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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 | ||
6bc0d63d JK |
439 | /* Remove entry from mbcache when EA inode is getting evicted */ |
440 | void ext4_evict_ea_inode(struct inode *inode) | |
441 | { | |
65f8b800 JK |
442 | struct mb_cache_entry *oe; |
443 | ||
444 | if (!EA_INODE_CACHE(inode)) | |
445 | return; | |
446 | /* Wait for entry to get unused so that we can remove it */ | |
447 | while ((oe = mb_cache_entry_delete_or_get(EA_INODE_CACHE(inode), | |
448 | ext4_xattr_inode_get_hash(inode), inode->i_ino))) { | |
449 | mb_cache_entry_wait_unused(oe); | |
450 | mb_cache_entry_put(EA_INODE_CACHE(inode), oe); | |
451 | } | |
6bc0d63d JK |
452 | } |
453 | ||
dec214d0 | 454 | static int |
b9fc761e TE |
455 | ext4_xattr_inode_verify_hashes(struct inode *ea_inode, |
456 | struct ext4_xattr_entry *entry, void *buffer, | |
457 | size_t size) | |
dec214d0 TE |
458 | { |
459 | u32 hash; | |
460 | ||
461 | /* Verify stored hash matches calculated hash. */ | |
462 | hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); | |
463 | if (hash != ext4_xattr_inode_get_hash(ea_inode)) | |
464 | return -EFSCORRUPTED; | |
b9fc761e TE |
465 | |
466 | if (entry) { | |
467 | __le32 e_hash, tmp_data; | |
468 | ||
469 | /* Verify entry hash. */ | |
470 | tmp_data = cpu_to_le32(hash); | |
471 | e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, | |
472 | &tmp_data, 1); | |
473 | if (e_hash != entry->e_hash) | |
474 | return -EFSCORRUPTED; | |
475 | } | |
dec214d0 TE |
476 | return 0; |
477 | } | |
478 | ||
e50e5129 | 479 | /* |
b9fc761e | 480 | * Read xattr value from the EA inode. |
e50e5129 AD |
481 | */ |
482 | static int | |
b9fc761e TE |
483 | ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, |
484 | void *buffer, size_t size) | |
e50e5129 | 485 | { |
dec214d0 | 486 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); |
bab79b04 | 487 | struct inode *ea_inode; |
dec214d0 | 488 | int err; |
e50e5129 | 489 | |
b9fc761e | 490 | err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), |
a6d05676 | 491 | le32_to_cpu(entry->e_hash), &ea_inode); |
dec214d0 TE |
492 | if (err) { |
493 | ea_inode = NULL; | |
494 | goto out; | |
495 | } | |
e50e5129 | 496 | |
dec214d0 TE |
497 | if (i_size_read(ea_inode) != size) { |
498 | ext4_warning_inode(ea_inode, | |
499 | "ea_inode file size=%llu entry size=%zu", | |
500 | i_size_read(ea_inode), size); | |
501 | err = -EFSCORRUPTED; | |
502 | goto out; | |
503 | } | |
e50e5129 | 504 | |
dec214d0 TE |
505 | err = ext4_xattr_inode_read(ea_inode, buffer, size); |
506 | if (err) | |
507 | goto out; | |
508 | ||
a6d05676 TE |
509 | if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { |
510 | err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, | |
511 | size); | |
512 | if (err) { | |
dec214d0 TE |
513 | ext4_warning_inode(ea_inode, |
514 | "EA inode hash validation failed"); | |
515 | goto out; | |
516 | } | |
dec214d0 | 517 | |
a6d05676 TE |
518 | if (ea_inode_cache) |
519 | mb_cache_entry_create(ea_inode_cache, GFP_NOFS, | |
520 | ext4_xattr_inode_get_hash(ea_inode), | |
521 | ea_inode->i_ino, true /* reusable */); | |
522 | } | |
dec214d0 TE |
523 | out: |
524 | iput(ea_inode); | |
525 | return err; | |
e50e5129 AD |
526 | } |
527 | ||
ac27a0ec | 528 | static int |
617ba13b | 529 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
530 | void *buffer, size_t buffer_size) |
531 | { | |
532 | struct buffer_head *bh = NULL; | |
617ba13b | 533 | struct ext4_xattr_entry *entry; |
ac27a0ec | 534 | size_t size; |
9496005d | 535 | void *end; |
ac27a0ec | 536 | int error; |
47387409 | 537 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec DK |
538 | |
539 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", | |
540 | name_index, name, buffer, (long)buffer_size); | |
541 | ||
617ba13b | 542 | if (!EXT4_I(inode)->i_file_acl) |
fb265c9c | 543 | return -ENODATA; |
ace36ad4 JP |
544 | ea_idebug(inode, "reading block %llu", |
545 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
fb265c9c TT |
546 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
547 | if (IS_ERR(bh)) | |
548 | return PTR_ERR(bh); | |
ac27a0ec DK |
549 | ea_bdebug(bh, "b_count=%d, refcount=%d", |
550 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
de05ca85 TT |
551 | error = ext4_xattr_check_block(inode, bh); |
552 | if (error) | |
ac27a0ec | 553 | goto cleanup; |
47387409 | 554 | ext4_xattr_block_cache_insert(ea_block_cache, bh); |
ac27a0ec | 555 | entry = BFIRST(bh); |
9496005d TT |
556 | end = bh->b_data + bh->b_size; |
557 | error = xattr_find_entry(inode, &entry, end, name_index, name, 1); | |
ac27a0ec DK |
558 | if (error) |
559 | goto cleanup; | |
560 | size = le32_to_cpu(entry->e_value_size); | |
54dd0e0a TT |
561 | error = -ERANGE; |
562 | if (unlikely(size > EXT4_XATTR_SIZE_MAX)) | |
563 | goto cleanup; | |
ac27a0ec | 564 | if (buffer) { |
ac27a0ec DK |
565 | if (size > buffer_size) |
566 | goto cleanup; | |
e50e5129 | 567 | if (entry->e_value_inum) { |
b9fc761e TE |
568 | error = ext4_xattr_inode_get(inode, entry, buffer, |
569 | size); | |
e50e5129 AD |
570 | if (error) |
571 | goto cleanup; | |
572 | } else { | |
54dd0e0a TT |
573 | u16 offset = le16_to_cpu(entry->e_value_offs); |
574 | void *p = bh->b_data + offset; | |
575 | ||
576 | if (unlikely(p + size > end)) | |
577 | goto cleanup; | |
578 | memcpy(buffer, p, size); | |
e50e5129 | 579 | } |
ac27a0ec DK |
580 | } |
581 | error = size; | |
582 | ||
583 | cleanup: | |
584 | brelse(bh); | |
585 | return error; | |
586 | } | |
587 | ||
879b3825 | 588 | int |
617ba13b | 589 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
590 | void *buffer, size_t buffer_size) |
591 | { | |
617ba13b MC |
592 | struct ext4_xattr_ibody_header *header; |
593 | struct ext4_xattr_entry *entry; | |
594 | struct ext4_inode *raw_inode; | |
595 | struct ext4_iloc iloc; | |
ac27a0ec DK |
596 | size_t size; |
597 | void *end; | |
598 | int error; | |
599 | ||
19f5fb7a | 600 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 601 | return -ENODATA; |
617ba13b | 602 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
603 | if (error) |
604 | return error; | |
617ba13b | 605 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 606 | header = IHDR(inode, raw_inode); |
617ba13b | 607 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 608 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
609 | if (error) |
610 | goto cleanup; | |
6ba644b9 | 611 | entry = IFIRST(header); |
9496005d | 612 | error = xattr_find_entry(inode, &entry, end, name_index, name, 0); |
ac27a0ec DK |
613 | if (error) |
614 | goto cleanup; | |
615 | size = le32_to_cpu(entry->e_value_size); | |
54dd0e0a TT |
616 | error = -ERANGE; |
617 | if (unlikely(size > EXT4_XATTR_SIZE_MAX)) | |
618 | goto cleanup; | |
ac27a0ec | 619 | if (buffer) { |
ac27a0ec DK |
620 | if (size > buffer_size) |
621 | goto cleanup; | |
e50e5129 | 622 | if (entry->e_value_inum) { |
b9fc761e TE |
623 | error = ext4_xattr_inode_get(inode, entry, buffer, |
624 | size); | |
e50e5129 AD |
625 | if (error) |
626 | goto cleanup; | |
627 | } else { | |
54dd0e0a TT |
628 | u16 offset = le16_to_cpu(entry->e_value_offs); |
629 | void *p = (void *)IFIRST(header) + offset; | |
630 | ||
631 | if (unlikely(p + size > end)) | |
632 | goto cleanup; | |
633 | memcpy(buffer, p, size); | |
e50e5129 | 634 | } |
ac27a0ec DK |
635 | } |
636 | error = size; | |
637 | ||
638 | cleanup: | |
639 | brelse(iloc.bh); | |
640 | return error; | |
641 | } | |
642 | ||
643 | /* | |
617ba13b | 644 | * ext4_xattr_get() |
ac27a0ec DK |
645 | * |
646 | * Copy an extended attribute into the buffer | |
647 | * provided, or compute the buffer size required. | |
648 | * Buffer is NULL to compute the size of the buffer required. | |
649 | * | |
650 | * Returns a negative error number on failure, or the number of bytes | |
651 | * used / required on success. | |
652 | */ | |
653 | int | |
617ba13b | 654 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
655 | void *buffer, size_t buffer_size) |
656 | { | |
657 | int error; | |
658 | ||
0db1ff22 TT |
659 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
660 | return -EIO; | |
661 | ||
230b8c1a ZZ |
662 | if (strlen(name) > 255) |
663 | return -ERANGE; | |
664 | ||
617ba13b MC |
665 | down_read(&EXT4_I(inode)->xattr_sem); |
666 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, | |
ac27a0ec DK |
667 | buffer_size); |
668 | if (error == -ENODATA) | |
617ba13b | 669 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
ac27a0ec | 670 | buffer_size); |
617ba13b | 671 | up_read(&EXT4_I(inode)->xattr_sem); |
ac27a0ec DK |
672 | return error; |
673 | } | |
674 | ||
675 | static int | |
431547b3 | 676 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
ac27a0ec DK |
677 | char *buffer, size_t buffer_size) |
678 | { | |
679 | size_t rest = buffer_size; | |
680 | ||
617ba13b | 681 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
11e27528 | 682 | const struct xattr_handler *handler = |
617ba13b | 683 | ext4_xattr_handler(entry->e_name_index); |
ac27a0ec | 684 | |
764a5c6b AG |
685 | if (handler && (!handler->list || handler->list(dentry))) { |
686 | const char *prefix = handler->prefix ?: handler->name; | |
687 | size_t prefix_len = strlen(prefix); | |
688 | size_t size = prefix_len + entry->e_name_len + 1; | |
689 | ||
ac27a0ec DK |
690 | if (buffer) { |
691 | if (size > rest) | |
692 | return -ERANGE; | |
764a5c6b AG |
693 | memcpy(buffer, prefix, prefix_len); |
694 | buffer += prefix_len; | |
695 | memcpy(buffer, entry->e_name, entry->e_name_len); | |
696 | buffer += entry->e_name_len; | |
697 | *buffer++ = 0; | |
ac27a0ec DK |
698 | } |
699 | rest -= size; | |
700 | } | |
701 | } | |
764a5c6b | 702 | return buffer_size - rest; /* total size */ |
ac27a0ec DK |
703 | } |
704 | ||
705 | static int | |
431547b3 | 706 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 707 | { |
2b0143b5 | 708 | struct inode *inode = d_inode(dentry); |
ac27a0ec DK |
709 | struct buffer_head *bh = NULL; |
710 | int error; | |
711 | ||
712 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", | |
713 | buffer, (long)buffer_size); | |
714 | ||
617ba13b | 715 | if (!EXT4_I(inode)->i_file_acl) |
fb265c9c | 716 | return 0; |
ace36ad4 JP |
717 | ea_idebug(inode, "reading block %llu", |
718 | (unsigned long long)EXT4_I(inode)->i_file_acl); | |
fb265c9c TT |
719 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
720 | if (IS_ERR(bh)) | |
721 | return PTR_ERR(bh); | |
ac27a0ec DK |
722 | ea_bdebug(bh, "b_count=%d, refcount=%d", |
723 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); | |
de05ca85 TT |
724 | error = ext4_xattr_check_block(inode, bh); |
725 | if (error) | |
ac27a0ec | 726 | goto cleanup; |
47387409 | 727 | ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); |
fb265c9c TT |
728 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, |
729 | buffer_size); | |
ac27a0ec DK |
730 | cleanup: |
731 | brelse(bh); | |
ac27a0ec DK |
732 | return error; |
733 | } | |
734 | ||
735 | static int | |
431547b3 | 736 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
ac27a0ec | 737 | { |
2b0143b5 | 738 | struct inode *inode = d_inode(dentry); |
617ba13b MC |
739 | struct ext4_xattr_ibody_header *header; |
740 | struct ext4_inode *raw_inode; | |
741 | struct ext4_iloc iloc; | |
ac27a0ec DK |
742 | void *end; |
743 | int error; | |
744 | ||
19f5fb7a | 745 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
ac27a0ec | 746 | return 0; |
617ba13b | 747 | error = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
748 | if (error) |
749 | return error; | |
617ba13b | 750 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec | 751 | header = IHDR(inode, raw_inode); |
617ba13b | 752 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
9e92f48c | 753 | error = xattr_check_inode(inode, header, end); |
ac27a0ec DK |
754 | if (error) |
755 | goto cleanup; | |
431547b3 | 756 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
ac27a0ec DK |
757 | buffer, buffer_size); |
758 | ||
759 | cleanup: | |
760 | brelse(iloc.bh); | |
761 | return error; | |
762 | } | |
763 | ||
764 | /* | |
ba7ea1d8 EB |
765 | * Inode operation listxattr() |
