Commit | Line | Data |
---|---|---|
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)) { |
ce3fd194 EB |
198 | u32 size = le32_to_cpu(entry->e_value_size); |
199 | ||
200 | if (size > INT_MAX) | |
201 | return -EFSCORRUPTED; | |
202 | ||
203 | if (size != 0 && entry->e_value_inum == 0) { | |
d7614cc1 | 204 | u16 offs = le16_to_cpu(entry->e_value_offs); |
d7614cc1 EB |
205 | void *value; |
206 | ||
207 | /* | |
208 | * The value cannot overlap the names, and the value | |
209 | * with padding cannot extend beyond 'end'. Check both | |
210 | * the padded and unpadded sizes, since the size may | |
211 | * overflow to 0 when adding padding. | |
212 | */ | |
213 | if (offs > end - value_start) | |
214 | return -EFSCORRUPTED; | |
215 | value = value_start + offs; | |
216 | if (value < (void *)e + sizeof(u32) || | |
217 | size > end - value || | |
218 | EXT4_XATTR_SIZE(size) > end - value) | |
219 | return -EFSCORRUPTED; | |
220 | } | |
a0626e75 DW |
221 | entry = EXT4_XATTR_NEXT(entry); |
222 | } | |
223 | ||
ac27a0ec DK |
224 | return 0; |
225 | } | |
226 | ||
227 | static inline int | |
de05ca85 TT |
228 | __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh, |
229 | const char *function, unsigned int line) | |
ac27a0ec | 230 | { |
de05ca85 | 231 | int error = -EFSCORRUPTED; |
cc8e94fd DW |
232 | |
233 | if (buffer_verified(bh)) | |
234 | return 0; | |
235 | ||
617ba13b | 236 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 237 | BHDR(bh)->h_blocks != cpu_to_le32(1)) |
de05ca85 TT |
238 | goto errout; |
239 | error = -EFSBADCRC; | |
dac7a4b4 | 240 | if (!ext4_xattr_block_csum_verify(inode, bh)) |
de05ca85 | 241 | goto errout; |
2c4f9923 EB |
242 | error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, |
243 | bh->b_data); | |
de05ca85 TT |
244 | errout: |
245 | if (error) | |
246 | __ext4_error_inode(inode, function, line, 0, | |
247 | "corrupted xattr block %llu", | |
248 | (unsigned long long) bh->b_blocknr); | |
249 | else | |
cc8e94fd DW |
250 | set_buffer_verified(bh); |
251 | return error; | |
ac27a0ec DK |
252 | } |
253 | ||
de05ca85 TT |
254 | #define ext4_xattr_check_block(inode, bh) \ |
255 | __ext4_xattr_check_block((inode), (bh), __func__, __LINE__) | |
256 | ||
257 | ||
9e92f48c TT |
258 | static int |
259 | __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, | |
260 | void *end, const char *function, unsigned int line) | |
261 | { | |
9e92f48c TT |
262 | int error = -EFSCORRUPTED; |
263 | ||
290ab230 | 264 | if (end - (void *)header < sizeof(*header) + sizeof(u32) || |
19962509 | 265 | (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) |
9e92f48c | 266 | goto errout; |
2c4f9923 | 267 | error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); |
9e92f48c TT |
268 | errout: |
269 | if (error) | |
270 | __ext4_error_inode(inode, function, line, 0, | |
271 | "corrupted in-inode xattr"); | |
272 | return error; | |
273 | } | |
274 | ||
275 | #define xattr_check_inode(inode, header, end) \ | |
276 | __xattr_check_inode((inode), (header), (end), __func__, __LINE__) | |
277 | ||
ac27a0ec | 278 | static int |
9496005d TT |
279 | xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry, |
280 | void *end, int name_index, const char *name, int sorted) | |
ac27a0ec | 281 | { |
9496005d | 282 | struct ext4_xattr_entry *entry, *next; |
ac27a0ec DK |
283 | size_t name_len; |
284 | int cmp = 1; | |
285 | ||
286 | if (name == NULL) | |
287 | return -EINVAL; | |
288 | name_len = strlen(name); | |
9496005d TT |
289 | for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) { |
290 | next = EXT4_XATTR_NEXT(entry); | |
291 | if ((void *) next >= end) { | |
292 | EXT4_ERROR_INODE(inode, "corrupted xattr entries"); | |
293 | return -EFSCORRUPTED; | |
294 | } | |
ac27a0ec DK |
295 | cmp = name_index - entry->e_name_index; |
296 | if (!cmp) | |
297 | cmp = name_len - entry->e_name_len; | |
298 | if (!cmp) | |
299 | cmp = memcmp(name, entry->e_name, name_len); | |
300 | if (cmp <= 0 && (sorted || cmp == 0)) | |
301 | break; | |
302 | } | |
303 | *pentry = entry; | |
ac27a0ec DK |
304 | return cmp ? -ENODATA : 0; |
305 | } | |
306 | ||
dec214d0 TE |
307 | static u32 |
308 | ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) | |
309 | { | |
310 | return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); | |
311 | } | |
312 | ||
313 | static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) | |
314 | { | |
315 | return ((u64)ea_inode->i_ctime.tv_sec << 32) | | |
ee73f9a5 | 316 | (u32) inode_peek_iversion_raw(ea_inode); |
dec214d0 TE |
317 | } |
318 | ||
319 | static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) | |
320 | { | |
321 | ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); | |
ee73f9a5 | 322 | inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); |
dec214d0 TE |
323 | } |
324 | ||
325 | static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) | |
326 | { | |
327 | return (u32)ea_inode->i_atime.tv_sec; | |
328 | } | |
329 | ||
330 | static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) | |
331 | { | |
332 | ea_inode->i_atime.tv_sec = hash; | |
333 | } | |
334 | ||
e50e5129 AD |
335 | /* |
336 | * Read the EA value from an inode. | |
337 | */ | |
90966693 | 338 | static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) |
e50e5129 | 339 | { |
9699d4f9 TE |
340 | int blocksize = 1 << ea_inode->i_blkbits; |
341 | int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; | |
342 | int tail_size = (size % blocksize) ?: blocksize; | |
343 | struct buffer_head *bhs_inline[8]; | |
344 | struct buffer_head **bhs = bhs_inline; | |
345 | int i, ret; | |
346 | ||
347 | if (bh_count > ARRAY_SIZE(bhs_inline)) { | |
348 | bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); | |
349 | if (!bhs) | |
350 | return -ENOMEM; | |
351 | } | |
90966693 | 352 | |
9699d4f9 TE |
353 | ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, |
354 | true /* wait */, bhs); | |
355 | if (ret) | |
356 | goto free_bhs; | |
e50e5129 | 357 | |
9699d4f9 TE |
358 | for (i = 0; i < bh_count; i++) { |
359 | /* There shouldn't be any holes in ea_inode. */ | |
360 | if (!bhs[i]) { | |
361 | ret = -EFSCORRUPTED; | |
362 | goto put_bhs; | |
363 | } | |
364 | memcpy((char *)buf + blocksize * i, bhs[i]->b_data, | |
365 | i < bh_count - 1 ? blocksize : tail_size); | |
e50e5129 | 366 | } |
9699d4f9 TE |
367 | ret = 0; |
368 | put_bhs: | |
369 | for (i = 0; i < bh_count; i++) | |
370 | brelse(bhs[i]); | |
371 | free_bhs: | |
372 | if (bhs != bhs_inline) | |
373 | kfree(bhs); | |
374 | return ret; | |
e50e5129 AD |
375 | } |
376 | ||
a6d05676 TE |
377 | #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) |
378 | ||
bab79b04 | 379 | static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, |
a6d05676 | 380 | u32 ea_inode_hash, struct inode **ea_inode) |
e50e5129 | 381 | { |
bab79b04 TE |
382 | struct inode *inode; |
383 | int err; | |
e50e5129 | 384 | |
bab79b04 TE |
385 | inode = ext4_iget(parent->i_sb, ea_ino); |
386 | if (IS_ERR(inode)) { | |
387 | err = PTR_ERR(inode); | |
dec214d0 TE |
388 | ext4_error(parent->i_sb, |
389 | "error while reading EA inode %lu err=%d", ea_ino, | |
390 | err); | |
bab79b04 | 391 | return err; |
e50e5129 AD |
392 | } |
393 | ||
bab79b04 | 394 | if (is_bad_inode(inode)) { |
dec214d0 TE |
395 | ext4_error(parent->i_sb, |
396 | "error while reading EA inode %lu is_bad_inode", | |
397 | ea_ino); | |
bab79b04 TE |
398 | err = -EIO; |
399 | goto error; | |
400 | } | |
401 | ||
bab79b04 | 402 | if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { |
dec214d0 TE |
403 | ext4_error(parent->i_sb, |
404 | "EA inode %lu does not have EXT4_EA_INODE_FL flag", | |
405 | ea_ino); | |
bab79b04 | 406 | err = -EINVAL; |
e50e5129 AD |
407 | goto error; |
408 | } | |
409 | ||
a6d05676 TE |
410 | ext4_xattr_inode_set_class(inode); |
411 | ||
412 | /* | |
413 | * Check whether this is an old Lustre-style xattr inode. Lustre | |
414 | * implementation does not have hash validation, rather it has a | |
415 | * backpointer from ea_inode to the parent inode. | |
416 | */ | |
417 | if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && | |
418 | EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && | |
419 | inode->i_generation == parent->i_generation) { | |
420 | ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); | |
421 | ext4_xattr_inode_set_ref(inode, 1); | |
422 | } else { | |
423 | inode_lock(inode); | |
424 | inode->i_flags |= S_NOQUOTA; | |
425 | inode_unlock(inode); | |
426 | } | |
427 | ||
bab79b04 TE |
428 | *ea_inode = inode; |
429 | return 0; | |
e50e5129 | 430 | error: |
bab79b04 TE |
431 | iput(inode); |
432 | return err; | |
e50e5129 AD |
433 | } |
434 | ||
dec214d0 | 435 | static int |
b9fc761e TE |
436 | ext4_xattr_inode_verify_hashes(struct inode *ea_inode, |
437 | struct ext4_xattr_entry *entry, void *buffer, | |
438 | size_t size) | |
dec214d0 TE |
439 | { |
440 | u32 hash; | |
441 | ||
442 | /* Verify stored hash matches calculated hash. */ | |
443 | hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); | |
444 | if (hash != ext4_xattr_inode_get_hash(ea_inode)) | |
445 | return -EFSCORRUPTED; | |
b9fc761e TE |
446 | |
447 | if (entry) { | |
448 | __le32 e_hash, tmp_data; | |
449 | ||
450 | /* Verify entry hash. */ | |
451 | tmp_data = cpu_to_le32(hash); | |
452 | e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, | |
453 | &tmp_data, 1); | |
454 | if (e_hash != entry->e_hash) | |
455 | return -EFSCORRUPTED; | |
456 | } | |
dec214d0 TE |
457 | return 0; |
458 | } | |
459 | ||
e50e5129 | 460 | /* |
b9fc761e | 461 | * Read xattr value from the EA inode. |
e50e5129 AD |
462 | */ |
463 | static int | |
b9fc761e TE |
464 | ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, |
465 | void *buffer, size_t size) | |
e50e5129 | 466 | { |
dec214d0 | 467 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); |
bab79b04 | 468 | struct inode *ea_inode; |
dec214d0 | 469 | int err; |
e50e5129 | 470 | |
b9fc761e | 471 | err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), |
a6d05676 | 472 | le32_to_cpu(entry->e_hash), &ea_inode); |
dec214d0 TE |
473 | if (err) { |
474 | ea_inode = NULL; | |
475 | goto out; | |
476 | } | |
e50e5129 | 477 | |
dec214d0 TE |
478 | if (i_size_read(ea_inode) != size) { |
479 | ext4_warning_inode(ea_inode, | |
480 | "ea_inode file size=%llu entry size=%zu", | |
481 | i_size_read(ea_inode), size); | |
482 | err = -EFSCORRUPTED; | |
483 | goto out; | |
484 | } | |
e50e5129 | 485 | |
dec214d0 TE |
486 | err = ext4_xattr_inode_read(ea_inode, buffer, size); |
487 | if (err) | |
488 | goto out; | |
489 | ||
a6d05676 TE |
490 | if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { |
491 | err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, | |
492 | size); | |
493 | if (err) { | |
dec214d0 TE |
494 | ext4_warning_inode(ea_inode, |
495 | "EA inode hash validation failed"); | |
496 | goto out; | |
497 | } | |
dec214d0 | 498 | |
a6d05676 TE |
499 | if (ea_inode_cache) |
500 | mb_cache_entry_create(ea_inode_cache, GFP_NOFS, | |
501 | ext4_xattr_inode_get_hash(ea_inode), | |
502 | ea_inode->i_ino, true /* reusable */); | |
503 | } | |
dec214d0 TE |
504 | out: |
505 | iput(ea_inode); | |
506 | return err; | |
e50e5129 AD |
507 | } |
508 | ||
ac27a0ec | 509 | static int |
617ba13b | 510 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
511 | void *buffer, size_t buffer_size) |
512 | { | |
513 | struct buffer_head *bh = NULL; | |
617ba13b | 514 | struct ext4_xattr_entry *entry; |
ac27a0ec | 515 | size_t size; |
9496005d | 516 | void *end; |
ac27a0ec | 517 | int error; |
47387409 | 518 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec DK |
519 | |
520 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
521 | name_index, name, buffer, (long)buffer_size); | |
522 | ||
523 | error = -ENODATA; | |
617ba13b | 524 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 525 | goto cleanup; |
ace36ad4 JP |
526 | ea_idebug(inode, "reading block %llu", |
527 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 528 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
529 | if (!bh) |
530 | goto cleanup; | |
531 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
532 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
de05ca85 TT |
533 | error = ext4_xattr_check_block(inode, bh); |
534 | if (error) | |
ac27a0ec | 535 | goto cleanup; |
47387409 | 536 | ext4_xattr_block_cache_insert(ea_block_cache, bh); |
ac27a0ec | 537 | entry = BFIRST(bh); |
9496005d TT |
538 | end = bh->b_data + bh->b_size; |
539 | error = xattr_find_entry(inode, &entry, end, name_index, name, 1); | |
ac27a0ec DK |
540 | if (error) |
541 | goto cleanup; | |
542 | size = le32_to_cpu(entry->e_value_size); | |
543 | if (buffer) { | |
544 | error = -ERANGE; | |
545 | if (size > buffer_size) | |
546 | goto cleanup; | |
e50e5129 | 547 | if (entry->e_value_inum) { |
b9fc761e TE |
548 | error = ext4_xattr_inode_get(inode, entry, buffer, |
549 | size); | |
e50e5129 AD |
550 | if (error) |
551 | goto cleanup; | |
552 | } else { | |
553 | memcpy(buffer, bh->b_data + | |
554 | le16_to_cpu(entry->e_value_offs), size); | |
555 | } | |
ac27a0ec DK |
556 | } |
557 | error = size; | |
558 | ||
559 | cleanup: | |
560 | brelse(bh); | |
561 | return error; | |
562 | } | |
563 | ||
879b3825 | 564 | int |
617ba13b | 565 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
566 | void *buffer, size_t buffer_size) |
567 | { | |
617ba13b MC |
568 | struct ext4_xattr_ibody_header *header; |
569 | struct ext4_xattr_entry *entry; | |
570 | struct ext4_inode *raw_inode; | |
