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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ac27a0ec | 2 | /* |
617ba13b | 3 | * linux/fs/ext4/xattr.c |
ac27a0ec DK |
4 | * |
5 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> | |
6 | * | |
7 | * Fix by Harrison Xing <harrison@mountainviewdata.com>. | |
617ba13b | 8 | * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>. |
ac27a0ec DK |
9 | * Extended attributes for symlinks and special files added per |
10 | * suggestion of Luka Renko <luka.renko@hermes.si>. | |
11 | * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, | |
12 | * Red Hat Inc. | |
13 | * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz | |
14 | * and Andreas Gruenbacher <agruen@suse.de>. | |
15 | */ | |
16 | ||
17 | /* | |
18 | * Extended attributes are stored directly in inodes (on file systems with | |
19 | * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl | |
20 | * field contains the block number if an inode uses an additional block. All | |
21 | * attributes must fit in the inode and one additional block. Blocks that | |
22 | * contain the identical set of attributes may be shared among several inodes. | |
23 | * Identical blocks are detected by keeping a cache of blocks that have | |
24 | * recently been accessed. | |
25 | * | |
26 | * The attributes in inodes and on blocks have a different header; the entries | |
27 | * are stored in the same format: | |
28 | * | |
29 | * +------------------+ | |
30 | * | header | | |
31 | * | entry 1 | | | |
32 | * | entry 2 | | growing downwards | |
33 | * | entry 3 | v | |
34 | * | four null bytes | | |
35 | * | . . . | | |
36 | * | value 1 | ^ | |
37 | * | value 3 | | growing upwards | |
38 | * | value 2 | | | |
39 | * +------------------+ | |
40 | * | |
41 | * The header is followed by multiple entry descriptors. In disk blocks, the | |
42 | * entry descriptors are kept sorted. In inodes, they are unsorted. The | |
43 | * attribute values are aligned to the end of the block in no specific order. | |
44 | * | |
45 | * Locking strategy | |
46 | * ---------------- | |
617ba13b | 47 | * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem. |
ac27a0ec DK |
48 | * EA blocks are only changed if they are exclusive to an inode, so |
49 | * holding xattr_sem also means that nothing but the EA block's reference | |
50 | * count can change. Multiple writers to the same block are synchronized | |
51 | * by the buffer lock. | |
52 | */ | |
53 | ||
54 | #include <linux/init.h> | |
55 | #include <linux/fs.h> | |
56 | #include <linux/slab.h> | |
7a2508e1 | 57 | #include <linux/mbcache.h> |
ac27a0ec | 58 | #include <linux/quotaops.h> |
ee73f9a5 | 59 | #include <linux/iversion.h> |
3dcf5451 CH |
60 | #include "ext4_jbd2.h" |
61 | #include "ext4.h" | |
ac27a0ec DK |
62 | #include "xattr.h" |
63 | #include "acl.h" | |
64 | ||
617ba13b | 65 | #ifdef EXT4_XATTR_DEBUG |
d74f3d25 JP |
66 | # define ea_idebug(inode, fmt, ...) \ |
67 | printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \ | |
68 | inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__) | |
69 | # define ea_bdebug(bh, fmt, ...) \ | |
70 | printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \ | |
71 | bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__) | |
ac27a0ec | 72 | #else |
ace36ad4 JP |
73 | # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
74 | # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) | |
ac27a0ec DK |
75 | #endif |
76 | ||
47387409 TE |
77 | static void ext4_xattr_block_cache_insert(struct mb_cache *, |
78 | struct buffer_head *); | |
79 | static struct buffer_head * | |
80 | ext4_xattr_block_cache_find(struct inode *, struct ext4_xattr_header *, | |
81 | struct mb_cache_entry **); | |
b9fc761e TE |
82 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
83 | size_t value_count); | |
daf83281 | 84 | static void ext4_xattr_rehash(struct ext4_xattr_header *); |
ac27a0ec | 85 | |
d6006186 | 86 | static const struct xattr_handler * const ext4_xattr_handler_map[] = { |
617ba13b | 87 | [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, |
03010a33 | 88 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
89 | [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
90 | [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, | |
ac27a0ec | 91 | #endif |
617ba13b | 92 | [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, |
03010a33 | 93 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 94 | [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, |
ac27a0ec DK |
95 | #endif |
96 | }; | |
97 | ||
11e27528 | 98 | const struct xattr_handler *ext4_xattr_handlers[] = { |
617ba13b MC |
99 | &ext4_xattr_user_handler, |
100 | &ext4_xattr_trusted_handler, | |
03010a33 | 101 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
102 | &posix_acl_access_xattr_handler, |
103 | &posix_acl_default_xattr_handler, | |
ac27a0ec | 104 | #endif |
03010a33 | 105 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 106 | &ext4_xattr_security_handler, |
ac27a0ec DK |
107 | #endif |
108 | NULL | |
109 | }; | |
110 | ||
47387409 TE |
111 | #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ |
112 | inode->i_sb->s_fs_info)->s_ea_block_cache) | |
9c191f70 | 113 | |
dec214d0 TE |
114 | #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ |
115 | inode->i_sb->s_fs_info)->s_ea_inode_cache) | |
116 | ||
30a7eb97 TE |
117 | static int |
118 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, | |
119 | struct inode *inode); | |
120 | ||
33d201e0 TE |
121 | #ifdef CONFIG_LOCKDEP |
122 | void ext4_xattr_inode_set_class(struct inode *ea_inode) | |
123 | { | |
124 | lockdep_set_subclass(&ea_inode->i_rwsem, 1); | |
125 | } | |
126 | #endif | |
127 | ||
cc8e94fd DW |
128 | static __le32 ext4_xattr_block_csum(struct inode *inode, |
129 | sector_t block_nr, | |
130 | struct ext4_xattr_header *hdr) | |
131 | { | |
132 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
d6a77105 | 133 | __u32 csum; |
d6a77105 | 134 | __le64 dsk_block_nr = cpu_to_le64(block_nr); |
b47820ed DJ |
135 | __u32 dummy_csum = 0; |
136 | int offset = offsetof(struct ext4_xattr_header, h_checksum); | |
cc8e94fd | 137 | |
d6a77105 TT |
138 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, |
139 | sizeof(dsk_block_nr)); | |
b47820ed DJ |
140 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); |
141 | csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); | |
142 | offset += sizeof(dummy_csum); | |
143 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, | |
144 | EXT4_BLOCK_SIZE(inode->i_sb) - offset); | |
41eb70dd | 145 | |
cc8e94fd DW |
146 | return cpu_to_le32(csum); |
147 | } | |
148 | ||
149 | static int ext4_xattr_block_csum_verify(struct inode *inode, | |
dac7a4b4 | 150 | struct buffer_head *bh) |
cc8e94fd | 151 | { |
dac7a4b4 TT |
152 | struct ext4_xattr_header *hdr = BHDR(bh); |
153 | int ret = 1; | |
cc8e94fd | 154 | |
dac7a4b4 TT |
155 | if (ext4_has_metadata_csum(inode->i_sb)) { |
156 | lock_buffer(bh); | |
157 | ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, | |
158 | bh->b_blocknr, hdr)); | |
159 | unlock_buffer(bh); | |
160 | } | |
161 | return ret; | |
cc8e94fd DW |
162 | } |
163 | ||
dac7a4b4 TT |
164 | static void ext4_xattr_block_csum_set(struct inode *inode, |
165 | struct buffer_head *bh) | |
cc8e94fd | 166 | { |
dac7a4b4 TT |
167 | if (ext4_has_metadata_csum(inode->i_sb)) |
168 | BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, | |
169 | bh->b_blocknr, BHDR(bh)); | |
cc8e94fd DW |
170 | } |
171 | ||
11e27528 | 172 | static inline const struct xattr_handler * |
617ba13b | 173 | ext4_xattr_handler(int name_index) |
ac27a0ec | 174 | { |
11e27528 | 175 | const struct xattr_handler *handler = NULL; |
ac27a0ec | 176 | |
617ba13b MC |
177 | if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
178 | handler = ext4_xattr_handler_map[name_index]; | |
ac27a0ec DK |
179 | return handler; |
180 | } | |
181 | ||
ac27a0ec | 182 | static int |
2c4f9923 EB |
183 | ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, |
184 | void *value_start) | |
ac27a0ec | 185 | { |
a0626e75 DW |
186 | struct ext4_xattr_entry *e = entry; |
187 | ||
d7614cc1 | 188 | /* Find the end of the names list */ |
a0626e75 DW |
189 | while (!IS_LAST_ENTRY(e)) { |
190 | struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); | |
ac27a0ec | 191 | if ((void *)next >= end) |
6a797d27 | 192 | return -EFSCORRUPTED; |
a0626e75 | 193 | e = next; |
ac27a0ec | 194 | } |
a0626e75 | 195 | |
d7614cc1 | 196 | /* Check the values */ |
a0626e75 | 197 | while (!IS_LAST_ENTRY(entry)) { |
e50e5129 AD |
198 | if (entry->e_value_size != 0 && |
199 | entry->e_value_inum == 0) { | |
d7614cc1 EB |
200 | u16 offs = le16_to_cpu(entry->e_value_offs); |
201 | u32 size = le32_to_cpu(entry->e_value_size); | |
202 | void *value; | |
203 | ||
204 | /* | |
205 | * The value cannot overlap the names, and the value | |
206 | * with padding cannot extend beyond 'end'. Check both | |
207 | * the padded and unpadded sizes, since the size may | |
208 | * overflow to 0 when adding padding. | |
209 | */ | |
210 | if (offs > end - value_start) | |
211 | return -EFSCORRUPTED; | |
212 | value = value_start + offs; | |
213 | if (value < (void *)e + sizeof(u32) || | |
214 | size > end - value || | |
215 | EXT4_XATTR_SIZE(size) > end - value) | |
216 | return -EFSCORRUPTED; | |
217 | } | |
a0626e75 DW |
218 | entry = EXT4_XATTR_NEXT(entry); |
219 | } | |
220 | ||
ac27a0ec DK |
221 | return 0; |
222 | } | |
223 | ||
224 | static inline int | |
cc8e94fd | 225 | ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) |
ac27a0ec | 226 | { |
cc8e94fd DW |
227 | int error; |
228 | ||
229 | if (buffer_verified(bh)) | |
230 | return 0; | |
231 | ||
617ba13b | 232 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 233 | BHDR(bh)->h_blocks != cpu_to_le32(1)) |
6a797d27 | 234 | return -EFSCORRUPTED; |
dac7a4b4 | 235 | if (!ext4_xattr_block_csum_verify(inode, bh)) |
6a797d27 | 236 | return -EFSBADCRC; |
2c4f9923 EB |
237 | error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, |
238 | bh->b_data); | |
cc8e94fd DW |
239 | if (!error) |
240 | set_buffer_verified(bh); | |
241 | return error; | |
ac27a0ec DK |
242 | } |
243 | ||
9e92f48c TT |
244 | static int |
245 | __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, | |
246 | void *end, const char *function, unsigned int line) | |
247 | { | |
9e92f48c TT |
248 | int error = -EFSCORRUPTED; |
249 | ||
290ab230 | 250 | if (end - (void *)header < sizeof(*header) + sizeof(u32) || |
19962509 | 251 | (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) |
9e92f48c | 252 | goto errout; |
2c4f9923 | 253 | error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); |
9e92f48c TT |
254 | errout: |
255 | if (error) | |
256 | __ext4_error_inode(inode, function, line, 0, | |
257 | "corrupted in-inode xattr"); | |
258 | return error; | |
259 | } | |
260 | ||
261 | #define xattr_check_inode(inode, header, end) \ | |
262 | __xattr_check_inode((inode), (header), (end), __func__, __LINE__) | |
263 | ||
ac27a0ec | 264 | static int |
617ba13b | 265 | ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, |
6ba644b9 | 266 | const char *name, int sorted) |
ac27a0ec | 267 | { |
617ba13b | 268 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
269 | size_t name_len; |
270 | int cmp = 1; | |
271 | ||
272 | if (name == NULL) | |
273 | return -EINVAL; | |
274 | name_len = strlen(name); | |
275 | entry = *pentry; | |
617ba13b | 276 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
ac27a0ec DK |
277 | cmp = name_index - entry->e_name_index; |
278 | if (!cmp) | |
279 | cmp = name_len - entry->e_name_len; | |
280 | if (!cmp) | |
281 | cmp = memcmp(name, entry->e_name, name_len); | |
282 | if (cmp <= 0 && (sorted || cmp == 0)) | |
283 | break; | |
284 | } | |
285 | *pentry = entry; | |
ac27a0ec DK |
286 | return cmp ? -ENODATA : 0; |
287 | } | |
288 | ||
dec214d0 TE |
289 | static u32 |
290 | ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) | |
291 | { | |
292 | return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); | |
293 | } | |
294 | ||
295 | static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) | |
296 | { | |
297 | return ((u64)ea_inode->i_ctime.tv_sec << 32) | | |
ee73f9a5 | 298 | (u32) inode_peek_iversion_raw(ea_inode); |
dec214d0 TE |
299 | } |
300 | ||
301 | static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) | |
302 | { | |
303 | ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); | |
ee73f9a5 | 304 | inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); |
dec214d0 TE |
305 | } |
306 | ||
307 | static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) | |
308 | { | |
309 | return (u32)ea_inode->i_atime.tv_sec; | |
310 | } | |
311 | ||
312 | static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) | |
313 | { | |
314 | ea_inode->i_atime.tv_sec = hash; | |
315 | } | |
316 | ||
e50e5129 AD |
317 | /* |
318 | * Read the EA value from an inode. | |
319 | */ | |
90966693 | 320 | static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) |
e50e5129 | 321 | { |
9699d4f9 TE |
322 | int blocksize = 1 << ea_inode->i_blkbits; |
323 | int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; | |
324 | int tail_size = (size % blocksize) ?: blocksize; | |
325 | struct buffer_head *bhs_inline[8]; | |
326 | struct buffer_head **bhs = bhs_inline; | |
327 | int i, ret; | |
328 | ||
329 | if (bh_count > ARRAY_SIZE(bhs_inline)) { | |
330 | bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); | |
331 | if (!bhs) | |
332 | return -ENOMEM; | |
333 | } | |
90966693 | 334 | |
9699d4f9 TE |
335 | ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, |
336 | true /* wait */, bhs); | |
337 | if (ret) | |
338 | goto free_bhs; | |
e50e5129 | 339 | |
9699d4f9 TE |
340 | for (i = 0; i < bh_count; i++) { |
341 | /* There shouldn't be any holes in ea_inode. */ | |
342 | if (!bhs[i]) { | |
343 | ret = -EFSCORRUPTED; | |
344 | goto put_bhs; | |
345 | } | |
346 | memcpy((char *)buf + blocksize * i, bhs[i]->b_data, | |
347 | i < bh_count - 1 ? blocksize : tail_size); | |
e50e5129 | 348 | } |
9699d4f9 TE |
349 | ret = 0; |
350 | put_bhs: | |
351 | for (i = 0; i < bh_count; i++) | |
352 | brelse(bhs[i]); | |
353 | free_bhs: | |
354 | if (bhs != bhs_inline) | |
355 | kfree(bhs); | |
356 | return ret; | |
e50e5129 AD |
357 | } |
358 | ||
a6d05676 TE |
359 | #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) |
360 | ||
bab79b04 | 361 | static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, |
a6d05676 | 362 | u32 ea_inode_hash, struct inode **ea_inode) |
e50e5129 | 363 | { |
