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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 | |
bab79b04 TE |
387 | inode = ext4_iget(parent->i_sb, ea_ino); |
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 | ||
525 | error = -ENODATA; | |
617ba13b | 526 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 527 | goto cleanup; |
ace36ad4 JP |
528 | ea_idebug(inode, "reading block %llu", |
529 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 530 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
531 | if (!bh) |
532 | goto cleanup; | |
533 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
534 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
de05ca85 TT |
535 | error = ext4_xattr_check_block(inode, bh); |
536 | if (error) | |
ac27a0ec | 537 | goto cleanup; |
47387409 | 538 | ext4_xattr_block_cache_insert(ea_block_cache, bh); |
ac27a0ec | 539 | entry = BFIRST(bh); |
9496005d TT |
540 | end = bh->b_data + bh->b_size; |
541 | error = xattr_find_entry(inode, &entry, end, name_index, name, 1); | |
ac27a0ec DK |
542 | if (error) |
543 | goto cleanup; | |
544 | size = le32_to_cpu(entry->e_value_size); | |
54dd0e0a TT |
545 | error = -ERANGE; |
546 | if (unlikely(size > EXT4_XATTR_SIZE_MAX)) | |
547 | goto cleanup; | |
ac27a0ec | 548 | if (buffer) { |
ac27a0ec DK |
549 | if (size > buffer_size) |
550 | goto cleanup; | |
e50e5129 | 551 | if (entry->e_value_inum) { |
b9fc761e TE |
552 | error = ext4_xattr_inode_get(inode, entry, buffer, |
553 | size); | |
e50e5129 AD |
554 | if (error) |
555 | goto cleanup; | |
556 | } else { | |
54dd0e0a TT |
557 | u16 offset = le16_to_cpu(entry->e_value_offs); |
558 | void *p = bh->b_data + offset; | |
559 | ||
560 | if (unlikely(p + size > end)) | |
561 | goto cleanup; | |
562 | memcpy(buffer, p, size); | |
e50e5129 | 563 | } |
ac27a0ec DK |
564 | } |
565 | error = size; | |
566 | ||
567 | cleanup: | |
568 | brelse(bh); | |
569 | return error; | |
570 | } | |
571 | ||
879b3825 | 572 | int |
617ba13b | 573 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
574 | void *buffer, size_t buffer_size) |
575 | { | |
617ba13b MC |
576 | struct ext4_xattr_ibody_header *header; |
577 | struct ext4_xattr_entry *entry; | |
578 | struct ext4_inode *raw_inode; | |
579 | struct ext4_iloc iloc; | |
ac27a0ec DK |
580 | size_t size; |
581 | void *end; | |
582 | int error; | |
583 | ||
19f5fb7a | 584 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 585 | return -ENODATA; |
617ba13b | 586 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
587 | if (error) |
588 | return error; | |
617ba13b | 589 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 590 | header = IHDR(inode, raw_inode); |
617ba13b | 591 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 592 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
593 | if (error) |
594 | goto cleanup; | |
6ba644b9 | 595 | entry = IFIRST(header); |
9496005d | 596 | error = xattr_find_entry(inode, &entry, end, name_index, name, 0); |
ac27a0ec DK |
597 | if (error) |
598 | goto cleanup; | |
599 | size = le32_to_cpu(entry->e_value_size); | |
54dd0e0a TT |
600 | error = -ERANGE; |
601 | if (unlikely(size > EXT4_XATTR_SIZE_MAX)) | |
602 | goto cleanup; | |
ac27a0ec | 603 | if (buffer) { |
ac27a0ec DK |
604 | if (size > buffer_size) |
605 | goto cleanup; | |
e50e5129 | 606 | if (entry->e_value_inum) { |
b9fc761e TE |
607 | error = ext4_xattr_inode_get(inode, entry, buffer, |
608 | size); | |
e50e5129 AD |
609 | if (error) |
610 | goto cleanup; | |
611 | } else { | |
54dd0e0a TT |
612 | u16 offset = le16_to_cpu(entry->e_value_offs); |
613 | void *p = (void *)IFIRST(header) + offset; | |
614 | ||
615 | if (unlikely(p + size > end)) | |
616 | goto cleanup; | |
617 | memcpy(buffer, p, size); | |
e50e5129 | 618 | } |
ac27a0ec DK |
619 | } |
620 | error = size; | |
621 | ||
622 | cleanup: | |
623 | brelse(iloc.bh); | |
624 | return error; | |
625 | } | |
626 | ||
627 | /* | |
617ba13b | 628 | * ext4_xattr_get() |
ac27a0ec DK |
629 | * |
630 | * Copy an extended attribute into the buffer | |
631 | * provided, or compute the buffer size required. | |
632 | * Buffer is NULL to compute the size of the buffer required. | |
633 | * | |
634 | * Returns a negative error number on failure, or the number of bytes | |
635 | * used / required on success. | |
636 | */ | |
637 | int | |
617ba13b | 638 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
639 | void *buffer, size_t buffer_size) |
640 | { | |
641 | int error; | |
642 | ||
0db1ff22 TT |
643 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
644 | return -EIO; | |
645 | ||
230b8c1a ZZ |
646 | if (strlen(name) > 255) |
647 | return -ERANGE; | |
648 | ||
617ba13b MC |
649 | down_read(&EXT4_I(inode)->xattr_sem); |
650 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
651 | buffer_size); |
652 | if (error == -ENODATA) | |
617ba13b | 653 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 654 | buffer_size); |
617ba13b | 655 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
656 | return error; |
657 | } | |
658 | ||
659 | static int | |
431547b3 | 660 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
661 | char *buffer, size_t buffer_size) |
662 | { | |
663 | size_t rest = buffer_size; | |
664 | ||
617ba13b | 665 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 666 | const struct xattr_handler *handler = |
617ba13b | 667 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec | 668 | |
764a5c6b AG |
669 | if (handler && (!handler->list || handler->list(dentry))) { |
670 | const char *prefix = handler->prefix ?: handler->name; | |
671 | size_t prefix_len = strlen(prefix); | |
672 | size_t size = prefix_len + entry->e_name_len + 1; | |
673 | ||
ac27a0ec DK |
674 | if (buffer) { |
675 | if (size > rest) | |
676 | return -ERANGE; | |
764a5c6b AG |
677 | memcpy(buffer, prefix, prefix_len); |
678 | buffer += prefix_len; | |
679 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
680 | buffer += entry->e_name_len; | |
681 | *buffer++ = 0; | |
ac27a0ec DK |
682 | } |
683 | rest -= size; | |
684 | } | |
685 | } | |
764a5c6b | 686 | return buffer_size - rest; /* total size */ |
ac27a0ec DK |
687 | } |
688 | ||
689 | static int | |
431547b3 | 690 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 691 | { |
2b0143b5 | 692 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
693 | struct buffer_head *bh = NULL; |
694 | int error; | |
695 | ||
696 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
697 | buffer, (long)buffer_size); | |
698 | ||
699 | error = 0; | |
617ba13b | 700 | if (!EXT4_I(inode)->i_file_acl) |
ac27a0ec | 701 | goto cleanup; |
ace36ad4 JP |
702 | ea_idebug(inode, "reading block %llu", |
703 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
617ba13b | 704 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
705 | error = -EIO; |
706 | if (!bh) | |
707 | goto cleanup; | |
708 | ea_bdebug(bh, "b_count=%d, refcount=%d", | |
709 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
de05ca85 TT |
710 | error = ext4_xattr_check_block(inode, bh); |
711 | if (error) | |
ac27a0ec | 712 | goto cleanup; |
47387409 | 713 | ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); |
431547b3 | 714 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); |
ac27a0ec DK |
715 | |
716 | cleanup: | |
717 | brelse(bh); | |
718 | ||
719 | return error; | |
720 | } | |
721 | ||
722 | static int | |
431547b3 | 723 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 724 | { |
2b0143b5 | 725 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
726 | struct ext4_xattr_ibody_header *header; |
727 | struct ext4_inode *raw_inode; | |
728 | struct ext4_iloc iloc; | |
ac27a0ec DK |
729 | void *end; |
730 | int error; | |
731 | ||
19f5fb7a | 732 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 733 | return 0; |
617ba13b | 734 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
735 | if (error) |
736 | return error; | |
617ba13b | 737 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 738 | header = IHDR(inode, raw_inode); |
617ba13b | 739 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 740 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
741 | if (error) |
742 | goto cleanup; | |
431547b3 | 743 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
744 | buffer, buffer_size); |
745 | ||
746 | cleanup: | |
747 | brelse(iloc.bh); | |
748 | return error; | |
749 | } | |
750 | ||
751 | /* | |
ba7ea1d8 EB |
752 | * Inode operation listxattr() |
753 | * | |
754 | * d_inode(dentry)->i_rwsem: don't care | |
ac27a0ec DK |
755 | * |
756 | * Copy a list of attribute names into the buffer | |
757 | * provided, or compute the buffer size required. | |
758 | * Buffer is NULL to compute the size of the buffer required. | |
759 | * | |
760 | * Returns a negative error number on failure, or the number of bytes | |
761 | * used / required on success. | |
762 | */ | |
ba7ea1d8 EB |
763 | ssize_t |
764 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
ac27a0ec | 765 | { |
eaeef867 | 766 | int ret, ret2; |
ac27a0ec | 767 | |
2b0143b5 | 768 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
769 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
770 | if (ret < 0) | |
771 | goto errout; | |
772 | if (buffer) { | |
773 | buffer += ret; | |
774 | buffer_size -= ret; | |
ac27a0ec | 775 | } |
eaeef867 TT |
776 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
777 | if (ret < 0) | |
778 | goto errout; | |
779 | ret += ret2; | |
780 | errout: | |
2b0143b5 | 781 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 782 | return ret; |
ac27a0ec DK |
783 | } |
784 | ||
785 | /* | |
617ba13b | 786 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
787 | * not set, set it. |
788 | */ | |
617ba13b | 789 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
790 | struct super_block *sb) |
791 | { | |
e2b911c5 | 792 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
793 | return; |
794 | ||
5d601255 | 795 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 796 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
e2b911c5 | 797 | ext4_set_feature_xattr(sb); |
a0375156 | 798 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec | 799 | } |
ac27a0ec DK |
800 | } |
801 | ||
7a9ca53a TE |
802 | int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) |
803 | { | |
804 | struct ext4_iloc iloc = { .bh = NULL }; | |
805 | struct buffer_head *bh = NULL; | |
806 | struct ext4_inode *raw_inode; | |
807 | struct ext4_xattr_ibody_header *header; | |
808 | struct ext4_xattr_entry *entry; | |
809 | qsize_t ea_inode_refs = 0; | |
810 | void *end; | |
811 | int ret; | |
812 | ||
813 | lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); | |
814 | ||
815 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
816 | ret = ext4_get_inode_loc(inode, &iloc); | |
817 | if (ret) | |
818 | goto out; | |
819 | raw_inode = ext4_raw_inode(&iloc); | |
820 | header = IHDR(inode, raw_inode); | |
821 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
822 | ret = xattr_check_inode(inode, header, end); | |
823 | if (ret) | |
824 | goto out; | |
825 | ||
826 | for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); | |
827 | entry = EXT4_XATTR_NEXT(entry)) | |
828 | if (entry->e_value_inum) | |
829 | ea_inode_refs++; | |
830 | } | |
831 | ||
832 | if (EXT4_I(inode)->i_file_acl) { | |
833 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
834 | if (!bh) { | |
835 | ret = -EIO; | |
836 | goto out; | |
837 | } | |
838 | ||
de05ca85 TT |
839 | ret = ext4_xattr_check_block(inode, bh); |
840 | if (ret) | |
7a9ca53a | 841 | goto out; |
7a9ca53a TE |
842 | |
843 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
844 | entry = EXT4_XATTR_NEXT(entry)) | |
845 | if (entry->e_value_inum) | |
846 | ea_inode_refs++; | |
847 | } | |
848 | *usage = ea_inode_refs + 1; | |
849 | ret = 0; | |
850 | out: | |
851 | brelse(iloc.bh); | |
852 | brelse(bh); | |
853 | return ret; | |
854 | } | |
855 | ||
dec214d0 TE |
856 | static inline size_t round_up_cluster(struct inode *inode, size_t length) |
857 | { | |
858 | struct super_block *sb = inode->i_sb; | |
859 | size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + | |
860 | inode->i_blkbits); | |
