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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ac27a0ec | 2 | /* |
617ba13b | 3 | * linux/fs/ext4/xattr.c |
ac27a0ec DK |
4 | * |
5 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> | |
6 | * | |
7 | * Fix by Harrison Xing <harrison@mountainviewdata.com>. | |
617ba13b | 8 | * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>. |
ac27a0ec DK |
9 | * Extended attributes for symlinks and special files added per |
10 | * suggestion of Luka Renko <luka.renko@hermes.si>. | |
11 | * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, | |
12 | * Red Hat Inc. | |
13 | * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz | |
14 | * and Andreas Gruenbacher <agruen@suse.de>. | |
15 | */ | |
16 | ||
17 | /* | |
18 | * Extended attributes are stored directly in inodes (on file systems with | |
19 | * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl | |
20 | * field contains the block number if an inode uses an additional block. All | |
21 | * attributes must fit in the inode and one additional block. Blocks that | |
22 | * contain the identical set of attributes may be shared among several inodes. | |
23 | * Identical blocks are detected by keeping a cache of blocks that have | |
24 | * recently been accessed. | |
25 | * | |
26 | * The attributes in inodes and on blocks have a different header; the entries | |
27 | * are stored in the same format: | |
28 | * | |
29 | * +------------------+ | |
30 | * | header | | |
31 | * | entry 1 | | | |
32 | * | entry 2 | | growing downwards | |
33 | * | entry 3 | v | |
34 | * | four null bytes | | |
35 | * | . . . | | |
36 | * | value 1 | ^ | |
37 | * | value 3 | | growing upwards | |
38 | * | value 2 | | | |
39 | * +------------------+ | |
40 | * | |
41 | * The header is followed by multiple entry descriptors. In disk blocks, the | |
42 | * entry descriptors are kept sorted. In inodes, they are unsorted. The | |
43 | * attribute values are aligned to the end of the block in no specific order. | |
44 | * | |
45 | * Locking strategy | |
46 | * ---------------- | |
617ba13b | 47 | * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem. |
ac27a0ec DK |
48 | * EA blocks are only changed if they are exclusive to an inode, so |
49 | * holding xattr_sem also means that nothing but the EA block's reference | |
50 | * count can change. Multiple writers to the same block are synchronized | |
51 | * by the buffer lock. | |
52 | */ | |
53 | ||
54 | #include <linux/init.h> | |
55 | #include <linux/fs.h> | |
56 | #include <linux/slab.h> | |
7a2508e1 | 57 | #include <linux/mbcache.h> |
ac27a0ec | 58 | #include <linux/quotaops.h> |
ee73f9a5 | 59 | #include <linux/iversion.h> |
3dcf5451 CH |
60 | #include "ext4_jbd2.h" |
61 | #include "ext4.h" | |
ac27a0ec DK |
62 | #include "xattr.h" |
63 | #include "acl.h" | |
64 | ||
617ba13b | 65 | #ifdef EXT4_XATTR_DEBUG |
d74f3d25 JP |
66 | # define ea_idebug(inode, fmt, ...) \ |
67 | printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \ | |
68 | inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__) | |
69 | # define ea_bdebug(bh, fmt, ...) \ | |
70 | printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \ | |
71 | bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__) | |
ac27a0ec | 72 | #else |
ace36ad4 JP |
73 | # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
74 | # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) | |
ac27a0ec DK |
75 | #endif |
76 | ||
47387409 TE |
77 | static void ext4_xattr_block_cache_insert(struct mb_cache *, |
78 | struct buffer_head *); | |
79 | static struct buffer_head * | |
80 | ext4_xattr_block_cache_find(struct inode *, struct ext4_xattr_header *, | |
81 | struct mb_cache_entry **); | |
b9fc761e TE |
82 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
83 | size_t value_count); | |
daf83281 | 84 | static void ext4_xattr_rehash(struct ext4_xattr_header *); |
ac27a0ec | 85 | |
d6006186 | 86 | static const struct xattr_handler * const ext4_xattr_handler_map[] = { |
617ba13b | 87 | [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, |
03010a33 | 88 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
89 | [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
90 | [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, | |
ac27a0ec | 91 | #endif |
617ba13b | 92 | [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, |
03010a33 | 93 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 94 | [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, |
ac27a0ec DK |
95 | #endif |
96 | }; | |
97 | ||
11e27528 | 98 | const struct xattr_handler *ext4_xattr_handlers[] = { |
617ba13b MC |
99 | &ext4_xattr_user_handler, |
100 | &ext4_xattr_trusted_handler, | |
03010a33 | 101 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
102 | &posix_acl_access_xattr_handler, |
103 | &posix_acl_default_xattr_handler, | |
ac27a0ec | 104 | #endif |
03010a33 | 105 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 106 | &ext4_xattr_security_handler, |
ac27a0ec DK |
107 | #endif |
108 | NULL | |
109 | }; | |
110 | ||
47387409 TE |
111 | #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ |
112 | inode->i_sb->s_fs_info)->s_ea_block_cache) | |
9c191f70 | 113 | |
dec214d0 TE |
114 | #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ |
115 | inode->i_sb->s_fs_info)->s_ea_inode_cache) | |
116 | ||
30a7eb97 TE |
117 | static int |
118 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, | |
119 | struct inode *inode); | |
120 | ||
33d201e0 TE |
121 | #ifdef CONFIG_LOCKDEP |
122 | void ext4_xattr_inode_set_class(struct inode *ea_inode) | |
123 | { | |
124 | lockdep_set_subclass(&ea_inode->i_rwsem, 1); | |
125 | } | |
126 | #endif | |
127 | ||
cc8e94fd DW |
128 | static __le32 ext4_xattr_block_csum(struct inode *inode, |
129 | sector_t block_nr, | |
130 | struct ext4_xattr_header *hdr) | |
131 | { | |
132 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
d6a77105 | 133 | __u32 csum; |
d6a77105 | 134 | __le64 dsk_block_nr = cpu_to_le64(block_nr); |
b47820ed DJ |
135 | __u32 dummy_csum = 0; |
136 | int offset = offsetof(struct ext4_xattr_header, h_checksum); | |
cc8e94fd | 137 | |
d6a77105 TT |
138 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, |
139 | sizeof(dsk_block_nr)); | |
b47820ed DJ |
140 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); |
141 | csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); | |
142 | offset += sizeof(dummy_csum); | |
143 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, | |
144 | EXT4_BLOCK_SIZE(inode->i_sb) - offset); | |
41eb70dd | 145 | |
cc8e94fd DW |
146 | return cpu_to_le32(csum); |
147 | } | |
148 | ||
149 | static int ext4_xattr_block_csum_verify(struct inode *inode, | |
dac7a4b4 | 150 | struct buffer_head *bh) |
cc8e94fd | 151 | { |
dac7a4b4 TT |
152 | struct ext4_xattr_header *hdr = BHDR(bh); |
153 | int ret = 1; | |
cc8e94fd | 154 | |
dac7a4b4 TT |
155 | if (ext4_has_metadata_csum(inode->i_sb)) { |
156 | lock_buffer(bh); | |
157 | ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, | |
158 | bh->b_blocknr, hdr)); | |
159 | unlock_buffer(bh); | |
160 | } | |
161 | return ret; | |
cc8e94fd DW |
162 | } |
163 | ||
dac7a4b4 TT |
164 | static void ext4_xattr_block_csum_set(struct inode *inode, |
165 | struct buffer_head *bh) | |
cc8e94fd | 166 | { |
dac7a4b4 TT |
167 | if (ext4_has_metadata_csum(inode->i_sb)) |
168 | BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, | |
169 | bh->b_blocknr, BHDR(bh)); | |
cc8e94fd DW |
170 | } |
171 | ||
11e27528 | 172 | static inline const struct xattr_handler * |
617ba13b | 173 | ext4_xattr_handler(int name_index) |
ac27a0ec | 174 | { |
11e27528 | 175 | const struct xattr_handler *handler = NULL; |
ac27a0ec | 176 | |
617ba13b MC |
177 | if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
178 | handler = ext4_xattr_handler_map[name_index]; | |
ac27a0ec DK |
179 | return handler; |
180 | } | |
181 | ||
ac27a0ec | 182 | static int |
2c4f9923 EB |
183 | ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, |
184 | void *value_start) | |
ac27a0ec | 185 | { |
a0626e75 DW |
186 | struct ext4_xattr_entry *e = entry; |
187 | ||
d7614cc1 | 188 | /* Find the end of the names list */ |
a0626e75 DW |
189 | while (!IS_LAST_ENTRY(e)) { |
190 | struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); | |
ac27a0ec | 191 | if ((void *)next >= end) |
6a797d27 | 192 | return -EFSCORRUPTED; |
7d95178c TT |
193 | if (strnlen(e->e_name, e->e_name_len) != e->e_name_len) |
194 | return -EFSCORRUPTED; | |
a0626e75 | 195 | e = next; |
ac27a0ec | 196 | } |
a0626e75 | 197 | |
d7614cc1 | 198 | /* Check the values */ |
a0626e75 | 199 | while (!IS_LAST_ENTRY(entry)) { |
ce3fd194 EB |
200 | u32 size = le32_to_cpu(entry->e_value_size); |
201 | ||
54dd0e0a | 202 | if (size > EXT4_XATTR_SIZE_MAX) |
ce3fd194 EB |
203 | return -EFSCORRUPTED; |
204 | ||
205 | if (size != 0 && entry->e_value_inum == 0) { | |
d7614cc1 | 206 | u16 offs = le16_to_cpu(entry->e_value_offs); |
d7614cc1 EB |
207 | void *value; |
208 | ||
209 | /* | |
210 | * The value cannot overlap the names, and the value | |
211 | * with padding cannot extend beyond 'end'. Check both | |
212 | * the padded and unpadded sizes, since the size may | |
213 | * overflow to 0 when adding padding. | |
214 | */ | |
215 | if (offs > end - value_start) | |
216 | return -EFSCORRUPTED; | |
217 | value = value_start + offs; | |
218 | if (value < (void *)e + sizeof(u32) || | |
219 | size > end - value || | |
220 | EXT4_XATTR_SIZE(size) > end - value) | |
221 | return -EFSCORRUPTED; | |
222 | } | |
a0626e75 DW |
223 | entry = EXT4_XATTR_NEXT(entry); |
224 | } | |
225 | ||
ac27a0ec DK |
226 | return 0; |
227 | } | |
228 | ||
229 | static inline int | |
de05ca85 TT |
230 | __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh, |
231 | const char *function, unsigned int line) | |
ac27a0ec | 232 | { |
de05ca85 | 233 | int error = -EFSCORRUPTED; |
cc8e94fd | 234 | |
617ba13b | 235 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 236 | BHDR(bh)->h_blocks != cpu_to_le32(1)) |
de05ca85 | 237 | goto errout; |
513f86d7 TT |
238 | if (buffer_verified(bh)) |
239 | return 0; | |
240 | ||
de05ca85 | 241 | error = -EFSBADCRC; |
dac7a4b4 | 242 | if (!ext4_xattr_block_csum_verify(inode, bh)) |
de05ca85 | 243 | goto errout; |
2c4f9923 EB |
244 | error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, |
245 | bh->b_data); | |
de05ca85 TT |
246 | errout: |
247 | if (error) | |
248 | __ext4_error_inode(inode, function, line, 0, | |
249 | "corrupted xattr block %llu", | |
250 | (unsigned long long) bh->b_blocknr); | |
251 | else | |
cc8e94fd DW |
252 | set_buffer_verified(bh); |
253 | return error; | |
ac27a0ec DK |
254 | } |
255 | ||
de05ca85 TT |
256 | #define ext4_xattr_check_block(inode, bh) \ |
257 | __ext4_xattr_check_block((inode), (bh), __func__, __LINE__) | |
258 | ||
259 | ||
9e92f48c TT |
260 | static int |
261 | __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, | |
262 | void *end, const char *function, unsigned int line) | |
263 | { | |
9e92f48c TT |
264 | int error = -EFSCORRUPTED; |
265 | ||
290ab230 | 266 | if (end - (void *)header < sizeof(*header) + sizeof(u32) || |
19962509 | 267 | (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) |
9e92f48c | 268 | goto errout; |
2c4f9923 | 269 | error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); |
9e92f48c TT |
270 | errout: |
271 | if (error) | |
272 | __ext4_error_inode(inode, function, line, 0, | |
273 | "corrupted in-inode xattr"); | |
274 | return error; | |
275 | } | |
276 | ||
277 | #define xattr_check_inode(inode, header, end) \ | |
278 | __xattr_check_inode((inode), (header), (end), __func__, __LINE__) | |
279 | ||
ac27a0ec | 280 | static int |
9496005d TT |
281 | xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry, |
282 | void *end, int name_index, const char *name, int sorted) | |
ac27a0ec | 283 | { |
9496005d | 284 | struct ext4_xattr_entry *entry, *next; |
ac27a0ec DK |
285 | size_t name_len; |
286 | int cmp = 1; | |
287 | ||
288 | if (name == NULL) | |
289 | return -EINVAL; | |
290 | name_len = strlen(name); | |
9496005d TT |
291 | for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) { |
292 | next = EXT4_XATTR_NEXT(entry); | |
293 | if ((void *) next >= end) { | |
294 | EXT4_ERROR_INODE(inode, "corrupted xattr entries"); | |
295 | return -EFSCORRUPTED; | |
296 | } | |
ac27a0ec DK |
297 | cmp = name_index - entry->e_name_index; |
298 | if (!cmp) | |
299 | cmp = name_len - entry->e_name_len; | |
300 | if (!cmp) | |
301 | cmp = memcmp(name, entry->e_name, name_len); | |
302 | if (cmp <= 0 && (sorted || cmp == 0)) | |
303 | break; | |
304 | } | |
305 | *pentry = entry; | |
ac27a0ec DK |
306 | return cmp ? -ENODATA : 0; |
307 | } | |
308 | ||
dec214d0 TE |
309 | static u32 |
310 | ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) | |
311 | { | |
312 | return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); | |
313 | } | |
314 | ||
315 | static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) | |
316 | { | |
317 | return ((u64)ea_inode->i_ctime.tv_sec << 32) | | |
ee73f9a5 | 318 | (u32) inode_peek_iversion_raw(ea_inode); |
dec214d0 TE |
319 | } |
320 | ||
321 | static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) | |
322 | { | |
323 | ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); | |
ee73f9a5 | 324 | inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); |
dec214d0 TE |
325 | } |
326 | ||
327 | static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) | |
328 | { | |
329 | return (u32)ea_inode->i_atime.tv_sec; | |
330 | } | |
331 | ||
332 | static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) | |
333 | { | |
334 | ea_inode->i_atime.tv_sec = hash; | |
335 | } | |
336 | ||
e50e5129 AD |
337 | /* |