bab79b04 TE |
364 | struct inode *inode; |
365 | int err; | |
e50e5129 | 366 | |
bab79b04 TE |
367 | inode = ext4_iget(parent->i_sb, ea_ino); |
368 | if (IS_ERR(inode)) { | |
369 | err = PTR_ERR(inode); | |
dec214d0 TE |
370 | ext4_error(parent->i_sb, |
371 | "error while reading EA inode %lu err=%d", ea_ino, | |
372 | err); | |
bab79b04 | 373 | return err; |
e50e5129 AD |
374 | } |
375 | ||
bab79b04 | 376 | if (is_bad_inode(inode)) { |
dec214d0 TE |
377 | ext4_error(parent->i_sb, |
378 | "error while reading EA inode %lu is_bad_inode", | |
379 | ea_ino); | |
bab79b04 TE |
380 | err = -EIO; |
381 | goto error; | |
382 | } | |
383 | ||
bab79b04 | 384 | if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { |
dec214d0 TE |
385 | ext4_error(parent->i_sb, |
386 | "EA inode %lu does not have EXT4_EA_INODE_FL flag", | |
387 | ea_ino); | |
bab79b04 | 388 | err = -EINVAL; |
e50e5129 AD |
389 | goto error; |
390 | } | |
391 | ||
a6d05676 TE |
392 | ext4_xattr_inode_set_class(inode); |
393 | ||
394 | /* | |
395 | * Check whether this is an old Lustre-style xattr inode. Lustre | |
396 | * implementation does not have hash validation, rather it has a | |
397 | * backpointer from ea_inode to the parent inode. | |
398 | */ | |
399 | if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && | |
400 | EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && | |
401 | inode->i_generation == parent->i_generation) { | |
402 | ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); | |
403 | ext4_xattr_inode_set_ref(inode, 1); | |
404 | } else { | |
405 | inode_lock(inode); | |
406 | inode->i_flags |= S_NOQUOTA; | |
407 | inode_unlock(inode); | |
408 | } | |
409 | ||
bab79b04 TE |
410 | *ea_inode = inode; |
411 | return 0; | |
e50e5129 | 412 | error: |
bab79b04 TE |
413 | iput(inode); |
414 | return err; | |
e50e5129 AD |
415 | } |
416 | ||
dec214d0 | 417 | static int |
b9fc761e TE |
418 | ext4_xattr_inode_verify_hashes(struct inode *ea_inode, |
419 | struct ext4_xattr_entry *entry, void *buffer, | |
420 | size_t size) | |
dec214d0 TE |
421 | { |
422 | u32 hash; | |
423 | ||
424 | /* Verify stored hash matches calculated hash. */ | |
425 | hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); | |
426 | if (hash != ext4_xattr_inode_get_hash(ea_inode)) | |
427 | return -EFSCORRUPTED; | |
b9fc761e TE |
428 | |
429 | if (entry) { | |
430 | __le32 e_hash, tmp_data; | |
431 | ||
432 | /* Verify entry hash. */ | |
433 | tmp_data = cpu_to_le32(hash); | |
434 | e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, | |
435 | &tmp_data, 1); | |
436 | if (e_hash != entry->e_hash) | |
437 | return -EFSCORRUPTED; | |
438 | } | |
dec214d0 TE |
439 | return 0; |
440 | } | |
441 | ||
e50e5129 | 442 | /* |
b9fc761e | 443 | * Read xattr value from the EA inode. |
e50e5129 AD |
444 | */ |
445 | static int | |
b9fc761e TE |
446 | ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, |
447 | void *buffer, size_t size) | |
e50e5129 | 448 | { |
dec214d0 | 449 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); |
bab79b04 | 450 | struct inode *ea_inode; |
dec214d0 | 451 | int err; |
e50e5129 | 452 | |
b9fc761e | 453 | err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), |
a6d05676 | 454 | le32_to_cpu(entry->e_hash), &ea_inode); |
dec214d0 TE |
455 | if (err) { |
456 | ea_inode = NULL; | |
457 | goto out; | |
458 | } | |
e50e5129 | 459 | |
dec214d0 TE |
460 | if (i_size_read(ea_inode) != size) { |
461 | ext4_warning_inode(ea_inode, | |
462 | "ea_inode file size=%llu entry size=%zu", | |
463 | i_size_read(ea_inode), size); | |
464 | err = -EFSCORRUPTED; | |
465 | goto out; | |
466 | } | |
e50e5129 | 467 | |
dec214d0 TE |
468 | err = ext4_xattr_inode_read(ea_inode, buffer, size); |
469 | if (err) | |
470 | goto out; | |
471 | ||
a6d05676 TE |
472 | if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { |
473 | err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, | |
474 | size); | |
475 | if (err) { | |
dec214d0 TE |
476 | ext4_warning_inode(ea_inode, |
477 | "EA inode hash validation failed"); | |
478 | goto out; | |
479 | } | |
dec214d0 | 480 | |
a6d05676 TE |
481 | if (ea_inode_cache) |
482 | mb_cache_entry_create(ea_inode_cache, GFP_NOFS, | |
483 | ext4_xattr_inode_get_hash(ea_inode), | |
484 | ea_inode->i_ino, true /* reusable */); | |
485 | } | |
dec214d0 TE |
486 | out: |
487 | iput(ea_inode); | |
488 | return err; | |
e50e5129 AD |
489 | } |
490 | ||
ac27a0ec | 491 | static int |
617ba13b | 492 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
493 | void *buffer, size_t buffer_size) |
494 | { | |
495 | struct buffer_head *bh = NULL; | |
617ba13b | 496 | struct ext4_xattr_entry *entry; |
ac27a0ec DK |
497 | size_t size; |
498 | int error; | |
47387409 | 499 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec DK |
500 | |
501 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
502 | name_index, name, buffer, (long)buffer_size); | |
503 | ||
504 | error = -ENODATA; | |
617ba13b | 505 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 506 | goto cleanup; |
ace36ad4 JP |
507 | ea_idebug(inode, "reading block %llu", |
508 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 509 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
510 | if (!bh) |
511 | goto cleanup; | |
512 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
513 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 514 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
515 | EXT4_ERROR_INODE(inode, "bad block %llu", |
516 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 517 | error = -EFSCORRUPTED; |
ac27a0ec DK |
518 | goto cleanup; |
519 | } | |
47387409 | 520 | ext4_xattr_block_cache_insert(ea_block_cache, bh); |
ac27a0ec | 521 | entry = BFIRST(bh); |
6ba644b9 | 522 | error = ext4_xattr_find_entry(&entry, name_index, name, 1); |
ac27a0ec DK |
523 | if (error) |
524 | goto cleanup; | |
525 | size = le32_to_cpu(entry->e_value_size); | |
526 | if (buffer) { | |
527 | error = -ERANGE; | |
528 | if (size > buffer_size) | |
529 | goto cleanup; | |
e50e5129 | 530 | if (entry->e_value_inum) { |
b9fc761e TE |
531 | error = ext4_xattr_inode_get(inode, entry, buffer, |
532 | size); | |
e50e5129 AD |
533 | if (error) |
534 | goto cleanup; | |
535 | } else { | |
536 | memcpy(buffer, bh->b_data + | |
537 | le16_to_cpu(entry->e_value_offs), size); | |
538 | } | |
ac27a0ec DK |
539 | } |
540 | error = size; | |
541 | ||
542 | cleanup: | |
543 | brelse(bh); | |
544 | return error; | |
545 | } | |
546 | ||
879b3825 | 547 | int |
617ba13b | 548 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
549 | void *buffer, size_t buffer_size) |
550 | { | |
617ba13b MC |
551 | struct ext4_xattr_ibody_header *header; |
552 | struct ext4_xattr_entry *entry; | |
553 | struct ext4_inode *raw_inode; | |
554 | struct ext4_iloc iloc; | |
ac27a0ec DK |
555 | size_t size; |
556 | void *end; | |
557 | int error; | |
558 | ||
19f5fb7a | 559 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 560 | return -ENODATA; |
617ba13b | 561 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
562 | if (error) |
563 | return error; | |
617ba13b | 564 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 565 | header = IHDR(inode, raw_inode); |
617ba13b | 566 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 567 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
568 | if (error) |
569 | goto cleanup; | |
6ba644b9 EB |
570 | entry = IFIRST(header); |
571 | error = ext4_xattr_find_entry(&entry, name_index, name, 0); | |
ac27a0ec DK |
572 | if (error) |
573 | goto cleanup; | |
574 | size = le32_to_cpu(entry->e_value_size); | |
575 | if (buffer) { | |
576 | error = -ERANGE; | |
577 | if (size > buffer_size) | |
578 | goto cleanup; | |
e50e5129 | 579 | if (entry->e_value_inum) { |
b9fc761e TE |
580 | error = ext4_xattr_inode_get(inode, entry, buffer, |
581 | size); | |
e50e5129 AD |
582 | if (error) |
583 | goto cleanup; | |
584 | } else { | |
585 | memcpy(buffer, (void *)IFIRST(header) + | |
586 | le16_to_cpu(entry->e_value_offs), size); | |
587 | } | |
ac27a0ec DK |
588 | } |
589 | error = size; | |
590 | ||
591 | cleanup: | |
592 | brelse(iloc.bh); | |
593 | return error; | |
594 | } | |
595 | ||
596 | /* | |
617ba13b | 597 | * ext4_xattr_get() |
ac27a0ec DK |
598 | * |
599 | * Copy an extended attribute into the buffer | |
600 | * provided, or compute the buffer size required. | |
601 | * Buffer is NULL to compute the size of the buffer required. | |
602 | * | |
603 | * Returns a negative error number on failure, or the number of bytes | |
604 | * used / required on success. | |
605 | */ | |
606 | int | |
617ba13b | 607 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
608 | void *buffer, size_t buffer_size) |
609 | { | |
610 | int error; | |
611 | ||
0db1ff22 TT |
612 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
613 | return -EIO; | |
614 | ||
230b8c1a ZZ |
615 | if (strlen(name) > 255) |
616 | return -ERANGE; | |
617 | ||
617ba13b MC |
618 | down_read(&EXT4_I(inode)->xattr_sem); |
619 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
620 | buffer_size); |
621 | if (error == -ENODATA) | |
617ba13b | 622 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 623 | buffer_size); |
617ba13b | 624 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
625 | return error; |
626 | } | |
627 | ||
628 | static int | |
431547b3 | 629 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
630 | char *buffer, size_t buffer_size) |
631 | { | |
632 | size_t rest = buffer_size; | |
633 | ||
617ba13b | 634 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 635 | const struct xattr_handler *handler = |
617ba13b | 636 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec | 637 | |
764a5c6b AG |
638 | if (handler && (!handler->list || handler->list(dentry))) { |
639 | const char *prefix = handler->prefix ?: handler->name; | |
640 | size_t prefix_len = strlen(prefix); | |
641 | size_t size = prefix_len + entry->e_name_len + 1; | |
642 | ||
ac27a0ec DK |
643 | if (buffer) { |
644 | if (size > rest) | |
645 | return -ERANGE; | |
764a5c6b AG |
646 | memcpy(buffer, prefix, prefix_len); |
647 | buffer += prefix_len; | |
648 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
649 | buffer += entry->e_name_len; | |
650 | *buffer++ = 0; | |
ac27a0ec DK |
651 | } |
652 | rest -= size; | |
653 | } | |
654 | } | |
764a5c6b | 655 | return buffer_size - rest; /* total size */ |
ac27a0ec DK |
656 | } |
657 | ||
658 | static int | |
431547b3 | 659 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 660 | { |
2b0143b5 | 661 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
662 | struct buffer_head *bh = NULL; |
663 | int error; | |
664 | ||
665 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
666 | buffer, (long)buffer_size); | |
667 | ||
668 | error = 0; | |
617ba13b | 669 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 670 | goto cleanup; |
ace36ad4 JP |
671 | ea_idebug(inode, "reading block %llu", |
672 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 673 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
674 | error = -EIO; |
675 | if (!bh) | |
676 | goto cleanup; | |
677 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
678 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
cc8e94fd | 679 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
680 | EXT4_ERROR_INODE(inode, "bad block %llu", |
681 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 682 | error = -EFSCORRUPTED; |
ac27a0ec DK |
683 | goto cleanup; |
684 | } | |
47387409 | 685 | ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); |
431547b3 | 686 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); |
ac27a0ec DK |
687 | |
688 | cleanup: | |
689 | brelse(bh); | |
690 | ||
691 | return error; | |
692 | } | |
693 | ||
694 | static int | |
431547b3 | 695 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 696 | { |
2b0143b5 | 697 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
698 | struct ext4_xattr_ibody_header *header; |
699 | struct ext4_inode *raw_inode; | |
700 | struct ext4_iloc iloc; | |
ac27a0ec DK |
701 | void *end; |
702 | int error; | |
703 | ||
19f5fb7a | 704 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 705 | return 0; |
617ba13b | 706 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
707 | if (error) |
708 | return error; | |
617ba13b | 709 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 710 | header = IHDR(inode, raw_inode); |
617ba13b | 711 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 712 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
713 | if (error) |
714 | goto cleanup; | |
431547b3 | 715 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
716 | buffer, buffer_size); |
717 | ||
718 | cleanup: | |
719 | brelse(iloc.bh); | |
720 | return error; | |
721 | } | |
722 | ||
723 | /* | |
ba7ea1d8 EB |
724 | * Inode operation listxattr() |
725 | * | |
726 | * d_inode(dentry)->i_rwsem: don't care | |
ac27a0ec DK |
727 | * |
728 | * Copy a list of attribute names into the buffer | |
729 | * provided, or compute the buffer size required. | |
730 | * Buffer is NULL to compute the size of the buffer required. | |
731 | * | |
732 | * Returns a negative error number on failure, or the number of bytes | |
733 | * used / required on success. | |
734 | */ | |
ba7ea1d8 EB |
735 | ssize_t |
736 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
ac27a0ec | 737 | { |
eaeef867 | 738 | int ret, ret2; |
ac27a0ec | 739 | |
2b0143b5 | 740 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
741 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
742 | if (ret < 0) | |
743 | goto errout; | |
744 | if (buffer) { | |
745 | buffer += ret; | |
746 | buffer_size -= ret; | |
ac27a0ec | 747 | } |
eaeef867 TT |
748 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
749 | if (ret < 0) | |
750 | goto errout; | |
751 | ret += ret2; | |
752 | errout: | |
2b0143b5 | 753 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 754 | return ret; |
ac27a0ec DK |
755 | } |
756 | ||
757 | /* | |
617ba13b | 758 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
759 | * not set, set it. |
760 | */ | |
617ba13b | 761 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
762 | struct super_block *sb) |
763 | { | |
e2b911c5 | 764 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
765 | return; |
766 | ||
5d601255 | 767 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 768 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
e2b911c5 | 769 | ext4_set_feature_xattr(sb); |
a0375156 | 770 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec | 771 | } |
ac27a0ec DK |