571 | struct ext4_iloc iloc; | |
ac27a0ec DK |
572 | size_t size; |
573 | void *end; | |
574 | int error; | |
575 | ||
19f5fb7a | 576 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 577 | return -ENODATA; |
617ba13b | 578 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
579 | if (error) |
580 | return error; | |
617ba13b | 581 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 582 | header = IHDR(inode, raw_inode); |
617ba13b | 583 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 584 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
585 | if (error) |
586 | goto cleanup; | |
6ba644b9 | 587 | entry = IFIRST(header); |
9496005d | 588 | error = xattr_find_entry(inode, &entry, end, name_index, name, 0); |
ac27a0ec DK |
589 | if (error) |
590 | goto cleanup; | |
591 | size = le32_to_cpu(entry->e_value_size); | |
592 | if (buffer) { | |
593 | error = -ERANGE; | |
594 | if (size > buffer_size) | |
595 | goto cleanup; | |
e50e5129 | 596 | if (entry->e_value_inum) { |
b9fc761e TE |
597 | error = ext4_xattr_inode_get(inode, entry, buffer, |
598 | size); | |
e50e5129 AD |
599 | if (error) |
600 | goto cleanup; | |
601 | } else { | |
602 | memcpy(buffer, (void *)IFIRST(header) + | |
603 | le16_to_cpu(entry->e_value_offs), size); | |
604 | } | |
ac27a0ec DK |
605 | } |
606 | error = size; | |
607 | ||
608 | cleanup: | |
609 | brelse(iloc.bh); | |
610 | return error; | |
611 | } | |
612 | ||
613 | /* | |
617ba13b | 614 | * ext4_xattr_get() |
ac27a0ec DK |
615 | * |
616 | * Copy an extended attribute into the buffer | |
617 | * provided, or compute the buffer size required. | |
618 | * Buffer is NULL to compute the size of the buffer required. | |
619 | * | |
620 | * Returns a negative error number on failure, or the number of bytes | |
621 | * used / required on success. | |
622 | */ | |
623 | int | |
617ba13b | 624 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
625 | void *buffer, size_t buffer_size) |
626 | { | |
627 | int error; | |
628 | ||
0db1ff22 TT |
629 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
630 | return -EIO; | |
631 | ||
230b8c1a ZZ |
632 | if (strlen(name) > 255) |
633 | return -ERANGE; | |
634 | ||
617ba13b MC |
635 | down_read(&EXT4_I(inode)->xattr_sem); |
636 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
637 | buffer_size); |
638 | if (error == -ENODATA) | |
617ba13b | 639 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 640 | buffer_size); |
617ba13b | 641 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
642 | return error; |
643 | } | |
644 | ||
645 | static int | |
431547b3 | 646 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
647 | char *buffer, size_t buffer_size) |
648 | { | |
649 | size_t rest = buffer_size; | |
650 | ||
617ba13b | 651 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 652 | const struct xattr_handler *handler = |
617ba13b | 653 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec | 654 | |
764a5c6b AG |
655 | if (handler && (!handler->list || handler->list(dentry))) { |
656 | const char *prefix = handler->prefix ?: handler->name; | |
657 | size_t prefix_len = strlen(prefix); | |
658 | size_t size = prefix_len + entry->e_name_len + 1; | |
659 | ||
ac27a0ec DK |
660 | if (buffer) { |
661 | if (size > rest) | |
662 | return -ERANGE; | |
764a5c6b AG |
663 | memcpy(buffer, prefix, prefix_len); |
664 | buffer += prefix_len; | |
665 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
666 | buffer += entry->e_name_len; | |
667 | *buffer++ = 0; | |
ac27a0ec DK |
668 | } |
669 | rest -= size; | |
670 | } | |
671 | } | |
764a5c6b | 672 | return buffer_size - rest; /* total size */ |
ac27a0ec DK |
673 | } |
674 | ||
675 | static int | |
431547b3 | 676 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 677 | { |
2b0143b5 | 678 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
679 | struct buffer_head *bh = NULL; |
680 | int error; | |
681 | ||
682 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
683 | buffer, (long)buffer_size); | |
684 | ||
685 | error = 0; | |
617ba13b | 686 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 687 | goto cleanup; |
ace36ad4 JP |
688 | ea_idebug(inode, "reading block %llu", |
689 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 690 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
691 | error = -EIO; |
692 | if (!bh) | |
693 | goto cleanup; | |
694 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
695 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
de05ca85 TT |
696 | error = ext4_xattr_check_block(inode, bh); |
697 | if (error) | |
ac27a0ec | 698 | goto cleanup; |
47387409 | 699 | ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); |
431547b3 | 700 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); |
ac27a0ec DK |
701 | |
702 | cleanup: | |
703 | brelse(bh); | |
704 | ||
705 | return error; | |
706 | } | |
707 | ||
708 | static int | |
431547b3 | 709 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 710 | { |
2b0143b5 | 711 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
712 | struct ext4_xattr_ibody_header *header; |
713 | struct ext4_inode *raw_inode; | |
714 | struct ext4_iloc iloc; | |
ac27a0ec DK |
715 | void *end; |
716 | int error; | |
717 | ||
19f5fb7a | 718 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 719 | return 0; |
617ba13b | 720 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
721 | if (error) |
722 | return error; | |
617ba13b | 723 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 724 | header = IHDR(inode, raw_inode); |
617ba13b | 725 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 726 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
727 | if (error) |
728 | goto cleanup; | |
431547b3 | 729 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
730 | buffer, buffer_size); |
731 | ||
732 | cleanup: | |
733 | brelse(iloc.bh); | |
734 | return error; | |
735 | } | |
736 | ||
737 | /* | |
ba7ea1d8 EB |
738 | * Inode operation listxattr() |
739 | * | |
740 | * d_inode(dentry)->i_rwsem: don't care | |
ac27a0ec DK |
741 | * |
742 | * Copy a list of attribute names into the buffer | |
743 | * provided, or compute the buffer size required. | |
744 | * Buffer is NULL to compute the size of the buffer required. | |
745 | * | |
746 | * Returns a negative error number on failure, or the number of bytes | |
747 | * used / required on success. | |
748 | */ | |
ba7ea1d8 EB |
749 | ssize_t |
750 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
ac27a0ec | 751 | { |
eaeef867 | 752 | int ret, ret2; |
ac27a0ec | 753 | |
2b0143b5 | 754 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
755 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
756 | if (ret < 0) | |
757 | goto errout; | |
758 | if (buffer) { | |
759 | buffer += ret; | |
760 | buffer_size -= ret; | |
ac27a0ec | 761 | } |
eaeef867 TT |
762 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
763 | if (ret < 0) | |
764 | goto errout; | |
765 | ret += ret2; | |
766 | errout: | |
2b0143b5 | 767 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 768 | return ret; |
ac27a0ec DK |
769 | } |
770 | ||
771 | /* | |
617ba13b | 772 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
773 | * not set, set it. |
774 | */ | |
617ba13b | 775 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
776 | struct super_block *sb) |
777 | { | |
e2b911c5 | 778 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
779 | return; |
780 | ||
5d601255 | 781 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 782 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
e2b911c5 | 783 | ext4_set_feature_xattr(sb); |
a0375156 | 784 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec | 785 | } |
ac27a0ec DK |
786 | } |
787 | ||
7a9ca53a TE |
788 | int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) |
789 | { | |
790 | struct ext4_iloc iloc = { .bh = NULL }; | |
791 | struct buffer_head *bh = NULL; | |
792 | struct ext4_inode *raw_inode; | |
793 | struct ext4_xattr_ibody_header *header; | |
794 | struct ext4_xattr_entry *entry; | |
795 | qsize_t ea_inode_refs = 0; | |
796 | void *end; | |
797 | int ret; | |
798 | ||
799 | lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); | |
800 | ||
801 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
802 | ret = ext4_get_inode_loc(inode, &iloc); | |
803 | if (ret) | |
804 | goto out; | |
805 | raw_inode = ext4_raw_inode(&iloc); | |
806 | header = IHDR(inode, raw_inode); | |
807 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
808 | ret = xattr_check_inode(inode, header, end); | |
809 | if (ret) | |
810 | goto out; | |
811 | ||
812 | for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); | |
813 | entry = EXT4_XATTR_NEXT(entry)) | |
814 | if (entry->e_value_inum) | |
815 | ea_inode_refs++; | |
816 | } | |
817 | ||
818 | if (EXT4_I(inode)->i_file_acl) { | |
819 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
820 | if (!bh) { | |
821 | ret = -EIO; | |
822 | goto out; | |
823 | } | |
824 | ||
de05ca85 TT |
825 | ret = ext4_xattr_check_block(inode, bh); |
826 | if (ret) | |
7a9ca53a | 827 | goto out; |
7a9ca53a TE |
828 | |
829 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
830 | entry = EXT4_XATTR_NEXT(entry)) | |
831 | if (entry->e_value_inum) | |
832 | ea_inode_refs++; | |
833 | } | |
834 | *usage = ea_inode_refs + 1; | |
835 | ret = 0; | |
836 | out: | |
837 | brelse(iloc.bh); | |
838 | brelse(bh); | |
839 | return ret; | |
840 | } | |
841 | ||
dec214d0 TE |
842 | static inline size_t round_up_cluster(struct inode *inode, size_t length) |
843 | { | |
844 | struct super_block *sb = inode->i_sb; | |
845 | size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + | |
846 | inode->i_blkbits); | |
847 | size_t mask = ~(cluster_size - 1); | |
848 | ||
849 | return (length + cluster_size - 1) & mask; | |
850 | } | |
851 | ||
852 | static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) | |
853 | { | |
854 | int err; | |
855 | ||
856 | err = dquot_alloc_inode(inode); | |
857 | if (err) | |
858 | return err; | |
859 | err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); | |
860 | if (err) | |
861 | dquot_free_inode(inode); | |
862 | return err; | |
863 | } | |
864 | ||
a6d05676 TE |
865 | static void ext4_xattr_inode_free_quota(struct inode *parent, |
866 | struct inode *ea_inode, | |
867 | size_t len) | |
dec214d0 | 868 | { |
a6d05676 TE |
869 | if (ea_inode && |
870 | ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) | |
871 | return; | |
872 | dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); | |
873 | dquot_free_inode(parent); | |
dec214d0 TE |
874 | } |
875 | ||
af65207c TE |
876 | int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, |
877 | struct buffer_head *block_bh, size_t value_len, | |
878 | bool is_create) | |
dec214d0 | 879 | { |
dec214d0 TE |
880 | int credits; |
881 | int blocks; | |
882 | ||
883 | /* | |
884 | * 1) Owner inode update | |
885 | * 2) Ref count update on old xattr block | |
886 | * 3) new xattr block | |
887 | * 4) block bitmap update for new xattr block | |
888 | * 5) group descriptor for new xattr block | |
889 | * 6) block bitmap update for old xattr block | |
890 | * 7) group descriptor for old block | |
891 | * | |
892 | * 6 & 7 can happen if we have two racing threads T_a and T_b | |
893 | * which are each trying to set an xattr on inodes I_a and I_b | |
894 | * which were both initially sharing an xattr block. | |
895 | */ | |
896 | credits = 7; | |
897 | ||
898 | /* Quota updates. */ | |
899 | credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); | |
900 | ||
901 | /* | |
902 | * In case of inline data, we may push out the data to a block, | |
903 | * so we need to reserve credits for this eventuality | |
904 | */ | |
af65207c | 905 | if (inode && ext4_has_inline_data(inode)) |
dec214d0 TE |
906 | credits += ext4_writepage_trans_blocks(inode) + 1; |
907 | ||
908 | /* We are done if ea_inode feature is not enabled. */ | |
909 | if (!ext4_has_feature_ea_inode(sb)) | |
910 | return credits; | |
911 | ||
912 | /* New ea_inode, inode map, block bitmap, group descriptor. */ | |
913 | credits += 4; | |
914 | ||
915 | /* Data blocks. */ | |
916 | blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; | |
917 | ||
918 | /* Indirection block or one level of extent tree. */ | |
919 | blocks += 1; | |
920 | ||
921 | /* Block bitmap and group descriptor updates for each block. */ | |
922 | credits += blocks * 2; | |
923 | ||
924 | /* Blocks themselves. */ | |
925 | credits += blocks; | |
926 | ||
af65207c TE |
927 | if (!is_create) { |
928 | /* Dereference ea_inode holding old xattr value. | |
929 | * Old ea_inode, inode map, block bitmap, group descriptor. | |
930 | */ | |
931 | credits += 4; | |
dec214d0 | 932 | |
af65207c TE |
933 | /* Data blocks for old ea_inode. */ |
934 | blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; | |
dec214d0 | 935 | |
af65207c TE |
936 | /* Indirection block or one level of extent tree for old |
937 | * ea_inode. | |
938 | */ | |
939 | blocks += 1; | |
dec214d0 | 940 | |
af65207c TE |
941 | /* Block bitmap and group descriptor updates for each block. */ |
942 | credits += blocks * 2; | |
943 | } | |
dec214d0 TE |
944 | |
945 | /* We may need to clone the existing xattr block in which case we need | |
946 | * to increment ref counts for existing ea_inodes referenced by it. | |
947 | */ | |
948 | if (block_bh) { | |
949 | struct ext4_xattr_entry *entry = BFIRST(block_bh); | |
950 | ||
951 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) | |
952 | if (entry->e_value_inum) | |
