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 | 123 | __u32 csum; |
d6a77105 | 124 | __le64 dsk_block_nr = cpu_to_le64(block_nr); |
b47820ed DJ |
125 | __u32 dummy_csum = 0; |
126 | int offset = offsetof(struct ext4_xattr_header, h_checksum); | |
cc8e94fd | 127 | |
d6a77105 TT |
128 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, |
129 | sizeof(dsk_block_nr)); | |
b47820ed DJ |
130 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); |
131 | csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); | |
132 | offset += sizeof(dummy_csum); | |
133 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, | |
134 | EXT4_BLOCK_SIZE(inode->i_sb) - offset); | |
41eb70dd | 135 | |
cc8e94fd DW |
136 | return cpu_to_le32(csum); |
137 | } | |
138 | ||
139 | static int ext4_xattr_block_csum_verify(struct inode *inode, | |
140 | sector_t block_nr, | |
141 | struct ext4_xattr_header *hdr) | |
142 | { | |
9aa5d32b | 143 | if (ext4_has_metadata_csum(inode->i_sb) && |
cc8e94fd DW |
144 | (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr))) |
145 | return 0; | |
146 | return 1; | |
147 | } | |
148 | ||
149 | static void ext4_xattr_block_csum_set(struct inode *inode, | |
150 | sector_t block_nr, | |
151 | struct ext4_xattr_header *hdr) | |
152 | { | |
9aa5d32b | 153 | if (!ext4_has_metadata_csum(inode->i_sb)) |
cc8e94fd DW |
154 | return; |
155 | ||
156 | hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr); | |
157 | } | |
158 | ||
159 | static inline int ext4_handle_dirty_xattr_block(handle_t *handle, | |
160 | struct inode *inode, | |
161 | struct buffer_head *bh) | |
162 | { | |
163 | ext4_xattr_block_csum_set(inode, bh->b_blocknr, BHDR(bh)); | |
164 | return ext4_handle_dirty_metadata(handle, inode, bh); | |
165 | } | |
166 | ||
11e27528 | 167 | static inline const struct xattr_handler * |
617ba13b | 168 | ext4_xattr_handler(int name_index) |
ac27a0ec | 169 | { |
11e27528 | 170 | const struct xattr_handler *handler = NULL; |
ac27a0ec | 171 | |
617ba13b MC |
172 | if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
173 | handler = ext4_xattr_handler_map[name_index]; | |
ac27a0ec DK |
174 | return handler; |
175 | } | |
176 | ||
177 | /* | |
178 | * Inode operation listxattr() | |
179 | * | |
2b0143b5 | 180 | * d_inode(dentry)->i_mutex: don't care |
ac27a0ec DK |
181 | */ |
182 | ssize_t | |
617ba13b | 183 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) |
ac27a0ec | 184 | { |
431547b3 | 185 | return ext4_xattr_list(dentry, buffer, size); |
ac27a0ec DK |
186 | } |
187 | ||
188 | static int | |
a0626e75 DW |
189 | ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end, |
190 | void *value_start) | |
ac27a0ec | 191 | { |
a0626e75 DW |
192 | struct ext4_xattr_entry *e = entry; |
193 | ||
194 | while (!IS_LAST_ENTRY(e)) { | |
195 | struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); | |
ac27a0ec | 196 | if ((void *)next >= end) |
6a797d27 | 197 | return -EFSCORRUPTED; |
a0626e75 | 198 | e = next; |
ac27a0ec | 199 | } |
a0626e75 DW |
200 | |
201 | while (!IS_LAST_ENTRY(entry)) { | |
202 | if (entry->e_value_size != 0 && | |
203 | (value_start + le16_to_cpu(entry->e_value_offs) < | |
204 | (void *)e + sizeof(__u32) || | |
205 | value_start + le16_to_cpu(entry->e_value_offs) + | |
206 | le32_to_cpu(entry->e_value_size) > end)) | |
6a797d27 | 207 | return -EFSCORRUPTED; |
a0626e75 DW |
208 | entry = EXT4_XATTR_NEXT(entry); |
209 | } | |
210 | ||
ac27a0ec DK |
211 | return 0; |
212 | } | |
213 | ||
214 | static inline int | |
cc8e94fd | 215 | ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) |
ac27a0ec | 216 | { |
cc8e94fd DW |
217 | int error; |
218 | ||
219 | if (buffer_verified(bh)) | |
220 | return 0; | |
221 | ||
617ba13b | 222 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 223 | BHDR(bh)->h_blocks != cpu_to_le32(1)) |
6a797d27 | 224 | return -EFSCORRUPTED; |
cc8e94fd | 225 | if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh))) |
6a797d27 | 226 | return -EFSBADCRC; |
a0626e75 DW |
227 | error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size, |
228 | bh->b_data); | |
cc8e94fd DW |
229 | if (!error) |
230 | set_buffer_verified(bh); | |
231 | return error; | |
ac27a0ec DK |
232 | } |
233 | ||
9e92f48c TT |
234 | static int |
235 | __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, | |
236 | void *end, const char *function, unsigned int line) | |
237 | { | |
238 | struct ext4_xattr_entry *entry = IFIRST(header); | |
239 | int error = -EFSCORRUPTED; | |
240 | ||
241 | if (((void *) header >= end) || | |
242 | (header->h_magic != le32_to_cpu(EXT4_XATTR_MAGIC))) | |
243 | goto errout; | |
244 | error = ext4_xattr_check_names(entry, end, entry); | |
245 | errout: | |
246 | if (error) | |
247 | __ext4_error_inode(inode, function, line, 0, | |
248 | "corrupted in-inode xattr"); | |
249 | return error; | |
250 | } | |
251 | ||
252 | #define xattr_check_inode(inode, header, end) \ | |
253 | __xattr_check_inode((inode), (header), (end), __func__, __LINE__) | |
254 | ||
ac27a0ec | 255 | static inline int |
617ba13b | 256 | ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) |
ac27a0ec DK |
257 | { |
258 | size_t value_size = le32_to_cpu(entry->e_value_size); | |
259 | ||
260 | if (entry->e_value_block != 0 || value_size > size || | |
261 | le16_to_cpu(entry->e_value_offs) + value_size > size) | |
6a797d27 | 262 | return -EFSCORRUPTED; |
ac27a0ec DK |
263 | return 0; |
264 | } | |
265 | ||
266 | static int | |
617ba13b | 267 | ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, |
ac27a0ec DK |
268 | const char *name, size_t size, int sorted) |
269 | { | |
617ba13b | 270 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
271 | size_t name_len; |
272 | int cmp = 1; | |
273 | ||
274 | if (name == NULL) | |
275 | return -EINVAL; | |
276 | name_len = strlen(name); | |
277 | entry = *pentry; | |
617ba13b | 278 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
ac27a0ec DK |
279 | cmp = name_index - entry->e_name_index; |
280 | if (!cmp) | |
281 | cmp = name_len - entry->e_name_len; | |
282 | if (!cmp) | |
283 | cmp = memcmp(name, entry->e_name, name_len); | |
284 | if (cmp <= 0 && (sorted || cmp == 0)) | |
285 | break; | |
286 | } | |
287 | *pentry = entry; | |
617ba13b | 288 | if (!cmp && ext4_xattr_check_entry(entry, size)) |
6a797d27 | 289 | return -EFSCORRUPTED; |
ac27a0ec DK |
290 | return cmp ? -ENODATA : 0; |
291 | } | |
292 | ||
293 | static int | |
617ba13b | 294 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
295 | void *buffer, size_t buffer_size) |
296 | { | |
297 | struct buffer_head *bh = NULL; | |
617ba13b | 298 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
299 | size_t size; |
300 | int error; | |
7a2508e1 | 301 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
302 | |
303 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
304 | name_index, name, buffer, (long)buffer_size); | |
305 | ||
306 | error = -ENODATA; | |
617ba13b | 307 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 308 | goto cleanup; |
ace36ad4 JP |
309 | ea_idebug(inode, "reading block %llu", |
310 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 311 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
312 | if (!bh) |
313 | goto cleanup; | |
314 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
315 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 316 | if (ext4_xattr_check_block(inode, bh)) { |
12062ddd | 317 | bad_block: |
24676da4 TT |
318 | EXT4_ERROR_INODE(inode, "bad block %llu", |
319 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 320 | error = -EFSCORRUPTED; |
ac27a0ec DK |
321 | goto cleanup; |
322 | } | |
9c191f70 | 323 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
ac27a0ec | 324 | entry = BFIRST(bh); |
617ba13b | 325 | error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); |
