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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ac27a0ec | 2 | /* |
617ba13b | 3 | * linux/fs/ext4/xattr.c |
ac27a0ec DK |
4 | * |
5 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> | |
6 | * | |
7 | * Fix by Harrison Xing <harrison@mountainviewdata.com>. | |
617ba13b | 8 | * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>. |
ac27a0ec DK |
9 | * Extended attributes for symlinks and special files added per |
10 | * suggestion of Luka Renko <luka.renko@hermes.si>. | |
11 | * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, | |
12 | * Red Hat Inc. | |
13 | * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz | |
14 | * and Andreas Gruenbacher <agruen@suse.de>. | |
15 | */ | |
16 | ||
17 | /* | |
18 | * Extended attributes are stored directly in inodes (on file systems with | |
19 | * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl | |
20 | * field contains the block number if an inode uses an additional block. All | |
21 | * attributes must fit in the inode and one additional block. Blocks that | |
22 | * contain the identical set of attributes may be shared among several inodes. | |
23 | * Identical blocks are detected by keeping a cache of blocks that have | |
24 | * recently been accessed. | |
25 | * | |
26 | * The attributes in inodes and on blocks have a different header; the entries | |
27 | * are stored in the same format: | |
28 | * | |
29 | * +------------------+ | |
30 | * | header | | |
31 | * | entry 1 | | | |
32 | * | entry 2 | | growing downwards | |
33 | * | entry 3 | v | |
34 | * | four null bytes | | |
35 | * | . . . | | |
36 | * | value 1 | ^ | |
37 | * | value 3 | | growing upwards | |
38 | * | value 2 | | | |
39 | * +------------------+ | |
40 | * | |
41 | * The header is followed by multiple entry descriptors. In disk blocks, the | |
42 | * entry descriptors are kept sorted. In inodes, they are unsorted. The | |
43 | * attribute values are aligned to the end of the block in no specific order. | |
44 | * | |
45 | * Locking strategy | |
46 | * ---------------- | |
617ba13b | 47 | * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem. |
ac27a0ec DK |
48 | * EA blocks are only changed if they are exclusive to an inode, so |
49 | * holding xattr_sem also means that nothing but the EA block's reference | |
50 | * count can change. Multiple writers to the same block are synchronized | |
51 | * by the buffer lock. | |
52 | */ | |
53 | ||
54 | #include <linux/init.h> | |
55 | #include <linux/fs.h> | |
56 | #include <linux/slab.h> | |
7a2508e1 | 57 | #include <linux/mbcache.h> |
ac27a0ec | 58 | #include <linux/quotaops.h> |
ee73f9a5 | 59 | #include <linux/iversion.h> |
3dcf5451 CH |
60 | #include "ext4_jbd2.h" |
61 | #include "ext4.h" | |
ac27a0ec DK |
62 | #include "xattr.h" |
63 | #include "acl.h" | |
64 | ||
617ba13b | 65 | #ifdef EXT4_XATTR_DEBUG |
d74f3d25 JP |
66 | # define ea_idebug(inode, fmt, ...) \ |
67 | printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \ | |
68 | inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__) | |
69 | # define ea_bdebug(bh, fmt, ...) \ | |
70 | printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \ | |
71 | bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__) | |
ac27a0ec | 72 | #else |
ace36ad4 JP |
73 | # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
74 | # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) | |
ac27a0ec DK |
75 | #endif |
76 | ||
47387409 TE |
77 | static void ext4_xattr_block_cache_insert(struct mb_cache *, |
78 | struct buffer_head *); | |
79 | static struct buffer_head * | |
80 | ext4_xattr_block_cache_find(struct inode *, struct ext4_xattr_header *, | |
81 | struct mb_cache_entry **); | |
b9fc761e TE |
82 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
83 | size_t value_count); | |
f3bbac32 LT |
84 | static __le32 ext4_xattr_hash_entry_signed(char *name, size_t name_len, __le32 *value, |
85 | size_t value_count); | |
daf83281 | 86 | static void ext4_xattr_rehash(struct ext4_xattr_header *); |
ac27a0ec | 87 | |
d6006186 | 88 | static const struct xattr_handler * const ext4_xattr_handler_map[] = { |
617ba13b | 89 | [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, |
03010a33 | 90 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
91 | [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
92 | [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, | |
ac27a0ec | 93 | #endif |
617ba13b | 94 | [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, |
03010a33 | 95 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 96 | [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, |
ac27a0ec | 97 | #endif |
88ee9d57 | 98 | [EXT4_XATTR_INDEX_HURD] = &ext4_xattr_hurd_handler, |
ac27a0ec DK |
99 | }; |
100 | ||
11e27528 | 101 | const struct xattr_handler *ext4_xattr_handlers[] = { |
617ba13b MC |
102 | &ext4_xattr_user_handler, |
103 | &ext4_xattr_trusted_handler, | |
03010a33 | 104 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
105 | &posix_acl_access_xattr_handler, |
106 | &posix_acl_default_xattr_handler, | |
ac27a0ec | 107 | #endif |
03010a33 | 108 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 109 | &ext4_xattr_security_handler, |
ac27a0ec | 110 | #endif |
88ee9d57 | 111 | &ext4_xattr_hurd_handler, |
ac27a0ec DK |
112 | NULL |
113 | }; | |
114 | ||
47387409 TE |
115 | #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ |
116 | inode->i_sb->s_fs_info)->s_ea_block_cache) | |
9c191f70 | 117 | |
dec214d0 TE |
118 | #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ |
119 | inode->i_sb->s_fs_info)->s_ea_inode_cache) | |
120 | ||
30a7eb97 TE |
121 | static int |
122 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, | |
123 | struct inode *inode); | |
124 | ||
33d201e0 TE |
125 | #ifdef CONFIG_LOCKDEP |
126 | void ext4_xattr_inode_set_class(struct inode *ea_inode) | |
127 | { | |
128 | lockdep_set_subclass(&ea_inode->i_rwsem, 1); | |
129 | } | |
130 | #endif | |
131 | ||
cc8e94fd DW |
132 | static __le32 ext4_xattr_block_csum(struct inode *inode, |
133 | sector_t block_nr, | |
134 | struct ext4_xattr_header *hdr) | |
135 | { | |
136 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
d6a77105 | 137 | __u32 csum; |
d6a77105 | 138 | __le64 dsk_block_nr = cpu_to_le64(block_nr); |
b47820ed DJ |
139 | __u32 dummy_csum = 0; |
140 | int offset = offsetof(struct ext4_xattr_header, h_checksum); | |
cc8e94fd | 141 | |
d6a77105 TT |
142 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, |
143 | sizeof(dsk_block_nr)); | |
b47820ed DJ |
144 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); |
145 | csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); | |
146 | offset += sizeof(dummy_csum); | |
147 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, | |
148 | EXT4_BLOCK_SIZE(inode->i_sb) - offset); | |
41eb70dd | 149 | |
cc8e94fd DW |
150 | return cpu_to_le32(csum); |
151 | } | |
152 | ||
153 | static int ext4_xattr_block_csum_verify(struct inode *inode, | |
dac7a4b4 | 154 | struct buffer_head *bh) |
cc8e94fd | 155 | { |
dac7a4b4 TT |
156 | struct ext4_xattr_header *hdr = BHDR(bh); |
157 | int ret = 1; | |
cc8e94fd | 158 | |
dac7a4b4 TT |
159 | if (ext4_has_metadata_csum(inode->i_sb)) { |
160 | lock_buffer(bh); | |
161 | ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, | |
162 | bh->b_blocknr, hdr)); | |
163 | unlock_buffer(bh); | |
164 | } | |
165 | return ret; | |
cc8e94fd DW |
166 | } |
167 | ||
dac7a4b4 TT |
168 | static void ext4_xattr_block_csum_set(struct inode *inode, |
169 | struct buffer_head *bh) | |
cc8e94fd | 170 | { |
dac7a4b4 TT |
171 | if (ext4_has_metadata_csum(inode->i_sb)) |
172 | BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, | |
173 | bh->b_blocknr, BHDR(bh)); | |
cc8e94fd DW |
174 | } |
175 | ||
11e27528 | 176 | static inline const struct xattr_handler * |
617ba13b | 177 | ext4_xattr_handler(int name_index) |
ac27a0ec | 178 | { |
11e27528 | 179 | const struct xattr_handler *handler = NULL; |
ac27a0ec | 180 | |
617ba13b MC |
181 | if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
182 | handler = ext4_xattr_handler_map[name_index]; | |
ac27a0ec DK |
183 | return handler; |
184 | } | |
185 | ||
ac27a0ec | 186 | static int |
3478c83c TT |
187 | check_xattrs(struct inode *inode, struct buffer_head *bh, |
188 | struct ext4_xattr_entry *entry, void *end, void *value_start, | |
189 | const char *function, unsigned int line) | |
ac27a0ec | 190 | { |
a0626e75 | 191 | struct ext4_xattr_entry *e = entry; |
3478c83c TT |
192 | int err = -EFSCORRUPTED; |
193 | char *err_str; | |
194 | ||
195 | if (bh) { | |
196 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || | |
197 | BHDR(bh)->h_blocks != cpu_to_le32(1)) { | |
198 | err_str = "invalid header"; | |
199 | goto errout; | |
200 | } | |
201 | if (buffer_verified(bh)) | |
202 | return 0; | |
203 | if (!ext4_xattr_block_csum_verify(inode, bh)) { | |
204 | err = -EFSBADCRC; | |
205 | err_str = "invalid checksum"; | |
206 | goto errout; | |
207 | } | |
208 | } else { | |
209 | struct ext4_xattr_ibody_header *header = value_start; | |
210 | ||
211 | header -= 1; | |
212 | if (end - (void *)header < sizeof(*header) + sizeof(u32)) { | |
213 | err_str = "in-inode xattr block too small"; | |
214 | goto errout; | |
215 | } | |
216 | if (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) { | |
217 | err_str = "bad magic number in in-inode xattr"; | |
218 | goto errout; | |
219 | } | |
220 | } | |
a0626e75 | 221 | |
d7614cc1 | 222 | /* Find the end of the names list */ |
a0626e75 DW |
223 | while (!IS_LAST_ENTRY(e)) { |
224 | struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); | |
3478c83c TT |
225 | if ((void *)next >= end) { |
226 | err_str = "e_name out of bounds"; | |
227 | goto errout; | |
228 | } | |
229 | if (strnlen(e->e_name, e->e_name_len) != e->e_name_len) { | |
230 | err_str = "bad e_name length"; | |
231 | goto errout; | |
232 | } | |
a0626e75 | 233 | e = next; |
ac27a0ec | 234 | } |
a0626e75 | 235 | |
d7614cc1 | 236 | /* Check the values */ |
a0626e75 | 237 | while (!IS_LAST_ENTRY(entry)) { |
ce3fd194 | 238 | u32 size = le32_to_cpu(entry->e_value_size); |
3478c83c | 239 | unsigned long ea_ino = le32_to_cpu(entry->e_value_inum); |
ce3fd194 | 240 | |
3478c83c TT |
241 | if (!ext4_has_feature_ea_inode(inode->i_sb) && ea_ino) { |
242 | err_str = "ea_inode specified without ea_inode feature enabled"; | |
243 | goto errout; | |
244 | } | |
245 | if (ea_ino && ((ea_ino == EXT4_ROOT_INO) || | |
246 | !ext4_valid_inum(inode->i_sb, ea_ino))) { | |
247 | err_str = "invalid ea_ino"; | |
248 | goto errout; | |
249 | } | |
250 | if (size > EXT4_XATTR_SIZE_MAX) { | |
251 | err_str = "e_value size too large"; | |
252 | goto errout; | |
253 | } | |
ce3fd194 EB |
254 | |
255 | if (size != 0 && entry->e_value_inum == 0) { | |
d7614cc1 | 256 | u16 offs = le16_to_cpu(entry->e_value_offs); |
d7614cc1 EB |
257 | void *value; |
258 | ||
259 | /* | |
260 | * The value cannot overlap the names, and the value | |
261 | * with padding cannot extend beyond 'end'. Check both | |
262 | * the padded and unpadded sizes, since the size may | |
263 | * overflow to 0 when adding padding. | |
264 | */ | |
3478c83c TT |
265 | if (offs > end - value_start) { |
266 | err_str = "e_value out of bounds"; | |
267 | goto errout; | |
268 | } | |
d7614cc1 EB |
269 | value = value_start + offs; |
270 | if (value < (void *)e + sizeof(u32) || | |
271 | size > end - value || | |
3478c83c TT |
272 | EXT4_XATTR_SIZE(size) > end - value) { |
273 | err_str = "overlapping e_value "; | |
274 | goto errout; | |
275 | } | |
d7614cc1 | 276 | } |
a0626e75 DW |
277 | entry = EXT4_XATTR_NEXT(entry); |
278 | } | |
3478c83c TT |
279 | if (bh) |
280 | set_buffer_verified(bh); | |
ac27a0ec | 281 | return 0; |
3478c83c TT |
282 | |
283 | errout: | |
284 | if (bh) | |
285 | __ext4_error_inode(inode, function, line, 0, -err, | |
286 | "corrupted xattr block %llu: %s", | |
287 | (unsigned long long) bh->b_blocknr, | |
288 | err_str); | |
289 | else | |
290 | __ext4_error_inode(inode, function, line, 0, -err, | |
291 | "corrupted in-inode xattr: %s", err_str); | |
292 | return err; | |
ac27a0ec DK |
293 | } |
294 | ||
295 | static inline int | |
de05ca85 TT |
296 | __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh, |
297 | const char *function, unsigned int line) | |
ac27a0ec | 298 | { |
3478c83c TT |
299 | return check_xattrs(inode, bh, BFIRST(bh), bh->b_data + bh->b_size, |
300 | bh->b_data, function, line); | |
ac27a0ec DK |
301 | } |
302 | ||
de05ca85 TT |
303 | #define ext4_xattr_check_block(inode, bh) \ |
304 | __ext4_xattr_check_block((inode), (bh), __func__, __LINE__) | |
305 | ||
306 | ||
3478c83c | 307 | static inline int |
9e92f48c TT |
308 | __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, |
309 | void *end, const char *function, unsigned int line) | |
310 | { | |
3478c83c TT |
311 | return check_xattrs(inode, NULL, IFIRST(header), end, IFIRST(header), |
312 | function, line); | |
9e92f48c TT |
313 | } |
314 | ||
315 | #define xattr_check_inode(inode, header, end) \ | |
316 | __xattr_check_inode((inode), (header), (end), __func__, __LINE__) | |
317 | ||
ac27a0ec | 318 | static int |
9496005d TT |
319 | xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry, |
320 | void *end, int name_index, const char *name, int sorted) | |
ac27a0ec | 321 | { |
9496005d | 322 | struct ext4_xattr_entry *entry, *next; |
ac27a0ec DK |
323 | size_t name_len; |
324 | int cmp = 1; | |
325 | ||
326 | if (name == NULL) | |
327 | return -EINVAL; | |
328 | name_len = strlen(name); | |
9496005d TT |
329 | for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) { |
330 | next = EXT4_XATTR_NEXT(entry); | |
331 | if ((void *) next >= end) { | |
332 | EXT4_ERROR_INODE(inode, "corrupted xattr entries"); | |
333 | return -EFSCORRUPTED; | |
334 | } | |
ac27a0ec DK |
335 | cmp = name_index - entry->e_name_index; |
336 | if (!cmp) | |
337 | cmp = name_len - entry->e_name_len; | |
338 | if (!cmp) | |
339 | cmp = memcmp(name, entry->e_name, name_len); | |
340 | if (cmp <= 0 && (sorted || cmp == 0)) | |
341 | break; | |
342 | } | |
343 | *pentry = entry; | |
ac27a0ec DK |
344 | return cmp ? -ENODATA : 0; |
345 | } | |
346 | ||
dec214d0 TE |
347 | static u32 |
348 | ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) | |
349 | { | |
350 | return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); | |
351 | } | |
352 | ||
353 | static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) | |
354 | { | |
355 | return ((u64)ea_inode->i_ctime.tv_sec << 32) | | |
ee73f9a5 | 356 | (u32) inode_peek_iversion_raw(ea_inode); |
dec214d0 TE |
357 | } |
358 | ||
359 | static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) | |
360 | { | |
361 | ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); | |
ee73f9a5 | 362 | inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); |
dec214d0 TE |
363 | } |
364 | ||
365 | static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) | |
366 | { | |
367 | return (u32)ea_inode->i_atime.tv_sec; | |
368 | } | |
369 | ||
370 | static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) | |
371 | { | |
372 | ea_inode->i_atime.tv_sec = hash; | |
373 | } | |
374 | ||
e50e5129 AD |
375 | /* |
376 | * Read the EA value from an inode. | |
377 | */ | |
