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> | |
ac27a0ec DK |
56 | #include <linux/mbcache.h> |
57 | #include <linux/quotaops.h> | |
58 | #include <linux/rwsem.h> | |
3dcf5451 CH |
59 | #include "ext4_jbd2.h" |
60 | #include "ext4.h" | |
ac27a0ec DK |
61 | #include "xattr.h" |
62 | #include "acl.h" | |
63 | ||
617ba13b | 64 | #ifdef EXT4_XATTR_DEBUG |
ac27a0ec DK |
65 | # define ea_idebug(inode, f...) do { \ |
66 | printk(KERN_DEBUG "inode %s:%lu: ", \ | |
67 | inode->i_sb->s_id, inode->i_ino); \ | |
68 | printk(f); \ | |
69 | printk("\n"); \ | |
70 | } while (0) | |
71 | # define ea_bdebug(bh, f...) do { \ | |
72 | char b[BDEVNAME_SIZE]; \ | |
73 | printk(KERN_DEBUG "block %s:%lu: ", \ | |
74 | bdevname(bh->b_bdev, b), \ | |
75 | (unsigned long) bh->b_blocknr); \ | |
76 | printk(f); \ | |
77 | printk("\n"); \ | |
78 | } while (0) | |
79 | #else | |
ace36ad4 JP |
80 | # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
81 | # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) | |
ac27a0ec DK |
82 | #endif |
83 | ||
9c191f70 | 84 | static void ext4_xattr_cache_insert(struct mb_cache *, struct buffer_head *); |
617ba13b MC |
85 | static struct buffer_head *ext4_xattr_cache_find(struct inode *, |
86 | struct ext4_xattr_header *, | |
ac27a0ec | 87 | struct mb_cache_entry **); |
617ba13b MC |
88 | static void ext4_xattr_rehash(struct ext4_xattr_header *, |
89 | struct ext4_xattr_entry *); | |
431547b3 | 90 | static int ext4_xattr_list(struct dentry *dentry, char *buffer, |
d3a95d47 | 91 | size_t buffer_size); |
ac27a0ec | 92 | |
11e27528 | 93 | static const struct xattr_handler *ext4_xattr_handler_map[] = { |
617ba13b | 94 | [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, |
03010a33 | 95 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
96 | [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
97 | [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, | |
ac27a0ec | 98 | #endif |
617ba13b | 99 | [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, |
03010a33 | 100 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 101 | [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, |
ac27a0ec DK |
102 | #endif |
103 | }; | |
104 | ||
11e27528 | 105 | const struct xattr_handler *ext4_xattr_handlers[] = { |
617ba13b MC |
106 | &ext4_xattr_user_handler, |
107 | &ext4_xattr_trusted_handler, | |
03010a33 | 108 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
109 | &posix_acl_access_xattr_handler, |
110 | &posix_acl_default_xattr_handler, | |
ac27a0ec | 111 | #endif |
03010a33 | 112 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 113 | &ext4_xattr_security_handler, |
ac27a0ec DK |
114 | #endif |
115 | NULL | |
116 | }; | |
117 | ||
9c191f70 M |
118 | #define EXT4_GET_MB_CACHE(inode) (((struct ext4_sb_info *) \ |
119 | inode->i_sb->s_fs_info)->s_mb_cache) | |
120 | ||
cc8e94fd DW |
121 | static __le32 ext4_xattr_block_csum(struct inode *inode, |
122 | sector_t block_nr, | |
123 | struct ext4_xattr_header *hdr) | |
124 | { | |
125 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
d6a77105 TT |
126 | __u32 csum; |
127 | __le32 save_csum; | |
128 | __le64 dsk_block_nr = cpu_to_le64(block_nr); | |
cc8e94fd | 129 | |
d6a77105 | 130 | save_csum = hdr->h_checksum; |
cc8e94fd | 131 | hdr->h_checksum = 0; |
d6a77105 TT |
132 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, |
133 | sizeof(dsk_block_nr)); | |
cc8e94fd DW |
134 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr, |
135 | EXT4_BLOCK_SIZE(inode->i_sb)); | |
41eb70dd | 136 | |
d6a77105 | 137 | hdr->h_checksum = save_csum; |
cc8e94fd DW |
138 | return cpu_to_le32(csum); |
139 | } | |
140 | ||
141 | static int ext4_xattr_block_csum_verify(struct inode *inode, | |
142 | sector_t block_nr, | |
143 | struct ext4_xattr_header *hdr) | |
144 | { | |
9aa5d32b | 145 | if (ext4_has_metadata_csum(inode->i_sb) && |
cc8e94fd DW |
146 | (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr))) |
147 | return 0; | |
148 | return 1; | |
149 | } | |
150 | ||
151 | static void ext4_xattr_block_csum_set(struct inode *inode, | |
152 | sector_t block_nr, | |
153 | struct ext4_xattr_header *hdr) | |
154 | { | |
9aa5d32b | 155 | if (!ext4_has_metadata_csum(inode->i_sb)) |
cc8e94fd DW |
156 | return; |
157 | ||
158 | hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr); | |
159 | } | |
160 | ||
161 | static inline int ext4_handle_dirty_xattr_block(handle_t *handle, | |
162 | struct inode *inode, | |
163 | struct buffer_head *bh) | |
164 | { | |
165 | ext4_xattr_block_csum_set(inode, bh->b_blocknr, BHDR(bh)); | |
166 | return ext4_handle_dirty_metadata(handle, inode, bh); | |
167 | } | |
168 | ||
11e27528 | 169 | static inline const struct xattr_handler * |
617ba13b | 170 | ext4_xattr_handler(int name_index) |
ac27a0ec | 171 | { |
11e27528 | 172 | const struct xattr_handler *handler = NULL; |
ac27a0ec | 173 | |
617ba13b MC |
174 | if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
175 | handler = ext4_xattr_handler_map[name_index]; | |
ac27a0ec DK |
176 | return handler; |
177 | } | |
178 | ||
179 | /* | |
180 | * Inode operation listxattr() | |
181 | * | |
182 | * dentry->d_inode->i_mutex: don't care | |
183 | */ | |
184 | ssize_t | |
617ba13b | 185 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) |
ac27a0ec | 186 | { |
431547b3 | 187 | return ext4_xattr_list(dentry, buffer, size); |
ac27a0ec DK |
188 | } |
189 | ||
190 | static int | |
a0626e75 DW |
191 | ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end, |
192 | void *value_start) | |
ac27a0ec | 193 | { |
a0626e75 DW |
194 | struct ext4_xattr_entry *e = entry; |
195 | ||
196 | while (!IS_LAST_ENTRY(e)) { | |
197 | struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); | |
ac27a0ec DK |
198 | if ((void *)next >= end) |
199 | return -EIO; | |
a0626e75 | 200 | e = next; |
ac27a0ec | 201 | } |
a0626e75 DW |
202 | |
203 | while (!IS_LAST_ENTRY(entry)) { | |
204 | if (entry->e_value_size != 0 && | |
205 | (value_start + le16_to_cpu(entry->e_value_offs) < | |
206 | (void *)e + sizeof(__u32) || | |
207 | value_start + le16_to_cpu(entry->e_value_offs) + | |
208 | le32_to_cpu(entry->e_value_size) > end)) | |
209 | return -EIO; | |
210 | entry = EXT4_XATTR_NEXT(entry); | |
211 | } | |
212 | ||
ac27a0ec DK |
213 | return 0; |
214 | } | |
215 | ||
216 | static inline int | |
cc8e94fd | 217 | ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) |
ac27a0ec | 218 | { |
cc8e94fd DW |
219 | int error; |
220 | ||
221 | if (buffer_verified(bh)) | |
222 | return 0; | |
223 | ||
617ba13b | 224 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec DK |
225 | BHDR(bh)->h_blocks != cpu_to_le32(1)) |
226 | return -EIO; | |
cc8e94fd DW |
227 | if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh))) |
228 | return -EIO; | |
a0626e75 DW |
229 | error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size, |
230 | bh->b_data); | |
cc8e94fd DW |
231 | if (!error) |
232 | set_buffer_verified(bh); | |
233 | return error; | |
ac27a0ec DK |
234 | } |
235 | ||
236 | static inline int | |
617ba13b | 237 | ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) |
ac27a0ec DK |
238 | { |
239 | size_t value_size = le32_to_cpu(entry->e_value_size); | |
240 | ||
241 | if (entry->e_value_block != 0 || value_size > size || | |
242 | le16_to_cpu(entry->e_value_offs) + value_size > size) | |
243 | return -EIO; | |
244 | return 0; | |
245 | } | |
246 | ||
247 | static int | |
617ba13b | 248 | ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, |
ac27a0ec DK |
249 | const char *name, size_t size, int sorted) |
