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
xattr_alloc(struct f2fs_sb_info * sbi,int size,bool * is_inline)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
xattr_free(struct f2fs_sb_info * sbi,void * xattr_addr,bool is_inline)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
f2fs_xattr_generic_get(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * buffer,size_t size)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
f2fs_xattr_generic_set(const struct xattr_handler * handler,struct user_namespace * mnt_userns,struct dentry * unused,struct inode * inode,const char * name,const void * value,size_t size,int flags)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
f2fs_xattr_user_list(struct dentry * dentry)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
f2fs_xattr_trusted_list(struct dentry * dentry)97 static bool f2fs_xattr_trusted_list(struct dentry *dentry)
98 {
99 return capable(CAP_SYS_ADMIN);
100 }
101
f2fs_xattr_advise_get(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * buffer,size_t size)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
f2fs_xattr_advise_set(const struct xattr_handler * handler,struct user_namespace * mnt_userns,struct dentry * unused,struct inode * inode,const char * name,const void * value,size_t size,int flags)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
f2fs_initxattrs(struct inode * inode,const struct xattr * xattr_array,void * page)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
f2fs_init_security(struct inode * inode,struct inode * dir,const struct qstr * qstr,struct page * ipage)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
f2fs_xattr_handler(int index)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
__find_xattr(void * base_addr,void * last_base_addr,void ** last_addr,int index,size_t len,const char * name)228 static struct f2fs_xattr_entry *__find_xattr(void *base_addr,
229 void *last_base_addr, void **last_addr,
230 int index, 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 if (last_addr)
238 *last_addr = entry;
239 return NULL;
240 }
241
242 if (entry->e_name_index != index)
243 continue;
244 if (entry->e_name_len != len)
245 continue;
246 if (!memcmp(entry->e_name, name, len))
247 break;
248 }
249 return entry;
250 }
251
__find_inline_xattr(struct inode * inode,void * base_addr,void ** last_addr,int index,size_t len,const char * name)252 static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode,
253 void *base_addr, void **last_addr, int index,
254 size_t len, const char *name)
255 {
256 struct f2fs_xattr_entry *entry;
257 unsigned int inline_size = inline_xattr_size(inode);
258 void *max_addr = base_addr + inline_size;
259
260 entry = __find_xattr(base_addr, max_addr, last_addr, index, len, name);
261 if (!entry)
262 return NULL;
263
264 /* inline xattr header or entry across max inline xattr size */
265 if (IS_XATTR_LAST_ENTRY(entry) &&
266 (void *)entry + sizeof(__u32) > max_addr) {
267 *last_addr = entry;
268 return NULL;
269 }
270 return entry;
271 }
272
read_inline_xattr(struct inode * inode,struct page * ipage,void * txattr_addr)273 static int read_inline_xattr(struct inode *inode, struct page *ipage,
274 void *txattr_addr)
275 {
276 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
277 unsigned int inline_size = inline_xattr_size(inode);
278 struct page *page = NULL;
279 void *inline_addr;
280
281 if (ipage) {
282 inline_addr = inline_xattr_addr(inode, ipage);
283 } else {
284 page = f2fs_get_node_page(sbi, inode->i_ino);
285 if (IS_ERR(page))
286 return PTR_ERR(page);
287
288 inline_addr = inline_xattr_addr(inode, page);
289 }
290 memcpy(txattr_addr, inline_addr, inline_size);
291 f2fs_put_page(page, 1);
292
293 return 0;
294 }
295
