]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - fs/ubifs/xattr.c
Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-eoan-kernel.git] / fs / ubifs / xattr.c
1 /*
2 * This file is part of UBIFS.
3 *
4 * Copyright (C) 2006-2008 Nokia Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors: Artem Bityutskiy (Битюцкий Артём)
20 * Adrian Hunter
21 */
22
23 /*
24 * This file implements UBIFS extended attributes support.
25 *
26 * Extended attributes are implemented as regular inodes with attached data,
27 * which limits extended attribute size to UBIFS block size (4KiB). Names of
28 * extended attributes are described by extended attribute entries (xentries),
29 * which are almost identical to directory entries, but have different key type.
30 *
31 * In other words, the situation with extended attributes is very similar to
32 * directories. Indeed, any inode (but of course not xattr inodes) may have a
33 * number of associated xentries, just like directory inodes have associated
34 * directory entries. Extended attribute entries store the name of the extended
35 * attribute, the host inode number, and the extended attribute inode number.
36 * Similarly, direntries store the name, the parent and the target inode
37 * numbers. Thus, most of the common UBIFS mechanisms may be re-used for
38 * extended attributes.
39 *
40 * The number of extended attributes is not limited, but there is Linux
41 * limitation on the maximum possible size of the list of all extended
42 * attributes associated with an inode (%XATTR_LIST_MAX), so UBIFS makes sure
43 * the sum of all extended attribute names of the inode does not exceed that
44 * limit.
45 *
46 * Extended attributes are synchronous, which means they are written to the
47 * flash media synchronously and there is no write-back for extended attribute
48 * inodes. The extended attribute values are not stored in compressed form on
49 * the media.
50 *
51 * Since extended attributes are represented by regular inodes, they are cached
52 * in the VFS inode cache. The xentries are cached in the LNC cache (see
53 * tnc.c).
54 *
55 * ACL support is not implemented.
56 */
57
58 #include "ubifs.h"
59 #include <linux/fs.h>
60 #include <linux/slab.h>
61 #include <linux/xattr.h>
62
63 /*
64 * Limit the number of extended attributes per inode so that the total size
65 * (@xattr_size) is guaranteeded to fit in an 'unsigned int'.
66 */
67 #define MAX_XATTRS_PER_INODE 65535
68
69 /*
70 * Extended attribute type constants.
71 *
72 * USER_XATTR: user extended attribute ("user.*")
73 * TRUSTED_XATTR: trusted extended attribute ("trusted.*)
74 * SECURITY_XATTR: security extended attribute ("security.*")
75 */
76 enum {
77 USER_XATTR,
78 TRUSTED_XATTR,
79 SECURITY_XATTR,
80 };
81
82 static const struct inode_operations empty_iops;
83 static const struct file_operations empty_fops;
84
85 /**
86 * create_xattr - create an extended attribute.
87 * @c: UBIFS file-system description object
88 * @host: host inode
89 * @nm: extended attribute name
90 * @value: extended attribute value
91 * @size: size of extended attribute value
92 *
93 * This is a helper function which creates an extended attribute of name @nm
94 * and value @value for inode @host. The host inode is also updated on flash
95 * because the ctime and extended attribute accounting data changes. This
96 * function returns zero in case of success and a negative error code in case
97 * of failure.
98 */
99 static int create_xattr(struct ubifs_info *c, struct inode *host,
100 const struct fscrypt_name *nm, const void *value, int size)
101 {
102 int err, names_len;
103 struct inode *inode;
104 struct ubifs_inode *ui, *host_ui = ubifs_inode(host);
105 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
106 .new_ino_d = ALIGN(size, 8), .dirtied_ino = 1,
107 .dirtied_ino_d = ALIGN(host_ui->data_len, 8) };
108
109 if (host_ui->xattr_cnt >= MAX_XATTRS_PER_INODE) {
110 ubifs_err(c, "inode %lu already has too many xattrs (%d), cannot create more",
111 host->i_ino, host_ui->xattr_cnt);
112 return -ENOSPC;
113 }
114 /*
115 * Linux limits the maximum size of the extended attribute names list
116 * to %XATTR_LIST_MAX. This means we should not allow creating more
117 * extended attributes if the name list becomes larger. This limitation
118 * is artificial for UBIFS, though.
