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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
25static 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
46static 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
68static 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
75static bool f2fs_xattr_trusted_list(struct dentry *dentry)
76{
77 return capable(CAP_SYS_ADMIN);
78}
79
80static 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
89static 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
115static 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
131int 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
139const 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
147const 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
155const 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
162const 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
169static 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
182const 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
196static 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
205static struct f2fs_xattr_entry *__find_xattr(void *base_addr,
206 void *last_base_addr, int index,
207 size_t len, const char *name)
208{
209 struct f2fs_xattr_entry *entry;
210
211 list_for_each_xattr(entry, base_addr) {
212 if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
213 (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr)
214 return NULL;
215
216 if (entry->e_name_index != index)
217 continue;
218 if (entry->e_name_len != len)
219 continue;
220 if (!memcmp(entry->e_name, name, len))
221 break;
222 }
223 return entry;
224}
225
226static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode,
227 void *base_addr, void **last_addr, int index,
228 size_t len, const char *name)
229{
230 struct f2fs_xattr_entry *entry;
231 unsigned int inline_size = inline_xattr_size(inode);
232 void *max_addr = base_addr + inline_size;
233
234 list_for_each_xattr(entry, base_addr) {
235 if ((void *)entry + sizeof(__u32) > max_addr ||
236 (void *)XATTR_NEXT_ENTRY(entry) > max_addr) {
237 *last_addr = entry;
238 return NULL;
239 }
240 if (entry->e_name_index != index)
241 continue;
242 if (entry->e_name_len != len)
243 continue;
244 if (!memcmp(entry->e_name, name, len))
245 break;
246 }
247
248
249 if (IS_XATTR_LAST_ENTRY(entry) &&
250 (void *)entry + sizeof(__u32) > max_addr) {
251 *last_addr = entry;
252 return NULL;
253 }
254 return entry;
255}
256
257static int read_inline_xattr(struct inode *inode, struct page *ipage,
258 void *txattr_addr)
259{
260 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
261 unsigned int inline_size = inline_xattr_size(inode);
262 struct page *page = NULL;
263 void *inline_addr;
264
265 if (ipage) {
266 inline_addr = inline_xattr_addr(inode, ipage);
267 } else {
268 page = f2fs_get_node_page(sbi, inode->i_ino);
269 if (IS_ERR(page))
270 return PTR_ERR(page);
271
272 inline_addr = inline_xattr_addr(inode, page);
273 }
274 memcpy(txattr_addr, inline_addr, inline_size);
275 f2fs_put_page(page, 1);
276
277 return 0;
278}
279
280static int read_xattr_block(struct inode *inode, void *txattr_addr)
281{
282 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
283 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
284 unsigned int inline_size = inline_xattr_size(inode);
285 struct page *xpage;
286 void *xattr_addr;
287
288
289 xpage = f2fs_get_node_page(sbi, xnid);
290 if (IS_ERR(xpage))
291 return PTR_ERR(xpage);
292
293 xattr_addr = page_address(xpage);
294 memcpy(txattr_addr + inline_size, xattr_addr, VALID_XATTR_BLOCK_SIZE);
295 f2fs_put_page(xpage, 1);
296
297 return 0;
298}
