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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> |
3dcf5451 CH |
59 | #include "ext4_jbd2.h" |
60 | #include "ext4.h" | |
ac27a0ec DK |
61 | #include "xattr.h" |
62 | #include "acl.h" | |
63 | ||
617ba13b | 64 | #ifdef EXT4_XATTR_DEBUG |
d74f3d25 JP |
65 | # define ea_idebug(inode, fmt, ...) \ |
66 | printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \ | |
67 | inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__) | |
68 | # define ea_bdebug(bh, fmt, ...) \ | |
69 | printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \ | |
70 | bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__) | |
ac27a0ec | 71 | #else |
ace36ad4 JP |
72 | # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
73 | # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) | |
ac27a0ec DK |
74 | #endif |
75 | ||
47387409 TE |
76 | static void ext4_xattr_block_cache_insert(struct mb_cache *, |
77 | struct buffer_head *); | |
78 | static struct buffer_head * | |
79 | ext4_xattr_block_cache_find(struct inode *, struct ext4_xattr_header *, | |
80 | struct mb_cache_entry **); | |
b9fc761e TE |
81 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
82 | size_t value_count); | |
daf83281 | 83 | static void ext4_xattr_rehash(struct ext4_xattr_header *); |
ac27a0ec | 84 | |
d6006186 | 85 | static const struct xattr_handler * const ext4_xattr_handler_map[] = { |
617ba13b | 86 | [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, |
03010a33 | 87 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
88 | [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
89 | [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, | |
ac27a0ec | 90 | #endif |
617ba13b | 91 | [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, |
03010a33 | 92 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 93 | [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, |
ac27a0ec DK |
94 | #endif |
95 | }; | |
96 | ||
11e27528 | 97 | const struct xattr_handler *ext4_xattr_handlers[] = { |
617ba13b MC |
98 | &ext4_xattr_user_handler, |
99 | &ext4_xattr_trusted_handler, | |
03010a33 | 100 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
101 | &posix_acl_access_xattr_handler, |
102 | &posix_acl_default_xattr_handler, | |
ac27a0ec | 103 | #endif |
03010a33 | 104 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 105 | &ext4_xattr_security_handler, |
ac27a0ec DK |
106 | #endif |
107 | NULL | |
108 | }; | |
109 | ||
47387409 TE |
110 | #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ |
111 | inode->i_sb->s_fs_info)->s_ea_block_cache) | |
9c191f70 | 112 | |
dec214d0 TE |
113 | #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ |
114 | inode->i_sb->s_fs_info)->s_ea_inode_cache) | |
115 | ||
30a7eb97 TE |
116 | static int |
117 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, | |
118 | struct inode *inode); | |
119 | ||
33d201e0 TE |
120 | #ifdef CONFIG_LOCKDEP |
121 | void ext4_xattr_inode_set_class(struct inode *ea_inode) | |
122 | { | |
123 | lockdep_set_subclass(&ea_inode->i_rwsem, 1); | |
124 | } | |
125 | #endif | |
126 | ||
cc8e94fd DW |
127 | static __le32 ext4_xattr_block_csum(struct inode *inode, |
128 | sector_t block_nr, | |
129 | struct ext4_xattr_header *hdr) | |
130 | { | |
131 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
d6a77105 | 132 | __u32 csum; |
d6a77105 | 133 | __le64 dsk_block_nr = cpu_to_le64(block_nr); |
b47820ed DJ |
134 | __u32 dummy_csum = 0; |
135 | int offset = offsetof(struct ext4_xattr_header, h_checksum); | |
cc8e94fd | 136 | |
d6a77105 TT |
137 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, |
138 | sizeof(dsk_block_nr)); | |
b47820ed DJ |
139 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); |
140 | csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); | |
141 | offset += sizeof(dummy_csum); | |
142 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, | |
143 | EXT4_BLOCK_SIZE(inode->i_sb) - offset); | |
41eb70dd | 144 | |
cc8e94fd DW |
145 | return cpu_to_le32(csum); |
146 | } | |
147 | ||
148 | static int ext4_xattr_block_csum_verify(struct inode *inode, | |
dac7a4b4 | 149 | struct buffer_head *bh) |
cc8e94fd | 150 | { |
dac7a4b4 TT |
151 | struct ext4_xattr_header *hdr = BHDR(bh); |
152 | int ret = 1; | |
cc8e94fd | 153 | |
dac7a4b4 TT |
154 | if (ext4_has_metadata_csum(inode->i_sb)) { |
155 | lock_buffer(bh); | |
156 | ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, | |
157 | bh->b_blocknr, hdr)); | |
158 | unlock_buffer(bh); | |
159 | } | |
160 | return ret; | |
cc8e94fd DW |
161 | } |
162 | ||
dac7a4b4 TT |
163 | static void ext4_xattr_block_csum_set(struct inode *inode, |
164 | struct buffer_head *bh) | |
cc8e94fd | 165 | { |
dac7a4b4 TT |
166 | if (ext4_has_metadata_csum(inode->i_sb)) |
167 | BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, | |
168 | bh->b_blocknr, BHDR(bh)); | |
cc8e94fd DW |
169 | } |
170 | ||
11e27528 | 171 | static inline const struct xattr_handler * |
617ba13b | 172 | ext4_xattr_handler(int name_index) |
ac27a0ec | 173 | { |
11e27528 | 174 | const struct xattr_handler *handler = NULL; |
ac27a0ec | 175 | |
617ba13b MC |
176 | if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
177 | handler = ext4_xattr_handler_map[name_index]; | |
ac27a0ec DK |
178 | return handler; |
179 | } | |
180 | ||
ac27a0ec | 181 | static int |
2c4f9923 EB |
182 | ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, |
183 | void *value_start) | |
ac27a0ec | 184 | { |
a0626e75 DW |
185 | struct ext4_xattr_entry *e = entry; |
186 | ||
d7614cc1 | 187 | /* Find the end of the names list */ |
a0626e75 DW |
188 | while (!IS_LAST_ENTRY(e)) { |
189 | struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); | |
ac27a0ec | 190 | if ((void *)next >= end) |
6a797d27 | 191 | return -EFSCORRUPTED; |
7773a6d9 TT |
192 | if (strnlen(e->e_name, e->e_name_len) != e->e_name_len) |
193 | return -EFSCORRUPTED; | |
a0626e75 | 194 | e = next; |
ac27a0ec | 195 | } |
a0626e75 | 196 | |
d7614cc1 | 197 | /* Check the values */ |
a0626e75 | 198 | while (!IS_LAST_ENTRY(entry)) { |
a57eb14b EB |
199 | u32 size = le32_to_cpu(entry->e_value_size); |
200 | ||
e7793f2a | 201 | if (size > EXT4_XATTR_SIZE_MAX) |
a57eb14b EB |
202 | return -EFSCORRUPTED; |
203 | ||
204 | if (size != 0 && entry->e_value_inum == 0) { | |
d7614cc1 | 205 | u16 offs = le16_to_cpu(entry->e_value_offs); |
d7614cc1 EB |
206 | void *value; |
207 | ||
208 | /* | |
209 | * The value cannot overlap the names, and the value | |
210 | * with padding cannot extend beyond 'end'. Check both | |
211 | * the padded and unpadded sizes, since the size may | |
212 | * overflow to 0 when adding padding. | |
213 | */ | |
214 | if (offs > end - value_start) | |
215 | return -EFSCORRUPTED; | |
216 | value = value_start + offs; | |
217 | if (value < (void *)e + sizeof(u32) || | |
218 | size > end - value || | |
219 | EXT4_XATTR_SIZE(size) > end - value) | |
220 | return -EFSCORRUPTED; | |
221 | } | |
a0626e75 DW |
222 | entry = EXT4_XATTR_NEXT(entry); |
223 | } | |
224 | ||
ac27a0ec DK |
225 | return 0; |
226 | } | |
227 | ||
228 | static inline int | |
598e04ae TT |
229 | __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh, |
230 | const char *function, unsigned int line) | |
ac27a0ec | 231 | { |
598e04ae | 232 | int error = -EFSCORRUPTED; |
cc8e94fd | 233 | |
617ba13b | 234 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 235 | BHDR(bh)->h_blocks != cpu_to_le32(1)) |
598e04ae | 236 | goto errout; |
3150e891 TT |
237 | if (buffer_verified(bh)) |
238 | return 0; | |
239 | ||
598e04ae | 240 | error = -EFSBADCRC; |
dac7a4b4 | 241 | if (!ext4_xattr_block_csum_verify(inode, bh)) |
598e04ae | 242 | goto errout; |
2c4f9923 EB |
243 | error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, |
244 | bh->b_data); | |
598e04ae TT |
245 | errout: |
246 | if (error) | |
247 | __ext4_error_inode(inode, function, line, 0, | |
248 | "corrupted xattr block %llu", | |
249 | (unsigned long long) bh->b_blocknr); | |
250 | else | |
cc8e94fd DW |
251 | set_buffer_verified(bh); |
252 | return error; | |
ac27a0ec DK |
253 | } |
254 | ||
598e04ae TT |
255 | #define ext4_xattr_check_block(inode, bh) \ |
256 | __ext4_xattr_check_block((inode), (bh), __func__, __LINE__) | |
257 | ||
258 | ||
9e92f48c TT |
259 | static int |
260 | __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, | |
261 | void *end, const char *function, unsigned int line) | |
262 | { | |
9e92f48c TT |
263 | int error = -EFSCORRUPTED; |
264 | ||
290ab230 | 265 | if (end - (void *)header < sizeof(*header) + sizeof(u32) || |
19962509 | 266 | (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) |
9e92f48c | 267 | goto errout; |
2c4f9923 | 268 | error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); |
9e92f48c TT |
269 | errout: |
270 | if (error) | |
271 | __ext4_error_inode(inode, function, line, 0, | |
272 | "corrupted in-inode xattr"); | |
273 | return error; | |
274 | } | |
275 | ||
276 | #define xattr_check_inode(inode, header, end) \ | |
277 | __xattr_check_inode((inode), (header), (end), __func__, __LINE__) | |
278 | ||
ac27a0ec | 279 | static int |
97039521 TT |
280 | xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry, |
281 | void *end, int name_index, const char *name, int sorted) | |
ac27a0ec | 282 | { |
97039521 | 283 | struct ext4_xattr_entry *entry, *next; |
ac27a0ec DK |
284 | size_t name_len; |
285 | int cmp = 1; | |
286 | ||
287 | if (name == NULL) | |
288 | return -EINVAL; | |
289 | name_len = strlen(name); | |
97039521 TT |
290 | for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) { |
291 | next = EXT4_XATTR_NEXT(entry); | |
292 | if ((void *) next >= end) { | |
293 | EXT4_ERROR_INODE(inode, "corrupted xattr entries"); | |
294 | return -EFSCORRUPTED; | |
295 | } | |
ac27a0ec DK |
296 | cmp = name_index - entry->e_name_index; |
297 | if (!cmp) | |
298 | cmp = name_len - entry->e_name_len; | |
299 | if (!cmp) | |
300 | cmp = memcmp(name, entry->e_name, name_len); | |
301 | if (cmp <= 0 && (sorted || cmp == 0)) | |
302 | break; | |
303 | } | |
304 | *pentry = entry; | |
ac27a0ec DK |
305 | return cmp ? -ENODATA : 0; |
306 | } | |
307 | ||
dec214d0 TE |
308 | static u32 |
309 | ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) | |
310 | { | |
311 | return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); | |
312 | } | |
313 | ||
314 | static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) | |
315 | { | |
316 | return ((u64)ea_inode->i_ctime.tv_sec << 32) | | |
317 | ((u32)ea_inode->i_version); | |
318 | } | |
319 | ||
320 | static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) | |
321 | { | |
322 | ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); | |
323 | ea_inode->i_version = (u32)ref_count; | |
324 | } | |
325 | ||
326 | static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) | |
327 | { | |
328 | return (u32)ea_inode->i_atime.tv_sec; | |
329 | } | |
330 | ||
331 | static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) | |
332 | { | |
333 | ea_inode->i_atime.tv_sec = hash; | |
334 | } | |
335 | ||
e50e5129 AD |
336 | /* |
337 | * Read the EA value from an inode. | |
338 | */ | |
90966693 | 339 | static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) |
e50e5129 | 340 | { |
9699d4f9 TE |
341 | int blocksize = 1 << ea_inode->i_blkbits; |
342 | int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; | |
343 | int tail_size = (size % blocksize) ?: blocksize; | |
344 | struct buffer_head *bhs_inline[8]; | |
345 | struct buffer_head **bhs = bhs_inline; | |
346 | int i, ret; | |
347 | ||
348 | if (bh_count > ARRAY_SIZE(bhs_inline)) { | |
349 | bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); | |
350 | if (!bhs) | |
351 | return -ENOMEM; | |
352 | } | |
90966693 | 353 | |
9699d4f9 TE |
354 | ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, |
355 | true /* wait */, bhs); | |
356 | if (ret) | |
357 | goto free_bhs; | |
e50e5129 | 358 | |
9699d4f9 TE |
359 | for (i = 0; i < bh_count; i++) { |
360 | /* There shouldn't be any holes in ea_inode. */ | |
361 | if (!bhs[i]) { | |
362 | ret = -EFSCORRUPTED; | |
363 | goto put_bhs; | |
364 | } | |
365 | memcpy((char *)buf + blocksize * i, bhs[i]->b_data, | |
366 | i < bh_count - 1 ? blocksize : tail_size); | |
e50e5129 | 367 | } |
9699d4f9 TE |
368 | ret = 0; |
369 | put_bhs: | |
370 | for (i = 0; i < bh_count; i++) | |
371 | brelse(bhs[i]); | |
372 | free_bhs: | |
373 | if (bhs != bhs_inline) | |
374 | kfree(bhs); | |
375 | return ret; | |
e50e5129 AD |
376 | } |
377 | ||
a6d05676 TE |
378 | #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) |
379 | ||
bab79b04 | 380 | static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, |
a6d05676 | 381 | u32 ea_inode_hash, struct inode **ea_inode) |
e50e5129 | 382 | { |
bab79b04 TE |
383 | struct inode *inode; |
384 | int err; | |
e50e5129 | 385 | |
bab79b04 TE |
386 | inode = ext4_iget(parent->i_sb, ea_ino); |
387 | if (IS_ERR(inode)) { | |
388 | err = PTR_ERR(inode); | |
dec214d0 TE |
389 | ext4_error(parent->i_sb, |
390 | "error while reading EA inode %lu err=%d", ea_ino, | |
391 | err); | |
bab79b04 | 392 | return err; |
e50e5129 AD |
393 | } |
394 | ||
bab79b04 | 395 | if (is_bad_inode(inode)) { |
dec214d0 TE |
396 | ext4_error(parent->i_sb, |
397 | "error while reading EA inode %lu is_bad_inode", | |
398 | ea_ino); | |
bab79b04 TE |
399 | err = -EIO; |
400 | goto error; | |
401 | } | |
402 | ||
bab79b04 | 403 | if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { |
dec214d0 TE |
404 | ext4_error(parent->i_sb, |
405 | "EA inode %lu does not have EXT4_EA_INODE_FL flag", | |
406 | ea_ino); | |
bab79b04 | 407 | err = -EINVAL; |
e50e5129 AD |
408 | goto error; |
409 | } | |
410 | ||
a6d05676 TE |
411 | ext4_xattr_inode_set_class(inode); |
412 | ||
413 | /* | |
414 | * Check whether this is an old Lustre-style xattr inode. Lustre | |
415 | * implementation does not have hash validation, rather it has a | |
416 | * backpointer from ea_inode to the parent inode. | |
417 | */ | |
418 | if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && | |
419 | EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && | |
420 | inode->i_generation == parent->i_generation) { | |
421 | ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); | |
422 | ext4_xattr_inode_set_ref(inode, 1); | |
423 | } else { | |
424 | inode_lock(inode); | |
425 | inode->i_flags |= S_NOQUOTA; | |
426 | inode_unlock(inode); | |
427 | } | |
