Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ac27a0ec | 2 | /* |
617ba13b | 3 | * linux/fs/ext4/xattr.c |
ac27a0ec DK |
4 | * |
5 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> | |
6 | * | |
7 | * Fix by Harrison Xing <harrison@mountainviewdata.com>. | |
617ba13b | 8 | * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>. |
ac27a0ec DK |
9 | * Extended attributes for symlinks and special files added per |
10 | * suggestion of Luka Renko <luka.renko@hermes.si>. | |
11 | * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, | |
12 | * Red Hat Inc. | |
13 | * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz | |
14 | * and Andreas Gruenbacher <agruen@suse.de>. | |
15 | */ | |
16 | ||
17 | /* | |
18 | * Extended attributes are stored directly in inodes (on file systems with | |
19 | * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl | |
20 | * field contains the block number if an inode uses an additional block. All | |
21 | * attributes must fit in the inode and one additional block. Blocks that | |
22 | * contain the identical set of attributes may be shared among several inodes. | |
23 | * Identical blocks are detected by keeping a cache of blocks that have | |
24 | * recently been accessed. | |
25 | * | |
26 | * The attributes in inodes and on blocks have a different header; the entries | |
27 | * are stored in the same format: | |
28 | * | |
29 | * +------------------+ | |
30 | * | header | | |
31 | * | entry 1 | | | |
32 | * | entry 2 | | growing downwards | |
33 | * | entry 3 | v | |
34 | * | four null bytes | | |
35 | * | . . . | | |
36 | * | value 1 | ^ | |
37 | * | value 3 | | growing upwards | |
38 | * | value 2 | | | |
39 | * +------------------+ | |
40 | * | |
41 | * The header is followed by multiple entry descriptors. In disk blocks, the | |
42 | * entry descriptors are kept sorted. In inodes, they are unsorted. The | |
43 | * attribute values are aligned to the end of the block in no specific order. | |
44 | * | |
45 | * Locking strategy | |
46 | * ---------------- | |
617ba13b | 47 | * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem. |
ac27a0ec DK |
48 | * EA blocks are only changed if they are exclusive to an inode, so |
49 | * holding xattr_sem also means that nothing but the EA block's reference | |
50 | * count can change. Multiple writers to the same block are synchronized | |
51 | * by the buffer lock. | |
52 | */ | |
53 | ||
54 | #include <linux/init.h> | |
55 | #include <linux/fs.h> | |
56 | #include <linux/slab.h> | |
7a2508e1 | 57 | #include <linux/mbcache.h> |
ac27a0ec | 58 | #include <linux/quotaops.h> |
ee73f9a5 | 59 | #include <linux/iversion.h> |
3dcf5451 CH |
60 | #include "ext4_jbd2.h" |
61 | #include "ext4.h" | |
ac27a0ec DK |
62 | #include "xattr.h" |
63 | #include "acl.h" | |
64 | ||
617ba13b | 65 | #ifdef EXT4_XATTR_DEBUG |
d74f3d25 JP |
66 | # define ea_idebug(inode, fmt, ...) \ |
67 | printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \ | |
68 | inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__) | |
69 | # define ea_bdebug(bh, fmt, ...) \ | |
70 | printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \ | |
71 | bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__) | |
ac27a0ec | 72 | #else |
ace36ad4 JP |
73 | # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
74 | # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) | |
ac27a0ec DK |
75 | #endif |
76 | ||
47387409 TE |
77 | static void ext4_xattr_block_cache_insert(struct mb_cache *, |
78 | struct buffer_head *); | |
79 | static struct buffer_head * | |
80 | ext4_xattr_block_cache_find(struct inode *, struct ext4_xattr_header *, | |
81 | struct mb_cache_entry **); | |
b9fc761e TE |
82 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
83 | size_t value_count); | |
daf83281 | 84 | static void ext4_xattr_rehash(struct ext4_xattr_header *); |
ac27a0ec | 85 | |
d6006186 | 86 | static const struct xattr_handler * const ext4_xattr_handler_map[] = { |
617ba13b | 87 | [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, |
03010a33 | 88 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
89 | [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
90 | [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, | |
ac27a0ec | 91 | #endif |
617ba13b | 92 | [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, |
03010a33 | 93 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 94 | [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, |
ac27a0ec | 95 | #endif |
88ee9d57 | 96 | [EXT4_XATTR_INDEX_HURD] = &ext4_xattr_hurd_handler, |
ac27a0ec DK |
97 | }; |
98 | ||
11e27528 | 99 | const struct xattr_handler *ext4_xattr_handlers[] = { |
617ba13b MC |
100 | &ext4_xattr_user_handler, |
101 | &ext4_xattr_trusted_handler, | |
03010a33 | 102 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
64e178a7 CH |
103 | &posix_acl_access_xattr_handler, |
104 | &posix_acl_default_xattr_handler, | |
ac27a0ec | 105 | #endif |
03010a33 | 106 | #ifdef CONFIG_EXT4_FS_SECURITY |
617ba13b | 107 | &ext4_xattr_security_handler, |
ac27a0ec | 108 | #endif |
88ee9d57 | 109 | &ext4_xattr_hurd_handler, |
ac27a0ec DK |
110 | NULL |
111 | }; | |
112 | ||
47387409 TE |
113 | #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ |
114 | inode->i_sb->s_fs_info)->s_ea_block_cache) | |
9c191f70 | 115 | |
dec214d0 TE |
116 | #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ |
117 | inode->i_sb->s_fs_info)->s_ea_inode_cache) | |
118 | ||
30a7eb97 TE |
119 | static int |
120 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, | |
121 | struct inode *inode); | |
122 | ||
33d201e0 TE |
123 | #ifdef CONFIG_LOCKDEP |
124 | void ext4_xattr_inode_set_class(struct inode *ea_inode) | |
125 | { | |
126 | lockdep_set_subclass(&ea_inode->i_rwsem, 1); | |
127 | } | |
128 | #endif | |
129 | ||
cc8e94fd DW |
130 | static __le32 ext4_xattr_block_csum(struct inode *inode, |
131 | sector_t block_nr, | |
132 | struct ext4_xattr_header *hdr) | |
133 | { | |
134 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
d6a77105 | 135 | __u32 csum; |
d6a77105 | 136 | __le64 dsk_block_nr = cpu_to_le64(block_nr); |
b47820ed DJ |
137 | __u32 dummy_csum = 0; |
138 | int offset = offsetof(struct ext4_xattr_header, h_checksum); | |
cc8e94fd | 139 | |
d6a77105 TT |
140 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, |
141 | sizeof(dsk_block_nr)); | |
b47820ed DJ |
142 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); |
143 | csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); | |
144 | offset += sizeof(dummy_csum); | |
145 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, | |
146 | EXT4_BLOCK_SIZE(inode->i_sb) - offset); | |
41eb70dd | 147 | |
cc8e94fd DW |
148 | return cpu_to_le32(csum); |
149 | } | |
150 | ||
151 | static int ext4_xattr_block_csum_verify(struct inode *inode, | |
dac7a4b4 | 152 | struct buffer_head *bh) |
cc8e94fd | 153 | { |
dac7a4b4 TT |
154 | struct ext4_xattr_header *hdr = BHDR(bh); |
155 | int ret = 1; | |
cc8e94fd | 156 | |
dac7a4b4 TT |
157 | if (ext4_has_metadata_csum(inode->i_sb)) { |
158 | lock_buffer(bh); | |
159 | ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, | |
160 | bh->b_blocknr, hdr)); | |
161 | unlock_buffer(bh); | |
162 | } | |
163 | return ret; | |
cc8e94fd DW |
164 | } |
165 | ||
dac7a4b4 TT |
166 | static void ext4_xattr_block_csum_set(struct inode *inode, |
167 | struct buffer_head *bh) | |
cc8e94fd | 168 | { |
dac7a4b4 TT |
169 | if (ext4_has_metadata_csum(inode->i_sb)) |
170 | BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, | |
171 | bh->b_blocknr, BHDR(bh)); | |
cc8e94fd DW |
172 | } |
173 | ||
11e27528 | 174 | static inline const struct xattr_handler * |
617ba13b | 175 | ext4_xattr_handler(int name_index) |
ac27a0ec | 176 | { |
11e27528 | 177 | const struct xattr_handler *handler = NULL; |
ac27a0ec | 178 | |
617ba13b MC |
179 | if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
180 | handler = ext4_xattr_handler_map[name_index]; | |
ac27a0ec DK |
181 | return handler; |
182 | } | |
183 | ||
ac27a0ec | 184 | static int |
2c4f9923 EB |
185 | ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, |
186 | void *value_start) | |
ac27a0ec | 187 | { |
a0626e75 DW |
188 | struct ext4_xattr_entry *e = entry; |
189 | ||
d7614cc1 | 190 | /* Find the end of the names list */ |
a0626e75 DW |
191 | while (!IS_LAST_ENTRY(e)) { |
192 | struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); | |
ac27a0ec | 193 | if ((void *)next >= end) |
6a797d27 | 194 | return -EFSCORRUPTED; |
7d95178c TT |
195 | if (strnlen(e->e_name, e->e_name_len) != e->e_name_len) |
196 | return -EFSCORRUPTED; | |
a0626e75 | 197 | e = next; |
ac27a0ec | 198 | } |
a0626e75 | 199 | |
d7614cc1 | 200 | /* Check the values */ |
a0626e75 | 201 | while (!IS_LAST_ENTRY(entry)) { |
ce3fd194 EB |
202 | u32 size = le32_to_cpu(entry->e_value_size); |
203 | ||
54dd0e0a | 204 | if (size > EXT4_XATTR_SIZE_MAX) |
ce3fd194 EB |
205 | return -EFSCORRUPTED; |
206 | ||
207 | if (size != 0 && entry->e_value_inum == 0) { | |
d7614cc1 | 208 | u16 offs = le16_to_cpu(entry->e_value_offs); |
d7614cc1 EB |
209 | void *value; |
210 | ||
211 | /* | |
212 | * The value cannot overlap the names, and the value | |
213 | * with padding cannot extend beyond 'end'. Check both | |
214 | * the padded and unpadded sizes, since the size may | |
215 | * overflow to 0 when adding padding. | |
216 | */ | |
217 | if (offs > end - value_start) | |
218 | return -EFSCORRUPTED; | |
219 | value = value_start + offs; | |
220 | if (value < (void *)e + sizeof(u32) || | |
221 | size > end - value || | |
222 | EXT4_XATTR_SIZE(size) > end - value) | |
223 | return -EFSCORRUPTED; | |
224 | } | |
a0626e75 DW |
225 | entry = EXT4_XATTR_NEXT(entry); |
226 | } | |
227 | ||
ac27a0ec DK |
228 | return 0; |
229 | } | |
230 | ||
231 | static inline int | |
de05ca85 TT |
232 | __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh, |
233 | const char *function, unsigned int line) | |
ac27a0ec | 234 | { |
de05ca85 | 235 | int error = -EFSCORRUPTED; |
cc8e94fd | 236 | |
617ba13b | 237 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
ac27a0ec | 238 | BHDR(bh)->h_blocks != cpu_to_le32(1)) |
de05ca85 | 239 | goto errout; |
513f86d7 TT |
240 | if (buffer_verified(bh)) |
241 | return 0; | |
242 | ||
de05ca85 | 243 | error = -EFSBADCRC; |
dac7a4b4 | 244 | if (!ext4_xattr_block_csum_verify(inode, bh)) |
de05ca85 | 245 | goto errout; |
2c4f9923 EB |
246 | error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, |
247 | bh->b_data); | |
de05ca85 TT |
248 | errout: |
249 | if (error) | |
54d3adbc | 250 | __ext4_error_inode(inode, function, line, 0, -error, |
de05ca85 TT |
251 | "corrupted xattr block %llu", |
252 | (unsigned long long) bh->b_blocknr); | |
253 | else | |
cc8e94fd DW |
254 | set_buffer_verified(bh); |
255 | return error; | |
ac27a0ec DK |
256 | } |
257 | ||
de05ca85 TT |
258 | #define ext4_xattr_check_block(inode, bh) \ |
259 | __ext4_xattr_check_block((inode), (bh), __func__, __LINE__) | |
260 | ||
261 | ||
9e92f48c TT |
262 | static int |
263 | __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, | |
264 | void *end, const char *function, unsigned int line) | |
265 | { | |
9e92f48c TT |
266 | int error = -EFSCORRUPTED; |
267 | ||
290ab230 | 268 | if (end - (void *)header < sizeof(*header) + sizeof(u32) || |
19962509 | 269 | (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) |
9e92f48c | 270 | goto errout; |
2c4f9923 | 271 | error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); |
9e92f48c TT |
272 | errout: |
273 | if (error) | |
54d3adbc | 274 | __ext4_error_inode(inode, function, line, 0, -error, |
9e92f48c TT |
275 | "corrupted in-inode xattr"); |
276 | return error; | |
277 | } | |
278 | ||
279 | #define xattr_check_inode(inode, header, end) \ | |
280 | __xattr_check_inode((inode), (header), (end), __func__, __LINE__) | |
281 | ||
ac27a0ec | 282 | static int |
9496005d TT |
283 | xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry, |
284 | void *end, int name_index, const char *name, int sorted) | |
ac27a0ec | 285 | { |
9496005d | 286 | struct ext4_xattr_entry *entry, *next; |
ac27a0ec DK |
287 | size_t name_len; |
288 | int cmp = 1; | |
289 | ||
290 | if (name == NULL) | |
291 | return -EINVAL; | |
292 | name_len = strlen(name); | |
9496005d TT |
293 | for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) { |
294 | next = EXT4_XATTR_NEXT(entry); | |
295 | if ((void *) next >= end) { | |
296 | EXT4_ERROR_INODE(inode, "corrupted xattr entries"); | |
297 | return -EFSCORRUPTED; | |
298 | } | |
ac27a0ec DK |
299 | cmp = name_index - entry->e_name_index; |
300 | if (!cmp) | |
301 | cmp = name_len - entry->e_name_len; | |
302 | if (!cmp) | |
303 | cmp = memcmp(name, entry->e_name, name_len); | |
304 | if (cmp <= 0 && (sorted || cmp == 0)) | |
305 | break; | |
306 | } | |
307 | *pentry = entry; | |
ac27a0ec DK |
308 | return cmp ? -ENODATA : 0; |
309 | } | |
310 | ||
dec214d0 TE |
311 | static u32 |
312 | ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) | |
313 | { | |
314 | return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); | |
315 | } | |
316 | ||
317 | static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) | |
318 | { | |
319 | return ((u64)ea_inode->i_ctime.tv_sec << 32) | | |
ee73f9a5 | 320 | (u32) inode_peek_iversion_raw(ea_inode); |
dec214d0 TE |
321 | } |
322 | ||
323 | static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) | |
324 | { | |
325 | ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); | |
ee73f9a5 | 326 | inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); |
dec214d0 TE |
327 | } |
328 | ||
329 | static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) | |
330 | { | |
331 | return (u32)ea_inode->i_atime.tv_sec; | |
332 | } | |
333 | ||
334 | static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) | |
335 | { | |
336 | ea_inode->i_atime.tv_sec = hash; | |
337 | } | |
338 | ||
e50e5129 AD |
339 | /* |
340 | * Read the EA value from an inode. | |
341 | */ | |
90966693 | 342 | static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) |
e50e5129 | 343 | { |
9699d4f9 TE |
344 | int blocksize = 1 << ea_inode->i_blkbits; |
345 | int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; | |
346 | int tail_size = (size % blocksize) ?: blocksize; | |
347 | struct buffer_head *bhs_inline[8]; | |
348 | struct buffer_head **bhs = bhs_inline; | |
349 | int i, ret; | |
350 | ||
351 | if (bh_count > ARRAY_SIZE(bhs_inline)) { | |
352 | bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); | |
353 | if (!bhs) | |
354 | return -ENOMEM; | |
355 | } | |
90966693 | 356 | |
9699d4f9 TE |
357 | ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, |
358 | true /* wait */, bhs); | |
359 | if (ret) | |
360 | goto free_bhs; | |
e50e5129 | 361 | |