766 | * | |
767 | * d_inode(dentry)->i_rwsem: don't care | |
ac27a0ec DK |
768 | * |
769 | * Copy a list of attribute names into the buffer | |
770 | * provided, or compute the buffer size required. | |
771 | * Buffer is NULL to compute the size of the buffer required. | |
772 | * | |
773 | * Returns a negative error number on failure, or the number of bytes | |
774 | * used / required on success. | |
775 | */ | |
ba7ea1d8 EB |
776 | ssize_t |
777 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) | |
ac27a0ec | 778 | { |
eaeef867 | 779 | int ret, ret2; |
ac27a0ec | 780 | |
2b0143b5 | 781 | down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 TT |
782 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
783 | if (ret < 0) | |
784 | goto errout; | |
785 | if (buffer) { | |
786 | buffer += ret; | |
787 | buffer_size -= ret; | |
ac27a0ec | 788 | } |
eaeef867 TT |
789 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
790 | if (ret < 0) | |
791 | goto errout; | |
792 | ret += ret2; | |
793 | errout: | |
2b0143b5 | 794 | up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
eaeef867 | 795 | return ret; |
ac27a0ec DK |
796 | } |
797 | ||
798 | /* | |
617ba13b | 799 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
ac27a0ec DK |
800 | * not set, set it. |
801 | */ | |
617ba13b | 802 | static void ext4_xattr_update_super_block(handle_t *handle, |
ac27a0ec DK |
803 | struct super_block *sb) |
804 | { | |
e2b911c5 | 805 | if (ext4_has_feature_xattr(sb)) |
ac27a0ec DK |
806 | return; |
807 | ||
5d601255 | 808 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
188c299e JK |
809 | if (ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, |
810 | EXT4_JTR_NONE) == 0) { | |
05c2c00f | 811 | lock_buffer(EXT4_SB(sb)->s_sbh); |
e2b911c5 | 812 | ext4_set_feature_xattr(sb); |
05c2c00f JK |
813 | ext4_superblock_csum_set(sb); |
814 | unlock_buffer(EXT4_SB(sb)->s_sbh); | |
a3f5cf14 | 815 | ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); |
ac27a0ec | 816 | } |
ac27a0ec DK |
817 | } |
818 | ||
7a9ca53a TE |
819 | int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) |
820 | { | |
821 | struct ext4_iloc iloc = { .bh = NULL }; | |
822 | struct buffer_head *bh = NULL; | |
823 | struct ext4_inode *raw_inode; | |
824 | struct ext4_xattr_ibody_header *header; | |
825 | struct ext4_xattr_entry *entry; | |
826 | qsize_t ea_inode_refs = 0; | |
827 | void *end; | |
828 | int ret; | |
829 | ||
830 | lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); | |
831 | ||
832 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
833 | ret = ext4_get_inode_loc(inode, &iloc); | |
834 | if (ret) | |
835 | goto out; | |
836 | raw_inode = ext4_raw_inode(&iloc); | |
837 | header = IHDR(inode, raw_inode); | |
838 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; | |
839 | ret = xattr_check_inode(inode, header, end); | |
840 | if (ret) | |
841 | goto out; | |
842 | ||
843 | for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); | |
844 | entry = EXT4_XATTR_NEXT(entry)) | |
845 | if (entry->e_value_inum) | |
846 | ea_inode_refs++; | |
847 | } | |
848 | ||
849 | if (EXT4_I(inode)->i_file_acl) { | |
fb265c9c TT |
850 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
851 | if (IS_ERR(bh)) { | |
852 | ret = PTR_ERR(bh); | |
7159a986 | 853 | bh = NULL; |
7a9ca53a TE |
854 | goto out; |
855 | } | |
856 | ||
de05ca85 TT |
857 | ret = ext4_xattr_check_block(inode, bh); |
858 | if (ret) | |
7a9ca53a | 859 | goto out; |
7a9ca53a TE |
860 | |
861 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
862 | entry = EXT4_XATTR_NEXT(entry)) | |
863 | if (entry->e_value_inum) | |
864 | ea_inode_refs++; | |
865 | } | |
866 | *usage = ea_inode_refs + 1; | |
867 | ret = 0; | |
868 | out: | |
869 | brelse(iloc.bh); | |
870 | brelse(bh); | |
871 | return ret; | |
872 | } | |
873 | ||
dec214d0 TE |
874 | static inline size_t round_up_cluster(struct inode *inode, size_t length) |
875 | { | |
876 | struct super_block *sb = inode->i_sb; | |
877 | size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + | |
878 | inode->i_blkbits); | |
879 | size_t mask = ~(cluster_size - 1); | |
880 | ||
881 | return (length + cluster_size - 1) & mask; | |
882 | } | |
883 | ||
884 | static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) | |
885 | { | |
886 | int err; | |
887 | ||
888 | err = dquot_alloc_inode(inode); | |
889 | if (err) | |
890 | return err; | |
891 | err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); | |
892 | if (err) | |
893 | dquot_free_inode(inode); | |
894 | return err; | |
895 | } | |
896 | ||
a6d05676 TE |
897 | static void ext4_xattr_inode_free_quota(struct inode *parent, |
898 | struct inode *ea_inode, | |
899 | size_t len) | |
dec214d0 | 900 | { |
a6d05676 TE |
901 | if (ea_inode && |
902 | ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) | |
903 | return; | |
904 | dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); | |
905 | dquot_free_inode(parent); | |
dec214d0 TE |
906 | } |
907 | ||
af65207c TE |
908 | int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, |
909 | struct buffer_head *block_bh, size_t value_len, | |
910 | bool is_create) | |
dec214d0 | 911 | { |
dec214d0 TE |
912 | int credits; |
913 | int blocks; | |
914 | ||
915 | /* | |
916 | * 1) Owner inode update | |
917 | * 2) Ref count update on old xattr block | |
918 | * 3) new xattr block | |
919 | * 4) block bitmap update for new xattr block | |
920 | * 5) group descriptor for new xattr block | |
921 | * 6) block bitmap update for old xattr block | |
922 | * 7) group descriptor for old block | |
923 | * | |
924 | * 6 & 7 can happen if we have two racing threads T_a and T_b | |
925 | * which are each trying to set an xattr on inodes I_a and I_b | |
926 | * which were both initially sharing an xattr block. | |
927 | */ | |
928 | credits = 7; | |
929 | ||
930 | /* Quota updates. */ | |
931 | credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); | |
932 | ||
933 | /* | |
934 | * In case of inline data, we may push out the data to a block, | |
935 | * so we need to reserve credits for this eventuality | |
936 | */ | |
af65207c | 937 | if (inode && ext4_has_inline_data(inode)) |
dec214d0 TE |
938 | credits += ext4_writepage_trans_blocks(inode) + 1; |
939 | ||
940 | /* We are done if ea_inode feature is not enabled. */ | |
941 | if (!ext4_has_feature_ea_inode(sb)) | |
942 | return credits; | |
943 | ||
944 | /* New ea_inode, inode map, block bitmap, group descriptor. */ | |
945 | credits += 4; | |
946 | ||
947 | /* Data blocks. */ | |
948 | blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; | |
949 | ||
950 | /* Indirection block or one level of extent tree. */ | |
951 | blocks += 1; | |
952 | ||
953 | /* Block bitmap and group descriptor updates for each block. */ | |
954 | credits += blocks * 2; | |
955 | ||
956 | /* Blocks themselves. */ | |
957 | credits += blocks; | |
958 | ||
af65207c TE |
959 | if (!is_create) { |
960 | /* Dereference ea_inode holding old xattr value. | |
961 | * Old ea_inode, inode map, block bitmap, group descriptor. | |
962 | */ | |
963 | credits += 4; | |
dec214d0 | 964 | |
af65207c TE |
965 | /* Data blocks for old ea_inode. */ |
966 | blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; | |
dec214d0 | 967 | |
af65207c TE |
968 | /* Indirection block or one level of extent tree for old |
969 | * ea_inode. | |
970 | */ | |
971 | blocks += 1; | |
dec214d0 | 972 | |
af65207c TE |
973 | /* Block bitmap and group descriptor updates for each block. */ |
974 | credits += blocks * 2; | |
975 | } | |
dec214d0 TE |
976 | |
977 | /* We may need to clone the existing xattr block in which case we need | |
978 | * to increment ref counts for existing ea_inodes referenced by it. | |
979 | */ | |
980 | if (block_bh) { | |
981 | struct ext4_xattr_entry *entry = BFIRST(block_bh); | |
982 | ||
983 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) | |
984 | if (entry->e_value_inum) | |
985 | /* Ref count update on ea_inode. */ | |
986 | credits += 1; | |
987 | } | |
988 | return credits; | |
989 | } | |
990 | ||
dec214d0 TE |
991 | static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, |
992 | int ref_change) | |
993 | { | |
dec214d0 TE |
994 | struct ext4_iloc iloc; |
995 | s64 ref_count; | |
dec214d0 TE |
996 | int ret; |
997 | ||
998 | inode_lock(ea_inode); | |
999 | ||
1000 | ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); | |
1bfc204d | 1001 | if (ret) |
dec214d0 | 1002 | goto out; |
dec214d0 TE |
1003 | |
1004 | ref_count = ext4_xattr_inode_get_ref(ea_inode); | |
1005 | ref_count += ref_change; | |
1006 | ext4_xattr_inode_set_ref(ea_inode, ref_count); | |
1007 | ||
1008 | if (ref_change > 0) { | |
1009 | WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", | |
1010 | ea_inode->i_ino, ref_count); | |
1011 | ||
1012 | if (ref_count == 1) { | |
1013 | WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", | |
1014 | ea_inode->i_ino, ea_inode->i_nlink); | |
1015 | ||
1016 | set_nlink(ea_inode, 1); | |
1017 | ext4_orphan_del(handle, ea_inode); | |
dec214d0 TE |
1018 | } |
1019 | } else { | |
1020 | WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", | |
1021 | ea_inode->i_ino, ref_count); | |
1022 | ||
1023 | if (ref_count == 0) { | |
1024 | WARN_ONCE(ea_inode->i_nlink != 1, | |
1025 | "EA inode %lu i_nlink=%u", | |
1026 | ea_inode->i_ino, ea_inode->i_nlink); | |
1027 | ||
1028 | clear_nlink(ea_inode); | |
1029 | ext4_orphan_add(handle, ea_inode); | |
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 | 1171 | if (err > 0) { |
188c299e JK |
1172 | err = ext4_journal_get_write_access(handle, |
1173 | parent->i_sb, bh, EXT4_JTR_NONE); | |
a4130367 JK |
1174 | if (err) { |
1175 | ext4_warning_inode(ea_inode, | |
1176 | "Re-get write access err=%d", | |
1177 | err); | |
1178 | continue; | |
1179 | } | |
1180 | } | |
30a7eb97 | 1181 | |
dec214d0 TE |
1182 | err = ext4_xattr_inode_dec_ref(handle, ea_inode); |
1183 | if (err) { | |
1184 | ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", | |
1185 | err); | |
1186 | continue; | |
1187 | } | |
1188 | ||
1189 | if (!skip_quota) | |
a6d05676 | 1190 | ext4_xattr_inode_free_quota(parent, ea_inode, |
dec214d0 | 1191 | le32_to_cpu(entry->e_value_size)); |
30a7eb97 TE |
1192 | |
1193 | /* | |
1194 | * Forget about ea_inode within the same transaction that | |
1195 | * decrements the ref count. This avoids duplicate decrements in | |
1196 | * case the rest of the work spills over to subsequent | |
1197 | * transactions. | |
1198 | */ | |
1199 | entry->e_value_inum = 0; | |
1200 | entry->e_value_size = 0; | |
1201 | ||
1202 | dirty = true; | |
1203 | } | |
1204 | ||
1205 | if (dirty) { | |
1206 | /* | |
1207 | * Note that we are deliberately skipping csum calculation for | |
1208 | * the final update because we do not expect any journal | |
1209 | * restarts until xattr block is freed. | |
1210 | */ | |
1211 | ||
1212 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
1213 | if (err) | |
1214 | ext4_warning_inode(parent, | |
1215 | "handle dirty metadata err=%d", err); | |
1216 | } | |
1217 | } | |
1218 | ||
ac27a0ec | 1219 | /* |
ec4cb1aa JK |
1220 | * Release the xattr block BH: If the reference count is > 1, decrement it; |
1221 | * otherwise free the block. | |
ac27a0ec DK |
1222 | */ |
1223 | static void | |
617ba13b | 1224 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
dec214d0 TE |
1225 | struct buffer_head *bh, |
1226 | struct ext4_xattr_inode_array **ea_inode_array, | |
1227 | int extra_credits) | |
ac27a0ec | 1228 | { |
47387409 | 1229 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
6048c64b | 1230 | u32 hash, ref; |
8a2bfdcb | 1231 | int error = 0; |
ac27a0ec | 1232 | |
5d601255 | 1233 | BUFFER_TRACE(bh, "get_write_access"); |
188c299e JK |
1234 | error = ext4_journal_get_write_access(handle, inode->i_sb, bh, |
1235 | EXT4_JTR_NONE); | |
8a2bfdcb MC |
1236 | if (error) |
1237 | goto out; | |
1238 | ||
65f8b800 | 1239 | retry_ref: |
8a2bfdcb | 1240 | lock_buffer(bh); |
6048c64b AG |
1241 | hash = le32_to_cpu(BHDR(bh)->h_hash); |
1242 | ref = le32_to_cpu(BHDR(bh)->h_refcount); | |
1243 | if (ref == 1) { | |
ac27a0ec | 1244 | ea_bdebug(bh, "refcount now=0; freeing"); |
