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[mirror_ubuntu-jammy-kernel.git] / fs / f2fs / xattr.c
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 user_namespace *mnt_userns,
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 user_namespace *mnt_userns,
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(&init_user_ns, 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 *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] = &posix_acl_access_xattr_handler,
196 [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler,
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 *f2fs_xattr_handlers[] = {
206 &f2fs_xattr_user_handler,
207 #ifdef CONFIG_F2FS_FS_POSIX_ACL
208 &posix_acl_access_xattr_handler,
209 &posix_acl_default_xattr_handler,
210 #endif
211 &f2fs_xattr_trusted_handler,
212 #ifdef CONFIG_F2FS_FS_SECURITY
213 &f2fs_xattr_security_handler,
214 #endif
215 &f2fs_xattr_advise_handler,
216 NULL,
217 };
218
219 static inline const struct xattr_handler *f2fs_xattr_handler(int index)
220 {
221 const struct xattr_handler *handler = NULL;
222
223 if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map))
224 handler = f2fs_xattr_handler_map[index];
225 return handler;
226 }
227
228 static struct f2fs_xattr_entry *__find_xattr(void *base_addr,
229 void *last_base_addr, int index,
230 size_t len, const char *name)
231 {
232 struct f2fs_xattr_entry *entry;
233
234 list_for_each_xattr(entry, base_addr) {
235 if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
236 (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr)
237 return NULL;
238
239 if (entry->e_name_index != index)
240 continue;
241 if (entry->e_name_len != len)
242 continue;
243 if (!memcmp(entry->e_name, name, len))
244 break;
245 }
246 return entry;
247 }
248
249 static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode,
250 void *base_addr, void **last_addr, int index,
251 size_t len, const char *name)
252 {
253 struct f2fs_xattr_entry *entry;
254 unsigned int inline_size = inline_xattr_size(inode);
255 void *max_addr = base_addr + inline_size;
256
257 list_for_each_xattr(entry, base_addr) {
258 if ((void *)entry + sizeof(__u32) > max_addr ||
259 (void *)XATTR_NEXT_ENTRY(entry) > max_addr) {
260 *last_addr = entry;
261 return NULL;
262 }
263 if (entry->e_name_index != index)
264 continue;
265 if (entry->e_name_len != len)
266 continue;
267 if (!memcmp(entry->e_name, name, len))
268 break;
269 }
270
271 /* inline xattr header or entry across max inline xattr size */
272 if (IS_XATTR_LAST_ENTRY(entry) &&
273 (void *)entry + sizeof(__u32) > max_addr) {
274 *last_addr = entry;
275 return NULL;
276 }
277 return entry;
278 }
279
280 static int read_inline_xattr(struct inode *inode, struct page *ipage,
281 void *txattr_addr)
282 {
283 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
284 unsigned int inline_size = inline_xattr_size(inode);
285 struct page *page = NULL;
286 void *inline_addr;
287
288 if (ipage) {
289 inline_addr = inline_xattr_addr(inode, ipage);
290 } else {
291 page = f2fs_get_node_page(sbi, inode->i_ino);
292 if (IS_ERR(page))
293 return PTR_ERR(page);
294
295 inline_addr = inline_xattr_addr(inode, page);
296 }
297 memcpy(txattr_addr, inline_addr, inline_size);
298 f2fs_put_page(page, 1);
299
300 return 0;
301 }
302
303 static int read_xattr_block(struct inode *inode, void *txattr_addr)
304 {
305 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
306 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
307 unsigned int inline_size = inline_xattr_size(inode);
