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 | { | |
145 | if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, | |
146 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && | |
147 | (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr))) | |
148 | return 0; | |
149 | return 1; | |
150 | } | |
151 | ||
152 | static void ext4_xattr_block_csum_set(struct inode *inode, | |
153 | sector_t block_nr, | |
154 | struct ext4_xattr_header *hdr) | |
155 | { | |
156 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, | |
157 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) | |
158 | return; | |
159 | ||
160 | hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr); | |
161 | } | |
162 | ||
163 | static inline int ext4_handle_dirty_xattr_block(handle_t *handle, | |
164 | struct inode *inode, | |
165 | struct buffer_head *bh) | |
166 | { | |
167 | ext4_xattr_block_csum_set(inode, bh->b_blocknr, BHDR(bh)); | |
168 | return ext4_handle_dirty_metadata(handle, inode, bh); | |
169 | } | |
170 | ||
11e27528 | 171 | static inline const struct xattr_handler * |
617ba13b | 172 | ext4_xattr_handler(int name_index) |
ac27a0ec | 173 | { |
11e27528 | 174 | const struct xattr_handler *handler = NULL; |
ac27a0ec | 175 | |
617ba13b MC |
176 | if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
177 | handler = ext4_xattr_handler_map[name_index]; | |
ac27a0ec DK |
178 | return handler; |
179 | } | |
180 | ||
181 | /* | |
182 | * Inode operation listxattr() | |
183 | * | |
184 | * dentry->d_inode->i_mutex: don't care | |
185 | */ | |
186 | ssize_t | |
617ba13b | 187 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) |
ac27a0ec | 188 | { |
431547b3 | 189 | return ext4_xattr_list(dentry, buffer, size); |
ac27a0ec DK |
190 | } |
191 | ||
192 | static int | |
617ba13b | 193 | ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end) |
ac27a0ec DK |
194 | { |
195 | while (!IS_LAST_ENTRY(entry)) { | |
617ba13b | 196 | struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(entry); |
ac27a0ec DK |
197 | if ((void *)next >= end) |
198 | return -EIO; | |
199 | entry = next; | |
200 | } | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static inline int | |
cc8e94fd | 205 | ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) |
ac27a0ec | 206 | { |
cc8e94fd DW |
207 | int error; |
208 | ||
209 | if (buffer_verified(bh)) | |
210 | return 0; | |
211 | ||
617ba13b | 212 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec DK |
213 | BHDR(bh)->h_blocks != cpu_to_le32(1)) |
214 | return -EIO; | |
cc8e94fd DW |
215 | if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh))) |
216 | return -EIO; | |
217 | error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size); | |
218 | if (!error) | |
219 | set_buffer_verified(bh); | |
220 | return error; | |
ac27a0ec DK |
221 | } |
222 | ||
223 | static inline int | |
617ba13b | 224 | ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) |
ac27a0ec DK |
225 | { |
226 | size_t value_size = le32_to_cpu(entry->e_value_size); | |
227 | ||
228 | if (entry->e_value_block != 0 || value_size > size || | |
229 | le16_to_cpu(entry->e_value_offs) + value_size > size) | |
230 | return -EIO; | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static int | |
617ba13b | 235 | ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, |
ac27a0ec DK |
236 | const char *name, size_t size, int sorted) |
237 | { | |
617ba13b | 238 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
239 | size_t name_len; |
240 | int cmp = 1; | |
241 | ||
242 | if (name == NULL) | |
243 | return -EINVAL; | |
244 | name_len = strlen(name); | |
245 | entry = *pentry; | |
617ba13b | 246 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
ac27a0ec DK |
247 | cmp = name_index - entry->e_name_index; |
248 | if (!cmp) | |
249 | cmp = name_len - entry->e_name_len; | |
250 | if (!cmp) | |
251 | cmp = memcmp(name, entry->e_name, name_len); | |
252 | if (cmp <= 0 && (sorted || cmp == 0)) | |
253 | break; | |
254 | } | |
255 | *pentry = entry; | |
617ba13b | 256 | if (!cmp && ext4_xattr_check_entry(entry, size)) |
ac27a0ec DK |
257 | return -EIO; |
258 | return cmp ? -ENODATA : 0; | |
259 | } | |
260 | ||
261 | static int | |
617ba13b | 262 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
263 | void *buffer, size_t buffer_size) |
264 | { | |
265 | struct buffer_head *bh = NULL; | |
617ba13b | 266 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
267 | size_t size; |
268 | int error; | |
9c191f70 | 269 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
270 | |
271 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
272 | name_index, name, buffer, (long)buffer_size); | |
273 | ||
274 | error = -ENODATA; | |
617ba13b | 275 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 276 | goto cleanup; |
ace36ad4 JP |
277 | ea_idebug(inode, "reading block %llu", |
278 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 279 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
280 | if (!bh) |
281 | goto cleanup; | |
282 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
283 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 284 | if (ext4_xattr_check_block(inode, bh)) { |
12062ddd | 285 | bad_block: |
24676da4 TT |
286 | EXT4_ERROR_INODE(inode, "bad block %llu", |
287 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
288 | error = -EIO; |
289 | goto cleanup; | |
290 | } | |
9c191f70 | 291 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
ac27a0ec | 292 | entry = BFIRST(bh); |
617ba13b | 293 | error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); |
ac27a0ec DK |
294 | if (error == -EIO) |
295 | goto bad_block; | |
296 | if (error) | |
297 | goto cleanup; | |
298 | size = le32_to_cpu(entry->e_value_size); | |
299 | if (buffer) { | |
300 | error = -ERANGE; | |
301 | if (size > buffer_size) | |
302 | goto cleanup; | |
303 | memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), | |
304 | size); | |
305 | } | |
306 | error = size; | |
307 | ||
308 | cleanup: | |
309 | brelse(bh); | |
310 | return error; | |
311 | } | |
312 | ||
879b3825 | 313 | int |
617ba13b | 314 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
315 | void *buffer, size_t buffer_size) |
316 | { | |
617ba13b MC |
317 | struct ext4_xattr_ibody_header *header; |
318 | struct ext4_xattr_entry *entry; | |
319 | struct ext4_inode *raw_inode; | |
320 | struct ext4_iloc iloc; | |
ac27a0ec DK |
321 | size_t size; |
322 | void *end; | |
323 | int error; | |
324 | ||
19f5fb7a | 325 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 326 | return -ENODATA; |
617ba13b | 327 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
328 | if (error) |
329 | return error; | |
617ba13b | 330 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec DK |
331 | header = IHDR(inode, raw_inode); |
332 | entry = IFIRST(header); | |
617ba13b MC |
333 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
334 | error = ext4_xattr_check_names(entry, end); | |
ac27a0ec DK |
335 | if (error) |
336 | goto cleanup; | |
617ba13b | 337 | error = ext4_xattr_find_entry(&entry, name_index, name, |
ac27a0ec DK |
338 | end - (void *)entry, 0); |
339 | if (error) | |
340 | goto cleanup; | |
341 | size = le32_to_cpu(entry->e_value_size); | |
342 | if (buffer) { | |
343 | error = -ERANGE; | |
344 | if (size > buffer_size) | |