772 | } |
773 | ||
7a9ca53a TE |
774 | int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) |
775 | { | |
776 | struct ext4_iloc iloc = { .bh = NULL }; | |
777 | struct buffer_head *bh = NULL; | |
778 | struct ext4_inode *raw_inode; | |
779 | struct ext4_xattr_ibody_header *header; | |
780 | struct ext4_xattr_entry *entry; | |
781 | qsize_t ea_inode_refs = 0; | |
782 | void *end; | |
783 | int ret; | |
784 | ||
785 | lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); | |
786 | ||
787 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
788 | ret = ext4_get_inode_loc(inode, &iloc); | |
789 | if (ret) | |
790 | goto out; | |
791 | raw_inode = ext4_raw_inode(&iloc); | |
792 | header = IHDR(inode, raw_inode); | |
793 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
794 | ret = xattr_check_inode(inode, header, end); | |
795 | if (ret) | |
796 | goto out; | |
797 | ||
798 | for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); | |
799 | entry = EXT4_XATTR_NEXT(entry)) | |
800 | if (entry->e_value_inum) | |
801 | ea_inode_refs++; | |
802 | } | |
803 | ||
804 | if (EXT4_I(inode)->i_file_acl) { | |
805 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
806 | if (!bh) { | |
807 | ret = -EIO; | |
808 | goto out; | |
809 | } | |
810 | ||
811 | if (ext4_xattr_check_block(inode, bh)) { | |
812 | ret = -EFSCORRUPTED; | |
813 | goto out; | |
814 | } | |
815 | ||
816 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
817 | entry = EXT4_XATTR_NEXT(entry)) | |
818 | if (entry->e_value_inum) | |
819 | ea_inode_refs++; | |
820 | } | |
821 | *usage = ea_inode_refs + 1; | |
822 | ret = 0; | |
823 | out: | |
824 | brelse(iloc.bh); | |
825 | brelse(bh); | |
826 | return ret; | |
827 | } | |
828 | ||
dec214d0 TE |
829 | static inline size_t round_up_cluster(struct inode *inode, size_t length) |
830 | { | |
831 | struct super_block *sb = inode->i_sb; | |
832 | size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + | |
833 | inode->i_blkbits); | |
834 | size_t mask = ~(cluster_size - 1); | |
835 | ||
836 | return (length + cluster_size - 1) & mask; | |
837 | } | |
838 | ||
839 | static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) | |
840 | { | |
841 | int err; | |
842 | ||
843 | err = dquot_alloc_inode(inode); | |
844 | if (err) | |
845 | return err; | |
846 | err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); | |
847 | if (err) | |
848 | dquot_free_inode(inode); | |
849 | return err; | |
850 | } | |
851 | ||
a6d05676 TE |
852 | static void ext4_xattr_inode_free_quota(struct inode *parent, |
853 | struct inode *ea_inode, | |
854 | size_t len) | |
dec214d0 | 855 | { |
a6d05676 TE |
856 | if (ea_inode && |
857 | ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) | |
858 | return; | |
859 | dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); | |
860 | dquot_free_inode(parent); | |
dec214d0 TE |
861 | } |
862 | ||
af65207c TE |
863 | int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, |
864 | struct buffer_head *block_bh, size_t value_len, | |
865 | bool is_create) | |
dec214d0 | 866 | { |
dec214d0 TE |
867 | int credits; |
868 | int blocks; | |
869 | ||
870 | /* | |
871 | * 1) Owner inode update | |
872 | * 2) Ref count update on old xattr block | |
873 | * 3) new xattr block | |
874 | * 4) block bitmap update for new xattr block | |
875 | * 5) group descriptor for new xattr block | |
876 | * 6) block bitmap update for old xattr block | |
877 | * 7) group descriptor for old block | |
878 | * | |
879 | * 6 & 7 can happen if we have two racing threads T_a and T_b | |
880 | * which are each trying to set an xattr on inodes I_a and I_b | |
881 | * which were both initially sharing an xattr block. | |
882 | */ | |
883 | credits = 7; | |
884 | ||
885 | /* Quota updates. */ | |
886 | credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); | |
887 | ||
888 | /* | |
889 | * In case of inline data, we may push out the data to a block, | |
890 | * so we need to reserve credits for this eventuality | |
891 | */ | |
af65207c | 892 | if (inode && ext4_has_inline_data(inode)) |
dec214d0 TE |
893 | credits += ext4_writepage_trans_blocks(inode) + 1; |
894 | ||
895 | /* We are done if ea_inode feature is not enabled. */ | |
896 | if (!ext4_has_feature_ea_inode(sb)) | |
897 | return credits; | |
898 | ||
899 | /* New ea_inode, inode map, block bitmap, group descriptor. */ | |
900 | credits += 4; | |
901 | ||
902 | /* Data blocks. */ | |
903 | blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; | |
904 | ||
905 | /* Indirection block or one level of extent tree. */ | |
906 | blocks += 1; | |
907 | ||
908 | /* Block bitmap and group descriptor updates for each block. */ | |
909 | credits += blocks * 2; | |
910 | ||
911 | /* Blocks themselves. */ | |
912 | credits += blocks; | |
913 | ||
af65207c TE |
914 | if (!is_create) { |
915 | /* Dereference ea_inode holding old xattr value. | |
916 | * Old ea_inode, inode map, block bitmap, group descriptor. | |
917 | */ | |
918 | credits += 4; | |
dec214d0 | 919 | |
af65207c TE |
920 | /* Data blocks for old ea_inode. */ |
921 | blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; | |
dec214d0 | 922 | |
af65207c TE |
923 | /* Indirection block or one level of extent tree for old |
924 | * ea_inode. | |
925 | */ | |
926 | blocks += 1; | |
dec214d0 | 927 | |
af65207c TE |
928 | /* Block bitmap and group descriptor updates for each block. */ |
929 | credits += blocks * 2; | |
930 | } | |
dec214d0 TE |
931 | |
932 | /* We may need to clone the existing xattr block in which case we need | |
933 | * to increment ref counts for existing ea_inodes referenced by it. | |
934 | */ | |
935 | if (block_bh) { | |
936 | struct ext4_xattr_entry *entry = BFIRST(block_bh); | |
937 | ||
938 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) | |
939 | if (entry->e_value_inum) | |
940 | /* Ref count update on ea_inode. */ | |
941 | credits += 1; | |
942 | } | |
943 | return credits; | |
944 | } | |
945 | ||
30a7eb97 TE |
946 | static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode, |
947 | int credits, struct buffer_head *bh, | |
948 | bool dirty, bool block_csum) | |
949 | { | |
950 | int error; | |
951 | ||
952 | if (!ext4_handle_valid(handle)) | |
953 | return 0; | |
954 | ||
955 | if (handle->h_buffer_credits >= credits) | |
956 | return 0; | |
957 | ||
958 | error = ext4_journal_extend(handle, credits - handle->h_buffer_credits); | |
959 | if (!error) | |
960 | return 0; | |
961 | if (error < 0) { | |
962 | ext4_warning(inode->i_sb, "Extend journal (error %d)", error); | |
963 | return error; | |
964 | } | |
965 | ||
966 | if (bh && dirty) { | |
967 | if (block_csum) | |
968 | ext4_xattr_block_csum_set(inode, bh); | |
969 | error = ext4_handle_dirty_metadata(handle, NULL, bh); | |
970 | if (error) { | |
971 | ext4_warning(inode->i_sb, "Handle metadata (error %d)", | |
972 | error); | |
973 | return error; | |
974 | } | |
975 | } | |
976 | ||
977 | error = ext4_journal_restart(handle, credits); | |
978 | if (error) { | |
979 | ext4_warning(inode->i_sb, "Restart journal (error %d)", error); | |
980 | return error; | |
981 | } | |
982 | ||
983 | if (bh) { | |
984 | error = ext4_journal_get_write_access(handle, bh); | |
985 | if (error) { | |
986 | ext4_warning(inode->i_sb, | |
987 | "Get write access failed (error %d)", | |
988 | error); | |
989 | return error; | |
990 | } | |
991 | } | |
992 | return 0; | |
993 | } | |
994 | ||
dec214d0 TE |
995 | static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, |
996 | int ref_change) | |
997 | { | |
998 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); | |
999 | struct ext4_iloc iloc; | |
1000 | s64 ref_count; | |
1001 | u32 hash; | |
1002 | int ret; | |
1003 | ||
1004 | inode_lock(ea_inode); | |
1005 | ||
1006 | ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); | |
1007 | if (ret) { | |
1008 | iloc.bh = NULL; | |
1009 | goto out; | |
1010 | } | |
1011 | ||
1012 | ref_count = ext4_xattr_inode_get_ref(ea_inode); | |
1013 | ref_count += ref_change; | |
1014 | ext4_xattr_inode_set_ref(ea_inode, ref_count); | |
1015 | ||
1016 | if (ref_change > 0) { | |
1017 | WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", | |
1018 | ea_inode->i_ino, ref_count); | |
1019 | ||
1020 | if (ref_count == 1) { | |
1021 | WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", | |
1022 | ea_inode->i_ino, ea_inode->i_nlink); | |
1023 | ||
1024 | set_nlink(ea_inode, 1); | |
1025 | ext4_orphan_del(handle, ea_inode); | |
1026 | ||
cdb7ee4c TE |
1027 | if (ea_inode_cache) { |
1028 | hash = ext4_xattr_inode_get_hash(ea_inode); | |
1029 | mb_cache_entry_create(ea_inode_cache, | |
1030 | GFP_NOFS, hash, | |
1031 | ea_inode->i_ino, | |
1032 | true /* reusable */); | |
1033 | } | |
dec214d0 TE |
1034 | } |
1035 | } else { | |
1036 | WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", | |
1037 | ea_inode->i_ino, ref_count); | |
1038 | ||
1039 | if (ref_count == 0) { | |
1040 | WARN_ONCE(ea_inode->i_nlink != 1, | |
1041 | "EA inode %lu i_nlink=%u", | |
1042 | ea_inode->i_ino, ea_inode->i_nlink); | |
1043 | ||
1044 | clear_nlink(ea_inode); | |
1045 | ext4_orphan_add(handle, ea_inode); | |
1046 | ||
cdb7ee4c TE |
1047 | if (ea_inode_cache) { |
1048 | hash = ext4_xattr_inode_get_hash(ea_inode); | |
1049 | mb_cache_entry_delete(ea_inode_cache, hash, | |
1050 | ea_inode->i_ino); | |
1051 | } | |
dec214d0 TE |
1052 | } |
1053 | } | |
1054 | ||
1055 | ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); | |
1056 | iloc.bh = NULL; | |
1057 | if (ret) | |
1058 | ext4_warning_inode(ea_inode, | |
1059 | "ext4_mark_iloc_dirty() failed ret=%d", ret); | |
1060 | out: | |
1061 | brelse(iloc.bh); | |
1062 | inode_unlock(ea_inode); | |
1063 | return ret; | |
1064 | } | |
1065 | ||
1066 | static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) | |
1067 | { | |
1068 | return ext4_xattr_inode_update_ref(handle, ea_inode, 1); | |
1069 | } | |
1070 | ||
1071 | static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) | |
1072 | { | |
1073 | return ext4_xattr_inode_update_ref(handle, ea_inode, -1); | |
1074 | } | |
1075 | ||
1076 | static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, | |
1077 | struct ext4_xattr_entry *first) | |
1078 | { | |
1079 | struct inode *ea_inode; | |
1080 | struct ext4_xattr_entry *entry; | |
1081 | struct ext4_xattr_entry *failed_entry; | |
1082 | unsigned int ea_ino; | |
1083 | int err, saved_err; | |
1084 | ||
1085 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1086 | entry = EXT4_XATTR_NEXT(entry)) { | |
1087 | if (!entry->e_value_inum) | |
1088 | continue; | |
1089 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1090 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1091 | le32_to_cpu(entry->e_hash), | |
1092 | &ea_inode); | |
dec214d0 TE |
1093 | if (err) |
1094 | goto cleanup; | |
1095 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1096 | if (err) { | |
1097 | ext4_warning_inode(ea_inode, "inc ref error %d", err); | |
1098 | iput(ea_inode); | |
1099 | goto cleanup; | |
1100 | } | |
1101 | iput(ea_inode); | |
1102 | } | |
1103 | return 0; | |
1104 | ||
1105 | cleanup: | |
1106 | saved_err = err; | |
1107 | failed_entry = entry; | |
1108 | ||
1109 | for (entry = first; entry != failed_entry; | |
1110 | entry = EXT4_XATTR_NEXT(entry)) { | |
1111 | if (!entry->e_value_inum) | |
1112 | continue; | |
1113 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1114 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1115 | le32_to_cpu(entry->e_hash), | |
1116 | &ea_inode); | |
dec214d0 TE |
1117 | if (err) { |
1118 | ext4_warning(parent->i_sb, | |
1119 | "cleanup ea_ino %u iget error %d", ea_ino, | |
1120 | err); | |
1121 | continue; | |
1122 | } | |
1123 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1124 | if (err) | |
1125 | ext4_warning_inode(ea_inode, "cleanup dec ref error %d", | |
1126 | err); | |
1127 | iput(ea_inode); | |
1128 | } | |
1129 | return saved_err; | |
1130 | } | |
1131 | ||
30a7eb97 | 1132 | static void |
dec214d0 TE |
1133 | ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, |
1134 | struct buffer_head *bh, | |
1135 | struct ext4_xattr_entry *first, bool block_csum, | |
1136 | struct ext4_xattr_inode_array **ea_inode_array, | |
1137 | int extra_credits, bool skip_quota) | |
30a7eb97 TE |
1138 | { |
1139 | struct inode *ea_inode; | |
1140 | struct ext4_xattr_entry *entry; | |
1141 | bool dirty = false; | |
1142 | unsigned int ea_ino; | |
1143 | int err; | |
1144 | int credits; | |
1145 | ||
1146 | /* One credit for dec ref on ea_inode, one for orphan list addition, */ | |
1147 | credits = 2 + extra_credits; | |
1148 | ||
1149 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1150 | entry = EXT4_XATTR_NEXT(entry)) { | |
1151 | if (!entry->e_value_inum) | |
1152 | continue; | |
1153 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1154 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1155 | le32_to_cpu(entry->e_hash), | |
1156 | &ea_inode); | |
30a7eb97 TE |
1157 | if (err) |
1158 | continue; | |
1159 | ||
1160 | err = ext4_expand_inode_array(ea_inode_array, ea_inode); | |
1161 | if (err) { | |
1162 | ext4_warning_inode(ea_inode, | |
1163 | "Expand inode array err=%d", err); | |
1164 | iput(ea_inode); | |
1165 | continue; | |
1166 | } | |
1167 | ||
1168 | err = ext4_xattr_ensure_credits(handle, parent, credits, bh, | |
1169 | dirty, block_csum); | |
1170 | if (err) { | |
1171 | ext4_warning_inode(ea_inode, "Ensure credits err=%d", | |
1172 | err); | |
1173 | continue; | |
1174 | } | |
1175 | ||
dec214d0 TE |
1176 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); |
1177 | if (err) { | |
1178 | ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", | |
1179 | err); | |
1180 | continue; | |
1181 | } | |
1182 | ||
1183 | if (!skip_quota) | |
a6d05676 | 1184 | ext4_xattr_inode_free_quota(parent, ea_inode, |
dec214d0 | 1185 | le32_to_cpu(entry->e_value_size)); |
30a7eb97 TE |
1186 | |
1187 | /* | |
1188 | * Forget about ea_inode within the same transaction that | |
1189 | * decrements the ref count. This avoids duplicate decrements in | |
1190 | * case the rest of the work spills over to subsequent | |
1191 | * transactions. | |
1192 | */ | |
1193 | entry->e_value_inum = 0; | |
1194 | entry->e_value_size = 0; | |
1195 | ||
1196 | dirty = true; | |
1197 | } | |
1198 | ||
1199 | if (dirty) { | |
1200 | /* | |
1201 | * Note that we are deliberately skipping csum calculation for | |
1202 | * the final update because we do not expect any journal | |
1203 | * restarts until xattr block is freed. | |
1204 | */ | |
1205 | ||
1206 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