953 | /* Ref count update on ea_inode. */ | |
954 | credits += 1; | |
955 | } | |
956 | return credits; | |
957 | } | |
958 | ||
30a7eb97 TE |
959 | static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode, |
960 | int credits, struct buffer_head *bh, | |
961 | bool dirty, bool block_csum) | |
962 | { | |
963 | int error; | |
964 | ||
965 | if (!ext4_handle_valid(handle)) | |
966 | return 0; | |
967 | ||
968 | if (handle->h_buffer_credits >= credits) | |
969 | return 0; | |
970 | ||
971 | error = ext4_journal_extend(handle, credits - handle->h_buffer_credits); | |
972 | if (!error) | |
973 | return 0; | |
974 | if (error < 0) { | |
975 | ext4_warning(inode->i_sb, "Extend journal (error %d)", error); | |
976 | return error; | |
977 | } | |
978 | ||
979 | if (bh && dirty) { | |
980 | if (block_csum) | |
981 | ext4_xattr_block_csum_set(inode, bh); | |
982 | error = ext4_handle_dirty_metadata(handle, NULL, bh); | |
983 | if (error) { | |
984 | ext4_warning(inode->i_sb, "Handle metadata (error %d)", | |
985 | error); | |
986 | return error; | |
987 | } | |
988 | } | |
989 | ||
990 | error = ext4_journal_restart(handle, credits); | |
991 | if (error) { | |
992 | ext4_warning(inode->i_sb, "Restart journal (error %d)", error); | |
993 | return error; | |
994 | } | |
995 | ||
996 | if (bh) { | |
997 | error = ext4_journal_get_write_access(handle, bh); | |
998 | if (error) { | |
999 | ext4_warning(inode->i_sb, | |
1000 | "Get write access failed (error %d)", | |
1001 | error); | |
1002 | return error; | |
1003 | } | |
1004 | } | |
1005 | return 0; | |
1006 | } | |
1007 | ||
dec214d0 TE |
1008 | static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, |
1009 | int ref_change) | |
1010 | { | |
1011 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); | |
1012 | struct ext4_iloc iloc; | |
1013 | s64 ref_count; | |
1014 | u32 hash; | |
1015 | int ret; | |
1016 | ||
1017 | inode_lock(ea_inode); | |
1018 | ||
1019 | ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); | |
1020 | if (ret) { | |
1021 | iloc.bh = NULL; | |
1022 | goto out; | |
1023 | } | |
1024 | ||
1025 | ref_count = ext4_xattr_inode_get_ref(ea_inode); | |
1026 | ref_count += ref_change; | |
1027 | ext4_xattr_inode_set_ref(ea_inode, ref_count); | |
1028 | ||
1029 | if (ref_change > 0) { | |
1030 | WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", | |
1031 | ea_inode->i_ino, ref_count); | |
1032 | ||
1033 | if (ref_count == 1) { | |
1034 | WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", | |
1035 | ea_inode->i_ino, ea_inode->i_nlink); | |
1036 | ||
1037 | set_nlink(ea_inode, 1); | |
1038 | ext4_orphan_del(handle, ea_inode); | |
1039 | ||
cdb7ee4c TE |
1040 | if (ea_inode_cache) { |
1041 | hash = ext4_xattr_inode_get_hash(ea_inode); | |
1042 | mb_cache_entry_create(ea_inode_cache, | |
1043 | GFP_NOFS, hash, | |
1044 | ea_inode->i_ino, | |
1045 | true /* reusable */); | |
1046 | } | |
dec214d0 TE |
1047 | } |
1048 | } else { | |
1049 | WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", | |
1050 | ea_inode->i_ino, ref_count); | |
1051 | ||
1052 | if (ref_count == 0) { | |
1053 | WARN_ONCE(ea_inode->i_nlink != 1, | |
1054 | "EA inode %lu i_nlink=%u", | |
1055 | ea_inode->i_ino, ea_inode->i_nlink); | |
1056 | ||
1057 | clear_nlink(ea_inode); | |
1058 | ext4_orphan_add(handle, ea_inode); | |
1059 | ||
cdb7ee4c TE |
1060 | if (ea_inode_cache) { |
1061 | hash = ext4_xattr_inode_get_hash(ea_inode); | |
1062 | mb_cache_entry_delete(ea_inode_cache, hash, | |
1063 | ea_inode->i_ino); | |
1064 | } | |
dec214d0 TE |
1065 | } |
1066 | } | |
1067 | ||
1068 | ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); | |
1069 | iloc.bh = NULL; | |
1070 | if (ret) | |
1071 | ext4_warning_inode(ea_inode, | |
1072 | "ext4_mark_iloc_dirty() failed ret=%d", ret); | |
1073 | out: | |
1074 | brelse(iloc.bh); | |
1075 | inode_unlock(ea_inode); | |
1076 | return ret; | |
1077 | } | |
1078 | ||
1079 | static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) | |
1080 | { | |
1081 | return ext4_xattr_inode_update_ref(handle, ea_inode, 1); | |
1082 | } | |
1083 | ||
1084 | static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) | |
1085 | { | |
1086 | return ext4_xattr_inode_update_ref(handle, ea_inode, -1); | |
1087 | } | |
1088 | ||
1089 | static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, | |
1090 | struct ext4_xattr_entry *first) | |
1091 | { | |
1092 | struct inode *ea_inode; | |
1093 | struct ext4_xattr_entry *entry; | |
1094 | struct ext4_xattr_entry *failed_entry; | |
1095 | unsigned int ea_ino; | |
1096 | int err, saved_err; | |
1097 | ||
1098 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1099 | entry = EXT4_XATTR_NEXT(entry)) { | |
1100 | if (!entry->e_value_inum) | |
1101 | continue; | |
1102 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1103 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1104 | le32_to_cpu(entry->e_hash), | |
1105 | &ea_inode); | |
dec214d0 TE |
1106 | if (err) |
1107 | goto cleanup; | |
1108 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1109 | if (err) { | |
1110 | ext4_warning_inode(ea_inode, "inc ref error %d", err); | |
1111 | iput(ea_inode); | |
1112 | goto cleanup; | |
1113 | } | |
1114 | iput(ea_inode); | |
1115 | } | |
1116 | return 0; | |
1117 | ||
1118 | cleanup: | |
1119 | saved_err = err; | |
1120 | failed_entry = entry; | |
1121 | ||
1122 | for (entry = first; entry != failed_entry; | |
1123 | entry = EXT4_XATTR_NEXT(entry)) { | |
1124 | if (!entry->e_value_inum) | |
1125 | continue; | |
1126 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1127 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1128 | le32_to_cpu(entry->e_hash), | |
1129 | &ea_inode); | |
dec214d0 TE |
1130 | if (err) { |
1131 | ext4_warning(parent->i_sb, | |
1132 | "cleanup ea_ino %u iget error %d", ea_ino, | |
1133 | err); | |
1134 | continue; | |
1135 | } | |
1136 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1137 | if (err) | |
1138 | ext4_warning_inode(ea_inode, "cleanup dec ref error %d", | |
1139 | err); | |
1140 | iput(ea_inode); | |
1141 | } | |
1142 | return saved_err; | |
1143 | } | |
1144 | ||
30a7eb97 | 1145 | static void |
dec214d0 TE |
1146 | ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, |
1147 | struct buffer_head *bh, | |
1148 | struct ext4_xattr_entry *first, bool block_csum, | |
1149 | struct ext4_xattr_inode_array **ea_inode_array, | |
1150 | int extra_credits, bool skip_quota) | |
30a7eb97 TE |
1151 | { |
1152 | struct inode *ea_inode; | |
1153 | struct ext4_xattr_entry *entry; | |
1154 | bool dirty = false; | |
1155 | unsigned int ea_ino; | |
1156 | int err; | |
1157 | int credits; | |
1158 | ||
1159 | /* One credit for dec ref on ea_inode, one for orphan list addition, */ | |
1160 | credits = 2 + extra_credits; | |
1161 | ||
1162 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1163 | entry = EXT4_XATTR_NEXT(entry)) { | |
1164 | if (!entry->e_value_inum) | |
1165 | continue; | |
1166 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1167 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1168 | le32_to_cpu(entry->e_hash), | |
1169 | &ea_inode); | |
30a7eb97 TE |
1170 | if (err) |
1171 | continue; | |
1172 | ||
1173 | err = ext4_expand_inode_array(ea_inode_array, ea_inode); | |
1174 | if (err) { | |
1175 | ext4_warning_inode(ea_inode, | |
1176 | "Expand inode array err=%d", err); | |
1177 | iput(ea_inode); | |
1178 | continue; | |
1179 | } | |
1180 | ||
1181 | err = ext4_xattr_ensure_credits(handle, parent, credits, bh, | |
1182 | dirty, block_csum); | |
1183 | if (err) { | |
1184 | ext4_warning_inode(ea_inode, "Ensure credits err=%d", | |
1185 | err); | |
1186 | continue; | |
1187 | } | |
1188 | ||
dec214d0 TE |
1189 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); |
1190 | if (err) { | |
1191 | ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", | |
1192 | err); | |
1193 | continue; | |
1194 | } | |
1195 | ||
1196 | if (!skip_quota) | |
a6d05676 | 1197 | ext4_xattr_inode_free_quota(parent, ea_inode, |
dec214d0 | 1198 | le32_to_cpu(entry->e_value_size)); |
30a7eb97 TE |
1199 | |
1200 | /* | |
1201 | * Forget about ea_inode within the same transaction that | |
1202 | * decrements the ref count. This avoids duplicate decrements in | |
1203 | * case the rest of the work spills over to subsequent | |
1204 | * transactions. | |
1205 | */ | |
1206 | entry->e_value_inum = 0; | |
1207 | entry->e_value_size = 0; | |
1208 | ||
1209 | dirty = true; | |
1210 | } | |
1211 | ||
1212 | if (dirty) { | |
1213 | /* | |
1214 | * Note that we are deliberately skipping csum calculation for | |
1215 | * the final update because we do not expect any journal | |
1216 | * restarts until xattr block is freed. | |
1217 | */ | |
1218 | ||
1219 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
1220 | if (err) | |
1221 | ext4_warning_inode(parent, | |
1222 | "handle dirty metadata err=%d", err); | |
1223 | } | |
1224 | } | |
1225 | ||
ac27a0ec | 1226 | /* |
ec4cb1aa JK |
1227 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
1228 | * otherwise free the block. | |
ac27a0ec DK |
1229 | */ |
1230 | static void | |
617ba13b | 1231 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
dec214d0 TE |
1232 | struct buffer_head *bh, |
1233 | struct ext4_xattr_inode_array **ea_inode_array, | |
1234 | int extra_credits) | |
ac27a0ec | 1235 | { |
47387409 | 1236 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
6048c64b | 1237 | u32 hash, ref; |
8a2bfdcb | 1238 | int error = 0; |
ac27a0ec | 1239 | |
5d601255 | 1240 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
1241 | error = ext4_journal_get_write_access(handle, bh); |
1242 | if (error) | |
1243 | goto out; | |
1244 | ||
1245 | lock_buffer(bh); | |
6048c64b AG |
1246 | hash = le32_to_cpu(BHDR(bh)->h_hash); |
1247 | ref = le32_to_cpu(BHDR(bh)->h_refcount); | |
1248 | if (ref == 1) { | |
ac27a0ec | 1249 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
1250 | /* |
1251 | * This must happen under buffer lock for | |
1252 | * ext4_xattr_block_set() to reliably detect freed block | |
1253 | */ | |
cdb7ee4c TE |
1254 | if (ea_block_cache) |
1255 | mb_cache_entry_delete(ea_block_cache, hash, | |
1256 | bh->b_blocknr); | |
ac27a0ec | 1257 | get_bh(bh); |
ec4cb1aa | 1258 | unlock_buffer(bh); |
dec214d0 TE |
1259 | |
1260 | if (ext4_has_feature_ea_inode(inode->i_sb)) | |
1261 | ext4_xattr_inode_dec_ref_all(handle, inode, bh, | |
1262 | BFIRST(bh), | |
1263 | true /* block_csum */, | |
1264 | ea_inode_array, | |
1265 | extra_credits, | |
1266 | true /* skip_quota */); | |
e6362609 TT |
1267 | ext4_free_blocks(handle, inode, bh, 0, 1, |
1268 | EXT4_FREE_BLOCKS_METADATA | | |
1269 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 1270 | } else { |
6048c64b AG |
1271 | ref--; |
1272 | BHDR(bh)->h_refcount = cpu_to_le32(ref); | |
1273 | if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { | |
1274 | struct mb_cache_entry *ce; | |
1275 | ||
cdb7ee4c TE |
1276 | if (ea_block_cache) { |
1277 | ce = mb_cache_entry_get(ea_block_cache, hash, | |
1278 | bh->b_blocknr); | |
1279 | if (ce) { | |
1280 | ce->e_reusable = 1; | |
1281 | mb_cache_entry_put(ea_block_cache, ce); | |
1282 | } | |
6048c64b AG |
1283 | } |
1284 | } | |
1285 | ||
dac7a4b4 | 1286 | ext4_xattr_block_csum_set(inode, bh); |
ec4cb1aa JK |
1287 | /* |
1288 | * Beware of this ugliness: Releasing of xattr block references | |
1289 | * from different inodes can race and so we have to protect | |
1290 | * from a race where someone else frees the block (and releases | |
1291 | * its journal_head) before we are done dirtying the buffer. In | |
1292 | * nojournal mode this race is harmless and we actually cannot | |
dac7a4b4 | 1293 | * call ext4_handle_dirty_metadata() with locked buffer as |
ec4cb1aa JK |
1294 | * that function can call sync_dirty_buffer() so for that case |
1295 | * we handle the dirtying after unlocking the buffer. | |
1296 | */ | |
1297 | if (ext4_handle_valid(handle)) | |
dac7a4b4 | 1298 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
c1bb05a6 | 1299 | unlock_buffer(bh); |
ec4cb1aa | 1300 | if (!ext4_handle_valid(handle)) |
dac7a4b4 | 1301 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
8a2bfdcb | 1302 | if (IS_SYNC(inode)) |
0390131b | 1303 | ext4_handle_sync(handle); |
1231b3a1 | 1304 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
1305 | ea_bdebug(bh, "refcount now=%d; releasing", |
1306 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 1307 | } |
8a2bfdcb MC |
1308 | out: |
1309 | ext4_std_error(inode->i_sb, error); | |
1310 | return; | |
ac27a0ec DK |
1311 | } |
1312 | ||
6dd4ee7c KS |
1313 | /* |
1314 | * Find the available free space for EAs. This also returns the total number of | |
1315 | * bytes used by EA entries. | |
1316 | */ | |
1317 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
1318 | size_t *min_offs, void *base, int *total) | |
1319 | { | |
1320 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 1321 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
1322 | size_t offs = le16_to_cpu(last->e_value_offs); |
1323 | if (offs < *min_offs) | |
1324 | *min_offs = offs; | |
1325 | } | |
7b1b2c1b TT |
1326 | if (total) |
1327 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
1328 | } |
1329 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
1330 | } | |
1331 | ||
e50e5129 AD |
1332 | /* |
1333 | * Write the value of the EA in an inode. | |
1334 | */ | |
1335 | static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, | |
1336 | const void *buf, int bufsize) | |
1337 | { | |
1338 | struct buffer_head *bh = NULL; | |
