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
f2fs_xattr_generic_get(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * buffer,size_t size)25 static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
26 struct dentry *unused, struct inode *inode,
27 const char *name, void *buffer, size_t size)
28 {
29 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
30
31 switch (handler->flags) {
32 case F2FS_XATTR_INDEX_USER:
33 if (!test_opt(sbi, XATTR_USER))
34 return -EOPNOTSUPP;
35 break;
36 case F2FS_XATTR_INDEX_TRUSTED:
37 case F2FS_XATTR_INDEX_SECURITY:
38 break;
39 default:
40 return -EINVAL;
41 }
42 return f2fs_getxattr(inode, handler->flags, name,
43 buffer, size, NULL);
44 }
45
f2fs_xattr_generic_set(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,const void * value,size_t size,int flags)46 static int f2fs_xattr_generic_set(const struct xattr_handler *handler,
47 struct dentry *unused, struct inode *inode,
48 const char *name, const void *value,
49 size_t size, int flags)
50 {
51 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
52
53 switch (handler->flags) {
54 case F2FS_XATTR_INDEX_USER:
55 if (!test_opt(sbi, XATTR_USER))
56 return -EOPNOTSUPP;
57 break;
58 case F2FS_XATTR_INDEX_TRUSTED:
59 case F2FS_XATTR_INDEX_SECURITY:
60 break;
61 default:
62 return -EINVAL;
63 }
64 return f2fs_setxattr(inode, handler->flags, name,
65 value, size, NULL, flags);
66 }
67
f2fs_xattr_user_list(struct dentry * dentry)68 static bool f2fs_xattr_user_list(struct dentry *dentry)
69 {
70 struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
71
72 return test_opt(sbi, XATTR_USER);
73 }
74
f2fs_xattr_trusted_list(struct dentry * dentry)75 static bool f2fs_xattr_trusted_list(struct dentry *dentry)
76 {
77 return capable(CAP_SYS_ADMIN);
78 }
79
f2fs_xattr_advise_get(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * buffer,size_t size)80 static int f2fs_xattr_advise_get(const struct xattr_handler *handler,
81 struct dentry *unused, struct inode *inode,
82 const char *name, void *buffer, size_t size)
83 {
84 if (buffer)
85 *((char *)buffer) = F2FS_I(inode)->i_advise;
86 return sizeof(char);
87 }
88
f2fs_xattr_advise_set(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,const void * value,size_t size,int flags)89 static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
90 struct dentry *unused, struct inode *inode,
91 const char *name, const void *value,
92 size_t size, int flags)
93 {
94 unsigned char old_advise = F2FS_I(inode)->i_advise;
95 unsigned char new_advise;
96
97 if (!inode_owner_or_capable(inode))
98 return -EPERM;
99 if (value == NULL)
100 return -EINVAL;
101
102 new_advise = *(char *)value;
103 if (new_advise & ~FADVISE_MODIFIABLE_BITS)
104 return -EINVAL;
105
106 new_advise = new_advise & FADVISE_MODIFIABLE_BITS;
107 new_advise |= old_advise & ~FADVISE_MODIFIABLE_BITS;
108
109 F2FS_I(inode)->i_advise = new_advise;
110 f2fs_mark_inode_dirty_sync(inode, true);
111 return 0;
112 }
113
114 #ifdef CONFIG_F2FS_FS_SECURITY
f2fs_initxattrs(struct inode * inode,const struct xattr * xattr_array,void * page)115 static int f2fs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
116 void *page)
117 {
118 const struct xattr *xattr;
119 int err = 0;
120
121 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
122 err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY,
123 xattr->name, xattr->value,
124 xattr->value_len, (struct page *)page, 0);
125 if (err < 0)
126 break;
127 }
128 return err;
129 }
130
f2fs_init_security(struct inode * inode,struct inode * dir,const struct qstr * qstr,struct page * ipage)131 int f2fs_init_security(struct inode *inode, struct inode *dir,