read_xattr_block(struct inode * inode,void * txattr_addr)296 static int read_xattr_block(struct inode *inode, void *txattr_addr)
297 {
298 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
299 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
300 unsigned int inline_size = inline_xattr_size(inode);
301 struct page *xpage;
302 void *xattr_addr;
303
304 /* The inode already has an extended attribute block. */
305 xpage = f2fs_get_node_page(sbi, xnid);
306 if (IS_ERR(xpage))
307 return PTR_ERR(xpage);
308
309 xattr_addr = page_address(xpage);
310 memcpy(txattr_addr + inline_size, xattr_addr, VALID_XATTR_BLOCK_SIZE);
311 f2fs_put_page(xpage, 1);
312
313 return 0;
314 }
315
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,bool * is_inline)316 static int lookup_all_xattrs(struct inode *inode, struct page *ipage,
317 unsigned int index, unsigned int len,
318 const char *name, struct f2fs_xattr_entry **xe,
319 void **base_addr, int *base_size,
320 bool *is_inline)
321 {
322 void *cur_addr, *txattr_addr, *last_txattr_addr;
323 void *last_addr = NULL;
324 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
325 unsigned int inline_size = inline_xattr_size(inode);
326 int err;
327
328 if (!xnid && !inline_size)
329 return -ENODATA;
330
331 *base_size = XATTR_SIZE(inode) + XATTR_PADDING_SIZE;
332 txattr_addr = xattr_alloc(F2FS_I_SB(inode), *base_size, is_inline);
333 if (!txattr_addr)
334 return -ENOMEM;
335
336 last_txattr_addr = (void *)txattr_addr + XATTR_SIZE(inode);
337
338 /* read from inline xattr */
339 if (inline_size) {
340 err = read_inline_xattr(inode, ipage, txattr_addr);
341 if (err)
342 goto out;
343
344 *xe = __find_inline_xattr(inode, txattr_addr, &last_addr,
345 index, len, name);
346 if (*xe) {
347 *base_size = inline_size;
348 goto check;
349 }
350 }
351
352 /* read from xattr node block */
353 if (xnid) {
354 err = read_xattr_block(inode, txattr_addr);
355 if (err)
356 goto out;
357 }
358
359 if (last_addr)
360 cur_addr = XATTR_HDR(last_addr) - 1;
361 else
362 cur_addr = txattr_addr;
363
364 *xe = __find_xattr(cur_addr, last_txattr_addr, NULL, index, len, name);
365 if (!*xe) {
366 f2fs_err(F2FS_I_SB(inode), "lookup inode (%lu) has corrupted xattr",
367 inode->i_ino);
368 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
369 err = -ENODATA;
370 f2fs_handle_error(F2FS_I_SB(inode),
371 ERROR_CORRUPTED_XATTR);
372 goto out;
373 }
374 check:
375 if (IS_XATTR_LAST_ENTRY(*xe)) {
376 err = -ENODATA;
377 goto out;
378 }
379
380 *base_addr = txattr_addr;
381 return 0;
382 out:
383 xattr_free(F2FS_I_SB(inode), txattr_addr, *is_inline);
384 return err;
385 }
386
read_all_xattrs(struct inode * inode,struct page * ipage,void ** base_addr)387 static int read_all_xattrs(struct inode *inode, struct page *ipage,
388 void **base_addr)
389 {
390 struct f2fs_xattr_header *header;
391 nid_t xnid = F2FS_I(inode)->i_xattr_nid;
392 unsigned int size = VALID_XATTR_BLOCK_SIZE;
393 unsigned int inline_size = inline_xattr_size(inode);
394 void *txattr_addr;
395 int err;
396
397 txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode),
398 inline_size + size + XATTR_PADDING_SIZE, GFP_NOFS);
399 if (!txattr_addr)
400 return -ENOMEM;
401
402 /* read from inline xattr */
403 if (inline_size) {
404 err = read_inline_xattr(inode, ipage, txattr_addr);
405 if (err)
406 goto fail;
407 }
408
409 /* read from xattr node block */
410 if (xnid) {
411 err = read_xattr_block(inode, txattr_addr);
412 if (err)
413 goto fail;
414 }
415
416 header = XATTR_HDR(txattr_addr);
417
418 /* never been allocated xattrs */
419 if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
420 header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
421 header->h_refcount = cpu_to_le32(1);
422 }
423 *base_addr = txattr_addr;
424 return 0;
425 fail:
426 kfree(txattr_addr);