90966693 | 378 | static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) |
e50e5129 | 379 | { |
9699d4f9 TE |
380 | int blocksize = 1 << ea_inode->i_blkbits; |
381 | int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; | |
382 | int tail_size = (size % blocksize) ?: blocksize; | |
383 | struct buffer_head *bhs_inline[8]; | |
384 | struct buffer_head **bhs = bhs_inline; | |
385 | int i, ret; | |
386 | ||
387 | if (bh_count > ARRAY_SIZE(bhs_inline)) { | |
388 | bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); | |
389 | if (!bhs) | |
390 | return -ENOMEM; | |
391 | } | |
90966693 | 392 | |
9699d4f9 TE |
393 | ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, |
394 | true /* wait */, bhs); | |
395 | if (ret) | |
396 | goto free_bhs; | |
e50e5129 | 397 | |
9699d4f9 TE |
398 | for (i = 0; i < bh_count; i++) { |
399 | /* There shouldn't be any holes in ea_inode. */ | |
400 | if (!bhs[i]) { | |
401 | ret = -EFSCORRUPTED; | |
402 | goto put_bhs; | |
403 | } | |
404 | memcpy((char *)buf + blocksize * i, bhs[i]->b_data, | |
405 | i < bh_count - 1 ? blocksize : tail_size); | |
e50e5129 | 406 | } |
9699d4f9 TE |
407 | ret = 0; |
408 | put_bhs: | |
409 | for (i = 0; i < bh_count; i++) | |
410 | brelse(bhs[i]); | |
411 | free_bhs: | |
412 | if (bhs != bhs_inline) | |
413 | kfree(bhs); | |
414 | return ret; | |
e50e5129 AD |
415 | } |
416 | ||
a6d05676 TE |
417 | #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) |
418 | ||
bab79b04 | 419 | static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, |
a6d05676 | 420 | u32 ea_inode_hash, struct inode **ea_inode) |
e50e5129 | 421 | { |
bab79b04 TE |
422 | struct inode *inode; |
423 | int err; | |
e50e5129 | 424 | |
0f7bfd6f BL |
425 | /* |
426 | * We have to check for this corruption early as otherwise | |
427 | * iget_locked() could wait indefinitely for the state of our | |
428 | * parent inode. | |
429 | */ | |
430 | if (parent->i_ino == ea_ino) { | |
431 | ext4_error(parent->i_sb, | |
432 | "Parent and EA inode have the same ino %lu", ea_ino); | |
433 | return -EFSCORRUPTED; | |
434 | } | |
435 | ||
8a363970 | 436 | inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_NORMAL); |
bab79b04 TE |
437 | if (IS_ERR(inode)) { |
438 | err = PTR_ERR(inode); | |
dec214d0 TE |
439 | ext4_error(parent->i_sb, |
440 | "error while reading EA inode %lu err=%d", ea_ino, | |
441 | err); | |
bab79b04 | 442 | return err; |
e50e5129 AD |
443 | } |
444 | ||
bab79b04 | 445 | if (is_bad_inode(inode)) { |
dec214d0 TE |
446 | ext4_error(parent->i_sb, |
447 | "error while reading EA inode %lu is_bad_inode", | |
448 | ea_ino); | |
bab79b04 TE |
449 | err = -EIO; |
450 | goto error; | |
451 | } | |
452 | ||
bab79b04 | 453 | if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { |
dec214d0 TE |
454 | ext4_error(parent->i_sb, |
455 | "EA inode %lu does not have EXT4_EA_INODE_FL flag", | |
456 | ea_ino); | |
bab79b04 | 457 | err = -EINVAL; |
e50e5129 AD |
458 | goto error; |
459 | } | |
460 | ||
a6d05676 TE |
461 | ext4_xattr_inode_set_class(inode); |
462 | ||
463 | /* | |
464 | * Check whether this is an old Lustre-style xattr inode. Lustre | |
465 | * implementation does not have hash validation, rather it has a | |
466 | * backpointer from ea_inode to the parent inode. | |
467 | */ | |
468 | if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && | |
469 | EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && | |
470 | inode->i_generation == parent->i_generation) { | |
471 | ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); | |
472 | ext4_xattr_inode_set_ref(inode, 1); | |
473 | } else { | |
474 | inode_lock(inode); | |
475 | inode->i_flags |= S_NOQUOTA; | |
476 | inode_unlock(inode); | |
477 | } | |
478 | ||
bab79b04 TE |
479 | *ea_inode = inode; |
480 | return 0; | |
e50e5129 | 481 | error: |
bab79b04 TE |
482 | iput(inode); |
483 | return err; | |
e50e5129 AD |
484 | } |
485 | ||
6bc0d63d JK |
486 | /* Remove entry from mbcache when EA inode is getting evicted */ |
487 | void ext4_evict_ea_inode(struct inode *inode) | |
488 | { | |
65f8b800 JK |
489 | struct mb_cache_entry *oe; |
490 | ||
491 | if (!EA_INODE_CACHE(inode)) | |
492 | return; | |
493 | /* Wait for entry to get unused so that we can remove it */ | |
494 | while ((oe = mb_cache_entry_delete_or_get(EA_INODE_CACHE(inode), | |
495 | ext4_xattr_inode_get_hash(inode), inode->i_ino))) { | |
496 | mb_cache_entry_wait_unused(oe); | |
497 | mb_cache_entry_put(EA_INODE_CACHE(inode), oe); | |
498 | } | |
6bc0d63d JK |
499 | } |
500 | ||
dec214d0 | 501 | static int |
b9fc761e TE |
502 | ext4_xattr_inode_verify_hashes(struct inode *ea_inode, |
503 | struct ext4_xattr_entry *entry, void *buffer, | |
504 | size_t size) | |
dec214d0 TE |
505 | { |
506 | u32 hash; | |
507 | ||
508 | /* Verify stored hash matches calculated hash. */ | |
509 | hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); | |
510 | if (hash != ext4_xattr_inode_get_hash(ea_inode)) | |
511 | return -EFSCORRUPTED; | |
b9fc761e TE |
512 | |
513 | if (entry) { | |
514 | __le32 e_hash, tmp_data; | |
515 | ||
516 | /* Verify entry hash. */ | |
517 | tmp_data = cpu_to_le32(hash); | |
518 | e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, | |
519 | &tmp_data, 1); | |
f3bbac32 LT |
520 | /* All good? */ |
521 | if (e_hash == entry->e_hash) | |
522 | return 0; | |
523 | ||
524 | /* | |
525 | * Not good. Maybe the entry hash was calculated | |
526 | * using the buggy signed char version? | |
527 | */ | |
528 | e_hash = ext4_xattr_hash_entry_signed(entry->e_name, entry->e_name_len, | |
529 | &tmp_data, 1); | |
530 | if (e_hash == entry->e_hash) | |
531 | return 0; | |
532 | ||
533 | /* Still no match - bad */ | |
534 | return -EFSCORRUPTED; | |
b9fc761e | 535 | } |
dec214d0 TE |
536 | return 0; |
537 | } | |
538 | ||
e50e5129 | 539 | /* |
b9fc761e | 540 | * Read xattr value from the EA inode. |
e50e5129 AD |
541 | */ |
542 | static int | |
b9fc761e TE |
543 | ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, |
544 | void *buffer, size_t size) | |
e50e5129 | 545 | { |
dec214d0 | 546 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); |
bab79b04 | 547 | struct inode *ea_inode; |
dec214d0 | 548 | int err; |
e50e5129 | 549 | |
b9fc761e | 550 | err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), |
a6d05676 | 551 | le32_to_cpu(entry->e_hash), &ea_inode); |
dec214d0 TE |
552 | if (err) { |
553 | ea_inode = NULL; | |
554 | goto out; | |
555 | } | |
e50e5129 | 556 | |
dec214d0 TE |
557 | if (i_size_read(ea_inode) != size) { |
558 | ext4_warning_inode(ea_inode, | |
559 | "ea_inode file size=%llu entry size=%zu", | |
560 | i_size_read(ea_inode), size); | |
561 | err = -EFSCORRUPTED; | |
562 | goto out; | |
563 | } | |
e50e5129 | 564 | |
dec214d0 TE |
565 | err = ext4_xattr_inode_read(ea_inode, buffer, size); |
566 | if (err) | |
567 | goto out; | |
568 | ||
a6d05676 TE |
569 | if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { |
570 | err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, | |
571 | size); | |
572 | if (err) { | |
dec214d0 TE |
573 | ext4_warning_inode(ea_inode, |
574 | "EA inode hash validation failed"); | |
575 | goto out; | |
576 | } | |
dec214d0 | 577 | |
a6d05676 TE |
578 | if (ea_inode_cache) |
579 | mb_cache_entry_create(ea_inode_cache, GFP_NOFS, | |
580 | ext4_xattr_inode_get_hash(ea_inode), | |
581 | ea_inode->i_ino, true /* reusable */); | |
582 | } | |
dec214d0 TE |
583 | out: |
584 | iput(ea_inode); | |
585 | return err; | |
e50e5129 AD |
586 | } |
587 | ||
ac27a0ec | 588 | static int |
617ba13b | 589 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
590 | void *buffer, size_t buffer_size) |
591 | { | |
592 | struct buffer_head *bh = NULL; | |
617ba13b | 593 | struct ext4_xattr_entry *entry; |
ac27a0ec | 594 | size_t size; |
9496005d | 595 | void *end; |
ac27a0ec | 596 | int error; |
47387409 | 597 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec DK |
598 | |
599 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
600 | name_index, name, buffer, (long)buffer_size); | |
601 | ||
617ba13b | 602 | if (!EXT4_I(inode)->i_file_acl) |
fb265c9c | 603 | return -ENODATA; |
ace36ad4 JP |
604 | ea_idebug(inode, "reading block %llu", |
605 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
fb265c9c TT |
606 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
607 | if (IS_ERR(bh)) | |
608 | return PTR_ERR(bh); | |
ac27a0ec DK |
609 | ea_bdebug(bh, "b_count=%d, refcount=%d", |
610 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
de05ca85 TT |
611 | error = ext4_xattr_check_block(inode, bh); |
612 | if (error) | |
ac27a0ec | 613 | goto cleanup; |
47387409 | 614 | ext4_xattr_block_cache_insert(ea_block_cache, bh); |
ac27a0ec | 615 | entry = BFIRST(bh); |
9496005d TT |
616 | end = bh->b_data + bh->b_size; |
617 | error = xattr_find_entry(inode, &entry, end, name_index, name, 1); | |
ac27a0ec DK |
618 | if (error) |
619 | goto cleanup; | |
620 | size = le32_to_cpu(entry->e_value_size); | |
54dd0e0a TT |
621 | error = -ERANGE; |
622 | if (unlikely(size > EXT4_XATTR_SIZE_MAX)) | |
623 | goto cleanup; | |
ac27a0ec | 624 | if (buffer) { |
ac27a0ec DK |
625 | if (size > buffer_size) |
626 | goto cleanup; | |
e50e5129 | 627 | if (entry->e_value_inum) { |
b9fc761e TE |
628 | error = ext4_xattr_inode_get(inode, entry, buffer, |
629 | size); | |
e50e5129 AD |
630 | if (error) |
631 | goto cleanup; | |
632 | } else { | |
54dd0e0a TT |
633 | u16 offset = le16_to_cpu(entry->e_value_offs); |
634 | void *p = bh->b_data + offset; | |
635 | ||
636 | if (unlikely(p + size > end)) | |
637 | goto cleanup; | |
638 | memcpy(buffer, p, size); | |
e50e5129 | 639 | } |
ac27a0ec DK |
640 | } |
641 | error = size; | |
642 | ||
643 | cleanup: | |
644 | brelse(bh); | |
645 | return error; | |
646 | } | |
647 | ||
879b3825 | 648 | int |
617ba13b | 649 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
650 | void *buffer, size_t buffer_size) |
651 | { | |
617ba13b MC |
652 | struct ext4_xattr_ibody_header *header; |
653 | struct ext4_xattr_entry *entry; | |
654 | struct ext4_inode *raw_inode; | |
655 | struct ext4_iloc iloc; | |
ac27a0ec DK |
656 | size_t size; |
657 | void *end; | |
658 | int error; | |
659 | ||
19f5fb7a | 660 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 661 | return -ENODATA; |
617ba13b | 662 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
663 | if (error) |
664 | return error; | |
617ba13b | 665 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 666 | header = IHDR(inode, raw_inode); |
617ba13b | 667 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 668 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
669 | if (error) |
670 | goto cleanup; | |
6ba644b9 | 671 | entry = IFIRST(header); |
9496005d | 672 | error = xattr_find_entry(inode, &entry, end, name_index, name, 0); |
ac27a0ec DK |
673 | if (error) |
674 | goto cleanup; | |
675 | size = le32_to_cpu(entry->e_value_size); | |
54dd0e0a TT |
676 | error = -ERANGE; |
677 | if (unlikely(size > EXT4_XATTR_SIZE_MAX)) | |
678 | goto cleanup; | |
ac27a0ec | 679 | if (buffer) { |
ac27a0ec DK |
680 | if (size > buffer_size) |
681 | goto cleanup; | |
e50e5129 | 682 | if (entry->e_value_inum) { |
b9fc761e TE |
683 | error = ext4_xattr_inode_get(inode, entry, buffer, |
684 | size); | |
e50e5129 AD |
685 | if (error) |
686 | goto cleanup; | |
687 | } else { | |
54dd0e0a TT |
688 | u16 offset = le16_to_cpu(entry->e_value_offs); |
689 | void *p = (void *)IFIRST(header) + offset; | |
690 | ||
691 | if (unlikely(p + size > end)) | |
692 | goto cleanup; | |
693 | memcpy(buffer, p, size); | |
e50e5129 | 694 | } |
ac27a0ec DK |
695 | } |
696 | error = size; | |
697 | ||
698 | cleanup: | |
699 | brelse(iloc.bh); | |
700 | return error; | |
701 | } | |
702 | ||
703 | /* | |
617ba13b | 704 | * ext4_xattr_get() |
ac27a0ec DK |
705 | * |
706 | * Copy an extended attribute into the buffer | |
707 | * provided, or compute the buffer size required. | |
708 | * Buffer is NULL to compute the size of the buffer required. | |
709 | * | |
710 | * Returns a negative error number on failure, or the number of bytes | |
711 | * used / required on success. | |
712 | */ | |
713 | int | |
617ba13b | 714 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
715 | void *buffer, size_t buffer_size) |
716 | { | |
717 | int error; | |
718 | ||
0db1ff22 TT |
719 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
720 | return -EIO; | |
721 | ||
230b8c1a ZZ |
722 | if (strlen(name) > 255) |
723 | return -ERANGE; | |
724 | ||
617ba13b MC |
725 | down_read(&EXT4_I(inode)->xattr_sem); |
726 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
727 | buffer_size); |
728 | if (error == -ENODATA) | |
617ba13b | 729 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 730 | buffer_size); |
617ba13b | 731 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
732 | return error; |
733 | } | |
734 | ||
735 | static int | |
431547b3 | 736 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
737 | char *buffer, size_t buffer_size) |
738 | { | |
739 | size_t rest = buffer_size; | |
740 | ||
617ba13b | 741 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 742 | const struct xattr_handler *handler = |
617ba13b | 743 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec | 744 | |
764a5c6b AG |
745 | if (handler && (!handler->list || handler->list(dentry))) { |
746 | const char *prefix = handler->prefix ?: handler->name; | |
747 | size_t prefix_len = strlen(prefix); | |
748 | size_t size = prefix_len + entry->e_name_len + 1; | |
749 | ||
ac27a0ec DK |
750 | if (buffer) { |
751 | if (size > rest) | |
752 | return -ERANGE; | |
764a5c6b AG |
753 | memcpy(buffer, prefix, prefix_len); |
754 | buffer += prefix_len; | |
755 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
756 | buffer += entry->e_name_len; | |
757 | *buffer++ = 0; | |
ac27a0ec DK |
758 | } |
759 | rest -= size; | |
760 | } | |
761 | } | |
764a5c6b | 762 | return buffer_size - rest; /* total size */ |
ac27a0ec DK |
763 | } |
764 | ||
765 | static int | |
431547b3 | 766 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 767 | { |
2b0143b5 | 768 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
769 | struct buffer_head *bh = NULL; |
770 | int error; | |
771 | ||
772 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
773 | buffer, (long)buffer_size); | |
774 | ||
617ba13b | 775 | if (!EXT4_I(inode)->i_file_acl) |
fb265c9c | 776 | return 0; |
ace36ad4 JP |
777 | ea_idebug(inode, "reading block %llu", |
778 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
fb265c9c TT |
779 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
780 | if (IS_ERR(bh)) | |
781 | return PTR_ERR(bh); | |
ac27a0ec DK |
782 | ea_bdebug(bh, "b_count=%d, refcount=%d", |
783 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
de05ca85 TT |
784 | error = ext4_xattr_check_block(inode, bh); |
785 | if (error) | |
ac27a0ec | 786 | goto cleanup; |
47387409 | 787 | ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); |
fb265c9c TT |
788 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, |
789 | buffer_size); | |
ac27a0ec DK |
790 | cleanup: |
791 | brelse(bh); | |
ac27a0ec DK |
792 | return error; |
793 | } | |
794 | ||
795 | static int | |
431547b3 | 796 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 797 | { |
2b0143b5 | 798 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