1339 | unsigned long block = 0; | |
dec214d0 TE |
1340 | int blocksize = ea_inode->i_sb->s_blocksize; |
1341 | int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; | |
e50e5129 AD |
1342 | int csize, wsize = 0; |
1343 | int ret = 0; | |
1344 | int retries = 0; | |
1345 | ||
1346 | retry: | |
1347 | while (ret >= 0 && ret < max_blocks) { | |
1348 | struct ext4_map_blocks map; | |
1349 | map.m_lblk = block += ret; | |
1350 | map.m_len = max_blocks -= ret; | |
1351 | ||
1352 | ret = ext4_map_blocks(handle, ea_inode, &map, | |
1353 | EXT4_GET_BLOCKS_CREATE); | |
1354 | if (ret <= 0) { | |
1355 | ext4_mark_inode_dirty(handle, ea_inode); | |
1356 | if (ret == -ENOSPC && | |
1357 | ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { | |
1358 | ret = 0; | |
1359 | goto retry; | |
1360 | } | |
1361 | break; | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | if (ret < 0) | |
1366 | return ret; | |
1367 | ||
1368 | block = 0; | |
1369 | while (wsize < bufsize) { | |
1370 | if (bh != NULL) | |
1371 | brelse(bh); | |
1372 | csize = (bufsize - wsize) > blocksize ? blocksize : | |
1373 | bufsize - wsize; | |
1374 | bh = ext4_getblk(handle, ea_inode, block, 0); | |
1375 | if (IS_ERR(bh)) | |
1376 | return PTR_ERR(bh); | |
1377 | ret = ext4_journal_get_write_access(handle, bh); | |
1378 | if (ret) | |
1379 | goto out; | |
1380 | ||
1381 | memcpy(bh->b_data, buf, csize); | |
1382 | set_buffer_uptodate(bh); | |
1383 | ext4_handle_dirty_metadata(handle, ea_inode, bh); | |
1384 | ||
1385 | buf += csize; | |
1386 | wsize += csize; | |
1387 | block += 1; | |
1388 | } | |
1389 | ||
1390 | inode_lock(ea_inode); | |
1391 | i_size_write(ea_inode, wsize); | |
1392 | ext4_update_i_disksize(ea_inode, wsize); | |
1393 | inode_unlock(ea_inode); | |
1394 | ||
1395 | ext4_mark_inode_dirty(handle, ea_inode); | |
1396 | ||
1397 | out: | |
1398 | brelse(bh); | |
1399 | ||
1400 | return ret; | |
1401 | } | |
1402 | ||
1403 | /* | |
1404 | * Create an inode to store the value of a large EA. | |
1405 | */ | |
1406 | static struct inode *ext4_xattr_inode_create(handle_t *handle, | |
dec214d0 | 1407 | struct inode *inode, u32 hash) |
e50e5129 AD |
1408 | { |
1409 | struct inode *ea_inode = NULL; | |
9e1ba001 | 1410 | uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; |
bd3b963b | 1411 | int err; |
e50e5129 AD |
1412 | |
1413 | /* | |
1414 | * Let the next inode be the goal, so we try and allocate the EA inode | |
1415 | * in the same group, or nearby one. | |
1416 | */ | |
1417 | ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, | |
9e1ba001 | 1418 | S_IFREG | 0600, NULL, inode->i_ino + 1, owner, |
1b917ed8 | 1419 | EXT4_EA_INODE_FL); |
e50e5129 AD |
1420 | if (!IS_ERR(ea_inode)) { |
1421 | ea_inode->i_op = &ext4_file_inode_operations; | |
1422 | ea_inode->i_fop = &ext4_file_operations; | |
1423 | ext4_set_aops(ea_inode); | |
33d201e0 | 1424 | ext4_xattr_inode_set_class(ea_inode); |
e50e5129 | 1425 | unlock_new_inode(ea_inode); |
dec214d0 TE |
1426 | ext4_xattr_inode_set_ref(ea_inode, 1); |
1427 | ext4_xattr_inode_set_hash(ea_inode, hash); | |
1428 | err = ext4_mark_inode_dirty(handle, ea_inode); | |
1429 | if (!err) | |
1430 | err = ext4_inode_attach_jinode(ea_inode); | |
bd3b963b TE |
1431 | if (err) { |
1432 | iput(ea_inode); | |
1433 | return ERR_PTR(err); | |
1434 | } | |
dec214d0 TE |
1435 | |
1436 | /* | |
1437 | * Xattr inodes are shared therefore quota charging is performed | |
1438 | * at a higher level. | |
1439 | */ | |
1440 | dquot_free_inode(ea_inode); | |
1441 | dquot_drop(ea_inode); | |
1442 | inode_lock(ea_inode); | |
1443 | ea_inode->i_flags |= S_NOQUOTA; | |
1444 | inode_unlock(ea_inode); | |
e50e5129 AD |
1445 | } |
1446 | ||
1447 | return ea_inode; | |
1448 | } | |
1449 | ||
dec214d0 TE |
1450 | static struct inode * |
1451 | ext4_xattr_inode_cache_find(struct inode *inode, const void *value, | |
1452 | size_t value_len, u32 hash) | |
e50e5129 | 1453 | { |
dec214d0 TE |
1454 | struct inode *ea_inode; |
1455 | struct mb_cache_entry *ce; | |
1456 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); | |
1457 | void *ea_data; | |
1458 | ||
cdb7ee4c TE |
1459 | if (!ea_inode_cache) |
1460 | return NULL; | |
1461 | ||
dec214d0 TE |
1462 | ce = mb_cache_entry_find_first(ea_inode_cache, hash); |
1463 | if (!ce) | |
1464 | return NULL; | |
1465 | ||
1466 | ea_data = ext4_kvmalloc(value_len, GFP_NOFS); | |
1467 | if (!ea_data) { | |
1468 | mb_cache_entry_put(ea_inode_cache, ce); | |
1469 | return NULL; | |
1470 | } | |
e50e5129 | 1471 | |
dec214d0 TE |
1472 | while (ce) { |
1473 | ea_inode = ext4_iget(inode->i_sb, ce->e_value); | |
1474 | if (!IS_ERR(ea_inode) && | |
1475 | !is_bad_inode(ea_inode) && | |
1476 | (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && | |
1477 | i_size_read(ea_inode) == value_len && | |
1478 | !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && | |
b9fc761e TE |
1479 | !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, |
1480 | value_len) && | |
dec214d0 TE |
1481 | !memcmp(value, ea_data, value_len)) { |
1482 | mb_cache_entry_touch(ea_inode_cache, ce); | |
1483 | mb_cache_entry_put(ea_inode_cache, ce); | |
1484 | kvfree(ea_data); | |
1485 | return ea_inode; | |
1486 | } | |
e50e5129 | 1487 | |
dec214d0 TE |
1488 | if (!IS_ERR(ea_inode)) |
1489 | iput(ea_inode); | |
1490 | ce = mb_cache_entry_find_next(ea_inode_cache, ce); | |
1491 | } | |
1492 | kvfree(ea_data); | |
1493 | return NULL; | |
e50e5129 AD |
1494 | } |
1495 | ||
1496 | /* | |
1497 | * Add value of the EA in an inode. | |
1498 | */ | |
dec214d0 TE |
1499 | static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, |
1500 | const void *value, size_t value_len, | |
1501 | struct inode **ret_inode) | |
e50e5129 AD |
1502 | { |
1503 | struct inode *ea_inode; | |
dec214d0 | 1504 | u32 hash; |
e50e5129 AD |
1505 | int err; |
1506 | ||
dec214d0 TE |
1507 | hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); |
1508 | ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); | |
1509 | if (ea_inode) { | |
1510 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1511 | if (err) { | |
1512 | iput(ea_inode); | |
1513 | return err; | |
1514 | } | |
1515 | ||
1516 | *ret_inode = ea_inode; | |
1517 | return 0; | |
1518 | } | |
1519 | ||
e50e5129 | 1520 | /* Create an inode for the EA value */ |
dec214d0 | 1521 | ea_inode = ext4_xattr_inode_create(handle, inode, hash); |
e50e5129 AD |
1522 | if (IS_ERR(ea_inode)) |
1523 | return PTR_ERR(ea_inode); | |
1524 | ||
1525 | err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); | |
dec214d0 TE |
1526 | if (err) { |
1527 | ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1528 | iput(ea_inode); | |
1529 | return err; | |
1530 | } | |
e50e5129 | 1531 | |
cdb7ee4c TE |
1532 | if (EA_INODE_CACHE(inode)) |
1533 | mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, | |
1534 | ea_inode->i_ino, true /* reusable */); | |
e50e5129 | 1535 | |
dec214d0 TE |
1536 | *ret_inode = ea_inode; |
1537 | return 0; | |
e50e5129 AD |
1538 | } |
1539 | ||
9c6e7853 TE |
1540 | /* |
1541 | * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode | |
1542 | * feature is enabled. | |
1543 | */ | |
1544 | #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) | |
1545 | ||
e50e5129 AD |
1546 | static int ext4_xattr_set_entry(struct ext4_xattr_info *i, |
1547 | struct ext4_xattr_search *s, | |
daf83281 TE |
1548 | handle_t *handle, struct inode *inode, |
1549 | bool is_block) | |
ac27a0ec | 1550 | { |
617ba13b | 1551 | struct ext4_xattr_entry *last; |
dec214d0 TE |
1552 | struct ext4_xattr_entry *here = s->here; |
1553 | size_t min_offs = s->end - s->base, name_len = strlen(i->name); | |
e50e5129 | 1554 | int in_inode = i->in_inode; |
dec214d0 TE |
1555 | struct inode *old_ea_inode = NULL; |
1556 | struct inode *new_ea_inode = NULL; | |
1557 | size_t old_size, new_size; | |
1558 | int ret; | |
1559 | ||
1560 | /* Space used by old and new values. */ | |
1561 | old_size = (!s->not_found && !here->e_value_inum) ? | |
1562 | EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; | |
1563 | new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; | |
1564 | ||
1565 | /* | |
1566 | * Optimization for the simple case when old and new values have the | |
1567 | * same padded sizes. Not applicable if external inodes are involved. | |
1568 | */ | |
1569 | if (new_size && new_size == old_size) { | |
1570 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1571 | void *val = s->base + offs; | |
1572 | ||
1573 | here->e_value_size = cpu_to_le32(i->value_len); | |
1574 | if (i->value == EXT4_ZERO_XATTR_VALUE) { | |
1575 | memset(val, 0, new_size); | |
1576 | } else { | |
1577 | memcpy(val, i->value, i->value_len); | |
1578 | /* Clear padding bytes. */ | |
1579 | memset(val + i->value_len, 0, new_size - i->value_len); | |
1580 | } | |
32aaf194 | 1581 | goto update_hash; |
dec214d0 | 1582 | } |
e50e5129 | 1583 | |
ac27a0ec DK |
1584 | /* Compute min_offs and last. */ |
1585 | last = s->first; | |
617ba13b | 1586 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
e50e5129 | 1587 | if (!last->e_value_inum && last->e_value_size) { |
ac27a0ec DK |
1588 | size_t offs = le16_to_cpu(last->e_value_offs); |
1589 | if (offs < min_offs) | |
1590 | min_offs = offs; | |
1591 | } | |
1592 | } | |
dec214d0 TE |
1593 | |
1594 | /* Check whether we have enough space. */ | |
ac27a0ec | 1595 | if (i->value) { |
dec214d0 | 1596 | size_t free; |
e50e5129 | 1597 | |
dec214d0 TE |
1598 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); |
1599 | if (!s->not_found) | |
1600 | free += EXT4_XATTR_LEN(name_len) + old_size; | |
e50e5129 | 1601 | |
dec214d0 TE |
1602 | if (free < EXT4_XATTR_LEN(name_len) + new_size) { |
1603 | ret = -ENOSPC; | |
1604 | goto out; | |
1605 | } | |
9c6e7853 TE |
1606 | |
1607 | /* | |
1608 | * If storing the value in an external inode is an option, | |
1609 | * reserve space for xattr entries/names in the external | |
1610 | * attribute block so that a long value does not occupy the | |
1611 | * whole space and prevent futher entries being added. | |
1612 | */ | |
daf83281 TE |
1613 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
1614 | new_size && is_block && | |
9c6e7853 TE |
1615 | (min_offs + old_size - new_size) < |
1616 | EXT4_XATTR_BLOCK_RESERVE(inode)) { | |
1617 | ret = -ENOSPC; | |
1618 | goto out; | |
1619 | } | |
ac27a0ec DK |
1620 | } |
1621 | ||
dec214d0 TE |
1622 | /* |
1623 | * Getting access to old and new ea inodes is subject to failures. | |
1624 | * Finish that work before doing any modifications to the xattr data. | |
1625 | */ | |
1626 | if (!s->not_found && here->e_value_inum) { | |
1627 | ret = ext4_xattr_inode_iget(inode, | |
1628 | le32_to_cpu(here->e_value_inum), | |
a6d05676 | 1629 | le32_to_cpu(here->e_hash), |
dec214d0 TE |
1630 | &old_ea_inode); |
1631 | if (ret) { | |
1632 | old_ea_inode = NULL; | |
1633 | goto out; | |
1634 | } | |
1635 | } | |
1636 | if (i->value && in_inode) { | |
1637 | WARN_ON_ONCE(!i->value_len); | |
ac27a0ec | 1638 | |
dec214d0 TE |
1639 | ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); |
1640 | if (ret) | |
1641 | goto out; | |
1642 | ||
1643 | ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, | |
1644 | i->value_len, | |
1645 | &new_ea_inode); | |
1646 | if (ret) { | |
1647 | new_ea_inode = NULL; | |
a6d05676 | 1648 | ext4_xattr_inode_free_quota(inode, NULL, i->value_len); |
dec214d0 | 1649 | goto out; |
ac27a0ec | 1650 | } |
dec214d0 TE |
1651 | } |
1652 | ||
1653 | if (old_ea_inode) { | |
1654 | /* We are ready to release ref count on the old_ea_inode. */ | |
1655 | ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); | |
1656 | if (ret) { | |
1657 | /* Release newly required ref count on new_ea_inode. */ | |
1658 | if (new_ea_inode) { | |
1659 | int err; | |
1660 | ||
1661 | err = ext4_xattr_inode_dec_ref(handle, | |
1662 | new_ea_inode); | |
1663 | if (err) | |
1664 | ext4_warning_inode(new_ea_inode, | |
1665 | "dec ref new_ea_inode err=%d", | |
1666 | err); | |
a6d05676 | 1667 | ext4_xattr_inode_free_quota(inode, new_ea_inode, |
dec214d0 TE |
1668 | i->value_len); |
1669 | } | |
1670 | goto out; | |
e50e5129 | 1671 | } |
dec214d0 | 1672 | |
a6d05676 | 1673 | ext4_xattr_inode_free_quota(inode, old_ea_inode, |
dec214d0 TE |
1674 | le32_to_cpu(here->e_value_size)); |
1675 | } | |
1676 | ||
1677 | /* No failures allowed past this point. */ | |
1678 | ||
1679 | if (!s->not_found && here->e_value_offs) { | |
1680 | /* Remove the old value. */ | |
1681 | void *first_val = s->base + min_offs; | |
1682 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1683 | void *val = s->base + offs; | |
1684 | ||
1685 | memmove(first_val + old_size, first_val, val - first_val); | |
1686 | memset(first_val, 0, old_size); | |
1687 | min_offs += old_size; | |
1688 | ||
1689 | /* Adjust all value offsets. */ | |
1690 | last = s->first; | |
1691 | while (!IS_LAST_ENTRY(last)) { | |
1692 | size_t o = le16_to_cpu(last->e_value_offs); | |
1693 | ||
1694 | if (!last->e_value_inum && | |
1695 | last->e_value_size && o < offs) | |
1696 | last->e_value_offs = cpu_to_le16(o + old_size); | |
1697 | last = EXT4_XATTR_NEXT(last); | |
ac27a0ec DK |
1698 | } |
1699 | } | |
1700 | ||
dec214d0 TE |
1701 | if (!i->value) { |
1702 | /* Remove old name. */ | |
1703 | size_t size = EXT4_XATTR_LEN(name_len); | |
1704 | ||
1705 | last = ENTRY((void *)last - size); | |
1706 | memmove(here, (void *)here + size, | |
1707 | (void *)last - (void *)here + sizeof(__u32)); | |
1708 | memset(last, 0, size); | |
1709 | } else if (s->not_found) { | |