861 | size_t mask = ~(cluster_size - 1); | |
862 | ||
863 | return (length + cluster_size - 1) & mask; | |
864 | } | |
865 | ||
866 | static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) | |
867 | { | |
868 | int err; | |
869 | ||
870 | err = dquot_alloc_inode(inode); | |
871 | if (err) | |
872 | return err; | |
873 | err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); | |
874 | if (err) | |
875 | dquot_free_inode(inode); | |
876 | return err; | |
877 | } | |
878 | ||
a6d05676 TE |
879 | static void ext4_xattr_inode_free_quota(struct inode *parent, |
880 | struct inode *ea_inode, | |
881 | size_t len) | |
dec214d0 | 882 | { |
a6d05676 TE |
883 | if (ea_inode && |
884 | ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) | |
885 | return; | |
886 | dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); | |
887 | dquot_free_inode(parent); | |
dec214d0 TE |
888 | } |
889 | ||
af65207c TE |
890 | int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, |
891 | struct buffer_head *block_bh, size_t value_len, | |
892 | bool is_create) | |
dec214d0 | 893 | { |
dec214d0 TE |
894 | int credits; |
895 | int blocks; | |
896 | ||
897 | /* | |
898 | * 1) Owner inode update | |
899 | * 2) Ref count update on old xattr block | |
900 | * 3) new xattr block | |
901 | * 4) block bitmap update for new xattr block | |
902 | * 5) group descriptor for new xattr block | |
903 | * 6) block bitmap update for old xattr block | |
904 | * 7) group descriptor for old block | |
905 | * | |
906 | * 6 & 7 can happen if we have two racing threads T_a and T_b | |
907 | * which are each trying to set an xattr on inodes I_a and I_b | |
908 | * which were both initially sharing an xattr block. | |
909 | */ | |
910 | credits = 7; | |
911 | ||
912 | /* Quota updates. */ | |
913 | credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); | |
914 | ||
915 | /* | |
916 | * In case of inline data, we may push out the data to a block, | |
917 | * so we need to reserve credits for this eventuality | |
918 | */ | |
af65207c | 919 | if (inode && ext4_has_inline_data(inode)) |
dec214d0 TE |
920 | credits += ext4_writepage_trans_blocks(inode) + 1; |
921 | ||
922 | /* We are done if ea_inode feature is not enabled. */ | |
923 | if (!ext4_has_feature_ea_inode(sb)) | |
924 | return credits; | |
925 | ||
926 | /* New ea_inode, inode map, block bitmap, group descriptor. */ | |
927 | credits += 4; | |
928 | ||
929 | /* Data blocks. */ | |
930 | blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; | |
931 | ||
932 | /* Indirection block or one level of extent tree. */ | |
933 | blocks += 1; | |
934 | ||
935 | /* Block bitmap and group descriptor updates for each block. */ | |
936 | credits += blocks * 2; | |
937 | ||
938 | /* Blocks themselves. */ | |
939 | credits += blocks; | |
940 | ||
af65207c TE |
941 | if (!is_create) { |
942 | /* Dereference ea_inode holding old xattr value. | |
943 | * Old ea_inode, inode map, block bitmap, group descriptor. | |
944 | */ | |
945 | credits += 4; | |
dec214d0 | 946 | |
af65207c TE |
947 | /* Data blocks for old ea_inode. */ |
948 | blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; | |
dec214d0 | 949 | |
af65207c TE |
950 | /* Indirection block or one level of extent tree for old |
951 | * ea_inode. | |
952 | */ | |
953 | blocks += 1; | |
dec214d0 | 954 | |
af65207c TE |
955 | /* Block bitmap and group descriptor updates for each block. */ |
956 | credits += blocks * 2; | |
957 | } | |
dec214d0 TE |
958 | |
959 | /* We may need to clone the existing xattr block in which case we need | |
960 | * to increment ref counts for existing ea_inodes referenced by it. | |
961 | */ | |
962 | if (block_bh) { | |
963 | struct ext4_xattr_entry *entry = BFIRST(block_bh); | |
964 | ||
965 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) | |
966 | if (entry->e_value_inum) | |
967 | /* Ref count update on ea_inode. */ | |
968 | credits += 1; | |
969 | } | |
970 | return credits; | |
971 | } | |
972 | ||
30a7eb97 TE |
973 | static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode, |
974 | int credits, struct buffer_head *bh, | |
975 | bool dirty, bool block_csum) | |
976 | { | |
977 | int error; | |
978 | ||
979 | if (!ext4_handle_valid(handle)) | |
980 | return 0; | |
981 | ||
982 | if (handle->h_buffer_credits >= credits) | |
983 | return 0; | |
984 | ||
985 | error = ext4_journal_extend(handle, credits - handle->h_buffer_credits); | |
986 | if (!error) | |
987 | return 0; | |
988 | if (error < 0) { | |
989 | ext4_warning(inode->i_sb, "Extend journal (error %d)", error); | |
990 | return error; | |
991 | } | |
992 | ||
993 | if (bh && dirty) { | |
994 | if (block_csum) | |
995 | ext4_xattr_block_csum_set(inode, bh); | |
996 | error = ext4_handle_dirty_metadata(handle, NULL, bh); | |
997 | if (error) { | |
998 | ext4_warning(inode->i_sb, "Handle metadata (error %d)", | |
999 | error); | |
1000 | return error; | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | error = ext4_journal_restart(handle, credits); | |
1005 | if (error) { | |
1006 | ext4_warning(inode->i_sb, "Restart journal (error %d)", error); | |
1007 | return error; | |
1008 | } | |
1009 | ||
1010 | if (bh) { | |
1011 | error = ext4_journal_get_write_access(handle, bh); | |
1012 | if (error) { | |
1013 | ext4_warning(inode->i_sb, | |
1014 | "Get write access failed (error %d)", | |
1015 | error); | |
1016 | return error; | |
1017 | } | |
1018 | } | |
1019 | return 0; | |
1020 | } | |
1021 | ||
dec214d0 TE |
1022 | static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, |
1023 | int ref_change) | |
1024 | { | |
1025 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); | |
1026 | struct ext4_iloc iloc; | |
1027 | s64 ref_count; | |
1028 | u32 hash; | |
1029 | int ret; | |
1030 | ||
1031 | inode_lock(ea_inode); | |
1032 | ||
1033 | ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); | |
1bfc204d | 1034 | if (ret) |
dec214d0 | 1035 | goto out; |
dec214d0 TE |
1036 | |
1037 | ref_count = ext4_xattr_inode_get_ref(ea_inode); | |
1038 | ref_count += ref_change; | |
1039 | ext4_xattr_inode_set_ref(ea_inode, ref_count); | |
1040 | ||
1041 | if (ref_change > 0) { | |
1042 | WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", | |
1043 | ea_inode->i_ino, ref_count); | |
1044 | ||
1045 | if (ref_count == 1) { | |
1046 | WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", | |
1047 | ea_inode->i_ino, ea_inode->i_nlink); | |
1048 | ||
1049 | set_nlink(ea_inode, 1); | |
1050 | ext4_orphan_del(handle, ea_inode); | |
1051 | ||
cdb7ee4c TE |
1052 | if (ea_inode_cache) { |
1053 | hash = ext4_xattr_inode_get_hash(ea_inode); | |
1054 | mb_cache_entry_create(ea_inode_cache, | |
1055 | GFP_NOFS, hash, | |
1056 | ea_inode->i_ino, | |
1057 | true /* reusable */); | |
1058 | } | |
dec214d0 TE |
1059 | } |
1060 | } else { | |
1061 | WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", | |
1062 | ea_inode->i_ino, ref_count); | |
1063 | ||
1064 | if (ref_count == 0) { | |
1065 | WARN_ONCE(ea_inode->i_nlink != 1, | |
1066 | "EA inode %lu i_nlink=%u", | |
1067 | ea_inode->i_ino, ea_inode->i_nlink); | |
1068 | ||
1069 | clear_nlink(ea_inode); | |
1070 | ext4_orphan_add(handle, ea_inode); | |
1071 | ||
cdb7ee4c TE |
1072 | if (ea_inode_cache) { |
1073 | hash = ext4_xattr_inode_get_hash(ea_inode); | |
1074 | mb_cache_entry_delete(ea_inode_cache, hash, | |
1075 | ea_inode->i_ino); | |
1076 | } | |
dec214d0 TE |
1077 | } |
1078 | } | |
1079 | ||
1080 | ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); | |
dec214d0 TE |
1081 | if (ret) |
1082 | ext4_warning_inode(ea_inode, | |
1083 | "ext4_mark_iloc_dirty() failed ret=%d", ret); | |
1084 | out: | |
dec214d0 TE |
1085 | inode_unlock(ea_inode); |
1086 | return ret; | |
1087 | } | |
1088 | ||
1089 | static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) | |
1090 | { | |
1091 | return ext4_xattr_inode_update_ref(handle, ea_inode, 1); | |
1092 | } | |
1093 | ||
1094 | static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) | |
1095 | { | |
1096 | return ext4_xattr_inode_update_ref(handle, ea_inode, -1); | |
1097 | } | |
1098 | ||
1099 | static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, | |
1100 | struct ext4_xattr_entry *first) | |
1101 | { | |
1102 | struct inode *ea_inode; | |
1103 | struct ext4_xattr_entry *entry; | |
1104 | struct ext4_xattr_entry *failed_entry; | |
1105 | unsigned int ea_ino; | |
1106 | int err, saved_err; | |
1107 | ||
1108 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1109 | entry = EXT4_XATTR_NEXT(entry)) { | |
1110 | if (!entry->e_value_inum) | |
1111 | continue; | |
1112 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1113 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1114 | le32_to_cpu(entry->e_hash), | |
1115 | &ea_inode); | |
dec214d0 TE |
1116 | if (err) |
1117 | goto cleanup; | |
1118 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1119 | if (err) { | |
1120 | ext4_warning_inode(ea_inode, "inc ref error %d", err); | |
1121 | iput(ea_inode); | |
1122 | goto cleanup; | |
1123 | } | |
1124 | iput(ea_inode); | |
1125 | } | |
1126 | return 0; | |
1127 | ||
1128 | cleanup: | |
1129 | saved_err = err; | |
1130 | failed_entry = entry; | |
1131 | ||
1132 | for (entry = first; entry != failed_entry; | |
1133 | entry = EXT4_XATTR_NEXT(entry)) { | |
1134 | if (!entry->e_value_inum) | |
1135 | continue; | |
1136 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1137 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1138 | le32_to_cpu(entry->e_hash), | |
1139 | &ea_inode); | |
dec214d0 TE |
1140 | if (err) { |
1141 | ext4_warning(parent->i_sb, | |
1142 | "cleanup ea_ino %u iget error %d", ea_ino, | |
1143 | err); | |
1144 | continue; | |
1145 | } | |
1146 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1147 | if (err) | |
1148 | ext4_warning_inode(ea_inode, "cleanup dec ref error %d", | |
1149 | err); | |
1150 | iput(ea_inode); | |
1151 | } | |
1152 | return saved_err; | |
1153 | } | |
1154 | ||
30a7eb97 | 1155 | static void |
dec214d0 TE |
1156 | ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, |
1157 | struct buffer_head *bh, | |
1158 | struct ext4_xattr_entry *first, bool block_csum, | |
1159 | struct ext4_xattr_inode_array **ea_inode_array, | |
1160 | int extra_credits, bool skip_quota) | |
30a7eb97 TE |
1161 | { |
1162 | struct inode *ea_inode; | |
1163 | struct ext4_xattr_entry *entry; | |
1164 | bool dirty = false; | |
1165 | unsigned int ea_ino; | |
1166 | int err; | |
1167 | int credits; | |
1168 | ||
1169 | /* One credit for dec ref on ea_inode, one for orphan list addition, */ | |
1170 | credits = 2 + extra_credits; | |
1171 | ||
1172 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1173 | entry = EXT4_XATTR_NEXT(entry)) { | |
1174 | if (!entry->e_value_inum) | |
1175 | continue; | |
1176 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1177 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1178 | le32_to_cpu(entry->e_hash), | |
1179 | &ea_inode); | |
30a7eb97 TE |
1180 | if (err) |
1181 | continue; | |
1182 | ||
1183 | err = ext4_expand_inode_array(ea_inode_array, ea_inode); | |
1184 | if (err) { | |
1185 | ext4_warning_inode(ea_inode, | |
1186 | "Expand inode array err=%d", err); | |
1187 | iput(ea_inode); | |
1188 | continue; | |
1189 | } | |
1190 | ||
1191 | err = ext4_xattr_ensure_credits(handle, parent, credits, bh, | |
1192 | dirty, block_csum); | |
1193 | if (err) { | |
1194 | ext4_warning_inode(ea_inode, "Ensure credits err=%d", | |
1195 | err); | |
1196 | continue; | |
1197 | } | |
1198 | ||
dec214d0 TE |
1199 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); |
1200 | if (err) { | |
1201 | ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", | |
1202 | err); | |
1203 | continue; | |
1204 | } | |
1205 | ||
1206 | if (!skip_quota) | |
a6d05676 | 1207 | ext4_xattr_inode_free_quota(parent, ea_inode, |
dec214d0 | 1208 | le32_to_cpu(entry->e_value_size)); |
30a7eb97 TE |
1209 | |
1210 | /* | |
1211 | * Forget about ea_inode within the same transaction that | |
1212 | * decrements the ref count. This avoids duplicate decrements in | |
1213 | * case the rest of the work spills over to subsequent | |
1214 | * transactions. | |