9699d4f9 TE |
362 | for (i = 0; i < bh_count; i++) { |
363 | /* There shouldn't be any holes in ea_inode. */ | |
364 | if (!bhs[i]) { | |
365 | ret = -EFSCORRUPTED; | |
366 | goto put_bhs; | |
367 | } | |
368 | memcpy((char *)buf + blocksize * i, bhs[i]->b_data, | |
369 | i < bh_count - 1 ? blocksize : tail_size); | |
e50e5129 | 370 | } |
9699d4f9 TE |
371 | ret = 0; |
372 | put_bhs: | |
373 | for (i = 0; i < bh_count; i++) | |
374 | brelse(bhs[i]); | |
375 | free_bhs: | |
376 | if (bhs != bhs_inline) | |
377 | kfree(bhs); | |
378 | return ret; | |
e50e5129 AD |
379 | } |
380 | ||
a6d05676 TE |
381 | #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) |
382 | ||
bab79b04 | 383 | static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, |
a6d05676 | 384 | u32 ea_inode_hash, struct inode **ea_inode) |
e50e5129 | 385 | { |
bab79b04 TE |
386 | struct inode *inode; |
387 | int err; | |
e50e5129 | 388 | |
8a363970 | 389 | inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_NORMAL); |
bab79b04 TE |
390 | if (IS_ERR(inode)) { |
391 | err = PTR_ERR(inode); | |
dec214d0 TE |
392 | ext4_error(parent->i_sb, |
393 | "error while reading EA inode %lu err=%d", ea_ino, | |
394 | err); | |
bab79b04 | 395 | return err; |
e50e5129 AD |
396 | } |
397 | ||
bab79b04 | 398 | if (is_bad_inode(inode)) { |
dec214d0 TE |
399 | ext4_error(parent->i_sb, |
400 | "error while reading EA inode %lu is_bad_inode", | |
401 | ea_ino); | |
bab79b04 TE |
402 | err = -EIO; |
403 | goto error; | |
404 | } | |
405 | ||
bab79b04 | 406 | if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { |
dec214d0 TE |
407 | ext4_error(parent->i_sb, |
408 | "EA inode %lu does not have EXT4_EA_INODE_FL flag", | |
409 | ea_ino); | |
bab79b04 | 410 | err = -EINVAL; |
e50e5129 AD |
411 | goto error; |
412 | } | |
413 | ||
a6d05676 TE |
414 | ext4_xattr_inode_set_class(inode); |
415 | ||
416 | /* | |
417 | * Check whether this is an old Lustre-style xattr inode. Lustre | |
418 | * implementation does not have hash validation, rather it has a | |
419 | * backpointer from ea_inode to the parent inode. | |
420 | */ | |
421 | if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && | |
422 | EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && | |
423 | inode->i_generation == parent->i_generation) { | |
424 | ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); | |
425 | ext4_xattr_inode_set_ref(inode, 1); | |
426 | } else { | |
427 | inode_lock(inode); | |
428 | inode->i_flags |= S_NOQUOTA; | |
429 | inode_unlock(inode); | |
430 | } | |
431 | ||
bab79b04 TE |
432 | *ea_inode = inode; |
433 | return 0; | |
e50e5129 | 434 | error: |
bab79b04 TE |
435 | iput(inode); |
436 | return err; | |
e50e5129 AD |
437 | } |
438 | ||
dec214d0 | 439 | static int |
b9fc761e TE |
440 | ext4_xattr_inode_verify_hashes(struct inode *ea_inode, |
441 | struct ext4_xattr_entry *entry, void *buffer, | |
442 | size_t size) | |
dec214d0 TE |
443 | { |
444 | u32 hash; | |
445 | ||
446 | /* Verify stored hash matches calculated hash. */ | |
447 | hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); | |
448 | if (hash != ext4_xattr_inode_get_hash(ea_inode)) | |
449 | return -EFSCORRUPTED; | |
b9fc761e TE |
450 | |
451 | if (entry) { | |
452 | __le32 e_hash, tmp_data; | |
453 | ||
454 | /* Verify entry hash. */ | |
455 | tmp_data = cpu_to_le32(hash); | |
456 | e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, | |
457 | &tmp_data, 1); | |
458 | if (e_hash != entry->e_hash) | |
459 | return -EFSCORRUPTED; | |
460 | } | |
dec214d0 TE |
461 | return 0; |
462 | } | |
463 | ||
e50e5129 | 464 | /* |
b9fc761e | 465 | * Read xattr value from the EA inode. |
e50e5129 AD |
466 | */ |
467 | static int | |
b9fc761e TE |
468 | ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, |
469 | void *buffer, size_t size) | |
e50e5129 | 470 | { |
dec214d0 | 471 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); |
bab79b04 | 472 | struct inode *ea_inode; |
dec214d0 | 473 | int err; |
e50e5129 | 474 | |
b9fc761e | 475 | err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), |
a6d05676 | 476 | le32_to_cpu(entry->e_hash), &ea_inode); |
dec214d0 TE |
477 | if (err) { |
478 | ea_inode = NULL; | |
479 | goto out; | |
480 | } | |
e50e5129 | 481 | |
dec214d0 TE |
482 | if (i_size_read(ea_inode) != size) { |
483 | ext4_warning_inode(ea_inode, | |
484 | "ea_inode file size=%llu entry size=%zu", | |
485 | i_size_read(ea_inode), size); | |
486 | err = -EFSCORRUPTED; | |
487 | goto out; | |
488 | } | |
e50e5129 | 489 | |
dec214d0 TE |
490 | err = ext4_xattr_inode_read(ea_inode, buffer, size); |
491 | if (err) | |
492 | goto out; | |
493 | ||
a6d05676 TE |
494 | if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { |
495 | err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, | |
496 | size); | |
497 | if (err) { | |
dec214d0 TE |
498 | ext4_warning_inode(ea_inode, |
499 | "EA inode hash validation failed"); | |
500 | goto out; | |
501 | } | |
dec214d0 | 502 | |
a6d05676 TE |
503 | if (ea_inode_cache) |
504 | mb_cache_entry_create(ea_inode_cache, GFP_NOFS, | |
505 | ext4_xattr_inode_get_hash(ea_inode), | |
506 | ea_inode->i_ino, true /* reusable */); | |
507 | } | |
dec214d0 TE |
508 | out: |
509 | iput(ea_inode); | |
510 | return err; | |
e50e5129 AD |
511 | } |
512 | ||
ac27a0ec | 513 | static int |
617ba13b | 514 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
515 | void *buffer, size_t buffer_size) |
516 | { | |
517 | struct buffer_head *bh = NULL; | |
617ba13b | 518 | struct ext4_xattr_entry *entry; |
ac27a0ec | 519 | size_t size; |
9496005d | 520 | void *end; |
ac27a0ec | 521 | int error; |
47387409 | 522 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec DK |
523 | |
524 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
525 | name_index, name, buffer, (long)buffer_size); | |
526 | ||
617ba13b | 527 | if (!EXT4_I(inode)->i_file_acl) |
fb265c9c | 528 | return -ENODATA; |
ace36ad4 JP |
529 | ea_idebug(inode, "reading block %llu", |
530 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
fb265c9c TT |
531 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
532 | if (IS_ERR(bh)) | |
533 | return PTR_ERR(bh); | |
ac27a0ec DK |
534 | ea_bdebug(bh, "b_count=%d, refcount=%d", |
535 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
de05ca85 TT |
536 | error = ext4_xattr_check_block(inode, bh); |
537 | if (error) | |
ac27a0ec | 538 | goto cleanup; |
47387409 | 539 | ext4_xattr_block_cache_insert(ea_block_cache, bh); |
ac27a0ec | 540 | entry = BFIRST(bh); |
9496005d TT |
541 | end = bh->b_data + bh->b_size; |
542 | error = xattr_find_entry(inode, &entry, end, name_index, name, 1); | |
ac27a0ec DK |
543 | if (error) |
544 | goto cleanup; | |
545 | size = le32_to_cpu(entry->e_value_size); | |
54dd0e0a TT |
546 | error = -ERANGE; |
547 | if (unlikely(size > EXT4_XATTR_SIZE_MAX)) | |
548 | goto cleanup; | |
ac27a0ec | 549 | if (buffer) { |
ac27a0ec DK |
550 | if (size > buffer_size) |
551 | goto cleanup; | |
e50e5129 | 552 | if (entry->e_value_inum) { |
b9fc761e TE |
553 | error = ext4_xattr_inode_get(inode, entry, buffer, |
554 | size); | |
e50e5129 AD |
555 | if (error) |
556 | goto cleanup; | |
557 | } else { | |
54dd0e0a TT |
558 | u16 offset = le16_to_cpu(entry->e_value_offs); |
559 | void *p = bh->b_data + offset; | |
560 | ||
561 | if (unlikely(p + size > end)) | |
562 | goto cleanup; | |
563 | memcpy(buffer, p, size); | |
e50e5129 | 564 | } |
ac27a0ec DK |
565 | } |
566 | error = size; | |
567 | ||
568 | cleanup: | |
569 | brelse(bh); | |
570 | return error; | |
571 | } | |
572 | ||
879b3825 | 573 | int |
617ba13b | 574 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
575 | void *buffer, size_t buffer_size) |
576 | { | |
617ba13b MC |
577 | struct ext4_xattr_ibody_header *header; |
578 | struct ext4_xattr_entry *entry; | |
579 | struct ext4_inode *raw_inode; | |
580 | struct ext4_iloc iloc; | |
ac27a0ec DK |
581 | size_t size; |
582 | void *end; | |
583 | int error; | |
584 | ||
19f5fb7a | 585 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 586 | return -ENODATA; |
617ba13b | 587 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
588 | if (error) |
589 | return error; | |
617ba13b | 590 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 591 | header = IHDR(inode, raw_inode); |
617ba13b | 592 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 593 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
594 | if (error) |
595 | goto cleanup; | |
6ba644b9 | 596 | entry = IFIRST(header); |
9496005d | 597 | error = xattr_find_entry(inode, &entry, end, name_index, name, 0); |
ac27a0ec DK |
598 | if (error) |
599 | goto cleanup; | |
600 | size = le32_to_cpu(entry->e_value_size); | |
54dd0e0a TT |
601 | error = -ERANGE; |
602 | if (unlikely(size > EXT4_XATTR_SIZE_MAX)) | |
603 | goto cleanup; | |
ac27a0ec | 604 | if (buffer) { |
ac27a0ec DK |
605 | if (size > buffer_size) |
606 | goto cleanup; | |
e50e5129 | 607 | if (entry->e_value_inum) { |
b9fc761e TE |
608 | error = ext4_xattr_inode_get(inode, entry, buffer, |
609 | size); | |
e50e5129 AD |
610 | if (error) |
611 | goto cleanup; | |
612 | } else { | |
54dd0e0a TT |
613 | u16 offset = le16_to_cpu(entry->e_value_offs); |
614 | void *p = (void *)IFIRST(header) + offset; | |
615 | ||
616 | if (unlikely(p + size > end)) | |
617 | goto cleanup; | |
618 | memcpy(buffer, p, size); | |
e50e5129 | 619 | } |
ac27a0ec DK |
620 | } |
621 | error = size; | |
622 | ||
623 | cleanup: | |
624 | brelse(iloc.bh); | |
625 | return error; | |
626 | } | |
627 | ||
628 | /* | |
617ba13b | 629 | * ext4_xattr_get() |
ac27a0ec DK |
630 | * |
631 | * Copy an extended attribute into the buffer | |
632 | * provided, or compute the buffer size required. | |
633 | * Buffer is NULL to compute the size of the buffer required. | |
634 | * | |
635 | * Returns a negative error number on failure, or the number of bytes | |
636 | * used / required on success. | |
637 | */ | |
638 | int | |
617ba13b | 639 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
640 | void *buffer, size_t buffer_size) |
641 | { | |
642 | int error; | |
643 | ||
0db1ff22 TT |
644 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
645 | return -EIO; | |
646 | ||
230b8c1a ZZ |
647 | if (strlen(name) > 255) |
648 | return -ERANGE; | |
649 | ||
617ba13b MC |
650 | down_read(&EXT4_I(inode)->xattr_sem); |
651 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
652 | buffer_size); |
653 | if (error == -ENODATA) | |
617ba13b | 654 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 655 | buffer_size); |
617ba13b | 656 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
657 | return error; |
658 | } | |
659 | ||
660 | static int | |
431547b3 | 661 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
662 | char *buffer, size_t buffer_size) |
663 | { | |
664 | size_t rest = buffer_size; | |
665 | ||
617ba13b | 666 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 667 | const struct xattr_handler *handler = |
617ba13b | 668 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec | 669 | |
764a5c6b AG |
670 | if (handler && (!handler->list || handler->list(dentry))) { |
671 | const char *prefix = handler->prefix ?: handler->name; | |
672 | size_t prefix_len = strlen(prefix); | |
673 | size_t size = prefix_len + entry->e_name_len + 1; | |
674 | ||
ac27a0ec DK |
675 | if (buffer) { |
676 | if (size > rest) | |
677 | return -ERANGE; | |
764a5c6b AG |
678 | memcpy(buffer, prefix, prefix_len); |
679 | buffer += prefix_len; | |
680 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
681 | buffer += entry->e_name_len; | |
682 | *buffer++ = 0; | |
ac27a0ec DK |
683 | } |
684 | rest -= size; | |
685 | } | |
686 | } | |
764a5c6b | 687 | return buffer_size - rest; /* total size */ |
ac27a0ec DK |
688 | } |
689 | ||
690 | static int | |
431547b3 | 691 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 692 | { |
2b0143b5 | 693 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
694 | struct buffer_head *bh = NULL; |
695 | int error; | |
696 | ||
697 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
698 | buffer, (long)buffer_size); | |
699 | ||
617ba13b | 700 | if (!EXT4_I(inode)->i_file_acl) |
fb265c9c | 701 | return 0; |
ace36ad4 JP |
702 | ea_idebug(inode, "reading block %llu", |
703 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
fb265c9c TT |
704 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
705 | if (IS_ERR(bh)) | |
706 | return PTR_ERR(bh); | |
ac27a0ec DK |
707 | ea_bdebug(bh, "b_count=%d, refcount=%d", |
708 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
de05ca85 TT |
709 | error = ext4_xattr_check_block(inode, bh); |
710 | if (error) | |
ac27a0ec | 711 | goto cleanup; |
47387409 | 712 | ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); |
fb265c9c TT |
713 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, |
714 | buffer_size); | |
ac27a0ec DK |
715 | cleanup: |
716 | brelse(bh); | |
ac27a0ec DK |
717 | return error; |
718 | } | |
719 | ||
720 | static int | |
431547b3 | 721 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 722 | { |
2b0143b5 | 723 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
724 | struct ext4_xattr_ibody_header *header; |
725 | struct ext4_inode *raw_inode; | |
726 | struct ext4_iloc iloc; | |
ac27a0ec DK |
727 | void *end; |
728 | int error; | |
729 | ||
19f5fb7a | 730 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 731 | return 0; |
617ba13b | 732 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
733 | if (error) |
734 | return error; | |
617ba13b | 735 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 736 | header = IHDR(inode, raw_inode); |
617ba13b | 737 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 738 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
739 | if (error) |
740 | goto cleanup; | |
431547b3 | 741 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
742 | buffer, buffer_size); |
743 | ||
744 | cleanup: | |
745 | brelse(iloc.bh); | |
746 | return error; | |
747 | } | |
748 | ||
749 | /* | |
ba7ea1d8 EB |
750 | * Inode operation listxattr() |
751 | * | |
752 | * d_inode(dentry)->i_rwsem: don't care | |
ac27a0ec DK |
753 | * |
754 | * Copy a list of attribute names into the buffer | |
755 | * provided, or compute the buffer size required. | |
756 | * Buffer is NULL to compute the size of the buffer required. | |
757 | * | |
758 | * Returns a negative error number on failure, or the number of bytes | |
759 | * used / required on success. | |
760 | */ | |
ba7ea1d8 EB |
761 | ssize_t |
762 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
ac27a0ec | 763 | { |
eaeef867 | 764 | int ret, ret2; |
ac27a0ec | 765 | |
2b0143b5 | 766 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
767 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
