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Commit | Line | Data |
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ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/xattr.c |
ac27a0ec DK |
3 | * |
4 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> | |
5 | * | |
6 | * Fix by Harrison Xing <harrison@mountainviewdata.com>. | |
617ba13b | 7 | * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>. |
ac27a0ec DK |
8 | * Extended attributes for symlinks and special files added per |
9 | * suggestion of Luka Renko <luka.renko@hermes.si>. | |
10 | * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, | |
11 | * Red Hat Inc. | |
12 | * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz | |
13 | * and Andreas Gruenbacher <agruen@suse.de>. | |
14 | */ | |
15 | ||
16 | /* | |
17 | * Extended attributes are stored directly in inodes (on file systems with | |
18 | * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl | |
19 | * field contains the block number if an inode uses an additional block. All | |
20 | * attributes must fit in the inode and one additional block. Blocks that | |
21 | * contain the identical set of attributes may be shared among several inodes. | |
22 | * Identical blocks are detected by keeping a cache of blocks that have | |
23 | * recently been accessed. | |
24 | * | |
25 | * The attributes in inodes and on blocks have a different header; the entries | |
26 | * are stored in the same format: | |
27 | * | |
28 | * +------------------+ | |
29 | * | header | | |
30 | * | entry 1 | | | |
31 | * | entry 2 | | growing downwards | |
32 | * | entry 3 | v | |
33 | * | four null bytes | | |
34 | * | . . . | | |
35 | * | value 1 | ^ | |
36 | * | value 3 | | growing upwards | |
37 | * | value 2 | | | |
38 | * +------------------+ | |
39 | * | |
40 | * The header is followed by multiple entry descriptors. In disk blocks, the | |
41 | * entry descriptors are kept sorted. In inodes, they are unsorted. The | |
42 | * attribute values are aligned to the end of the block in no specific order. | |
43 | * | |
44 | * Locking strategy | |
45 | * ---------------- | |
617ba13b | 46 | * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem. |
ac27a0ec DK |
47 | * EA blocks are only changed if they are exclusive to an inode, so |
48 | * holding xattr_sem also means that nothing but the EA block's reference | |
49 | * count can change. Multiple writers to the same block are synchronized | |
50 | * by the buffer lock. | |
51 | */ | |
52 | ||
53 | #include <linux/init.h> | |
54 | #include <linux/fs.h> | |
55 | #include <linux/slab.h> | |
7a2508e1 | 56 | #include <linux/mbcache.h> |
ac27a0ec | 57 | #include <linux/quotaops.h> |
3dcf5451 CH |
58 | #include "ext4_jbd2.h" |
59 | #include "ext4.h" | |
ac27a0ec DK |
60 | #include "xattr.h" |
61 | #include "acl.h" | |
62 | ||
617ba13b | 63 | #ifdef EXT4_XATTR_DEBUG |
d74f3d25 JP |
64 | # define ea_idebug(inode, fmt, ...) \ |
65 | printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \ | |
66 | inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__) | |
67 | # define ea_bdebug(bh, fmt, ...) \ | |
68 | printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \ | |
69 | bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__) | |
ac27a0ec | 70 | #else |
ace36ad4 JP |
71 | # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
72 | # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) | |
ac27a0ec DK |
73 | #endif |
74 | ||
7a2508e1 | 75 | static void ext4_xattr_cache_insert(struct mb_cache *, struct buffer_head *); |
617ba13b MC |
76 | static struct buffer_head *ext4_xattr_cache_find(struct inode *, |
77 | struct ext4_xattr_header *, | |
7a2508e1 | 78 | struct mb_cache_entry **); |
617ba13b MC |
79 | static void ext4_xattr_rehash(struct ext4_xattr_header *, |
80 | struct ext4_xattr_entry *); | |
ac27a0ec | 81 | |
d6006186 | 82 | static const struct xattr_handler * const ext4_xattr_handler_map[] = { |
617ba13b | 83 | [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, |
03010a33 | 84 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
85 | [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
86 | [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, | |
ac27a0ec | 87 | #endif |
617ba13b | 88 | [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, |
03010a33 | 89 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 90 | [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, |
ac27a0ec DK |
91 | #endif |
92 | }; | |
93 | ||
11e27528 | 94 | const struct xattr_handler *ext4_xattr_handlers[] = { |
617ba13b MC |
95 | &ext4_xattr_user_handler, |
96 | &ext4_xattr_trusted_handler, | |
03010a33 | 97 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
98 | &posix_acl_access_xattr_handler, |
99 | &posix_acl_default_xattr_handler, | |
ac27a0ec | 100 | #endif |
03010a33 | 101 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 102 | &ext4_xattr_security_handler, |
ac27a0ec DK |
103 | #endif |
104 | NULL | |
105 | }; | |
106 | ||
9c191f70 M |
107 | #define EXT4_GET_MB_CACHE(inode) (((struct ext4_sb_info *) \ |
108 | inode->i_sb->s_fs_info)->s_mb_cache) | |
109 | ||
cc8e94fd DW |
110 | static __le32 ext4_xattr_block_csum(struct inode *inode, |
111 | sector_t block_nr, | |
112 | struct ext4_xattr_header *hdr) | |
113 | { | |
114 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
d6a77105 | 115 | __u32 csum; |
d6a77105 | 116 | __le64 dsk_block_nr = cpu_to_le64(block_nr); |
b47820ed DJ |
117 | __u32 dummy_csum = 0; |
118 | int offset = offsetof(struct ext4_xattr_header, h_checksum); | |
cc8e94fd | 119 | |
d6a77105 TT |
120 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, |
121 | sizeof(dsk_block_nr)); | |
b47820ed DJ |
122 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); |
123 | csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); | |
124 | offset += sizeof(dummy_csum); | |
125 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, | |
126 | EXT4_BLOCK_SIZE(inode->i_sb) - offset); | |
41eb70dd | 127 | |
cc8e94fd DW |
128 | return cpu_to_le32(csum); |
129 | } | |
130 | ||
131 | static int ext4_xattr_block_csum_verify(struct inode *inode, | |
dac7a4b4 | 132 | struct buffer_head *bh) |
cc8e94fd | 133 | { |
dac7a4b4 TT |
134 | struct ext4_xattr_header *hdr = BHDR(bh); |
135 | int ret = 1; | |
cc8e94fd | 136 | |
dac7a4b4 TT |
137 | if (ext4_has_metadata_csum(inode->i_sb)) { |
138 | lock_buffer(bh); | |
139 | ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, | |
140 | bh->b_blocknr, hdr)); | |
141 | unlock_buffer(bh); | |
142 | } | |
143 | return ret; | |
cc8e94fd DW |
144 | } |
145 | ||
dac7a4b4 TT |
146 | static void ext4_xattr_block_csum_set(struct inode *inode, |
147 | struct buffer_head *bh) | |
cc8e94fd | 148 | { |
dac7a4b4 TT |
149 | if (ext4_has_metadata_csum(inode->i_sb)) |
150 | BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, | |
151 | bh->b_blocknr, BHDR(bh)); | |
cc8e94fd DW |
152 | } |
153 | ||
11e27528 | 154 | static inline const struct xattr_handler * |
617ba13b | 155 | ext4_xattr_handler(int name_index) |
ac27a0ec | 156 | { |
11e27528 | 157 | const struct xattr_handler *handler = NULL; |
ac27a0ec | 158 | |
617ba13b MC |
159 | if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
160 | handler = ext4_xattr_handler_map[name_index]; | |
ac27a0ec DK |
161 | return handler; |
162 | } | |
163 | ||
ac27a0ec | 164 | static int |
2c4f9923 EB |
165 | ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, |
166 | void *value_start) | |
ac27a0ec | 167 | { |
a0626e75 DW |
168 | struct ext4_xattr_entry *e = entry; |
169 | ||
d7614cc1 | 170 | /* Find the end of the names list */ |
a0626e75 DW |
171 | while (!IS_LAST_ENTRY(e)) { |
172 | struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); | |
ac27a0ec | 173 | if ((void *)next >= end) |
6a797d27 | 174 | return -EFSCORRUPTED; |
a0626e75 | 175 | e = next; |
ac27a0ec | 176 | } |
a0626e75 | 177 | |
d7614cc1 | 178 | /* Check the values */ |
a0626e75 | 179 | while (!IS_LAST_ENTRY(entry)) { |
2de58f11 JK |
180 | if (entry->e_value_block != 0) |
181 | return -EFSCORRUPTED; | |
d7614cc1 EB |
182 | if (entry->e_value_size != 0) { |
183 | u16 offs = le16_to_cpu(entry->e_value_offs); | |
184 | u32 size = le32_to_cpu(entry->e_value_size); | |
185 | void *value; | |
186 | ||
187 | /* | |
188 | * The value cannot overlap the names, and the value | |
189 | * with padding cannot extend beyond 'end'. Check both | |
190 | * the padded and unpadded sizes, since the size may | |
191 | * overflow to 0 when adding padding. | |