799 | struct ext4_xattr_ibody_header *header; |
800 | struct ext4_inode *raw_inode; | |
801 | struct ext4_iloc iloc; | |
ac27a0ec DK |
802 | void *end; |
803 | int error; | |
804 | ||
19f5fb7a | 805 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 806 | return 0; |
617ba13b | 807 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
808 | if (error) |
809 | return error; | |
617ba13b | 810 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 811 | header = IHDR(inode, raw_inode); |
617ba13b | 812 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 813 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
814 | if (error) |
815 | goto cleanup; | |
431547b3 | 816 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
817 | buffer, buffer_size); |
818 | ||
819 | cleanup: | |
820 | brelse(iloc.bh); | |
821 | return error; | |
822 | } | |
823 | ||
824 | /* | |
ba7ea1d8 EB |
825 | * Inode operation listxattr() |
826 | * | |
827 | * d_inode(dentry)->i_rwsem: don't care | |
ac27a0ec DK |
828 | * |
829 | * Copy a list of attribute names into the buffer | |
830 | * provided, or compute the buffer size required. | |
831 | * Buffer is NULL to compute the size of the buffer required. | |
832 | * | |
833 | * Returns a negative error number on failure, or the number of bytes | |
834 | * used / required on success. | |
835 | */ | |
ba7ea1d8 EB |
836 | ssize_t |
837 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
ac27a0ec | 838 | { |
eaeef867 | 839 | int ret, ret2; |
ac27a0ec | 840 | |
2b0143b5 | 841 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
842 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
843 | if (ret < 0) | |
844 | goto errout; | |
845 | if (buffer) { | |
846 | buffer += ret; | |
847 | buffer_size -= ret; | |
ac27a0ec | 848 | } |
eaeef867 TT |
849 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
850 | if (ret < 0) | |
851 | goto errout; | |
852 | ret += ret2; | |
853 | errout: | |
2b0143b5 | 854 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 855 | return ret; |
ac27a0ec DK |
856 | } |
857 | ||
858 | /* | |
617ba13b | 859 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
860 | * not set, set it. |
861 | */ | |
617ba13b | 862 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
863 | struct super_block *sb) |
864 | { | |
e2b911c5 | 865 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
866 | return; |
867 | ||
5d601255 | 868 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
188c299e JK |
869 | if (ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, |
870 | EXT4_JTR_NONE) == 0) { | |
05c2c00f | 871 | lock_buffer(EXT4_SB(sb)->s_sbh); |
e2b911c5 | 872 | ext4_set_feature_xattr(sb); |
05c2c00f JK |
873 | ext4_superblock_csum_set(sb); |
874 | unlock_buffer(EXT4_SB(sb)->s_sbh); | |
a3f5cf14 | 875 | ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); |
ac27a0ec | 876 | } |
ac27a0ec DK |
877 | } |
878 | ||
7a9ca53a TE |
879 | int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) |
880 | { | |
881 | struct ext4_iloc iloc = { .bh = NULL }; | |
882 | struct buffer_head *bh = NULL; | |
883 | struct ext4_inode *raw_inode; | |
884 | struct ext4_xattr_ibody_header *header; | |
885 | struct ext4_xattr_entry *entry; | |
886 | qsize_t ea_inode_refs = 0; | |
887 | void *end; | |
888 | int ret; | |
889 | ||
890 | lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); | |
891 | ||
892 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
893 | ret = ext4_get_inode_loc(inode, &iloc); | |
894 | if (ret) | |
895 | goto out; | |
896 | raw_inode = ext4_raw_inode(&iloc); | |
897 | header = IHDR(inode, raw_inode); | |
898 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
899 | ret = xattr_check_inode(inode, header, end); | |
900 | if (ret) | |
901 | goto out; | |
902 | ||
903 | for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); | |
904 | entry = EXT4_XATTR_NEXT(entry)) | |
905 | if (entry->e_value_inum) | |
906 | ea_inode_refs++; | |
907 | } | |
908 | ||
909 | if (EXT4_I(inode)->i_file_acl) { | |
fb265c9c TT |
910 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
911 | if (IS_ERR(bh)) { | |
912 | ret = PTR_ERR(bh); | |
7159a986 | 913 | bh = NULL; |
7a9ca53a TE |
914 | goto out; |
915 | } | |
916 | ||
de05ca85 TT |
917 | ret = ext4_xattr_check_block(inode, bh); |
918 | if (ret) | |
7a9ca53a | 919 | goto out; |
7a9ca53a TE |
920 | |
921 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
922 | entry = EXT4_XATTR_NEXT(entry)) | |
923 | if (entry->e_value_inum) | |
924 | ea_inode_refs++; | |
925 | } | |
926 | *usage = ea_inode_refs + 1; | |
927 | ret = 0; | |
928 | out: | |
929 | brelse(iloc.bh); | |
930 | brelse(bh); | |
931 | return ret; | |
932 | } | |
933 | ||
dec214d0 TE |
934 | static inline size_t round_up_cluster(struct inode *inode, size_t length) |
935 | { | |
936 | struct super_block *sb = inode->i_sb; | |
937 | size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + | |
938 | inode->i_blkbits); | |
939 | size_t mask = ~(cluster_size - 1); | |
940 | ||
941 | return (length + cluster_size - 1) & mask; | |
942 | } | |
943 | ||
944 | static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) | |
945 | { | |
946 | int err; | |
947 | ||
948 | err = dquot_alloc_inode(inode); | |
949 | if (err) | |
950 | return err; | |
951 | err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); | |
952 | if (err) | |
953 | dquot_free_inode(inode); | |
954 | return err; | |
955 | } | |
956 | ||
a6d05676 TE |
957 | static void ext4_xattr_inode_free_quota(struct inode *parent, |
958 | struct inode *ea_inode, | |
959 | size_t len) | |
dec214d0 | 960 | { |
a6d05676 TE |
961 | if (ea_inode && |
962 | ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) | |
963 | return; | |
964 | dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); | |
965 | dquot_free_inode(parent); | |
dec214d0 TE |
966 | } |
967 | ||
af65207c TE |
968 | int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, |
969 | struct buffer_head *block_bh, size_t value_len, | |
970 | bool is_create) | |
dec214d0 | 971 | { |
dec214d0 TE |
972 | int credits; |
973 | int blocks; | |
974 | ||
975 | /* | |
976 | * 1) Owner inode update | |
977 | * 2) Ref count update on old xattr block | |
978 | * 3) new xattr block | |
979 | * 4) block bitmap update for new xattr block | |
980 | * 5) group descriptor for new xattr block | |
981 | * 6) block bitmap update for old xattr block | |
982 | * 7) group descriptor for old block | |
983 | * | |
984 | * 6 & 7 can happen if we have two racing threads T_a and T_b | |
985 | * which are each trying to set an xattr on inodes I_a and I_b | |
986 | * which were both initially sharing an xattr block. | |
987 | */ | |
988 | credits = 7; | |
989 | ||
990 | /* Quota updates. */ | |
991 | credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); | |
992 | ||
993 | /* | |
994 | * In case of inline data, we may push out the data to a block, | |
995 | * so we need to reserve credits for this eventuality | |
996 | */ | |
af65207c | 997 | if (inode && ext4_has_inline_data(inode)) |
dec214d0 TE |
998 | credits += ext4_writepage_trans_blocks(inode) + 1; |
999 | ||
1000 | /* We are done if ea_inode feature is not enabled. */ | |
1001 | if (!ext4_has_feature_ea_inode(sb)) | |
1002 | return credits; | |
1003 | ||
1004 | /* New ea_inode, inode map, block bitmap, group descriptor. */ | |
1005 | credits += 4; | |
1006 | ||
1007 | /* Data blocks. */ | |
1008 | blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; | |
1009 | ||
1010 | /* Indirection block or one level of extent tree. */ | |
1011 | blocks += 1; | |
1012 | ||
1013 | /* Block bitmap and group descriptor updates for each block. */ | |
1014 | credits += blocks * 2; | |
1015 | ||
1016 | /* Blocks themselves. */ | |
1017 | credits += blocks; | |
1018 | ||
af65207c TE |
1019 | if (!is_create) { |
1020 | /* Dereference ea_inode holding old xattr value. | |
1021 | * Old ea_inode, inode map, block bitmap, group descriptor. | |
1022 | */ | |
1023 | credits += 4; | |
dec214d0 | 1024 | |
af65207c TE |
1025 | /* Data blocks for old ea_inode. */ |
1026 | blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; | |
dec214d0 | 1027 | |
af65207c TE |
1028 | /* Indirection block or one level of extent tree for old |
1029 | * ea_inode. | |
1030 | */ | |
1031 | blocks += 1; | |
dec214d0 | 1032 | |
af65207c TE |
1033 | /* Block bitmap and group descriptor updates for each block. */ |
1034 | credits += blocks * 2; | |
1035 | } | |
dec214d0 TE |
1036 | |
1037 | /* We may need to clone the existing xattr block in which case we need | |
1038 | * to increment ref counts for existing ea_inodes referenced by it. | |
1039 | */ | |
1040 | if (block_bh) { | |
1041 | struct ext4_xattr_entry *entry = BFIRST(block_bh); | |
1042 | ||
1043 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) | |
1044 | if (entry->e_value_inum) | |
1045 | /* Ref count update on ea_inode. */ | |
1046 | credits += 1; | |
1047 | } | |
1048 | return credits; | |
1049 | } | |
1050 | ||
dec214d0 TE |
1051 | static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, |
1052 | int ref_change) | |
1053 | { | |
dec214d0 TE |
1054 | struct ext4_iloc iloc; |
1055 | s64 ref_count; | |
dec214d0 TE |
1056 | int ret; |
1057 | ||
1058 | inode_lock(ea_inode); | |
1059 | ||
1060 | ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); | |
1bfc204d | 1061 | if (ret) |
dec214d0 | 1062 | goto out; |
dec214d0 TE |
1063 | |
1064 | ref_count = ext4_xattr_inode_get_ref(ea_inode); | |
1065 | ref_count += ref_change; | |
1066 | ext4_xattr_inode_set_ref(ea_inode, ref_count); | |
1067 | ||
1068 | if (ref_change > 0) { | |
1069 | WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", | |
1070 | ea_inode->i_ino, ref_count); | |
1071 | ||
1072 | if (ref_count == 1) { | |
1073 | WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", | |
1074 | ea_inode->i_ino, ea_inode->i_nlink); | |
1075 | ||
1076 | set_nlink(ea_inode, 1); | |
1077 | ext4_orphan_del(handle, ea_inode); | |
dec214d0 TE |
1078 | } |
1079 | } else { | |
1080 | WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", | |
1081 | ea_inode->i_ino, ref_count); | |
1082 | ||
1083 | if (ref_count == 0) { | |
1084 | WARN_ONCE(ea_inode->i_nlink != 1, | |
1085 | "EA inode %lu i_nlink=%u", | |
1086 | ea_inode->i_ino, ea_inode->i_nlink); | |
1087 | ||
1088 | clear_nlink(ea_inode); | |
1089 | ext4_orphan_add(handle, ea_inode); | |
dec214d0 TE |
1090 | } |
1091 | } | |
1092 | ||
1093 | ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); | |
dec214d0 TE |
1094 | if (ret) |
1095 | ext4_warning_inode(ea_inode, | |
1096 | "ext4_mark_iloc_dirty() failed ret=%d", ret); | |
1097 | out: | |
dec214d0 TE |
1098 | inode_unlock(ea_inode); |
1099 | return ret; | |
1100 | } | |
1101 | ||
1102 | static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) | |
1103 | { | |
1104 | return ext4_xattr_inode_update_ref(handle, ea_inode, 1); | |
1105 | } | |
1106 | ||
1107 | static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) | |
1108 | { | |
1109 | return ext4_xattr_inode_update_ref(handle, ea_inode, -1); | |
1110 | } | |
1111 | ||
1112 | static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, | |
1113 | struct ext4_xattr_entry *first) | |
1114 | { | |
1115 | struct inode *ea_inode; | |
1116 | struct ext4_xattr_entry *entry; | |
1117 | struct ext4_xattr_entry *failed_entry; | |
1118 | unsigned int ea_ino; | |
1119 | int err, saved_err; | |
1120 | ||
1121 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1122 | entry = EXT4_XATTR_NEXT(entry)) { | |
1123 | if (!entry->e_value_inum) | |
1124 | continue; | |
1125 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1126 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1127 | le32_to_cpu(entry->e_hash), | |
1128 | &ea_inode); | |
dec214d0 TE |
1129 | if (err) |
1130 | goto cleanup; | |
1131 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1132 | if (err) { | |
1133 | ext4_warning_inode(ea_inode, "inc ref error %d", err); | |
1134 | iput(ea_inode); | |
1135 | goto cleanup; | |
1136 | } | |
1137 | iput(ea_inode); | |
1138 | } | |
1139 | return 0; | |
1140 | ||
1141 | cleanup: | |
1142 | saved_err = err; | |
1143 | failed_entry = entry; | |
1144 | ||
1145 | for (entry = first; entry != failed_entry; | |
1146 | entry = EXT4_XATTR_NEXT(entry)) { | |
1147 | if (!entry->e_value_inum) | |
1148 | continue; | |
1149 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1150 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1151 | le32_to_cpu(entry->e_hash), | |
1152 | &ea_inode); | |
dec214d0 TE |
1153 | if (err) { |
1154 | ext4_warning(parent->i_sb, | |
1155 | "cleanup ea_ino %u iget error %d", ea_ino, | |
1156 | err); | |
1157 | continue; | |
1158 | } | |
1159 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1160 | if (err) | |
1161 | ext4_warning_inode(ea_inode, "cleanup dec ref error %d", | |
1162 | err); | |
1163 | iput(ea_inode); | |
1164 | } | |
1165 | return saved_err; | |
1166 | } | |
1167 | ||
a4130367 JK |
1168 | static int ext4_xattr_restart_fn(handle_t *handle, struct inode *inode, |
1169 | struct buffer_head *bh, bool block_csum, bool dirty) | |
1170 | { | |
1171 | int error; | |
1172 | ||
1173 | if (bh && dirty) { | |
1174 | if (block_csum) | |
1175 | ext4_xattr_block_csum_set(inode, bh); | |
1176 | error = ext4_handle_dirty_metadata(handle, NULL, bh); | |
1177 | if (error) { | |
1178 | ext4_warning(inode->i_sb, "Handle metadata (error %d)", | |
1179 | error); | |
1180 | return error; | |
1181 | } | |
1182 | } | |
1183 | return 0; | |
1184 | } | |
1185 | ||
30a7eb97 | 1186 | static void |
dec214d0 TE |
1187 | ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, |
1188 | struct buffer_head *bh, | |
1189 | struct ext4_xattr_entry *first, bool block_csum, | |
1190 | struct ext4_xattr_inode_array **ea_inode_array, | |
1191 | int extra_credits, bool skip_quota) | |
30a7eb97 TE |
1192 | { |
1193 | struct inode *ea_inode; | |
1194 | struct ext4_xattr_entry *entry; | |
1195 | bool dirty = false; | |
1196 | unsigned int ea_ino; | |
1197 | int err; | |
1198 | int credits; | |
1199 | ||
1200 | /* One credit for dec ref on ea_inode, one for orphan list addition, */ | |
1201 | credits = 2 + extra_credits; | |
1202 | ||
1203 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1204 | entry = EXT4_XATTR_NEXT(entry)) { | |
1205 | if (!entry->e_value_inum) | |
1206 | continue; | |
1207 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1208 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1209 | le32_to_cpu(entry->e_hash), | |
1210 | &ea_inode); | |
30a7eb97 TE |
1211 | if (err) |
1212 | continue; | |
1213 | ||
1214 | err = ext4_expand_inode_array(ea_inode_array, ea_inode); | |
1215 | if (err) { | |
1216 | ext4_warning_inode(ea_inode, | |
1217 | "Expand inode array err=%d", err); | |
1218 | iput(ea_inode); | |
1219 | continue; | |
1220 | } | |
1221 | ||
a4130367 | 1222 | err = ext4_journal_ensure_credits_fn(handle, credits, credits, |
83448bdf | 1223 | ext4_free_metadata_revoke_credits(parent->i_sb, 1), |
a4130367 JK |
1224 | ext4_xattr_restart_fn(handle, parent, bh, block_csum, |
1225 | dirty)); | |
1226 | if (err < 0) { | |
30a7eb97 TE |
1227 | ext4_warning_inode(ea_inode, "Ensure credits err=%d", |
1228 | err); | |
1229 | continue; | |
1230 | } | |
a4130367 | 1231 | if (err > 0) { |
188c299e JK |
1232 | err = ext4_journal_get_write_access(handle, |