768 | if (ret < 0) | |
769 | goto errout; | |
770 | if (buffer) { | |
771 | buffer += ret; | |
772 | buffer_size -= ret; | |
ac27a0ec | 773 | } |
eaeef867 TT |
774 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
775 | if (ret < 0) | |
776 | goto errout; | |
777 | ret += ret2; | |
778 | errout: | |
2b0143b5 | 779 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 780 | return ret; |
ac27a0ec DK |
781 | } |
782 | ||
783 | /* | |
617ba13b | 784 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
785 | * not set, set it. |
786 | */ | |
617ba13b | 787 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
788 | struct super_block *sb) |
789 | { | |
e2b911c5 | 790 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
791 | return; |
792 | ||
5d601255 | 793 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
617ba13b | 794 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
05c2c00f | 795 | lock_buffer(EXT4_SB(sb)->s_sbh); |
e2b911c5 | 796 | ext4_set_feature_xattr(sb); |
05c2c00f JK |
797 | ext4_superblock_csum_set(sb); |
798 | unlock_buffer(EXT4_SB(sb)->s_sbh); | |
a3f5cf14 | 799 | ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); |
ac27a0ec | 800 | } |
ac27a0ec DK |
801 | } |
802 | ||
7a9ca53a TE |
803 | int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) |
804 | { | |
805 | struct ext4_iloc iloc = { .bh = NULL }; | |
806 | struct buffer_head *bh = NULL; | |
807 | struct ext4_inode *raw_inode; | |
808 | struct ext4_xattr_ibody_header *header; | |
809 | struct ext4_xattr_entry *entry; | |
810 | qsize_t ea_inode_refs = 0; | |
811 | void *end; | |
812 | int ret; | |
813 | ||
814 | lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); | |
815 | ||
816 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
817 | ret = ext4_get_inode_loc(inode, &iloc); | |
818 | if (ret) | |
819 | goto out; | |
820 | raw_inode = ext4_raw_inode(&iloc); | |
821 | header = IHDR(inode, raw_inode); | |
822 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
823 | ret = xattr_check_inode(inode, header, end); | |
824 | if (ret) | |
825 | goto out; | |
826 | ||
827 | for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); | |
828 | entry = EXT4_XATTR_NEXT(entry)) | |
829 | if (entry->e_value_inum) | |
830 | ea_inode_refs++; | |
831 | } | |
832 | ||
833 | if (EXT4_I(inode)->i_file_acl) { | |
fb265c9c TT |
834 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
835 | if (IS_ERR(bh)) { | |
836 | ret = PTR_ERR(bh); | |
7159a986 | 837 | bh = NULL; |
7a9ca53a TE |
838 | goto out; |
839 | } | |
840 | ||
de05ca85 TT |
841 | ret = ext4_xattr_check_block(inode, bh); |
842 | if (ret) | |
7a9ca53a | 843 | goto out; |
7a9ca53a TE |
844 | |
845 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
846 | entry = EXT4_XATTR_NEXT(entry)) | |
847 | if (entry->e_value_inum) | |
848 | ea_inode_refs++; | |
849 | } | |
850 | *usage = ea_inode_refs + 1; | |
851 | ret = 0; | |
852 | out: | |
853 | brelse(iloc.bh); | |
854 | brelse(bh); | |
855 | return ret; | |
856 | } | |
857 | ||
dec214d0 TE |
858 | static inline size_t round_up_cluster(struct inode *inode, size_t length) |
859 | { | |
860 | struct super_block *sb = inode->i_sb; | |
861 | size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + | |
862 | inode->i_blkbits); | |
863 | size_t mask = ~(cluster_size - 1); | |
864 | ||
865 | return (length + cluster_size - 1) & mask; | |
866 | } | |
867 | ||
868 | static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) | |
869 | { | |
870 | int err; | |
871 | ||
872 | err = dquot_alloc_inode(inode); | |
873 | if (err) | |
874 | return err; | |
875 | err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); | |
876 | if (err) | |
877 | dquot_free_inode(inode); | |
878 | return err; | |
879 | } | |
880 | ||
a6d05676 TE |
881 | static void ext4_xattr_inode_free_quota(struct inode *parent, |
882 | struct inode *ea_inode, | |
883 | size_t len) | |
dec214d0 | 884 | { |
a6d05676 TE |
885 | if (ea_inode && |
886 | ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) | |
887 | return; | |
888 | dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); | |
889 | dquot_free_inode(parent); | |
dec214d0 TE |
890 | } |
891 | ||
af65207c TE |
892 | int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, |
893 | struct buffer_head *block_bh, size_t value_len, | |
894 | bool is_create) | |
dec214d0 | 895 | { |
dec214d0 TE |
896 | int credits; |
897 | int blocks; | |
898 | ||
899 | /* | |
900 | * 1) Owner inode update | |
901 | * 2) Ref count update on old xattr block | |
902 | * 3) new xattr block | |
903 | * 4) block bitmap update for new xattr block | |
904 | * 5) group descriptor for new xattr block | |
905 | * 6) block bitmap update for old xattr block | |
906 | * 7) group descriptor for old block | |
907 | * | |
908 | * 6 & 7 can happen if we have two racing threads T_a and T_b | |
909 | * which are each trying to set an xattr on inodes I_a and I_b | |
910 | * which were both initially sharing an xattr block. | |
911 | */ | |
912 | credits = 7; | |
913 | ||
914 | /* Quota updates. */ | |
915 | credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); | |
916 | ||
917 | /* | |
918 | * In case of inline data, we may push out the data to a block, | |
919 | * so we need to reserve credits for this eventuality | |
920 | */ | |
af65207c | 921 | if (inode && ext4_has_inline_data(inode)) |
dec214d0 TE |
922 | credits += ext4_writepage_trans_blocks(inode) + 1; |
923 | ||
924 | /* We are done if ea_inode feature is not enabled. */ | |
925 | if (!ext4_has_feature_ea_inode(sb)) | |
926 | return credits; | |
927 | ||
928 | /* New ea_inode, inode map, block bitmap, group descriptor. */ | |
929 | credits += 4; | |
930 | ||
931 | /* Data blocks. */ | |
932 | blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; | |
933 | ||
934 | /* Indirection block or one level of extent tree. */ | |
935 | blocks += 1; | |
936 | ||
937 | /* Block bitmap and group descriptor updates for each block. */ | |
938 | credits += blocks * 2; | |
939 | ||
940 | /* Blocks themselves. */ | |
941 | credits += blocks; | |
942 | ||
af65207c TE |
943 | if (!is_create) { |
944 | /* Dereference ea_inode holding old xattr value. | |
945 | * Old ea_inode, inode map, block bitmap, group descriptor. | |
946 | */ | |
947 | credits += 4; | |
dec214d0 | 948 | |
af65207c TE |
949 | /* Data blocks for old ea_inode. */ |
950 | blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; | |
dec214d0 | 951 | |
af65207c TE |
952 | /* Indirection block or one level of extent tree for old |
953 | * ea_inode. | |
954 | */ | |
955 | blocks += 1; | |
dec214d0 | 956 | |
af65207c TE |
957 | /* Block bitmap and group descriptor updates for each block. */ |
958 | credits += blocks * 2; | |
959 | } | |
dec214d0 TE |
960 | |
961 | /* We may need to clone the existing xattr block in which case we need | |
962 | * to increment ref counts for existing ea_inodes referenced by it. | |
963 | */ | |
964 | if (block_bh) { | |
965 | struct ext4_xattr_entry *entry = BFIRST(block_bh); | |
966 | ||
967 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) | |
968 | if (entry->e_value_inum) | |
969 | /* Ref count update on ea_inode. */ | |
970 | credits += 1; | |
971 | } | |
972 | return credits; | |
973 | } | |
974 | ||
dec214d0 TE |
975 | static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, |
976 | int ref_change) | |
977 | { | |
978 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); | |
979 | struct ext4_iloc iloc; | |
980 | s64 ref_count; | |
981 | u32 hash; | |
982 | int ret; | |
983 | ||
984 | inode_lock(ea_inode); | |
985 | ||
986 | ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); | |
1bfc204d | 987 | if (ret) |
dec214d0 | 988 | goto out; |
dec214d0 TE |
989 | |
990 | ref_count = ext4_xattr_inode_get_ref(ea_inode); | |
991 | ref_count += ref_change; | |
992 | ext4_xattr_inode_set_ref(ea_inode, ref_count); | |
993 | ||
994 | if (ref_change > 0) { | |
995 | WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", | |
996 | ea_inode->i_ino, ref_count); | |
997 | ||
998 | if (ref_count == 1) { | |
999 | WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", | |
1000 | ea_inode->i_ino, ea_inode->i_nlink); | |
1001 | ||
1002 | set_nlink(ea_inode, 1); | |
1003 | ext4_orphan_del(handle, ea_inode); | |
1004 | ||
cdb7ee4c TE |
1005 | if (ea_inode_cache) { |
1006 | hash = ext4_xattr_inode_get_hash(ea_inode); | |
1007 | mb_cache_entry_create(ea_inode_cache, | |
1008 | GFP_NOFS, hash, | |
1009 | ea_inode->i_ino, | |
1010 | true /* reusable */); | |
1011 | } | |
dec214d0 TE |
1012 | } |
1013 | } else { | |
1014 | WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", | |
1015 | ea_inode->i_ino, ref_count); | |
1016 | ||
1017 | if (ref_count == 0) { | |
1018 | WARN_ONCE(ea_inode->i_nlink != 1, | |
1019 | "EA inode %lu i_nlink=%u", | |
1020 | ea_inode->i_ino, ea_inode->i_nlink); | |
1021 | ||
1022 | clear_nlink(ea_inode); | |
1023 | ext4_orphan_add(handle, ea_inode); | |
1024 | ||
cdb7ee4c TE |
1025 | if (ea_inode_cache) { |
1026 | hash = ext4_xattr_inode_get_hash(ea_inode); | |
1027 | mb_cache_entry_delete(ea_inode_cache, hash, | |
1028 | ea_inode->i_ino); | |
1029 | } | |
dec214d0 TE |
1030 | } |
1031 | } | |
1032 | ||
1033 | ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); | |
dec214d0 TE |
1034 | if (ret) |
1035 | ext4_warning_inode(ea_inode, | |
1036 | "ext4_mark_iloc_dirty() failed ret=%d", ret); | |
1037 | out: | |
dec214d0 TE |
1038 | inode_unlock(ea_inode); |
1039 | return ret; | |
1040 | } | |
1041 | ||
1042 | static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) | |
1043 | { | |
1044 | return ext4_xattr_inode_update_ref(handle, ea_inode, 1); | |
1045 | } | |
1046 | ||
1047 | static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) | |
1048 | { | |
1049 | return ext4_xattr_inode_update_ref(handle, ea_inode, -1); | |
1050 | } | |
1051 | ||
1052 | static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, | |
1053 | struct ext4_xattr_entry *first) | |
1054 | { | |
1055 | struct inode *ea_inode; | |
1056 | struct ext4_xattr_entry *entry; | |
1057 | struct ext4_xattr_entry *failed_entry; | |
1058 | unsigned int ea_ino; | |
1059 | int err, saved_err; | |
1060 | ||
1061 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1062 | entry = EXT4_XATTR_NEXT(entry)) { | |
1063 | if (!entry->e_value_inum) | |
1064 | continue; | |
1065 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1066 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1067 | le32_to_cpu(entry->e_hash), | |
1068 | &ea_inode); | |
dec214d0 TE |
1069 | if (err) |
1070 | goto cleanup; | |
1071 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1072 | if (err) { | |
1073 | ext4_warning_inode(ea_inode, "inc ref error %d", err); | |
1074 | iput(ea_inode); | |
1075 | goto cleanup; | |
1076 | } | |
1077 | iput(ea_inode); | |
1078 | } | |
1079 | return 0; | |
1080 | ||
1081 | cleanup: | |
1082 | saved_err = err; | |
1083 | failed_entry = entry; | |
1084 | ||
1085 | for (entry = first; entry != failed_entry; | |
1086 | entry = EXT4_XATTR_NEXT(entry)) { | |
1087 | if (!entry->e_value_inum) | |
1088 | continue; | |
1089 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1090 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1091 | le32_to_cpu(entry->e_hash), | |
1092 | &ea_inode); | |
dec214d0 TE |
1093 | if (err) { |
1094 | ext4_warning(parent->i_sb, | |
1095 | "cleanup ea_ino %u iget error %d", ea_ino, | |
1096 | err); | |
1097 | continue; | |
1098 | } | |
1099 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1100 | if (err) | |
1101 | ext4_warning_inode(ea_inode, "cleanup dec ref error %d", | |
1102 | err); | |
1103 | iput(ea_inode); | |
1104 | } | |
1105 | return saved_err; | |
1106 | } | |
1107 | ||
a4130367 JK |
1108 | static int ext4_xattr_restart_fn(handle_t *handle, struct inode *inode, |
1109 | struct buffer_head *bh, bool block_csum, bool dirty) | |
1110 | { | |
1111 | int error; | |
1112 | ||
1113 | if (bh && dirty) { | |
1114 | if (block_csum) | |
1115 | ext4_xattr_block_csum_set(inode, bh); | |
1116 | error = ext4_handle_dirty_metadata(handle, NULL, bh); | |
1117 | if (error) { | |
1118 | ext4_warning(inode->i_sb, "Handle metadata (error %d)", | |
1119 | error); | |
1120 | return error; | |
1121 | } | |
1122 | } | |
1123 | return 0; | |
1124 | } | |
1125 | ||
30a7eb97 | 1126 | static void |
dec214d0 TE |
1127 | ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, |
1128 | struct buffer_head *bh, | |
1129 | struct ext4_xattr_entry *first, bool block_csum, | |
1130 | struct ext4_xattr_inode_array **ea_inode_array, | |
1131 | int extra_credits, bool skip_quota) | |
30a7eb97 TE |
1132 | { |
1133 | struct inode *ea_inode; | |
1134 | struct ext4_xattr_entry *entry; | |
1135 | bool dirty = false; | |
1136 | unsigned int ea_ino; | |
1137 | int err; | |
1138 | int credits; | |
1139 | ||
1140 | /* One credit for dec ref on ea_inode, one for orphan list addition, */ | |
1141 | credits = 2 + extra_credits; | |
1142 | ||
1143 | for (entry = first; !IS_LAST_ENTRY(entry); | |
1144 | entry = EXT4_XATTR_NEXT(entry)) { | |
1145 | if (!entry->e_value_inum) | |
1146 | continue; | |
1147 | ea_ino = le32_to_cpu(entry->e_value_inum); | |
a6d05676 TE |
1148 | err = ext4_xattr_inode_iget(parent, ea_ino, |
1149 | le32_to_cpu(entry->e_hash), | |
1150 | &ea_inode); | |
30a7eb97 TE |
1151 | if (err) |
1152 | continue; | |
1153 | ||
1154 | err = ext4_expand_inode_array(ea_inode_array, ea_inode); | |
1155 | if (err) { | |
1156 | ext4_warning_inode(ea_inode, | |
1157 | "Expand inode array err=%d", err); | |
1158 | iput(ea_inode); | |
1159 | continue; | |
1160 | } | |
1161 | ||
a4130367 | 1162 | err = ext4_journal_ensure_credits_fn(handle, credits, credits, |
83448bdf | 1163 | ext4_free_metadata_revoke_credits(parent->i_sb, 1), |
a4130367 JK |
1164 | ext4_xattr_restart_fn(handle, parent, bh, block_csum, |
1165 | dirty)); | |
1166 | if (err < 0) { | |
30a7eb97 TE |
1167 | ext4_warning_inode(ea_inode, "Ensure credits err=%d", |
1168 | err); | |
1169 | continue; | |
1170 | } | |
a4130367 JK |
1171 | if (err > 0) { |
1172 | err = ext4_journal_get_write_access(handle, bh); | |
1173 | if (err) { | |
1174 | ext4_warning_inode(ea_inode, | |
1175 | "Re-get write access err=%d", | |
1176 | err); | |
1177 | continue; | |
1178 | } | |
1179 | } | |
30a7eb97 | 1180 | |
dec214d0 TE |
1181 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); |
1182 | if (err) { | |
1183 | ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", | |
1184 | err); | |
1185 | continue; | |
1186 | } | |
1187 | ||
1188 | if (!skip_quota) | |
a6d05676 | 1189 | ext4_xattr_inode_free_quota(parent, ea_inode, |
dec214d0 | 1190 | le32_to_cpu(entry->e_value_size)); |
30a7eb97 TE |
1191 | |
1192 | /* | |
1193 | * Forget about ea_inode within the same transaction that | |