1207 | if (err) | |
1208 | ext4_warning_inode(parent, | |
1209 | "handle dirty metadata err=%d", err); | |
1210 | } | |
1211 | } | |
1212 | ||
ac27a0ec | 1213 | /* |
ec4cb1aa JK |
1214 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
1215 | * otherwise free the block. | |
ac27a0ec DK |
1216 | */ |
1217 | static void | |
617ba13b | 1218 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
dec214d0 TE |
1219 | struct buffer_head *bh, |
1220 | struct ext4_xattr_inode_array **ea_inode_array, | |
1221 | int extra_credits) | |
ac27a0ec | 1222 | { |
47387409 | 1223 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
6048c64b | 1224 | u32 hash, ref; |
8a2bfdcb | 1225 | int error = 0; |
ac27a0ec | 1226 | |
5d601255 | 1227 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
1228 | error = ext4_journal_get_write_access(handle, bh); |
1229 | if (error) | |
1230 | goto out; | |
1231 | ||
1232 | lock_buffer(bh); | |
6048c64b AG |
1233 | hash = le32_to_cpu(BHDR(bh)->h_hash); |
1234 | ref = le32_to_cpu(BHDR(bh)->h_refcount); | |
1235 | if (ref == 1) { | |
ac27a0ec | 1236 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
1237 | /* |
1238 | * This must happen under buffer lock for | |
1239 | * ext4_xattr_block_set() to reliably detect freed block | |
1240 | */ | |
cdb7ee4c TE |
1241 | if (ea_block_cache) |
1242 | mb_cache_entry_delete(ea_block_cache, hash, | |
1243 | bh->b_blocknr); | |
ac27a0ec | 1244 | get_bh(bh); |
ec4cb1aa | 1245 | unlock_buffer(bh); |
dec214d0 TE |
1246 | |
1247 | if (ext4_has_feature_ea_inode(inode->i_sb)) | |
1248 | ext4_xattr_inode_dec_ref_all(handle, inode, bh, | |
1249 | BFIRST(bh), | |
1250 | true /* block_csum */, | |
1251 | ea_inode_array, | |
1252 | extra_credits, | |
1253 | true /* skip_quota */); | |
e6362609 TT |
1254 | ext4_free_blocks(handle, inode, bh, 0, 1, |
1255 | EXT4_FREE_BLOCKS_METADATA | | |
1256 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 1257 | } else { |
6048c64b AG |
1258 | ref--; |
1259 | BHDR(bh)->h_refcount = cpu_to_le32(ref); | |
1260 | if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { | |
1261 | struct mb_cache_entry *ce; | |
1262 | ||
cdb7ee4c TE |
1263 | if (ea_block_cache) { |
1264 | ce = mb_cache_entry_get(ea_block_cache, hash, | |
1265 | bh->b_blocknr); | |
1266 | if (ce) { | |
1267 | ce->e_reusable = 1; | |
1268 | mb_cache_entry_put(ea_block_cache, ce); | |
1269 | } | |
6048c64b AG |
1270 | } |
1271 | } | |
1272 | ||
dac7a4b4 | 1273 | ext4_xattr_block_csum_set(inode, bh); |
ec4cb1aa JK |
1274 | /* |
1275 | * Beware of this ugliness: Releasing of xattr block references | |
1276 | * from different inodes can race and so we have to protect | |
1277 | * from a race where someone else frees the block (and releases | |
1278 | * its journal_head) before we are done dirtying the buffer. In | |
1279 | * nojournal mode this race is harmless and we actually cannot | |
dac7a4b4 | 1280 | * call ext4_handle_dirty_metadata() with locked buffer as |
ec4cb1aa JK |
1281 | * that function can call sync_dirty_buffer() so for that case |
1282 | * we handle the dirtying after unlocking the buffer. | |
1283 | */ | |
1284 | if (ext4_handle_valid(handle)) | |
dac7a4b4 | 1285 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
c1bb05a6 | 1286 | unlock_buffer(bh); |
ec4cb1aa | 1287 | if (!ext4_handle_valid(handle)) |
dac7a4b4 | 1288 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
8a2bfdcb | 1289 | if (IS_SYNC(inode)) |
0390131b | 1290 | ext4_handle_sync(handle); |
1231b3a1 | 1291 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
1292 | ea_bdebug(bh, "refcount now=%d; releasing", |
1293 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 1294 | } |
8a2bfdcb MC |
1295 | out: |
1296 | ext4_std_error(inode->i_sb, error); | |
1297 | return; | |
ac27a0ec DK |
1298 | } |
1299 | ||
6dd4ee7c KS |
1300 | /* |
1301 | * Find the available free space for EAs. This also returns the total number of | |
1302 | * bytes used by EA entries. | |
1303 | */ | |
1304 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
1305 | size_t *min_offs, void *base, int *total) | |
1306 | { | |
1307 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 1308 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
1309 | size_t offs = le16_to_cpu(last->e_value_offs); |
1310 | if (offs < *min_offs) | |
1311 | *min_offs = offs; | |
1312 | } | |
7b1b2c1b TT |
1313 | if (total) |
1314 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
1315 | } |
1316 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
1317 | } | |
1318 | ||
e50e5129 AD |
1319 | /* |
1320 | * Write the value of the EA in an inode. | |
1321 | */ | |
1322 | static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, | |
1323 | const void *buf, int bufsize) | |
1324 | { | |
1325 | struct buffer_head *bh = NULL; | |
1326 | unsigned long block = 0; | |
dec214d0 TE |
1327 | int blocksize = ea_inode->i_sb->s_blocksize; |
1328 | int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; | |
e50e5129 AD |
1329 | int csize, wsize = 0; |
1330 | int ret = 0; | |
1331 | int retries = 0; | |
1332 | ||
1333 | retry: | |
1334 | while (ret >= 0 && ret < max_blocks) { | |
1335 | struct ext4_map_blocks map; | |
1336 | map.m_lblk = block += ret; | |
1337 | map.m_len = max_blocks -= ret; | |
1338 | ||
1339 | ret = ext4_map_blocks(handle, ea_inode, &map, | |
1340 | EXT4_GET_BLOCKS_CREATE); | |
1341 | if (ret <= 0) { | |
1342 | ext4_mark_inode_dirty(handle, ea_inode); | |
1343 | if (ret == -ENOSPC && | |
1344 | ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { | |
1345 | ret = 0; | |
1346 | goto retry; | |
1347 | } | |
1348 | break; | |
1349 | } | |
1350 | } | |
1351 | ||
1352 | if (ret < 0) | |
1353 | return ret; | |
1354 | ||
1355 | block = 0; | |
1356 | while (wsize < bufsize) { | |
1357 | if (bh != NULL) | |
1358 | brelse(bh); | |
1359 | csize = (bufsize - wsize) > blocksize ? blocksize : | |
1360 | bufsize - wsize; | |
1361 | bh = ext4_getblk(handle, ea_inode, block, 0); | |
1362 | if (IS_ERR(bh)) | |
1363 | return PTR_ERR(bh); | |
1364 | ret = ext4_journal_get_write_access(handle, bh); | |
1365 | if (ret) | |
1366 | goto out; | |
1367 | ||
1368 | memcpy(bh->b_data, buf, csize); | |
1369 | set_buffer_uptodate(bh); | |
1370 | ext4_handle_dirty_metadata(handle, ea_inode, bh); | |
1371 | ||
1372 | buf += csize; | |
1373 | wsize += csize; | |
1374 | block += 1; | |
1375 | } | |
1376 | ||
1377 | inode_lock(ea_inode); | |
1378 | i_size_write(ea_inode, wsize); | |
1379 | ext4_update_i_disksize(ea_inode, wsize); | |
1380 | inode_unlock(ea_inode); | |
1381 | ||
1382 | ext4_mark_inode_dirty(handle, ea_inode); | |
1383 | ||
1384 | out: | |
1385 | brelse(bh); | |
1386 | ||
1387 | return ret; | |
1388 | } | |
1389 | ||
1390 | /* | |
1391 | * Create an inode to store the value of a large EA. | |
1392 | */ | |
1393 | static struct inode *ext4_xattr_inode_create(handle_t *handle, | |
dec214d0 | 1394 | struct inode *inode, u32 hash) |
e50e5129 AD |
1395 | { |
1396 | struct inode *ea_inode = NULL; | |
9e1ba001 | 1397 | uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; |
bd3b963b | 1398 | int err; |
e50e5129 AD |
1399 | |
1400 | /* | |
1401 | * Let the next inode be the goal, so we try and allocate the EA inode | |
1402 | * in the same group, or nearby one. | |
1403 | */ | |
1404 | ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, | |
9e1ba001 | 1405 | S_IFREG | 0600, NULL, inode->i_ino + 1, owner, |
1b917ed8 | 1406 | EXT4_EA_INODE_FL); |
e50e5129 AD |
1407 | if (!IS_ERR(ea_inode)) { |
1408 | ea_inode->i_op = &ext4_file_inode_operations; | |
1409 | ea_inode->i_fop = &ext4_file_operations; | |
1410 | ext4_set_aops(ea_inode); | |
33d201e0 | 1411 | ext4_xattr_inode_set_class(ea_inode); |
e50e5129 | 1412 | unlock_new_inode(ea_inode); |
dec214d0 TE |
1413 | ext4_xattr_inode_set_ref(ea_inode, 1); |
1414 | ext4_xattr_inode_set_hash(ea_inode, hash); | |
1415 | err = ext4_mark_inode_dirty(handle, ea_inode); | |
1416 | if (!err) | |
1417 | err = ext4_inode_attach_jinode(ea_inode); | |
bd3b963b TE |
1418 | if (err) { |
1419 | iput(ea_inode); | |
1420 | return ERR_PTR(err); | |
1421 | } | |
dec214d0 TE |
1422 | |
1423 | /* | |
1424 | * Xattr inodes are shared therefore quota charging is performed | |
1425 | * at a higher level. | |
1426 | */ | |
1427 | dquot_free_inode(ea_inode); | |
1428 | dquot_drop(ea_inode); | |
1429 | inode_lock(ea_inode); | |
1430 | ea_inode->i_flags |= S_NOQUOTA; | |
1431 | inode_unlock(ea_inode); | |
e50e5129 AD |
1432 | } |
1433 | ||
1434 | return ea_inode; | |
1435 | } | |
1436 | ||
dec214d0 TE |
1437 | static struct inode * |
1438 | ext4_xattr_inode_cache_find(struct inode *inode, const void *value, | |
1439 | size_t value_len, u32 hash) | |
e50e5129 | 1440 | { |
dec214d0 TE |
1441 | struct inode *ea_inode; |
1442 | struct mb_cache_entry *ce; | |
1443 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); | |
1444 | void *ea_data; | |
1445 | ||
cdb7ee4c TE |
1446 | if (!ea_inode_cache) |
1447 | return NULL; | |
1448 | ||
dec214d0 TE |
1449 | ce = mb_cache_entry_find_first(ea_inode_cache, hash); |
1450 | if (!ce) | |
1451 | return NULL; | |
1452 | ||
1453 | ea_data = ext4_kvmalloc(value_len, GFP_NOFS); | |
1454 | if (!ea_data) { | |
1455 | mb_cache_entry_put(ea_inode_cache, ce); | |
1456 | return NULL; | |
1457 | } | |
e50e5129 | 1458 | |
dec214d0 TE |
1459 | while (ce) { |
1460 | ea_inode = ext4_iget(inode->i_sb, ce->e_value); | |
1461 | if (!IS_ERR(ea_inode) && | |
1462 | !is_bad_inode(ea_inode) && | |
1463 | (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && | |
1464 | i_size_read(ea_inode) == value_len && | |
1465 | !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && | |
b9fc761e TE |
1466 | !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, |
1467 | value_len) && | |
dec214d0 TE |
1468 | !memcmp(value, ea_data, value_len)) { |
1469 | mb_cache_entry_touch(ea_inode_cache, ce); | |
1470 | mb_cache_entry_put(ea_inode_cache, ce); | |
1471 | kvfree(ea_data); | |
1472 | return ea_inode; | |
1473 | } | |
e50e5129 | 1474 | |
dec214d0 TE |
1475 | if (!IS_ERR(ea_inode)) |
1476 | iput(ea_inode); | |
1477 | ce = mb_cache_entry_find_next(ea_inode_cache, ce); | |
1478 | } | |
1479 | kvfree(ea_data); | |
1480 | return NULL; | |
e50e5129 AD |
1481 | } |
1482 | ||
1483 | /* | |
1484 | * Add value of the EA in an inode. | |
1485 | */ | |
dec214d0 TE |
1486 | static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, |
1487 | const void *value, size_t value_len, | |
1488 | struct inode **ret_inode) | |
e50e5129 AD |
1489 | { |
1490 | struct inode *ea_inode; | |
dec214d0 | 1491 | u32 hash; |
e50e5129 AD |
1492 | int err; |
1493 | ||
dec214d0 TE |
1494 | hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); |
1495 | ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); | |
1496 | if (ea_inode) { | |
1497 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1498 | if (err) { | |
1499 | iput(ea_inode); | |
1500 | return err; | |
1501 | } | |
1502 | ||
1503 | *ret_inode = ea_inode; | |
1504 | return 0; | |
1505 | } | |
1506 | ||
e50e5129 | 1507 | /* Create an inode for the EA value */ |
dec214d0 | 1508 | ea_inode = ext4_xattr_inode_create(handle, inode, hash); |
e50e5129 AD |
1509 | if (IS_ERR(ea_inode)) |
1510 | return PTR_ERR(ea_inode); | |
1511 | ||
1512 | err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); | |
dec214d0 TE |
1513 | if (err) { |
1514 | ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1515 | iput(ea_inode); | |
1516 | return err; | |
1517 | } | |
e50e5129 | 1518 | |
cdb7ee4c TE |
1519 | if (EA_INODE_CACHE(inode)) |
1520 | mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, | |
1521 | ea_inode->i_ino, true /* reusable */); | |
e50e5129 | 1522 | |
dec214d0 TE |
1523 | *ret_inode = ea_inode; |
1524 | return 0; | |
e50e5129 AD |
1525 | } |
1526 | ||
9c6e7853 TE |
1527 | /* |
1528 | * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode | |
1529 | * feature is enabled. | |
1530 | */ | |
1531 | #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) | |
1532 | ||
e50e5129 AD |
1533 | static int ext4_xattr_set_entry(struct ext4_xattr_info *i, |
1534 | struct ext4_xattr_search *s, | |
daf83281 TE |
1535 | handle_t *handle, struct inode *inode, |
1536 | bool is_block) | |
ac27a0ec | 1537 | { |
617ba13b | 1538 | struct ext4_xattr_entry *last; |
dec214d0 TE |
1539 | struct ext4_xattr_entry *here = s->here; |
1540 | size_t min_offs = s->end - s->base, name_len = strlen(i->name); | |
e50e5129 | 1541 | int in_inode = i->in_inode; |
dec214d0 TE |
1542 | struct inode *old_ea_inode = NULL; |
1543 | struct inode *new_ea_inode = NULL; | |
1544 | size_t old_size, new_size; | |
1545 | int ret; | |
1546 | ||
1547 | /* Space used by old and new values. */ | |
1548 | old_size = (!s->not_found && !here->e_value_inum) ? | |
1549 | EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; | |
1550 | new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; | |
1551 | ||
1552 | /* | |
1553 | * Optimization for the simple case when old and new values have the | |
1554 | * same padded sizes. Not applicable if external inodes are involved. | |
1555 | */ | |
1556 | if (new_size && new_size == old_size) { | |
1557 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1558 | void *val = s->base + offs; | |
1559 | ||
1560 | here->e_value_size = cpu_to_le32(i->value_len); | |
1561 | if (i->value == EXT4_ZERO_XATTR_VALUE) { | |
1562 | memset(val, 0, new_size); | |
1563 | } else { | |
1564 | memcpy(val, i->value, i->value_len); | |
1565 | /* Clear padding bytes. */ | |
1566 | memset(val + i->value_len, 0, new_size - i->value_len); | |
1567 | } | |
32aaf194 | 1568 | goto update_hash; |
dec214d0 | 1569 | } |
e50e5129 | 1570 | |
ac27a0ec DK |
1571 | /* Compute min_offs and last. */ |
1572 | last = s->first; | |
617ba13b | 1573 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
e50e5129 | 1574 | if (!last->e_value_inum && last->e_value_size) { |
ac27a0ec DK |
1575 | size_t offs = le16_to_cpu(last->e_value_offs); |
1576 | if (offs < min_offs) | |
1577 | min_offs = offs; | |
1578 | } | |
1579 | } | |
dec214d0 TE |
1580 | |
1581 | /* Check whether we have enough space. */ | |
ac27a0ec | 1582 | if (i->value) { |
dec214d0 | 1583 | size_t free; |
e50e5129 | 1584 | |
dec214d0 TE |
1585 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); |
1586 | if (!s->not_found) | |
1587 | free += EXT4_XATTR_LEN(name_len) + old_size; | |
e50e5129 | 1588 | |
dec214d0 TE |
1589 | if (free < EXT4_XATTR_LEN(name_len) + new_size) { |
1590 | ret = -ENOSPC; | |
1591 | goto out; | |
1592 | } | |
9c6e7853 TE |
1593 | |
1594 | /* | |
