1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * fs/f2fs/xattr.c
4 *
5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 * http://www.samsung.com/
7 *
8 * Portions of this code from linux/fs/ext2/xattr.c
9 *
10 * Copyright (C) 2001-2003 Andreas Gruenbacher <agruen@suse.de>
11 *
12 * Fix by Harrison Xing <harrison@mountainviewdata.com>.
13 * Extended attributes for symlinks and special files added per
14 * suggestion of Luka Renko <luka.renko@hermes.si>.
15 * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>,
16 * Red Hat Inc.
17 */
18 #include <linux/rwsem.h>
19 #include <linux/f2fs_fs.h>
20 #include <linux/security.h>
21 #include <linux/posix_acl_xattr.h>
22 #include "f2fs.h"
23 #include "xattr.h"
24 #include "segment.h"
25
26 static void *xattr_alloc(struct f2fs_sb_info *sbi, int size, bool *is_inline)
27 {
28 if (likely(size == sbi->inline_xattr_slab_size)) {
29 *is_inline = true;
30 return f2fs_kmem_cache_alloc(sbi->inline_xattr_slab,
31 GFP_F2FS_ZERO, false, sbi);
32 }
33 *is_inline = false;
34 return f2fs_kzalloc(sbi, size, GFP_NOFS);
35 }
36
37 static void xattr_free(struct f2fs_sb_info *sbi, void *xattr_addr,
38 bool is_inline)
39 {
40 if (is_inline)
41 kmem_cache_free(sbi->inline_xattr_slab, xattr_addr);
42 else
43 kfree(xattr_addr);
44 }
45
46 static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
47 struct dentry *unused, struct inode *inode,
48 const char *name, void *buffer, size_t size)
49 {
50 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
51
52 switch (handler->flags) {
53 case F2FS_XATTR_INDEX_USER:
54 if (!test_opt(sbi, XATTR_USER))
55 return -EOPNOTSUPP;
56 break;
57 case F2FS_XATTR_INDEX_TRUSTED:
58 case F2FS_XATTR_INDEX_SECURITY:
59 break;
60 default:
61 return -EINVAL;
62 }
63 return f2fs_getxattr(inode, handler->flags, name,
64 buffer, size, NULL);
65 }
66
67 static int f2fs_xattr_generic_set(const struct xattr_handler *handler,
68 struct mnt_idmap *idmap,
69 struct dentry *unused, struct inode *inode,
70 const char *name, const void *value,
71 size_t size, int flags)
72 {
73 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
74
75 switch (handler->flags) {
76 case F2FS_XATTR_INDEX_USER:
77 if (!test_opt(sbi, XATTR_USER))
78 return -EOPNOTSUPP;
79 break;
80 case F2FS_XATTR_INDEX_TRUSTED:
81 case F2FS_XATTR_INDEX_SECURITY:
82 break;
83 default:
84 return -EINVAL;
85 }
86 return f2fs_setxattr(inode, handler->flags, name,
87 value, size, NULL, flags);
88 }
89
90 static bool f2fs_xattr_user_list(struct dentry *dentry)
91 {
92 struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
93
94 return test_opt(sbi, XATTR_USER);
95 }
96
97 static bool f2fs_xattr_trusted_list(struct dentry *dentry)
98 {
99 return capable(CAP_SYS_ADMIN);
100 }
101
102 static int f2fs_xattr_advise_get(const struct xattr_handler *handler,
103 struct dentry *unused, struct inode *inode,
104 const char *name, void *buffer, size_t size)
105 {
106 if (buffer)
107 *((char *)buffer) = F2FS_I(inode)->i_advise;
108 return sizeof(char);
109 }
110
111 static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
112 struct mnt_idmap *idmap,
113 struct dentry *unused, struct inode *inode,
114 const char *name, const void *value,
115 size_t size, int flags)
116 {
117 unsigned char old_advise = F2FS_I(inode)->i_advise;
118 unsigned char new_advise;
119
120 if (!inode_owner_or_capable(&nop_mnt_idmap, inode))