82939d79 JK |
1245 | /* |
1246 | * This must happen under buffer lock for | |
1247 | * ext4_xattr_block_set() to reliably detect freed block | |
1248 | */ | |
65f8b800 JK |
1249 | if (ea_block_cache) { |
1250 | struct mb_cache_entry *oe; | |
1251 | ||
1252 | oe = mb_cache_entry_delete_or_get(ea_block_cache, hash, | |
1253 | bh->b_blocknr); | |
1254 | if (oe) { | |
1255 | unlock_buffer(bh); | |
1256 | mb_cache_entry_wait_unused(oe); | |
1257 | mb_cache_entry_put(ea_block_cache, oe); | |
1258 | goto retry_ref; | |
1259 | } | |
1260 | } | |
ac27a0ec | 1261 | get_bh(bh); |
ec4cb1aa | 1262 | unlock_buffer(bh); |
dec214d0 TE |
1263 | |
1264 | if (ext4_has_feature_ea_inode(inode->i_sb)) | |
1265 | ext4_xattr_inode_dec_ref_all(handle, inode, bh, | |
1266 | BFIRST(bh), | |
1267 | true /* block_csum */, | |
1268 | ea_inode_array, | |
1269 | extra_credits, | |
1270 | true /* skip_quota */); | |
e6362609 TT |
1271 | ext4_free_blocks(handle, inode, bh, 0, 1, |
1272 | EXT4_FREE_BLOCKS_METADATA | | |
1273 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 1274 | } else { |
6048c64b AG |
1275 | ref--; |
1276 | BHDR(bh)->h_refcount = cpu_to_le32(ref); | |
1277 | if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { | |
1278 | struct mb_cache_entry *ce; | |
1279 | ||
cdb7ee4c TE |
1280 | if (ea_block_cache) { |
1281 | ce = mb_cache_entry_get(ea_block_cache, hash, | |
1282 | bh->b_blocknr); | |
1283 | if (ce) { | |
1284 | ce->e_reusable = 1; | |
1285 | mb_cache_entry_put(ea_block_cache, ce); | |
1286 | } | |
6048c64b AG |
1287 | } |
1288 | } | |
1289 | ||
dac7a4b4 | 1290 | ext4_xattr_block_csum_set(inode, bh); |
ec4cb1aa JK |
1291 | /* |
1292 | * Beware of this ugliness: Releasing of xattr block references | |
1293 | * from different inodes can race and so we have to protect | |
1294 | * from a race where someone else frees the block (and releases | |
1295 | * its journal_head) before we are done dirtying the buffer. In | |
1296 | * nojournal mode this race is harmless and we actually cannot | |
dac7a4b4 | 1297 | * call ext4_handle_dirty_metadata() with locked buffer as |
ec4cb1aa JK |
1298 | * that function can call sync_dirty_buffer() so for that case |
1299 | * we handle the dirtying after unlocking the buffer. | |
1300 | */ | |
1301 | if (ext4_handle_valid(handle)) | |
dac7a4b4 | 1302 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
c1bb05a6 | 1303 | unlock_buffer(bh); |
ec4cb1aa | 1304 | if (!ext4_handle_valid(handle)) |
dac7a4b4 | 1305 | error = ext4_handle_dirty_metadata(handle, inode, bh); |
8a2bfdcb | 1306 | if (IS_SYNC(inode)) |
0390131b | 1307 | ext4_handle_sync(handle); |
1231b3a1 | 1308 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
8a2bfdcb MC |
1309 | ea_bdebug(bh, "refcount now=%d; releasing", |
1310 | le32_to_cpu(BHDR(bh)->h_refcount)); | |
ac27a0ec | 1311 | } |
8a2bfdcb MC |
1312 | out: |
1313 | ext4_std_error(inode->i_sb, error); | |
1314 | return; | |
ac27a0ec DK |
1315 | } |
1316 | ||
6dd4ee7c KS |
1317 | /* |
1318 | * Find the available free space for EAs. This also returns the total number of | |
1319 | * bytes used by EA entries. | |
1320 | */ | |
1321 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, | |
1322 | size_t *min_offs, void *base, int *total) | |
1323 | { | |
1324 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 1325 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
1326 | size_t offs = le16_to_cpu(last->e_value_offs); |
1327 | if (offs < *min_offs) | |
1328 | *min_offs = offs; | |
1329 | } | |
7b1b2c1b TT |
1330 | if (total) |
1331 | *total += EXT4_XATTR_LEN(last->e_name_len); | |
6dd4ee7c KS |
1332 | } |
1333 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); | |
1334 | } | |
1335 | ||
e50e5129 AD |
1336 | /* |
1337 | * Write the value of the EA in an inode. | |
1338 | */ | |
1339 | static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, | |
1340 | const void *buf, int bufsize) | |
1341 | { | |
1342 | struct buffer_head *bh = NULL; | |
1343 | unsigned long block = 0; | |
dec214d0 TE |
1344 | int blocksize = ea_inode->i_sb->s_blocksize; |
1345 | int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; | |
e50e5129 | 1346 | int csize, wsize = 0; |
4209ae12 | 1347 | int ret = 0, ret2 = 0; |
e50e5129 AD |
1348 | int retries = 0; |
1349 | ||
1350 | retry: | |
1351 | while (ret >= 0 && ret < max_blocks) { | |
1352 | struct ext4_map_blocks map; | |
1353 | map.m_lblk = block += ret; | |
1354 | map.m_len = max_blocks -= ret; | |
1355 | ||
1356 | ret = ext4_map_blocks(handle, ea_inode, &map, | |
1357 | EXT4_GET_BLOCKS_CREATE); | |
1358 | if (ret <= 0) { | |
1359 | ext4_mark_inode_dirty(handle, ea_inode); | |
1360 | if (ret == -ENOSPC && | |
1361 | ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { | |
1362 | ret = 0; | |
1363 | goto retry; | |
1364 | } | |
1365 | break; | |
1366 | } | |
1367 | } | |
1368 | ||
1369 | if (ret < 0) | |
1370 | return ret; | |
1371 | ||
1372 | block = 0; | |
1373 | while (wsize < bufsize) { | |
e0f49d27 | 1374 | brelse(bh); |
e50e5129 AD |
1375 | csize = (bufsize - wsize) > blocksize ? blocksize : |
1376 | bufsize - wsize; | |
1377 | bh = ext4_getblk(handle, ea_inode, block, 0); | |
1378 | if (IS_ERR(bh)) | |
1379 | return PTR_ERR(bh); | |
eb6984fa VA |
1380 | if (!bh) { |
1381 | WARN_ON_ONCE(1); | |
1382 | EXT4_ERROR_INODE(ea_inode, | |
1383 | "ext4_getblk() return bh = NULL"); | |
1384 | return -EFSCORRUPTED; | |
1385 | } | |
188c299e JK |
1386 | ret = ext4_journal_get_write_access(handle, ea_inode->i_sb, bh, |
1387 | EXT4_JTR_NONE); | |
e50e5129 AD |
1388 | if (ret) |
1389 | goto out; | |
1390 | ||
1391 | memcpy(bh->b_data, buf, csize); | |
1392 | set_buffer_uptodate(bh); | |
1393 | ext4_handle_dirty_metadata(handle, ea_inode, bh); | |
1394 | ||
1395 | buf += csize; | |
1396 | wsize += csize; | |
1397 | block += 1; | |
1398 | } | |
1399 | ||
1400 | inode_lock(ea_inode); | |
1401 | i_size_write(ea_inode, wsize); | |
1402 | ext4_update_i_disksize(ea_inode, wsize); | |
1403 | inode_unlock(ea_inode); | |
1404 | ||
4209ae12 HS |
1405 | ret2 = ext4_mark_inode_dirty(handle, ea_inode); |
1406 | if (unlikely(ret2 && !ret)) | |
1407 | ret = ret2; | |
e50e5129 AD |
1408 | |
1409 | out: | |
1410 | brelse(bh); | |
1411 | ||
1412 | return ret; | |
1413 | } | |
1414 | ||
1415 | /* | |
1416 | * Create an inode to store the value of a large EA. | |
1417 | */ | |
1418 | static struct inode *ext4_xattr_inode_create(handle_t *handle, | |
dec214d0 | 1419 | struct inode *inode, u32 hash) |
e50e5129 AD |
1420 | { |
1421 | struct inode *ea_inode = NULL; | |
9e1ba001 | 1422 | uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; |
bd3b963b | 1423 | int err; |
e50e5129 AD |
1424 | |
1425 | /* | |
1426 | * Let the next inode be the goal, so we try and allocate the EA inode | |
1427 | * in the same group, or nearby one. | |
1428 | */ | |
1429 | ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, | |
9e1ba001 | 1430 | S_IFREG | 0600, NULL, inode->i_ino + 1, owner, |
1b917ed8 | 1431 | EXT4_EA_INODE_FL); |
e50e5129 AD |
1432 | if (!IS_ERR(ea_inode)) { |
1433 | ea_inode->i_op = &ext4_file_inode_operations; | |
1434 | ea_inode->i_fop = &ext4_file_operations; | |
1435 | ext4_set_aops(ea_inode); | |
33d201e0 | 1436 | ext4_xattr_inode_set_class(ea_inode); |
e50e5129 | 1437 | unlock_new_inode(ea_inode); |
dec214d0 TE |
1438 | ext4_xattr_inode_set_ref(ea_inode, 1); |
1439 | ext4_xattr_inode_set_hash(ea_inode, hash); | |
1440 | err = ext4_mark_inode_dirty(handle, ea_inode); | |
1441 | if (!err) | |
1442 | err = ext4_inode_attach_jinode(ea_inode); | |
bd3b963b TE |
1443 | if (err) { |
1444 | iput(ea_inode); | |
1445 | return ERR_PTR(err); | |
1446 | } | |
dec214d0 TE |
1447 | |
1448 | /* | |
1449 | * Xattr inodes are shared therefore quota charging is performed | |
1450 | * at a higher level. | |
1451 | */ | |
1452 | dquot_free_inode(ea_inode); | |
1453 | dquot_drop(ea_inode); | |
1454 | inode_lock(ea_inode); | |
1455 | ea_inode->i_flags |= S_NOQUOTA; | |
1456 | inode_unlock(ea_inode); | |
e50e5129 AD |
1457 | } |
1458 | ||
1459 | return ea_inode; | |
1460 | } | |
1461 | ||
dec214d0 TE |
1462 | static struct inode * |
1463 | ext4_xattr_inode_cache_find(struct inode *inode, const void *value, | |
1464 | size_t value_len, u32 hash) | |
e50e5129 | 1465 | { |
dec214d0 TE |
1466 | struct inode *ea_inode; |
1467 | struct mb_cache_entry *ce; | |
1468 | struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); | |
1469 | void *ea_data; | |
1470 | ||
cdb7ee4c TE |
1471 | if (!ea_inode_cache) |
1472 | return NULL; | |
1473 | ||
dec214d0 TE |
1474 | ce = mb_cache_entry_find_first(ea_inode_cache, hash); |
1475 | if (!ce) | |
1476 | return NULL; | |
1477 | ||
163f0ec1 JK |
1478 | WARN_ON_ONCE(ext4_handle_valid(journal_current_handle()) && |
1479 | !(current->flags & PF_MEMALLOC_NOFS)); | |
1480 | ||
71b565ce | 1481 | ea_data = kvmalloc(value_len, GFP_KERNEL); |
dec214d0 TE |
1482 | if (!ea_data) { |
1483 | mb_cache_entry_put(ea_inode_cache, ce); | |
1484 | return NULL; | |
1485 | } | |
e50e5129 | 1486 | |
dec214d0 | 1487 | while (ce) { |
8a363970 TT |
1488 | ea_inode = ext4_iget(inode->i_sb, ce->e_value, |
1489 | EXT4_IGET_NORMAL); | |
dec214d0 TE |
1490 | if (!IS_ERR(ea_inode) && |
1491 | !is_bad_inode(ea_inode) && | |
1492 | (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && | |
1493 | i_size_read(ea_inode) == value_len && | |
1494 | !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && | |
b9fc761e TE |
1495 | !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, |
1496 | value_len) && | |
dec214d0 TE |
1497 | !memcmp(value, ea_data, value_len)) { |
1498 | mb_cache_entry_touch(ea_inode_cache, ce); | |
1499 | mb_cache_entry_put(ea_inode_cache, ce); | |
1500 | kvfree(ea_data); | |
1501 | return ea_inode; | |
1502 | } | |
e50e5129 | 1503 | |
dec214d0 TE |
1504 | if (!IS_ERR(ea_inode)) |
1505 | iput(ea_inode); | |
1506 | ce = mb_cache_entry_find_next(ea_inode_cache, ce); | |
1507 | } | |
1508 | kvfree(ea_data); | |
1509 | return NULL; | |
e50e5129 AD |
1510 | } |
1511 | ||
1512 | /* | |
1513 | * Add value of the EA in an inode. | |
1514 | */ | |
dec214d0 TE |
1515 | static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, |
1516 | const void *value, size_t value_len, | |
1517 | struct inode **ret_inode) | |
e50e5129 AD |
1518 | { |
1519 | struct inode *ea_inode; | |
dec214d0 | 1520 | u32 hash; |
e50e5129 AD |
1521 | int err; |
1522 | ||
dec214d0 TE |
1523 | hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); |
1524 | ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); | |
1525 | if (ea_inode) { | |
1526 | err = ext4_xattr_inode_inc_ref(handle, ea_inode); | |
1527 | if (err) { | |
1528 | iput(ea_inode); | |
1529 | return err; | |
1530 | } | |
1531 | ||
1532 | *ret_inode = ea_inode; | |
1533 | return 0; | |
1534 | } | |
1535 | ||
e50e5129 | 1536 | /* Create an inode for the EA value */ |
dec214d0 | 1537 | ea_inode = ext4_xattr_inode_create(handle, inode, hash); |
e50e5129 AD |
1538 | if (IS_ERR(ea_inode)) |
1539 | return PTR_ERR(ea_inode); | |
1540 | ||
1541 | err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); | |
dec214d0 TE |
1542 | if (err) { |
1543 | ext4_xattr_inode_dec_ref(handle, ea_inode); | |
1544 | iput(ea_inode); | |
1545 | return err; | |
1546 | } | |
e50e5129 | 1547 | |
cdb7ee4c TE |
1548 | if (EA_INODE_CACHE(inode)) |
1549 | mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, | |
1550 | ea_inode->i_ino, true /* reusable */); | |
e50e5129 | 1551 | |
dec214d0 TE |
1552 | *ret_inode = ea_inode; |
1553 | return 0; | |
e50e5129 AD |
1554 | } |
1555 | ||
9c6e7853 TE |
1556 | /* |
1557 | * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode | |
1558 | * feature is enabled. | |
1559 | */ | |
1560 | #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) | |
1561 | ||
e50e5129 AD |
1562 | static int ext4_xattr_set_entry(struct ext4_xattr_info *i, |
1563 | struct ext4_xattr_search *s, | |
daf83281 TE |
1564 | handle_t *handle, struct inode *inode, |
1565 | bool is_block) | |
ac27a0ec | 1566 | { |
5369a762 | 1567 | struct ext4_xattr_entry *last, *next; |
dec214d0 TE |
1568 | struct ext4_xattr_entry *here = s->here; |
1569 | size_t min_offs = s->end - s->base, name_len = strlen(i->name); | |
