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TOMOYO Linux Cross Reference
Linux/fs/ubifs/xattr.c

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.11 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.84 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.154 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.201 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.201 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.77 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 qstr *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 + nm->len + 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 | S_NOQUOTA;
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         host->i_ctime = ubifs_current_time(host);
156         host_ui->xattr_cnt += 1;
157         host_ui->xattr_size += CALC_DENT_SIZE(nm->len);
158         host_ui->xattr_size += CALC_XATTR_BYTES(size);
159         host_ui->xattr_names += nm->len;
160 
161         err = ubifs_jnl_update(c, host, nm, inode, 0, 1);
162         if (err)
163                 goto out_cancel;
164         mutex_unlock(&host_ui->ui_mutex);
165 
166         ubifs_release_budget(c, &req);
167         insert_inode_hash(inode);
168         iput(inode);
169         return 0;
170 
171 out_cancel:
172         host_ui->xattr_cnt -= 1;
173         host_ui->xattr_size -= CALC_DENT_SIZE(nm->len);
174         host_ui->xattr_size -= CALC_XATTR_BYTES(size);
175         host_ui->xattr_names -= nm->len;
176         mutex_unlock(&host_ui->ui_mutex);
177 out_free:
178         make_bad_inode(inode);
179         iput(inode);
180 out_budg:
181         ubifs_release_budget(c, &req);
182         return err;
183 }
184 
185 /**
186  * change_xattr - change an extended attribute.
187  * @c: UBIFS file-system description object
188  * @host: host inode
189  * @inode: extended attribute inode
190  * @value: extended attribute value
191  * @size: size of extended attribute value
192  *
193  * This helper function changes the value of extended attribute @inode with new
194  * data from @value. Returns zero in case of success and a negative error code
195  * in case of failure.
196  */
197 static int change_xattr(struct ubifs_info *c, struct inode *host,
198                         struct inode *inode, const void *value, int size)
199 {
200         int err;
201         struct ubifs_inode *host_ui = ubifs_inode(host);
202         struct ubifs_inode *ui = ubifs_inode(inode);
203         void *buf = NULL;
204         struct ubifs_budget_req req = { .dirtied_ino = 2,
205                 .dirtied_ino_d = ALIGN(size, 8) + ALIGN(host_ui->data_len, 8) };
206 
207         ubifs_assert(ui->data_len == inode->i_size);
208         err = ubifs_budget_space(c, &req);
209         if (err)
210                 return err;
211 
212         buf = kmemdup(value, size, GFP_NOFS);
213         if (!buf) {
214                 err = -ENOMEM;
215                 goto out_free;
216         }
217         mutex_lock(&ui->ui_mutex);
218         kfree(ui->data);
219         ui->data = buf;
220         inode->i_size = ui->ui_size = size;
221         ui->data_len = size;
222         mutex_unlock(&ui->ui_mutex);
223 
224         mutex_lock(&host_ui->ui_mutex);
225         host->i_ctime = ubifs_current_time(host);
226         host_ui->xattr_size -= CALC_XATTR_BYTES(ui->data_len);
227         host_ui->xattr_size += CALC_XATTR_BYTES(size);
228 
229         /*
230          * It is important to write the host inode after the xattr inode
231          * because if the host inode gets synchronized (via 'fsync()'), then
232          * the extended attribute inode gets synchronized, because it goes
233          * before the host inode in the write-buffer.
