibody_header *header; | |
1288 | struct ext4_xattr_entry *entry, *last, *first; | |
1289 | struct buffer_head *bh = NULL; | |
1290 | struct ext4_xattr_ibody_find *is = NULL; | |
1291 | struct ext4_xattr_block_find *bs = NULL; | |
1292 | char *buffer = NULL, *b_entry_name = NULL; | |
1293 | size_t min_offs, free; | |
7b1b2c1b | 1294 | int total_ino; |
6dd4ee7c KS |
1295 | void *base, *start, *end; |
1296 | int extra_isize = 0, error = 0, tried_min_extra_isize = 0; | |
ac39849d | 1297 | int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); |
6dd4ee7c KS |
1298 | |
1299 | down_write(&EXT4_I(inode)->xattr_sem); | |
1300 | retry: | |
1301 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { | |
1302 | up_write(&EXT4_I(inode)->xattr_sem); | |
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | header = IHDR(inode, raw_inode); | |
1307 | entry = IFIRST(header); | |
1308 | ||
1309 | /* | |
1310 | * Check if enough free space is available in the inode to shift the | |
1311 | * entries ahead by new_extra_isize. | |
1312 | */ | |
1313 | ||
1314 | base = start = entry; | |
1315 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
1316 | min_offs = end - base; | |
1317 | last = entry; | |
1318 | total_ino = sizeof(struct ext4_xattr_ibody_header); | |
1319 | ||
1320 | free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); | |
1321 | if (free >= new_extra_isize) { | |
1322 | entry = IFIRST(header); | |
1323 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize | |
1324 | - new_extra_isize, (void *)raw_inode + | |
1325 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
1326 | (void *)header, total_ino, | |
1327 | inode->i_sb->s_blocksize); | |
1328 | EXT4_I(inode)->i_extra_isize = new_extra_isize; | |
1329 | error = 0; | |
1330 | goto cleanup; | |
1331 | } | |
1332 | ||
1333 | /* | |
1334 | * Enough free space isn't available in the inode, check if | |
1335 | * EA block can hold new_extra_isize bytes. | |
1336 | */ | |
1337 | if (EXT4_I(inode)->i_file_acl) { | |
1338 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
1339 | error = -EIO; | |
1340 | if (!bh) | |
1341 | goto cleanup; | |
cc8e94fd | 1342 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
1343 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1344 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 1345 | error = -EFSCORRUPTED; |
6dd4ee7c KS |
1346 | goto cleanup; |
1347 | } | |
1348 | base = BHDR(bh); | |
1349 | first = BFIRST(bh); | |
1350 | end = bh->b_data + bh->b_size; | |
1351 | min_offs = end - base; | |
7b1b2c1b | 1352 | free = ext4_xattr_free_space(first, &min_offs, base, NULL); |
6dd4ee7c KS |
1353 | if (free < new_extra_isize) { |
1354 | if (!tried_min_extra_isize && s_min_extra_isize) { | |
1355 | tried_min_extra_isize++; | |
1356 | new_extra_isize = s_min_extra_isize; | |
1357 | brelse(bh); | |
1358 | goto retry; | |
1359 | } | |
1360 | error = -1; | |
1361 | goto cleanup; | |
1362 | } | |
1363 | } else { | |
1364 | free = inode->i_sb->s_blocksize; | |
1365 | } | |
1366 | ||
1367 | while (new_extra_isize > 0) { | |
1368 | size_t offs, size, entry_size; | |
1369 | struct ext4_xattr_entry *small_entry = NULL; | |
1370 | struct ext4_xattr_info i = { | |
1371 | .value = NULL, | |
1372 | .value_len = 0, | |
1373 | }; | |
1374 | unsigned int total_size; /* EA entry size + value size */ | |
1375 | unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ | |
1376 | unsigned int min_total_size = ~0U; | |
1377 | ||
1378 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); | |
1379 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
1380 | if (!is || !bs) { | |
1381 | error = -ENOMEM; | |
1382 | goto cleanup; | |
1383 | } | |
1384 | ||
1385 | is->s.not_found = -ENODATA; | |
1386 | bs->s.not_found = -ENODATA; | |
1387 | is->iloc.bh = NULL; | |
1388 | bs->bh = NULL; | |
1389 | ||
1390 | last = IFIRST(header); | |
1391 | /* Find the entry best suited to be pushed into EA block */ | |
1392 | entry = NULL; | |
1393 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1394 | total_size = | |
1395 | EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + | |
1396 | EXT4_XATTR_LEN(last->e_name_len); | |
1397 | if (total_size <= free && total_size < min_total_size) { | |
1398 | if (total_size < new_extra_isize) { | |
1399 | small_entry = last; | |
1400 | } else { | |
1401 | entry = last; | |
1402 | min_total_size = total_size; | |
1403 | } | |
1404 | } | |
1405 | } | |
1406 | ||
1407 | if (entry == NULL) { | |
1408 | if (small_entry) { | |
1409 | entry = small_entry; | |
1410 | } else { | |
1411 | if (!tried_min_extra_isize && | |
1412 | s_min_extra_isize) { | |
1413 | tried_min_extra_isize++; | |
1414 | new_extra_isize = s_min_extra_isize; | |
6e4ea8e3 DJ |
1415 | kfree(is); is = NULL; |
1416 | kfree(bs); bs = NULL; | |
dcb9917b | 1417 | brelse(bh); |
6dd4ee7c KS |
1418 | goto retry; |
1419 | } | |
1420 | error = -1; | |
1421 | goto cleanup; | |
1422 | } | |
1423 | } | |
1424 | offs = le16_to_cpu(entry->e_value_offs); | |
1425 | size = le32_to_cpu(entry->e_value_size); | |
1426 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
1427 | i.name_index = entry->e_name_index, | |
1428 | buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); | |
1429 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
1430 | if (!buffer || !b_entry_name) { | |
1431 | error = -ENOMEM; | |
1432 | goto cleanup; | |
1433 | } | |
1434 | /* Save the entry name and the entry value */ | |
1435 | memcpy(buffer, (void *)IFIRST(header) + offs, | |
1436 | EXT4_XATTR_SIZE(size)); | |
1437 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); | |
1438 | b_entry_name[entry->e_name_len] = '\0'; | |
1439 | i.name = b_entry_name; | |
1440 | ||
1441 | error = ext4_get_inode_loc(inode, &is->iloc); | |
1442 | if (error) | |
1443 | goto cleanup; | |
1444 | ||
1445 | error = ext4_xattr_ibody_find(inode, &i, is); | |
1446 | if (error) | |
1447 | goto cleanup; | |
1448 | ||
1449 | /* Remove the chosen entry from the inode */ | |
1450 | error = ext4_xattr_ibody_set(handle, inode, &i, is); | |
9aaab058 RK |
1451 | if (error) |
1452 | goto cleanup; | |
6dd4ee7c KS |
1453 | |
1454 | entry = IFIRST(header); | |
1455 | if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) | |
1456 | shift_bytes = new_extra_isize; | |
1457 | else | |
1458 | shift_bytes = entry_size + size; | |
1459 | /* Adjust the offsets and shift the remaining entries ahead */ | |
1460 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - | |
1461 | shift_bytes, (void *)raw_inode + | |
1462 | EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, | |
1463 | (void *)header, total_ino - entry_size, | |
1464 | inode->i_sb->s_blocksize); | |
1465 | ||
1466 | extra_isize += shift_bytes; | |
1467 | new_extra_isize -= shift_bytes; | |
1468 | EXT4_I(inode)->i_extra_isize = extra_isize; | |
1469 | ||
1470 | i.name = b_entry_name; | |
1471 | i.value = buffer; | |
ac39849d | 1472 | i.value_len = size; |
6dd4ee7c KS |
1473 | error = ext4_xattr_block_find(inode, &i, bs); |
1474 | if (error) | |
1475 | goto cleanup; | |
1476 | ||
1477 | /* Add entry which was removed from the inode into the block */ | |
1478 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
1479 | if (error) | |
1480 | goto cleanup; | |
1481 | kfree(b_entry_name); | |
1482 | kfree(buffer); | |
d3533d72 JL |
1483 | b_entry_name = NULL; |
1484 | buffer = NULL; | |
6dd4ee7c KS |
1485 | brelse(is->iloc.bh); |
1486 | kfree(is); | |
1487 | kfree(bs); | |
1488 | } | |
1489 | brelse(bh); | |
1490 | up_write(&EXT4_I(inode)->xattr_sem); | |
1491 | return 0; | |
1492 | ||
1493 | cleanup: | |
1494 | kfree(b_entry_name); | |
1495 | kfree(buffer); | |
1496 | if (is) | |
1497 | brelse(is->iloc.bh); | |
1498 | kfree(is); | |
1499 | kfree(bs); | |
1500 | brelse(bh); | |
1501 | up_write(&EXT4_I(inode)->xattr_sem); | |
1502 | return error; | |
1503 | } | |
1504 | ||
1505 | ||
1506 | ||
ac27a0ec | 1507 | /* |
617ba13b | 1508 | * ext4_xattr_delete_inode() |
ac27a0ec DK |
1509 | * |
1510 | * Free extended attribute resources associated with this inode. This | |
1511 | * is called immediately before an inode is freed. We have exclusive | |
1512 | * access to the inode. | |
1513 | */ | |