192 | */ | |
193 | if (offs > end - value_start) | |
194 | return -EFSCORRUPTED; | |
195 | value = value_start + offs; | |
196 | if (value < (void *)e + sizeof(u32) || | |
197 | size > end - value || | |
198 | EXT4_XATTR_SIZE(size) > end - value) | |
199 | return -EFSCORRUPTED; | |
200 | } | |
a0626e75 DW |
201 | entry = EXT4_XATTR_NEXT(entry); |
202 | } | |
203 | ||
ac27a0ec DK |
204 | return 0; |
205 | } | |
206 | ||
207 | static inline int | |
cc8e94fd | 208 | ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) |
ac27a0ec | 209 | { |
cc8e94fd DW |
210 | int error; |
211 | ||
212 | if (buffer_verified(bh)) | |
213 | return 0; | |
214 | ||
617ba13b | 215 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 216 | BHDR(bh)->h_blocks != cpu_to_le32(1)) |
6a797d27 | 217 | return -EFSCORRUPTED; |
dac7a4b4 | 218 | if (!ext4_xattr_block_csum_verify(inode, bh)) |
6a797d27 | 219 | return -EFSBADCRC; |
2c4f9923 EB |
220 | error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, |
221 | bh->b_data); | |
cc8e94fd DW |
222 | if (!error) |
223 | set_buffer_verified(bh); | |
224 | return error; | |
ac27a0ec DK |
225 | } |
226 | ||
9e92f48c TT |
227 | static int |
228 | __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, | |
229 | void *end, const char *function, unsigned int line) | |
230 | { | |
9e92f48c TT |
231 | int error = -EFSCORRUPTED; |
232 | ||
290ab230 | 233 | if (end - (void *)header < sizeof(*header) + sizeof(u32) || |
19962509 | 234 | (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) |
9e92f48c | 235 | goto errout; |
2c4f9923 | 236 | error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); |
9e92f48c TT |
237 | errout: |
238 | if (error) | |
239 | __ext4_error_inode(inode, function, line, 0, | |
240 | "corrupted in-inode xattr"); | |
241 | return error; | |
242 | } | |
243 | ||
244 | #define xattr_check_inode(inode, header, end) \ | |
245 | __xattr_check_inode((inode), (header), (end), __func__, __LINE__) | |
246 | ||
ac27a0ec | 247 | static int |
617ba13b | 248 | ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, |
6ba644b9 | 249 | const char *name, int sorted) |
ac27a0ec | 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; | |
ac27a0ec DK |
269 | return cmp ? -ENODATA : 0; |
270 | } | |
271 | ||
272 | static int | |
617ba13b | 273 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
274 | void *buffer, size_t buffer_size) |
275 | { | |
276 | struct buffer_head *bh = NULL; | |
617ba13b | 277 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
278 | size_t size; |
279 | int error; | |
7a2508e1 | 280 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
281 | |
282 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
283 | name_index, name, buffer, (long)buffer_size); | |
284 | ||
285 | error = -ENODATA; | |
617ba13b | 286 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 287 | goto cleanup; |
ace36ad4 JP |
288 | ea_idebug(inode, "reading block %llu", |
289 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 290 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
291 | if (!bh) |
292 | goto cleanup; | |
293 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
294 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 295 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
296 | EXT4_ERROR_INODE(inode, "bad block %llu", |
297 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 298 | error = -EFSCORRUPTED; |
ac27a0ec DK |
299 | goto cleanup; |
300 | } | |
9c191f70 | 301 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
ac27a0ec | 302 | entry = BFIRST(bh); |
6ba644b9 | 303 | error = ext4_xattr_find_entry(&entry, name_index, name, 1); |
ac27a0ec DK |
304 | if (error) |
305 | goto cleanup; | |
306 | size = le32_to_cpu(entry->e_value_size); | |
307 | if (buffer) { | |
308 | error = -ERANGE; | |
309 | if (size > buffer_size) | |
310 | goto cleanup; | |
311 | memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), | |
312 | size); | |
313 | } | |
314 | error = size; | |
315 | ||
316 | cleanup: | |
317 | brelse(bh); | |
318 | return error; | |
319 | } | |
320 | ||
879b3825 | 321 | int |
617ba13b | 322 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
323 | void *buffer, size_t buffer_size) |
324 | { | |
617ba13b MC |
325 | struct ext4_xattr_ibody_header *header; |
326 | struct ext4_xattr_entry *entry; | |
327 | struct ext4_inode *raw_inode; | |
328 | struct ext4_iloc iloc; | |
ac27a0ec DK |
329 | size_t size; |
330 | void *end; | |
331 | int error; | |
332 | ||
19f5fb7a | 333 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 334 | return -ENODATA; |
617ba13b | 335 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
336 | if (error) |
337 | return error; | |
617ba13b | 338 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 339 | header = IHDR(inode, raw_inode); |
617ba13b | 340 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 341 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
342 | if (error) |
343 | goto cleanup; | |
6ba644b9 EB |
344 | entry = IFIRST(header); |
345 | error = ext4_xattr_find_entry(&entry, name_index, name, 0); | |
ac27a0ec DK |
346 | if (error) |
347 | goto cleanup; | |
348 | size = le32_to_cpu(entry->e_value_size); | |
349 | if (buffer) { | |
350 | error = -ERANGE; | |
351 | if (size > buffer_size) | |
352 | goto cleanup; | |
353 | memcpy(buffer, (void *)IFIRST(header) + | |
354 | le16_to_cpu(entry->e_value_offs), size); | |
355 | } | |
356 | error = size; | |
357 | ||
358 | cleanup: | |
359 | brelse(iloc.bh); | |
360 | return error; | |
361 | } | |
362 | ||
363 | /* | |
617ba13b | 364 | * ext4_xattr_get() |
ac27a0ec DK |
365 | * |
366 | * Copy an extended attribute into the buffer | |
367 | * provided, or compute the buffer size required. | |
368 | * Buffer is NULL to compute the size of the buffer required. | |
369 | * | |
370 | * Returns a negative error number on failure, or the number of bytes | |
371 | * used / required on success. | |
372 | */ | |
373 | int | |
617ba13b | 374 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
375 | void *buffer, size_t buffer_size) |
376 | { | |
377 | int error; | |
378 | ||
0db1ff22 TT |
379 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
380 | return -EIO; | |
381 | ||
230b8c1a ZZ |
382 | if (strlen(name) > 255) |
383 | return -ERANGE; | |
384 | ||
617ba13b MC |
385 | down_read(&EXT4_I(inode)->xattr_sem); |
386 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
387 | buffer_size); |
388 | if (error == -ENODATA) | |
617ba13b | 389 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 390 | buffer_size); |
617ba13b | 391 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
392 | return error; |
393 | } | |
394 | ||
395 | static int | |
431547b3 | 396 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
397 | char *buffer, size_t buffer_size) |
398 | { | |
399 | size_t rest = buffer_size; | |
400 | ||
617ba13b | 401 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 402 | const struct xattr_handler *handler = |
617ba13b | 403 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec | 404 | |
764a5c6b AG |
405 | if (handler && (!handler->list || handler->list(dentry))) { |
406 | const char *prefix = handler->prefix ?: handler->name; | |
407 | size_t prefix_len = strlen(prefix); | |
408 | size_t size = prefix_len + entry->e_name_len + 1; | |
409 | ||
ac27a0ec DK |
410 | if (buffer) { |
411 | if (size > rest) | |
412 | return -ERANGE; | |
764a5c6b AG |
413 | memcpy(buffer, prefix, prefix_len); |
414 | buffer += prefix_len; | |
415 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
416 | buffer += entry->e_name_len; | |
417 | *buffer++ = 0; | |
ac27a0ec DK |
418 | } |
419 | rest -= size; | |
420 | } | |
421 | } | |
764a5c6b | 422 | return buffer_size - rest; /* total size */ |
ac27a0ec DK |
423 | } |
424 | ||
425 | static int | |
431547b3 | 426 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 427 | { |
2b0143b5 | 428 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
429 | struct buffer_head *bh = NULL; |
430 | int error; | |
7a2508e1 | 431 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec DK |
432 | |
433 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
434 | buffer, (long)buffer_size); | |
435 | ||
436 | error = 0; | |
617ba13b | 437 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 438 | goto cleanup; |
ace36ad4 JP |
439 | ea_idebug(inode, "reading block %llu", |
440 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 441 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
