?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
media: stv06xx: add missing descriptor sanity checks
[linux/fpc-iii.git] / fs / f2fs / xattr.c
blob296b3189448a466c2177ace3d0423f1f31f2162b
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 int f2fs_xattr_generic_get(const struct xattr_handler *handler,
27 struct dentry *unused, struct inode *inode,
28 const char *name, void *buffer, size_t size)
29 {
30 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
31
32 switch (handler->flags) {
33 case F2FS_XATTR_INDEX_USER:
34 if (!test_opt(sbi, XATTR_USER))
35 return -EOPNOTSUPP;
36 break;
37 case F2FS_XATTR_INDEX_TRUSTED:
38 case F2FS_XATTR_INDEX_SECURITY:
39 break;
40 default:
41 return -EINVAL;
42 }
43 return f2fs_getxattr(inode, handler->flags, name,
44 buffer, size, NULL);
45 }
46
47 static int f2fs_xattr_generic_set(const struct xattr_handler *handler,
48 struct dentry *unused, struct inode *inode,
49 const char *name, const void *value,
50 size_t size, int flags)
51 {
52 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
53
54 switch (handler->flags) {
55 case F2FS_XATTR_INDEX_USER:
56 if (!test_opt(sbi, XATTR_USER))
57 return -EOPNOTSUPP;
58 break;
59 case F2FS_XATTR_INDEX_TRUSTED:
60 case F2FS_XATTR_INDEX_SECURITY:
61 break;
62 default:
63 return -EINVAL;
64 }
65 return f2fs_setxattr(inode, handler->flags, name,
66 value, size, NULL, flags);
67 }
68
69 static bool f2fs_xattr_user_list(struct dentry *dentry)
70 {
71 struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
72
73 return test_opt(sbi, XATTR_USER);
74 }
75
76 static bool f2fs_xattr_trusted_list(struct dentry *dentry)
77 {
78 return capable(CAP_SYS_ADMIN);
79 }
80
81 static int f2fs_xattr_advise_get(const struct xattr_handler *handler,
82 struct dentry *unused, struct inode *inode,
83 const char *name, void *buffer, size_t size)
84 {
85 if (buffer)
86 *((char *)buffer) = F2FS_I(inode)->i_advise;
87 return sizeof(char);
88 }
89
90 static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
91 struct dentry *unused, struct inode *inode,
92 const char *name, const void *value,
93 size_t size, int flags)
94 {
95 unsigned char old_advise = F2FS_I(inode)->i_advise;
96 unsigned char new_advise;
97
98 if (!inode_owner_or_capable(inode))
99 return -EPERM;
100 if (value == NULL)
101 return -EINVAL;
102
103 new_advise = *(char *)value;
104 if (new_advise & ~FADVISE_MODIFIABLE_BITS)
105 return -EINVAL;
106
107 new_advise = new_advise & FADVISE_MODIFIABLE_BITS;
108 new_advise |= old_advise & ~FADVISE_MODIFIABLE_BITS;
109
110 F2FS_I(inode)->i_advise = new_advise;
111 f2fs_mark_inode_dirty_sync(inode, true);
112 return 0;
113 }
114
115 #ifdef CONFIG_F2FS_FS_SECURITY
116 static int f2fs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
117 void *page)
118 {
119 const struct xattr *xattr;
120 int err = 0;
121
122 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
123 err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY,
124 xattr->name, xattr->value,
125 xattr->value_len, (struct page *)page, 0);
126 if (err < 0)
127 break;
128 }
129 return err;
130 }
131
132 int f2fs_init_security(struct inode *inode, struct inode *dir,
133 const struct qstr *qstr, struct page *ipage)
134 {
135 return security_inode_init_security(inode, dir, qstr,
136 &f2fs_initxattrs, ipage);
137 }
138 #endif
139
140 const struct xattr_handler f2fs_xattr_user_handler = {
141 .prefix = XATTR_USER_PREFIX,
142 .flags = F2FS_XATTR_INDEX_USER,
143 .list = f2fs_xattr_user_list,
144 .get = f2fs_xattr_generic_get,
145 .set = f2fs_xattr_generic_set,
146 };
147
148 const struct xattr_handler f2fs_xattr_trusted_handler = {