1514 | void | |
617ba13b | 1515 | ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
1516 | { |
1517 | struct buffer_head *bh = NULL; | |
1518 | ||
617ba13b | 1519 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 1520 | goto cleanup; |
617ba13b | 1521 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec | 1522 | if (!bh) { |
24676da4 TT |
1523 | EXT4_ERROR_INODE(inode, "block %llu read error", |
1524 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1525 | goto cleanup; |
1526 | } | |
617ba13b | 1527 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 1528 | BHDR(bh)->h_blocks != cpu_to_le32(1)) { |
24676da4 TT |
1529 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1530 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1531 | goto cleanup; |
1532 | } | |
617ba13b MC |
1533 | ext4_xattr_release_block(handle, inode, bh); |
1534 | EXT4_I(inode)->i_file_acl = 0; | |
ac27a0ec DK |
1535 | |
1536 | cleanup: | |
1537 | brelse(bh); | |
1538 | } | |
1539 | ||
ac27a0ec | 1540 | /* |
617ba13b | 1541 | * ext4_xattr_cache_insert() |
ac27a0ec DK |
1542 | * |
1543 | * Create a new entry in the extended attribute cache, and insert | |
1544 | * it unless such an entry is already in the cache. | |
1545 | * | |
1546 | * Returns 0, or a negative error number on failure. | |
1547 | */ | |
1548 | static void | |
7a2508e1 | 1549 | ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) |
ac27a0ec DK |
1550 | { |
1551 | __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); | |
ac27a0ec DK |
1552 | int error; |
1553 | ||
7a2508e1 JK |
1554 | error = mb_cache_entry_create(ext4_mb_cache, GFP_NOFS, hash, |
1555 | bh->b_blocknr); | |
ac27a0ec | 1556 | if (error) { |
82939d79 | 1557 | if (error == -EBUSY) |
ac27a0ec | 1558 | ea_bdebug(bh, "already in cache"); |
82939d79 | 1559 | } else |
ac27a0ec | 1560 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
1561 | } |
1562 | ||
1563 | /* | |
617ba13b | 1564 | * ext4_xattr_cmp() |
ac27a0ec DK |
1565 | * |
1566 | * Compare two extended attribute blocks for equality. | |
1567 | * | |
1568 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
1569 | * a negative error number on errors. | |
1570 | */ | |
1571 | static int | |
617ba13b MC |
1572 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
1573 | struct ext4_xattr_header *header2) | |
ac27a0ec | 1574 | { |
617ba13b | 1575 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
1576 | |
1577 | entry1 = ENTRY(header1+1); | |
1578 | entry2 = ENTRY(header2+1); | |
1579 | while (!IS_LAST_ENTRY(entry1)) { | |
1580 | if (IS_LAST_ENTRY(entry2)) | |
1581 | return 1; | |
1582 | if (entry1->e_hash != entry2->e_hash || | |
1583 | entry1->e_name_index != entry2->e_name_index || | |
1584 | entry1->e_name_len != entry2->e_name_len || | |
1585 | entry1->e_value_size != entry2->e_value_size || | |
1586 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) | |
1587 | return 1; | |
1588 | if (entry1->e_value_block != 0 || entry2->e_value_block != 0) | |
6a797d27 | 1589 | return -EFSCORRUPTED; |
ac27a0ec DK |
1590 | if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), |
1591 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), | |
1592 | le32_to_cpu(entry1->e_value_size))) | |
1593 | return 1; | |
1594 | ||
617ba13b MC |
1595 | entry1 = EXT4_XATTR_NEXT(entry1); |
1596 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
1597 | } |
1598 | if (!IS_LAST_ENTRY(entry2)) | |
1599 | return 1; | |
1600 | return 0; | |
1601 | } | |
1602 | ||
1603 | /* | |
617ba13b | 1604 | * ext4_xattr_cache_find() |
ac27a0ec DK |
1605 | * |
1606 | * Find an identical extended attribute block. | |
1607 | * | |
1608 | * Returns a pointer to the block found, or NULL if such a block was | |
1609 | * not found or an error occurred. | |
1610 | */ | |
1611 | static struct buffer_head * | |
617ba13b | 1612 | ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, |
7a2508e1 | 1613 | struct mb_cache_entry **pce) |
ac27a0ec DK |
1614 | { |
1615 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 JK |
1616 | struct mb_cache_entry *ce; |
1617 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); | |