119 */
120 names_len = host_ui->xattr_names + host_ui->xattr_cnt + fname_len(nm) + 1;
121 if (names_len > XATTR_LIST_MAX) {
122 ubifs_err(c, "cannot add one more xattr name to inode %lu, total names length would become %d, max. is %d",
123 host->i_ino, names_len, XATTR_LIST_MAX);
124 return -ENOSPC;
125 }
126
127 err = ubifs_budget_space(c, &req);
128 if (err)
129 return err;
130
131 inode = ubifs_new_inode(c, host, S_IFREG | S_IRWXUGO);
132 if (IS_ERR(inode)) {
133 err = PTR_ERR(inode);
134 goto out_budg;
135 }
136
137 /* Re-define all operations to be "nothing" */
138 inode->i_mapping->a_ops = &empty_aops;
139 inode->i_op = &empty_iops;
140 inode->i_fop = &empty_fops;
141
142 inode->i_flags |= S_SYNC | S_NOATIME | S_NOCMTIME;
143 ui = ubifs_inode(inode);
144 ui->xattr = 1;
145 ui->flags |= UBIFS_XATTR_FL;
146 ui->data = kmemdup(value, size, GFP_NOFS);
147 if (!ui->data) {
148 err = -ENOMEM;
149 goto out_free;
150 }
151 inode->i_size = ui->ui_size = size;
152 ui->data_len = size;
153
154 mutex_lock(&host_ui->ui_mutex);
155
156 if (!host->i_nlink) {
157 err = -ENOENT;
158 goto out_noent;
159 }
160
161 host->i_ctime = current_time(host);
162 host_ui->xattr_cnt += 1;
163 host_ui->xattr_size += CALC_DENT_SIZE(fname_len(nm));
164 host_ui->xattr_size += CALC_XATTR_BYTES(size);
165 host_ui->xattr_names += fname_len(nm);
166
167 /*
168 * We handle UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT here because we
169 * have to set the UBIFS_CRYPT_FL flag on the host inode.
170 * To avoid multiple updates of the same inode in the same operation,
171 * let's do it here.
172 */
173 if (strcmp(fname_name(nm), UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT) == 0)
174 host_ui->flags |= UBIFS_CRYPT_FL;
175
176 err = ubifs_jnl_update(c, host, nm, inode, 0, 1);
177 if (err)
178 goto out_cancel;
179 ubifs_set_inode_flags(host);
180 mutex_unlock(&host_ui->ui_mutex);
181
182 ubifs_release_budget(c, &req);
183 insert_inode_hash(inode);
184 iput(inode);
185 return 0;
186
187 out_cancel:
188 host_ui->xattr_cnt -= 1;
189 host_ui->xattr_size -= CALC_DENT_SIZE(fname_len(nm));
190 host_ui->xattr_size -= CALC_XATTR_BYTES(size);
191 host_ui->xattr_names -= fname_len(nm);
192 host_ui->flags &= ~UBIFS_CRYPT_FL;
193 out_noent:
194 mutex_unlock(&host_ui->ui_mutex);
195 out_free:
196 make_bad_inode(inode);
197 iput(inode);
198 out_budg:
199 ubifs_release_budget(c, &req);
200 return err;
201 }
202
203 /**
204 * change_xattr - change an extended attribute.
205 * @c: UBIFS file-system description object
206 * @host: host inode
207 * @inode: extended attribute inode
208 * @value: extended attribute value
209 * @size: size of extended attribute value
210 *
211 * This helper function changes the value of extended attribute @inode with new
212 * data from @value. Returns zero in case of success and a negative error code
213 * in case of failure.