338 | * Read the EA value from an inode. | |
339 | */ | |
90966693 | 340 | static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) |
e50e5129 | 341 | { |
9699d4f9 TE |
342 | int blocksize = 1 << ea_inode->i_blkbits; |
343 | int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; | |
344 | int tail_size = (size % blocksize) ?: blocksize; | |
345 | struct buffer_head *bhs_inline[8]; | |
346 | struct buffer_head **bhs = bhs_inline; | |
347 | int i, ret; | |
348 | ||
349 | if (bh_count > ARRAY_SIZE(bhs_inline)) { | |
350 | bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); | |
351 | if (!bhs) | |
352 | return -ENOMEM; | |
353 | } | |
90966693 | 354 | |
9699d4f9 TE |
355 | ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, |
356 | true /* wait */, bhs); | |
357 | if (ret) | |
358 | goto free_bhs; | |
e50e5129 | 359 | |
9699d4f9 TE |
360 | for (i = 0; i < bh_count; i++) { |
361 | /* There shouldn't be any holes in ea_inode. */ | |
362 | if (!bhs[i]) { | |
363 | ret = -EFSCORRUPTED; | |
364 | goto put_bhs; | |
365 | } | |
366 | memcpy((char *)buf + blocksize * i, bhs[i]->b_data, | |
367 | i < bh_count - 1 ? blocksize : tail_size); | |
e50e5129 | 368 | } |
9699d4f9 TE |
369 | ret = 0; |
370 | put_bhs: | |
371 | for (i = 0; i < bh_count; i++) | |
372 | brelse(bhs[i]); | |
373 | free_bhs: | |
374 | if (bhs != bhs_inline) | |
375 | kfree(bhs); | |
376 | return ret; | |
e50e5129 AD |
377 | } |
378 | ||
a6d05676 TE |
379 | #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) |
380 | ||
bab79b04 | 381 | static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, |
a6d05676 | 382 | u32 ea_inode_hash, struct inode **ea_inode) |
e50e5129 | 383 | { |
bab79b04 TE |
384 | struct inode *inode; |
385 | int err; | |
e50e5129 | 386 | |
8a363970 | 387 | inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_NORMAL); |
bab79b04 TE |
388 | if (IS_ERR(inode)) { |
389 | err = PTR_ERR(inode); | |
dec214d0 TE |
390 | ext4_error(parent->i_sb, |
391 | "error while reading EA inode %lu err=%d", ea_ino, | |
392 | err); | |
bab79b04 | 393 | return err; |
e50e5129 AD |
394 | } |
395 | ||
bab79b04 | 396 | if (is_bad_inode(inode)) { |
dec214d0 TE |
397 | ext4_error(parent->i_sb, |
398 | "error while reading EA inode %lu is_bad_inode", | |
399 | ea_ino); | |
bab79b04 TE |
400 | err = -EIO; |
401 | goto error; | |
402 | } | |
403 | ||
bab79b04 | 404 | if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { |
dec214d0 TE |
405 | ext4_error(parent->i_sb, |
406 | "EA inode %lu does not have EXT4_EA_INODE_FL flag", | |
407 | ea_ino); | |
bab79b04 | 408 | err = -EINVAL; |
e50e5129 AD |
409 | goto error; |
410 | } | |
411 | ||
a6d05676 TE |
412 | ext4_xattr_inode_set_class(inode); |
413 | ||
414 | /* | |
415 | * Check whether this is an old Lustre-style xattr inode. Lustre | |
416 | * implementation does not have hash validation, rather it has a | |
417 | * backpointer from ea_inode to the parent inode. | |
418 | */ | |
419 | if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && | |
420 | EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && | |
421 | inode->i_generation == parent->i_generation) { | |
422 | ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); | |
423 | ext4_xattr_inode_set_ref(inode, 1); | |
424 | } else { | |
425 | inode_lock(inode); | |
426 | inode->i_flags |= S_NOQUOTA; | |
427 | inode_unlock(inode); | |
428 | } | |
429 | ||
bab79b04 TE |
430 | *ea_inode = inode; |
431 | return 0; | |
e50e5129 | 432 | error: |
bab79b04 TE |
433 | iput(inode); |
434 | return err; | |
e50e5129 AD |
435 | } |
436 | ||
dec214d0 | 437 | static int |
b9fc761e TE |
438 | ext4_xattr_inode_verify_hashes(struct inode *ea_inode, |
439 | struct ext4_xattr_entry *entry, void *buffer, | |
440 | size_t size) | |
dec214d0 TE |
441 | { |
442 | u32 hash; | |
443 | ||
444 | /* Verify stored hash matches calculated hash. */ | |
445 | hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); | |
446 | if (hash != ext4_xattr_inode_get_hash(ea_inode)) | |
447 | return -EFSCORRUPTED; | |
b9fc761e TE |
448 | |
449 | if (entry) { | |
450 | __le32 e_hash, tmp_data; | |
451 | ||
452 | /* Verify entry hash. */ | |
453 | tmp_data = cpu_to_le32(hash); | |
454 | e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, | |
455 | &tmp_data, 1); | |
456 | if (e_hash != entry->e_hash) | |
457 | return -EFSCORRUPTED; | |
458 | } | |
dec214d0 TE |
459 | return 0; |
460 | } | |
461 | ||
e50e5129 | 462 | /* |
b9fc761e | 463 | * Read xattr value from the EA inode. |
e50e5129 AD |
464 | */ |
465 | static int | |
b9fc761e TE |
466 | ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, |
467 | void *buffer, size_t size) | |
e50e5129 | 468 | { |
dec214d0 | 469 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); |
bab79b04 | 470 | struct inode *ea_inode; |
dec214d0 | 471 | int err; |
e50e5129 | 472 | |
b9fc761e | 473 | err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), |
a6d05676 | 474 | le32_to_cpu(entry->e_hash), &ea_inode); |
dec214d0 TE |
475 | if (err) { |
476 | ea_inode = NULL; | |
477 | goto out; | |
478 | } | |
e50e5129 | 479 | |
dec214d0 TE |
480 | if (i_size_read(ea_inode) != size) { |
481 | ext4_warning_inode(ea_inode, | |
482 | "ea_inode file size=%llu entry size=%zu", | |
483 | i_size_read(ea_inode), size); | |
484 | err = -EFSCORRUPTED; | |
485 | goto out; | |
486 | } | |
e50e5129 | 487 | |
dec214d0 TE |
488 | err = ext4_xattr_inode_read(ea_inode, buffer, size); |
489 | if (err) | |
490 | goto out; | |
491 | ||
a6d05676 TE |
492 | if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { |
493 | err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, | |
494 | size); | |
495 | if (err) { | |
dec214d0 TE |
496 | ext4_warning_inode(ea_inode, |
497 | "EA inode hash validation failed"); | |
498 | goto out; | |
499 | } | |
dec214d0 | 500 | |
a6d05676 TE |
501 | if (ea_inode_cache) |
502 | mb_cache_entry_create(ea_inode_cache, GFP_NOFS, | |
503 | ext4_xattr_inode_get_hash(ea_inode), | |
504 | ea_inode->i_ino, true /* reusable */); | |
505 | } | |
dec214d0 TE |
506 | out: |
507 | iput(ea_inode); | |
508 | return err; | |
e50e5129 AD |
509 | } |
510 | ||
ac27a0ec | 511 | static int |
617ba13b | 512 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
513 | void *buffer, size_t buffer_size) |
514 | { | |
515 | struct buffer_head *bh = NULL; | |
617ba13b | 516 | struct ext4_xattr_entry *entry; |
ac27a0ec | 517 | size_t size; |
9496005d | 518 | void *end; |
ac27a0ec | 519 | int error; |
47387409 | 520 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec DK |
521 | |
522 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
523 | name_index, name, buffer, (long)buffer_size); | |
524 | ||
617ba13b | 525 | if (!EXT4_I(inode)->i_file_acl) |
fb265c9c | 526 | return -ENODATA; |
ace36ad4 JP |
527 | ea_idebug(inode, "reading block %llu", |
528 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
fb265c9c TT |
529 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
530 | if (IS_ERR(bh)) | |
531 | return PTR_ERR(bh); | |
ac27a0ec DK |
532 | ea_bdebug(bh, "b_count=%d, refcount=%d", |
533 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
de05ca85 TT |
534 | error = ext4_xattr_check_block(inode, bh); |
535 | if (error) | |
ac27a0ec | 536 | goto cleanup; |
47387409 | 537 | ext4_xattr_block_cache_insert(ea_block_cache, bh); |
ac27a0ec | 538 | entry = BFIRST(bh); |
9496005d TT |
539 | end = bh->b_data + bh->b_size; |
540 | error = xattr_find_entry(inode, &entry, end, name_index, name, 1); | |
ac27a0ec DK |
541 | if (error) |
542 | goto cleanup; | |
543 | size = le32_to_cpu(entry->e_value_size); | |
54dd0e0a TT |
544 | error = -ERANGE; |
545 | if (unlikely(size > EXT4_XATTR_SIZE_MAX)) | |
546 | goto cleanup; | |
ac27a0ec | 547 | if (buffer) { |
ac27a0ec DK |
548 | if (size > buffer_size) |
549 | goto cleanup; | |
e50e5129 | 550 | if (entry->e_value_inum) { |
b9fc761e TE |
551 | error = ext4_xattr_inode_get(inode, entry, buffer, |
552 | size); | |
e50e5129 AD |
553 | if (error) |
554 | goto cleanup; | |
555 | } else { | |
54dd0e0a TT |
556 | u16 offset = le16_to_cpu(entry->e_value_offs); |
557 | void *p = bh->b_data + offset; | |
558 | ||
559 | if (unlikely(p + size > end)) | |
560 | goto cleanup; | |
561 | memcpy(buffer, p, size); | |
e50e5129 | 562 | } |
ac27a0ec DK |
563 | } |
564 | error = size; | |
565 | ||
566 | cleanup: | |
567 | brelse(bh); | |
568 | return error; | |
569 | } | |
570 | ||
879b3825 | 571 | int |
617ba13b | 572 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
573 | void *buffer, size_t buffer_size) |
574 | { | |
617ba13b MC |
575 | struct ext4_xattr_ibody_header *header; |
576 | struct ext4_xattr_entry *entry; | |
577 | struct ext4_inode *raw_inode; | |
578 | struct ext4_iloc iloc; | |
ac27a0ec DK |
579 | size_t size; |
580 | void *end; | |
581 | int error; | |
582 | ||
19f5fb7a | 583 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 584 | return -ENODATA; |
617ba13b | 585 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
586 | if (error) |
587 | return error; | |
617ba13b | 588 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 589 | header = IHDR(inode, raw_inode); |
617ba13b | 590 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 591 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
592 | if (error) |
593 | goto cleanup; | |
6ba644b9 | 594 | entry = IFIRST(header); |
9496005d | 595 | error = xattr_find_entry(inode, &entry, end, name_index, name, 0); |
ac27a0ec DK |
596 | if (error) |
597 | goto cleanup; | |
598 | size = le32_to_cpu(entry->e_value_size); | |
54dd0e0a TT |
599 | error = -ERANGE; |
600 | if (unlikely(size > EXT4_XATTR_SIZE_MAX)) | |
601 | goto cleanup; | |
ac27a0ec | 602 | if (buffer) { |
ac27a0ec DK |
603 | if (size > buffer_size) |
604 | goto cleanup; | |
e50e5129 | 605 | if (entry->e_value_inum) { |
b9fc761e TE |
606 | error = ext4_xattr_inode_get(inode, entry, buffer, |
607 | size); | |
e50e5129 AD |
608 | if (error) |
609 | goto cleanup; | |
610 | } else { | |
54dd0e0a TT |
611 | u16 offset = le16_to_cpu(entry->e_value_offs); |
612 | void *p = (void *)IFIRST(header) + offset; | |
613 | ||
614 | if (unlikely(p + size > end)) | |
615 | goto cleanup; | |
616 | memcpy(buffer, p, size); | |
e50e5129 | 617 | } |
ac27a0ec DK |
618 | } |
619 | error = size; | |
620 | ||
621 | cleanup: | |
622 | brelse(iloc.bh); | |
623 | return error; | |
624 | } | |
625 | ||
626 | /* | |
617ba13b | 627 | * ext4_xattr_get() |
ac27a0ec DK |
628 | * |
629 | * Copy an extended attribute into the buffer | |
630 | * provided, or compute the buffer size required. | |
631 | * Buffer is NULL to compute the size of the buffer required. | |
632 | * | |
633 | * Returns a negative error number on failure, or the number of bytes | |
634 | * used / required on success. | |
635 | */ | |
636 | int | |
617ba13b | 637 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
638 | void *buffer, size_t buffer_size) |
639 | { | |
640 | int error; | |
641 | ||
0db1ff22 TT |
642 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
643 | return -EIO; | |
644 | ||
230b8c1a ZZ |
645 | if (strlen(name) > 255) |
646 | return -ERANGE; | |
647 | ||
617ba13b MC |
648 | down_read(&EXT4_I(inode)->xattr_sem); |
649 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
650 | buffer_size); |
651 | if (error == -ENODATA) | |
617ba13b | 652 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 653 | buffer_size); |
617ba13b | 654 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
655 | return error; |
656 | } | |
657 | ||
658 | static int | |
431547b3 | 659 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
660 | char *buffer, size_t buffer_size) |
661 | { | |
662 | size_t rest = buffer_size; | |
663 | ||
617ba13b | 664 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 665 | const struct xattr_handler *handler = |
617ba13b | 666 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec | 667 | |
764a5c6b AG |
668 | if (handler && (!handler->list || handler->list(dentry))) { |
669 | const char *prefix = handler->prefix ?: handler->name; | |
670 | size_t prefix_len = strlen(prefix); | |
671 | size_t size = prefix_len + entry->e_name_len + 1; | |
672 | ||
ac27a0ec DK |
673 | if (buffer) { |
674 | if (size > rest) | |
675 | return -ERANGE; | |
764a5c6b AG |
676 | memcpy(buffer, prefix, prefix_len); |
677 | buffer += prefix_len; | |
678 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
679 | buffer += entry->e_name_len; | |
680 | *buffer++ = 0; | |
ac27a0ec DK |
681 | } |
682 | rest -= size; | |
683 | } | |
684 | } | |
764a5c6b | 685 | return buffer_size - rest; /* total size */ |
ac27a0ec DK |
686 | } |
687 | ||
688 | static int | |
431547b3 | 689 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 690 | { |
2b0143b5 | 691 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
692 | struct buffer_head *bh = NULL; |
693 | int error; | |
694 | ||
695 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
696 | buffer, (long)buffer_size); | |
697 | ||
617ba13b | 698 | if (!EXT4_I(inode)->i_file_acl) |
fb265c9c | 699 | return 0; |
ace36ad4 JP |
700 | ea_idebug(inode, "reading block %llu", |
701 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
fb265c9c TT |
702 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
703 | if (IS_ERR(bh)) | |
704 | return PTR_ERR(bh); | |
ac27a0ec DK |
705 | ea_bdebug(bh, "b_count=%d, refcount=%d", |
706 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
de05ca85 TT |
707 | error = ext4_xattr_check_block(inode, bh); |
708 | if (error) | |
ac27a0ec | 709 | goto cleanup; |
47387409 | 710 | ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); |
fb265c9c TT |
711 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, |
712 | buffer_size); | |
ac27a0ec DK |
713 | cleanup: |
714 | brelse(bh); | |
ac27a0ec DK |
715 | return error; |
716 | } | |
717 | ||