6a797d27 | 326 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
327 | goto bad_block; |
328 | if (error) | |
329 | goto cleanup; | |
330 | size = le32_to_cpu(entry->e_value_size); | |
331 | if (buffer) { | |
332 | error = -ERANGE; | |
333 | if (size > buffer_size) | |
334 | goto cleanup; | |
335 | memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), | |
336 | size); | |
337 | } | |
338 | error = size; | |
339 | ||
340 | cleanup: | |
341 | brelse(bh); | |
342 | return error; | |
343 | } | |
344 | ||
879b3825 | 345 | int |
617ba13b | 346 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
347 | void *buffer, size_t buffer_size) |
348 | { | |
617ba13b MC |
349 | struct ext4_xattr_ibody_header *header; |
350 | struct ext4_xattr_entry *entry; | |
351 | struct ext4_inode *raw_inode; | |
352 | struct ext4_iloc iloc; | |
ac27a0ec DK |
353 | size_t size; |
354 | void *end; | |
355 | int error; | |
356 | ||
19f5fb7a | 357 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 358 | return -ENODATA; |
617ba13b | 359 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
360 | if (error) |
361 | return error; | |
617ba13b | 362 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec DK |
363 | header = IHDR(inode, raw_inode); |
364 | entry = IFIRST(header); | |
617ba13b | 365 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 366 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
367 | if (error) |
368 | goto cleanup; | |
617ba13b | 369 | error = ext4_xattr_find_entry(&entry, name_index, name, |
ac27a0ec DK |
370 | end - (void *)entry, 0); |
371 | if (error) | |
372 | goto cleanup; | |
373 | size = le32_to_cpu(entry->e_value_size); | |
374 | if (buffer) { | |
375 | error = -ERANGE; | |
376 | if (size > buffer_size) | |
377 | goto cleanup; | |
378 | memcpy(buffer, (void *)IFIRST(header) + | |
379 | le16_to_cpu(entry->e_value_offs), size); | |
380 | } | |
381 | error = size; | |
382 | ||
383 | cleanup: | |
384 | brelse(iloc.bh); | |
385 | return error; | |
386 | } | |
387 | ||
388 | /* | |
617ba13b | 389 | * ext4_xattr_get() |
ac27a0ec DK |
390 | * |
391 | * Copy an extended attribute into the buffer | |
392 | * provided, or compute the buffer size required. | |
393 | * Buffer is NULL to compute the size of the buffer required. | |
394 | * | |
395 | * Returns a negative error number on failure, or the number of bytes | |
396 | * used / required on success. | |
397 | */ | |
398 | int | |
617ba13b | 399 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
400 | void *buffer, size_t buffer_size) |
401 | { | |
402 | int error; | |
403 | ||
230b8c1a ZZ |
404 | if (strlen(name) > 255) |
405 | return -ERANGE; | |
406 | ||
617ba13b MC |
407 | down_read(&EXT4_I(inode)->xattr_sem); |
408 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
409 | buffer_size); |
410 | if (error == -ENODATA) | |
617ba13b | 411 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 412 | buffer_size); |
617ba13b | 413 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
414 | return error; |
415 | } | |
416 | ||
417 | static int | |
431547b3 | 418 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
419 | char *buffer, size_t buffer_size) |
420 | { | |
421 | size_t rest = buffer_size; | |
422 | ||
617ba13b | 423 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 424 | const struct xattr_handler *handler = |
617ba13b | 425 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec | 426 | |
764a5c6b AG |
427 | if (handler && (!handler->list || handler->list(dentry))) { |
428 | const char *prefix = handler->prefix ?: handler->name; | |
429 | size_t prefix_len = strlen(prefix); | |
430 | size_t size = prefix_len + entry->e_name_len + 1; | |
431 | ||
ac27a0ec DK |
432 | if (buffer) { |
433 | if (size > rest) | |
434 | return -ERANGE; | |
764a5c6b AG |
435 | memcpy(buffer, prefix, prefix_len); |
436 | buffer += prefix_len; | |
437 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
438 | buffer += entry->e_name_len; | |
439 | *buffer++ = 0; | |
ac27a0ec DK |
440 | } |
441 | rest -= size; | |
442 | } | |
443 | } | |
764a5c6b | 444 | return buffer_size - rest; /* total size */ |
ac27a0ec DK |
445 | } |
446 | ||
447 | static int | |
431547b3 | 448 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 449 | { |
2b0143b5 | 450 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
451 | struct buffer_head *bh = NULL; |
452 | int error; | |
7a2508e1 | 453 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
454 | |
455 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
456 | buffer, (long)buffer_size); | |
457 | ||
458 | error = 0; | |
617ba13b | 459 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 460 | goto cleanup; |
ace36ad4 JP |
461 | ea_idebug(inode, "reading block %llu", |
462 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 463 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
464 | error = -EIO; |
465 | if (!bh) | |
466 | goto cleanup; | |
467 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
468 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 469 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
470 | EXT4_ERROR_INODE(inode, "bad block %llu", |
471 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 472 | error = -EFSCORRUPTED; |
ac27a0ec DK |
473 | goto cleanup; |
474 | } | |
9c191f70 | 475 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
431547b3 | 476 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); |
ac27a0ec DK |
477 | |
478 | cleanup: | |
479 | brelse(bh); | |
480 | ||
481 | return error; | |
482 | } | |
483 | ||
484 | static int | |
431547b3 | 485 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 486 | { |
2b0143b5 | 487 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
488 | struct ext4_xattr_ibody_header *header; |
489 | struct ext4_inode *raw_inode; | |
490 | struct ext4_iloc iloc; | |
ac27a0ec DK |
491 | void *end; |
492 | int error; | |
493 | ||
19f5fb7a | 494 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 495 | return 0; |
617ba13b | 496 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
497 | if (error) |
498 | return error; | |
617ba13b | 499 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 500 | header = IHDR(inode, raw_inode); |
617ba13b | 501 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 502 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
503 | if (error) |
504 | goto cleanup; | |
431547b3 | 505 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
506 | buffer, buffer_size); |
507 | ||
508 | cleanup: | |
509 | brelse(iloc.bh); | |
510 | return error; | |
511 | } | |
512 | ||
513 | /* | |
617ba13b | 514 | * ext4_xattr_list() |
ac27a0ec DK |
515 | * |
516 | * Copy a list of attribute names into the buffer | |
517 | * provided, or compute the buffer size required. | |
518 | * Buffer is NULL to compute the size of the buffer required. | |
519 | * | |
520 | * Returns a negative error number on failure, or the number of bytes | |
521 | * used / required on success. | |
522 | */ | |
d3a95d47 | 523 | static int |
431547b3 | 524 | ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 525 | { |
eaeef867 | 526 | int ret, ret2; |
ac27a0ec | 527 | |
2b0143b5 | 528 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
529 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
530 | if (ret < 0) | |
531 | goto errout; | |
532 | if (buffer) { | |
533 | buffer += ret; | |
534 | buffer_size -= ret; | |
ac27a0ec | 535 | } |
eaeef867 TT |
536 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
537 | if (ret < 0) | |
538 | goto errout; | |
539 | ret += ret2; | |
540 | errout: | |
2b0143b5 | 541 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 542 | return ret; |
ac27a0ec DK |
543 | } |
544 | ||
545 | /* | |
617ba13b | 546 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
547 | * not set, set it. |
548 | */ | |
617ba13b | 549 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