299
300static int lookup_all_xattrs(struct inode *inode, struct page *ipage,
301 unsigned int index, unsigned int len,
302 const char *name, struct f2fs_xattr_entry **xe,
303 void **base_addr, int *base_size)
304{
305 void *cur_addr, *txattr_addr, *last_txattr_addr;
306 void *last_addr = NULL;
307 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
308 unsigned int inline_size = inline_xattr_size(inode);
309 int err = 0;
310
311 if (!xnid && !inline_size)
312 return -ENODATA;
313
314 *base_size = XATTR_SIZE(xnid, inode) + XATTR_PADDING_SIZE;
315 txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode), *base_size, GFP_NOFS);
316 if (!txattr_addr)
317 return -ENOMEM;
318
319 last_txattr_addr = (void *)txattr_addr + XATTR_SIZE(xnid, inode);
320
321
322 if (inline_size) {
323 err = read_inline_xattr(inode, ipage, txattr_addr);
324 if (err)
325 goto out;
326
327 *xe = __find_inline_xattr(inode, txattr_addr, &last_addr,
328 index, len, name);
329 if (*xe) {
330 *base_size = inline_size;
331 goto check;
332 }
333 }
334
335
336 if (xnid) {
337 err = read_xattr_block(inode, txattr_addr);
338 if (err)
339 goto out;
340 }
341
342 if (last_addr)
343 cur_addr = XATTR_HDR(last_addr) - 1;
344 else
345 cur_addr = txattr_addr;
346
347 *xe = __find_xattr(cur_addr, last_txattr_addr, index, len, name);
348 if (!*xe) {
349 err = -EFAULT;
350 goto out;
351 }
352check:
353 if (IS_XATTR_LAST_ENTRY(*xe)) {
354 err = -ENODATA;
355 goto out;
356 }
357
358 *base_addr = txattr_addr;
359 return 0;
360out:
361 kvfree(txattr_addr);
362 return err;
363}
364
365static int read_all_xattrs(struct inode *inode, struct page *ipage,
366 void **base_addr)
367{
368 struct f2fs_xattr_header *header;
369 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
370 unsigned int size = VALID_XATTR_BLOCK_SIZE;
371 unsigned int inline_size = inline_xattr_size(inode);
372 void *txattr_addr;
373 int err;
374
375 txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode),
376 inline_size + size + XATTR_PADDING_SIZE, GFP_NOFS);
377 if (!txattr_addr)
378 return -ENOMEM;
379
380
381 if (inline_size) {
382 err = read_inline_xattr(inode, ipage, txattr_addr);
383 if (err)
384 goto fail;
385 }
386
387
388 if (xnid) {
389 err = read_xattr_block(inode, txattr_addr);
390 if (err)
391 goto fail;
392 }
393
394 header = XATTR_HDR(txattr_addr);
395
396
397 if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
398 header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
399 header->h_refcount = cpu_to_le32(1);
400 }
401 *base_addr = txattr_addr;
402 return 0;
403fail:
404 kvfree(txattr_addr);
405 return err;
406}
407
408static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
409 void *txattr_addr, struct page *ipage)
410{
411 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
412 size_t inline_size = inline_xattr_size(inode);
413 struct page *in_page = NULL;
414 void *xattr_addr;
415 void *inline_addr = NULL;
416 struct page *xpage;
417 nid_t new_nid = 0;
418 int err = 0;
419
420 if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
421 if (!f2fs_alloc_nid(sbi, &new_nid))
422 return -ENOSPC;
423
424
425 if (inline_size) {
426 if (ipage) {
427 inline_addr = inline_xattr_addr(inode, ipage);
428 } else {
429 in_page = f2fs_get_node_page(sbi, inode->i_ino);
430 if (IS_ERR(in_page)) {
431 f2fs_alloc_nid_failed(sbi, new_nid);
432 return PTR_ERR(in_page);
433 }
434 inline_addr = inline_xattr_addr(inode, in_page);
435 }
436
437 f2fs_wait_on_page_writeback(ipage ? ipage : in_page,
438 NODE, true, true);
439
440 if (hsize <= inline_size) {
441 err = f2fs_truncate_xattr_node(inode);
442 f2fs_alloc_nid_failed(sbi, new_nid);
443 if (err) {