1215 | */ | |
1216 | entry->e_value_inum = 0; | |
1217 | entry->e_value_size = 0; | |
1218 | ||
1219 | dirty = true; | |
1220 | } | |
1221 | ||
1222 | if (dirty) { | |
1223 | /* | |
1224 | * Note that we are deliberately skipping csum calculation for | |
1225 | * the final update because we do not expect any journal | |
1226 | * restarts until xattr block is freed. | |
1227 | */ | |
1228 | ||
1229 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
1230 | if (err) | |
1231 | ext4_warning_inode(parent, | |
1232 | "handle dirty metadata err=%d", err); | |
1233 | } | |
1234 | } | |
1235 | ||
ac27a0ec | 1236 | /* |
ec4cb1aa JK |
1237 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
1238 | * otherwise free the block. | |
ac27a0ec DK |
1239 | */ |
1240 | static void | |
617ba13b | 1241 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
dec214d0 TE |
1242 | struct buffer_head *bh, |
1243 | struct ext4_xattr_inode_array **ea_inode_array, | |
1244 | int extra_credits) | |
ac27a0ec | 1245 | { |
47387409 | 1246 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
6048c64b | 1247 | u32 hash, ref; |
8a2bfdcb | 1248 | int error = 0; |
ac27a0ec | 1249 | |
5d601255 | 1250 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
1251 | error = ext4_journal_get_write_access(handle, bh); |
1252 | if (error) | |
1253 | goto out; | |
1254 | ||
1255 | lock_buffer(bh); | |
6048c64b AG |
1256 | hash = le32_to_cpu(BHDR(bh)->h_hash); |
1257 | ref = le32_to_cpu(BHDR(bh)->h_refcount); | |
1258 | if (ref == 1) { | |
ac27a0ec | 1259 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
1260 | /* |
1261 | * This must happen under buffer lock for | |
1262 | * ext4_xattr_block_set() to reliably detect freed block | |
1263 | */ | |
cdb7ee4c TE |
1264 | if (ea_block_cache) |
1265 | mb_cache_entry_delete(ea_block_cache, hash, | |
1266 | bh->b_blocknr); | |
ac27a0ec | 1267 | get_bh(bh); |
ec4cb1aa | 1268 | unlock_buffer(bh); |
dec214d0 TE |
1269 | |
1270 | if (ext4_has_feature_ea_inode(inode->i_sb)) | |
1271 | ext4_xattr_inode_dec_ref_all(handle, inode, bh, | |
1272 | BFIRST(bh), | |
1273 | true /* block_csum */, | |
1274 | ea_inode_array, | |
1275 | extra_credits, | |
1276 | true /* skip_quota */); | |
e6362609 TT |
1277 | ext4_free_blocks(handle, inode, bh, 0, 1, |
1278 | EXT4_FREE_BLOCKS_METADATA | | |
1279 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 1280 | } else { |
6048c64b AG |
1281 | ref--; |
1282 | BHDR(bh)->h_refcount = cpu_to_le32(ref); | |
1283 | if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { | |
1284 | struct mb_cache_entry *ce; | |
1285 | ||
cdb7ee4c TE |
1286 | if (ea_block_cache) { |
1287 | ce = mb_cache_entry_get(ea_block_cache, hash, | |
1288 | bh->b_blocknr); | |
1289 | if (ce) { | |
1290 | ce->e_reusable = 1; | |
1291 | mb_cache_entry_put(ea_block_cache, ce); | |
1292 | } | |
6048c64b AG |
1293 | } |
1294 | } | |
1295 | ||
dac7a4b4 | 1296 | ext4_xattr_block_csum_set(inode, bh); |
ec4cb1aa JK |
1297 | /* |
1298 | * Beware of this ugliness: Releasing of xattr block references | |
1299 | * from different inodes can race and so we have to protect | |
1300 | * from a race where someone else frees the block (and releases | |
1301 | * its journal_head) before we are done dirtying the buffer. In | |
1302 | * nojournal mode this race is harmless and we actually cannot | |
dac7a4b4 | 1303 | * call ext4_handle_dirty_metadata() with locked buffer as |
ec4cb1aa JK |
1304 | * that function can call sync_dirty_buffer() so for that case |
1305 | * we handle the dirtying after unlocking the buffer. | |
1306 | */ | |
1307 | if (ext4_handle_valid(handle)) | |
dac7a4b4 | 1308 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
c1bb05a6 | 1309 | unlock_buffer(bh); |
ec4cb1aa | 1310 | if (!ext4_handle_valid(handle)) |
dac7a4b4 | 1311 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
8a2bfdcb | 1312 | if (IS_SYNC(inode)) |
0390131b | 1313 | ext4_handle_sync(handle); |
1231b3a1 | 1314 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
1315 | ea_bdebug(bh, "refcount now=%d; releasing", |
1316 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 1317 | } |
8a2bfdcb MC |
1318 | out: |
1319 | ext4_std_error(inode->i_sb, error); | |
1320 | return; | |
ac27a0ec DK |
1321 | } |
1322 | ||
6dd4ee7c KS |
1323 | /* |
1324 | * Find the available free space for EAs. This also returns the total number of | |
1325 | * bytes used by EA entries. | |
1326 | */ | |
1327 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
1328 | size_t *min_offs, void *base, int *total) | |
1329 | { | |
1330 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 1331 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
1332 | size_t offs = le16_to_cpu(last->e_value_offs); |
1333 | if (offs < *min_offs) | |
1334 | *min_offs = offs; | |
1335 | } | |
7b1b2c1b TT |
1336 | if (total) |
1337 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
1338 | } |
1339 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
1340 | } | |
1341 | ||
e50e5129 AD |
1342 | /* |
1343 | * Write the value of the EA in an inode. | |
1344 | */ | |
1345 | static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, | |
1346 | const void *buf, int bufsize) | |
1347 | { | |
1348 | struct buffer_head *bh = NULL; | |
1349 | unsigned long block = 0; | |
dec214d0 TE |
1350 | int blocksize = ea_inode->i_sb->s_blocksize; |
1351 | int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; | |
e50e5129 AD |
1352 | int csize, wsize = 0; |
1353 | int ret = 0; | |
1354 | int retries = 0; | |
1355 | ||
1356 | retry: | |
1357 | while (ret >= 0 && ret < max_blocks) { | |
1358 | struct ext4_map_blocks map; | |
1359 | map.m_lblk = block += ret; | |
1360 | map.m_len = max_blocks -= ret; | |
1361 | ||
1362 | ret = ext4_map_blocks(handle, ea_inode, &map, | |
1363 | EXT4_GET_BLOCKS_CREATE); | |
1364 | if (ret <= 0) { | |
1365 | ext4_mark_inode_dirty(handle, ea_inode); | |
1366 | if (ret == -ENOSPC && | |
1367 | ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { | |
1368 | ret = 0; | |
1369 | goto retry; | |
1370 | } | |
1371 | break; | |
1372 | } | |
1373 | } | |
1374 | ||
1375 | if (ret < 0) | |
1376 | return ret; | |
1377 | ||
1378 | block = 0; | |
1379 | while (wsize < bufsize) { | |
1380 | if (bh != NULL) | |
1381 | brelse(bh); | |
1382 | csize = (bufsize - wsize) > blocksize ? blocksize : | |
1383 | bufsize - wsize; | |
1384 | bh = ext4_getblk(handle, ea_inode, block, 0); | |
1385 | if (IS_ERR(bh)) | |
1386 | return PTR_ERR(bh); | |
1387 | ret = ext4_journal_get_write_access(handle, bh); | |
1388 | if (ret) | |
1389 | goto out; | |
1390 | ||
1391 | memcpy(bh->b_data, buf, csize); | |
1392 | set_buffer_uptodate(bh); | |
1393 | ext4_handle_dirty_metadata(handle, ea_inode, bh); | |
1394 | ||
1395 | buf += csize; | |
1396 | wsize += csize; | |
1397 | block += 1; | |
1398 | } | |
1399 | ||
1400 | inode_lock(ea_inode); | |
1401 | i_size_write(ea_inode, wsize); | |
1402 | ext4_update_i_disksize(ea_inode, wsize); | |
1403 | inode_unlock(ea_inode); | |
1404 | ||
1405 | ext4_mark_inode_dirty(handle, ea_inode); | |
1406 | ||
1407 | out: | |
1408 | brelse(bh); | |
1409 | ||
1410 | return ret; | |
1411 | } | |
1412 | ||
1413 | /* | |
1414 | * Create an inode to store the value of a large EA. | |
1415 | */ | |
1416 | static struct inode *ext4_xattr_inode_create(handle_t *handle, | |
dec214d0 | 1417 | struct inode *inode, u32 hash) |
e50e5129 AD |
1418 | { |
1419 | struct inode *ea_inode = NULL; | |
9e1ba001 | 1420 | uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; |
bd3b963b | 1421 | int err; |
e50e5129 AD |
1422 | |
1423 | /* | |
1424 | * Let the next inode be the goal, so we try and allocate the EA inode | |
1425 | * in the same group, or nearby one. | |
1426 | */ | |
1427 | ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, | |
9e1ba001 | 1428 | S_IFREG | 0600, NULL, inode->i_ino + 1, owner, |
1b917ed8 | 1429 | EXT4_EA_INODE_FL); |
e50e5129 AD |
1430 | if (!IS_ERR(ea_inode)) { |
1431 | ea_inode->i_op = &ext4_file_inode_operations; | |
1432 | ea_inode->i_fop = &ext4_file_operations; | |
1433 | ext4_set_aops(ea_inode); | |
33d201e0 | 1434 | ext4_xattr_inode_set_class(ea_inode); |
e50e5129 | 1435 | unlock_new_inode(ea_inode); |
dec214d0 TE |
1436 | ext4_xattr_inode_set_ref(ea_inode, 1); |
1437 | ext4_xattr_inode_set_hash(ea_inode, hash); | |
1438 | err = ext4_mark_inode_dirty(handle, ea_inode); | |
1439 | if (!err) | |
1440 | err = ext4_inode_attach_jinode(ea_inode); | |
bd3b963b TE |
1441 | if (err) { |
1442 | iput(ea_inode); | |
1443 | return ERR_PTR(err); | |
1444 | } | |
dec214d0 TE |
1445 | |
1446 | /* | |
1447 | * Xattr inodes are shared therefore quota charging is performed | |
1448 | * at a higher level. | |
1449 | */ | |
1450 | dquot_free_inode(ea_inode); | |
1451 | dquot_drop(ea_inode); | |
1452 | inode_lock(ea_inode); | |
1453 | ea_inode->i_flags |= S_NOQUOTA; | |
1454 | inode_unlock(ea_inode); | |
e50e5129 AD |
1455 | } |
1456 | ||
1457 | return ea_inode; | |
1458 | } | |
1459 | ||
dec214d0 TE |
1460 | static struct inode * |
1461 | ext4_xattr_inode_cache_find(struct inode *inode, const void *value, | |
1462 | size_t value_len, u32 hash) | |
e50e5129 | 1463 | { |
dec214d0 TE |
1464 | struct inode *ea_inode; |
1465 | struct mb_cache_entry *ce; | |
1466 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); | |
1467 | void *ea_data; | |
1468 | ||
cdb7ee4c TE |
1469 | if (!ea_inode_cache) |
1470 | return NULL; | |
1471 | ||
dec214d0 TE |
1472 | ce = mb_cache_entry_find_first(ea_inode_cache, hash); |
1473 | if (!ce) | |
1474 | return NULL; | |
1475 | ||
1476 | ea_data = ext4_kvmalloc(value_len, GFP_NOFS); | |
1477 | if (!ea_data) { | |
1478 | mb_cache_entry_put(ea_inode_cache, ce); | |
1479 | return NULL; | |
1480 | } | |
e50e5129 | 1481 | |
dec214d0 TE |
1482 | while (ce) { |
1483 | ea_inode = ext4_iget(inode->i_sb, ce->e_value); | |
1484 | if (!IS_ERR(ea_inode) && | |
1485 | !is_bad_inode(ea_inode) && | |
1486 | (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && | |
1487 | i_size_read(ea_inode) == value_len && | |
1488 | !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && | |
b9fc761e TE |
1489 | !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, |
1490 | value_len) && | |
dec214d0 TE |
1491 | !memcmp(value, ea_data, value_len)) { |
1492 | mb_cache_entry_touch(ea_inode_cache, ce); | |
1493 | mb_cache_entry_put(ea_inode_cache, ce); | |
1494 | kvfree(ea_data); | |
1495 | return ea_inode; | |
1496 | } | |
e50e5129 | 1497 | |
dec214d0 TE |
1498 | if (!IS_ERR(ea_inode)) |
1499 | iput(ea_inode); | |
1500 | ce = mb_cache_entry_find_next(ea_inode_cache, ce); | |
1501 | } | |
1502 | kvfree(ea_data); | |
1503 | return NULL; | |
e50e5129 AD |
1504 | } |
1505 | ||
1506 | /* | |
1507 | * Add value of the EA in an inode. | |
1508 | */ | |
dec214d0 TE |
1509 | static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, |
1510 | const void *value, size_t value_len, | |
1511 | struct inode **ret_inode) | |
e50e5129 AD |
1512 | { |
1513 | struct inode *ea_inode; | |
dec214d0 | 1514 | u32 hash; |
e50e5129 AD |
1515 | int err; |
1516 | ||
dec214d0 TE |
1517 | hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); |
1518 | ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); | |
1519 | if (ea_inode) { | |
1520 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1521 | if (err) { | |
1522 | iput(ea_inode); | |
1523 | return err; | |
1524 | } | |
1525 | ||
1526 | *ret_inode = ea_inode; | |
1527 | return 0; | |
1528 | } | |
1529 | ||
e50e5129 | 1530 | /* Create an inode for the EA value */ |
dec214d0 | 1531 | ea_inode = ext4_xattr_inode_create(handle, inode, hash); |
e50e5129 AD |
1532 | if (IS_ERR(ea_inode)) |
1533 | return PTR_ERR(ea_inode); | |
1534 | ||
1535 | err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); | |
dec214d0 TE |
1536 | if (err) { |
1537 | ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1538 | iput(ea_inode); | |
1539 | return err; | |
1540 | } | |
e50e5129 | 1541 | |
cdb7ee4c TE |
1542 | if (EA_INODE_CACHE(inode)) |
1543 | mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, | |
1544 | ea_inode->i_ino, true /* reusable */); | |
e50e5129 | 1545 | |
dec214d0 TE |
1546 | *ret_inode = ea_inode; |
