Commit | Line | Data |
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1e51764a AB |
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 <linux/xattr.h> | |
59 | #include <linux/posix_acl_xattr.h> | |
60 | #include "ubifs.h" | |
61 | ||
62 | /* | |
63 | * Limit the number of extended attributes per inode so that the total size | |
c78c7e35 | 64 | * (@xattr_size) is guaranteeded to fit in an 'unsigned int'. |
1e51764a AB |
65 | */ |
66 | #define MAX_XATTRS_PER_INODE 65535 | |
67 | ||
68 | /* | |
69 | * Extended attribute type constants. | |
70 | * | |
71 | * USER_XATTR: user extended attribute ("user.*") | |
72 | * TRUSTED_XATTR: trusted extended attribute ("trusted.*) | |
73 | * SECURITY_XATTR: security extended attribute ("security.*") | |
74 | */ | |
75 | enum { | |
76 | USER_XATTR, | |
77 | TRUSTED_XATTR, | |
78 | SECURITY_XATTR, | |
79 | }; | |
80 | ||
81 | static struct inode_operations none_inode_operations; | |
82 | static struct address_space_operations none_address_operations; | |
83 | static struct file_operations none_file_operations; | |
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; | |
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, | |
5acd6ff8 ZS |
106 | .new_ino_d = ALIGN(size, 8), .dirtied_ino = 1, |
107 | .dirtied_ino_d = ALIGN(host_ui->data_len, 8) }; | |
1e51764a AB |
108 | |
109 | if (host_ui->xattr_cnt >= MAX_XATTRS_PER_INODE) | |
110 | return -ENOSPC; | |
111 | /* | |
112 | * Linux limits the maximum size of the extended attribute names list | |
c78c7e35 | 113 | * to %XATTR_LIST_MAX. This means we should not allow creating more |
1e51764a AB |
114 | * extended attributes if the name list becomes larger. This limitation |
115 | * is artificial for UBIFS, though. | |
116 | */ | |
117 | if (host_ui->xattr_names + host_ui->xattr_cnt + | |
118 | nm->len + 1 > XATTR_LIST_MAX) | |
119 | return -ENOSPC; | |
120 | ||
121 | err = ubifs_budget_space(c, &req); | |
122 | if (err) | |
123 | return err; | |
124 | ||
125 | inode = ubifs_new_inode(c, host, S_IFREG | S_IRWXUGO); | |
126 | if (IS_ERR(inode)) { | |
127 | err = PTR_ERR(inode); | |
128 | goto out_budg; | |
129 | } | |
130 | ||
1e51764a AB |
131 | /* Re-define all operations to be "nothing" */ |
132 | inode->i_mapping->a_ops = &none_address_operations; | |
133 | inode->i_op = &none_inode_operations; | |
134 | inode->i_fop = &none_file_operations; | |
135 | ||
136 | inode->i_flags |= S_SYNC | S_NOATIME | S_NOCMTIME | S_NOQUOTA; | |
137 | ui = ubifs_inode(inode); | |
138 | ui->xattr = 1; | |
139 | ui->flags |= UBIFS_XATTR_FL; | |
140 | ui->data = kmalloc(size, GFP_NOFS); | |
141 | if (!ui->data) { | |
142 | err = -ENOMEM; | |
c78c7e35 | 143 | goto out_free; |
1e51764a | 144 | } |
1e51764a | 145 | memcpy(ui->data, value, size); |
c78c7e35 AB |
146 | inode->i_size = ui->ui_size = size; |
147 | ui->data_len = size; | |
148 | ||
149 | mutex_lock(&host_ui->ui_mutex); | |
1e51764a AB |
150 | host->i_ctime = ubifs_current_time(host); |
151 | host_ui->xattr_cnt += 1; | |
152 | host_ui->xattr_size += CALC_DENT_SIZE(nm->len); | |
153 | host_ui->xattr_size += CALC_XATTR_BYTES(size); | |
154 | host_ui->xattr_names += nm->len; | |
155 | ||
1e51764a AB |
156 | err = ubifs_jnl_update(c, host, nm, inode, 0, 1); |
157 | if (err) | |
158 | goto out_cancel; | |
159 | mutex_unlock(&host_ui->ui_mutex); | |
160 | ||
161 | ubifs_release_budget(c, &req); | |