149 .prefix = XATTR_TRUSTED_PREFIX,
150 .flags = F2FS_XATTR_INDEX_TRUSTED,
151 .list = f2fs_xattr_trusted_list,
152 .get = f2fs_xattr_generic_get,
153 .set = f2fs_xattr_generic_set,
154 };
155
156 const struct xattr_handler f2fs_xattr_advise_handler = {
157 .name = F2FS_SYSTEM_ADVISE_NAME,
158 .flags = F2FS_XATTR_INDEX_ADVISE,
159 .get = f2fs_xattr_advise_get,
160 .set = f2fs_xattr_advise_set,
161 };
162
163 const struct xattr_handler f2fs_xattr_security_handler = {
164 .prefix = XATTR_SECURITY_PREFIX,
165 .flags = F2FS_XATTR_INDEX_SECURITY,
166 .get = f2fs_xattr_generic_get,
167 .set = f2fs_xattr_generic_set,
168 };
169
170 static const struct xattr_handler *f2fs_xattr_handler_map[] = {
171 [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
172 #ifdef CONFIG_F2FS_FS_POSIX_ACL
173 [F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
174 [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler,
175 #endif
176 [F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
177 #ifdef CONFIG_F2FS_FS_SECURITY
178 [F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
179 #endif
180 [F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
181 };
182
183 const struct xattr_handler *f2fs_xattr_handlers[] = {
184 &f2fs_xattr_user_handler,
185 #ifdef CONFIG_F2FS_FS_POSIX_ACL
186 &posix_acl_access_xattr_handler,
187 &posix_acl_default_xattr_handler,
188 #endif
189 &f2fs_xattr_trusted_handler,
190 #ifdef CONFIG_F2FS_FS_SECURITY
191 &f2fs_xattr_security_handler,
192 #endif
193 &f2fs_xattr_advise_handler,
194 NULL,
195 };
196
197 static inline const struct xattr_handler *f2fs_xattr_handler(int index)
198 {
199 const struct xattr_handler *handler = NULL;
200
201 if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map))
202 handler = f2fs_xattr_handler_map[index];
203 return handler;
204 }
205
206 static struct f2fs_xattr_entry *__find_xattr(void *base_addr,
207 void *last_base_addr, int index,
208 size_t len, const char *name)
209 {
210 struct f2fs_xattr_entry *entry;
211
212 list_for_each_xattr(entry, base_addr) {
213 if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
214 (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr)
215 return NULL;
216
217 if (entry->e_name_index != index)
218 continue;
219 if (entry->e_name_len != len)
220 continue;
221 if (!memcmp(entry->e_name, name, len))
222 break;
223 }
224 return entry;
225 }
226
227 static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode,
228 void *base_addr, void **last_addr, int index,
229 size_t len, const char *name)
230 {
231 struct f2fs_xattr_entry *entry;
232 unsigned int inline_size = inline_xattr_size(inode);
233 void *max_addr = base_addr + inline_size;
234
235 list_for_each_xattr(entry, base_addr) {
236 if ((void *)entry + sizeof(__u32) > max_addr ||
237 (void *)XATTR_NEXT_ENTRY(entry) > max_addr) {
238 *last_addr = entry;
239 return NULL;
240 }
241 if (entry->e_name_index != index)
242 continue;
243 if (entry->e_name_len != len)
244 continue;
245 if (!memcmp(entry->e_name, name, len))
246 break;
247 }
248
249 /* inline xattr header or entry across max inline xattr size */
250 if (IS_XATTR_LAST_ENTRY(entry) &&
251 (void *)entry + sizeof(__u32) > max_addr) {
252 *last_addr = entry;
253 return NULL;
254 }
255 return entry;
256 }
257
258 static int read_inline_xattr(struct inode *inode, struct page *ipage,
259 void *txattr_addr)
260 {
261 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
262 unsigned int inline_size = inline_xattr_size(inode);
263 struct page *page = NULL;
264 void *inline_addr;
265
266 if (ipage) {
267 inline_addr = inline_xattr_addr(inode, ipage);
268 } else {