550 | struct super_block *sb) |
551 | { | |
e2b911c5 | 552 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
553 | return; |
554 | ||
5d601255 | 555 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 556 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
e2b911c5 | 557 | ext4_set_feature_xattr(sb); |
a0375156 | 558 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec | 559 | } |
ac27a0ec DK |
560 | } |
561 | ||
562 | /* | |
ec4cb1aa JK |
563 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
564 | * otherwise free the block. | |
ac27a0ec DK |
565 | */ |
566 | static void | |
617ba13b | 567 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
ac27a0ec DK |
568 | struct buffer_head *bh) |
569 | { | |
6048c64b AG |
570 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
571 | u32 hash, ref; | |
8a2bfdcb | 572 | int error = 0; |
ac27a0ec | 573 | |
5d601255 | 574 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
575 | error = ext4_journal_get_write_access(handle, bh); |
576 | if (error) | |
577 | goto out; | |
578 | ||
579 | lock_buffer(bh); | |
6048c64b AG |
580 | hash = le32_to_cpu(BHDR(bh)->h_hash); |
581 | ref = le32_to_cpu(BHDR(bh)->h_refcount); | |
582 | if (ref == 1) { | |
ac27a0ec | 583 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
584 | /* |
585 | * This must happen under buffer lock for | |
586 | * ext4_xattr_block_set() to reliably detect freed block | |
587 | */ | |
6048c64b | 588 | mb_cache_entry_delete_block(ext4_mb_cache, hash, bh->b_blocknr); |
ac27a0ec | 589 | get_bh(bh); |
ec4cb1aa | 590 | unlock_buffer(bh); |
e6362609 TT |
591 | ext4_free_blocks(handle, inode, bh, 0, 1, |
592 | EXT4_FREE_BLOCKS_METADATA | | |
593 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 594 | } else { |
6048c64b AG |
595 | ref--; |
596 | BHDR(bh)->h_refcount = cpu_to_le32(ref); | |
597 | if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { | |
598 | struct mb_cache_entry *ce; | |
599 | ||
600 | ce = mb_cache_entry_get(ext4_mb_cache, hash, | |
601 | bh->b_blocknr); | |
602 | if (ce) { | |
603 | ce->e_reusable = 1; | |
604 | mb_cache_entry_put(ext4_mb_cache, ce); | |
605 | } | |
606 | } | |
607 | ||
ec4cb1aa JK |
608 | /* |
609 | * Beware of this ugliness: Releasing of xattr block references | |
610 | * from different inodes can race and so we have to protect | |
611 | * from a race where someone else frees the block (and releases | |
612 | * its journal_head) before we are done dirtying the buffer. In | |
613 | * nojournal mode this race is harmless and we actually cannot | |
614 | * call ext4_handle_dirty_xattr_block() with locked buffer as | |
615 | * that function can call sync_dirty_buffer() so for that case | |
616 | * we handle the dirtying after unlocking the buffer. | |
617 | */ | |
618 | if (ext4_handle_valid(handle)) | |
619 | error = ext4_handle_dirty_xattr_block(handle, inode, | |
620 | bh); | |
c1bb05a6 | 621 | unlock_buffer(bh); |
ec4cb1aa JK |
622 | if (!ext4_handle_valid(handle)) |
623 | error = ext4_handle_dirty_xattr_block(handle, inode, | |
624 | bh); | |
8a2bfdcb | 625 | if (IS_SYNC(inode)) |
0390131b | 626 | ext4_handle_sync(handle); |
1231b3a1 | 627 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
628 | ea_bdebug(bh, "refcount now=%d; releasing", |
629 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 630 | } |
8a2bfdcb MC |
631 | out: |
632 | ext4_std_error(inode->i_sb, error); | |
633 | return; | |
ac27a0ec DK |
634 | } |
635 | ||
6dd4ee7c KS |
636 | /* |
637 | * Find the available free space for EAs. This also returns the total number of | |
638 | * bytes used by EA entries. | |
639 | */ | |
640 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
641 | size_t *min_offs, void *base, int *total) | |
642 | { | |
643 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
6dd4ee7c KS |
644 | if (!last->e_value_block && last->e_value_size) { |
645 | size_t offs = le16_to_cpu(last->e_value_offs); | |
646 | if (offs < *min_offs) | |
647 | *min_offs = offs; | |
648 | } | |
7b1b2c1b TT |
649 | if (total) |
650 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
651 | } |
652 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
653 | } | |
654 | ||
ac27a0ec | 655 | static int |
617ba13b | 656 | ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) |
ac27a0ec | 657 | { |
617ba13b | 658 | struct ext4_xattr_entry *last; |
ac27a0ec DK |
659 | size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); |
660 | ||
661 | /* Compute min_offs and last. */ | |
662 | last = s->first; | |
617ba13b | 663 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
ac27a0ec DK |
664 | if (!last->e_value_block && last->e_value_size) { |
665 | size_t offs = le16_to_cpu(last->e_value_offs); | |
666 | if (offs < min_offs) | |
667 | min_offs = offs; | |
668 | } | |
669 | } | |
670 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); | |
671 | if (!s->not_found) { | |
672 | if (!s->here->e_value_block && s->here->e_value_size) { | |
673 | size_t size = le32_to_cpu(s->here->e_value_size); | |
617ba13b | 674 | free += EXT4_XATTR_SIZE(size); |
ac27a0ec | 675 | } |
617ba13b | 676 | free += EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
677 | } |
678 | if (i->value) { | |
5f80f62a | 679 | if (free < EXT4_XATTR_LEN(name_len) + |
617ba13b | 680 | EXT4_XATTR_SIZE(i->value_len)) |
ac27a0ec DK |
681 | return -ENOSPC; |
682 | } | |
683 | ||
684 | if (i->value && s->not_found) { | |
685 | /* Insert the new name. */ | |
617ba13b | 686 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
687 | size_t rest = (void *)last - (void *)s->here + sizeof(__u32); |
688 | memmove((void *)s->here + size, s->here, rest); | |
689 | memset(s->here, 0, size); | |
690 | s->here->e_name_index = i->name_index; | |
691 | s->here->e_name_len = name_len; | |
692 | memcpy(s->here->e_name, i->name, name_len); | |
693 | } else { | |
694 | if (!s->here->e_value_block && s->here->e_value_size) { | |
695 | void *first_val = s->base + min_offs; | |
696 | size_t offs = le16_to_cpu(s->here->e_value_offs); | |
697 | void *val = s->base + offs; | |
617ba13b | 698 | size_t size = EXT4_XATTR_SIZE( |
ac27a0ec DK |
699 | le32_to_cpu(s->here->e_value_size)); |
700 | ||
617ba13b | 701 | if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { |
ac27a0ec DK |
702 | /* The old and the new value have the same |
703 | size. Just replace. */ | |
704 | s->here->e_value_size = | |
705 | cpu_to_le32(i->value_len); | |
bd9926e8 TT |
706 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
707 | memset(val, 0, size); | |
708 | } else { | |
709 | /* Clear pad bytes first. */ | |
710 | memset(val + size - EXT4_XATTR_PAD, 0, | |
711 | EXT4_XATTR_PAD); | |
712 | memcpy(val, i->value, i->value_len); | |
713 | } | |
ac27a0ec DK |
714 | return 0; |
715 | } | |
716 | ||
717 | /* Remove the old value. */ | |
718 | memmove(first_val + size, first_val, val - first_val); | |
719 | memset(first_val, 0, size); | |
720 | s->here->e_value_size = 0; | |
721 | s->here->e_value_offs = 0; | |
722 | min_offs += size; | |
723 | ||
724 | /* Adjust all value offsets. */ | |
725 | last = s->first; | |
726 | while (!IS_LAST_ENTRY(last)) { | |
727 | size_t o = le16_to_cpu(last->e_value_offs); | |
728 | if (!last->e_value_block && | |
729 | last->e_value_size && o < offs) | |
730 | last->e_value_offs = | |
731 | cpu_to_le16(o + size); | |
617ba13b | 732 | last = EXT4_XATTR_NEXT(last); |
ac27a0ec DK |
733 | } |
734 | } | |
735 | if (!i->value) { | |
736 | /* Remove the old name. */ | |
617ba13b | 737 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
738 | last = ENTRY((void *)last - size); |
739 | memmove(s->here, (void *)s->here + size, | |
740 | (void *)last - (void *)s->here + sizeof(__u32)); | |
741 | memset(last, 0, size); | |
742 | } | |
743 | } | |
744 | ||
745 | if (i->value) { | |
746 | /* Insert the new value. */ | |