214 */
215 static int change_xattr(struct ubifs_info *c, struct inode *host,
216 struct inode *inode, const void *value, int size)
217 {
218 int err;
219 struct ubifs_inode *host_ui = ubifs_inode(host);
220 struct ubifs_inode *ui = ubifs_inode(inode);
221 void *buf = NULL;
222 int old_size;
223 struct ubifs_budget_req req = { .dirtied_ino = 2,
224 .dirtied_ino_d = ALIGN(size, 8) + ALIGN(host_ui->data_len, 8) };
225
226 ubifs_assert(c, ui->data_len == inode->i_size);
227 err = ubifs_budget_space(c, &req);
228 if (err)
229 return err;
230
231 buf = kmemdup(value, size, GFP_NOFS);
232 if (!buf) {
233 err = -ENOMEM;
234 goto out_free;
235 }
236 mutex_lock(&ui->ui_mutex);
237 kfree(ui->data);
238 ui->data = buf;
239 inode->i_size = ui->ui_size = size;
240 old_size = ui->data_len;
241 ui->data_len = size;
242 mutex_unlock(&ui->ui_mutex);
243
244 mutex_lock(&host_ui->ui_mutex);
245
246 if (!host->i_nlink) {
247 err = -ENOENT;
248 goto out_noent;
249 }
250
251 host->i_ctime = current_time(host);
252 host_ui->xattr_size -= CALC_XATTR_BYTES(old_size);
253 host_ui->xattr_size += CALC_XATTR_BYTES(size);
254
255 /*
256 * It is important to write the host inode after the xattr inode
257 * because if the host inode gets synchronized (via 'fsync()'), then
258 * the extended attribute inode gets synchronized, because it goes
259 * before the host inode in the write-buffer.
260 */
261 err = ubifs_jnl_change_xattr(c, inode, host);
262 if (err)
263 goto out_cancel;
264 mutex_unlock(&host_ui->ui_mutex);
265
266 ubifs_release_budget(c, &req);
267 return 0;
268
269 out_cancel:
270 host_ui->xattr_size -= CALC_XATTR_BYTES(size);
271 host_ui->xattr_size += CALC_XATTR_BYTES(old_size);
272 out_noent:
273 mutex_unlock(&host_ui->ui_mutex);
274 make_bad_inode(inode);
275 out_free:
276 ubifs_release_budget(c, &req);
277 return err;
278 }
279
280 static struct inode *iget_xattr(struct ubifs_info *c, ino_t inum)
281 {
282 struct inode *inode;
283
284 inode = ubifs_iget(c->vfs_sb, inum);
285 if (IS_ERR(inode)) {
286 ubifs_err(c, "dead extended attribute entry, error %d",
287 (int)PTR_ERR(inode));
288 return inode;
289 }
290 if (ubifs_inode(inode)->xattr)
291 return inode;
292 ubifs_err(c, "corrupt extended attribute entry");
293 iput(inode);
294 return ERR_PTR(-EINVAL);
295 }
296
297 int ubifs_xattr_set(struct inode *host, const char *name, const void *value,
298 size_t size, int flags, bool check_lock)
299 {
300 struct inode *inode;
301 struct ubifs_info *c = host->i_sb->s_fs_info;
302 struct fscrypt_name nm = { .disk_name = FSTR_INIT((char *)name, strlen(name))};
303 struct ubifs_dent_node *xent;
304 union ubifs_key key;
305 int err;
306
307 if (check_lock)
308 ubifs_assert(c, inode_is_locked(host));
309
310 if (size > UBIFS_MAX_INO_DATA)
311 return -ERANGE;
312
313 if (fname_len(&nm) > UBIFS_MAX_NLEN)
314 return -ENAMETOOLONG;
315
316 xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
317 if (!xent)
318 return -ENOMEM;
319
320 /*
321 * The extended attribute entries are stored in LNC, so multiple
322 * look-ups do not involve reading the flash.