444 f2fs_put_page(in_page, 1);
445 return err;
446 }
447 memcpy(inline_addr, txattr_addr, inline_size);
448 set_page_dirty(ipage ? ipage : in_page);
449 goto in_page_out;
450 }
451 }
452
453
454 if (F2FS_I(inode)->i_xattr_nid) {
455 xpage = f2fs_get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
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_bug_on(sbi, new_nid);
462 f2fs_wait_on_page_writeback(xpage, NODE, true, true);
463 } else {
464 struct dnode_of_data dn;
465 set_new_dnode(&dn, inode, NULL, NULL, new_nid);
466 xpage = f2fs_new_node_page(&dn, XATTR_NODE_OFFSET);
467 if (IS_ERR(xpage)) {
468 err = PTR_ERR(xpage);
469 f2fs_alloc_nid_failed(sbi, new_nid);
470 goto in_page_out;
471 }
472 f2fs_alloc_nid_done(sbi, new_nid);
473 }
474 xattr_addr = page_address(xpage);
475
476 if (inline_size)
477 memcpy(inline_addr, txattr_addr, inline_size);
478 memcpy(xattr_addr, txattr_addr + inline_size, VALID_XATTR_BLOCK_SIZE);
479
480 if (inline_size)
481 set_page_dirty(ipage ? ipage : in_page);
482 set_page_dirty(xpage);
483
484 f2fs_put_page(xpage, 1);
485in_page_out:
486 f2fs_put_page(in_page, 1);
487 return err;
488}
489
490int f2fs_getxattr(struct inode *inode, int index, const char *name,
491 void *buffer, size_t buffer_size, struct page *ipage)
492{
493 struct f2fs_xattr_entry *entry = NULL;
494 int error = 0;
495 unsigned int size, len;
496 void *base_addr = NULL;
497 int base_size;
498
499 if (name == NULL)
500 return -EINVAL;
501
502 len = strlen(name);
503 if (len > F2FS_NAME_LEN)
504 return -ERANGE;
505
506 down_read(&F2FS_I(inode)->i_xattr_sem);
507 error = lookup_all_xattrs(inode, ipage, index, len, name,
508 &entry, &base_addr, &base_size);
509 up_read(&F2FS_I(inode)->i_xattr_sem);
510 if (error)
511 return error;
512
513 size = le16_to_cpu(entry->e_value_size);
514
515 if (buffer && size > buffer_size) {
516 error = -ERANGE;
517 goto out;
518 }
519
520 if (buffer) {
521 char *pval = entry->e_name + entry->e_name_len;
522
523 if (base_size - (pval - (char *)base_addr) < size) {
524 error = -ERANGE;
525 goto out;
526 }
527 memcpy(buffer, pval, size);
528 }
529 error = size;
530out:
531 kvfree(base_addr);
532 return error;
533}
534
535ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
536{
537 struct inode *inode = d_inode(dentry);
538 struct f2fs_xattr_entry *entry;
539 void *base_addr;
540 int error = 0;
541 size_t rest = buffer_size;
542
543 down_read(&F2FS_I(inode)->i_xattr_sem);
544 error = read_all_xattrs(inode, NULL, &base_addr);
545 up_read(&F2FS_I(inode)->i_xattr_sem);
546 if (error)
547 return error;
548
549 list_for_each_xattr(entry, base_addr) {
550 const struct xattr_handler *handler =
551 f2fs_xattr_handler(entry->e_name_index);
552 const char *prefix;
553 size_t prefix_len;
554 size_t size;
555
556 if (!handler || (handler->list && !handler->list(dentry)))
557 continue;
558
559 prefix = xattr_prefix(handler);
560 prefix_len = strlen(prefix);
561 size = prefix_len + entry->e_name_len + 1;
562 if (buffer) {
563 if (size > rest) {
564 error = -ERANGE;
565 goto cleanup;
566 }
567 memcpy(buffer, prefix, prefix_len);
568 buffer += prefix_len;
569 memcpy(buffer, entry->e_name, entry->e_name_len);
570 buffer += entry->e_name_len;
571 *buffer++ = 0;
572 }
573 rest -= size;
574 }
575 error = buffer_size - rest;
576cleanup:
577 kvfree(base_addr);
578 return error;
579}
580
581static bool f2fs_xattr_value_same(struct f2fs_xattr_entry *entry,
582 const void *value, size_t size)
583{
584 void *pval = entry->e_name + entry->e_name_len;
585
586 return (le16_to_cpu(entry->e_value_size) == size) &&
587 !memcmp(pval, value, size);
588}
589
590static int __f2fs_setxattr(struct inode *inode, int index,