345 | goto cleanup; | |
346 | memcpy(buffer, (void *)IFIRST(header) + | |
347 | le16_to_cpu(entry->e_value_offs), size); | |
348 | } | |
349 | error = size; | |
350 | ||
351 | cleanup: | |
352 | brelse(iloc.bh); | |
353 | return error; | |
354 | } | |
355 | ||
356 | /* | |
617ba13b | 357 | * ext4_xattr_get() |
ac27a0ec DK |
358 | * |
359 | * Copy an extended attribute into the buffer | |
360 | * provided, or compute the buffer size required. | |
361 | * Buffer is NULL to compute the size of the buffer required. | |
362 | * | |
363 | * Returns a negative error number on failure, or the number of bytes | |
364 | * used / required on success. | |
365 | */ | |
366 | int | |
617ba13b | 367 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
368 | void *buffer, size_t buffer_size) |
369 | { | |
370 | int error; | |
371 | ||
230b8c1a ZZ |
372 | if (strlen(name) > 255) |
373 | return -ERANGE; | |
374 | ||
617ba13b MC |
375 | down_read(&EXT4_I(inode)->xattr_sem); |
376 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
377 | buffer_size); |
378 | if (error == -ENODATA) | |
617ba13b | 379 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 380 | buffer_size); |
617ba13b | 381 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
382 | return error; |
383 | } | |
384 | ||
385 | static int | |
431547b3 | 386 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
387 | char *buffer, size_t buffer_size) |
388 | { | |
389 | size_t rest = buffer_size; | |
390 | ||
617ba13b | 391 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 392 | const struct xattr_handler *handler = |
617ba13b | 393 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec DK |
394 | |
395 | if (handler) { | |
431547b3 | 396 | size_t size = handler->list(dentry, buffer, rest, |
ac27a0ec | 397 | entry->e_name, |
431547b3 CH |
398 | entry->e_name_len, |
399 | handler->flags); | |
ac27a0ec DK |
400 | if (buffer) { |
401 | if (size > rest) | |
402 | return -ERANGE; | |
403 | buffer += size; | |
404 | } | |
405 | rest -= size; | |
406 | } | |
407 | } | |
408 | return buffer_size - rest; | |
409 | } | |
410 | ||
411 | static int | |
431547b3 | 412 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 413 | { |
431547b3 | 414 | struct inode *inode = dentry->d_inode; |
ac27a0ec DK |
415 | struct buffer_head *bh = NULL; |
416 | int error; | |
9c191f70 | 417 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
418 | |
419 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
420 | buffer, (long)buffer_size); | |
421 | ||
422 | error = 0; | |
617ba13b | 423 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 424 | goto cleanup; |
ace36ad4 JP |
425 | ea_idebug(inode, "reading block %llu", |
426 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 427 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
428 | error = -EIO; |
429 | if (!bh) | |
430 | goto cleanup; | |
431 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
432 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 433 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
434 | EXT4_ERROR_INODE(inode, "bad block %llu", |
435 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
436 | error = -EIO; |
437 | goto cleanup; | |
438 | } | |
9c191f70 | 439 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
431547b3 | 440 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); |
ac27a0ec DK |
441 | |
442 | cleanup: | |
443 | brelse(bh); | |
444 | ||
445 | return error; | |
446 | } | |
447 | ||
448 | static int | |
431547b3 | 449 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 450 | { |
431547b3 | 451 | struct inode *inode = dentry->d_inode; |
617ba13b MC |
452 | struct ext4_xattr_ibody_header *header; |
453 | struct ext4_inode *raw_inode; | |
454 | struct ext4_iloc iloc; | |
ac27a0ec DK |
455 | void *end; |
456 | int error; | |
457 | ||
19f5fb7a | 458 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 459 | return 0; |
617ba13b | 460 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
461 | if (error) |
462 | return error; | |
617ba13b | 463 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 464 | header = IHDR(inode, raw_inode); |
617ba13b MC |
465 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
466 | error = ext4_xattr_check_names(IFIRST(header), end); | |
ac27a0ec DK |
467 | if (error) |
468 | goto cleanup; | |
431547b3 | 469 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
470 | buffer, buffer_size); |
471 | ||
472 | cleanup: | |
473 | brelse(iloc.bh); | |
474 | return error; | |
475 | } | |
476 | ||
477 | /* | |
617ba13b | 478 | * ext4_xattr_list() |
ac27a0ec DK |
479 | * |
480 | * Copy a list of attribute names into the buffer | |
481 | * provided, or compute the buffer size required. | |
482 | * Buffer is NULL to compute the size of the buffer required. | |
483 | * | |
484 | * Returns a negative error number on failure, or the number of bytes | |
485 | * used / required on success. | |
486 | */ | |
d3a95d47 | 487 | static int |
431547b3 | 488 | ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 489 | { |
eaeef867 | 490 | int ret, ret2; |
ac27a0ec | 491 | |
431547b3 | 492 | down_read(&EXT4_I(dentry->d_inode)->xattr_sem); |
eaeef867 TT |
493 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
494 | if (ret < 0) | |
495 | goto errout; | |
496 | if (buffer) { | |
497 | buffer += ret; | |
498 | buffer_size -= ret; | |
ac27a0ec | 499 | } |
eaeef867 TT |
500 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
501 | if (ret < 0) | |
502 | goto errout; | |
503 | ret += ret2; | |
504 | errout: | |
431547b3 | 505 | up_read(&EXT4_I(dentry->d_inode)->xattr_sem); |
eaeef867 | 506 | return ret; |
ac27a0ec DK |
507 | } |
508 | ||
509 | /* | |
617ba13b | 510 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
511 | * not set, set it. |
512 | */ | |
617ba13b | 513 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
514 | struct super_block *sb) |
515 | { | |
617ba13b | 516 | if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR)) |
ac27a0ec DK |
517 | return; |
518 | ||
5d601255 | 519 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 520 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
ed2908f3 | 521 | EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR); |
a0375156 | 522 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec | 523 | } |
ac27a0ec DK |
524 | } |
525 | ||
526 | /* | |
ec4cb1aa JK |
527 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
528 | * otherwise free the block. | |
ac27a0ec DK |
529 | */ |
530 | static void | |
617ba13b | 531 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
ac27a0ec DK |
532 | struct buffer_head *bh) |
533 | { | |
534 | struct mb_cache_entry *ce = NULL; | |
8a2bfdcb | 535 | int error = 0; |
9c191f70 | 536 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec | 537 | |
9c191f70 | 538 | ce = mb_cache_entry_get(ext4_mb_cache, bh->b_bdev, bh->b_blocknr); |
5d601255 | 539 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
540 | error = ext4_journal_get_write_access(handle, bh); |
541 | if (error) | |
542 | goto out; | |
543 | ||
544 | lock_buffer(bh); | |
ac27a0ec DK |
545 | if (BHDR(bh)->h_refcount == cpu_to_le32(1)) { |
546 | ea_bdebug(bh, "refcount now=0; freeing"); | |
547 | if (ce) | |
548 | mb_cache_entry_free(ce); | |
ac27a0ec | 549 | get_bh(bh); |
ec4cb1aa | 550 | unlock_buffer(bh); |