1233 | parent->i_sb, bh, EXT4_JTR_NONE); | |
a4130367 JK |
1234 | if (err) { |
1235 | ext4_warning_inode(ea_inode, | |
1236 | "Re-get write access err=%d", | |
1237 | err); | |
1238 | continue; | |
1239 | } | |
1240 | } | |
30a7eb97 | 1241 | |
dec214d0 TE |
1242 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); |
1243 | if (err) { | |
1244 | ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", | |
1245 | err); | |
1246 | continue; | |
1247 | } | |
1248 | ||
1249 | if (!skip_quota) | |
a6d05676 | 1250 | ext4_xattr_inode_free_quota(parent, ea_inode, |
dec214d0 | 1251 | le32_to_cpu(entry->e_value_size)); |
30a7eb97 TE |
1252 | |
1253 | /* | |
1254 | * Forget about ea_inode within the same transaction that | |
1255 | * decrements the ref count. This avoids duplicate decrements in | |
1256 | * case the rest of the work spills over to subsequent | |
1257 | * transactions. | |
1258 | */ | |
1259 | entry->e_value_inum = 0; | |
1260 | entry->e_value_size = 0; | |
1261 | ||
1262 | dirty = true; | |
1263 | } | |
1264 | ||
1265 | if (dirty) { | |
1266 | /* | |
1267 | * Note that we are deliberately skipping csum calculation for | |
1268 | * the final update because we do not expect any journal | |
1269 | * restarts until xattr block is freed. | |
1270 | */ | |
1271 | ||
1272 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
1273 | if (err) | |
1274 | ext4_warning_inode(parent, | |
1275 | "handle dirty metadata err=%d", err); | |
1276 | } | |
1277 | } | |
1278 | ||
ac27a0ec | 1279 | /* |
ec4cb1aa JK |
1280 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
1281 | * otherwise free the block. | |
ac27a0ec DK |
1282 | */ |
1283 | static void | |
617ba13b | 1284 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
dec214d0 TE |
1285 | struct buffer_head *bh, |
1286 | struct ext4_xattr_inode_array **ea_inode_array, | |
1287 | int extra_credits) | |
ac27a0ec | 1288 | { |
47387409 | 1289 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
6048c64b | 1290 | u32 hash, ref; |
8a2bfdcb | 1291 | int error = 0; |
ac27a0ec | 1292 | |
5d601255 | 1293 | BUFFER_TRACE(bh, "get_write_access"); |
188c299e JK |
1294 | error = ext4_journal_get_write_access(handle, inode->i_sb, bh, |
1295 | EXT4_JTR_NONE); | |
8a2bfdcb MC |
1296 | if (error) |
1297 | goto out; | |
1298 | ||
65f8b800 | 1299 | retry_ref: |
8a2bfdcb | 1300 | lock_buffer(bh); |
6048c64b AG |
1301 | hash = le32_to_cpu(BHDR(bh)->h_hash); |
1302 | ref = le32_to_cpu(BHDR(bh)->h_refcount); | |
1303 | if (ref == 1) { | |
ac27a0ec | 1304 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
1305 | /* |
1306 | * This must happen under buffer lock for | |
1307 | * ext4_xattr_block_set() to reliably detect freed block | |
1308 | */ | |
65f8b800 JK |
1309 | if (ea_block_cache) { |
1310 | struct mb_cache_entry *oe; | |
1311 | ||
1312 | oe = mb_cache_entry_delete_or_get(ea_block_cache, hash, | |
1313 | bh->b_blocknr); | |
1314 | if (oe) { | |
1315 | unlock_buffer(bh); | |
1316 | mb_cache_entry_wait_unused(oe); | |
1317 | mb_cache_entry_put(ea_block_cache, oe); | |
1318 | goto retry_ref; | |
1319 | } | |
1320 | } | |
ac27a0ec | 1321 | get_bh(bh); |
ec4cb1aa | 1322 | unlock_buffer(bh); |
dec214d0 TE |
1323 | |
1324 | if (ext4_has_feature_ea_inode(inode->i_sb)) | |
1325 | ext4_xattr_inode_dec_ref_all(handle, inode, bh, | |
1326 | BFIRST(bh), | |
1327 | true /* block_csum */, | |
1328 | ea_inode_array, | |
1329 | extra_credits, | |
1330 | true /* skip_quota */); | |
e6362609 TT |
1331 | ext4_free_blocks(handle, inode, bh, 0, 1, |
1332 | EXT4_FREE_BLOCKS_METADATA | | |
1333 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 1334 | } else { |
6048c64b AG |
1335 | ref--; |
1336 | BHDR(bh)->h_refcount = cpu_to_le32(ref); | |
1337 | if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { | |
1338 | struct mb_cache_entry *ce; | |
1339 | ||
cdb7ee4c TE |
1340 | if (ea_block_cache) { |
1341 | ce = mb_cache_entry_get(ea_block_cache, hash, | |
1342 | bh->b_blocknr); | |
1343 | if (ce) { | |
a44e84a9 | 1344 | set_bit(MBE_REUSABLE_B, &ce->e_flags); |
cdb7ee4c TE |
1345 | mb_cache_entry_put(ea_block_cache, ce); |
1346 | } | |
6048c64b AG |
1347 | } |
1348 | } | |
1349 | ||
dac7a4b4 | 1350 | ext4_xattr_block_csum_set(inode, bh); |
ec4cb1aa JK |
1351 | /* |
1352 | * Beware of this ugliness: Releasing of xattr block references | |
1353 | * from different inodes can race and so we have to protect | |
1354 | * from a race where someone else frees the block (and releases | |
1355 | * its journal_head) before we are done dirtying the buffer. In | |
1356 | * nojournal mode this race is harmless and we actually cannot | |
dac7a4b4 | 1357 | * call ext4_handle_dirty_metadata() with locked buffer as |
ec4cb1aa JK |
1358 | * that function can call sync_dirty_buffer() so for that case |
1359 | * we handle the dirtying after unlocking the buffer. | |
1360 | */ | |
1361 | if (ext4_handle_valid(handle)) | |
dac7a4b4 | 1362 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
c1bb05a6 | 1363 | unlock_buffer(bh); |
ec4cb1aa | 1364 | if (!ext4_handle_valid(handle)) |
dac7a4b4 | 1365 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
8a2bfdcb | 1366 | if (IS_SYNC(inode)) |
0390131b | 1367 | ext4_handle_sync(handle); |
1231b3a1 | 1368 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
1369 | ea_bdebug(bh, "refcount now=%d; releasing", |
1370 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 1371 | } |
8a2bfdcb MC |
1372 | out: |
1373 | ext4_std_error(inode->i_sb, error); | |
1374 | return; | |
ac27a0ec DK |
1375 | } |
1376 | ||
6dd4ee7c KS |
1377 | /* |
1378 | * Find the available free space for EAs. This also returns the total number of | |
1379 | * bytes used by EA entries. | |
1380 | */ | |
1381 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
1382 | size_t *min_offs, void *base, int *total) | |
1383 | { | |
1384 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 1385 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
1386 | size_t offs = le16_to_cpu(last->e_value_offs); |
1387 | if (offs < *min_offs) | |
1388 | *min_offs = offs; | |
1389 | } | |
7b1b2c1b TT |
1390 | if (total) |
1391 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
1392 | } |
1393 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
1394 | } | |
1395 | ||
e50e5129 AD |
1396 | /* |
1397 | * Write the value of the EA in an inode. | |
1398 | */ | |
1399 | static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, | |
1400 | const void *buf, int bufsize) | |
1401 | { | |
1402 | struct buffer_head *bh = NULL; | |
1403 | unsigned long block = 0; | |
dec214d0 TE |
1404 | int blocksize = ea_inode->i_sb->s_blocksize; |
1405 | int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; | |
e50e5129 | 1406 | int csize, wsize = 0; |
4209ae12 | 1407 | int ret = 0, ret2 = 0; |
e50e5129 AD |
1408 | int retries = 0; |
1409 | ||
1410 | retry: | |
1411 | while (ret >= 0 && ret < max_blocks) { | |
1412 | struct ext4_map_blocks map; | |
1413 | map.m_lblk = block += ret; | |
1414 | map.m_len = max_blocks -= ret; | |
1415 | ||
1416 | ret = ext4_map_blocks(handle, ea_inode, &map, | |
1417 | EXT4_GET_BLOCKS_CREATE); | |
1418 | if (ret <= 0) { | |
1419 | ext4_mark_inode_dirty(handle, ea_inode); | |
1420 | if (ret == -ENOSPC && | |
1421 | ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { | |
1422 | ret = 0; | |
1423 | goto retry; | |
1424 | } | |
1425 | break; | |
1426 | } | |
1427 | } | |
1428 | ||
1429 | if (ret < 0) | |
1430 | return ret; | |
1431 | ||
1432 | block = 0; | |
1433 | while (wsize < bufsize) { | |
e0f49d27 | 1434 | brelse(bh); |
e50e5129 AD |
1435 | csize = (bufsize - wsize) > blocksize ? blocksize : |
1436 | bufsize - wsize; | |
1437 | bh = ext4_getblk(handle, ea_inode, block, 0); | |
1438 | if (IS_ERR(bh)) | |
1439 | return PTR_ERR(bh); | |
eb6984fa VA |
1440 | if (!bh) { |
1441 | WARN_ON_ONCE(1); | |
1442 | EXT4_ERROR_INODE(ea_inode, | |
1443 | "ext4_getblk() return bh = NULL"); | |
1444 | return -EFSCORRUPTED; | |
1445 | } | |
188c299e JK |
1446 | ret = ext4_journal_get_write_access(handle, ea_inode->i_sb, bh, |
1447 | EXT4_JTR_NONE); | |
e50e5129 AD |
1448 | if (ret) |
1449 | goto out; | |
1450 | ||
1451 | memcpy(bh->b_data, buf, csize); | |
1452 | set_buffer_uptodate(bh); | |
1453 | ext4_handle_dirty_metadata(handle, ea_inode, bh); | |
1454 | ||
1455 | buf += csize; | |
1456 | wsize += csize; | |
1457 | block += 1; | |
1458 | } | |
1459 | ||
1460 | inode_lock(ea_inode); | |
1461 | i_size_write(ea_inode, wsize); | |
1462 | ext4_update_i_disksize(ea_inode, wsize); | |
1463 | inode_unlock(ea_inode); | |
1464 | ||
4209ae12 HS |
1465 | ret2 = ext4_mark_inode_dirty(handle, ea_inode); |
1466 | if (unlikely(ret2 && !ret)) | |
1467 | ret = ret2; | |
e50e5129 AD |
1468 | |
1469 | out: | |
1470 | brelse(bh); | |
1471 | ||
1472 | return ret; | |
1473 | } | |
1474 | ||
1475 | /* | |
1476 | * Create an inode to store the value of a large EA. | |
1477 | */ | |
1478 | static struct inode *ext4_xattr_inode_create(handle_t *handle, | |
dec214d0 | 1479 | struct inode *inode, u32 hash) |
e50e5129 AD |
1480 | { |
1481 | struct inode *ea_inode = NULL; | |
9e1ba001 | 1482 | uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; |
bd3b963b | 1483 | int err; |
e50e5129 | 1484 | |
f31173c1 JN |
1485 | if (inode->i_sb->s_root == NULL) { |
1486 | ext4_warning(inode->i_sb, | |
1487 | "refuse to create EA inode when umounting"); | |
1488 | WARN_ON(1); | |
1489 | return ERR_PTR(-EINVAL); | |
1490 | } | |
1491 | ||
e50e5129 AD |
1492 | /* |
1493 | * Let the next inode be the goal, so we try and allocate the EA inode | |
1494 | * in the same group, or nearby one. | |
1495 | */ | |
1496 | ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, | |
9e1ba001 | 1497 | S_IFREG | 0600, NULL, inode->i_ino + 1, owner, |
1b917ed8 | 1498 | EXT4_EA_INODE_FL); |
e50e5129 AD |
1499 | if (!IS_ERR(ea_inode)) { |
1500 | ea_inode->i_op = &ext4_file_inode_operations; | |
1501 | ea_inode->i_fop = &ext4_file_operations; | |
1502 | ext4_set_aops(ea_inode); | |
33d201e0 | 1503 | ext4_xattr_inode_set_class(ea_inode); |
e50e5129 | 1504 | unlock_new_inode(ea_inode); |
dec214d0 TE |
1505 | ext4_xattr_inode_set_ref(ea_inode, 1); |
1506 | ext4_xattr_inode_set_hash(ea_inode, hash); | |
1507 | err = ext4_mark_inode_dirty(handle, ea_inode); | |
1508 | if (!err) | |
1509 | err = ext4_inode_attach_jinode(ea_inode); | |
bd3b963b | 1510 | if (err) { |
e4db04f7 YB |
1511 | if (ext4_xattr_inode_dec_ref(handle, ea_inode)) |
1512 | ext4_warning_inode(ea_inode, | |
1513 | "cleanup dec ref error %d", err); | |
bd3b963b TE |
1514 | iput(ea_inode); |
1515 | return ERR_PTR(err); | |
1516 | } | |
dec214d0 TE |
1517 | |
1518 | /* | |
1519 | * Xattr inodes are shared therefore quota charging is performed | |
1520 | * at a higher level. | |
1521 | */ | |
1522 | dquot_free_inode(ea_inode); | |
1523 | dquot_drop(ea_inode); | |
1524 | inode_lock(ea_inode); | |
1525 | ea_inode->i_flags |= S_NOQUOTA; | |
1526 | inode_unlock(ea_inode); | |
e50e5129 AD |
1527 | } |
1528 | ||
1529 | return ea_inode; | |
1530 | } | |
1531 | ||
dec214d0 TE |
1532 | static struct inode * |
1533 | ext4_xattr_inode_cache_find(struct inode *inode, const void *value, | |
1534 | size_t value_len, u32 hash) | |
e50e5129 | 1535 | { |
dec214d0 TE |
1536 | struct inode *ea_inode; |
1537 | struct mb_cache_entry *ce; | |
1538 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); | |
1539 | void *ea_data; | |
1540 | ||
cdb7ee4c TE |
1541 | if (!ea_inode_cache) |
1542 | return NULL; | |
1543 | ||
dec214d0 TE |
1544 | ce = mb_cache_entry_find_first(ea_inode_cache, hash); |
1545 | if (!ce) | |
1546 | return NULL; | |
1547 | ||
163f0ec1 JK |
1548 | WARN_ON_ONCE(ext4_handle_valid(journal_current_handle()) && |
1549 | !(current->flags & PF_MEMALLOC_NOFS)); | |
1550 | ||
71b565ce | 1551 | ea_data = kvmalloc(value_len, GFP_KERNEL); |
dec214d0 TE |
1552 | if (!ea_data) { |
1553 | mb_cache_entry_put(ea_inode_cache, ce); | |
1554 | return NULL; | |
1555 | } | |
e50e5129 | 1556 | |
dec214d0 | 1557 | while (ce) { |
8a363970 TT |
1558 | ea_inode = ext4_iget(inode->i_sb, ce->e_value, |
1559 | EXT4_IGET_NORMAL); | |
dec214d0 TE |
1560 | if (!IS_ERR(ea_inode) && |
1561 | !is_bad_inode(ea_inode) && | |
1562 | (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && | |
1563 | i_size_read(ea_inode) == value_len && | |
1564 | !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && | |
b9fc761e TE |
1565 | !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, |
1566 | value_len) && | |
dec214d0 TE |
1567 | !memcmp(value, ea_data, value_len)) { |
1568 | mb_cache_entry_touch(ea_inode_cache, ce); | |
1569 | mb_cache_entry_put(ea_inode_cache, ce); | |
1570 | kvfree(ea_data); | |
1571 | return ea_inode; | |
1572 | } | |
e50e5129 | 1573 | |
dec214d0 TE |
1574 | if (!IS_ERR(ea_inode)) |
1575 | iput(ea_inode); | |
1576 | ce = mb_cache_entry_find_next(ea_inode_cache, ce); | |
1577 | } | |
1578 | kvfree(ea_data); | |
1579 | return NULL; | |
e50e5129 AD |
1580 | } |
1581 | ||
1582 | /* | |
1583 | * Add value of the EA in an inode. | |
1584 | */ | |
dec214d0 TE |
1585 | static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, |
1586 | const void *value, size_t value_len, | |
1587 | struct inode **ret_inode) | |
e50e5129 AD |
1588 | { |
1589 | struct inode *ea_inode; | |
dec214d0 | 1590 | u32 hash; |
e50e5129 AD |
1591 | int err; |
1592 | ||
dec214d0 TE |
1593 | hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); |
1594 | ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); | |
1595 | if (ea_inode) { | |
1596 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1597 | if (err) { | |
1598 | iput(ea_inode); | |
1599 | return err; | |
1600 | } | |
1601 | ||
1602 | *ret_inode = ea_inode; | |
1603 | return 0; | |
1604 | } | |
1605 | ||
e50e5129 | 1606 | /* Create an inode for the EA value */ |
dec214d0 | 1607 | ea_inode = ext4_xattr_inode_create(handle, inode, hash); |
e50e5129 AD |
1608 | if (IS_ERR(ea_inode)) |
1609 | return PTR_ERR(ea_inode); | |
1610 | ||
1611 | err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); | |
dec214d0 | 1612 | if (err) { |
56d0d0b9 LZ |
1613 | if (ext4_xattr_inode_dec_ref(handle, ea_inode)) |
1614 | ext4_warning_inode(ea_inode, "cleanup dec ref error %d", err); | |
dec214d0 TE |
1615 | iput(ea_inode); |
1616 | return err; | |
1617 | } | |
e50e5129 | 1618 | |
cdb7ee4c TE |
1619 | if (EA_INODE_CACHE(inode)) |
1620 | mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, | |
1621 | ea_inode->i_ino, true /* reusable */); | |
e50e5129 | 1622 | |
dec214d0 TE |
1623 | *ret_inode = ea_inode; |
1624 | return 0; | |
e50e5129 AD |
1625 | } |
1626 | ||
9c6e7853 TE |
1627 | /* |
1628 | * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode | |
1629 | * feature is enabled. | |
1630 | */ | |
1631 | #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) | |
1632 | ||
e50e5129 AD |
1633 | static int ext4_xattr_set_entry(struct ext4_xattr_info *i, |
1634 | struct ext4_xattr_search *s, | |
daf83281 TE |
1635 | handle_t *handle, struct inode *inode, |
1636 | bool is_block) | |
ac27a0ec | 1637 | { |
5369a762 | 1638 | struct ext4_xattr_entry *last, *next; |
dec214d0 TE |
1639 | struct ext4_xattr_entry *here = s->here; |
1640 | size_t min_offs = s->end - s->base, name_len = strlen(i->name); | |
e50e5129 | 1641 | int in_inode = i->in_inode; |