162 | insert_inode_hash(inode); | |
163 | iput(inode); | |
164 | return 0; | |
165 | ||
166 | out_cancel: | |
167 | host_ui->xattr_cnt -= 1; | |
168 | host_ui->xattr_size -= CALC_DENT_SIZE(nm->len); | |
169 | host_ui->xattr_size -= CALC_XATTR_BYTES(size); | |
1e51764a | 170 | mutex_unlock(&host_ui->ui_mutex); |
c78c7e35 | 171 | out_free: |
1e51764a AB |
172 | make_bad_inode(inode); |
173 | iput(inode); | |
174 | out_budg: | |
175 | ubifs_release_budget(c, &req); | |
176 | return err; | |
177 | } | |
178 | ||
179 | /** | |
180 | * change_xattr - change an extended attribute. | |
181 | * @c: UBIFS file-system description object | |
182 | * @host: host inode | |
183 | * @inode: extended attribute inode | |
184 | * @value: extended attribute value | |
185 | * @size: size of extended attribute value | |
186 | * | |
187 | * This helper function changes the value of extended attribute @inode with new | |
188 | * data from @value. Returns zero in case of success and a negative error code | |
189 | * in case of failure. | |
190 | */ | |
191 | static int change_xattr(struct ubifs_info *c, struct inode *host, | |
192 | struct inode *inode, const void *value, int size) | |
193 | { | |
194 | int err; | |
195 | struct ubifs_inode *host_ui = ubifs_inode(host); | |
196 | struct ubifs_inode *ui = ubifs_inode(inode); | |
197 | struct ubifs_budget_req req = { .dirtied_ino = 2, | |
5acd6ff8 | 198 | .dirtied_ino_d = ALIGN(size, 8) + ALIGN(host_ui->data_len, 8) }; |
1e51764a AB |
199 | |
200 | ubifs_assert(ui->data_len == inode->i_size); | |
201 | err = ubifs_budget_space(c, &req); | |
202 | if (err) | |
203 | return err; | |
204 | ||
1e51764a AB |
205 | kfree(ui->data); |
206 | ui->data = kmalloc(size, GFP_NOFS); | |
207 | if (!ui->data) { | |
208 | err = -ENOMEM; | |
c78c7e35 | 209 | goto out_free; |
1e51764a | 210 | } |
1e51764a AB |
211 | memcpy(ui->data, value, size); |
212 | inode->i_size = ui->ui_size = size; | |
213 | ui->data_len = size; | |
214 | ||
c78c7e35 AB |
215 | mutex_lock(&host_ui->ui_mutex); |
216 | host->i_ctime = ubifs_current_time(host); | |
217 | host_ui->xattr_size -= CALC_XATTR_BYTES(ui->data_len); | |
218 | host_ui->xattr_size += CALC_XATTR_BYTES(size); | |
219 | ||
1e51764a AB |
220 | /* |
221 | * It is important to write the host inode after the xattr inode | |
222 | * because if the host inode gets synchronized (via 'fsync()'), then | |
223 | * the extended attribute inode gets synchronized, because it goes | |
224 | * before the host inode in the write-buffer. | |
225 | */ | |
226 | err = ubifs_jnl_change_xattr(c, inode, host); | |
227 | if (err) | |
228 | goto out_cancel; | |
229 | mutex_unlock(&host_ui->ui_mutex); | |
230 | ||
231 | ubifs_release_budget(c, &req); | |
232 | return 0; | |
233 | ||
234 | out_cancel: | |
235 | host_ui->xattr_size -= CALC_XATTR_BYTES(size); | |
236 | host_ui->xattr_size += CALC_XATTR_BYTES(ui->data_len); | |
1e51764a | 237 | mutex_unlock(&host_ui->ui_mutex); |
c78c7e35 AB |
238 | make_bad_inode(inode); |
239 | out_free: | |
1e51764a AB |
240 | ubifs_release_budget(c, &req); |
241 | return err; | |
242 | } | |
243 | ||
244 | /** | |
245 | * check_namespace - check extended attribute name-space. | |
246 | * @nm: extended attribute name | |
247 | * | |
248 | * This function makes sure the extended attribute name belongs to one of the | |
249 | * supported extended attribute name-spaces. Returns name-space index in case | |