250 | { | |
617ba13b | 251 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
252 | size_t name_len; |
253 | int cmp = 1; | |
254 | ||
255 | if (name == NULL) | |
256 | return -EINVAL; | |
257 | name_len = strlen(name); | |
258 | entry = *pentry; | |
617ba13b | 259 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
ac27a0ec DK |
260 | cmp = name_index - entry->e_name_index; |
261 | if (!cmp) | |
262 | cmp = name_len - entry->e_name_len; | |
263 | if (!cmp) | |
264 | cmp = memcmp(name, entry->e_name, name_len); | |
265 | if (cmp <= 0 && (sorted || cmp == 0)) | |
266 | break; | |
267 | } | |
268 | *pentry = entry; | |
617ba13b | 269 | if (!cmp && ext4_xattr_check_entry(entry, size)) |
ac27a0ec DK |
270 | return -EIO; |
271 | return cmp ? -ENODATA : 0; | |
272 | } | |
273 | ||
274 | static int | |
617ba13b | 275 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
276 | void *buffer, size_t buffer_size) |
277 | { | |
278 | struct buffer_head *bh = NULL; | |
617ba13b | 279 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
280 | size_t size; |
281 | int error; | |
9c191f70 | 282 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
283 | |
284 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
285 | name_index, name, buffer, (long)buffer_size); | |
286 | ||
287 | error = -ENODATA; | |
617ba13b | 288 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 289 | goto cleanup; |
ace36ad4 JP |
290 | ea_idebug(inode, "reading block %llu", |
291 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 292 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
293 | if (!bh) |
294 | goto cleanup; | |
295 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
296 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 297 | if (ext4_xattr_check_block(inode, bh)) { |
12062ddd | 298 | bad_block: |
24676da4 TT |
299 | EXT4_ERROR_INODE(inode, "bad block %llu", |
300 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
301 | error = -EIO; |
302 | goto cleanup; | |
303 | } | |
9c191f70 | 304 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
ac27a0ec | 305 | entry = BFIRST(bh); |
617ba13b | 306 | error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); |
ac27a0ec DK |
307 | if (error == -EIO) |
308 | goto bad_block; | |
309 | if (error) | |
310 | goto cleanup; | |
311 | size = le32_to_cpu(entry->e_value_size); | |
312 | if (buffer) { | |
313 | error = -ERANGE; | |
314 | if (size > buffer_size) | |
315 | goto cleanup; | |
316 | memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), | |
317 | size); | |
318 | } | |
319 | error = size; | |
320 | ||
321 | cleanup: | |
322 | brelse(bh); | |
323 | return error; | |
324 | } | |
325 | ||
879b3825 | 326 | int |
617ba13b | 327 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
328 | void *buffer, size_t buffer_size) |
329 | { | |
617ba13b MC |
330 | struct ext4_xattr_ibody_header *header; |
331 | struct ext4_xattr_entry *entry; | |
332 | struct ext4_inode *raw_inode; | |
333 | struct ext4_iloc iloc; | |
ac27a0ec DK |
334 | size_t size; |
335 | void *end; | |
336 | int error; | |
337 | ||
19f5fb7a | 338 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 339 | return -ENODATA; |
617ba13b | 340 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
341 | if (error) |
342 | return error; | |
617ba13b | 343 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec DK |
344 | header = IHDR(inode, raw_inode); |
345 | entry = IFIRST(header); | |
617ba13b | 346 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
a0626e75 | 347 | error = ext4_xattr_check_names(entry, end, entry); |
ac27a0ec DK |
348 | if (error) |
349 | goto cleanup; | |
617ba13b | 350 | error = ext4_xattr_find_entry(&entry, name_index, name, |
ac27a0ec DK |
351 | end - (void *)entry, 0); |
352 | if (error) | |
353 | goto cleanup; | |
354 | size = le32_to_cpu(entry->e_value_size); | |
355 | if (buffer) { | |
356 | error = -ERANGE; | |
357 | if (size > buffer_size) | |
358 | goto cleanup; | |
359 | memcpy(buffer, (void *)IFIRST(header) + | |
360 | le16_to_cpu(entry->e_value_offs), size); | |
361 | } | |
362 | error = size; | |
363 | ||
364 | cleanup: | |
365 | brelse(iloc.bh); | |
366 | return error; | |
367 | } | |
368 | ||
369 | /* | |
617ba13b | 370 | * ext4_xattr_get() |
ac27a0ec DK |
371 | * |
372 | * Copy an extended attribute into the buffer | |
373 | * provided, or compute the buffer size required. | |
374 | * Buffer is NULL to compute the size of the buffer required. | |
375 | * | |
376 | * Returns a negative error number on failure, or the number of bytes | |
377 | * used / required on success. | |
378 | */ | |
379 | int | |
617ba13b | 380 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
381 | void *buffer, size_t buffer_size) |
382 | { | |
383 | int error; | |
384 | ||
230b8c1a ZZ |
385 | if (strlen(name) > 255) |
386 | return -ERANGE; | |
387 | ||
617ba13b MC |
388 | down_read(&EXT4_I(inode)->xattr_sem); |
389 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
390 | buffer_size); |
391 | if (error == -ENODATA) | |
617ba13b | 392 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 393 | buffer_size); |
617ba13b | 394 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
395 | return error; |
396 | } | |
397 | ||
398 | static int | |
431547b3 | 399 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
400 | char *buffer, size_t buffer_size) |
401 | { | |
402 | size_t rest = buffer_size; | |
403 | ||
617ba13b | 404 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 405 | const struct xattr_handler *handler = |
617ba13b | 406 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec DK |
407 | |
408 | if (handler) { | |
431547b3 | 409 | size_t size = handler->list(dentry, buffer, rest, |
ac27a0ec | 410 | entry->e_name, |
431547b3 CH |
411 | entry->e_name_len, |
412 | handler->flags); | |
ac27a0ec DK |
413 | if (buffer) { |
414 | if (size > rest) | |
415 | return -ERANGE; | |
416 | buffer += size; | |
417 | } | |
418 | rest -= size; | |
419 | } | |
420 | } | |
421 | return buffer_size - rest; | |
422 | } | |
423 | ||
424 | static int | |
431547b3 | 425 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 426 | { |
431547b3 | 427 | struct inode *inode = dentry->d_inode; |
ac27a0ec DK |
428 | struct buffer_head *bh = NULL; |
429 | int error; | |
9c191f70 | 430 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
431 | |
432 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
433 | buffer, (long)buffer_size); | |
434 | ||
435 | error = 0; | |
617ba13b | 436 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 437 | goto cleanup; |
ace36ad4 JP |
438 | ea_idebug(inode, "reading block %llu", |
439 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 440 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
441 | error = -EIO; |
442 | if (!bh) | |
443 | goto cleanup; | |
444 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
445 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 446 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
447 | EXT4_ERROR_INODE(inode, "bad block %llu", |
448 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
449 | error = -EIO; |
450 | goto cleanup; | |
451 | } | |
9c191f70 | 452 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
431547b3 | 453 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); |
ac27a0ec DK |
454 | |
455 | cleanup: | |
456 | brelse(bh); | |
457 | ||
458 | return error; | |
459 | } | |
460 | ||
461 | static int | |
431547b3 | 462 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 463 | { |
431547b3 | 464 | struct inode *inode = dentry->d_inode; |