121 return -EPERM;
122 if (value == NULL)
123 return -EINVAL;
124
125 new_advise = *(char *)value;
126 if (new_advise & ~FADVISE_MODIFIABLE_BITS)
127 return -EINVAL;
128
129 new_advise = new_advise & FADVISE_MODIFIABLE_BITS;
130 new_advise |= old_advise & ~FADVISE_MODIFIABLE_BITS;
131
132 F2FS_I(inode)->i_advise = new_advise;
133 f2fs_mark_inode_dirty_sync(inode, true);
134 return 0;
135 }
136
137 #ifdef CONFIG_F2FS_FS_SECURITY
138 static int f2fs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
139 void *page)
140 {
141 const struct xattr *xattr;
142 int err = 0;
143
144 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
145 err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY,
146 xattr->name, xattr->value,
147 xattr->value_len, (struct page *)page, 0);
148 if (err < 0)
149 break;
150 }
151 return err;
152 }
153
154 int f2fs_init_security(struct inode *inode, struct inode *dir,
155 const struct qstr *qstr, struct page *ipage)
156 {
157 return security_inode_init_security(inode, dir, qstr,
158 &f2fs_initxattrs, ipage);
159 }
160 #endif
161
162 const struct xattr_handler f2fs_xattr_user_handler = {
163 .prefix = XATTR_USER_PREFIX,
164 .flags = F2FS_XATTR_INDEX_USER,
165 .list = f2fs_xattr_user_list,
166 .get = f2fs_xattr_generic_get,
167 .set = f2fs_xattr_generic_set,
168 };
169
170 const struct xattr_handler f2fs_xattr_trusted_handler = {
171 .prefix = XATTR_TRUSTED_PREFIX,
172 .flags = F2FS_XATTR_INDEX_TRUSTED,
173 .list = f2fs_xattr_trusted_list,
174 .get = f2fs_xattr_generic_get,
175 .set = f2fs_xattr_generic_set,
176 };
177
178 const struct xattr_handler f2fs_xattr_advise_handler = {
179 .name = F2FS_SYSTEM_ADVISE_NAME,
180 .flags = F2FS_XATTR_INDEX_ADVISE,
181 .get = f2fs_xattr_advise_get,
182 .set = f2fs_xattr_advise_set,
183 };
184
185 const struct xattr_handler f2fs_xattr_security_handler = {
186 .prefix = XATTR_SECURITY_PREFIX,
187 .flags = F2FS_XATTR_INDEX_SECURITY,
188 .get = f2fs_xattr_generic_get,
189 .set = f2fs_xattr_generic_set,
190 };
191
192 static const struct xattr_handler * const f2fs_xattr_handler_map[] = {
193 [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
194 #ifdef CONFIG_F2FS_FS_POSIX_ACL
195 [F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &nop_posix_acl_access,
196 [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &nop_posix_acl_default,
197 #endif
198 [F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
199 #ifdef CONFIG_F2FS_FS_SECURITY
200 [F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
201 #endif
202 [F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
203 };
204
205 const struct xattr_handler * const f2fs_xattr_handlers[] = {
206 &f2fs_xattr_user_handler,
207 &f2fs_xattr_trusted_handler,
208 #ifdef CONFIG_F2FS_FS_SECURITY
209 &f2fs_xattr_security_handler,
210 #endif
211 &f2fs_xattr_advise_handler,
212 NULL,
213 };
214
215 static inline const char *f2fs_xattr_prefix(int index,
216 struct dentry *dentry)
217 {
218 const struct xattr_handler *handler = NULL;
219
220 if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map))
221 handler = f2fs_xattr_handler_map[index];
222
223 if (!xattr_handler_can_list(handler, dentry))
224 return NULL;
225
226 return xattr_prefix(handler);
227 }
228
229 static struct f2fs_xattr_entry *__find_xattr(void *base_addr,
230 void *last_base_addr, void **last_addr,
231 int index, size_t len, const char *name)