e50e5129 | 1570 | int in_inode = i->in_inode; |
dec214d0 TE |
1571 | struct inode *old_ea_inode = NULL; |
1572 | struct inode *new_ea_inode = NULL; | |
1573 | size_t old_size, new_size; | |
1574 | int ret; | |
1575 | ||
1576 | /* Space used by old and new values. */ | |
1577 | old_size = (!s->not_found && !here->e_value_inum) ? | |
1578 | EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; | |
1579 | new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; | |
1580 | ||
1581 | /* | |
1582 | * Optimization for the simple case when old and new values have the | |
1583 | * same padded sizes. Not applicable if external inodes are involved. | |
1584 | */ | |
1585 | if (new_size && new_size == old_size) { | |
1586 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1587 | void *val = s->base + offs; | |
1588 | ||
1589 | here->e_value_size = cpu_to_le32(i->value_len); | |
1590 | if (i->value == EXT4_ZERO_XATTR_VALUE) { | |
1591 | memset(val, 0, new_size); | |
1592 | } else { | |
1593 | memcpy(val, i->value, i->value_len); | |
1594 | /* Clear padding bytes. */ | |
1595 | memset(val + i->value_len, 0, new_size - i->value_len); | |
1596 | } | |
32aaf194 | 1597 | goto update_hash; |
dec214d0 | 1598 | } |
e50e5129 | 1599 | |
ac27a0ec DK |
1600 | /* Compute min_offs and last. */ |
1601 | last = s->first; | |
5369a762 TT |
1602 | for (; !IS_LAST_ENTRY(last); last = next) { |
1603 | next = EXT4_XATTR_NEXT(last); | |
1604 | if ((void *)next >= s->end) { | |
1605 | EXT4_ERROR_INODE(inode, "corrupted xattr entries"); | |
1606 | ret = -EFSCORRUPTED; | |
1607 | goto out; | |
1608 | } | |
e50e5129 | 1609 | if (!last->e_value_inum && last->e_value_size) { |
ac27a0ec DK |
1610 | size_t offs = le16_to_cpu(last->e_value_offs); |
1611 | if (offs < min_offs) | |
1612 | min_offs = offs; | |
1613 | } | |
1614 | } | |
dec214d0 TE |
1615 | |
1616 | /* Check whether we have enough space. */ | |
ac27a0ec | 1617 | if (i->value) { |
dec214d0 | 1618 | size_t free; |
e50e5129 | 1619 | |
dec214d0 TE |
1620 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); |
1621 | if (!s->not_found) | |
1622 | free += EXT4_XATTR_LEN(name_len) + old_size; | |
e50e5129 | 1623 | |
dec214d0 TE |
1624 | if (free < EXT4_XATTR_LEN(name_len) + new_size) { |
1625 | ret = -ENOSPC; | |
1626 | goto out; | |
1627 | } | |
9c6e7853 TE |
1628 | |
1629 | /* | |
1630 | * If storing the value in an external inode is an option, | |
1631 | * reserve space for xattr entries/names in the external | |
1632 | * attribute block so that a long value does not occupy the | |
3088e5a5 | 1633 | * whole space and prevent further entries being added. |
9c6e7853 | 1634 | */ |
daf83281 TE |
1635 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
1636 | new_size && is_block && | |
9c6e7853 TE |
1637 | (min_offs + old_size - new_size) < |
1638 | EXT4_XATTR_BLOCK_RESERVE(inode)) { | |
1639 | ret = -ENOSPC; | |
1640 | goto out; | |
1641 | } | |
ac27a0ec DK |
1642 | } |
1643 | ||
dec214d0 TE |
1644 | /* |
1645 | * Getting access to old and new ea inodes is subject to failures. | |
1646 | * Finish that work before doing any modifications to the xattr data. | |
1647 | */ | |
1648 | if (!s->not_found && here->e_value_inum) { | |
1649 | ret = ext4_xattr_inode_iget(inode, | |
1650 | le32_to_cpu(here->e_value_inum), | |
a6d05676 | 1651 | le32_to_cpu(here->e_hash), |
dec214d0 TE |
1652 | &old_ea_inode); |
1653 | if (ret) { | |
1654 | old_ea_inode = NULL; | |
1655 | goto out; | |
1656 | } | |
1657 | } | |
1658 | if (i->value && in_inode) { | |
1659 | WARN_ON_ONCE(!i->value_len); | |
ac27a0ec | 1660 | |
dec214d0 TE |
1661 | ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); |
1662 | if (ret) | |
1663 | goto out; | |
1664 | ||
1665 | ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, | |
1666 | i->value_len, | |
1667 | &new_ea_inode); | |
1668 | if (ret) { | |
1669 | new_ea_inode = NULL; | |
a6d05676 | 1670 | ext4_xattr_inode_free_quota(inode, NULL, i->value_len); |
dec214d0 | 1671 | goto out; |
ac27a0ec | 1672 | } |
dec214d0 TE |
1673 | } |
1674 | ||
1675 | if (old_ea_inode) { | |
1676 | /* We are ready to release ref count on the old_ea_inode. */ | |
1677 | ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); | |
1678 | if (ret) { | |
1679 | /* Release newly required ref count on new_ea_inode. */ | |
1680 | if (new_ea_inode) { | |
1681 | int err; | |
1682 | ||
1683 | err = ext4_xattr_inode_dec_ref(handle, | |
1684 | new_ea_inode); | |
1685 | if (err) | |
1686 | ext4_warning_inode(new_ea_inode, | |
1687 | "dec ref new_ea_inode err=%d", | |
1688 | err); | |
a6d05676 | 1689 | ext4_xattr_inode_free_quota(inode, new_ea_inode, |
dec214d0 TE |
1690 | i->value_len); |
1691 | } | |
1692 | goto out; | |
e50e5129 | 1693 | } |
dec214d0 | 1694 | |
a6d05676 | 1695 | ext4_xattr_inode_free_quota(inode, old_ea_inode, |
dec214d0 TE |
1696 | le32_to_cpu(here->e_value_size)); |
1697 | } | |
1698 | ||
1699 | /* No failures allowed past this point. */ | |
1700 | ||
e5d01196 | 1701 | if (!s->not_found && here->e_value_size && !here->e_value_inum) { |
dec214d0 TE |
1702 | /* Remove the old value. */ |
1703 | void *first_val = s->base + min_offs; | |
1704 | size_t offs = le16_to_cpu(here->e_value_offs); | |
1705 | void *val = s->base + offs; | |
1706 | ||
1707 | memmove(first_val + old_size, first_val, val - first_val); | |
1708 | memset(first_val, 0, old_size); | |
1709 | min_offs += old_size; | |
1710 | ||
1711 | /* Adjust all value offsets. */ | |
1712 | last = s->first; | |
1713 | while (!IS_LAST_ENTRY(last)) { | |
1714 | size_t o = le16_to_cpu(last->e_value_offs); | |
1715 | ||
1716 | if (!last->e_value_inum && | |
1717 | last->e_value_size && o < offs) | |
1718 | last->e_value_offs = cpu_to_le16(o + old_size); | |
1719 | last = EXT4_XATTR_NEXT(last); | |
ac27a0ec DK |
1720 | } |
1721 | } | |
1722 | ||
dec214d0 TE |
1723 | if (!i->value) { |
1724 | /* Remove old name. */ | |
1725 | size_t size = EXT4_XATTR_LEN(name_len); | |
1726 | ||
1727 | last = ENTRY((void *)last - size); | |
1728 | memmove(here, (void *)here + size, | |
1729 | (void *)last - (void *)here + sizeof(__u32)); | |
1730 | memset(last, 0, size); | |
1731 | } else if (s->not_found) { | |
1732 | /* Insert new name. */ | |
1733 | size_t size = EXT4_XATTR_LEN(name_len); | |
1734 | size_t rest = (void *)last - (void *)here + sizeof(__u32); | |
1735 | ||
1736 | memmove((void *)here + size, here, rest); | |
1737 | memset(here, 0, size); | |
1738 | here->e_name_index = i->name_index; | |
1739 | here->e_name_len = name_len; | |
1740 | memcpy(here->e_name, i->name, name_len); | |
1741 | } else { | |
1742 | /* This is an update, reset value info. */ | |
1743 | here->e_value_inum = 0; | |
1744 | here->e_value_offs = 0; | |
1745 | here->e_value_size = 0; | |
1746 | } | |
1747 | ||
ac27a0ec | 1748 | if (i->value) { |
dec214d0 | 1749 | /* Insert new value. */ |
e50e5129 | 1750 | if (in_inode) { |
dec214d0 | 1751 | here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); |
e50e5129 | 1752 | } else if (i->value_len) { |
dec214d0 TE |
1753 | void *val = s->base + min_offs - new_size; |
1754 | ||
1755 | here->e_value_offs = cpu_to_le16(min_offs - new_size); | |
bd9926e8 | 1756 | if (i->value == EXT4_ZERO_XATTR_VALUE) { |
dec214d0 | 1757 | memset(val, 0, new_size); |
bd9926e8 | 1758 | } else { |
bd9926e8 | 1759 | memcpy(val, i->value, i->value_len); |
dec214d0 TE |
1760 | /* Clear padding bytes. */ |
1761 | memset(val + i->value_len, 0, | |
1762 | new_size - i->value_len); | |
bd9926e8 | 1763 | } |
ac27a0ec | 1764 | } |
dec214d0 | 1765 | here->e_value_size = cpu_to_le32(i->value_len); |
ac27a0ec | 1766 | } |
daf83281 | 1767 | |
32aaf194 | 1768 | update_hash: |
b9fc761e TE |
1769 | if (i->value) { |
1770 | __le32 hash = 0; | |
1771 | ||
1772 | /* Entry hash calculation. */ | |
1773 | if (in_inode) { | |
1774 | __le32 crc32c_hash; | |
1775 | ||
1776 | /* | |
1777 | * Feed crc32c hash instead of the raw value for entry | |
1778 | * hash calculation. This is to avoid walking | |
1779 | * potentially long value buffer again. | |
1780 | */ | |
1781 | crc32c_hash = cpu_to_le32( | |
1782 | ext4_xattr_inode_get_hash(new_ea_inode)); | |
1783 | hash = ext4_xattr_hash_entry(here->e_name, | |
1784 | here->e_name_len, | |
1785 | &crc32c_hash, 1); | |
1786 | } else if (is_block) { | |
32aaf194 TE |
1787 | __le32 *value = s->base + le16_to_cpu( |
1788 | here->e_value_offs); | |
b9fc761e TE |
1789 | |
1790 | hash = ext4_xattr_hash_entry(here->e_name, | |
1791 | here->e_name_len, value, | |
1792 | new_size >> 2); | |
1793 | } | |
1794 | here->e_hash = hash; | |
daf83281 TE |
1795 | } |
1796 | ||
b9fc761e TE |
1797 | if (is_block) |
1798 | ext4_xattr_rehash((struct ext4_xattr_header *)s->base); | |
1799 | ||
dec214d0 | 1800 | ret = 0; |
e50e5129 | 1801 | out: |
dec214d0 TE |
1802 | iput(old_ea_inode); |
1803 | iput(new_ea_inode); | |
1804 | return ret; | |
ac27a0ec DK |
1805 | } |
1806 | ||
617ba13b MC |
1807 | struct ext4_xattr_block_find { |
1808 | struct ext4_xattr_search s; | |
ac27a0ec DK |
1809 | struct buffer_head *bh; |
1810 | }; | |
1811 | ||
1812 | static int | |
617ba13b MC |
1813 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
1814 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1815 | { |
1816 | struct super_block *sb = inode->i_sb; | |
1817 | int error; | |
1818 | ||
1819 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", | |
1820 | i->name_index, i->name, i->value, (long)i->value_len); | |
1821 | ||
617ba13b | 1822 | if (EXT4_I(inode)->i_file_acl) { |
ac27a0ec | 1823 | /* The inode already has an extended attribute block. */ |
fb265c9c | 1824 | bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
8418897f JX |
1825 | if (IS_ERR(bs->bh)) { |
1826 | error = PTR_ERR(bs->bh); | |
1827 | bs->bh = NULL; | |
1828 | return error; | |
1829 | } | |
ac27a0ec DK |
1830 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", |
1831 | atomic_read(&(bs->bh->b_count)), | |
1832 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); | |
de05ca85 TT |
1833 | error = ext4_xattr_check_block(inode, bs->bh); |
1834 | if (error) | |
fb265c9c | 1835 | return error; |
ac27a0ec DK |
1836 | /* Find the named attribute. */ |
1837 | bs->s.base = BHDR(bs->bh); | |
1838 | bs->s.first = BFIRST(bs->bh); | |
1839 | bs->s.end = bs->bh->b_data + bs->bh->b_size; | |
1840 | bs->s.here = bs->s.first; | |
9496005d TT |
1841 | error = xattr_find_entry(inode, &bs->s.here, bs->s.end, |
1842 | i->name_index, i->name, 1); | |
ac27a0ec | 1843 | if (error && error != -ENODATA) |
fb265c9c | 1844 | return error; |
ac27a0ec DK |
1845 | bs->s.not_found = error; |
1846 | } | |
fb265c9c | 1847 | return 0; |
ac27a0ec DK |
1848 | } |
1849 | ||
1850 | static int | |
617ba13b MC |
1851 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
1852 | struct ext4_xattr_info *i, | |
1853 | struct ext4_xattr_block_find *bs) | |
ac27a0ec DK |
1854 | { |
1855 | struct super_block *sb = inode->i_sb; | |
1856 | struct buffer_head *new_bh = NULL; | |
b347e2bc TE |
1857 | struct ext4_xattr_search s_copy = bs->s; |
1858 | struct ext4_xattr_search *s = &s_copy; | |
7a2508e1 | 1859 | struct mb_cache_entry *ce = NULL; |
8a2bfdcb | 1860 | int error = 0; |
47387409 | 1861 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
a6d05676 TE |
1862 | struct inode *ea_inode = NULL, *tmp_inode; |
1863 | size_t old_ea_inode_quota = 0; | |
1864 | unsigned int ea_ino; | |
1865 | ||
ac27a0ec | 1866 | |
617ba13b | 1867 | #define header(x) ((struct ext4_xattr_header *)(x)) |
ac27a0ec | 1868 | |
ac27a0ec | 1869 | if (s->base) { |
fd48e9ac JK |
1870 | int offset = (char *)s->here - bs->bh->b_data; |
1871 | ||
5d601255 | 1872 | BUFFER_TRACE(bs->bh, "get_write_access"); |
188c299e JK |
1873 | error = ext4_journal_get_write_access(handle, sb, bs->bh, |
1874 | EXT4_JTR_NONE); | |
8a2bfdcb MC |
1875 | if (error) |
1876 | goto cleanup; | |
1877 | lock_buffer(bs->bh); | |
1878 | ||
ac27a0ec | 1879 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
82939d79 JK |
1880 | __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
1881 | ||
1882 | /* | |
1883 | * This must happen under buffer lock for | |
1884 | * ext4_xattr_block_set() to reliably detect modified | |
1885 | * block | |
1886 | */ | |
65f8b800 JK |