e6362609 TT |
551 | ext4_free_blocks(handle, inode, bh, 0, 1, |
552 | EXT4_FREE_BLOCKS_METADATA | | |
553 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 554 | } else { |
e8546d06 | 555 | le32_add_cpu(&BHDR(bh)->h_refcount, -1); |
c1bb05a6 ES |
556 | if (ce) |
557 | mb_cache_entry_release(ce); | |
ec4cb1aa JK |
558 | /* |
559 | * Beware of this ugliness: Releasing of xattr block references | |
560 | * from different inodes can race and so we have to protect | |
561 | * from a race where someone else frees the block (and releases | |
562 | * its journal_head) before we are done dirtying the buffer. In | |
563 | * nojournal mode this race is harmless and we actually cannot | |
564 | * call ext4_handle_dirty_xattr_block() with locked buffer as | |
565 | * that function can call sync_dirty_buffer() so for that case | |
566 | * we handle the dirtying after unlocking the buffer. | |
567 | */ | |
568 | if (ext4_handle_valid(handle)) | |
569 | error = ext4_handle_dirty_xattr_block(handle, inode, | |
570 | bh); | |
c1bb05a6 | 571 | unlock_buffer(bh); |
ec4cb1aa JK |
572 | if (!ext4_handle_valid(handle)) |
573 | error = ext4_handle_dirty_xattr_block(handle, inode, | |
574 | bh); | |
8a2bfdcb | 575 | if (IS_SYNC(inode)) |
0390131b | 576 | ext4_handle_sync(handle); |
1231b3a1 | 577 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
578 | ea_bdebug(bh, "refcount now=%d; releasing", |
579 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 580 | } |
8a2bfdcb MC |
581 | out: |
582 | ext4_std_error(inode->i_sb, error); | |
583 | return; | |
ac27a0ec DK |
584 | } |
585 | ||
6dd4ee7c KS |
586 | /* |
587 | * Find the available free space for EAs. This also returns the total number of | |
588 | * bytes used by EA entries. | |
589 | */ | |
590 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
591 | size_t *min_offs, void *base, int *total) | |
592 | { | |
593 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
6dd4ee7c KS |
594 | if (!last->e_value_block && last->e_value_size) { |
595 | size_t offs = le16_to_cpu(last->e_value_offs); | |
596 | if (offs < *min_offs) | |
597 | *min_offs = offs; | |
598 | } | |
7b1b2c1b TT |
599 | if (total) |
600 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
601 | } |
602 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
603 | } | |
604 | ||
ac27a0ec | 605 | static int |
617ba13b | 606 | ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) |
ac27a0ec | 607 | { |
617ba13b | 608 | struct ext4_xattr_entry *last; |
ac27a0ec DK |
609 | size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); |
610 | ||
611 | /* Compute min_offs and last. */ | |
612 | last = s->first; | |
617ba13b | 613 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
ac27a0ec DK |
614 | if (!last->e_value_block && last->e_value_size) { |
615 | size_t offs = le16_to_cpu(last->e_value_offs); | |
616 | if (offs < min_offs) | |
617 | min_offs = offs; | |
618 | } | |
619 | } | |
620 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); | |
621 | if (!s->not_found) { | |
622 | if (!s->here->e_value_block && s->here->e_value_size) { | |
623 | size_t size = le32_to_cpu(s->here->e_value_size); | |
617ba13b | 624 | free += EXT4_XATTR_SIZE(size); |
ac27a0ec | 625 | } |
617ba13b | 626 | free += EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
627 | } |
628 | if (i->value) { | |
617ba13b MC |
629 | if (free < EXT4_XATTR_SIZE(i->value_len) || |
630 | free < EXT4_XATTR_LEN(name_len) + | |
631 | EXT4_XATTR_SIZE(i->value_len)) | |
ac27a0ec DK |
632 | return -ENOSPC; |
633 | } | |
634 | ||
635 | if (i->value && s->not_found) { | |
636 | /* Insert the new name. */ | |
617ba13b | 637 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
638 | size_t rest = (void *)last - (void *)s->here + sizeof(__u32); |
639 | memmove((void *)s->here + size, s->here, rest); | |
640 | memset(s->here, 0, size); | |
641 | s->here->e_name_index = i->name_index; | |
642 | s->here->e_name_len = name_len; | |
643 | memcpy(s->here->e_name, i->name, name_len); | |
644 | } else { | |
645 | if (!s->here->e_value_block && s->here->e_value_size) { | |
646 | void *first_val = s->base + min_offs; | |
647 | size_t offs = le16_to_cpu(s->here->e_value_offs); | |
648 | void *val = s->base + offs; | |
617ba13b | 649 | size_t size = EXT4_XATTR_SIZE( |
ac27a0ec DK |
650 | le32_to_cpu(s->here->e_value_size)); |
651 | ||
617ba13b | 652 | if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { |
ac27a0ec DK |
653 | /* The old and the new value have the same |
654 | size. Just replace. */ | |
655 | s->here->e_value_size = | |
656 | cpu_to_le32(i->value_len); | |
bd9926e8 TT |
657 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
658 | memset(val, 0, size); | |
659 | } else { | |
660 | /* Clear pad bytes first. */ | |
661 | memset(val + size - EXT4_XATTR_PAD, 0, | |
662 | EXT4_XATTR_PAD); | |
663 | memcpy(val, i->value, i->value_len); | |
664 | } | |
ac27a0ec DK |
665 | return 0; |
666 | } | |
667 | ||
668 | /* Remove the old value. */ | |
669 | memmove(first_val + size, first_val, val - first_val); | |
670 | memset(first_val, 0, size); | |
671 | s->here->e_value_size = 0; | |
672 | s->here->e_value_offs = 0; | |
673 | min_offs += size; | |
674 | ||
675 | /* Adjust all value offsets. */ | |
676 | last = s->first; | |
677 | while (!IS_LAST_ENTRY(last)) { | |
678 | size_t o = le16_to_cpu(last->e_value_offs); | |
679 | if (!last->e_value_block && | |
680 | last->e_value_size && o < offs) | |
681 | last->e_value_offs = | |
682 | cpu_to_le16(o + size); | |
617ba13b | 683 | last = EXT4_XATTR_NEXT(last); |
ac27a0ec DK |
684 | } |
685 | } | |
686 | if (!i->value) { | |
687 | /* Remove the old name. */ | |
617ba13b | 688 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
689 | last = ENTRY((void *)last - size); |
690 | memmove(s->here, (void *)s->here + size, | |
691 | (void *)last - (void *)s->here + sizeof(__u32)); | |
692 | memset(last, 0, size); | |
693 | } | |
694 | } | |
695 | ||
696 | if (i->value) { | |
697 | /* Insert the new value. */ | |
698 | s->here->e_value_size = cpu_to_le32(i->value_len); | |
699 | if (i->value_len) { | |
617ba13b | 700 | size_t size = EXT4_XATTR_SIZE(i->value_len); |
ac27a0ec DK |
701 | void *val = s->base + min_offs - size; |
702 | s->here->e_value_offs = cpu_to_le16(min_offs - size); | |
bd9926e8 TT |
703 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
704 | memset(val, 0, size); | |
705 | } else { | |
706 | /* Clear the pad bytes first. */ | |
707 | memset(val + size - EXT4_XATTR_PAD, 0, | |
708 | EXT4_XATTR_PAD); | |
709 | memcpy(val, i->value, i->value_len); | |
710 | } | |
ac27a0ec DK |
711 | } |
712 | } | |
713 | return 0; | |
714 | } | |
715 | ||
617ba13b MC |
716 | struct ext4_xattr_block_find { |
717 | struct ext4_xattr_search s; | |
ac27a0ec DK |
718 | struct buffer_head *bh; |
719 | }; | |
720 | ||
721 | static int | |
617ba13b MC |
722 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
723 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
724 | { |
725 | struct super_block *sb = inode->i_sb; | |
726 | int error; | |
727 | ||
728 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
729 | i->name_index, i->name, i->value, (long)i->value_len); | |
730 | ||
617ba13b | 731 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 732 | /* The inode already has an extended attribute block. */ |