617ba13b MC |
465 | struct ext4_xattr_ibody_header *header; |
466 | struct ext4_inode *raw_inode; | |
467 | struct ext4_iloc iloc; | |
ac27a0ec DK |
468 | void *end; |
469 | int error; | |
470 | ||
19f5fb7a | 471 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 472 | return 0; |
617ba13b | 473 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
474 | if (error) |
475 | return error; | |
617ba13b | 476 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 477 | header = IHDR(inode, raw_inode); |
617ba13b | 478 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
a0626e75 | 479 | error = ext4_xattr_check_names(IFIRST(header), end, IFIRST(header)); |
ac27a0ec DK |
480 | if (error) |
481 | goto cleanup; | |
431547b3 | 482 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
483 | buffer, buffer_size); |
484 | ||
485 | cleanup: | |
486 | brelse(iloc.bh); | |
487 | return error; | |
488 | } | |
489 | ||
490 | /* | |
617ba13b | 491 | * ext4_xattr_list() |
ac27a0ec DK |
492 | * |
493 | * Copy a list of attribute names into the buffer | |
494 | * provided, or compute the buffer size required. | |
495 | * Buffer is NULL to compute the size of the buffer required. | |
496 | * | |
497 | * Returns a negative error number on failure, or the number of bytes | |
498 | * used / required on success. | |
499 | */ | |
d3a95d47 | 500 | static int |
431547b3 | 501 | ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 502 | { |
eaeef867 | 503 | int ret, ret2; |
ac27a0ec | 504 | |
431547b3 | 505 | down_read(&EXT4_I(dentry->d_inode)->xattr_sem); |
eaeef867 TT |
506 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
507 | if (ret < 0) | |
508 | goto errout; | |
509 | if (buffer) { | |
510 | buffer += ret; | |
511 | buffer_size -= ret; | |
ac27a0ec | 512 | } |
eaeef867 TT |
513 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
514 | if (ret < 0) | |
515 | goto errout; | |
516 | ret += ret2; | |
517 | errout: | |
431547b3 | 518 | up_read(&EXT4_I(dentry->d_inode)->xattr_sem); |
eaeef867 | 519 | return ret; |
ac27a0ec DK |
520 | } |
521 | ||
522 | /* | |
617ba13b | 523 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
524 | * not set, set it. |
525 | */ | |
617ba13b | 526 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
527 | struct super_block *sb) |
528 | { | |
617ba13b | 529 | if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR)) |
ac27a0ec DK |
530 | return; |
531 | ||
5d601255 | 532 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 533 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
ed2908f3 | 534 | EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR); |
a0375156 | 535 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec | 536 | } |
ac27a0ec DK |
537 | } |
538 | ||
539 | /* | |
ec4cb1aa JK |
540 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
541 | * otherwise free the block. | |
ac27a0ec DK |
542 | */ |
543 | static void | |
617ba13b | 544 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
ac27a0ec DK |
545 | struct buffer_head *bh) |
546 | { | |
547 | struct mb_cache_entry *ce = NULL; | |
8a2bfdcb | 548 | int error = 0; |
9c191f70 | 549 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec | 550 | |
9c191f70 | 551 | ce = mb_cache_entry_get(ext4_mb_cache, bh->b_bdev, bh->b_blocknr); |
5d601255 | 552 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
553 | error = ext4_journal_get_write_access(handle, bh); |
554 | if (error) | |
555 | goto out; | |
556 | ||
557 | lock_buffer(bh); | |
ac27a0ec DK |
558 | if (BHDR(bh)->h_refcount == cpu_to_le32(1)) { |
559 | ea_bdebug(bh, "refcount now=0; freeing"); | |
560 | if (ce) | |
561 | mb_cache_entry_free(ce); | |
ac27a0ec | 562 | get_bh(bh); |
ec4cb1aa | 563 | unlock_buffer(bh); |
e6362609 TT |
564 | ext4_free_blocks(handle, inode, bh, 0, 1, |
565 | EXT4_FREE_BLOCKS_METADATA | | |
566 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 567 | } else { |
e8546d06 | 568 | le32_add_cpu(&BHDR(bh)->h_refcount, -1); |
c1bb05a6 ES |
569 | if (ce) |
570 | mb_cache_entry_release(ce); | |
ec4cb1aa JK |
571 | /* |
572 | * Beware of this ugliness: Releasing of xattr block references | |
573 | * from different inodes can race and so we have to protect | |
574 | * from a race where someone else frees the block (and releases | |
575 | * its journal_head) before we are done dirtying the buffer. In | |
576 | * nojournal mode this race is harmless and we actually cannot | |
577 | * call ext4_handle_dirty_xattr_block() with locked buffer as | |
578 | * that function can call sync_dirty_buffer() so for that case | |
579 | * we handle the dirtying after unlocking the buffer. | |
580 | */ | |
581 | if (ext4_handle_valid(handle)) | |
582 | error = ext4_handle_dirty_xattr_block(handle, inode, | |
583 | bh); | |
c1bb05a6 | 584 | unlock_buffer(bh); |
ec4cb1aa JK |
585 | if (!ext4_handle_valid(handle)) |
586 | error = ext4_handle_dirty_xattr_block(handle, inode, | |
587 | bh); | |
8a2bfdcb | 588 | if (IS_SYNC(inode)) |
0390131b | 589 | ext4_handle_sync(handle); |
1231b3a1 | 590 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
591 | ea_bdebug(bh, "refcount now=%d; releasing", |
592 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 593 | } |
8a2bfdcb MC |
594 | out: |
595 | ext4_std_error(inode->i_sb, error); | |
596 | return; | |
ac27a0ec DK |
597 | } |
598 | ||
6dd4ee7c KS |
599 | /* |
600 | * Find the available free space for EAs. This also returns the total number of | |
601 | * bytes used by EA entries. | |
602 | */ | |
603 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
604 | size_t *min_offs, void *base, int *total) | |
605 | { | |
606 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
6dd4ee7c KS |
607 | if (!last->e_value_block && last->e_value_size) { |
608 | size_t offs = le16_to_cpu(last->e_value_offs); | |
609 | if (offs < *min_offs) | |
610 | *min_offs = offs; | |
611 | } | |
7b1b2c1b TT |
612 | if (total) |
613 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
614 | } |
615 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
616 | } | |
617 | ||
ac27a0ec | 618 | static int |
617ba13b | 619 | ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) |
ac27a0ec | 620 | { |
617ba13b | 621 | struct ext4_xattr_entry *last; |
ac27a0ec DK |
622 | size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); |
623 | ||
624 | /* Compute min_offs and last. */ | |
625 | last = s->first; | |
617ba13b | 626 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
ac27a0ec DK |
627 | if (!last->e_value_block && last->e_value_size) { |
628 | size_t offs = le16_to_cpu(last->e_value_offs); | |
629 | if (offs < min_offs) | |
630 | min_offs = offs; | |
631 | } | |
632 | } | |
633 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); | |
634 | if (!s->not_found) { | |
635 | if (!s->here->e_value_block && s->here->e_value_size) { | |
636 | size_t size = le32_to_cpu(s->here->e_value_size); | |
617ba13b | 637 | free += EXT4_XATTR_SIZE(size); |
ac27a0ec | 638 | } |
617ba13b | 639 | free += EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
640 | } |
641 | if (i->value) { | |
617ba13b MC |
642 | if (free < EXT4_XATTR_SIZE(i->value_len) || |
643 | free < EXT4_XATTR_LEN(name_len) + | |
644 | EXT4_XATTR_SIZE(i->value_len)) | |
ac27a0ec DK |
645 | return -ENOSPC; |
646 | } | |
647 | ||
648 | if (i->value && s->not_found) { | |
649 | /* Insert the new name. */ | |
617ba13b | 650 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
651 | size_t rest = (void *)last - (void *)s->here + sizeof(__u32); |
652 | memmove((void *)s->here + size, s->here, rest); | |