718 | static int | |
431547b3 | 719 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 720 | { |
2b0143b5 | 721 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
722 | struct ext4_xattr_ibody_header *header; |
723 | struct ext4_inode *raw_inode; | |
724 | struct ext4_iloc iloc; | |
ac27a0ec DK |
725 | void *end; |
726 | int error; | |
727 | ||
19f5fb7a | 728 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 729 | return 0; |
617ba13b | 730 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
731 | if (error) |
732 | return error; | |
617ba13b | 733 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 734 | header = IHDR(inode, raw_inode); |
617ba13b | 735 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 736 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
737 | if (error) |
738 | goto cleanup; | |
431547b3 | 739 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
740 | buffer, buffer_size); |
741 | ||
742 | cleanup: | |
743 | brelse(iloc.bh); | |
744 | return error; | |
745 | } | |
746 | ||
747 | /* | |
ba7ea1d8 EB |
748 | * Inode operation listxattr() |
749 | * | |
750 | * d_inode(dentry)->i_rwsem: don't care | |
ac27a0ec DK |
751 | * |
752 | * Copy a list of attribute names into the buffer | |
753 | * provided, or compute the buffer size required. | |
754 | * Buffer is NULL to compute the size of the buffer required. | |
755 | * | |
756 | * Returns a negative error number on failure, or the number of bytes | |
757 | * used / required on success. | |
758 | */ | |
ba7ea1d8 EB |
759 | ssize_t |
760 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
ac27a0ec | 761 | { |
eaeef867 | 762 | int ret, ret2; |
ac27a0ec | 763 | |
2b0143b5 | 764 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
765 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
766 | if (ret < 0) | |
767 | goto errout; | |
768 | if (buffer) { | |
769 | buffer += ret; | |
770 | buffer_size -= ret; | |
ac27a0ec | 771 | } |
eaeef867 TT |
772 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
773 | if (ret < 0) | |
774 | goto errout; | |
775 | ret += ret2; | |
776 | errout: | |
2b0143b5 | 777 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 778 | return ret; |
ac27a0ec DK |
779 | } |
780 | ||
781 | /* | |
617ba13b | 782 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
783 | * not set, set it. |
784 | */ | |
617ba13b | 785 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
786 | struct super_block *sb) |
787 | { | |
e2b911c5 | 788 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
789 | return; |
790 | ||
5d601255 | 791 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 792 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
e2b911c5 | 793 | ext4_set_feature_xattr(sb); |
a0375156 | 794 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec | 795 | } |
ac27a0ec DK |
796 | } |
797 | ||
7a9ca53a TE |
798 | int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) |
799 | { | |
800 | struct ext4_iloc iloc = { .bh = NULL }; | |
801 | struct buffer_head *bh = NULL; | |
802 | struct ext4_inode *raw_inode; | |
803 | struct ext4_xattr_ibody_header *header; | |
804 | struct ext4_xattr_entry *entry; | |
805 | qsize_t ea_inode_refs = 0; | |
806 | void *end; | |
807 | int ret; | |
808 | ||
809 | lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); | |
810 | ||
811 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
812 | ret = ext4_get_inode_loc(inode, &iloc); | |
813 | if (ret) | |
814 | goto out; | |
815 | raw_inode = ext4_raw_inode(&iloc); | |
816 | header = IHDR(inode, raw_inode); | |
817 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
818 | ret = xattr_check_inode(inode, header, end); | |
819 | if (ret) | |
820 | goto out; | |
821 | ||
822 | for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); | |
823 | entry = EXT4_XATTR_NEXT(entry)) | |
824 | if (entry->e_value_inum) | |
825 | ea_inode_refs++; | |
826 | } | |
827 | ||
828 | if (EXT4_I(inode)->i_file_acl) { | |
fb265c9c TT |
829 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
830 | if (IS_ERR(bh)) { | |
831 | ret = PTR_ERR(bh); | |
7159a986 | 832 | bh = NULL; |
7a9ca53a TE |
833 | goto out; |
834 | } | |
835 | ||
de05ca85 TT |
836 | ret = ext4_xattr_check_block(inode, bh); |
837 | if (ret) | |
7a9ca53a | 838 | goto out; |
7a9ca53a TE |
839 | |
840 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
841 | entry = EXT4_XATTR_NEXT(entry)) | |
842 | if (entry->e_value_inum) | |
843 | ea_inode_refs++; | |
844 | } | |
845 | *usage = ea_inode_refs + 1; | |
846 | ret = 0; | |
847 | out: | |
848 | brelse(iloc.bh); | |
849 | brelse(bh); | |
850 | return ret; | |
851 | } | |
852 | ||
dec214d0 TE |
853 | static inline size_t round_up_cluster(struct inode *inode, size_t length) |
854 | { | |
855 | struct super_block *sb = inode->i_sb; | |
856 | size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + | |
857 | inode->i_blkbits); | |
858 | size_t mask = ~(cluster_size - 1); | |
859 | ||
860 | return (length + cluster_size - 1) & mask; | |
861 | } | |
862 | ||
863 | static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) | |
864 | { | |
865 | int err; | |
866 | ||
867 | err = dquot_alloc_inode(inode); | |
868 | if (err) | |
869 | return err; | |
870 | err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); | |
871 | if (err) | |
872 | dquot_free_inode(inode); | |
873 | return err; | |
874 | } | |
875 | ||
a6d05676 TE |
876 | static void ext4_xattr_inode_free_quota(struct inode *parent, |
877 | struct inode *ea_inode, | |
878 | size_t len) | |
dec214d0 | 879 | { |
a6d05676 TE |
880 | if (ea_inode && |
881 | ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) | |
882 | return; | |
883 | dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); | |
884 | dquot_free_inode(parent); | |
dec214d0 TE |
885 | } |
886 | ||
af65207c TE |
887 | int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, |
888 | struct buffer_head *block_bh, size_t value_len, | |
889 | bool is_create) | |
dec214d0 | 890 | { |
dec214d0 TE |
891 | int credits; |
892 | int blocks; | |
893 | ||
894 | /* | |
895 | * 1) Owner inode update | |
896 | * 2) Ref count update on old xattr block | |
897 | * 3) new xattr block | |
898 | * 4) block bitmap update for new xattr block | |
899 | * 5) group descriptor for new xattr block | |
900 | * 6) block bitmap update for old xattr block | |
901 | * 7) group descriptor for old block | |
902 | * | |
903 | * 6 & 7 can happen if we have two racing threads T_a and T_b | |
904 | * which are each trying to set an xattr on inodes I_a and I_b | |
905 | * which were both initially sharing an xattr block. | |
906 | */ | |
907 | credits = 7; | |
908 | ||
909 | /* Quota updates. */ | |
910 | credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); | |
911 | ||
912 | /* | |
913 | * In case of inline data, we may push out the data to a block, | |
914 | * so we need to reserve credits for this eventuality | |
915 | */ | |
af65207c | 916 | if (inode && ext4_has_inline_data(inode)) |
dec214d0 TE |
917 | credits += ext4_writepage_trans_blocks(inode) + 1; |
918 | ||
919 | /* We are done if ea_inode feature is not enabled. */ | |
920 | if (!ext4_has_feature_ea_inode(sb)) | |
921 | return credits; | |
922 | ||
923 | /* New ea_inode, inode map, block bitmap, group descriptor. */ | |
924 | credits += 4; | |
925 | ||
926 | /* Data blocks. */ | |
927 | blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; | |
928 | ||
929 | /* Indirection block or one level of extent tree. */ | |
930 | blocks += 1; | |
931 | ||
932 | /* Block bitmap and group descriptor updates for each block. */ | |
933 | credits += blocks * 2; | |
934 | ||
935 | /* Blocks themselves. */ | |
936 | credits += blocks; | |
937 | ||
af65207c TE |
938 | if (!is_create) { |
939 | /* Dereference ea_inode holding old xattr value. | |
940 | * Old ea_inode, inode map, block bitmap, group descriptor. | |
941 | */ | |
942 | credits += 4; | |
dec214d0 | 943 | |
af65207c TE |
944 | /* Data blocks for old ea_inode. */ |
945 | blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; | |
dec214d0 | 946 | |
af65207c TE |
947 | /* Indirection block or one level of extent tree for old |
948 | * ea_inode. | |
949 | */ | |
950 | blocks += 1; | |
dec214d0 | 951 | |
af65207c TE |
952 | /* Block bitmap and group descriptor updates for each block. */ |
953 | credits += blocks * 2; | |
954 | } | |
dec214d0 TE |
955 | |
956 | /* We may need to clone the existing xattr block in which case we need | |
957 | * to increment ref counts for existing ea_inodes referenced by it. | |
958 | */ | |
959 | if (block_bh) { | |
960 | struct ext4_xattr_entry *entry = BFIRST(block_bh); | |
961 | ||
962 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) | |
963 | if (entry->e_value_inum) | |
964 | /* Ref count update on ea_inode. */ | |
965 | credits += 1; | |
966 | } | |
967 | return credits; | |
968 | } | |
969 | ||
dec214d0 TE |
970 | static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, |
971 | int ref_change) | |
972 | { | |
973 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); | |
974 | struct ext4_iloc iloc; | |
975 | s64 ref_count; | |
976 | u32 hash; | |
977 | int ret; | |
978 | ||
979 | inode_lock(ea_inode); | |
980 | ||
981 | ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); | |
1bfc204d | 982 | if (ret) |
dec214d0 | 983 | goto out; |
dec214d0 TE |
984 | |
985 | ref_count = ext4_xattr_inode_get_ref(ea_inode); | |
986 | ref_count += ref_change; | |
987 | ext4_xattr_inode_set_ref(ea_inode, ref_count); | |
988 | ||
989 | if (ref_change > 0) { | |
990 | WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", | |
991 | ea_inode->i_ino, ref_count); | |
992 | ||
993 | if (ref_count == 1) { | |
994 | WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", | |
995 | ea_inode->i_ino, ea_inode->i_nlink); | |
996 | ||
997 | set_nlink(ea_inode, 1); | |
998 | ext4_orphan_del(handle, ea_inode); | |
999 | ||
cdb7ee4c TE |
1000 | if (ea_inode_cache) { |
1001 | hash = ext4_xattr_inode_get_hash(ea_inode); | |
1002 | mb_cache_entry_create(ea_inode_cache, | |
1003 | GFP_NOFS, hash, | |
1004 | ea_inode->i_ino, | |
1005 | true /* reusable */); | |
1006 | } | |
dec214d0 TE |
1007 | } |
1008 | } else { | |
1009 | WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", | |
1010 | ea_inode->i_ino, ref_count); | |
1011 | ||
1012 | if (ref_count == 0) { | |
1013 | WARN_ONCE(ea_inode->i_nlink != 1, | |
1014 | "EA inode %lu i_nlink=%u", | |
1015 | ea_inode->i_ino, ea_inode->i_nlink); | |
1016 | ||
1017 | clear_nlink(ea_inode); | |
1018 | ext4_orphan_add(handle, ea_inode); | |
1019 | ||
cdb7ee4c TE |
1020 | if (ea_inode_cache) { |
1021 | hash = ext4_xattr_inode_get_hash(ea_inode); | |
1022 | mb_cache_entry_delete(ea_inode_cache, hash, | |
1023 | ea_inode->i_ino); | |
1024 | } | |
dec214d0 TE |
1025 | } |
1026 | } | |
1027 | ||
1028 | ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); | |
dec214d0 TE |
1029 | if (ret) |
1030 | ext4_warning_inode(ea_inode, | |
1031 | "ext4_mark_iloc_dirty() failed ret=%d", ret); | |
1032 | out: | |
dec214d0 TE |
1033 | inode_unlock(ea_inode); |
1034 | return ret; | |
1035 | } | |
1036 | ||
1037 | static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) | |
1038 | { | |
1039 | return ext4_xattr_inode_update_ref(handle, ea_inode, 1); | |
1040 | } | |
1041 | ||
1042 | static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) | |
1043 | { | |
1044 | return ext4_xattr_inode_update_ref(handle, ea_inode, -1); | |
1045 | } | |
1046 | ||
1047 | static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, | |
1048 | struct ext4_xattr_entry *first) | |
1049 | { | |
1050 | struct inode *ea_inode; | |
1051 | struct ext4_xattr_entry *entry; | |
1052 | struct ext4_xattr_entry *failed_entry; | |
1053 | unsigned int ea_ino; | |
1054 | int err, saved_err; | |
1055 | ||
1056 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1057 | entry = EXT4_XATTR_NEXT(entry)) { | |
1058 | if (!entry->e_value_inum) | |
1059 | continue; | |
1060 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1061 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1062 | le32_to_cpu(entry->e_hash), | |
1063 | &ea_inode); | |
dec214d0 TE |
1064 | if (err) |
1065 | goto cleanup; | |
1066 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1067 | if (err) { | |
1068 | ext4_warning_inode(ea_inode, "inc ref error %d", err); | |
1069 | iput(ea_inode); | |
1070 | goto cleanup; | |
1071 | } | |
1072 | iput(ea_inode); | |
1073 | } | |
1074 | return 0; | |
1075 | ||
1076 | cleanup: | |
1077 | saved_err = err; | |
1078 | failed_entry = entry; | |
1079 | ||
1080 | for (entry = first; entry != failed_entry; | |
1081 | entry = EXT4_XATTR_NEXT(entry)) { | |
1082 | if (!entry->e_value_inum) | |
1083 | continue; | |
1084 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1085 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1086 | le32_to_cpu(entry->e_hash), | |
1087 | &ea_inode); | |
dec214d0 TE |
1088 | if (err) { |
1089 | ext4_warning(parent->i_sb, | |
1090 | "cleanup ea_ino %u iget error %d", ea_ino, | |
1091 | err); | |
1092 | continue; | |
1093 | } | |
1094 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1095 | if (err) | |
1096 | ext4_warning_inode(ea_inode, "cleanup dec ref error %d", | |
1097 | err); | |
1098 | iput(ea_inode); | |
1099 | } | |
1100 | return saved_err; | |
1101 | } | |
1102 | ||
a4130367 JK |
1103 | static int ext4_xattr_restart_fn(handle_t *handle, struct inode *inode, |
1104 | struct buffer_head *bh, bool block_csum, bool dirty) | |
1105 | { | |
1106 | int error; | |
1107 | ||
1108 | if (bh && dirty) { | |
1109 | if (block_csum) | |
1110 | ext4_xattr_block_csum_set(inode, bh); | |
1111 | error = ext4_handle_dirty_metadata(handle, NULL, bh); | |
1112 | if (error) { | |
1113 | ext4_warning(inode->i_sb, "Handle metadata (error %d)", | |