269 page = f2fs_get_node_page(sbi, inode->i_ino);
270 if (IS_ERR(page))
271 return PTR_ERR(page);
272
273 inline_addr = inline_xattr_addr(inode, page);
274 }
275 memcpy(txattr_addr, inline_addr, inline_size);
276 f2fs_put_page(page, 1);
277
278 return 0;
279 }
280
281 static int read_xattr_block(struct inode *inode, void *txattr_addr)
282 {
283 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
284 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
285 unsigned int inline_size = inline_xattr_size(inode);
286 struct page *xpage;
287 void *xattr_addr;
288
289 /* The inode already has an extended attribute block. */
290 xpage = f2fs_get_node_page(sbi, xnid);
291 if (IS_ERR(xpage))
292 return PTR_ERR(xpage);
293
294 xattr_addr = page_address(xpage);
295 memcpy(txattr_addr + inline_size, xattr_addr, VALID_XATTR_BLOCK_SIZE);
296 f2fs_put_page(xpage, 1);
297
298 return 0;
299 }
300
301 static int lookup_all_xattrs(struct inode *inode, struct page *ipage,
302 unsigned int index, unsigned int len,
303 const char *name, struct f2fs_xattr_entry **xe,
304 void **base_addr, int *base_size)
305 {
306 void *cur_addr, *txattr_addr, *last_txattr_addr;
307 void *last_addr = NULL;
308 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
309 unsigned int inline_size = inline_xattr_size(inode);
310 int err = 0;
311
312 if (!xnid && !inline_size)
313 return -ENODATA;
314
315 *base_size = XATTR_SIZE(xnid, inode) + XATTR_PADDING_SIZE;
316 txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode), *base_size, GFP_NOFS);
317 if (!txattr_addr)
318 return -ENOMEM;
319
320 last_txattr_addr = (void *)txattr_addr + XATTR_SIZE(xnid, inode);
321
322 /* read from inline xattr */
323 if (inline_size) {
324 err = read_inline_xattr(inode, ipage, txattr_addr);
325 if (err)
326 goto out;
327
328 *xe = __find_inline_xattr(inode, txattr_addr, &last_addr,
329 index, len, name);
330 if (*xe) {
331 *base_size = inline_size;
332 goto check;
333 }
334 }
335
336 /* read from xattr node block */
337 if (xnid) {
338 err = read_xattr_block(inode, txattr_addr);
339 if (err)
340 goto out;
341 }
342
343 if (last_addr)
344 cur_addr = XATTR_HDR(last_addr) - 1;
345 else
346 cur_addr = txattr_addr;
347
348 *xe = __find_xattr(cur_addr, last_txattr_addr, index, len, name);
349 if (!*xe) {
350 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has corrupted xattr",
351 inode->i_ino);
352 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
353 err = -EFSCORRUPTED;
354 goto out;
355 }
356 check:
357 if (IS_XATTR_LAST_ENTRY(*xe)) {
358 err = -ENODATA;
359 goto out;
360 }
361
362 *base_addr = txattr_addr;
363 return 0;
364 out:
365 kvfree(txattr_addr);
366 return err;
367 }
368
369 static int read_all_xattrs(struct inode *inode, struct page *ipage,
370 void **base_addr)
371 {
372 struct f2fs_xattr_header *header;
373 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
374 unsigned int size = VALID_XATTR_BLOCK_SIZE;
375 unsigned int inline_size = inline_xattr_size(inode);
376 void *txattr_addr;
377 int err;
378
379 txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode),
380 inline_size + size + XATTR_PADDING_SIZE, GFP_NOFS);
381 if (!txattr_addr)
382 return -ENOMEM;
383
384 /* read from inline xattr */
385 if (inline_size) {
386 err = read_inline_xattr(inode, ipage, txattr_addr);
387 if (err)
388 goto fail;
389 }
390
391 /* read from xattr node block */
392 if (xnid) {
393 err = read_xattr_block(inode, txattr_addr);
394 if (err)
395 goto fail;
396 }
397
398 header = XATTR_HDR(txattr_addr);
399
400 /* never been allocated xattrs */
401 if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