653 | memset(s->here, 0, size); | |
654 | s->here->e_name_index = i->name_index; | |
655 | s->here->e_name_len = name_len; | |
656 | memcpy(s->here->e_name, i->name, name_len); | |
657 | } else { | |
658 | if (!s->here->e_value_block && s->here->e_value_size) { | |
659 | void *first_val = s->base + min_offs; | |
660 | size_t offs = le16_to_cpu(s->here->e_value_offs); | |
661 | void *val = s->base + offs; | |
617ba13b | 662 | size_t size = EXT4_XATTR_SIZE( |
ac27a0ec DK |
663 | le32_to_cpu(s->here->e_value_size)); |
664 | ||
617ba13b | 665 | if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { |
ac27a0ec DK |
666 | /* The old and the new value have the same |
667 | size. Just replace. */ | |
668 | s->here->e_value_size = | |
669 | cpu_to_le32(i->value_len); | |
bd9926e8 TT |
670 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
671 | memset(val, 0, size); | |
672 | } else { | |
673 | /* Clear pad bytes first. */ | |
674 | memset(val + size - EXT4_XATTR_PAD, 0, | |
675 | EXT4_XATTR_PAD); | |
676 | memcpy(val, i->value, i->value_len); | |
677 | } | |
ac27a0ec DK |
678 | return 0; |
679 | } | |
680 | ||
681 | /* Remove the old value. */ | |
682 | memmove(first_val + size, first_val, val - first_val); | |
683 | memset(first_val, 0, size); | |
684 | s->here->e_value_size = 0; | |
685 | s->here->e_value_offs = 0; | |
686 | min_offs += size; | |
687 | ||
688 | /* Adjust all value offsets. */ | |
689 | last = s->first; | |
690 | while (!IS_LAST_ENTRY(last)) { | |
691 | size_t o = le16_to_cpu(last->e_value_offs); | |
692 | if (!last->e_value_block && | |
693 | last->e_value_size && o < offs) | |
694 | last->e_value_offs = | |
695 | cpu_to_le16(o + size); | |
617ba13b | 696 | last = EXT4_XATTR_NEXT(last); |
ac27a0ec DK |
697 | } |
698 | } | |
699 | if (!i->value) { | |
700 | /* Remove the old name. */ | |
617ba13b | 701 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
702 | last = ENTRY((void *)last - size); |
703 | memmove(s->here, (void *)s->here + size, | |
704 | (void *)last - (void *)s->here + sizeof(__u32)); | |
705 | memset(last, 0, size); | |
706 | } | |
707 | } | |
708 | ||
709 | if (i->value) { | |
710 | /* Insert the new value. */ | |
711 | s->here->e_value_size = cpu_to_le32(i->value_len); | |
712 | if (i->value_len) { | |
617ba13b | 713 | size_t size = EXT4_XATTR_SIZE(i->value_len); |
ac27a0ec DK |
714 | void *val = s->base + min_offs - size; |
715 | s->here->e_value_offs = cpu_to_le16(min_offs - size); | |
bd9926e8 TT |
716 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
717 | memset(val, 0, size); | |
718 | } else { | |
719 | /* Clear the pad bytes first. */ | |
720 | memset(val + size - EXT4_XATTR_PAD, 0, | |
721 | EXT4_XATTR_PAD); | |
722 | memcpy(val, i->value, i->value_len); | |
723 | } | |
ac27a0ec DK |
724 | } |
725 | } | |
726 | return 0; | |
727 | } | |
728 | ||
617ba13b MC |
729 | struct ext4_xattr_block_find { |
730 | struct ext4_xattr_search s; | |
ac27a0ec DK |
731 | struct buffer_head *bh; |
732 | }; | |
733 | ||
734 | static int | |
617ba13b MC |
735 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
736 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
737 | { |
738 | struct super_block *sb = inode->i_sb; | |
739 | int error; | |
740 | ||
741 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
742 | i->name_index, i->name, i->value, (long)i->value_len); | |
743 | ||
617ba13b | 744 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 745 | /* The inode already has an extended attribute block. */ |
617ba13b | 746 | bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
747 | error = -EIO; |
748 | if (!bs->bh) | |
749 | goto cleanup; | |
750 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", | |
751 | atomic_read(&(bs->bh->b_count)), | |
752 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
cc8e94fd | 753 | if (ext4_xattr_check_block(inode, bs->bh)) { |
24676da4 TT |
754 | EXT4_ERROR_INODE(inode, "bad block %llu", |
755 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
756 | error = -EIO; |
757 | goto cleanup; | |
758 | } | |
759 | /* Find the named attribute. */ | |
760 | bs->s.base = BHDR(bs->bh); | |
761 | bs->s.first = BFIRST(bs->bh); | |
762 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
763 | bs->s.here = bs->s.first; | |
617ba13b | 764 | error = ext4_xattr_find_entry(&bs->s.here, i->name_index, |
ac27a0ec DK |
765 | i->name, bs->bh->b_size, 1); |
766 | if (error && error != -ENODATA) | |
767 | goto cleanup; | |
768 | bs->s.not_found = error; | |
769 | } | |
770 | error = 0; | |
771 | ||
772 | cleanup: | |
773 | return error; | |
774 | } | |
775 | ||
776 | static int | |
617ba13b MC |
777 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
778 | struct ext4_xattr_info *i, | |
779 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
780 | { |
781 | struct super_block *sb = inode->i_sb; | |
782 | struct buffer_head *new_bh = NULL; | |
617ba13b | 783 | struct ext4_xattr_search *s = &bs->s; |
ac27a0ec | 784 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 785 | int error = 0; |
9c191f70 | 786 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec | 787 | |
617ba13b | 788 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec DK |
789 | |
790 | if (i->value && i->value_len > sb->s_blocksize) | |
791 | return -ENOSPC; | |
792 | if (s->base) { | |
9c191f70 | 793 | ce = mb_cache_entry_get(ext4_mb_cache, bs->bh->b_bdev, |
ac27a0ec | 794 | bs->bh->b_blocknr); |
5d601255 | 795 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
796 | error = ext4_journal_get_write_access(handle, bs->bh); |
797 | if (error) | |
798 | goto cleanup; | |
799 | lock_buffer(bs->bh); | |
800 | ||
ac27a0ec DK |
801 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
802 | if (ce) { | |
803 | mb_cache_entry_free(ce); | |
804 | ce = NULL; | |
805 | } | |
806 | ea_bdebug(bs->bh, "modifying in-place"); | |
617ba13b | 807 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
808 | if (!error) { |
809 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 810 | ext4_xattr_rehash(header(s->base), |
ac27a0ec | 811 | s->here); |
9c191f70 M |
812 | ext4_xattr_cache_insert(ext4_mb_cache, |
813 | bs->bh); | |
ac27a0ec DK |
814 | } |
815 | unlock_buffer(bs->bh); | |
816 | if (error == -EIO) | |
817 | goto bad_block; | |
818 | if (!error) | |
cc8e94fd DW |
819 | error = ext4_handle_dirty_xattr_block(handle, |
820 | inode, | |
821 | bs->bh); | |
ac27a0ec DK |
822 | if (error) |
823 | goto cleanup; | |
824 | goto inserted; | |
825 | } else { | |
826 | int offset = (char *)s->here - bs->bh->b_data; | |
827 | ||
8a2bfdcb | 828 | unlock_buffer(bs->bh); |
ac27a0ec DK |
829 | if (ce) { |
830 | mb_cache_entry_release(ce); | |
831 | ce = NULL; | |
832 | } | |
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); |
ac27a0ec DK |
860 | if (error == -EIO) |
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); | |
e8546d06 | 887 | le32_add_cpu(&BHDR(new_bh)->h_refcount, 1); |
ac27a0ec DK |
888 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
889 | le32_to_cpu(BHDR(new_bh)->h_refcount)); | |
890 | unlock_buffer(new_bh); | |
cc8e94fd DW |
891 | error = ext4_handle_dirty_xattr_block(handle, |
892 | inode, | |
893 | new_bh); | |
ac27a0ec DK |
894 | if (error) |
895 | goto cleanup_dquot; | |
896 | } | |
897 | mb_cache_entry_release(ce); | |
898 | ce = NULL; | |
899 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
900 | /* We were modifying this block in-place. */ | |
901 | ea_bdebug(bs->bh, "keeping this block"); | |
902 | new_bh = bs->bh; | |