232 {
233 struct f2fs_xattr_entry *entry;
234
235 list_for_each_xattr(entry, base_addr) {
236 if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
237 (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) {
238 if (last_addr)
239 *last_addr = entry;
240 return NULL;
241 }
242
243 if (entry->e_name_index != index)
244 continue;
245 if (entry->e_name_len != len)
246 continue;
247 if (!memcmp(entry->e_name, name, len))
248 break;
249 }
250 return entry;
251 }
252
253 static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode,
254 void *base_addr, void **last_addr, int index,
255 size_t len, const char *name)
256 {
257 struct f2fs_xattr_entry *entry;
258 unsigned int inline_size = inline_xattr_size(inode);
259 void *max_addr = base_addr + inline_size;
260
261 entry = __find_xattr(base_addr, max_addr, last_addr, index, len, name);
262 if (!entry)
263 return NULL;
264
265 /* inline xattr header or entry across max inline xattr size */
266 if (IS_XATTR_LAST_ENTRY(entry) &&
267 (void *)entry + sizeof(__u32) > max_addr) {
268 *last_addr = entry;
269 return NULL;
270 }
271 return entry;
272 }
273
274 static int read_inline_xattr(struct inode *inode, struct page *ipage,
275 void *txattr_addr)
276 {
277 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
278 unsigned int inline_size = inline_xattr_size(inode);
279 struct page *page = NULL;
280 void *inline_addr;
281
282 if (ipage) {
283 inline_addr = inline_xattr_addr(inode, ipage);
284 } else {
285 page = f2fs_get_node_page(sbi, inode->i_ino);
286 if (IS_ERR(page))
287 return PTR_ERR(page);
288
289 inline_addr = inline_xattr_addr(inode, page);
290 }
291 memcpy(txattr_addr, inline_addr, inline_size);
292 f2fs_put_page(page, 1);
293
294 return 0;
295 }
296
297 static int read_xattr_block(struct inode *inode, void *txattr_addr)
298 {
299 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
300 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
301 unsigned int inline_size = inline_xattr_size(inode);
302 struct page *xpage;
303 void *xattr_addr;
304
305 /* The inode already has an extended attribute block. */
306 xpage = f2fs_get_node_page(sbi, xnid);
307 if (IS_ERR(xpage))
308 return PTR_ERR(xpage);
309
310 xattr_addr = page_address(xpage);
311 memcpy(txattr_addr + inline_size, xattr_addr, VALID_XATTR_BLOCK_SIZE);
312 f2fs_put_page(xpage, 1);
313
314 return 0;
315 }
316
317 static int lookup_all_xattrs(struct inode *inode, struct page *ipage,
318 unsigned int index, unsigned int len,
319 const char *name, struct f2fs_xattr_entry **xe,
320 void **base_addr, int *base_size,
321 bool *is_inline)
322 {
323 void *cur_addr, *txattr_addr, *last_txattr_addr;
324 void *last_addr = NULL;
325 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
326 unsigned int inline_size = inline_xattr_size(inode);
327 int err;
328
329 if (!xnid && !inline_size)
330 return -ENODATA;
331
332 *base_size = XATTR_SIZE(inode) + XATTR_PADDING_SIZE;
333 txattr_addr = xattr_alloc(F2FS_I_SB(inode), *base_size, is_inline);
334 if (!txattr_addr)
335 return -ENOMEM;
336
337 last_txattr_addr = (void *)txattr_addr + XATTR_SIZE(inode);
338
339 /* read from inline xattr */
340 if (inline_size) {
341 err = read_inline_xattr(inode, ipage, txattr_addr);
342 if (err)
343 goto out;
344
345 *xe = __find_inline_xattr(inode, txattr_addr, &last_addr,
346 index, len, name);
347 if (*xe) {
348 *base_size = inline_size;