1887 | if (ea_block_cache) { |
1888 | struct mb_cache_entry *oe; | |
1889 | ||
1890 | oe = mb_cache_entry_delete_or_get(ea_block_cache, | |
1891 | hash, bs->bh->b_blocknr); | |
1892 | if (oe) { | |
1893 | /* | |
1894 | * Xattr block is getting reused. Leave | |
1895 | * it alone. | |
1896 | */ | |
1897 | mb_cache_entry_put(ea_block_cache, oe); | |
1898 | goto clone_block; | |
1899 | } | |
1900 | } | |
ac27a0ec | 1901 | ea_bdebug(bs->bh, "modifying in-place"); |
daf83281 TE |
1902 | error = ext4_xattr_set_entry(i, s, handle, inode, |
1903 | true /* is_block */); | |
dac7a4b4 | 1904 | ext4_xattr_block_csum_set(inode, bs->bh); |
ac27a0ec | 1905 | unlock_buffer(bs->bh); |
6a797d27 | 1906 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1907 | goto bad_block; |
1908 | if (!error) | |
dac7a4b4 TT |
1909 | error = ext4_handle_dirty_metadata(handle, |
1910 | inode, | |
1911 | bs->bh); | |
ac27a0ec DK |
1912 | if (error) |
1913 | goto cleanup; | |
1914 | goto inserted; | |
fd48e9ac | 1915 | } |
65f8b800 | 1916 | clone_block: |
fd48e9ac JK |
1917 | unlock_buffer(bs->bh); |
1918 | ea_bdebug(bs->bh, "cloning"); | |
1919 | s->base = kmemdup(BHDR(bs->bh), bs->bh->b_size, GFP_NOFS); | |
1920 | error = -ENOMEM; | |
1921 | if (s->base == NULL) | |
1922 | goto cleanup; | |
1923 | s->first = ENTRY(header(s->base)+1); | |
1924 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1925 | s->here = ENTRY(s->base + offset); | |
1926 | s->end = s->base + bs->bh->b_size; | |
ac27a0ec | 1927 | |
fd48e9ac JK |
1928 | /* |
1929 | * If existing entry points to an xattr inode, we need | |
1930 | * to prevent ext4_xattr_set_entry() from decrementing | |
1931 | * ref count on it because the reference belongs to the | |
1932 | * original block. In this case, make the entry look | |
1933 | * like it has an empty value. | |
1934 | */ | |
1935 | if (!s->not_found && s->here->e_value_inum) { | |
1936 | ea_ino = le32_to_cpu(s->here->e_value_inum); | |
1937 | error = ext4_xattr_inode_iget(inode, ea_ino, | |
1938 | le32_to_cpu(s->here->e_hash), | |
1939 | &tmp_inode); | |
1940 | if (error) | |
ac27a0ec | 1941 | goto cleanup; |
dec214d0 | 1942 | |
fd48e9ac JK |
1943 | if (!ext4_test_inode_state(tmp_inode, |
1944 | EXT4_STATE_LUSTRE_EA_INODE)) { | |
1945 | /* | |
1946 | * Defer quota free call for previous | |
1947 | * inode until success is guaranteed. | |
1948 | */ | |
1949 | old_ea_inode_quota = le32_to_cpu( | |
1950 | s->here->e_value_size); | |
dec214d0 | 1951 | } |
fd48e9ac JK |
1952 | iput(tmp_inode); |
1953 | ||
1954 | s->here->e_value_inum = 0; | |
1955 | s->here->e_value_size = 0; | |
ac27a0ec DK |
1956 | } |
1957 | } else { | |
1958 | /* Allocate a buffer where we construct the new block. */ | |
216553c4 | 1959 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
ac27a0ec DK |
1960 | error = -ENOMEM; |
1961 | if (s->base == NULL) | |
1962 | goto cleanup; | |
617ba13b | 1963 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
ac27a0ec DK |
1964 | header(s->base)->h_blocks = cpu_to_le32(1); |
1965 | header(s->base)->h_refcount = cpu_to_le32(1); | |
1966 | s->first = ENTRY(header(s->base)+1); | |
1967 | s->here = ENTRY(header(s->base)+1); | |
1968 | s->end = s->base + sb->s_blocksize; | |
1969 | } | |
1970 | ||
daf83281 | 1971 | error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); |
6a797d27 | 1972 | if (error == -EFSCORRUPTED) |
ac27a0ec DK |
1973 | goto bad_block; |
1974 | if (error) | |
1975 | goto cleanup; | |
dec214d0 TE |
1976 | |
1977 | if (i->value && s->here->e_value_inum) { | |
dec214d0 TE |
1978 | /* |
1979 | * A ref count on ea_inode has been taken as part of the call to | |
1980 | * ext4_xattr_set_entry() above. We would like to drop this | |
1981 | * extra ref but we have to wait until the xattr block is | |
1982 | * initialized and has its own ref count on the ea_inode. | |
1983 | */ | |
1984 | ea_ino = le32_to_cpu(s->here->e_value_inum); | |
a6d05676 TE |
1985 | error = ext4_xattr_inode_iget(inode, ea_ino, |
1986 | le32_to_cpu(s->here->e_hash), | |
1987 | &ea_inode); | |
dec214d0 TE |
1988 | if (error) { |
1989 | ea_inode = NULL; | |
1990 | goto cleanup; | |
1991 | } | |
1992 | } | |
1993 | ||
ac27a0ec DK |
1994 | inserted: |
1995 | if (!IS_LAST_ENTRY(s->first)) { | |
47387409 TE |
1996 | new_bh = ext4_xattr_block_cache_find(inode, header(s->base), |
1997 | &ce); | |
ac27a0ec DK |
1998 | if (new_bh) { |
1999 | /* We found an identical block in the cache. */ | |
2000 | if (new_bh == bs->bh) | |
2001 | ea_bdebug(new_bh, "keeping"); | |
2002 | else { | |
6048c64b AG |
2003 | u32 ref; |
2004 | ||
b8cb5a54 TE |
2005 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
2006 | ||
ac27a0ec DK |
2007 | /* The old block is released after updating |
2008 | the inode. */ | |
1231b3a1 LC |
2009 | error = dquot_alloc_block(inode, |
2010 | EXT4_C2B(EXT4_SB(sb), 1)); | |
5dd4056d | 2011 | if (error) |
ac27a0ec | 2012 | goto cleanup; |
5d601255 | 2013 | BUFFER_TRACE(new_bh, "get_write_access"); |
188c299e JK |
2014 | error = ext4_journal_get_write_access( |
2015 | handle, sb, new_bh, | |
2016 | EXT4_JTR_NONE); | |
ac27a0ec DK |
2017 | if (error) |
2018 | goto cleanup_dquot; | |
2019 | lock_buffer(new_bh); | |
82939d79 JK |
2020 | /* |
2021 | * We have to be careful about races with | |
65f8b800 JK |
2022 | * adding references to xattr block. Once we |
2023 | * hold buffer lock xattr block's state is | |
2024 | * stable so we can check the additional | |
2025 | * reference fits. | |
82939d79 | 2026 | */ |
65f8b800 JK |
2027 | ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
2028 | if (ref > EXT4_XATTR_REFCOUNT_MAX) { | |
82939d79 JK |
2029 | /* |
2030 | * Undo everything and check mbcache | |
2031 | * again. | |
2032 | */ | |
2033 | unlock_buffer(new_bh); | |
2034 | dquot_free_block(inode, | |
2035 | EXT4_C2B(EXT4_SB(sb), | |
2036 | 1)); | |
2037 | brelse(new_bh); | |
47387409 | 2038 | mb_cache_entry_put(ea_block_cache, ce); |
82939d79 JK |
2039 | ce = NULL; |
2040 | new_bh = NULL; | |
2041 | goto inserted; | |
2042 | } | |
6048c64b | 2043 | BHDR(new_bh)->h_refcount = cpu_to_le32(ref); |
65f8b800 | 2044 | if (ref == EXT4_XATTR_REFCOUNT_MAX) |
6048c64b | 2045 | ce->e_reusable = 0; |
ac27a0ec | 2046 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
6048c64b | 2047 | ref); |
dac7a4b4 | 2048 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec | 2049 | unlock_buffer(new_bh); |
dac7a4b4 TT |
2050 | error = ext4_handle_dirty_metadata(handle, |
2051 | inode, | |
2052 | new_bh); | |
ac27a0ec DK |
2053 | if (error) |
2054 | goto cleanup_dquot; | |
2055 | } | |
47387409 TE |
2056 | mb_cache_entry_touch(ea_block_cache, ce); |
2057 | mb_cache_entry_put(ea_block_cache, ce); | |
ac27a0ec DK |
2058 | ce = NULL; |
2059 | } else if (bs->bh && s->base == bs->bh->b_data) { | |
2060 | /* We were modifying this block in-place. */ | |
2061 | ea_bdebug(bs->bh, "keeping this block"); | |
ec000220 | 2062 | ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); |
ac27a0ec DK |
2063 | new_bh = bs->bh; |
2064 | get_bh(new_bh); | |
2065 | } else { | |
2066 | /* We need to allocate a new block */ | |
fb0a387d ES |
2067 | ext4_fsblk_t goal, block; |
2068 | ||
b8cb5a54 TE |
2069 | WARN_ON_ONCE(dquot_initialize_needed(inode)); |
2070 | ||
fb0a387d | 2071 | goal = ext4_group_first_block_no(sb, |
d00a6d7b | 2072 | EXT4_I(inode)->i_block_group); |
fb0a387d ES |
2073 | |
2074 | /* non-extent files can't have physical blocks past 2^32 */ | |
12e9b892 | 2075 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2076 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
2077 | ||
55f020db AH |
2078 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
2079 | NULL, &error); | |
ac27a0ec DK |
2080 | if (error) |
2081 | goto cleanup; | |
fb0a387d | 2082 | |
12e9b892 | 2083 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2084 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
2085 | ||
ace36ad4 JP |
2086 | ea_idebug(inode, "creating block %llu", |
2087 | (unsigned long long)block); | |
ac27a0ec DK |
2088 | |
2089 | new_bh = sb_getblk(sb, block); | |
aebf0243 | 2090 | if (unlikely(!new_bh)) { |
860d21e2 | 2091 | error = -ENOMEM; |
ac27a0ec | 2092 | getblk_failed: |
7dc57615 | 2093 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 2094 | EXT4_FREE_BLOCKS_METADATA); |
ac27a0ec DK |
2095 | goto cleanup; |
2096 | } | |
dec214d0 TE |
2097 | error = ext4_xattr_inode_inc_ref_all(handle, inode, |
2098 | ENTRY(header(s->base)+1)); | |
2099 | if (error) | |
2100 | goto getblk_failed; | |
2101 | if (ea_inode) { | |
2102 | /* Drop the extra ref on ea_inode. */ | |
2103 | error = ext4_xattr_inode_dec_ref(handle, | |
2104 | ea_inode); | |
2105 | if (error) | |
2106 | ext4_warning_inode(ea_inode, | |
2107 | "dec ref error=%d", | |
2108 | error); | |
2109 | iput(ea_inode); | |
2110 | ea_inode = NULL; | |
2111 | } | |
2112 | ||
ac27a0ec | 2113 | lock_buffer(new_bh); |
188c299e JK |
2114 | error = ext4_journal_get_create_access(handle, sb, |
2115 | new_bh, EXT4_JTR_NONE); | |
ac27a0ec DK |
2116 | if (error) { |
2117 | unlock_buffer(new_bh); | |
860d21e2 | 2118 | error = -EIO; |
ac27a0ec DK |
2119 | goto getblk_failed; |
2120 | } | |
2121 | memcpy(new_bh->b_data, s->base, new_bh->b_size); | |
dac7a4b4 | 2122 | ext4_xattr_block_csum_set(inode, new_bh); |
ac27a0ec DK |
2123 | set_buffer_uptodate(new_bh); |
2124 | unlock_buffer(new_bh); | |
47387409 | 2125 | ext4_xattr_block_cache_insert(ea_block_cache, new_bh); |
dac7a4b4 TT |
2126 | error = ext4_handle_dirty_metadata(handle, inode, |
2127 | new_bh); | |
ac27a0ec DK |
2128 | if (error) |
2129 | goto cleanup; | |
2130 | } | |
2131 | } | |
2132 | ||
a6d05676 TE |
2133 | if (old_ea_inode_quota) |
2134 | ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); | |
dec214d0 | 2135 | |
ac27a0ec | 2136 | /* Update the inode. */ |
617ba13b | 2137 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
ac27a0ec DK |
2138 | |
2139 | /* Drop the previous xattr block. */ | |
dec214d0 TE |
2140 | if (bs->bh && bs->bh != new_bh) { |
2141 | struct ext4_xattr_inode_array *ea_inode_array = NULL; | |
2142 | ||
2143 | ext4_xattr_release_block(handle, inode, bs->bh, | |
2144 | &ea_inode_array, | |
2145 | 0 /* extra_credits */); | |
2146 | ext4_xattr_inode_array_free(ea_inode_array); | |
2147 | } | |
ac27a0ec DK |
2148 | error = 0; |
2149 | ||
2150 | cleanup: | |
dec214d0 TE |
2151 | if (ea_inode) { |
2152 | int error2; | |
2153 | ||
2154 | error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); | |
2155 | if (error2) | |
2156 | ext4_warning_inode(ea_inode, "dec ref error=%d", | |
2157 | error2); | |
2158 | ||
2159 | /* If there was an error, revert the quota charge. */ | |
2160 | if (error) | |
a6d05676 | 2161 | ext4_xattr_inode_free_quota(inode, ea_inode, |
dec214d0 TE |
2162 | i_size_read(ea_inode)); |
2163 | iput(ea_inode); | |
2164 | } | |
ac27a0ec | 2165 | if (ce) |
47387409 | 2166 | mb_cache_entry_put(ea_block_cache, ce); |
ac27a0ec DK |
2167 | brelse(new_bh); |
2168 | if (!(bs->bh && s->base == bs->bh->b_data)) | |
2169 | kfree(s->base); | |
2170 | ||
2171 | return error; | |
2172 | ||
2173 | cleanup_dquot: | |
1231b3a1 | 2174 | dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
ac27a0ec DK |
2175 | goto cleanup; |
2176 | ||
2177 | bad_block: | |
24676da4 TT |
2178 | EXT4_ERROR_INODE(inode, "bad block %llu", |
2179 | EXT4_I(inode)->i_file_acl); | |
ac27a0ec DK |
2180 | goto cleanup; |
2181 | ||
2182 | #undef header | |
2183 | } | |
2184 | ||
879b3825 TM |
2185 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
2186 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2187 | { |
617ba13b MC |
2188 | struct ext4_xattr_ibody_header *header; |
2189 | struct ext4_inode *raw_inode; | |
ac27a0ec DK |
2190 | int error; |
2191 | ||
67d7d8ad | 2192 | if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) |
ac27a0ec | 2193 | return 0; |
67d7d8ad | 2194 | |
617ba13b | 2195 | raw_inode = ext4_raw_inode(&is->iloc); |
ac27a0ec DK |
2196 | header = IHDR(inode, raw_inode); |
2197 | is->s.base = is->s.first = IFIRST(header); | |
2198 | is->s.here = is->s.first; | |
617ba13b | 2199 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
19f5fb7a | 2200 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