617ba13b | 733 | bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
734 | error = -EIO; |
735 | if (!bs->bh) | |
736 | goto cleanup; | |
737 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", | |
738 | atomic_read(&(bs->bh->b_count)), | |
739 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
cc8e94fd | 740 | if (ext4_xattr_check_block(inode, bs->bh)) { |
24676da4 TT |
741 | EXT4_ERROR_INODE(inode, "bad block %llu", |
742 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
743 | error = -EIO; |
744 | goto cleanup; | |
745 | } | |
746 | /* Find the named attribute. */ | |
747 | bs->s.base = BHDR(bs->bh); | |
748 | bs->s.first = BFIRST(bs->bh); | |
749 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
750 | bs->s.here = bs->s.first; | |
617ba13b | 751 | error = ext4_xattr_find_entry(&bs->s.here, i->name_index, |
ac27a0ec DK |
752 | i->name, bs->bh->b_size, 1); |
753 | if (error && error != -ENODATA) | |
754 | goto cleanup; | |
755 | bs->s.not_found = error; | |
756 | } | |
757 | error = 0; | |
758 | ||
759 | cleanup: | |
760 | return error; | |
761 | } | |
762 | ||
763 | static int | |
617ba13b MC |
764 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
765 | struct ext4_xattr_info *i, | |
766 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
767 | { |
768 | struct super_block *sb = inode->i_sb; | |
769 | struct buffer_head *new_bh = NULL; | |
617ba13b | 770 | struct ext4_xattr_search *s = &bs->s; |
ac27a0ec | 771 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 772 | int error = 0; |
9c191f70 | 773 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec | 774 | |
617ba13b | 775 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec DK |
776 | |
777 | if (i->value && i->value_len > sb->s_blocksize) | |
778 | return -ENOSPC; | |
779 | if (s->base) { | |
9c191f70 | 780 | ce = mb_cache_entry_get(ext4_mb_cache, bs->bh->b_bdev, |
ac27a0ec | 781 | bs->bh->b_blocknr); |
5d601255 | 782 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
783 | error = ext4_journal_get_write_access(handle, bs->bh); |
784 | if (error) | |
785 | goto cleanup; | |
786 | lock_buffer(bs->bh); | |
787 | ||
ac27a0ec DK |
788 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
789 | if (ce) { | |
790 | mb_cache_entry_free(ce); | |
791 | ce = NULL; | |
792 | } | |
793 | ea_bdebug(bs->bh, "modifying in-place"); | |
617ba13b | 794 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
795 | if (!error) { |
796 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 797 | ext4_xattr_rehash(header(s->base), |
ac27a0ec | 798 | s->here); |
9c191f70 M |
799 | ext4_xattr_cache_insert(ext4_mb_cache, |
800 | bs->bh); | |
ac27a0ec DK |
801 | } |
802 | unlock_buffer(bs->bh); | |
803 | if (error == -EIO) | |
804 | goto bad_block; | |
805 | if (!error) | |
cc8e94fd DW |
806 | error = ext4_handle_dirty_xattr_block(handle, |
807 | inode, | |
808 | bs->bh); | |
ac27a0ec DK |
809 | if (error) |
810 | goto cleanup; | |
811 | goto inserted; | |
812 | } else { | |
813 | int offset = (char *)s->here - bs->bh->b_data; | |
814 | ||
8a2bfdcb | 815 | unlock_buffer(bs->bh); |
ac27a0ec DK |
816 | if (ce) { |
817 | mb_cache_entry_release(ce); | |
818 | ce = NULL; | |
819 | } | |
820 | ea_bdebug(bs->bh, "cloning"); | |
216553c4 | 821 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
822 | error = -ENOMEM; |
823 | if (s->base == NULL) | |
824 | goto cleanup; | |
825 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
826 | s->first = ENTRY(header(s->base)+1); | |
827 | header(s->base)->h_refcount = cpu_to_le32(1); | |
828 | s->here = ENTRY(s->base + offset); | |
829 | s->end = s->base + bs->bh->b_size; | |
830 | } | |
831 | } else { | |
832 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 833 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
834 | /* assert(header == s->base) */ |
835 | error = -ENOMEM; | |
836 | if (s->base == NULL) | |
837 | goto cleanup; | |
617ba13b | 838 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
839 | header(s->base)->h_blocks = cpu_to_le32(1); |
840 | header(s->base)->h_refcount = cpu_to_le32(1); | |
841 | s->first = ENTRY(header(s->base)+1); | |
842 | s->here = ENTRY(header(s->base)+1); | |
843 | s->end = s->base + sb->s_blocksize; | |
844 | } | |
845 | ||
617ba13b | 846 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
847 | if (error == -EIO) |
848 | goto bad_block; | |
849 | if (error) | |
850 | goto cleanup; | |
851 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 852 | ext4_xattr_rehash(header(s->base), s->here); |
ac27a0ec DK |
853 | |
854 | inserted: | |
855 | if (!IS_LAST_ENTRY(s->first)) { | |
617ba13b | 856 | new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); |
ac27a0ec DK |
857 | if (new_bh) { |
858 | /* We found an identical block in the cache. */ | |
859 | if (new_bh == bs->bh) | |
860 | ea_bdebug(new_bh, "keeping"); | |
861 | else { | |
862 | /* The old block is released after updating | |
863 | the inode. */ | |
1231b3a1 LC |
864 | error = dquot_alloc_block(inode, |
865 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 866 | if (error) |
ac27a0ec | 867 | goto cleanup; |
5d601255 | 868 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 869 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
870 | new_bh); |
871 | if (error) | |
872 | goto cleanup_dquot; | |
873 | lock_buffer(new_bh); | |
e8546d06 | 874 | le32_add_cpu(&BHDR(new_bh)->h_refcount, 1); |
ac27a0ec DK |
875 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
876 | le32_to_cpu(BHDR(new_bh)->h_refcount)); | |
877 | unlock_buffer(new_bh); | |
cc8e94fd DW |
878 | error = ext4_handle_dirty_xattr_block(handle, |
879 | inode, | |
880 | new_bh); | |
ac27a0ec DK |
881 | if (error) |
882 | goto cleanup_dquot; | |
883 | } | |
884 | mb_cache_entry_release(ce); | |
885 | ce = NULL; | |
886 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
887 | /* We were modifying this block in-place. */ | |
888 | ea_bdebug(bs->bh, "keeping this block"); | |
889 | new_bh = bs->bh; | |
890 | get_bh(new_bh); | |
891 | } else { | |
892 | /* We need to allocate a new block */ | |
fb0a387d ES |
893 | ext4_fsblk_t goal, block; |
894 | ||
895 | goal = ext4_group_first_block_no(sb, | |
d00a6d7b | 896 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
897 | |
898 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 899 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
900 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
901 | ||
6d6a4351 ES |
902 | /* |
903 | * take i_data_sem because we will test | |
904 | * i_delalloc_reserved_flag in ext4_mb_new_blocks | |
905 | */ | |
c8b459f4 | 906 | down_read(&EXT4_I(inode)->i_data_sem); |
55f020db AH |
907 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
908 | NULL, &error); | |
6d6a4351 | 909 | up_read((&EXT4_I(inode)->i_data_sem)); |
ac27a0ec DK |
910 | if (error) |
911 | goto cleanup; | |
fb0a387d | 912 | |
12e9b892 | 913 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
914 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
915 | ||
ace36ad4 JP |
916 | ea_idebug(inode, "creating block %llu", |
917 | (unsigned long long)block); | |
ac27a0ec DK |
918 | |
919 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 920 | if (unlikely(!new_bh)) { |
860d21e2 | 921 | error = -ENOMEM; |
ac27a0ec | 922 | getblk_failed: |