349 goto check;
350 }
351 }
352
353 /* read from xattr node block */
354 if (xnid) {
355 err = read_xattr_block(inode, txattr_addr);
356 if (err)
357 goto out;
358 }
359
360 if (last_addr)
361 cur_addr = XATTR_HDR(last_addr) - 1;
362 else
363 cur_addr = txattr_addr;
364
365 *xe = __find_xattr(cur_addr, last_txattr_addr, NULL, index, len, name);
366 if (!*xe) {
367 f2fs_err(F2FS_I_SB(inode), "lookup inode (%lu) has corrupted xattr",
368 inode->i_ino);
369 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
370 err = -ENODATA;
371 f2fs_handle_error(F2FS_I_SB(inode),
372 ERROR_CORRUPTED_XATTR);
373 goto out;
374 }
375 check:
376 if (IS_XATTR_LAST_ENTRY(*xe)) {
377 err = -ENODATA;
378 goto out;
379 }
380
381 *base_addr = txattr_addr;
382 return 0;
383 out:
384 xattr_free(F2FS_I_SB(inode), txattr_addr, *is_inline);
385 return err;
386 }
387
388 static int read_all_xattrs(struct inode *inode, struct page *ipage,
389 void **base_addr)
390 {
391 struct f2fs_xattr_header *header;
392 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
393 unsigned int size = VALID_XATTR_BLOCK_SIZE;
394 unsigned int inline_size = inline_xattr_size(inode);
395 void *txattr_addr;
396 int err;
397
398 txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode),
399 inline_size + size + XATTR_PADDING_SIZE, GFP_NOFS);
400 if (!txattr_addr)
401 return -ENOMEM;
402
403 /* read from inline xattr */
404 if (inline_size) {
405 err = read_inline_xattr(inode, ipage, txattr_addr);
406 if (err)
407 goto fail;
408 }
409
410 /* read from xattr node block */
411 if (xnid) {
412 err = read_xattr_block(inode, txattr_addr);
413 if (err)
414 goto fail;
415 }
416
417 header = XATTR_HDR(txattr_addr);
418
419 /* never been allocated xattrs */
420 if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
421 header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
422 header->h_refcount = cpu_to_le32(1);
423 }
424 *base_addr = txattr_addr;
425 return 0;
426 fail:
427 kfree(txattr_addr);
428 return err;
429 }
430
431 static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
432 void *txattr_addr, struct page *ipage)
433 {
434 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
435 size_t inline_size = inline_xattr_size(inode);
436 struct page *in_page = NULL;
437 void *xattr_addr;
438 void *inline_addr = NULL;
439 struct page *xpage;
440 nid_t new_nid = 0;
441 int err = 0;
442
443 if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
444 if (!f2fs_alloc_nid(sbi, &new_nid))
445 return -ENOSPC;
446
447 /* write to inline xattr */
448 if (inline_size) {
449 if (ipage) {
450 inline_addr = inline_xattr_addr(inode, ipage);
451 } else {
452 in_page = f2fs_get_node_page(sbi, inode->i_ino);
453 if (IS_ERR(in_page)) {
454 f2fs_alloc_nid_failed(sbi, new_nid);
455 return PTR_ERR(in_page);
456 }
457 inline_addr = inline_xattr_addr(inode, in_page);
458 }
459
460 f2fs_wait_on_page_writeback(ipage ? ipage : in_page,
461 NODE, true, true);
462 /* no need to use xattr node block */
463 if (hsize <= inline_size) {
464 err = f2fs_truncate_xattr_node(inode);
465 f2fs_alloc_nid_failed(sbi, new_nid);
466 if (err) {
467 f2fs_put_page(in_page, 1);
468 return err;
469 }
470 memcpy(inline_addr, txattr_addr, inline_size);
471 set_page_dirty(ipage ? ipage : in_page);
472 goto in_page_out;
473 }
474 }
475
476 /* write to xattr node block */
477 if (F2FS_I(inode)->i_xattr_nid) {