308 struct page *xpage;
309 void *xattr_addr;
310
311 /* The inode already has an extended attribute block. */
312 xpage = f2fs_get_node_page(sbi, xnid);
313 if (IS_ERR(xpage))
314 return PTR_ERR(xpage);
315
316 xattr_addr = page_address(xpage);
317 memcpy(txattr_addr + inline_size, xattr_addr, VALID_XATTR_BLOCK_SIZE);
318 f2fs_put_page(xpage, 1);
319
320 return 0;
321 }
322
323 static int lookup_all_xattrs(struct inode *inode, struct page *ipage,
324 unsigned int index, unsigned int len,
325 const char *name, struct f2fs_xattr_entry **xe,
326 void **base_addr, int *base_size,
327 bool *is_inline)
328 {
329 void *cur_addr, *txattr_addr, *last_txattr_addr;
330 void *last_addr = NULL;
331 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
332 unsigned int inline_size = inline_xattr_size(inode);
333 int err;
334
335 if (!xnid && !inline_size)
336 return -ENODATA;
337
338 *base_size = XATTR_SIZE(inode) + XATTR_PADDING_SIZE;
339 txattr_addr = xattr_alloc(F2FS_I_SB(inode), *base_size, is_inline);
340 if (!txattr_addr)
341 return -ENOMEM;
342
343 last_txattr_addr = (void *)txattr_addr + XATTR_SIZE(inode);
344
345 /* read from inline xattr */
346 if (inline_size) {
347 err = read_inline_xattr(inode, ipage, txattr_addr);
348 if (err)
349 goto out;
350
351 *xe = __find_inline_xattr(inode, txattr_addr, &last_addr,
352 index, len, name);
353 if (*xe) {
354 *base_size = inline_size;
355 goto check;
356 }
357 }
358
359 /* read from xattr node block */
360 if (xnid) {
361 err = read_xattr_block(inode, txattr_addr);
362 if (err)
363 goto out;
364 }
365
366 if (last_addr)
367 cur_addr = XATTR_HDR(last_addr) - 1;
368 else
369 cur_addr = txattr_addr;
370
371 *xe = __find_xattr(cur_addr, last_txattr_addr, index, len, name);
372 if (!*xe) {
373 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has corrupted xattr",
374 inode->i_ino);
375 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
376 err = -EFSCORRUPTED;
377 goto out;
378 }
379 check:
380 if (IS_XATTR_LAST_ENTRY(*xe)) {
381 err = -ENODATA;
382 goto out;
383 }
384
385 *base_addr = txattr_addr;
386 return 0;
387 out:
388 xattr_free(F2FS_I_SB(inode), txattr_addr, *is_inline);
389 return err;
390 }
391
392 static int read_all_xattrs(struct inode *inode, struct page *ipage,
393 void **base_addr)
394 {
395 struct f2fs_xattr_header *header;
396 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
397 unsigned int size = VALID_XATTR_BLOCK_SIZE;
398 unsigned int inline_size = inline_xattr_size(inode);
399 void *txattr_addr;
400 int err;
401
402 txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode),
403 inline_size + size + XATTR_PADDING_SIZE, GFP_NOFS);
404 if (!txattr_addr)
405 return -ENOMEM;
406
407 /* read from inline xattr */
408 if (inline_size) {
409 err = read_inline_xattr(inode, ipage, txattr_addr);
410 if (err)
411 goto fail;
412 }
413
414 /* read from xattr node block */
415 if (xnid) {
416 err = read_xattr_block(inode, txattr_addr);
417 if (err)
418 goto fail;
419 }
420
421 header = XATTR_HDR(txattr_addr);
422
423 /* never been allocated xattrs */
424 if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
425 header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
426 header->h_refcount = cpu_to_le32(1);
427 }
428 *base_addr = txattr_addr;
429 return 0;
430 fail:
431 kfree(txattr_addr);
432 return err;
433 }
434
435 static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
436 void *txattr_addr, struct page *ipage)
437 {
438 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
439 size_t inline_size = inline_xattr_size(inode);