7dc57615 | 923 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 924 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
925 | goto cleanup; |
926 | } | |
927 | lock_buffer(new_bh); | |
617ba13b | 928 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
929 | if (error) { |
930 | unlock_buffer(new_bh); | |
860d21e2 | 931 | error = -EIO; |
ac27a0ec DK |
932 | goto getblk_failed; |
933 | } | |
934 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
935 | set_buffer_uptodate(new_bh); | |
936 | unlock_buffer(new_bh); | |
9c191f70 | 937 | ext4_xattr_cache_insert(ext4_mb_cache, new_bh); |
cc8e94fd DW |
938 | error = ext4_handle_dirty_xattr_block(handle, |
939 | inode, new_bh); | |
ac27a0ec DK |
940 | if (error) |
941 | goto cleanup; | |
942 | } | |
943 | } | |
944 | ||
945 | /* Update the inode. */ | |
617ba13b | 946 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
947 | |
948 | /* Drop the previous xattr block. */ | |
949 | if (bs->bh && bs->bh != new_bh) | |
617ba13b | 950 | ext4_xattr_release_block(handle, inode, bs->bh); |
ac27a0ec DK |
951 | error = 0; |
952 | ||
953 | cleanup: | |
954 | if (ce) | |
955 | mb_cache_entry_release(ce); | |
956 | brelse(new_bh); | |
957 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
958 | kfree(s->base); | |
959 | ||
960 | return error; | |
961 | ||
962 | cleanup_dquot: | |
1231b3a1 | 963 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
964 | goto cleanup; |
965 | ||
966 | bad_block: | |
24676da4 TT |
967 | EXT4_ERROR_INODE(inode, "bad block %llu", |
968 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
969 | goto cleanup; |
970 | ||
971 | #undef header | |
972 | } | |
973 | ||
879b3825 TM |
974 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
975 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 976 | { |
617ba13b MC |
977 | struct ext4_xattr_ibody_header *header; |
978 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
979 | int error; |
980 | ||
617ba13b | 981 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 982 | return 0; |
617ba13b | 983 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
984 | header = IHDR(inode, raw_inode); |
985 | is->s.base = is->s.first = IFIRST(header); | |
986 | is->s.here = is->s.first; | |
617ba13b | 987 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 988 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
617ba13b | 989 | error = ext4_xattr_check_names(IFIRST(header), is->s.end); |
ac27a0ec DK |
990 | if (error) |
991 | return error; | |
992 | /* Find the named attribute. */ | |
617ba13b | 993 | error = ext4_xattr_find_entry(&is->s.here, i->name_index, |
ac27a0ec DK |
994 | i->name, is->s.end - |
995 | (void *)is->s.base, 0); | |
996 | if (error && error != -ENODATA) | |
997 | return error; | |
998 | is->s.not_found = error; | |
999 | } | |
1000 | return 0; | |
1001 | } | |
1002 | ||
0d812f77 TM |
1003 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
1004 | struct ext4_xattr_info *i, | |
1005 | struct ext4_xattr_ibody_find *is) | |
1006 | { | |
1007 | struct ext4_xattr_ibody_header *header; | |
1008 | struct ext4_xattr_search *s = &is->s; | |
1009 | int error; | |
1010 | ||
1011 | if (EXT4_I(inode)->i_extra_isize == 0) | |
1012 | return -ENOSPC; | |
1013 | error = ext4_xattr_set_entry(i, s); | |
1014 | if (error) { | |
1015 | if (error == -ENOSPC && | |
1016 | ext4_has_inline_data(inode)) { | |
1017 | error = ext4_try_to_evict_inline_data(handle, inode, | |
1018 | EXT4_XATTR_LEN(strlen(i->name) + | |
1019 | EXT4_XATTR_SIZE(i->value_len))); | |
1020 | if (error) | |
1021 | return error; | |
1022 | error = ext4_xattr_ibody_find(inode, i, is); | |
1023 | if (error) | |
1024 | return error; | |
1025 | error = ext4_xattr_set_entry(i, s); | |
1026 | } | |
1027 | if (error) | |
1028 | return error; | |
1029 | } | |
1030 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); | |
1031 | if (!IS_LAST_ENTRY(s->first)) { | |
1032 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
1033 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
1034 | } else { | |
1035 | header->h_magic = cpu_to_le32(0); | |
1036 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
1037 | } | |
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, | |
1042 | struct ext4_xattr_info *i, | |
1043 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 1044 | { |
617ba13b MC |
1045 | struct ext4_xattr_ibody_header *header; |
1046 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
1047 | int error; |
1048 | ||
617ba13b | 1049 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1050 | return -ENOSPC; |
617ba13b | 1051 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
1052 | if (error) |
1053 | return error; | |
617ba13b | 1054 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 1055 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 1056 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 1057 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1058 | } else { |
1059 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 1060 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1061 | } |
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | /* | |
617ba13b | 1066 | * ext4_xattr_set_handle() |
ac27a0ec | 1067 | * |
6e9510b0 | 1068 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
1069 | * is NULL to remove an existing extended attribute, and non-NULL to |
1070 | * either replace an existing extended attribute, or create a new extended | |
1071 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
1072 | * specify that an extended attribute must exist and must not exist | |
1073 | * previous to the call, respectively. | |
1074 | * | |
1075 | * Returns 0, or a negative error number on failure. | |
1076 | */ | |
1077 | int | |
617ba13b | 1078 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
1079 | const char *name, const void *value, size_t value_len, |
1080 | int flags) | |
1081 | { | |
617ba13b | 1082 | struct ext4_xattr_info i = { |
ac27a0ec DK |
1083 | .name_index = name_index, |
1084 | .name = name, | |
1085 | .value = value, | |
1086 | .value_len = value_len, | |
1087 | ||
1088 | }; | |
617ba13b | 1089 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
1090 | .s = { .not_found = -ENODATA, }, |
1091 | }; | |
617ba13b | 1092 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
1093 | .s = { .not_found = -ENODATA, }, |
1094 | }; | |
4d20c685 | 1095 | unsigned long no_expand; |
ac27a0ec DK |
1096 | int error; |
1097 | ||
1098 | if (!name) | |
1099 | return -EINVAL; | |
1100 | if (strlen(name) > 255) | |
1101 | return -ERANGE; | |
617ba13b | 1102 | down_write(&EXT4_I(inode)->xattr_sem); |
19f5fb7a TT |
1103 | no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); |
1104 | ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); | |
4d20c685 | 1105 | |
66543617 | 1106 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
1107 | if (error) |
1108 | goto cleanup; | |
1109 | ||
19f5fb7a | 1110 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
1111 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
1112 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 1113 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
1114 | } |
1115 | ||
617ba13b | 1116 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
1117 | if (error) |
1118 | goto cleanup; | |