1194 | * decrements the ref count. This avoids duplicate decrements in | |
1195 | * case the rest of the work spills over to subsequent | |
1196 | * transactions. | |
1197 | */ | |
1198 | entry->e_value_inum = 0; | |
1199 | entry->e_value_size = 0; | |
1200 | ||
1201 | dirty = true; | |
1202 | } | |
1203 | ||
1204 | if (dirty) { | |
1205 | /* | |
1206 | * Note that we are deliberately skipping csum calculation for | |
1207 | * the final update because we do not expect any journal | |
1208 | * restarts until xattr block is freed. | |
1209 | */ | |
1210 | ||
1211 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
1212 | if (err) | |
1213 | ext4_warning_inode(parent, | |
1214 | "handle dirty metadata err=%d", err); | |
1215 | } | |
1216 | } | |
1217 | ||
ac27a0ec | 1218 | /* |
ec4cb1aa JK |
1219 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
1220 | * otherwise free the block. | |
ac27a0ec DK |
1221 | */ |
1222 | static void | |
617ba13b | 1223 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
dec214d0 TE |
1224 | struct buffer_head *bh, |
1225 | struct ext4_xattr_inode_array **ea_inode_array, | |
1226 | int extra_credits) | |
ac27a0ec | 1227 | { |
47387409 | 1228 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
6048c64b | 1229 | u32 hash, ref; |
8a2bfdcb | 1230 | int error = 0; |
ac27a0ec | 1231 | |
5d601255 | 1232 | BUFFER_TRACE(bh, "get_write_access"); |
8a2bfdcb MC |
1233 | error = ext4_journal_get_write_access(handle, bh); |
1234 | if (error) | |
1235 | goto out; | |
1236 | ||
1237 | lock_buffer(bh); | |
6048c64b AG |
1238 | hash = le32_to_cpu(BHDR(bh)->h_hash); |
1239 | ref = le32_to_cpu(BHDR(bh)->h_refcount); | |
1240 | if (ref == 1) { | |
ac27a0ec | 1241 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
1242 | /* |
1243 | * This must happen under buffer lock for | |
1244 | * ext4_xattr_block_set() to reliably detect freed block | |
1245 | */ | |
cdb7ee4c TE |
1246 | if (ea_block_cache) |
1247 | mb_cache_entry_delete(ea_block_cache, hash, | |
1248 | bh->b_blocknr); | |
ac27a0ec | 1249 | get_bh(bh); |
ec4cb1aa | 1250 | unlock_buffer(bh); |
dec214d0 TE |
1251 | |
1252 | if (ext4_has_feature_ea_inode(inode->i_sb)) | |
1253 | ext4_xattr_inode_dec_ref_all(handle, inode, bh, | |
1254 | BFIRST(bh), | |
1255 | true /* block_csum */, | |
1256 | ea_inode_array, | |
1257 | extra_credits, | |
1258 | true /* skip_quota */); | |
e6362609 TT |
1259 | ext4_free_blocks(handle, inode, bh, 0, 1, |
1260 | EXT4_FREE_BLOCKS_METADATA | | |
1261 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 1262 | } else { |
6048c64b AG |
1263 | ref--; |
1264 | BHDR(bh)->h_refcount = cpu_to_le32(ref); | |
1265 | if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { | |
1266 | struct mb_cache_entry *ce; | |
1267 | ||
cdb7ee4c TE |
1268 | if (ea_block_cache) { |
1269 | ce = mb_cache_entry_get(ea_block_cache, hash, | |
1270 | bh->b_blocknr); | |
1271 | if (ce) { | |
1272 | ce->e_reusable = 1; | |
1273 | mb_cache_entry_put(ea_block_cache, ce); | |
1274 | } | |
6048c64b AG |
1275 | } |
1276 | } | |
1277 | ||
dac7a4b4 | 1278 | ext4_xattr_block_csum_set(inode, bh); |
ec4cb1aa JK |
1279 | /* |
1280 | * Beware of this ugliness: Releasing of xattr block references | |
1281 | * from different inodes can race and so we have to protect | |
1282 | * from a race where someone else frees the block (and releases | |
1283 | * its journal_head) before we are done dirtying the buffer. In | |
1284 | * nojournal mode this race is harmless and we actually cannot | |
dac7a4b4 | 1285 | * call ext4_handle_dirty_metadata() with locked buffer as |
ec4cb1aa JK |
1286 | * that function can call sync_dirty_buffer() so for that case |
1287 | * we handle the dirtying after unlocking the buffer. | |
1288 | */ | |
1289 | if (ext4_handle_valid(handle)) | |
dac7a4b4 | 1290 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
c1bb05a6 | 1291 | unlock_buffer(bh); |
ec4cb1aa | 1292 | if (!ext4_handle_valid(handle)) |
dac7a4b4 | 1293 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
8a2bfdcb | 1294 | if (IS_SYNC(inode)) |
0390131b | 1295 | ext4_handle_sync(handle); |
1231b3a1 | 1296 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
1297 | ea_bdebug(bh, "refcount now=%d; releasing", |
1298 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 1299 | } |
8a2bfdcb MC |
1300 | out: |
1301 | ext4_std_error(inode->i_sb, error); | |
1302 | return; | |
ac27a0ec DK |
1303 | } |
1304 | ||
6dd4ee7c KS |
1305 | /* |
1306 | * Find the available free space for EAs. This also returns the total number of | |
1307 | * bytes used by EA entries. | |
1308 | */ | |
1309 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
1310 | size_t *min_offs, void *base, int *total) | |
1311 | { | |
1312 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 1313 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
1314 | size_t offs = le16_to_cpu(last->e_value_offs); |
1315 | if (offs < *min_offs) | |
1316 | *min_offs = offs; | |
1317 | } | |
7b1b2c1b TT |
1318 | if (total) |
1319 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
1320 | } |
1321 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
1322 | } | |
1323 | ||
e50e5129 AD |
1324 | /* |
1325 | * Write the value of the EA in an inode. | |
1326 | */ | |
1327 | static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, | |
1328 | const void *buf, int bufsize) | |
1329 | { | |
1330 | struct buffer_head *bh = NULL; | |
1331 | unsigned long block = 0; | |
dec214d0 TE |
1332 | int blocksize = ea_inode->i_sb->s_blocksize; |
1333 | int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; | |
e50e5129 | 1334 | int csize, wsize = 0; |
4209ae12 | 1335 | int ret = 0, ret2 = 0; |
e50e5129 AD |
1336 | int retries = 0; |
1337 | ||
1338 | retry: | |
1339 | while (ret >= 0 && ret < max_blocks) { | |
1340 | struct ext4_map_blocks map; | |
1341 | map.m_lblk = block += ret; | |
1342 | map.m_len = max_blocks -= ret; | |
1343 | ||
1344 | ret = ext4_map_blocks(handle, ea_inode, &map, | |
1345 | EXT4_GET_BLOCKS_CREATE); | |
1346 | if (ret <= 0) { | |
1347 | ext4_mark_inode_dirty(handle, ea_inode); | |
1348 | if (ret == -ENOSPC && | |
1349 | ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { | |
1350 | ret = 0; | |
1351 | goto retry; | |
1352 | } | |
1353 | break; | |
1354 | } | |
1355 | } | |
1356 | ||
1357 | if (ret < 0) | |
1358 | return ret; | |
1359 | ||
1360 | block = 0; | |
1361 | while (wsize < bufsize) { | |
e0f49d27 | 1362 | brelse(bh); |
e50e5129 AD |
1363 | csize = (bufsize - wsize) > blocksize ? blocksize : |
1364 | bufsize - wsize; | |
1365 | bh = ext4_getblk(handle, ea_inode, block, 0); | |
1366 | if (IS_ERR(bh)) | |
1367 | return PTR_ERR(bh); | |
eb6984fa VA |
1368 | if (!bh) { |
1369 | WARN_ON_ONCE(1); | |
1370 | EXT4_ERROR_INODE(ea_inode, | |
1371 | "ext4_getblk() return bh = NULL"); | |
1372 | return -EFSCORRUPTED; | |
1373 | } | |
e50e5129 AD |
1374 | ret = ext4_journal_get_write_access(handle, bh); |
1375 | if (ret) | |
1376 | goto out; | |
1377 | ||
1378 | memcpy(bh->b_data, buf, csize); | |
1379 | set_buffer_uptodate(bh); | |
1380 | ext4_handle_dirty_metadata(handle, ea_inode, bh); | |
1381 | ||
1382 | buf += csize; | |
1383 | wsize += csize; | |
1384 | block += 1; | |
1385 | } | |
1386 | ||
1387 | inode_lock(ea_inode); | |
1388 | i_size_write(ea_inode, wsize); | |
1389 | ext4_update_i_disksize(ea_inode, wsize); | |
1390 | inode_unlock(ea_inode); | |
1391 | ||
4209ae12 HS |
1392 | ret2 = ext4_mark_inode_dirty(handle, ea_inode); |
1393 | if (unlikely(ret2 && !ret)) | |
1394 | ret = ret2; | |
e50e5129 AD |
1395 | |
1396 | out: | |
1397 | brelse(bh); | |
1398 | ||
1399 | return ret; | |
1400 | } | |
1401 | ||
1402 | /* | |
1403 | * Create an inode to store the value of a large EA. | |
1404 | */ | |
1405 | static struct inode *ext4_xattr_inode_create(handle_t *handle, | |
dec214d0 | 1406 | struct inode *inode, u32 hash) |
e50e5129 AD |
1407 | { |
1408 | struct inode *ea_inode = NULL; | |
9e1ba001 | 1409 | uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; |
bd3b963b | 1410 | int err; |
e50e5129 AD |
1411 | |
1412 | /* | |
1413 | * Let the next inode be the goal, so we try and allocate the EA inode | |
1414 | * in the same group, or nearby one. | |
1415 | */ | |
1416 | ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, | |
9e1ba001 | 1417 | S_IFREG | 0600, NULL, inode->i_ino + 1, owner, |
1b917ed8 | 1418 | EXT4_EA_INODE_FL); |
e50e5129 AD |
1419 | if (!IS_ERR(ea_inode)) { |
1420 | ea_inode->i_op = &ext4_file_inode_operations; | |
1421 | ea_inode->i_fop = &ext4_file_operations; | |
1422 | ext4_set_aops(ea_inode); | |
33d201e0 | 1423 | ext4_xattr_inode_set_class(ea_inode); |
e50e5129 | 1424 | unlock_new_inode(ea_inode); |
dec214d0 TE |
1425 | ext4_xattr_inode_set_ref(ea_inode, 1); |
1426 | ext4_xattr_inode_set_hash(ea_inode, hash); | |
1427 | err = ext4_mark_inode_dirty(handle, ea_inode); | |
1428 | if (!err) | |
1429 | err = ext4_inode_attach_jinode(ea_inode); | |
bd3b963b TE |
1430 | if (err) { |
1431 | iput(ea_inode); | |
1432 | return ERR_PTR(err); | |
1433 | } | |
dec214d0 TE |
1434 | |
1435 | /* | |
1436 | * Xattr inodes are shared therefore quota charging is performed | |
1437 | * at a higher level. | |
1438 | */ | |
1439 | dquot_free_inode(ea_inode); | |
1440 | dquot_drop(ea_inode); | |
1441 | inode_lock(ea_inode); | |
1442 | ea_inode->i_flags |= S_NOQUOTA; | |
1443 | inode_unlock(ea_inode); | |
e50e5129 AD |
1444 | } |
1445 | ||
1446 | return ea_inode; | |
1447 | } | |
1448 | ||
dec214d0 TE |
1449 | static struct inode * |
1450 | ext4_xattr_inode_cache_find(struct inode *inode, const void *value, | |
1451 | size_t value_len, u32 hash) | |
e50e5129 | 1452 | { |
dec214d0 TE |
1453 | struct inode *ea_inode; |
1454 | struct mb_cache_entry *ce; | |
1455 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); | |
1456 | void *ea_data; | |
1457 | ||
cdb7ee4c TE |
1458 | if (!ea_inode_cache) |
1459 | return NULL; | |
1460 | ||
dec214d0 TE |
1461 | ce = mb_cache_entry_find_first(ea_inode_cache, hash); |
1462 | if (!ce) | |
1463 | return NULL; | |
1464 | ||
163f0ec1 JK |
1465 | WARN_ON_ONCE(ext4_handle_valid(journal_current_handle()) && |
1466 | !(current->flags & PF_MEMALLOC_NOFS)); | |
1467 | ||
71b565ce | 1468 | ea_data = kvmalloc(value_len, GFP_KERNEL); |
dec214d0 TE |
1469 | if (!ea_data) { |
1470 | mb_cache_entry_put(ea_inode_cache, ce); | |
1471 | return NULL; | |
1472 | } | |
e50e5129 | 1473 | |
dec214d0 | 1474 | while (ce) { |
8a363970 TT |
1475 | ea_inode = ext4_iget(inode->i_sb, ce->e_value, |
1476 | EXT4_IGET_NORMAL); | |
dec214d0 TE |
1477 | if (!IS_ERR(ea_inode) && |
1478 | !is_bad_inode(ea_inode) && | |
1479 | (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && | |
1480 | i_size_read(ea_inode) == value_len && | |
1481 | !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && | |
b9fc761e TE |
1482 | !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, |
1483 | value_len) && | |
dec214d0 TE |
1484 | !memcmp(value, ea_data, value_len)) { |
1485 | mb_cache_entry_touch(ea_inode_cache, ce); | |
1486 | mb_cache_entry_put(ea_inode_cache, ce); | |
1487 | kvfree(ea_data); | |
1488 | return ea_inode; | |
1489 | } | |
e50e5129 | 1490 | |
dec214d0 TE |
1491 | if (!IS_ERR(ea_inode)) |
1492 | iput(ea_inode); | |
1493 | ce = mb_cache_entry_find_next(ea_inode_cache, ce); | |
1494 | } | |
1495 | kvfree(ea_data); | |
1496 | return NULL; | |
e50e5129 AD |
1497 | } |
1498 | ||
1499 | /* | |
1500 | * Add value of the EA in an inode. | |
1501 | */ | |
dec214d0 TE |
1502 | static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, |
1503 | const void *value, size_t value_len, | |
1504 | struct inode **ret_inode) | |
e50e5129 AD |
1505 | { |
1506 | struct inode *ea_inode; | |
dec214d0 | 1507 | u32 hash; |
e50e5129 AD |
1508 | int err; |
1509 | ||
dec214d0 TE |
1510 | hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); |
1511 | ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); | |
1512 | if (ea_inode) { | |
1513 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1514 | if (err) { | |
1515 | iput(ea_inode); | |
1516 | return err; | |
1517 | } | |
1518 | ||
1519 | *ret_inode = ea_inode; | |
1520 | return 0; | |
1521 | } | |
1522 | ||
e50e5129 | 1523 | /* Create an inode for the EA value */ |
dec214d0 | 1524 | ea_inode = ext4_xattr_inode_create(handle, inode, hash); |
e50e5129 AD |
1525 | if (IS_ERR(ea_inode)) |
1526 | return PTR_ERR(ea_inode); | |
1527 | ||
1528 | err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); | |
dec214d0 TE |
1529 | if (err) { |
1530 | ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1531 | iput(ea_inode); | |
1532 | return err; | |
1533 | } | |
e50e5129 | 1534 | |
cdb7ee4c TE |
1535 | if (EA_INODE_CACHE(inode)) |
1536 | mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, | |
1537 | ea_inode->i_ino, true /* reusable */); | |
e50e5129 | 1538 | |
dec214d0 TE |
1539 | *ret_inode = ea_inode; |
1540 | return 0; | |
e50e5129 AD |
1541 | } |
1542 | ||
9c6e7853 TE |
1543 | /* |
1544 | * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode | |
1545 | * feature is enabled. | |
1546 | */ | |
1547 | #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) | |
1548 | ||
e50e5129 AD |
1549 | static int ext4_xattr_set_entry(struct ext4_xattr_info *i, |
1550 | struct ext4_xattr_search *s, | |
daf83281 TE |
1551 | handle_t *handle, struct inode *inode, |
1552 | bool is_block) | |
ac27a0ec | 1553 | { |
5369a762 | 1554 | struct ext4_xattr_entry *last, *next; |
dec214d0 TE |
1555 | struct ext4_xattr_entry *here = s->here; |
1556 | size_t min_offs = s->end - s->base, name_len = strlen(i->name); | |
e50e5129 | 1557 | int in_inode = i->in_inode; |
dec214d0 TE |
1558 | struct inode *old_ea_inode = NULL; |
1559 | struct inode *new_ea_inode = NULL; | |
1560 | size_t old_size, new_size; | |
1561 | int ret; | |
1562 | ||
1563 | /* Space used by old and new values. */ | |
1564 | old_size = (!s->not_found && !here->e_value_inum) ? | |
1565 | EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; | |
1566 | new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; | |
1567 | ||
1568 | /* | |
1569 | * Optimization for the simple case when old and new values have the | |
1570 | * same padded sizes. Not applicable if external inodes are involved. | |
1571 | */ | |
1572 | if (new_size && new_size == old_size) { | |
1573 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1574 | void *val = s->base + offs; | |
1575 | ||
1576 | here->e_value_size = cpu_to_le32(i->value_len); | |
1577 | if (i->value == EXT4_ZERO_XATTR_VALUE) { | |
1578 | memset(val, 0, new_size); | |
1579 | } else { | |
1580 | memcpy(val, i->value, i->value_len); | |
1581 | /* Clear padding bytes. */ | |
1582 | memset(val + i->value_len, 0, new_size - i->value_len); | |
1583 | } | |
32aaf194 | 1584 | goto update_hash; |