1710 | /* Insert new name. */ | |
1711 | size_t size = EXT4_XATTR_LEN(name_len); | |
1712 | size_t rest = (void *)last - (void *)here + sizeof(__u32); | |
1713 | ||
1714 | memmove((void *)here + size, here, rest); | |
1715 | memset(here, 0, size); | |
1716 | here->e_name_index = i->name_index; | |
1717 | here->e_name_len = name_len; | |
1718 | memcpy(here->e_name, i->name, name_len); | |
1719 | } else { | |
1720 | /* This is an update, reset value info. */ | |
1721 | here->e_value_inum = 0; | |
1722 | here->e_value_offs = 0; | |
1723 | here->e_value_size = 0; | |
1724 | } | |
1725 | ||
ac27a0ec | 1726 | if (i->value) { |
dec214d0 | 1727 | /* Insert new value. */ |
e50e5129 | 1728 | if (in_inode) { |
dec214d0 | 1729 | here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); |
e50e5129 | 1730 | } else if (i->value_len) { |
dec214d0 TE |
1731 | void *val = s->base + min_offs - new_size; |
1732 | ||
1733 | here->e_value_offs = cpu_to_le16(min_offs - new_size); | |
bd9926e8 | 1734 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
dec214d0 | 1735 | memset(val, 0, new_size); |
bd9926e8 | 1736 | } else { |
bd9926e8 | 1737 | memcpy(val, i->value, i->value_len); |
dec214d0 TE |
1738 | /* Clear padding bytes. */ |
1739 | memset(val + i->value_len, 0, | |
1740 | new_size - i->value_len); | |
bd9926e8 | 1741 | } |
ac27a0ec | 1742 | } |
dec214d0 | 1743 | here->e_value_size = cpu_to_le32(i->value_len); |
ac27a0ec | 1744 | } |
daf83281 | 1745 | |
32aaf194 | 1746 | update_hash: |
b9fc761e TE |
1747 | if (i->value) { |
1748 | __le32 hash = 0; | |
1749 | ||
1750 | /* Entry hash calculation. */ | |
1751 | if (in_inode) { | |
1752 | __le32 crc32c_hash; | |
1753 | ||
1754 | /* | |
1755 | * Feed crc32c hash instead of the raw value for entry | |
1756 | * hash calculation. This is to avoid walking | |
1757 | * potentially long value buffer again. | |
1758 | */ | |
1759 | crc32c_hash = cpu_to_le32( | |
1760 | ext4_xattr_inode_get_hash(new_ea_inode)); | |
1761 | hash = ext4_xattr_hash_entry(here->e_name, | |
1762 | here->e_name_len, | |
1763 | &crc32c_hash, 1); | |
1764 | } else if (is_block) { | |
32aaf194 TE |
1765 | __le32 *value = s->base + le16_to_cpu( |
1766 | here->e_value_offs); | |
b9fc761e TE |
1767 | |
1768 | hash = ext4_xattr_hash_entry(here->e_name, | |
1769 | here->e_name_len, value, | |
1770 | new_size >> 2); | |
1771 | } | |
1772 | here->e_hash = hash; | |
daf83281 TE |
1773 | } |
1774 | ||
b9fc761e TE |
1775 | if (is_block) |
1776 | ext4_xattr_rehash((struct ext4_xattr_header *)s->base); | |
1777 | ||
dec214d0 | 1778 | ret = 0; |
e50e5129 | 1779 | out: |
dec214d0 TE |
1780 | iput(old_ea_inode); |
1781 | iput(new_ea_inode); | |
1782 | return ret; | |
ac27a0ec DK |
1783 | } |
1784 | ||
617ba13b MC |
1785 | struct ext4_xattr_block_find { |
1786 | struct ext4_xattr_search s; | |
ac27a0ec DK |
1787 | struct buffer_head *bh; |
1788 | }; | |
1789 | ||
1790 | static int | |
617ba13b MC |
1791 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
1792 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1793 | { |
1794 | struct super_block *sb = inode->i_sb; | |
1795 | int error; | |
1796 | ||
1797 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
1798 | i->name_index, i->name, i->value, (long)i->value_len); | |
1799 | ||
617ba13b | 1800 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 1801 | /* The inode already has an extended attribute block. */ |
617ba13b | 1802 | bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
1803 | error = -EIO; |
1804 | if (!bs->bh) | |
1805 | goto cleanup; | |
1806 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", | |
1807 | atomic_read(&(bs->bh->b_count)), | |
1808 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
de05ca85 TT |
1809 | error = ext4_xattr_check_block(inode, bs->bh); |
1810 | if (error) | |
ac27a0ec | 1811 | goto cleanup; |
ac27a0ec DK |
1812 | /* Find the named attribute. */ |
1813 | bs->s.base = BHDR(bs->bh); | |
1814 | bs->s.first = BFIRST(bs->bh); | |
1815 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
1816 | bs->s.here = bs->s.first; | |
9496005d TT |
1817 | error = xattr_find_entry(inode, &bs->s.here, bs->s.end, |
1818 | i->name_index, i->name, 1); | |
ac27a0ec DK |
1819 | if (error && error != -ENODATA) |
1820 | goto cleanup; | |
1821 | bs->s.not_found = error; | |
1822 | } | |
1823 | error = 0; | |
1824 | ||
1825 | cleanup: | |
1826 | return error; | |
1827 | } | |
1828 | ||
1829 | static int | |
617ba13b MC |
1830 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
1831 | struct ext4_xattr_info *i, | |
1832 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1833 | { |
1834 | struct super_block *sb = inode->i_sb; | |
1835 | struct buffer_head *new_bh = NULL; | |
b347e2bc TE |
1836 | struct ext4_xattr_search s_copy = bs->s; |
1837 | struct ext4_xattr_search *s = &s_copy; | |
7a2508e1 | 1838 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 1839 | int error = 0; |
47387409 | 1840 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
a6d05676 TE |
1841 | struct inode *ea_inode = NULL, *tmp_inode; |
1842 | size_t old_ea_inode_quota = 0; | |
1843 | unsigned int ea_ino; | |
1844 | ||
ac27a0ec | 1845 | |
617ba13b | 1846 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec | 1847 | |
ac27a0ec | 1848 | if (s->base) { |
5d601255 | 1849 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
1850 | error = ext4_journal_get_write_access(handle, bs->bh); |
1851 | if (error) | |
1852 | goto cleanup; | |
1853 | lock_buffer(bs->bh); | |
1854 | ||
ac27a0ec | 1855 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
1856 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
1857 | ||
1858 | /* | |
1859 | * This must happen under buffer lock for | |
1860 | * ext4_xattr_block_set() to reliably detect modified | |
1861 | * block | |
1862 | */ | |
cdb7ee4c TE |
1863 | if (ea_block_cache) |
1864 | mb_cache_entry_delete(ea_block_cache, hash, | |
1865 | bs->bh->b_blocknr); | |
ac27a0ec | 1866 | ea_bdebug(bs->bh, "modifying in-place"); |
daf83281 TE |
1867 | error = ext4_xattr_set_entry(i, s, handle, inode, |
1868 | true /* is_block */); | |
dac7a4b4 | 1869 | ext4_xattr_block_csum_set(inode, bs->bh); |
ac27a0ec | 1870 | unlock_buffer(bs->bh); |
6a797d27 | 1871 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1872 | goto bad_block; |
1873 | if (!error) | |
dac7a4b4 TT |
1874 | error = ext4_handle_dirty_metadata(handle, |
1875 | inode, | |
1876 | bs->bh); | |
ac27a0ec DK |
1877 | if (error) |
1878 | goto cleanup; | |
1879 | goto inserted; | |
1880 | } else { | |
1881 | int offset = (char *)s->here - bs->bh->b_data; | |
1882 | ||
8a2bfdcb | 1883 | unlock_buffer(bs->bh); |
ac27a0ec | 1884 | ea_bdebug(bs->bh, "cloning"); |
216553c4 | 1885 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
1886 | error = -ENOMEM; |
1887 | if (s->base == NULL) | |
1888 | goto cleanup; | |
1889 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
1890 | s->first = ENTRY(header(s->base)+1); | |
1891 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1892 | s->here = ENTRY(s->base + offset); | |
1893 | s->end = s->base + bs->bh->b_size; | |
dec214d0 TE |
1894 | |
1895 | /* | |
1896 | * If existing entry points to an xattr inode, we need | |
1897 | * to prevent ext4_xattr_set_entry() from decrementing | |
1898 | * ref count on it because the reference belongs to the | |
1899 | * original block. In this case, make the entry look | |
1900 | * like it has an empty value. | |
1901 | */ | |
1902 | if (!s->not_found && s->here->e_value_inum) { | |
a6d05676 TE |
1903 | ea_ino = le32_to_cpu(s->here->e_value_inum); |
1904 | error = ext4_xattr_inode_iget(inode, ea_ino, | |
1905 | le32_to_cpu(s->here->e_hash), | |
1906 | &tmp_inode); | |
1907 | if (error) | |
1908 | goto cleanup; | |
1909 | ||
1910 | if (!ext4_test_inode_state(tmp_inode, | |
1911 | EXT4_STATE_LUSTRE_EA_INODE)) { | |
1912 | /* | |
1913 | * Defer quota free call for previous | |
1914 | * inode until success is guaranteed. | |
1915 | */ | |
1916 | old_ea_inode_quota = le32_to_cpu( | |
dec214d0 | 1917 | s->here->e_value_size); |
a6d05676 TE |
1918 | } |
1919 | iput(tmp_inode); | |
1920 | ||
dec214d0 TE |
1921 | s->here->e_value_inum = 0; |
1922 | s->here->e_value_size = 0; | |
1923 | } | |
ac27a0ec DK |
1924 | } |
1925 | } else { | |
1926 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 1927 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
1928 | /* assert(header == s->base) */ |
1929 | error = -ENOMEM; | |
1930 | if (s->base == NULL) | |
1931 | goto cleanup; | |
617ba13b | 1932 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
1933 | header(s->base)->h_blocks = cpu_to_le32(1); |
1934 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1935 | s->first = ENTRY(header(s->base)+1); | |
1936 | s->here = ENTRY(header(s->base)+1); | |
1937 | s->end = s->base + sb->s_blocksize; | |
1938 | } | |
1939 | ||
daf83281 | 1940 | error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); |
6a797d27 | 1941 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1942 | goto bad_block; |
1943 | if (error) | |
1944 | goto cleanup; | |
dec214d0 TE |
1945 | |
1946 | if (i->value && s->here->e_value_inum) { | |
dec214d0 TE |
1947 | /* |
1948 | * A ref count on ea_inode has been taken as part of the call to | |
1949 | * ext4_xattr_set_entry() above. We would like to drop this | |
1950 | * extra ref but we have to wait until the xattr block is | |
1951 | * initialized and has its own ref count on the ea_inode. | |
1952 | */ | |
1953 | ea_ino = le32_to_cpu(s->here->e_value_inum); | |
a6d05676 TE |
1954 | error = ext4_xattr_inode_iget(inode, ea_ino, |
1955 | le32_to_cpu(s->here->e_hash), | |
1956 | &ea_inode); | |
dec214d0 TE |
1957 | if (error) { |
1958 | ea_inode = NULL; | |
1959 | goto cleanup; | |
1960 | } | |
1961 | } | |
1962 | ||
ac27a0ec DK |
1963 | inserted: |
1964 | if (!IS_LAST_ENTRY(s->first)) { | |
47387409 TE |
1965 | new_bh = ext4_xattr_block_cache_find(inode, header(s->base), |
1966 | &ce); | |
ac27a0ec DK |
1967 | if (new_bh) { |
1968 | /* We found an identical block in the cache. */ | |
1969 | if (new_bh == bs->bh) | |
1970 | ea_bdebug(new_bh, "keeping"); | |
1971 | else { | |
6048c64b AG |
1972 | u32 ref; |
1973 | ||
b8cb5a54 TE |
1974 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
1975 | ||
ac27a0ec DK |
1976 | /* The old block is released after updating |
1977 | the inode. */ | |
1231b3a1 LC |
1978 | error = dquot_alloc_block(inode, |
1979 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 1980 | if (error) |
ac27a0ec | 1981 | goto cleanup; |
5d601255 | 1982 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 1983 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
1984 | new_bh); |
1985 | if (error) | |
1986 | goto cleanup_dquot; | |
1987 | lock_buffer(new_bh); | |
82939d79 JK |
1988 | /* |
1989 | * We have to be careful about races with | |
6048c64b AG |
1990 | * freeing, rehashing or adding references to |
1991 | * xattr block. Once we hold buffer lock xattr | |
1992 | * block's state is stable so we can check | |
1993 | * whether the block got freed / rehashed or | |
1994 | * not. Since we unhash mbcache entry under | |
1995 | * buffer lock when freeing / rehashing xattr | |
1996 | * block, checking whether entry is still | |
1997 | * hashed is reliable. Same rules hold for | |
1998 | * e_reusable handling. | |
82939d79 | 1999 | */ |
6048c64b AG |
2000 | if (hlist_bl_unhashed(&ce->e_hash_list) || |
2001 | !ce->e_reusable) { | |
82939d79 JK |
2002 | /* |
2003 | * Undo everything and check mbcache | |
2004 | * again. | |
2005 | */ | |
2006 | unlock_buffer(new_bh); | |
2007 | dquot_free_block(inode, | |
2008 | EXT4_C2B(EXT4_SB(sb), | |
2009 | 1)); | |
2010 | brelse(new_bh); | |
47387409 | 2011 | mb_cache_entry_put(ea_block_cache, ce); |
82939d79 JK |
2012 | ce = NULL; |
2013 | new_bh = NULL; | |
2014 | goto inserted; | |
2015 | } | |
6048c64b AG |
2016 | ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
2017 | BHDR(new_bh)->h_refcount = cpu_to_le32(ref); | |
2018 | if (ref >= EXT4_XATTR_REFCOUNT_MAX) | |
2019 | ce->e_reusable = 0; | |
ac27a0ec | 2020 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
6048c64b | 2021 | ref); |
dac7a4b4 | 2022 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec | 2023 | unlock_buffer(new_bh); |
dac7a4b4 TT |
2024 | error = ext4_handle_dirty_metadata(handle, |
2025 | inode, | |
2026 | new_bh); | |
ac27a0ec DK |
2027 | if (error) |
2028 | goto cleanup_dquot; | |
2029 | } | |
47387409 TE |
2030 | mb_cache_entry_touch(ea_block_cache, ce); |
2031 | mb_cache_entry_put(ea_block_cache, ce); | |
ac27a0ec DK |
2032 | ce = NULL; |
2033 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
2034 | /* We were modifying this block in-place. */ | |
2035 | ea_bdebug(bs->bh, "keeping this block"); | |
ec000220 | 2036 | ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); |
ac27a0ec DK |
2037 | new_bh = bs->bh; |
2038 | get_bh(new_bh); | |
2039 | } else { | |
2040 | /* We need to allocate a new block */ | |
fb0a387d ES |
2041 | ext4_fsblk_t goal, block; |
2042 | ||
b8cb5a54 TE |
2043 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
2044 | ||
fb0a387d | 2045 | goal = ext4_group_first_block_no(sb, |
d00a6d7b | 2046 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
2047 | |
2048 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 2049 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2050 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
2051 | ||
55f020db AH |
2052 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
2053 | NULL, &error); | |
ac27a0ec DK |