440 struct page *in_page = NULL;
441 void *xattr_addr;
442 void *inline_addr = NULL;
443 struct page *xpage;
444 nid_t new_nid = 0;
445 int err = 0;
446
447 if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
448 if (!f2fs_alloc_nid(sbi, &new_nid))
449 return -ENOSPC;
450
451 /* write to inline xattr */
452 if (inline_size) {
453 if (ipage) {
454 inline_addr = inline_xattr_addr(inode, ipage);
455 } else {
456 in_page = f2fs_get_node_page(sbi, inode->i_ino);
457 if (IS_ERR(in_page)) {
458 f2fs_alloc_nid_failed(sbi, new_nid);
459 return PTR_ERR(in_page);
460 }
461 inline_addr = inline_xattr_addr(inode, in_page);
462 }
463
464 f2fs_wait_on_page_writeback(ipage ? ipage : in_page,
465 NODE, true, true);
466 /* no need to use xattr node block */
467 if (hsize <= inline_size) {
468 err = f2fs_truncate_xattr_node(inode);
469 f2fs_alloc_nid_failed(sbi, new_nid);
470 if (err) {
471 f2fs_put_page(in_page, 1);
472 return err;
473 }
474 memcpy(inline_addr, txattr_addr, inline_size);
475 set_page_dirty(ipage ? ipage : in_page);
476 goto in_page_out;
477 }
478 }
479
480 /* write to xattr node block */
481 if (F2FS_I(inode)->i_xattr_nid) {
482 xpage = f2fs_get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
483 if (IS_ERR(xpage)) {
484 err = PTR_ERR(xpage);
485 f2fs_alloc_nid_failed(sbi, new_nid);
486 goto in_page_out;
487 }
488 f2fs_bug_on(sbi, new_nid);
489 f2fs_wait_on_page_writeback(xpage, NODE, true, true);
490 } else {
491 struct dnode_of_data dn;
492
493 set_new_dnode(&dn, inode, NULL, NULL, new_nid);
494 xpage = f2fs_new_node_page(&dn, XATTR_NODE_OFFSET);
495 if (IS_ERR(xpage)) {
496 err = PTR_ERR(xpage);
497 f2fs_alloc_nid_failed(sbi, new_nid);
498 goto in_page_out;
499 }
500 f2fs_alloc_nid_done(sbi, new_nid);
501 }
502 xattr_addr = page_address(xpage);
503
504 if (inline_size)
505 memcpy(inline_addr, txattr_addr, inline_size);
506 memcpy(xattr_addr, txattr_addr + inline_size, VALID_XATTR_BLOCK_SIZE);
507
508 if (inline_size)
509 set_page_dirty(ipage ? ipage : in_page);
510 set_page_dirty(xpage);
511
512 f2fs_put_page(xpage, 1);
513 in_page_out:
514 f2fs_put_page(in_page, 1);
515 return err;
516 }
517
518 int f2fs_getxattr(struct inode *inode, int index, const char *name,
519 void *buffer, size_t buffer_size, struct page *ipage)
520 {
521 struct f2fs_xattr_entry *entry = NULL;
522 int error;
523 unsigned int size, len;
524 void *base_addr = NULL;
525 int base_size;
526 bool is_inline;
527
528 if (name == NULL)
529 return -EINVAL;
530
531 len = strlen(name);
532 if (len > F2FS_NAME_LEN)
533 return -ERANGE;
534
535 down_read(&F2FS_I(inode)->i_xattr_sem);
536 error = lookup_all_xattrs(inode, ipage, index, len, name,
537 &entry, &base_addr, &base_size, &is_inline);
538 up_read(&F2FS_I(inode)->i_xattr_sem);
539 if (error)
540 return error;
541
542 size = le16_to_cpu(entry->e_value_size);
543
544 if (buffer && size > buffer_size) {
545 error = -ERANGE;
546 goto out;
547 }
548
549 if (buffer) {
550 char *pval = entry->e_name + entry->e_name_len;
551
552 if (base_size - (pval - (char *)base_addr) < size) {
553 error = -ERANGE;
554 goto out;
555 }
556 memcpy(buffer, pval, size);
557 }
558 error = size;
559 out:
560 xattr_free(F2FS_I_SB(inode), base_addr, is_inline);
561 return error;
562 }
563
564 ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
565 {
566 struct inode *inode = d_inode(dentry);
567 struct f2fs_xattr_entry *entry;
568 void *base_addr, *last_base_addr;
569 int error;
570 size_t rest = buffer_size;
571
572 down_read(&F2FS_I(inode)->i_xattr_sem);
573 error = read_all_xattrs(inode, NULL, &base_addr);