1114 | error); | |
1115 | return error; | |
1116 | } | |
1117 | } | |
1118 | return 0; | |
1119 | } | |
1120 | ||
30a7eb97 | 1121 | static void |
dec214d0 TE |
1122 | ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, |
1123 | struct buffer_head *bh, | |
1124 | struct ext4_xattr_entry *first, bool block_csum, | |
1125 | struct ext4_xattr_inode_array **ea_inode_array, | |
1126 | int extra_credits, bool skip_quota) | |
30a7eb97 TE |
1127 | { |
1128 | struct inode *ea_inode; | |
1129 | struct ext4_xattr_entry *entry; | |
1130 | bool dirty = false; | |
1131 | unsigned int ea_ino; | |
1132 | int err; | |
1133 | int credits; | |
1134 | ||
1135 | /* One credit for dec ref on ea_inode, one for orphan list addition, */ | |
1136 | credits = 2 + extra_credits; | |
1137 | ||
1138 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1139 | entry = EXT4_XATTR_NEXT(entry)) { | |
1140 | if (!entry->e_value_inum) | |
1141 | continue; | |
1142 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1143 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1144 | le32_to_cpu(entry->e_hash), | |
1145 | &ea_inode); | |
30a7eb97 TE |
1146 | if (err) |
1147 | continue; | |
1148 | ||
1149 | err = ext4_expand_inode_array(ea_inode_array, ea_inode); | |
1150 | if (err) { | |
1151 | ext4_warning_inode(ea_inode, | |
1152 | "Expand inode array err=%d", err); | |
1153 | iput(ea_inode); | |
1154 | continue; | |
1155 | } | |
1156 | ||
a4130367 | 1157 | err = ext4_journal_ensure_credits_fn(handle, credits, credits, |
83448bdf | 1158 | ext4_free_metadata_revoke_credits(parent->i_sb, 1), |
a4130367 JK |
1159 | ext4_xattr_restart_fn(handle, parent, bh, block_csum, |
1160 | dirty)); | |
1161 | if (err < 0) { | |
30a7eb97 TE |
1162 | ext4_warning_inode(ea_inode, "Ensure credits err=%d", |
1163 | err); | |
1164 | continue; | |
1165 | } | |
a4130367 JK |
1166 | if (err > 0) { |
1167 | err = ext4_journal_get_write_access(handle, bh); | |
1168 | if (err) { | |
1169 | ext4_warning_inode(ea_inode, | |
1170 | "Re-get write access err=%d", | |
1171 | err); | |
1172 | continue; | |
1173 | } | |
1174 | } | |
30a7eb97 | 1175 | |
dec214d0 TE |
1176 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); |
1177 | if (err) { | |
1178 | ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", | |
1179 | err); | |
1180 | continue; | |
1181 | } | |
1182 | ||
1183 | if (!skip_quota) | |
a6d05676 | 1184 | ext4_xattr_inode_free_quota(parent, ea_inode, |
dec214d0 | 1185 | le32_to_cpu(entry->e_value_size)); |
30a7eb97 TE |
1186 | |
1187 | /* | |
1188 | * Forget about ea_inode within the same transaction that | |
1189 | * decrements the ref count. This avoids duplicate decrements in | |
1190 | * case the rest of the work spills over to subsequent | |
1191 | * transactions. | |
1192 | */ | |
1193 | entry->e_value_inum = 0; | |
1194 | entry->e_value_size = 0; | |
1195 | ||
1196 | dirty = true; | |
1197 | } | |
1198 | ||
1199 | if (dirty) { | |
1200 | /* | |
1201 | * Note that we are deliberately skipping csum calculation for | |
1202 | * the final update because we do not expect any journal | |
1203 | * restarts until xattr block is freed. | |
1204 | */ | |
1205 | ||
1206 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
1207 | if (err) | |
1208 | ext4_warning_inode(parent, | |
1209 | "handle dirty metadata err=%d", err); | |
1210 | } | |
1211 | } | |
1212 | ||
ac27a0ec | 1213 | /* |
ec4cb1aa JK |
1214 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
1215 | * otherwise free the block. | |
ac27a0ec DK |
1216 | */ |
1217 | static void | |
617ba13b | 1218 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
dec214d0 TE |
1219 | struct buffer_head *bh, |
1220 | struct ext4_xattr_inode_array **ea_inode_array, | |
1221 | int extra_credits) | |
ac27a0ec | 1222 | { |
47387409 | 1223 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
6048c64b | 1224 | u32 hash, ref; |
8a2bfdcb | 1225 | int error = 0; |
ac27a0ec | 1226 | |
5d601255 | 1227 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
1228 | error = ext4_journal_get_write_access(handle, bh); |
1229 | if (error) | |
1230 | goto out; | |
1231 | ||
1232 | lock_buffer(bh); | |
6048c64b AG |
1233 | hash = le32_to_cpu(BHDR(bh)->h_hash); |
1234 | ref = le32_to_cpu(BHDR(bh)->h_refcount); | |
1235 | if (ref == 1) { | |
ac27a0ec | 1236 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
1237 | /* |
1238 | * This must happen under buffer lock for | |
1239 | * ext4_xattr_block_set() to reliably detect freed block | |
1240 | */ | |
cdb7ee4c TE |
1241 | if (ea_block_cache) |
1242 | mb_cache_entry_delete(ea_block_cache, hash, | |
1243 | bh->b_blocknr); | |
ac27a0ec | 1244 | get_bh(bh); |
ec4cb1aa | 1245 | unlock_buffer(bh); |
dec214d0 TE |
1246 | |
1247 | if (ext4_has_feature_ea_inode(inode->i_sb)) | |
1248 | ext4_xattr_inode_dec_ref_all(handle, inode, bh, | |
1249 | BFIRST(bh), | |
1250 | true /* block_csum */, | |
1251 | ea_inode_array, | |
1252 | extra_credits, | |
1253 | true /* skip_quota */); | |
e6362609 TT |
1254 | ext4_free_blocks(handle, inode, bh, 0, 1, |
1255 | EXT4_FREE_BLOCKS_METADATA | | |
1256 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 1257 | } else { |
6048c64b AG |
1258 | ref--; |
1259 | BHDR(bh)->h_refcount = cpu_to_le32(ref); | |
1260 | if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { | |
1261 | struct mb_cache_entry *ce; | |
1262 | ||
cdb7ee4c TE |
1263 | if (ea_block_cache) { |
1264 | ce = mb_cache_entry_get(ea_block_cache, hash, | |
1265 | bh->b_blocknr); | |
1266 | if (ce) { | |
1267 | ce->e_reusable = 1; | |
1268 | mb_cache_entry_put(ea_block_cache, ce); | |
1269 | } | |
6048c64b AG |
1270 | } |
1271 | } | |
1272 | ||
dac7a4b4 | 1273 | ext4_xattr_block_csum_set(inode, bh); |
ec4cb1aa JK |
1274 | /* |
1275 | * Beware of this ugliness: Releasing of xattr block references | |
1276 | * from different inodes can race and so we have to protect | |
1277 | * from a race where someone else frees the block (and releases | |
1278 | * its journal_head) before we are done dirtying the buffer. In | |
1279 | * nojournal mode this race is harmless and we actually cannot | |
dac7a4b4 | 1280 | * call ext4_handle_dirty_metadata() with locked buffer as |
ec4cb1aa JK |
1281 | * that function can call sync_dirty_buffer() so for that case |
1282 | * we handle the dirtying after unlocking the buffer. | |
1283 | */ | |
1284 | if (ext4_handle_valid(handle)) | |
dac7a4b4 | 1285 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
c1bb05a6 | 1286 | unlock_buffer(bh); |
ec4cb1aa | 1287 | if (!ext4_handle_valid(handle)) |
dac7a4b4 | 1288 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
8a2bfdcb | 1289 | if (IS_SYNC(inode)) |
0390131b | 1290 | ext4_handle_sync(handle); |
1231b3a1 | 1291 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
1292 | ea_bdebug(bh, "refcount now=%d; releasing", |
1293 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 1294 | } |
8a2bfdcb MC |
1295 | out: |
1296 | ext4_std_error(inode->i_sb, error); | |
1297 | return; | |
ac27a0ec DK |
1298 | } |
1299 | ||
6dd4ee7c KS |
1300 | /* |
1301 | * Find the available free space for EAs. This also returns the total number of | |
1302 | * bytes used by EA entries. | |
1303 | */ | |
1304 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
1305 | size_t *min_offs, void *base, int *total) | |
1306 | { | |
1307 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 1308 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
1309 | size_t offs = le16_to_cpu(last->e_value_offs); |
1310 | if (offs < *min_offs) | |
1311 | *min_offs = offs; | |
1312 | } | |
7b1b2c1b TT |
1313 | if (total) |
1314 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
1315 | } |
1316 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
1317 | } | |
1318 | ||
e50e5129 AD |
1319 | /* |
1320 | * Write the value of the EA in an inode. | |
1321 | */ | |
1322 | static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, | |
1323 | const void *buf, int bufsize) | |
1324 | { | |
1325 | struct buffer_head *bh = NULL; | |
1326 | unsigned long block = 0; | |
dec214d0 TE |
1327 | int blocksize = ea_inode->i_sb->s_blocksize; |
1328 | int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; | |
e50e5129 AD |
1329 | int csize, wsize = 0; |
1330 | int ret = 0; | |
1331 | int retries = 0; | |
1332 | ||
1333 | retry: | |
1334 | while (ret >= 0 && ret < max_blocks) { | |
1335 | struct ext4_map_blocks map; | |
1336 | map.m_lblk = block += ret; | |
1337 | map.m_len = max_blocks -= ret; | |
1338 | ||
1339 | ret = ext4_map_blocks(handle, ea_inode, &map, | |
1340 | EXT4_GET_BLOCKS_CREATE); | |
1341 | if (ret <= 0) { | |
1342 | ext4_mark_inode_dirty(handle, ea_inode); | |
1343 | if (ret == -ENOSPC && | |
1344 | ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { | |
1345 | ret = 0; | |
1346 | goto retry; | |
1347 | } | |
1348 | break; | |
1349 | } | |
1350 | } | |
1351 | ||
1352 | if (ret < 0) | |
1353 | return ret; | |
1354 | ||
1355 | block = 0; | |
1356 | while (wsize < bufsize) { | |
1357 | if (bh != NULL) | |
1358 | brelse(bh); | |
1359 | csize = (bufsize - wsize) > blocksize ? blocksize : | |
1360 | bufsize - wsize; | |
1361 | bh = ext4_getblk(handle, ea_inode, block, 0); | |
1362 | if (IS_ERR(bh)) | |
1363 | return PTR_ERR(bh); | |
eb6984fa VA |
1364 | if (!bh) { |
1365 | WARN_ON_ONCE(1); | |
1366 | EXT4_ERROR_INODE(ea_inode, | |
1367 | "ext4_getblk() return bh = NULL"); | |
1368 | return -EFSCORRUPTED; | |
1369 | } | |
e50e5129 AD |
1370 | ret = ext4_journal_get_write_access(handle, bh); |
1371 | if (ret) | |
1372 | goto out; | |
1373 | ||
1374 | memcpy(bh->b_data, buf, csize); | |
1375 | set_buffer_uptodate(bh); | |
1376 | ext4_handle_dirty_metadata(handle, ea_inode, bh); | |
1377 | ||
1378 | buf += csize; | |
1379 | wsize += csize; | |
1380 | block += 1; | |
1381 | } | |
1382 | ||
1383 | inode_lock(ea_inode); | |
1384 | i_size_write(ea_inode, wsize); | |
1385 | ext4_update_i_disksize(ea_inode, wsize); | |
1386 | inode_unlock(ea_inode); | |
1387 | ||
1388 | ext4_mark_inode_dirty(handle, ea_inode); | |
1389 | ||
1390 | out: | |
1391 | brelse(bh); | |
1392 | ||
1393 | return ret; | |
1394 | } | |
1395 | ||
1396 | /* | |
1397 | * Create an inode to store the value of a large EA. | |
1398 | */ | |
1399 | static struct inode *ext4_xattr_inode_create(handle_t *handle, | |
dec214d0 | 1400 | struct inode *inode, u32 hash) |
e50e5129 AD |
1401 | { |
1402 | struct inode *ea_inode = NULL; | |
9e1ba001 | 1403 | uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; |
bd3b963b | 1404 | int err; |
e50e5129 AD |
1405 | |
1406 | /* | |
1407 | * Let the next inode be the goal, so we try and allocate the EA inode | |
1408 | * in the same group, or nearby one. | |
1409 | */ | |
1410 | ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, | |
9e1ba001 | 1411 | S_IFREG | 0600, NULL, inode->i_ino + 1, owner, |
1b917ed8 | 1412 | EXT4_EA_INODE_FL); |
e50e5129 AD |
1413 | if (!IS_ERR(ea_inode)) { |
1414 | ea_inode->i_op = &ext4_file_inode_operations; | |
1415 | ea_inode->i_fop = &ext4_file_operations; | |
1416 | ext4_set_aops(ea_inode); | |
33d201e0 | 1417 | ext4_xattr_inode_set_class(ea_inode); |
e50e5129 | 1418 | unlock_new_inode(ea_inode); |
dec214d0 TE |
1419 | ext4_xattr_inode_set_ref(ea_inode, 1); |
1420 | ext4_xattr_inode_set_hash(ea_inode, hash); | |
1421 | err = ext4_mark_inode_dirty(handle, ea_inode); | |
1422 | if (!err) | |
1423 | err = ext4_inode_attach_jinode(ea_inode); | |
bd3b963b TE |
1424 | if (err) { |
1425 | iput(ea_inode); | |
1426 | return ERR_PTR(err); | |
1427 | } | |
dec214d0 TE |
1428 | |
1429 | /* | |
1430 | * Xattr inodes are shared therefore quota charging is performed | |
1431 | * at a higher level. | |
1432 | */ | |
1433 | dquot_free_inode(ea_inode); | |
1434 | dquot_drop(ea_inode); | |
1435 | inode_lock(ea_inode); | |
1436 | ea_inode->i_flags |= S_NOQUOTA; | |
1437 | inode_unlock(ea_inode); | |
e50e5129 AD |
1438 | } |
1439 | ||
1440 | return ea_inode; | |
1441 | } | |
1442 | ||
dec214d0 TE |
1443 | static struct inode * |
1444 | ext4_xattr_inode_cache_find(struct inode *inode, const void *value, | |
1445 | size_t value_len, u32 hash) | |
e50e5129 | 1446 | { |
dec214d0 TE |
1447 | struct inode *ea_inode; |
1448 | struct mb_cache_entry *ce; | |
1449 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); | |
1450 | void *ea_data; | |
1451 | ||
cdb7ee4c TE |
1452 | if (!ea_inode_cache) |
1453 | return NULL; | |
1454 | ||
dec214d0 TE |
1455 | ce = mb_cache_entry_find_first(ea_inode_cache, hash); |
1456 | if (!ce) | |
1457 | return NULL; | |
1458 | ||
71b565ce | 1459 | ea_data = kvmalloc(value_len, GFP_KERNEL); |
dec214d0 TE |
1460 | if (!ea_data) { |
1461 | mb_cache_entry_put(ea_inode_cache, ce); | |
1462 | return NULL; | |
1463 | } | |
e50e5129 | 1464 | |
dec214d0 | 1465 | while (ce) { |
8a363970 TT |
1466 | ea_inode = ext4_iget(inode->i_sb, ce->e_value, |
1467 | EXT4_IGET_NORMAL); | |
dec214d0 TE |
1468 | if (!IS_ERR(ea_inode) && |
1469 | !is_bad_inode(ea_inode) && | |
1470 | (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && | |
1471 | i_size_read(ea_inode) == value_len && | |
1472 | !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && | |
b9fc761e TE |
1473 | !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, |
1474 | value_len) && | |
dec214d0 TE |
1475 | !memcmp(value, ea_data, value_len)) { |
1476 | mb_cache_entry_touch(ea_inode_cache, ce); | |
1477 | mb_cache_entry_put(ea_inode_cache, ce); | |
1478 | kvfree(ea_data); | |
1479 | return ea_inode; | |
1480 | } | |
e50e5129 | 1481 | |
dec214d0 TE |
1482 | if (!IS_ERR(ea_inode)) |
1483 | iput(ea_inode); | |
1484 | ce = mb_cache_entry_find_next(ea_inode_cache, ce); | |
1485 | } | |
1486 | kvfree(ea_data); | |
1487 | return NULL; | |
e50e5129 AD |
1488 | } |
1489 | ||
1490 | /* | |
1491 | * Add value of the EA in an inode. | |