dec214d0 TE |
1642 | struct inode *old_ea_inode = NULL; |
1643 | struct inode *new_ea_inode = NULL; | |
1644 | size_t old_size, new_size; | |
1645 | int ret; | |
1646 | ||
1647 | /* Space used by old and new values. */ | |
1648 | old_size = (!s->not_found && !here->e_value_inum) ? | |
1649 | EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; | |
1650 | new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; | |
1651 | ||
1652 | /* | |
1653 | * Optimization for the simple case when old and new values have the | |
1654 | * same padded sizes. Not applicable if external inodes are involved. | |
1655 | */ | |
1656 | if (new_size && new_size == old_size) { | |
1657 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1658 | void *val = s->base + offs; | |
1659 | ||
1660 | here->e_value_size = cpu_to_le32(i->value_len); | |
1661 | if (i->value == EXT4_ZERO_XATTR_VALUE) { | |
1662 | memset(val, 0, new_size); | |
1663 | } else { | |
1664 | memcpy(val, i->value, i->value_len); | |
1665 | /* Clear padding bytes. */ | |
1666 | memset(val + i->value_len, 0, new_size - i->value_len); | |
1667 | } | |
32aaf194 | 1668 | goto update_hash; |
dec214d0 | 1669 | } |
e50e5129 | 1670 | |
ac27a0ec DK |
1671 | /* Compute min_offs and last. */ |
1672 | last = s->first; | |
5369a762 TT |
1673 | for (; !IS_LAST_ENTRY(last); last = next) { |
1674 | next = EXT4_XATTR_NEXT(last); | |
1675 | if ((void *)next >= s->end) { | |
1676 | EXT4_ERROR_INODE(inode, "corrupted xattr entries"); | |
1677 | ret = -EFSCORRUPTED; | |
1678 | goto out; | |
1679 | } | |
e50e5129 | 1680 | if (!last->e_value_inum && last->e_value_size) { |
ac27a0ec DK |
1681 | size_t offs = le16_to_cpu(last->e_value_offs); |
1682 | if (offs < min_offs) | |
1683 | min_offs = offs; | |
1684 | } | |
1685 | } | |
dec214d0 TE |
1686 | |
1687 | /* Check whether we have enough space. */ | |
ac27a0ec | 1688 | if (i->value) { |
dec214d0 | 1689 | size_t free; |
e50e5129 | 1690 | |
dec214d0 TE |
1691 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); |
1692 | if (!s->not_found) | |
1693 | free += EXT4_XATTR_LEN(name_len) + old_size; | |
e50e5129 | 1694 | |
dec214d0 TE |
1695 | if (free < EXT4_XATTR_LEN(name_len) + new_size) { |
1696 | ret = -ENOSPC; | |
1697 | goto out; | |
1698 | } | |
9c6e7853 TE |
1699 | |
1700 | /* | |
1701 | * If storing the value in an external inode is an option, | |
1702 | * reserve space for xattr entries/names in the external | |
1703 | * attribute block so that a long value does not occupy the | |
3088e5a5 | 1704 | * whole space and prevent further entries being added. |
9c6e7853 | 1705 | */ |
daf83281 TE |
1706 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
1707 | new_size && is_block && | |
9c6e7853 TE |
1708 | (min_offs + old_size - new_size) < |
1709 | EXT4_XATTR_BLOCK_RESERVE(inode)) { | |
1710 | ret = -ENOSPC; | |
1711 | goto out; | |
1712 | } | |
ac27a0ec DK |
1713 | } |
1714 | ||
dec214d0 TE |
1715 | /* |
1716 | * Getting access to old and new ea inodes is subject to failures. | |
1717 | * Finish that work before doing any modifications to the xattr data. | |
1718 | */ | |
1719 | if (!s->not_found && here->e_value_inum) { | |
1720 | ret = ext4_xattr_inode_iget(inode, | |
1721 | le32_to_cpu(here->e_value_inum), | |
a6d05676 | 1722 | le32_to_cpu(here->e_hash), |
dec214d0 TE |
1723 | &old_ea_inode); |
1724 | if (ret) { | |
1725 | old_ea_inode = NULL; | |
1726 | goto out; | |
1727 | } | |
1728 | } | |
1729 | if (i->value && in_inode) { | |
1730 | WARN_ON_ONCE(!i->value_len); | |
ac27a0ec | 1731 | |
dec214d0 TE |
1732 | ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); |
1733 | if (ret) | |
1734 | goto out; | |
1735 | ||
1736 | ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, | |
1737 | i->value_len, | |
1738 | &new_ea_inode); | |
1739 | if (ret) { | |
1740 | new_ea_inode = NULL; | |
a6d05676 | 1741 | ext4_xattr_inode_free_quota(inode, NULL, i->value_len); |
dec214d0 | 1742 | goto out; |
ac27a0ec | 1743 | } |
dec214d0 TE |
1744 | } |
1745 | ||
1746 | if (old_ea_inode) { | |
1747 | /* We are ready to release ref count on the old_ea_inode. */ | |
1748 | ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); | |
1749 | if (ret) { | |
1750 | /* Release newly required ref count on new_ea_inode. */ | |
1751 | if (new_ea_inode) { | |
1752 | int err; | |
1753 | ||
1754 | err = ext4_xattr_inode_dec_ref(handle, | |
1755 | new_ea_inode); | |
1756 | if (err) | |
1757 | ext4_warning_inode(new_ea_inode, | |
1758 | "dec ref new_ea_inode err=%d", | |
1759 | err); | |
a6d05676 | 1760 | ext4_xattr_inode_free_quota(inode, new_ea_inode, |
dec214d0 TE |
1761 | i->value_len); |
1762 | } | |
1763 | goto out; | |
e50e5129 | 1764 | } |
dec214d0 | 1765 | |
a6d05676 | 1766 | ext4_xattr_inode_free_quota(inode, old_ea_inode, |
dec214d0 TE |
1767 | le32_to_cpu(here->e_value_size)); |
1768 | } | |
1769 | ||
1770 | /* No failures allowed past this point. */ | |
1771 | ||
e5d01196 | 1772 | if (!s->not_found && here->e_value_size && !here->e_value_inum) { |
dec214d0 TE |
1773 | /* Remove the old value. */ |
1774 | void *first_val = s->base + min_offs; | |
1775 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1776 | void *val = s->base + offs; | |
1777 | ||
1778 | memmove(first_val + old_size, first_val, val - first_val); | |
1779 | memset(first_val, 0, old_size); | |
1780 | min_offs += old_size; | |
1781 | ||
1782 | /* Adjust all value offsets. */ | |
1783 | last = s->first; | |
1784 | while (!IS_LAST_ENTRY(last)) { | |
1785 | size_t o = le16_to_cpu(last->e_value_offs); | |
1786 | ||
1787 | if (!last->e_value_inum && | |
1788 | last->e_value_size && o < offs) | |
1789 | last->e_value_offs = cpu_to_le16(o + old_size); | |
1790 | last = EXT4_XATTR_NEXT(last); | |
ac27a0ec DK |
1791 | } |
1792 | } | |
1793 | ||
dec214d0 TE |
1794 | if (!i->value) { |
1795 | /* Remove old name. */ | |
1796 | size_t size = EXT4_XATTR_LEN(name_len); | |
1797 | ||
1798 | last = ENTRY((void *)last - size); | |
1799 | memmove(here, (void *)here + size, | |
1800 | (void *)last - (void *)here + sizeof(__u32)); | |
1801 | memset(last, 0, size); | |
1802 | } else if (s->not_found) { | |
1803 | /* Insert new name. */ | |
1804 | size_t size = EXT4_XATTR_LEN(name_len); | |
1805 | size_t rest = (void *)last - (void *)here + sizeof(__u32); | |
1806 | ||
1807 | memmove((void *)here + size, here, rest); | |
1808 | memset(here, 0, size); | |
1809 | here->e_name_index = i->name_index; | |
1810 | here->e_name_len = name_len; | |
1811 | memcpy(here->e_name, i->name, name_len); | |
1812 | } else { | |
1813 | /* This is an update, reset value info. */ | |
1814 | here->e_value_inum = 0; | |
1815 | here->e_value_offs = 0; | |
1816 | here->e_value_size = 0; | |
1817 | } | |
1818 | ||
ac27a0ec | 1819 | if (i->value) { |
dec214d0 | 1820 | /* Insert new value. */ |
e50e5129 | 1821 | if (in_inode) { |
dec214d0 | 1822 | here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); |
e50e5129 | 1823 | } else if (i->value_len) { |
dec214d0 TE |
1824 | void *val = s->base + min_offs - new_size; |
1825 | ||
1826 | here->e_value_offs = cpu_to_le16(min_offs - new_size); | |
bd9926e8 | 1827 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
dec214d0 | 1828 | memset(val, 0, new_size); |
bd9926e8 | 1829 | } else { |
bd9926e8 | 1830 | memcpy(val, i->value, i->value_len); |
dec214d0 TE |
1831 | /* Clear padding bytes. */ |
1832 | memset(val + i->value_len, 0, | |
1833 | new_size - i->value_len); | |
bd9926e8 | 1834 | } |
ac27a0ec | 1835 | } |
dec214d0 | 1836 | here->e_value_size = cpu_to_le32(i->value_len); |
ac27a0ec | 1837 | } |
daf83281 | 1838 | |
32aaf194 | 1839 | update_hash: |
b9fc761e TE |
1840 | if (i->value) { |
1841 | __le32 hash = 0; | |
1842 | ||
1843 | /* Entry hash calculation. */ | |
1844 | if (in_inode) { | |
1845 | __le32 crc32c_hash; | |
1846 | ||
1847 | /* | |
1848 | * Feed crc32c hash instead of the raw value for entry | |
1849 | * hash calculation. This is to avoid walking | |
1850 | * potentially long value buffer again. | |
1851 | */ | |
1852 | crc32c_hash = cpu_to_le32( | |
1853 | ext4_xattr_inode_get_hash(new_ea_inode)); | |
1854 | hash = ext4_xattr_hash_entry(here->e_name, | |
1855 | here->e_name_len, | |
1856 | &crc32c_hash, 1); | |
1857 | } else if (is_block) { | |
32aaf194 TE |
1858 | __le32 *value = s->base + le16_to_cpu( |
1859 | here->e_value_offs); | |
b9fc761e TE |
1860 | |
1861 | hash = ext4_xattr_hash_entry(here->e_name, | |
1862 | here->e_name_len, value, | |
1863 | new_size >> 2); | |
1864 | } | |
1865 | here->e_hash = hash; | |
daf83281 TE |
1866 | } |
1867 | ||
b9fc761e TE |
1868 | if (is_block) |
1869 | ext4_xattr_rehash((struct ext4_xattr_header *)s->base); | |
1870 | ||
dec214d0 | 1871 | ret = 0; |
e50e5129 | 1872 | out: |
dec214d0 TE |
1873 | iput(old_ea_inode); |
1874 | iput(new_ea_inode); | |
1875 | return ret; | |
ac27a0ec DK |
1876 | } |
1877 | ||
617ba13b MC |
1878 | struct ext4_xattr_block_find { |
1879 | struct ext4_xattr_search s; | |
ac27a0ec DK |
1880 | struct buffer_head *bh; |
1881 | }; | |
1882 | ||
1883 | static int | |
617ba13b MC |
1884 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
1885 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1886 | { |
1887 | struct super_block *sb = inode->i_sb; | |
1888 | int error; | |
1889 | ||
1890 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
1891 | i->name_index, i->name, i->value, (long)i->value_len); | |
1892 | ||
617ba13b | 1893 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 1894 | /* The inode already has an extended attribute block. */ |
fb265c9c | 1895 | bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
8418897f JX |
1896 | if (IS_ERR(bs->bh)) { |
1897 | error = PTR_ERR(bs->bh); | |
1898 | bs->bh = NULL; | |
1899 | return error; | |
1900 | } | |
ac27a0ec DK |
1901 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", |
1902 | atomic_read(&(bs->bh->b_count)), | |
1903 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
de05ca85 TT |
1904 | error = ext4_xattr_check_block(inode, bs->bh); |
1905 | if (error) | |
fb265c9c | 1906 | return error; |
ac27a0ec DK |
1907 | /* Find the named attribute. */ |
1908 | bs->s.base = BHDR(bs->bh); | |
1909 | bs->s.first = BFIRST(bs->bh); | |
1910 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
1911 | bs->s.here = bs->s.first; | |
9496005d TT |
1912 | error = xattr_find_entry(inode, &bs->s.here, bs->s.end, |
1913 | i->name_index, i->name, 1); | |
ac27a0ec | 1914 | if (error && error != -ENODATA) |
fb265c9c | 1915 | return error; |
ac27a0ec DK |
1916 | bs->s.not_found = error; |
1917 | } | |
fb265c9c | 1918 | return 0; |
ac27a0ec DK |
1919 | } |
1920 | ||
1921 | static int | |
617ba13b MC |
1922 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
1923 | struct ext4_xattr_info *i, | |
1924 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1925 | { |
1926 | struct super_block *sb = inode->i_sb; | |
1927 | struct buffer_head *new_bh = NULL; | |
b347e2bc TE |
1928 | struct ext4_xattr_search s_copy = bs->s; |
1929 | struct ext4_xattr_search *s = &s_copy; | |
7a2508e1 | 1930 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 1931 | int error = 0; |
47387409 | 1932 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
a6d05676 TE |
1933 | struct inode *ea_inode = NULL, *tmp_inode; |
1934 | size_t old_ea_inode_quota = 0; | |
1935 | unsigned int ea_ino; | |
1936 | ||
ac27a0ec | 1937 | |
617ba13b | 1938 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec | 1939 | |
ac27a0ec | 1940 | if (s->base) { |
fd48e9ac JK |
1941 | int offset = (char *)s->here - bs->bh->b_data; |
1942 | ||
5d601255 | 1943 | BUFFER_TRACE(bs->bh, "get_write_access"); |
188c299e JK |
1944 | error = ext4_journal_get_write_access(handle, sb, bs->bh, |
1945 | EXT4_JTR_NONE); | |
8a2bfdcb MC |
1946 | if (error) |
1947 | goto cleanup; | |
1948 | lock_buffer(bs->bh); | |
1949 | ||
ac27a0ec | 1950 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
1951 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
1952 | ||
1953 | /* | |
1954 | * This must happen under buffer lock for | |
1955 | * ext4_xattr_block_set() to reliably detect modified | |
1956 | * block | |
1957 | */ | |
65f8b800 JK |
1958 | if (ea_block_cache) { |
1959 | struct mb_cache_entry *oe; | |
1960 | ||
1961 | oe = mb_cache_entry_delete_or_get(ea_block_cache, | |
1962 | hash, bs->bh->b_blocknr); | |
1963 | if (oe) { | |
1964 | /* | |
1965 | * Xattr block is getting reused. Leave | |
1966 | * it alone. | |
1967 | */ | |
1968 | mb_cache_entry_put(ea_block_cache, oe); | |
1969 | goto clone_block; | |
1970 | } | |
1971 | } | |
ac27a0ec | 1972 | ea_bdebug(bs->bh, "modifying in-place"); |
daf83281 TE |
1973 | error = ext4_xattr_set_entry(i, s, handle, inode, |
1974 | true /* is_block */); | |
dac7a4b4 | 1975 | ext4_xattr_block_csum_set(inode, bs->bh); |
ac27a0ec | 1976 | unlock_buffer(bs->bh); |
6a797d27 | 1977 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1978 | goto bad_block; |
1979 | if (!error) | |
dac7a4b4 TT |
1980 | error = ext4_handle_dirty_metadata(handle, |
1981 | inode, | |
1982 | bs->bh); | |
ac27a0ec DK |
1983 | if (error) |
1984 | goto cleanup; | |
1985 | goto inserted; | |
fd48e9ac | 1986 | } |
65f8b800 | 1987 | clone_block: |
fd48e9ac JK |
1988 | unlock_buffer(bs->bh); |
1989 | ea_bdebug(bs->bh, "cloning"); | |
1990 | s->base = kmemdup(BHDR(bs->bh), bs->bh->b_size, GFP_NOFS); | |
1991 | error = -ENOMEM; | |
1992 | if (s->base == NULL) | |
1993 | goto cleanup; | |
1994 | s->first = ENTRY(header(s->base)+1); | |
1995 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1996 | s->here = ENTRY(s->base + offset); | |
1997 | s->end = s->base + bs->bh->b_size; | |
ac27a0ec | 1998 | |
fd48e9ac JK |
1999 | /* |
2000 | * If existing entry points to an xattr inode, we need | |
2001 | * to prevent ext4_xattr_set_entry() from decrementing | |
2002 | * ref count on it because the reference belongs to the | |
2003 | * original block. In this case, make the entry look | |
2004 | * like it has an empty value. | |
2005 | */ | |
2006 | if (!s->not_found && s->here->e_value_inum) { | |
2007 | ea_ino = le32_to_cpu(s->here->e_value_inum); | |
2008 | error = ext4_xattr_inode_iget(inode, ea_ino, | |
2009 | le32_to_cpu(s->here->e_hash), | |
2010 | &tmp_inode); | |
2011 | if (error) | |
ac27a0ec | 2012 | goto cleanup; |
dec214d0 | 2013 | |
fd48e9ac JK |
2014 | if (!ext4_test_inode_state(tmp_inode, |
2015 | EXT4_STATE_LUSTRE_EA_INODE)) { | |
2016 | /* | |
2017 | * Defer quota free call for previous | |
2018 | * inode until success is guaranteed. | |
2019 | */ | |
2020 | old_ea_inode_quota = le32_to_cpu( | |
2021 | s->here->e_value_size); | |
dec214d0 | 2022 | } |
fd48e9ac JK |
2023 | iput(tmp_inode); |
2024 | ||
2025 | s->here->e_value_inum = 0; | |
2026 | s->here->e_value_size = 0; | |
ac27a0ec DK |
2027 | } |
2028 | } else { | |
2029 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 2030 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
2031 | error = -ENOMEM; |
2032 | if (s->base == NULL) | |
2033 | goto cleanup; | |
617ba13b | 2034 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
2035 | header(s->base)->h_blocks = cpu_to_le32(1); |
2036 | header(s->base)->h_refcount = cpu_to_le32(1); | |
2037 | s->first = ENTRY(header(s->base)+1); | |
2038 | s->here = ENTRY(header(s->base)+1); | |
2039 | s->end = s->base + sb->s_blocksize; | |