132 const struct qstr *qstr, struct page *ipage)
133 {
134 return security_inode_init_security(inode, dir, qstr,
135 &f2fs_initxattrs, ipage);
136 }
137 #endif
138
139 const struct xattr_handler f2fs_xattr_user_handler = {
140 .prefix = XATTR_USER_PREFIX,
141 .flags = F2FS_XATTR_INDEX_USER,
142 .list = f2fs_xattr_user_list,
143 .get = f2fs_xattr_generic_get,
144 .set = f2fs_xattr_generic_set,
145 };
146
147 const struct xattr_handler f2fs_xattr_trusted_handler = {
148 .prefix = XATTR_TRUSTED_PREFIX,
149 .flags = F2FS_XATTR_INDEX_TRUSTED,
150 .list = f2fs_xattr_trusted_list,
151 .get = f2fs_xattr_generic_get,
152 .set = f2fs_xattr_generic_set,
153 };
154
155 const struct xattr_handler f2fs_xattr_advise_handler = {
156 .name = F2FS_SYSTEM_ADVISE_NAME,
157 .flags = F2FS_XATTR_INDEX_ADVISE,
158 .get = f2fs_xattr_advise_get,
159 .set = f2fs_xattr_advise_set,
160 };
161
162 const struct xattr_handler f2fs_xattr_security_handler = {
163 .prefix = XATTR_SECURITY_PREFIX,
164 .flags = F2FS_XATTR_INDEX_SECURITY,
165 .get = f2fs_xattr_generic_get,
166 .set = f2fs_xattr_generic_set,
167 };
168
169 static const struct xattr_handler *f2fs_xattr_handler_map[] = {
170 [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
171 #ifdef CONFIG_F2FS_FS_POSIX_ACL
172 [F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
173 [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler,
174 #endif
175 [F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
176 #ifdef CONFIG_F2FS_FS_SECURITY
177 [F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
178 #endif
179 [F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
180 };
181
182 const struct xattr_handler *f2fs_xattr_handlers[] = {
183 &f2fs_xattr_user_handler,
184 #ifdef CONFIG_F2FS_FS_POSIX_ACL
185 &posix_acl_access_xattr_handler,
186 &posix_acl_default_xattr_handler,
187 #endif
188 &f2fs_xattr_trusted_handler,
189 #ifdef CONFIG_F2FS_FS_SECURITY
190 &f2fs_xattr_security_handler,
191 #endif
192 &f2fs_xattr_advise_handler,
193 NULL,
194 };
195
f2fs_xattr_handler(int index)196 static inline const struct xattr_handler *f2fs_xattr_handler(int index)
197 {
198 const struct xattr_handler *handler = NULL;
199
200 if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map))
201 handler = f2fs_xattr_handler_map[index];
202 return handler;
203 }
204
__find_xattr(void * base_addr,int index,size_t len,const char * name)205 static struct f2fs_xattr_entry *__find_xattr(void *base_addr, int index,
206 size_t len, const char *name)
207 {
208 struct f2fs_xattr_entry *entry;
209
210 list_for_each_xattr(entry, base_addr) {
211 if (entry->e_name_index != index)
212 continue;
213 if (entry->e_name_len != len)
214 continue;
215 if (!memcmp(entry->e_name, name, len))
216 break;
217 }
218 return entry;
219 }
220
__find_inline_xattr(struct inode * inode,void * base_addr,void ** last_addr,int index,size_t len,const char * name)221 static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode,
222 void *base_addr, void **last_addr, int index,
223 size_t len, const char *name)
224 {
225 struct f2fs_xattr_entry *entry;
226 unsigned int inline_size = inline_xattr_size(inode);
227 void *max_addr = base_addr + inline_size;
228
229 list_for_each_xattr(entry, base_addr) {
230 if ((void *)entry + sizeof(__u32) > max_addr ||
231 (void *)XATTR_NEXT_ENTRY(entry) > max_addr) {
232 *last_addr = entry;
233 return NULL;
234 }
235 if (entry->e_name_index != index)
236 continue;
237 if (entry->e_name_len != len)
238 continue;
239 if (!memcmp(entry->e_name, name, len))
240 break;
241 }
242
243 /* inline xattr header or entry across max inline xattr size */
244 if (IS_XATTR_LAST_ENTRY(entry) &&
245 (void *)entry + sizeof(__u32) > max_addr) {