427 return err;
428 }
429
write_all_xattrs(struct inode * inode,__u32 hsize,void * txattr_addr,struct page * ipage)430 static inline int write_all_xattrs(struct inode *inode, __u32 hsize,
431 void *txattr_addr, struct page *ipage)
432 {
433 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
434 size_t inline_size = inline_xattr_size(inode);
435 struct page *in_page = NULL;
436 void *xattr_addr;
437 void *inline_addr = NULL;
438 struct page *xpage;
439 nid_t new_nid = 0;
440 int err = 0;
441
442 if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)
443 if (!f2fs_alloc_nid(sbi, &new_nid))
444 return -ENOSPC;
445
446 /* write to inline xattr */
447 if (inline_size) {
448 if (ipage) {
449 inline_addr = inline_xattr_addr(inode, ipage);
450 } else {
451 in_page = f2fs_get_node_page(sbi, inode->i_ino);
452 if (IS_ERR(in_page)) {
453 f2fs_alloc_nid_failed(sbi, new_nid);
454 return PTR_ERR(in_page);
455 }
456 inline_addr = inline_xattr_addr(inode, in_page);
457 }
458
459 f2fs_wait_on_page_writeback(ipage ? ipage : in_page,
460 NODE, true, true);
461 /* no need to use xattr node block */
462 if (hsize <= inline_size) {
463 err = f2fs_truncate_xattr_node(inode);
464 f2fs_alloc_nid_failed(sbi, new_nid);
465 if (err) {
466 f2fs_put_page(in_page, 1);
467 return err;
468 }
469 memcpy(inline_addr, txattr_addr, inline_size);
470 set_page_dirty(ipage ? ipage : in_page);
471 goto in_page_out;
472 }
473 }
474
475 /* write to xattr node block */
476 if (F2FS_I(inode)->i_xattr_nid) {
477 xpage = f2fs_get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);
478 if (IS_ERR(xpage)) {
479 err = PTR_ERR(xpage);
480 f2fs_alloc_nid_failed(sbi, new_nid);
481 goto in_page_out;
482 }
483 f2fs_bug_on(sbi, new_nid);
484 f2fs_wait_on_page_writeback(xpage, NODE, true, true);
485 } else {
486 struct dnode_of_data dn;
487
488 set_new_dnode(&dn, inode, NULL, NULL, new_nid);
489 xpage = f2fs_new_node_page(&dn, XATTR_NODE_OFFSET);
490 if (IS_ERR(xpage)) {
491 err = PTR_ERR(xpage);
492 f2fs_alloc_nid_failed(sbi, new_nid);
493 goto in_page_out;
494 }
495 f2fs_alloc_nid_done(sbi, new_nid);
496 }
497 xattr_addr = page_address(xpage);
498
499 if (inline_size)
500 memcpy(inline_addr, txattr_addr, inline_size);
501 memcpy(xattr_addr, txattr_addr + inline_size, VALID_XATTR_BLOCK_SIZE);
502
503 if (inline_size)
504 set_page_dirty(ipage ? ipage : in_page);
505 set_page_dirty(xpage);
506
507 f2fs_put_page(xpage, 1);
508 in_page_out:
509 f2fs_put_page(in_page, 1);
510 return err;
511 }
512
f2fs_getxattr(struct inode * inode,int index,const char * name,void * buffer,size_t buffer_size,struct page * ipage)513 int f2fs_getxattr(struct inode *inode, int index, const char *name,
514 void *buffer, size_t buffer_size, struct page *ipage)
515 {
516 struct f2fs_xattr_entry *entry = NULL;
517 int error;
518 unsigned int size, len;
519 void *base_addr = NULL;
520 int base_size;
521 bool is_inline;
522
523 if (name == NULL)
524 return -EINVAL;
525
526 len = strlen(name);
527 if (len > F2FS_NAME_LEN)
528 return -ERANGE;
529
530 if (!ipage)
531 f2fs_down_read(&F2FS_I(inode)->i_xattr_sem);
532 error = lookup_all_xattrs(inode, ipage, index, len, name,
533 &entry, &base_addr, &base_size, &is_inline);
534 if (!ipage)
535 f2fs_up_read(&F2FS_I(inode)->i_xattr_sem);
536 if (error)
537 return error;
538
539 size = le16_to_cpu(entry->e_value_size);
540
541 if (buffer && size > buffer_size) {
542 error = -ERANGE;
543 goto out;
544 }
545
546 if (buffer) {
547 char *pval = entry->e_name + entry->e_name_len;
548
549 if (base_size - (pval - (char *)base_addr) < size) {
550 error = -ERANGE;
551 goto out;
552 }
553 memcpy(buffer, pval, size);
554 }
555 error = size;
556 out:
557 xattr_free(F2FS_I_SB(inode), base_addr, is_inline);
558 return error;
559 }
560