442 | error = -EIO; |
443 | if (!bh) | |
444 | goto cleanup; | |
445 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
446 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 447 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
448 | EXT4_ERROR_INODE(inode, "bad block %llu", |
449 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 450 | error = -EFSCORRUPTED; |
ac27a0ec DK |
451 | goto cleanup; |
452 | } | |
9c191f70 | 453 | ext4_xattr_cache_insert(ext4_mb_cache, bh); |
431547b3 | 454 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); |
ac27a0ec DK |
455 | |
456 | cleanup: | |
457 | brelse(bh); | |
458 | ||
459 | return error; | |
460 | } | |
461 | ||
462 | static int | |
431547b3 | 463 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 464 | { |
2b0143b5 | 465 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
466 | struct ext4_xattr_ibody_header *header; |
467 | struct ext4_inode *raw_inode; | |
468 | struct ext4_iloc iloc; | |
ac27a0ec DK |
469 | void *end; |
470 | int error; | |
471 | ||
19f5fb7a | 472 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 473 | return 0; |
617ba13b | 474 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
475 | if (error) |
476 | return error; | |
617ba13b | 477 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 478 | header = IHDR(inode, raw_inode); |
617ba13b | 479 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 480 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
481 | if (error) |
482 | goto cleanup; | |
431547b3 | 483 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
484 | buffer, buffer_size); |
485 | ||
486 | cleanup: | |
487 | brelse(iloc.bh); | |
488 | return error; | |
489 | } | |
490 | ||
491 | /* | |
ba7ea1d8 EB |
492 | * Inode operation listxattr() |
493 | * | |
494 | * d_inode(dentry)->i_rwsem: don't care | |
ac27a0ec DK |
495 | * |
496 | * Copy a list of attribute names into the buffer | |
497 | * provided, or compute the buffer size required. | |
498 | * Buffer is NULL to compute the size of the buffer required. | |
499 | * | |
500 | * Returns a negative error number on failure, or the number of bytes | |
501 | * used / required on success. | |
502 | */ | |
ba7ea1d8 EB |
503 | ssize_t |
504 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
ac27a0ec | 505 | { |
eaeef867 | 506 | int ret, ret2; |
ac27a0ec | 507 | |
2b0143b5 | 508 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
509 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
510 | if (ret < 0) | |
511 | goto errout; | |
512 | if (buffer) { | |
513 | buffer += ret; | |
514 | buffer_size -= ret; | |
ac27a0ec | 515 | } |
eaeef867 TT |
516 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
517 | if (ret < 0) | |
518 | goto errout; | |
519 | ret += ret2; | |
520 | errout: | |
2b0143b5 | 521 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 522 | return ret; |
ac27a0ec DK |
523 | } |
524 | ||
525 | /* | |
617ba13b | 526 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
527 | * not set, set it. |
528 | */ | |
617ba13b | 529 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
530 | struct super_block *sb) |
531 | { | |
e2b911c5 | 532 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
533 | return; |
534 | ||
5d601255 | 535 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 536 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
e2b911c5 | 537 | ext4_set_feature_xattr(sb); |
a0375156 | 538 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec | 539 | } |
ac27a0ec DK |
540 | } |
541 | ||
542 | /* | |
ec4cb1aa JK |
543 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
544 | * otherwise free the block. | |
ac27a0ec DK |
545 | */ |
546 | static void | |
617ba13b | 547 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
ac27a0ec DK |
548 | struct buffer_head *bh) |
549 | { | |
6048c64b AG |
550 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
551 | u32 hash, ref; | |
8a2bfdcb | 552 | int error = 0; |
ac27a0ec | 553 | |
5d601255 | 554 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
555 | error = ext4_journal_get_write_access(handle, bh); |
556 | if (error) | |
557 | goto out; | |
558 | ||
559 | lock_buffer(bh); | |
6048c64b AG |
560 | hash = le32_to_cpu(BHDR(bh)->h_hash); |
561 | ref = le32_to_cpu(BHDR(bh)->h_refcount); | |
562 | if (ref == 1) { | |
ac27a0ec | 563 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
564 | /* |
565 | * This must happen under buffer lock for | |
566 | * ext4_xattr_block_set() to reliably detect freed block | |
567 | */ | |
6048c64b | 568 | mb_cache_entry_delete_block(ext4_mb_cache, hash, bh->b_blocknr); |
ac27a0ec | 569 | get_bh(bh); |
ec4cb1aa | 570 | unlock_buffer(bh); |
e6362609 TT |
571 | ext4_free_blocks(handle, inode, bh, 0, 1, |
572 | EXT4_FREE_BLOCKS_METADATA | | |
573 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 574 | } else { |
6048c64b AG |
575 | ref--; |
576 | BHDR(bh)->h_refcount = cpu_to_le32(ref); | |
577 | if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { | |
578 | struct mb_cache_entry *ce; | |
579 | ||
580 | ce = mb_cache_entry_get(ext4_mb_cache, hash, | |
581 | bh->b_blocknr); | |
582 | if (ce) { | |
583 | ce->e_reusable = 1; | |
584 | mb_cache_entry_put(ext4_mb_cache, ce); | |
585 | } | |
586 | } | |
587 | ||
dac7a4b4 | 588 | ext4_xattr_block_csum_set(inode, bh); |
ec4cb1aa JK |
589 | /* |
590 | * Beware of this ugliness: Releasing of xattr block references | |
591 | * from different inodes can race and so we have to protect | |
592 | * from a race where someone else frees the block (and releases | |
593 | * its journal_head) before we are done dirtying the buffer. In | |
594 | * nojournal mode this race is harmless and we actually cannot | |
dac7a4b4 | 595 | * call ext4_handle_dirty_metadata() with locked buffer as |
ec4cb1aa JK |
596 | * that function can call sync_dirty_buffer() so for that case |
597 | * we handle the dirtying after unlocking the buffer. | |
598 | */ | |
599 | if (ext4_handle_valid(handle)) | |
dac7a4b4 | 600 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
c1bb05a6 | 601 | unlock_buffer(bh); |
ec4cb1aa | 602 | if (!ext4_handle_valid(handle)) |
dac7a4b4 | 603 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
8a2bfdcb | 604 | if (IS_SYNC(inode)) |
0390131b | 605 | ext4_handle_sync(handle); |
1231b3a1 | 606 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
607 | ea_bdebug(bh, "refcount now=%d; releasing", |
608 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 609 | } |
8a2bfdcb MC |
610 | out: |
611 | ext4_std_error(inode->i_sb, error); | |
612 | return; | |
ac27a0ec DK |
613 | } |
614 | ||
6dd4ee7c KS |
615 | /* |
616 | * Find the available free space for EAs. This also returns the total number of | |
617 | * bytes used by EA entries. | |
618 | */ | |
619 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
620 | size_t *min_offs, void *base, int *total) | |
621 | { | |
622 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1cba4237 | 623 | if (last->e_value_size) { |
6dd4ee7c KS |
624 | size_t offs = le16_to_cpu(last->e_value_offs); |
625 | if (offs < *min_offs) | |
626 | *min_offs = offs; | |
627 | } | |
7b1b2c1b TT |
628 | if (total) |
629 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
630 | } |
631 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
632 | } | |
633 | ||
ac27a0ec | 634 | static int |
617ba13b | 635 | ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) |
ac27a0ec | 636 | { |
617ba13b | 637 | struct ext4_xattr_entry *last; |
ac27a0ec DK |
638 | size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); |
639 | ||
640 | /* Compute min_offs and last. */ | |
641 | last = s->first; | |
617ba13b | 642 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
1cba4237 | 643 | if (last->e_value_size) { |
ac27a0ec DK |
644 | size_t offs = le16_to_cpu(last->e_value_offs); |
645 | if (offs < min_offs) | |
646 | min_offs = offs; | |
647 | } | |
648 | } | |
649 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); | |
650 | if (!s->not_found) { | |
1cba4237 | 651 | if (s->here->e_value_size) { |
ac27a0ec | 652 | size_t size = le32_to_cpu(s->here->e_value_size); |
617ba13b | 653 | free += EXT4_XATTR_SIZE(size); |
ac27a0ec | 654 | } |
617ba13b | 655 | free += EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
656 | } |
657 | if (i->value) { | |
5f80f62a | 658 | if (free < EXT4_XATTR_LEN(name_len) + |
617ba13b | 659 | EXT4_XATTR_SIZE(i->value_len)) |
ac27a0ec DK |
660 | return -ENOSPC; |
661 | } | |
662 | ||
663 | if (i->value && s->not_found) { | |