428 | ||
bab79b04 TE |
429 | *ea_inode = inode; |
430 | return 0; | |
e50e5129 | 431 | error: |
bab79b04 TE |
432 | iput(inode); |
433 | return err; | |
e50e5129 AD |
434 | } |
435 | ||
dec214d0 | 436 | static int |
b9fc761e TE |
437 | ext4_xattr_inode_verify_hashes(struct inode *ea_inode, |
438 | struct ext4_xattr_entry *entry, void *buffer, | |
439 | size_t size) | |
dec214d0 TE |
440 | { |
441 | u32 hash; | |
442 | ||
443 | /* Verify stored hash matches calculated hash. */ | |
444 | hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); | |
445 | if (hash != ext4_xattr_inode_get_hash(ea_inode)) | |
446 | return -EFSCORRUPTED; | |
b9fc761e TE |
447 | |
448 | if (entry) { | |
449 | __le32 e_hash, tmp_data; | |
450 | ||
451 | /* Verify entry hash. */ | |
452 | tmp_data = cpu_to_le32(hash); | |
453 | e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, | |
454 | &tmp_data, 1); | |
455 | if (e_hash != entry->e_hash) | |
456 | return -EFSCORRUPTED; | |
457 | } | |
dec214d0 TE |
458 | return 0; |
459 | } | |
460 | ||
e50e5129 | 461 | /* |
b9fc761e | 462 | * Read xattr value from the EA inode. |
e50e5129 AD |
463 | */ |
464 | static int | |
b9fc761e TE |
465 | ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, |
466 | void *buffer, size_t size) | |
e50e5129 | 467 | { |
dec214d0 | 468 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); |
bab79b04 | 469 | struct inode *ea_inode; |
dec214d0 | 470 | int err; |
e50e5129 | 471 | |
b9fc761e | 472 | err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), |
a6d05676 | 473 | le32_to_cpu(entry->e_hash), &ea_inode); |
dec214d0 TE |
474 | if (err) { |
475 | ea_inode = NULL; | |
476 | goto out; | |
477 | } | |
e50e5129 | 478 | |
dec214d0 TE |
479 | if (i_size_read(ea_inode) != size) { |
480 | ext4_warning_inode(ea_inode, | |
481 | "ea_inode file size=%llu entry size=%zu", | |
482 | i_size_read(ea_inode), size); | |
483 | err = -EFSCORRUPTED; | |
484 | goto out; | |
485 | } | |
e50e5129 | 486 | |
dec214d0 TE |
487 | err = ext4_xattr_inode_read(ea_inode, buffer, size); |
488 | if (err) | |
489 | goto out; | |
490 | ||
a6d05676 TE |
491 | if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { |
492 | err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, | |
493 | size); | |
494 | if (err) { | |
dec214d0 TE |
495 | ext4_warning_inode(ea_inode, |
496 | "EA inode hash validation failed"); | |
497 | goto out; | |
498 | } | |
dec214d0 | 499 | |
a6d05676 TE |
500 | if (ea_inode_cache) |
501 | mb_cache_entry_create(ea_inode_cache, GFP_NOFS, | |
502 | ext4_xattr_inode_get_hash(ea_inode), | |
503 | ea_inode->i_ino, true /* reusable */); | |
504 | } | |
dec214d0 TE |
505 | out: |
506 | iput(ea_inode); | |
507 | return err; | |
e50e5129 AD |
508 | } |
509 | ||
ac27a0ec | 510 | static int |
617ba13b | 511 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
512 | void *buffer, size_t buffer_size) |
513 | { | |
514 | struct buffer_head *bh = NULL; | |
617ba13b | 515 | struct ext4_xattr_entry *entry; |
ac27a0ec | 516 | size_t size; |
97039521 | 517 | void *end; |
ac27a0ec | 518 | int error; |
47387409 | 519 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec DK |
520 | |
521 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
522 | name_index, name, buffer, (long)buffer_size); | |
523 | ||
617ba13b | 524 | if (!EXT4_I(inode)->i_file_acl) |
9da1f6d0 | 525 | return -ENODATA; |
ace36ad4 JP |
526 | ea_idebug(inode, "reading block %llu", |
527 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
9da1f6d0 TT |
528 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
529 | if (IS_ERR(bh)) | |
530 | return PTR_ERR(bh); | |
ac27a0ec DK |
531 | ea_bdebug(bh, "b_count=%d, refcount=%d", |
532 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
598e04ae TT |
533 | error = ext4_xattr_check_block(inode, bh); |
534 | if (error) | |
ac27a0ec | 535 | goto cleanup; |
47387409 | 536 | ext4_xattr_block_cache_insert(ea_block_cache, bh); |
ac27a0ec | 537 | entry = BFIRST(bh); |
97039521 TT |
538 | end = bh->b_data + bh->b_size; |
539 | error = xattr_find_entry(inode, &entry, end, name_index, name, 1); | |
ac27a0ec DK |
540 | if (error) |
541 | goto cleanup; | |
542 | size = le32_to_cpu(entry->e_value_size); | |
e7793f2a TT |
543 | error = -ERANGE; |
544 | if (unlikely(size > EXT4_XATTR_SIZE_MAX)) | |
545 | goto cleanup; | |
ac27a0ec | 546 | if (buffer) { |
ac27a0ec DK |
547 | if (size > buffer_size) |
548 | goto cleanup; | |
e50e5129 | 549 | if (entry->e_value_inum) { |
b9fc761e TE |
550 | error = ext4_xattr_inode_get(inode, entry, buffer, |
551 | size); | |
e50e5129 AD |
552 | if (error) |
553 | goto cleanup; | |
554 | } else { | |
e7793f2a TT |
555 | u16 offset = le16_to_cpu(entry->e_value_offs); |
556 | void *p = bh->b_data + offset; | |
557 | ||
558 | if (unlikely(p + size > end)) | |
559 | goto cleanup; | |
560 | memcpy(buffer, p, size); | |
e50e5129 | 561 | } |
ac27a0ec DK |
562 | } |
563 | error = size; | |
564 | ||
565 | cleanup: | |
566 | brelse(bh); | |
567 | return error; | |
568 | } | |
569 | ||
879b3825 | 570 | int |
617ba13b | 571 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
572 | void *buffer, size_t buffer_size) |
573 | { | |
617ba13b MC |
574 | struct ext4_xattr_ibody_header *header; |
575 | struct ext4_xattr_entry *entry; | |
576 | struct ext4_inode *raw_inode; | |
577 | struct ext4_iloc iloc; | |
ac27a0ec DK |
578 | size_t size; |
579 | void *end; | |
580 | int error; | |
581 | ||
19f5fb7a | 582 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 583 | return -ENODATA; |
617ba13b | 584 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
585 | if (error) |
586 | return error; | |
617ba13b | 587 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 588 | header = IHDR(inode, raw_inode); |
617ba13b | 589 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 590 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
591 | if (error) |
592 | goto cleanup; | |
6ba644b9 | 593 | entry = IFIRST(header); |
97039521 | 594 | error = xattr_find_entry(inode, &entry, end, name_index, name, 0); |
ac27a0ec DK |
595 | if (error) |
596 | goto cleanup; | |
597 | size = le32_to_cpu(entry->e_value_size); | |
e7793f2a TT |
598 | error = -ERANGE; |
599 | if (unlikely(size > EXT4_XATTR_SIZE_MAX)) | |
600 | goto cleanup; | |
ac27a0ec | 601 | if (buffer) { |
ac27a0ec DK |
602 | if (size > buffer_size) |
603 | goto cleanup; | |
e50e5129 | 604 | if (entry->e_value_inum) { |
b9fc761e TE |
605 | error = ext4_xattr_inode_get(inode, entry, buffer, |
606 | size); | |
e50e5129 AD |
607 | if (error) |
608 | goto cleanup; | |
609 | } else { | |
e7793f2a TT |
610 | u16 offset = le16_to_cpu(entry->e_value_offs); |
611 | void *p = (void *)IFIRST(header) + offset; | |
612 | ||
613 | if (unlikely(p + size > end)) | |
614 | goto cleanup; | |
615 | memcpy(buffer, p, size); | |
e50e5129 | 616 | } |
ac27a0ec DK |
617 | } |
618 | error = size; | |
619 | ||
620 | cleanup: | |
621 | brelse(iloc.bh); | |
622 | return error; | |
623 | } | |
624 | ||
625 | /* | |
617ba13b | 626 | * ext4_xattr_get() |
ac27a0ec DK |
627 | * |
628 | * Copy an extended attribute into the buffer | |
629 | * provided, or compute the buffer size required. | |
630 | * Buffer is NULL to compute the size of the buffer required. | |
631 | * | |
632 | * Returns a negative error number on failure, or the number of bytes | |
633 | * used / required on success. | |
634 | */ | |
635 | int | |
617ba13b | 636 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
637 | void *buffer, size_t buffer_size) |
638 | { | |
639 | int error; | |
640 | ||
0db1ff22 TT |
641 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
642 | return -EIO; | |
643 | ||
230b8c1a ZZ |
644 | if (strlen(name) > 255) |
645 | return -ERANGE; | |
646 | ||
617ba13b MC |
647 | down_read(&EXT4_I(inode)->xattr_sem); |
648 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
649 | buffer_size); |
650 | if (error == -ENODATA) | |
617ba13b | 651 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 652 | buffer_size); |
617ba13b | 653 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
654 | return error; |
655 | } | |
656 | ||
657 | static int | |
431547b3 | 658 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
659 | char *buffer, size_t buffer_size) |
660 | { | |
661 | size_t rest = buffer_size; | |
662 | ||
617ba13b | 663 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 664 | const struct xattr_handler *handler = |
617ba13b | 665 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec | 666 | |
764a5c6b AG |
667 | if (handler && (!handler->list || handler->list(dentry))) { |
668 | const char *prefix = handler->prefix ?: handler->name; | |
669 | size_t prefix_len = strlen(prefix); | |
670 | size_t size = prefix_len + entry->e_name_len + 1; | |
671 | ||
ac27a0ec DK |
672 | if (buffer) { |
673 | if (size > rest) | |
674 | return -ERANGE; | |
764a5c6b AG |
675 | memcpy(buffer, prefix, prefix_len); |
676 | buffer += prefix_len; | |
677 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
678 | buffer += entry->e_name_len; | |
679 | *buffer++ = 0; | |
ac27a0ec DK |
680 | } |
681 | rest -= size; | |
682 | } | |
683 | } | |
764a5c6b | 684 | return buffer_size - rest; /* total size */ |
ac27a0ec DK |
685 | } |
686 | ||
687 | static int | |
431547b3 | 688 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 689 | { |
2b0143b5 | 690 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
691 | struct buffer_head *bh = NULL; |
692 | int error; | |
693 | ||
694 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
695 | buffer, (long)buffer_size); | |
696 | ||
617ba13b | 697 | if (!EXT4_I(inode)->i_file_acl) |
9da1f6d0 | 698 | return 0; |
ace36ad4 JP |
699 | ea_idebug(inode, "reading block %llu", |
700 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
9da1f6d0 TT |
701 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
702 | if (IS_ERR(bh)) | |
703 | return PTR_ERR(bh); | |
ac27a0ec DK |
704 | ea_bdebug(bh, "b_count=%d, refcount=%d", |
705 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
598e04ae TT |
706 | error = ext4_xattr_check_block(inode, bh); |
707 | if (error) | |
ac27a0ec | 708 | goto cleanup; |
47387409 | 709 | ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); |
9da1f6d0 TT |
710 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, |
711 | buffer_size); | |
ac27a0ec DK |
712 | cleanup: |
713 | brelse(bh); | |
ac27a0ec DK |
714 | return error; |
715 | } | |
716 | ||
717 | static int | |
431547b3 | 718 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 719 | { |
2b0143b5 | 720 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
721 | struct ext4_xattr_ibody_header *header; |
722 | struct ext4_inode *raw_inode; | |
723 | struct ext4_iloc iloc; | |
ac27a0ec DK |
724 | void *end; |
725 | int error; | |
726 | ||
19f5fb7a | 727 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 728 | return 0; |
617ba13b | 729 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
730 | if (error) |
731 | return error; | |
617ba13b | 732 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 733 | header = IHDR(inode, raw_inode); |
617ba13b | 734 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 735 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
736 | if (error) |
737 | goto cleanup; | |
431547b3 | 738 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
739 | buffer, buffer_size); |
740 | ||
741 | cleanup: | |
742 | brelse(iloc.bh); | |
743 | return error; | |
744 | } | |
745 | ||
746 | /* | |
ba7ea1d8 EB |
747 | * Inode operation listxattr() |
748 | * | |
749 | * d_inode(dentry)->i_rwsem: don't care | |
ac27a0ec DK |
750 | * |
751 | * Copy a list of attribute names into the buffer | |
752 | * provided, or compute the buffer size required. | |
753 | * Buffer is NULL to compute the size of the buffer required. | |
754 | * | |
755 | * Returns a negative error number on failure, or the number of bytes | |
756 | * used / required on success. | |
757 | */ | |
ba7ea1d8 EB |
758 | ssize_t |
759 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
ac27a0ec | 760 | { |
eaeef867 | 761 | int ret, ret2; |
ac27a0ec | 762 | |
2b0143b5 | 763 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
764 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
765 | if (ret < 0) | |
766 | goto errout; | |
767 | if (buffer) { | |
768 | buffer += ret; | |
769 | buffer_size -= ret; | |
ac27a0ec | 770 | } |
eaeef867 TT |
771 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
772 | if (ret < 0) | |
773 | goto errout; | |
774 | ret += ret2; | |
775 | errout: | |
2b0143b5 | 776 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 777 | return ret; |
ac27a0ec DK |
778 | } |
779 | ||
780 | /* | |
617ba13b | 781 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
782 | * not set, set it. |
783 | */ | |
617ba13b | 784 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
785 | struct super_block *sb) |
786 | { | |
e2b911c5 | 787 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
788 | return; |
789 | ||
5d601255 | 790 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 791 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
e2b911c5 | 792 | ext4_set_feature_xattr(sb); |
a0375156 | 793 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec | 794 | } |
ac27a0ec DK |
795 | } |
796 | ||
7a9ca53a TE |
797 | int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) |
798 | { | |
799 | struct ext4_iloc iloc = { .bh = NULL }; | |
800 | struct buffer_head *bh = NULL; | |
801 | struct ext4_inode *raw_inode; | |
802 | struct ext4_xattr_ibody_header *header; | |
803 | struct ext4_xattr_entry *entry; | |
804 | qsize_t ea_inode_refs = 0; | |
805 | void *end; | |
806 | int ret; | |
807 | ||
808 | lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); | |
809 | ||
810 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
811 | ret = ext4_get_inode_loc(inode, &iloc); | |
812 | if (ret) | |
813 | goto out; | |
814 | raw_inode = ext4_raw_inode(&iloc); | |
815 | header = IHDR(inode, raw_inode); | |
816 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
817 | ret = xattr_check_inode(inode, header, end); | |
818 | if (ret) | |
819 | goto out; | |
820 | ||
821 | for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); | |
822 | entry = EXT4_XATTR_NEXT(entry)) | |
823 | if (entry->e_value_inum) | |
824 | ea_inode_refs++; | |
825 | } | |
826 | ||
827 | if (EXT4_I(inode)->i_file_acl) { | |
9da1f6d0 TT |
828 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