1547 | return 0; | |
e50e5129 AD |
1548 | } |
1549 | ||
9c6e7853 TE |
1550 | /* |
1551 | * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode | |
1552 | * feature is enabled. | |
1553 | */ | |
1554 | #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) | |
1555 | ||
e50e5129 AD |
1556 | static int ext4_xattr_set_entry(struct ext4_xattr_info *i, |
1557 | struct ext4_xattr_search *s, | |
daf83281 TE |
1558 | handle_t *handle, struct inode *inode, |
1559 | bool is_block) | |
ac27a0ec | 1560 | { |
5369a762 | 1561 | struct ext4_xattr_entry *last, *next; |
dec214d0 TE |
1562 | struct ext4_xattr_entry *here = s->here; |
1563 | size_t min_offs = s->end - s->base, name_len = strlen(i->name); | |
e50e5129 | 1564 | int in_inode = i->in_inode; |
dec214d0 TE |
1565 | struct inode *old_ea_inode = NULL; |
1566 | struct inode *new_ea_inode = NULL; | |
1567 | size_t old_size, new_size; | |
1568 | int ret; | |
1569 | ||
1570 | /* Space used by old and new values. */ | |
1571 | old_size = (!s->not_found && !here->e_value_inum) ? | |
1572 | EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; | |
1573 | new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; | |
1574 | ||
1575 | /* | |
1576 | * Optimization for the simple case when old and new values have the | |
1577 | * same padded sizes. Not applicable if external inodes are involved. | |
1578 | */ | |
1579 | if (new_size && new_size == old_size) { | |
1580 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1581 | void *val = s->base + offs; | |
1582 | ||
1583 | here->e_value_size = cpu_to_le32(i->value_len); | |
1584 | if (i->value == EXT4_ZERO_XATTR_VALUE) { | |
1585 | memset(val, 0, new_size); | |
1586 | } else { | |
1587 | memcpy(val, i->value, i->value_len); | |
1588 | /* Clear padding bytes. */ | |
1589 | memset(val + i->value_len, 0, new_size - i->value_len); | |
1590 | } | |
32aaf194 | 1591 | goto update_hash; |
dec214d0 | 1592 | } |
e50e5129 | 1593 | |
ac27a0ec DK |
1594 | /* Compute min_offs and last. */ |
1595 | last = s->first; | |
5369a762 TT |
1596 | for (; !IS_LAST_ENTRY(last); last = next) { |
1597 | next = EXT4_XATTR_NEXT(last); | |
1598 | if ((void *)next >= s->end) { | |
1599 | EXT4_ERROR_INODE(inode, "corrupted xattr entries"); | |
1600 | ret = -EFSCORRUPTED; | |
1601 | goto out; | |
1602 | } | |
e50e5129 | 1603 | if (!last->e_value_inum && last->e_value_size) { |
ac27a0ec DK |
1604 | size_t offs = le16_to_cpu(last->e_value_offs); |
1605 | if (offs < min_offs) | |
1606 | min_offs = offs; | |
1607 | } | |
1608 | } | |
dec214d0 TE |
1609 | |
1610 | /* Check whether we have enough space. */ | |
ac27a0ec | 1611 | if (i->value) { |
dec214d0 | 1612 | size_t free; |
e50e5129 | 1613 | |
dec214d0 TE |
1614 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); |
1615 | if (!s->not_found) | |
1616 | free += EXT4_XATTR_LEN(name_len) + old_size; | |
e50e5129 | 1617 | |
dec214d0 TE |
1618 | if (free < EXT4_XATTR_LEN(name_len) + new_size) { |
1619 | ret = -ENOSPC; | |
1620 | goto out; | |
1621 | } | |
9c6e7853 TE |
1622 | |
1623 | /* | |
1624 | * If storing the value in an external inode is an option, | |
1625 | * reserve space for xattr entries/names in the external | |
1626 | * attribute block so that a long value does not occupy the | |
1627 | * whole space and prevent futher entries being added. | |
1628 | */ | |
daf83281 TE |
1629 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
1630 | new_size && is_block && | |
9c6e7853 TE |
1631 | (min_offs + old_size - new_size) < |
1632 | EXT4_XATTR_BLOCK_RESERVE(inode)) { | |
1633 | ret = -ENOSPC; | |
1634 | goto out; | |
1635 | } | |
ac27a0ec DK |
1636 | } |
1637 | ||
dec214d0 TE |
1638 | /* |
1639 | * Getting access to old and new ea inodes is subject to failures. | |
1640 | * Finish that work before doing any modifications to the xattr data. | |
1641 | */ | |
1642 | if (!s->not_found && here->e_value_inum) { | |
1643 | ret = ext4_xattr_inode_iget(inode, | |
1644 | le32_to_cpu(here->e_value_inum), | |
a6d05676 | 1645 | le32_to_cpu(here->e_hash), |
dec214d0 TE |
1646 | &old_ea_inode); |
1647 | if (ret) { | |
1648 | old_ea_inode = NULL; | |
1649 | goto out; | |
1650 | } | |
1651 | } | |
1652 | if (i->value && in_inode) { | |
1653 | WARN_ON_ONCE(!i->value_len); | |
ac27a0ec | 1654 | |
dec214d0 TE |
1655 | ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); |
1656 | if (ret) | |
1657 | goto out; | |
1658 | ||
1659 | ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, | |
1660 | i->value_len, | |
1661 | &new_ea_inode); | |
1662 | if (ret) { | |
1663 | new_ea_inode = NULL; | |
a6d05676 | 1664 | ext4_xattr_inode_free_quota(inode, NULL, i->value_len); |
dec214d0 | 1665 | goto out; |
ac27a0ec | 1666 | } |
dec214d0 TE |
1667 | } |
1668 | ||
1669 | if (old_ea_inode) { | |
1670 | /* We are ready to release ref count on the old_ea_inode. */ | |
1671 | ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); | |
1672 | if (ret) { | |
1673 | /* Release newly required ref count on new_ea_inode. */ | |
1674 | if (new_ea_inode) { | |
1675 | int err; | |
1676 | ||
1677 | err = ext4_xattr_inode_dec_ref(handle, | |
1678 | new_ea_inode); | |
1679 | if (err) | |
1680 | ext4_warning_inode(new_ea_inode, | |
1681 | "dec ref new_ea_inode err=%d", | |
1682 | err); | |
a6d05676 | 1683 | ext4_xattr_inode_free_quota(inode, new_ea_inode, |
dec214d0 TE |
1684 | i->value_len); |
1685 | } | |
1686 | goto out; | |
e50e5129 | 1687 | } |
dec214d0 | 1688 | |
a6d05676 | 1689 | ext4_xattr_inode_free_quota(inode, old_ea_inode, |
dec214d0 TE |
1690 | le32_to_cpu(here->e_value_size)); |
1691 | } | |
1692 | ||
1693 | /* No failures allowed past this point. */ | |
1694 | ||
8a2b307c | 1695 | if (!s->not_found && here->e_value_size && here->e_value_offs) { |
dec214d0 TE |
1696 | /* Remove the old value. */ |
1697 | void *first_val = s->base + min_offs; | |
1698 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1699 | void *val = s->base + offs; | |
1700 | ||
1701 | memmove(first_val + old_size, first_val, val - first_val); | |
1702 | memset(first_val, 0, old_size); | |
1703 | min_offs += old_size; | |
1704 | ||
1705 | /* Adjust all value offsets. */ | |
1706 | last = s->first; | |
1707 | while (!IS_LAST_ENTRY(last)) { | |
1708 | size_t o = le16_to_cpu(last->e_value_offs); | |
1709 | ||
1710 | if (!last->e_value_inum && | |
1711 | last->e_value_size && o < offs) | |
1712 | last->e_value_offs = cpu_to_le16(o + old_size); | |
1713 | last = EXT4_XATTR_NEXT(last); | |
ac27a0ec DK |
1714 | } |
1715 | } | |
1716 | ||
dec214d0 TE |
1717 | if (!i->value) { |
1718 | /* Remove old name. */ | |
1719 | size_t size = EXT4_XATTR_LEN(name_len); | |
1720 | ||
1721 | last = ENTRY((void *)last - size); | |
1722 | memmove(here, (void *)here + size, | |
1723 | (void *)last - (void *)here + sizeof(__u32)); | |
1724 | memset(last, 0, size); | |
1725 | } else if (s->not_found) { | |
1726 | /* Insert new name. */ | |
1727 | size_t size = EXT4_XATTR_LEN(name_len); | |
1728 | size_t rest = (void *)last - (void *)here + sizeof(__u32); | |
1729 | ||
1730 | memmove((void *)here + size, here, rest); | |
1731 | memset(here, 0, size); | |
1732 | here->e_name_index = i->name_index; | |
1733 | here->e_name_len = name_len; | |
1734 | memcpy(here->e_name, i->name, name_len); | |
1735 | } else { | |
1736 | /* This is an update, reset value info. */ | |
1737 | here->e_value_inum = 0; | |
1738 | here->e_value_offs = 0; | |
1739 | here->e_value_size = 0; | |
1740 | } | |
1741 | ||
ac27a0ec | 1742 | if (i->value) { |
dec214d0 | 1743 | /* Insert new value. */ |
e50e5129 | 1744 | if (in_inode) { |
dec214d0 | 1745 | here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); |
e50e5129 | 1746 | } else if (i->value_len) { |
dec214d0 TE |
1747 | void *val = s->base + min_offs - new_size; |
1748 | ||
1749 | here->e_value_offs = cpu_to_le16(min_offs - new_size); | |
bd9926e8 | 1750 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
dec214d0 | 1751 | memset(val, 0, new_size); |
bd9926e8 | 1752 | } else { |
bd9926e8 | 1753 | memcpy(val, i->value, i->value_len); |
dec214d0 TE |
1754 | /* Clear padding bytes. */ |
1755 | memset(val + i->value_len, 0, | |
1756 | new_size - i->value_len); | |
bd9926e8 | 1757 | } |
ac27a0ec | 1758 | } |
dec214d0 | 1759 | here->e_value_size = cpu_to_le32(i->value_len); |
ac27a0ec | 1760 | } |
daf83281 | 1761 | |
32aaf194 | 1762 | update_hash: |
b9fc761e TE |
1763 | if (i->value) { |
1764 | __le32 hash = 0; | |
1765 | ||
1766 | /* Entry hash calculation. */ | |
1767 | if (in_inode) { | |
1768 | __le32 crc32c_hash; | |
1769 | ||
1770 | /* | |
1771 | * Feed crc32c hash instead of the raw value for entry | |
1772 | * hash calculation. This is to avoid walking | |
1773 | * potentially long value buffer again. | |
1774 | */ | |
1775 | crc32c_hash = cpu_to_le32( | |
1776 | ext4_xattr_inode_get_hash(new_ea_inode)); | |
1777 | hash = ext4_xattr_hash_entry(here->e_name, | |
1778 | here->e_name_len, | |
1779 | &crc32c_hash, 1); | |
1780 | } else if (is_block) { | |
32aaf194 TE |
1781 | __le32 *value = s->base + le16_to_cpu( |
1782 | here->e_value_offs); | |
b9fc761e TE |
1783 | |
1784 | hash = ext4_xattr_hash_entry(here->e_name, | |
1785 | here->e_name_len, value, | |
1786 | new_size >> 2); | |
1787 | } | |
1788 | here->e_hash = hash; | |
daf83281 TE |
1789 | } |
1790 | ||
b9fc761e TE |
1791 | if (is_block) |
1792 | ext4_xattr_rehash((struct ext4_xattr_header *)s->base); | |
1793 | ||
dec214d0 | 1794 | ret = 0; |
e50e5129 | 1795 | out: |
dec214d0 TE |
1796 | iput(old_ea_inode); |
1797 | iput(new_ea_inode); | |
1798 | return ret; | |
ac27a0ec DK |
1799 | } |
1800 | ||
617ba13b MC |
1801 | struct ext4_xattr_block_find { |
1802 | struct ext4_xattr_search s; | |
ac27a0ec DK |
1803 | struct buffer_head *bh; |
1804 | }; | |
1805 | ||
1806 | static int | |
617ba13b MC |
1807 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
1808 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1809 | { |
1810 | struct super_block *sb = inode->i_sb; | |
1811 | int error; | |
1812 | ||
1813 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
1814 | i->name_index, i->name, i->value, (long)i->value_len); | |
1815 | ||
617ba13b | 1816 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 1817 | /* The inode already has an extended attribute block. */ |
617ba13b | 1818 | bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); |
ac27a0ec DK |
1819 | error = -EIO; |
1820 | if (!bs->bh) | |
1821 | goto cleanup; | |
1822 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", | |
1823 | atomic_read(&(bs->bh->b_count)), | |
1824 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
de05ca85 TT |
1825 | error = ext4_xattr_check_block(inode, bs->bh); |
1826 | if (error) | |
ac27a0ec | 1827 | goto cleanup; |
ac27a0ec DK |
1828 | /* Find the named attribute. */ |
1829 | bs->s.base = BHDR(bs->bh); | |
1830 | bs->s.first = BFIRST(bs->bh); | |
1831 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
1832 | bs->s.here = bs->s.first; | |
9496005d TT |
1833 | error = xattr_find_entry(inode, &bs->s.here, bs->s.end, |
1834 | i->name_index, i->name, 1); | |
ac27a0ec DK |
1835 | if (error && error != -ENODATA) |
1836 | goto cleanup; | |
1837 | bs->s.not_found = error; | |
1838 | } | |
1839 | error = 0; | |
1840 | ||
1841 | cleanup: | |
1842 | return error; | |
1843 | } | |
1844 | ||
1845 | static int | |
617ba13b MC |
1846 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
1847 | struct ext4_xattr_info *i, | |
1848 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1849 | { |
1850 | struct super_block *sb = inode->i_sb; | |
1851 | struct buffer_head *new_bh = NULL; | |
b347e2bc TE |
1852 | struct ext4_xattr_search s_copy = bs->s; |
1853 | struct ext4_xattr_search *s = &s_copy; | |
7a2508e1 | 1854 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 1855 | int error = 0; |
47387409 | 1856 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
a6d05676 TE |
1857 | struct inode *ea_inode = NULL, *tmp_inode; |
1858 | size_t old_ea_inode_quota = 0; | |
1859 | unsigned int ea_ino; | |
1860 | ||
ac27a0ec | 1861 | |
617ba13b | 1862 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec | 1863 | |
ac27a0ec | 1864 | if (s->base) { |