747 | s->here->e_value_size = cpu_to_le32(i->value_len); | |
748 | if (i->value_len) { | |
617ba13b | 749 | size_t size = EXT4_XATTR_SIZE(i->value_len); |
ac27a0ec DK |
750 | void *val = s->base + min_offs - size; |
751 | s->here->e_value_offs = cpu_to_le16(min_offs - size); | |
bd9926e8 TT |
752 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
753 | memset(val, 0, size); | |
754 | } else { | |
755 | /* Clear the pad bytes first. */ | |
756 | memset(val + size - EXT4_XATTR_PAD, 0, | |
757 | EXT4_XATTR_PAD); | |
758 | memcpy(val, i->value, i->value_len); | |
759 | } | |
ac27a0ec DK |
760 | } |
761 | } | |
762 | return 0; | |
763 | } | |
764 | ||
617ba13b MC |
765 | struct ext4_xattr_block_find { |
766 | struct ext4_xattr_search s; | |
ac27a0ec DK |
767 | struct buffer_head *bh; |
768 | }; | |
769 | ||
770 | static int | |
617ba13b MC |
771 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
772 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
773 | { |
774 | struct super_block *sb = inode->i_sb; | |
775 | int error; | |
776 | ||
777 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
778 | i->name_index, i->name, i->value, (long)i->value_len); | |
779 | ||
617ba13b | 780 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 781 | /* The inode already has an extended attribute block. */ |
617ba13b | 782 | bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
783 | error = -EIO; |
784 | if (!bs->bh) | |
785 | goto cleanup; | |
786 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", | |
787 | atomic_read(&(bs->bh->b_count)), | |
788 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
cc8e94fd | 789 | if (ext4_xattr_check_block(inode, bs->bh)) { |
24676da4 TT |
790 | EXT4_ERROR_INODE(inode, "bad block %llu", |
791 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 792 | error = -EFSCORRUPTED; |
ac27a0ec DK |
793 | goto cleanup; |
794 | } | |
795 | /* Find the named attribute. */ | |
796 | bs->s.base = BHDR(bs->bh); | |
797 | bs->s.first = BFIRST(bs->bh); | |
798 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
799 | bs->s.here = bs->s.first; | |
617ba13b | 800 | error = ext4_xattr_find_entry(&bs->s.here, i->name_index, |
ac27a0ec DK |
801 | i->name, bs->bh->b_size, 1); |
802 | if (error && error != -ENODATA) | |
803 | goto cleanup; | |
804 | bs->s.not_found = error; | |
805 | } | |
806 | error = 0; | |
807 | ||
808 | cleanup: | |
809 | return error; | |
810 | } | |
811 | ||
812 | static int | |
617ba13b MC |
813 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
814 | struct ext4_xattr_info *i, | |
815 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
816 | { |
817 | struct super_block *sb = inode->i_sb; | |
818 | struct buffer_head *new_bh = NULL; | |
617ba13b | 819 | struct ext4_xattr_search *s = &bs->s; |
7a2508e1 | 820 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 821 | int error = 0; |
7a2508e1 | 822 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec | 823 | |
617ba13b | 824 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec DK |
825 | |
826 | if (i->value && i->value_len > sb->s_blocksize) | |
827 | return -ENOSPC; | |
828 | if (s->base) { | |
5d601255 | 829 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
830 | error = ext4_journal_get_write_access(handle, bs->bh); |
831 | if (error) | |
832 | goto cleanup; | |
833 | lock_buffer(bs->bh); | |
834 | ||
ac27a0ec | 835 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
836 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
837 | ||
838 | /* | |
839 | * This must happen under buffer lock for | |
840 | * ext4_xattr_block_set() to reliably detect modified | |
841 | * block | |
842 | */ | |
7a2508e1 JK |
843 | mb_cache_entry_delete_block(ext4_mb_cache, hash, |
844 | bs->bh->b_blocknr); | |
ac27a0ec | 845 | ea_bdebug(bs->bh, "modifying in-place"); |
617ba13b | 846 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
847 | if (!error) { |
848 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 849 | ext4_xattr_rehash(header(s->base), |
ac27a0ec | 850 | s->here); |
9c191f70 M |
851 | ext4_xattr_cache_insert(ext4_mb_cache, |
852 | bs->bh); | |
ac27a0ec DK |
853 | } |
854 | unlock_buffer(bs->bh); | |
6a797d27 | 855 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
856 | goto bad_block; |
857 | if (!error) | |
cc8e94fd DW |
858 | error = ext4_handle_dirty_xattr_block(handle, |
859 | inode, | |
860 | bs->bh); | |
ac27a0ec DK |
861 | if (error) |
862 | goto cleanup; | |
863 | goto inserted; | |
864 | } else { | |
865 | int offset = (char *)s->here - bs->bh->b_data; | |
866 | ||
8a2bfdcb | 867 | unlock_buffer(bs->bh); |
ac27a0ec | 868 | ea_bdebug(bs->bh, "cloning"); |
216553c4 | 869 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
870 | error = -ENOMEM; |
871 | if (s->base == NULL) | |
872 | goto cleanup; | |
873 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
874 | s->first = ENTRY(header(s->base)+1); | |
875 | header(s->base)->h_refcount = cpu_to_le32(1); | |
876 | s->here = ENTRY(s->base + offset); | |
877 | s->end = s->base + bs->bh->b_size; | |
878 | } | |
879 | } else { | |
880 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 881 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
882 | /* assert(header == s->base) */ |
883 | error = -ENOMEM; | |
884 | if (s->base == NULL) | |
885 | goto cleanup; | |
617ba13b | 886 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
887 | header(s->base)->h_blocks = cpu_to_le32(1); |
888 | header(s->base)->h_refcount = cpu_to_le32(1); | |
889 | s->first = ENTRY(header(s->base)+1); | |
890 | s->here = ENTRY(header(s->base)+1); | |
891 | s->end = s->base + sb->s_blocksize; | |
892 | } | |
893 | ||
617ba13b | 894 | error = ext4_xattr_set_entry(i, s); |
6a797d27 | 895 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
896 | goto bad_block; |
897 | if (error) | |
898 | goto cleanup; | |
899 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 900 | ext4_xattr_rehash(header(s->base), s->here); |
ac27a0ec DK |
901 | |
902 | inserted: | |
903 | if (!IS_LAST_ENTRY(s->first)) { | |
617ba13b | 904 | new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); |
ac27a0ec DK |
905 | if (new_bh) { |
906 | /* We found an identical block in the cache. */ | |
907 | if (new_bh == bs->bh) | |
908 | ea_bdebug(new_bh, "keeping"); | |
909 | else { | |
6048c64b AG |
910 | u32 ref; |
911 | ||
ac27a0ec DK |
912 | /* The old block is released after updating |
913 | the inode. */ | |
1231b3a1 LC |
914 | error = dquot_alloc_block(inode, |
915 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 916 | if (error) |
ac27a0ec | 917 | goto cleanup; |
5d601255 | 918 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 919 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
920 | new_bh); |
921 | if (error) | |
922 | goto cleanup_dquot; | |
923 | lock_buffer(new_bh); | |
82939d79 JK |
924 | /* |
925 | * We have to be careful about races with | |
6048c64b AG |
926 | * freeing, rehashing or adding references to |
927 | * xattr block. Once we hold buffer lock xattr | |
928 | * block's state is stable so we can check | |
929 | * whether the block got freed / rehashed or | |
930 | * not. Since we unhash mbcache entry under | |
931 | * buffer lock when freeing / rehashing xattr | |
932 | * block, checking whether entry is still | |
933 | * hashed is reliable. Same rules hold for | |
934 | * e_reusable handling. | |
82939d79 | 935 | */ |
6048c64b AG |
936 | if (hlist_bl_unhashed(&ce->e_hash_list) || |
937 | !ce->e_reusable) { | |
82939d79 JK |
938 | /* |
939 | * Undo everything and check mbcache | |
940 | * again. | |
941 | */ | |
942 | unlock_buffer(new_bh); | |
943 | dquot_free_block(inode, | |
944 | EXT4_C2B(EXT4_SB(sb), | |
945 | 1)); | |
946 | brelse(new_bh); | |
7a2508e1 | 947 | mb_cache_entry_put(ext4_mb_cache, ce); |
82939d79 JK |
948 | ce = NULL; |