dec214d0 | 1585 | } |
e50e5129 | 1586 | |
ac27a0ec DK |
1587 | /* Compute min_offs and last. */ |
1588 | last = s->first; | |
5369a762 TT |
1589 | for (; !IS_LAST_ENTRY(last); last = next) { |
1590 | next = EXT4_XATTR_NEXT(last); | |
1591 | if ((void *)next >= s->end) { | |
1592 | EXT4_ERROR_INODE(inode, "corrupted xattr entries"); | |
1593 | ret = -EFSCORRUPTED; | |
1594 | goto out; | |
1595 | } | |
e50e5129 | 1596 | if (!last->e_value_inum && last->e_value_size) { |
ac27a0ec DK |
1597 | size_t offs = le16_to_cpu(last->e_value_offs); |
1598 | if (offs < min_offs) | |
1599 | min_offs = offs; | |
1600 | } | |
1601 | } | |
dec214d0 TE |
1602 | |
1603 | /* Check whether we have enough space. */ | |
ac27a0ec | 1604 | if (i->value) { |
dec214d0 | 1605 | size_t free; |
e50e5129 | 1606 | |
dec214d0 TE |
1607 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); |
1608 | if (!s->not_found) | |
1609 | free += EXT4_XATTR_LEN(name_len) + old_size; | |
e50e5129 | 1610 | |
dec214d0 TE |
1611 | if (free < EXT4_XATTR_LEN(name_len) + new_size) { |
1612 | ret = -ENOSPC; | |
1613 | goto out; | |
1614 | } | |
9c6e7853 TE |
1615 | |
1616 | /* | |
1617 | * If storing the value in an external inode is an option, | |
1618 | * reserve space for xattr entries/names in the external | |
1619 | * attribute block so that a long value does not occupy the | |
3088e5a5 | 1620 | * whole space and prevent further entries being added. |
9c6e7853 | 1621 | */ |
daf83281 TE |
1622 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
1623 | new_size && is_block && | |
9c6e7853 TE |
1624 | (min_offs + old_size - new_size) < |
1625 | EXT4_XATTR_BLOCK_RESERVE(inode)) { | |
1626 | ret = -ENOSPC; | |
1627 | goto out; | |
1628 | } | |
ac27a0ec DK |
1629 | } |
1630 | ||
dec214d0 TE |
1631 | /* |
1632 | * Getting access to old and new ea inodes is subject to failures. | |
1633 | * Finish that work before doing any modifications to the xattr data. | |
1634 | */ | |
1635 | if (!s->not_found && here->e_value_inum) { | |
1636 | ret = ext4_xattr_inode_iget(inode, | |
1637 | le32_to_cpu(here->e_value_inum), | |
a6d05676 | 1638 | le32_to_cpu(here->e_hash), |
dec214d0 TE |
1639 | &old_ea_inode); |
1640 | if (ret) { | |
1641 | old_ea_inode = NULL; | |
1642 | goto out; | |
1643 | } | |
1644 | } | |
1645 | if (i->value && in_inode) { | |
1646 | WARN_ON_ONCE(!i->value_len); | |
ac27a0ec | 1647 | |
dec214d0 TE |
1648 | ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); |
1649 | if (ret) | |
1650 | goto out; | |
1651 | ||
1652 | ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, | |
1653 | i->value_len, | |
1654 | &new_ea_inode); | |
1655 | if (ret) { | |
1656 | new_ea_inode = NULL; | |
a6d05676 | 1657 | ext4_xattr_inode_free_quota(inode, NULL, i->value_len); |
dec214d0 | 1658 | goto out; |
ac27a0ec | 1659 | } |
dec214d0 TE |
1660 | } |
1661 | ||
1662 | if (old_ea_inode) { | |
1663 | /* We are ready to release ref count on the old_ea_inode. */ | |
1664 | ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); | |
1665 | if (ret) { | |
1666 | /* Release newly required ref count on new_ea_inode. */ | |
1667 | if (new_ea_inode) { | |
1668 | int err; | |
1669 | ||
1670 | err = ext4_xattr_inode_dec_ref(handle, | |
1671 | new_ea_inode); | |
1672 | if (err) | |
1673 | ext4_warning_inode(new_ea_inode, | |
1674 | "dec ref new_ea_inode err=%d", | |
1675 | err); | |
a6d05676 | 1676 | ext4_xattr_inode_free_quota(inode, new_ea_inode, |
dec214d0 TE |
1677 | i->value_len); |
1678 | } | |
1679 | goto out; | |
e50e5129 | 1680 | } |
dec214d0 | 1681 | |
a6d05676 | 1682 | ext4_xattr_inode_free_quota(inode, old_ea_inode, |
dec214d0 TE |
1683 | le32_to_cpu(here->e_value_size)); |
1684 | } | |
1685 | ||
1686 | /* No failures allowed past this point. */ | |
1687 | ||
e5d01196 | 1688 | if (!s->not_found && here->e_value_size && !here->e_value_inum) { |
dec214d0 TE |
1689 | /* Remove the old value. */ |
1690 | void *first_val = s->base + min_offs; | |
1691 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1692 | void *val = s->base + offs; | |
1693 | ||
1694 | memmove(first_val + old_size, first_val, val - first_val); | |
1695 | memset(first_val, 0, old_size); | |
1696 | min_offs += old_size; | |
1697 | ||
1698 | /* Adjust all value offsets. */ | |
1699 | last = s->first; | |
1700 | while (!IS_LAST_ENTRY(last)) { | |
1701 | size_t o = le16_to_cpu(last->e_value_offs); | |
1702 | ||
1703 | if (!last->e_value_inum && | |
1704 | last->e_value_size && o < offs) | |
1705 | last->e_value_offs = cpu_to_le16(o + old_size); | |
1706 | last = EXT4_XATTR_NEXT(last); | |
ac27a0ec DK |
1707 | } |
1708 | } | |
1709 | ||
dec214d0 TE |
1710 | if (!i->value) { |
1711 | /* Remove old name. */ | |
1712 | size_t size = EXT4_XATTR_LEN(name_len); | |
1713 | ||
1714 | last = ENTRY((void *)last - size); | |
1715 | memmove(here, (void *)here + size, | |
1716 | (void *)last - (void *)here + sizeof(__u32)); | |
1717 | memset(last, 0, size); | |
1718 | } else if (s->not_found) { | |
1719 | /* Insert new name. */ | |
1720 | size_t size = EXT4_XATTR_LEN(name_len); | |
1721 | size_t rest = (void *)last - (void *)here + sizeof(__u32); | |
1722 | ||
1723 | memmove((void *)here + size, here, rest); | |
1724 | memset(here, 0, size); | |
1725 | here->e_name_index = i->name_index; | |
1726 | here->e_name_len = name_len; | |
1727 | memcpy(here->e_name, i->name, name_len); | |
1728 | } else { | |
1729 | /* This is an update, reset value info. */ | |
1730 | here->e_value_inum = 0; | |
1731 | here->e_value_offs = 0; | |
1732 | here->e_value_size = 0; | |
1733 | } | |
1734 | ||
ac27a0ec | 1735 | if (i->value) { |
dec214d0 | 1736 | /* Insert new value. */ |
e50e5129 | 1737 | if (in_inode) { |
dec214d0 | 1738 | here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); |
e50e5129 | 1739 | } else if (i->value_len) { |
dec214d0 TE |
1740 | void *val = s->base + min_offs - new_size; |
1741 | ||
1742 | here->e_value_offs = cpu_to_le16(min_offs - new_size); | |
bd9926e8 | 1743 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
dec214d0 | 1744 | memset(val, 0, new_size); |
bd9926e8 | 1745 | } else { |
bd9926e8 | 1746 | memcpy(val, i->value, i->value_len); |
dec214d0 TE |
1747 | /* Clear padding bytes. */ |
1748 | memset(val + i->value_len, 0, | |
1749 | new_size - i->value_len); | |
bd9926e8 | 1750 | } |
ac27a0ec | 1751 | } |
dec214d0 | 1752 | here->e_value_size = cpu_to_le32(i->value_len); |
ac27a0ec | 1753 | } |
daf83281 | 1754 | |
32aaf194 | 1755 | update_hash: |
b9fc761e TE |
1756 | if (i->value) { |
1757 | __le32 hash = 0; | |
1758 | ||
1759 | /* Entry hash calculation. */ | |
1760 | if (in_inode) { | |
1761 | __le32 crc32c_hash; | |
1762 | ||
1763 | /* | |
1764 | * Feed crc32c hash instead of the raw value for entry | |
1765 | * hash calculation. This is to avoid walking | |
1766 | * potentially long value buffer again. | |
1767 | */ | |
1768 | crc32c_hash = cpu_to_le32( | |
1769 | ext4_xattr_inode_get_hash(new_ea_inode)); | |
1770 | hash = ext4_xattr_hash_entry(here->e_name, | |
1771 | here->e_name_len, | |
1772 | &crc32c_hash, 1); | |
1773 | } else if (is_block) { | |
32aaf194 TE |
1774 | __le32 *value = s->base + le16_to_cpu( |
1775 | here->e_value_offs); | |
b9fc761e TE |
1776 | |
1777 | hash = ext4_xattr_hash_entry(here->e_name, | |
1778 | here->e_name_len, value, | |
1779 | new_size >> 2); | |
1780 | } | |
1781 | here->e_hash = hash; | |
daf83281 TE |
1782 | } |
1783 | ||
b9fc761e TE |
1784 | if (is_block) |
1785 | ext4_xattr_rehash((struct ext4_xattr_header *)s->base); | |
1786 | ||
dec214d0 | 1787 | ret = 0; |
e50e5129 | 1788 | out: |
dec214d0 TE |
1789 | iput(old_ea_inode); |
1790 | iput(new_ea_inode); | |
1791 | return ret; | |
ac27a0ec DK |
1792 | } |
1793 | ||
617ba13b MC |
1794 | struct ext4_xattr_block_find { |
1795 | struct ext4_xattr_search s; | |
ac27a0ec DK |
1796 | struct buffer_head *bh; |
1797 | }; | |
1798 | ||
1799 | static int | |
617ba13b MC |
1800 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
1801 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1802 | { |
1803 | struct super_block *sb = inode->i_sb; | |
1804 | int error; | |
1805 | ||
1806 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
1807 | i->name_index, i->name, i->value, (long)i->value_len); | |
1808 | ||
617ba13b | 1809 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 1810 | /* The inode already has an extended attribute block. */ |
fb265c9c | 1811 | bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
8418897f JX |
1812 | if (IS_ERR(bs->bh)) { |
1813 | error = PTR_ERR(bs->bh); | |
1814 | bs->bh = NULL; | |
1815 | return error; | |
1816 | } | |
ac27a0ec DK |
1817 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", |
1818 | atomic_read(&(bs->bh->b_count)), | |
1819 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
de05ca85 TT |
1820 | error = ext4_xattr_check_block(inode, bs->bh); |
1821 | if (error) | |
fb265c9c | 1822 | return error; |
ac27a0ec DK |
1823 | /* Find the named attribute. */ |
1824 | bs->s.base = BHDR(bs->bh); | |
1825 | bs->s.first = BFIRST(bs->bh); | |
1826 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
1827 | bs->s.here = bs->s.first; | |
9496005d TT |
1828 | error = xattr_find_entry(inode, &bs->s.here, bs->s.end, |
1829 | i->name_index, i->name, 1); | |
ac27a0ec | 1830 | if (error && error != -ENODATA) |
fb265c9c | 1831 | return error; |
ac27a0ec DK |
1832 | bs->s.not_found = error; |
1833 | } | |
fb265c9c | 1834 | return 0; |
ac27a0ec DK |
1835 | } |
1836 | ||
1837 | static int | |
617ba13b MC |
1838 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
1839 | struct ext4_xattr_info *i, | |
1840 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1841 | { |
1842 | struct super_block *sb = inode->i_sb; | |
1843 | struct buffer_head *new_bh = NULL; | |
b347e2bc TE |
1844 | struct ext4_xattr_search s_copy = bs->s; |
1845 | struct ext4_xattr_search *s = &s_copy; | |
7a2508e1 | 1846 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 1847 | int error = 0; |
47387409 | 1848 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
a6d05676 TE |
1849 | struct inode *ea_inode = NULL, *tmp_inode; |
1850 | size_t old_ea_inode_quota = 0; | |
1851 | unsigned int ea_ino; | |
1852 | ||
ac27a0ec | 1853 | |
617ba13b | 1854 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec | 1855 | |
ac27a0ec | 1856 | if (s->base) { |
5d601255 | 1857 | BUFFER_TRACE(bs->bh, "get_write_access"); |
8a2bfdcb MC |
1858 | error = ext4_journal_get_write_access(handle, bs->bh); |
1859 | if (error) | |
1860 | goto cleanup; | |
1861 | lock_buffer(bs->bh); | |
1862 | ||
ac27a0ec | 1863 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
1864 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
1865 | ||
1866 | /* | |
1867 | * This must happen under buffer lock for | |
1868 | * ext4_xattr_block_set() to reliably detect modified | |
1869 | * block | |
1870 | */ | |
cdb7ee4c TE |
1871 | if (ea_block_cache) |
1872 | mb_cache_entry_delete(ea_block_cache, hash, | |
1873 | bs->bh->b_blocknr); | |
ac27a0ec | 1874 | ea_bdebug(bs->bh, "modifying in-place"); |
daf83281 TE |
1875 | error = ext4_xattr_set_entry(i, s, handle, inode, |
1876 | true /* is_block */); | |
dac7a4b4 | 1877 | ext4_xattr_block_csum_set(inode, bs->bh); |
ac27a0ec | 1878 | unlock_buffer(bs->bh); |
6a797d27 | 1879 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1880 | goto bad_block; |
1881 | if (!error) | |
dac7a4b4 TT |
1882 | error = ext4_handle_dirty_metadata(handle, |
1883 | inode, | |
1884 | bs->bh); | |
ac27a0ec DK |
1885 | if (error) |
1886 | goto cleanup; | |
1887 | goto inserted; | |
1888 | } else { | |
1889 | int offset = (char *)s->here - bs->bh->b_data; | |
1890 | ||
8a2bfdcb | 1891 | unlock_buffer(bs->bh); |
ac27a0ec | 1892 | ea_bdebug(bs->bh, "cloning"); |
216553c4 | 1893 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
ac27a0ec DK |
1894 | error = -ENOMEM; |
1895 | if (s->base == NULL) | |
1896 | goto cleanup; | |
1897 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); | |
1898 | s->first = ENTRY(header(s->base)+1); | |
1899 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1900 | s->here = ENTRY(s->base + offset); | |
1901 | s->end = s->base + bs->bh->b_size; | |
dec214d0 TE |
1902 | |
1903 | /* | |
1904 | * If existing entry points to an xattr inode, we need | |
1905 | * to prevent ext4_xattr_set_entry() from decrementing | |
1906 | * ref count on it because the reference belongs to the | |
1907 | * original block. In this case, make the entry look | |
1908 | * like it has an empty value. | |
1909 | */ | |
1910 | if (!s->not_found && s->here->e_value_inum) { | |
a6d05676 TE |
1911 | ea_ino = le32_to_cpu(s->here->e_value_inum); |
1912 | error = ext4_xattr_inode_iget(inode, ea_ino, | |
1913 | le32_to_cpu(s->here->e_hash), | |
1914 | &tmp_inode); | |
1915 | if (error) | |
1916 | goto cleanup; | |
1917 | ||
1918 | if (!ext4_test_inode_state(tmp_inode, | |
1919 | EXT4_STATE_LUSTRE_EA_INODE)) { | |
1920 | /* | |
1921 | * Defer quota free call for previous | |
1922 | * inode until success is guaranteed. | |
1923 | */ | |
1924 | old_ea_inode_quota = le32_to_cpu( | |
dec214d0 | 1925 | s->here->e_value_size); |
a6d05676 TE |
1926 | } |
1927 | iput(tmp_inode); | |
1928 | ||
dec214d0 TE |
1929 | s->here->e_value_inum = 0; |
1930 | s->here->e_value_size = 0; | |
1931 | } | |
ac27a0ec DK |
1932 | } |
1933 | } else { | |
1934 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 1935 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
1936 | error = -ENOMEM; |
1937 | if (s->base == NULL) | |
1938 | goto cleanup; | |
617ba13b | 1939 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
1940 | header(s->base)->h_blocks = cpu_to_le32(1); |
1941 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1942 | s->first = ENTRY(header(s->base)+1); | |
1943 | s->here = ENTRY(header(s->base)+1); | |
1944 | s->end = s->base + sb->s_blocksize; | |
1945 | } | |
1946 | ||
daf83281 | 1947 | error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); |
6a797d27 | 1948 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1949 | goto bad_block; |
1950 | if (error) | |
1951 | goto cleanup; | |
dec214d0 TE |
1952 | |
1953 | if (i->value && s->here->e_value_inum) { | |
dec214d0 TE |
1954 | /* |
1955 | * A ref count on ea_inode has been taken as part of the call to | |
1956 | * ext4_xattr_set_entry() above. We would like to drop this | |
1957 | * extra ref but we have to wait until the xattr block is | |
1958 | * initialized and has its own ref count on the ea_inode. | |
1959 | */ | |
1960 | ea_ino = le32_to_cpu(s->here->e_value_inum); | |
a6d05676 TE |
1961 | error = ext4_xattr_inode_iget(inode, ea_ino, |
1962 | le32_to_cpu(s->here->e_hash), | |
1963 | &ea_inode); | |
dec214d0 TE |
1964 | if (error) { |
1965 | ea_inode = NULL; | |
1966 | goto cleanup; | |