9e92f48c | 2201 | error = xattr_check_inode(inode, header, is->s.end); |
ac27a0ec DK |
2202 | if (error) |
2203 | return error; | |
2204 | /* Find the named attribute. */ | |
9496005d TT |
2205 | error = xattr_find_entry(inode, &is->s.here, is->s.end, |
2206 | i->name_index, i->name, 0); | |
ac27a0ec DK |
2207 | if (error && error != -ENODATA) |
2208 | return error; | |
2209 | is->s.not_found = error; | |
2210 | } | |
2211 | return 0; | |
2212 | } | |
2213 | ||
310c097c | 2214 | int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, |
0d812f77 TM |
2215 | struct ext4_xattr_info *i, |
2216 | struct ext4_xattr_ibody_find *is) | |
ac27a0ec | 2217 | { |
617ba13b MC |
2218 | struct ext4_xattr_ibody_header *header; |
2219 | struct ext4_xattr_search *s = &is->s; | |
ac27a0ec DK |
2220 | int error; |
2221 | ||
67d7d8ad | 2222 | if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) |
ac27a0ec | 2223 | return -ENOSPC; |
67d7d8ad | 2224 | |
daf83281 | 2225 | error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
ac27a0ec DK |
2226 | if (error) |
2227 | return error; | |
617ba13b | 2228 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
ac27a0ec | 2229 | if (!IS_LAST_ENTRY(s->first)) { |
617ba13b | 2230 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
19f5fb7a | 2231 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2232 | } else { |
2233 | header->h_magic = cpu_to_le32(0); | |
19f5fb7a | 2234 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
2235 | } |
2236 | return 0; | |
2237 | } | |
2238 | ||
3fd16462 JK |
2239 | static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
2240 | struct ext4_xattr_info *i) | |
2241 | { | |
2242 | void *value; | |
2243 | ||
0bd454c0 TE |
2244 | /* When e_value_inum is set the value is stored externally. */ |
2245 | if (s->here->e_value_inum) | |
2246 | return 0; | |
3fd16462 JK |
2247 | if (le32_to_cpu(s->here->e_value_size) != i->value_len) |
2248 | return 0; | |
2249 | value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); | |
2250 | return !memcmp(value, i->value, i->value_len); | |
2251 | } | |
2252 | ||
dec214d0 TE |
2253 | static struct buffer_head *ext4_xattr_get_block(struct inode *inode) |
2254 | { | |
2255 | struct buffer_head *bh; | |
2256 | int error; | |
2257 | ||
2258 | if (!EXT4_I(inode)->i_file_acl) | |
2259 | return NULL; | |
fb265c9c TT |
2260 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2261 | if (IS_ERR(bh)) | |
2262 | return bh; | |
dec214d0 | 2263 | error = ext4_xattr_check_block(inode, bh); |
ecaaf408 VA |
2264 | if (error) { |
2265 | brelse(bh); | |
dec214d0 | 2266 | return ERR_PTR(error); |
ecaaf408 | 2267 | } |
dec214d0 TE |
2268 | return bh; |
2269 | } | |
2270 | ||
ac27a0ec | 2271 | /* |
617ba13b | 2272 | * ext4_xattr_set_handle() |
ac27a0ec | 2273 | * |
6e9510b0 | 2274 | * Create, replace or remove an extended attribute for this inode. Value |
ac27a0ec DK |
2275 | * is NULL to remove an existing extended attribute, and non-NULL to |
2276 | * either replace an existing extended attribute, or create a new extended | |
2277 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE | |
2278 | * specify that an extended attribute must exist and must not exist | |
2279 | * previous to the call, respectively. | |
2280 | * | |
2281 | * Returns 0, or a negative error number on failure. | |
2282 | */ | |
2283 | int | |
617ba13b | 2284 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
ac27a0ec DK |
2285 | const char *name, const void *value, size_t value_len, |
2286 | int flags) | |
2287 | { | |
617ba13b | 2288 | struct ext4_xattr_info i = { |
ac27a0ec DK |
2289 | .name_index = name_index, |
2290 | .name = name, | |
2291 | .value = value, | |
2292 | .value_len = value_len, | |
e50e5129 | 2293 | .in_inode = 0, |
ac27a0ec | 2294 | }; |
617ba13b | 2295 | struct ext4_xattr_ibody_find is = { |
ac27a0ec DK |
2296 | .s = { .not_found = -ENODATA, }, |
2297 | }; | |
617ba13b | 2298 | struct ext4_xattr_block_find bs = { |
ac27a0ec DK |
2299 | .s = { .not_found = -ENODATA, }, |
2300 | }; | |
c755e251 | 2301 | int no_expand; |
ac27a0ec DK |
2302 | int error; |
2303 | ||
2304 | if (!name) | |
2305 | return -EINVAL; | |
2306 | if (strlen(name) > 255) | |
2307 | return -ERANGE; | |
b8cb5a54 | 2308 | |
c755e251 | 2309 | ext4_write_lock_xattr(inode, &no_expand); |
4d20c685 | 2310 | |
c1a5d5f6 TE |
2311 | /* Check journal credits under write lock. */ |
2312 | if (ext4_handle_valid(handle)) { | |
dec214d0 | 2313 | struct buffer_head *bh; |
c1a5d5f6 TE |
2314 | int credits; |
2315 | ||
dec214d0 TE |
2316 | bh = ext4_xattr_get_block(inode); |
2317 | if (IS_ERR(bh)) { | |
2318 | error = PTR_ERR(bh); | |
2319 | goto cleanup; | |
2320 | } | |
2321 | ||
af65207c TE |
2322 | credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2323 | value_len, | |
2324 | flags & XATTR_CREATE); | |
dec214d0 TE |
2325 | brelse(bh); |
2326 | ||
a9a8344e | 2327 | if (jbd2_handle_buffer_credits(handle) < credits) { |
c1a5d5f6 TE |
2328 | error = -ENOSPC; |
2329 | goto cleanup; | |
2330 | } | |
163f0ec1 | 2331 | WARN_ON_ONCE(!(current->flags & PF_MEMALLOC_NOFS)); |
c1a5d5f6 TE |
2332 | } |
2333 | ||
66543617 | 2334 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
86ebfd08 ES |
2335 | if (error) |
2336 | goto cleanup; | |
2337 | ||
19f5fb7a | 2338 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
617ba13b MC |
2339 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
2340 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); | |
19f5fb7a | 2341 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec DK |
2342 | } |
2343 | ||
617ba13b | 2344 | error = ext4_xattr_ibody_find(inode, &i, &is); |
ac27a0ec DK |
2345 | if (error) |
2346 | goto cleanup; | |
2347 | if (is.s.not_found) | |
617ba13b | 2348 | error = ext4_xattr_block_find(inode, &i, &bs); |
ac27a0ec DK |
2349 | if (error) |
2350 | goto cleanup; | |
2351 | if (is.s.not_found && bs.s.not_found) { | |
2352 | error = -ENODATA; | |
2353 | if (flags & XATTR_REPLACE) | |
2354 | goto cleanup; | |
2355 | error = 0; | |
2356 | if (!value) | |
2357 | goto cleanup; | |
2358 | } else { | |
2359 | error = -EEXIST; | |
2360 | if (flags & XATTR_CREATE) | |
2361 | goto cleanup; | |
2362 | } | |
dec214d0 | 2363 | |
ac27a0ec DK |
2364 | if (!value) { |
2365 | if (!is.s.not_found) | |
e50e5129 | 2366 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec | 2367 | else if (!bs.s.not_found) |
617ba13b | 2368 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2369 | } else { |
3fd16462 JK |
2370 | error = 0; |
2371 | /* Xattr value did not change? Save us some work and bail out */ | |
2372 | if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) | |
2373 | goto cleanup; | |
2374 | if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) | |
2375 | goto cleanup; | |
2376 | ||
b347e2bc TE |
2377 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2378 | (EXT4_XATTR_SIZE(i.value_len) > | |
2379 | EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) | |
2380 | i.in_inode = 1; | |
2381 | retry_inode: | |
e50e5129 | 2382 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
ac27a0ec DK |
2383 | if (!error && !bs.s.not_found) { |
2384 | i.value = NULL; | |
617ba13b | 2385 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
ac27a0ec | 2386 | } else if (error == -ENOSPC) { |
7e01c8e5 | 2387 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
45ae932d VA |
2388 | brelse(bs.bh); |
2389 | bs.bh = NULL; | |
7e01c8e5 TY |
2390 | error = ext4_xattr_block_find(inode, &i, &bs); |
2391 | if (error) | |
2392 | goto cleanup; | |
2393 | } | |
617ba13b | 2394 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
b347e2bc | 2395 | if (!error && !is.s.not_found) { |
ac27a0ec | 2396 | i.value = NULL; |
e50e5129 AD |
2397 | error = ext4_xattr_ibody_set(handle, inode, &i, |
2398 | &is); | |
b347e2bc TE |
2399 | } else if (error == -ENOSPC) { |
2400 | /* | |
2401 | * Xattr does not fit in the block, store at | |
2402 | * external inode if possible. | |
2403 | */ | |
2404 | if (ext4_has_feature_ea_inode(inode->i_sb) && | |
6b224899 | 2405 | i.value_len && !i.in_inode) { |
b347e2bc TE |
2406 | i.in_inode = 1; |
2407 | goto retry_inode; | |
2408 | } | |
ac27a0ec DK |
2409 | } |
2410 | } | |
2411 | } | |
2412 | if (!error) { | |
617ba13b | 2413 | ext4_xattr_update_super_block(handle, inode->i_sb); |
eeca7ea1 | 2414 | inode->i_ctime = current_time(inode); |
6dd4ee7c | 2415 | if (!value) |
c755e251 | 2416 | no_expand = 0; |
617ba13b | 2417 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
ac27a0ec | 2418 | /* |
617ba13b | 2419 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
ac27a0ec DK |
2420 | * error != 0. |
2421 | */ | |
2422 | is.iloc.bh = NULL; | |
2423 | if (IS_SYNC(inode)) | |
0390131b | 2424 | ext4_handle_sync(handle); |
ac27a0ec | 2425 | } |
e85c81ba | 2426 | ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); |
ac27a0ec DK |
2427 | |
2428 | cleanup: | |
2429 | brelse(is.iloc.bh); | |
2430 | brelse(bs.bh); | |
c755e251 | 2431 | ext4_write_unlock_xattr(inode, &no_expand); |
ac27a0ec DK |
2432 | return error; |
2433 | } | |
2434 | ||
af65207c TE |
2435 | int ext4_xattr_set_credits(struct inode *inode, size_t value_len, |
2436 | bool is_create, int *credits) | |
c1a5d5f6 | 2437 | { |
dec214d0 TE |
2438 | struct buffer_head *bh; |
2439 | int err; | |
c1a5d5f6 | 2440 | |
dec214d0 | 2441 | *credits = 0; |
c1a5d5f6 | 2442 | |
dec214d0 TE |
2443 | if (!EXT4_SB(inode->i_sb)->s_journal) |
2444 | return 0; | |
c1a5d5f6 | 2445 | |
dec214d0 | 2446 | down_read(&EXT4_I(inode)->xattr_sem); |
c1a5d5f6 | 2447 | |
dec214d0 TE |
2448 | bh = ext4_xattr_get_block(inode); |
2449 | if (IS_ERR(bh)) { | |
2450 | err = PTR_ERR(bh); | |
2451 | } else { | |
af65207c TE |
2452 | *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
2453 | value_len, is_create); | |
dec214d0 TE |
2454 | brelse(bh); |
2455 | err = 0; | |
c1a5d5f6 | 2456 | } |
dec214d0 TE |
2457 | |
2458 | up_read(&EXT4_I(inode)->xattr_sem); | |
2459 | return err; | |
c1a5d5f6 TE |
2460 | } |
2461 | ||
ac27a0ec | 2462 | /* |
617ba13b | 2463 | * ext4_xattr_set() |
ac27a0ec | 2464 | * |
617ba13b | 2465 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
ac27a0ec DK |
2466 | * attribute modification is a filesystem transaction by itself. |
2467 | * | |
2468 | * Returns 0, or a negative error number on failure. | |
2469 | */ | |
2470 | int | |
617ba13b | 2471 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
ac27a0ec DK |
2472 | const void *value, size_t value_len, int flags) |
2473 | { | |
2474 | handle_t *handle; | |
e50e5129 | 2475 | struct super_block *sb = inode->i_sb; |
ac27a0ec | 2476 | int error, retries = 0; |
c1a5d5f6 | 2477 | int credits; |
ac27a0ec | 2478 | |
b8cb5a54 TE |
2479 | error = dquot_initialize(inode); |
2480 | if (error) | |
2481 | return error; | |
e50e5129 | 2482 | |
ac27a0ec | 2483 | retry: |
af65207c TE |
2484 | error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, |
2485 | &credits); | |
dec214d0 TE |
2486 | if (error) |
2487 | return error; | |
2488 | ||
9924a92a | 2489 | handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
ac27a0ec DK |
2490 | if (IS_ERR(handle)) { |
2491 | error = PTR_ERR(handle); | |
2492 | } else { | |
2493 | int error2; | |
2494 | ||
617ba13b | 2495 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
ac27a0ec | 2496 | value, value_len, flags); |
617ba13b | 2497 | error2 = ext4_journal_stop(handle); |
ac27a0ec | 2498 | if (error == -ENOSPC && |
e50e5129 | 2499 | ext4_should_retry_alloc(sb, &retries)) |
ac27a0ec DK |
2500 | goto retry; |
2501 | if (error == 0) | |
2502 | error = error2; | |
2503 | } | |
e85c81ba | 2504 | ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, NULL); |
ac27a0ec DK |
2505 | |
2506 | return error; | |
2507 | } | |
2508 | ||
6dd4ee7c KS |
2509 | /* |
2510 | * Shift the EA entries in the inode to create space for the increased | |
2511 | * i_extra_isize. | |
2512 | */ | |
2513 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, | |
2514 | int value_offs_shift, void *to, | |
94405713 | 2515 | void *from, size_t n) |
6dd4ee7c KS |
2516 | { |
2517 | struct ext4_xattr_entry *last = entry; | |
2518 | int new_offs; | |
2519 | ||
94405713 JK |
2520 | /* We always shift xattr headers further thus offsets get lower */ |