829 | if (IS_ERR(bh)) { | |
830 | ret = PTR_ERR(bh); | |
7a9ca53a TE |
831 | goto out; |
832 | } | |
833 | ||
598e04ae TT |
834 | ret = ext4_xattr_check_block(inode, bh); |
835 | if (ret) | |
7a9ca53a | 836 | goto out; |
7a9ca53a TE |
837 | |
838 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
839 | entry = EXT4_XATTR_NEXT(entry)) | |
840 | if (entry->e_value_inum) | |
841 | ea_inode_refs++; | |
842 | } | |
843 | *usage = ea_inode_refs + 1; | |
844 | ret = 0; | |
845 | out: | |
846 | brelse(iloc.bh); | |
847 | brelse(bh); | |
848 | return ret; | |
849 | } | |
850 | ||
dec214d0 TE |
851 | static inline size_t round_up_cluster(struct inode *inode, size_t length) |
852 | { | |
853 | struct super_block *sb = inode->i_sb; | |
854 | size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + | |
855 | inode->i_blkbits); | |
856 | size_t mask = ~(cluster_size - 1); | |
857 | ||
858 | return (length + cluster_size - 1) & mask; | |
859 | } | |
860 | ||
861 | static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) | |
862 | { | |
863 | int err; | |
864 | ||
865 | err = dquot_alloc_inode(inode); | |
866 | if (err) | |
867 | return err; | |
868 | err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); | |
869 | if (err) | |
870 | dquot_free_inode(inode); | |
871 | return err; | |
872 | } | |
873 | ||
a6d05676 TE |
874 | static void ext4_xattr_inode_free_quota(struct inode *parent, |
875 | struct inode *ea_inode, | |
876 | size_t len) | |
dec214d0 | 877 | { |
a6d05676 TE |
878 | if (ea_inode && |
879 | ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) | |
880 | return; | |
881 | dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); | |
882 | dquot_free_inode(parent); | |
dec214d0 TE |
883 | } |
884 | ||
af65207c TE |
885 | int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, |
886 | struct buffer_head *block_bh, size_t value_len, | |
887 | bool is_create) | |
dec214d0 | 888 | { |
dec214d0 TE |
889 | int credits; |
890 | int blocks; | |
891 | ||
892 | /* | |
893 | * 1) Owner inode update | |
894 | * 2) Ref count update on old xattr block | |
895 | * 3) new xattr block | |
896 | * 4) block bitmap update for new xattr block | |
897 | * 5) group descriptor for new xattr block | |
898 | * 6) block bitmap update for old xattr block | |
899 | * 7) group descriptor for old block | |
900 | * | |
901 | * 6 & 7 can happen if we have two racing threads T_a and T_b | |
902 | * which are each trying to set an xattr on inodes I_a and I_b | |
903 | * which were both initially sharing an xattr block. | |
904 | */ | |
905 | credits = 7; | |
906 | ||
907 | /* Quota updates. */ | |
908 | credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); | |
909 | ||
910 | /* | |
911 | * In case of inline data, we may push out the data to a block, | |
912 | * so we need to reserve credits for this eventuality | |
913 | */ | |
af65207c | 914 | if (inode && ext4_has_inline_data(inode)) |
dec214d0 TE |
915 | credits += ext4_writepage_trans_blocks(inode) + 1; |
916 | ||
917 | /* We are done if ea_inode feature is not enabled. */ | |
918 | if (!ext4_has_feature_ea_inode(sb)) | |
919 | return credits; | |
920 | ||
921 | /* New ea_inode, inode map, block bitmap, group descriptor. */ | |
922 | credits += 4; | |
923 | ||
924 | /* Data blocks. */ | |
925 | blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; | |
926 | ||
927 | /* Indirection block or one level of extent tree. */ | |
928 | blocks += 1; | |
929 | ||
930 | /* Block bitmap and group descriptor updates for each block. */ | |
931 | credits += blocks * 2; | |
932 | ||
933 | /* Blocks themselves. */ | |
934 | credits += blocks; | |
935 | ||
af65207c TE |
936 | if (!is_create) { |
937 | /* Dereference ea_inode holding old xattr value. | |
938 | * Old ea_inode, inode map, block bitmap, group descriptor. | |
939 | */ | |
940 | credits += 4; | |
dec214d0 | 941 | |
af65207c TE |
942 | /* Data blocks for old ea_inode. */ |
943 | blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; | |
dec214d0 | 944 | |
af65207c TE |
945 | /* Indirection block or one level of extent tree for old |
946 | * ea_inode. | |
947 | */ | |
948 | blocks += 1; | |
dec214d0 | 949 | |
af65207c TE |
950 | /* Block bitmap and group descriptor updates for each block. */ |
951 | credits += blocks * 2; | |
952 | } | |
dec214d0 TE |
953 | |
954 | /* We may need to clone the existing xattr block in which case we need | |
955 | * to increment ref counts for existing ea_inodes referenced by it. | |
956 | */ | |
957 | if (block_bh) { | |
958 | struct ext4_xattr_entry *entry = BFIRST(block_bh); | |
959 | ||
960 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) | |
961 | if (entry->e_value_inum) | |
962 | /* Ref count update on ea_inode. */ | |
963 | credits += 1; | |
964 | } | |
965 | return credits; | |
966 | } | |
967 | ||
30a7eb97 TE |
968 | static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode, |
969 | int credits, struct buffer_head *bh, | |
970 | bool dirty, bool block_csum) | |
971 | { | |
972 | int error; | |
973 | ||
974 | if (!ext4_handle_valid(handle)) | |
975 | return 0; | |
976 | ||
977 | if (handle->h_buffer_credits >= credits) | |
978 | return 0; | |
979 | ||
980 | error = ext4_journal_extend(handle, credits - handle->h_buffer_credits); | |
981 | if (!error) | |
982 | return 0; | |
983 | if (error < 0) { | |
984 | ext4_warning(inode->i_sb, "Extend journal (error %d)", error); | |
985 | return error; | |
986 | } | |
987 | ||
988 | if (bh && dirty) { | |
989 | if (block_csum) | |
990 | ext4_xattr_block_csum_set(inode, bh); | |
991 | error = ext4_handle_dirty_metadata(handle, NULL, bh); | |
992 | if (error) { | |
993 | ext4_warning(inode->i_sb, "Handle metadata (error %d)", | |
994 | error); | |
995 | return error; | |
996 | } | |
997 | } | |
998 | ||
999 | error = ext4_journal_restart(handle, credits); | |
1000 | if (error) { | |
1001 | ext4_warning(inode->i_sb, "Restart journal (error %d)", error); | |
1002 | return error; | |
1003 | } | |
1004 | ||
1005 | if (bh) { | |
1006 | error = ext4_journal_get_write_access(handle, bh); | |
1007 | if (error) { | |
1008 | ext4_warning(inode->i_sb, | |
1009 | "Get write access failed (error %d)", | |
1010 | error); | |
1011 | return error; | |
1012 | } | |
1013 | } | |
1014 | return 0; | |
1015 | } | |
1016 | ||
dec214d0 TE |
1017 | static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, |
1018 | int ref_change) | |
1019 | { | |
1020 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); | |
1021 | struct ext4_iloc iloc; | |
1022 | s64 ref_count; | |
1023 | u32 hash; | |
1024 | int ret; | |
1025 | ||
1026 | inode_lock(ea_inode); | |
1027 | ||
1028 | ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); | |
1029 | if (ret) { | |
1030 | iloc.bh = NULL; | |
1031 | goto out; | |
1032 | } | |
1033 | ||
1034 | ref_count = ext4_xattr_inode_get_ref(ea_inode); | |
1035 | ref_count += ref_change; | |
1036 | ext4_xattr_inode_set_ref(ea_inode, ref_count); | |
1037 | ||
1038 | if (ref_change > 0) { | |
1039 | WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", | |
1040 | ea_inode->i_ino, ref_count); | |
1041 | ||
1042 | if (ref_count == 1) { | |
1043 | WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", | |
1044 | ea_inode->i_ino, ea_inode->i_nlink); | |
1045 | ||
1046 | set_nlink(ea_inode, 1); | |
1047 | ext4_orphan_del(handle, ea_inode); | |
1048 | ||
cdb7ee4c TE |
1049 | if (ea_inode_cache) { |
1050 | hash = ext4_xattr_inode_get_hash(ea_inode); | |
1051 | mb_cache_entry_create(ea_inode_cache, | |
1052 | GFP_NOFS, hash, | |
1053 | ea_inode->i_ino, | |
1054 | true /* reusable */); | |
1055 | } | |
dec214d0 TE |
1056 | } |
1057 | } else { | |
1058 | WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", | |
1059 | ea_inode->i_ino, ref_count); | |
1060 | ||
1061 | if (ref_count == 0) { | |
1062 | WARN_ONCE(ea_inode->i_nlink != 1, | |
1063 | "EA inode %lu i_nlink=%u", | |
1064 | ea_inode->i_ino, ea_inode->i_nlink); | |
1065 | ||
1066 | clear_nlink(ea_inode); | |
1067 | ext4_orphan_add(handle, ea_inode); | |
1068 | ||
cdb7ee4c TE |
1069 | if (ea_inode_cache) { |
1070 | hash = ext4_xattr_inode_get_hash(ea_inode); | |
1071 | mb_cache_entry_delete(ea_inode_cache, hash, | |
1072 | ea_inode->i_ino); | |
1073 | } | |
dec214d0 TE |
1074 | } |
1075 | } | |
1076 | ||
1077 | ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); | |
1078 | iloc.bh = NULL; | |
1079 | if (ret) | |
1080 | ext4_warning_inode(ea_inode, | |
1081 | "ext4_mark_iloc_dirty() failed ret=%d", ret); | |
1082 | out: | |
1083 | brelse(iloc.bh); | |
1084 | inode_unlock(ea_inode); | |
1085 | return ret; | |
1086 | } | |
1087 | ||
1088 | static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) | |
1089 | { | |
1090 | return ext4_xattr_inode_update_ref(handle, ea_inode, 1); | |
1091 | } | |
1092 | ||
1093 | static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) | |
1094 | { | |
1095 | return ext4_xattr_inode_update_ref(handle, ea_inode, -1); | |
1096 | } | |
1097 | ||
1098 | static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, | |
1099 | struct ext4_xattr_entry *first) | |
1100 | { | |
1101 | struct inode *ea_inode; | |
1102 | struct ext4_xattr_entry *entry; | |
1103 | struct ext4_xattr_entry *failed_entry; | |
1104 | unsigned int ea_ino; | |
1105 | int err, saved_err; | |
1106 | ||
1107 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1108 | entry = EXT4_XATTR_NEXT(entry)) { | |
1109 | if (!entry->e_value_inum) | |
1110 | continue; | |
1111 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1112 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1113 | le32_to_cpu(entry->e_hash), | |
1114 | &ea_inode); | |
dec214d0 TE |
1115 | if (err) |
1116 | goto cleanup; | |
1117 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1118 | if (err) { | |
1119 | ext4_warning_inode(ea_inode, "inc ref error %d", err); | |
1120 | iput(ea_inode); | |
1121 | goto cleanup; | |
1122 | } | |
1123 | iput(ea_inode); | |
1124 | } | |
1125 | return 0; | |
1126 | ||
1127 | cleanup: | |
1128 | saved_err = err; | |
1129 | failed_entry = entry; | |
1130 | ||
1131 | for (entry = first; entry != failed_entry; | |
1132 | entry = EXT4_XATTR_NEXT(entry)) { | |
1133 | if (!entry->e_value_inum) | |
1134 | continue; | |
1135 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1136 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1137 | le32_to_cpu(entry->e_hash), | |
1138 | &ea_inode); | |
dec214d0 TE |
1139 | if (err) { |
1140 | ext4_warning(parent->i_sb, | |
1141 | "cleanup ea_ino %u iget error %d", ea_ino, | |
1142 | err); | |
1143 | continue; | |
1144 | } | |
1145 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1146 | if (err) | |
1147 | ext4_warning_inode(ea_inode, "cleanup dec ref error %d", | |
1148 | err); | |
1149 | iput(ea_inode); | |
1150 | } | |
1151 | return saved_err; | |
1152 | } | |
1153 | ||
30a7eb97 | 1154 | static void |
dec214d0 TE |
1155 | ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, |
1156 | struct buffer_head *bh, | |
1157 | struct ext4_xattr_entry *first, bool block_csum, | |
1158 | struct ext4_xattr_inode_array **ea_inode_array, | |
1159 | int extra_credits, bool skip_quota) | |
30a7eb97 TE |
1160 | { |
1161 | struct inode *ea_inode; | |
1162 | struct ext4_xattr_entry *entry; | |
1163 | bool dirty = false; | |
1164 | unsigned int ea_ino; | |
1165 | int err; | |
1166 | int credits; | |
1167 | ||
1168 | /* One credit for dec ref on ea_inode, one for orphan list addition, */ | |
1169 | credits = 2 + extra_credits; | |
1170 | ||
1171 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1172 | entry = EXT4_XATTR_NEXT(entry)) { | |
1173 | if (!entry->e_value_inum) | |
1174 | continue; | |
1175 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1176 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1177 | le32_to_cpu(entry->e_hash), | |
1178 | &ea_inode); | |
30a7eb97 TE |
1179 | if (err) |
1180 | continue; | |
1181 | ||
1182 | err = ext4_expand_inode_array(ea_inode_array, ea_inode); | |
1183 | if (err) { | |
1184 | ext4_warning_inode(ea_inode, | |
1185 | "Expand inode array err=%d", err); | |
1186 | iput(ea_inode); | |
1187 | continue; | |
1188 | } | |
1189 | ||
1190 | err = ext4_xattr_ensure_credits(handle, parent, credits, bh, | |
1191 | dirty, block_csum); | |
1192 | if (err) { | |
1193 | ext4_warning_inode(ea_inode, "Ensure credits err=%d", | |
1194 | err); | |
1195 | continue; | |
1196 | } | |
1197 | ||
dec214d0 TE |
1198 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); |
1199 | if (err) { | |
1200 | ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", | |
1201 | err); | |
1202 | continue; | |
1203 | } | |
1204 | ||
1205 | if (!skip_quota) | |
a6d05676 | 1206 | ext4_xattr_inode_free_quota(parent, ea_inode, |
dec214d0 | 1207 | le32_to_cpu(entry->e_value_size)); |
30a7eb97 TE |
1208 | |
1209 | /* | |
1210 | * Forget about ea_inode within the same transaction that | |
1211 | * decrements the ref count. This avoids duplicate decrements in | |
1212 | * case the rest of the work spills over to subsequent | |
1213 | * transactions. | |
1214 | */ | |
1215 | entry->e_value_inum = 0; | |
1216 | entry->e_value_size = 0; | |
1217 | ||
1218 | dirty = true; | |
1219 | } | |
1220 | ||
1221 | if (dirty) { | |
1222 | /* | |
1223 | * Note that we are deliberately skipping csum calculation for | |
1224 | * the final update because we do not expect any journal | |
1225 | * restarts until xattr block is freed. | |
1226 | */ | |
1227 | ||
1228 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
1229 | if (err) | |
1230 | ext4_warning_inode(parent, | |
1231 | "handle dirty metadata err=%d", err); | |
1232 | } | |
1233 | } | |
1234 | ||
ac27a0ec | 1235 | /* |
ec4cb1aa JK |
1236 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
1237 | * otherwise free the block. | |
ac27a0ec DK |
1238 | */ |
1239 | static void | |
617ba13b | 1240 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
dec214d0 TE |
1241 | struct buffer_head *bh, |
1242 | struct ext4_xattr_inode_array **ea_inode_array, | |
1243 | int extra_credits) | |
ac27a0ec | 1244 | { |
47387409 | 1245 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
6048c64b | 1246 | u32 hash, ref; |
8a2bfdcb | 1247 | int error = 0; |
ac27a0ec | 1248 | |
5d601255 | 1249 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
1250 | error = ext4_journal_get_write_access(handle, bh); |
1251 | if (error) | |
1252 | goto out; | |
1253 | ||
1254 | lock_buffer(bh); | |
6048c64b AG |
1255 | hash = le32_to_cpu(BHDR(bh)->h_hash); |