949 | new_bh = NULL; | |
950 | goto inserted; | |
951 | } | |
6048c64b AG |
952 | ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
953 | BHDR(new_bh)->h_refcount = cpu_to_le32(ref); | |
954 | if (ref >= EXT4_XATTR_REFCOUNT_MAX) | |
955 | ce->e_reusable = 0; | |
ac27a0ec | 956 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
6048c64b | 957 | ref); |
ac27a0ec | 958 | unlock_buffer(new_bh); |
cc8e94fd DW |
959 | error = ext4_handle_dirty_xattr_block(handle, |
960 | inode, | |
961 | new_bh); | |
ac27a0ec DK |
962 | if (error) |
963 | goto cleanup_dquot; | |
964 | } | |
7a2508e1 JK |
965 | mb_cache_entry_touch(ext4_mb_cache, ce); |
966 | mb_cache_entry_put(ext4_mb_cache, ce); | |
ac27a0ec DK |
967 | ce = NULL; |
968 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
969 | /* We were modifying this block in-place. */ | |
970 | ea_bdebug(bs->bh, "keeping this block"); | |
971 | new_bh = bs->bh; | |
972 | get_bh(new_bh); | |
973 | } else { | |
974 | /* We need to allocate a new block */ | |
fb0a387d ES |
975 | ext4_fsblk_t goal, block; |
976 | ||
977 | goal = ext4_group_first_block_no(sb, | |
d00a6d7b | 978 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
979 | |
980 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 981 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
982 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
983 | ||
55f020db AH |
984 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
985 | NULL, &error); | |
ac27a0ec DK |
986 | if (error) |
987 | goto cleanup; | |
fb0a387d | 988 | |
12e9b892 | 989 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
990 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
991 | ||
ace36ad4 JP |
992 | ea_idebug(inode, "creating block %llu", |
993 | (unsigned long long)block); | |
ac27a0ec DK |
994 | |
995 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 996 | if (unlikely(!new_bh)) { |
860d21e2 | 997 | error = -ENOMEM; |
ac27a0ec | 998 | getblk_failed: |
7dc57615 | 999 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 1000 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
1001 | goto cleanup; |
1002 | } | |
1003 | lock_buffer(new_bh); | |
617ba13b | 1004 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
1005 | if (error) { |
1006 | unlock_buffer(new_bh); | |
860d21e2 | 1007 | error = -EIO; |
ac27a0ec DK |
1008 | goto getblk_failed; |
1009 | } | |
1010 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
1011 | set_buffer_uptodate(new_bh); | |
1012 | unlock_buffer(new_bh); | |
9c191f70 | 1013 | ext4_xattr_cache_insert(ext4_mb_cache, new_bh); |
cc8e94fd DW |
1014 | error = ext4_handle_dirty_xattr_block(handle, |
1015 | inode, new_bh); | |
ac27a0ec DK |
1016 | if (error) |
1017 | goto cleanup; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | /* Update the inode. */ | |
617ba13b | 1022 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
1023 | |
1024 | /* Drop the previous xattr block. */ | |
1025 | if (bs->bh && bs->bh != new_bh) | |
617ba13b | 1026 | ext4_xattr_release_block(handle, inode, bs->bh); |
ac27a0ec DK |
1027 | error = 0; |
1028 | ||
1029 | cleanup: | |
1030 | if (ce) | |
7a2508e1 | 1031 | mb_cache_entry_put(ext4_mb_cache, ce); |
ac27a0ec DK |
1032 | brelse(new_bh); |
1033 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
1034 | kfree(s->base); | |
1035 | ||
1036 | return error; | |
1037 | ||
1038 | cleanup_dquot: | |
1231b3a1 | 1039 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
1040 | goto cleanup; |
1041 | ||
1042 | bad_block: | |
24676da4 TT |
1043 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1044 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1045 | goto cleanup; |
1046 | ||
1047 | #undef header | |
1048 | } | |
1049 | ||
879b3825 TM |
1050 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
1051 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 1052 | { |
617ba13b MC |
1053 | struct ext4_xattr_ibody_header *header; |
1054 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
1055 | int error; |
1056 | ||
617ba13b | 1057 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1058 | return 0; |
617ba13b | 1059 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
1060 | header = IHDR(inode, raw_inode); |
1061 | is->s.base = is->s.first = IFIRST(header); | |
1062 | is->s.here = is->s.first; | |
617ba13b | 1063 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 1064 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
9e92f48c | 1065 | error = xattr_check_inode(inode, header, is->s.end); |
ac27a0ec DK |
1066 | if (error) |
1067 | return error; | |
1068 | /* Find the named attribute. */ | |
617ba13b | 1069 | error = ext4_xattr_find_entry(&is->s.here, i->name_index, |
ac27a0ec DK |
1070 | i->name, is->s.end - |
1071 | (void *)is->s.base, 0); | |
1072 | if (error && error != -ENODATA) | |
1073 | return error; | |
1074 | is->s.not_found = error; | |
1075 | } | |
1076 | return 0; | |
1077 | } | |
1078 | ||
0d812f77 TM |
1079 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
1080 | struct ext4_xattr_info *i, | |
1081 | struct ext4_xattr_ibody_find *is) | |
1082 | { | |
1083 | struct ext4_xattr_ibody_header *header; | |
1084 | struct ext4_xattr_search *s = &is->s; | |
1085 | int error; | |
1086 | ||
1087 | if (EXT4_I(inode)->i_extra_isize == 0) | |
1088 | return -ENOSPC; | |
1089 | error = ext4_xattr_set_entry(i, s); | |
1090 | if (error) { | |
1091 | if (error == -ENOSPC && | |
1092 | ext4_has_inline_data(inode)) { | |
1093 | error = ext4_try_to_evict_inline_data(handle, inode, | |
1094 | EXT4_XATTR_LEN(strlen(i->name) + | |
1095 | EXT4_XATTR_SIZE(i->value_len))); | |
1096 | if (error) | |
1097 | return error; | |
1098 | error = ext4_xattr_ibody_find(inode, i, is); | |
1099 | if (error) | |
1100 | return error; | |
1101 | error = ext4_xattr_set_entry(i, s); | |
1102 | } | |
1103 | if (error) | |
1104 | return error; | |
1105 | } | |
1106 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); | |
1107 | if (!IS_LAST_ENTRY(s->first)) { | |
1108 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
1109 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
1110 | } else { | |
1111 | header->h_magic = cpu_to_le32(0); | |
1112 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
1113 | } | |
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, | |
1118 | struct ext4_xattr_info *i, | |
1119 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 1120 | { |
617ba13b MC |
1121 | struct ext4_xattr_ibody_header *header; |
1122 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
1123 | int error; |
1124 | ||
617ba13b | 1125 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1126 | return -ENOSPC; |
617ba13b | 1127 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
1128 | if (error) |
1129 | return error; | |
617ba13b | 1130 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 1131 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 1132 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 1133 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1134 | } else { |
1135 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 1136 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1137 | } |
1138 | return 0; | |
1139 | } | |
1140 | ||
3fd16462 JK |
1141 | static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
1142 | struct ext4_xattr_info *i) | |
1143 | { | |
1144 | void *value; | |
1145 | ||
1146 | if (le32_to_cpu(s->here->e_value_size) != i->value_len) | |
1147 | return 0; | |
1148 | value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); | |
1149 | return !memcmp(value, i->value, i->value_len); | |
1150 | } | |
1151 | ||
ac27a0ec | 1152 | /* |
617ba13b | 1153 | * ext4_xattr_set_handle() |
ac27a0ec | 1154 | * |
6e9510b0 | 1155 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
1156 | * is NULL to remove an existing extended attribute, and non-NULL to |