2521 | BUG_ON(value_offs_shift > 0); | |
2522 | ||
6dd4ee7c KS |
2523 | /* Adjust the value offsets of the entries */ |
2524 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
e50e5129 | 2525 | if (!last->e_value_inum && last->e_value_size) { |
6dd4ee7c KS |
2526 | new_offs = le16_to_cpu(last->e_value_offs) + |
2527 | value_offs_shift; | |
6dd4ee7c KS |
2528 | last->e_value_offs = cpu_to_le16(new_offs); |
2529 | } | |
2530 | } | |
2531 | /* Shift the entries by n bytes */ | |
2532 | memmove(to, from, n); | |
2533 | } | |
2534 | ||
3f2571c1 JK |
2535 | /* |
2536 | * Move xattr pointed to by 'entry' from inode into external xattr block | |
2537 | */ | |
2538 | static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, | |
2539 | struct ext4_inode *raw_inode, | |
2540 | struct ext4_xattr_entry *entry) | |
2541 | { | |
2542 | struct ext4_xattr_ibody_find *is = NULL; | |
2543 | struct ext4_xattr_block_find *bs = NULL; | |
2544 | char *buffer = NULL, *b_entry_name = NULL; | |
f6109100 | 2545 | size_t value_size = le32_to_cpu(entry->e_value_size); |
3f2571c1 JK |
2546 | struct ext4_xattr_info i = { |
2547 | .value = NULL, | |
2548 | .value_len = 0, | |
2549 | .name_index = entry->e_name_index, | |
f6109100 | 2550 | .in_inode = !!entry->e_value_inum, |
3f2571c1 JK |
2551 | }; |
2552 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2553 | int error; | |
2554 | ||
3f2571c1 JK |
2555 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); |
2556 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); | |
2557 | buffer = kmalloc(value_size, GFP_NOFS); | |
2558 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); | |
2559 | if (!is || !bs || !buffer || !b_entry_name) { | |
2560 | error = -ENOMEM; | |
2561 | goto out; | |
2562 | } | |
2563 | ||
2564 | is->s.not_found = -ENODATA; | |
2565 | bs->s.not_found = -ENODATA; | |
2566 | is->iloc.bh = NULL; | |
2567 | bs->bh = NULL; | |
2568 | ||
2569 | /* Save the entry name and the entry value */ | |
f6109100 | 2570 | if (entry->e_value_inum) { |
b9fc761e | 2571 | error = ext4_xattr_inode_get(inode, entry, buffer, value_size); |
f6109100 TE |
2572 | if (error) |
2573 | goto out; | |
2574 | } else { | |
2575 | size_t value_offs = le16_to_cpu(entry->e_value_offs); | |
2576 | memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); | |
2577 | } | |
2578 | ||
3f2571c1 JK |
2579 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); |
2580 | b_entry_name[entry->e_name_len] = '\0'; | |
2581 | i.name = b_entry_name; | |
2582 | ||
2583 | error = ext4_get_inode_loc(inode, &is->iloc); | |
2584 | if (error) | |
2585 | goto out; | |
2586 | ||
2587 | error = ext4_xattr_ibody_find(inode, &i, is); | |
2588 | if (error) | |
2589 | goto out; | |
2590 | ||
2591 | /* Remove the chosen entry from the inode */ | |
e50e5129 | 2592 | error = ext4_xattr_ibody_set(handle, inode, &i, is); |
3f2571c1 JK |
2593 | if (error) |
2594 | goto out; | |
2595 | ||
3f2571c1 JK |
2596 | i.value = buffer; |
2597 | i.value_len = value_size; | |
2598 | error = ext4_xattr_block_find(inode, &i, bs); | |
2599 | if (error) | |
2600 | goto out; | |
2601 | ||
2602 | /* Add entry which was removed from the inode into the block */ | |
2603 | error = ext4_xattr_block_set(handle, inode, &i, bs); | |
2604 | if (error) | |
2605 | goto out; | |
2606 | error = 0; | |
2607 | out: | |
2608 | kfree(b_entry_name); | |
2609 | kfree(buffer); | |
2610 | if (is) | |
2611 | brelse(is->iloc.bh); | |
6bdc9977 VA |
2612 | if (bs) |
2613 | brelse(bs->bh); | |
3f2571c1 JK |
2614 | kfree(is); |
2615 | kfree(bs); | |
2616 | ||
2617 | return error; | |
2618 | } | |
2619 | ||
dfa2064b JK |
2620 | static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, |
2621 | struct ext4_inode *raw_inode, | |
2622 | int isize_diff, size_t ifree, | |
2623 | size_t bfree, int *total_ino) | |
2624 | { | |
2625 | struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); | |
2626 | struct ext4_xattr_entry *small_entry; | |
2627 | struct ext4_xattr_entry *entry; | |
2628 | struct ext4_xattr_entry *last; | |
2629 | unsigned int entry_size; /* EA entry size */ | |
2630 | unsigned int total_size; /* EA entry size + value size */ | |
2631 | unsigned int min_total_size; | |
2632 | int error; | |
2633 | ||
2634 | while (isize_diff > ifree) { | |
2635 | entry = NULL; | |
2636 | small_entry = NULL; | |
2637 | min_total_size = ~0U; | |
2638 | last = IFIRST(header); | |
2639 | /* Find the entry best suited to be pushed into EA block */ | |
2640 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { | |
8cdb5240 TT |
2641 | /* never move system.data out of the inode */ |
2642 | if ((last->e_name_len == 4) && | |
2643 | (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) && | |
2644 | !memcmp(last->e_name, "data", 4)) | |
2645 | continue; | |
9bb21ced TE |
2646 | total_size = EXT4_XATTR_LEN(last->e_name_len); |
2647 | if (!last->e_value_inum) | |
2648 | total_size += EXT4_XATTR_SIZE( | |
2649 | le32_to_cpu(last->e_value_size)); | |
dfa2064b JK |
2650 | if (total_size <= bfree && |
2651 | total_size < min_total_size) { | |
2652 | if (total_size + ifree < isize_diff) { | |
2653 | small_entry = last; | |
2654 | } else { | |
2655 | entry = last; | |
2656 | min_total_size = total_size; | |
2657 | } | |
2658 | } | |
2659 | } | |
2660 | ||
2661 | if (entry == NULL) { | |
2662 | if (small_entry == NULL) | |
2663 | return -ENOSPC; | |
2664 | entry = small_entry; | |
2665 | } | |
2666 | ||
2667 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); | |
9bb21ced TE |
2668 | total_size = entry_size; |
2669 | if (!entry->e_value_inum) | |
2670 | total_size += EXT4_XATTR_SIZE( | |
2671 | le32_to_cpu(entry->e_value_size)); | |
dfa2064b JK |
2672 | error = ext4_xattr_move_to_block(handle, inode, raw_inode, |
2673 | entry); | |
2674 | if (error) | |
2675 | return error; | |
2676 | ||
2677 | *total_ino -= entry_size; | |
2678 | ifree += total_size; | |
2679 | bfree -= total_size; | |
2680 | } | |
2681 | ||
2682 | return 0; | |
2683 | } | |
2684 | ||
6dd4ee7c KS |
2685 | /* |
2686 | * Expand an inode by new_extra_isize bytes when EAs are present. | |
2687 | * Returns 0 on success or negative error number on failure. | |
2688 | */ | |
2689 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, | |
2690 | struct ext4_inode *raw_inode, handle_t *handle) | |
2691 | { | |
2692 | struct ext4_xattr_ibody_header *header; | |
cf0a5e81 MX |
2693 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
2694 | static unsigned int mnt_count; | |
e3014d14 JK |
2695 | size_t min_offs; |
2696 | size_t ifree, bfree; | |
7b1b2c1b | 2697 | int total_ino; |
6e0cd088 | 2698 | void *base, *end; |
d0141191 | 2699 | int error = 0, tried_min_extra_isize = 0; |
cf0a5e81 | 2700 | int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); |
d0141191 | 2701 | int isize_diff; /* How much do we need to grow i_extra_isize */ |
6dd4ee7c | 2702 | |
6dd4ee7c | 2703 | retry: |
d0141191 | 2704 | isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; |
2e81a4ee | 2705 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) |
b640b2c5 | 2706 | return 0; |
6dd4ee7c KS |
2707 | |
2708 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
2709 | |
2710 | /* | |
2711 | * Check if enough free space is available in the inode to shift the | |
2712 | * entries ahead by new_extra_isize. | |
2713 | */ | |
2714 | ||
6e0cd088 | 2715 | base = IFIRST(header); |
6dd4ee7c KS |
2716 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
2717 | min_offs = end - base; | |
a805622a | 2718 | total_ino = sizeof(struct ext4_xattr_ibody_header) + sizeof(u32); |
6dd4ee7c | 2719 | |
9e92f48c TT |
2720 | error = xattr_check_inode(inode, header, end); |
2721 | if (error) | |
2722 | goto cleanup; | |
2723 | ||
6e0cd088 | 2724 | ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); |
e3014d14 JK |
2725 | if (ifree >= isize_diff) |
2726 | goto shift; | |
6dd4ee7c KS |
2727 | |
2728 | /* | |
2729 | * Enough free space isn't available in the inode, check if | |
2730 | * EA block can hold new_extra_isize bytes. | |
2731 | */ | |
2732 | if (EXT4_I(inode)->i_file_acl) { | |
53692ec0 VA |
2733 | struct buffer_head *bh; |
2734 | ||
fb265c9c TT |
2735 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2736 | if (IS_ERR(bh)) { | |
2737 | error = PTR_ERR(bh); | |
6dd4ee7c | 2738 | goto cleanup; |
fb265c9c | 2739 | } |
de05ca85 | 2740 | error = ext4_xattr_check_block(inode, bh); |
53692ec0 VA |
2741 | if (error) { |
2742 | brelse(bh); | |
6dd4ee7c | 2743 | goto cleanup; |
53692ec0 | 2744 | } |
6dd4ee7c | 2745 | base = BHDR(bh); |
6dd4ee7c KS |
2746 | end = bh->b_data + bh->b_size; |
2747 | min_offs = end - base; | |
6e0cd088 JK |
2748 | bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, |
2749 | NULL); | |
b640b2c5 | 2750 | brelse(bh); |
e3014d14 | 2751 | if (bfree + ifree < isize_diff) { |
6dd4ee7c KS |
2752 | if (!tried_min_extra_isize && s_min_extra_isize) { |
2753 | tried_min_extra_isize++; | |
2754 | new_extra_isize = s_min_extra_isize; | |
6dd4ee7c KS |
2755 | goto retry; |
2756 | } | |
dfa2064b | 2757 | error = -ENOSPC; |
6dd4ee7c KS |
2758 | goto cleanup; |
2759 | } | |
2760 | } else { | |
e3014d14 | 2761 | bfree = inode->i_sb->s_blocksize; |
6dd4ee7c KS |
2762 | } |
2763 | ||
dfa2064b JK |
2764 | error = ext4_xattr_make_inode_space(handle, inode, raw_inode, |
2765 | isize_diff, ifree, bfree, | |
2766 | &total_ino); | |
2767 | if (error) { | |
2768 | if (error == -ENOSPC && !tried_min_extra_isize && | |
2769 | s_min_extra_isize) { | |
2770 | tried_min_extra_isize++; | |
2771 | new_extra_isize = s_min_extra_isize; | |
dfa2064b | 2772 | goto retry; |
6dd4ee7c | 2773 | } |
dfa2064b | 2774 | goto cleanup; |
6dd4ee7c | 2775 | } |
e3014d14 JK |
2776 | shift: |
2777 | /* Adjust the offsets and shift the remaining entries ahead */ | |
6e0cd088 | 2778 | ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize |
e3014d14 JK |
2779 | - new_extra_isize, (void *)raw_inode + |
2780 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, | |
94405713 | 2781 | (void *)header, total_ino); |
e3014d14 | 2782 | EXT4_I(inode)->i_extra_isize = new_extra_isize; |
6dd4ee7c KS |
2783 | |
2784 | cleanup: | |
b640b2c5 | 2785 | if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { |
cf0a5e81 MX |
2786 | ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", |
2787 | inode->i_ino); | |
2788 | mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); | |
2789 | } | |
6dd4ee7c KS |
2790 | return error; |
2791 | } | |
2792 | ||
e50e5129 AD |
2793 | #define EIA_INCR 16 /* must be 2^n */ |
2794 | #define EIA_MASK (EIA_INCR - 1) | |
dec214d0 TE |
2795 | |
2796 | /* Add the large xattr @inode into @ea_inode_array for deferred iput(). | |
0421a189 | 2797 | * If @ea_inode_array is new or full it will be grown and the old |
e50e5129 AD |
2798 | * contents copied over. |
2799 | */ | |
2800 | static int | |
0421a189 TE |
2801 | ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, |
2802 | struct inode *inode) | |
e50e5129 | 2803 | { |
0421a189 | 2804 | if (*ea_inode_array == NULL) { |
e50e5129 AD |
2805 | /* |
2806 | * Start with 15 inodes, so it fits into a power-of-two size. | |
0421a189 | 2807 | * If *ea_inode_array is NULL, this is essentially offsetof() |
e50e5129 | 2808 | */ |
0421a189 TE |
2809 | (*ea_inode_array) = |
2810 | kmalloc(offsetof(struct ext4_xattr_inode_array, | |
2811 | inodes[EIA_MASK]), | |
e50e5129 | 2812 | GFP_NOFS); |
0421a189 | 2813 | if (*ea_inode_array == NULL) |
e50e5129 | 2814 | return -ENOMEM; |
0421a189 TE |
2815 | (*ea_inode_array)->count = 0; |
2816 | } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { | |
e50e5129 | 2817 | /* expand the array once all 15 + n * 16 slots are full */ |
0421a189 TE |
2818 | struct ext4_xattr_inode_array *new_array = NULL; |
2819 | int count = (*ea_inode_array)->count; | |
e50e5129 AD |
2820 | |
2821 | /* if new_array is NULL, this is essentially offsetof() */ | |
2822 | new_array = kmalloc( | |
0421a189 TE |
2823 | offsetof(struct ext4_xattr_inode_array, |
2824 | inodes[count + EIA_INCR]), | |
e50e5129 AD |
2825 | GFP_NOFS); |
2826 | if (new_array == NULL) | |
2827 | return -ENOMEM; | |
0421a189 TE |
2828 | memcpy(new_array, *ea_inode_array, |