903 | get_bh(new_bh); | |
904 | } else { | |
905 | /* We need to allocate a new block */ | |
fb0a387d ES |
906 | ext4_fsblk_t goal, block; |
907 | ||
908 | goal = ext4_group_first_block_no(sb, | |
d00a6d7b | 909 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
910 | |
911 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 912 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
913 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
914 | ||
55f020db AH |
915 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
916 | NULL, &error); | |
ac27a0ec DK |
917 | if (error) |
918 | goto cleanup; | |
fb0a387d | 919 | |
12e9b892 | 920 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
921 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
922 | ||
ace36ad4 JP |
923 | ea_idebug(inode, "creating block %llu", |
924 | (unsigned long long)block); | |
ac27a0ec DK |
925 | |
926 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 927 | if (unlikely(!new_bh)) { |
860d21e2 | 928 | error = -ENOMEM; |
ac27a0ec | 929 | getblk_failed: |
7dc57615 | 930 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 931 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
932 | goto cleanup; |
933 | } | |
934 | lock_buffer(new_bh); | |
617ba13b | 935 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
936 | if (error) { |
937 | unlock_buffer(new_bh); | |
860d21e2 | 938 | error = -EIO; |
ac27a0ec DK |
939 | goto getblk_failed; |
940 | } | |
941 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
942 | set_buffer_uptodate(new_bh); | |
943 | unlock_buffer(new_bh); | |
9c191f70 | 944 | ext4_xattr_cache_insert(ext4_mb_cache, new_bh); |
cc8e94fd DW |
945 | error = ext4_handle_dirty_xattr_block(handle, |
946 | inode, new_bh); | |
ac27a0ec DK |
947 | if (error) |
948 | goto cleanup; | |
949 | } | |
950 | } | |
951 | ||
952 | /* Update the inode. */ | |
617ba13b | 953 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
954 | |
955 | /* Drop the previous xattr block. */ | |
956 | if (bs->bh && bs->bh != new_bh) | |
617ba13b | 957 | ext4_xattr_release_block(handle, inode, bs->bh); |
ac27a0ec DK |
958 | error = 0; |
959 | ||
960 | cleanup: | |
961 | if (ce) | |
962 | mb_cache_entry_release(ce); | |
963 | brelse(new_bh); | |
964 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
965 | kfree(s->base); | |
966 | ||
967 | return error; | |
968 | ||
969 | cleanup_dquot: | |
1231b3a1 | 970 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
971 | goto cleanup; |
972 | ||
973 | bad_block: | |
24676da4 TT |
974 | EXT4_ERROR_INODE(inode, "bad block %llu", |
975 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
976 | goto cleanup; |
977 | ||
978 | #undef header | |
979 | } | |
980 | ||
879b3825 TM |
981 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
982 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 983 | { |
617ba13b MC |
984 | struct ext4_xattr_ibody_header *header; |
985 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
986 | int error; |
987 | ||
617ba13b | 988 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 989 | return 0; |
617ba13b | 990 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
991 | header = IHDR(inode, raw_inode); |
992 | is->s.base = is->s.first = IFIRST(header); | |
993 | is->s.here = is->s.first; | |
617ba13b | 994 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 995 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
a0626e75 DW |
996 | error = ext4_xattr_check_names(IFIRST(header), is->s.end, |
997 | IFIRST(header)); | |
ac27a0ec DK |
998 | if (error) |
999 | return error; | |
1000 | /* Find the named attribute. */ | |
617ba13b | 1001 | error = ext4_xattr_find_entry(&is->s.here, i->name_index, |
ac27a0ec DK |
1002 | i->name, is->s.end - |
1003 | (void *)is->s.base, 0); | |
1004 | if (error && error != -ENODATA) | |
1005 | return error; | |
1006 | is->s.not_found = error; | |
1007 | } | |
1008 | return 0; | |
1009 | } | |
1010 | ||
0d812f77 TM |
1011 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
1012 | struct ext4_xattr_info *i, | |
1013 | struct ext4_xattr_ibody_find *is) | |
1014 | { | |
1015 | struct ext4_xattr_ibody_header *header; | |
1016 | struct ext4_xattr_search *s = &is->s; | |
1017 | int error; | |
1018 | ||
1019 | if (EXT4_I(inode)->i_extra_isize == 0) | |
1020 | return -ENOSPC; | |
1021 | error = ext4_xattr_set_entry(i, s); | |
1022 | if (error) { | |
1023 | if (error == -ENOSPC && | |
1024 | ext4_has_inline_data(inode)) { | |
1025 | error = ext4_try_to_evict_inline_data(handle, inode, | |
1026 | EXT4_XATTR_LEN(strlen(i->name) + | |
1027 | EXT4_XATTR_SIZE(i->value_len))); | |
1028 | if (error) | |
1029 | return error; | |
1030 | error = ext4_xattr_ibody_find(inode, i, is); | |
1031 | if (error) | |
1032 | return error; | |
1033 | error = ext4_xattr_set_entry(i, s); | |
1034 | } | |
1035 | if (error) | |
1036 | return error; | |
1037 | } | |
1038 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); | |
1039 | if (!IS_LAST_ENTRY(s->first)) { | |
1040 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
1041 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
1042 | } else { | |
1043 | header->h_magic = cpu_to_le32(0); | |
1044 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
1045 | } | |
1046 | return 0; | |
1047 | } | |
1048 | ||
1049 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, | |
1050 | 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_xattr_search *s = &is->s; | |
ac27a0ec DK |
1055 | int error; |
1056 | ||
617ba13b | 1057 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1058 | return -ENOSPC; |
617ba13b | 1059 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
1060 | if (error) |
1061 | return error; | |
617ba13b | 1062 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 1063 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 1064 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 1065 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1066 | } else { |
1067 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 1068 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1069 | } |
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | /* | |
617ba13b | 1074 | * ext4_xattr_set_handle() |
ac27a0ec | 1075 | * |
6e9510b0 | 1076 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
1077 | * is NULL to remove an existing extended attribute, and non-NULL to |
1078 | * either replace an existing extended attribute, or create a new extended | |
1079 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
1080 | * specify that an extended attribute must exist and must not exist | |
1081 | * previous to the call, respectively. | |
1082 | * | |
1083 | * Returns 0, or a negative error number on failure. | |
1084 | */ | |
1085 | int | |
617ba13b | 1086 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
1087 | const char *name, const void *value, size_t value_len, |
1088 | int flags) | |
1089 | { | |
617ba13b | 1090 | struct ext4_xattr_info i = { |
ac27a0ec DK |
1091 | .name_index = name_index, |
1092 | .name = name, | |
1093 | .value = value, | |
1094 | .value_len = value_len, | |
1095 | ||
1096 | }; | |
617ba13b | 1097 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
1098 | .s = { .not_found = -ENODATA, }, |
1099 | }; | |
617ba13b | 1100 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
1101 | .s = { .not_found = -ENODATA, }, |
1102 | }; | |
4d20c685 | 1103 | unsigned long no_expand; |
ac27a0ec DK |
1104 | int error; |
1105 | ||
1106 | if (!name) | |
1107 | return -EINVAL; | |
1108 | if (strlen(name) > 255) | |
1109 | return -ERANGE; | |