234          */
235         err = ubifs_jnl_change_xattr(c, inode, host);
236         if (err)
237                 goto out_cancel;
238         mutex_unlock(&host_ui->ui_mutex);
239 
240         ubifs_release_budget(c, &req);
241         return 0;
242 
243 out_cancel:
244         host_ui->xattr_size -= CALC_XATTR_BYTES(size);
245         host_ui->xattr_size += CALC_XATTR_BYTES(ui->data_len);
246         mutex_unlock(&host_ui->ui_mutex);
247         make_bad_inode(inode);
248 out_free:
249         ubifs_release_budget(c, &req);
250         return err;
251 }
252 
253 static struct inode *iget_xattr(struct ubifs_info *c, ino_t inum)
254 {
255         struct inode *inode;
256 
257         inode = ubifs_iget(c->vfs_sb, inum);
258         if (IS_ERR(inode)) {
259                 ubifs_err(c, "dead extended attribute entry, error %d",
260                           (int)PTR_ERR(inode));
261                 return inode;
262         }
263         if (ubifs_inode(inode)->xattr)
264                 return inode;
265         ubifs_err(c, "corrupt extended attribute entry");
266         iput(inode);
267         return ERR_PTR(-EINVAL);
268 }
269 
270 static int __ubifs_setxattr(struct inode *host, const char *name,
271                             const void *value, size_t size, int flags)
272 {
273         struct inode *inode;
274         struct ubifs_info *c = host->i_sb->s_fs_info;
275         struct qstr nm = QSTR_INIT(name, strlen(name));
276         struct ubifs_dent_node *xent;
277         union ubifs_key key;
278         int err;
279 
280         ubifs_assert(inode_is_locked(host));
281 
282         if (size > UBIFS_MAX_INO_DATA)
283                 return -ERANGE;
284 
285         if (nm.len > UBIFS_MAX_NLEN)
286                 return -ENAMETOOLONG;
287 
288         xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
289         if (!xent)
290                 return -ENOMEM;
291 
292         /*
293          * The extended attribute entries are stored in LNC, so multiple
294          * look-ups do not involve reading the flash.
295          */
296         xent_key_init(c, &key, host->i_ino, &nm);
297         err = ubifs_tnc_lookup_nm(c, &key, xent, &nm);
298         if (err) {
299                 if (err != -ENOENT)
300                         goto out_free;
301 
302                 if (flags & XATTR_REPLACE)
303                         /* We are asked not to create the xattr */
304                         err = -ENODATA;
305                 else
306                         err = create_xattr(c, host, &nm, value, size);
307                 goto out_free;
308         }
309 
310         if (flags & XATTR_CREATE) {
311                 /* We are asked not to replace the xattr */
312                 err = -EEXIST;
313                 goto out_free;
314         }
315 
316         inode = iget_xattr(c, le64_to_cpu(xent->inum));
317         if (IS_ERR(inode)) {
318                 err = PTR_ERR(inode);
319                 goto out_free;
320         }
321 
322         err = change_xattr(c, host, inode, value, size);
323         iput(inode);
324 
325 out_free:
326         kfree(xent);
327         return err;
328 }
329 
330 static ssize_t __ubifs_getxattr(struct inode *host, const char *name,
331                                 void *buf, size_t size)
332 {
333         struct inode *inode;
334         struct ubifs_info *c = host->i_sb->s_fs_info;
335         struct qstr nm = QSTR_INIT(name, strlen(name));
336         struct ubifs_inode *ui;
337         struct ubifs_dent_node *xent;
338         union ubifs_key key;
339         int err;
340 
341         if (nm.len > UBIFS_MAX_NLEN)
342                 return -ENAMETOOLONG;
343 
344         xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
345         if (!xent)
346                 return -ENOMEM;
347 
348         xent_key_init(c, &key, host->i_ino, &nm);
349         err = ubifs_tnc_lookup_nm(c, &key, xent, &nm);
350         if (err) {
351                 if (err == -ENOENT)
352                         err = -ENODATA;
353                 goto out_unlock;
354         }
355 
356         inode = iget_xattr(c, le64_to_cpu(xent->inum));
357         if (IS_ERR(inode)) {
358                 err = PTR_ERR(inode);
359                 goto out_unlock;
360         }
361 
362         ui = ubifs_inode(inode);
363         ubifs_assert(inode->i_size == ui->data_len);
364         ubifs_assert(ubifs_inode(host)->xattr_size > ui->data_len);
365 
366         mutex_lock(&ui->ui_mutex);
367         if (buf) {
368                 /* If @buf is %NULL we are supposed to return the length */
369                 if (ui->data_len > size) {
370                         ubifs_err(c, "buffer size %zd, xattr len %d",
371                                   size, ui->data_len);
372                         err = -ERANGE;
373                         goto out_iput;
374                 }
375 
376                 memcpy(buf, ui->data, ui->data_len);
377         }
378         err = ui->data_len;
379 
380 out_iput:
381         mutex_unlock(&ui->ui_mutex);
382         iput(inode);
383 out_unlock:
384         kfree(xent);
385         return err;
386 }
387 
388 ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size)
389 {
390         union ubifs_key key;
391         struct inode *host = d_inode(dentry);
392         struct ubifs_info *c = host->i_sb->s_fs_info;
393         struct ubifs_inode *host_ui = ubifs_inode(host);
394         struct ubifs_dent_node *xent, *pxent = NULL;
395         int err, len, written = 0;
396         struct qstr nm = { .name = NULL };
397 
398         dbg_gen("ino %lu ('%pd'), buffer size %zd", host->i_ino,
399                 dentry, size);
400 
401         len = host_ui->xattr_names + host_ui->xattr_cnt;
402         if (!buffer)
403                 /*
404                  * We should return the minimum buffer size which will fit a
405                  * null-terminated list of all the extended attribute names.