2829 | offsetof(struct ext4_xattr_inode_array, inodes[count])); | |
2830 | kfree(*ea_inode_array); | |
2831 | *ea_inode_array = new_array; | |
e50e5129 | 2832 | } |
0421a189 | 2833 | (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; |
e50e5129 AD |
2834 | return 0; |
2835 | } | |
2836 | ||
ac27a0ec | 2837 | /* |
617ba13b | 2838 | * ext4_xattr_delete_inode() |
ac27a0ec | 2839 | * |
e50e5129 | 2840 | * Free extended attribute resources associated with this inode. Traverse |
dec214d0 TE |
2841 | * all entries and decrement reference on any xattr inodes associated with this |
2842 | * inode. This is called immediately before an inode is freed. We have exclusive | |
2843 | * access to the inode. If an orphan inode is deleted it will also release its | |
2844 | * references on xattr block and xattr inodes. | |
ac27a0ec | 2845 | */ |
dec214d0 TE |
2846 | int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, |
2847 | struct ext4_xattr_inode_array **ea_inode_array, | |
2848 | int extra_credits) | |
ac27a0ec DK |
2849 | { |
2850 | struct buffer_head *bh = NULL; | |
e50e5129 | 2851 | struct ext4_xattr_ibody_header *header; |
30a7eb97 | 2852 | struct ext4_iloc iloc = { .bh = NULL }; |
dec214d0 | 2853 | struct ext4_xattr_entry *entry; |
a6d05676 | 2854 | struct inode *ea_inode; |
30a7eb97 TE |
2855 | int error; |
2856 | ||
83448bdf JK |
2857 | error = ext4_journal_ensure_credits(handle, extra_credits, |
2858 | ext4_free_metadata_revoke_credits(inode->i_sb, 1)); | |
a4130367 | 2859 | if (error < 0) { |
30a7eb97 TE |
2860 | EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); |
2861 | goto cleanup; | |
2862 | } | |
ac27a0ec | 2863 | |
dec214d0 TE |
2864 | if (ext4_has_feature_ea_inode(inode->i_sb) && |
2865 | ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { | |
e50e5129 | 2866 | |
dec214d0 TE |
2867 | error = ext4_get_inode_loc(inode, &iloc); |
2868 | if (error) { | |
2869 | EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); | |
2870 | goto cleanup; | |
2871 | } | |
30a7eb97 | 2872 | |
188c299e JK |
2873 | error = ext4_journal_get_write_access(handle, inode->i_sb, |
2874 | iloc.bh, EXT4_JTR_NONE); | |
dec214d0 TE |
2875 | if (error) { |
2876 | EXT4_ERROR_INODE(inode, "write access (error %d)", | |
2877 | error); | |
2878 | goto cleanup; | |
2879 | } | |
e50e5129 | 2880 | |
dec214d0 TE |
2881 | header = IHDR(inode, ext4_raw_inode(&iloc)); |
2882 | if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) | |
2883 | ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, | |
2884 | IFIRST(header), | |
2885 | false /* block_csum */, | |
2886 | ea_inode_array, | |
2887 | extra_credits, | |
2888 | false /* skip_quota */); | |
ac27a0ec | 2889 | } |
e50e5129 | 2890 | |
dec214d0 | 2891 | if (EXT4_I(inode)->i_file_acl) { |
fb265c9c TT |
2892 | bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
2893 | if (IS_ERR(bh)) { | |
2894 | error = PTR_ERR(bh); | |
878520ac | 2895 | if (error == -EIO) { |
54d3adbc TT |
2896 | EXT4_ERROR_INODE_ERR(inode, EIO, |
2897 | "block %llu read error", | |
2898 | EXT4_I(inode)->i_file_acl); | |
878520ac | 2899 | } |
7159a986 | 2900 | bh = NULL; |
dec214d0 TE |
2901 | goto cleanup; |
2902 | } | |
2903 | error = ext4_xattr_check_block(inode, bh); | |
de05ca85 | 2904 | if (error) |
e50e5129 | 2905 | goto cleanup; |
e50e5129 | 2906 | |
dec214d0 TE |
2907 | if (ext4_has_feature_ea_inode(inode->i_sb)) { |
2908 | for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); | |
a6d05676 TE |
2909 | entry = EXT4_XATTR_NEXT(entry)) { |
2910 | if (!entry->e_value_inum) | |
2911 | continue; | |
2912 | error = ext4_xattr_inode_iget(inode, | |
2913 | le32_to_cpu(entry->e_value_inum), | |
2914 | le32_to_cpu(entry->e_hash), | |
2915 | &ea_inode); | |
2916 | if (error) | |
2917 | continue; | |
2918 | ext4_xattr_inode_free_quota(inode, ea_inode, | |
dec214d0 | 2919 | le32_to_cpu(entry->e_value_size)); |
a6d05676 TE |
2920 | iput(ea_inode); |
2921 | } | |
dec214d0 TE |
2922 | |
2923 | } | |
2924 | ||
2925 | ext4_xattr_release_block(handle, inode, bh, ea_inode_array, | |
2926 | extra_credits); | |
2927 | /* | |
2928 | * Update i_file_acl value in the same transaction that releases | |
2929 | * block. | |
2930 | */ | |
2931 | EXT4_I(inode)->i_file_acl = 0; | |
2932 | error = ext4_mark_inode_dirty(handle, inode); | |
2933 | if (error) { | |
2934 | EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", | |
2935 | error); | |
2936 | goto cleanup; | |
2937 | } | |
e85c81ba | 2938 | ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); |
30a7eb97 | 2939 | } |
dec214d0 | 2940 | error = 0; |
ac27a0ec | 2941 | cleanup: |
30a7eb97 | 2942 | brelse(iloc.bh); |
ac27a0ec | 2943 | brelse(bh); |
e50e5129 AD |
2944 | return error; |
2945 | } | |
2946 | ||
0421a189 | 2947 | void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) |
e50e5129 | 2948 | { |
dec214d0 | 2949 | int idx; |
e50e5129 | 2950 | |
0421a189 | 2951 | if (ea_inode_array == NULL) |
e50e5129 AD |
2952 | return; |
2953 | ||
dec214d0 TE |
2954 | for (idx = 0; idx < ea_inode_array->count; ++idx) |
2955 | iput(ea_inode_array->inodes[idx]); | |
0421a189 | 2956 | kfree(ea_inode_array); |
ac27a0ec DK |
2957 | } |
2958 | ||
ac27a0ec | 2959 | /* |
47387409 | 2960 | * ext4_xattr_block_cache_insert() |
ac27a0ec | 2961 | * |
47387409 | 2962 | * Create a new entry in the extended attribute block cache, and insert |
ac27a0ec DK |
2963 | * it unless such an entry is already in the cache. |
2964 | * | |
2965 | * Returns 0, or a negative error number on failure. | |
2966 | */ | |
2967 | static void | |
47387409 TE |
2968 | ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, |
2969 | struct buffer_head *bh) | |
ac27a0ec | 2970 | { |
6048c64b AG |
2971 | struct ext4_xattr_header *header = BHDR(bh); |
2972 | __u32 hash = le32_to_cpu(header->h_hash); | |
2973 | int reusable = le32_to_cpu(header->h_refcount) < | |
2974 | EXT4_XATTR_REFCOUNT_MAX; | |
ac27a0ec DK |
2975 | int error; |
2976 | ||
cdb7ee4c TE |
2977 | if (!ea_block_cache) |
2978 | return; | |
47387409 | 2979 | error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, |
6048c64b | 2980 | bh->b_blocknr, reusable); |
ac27a0ec | 2981 | if (error) { |
82939d79 | 2982 | if (error == -EBUSY) |
ac27a0ec | 2983 | ea_bdebug(bh, "already in cache"); |
82939d79 | 2984 | } else |
ac27a0ec | 2985 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
ac27a0ec DK |
2986 | } |
2987 | ||
2988 | /* | |
617ba13b | 2989 | * ext4_xattr_cmp() |
ac27a0ec DK |
2990 | * |
2991 | * Compare two extended attribute blocks for equality. | |
2992 | * | |
2993 | * Returns 0 if the blocks are equal, 1 if they differ, and | |
2994 | * a negative error number on errors. | |
2995 | */ | |
2996 | static int | |
617ba13b MC |
2997 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
2998 | struct ext4_xattr_header *header2) | |
ac27a0ec | 2999 | { |
617ba13b | 3000 | struct ext4_xattr_entry *entry1, *entry2; |
ac27a0ec DK |
3001 | |
3002 | entry1 = ENTRY(header1+1); | |
3003 | entry2 = ENTRY(header2+1); | |
3004 | while (!IS_LAST_ENTRY(entry1)) { | |
3005 | if (IS_LAST_ENTRY(entry2)) | |
3006 | return 1; | |
3007 | if (entry1->e_hash != entry2->e_hash || | |
3008 | entry1->e_name_index != entry2->e_name_index || | |
3009 | entry1->e_name_len != entry2->e_name_len || | |
3010 | entry1->e_value_size != entry2->e_value_size || | |
e50e5129 | 3011 | entry1->e_value_inum != entry2->e_value_inum || |
ac27a0ec DK |
3012 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) |
3013 | return 1; | |
7cec1918 TE |
3014 | if (!entry1->e_value_inum && |
3015 | memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), | |
ac27a0ec DK |
3016 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), |
3017 | le32_to_cpu(entry1->e_value_size))) | |
3018 | return 1; | |
3019 | ||
617ba13b MC |
3020 | entry1 = EXT4_XATTR_NEXT(entry1); |
3021 | entry2 = EXT4_XATTR_NEXT(entry2); | |
ac27a0ec DK |
3022 | } |
3023 | if (!IS_LAST_ENTRY(entry2)) | |
3024 | return 1; | |
3025 | return 0; | |
3026 | } | |
3027 | ||
3028 | /* | |
47387409 | 3029 | * ext4_xattr_block_cache_find() |
ac27a0ec DK |
3030 | * |
3031 | * Find an identical extended attribute block. | |
3032 | * | |
3033 | * Returns a pointer to the block found, or NULL if such a block was | |
3034 | * not found or an error occurred. | |
3035 | */ | |
3036 | static struct buffer_head * | |
47387409 TE |
3037 | ext4_xattr_block_cache_find(struct inode *inode, |
3038 | struct ext4_xattr_header *header, | |
3039 | struct mb_cache_entry **pce) | |
ac27a0ec DK |
3040 | { |
3041 | __u32 hash = le32_to_cpu(header->h_hash); | |
7a2508e1 | 3042 | struct mb_cache_entry *ce; |
47387409 | 3043 | struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
ac27a0ec | 3044 | |
cdb7ee4c TE |
3045 | if (!ea_block_cache) |
3046 | return NULL; | |
ac27a0ec DK |
3047 | if (!header->h_hash) |
3048 | return NULL; /* never share */ | |
3049 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); | |
47387409 | 3050 | ce = mb_cache_entry_find_first(ea_block_cache, hash); |
ac27a0ec DK |
3051 | while (ce) { |
3052 | struct buffer_head *bh; | |
3053 | ||
fb265c9c TT |
3054 | bh = ext4_sb_bread(inode->i_sb, ce->e_value, REQ_PRIO); |
3055 | if (IS_ERR(bh)) { | |
3056 | if (PTR_ERR(bh) == -ENOMEM) | |
3057 | return NULL; | |
7159a986 | 3058 | bh = NULL; |
24676da4 | 3059 | EXT4_ERROR_INODE(inode, "block %lu read error", |
c07dfcb4 | 3060 | (unsigned long)ce->e_value); |
617ba13b | 3061 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
ac27a0ec DK |
3062 | *pce = ce; |
3063 | return bh; | |
3064 | } | |
3065 | brelse(bh); | |
47387409 | 3066 | ce = mb_cache_entry_find_next(ea_block_cache, ce); |
ac27a0ec DK |
3067 | } |
3068 | return NULL; | |
3069 | } | |
3070 | ||
3071 | #define NAME_HASH_SHIFT 5 | |
3072 | #define VALUE_HASH_SHIFT 16 | |
3073 | ||
3074 | /* | |
617ba13b | 3075 | * ext4_xattr_hash_entry() |
ac27a0ec DK |
3076 | * |
3077 | * Compute the hash of an extended attribute. | |
3078 | */ | |
b9fc761e TE |
3079 | static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
3080 | size_t value_count) | |
ac27a0ec DK |
3081 | { |
3082 | __u32 hash = 0; | |
ac27a0ec | 3083 | |
b9fc761e | 3084 | while (name_len--) { |
ac27a0ec DK |
3085 | hash = (hash << NAME_HASH_SHIFT) ^ |
3086 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ | |
3087 | *name++; | |
3088 | } | |
b9fc761e TE |
3089 | while (value_count--) { |
3090 | hash = (hash << VALUE_HASH_SHIFT) ^ | |
3091 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ | |
3092 | le32_to_cpu(*value++); | |
ac27a0ec | 3093 | } |
b9fc761e | 3094 | return cpu_to_le32(hash); |
ac27a0ec DK |
3095 | } |
3096 | ||
3097 | #undef NAME_HASH_SHIFT | |
3098 | #undef VALUE_HASH_SHIFT | |
3099 | ||
3100 | #define BLOCK_HASH_SHIFT 16 | |
3101 | ||
3102 | /* | |
617ba13b | 3103 | * ext4_xattr_rehash() |
ac27a0ec DK |
3104 | * |
3105 | * Re-compute the extended attribute hash value after an entry has changed. | |
3106 | */ | |
daf83281 | 3107 | static void ext4_xattr_rehash(struct ext4_xattr_header *header) |
ac27a0ec | 3108 | { |
617ba13b | 3109 | struct ext4_xattr_entry *here; |
ac27a0ec DK |
3110 | __u32 hash = 0; |
3111 | ||
ac27a0ec DK |
3112 | here = ENTRY(header+1); |
3113 | while (!IS_LAST_ENTRY(here)) { | |
3114 | if (!here->e_hash) { | |
3115 | /* Block is not shared if an entry's hash value == 0 */ | |
3116 | hash = 0; | |
3117 | break; | |
3118 | } | |
3119 | hash = (hash << BLOCK_HASH_SHIFT) ^ | |
3120 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ | |
3121 | le32_to_cpu(here->e_hash); | |
617ba13b | 3122 | here = EXT4_XATTR_NEXT(here); |
ac27a0ec DK |
3123 | } |
3124 | header->h_hash = cpu_to_le32(hash); | |
3125 | } | |
3126 | ||
3127 | #undef BLOCK_HASH_SHIFT | |
3128 | ||
9c191f70 M |
3129 | #define HASH_BUCKET_BITS 10 |
3130 | ||
7a2508e1 | 3131 | struct mb_cache * |
82939d79 | 3132 | ext4_xattr_create_cache(void) |
ac27a0ec | 3133 | { |
7a2508e1 | 3134 | return mb_cache_create(HASH_BUCKET_BITS); |
ac27a0ec DK |
3135 | } |
3136 | ||
7a2508e1 | 3137 | void ext4_xattr_destroy_cache(struct mb_cache *cache) |
ac27a0ec | 3138 | { |
9c191f70 | 3139 | if (cache) |
7a2508e1 | 3140 | mb_cache_destroy(cache); |
ac27a0ec | 3141 | } |
9c191f70 | 3142 |