402 header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
403 header->h_refcount = cpu_to_le32(1);
404 }
405 *base_addr = txattr_addr;
406 return 0;
407 fail:
408 kvfree(txattr_addr);
409 return err;
410 }
411
412 static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
413 void *txattr_addr, struct page *ipage)
414 {
415 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
416 size_t inline_size = inline_xattr_size(inode);
417 struct page *in_page = NULL;
418 void *xattr_addr;
419 void *inline_addr = NULL;
420 struct page *xpage;
421 nid_t new_nid = 0;
422 int err = 0;
423
424 if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
425 if (!f2fs_alloc_nid(sbi, &new_nid))
426 return -ENOSPC;
427
428 /* write to inline xattr */
429 if (inline_size) {
430 if (ipage) {
431 inline_addr = inline_xattr_addr(inode, ipage);
432 } else {
433 in_page = f2fs_get_node_page(sbi, inode->i_ino);
434 if (IS_ERR(in_page)) {
435 f2fs_alloc_nid_failed(sbi, new_nid);
436 return PTR_ERR(in_page);
437 }
438 inline_addr = inline_xattr_addr(inode, in_page);
439 }
440
441 f2fs_wait_on_page_writeback(ipage ? ipage : in_page,
442 NODE, true, true);
443 /* no need to use xattr node block */
444 if (hsize <= inline_size) {
445 err = f2fs_truncate_xattr_node(inode);
446 f2fs_alloc_nid_failed(sbi, new_nid);
447 if (err) {
448 f2fs_put_page(in_page, 1);
449 return err;
450 }
451 memcpy(inline_addr, txattr_addr, inline_size);
452 set_page_dirty(ipage ? ipage : in_page);
453 goto in_page_out;
454 }
455 }
456
457 /* write to xattr node block */
458 if (F2FS_I(inode)->i_xattr_nid) {
459 xpage = f2fs_get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
460 if (IS_ERR(xpage)) {
461 err = PTR_ERR(xpage);
462 f2fs_alloc_nid_failed(sbi, new_nid);
463 goto in_page_out;
464 }
465 f2fs_bug_on(sbi, new_nid);
466 f2fs_wait_on_page_writeback(xpage, NODE, true, true);
467 } else {
468 struct dnode_of_data dn;
469 set_new_dnode(&dn, inode, NULL, NULL, new_nid);
470 xpage = f2fs_new_node_page(&dn, XATTR_NODE_OFFSET);
471 if (IS_ERR(xpage)) {
472 err = PTR_ERR(xpage);
473 f2fs_alloc_nid_failed(sbi, new_nid);
474 goto in_page_out;
475 }
476 f2fs_alloc_nid_done(sbi, new_nid);
477 }
478 xattr_addr = page_address(xpage);
479
480 if (inline_size)
481 memcpy(inline_addr, txattr_addr, inline_size);
482 memcpy(xattr_addr, txattr_addr + inline_size, VALID_XATTR_BLOCK_SIZE);
483
484 if (inline_size)
485 set_page_dirty(ipage ? ipage : in_page);
486 set_page_dirty(xpage);
487
488 f2fs_put_page(xpage, 1);
489 in_page_out:
490 f2fs_put_page(in_page, 1);
491 return err;
492 }
493
494 int f2fs_getxattr(struct inode *inode, int index, const char *name,
495 void *buffer, size_t buffer_size, struct page *ipage)
496 {
497 struct f2fs_xattr_entry *entry = NULL;
498 int error = 0;
499 unsigned int size, len;
500 void *base_addr = NULL;
501 int base_size;
502
503 if (name == NULL)
504 return -EINVAL;
505
506 len = strlen(name);
507 if (len > F2FS_NAME_LEN)
508 return -ERANGE;
509
510 down_read(&F2FS_I(inode)->i_xattr_sem);
511 error = lookup_all_xattrs(inode, ipage, index, len, name,
512 &entry, &base_addr, &base_size);
513 up_read(&F2FS_I(inode)->i_xattr_sem);
514 if (error)
515 return error;
516
517 size = le16_to_cpu(entry->e_value_size);
518
519 if (buffer && size > buffer_size) {
520 error = -ERANGE;
521 goto out;
522 }
523
524 if (buffer) {
525 char *pval = entry->e_name + entry->e_name_len;
526
527 if (base_size - (pval - (char *)base_addr) < size) {
528 error = -ERANGE;
529 goto out;
530 }
531 memcpy(buffer, pval, size);
532 }
533 error = size;
534 out:
535 kvfree(base_addr);
536 return error;
537 }
538