1595 | * If storing the value in an external inode is an option, | |
1596 | * reserve space for xattr entries/names in the external | |
1597 | * attribute block so that a long value does not occupy the | |
1598 | * whole space and prevent futher entries being added. | |
1599 | */ | |
daf83281 TE |
1600 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
1601 | new_size && is_block && | |
9c6e7853 TE |
1602 | (min_offs + old_size - new_size) < |
1603 | EXT4_XATTR_BLOCK_RESERVE(inode)) { | |
1604 | ret = -ENOSPC; | |
1605 | goto out; | |
1606 | } | |
ac27a0ec DK |
1607 | } |
1608 | ||
dec214d0 TE |
1609 | /* |
1610 | * Getting access to old and new ea inodes is subject to failures. | |
1611 | * Finish that work before doing any modifications to the xattr data. | |
1612 | */ | |
1613 | if (!s->not_found && here->e_value_inum) { | |
1614 | ret = ext4_xattr_inode_iget(inode, | |
1615 | le32_to_cpu(here->e_value_inum), | |
a6d05676 | 1616 | le32_to_cpu(here->e_hash), |
dec214d0 TE |
1617 | &old_ea_inode); |
1618 | if (ret) { | |
1619 | old_ea_inode = NULL; | |
1620 | goto out; | |
1621 | } | |
1622 | } | |
1623 | if (i->value && in_inode) { | |
1624 | WARN_ON_ONCE(!i->value_len); | |
ac27a0ec | 1625 | |
dec214d0 TE |
1626 | ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); |
1627 | if (ret) | |
1628 | goto out; | |
1629 | ||
1630 | ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, | |
1631 | i->value_len, | |
1632 | &new_ea_inode); | |
1633 | if (ret) { | |
1634 | new_ea_inode = NULL; | |
a6d05676 | 1635 | ext4_xattr_inode_free_quota(inode, NULL, i->value_len); |
dec214d0 | 1636 | goto out; |
ac27a0ec | 1637 | } |
dec214d0 TE |
1638 | } |
1639 | ||
1640 | if (old_ea_inode) { | |
1641 | /* We are ready to release ref count on the old_ea_inode. */ | |
1642 | ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); | |
1643 | if (ret) { | |
1644 | /* Release newly required ref count on new_ea_inode. */ | |
1645 | if (new_ea_inode) { | |
1646 | int err; | |
1647 | ||
1648 | err = ext4_xattr_inode_dec_ref(handle, | |
1649 | new_ea_inode); | |
1650 | if (err) | |
1651 | ext4_warning_inode(new_ea_inode, | |
1652 | "dec ref new_ea_inode err=%d", | |
1653 | err); | |
a6d05676 | 1654 | ext4_xattr_inode_free_quota(inode, new_ea_inode, |
dec214d0 TE |
1655 | i->value_len); |
1656 | } | |
1657 | goto out; | |
e50e5129 | 1658 | } |
dec214d0 | 1659 | |
a6d05676 | 1660 | ext4_xattr_inode_free_quota(inode, old_ea_inode, |
dec214d0 TE |
1661 | le32_to_cpu(here->e_value_size)); |
1662 | } | |
1663 | ||
1664 | /* No failures allowed past this point. */ | |
1665 | ||
1666 | if (!s->not_found && here->e_value_offs) { | |
1667 | /* Remove the old value. */ | |
1668 | void *first_val = s->base + min_offs; | |
1669 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1670 | void *val = s->base + offs; | |
1671 | ||
1672 | memmove(first_val + old_size, first_val, val - first_val); | |
1673 | memset(first_val, 0, old_size); | |
1674 | min_offs += old_size; | |
1675 | ||
1676 | /* Adjust all value offsets. */ | |
1677 | last = s->first; | |
1678 | while (!IS_LAST_ENTRY(last)) { | |
1679 | size_t o = le16_to_cpu(last->e_value_offs); | |
1680 | ||
1681 | if (!last->e_value_inum && | |
1682 | last->e_value_size && o < offs) | |
1683 | last->e_value_offs = cpu_to_le16(o + old_size); | |
1684 | last = EXT4_XATTR_NEXT(last); | |
ac27a0ec DK |
1685 | } |
1686 | } | |
1687 | ||
dec214d0 TE |
1688 | if (!i->value) { |
1689 | /* Remove old name. */ | |
1690 | size_t size = EXT4_XATTR_LEN(name_len); | |
1691 | ||
1692 | last = ENTRY((void *)last - size); | |
1693 | memmove(here, (void *)here + size, | |
1694 | (void *)last - (void *)here + sizeof(__u32)); | |
1695 | memset(last, 0, size); | |
1696 | } else if (s->not_found) { | |
1697 | /* Insert new name. */ | |
1698 | size_t size = EXT4_XATTR_LEN(name_len); | |
1699 | size_t rest = (void *)last - (void *)here + sizeof(__u32); | |
1700 | ||
1701 | memmove((void *)here + size, here, rest); | |
1702 | memset(here, 0, size); | |
1703 | here->e_name_index = i->name_index; | |
1704 | here->e_name_len = name_len; | |
1705 | memcpy(here->e_name, i->name, name_len); | |
1706 | } else { | |
1707 | /* This is an update, reset value info. */ | |
1708 | here->e_value_inum = 0; | |
1709 | here->e_value_offs = 0; | |
1710 | here->e_value_size = 0; | |
1711 | } | |
1712 | ||
ac27a0ec | 1713 | if (i->value) { |
dec214d0 | 1714 | /* Insert new value. */ |
e50e5129 | 1715 | if (in_inode) { |
dec214d0 | 1716 | here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); |
e50e5129 | 1717 | } else if (i->value_len) { |
dec214d0 TE |
1718 | void *val = s->base + min_offs - new_size; |
1719 | ||
1720 | here->e_value_offs = cpu_to_le16(min_offs - new_size); | |
bd9926e8 | 1721 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
dec214d0 | 1722 | memset(val, 0, new_size); |
bd9926e8 | 1723 | } else { |
bd9926e8 | 1724 | memcpy(val, i->value, i->value_len); |
dec214d0 TE |
1725 | /* Clear padding bytes. */ |
1726 | memset(val + i->value_len, 0, | |
1727 | new_size - i->value_len); | |
bd9926e8 | 1728 | } |
ac27a0ec | 1729 | } |
dec214d0 | 1730 | here->e_value_size = cpu_to_le32(i->value_len); |
ac27a0ec | 1731 | } |
daf83281 | 1732 | |
32aaf194 | 1733 | update_hash: |
b9fc761e TE |
1734 | if (i->value) { |
1735 | __le32 hash = 0; | |
1736 | ||
1737 | /* Entry hash calculation. */ | |
1738 | if (in_inode) { | |
1739 | __le32 crc32c_hash; | |
1740 | ||
1741 | /* | |
1742 | * Feed crc32c hash instead of the raw value for entry | |
1743 | * hash calculation. This is to avoid walking | |
1744 | * potentially long value buffer again. | |
1745 | */ | |
1746 | crc32c_hash = cpu_to_le32( | |
1747 | ext4_xattr_inode_get_hash(new_ea_inode)); | |
1748 | hash = ext4_xattr_hash_entry(here->e_name, | |
1749 | here->e_name_len, | |
1750 | &crc32c_hash, 1); | |
1751 | } else if (is_block) { | |
32aaf194 TE |
1752 | __le32 *value = s->base + le16_to_cpu( |
1753 | here->e_value_offs); | |
b9fc761e TE |
1754 | |
1755 | hash = ext4_xattr_hash_entry(here->e_name, | |
1756 | here->e_name_len, value, | |
1757 | new_size >> 2); | |
1758 | } | |
1759 | here->e_hash = hash; | |
daf83281 TE |
1760 | } |
1761 | ||
b9fc761e TE |
1762 | if (is_block) |
1763 | ext4_xattr_rehash((struct ext4_xattr_header *)s->base); | |
1764 | ||
dec214d0 | 1765 | ret = 0; |
e50e5129 | 1766 | out: |
dec214d0 TE |
1767 | iput(old_ea_inode); |
1768 | iput(new_ea_inode); | |
1769 | return ret; | |
ac27a0ec DK |
1770 | } |
1771 | ||
617ba13b MC |
1772 | struct ext4_xattr_block_find { |
1773 | struct ext4_xattr_search s; | |
ac27a0ec DK |
1774 | struct buffer_head *bh; |
1775 | }; | |
1776 | ||
1777 | static int | |
617ba13b MC |
1778 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
1779 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1780 | { |
1781 | struct super_block *sb = inode->i_sb; | |
1782 | int error; | |
1783 | ||
1784 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
1785 | i->name_index, i->name, i->value, (long)i->value_len); | |
1786 | ||
617ba13b | 1787 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 1788 | /* The inode already has an extended attribute block. */ |
617ba13b | 1789 | bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
1790 | error = -EIO; |
1791 | if (!bs->bh) | |
1792 | goto cleanup; | |
1793 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", | |
1794 | atomic_read(&(bs->bh->b_count)), | |
1795 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
cc8e94fd | 1796 | if (ext4_xattr_check_block(inode, bs->bh)) { |
24676da4 TT |
1797 | EXT4_ERROR_INODE(inode, "bad block %llu", |
1798 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 1799 | error = -EFSCORRUPTED; |
ac27a0ec DK |
1800 | goto cleanup; |
1801 | } | |
1802 | /* Find the named attribute. */ | |
1803 | bs->s.base = BHDR(bs->bh); | |
1804 | bs->s.first = BFIRST(bs->bh); | |
1805 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
1806 | bs->s.here = bs->s.first; | |
617ba13b | 1807 | error = ext4_xattr_find_entry(&bs->s.here, i->name_index, |
6ba644b9 | 1808 | i->name, 1); |
ac27a0ec DK |
1809 | if (error && error != -ENODATA) |
1810 | goto cleanup; | |
1811 | bs->s.not_found = error; | |
1812 | } | |
1813 | error = 0; | |
1814 | ||
1815 | cleanup: | |
1816 | return error; | |
1817 | } | |
1818 | ||
1819 | static int | |
617ba13b MC |
1820 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
1821 | struct ext4_xattr_info *i, | |
1822 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1823 | { |
1824 | struct super_block *sb = inode->i_sb; | |
1825 | struct buffer_head *new_bh = NULL; | |
b347e2bc TE |
1826 | struct ext4_xattr_search s_copy = bs->s; |
1827 | struct ext4_xattr_search *s = &s_copy; | |
7a2508e1 | 1828 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 1829 | int error = 0; |
47387409 | 1830 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
a6d05676 TE |
1831 | struct inode *ea_inode = NULL, *tmp_inode; |
1832 | size_t old_ea_inode_quota = 0; | |
1833 | unsigned int ea_ino; | |
1834 | ||
ac27a0ec | 1835 | |
617ba13b | 1836 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec | 1837 | |
ac27a0ec | 1838 | if (s->base) { |
5d601255 | 1839 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
1840 | error = ext4_journal_get_write_access(handle, bs->bh); |
1841 | if (error) | |
1842 | goto cleanup; | |
1843 | lock_buffer(bs->bh); | |
1844 | ||
ac27a0ec | 1845 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
1846 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
1847 | ||
1848 | /* | |
1849 | * This must happen under buffer lock for | |
1850 | * ext4_xattr_block_set() to reliably detect modified | |
1851 | * block | |
1852 | */ | |
cdb7ee4c TE |
1853 | if (ea_block_cache) |
1854 | mb_cache_entry_delete(ea_block_cache, hash, | |
1855 | bs->bh->b_blocknr); | |
ac27a0ec | 1856 | ea_bdebug(bs->bh, "modifying in-place"); |
daf83281 TE |
1857 | error = ext4_xattr_set_entry(i, s, handle, inode, |
1858 | true /* is_block */); | |
dac7a4b4 | 1859 | ext4_xattr_block_csum_set(inode, bs->bh); |
ac27a0ec | 1860 | unlock_buffer(bs->bh); |
6a797d27 | 1861 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1862 | goto bad_block; |
1863 | if (!error) | |
dac7a4b4 TT |
1864 | error = ext4_handle_dirty_metadata(handle, |
1865 | inode, | |
1866 | bs->bh); | |
ac27a0ec DK |
1867 | if (error) |
1868 | goto cleanup; | |
1869 | goto inserted; | |
1870 | } else { | |
1871 | int offset = (char *)s->here - bs->bh->b_data; | |
1872 | ||
8a2bfdcb | 1873 | unlock_buffer(bs->bh); |
ac27a0ec | 1874 | ea_bdebug(bs->bh, "cloning"); |
216553c4 | 1875 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
1876 | error = -ENOMEM; |
1877 | if (s->base == NULL) | |
1878 | goto cleanup; | |
1879 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
1880 | s->first = ENTRY(header(s->base)+1); | |
1881 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1882 | s->here = ENTRY(s->base + offset); | |
1883 | s->end = s->base + bs->bh->b_size; | |
dec214d0 TE |
1884 | |
1885 | /* | |
1886 | * If existing entry points to an xattr inode, we need | |
1887 | * to prevent ext4_xattr_set_entry() from decrementing | |
1888 | * ref count on it because the reference belongs to the | |
1889 | * original block. In this case, make the entry look | |
1890 | * like it has an empty value. | |
1891 | */ | |
1892 | if (!s->not_found && s->here->e_value_inum) { | |
a6d05676 TE |
1893 | ea_ino = le32_to_cpu(s->here->e_value_inum); |
1894 | error = ext4_xattr_inode_iget(inode, ea_ino, | |
1895 | le32_to_cpu(s->here->e_hash), | |
1896 | &tmp_inode); | |
1897 | if (error) | |
1898 | goto cleanup; | |
1899 | ||
1900 | if (!ext4_test_inode_state(tmp_inode, | |
1901 | EXT4_STATE_LUSTRE_EA_INODE)) { | |
1902 | /* | |
1903 | * Defer quota free call for previous | |
1904 | * inode until success is guaranteed. | |
1905 | */ | |
1906 | old_ea_inode_quota = le32_to_cpu( | |
dec214d0 | 1907 | s->here->e_value_size); |
a6d05676 TE |
1908 | } |
1909 | iput(tmp_inode); | |
1910 | ||
dec214d0 TE |
1911 | s->here->e_value_inum = 0; |
1912 | s->here->e_value_size = 0; | |
1913 | } | |
ac27a0ec DK |
1914 | } |
1915 | } else { | |
1916 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 1917 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
1918 | /* assert(header == s->base) */ |
1919 | error = -ENOMEM; | |
1920 | if (s->base == NULL) | |
1921 | goto cleanup; | |
617ba13b | 1922 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
1923 | header(s->base)->h_blocks = cpu_to_le32(1); |
1924 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1925 | s->first = ENTRY(header(s->base)+1); | |
1926 | s->here = ENTRY(header(s->base)+1); | |
1927 | s->end = s->base + sb->s_blocksize; | |
1928 | } | |
1929 | ||
daf83281 | 1930 | error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); |
6a797d27 | 1931 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1932 | goto bad_block; |
1933 | if (error) | |
1934 | goto cleanup; | |
dec214d0 TE |
1935 | |
1936 | if (i->value && s->here->e_value_inum) { | |
dec214d0 TE |
1937 | /* |
1938 | * A ref count on ea_inode has been taken as part of the call to | |
1939 | * ext4_xattr_set_entry() above. We would like to drop this | |
1940 | * extra ref but we have to wait until the xattr block is | |
1941 | * initialized and has its own ref count on the ea_inode. | |
1942 | */ | |
1943 | ea_ino = le32_to_cpu(s->here->e_value_inum); | |
a6d05676 TE |
1944 | error = ext4_xattr_inode_iget(inode, ea_ino, |
1945 | le32_to_cpu(s->here->e_hash), | |
1946 | &ea_inode); | |
dec214d0 TE |
1947 | if (error) { |
1948 | ea_inode = NULL; | |
1949 | goto cleanup; | |
1950 | } | |
1951 | } | |
1952 | ||
ac27a0ec DK |
1953 | inserted: |
1954 | if (!IS_LAST_ENTRY(s->first)) { | |
47387409 TE |
1955 | new_bh = ext4_xattr_block_cache_find(inode, header(s->base), |
1956 | &ce); | |
ac27a0ec DK |
1957 | if (new_bh) { |
1958 | /* We found an identical block in the cache. */ | |
1959 | if (new_bh == bs->bh) | |
1960 | ea_bdebug(new_bh, "keeping"); | |
1961 | else { | |
6048c64b AG |
1962 | u32 ref; |
1963 | ||
b8cb5a54 TE |
1964 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
1965 | ||
ac27a0ec DK |
1966 | /* The old block is released after updating |
1967 | the inode. */ | |
1231b3a1 LC |
1968 | error = dquot_alloc_block(inode, |
1969 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 1970 | if (error) |
ac27a0ec | 1971 | goto cleanup; |
5d601255 | 1972 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 1973 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
1974 | new_bh); |
1975 | if (error) | |
