1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2017-2018 HUAWEI, Inc.
4 * https://www.huawei.com/
5 * Copyright (C) 2021-2022, Alibaba Cloud
6 */
7 #include <linux/security.h>
8 #include <linux/xxhash.h>
9 #include "xattr.h"
10
11 struct erofs_xattr_iter {
12 struct super_block *sb;
13 struct erofs_buf buf;
14 erofs_off_t pos;
15 void *kaddr;
16
17 char *buffer;
18 int buffer_size, buffer_ofs;
19
20 /* getxattr */
21 int index, infix_len;
22 struct qstr name;
23
24 /* listxattr */
25 struct dentry *dentry;
26 };
27
28 static const char *erofs_xattr_prefix(unsigned int idx, struct dentry *dentry);
29
erofs_init_inode_xattrs(struct inode * inode)30 static int erofs_init_inode_xattrs(struct inode *inode)
31 {
32 struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
33 struct erofs_inode *vi = EROFS_I(inode);
34 struct super_block *sb = inode->i_sb;
35 const struct erofs_xattr_ibody_header *ih;
36 __le32 *xattr_id;
37 erofs_off_t pos;
38 unsigned int i;
39 int ret = 0;
40
41 if (!vi->xattr_isize)
42 return -ENODATA;
43
44 /* the most case is that xattrs of this inode are initialized. */
45 if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags)) {
46 /*
47 * paired with smp_mb() at the end of the function to ensure
48 * fields will only be observed after the bit is set.
49 */
50 smp_mb();
51 return 0;
52 }
53 if (wait_on_bit_lock(&vi->flags, EROFS_I_BL_XATTR_BIT, TASK_KILLABLE))
54 return -ERESTARTSYS;
55
56 /* someone has initialized xattrs for us? */
57 if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags))
58 goto out_unlock;
59
60 /*
61 * bypass all xattr operations if ->xattr_isize is not greater than
62 * sizeof(struct erofs_xattr_ibody_header), in detail:
63 * 1) it is not enough to contain erofs_xattr_ibody_header then
64 * ->xattr_isize should be 0 (it means no xattr);
65 * 2) it is just to contain erofs_xattr_ibody_header, which is on-disk
66 * undefined right now (maybe use later with some new sb feature).
67 */
68 if (vi->xattr_isize == sizeof(struct erofs_xattr_ibody_header)) {
69 erofs_err(sb, "xattr_isize %d of nid %llu is not supported yet",
70 vi->xattr_isize, vi->nid);
71 ret = -EOPNOTSUPP;
72 goto out_unlock;
73 } else if (vi->xattr_isize < sizeof(struct erofs_xattr_ibody_header)) {
74 erofs_err(sb, "bogus xattr ibody @ nid %llu", vi->nid);
75 DBG_BUGON(1);
76 ret = -EFSCORRUPTED;
77 goto out_unlock;
78 }
79
80 pos = erofs_iloc(inode) + vi->inode_isize;
81 ih = erofs_read_metabuf(&buf, sb, pos, erofs_inode_in_metabox(inode));
82 if (IS_ERR(ih)) {
83 ret = PTR_ERR(ih);
84 goto out_unlock;
85 }
86 vi->xattr_name_filter = le32_to_cpu(ih->h_name_filter);
87 vi->xattr_shared_count = ih->h_shared_count;
88 vi->xattr_shared_xattrs = kmalloc_objs(uint, vi->xattr_shared_count);
89 if (!vi->xattr_shared_xattrs) {
90 erofs_put_metabuf(&buf);
91 ret = -ENOMEM;
92 goto out_unlock;
93 }
94
95 /* skip the ibody header and read the shared xattr array */
96 pos += sizeof(struct erofs_xattr_ibody_header);
97 for (i = 0; i < vi->xattr_shared_count; ++i) {
98 xattr_id = erofs_bread(&buf, pos + i * sizeof(__le32), true);
99 if (IS_ERR(xattr_id)) {
100 kfree(vi->xattr_shared_xattrs);
101 vi->xattr_shared_xattrs = NULL;
102 ret = PTR_ERR(xattr_id);
103 goto out_unlock;
104 }
105 vi->xattr_shared_xattrs[i] = le32_to_cpu(*xattr_id);
106 }
107 erofs_put_metabuf(&buf);
108