1967 | } | |
1968 | } | |
1969 | ||
ac27a0ec DK |
1970 | inserted: |
1971 | if (!IS_LAST_ENTRY(s->first)) { | |
47387409 TE |
1972 | new_bh = ext4_xattr_block_cache_find(inode, header(s->base), |
1973 | &ce); | |
ac27a0ec DK |
1974 | if (new_bh) { |
1975 | /* We found an identical block in the cache. */ | |
1976 | if (new_bh == bs->bh) | |
1977 | ea_bdebug(new_bh, "keeping"); | |
1978 | else { | |
6048c64b AG |
1979 | u32 ref; |
1980 | ||
b8cb5a54 TE |
1981 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
1982 | ||
ac27a0ec DK |
1983 | /* The old block is released after updating |
1984 | the inode. */ | |
1231b3a1 LC |
1985 | error = dquot_alloc_block(inode, |
1986 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 1987 | if (error) |
ac27a0ec | 1988 | goto cleanup; |
5d601255 | 1989 | BUFFER_TRACE(new_bh, "get_write_access"); |
617ba13b | 1990 | error = ext4_journal_get_write_access(handle, |
ac27a0ec DK |
1991 | new_bh); |
1992 | if (error) | |
1993 | goto cleanup_dquot; | |
1994 | lock_buffer(new_bh); | |
82939d79 JK |
1995 | /* |
1996 | * We have to be careful about races with | |
6048c64b AG |
1997 | * freeing, rehashing or adding references to |
1998 | * xattr block. Once we hold buffer lock xattr | |
1999 | * block's state is stable so we can check | |
2000 | * whether the block got freed / rehashed or | |
2001 | * not. Since we unhash mbcache entry under | |
2002 | * buffer lock when freeing / rehashing xattr | |
2003 | * block, checking whether entry is still | |
2004 | * hashed is reliable. Same rules hold for | |
2005 | * e_reusable handling. | |
82939d79 | 2006 | */ |
6048c64b AG |
2007 | if (hlist_bl_unhashed(&ce->e_hash_list) || |
2008 | !ce->e_reusable) { | |
82939d79 JK |
2009 | /* |
2010 | * Undo everything and check mbcache | |
2011 | * again. | |
2012 | */ | |
2013 | unlock_buffer(new_bh); | |
2014 | dquot_free_block(inode, | |
2015 | EXT4_C2B(EXT4_SB(sb), | |
2016 | 1)); | |
2017 | brelse(new_bh); | |
47387409 | 2018 | mb_cache_entry_put(ea_block_cache, ce); |
82939d79 JK |
2019 | ce = NULL; |
2020 | new_bh = NULL; | |
2021 | goto inserted; | |
2022 | } | |
6048c64b AG |
2023 | ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
2024 | BHDR(new_bh)->h_refcount = cpu_to_le32(ref); | |
2025 | if (ref >= EXT4_XATTR_REFCOUNT_MAX) | |
2026 | ce->e_reusable = 0; | |
ac27a0ec | 2027 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
6048c64b | 2028 | ref); |
dac7a4b4 | 2029 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec | 2030 | unlock_buffer(new_bh); |
dac7a4b4 TT |
2031 | error = ext4_handle_dirty_metadata(handle, |
2032 | inode, | |
2033 | new_bh); | |
ac27a0ec DK |
2034 | if (error) |
2035 | goto cleanup_dquot; | |
2036 | } | |
47387409 TE |
2037 | mb_cache_entry_touch(ea_block_cache, ce); |
2038 | mb_cache_entry_put(ea_block_cache, ce); | |
ac27a0ec DK |
2039 | ce = NULL; |
2040 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
2041 | /* We were modifying this block in-place. */ | |
2042 | ea_bdebug(bs->bh, "keeping this block"); | |
ec000220 | 2043 | ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); |
ac27a0ec DK |
2044 | new_bh = bs->bh; |
2045 | get_bh(new_bh); | |
2046 | } else { | |
2047 | /* We need to allocate a new block */ | |
fb0a387d ES |
2048 | ext4_fsblk_t goal, block; |
2049 | ||
b8cb5a54 TE |
2050 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
2051 | ||
fb0a387d | 2052 | goal = ext4_group_first_block_no(sb, |
d00a6d7b | 2053 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
2054 | |
2055 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 2056 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2057 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
2058 | ||
55f020db AH |
2059 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
2060 | NULL, &error); | |
ac27a0ec DK |
2061 | if (error) |
2062 | goto cleanup; | |
fb0a387d | 2063 | |
12e9b892 | 2064 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2065 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
2066 | ||
ace36ad4 JP |
2067 | ea_idebug(inode, "creating block %llu", |
2068 | (unsigned long long)block); | |
ac27a0ec DK |
2069 | |
2070 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 2071 | if (unlikely(!new_bh)) { |
860d21e2 | 2072 | error = -ENOMEM; |
ac27a0ec | 2073 | getblk_failed: |
7dc57615 | 2074 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 2075 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
2076 | goto cleanup; |
2077 | } | |
dec214d0 TE |
2078 | error = ext4_xattr_inode_inc_ref_all(handle, inode, |
2079 | ENTRY(header(s->base)+1)); | |
2080 | if (error) | |
2081 | goto getblk_failed; | |
2082 | if (ea_inode) { | |
2083 | /* Drop the extra ref on ea_inode. */ | |
2084 | error = ext4_xattr_inode_dec_ref(handle, | |
2085 | ea_inode); | |
2086 | if (error) | |
2087 | ext4_warning_inode(ea_inode, | |
2088 | "dec ref error=%d", | |
2089 | error); | |
2090 | iput(ea_inode); | |
2091 | ea_inode = NULL; | |
2092 | } | |
2093 | ||
ac27a0ec | 2094 | lock_buffer(new_bh); |
617ba13b | 2095 | error = ext4_journal_get_create_access(handle, new_bh); |
ac27a0ec DK |
2096 | if (error) { |
2097 | unlock_buffer(new_bh); | |
860d21e2 | 2098 | error = -EIO; |
ac27a0ec DK |
2099 | goto getblk_failed; |
2100 | } | |
2101 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
dac7a4b4 | 2102 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec DK |
2103 | set_buffer_uptodate(new_bh); |
2104 | unlock_buffer(new_bh); | |
47387409 | 2105 | ext4_xattr_block_cache_insert(ea_block_cache, new_bh); |
dac7a4b4 TT |
2106 | error = ext4_handle_dirty_metadata(handle, inode, |
2107 | new_bh); | |
ac27a0ec DK |
2108 | if (error) |
2109 | goto cleanup; | |
2110 | } | |
2111 | } | |
2112 | ||
a6d05676 TE |
2113 | if (old_ea_inode_quota) |
2114 | ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); | |
dec214d0 | 2115 | |
ac27a0ec | 2116 | /* Update the inode. */ |
617ba13b | 2117 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
2118 | |
2119 | /* Drop the previous xattr block. */ | |
dec214d0 TE |
2120 | if (bs->bh && bs->bh != new_bh) { |
2121 | struct ext4_xattr_inode_array *ea_inode_array = NULL; | |
2122 | ||
2123 | ext4_xattr_release_block(handle, inode, bs->bh, | |
2124 | &ea_inode_array, | |
2125 | 0 /* extra_credits */); | |
2126 | ext4_xattr_inode_array_free(ea_inode_array); | |
2127 | } | |
ac27a0ec DK |
2128 | error = 0; |
2129 | ||
2130 | cleanup: | |
dec214d0 TE |
2131 | if (ea_inode) { |
2132 | int error2; | |
2133 | ||
2134 | error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
2135 | if (error2) | |
2136 | ext4_warning_inode(ea_inode, "dec ref error=%d", | |
2137 | error2); | |
2138 | ||
2139 | /* If there was an error, revert the quota charge. */ | |
2140 | if (error) | |
a6d05676 | 2141 | ext4_xattr_inode_free_quota(inode, ea_inode, |
dec214d0 TE |
2142 | i_size_read(ea_inode)); |
2143 | iput(ea_inode); | |
2144 | } | |
ac27a0ec | 2145 | if (ce) |
47387409 | 2146 | mb_cache_entry_put(ea_block_cache, ce); |
ac27a0ec DK |
2147 | brelse(new_bh); |
2148 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
2149 | kfree(s->base); | |
2150 | ||
2151 | return error; | |
2152 | ||
2153 | cleanup_dquot: | |
1231b3a1 | 2154 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
2155 | goto cleanup; |
2156 | ||
2157 | bad_block: | |
24676da4 TT |
2158 | EXT4_ERROR_INODE(inode, "bad block %llu", |
2159 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
2160 | goto cleanup; |
2161 | ||
2162 | #undef header | |
2163 | } | |
2164 | ||
879b3825 TM |
2165 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
2166 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2167 | { |
617ba13b MC |
2168 | struct ext4_xattr_ibody_header *header; |
2169 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
2170 | int error; |
2171 | ||
617ba13b | 2172 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 2173 | return 0; |
617ba13b | 2174 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
2175 | header = IHDR(inode, raw_inode); |
2176 | is->s.base = is->s.first = IFIRST(header); | |
2177 | is->s.here = is->s.first; | |
617ba13b | 2178 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 2179 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
9e92f48c | 2180 | error = xattr_check_inode(inode, header, is->s.end); |
ac27a0ec DK |
2181 | if (error) |
2182 | return error; | |
2183 | /* Find the named attribute. */ | |
9496005d TT |
2184 | error = xattr_find_entry(inode, &is->s.here, is->s.end, |
2185 | i->name_index, i->name, 0); | |
ac27a0ec DK |
2186 | if (error && error != -ENODATA) |
2187 | return error; | |
2188 | is->s.not_found = error; | |
2189 | } | |
2190 | return 0; | |
2191 | } | |
2192 | ||
310c097c | 2193 | int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, |
0d812f77 TM |
2194 | struct ext4_xattr_info *i, |
2195 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2196 | { |
617ba13b MC |
2197 | struct ext4_xattr_ibody_header *header; |
2198 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
2199 | int error; |
2200 | ||
617ba13b | 2201 | if (EXT4_I(inode)->i_extra_isize == 0) |
ac27a0ec | 2202 | return -ENOSPC; |
daf83281 | 2203 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
ac27a0ec DK |
2204 | if (error) |
2205 | return error; | |
617ba13b | 2206 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 2207 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 2208 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 2209 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2210 | } else { |
2211 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 2212 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2213 | } |
2214 | return 0; | |
2215 | } | |
2216 | ||
3fd16462 JK |
2217 | static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
2218 | struct ext4_xattr_info *i) | |
2219 | { | |
2220 | void *value; | |
2221 | ||
0bd454c0 TE |
2222 | /* When e_value_inum is set the value is stored externally. */ |
2223 | if (s->here->e_value_inum) | |
2224 | return 0; | |
3fd16462 JK |
2225 | if (le32_to_cpu(s->here->e_value_size) != i->value_len) |
2226 | return 0; | |
2227 | value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); | |
2228 | return !memcmp(value, i->value, i->value_len); | |
2229 | } | |
2230 | ||
dec214d0 TE |
2231 | static struct buffer_head *ext4_xattr_get_block(struct inode *inode) |
2232 | { | |
2233 | struct buffer_head *bh; | |
2234 | int error; | |
2235 | ||
2236 | if (!EXT4_I(inode)->i_file_acl) | |
2237 | return NULL; | |
fb265c9c TT |
2238 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2239 | if (IS_ERR(bh)) | |
2240 | return bh; | |
dec214d0 | 2241 | error = ext4_xattr_check_block(inode, bh); |
ecaaf408 VA |
2242 | if (error) { |
2243 | brelse(bh); | |
dec214d0 | 2244 | return ERR_PTR(error); |
ecaaf408 | 2245 | } |
dec214d0 TE |
2246 | return bh; |
2247 | } | |
2248 | ||
ac27a0ec | 2249 | /* |
617ba13b | 2250 | * ext4_xattr_set_handle() |
ac27a0ec | 2251 | * |
6e9510b0 | 2252 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
2253 | * is NULL to remove an existing extended attribute, and non-NULL to |
2254 | * either replace an existing extended attribute, or create a new extended | |
2255 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
2256 | * specify that an extended attribute must exist and must not exist | |
2257 | * previous to the call, respectively. | |
2258 | * | |
2259 | * Returns 0, or a negative error number on failure. | |
2260 | */ | |
2261 | int | |
617ba13b | 2262 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
2263 | const char *name, const void *value, size_t value_len, |
2264 | int flags) | |
2265 | { | |
617ba13b | 2266 | struct ext4_xattr_info i = { |
ac27a0ec DK |
2267 | .name_index = name_index, |
2268 | .name = name, | |
2269 | .value = value, | |
2270 | .value_len = value_len, | |
e50e5129 | 2271 | .in_inode = 0, |
ac27a0ec | 2272 | }; |
617ba13b | 2273 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
2274 | .s = { .not_found = -ENODATA, }, |
2275 | }; | |
617ba13b | 2276 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
2277 | .s = { .not_found = -ENODATA, }, |
2278 | }; | |
c755e251 | 2279 | int no_expand; |
ac27a0ec DK |
2280 | int error; |
2281 | ||
2282 | if (!name) | |
2283 | return -EINVAL; | |
2284 | if (strlen(name) > 255) | |
2285 | return -ERANGE; | |
b8cb5a54 | 2286 | |
c755e251 | 2287 | ext4_write_lock_xattr(inode, &no_expand); |
4d20c685 | 2288 | |
c1a5d5f6 TE |
2289 | /* Check journal credits under write lock. */ |
2290 | if (ext4_handle_valid(handle)) { | |
dec214d0 | 2291 | struct buffer_head *bh; |
c1a5d5f6 TE |
2292 | int credits; |
2293 | ||
dec214d0 TE |
2294 | bh = ext4_xattr_get_block(inode); |
2295 | if (IS_ERR(bh)) { | |
2296 | error = PTR_ERR(bh); | |
2297 | goto cleanup; | |
2298 | } | |
2299 | ||
af65207c TE |
2300 | credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2301 | value_len, | |
2302 | flags & XATTR_CREATE); | |
dec214d0 TE |
2303 | brelse(bh); |
2304 | ||
a9a8344e | 2305 | if (jbd2_handle_buffer_credits(handle) < credits) { |
c1a5d5f6 TE |
2306 | error = -ENOSPC; |
2307 | goto cleanup; | |
2308 | } | |
163f0ec1 | 2309 | WARN_ON_ONCE(!(current->flags & PF_MEMALLOC_NOFS)); |
c1a5d5f6 TE |
2310 | } |
2311 | ||
66543617 | 2312 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
2313 | if (error) |
2314 | goto cleanup; | |
2315 | ||
19f5fb7a | 2316 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
2317 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
2318 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 2319 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
2320 | } |
2321 | ||
617ba13b | 2322 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
2323 | if (error) |
2324 | goto cleanup; | |
2325 | if (is.s.not_found) | |
617ba13b | 2326 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
2327 | if (error) |
2328 | goto cleanup; | |
2329 | if (is.s.not_found && bs.s.not_found) { | |
2330 | error = -ENODATA; | |
2331 | if (flags & XATTR_REPLACE) | |
2332 | goto cleanup; | |
2333 | error = 0; | |
2334 | if (!value) | |
2335 | goto cleanup; | |
2336 | } else { | |
2337 | error = -EEXIST; | |
2338 | if (flags & XATTR_CREATE) | |
2339 | goto cleanup; | |
2340 | } | |
dec214d0 | 2341 | |
ac27a0ec DK |
2342 | if (!value) { |
2343 | if (!is.s.not_found) | |
e50e5129 | 2344 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 2345 | else if (!bs.s.not_found) |
617ba13b | 2346 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2347 | } else { |
3fd16462 JK |
2348 | error = 0; |
2349 | /* Xattr value did not change? Save us some work and bail out */ | |
2350 | if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) | |
2351 | goto cleanup; | |
2352 | if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) | |