1976 | goto cleanup_dquot; | |
1977 | lock_buffer(new_bh); | |
82939d79 JK |
1978 | /* |
1979 | * We have to be careful about races with | |
6048c64b AG |
1980 | * freeing, rehashing or adding references to |
1981 | * xattr block. Once we hold buffer lock xattr | |
1982 | * block's state is stable so we can check | |
1983 | * whether the block got freed / rehashed or | |
1984 | * not. Since we unhash mbcache entry under | |
1985 | * buffer lock when freeing / rehashing xattr | |
1986 | * block, checking whether entry is still | |
1987 | * hashed is reliable. Same rules hold for | |
1988 | * e_reusable handling. | |
82939d79 | 1989 | */ |
6048c64b AG |
1990 | if (hlist_bl_unhashed(&ce->e_hash_list) || |
1991 | !ce->e_reusable) { | |
82939d79 JK |
1992 | /* |
1993 | * Undo everything and check mbcache | |
1994 | * again. | |
1995 | */ | |
1996 | unlock_buffer(new_bh); | |
1997 | dquot_free_block(inode, | |
1998 | EXT4_C2B(EXT4_SB(sb), | |
1999 | 1)); | |
2000 | brelse(new_bh); | |
47387409 | 2001 | mb_cache_entry_put(ea_block_cache, ce); |
82939d79 JK |
2002 | ce = NULL; |
2003 | new_bh = NULL; | |
2004 | goto inserted; | |
2005 | } | |
6048c64b AG |
2006 | ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
2007 | BHDR(new_bh)->h_refcount = cpu_to_le32(ref); | |
2008 | if (ref >= EXT4_XATTR_REFCOUNT_MAX) | |
2009 | ce->e_reusable = 0; | |
ac27a0ec | 2010 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
6048c64b | 2011 | ref); |
dac7a4b4 | 2012 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec | 2013 | unlock_buffer(new_bh); |
dac7a4b4 TT |
2014 | error = ext4_handle_dirty_metadata(handle, |
2015 | inode, | |
2016 | new_bh); | |
ac27a0ec DK |
2017 | if (error) |
2018 | goto cleanup_dquot; | |
2019 | } | |
47387409 TE |
2020 | mb_cache_entry_touch(ea_block_cache, ce); |
2021 | mb_cache_entry_put(ea_block_cache, ce); | |
ac27a0ec DK |
2022 | ce = NULL; |
2023 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
2024 | /* We were modifying this block in-place. */ | |
2025 | ea_bdebug(bs->bh, "keeping this block"); | |
ec000220 | 2026 | ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); |
ac27a0ec DK |
2027 | new_bh = bs->bh; |
2028 | get_bh(new_bh); | |
2029 | } else { | |
2030 | /* We need to allocate a new block */ | |
fb0a387d ES |
2031 | ext4_fsblk_t goal, block; |
2032 | ||
b8cb5a54 TE |
2033 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
2034 | ||
fb0a387d | 2035 | goal = ext4_group_first_block_no(sb, |
d00a6d7b | 2036 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
2037 | |
2038 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 2039 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2040 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
2041 | ||
55f020db AH |
2042 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
2043 | NULL, &error); | |
ac27a0ec DK |
2044 | if (error) |
2045 | goto cleanup; | |
fb0a387d | 2046 | |
12e9b892 | 2047 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2048 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
2049 | ||
ace36ad4 JP |
2050 | ea_idebug(inode, "creating block %llu", |
2051 | (unsigned long long)block); | |
ac27a0ec DK |
2052 | |
2053 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 2054 | if (unlikely(!new_bh)) { |
860d21e2 | 2055 | error = -ENOMEM; |
ac27a0ec | 2056 | getblk_failed: |
7dc57615 | 2057 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 2058 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
2059 | goto cleanup; |
2060 | } | |
dec214d0 TE |
2061 | error = ext4_xattr_inode_inc_ref_all(handle, inode, |
2062 | ENTRY(header(s->base)+1)); | |
2063 | if (error) | |
2064 | goto getblk_failed; | |
2065 | if (ea_inode) { | |
2066 | /* Drop the extra ref on ea_inode. */ | |
2067 | error = ext4_xattr_inode_dec_ref(handle, | |
2068 | ea_inode); | |
2069 | if (error) | |
2070 | ext4_warning_inode(ea_inode, | |
2071 | "dec ref error=%d", | |
2072 | error); | |
2073 | iput(ea_inode); | |
2074 | ea_inode = NULL; | |
2075 | } | |
2076 | ||
ac27a0ec | 2077 | lock_buffer(new_bh); |
617ba13b | 2078 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
2079 | if (error) { |
2080 | unlock_buffer(new_bh); | |
860d21e2 | 2081 | error = -EIO; |
ac27a0ec DK |
2082 | goto getblk_failed; |
2083 | } | |
2084 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
dac7a4b4 | 2085 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec DK |
2086 | set_buffer_uptodate(new_bh); |
2087 | unlock_buffer(new_bh); | |
47387409 | 2088 | ext4_xattr_block_cache_insert(ea_block_cache, new_bh); |
dac7a4b4 TT |
2089 | error = ext4_handle_dirty_metadata(handle, inode, |
2090 | new_bh); | |
ac27a0ec DK |
2091 | if (error) |
2092 | goto cleanup; | |
2093 | } | |
2094 | } | |
2095 | ||
a6d05676 TE |
2096 | if (old_ea_inode_quota) |
2097 | ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); | |
dec214d0 | 2098 | |
ac27a0ec | 2099 | /* Update the inode. */ |
617ba13b | 2100 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
2101 | |
2102 | /* Drop the previous xattr block. */ | |
dec214d0 TE |
2103 | if (bs->bh && bs->bh != new_bh) { |
2104 | struct ext4_xattr_inode_array *ea_inode_array = NULL; | |
2105 | ||
2106 | ext4_xattr_release_block(handle, inode, bs->bh, | |
2107 | &ea_inode_array, | |
2108 | 0 /* extra_credits */); | |
2109 | ext4_xattr_inode_array_free(ea_inode_array); | |
2110 | } | |
ac27a0ec DK |
2111 | error = 0; |
2112 | ||
2113 | cleanup: | |
dec214d0 TE |
2114 | if (ea_inode) { |
2115 | int error2; | |
2116 | ||
2117 | error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
2118 | if (error2) | |
2119 | ext4_warning_inode(ea_inode, "dec ref error=%d", | |
2120 | error2); | |
2121 | ||
2122 | /* If there was an error, revert the quota charge. */ | |
2123 | if (error) | |
a6d05676 | 2124 | ext4_xattr_inode_free_quota(inode, ea_inode, |
dec214d0 TE |
2125 | i_size_read(ea_inode)); |
2126 | iput(ea_inode); | |
2127 | } | |
ac27a0ec | 2128 | if (ce) |
47387409 | 2129 | mb_cache_entry_put(ea_block_cache, ce); |
ac27a0ec DK |
2130 | brelse(new_bh); |
2131 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
2132 | kfree(s->base); | |
2133 | ||
2134 | return error; | |
2135 | ||
2136 | cleanup_dquot: | |
1231b3a1 | 2137 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
2138 | goto cleanup; |
2139 | ||
2140 | bad_block: | |
24676da4 TT |
2141 | EXT4_ERROR_INODE(inode, "bad block %llu", |
2142 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
2143 | goto cleanup; |
2144 | ||
2145 | #undef header | |
2146 | } | |
2147 | ||
879b3825 TM |
2148 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
2149 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2150 | { |
617ba13b MC |
2151 | struct ext4_xattr_ibody_header *header; |
2152 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
2153 | int error; |
2154 | ||
617ba13b | 2155 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 2156 | return 0; |
617ba13b | 2157 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
2158 | header = IHDR(inode, raw_inode); |
2159 | is->s.base = is->s.first = IFIRST(header); | |
2160 | is->s.here = is->s.first; | |
617ba13b | 2161 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 2162 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
9e92f48c | 2163 | error = xattr_check_inode(inode, header, is->s.end); |
ac27a0ec DK |
2164 | if (error) |
2165 | return error; | |
2166 | /* Find the named attribute. */ | |
617ba13b | 2167 | error = ext4_xattr_find_entry(&is->s.here, i->name_index, |
6ba644b9 | 2168 | i->name, 0); |
ac27a0ec DK |
2169 | if (error && error != -ENODATA) |
2170 | return error; | |
2171 | is->s.not_found = error; | |
2172 | } | |
2173 | return 0; | |
2174 | } | |
2175 | ||
0d812f77 TM |
2176 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
2177 | struct ext4_xattr_info *i, | |
2178 | struct ext4_xattr_ibody_find *is) | |
2179 | { | |
2180 | struct ext4_xattr_ibody_header *header; | |
2181 | struct ext4_xattr_search *s = &is->s; | |
2182 | int error; | |
2183 | ||
2184 | if (EXT4_I(inode)->i_extra_isize == 0) | |
2185 | return -ENOSPC; | |
daf83281 | 2186 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
0d812f77 TM |
2187 | if (error) { |
2188 | if (error == -ENOSPC && | |
2189 | ext4_has_inline_data(inode)) { | |
2190 | error = ext4_try_to_evict_inline_data(handle, inode, | |
2191 | EXT4_XATTR_LEN(strlen(i->name) + | |
2192 | EXT4_XATTR_SIZE(i->value_len))); | |
2193 | if (error) | |
2194 | return error; | |
2195 | error = ext4_xattr_ibody_find(inode, i, is); | |
2196 | if (error) | |
2197 | return error; | |
daf83281 TE |
2198 | error = ext4_xattr_set_entry(i, s, handle, inode, |
2199 | false /* is_block */); | |
0d812f77 TM |
2200 | } |
2201 | if (error) | |
2202 | return error; | |
2203 | } | |
2204 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); | |
2205 | if (!IS_LAST_ENTRY(s->first)) { | |
2206 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
2207 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
2208 | } else { | |
2209 | header->h_magic = cpu_to_le32(0); | |
2210 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
2211 | } | |
2212 | return 0; | |
2213 | } | |
2214 | ||
e50e5129 | 2215 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, |
0d812f77 TM |
2216 | struct ext4_xattr_info *i, |
2217 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2218 | { |
617ba13b MC |
2219 | struct ext4_xattr_ibody_header *header; |
2220 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
2221 | int error; |
2222 | ||
617ba13b | 2223 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 2224 | return -ENOSPC; |
daf83281 | 2225 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
ac27a0ec DK |
2226 | if (error) |
2227 | return error; | |
617ba13b | 2228 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 2229 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 2230 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 2231 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2232 | } else { |
2233 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 2234 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2235 | } |
2236 | return 0; | |
2237 | } | |
2238 | ||
3fd16462 JK |
2239 | static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
2240 | struct ext4_xattr_info *i) | |
2241 | { | |
2242 | void *value; | |
2243 | ||
0bd454c0 TE |
2244 | /* When e_value_inum is set the value is stored externally. */ |
2245 | if (s->here->e_value_inum) | |
2246 | return 0; | |
3fd16462 JK |
2247 | if (le32_to_cpu(s->here->e_value_size) != i->value_len) |
2248 | return 0; | |
2249 | value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); | |
2250 | return !memcmp(value, i->value, i->value_len); | |
2251 | } | |
2252 | ||
dec214d0 TE |
2253 | static struct buffer_head *ext4_xattr_get_block(struct inode *inode) |
2254 | { | |
2255 | struct buffer_head *bh; | |
2256 | int error; | |
2257 | ||
2258 | if (!EXT4_I(inode)->i_file_acl) | |
2259 | return NULL; | |
2260 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
2261 | if (!bh) | |
2262 | return ERR_PTR(-EIO); | |
2263 | error = ext4_xattr_check_block(inode, bh); | |
2264 | if (error) | |
2265 | return ERR_PTR(error); | |
2266 | return bh; | |
2267 | } | |
2268 | ||
ac27a0ec | 2269 | /* |
617ba13b | 2270 | * ext4_xattr_set_handle() |
ac27a0ec | 2271 | * |
6e9510b0 | 2272 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
2273 | * is NULL to remove an existing extended attribute, and non-NULL to |
2274 | * either replace an existing extended attribute, or create a new extended | |
2275 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
2276 | * specify that an extended attribute must exist and must not exist | |
2277 | * previous to the call, respectively. | |
2278 | * | |
2279 | * Returns 0, or a negative error number on failure. | |
2280 | */ | |
2281 | int | |
617ba13b | 2282 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
2283 | const char *name, const void *value, size_t value_len, |
2284 | int flags) | |
2285 | { | |
617ba13b | 2286 | struct ext4_xattr_info i = { |
ac27a0ec DK |
2287 | .name_index = name_index, |
2288 | .name = name, | |
2289 | .value = value, | |
2290 | .value_len = value_len, | |
e50e5129 | 2291 | .in_inode = 0, |
ac27a0ec | 2292 | }; |
617ba13b | 2293 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
2294 | .s = { .not_found = -ENODATA, }, |
2295 | }; | |
617ba13b | 2296 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
2297 | .s = { .not_found = -ENODATA, }, |
2298 | }; | |
c755e251 | 2299 | int no_expand; |
ac27a0ec DK |
2300 | int error; |
2301 | ||
2302 | if (!name) | |
2303 | return -EINVAL; | |
2304 | if (strlen(name) > 255) | |
2305 | return -ERANGE; | |
b8cb5a54 | 2306 | |
c755e251 | 2307 | ext4_write_lock_xattr(inode, &no_expand); |
4d20c685 | 2308 | |
c1a5d5f6 TE |
2309 | /* Check journal credits under write lock. */ |
2310 | if (ext4_handle_valid(handle)) { | |
dec214d0 | 2311 | struct buffer_head *bh; |
c1a5d5f6 TE |
2312 | int credits; |
2313 | ||
dec214d0 TE |
2314 | bh = ext4_xattr_get_block(inode); |
2315 | if (IS_ERR(bh)) { | |
2316 | error = PTR_ERR(bh); | |
2317 | goto cleanup; | |
2318 | } | |
2319 | ||
af65207c TE |
2320 | credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2321 | value_len, | |
2322 | flags & XATTR_CREATE); | |
dec214d0 TE |
2323 | brelse(bh); |
2324 | ||
c1a5d5f6 TE |
2325 | if (!ext4_handle_has_enough_credits(handle, credits)) { |
2326 | error = -ENOSPC; | |
2327 | goto cleanup; | |
2328 | } | |
2329 | } | |
2330 | ||
66543617 | 2331 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
2332 | if (error) |
2333 | goto cleanup; | |
2334 | ||
19f5fb7a | 2335 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
2336 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
2337 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 2338 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
2339 | } |
2340 | ||
617ba13b | 2341 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
2342 | if (error) |
2343 | goto cleanup; | |
2344 | if (is.s.not_found) | |
617ba13b | 2345 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
2346 | if (error) |
2347 | goto cleanup; | |
2348 | if (is.s.not_found && bs.s.not_found) { | |
2349 | error = -ENODATA; | |
2350 | if (flags & XATTR_REPLACE) | |
2351 | goto cleanup; | |
2352 | error = 0; | |
2353 | if (!value) | |
2354 | goto cleanup; | |
2355 | } else { | |
2356 | error = -EEXIST; | |
2357 | if (flags & XATTR_CREATE) | |
2358 | goto cleanup; | |
2359 | } | |
dec214d0 | 2360 | |
ac27a0ec DK |
2361 | if (!value) { |
2362 | if (!is.s.not_found) | |