109 /* paired with smp_mb() at the beginning of the function. */
110 smp_mb();
111 set_bit(EROFS_I_EA_INITED_BIT, &vi->flags);
112 out_unlock:
113 clear_and_wake_up_bit(EROFS_I_BL_XATTR_BIT, &vi->flags);
114 return ret;
115 }
116
erofs_xattr_copy_to_buffer(struct erofs_xattr_iter * it,unsigned int len)117 static int erofs_xattr_copy_to_buffer(struct erofs_xattr_iter *it,
118 unsigned int len)
119 {
120 unsigned int slice, processed;
121 struct super_block *sb = it->sb;
122
123 for (processed = 0; processed < len; processed += slice) {
124 it->kaddr = erofs_bread(&it->buf, it->pos, true);
125 if (IS_ERR(it->kaddr))
126 return PTR_ERR(it->kaddr);
127
128 slice = min_t(unsigned int, sb->s_blocksize -
129 erofs_blkoff(sb, it->pos), len - processed);
130 memcpy(it->buffer + it->buffer_ofs, it->kaddr, slice);
131 it->buffer_ofs += slice;
132 it->pos += slice;
133 }
134 return 0;
135 }
136
erofs_listxattr_foreach(struct erofs_xattr_iter * it)137 static int erofs_listxattr_foreach(struct erofs_xattr_iter *it)
138 {
139 struct erofs_xattr_entry entry;
140 unsigned int base_index, name_total, prefix_len, infix_len = 0;
141 const char *prefix, *infix = NULL;
142 int err;
143
144 /* 1. handle xattr entry */
145 entry = *(struct erofs_xattr_entry *)it->kaddr;
146 it->pos += sizeof(struct erofs_xattr_entry);
147
148 base_index = entry.e_name_index;
149 if (entry.e_name_index & EROFS_XATTR_LONG_PREFIX) {
150 struct erofs_sb_info *sbi = EROFS_SB(it->sb);
151 struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
152 (entry.e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
153
154 if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count)
155 return 0;
156 infix = pf->prefix->infix;
157 infix_len = pf->infix_len;
158 base_index = pf->prefix->base_index;
159 }
160
161 prefix = erofs_xattr_prefix(base_index, it->dentry);
162 if (!prefix)
163 return 0;
164 prefix_len = strlen(prefix);
165 name_total = prefix_len + infix_len + entry.e_name_len + 1;
166
167 if (!it->buffer) {
168 it->buffer_ofs += name_total;
169 return 0;
170 }
171
172 if (it->buffer_ofs + name_total > it->buffer_size)
173 return -ERANGE;
174
175 memcpy(it->buffer + it->buffer_ofs, prefix, prefix_len);
176 memcpy(it->buffer + it->buffer_ofs + prefix_len, infix, infix_len);
177 it->buffer_ofs += prefix_len + infix_len;
178
179 /* 2. handle xattr name */
180 err = erofs_xattr_copy_to_buffer(it, entry.e_name_len);
181 if (err)
182 return err;
183
184 it->buffer[it->buffer_ofs++] = '\0';
185 return 0;
186 }
187
erofs_getxattr_foreach(struct erofs_xattr_iter * it)188 static int erofs_getxattr_foreach(struct erofs_xattr_iter *it)
189 {
190 struct super_block *sb = it->sb;
191 struct erofs_xattr_entry entry;
192 unsigned int slice, processed, value_sz;
193
194 /* 1. handle xattr entry */
195 entry = *(struct erofs_xattr_entry *)it->kaddr;
196 it->pos += sizeof(struct erofs_xattr_entry);
197 value_sz = le16_to_cpu(entry.e_value_size);
198
199 /* should also match the infix for long name prefixes */
200 if (entry.e_name_index & EROFS_XATTR_LONG_PREFIX) {
201 struct erofs_sb_info *sbi = EROFS_SB(sb);
202 struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
203 (entry.e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
204
205 if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count)
206 return -ENODATA;
207
208 if (it->index != pf->prefix->base_index ||
209 it->name.len != entry.e_name_len + pf->infix_len)