1157 | * either replace an existing extended attribute, or create a new extended | |
1158 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
1159 | * specify that an extended attribute must exist and must not exist | |
1160 | * previous to the call, respectively. | |
1161 | * | |
1162 | * Returns 0, or a negative error number on failure. | |
1163 | */ | |
1164 | int | |
617ba13b | 1165 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
1166 | const char *name, const void *value, size_t value_len, |
1167 | int flags) | |
1168 | { | |
617ba13b | 1169 | struct ext4_xattr_info i = { |
ac27a0ec DK |
1170 | .name_index = name_index, |
1171 | .name = name, | |
1172 | .value = value, | |
1173 | .value_len = value_len, | |
1174 | ||
1175 | }; | |
617ba13b | 1176 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
1177 | .s = { .not_found = -ENODATA, }, |
1178 | }; | |
617ba13b | 1179 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
1180 | .s = { .not_found = -ENODATA, }, |
1181 | }; | |
4d20c685 | 1182 | unsigned long no_expand; |
ac27a0ec DK |
1183 | int error; |
1184 | ||
1185 | if (!name) | |
1186 | return -EINVAL; | |
1187 | if (strlen(name) > 255) | |
1188 | return -ERANGE; | |
617ba13b | 1189 | down_write(&EXT4_I(inode)->xattr_sem); |
19f5fb7a TT |
1190 | no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); |
1191 | ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); | |
4d20c685 | 1192 | |
66543617 | 1193 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
1194 | if (error) |
1195 | goto cleanup; | |
1196 | ||
19f5fb7a | 1197 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
1198 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
1199 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 1200 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
1201 | } |
1202 | ||
617ba13b | 1203 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
1204 | if (error) |
1205 | goto cleanup; | |
1206 | if (is.s.not_found) | |
617ba13b | 1207 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
1208 | if (error) |
1209 | goto cleanup; | |
1210 | if (is.s.not_found && bs.s.not_found) { | |
1211 | error = -ENODATA; | |
1212 | if (flags & XATTR_REPLACE) | |
1213 | goto cleanup; | |
1214 | error = 0; | |
1215 | if (!value) | |
1216 | goto cleanup; | |
1217 | } else { | |
1218 | error = -EEXIST; | |
1219 | if (flags & XATTR_CREATE) | |
1220 | goto cleanup; | |
1221 | } | |
ac27a0ec DK |
1222 | if (!value) { |
1223 | if (!is.s.not_found) | |
617ba13b | 1224 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 1225 | else if (!bs.s.not_found) |
617ba13b | 1226 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1227 | } else { |
3fd16462 JK |
1228 | error = 0; |
1229 | /* Xattr value did not change? Save us some work and bail out */ | |
1230 | if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) | |
1231 | goto cleanup; | |
1232 | if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) | |
1233 | goto cleanup; | |
1234 | ||
617ba13b | 1235 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
1236 | if (!error && !bs.s.not_found) { |
1237 | i.value = NULL; | |
617ba13b | 1238 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1239 | } else if (error == -ENOSPC) { |
7e01c8e5 TY |
1240 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
1241 | error = ext4_xattr_block_find(inode, &i, &bs); | |
1242 | if (error) | |
1243 | goto cleanup; | |
1244 | } | |
617ba13b | 1245 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec DK |
1246 | if (error) |
1247 | goto cleanup; | |
1248 | if (!is.s.not_found) { | |
1249 | i.value = NULL; | |
617ba13b | 1250 | error = ext4_xattr_ibody_set(handle, inode, &i, |
ac27a0ec DK |
1251 | &is); |
1252 | } | |
1253 | } | |
1254 | } | |
1255 | if (!error) { | |
617ba13b | 1256 | ext4_xattr_update_super_block(handle, inode->i_sb); |
ef7f3835 | 1257 | inode->i_ctime = ext4_current_time(inode); |
6dd4ee7c | 1258 | if (!value) |
19f5fb7a | 1259 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
617ba13b | 1260 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 1261 | /* |
617ba13b | 1262 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
1263 | * error != 0. |
1264 | */ | |
1265 | is.iloc.bh = NULL; | |
1266 | if (IS_SYNC(inode)) | |
0390131b | 1267 | ext4_handle_sync(handle); |
ac27a0ec DK |
1268 | } |
1269 | ||
1270 | cleanup: | |
1271 | brelse(is.iloc.bh); | |
1272 | brelse(bs.bh); | |
4d20c685 | 1273 | if (no_expand == 0) |
19f5fb7a | 1274 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
617ba13b | 1275 | up_write(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
1276 | return error; |
1277 | } | |
1278 | ||
1279 | /* | |
617ba13b | 1280 | * ext4_xattr_set() |
ac27a0ec | 1281 | * |
617ba13b | 1282 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
1283 | * attribute modification is a filesystem transaction by itself. |
1284 | * | |
1285 | * Returns 0, or a negative error number on failure. | |
1286 | */ | |
1287 | int | |
617ba13b | 1288 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
1289 | const void *value, size_t value_len, int flags) |
1290 | { | |
1291 | handle_t *handle; | |
1292 | int error, retries = 0; | |
95eaefbd | 1293 | int credits = ext4_jbd2_credits_xattr(inode); |
ac27a0ec DK |
1294 | |
1295 | retry: | |
9924a92a | 1296 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
1297 | if (IS_ERR(handle)) { |
1298 | error = PTR_ERR(handle); | |
1299 | } else { | |
1300 | int error2; | |
1301 | ||
617ba13b | 1302 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 1303 | value, value_len, flags); |
617ba13b | 1304 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 1305 | if (error == -ENOSPC && |
617ba13b | 1306 | ext4_should_retry_alloc(inode->i_sb, &retries)) |
ac27a0ec DK |
1307 | goto retry; |
1308 | if (error == 0) | |
1309 | error = error2; | |
1310 | } | |
1311 | ||
1312 | return error; | |
1313 | } | |
1314 | ||
6dd4ee7c KS |
1315 | /* |
1316 | * Shift the EA entries in the inode to create space for the increased | |
1317 | * i_extra_isize. | |
1318 | */ | |
1319 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
1320 | int value_offs_shift, void *to, | |
1321 | void *from, size_t n, int blocksize) | |
1322 | { | |
1323 | struct ext4_xattr_entry *last = entry; | |
1324 | int new_offs; | |
1325 | ||
1326 | /* Adjust the value offsets of the entries */ | |
1327 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1328 | if (!last->e_value_block && last->e_value_size) { | |
1329 | new_offs = le16_to_cpu(last->e_value_offs) + | |
1330 | value_offs_shift; | |
1331 | BUG_ON(new_offs + le32_to_cpu(last->e_value_size) | |
1332 | > blocksize); | |
1333 | last->e_value_offs = cpu_to_le16(new_offs); | |
1334 | } | |
1335 | } | |
1336 | /* Shift the entries by n bytes */ | |
1337 | memmove(to, from, n); | |
1338 | } | |
1339 | ||
1340 | /* | |
1341 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
1342 | * Returns 0 on success or negative error number on failure. | |
1343 | */ | |
1344 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
1345 | struct ext4_inode *raw_inode, handle_t *handle) | |
1346 | { | |
1347 | struct ext4_xattr_ibody_header *header; | |
1348 | struct ext4_xattr_entry *entry, *last, *first; | |
1349 | struct buffer_head *bh = NULL; | |
1350 | struct ext4_xattr_ibody_find *is = NULL; | |
1351 | struct ext4_xattr_block_find *bs = NULL; | |
1352 | char *buffer = NULL, *b_entry_name = NULL; | |
1353 | size_t min_offs, free; | |
7b1b2c1b | 1354 | int total_ino; |
6dd4ee7c KS |
1355 | void *base, *start, *end; |
1356 | int extra_isize = 0, error = 0, tried_min_extra_isize = 0; | |
ac39849d | 1357 | int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); |
6dd4ee7c KS |
1358 | |
1359 | down_write(&EXT4_I(inode)->xattr_sem); | |
1360 | retry: | |
1361 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { | |
1362 | up_write(&EXT4_I(inode)->xattr_sem); | |
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | header = IHDR(inode, raw_inode); | |
1367 | entry = IFIRST(header); | |
1368 | ||
1369 | /* | |
1370 | * Check if enough free space is available in the inode to shift the | |
1371 | * entries ahead by new_extra_isize. | |
1372 | */ | |
1373 | ||
1374 | base = start = entry; | |
1375 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
1376 | min_offs = end - base; | |
1377 | last = entry; | |
1378 | total_ino = sizeof(struct ext4_xattr_ibody_header); | |
1379 | ||
9e92f48c TT |
1380 | error = xattr_check_inode(inode, header, end); |
1381 | if (error) | |
1382 | goto cleanup; | |
1383 | ||
6dd4ee7c KS |
1384 | free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); |
1385 | if (free >= new_extra_isize) { | |
1386 | entry = IFIRST(header); | |
1387 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize | |
1388 | - new_extra_isize, (void *)raw_inode + | |
1389 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
1390 | (void *)header, total_ino, | |
1391 | inode->i_sb->s_blocksize); | |
1392 | EXT4_I(inode)->i_extra_isize = new_extra_isize; | |
1393 | error = 0; | |
1394 | goto cleanup; | |
1395 | } | |
1396 | ||
1397 | /* | |
1398 | * Enough free space isn't available in the inode, check if | |
1399 | * EA block can hold new_extra_isize bytes. | |
1400 | */ | |
1401 | if (EXT4_I(inode)->i_file_acl) { | |
1402 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
1403 | error = -EIO; | |
1404 | if (!bh) | |
1405 | goto cleanup; | |
cc8e94fd | 1406 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
1407 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1408 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 1409 | error = -EFSCORRUPTED; |
6dd4ee7c KS |
1410 | goto cleanup; |
1411 | } | |
1412 | base = BHDR(bh); | |
1413 | first = BFIRST(bh); | |
1414 | end = bh->b_data + bh->b_size; | |
1415 | min_offs = end - base; | |
7b1b2c1b | 1416 | free = ext4_xattr_free_space(first, &min_offs, base, NULL); |
6dd4ee7c KS |
1417 | if (free < new_extra_isize) { |
1418 | if (!tried_min_extra_isize && s_min_extra_isize) { | |
1419 | tried_min_extra_isize++; | |
1420 | new_extra_isize = s_min_extra_isize; | |
1421 | brelse(bh); | |
1422 | goto retry; | |
1423 | } | |
1424 | error = -1; | |
1425 | goto cleanup; | |
1426 | } | |
1427 | } else { | |
1428 | free = inode->i_sb->s_blocksize; | |
1429 | } | |
1430 | ||
1431 | while (new_extra_isize > 0) { | |
1432 | size_t offs, size, entry_size; | |
1433 | struct ext4_xattr_entry *small_entry = NULL; | |
1434 | struct ext4_xattr_info i = { | |
1435 | .value = NULL, | |
1436 | .value_len = 0, | |
1437 | }; | |
1438 | unsigned int total_size; /* EA entry size + value size */ | |
1439 | unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ | |
1440 | unsigned int min_total_size = ~0U; | |
1441 | ||
1442 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); | |
1443 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
1444 | if (!is || !bs) { | |
1445 | error = -ENOMEM; | |
1446 | goto cleanup; | |
1447 | } | |
1448 | ||
1449 | is->s.not_found = -ENODATA; | |
1450 | bs->s.not_found = -ENODATA; | |
1451 | is->iloc.bh = NULL; | |
1452 | bs->bh = NULL; | |
1453 | ||
1454 | last = IFIRST(header); | |
1455 | /* Find the entry best suited to be pushed into EA block */ | |
1456 | entry = NULL; | |
1457 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1458 | total_size = | |
1459 | EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + | |
1460 | EXT4_XATTR_LEN(last->e_name_len); | |
1461 | if (total_size <= free && total_size < min_total_size) { | |
1462 | if (total_size < new_extra_isize) { | |
1463 | small_entry = last; | |
1464 | } else { | |
1465 | entry = last; | |
1466 | min_total_size = total_size; | |
1467 | } | |
1468 | } | |
1469 | } | |
1470 | ||
1471 | if (entry == NULL) { | |
1472 | if (small_entry) { | |
1473 | entry = small_entry; | |
1474 | } else { | |
1475 | if (!tried_min_extra_isize && | |
1476 | s_min_extra_isize) { | |
1477 | tried_min_extra_isize++; | |
1478 | new_extra_isize = s_min_extra_isize; | |
6e4ea8e3 DJ |
1479 | kfree(is); is = NULL; |
1480 | kfree(bs); bs = NULL; | |
dcb9917b | 1481 | brelse(bh); |
6dd4ee7c KS |
1482 | goto retry; |
1483 | } | |
1484 | error = -1; | |
1485 | goto cleanup; | |
1486 | } | |
1487 | } | |
1488 | offs = le16_to_cpu(entry->e_value_offs); | |
1489 | size = le32_to_cpu(entry->e_value_size); | |
1490 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
1491 | i.name_index = entry->e_name_index, | |
1492 | buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); | |
1493 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
1494 | if (!buffer || !b_entry_name) { | |
1495 | error = -ENOMEM; | |
1496 | goto cleanup; | |
1497 | } | |
1498 | /* Save the entry name and the entry value */ | |
1499 | memcpy(buffer, (void *)IFIRST(header) + offs, | |
1500 | EXT4_XATTR_SIZE(size)); | |
1501 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); | |
1502 | b_entry_name[entry->e_name_len] = '\0'; | |
1503 | i.name = b_entry_name; | |
1504 | ||
1505 | error = ext4_get_inode_loc(inode, &is->iloc); | |
1506 | if (error) | |
1507 | goto cleanup; | |
1508 | ||
1509 | error = ext4_xattr_ibody_find(inode, &i, is); | |
1510 | if (error) | |
1511 | goto cleanup; | |
1512 | ||
1513 | /* Remove the chosen entry from the inode */ | |
1514 | error = ext4_xattr_ibody_set(handle, inode, &i, is); | |
9aaab058 RK |
1515 | if (error) |
1516 | goto cleanup; | |
6dd4ee7c KS |
1517 | |
1518 | entry = IFIRST(header); | |
1519 | if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) | |
1520 | shift_bytes = new_extra_isize; | |
1521 | else | |
1522 | shift_bytes = entry_size + size; | |
1523 | /* Adjust the offsets and shift the remaining entries ahead */ | |
1524 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - | |
1525 | shift_bytes, (void *)raw_inode + | |
1526 | EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, | |
1527 | (void *)header, total_ino - entry_size, | |
1528 | inode->i_sb->s_blocksize); | |
1529 | ||
1530 | extra_isize += shift_bytes; | |
1531 | new_extra_isize -= shift_bytes; | |
1532 | EXT4_I(inode)->i_extra_isize = extra_isize; | |
1533 | ||
1534 | i.name = b_entry_name; | |
1535 | i.value = buffer; | |
ac39849d | 1536 | i.value_len = size; |
6dd4ee7c KS |
1537 | error = ext4_xattr_block_find(inode, &i, bs); |
1538 | if (error) | |
1539 | goto cleanup; | |
1540 | ||
1541 | /* Add entry which was removed from the inode into the block */ | |
1542 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
1543 | if (error) | |
1544 | goto cleanup; | |
1545 | kfree(b_entry_name); | |
1546 | kfree(buffer); | |
d3533d72 JL |
1547 | b_entry_name = NULL; |
1548 | buffer = NULL; | |
6dd4ee7c KS |
1549 | brelse(is->iloc.bh); |
1550 | kfree(is); | |
1551 | kfree(bs); | |
1552 | } | |
1553 | brelse(bh); | |
1554 | up_write(&EXT4_I(inode)->xattr_sem); | |
1555 | return 0; | |
1556 | ||
1557 | cleanup: | |
1558 | kfree(b_entry_name); | |
1559 | kfree(buffer); | |
1560 | if (is) | |
1561 | brelse(is->iloc.bh); | |
1562 | kfree(is); | |
1563 | kfree(bs); | |
1564 | brelse(bh); | |
1565 | up_write(&EXT4_I(inode)->xattr_sem); | |
1566 | return error; | |
1567 | } | |
1568 | ||
1569 | ||
1570 | ||
ac27a0ec | 1571 | /* |
617ba13b | 1572 | * ext4_xattr_delete_inode() |
ac27a0ec DK |
1573 | * |
1574 | * Free extended attribute resources associated with this inode. This | |
1575 | * is called immediately before an inode is freed. We have exclusive | |
1576 | * access to the inode. | |
1577 | */ | |
1578 | void | |
617ba13b | 1579 | ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
1580 | { |
1581 | struct buffer_head *bh = NULL; | |
1582 | ||
617ba13b | 1583 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 1584 | goto cleanup; |