e50e5129 | 2363 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 2364 | else if (!bs.s.not_found) |
617ba13b | 2365 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2366 | } else { |
3fd16462 JK |
2367 | error = 0; |
2368 | /* Xattr value did not change? Save us some work and bail out */ | |
2369 | if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) | |
2370 | goto cleanup; | |
2371 | if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) | |
2372 | goto cleanup; | |
2373 | ||
b347e2bc TE |
2374 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2375 | (EXT4_XATTR_SIZE(i.value_len) > | |
2376 | EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) | |
2377 | i.in_inode = 1; | |
2378 | retry_inode: | |
e50e5129 | 2379 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
2380 | if (!error && !bs.s.not_found) { |
2381 | i.value = NULL; | |
617ba13b | 2382 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2383 | } else if (error == -ENOSPC) { |
7e01c8e5 TY |
2384 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
2385 | error = ext4_xattr_block_find(inode, &i, &bs); | |
2386 | if (error) | |
2387 | goto cleanup; | |
2388 | } | |
617ba13b | 2389 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
b347e2bc | 2390 | if (!error && !is.s.not_found) { |
ac27a0ec | 2391 | i.value = NULL; |
e50e5129 AD |
2392 | error = ext4_xattr_ibody_set(handle, inode, &i, |
2393 | &is); | |
b347e2bc TE |
2394 | } else if (error == -ENOSPC) { |
2395 | /* | |
2396 | * Xattr does not fit in the block, store at | |
2397 | * external inode if possible. | |
2398 | */ | |
2399 | if (ext4_has_feature_ea_inode(inode->i_sb) && | |
2400 | !i.in_inode) { | |
2401 | i.in_inode = 1; | |
2402 | goto retry_inode; | |
2403 | } | |
ac27a0ec DK |
2404 | } |
2405 | } | |
2406 | } | |
2407 | if (!error) { | |
617ba13b | 2408 | ext4_xattr_update_super_block(handle, inode->i_sb); |
eeca7ea1 | 2409 | inode->i_ctime = current_time(inode); |
6dd4ee7c | 2410 | if (!value) |
c755e251 | 2411 | no_expand = 0; |
617ba13b | 2412 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 2413 | /* |
617ba13b | 2414 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
2415 | * error != 0. |
2416 | */ | |
2417 | is.iloc.bh = NULL; | |
2418 | if (IS_SYNC(inode)) | |
0390131b | 2419 | ext4_handle_sync(handle); |
ac27a0ec DK |
2420 | } |
2421 | ||
2422 | cleanup: | |
2423 | brelse(is.iloc.bh); | |
2424 | brelse(bs.bh); | |
c755e251 | 2425 | ext4_write_unlock_xattr(inode, &no_expand); |
ac27a0ec DK |
2426 | return error; |
2427 | } | |
2428 | ||
af65207c TE |
2429 | int ext4_xattr_set_credits(struct inode *inode, size_t value_len, |
2430 | bool is_create, int *credits) | |
c1a5d5f6 | 2431 | { |
dec214d0 TE |
2432 | struct buffer_head *bh; |
2433 | int err; | |
c1a5d5f6 | 2434 | |
dec214d0 | 2435 | *credits = 0; |
c1a5d5f6 | 2436 | |
dec214d0 TE |
2437 | if (!EXT4_SB(inode->i_sb)->s_journal) |
2438 | return 0; | |
c1a5d5f6 | 2439 | |
dec214d0 | 2440 | down_read(&EXT4_I(inode)->xattr_sem); |
c1a5d5f6 | 2441 | |
dec214d0 TE |
2442 | bh = ext4_xattr_get_block(inode); |
2443 | if (IS_ERR(bh)) { | |
2444 | err = PTR_ERR(bh); | |
2445 | } else { | |
af65207c TE |
2446 | *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2447 | value_len, is_create); | |
dec214d0 TE |
2448 | brelse(bh); |
2449 | err = 0; | |
c1a5d5f6 | 2450 | } |
dec214d0 TE |
2451 | |
2452 | up_read(&EXT4_I(inode)->xattr_sem); | |
2453 | return err; | |
c1a5d5f6 TE |
2454 | } |
2455 | ||
ac27a0ec | 2456 | /* |
617ba13b | 2457 | * ext4_xattr_set() |
ac27a0ec | 2458 | * |
617ba13b | 2459 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
2460 | * attribute modification is a filesystem transaction by itself. |
2461 | * | |
2462 | * Returns 0, or a negative error number on failure. | |
2463 | */ | |
2464 | int | |
617ba13b | 2465 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
2466 | const void *value, size_t value_len, int flags) |
2467 | { | |
2468 | handle_t *handle; | |
e50e5129 | 2469 | struct super_block *sb = inode->i_sb; |
ac27a0ec | 2470 | int error, retries = 0; |
c1a5d5f6 | 2471 | int credits; |
ac27a0ec | 2472 | |
b8cb5a54 TE |
2473 | error = dquot_initialize(inode); |
2474 | if (error) | |
2475 | return error; | |
e50e5129 | 2476 | |
ac27a0ec | 2477 | retry: |
af65207c TE |
2478 | error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, |
2479 | &credits); | |
dec214d0 TE |
2480 | if (error) |
2481 | return error; | |
2482 | ||
9924a92a | 2483 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
2484 | if (IS_ERR(handle)) { |
2485 | error = PTR_ERR(handle); | |
2486 | } else { | |
2487 | int error2; | |
2488 | ||
617ba13b | 2489 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 2490 | value, value_len, flags); |
617ba13b | 2491 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 2492 | if (error == -ENOSPC && |
e50e5129 | 2493 | ext4_should_retry_alloc(sb, &retries)) |
ac27a0ec DK |
2494 | goto retry; |
2495 | if (error == 0) | |
2496 | error = error2; | |
2497 | } | |
2498 | ||
2499 | return error; | |
2500 | } | |
2501 | ||
6dd4ee7c KS |
2502 | /* |
2503 | * Shift the EA entries in the inode to create space for the increased | |
2504 | * i_extra_isize. | |
2505 | */ | |
2506 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
2507 | int value_offs_shift, void *to, | |
94405713 | 2508 | void *from, size_t n) |
6dd4ee7c KS |
2509 | { |
2510 | struct ext4_xattr_entry *last = entry; | |
2511 | int new_offs; | |
2512 | ||
94405713 JK |
2513 | /* We always shift xattr headers further thus offsets get lower */ |
2514 | BUG_ON(value_offs_shift > 0); | |
2515 | ||
6dd4ee7c KS |
2516 | /* Adjust the value offsets of the entries */ |
2517 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 2518 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
2519 | new_offs = le16_to_cpu(last->e_value_offs) + |
2520 | value_offs_shift; | |
6dd4ee7c KS |
2521 | last->e_value_offs = cpu_to_le16(new_offs); |
2522 | } | |
2523 | } | |
2524 | /* Shift the entries by n bytes */ | |
2525 | memmove(to, from, n); | |
2526 | } | |
2527 | ||
3f2571c1 JK |
2528 | /* |
2529 | * Move xattr pointed to by 'entry' from inode into external xattr block | |
2530 | */ | |
2531 | static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, | |
2532 | struct ext4_inode *raw_inode, | |
2533 | struct ext4_xattr_entry *entry) | |
2534 | { | |
2535 | struct ext4_xattr_ibody_find *is = NULL; | |
2536 | struct ext4_xattr_block_find *bs = NULL; | |
2537 | char *buffer = NULL, *b_entry_name = NULL; | |
f6109100 | 2538 | size_t value_size = le32_to_cpu(entry->e_value_size); |
3f2571c1 JK |
2539 | struct ext4_xattr_info i = { |
2540 | .value = NULL, | |
2541 | .value_len = 0, | |
2542 | .name_index = entry->e_name_index, | |
f6109100 | 2543 | .in_inode = !!entry->e_value_inum, |
3f2571c1 JK |
2544 | }; |
2545 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2546 | int error; | |
2547 | ||
3f2571c1 JK |
2548 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); |
2549 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
2550 | buffer = kmalloc(value_size, GFP_NOFS); | |
2551 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
2552 | if (!is || !bs || !buffer || !b_entry_name) { | |
2553 | error = -ENOMEM; | |
2554 | goto out; | |
2555 | } | |
2556 | ||
2557 | is->s.not_found = -ENODATA; | |
2558 | bs->s.not_found = -ENODATA; | |
2559 | is->iloc.bh = NULL; | |
2560 | bs->bh = NULL; | |
2561 | ||
2562 | /* Save the entry name and the entry value */ | |
f6109100 | 2563 | if (entry->e_value_inum) { |
b9fc761e | 2564 | error = ext4_xattr_inode_get(inode, entry, buffer, value_size); |
f6109100 TE |
2565 | if (error) |
2566 | goto out; | |
2567 | } else { | |
2568 | size_t value_offs = le16_to_cpu(entry->e_value_offs); | |
2569 | memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); | |
2570 | } | |
2571 | ||
3f2571c1 JK |
2572 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); |
2573 | b_entry_name[entry->e_name_len] = '\0'; | |
2574 | i.name = b_entry_name; | |
2575 | ||
2576 | error = ext4_get_inode_loc(inode, &is->iloc); | |
2577 | if (error) | |
2578 | goto out; | |
2579 | ||
2580 | error = ext4_xattr_ibody_find(inode, &i, is); | |
2581 | if (error) | |
2582 | goto out; | |
2583 | ||
2584 | /* Remove the chosen entry from the inode */ | |
e50e5129 | 2585 | error = ext4_xattr_ibody_set(handle, inode, &i, is); |
3f2571c1 JK |
2586 | if (error) |
2587 | goto out; | |
2588 | ||
3f2571c1 JK |
2589 | i.value = buffer; |
2590 | i.value_len = value_size; | |
2591 | error = ext4_xattr_block_find(inode, &i, bs); | |
2592 | if (error) | |
2593 | goto out; | |
2594 | ||
2595 | /* Add entry which was removed from the inode into the block */ | |
2596 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
2597 | if (error) | |
2598 | goto out; | |
2599 | error = 0; | |
2600 | out: | |
2601 | kfree(b_entry_name); | |
2602 | kfree(buffer); | |
2603 | if (is) | |
2604 | brelse(is->iloc.bh); | |
2605 | kfree(is); | |
2606 | kfree(bs); | |
2607 | ||
2608 | return error; | |
2609 | } | |
2610 | ||
dfa2064b JK |
2611 | static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, |
2612 | struct ext4_inode *raw_inode, | |
2613 | int isize_diff, size_t ifree, | |
2614 | size_t bfree, int *total_ino) | |
2615 | { | |
2616 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2617 | struct ext4_xattr_entry *small_entry; | |
2618 | struct ext4_xattr_entry *entry; | |
2619 | struct ext4_xattr_entry *last; | |
2620 | unsigned int entry_size; /* EA entry size */ | |
2621 | unsigned int total_size; /* EA entry size + value size */ | |
2622 | unsigned int min_total_size; | |
2623 | int error; | |
2624 | ||
2625 | while (isize_diff > ifree) { | |
2626 | entry = NULL; | |
2627 | small_entry = NULL; | |
2628 | min_total_size = ~0U; | |
2629 | last = IFIRST(header); | |
2630 | /* Find the entry best suited to be pushed into EA block */ | |
2631 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
9bb21ced TE |
2632 | total_size = EXT4_XATTR_LEN(last->e_name_len); |
2633 | if (!last->e_value_inum) | |
2634 | total_size += EXT4_XATTR_SIZE( | |
2635 | le32_to_cpu(last->e_value_size)); | |
dfa2064b JK |
2636 | if (total_size <= bfree && |
2637 | total_size < min_total_size) { | |
2638 | if (total_size + ifree < isize_diff) { | |
2639 | small_entry = last; | |
2640 | } else { | |
2641 | entry = last; | |
2642 | min_total_size = total_size; | |
2643 | } | |
2644 | } | |
2645 | } | |
2646 | ||
2647 | if (entry == NULL) { | |
2648 | if (small_entry == NULL) | |
2649 | return -ENOSPC; | |
2650 | entry = small_entry; | |
2651 | } | |
2652 | ||
2653 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
9bb21ced TE |
2654 | total_size = entry_size; |
2655 | if (!entry->e_value_inum) | |
2656 | total_size += EXT4_XATTR_SIZE( | |
2657 | le32_to_cpu(entry->e_value_size)); | |
dfa2064b JK |
2658 | error = ext4_xattr_move_to_block(handle, inode, raw_inode, |
2659 | entry); | |
2660 | if (error) | |
2661 | return error; | |
2662 | ||
2663 | *total_ino -= entry_size; | |
2664 | ifree += total_size; | |
2665 | bfree -= total_size; | |
2666 | } | |
2667 | ||
2668 | return 0; | |
2669 | } | |
2670 | ||
6dd4ee7c KS |
2671 | /* |
2672 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
2673 | * Returns 0 on success or negative error number on failure. | |
2674 | */ | |
2675 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
2676 | struct ext4_inode *raw_inode, handle_t *handle) | |
2677 | { | |
2678 | struct ext4_xattr_ibody_header *header; | |
b640b2c5 | 2679 | struct buffer_head *bh; |
cf0a5e81 MX |
2680 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
2681 | static unsigned int mnt_count; | |
e3014d14 JK |
2682 | size_t min_offs; |
2683 | size_t ifree, bfree; | |
7b1b2c1b | 2684 | int total_ino; |
6e0cd088 | 2685 | void *base, *end; |
d0141191 | 2686 | int error = 0, tried_min_extra_isize = 0; |
cf0a5e81 | 2687 | int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); |
d0141191 | 2688 | int isize_diff; /* How much do we need to grow i_extra_isize */ |
6dd4ee7c | 2689 | |
6dd4ee7c | 2690 | retry: |
d0141191 | 2691 | isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; |
2e81a4ee | 2692 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) |
b640b2c5 | 2693 | return 0; |
6dd4ee7c KS |
2694 | |
2695 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
2696 | |
2697 | /* | |
2698 | * Check if enough free space is available in the inode to shift the | |
2699 | * entries ahead by new_extra_isize. | |
2700 | */ | |
2701 | ||
6e0cd088 | 2702 | base = IFIRST(header); |
6dd4ee7c KS |
2703 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
2704 | min_offs = end - base; | |
6dd4ee7c KS |
2705 | total_ino = sizeof(struct ext4_xattr_ibody_header); |
2706 | ||
9e92f48c TT |
2707 | error = xattr_check_inode(inode, header, end); |
2708 | if (error) | |
2709 | goto cleanup; | |
2710 | ||
6e0cd088 | 2711 | ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); |
e3014d14 JK |
2712 | if (ifree >= isize_diff) |
2713 | goto shift; | |
6dd4ee7c KS |
2714 | |
2715 | /* | |
2716 | * Enough free space isn't available in the inode, check if | |
2717 | * EA block can hold new_extra_isize bytes. | |
2718 | */ | |
2719 | if (EXT4_I(inode)->i_file_acl) { | |
2720 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
2721 | error = -EIO; | |
2722 | if (!bh) | |
2723 | goto cleanup; | |
cc8e94fd | 2724 | if (ext4_xattr_check_block(inode, bh)) { |
24676da4 TT |
2725 | EXT4_ERROR_INODE(inode, "bad block %llu", |
2726 | EXT4_I(inode)->i_file_acl); | |
6a797d27 | 2727 | error = -EFSCORRUPTED; |
b640b2c5 | 2728 | brelse(bh); |
6dd4ee7c KS |
2729 | goto cleanup; |
2730 | } | |
2731 | base = BHDR(bh); | |
6dd4ee7c KS |
2732 | end = bh->b_data + bh->b_size; |
2733 | min_offs = end - base; | |
6e0cd088 JK |
2734 | bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, |
2735 | NULL); | |
b640b2c5 | 2736 | brelse(bh); |
e3014d14 | 2737 | if (bfree + ifree < isize_diff) { |
6dd4ee7c KS |
2738 | if (!tried_min_extra_isize && s_min_extra_isize) { |
2739 | tried_min_extra_isize++; | |
2740 | new_extra_isize = s_min_extra_isize; | |
6dd4ee7c KS |
2741 | goto retry; |
2742 | } | |
dfa2064b | 2743 | error = -ENOSPC; |
6dd4ee7c KS |
2744 | goto cleanup; |
2745 | } | |
2746 | } else { | |
e3014d14 | 2747 | bfree = inode->i_sb->s_blocksize; |
6dd4ee7c KS |
2748 | } |
2749 | ||
dfa2064b JK |
2750 | error = ext4_xattr_make_inode_space(handle, inode, raw_inode, |
2751 | isize_diff, ifree, bfree, | |
2752 | &total_ino); | |
2753 | if (error) { | |
2754 | if (error == -ENOSPC && !tried_min_extra_isize && | |