1256 | ref = le32_to_cpu(BHDR(bh)->h_refcount); | |
1257 | if (ref == 1) { | |
ac27a0ec | 1258 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
1259 | /* |
1260 | * This must happen under buffer lock for | |
1261 | * ext4_xattr_block_set() to reliably detect freed block | |
1262 | */ | |
cdb7ee4c TE |
1263 | if (ea_block_cache) |
1264 | mb_cache_entry_delete(ea_block_cache, hash, | |
1265 | bh->b_blocknr); | |
ac27a0ec | 1266 | get_bh(bh); |
ec4cb1aa | 1267 | unlock_buffer(bh); |
dec214d0 TE |
1268 | |
1269 | if (ext4_has_feature_ea_inode(inode->i_sb)) | |
1270 | ext4_xattr_inode_dec_ref_all(handle, inode, bh, | |
1271 | BFIRST(bh), | |
1272 | true /* block_csum */, | |
1273 | ea_inode_array, | |
1274 | extra_credits, | |
1275 | true /* skip_quota */); | |
e6362609 TT |
1276 | ext4_free_blocks(handle, inode, bh, 0, 1, |
1277 | EXT4_FREE_BLOCKS_METADATA | | |
1278 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 1279 | } else { |
6048c64b AG |
1280 | ref--; |
1281 | BHDR(bh)->h_refcount = cpu_to_le32(ref); | |
1282 | if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { | |
1283 | struct mb_cache_entry *ce; | |
1284 | ||
cdb7ee4c TE |
1285 | if (ea_block_cache) { |
1286 | ce = mb_cache_entry_get(ea_block_cache, hash, | |
1287 | bh->b_blocknr); | |
1288 | if (ce) { | |
1289 | ce->e_reusable = 1; | |
1290 | mb_cache_entry_put(ea_block_cache, ce); | |
1291 | } | |
6048c64b AG |
1292 | } |
1293 | } | |
1294 | ||
dac7a4b4 | 1295 | ext4_xattr_block_csum_set(inode, bh); |
ec4cb1aa JK |
1296 | /* |
1297 | * Beware of this ugliness: Releasing of xattr block references | |
1298 | * from different inodes can race and so we have to protect | |
1299 | * from a race where someone else frees the block (and releases | |
1300 | * its journal_head) before we are done dirtying the buffer. In | |
1301 | * nojournal mode this race is harmless and we actually cannot | |
dac7a4b4 | 1302 | * call ext4_handle_dirty_metadata() with locked buffer as |
ec4cb1aa JK |
1303 | * that function can call sync_dirty_buffer() so for that case |
1304 | * we handle the dirtying after unlocking the buffer. | |
1305 | */ | |
1306 | if (ext4_handle_valid(handle)) | |
dac7a4b4 | 1307 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
c1bb05a6 | 1308 | unlock_buffer(bh); |
ec4cb1aa | 1309 | if (!ext4_handle_valid(handle)) |
dac7a4b4 | 1310 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
8a2bfdcb | 1311 | if (IS_SYNC(inode)) |
0390131b | 1312 | ext4_handle_sync(handle); |
1231b3a1 | 1313 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
1314 | ea_bdebug(bh, "refcount now=%d; releasing", |
1315 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 1316 | } |
8a2bfdcb MC |
1317 | out: |
1318 | ext4_std_error(inode->i_sb, error); | |
1319 | return; | |
ac27a0ec DK |
1320 | } |
1321 | ||
6dd4ee7c KS |
1322 | /* |
1323 | * Find the available free space for EAs. This also returns the total number of | |
1324 | * bytes used by EA entries. | |
1325 | */ | |
1326 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
1327 | size_t *min_offs, void *base, int *total) | |
1328 | { | |
1329 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 1330 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
1331 | size_t offs = le16_to_cpu(last->e_value_offs); |
1332 | if (offs < *min_offs) | |
1333 | *min_offs = offs; | |
1334 | } | |
7b1b2c1b TT |
1335 | if (total) |
1336 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
1337 | } |
1338 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
1339 | } | |
1340 | ||
e50e5129 AD |
1341 | /* |
1342 | * Write the value of the EA in an inode. | |
1343 | */ | |
1344 | static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, | |
1345 | const void *buf, int bufsize) | |
1346 | { | |
1347 | struct buffer_head *bh = NULL; | |
1348 | unsigned long block = 0; | |
dec214d0 TE |
1349 | int blocksize = ea_inode->i_sb->s_blocksize; |
1350 | int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; | |
e50e5129 AD |
1351 | int csize, wsize = 0; |
1352 | int ret = 0; | |
1353 | int retries = 0; | |
1354 | ||
1355 | retry: | |
1356 | while (ret >= 0 && ret < max_blocks) { | |
1357 | struct ext4_map_blocks map; | |
1358 | map.m_lblk = block += ret; | |
1359 | map.m_len = max_blocks -= ret; | |
1360 | ||
1361 | ret = ext4_map_blocks(handle, ea_inode, &map, | |
1362 | EXT4_GET_BLOCKS_CREATE); | |
1363 | if (ret <= 0) { | |
1364 | ext4_mark_inode_dirty(handle, ea_inode); | |
1365 | if (ret == -ENOSPC && | |
1366 | ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { | |
1367 | ret = 0; | |
1368 | goto retry; | |
1369 | } | |
1370 | break; | |
1371 | } | |
1372 | } | |
1373 | ||
1374 | if (ret < 0) | |
1375 | return ret; | |
1376 | ||
1377 | block = 0; | |
1378 | while (wsize < bufsize) { | |
1379 | if (bh != NULL) | |
1380 | brelse(bh); | |
1381 | csize = (bufsize - wsize) > blocksize ? blocksize : | |
1382 | bufsize - wsize; | |
1383 | bh = ext4_getblk(handle, ea_inode, block, 0); | |
1384 | if (IS_ERR(bh)) | |
1385 | return PTR_ERR(bh); | |
dd277533 VA |
1386 | if (!bh) { |
1387 | WARN_ON_ONCE(1); | |
1388 | EXT4_ERROR_INODE(ea_inode, | |
1389 | "ext4_getblk() return bh = NULL"); | |
1390 | return -EFSCORRUPTED; | |
1391 | } | |
e50e5129 AD |
1392 | ret = ext4_journal_get_write_access(handle, bh); |
1393 | if (ret) | |
1394 | goto out; | |
1395 | ||
1396 | memcpy(bh->b_data, buf, csize); | |
1397 | set_buffer_uptodate(bh); | |
1398 | ext4_handle_dirty_metadata(handle, ea_inode, bh); | |
1399 | ||
1400 | buf += csize; | |
1401 | wsize += csize; | |
1402 | block += 1; | |
1403 | } | |
1404 | ||
1405 | inode_lock(ea_inode); | |
1406 | i_size_write(ea_inode, wsize); | |
1407 | ext4_update_i_disksize(ea_inode, wsize); | |
1408 | inode_unlock(ea_inode); | |
1409 | ||
1410 | ext4_mark_inode_dirty(handle, ea_inode); | |
1411 | ||
1412 | out: | |
1413 | brelse(bh); | |
1414 | ||
1415 | return ret; | |
1416 | } | |
1417 | ||
1418 | /* | |
1419 | * Create an inode to store the value of a large EA. | |
1420 | */ | |
1421 | static struct inode *ext4_xattr_inode_create(handle_t *handle, | |
dec214d0 | 1422 | struct inode *inode, u32 hash) |
e50e5129 AD |
1423 | { |
1424 | struct inode *ea_inode = NULL; | |
9e1ba001 | 1425 | uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; |
bd3b963b | 1426 | int err; |
e50e5129 AD |
1427 | |
1428 | /* | |
1429 | * Let the next inode be the goal, so we try and allocate the EA inode | |
1430 | * in the same group, or nearby one. | |
1431 | */ | |
1432 | ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, | |
9e1ba001 | 1433 | S_IFREG | 0600, NULL, inode->i_ino + 1, owner, |
1b917ed8 | 1434 | EXT4_EA_INODE_FL); |
e50e5129 AD |
1435 | if (!IS_ERR(ea_inode)) { |
1436 | ea_inode->i_op = &ext4_file_inode_operations; | |
1437 | ea_inode->i_fop = &ext4_file_operations; | |
1438 | ext4_set_aops(ea_inode); | |
33d201e0 | 1439 | ext4_xattr_inode_set_class(ea_inode); |
e50e5129 | 1440 | unlock_new_inode(ea_inode); |
dec214d0 TE |
1441 | ext4_xattr_inode_set_ref(ea_inode, 1); |
1442 | ext4_xattr_inode_set_hash(ea_inode, hash); | |
1443 | err = ext4_mark_inode_dirty(handle, ea_inode); | |
1444 | if (!err) | |
1445 | err = ext4_inode_attach_jinode(ea_inode); | |
bd3b963b TE |
1446 | if (err) { |
1447 | iput(ea_inode); | |
1448 | return ERR_PTR(err); | |
1449 | } | |
dec214d0 TE |
1450 | |
1451 | /* | |
1452 | * Xattr inodes are shared therefore quota charging is performed | |
1453 | * at a higher level. | |
1454 | */ | |
1455 | dquot_free_inode(ea_inode); | |
1456 | dquot_drop(ea_inode); | |
1457 | inode_lock(ea_inode); | |
1458 | ea_inode->i_flags |= S_NOQUOTA; | |
1459 | inode_unlock(ea_inode); | |
e50e5129 AD |
1460 | } |
1461 | ||
1462 | return ea_inode; | |
1463 | } | |
1464 | ||
dec214d0 TE |
1465 | static struct inode * |
1466 | ext4_xattr_inode_cache_find(struct inode *inode, const void *value, | |
1467 | size_t value_len, u32 hash) | |
e50e5129 | 1468 | { |
dec214d0 TE |
1469 | struct inode *ea_inode; |
1470 | struct mb_cache_entry *ce; | |
1471 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); | |
1472 | void *ea_data; | |
1473 | ||
cdb7ee4c TE |
1474 | if (!ea_inode_cache) |
1475 | return NULL; | |
1476 | ||
dec214d0 TE |
1477 | ce = mb_cache_entry_find_first(ea_inode_cache, hash); |
1478 | if (!ce) | |
1479 | return NULL; | |
1480 | ||
1481 | ea_data = ext4_kvmalloc(value_len, GFP_NOFS); | |
1482 | if (!ea_data) { | |
1483 | mb_cache_entry_put(ea_inode_cache, ce); | |
1484 | return NULL; | |
1485 | } | |
e50e5129 | 1486 | |
dec214d0 TE |
1487 | while (ce) { |
1488 | ea_inode = ext4_iget(inode->i_sb, ce->e_value); | |
1489 | if (!IS_ERR(ea_inode) && | |
1490 | !is_bad_inode(ea_inode) && | |
1491 | (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && | |
1492 | i_size_read(ea_inode) == value_len && | |
1493 | !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && | |
b9fc761e TE |
1494 | !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, |
1495 | value_len) && | |
dec214d0 TE |
1496 | !memcmp(value, ea_data, value_len)) { |
1497 | mb_cache_entry_touch(ea_inode_cache, ce); | |
1498 | mb_cache_entry_put(ea_inode_cache, ce); | |
1499 | kvfree(ea_data); | |
1500 | return ea_inode; | |
1501 | } | |
e50e5129 | 1502 | |
dec214d0 TE |
1503 | if (!IS_ERR(ea_inode)) |
1504 | iput(ea_inode); | |
1505 | ce = mb_cache_entry_find_next(ea_inode_cache, ce); | |
1506 | } | |
1507 | kvfree(ea_data); | |
1508 | return NULL; | |
e50e5129 AD |
1509 | } |
1510 | ||
1511 | /* | |
1512 | * Add value of the EA in an inode. | |
1513 | */ | |
dec214d0 TE |
1514 | static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, |
1515 | const void *value, size_t value_len, | |
1516 | struct inode **ret_inode) | |
e50e5129 AD |
1517 | { |
1518 | struct inode *ea_inode; | |
dec214d0 | 1519 | u32 hash; |
e50e5129 AD |
1520 | int err; |
1521 | ||
dec214d0 TE |
1522 | hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); |
1523 | ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); | |
1524 | if (ea_inode) { | |
1525 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1526 | if (err) { | |
1527 | iput(ea_inode); | |
1528 | return err; | |
1529 | } | |
1530 | ||
1531 | *ret_inode = ea_inode; | |
1532 | return 0; | |
1533 | } | |
1534 | ||
e50e5129 | 1535 | /* Create an inode for the EA value */ |
dec214d0 | 1536 | ea_inode = ext4_xattr_inode_create(handle, inode, hash); |
e50e5129 AD |
1537 | if (IS_ERR(ea_inode)) |
1538 | return PTR_ERR(ea_inode); | |
1539 | ||
1540 | err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); | |
dec214d0 TE |
1541 | if (err) { |
1542 | ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1543 | iput(ea_inode); | |
1544 | return err; | |
1545 | } | |
e50e5129 | 1546 | |
cdb7ee4c TE |
1547 | if (EA_INODE_CACHE(inode)) |
1548 | mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, | |
1549 | ea_inode->i_ino, true /* reusable */); | |
e50e5129 | 1550 | |
dec214d0 TE |
1551 | *ret_inode = ea_inode; |
1552 | return 0; | |
e50e5129 AD |
1553 | } |
1554 | ||
9c6e7853 TE |
1555 | /* |
1556 | * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode | |
1557 | * feature is enabled. | |
1558 | */ | |
1559 | #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) | |
1560 | ||
e50e5129 AD |
1561 | static int ext4_xattr_set_entry(struct ext4_xattr_info *i, |
1562 | struct ext4_xattr_search *s, | |
daf83281 TE |
1563 | handle_t *handle, struct inode *inode, |
1564 | bool is_block) | |
ac27a0ec | 1565 | { |
0dc14823 | 1566 | struct ext4_xattr_entry *last, *next; |
dec214d0 TE |
1567 | struct ext4_xattr_entry *here = s->here; |
1568 | size_t min_offs = s->end - s->base, name_len = strlen(i->name); | |
e50e5129 | 1569 | int in_inode = i->in_inode; |
dec214d0 TE |
1570 | struct inode *old_ea_inode = NULL; |
1571 | struct inode *new_ea_inode = NULL; | |
1572 | size_t old_size, new_size; | |
1573 | int ret; | |
1574 | ||
1575 | /* Space used by old and new values. */ | |
1576 | old_size = (!s->not_found && !here->e_value_inum) ? | |
1577 | EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; | |
1578 | new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; | |
1579 | ||
1580 | /* | |
1581 | * Optimization for the simple case when old and new values have the | |
1582 | * same padded sizes. Not applicable if external inodes are involved. | |
1583 | */ | |
1584 | if (new_size && new_size == old_size) { | |
1585 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1586 | void *val = s->base + offs; | |
1587 | ||
1588 | here->e_value_size = cpu_to_le32(i->value_len); | |
1589 | if (i->value == EXT4_ZERO_XATTR_VALUE) { | |
1590 | memset(val, 0, new_size); | |
1591 | } else { | |
1592 | memcpy(val, i->value, i->value_len); | |
1593 | /* Clear padding bytes. */ | |
1594 | memset(val + i->value_len, 0, new_size - i->value_len); | |
1595 | } | |
32aaf194 | 1596 | goto update_hash; |
dec214d0 | 1597 | } |
e50e5129 | 1598 | |
ac27a0ec DK |
1599 | /* Compute min_offs and last. */ |
1600 | last = s->first; | |
0dc14823 TT |
1601 | for (; !IS_LAST_ENTRY(last); last = next) { |
1602 | next = EXT4_XATTR_NEXT(last); | |
1603 | if ((void *)next >= s->end) { | |
1604 | EXT4_ERROR_INODE(inode, "corrupted xattr entries"); | |
1605 | ret = -EFSCORRUPTED; | |
1606 | goto out; | |
1607 | } | |
e50e5129 | 1608 | if (!last->e_value_inum && last->e_value_size) { |
ac27a0ec DK |
1609 | size_t offs = le16_to_cpu(last->e_value_offs); |
1610 | if (offs < min_offs) | |
1611 | min_offs = offs; | |
1612 | } | |
1613 | } | |
dec214d0 TE |
1614 | |
1615 | /* Check whether we have enough space. */ | |
ac27a0ec | 1616 | if (i->value) { |
dec214d0 | 1617 | size_t free; |
e50e5129 | 1618 | |
dec214d0 TE |
1619 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); |
1620 | if (!s->not_found) | |
1621 | free += EXT4_XATTR_LEN(name_len) + old_size; | |
e50e5129 | 1622 | |
dec214d0 TE |
1623 | if (free < EXT4_XATTR_LEN(name_len) + new_size) { |
1624 | ret = -ENOSPC; | |
1625 | goto out; | |
1626 | } | |
9c6e7853 TE |
1627 | |
1628 | /* | |
1629 | * If storing the value in an external inode is an option, | |
1630 | * reserve space for xattr entries/names in the external | |
1631 | * attribute block so that a long value does not occupy the | |
1632 | * whole space and prevent futher entries being added. | |
1633 | */ | |
daf83281 TE |
1634 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
1635 | new_size && is_block && | |
9c6e7853 TE |
1636 | (min_offs + old_size - new_size) < |