664 | /* Insert the new name. */ | |
617ba13b | 665 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
666 | size_t rest = (void *)last - (void *)s->here + sizeof(__u32); |
667 | memmove((void *)s->here + size, s->here, rest); | |
668 | memset(s->here, 0, size); | |
669 | s->here->e_name_index = i->name_index; | |
670 | s->here->e_name_len = name_len; | |
671 | memcpy(s->here->e_name, i->name, name_len); | |
672 | } else { | |
1cba4237 | 673 | if (s->here->e_value_size) { |
ac27a0ec DK |
674 | void *first_val = s->base + min_offs; |
675 | size_t offs = le16_to_cpu(s->here->e_value_offs); | |
676 | void *val = s->base + offs; | |
617ba13b | 677 | size_t size = EXT4_XATTR_SIZE( |
ac27a0ec DK |
678 | le32_to_cpu(s->here->e_value_size)); |
679 | ||
617ba13b | 680 | if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { |
ac27a0ec DK |
681 | /* The old and the new value have the same |
682 | size. Just replace. */ | |
683 | s->here->e_value_size = | |
684 | cpu_to_le32(i->value_len); | |
bd9926e8 TT |
685 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
686 | memset(val, 0, size); | |
687 | } else { | |
688 | /* Clear pad bytes first. */ | |
689 | memset(val + size - EXT4_XATTR_PAD, 0, | |
690 | EXT4_XATTR_PAD); | |
691 | memcpy(val, i->value, i->value_len); | |
692 | } | |
ac27a0ec DK |
693 | return 0; |
694 | } | |
695 | ||
696 | /* Remove the old value. */ | |
697 | memmove(first_val + size, first_val, val - first_val); | |
698 | memset(first_val, 0, size); | |
699 | s->here->e_value_size = 0; | |
700 | s->here->e_value_offs = 0; | |
701 | min_offs += size; | |
702 | ||
703 | /* Adjust all value offsets. */ | |
704 | last = s->first; | |
705 | while (!IS_LAST_ENTRY(last)) { | |
706 | size_t o = le16_to_cpu(last->e_value_offs); | |
1cba4237 | 707 | if (last->e_value_size && o < offs) |
ac27a0ec DK |
708 | last->e_value_offs = |
709 | cpu_to_le16(o + size); | |
617ba13b | 710 | last = EXT4_XATTR_NEXT(last); |
ac27a0ec DK |
711 | } |
712 | } | |
713 | if (!i->value) { | |
714 | /* Remove the old name. */ | |
617ba13b | 715 | size_t size = EXT4_XATTR_LEN(name_len); |
ac27a0ec DK |
716 | last = ENTRY((void *)last - size); |
717 | memmove(s->here, (void *)s->here + size, | |
718 | (void *)last - (void *)s->here + sizeof(__u32)); | |
719 | memset(last, 0, size); | |
720 | } | |
721 | } | |
722 | ||
723 | if (i->value) { | |
724 | /* Insert the new value. */ | |
725 | s->here->e_value_size = cpu_to_le32(i->value_len); | |
726 | if (i->value_len) { | |
617ba13b | 727 | size_t size = EXT4_XATTR_SIZE(i->value_len); |
ac27a0ec DK |
728 | void *val = s->base + min_offs - size; |
729 | s->here->e_value_offs = cpu_to_le16(min_offs - size); | |
bd9926e8 TT |
730 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
731 | memset(val, 0, size); | |
732 | } else { | |
733 | /* Clear the pad bytes first. */ | |
734 | memset(val + size - EXT4_XATTR_PAD, 0, | |
735 | EXT4_XATTR_PAD); | |
736 | memcpy(val, i->value, i->value_len); | |
737 | } | |
ac27a0ec DK |
738 | } |
739 | } | |
740 | return 0; | |
741 | } | |
742 | ||
617ba13b MC |
743 | struct ext4_xattr_block_find { |
744 | struct ext4_xattr_search s; | |
ac27a0ec DK |
745 | struct buffer_head *bh; |
746 | }; | |
747 | ||
748 | static int | |
617ba13b MC |
749 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
750 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
751 | { |
752 | struct super_block *sb = inode->i_sb; | |
753 | int error; | |
754 | ||
755 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
756 | i->name_index, i->name, i->value, (long)i->value_len); | |
757 | ||
617ba13b | 758 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 759 | /* The inode already has an extended attribute block. */ |
617ba13b | 760 | bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
761 | error = -EIO; |
762 | if (!bs->bh) | |
763 | goto cleanup; | |
764 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", | |
765 | atomic_read(&(bs->bh->b_count)), | |
766 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
cc8e94fd | 767 | if (ext4_xattr_check_block(inode, bs->bh)) { |
24676da4 TT |
768 | EXT4_ERROR_INODE(inode, "bad block %llu", |
769 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 770 | error = -EFSCORRUPTED; |
ac27a0ec DK |
771 | goto cleanup; |
772 | } | |
773 | /* Find the named attribute. */ | |
774 | bs->s.base = BHDR(bs->bh); | |
775 | bs->s.first = BFIRST(bs->bh); | |
776 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
777 | bs->s.here = bs->s.first; | |
617ba13b | 778 | error = ext4_xattr_find_entry(&bs->s.here, i->name_index, |
6ba644b9 | 779 | i->name, 1); |
ac27a0ec DK |
780 | if (error && error != -ENODATA) |
781 | goto cleanup; | |
782 | bs->s.not_found = error; | |
783 | } | |
784 | error = 0; | |
785 | ||
786 | cleanup: | |
787 | return error; | |
788 | } | |
789 | ||
790 | static int | |
617ba13b MC |
791 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
792 | struct ext4_xattr_info *i, | |
793 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
794 | { |
795 | struct super_block *sb = inode->i_sb; | |
796 | struct buffer_head *new_bh = NULL; | |
617ba13b | 797 | struct ext4_xattr_search *s = &bs->s; |
7a2508e1 | 798 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 799 | int error = 0; |
7a2508e1 | 800 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); |
ac27a0ec | 801 | |
617ba13b | 802 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec DK |
803 | |
804 | if (i->value && i->value_len > sb->s_blocksize) | |
805 | return -ENOSPC; | |
806 | if (s->base) { | |
5d601255 | 807 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
808 | error = ext4_journal_get_write_access(handle, bs->bh); |
809 | if (error) | |
810 | goto cleanup; | |
811 | lock_buffer(bs->bh); | |
812 | ||
ac27a0ec | 813 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
814 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
815 | ||
816 | /* | |
817 | * This must happen under buffer lock for | |
818 | * ext4_xattr_block_set() to reliably detect modified | |
819 | * block | |
820 | */ | |
7a2508e1 JK |
821 | mb_cache_entry_delete_block(ext4_mb_cache, hash, |
822 | bs->bh->b_blocknr); | |
ac27a0ec | 823 | ea_bdebug(bs->bh, "modifying in-place"); |
617ba13b | 824 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
825 | if (!error) { |
826 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 827 | ext4_xattr_rehash(header(s->base), |
ac27a0ec | 828 | s->here); |
9c191f70 M |
829 | ext4_xattr_cache_insert(ext4_mb_cache, |
830 | bs->bh); | |
ac27a0ec | 831 | } |
dac7a4b4 | 832 | ext4_xattr_block_csum_set(inode, bs->bh); |
ac27a0ec | 833 | unlock_buffer(bs->bh); |
6a797d27 | 834 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
835 | goto bad_block; |
836 | if (!error) | |
dac7a4b4 TT |
837 | error = ext4_handle_dirty_metadata(handle, |
838 | inode, | |
839 | bs->bh); | |
ac27a0ec DK |
840 | if (error) |
841 | goto cleanup; | |
842 | goto inserted; | |
843 | } else { | |
844 | int offset = (char *)s->here - bs->bh->b_data; | |
845 | ||
8a2bfdcb | 846 | unlock_buffer(bs->bh); |
ac27a0ec | 847 | ea_bdebug(bs->bh, "cloning"); |
216553c4 | 848 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
849 | error = -ENOMEM; |
850 | if (s->base == NULL) | |
851 | goto cleanup; | |
852 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
853 | s->first = ENTRY(header(s->base)+1); | |
854 | header(s->base)->h_refcount = cpu_to_le32(1); | |
855 | s->here = ENTRY(s->base + offset); | |
856 | s->end = s->base + bs->bh->b_size; | |
857 | } | |
858 | } else { | |
859 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 860 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
861 | /* assert(header == s->base) */ |
862 | error = -ENOMEM; | |
863 | if (s->base == NULL) | |
864 | goto cleanup; | |
617ba13b | 865 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
866 | header(s->base)->h_blocks = cpu_to_le32(1); |
867 | header(s->base)->h_refcount = cpu_to_le32(1); | |
868 | s->first = ENTRY(header(s->base)+1); | |
869 | s->here = ENTRY(header(s->base)+1); | |
870 | s->end = s->base + sb->s_blocksize; | |
871 | } | |
872 | ||
617ba13b | 873 | error = ext4_xattr_set_entry(i, s); |
6a797d27 | 874 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
875 | goto bad_block; |
876 | if (error) | |
877 | goto cleanup; | |
878 | if (!IS_LAST_ENTRY(s->first)) | |
617ba13b | 879 | ext4_xattr_rehash(header(s->base), s->here); |
ac27a0ec DK |
880 | |
881 | inserted: | |