2054 | if (error) |
2055 | goto cleanup; | |
fb0a387d | 2056 | |
12e9b892 | 2057 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2058 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
2059 | ||
ace36ad4 JP |
2060 | ea_idebug(inode, "creating block %llu", |
2061 | (unsigned long long)block); | |
ac27a0ec DK |
2062 | |
2063 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 2064 | if (unlikely(!new_bh)) { |
860d21e2 | 2065 | error = -ENOMEM; |
ac27a0ec | 2066 | getblk_failed: |
7dc57615 | 2067 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 2068 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
2069 | goto cleanup; |
2070 | } | |
dec214d0 TE |
2071 | error = ext4_xattr_inode_inc_ref_all(handle, inode, |
2072 | ENTRY(header(s->base)+1)); | |
2073 | if (error) | |
2074 | goto getblk_failed; | |
2075 | if (ea_inode) { | |
2076 | /* Drop the extra ref on ea_inode. */ | |
2077 | error = ext4_xattr_inode_dec_ref(handle, | |
2078 | ea_inode); | |
2079 | if (error) | |
2080 | ext4_warning_inode(ea_inode, | |
2081 | "dec ref error=%d", | |
2082 | error); | |
2083 | iput(ea_inode); | |
2084 | ea_inode = NULL; | |
2085 | } | |
2086 | ||
ac27a0ec | 2087 | lock_buffer(new_bh); |
617ba13b | 2088 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
2089 | if (error) { |
2090 | unlock_buffer(new_bh); | |
860d21e2 | 2091 | error = -EIO; |
ac27a0ec DK |
2092 | goto getblk_failed; |
2093 | } | |
2094 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
dac7a4b4 | 2095 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec DK |
2096 | set_buffer_uptodate(new_bh); |
2097 | unlock_buffer(new_bh); | |
47387409 | 2098 | ext4_xattr_block_cache_insert(ea_block_cache, new_bh); |
dac7a4b4 TT |
2099 | error = ext4_handle_dirty_metadata(handle, inode, |
2100 | new_bh); | |
ac27a0ec DK |
2101 | if (error) |
2102 | goto cleanup; | |
2103 | } | |
2104 | } | |
2105 | ||
a6d05676 TE |
2106 | if (old_ea_inode_quota) |
2107 | ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); | |
dec214d0 | 2108 | |
ac27a0ec | 2109 | /* Update the inode. */ |
617ba13b | 2110 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
2111 | |
2112 | /* Drop the previous xattr block. */ | |
dec214d0 TE |
2113 | if (bs->bh && bs->bh != new_bh) { |
2114 | struct ext4_xattr_inode_array *ea_inode_array = NULL; | |
2115 | ||
2116 | ext4_xattr_release_block(handle, inode, bs->bh, | |
2117 | &ea_inode_array, | |
2118 | 0 /* extra_credits */); | |
2119 | ext4_xattr_inode_array_free(ea_inode_array); | |
2120 | } | |
ac27a0ec DK |
2121 | error = 0; |
2122 | ||
2123 | cleanup: | |
dec214d0 TE |
2124 | if (ea_inode) { |
2125 | int error2; | |
2126 | ||
2127 | error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
2128 | if (error2) | |
2129 | ext4_warning_inode(ea_inode, "dec ref error=%d", | |
2130 | error2); | |
2131 | ||
2132 | /* If there was an error, revert the quota charge. */ | |
2133 | if (error) | |
a6d05676 | 2134 | ext4_xattr_inode_free_quota(inode, ea_inode, |
dec214d0 TE |
2135 | i_size_read(ea_inode)); |
2136 | iput(ea_inode); | |
2137 | } | |
ac27a0ec | 2138 | if (ce) |
47387409 | 2139 | mb_cache_entry_put(ea_block_cache, ce); |
ac27a0ec DK |
2140 | brelse(new_bh); |
2141 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
2142 | kfree(s->base); | |
2143 | ||
2144 | return error; | |
2145 | ||
2146 | cleanup_dquot: | |
1231b3a1 | 2147 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
2148 | goto cleanup; |
2149 | ||
2150 | bad_block: | |
24676da4 TT |
2151 | EXT4_ERROR_INODE(inode, "bad block %llu", |
2152 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
2153 | goto cleanup; |
2154 | ||
2155 | #undef header | |
2156 | } | |
2157 | ||
879b3825 TM |
2158 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
2159 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2160 | { |
617ba13b MC |
2161 | struct ext4_xattr_ibody_header *header; |
2162 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
2163 | int error; |
2164 | ||
617ba13b | 2165 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 2166 | return 0; |
617ba13b | 2167 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
2168 | header = IHDR(inode, raw_inode); |
2169 | is->s.base = is->s.first = IFIRST(header); | |
2170 | is->s.here = is->s.first; | |
617ba13b | 2171 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 2172 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
9e92f48c | 2173 | error = xattr_check_inode(inode, header, is->s.end); |
ac27a0ec DK |
2174 | if (error) |
2175 | return error; | |
2176 | /* Find the named attribute. */ | |
9496005d TT |
2177 | error = xattr_find_entry(inode, &is->s.here, is->s.end, |
2178 | i->name_index, i->name, 0); | |
ac27a0ec DK |
2179 | if (error && error != -ENODATA) |
2180 | return error; | |
2181 | is->s.not_found = error; | |
2182 | } | |
2183 | return 0; | |
2184 | } | |
2185 | ||
0d812f77 TM |
2186 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
2187 | struct ext4_xattr_info *i, | |
2188 | struct ext4_xattr_ibody_find *is) | |
2189 | { | |
2190 | struct ext4_xattr_ibody_header *header; | |
2191 | struct ext4_xattr_search *s = &is->s; | |
2192 | int error; | |
2193 | ||
2194 | if (EXT4_I(inode)->i_extra_isize == 0) | |
2195 | return -ENOSPC; | |
daf83281 | 2196 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
0d812f77 TM |
2197 | if (error) { |
2198 | if (error == -ENOSPC && | |
2199 | ext4_has_inline_data(inode)) { | |
2200 | error = ext4_try_to_evict_inline_data(handle, inode, | |
2201 | EXT4_XATTR_LEN(strlen(i->name) + | |
2202 | EXT4_XATTR_SIZE(i->value_len))); | |
2203 | if (error) | |
2204 | return error; | |
2205 | error = ext4_xattr_ibody_find(inode, i, is); | |
2206 | if (error) | |
2207 | return error; | |
daf83281 TE |
2208 | error = ext4_xattr_set_entry(i, s, handle, inode, |
2209 | false /* is_block */); | |
0d812f77 TM |
2210 | } |
2211 | if (error) | |
2212 | return error; | |
2213 | } | |
2214 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); | |
2215 | if (!IS_LAST_ENTRY(s->first)) { | |
2216 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
2217 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
2218 | } else { | |
2219 | header->h_magic = cpu_to_le32(0); | |
2220 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
2221 | } | |
2222 | return 0; | |
2223 | } | |
2224 | ||
e50e5129 | 2225 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, |
0d812f77 TM |
2226 | struct ext4_xattr_info *i, |
2227 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2228 | { |
617ba13b MC |
2229 | struct ext4_xattr_ibody_header *header; |
2230 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
2231 | int error; |
2232 | ||
617ba13b | 2233 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 2234 | return -ENOSPC; |
daf83281 | 2235 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
ac27a0ec DK |
2236 | if (error) |
2237 | return error; | |
617ba13b | 2238 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 2239 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 2240 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 2241 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2242 | } else { |
2243 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 2244 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2245 | } |
2246 | return 0; | |
2247 | } | |
2248 | ||
3fd16462 JK |
2249 | static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
2250 | struct ext4_xattr_info *i) | |
2251 | { | |
2252 | void *value; | |
2253 | ||
0bd454c0 TE |
2254 | /* When e_value_inum is set the value is stored externally. */ |
2255 | if (s->here->e_value_inum) | |
2256 | return 0; | |
3fd16462 JK |
2257 | if (le32_to_cpu(s->here->e_value_size) != i->value_len) |
2258 | return 0; | |
2259 | value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); | |
2260 | return !memcmp(value, i->value, i->value_len); | |
2261 | } | |
2262 | ||
dec214d0 TE |
2263 | static struct buffer_head *ext4_xattr_get_block(struct inode *inode) |
2264 | { | |
2265 | struct buffer_head *bh; | |
2266 | int error; | |
2267 | ||
2268 | if (!EXT4_I(inode)->i_file_acl) | |
2269 | return NULL; | |
2270 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
2271 | if (!bh) | |
2272 | return ERR_PTR(-EIO); | |
2273 | error = ext4_xattr_check_block(inode, bh); | |
2274 | if (error) | |
2275 | return ERR_PTR(error); | |
2276 | return bh; | |
2277 | } | |
2278 | ||
ac27a0ec | 2279 | /* |
617ba13b | 2280 | * ext4_xattr_set_handle() |
ac27a0ec | 2281 | * |
6e9510b0 | 2282 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
2283 | * is NULL to remove an existing extended attribute, and non-NULL to |
2284 | * either replace an existing extended attribute, or create a new extended | |
2285 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
2286 | * specify that an extended attribute must exist and must not exist | |
2287 | * previous to the call, respectively. | |
2288 | * | |
2289 | * Returns 0, or a negative error number on failure. | |
2290 | */ | |
2291 | int | |
617ba13b | 2292 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
2293 | const char *name, const void *value, size_t value_len, |
2294 | int flags) | |
2295 | { | |
617ba13b | 2296 | struct ext4_xattr_info i = { |
ac27a0ec DK |
2297 | .name_index = name_index, |
2298 | .name = name, | |
2299 | .value = value, | |
2300 | .value_len = value_len, | |
e50e5129 | 2301 | .in_inode = 0, |
ac27a0ec | 2302 | }; |
617ba13b | 2303 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
2304 | .s = { .not_found = -ENODATA, }, |
2305 | }; | |
617ba13b | 2306 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
2307 | .s = { .not_found = -ENODATA, }, |
2308 | }; | |
c755e251 | 2309 | int no_expand; |
ac27a0ec DK |
2310 | int error; |
2311 | ||
2312 | if (!name) | |
2313 | return -EINVAL; | |
2314 | if (strlen(name) > 255) | |
2315 | return -ERANGE; | |
b8cb5a54 | 2316 | |
c755e251 | 2317 | ext4_write_lock_xattr(inode, &no_expand); |
4d20c685 | 2318 | |
c1a5d5f6 TE |
2319 | /* Check journal credits under write lock. */ |
2320 | if (ext4_handle_valid(handle)) { | |
dec214d0 | 2321 | struct buffer_head *bh; |
c1a5d5f6 TE |
2322 | int credits; |
2323 | ||
dec214d0 TE |
2324 | bh = ext4_xattr_get_block(inode); |
2325 | if (IS_ERR(bh)) { | |
2326 | error = PTR_ERR(bh); | |
2327 | goto cleanup; | |
2328 | } | |
2329 | ||
af65207c TE |
2330 | credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2331 | value_len, | |
2332 | flags & XATTR_CREATE); | |
dec214d0 TE |
2333 | brelse(bh); |
2334 | ||
c1a5d5f6 TE |
2335 | if (!ext4_handle_has_enough_credits(handle, credits)) { |
2336 | error = -ENOSPC; | |
2337 | goto cleanup; | |
2338 | } | |
2339 | } | |
2340 | ||
66543617 | 2341 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
2342 | if (error) |
2343 | goto cleanup; | |
2344 | ||
19f5fb7a | 2345 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
2346 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
2347 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 2348 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
2349 | } |
2350 | ||
617ba13b | 2351 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
2352 | if (error) |
2353 | goto cleanup; | |
2354 | if (is.s.not_found) | |
617ba13b | 2355 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
2356 | if (error) |
2357 | goto cleanup; | |
2358 | if (is.s.not_found && bs.s.not_found) { | |
2359 | error = -ENODATA; | |
2360 | if (flags & XATTR_REPLACE) | |
2361 | goto cleanup; | |
2362 | error = 0; | |
2363 | if (!value) | |
2364 | goto cleanup; | |
2365 | } else { | |
2366 | error = -EEXIST; | |
2367 | if (flags & XATTR_CREATE) | |
2368 | goto cleanup; | |
2369 | } | |
dec214d0 | 2370 | |
ac27a0ec DK |
2371 | if (!value) { |
2372 | if (!is.s.not_found) | |
e50e5129 | 2373 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 2374 | else if (!bs.s.not_found) |
617ba13b | 2375 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2376 | } else { |
3fd16462 JK |
2377 | error = 0; |
2378 | /* Xattr value did not change? Save us some work and bail out */ | |
2379 | if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) | |
2380 | goto cleanup; | |
2381 | if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) | |
2382 | goto cleanup; | |
2383 | ||
b347e2bc TE |
2384 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2385 | (EXT4_XATTR_SIZE(i.value_len) > | |
2386 | EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) | |
2387 | i.in_inode = 1; | |
2388 | retry_inode: | |
e50e5129 | 2389 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
2390 | if (!error && !bs.s.not_found) { |
2391 | i.value = NULL; | |
617ba13b | 2392 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2393 | } else if (error == -ENOSPC) { |
7e01c8e5 TY |
2394 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
2395 | error = ext4_xattr_block_find(inode, &i, &bs); | |
2396 | if (error) | |
2397 | goto cleanup; | |
2398 | } | |
617ba13b | 2399 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
b347e2bc | 2400 | if (!error && !is.s.not_found) { |
ac27a0ec | 2401 | i.value = NULL; |
e50e5129 AD |
2402 | error = ext4_xattr_ibody_set(handle, inode, &i, |
2403 | &is); | |
b347e2bc TE |
2404 | } else if (error == -ENOSPC) { |
2405 | /* | |
2406 | * Xattr does not fit in the block, store at | |
2407 | * external inode if possible. | |
2408 | */ | |
2409 | if (ext4_has_feature_ea_inode(inode->i_sb) && | |
2410 | !i.in_inode) { | |
2411 | i.in_inode = 1; | |
2412 | goto retry_inode; | |
2413 | } | |
ac27a0ec DK |
2414 | } |
2415 | } | |
2416 | } | |