1119 | if (is.s.not_found) | |
617ba13b | 1120 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
1121 | if (error) |
1122 | goto cleanup; | |
1123 | if (is.s.not_found && bs.s.not_found) { | |
1124 | error = -ENODATA; | |
1125 | if (flags & XATTR_REPLACE) | |
1126 | goto cleanup; | |
1127 | error = 0; | |
1128 | if (!value) | |
1129 | goto cleanup; | |
1130 | } else { | |
1131 | error = -EEXIST; | |
1132 | if (flags & XATTR_CREATE) | |
1133 | goto cleanup; | |
1134 | } | |
ac27a0ec DK |
1135 | if (!value) { |
1136 | if (!is.s.not_found) | |
617ba13b | 1137 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 1138 | else if (!bs.s.not_found) |
617ba13b | 1139 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1140 | } else { |
617ba13b | 1141 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
1142 | if (!error && !bs.s.not_found) { |
1143 | i.value = NULL; | |
617ba13b | 1144 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1145 | } else if (error == -ENOSPC) { |
7e01c8e5 TY |
1146 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
1147 | error = ext4_xattr_block_find(inode, &i, &bs); | |
1148 | if (error) | |
1149 | goto cleanup; | |
1150 | } | |
617ba13b | 1151 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec DK |
1152 | if (error) |
1153 | goto cleanup; | |
1154 | if (!is.s.not_found) { | |
1155 | i.value = NULL; | |
617ba13b | 1156 | error = ext4_xattr_ibody_set(handle, inode, &i, |
ac27a0ec DK |
1157 | &is); |
1158 | } | |
1159 | } | |
1160 | } | |
1161 | if (!error) { | |
617ba13b | 1162 | ext4_xattr_update_super_block(handle, inode->i_sb); |
ef7f3835 | 1163 | inode->i_ctime = ext4_current_time(inode); |
6dd4ee7c | 1164 | if (!value) |
19f5fb7a | 1165 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
617ba13b | 1166 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 1167 | /* |
617ba13b | 1168 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
1169 | * error != 0. |
1170 | */ | |
1171 | is.iloc.bh = NULL; | |
1172 | if (IS_SYNC(inode)) | |
0390131b | 1173 | ext4_handle_sync(handle); |
ac27a0ec DK |
1174 | } |
1175 | ||
1176 | cleanup: | |
1177 | brelse(is.iloc.bh); | |
1178 | brelse(bs.bh); | |
4d20c685 | 1179 | if (no_expand == 0) |
19f5fb7a | 1180 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
617ba13b | 1181 | up_write(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
1182 | return error; |
1183 | } | |
1184 | ||
1185 | /* | |
617ba13b | 1186 | * ext4_xattr_set() |
ac27a0ec | 1187 | * |
617ba13b | 1188 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
1189 | * attribute modification is a filesystem transaction by itself. |
1190 | * | |
1191 | * Returns 0, or a negative error number on failure. | |
1192 | */ | |
1193 | int | |
617ba13b | 1194 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
1195 | const void *value, size_t value_len, int flags) |
1196 | { | |
1197 | handle_t *handle; | |
1198 | int error, retries = 0; | |
95eaefbd | 1199 | int credits = ext4_jbd2_credits_xattr(inode); |
ac27a0ec DK |
1200 | |
1201 | retry: | |
9924a92a | 1202 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
1203 | if (IS_ERR(handle)) { |
1204 | error = PTR_ERR(handle); | |
1205 | } else { | |
1206 | int error2; | |
1207 | ||
617ba13b | 1208 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 1209 | value, value_len, flags); |
617ba13b | 1210 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 1211 | if (error == -ENOSPC && |
617ba13b | 1212 | ext4_should_retry_alloc(inode->i_sb, &retries)) |
ac27a0ec DK |
1213 | goto retry; |
1214 | if (error == 0) | |
1215 | error = error2; | |
1216 | } | |
1217 | ||
1218 | return error; | |
1219 | } | |
1220 | ||
6dd4ee7c KS |
1221 | /* |
1222 | * Shift the EA entries in the inode to create space for the increased | |
1223 | * i_extra_isize. | |
1224 | */ | |
1225 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
1226 | int value_offs_shift, void *to, | |
1227 | void *from, size_t n, int blocksize) | |
1228 | { | |
1229 | struct ext4_xattr_entry *last = entry; | |
1230 | int new_offs; | |
1231 | ||
1232 | /* Adjust the value offsets of the entries */ | |
1233 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1234 | if (!last->e_value_block && last->e_value_size) { | |
1235 | new_offs = le16_to_cpu(last->e_value_offs) + | |
1236 | value_offs_shift; | |
1237 | BUG_ON(new_offs + le32_to_cpu(last->e_value_size) | |
1238 | > blocksize); | |
1239 | last->e_value_offs = cpu_to_le16(new_offs); | |
1240 | } | |
1241 | } | |
1242 | /* Shift the entries by n bytes */ | |
1243 | memmove(to, from, n); | |
1244 | } | |
1245 | ||
1246 | /* | |
1247 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
1248 | * Returns 0 on success or negative error number on failure. | |
1249 | */ | |
1250 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
1251 | struct ext4_inode *raw_inode, handle_t *handle) | |
1252 | { | |
1253 | struct ext4_xattr_ibody_header *header; | |
1254 | struct ext4_xattr_entry *entry, *last, *first; | |
1255 | struct buffer_head *bh = NULL; | |
1256 | struct ext4_xattr_ibody_find *is = NULL; | |
1257 | struct ext4_xattr_block_find *bs = NULL; | |
1258 | char *buffer = NULL, *b_entry_name = NULL; | |
1259 | size_t min_offs, free; | |
7b1b2c1b | 1260 | int total_ino; |
6dd4ee7c KS |
1261 | void *base, *start, *end; |
1262 | int extra_isize = 0, error = 0, tried_min_extra_isize = 0; | |
ac39849d | 1263 | int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); |
6dd4ee7c KS |
1264 | |
1265 | down_write(&EXT4_I(inode)->xattr_sem); | |
1266 | retry: | |
1267 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { | |
1268 | up_write(&EXT4_I(inode)->xattr_sem); | |
1269 | return 0; | |
1270 | } | |
1271 | ||
1272 | header = IHDR(inode, raw_inode); | |
1273 | entry = IFIRST(header); | |
1274 | ||
1275 | /* | |
1276 | * Check if enough free space is available in the inode to shift the | |
1277 | * entries ahead by new_extra_isize. | |
1278 | */ | |
1279 | ||
1280 | base = start = entry; | |
1281 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
1282 | min_offs = end - base; | |
1283 | last = entry; | |
1284 | total_ino = sizeof(struct ext4_xattr_ibody_header); | |
1285 | ||
1286 | free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); | |
1287 | if (free >= new_extra_isize) { | |
1288 | entry = IFIRST(header); | |
1289 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize | |
1290 | - new_extra_isize, (void *)raw_inode + | |
1291 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
1292 | (void *)header, total_ino, | |
1293 | inode->i_sb->s_blocksize); | |
1294 | EXT4_I(inode)->i_extra_isize = new_extra_isize; | |
1295 | error = 0; | |
1296 | goto cleanup; | |
1297 | } | |
1298 | ||
1299 | /* | |
1300 | * Enough free space isn't available in the inode, check if | |
1301 | * EA block can hold new_extra_isize bytes. | |
1302 | */ | |
1303 | if (EXT4_I(inode)->i_file_acl) { | |
1304 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
1305 | error = -EIO; | |
1306 | if (!bh) | |
1307 | goto cleanup; | |
cc8e94fd | 1308 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
1309 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1310 | EXT4_I(inode)->i_file_acl); | |
6dd4ee7c KS |
1311 | error = -EIO; |
1312 | goto cleanup; | |
1313 | } | |
1314 | base = BHDR(bh); | |
1315 | first = BFIRST(bh); | |