882 | if (!IS_LAST_ENTRY(s->first)) { | |
617ba13b | 883 | new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); |
ac27a0ec DK |
884 | if (new_bh) { |
885 | /* We found an identical block in the cache. */ | |
886 | if (new_bh == bs->bh) | |
887 | ea_bdebug(new_bh, "keeping"); | |
888 | else { | |
6048c64b AG |
889 | u32 ref; |
890 | ||
ac27a0ec DK |
891 | /* The old block is released after updating |
892 | the inode. */ | |
1231b3a1 LC |
893 | error = dquot_alloc_block(inode, |
894 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 895 | if (error) |
ac27a0ec | 896 | goto cleanup; |
5d601255 | 897 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 898 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
899 | new_bh); |
900 | if (error) | |
901 | goto cleanup_dquot; | |
902 | lock_buffer(new_bh); | |
82939d79 JK |
903 | /* |
904 | * We have to be careful about races with | |
6048c64b AG |
905 | * freeing, rehashing or adding references to |
906 | * xattr block. Once we hold buffer lock xattr | |
907 | * block's state is stable so we can check | |
908 | * whether the block got freed / rehashed or | |
909 | * not. Since we unhash mbcache entry under | |
910 | * buffer lock when freeing / rehashing xattr | |
911 | * block, checking whether entry is still | |
912 | * hashed is reliable. Same rules hold for | |
913 | * e_reusable handling. | |
82939d79 | 914 | */ |
6048c64b AG |
915 | if (hlist_bl_unhashed(&ce->e_hash_list) || |
916 | !ce->e_reusable) { | |
82939d79 JK |
917 | /* |
918 | * Undo everything and check mbcache | |
919 | * again. | |
920 | */ | |
921 | unlock_buffer(new_bh); | |
922 | dquot_free_block(inode, | |
923 | EXT4_C2B(EXT4_SB(sb), | |
924 | 1)); | |
925 | brelse(new_bh); | |
7a2508e1 | 926 | mb_cache_entry_put(ext4_mb_cache, ce); |
82939d79 JK |
927 | ce = NULL; |
928 | new_bh = NULL; | |
929 | goto inserted; | |
930 | } | |
6048c64b AG |
931 | ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
932 | BHDR(new_bh)->h_refcount = cpu_to_le32(ref); | |
933 | if (ref >= EXT4_XATTR_REFCOUNT_MAX) | |
934 | ce->e_reusable = 0; | |
ac27a0ec | 935 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
6048c64b | 936 | ref); |
dac7a4b4 | 937 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec | 938 | unlock_buffer(new_bh); |
dac7a4b4 TT |
939 | error = ext4_handle_dirty_metadata(handle, |
940 | inode, | |
941 | new_bh); | |
ac27a0ec DK |
942 | if (error) |
943 | goto cleanup_dquot; | |
944 | } | |
7a2508e1 JK |
945 | mb_cache_entry_touch(ext4_mb_cache, ce); |
946 | mb_cache_entry_put(ext4_mb_cache, ce); | |
ac27a0ec DK |
947 | ce = NULL; |
948 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
949 | /* We were modifying this block in-place. */ | |
950 | ea_bdebug(bs->bh, "keeping this block"); | |
951 | new_bh = bs->bh; | |
952 | get_bh(new_bh); | |
953 | } else { | |
954 | /* We need to allocate a new block */ | |
fb0a387d ES |
955 | ext4_fsblk_t goal, block; |
956 | ||
957 | goal = ext4_group_first_block_no(sb, | |
d00a6d7b | 958 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
959 | |
960 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 961 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
962 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
963 | ||
55f020db AH |
964 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
965 | NULL, &error); | |
ac27a0ec DK |
966 | if (error) |
967 | goto cleanup; | |
fb0a387d | 968 | |
12e9b892 | 969 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
970 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
971 | ||
ace36ad4 JP |
972 | ea_idebug(inode, "creating block %llu", |
973 | (unsigned long long)block); | |
ac27a0ec DK |
974 | |
975 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 976 | if (unlikely(!new_bh)) { |
860d21e2 | 977 | error = -ENOMEM; |
ac27a0ec | 978 | getblk_failed: |
7dc57615 | 979 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 980 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
981 | goto cleanup; |
982 | } | |
983 | lock_buffer(new_bh); | |
617ba13b | 984 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
985 | if (error) { |
986 | unlock_buffer(new_bh); | |
860d21e2 | 987 | error = -EIO; |
ac27a0ec DK |
988 | goto getblk_failed; |
989 | } | |
990 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
dac7a4b4 | 991 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec DK |
992 | set_buffer_uptodate(new_bh); |
993 | unlock_buffer(new_bh); | |
9c191f70 | 994 | ext4_xattr_cache_insert(ext4_mb_cache, new_bh); |
dac7a4b4 TT |
995 | error = ext4_handle_dirty_metadata(handle, inode, |
996 | new_bh); | |
ac27a0ec DK |
997 | if (error) |
998 | goto cleanup; | |
999 | } | |
1000 | } | |
1001 | ||
1002 | /* Update the inode. */ | |
617ba13b | 1003 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
1004 | |
1005 | /* Drop the previous xattr block. */ | |
1006 | if (bs->bh && bs->bh != new_bh) | |
617ba13b | 1007 | ext4_xattr_release_block(handle, inode, bs->bh); |
ac27a0ec DK |
1008 | error = 0; |
1009 | ||
1010 | cleanup: | |
1011 | if (ce) | |
7a2508e1 | 1012 | mb_cache_entry_put(ext4_mb_cache, ce); |
ac27a0ec DK |
1013 | brelse(new_bh); |
1014 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
1015 | kfree(s->base); | |
1016 | ||
1017 | return error; | |
1018 | ||
1019 | cleanup_dquot: | |
1231b3a1 | 1020 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
1021 | goto cleanup; |
1022 | ||
1023 | bad_block: | |
24676da4 TT |
1024 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1025 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1026 | goto cleanup; |
1027 | ||
1028 | #undef header | |
1029 | } | |
1030 | ||
879b3825 TM |
1031 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
1032 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 1033 | { |
617ba13b MC |
1034 | struct ext4_xattr_ibody_header *header; |
1035 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
1036 | int error; |
1037 | ||
617ba13b | 1038 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1039 | return 0; |
617ba13b | 1040 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
1041 | header = IHDR(inode, raw_inode); |
1042 | is->s.base = is->s.first = IFIRST(header); | |
1043 | is->s.here = is->s.first; | |
617ba13b | 1044 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 1045 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
9e92f48c | 1046 | error = xattr_check_inode(inode, header, is->s.end); |
ac27a0ec DK |
1047 | if (error) |
1048 | return error; | |
1049 | /* Find the named attribute. */ | |
617ba13b | 1050 | error = ext4_xattr_find_entry(&is->s.here, i->name_index, |
6ba644b9 | 1051 | i->name, 0); |
ac27a0ec DK |
1052 | if (error && error != -ENODATA) |
1053 | return error; | |
1054 | is->s.not_found = error; | |
1055 | } | |
1056 | return 0; | |
1057 | } | |
1058 | ||
0d812f77 TM |
1059 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
1060 | struct ext4_xattr_info *i, | |
1061 | struct ext4_xattr_ibody_find *is) | |
1062 | { | |
1063 | struct ext4_xattr_ibody_header *header; | |
1064 | struct ext4_xattr_search *s = &is->s; | |
1065 | int error; | |
1066 | ||
1067 | if (EXT4_I(inode)->i_extra_isize == 0) | |
1068 | return -ENOSPC; | |
1069 | error = ext4_xattr_set_entry(i, s); | |
1070 | if (error) { | |
1071 | if (error == -ENOSPC && | |
1072 | ext4_has_inline_data(inode)) { | |
1073 | error = ext4_try_to_evict_inline_data(handle, inode, | |
1074 | EXT4_XATTR_LEN(strlen(i->name) + | |
1075 | EXT4_XATTR_SIZE(i->value_len))); | |
1076 | if (error) | |
1077 | return error; | |
1078 | error = ext4_xattr_ibody_find(inode, i, is); | |
1079 | if (error) | |
1080 | return error; | |
1081 | error = ext4_xattr_set_entry(i, s); | |
1082 | } | |
1083 | if (error) | |
1084 | return error; | |
1085 | } | |
1086 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); | |
1087 | if (!IS_LAST_ENTRY(s->first)) { | |
1088 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
1089 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
1090 | } else { | |
1091 | header->h_magic = cpu_to_le32(0); | |
1092 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
1093 | } | |
1094 | return 0; | |
1095 | } | |
1096 | ||
d5c8dab6 | 1097 | static int ext4_xattr_ibody_set(struct inode *inode, |
0d812f77 TM |
1098 | struct ext4_xattr_info *i, |
1099 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 1100 | { |
617ba13b MC |
1101 | struct ext4_xattr_ibody_header *header; |
1102 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
1103 | int error; |