210 return -ENODATA;
211
212 if (memcmp(it->name.name, pf->prefix->infix, pf->infix_len))
213 return -ENODATA;
214
215 it->infix_len = pf->infix_len;
216 } else {
217 if (it->index != entry.e_name_index ||
218 it->name.len != entry.e_name_len)
219 return -ENODATA;
220
221 it->infix_len = 0;
222 }
223
224 /* 2. handle xattr name */
225 for (processed = 0; processed < entry.e_name_len; processed += slice) {
226 it->kaddr = erofs_bread(&it->buf, it->pos, true);
227 if (IS_ERR(it->kaddr))
228 return PTR_ERR(it->kaddr);
229
230 slice = min_t(unsigned int,
231 sb->s_blocksize - erofs_blkoff(sb, it->pos),
232 entry.e_name_len - processed);
233 if (memcmp(it->name.name + it->infix_len + processed,
234 it->kaddr, slice))
235 return -ENODATA;
236 it->pos += slice;
237 }
238
239 /* 3. handle xattr value */
240 if (!it->buffer) {
241 it->buffer_ofs = value_sz;
242 return 0;
243 }
244
245 if (it->buffer_size < value_sz)
246 return -ERANGE;
247
248 return erofs_xattr_copy_to_buffer(it, value_sz);
249 }
250
erofs_xattr_iter_inline(struct erofs_xattr_iter * it,struct inode * inode,bool getxattr)251 static int erofs_xattr_iter_inline(struct erofs_xattr_iter *it,
252 struct inode *inode, bool getxattr)
253 {
254 struct erofs_inode *const vi = EROFS_I(inode);
255 unsigned int xattr_header_sz, remaining, entry_sz;
256 erofs_off_t next_pos;
257 int ret;
258
259 xattr_header_sz = sizeof(struct erofs_xattr_ibody_header) +
260 sizeof(u32) * vi->xattr_shared_count;
261 if (xattr_header_sz >= vi->xattr_isize) {
262 DBG_BUGON(xattr_header_sz > vi->xattr_isize);
263 return -ENODATA;
264 }
265
266 ret = erofs_init_metabuf(&it->buf, it->sb, erofs_inode_in_metabox(inode));
267 if (ret)
268 return ret;
269 remaining = vi->xattr_isize - xattr_header_sz;
270 it->pos = erofs_iloc(inode) + vi->inode_isize + xattr_header_sz;
271
272 while (remaining) {
273 it->kaddr = erofs_bread(&it->buf, it->pos, true);
274 if (IS_ERR(it->kaddr))
275 return PTR_ERR(it->kaddr);
276
277 entry_sz = erofs_xattr_entry_size(it->kaddr);
278 /* xattr on-disk corruption: xattr entry beyond xattr_isize */
279 if (remaining < entry_sz) {
280 DBG_BUGON(1);
281 return -EFSCORRUPTED;
282 }
283 remaining -= entry_sz;
284 next_pos = it->pos + entry_sz;
285
286 if (getxattr)
287 ret = erofs_getxattr_foreach(it);
288 else
289 ret = erofs_listxattr_foreach(it);
290 if ((getxattr && ret != -ENODATA) || (!getxattr && ret))
291 break;
292
293 it->pos = next_pos;
294 }
295 return ret;
296 }
297
erofs_xattr_iter_shared(struct erofs_xattr_iter * it,struct inode * inode,bool getxattr)298 static int erofs_xattr_iter_shared(struct erofs_xattr_iter *it,
299 struct inode *inode, bool getxattr)
300 {
301 struct erofs_inode *const vi = EROFS_I(inode);
302 struct super_block *const sb = it->sb;
303 struct erofs_sb_info *sbi = EROFS_SB(sb);
304 unsigned int i = 0;
305 int ret;
306
307 ret = erofs_init_metabuf(&it->buf, sb,
308 erofs_sb_has_shared_ea_in_metabox(sbi));
309 if (ret)
310 return ret;
311
312 while (i < vi->xattr_shared_count) {
313 it->pos = erofs_pos(sb, sbi->xattr_blkaddr) +
314 vi->xattr_shared_xattrs[i++] * sizeof(__le32);
315 it->kaddr = erofs_bread(&it->buf, it->pos, true);
316 if (IS_ERR(it->kaddr))
317 return PTR_ERR(it->kaddr);
318
319 if (getxattr)
320 ret = erofs_getxattr_foreach(it);
321 else
322 ret = erofs_listxattr_foreach(it);