1492 | */ | |
dec214d0 TE |
1493 | static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, |
1494 | const void *value, size_t value_len, | |
1495 | struct inode **ret_inode) | |
e50e5129 AD |
1496 | { |
1497 | struct inode *ea_inode; | |
dec214d0 | 1498 | u32 hash; |
e50e5129 AD |
1499 | int err; |
1500 | ||
dec214d0 TE |
1501 | hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); |
1502 | ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); | |
1503 | if (ea_inode) { | |
1504 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1505 | if (err) { | |
1506 | iput(ea_inode); | |
1507 | return err; | |
1508 | } | |
1509 | ||
1510 | *ret_inode = ea_inode; | |
1511 | return 0; | |
1512 | } | |
1513 | ||
e50e5129 | 1514 | /* Create an inode for the EA value */ |
dec214d0 | 1515 | ea_inode = ext4_xattr_inode_create(handle, inode, hash); |
e50e5129 AD |
1516 | if (IS_ERR(ea_inode)) |
1517 | return PTR_ERR(ea_inode); | |
1518 | ||
1519 | err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); | |
dec214d0 TE |
1520 | if (err) { |
1521 | ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1522 | iput(ea_inode); | |
1523 | return err; | |
1524 | } | |
e50e5129 | 1525 | |
cdb7ee4c TE |
1526 | if (EA_INODE_CACHE(inode)) |
1527 | mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, | |
1528 | ea_inode->i_ino, true /* reusable */); | |
e50e5129 | 1529 | |
dec214d0 TE |
1530 | *ret_inode = ea_inode; |
1531 | return 0; | |
e50e5129 AD |
1532 | } |
1533 | ||
9c6e7853 TE |
1534 | /* |
1535 | * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode | |
1536 | * feature is enabled. | |
1537 | */ | |
1538 | #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) | |
1539 | ||
e50e5129 AD |
1540 | static int ext4_xattr_set_entry(struct ext4_xattr_info *i, |
1541 | struct ext4_xattr_search *s, | |
daf83281 TE |
1542 | handle_t *handle, struct inode *inode, |
1543 | bool is_block) | |
ac27a0ec | 1544 | { |
5369a762 | 1545 | struct ext4_xattr_entry *last, *next; |
dec214d0 TE |
1546 | struct ext4_xattr_entry *here = s->here; |
1547 | size_t min_offs = s->end - s->base, name_len = strlen(i->name); | |
e50e5129 | 1548 | int in_inode = i->in_inode; |
dec214d0 TE |
1549 | struct inode *old_ea_inode = NULL; |
1550 | struct inode *new_ea_inode = NULL; | |
1551 | size_t old_size, new_size; | |
1552 | int ret; | |
1553 | ||
1554 | /* Space used by old and new values. */ | |
1555 | old_size = (!s->not_found && !here->e_value_inum) ? | |
1556 | EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; | |
1557 | new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; | |
1558 | ||
1559 | /* | |
1560 | * Optimization for the simple case when old and new values have the | |
1561 | * same padded sizes. Not applicable if external inodes are involved. | |
1562 | */ | |
1563 | if (new_size && new_size == old_size) { | |
1564 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1565 | void *val = s->base + offs; | |
1566 | ||
1567 | here->e_value_size = cpu_to_le32(i->value_len); | |
1568 | if (i->value == EXT4_ZERO_XATTR_VALUE) { | |
1569 | memset(val, 0, new_size); | |
1570 | } else { | |
1571 | memcpy(val, i->value, i->value_len); | |
1572 | /* Clear padding bytes. */ | |
1573 | memset(val + i->value_len, 0, new_size - i->value_len); | |
1574 | } | |
32aaf194 | 1575 | goto update_hash; |
dec214d0 | 1576 | } |
e50e5129 | 1577 | |
ac27a0ec DK |
1578 | /* Compute min_offs and last. */ |
1579 | last = s->first; | |
5369a762 TT |
1580 | for (; !IS_LAST_ENTRY(last); last = next) { |
1581 | next = EXT4_XATTR_NEXT(last); | |
1582 | if ((void *)next >= s->end) { | |
1583 | EXT4_ERROR_INODE(inode, "corrupted xattr entries"); | |
1584 | ret = -EFSCORRUPTED; | |
1585 | goto out; | |
1586 | } | |
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 | ||
e5d01196 | 1679 | if (!s->not_found && here->e_value_size && !here->e_value_inum) { |
dec214d0 TE |
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. */ |
fb265c9c TT |
1802 | bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
1803 | if (IS_ERR(bs->bh)) | |
1804 | return PTR_ERR(bs->bh); | |
ac27a0ec DK |
1805 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", |
1806 | atomic_read(&(bs->bh->b_count)), | |
1807 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
de05ca85 TT |
1808 | error = ext4_xattr_check_block(inode, bs->bh); |
1809 | if (error) | |
fb265c9c | 1810 | return error; |
ac27a0ec DK |
1811 | /* Find the named attribute. */ |
1812 | bs->s.base = BHDR(bs->bh); | |
1813 | bs->s.first = BFIRST(bs->bh); | |
1814 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
1815 | bs->s.here = bs->s.first; | |
9496005d TT |
1816 | error = xattr_find_entry(inode, &bs->s.here, bs->s.end, |
1817 | i->name_index, i->name, 1); | |
ac27a0ec | 1818 | if (error && error != -ENODATA) |
fb265c9c | 1819 | return error; |
ac27a0ec DK |
1820 | bs->s.not_found = error; |
1821 | } | |
fb265c9c | 1822 | return 0; |
ac27a0ec DK |
1823 | } |
1824 | ||
1825 | static int | |
617ba13b MC |
1826 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
1827 | struct ext4_xattr_info *i, | |
1828 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1829 | { |
1830 | struct super_block *sb = inode->i_sb; | |
1831 | struct buffer_head *new_bh = NULL; | |
b347e2bc TE |
1832 | struct ext4_xattr_search s_copy = bs->s; |
1833 | struct ext4_xattr_search *s = &s_copy; | |
7a2508e1 | 1834 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 1835 | int error = 0; |
47387409 | 1836 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
a6d05676 TE |
1837 | struct inode *ea_inode = NULL, *tmp_inode; |
1838 | size_t old_ea_inode_quota = 0; | |
1839 | unsigned int ea_ino; | |
1840 | ||
ac27a0ec | 1841 | |
617ba13b | 1842 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec | 1843 | |
ac27a0ec | 1844 | if (s->base) { |
5d601255 | 1845 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
1846 | error = ext4_journal_get_write_access(handle, bs->bh); |
1847 | if (error) | |
1848 | goto cleanup; | |
1849 | lock_buffer(bs->bh); | |
1850 | ||
ac27a0ec | 1851 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
1852 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
1853 | ||
1854 | /* | |
1855 | * This must happen under buffer lock for | |
1856 | * ext4_xattr_block_set() to reliably detect modified | |
1857 | * block | |
1858 | */ | |
cdb7ee4c TE |
1859 | if (ea_block_cache) |
1860 | mb_cache_entry_delete(ea_block_cache, hash, | |
1861 | bs->bh->b_blocknr); | |
ac27a0ec | 1862 | ea_bdebug(bs->bh, "modifying in-place"); |
daf83281 TE |
1863 | error = ext4_xattr_set_entry(i, s, handle, inode, |
1864 | true /* is_block */); | |
dac7a4b4 | 1865 | ext4_xattr_block_csum_set(inode, bs->bh); |
ac27a0ec | 1866 | unlock_buffer(bs->bh); |
6a797d27 | 1867 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1868 | goto bad_block; |
1869 | if (!error) | |
dac7a4b4 TT |
1870 | error = ext4_handle_dirty_metadata(handle, |
1871 | inode, | |
1872 | bs->bh); | |
ac27a0ec DK |
1873 | if (error) |
1874 | goto cleanup; | |
1875 | goto inserted; | |
1876 | } else { | |
1877 | int offset = (char *)s->here - bs->bh->b_data; | |
1878 | ||
8a2bfdcb | 1879 | unlock_buffer(bs->bh); |
ac27a0ec | 1880 | ea_bdebug(bs->bh, "cloning"); |
216553c4 | 1881 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
1882 | error = -ENOMEM; |
1883 | if (s->base == NULL) | |
1884 | goto cleanup; | |
1885 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
1886 | s->first = ENTRY(header(s->base)+1); | |
1887 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1888 | s->here = ENTRY(s->base + offset); | |
1889 | s->end = s->base + bs->bh->b_size; | |
dec214d0 TE |
1890 | |
1891 | /* | |
1892 | * If existing entry points to an xattr inode, we need | |
1893 | * to prevent ext4_xattr_set_entry() from decrementing | |
1894 | * ref count on it because the reference belongs to the | |
1895 | * original block. In this case, make the entry look | |
1896 | * like it has an empty value. | |
1897 | */ | |
1898 | if (!s->not_found && s->here->e_value_inum) { | |
a6d05676 TE |
1899 | ea_ino = le32_to_cpu(s->here->e_value_inum); |
1900 | error = ext4_xattr_inode_iget(inode, ea_ino, | |
1901 | le32_to_cpu(s->here->e_hash), | |
1902 | &tmp_inode); | |
1903 | if (error) | |
1904 | goto cleanup; | |
1905 | ||
1906 | if (!ext4_test_inode_state(tmp_inode, | |
1907 | EXT4_STATE_LUSTRE_EA_INODE)) { | |
1908 | /* | |
1909 | * Defer quota free call for previous | |
1910 | * inode until success is guaranteed. | |
1911 | */ | |
1912 | old_ea_inode_quota = le32_to_cpu( | |
dec214d0 | 1913 | s->here->e_value_size); |
a6d05676 TE |
1914 | } |
1915 | iput(tmp_inode); | |
1916 | ||
dec214d0 TE |
1917 | s->here->e_value_inum = 0; |
1918 | s->here->e_value_size = 0; | |
1919 | } | |
ac27a0ec DK |
1920 | } |
1921 | } else { | |
1922 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 1923 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
1924 | /* assert(header == s->base) */ |
1925 | error = -ENOMEM; | |
1926 | if (s->base == NULL) | |
1927 | goto cleanup; | |
617ba13b | 1928 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
1929 | header(s->base)->h_blocks = cpu_to_le32(1); |
1930 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1931 | s->first = ENTRY(header(s->base)+1); | |
1932 | s->here = ENTRY(header(s->base)+1); | |
1933 | s->end = s->base + sb->s_blocksize; | |
1934 | } | |
1935 | ||
daf83281 | 1936 | error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); |
6a797d27 | 1937 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1938 | goto bad_block; |
1939 | if (error) | |
1940 | goto cleanup; | |
dec214d0 TE |
1941 | |
1942 | if (i->value && s->here->e_value_inum) { | |
dec214d0 TE |
1943 | /* |
1944 | * A ref count on ea_inode has been taken as part of the call to | |
1945 | * ext4_xattr_set_entry() above. We would like to drop this | |
1946 | * extra ref but we have to wait until the xattr block is | |
1947 | * initialized and has its own ref count on the ea_inode. | |
1948 | */ | |
1949 | ea_ino = le32_to_cpu(s->here->e_value_inum); | |
a6d05676 TE |
1950 | error = ext4_xattr_inode_iget(inode, ea_ino, |
1951 | le32_to_cpu(s->here->e_hash), | |
1952 | &ea_inode); | |
dec214d0 TE |
1953 | if (error) { |
1954 | ea_inode = NULL; | |
1955 | goto cleanup; | |
1956 | } | |
1957 | } | |
1958 | ||
ac27a0ec DK |
1959 | inserted: |
1960 | if (!IS_LAST_ENTRY(s->first)) { | |
47387409 TE |
1961 | new_bh = ext4_xattr_block_cache_find(inode, header(s->base), |
1962 | &ce); | |
ac27a0ec DK |
1963 | if (new_bh) { |
1964 | /* We found an identical block in the cache. */ | |
1965 | if (new_bh == bs->bh) | |
1966 | ea_bdebug(new_bh, "keeping"); | |
1967 | else { | |
6048c64b AG |
1968 | u32 ref; |
1969 | ||
b8cb5a54 TE |
1970 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
1971 | ||
ac27a0ec DK |
1972 | /* The old block is released after updating |
1973 | the inode. */ | |
1231b3a1 LC |
1974 | error = dquot_alloc_block(inode, |
1975 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 1976 | if (error) |
ac27a0ec | 1977 | goto cleanup; |
5d601255 | 1978 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 1979 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
1980 | new_bh); |
1981 | if (error) | |
1982 | goto cleanup_dquot; | |
1983 | lock_buffer(new_bh); | |
82939d79 JK |
1984 | /* |
1985 | * We have to be careful about races with | |
6048c64b AG |
1986 | * freeing, rehashing or adding references to |
1987 | * xattr block. Once we hold buffer lock xattr | |
1988 | * block's state is stable so we can check | |
1989 | * whether the block got freed / rehashed or | |
1990 | * not. Since we unhash mbcache entry under | |
1991 | * buffer lock when freeing / rehashing xattr | |
1992 | * block, checking whether entry is still | |
1993 | * hashed is reliable. Same rules hold for | |
1994 | * e_reusable handling. | |
82939d79 | 1995 | */ |
6048c64b AG |
1996 | if (hlist_bl_unhashed(&ce->e_hash_list) || |
1997 | !ce->e_reusable) { | |
82939d79 JK |
1998 | /* |
1999 | * Undo everything and check mbcache | |
2000 | * again. | |
2001 | */ | |
2002 | unlock_buffer(new_bh); | |
2003 | dquot_free_block(inode, | |
2004 | EXT4_C2B(EXT4_SB(sb), | |
2005 | 1)); | |
2006 | brelse(new_bh); | |
47387409 | 2007 | mb_cache_entry_put(ea_block_cache, ce); |
82939d79 JK |
2008 | ce = NULL; |
2009 | new_bh = NULL; | |
2010 | goto inserted; | |
2011 | } | |
6048c64b AG |
2012 | ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
2013 | BHDR(new_bh)->h_refcount = cpu_to_le32(ref); | |
2014 | if (ref >= EXT4_XATTR_REFCOUNT_MAX) | |
2015 | ce->e_reusable = 0; | |
ac27a0ec | 2016 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
6048c64b | 2017 | ref); |
dac7a4b4 | 2018 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec | 2019 | unlock_buffer(new_bh); |
dac7a4b4 TT |
2020 | error = ext4_handle_dirty_metadata(handle, |
2021 | inode, | |
2022 | new_bh); | |
ac27a0ec DK |
2023 | if (error) |
2024 | goto cleanup_dquot; | |
2025 | } | |
47387409 TE |
2026 | mb_cache_entry_touch(ea_block_cache, ce); |
2027 | mb_cache_entry_put(ea_block_cache, ce); | |
ac27a0ec DK |
2028 | ce = NULL; |
2029 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
2030 | /* We were modifying this block in-place. */ | |
2031 | ea_bdebug(bs->bh, "keeping this block"); | |
ec000220 | 2032 | ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); |
ac27a0ec DK |
2033 | new_bh = bs->bh; |
2034 | get_bh(new_bh); | |
2035 | } else { | |
2036 | /* We need to allocate a new block */ | |
fb0a387d ES |
2037 | ext4_fsblk_t goal, block; |
2038 | ||
b8cb5a54 TE |
2039 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
2040 | ||
fb0a387d | 2041 | goal = ext4_group_first_block_no(sb, |
d00a6d7b | 2042 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