2417 | if (!error) { | |
617ba13b | 2418 | ext4_xattr_update_super_block(handle, inode->i_sb); |
eeca7ea1 | 2419 | inode->i_ctime = current_time(inode); |
6dd4ee7c | 2420 | if (!value) |
c755e251 | 2421 | no_expand = 0; |
617ba13b | 2422 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 2423 | /* |
617ba13b | 2424 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
2425 | * error != 0. |
2426 | */ | |
2427 | is.iloc.bh = NULL; | |
2428 | if (IS_SYNC(inode)) | |
0390131b | 2429 | ext4_handle_sync(handle); |
ac27a0ec DK |
2430 | } |
2431 | ||
2432 | cleanup: | |
2433 | brelse(is.iloc.bh); | |
2434 | brelse(bs.bh); | |
c755e251 | 2435 | ext4_write_unlock_xattr(inode, &no_expand); |
ac27a0ec DK |
2436 | return error; |
2437 | } | |
2438 | ||
af65207c TE |
2439 | int ext4_xattr_set_credits(struct inode *inode, size_t value_len, |
2440 | bool is_create, int *credits) | |
c1a5d5f6 | 2441 | { |
dec214d0 TE |
2442 | struct buffer_head *bh; |
2443 | int err; | |
c1a5d5f6 | 2444 | |
dec214d0 | 2445 | *credits = 0; |
c1a5d5f6 | 2446 | |
dec214d0 TE |
2447 | if (!EXT4_SB(inode->i_sb)->s_journal) |
2448 | return 0; | |
c1a5d5f6 | 2449 | |
dec214d0 | 2450 | down_read(&EXT4_I(inode)->xattr_sem); |
c1a5d5f6 | 2451 | |
dec214d0 TE |
2452 | bh = ext4_xattr_get_block(inode); |
2453 | if (IS_ERR(bh)) { | |
2454 | err = PTR_ERR(bh); | |
2455 | } else { | |
af65207c TE |
2456 | *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2457 | value_len, is_create); | |
dec214d0 TE |
2458 | brelse(bh); |
2459 | err = 0; | |
c1a5d5f6 | 2460 | } |
dec214d0 TE |
2461 | |
2462 | up_read(&EXT4_I(inode)->xattr_sem); | |
2463 | return err; | |
c1a5d5f6 TE |
2464 | } |
2465 | ||
ac27a0ec | 2466 | /* |
617ba13b | 2467 | * ext4_xattr_set() |
ac27a0ec | 2468 | * |
617ba13b | 2469 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
2470 | * attribute modification is a filesystem transaction by itself. |
2471 | * | |
2472 | * Returns 0, or a negative error number on failure. | |
2473 | */ | |
2474 | int | |
617ba13b | 2475 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
2476 | const void *value, size_t value_len, int flags) |
2477 | { | |
2478 | handle_t *handle; | |
e50e5129 | 2479 | struct super_block *sb = inode->i_sb; |
ac27a0ec | 2480 | int error, retries = 0; |
c1a5d5f6 | 2481 | int credits; |
ac27a0ec | 2482 | |
b8cb5a54 TE |
2483 | error = dquot_initialize(inode); |
2484 | if (error) | |
2485 | return error; | |
e50e5129 | 2486 | |
ac27a0ec | 2487 | retry: |
af65207c TE |
2488 | error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, |
2489 | &credits); | |
dec214d0 TE |
2490 | if (error) |
2491 | return error; | |
2492 | ||
9924a92a | 2493 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
2494 | if (IS_ERR(handle)) { |
2495 | error = PTR_ERR(handle); | |
2496 | } else { | |
2497 | int error2; | |
2498 | ||
617ba13b | 2499 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 2500 | value, value_len, flags); |
617ba13b | 2501 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 2502 | if (error == -ENOSPC && |
e50e5129 | 2503 | ext4_should_retry_alloc(sb, &retries)) |
ac27a0ec DK |
2504 | goto retry; |
2505 | if (error == 0) | |
2506 | error = error2; | |
2507 | } | |
2508 | ||
2509 | return error; | |
2510 | } | |
2511 | ||
6dd4ee7c KS |
2512 | /* |
2513 | * Shift the EA entries in the inode to create space for the increased | |
2514 | * i_extra_isize. | |
2515 | */ | |
2516 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
2517 | int value_offs_shift, void *to, | |
94405713 | 2518 | void *from, size_t n) |
6dd4ee7c KS |
2519 | { |
2520 | struct ext4_xattr_entry *last = entry; | |
2521 | int new_offs; | |
2522 | ||
94405713 JK |
2523 | /* We always shift xattr headers further thus offsets get lower */ |
2524 | BUG_ON(value_offs_shift > 0); | |
2525 | ||
6dd4ee7c KS |
2526 | /* Adjust the value offsets of the entries */ |
2527 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 2528 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
2529 | new_offs = le16_to_cpu(last->e_value_offs) + |
2530 | value_offs_shift; | |
6dd4ee7c KS |
2531 | last->e_value_offs = cpu_to_le16(new_offs); |
2532 | } | |
2533 | } | |
2534 | /* Shift the entries by n bytes */ | |
2535 | memmove(to, from, n); | |
2536 | } | |
2537 | ||
3f2571c1 JK |
2538 | /* |
2539 | * Move xattr pointed to by 'entry' from inode into external xattr block | |
2540 | */ | |
2541 | static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, | |
2542 | struct ext4_inode *raw_inode, | |
2543 | struct ext4_xattr_entry *entry) | |
2544 | { | |
2545 | struct ext4_xattr_ibody_find *is = NULL; | |
2546 | struct ext4_xattr_block_find *bs = NULL; | |
2547 | char *buffer = NULL, *b_entry_name = NULL; | |
f6109100 | 2548 | size_t value_size = le32_to_cpu(entry->e_value_size); |
3f2571c1 JK |
2549 | struct ext4_xattr_info i = { |
2550 | .value = NULL, | |
2551 | .value_len = 0, | |
2552 | .name_index = entry->e_name_index, | |
f6109100 | 2553 | .in_inode = !!entry->e_value_inum, |
3f2571c1 JK |
2554 | }; |
2555 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2556 | int error; | |
2557 | ||
3f2571c1 JK |
2558 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); |
2559 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
2560 | buffer = kmalloc(value_size, GFP_NOFS); | |
2561 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
2562 | if (!is || !bs || !buffer || !b_entry_name) { | |
2563 | error = -ENOMEM; | |
2564 | goto out; | |
2565 | } | |
2566 | ||
2567 | is->s.not_found = -ENODATA; | |
2568 | bs->s.not_found = -ENODATA; | |
2569 | is->iloc.bh = NULL; | |
2570 | bs->bh = NULL; | |
2571 | ||
2572 | /* Save the entry name and the entry value */ | |
f6109100 | 2573 | if (entry->e_value_inum) { |
b9fc761e | 2574 | error = ext4_xattr_inode_get(inode, entry, buffer, value_size); |
f6109100 TE |
2575 | if (error) |
2576 | goto out; | |
2577 | } else { | |
2578 | size_t value_offs = le16_to_cpu(entry->e_value_offs); | |
2579 | memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); | |
2580 | } | |
2581 | ||
3f2571c1 JK |
2582 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); |
2583 | b_entry_name[entry->e_name_len] = '\0'; | |
2584 | i.name = b_entry_name; | |
2585 | ||
2586 | error = ext4_get_inode_loc(inode, &is->iloc); | |
2587 | if (error) | |
2588 | goto out; | |
2589 | ||
2590 | error = ext4_xattr_ibody_find(inode, &i, is); | |
2591 | if (error) | |
2592 | goto out; | |
2593 | ||
2594 | /* Remove the chosen entry from the inode */ | |
e50e5129 | 2595 | error = ext4_xattr_ibody_set(handle, inode, &i, is); |
3f2571c1 JK |
2596 | if (error) |
2597 | goto out; | |
2598 | ||
3f2571c1 JK |
2599 | i.value = buffer; |
2600 | i.value_len = value_size; | |
2601 | error = ext4_xattr_block_find(inode, &i, bs); | |
2602 | if (error) | |
2603 | goto out; | |
2604 | ||
2605 | /* Add entry which was removed from the inode into the block */ | |
2606 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
2607 | if (error) | |
2608 | goto out; | |
2609 | error = 0; | |
2610 | out: | |
2611 | kfree(b_entry_name); | |
2612 | kfree(buffer); | |
2613 | if (is) | |
2614 | brelse(is->iloc.bh); | |
2615 | kfree(is); | |
2616 | kfree(bs); | |
2617 | ||
2618 | return error; | |
2619 | } | |
2620 | ||
dfa2064b JK |
2621 | static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, |
2622 | struct ext4_inode *raw_inode, | |
2623 | int isize_diff, size_t ifree, | |
2624 | size_t bfree, int *total_ino) | |
2625 | { | |
2626 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2627 | struct ext4_xattr_entry *small_entry; | |
2628 | struct ext4_xattr_entry *entry; | |
2629 | struct ext4_xattr_entry *last; | |
2630 | unsigned int entry_size; /* EA entry size */ | |
2631 | unsigned int total_size; /* EA entry size + value size */ | |
2632 | unsigned int min_total_size; | |
2633 | int error; | |
2634 | ||
2635 | while (isize_diff > ifree) { | |
2636 | entry = NULL; | |
2637 | small_entry = NULL; | |
2638 | min_total_size = ~0U; | |
2639 | last = IFIRST(header); | |
2640 | /* Find the entry best suited to be pushed into EA block */ | |
2641 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
9bb21ced TE |
2642 | total_size = EXT4_XATTR_LEN(last->e_name_len); |
2643 | if (!last->e_value_inum) | |
2644 | total_size += EXT4_XATTR_SIZE( | |
2645 | le32_to_cpu(last->e_value_size)); | |
dfa2064b JK |
2646 | if (total_size <= bfree && |
2647 | total_size < min_total_size) { | |
2648 | if (total_size + ifree < isize_diff) { | |
2649 | small_entry = last; | |
2650 | } else { | |
2651 | entry = last; | |
2652 | min_total_size = total_size; | |
2653 | } | |
2654 | } | |
2655 | } | |
2656 | ||
2657 | if (entry == NULL) { | |
2658 | if (small_entry == NULL) | |
2659 | return -ENOSPC; | |
2660 | entry = small_entry; | |
2661 | } | |
2662 | ||
2663 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
9bb21ced TE |
2664 | total_size = entry_size; |
2665 | if (!entry->e_value_inum) | |
2666 | total_size += EXT4_XATTR_SIZE( | |
2667 | le32_to_cpu(entry->e_value_size)); | |
dfa2064b JK |
2668 | error = ext4_xattr_move_to_block(handle, inode, raw_inode, |
2669 | entry); | |
2670 | if (error) | |
2671 | return error; | |
2672 | ||
2673 | *total_ino -= entry_size; | |
2674 | ifree += total_size; | |
2675 | bfree -= total_size; | |
2676 | } | |
2677 | ||
2678 | return 0; | |
2679 | } | |
2680 | ||
6dd4ee7c KS |
2681 | /* |
2682 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
2683 | * Returns 0 on success or negative error number on failure. | |
2684 | */ | |
2685 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
2686 | struct ext4_inode *raw_inode, handle_t *handle) | |
2687 | { | |
2688 | struct ext4_xattr_ibody_header *header; | |
b640b2c5 | 2689 | struct buffer_head *bh; |
cf0a5e81 MX |
2690 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
2691 | static unsigned int mnt_count; | |
e3014d14 JK |
2692 | size_t min_offs; |
2693 | size_t ifree, bfree; | |
7b1b2c1b | 2694 | int total_ino; |
6e0cd088 | 2695 | void *base, *end; |
d0141191 | 2696 | int error = 0, tried_min_extra_isize = 0; |
cf0a5e81 | 2697 | int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); |
d0141191 | 2698 | int isize_diff; /* How much do we need to grow i_extra_isize */ |
6dd4ee7c | 2699 | |
6dd4ee7c | 2700 | retry: |
d0141191 | 2701 | isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; |
2e81a4ee | 2702 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) |
b640b2c5 | 2703 | return 0; |
6dd4ee7c KS |
2704 | |
2705 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
2706 | |
2707 | /* | |
2708 | * Check if enough free space is available in the inode to shift the | |
2709 | * entries ahead by new_extra_isize. | |
2710 | */ | |
2711 | ||
6e0cd088 | 2712 | base = IFIRST(header); |
6dd4ee7c KS |
2713 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
2714 | min_offs = end - base; | |
6dd4ee7c KS |
2715 | total_ino = sizeof(struct ext4_xattr_ibody_header); |
2716 | ||
9e92f48c TT |
2717 | error = xattr_check_inode(inode, header, end); |
2718 | if (error) | |
2719 | goto cleanup; | |
2720 | ||
6e0cd088 | 2721 | ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); |
e3014d14 JK |
2722 | if (ifree >= isize_diff) |
2723 | goto shift; | |
6dd4ee7c KS |
2724 | |
2725 | /* | |
2726 | * Enough free space isn't available in the inode, check if | |
2727 | * EA block can hold new_extra_isize bytes. | |
2728 | */ | |
2729 | if (EXT4_I(inode)->i_file_acl) { | |
2730 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
2731 | error = -EIO; | |
2732 | if (!bh) | |
2733 | goto cleanup; | |
de05ca85 TT |
2734 | error = ext4_xattr_check_block(inode, bh); |
2735 | if (error) | |
6dd4ee7c | 2736 | goto cleanup; |
6dd4ee7c | 2737 | base = BHDR(bh); |
6dd4ee7c KS |
2738 | end = bh->b_data + bh->b_size; |
2739 | min_offs = end - base; | |
6e0cd088 JK |
2740 | bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, |
2741 | NULL); | |
b640b2c5 | 2742 | brelse(bh); |
e3014d14 | 2743 | if (bfree + ifree < isize_diff) { |
6dd4ee7c KS |
2744 | if (!tried_min_extra_isize && s_min_extra_isize) { |
2745 | tried_min_extra_isize++; | |
2746 | new_extra_isize = s_min_extra_isize; | |
6dd4ee7c KS |
2747 | goto retry; |
2748 | } | |
dfa2064b | 2749 | error = -ENOSPC; |
6dd4ee7c KS |
2750 | goto cleanup; |
2751 | } | |
2752 | } else { | |
e3014d14 | 2753 | bfree = inode->i_sb->s_blocksize; |
6dd4ee7c KS |
2754 | } |
2755 | ||
dfa2064b JK |
2756 | error = ext4_xattr_make_inode_space(handle, inode, raw_inode, |
2757 | isize_diff, ifree, bfree, | |
2758 | &total_ino); | |
2759 | if (error) { | |
2760 | if (error == -ENOSPC && !tried_min_extra_isize && | |
2761 | s_min_extra_isize) { | |
2762 | tried_min_extra_isize++; | |
2763 | new_extra_isize = s_min_extra_isize; | |
dfa2064b | 2764 | goto retry; |
6dd4ee7c | 2765 | } |
dfa2064b | 2766 | goto cleanup; |
6dd4ee7c | 2767 | } |
e3014d14 JK |
2768 | shift: |
2769 | /* Adjust the offsets and shift the remaining entries ahead */ | |
6e0cd088 | 2770 | ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize |
e3014d14 JK |
2771 | - new_extra_isize, (void *)raw_inode + |
2772 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
94405713 | 2773 | (void *)header, total_ino); |
e3014d14 | 2774 | EXT4_I(inode)->i_extra_isize = new_extra_isize; |
6dd4ee7c KS |
2775 | |
2776 | cleanup: | |
b640b2c5 | 2777 | if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { |
cf0a5e81 MX |
2778 | ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", |
2779 | inode->i_ino); | |