1637 | EXT4_XATTR_BLOCK_RESERVE(inode)) { | |
1638 | ret = -ENOSPC; | |
1639 | goto out; | |
1640 | } | |
ac27a0ec DK |
1641 | } |
1642 | ||
dec214d0 TE |
1643 | /* |
1644 | * Getting access to old and new ea inodes is subject to failures. | |
1645 | * Finish that work before doing any modifications to the xattr data. | |
1646 | */ | |
1647 | if (!s->not_found && here->e_value_inum) { | |
1648 | ret = ext4_xattr_inode_iget(inode, | |
1649 | le32_to_cpu(here->e_value_inum), | |
a6d05676 | 1650 | le32_to_cpu(here->e_hash), |
dec214d0 TE |
1651 | &old_ea_inode); |
1652 | if (ret) { | |
1653 | old_ea_inode = NULL; | |
1654 | goto out; | |
1655 | } | |
1656 | } | |
1657 | if (i->value && in_inode) { | |
1658 | WARN_ON_ONCE(!i->value_len); | |
ac27a0ec | 1659 | |
dec214d0 TE |
1660 | ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); |
1661 | if (ret) | |
1662 | goto out; | |
1663 | ||
1664 | ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, | |
1665 | i->value_len, | |
1666 | &new_ea_inode); | |
1667 | if (ret) { | |
1668 | new_ea_inode = NULL; | |
a6d05676 | 1669 | ext4_xattr_inode_free_quota(inode, NULL, i->value_len); |
dec214d0 | 1670 | goto out; |
ac27a0ec | 1671 | } |
dec214d0 TE |
1672 | } |
1673 | ||
1674 | if (old_ea_inode) { | |
1675 | /* We are ready to release ref count on the old_ea_inode. */ | |
1676 | ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); | |
1677 | if (ret) { | |
1678 | /* Release newly required ref count on new_ea_inode. */ | |
1679 | if (new_ea_inode) { | |
1680 | int err; | |
1681 | ||
1682 | err = ext4_xattr_inode_dec_ref(handle, | |
1683 | new_ea_inode); | |
1684 | if (err) | |
1685 | ext4_warning_inode(new_ea_inode, | |
1686 | "dec ref new_ea_inode err=%d", | |
1687 | err); | |
a6d05676 | 1688 | ext4_xattr_inode_free_quota(inode, new_ea_inode, |
dec214d0 TE |
1689 | i->value_len); |
1690 | } | |
1691 | goto out; | |
e50e5129 | 1692 | } |
dec214d0 | 1693 | |
a6d05676 | 1694 | ext4_xattr_inode_free_quota(inode, old_ea_inode, |
dec214d0 TE |
1695 | le32_to_cpu(here->e_value_size)); |
1696 | } | |
1697 | ||
1698 | /* No failures allowed past this point. */ | |
1699 | ||
21542545 | 1700 | if (!s->not_found && here->e_value_size && here->e_value_offs) { |
dec214d0 TE |
1701 | /* Remove the old value. */ |
1702 | void *first_val = s->base + min_offs; | |
1703 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1704 | void *val = s->base + offs; | |
1705 | ||
1706 | memmove(first_val + old_size, first_val, val - first_val); | |
1707 | memset(first_val, 0, old_size); | |
1708 | min_offs += old_size; | |
1709 | ||
1710 | /* Adjust all value offsets. */ | |
1711 | last = s->first; | |
1712 | while (!IS_LAST_ENTRY(last)) { | |
1713 | size_t o = le16_to_cpu(last->e_value_offs); | |
1714 | ||
1715 | if (!last->e_value_inum && | |
1716 | last->e_value_size && o < offs) | |
1717 | last->e_value_offs = cpu_to_le16(o + old_size); | |
1718 | last = EXT4_XATTR_NEXT(last); | |
ac27a0ec DK |
1719 | } |
1720 | } | |
1721 | ||
dec214d0 TE |
1722 | if (!i->value) { |
1723 | /* Remove old name. */ | |
1724 | size_t size = EXT4_XATTR_LEN(name_len); | |
1725 | ||
1726 | last = ENTRY((void *)last - size); | |
1727 | memmove(here, (void *)here + size, | |
1728 | (void *)last - (void *)here + sizeof(__u32)); | |
1729 | memset(last, 0, size); | |
1730 | } else if (s->not_found) { | |
1731 | /* Insert new name. */ | |
1732 | size_t size = EXT4_XATTR_LEN(name_len); | |
1733 | size_t rest = (void *)last - (void *)here + sizeof(__u32); | |
1734 | ||
1735 | memmove((void *)here + size, here, rest); | |
1736 | memset(here, 0, size); | |
1737 | here->e_name_index = i->name_index; | |
1738 | here->e_name_len = name_len; | |
1739 | memcpy(here->e_name, i->name, name_len); | |
1740 | } else { | |
1741 | /* This is an update, reset value info. */ | |
1742 | here->e_value_inum = 0; | |
1743 | here->e_value_offs = 0; | |
1744 | here->e_value_size = 0; | |
1745 | } | |
1746 | ||
ac27a0ec | 1747 | if (i->value) { |
dec214d0 | 1748 | /* Insert new value. */ |
e50e5129 | 1749 | if (in_inode) { |
dec214d0 | 1750 | here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); |
e50e5129 | 1751 | } else if (i->value_len) { |
dec214d0 TE |
1752 | void *val = s->base + min_offs - new_size; |
1753 | ||
1754 | here->e_value_offs = cpu_to_le16(min_offs - new_size); | |
bd9926e8 | 1755 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
dec214d0 | 1756 | memset(val, 0, new_size); |
bd9926e8 | 1757 | } else { |
bd9926e8 | 1758 | memcpy(val, i->value, i->value_len); |
dec214d0 TE |
1759 | /* Clear padding bytes. */ |
1760 | memset(val + i->value_len, 0, | |
1761 | new_size - i->value_len); | |
bd9926e8 | 1762 | } |
ac27a0ec | 1763 | } |
dec214d0 | 1764 | here->e_value_size = cpu_to_le32(i->value_len); |
ac27a0ec | 1765 | } |
daf83281 | 1766 | |
32aaf194 | 1767 | update_hash: |
b9fc761e TE |
1768 | if (i->value) { |
1769 | __le32 hash = 0; | |
1770 | ||
1771 | /* Entry hash calculation. */ | |
1772 | if (in_inode) { | |
1773 | __le32 crc32c_hash; | |
1774 | ||
1775 | /* | |
1776 | * Feed crc32c hash instead of the raw value for entry | |
1777 | * hash calculation. This is to avoid walking | |
1778 | * potentially long value buffer again. | |
1779 | */ | |
1780 | crc32c_hash = cpu_to_le32( | |
1781 | ext4_xattr_inode_get_hash(new_ea_inode)); | |
1782 | hash = ext4_xattr_hash_entry(here->e_name, | |
1783 | here->e_name_len, | |
1784 | &crc32c_hash, 1); | |
1785 | } else if (is_block) { | |
32aaf194 TE |
1786 | __le32 *value = s->base + le16_to_cpu( |
1787 | here->e_value_offs); | |
b9fc761e TE |
1788 | |
1789 | hash = ext4_xattr_hash_entry(here->e_name, | |
1790 | here->e_name_len, value, | |
1791 | new_size >> 2); | |
1792 | } | |
1793 | here->e_hash = hash; | |
daf83281 TE |
1794 | } |
1795 | ||
b9fc761e TE |
1796 | if (is_block) |
1797 | ext4_xattr_rehash((struct ext4_xattr_header *)s->base); | |
1798 | ||
dec214d0 | 1799 | ret = 0; |
e50e5129 | 1800 | out: |
dec214d0 TE |
1801 | iput(old_ea_inode); |
1802 | iput(new_ea_inode); | |
1803 | return ret; | |
ac27a0ec DK |
1804 | } |
1805 | ||
617ba13b MC |
1806 | struct ext4_xattr_block_find { |
1807 | struct ext4_xattr_search s; | |
ac27a0ec DK |
1808 | struct buffer_head *bh; |
1809 | }; | |
1810 | ||
1811 | static int | |
617ba13b MC |
1812 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
1813 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1814 | { |
1815 | struct super_block *sb = inode->i_sb; | |
1816 | int error; | |
1817 | ||
1818 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
1819 | i->name_index, i->name, i->value, (long)i->value_len); | |
1820 | ||
617ba13b | 1821 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 1822 | /* The inode already has an extended attribute block. */ |
9da1f6d0 TT |
1823 | bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
1824 | if (IS_ERR(bs->bh)) | |
1825 | return PTR_ERR(bs->bh); | |
ac27a0ec DK |
1826 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", |
1827 | atomic_read(&(bs->bh->b_count)), | |
1828 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
598e04ae TT |
1829 | error = ext4_xattr_check_block(inode, bs->bh); |
1830 | if (error) | |
9da1f6d0 | 1831 | return error; |
ac27a0ec DK |
1832 | /* Find the named attribute. */ |
1833 | bs->s.base = BHDR(bs->bh); | |
1834 | bs->s.first = BFIRST(bs->bh); | |
1835 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
1836 | bs->s.here = bs->s.first; | |
97039521 TT |
1837 | error = xattr_find_entry(inode, &bs->s.here, bs->s.end, |
1838 | i->name_index, i->name, 1); | |
ac27a0ec | 1839 | if (error && error != -ENODATA) |
9da1f6d0 | 1840 | return error; |
ac27a0ec DK |
1841 | bs->s.not_found = error; |
1842 | } | |
9da1f6d0 | 1843 | return 0; |
ac27a0ec DK |
1844 | } |
1845 | ||
1846 | static int | |
617ba13b MC |
1847 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
1848 | struct ext4_xattr_info *i, | |
1849 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1850 | { |
1851 | struct super_block *sb = inode->i_sb; | |
1852 | struct buffer_head *new_bh = NULL; | |
b347e2bc TE |
1853 | struct ext4_xattr_search s_copy = bs->s; |
1854 | struct ext4_xattr_search *s = &s_copy; | |
7a2508e1 | 1855 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 1856 | int error = 0; |
47387409 | 1857 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
a6d05676 TE |
1858 | struct inode *ea_inode = NULL, *tmp_inode; |
1859 | size_t old_ea_inode_quota = 0; | |
1860 | unsigned int ea_ino; | |
1861 | ||
ac27a0ec | 1862 | |
617ba13b | 1863 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec | 1864 | |
ac27a0ec | 1865 | if (s->base) { |
5d601255 | 1866 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
1867 | error = ext4_journal_get_write_access(handle, bs->bh); |
1868 | if (error) | |
1869 | goto cleanup; | |
1870 | lock_buffer(bs->bh); | |
1871 | ||
ac27a0ec | 1872 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
1873 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
1874 | ||
1875 | /* | |
1876 | * This must happen under buffer lock for | |
1877 | * ext4_xattr_block_set() to reliably detect modified | |
1878 | * block | |
1879 | */ | |
cdb7ee4c TE |
1880 | if (ea_block_cache) |
1881 | mb_cache_entry_delete(ea_block_cache, hash, | |
1882 | bs->bh->b_blocknr); | |
ac27a0ec | 1883 | ea_bdebug(bs->bh, "modifying in-place"); |
daf83281 TE |
1884 | error = ext4_xattr_set_entry(i, s, handle, inode, |
1885 | true /* is_block */); | |
dac7a4b4 | 1886 | ext4_xattr_block_csum_set(inode, bs->bh); |
ac27a0ec | 1887 | unlock_buffer(bs->bh); |
6a797d27 | 1888 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1889 | goto bad_block; |
1890 | if (!error) | |
dac7a4b4 TT |
1891 | error = ext4_handle_dirty_metadata(handle, |
1892 | inode, | |
1893 | bs->bh); | |
ac27a0ec DK |
1894 | if (error) |
1895 | goto cleanup; | |
1896 | goto inserted; | |
1897 | } else { | |
1898 | int offset = (char *)s->here - bs->bh->b_data; | |
1899 | ||
8a2bfdcb | 1900 | unlock_buffer(bs->bh); |
ac27a0ec | 1901 | ea_bdebug(bs->bh, "cloning"); |
216553c4 | 1902 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
1903 | error = -ENOMEM; |
1904 | if (s->base == NULL) | |
1905 | goto cleanup; | |
1906 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
1907 | s->first = ENTRY(header(s->base)+1); | |
1908 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1909 | s->here = ENTRY(s->base + offset); | |
1910 | s->end = s->base + bs->bh->b_size; | |
dec214d0 TE |
1911 | |
1912 | /* | |
1913 | * If existing entry points to an xattr inode, we need | |
1914 | * to prevent ext4_xattr_set_entry() from decrementing | |
1915 | * ref count on it because the reference belongs to the | |
1916 | * original block. In this case, make the entry look | |
1917 | * like it has an empty value. | |
1918 | */ | |
1919 | if (!s->not_found && s->here->e_value_inum) { | |
a6d05676 TE |
1920 | ea_ino = le32_to_cpu(s->here->e_value_inum); |
1921 | error = ext4_xattr_inode_iget(inode, ea_ino, | |
1922 | le32_to_cpu(s->here->e_hash), | |
1923 | &tmp_inode); | |
1924 | if (error) | |
1925 | goto cleanup; | |
1926 | ||
1927 | if (!ext4_test_inode_state(tmp_inode, | |
1928 | EXT4_STATE_LUSTRE_EA_INODE)) { | |
1929 | /* | |
1930 | * Defer quota free call for previous | |
1931 | * inode until success is guaranteed. | |
1932 | */ | |
1933 | old_ea_inode_quota = le32_to_cpu( | |
dec214d0 | 1934 | s->here->e_value_size); |
a6d05676 TE |
1935 | } |
1936 | iput(tmp_inode); | |
1937 | ||
dec214d0 TE |
1938 | s->here->e_value_inum = 0; |
1939 | s->here->e_value_size = 0; | |
1940 | } | |
ac27a0ec DK |
1941 | } |
1942 | } else { | |
1943 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 1944 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
1945 | /* assert(header == s->base) */ |
1946 | error = -ENOMEM; | |
1947 | if (s->base == NULL) | |
1948 | goto cleanup; | |
617ba13b | 1949 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
1950 | header(s->base)->h_blocks = cpu_to_le32(1); |
1951 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1952 | s->first = ENTRY(header(s->base)+1); | |
1953 | s->here = ENTRY(header(s->base)+1); | |
1954 | s->end = s->base + sb->s_blocksize; | |
1955 | } | |
1956 | ||
daf83281 | 1957 | error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); |
6a797d27 | 1958 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1959 | goto bad_block; |
1960 | if (error) | |
1961 | goto cleanup; | |
dec214d0 TE |
1962 | |
1963 | if (i->value && s->here->e_value_inum) { | |
dec214d0 TE |
1964 | /* |
1965 | * A ref count on ea_inode has been taken as part of the call to | |
1966 | * ext4_xattr_set_entry() above. We would like to drop this | |
1967 | * extra ref but we have to wait until the xattr block is | |
1968 | * initialized and has its own ref count on the ea_inode. | |
1969 | */ | |
1970 | ea_ino = le32_to_cpu(s->here->e_value_inum); | |
a6d05676 TE |
1971 | error = ext4_xattr_inode_iget(inode, ea_ino, |
1972 | le32_to_cpu(s->here->e_hash), | |
1973 | &ea_inode); | |
dec214d0 TE |
1974 | if (error) { |
1975 | ea_inode = NULL; | |
1976 | goto cleanup; | |
1977 | } | |
1978 | } | |
1979 | ||
ac27a0ec DK |
1980 | inserted: |
1981 | if (!IS_LAST_ENTRY(s->first)) { | |
47387409 TE |
1982 | new_bh = ext4_xattr_block_cache_find(inode, header(s->base), |
1983 | &ce); | |
ac27a0ec DK |
1984 | if (new_bh) { |
1985 | /* We found an identical block in the cache. */ | |
1986 | if (new_bh == bs->bh) | |
1987 | ea_bdebug(new_bh, "keeping"); | |
1988 | else { | |
6048c64b AG |
1989 | u32 ref; |
1990 | ||
b8cb5a54 TE |
1991 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
1992 | ||
ac27a0ec DK |
1993 | /* The old block is released after updating |
1994 | the inode. */ | |
1231b3a1 LC |
1995 | error = dquot_alloc_block(inode, |
1996 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 1997 | if (error) |
ac27a0ec | 1998 | goto cleanup; |
5d601255 | 1999 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 2000 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
2001 | new_bh); |
2002 | if (error) | |
2003 | goto cleanup_dquot; | |
2004 | lock_buffer(new_bh); | |
82939d79 JK |
2005 | /* |
2006 | * We have to be careful about races with | |
6048c64b AG |
2007 | * freeing, rehashing or adding references to |
2008 | * xattr block. Once we hold buffer lock xattr | |
2009 | * block's state is stable so we can check | |
2010 | * whether the block got freed / rehashed or | |