2043 | |
2044 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 2045 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2046 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
2047 | ||
55f020db AH |
2048 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
2049 | NULL, &error); | |
ac27a0ec DK |
2050 | if (error) |
2051 | goto cleanup; | |
fb0a387d | 2052 | |
12e9b892 | 2053 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2054 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
2055 | ||
ace36ad4 JP |
2056 | ea_idebug(inode, "creating block %llu", |
2057 | (unsigned long long)block); | |
ac27a0ec DK |
2058 | |
2059 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 2060 | if (unlikely(!new_bh)) { |
860d21e2 | 2061 | error = -ENOMEM; |
ac27a0ec | 2062 | getblk_failed: |
7dc57615 | 2063 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 2064 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
2065 | goto cleanup; |
2066 | } | |
dec214d0 TE |
2067 | error = ext4_xattr_inode_inc_ref_all(handle, inode, |
2068 | ENTRY(header(s->base)+1)); | |
2069 | if (error) | |
2070 | goto getblk_failed; | |
2071 | if (ea_inode) { | |
2072 | /* Drop the extra ref on ea_inode. */ | |
2073 | error = ext4_xattr_inode_dec_ref(handle, | |
2074 | ea_inode); | |
2075 | if (error) | |
2076 | ext4_warning_inode(ea_inode, | |
2077 | "dec ref error=%d", | |
2078 | error); | |
2079 | iput(ea_inode); | |
2080 | ea_inode = NULL; | |
2081 | } | |
2082 | ||
ac27a0ec | 2083 | lock_buffer(new_bh); |
617ba13b | 2084 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
2085 | if (error) { |
2086 | unlock_buffer(new_bh); | |
860d21e2 | 2087 | error = -EIO; |
ac27a0ec DK |
2088 | goto getblk_failed; |
2089 | } | |
2090 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
dac7a4b4 | 2091 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec DK |
2092 | set_buffer_uptodate(new_bh); |
2093 | unlock_buffer(new_bh); | |
47387409 | 2094 | ext4_xattr_block_cache_insert(ea_block_cache, new_bh); |
dac7a4b4 TT |
2095 | error = ext4_handle_dirty_metadata(handle, inode, |
2096 | new_bh); | |
ac27a0ec DK |
2097 | if (error) |
2098 | goto cleanup; | |
2099 | } | |
2100 | } | |
2101 | ||
a6d05676 TE |
2102 | if (old_ea_inode_quota) |
2103 | ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); | |
dec214d0 | 2104 | |
ac27a0ec | 2105 | /* Update the inode. */ |
617ba13b | 2106 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
2107 | |
2108 | /* Drop the previous xattr block. */ | |
dec214d0 TE |
2109 | if (bs->bh && bs->bh != new_bh) { |
2110 | struct ext4_xattr_inode_array *ea_inode_array = NULL; | |
2111 | ||
2112 | ext4_xattr_release_block(handle, inode, bs->bh, | |
2113 | &ea_inode_array, | |
2114 | 0 /* extra_credits */); | |
2115 | ext4_xattr_inode_array_free(ea_inode_array); | |
2116 | } | |
ac27a0ec DK |
2117 | error = 0; |
2118 | ||
2119 | cleanup: | |
dec214d0 TE |
2120 | if (ea_inode) { |
2121 | int error2; | |
2122 | ||
2123 | error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
2124 | if (error2) | |
2125 | ext4_warning_inode(ea_inode, "dec ref error=%d", | |
2126 | error2); | |
2127 | ||
2128 | /* If there was an error, revert the quota charge. */ | |
2129 | if (error) | |
a6d05676 | 2130 | ext4_xattr_inode_free_quota(inode, ea_inode, |
dec214d0 TE |
2131 | i_size_read(ea_inode)); |
2132 | iput(ea_inode); | |
2133 | } | |
ac27a0ec | 2134 | if (ce) |
47387409 | 2135 | mb_cache_entry_put(ea_block_cache, ce); |
ac27a0ec DK |
2136 | brelse(new_bh); |
2137 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
2138 | kfree(s->base); | |
2139 | ||
2140 | return error; | |
2141 | ||
2142 | cleanup_dquot: | |
1231b3a1 | 2143 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
2144 | goto cleanup; |
2145 | ||
2146 | bad_block: | |
24676da4 TT |
2147 | EXT4_ERROR_INODE(inode, "bad block %llu", |
2148 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
2149 | goto cleanup; |
2150 | ||
2151 | #undef header | |
2152 | } | |
2153 | ||
879b3825 TM |
2154 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
2155 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2156 | { |
617ba13b MC |
2157 | struct ext4_xattr_ibody_header *header; |
2158 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
2159 | int error; |
2160 | ||
617ba13b | 2161 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 2162 | return 0; |
617ba13b | 2163 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
2164 | header = IHDR(inode, raw_inode); |
2165 | is->s.base = is->s.first = IFIRST(header); | |
2166 | is->s.here = is->s.first; | |
617ba13b | 2167 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 2168 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
9e92f48c | 2169 | error = xattr_check_inode(inode, header, is->s.end); |
ac27a0ec DK |
2170 | if (error) |
2171 | return error; | |
2172 | /* Find the named attribute. */ | |
9496005d TT |
2173 | error = xattr_find_entry(inode, &is->s.here, is->s.end, |
2174 | i->name_index, i->name, 0); | |
ac27a0ec DK |
2175 | if (error && error != -ENODATA) |
2176 | return error; | |
2177 | is->s.not_found = error; | |
2178 | } | |
2179 | return 0; | |
2180 | } | |
2181 | ||
0d812f77 TM |
2182 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
2183 | struct ext4_xattr_info *i, | |
2184 | struct ext4_xattr_ibody_find *is) | |
2185 | { | |
2186 | struct ext4_xattr_ibody_header *header; | |
2187 | struct ext4_xattr_search *s = &is->s; | |
2188 | int error; | |
2189 | ||
2190 | if (EXT4_I(inode)->i_extra_isize == 0) | |
2191 | return -ENOSPC; | |
daf83281 | 2192 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
8bc1379b TT |
2193 | if (error) |
2194 | return error; | |
0d812f77 TM |
2195 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
2196 | if (!IS_LAST_ENTRY(s->first)) { | |
2197 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
2198 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
2199 | } else { | |
2200 | header->h_magic = cpu_to_le32(0); | |
2201 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
2202 | } | |
2203 | return 0; | |
2204 | } | |
2205 | ||
e50e5129 | 2206 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, |
0d812f77 TM |
2207 | struct ext4_xattr_info *i, |
2208 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2209 | { |
617ba13b MC |
2210 | struct ext4_xattr_ibody_header *header; |
2211 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
2212 | int error; |
2213 | ||
617ba13b | 2214 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 2215 | return -ENOSPC; |
daf83281 | 2216 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
ac27a0ec DK |
2217 | if (error) |
2218 | return error; | |
617ba13b | 2219 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 2220 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 2221 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 2222 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2223 | } else { |
2224 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 2225 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2226 | } |
2227 | return 0; | |
2228 | } | |
2229 | ||
3fd16462 JK |
2230 | static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
2231 | struct ext4_xattr_info *i) | |
2232 | { | |
2233 | void *value; | |
2234 | ||
0bd454c0 TE |
2235 | /* When e_value_inum is set the value is stored externally. */ |
2236 | if (s->here->e_value_inum) | |
2237 | return 0; | |
3fd16462 JK |
2238 | if (le32_to_cpu(s->here->e_value_size) != i->value_len) |
2239 | return 0; | |
2240 | value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); | |
2241 | return !memcmp(value, i->value, i->value_len); | |
2242 | } | |
2243 | ||
dec214d0 TE |
2244 | static struct buffer_head *ext4_xattr_get_block(struct inode *inode) |
2245 | { | |
2246 | struct buffer_head *bh; | |
2247 | int error; | |
2248 | ||
2249 | if (!EXT4_I(inode)->i_file_acl) | |
2250 | return NULL; | |
fb265c9c TT |
2251 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2252 | if (IS_ERR(bh)) | |
2253 | return bh; | |
dec214d0 | 2254 | error = ext4_xattr_check_block(inode, bh); |
ecaaf408 VA |
2255 | if (error) { |
2256 | brelse(bh); | |
dec214d0 | 2257 | return ERR_PTR(error); |
ecaaf408 | 2258 | } |
dec214d0 TE |
2259 | return bh; |
2260 | } | |
2261 | ||
ac27a0ec | 2262 | /* |
617ba13b | 2263 | * ext4_xattr_set_handle() |
ac27a0ec | 2264 | * |
6e9510b0 | 2265 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
2266 | * is NULL to remove an existing extended attribute, and non-NULL to |
2267 | * either replace an existing extended attribute, or create a new extended | |
2268 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
2269 | * specify that an extended attribute must exist and must not exist | |
2270 | * previous to the call, respectively. | |
2271 | * | |
2272 | * Returns 0, or a negative error number on failure. | |
2273 | */ | |
2274 | int | |
617ba13b | 2275 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
2276 | const char *name, const void *value, size_t value_len, |
2277 | int flags) | |
2278 | { | |
617ba13b | 2279 | struct ext4_xattr_info i = { |
ac27a0ec DK |
2280 | .name_index = name_index, |
2281 | .name = name, | |
2282 | .value = value, | |
2283 | .value_len = value_len, | |
e50e5129 | 2284 | .in_inode = 0, |
ac27a0ec | 2285 | }; |
617ba13b | 2286 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
2287 | .s = { .not_found = -ENODATA, }, |
2288 | }; | |
617ba13b | 2289 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
2290 | .s = { .not_found = -ENODATA, }, |
2291 | }; | |
c755e251 | 2292 | int no_expand; |
ac27a0ec DK |
2293 | int error; |
2294 | ||
2295 | if (!name) | |
2296 | return -EINVAL; | |
2297 | if (strlen(name) > 255) | |
2298 | return -ERANGE; | |
b8cb5a54 | 2299 | |
c755e251 | 2300 | ext4_write_lock_xattr(inode, &no_expand); |
4d20c685 | 2301 | |
c1a5d5f6 TE |
2302 | /* Check journal credits under write lock. */ |
2303 | if (ext4_handle_valid(handle)) { | |
dec214d0 | 2304 | struct buffer_head *bh; |
c1a5d5f6 TE |
2305 | int credits; |
2306 | ||
dec214d0 TE |
2307 | bh = ext4_xattr_get_block(inode); |
2308 | if (IS_ERR(bh)) { | |
2309 | error = PTR_ERR(bh); | |
2310 | goto cleanup; | |
2311 | } | |
2312 | ||
af65207c TE |
2313 | credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2314 | value_len, | |
2315 | flags & XATTR_CREATE); | |
dec214d0 TE |
2316 | brelse(bh); |
2317 | ||
a9a8344e | 2318 | if (jbd2_handle_buffer_credits(handle) < credits) { |
c1a5d5f6 TE |
2319 | error = -ENOSPC; |
2320 | goto cleanup; | |
2321 | } | |
2322 | } | |
2323 | ||
66543617 | 2324 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
2325 | if (error) |
2326 | goto cleanup; | |
2327 | ||
19f5fb7a | 2328 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
2329 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
2330 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 2331 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
2332 | } |
2333 | ||
617ba13b | 2334 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
2335 | if (error) |
2336 | goto cleanup; | |
2337 | if (is.s.not_found) | |
617ba13b | 2338 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
2339 | if (error) |
2340 | goto cleanup; | |
2341 | if (is.s.not_found && bs.s.not_found) { | |
2342 | error = -ENODATA; | |
2343 | if (flags & XATTR_REPLACE) | |
2344 | goto cleanup; | |
2345 | error = 0; | |
2346 | if (!value) | |
2347 | goto cleanup; | |
2348 | } else { | |
2349 | error = -EEXIST; | |
2350 | if (flags & XATTR_CREATE) | |
2351 | goto cleanup; | |
2352 | } | |
dec214d0 | 2353 | |
ac27a0ec DK |
2354 | if (!value) { |
2355 | if (!is.s.not_found) | |
e50e5129 | 2356 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 2357 | else if (!bs.s.not_found) |
617ba13b | 2358 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2359 | } else { |
3fd16462 JK |
2360 | error = 0; |
2361 | /* Xattr value did not change? Save us some work and bail out */ | |
2362 | if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) | |
2363 | goto cleanup; | |
2364 | if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) | |
2365 | goto cleanup; | |
2366 | ||
b347e2bc TE |
2367 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2368 | (EXT4_XATTR_SIZE(i.value_len) > | |
2369 | EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) | |
2370 | i.in_inode = 1; | |
2371 | retry_inode: | |
e50e5129 | 2372 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
2373 | if (!error && !bs.s.not_found) { |
2374 | i.value = NULL; | |
617ba13b | 2375 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2376 | } else if (error == -ENOSPC) { |
7e01c8e5 | 2377 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
45ae932d VA |
2378 | brelse(bs.bh); |
2379 | bs.bh = NULL; | |
7e01c8e5 TY |
2380 | error = ext4_xattr_block_find(inode, &i, &bs); |
2381 | if (error) | |
2382 | goto cleanup; | |
2383 | } | |
617ba13b | 2384 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
b347e2bc | 2385 | if (!error && !is.s.not_found) { |
ac27a0ec | 2386 | i.value = NULL; |
e50e5129 AD |
2387 | error = ext4_xattr_ibody_set(handle, inode, &i, |
2388 | &is); | |
b347e2bc TE |
2389 | } else if (error == -ENOSPC) { |
2390 | /* | |
2391 | * Xattr does not fit in the block, store at | |
2392 | * external inode if possible. | |
2393 | */ | |
2394 | if (ext4_has_feature_ea_inode(inode->i_sb) && | |
2395 | !i.in_inode) { | |
2396 | i.in_inode = 1; | |
2397 | goto retry_inode; | |
2398 | } | |
ac27a0ec DK |
2399 | } |
2400 | } | |
2401 | } | |
2402 | if (!error) { | |
617ba13b | 2403 | ext4_xattr_update_super_block(handle, inode->i_sb); |
eeca7ea1 | 2404 | inode->i_ctime = current_time(inode); |
6dd4ee7c | 2405 | if (!value) |
c755e251 | 2406 | no_expand = 0; |
617ba13b | 2407 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 2408 | /* |