2040 | } | |
2041 | ||
daf83281 | 2042 | error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); |
6a797d27 | 2043 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
2044 | goto bad_block; |
2045 | if (error) | |
2046 | goto cleanup; | |
dec214d0 TE |
2047 | |
2048 | if (i->value && s->here->e_value_inum) { | |
dec214d0 TE |
2049 | /* |
2050 | * A ref count on ea_inode has been taken as part of the call to | |
2051 | * ext4_xattr_set_entry() above. We would like to drop this | |
2052 | * extra ref but we have to wait until the xattr block is | |
2053 | * initialized and has its own ref count on the ea_inode. | |
2054 | */ | |
2055 | ea_ino = le32_to_cpu(s->here->e_value_inum); | |
a6d05676 TE |
2056 | error = ext4_xattr_inode_iget(inode, ea_ino, |
2057 | le32_to_cpu(s->here->e_hash), | |
2058 | &ea_inode); | |
dec214d0 TE |
2059 | if (error) { |
2060 | ea_inode = NULL; | |
2061 | goto cleanup; | |
2062 | } | |
2063 | } | |
2064 | ||
ac27a0ec DK |
2065 | inserted: |
2066 | if (!IS_LAST_ENTRY(s->first)) { | |
47387409 TE |
2067 | new_bh = ext4_xattr_block_cache_find(inode, header(s->base), |
2068 | &ce); | |
ac27a0ec DK |
2069 | if (new_bh) { |
2070 | /* We found an identical block in the cache. */ | |
2071 | if (new_bh == bs->bh) | |
2072 | ea_bdebug(new_bh, "keeping"); | |
2073 | else { | |
6048c64b AG |
2074 | u32 ref; |
2075 | ||
b8cb5a54 TE |
2076 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
2077 | ||
ac27a0ec DK |
2078 | /* The old block is released after updating |
2079 | the inode. */ | |
1231b3a1 LC |
2080 | error = dquot_alloc_block(inode, |
2081 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 2082 | if (error) |
ac27a0ec | 2083 | goto cleanup; |
5d601255 | 2084 | BUFFER_TRACE(new_bh, "get_write_access"); |
188c299e JK |
2085 | error = ext4_journal_get_write_access( |
2086 | handle, sb, new_bh, | |
2087 | EXT4_JTR_NONE); | |
ac27a0ec DK |
2088 | if (error) |
2089 | goto cleanup_dquot; | |
2090 | lock_buffer(new_bh); | |
82939d79 JK |
2091 | /* |
2092 | * We have to be careful about races with | |
65f8b800 JK |
2093 | * adding references to xattr block. Once we |
2094 | * hold buffer lock xattr block's state is | |
2095 | * stable so we can check the additional | |
2096 | * reference fits. | |
82939d79 | 2097 | */ |
65f8b800 JK |
2098 | ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
2099 | if (ref > EXT4_XATTR_REFCOUNT_MAX) { | |
82939d79 JK |
2100 | /* |
2101 | * Undo everything and check mbcache | |
2102 | * again. | |
2103 | */ | |
2104 | unlock_buffer(new_bh); | |
2105 | dquot_free_block(inode, | |
2106 | EXT4_C2B(EXT4_SB(sb), | |
2107 | 1)); | |
2108 | brelse(new_bh); | |
47387409 | 2109 | mb_cache_entry_put(ea_block_cache, ce); |
82939d79 JK |
2110 | ce = NULL; |
2111 | new_bh = NULL; | |
2112 | goto inserted; | |
2113 | } | |
6048c64b | 2114 | BHDR(new_bh)->h_refcount = cpu_to_le32(ref); |
65f8b800 | 2115 | if (ref == EXT4_XATTR_REFCOUNT_MAX) |
a44e84a9 | 2116 | clear_bit(MBE_REUSABLE_B, &ce->e_flags); |
ac27a0ec | 2117 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
6048c64b | 2118 | ref); |
dac7a4b4 | 2119 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec | 2120 | unlock_buffer(new_bh); |
dac7a4b4 TT |
2121 | error = ext4_handle_dirty_metadata(handle, |
2122 | inode, | |
2123 | new_bh); | |
ac27a0ec DK |
2124 | if (error) |
2125 | goto cleanup_dquot; | |
2126 | } | |
47387409 TE |
2127 | mb_cache_entry_touch(ea_block_cache, ce); |
2128 | mb_cache_entry_put(ea_block_cache, ce); | |
ac27a0ec DK |
2129 | ce = NULL; |
2130 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
2131 | /* We were modifying this block in-place. */ | |
2132 | ea_bdebug(bs->bh, "keeping this block"); | |
ec000220 | 2133 | ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); |
ac27a0ec DK |
2134 | new_bh = bs->bh; |
2135 | get_bh(new_bh); | |
2136 | } else { | |
2137 | /* We need to allocate a new block */ | |
fb0a387d ES |
2138 | ext4_fsblk_t goal, block; |
2139 | ||
b8cb5a54 TE |
2140 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
2141 | ||
fb0a387d | 2142 | goal = ext4_group_first_block_no(sb, |
d00a6d7b | 2143 | EXT4_I(inode)->i_block_group); |
55f020db AH |
2144 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
2145 | NULL, &error); | |
ac27a0ec DK |
2146 | if (error) |
2147 | goto cleanup; | |
fb0a387d | 2148 | |
ace36ad4 JP |
2149 | ea_idebug(inode, "creating block %llu", |
2150 | (unsigned long long)block); | |
ac27a0ec DK |
2151 | |
2152 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 2153 | if (unlikely(!new_bh)) { |
860d21e2 | 2154 | error = -ENOMEM; |
ac27a0ec | 2155 | getblk_failed: |
7dc57615 | 2156 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 2157 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
2158 | goto cleanup; |
2159 | } | |
dec214d0 TE |
2160 | error = ext4_xattr_inode_inc_ref_all(handle, inode, |
2161 | ENTRY(header(s->base)+1)); | |
2162 | if (error) | |
2163 | goto getblk_failed; | |
2164 | if (ea_inode) { | |
2165 | /* Drop the extra ref on ea_inode. */ | |
2166 | error = ext4_xattr_inode_dec_ref(handle, | |
2167 | ea_inode); | |
2168 | if (error) | |
2169 | ext4_warning_inode(ea_inode, | |
2170 | "dec ref error=%d", | |
2171 | error); | |
2172 | iput(ea_inode); | |
2173 | ea_inode = NULL; | |
2174 | } | |
2175 | ||
ac27a0ec | 2176 | lock_buffer(new_bh); |
188c299e JK |
2177 | error = ext4_journal_get_create_access(handle, sb, |
2178 | new_bh, EXT4_JTR_NONE); | |
ac27a0ec DK |
2179 | if (error) { |
2180 | unlock_buffer(new_bh); | |
860d21e2 | 2181 | error = -EIO; |
ac27a0ec DK |
2182 | goto getblk_failed; |
2183 | } | |
2184 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
dac7a4b4 | 2185 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec DK |
2186 | set_buffer_uptodate(new_bh); |
2187 | unlock_buffer(new_bh); | |
47387409 | 2188 | ext4_xattr_block_cache_insert(ea_block_cache, new_bh); |
dac7a4b4 TT |
2189 | error = ext4_handle_dirty_metadata(handle, inode, |
2190 | new_bh); | |
ac27a0ec DK |
2191 | if (error) |
2192 | goto cleanup; | |
2193 | } | |
2194 | } | |
2195 | ||
a6d05676 TE |
2196 | if (old_ea_inode_quota) |
2197 | ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); | |
dec214d0 | 2198 | |
ac27a0ec | 2199 | /* Update the inode. */ |
617ba13b | 2200 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
2201 | |
2202 | /* Drop the previous xattr block. */ | |
dec214d0 TE |
2203 | if (bs->bh && bs->bh != new_bh) { |
2204 | struct ext4_xattr_inode_array *ea_inode_array = NULL; | |
2205 | ||
2206 | ext4_xattr_release_block(handle, inode, bs->bh, | |
2207 | &ea_inode_array, | |
2208 | 0 /* extra_credits */); | |
2209 | ext4_xattr_inode_array_free(ea_inode_array); | |
2210 | } | |
ac27a0ec DK |
2211 | error = 0; |
2212 | ||
2213 | cleanup: | |
dec214d0 TE |
2214 | if (ea_inode) { |
2215 | int error2; | |
2216 | ||
2217 | error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
2218 | if (error2) | |
2219 | ext4_warning_inode(ea_inode, "dec ref error=%d", | |
2220 | error2); | |
2221 | ||
2222 | /* If there was an error, revert the quota charge. */ | |
2223 | if (error) | |
a6d05676 | 2224 | ext4_xattr_inode_free_quota(inode, ea_inode, |
dec214d0 TE |
2225 | i_size_read(ea_inode)); |
2226 | iput(ea_inode); | |
2227 | } | |
ac27a0ec | 2228 | if (ce) |
47387409 | 2229 | mb_cache_entry_put(ea_block_cache, ce); |
ac27a0ec DK |
2230 | brelse(new_bh); |
2231 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
2232 | kfree(s->base); | |
2233 | ||
2234 | return error; | |
2235 | ||
2236 | cleanup_dquot: | |
1231b3a1 | 2237 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
2238 | goto cleanup; |
2239 | ||
2240 | bad_block: | |
24676da4 TT |
2241 | EXT4_ERROR_INODE(inode, "bad block %llu", |
2242 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
2243 | goto cleanup; |
2244 | ||
2245 | #undef header | |
2246 | } | |
2247 | ||
879b3825 TM |
2248 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
2249 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2250 | { |
617ba13b MC |
2251 | struct ext4_xattr_ibody_header *header; |
2252 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
2253 | int error; |
2254 | ||
67d7d8ad | 2255 | if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) |
ac27a0ec | 2256 | return 0; |
67d7d8ad | 2257 | |
617ba13b | 2258 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
2259 | header = IHDR(inode, raw_inode); |
2260 | is->s.base = is->s.first = IFIRST(header); | |
2261 | is->s.here = is->s.first; | |
617ba13b | 2262 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 2263 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
9e92f48c | 2264 | error = xattr_check_inode(inode, header, is->s.end); |
ac27a0ec DK |
2265 | if (error) |
2266 | return error; | |
2267 | /* Find the named attribute. */ | |
9496005d TT |
2268 | error = xattr_find_entry(inode, &is->s.here, is->s.end, |
2269 | i->name_index, i->name, 0); | |
ac27a0ec DK |
2270 | if (error && error != -ENODATA) |
2271 | return error; | |
2272 | is->s.not_found = error; | |
2273 | } | |
2274 | return 0; | |
2275 | } | |
2276 | ||
310c097c | 2277 | int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, |
0d812f77 TM |
2278 | struct ext4_xattr_info *i, |
2279 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2280 | { |
617ba13b MC |
2281 | struct ext4_xattr_ibody_header *header; |
2282 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
2283 | int error; |
2284 | ||
67d7d8ad | 2285 | if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) |
ac27a0ec | 2286 | return -ENOSPC; |
67d7d8ad | 2287 | |
daf83281 | 2288 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
ac27a0ec DK |
2289 | if (error) |
2290 | return error; | |
617ba13b | 2291 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 2292 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 2293 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 2294 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2295 | } else { |
2296 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 2297 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2298 | } |
2299 | return 0; | |
2300 | } | |
2301 | ||
3fd16462 JK |
2302 | static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
2303 | struct ext4_xattr_info *i) | |
2304 | { | |
2305 | void *value; | |
2306 | ||
0bd454c0 TE |
2307 | /* When e_value_inum is set the value is stored externally. */ |
2308 | if (s->here->e_value_inum) | |
2309 | return 0; | |
3fd16462 JK |
2310 | if (le32_to_cpu(s->here->e_value_size) != i->value_len) |
2311 | return 0; | |
2312 | value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); | |
2313 | return !memcmp(value, i->value, i->value_len); | |
2314 | } | |
2315 | ||
dec214d0 TE |
2316 | static struct buffer_head *ext4_xattr_get_block(struct inode *inode) |
2317 | { | |
2318 | struct buffer_head *bh; | |
2319 | int error; | |
2320 | ||
2321 | if (!EXT4_I(inode)->i_file_acl) | |
2322 | return NULL; | |
fb265c9c TT |
2323 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2324 | if (IS_ERR(bh)) | |
2325 | return bh; | |
dec214d0 | 2326 | error = ext4_xattr_check_block(inode, bh); |
ecaaf408 VA |
2327 | if (error) { |
2328 | brelse(bh); | |
dec214d0 | 2329 | return ERR_PTR(error); |
ecaaf408 | 2330 | } |
dec214d0 TE |
2331 | return bh; |
2332 | } | |
2333 | ||
ac27a0ec | 2334 | /* |
617ba13b | 2335 | * ext4_xattr_set_handle() |
ac27a0ec | 2336 | * |
6e9510b0 | 2337 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
2338 | * is NULL to remove an existing extended attribute, and non-NULL to |
2339 | * either replace an existing extended attribute, or create a new extended | |
2340 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
2341 | * specify that an extended attribute must exist and must not exist | |
2342 | * previous to the call, respectively. | |
2343 | * | |
2344 | * Returns 0, or a negative error number on failure. | |
2345 | */ | |
2346 | int | |
617ba13b | 2347 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
2348 | const char *name, const void *value, size_t value_len, |
2349 | int flags) | |
2350 | { | |
617ba13b | 2351 | struct ext4_xattr_info i = { |
ac27a0ec DK |
2352 | .name_index = name_index, |
2353 | .name = name, | |
2354 | .value = value, | |
2355 | .value_len = value_len, | |
e50e5129 | 2356 | .in_inode = 0, |
ac27a0ec | 2357 | }; |
617ba13b | 2358 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
2359 | .s = { .not_found = -ENODATA, }, |
2360 | }; | |
617ba13b | 2361 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
2362 | .s = { .not_found = -ENODATA, }, |
2363 | }; | |
c755e251 | 2364 | int no_expand; |
ac27a0ec DK |
2365 | int error; |
2366 | ||
2367 | if (!name) | |
2368 | return -EINVAL; | |
2369 | if (strlen(name) > 255) | |
2370 | return -ERANGE; | |
b8cb5a54 | 2371 | |
c755e251 | 2372 | ext4_write_lock_xattr(inode, &no_expand); |
4d20c685 | 2373 | |
c1a5d5f6 TE |
2374 | /* Check journal credits under write lock. */ |
2375 | if (ext4_handle_valid(handle)) { | |
dec214d0 | 2376 | struct buffer_head *bh; |
c1a5d5f6 TE |
2377 | int credits; |
2378 | ||
dec214d0 TE |
2379 | bh = ext4_xattr_get_block(inode); |
2380 | if (IS_ERR(bh)) { | |
2381 | error = PTR_ERR(bh); | |
2382 | goto cleanup; | |
2383 | } | |
2384 | ||
af65207c TE |
2385 | credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2386 | value_len, | |
2387 | flags & XATTR_CREATE); | |
dec214d0 TE |
2388 | brelse(bh); |
2389 | ||
a9a8344e | 2390 | if (jbd2_handle_buffer_credits(handle) < credits) { |
c1a5d5f6 TE |
2391 | error = -ENOSPC; |
2392 | goto cleanup; | |
2393 | } | |
163f0ec1 | 2394 | WARN_ON_ONCE(!(current->flags & PF_MEMALLOC_NOFS)); |
c1a5d5f6 TE |
2395 | } |
2396 | ||
66543617 | 2397 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
2398 | if (error) |
2399 | goto cleanup; | |
2400 | ||
19f5fb7a | 2401 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
2402 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
2403 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 2404 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
2405 | } |
2406 | ||
617ba13b | 2407 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
2408 | if (error) |
2409 | goto cleanup; | |
2410 | if (is.s.not_found) | |
617ba13b | 2411 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
2412 | if (error) |
2413 | goto cleanup; | |
2414 | if (is.s.not_found && bs.s.not_found) { | |
2415 | error = -ENODATA; | |
2416 | if (flags & XATTR_REPLACE) | |
2417 | goto cleanup; | |
2418 | error = 0; | |
2419 | if (!value) | |
2420 | goto cleanup; | |
2421 | } else { | |
2422 | error = -EEXIST; | |
2423 | if (flags & XATTR_CREATE) | |
2424 | goto cleanup; | |
2425 | } | |
dec214d0 | 2426 | |
ac27a0ec DK |
2427 | if (!value) { |
2428 | if (!is.s.not_found) | |
e50e5129 | 2429 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 2430 | else if (!bs.s.not_found) |
617ba13b | 2431 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2432 | } else { |
3fd16462 JK |
2433 | error = 0; |
2434 | /* Xattr value did not change? Save us some work and bail out */ | |
2435 | if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) | |
2436 | goto cleanup; | |
2437 | if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) | |
2438 | goto cleanup; | |
2439 | ||
b347e2bc TE |
2440 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2441 | (EXT4_XATTR_SIZE(i.value_len) > | |