2755 | s_min_extra_isize) { | |
2756 | tried_min_extra_isize++; | |
2757 | new_extra_isize = s_min_extra_isize; | |
dfa2064b | 2758 | goto retry; |
6dd4ee7c | 2759 | } |
dfa2064b | 2760 | goto cleanup; |
6dd4ee7c | 2761 | } |
e3014d14 JK |
2762 | shift: |
2763 | /* Adjust the offsets and shift the remaining entries ahead */ | |
6e0cd088 | 2764 | ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize |
e3014d14 JK |
2765 | - new_extra_isize, (void *)raw_inode + |
2766 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
94405713 | 2767 | (void *)header, total_ino); |
e3014d14 | 2768 | EXT4_I(inode)->i_extra_isize = new_extra_isize; |
6dd4ee7c KS |
2769 | |
2770 | cleanup: | |
b640b2c5 | 2771 | if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { |
cf0a5e81 MX |
2772 | ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", |
2773 | inode->i_ino); | |
2774 | mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); | |
2775 | } | |
6dd4ee7c KS |
2776 | return error; |
2777 | } | |
2778 | ||
e50e5129 AD |
2779 | #define EIA_INCR 16 /* must be 2^n */ |
2780 | #define EIA_MASK (EIA_INCR - 1) | |
dec214d0 TE |
2781 | |
2782 | /* Add the large xattr @inode into @ea_inode_array for deferred iput(). | |
0421a189 | 2783 | * If @ea_inode_array is new or full it will be grown and the old |
e50e5129 AD |
2784 | * contents copied over. |
2785 | */ | |
2786 | static int | |
0421a189 TE |
2787 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, |
2788 | struct inode *inode) | |
e50e5129 | 2789 | { |
0421a189 | 2790 | if (*ea_inode_array == NULL) { |
e50e5129 AD |
2791 | /* |
2792 | * Start with 15 inodes, so it fits into a power-of-two size. | |
0421a189 | 2793 | * If *ea_inode_array is NULL, this is essentially offsetof() |
e50e5129 | 2794 | */ |
0421a189 TE |
2795 | (*ea_inode_array) = |
2796 | kmalloc(offsetof(struct ext4_xattr_inode_array, | |
2797 | inodes[EIA_MASK]), | |
e50e5129 | 2798 | GFP_NOFS); |
0421a189 | 2799 | if (*ea_inode_array == NULL) |
e50e5129 | 2800 | return -ENOMEM; |
0421a189 TE |
2801 | (*ea_inode_array)->count = 0; |
2802 | } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { | |
e50e5129 | 2803 | /* expand the array once all 15 + n * 16 slots are full */ |
0421a189 TE |
2804 | struct ext4_xattr_inode_array *new_array = NULL; |
2805 | int count = (*ea_inode_array)->count; | |
e50e5129 AD |
2806 | |
2807 | /* if new_array is NULL, this is essentially offsetof() */ | |
2808 | new_array = kmalloc( | |
0421a189 TE |
2809 | offsetof(struct ext4_xattr_inode_array, |
2810 | inodes[count + EIA_INCR]), | |
e50e5129 AD |
2811 | GFP_NOFS); |
2812 | if (new_array == NULL) | |
2813 | return -ENOMEM; | |
0421a189 TE |
2814 | memcpy(new_array, *ea_inode_array, |
2815 | offsetof(struct ext4_xattr_inode_array, inodes[count])); | |
2816 | kfree(*ea_inode_array); | |
2817 | *ea_inode_array = new_array; | |
e50e5129 | 2818 | } |
0421a189 | 2819 | (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; |
e50e5129 AD |
2820 | return 0; |
2821 | } | |
2822 | ||
ac27a0ec | 2823 | /* |
617ba13b | 2824 | * ext4_xattr_delete_inode() |
ac27a0ec | 2825 | * |
e50e5129 | 2826 | * Free extended attribute resources associated with this inode. Traverse |
dec214d0 TE |
2827 | * all entries and decrement reference on any xattr inodes associated with this |
2828 | * inode. This is called immediately before an inode is freed. We have exclusive | |
2829 | * access to the inode. If an orphan inode is deleted it will also release its | |
2830 | * references on xattr block and xattr inodes. | |
ac27a0ec | 2831 | */ |
dec214d0 TE |
2832 | int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, |
2833 | struct ext4_xattr_inode_array **ea_inode_array, | |
2834 | int extra_credits) | |
ac27a0ec DK |
2835 | { |
2836 | struct buffer_head *bh = NULL; | |
e50e5129 | 2837 | struct ext4_xattr_ibody_header *header; |
30a7eb97 | 2838 | struct ext4_iloc iloc = { .bh = NULL }; |
dec214d0 | 2839 | struct ext4_xattr_entry *entry; |
a6d05676 | 2840 | struct inode *ea_inode; |
30a7eb97 TE |
2841 | int error; |
2842 | ||
2843 | error = ext4_xattr_ensure_credits(handle, inode, extra_credits, | |
2844 | NULL /* bh */, | |
2845 | false /* dirty */, | |
2846 | false /* block_csum */); | |
2847 | if (error) { | |
2848 | EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); | |
2849 | goto cleanup; | |
2850 | } | |
ac27a0ec | 2851 | |
dec214d0 TE |
2852 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2853 | ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
e50e5129 | 2854 | |
dec214d0 TE |
2855 | error = ext4_get_inode_loc(inode, &iloc); |
2856 | if (error) { | |
2857 | EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); | |
2858 | goto cleanup; | |
2859 | } | |
30a7eb97 | 2860 | |
dec214d0 TE |
2861 | error = ext4_journal_get_write_access(handle, iloc.bh); |
2862 | if (error) { | |
2863 | EXT4_ERROR_INODE(inode, "write access (error %d)", | |
2864 | error); | |
2865 | goto cleanup; | |
2866 | } | |
e50e5129 | 2867 | |
dec214d0 TE |
2868 | header = IHDR(inode, ext4_raw_inode(&iloc)); |
2869 | if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) | |
2870 | ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, | |
2871 | IFIRST(header), | |
2872 | false /* block_csum */, | |
2873 | ea_inode_array, | |
2874 | extra_credits, | |
2875 | false /* skip_quota */); | |
ac27a0ec | 2876 | } |
e50e5129 | 2877 | |
dec214d0 TE |
2878 | if (EXT4_I(inode)->i_file_acl) { |
2879 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
2880 | if (!bh) { | |
2881 | EXT4_ERROR_INODE(inode, "block %llu read error", | |
30a7eb97 | 2882 | EXT4_I(inode)->i_file_acl); |
dec214d0 TE |
2883 | error = -EIO; |
2884 | goto cleanup; | |
2885 | } | |
2886 | error = ext4_xattr_check_block(inode, bh); | |
2887 | if (error) { | |
2888 | EXT4_ERROR_INODE(inode, "bad block %llu (error %d)", | |
2889 | EXT4_I(inode)->i_file_acl, error); | |
e50e5129 AD |
2890 | goto cleanup; |
2891 | } | |
e50e5129 | 2892 | |
dec214d0 TE |
2893 | if (ext4_has_feature_ea_inode(inode->i_sb)) { |
2894 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
a6d05676 TE |
2895 | entry = EXT4_XATTR_NEXT(entry)) { |
2896 | if (!entry->e_value_inum) | |
2897 | continue; | |
2898 | error = ext4_xattr_inode_iget(inode, | |
2899 | le32_to_cpu(entry->e_value_inum), | |
2900 | le32_to_cpu(entry->e_hash), | |
2901 | &ea_inode); | |
2902 | if (error) | |
2903 | continue; | |
2904 | ext4_xattr_inode_free_quota(inode, ea_inode, | |
dec214d0 | 2905 | le32_to_cpu(entry->e_value_size)); |
a6d05676 TE |
2906 | iput(ea_inode); |
2907 | } | |
dec214d0 TE |
2908 | |
2909 | } | |
2910 | ||
2911 | ext4_xattr_release_block(handle, inode, bh, ea_inode_array, | |
2912 | extra_credits); | |
2913 | /* | |
2914 | * Update i_file_acl value in the same transaction that releases | |
2915 | * block. | |
2916 | */ | |
2917 | EXT4_I(inode)->i_file_acl = 0; | |
2918 | error = ext4_mark_inode_dirty(handle, inode); | |
2919 | if (error) { | |
2920 | EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", | |
2921 | error); | |
2922 | goto cleanup; | |
2923 | } | |
30a7eb97 | 2924 | } |
dec214d0 | 2925 | error = 0; |
ac27a0ec | 2926 | cleanup: |
30a7eb97 | 2927 | brelse(iloc.bh); |
ac27a0ec | 2928 | brelse(bh); |
e50e5129 AD |
2929 | return error; |
2930 | } | |
2931 | ||
0421a189 | 2932 | void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) |
e50e5129 | 2933 | { |
dec214d0 | 2934 | int idx; |
e50e5129 | 2935 | |
0421a189 | 2936 | if (ea_inode_array == NULL) |
e50e5129 AD |
2937 | return; |
2938 | ||
dec214d0 TE |
2939 | for (idx = 0; idx < ea_inode_array->count; ++idx) |
2940 | iput(ea_inode_array->inodes[idx]); | |
0421a189 | 2941 | kfree(ea_inode_array); |
ac27a0ec DK |
2942 | } |
2943 | ||
ac27a0ec | 2944 | /* |
47387409 | 2945 | * ext4_xattr_block_cache_insert() |
ac27a0ec | 2946 | * |
47387409 | 2947 | * Create a new entry in the extended attribute block cache, and insert |
ac27a0ec DK |
2948 | * it unless such an entry is already in the cache. |
2949 | * | |
2950 | * Returns 0, or a negative error number on failure. | |
2951 | */ | |
2952 | static void | |
47387409 TE |
2953 | ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, |
2954 | struct buffer_head *bh) | |
ac27a0ec | 2955 | { |
6048c64b AG |
2956 | struct ext4_xattr_header *header = BHDR(bh); |
2957 | __u32 hash = le32_to_cpu(header->h_hash); | |
2958 | int reusable = le32_to_cpu(header->h_refcount) < | |
2959 | EXT4_XATTR_REFCOUNT_MAX; | |
ac27a0ec DK |
2960 | int error; |
2961 | ||
cdb7ee4c TE |
2962 | if (!ea_block_cache) |
2963 | return; | |
47387409 | 2964 | error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, |
6048c64b | 2965 | bh->b_blocknr, reusable); |
ac27a0ec | 2966 | if (error) { |
82939d79 | 2967 | if (error == -EBUSY) |
ac27a0ec | 2968 | ea_bdebug(bh, "already in cache"); |
82939d79 | 2969 | } else |
ac27a0ec | 2970 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
2971 | } |
2972 | ||
2973 | /* | |
617ba13b | 2974 | * ext4_xattr_cmp() |
ac27a0ec DK |
2975 | * |
2976 | * Compare two extended attribute blocks for equality. | |
2977 | * | |
2978 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
2979 | * a negative error number on errors. | |
2980 | */ | |
2981 | static int | |
617ba13b MC |
2982 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
2983 | struct ext4_xattr_header *header2) | |
ac27a0ec | 2984 | { |
617ba13b | 2985 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
2986 | |
2987 | entry1 = ENTRY(header1+1); | |
2988 | entry2 = ENTRY(header2+1); | |
2989 | while (!IS_LAST_ENTRY(entry1)) { | |
2990 | if (IS_LAST_ENTRY(entry2)) | |
2991 | return 1; | |
2992 | if (entry1->e_hash != entry2->e_hash || | |
2993 | entry1->e_name_index != entry2->e_name_index || | |
2994 | entry1->e_name_len != entry2->e_name_len || | |
2995 | entry1->e_value_size != entry2->e_value_size || | |
e50e5129 | 2996 | entry1->e_value_inum != entry2->e_value_inum || |
ac27a0ec DK |
2997 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) |
2998 | return 1; | |
7cec1918 TE |
2999 | if (!entry1->e_value_inum && |
3000 | memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), | |
ac27a0ec DK |
3001 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), |
3002 | le32_to_cpu(entry1->e_value_size))) | |
3003 | return 1; | |
3004 | ||
617ba13b MC |
3005 | entry1 = EXT4_XATTR_NEXT(entry1); |
3006 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
3007 | } |
3008 | if (!IS_LAST_ENTRY(entry2)) | |
3009 | return 1; | |
3010 | return 0; | |
3011 | } | |
3012 | ||
3013 | /* | |
47387409 | 3014 | * ext4_xattr_block_cache_find() |
ac27a0ec DK |
3015 | * |
3016 | * Find an identical extended attribute block. | |
3017 | * | |
3018 | * Returns a pointer to the block found, or NULL if such a block was | |
3019 | * not found or an error occurred. | |
3020 | */ | |
3021 | static struct buffer_head * | |
47387409 TE |
3022 | ext4_xattr_block_cache_find(struct inode *inode, |
3023 | struct ext4_xattr_header *header, | |
3024 | struct mb_cache_entry **pce) | |
ac27a0ec DK |
3025 | { |
3026 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 | 3027 | struct mb_cache_entry *ce; |
47387409 | 3028 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec | 3029 | |
cdb7ee4c TE |
3030 | if (!ea_block_cache) |
3031 | return NULL; | |
ac27a0ec DK |
3032 | if (!header->h_hash) |
3033 | return NULL; /* never share */ | |
3034 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
47387409 | 3035 | ce = mb_cache_entry_find_first(ea_block_cache, hash); |
ac27a0ec DK |
3036 | while (ce) { |
3037 | struct buffer_head *bh; | |
3038 | ||
c07dfcb4 | 3039 | bh = sb_bread(inode->i_sb, ce->e_value); |
ac27a0ec | 3040 | if (!bh) { |
24676da4 | 3041 | EXT4_ERROR_INODE(inode, "block %lu read error", |
c07dfcb4 | 3042 | (unsigned long)ce->e_value); |
617ba13b | 3043 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
ac27a0ec DK |
3044 | *pce = ce; |
3045 | return bh; | |
3046 | } | |
3047 | brelse(bh); | |
47387409 | 3048 | ce = mb_cache_entry_find_next(ea_block_cache, ce); |
ac27a0ec DK |
3049 | } |
3050 | return NULL; | |
3051 | } | |
3052 | ||
3053 | #define NAME_HASH_SHIFT 5 | |
3054 | #define VALUE_HASH_SHIFT 16 | |
3055 | ||
3056 | /* | |
617ba13b | 3057 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
3058 | * |
3059 | * Compute the hash of an extended attribute. | |
3060 | */ | |
b9fc761e TE |
3061 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
3062 | size_t value_count) | |
ac27a0ec DK |
3063 | { |
3064 | __u32 hash = 0; | |
ac27a0ec | 3065 | |
b9fc761e | 3066 | while (name_len--) { |
ac27a0ec DK |
3067 | hash = (hash << NAME_HASH_SHIFT) ^ |
3068 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
3069 | *name++; | |
3070 | } | |
b9fc761e TE |
3071 | while (value_count--) { |
3072 | hash = (hash << VALUE_HASH_SHIFT) ^ | |
3073 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
3074 | le32_to_cpu(*value++); | |
ac27a0ec | 3075 | } |
b9fc761e | 3076 | return cpu_to_le32(hash); |
ac27a0ec DK |
3077 | } |
3078 | ||
3079 | #undef NAME_HASH_SHIFT | |
3080 | #undef VALUE_HASH_SHIFT | |
3081 | ||
3082 | #define BLOCK_HASH_SHIFT 16 | |
3083 | ||
3084 | /* | |
617ba13b | 3085 | * ext4_xattr_rehash() |
ac27a0ec DK |
3086 | * |
3087 | * Re-compute the extended attribute hash value after an entry has changed. | |
3088 | */ | |
daf83281 | 3089 | static void ext4_xattr_rehash(struct ext4_xattr_header *header) |
ac27a0ec | 3090 | { |
617ba13b | 3091 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
3092 | __u32 hash = 0; |
3093 | ||
ac27a0ec DK |
3094 | here = ENTRY(header+1); |
3095 | while (!IS_LAST_ENTRY(here)) { | |
3096 | if (!here->e_hash) { | |
3097 | /* Block is not shared if an entry's hash value == 0 */ | |
3098 | hash = 0; | |
3099 | break; | |
3100 | } | |
3101 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
3102 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
3103 | le32_to_cpu(here->e_hash); | |
617ba13b | 3104 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
3105 | } |
3106 | header->h_hash = cpu_to_le32(hash); | |
3107 | } | |
3108 | ||
3109 | #undef BLOCK_HASH_SHIFT | |
3110 | ||
9c191f70 M |
3111 | #define HASH_BUCKET_BITS 10 |
3112 | ||
7a2508e1 | 3113 | struct mb_cache * |
82939d79 | 3114 | ext4_xattr_create_cache(void) |
ac27a0ec | 3115 | { |
7a2508e1 | 3116 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
3117 | } |
3118 | ||
7a2508e1 | 3119 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 3120 | { |
9c191f70 | 3121 | if (cache) |
7a2508e1 | 3122 | mb_cache_destroy(cache); |
ac27a0ec | 3123 | } |
9c191f70 | 3124 |