617ba13b | 1110 | down_write(&EXT4_I(inode)->xattr_sem); |
19f5fb7a TT |
1111 | no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); |
1112 | ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); | |
4d20c685 | 1113 | |
66543617 | 1114 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
1115 | if (error) |
1116 | goto cleanup; | |
1117 | ||
19f5fb7a | 1118 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
1119 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
1120 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 1121 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
1122 | } |
1123 | ||
617ba13b | 1124 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
1125 | if (error) |
1126 | goto cleanup; | |
1127 | if (is.s.not_found) | |
617ba13b | 1128 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
1129 | if (error) |
1130 | goto cleanup; | |
1131 | if (is.s.not_found && bs.s.not_found) { | |
1132 | error = -ENODATA; | |
1133 | if (flags & XATTR_REPLACE) | |
1134 | goto cleanup; | |
1135 | error = 0; | |
1136 | if (!value) | |
1137 | goto cleanup; | |
1138 | } else { | |
1139 | error = -EEXIST; | |
1140 | if (flags & XATTR_CREATE) | |
1141 | goto cleanup; | |
1142 | } | |
ac27a0ec DK |
1143 | if (!value) { |
1144 | if (!is.s.not_found) | |
617ba13b | 1145 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 1146 | else if (!bs.s.not_found) |
617ba13b | 1147 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1148 | } else { |
617ba13b | 1149 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
1150 | if (!error && !bs.s.not_found) { |
1151 | i.value = NULL; | |
617ba13b | 1152 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1153 | } else if (error == -ENOSPC) { |
7e01c8e5 TY |
1154 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
1155 | error = ext4_xattr_block_find(inode, &i, &bs); | |
1156 | if (error) | |
1157 | goto cleanup; | |
1158 | } | |
617ba13b | 1159 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec DK |
1160 | if (error) |
1161 | goto cleanup; | |
1162 | if (!is.s.not_found) { | |
1163 | i.value = NULL; | |
617ba13b | 1164 | error = ext4_xattr_ibody_set(handle, inode, &i, |
ac27a0ec DK |
1165 | &is); |
1166 | } | |
1167 | } | |
1168 | } | |
1169 | if (!error) { | |
617ba13b | 1170 | ext4_xattr_update_super_block(handle, inode->i_sb); |
ef7f3835 | 1171 | inode->i_ctime = ext4_current_time(inode); |
6dd4ee7c | 1172 | if (!value) |
19f5fb7a | 1173 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
617ba13b | 1174 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 1175 | /* |
617ba13b | 1176 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
1177 | * error != 0. |
1178 | */ | |
1179 | is.iloc.bh = NULL; | |
1180 | if (IS_SYNC(inode)) | |
0390131b | 1181 | ext4_handle_sync(handle); |
ac27a0ec DK |
1182 | } |
1183 | ||
1184 | cleanup: | |
1185 | brelse(is.iloc.bh); | |
1186 | brelse(bs.bh); | |
4d20c685 | 1187 | if (no_expand == 0) |
19f5fb7a | 1188 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
617ba13b | 1189 | up_write(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
1190 | return error; |
1191 | } | |
1192 | ||
1193 | /* | |
617ba13b | 1194 | * ext4_xattr_set() |
ac27a0ec | 1195 | * |
617ba13b | 1196 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
1197 | * attribute modification is a filesystem transaction by itself. |
1198 | * | |
1199 | * Returns 0, or a negative error number on failure. | |
1200 | */ | |
1201 | int | |
617ba13b | 1202 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
1203 | const void *value, size_t value_len, int flags) |
1204 | { | |
1205 | handle_t *handle; | |
1206 | int error, retries = 0; | |
95eaefbd | 1207 | int credits = ext4_jbd2_credits_xattr(inode); |
ac27a0ec DK |
1208 | |
1209 | retry: | |
9924a92a | 1210 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
1211 | if (IS_ERR(handle)) { |
1212 | error = PTR_ERR(handle); | |
1213 | } else { | |
1214 | int error2; | |
1215 | ||
617ba13b | 1216 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 1217 | value, value_len, flags); |
617ba13b | 1218 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 1219 | if (error == -ENOSPC && |
617ba13b | 1220 | ext4_should_retry_alloc(inode->i_sb, &retries)) |
ac27a0ec DK |
1221 | goto retry; |
1222 | if (error == 0) | |
1223 | error = error2; | |
1224 | } | |
1225 | ||
1226 | return error; | |
1227 | } | |
1228 | ||
6dd4ee7c KS |
1229 | /* |
1230 | * Shift the EA entries in the inode to create space for the increased | |
1231 | * i_extra_isize. | |
1232 | */ | |
1233 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
1234 | int value_offs_shift, void *to, | |
1235 | void *from, size_t n, int blocksize) | |
1236 | { | |
1237 | struct ext4_xattr_entry *last = entry; | |
1238 | int new_offs; | |
1239 | ||
1240 | /* Adjust the value offsets of the entries */ | |
1241 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1242 | if (!last->e_value_block && last->e_value_size) { | |
1243 | new_offs = le16_to_cpu(last->e_value_offs) + | |
1244 | value_offs_shift; | |
1245 | BUG_ON(new_offs + le32_to_cpu(last->e_value_size) | |
1246 | > blocksize); | |
1247 | last->e_value_offs = cpu_to_le16(new_offs); | |
1248 | } | |
1249 | } | |
1250 | /* Shift the entries by n bytes */ | |
1251 | memmove(to, from, n); | |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
1256 | * Returns 0 on success or negative error number on failure. | |
1257 | */ | |
1258 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
1259 | struct ext4_inode *raw_inode, handle_t *handle) | |
1260 | { | |
1261 | struct ext4_xattr_ibody_header *header; | |
1262 | struct ext4_xattr_entry *entry, *last, *first; | |
1263 | struct buffer_head *bh = NULL; | |
1264 | struct ext4_xattr_ibody_find *is = NULL; | |
1265 | struct ext4_xattr_block_find *bs = NULL; | |
1266 | char *buffer = NULL, *b_entry_name = NULL; | |
1267 | size_t min_offs, free; | |
7b1b2c1b | 1268 | int total_ino; |
6dd4ee7c KS |
1269 | void *base, *start, *end; |
1270 | int extra_isize = 0, error = 0, tried_min_extra_isize = 0; | |
ac39849d | 1271 | int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); |
6dd4ee7c KS |
1272 | |
1273 | down_write(&EXT4_I(inode)->xattr_sem); | |
1274 | retry: | |
1275 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { | |
1276 | up_write(&EXT4_I(inode)->xattr_sem); | |
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | header = IHDR(inode, raw_inode); | |
1281 | entry = IFIRST(header); | |
1282 | ||
1283 | /* | |
1284 | * Check if enough free space is available in the inode to shift the | |
1285 | * entries ahead by new_extra_isize. | |
1286 | */ | |
1287 | ||
1288 | base = start = entry; | |
1289 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
1290 | min_offs = end - base; | |
1291 | last = entry; | |
1292 | total_ino = sizeof(struct ext4_xattr_ibody_header); | |
1293 | ||
1294 | free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); | |
1295 | if (free >= new_extra_isize) { | |
1296 | entry = IFIRST(header); | |
1297 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize | |
1298 | - new_extra_isize, (void *)raw_inode + | |
1299 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
1300 | (void *)header, total_ino, | |
1301 | inode->i_sb->s_blocksize); | |
1302 | EXT4_I(inode)->i_extra_isize = new_extra_isize; | |
1303 | error = 0; | |
1304 | goto cleanup; | |
1305 | } | |
1306 | ||
1307 | /* | |
1308 | * Enough free space isn't available in the inode, check if | |
1309 | * EA block can hold new_extra_isize bytes. | |