574 up_read(&F2FS_I(inode)->i_xattr_sem);
575 if (error)
576 return error;
577
578 last_base_addr = (void *)base_addr + XATTR_SIZE(inode);
579
580 list_for_each_xattr(entry, base_addr) {
581 const struct xattr_handler *handler =
582 f2fs_xattr_handler(entry->e_name_index);
583 const char *prefix;
584 size_t prefix_len;
585 size_t size;
586
587 if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
588 (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) {
589 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has corrupted xattr",
590 inode->i_ino);
591 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
592 error = -EFSCORRUPTED;
593 goto cleanup;
594 }
595
596 if (!handler || (handler->list && !handler->list(dentry)))
597 continue;
598
599 prefix = xattr_prefix(handler);
600 prefix_len = strlen(prefix);
601 size = prefix_len + entry->e_name_len + 1;
602 if (buffer) {
603 if (size > rest) {
604 error = -ERANGE;
605 goto cleanup;
606 }
607 memcpy(buffer, prefix, prefix_len);
608 buffer += prefix_len;
609 memcpy(buffer, entry->e_name, entry->e_name_len);
610 buffer += entry->e_name_len;
611 *buffer++ = 0;
612 }
613 rest -= size;
614 }
615 error = buffer_size - rest;
616 cleanup:
617 kfree(base_addr);
618 return error;
619 }
620
621 static bool f2fs_xattr_value_same(struct f2fs_xattr_entry *entry,
622 const void *value, size_t size)
623 {
624 void *pval = entry->e_name + entry->e_name_len;
625
626 return (le16_to_cpu(entry->e_value_size) == size) &&
627 !memcmp(pval, value, size);
628 }
629
630 static int __f2fs_setxattr(struct inode *inode, int index,
631 const char *name, const void *value, size_t size,
632 struct page *ipage, int flags)
633 {
634 struct f2fs_xattr_entry *here, *last;
635 void *base_addr, *last_base_addr;
636 int found, newsize;
637 size_t len;
638 __u32 new_hsize;
639 int error;
640
641 if (name == NULL)
642 return -EINVAL;
643
644 if (value == NULL)
645 size = 0;
646
647 len = strlen(name);
648
649 if (len > F2FS_NAME_LEN)
650 return -ERANGE;
651
652 if (size > MAX_VALUE_LEN(inode))
653 return -E2BIG;
654
655 error = read_all_xattrs(inode, ipage, &base_addr);
656 if (error)
657 return error;
658
659 last_base_addr = (void *)base_addr + XATTR_SIZE(inode);
660
661 /* find entry with wanted name. */
662 here = __find_xattr(base_addr, last_base_addr, index, len, name);
663 if (!here) {
664 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has corrupted xattr",
665 inode->i_ino);
666 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
667 error = -EFSCORRUPTED;
668 goto exit;
669 }
670
671 found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
672
673 if (found) {
674 if ((flags & XATTR_CREATE)) {
675 error = -EEXIST;
676 goto exit;
677 }
678
679 if (value && f2fs_xattr_value_same(here, value, size))
680 goto same;
681 } else if ((flags & XATTR_REPLACE)) {
682 error = -ENODATA;
683 goto exit;
684 }
685
686 last = here;
687 while (!IS_XATTR_LAST_ENTRY(last)) {
688 if ((void *)(last) + sizeof(__u32) > last_base_addr ||
689 (void *)XATTR_NEXT_ENTRY(last) > last_base_addr) {
690 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has invalid last xattr entry, entry_size: %zu",
691 inode->i_ino, ENTRY_SIZE(last));
692 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
693 error = -EFSCORRUPTED;
694 goto exit;
695 }
696 last = XATTR_NEXT_ENTRY(last);
697 }
698
699 newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
700
701 /* 1. Check space */
702 if (value) {
703 int free;
704 /*
705 * If value is NULL, it is remove operation.