f2fs_listxattr(struct dentry * dentry,char * buffer,size_t buffer_size)561 ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
562 {
563 struct inode *inode = d_inode(dentry);
564 struct f2fs_xattr_entry *entry;
565 void *base_addr, *last_base_addr;
566 int error;
567 size_t rest = buffer_size;
568
569 f2fs_down_read(&F2FS_I(inode)->i_xattr_sem);
570 error = read_all_xattrs(inode, NULL, &base_addr);
571 f2fs_up_read(&F2FS_I(inode)->i_xattr_sem);
572 if (error)
573 return error;
574
575 last_base_addr = (void *)base_addr + XATTR_SIZE(inode);
576
577 list_for_each_xattr(entry, base_addr) {
578 const struct xattr_handler *handler =
579 f2fs_xattr_handler(entry->e_name_index);
580 const char *prefix;
581 size_t prefix_len;
582 size_t size;
583
584 if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
585 (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) {
586 f2fs_err(F2FS_I_SB(inode), "list inode (%lu) has corrupted xattr",
587 inode->i_ino);
588 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
589 f2fs_handle_error(F2FS_I_SB(inode),
590 ERROR_CORRUPTED_XATTR);
591 break;
592 }
593
594 if (!handler || (handler->list && !handler->list(dentry)))
595 continue;
596
597 prefix = xattr_prefix(handler);
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
f2fs_xattr_value_same(struct f2fs_xattr_entry * entry,const void * value,size_t size)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
__f2fs_setxattr(struct inode * inode,int index,const char * name,const void * value,size_t size,struct page * ipage,int flags)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_xattr_entry *here, *last;
633 void *base_addr, *last_base_addr;
634 int found, newsize;
635 size_t len;
636 __u32 new_hsize;
637 int error;
638
639 if (name == NULL)
640 return -EINVAL;
641
642 if (value == NULL)
643 size = 0;
644
645 len = strlen(name);
646
647 if (len > F2FS_NAME_LEN)
648 return -ERANGE;
649
650 if (size > MAX_VALUE_LEN(inode))
651 return -E2BIG;
652 retry:
653 error = read_all_xattrs(inode, ipage, &base_addr);
654 if (error)
655 return error;
656
657 last_base_addr = (void *)base_addr + XATTR_SIZE(inode);
658
659 /* find entry with wanted name. */
660 here = __find_xattr(base_addr, last_base_addr, NULL, index, len, name);
661 if (!here) {
662 if (!F2FS_I(inode)->i_xattr_nid) {
663 f2fs_notice(F2FS_I_SB(inode),
664 "recover xattr in inode (%lu)", inode->i_ino);
665 f2fs_recover_xattr_data(inode, NULL);
666 kfree(base_addr);
667 goto retry;
668 }
669 f2fs_err(F2FS_I_SB(inode), "set inode (%lu) has corrupted xattr",
670 inode->i_ino);
671 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
672 error = -EFSCORRUPTED;
673 f2fs_handle_error(F2FS_I_SB(inode),
674 ERROR_CORRUPTED_XATTR);
675 goto exit;
676 }
677
678 found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
679
680 if (found) {
681 if ((flags & XATTR_CREATE)) {
682 error = -EEXIST;
683 goto exit;
684 }
685
686 if (value && f2fs_xattr_value_same(here, value, size))
687 goto same;
688 } else if ((flags & XATTR_REPLACE)) {
689 error = -ENODATA;
690 goto exit;
691 }
692
693 last = here;
694 while (!IS_XATTR_LAST_ENTRY(last)) {
695 if ((void *)(last) + sizeof(__u32) > last_base_addr ||
696 (void *)XATTR_NEXT_ENTRY(last) > last_base_addr) {
697 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has invalid last xattr entry, entry_size: %zu",
698 inode->i_ino, ENTRY_SIZE(last));
699 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
700 error = -EFSCORRUPTED;
701 f2fs_handle_error(F2FS_I_SB(inode),
702 ERROR_CORRUPTED_XATTR);
703 goto exit;
704 }
705 last = XATTR_NEXT_ENTRY(last);
706 }
707
708 newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
709
710 /* 1. Check space */
711 if (value) {
712 int free;
713 /*
714 * If value is NULL, it is remove operation.