323 if ((getxattr && ret != -ENODATA) || (!getxattr && ret))
324 break;
325 }
326 return i ? ret : -ENODATA;
327 }
328
erofs_getxattr(struct inode * inode,int index,const char * name,void * buffer,size_t buffer_size)329 static int erofs_getxattr(struct inode *inode, int index, const char *name,
330 void *buffer, size_t buffer_size)
331 {
332 int ret;
333 unsigned int hashbit;
334 struct erofs_xattr_iter it;
335 struct erofs_inode *vi = EROFS_I(inode);
336 struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
337
338 if (!name)
339 return -EINVAL;
340
341 ret = erofs_init_inode_xattrs(inode);
342 if (ret)
343 return ret;
344
345 /* reserved flag is non-zero if there's any change of on-disk format */
346 if (erofs_sb_has_xattr_filter(sbi) && !sbi->xattr_filter_reserved) {
347 hashbit = xxh32(name, strlen(name),
348 EROFS_XATTR_FILTER_SEED + index);
349 hashbit &= EROFS_XATTR_FILTER_BITS - 1;
350 if (vi->xattr_name_filter & (1U << hashbit))
351 return -ENODATA;
352 }
353
354 it.index = index;
355 it.name = QSTR(name);
356 if (it.name.len > EROFS_NAME_LEN)
357 return -ERANGE;
358
359 it.sb = inode->i_sb;
360 it.buf = __EROFS_BUF_INITIALIZER;
361 it.buffer = buffer;
362 it.buffer_size = buffer_size;
363 it.buffer_ofs = 0;
364
365 ret = erofs_xattr_iter_inline(&it, inode, true);
366 if (ret == -ENODATA)
367 ret = erofs_xattr_iter_shared(&it, inode, true);
368 erofs_put_metabuf(&it.buf);
369 return ret ? ret : it.buffer_ofs;
370 }
371
erofs_listxattr(struct dentry * dentry,char * buffer,size_t buffer_size)372 ssize_t erofs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
373 {
374 int ret;
375 struct erofs_xattr_iter it;
376 struct inode *inode = d_inode(dentry);
377
378 ret = erofs_init_inode_xattrs(inode);
379 if (ret == -ENODATA)
380 return 0;
381 if (ret)
382 return ret;
383
384 it.sb = dentry->d_sb;
385 it.buf = __EROFS_BUF_INITIALIZER;
386 it.dentry = dentry;
387 it.buffer = buffer;
388 it.buffer_size = buffer_size;
389 it.buffer_ofs = 0;
390
391 ret = erofs_xattr_iter_inline(&it, inode, false);
392 if (!ret || ret == -ENODATA)
393 ret = erofs_xattr_iter_shared(&it, inode, false);
394 if (ret == -ENODATA)
395 ret = 0;
396 erofs_put_metabuf(&it.buf);
397 return ret ? ret : it.buffer_ofs;
398 }
399
erofs_xattr_user_list(struct dentry * dentry)400 static bool erofs_xattr_user_list(struct dentry *dentry)
401 {
402 return test_opt(&EROFS_SB(dentry->d_sb)->opt, XATTR_USER);
403 }
404
erofs_xattr_trusted_list(struct dentry * dentry)405 static bool erofs_xattr_trusted_list(struct dentry *dentry)
406 {
407 return capable(CAP_SYS_ADMIN);
408 }
409
erofs_xattr_generic_get(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * buffer,size_t size)410 static int erofs_xattr_generic_get(const struct xattr_handler *handler,
411 struct dentry *unused, struct inode *inode,
412 const char *name, void *buffer, size_t size)
413 {
414 if (handler->flags == EROFS_XATTR_INDEX_USER &&
415 !test_opt(&EROFS_I_SB(inode)->opt, XATTR_USER))
416 return -EOPNOTSUPP;
417
418 return erofs_getxattr(inode, handler->flags, name, buffer, size);
419 }
420
421 static const struct xattr_handler erofs_xattr_user_handler = {
422 .prefix = XATTR_USER_PREFIX,
423 .flags = EROFS_XATTR_INDEX_USER,
424 .list = erofs_xattr_user_list,
425 .get = erofs_xattr_generic_get,
426 };
427
428 static const struct xattr_handler erofs_xattr_trusted_handler = {
429 .prefix = XATTR_TRUSTED_PREFIX,