1310 | */ | |
1311 | if (EXT4_I(inode)->i_file_acl) { | |
1312 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
1313 | error = -EIO; | |
1314 | if (!bh) | |
1315 | goto cleanup; | |
cc8e94fd | 1316 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
1317 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1318 | EXT4_I(inode)->i_file_acl); | |
6dd4ee7c KS |
1319 | error = -EIO; |
1320 | goto cleanup; | |
1321 | } | |
1322 | base = BHDR(bh); | |
1323 | first = BFIRST(bh); | |
1324 | end = bh->b_data + bh->b_size; | |
1325 | min_offs = end - base; | |
7b1b2c1b | 1326 | free = ext4_xattr_free_space(first, &min_offs, base, NULL); |
6dd4ee7c KS |
1327 | if (free < new_extra_isize) { |
1328 | if (!tried_min_extra_isize && s_min_extra_isize) { | |
1329 | tried_min_extra_isize++; | |
1330 | new_extra_isize = s_min_extra_isize; | |
1331 | brelse(bh); | |
1332 | goto retry; | |
1333 | } | |
1334 | error = -1; | |
1335 | goto cleanup; | |
1336 | } | |
1337 | } else { | |
1338 | free = inode->i_sb->s_blocksize; | |
1339 | } | |
1340 | ||
1341 | while (new_extra_isize > 0) { | |
1342 | size_t offs, size, entry_size; | |
1343 | struct ext4_xattr_entry *small_entry = NULL; | |
1344 | struct ext4_xattr_info i = { | |
1345 | .value = NULL, | |
1346 | .value_len = 0, | |
1347 | }; | |
1348 | unsigned int total_size; /* EA entry size + value size */ | |
1349 | unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ | |
1350 | unsigned int min_total_size = ~0U; | |
1351 | ||
1352 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); | |
1353 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
1354 | if (!is || !bs) { | |
1355 | error = -ENOMEM; | |
1356 | goto cleanup; | |
1357 | } | |
1358 | ||
1359 | is->s.not_found = -ENODATA; | |
1360 | bs->s.not_found = -ENODATA; | |
1361 | is->iloc.bh = NULL; | |
1362 | bs->bh = NULL; | |
1363 | ||
1364 | last = IFIRST(header); | |
1365 | /* Find the entry best suited to be pushed into EA block */ | |
1366 | entry = NULL; | |
1367 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1368 | total_size = | |
1369 | EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + | |
1370 | EXT4_XATTR_LEN(last->e_name_len); | |
1371 | if (total_size <= free && total_size < min_total_size) { | |
1372 | if (total_size < new_extra_isize) { | |
1373 | small_entry = last; | |
1374 | } else { | |
1375 | entry = last; | |
1376 | min_total_size = total_size; | |
1377 | } | |
1378 | } | |
1379 | } | |
1380 | ||
1381 | if (entry == NULL) { | |
1382 | if (small_entry) { | |
1383 | entry = small_entry; | |
1384 | } else { | |
1385 | if (!tried_min_extra_isize && | |
1386 | s_min_extra_isize) { | |
1387 | tried_min_extra_isize++; | |
1388 | new_extra_isize = s_min_extra_isize; | |
6e4ea8e3 DJ |
1389 | kfree(is); is = NULL; |
1390 | kfree(bs); bs = NULL; | |
dcb9917b | 1391 | brelse(bh); |
6dd4ee7c KS |
1392 | goto retry; |
1393 | } | |
1394 | error = -1; | |
1395 | goto cleanup; | |
1396 | } | |
1397 | } | |
1398 | offs = le16_to_cpu(entry->e_value_offs); | |
1399 | size = le32_to_cpu(entry->e_value_size); | |
1400 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
1401 | i.name_index = entry->e_name_index, | |
1402 | buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); | |
1403 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
1404 | if (!buffer || !b_entry_name) { | |
1405 | error = -ENOMEM; | |
1406 | goto cleanup; | |
1407 | } | |
1408 | /* Save the entry name and the entry value */ | |
1409 | memcpy(buffer, (void *)IFIRST(header) + offs, | |
1410 | EXT4_XATTR_SIZE(size)); | |
1411 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); | |
1412 | b_entry_name[entry->e_name_len] = '\0'; | |
1413 | i.name = b_entry_name; | |
1414 | ||
1415 | error = ext4_get_inode_loc(inode, &is->iloc); | |
1416 | if (error) | |
1417 | goto cleanup; | |
1418 | ||
1419 | error = ext4_xattr_ibody_find(inode, &i, is); | |
1420 | if (error) | |
1421 | goto cleanup; | |
1422 | ||
1423 | /* Remove the chosen entry from the inode */ | |
1424 | error = ext4_xattr_ibody_set(handle, inode, &i, is); | |
9aaab058 RK |
1425 | if (error) |
1426 | goto cleanup; | |
6dd4ee7c KS |
1427 | |
1428 | entry = IFIRST(header); | |
1429 | if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) | |
1430 | shift_bytes = new_extra_isize; | |
1431 | else | |
1432 | shift_bytes = entry_size + size; | |
1433 | /* Adjust the offsets and shift the remaining entries ahead */ | |
1434 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - | |
1435 | shift_bytes, (void *)raw_inode + | |
1436 | EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, | |
1437 | (void *)header, total_ino - entry_size, | |
1438 | inode->i_sb->s_blocksize); | |
1439 | ||
1440 | extra_isize += shift_bytes; | |
1441 | new_extra_isize -= shift_bytes; | |
1442 | EXT4_I(inode)->i_extra_isize = extra_isize; | |
1443 | ||
1444 | i.name = b_entry_name; | |
1445 | i.value = buffer; | |
ac39849d | 1446 | i.value_len = size; |
6dd4ee7c KS |
1447 | error = ext4_xattr_block_find(inode, &i, bs); |
1448 | if (error) | |
1449 | goto cleanup; | |
1450 | ||
1451 | /* Add entry which was removed from the inode into the block */ | |
1452 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
1453 | if (error) | |
1454 | goto cleanup; | |
1455 | kfree(b_entry_name); | |
1456 | kfree(buffer); | |
d3533d72 JL |
1457 | b_entry_name = NULL; |
1458 | buffer = NULL; | |
6dd4ee7c KS |
1459 | brelse(is->iloc.bh); |
1460 | kfree(is); | |
1461 | kfree(bs); | |
1462 | } | |
1463 | brelse(bh); | |
1464 | up_write(&EXT4_I(inode)->xattr_sem); | |
1465 | return 0; | |
1466 | ||
1467 | cleanup: | |
1468 | kfree(b_entry_name); | |
1469 | kfree(buffer); | |
1470 | if (is) | |
1471 | brelse(is->iloc.bh); | |
1472 | kfree(is); | |
1473 | kfree(bs); | |
1474 | brelse(bh); | |
1475 | up_write(&EXT4_I(inode)->xattr_sem); | |
1476 | return error; | |
1477 | } | |
1478 | ||
1479 | ||
1480 | ||
ac27a0ec | 1481 | /* |
617ba13b | 1482 | * ext4_xattr_delete_inode() |
ac27a0ec DK |
1483 | * |
1484 | * Free extended attribute resources associated with this inode. This | |
1485 | * is called immediately before an inode is freed. We have exclusive | |
1486 | * access to the inode. | |
1487 | */ | |
1488 | void | |
617ba13b | 1489 | ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
1490 | { |
1491 | struct buffer_head *bh = NULL; | |
1492 | ||
617ba13b | 1493 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 1494 | goto cleanup; |
617ba13b | 1495 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec | 1496 | if (!bh) { |
24676da4 TT |
1497 | EXT4_ERROR_INODE(inode, "block %llu read error", |
1498 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1499 | goto cleanup; |
1500 | } | |
617ba13b | 1501 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 1502 | BHDR(bh)->h_blocks != cpu_to_le32(1)) { |
24676da4 TT |
1503 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1504 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1505 | goto cleanup; |
1506 | } | |
617ba13b MC |
1507 | ext4_xattr_release_block(handle, inode, bh); |
1508 | EXT4_I(inode)->i_file_acl = 0; | |
ac27a0ec DK |
1509 | |
1510 | cleanup: | |
1511 | brelse(bh); | |
1512 | } | |
1513 | ||
1514 | /* | |
617ba13b | 1515 | * ext4_xattr_put_super() |
ac27a0ec DK |
1516 | * |
1517 | * This is called when a file system is unmounted. | |
1518 | */ | |
1519 | void | |
617ba13b | 1520 | ext4_xattr_put_super(struct super_block *sb) |
ac27a0ec DK |
1521 | { |
1522 | mb_cache_shrink(sb->s_bdev); | |
1523 | } | |
1524 | ||
1525 | /* | |