539 ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
540 {
541 struct inode *inode = d_inode(dentry);
542 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
543 struct f2fs_xattr_entry *entry;
544 void *base_addr, *last_base_addr;
545 int error = 0;
546 size_t rest = buffer_size;
547
548 down_read(&F2FS_I(inode)->i_xattr_sem);
549 error = read_all_xattrs(inode, NULL, &base_addr);
550 up_read(&F2FS_I(inode)->i_xattr_sem);
551 if (error)
552 return error;
553
554 last_base_addr = (void *)base_addr + XATTR_SIZE(xnid, inode);
555
556 list_for_each_xattr(entry, base_addr) {
557 const struct xattr_handler *handler =
558 f2fs_xattr_handler(entry->e_name_index);
559 const char *prefix;
560 size_t prefix_len;
561 size_t size;
562
563 if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
564 (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) {
565 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has corrupted xattr",
566 inode->i_ino);
567 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
568 error = -EFSCORRUPTED;
569 goto cleanup;
570 }
571
572 if (!handler || (handler->list && !handler->list(dentry)))
573 continue;
574
575 prefix = xattr_prefix(handler);
576 prefix_len = strlen(prefix);
577 size = prefix_len + entry->e_name_len + 1;
578 if (buffer) {
579 if (size > rest) {
580 error = -ERANGE;
581 goto cleanup;
582 }
583 memcpy(buffer, prefix, prefix_len);
584 buffer += prefix_len;
585 memcpy(buffer, entry->e_name, entry->e_name_len);
586 buffer += entry->e_name_len;
587 *buffer++ = 0;
588 }
589 rest -= size;
590 }
591 error = buffer_size - rest;
592 cleanup:
593 kvfree(base_addr);
594 return error;
595 }
596
597 static bool f2fs_xattr_value_same(struct f2fs_xattr_entry *entry,
598 const void *value, size_t size)
599 {
600 void *pval = entry->e_name + entry->e_name_len;
601
602 return (le16_to_cpu(entry->e_value_size) == size) &&
603 !memcmp(pval, value, size);
604 }
605
606 static int __f2fs_setxattr(struct inode *inode, int index,
607 const char *name, const void *value, size_t size,
608 struct page *ipage, int flags)
609 {
610 struct f2fs_xattr_entry *here, *last;
611 void *base_addr, *last_base_addr;
612 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
613 int found, newsize;
614 size_t len;
615 __u32 new_hsize;
616 int error = 0;
617
618 if (name == NULL)
619 return -EINVAL;
620
621 if (value == NULL)
622 size = 0;
623
624 len = strlen(name);
625
626 if (len > F2FS_NAME_LEN)
627 return -ERANGE;
628
629 if (size > MAX_VALUE_LEN(inode))
630 return -E2BIG;
631
632 error = read_all_xattrs(inode, ipage, &base_addr);
633 if (error)
634 return error;
635
636 last_base_addr = (void *)base_addr + XATTR_SIZE(xnid, inode);
637
638 /* find entry with wanted name. */
639 here = __find_xattr(base_addr, last_base_addr, index, len, name);
640 if (!here) {
641 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has corrupted xattr",
642 inode->i_ino);
643 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
644 error = -EFSCORRUPTED;
645 goto exit;
646 }
647
648 found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
649
650 if (found) {
651 if ((flags & XATTR_CREATE)) {
652 error = -EEXIST;
653 goto exit;
654 }
655
656 if (value && f2fs_xattr_value_same(here, value, size))
657 goto exit;
658 } else if ((flags & XATTR_REPLACE)) {
659 error = -ENODATA;
660 goto exit;
661 }
662
663 last = here;
664 while (!IS_XATTR_LAST_ENTRY(last))
665 last = XATTR_NEXT_ENTRY(last);
666
667 newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
668
669 /* 1. Check space */
670 if (value) {
671 int free;
672 /*
673 * If value is NULL, it is remove operation.