246 *last_addr = entry;
247 return NULL;
248 }
249 return entry;
250 }
251
read_inline_xattr(struct inode * inode,struct page * ipage,void * txattr_addr)252 static int read_inline_xattr(struct inode *inode, struct page *ipage,
253 void *txattr_addr)
254 {
255 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
256 unsigned int inline_size = inline_xattr_size(inode);
257 struct page *page = NULL;
258 void *inline_addr;
259
260 if (ipage) {
261 inline_addr = inline_xattr_addr(inode, ipage);
262 } else {
263 page = f2fs_get_node_page(sbi, inode->i_ino);
264 if (IS_ERR(page))
265 return PTR_ERR(page);
266
267 inline_addr = inline_xattr_addr(inode, page);
268 }
269 memcpy(txattr_addr, inline_addr, inline_size);
270 f2fs_put_page(page, 1);
271
272 return 0;
273 }
274
read_xattr_block(struct inode * inode,void * txattr_addr)275 static int read_xattr_block(struct inode *inode, void *txattr_addr)
276 {
277 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
278 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
279 unsigned int inline_size = inline_xattr_size(inode);
280 struct page *xpage;
281 void *xattr_addr;
282
283 /* The inode already has an extended attribute block. */
284 xpage = f2fs_get_node_page(sbi, xnid);
285 if (IS_ERR(xpage))
286 return PTR_ERR(xpage);
287
288 xattr_addr = page_address(xpage);
289 memcpy(txattr_addr + inline_size, xattr_addr, VALID_XATTR_BLOCK_SIZE);
290 f2fs_put_page(xpage, 1);
291
292 return 0;
293 }
294
lookup_all_xattrs(struct inode * inode,struct page * ipage,unsigned int index,unsigned int len,const char * name,struct f2fs_xattr_entry ** xe,void ** base_addr,int * base_size)295 static int lookup_all_xattrs(struct inode *inode, struct page *ipage,
296 unsigned int index, unsigned int len,
297 const char *name, struct f2fs_xattr_entry **xe,
298 void **base_addr, int *base_size)
299 {
300 void *cur_addr, *txattr_addr, *last_addr = NULL;
301 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
302 unsigned int size = xnid ? VALID_XATTR_BLOCK_SIZE : 0;
303 unsigned int inline_size = inline_xattr_size(inode);
304 int err = 0;
305
306 if (!size && !inline_size)
307 return -ENODATA;
308
309 *base_size = inline_size + size + XATTR_PADDING_SIZE;
310 txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode), *base_size, GFP_NOFS);
311 if (!txattr_addr)
312 return -ENOMEM;
313
314 /* read from inline xattr */
315 if (inline_size) {
316 err = read_inline_xattr(inode, ipage, txattr_addr);
317 if (err)
318 goto out;
319
320 *xe = __find_inline_xattr(inode, txattr_addr, &last_addr,
321 index, len, name);
322 if (*xe) {
323 *base_size = inline_size;
324 goto check;
325 }
326 }
327
328 /* read from xattr node block */
329 if (xnid) {
330 err = read_xattr_block(inode, txattr_addr);
331 if (err)
332 goto out;
333 }
334
335 if (last_addr)
336 cur_addr = XATTR_HDR(last_addr) - 1;
337 else
338 cur_addr = txattr_addr;
339
340 *xe = __find_xattr(cur_addr, index, len, name);
341 check:
342 if (IS_XATTR_LAST_ENTRY(*xe)) {
343 err = -ENODATA;
344 goto out;
345 }
346
347 *base_addr = txattr_addr;
348 return 0;
349 out:
350 kvfree(txattr_addr);
351 return err;
352 }
353
read_all_xattrs(struct inode * inode,struct page * ipage,void ** base_addr)354 static int read_all_xattrs(struct inode *inode, struct page *ipage,
355 void **base_addr)
356 {
357 struct f2fs_xattr_header *header;
358 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
359 unsigned int size = VALID_XATTR_BLOCK_SIZE;
360 unsigned int inline_size = inline_xattr_size(inode);
361 void *txattr_addr;
362 int err;
363
364 txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode),
365 inline_size + size + XATTR_PADDING_SIZE, GFP_NOFS);