2442 | EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) | |
2443 | i.in_inode = 1; | |
2444 | retry_inode: | |
e50e5129 | 2445 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
2446 | if (!error && !bs.s.not_found) { |
2447 | i.value = NULL; | |
617ba13b | 2448 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2449 | } else if (error == -ENOSPC) { |
7e01c8e5 | 2450 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
45ae932d VA |
2451 | brelse(bs.bh); |
2452 | bs.bh = NULL; | |
7e01c8e5 TY |
2453 | error = ext4_xattr_block_find(inode, &i, &bs); |
2454 | if (error) | |
2455 | goto cleanup; | |
2456 | } | |
617ba13b | 2457 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
b347e2bc | 2458 | if (!error && !is.s.not_found) { |
ac27a0ec | 2459 | i.value = NULL; |
e50e5129 AD |
2460 | error = ext4_xattr_ibody_set(handle, inode, &i, |
2461 | &is); | |
b347e2bc TE |
2462 | } else if (error == -ENOSPC) { |
2463 | /* | |
2464 | * Xattr does not fit in the block, store at | |
2465 | * external inode if possible. | |
2466 | */ | |
2467 | if (ext4_has_feature_ea_inode(inode->i_sb) && | |
6b224899 | 2468 | i.value_len && !i.in_inode) { |
b347e2bc TE |
2469 | i.in_inode = 1; |
2470 | goto retry_inode; | |
2471 | } | |
ac27a0ec DK |
2472 | } |
2473 | } | |
2474 | } | |
2475 | if (!error) { | |
617ba13b | 2476 | ext4_xattr_update_super_block(handle, inode->i_sb); |
eeca7ea1 | 2477 | inode->i_ctime = current_time(inode); |
a642c2c0 | 2478 | inode_inc_iversion(inode); |
6dd4ee7c | 2479 | if (!value) |
c755e251 | 2480 | no_expand = 0; |
617ba13b | 2481 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 2482 | /* |
617ba13b | 2483 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
2484 | * error != 0. |
2485 | */ | |
2486 | is.iloc.bh = NULL; | |
2487 | if (IS_SYNC(inode)) | |
0390131b | 2488 | ext4_handle_sync(handle); |
ac27a0ec | 2489 | } |
e85c81ba | 2490 | ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); |
ac27a0ec DK |
2491 | |
2492 | cleanup: | |
2493 | brelse(is.iloc.bh); | |
2494 | brelse(bs.bh); | |
c755e251 | 2495 | ext4_write_unlock_xattr(inode, &no_expand); |
ac27a0ec DK |
2496 | return error; |
2497 | } | |
2498 | ||
af65207c TE |
2499 | int ext4_xattr_set_credits(struct inode *inode, size_t value_len, |
2500 | bool is_create, int *credits) | |
c1a5d5f6 | 2501 | { |
dec214d0 TE |
2502 | struct buffer_head *bh; |
2503 | int err; | |
c1a5d5f6 | 2504 | |
dec214d0 | 2505 | *credits = 0; |
c1a5d5f6 | 2506 | |
dec214d0 TE |
2507 | if (!EXT4_SB(inode->i_sb)->s_journal) |
2508 | return 0; | |
c1a5d5f6 | 2509 | |
dec214d0 | 2510 | down_read(&EXT4_I(inode)->xattr_sem); |
c1a5d5f6 | 2511 | |
dec214d0 TE |
2512 | bh = ext4_xattr_get_block(inode); |
2513 | if (IS_ERR(bh)) { | |
2514 | err = PTR_ERR(bh); | |
2515 | } else { | |
af65207c TE |
2516 | *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2517 | value_len, is_create); | |
dec214d0 TE |
2518 | brelse(bh); |
2519 | err = 0; | |
c1a5d5f6 | 2520 | } |
dec214d0 TE |
2521 | |
2522 | up_read(&EXT4_I(inode)->xattr_sem); | |
2523 | return err; | |
c1a5d5f6 TE |
2524 | } |
2525 | ||
ac27a0ec | 2526 | /* |
617ba13b | 2527 | * ext4_xattr_set() |
ac27a0ec | 2528 | * |
617ba13b | 2529 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
2530 | * attribute modification is a filesystem transaction by itself. |
2531 | * | |
2532 | * Returns 0, or a negative error number on failure. | |
2533 | */ | |
2534 | int | |
617ba13b | 2535 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
2536 | const void *value, size_t value_len, int flags) |
2537 | { | |
2538 | handle_t *handle; | |
e50e5129 | 2539 | struct super_block *sb = inode->i_sb; |
ac27a0ec | 2540 | int error, retries = 0; |
c1a5d5f6 | 2541 | int credits; |
ac27a0ec | 2542 | |
b8cb5a54 TE |
2543 | error = dquot_initialize(inode); |
2544 | if (error) | |
2545 | return error; | |
e50e5129 | 2546 | |
ac27a0ec | 2547 | retry: |
af65207c TE |
2548 | error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, |
2549 | &credits); | |
dec214d0 TE |
2550 | if (error) |
2551 | return error; | |
2552 | ||
9924a92a | 2553 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
2554 | if (IS_ERR(handle)) { |
2555 | error = PTR_ERR(handle); | |
2556 | } else { | |
2557 | int error2; | |
2558 | ||
617ba13b | 2559 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 2560 | value, value_len, flags); |
617ba13b | 2561 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 2562 | if (error == -ENOSPC && |
e50e5129 | 2563 | ext4_should_retry_alloc(sb, &retries)) |
ac27a0ec DK |
2564 | goto retry; |
2565 | if (error == 0) | |
2566 | error = error2; | |
2567 | } | |
e85c81ba | 2568 | ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, NULL); |
ac27a0ec DK |
2569 | |
2570 | return error; | |
2571 | } | |
2572 | ||
6dd4ee7c KS |
2573 | /* |
2574 | * Shift the EA entries in the inode to create space for the increased | |
2575 | * i_extra_isize. | |
2576 | */ | |
2577 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
2578 | int value_offs_shift, void *to, | |
94405713 | 2579 | void *from, size_t n) |
6dd4ee7c KS |
2580 | { |
2581 | struct ext4_xattr_entry *last = entry; | |
2582 | int new_offs; | |
2583 | ||
94405713 JK |
2584 | /* We always shift xattr headers further thus offsets get lower */ |
2585 | BUG_ON(value_offs_shift > 0); | |
2586 | ||
6dd4ee7c KS |
2587 | /* Adjust the value offsets of the entries */ |
2588 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 2589 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
2590 | new_offs = le16_to_cpu(last->e_value_offs) + |
2591 | value_offs_shift; | |
6dd4ee7c KS |
2592 | last->e_value_offs = cpu_to_le16(new_offs); |
2593 | } | |
2594 | } | |
2595 | /* Shift the entries by n bytes */ | |
2596 | memmove(to, from, n); | |
2597 | } | |
2598 | ||
3f2571c1 JK |
2599 | /* |
2600 | * Move xattr pointed to by 'entry' from inode into external xattr block | |
2601 | */ | |
2602 | static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, | |
2603 | struct ext4_inode *raw_inode, | |
2604 | struct ext4_xattr_entry *entry) | |
2605 | { | |
2606 | struct ext4_xattr_ibody_find *is = NULL; | |
2607 | struct ext4_xattr_block_find *bs = NULL; | |
2608 | char *buffer = NULL, *b_entry_name = NULL; | |
f6109100 | 2609 | size_t value_size = le32_to_cpu(entry->e_value_size); |
3f2571c1 JK |
2610 | struct ext4_xattr_info i = { |
2611 | .value = NULL, | |
2612 | .value_len = 0, | |
2613 | .name_index = entry->e_name_index, | |
f6109100 | 2614 | .in_inode = !!entry->e_value_inum, |
3f2571c1 JK |
2615 | }; |
2616 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2617 | int error; | |
2618 | ||
3f2571c1 JK |
2619 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); |
2620 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
3f2571c1 | 2621 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); |
1e9d62d2 | 2622 | if (!is || !bs || !b_entry_name) { |
3f2571c1 JK |
2623 | error = -ENOMEM; |
2624 | goto out; | |
2625 | } | |
2626 | ||
2627 | is->s.not_found = -ENODATA; | |
2628 | bs->s.not_found = -ENODATA; | |
2629 | is->iloc.bh = NULL; | |
2630 | bs->bh = NULL; | |
2631 | ||
2632 | /* Save the entry name and the entry value */ | |
f6109100 | 2633 | if (entry->e_value_inum) { |
1e9d62d2 JN |
2634 | buffer = kvmalloc(value_size, GFP_NOFS); |
2635 | if (!buffer) { | |
2636 | error = -ENOMEM; | |
2637 | goto out; | |
2638 | } | |
2639 | ||
b9fc761e | 2640 | error = ext4_xattr_inode_get(inode, entry, buffer, value_size); |
f6109100 TE |
2641 | if (error) |
2642 | goto out; | |
2643 | } else { | |
2644 | size_t value_offs = le16_to_cpu(entry->e_value_offs); | |
1e9d62d2 | 2645 | buffer = (void *)IFIRST(header) + value_offs; |
f6109100 TE |
2646 | } |
2647 | ||
3f2571c1 JK |
2648 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); |
2649 | b_entry_name[entry->e_name_len] = '\0'; | |
2650 | i.name = b_entry_name; | |
2651 | ||
2652 | error = ext4_get_inode_loc(inode, &is->iloc); | |
2653 | if (error) | |
2654 | goto out; | |
2655 | ||
2656 | error = ext4_xattr_ibody_find(inode, &i, is); | |
2657 | if (error) | |
2658 | goto out; | |
2659 | ||
3f2571c1 JK |
2660 | i.value = buffer; |
2661 | i.value_len = value_size; | |
2662 | error = ext4_xattr_block_find(inode, &i, bs); | |
2663 | if (error) | |
2664 | goto out; | |
2665 | ||
1e9d62d2 | 2666 | /* Move ea entry from the inode into the block */ |
3f2571c1 JK |
2667 | error = ext4_xattr_block_set(handle, inode, &i, bs); |
2668 | if (error) | |
2669 | goto out; | |
1e9d62d2 JN |
2670 | |
2671 | /* Remove the chosen entry from the inode */ | |
2672 | i.value = NULL; | |
2673 | i.value_len = 0; | |
2674 | error = ext4_xattr_ibody_set(handle, inode, &i, is); | |
2675 | ||
3f2571c1 JK |
2676 | out: |
2677 | kfree(b_entry_name); | |
1e9d62d2 JN |
2678 | if (entry->e_value_inum && buffer) |
2679 | kvfree(buffer); | |
3f2571c1 JK |
2680 | if (is) |
2681 | brelse(is->iloc.bh); | |
6bdc9977 VA |
2682 | if (bs) |
2683 | brelse(bs->bh); | |
3f2571c1 JK |
2684 | kfree(is); |
2685 | kfree(bs); | |
2686 | ||
2687 | return error; | |
2688 | } | |
2689 | ||
dfa2064b JK |
2690 | static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, |
2691 | struct ext4_inode *raw_inode, | |
2692 | int isize_diff, size_t ifree, | |
2693 | size_t bfree, int *total_ino) | |
2694 | { | |
2695 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2696 | struct ext4_xattr_entry *small_entry; | |
2697 | struct ext4_xattr_entry *entry; | |
2698 | struct ext4_xattr_entry *last; | |
2699 | unsigned int entry_size; /* EA entry size */ | |
2700 | unsigned int total_size; /* EA entry size + value size */ | |
2701 | unsigned int min_total_size; | |
2702 | int error; | |
2703 | ||
2704 | while (isize_diff > ifree) { | |
2705 | entry = NULL; | |
2706 | small_entry = NULL; | |
2707 | min_total_size = ~0U; | |
2708 | last = IFIRST(header); | |
2709 | /* Find the entry best suited to be pushed into EA block */ | |
2710 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
8cdb5240 TT |
2711 | /* never move system.data out of the inode */ |
2712 | if ((last->e_name_len == 4) && | |
2713 | (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) && | |
2714 | !memcmp(last->e_name, "data", 4)) | |
2715 | continue; | |
9bb21ced TE |
2716 | total_size = EXT4_XATTR_LEN(last->e_name_len); |
2717 | if (!last->e_value_inum) | |
2718 | total_size += EXT4_XATTR_SIZE( | |
2719 | le32_to_cpu(last->e_value_size)); | |
dfa2064b JK |
2720 | if (total_size <= bfree && |
2721 | total_size < min_total_size) { | |
2722 | if (total_size + ifree < isize_diff) { | |
2723 | small_entry = last; | |
2724 | } else { | |
2725 | entry = last; | |
2726 | min_total_size = total_size; | |
2727 | } | |
2728 | } | |
2729 | } | |
2730 | ||
2731 | if (entry == NULL) { | |
2732 | if (small_entry == NULL) | |
2733 | return -ENOSPC; | |
2734 | entry = small_entry; | |
2735 | } | |
2736 | ||
2737 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
9bb21ced TE |
2738 | total_size = entry_size; |
2739 | if (!entry->e_value_inum) | |
2740 | total_size += EXT4_XATTR_SIZE( | |
2741 | le32_to_cpu(entry->e_value_size)); | |
dfa2064b JK |
2742 | error = ext4_xattr_move_to_block(handle, inode, raw_inode, |
2743 | entry); | |
2744 | if (error) | |
2745 | return error; | |
2746 | ||
2747 | *total_ino -= entry_size; | |
2748 | ifree += total_size; | |
2749 | bfree -= total_size; | |
2750 | } | |
2751 | ||
2752 | return 0; | |
2753 | } | |
2754 | ||
6dd4ee7c KS |
2755 | /* |
2756 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
2757 | * Returns 0 on success or negative error number on failure. | |
2758 | */ | |
2759 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
2760 | struct ext4_inode *raw_inode, handle_t *handle) | |
2761 | { | |
2762 | struct ext4_xattr_ibody_header *header; | |
cf0a5e81 MX |
2763 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
2764 | static unsigned int mnt_count; | |
e3014d14 JK |
2765 | size_t min_offs; |
2766 | size_t ifree, bfree; | |
7b1b2c1b | 2767 | int total_ino; |
6e0cd088 | 2768 | void *base, *end; |
d0141191 | 2769 | int error = 0, tried_min_extra_isize = 0; |
cf0a5e81 | 2770 | int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); |
d0141191 | 2771 | int isize_diff; /* How much do we need to grow i_extra_isize */ |
6dd4ee7c | 2772 | |
6dd4ee7c | 2773 | retry: |
d0141191 | 2774 | isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; |
2e81a4ee | 2775 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) |
b640b2c5 | 2776 | return 0; |
6dd4ee7c KS |
2777 | |
2778 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
2779 | |
2780 | /* | |
2781 | * Check if enough free space is available in the inode to shift the | |
2782 | * entries ahead by new_extra_isize. | |
2783 | */ | |
2784 | ||
6e0cd088 | 2785 | base = IFIRST(header); |
6dd4ee7c KS |
2786 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
2787 | min_offs = end - base; | |
a805622a | 2788 | total_ino = sizeof(struct ext4_xattr_ibody_header) + sizeof(u32); |
6dd4ee7c | 2789 | |
9e92f48c TT |
2790 | error = xattr_check_inode(inode, header, end); |
2791 | if (error) | |
2792 | goto cleanup; | |
2793 | ||
6e0cd088 | 2794 | ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); |
e3014d14 JK |
2795 | if (ifree >= isize_diff) |
2796 | goto shift; | |
6dd4ee7c KS |
2797 | |
2798 | /* | |
2799 | * Enough free space isn't available in the inode, check if | |
2800 | * EA block can hold new_extra_isize bytes. | |
2801 | */ | |
2802 | if (EXT4_I(inode)->i_file_acl) { | |
53692ec0 VA |
2803 | struct buffer_head *bh; |
2804 | ||
fb265c9c TT |
2805 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2806 | if (IS_ERR(bh)) { | |
2807 | error = PTR_ERR(bh); | |
6dd4ee7c | 2808 | goto cleanup; |
fb265c9c | 2809 | } |
de05ca85 | 2810 | error = ext4_xattr_check_block(inode, bh); |
53692ec0 VA |
2811 | if (error) { |
2812 | brelse(bh); | |
6dd4ee7c | 2813 | goto cleanup; |
53692ec0 | 2814 | } |
6dd4ee7c | 2815 | base = BHDR(bh); |
6dd4ee7c KS |
2816 | end = bh->b_data + bh->b_size; |
2817 | min_offs = end - base; | |
6e0cd088 JK |
2818 | bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, |
2819 | NULL); | |
b640b2c5 | 2820 | brelse(bh); |
e3014d14 | 2821 | if (bfree + ifree < isize_diff) { |
6dd4ee7c KS |
2822 | if (!tried_min_extra_isize && s_min_extra_isize) { |
2823 | tried_min_extra_isize++; | |
2824 | new_extra_isize = s_min_extra_isize; | |
6dd4ee7c KS |
2825 | goto retry; |
2826 | } | |
dfa2064b | 2827 | error = -ENOSPC; |
6dd4ee7c KS |
2828 | goto cleanup; |
2829 | } | |
2830 | } else { | |
e3014d14 | 2831 | bfree = inode->i_sb->s_blocksize; |
6dd4ee7c KS |
2832 | } |
2833 | ||
dfa2064b JK |
2834 | error = ext4_xattr_make_inode_space(handle, inode, raw_inode, |
2835 | isize_diff, ifree, bfree, | |
2836 | &total_ino); | |
2837 | if (error) { | |
2838 | if (error == -ENOSPC && !tried_min_extra_isize && | |
2839 | s_min_extra_isize) { | |
2840 | tried_min_extra_isize++; | |
2841 | new_extra_isize = s_min_extra_isize; | |
dfa2064b | 2842 | goto retry; |
6dd4ee7c | 2843 | } |
dfa2064b | 2844 | goto cleanup; |
6dd4ee7c | 2845 | } |
e3014d14 JK |
2846 | shift: |
2847 | /* Adjust the offsets and shift the remaining entries ahead */ | |
6e0cd088 | 2848 | ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize |
e3014d14 JK |
2849 | - new_extra_isize, (void *)raw_inode + |
2850 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
94405713 | 2851 | (void *)header, total_ino); |
e3014d14 | 2852 | EXT4_I(inode)->i_extra_isize = new_extra_isize; |
6dd4ee7c | 2853 | |
2b96b4a5 YB |
2854 | if (ext4_has_inline_data(inode)) |
2855 | error = ext4_find_inline_data_nolock(inode); | |
2856 | ||
6dd4ee7c | 2857 | cleanup: |
b640b2c5 | 2858 | if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { |
cf0a5e81 MX |
2859 | ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", |
2860 | inode->i_ino); | |
2861 | mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); | |
2862 | } | |
6dd4ee7c KS |
2863 | return error; |
2864 | } | |
2865 | ||
e50e5129 AD |
2866 | #define EIA_INCR 16 /* must be 2^n */ |
2867 | #define EIA_MASK (EIA_INCR - 1) | |
dec214d0 TE |
2868 | |
2869 | /* Add the large xattr @inode into @ea_inode_array for deferred iput(). | |
0421a189 | 2870 | * If @ea_inode_array is new or full it will be grown and the old |
e50e5129 AD |
2871 | * contents copied over. |
2872 | */ | |
2873 | static int | |
0421a189 TE |
2874 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, |
2875 | struct inode *inode) | |
e50e5129 | 2876 | { |
0421a189 | 2877 | if (*ea_inode_array == NULL) { |
e50e5129 AD |
2878 | /* |
2879 | * Start with 15 inodes, so it fits into a power-of-two size. | |
0421a189 | 2880 | * If *ea_inode_array is NULL, this is essentially offsetof() |
e50e5129 | 2881 | */ |
0421a189 TE |
2882 | (*ea_inode_array) = |
2883 | kmalloc(offsetof(struct ext4_xattr_inode_array, | |
2884 | inodes[EIA_MASK]), | |
e50e5129 | 2885 | GFP_NOFS); |
0421a189 | 2886 | if (*ea_inode_array == NULL) |
e50e5129 | 2887 | return -ENOMEM; |
0421a189 TE |
2888 | (*ea_inode_array)->count = 0; |
2889 | } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { | |
e50e5129 | 2890 | /* expand the array once all 15 + n * 16 slots are full */ |
0421a189 TE |
2891 | struct ext4_xattr_inode_array *new_array = NULL; |
2892 | int count = (*ea_inode_array)->count; | |
e50e5129 AD |
2893 | |
2894 | /* if new_array is NULL, this is essentially offsetof() */ | |
2895 | new_array = kmalloc( | |
0421a189 TE |
2896 | offsetof(struct ext4_xattr_inode_array, |
2897 | inodes[count + EIA_INCR]), | |
e50e5129 AD |
2898 | GFP_NOFS); |
2899 | if (new_array == NULL) | |
2900 | return -ENOMEM; | |
0421a189 TE |
2901 | memcpy(new_array, *ea_inode_array, |
2902 | offsetof(struct ext4_xattr_inode_array, inodes[count])); | |
2903 | kfree(*ea_inode_array); | |
2904 | *ea_inode_array = new_array; | |
e50e5129 | 2905 | } |
0421a189 | 2906 | (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; |
e50e5129 AD |
2907 | return 0; |
2908 | } | |
2909 | ||
ac27a0ec | 2910 | /* |
617ba13b | 2911 | * ext4_xattr_delete_inode() |
ac27a0ec | 2912 | * |
e50e5129 | 2913 | * Free extended attribute resources associated with this inode. Traverse |
dec214d0 TE |
2914 | * all entries and decrement reference on any xattr inodes associated with this |
2915 | * inode. This is called immediately before an inode is freed. We have exclusive | |
2916 | * access to the inode. If an orphan inode is deleted it will also release its | |
2917 | * references on xattr block and xattr inodes. | |
ac27a0ec | 2918 | */ |
dec214d0 TE |
2919 | int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, |
2920 | struct ext4_xattr_inode_array **ea_inode_array, | |
2921 | int extra_credits) | |
ac27a0ec DK |
2922 | { |
2923 | struct buffer_head *bh = NULL; | |
e50e5129 | 2924 | struct ext4_xattr_ibody_header *header; |
30a7eb97 | 2925 | struct ext4_iloc iloc = { .bh = NULL }; |
dec214d0 | 2926 | struct ext4_xattr_entry *entry; |
a6d05676 | 2927 | struct inode *ea_inode; |
30a7eb97 TE |
2928 | int error; |
2929 | ||
83448bdf JK |
2930 | error = ext4_journal_ensure_credits(handle, extra_credits, |
2931 | ext4_free_metadata_revoke_credits(inode->i_sb, 1)); | |
a4130367 | 2932 | if (error < 0) { |
30a7eb97 TE |
2933 | EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); |
2934 | goto cleanup; | |
2935 | } | |
ac27a0ec | 2936 | |
dec214d0 TE |
2937 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2938 | ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
e50e5129 | 2939 | |
dec214d0 TE |
2940 | error = ext4_get_inode_loc(inode, &iloc); |
2941 | if (error) { | |
2942 | EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); | |
2943 | goto cleanup; | |
2944 | } | |
30a7eb97 | 2945 | |
188c299e JK |
2946 | error = ext4_journal_get_write_access(handle, inode->i_sb, |
2947 | iloc.bh, EXT4_JTR_NONE); | |
dec214d0 TE |
2948 | if (error) { |
2949 | EXT4_ERROR_INODE(inode, "write access (error %d)", | |
2950 | error); | |
2951 | goto cleanup; | |
2952 | } | |
e50e5129 | 2953 | |
dec214d0 TE |
2954 | header = IHDR(inode, ext4_raw_inode(&iloc)); |
2955 | if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) | |
2956 | ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, | |
2957 | IFIRST(header), | |
2958 | false /* block_csum */, | |
2959 | ea_inode_array, | |
2960 | extra_credits, | |
2961 | false /* skip_quota */); | |
ac27a0ec | 2962 | } |
e50e5129 | 2963 | |
dec214d0 | 2964 | if (EXT4_I(inode)->i_file_acl) { |
fb265c9c TT |
2965 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2966 | if (IS_ERR(bh)) { | |
2967 | error = PTR_ERR(bh); | |
878520ac | 2968 | if (error == -EIO) { |
54d3adbc TT |
2969 | EXT4_ERROR_INODE_ERR(inode, EIO, |
2970 | "block %llu read error", | |
2971 | EXT4_I(inode)->i_file_acl); | |
878520ac | 2972 | } |
7159a986 | 2973 | bh = NULL; |
dec214d0 TE |
2974 | goto cleanup; |
2975 | } | |
2976 | error = ext4_xattr_check_block(inode, bh); | |
de05ca85 | 2977 | if (error) |
e50e5129 | 2978 | goto cleanup; |
e50e5129 | 2979 | |
dec214d0 TE |
2980 | if (ext4_has_feature_ea_inode(inode->i_sb)) { |
2981 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
a6d05676 TE |
2982 | entry = EXT4_XATTR_NEXT(entry)) { |
2983 | if (!entry->e_value_inum) | |
2984 | continue; | |
2985 | error = ext4_xattr_inode_iget(inode, | |
2986 | le32_to_cpu(entry->e_value_inum), | |
2987 | le32_to_cpu(entry->e_hash), | |
2988 | &ea_inode); | |
2989 | if (error) | |
2990 | continue; | |
2991 | ext4_xattr_inode_free_quota(inode, ea_inode, | |
dec214d0 | 2992 | le32_to_cpu(entry->e_value_size)); |
a6d05676 TE |
2993 | iput(ea_inode); |
2994 | } | |
dec214d0 TE |
2995 | |
2996 | } | |
2997 | ||
2998 | ext4_xattr_release_block(handle, inode, bh, ea_inode_array, | |
2999 | extra_credits); | |
3000 | /* | |
3001 | * Update i_file_acl value in the same transaction that releases | |
3002 | * block. | |
3003 | */ | |
3004 | EXT4_I(inode)->i_file_acl = 0; | |
3005 | error = ext4_mark_inode_dirty(handle, inode); | |
3006 | if (error) { | |
3007 | EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", | |
3008 | error); | |
3009 | goto cleanup; | |
3010 | } | |
e85c81ba | 3011 | ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); |
30a7eb97 | 3012 | } |
dec214d0 | 3013 | error = 0; |
ac27a0ec | 3014 | cleanup: |
30a7eb97 | 3015 | brelse(iloc.bh); |
ac27a0ec | 3016 | brelse(bh); |
e50e5129 AD |
3017 | return error; |
3018 | } | |
3019 | ||
0421a189 | 3020 | void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) |
e50e5129 | 3021 | { |
dec214d0 | 3022 | int idx; |
e50e5129 | 3023 | |
0421a189 | 3024 | if (ea_inode_array == NULL) |
e50e5129 AD |
3025 | return; |
3026 | ||
dec214d0 TE |
3027 | for (idx = 0; idx < ea_inode_array->count; ++idx) |
3028 | iput(ea_inode_array->inodes[idx]); | |
0421a189 | 3029 | kfree(ea_inode_array); |
ac27a0ec DK |
3030 | } |
3031 | ||
ac27a0ec | 3032 | /* |
47387409 | 3033 | * ext4_xattr_block_cache_insert() |
ac27a0ec | 3034 | * |
47387409 | 3035 | * Create a new entry in the extended attribute block cache, and insert |
ac27a0ec DK |
3036 | * it unless such an entry is already in the cache. |
3037 | * | |
3038 | * Returns 0, or a negative error number on failure. | |
3039 | */ | |
3040 | static void | |
47387409 TE |
3041 | ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, |
3042 | struct buffer_head *bh) | |
ac27a0ec | 3043 | { |
6048c64b AG |
3044 | struct ext4_xattr_header *header = BHDR(bh); |
3045 | __u32 hash = le32_to_cpu(header->h_hash); | |
3046 | int reusable = le32_to_cpu(header->h_refcount) < | |
3047 | EXT4_XATTR_REFCOUNT_MAX; | |
ac27a0ec DK |
3048 | int error; |
3049 | ||
cdb7ee4c TE |
3050 | if (!ea_block_cache) |
3051 | return; | |
47387409 | 3052 | error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, |
6048c64b | 3053 | bh->b_blocknr, reusable); |
ac27a0ec | 3054 | if (error) { |
82939d79 | 3055 | if (error == -EBUSY) |
ac27a0ec | 3056 | ea_bdebug(bh, "already in cache"); |
82939d79 | 3057 | } else |
ac27a0ec | 3058 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
3059 | } |
3060 | ||
3061 | /* | |
617ba13b | 3062 | * ext4_xattr_cmp() |
ac27a0ec DK |
3063 | * |
3064 | * Compare two extended attribute blocks for equality. | |
3065 | * | |
3066 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
3067 | * a negative error number on errors. | |
3068 | */ | |
3069 | static int | |
617ba13b MC |
3070 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
3071 | struct ext4_xattr_header *header2) | |
ac27a0ec | 3072 | { |
617ba13b | 3073 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
3074 | |
3075 | entry1 = ENTRY(header1+1); | |
3076 | entry2 = ENTRY(header2+1); | |
3077 | while (!IS_LAST_ENTRY(entry1)) { | |
3078 | if (IS_LAST_ENTRY(entry2)) | |
3079 | return 1; | |
3080 | if (entry1->e_hash != entry2->e_hash || | |
3081 | entry1->e_name_index != entry2->e_name_index || | |
3082 | entry1->e_name_len != entry2->e_name_len || | |
3083 | entry1->e_value_size != entry2->e_value_size || | |
e50e5129 | 3084 | entry1->e_value_inum != entry2->e_value_inum || |
ac27a0ec DK |
3085 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) |
3086 | return 1; | |
7cec1918 TE |
3087 | if (!entry1->e_value_inum && |
3088 | memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), | |
ac27a0ec DK |
3089 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), |
3090 | le32_to_cpu(entry1->e_value_size))) | |
3091 | return 1; | |
3092 | ||
617ba13b MC |
3093 | entry1 = EXT4_XATTR_NEXT(entry1); |
3094 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
3095 | } |
3096 | if (!IS_LAST_ENTRY(entry2)) | |
3097 | return 1; | |
3098 | return 0; | |
3099 | } | |
3100 | ||
3101 | /* | |
47387409 | 3102 | * ext4_xattr_block_cache_find() |
ac27a0ec DK |
3103 | * |
3104 | * Find an identical extended attribute block. | |
3105 | * | |
3106 | * Returns a pointer to the block found, or NULL if such a block was | |
3107 | * not found or an error occurred. | |
3108 | */ | |
3109 | static struct buffer_head * | |
47387409 TE |
3110 | ext4_xattr_block_cache_find(struct inode *inode, |
3111 | struct ext4_xattr_header *header, | |
3112 | struct mb_cache_entry **pce) | |
ac27a0ec DK |
3113 | { |
3114 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 | 3115 | struct mb_cache_entry *ce; |
47387409 | 3116 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec | 3117 | |
cdb7ee4c TE |
3118 | if (!ea_block_cache) |
3119 | return NULL; | |
ac27a0ec DK |
3120 | if (!header->h_hash) |
3121 | return NULL; /* never share */ | |
3122 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
47387409 | 3123 | ce = mb_cache_entry_find_first(ea_block_cache, hash); |
ac27a0ec DK |
3124 | while (ce) { |
3125 | struct buffer_head *bh; | |
3126 | ||
fb265c9c TT |
3127 | bh = ext4_sb_bread(inode->i_sb, ce->e_value, REQ_PRIO); |
3128 | if (IS_ERR(bh)) { | |
3129 | if (PTR_ERR(bh) == -ENOMEM) | |
3130 | return NULL; | |
7159a986 | 3131 | bh = NULL; |
24676da4 | 3132 | EXT4_ERROR_INODE(inode, "block %lu read error", |
c07dfcb4 | 3133 | (unsigned long)ce->e_value); |
617ba13b | 3134 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
ac27a0ec DK |
3135 | *pce = ce; |
3136 | return bh; | |
3137 | } | |
3138 | brelse(bh); | |
47387409 | 3139 | ce = mb_cache_entry_find_next(ea_block_cache, ce); |
ac27a0ec DK |
3140 | } |
3141 | return NULL; | |
3142 | } | |
3143 | ||
3144 | #define NAME_HASH_SHIFT 5 | |
3145 | #define VALUE_HASH_SHIFT 16 | |
3146 | ||
3147 | /* | |
617ba13b | 3148 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
3149 | * |
3150 | * Compute the hash of an extended attribute. | |
3151 | */ | |
b9fc761e TE |
3152 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
3153 | size_t value_count) | |
ac27a0ec DK |
3154 | { |
3155 | __u32 hash = 0; | |
ac27a0ec | 3156 | |
b9fc761e | 3157 | while (name_len--) { |
ac27a0ec DK |
3158 | hash = (hash << NAME_HASH_SHIFT) ^ |
3159 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
3160 | *name++; | |
3161 | } | |
f3bbac32 LT |
3162 | while (value_count--) { |
3163 | hash = (hash << VALUE_HASH_SHIFT) ^ | |
3164 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
3165 | le32_to_cpu(*value++); | |
3166 | } | |
3167 | return cpu_to_le32(hash); | |
3168 | } | |
3169 | ||
3170 | /* | |
3171 | * ext4_xattr_hash_entry_signed() | |
3172 | * | |
3173 | * Compute the hash of an extended attribute incorrectly. | |
3174 | */ | |
3175 | static __le32 ext4_xattr_hash_entry_signed(char *name, size_t name_len, __le32 *value, size_t value_count) | |
3176 | { | |
3177 | __u32 hash = 0; | |
3178 | ||
3179 | while (name_len--) { | |
3180 | hash = (hash << NAME_HASH_SHIFT) ^ | |
3181 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
3182 | (signed char)*name++; | |
3183 | } | |
b9fc761e TE |
3184 | while (value_count--) { |
3185 | hash = (hash << VALUE_HASH_SHIFT) ^ | |
3186 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
3187 | le32_to_cpu(*value++); | |
ac27a0ec | 3188 | } |
b9fc761e | 3189 | return cpu_to_le32(hash); |
ac27a0ec DK |
3190 | } |
3191 | ||
3192 | #undef NAME_HASH_SHIFT | |
3193 | #undef VALUE_HASH_SHIFT | |
3194 | ||
3195 | #define BLOCK_HASH_SHIFT 16 | |
3196 | ||
3197 | /* | |
617ba13b | 3198 | * ext4_xattr_rehash() |
ac27a0ec DK |
3199 | * |
3200 | * Re-compute the extended attribute hash value after an entry has changed. | |
3201 | */ | |
daf83281 | 3202 | static void ext4_xattr_rehash(struct ext4_xattr_header *header) |
ac27a0ec | 3203 | { |
617ba13b | 3204 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
3205 | __u32 hash = 0; |
3206 | ||
ac27a0ec DK |
3207 | here = ENTRY(header+1); |
3208 | while (!IS_LAST_ENTRY(here)) { | |
3209 | if (!here->e_hash) { | |
3210 | /* Block is not shared if an entry's hash value == 0 */ | |
3211 | hash = 0; | |
3212 | break; | |
3213 | } | |
3214 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
3215 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
3216 | le32_to_cpu(here->e_hash); | |
617ba13b | 3217 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
3218 | } |
3219 | header->h_hash = cpu_to_le32(hash); | |
3220 | } | |
3221 | ||
3222 | #undef BLOCK_HASH_SHIFT | |
3223 | ||
9c191f70 M |
3224 | #define HASH_BUCKET_BITS 10 |
3225 | ||
7a2508e1 | 3226 | struct mb_cache * |
82939d79 | 3227 | ext4_xattr_create_cache(void) |
ac27a0ec | 3228 | { |
7a2508e1 | 3229 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
3230 | } |
3231 | ||
7a2508e1 | 3232 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 3233 | { |
9c191f70 | 3234 | if (cache) |
7a2508e1 | 3235 | mb_cache_destroy(cache); |
ac27a0ec | 3236 | } |
9c191f70 | 3237 |