674 * In case of update operation, we calculate free.
675 */
676 free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
677 if (found)
678 free = free + ENTRY_SIZE(here);
679
680 if (unlikely(free < newsize)) {
681 error = -E2BIG;
682 goto exit;
683 }
684 }
685
686 /* 2. Remove old entry */
687 if (found) {
688 /*
689 * If entry is found, remove old entry.
690 * If not found, remove operation is not needed.
691 */
692 struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
693 int oldsize = ENTRY_SIZE(here);
694
695 memmove(here, next, (char *)last - (char *)next);
696 last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
697 memset(last, 0, oldsize);
698 }
699
700 new_hsize = (char *)last - (char *)base_addr;
701
702 /* 3. Write new entry */
703 if (value) {
704 char *pval;
705 /*
706 * Before we come here, old entry is removed.
707 * We just write new entry.
708 */
709 last->e_name_index = index;
710 last->e_name_len = len;
711 memcpy(last->e_name, name, len);
712 pval = last->e_name + len;
713 memcpy(pval, value, size);
714 last->e_value_size = cpu_to_le16(size);
715 new_hsize += newsize;
716 }
717
718 error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
719 if (error)
720 goto exit;
721
722 if (is_inode_flag_set(inode, FI_ACL_MODE)) {
723 inode->i_mode = F2FS_I(inode)->i_acl_mode;
724 inode->i_ctime = current_time(inode);
725 clear_inode_flag(inode, FI_ACL_MODE);
726 }
727 if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
728 !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
729 f2fs_set_encrypted_inode(inode);
730 f2fs_mark_inode_dirty_sync(inode, true);
731 if (!error && S_ISDIR(inode->i_mode))
732 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP);
733 exit:
734 kvfree(base_addr);
735 return error;
736 }
737
738 int f2fs_setxattr(struct inode *inode, int index, const char *name,
739 const void *value, size_t size,
740 struct page *ipage, int flags)
741 {
742 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
743 int err;
744
745 if (unlikely(f2fs_cp_error(sbi)))
746 return -EIO;
747 if (!f2fs_is_checkpoint_ready(sbi))
748 return -ENOSPC;
749
750 err = dquot_initialize(inode);
751 if (err)
752 return err;
753
754 /* this case is only from f2fs_init_inode_metadata */
755 if (ipage)
756 return __f2fs_setxattr(inode, index, name, value,
757 size, ipage, flags);
758 f2fs_balance_fs(sbi, true);
759
760 f2fs_lock_op(sbi);
761 /* protect xattr_ver */
762 down_write(&F2FS_I(inode)->i_sem);
763 down_write(&F2FS_I(inode)->i_xattr_sem);
764 err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
765 up_write(&F2FS_I(inode)->i_xattr_sem);
766 up_write(&F2FS_I(inode)->i_sem);
767 f2fs_unlock_op(sbi);
768
769 f2fs_update_time(sbi, REQ_TIME);
770 return err;
771 }
Linux with added FPC-III support