366 if (!txattr_addr)
367 return -ENOMEM;
368
369 /* read from inline xattr */
370 if (inline_size) {
371 err = read_inline_xattr(inode, ipage, txattr_addr);
372 if (err)
373 goto fail;
374 }
375
376 /* read from xattr node block */
377 if (xnid) {
378 err = read_xattr_block(inode, txattr_addr);
379 if (err)
380 goto fail;
381 }
382
383 header = XATTR_HDR(txattr_addr);
384
385 /* never been allocated xattrs */
386 if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
387 header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
388 header->h_refcount = cpu_to_le32(1);
389 }
390 *base_addr = txattr_addr;
391 return 0;
392 fail:
393 kvfree(txattr_addr);
394 return err;
395 }
396
write_all_xattrs(struct inode * inode,__u32 hsize,void * txattr_addr,struct page * ipage)397 static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
398 void *txattr_addr, struct page *ipage)
399 {
400 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
401 size_t inline_size = inline_xattr_size(inode);
402 struct page *in_page = NULL;
403 void *xattr_addr;
404 void *inline_addr = NULL;
405 struct page *xpage;
406 nid_t new_nid = 0;
407 int err = 0;
408
409 if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
410 if (!f2fs_alloc_nid(sbi, &new_nid))
411 return -ENOSPC;
412
413 /* write to inline xattr */
414 if (inline_size) {
415 if (ipage) {
416 inline_addr = inline_xattr_addr(inode, ipage);
417 } else {
418 in_page = f2fs_get_node_page(sbi, inode->i_ino);
419 if (IS_ERR(in_page)) {
420 f2fs_alloc_nid_failed(sbi, new_nid);
421 return PTR_ERR(in_page);
422 }
423 inline_addr = inline_xattr_addr(inode, in_page);
424 }
425
426 f2fs_wait_on_page_writeback(ipage ? ipage : in_page,
427 NODE, true, true);
428 /* no need to use xattr node block */
429 if (hsize <= inline_size) {
430 err = f2fs_truncate_xattr_node(inode);
431 f2fs_alloc_nid_failed(sbi, new_nid);
432 if (err) {
433 f2fs_put_page(in_page, 1);
434 return err;
435 }
436 memcpy(inline_addr, txattr_addr, inline_size);
437 set_page_dirty(ipage ? ipage : in_page);
438 goto in_page_out;
439 }
440 }
441
442 /* write to xattr node block */
443 if (F2FS_I(inode)->i_xattr_nid) {
444 xpage = f2fs_get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
445 if (IS_ERR(xpage)) {
446 err = PTR_ERR(xpage);
447 f2fs_alloc_nid_failed(sbi, new_nid);
448 goto in_page_out;
449 }
450 f2fs_bug_on(sbi, new_nid);
451 f2fs_wait_on_page_writeback(xpage, NODE, true, true);
452 } else {
453 struct dnode_of_data dn;
454 set_new_dnode(&dn, inode, NULL, NULL, new_nid);
455 xpage = f2fs_new_node_page(&dn, XATTR_NODE_OFFSET);
456 if (IS_ERR(xpage)) {
457 err = PTR_ERR(xpage);
458 f2fs_alloc_nid_failed(sbi, new_nid);
459 goto in_page_out;
460 }
461 f2fs_alloc_nid_done(sbi, new_nid);
462 }
463 xattr_addr = page_address(xpage);
464
465 if (inline_size)
466 memcpy(inline_addr, txattr_addr, inline_size);
467 memcpy(xattr_addr, txattr_addr + inline_size, VALID_XATTR_BLOCK_SIZE);
468
469 if (inline_size)
470 set_page_dirty(ipage ? ipage : in_page);
471 set_page_dirty(xpage);
472
473 f2fs_put_page(xpage, 1);
474 in_page_out:
475 f2fs_put_page(in_page, 1);
476 return err;
477 }
478
f2fs_getxattr(struct inode * inode,int index,const char * name,void * buffer,size_t buffer_size,struct page * ipage)479 int f2fs_getxattr(struct inode *inode, int index, const char *name,
480 void *buffer, size_t buffer_size, struct page *ipage)
481 {
482 struct f2fs_xattr_entry *entry = NULL;
483 int error = 0;
484 unsigned int size, len;
485 void *base_addr = NULL;
486 int base_size;
487
488 if (name == NULL)
489 return -EINVAL;
490
491 len = strlen(name);
492 if (len > F2FS_NAME_LEN)
493 return -ERANGE;
494