5d601255 | 1865 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
1866 | error = ext4_journal_get_write_access(handle, bs->bh); |
1867 | if (error) | |
1868 | goto cleanup; | |
1869 | lock_buffer(bs->bh); | |
1870 | ||
ac27a0ec | 1871 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
1872 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
1873 | ||
1874 | /* | |
1875 | * This must happen under buffer lock for | |
1876 | * ext4_xattr_block_set() to reliably detect modified | |
1877 | * block | |
1878 | */ | |
cdb7ee4c TE |
1879 | if (ea_block_cache) |
1880 | mb_cache_entry_delete(ea_block_cache, hash, | |
1881 | bs->bh->b_blocknr); | |
ac27a0ec | 1882 | ea_bdebug(bs->bh, "modifying in-place"); |
daf83281 TE |
1883 | error = ext4_xattr_set_entry(i, s, handle, inode, |
1884 | true /* is_block */); | |
dac7a4b4 | 1885 | ext4_xattr_block_csum_set(inode, bs->bh); |
ac27a0ec | 1886 | unlock_buffer(bs->bh); |
6a797d27 | 1887 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1888 | goto bad_block; |
1889 | if (!error) | |
dac7a4b4 TT |
1890 | error = ext4_handle_dirty_metadata(handle, |
1891 | inode, | |
1892 | bs->bh); | |
ac27a0ec DK |
1893 | if (error) |
1894 | goto cleanup; | |
1895 | goto inserted; | |
1896 | } else { | |
1897 | int offset = (char *)s->here - bs->bh->b_data; | |
1898 | ||
8a2bfdcb | 1899 | unlock_buffer(bs->bh); |
ac27a0ec | 1900 | ea_bdebug(bs->bh, "cloning"); |
216553c4 | 1901 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
1902 | error = -ENOMEM; |
1903 | if (s->base == NULL) | |
1904 | goto cleanup; | |
1905 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
1906 | s->first = ENTRY(header(s->base)+1); | |
1907 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1908 | s->here = ENTRY(s->base + offset); | |
1909 | s->end = s->base + bs->bh->b_size; | |
dec214d0 TE |
1910 | |
1911 | /* | |
1912 | * If existing entry points to an xattr inode, we need | |
1913 | * to prevent ext4_xattr_set_entry() from decrementing | |
1914 | * ref count on it because the reference belongs to the | |
1915 | * original block. In this case, make the entry look | |
1916 | * like it has an empty value. | |
1917 | */ | |
1918 | if (!s->not_found && s->here->e_value_inum) { | |
a6d05676 TE |
1919 | ea_ino = le32_to_cpu(s->here->e_value_inum); |
1920 | error = ext4_xattr_inode_iget(inode, ea_ino, | |
1921 | le32_to_cpu(s->here->e_hash), | |
1922 | &tmp_inode); | |
1923 | if (error) | |
1924 | goto cleanup; | |
1925 | ||
1926 | if (!ext4_test_inode_state(tmp_inode, | |
1927 | EXT4_STATE_LUSTRE_EA_INODE)) { | |
1928 | /* | |
1929 | * Defer quota free call for previous | |
1930 | * inode until success is guaranteed. | |
1931 | */ | |
1932 | old_ea_inode_quota = le32_to_cpu( | |
dec214d0 | 1933 | s->here->e_value_size); |
a6d05676 TE |
1934 | } |
1935 | iput(tmp_inode); | |
1936 | ||
dec214d0 TE |
1937 | s->here->e_value_inum = 0; |
1938 | s->here->e_value_size = 0; | |
1939 | } | |
ac27a0ec DK |
1940 | } |
1941 | } else { | |
1942 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 1943 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
1944 | /* assert(header == s->base) */ |
1945 | error = -ENOMEM; | |
1946 | if (s->base == NULL) | |
1947 | goto cleanup; | |
617ba13b | 1948 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
1949 | header(s->base)->h_blocks = cpu_to_le32(1); |
1950 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1951 | s->first = ENTRY(header(s->base)+1); | |
1952 | s->here = ENTRY(header(s->base)+1); | |
1953 | s->end = s->base + sb->s_blocksize; | |
1954 | } | |
1955 | ||
daf83281 | 1956 | error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); |
6a797d27 | 1957 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1958 | goto bad_block; |
1959 | if (error) | |
1960 | goto cleanup; | |
dec214d0 TE |
1961 | |
1962 | if (i->value && s->here->e_value_inum) { | |
dec214d0 TE |
1963 | /* |
1964 | * A ref count on ea_inode has been taken as part of the call to | |
1965 | * ext4_xattr_set_entry() above. We would like to drop this | |
1966 | * extra ref but we have to wait until the xattr block is | |
1967 | * initialized and has its own ref count on the ea_inode. | |
1968 | */ | |
1969 | ea_ino = le32_to_cpu(s->here->e_value_inum); | |
a6d05676 TE |
1970 | error = ext4_xattr_inode_iget(inode, ea_ino, |
1971 | le32_to_cpu(s->here->e_hash), | |
1972 | &ea_inode); | |
dec214d0 TE |
1973 | if (error) { |
1974 | ea_inode = NULL; | |
1975 | goto cleanup; | |
1976 | } | |
1977 | } | |
1978 | ||
ac27a0ec DK |
1979 | inserted: |
1980 | if (!IS_LAST_ENTRY(s->first)) { | |
47387409 TE |
1981 | new_bh = ext4_xattr_block_cache_find(inode, header(s->base), |
1982 | &ce); | |
ac27a0ec DK |
1983 | if (new_bh) { |
1984 | /* We found an identical block in the cache. */ | |
1985 | if (new_bh == bs->bh) | |
1986 | ea_bdebug(new_bh, "keeping"); | |
1987 | else { | |
6048c64b AG |
1988 | u32 ref; |
1989 | ||
b8cb5a54 TE |
1990 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
1991 | ||
ac27a0ec DK |
1992 | /* The old block is released after updating |
1993 | the inode. */ | |
1231b3a1 LC |
1994 | error = dquot_alloc_block(inode, |
1995 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 1996 | if (error) |
ac27a0ec | 1997 | goto cleanup; |
5d601255 | 1998 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 1999 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
2000 | new_bh); |
2001 | if (error) | |
2002 | goto cleanup_dquot; | |
2003 | lock_buffer(new_bh); | |
82939d79 JK |
2004 | /* |
2005 | * We have to be careful about races with | |
6048c64b AG |
2006 | * freeing, rehashing or adding references to |
2007 | * xattr block. Once we hold buffer lock xattr | |
2008 | * block's state is stable so we can check | |
2009 | * whether the block got freed / rehashed or | |
2010 | * not. Since we unhash mbcache entry under | |
2011 | * buffer lock when freeing / rehashing xattr | |
2012 | * block, checking whether entry is still | |
2013 | * hashed is reliable. Same rules hold for | |
2014 | * e_reusable handling. | |
82939d79 | 2015 | */ |
6048c64b AG |
2016 | if (hlist_bl_unhashed(&ce->e_hash_list) || |
2017 | !ce->e_reusable) { | |
82939d79 JK |
2018 | /* |
2019 | * Undo everything and check mbcache | |
2020 | * again. | |
2021 | */ | |
2022 | unlock_buffer(new_bh); | |
2023 | dquot_free_block(inode, | |
2024 | EXT4_C2B(EXT4_SB(sb), | |
2025 | 1)); | |
2026 | brelse(new_bh); | |
47387409 | 2027 | mb_cache_entry_put(ea_block_cache, ce); |
82939d79 JK |
2028 | ce = NULL; |
2029 | new_bh = NULL; | |
2030 | goto inserted; | |
2031 | } | |
6048c64b AG |
2032 | ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
2033 | BHDR(new_bh)->h_refcount = cpu_to_le32(ref); | |
2034 | if (ref >= EXT4_XATTR_REFCOUNT_MAX) | |
2035 | ce->e_reusable = 0; | |
ac27a0ec | 2036 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
6048c64b | 2037 | ref); |
dac7a4b4 | 2038 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec | 2039 | unlock_buffer(new_bh); |
dac7a4b4 TT |
2040 | error = ext4_handle_dirty_metadata(handle, |
2041 | inode, | |
2042 | new_bh); | |
ac27a0ec DK |
2043 | if (error) |
2044 | goto cleanup_dquot; | |
2045 | } | |
47387409 TE |
2046 | mb_cache_entry_touch(ea_block_cache, ce); |
2047 | mb_cache_entry_put(ea_block_cache, ce); | |
ac27a0ec DK |
2048 | ce = NULL; |
2049 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
2050 | /* We were modifying this block in-place. */ | |
2051 | ea_bdebug(bs->bh, "keeping this block"); | |
ec000220 | 2052 | ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); |
ac27a0ec DK |
2053 | new_bh = bs->bh; |
2054 | get_bh(new_bh); | |
2055 | } else { | |
2056 | /* We need to allocate a new block */ | |
fb0a387d ES |
2057 | ext4_fsblk_t goal, block; |
2058 | ||
b8cb5a54 TE |
2059 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
2060 | ||
fb0a387d | 2061 | goal = ext4_group_first_block_no(sb, |
d00a6d7b | 2062 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
2063 | |
2064 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 2065 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2066 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
2067 | ||
55f020db AH |
2068 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
2069 | NULL, &error); | |
ac27a0ec DK |
2070 | if (error) |
2071 | goto cleanup; | |
fb0a387d | 2072 | |
12e9b892 | 2073 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2074 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
2075 | ||
ace36ad4 JP |
2076 | ea_idebug(inode, "creating block %llu", |
2077 | (unsigned long long)block); | |
ac27a0ec DK |
2078 | |
2079 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 2080 | if (unlikely(!new_bh)) { |
860d21e2 | 2081 | error = -ENOMEM; |
ac27a0ec | 2082 | getblk_failed: |
7dc57615 | 2083 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 2084 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
2085 | goto cleanup; |
2086 | } | |
dec214d0 TE |
2087 | error = ext4_xattr_inode_inc_ref_all(handle, inode, |
2088 | ENTRY(header(s->base)+1)); | |
2089 | if (error) | |
2090 | goto getblk_failed; | |
2091 | if (ea_inode) { | |
2092 | /* Drop the extra ref on ea_inode. */ | |
2093 | error = ext4_xattr_inode_dec_ref(handle, | |
2094 | ea_inode); | |
2095 | if (error) | |
2096 | ext4_warning_inode(ea_inode, | |
2097 | "dec ref error=%d", | |
2098 | error); | |
2099 | iput(ea_inode); | |
2100 | ea_inode = NULL; | |
2101 | } | |
2102 | ||
ac27a0ec | 2103 | lock_buffer(new_bh); |
617ba13b | 2104 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
2105 | if (error) { |
2106 | unlock_buffer(new_bh); | |
860d21e2 | 2107 | error = -EIO; |
ac27a0ec DK |
2108 | goto getblk_failed; |
2109 | } | |
2110 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
dac7a4b4 | 2111 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec DK |
2112 | set_buffer_uptodate(new_bh); |
2113 | unlock_buffer(new_bh); | |
47387409 | 2114 | ext4_xattr_block_cache_insert(ea_block_cache, new_bh); |
dac7a4b4 TT |
2115 | error = ext4_handle_dirty_metadata(handle, inode, |
2116 | new_bh); | |
ac27a0ec DK |
2117 | if (error) |
2118 | goto cleanup; | |
2119 | } | |
2120 | } | |
2121 | ||
a6d05676 TE |
2122 | if (old_ea_inode_quota) |
2123 | ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); | |
dec214d0 | 2124 | |
ac27a0ec | 2125 | /* Update the inode. */ |
617ba13b | 2126 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
2127 | |
2128 | /* Drop the previous xattr block. */ | |
dec214d0 TE |
2129 | if (bs->bh && bs->bh != new_bh) { |
2130 | struct ext4_xattr_inode_array *ea_inode_array = NULL; | |
2131 | ||
2132 | ext4_xattr_release_block(handle, inode, bs->bh, | |
2133 | &ea_inode_array, | |
2134 | 0 /* extra_credits */); | |
2135 | ext4_xattr_inode_array_free(ea_inode_array); | |
2136 | } | |
ac27a0ec DK |
2137 | error = 0; |
2138 | ||
2139 | cleanup: | |
dec214d0 TE |
2140 | if (ea_inode) { |
2141 | int error2; | |
2142 | ||
2143 | error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
2144 | if (error2) | |
2145 | ext4_warning_inode(ea_inode, "dec ref error=%d", | |
2146 | error2); | |
2147 | ||
2148 | /* If there was an error, revert the quota charge. */ | |
2149 | if (error) | |
a6d05676 | 2150 | ext4_xattr_inode_free_quota(inode, ea_inode, |
dec214d0 TE |
2151 | i_size_read(ea_inode)); |
2152 | iput(ea_inode); | |
2153 | } | |
ac27a0ec | 2154 | if (ce) |
47387409 | 2155 | mb_cache_entry_put(ea_block_cache, ce); |
ac27a0ec DK |
2156 | brelse(new_bh); |
2157 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
2158 | kfree(s->base); | |
2159 | ||
2160 | return error; | |
2161 | ||
2162 | cleanup_dquot: | |
1231b3a1 | 2163 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
2164 | goto cleanup; |
2165 | ||
2166 | bad_block: | |
24676da4 TT |
2167 | EXT4_ERROR_INODE(inode, "bad block %llu", |
2168 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
2169 | goto cleanup; |
2170 | ||
2171 | #undef header | |
2172 | } | |
2173 | ||
879b3825 TM |
2174 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
2175 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2176 | { |
617ba13b MC |
2177 | struct ext4_xattr_ibody_header *header; |
2178 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