ac27a0ec DK |
1618 | |
1619 | if (!header->h_hash) | |
1620 | return NULL; /* never share */ | |
1621 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
7a2508e1 | 1622 | ce = mb_cache_entry_find_first(ext4_mb_cache, hash); |
ac27a0ec DK |
1623 | while (ce) { |
1624 | struct buffer_head *bh; | |
1625 | ||
ac27a0ec DK |
1626 | bh = sb_bread(inode->i_sb, ce->e_block); |
1627 | if (!bh) { | |
24676da4 TT |
1628 | EXT4_ERROR_INODE(inode, "block %lu read error", |
1629 | (unsigned long) ce->e_block); | |
ac27a0ec | 1630 | } else if (le32_to_cpu(BHDR(bh)->h_refcount) >= |
617ba13b | 1631 | EXT4_XATTR_REFCOUNT_MAX) { |
ac27a0ec DK |
1632 | ea_idebug(inode, "block %lu refcount %d>=%d", |
1633 | (unsigned long) ce->e_block, | |
1634 | le32_to_cpu(BHDR(bh)->h_refcount), | |
617ba13b MC |
1635 | EXT4_XATTR_REFCOUNT_MAX); |
1636 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { | |
ac27a0ec DK |
1637 | *pce = ce; |
1638 | return bh; | |
1639 | } | |
1640 | brelse(bh); | |
7a2508e1 | 1641 | ce = mb_cache_entry_find_next(ext4_mb_cache, ce); |
ac27a0ec DK |
1642 | } |
1643 | return NULL; | |
1644 | } | |
1645 | ||
1646 | #define NAME_HASH_SHIFT 5 | |
1647 | #define VALUE_HASH_SHIFT 16 | |
1648 | ||
1649 | /* | |
617ba13b | 1650 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
1651 | * |
1652 | * Compute the hash of an extended attribute. | |
1653 | */ | |
617ba13b MC |
1654 | static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, |
1655 | struct ext4_xattr_entry *entry) | |
ac27a0ec DK |
1656 | { |
1657 | __u32 hash = 0; | |
1658 | char *name = entry->e_name; | |
1659 | int n; | |
1660 | ||
2b2d6d01 | 1661 | for (n = 0; n < entry->e_name_len; n++) { |
ac27a0ec DK |
1662 | hash = (hash << NAME_HASH_SHIFT) ^ |
1663 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
1664 | *name++; | |
1665 | } | |
1666 | ||
1667 | if (entry->e_value_block == 0 && entry->e_value_size != 0) { | |
1668 | __le32 *value = (__le32 *)((char *)header + | |
1669 | le16_to_cpu(entry->e_value_offs)); | |
1670 | for (n = (le32_to_cpu(entry->e_value_size) + | |
617ba13b | 1671 | EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { |
ac27a0ec DK |
1672 | hash = (hash << VALUE_HASH_SHIFT) ^ |
1673 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
1674 | le32_to_cpu(*value++); | |
1675 | } | |
1676 | } | |
1677 | entry->e_hash = cpu_to_le32(hash); | |
1678 | } | |
1679 | ||
1680 | #undef NAME_HASH_SHIFT | |
1681 | #undef VALUE_HASH_SHIFT | |
1682 | ||
1683 | #define BLOCK_HASH_SHIFT 16 | |
1684 | ||
1685 | /* | |
617ba13b | 1686 | * ext4_xattr_rehash() |
ac27a0ec DK |
1687 | * |
1688 | * Re-compute the extended attribute hash value after an entry has changed. | |
1689 | */ | |
617ba13b MC |
1690 | static void ext4_xattr_rehash(struct ext4_xattr_header *header, |
1691 | struct ext4_xattr_entry *entry) | |
ac27a0ec | 1692 | { |
617ba13b | 1693 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
1694 | __u32 hash = 0; |
1695 | ||
617ba13b | 1696 | ext4_xattr_hash_entry(header, entry); |
ac27a0ec DK |
1697 | here = ENTRY(header+1); |
1698 | while (!IS_LAST_ENTRY(here)) { | |
1699 | if (!here->e_hash) { | |
1700 | /* Block is not shared if an entry's hash value == 0 */ | |
1701 | hash = 0; | |
1702 | break; | |
1703 | } | |
1704 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
1705 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
1706 | le32_to_cpu(here->e_hash); | |
617ba13b | 1707 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
1708 | } |
1709 | header->h_hash = cpu_to_le32(hash); | |
1710 | } | |
1711 | ||
1712 | #undef BLOCK_HASH_SHIFT | |
1713 | ||
9c191f70 M |
1714 | #define HASH_BUCKET_BITS 10 |
1715 | ||
7a2508e1 | 1716 | struct mb_cache * |
82939d79 | 1717 | ext4_xattr_create_cache(void) |
ac27a0ec | 1718 | { |
7a2508e1 | 1719 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
1720 | } |
1721 | ||
7a2508e1 | 1722 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 1723 | { |
9c191f70 | 1724 | if (cache) |
7a2508e1 | 1725 | mb_cache_destroy(cache); |
ac27a0ec | 1726 | } |
9c191f70 | 1727 |