1104 | ||
617ba13b | 1105 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 1106 | return -ENOSPC; |
617ba13b | 1107 | error = ext4_xattr_set_entry(i, s); |
ac27a0ec DK |
1108 | if (error) |
1109 | return error; | |
617ba13b | 1110 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 1111 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 1112 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 1113 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1114 | } else { |
1115 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 1116 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
1117 | } |
1118 | return 0; | |
1119 | } | |
1120 | ||
3fd16462 JK |
1121 | static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
1122 | struct ext4_xattr_info *i) | |
1123 | { | |
1124 | void *value; | |
1125 | ||
1126 | if (le32_to_cpu(s->here->e_value_size) != i->value_len) | |
1127 | return 0; | |
1128 | value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); | |
1129 | return !memcmp(value, i->value, i->value_len); | |
1130 | } | |
1131 | ||
ac27a0ec | 1132 | /* |
617ba13b | 1133 | * ext4_xattr_set_handle() |
ac27a0ec | 1134 | * |
6e9510b0 | 1135 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
1136 | * is NULL to remove an existing extended attribute, and non-NULL to |
1137 | * either replace an existing extended attribute, or create a new extended | |
1138 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
1139 | * specify that an extended attribute must exist and must not exist | |
1140 | * previous to the call, respectively. | |
1141 | * | |
1142 | * Returns 0, or a negative error number on failure. | |
1143 | */ | |
1144 | int | |
617ba13b | 1145 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
1146 | const char *name, const void *value, size_t value_len, |
1147 | int flags) | |
1148 | { | |
617ba13b | 1149 | struct ext4_xattr_info i = { |
ac27a0ec DK |
1150 | .name_index = name_index, |
1151 | .name = name, | |
1152 | .value = value, | |
1153 | .value_len = value_len, | |
1154 | ||
1155 | }; | |
617ba13b | 1156 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
1157 | .s = { .not_found = -ENODATA, }, |
1158 | }; | |
617ba13b | 1159 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
1160 | .s = { .not_found = -ENODATA, }, |
1161 | }; | |
c755e251 | 1162 | int no_expand; |
ac27a0ec DK |
1163 | int error; |
1164 | ||
1165 | if (!name) | |
1166 | return -EINVAL; | |
1167 | if (strlen(name) > 255) | |
1168 | return -ERANGE; | |
c755e251 | 1169 | ext4_write_lock_xattr(inode, &no_expand); |
4d20c685 | 1170 | |
66543617 | 1171 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
1172 | if (error) |
1173 | goto cleanup; | |
1174 | ||
19f5fb7a | 1175 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
1176 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
1177 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 1178 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
1179 | } |
1180 | ||
617ba13b | 1181 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
1182 | if (error) |
1183 | goto cleanup; | |
1184 | if (is.s.not_found) | |
617ba13b | 1185 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
1186 | if (error) |
1187 | goto cleanup; | |
1188 | if (is.s.not_found && bs.s.not_found) { | |
1189 | error = -ENODATA; | |
1190 | if (flags & XATTR_REPLACE) | |
1191 | goto cleanup; | |
1192 | error = 0; | |
1193 | if (!value) | |
1194 | goto cleanup; | |
1195 | } else { | |
1196 | error = -EEXIST; | |
1197 | if (flags & XATTR_CREATE) | |
1198 | goto cleanup; | |
1199 | } | |
ac27a0ec DK |
1200 | if (!value) { |
1201 | if (!is.s.not_found) | |
d5c8dab6 | 1202 | error = ext4_xattr_ibody_set(inode, &i, &is); |
ac27a0ec | 1203 | else if (!bs.s.not_found) |
617ba13b | 1204 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1205 | } else { |
3fd16462 JK |
1206 | error = 0; |
1207 | /* Xattr value did not change? Save us some work and bail out */ | |
1208 | if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) | |
1209 | goto cleanup; | |
1210 | if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) | |
1211 | goto cleanup; | |
1212 | ||
d5c8dab6 | 1213 | error = ext4_xattr_ibody_set(inode, &i, &is); |
ac27a0ec DK |
1214 | if (!error && !bs.s.not_found) { |
1215 | i.value = NULL; | |
617ba13b | 1216 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 1217 | } else if (error == -ENOSPC) { |
7e01c8e5 TY |
1218 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
1219 | error = ext4_xattr_block_find(inode, &i, &bs); | |
1220 | if (error) | |
1221 | goto cleanup; | |
1222 | } | |
617ba13b | 1223 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec DK |
1224 | if (error) |
1225 | goto cleanup; | |
1226 | if (!is.s.not_found) { | |
1227 | i.value = NULL; | |
d5c8dab6 | 1228 | error = ext4_xattr_ibody_set(inode, &i, &is); |
ac27a0ec DK |
1229 | } |
1230 | } | |
1231 | } | |
1232 | if (!error) { | |
617ba13b | 1233 | ext4_xattr_update_super_block(handle, inode->i_sb); |
eeca7ea1 | 1234 | inode->i_ctime = current_time(inode); |
6dd4ee7c | 1235 | if (!value) |
c755e251 | 1236 | no_expand = 0; |
617ba13b | 1237 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 1238 | /* |
617ba13b | 1239 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
1240 | * error != 0. |
1241 | */ | |
1242 | is.iloc.bh = NULL; | |
1243 | if (IS_SYNC(inode)) | |
0390131b | 1244 | ext4_handle_sync(handle); |
ac27a0ec DK |
1245 | } |
1246 | ||
1247 | cleanup: | |
1248 | brelse(is.iloc.bh); | |
1249 | brelse(bs.bh); | |
c755e251 | 1250 | ext4_write_unlock_xattr(inode, &no_expand); |
ac27a0ec DK |
1251 | return error; |
1252 | } | |
1253 | ||
1254 | /* | |
617ba13b | 1255 | * ext4_xattr_set() |
ac27a0ec | 1256 | * |
617ba13b | 1257 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
1258 | * attribute modification is a filesystem transaction by itself. |
1259 | * | |
1260 | * Returns 0, or a negative error number on failure. | |
1261 | */ | |
1262 | int | |
617ba13b | 1263 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
1264 | const void *value, size_t value_len, int flags) |
1265 | { | |
1266 | handle_t *handle; | |
1267 | int error, retries = 0; | |
95eaefbd | 1268 | int credits = ext4_jbd2_credits_xattr(inode); |
ac27a0ec DK |
1269 | |
1270 | retry: | |
9924a92a | 1271 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
1272 | if (IS_ERR(handle)) { |
1273 | error = PTR_ERR(handle); | |
1274 | } else { | |
1275 | int error2; | |
1276 | ||
617ba13b | 1277 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 1278 | value, value_len, flags); |
617ba13b | 1279 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 1280 | if (error == -ENOSPC && |
617ba13b | 1281 | ext4_should_retry_alloc(inode->i_sb, &retries)) |
ac27a0ec DK |
1282 | goto retry; |
1283 | if (error == 0) | |
1284 | error = error2; | |
1285 | } | |
1286 | ||
1287 | return error; | |
1288 | } | |
1289 | ||
6dd4ee7c KS |
1290 | /* |
1291 | * Shift the EA entries in the inode to create space for the increased | |
1292 | * i_extra_isize. | |
1293 | */ | |
1294 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
1295 | int value_offs_shift, void *to, | |
94405713 | 1296 | void *from, size_t n) |
6dd4ee7c KS |
1297 | { |
1298 | struct ext4_xattr_entry *last = entry; | |
1299 | int new_offs; | |
1300 | ||
94405713 JK |
1301 | /* We always shift xattr headers further thus offsets get lower */ |
1302 | BUG_ON(value_offs_shift > 0); | |
1303 | ||
6dd4ee7c KS |
1304 | /* Adjust the value offsets of the entries */ |
1305 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1cba4237 | 1306 | if (last->e_value_size) { |
6dd4ee7c KS |
1307 | new_offs = le16_to_cpu(last->e_value_offs) + |
1308 | value_offs_shift; | |
6dd4ee7c KS |
1309 | last->e_value_offs = cpu_to_le16(new_offs); |
1310 | } | |
1311 | } | |
1312 | /* Shift the entries by n bytes */ | |
1313 | memmove(to, from, n); | |
1314 | } | |
1315 | ||
3f2571c1 JK |
1316 | /* |
1317 | * Move xattr pointed to by 'entry' from inode into external xattr block | |
1318 | */ | |
1319 | static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, | |
1320 | struct ext4_inode *raw_inode, | |
1321 | struct ext4_xattr_entry *entry) | |
1322 | { | |
1323 | struct ext4_xattr_ibody_find *is = NULL; | |
1324 | struct ext4_xattr_block_find *bs = NULL; | |
1325 | char *buffer = NULL, *b_entry_name = NULL; | |
1326 | size_t value_offs, value_size; | |
1327 | struct ext4_xattr_info i = { | |
1328 | .value = NULL, | |
1329 | .value_len = 0, | |