1316 | end = bh->b_data + bh->b_size; | |
1317 | min_offs = end - base; | |
7b1b2c1b | 1318 | free = ext4_xattr_free_space(first, &min_offs, base, NULL); |
6dd4ee7c KS |
1319 | if (free < new_extra_isize) { |
1320 | if (!tried_min_extra_isize && s_min_extra_isize) { | |
1321 | tried_min_extra_isize++; | |
1322 | new_extra_isize = s_min_extra_isize; | |
1323 | brelse(bh); | |
1324 | goto retry; | |
1325 | } | |
1326 | error = -1; | |
1327 | goto cleanup; | |
1328 | } | |
1329 | } else { | |
1330 | free = inode->i_sb->s_blocksize; | |
1331 | } | |
1332 | ||
1333 | while (new_extra_isize > 0) { | |
1334 | size_t offs, size, entry_size; | |
1335 | struct ext4_xattr_entry *small_entry = NULL; | |
1336 | struct ext4_xattr_info i = { | |
1337 | .value = NULL, | |
1338 | .value_len = 0, | |
1339 | }; | |
1340 | unsigned int total_size; /* EA entry size + value size */ | |
1341 | unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ | |
1342 | unsigned int min_total_size = ~0U; | |
1343 | ||
1344 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); | |
1345 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
1346 | if (!is || !bs) { | |
1347 | error = -ENOMEM; | |
1348 | goto cleanup; | |
1349 | } | |
1350 | ||
1351 | is->s.not_found = -ENODATA; | |
1352 | bs->s.not_found = -ENODATA; | |
1353 | is->iloc.bh = NULL; | |
1354 | bs->bh = NULL; | |
1355 | ||
1356 | last = IFIRST(header); | |
1357 | /* Find the entry best suited to be pushed into EA block */ | |
1358 | entry = NULL; | |
1359 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1360 | total_size = | |
1361 | EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + | |
1362 | EXT4_XATTR_LEN(last->e_name_len); | |
1363 | if (total_size <= free && total_size < min_total_size) { | |
1364 | if (total_size < new_extra_isize) { | |
1365 | small_entry = last; | |
1366 | } else { | |
1367 | entry = last; | |
1368 | min_total_size = total_size; | |
1369 | } | |
1370 | } | |
1371 | } | |
1372 | ||
1373 | if (entry == NULL) { | |
1374 | if (small_entry) { | |
1375 | entry = small_entry; | |
1376 | } else { | |
1377 | if (!tried_min_extra_isize && | |
1378 | s_min_extra_isize) { | |
1379 | tried_min_extra_isize++; | |
1380 | new_extra_isize = s_min_extra_isize; | |
6e4ea8e3 DJ |
1381 | kfree(is); is = NULL; |
1382 | kfree(bs); bs = NULL; | |
dcb9917b | 1383 | brelse(bh); |
6dd4ee7c KS |
1384 | goto retry; |
1385 | } | |
1386 | error = -1; | |
1387 | goto cleanup; | |
1388 | } | |
1389 | } | |
1390 | offs = le16_to_cpu(entry->e_value_offs); | |
1391 | size = le32_to_cpu(entry->e_value_size); | |
1392 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
1393 | i.name_index = entry->e_name_index, | |
1394 | buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); | |
1395 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
1396 | if (!buffer || !b_entry_name) { | |
1397 | error = -ENOMEM; | |
1398 | goto cleanup; | |
1399 | } | |
1400 | /* Save the entry name and the entry value */ | |
1401 | memcpy(buffer, (void *)IFIRST(header) + offs, | |
1402 | EXT4_XATTR_SIZE(size)); | |
1403 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); | |
1404 | b_entry_name[entry->e_name_len] = '\0'; | |
1405 | i.name = b_entry_name; | |
1406 | ||
1407 | error = ext4_get_inode_loc(inode, &is->iloc); | |
1408 | if (error) | |
1409 | goto cleanup; | |
1410 | ||
1411 | error = ext4_xattr_ibody_find(inode, &i, is); | |
1412 | if (error) | |
1413 | goto cleanup; | |
1414 | ||
1415 | /* Remove the chosen entry from the inode */ | |
1416 | error = ext4_xattr_ibody_set(handle, inode, &i, is); | |
9aaab058 RK |
1417 | if (error) |
1418 | goto cleanup; | |
6dd4ee7c KS |
1419 | |
1420 | entry = IFIRST(header); | |
1421 | if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) | |
1422 | shift_bytes = new_extra_isize; | |
1423 | else | |
1424 | shift_bytes = entry_size + size; | |
1425 | /* Adjust the offsets and shift the remaining entries ahead */ | |
1426 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - | |
1427 | shift_bytes, (void *)raw_inode + | |
1428 | EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, | |
1429 | (void *)header, total_ino - entry_size, | |
1430 | inode->i_sb->s_blocksize); | |
1431 | ||
1432 | extra_isize += shift_bytes; | |
1433 | new_extra_isize -= shift_bytes; | |
1434 | EXT4_I(inode)->i_extra_isize = extra_isize; | |
1435 | ||
1436 | i.name = b_entry_name; | |
1437 | i.value = buffer; | |
ac39849d | 1438 | i.value_len = size; |
6dd4ee7c KS |
1439 | error = ext4_xattr_block_find(inode, &i, bs); |
1440 | if (error) | |
1441 | goto cleanup; | |
1442 | ||
1443 | /* Add entry which was removed from the inode into the block */ | |
1444 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
1445 | if (error) | |
1446 | goto cleanup; | |
1447 | kfree(b_entry_name); | |
1448 | kfree(buffer); | |
d3533d72 JL |
1449 | b_entry_name = NULL; |
1450 | buffer = NULL; | |
6dd4ee7c KS |
1451 | brelse(is->iloc.bh); |
1452 | kfree(is); | |
1453 | kfree(bs); | |
1454 | } | |
1455 | brelse(bh); | |
1456 | up_write(&EXT4_I(inode)->xattr_sem); | |
1457 | return 0; | |
1458 | ||
1459 | cleanup: | |
1460 | kfree(b_entry_name); | |
1461 | kfree(buffer); | |
1462 | if (is) | |
1463 | brelse(is->iloc.bh); | |
1464 | kfree(is); | |
1465 | kfree(bs); | |
1466 | brelse(bh); | |
1467 | up_write(&EXT4_I(inode)->xattr_sem); | |
1468 | return error; | |
1469 | } | |
1470 | ||
1471 | ||
1472 | ||
ac27a0ec | 1473 | /* |
617ba13b | 1474 | * ext4_xattr_delete_inode() |
ac27a0ec DK |
1475 | * |
1476 | * Free extended attribute resources associated with this inode. This | |
1477 | * is called immediately before an inode is freed. We have exclusive | |
1478 | * access to the inode. | |
1479 | */ | |
1480 | void | |
617ba13b | 1481 | ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
1482 | { |
1483 | struct buffer_head *bh = NULL; | |
1484 | ||
617ba13b | 1485 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 1486 | goto cleanup; |
617ba13b | 1487 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec | 1488 | if (!bh) { |
24676da4 TT |
1489 | EXT4_ERROR_INODE(inode, "block %llu read error", |
1490 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1491 | goto cleanup; |
1492 | } | |
617ba13b | 1493 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 1494 | BHDR(bh)->h_blocks != cpu_to_le32(1)) { |
24676da4 TT |
1495 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1496 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1497 | goto cleanup; |
1498 | } | |
617ba13b MC |
1499 | ext4_xattr_release_block(handle, inode, bh); |
1500 | EXT4_I(inode)->i_file_acl = 0; | |
ac27a0ec DK |
1501 | |
1502 | cleanup: | |
1503 | brelse(bh); | |
1504 | } | |
1505 | ||
1506 | /* | |
617ba13b | 1507 | * ext4_xattr_put_super() |
ac27a0ec DK |
1508 | * |
1509 | * This is called when a file system is unmounted. | |
1510 | */ | |
1511 | void | |
617ba13b | 1512 | ext4_xattr_put_super(struct super_block *sb) |
ac27a0ec DK |
1513 | { |
1514 | mb_cache_shrink(sb->s_bdev); | |
1515 | } | |
1516 | ||
1517 | /* | |
617ba13b | 1518 | * ext4_xattr_cache_insert() |
ac27a0ec DK |
1519 | * |
1520 | * Create a new entry in the extended attribute cache, and insert | |
1521 | * it unless such an entry is already in the cache. | |
1522 | * | |
1523 | * Returns 0, or a negative error number on failure. | |