2179 | int error; |
2180 | ||
617ba13b | 2181 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 2182 | return 0; |
617ba13b | 2183 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
2184 | header = IHDR(inode, raw_inode); |
2185 | is->s.base = is->s.first = IFIRST(header); | |
2186 | is->s.here = is->s.first; | |
617ba13b | 2187 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 2188 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
9e92f48c | 2189 | error = xattr_check_inode(inode, header, is->s.end); |
ac27a0ec DK |
2190 | if (error) |
2191 | return error; | |
2192 | /* Find the named attribute. */ | |
9496005d TT |
2193 | error = xattr_find_entry(inode, &is->s.here, is->s.end, |
2194 | i->name_index, i->name, 0); | |
ac27a0ec DK |
2195 | if (error && error != -ENODATA) |
2196 | return error; | |
2197 | is->s.not_found = error; | |
2198 | } | |
2199 | return 0; | |
2200 | } | |
2201 | ||
0d812f77 TM |
2202 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
2203 | struct ext4_xattr_info *i, | |
2204 | struct ext4_xattr_ibody_find *is) | |
2205 | { | |
2206 | struct ext4_xattr_ibody_header *header; | |
2207 | struct ext4_xattr_search *s = &is->s; | |
2208 | int error; | |
2209 | ||
2210 | if (EXT4_I(inode)->i_extra_isize == 0) | |
2211 | return -ENOSPC; | |
daf83281 | 2212 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
8bc1379b TT |
2213 | if (error) |
2214 | return error; | |
0d812f77 TM |
2215 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
2216 | if (!IS_LAST_ENTRY(s->first)) { | |
2217 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
2218 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
2219 | } else { | |
2220 | header->h_magic = cpu_to_le32(0); | |
2221 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
2222 | } | |
2223 | return 0; | |
2224 | } | |
2225 | ||
e50e5129 | 2226 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, |
0d812f77 TM |
2227 | struct ext4_xattr_info *i, |
2228 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2229 | { |
617ba13b MC |
2230 | struct ext4_xattr_ibody_header *header; |
2231 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
2232 | int error; |
2233 | ||
617ba13b | 2234 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 2235 | return -ENOSPC; |
daf83281 | 2236 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
ac27a0ec DK |
2237 | if (error) |
2238 | return error; | |
617ba13b | 2239 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 2240 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 2241 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 2242 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2243 | } else { |
2244 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 2245 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2246 | } |
2247 | return 0; | |
2248 | } | |
2249 | ||
3fd16462 JK |
2250 | static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
2251 | struct ext4_xattr_info *i) | |
2252 | { | |
2253 | void *value; | |
2254 | ||
0bd454c0 TE |
2255 | /* When e_value_inum is set the value is stored externally. */ |
2256 | if (s->here->e_value_inum) | |
2257 | return 0; | |
3fd16462 JK |
2258 | if (le32_to_cpu(s->here->e_value_size) != i->value_len) |
2259 | return 0; | |
2260 | value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); | |
2261 | return !memcmp(value, i->value, i->value_len); | |
2262 | } | |
2263 | ||
dec214d0 TE |
2264 | static struct buffer_head *ext4_xattr_get_block(struct inode *inode) |
2265 | { | |
2266 | struct buffer_head *bh; | |
2267 | int error; | |
2268 | ||
2269 | if (!EXT4_I(inode)->i_file_acl) | |
2270 | return NULL; | |
2271 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
2272 | if (!bh) | |
2273 | return ERR_PTR(-EIO); | |
2274 | error = ext4_xattr_check_block(inode, bh); | |
ecaaf408 VA |
2275 | if (error) { |
2276 | brelse(bh); | |
dec214d0 | 2277 | return ERR_PTR(error); |
ecaaf408 | 2278 | } |
dec214d0 TE |
2279 | return bh; |
2280 | } | |
2281 | ||
ac27a0ec | 2282 | /* |
617ba13b | 2283 | * ext4_xattr_set_handle() |
ac27a0ec | 2284 | * |
6e9510b0 | 2285 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
2286 | * is NULL to remove an existing extended attribute, and non-NULL to |
2287 | * either replace an existing extended attribute, or create a new extended | |
2288 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
2289 | * specify that an extended attribute must exist and must not exist | |
2290 | * previous to the call, respectively. | |
2291 | * | |
2292 | * Returns 0, or a negative error number on failure. | |
2293 | */ | |
2294 | int | |
617ba13b | 2295 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
2296 | const char *name, const void *value, size_t value_len, |
2297 | int flags) | |
2298 | { | |
617ba13b | 2299 | struct ext4_xattr_info i = { |
ac27a0ec DK |
2300 | .name_index = name_index, |
2301 | .name = name, | |
2302 | .value = value, | |
2303 | .value_len = value_len, | |
e50e5129 | 2304 | .in_inode = 0, |
ac27a0ec | 2305 | }; |
617ba13b | 2306 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
2307 | .s = { .not_found = -ENODATA, }, |
2308 | }; | |
617ba13b | 2309 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
2310 | .s = { .not_found = -ENODATA, }, |
2311 | }; | |
c755e251 | 2312 | int no_expand; |
ac27a0ec DK |
2313 | int error; |
2314 | ||
2315 | if (!name) | |
2316 | return -EINVAL; | |
2317 | if (strlen(name) > 255) | |
2318 | return -ERANGE; | |
b8cb5a54 | 2319 | |
c755e251 | 2320 | ext4_write_lock_xattr(inode, &no_expand); |
4d20c685 | 2321 | |
c1a5d5f6 TE |
2322 | /* Check journal credits under write lock. */ |
2323 | if (ext4_handle_valid(handle)) { | |
dec214d0 | 2324 | struct buffer_head *bh; |
c1a5d5f6 TE |
2325 | int credits; |
2326 | ||
dec214d0 TE |
2327 | bh = ext4_xattr_get_block(inode); |
2328 | if (IS_ERR(bh)) { | |
2329 | error = PTR_ERR(bh); | |
2330 | goto cleanup; | |
2331 | } | |
2332 | ||
af65207c TE |
2333 | credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2334 | value_len, | |
2335 | flags & XATTR_CREATE); | |
dec214d0 TE |
2336 | brelse(bh); |
2337 | ||
c1a5d5f6 TE |
2338 | if (!ext4_handle_has_enough_credits(handle, credits)) { |
2339 | error = -ENOSPC; | |
2340 | goto cleanup; | |
2341 | } | |
2342 | } | |
2343 | ||
66543617 | 2344 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
2345 | if (error) |
2346 | goto cleanup; | |
2347 | ||
19f5fb7a | 2348 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
2349 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
2350 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 2351 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
2352 | } |
2353 | ||
617ba13b | 2354 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
2355 | if (error) |
2356 | goto cleanup; | |
2357 | if (is.s.not_found) | |
617ba13b | 2358 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
2359 | if (error) |
2360 | goto cleanup; | |
2361 | if (is.s.not_found && bs.s.not_found) { | |
2362 | error = -ENODATA; | |
2363 | if (flags & XATTR_REPLACE) | |
2364 | goto cleanup; | |
2365 | error = 0; | |
2366 | if (!value) | |
2367 | goto cleanup; | |
2368 | } else { | |
2369 | error = -EEXIST; | |
2370 | if (flags & XATTR_CREATE) | |
2371 | goto cleanup; | |
2372 | } | |
dec214d0 | 2373 | |
ac27a0ec DK |
2374 | if (!value) { |
2375 | if (!is.s.not_found) | |
e50e5129 | 2376 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 2377 | else if (!bs.s.not_found) |
617ba13b | 2378 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2379 | } else { |
3fd16462 JK |
2380 | error = 0; |
2381 | /* Xattr value did not change? Save us some work and bail out */ | |
2382 | if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) | |
2383 | goto cleanup; | |
2384 | if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) | |
2385 | goto cleanup; | |
2386 | ||
b347e2bc TE |
2387 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2388 | (EXT4_XATTR_SIZE(i.value_len) > | |
2389 | EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) | |
2390 | i.in_inode = 1; | |
2391 | retry_inode: | |
e50e5129 | 2392 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
2393 | if (!error && !bs.s.not_found) { |
2394 | i.value = NULL; | |
617ba13b | 2395 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2396 | } else if (error == -ENOSPC) { |
7e01c8e5 TY |
2397 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
2398 | error = ext4_xattr_block_find(inode, &i, &bs); | |
2399 | if (error) | |
2400 | goto cleanup; | |
2401 | } | |
617ba13b | 2402 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
b347e2bc | 2403 | if (!error && !is.s.not_found) { |
ac27a0ec | 2404 | i.value = NULL; |
e50e5129 AD |
2405 | error = ext4_xattr_ibody_set(handle, inode, &i, |
2406 | &is); | |
b347e2bc TE |
2407 | } else if (error == -ENOSPC) { |
2408 | /* | |
2409 | * Xattr does not fit in the block, store at | |
2410 | * external inode if possible. | |
2411 | */ | |
2412 | if (ext4_has_feature_ea_inode(inode->i_sb) && | |
2413 | !i.in_inode) { | |
2414 | i.in_inode = 1; | |
2415 | goto retry_inode; | |
2416 | } | |
ac27a0ec DK |
2417 | } |
2418 | } | |
2419 | } | |
2420 | if (!error) { | |
617ba13b | 2421 | ext4_xattr_update_super_block(handle, inode->i_sb); |
eeca7ea1 | 2422 | inode->i_ctime = current_time(inode); |
6dd4ee7c | 2423 | if (!value) |
c755e251 | 2424 | no_expand = 0; |
617ba13b | 2425 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 2426 | /* |
617ba13b | 2427 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
2428 | * error != 0. |
2429 | */ | |
2430 | is.iloc.bh = NULL; | |
2431 | if (IS_SYNC(inode)) | |
0390131b | 2432 | ext4_handle_sync(handle); |
ac27a0ec DK |
2433 | } |
2434 | ||
2435 | cleanup: | |
2436 | brelse(is.iloc.bh); | |
2437 | brelse(bs.bh); | |
c755e251 | 2438 | ext4_write_unlock_xattr(inode, &no_expand); |
ac27a0ec DK |
2439 | return error; |
2440 | } | |
2441 | ||
af65207c TE |
2442 | int ext4_xattr_set_credits(struct inode *inode, size_t value_len, |
2443 | bool is_create, int *credits) | |
c1a5d5f6 | 2444 | { |
dec214d0 TE |
2445 | struct buffer_head *bh; |
2446 | int err; | |
c1a5d5f6 | 2447 | |
dec214d0 | 2448 | *credits = 0; |
c1a5d5f6 | 2449 | |
dec214d0 TE |
2450 | if (!EXT4_SB(inode->i_sb)->s_journal) |
2451 | return 0; | |
c1a5d5f6 | 2452 | |
dec214d0 | 2453 | down_read(&EXT4_I(inode)->xattr_sem); |
c1a5d5f6 | 2454 | |
dec214d0 TE |
2455 | bh = ext4_xattr_get_block(inode); |
2456 | if (IS_ERR(bh)) { | |
2457 | err = PTR_ERR(bh); | |
2458 | } else { | |
af65207c TE |
2459 | *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2460 | value_len, is_create); | |
dec214d0 TE |
2461 | brelse(bh); |
2462 | err = 0; | |
c1a5d5f6 | 2463 | } |
dec214d0 TE |
2464 | |
2465 | up_read(&EXT4_I(inode)->xattr_sem); | |
2466 | return err; | |
c1a5d5f6 TE |
2467 | } |
2468 | ||
ac27a0ec | 2469 | /* |
617ba13b | 2470 | * ext4_xattr_set() |
ac27a0ec | 2471 | * |
617ba13b | 2472 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
2473 | * attribute modification is a filesystem transaction by itself. |
2474 | * | |
2475 | * Returns 0, or a negative error number on failure. | |
2476 | */ | |
2477 | int | |
617ba13b | 2478 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
2479 | const void *value, size_t value_len, int flags) |
2480 | { | |
2481 | handle_t *handle; | |
e50e5129 | 2482 | struct super_block *sb = inode->i_sb; |
ac27a0ec | 2483 | int error, retries = 0; |
c1a5d5f6 | 2484 | int credits; |
ac27a0ec | 2485 | |
b8cb5a54 TE |
2486 | error = dquot_initialize(inode); |
2487 | if (error) | |
2488 | return error; | |
e50e5129 | 2489 | |
ac27a0ec | 2490 | retry: |
af65207c TE |
2491 | error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, |
2492 | &credits); | |
dec214d0 TE |
2493 | if (error) |
2494 | return error; | |
2495 | ||
9924a92a | 2496 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
2497 | if (IS_ERR(handle)) { |
2498 | error = PTR_ERR(handle); | |
2499 | } else { | |
2500 | int error2; | |
2501 | ||
617ba13b | 2502 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 2503 | value, value_len, flags); |
617ba13b | 2504 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 2505 | if (error == -ENOSPC && |