706 * In case of update operation, we calculate free.
707 */
708 free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
709 if (found)
710 free = free + ENTRY_SIZE(here);
711
712 if (unlikely(free < newsize)) {
713 error = -E2BIG;
714 goto exit;
715 }
716 }
717
718 /* 2. Remove old entry */
719 if (found) {
720 /*
721 * If entry is found, remove old entry.
722 * If not found, remove operation is not needed.
723 */
724 struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
725 int oldsize = ENTRY_SIZE(here);
726
727 memmove(here, next, (char *)last - (char *)next);
728 last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
729 memset(last, 0, oldsize);
730 }
731
732 new_hsize = (char *)last - (char *)base_addr;
733
734 /* 3. Write new entry */
735 if (value) {
736 char *pval;
737 /*
738 * Before we come here, old entry is removed.
739 * We just write new entry.
740 */
741 last->e_name_index = index;
742 last->e_name_len = len;
743 memcpy(last->e_name, name, len);
744 pval = last->e_name + len;
745 memcpy(pval, value, size);
746 last->e_value_size = cpu_to_le16(size);
747 new_hsize += newsize;
748 }
749
750 error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
751 if (error)
752 goto exit;
753
754 if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
755 !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
756 f2fs_set_encrypted_inode(inode);
757 f2fs_mark_inode_dirty_sync(inode, true);
758 if (!error && S_ISDIR(inode->i_mode))
759 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP);
760
761 same:
762 if (is_inode_flag_set(inode, FI_ACL_MODE)) {
763 inode->i_mode = F2FS_I(inode)->i_acl_mode;
764 inode->i_ctime = current_time(inode);
765 clear_inode_flag(inode, FI_ACL_MODE);
766 }
767
768 exit:
769 kfree(base_addr);
770 return error;
771 }
772
773 int f2fs_setxattr(struct inode *inode, int index, const char *name,
774 const void *value, size_t size,
775 struct page *ipage, int flags)
776 {
777 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
778 int err;
779
780 if (unlikely(f2fs_cp_error(sbi)))
781 return -EIO;
782 if (!f2fs_is_checkpoint_ready(sbi))
783 return -ENOSPC;
784
785 err = dquot_initialize(inode);
786 if (err)
787 return err;
788
789 /* this case is only from f2fs_init_inode_metadata */
790 if (ipage)
791 return __f2fs_setxattr(inode, index, name, value,
792 size, ipage, flags);
793 f2fs_balance_fs(sbi, true);
794
795 f2fs_lock_op(sbi);
796 down_write(&F2FS_I(inode)->i_xattr_sem);
797 err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
798 up_write(&F2FS_I(inode)->i_xattr_sem);
799 f2fs_unlock_op(sbi);
800
801 f2fs_update_time(sbi, REQ_TIME);
802 return err;
803 }
804
805 int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi)
806 {
807 dev_t dev = sbi->sb->s_bdev->bd_dev;
808 char slab_name[32];
809
810 sprintf(slab_name, "f2fs_xattr_entry-%u:%u", MAJOR(dev), MINOR(dev));
811
812 sbi->inline_xattr_slab_size = F2FS_OPTION(sbi).inline_xattr_size *
813 sizeof(__le32) + XATTR_PADDING_SIZE;
814
815 sbi->inline_xattr_slab = f2fs_kmem_cache_create(slab_name,
816 sbi->inline_xattr_slab_size);
817 if (!sbi->inline_xattr_slab)
818 return -ENOMEM;
819
820 return 0;
821 }
822
823 void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi)
824 {
825 kmem_cache_destroy(sbi->inline_xattr_slab);
826 }
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