715 * In case of update operation, we calculate free.
716 */
717 free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
718 if (found)
719 free = free + ENTRY_SIZE(here);
720
721 if (unlikely(free < newsize)) {
722 error = -E2BIG;
723 goto exit;
724 }
725 }
726
727 /* 2. Remove old entry */
728 if (found) {
729 /*
730 * If entry is found, remove old entry.
731 * If not found, remove operation is not needed.
732 */
733 struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
734 int oldsize = ENTRY_SIZE(here);
735
736 memmove(here, next, (char *)last - (char *)next);
737 last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
738 memset(last, 0, oldsize);
739 }
740
741 new_hsize = (char *)last - (char *)base_addr;
742
743 /* 3. Write new entry */
744 if (value) {
745 char *pval;
746 /*
747 * Before we come here, old entry is removed.
748 * We just write new entry.
749 */
750 last->e_name_index = index;
751 last->e_name_len = len;
752 memcpy(last->e_name, name, len);
753 pval = last->e_name + len;
754 memcpy(pval, value, size);
755 last->e_value_size = cpu_to_le16(size);
756 new_hsize += newsize;
757 /*
758 * Explicitly add the null terminator. The unused xattr space
759 * is supposed to always be zeroed, which would make this
760 * unnecessary, but don't depend on that.
761 */
762 *(u32 *)((u8 *)last + newsize) = 0;
763 }
764
765 error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
766 if (error)
767 goto exit;
768
769 if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
770 !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
771 f2fs_set_encrypted_inode(inode);
772 f2fs_mark_inode_dirty_sync(inode, true);
773 if (!error && S_ISDIR(inode->i_mode))
774 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP);
775
776 same:
777 if (is_inode_flag_set(inode, FI_ACL_MODE)) {
778 inode->i_mode = F2FS_I(inode)->i_acl_mode;
779 inode->i_ctime = current_time(inode);
780 clear_inode_flag(inode, FI_ACL_MODE);
781 }
782
783 exit:
784 kfree(base_addr);
785 return error;
786 }
787
f2fs_setxattr(struct inode * inode,int index,const char * name,const void * value,size_t size,struct page * ipage,int flags)788 int f2fs_setxattr(struct inode *inode, int index, const char *name,
789 const void *value, size_t size,
790 struct page *ipage, int flags)
791 {
792 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
793 int err;
794
795 if (unlikely(f2fs_cp_error(sbi)))
796 return -EIO;
797 if (!f2fs_is_checkpoint_ready(sbi))
798 return -ENOSPC;
799
800 err = f2fs_dquot_initialize(inode);
801 if (err)
802 return err;
803
804 /* this case is only from f2fs_init_inode_metadata */
805 if (ipage)
806 return __f2fs_setxattr(inode, index, name, value,
807 size, ipage, flags);
808 f2fs_balance_fs(sbi, true);
809
810 f2fs_lock_op(sbi);
811 f2fs_down_write(&F2FS_I(inode)->i_xattr_sem);
812 err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
813 f2fs_up_write(&F2FS_I(inode)->i_xattr_sem);
814 f2fs_unlock_op(sbi);
815
816 f2fs_update_time(sbi, REQ_TIME);
817 return err;
818 }
819
f2fs_init_xattr_caches(struct f2fs_sb_info * sbi)820 int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi)
821 {
822 dev_t dev = sbi->sb->s_bdev->bd_dev;
823 char slab_name[32];
824
825 sprintf(slab_name, "f2fs_xattr_entry-%u:%u", MAJOR(dev), MINOR(dev));
826
827 sbi->inline_xattr_slab_size = F2FS_OPTION(sbi).inline_xattr_size *
828 sizeof(__le32) + XATTR_PADDING_SIZE;
829
830 sbi->inline_xattr_slab = f2fs_kmem_cache_create(slab_name,
831 sbi->inline_xattr_slab_size);
832 if (!sbi->inline_xattr_slab)
833 return -ENOMEM;
834
835 return 0;
836 }
837
f2fs_destroy_xattr_caches(struct f2fs_sb_info * sbi)838 void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi)
839 {
840 kmem_cache_destroy(sbi->inline_xattr_slab);
841 }
842