617ba13b | 1585 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec | 1586 | if (!bh) { |
24676da4 TT |
1587 | EXT4_ERROR_INODE(inode, "block %llu read error", |
1588 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1589 | goto cleanup; |
1590 | } | |
617ba13b | 1591 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 1592 | BHDR(bh)->h_blocks != cpu_to_le32(1)) { |
24676da4 TT |
1593 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1594 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1595 | goto cleanup; |
1596 | } | |
617ba13b MC |
1597 | ext4_xattr_release_block(handle, inode, bh); |
1598 | EXT4_I(inode)->i_file_acl = 0; | |
ac27a0ec DK |
1599 | |
1600 | cleanup: | |
1601 | brelse(bh); | |
1602 | } | |
1603 | ||
ac27a0ec | 1604 | /* |
617ba13b | 1605 | * ext4_xattr_cache_insert() |
ac27a0ec DK |
1606 | * |
1607 | * Create a new entry in the extended attribute cache, and insert | |
1608 | * it unless such an entry is already in the cache. | |
1609 | * | |
1610 | * Returns 0, or a negative error number on failure. | |
1611 | */ | |
1612 | static void | |
7a2508e1 | 1613 | ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) |
ac27a0ec | 1614 | { |
6048c64b AG |
1615 | struct ext4_xattr_header *header = BHDR(bh); |
1616 | __u32 hash = le32_to_cpu(header->h_hash); | |
1617 | int reusable = le32_to_cpu(header->h_refcount) < | |
1618 | EXT4_XATTR_REFCOUNT_MAX; | |
ac27a0ec DK |
1619 | int error; |
1620 | ||
7a2508e1 | 1621 | error = mb_cache_entry_create(ext4_mb_cache, GFP_NOFS, hash, |
6048c64b | 1622 | bh->b_blocknr, reusable); |
ac27a0ec | 1623 | if (error) { |
82939d79 | 1624 | if (error == -EBUSY) |
ac27a0ec | 1625 | ea_bdebug(bh, "already in cache"); |
82939d79 | 1626 | } else |
ac27a0ec | 1627 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
1628 | } |
1629 | ||
1630 | /* | |
617ba13b | 1631 | * ext4_xattr_cmp() |
ac27a0ec DK |
1632 | * |
1633 | * Compare two extended attribute blocks for equality. | |
1634 | * | |
1635 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
1636 | * a negative error number on errors. | |
1637 | */ | |
1638 | static int | |
617ba13b MC |
1639 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
1640 | struct ext4_xattr_header *header2) | |
ac27a0ec | 1641 | { |
617ba13b | 1642 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
1643 | |
1644 | entry1 = ENTRY(header1+1); | |
1645 | entry2 = ENTRY(header2+1); | |
1646 | while (!IS_LAST_ENTRY(entry1)) { | |
1647 | if (IS_LAST_ENTRY(entry2)) | |
1648 | return 1; | |
1649 | if (entry1->e_hash != entry2->e_hash || | |
1650 | entry1->e_name_index != entry2->e_name_index || | |
1651 | entry1->e_name_len != entry2->e_name_len || | |
1652 | entry1->e_value_size != entry2->e_value_size || | |
1653 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) | |
1654 | return 1; | |
1655 | if (entry1->e_value_block != 0 || entry2->e_value_block != 0) | |
6a797d27 | 1656 | return -EFSCORRUPTED; |
ac27a0ec DK |
1657 | if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), |
1658 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), | |
1659 | le32_to_cpu(entry1->e_value_size))) | |
1660 | return 1; | |
1661 | ||
617ba13b MC |
1662 | entry1 = EXT4_XATTR_NEXT(entry1); |
1663 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
1664 | } |
1665 | if (!IS_LAST_ENTRY(entry2)) | |
1666 | return 1; | |
1667 | return 0; | |
1668 | } | |
1669 | ||
1670 | /* | |
617ba13b | 1671 | * ext4_xattr_cache_find() |
ac27a0ec DK |
1672 | * |
1673 | * Find an identical extended attribute block. | |
1674 | * | |
1675 | * Returns a pointer to the block found, or NULL if such a block was | |
1676 | * not found or an error occurred. | |
1677 | */ | |
1678 | static struct buffer_head * | |
617ba13b | 1679 | ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, |
7a2508e1 | 1680 | struct mb_cache_entry **pce) |
ac27a0ec DK |
1681 | { |
1682 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 JK |
1683 | struct mb_cache_entry *ce; |
1684 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); | |
ac27a0ec DK |
1685 | |
1686 | if (!header->h_hash) | |
1687 | return NULL; /* never share */ | |
1688 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
7a2508e1 | 1689 | ce = mb_cache_entry_find_first(ext4_mb_cache, hash); |
ac27a0ec DK |
1690 | while (ce) { |
1691 | struct buffer_head *bh; | |
1692 | ||
ac27a0ec DK |
1693 | bh = sb_bread(inode->i_sb, ce->e_block); |
1694 | if (!bh) { | |
24676da4 TT |
1695 | EXT4_ERROR_INODE(inode, "block %lu read error", |
1696 | (unsigned long) ce->e_block); | |
617ba13b | 1697 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
ac27a0ec DK |
1698 | *pce = ce; |
1699 | return bh; | |
1700 | } | |
1701 | brelse(bh); | |
7a2508e1 | 1702 | ce = mb_cache_entry_find_next(ext4_mb_cache, ce); |
ac27a0ec DK |
1703 | } |
1704 | return NULL; | |
1705 | } | |
1706 | ||
1707 | #define NAME_HASH_SHIFT 5 | |
1708 | #define VALUE_HASH_SHIFT 16 | |
1709 | ||
1710 | /* | |
617ba13b | 1711 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
1712 | * |
1713 | * Compute the hash of an extended attribute. | |
1714 | */ | |
617ba13b MC |
1715 | static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, |
1716 | struct ext4_xattr_entry *entry) | |
ac27a0ec DK |
1717 | { |
1718 | __u32 hash = 0; | |
1719 | char *name = entry->e_name; | |
1720 | int n; | |
1721 | ||
2b2d6d01 | 1722 | for (n = 0; n < entry->e_name_len; n++) { |
ac27a0ec DK |
1723 | hash = (hash << NAME_HASH_SHIFT) ^ |
1724 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
1725 | *name++; | |
1726 | } | |
1727 | ||
1728 | if (entry->e_value_block == 0 && entry->e_value_size != 0) { | |
1729 | __le32 *value = (__le32 *)((char *)header + | |
1730 | le16_to_cpu(entry->e_value_offs)); | |
1731 | for (n = (le32_to_cpu(entry->e_value_size) + | |
617ba13b | 1732 | EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { |
ac27a0ec DK |
1733 | hash = (hash << VALUE_HASH_SHIFT) ^ |
1734 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
1735 | le32_to_cpu(*value++); | |
1736 | } | |
1737 | } | |
1738 | entry->e_hash = cpu_to_le32(hash); | |
1739 | } | |
1740 | ||
1741 | #undef NAME_HASH_SHIFT | |
1742 | #undef VALUE_HASH_SHIFT | |
1743 | ||
1744 | #define BLOCK_HASH_SHIFT 16 | |
1745 | ||
1746 | /* | |
617ba13b | 1747 | * ext4_xattr_rehash() |
ac27a0ec DK |
1748 | * |
1749 | * Re-compute the extended attribute hash value after an entry has changed. | |
1750 | */ | |
617ba13b MC |
1751 | static void ext4_xattr_rehash(struct ext4_xattr_header *header, |
1752 | struct ext4_xattr_entry *entry) | |
ac27a0ec | 1753 | { |
617ba13b | 1754 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
1755 | __u32 hash = 0; |
1756 | ||
617ba13b | 1757 | ext4_xattr_hash_entry(header, entry); |
ac27a0ec DK |
1758 | here = ENTRY(header+1); |
1759 | while (!IS_LAST_ENTRY(here)) { | |
1760 | if (!here->e_hash) { | |
1761 | /* Block is not shared if an entry's hash value == 0 */ | |
1762 | hash = 0; | |
1763 | break; | |
1764 | } | |
1765 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
1766 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
1767 | le32_to_cpu(here->e_hash); | |
617ba13b | 1768 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
1769 | } |
1770 | header->h_hash = cpu_to_le32(hash); | |
1771 | } | |
1772 | ||
1773 | #undef BLOCK_HASH_SHIFT | |
1774 | ||
9c191f70 M |
1775 | #define HASH_BUCKET_BITS 10 |
1776 | ||
7a2508e1 | 1777 | struct mb_cache * |
82939d79 | 1778 | ext4_xattr_create_cache(void) |
ac27a0ec | 1779 | { |
7a2508e1 | 1780 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
1781 | } |
1782 | ||
7a2508e1 | 1783 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 1784 | { |
9c191f70 | 1785 | if (cache) |
7a2508e1 | 1786 | mb_cache_destroy(cache); |
ac27a0ec | 1787 | } |
9c191f70 | 1788 |