430 .flags = EROFS_XATTR_INDEX_TRUSTED,
431 .list = erofs_xattr_trusted_list,
432 .get = erofs_xattr_generic_get,
433 };
434
435 #ifdef CONFIG_EROFS_FS_SECURITY
436 static const struct xattr_handler erofs_xattr_security_handler = {
437 .prefix = XATTR_SECURITY_PREFIX,
438 .flags = EROFS_XATTR_INDEX_SECURITY,
439 .get = erofs_xattr_generic_get,
440 };
441 #endif
442
443 const struct xattr_handler * const erofs_xattr_handlers[] = {
444 &erofs_xattr_user_handler,
445 &erofs_xattr_trusted_handler,
446 #ifdef CONFIG_EROFS_FS_SECURITY
447 &erofs_xattr_security_handler,
448 #endif
449 NULL,
450 };
451
erofs_xattr_prefix(unsigned int idx,struct dentry * dentry)452 static const char *erofs_xattr_prefix(unsigned int idx, struct dentry *dentry)
453 {
454 static const struct xattr_handler * const xattr_handler_map[] = {
455 [EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
456 #ifdef CONFIG_EROFS_FS_POSIX_ACL
457 [EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &nop_posix_acl_access,
458 [EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &nop_posix_acl_default,
459 #endif
460 [EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
461 #ifdef CONFIG_EROFS_FS_SECURITY
462 [EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
463 #endif
464 };
465 const struct xattr_handler *handler = NULL;
466
467 if (idx && idx < ARRAY_SIZE(xattr_handler_map)) {
468 handler = xattr_handler_map[idx];
469 if (xattr_handler_can_list(handler, dentry))
470 return xattr_prefix(handler);
471 }
472 return NULL;
473 }
474
erofs_xattr_prefixes_cleanup(struct super_block * sb)475 void erofs_xattr_prefixes_cleanup(struct super_block *sb)
476 {
477 struct erofs_sb_info *sbi = EROFS_SB(sb);
478 int i;
479
480 if (sbi->xattr_prefixes) {
481 for (i = 0; i < sbi->xattr_prefix_count; i++)
482 kfree(sbi->xattr_prefixes[i].prefix);
483 kfree(sbi->xattr_prefixes);
484 sbi->xattr_prefixes = NULL;
485 }
486 }
487
erofs_xattr_prefixes_init(struct super_block * sb)488 int erofs_xattr_prefixes_init(struct super_block *sb)
489 {
490 struct erofs_sb_info *sbi = EROFS_SB(sb);
491 struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
492 erofs_off_t pos = (erofs_off_t)sbi->xattr_prefix_start << 2;
493 struct erofs_xattr_prefix_item *pfs;
494 int ret = 0, i, len;
495 bool plain = erofs_sb_has_plain_xattr_pfx(sbi);
496
497 if (!sbi->xattr_prefix_count)
498 return 0;
499
500 pfs = kzalloc_objs(*pfs, sbi->xattr_prefix_count);
501 if (!pfs)
502 return -ENOMEM;
503
504 if (!plain) {
505 if (erofs_sb_has_metabox(sbi))
506 (void)erofs_init_metabuf(&buf, sb, true);
507 else if (sbi->packed_inode)
508 buf.mapping = sbi->packed_inode->i_mapping;
509 else
510 plain = true;
511 }
512 if (plain)
513 (void)erofs_init_metabuf(&buf, sb, false);
514
515 for (i = 0; i < sbi->xattr_prefix_count; i++) {
516 void *ptr = erofs_read_metadata(sb, &buf, &pos, &len);
517
518 if (IS_ERR(ptr)) {
519 ret = PTR_ERR(ptr);
520 break;
521 } else if (len < sizeof(*pfs->prefix) ||
522 len > EROFS_NAME_LEN + sizeof(*pfs->prefix)) {
523 kfree(ptr);
524 ret = -EFSCORRUPTED;
525 break;
526 }
527 pfs[i].prefix = ptr;
528 pfs[i].infix_len = len - sizeof(struct erofs_xattr_long_prefix);
529 }
530
531 erofs_put_metabuf(&buf);
532 if (!ret && erofs_sb_has_ishare_xattrs(sbi)) {
533 struct erofs_xattr_prefix_item *pf = pfs + sbi->ishare_xattr_prefix_id;
534 struct erofs_xattr_long_prefix *newpfx;