1524 | */ | |
1525 | static void | |
9c191f70 | 1526 | ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) |
ac27a0ec DK |
1527 | { |
1528 | __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); | |
1529 | struct mb_cache_entry *ce; | |
1530 | int error; | |
1531 | ||
9c191f70 | 1532 | ce = mb_cache_entry_alloc(ext4_mb_cache, GFP_NOFS); |
ac27a0ec DK |
1533 | if (!ce) { |
1534 | ea_bdebug(bh, "out of memory"); | |
1535 | return; | |
1536 | } | |
2aec7c52 | 1537 | error = mb_cache_entry_insert(ce, bh->b_bdev, bh->b_blocknr, hash); |
ac27a0ec DK |
1538 | if (error) { |
1539 | mb_cache_entry_free(ce); | |
1540 | if (error == -EBUSY) { | |
1541 | ea_bdebug(bh, "already in cache"); | |
1542 | error = 0; | |
1543 | } | |
1544 | } else { | |
1545 | ea_bdebug(bh, "inserting [%x]", (int)hash); | |
1546 | mb_cache_entry_release(ce); | |
1547 | } | |
1548 | } | |
1549 | ||
1550 | /* | |
617ba13b | 1551 | * ext4_xattr_cmp() |
ac27a0ec DK |
1552 | * |
1553 | * Compare two extended attribute blocks for equality. | |
1554 | * | |
1555 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
1556 | * a negative error number on errors. | |
1557 | */ | |
1558 | static int | |
617ba13b MC |
1559 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
1560 | struct ext4_xattr_header *header2) | |
ac27a0ec | 1561 | { |
617ba13b | 1562 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
1563 | |
1564 | entry1 = ENTRY(header1+1); | |
1565 | entry2 = ENTRY(header2+1); | |
1566 | while (!IS_LAST_ENTRY(entry1)) { | |
1567 | if (IS_LAST_ENTRY(entry2)) | |
1568 | return 1; | |
1569 | if (entry1->e_hash != entry2->e_hash || | |
1570 | entry1->e_name_index != entry2->e_name_index || | |
1571 | entry1->e_name_len != entry2->e_name_len || | |
1572 | entry1->e_value_size != entry2->e_value_size || | |
1573 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) | |
1574 | return 1; | |
1575 | if (entry1->e_value_block != 0 || entry2->e_value_block != 0) | |
1576 | return -EIO; | |
1577 | if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), | |
1578 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), | |
1579 | le32_to_cpu(entry1->e_value_size))) | |
1580 | return 1; | |
1581 | ||
617ba13b MC |
1582 | entry1 = EXT4_XATTR_NEXT(entry1); |
1583 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
1584 | } |
1585 | if (!IS_LAST_ENTRY(entry2)) | |
1586 | return 1; | |
1587 | return 0; | |
1588 | } | |
1589 | ||
1590 | /* | |
617ba13b | 1591 | * ext4_xattr_cache_find() |
ac27a0ec DK |
1592 | * |
1593 | * Find an identical extended attribute block. | |
1594 | * | |
1595 | * Returns a pointer to the block found, or NULL if such a block was | |
1596 | * not found or an error occurred. | |
1597 | */ | |
1598 | static struct buffer_head * | |
617ba13b | 1599 | ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, |
ac27a0ec DK |
1600 | struct mb_cache_entry **pce) |
1601 | { | |
1602 | __u32 hash = le32_to_cpu(header->h_hash); | |
1603 | struct mb_cache_entry *ce; | |
9c191f70 | 1604 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
1605 | |
1606 | if (!header->h_hash) | |
1607 | return NULL; /* never share */ | |
1608 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
1609 | again: | |
9c191f70 | 1610 | ce = mb_cache_entry_find_first(ext4_mb_cache, inode->i_sb->s_bdev, |
2aec7c52 | 1611 | hash); |
ac27a0ec DK |
1612 | while (ce) { |
1613 | struct buffer_head *bh; | |
1614 | ||
1615 | if (IS_ERR(ce)) { | |
1616 | if (PTR_ERR(ce) == -EAGAIN) | |
1617 | goto again; | |
1618 | break; | |
1619 | } | |
1620 | bh = sb_bread(inode->i_sb, ce->e_block); | |
1621 | if (!bh) { | |
24676da4 TT |
1622 | EXT4_ERROR_INODE(inode, "block %lu read error", |
1623 | (unsigned long) ce->e_block); | |
ac27a0ec | 1624 | } else if (le32_to_cpu(BHDR(bh)->h_refcount) >= |
617ba13b | 1625 | EXT4_XATTR_REFCOUNT_MAX) { |
ac27a0ec DK |
1626 | ea_idebug(inode, "block %lu refcount %d>=%d", |
1627 | (unsigned long) ce->e_block, | |
1628 | le32_to_cpu(BHDR(bh)->h_refcount), | |
617ba13b MC |
1629 | EXT4_XATTR_REFCOUNT_MAX); |
1630 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { | |
ac27a0ec DK |
1631 | *pce = ce; |
1632 | return bh; | |
1633 | } | |
1634 | brelse(bh); | |
2aec7c52 | 1635 | ce = mb_cache_entry_find_next(ce, inode->i_sb->s_bdev, hash); |
ac27a0ec DK |
1636 | } |
1637 | return NULL; | |
1638 | } | |
1639 | ||
1640 | #define NAME_HASH_SHIFT 5 | |
1641 | #define VALUE_HASH_SHIFT 16 | |
1642 | ||
1643 | /* | |
617ba13b | 1644 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
1645 | * |
1646 | * Compute the hash of an extended attribute. | |
1647 | */ | |
617ba13b MC |
1648 | static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, |
1649 | struct ext4_xattr_entry *entry) | |
ac27a0ec DK |
1650 | { |
1651 | __u32 hash = 0; | |
1652 | char *name = entry->e_name; | |
1653 | int n; | |
1654 | ||
2b2d6d01 | 1655 | for (n = 0; n < entry->e_name_len; n++) { |
ac27a0ec DK |
1656 | hash = (hash << NAME_HASH_SHIFT) ^ |
1657 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
1658 | *name++; | |
1659 | } | |
1660 | ||
1661 | if (entry->e_value_block == 0 && entry->e_value_size != 0) { | |
1662 | __le32 *value = (__le32 *)((char *)header + | |
1663 | le16_to_cpu(entry->e_value_offs)); | |
1664 | for (n = (le32_to_cpu(entry->e_value_size) + | |
617ba13b | 1665 | EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { |
ac27a0ec DK |
1666 | hash = (hash << VALUE_HASH_SHIFT) ^ |
1667 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
1668 | le32_to_cpu(*value++); | |
1669 | } | |
1670 | } | |
1671 | entry->e_hash = cpu_to_le32(hash); | |
1672 | } | |
1673 | ||
1674 | #undef NAME_HASH_SHIFT | |
1675 | #undef VALUE_HASH_SHIFT | |
1676 | ||
1677 | #define BLOCK_HASH_SHIFT 16 | |
1678 | ||
1679 | /* | |
617ba13b | 1680 | * ext4_xattr_rehash() |
ac27a0ec DK |
1681 | * |
1682 | * Re-compute the extended attribute hash value after an entry has changed. | |
1683 | */ | |
617ba13b MC |
1684 | static void ext4_xattr_rehash(struct ext4_xattr_header *header, |
1685 | struct ext4_xattr_entry *entry) | |
ac27a0ec | 1686 | { |
617ba13b | 1687 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
1688 | __u32 hash = 0; |
1689 | ||
617ba13b | 1690 | ext4_xattr_hash_entry(header, entry); |
ac27a0ec DK |
1691 | here = ENTRY(header+1); |
1692 | while (!IS_LAST_ENTRY(here)) { | |
1693 | if (!here->e_hash) { | |
1694 | /* Block is not shared if an entry's hash value == 0 */ | |
1695 | hash = 0; | |
1696 | break; | |
1697 | } | |
1698 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
1699 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
1700 | le32_to_cpu(here->e_hash); | |
617ba13b | 1701 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
1702 | } |
1703 | header->h_hash = cpu_to_le32(hash); | |
1704 | } | |
1705 | ||
1706 | #undef BLOCK_HASH_SHIFT | |
1707 | ||
9c191f70 M |
1708 | #define HASH_BUCKET_BITS 10 |
1709 | ||
1710 | struct mb_cache * | |
1711 | ext4_xattr_create_cache(char *name) | |
ac27a0ec | 1712 | { |
9c191f70 | 1713 | return mb_cache_create(name, HASH_BUCKET_BITS); |
ac27a0ec DK |
1714 | } |
1715 | ||
9c191f70 | 1716 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 1717 | { |
9c191f70 M |
1718 | if (cache) |
1719 | mb_cache_destroy(cache); | |
ac27a0ec | 1720 | } |
9c191f70 | 1721 |