406                  */
407                 return len;
408 
409         if (len > size)
410                 return -ERANGE;
411 
412         lowest_xent_key(c, &key, host->i_ino);
413         while (1) {
414                 xent = ubifs_tnc_next_ent(c, &key, &nm);
415                 if (IS_ERR(xent)) {
416                         err = PTR_ERR(xent);
417                         break;
418                 }
419 
420                 nm.name = xent->name;
421                 nm.len = le16_to_cpu(xent->nlen);
422 
423                 /* Show trusted namespace only for "power" users */
424                 if (strncmp(xent->name, XATTR_TRUSTED_PREFIX,
425                             XATTR_TRUSTED_PREFIX_LEN) ||
426                     capable(CAP_SYS_ADMIN)) {
427                         memcpy(buffer + written, nm.name, nm.len + 1);
428                         written += nm.len + 1;
429                 }
430 
431                 kfree(pxent);
432                 pxent = xent;
433                 key_read(c, &xent->key, &key);
434         }
435 
436         kfree(pxent);
437         if (err != -ENOENT) {
438                 ubifs_err(c, "cannot find next direntry, error %d", err);
439                 return err;
440         }
441 
442         ubifs_assert(written <= size);
443         return written;
444 }
445 
446 static int remove_xattr(struct ubifs_info *c, struct inode *host,
447                         struct inode *inode, const struct qstr *nm)
448 {
449         int err;
450         struct ubifs_inode *host_ui = ubifs_inode(host);
451         struct ubifs_inode *ui = ubifs_inode(inode);
452         struct ubifs_budget_req req = { .dirtied_ino = 2, .mod_dent = 1,
453                                 .dirtied_ino_d = ALIGN(host_ui->data_len, 8) };
454 
455         ubifs_assert(ui->data_len == inode->i_size);
456 
457         err = ubifs_budget_space(c, &req);
458         if (err)
459                 return err;
460 
461         mutex_lock(&host_ui->ui_mutex);
462         host->i_ctime = ubifs_current_time(host);
463         host_ui->xattr_cnt -= 1;
464         host_ui->xattr_size -= CALC_DENT_SIZE(nm->len);
465         host_ui->xattr_size -= CALC_XATTR_BYTES(ui->data_len);
466         host_ui->xattr_names -= nm->len;
467 
468         err = ubifs_jnl_delete_xattr(c, host, inode, nm);
469         if (err)
470                 goto out_cancel;
471         mutex_unlock(&host_ui->ui_mutex);
472 
473         ubifs_release_budget(c, &req);
474         return 0;
475 
476 out_cancel:
477         host_ui->xattr_cnt += 1;
478         host_ui->xattr_size += CALC_DENT_SIZE(nm->len);
479         host_ui->xattr_size += CALC_XATTR_BYTES(ui->data_len);
480         host_ui->xattr_names += nm->len;
481         mutex_unlock(&host_ui->ui_mutex);
482         ubifs_release_budget(c, &req);
483         make_bad_inode(inode);
484         return err;
485 }
486 
487 static int __ubifs_removexattr(struct inode *host, const char *name)
488 {
489         struct inode *inode;
490         struct ubifs_info *c = host->i_sb->s_fs_info;
491         struct qstr nm = QSTR_INIT(name, strlen(name));
492         struct ubifs_dent_node *xent;
493         union ubifs_key key;
494         int err;
495 
496         ubifs_assert(inode_is_locked(host));
497 
498         if (nm.len > UBIFS_MAX_NLEN)
499                 return -ENAMETOOLONG;
500 
501         xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
502         if (!xent)
503                 return -ENOMEM;
504 
505         xent_key_init(c, &key, host->i_ino, &nm);
506         err = ubifs_tnc_lookup_nm(c, &key, xent, &nm);
507         if (err) {
508                 if (err == -ENOENT)
509                         err = -ENODATA;
510                 goto out_free;
511         }
512 
513         inode = iget_xattr(c, le64_to_cpu(xent->inum));
514         if (IS_ERR(inode)) {
515                 err = PTR_ERR(inode);