323 */
324 xent_key_init(c, &key, host->i_ino, &nm);
325 err = ubifs_tnc_lookup_nm(c, &key, xent, &nm);
326 if (err) {
327 if (err != -ENOENT)
328 goto out_free;
329
330 if (flags & XATTR_REPLACE)
331 /* We are asked not to create the xattr */
332 err = -ENODATA;
333 else
334 err = create_xattr(c, host, &nm, value, size);
335 goto out_free;
336 }
337
338 if (flags & XATTR_CREATE) {
339 /* We are asked not to replace the xattr */
340 err = -EEXIST;
341 goto out_free;
342 }
343
344 inode = iget_xattr(c, le64_to_cpu(xent->inum));
345 if (IS_ERR(inode)) {
346 err = PTR_ERR(inode);
347 goto out_free;
348 }
349
350 err = change_xattr(c, host, inode, value, size);
351 iput(inode);
352
353 out_free:
354 kfree(xent);
355 return err;
356 }
357
358 ssize_t ubifs_xattr_get(struct inode *host, const char *name, void *buf,
359 size_t size)
360 {
361 struct inode *inode;
362 struct ubifs_info *c = host->i_sb->s_fs_info;
363 struct fscrypt_name nm = { .disk_name = FSTR_INIT((char *)name, strlen(name))};
364 struct ubifs_inode *ui;
365 struct ubifs_dent_node *xent;
366 union ubifs_key key;
367 int err;
368
369 if (fname_len(&nm) > UBIFS_MAX_NLEN)
370 return -ENAMETOOLONG;
371
372 xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
373 if (!xent)
374 return -ENOMEM;
375
376 xent_key_init(c, &key, host->i_ino, &nm);
377 err = ubifs_tnc_lookup_nm(c, &key, xent, &nm);
378 if (err) {
379 if (err == -ENOENT)
380 err = -ENODATA;
381 goto out_unlock;
382 }
383
384 inode = iget_xattr(c, le64_to_cpu(xent->inum));
385 if (IS_ERR(inode)) {
386 err = PTR_ERR(inode);
387 goto out_unlock;
388 }
389
390 ui = ubifs_inode(inode);
391 ubifs_assert(c, inode->i_size == ui->data_len);
392 ubifs_assert(c, ubifs_inode(host)->xattr_size > ui->data_len);
393
394 mutex_lock(&ui->ui_mutex);
395 if (buf) {
396 /* If @buf is %NULL we are supposed to return the length */
397 if (ui->data_len > size) {
398 err = -ERANGE;
399 goto out_iput;
400 }
401
402 memcpy(buf, ui->data, ui->data_len);
403 }
404 err = ui->data_len;
405
406 out_iput:
407 mutex_unlock(&ui->ui_mutex);
408 iput(inode);
409 out_unlock:
410 kfree(xent);
411 return err;
412 }
413
414 static bool xattr_visible(const char *name)
415 {
416 /* File encryption related xattrs are for internal use only */
417 if (strcmp(name, UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT) == 0)
418 return false;
419
420 /* Show trusted namespace only for "power" users */
421 if (strncmp(name, XATTR_TRUSTED_PREFIX,
422 XATTR_TRUSTED_PREFIX_LEN) == 0 && !capable(CAP_SYS_ADMIN))
423 return false;
424
425 return true;
426 }
427
428 ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size)
429 {
430 union ubifs_key key;
431 struct inode *host = d_inode(dentry);
432 struct ubifs_info *c = host->i_sb->s_fs_info;
433 struct ubifs_inode *host_ui = ubifs_inode(host);
434 struct ubifs_dent_node *xent, *pxent = NULL;
435 int err, len, written = 0;
436 struct fscrypt_name nm = {0};
437
438 dbg_gen("ino %lu ('%pd'), buffer size %zd", host->i_ino,
439 dentry, size);
440
441 len = host_ui->xattr_names + host_ui->xattr_cnt;
442 if (!buffer)
443 /*
444 * We should return the minimum buffer size which will fit a
445 * null-terminated list of all the extended attribute names.