478 xpage = f2fs_get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
479 if (IS_ERR(xpage)) {
480 err = PTR_ERR(xpage);
481 f2fs_alloc_nid_failed(sbi, new_nid);
482 goto in_page_out;
483 }
484 f2fs_bug_on(sbi, new_nid);
485 f2fs_wait_on_page_writeback(xpage, NODE, true, true);
486 } else {
487 struct dnode_of_data dn;
488
489 set_new_dnode(&dn, inode, NULL, NULL, new_nid);
490 xpage = f2fs_new_node_page(&dn, XATTR_NODE_OFFSET);
491 if (IS_ERR(xpage)) {
492 err = PTR_ERR(xpage);
493 f2fs_alloc_nid_failed(sbi, new_nid);
494 goto in_page_out;
495 }
496 f2fs_alloc_nid_done(sbi, new_nid);
497 }
498 xattr_addr = page_address(xpage);
499
500 if (inline_size)
501 memcpy(inline_addr, txattr_addr, inline_size);
502 memcpy(xattr_addr, txattr_addr + inline_size, VALID_XATTR_BLOCK_SIZE);
503
504 if (inline_size)
505 set_page_dirty(ipage ? ipage : in_page);
506 set_page_dirty(xpage);
507
508 f2fs_put_page(xpage, 1);
509 in_page_out:
510 f2fs_put_page(in_page, 1);
511 return err;
512 }
513
514 int f2fs_getxattr(struct inode *inode, int index, const char *name,
515 void *buffer, size_t buffer_size, struct page *ipage)
516 {
517 struct f2fs_xattr_entry *entry = NULL;
518 int error;
519 unsigned int size, len;
520 void *base_addr = NULL;
521 int base_size;
522 bool is_inline;
523
524 if (name == NULL)
525 return -EINVAL;
526
527 len = strlen(name);
528 if (len > F2FS_NAME_LEN)
529 return -ERANGE;
530
531 if (!ipage)
532 f2fs_down_read(&F2FS_I(inode)->i_xattr_sem);
533 error = lookup_all_xattrs(inode, ipage, index, len, name,
534 &entry, &base_addr, &base_size, &is_inline);
535 if (!ipage)
536 f2fs_up_read(&F2FS_I(inode)->i_xattr_sem);
537 if (error)
538 return error;
539
540 size = le16_to_cpu(entry->e_value_size);
541
542 if (buffer && size > buffer_size) {
543 error = -ERANGE;
544 goto out;
545 }
546
547 if (buffer) {
548 char *pval = entry->e_name + entry->e_name_len;
549
550 if (base_size - (pval - (char *)base_addr) < size) {
551 error = -ERANGE;
552 goto out;
553 }
554 memcpy(buffer, pval, size);
555 }
556 error = size;
557 out:
558 xattr_free(F2FS_I_SB(inode), base_addr, is_inline);
559 return error;
560 }
561
562 ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
563 {
564 struct inode *inode = d_inode(dentry);
565 struct f2fs_xattr_entry *entry;
566 void *base_addr, *last_base_addr;
567 int error;
568 size_t rest = buffer_size;
569
570 f2fs_down_read(&F2FS_I(inode)->i_xattr_sem);
571 error = read_all_xattrs(inode, NULL, &base_addr);
572 f2fs_up_read(&F2FS_I(inode)->i_xattr_sem);
573 if (error)
574 return error;
575
576 last_base_addr = (void *)base_addr + XATTR_SIZE(inode);
577
578 list_for_each_xattr(entry, base_addr) {
579 const char *prefix;
580 size_t prefix_len;
581 size_t size;
582
583 prefix = f2fs_xattr_prefix(entry->e_name_index, dentry);
584
585 if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
586 (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) {
587 f2fs_err(F2FS_I_SB(inode), "list inode (%lu) has corrupted xattr",
588 inode->i_ino);
589 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
590 f2fs_handle_error(F2FS_I_SB(inode),
591 ERROR_CORRUPTED_XATTR);
592 break;
593 }
594
595 if (!prefix)
596 continue;
597
598 prefix_len = strlen(prefix);
599 size = prefix_len + entry->e_name_len + 1;
600 if (buffer) {
601 if (size > rest) {
602 error = -ERANGE;
603 goto cleanup;
604 }