250 | * of success and a negative error code in case of failure. | |
251 | */ | |
252 | static int check_namespace(const struct qstr *nm) | |
253 | { | |
254 | int type; | |
255 | ||
256 | if (nm->len > UBIFS_MAX_NLEN) | |
257 | return -ENAMETOOLONG; | |
258 | ||
259 | if (!strncmp(nm->name, XATTR_TRUSTED_PREFIX, | |
260 | XATTR_TRUSTED_PREFIX_LEN)) { | |
261 | if (nm->name[sizeof(XATTR_TRUSTED_PREFIX) - 1] == '\0') | |
262 | return -EINVAL; | |
263 | type = TRUSTED_XATTR; | |
264 | } else if (!strncmp(nm->name, XATTR_USER_PREFIX, | |
265 | XATTR_USER_PREFIX_LEN)) { | |
266 | if (nm->name[XATTR_USER_PREFIX_LEN] == '\0') | |
267 | return -EINVAL; | |
268 | type = USER_XATTR; | |
269 | } else if (!strncmp(nm->name, XATTR_SECURITY_PREFIX, | |
270 | XATTR_SECURITY_PREFIX_LEN)) { | |
271 | if (nm->name[sizeof(XATTR_SECURITY_PREFIX) - 1] == '\0') | |
272 | return -EINVAL; | |
273 | type = SECURITY_XATTR; | |
274 | } else | |
275 | return -EOPNOTSUPP; | |
276 | ||
277 | return type; | |
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("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("corrupt extended attribute entry"); | |
293 | iput(inode); | |
294 | return ERR_PTR(-EINVAL); | |
295 | } | |
296 | ||
297 | int ubifs_setxattr(struct dentry *dentry, const char *name, | |
298 | const void *value, size_t size, int flags) | |
299 | { | |
300 | struct inode *inode, *host = dentry->d_inode; | |
301 | struct ubifs_info *c = host->i_sb->s_fs_info; | |
302 | struct qstr nm = { .name = name, .len = strlen(name) }; | |
303 | struct ubifs_dent_node *xent; | |
304 | union ubifs_key key; | |
305 | int err, type; | |
306 | ||
307 | dbg_gen("xattr '%s', host ino %lu ('%.*s'), size %zd", name, | |
308 | host->i_ino, dentry->d_name.len, dentry->d_name.name, size); | |
c78c7e35 | 309 | ubifs_assert(mutex_is_locked(&host->i_mutex)); |
1e51764a AB |
310 | |
311 | if (size > UBIFS_MAX_INO_DATA) | |
312 | return -ERANGE; | |
313 | ||
314 | type = check_namespace(&nm); | |
315 | if (type < 0) | |
316 | return type; | |
317 | ||
318 | xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS); | |
319 | if (!xent) | |
320 | return -ENOMEM; | |
321 | ||
322 | /* | |
323 | * The extended attribute entries are stored in LNC, so multiple | |
324 | * look-ups do not involve reading the flash. | |
325 | */ | |
326 | xent_key_init(c, &key, host->i_ino, &nm); | |
327 | err = ubifs_tnc_lookup_nm(c, &key, xent, &nm); | |
328 | if (err) { | |
329 | if (err != -ENOENT) | |
330 | goto out_free; | |
331 | ||
332 | if (flags & XATTR_REPLACE) | |
333 | /* We are asked not to create the xattr */ | |
334 | err = -ENODATA; | |
335 | else | |
336 | err = create_xattr(c, host, &nm, value, size); | |
337 | goto out_free; | |
338 | } | |
339 | ||
340 | if (flags & XATTR_CREATE) { | |
341 | /* We are asked not to replace the xattr */ | |
342 | err = -EEXIST; | |
343 | goto out_free; | |
344 | } | |
345 | ||
346 | inode = iget_xattr(c, le64_to_cpu(xent->inum)); | |
347 | if (IS_ERR(inode)) { | |
348 | err = PTR_ERR(inode); | |
349 | goto out_free; | |
350 | } | |
351 | ||
352 | err = change_xattr(c, host, inode, value, size); | |
353 | iput(inode); | |
354 | ||
355 | out_free: | |
356 | kfree(xent); | |
357 | return err; | |
358 | } | |
359 | ||
360 | ssize_t ubifs_getxattr(struct dentry *dentry, const char *name, void *buf, | |
361 | size_t size) | |
362 | { | |