446 */
447 return len;
448
449 if (len > size)
450 return -ERANGE;
451
452 lowest_xent_key(c, &key, host->i_ino);
453 while (1) {
454 xent = ubifs_tnc_next_ent(c, &key, &nm);
455 if (IS_ERR(xent)) {
456 err = PTR_ERR(xent);
457 break;
458 }
459
460 fname_name(&nm) = xent->name;
461 fname_len(&nm) = le16_to_cpu(xent->nlen);
462
463 if (xattr_visible(xent->name)) {
464 memcpy(buffer + written, fname_name(&nm), fname_len(&nm) + 1);
465 written += fname_len(&nm) + 1;
466 }
467
468 kfree(pxent);
469 pxent = xent;
470 key_read(c, &xent->key, &key);
471 }
472
473 kfree(pxent);
474 if (err != -ENOENT) {
475 ubifs_err(c, "cannot find next direntry, error %d", err);
476 return err;
477 }
478
479 ubifs_assert(c, written <= size);
480 return written;
481 }
482
483 static int remove_xattr(struct ubifs_info *c, struct inode *host,
484 struct inode *inode, const struct fscrypt_name *nm)
485 {
486 int err;
487 struct ubifs_inode *host_ui = ubifs_inode(host);
488 struct ubifs_inode *ui = ubifs_inode(inode);
489 struct ubifs_budget_req req = { .dirtied_ino = 2, .mod_dent = 1,
490 .dirtied_ino_d = ALIGN(host_ui->data_len, 8) };
491
492 ubifs_assert(c, ui->data_len == inode->i_size);
493
494 err = ubifs_budget_space(c, &req);
495 if (err)
496 return err;
497
498 mutex_lock(&host_ui->ui_mutex);
499
500 if (!host->i_nlink) {
501 err = -ENOENT;
502 goto out_noent;
503 }
504
505 host->i_ctime = current_time(host);
506 host_ui->xattr_cnt -= 1;
507 host_ui->xattr_size -= CALC_DENT_SIZE(fname_len(nm));
508 host_ui->xattr_size -= CALC_XATTR_BYTES(ui->data_len);
509 host_ui->xattr_names -= fname_len(nm);
510
511 err = ubifs_jnl_delete_xattr(c, host, inode, nm);
512 if (err)
513 goto out_cancel;
514 mutex_unlock(&host_ui->ui_mutex);
515
516 ubifs_release_budget(c, &req);
517 return 0;
518
519 out_cancel:
520 host_ui->xattr_cnt += 1;
521 host_ui->xattr_size += CALC_DENT_SIZE(fname_len(nm));
522 host_ui->xattr_size += CALC_XATTR_BYTES(ui->data_len);
523 host_ui->xattr_names += fname_len(nm);
524 out_noent:
525 mutex_unlock(&host_ui->ui_mutex);
526 ubifs_release_budget(c, &req);
527 make_bad_inode(inode);
528 return err;
529 }
530
531 /**
532 * ubifs_evict_xattr_inode - Evict an xattr inode.
533 * @c: UBIFS file-system description object
534 * @xattr_inum: xattr inode number
535 *
536 * When an inode that hosts xattrs is being removed we have to make sure
537 * that cached inodes of the xattrs also get removed from the inode cache
538 * otherwise we'd waste memory. This function looks up an inode from the
539 * inode cache and clears the link counter such that iput() will evict
540 * the inode.
541 */
542 void ubifs_evict_xattr_inode(struct ubifs_info *c, ino_t xattr_inum)
543 {
544 struct inode *inode;
545
546 inode = ilookup(c->vfs_sb, xattr_inum);
547 if (inode) {
548 clear_nlink(inode);
549 iput(inode);
550 }
551 }
552
553 static int ubifs_xattr_remove(struct inode *host, const char *name)
554 {
555 struct inode *inode;
556 struct ubifs_info *c = host->i_sb->s_fs_info;
557 struct fscrypt_name nm = { .disk_name = FSTR_INIT((char *)name, strlen(name))};
558 struct ubifs_dent_node *xent;
559 union ubifs_key key;
560 int err;
561
562 ubifs_assert(c, inode_is_locked(host));
563
564 if (!host->i_nlink)
565 return -ENOENT;
566
567 if (fname_len(&nm) > UBIFS_MAX_NLEN)
568 return -ENAMETOOLONG;
569
570 xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
571 if (!xent)
572 return -ENOMEM;