617ba13b | 2409 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
2410 | * error != 0. |
2411 | */ | |
2412 | is.iloc.bh = NULL; | |
2413 | if (IS_SYNC(inode)) | |
0390131b | 2414 | ext4_handle_sync(handle); |
ac27a0ec DK |
2415 | } |
2416 | ||
2417 | cleanup: | |
2418 | brelse(is.iloc.bh); | |
2419 | brelse(bs.bh); | |
c755e251 | 2420 | ext4_write_unlock_xattr(inode, &no_expand); |
ac27a0ec DK |
2421 | return error; |
2422 | } | |
2423 | ||
af65207c TE |
2424 | int ext4_xattr_set_credits(struct inode *inode, size_t value_len, |
2425 | bool is_create, int *credits) | |
c1a5d5f6 | 2426 | { |
dec214d0 TE |
2427 | struct buffer_head *bh; |
2428 | int err; | |
c1a5d5f6 | 2429 | |
dec214d0 | 2430 | *credits = 0; |
c1a5d5f6 | 2431 | |
dec214d0 TE |
2432 | if (!EXT4_SB(inode->i_sb)->s_journal) |
2433 | return 0; | |
c1a5d5f6 | 2434 | |
dec214d0 | 2435 | down_read(&EXT4_I(inode)->xattr_sem); |
c1a5d5f6 | 2436 | |
dec214d0 TE |
2437 | bh = ext4_xattr_get_block(inode); |
2438 | if (IS_ERR(bh)) { | |
2439 | err = PTR_ERR(bh); | |
2440 | } else { | |
af65207c TE |
2441 | *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2442 | value_len, is_create); | |
dec214d0 TE |
2443 | brelse(bh); |
2444 | err = 0; | |
c1a5d5f6 | 2445 | } |
dec214d0 TE |
2446 | |
2447 | up_read(&EXT4_I(inode)->xattr_sem); | |
2448 | return err; | |
c1a5d5f6 TE |
2449 | } |
2450 | ||
ac27a0ec | 2451 | /* |
617ba13b | 2452 | * ext4_xattr_set() |
ac27a0ec | 2453 | * |
617ba13b | 2454 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
2455 | * attribute modification is a filesystem transaction by itself. |
2456 | * | |
2457 | * Returns 0, or a negative error number on failure. | |
2458 | */ | |
2459 | int | |
617ba13b | 2460 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
2461 | const void *value, size_t value_len, int flags) |
2462 | { | |
2463 | handle_t *handle; | |
e50e5129 | 2464 | struct super_block *sb = inode->i_sb; |
ac27a0ec | 2465 | int error, retries = 0; |
c1a5d5f6 | 2466 | int credits; |
ac27a0ec | 2467 | |
b8cb5a54 TE |
2468 | error = dquot_initialize(inode); |
2469 | if (error) | |
2470 | return error; | |
e50e5129 | 2471 | |
ac27a0ec | 2472 | retry: |
af65207c TE |
2473 | error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, |
2474 | &credits); | |
dec214d0 TE |
2475 | if (error) |
2476 | return error; | |
2477 | ||
9924a92a | 2478 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
2479 | if (IS_ERR(handle)) { |
2480 | error = PTR_ERR(handle); | |
2481 | } else { | |
2482 | int error2; | |
2483 | ||
617ba13b | 2484 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 2485 | value, value_len, flags); |
617ba13b | 2486 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 2487 | if (error == -ENOSPC && |
e50e5129 | 2488 | ext4_should_retry_alloc(sb, &retries)) |
ac27a0ec DK |
2489 | goto retry; |
2490 | if (error == 0) | |
2491 | error = error2; | |
2492 | } | |
2493 | ||
2494 | return error; | |
2495 | } | |
2496 | ||
6dd4ee7c KS |
2497 | /* |
2498 | * Shift the EA entries in the inode to create space for the increased | |
2499 | * i_extra_isize. | |
2500 | */ | |
2501 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
2502 | int value_offs_shift, void *to, | |
94405713 | 2503 | void *from, size_t n) |
6dd4ee7c KS |
2504 | { |
2505 | struct ext4_xattr_entry *last = entry; | |
2506 | int new_offs; | |
2507 | ||
94405713 JK |
2508 | /* We always shift xattr headers further thus offsets get lower */ |
2509 | BUG_ON(value_offs_shift > 0); | |
2510 | ||
6dd4ee7c KS |
2511 | /* Adjust the value offsets of the entries */ |
2512 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 2513 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
2514 | new_offs = le16_to_cpu(last->e_value_offs) + |
2515 | value_offs_shift; | |
6dd4ee7c KS |
2516 | last->e_value_offs = cpu_to_le16(new_offs); |
2517 | } | |
2518 | } | |
2519 | /* Shift the entries by n bytes */ | |
2520 | memmove(to, from, n); | |
2521 | } | |
2522 | ||
3f2571c1 JK |
2523 | /* |
2524 | * Move xattr pointed to by 'entry' from inode into external xattr block | |
2525 | */ | |
2526 | static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, | |
2527 | struct ext4_inode *raw_inode, | |
2528 | struct ext4_xattr_entry *entry) | |
2529 | { | |
2530 | struct ext4_xattr_ibody_find *is = NULL; | |
2531 | struct ext4_xattr_block_find *bs = NULL; | |
2532 | char *buffer = NULL, *b_entry_name = NULL; | |
f6109100 | 2533 | size_t value_size = le32_to_cpu(entry->e_value_size); |
3f2571c1 JK |
2534 | struct ext4_xattr_info i = { |
2535 | .value = NULL, | |
2536 | .value_len = 0, | |
2537 | .name_index = entry->e_name_index, | |
f6109100 | 2538 | .in_inode = !!entry->e_value_inum, |
3f2571c1 JK |
2539 | }; |
2540 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2541 | int error; | |
2542 | ||
3f2571c1 JK |
2543 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); |
2544 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
2545 | buffer = kmalloc(value_size, GFP_NOFS); | |
2546 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
2547 | if (!is || !bs || !buffer || !b_entry_name) { | |
2548 | error = -ENOMEM; | |
2549 | goto out; | |
2550 | } | |
2551 | ||
2552 | is->s.not_found = -ENODATA; | |
2553 | bs->s.not_found = -ENODATA; | |
2554 | is->iloc.bh = NULL; | |
2555 | bs->bh = NULL; | |
2556 | ||
2557 | /* Save the entry name and the entry value */ | |
f6109100 | 2558 | if (entry->e_value_inum) { |
b9fc761e | 2559 | error = ext4_xattr_inode_get(inode, entry, buffer, value_size); |
f6109100 TE |
2560 | if (error) |
2561 | goto out; | |
2562 | } else { | |
2563 | size_t value_offs = le16_to_cpu(entry->e_value_offs); | |
2564 | memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); | |
2565 | } | |
2566 | ||
3f2571c1 JK |
2567 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); |
2568 | b_entry_name[entry->e_name_len] = '\0'; | |
2569 | i.name = b_entry_name; | |
2570 | ||
2571 | error = ext4_get_inode_loc(inode, &is->iloc); | |
2572 | if (error) | |
2573 | goto out; | |
2574 | ||
2575 | error = ext4_xattr_ibody_find(inode, &i, is); | |
2576 | if (error) | |
2577 | goto out; | |
2578 | ||
2579 | /* Remove the chosen entry from the inode */ | |
e50e5129 | 2580 | error = ext4_xattr_ibody_set(handle, inode, &i, is); |
3f2571c1 JK |
2581 | if (error) |
2582 | goto out; | |
2583 | ||
3f2571c1 JK |
2584 | i.value = buffer; |
2585 | i.value_len = value_size; | |
2586 | error = ext4_xattr_block_find(inode, &i, bs); | |
2587 | if (error) | |
2588 | goto out; | |
2589 | ||
2590 | /* Add entry which was removed from the inode into the block */ | |
2591 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
2592 | if (error) | |
2593 | goto out; | |
2594 | error = 0; | |
2595 | out: | |
2596 | kfree(b_entry_name); | |
2597 | kfree(buffer); | |
2598 | if (is) | |
2599 | brelse(is->iloc.bh); | |
6bdc9977 VA |
2600 | if (bs) |
2601 | brelse(bs->bh); | |
3f2571c1 JK |
2602 | kfree(is); |
2603 | kfree(bs); | |
2604 | ||
2605 | return error; | |
2606 | } | |
2607 | ||
dfa2064b JK |
2608 | static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, |
2609 | struct ext4_inode *raw_inode, | |
2610 | int isize_diff, size_t ifree, | |
2611 | size_t bfree, int *total_ino) | |
2612 | { | |
2613 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2614 | struct ext4_xattr_entry *small_entry; | |
2615 | struct ext4_xattr_entry *entry; | |
2616 | struct ext4_xattr_entry *last; | |
2617 | unsigned int entry_size; /* EA entry size */ | |
2618 | unsigned int total_size; /* EA entry size + value size */ | |
2619 | unsigned int min_total_size; | |
2620 | int error; | |
2621 | ||
2622 | while (isize_diff > ifree) { | |
2623 | entry = NULL; | |
2624 | small_entry = NULL; | |
2625 | min_total_size = ~0U; | |
2626 | last = IFIRST(header); | |
2627 | /* Find the entry best suited to be pushed into EA block */ | |
2628 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
8cdb5240 TT |
2629 | /* never move system.data out of the inode */ |
2630 | if ((last->e_name_len == 4) && | |
2631 | (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) && | |
2632 | !memcmp(last->e_name, "data", 4)) | |
2633 | continue; | |
9bb21ced TE |
2634 | total_size = EXT4_XATTR_LEN(last->e_name_len); |
2635 | if (!last->e_value_inum) | |
2636 | total_size += EXT4_XATTR_SIZE( | |
2637 | le32_to_cpu(last->e_value_size)); | |
dfa2064b JK |
2638 | if (total_size <= bfree && |
2639 | total_size < min_total_size) { | |
2640 | if (total_size + ifree < isize_diff) { | |
2641 | small_entry = last; | |
2642 | } else { | |
2643 | entry = last; | |
2644 | min_total_size = total_size; | |
2645 | } | |
2646 | } | |
2647 | } | |
2648 | ||
2649 | if (entry == NULL) { | |
2650 | if (small_entry == NULL) | |
2651 | return -ENOSPC; | |
2652 | entry = small_entry; | |
2653 | } | |
2654 | ||
2655 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
9bb21ced TE |
2656 | total_size = entry_size; |
2657 | if (!entry->e_value_inum) | |
2658 | total_size += EXT4_XATTR_SIZE( | |
2659 | le32_to_cpu(entry->e_value_size)); | |
dfa2064b JK |
2660 | error = ext4_xattr_move_to_block(handle, inode, raw_inode, |
2661 | entry); | |
2662 | if (error) | |
2663 | return error; | |
2664 | ||
2665 | *total_ino -= entry_size; | |
2666 | ifree += total_size; | |
2667 | bfree -= total_size; | |
2668 | } | |
2669 | ||
2670 | return 0; | |
2671 | } | |
2672 | ||
6dd4ee7c KS |
2673 | /* |
2674 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
2675 | * Returns 0 on success or negative error number on failure. | |
2676 | */ | |
2677 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
2678 | struct ext4_inode *raw_inode, handle_t *handle) | |
2679 | { | |
2680 | struct ext4_xattr_ibody_header *header; | |
cf0a5e81 MX |
2681 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
2682 | static unsigned int mnt_count; | |
e3014d14 JK |
2683 | size_t min_offs; |
2684 | size_t ifree, bfree; | |
7b1b2c1b | 2685 | int total_ino; |
6e0cd088 | 2686 | void *base, *end; |
d0141191 | 2687 | int error = 0, tried_min_extra_isize = 0; |
cf0a5e81 | 2688 | int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); |
d0141191 | 2689 | int isize_diff; /* How much do we need to grow i_extra_isize */ |
6dd4ee7c | 2690 | |
6dd4ee7c | 2691 | retry: |
d0141191 | 2692 | isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; |
2e81a4ee | 2693 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) |
b640b2c5 | 2694 | return 0; |
6dd4ee7c KS |
2695 | |
2696 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
2697 | |
2698 | /* | |
2699 | * Check if enough free space is available in the inode to shift the | |
2700 | * entries ahead by new_extra_isize. | |
2701 | */ | |
2702 | ||
6e0cd088 | 2703 | base = IFIRST(header); |
6dd4ee7c KS |
2704 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
2705 | min_offs = end - base; | |
a805622a | 2706 | total_ino = sizeof(struct ext4_xattr_ibody_header) + sizeof(u32); |
6dd4ee7c | 2707 | |
9e92f48c TT |
2708 | error = xattr_check_inode(inode, header, end); |
2709 | if (error) | |
2710 | goto cleanup; | |
2711 | ||
6e0cd088 | 2712 | ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); |
e3014d14 JK |
2713 | if (ifree >= isize_diff) |
2714 | goto shift; | |
6dd4ee7c KS |
2715 | |
2716 | /* | |
2717 | * Enough free space isn't available in the inode, check if | |
2718 | * EA block can hold new_extra_isize bytes. | |
2719 | */ | |
2720 | if (EXT4_I(inode)->i_file_acl) { | |
53692ec0 VA |
2721 | struct buffer_head *bh; |
2722 | ||
fb265c9c TT |
2723 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2724 | if (IS_ERR(bh)) { | |
2725 | error = PTR_ERR(bh); | |
6dd4ee7c | 2726 | goto cleanup; |
fb265c9c | 2727 | } |
de05ca85 | 2728 | error = ext4_xattr_check_block(inode, bh); |
53692ec0 VA |
2729 | if (error) { |
2730 | brelse(bh); | |
6dd4ee7c | 2731 | goto cleanup; |
53692ec0 | 2732 | } |
6dd4ee7c | 2733 | base = BHDR(bh); |
6dd4ee7c KS |
2734 | end = bh->b_data + bh->b_size; |
2735 | min_offs = end - base; | |
6e0cd088 JK |
2736 | bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, |
2737 | NULL); | |
b640b2c5 | 2738 | brelse(bh); |
e3014d14 | 2739 | if (bfree + ifree < isize_diff) { |
6dd4ee7c KS |
2740 | if (!tried_min_extra_isize && s_min_extra_isize) { |
2741 | tried_min_extra_isize++; | |
2742 | new_extra_isize = s_min_extra_isize; | |
6dd4ee7c KS |
2743 | goto retry; |
2744 | } | |
dfa2064b | 2745 | error = -ENOSPC; |
6dd4ee7c KS |
2746 | goto cleanup; |
2747 | } | |
2748 | } else { | |
e3014d14 | 2749 | bfree = inode->i_sb->s_blocksize; |
6dd4ee7c KS |
2750 | } |
2751 | ||
dfa2064b JK |
2752 | error = ext4_xattr_make_inode_space(handle, inode, raw_inode, |
2753 | isize_diff, ifree, bfree, | |
2754 | &total_ino); | |
2755 | if (error) { | |
2756 | if (error == -ENOSPC && !tried_min_extra_isize && | |
2757 | s_min_extra_isize) { | |
2758 | tried_min_extra_isize++; | |
2759 | new_extra_isize = s_min_extra_isize; | |
dfa2064b | 2760 | goto retry; |
6dd4ee7c | 2761 | } |
dfa2064b | 2762 | goto cleanup; |
6dd4ee7c | 2763 | } |
e3014d14 JK |
2764 | shift: |
2765 | /* Adjust the offsets and shift the remaining entries ahead */ | |
6e0cd088 | 2766 | ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize |
e3014d14 JK |
2767 | - new_extra_isize, (void *)raw_inode + |
2768 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
94405713 | 2769 | (void *)header, total_ino); |
e3014d14 | 2770 | EXT4_I(inode)->i_extra_isize = new_extra_isize; |
6dd4ee7c KS |
2771 | |
2772 | cleanup: | |
b640b2c5 | 2773 | if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { |
cf0a5e81 MX |
2774 | ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", |
2775 | inode->i_ino); | |
2776 | mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); | |
2777 | } | |