2011 | * not. Since we unhash mbcache entry under | |
2012 | * buffer lock when freeing / rehashing xattr | |
2013 | * block, checking whether entry is still | |
2014 | * hashed is reliable. Same rules hold for | |
2015 | * e_reusable handling. | |
82939d79 | 2016 | */ |
6048c64b AG |
2017 | if (hlist_bl_unhashed(&ce->e_hash_list) || |
2018 | !ce->e_reusable) { | |
82939d79 JK |
2019 | /* |
2020 | * Undo everything and check mbcache | |
2021 | * again. | |
2022 | */ | |
2023 | unlock_buffer(new_bh); | |
2024 | dquot_free_block(inode, | |
2025 | EXT4_C2B(EXT4_SB(sb), | |
2026 | 1)); | |
2027 | brelse(new_bh); | |
47387409 | 2028 | mb_cache_entry_put(ea_block_cache, ce); |
82939d79 JK |
2029 | ce = NULL; |
2030 | new_bh = NULL; | |
2031 | goto inserted; | |
2032 | } | |
6048c64b AG |
2033 | ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
2034 | BHDR(new_bh)->h_refcount = cpu_to_le32(ref); | |
2035 | if (ref >= EXT4_XATTR_REFCOUNT_MAX) | |
2036 | ce->e_reusable = 0; | |
ac27a0ec | 2037 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
6048c64b | 2038 | ref); |
dac7a4b4 | 2039 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec | 2040 | unlock_buffer(new_bh); |
dac7a4b4 TT |
2041 | error = ext4_handle_dirty_metadata(handle, |
2042 | inode, | |
2043 | new_bh); | |
ac27a0ec DK |
2044 | if (error) |
2045 | goto cleanup_dquot; | |
2046 | } | |
47387409 TE |
2047 | mb_cache_entry_touch(ea_block_cache, ce); |
2048 | mb_cache_entry_put(ea_block_cache, ce); | |
ac27a0ec DK |
2049 | ce = NULL; |
2050 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
2051 | /* We were modifying this block in-place. */ | |
2052 | ea_bdebug(bs->bh, "keeping this block"); | |
ec000220 | 2053 | ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); |
ac27a0ec DK |
2054 | new_bh = bs->bh; |
2055 | get_bh(new_bh); | |
2056 | } else { | |
2057 | /* We need to allocate a new block */ | |
fb0a387d ES |
2058 | ext4_fsblk_t goal, block; |
2059 | ||
b8cb5a54 TE |
2060 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
2061 | ||
fb0a387d | 2062 | goal = ext4_group_first_block_no(sb, |
d00a6d7b | 2063 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
2064 | |
2065 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 2066 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2067 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
2068 | ||
55f020db AH |
2069 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
2070 | NULL, &error); | |
ac27a0ec DK |
2071 | if (error) |
2072 | goto cleanup; | |
fb0a387d | 2073 | |
12e9b892 | 2074 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2075 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
2076 | ||
ace36ad4 JP |
2077 | ea_idebug(inode, "creating block %llu", |
2078 | (unsigned long long)block); | |
ac27a0ec DK |
2079 | |
2080 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 2081 | if (unlikely(!new_bh)) { |
860d21e2 | 2082 | error = -ENOMEM; |
ac27a0ec | 2083 | getblk_failed: |
7dc57615 | 2084 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 2085 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
2086 | goto cleanup; |
2087 | } | |
dec214d0 TE |
2088 | error = ext4_xattr_inode_inc_ref_all(handle, inode, |
2089 | ENTRY(header(s->base)+1)); | |
2090 | if (error) | |
2091 | goto getblk_failed; | |
2092 | if (ea_inode) { | |
2093 | /* Drop the extra ref on ea_inode. */ | |
2094 | error = ext4_xattr_inode_dec_ref(handle, | |
2095 | ea_inode); | |
2096 | if (error) | |
2097 | ext4_warning_inode(ea_inode, | |
2098 | "dec ref error=%d", | |
2099 | error); | |
2100 | iput(ea_inode); | |
2101 | ea_inode = NULL; | |
2102 | } | |
2103 | ||
ac27a0ec | 2104 | lock_buffer(new_bh); |
617ba13b | 2105 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
2106 | if (error) { |
2107 | unlock_buffer(new_bh); | |
860d21e2 | 2108 | error = -EIO; |
ac27a0ec DK |
2109 | goto getblk_failed; |
2110 | } | |
2111 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
dac7a4b4 | 2112 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec DK |
2113 | set_buffer_uptodate(new_bh); |
2114 | unlock_buffer(new_bh); | |
47387409 | 2115 | ext4_xattr_block_cache_insert(ea_block_cache, new_bh); |
dac7a4b4 TT |
2116 | error = ext4_handle_dirty_metadata(handle, inode, |
2117 | new_bh); | |
ac27a0ec DK |
2118 | if (error) |
2119 | goto cleanup; | |
2120 | } | |
2121 | } | |
2122 | ||
a6d05676 TE |
2123 | if (old_ea_inode_quota) |
2124 | ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); | |
dec214d0 | 2125 | |
ac27a0ec | 2126 | /* Update the inode. */ |
617ba13b | 2127 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
2128 | |
2129 | /* Drop the previous xattr block. */ | |
dec214d0 TE |
2130 | if (bs->bh && bs->bh != new_bh) { |
2131 | struct ext4_xattr_inode_array *ea_inode_array = NULL; | |
2132 | ||
2133 | ext4_xattr_release_block(handle, inode, bs->bh, | |
2134 | &ea_inode_array, | |
2135 | 0 /* extra_credits */); | |
2136 | ext4_xattr_inode_array_free(ea_inode_array); | |
2137 | } | |
ac27a0ec DK |
2138 | error = 0; |
2139 | ||
2140 | cleanup: | |
dec214d0 TE |
2141 | if (ea_inode) { |
2142 | int error2; | |
2143 | ||
2144 | error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
2145 | if (error2) | |
2146 | ext4_warning_inode(ea_inode, "dec ref error=%d", | |
2147 | error2); | |
2148 | ||
2149 | /* If there was an error, revert the quota charge. */ | |
2150 | if (error) | |
a6d05676 | 2151 | ext4_xattr_inode_free_quota(inode, ea_inode, |
dec214d0 TE |
2152 | i_size_read(ea_inode)); |
2153 | iput(ea_inode); | |
2154 | } | |
ac27a0ec | 2155 | if (ce) |
47387409 | 2156 | mb_cache_entry_put(ea_block_cache, ce); |
ac27a0ec DK |
2157 | brelse(new_bh); |
2158 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
2159 | kfree(s->base); | |
2160 | ||
2161 | return error; | |
2162 | ||
2163 | cleanup_dquot: | |
1231b3a1 | 2164 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
2165 | goto cleanup; |
2166 | ||
2167 | bad_block: | |
24676da4 TT |
2168 | EXT4_ERROR_INODE(inode, "bad block %llu", |
2169 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
2170 | goto cleanup; |
2171 | ||
2172 | #undef header | |
2173 | } | |
2174 | ||
879b3825 TM |
2175 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
2176 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2177 | { |
617ba13b MC |
2178 | struct ext4_xattr_ibody_header *header; |
2179 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
2180 | int error; |
2181 | ||
617ba13b | 2182 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 2183 | return 0; |
617ba13b | 2184 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
2185 | header = IHDR(inode, raw_inode); |
2186 | is->s.base = is->s.first = IFIRST(header); | |
2187 | is->s.here = is->s.first; | |
617ba13b | 2188 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 2189 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
9e92f48c | 2190 | error = xattr_check_inode(inode, header, is->s.end); |
ac27a0ec DK |
2191 | if (error) |
2192 | return error; | |
2193 | /* Find the named attribute. */ | |
97039521 TT |
2194 | error = xattr_find_entry(inode, &is->s.here, is->s.end, |
2195 | i->name_index, i->name, 0); | |
ac27a0ec DK |
2196 | if (error && error != -ENODATA) |
2197 | return error; | |
2198 | is->s.not_found = error; | |
2199 | } | |
2200 | return 0; | |
2201 | } | |
2202 | ||
0d812f77 TM |
2203 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
2204 | struct ext4_xattr_info *i, | |
2205 | struct ext4_xattr_ibody_find *is) | |
2206 | { | |
2207 | struct ext4_xattr_ibody_header *header; | |
2208 | struct ext4_xattr_search *s = &is->s; | |
2209 | int error; | |
2210 | ||
2211 | if (EXT4_I(inode)->i_extra_isize == 0) | |
2212 | return -ENOSPC; | |
daf83281 | 2213 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
02945e49 TT |
2214 | if (error) |
2215 | return error; | |
0d812f77 TM |
2216 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
2217 | if (!IS_LAST_ENTRY(s->first)) { | |
2218 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); | |
2219 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); | |
2220 | } else { | |
2221 | header->h_magic = cpu_to_le32(0); | |
2222 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); | |
2223 | } | |
2224 | return 0; | |
2225 | } | |
2226 | ||
e50e5129 | 2227 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, |
0d812f77 TM |
2228 | struct ext4_xattr_info *i, |
2229 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2230 | { |
617ba13b MC |
2231 | struct ext4_xattr_ibody_header *header; |
2232 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
2233 | int error; |
2234 | ||
617ba13b | 2235 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 2236 | return -ENOSPC; |
daf83281 | 2237 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
ac27a0ec DK |
2238 | if (error) |
2239 | return error; | |
617ba13b | 2240 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 2241 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 2242 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 2243 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2244 | } else { |
2245 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 2246 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2247 | } |
2248 | return 0; | |
2249 | } | |
2250 | ||
3fd16462 JK |
2251 | static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
2252 | struct ext4_xattr_info *i) | |
2253 | { | |
2254 | void *value; | |
2255 | ||
0bd454c0 TE |
2256 | /* When e_value_inum is set the value is stored externally. */ |
2257 | if (s->here->e_value_inum) | |
2258 | return 0; | |
3fd16462 JK |
2259 | if (le32_to_cpu(s->here->e_value_size) != i->value_len) |
2260 | return 0; | |
2261 | value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); | |
2262 | return !memcmp(value, i->value, i->value_len); | |
2263 | } | |
2264 | ||
dec214d0 TE |
2265 | static struct buffer_head *ext4_xattr_get_block(struct inode *inode) |
2266 | { | |
2267 | struct buffer_head *bh; | |
2268 | int error; | |
2269 | ||
2270 | if (!EXT4_I(inode)->i_file_acl) | |
2271 | return NULL; | |
9da1f6d0 TT |
2272 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2273 | if (IS_ERR(bh)) | |
2274 | return bh; | |
dec214d0 | 2275 | error = ext4_xattr_check_block(inode, bh); |
70ca35b4 VA |
2276 | if (error) { |
2277 | brelse(bh); | |
dec214d0 | 2278 | return ERR_PTR(error); |
70ca35b4 | 2279 | } |
dec214d0 TE |
2280 | return bh; |
2281 | } | |
2282 | ||
ac27a0ec | 2283 | /* |
617ba13b | 2284 | * ext4_xattr_set_handle() |
ac27a0ec | 2285 | * |
6e9510b0 | 2286 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
2287 | * is NULL to remove an existing extended attribute, and non-NULL to |
2288 | * either replace an existing extended attribute, or create a new extended | |
2289 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
2290 | * specify that an extended attribute must exist and must not exist | |
2291 | * previous to the call, respectively. | |
2292 | * | |
2293 | * Returns 0, or a negative error number on failure. | |
2294 | */ | |
2295 | int | |
617ba13b | 2296 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
2297 | const char *name, const void *value, size_t value_len, |
2298 | int flags) | |
2299 | { | |
617ba13b | 2300 | struct ext4_xattr_info i = { |
ac27a0ec DK |
2301 | .name_index = name_index, |
2302 | .name = name, | |
2303 | .value = value, | |
2304 | .value_len = value_len, | |
e50e5129 | 2305 | .in_inode = 0, |
ac27a0ec | 2306 | }; |
617ba13b | 2307 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
2308 | .s = { .not_found = -ENODATA, }, |
2309 | }; | |
617ba13b | 2310 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
2311 | .s = { .not_found = -ENODATA, }, |
2312 | }; | |
c755e251 | 2313 | int no_expand; |
ac27a0ec DK |
2314 | int error; |
2315 | ||
2316 | if (!name) | |
2317 | return -EINVAL; | |
2318 | if (strlen(name) > 255) | |
2319 | return -ERANGE; | |
b8cb5a54 | 2320 | |
c755e251 | 2321 | ext4_write_lock_xattr(inode, &no_expand); |
4d20c685 | 2322 | |
c1a5d5f6 TE |
2323 | /* Check journal credits under write lock. */ |
2324 | if (ext4_handle_valid(handle)) { | |
dec214d0 | 2325 | struct buffer_head *bh; |
c1a5d5f6 TE |
2326 | int credits; |
2327 | ||
dec214d0 TE |
2328 | bh = ext4_xattr_get_block(inode); |
2329 | if (IS_ERR(bh)) { | |
2330 | error = PTR_ERR(bh); | |
2331 | goto cleanup; | |
2332 | } | |
2333 | ||
af65207c TE |
2334 | credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2335 | value_len, | |
2336 | flags & XATTR_CREATE); | |
dec214d0 TE |
2337 | brelse(bh); |
2338 | ||
c1a5d5f6 TE |
2339 | if (!ext4_handle_has_enough_credits(handle, credits)) { |
2340 | error = -ENOSPC; | |
2341 | goto cleanup; | |
2342 | } | |
2343 | } | |
2344 | ||
66543617 | 2345 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
2346 | if (error) |
2347 | goto cleanup; | |
2348 | ||
19f5fb7a | 2349 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
2350 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
2351 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 2352 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
2353 | } |
2354 | ||
617ba13b | 2355 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
2356 | if (error) |
2357 | goto cleanup; | |
2358 | if (is.s.not_found) | |
617ba13b | 2359 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
2360 | if (error) |
2361 | goto cleanup; | |
2362 | if (is.s.not_found && bs.s.not_found) { | |
2363 | error = -ENODATA; | |
2364 | if (flags & XATTR_REPLACE) | |
2365 | goto cleanup; | |
2366 | error = 0; | |
2367 | if (!value) | |
2368 | goto cleanup; | |
2369 | } else { | |
2370 | error = -EEXIST; | |
2371 | if (flags & XATTR_CREATE) | |
2372 | goto cleanup; | |
2373 | } | |
dec214d0 | 2374 | |
ac27a0ec DK |
2375 | if (!value) { |
2376 | if (!is.s.not_found) | |
e50e5129 | 2377 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 2378 | else if (!bs.s.not_found) |
617ba13b | 2379 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2380 | } else { |
3fd16462 JK |
2381 | error = 0; |
2382 | /* Xattr value did not change? Save us some work and bail out */ | |
2383 | if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) | |
2384 | goto cleanup; | |
2385 | if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) | |
2386 | goto cleanup; | |
2387 | ||
b347e2bc TE |
2388 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2389 | (EXT4_XATTR_SIZE(i.value_len) > | |
2390 | EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) | |