573
574 xent_key_init(c, &key, host->i_ino, &nm);
575 err = ubifs_tnc_lookup_nm(c, &key, xent, &nm);
576 if (err) {
577 if (err == -ENOENT)
578 err = -ENODATA;
579 goto out_free;
580 }
581
582 inode = iget_xattr(c, le64_to_cpu(xent->inum));
583 if (IS_ERR(inode)) {
584 err = PTR_ERR(inode);
585 goto out_free;
586 }
587
588 ubifs_assert(c, inode->i_nlink == 1);
589 clear_nlink(inode);
590 err = remove_xattr(c, host, inode, &nm);
591 if (err)
592 set_nlink(inode, 1);
593
594 /* If @i_nlink is 0, 'iput()' will delete the inode */
595 iput(inode);
596
597 out_free:
598 kfree(xent);
599 return err;
600 }
601
602 #ifdef CONFIG_UBIFS_FS_SECURITY
603 static int init_xattrs(struct inode *inode, const struct xattr *xattr_array,
604 void *fs_info)
605 {
606 const struct xattr *xattr;
607 char *name;
608 int err = 0;
609
610 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
611 name = kmalloc(XATTR_SECURITY_PREFIX_LEN +
612 strlen(xattr->name) + 1, GFP_NOFS);
613 if (!name) {
614 err = -ENOMEM;
615 break;
616 }
617 strcpy(name, XATTR_SECURITY_PREFIX);
618 strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
619 /*
620 * creating a new inode without holding the inode rwsem,
621 * no need to check whether inode is locked.
622 */
623 err = ubifs_xattr_set(inode, name, xattr->value,
624 xattr->value_len, 0, false);
625 kfree(name);
626 if (err < 0)
627 break;
628 }
629
630 return err;
631 }
632
633 int ubifs_init_security(struct inode *dentry, struct inode *inode,
634 const struct qstr *qstr)
635 {
636 int err;
637
638 err = security_inode_init_security(inode, dentry, qstr,
639 &init_xattrs, 0);
640 if (err) {
641 struct ubifs_info *c = dentry->i_sb->s_fs_info;
642 ubifs_err(c, "cannot initialize security for inode %lu, error %d",
643 inode->i_ino, err);
644 }
645 return err;
646 }
647 #endif
648
649 static int xattr_get(const struct xattr_handler *handler,
650 struct dentry *dentry, struct inode *inode,
651 const char *name, void *buffer, size_t size)
652 {
653 dbg_gen("xattr '%s', ino %lu ('%pd'), buf size %zd", name,
654 inode->i_ino, dentry, size);
655
656 name = xattr_full_name(handler, name);
657 return ubifs_xattr_get(inode, name, buffer, size);
658 }
659
660 static int xattr_set(const struct xattr_handler *handler,
661 struct dentry *dentry, struct inode *inode,
662 const char *name, const void *value,
663 size_t size, int flags)
664 {
665 dbg_gen("xattr '%s', host ino %lu ('%pd'), size %zd",
666 name, inode->i_ino, dentry, size);
667
668 name = xattr_full_name(handler, name);
669
670 if (value)
671 return ubifs_xattr_set(inode, name, value, size, flags, true);
672 else
673 return ubifs_xattr_remove(inode, name);
674 }
675
676 static const struct xattr_handler ubifs_user_xattr_handler = {
677 .prefix = XATTR_USER_PREFIX,
678 .get = xattr_get,
679 .set = xattr_set,
680 };
681
682 static const struct xattr_handler ubifs_trusted_xattr_handler = {
683 .prefix = XATTR_TRUSTED_PREFIX,
684 .get = xattr_get,
685 .set = xattr_set,
686 };
687
688 #ifdef CONFIG_UBIFS_FS_SECURITY
689 static const struct xattr_handler ubifs_security_xattr_handler = {
690 .prefix = XATTR_SECURITY_PREFIX,
691 .get = xattr_get,
692 .set = xattr_set,
693 };
694 #endif
695
696 const struct xattr_handler *ubifs_xattr_handlers[] = {
697 &ubifs_user_xattr_handler,
698 &ubifs_trusted_xattr_handler,
699 #ifdef CONFIG_UBIFS_FS_SECURITY
700 &ubifs_security_xattr_handler,
701 #endif
702 NULL
703 };