e50e5129 | 2506 | ext4_should_retry_alloc(sb, &retries)) |
ac27a0ec DK |
2507 | goto retry; |
2508 | if (error == 0) | |
2509 | error = error2; | |
2510 | } | |
2511 | ||
2512 | return error; | |
2513 | } | |
2514 | ||
6dd4ee7c KS |
2515 | /* |
2516 | * Shift the EA entries in the inode to create space for the increased | |
2517 | * i_extra_isize. | |
2518 | */ | |
2519 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
2520 | int value_offs_shift, void *to, | |
94405713 | 2521 | void *from, size_t n) |
6dd4ee7c KS |
2522 | { |
2523 | struct ext4_xattr_entry *last = entry; | |
2524 | int new_offs; | |
2525 | ||
94405713 JK |
2526 | /* We always shift xattr headers further thus offsets get lower */ |
2527 | BUG_ON(value_offs_shift > 0); | |
2528 | ||
6dd4ee7c KS |
2529 | /* Adjust the value offsets of the entries */ |
2530 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 2531 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
2532 | new_offs = le16_to_cpu(last->e_value_offs) + |
2533 | value_offs_shift; | |
6dd4ee7c KS |
2534 | last->e_value_offs = cpu_to_le16(new_offs); |
2535 | } | |
2536 | } | |
2537 | /* Shift the entries by n bytes */ | |
2538 | memmove(to, from, n); | |
2539 | } | |
2540 | ||
3f2571c1 JK |
2541 | /* |
2542 | * Move xattr pointed to by 'entry' from inode into external xattr block | |
2543 | */ | |
2544 | static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, | |
2545 | struct ext4_inode *raw_inode, | |
2546 | struct ext4_xattr_entry *entry) | |
2547 | { | |
2548 | struct ext4_xattr_ibody_find *is = NULL; | |
2549 | struct ext4_xattr_block_find *bs = NULL; | |
2550 | char *buffer = NULL, *b_entry_name = NULL; | |
f6109100 | 2551 | size_t value_size = le32_to_cpu(entry->e_value_size); |
3f2571c1 JK |
2552 | struct ext4_xattr_info i = { |
2553 | .value = NULL, | |
2554 | .value_len = 0, | |
2555 | .name_index = entry->e_name_index, | |
f6109100 | 2556 | .in_inode = !!entry->e_value_inum, |
3f2571c1 JK |
2557 | }; |
2558 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2559 | int error; | |
2560 | ||
3f2571c1 JK |
2561 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); |
2562 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
2563 | buffer = kmalloc(value_size, GFP_NOFS); | |
2564 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
2565 | if (!is || !bs || !buffer || !b_entry_name) { | |
2566 | error = -ENOMEM; | |
2567 | goto out; | |
2568 | } | |
2569 | ||
2570 | is->s.not_found = -ENODATA; | |
2571 | bs->s.not_found = -ENODATA; | |
2572 | is->iloc.bh = NULL; | |
2573 | bs->bh = NULL; | |
2574 | ||
2575 | /* Save the entry name and the entry value */ | |
f6109100 | 2576 | if (entry->e_value_inum) { |
b9fc761e | 2577 | error = ext4_xattr_inode_get(inode, entry, buffer, value_size); |
f6109100 TE |
2578 | if (error) |
2579 | goto out; | |
2580 | } else { | |
2581 | size_t value_offs = le16_to_cpu(entry->e_value_offs); | |
2582 | memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); | |
2583 | } | |
2584 | ||
3f2571c1 JK |
2585 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); |
2586 | b_entry_name[entry->e_name_len] = '\0'; | |
2587 | i.name = b_entry_name; | |
2588 | ||
2589 | error = ext4_get_inode_loc(inode, &is->iloc); | |
2590 | if (error) | |
2591 | goto out; | |
2592 | ||
2593 | error = ext4_xattr_ibody_find(inode, &i, is); | |
2594 | if (error) | |
2595 | goto out; | |
2596 | ||
2597 | /* Remove the chosen entry from the inode */ | |
e50e5129 | 2598 | error = ext4_xattr_ibody_set(handle, inode, &i, is); |
3f2571c1 JK |
2599 | if (error) |
2600 | goto out; | |
2601 | ||
3f2571c1 JK |
2602 | i.value = buffer; |
2603 | i.value_len = value_size; | |
2604 | error = ext4_xattr_block_find(inode, &i, bs); | |
2605 | if (error) | |
2606 | goto out; | |
2607 | ||
2608 | /* Add entry which was removed from the inode into the block */ | |
2609 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
2610 | if (error) | |
2611 | goto out; | |
2612 | error = 0; | |
2613 | out: | |
2614 | kfree(b_entry_name); | |
2615 | kfree(buffer); | |
2616 | if (is) | |
2617 | brelse(is->iloc.bh); | |
2618 | kfree(is); | |
2619 | kfree(bs); | |
2620 | ||
2621 | return error; | |
2622 | } | |
2623 | ||
dfa2064b JK |
2624 | static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, |
2625 | struct ext4_inode *raw_inode, | |
2626 | int isize_diff, size_t ifree, | |
2627 | size_t bfree, int *total_ino) | |
2628 | { | |
2629 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2630 | struct ext4_xattr_entry *small_entry; | |
2631 | struct ext4_xattr_entry *entry; | |
2632 | struct ext4_xattr_entry *last; | |
2633 | unsigned int entry_size; /* EA entry size */ | |
2634 | unsigned int total_size; /* EA entry size + value size */ | |
2635 | unsigned int min_total_size; | |
2636 | int error; | |
2637 | ||
2638 | while (isize_diff > ifree) { | |
2639 | entry = NULL; | |
2640 | small_entry = NULL; | |
2641 | min_total_size = ~0U; | |
2642 | last = IFIRST(header); | |
2643 | /* Find the entry best suited to be pushed into EA block */ | |
2644 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
8cdb5240 TT |
2645 | /* never move system.data out of the inode */ |
2646 | if ((last->e_name_len == 4) && | |
2647 | (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) && | |
2648 | !memcmp(last->e_name, "data", 4)) | |
2649 | continue; | |
9bb21ced TE |
2650 | total_size = EXT4_XATTR_LEN(last->e_name_len); |
2651 | if (!last->e_value_inum) | |
2652 | total_size += EXT4_XATTR_SIZE( | |
2653 | le32_to_cpu(last->e_value_size)); | |
dfa2064b JK |
2654 | if (total_size <= bfree && |
2655 | total_size < min_total_size) { | |
2656 | if (total_size + ifree < isize_diff) { | |
2657 | small_entry = last; | |
2658 | } else { | |
2659 | entry = last; | |
2660 | min_total_size = total_size; | |
2661 | } | |
2662 | } | |
2663 | } | |
2664 | ||
2665 | if (entry == NULL) { | |
2666 | if (small_entry == NULL) | |
2667 | return -ENOSPC; | |
2668 | entry = small_entry; | |
2669 | } | |
2670 | ||
2671 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
9bb21ced TE |
2672 | total_size = entry_size; |
2673 | if (!entry->e_value_inum) | |
2674 | total_size += EXT4_XATTR_SIZE( | |
2675 | le32_to_cpu(entry->e_value_size)); | |
dfa2064b JK |
2676 | error = ext4_xattr_move_to_block(handle, inode, raw_inode, |
2677 | entry); | |
2678 | if (error) | |
2679 | return error; | |
2680 | ||
2681 | *total_ino -= entry_size; | |
2682 | ifree += total_size; | |
2683 | bfree -= total_size; | |
2684 | } | |
2685 | ||
2686 | return 0; | |
2687 | } | |
2688 | ||
6dd4ee7c KS |
2689 | /* |
2690 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
2691 | * Returns 0 on success or negative error number on failure. | |
2692 | */ | |
2693 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
2694 | struct ext4_inode *raw_inode, handle_t *handle) | |
2695 | { | |
2696 | struct ext4_xattr_ibody_header *header; | |
b640b2c5 | 2697 | struct buffer_head *bh; |
cf0a5e81 MX |
2698 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
2699 | static unsigned int mnt_count; | |
e3014d14 JK |
2700 | size_t min_offs; |
2701 | size_t ifree, bfree; | |
7b1b2c1b | 2702 | int total_ino; |
6e0cd088 | 2703 | void *base, *end; |
d0141191 | 2704 | int error = 0, tried_min_extra_isize = 0; |
cf0a5e81 | 2705 | int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); |
d0141191 | 2706 | int isize_diff; /* How much do we need to grow i_extra_isize */ |
6dd4ee7c | 2707 | |
6dd4ee7c | 2708 | retry: |
d0141191 | 2709 | isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; |
2e81a4ee | 2710 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) |
b640b2c5 | 2711 | return 0; |
6dd4ee7c KS |
2712 | |
2713 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
2714 | |
2715 | /* | |
2716 | * Check if enough free space is available in the inode to shift the | |
2717 | * entries ahead by new_extra_isize. | |
2718 | */ | |
2719 | ||
6e0cd088 | 2720 | base = IFIRST(header); |
6dd4ee7c KS |
2721 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
2722 | min_offs = end - base; | |
6dd4ee7c KS |
2723 | total_ino = sizeof(struct ext4_xattr_ibody_header); |
2724 | ||
9e92f48c TT |
2725 | error = xattr_check_inode(inode, header, end); |
2726 | if (error) | |
2727 | goto cleanup; | |
2728 | ||
6e0cd088 | 2729 | ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); |
e3014d14 JK |
2730 | if (ifree >= isize_diff) |
2731 | goto shift; | |
6dd4ee7c KS |
2732 | |
2733 | /* | |
2734 | * Enough free space isn't available in the inode, check if | |
2735 | * EA block can hold new_extra_isize bytes. | |
2736 | */ | |
2737 | if (EXT4_I(inode)->i_file_acl) { | |
2738 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
2739 | error = -EIO; | |
2740 | if (!bh) | |
2741 | goto cleanup; | |
de05ca85 TT |
2742 | error = ext4_xattr_check_block(inode, bh); |
2743 | if (error) | |
6dd4ee7c | 2744 | goto cleanup; |
6dd4ee7c | 2745 | base = BHDR(bh); |
6dd4ee7c KS |
2746 | end = bh->b_data + bh->b_size; |
2747 | min_offs = end - base; | |
6e0cd088 JK |
2748 | bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, |
2749 | NULL); | |
b640b2c5 | 2750 | brelse(bh); |
e3014d14 | 2751 | if (bfree + ifree < isize_diff) { |
6dd4ee7c KS |
2752 | if (!tried_min_extra_isize && s_min_extra_isize) { |
2753 | tried_min_extra_isize++; | |
2754 | new_extra_isize = s_min_extra_isize; | |
6dd4ee7c KS |
2755 | goto retry; |
2756 | } | |
dfa2064b | 2757 | error = -ENOSPC; |
6dd4ee7c KS |
2758 | goto cleanup; |
2759 | } | |
2760 | } else { | |
e3014d14 | 2761 | bfree = inode->i_sb->s_blocksize; |
6dd4ee7c KS |
2762 | } |
2763 | ||
dfa2064b JK |
2764 | error = ext4_xattr_make_inode_space(handle, inode, raw_inode, |
2765 | isize_diff, ifree, bfree, | |
2766 | &total_ino); | |
2767 | if (error) { | |
2768 | if (error == -ENOSPC && !tried_min_extra_isize && | |
2769 | s_min_extra_isize) { | |
2770 | tried_min_extra_isize++; | |
2771 | new_extra_isize = s_min_extra_isize; | |
dfa2064b | 2772 | goto retry; |
6dd4ee7c | 2773 | } |
dfa2064b | 2774 | goto cleanup; |
6dd4ee7c | 2775 | } |
e3014d14 JK |
2776 | shift: |
2777 | /* Adjust the offsets and shift the remaining entries ahead */ | |
6e0cd088 | 2778 | ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize |
e3014d14 JK |
2779 | - new_extra_isize, (void *)raw_inode + |
2780 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
94405713 | 2781 | (void *)header, total_ino); |
e3014d14 | 2782 | EXT4_I(inode)->i_extra_isize = new_extra_isize; |
6dd4ee7c KS |
2783 | |
2784 | cleanup: | |
b640b2c5 | 2785 | if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { |
cf0a5e81 MX |
2786 | ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", |
2787 | inode->i_ino); | |
2788 | mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); | |
2789 | } | |
6dd4ee7c KS |
2790 | return error; |
2791 | } | |
2792 | ||
e50e5129 AD |
2793 | #define EIA_INCR 16 /* must be 2^n */ |
2794 | #define EIA_MASK (EIA_INCR - 1) | |
dec214d0 TE |
2795 | |
2796 | /* Add the large xattr @inode into @ea_inode_array for deferred iput(). | |
0421a189 | 2797 | * If @ea_inode_array is new or full it will be grown and the old |
e50e5129 AD |
2798 | * contents copied over. |
2799 | */ | |
2800 | static int | |
0421a189 TE |
2801 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, |
2802 | struct inode *inode) | |
e50e5129 | 2803 | { |
0421a189 | 2804 | if (*ea_inode_array == NULL) { |
e50e5129 AD |
2805 | /* |
2806 | * Start with 15 inodes, so it fits into a power-of-two size. | |
0421a189 | 2807 | * If *ea_inode_array is NULL, this is essentially offsetof() |
e50e5129 | 2808 | */ |
0421a189 TE |
2809 | (*ea_inode_array) = |
2810 | kmalloc(offsetof(struct ext4_xattr_inode_array, | |
2811 | inodes[EIA_MASK]), | |
e50e5129 | 2812 | GFP_NOFS); |
0421a189 | 2813 | if (*ea_inode_array == NULL) |
e50e5129 | 2814 | return -ENOMEM; |
0421a189 TE |
2815 | (*ea_inode_array)->count = 0; |
2816 | } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { | |
e50e5129 | 2817 | /* expand the array once all 15 + n * 16 slots are full */ |
0421a189 TE |
2818 | struct ext4_xattr_inode_array *new_array = NULL; |