2391 | i.in_inode = 1; | |
2392 | retry_inode: | |
e50e5129 | 2393 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
2394 | if (!error && !bs.s.not_found) { |
2395 | i.value = NULL; | |
617ba13b | 2396 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2397 | } else if (error == -ENOSPC) { |
7e01c8e5 | 2398 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
8113972d VA |
2399 | brelse(bs.bh); |
2400 | bs.bh = NULL; | |
7e01c8e5 TY |
2401 | error = ext4_xattr_block_find(inode, &i, &bs); |
2402 | if (error) | |
2403 | goto cleanup; | |
2404 | } | |
617ba13b | 2405 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
b347e2bc | 2406 | if (!error && !is.s.not_found) { |
ac27a0ec | 2407 | i.value = NULL; |
e50e5129 AD |
2408 | error = ext4_xattr_ibody_set(handle, inode, &i, |
2409 | &is); | |
b347e2bc TE |
2410 | } else if (error == -ENOSPC) { |
2411 | /* | |
2412 | * Xattr does not fit in the block, store at | |
2413 | * external inode if possible. | |
2414 | */ | |
2415 | if (ext4_has_feature_ea_inode(inode->i_sb) && | |
2416 | !i.in_inode) { | |
2417 | i.in_inode = 1; | |
2418 | goto retry_inode; | |
2419 | } | |
ac27a0ec DK |
2420 | } |
2421 | } | |
2422 | } | |
2423 | if (!error) { | |
617ba13b | 2424 | ext4_xattr_update_super_block(handle, inode->i_sb); |
eeca7ea1 | 2425 | inode->i_ctime = current_time(inode); |
6dd4ee7c | 2426 | if (!value) |
c755e251 | 2427 | no_expand = 0; |
617ba13b | 2428 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 2429 | /* |
617ba13b | 2430 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
2431 | * error != 0. |
2432 | */ | |
2433 | is.iloc.bh = NULL; | |
2434 | if (IS_SYNC(inode)) | |
0390131b | 2435 | ext4_handle_sync(handle); |
ac27a0ec DK |
2436 | } |
2437 | ||
2438 | cleanup: | |
2439 | brelse(is.iloc.bh); | |
2440 | brelse(bs.bh); | |
c755e251 | 2441 | ext4_write_unlock_xattr(inode, &no_expand); |
ac27a0ec DK |
2442 | return error; |
2443 | } | |
2444 | ||
af65207c TE |
2445 | int ext4_xattr_set_credits(struct inode *inode, size_t value_len, |
2446 | bool is_create, int *credits) | |
c1a5d5f6 | 2447 | { |
dec214d0 TE |
2448 | struct buffer_head *bh; |
2449 | int err; | |
c1a5d5f6 | 2450 | |
dec214d0 | 2451 | *credits = 0; |
c1a5d5f6 | 2452 | |
dec214d0 TE |
2453 | if (!EXT4_SB(inode->i_sb)->s_journal) |
2454 | return 0; | |
c1a5d5f6 | 2455 | |
dec214d0 | 2456 | down_read(&EXT4_I(inode)->xattr_sem); |
c1a5d5f6 | 2457 | |
dec214d0 TE |
2458 | bh = ext4_xattr_get_block(inode); |
2459 | if (IS_ERR(bh)) { | |
2460 | err = PTR_ERR(bh); | |
2461 | } else { | |
af65207c TE |
2462 | *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2463 | value_len, is_create); | |
dec214d0 TE |
2464 | brelse(bh); |
2465 | err = 0; | |
c1a5d5f6 | 2466 | } |
dec214d0 TE |
2467 | |
2468 | up_read(&EXT4_I(inode)->xattr_sem); | |
2469 | return err; | |
c1a5d5f6 TE |
2470 | } |
2471 | ||
ac27a0ec | 2472 | /* |
617ba13b | 2473 | * ext4_xattr_set() |
ac27a0ec | 2474 | * |
617ba13b | 2475 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
2476 | * attribute modification is a filesystem transaction by itself. |
2477 | * | |
2478 | * Returns 0, or a negative error number on failure. | |
2479 | */ | |
2480 | int | |
617ba13b | 2481 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
2482 | const void *value, size_t value_len, int flags) |
2483 | { | |
2484 | handle_t *handle; | |
e50e5129 | 2485 | struct super_block *sb = inode->i_sb; |
ac27a0ec | 2486 | int error, retries = 0; |
c1a5d5f6 | 2487 | int credits; |
ac27a0ec | 2488 | |
b8cb5a54 TE |
2489 | error = dquot_initialize(inode); |
2490 | if (error) | |
2491 | return error; | |
e50e5129 | 2492 | |
ac27a0ec | 2493 | retry: |
af65207c TE |
2494 | error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, |
2495 | &credits); | |
dec214d0 TE |
2496 | if (error) |
2497 | return error; | |
2498 | ||
9924a92a | 2499 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
2500 | if (IS_ERR(handle)) { |
2501 | error = PTR_ERR(handle); | |
2502 | } else { | |
2503 | int error2; | |
2504 | ||
617ba13b | 2505 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 2506 | value, value_len, flags); |
617ba13b | 2507 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 2508 | if (error == -ENOSPC && |
e50e5129 | 2509 | ext4_should_retry_alloc(sb, &retries)) |
ac27a0ec DK |
2510 | goto retry; |
2511 | if (error == 0) | |
2512 | error = error2; | |
2513 | } | |
2514 | ||
2515 | return error; | |
2516 | } | |
2517 | ||
6dd4ee7c KS |
2518 | /* |
2519 | * Shift the EA entries in the inode to create space for the increased | |
2520 | * i_extra_isize. | |
2521 | */ | |
2522 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
2523 | int value_offs_shift, void *to, | |
94405713 | 2524 | void *from, size_t n) |
6dd4ee7c KS |
2525 | { |
2526 | struct ext4_xattr_entry *last = entry; | |
2527 | int new_offs; | |
2528 | ||
94405713 JK |
2529 | /* We always shift xattr headers further thus offsets get lower */ |
2530 | BUG_ON(value_offs_shift > 0); | |
2531 | ||
6dd4ee7c KS |
2532 | /* Adjust the value offsets of the entries */ |
2533 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 2534 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
2535 | new_offs = le16_to_cpu(last->e_value_offs) + |
2536 | value_offs_shift; | |
6dd4ee7c KS |
2537 | last->e_value_offs = cpu_to_le16(new_offs); |
2538 | } | |
2539 | } | |
2540 | /* Shift the entries by n bytes */ | |
2541 | memmove(to, from, n); | |
2542 | } | |
2543 | ||
3f2571c1 JK |
2544 | /* |
2545 | * Move xattr pointed to by 'entry' from inode into external xattr block | |
2546 | */ | |
2547 | static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, | |
2548 | struct ext4_inode *raw_inode, | |
2549 | struct ext4_xattr_entry *entry) | |
2550 | { | |
2551 | struct ext4_xattr_ibody_find *is = NULL; | |
2552 | struct ext4_xattr_block_find *bs = NULL; | |
2553 | char *buffer = NULL, *b_entry_name = NULL; | |
f6109100 | 2554 | size_t value_size = le32_to_cpu(entry->e_value_size); |
3f2571c1 JK |
2555 | struct ext4_xattr_info i = { |
2556 | .value = NULL, | |
2557 | .value_len = 0, | |
2558 | .name_index = entry->e_name_index, | |
f6109100 | 2559 | .in_inode = !!entry->e_value_inum, |
3f2571c1 JK |
2560 | }; |
2561 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2562 | int error; | |
2563 | ||
3f2571c1 JK |
2564 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); |
2565 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
2566 | buffer = kmalloc(value_size, GFP_NOFS); | |
2567 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
2568 | if (!is || !bs || !buffer || !b_entry_name) { | |
2569 | error = -ENOMEM; | |
2570 | goto out; | |
2571 | } | |
2572 | ||
2573 | is->s.not_found = -ENODATA; | |
2574 | bs->s.not_found = -ENODATA; | |
2575 | is->iloc.bh = NULL; | |
2576 | bs->bh = NULL; | |
2577 | ||
2578 | /* Save the entry name and the entry value */ | |
f6109100 | 2579 | if (entry->e_value_inum) { |
b9fc761e | 2580 | error = ext4_xattr_inode_get(inode, entry, buffer, value_size); |
f6109100 TE |
2581 | if (error) |
2582 | goto out; | |
2583 | } else { | |
2584 | size_t value_offs = le16_to_cpu(entry->e_value_offs); | |
2585 | memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); | |
2586 | } | |
2587 | ||
3f2571c1 JK |
2588 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); |
2589 | b_entry_name[entry->e_name_len] = '\0'; | |
2590 | i.name = b_entry_name; | |
2591 | ||
2592 | error = ext4_get_inode_loc(inode, &is->iloc); | |
2593 | if (error) | |
2594 | goto out; | |
2595 | ||
2596 | error = ext4_xattr_ibody_find(inode, &i, is); | |
2597 | if (error) | |
2598 | goto out; | |
2599 | ||
2600 | /* Remove the chosen entry from the inode */ | |
e50e5129 | 2601 | error = ext4_xattr_ibody_set(handle, inode, &i, is); |
3f2571c1 JK |
2602 | if (error) |
2603 | goto out; | |
2604 | ||
3f2571c1 JK |
2605 | i.value = buffer; |
2606 | i.value_len = value_size; | |
2607 | error = ext4_xattr_block_find(inode, &i, bs); | |
2608 | if (error) | |
2609 | goto out; | |
2610 | ||
2611 | /* Add entry which was removed from the inode into the block */ | |
2612 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
2613 | if (error) | |
2614 | goto out; | |
2615 | error = 0; | |
2616 | out: | |
2617 | kfree(b_entry_name); | |
2618 | kfree(buffer); | |
2619 | if (is) | |
2620 | brelse(is->iloc.bh); | |
4096fc09 VA |
2621 | if (bs) |
2622 | brelse(bs->bh); | |
3f2571c1 JK |
2623 | kfree(is); |
2624 | kfree(bs); | |
2625 | ||
2626 | return error; | |
2627 | } | |
2628 | ||
dfa2064b JK |
2629 | static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, |
2630 | struct ext4_inode *raw_inode, | |
2631 | int isize_diff, size_t ifree, | |
2632 | size_t bfree, int *total_ino) | |
2633 | { | |
2634 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2635 | struct ext4_xattr_entry *small_entry; | |
2636 | struct ext4_xattr_entry *entry; | |
2637 | struct ext4_xattr_entry *last; | |
2638 | unsigned int entry_size; /* EA entry size */ | |
2639 | unsigned int total_size; /* EA entry size + value size */ | |
2640 | unsigned int min_total_size; | |
2641 | int error; | |
2642 | ||
2643 | while (isize_diff > ifree) { | |
2644 | entry = NULL; | |
2645 | small_entry = NULL; | |
2646 | min_total_size = ~0U; | |
2647 | last = IFIRST(header); | |
2648 | /* Find the entry best suited to be pushed into EA block */ | |
2649 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
8a9ef17c TT |
2650 | /* never move system.data out of the inode */ |
2651 | if ((last->e_name_len == 4) && | |
2652 | (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) && | |
2653 | !memcmp(last->e_name, "data", 4)) | |
2654 | continue; | |
9bb21ced TE |
2655 | total_size = EXT4_XATTR_LEN(last->e_name_len); |
2656 | if (!last->e_value_inum) | |
2657 | total_size += EXT4_XATTR_SIZE( | |
2658 | le32_to_cpu(last->e_value_size)); | |
dfa2064b JK |
2659 | if (total_size <= bfree && |
2660 | total_size < min_total_size) { | |
2661 | if (total_size + ifree < isize_diff) { | |
2662 | small_entry = last; | |
2663 | } else { | |
2664 | entry = last; | |
2665 | min_total_size = total_size; | |
2666 | } | |
2667 | } | |
2668 | } | |
2669 | ||
2670 | if (entry == NULL) { | |
2671 | if (small_entry == NULL) | |
2672 | return -ENOSPC; | |
2673 | entry = small_entry; | |
2674 | } | |
2675 | ||
2676 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
9bb21ced TE |
2677 | total_size = entry_size; |
2678 | if (!entry->e_value_inum) | |
2679 | total_size += EXT4_XATTR_SIZE( | |
2680 | le32_to_cpu(entry->e_value_size)); | |
dfa2064b JK |
2681 | error = ext4_xattr_move_to_block(handle, inode, raw_inode, |
2682 | entry); | |
2683 | if (error) | |
2684 | return error; | |
2685 | ||
2686 | *total_ino -= entry_size; | |
2687 | ifree += total_size; | |
2688 | bfree -= total_size; | |
2689 | } | |
2690 | ||
2691 | return 0; | |
2692 | } | |
2693 | ||
6dd4ee7c KS |
2694 | /* |
2695 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
2696 | * Returns 0 on success or negative error number on failure. | |
2697 | */ | |
2698 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
2699 | struct ext4_inode *raw_inode, handle_t *handle) | |
2700 | { | |
2701 | struct ext4_xattr_ibody_header *header; | |
cf0a5e81 MX |
2702 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
2703 | static unsigned int mnt_count; | |
e3014d14 JK |
2704 | size_t min_offs; |
2705 | size_t ifree, bfree; | |
7b1b2c1b | 2706 | int total_ino; |
6e0cd088 | 2707 | void *base, *end; |
d0141191 | 2708 | int error = 0, tried_min_extra_isize = 0; |
cf0a5e81 | 2709 | int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); |
d0141191 | 2710 | int isize_diff; /* How much do we need to grow i_extra_isize */ |
6dd4ee7c | 2711 | |
6dd4ee7c | 2712 | retry: |
d0141191 | 2713 | isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; |
2e81a4ee | 2714 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) |
b640b2c5 | 2715 | return 0; |
6dd4ee7c KS |
2716 | |
2717 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
2718 | |
2719 | /* | |
2720 | * Check if enough free space is available in the inode to shift the | |
2721 | * entries ahead by new_extra_isize. | |
2722 | */ | |
2723 | ||
6e0cd088 | 2724 | base = IFIRST(header); |
6dd4ee7c KS |
2725 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
2726 | min_offs = end - base; | |
6ef63893 | 2727 | total_ino = sizeof(struct ext4_xattr_ibody_header) + sizeof(u32); |
6dd4ee7c | 2728 | |
9e92f48c TT |
2729 | error = xattr_check_inode(inode, header, end); |
2730 | if (error) | |
2731 | goto cleanup; | |
2732 | ||
6e0cd088 | 2733 | ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); |
e3014d14 JK |
2734 | if (ifree >= isize_diff) |
2735 | goto shift; | |
6dd4ee7c KS |
2736 | |
2737 | /* | |
2738 | * Enough free space isn't available in the inode, check if | |
2739 | * EA block can hold new_extra_isize bytes. | |
2740 | */ | |
2741 | if (EXT4_I(inode)->i_file_acl) { | |
be7e29ce VA |
2742 | struct buffer_head *bh; |
2743 | ||
9da1f6d0 TT |
2744 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2745 | if (IS_ERR(bh)) { | |
2746 | error = PTR_ERR(bh); | |
6dd4ee7c | 2747 | goto cleanup; |
9da1f6d0 | 2748 | } |
598e04ae | 2749 | error = ext4_xattr_check_block(inode, bh); |
be7e29ce VA |
2750 | if (error) { |
2751 | brelse(bh); | |
6dd4ee7c | 2752 | goto cleanup; |
be7e29ce | 2753 | } |
6dd4ee7c | 2754 | base = BHDR(bh); |
6dd4ee7c KS |
2755 | end = bh->b_data + bh->b_size; |
2756 | min_offs = end - base; | |
6e0cd088 JK |
2757 | bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, |
2758 | NULL); | |
b640b2c5 | 2759 | brelse(bh); |
e3014d14 | 2760 | if (bfree + ifree < isize_diff) { |
6dd4ee7c KS |
2761 | if (!tried_min_extra_isize && s_min_extra_isize) { |
2762 | tried_min_extra_isize++; | |
2763 | new_extra_isize = s_min_extra_isize; | |
6dd4ee7c KS |
2764 | goto retry; |
2765 | } | |
dfa2064b | 2766 | error = -ENOSPC; |
6dd4ee7c KS |
2767 | goto cleanup; |
2768 | } | |
2769 | } else { | |
e3014d14 | 2770 | bfree = inode->i_sb->s_blocksize; |
6dd4ee7c KS |
2771 | } |
2772 | ||
dfa2064b JK |
2773 | error = ext4_xattr_make_inode_space(handle, inode, raw_inode, |
2774 | isize_diff, ifree, bfree, | |
2775 | &total_ino); | |
2776 | if (error) { | |
2777 | if (error == -ENOSPC && !tried_min_extra_isize && | |
2778 | s_min_extra_isize) { | |
2779 | tried_min_extra_isize++; | |
2780 | new_extra_isize = s_min_extra_isize; | |