535
536 newpfx = krealloc(pf->prefix,
537 sizeof(*newpfx) + pf->infix_len + 1, GFP_KERNEL);
538 if (newpfx) {
539 newpfx->infix[pf->infix_len] = '\0';
540 pf->prefix = newpfx;
541 } else {
542 ret = -ENOMEM;
543 }
544 }
545 sbi->xattr_prefixes = pfs;
546 if (ret)
547 erofs_xattr_prefixes_cleanup(sb);
548 return ret;
549 }
550
551 #ifdef CONFIG_EROFS_FS_POSIX_ACL
erofs_get_acl(struct inode * inode,int type,bool rcu)552 struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu)
553 {
554 struct posix_acl *acl;
555 int prefix, rc;
556 char *value = NULL;
557
558 if (rcu)
559 return ERR_PTR(-ECHILD);
560
561 switch (type) {
562 case ACL_TYPE_ACCESS:
563 prefix = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS;
564 break;
565 case ACL_TYPE_DEFAULT:
566 prefix = EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT;
567 break;
568 default:
569 return ERR_PTR(-EINVAL);
570 }
571
572 rc = erofs_getxattr(inode, prefix, "", NULL, 0);
573 if (rc > 0) {
574 value = kmalloc(rc, GFP_KERNEL);
575 if (!value)
576 return ERR_PTR(-ENOMEM);
577 rc = erofs_getxattr(inode, prefix, "", value, rc);
578 }
579
580 if (rc == -ENODATA)
581 acl = NULL;
582 else if (rc < 0)
583 acl = ERR_PTR(rc);
584 else
585 acl = posix_acl_from_xattr(&init_user_ns, value, rc);
586 kfree(value);
587 return acl;
588 }
589
erofs_inode_has_noacl(struct inode * inode,void * kaddr,unsigned int ofs)590 bool erofs_inode_has_noacl(struct inode *inode, void *kaddr, unsigned int ofs)
591 {
592 static const unsigned int bitmask =
593 BIT(21) | /* system.posix_acl_default */
594 BIT(30); /* system.posix_acl_access */
595 struct erofs_sb_info *sbi = EROFS_I_SB(inode);
596 const struct erofs_xattr_ibody_header *ih = kaddr + ofs;
597
598 if (EROFS_I(inode)->xattr_isize < sizeof(*ih))
599 return true;
600
601 if (erofs_sb_has_xattr_filter(sbi) && !sbi->xattr_filter_reserved &&
602 !check_add_overflow(ofs, sizeof(*ih), &ofs) &&
603 ofs <= i_blocksize(inode)) {
604 if ((le32_to_cpu(ih->h_name_filter) & bitmask) == bitmask)
605 return true;
606 }
607 return false;
608 }
609 #endif
610
611 #ifdef CONFIG_EROFS_FS_PAGE_CACHE_SHARE
erofs_xattr_fill_inode_fingerprint(struct erofs_inode_fingerprint * fp,struct inode * inode,const char * domain_id)612 int erofs_xattr_fill_inode_fingerprint(struct erofs_inode_fingerprint *fp,
613 struct inode *inode, const char *domain_id)
614 {
615 struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
616 struct erofs_xattr_prefix_item *prefix;
617 const char *infix;
618 int valuelen, base_index;
619
620 if (!test_opt(&sbi->opt, INODE_SHARE))
621 return -EOPNOTSUPP;
622 if (!sbi->xattr_prefixes)
623 return -EINVAL;
624 prefix = sbi->xattr_prefixes + sbi->ishare_xattr_prefix_id;
625 infix = prefix->prefix->infix;
626 base_index = prefix->prefix->base_index;
627 valuelen = erofs_getxattr(inode, base_index, infix, NULL, 0);
628 if (valuelen <= 0 || valuelen > (1 << sbi->blkszbits))
629 return -EFSCORRUPTED;
630 fp->size = valuelen + (domain_id ? strlen(domain_id) : 0);
631 fp->opaque = kmalloc(fp->size, GFP_KERNEL);
632 if (!fp->opaque)
633 return -ENOMEM;
634 if (valuelen != erofs_getxattr(inode, base_index, infix,
635 fp->opaque, valuelen)) {
636 kfree(fp->opaque);
637 fp->opaque = NULL;
638 return -EFSCORRUPTED;
639 }
640 memcpy(fp->opaque + valuelen, domain_id, fp->size - valuelen);
641 return 0;
642 }
643 #endif
644