363 | struct inode *inode, *host = dentry->d_inode; | |
364 | struct ubifs_info *c = host->i_sb->s_fs_info; | |
365 | struct qstr nm = { .name = name, .len = strlen(name) }; | |
366 | struct ubifs_inode *ui; | |
367 | struct ubifs_dent_node *xent; | |
368 | union ubifs_key key; | |
369 | int err; | |
370 | ||
371 | dbg_gen("xattr '%s', ino %lu ('%.*s'), buf size %zd", name, | |
372 | host->i_ino, dentry->d_name.len, dentry->d_name.name, size); | |
373 | ||
374 | err = check_namespace(&nm); | |
375 | if (err < 0) | |
376 | return err; | |
377 | ||
378 | xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS); | |
379 | if (!xent) | |
380 | return -ENOMEM; | |
381 | ||
1e51764a AB |
382 | xent_key_init(c, &key, host->i_ino, &nm); |
383 | err = ubifs_tnc_lookup_nm(c, &key, xent, &nm); | |
384 | if (err) { | |
385 | if (err == -ENOENT) | |
386 | err = -ENODATA; | |
387 | goto out_unlock; | |
388 | } | |
389 | ||
390 | inode = iget_xattr(c, le64_to_cpu(xent->inum)); | |
391 | if (IS_ERR(inode)) { | |
392 | err = PTR_ERR(inode); | |
393 | goto out_unlock; | |
394 | } | |
395 | ||
396 | ui = ubifs_inode(inode); | |
397 | ubifs_assert(inode->i_size == ui->data_len); | |
398 | ubifs_assert(ubifs_inode(host)->xattr_size > ui->data_len); | |
399 | ||
400 | if (buf) { | |
401 | /* If @buf is %NULL we are supposed to return the length */ | |
402 | if (ui->data_len > size) { | |
403 | dbg_err("buffer size %zd, xattr len %d", | |
404 | size, ui->data_len); | |
405 | err = -ERANGE; | |
406 | goto out_iput; | |
407 | } | |
408 | ||
409 | memcpy(buf, ui->data, ui->data_len); | |
410 | } | |
411 | err = ui->data_len; | |
412 | ||
413 | out_iput: | |
414 | iput(inode); | |
415 | out_unlock: | |
1e51764a AB |
416 | kfree(xent); |
417 | return err; | |
418 | } | |
419 | ||
420 | ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size) | |
421 | { | |
422 | union ubifs_key key; | |
423 | struct inode *host = dentry->d_inode; | |
424 | struct ubifs_info *c = host->i_sb->s_fs_info; | |
425 | struct ubifs_inode *host_ui = ubifs_inode(host); | |
426 | struct ubifs_dent_node *xent, *pxent = NULL; | |
427 | int err, len, written = 0; | |
428 | struct qstr nm = { .name = NULL }; | |
429 | ||
430 | dbg_gen("ino %lu ('%.*s'), buffer size %zd", host->i_ino, | |
431 | dentry->d_name.len, dentry->d_name.name, size); | |
432 | ||
433 | len = host_ui->xattr_names + host_ui->xattr_cnt; | |
434 | if (!buffer) | |
435 | /* | |
436 | * We should return the minimum buffer size which will fit a | |
437 | * null-terminated list of all the extended attribute names. | |
438 | */ | |
439 | return len; | |
440 | ||
441 | if (len > size) | |
442 | return -ERANGE; | |
443 | ||
444 | lowest_xent_key(c, &key, host->i_ino); | |
1e51764a AB |
445 | while (1) { |
446 | int type; | |
447 | ||
448 | xent = ubifs_tnc_next_ent(c, &key, &nm); | |
8d47aef4 | 449 | if (IS_ERR(xent)) { |
1e51764a AB |
450 | err = PTR_ERR(xent); |
451 | break; | |
452 | } | |
453 | ||
454 | nm.name = xent->name; | |
455 | nm.len = le16_to_cpu(xent->nlen); | |
456 | ||
457 | type = check_namespace(&nm); | |
458 | if (unlikely(type < 0)) { | |
459 | err = type; | |
460 | break; | |
461 | } | |
462 | ||
463 | /* Show trusted namespace only for "power" users */ | |
464 | if (type != TRUSTED_XATTR || capable(CAP_SYS_ADMIN)) { | |
465 | memcpy(buffer + written, nm.name, nm.len + 1); | |
466 | written += nm.len + 1; | |