dfa2064b | 2781 | goto retry; |
6dd4ee7c | 2782 | } |
dfa2064b | 2783 | goto cleanup; |
6dd4ee7c | 2784 | } |
e3014d14 JK |
2785 | shift: |
2786 | /* Adjust the offsets and shift the remaining entries ahead */ | |
6e0cd088 | 2787 | ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize |
e3014d14 JK |
2788 | - new_extra_isize, (void *)raw_inode + |
2789 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
94405713 | 2790 | (void *)header, total_ino); |
e3014d14 | 2791 | EXT4_I(inode)->i_extra_isize = new_extra_isize; |
6dd4ee7c KS |
2792 | |
2793 | cleanup: | |
b640b2c5 | 2794 | if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { |
cf0a5e81 MX |
2795 | ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", |
2796 | inode->i_ino); | |
2797 | mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); | |
2798 | } | |
6dd4ee7c KS |
2799 | return error; |
2800 | } | |
2801 | ||
e50e5129 AD |
2802 | #define EIA_INCR 16 /* must be 2^n */ |
2803 | #define EIA_MASK (EIA_INCR - 1) | |
dec214d0 TE |
2804 | |
2805 | /* Add the large xattr @inode into @ea_inode_array for deferred iput(). | |
0421a189 | 2806 | * If @ea_inode_array is new or full it will be grown and the old |
e50e5129 AD |
2807 | * contents copied over. |
2808 | */ | |
2809 | static int | |
0421a189 TE |
2810 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, |
2811 | struct inode *inode) | |
e50e5129 | 2812 | { |
0421a189 | 2813 | if (*ea_inode_array == NULL) { |
e50e5129 AD |
2814 | /* |
2815 | * Start with 15 inodes, so it fits into a power-of-two size. | |
0421a189 | 2816 | * If *ea_inode_array is NULL, this is essentially offsetof() |
e50e5129 | 2817 | */ |
0421a189 TE |
2818 | (*ea_inode_array) = |
2819 | kmalloc(offsetof(struct ext4_xattr_inode_array, | |
2820 | inodes[EIA_MASK]), | |
e50e5129 | 2821 | GFP_NOFS); |
0421a189 | 2822 | if (*ea_inode_array == NULL) |
e50e5129 | 2823 | return -ENOMEM; |
0421a189 TE |
2824 | (*ea_inode_array)->count = 0; |
2825 | } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { | |
e50e5129 | 2826 | /* expand the array once all 15 + n * 16 slots are full */ |
0421a189 TE |
2827 | struct ext4_xattr_inode_array *new_array = NULL; |
2828 | int count = (*ea_inode_array)->count; | |
e50e5129 AD |
2829 | |
2830 | /* if new_array is NULL, this is essentially offsetof() */ | |
2831 | new_array = kmalloc( | |
0421a189 TE |
2832 | offsetof(struct ext4_xattr_inode_array, |
2833 | inodes[count + EIA_INCR]), | |
e50e5129 AD |
2834 | GFP_NOFS); |
2835 | if (new_array == NULL) | |
2836 | return -ENOMEM; | |
0421a189 TE |
2837 | memcpy(new_array, *ea_inode_array, |
2838 | offsetof(struct ext4_xattr_inode_array, inodes[count])); | |
2839 | kfree(*ea_inode_array); | |
2840 | *ea_inode_array = new_array; | |
e50e5129 | 2841 | } |
0421a189 | 2842 | (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; |
e50e5129 AD |
2843 | return 0; |
2844 | } | |
2845 | ||
ac27a0ec | 2846 | /* |
617ba13b | 2847 | * ext4_xattr_delete_inode() |
ac27a0ec | 2848 | * |
e50e5129 | 2849 | * Free extended attribute resources associated with this inode. Traverse |
dec214d0 TE |
2850 | * all entries and decrement reference on any xattr inodes associated with this |
2851 | * inode. This is called immediately before an inode is freed. We have exclusive | |
2852 | * access to the inode. If an orphan inode is deleted it will also release its | |
2853 | * references on xattr block and xattr inodes. | |
ac27a0ec | 2854 | */ |
dec214d0 TE |
2855 | int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, |
2856 | struct ext4_xattr_inode_array **ea_inode_array, | |
2857 | int extra_credits) | |
ac27a0ec DK |
2858 | { |
2859 | struct buffer_head *bh = NULL; | |
e50e5129 | 2860 | struct ext4_xattr_ibody_header *header; |
30a7eb97 | 2861 | struct ext4_iloc iloc = { .bh = NULL }; |
dec214d0 | 2862 | struct ext4_xattr_entry *entry; |
a6d05676 | 2863 | struct inode *ea_inode; |
30a7eb97 TE |
2864 | int error; |
2865 | ||
2866 | error = ext4_xattr_ensure_credits(handle, inode, extra_credits, | |
2867 | NULL /* bh */, | |
2868 | false /* dirty */, | |
2869 | false /* block_csum */); | |
2870 | if (error) { | |
2871 | EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); | |
2872 | goto cleanup; | |
2873 | } | |
ac27a0ec | 2874 | |
dec214d0 TE |
2875 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2876 | ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
e50e5129 | 2877 | |
dec214d0 TE |
2878 | error = ext4_get_inode_loc(inode, &iloc); |
2879 | if (error) { | |
2880 | EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); | |
2881 | goto cleanup; | |
2882 | } | |
30a7eb97 | 2883 | |
dec214d0 TE |
2884 | error = ext4_journal_get_write_access(handle, iloc.bh); |
2885 | if (error) { | |
2886 | EXT4_ERROR_INODE(inode, "write access (error %d)", | |
2887 | error); | |
2888 | goto cleanup; | |
2889 | } | |
e50e5129 | 2890 | |
dec214d0 TE |
2891 | header = IHDR(inode, ext4_raw_inode(&iloc)); |
2892 | if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) | |
2893 | ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, | |
2894 | IFIRST(header), | |
2895 | false /* block_csum */, | |
2896 | ea_inode_array, | |
2897 | extra_credits, | |
2898 | false /* skip_quota */); | |
ac27a0ec | 2899 | } |
e50e5129 | 2900 | |
dec214d0 | 2901 | if (EXT4_I(inode)->i_file_acl) { |
9da1f6d0 TT |
2902 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2903 | if (IS_ERR(bh)) { | |
2904 | error = PTR_ERR(bh); | |
2905 | if (error == -EIO) | |
2906 | EXT4_ERROR_INODE(inode, "block %llu read error", | |
2907 | EXT4_I(inode)->i_file_acl); | |
dec214d0 TE |
2908 | goto cleanup; |
2909 | } | |
2910 | error = ext4_xattr_check_block(inode, bh); | |
598e04ae | 2911 | if (error) |
e50e5129 | 2912 | goto cleanup; |
e50e5129 | 2913 | |
dec214d0 TE |
2914 | if (ext4_has_feature_ea_inode(inode->i_sb)) { |
2915 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
a6d05676 TE |
2916 | entry = EXT4_XATTR_NEXT(entry)) { |
2917 | if (!entry->e_value_inum) | |
2918 | continue; | |
2919 | error = ext4_xattr_inode_iget(inode, | |
2920 | le32_to_cpu(entry->e_value_inum), | |
2921 | le32_to_cpu(entry->e_hash), | |
2922 | &ea_inode); | |
2923 | if (error) | |
2924 | continue; | |
2925 | ext4_xattr_inode_free_quota(inode, ea_inode, | |
dec214d0 | 2926 | le32_to_cpu(entry->e_value_size)); |
a6d05676 TE |
2927 | iput(ea_inode); |
2928 | } | |
dec214d0 TE |
2929 | |
2930 | } | |
2931 | ||
2932 | ext4_xattr_release_block(handle, inode, bh, ea_inode_array, | |
2933 | extra_credits); | |
2934 | /* | |
2935 | * Update i_file_acl value in the same transaction that releases | |
2936 | * block. | |
2937 | */ | |
2938 | EXT4_I(inode)->i_file_acl = 0; | |
2939 | error = ext4_mark_inode_dirty(handle, inode); | |
2940 | if (error) { | |
2941 | EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", | |
2942 | error); | |
2943 | goto cleanup; | |
2944 | } | |
30a7eb97 | 2945 | } |
dec214d0 | 2946 | error = 0; |
ac27a0ec | 2947 | cleanup: |
30a7eb97 | 2948 | brelse(iloc.bh); |
ac27a0ec | 2949 | brelse(bh); |
e50e5129 AD |
2950 | return error; |
2951 | } | |
2952 | ||
0421a189 | 2953 | void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) |
e50e5129 | 2954 | { |
dec214d0 | 2955 | int idx; |
e50e5129 | 2956 | |
0421a189 | 2957 | if (ea_inode_array == NULL) |
e50e5129 AD |
2958 | return; |
2959 | ||
dec214d0 TE |
2960 | for (idx = 0; idx < ea_inode_array->count; ++idx) |
2961 | iput(ea_inode_array->inodes[idx]); | |
0421a189 | 2962 | kfree(ea_inode_array); |
ac27a0ec DK |
2963 | } |
2964 | ||
ac27a0ec | 2965 | /* |
47387409 | 2966 | * ext4_xattr_block_cache_insert() |
ac27a0ec | 2967 | * |
47387409 | 2968 | * Create a new entry in the extended attribute block cache, and insert |
ac27a0ec DK |
2969 | * it unless such an entry is already in the cache. |
2970 | * | |
2971 | * Returns 0, or a negative error number on failure. | |
2972 | */ | |
2973 | static void | |
47387409 TE |
2974 | ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, |
2975 | struct buffer_head *bh) | |
ac27a0ec | 2976 | { |
6048c64b AG |
2977 | struct ext4_xattr_header *header = BHDR(bh); |
2978 | __u32 hash = le32_to_cpu(header->h_hash); | |
2979 | int reusable = le32_to_cpu(header->h_refcount) < | |
2980 | EXT4_XATTR_REFCOUNT_MAX; | |
ac27a0ec DK |
2981 | int error; |
2982 | ||
cdb7ee4c TE |
2983 | if (!ea_block_cache) |
2984 | return; | |
47387409 | 2985 | error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, |
6048c64b | 2986 | bh->b_blocknr, reusable); |
ac27a0ec | 2987 | if (error) { |
82939d79 | 2988 | if (error == -EBUSY) |
ac27a0ec | 2989 | ea_bdebug(bh, "already in cache"); |
82939d79 | 2990 | } else |
ac27a0ec | 2991 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
2992 | } |
2993 | ||
2994 | /* | |
617ba13b | 2995 | * ext4_xattr_cmp() |
ac27a0ec DK |
2996 | * |
2997 | * Compare two extended attribute blocks for equality. | |
2998 | * | |
2999 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
3000 | * a negative error number on errors. | |
3001 | */ | |
3002 | static int | |
617ba13b MC |
3003 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
3004 | struct ext4_xattr_header *header2) | |
ac27a0ec | 3005 | { |
617ba13b | 3006 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
3007 | |
3008 | entry1 = ENTRY(header1+1); | |
3009 | entry2 = ENTRY(header2+1); | |
3010 | while (!IS_LAST_ENTRY(entry1)) { | |
3011 | if (IS_LAST_ENTRY(entry2)) | |
3012 | return 1; | |
3013 | if (entry1->e_hash != entry2->e_hash || | |
3014 | entry1->e_name_index != entry2->e_name_index || | |
3015 | entry1->e_name_len != entry2->e_name_len || | |
3016 | entry1->e_value_size != entry2->e_value_size || | |
e50e5129 | 3017 | entry1->e_value_inum != entry2->e_value_inum || |
ac27a0ec DK |
3018 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) |
3019 | return 1; | |
7cec1918 TE |
3020 | if (!entry1->e_value_inum && |
3021 | memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), | |
ac27a0ec DK |
3022 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), |
3023 | le32_to_cpu(entry1->e_value_size))) | |
3024 | return 1; | |
3025 | ||
617ba13b MC |
3026 | entry1 = EXT4_XATTR_NEXT(entry1); |
3027 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
3028 | } |
3029 | if (!IS_LAST_ENTRY(entry2)) | |
3030 | return 1; | |
3031 | return 0; | |
3032 | } | |
3033 | ||
3034 | /* | |
47387409 | 3035 | * ext4_xattr_block_cache_find() |
ac27a0ec DK |
3036 | * |
3037 | * Find an identical extended attribute block. | |
3038 | * | |
3039 | * Returns a pointer to the block found, or NULL if such a block was | |
3040 | * not found or an error occurred. | |
3041 | */ | |
3042 | static struct buffer_head * | |
47387409 TE |
3043 | ext4_xattr_block_cache_find(struct inode *inode, |
3044 | struct ext4_xattr_header *header, | |
3045 | struct mb_cache_entry **pce) | |
ac27a0ec DK |
3046 | { |
3047 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 | 3048 | struct mb_cache_entry *ce; |
47387409 | 3049 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec | 3050 | |
cdb7ee4c TE |
3051 | if (!ea_block_cache) |
3052 | return NULL; | |
ac27a0ec DK |
3053 | if (!header->h_hash) |
3054 | return NULL; /* never share */ | |
3055 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
47387409 | 3056 | ce = mb_cache_entry_find_first(ea_block_cache, hash); |
ac27a0ec DK |
3057 | while (ce) { |
3058 | struct buffer_head *bh; | |
3059 | ||
9da1f6d0 TT |
3060 | bh = ext4_sb_bread(inode->i_sb, ce->e_value, REQ_PRIO); |
3061 | if (IS_ERR(bh)) { | |
3062 | if (PTR_ERR(bh) == -ENOMEM) | |
3063 | return NULL; | |
24676da4 | 3064 | EXT4_ERROR_INODE(inode, "block %lu read error", |
c07dfcb4 | 3065 | (unsigned long)ce->e_value); |
617ba13b | 3066 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
ac27a0ec DK |
3067 | *pce = ce; |
3068 | return bh; | |
3069 | } | |
3070 | brelse(bh); | |
47387409 | 3071 | ce = mb_cache_entry_find_next(ea_block_cache, ce); |
ac27a0ec DK |
3072 | } |
3073 | return NULL; | |
3074 | } | |
3075 | ||
3076 | #define NAME_HASH_SHIFT 5 | |
3077 | #define VALUE_HASH_SHIFT 16 | |
3078 | ||
3079 | /* | |
617ba13b | 3080 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
3081 | * |
3082 | * Compute the hash of an extended attribute. | |
3083 | */ | |
b9fc761e TE |
3084 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
3085 | size_t value_count) | |
ac27a0ec DK |
3086 | { |
3087 | __u32 hash = 0; | |
ac27a0ec | 3088 | |
b9fc761e | 3089 | while (name_len--) { |
ac27a0ec DK |
3090 | hash = (hash << NAME_HASH_SHIFT) ^ |
3091 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
3092 | *name++; | |
3093 | } | |
b9fc761e TE |
3094 | while (value_count--) { |
3095 | hash = (hash << VALUE_HASH_SHIFT) ^ | |
3096 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
3097 | le32_to_cpu(*value++); | |
ac27a0ec | 3098 | } |
b9fc761e | 3099 | return cpu_to_le32(hash); |
ac27a0ec DK |
3100 | } |
3101 | ||
3102 | #undef NAME_HASH_SHIFT | |
3103 | #undef VALUE_HASH_SHIFT | |
3104 | ||
3105 | #define BLOCK_HASH_SHIFT 16 | |
3106 | ||
3107 | /* | |
617ba13b | 3108 | * ext4_xattr_rehash() |
ac27a0ec DK |
3109 | * |
3110 | * Re-compute the extended attribute hash value after an entry has changed. | |
3111 | */ | |
daf83281 | 3112 | static void ext4_xattr_rehash(struct ext4_xattr_header *header) |
ac27a0ec | 3113 | { |
617ba13b | 3114 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
3115 | __u32 hash = 0; |
3116 | ||
ac27a0ec DK |
3117 | here = ENTRY(header+1); |
3118 | while (!IS_LAST_ENTRY(here)) { | |
3119 | if (!here->e_hash) { | |
3120 | /* Block is not shared if an entry's hash value == 0 */ | |
3121 | hash = 0; | |
3122 | break; | |
3123 | } | |
3124 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
3125 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
3126 | le32_to_cpu(here->e_hash); | |
617ba13b | 3127 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
3128 | } |
3129 | header->h_hash = cpu_to_le32(hash); | |
3130 | } | |
3131 | ||
3132 | #undef BLOCK_HASH_SHIFT | |
3133 | ||
9c191f70 M |
3134 | #define HASH_BUCKET_BITS 10 |
3135 | ||
7a2508e1 | 3136 | struct mb_cache * |
82939d79 | 3137 | ext4_xattr_create_cache(void) |
ac27a0ec | 3138 | { |
7a2508e1 | 3139 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
3140 | } |
3141 | ||
7a2508e1 | 3142 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 3143 | { |
9c191f70 | 3144 | if (cache) |
7a2508e1 | 3145 | mb_cache_destroy(cache); |
ac27a0ec | 3146 | } |
9c191f70 | 3147 |