495 down_read(&F2FS_I(inode)->i_xattr_sem);
496 error = lookup_all_xattrs(inode, ipage, index, len, name,
497 &entry, &base_addr, &base_size);
498 up_read(&F2FS_I(inode)->i_xattr_sem);
499 if (error)
500 return error;
501
502 size = le16_to_cpu(entry->e_value_size);
503
504 if (buffer && size > buffer_size) {
505 error = -ERANGE;
506 goto out;
507 }
508
509 if (buffer) {
510 char *pval = entry->e_name + entry->e_name_len;
511
512 if (base_size - (pval - (char *)base_addr) < size) {
513 error = -ERANGE;
514 goto out;
515 }
516 memcpy(buffer, pval, size);
517 }
518 error = size;
519 out:
520 kvfree(base_addr);
521 return error;
522 }
523
f2fs_listxattr(struct dentry * dentry,char * buffer,size_t buffer_size)524 ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
525 {
526 struct inode *inode = d_inode(dentry);
527 struct f2fs_xattr_entry *entry;
528 void *base_addr;
529 int error = 0;
530 size_t rest = buffer_size;
531
532 down_read(&F2FS_I(inode)->i_xattr_sem);
533 error = read_all_xattrs(inode, NULL, &base_addr);
534 up_read(&F2FS_I(inode)->i_xattr_sem);
535 if (error)
536 return error;
537
538 list_for_each_xattr(entry, base_addr) {
539 const struct xattr_handler *handler =
540 f2fs_xattr_handler(entry->e_name_index);
541 const char *prefix;
542 size_t prefix_len;
543 size_t size;
544
545 if (!handler || (handler->list && !handler->list(dentry)))
546 continue;
547
548 prefix = xattr_prefix(handler);
549 prefix_len = strlen(prefix);
550 size = prefix_len + entry->e_name_len + 1;
551 if (buffer) {
552 if (size > rest) {
553 error = -ERANGE;
554 goto cleanup;
555 }
556 memcpy(buffer, prefix, prefix_len);
557 buffer += prefix_len;
558 memcpy(buffer, entry->e_name, entry->e_name_len);
559 buffer += entry->e_name_len;
560 *buffer++ = 0;
561 }
562 rest -= size;
563 }
564 error = buffer_size - rest;
565 cleanup:
566 kvfree(base_addr);
567 return error;
568 }
569
f2fs_xattr_value_same(struct f2fs_xattr_entry * entry,const void * value,size_t size)570 static bool f2fs_xattr_value_same(struct f2fs_xattr_entry *entry,
571 const void *value, size_t size)
572 {
573 void *pval = entry->e_name + entry->e_name_len;
574
575 return (le16_to_cpu(entry->e_value_size) == size) &&
576 !memcmp(pval, value, size);
577 }
578
__f2fs_setxattr(struct inode * inode,int index,const char * name,const void * value,size_t size,struct page * ipage,int flags)579 static int __f2fs_setxattr(struct inode *inode, int index,
580 const char *name, const void *value, size_t size,
581 struct page *ipage, int flags)
582 {
583 struct f2fs_xattr_entry *here, *last;
584 void *base_addr;
585 int found, newsize;
586 size_t len;
587 __u32 new_hsize;
588 int error = 0;
589
590 if (name == NULL)
591 return -EINVAL;
592
593 if (value == NULL)
594 size = 0;
595
596 len = strlen(name);
597
598 if (len > F2FS_NAME_LEN)
599 return -ERANGE;
600
601 if (size > MAX_VALUE_LEN(inode))
602 return -E2BIG;
603
604 error = read_all_xattrs(inode, ipage, &base_addr);
605 if (error)
606 return error;
607
608 /* find entry with wanted name. */
609 here = __find_xattr(base_addr, index, len, name);
610
611 found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
612
613 if (found) {
614 if ((flags & XATTR_CREATE)) {
615 error = -EEXIST;
616 goto exit;
617 }
618
619 if (value && f2fs_xattr_value_same(here, value, size))
620 goto exit;
621 } else if ((flags & XATTR_REPLACE)) {
622 error = -ENODATA;
623 goto exit;
624 }
625
626 last = here;
627 while (!IS_XATTR_LAST_ENTRY(last))
628 last = XATTR_NEXT_ENTRY(last);
629
630 newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
631
632 /* 1. Check space */
633 if (value) {
634 int free;
635 /*
636 * If value is NULL, it is remove operation.