591 const char *name, const void *value, size_t size,
592 struct page *ipage, int flags)
593{
594 struct f2fs_xattr_entry *here, *last;
595 void *base_addr, *last_base_addr;
596 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
597 int found, newsize;
598 size_t len;
599 __u32 new_hsize;
600 int error = 0;
601
602 if (name == NULL)
603 return -EINVAL;
604
605 if (value == NULL)
606 size = 0;
607
608 len = strlen(name);
609
610 if (len > F2FS_NAME_LEN)
611 return -ERANGE;
612
613 if (size > MAX_VALUE_LEN(inode))
614 return -E2BIG;
615
616 error = read_all_xattrs(inode, ipage, &base_addr);
617 if (error)
618 return error;
619
620 last_base_addr = (void *)base_addr + XATTR_SIZE(xnid, inode);
621
622
623 here = __find_xattr(base_addr, last_base_addr, index, len, name);
624 if (!here) {
625 error = -EFAULT;
626 goto exit;
627 }
628
629 found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
630
631 if (found) {
632 if ((flags & XATTR_CREATE)) {
633 error = -EEXIST;
634 goto exit;
635 }
636
637 if (value && f2fs_xattr_value_same(here, value, size))
638 goto exit;
639 } else if ((flags & XATTR_REPLACE)) {
640 error = -ENODATA;
641 goto exit;
642 }
643
644 last = here;
645 while (!IS_XATTR_LAST_ENTRY(last))
646 last = XATTR_NEXT_ENTRY(last);
647
648 newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
649
650
651 if (value) {
652 int free;
653
654
655
656
657 free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
658 if (found)
659 free = free + ENTRY_SIZE(here);
660
661 if (unlikely(free < newsize)) {
662 error = -E2BIG;
663 goto exit;
664 }
665 }
666
667
668 if (found) {
669
670
671
672
673 struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
674 int oldsize = ENTRY_SIZE(here);
675
676 memmove(here, next, (char *)last - (char *)next);
677 last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
678 memset(last, 0, oldsize);
679 }
680
681 new_hsize = (char *)last - (char *)base_addr;
682
683
684 if (value) {
685 char *pval;
686
687
688
689
690 last->e_name_index = index;
691 last->e_name_len = len;
692 memcpy(last->e_name, name, len);
693 pval = last->e_name + len;
694 memcpy(pval, value, size);
695 last->e_value_size = cpu_to_le16(size);
696 new_hsize += newsize;
697 }
698
699 error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
700 if (error)
701 goto exit;
702
703 if (is_inode_flag_set(inode, FI_ACL_MODE)) {
704 inode->i_mode = F2FS_I(inode)->i_acl_mode;
705 inode->i_ctime = current_time(inode);
706 clear_inode_flag(inode, FI_ACL_MODE);
707 }
708 if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
709 !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
710 f2fs_set_encrypted_inode(inode);
711 f2fs_mark_inode_dirty_sync(inode, true);
712 if (!error && S_ISDIR(inode->i_mode))
713 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP);
714exit:
715 kvfree(base_addr);
716 return error;
717}
718
719int f2fs_setxattr(struct inode *inode, int index, const char *name,
720 const void *value, size_t size,
721 struct page *ipage, int flags)
722{
723 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
724 int err;
725
726 err = dquot_initialize(inode);
727 if (err)
728 return err;
729
730
731 if (ipage)
732 return __f2fs_setxattr(inode, index, name, value,
733 size, ipage, flags);
734 f2fs_balance_fs(sbi, true);
735
736 f2fs_lock_op(sbi);
737
738 down_write(&F2FS_I(inode)->i_sem);
739 down_write(&F2FS_I(inode)->i_xattr_sem);
740 err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
741 up_write(&F2FS_I(inode)->i_xattr_sem);
742 up_write(&F2FS_I(inode)->i_sem);
743 f2fs_unlock_op(sbi);
744
745 f2fs_update_time(sbi, REQ_TIME);
746 return err;
747}
748