6dd4ee7c KS |
2778 | return error; |
2779 | } | |
2780 | ||
e50e5129 AD |
2781 | #define EIA_INCR 16 /* must be 2^n */ |
2782 | #define EIA_MASK (EIA_INCR - 1) | |
dec214d0 TE |
2783 | |
2784 | /* Add the large xattr @inode into @ea_inode_array for deferred iput(). | |
0421a189 | 2785 | * If @ea_inode_array is new or full it will be grown and the old |
e50e5129 AD |
2786 | * contents copied over. |
2787 | */ | |
2788 | static int | |
0421a189 TE |
2789 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, |
2790 | struct inode *inode) | |
e50e5129 | 2791 | { |
0421a189 | 2792 | if (*ea_inode_array == NULL) { |
e50e5129 AD |
2793 | /* |
2794 | * Start with 15 inodes, so it fits into a power-of-two size. | |
0421a189 | 2795 | * If *ea_inode_array is NULL, this is essentially offsetof() |
e50e5129 | 2796 | */ |
0421a189 TE |
2797 | (*ea_inode_array) = |
2798 | kmalloc(offsetof(struct ext4_xattr_inode_array, | |
2799 | inodes[EIA_MASK]), | |
e50e5129 | 2800 | GFP_NOFS); |
0421a189 | 2801 | if (*ea_inode_array == NULL) |
e50e5129 | 2802 | return -ENOMEM; |
0421a189 TE |
2803 | (*ea_inode_array)->count = 0; |
2804 | } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { | |
e50e5129 | 2805 | /* expand the array once all 15 + n * 16 slots are full */ |
0421a189 TE |
2806 | struct ext4_xattr_inode_array *new_array = NULL; |
2807 | int count = (*ea_inode_array)->count; | |
e50e5129 AD |
2808 | |
2809 | /* if new_array is NULL, this is essentially offsetof() */ | |
2810 | new_array = kmalloc( | |
0421a189 TE |
2811 | offsetof(struct ext4_xattr_inode_array, |
2812 | inodes[count + EIA_INCR]), | |
e50e5129 AD |
2813 | GFP_NOFS); |
2814 | if (new_array == NULL) | |
2815 | return -ENOMEM; | |
0421a189 TE |
2816 | memcpy(new_array, *ea_inode_array, |
2817 | offsetof(struct ext4_xattr_inode_array, inodes[count])); | |
2818 | kfree(*ea_inode_array); | |
2819 | *ea_inode_array = new_array; | |
e50e5129 | 2820 | } |
0421a189 | 2821 | (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; |
e50e5129 AD |
2822 | return 0; |
2823 | } | |
2824 | ||
ac27a0ec | 2825 | /* |
617ba13b | 2826 | * ext4_xattr_delete_inode() |
ac27a0ec | 2827 | * |
e50e5129 | 2828 | * Free extended attribute resources associated with this inode. Traverse |
dec214d0 TE |
2829 | * all entries and decrement reference on any xattr inodes associated with this |
2830 | * inode. This is called immediately before an inode is freed. We have exclusive | |
2831 | * access to the inode. If an orphan inode is deleted it will also release its | |
2832 | * references on xattr block and xattr inodes. | |
ac27a0ec | 2833 | */ |
dec214d0 TE |
2834 | int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, |
2835 | struct ext4_xattr_inode_array **ea_inode_array, | |
2836 | int extra_credits) | |
ac27a0ec DK |
2837 | { |
2838 | struct buffer_head *bh = NULL; | |
e50e5129 | 2839 | struct ext4_xattr_ibody_header *header; |
30a7eb97 | 2840 | struct ext4_iloc iloc = { .bh = NULL }; |
dec214d0 | 2841 | struct ext4_xattr_entry *entry; |
a6d05676 | 2842 | struct inode *ea_inode; |
30a7eb97 TE |
2843 | int error; |
2844 | ||
83448bdf JK |
2845 | error = ext4_journal_ensure_credits(handle, extra_credits, |
2846 | ext4_free_metadata_revoke_credits(inode->i_sb, 1)); | |
a4130367 | 2847 | if (error < 0) { |
30a7eb97 TE |
2848 | EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); |
2849 | goto cleanup; | |
2850 | } | |
ac27a0ec | 2851 | |
dec214d0 TE |
2852 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2853 | ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
e50e5129 | 2854 | |
dec214d0 TE |
2855 | error = ext4_get_inode_loc(inode, &iloc); |
2856 | if (error) { | |
2857 | EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); | |
2858 | goto cleanup; | |
2859 | } | |
30a7eb97 | 2860 | |
dec214d0 TE |
2861 | error = ext4_journal_get_write_access(handle, iloc.bh); |
2862 | if (error) { | |
2863 | EXT4_ERROR_INODE(inode, "write access (error %d)", | |
2864 | error); | |
2865 | goto cleanup; | |
2866 | } | |
e50e5129 | 2867 | |
dec214d0 TE |
2868 | header = IHDR(inode, ext4_raw_inode(&iloc)); |
2869 | if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) | |
2870 | ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, | |
2871 | IFIRST(header), | |
2872 | false /* block_csum */, | |
2873 | ea_inode_array, | |
2874 | extra_credits, | |
2875 | false /* skip_quota */); | |
ac27a0ec | 2876 | } |
e50e5129 | 2877 | |
dec214d0 | 2878 | if (EXT4_I(inode)->i_file_acl) { |
fb265c9c TT |
2879 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2880 | if (IS_ERR(bh)) { | |
2881 | error = PTR_ERR(bh); | |
878520ac TT |
2882 | if (error == -EIO) { |
2883 | ext4_set_errno(inode->i_sb, EIO); | |
fb265c9c TT |
2884 | EXT4_ERROR_INODE(inode, "block %llu read error", |
2885 | EXT4_I(inode)->i_file_acl); | |
878520ac | 2886 | } |
7159a986 | 2887 | bh = NULL; |
dec214d0 TE |
2888 | goto cleanup; |
2889 | } | |
2890 | error = ext4_xattr_check_block(inode, bh); | |
de05ca85 | 2891 | if (error) |
e50e5129 | 2892 | goto cleanup; |
e50e5129 | 2893 | |
dec214d0 TE |
2894 | if (ext4_has_feature_ea_inode(inode->i_sb)) { |
2895 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
a6d05676 TE |
2896 | entry = EXT4_XATTR_NEXT(entry)) { |
2897 | if (!entry->e_value_inum) | |
2898 | continue; | |
2899 | error = ext4_xattr_inode_iget(inode, | |
2900 | le32_to_cpu(entry->e_value_inum), | |
2901 | le32_to_cpu(entry->e_hash), | |
2902 | &ea_inode); | |
2903 | if (error) | |
2904 | continue; | |
2905 | ext4_xattr_inode_free_quota(inode, ea_inode, | |
dec214d0 | 2906 | le32_to_cpu(entry->e_value_size)); |
a6d05676 TE |
2907 | iput(ea_inode); |
2908 | } | |
dec214d0 TE |
2909 | |
2910 | } | |
2911 | ||
2912 | ext4_xattr_release_block(handle, inode, bh, ea_inode_array, | |
2913 | extra_credits); | |
2914 | /* | |
2915 | * Update i_file_acl value in the same transaction that releases | |
2916 | * block. | |
2917 | */ | |
2918 | EXT4_I(inode)->i_file_acl = 0; | |
2919 | error = ext4_mark_inode_dirty(handle, inode); | |
2920 | if (error) { | |
2921 | EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", | |
2922 | error); | |
2923 | goto cleanup; | |
2924 | } | |
30a7eb97 | 2925 | } |
dec214d0 | 2926 | error = 0; |
ac27a0ec | 2927 | cleanup: |
30a7eb97 | 2928 | brelse(iloc.bh); |
ac27a0ec | 2929 | brelse(bh); |
e50e5129 AD |
2930 | return error; |
2931 | } | |
2932 | ||
0421a189 | 2933 | void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) |
e50e5129 | 2934 | { |
dec214d0 | 2935 | int idx; |
e50e5129 | 2936 | |
0421a189 | 2937 | if (ea_inode_array == NULL) |
e50e5129 AD |
2938 | return; |
2939 | ||
dec214d0 TE |
2940 | for (idx = 0; idx < ea_inode_array->count; ++idx) |
2941 | iput(ea_inode_array->inodes[idx]); | |
0421a189 | 2942 | kfree(ea_inode_array); |
ac27a0ec DK |
2943 | } |
2944 | ||
ac27a0ec | 2945 | /* |
47387409 | 2946 | * ext4_xattr_block_cache_insert() |
ac27a0ec | 2947 | * |
47387409 | 2948 | * Create a new entry in the extended attribute block cache, and insert |
ac27a0ec DK |
2949 | * it unless such an entry is already in the cache. |
2950 | * | |
2951 | * Returns 0, or a negative error number on failure. | |
2952 | */ | |
2953 | static void | |
47387409 TE |
2954 | ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, |
2955 | struct buffer_head *bh) | |
ac27a0ec | 2956 | { |
6048c64b AG |
2957 | struct ext4_xattr_header *header = BHDR(bh); |
2958 | __u32 hash = le32_to_cpu(header->h_hash); | |
2959 | int reusable = le32_to_cpu(header->h_refcount) < | |
2960 | EXT4_XATTR_REFCOUNT_MAX; | |
ac27a0ec DK |
2961 | int error; |
2962 | ||
cdb7ee4c TE |
2963 | if (!ea_block_cache) |
2964 | return; | |
47387409 | 2965 | error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, |
6048c64b | 2966 | bh->b_blocknr, reusable); |
ac27a0ec | 2967 | if (error) { |
82939d79 | 2968 | if (error == -EBUSY) |
ac27a0ec | 2969 | ea_bdebug(bh, "already in cache"); |
82939d79 | 2970 | } else |
ac27a0ec | 2971 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
2972 | } |
2973 | ||
2974 | /* | |
617ba13b | 2975 | * ext4_xattr_cmp() |
ac27a0ec DK |
2976 | * |
2977 | * Compare two extended attribute blocks for equality. | |
2978 | * | |
2979 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
2980 | * a negative error number on errors. | |
2981 | */ | |
2982 | static int | |
617ba13b MC |
2983 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
2984 | struct ext4_xattr_header *header2) | |
ac27a0ec | 2985 | { |
617ba13b | 2986 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
2987 | |
2988 | entry1 = ENTRY(header1+1); | |
2989 | entry2 = ENTRY(header2+1); | |
2990 | while (!IS_LAST_ENTRY(entry1)) { | |
2991 | if (IS_LAST_ENTRY(entry2)) | |
2992 | return 1; | |
2993 | if (entry1->e_hash != entry2->e_hash || | |
2994 | entry1->e_name_index != entry2->e_name_index || | |
2995 | entry1->e_name_len != entry2->e_name_len || | |
2996 | entry1->e_value_size != entry2->e_value_size || | |
e50e5129 | 2997 | entry1->e_value_inum != entry2->e_value_inum || |
ac27a0ec DK |
2998 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) |
2999 | return 1; | |
7cec1918 TE |
3000 | if (!entry1->e_value_inum && |
3001 | memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), | |
ac27a0ec DK |
3002 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), |
3003 | le32_to_cpu(entry1->e_value_size))) | |
3004 | return 1; | |
3005 | ||
617ba13b MC |
3006 | entry1 = EXT4_XATTR_NEXT(entry1); |
3007 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
3008 | } |
3009 | if (!IS_LAST_ENTRY(entry2)) | |
3010 | return 1; | |
3011 | return 0; | |
3012 | } | |
3013 | ||
3014 | /* | |
47387409 | 3015 | * ext4_xattr_block_cache_find() |
ac27a0ec DK |
3016 | * |
3017 | * Find an identical extended attribute block. | |
3018 | * | |
3019 | * Returns a pointer to the block found, or NULL if such a block was | |
3020 | * not found or an error occurred. | |
3021 | */ | |
3022 | static struct buffer_head * | |
47387409 TE |
3023 | ext4_xattr_block_cache_find(struct inode *inode, |
3024 | struct ext4_xattr_header *header, | |
3025 | struct mb_cache_entry **pce) | |
ac27a0ec DK |
3026 | { |
3027 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 | 3028 | struct mb_cache_entry *ce; |
47387409 | 3029 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec | 3030 | |
cdb7ee4c TE |
3031 | if (!ea_block_cache) |
3032 | return NULL; | |
ac27a0ec DK |
3033 | if (!header->h_hash) |
3034 | return NULL; /* never share */ | |
3035 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
47387409 | 3036 | ce = mb_cache_entry_find_first(ea_block_cache, hash); |
ac27a0ec DK |
3037 | while (ce) { |
3038 | struct buffer_head *bh; | |
3039 | ||
fb265c9c TT |
3040 | bh = ext4_sb_bread(inode->i_sb, ce->e_value, REQ_PRIO); |
3041 | if (IS_ERR(bh)) { | |
3042 | if (PTR_ERR(bh) == -ENOMEM) | |
3043 | return NULL; | |
7159a986 | 3044 | bh = NULL; |
24676da4 | 3045 | EXT4_ERROR_INODE(inode, "block %lu read error", |
c07dfcb4 | 3046 | (unsigned long)ce->e_value); |
617ba13b | 3047 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
ac27a0ec DK |
3048 | *pce = ce; |
3049 | return bh; | |
3050 | } | |
3051 | brelse(bh); | |
47387409 | 3052 | ce = mb_cache_entry_find_next(ea_block_cache, ce); |
ac27a0ec DK |
3053 | } |
3054 | return NULL; | |
3055 | } | |
3056 | ||
3057 | #define NAME_HASH_SHIFT 5 | |
3058 | #define VALUE_HASH_SHIFT 16 | |
3059 | ||
3060 | /* | |
617ba13b | 3061 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
3062 | * |
3063 | * Compute the hash of an extended attribute. | |
3064 | */ | |
b9fc761e TE |
3065 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
3066 | size_t value_count) | |
ac27a0ec DK |
3067 | { |
3068 | __u32 hash = 0; | |
ac27a0ec | 3069 | |
b9fc761e | 3070 | while (name_len--) { |
ac27a0ec DK |
3071 | hash = (hash << NAME_HASH_SHIFT) ^ |
3072 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
3073 | *name++; | |
3074 | } | |
b9fc761e TE |
3075 | while (value_count--) { |
3076 | hash = (hash << VALUE_HASH_SHIFT) ^ | |
3077 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
3078 | le32_to_cpu(*value++); | |
ac27a0ec | 3079 | } |
b9fc761e | 3080 | return cpu_to_le32(hash); |
ac27a0ec DK |
3081 | } |
3082 | ||
3083 | #undef NAME_HASH_SHIFT | |
3084 | #undef VALUE_HASH_SHIFT | |
3085 | ||
3086 | #define BLOCK_HASH_SHIFT 16 | |
3087 | ||
3088 | /* | |
617ba13b | 3089 | * ext4_xattr_rehash() |
ac27a0ec DK |
3090 | * |
3091 | * Re-compute the extended attribute hash value after an entry has changed. | |
3092 | */ | |
daf83281 | 3093 | static void ext4_xattr_rehash(struct ext4_xattr_header *header) |
ac27a0ec | 3094 | { |
617ba13b | 3095 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
3096 | __u32 hash = 0; |
3097 | ||
ac27a0ec DK |
3098 | here = ENTRY(header+1); |
3099 | while (!IS_LAST_ENTRY(here)) { | |
3100 | if (!here->e_hash) { | |
3101 | /* Block is not shared if an entry's hash value == 0 */ | |
3102 | hash = 0; | |
3103 | break; | |
3104 | } | |
3105 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
3106 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
3107 | le32_to_cpu(here->e_hash); | |
617ba13b | 3108 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
3109 | } |
3110 | header->h_hash = cpu_to_le32(hash); | |
3111 | } | |
3112 | ||
3113 | #undef BLOCK_HASH_SHIFT | |
3114 | ||
9c191f70 M |
3115 | #define HASH_BUCKET_BITS 10 |
3116 | ||
7a2508e1 | 3117 | struct mb_cache * |
82939d79 | 3118 | ext4_xattr_create_cache(void) |
ac27a0ec | 3119 | { |
7a2508e1 | 3120 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
3121 | } |
3122 | ||
7a2508e1 | 3123 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 3124 | { |
9c191f70 | 3125 | if (cache) |
7a2508e1 | 3126 | mb_cache_destroy(cache); |
ac27a0ec | 3127 | } |
9c191f70 | 3128 |