637 * In case of update operation, we calculate free.
638 */
639 free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
640 if (found)
641 free = free + ENTRY_SIZE(here);
642
643 if (unlikely(free < newsize)) {
644 error = -E2BIG;
645 goto exit;
646 }
647 }
648
649 /* 2. Remove old entry */
650 if (found) {
651 /*
652 * If entry is found, remove old entry.
653 * If not found, remove operation is not needed.
654 */
655 struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
656 int oldsize = ENTRY_SIZE(here);
657
658 memmove(here, next, (char *)last - (char *)next);
659 last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
660 memset(last, 0, oldsize);
661 }
662
663 new_hsize = (char *)last - (char *)base_addr;
664
665 /* 3. Write new entry */
666 if (value) {
667 char *pval;
668 /*
669 * Before we come here, old entry is removed.
670 * We just write new entry.
671 */
672 last->e_name_index = index;
673 last->e_name_len = len;
674 memcpy(last->e_name, name, len);
675 pval = last->e_name + len;
676 memcpy(pval, value, size);
677 last->e_value_size = cpu_to_le16(size);
678 new_hsize += newsize;
679 }
680
681 error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
682 if (error)
683 goto exit;
684
685 if (is_inode_flag_set(inode, FI_ACL_MODE)) {
686 inode->i_mode = F2FS_I(inode)->i_acl_mode;
687 inode->i_ctime = current_time(inode);
688 clear_inode_flag(inode, FI_ACL_MODE);
689 }
690 if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
691 !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
692 f2fs_set_encrypted_inode(inode);
693 f2fs_mark_inode_dirty_sync(inode, true);
694 if (!error && S_ISDIR(inode->i_mode))
695 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP);
696 exit:
697 kvfree(base_addr);
698 return error;
699 }
700
f2fs_setxattr(struct inode * inode,int index,const char * name,const void * value,size_t size,struct page * ipage,int flags)701 int f2fs_setxattr(struct inode *inode, int index, const char *name,
702 const void *value, size_t size,
703 struct page *ipage, int flags)
704 {
705 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
706 int err;
707
708 err = dquot_initialize(inode);
709 if (err)
710 return err;
711
712 /* this case is only from f2fs_init_inode_metadata */
713 if (ipage)
714 return __f2fs_setxattr(inode, index, name, value,
715 size, ipage, flags);
716 f2fs_balance_fs(sbi, true);
717
718 f2fs_lock_op(sbi);
719 /* protect xattr_ver */
720 down_write(&F2FS_I(inode)->i_sem);
721 down_write(&F2FS_I(inode)->i_xattr_sem);
722 err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
723 up_write(&F2FS_I(inode)->i_xattr_sem);
724 up_write(&F2FS_I(inode)->i_sem);
725 f2fs_unlock_op(sbi);
726
727 f2fs_update_time(sbi, REQ_TIME);
728 return err;
729 }
730