2819 | int count = (*ea_inode_array)->count; | |
e50e5129 AD |
2820 | |
2821 | /* if new_array is NULL, this is essentially offsetof() */ | |
2822 | new_array = kmalloc( | |
0421a189 TE |
2823 | offsetof(struct ext4_xattr_inode_array, |
2824 | inodes[count + EIA_INCR]), | |
e50e5129 AD |
2825 | GFP_NOFS); |
2826 | if (new_array == NULL) | |
2827 | return -ENOMEM; | |
0421a189 TE |
2828 | memcpy(new_array, *ea_inode_array, |
2829 | offsetof(struct ext4_xattr_inode_array, inodes[count])); | |
2830 | kfree(*ea_inode_array); | |
2831 | *ea_inode_array = new_array; | |
e50e5129 | 2832 | } |
0421a189 | 2833 | (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; |
e50e5129 AD |
2834 | return 0; |
2835 | } | |
2836 | ||
ac27a0ec | 2837 | /* |
617ba13b | 2838 | * ext4_xattr_delete_inode() |
ac27a0ec | 2839 | * |
e50e5129 | 2840 | * Free extended attribute resources associated with this inode. Traverse |
dec214d0 TE |
2841 | * all entries and decrement reference on any xattr inodes associated with this |
2842 | * inode. This is called immediately before an inode is freed. We have exclusive | |
2843 | * access to the inode. If an orphan inode is deleted it will also release its | |
2844 | * references on xattr block and xattr inodes. | |
ac27a0ec | 2845 | */ |
dec214d0 TE |
2846 | int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, |
2847 | struct ext4_xattr_inode_array **ea_inode_array, | |
2848 | int extra_credits) | |
ac27a0ec DK |
2849 | { |
2850 | struct buffer_head *bh = NULL; | |
e50e5129 | 2851 | struct ext4_xattr_ibody_header *header; |
30a7eb97 | 2852 | struct ext4_iloc iloc = { .bh = NULL }; |
dec214d0 | 2853 | struct ext4_xattr_entry *entry; |
a6d05676 | 2854 | struct inode *ea_inode; |
30a7eb97 TE |
2855 | int error; |
2856 | ||
2857 | error = ext4_xattr_ensure_credits(handle, inode, extra_credits, | |
2858 | NULL /* bh */, | |
2859 | false /* dirty */, | |
2860 | false /* block_csum */); | |
2861 | if (error) { | |
2862 | EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); | |
2863 | goto cleanup; | |
2864 | } | |
ac27a0ec | 2865 | |
dec214d0 TE |
2866 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2867 | ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
e50e5129 | 2868 | |
dec214d0 TE |
2869 | error = ext4_get_inode_loc(inode, &iloc); |
2870 | if (error) { | |
2871 | EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); | |
2872 | goto cleanup; | |
2873 | } | |
30a7eb97 | 2874 | |
dec214d0 TE |
2875 | error = ext4_journal_get_write_access(handle, iloc.bh); |
2876 | if (error) { | |
2877 | EXT4_ERROR_INODE(inode, "write access (error %d)", | |
2878 | error); | |
2879 | goto cleanup; | |
2880 | } | |
e50e5129 | 2881 | |
dec214d0 TE |
2882 | header = IHDR(inode, ext4_raw_inode(&iloc)); |
2883 | if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) | |
2884 | ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, | |
2885 | IFIRST(header), | |
2886 | false /* block_csum */, | |
2887 | ea_inode_array, | |
2888 | extra_credits, | |
2889 | false /* skip_quota */); | |
ac27a0ec | 2890 | } |
e50e5129 | 2891 | |
dec214d0 TE |
2892 | if (EXT4_I(inode)->i_file_acl) { |
2893 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); | |
2894 | if (!bh) { | |
2895 | EXT4_ERROR_INODE(inode, "block %llu read error", | |
30a7eb97 | 2896 | EXT4_I(inode)->i_file_acl); |
dec214d0 TE |
2897 | error = -EIO; |
2898 | goto cleanup; | |
2899 | } | |
2900 | error = ext4_xattr_check_block(inode, bh); | |
de05ca85 | 2901 | if (error) |
e50e5129 | 2902 | goto cleanup; |
e50e5129 | 2903 | |
dec214d0 TE |
2904 | if (ext4_has_feature_ea_inode(inode->i_sb)) { |
2905 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
a6d05676 TE |
2906 | entry = EXT4_XATTR_NEXT(entry)) { |
2907 | if (!entry->e_value_inum) | |
2908 | continue; | |
2909 | error = ext4_xattr_inode_iget(inode, | |
2910 | le32_to_cpu(entry->e_value_inum), | |
2911 | le32_to_cpu(entry->e_hash), | |
2912 | &ea_inode); | |
2913 | if (error) | |
2914 | continue; | |
2915 | ext4_xattr_inode_free_quota(inode, ea_inode, | |
dec214d0 | 2916 | le32_to_cpu(entry->e_value_size)); |
a6d05676 TE |
2917 | iput(ea_inode); |
2918 | } | |
dec214d0 TE |
2919 | |
2920 | } | |
2921 | ||
2922 | ext4_xattr_release_block(handle, inode, bh, ea_inode_array, | |
2923 | extra_credits); | |
2924 | /* | |
2925 | * Update i_file_acl value in the same transaction that releases | |
2926 | * block. | |
2927 | */ | |
2928 | EXT4_I(inode)->i_file_acl = 0; | |
2929 | error = ext4_mark_inode_dirty(handle, inode); | |
2930 | if (error) { | |
2931 | EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", | |
2932 | error); | |
2933 | goto cleanup; | |
2934 | } | |
30a7eb97 | 2935 | } |
dec214d0 | 2936 | error = 0; |
ac27a0ec | 2937 | cleanup: |
30a7eb97 | 2938 | brelse(iloc.bh); |
ac27a0ec | 2939 | brelse(bh); |
e50e5129 AD |
2940 | return error; |
2941 | } | |
2942 | ||
0421a189 | 2943 | void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) |
e50e5129 | 2944 | { |
dec214d0 | 2945 | int idx; |
e50e5129 | 2946 | |
0421a189 | 2947 | if (ea_inode_array == NULL) |
e50e5129 AD |
2948 | return; |
2949 | ||
dec214d0 TE |
2950 | for (idx = 0; idx < ea_inode_array->count; ++idx) |
2951 | iput(ea_inode_array->inodes[idx]); | |
0421a189 | 2952 | kfree(ea_inode_array); |
ac27a0ec DK |
2953 | } |
2954 | ||
ac27a0ec | 2955 | /* |
47387409 | 2956 | * ext4_xattr_block_cache_insert() |
ac27a0ec | 2957 | * |
47387409 | 2958 | * Create a new entry in the extended attribute block cache, and insert |
ac27a0ec DK |
2959 | * it unless such an entry is already in the cache. |
2960 | * | |
2961 | * Returns 0, or a negative error number on failure. | |
2962 | */ | |
2963 | static void | |
47387409 TE |
2964 | ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, |
2965 | struct buffer_head *bh) | |
ac27a0ec | 2966 | { |
6048c64b AG |
2967 | struct ext4_xattr_header *header = BHDR(bh); |
2968 | __u32 hash = le32_to_cpu(header->h_hash); | |
2969 | int reusable = le32_to_cpu(header->h_refcount) < | |
2970 | EXT4_XATTR_REFCOUNT_MAX; | |
ac27a0ec DK |
2971 | int error; |
2972 | ||
cdb7ee4c TE |
2973 | if (!ea_block_cache) |
2974 | return; | |
47387409 | 2975 | error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, |
6048c64b | 2976 | bh->b_blocknr, reusable); |
ac27a0ec | 2977 | if (error) { |
82939d79 | 2978 | if (error == -EBUSY) |
ac27a0ec | 2979 | ea_bdebug(bh, "already in cache"); |
82939d79 | 2980 | } else |
ac27a0ec | 2981 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
2982 | } |
2983 | ||
2984 | /* | |
617ba13b | 2985 | * ext4_xattr_cmp() |
ac27a0ec DK |
2986 | * |
2987 | * Compare two extended attribute blocks for equality. | |
2988 | * | |
2989 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
2990 | * a negative error number on errors. | |
2991 | */ | |
2992 | static int | |
617ba13b MC |
2993 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
2994 | struct ext4_xattr_header *header2) | |
ac27a0ec | 2995 | { |
617ba13b | 2996 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
2997 | |
2998 | entry1 = ENTRY(header1+1); | |
2999 | entry2 = ENTRY(header2+1); | |
3000 | while (!IS_LAST_ENTRY(entry1)) { | |
3001 | if (IS_LAST_ENTRY(entry2)) | |
3002 | return 1; | |
3003 | if (entry1->e_hash != entry2->e_hash || | |
3004 | entry1->e_name_index != entry2->e_name_index || | |
3005 | entry1->e_name_len != entry2->e_name_len || | |
3006 | entry1->e_value_size != entry2->e_value_size || | |
e50e5129 | 3007 | entry1->e_value_inum != entry2->e_value_inum || |
ac27a0ec DK |
3008 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) |
3009 | return 1; | |
7cec1918 TE |
3010 | if (!entry1->e_value_inum && |
3011 | memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), | |
ac27a0ec DK |
3012 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), |
3013 | le32_to_cpu(entry1->e_value_size))) | |
3014 | return 1; | |
3015 | ||
617ba13b MC |
3016 | entry1 = EXT4_XATTR_NEXT(entry1); |
3017 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
3018 | } |
3019 | if (!IS_LAST_ENTRY(entry2)) | |
3020 | return 1; | |
3021 | return 0; | |
3022 | } | |
3023 | ||
3024 | /* | |
47387409 | 3025 | * ext4_xattr_block_cache_find() |
ac27a0ec DK |
3026 | * |
3027 | * Find an identical extended attribute block. | |
3028 | * | |
3029 | * Returns a pointer to the block found, or NULL if such a block was | |
3030 | * not found or an error occurred. | |
3031 | */ | |
3032 | static struct buffer_head * | |
47387409 TE |
3033 | ext4_xattr_block_cache_find(struct inode *inode, |
3034 | struct ext4_xattr_header *header, | |
3035 | struct mb_cache_entry **pce) | |
ac27a0ec DK |
3036 | { |
3037 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 | 3038 | struct mb_cache_entry *ce; |
47387409 | 3039 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec | 3040 | |
cdb7ee4c TE |
3041 | if (!ea_block_cache) |
3042 | return NULL; | |
ac27a0ec DK |
3043 | if (!header->h_hash) |
3044 | return NULL; /* never share */ | |
3045 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
47387409 | 3046 | ce = mb_cache_entry_find_first(ea_block_cache, hash); |
ac27a0ec DK |
3047 | while (ce) { |
3048 | struct buffer_head *bh; | |
3049 | ||
c07dfcb4 | 3050 | bh = sb_bread(inode->i_sb, ce->e_value); |
ac27a0ec | 3051 | if (!bh) { |
24676da4 | 3052 | EXT4_ERROR_INODE(inode, "block %lu read error", |
c07dfcb4 | 3053 | (unsigned long)ce->e_value); |
617ba13b | 3054 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
ac27a0ec DK |
3055 | *pce = ce; |
3056 | return bh; | |
3057 | } | |
3058 | brelse(bh); | |
47387409 | 3059 | ce = mb_cache_entry_find_next(ea_block_cache, ce); |
ac27a0ec DK |
3060 | } |
3061 | return NULL; | |
3062 | } | |
3063 | ||
3064 | #define NAME_HASH_SHIFT 5 | |
3065 | #define VALUE_HASH_SHIFT 16 | |
3066 | ||
3067 | /* | |
617ba13b | 3068 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
3069 | * |
3070 | * Compute the hash of an extended attribute. | |
3071 | */ | |
b9fc761e TE |
3072 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
3073 | size_t value_count) | |
ac27a0ec DK |
3074 | { |
3075 | __u32 hash = 0; | |
ac27a0ec | 3076 | |
b9fc761e | 3077 | while (name_len--) { |
ac27a0ec DK |
3078 | hash = (hash << NAME_HASH_SHIFT) ^ |
3079 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
3080 | *name++; | |
3081 | } | |
b9fc761e TE |
3082 | while (value_count--) { |
3083 | hash = (hash << VALUE_HASH_SHIFT) ^ | |
3084 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
3085 | le32_to_cpu(*value++); | |
ac27a0ec | 3086 | } |
b9fc761e | 3087 | return cpu_to_le32(hash); |
ac27a0ec DK |
3088 | } |
3089 | ||
3090 | #undef NAME_HASH_SHIFT | |
3091 | #undef VALUE_HASH_SHIFT | |
3092 | ||
3093 | #define BLOCK_HASH_SHIFT 16 | |
3094 | ||
3095 | /* | |
617ba13b | 3096 | * ext4_xattr_rehash() |
ac27a0ec DK |
3097 | * |
3098 | * Re-compute the extended attribute hash value after an entry has changed. | |
3099 | */ | |
daf83281 | 3100 | static void ext4_xattr_rehash(struct ext4_xattr_header *header) |
ac27a0ec | 3101 | { |
617ba13b | 3102 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
3103 | __u32 hash = 0; |
3104 | ||
ac27a0ec DK |
3105 | here = ENTRY(header+1); |
3106 | while (!IS_LAST_ENTRY(here)) { | |
3107 | if (!here->e_hash) { | |
3108 | /* Block is not shared if an entry's hash value == 0 */ | |
3109 | hash = 0; | |
3110 | break; | |
3111 | } | |
3112 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
3113 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
3114 | le32_to_cpu(here->e_hash); | |
617ba13b | 3115 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
3116 | } |
3117 | header->h_hash = cpu_to_le32(hash); | |
3118 | } | |
3119 | ||
3120 | #undef BLOCK_HASH_SHIFT | |
3121 | ||
9c191f70 M |
3122 | #define HASH_BUCKET_BITS 10 |
3123 | ||
7a2508e1 | 3124 | struct mb_cache * |
82939d79 | 3125 | ext4_xattr_create_cache(void) |
ac27a0ec | 3126 | { |
7a2508e1 | 3127 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
3128 | } |
3129 | ||
7a2508e1 | 3130 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 3131 | { |
9c191f70 | 3132 | if (cache) |
7a2508e1 | 3133 | mb_cache_destroy(cache); |
ac27a0ec | 3134 | } |
9c191f70 | 3135 |