605 memcpy(buffer, prefix, prefix_len);
606 buffer += prefix_len;
607 memcpy(buffer, entry->e_name, entry->e_name_len);
608 buffer += entry->e_name_len;
609 *buffer++ = 0;
610 }
611 rest -= size;
612 }
613 error = buffer_size - rest;
614 cleanup:
615 kfree(base_addr);
616 return error;
617 }
618
619 static bool f2fs_xattr_value_same(struct f2fs_xattr_entry *entry,
620 const void *value, size_t size)
621 {
622 void *pval = entry->e_name + entry->e_name_len;
623
624 return (le16_to_cpu(entry->e_value_size) == size) &&
625 !memcmp(pval, value, size);
626 }
627
628 static int __f2fs_setxattr(struct inode *inode, int index,
629 const char *name, const void *value, size_t size,
630 struct page *ipage, int flags)
631 {
632 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
633 struct f2fs_xattr_entry *here, *last;
634 void *base_addr, *last_base_addr;
635 int found, newsize;
636 size_t len;
637 __u32 new_hsize;
638 int error;
639
640 if (name == NULL)
641 return -EINVAL;
642
643 if (value == NULL)
644 size = 0;
645
646 len = strlen(name);
647
648 if (len > F2FS_NAME_LEN)
649 return -ERANGE;
650
651 if (size > MAX_VALUE_LEN(inode))
652 return -E2BIG;
653 retry:
654 error = read_all_xattrs(inode, ipage, &base_addr);
655 if (error)
656 return error;
657
658 last_base_addr = (void *)base_addr + XATTR_SIZE(inode);
659
660 /* find entry with wanted name. */
661 here = __find_xattr(base_addr, last_base_addr, NULL, index, len, name);
662 if (!here) {
663 if (!F2FS_I(inode)->i_xattr_nid) {
664 error = f2fs_recover_xattr_data(inode, NULL);
665 f2fs_notice(F2FS_I_SB(inode),
666 "recover xattr in inode (%lu), error(%d)",
667 inode->i_ino, error);
668 if (!error) {
669 kfree(base_addr);
670 goto retry;
671 }
672 }
673 f2fs_err(F2FS_I_SB(inode), "set inode (%lu) has corrupted xattr",
674 inode->i_ino);
675 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
676 error = -EFSCORRUPTED;
677 f2fs_handle_error(F2FS_I_SB(inode),
678 ERROR_CORRUPTED_XATTR);
679 goto exit;
680 }
681
682 found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
683
684 if (found) {
685 if ((flags & XATTR_CREATE)) {
686 error = -EEXIST;
687 goto exit;
688 }
689
690 if (value && f2fs_xattr_value_same(here, value, size))
691 goto same;
692 } else if ((flags & XATTR_REPLACE)) {
693 error = -ENODATA;
694 goto exit;
695 }
696
697 last = here;
698 while (!IS_XATTR_LAST_ENTRY(last)) {
699 if ((void *)(last) + sizeof(__u32) > last_base_addr ||
700 (void *)XATTR_NEXT_ENTRY(last) > last_base_addr) {
701 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has invalid last xattr entry, entry_size: %zu",
702 inode->i_ino, ENTRY_SIZE(last));
703 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
704 error = -EFSCORRUPTED;
705 f2fs_handle_error(F2FS_I_SB(inode),
706 ERROR_CORRUPTED_XATTR);
707 goto exit;
708 }
709 last = XATTR_NEXT_ENTRY(last);
710 }
711
712 newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
713
714 /* 1. Check space */
715 if (value) {
716 int free;
717 /*
718 * If value is NULL, it is remove operation.
719 * In case of update operation, we calculate free.
720 */
721 free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
722 if (found)
723 free = free + ENTRY_SIZE(here);
724
725 if (unlikely(free < newsize)) {
726 error = -E2BIG;
727 goto exit;
728 }
729 }
730
731 /* 2. Remove old entry */
732 if (found) {
733 /*
734 * If entry is found, remove old entry.