1330 | .name_index = entry->e_name_index, | |
1331 | }; | |
1332 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
1333 | int error; | |
1334 | ||
1335 | value_offs = le16_to_cpu(entry->e_value_offs); | |
1336 | value_size = le32_to_cpu(entry->e_value_size); | |
1337 | ||
1338 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); | |
1339 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
1340 | buffer = kmalloc(value_size, GFP_NOFS); | |
1341 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
1342 | if (!is || !bs || !buffer || !b_entry_name) { | |
1343 | error = -ENOMEM; | |
1344 | goto out; | |
1345 | } | |
1346 | ||
1347 | is->s.not_found = -ENODATA; | |
1348 | bs->s.not_found = -ENODATA; | |
1349 | is->iloc.bh = NULL; | |
1350 | bs->bh = NULL; | |
1351 | ||
1352 | /* Save the entry name and the entry value */ | |
1353 | memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); | |
1354 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); | |
1355 | b_entry_name[entry->e_name_len] = '\0'; | |
1356 | i.name = b_entry_name; | |
1357 | ||
1358 | error = ext4_get_inode_loc(inode, &is->iloc); | |
1359 | if (error) | |
1360 | goto out; | |
1361 | ||
1362 | error = ext4_xattr_ibody_find(inode, &i, is); | |
1363 | if (error) | |
1364 | goto out; | |
1365 | ||
1366 | /* Remove the chosen entry from the inode */ | |
d5c8dab6 | 1367 | error = ext4_xattr_ibody_set(inode, &i, is); |
3f2571c1 JK |
1368 | if (error) |
1369 | goto out; | |
1370 | ||
1371 | i.name = b_entry_name; | |
1372 | i.value = buffer; | |
1373 | i.value_len = value_size; | |
1374 | error = ext4_xattr_block_find(inode, &i, bs); | |
1375 | if (error) | |
1376 | goto out; | |
1377 | ||
1378 | /* Add entry which was removed from the inode into the block */ | |
1379 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
1380 | if (error) | |
1381 | goto out; | |
1382 | error = 0; | |
1383 | out: | |
1384 | kfree(b_entry_name); | |
1385 | kfree(buffer); | |
1386 | if (is) | |
1387 | brelse(is->iloc.bh); | |
1388 | kfree(is); | |
1389 | kfree(bs); | |
1390 | ||
1391 | return error; | |
1392 | } | |
1393 | ||
dfa2064b JK |
1394 | static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, |
1395 | struct ext4_inode *raw_inode, | |
1396 | int isize_diff, size_t ifree, | |
1397 | size_t bfree, int *total_ino) | |
1398 | { | |
1399 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
1400 | struct ext4_xattr_entry *small_entry; | |
1401 | struct ext4_xattr_entry *entry; | |
1402 | struct ext4_xattr_entry *last; | |
1403 | unsigned int entry_size; /* EA entry size */ | |
1404 | unsigned int total_size; /* EA entry size + value size */ | |
1405 | unsigned int min_total_size; | |
1406 | int error; | |
1407 | ||
1408 | while (isize_diff > ifree) { | |
1409 | entry = NULL; | |
1410 | small_entry = NULL; | |
1411 | min_total_size = ~0U; | |
1412 | last = IFIRST(header); | |
1413 | /* Find the entry best suited to be pushed into EA block */ | |
1414 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
1415 | total_size = | |
1416 | EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + | |
1417 | EXT4_XATTR_LEN(last->e_name_len); | |
1418 | if (total_size <= bfree && | |
1419 | total_size < min_total_size) { | |
1420 | if (total_size + ifree < isize_diff) { | |
1421 | small_entry = last; | |
1422 | } else { | |
1423 | entry = last; | |
1424 | min_total_size = total_size; | |
1425 | } | |
1426 | } | |
1427 | } | |
1428 | ||
1429 | if (entry == NULL) { | |
1430 | if (small_entry == NULL) | |
1431 | return -ENOSPC; | |
1432 | entry = small_entry; | |
1433 | } | |
1434 | ||
1435 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
1436 | total_size = entry_size + | |
1437 | EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)); | |
1438 | error = ext4_xattr_move_to_block(handle, inode, raw_inode, | |
1439 | entry); | |
1440 | if (error) | |
1441 | return error; | |
1442 | ||
1443 | *total_ino -= entry_size; | |
1444 | ifree += total_size; | |
1445 | bfree -= total_size; | |
1446 | } | |
1447 | ||
1448 | return 0; | |
1449 | } | |
1450 | ||
6dd4ee7c KS |
1451 | /* |
1452 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
1453 | * Returns 0 on success or negative error number on failure. | |
1454 | */ | |
1455 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
1456 | struct ext4_inode *raw_inode, handle_t *handle) | |
1457 | { | |
1458 | struct ext4_xattr_ibody_header *header; | |
6dd4ee7c | 1459 | struct buffer_head *bh = NULL; |
e3014d14 JK |
1460 | size_t min_offs; |
1461 | size_t ifree, bfree; | |
7b1b2c1b | 1462 | int total_ino; |
6e0cd088 | 1463 | void *base, *end; |
d0141191 | 1464 | int error = 0, tried_min_extra_isize = 0; |
ac39849d | 1465 | int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); |
d0141191 | 1466 | int isize_diff; /* How much do we need to grow i_extra_isize */ |
c755e251 TT |
1467 | int no_expand; |
1468 | ||
1469 | if (ext4_write_trylock_xattr(inode, &no_expand) == 0) | |
1470 | return 0; | |
6dd4ee7c | 1471 | |
6dd4ee7c | 1472 | retry: |
d0141191 | 1473 | isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; |
2e81a4ee JK |
1474 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) |
1475 | goto out; | |
6dd4ee7c KS |
1476 | |
1477 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
1478 | |
1479 | /* | |
1480 | * Check if enough free space is available in the inode to shift the | |
1481 | * entries ahead by new_extra_isize. | |
1482 | */ | |
1483 | ||
6e0cd088 | 1484 | base = IFIRST(header); |
6dd4ee7c KS |
1485 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
1486 | min_offs = end - base; | |
6dd4ee7c KS |
1487 | total_ino = sizeof(struct ext4_xattr_ibody_header); |
1488 | ||
9e92f48c TT |
1489 | error = xattr_check_inode(inode, header, end); |
1490 | if (error) | |
1491 | goto cleanup; | |
1492 | ||
6e0cd088 | 1493 | ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); |
e3014d14 JK |
1494 | if (ifree >= isize_diff) |
1495 | goto shift; | |
6dd4ee7c KS |
1496 | |
1497 | /* | |
1498 | * Enough free space isn't available in the inode, check if | |
1499 | * EA block can hold new_extra_isize bytes. | |
1500 | */ | |
1501 | if (EXT4_I(inode)->i_file_acl) { | |
1502 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
1503 | error = -EIO; | |
1504 | if (!bh) | |
1505 | goto cleanup; | |
cc8e94fd | 1506 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
1507 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1508 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 1509 | error = -EFSCORRUPTED; |
6dd4ee7c KS |
1510 | goto cleanup; |
1511 | } | |
1512 | base = BHDR(bh); | |
6dd4ee7c KS |
1513 | end = bh->b_data + bh->b_size; |
1514 | min_offs = end - base; | |
6e0cd088 JK |
1515 | bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, |
1516 | NULL); | |
e3014d14 | 1517 | if (bfree + ifree < isize_diff) { |
6dd4ee7c KS |
1518 | if (!tried_min_extra_isize && s_min_extra_isize) { |
1519 | tried_min_extra_isize++; | |
1520 | new_extra_isize = s_min_extra_isize; | |
1521 | brelse(bh); | |
1522 | goto retry; | |
1523 | } | |
dfa2064b | 1524 | error = -ENOSPC; |
6dd4ee7c KS |
1525 | goto cleanup; |
1526 | } | |
1527 | } else { | |
e3014d14 | 1528 | bfree = inode->i_sb->s_blocksize; |
6dd4ee7c KS |
1529 | } |
1530 | ||
dfa2064b JK |
1531 | error = ext4_xattr_make_inode_space(handle, inode, raw_inode, |
1532 | isize_diff, ifree, bfree, | |
1533 | &total_ino); | |
1534 | if (error) { | |
1535 | if (error == -ENOSPC && !tried_min_extra_isize && | |
1536 | s_min_extra_isize) { | |
1537 | tried_min_extra_isize++; | |
1538 | new_extra_isize = s_min_extra_isize; | |
1539 | brelse(bh); | |
1540 | goto retry; | |
6dd4ee7c | 1541 | } |
dfa2064b | 1542 | goto cleanup; |
6dd4ee7c | 1543 | } |
e3014d14 JK |
1544 | shift: |
1545 | /* Adjust the offsets and shift the remaining entries ahead */ | |
6e0cd088 | 1546 | ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize |
e3014d14 JK |
1547 | - new_extra_isize, (void *)raw_inode + |
1548 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
94405713 | 1549 | (void *)header, total_ino); |
e3014d14 | 1550 | EXT4_I(inode)->i_extra_isize = new_extra_isize; |
6dd4ee7c | 1551 | brelse(bh); |
2e81a4ee | 1552 | out: |
c755e251 | 1553 | ext4_write_unlock_xattr(inode, &no_expand); |
6dd4ee7c KS |
1554 | return 0; |
1555 | ||
1556 | cleanup: | |
6dd4ee7c | 1557 | brelse(bh); |
2e81a4ee | 1558 | /* |
c755e251 | 1559 | * Inode size expansion failed; don't try again |
2e81a4ee | 1560 | */ |
c755e251 TT |
1561 | no_expand = 1; |