516                 goto out_free;
517         }
518 
519         ubifs_assert(inode->i_nlink == 1);
520         clear_nlink(inode);
521         err = remove_xattr(c, host, inode, &nm);
522         if (err)
523                 set_nlink(inode, 1);
524 
525         /* If @i_nlink is 0, 'iput()' will delete the inode */
526         iput(inode);
527 
528 out_free:
529         kfree(xent);
530         return err;
531 }
532 
533 static int init_xattrs(struct inode *inode, const struct xattr *xattr_array,
534                       void *fs_info)
535 {
536         const struct xattr *xattr;
537         char *name;
538         int err = 0;
539 
540         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
541                 name = kmalloc(XATTR_SECURITY_PREFIX_LEN +
542                                strlen(xattr->name) + 1, GFP_NOFS);
543                 if (!name) {
544                         err = -ENOMEM;
545                         break;
546                 }
547                 strcpy(name, XATTR_SECURITY_PREFIX);
548                 strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
549                 err = __ubifs_setxattr(inode, name, xattr->value, xattr->value_len, 0);
550                 kfree(name);
551                 if (err < 0)
552                         break;
553         }
554 
555         return err;
556 }
557 
558 int ubifs_init_security(struct inode *dentry, struct inode *inode,
559                         const struct qstr *qstr)
560 {
561         int err;
562 
563         err = security_inode_init_security(inode, dentry, qstr,
564                                            &init_xattrs, 0);
565         if (err) {
566                 struct ubifs_info *c = dentry->i_sb->s_fs_info;
567                 ubifs_err(c, "cannot initialize security for inode %lu, error %d",
568                           inode->i_ino, err);
569         }
570         return err;
571 }
572 
573 static int ubifs_xattr_get(const struct xattr_handler *handler,
574                            struct dentry *dentry, struct inode *inode,
575                            const char *name, void *buffer, size_t size)
576 {
577         dbg_gen("xattr '%s', ino %lu ('%pd'), buf size %zd", name,
578                 inode->i_ino, dentry, size);
579 
580         name = xattr_full_name(handler, name);
581         return __ubifs_getxattr(inode, name, buffer, size);
582 }
583 
584 static int ubifs_xattr_set(const struct xattr_handler *handler,
585                            struct dentry *dentry, struct inode *inode,
586                            const char *name, const void *value,
587                            size_t size, int flags)
588 {
589         dbg_gen("xattr '%s', host ino %lu ('%pd'), size %zd",
590                 name, inode->i_ino, dentry, size);
591 
592         name = xattr_full_name(handler, name);
593 
594         if (value)
595                 return __ubifs_setxattr(inode, name, value, size, flags);
596         else
597                 return __ubifs_removexattr(inode, name);
598 }
599 
600 static const struct xattr_handler ubifs_user_xattr_handler = {
601         .prefix = XATTR_USER_PREFIX,
602         .get = ubifs_xattr_get,
603         .set = ubifs_xattr_set,
604 };
605 
606 static const struct xattr_handler ubifs_trusted_xattr_handler = {
607         .prefix = XATTR_TRUSTED_PREFIX,
608         .get = ubifs_xattr_get,
609         .set = ubifs_xattr_set,
610 };
611 
612 static const struct xattr_handler ubifs_security_xattr_handler = {
613         .prefix = XATTR_SECURITY_PREFIX,
614         .get = ubifs_xattr_get,
615         .set = ubifs_xattr_set,
616 };
617 
618 const struct xattr_handler *ubifs_xattr_handlers[] = {
619         &ubifs_user_xattr_handler,
620         &ubifs_trusted_xattr_handler,
621         &ubifs_security_xattr_handler,
622         NULL
623 };
624 

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