735 * If not found, remove operation is not needed.
736 */
737 struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
738 int oldsize = ENTRY_SIZE(here);
739
740 memmove(here, next, (char *)last - (char *)next);
741 last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
742 memset(last, 0, oldsize);
743 }
744
745 new_hsize = (char *)last - (char *)base_addr;
746
747 /* 3. Write new entry */
748 if (value) {
749 char *pval;
750 /*
751 * Before we come here, old entry is removed.
752 * We just write new entry.
753 */
754 last->e_name_index = index;
755 last->e_name_len = len;
756 memcpy(last->e_name, name, len);
757 pval = last->e_name + len;
758 memcpy(pval, value, size);
759 last->e_value_size = cpu_to_le16(size);
760 new_hsize += newsize;
761 /*
762 * Explicitly add the null terminator. The unused xattr space
763 * is supposed to always be zeroed, which would make this
764 * unnecessary, but don't depend on that.
765 */
766 *(u32 *)((u8 *)last + newsize) = 0;
767 }
768
769 error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
770 if (error)
771 goto exit;
772
773 if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
774 !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
775 f2fs_set_encrypted_inode(inode);
776
777 if (!S_ISDIR(inode->i_mode))
778 goto same;
779 /*
780 * In restrict mode, fsync() always try to trigger checkpoint for all
781 * metadata consistency, in other mode, it triggers checkpoint when
782 * parent's xattr metadata was updated.
783 */
784 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
785 set_sbi_flag(sbi, SBI_NEED_CP);
786 else
787 f2fs_add_ino_entry(sbi, inode->i_ino, XATTR_DIR_INO);
788 same:
789 if (is_inode_flag_set(inode, FI_ACL_MODE)) {
790 inode->i_mode = F2FS_I(inode)->i_acl_mode;
791 clear_inode_flag(inode, FI_ACL_MODE);
792 }
793
794 inode_set_ctime_current(inode);
795 f2fs_mark_inode_dirty_sync(inode, true);
796 exit:
797 kfree(base_addr);
798 return error;
799 }
800
801 int f2fs_setxattr(struct inode *inode, int index, const char *name,
802 const void *value, size_t size,
803 struct page *ipage, int flags)
804 {
805 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
806 int err;
807
808 if (unlikely(f2fs_cp_error(sbi)))
809 return -EIO;
810 if (!f2fs_is_checkpoint_ready(sbi))
811 return -ENOSPC;
812
813 err = f2fs_dquot_initialize(inode);
814 if (err)
815 return err;
816
817 /* this case is only from f2fs_init_inode_metadata */
818 if (ipage)
819 return __f2fs_setxattr(inode, index, name, value,
820 size, ipage, flags);
821 f2fs_balance_fs(sbi, true);
822
823 f2fs_lock_op(sbi);
824 f2fs_down_write(&F2FS_I(inode)->i_xattr_sem);
825 err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
826 f2fs_up_write(&F2FS_I(inode)->i_xattr_sem);
827 f2fs_unlock_op(sbi);
828
829 f2fs_update_time(sbi, REQ_TIME);
830 return err;
831 }
832
833 int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi)
834 {
835 dev_t dev = sbi->sb->s_bdev->bd_dev;
836 char slab_name[32];
837
838 sprintf(slab_name, "f2fs_xattr_entry-%u:%u", MAJOR(dev), MINOR(dev));
839
840 sbi->inline_xattr_slab_size = F2FS_OPTION(sbi).inline_xattr_size *
841 sizeof(__le32) + XATTR_PADDING_SIZE;
842
843 sbi->inline_xattr_slab = f2fs_kmem_cache_create(slab_name,
844 sbi->inline_xattr_slab_size);
845 if (!sbi->inline_xattr_slab)
846 return -ENOMEM;
847
848 return 0;
849 }
850
851 void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi)
852 {
853 kmem_cache_destroy(sbi->inline_xattr_slab);
854 }
855
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