1562 | ext4_write_unlock_xattr(inode, &no_expand); | |
6dd4ee7c KS |
1563 | return error; |
1564 | } | |
1565 | ||
1566 | ||
1567 | ||
ac27a0ec | 1568 | /* |
617ba13b | 1569 | * ext4_xattr_delete_inode() |
ac27a0ec DK |
1570 | * |
1571 | * Free extended attribute resources associated with this inode. This | |
1572 | * is called immediately before an inode is freed. We have exclusive | |
1573 | * access to the inode. | |
1574 | */ | |
1575 | void | |
617ba13b | 1576 | ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) |
ac27a0ec DK |
1577 | { |
1578 | struct buffer_head *bh = NULL; | |
1579 | ||
617ba13b | 1580 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 1581 | goto cleanup; |
617ba13b | 1582 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec | 1583 | if (!bh) { |
24676da4 TT |
1584 | EXT4_ERROR_INODE(inode, "block %llu read error", |
1585 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1586 | goto cleanup; |
1587 | } | |
617ba13b | 1588 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 1589 | BHDR(bh)->h_blocks != cpu_to_le32(1)) { |
24676da4 TT |
1590 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1591 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
1592 | goto cleanup; |
1593 | } | |
617ba13b MC |
1594 | ext4_xattr_release_block(handle, inode, bh); |
1595 | EXT4_I(inode)->i_file_acl = 0; | |
ac27a0ec DK |
1596 | |
1597 | cleanup: | |
1598 | brelse(bh); | |
1599 | } | |
1600 | ||
ac27a0ec | 1601 | /* |
617ba13b | 1602 | * ext4_xattr_cache_insert() |
ac27a0ec DK |
1603 | * |
1604 | * Create a new entry in the extended attribute cache, and insert | |
1605 | * it unless such an entry is already in the cache. | |
1606 | * | |
1607 | * Returns 0, or a negative error number on failure. | |
1608 | */ | |
1609 | static void | |
7a2508e1 | 1610 | ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) |
ac27a0ec | 1611 | { |
6048c64b AG |
1612 | struct ext4_xattr_header *header = BHDR(bh); |
1613 | __u32 hash = le32_to_cpu(header->h_hash); | |
1614 | int reusable = le32_to_cpu(header->h_refcount) < | |
1615 | EXT4_XATTR_REFCOUNT_MAX; | |
ac27a0ec DK |
1616 | int error; |
1617 | ||
7a2508e1 | 1618 | error = mb_cache_entry_create(ext4_mb_cache, GFP_NOFS, hash, |
6048c64b | 1619 | bh->b_blocknr, reusable); |
ac27a0ec | 1620 | if (error) { |
82939d79 | 1621 | if (error == -EBUSY) |
ac27a0ec | 1622 | ea_bdebug(bh, "already in cache"); |
82939d79 | 1623 | } else |
ac27a0ec | 1624 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
1625 | } |
1626 | ||
1627 | /* | |
617ba13b | 1628 | * ext4_xattr_cmp() |
ac27a0ec DK |
1629 | * |
1630 | * Compare two extended attribute blocks for equality. | |
1631 | * | |
1632 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
1633 | * a negative error number on errors. | |
1634 | */ | |
1635 | static int | |
617ba13b MC |
1636 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
1637 | struct ext4_xattr_header *header2) | |
ac27a0ec | 1638 | { |
617ba13b | 1639 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
1640 | |
1641 | entry1 = ENTRY(header1+1); | |
1642 | entry2 = ENTRY(header2+1); | |
1643 | while (!IS_LAST_ENTRY(entry1)) { | |
1644 | if (IS_LAST_ENTRY(entry2)) | |
1645 | return 1; | |
1646 | if (entry1->e_hash != entry2->e_hash || | |
1647 | entry1->e_name_index != entry2->e_name_index || | |
1648 | entry1->e_name_len != entry2->e_name_len || | |
1649 | entry1->e_value_size != entry2->e_value_size || | |
1650 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) | |
1651 | return 1; | |
1652 | if (entry1->e_value_block != 0 || entry2->e_value_block != 0) | |
6a797d27 | 1653 | return -EFSCORRUPTED; |
ac27a0ec DK |
1654 | if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), |
1655 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), | |
1656 | le32_to_cpu(entry1->e_value_size))) | |
1657 | return 1; | |
1658 | ||
617ba13b MC |
1659 | entry1 = EXT4_XATTR_NEXT(entry1); |
1660 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
1661 | } |
1662 | if (!IS_LAST_ENTRY(entry2)) | |
1663 | return 1; | |
1664 | return 0; | |
1665 | } | |
1666 | ||
1667 | /* | |
617ba13b | 1668 | * ext4_xattr_cache_find() |
ac27a0ec DK |
1669 | * |
1670 | * Find an identical extended attribute block. | |
1671 | * | |
1672 | * Returns a pointer to the block found, or NULL if such a block was | |
1673 | * not found or an error occurred. | |
1674 | */ | |
1675 | static struct buffer_head * | |
617ba13b | 1676 | ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, |
7a2508e1 | 1677 | struct mb_cache_entry **pce) |
ac27a0ec DK |
1678 | { |
1679 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 JK |
1680 | struct mb_cache_entry *ce; |
1681 | struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); | |
ac27a0ec DK |
1682 | |
1683 | if (!header->h_hash) | |
1684 | return NULL; /* never share */ | |
1685 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
7a2508e1 | 1686 | ce = mb_cache_entry_find_first(ext4_mb_cache, hash); |
ac27a0ec DK |
1687 | while (ce) { |
1688 | struct buffer_head *bh; | |
1689 | ||
ac27a0ec DK |
1690 | bh = sb_bread(inode->i_sb, ce->e_block); |
1691 | if (!bh) { | |
24676da4 TT |
1692 | EXT4_ERROR_INODE(inode, "block %lu read error", |
1693 | (unsigned long) ce->e_block); | |
617ba13b | 1694 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
ac27a0ec DK |
1695 | *pce = ce; |
1696 | return bh; | |
1697 | } | |
1698 | brelse(bh); | |
7a2508e1 | 1699 | ce = mb_cache_entry_find_next(ext4_mb_cache, ce); |
ac27a0ec DK |
1700 | } |
1701 | return NULL; | |
1702 | } | |
1703 | ||
1704 | #define NAME_HASH_SHIFT 5 | |
1705 | #define VALUE_HASH_SHIFT 16 | |
1706 | ||
1707 | /* | |
617ba13b | 1708 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
1709 | * |
1710 | * Compute the hash of an extended attribute. | |
1711 | */ | |
617ba13b MC |
1712 | static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, |
1713 | struct ext4_xattr_entry *entry) | |
ac27a0ec DK |
1714 | { |
1715 | __u32 hash = 0; | |
1716 | char *name = entry->e_name; | |
1717 | int n; | |
1718 | ||
2b2d6d01 | 1719 | for (n = 0; n < entry->e_name_len; n++) { |
ac27a0ec DK |
1720 | hash = (hash << NAME_HASH_SHIFT) ^ |
1721 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
1722 | *name++; | |
1723 | } | |
1724 | ||
1cba4237 | 1725 | if (entry->e_value_size != 0) { |
ac27a0ec DK |
1726 | __le32 *value = (__le32 *)((char *)header + |
1727 | le16_to_cpu(entry->e_value_offs)); | |
1728 | for (n = (le32_to_cpu(entry->e_value_size) + | |
617ba13b | 1729 | EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { |
ac27a0ec DK |
1730 | hash = (hash << VALUE_HASH_SHIFT) ^ |
1731 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
1732 | le32_to_cpu(*value++); | |
1733 | } | |
1734 | } | |
1735 | entry->e_hash = cpu_to_le32(hash); | |
1736 | } | |
1737 | ||
1738 | #undef NAME_HASH_SHIFT | |
1739 | #undef VALUE_HASH_SHIFT | |
1740 | ||
1741 | #define BLOCK_HASH_SHIFT 16 | |
1742 | ||
1743 | /* | |
617ba13b | 1744 | * ext4_xattr_rehash() |
ac27a0ec DK |
1745 | * |
1746 | * Re-compute the extended attribute hash value after an entry has changed. | |
1747 | */ | |
617ba13b MC |
1748 | static void ext4_xattr_rehash(struct ext4_xattr_header *header, |
1749 | struct ext4_xattr_entry *entry) | |
ac27a0ec | 1750 | { |
617ba13b | 1751 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
1752 | __u32 hash = 0; |
1753 | ||
617ba13b | 1754 | ext4_xattr_hash_entry(header, entry); |
ac27a0ec DK |
1755 | here = ENTRY(header+1); |
1756 | while (!IS_LAST_ENTRY(here)) { | |
1757 | if (!here->e_hash) { | |
1758 | /* Block is not shared if an entry's hash value == 0 */ | |
1759 | hash = 0; | |
1760 | break; | |
1761 | } | |
1762 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
1763 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
1764 | le32_to_cpu(here->e_hash); | |
617ba13b | 1765 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
1766 | } |
1767 | header->h_hash = cpu_to_le32(hash); | |
1768 | } | |
1769 | ||
1770 | #undef BLOCK_HASH_SHIFT | |
1771 | ||
9c191f70 M |
1772 | #define HASH_BUCKET_BITS 10 |
1773 | ||
7a2508e1 | 1774 | struct mb_cache * |
82939d79 | 1775 | ext4_xattr_create_cache(void) |
ac27a0ec | 1776 | { |
7a2508e1 | 1777 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
1778 | } |
1779 | ||
7a2508e1 | 1780 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 1781 | { |
9c191f70 | 1782 | if (cache) |
7a2508e1 | 1783 | mb_cache_destroy(cache); |
ac27a0ec | 1784 | } |
9c191f70 | 1785 |