2353 | goto cleanup; | |
2354 | ||
b347e2bc TE |
2355 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2356 | (EXT4_XATTR_SIZE(i.value_len) > | |
2357 | EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) | |
2358 | i.in_inode = 1; | |
2359 | retry_inode: | |
e50e5129 | 2360 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
2361 | if (!error && !bs.s.not_found) { |
2362 | i.value = NULL; | |
617ba13b | 2363 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2364 | } else if (error == -ENOSPC) { |
7e01c8e5 | 2365 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
45ae932d VA |
2366 | brelse(bs.bh); |
2367 | bs.bh = NULL; | |
7e01c8e5 TY |
2368 | error = ext4_xattr_block_find(inode, &i, &bs); |
2369 | if (error) | |
2370 | goto cleanup; | |
2371 | } | |
617ba13b | 2372 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
b347e2bc | 2373 | if (!error && !is.s.not_found) { |
ac27a0ec | 2374 | i.value = NULL; |
e50e5129 AD |
2375 | error = ext4_xattr_ibody_set(handle, inode, &i, |
2376 | &is); | |
b347e2bc TE |
2377 | } else if (error == -ENOSPC) { |
2378 | /* | |
2379 | * Xattr does not fit in the block, store at | |
2380 | * external inode if possible. | |
2381 | */ | |
2382 | if (ext4_has_feature_ea_inode(inode->i_sb) && | |
6b224899 | 2383 | i.value_len && !i.in_inode) { |
b347e2bc TE |
2384 | i.in_inode = 1; |
2385 | goto retry_inode; | |
2386 | } | |
ac27a0ec DK |
2387 | } |
2388 | } | |
2389 | } | |
2390 | if (!error) { | |
617ba13b | 2391 | ext4_xattr_update_super_block(handle, inode->i_sb); |
eeca7ea1 | 2392 | inode->i_ctime = current_time(inode); |
6dd4ee7c | 2393 | if (!value) |
c755e251 | 2394 | no_expand = 0; |
617ba13b | 2395 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 2396 | /* |
617ba13b | 2397 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
2398 | * error != 0. |
2399 | */ | |
2400 | is.iloc.bh = NULL; | |
2401 | if (IS_SYNC(inode)) | |
0390131b | 2402 | ext4_handle_sync(handle); |
ac27a0ec | 2403 | } |
aa75f4d3 | 2404 | ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR); |
ac27a0ec DK |
2405 | |
2406 | cleanup: | |
2407 | brelse(is.iloc.bh); | |
2408 | brelse(bs.bh); | |
c755e251 | 2409 | ext4_write_unlock_xattr(inode, &no_expand); |
ac27a0ec DK |
2410 | return error; |
2411 | } | |
2412 | ||
af65207c TE |
2413 | int ext4_xattr_set_credits(struct inode *inode, size_t value_len, |
2414 | bool is_create, int *credits) | |
c1a5d5f6 | 2415 | { |
dec214d0 TE |
2416 | struct buffer_head *bh; |
2417 | int err; | |
c1a5d5f6 | 2418 | |
dec214d0 | 2419 | *credits = 0; |
c1a5d5f6 | 2420 | |
dec214d0 TE |
2421 | if (!EXT4_SB(inode->i_sb)->s_journal) |
2422 | return 0; | |
c1a5d5f6 | 2423 | |
dec214d0 | 2424 | down_read(&EXT4_I(inode)->xattr_sem); |
c1a5d5f6 | 2425 | |
dec214d0 TE |
2426 | bh = ext4_xattr_get_block(inode); |
2427 | if (IS_ERR(bh)) { | |
2428 | err = PTR_ERR(bh); | |
2429 | } else { | |
af65207c TE |
2430 | *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2431 | value_len, is_create); | |
dec214d0 TE |
2432 | brelse(bh); |
2433 | err = 0; | |
c1a5d5f6 | 2434 | } |
dec214d0 TE |
2435 | |
2436 | up_read(&EXT4_I(inode)->xattr_sem); | |
2437 | return err; | |
c1a5d5f6 TE |
2438 | } |
2439 | ||
ac27a0ec | 2440 | /* |
617ba13b | 2441 | * ext4_xattr_set() |
ac27a0ec | 2442 | * |
617ba13b | 2443 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
2444 | * attribute modification is a filesystem transaction by itself. |
2445 | * | |
2446 | * Returns 0, or a negative error number on failure. | |
2447 | */ | |
2448 | int | |
617ba13b | 2449 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
2450 | const void *value, size_t value_len, int flags) |
2451 | { | |
2452 | handle_t *handle; | |
e50e5129 | 2453 | struct super_block *sb = inode->i_sb; |
ac27a0ec | 2454 | int error, retries = 0; |
c1a5d5f6 | 2455 | int credits; |
ac27a0ec | 2456 | |
b8cb5a54 TE |
2457 | error = dquot_initialize(inode); |
2458 | if (error) | |
2459 | return error; | |
e50e5129 | 2460 | |
ac27a0ec | 2461 | retry: |
af65207c TE |
2462 | error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, |
2463 | &credits); | |
dec214d0 TE |
2464 | if (error) |
2465 | return error; | |
2466 | ||
9924a92a | 2467 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
2468 | if (IS_ERR(handle)) { |
2469 | error = PTR_ERR(handle); | |
2470 | } else { | |
2471 | int error2; | |
2472 | ||
617ba13b | 2473 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 2474 | value, value_len, flags); |
617ba13b | 2475 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 2476 | if (error == -ENOSPC && |
e50e5129 | 2477 | ext4_should_retry_alloc(sb, &retries)) |
ac27a0ec DK |
2478 | goto retry; |
2479 | if (error == 0) | |
2480 | error = error2; | |
2481 | } | |
aa75f4d3 | 2482 | ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR); |
ac27a0ec DK |
2483 | |
2484 | return error; | |
2485 | } | |
2486 | ||
6dd4ee7c KS |
2487 | /* |
2488 | * Shift the EA entries in the inode to create space for the increased | |
2489 | * i_extra_isize. | |
2490 | */ | |
2491 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
2492 | int value_offs_shift, void *to, | |
94405713 | 2493 | void *from, size_t n) |
6dd4ee7c KS |
2494 | { |
2495 | struct ext4_xattr_entry *last = entry; | |
2496 | int new_offs; | |
2497 | ||
94405713 JK |
2498 | /* We always shift xattr headers further thus offsets get lower */ |
2499 | BUG_ON(value_offs_shift > 0); | |
2500 | ||
6dd4ee7c KS |
2501 | /* Adjust the value offsets of the entries */ |
2502 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 2503 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
2504 | new_offs = le16_to_cpu(last->e_value_offs) + |
2505 | value_offs_shift; | |
6dd4ee7c KS |
2506 | last->e_value_offs = cpu_to_le16(new_offs); |
2507 | } | |
2508 | } | |
2509 | /* Shift the entries by n bytes */ | |
2510 | memmove(to, from, n); | |
2511 | } | |
2512 | ||
3f2571c1 JK |
2513 | /* |
2514 | * Move xattr pointed to by 'entry' from inode into external xattr block | |
2515 | */ | |
2516 | static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, | |
2517 | struct ext4_inode *raw_inode, | |
2518 | struct ext4_xattr_entry *entry) | |
2519 | { | |
2520 | struct ext4_xattr_ibody_find *is = NULL; | |
2521 | struct ext4_xattr_block_find *bs = NULL; | |
2522 | char *buffer = NULL, *b_entry_name = NULL; | |
f6109100 | 2523 | size_t value_size = le32_to_cpu(entry->e_value_size); |
3f2571c1 JK |
2524 | struct ext4_xattr_info i = { |
2525 | .value = NULL, | |
2526 | .value_len = 0, | |
2527 | .name_index = entry->e_name_index, | |
f6109100 | 2528 | .in_inode = !!entry->e_value_inum, |
3f2571c1 JK |
2529 | }; |
2530 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2531 | int error; | |
2532 | ||
3f2571c1 JK |
2533 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); |
2534 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
2535 | buffer = kmalloc(value_size, GFP_NOFS); | |
2536 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
2537 | if (!is || !bs || !buffer || !b_entry_name) { | |
2538 | error = -ENOMEM; | |
2539 | goto out; | |
2540 | } | |
2541 | ||
2542 | is->s.not_found = -ENODATA; | |
2543 | bs->s.not_found = -ENODATA; | |
2544 | is->iloc.bh = NULL; | |
2545 | bs->bh = NULL; | |
2546 | ||
2547 | /* Save the entry name and the entry value */ | |
f6109100 | 2548 | if (entry->e_value_inum) { |
b9fc761e | 2549 | error = ext4_xattr_inode_get(inode, entry, buffer, value_size); |
f6109100 TE |
2550 | if (error) |
2551 | goto out; | |
2552 | } else { | |
2553 | size_t value_offs = le16_to_cpu(entry->e_value_offs); | |
2554 | memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); | |
2555 | } | |
2556 | ||
3f2571c1 JK |
2557 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); |
2558 | b_entry_name[entry->e_name_len] = '\0'; | |
2559 | i.name = b_entry_name; | |
2560 | ||
2561 | error = ext4_get_inode_loc(inode, &is->iloc); | |
2562 | if (error) | |
2563 | goto out; | |
2564 | ||
2565 | error = ext4_xattr_ibody_find(inode, &i, is); | |
2566 | if (error) | |
2567 | goto out; | |
2568 | ||
2569 | /* Remove the chosen entry from the inode */ | |
e50e5129 | 2570 | error = ext4_xattr_ibody_set(handle, inode, &i, is); |
3f2571c1 JK |
2571 | if (error) |
2572 | goto out; | |
2573 | ||
3f2571c1 JK |
2574 | i.value = buffer; |
2575 | i.value_len = value_size; | |
2576 | error = ext4_xattr_block_find(inode, &i, bs); | |
2577 | if (error) | |
2578 | goto out; | |
2579 | ||
2580 | /* Add entry which was removed from the inode into the block */ | |
2581 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
2582 | if (error) | |
2583 | goto out; | |
2584 | error = 0; | |
2585 | out: | |
2586 | kfree(b_entry_name); | |
2587 | kfree(buffer); | |
2588 | if (is) | |
2589 | brelse(is->iloc.bh); | |
6bdc9977 VA |
2590 | if (bs) |
2591 | brelse(bs->bh); | |
3f2571c1 JK |
2592 | kfree(is); |
2593 | kfree(bs); | |
2594 | ||
2595 | return error; | |
2596 | } | |
2597 | ||
dfa2064b JK |
2598 | static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, |
2599 | struct ext4_inode *raw_inode, | |
2600 | int isize_diff, size_t ifree, | |
2601 | size_t bfree, int *total_ino) | |
2602 | { | |
2603 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2604 | struct ext4_xattr_entry *small_entry; | |
2605 | struct ext4_xattr_entry *entry; | |
2606 | struct ext4_xattr_entry *last; | |
2607 | unsigned int entry_size; /* EA entry size */ | |
2608 | unsigned int total_size; /* EA entry size + value size */ | |
2609 | unsigned int min_total_size; | |
2610 | int error; | |
2611 | ||
2612 | while (isize_diff > ifree) { | |
2613 | entry = NULL; | |
2614 | small_entry = NULL; | |
2615 | min_total_size = ~0U; | |
2616 | last = IFIRST(header); | |
2617 | /* Find the entry best suited to be pushed into EA block */ | |
2618 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
8cdb5240 TT |
2619 | /* never move system.data out of the inode */ |
2620 | if ((last->e_name_len == 4) && | |
2621 | (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) && | |
2622 | !memcmp(last->e_name, "data", 4)) | |
2623 | continue; | |
9bb21ced TE |
2624 | total_size = EXT4_XATTR_LEN(last->e_name_len); |
2625 | if (!last->e_value_inum) | |
2626 | total_size += EXT4_XATTR_SIZE( | |
2627 | le32_to_cpu(last->e_value_size)); | |
dfa2064b JK |
2628 | if (total_size <= bfree && |
2629 | total_size < min_total_size) { | |
2630 | if (total_size + ifree < isize_diff) { | |
2631 | small_entry = last; | |
2632 | } else { | |
2633 | entry = last; | |
2634 | min_total_size = total_size; | |
2635 | } | |
2636 | } | |
2637 | } | |
2638 | ||
2639 | if (entry == NULL) { | |
2640 | if (small_entry == NULL) | |
2641 | return -ENOSPC; | |
2642 | entry = small_entry; | |
2643 | } | |
2644 | ||
2645 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
9bb21ced TE |
2646 | total_size = entry_size; |
2647 | if (!entry->e_value_inum) | |
2648 | total_size += EXT4_XATTR_SIZE( | |
2649 | le32_to_cpu(entry->e_value_size)); | |
dfa2064b JK |
2650 | error = ext4_xattr_move_to_block(handle, inode, raw_inode, |
2651 | entry); | |
2652 | if (error) | |
2653 | return error; | |
2654 | ||
2655 | *total_ino -= entry_size; | |
2656 | ifree += total_size; | |
2657 | bfree -= total_size; | |
2658 | } | |
2659 | ||
2660 | return 0; | |
2661 | } | |
2662 | ||
6dd4ee7c KS |
2663 | /* |
2664 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
2665 | * Returns 0 on success or negative error number on failure. | |
2666 | */ | |
2667 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
2668 | struct ext4_inode *raw_inode, handle_t *handle) | |
2669 | { | |
2670 | struct ext4_xattr_ibody_header *header; | |
cf0a5e81 MX |
2671 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
2672 | static unsigned int mnt_count; | |
e3014d14 JK |
2673 | size_t min_offs; |
2674 | size_t ifree, bfree; | |
7b1b2c1b | 2675 | int total_ino; |
6e0cd088 | 2676 | void *base, *end; |
d0141191 | 2677 | int error = 0, tried_min_extra_isize = 0; |
cf0a5e81 | 2678 | int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); |
d0141191 | 2679 | int isize_diff; /* How much do we need to grow i_extra_isize */ |
6dd4ee7c | 2680 | |
6dd4ee7c | 2681 | retry: |
d0141191 | 2682 | isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; |
2e81a4ee | 2683 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) |
b640b2c5 | 2684 | return 0; |
6dd4ee7c KS |
2685 | |
2686 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
2687 | |
2688 | /* | |
2689 | * Check if enough free space is available in the inode to shift the | |
2690 | * entries ahead by new_extra_isize. | |
2691 | */ | |
2692 | ||
6e0cd088 | 2693 | base = IFIRST(header); |
6dd4ee7c KS |
2694 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
2695 | min_offs = end - base; | |
a805622a | 2696 | total_ino = sizeof(struct ext4_xattr_ibody_header) + sizeof(u32); |
6dd4ee7c | 2697 | |
9e92f48c TT |
2698 | error = xattr_check_inode(inode, header, end); |
2699 | if (error) | |
2700 | goto cleanup; | |
2701 | ||
6e0cd088 | 2702 | ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); |
e3014d14 JK |
2703 | if (ifree >= isize_diff) |
2704 | goto shift; | |
6dd4ee7c KS |
2705 | |
2706 | /* | |
2707 | * Enough free space isn't available in the inode, check if | |
2708 | * EA block can hold new_extra_isize bytes. | |
2709 | */ | |
2710 | if (EXT4_I(inode)->i_file_acl) { | |
53692ec0 VA |
2711 | struct buffer_head *bh; |
2712 | ||
fb265c9c TT |
2713 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2714 | if (IS_ERR(bh)) { | |
2715 | error = PTR_ERR(bh); | |
6dd4ee7c | 2716 | goto cleanup; |
fb265c9c | 2717 | } |
de05ca85 | 2718 | error = ext4_xattr_check_block(inode, bh); |
53692ec0 VA |
2719 | if (error) { |
2720 | brelse(bh); | |
6dd4ee7c | 2721 | goto cleanup; |
53692ec0 | 2722 | } |
6dd4ee7c | 2723 | base = BHDR(bh); |
6dd4ee7c KS |
2724 | end = bh->b_data + bh->b_size; |
2725 | min_offs = end - base; | |
6e0cd088 JK |
2726 | bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, |
2727 | NULL); | |
b640b2c5 | 2728 | brelse(bh); |
e3014d14 | 2729 | if (bfree + ifree < isize_diff) { |
6dd4ee7c KS |
2730 | if (!tried_min_extra_isize && s_min_extra_isize) { |
2731 | tried_min_extra_isize++; | |
2732 | new_extra_isize = s_min_extra_isize; | |
6dd4ee7c KS |
2733 | goto retry; |
2734 | } | |
dfa2064b | 2735 | error = -ENOSPC; |
6dd4ee7c KS |
2736 | goto cleanup; |
2737 | } | |
2738 | } else { | |
e3014d14 | 2739 | bfree = inode->i_sb->s_blocksize; |
6dd4ee7c KS |
2740 | } |
2741 | ||
dfa2064b JK |
2742 | error = ext4_xattr_make_inode_space(handle, inode, raw_inode, |
2743 | isize_diff, ifree, bfree, | |
2744 | &total_ino); | |
2745 | if (error) { | |
2746 | if (error == -ENOSPC && !tried_min_extra_isize && | |