467 | } | |
468 | ||
469 | kfree(pxent); | |
470 | pxent = xent; | |
471 | key_read(c, &xent->key, &key); | |
472 | } | |
1e51764a AB |
473 | |
474 | kfree(pxent); | |
475 | if (err != -ENOENT) { | |
476 | ubifs_err("cannot find next direntry, error %d", err); | |
477 | return err; | |
478 | } | |
479 | ||
480 | ubifs_assert(written <= size); | |
481 | return written; | |
482 | } | |
483 | ||
484 | static int remove_xattr(struct ubifs_info *c, struct inode *host, | |
485 | struct inode *inode, const struct qstr *nm) | |
486 | { | |
487 | int err; | |
488 | struct ubifs_inode *host_ui = ubifs_inode(host); | |
489 | struct ubifs_inode *ui = ubifs_inode(inode); | |
5acd6ff8 ZS |
490 | struct ubifs_budget_req req = { .dirtied_ino = 2, .mod_dent = 1, |
491 | .dirtied_ino_d = ALIGN(host_ui->data_len, 8) }; | |
1e51764a AB |
492 | |
493 | ubifs_assert(ui->data_len == inode->i_size); | |
494 | ||
495 | err = ubifs_budget_space(c, &req); | |
496 | if (err) | |
497 | return err; | |
498 | ||
499 | mutex_lock(&host_ui->ui_mutex); | |
500 | host->i_ctime = ubifs_current_time(host); | |
501 | host_ui->xattr_cnt -= 1; | |
502 | host_ui->xattr_size -= CALC_DENT_SIZE(nm->len); | |
503 | host_ui->xattr_size -= CALC_XATTR_BYTES(ui->data_len); | |
504 | host_ui->xattr_names -= nm->len; | |
505 | ||
506 | err = ubifs_jnl_delete_xattr(c, host, inode, nm); | |
507 | if (err) | |
508 | goto out_cancel; | |
509 | mutex_unlock(&host_ui->ui_mutex); | |
510 | ||
511 | ubifs_release_budget(c, &req); | |
512 | return 0; | |
513 | ||
514 | out_cancel: | |
515 | host_ui->xattr_cnt += 1; | |
516 | host_ui->xattr_size += CALC_DENT_SIZE(nm->len); | |
517 | host_ui->xattr_size += CALC_XATTR_BYTES(ui->data_len); | |
518 | mutex_unlock(&host_ui->ui_mutex); | |
519 | ubifs_release_budget(c, &req); | |
520 | make_bad_inode(inode); | |
521 | return err; | |
522 | } | |
523 | ||
524 | int ubifs_removexattr(struct dentry *dentry, const char *name) | |
525 | { | |
526 | struct inode *inode, *host = dentry->d_inode; | |
527 | struct ubifs_info *c = host->i_sb->s_fs_info; | |
528 | struct qstr nm = { .name = name, .len = strlen(name) }; | |
529 | struct ubifs_dent_node *xent; | |
530 | union ubifs_key key; | |
531 | int err; | |
532 | ||
533 | dbg_gen("xattr '%s', ino %lu ('%.*s')", name, | |
534 | host->i_ino, dentry->d_name.len, dentry->d_name.name); | |
535 | ubifs_assert(mutex_is_locked(&host->i_mutex)); | |
536 | ||
537 | err = check_namespace(&nm); | |
538 | if (err < 0) | |
539 | return err; | |
540 | ||
541 | xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS); | |
542 | if (!xent) | |
543 | return -ENOMEM; | |
544 | ||
545 | xent_key_init(c, &key, host->i_ino, &nm); | |
546 | err = ubifs_tnc_lookup_nm(c, &key, xent, &nm); | |
547 | if (err) { | |
548 | if (err == -ENOENT) | |
549 | err = -ENODATA; | |
550 | goto out_free; | |
551 | } | |
552 | ||
553 | inode = iget_xattr(c, le64_to_cpu(xent->inum)); | |
554 | if (IS_ERR(inode)) { | |
555 | err = PTR_ERR(inode); | |
556 | goto out_free; | |
557 | } | |
558 | ||
559 | ubifs_assert(inode->i_nlink == 1); | |
560 | inode->i_nlink = 0; | |
561 | err = remove_xattr(c, host, inode, &nm); | |
562 | if (err) | |
563 | inode->i_nlink = 1; | |
564 | ||
565 | /* If @i_nlink is 0, 'iput()' will delete the inode */ | |
566 | iput(inode); | |
567 | ||
568 | out_free: | |
569 | kfree(xent); | |
570 | return err; | |
571 | } |