2780 | mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); | |
2781 | } | |
6dd4ee7c KS |
2782 | return error; |
2783 | } | |
2784 | ||
e50e5129 AD |
2785 | #define EIA_INCR 16 /* must be 2^n */ |
2786 | #define EIA_MASK (EIA_INCR - 1) | |
dec214d0 TE |
2787 | |
2788 | /* Add the large xattr @inode into @ea_inode_array for deferred iput(). | |
0421a189 | 2789 | * If @ea_inode_array is new or full it will be grown and the old |
e50e5129 AD |
2790 | * contents copied over. |
2791 | */ | |
2792 | static int | |
0421a189 TE |
2793 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, |
2794 | struct inode *inode) | |
e50e5129 | 2795 | { |
0421a189 | 2796 | if (*ea_inode_array == NULL) { |
e50e5129 AD |
2797 | /* |
2798 | * Start with 15 inodes, so it fits into a power-of-two size. | |
0421a189 | 2799 | * If *ea_inode_array is NULL, this is essentially offsetof() |
e50e5129 | 2800 | */ |
0421a189 TE |
2801 | (*ea_inode_array) = |
2802 | kmalloc(offsetof(struct ext4_xattr_inode_array, | |
2803 | inodes[EIA_MASK]), | |
e50e5129 | 2804 | GFP_NOFS); |
0421a189 | 2805 | if (*ea_inode_array == NULL) |
e50e5129 | 2806 | return -ENOMEM; |
0421a189 TE |
2807 | (*ea_inode_array)->count = 0; |
2808 | } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { | |
e50e5129 | 2809 | /* expand the array once all 15 + n * 16 slots are full */ |
0421a189 TE |
2810 | struct ext4_xattr_inode_array *new_array = NULL; |
2811 | int count = (*ea_inode_array)->count; | |
e50e5129 AD |
2812 | |
2813 | /* if new_array is NULL, this is essentially offsetof() */ | |
2814 | new_array = kmalloc( | |
0421a189 TE |
2815 | offsetof(struct ext4_xattr_inode_array, |
2816 | inodes[count + EIA_INCR]), | |
e50e5129 AD |
2817 | GFP_NOFS); |
2818 | if (new_array == NULL) | |
2819 | return -ENOMEM; | |
0421a189 TE |
2820 | memcpy(new_array, *ea_inode_array, |
2821 | offsetof(struct ext4_xattr_inode_array, inodes[count])); | |
2822 | kfree(*ea_inode_array); | |
2823 | *ea_inode_array = new_array; | |
e50e5129 | 2824 | } |
0421a189 | 2825 | (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; |
e50e5129 AD |
2826 | return 0; |
2827 | } | |
2828 | ||
ac27a0ec | 2829 | /* |
617ba13b | 2830 | * ext4_xattr_delete_inode() |
ac27a0ec | 2831 | * |
e50e5129 | 2832 | * Free extended attribute resources associated with this inode. Traverse |
dec214d0 TE |
2833 | * all entries and decrement reference on any xattr inodes associated with this |
2834 | * inode. This is called immediately before an inode is freed. We have exclusive | |
2835 | * access to the inode. If an orphan inode is deleted it will also release its | |
2836 | * references on xattr block and xattr inodes. | |
ac27a0ec | 2837 | */ |
dec214d0 TE |
2838 | int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, |
2839 | struct ext4_xattr_inode_array **ea_inode_array, | |
2840 | int extra_credits) | |
ac27a0ec DK |
2841 | { |
2842 | struct buffer_head *bh = NULL; | |
e50e5129 | 2843 | struct ext4_xattr_ibody_header *header; |
30a7eb97 | 2844 | struct ext4_iloc iloc = { .bh = NULL }; |
dec214d0 | 2845 | struct ext4_xattr_entry *entry; |
a6d05676 | 2846 | struct inode *ea_inode; |
30a7eb97 TE |
2847 | int error; |
2848 | ||
2849 | error = ext4_xattr_ensure_credits(handle, inode, extra_credits, | |
2850 | NULL /* bh */, | |
2851 | false /* dirty */, | |
2852 | false /* block_csum */); | |
2853 | if (error) { | |
2854 | EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); | |
2855 | goto cleanup; | |
2856 | } | |
ac27a0ec | 2857 | |
dec214d0 TE |
2858 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2859 | ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
e50e5129 | 2860 | |
dec214d0 TE |
2861 | error = ext4_get_inode_loc(inode, &iloc); |
2862 | if (error) { | |
2863 | EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); | |
2864 | goto cleanup; | |
2865 | } | |
30a7eb97 | 2866 | |
dec214d0 TE |
2867 | error = ext4_journal_get_write_access(handle, iloc.bh); |
2868 | if (error) { | |
2869 | EXT4_ERROR_INODE(inode, "write access (error %d)", | |
2870 | error); | |
2871 | goto cleanup; | |
2872 | } | |
e50e5129 | 2873 | |
dec214d0 TE |
2874 | header = IHDR(inode, ext4_raw_inode(&iloc)); |
2875 | if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) | |
2876 | ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, | |
2877 | IFIRST(header), | |
2878 | false /* block_csum */, | |
2879 | ea_inode_array, | |
2880 | extra_credits, | |
2881 | false /* skip_quota */); | |
ac27a0ec | 2882 | } |
e50e5129 | 2883 | |
dec214d0 TE |
2884 | if (EXT4_I(inode)->i_file_acl) { |
2885 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
2886 | if (!bh) { | |
2887 | EXT4_ERROR_INODE(inode, "block %llu read error", | |
30a7eb97 | 2888 | EXT4_I(inode)->i_file_acl); |
dec214d0 TE |
2889 | error = -EIO; |
2890 | goto cleanup; | |
2891 | } | |
2892 | error = ext4_xattr_check_block(inode, bh); | |
de05ca85 | 2893 | if (error) |
e50e5129 | 2894 | goto cleanup; |
e50e5129 | 2895 | |
dec214d0 TE |
2896 | if (ext4_has_feature_ea_inode(inode->i_sb)) { |
2897 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
a6d05676 TE |
2898 | entry = EXT4_XATTR_NEXT(entry)) { |
2899 | if (!entry->e_value_inum) | |
2900 | continue; | |
2901 | error = ext4_xattr_inode_iget(inode, | |
2902 | le32_to_cpu(entry->e_value_inum), | |
2903 | le32_to_cpu(entry->e_hash), | |
2904 | &ea_inode); | |
2905 | if (error) | |
2906 | continue; | |
2907 | ext4_xattr_inode_free_quota(inode, ea_inode, | |
dec214d0 | 2908 | le32_to_cpu(entry->e_value_size)); |
a6d05676 TE |
2909 | iput(ea_inode); |
2910 | } | |
dec214d0 TE |
2911 | |
2912 | } | |
2913 | ||
2914 | ext4_xattr_release_block(handle, inode, bh, ea_inode_array, | |
2915 | extra_credits); | |
2916 | /* | |
2917 | * Update i_file_acl value in the same transaction that releases | |
2918 | * block. | |
2919 | */ | |
2920 | EXT4_I(inode)->i_file_acl = 0; | |
2921 | error = ext4_mark_inode_dirty(handle, inode); | |
2922 | if (error) { | |
2923 | EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", | |
2924 | error); | |
2925 | goto cleanup; | |
2926 | } | |
30a7eb97 | 2927 | } |
dec214d0 | 2928 | error = 0; |
ac27a0ec | 2929 | cleanup: |
30a7eb97 | 2930 | brelse(iloc.bh); |
ac27a0ec | 2931 | brelse(bh); |
e50e5129 AD |
2932 | return error; |
2933 | } | |
2934 | ||
0421a189 | 2935 | void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) |
e50e5129 | 2936 | { |
dec214d0 | 2937 | int idx; |
e50e5129 | 2938 | |
0421a189 | 2939 | if (ea_inode_array == NULL) |
e50e5129 AD |
2940 | return; |
2941 | ||
dec214d0 TE |
2942 | for (idx = 0; idx < ea_inode_array->count; ++idx) |
2943 | iput(ea_inode_array->inodes[idx]); | |
0421a189 | 2944 | kfree(ea_inode_array); |
ac27a0ec DK |
2945 | } |
2946 | ||
ac27a0ec | 2947 | /* |
47387409 | 2948 | * ext4_xattr_block_cache_insert() |
ac27a0ec | 2949 | * |
47387409 | 2950 | * Create a new entry in the extended attribute block cache, and insert |
ac27a0ec DK |
2951 | * it unless such an entry is already in the cache. |
2952 | * | |
2953 | * Returns 0, or a negative error number on failure. | |
2954 | */ | |
2955 | static void | |
47387409 TE |
2956 | ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, |
2957 | struct buffer_head *bh) | |
ac27a0ec | 2958 | { |
6048c64b AG |
2959 | struct ext4_xattr_header *header = BHDR(bh); |
2960 | __u32 hash = le32_to_cpu(header->h_hash); | |
2961 | int reusable = le32_to_cpu(header->h_refcount) < | |
2962 | EXT4_XATTR_REFCOUNT_MAX; | |
ac27a0ec DK |
2963 | int error; |
2964 | ||
cdb7ee4c TE |
2965 | if (!ea_block_cache) |
2966 | return; | |
47387409 | 2967 | error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, |
6048c64b | 2968 | bh->b_blocknr, reusable); |
ac27a0ec | 2969 | if (error) { |
82939d79 | 2970 | if (error == -EBUSY) |
ac27a0ec | 2971 | ea_bdebug(bh, "already in cache"); |
82939d79 | 2972 | } else |
ac27a0ec | 2973 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
2974 | } |
2975 | ||
2976 | /* | |
617ba13b | 2977 | * ext4_xattr_cmp() |
ac27a0ec DK |
2978 | * |
2979 | * Compare two extended attribute blocks for equality. | |
2980 | * | |
2981 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
2982 | * a negative error number on errors. | |
2983 | */ | |
2984 | static int | |
617ba13b MC |
2985 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
2986 | struct ext4_xattr_header *header2) | |
ac27a0ec | 2987 | { |
617ba13b | 2988 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
2989 | |
2990 | entry1 = ENTRY(header1+1); | |
2991 | entry2 = ENTRY(header2+1); | |
2992 | while (!IS_LAST_ENTRY(entry1)) { | |
2993 | if (IS_LAST_ENTRY(entry2)) | |
2994 | return 1; | |
2995 | if (entry1->e_hash != entry2->e_hash || | |
2996 | entry1->e_name_index != entry2->e_name_index || | |
2997 | entry1->e_name_len != entry2->e_name_len || | |
2998 | entry1->e_value_size != entry2->e_value_size || | |
e50e5129 | 2999 | entry1->e_value_inum != entry2->e_value_inum || |
ac27a0ec DK |
3000 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) |
3001 | return 1; | |
7cec1918 TE |
3002 | if (!entry1->e_value_inum && |
3003 | memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), | |
ac27a0ec DK |
3004 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), |
3005 | le32_to_cpu(entry1->e_value_size))) | |
3006 | return 1; | |
3007 | ||
617ba13b MC |
3008 | entry1 = EXT4_XATTR_NEXT(entry1); |
3009 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
3010 | } |
3011 | if (!IS_LAST_ENTRY(entry2)) | |
3012 | return 1; | |
3013 | return 0; | |
3014 | } | |
3015 | ||
3016 | /* | |
47387409 | 3017 | * ext4_xattr_block_cache_find() |
ac27a0ec DK |
3018 | * |
3019 | * Find an identical extended attribute block. | |
3020 | * | |
3021 | * Returns a pointer to the block found, or NULL if such a block was | |
3022 | * not found or an error occurred. | |
3023 | */ | |
3024 | static struct buffer_head * | |
47387409 TE |
3025 | ext4_xattr_block_cache_find(struct inode *inode, |
3026 | struct ext4_xattr_header *header, | |
3027 | struct mb_cache_entry **pce) | |
ac27a0ec DK |
3028 | { |
3029 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 | 3030 | struct mb_cache_entry *ce; |
47387409 | 3031 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec | 3032 | |
cdb7ee4c TE |
3033 | if (!ea_block_cache) |
3034 | return NULL; | |
ac27a0ec DK |
3035 | if (!header->h_hash) |
3036 | return NULL; /* never share */ | |
3037 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
47387409 | 3038 | ce = mb_cache_entry_find_first(ea_block_cache, hash); |
ac27a0ec DK |
3039 | while (ce) { |
3040 | struct buffer_head *bh; | |
3041 | ||
c07dfcb4 | 3042 | bh = sb_bread(inode->i_sb, ce->e_value); |
ac27a0ec | 3043 | if (!bh) { |
24676da4 | 3044 | EXT4_ERROR_INODE(inode, "block %lu read error", |
c07dfcb4 | 3045 | (unsigned long)ce->e_value); |
617ba13b | 3046 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
ac27a0ec DK |
3047 | *pce = ce; |
3048 | return bh; | |
3049 | } | |
3050 | brelse(bh); | |
47387409 | 3051 | ce = mb_cache_entry_find_next(ea_block_cache, ce); |
ac27a0ec DK |
3052 | } |
3053 | return NULL; | |
3054 | } | |
3055 | ||
3056 | #define NAME_HASH_SHIFT 5 | |
3057 | #define VALUE_HASH_SHIFT 16 | |
3058 | ||
3059 | /* | |
617ba13b | 3060 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
3061 | * |
3062 | * Compute the hash of an extended attribute. | |
3063 | */ | |
b9fc761e TE |
3064 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
3065 | size_t value_count) | |
ac27a0ec DK |
3066 | { |
3067 | __u32 hash = 0; | |
ac27a0ec | 3068 | |
b9fc761e | 3069 | while (name_len--) { |
ac27a0ec DK |
3070 | hash = (hash << NAME_HASH_SHIFT) ^ |
3071 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
3072 | *name++; | |
3073 | } | |
b9fc761e TE |
3074 | while (value_count--) { |
3075 | hash = (hash << VALUE_HASH_SHIFT) ^ | |
3076 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
3077 | le32_to_cpu(*value++); | |
ac27a0ec | 3078 | } |
b9fc761e | 3079 | return cpu_to_le32(hash); |
ac27a0ec DK |
3080 | } |
3081 | ||
3082 | #undef NAME_HASH_SHIFT | |
3083 | #undef VALUE_HASH_SHIFT | |
3084 | ||
3085 | #define BLOCK_HASH_SHIFT 16 | |
3086 | ||
3087 | /* | |
617ba13b | 3088 | * ext4_xattr_rehash() |
ac27a0ec DK |
3089 | * |
3090 | * Re-compute the extended attribute hash value after an entry has changed. | |
3091 | */ | |
daf83281 | 3092 | static void ext4_xattr_rehash(struct ext4_xattr_header *header) |
ac27a0ec | 3093 | { |
617ba13b | 3094 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
3095 | __u32 hash = 0; |
3096 | ||
ac27a0ec DK |
3097 | here = ENTRY(header+1); |
3098 | while (!IS_LAST_ENTRY(here)) { | |
3099 | if (!here->e_hash) { | |
3100 | /* Block is not shared if an entry's hash value == 0 */ | |
3101 | hash = 0; | |
3102 | break; | |
3103 | } | |
3104 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
3105 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
3106 | le32_to_cpu(here->e_hash); | |
617ba13b | 3107 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
3108 | } |
3109 | header->h_hash = cpu_to_le32(hash); | |
3110 | } | |
3111 | ||
3112 | #undef BLOCK_HASH_SHIFT | |
3113 | ||
9c191f70 M |
3114 | #define HASH_BUCKET_BITS 10 |
3115 | ||
7a2508e1 | 3116 | struct mb_cache * |
82939d79 | 3117 | ext4_xattr_create_cache(void) |
ac27a0ec | 3118 | { |
7a2508e1 | 3119 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
3120 | } |
3121 | ||
7a2508e1 | 3122 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 3123 | { |
9c191f70 | 3124 | if (cache) |
7a2508e1 | 3125 | mb_cache_destroy(cache); |
ac27a0ec | 3126 | } |
9c191f70 | 3127 |