2747 | s_min_extra_isize) { | |
2748 | tried_min_extra_isize++; | |
2749 | new_extra_isize = s_min_extra_isize; | |
dfa2064b | 2750 | goto retry; |
6dd4ee7c | 2751 | } |
dfa2064b | 2752 | goto cleanup; |
6dd4ee7c | 2753 | } |
e3014d14 JK |
2754 | shift: |
2755 | /* Adjust the offsets and shift the remaining entries ahead */ | |
6e0cd088 | 2756 | ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize |
e3014d14 JK |
2757 | - new_extra_isize, (void *)raw_inode + |
2758 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
94405713 | 2759 | (void *)header, total_ino); |
e3014d14 | 2760 | EXT4_I(inode)->i_extra_isize = new_extra_isize; |
6dd4ee7c KS |
2761 | |
2762 | cleanup: | |
b640b2c5 | 2763 | if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { |
cf0a5e81 MX |
2764 | ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", |
2765 | inode->i_ino); | |
2766 | mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); | |
2767 | } | |
6dd4ee7c KS |
2768 | return error; |
2769 | } | |
2770 | ||
e50e5129 AD |
2771 | #define EIA_INCR 16 /* must be 2^n */ |
2772 | #define EIA_MASK (EIA_INCR - 1) | |
dec214d0 TE |
2773 | |
2774 | /* Add the large xattr @inode into @ea_inode_array for deferred iput(). | |
0421a189 | 2775 | * If @ea_inode_array is new or full it will be grown and the old |
e50e5129 AD |
2776 | * contents copied over. |
2777 | */ | |
2778 | static int | |
0421a189 TE |
2779 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, |
2780 | struct inode *inode) | |
e50e5129 | 2781 | { |
0421a189 | 2782 | if (*ea_inode_array == NULL) { |
e50e5129 AD |
2783 | /* |
2784 | * Start with 15 inodes, so it fits into a power-of-two size. | |
0421a189 | 2785 | * If *ea_inode_array is NULL, this is essentially offsetof() |
e50e5129 | 2786 | */ |
0421a189 TE |
2787 | (*ea_inode_array) = |
2788 | kmalloc(offsetof(struct ext4_xattr_inode_array, | |
2789 | inodes[EIA_MASK]), | |
e50e5129 | 2790 | GFP_NOFS); |
0421a189 | 2791 | if (*ea_inode_array == NULL) |
e50e5129 | 2792 | return -ENOMEM; |
0421a189 TE |
2793 | (*ea_inode_array)->count = 0; |
2794 | } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { | |
e50e5129 | 2795 | /* expand the array once all 15 + n * 16 slots are full */ |
0421a189 TE |
2796 | struct ext4_xattr_inode_array *new_array = NULL; |
2797 | int count = (*ea_inode_array)->count; | |
e50e5129 AD |
2798 | |
2799 | /* if new_array is NULL, this is essentially offsetof() */ | |
2800 | new_array = kmalloc( | |
0421a189 TE |
2801 | offsetof(struct ext4_xattr_inode_array, |
2802 | inodes[count + EIA_INCR]), | |
e50e5129 AD |
2803 | GFP_NOFS); |
2804 | if (new_array == NULL) | |
2805 | return -ENOMEM; | |
0421a189 TE |
2806 | memcpy(new_array, *ea_inode_array, |
2807 | offsetof(struct ext4_xattr_inode_array, inodes[count])); | |
2808 | kfree(*ea_inode_array); | |
2809 | *ea_inode_array = new_array; | |
e50e5129 | 2810 | } |
0421a189 | 2811 | (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; |
e50e5129 AD |
2812 | return 0; |
2813 | } | |
2814 | ||
ac27a0ec | 2815 | /* |
617ba13b | 2816 | * ext4_xattr_delete_inode() |
ac27a0ec | 2817 | * |
e50e5129 | 2818 | * Free extended attribute resources associated with this inode. Traverse |
dec214d0 TE |
2819 | * all entries and decrement reference on any xattr inodes associated with this |
2820 | * inode. This is called immediately before an inode is freed. We have exclusive | |
2821 | * access to the inode. If an orphan inode is deleted it will also release its | |
2822 | * references on xattr block and xattr inodes. | |
ac27a0ec | 2823 | */ |
dec214d0 TE |
2824 | int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, |
2825 | struct ext4_xattr_inode_array **ea_inode_array, | |
2826 | int extra_credits) | |
ac27a0ec DK |
2827 | { |
2828 | struct buffer_head *bh = NULL; | |
e50e5129 | 2829 | struct ext4_xattr_ibody_header *header; |
30a7eb97 | 2830 | struct ext4_iloc iloc = { .bh = NULL }; |
dec214d0 | 2831 | struct ext4_xattr_entry *entry; |
a6d05676 | 2832 | struct inode *ea_inode; |
30a7eb97 TE |
2833 | int error; |
2834 | ||
83448bdf JK |
2835 | error = ext4_journal_ensure_credits(handle, extra_credits, |
2836 | ext4_free_metadata_revoke_credits(inode->i_sb, 1)); | |
a4130367 | 2837 | if (error < 0) { |
30a7eb97 TE |
2838 | EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); |
2839 | goto cleanup; | |
2840 | } | |
ac27a0ec | 2841 | |
dec214d0 TE |
2842 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2843 | ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
e50e5129 | 2844 | |
dec214d0 TE |
2845 | error = ext4_get_inode_loc(inode, &iloc); |
2846 | if (error) { | |
2847 | EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); | |
2848 | goto cleanup; | |
2849 | } | |
30a7eb97 | 2850 | |
dec214d0 TE |
2851 | error = ext4_journal_get_write_access(handle, iloc.bh); |
2852 | if (error) { | |
2853 | EXT4_ERROR_INODE(inode, "write access (error %d)", | |
2854 | error); | |
2855 | goto cleanup; | |
2856 | } | |
e50e5129 | 2857 | |
dec214d0 TE |
2858 | header = IHDR(inode, ext4_raw_inode(&iloc)); |
2859 | if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) | |
2860 | ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, | |
2861 | IFIRST(header), | |
2862 | false /* block_csum */, | |
2863 | ea_inode_array, | |
2864 | extra_credits, | |
2865 | false /* skip_quota */); | |
ac27a0ec | 2866 | } |
e50e5129 | 2867 | |
dec214d0 | 2868 | if (EXT4_I(inode)->i_file_acl) { |
fb265c9c TT |
2869 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2870 | if (IS_ERR(bh)) { | |
2871 | error = PTR_ERR(bh); | |
878520ac | 2872 | if (error == -EIO) { |
54d3adbc TT |
2873 | EXT4_ERROR_INODE_ERR(inode, EIO, |
2874 | "block %llu read error", | |
2875 | EXT4_I(inode)->i_file_acl); | |
878520ac | 2876 | } |
7159a986 | 2877 | bh = NULL; |
dec214d0 TE |
2878 | goto cleanup; |
2879 | } | |
2880 | error = ext4_xattr_check_block(inode, bh); | |
de05ca85 | 2881 | if (error) |
e50e5129 | 2882 | goto cleanup; |
e50e5129 | 2883 | |
dec214d0 TE |
2884 | if (ext4_has_feature_ea_inode(inode->i_sb)) { |
2885 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
a6d05676 TE |
2886 | entry = EXT4_XATTR_NEXT(entry)) { |
2887 | if (!entry->e_value_inum) | |
2888 | continue; | |
2889 | error = ext4_xattr_inode_iget(inode, | |
2890 | le32_to_cpu(entry->e_value_inum), | |
2891 | le32_to_cpu(entry->e_hash), | |
2892 | &ea_inode); | |
2893 | if (error) | |
2894 | continue; | |
2895 | ext4_xattr_inode_free_quota(inode, ea_inode, | |
dec214d0 | 2896 | le32_to_cpu(entry->e_value_size)); |
a6d05676 TE |
2897 | iput(ea_inode); |
2898 | } | |
dec214d0 TE |
2899 | |
2900 | } | |
2901 | ||
2902 | ext4_xattr_release_block(handle, inode, bh, ea_inode_array, | |
2903 | extra_credits); | |
2904 | /* | |
2905 | * Update i_file_acl value in the same transaction that releases | |
2906 | * block. | |
2907 | */ | |
2908 | EXT4_I(inode)->i_file_acl = 0; | |
2909 | error = ext4_mark_inode_dirty(handle, inode); | |
2910 | if (error) { | |
2911 | EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", | |
2912 | error); | |
2913 | goto cleanup; | |
2914 | } | |
aa75f4d3 | 2915 | ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR); |
30a7eb97 | 2916 | } |
dec214d0 | 2917 | error = 0; |
ac27a0ec | 2918 | cleanup: |
30a7eb97 | 2919 | brelse(iloc.bh); |
ac27a0ec | 2920 | brelse(bh); |
e50e5129 AD |
2921 | return error; |
2922 | } | |
2923 | ||
0421a189 | 2924 | void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) |
e50e5129 | 2925 | { |
dec214d0 | 2926 | int idx; |
e50e5129 | 2927 | |
0421a189 | 2928 | if (ea_inode_array == NULL) |
e50e5129 AD |
2929 | return; |
2930 | ||
dec214d0 TE |
2931 | for (idx = 0; idx < ea_inode_array->count; ++idx) |
2932 | iput(ea_inode_array->inodes[idx]); | |
0421a189 | 2933 | kfree(ea_inode_array); |
ac27a0ec DK |
2934 | } |
2935 | ||
ac27a0ec | 2936 | /* |
47387409 | 2937 | * ext4_xattr_block_cache_insert() |
ac27a0ec | 2938 | * |
47387409 | 2939 | * Create a new entry in the extended attribute block cache, and insert |
ac27a0ec DK |
2940 | * it unless such an entry is already in the cache. |
2941 | * | |
2942 | * Returns 0, or a negative error number on failure. | |
2943 | */ | |
2944 | static void | |
47387409 TE |
2945 | ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, |
2946 | struct buffer_head *bh) | |
ac27a0ec | 2947 | { |
6048c64b AG |
2948 | struct ext4_xattr_header *header = BHDR(bh); |
2949 | __u32 hash = le32_to_cpu(header->h_hash); | |
2950 | int reusable = le32_to_cpu(header->h_refcount) < | |
2951 | EXT4_XATTR_REFCOUNT_MAX; | |
ac27a0ec DK |
2952 | int error; |
2953 | ||
cdb7ee4c TE |
2954 | if (!ea_block_cache) |
2955 | return; | |
47387409 | 2956 | error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, |
6048c64b | 2957 | bh->b_blocknr, reusable); |
ac27a0ec | 2958 | if (error) { |
82939d79 | 2959 | if (error == -EBUSY) |
ac27a0ec | 2960 | ea_bdebug(bh, "already in cache"); |
82939d79 | 2961 | } else |
ac27a0ec | 2962 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
2963 | } |
2964 | ||
2965 | /* | |
617ba13b | 2966 | * ext4_xattr_cmp() |
ac27a0ec DK |
2967 | * |
2968 | * Compare two extended attribute blocks for equality. | |
2969 | * | |
2970 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
2971 | * a negative error number on errors. | |
2972 | */ | |
2973 | static int | |
617ba13b MC |
2974 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
2975 | struct ext4_xattr_header *header2) | |
ac27a0ec | 2976 | { |
617ba13b | 2977 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
2978 | |
2979 | entry1 = ENTRY(header1+1); | |
2980 | entry2 = ENTRY(header2+1); | |
2981 | while (!IS_LAST_ENTRY(entry1)) { | |
2982 | if (IS_LAST_ENTRY(entry2)) | |
2983 | return 1; | |
2984 | if (entry1->e_hash != entry2->e_hash || | |
2985 | entry1->e_name_index != entry2->e_name_index || | |
2986 | entry1->e_name_len != entry2->e_name_len || | |
2987 | entry1->e_value_size != entry2->e_value_size || | |
e50e5129 | 2988 | entry1->e_value_inum != entry2->e_value_inum || |
ac27a0ec DK |
2989 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) |
2990 | return 1; | |
7cec1918 TE |
2991 | if (!entry1->e_value_inum && |
2992 | memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), | |
ac27a0ec DK |
2993 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), |
2994 | le32_to_cpu(entry1->e_value_size))) | |
2995 | return 1; | |
2996 | ||
617ba13b MC |
2997 | entry1 = EXT4_XATTR_NEXT(entry1); |
2998 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
2999 | } |
3000 | if (!IS_LAST_ENTRY(entry2)) | |
3001 | return 1; | |
3002 | return 0; | |
3003 | } | |
3004 | ||
3005 | /* | |
47387409 | 3006 | * ext4_xattr_block_cache_find() |
ac27a0ec DK |
3007 | * |
3008 | * Find an identical extended attribute block. | |
3009 | * | |
3010 | * Returns a pointer to the block found, or NULL if such a block was | |
3011 | * not found or an error occurred. | |
3012 | */ | |
3013 | static struct buffer_head * | |
47387409 TE |
3014 | ext4_xattr_block_cache_find(struct inode *inode, |
3015 | struct ext4_xattr_header *header, | |
3016 | struct mb_cache_entry **pce) | |
ac27a0ec DK |
3017 | { |
3018 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 | 3019 | struct mb_cache_entry *ce; |
47387409 | 3020 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec | 3021 | |
cdb7ee4c TE |
3022 | if (!ea_block_cache) |
3023 | return NULL; | |
ac27a0ec DK |
3024 | if (!header->h_hash) |
3025 | return NULL; /* never share */ | |
3026 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
47387409 | 3027 | ce = mb_cache_entry_find_first(ea_block_cache, hash); |
ac27a0ec DK |
3028 | while (ce) { |
3029 | struct buffer_head *bh; | |
3030 | ||
fb265c9c TT |
3031 | bh = ext4_sb_bread(inode->i_sb, ce->e_value, REQ_PRIO); |
3032 | if (IS_ERR(bh)) { | |
3033 | if (PTR_ERR(bh) == -ENOMEM) | |
3034 | return NULL; | |
7159a986 | 3035 | bh = NULL; |
24676da4 | 3036 | EXT4_ERROR_INODE(inode, "block %lu read error", |
c07dfcb4 | 3037 | (unsigned long)ce->e_value); |
617ba13b | 3038 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
ac27a0ec DK |
3039 | *pce = ce; |
3040 | return bh; | |
3041 | } | |
3042 | brelse(bh); | |
47387409 | 3043 | ce = mb_cache_entry_find_next(ea_block_cache, ce); |
ac27a0ec DK |
3044 | } |
3045 | return NULL; | |
3046 | } | |
3047 | ||
3048 | #define NAME_HASH_SHIFT 5 | |
3049 | #define VALUE_HASH_SHIFT 16 | |
3050 | ||
3051 | /* | |
617ba13b | 3052 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
3053 | * |
3054 | * Compute the hash of an extended attribute. | |
3055 | */ | |
b9fc761e TE |
3056 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
3057 | size_t value_count) | |
ac27a0ec DK |
3058 | { |
3059 | __u32 hash = 0; | |
ac27a0ec | 3060 | |
b9fc761e | 3061 | while (name_len--) { |
ac27a0ec DK |
3062 | hash = (hash << NAME_HASH_SHIFT) ^ |
3063 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
3064 | *name++; | |
3065 | } | |
b9fc761e TE |
3066 | while (value_count--) { |
3067 | hash = (hash << VALUE_HASH_SHIFT) ^ | |
3068 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
3069 | le32_to_cpu(*value++); | |
ac27a0ec | 3070 | } |
b9fc761e | 3071 | return cpu_to_le32(hash); |
ac27a0ec DK |
3072 | } |
3073 | ||
3074 | #undef NAME_HASH_SHIFT | |
3075 | #undef VALUE_HASH_SHIFT | |
3076 | ||
3077 | #define BLOCK_HASH_SHIFT 16 | |
3078 | ||
3079 | /* | |
617ba13b | 3080 | * ext4_xattr_rehash() |
ac27a0ec DK |
3081 | * |
3082 | * Re-compute the extended attribute hash value after an entry has changed. | |
3083 | */ | |
daf83281 | 3084 | static void ext4_xattr_rehash(struct ext4_xattr_header *header) |
ac27a0ec | 3085 | { |
617ba13b | 3086 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
3087 | __u32 hash = 0; |
3088 | ||
ac27a0ec DK |
3089 | here = ENTRY(header+1); |
3090 | while (!IS_LAST_ENTRY(here)) { | |
3091 | if (!here->e_hash) { | |
3092 | /* Block is not shared if an entry's hash value == 0 */ | |
3093 | hash = 0; | |
3094 | break; | |
3095 | } | |
3096 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
3097 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
3098 | le32_to_cpu(here->e_hash); | |
617ba13b | 3099 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
3100 | } |
3101 | header->h_hash = cpu_to_le32(hash); | |
3102 | } | |
3103 | ||
3104 | #undef BLOCK_HASH_SHIFT | |
3105 | ||
9c191f70 M |
3106 | #define HASH_BUCKET_BITS 10 |
3107 | ||
7a2508e1 | 3108 | struct mb_cache * |
82939d79 | 3109 | ext4_xattr_create_cache(void) |
ac27a0ec | 3110 | { |
7a2508e1 | 3111 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
3112 | } |
3113 | ||
7a2508e1 | 3114 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 3115 | { |
9c191f70 | 3116 | if (cache) |
7a2508e1 | 3117 | mb_cache_destroy(cache); |
ac27a0ec | 3118 | } |
9c191f70 | 3119 |