617ba13b | 1526 | * ext4_xattr_cache_insert() |
ac27a0ec DK |
1527 | * |
1528 | * Create a new entry in the extended attribute cache, and insert | |
1529 | * it unless such an entry is already in the cache. | |
1530 | * | |
1531 | * Returns 0, or a negative error number on failure. | |
1532 | */ | |
1533 | static void | |
9c191f70 | 1534 | ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) |
ac27a0ec DK |
1535 | { |
1536 | __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); | |
1537 | struct mb_cache_entry *ce; | |
1538 | int error; | |
1539 | ||
9c191f70 | 1540 | ce = mb_cache_entry_alloc(ext4_mb_cache, GFP_NOFS); |
ac27a0ec DK |
1541 | if (!ce) { |
1542 | ea_bdebug(bh, "out of memory"); | |
1543 | return; | |
1544 | } | |
2aec7c52 | 1545 | error = mb_cache_entry_insert(ce, bh->b_bdev, bh->b_blocknr, hash); |
ac27a0ec DK |
1546 | if (error) { |
1547 | mb_cache_entry_free(ce); | |
1548 | if (error == -EBUSY) { | |
1549 | ea_bdebug(bh, "already in cache"); | |
1550 | error = 0; | |
1551 | } | |
1552 | } else { | |
1553 | ea_bdebug(bh, "inserting [%x]", (int)hash); | |
1554 | mb_cache_entry_release(ce); | |
1555 | } | |
1556 | } | |
1557 | ||
1558 | /* | |
617ba13b | 1559 | * ext4_xattr_cmp() |
ac27a0ec DK |
1560 | * |
1561 | * Compare two extended attribute blocks for equality. | |
1562 | * | |
1563 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
1564 | * a negative error number on errors. | |
1565 | */ | |
1566 | static int | |
617ba13b MC |
1567 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
1568 | struct ext4_xattr_header *header2) | |
ac27a0ec | 1569 | { |
617ba13b | 1570 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
1571 | |
1572 | entry1 = ENTRY(header1+1); | |
1573 | entry2 = ENTRY(header2+1); | |
1574 | while (!IS_LAST_ENTRY(entry1)) { | |
1575 | if (IS_LAST_ENTRY(entry2)) | |
1576 | return 1; | |
1577 | if (entry1->e_hash != entry2->e_hash || | |
1578 | entry1->e_name_index != entry2->e_name_index || | |
1579 | entry1->e_name_len != entry2->e_name_len || | |
1580 | entry1->e_value_size != entry2->e_value_size || | |
1581 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) | |
1582 | return 1; | |
1583 | if (entry1->e_value_block != 0 || entry2->e_value_block != 0) | |
1584 | return -EIO; | |
1585 | if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), | |
1586 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), | |
1587 | le32_to_cpu(entry1->e_value_size))) | |
1588 | return 1; | |
1589 | ||
617ba13b MC |
1590 | entry1 = EXT4_XATTR_NEXT(entry1); |
1591 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
1592 | } |
1593 | if (!IS_LAST_ENTRY(entry2)) | |
1594 | return 1; | |
1595 | return 0; | |
1596 | } | |
1597 | ||
1598 | /* | |
617ba13b | 1599 | * ext4_xattr_cache_find() |
ac27a0ec DK |
1600 | * |
1601 | * Find an identical extended attribute block. | |
1602 | * | |
1603 | * Returns a pointer to the block found, or NULL if such a block was | |
1604 | * not found or an error occurred. | |
1605 | */ | |
1606 | static struct buffer_head * | |
617ba13b | 1607 | ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, |
ac27a0ec DK |
1608 | struct mb_cache_entry **pce) |
1609 | { | |
1610 | __u32 hash = le32_to_cpu(header->h_hash); | |
1611 | struct mb_cache_entry *ce; | |
9c191f70 | 1612 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
1613 | |
1614 | if (!header->h_hash) | |
1615 | return NULL; /* never share */ | |
1616 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
1617 | again: | |
9c191f70 | 1618 | ce = mb_cache_entry_find_first(ext4_mb_cache, inode->i_sb->s_bdev, |
2aec7c52 | 1619 | hash); |
ac27a0ec DK |
1620 | while (ce) { |
1621 | struct buffer_head *bh; | |
1622 | ||
1623 | if (IS_ERR(ce)) { | |
1624 | if (PTR_ERR(ce) == -EAGAIN) | |
1625 | goto again; | |
1626 | break; | |
1627 | } | |
1628 | bh = sb_bread(inode->i_sb, ce->e_block); | |
1629 | if (!bh) { | |
24676da4 TT |
1630 | EXT4_ERROR_INODE(inode, "block %lu read error", |
1631 | (unsigned long) ce->e_block); | |
ac27a0ec | 1632 | } else if (le32_to_cpu(BHDR(bh)->h_refcount) >= |
617ba13b | 1633 | EXT4_XATTR_REFCOUNT_MAX) { |
ac27a0ec DK |
1634 | ea_idebug(inode, "block %lu refcount %d>=%d", |
1635 | (unsigned long) ce->e_block, | |
1636 | le32_to_cpu(BHDR(bh)->h_refcount), | |
617ba13b MC |
1637 | EXT4_XATTR_REFCOUNT_MAX); |
1638 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { | |
ac27a0ec DK |
1639 | *pce = ce; |
1640 | return bh; | |
1641 | } | |
1642 | brelse(bh); | |
2aec7c52 | 1643 | ce = mb_cache_entry_find_next(ce, inode->i_sb->s_bdev, hash); |
ac27a0ec DK |
1644 | } |
1645 | return NULL; | |
1646 | } | |
1647 | ||
1648 | #define NAME_HASH_SHIFT 5 | |
1649 | #define VALUE_HASH_SHIFT 16 | |
1650 | ||
1651 | /* | |
617ba13b | 1652 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
1653 | * |
1654 | * Compute the hash of an extended attribute. | |
1655 | */ | |
617ba13b MC |
1656 | static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, |
1657 | struct ext4_xattr_entry *entry) | |
ac27a0ec DK |
1658 | { |
1659 | __u32 hash = 0; | |
1660 | char *name = entry->e_name; | |
1661 | int n; | |
1662 | ||
2b2d6d01 | 1663 | for (n = 0; n < entry->e_name_len; n++) { |
ac27a0ec DK |
1664 | hash = (hash << NAME_HASH_SHIFT) ^ |
1665 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
1666 | *name++; | |
1667 | } | |
1668 | ||
1669 | if (entry->e_value_block == 0 && entry->e_value_size != 0) { | |
1670 | __le32 *value = (__le32 *)((char *)header + | |
1671 | le16_to_cpu(entry->e_value_offs)); | |
1672 | for (n = (le32_to_cpu(entry->e_value_size) + | |
617ba13b | 1673 | EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { |
ac27a0ec DK |
1674 | hash = (hash << VALUE_HASH_SHIFT) ^ |
1675 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
1676 | le32_to_cpu(*value++); | |
1677 | } | |
1678 | } | |
1679 | entry->e_hash = cpu_to_le32(hash); | |
1680 | } | |
1681 | ||
1682 | #undef NAME_HASH_SHIFT | |
1683 | #undef VALUE_HASH_SHIFT | |
1684 | ||
1685 | #define BLOCK_HASH_SHIFT 16 | |
1686 | ||
1687 | /* | |
617ba13b | 1688 | * ext4_xattr_rehash() |
ac27a0ec DK |
1689 | * |
1690 | * Re-compute the extended attribute hash value after an entry has changed. | |
1691 | */ | |
617ba13b MC |
1692 | static void ext4_xattr_rehash(struct ext4_xattr_header *header, |
1693 | struct ext4_xattr_entry *entry) | |
ac27a0ec | 1694 | { |
617ba13b | 1695 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
1696 | __u32 hash = 0; |
1697 | ||
617ba13b | 1698 | ext4_xattr_hash_entry(header, entry); |
ac27a0ec DK |
1699 | here = ENTRY(header+1); |
1700 | while (!IS_LAST_ENTRY(here)) { | |
1701 | if (!here->e_hash) { | |
1702 | /* Block is not shared if an entry's hash value == 0 */ | |
1703 | hash = 0; | |
1704 | break; | |
1705 | } | |
1706 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
1707 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
1708 | le32_to_cpu(here->e_hash); | |
617ba13b | 1709 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
1710 | } |
1711 | header->h_hash = cpu_to_le32(hash); | |
1712 | } | |
1713 | ||
1714 | #undef BLOCK_HASH_SHIFT | |
1715 | ||
9c191f70 M |
1716 | #define HASH_BUCKET_BITS 10 |
1717 | ||
1718 | struct mb_cache * | |
1719 | ext4_xattr_create_cache(char *name) | |
ac27a0ec | 1720 | { |
9c191f70 | 1721 | return mb_cache_create(name, HASH_BUCKET_BITS); |
ac27a0ec DK |
1722 | } |
1723 | ||
9c191f70 | 1724 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 1725 | { |
9c191f70 M |
1726 | if (cache) |
1727 | mb_cache_destroy(cache); | |
ac27a0ec | 1728 | } |
9c191f70 | 1729 |