1 /**
2 * eCryptfs: Linux filesystem encryption layer
3 *
4 * Copyright (C) 1997-2004 Erez Zadok
5 * Copyright (C) 2001-2004 Stony Brook University
6 * Copyright (C) 2004-2007 International Business Machines Corp.
7 * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
8 * Michael C. Thompsion <mcthomps@us.ibm.com>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of the
13 * License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
23 * 02111-1307, USA.
24 */
25
26 #include <linux/file.h>
27 #include <linux/vmalloc.h>
28 #include <linux/pagemap.h>
29 #include <linux/dcache.h>
30 #include <linux/namei.h>
31 #include <linux/mount.h>
32 #include <linux/crypto.h>
33 #include <linux/fs_stack.h>
34 #include <linux/slab.h>
35 #include <linux/xattr.h>
36 #include <asm/unaligned.h>
37 #include "ecryptfs_kernel.h"
38
lock_parent(struct dentry * dentry)39 static struct dentry *lock_parent(struct dentry *dentry)
40 {
41 struct dentry *dir;
42
43 dir = dget_parent(dentry);
44 mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
45 return dir;
46 }
47
unlock_dir(struct dentry * dir)48 static void unlock_dir(struct dentry *dir)
49 {
50 mutex_unlock(&dir->d_inode->i_mutex);
51 dput(dir);
52 }
53
ecryptfs_inode_test(struct inode * inode,void * lower_inode)54 static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
55 {
56 if (ecryptfs_inode_to_lower(inode) == (struct inode *)lower_inode)
57 return 1;
58 return 0;
59 }
60
ecryptfs_inode_set(struct inode * inode,void * opaque)61 static int ecryptfs_inode_set(struct inode *inode, void *opaque)
62 {
63 struct inode *lower_inode = opaque;
64
65 ecryptfs_set_inode_lower(inode, lower_inode);
66 fsstack_copy_attr_all(inode, lower_inode);
67 /* i_size will be overwritten for encrypted regular files */
68 fsstack_copy_inode_size(inode, lower_inode);
69 inode->i_ino = lower_inode->i_ino;
70 inode->i_version++;
71 inode->i_mapping->a_ops = &ecryptfs_aops;
72 inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi;
73
74 if (S_ISLNK(inode->i_mode))
75 inode->i_op = &ecryptfs_symlink_iops;
76 else if (S_ISDIR(inode->i_mode))
77 inode->i_op = &ecryptfs_dir_iops;
78 else
79 inode->i_op = &ecryptfs_main_iops;
80
81 if (S_ISDIR(inode->i_mode))
82 inode->i_fop = &ecryptfs_dir_fops;
83 else if (special_file(inode->i_mode))
84 init_special_inode(inode, inode->i_mode, inode->i_rdev);
85 else
86 inode->i_fop = &ecryptfs_main_fops;
87
88 return 0;
89 }
90
__ecryptfs_get_inode(struct inode * lower_inode,struct super_block * sb)91 static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
92 struct super_block *sb)
93 {
94 struct inode *inode;
95
96 if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
97 return ERR_PTR(-EXDEV);
98 if (!igrab(lower_inode))
99 return ERR_PTR(-ESTALE);
100 inode = iget5_locked(sb, (unsigned long)lower_inode,
101 ecryptfs_inode_test, ecryptfs_inode_set,
102 lower_inode);
103 if (!inode) {
104 iput(lower_inode);
105 return ERR_PTR(-EACCES);
106 }
107 if (!(inode->i_state & I_NEW))
108 iput(lower_inode);
109
110 return inode;
111 }
112
ecryptfs_get_inode(struct inode * lower_inode,struct super_block * sb)113 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
114 struct super_block *sb)
115 {
116 struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
117
118 if (!IS_ERR(inode) && (inode->i_state & I_NEW))
119 unlock_new_inode(inode);
120
121 return inode;
122 }
123
124 /**
125 * ecryptfs_interpose
126 * @lower_dentry: Existing dentry in the lower filesystem
127 * @dentry: ecryptfs' dentry
128 * @sb: ecryptfs's super_block
129 *
130 * Interposes upper and lower dentries.
131 *
132 * Returns zero on success; non-zero otherwise
133 */
ecryptfs_interpose(struct dentry * lower_dentry,struct dentry * dentry,struct super_block * sb)134 static int ecryptfs_interpose(struct dentry *lower_dentry,
135 struct dentry *dentry, struct super_block *sb)
136 {
137 struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb);
138
139 if (IS_ERR(inode))
140 return PTR_ERR(inode);
141 d_instantiate(dentry, inode);
142
143 return 0;
144 }
145
ecryptfs_do_unlink(struct inode * dir,struct dentry * dentry,struct inode * inode)146 static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry,
147 struct inode *inode)
148 {
149 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
150 struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
151 struct dentry *lower_dir_dentry;
152 int rc;
153
154 dget(lower_dentry);
155 lower_dir_dentry = lock_parent(lower_dentry);
156 rc = vfs_unlink(lower_dir_inode, lower_dentry);
157 if (rc) {
158 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
159 goto out_unlock;
160 }
161 fsstack_copy_attr_times(dir, lower_dir_inode);
162 set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink);
163 inode->i_ctime = dir->i_ctime;
164 d_drop(dentry);
165 out_unlock:
166 unlock_dir(lower_dir_dentry);
167 dput(lower_dentry);
168 return rc;
169 }
170
171 /**
172 * ecryptfs_do_create
173 * @directory_inode: inode of the new file's dentry's parent in ecryptfs
174 * @ecryptfs_dentry: New file's dentry in ecryptfs
175 * @mode: The mode of the new file
176 * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
177 *
178 * Creates the underlying file and the eCryptfs inode which will link to
179 * it. It will also update the eCryptfs directory inode to mimic the
180 * stat of the lower directory inode.
181 *
182 * Returns the new eCryptfs inode on success; an ERR_PTR on error condition
183 */
184 static struct inode *
ecryptfs_do_create(struct inode * directory_inode,struct dentry * ecryptfs_dentry,umode_t mode)185 ecryptfs_do_create(struct inode *directory_inode,
186 struct dentry *ecryptfs_dentry, umode_t mode)
187 {
188 int rc;
189 struct dentry *lower_dentry;
190 struct dentry *lower_dir_dentry;
191 struct inode *inode;
192
193 lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
194 lower_dir_dentry = lock_parent(lower_dentry);
195 if (IS_ERR(lower_dir_dentry)) {
196 ecryptfs_printk(KERN_ERR, "Error locking directory of "
197 "dentry\n");
198 inode = ERR_CAST(lower_dir_dentry);
199 goto out;
200 }
201 rc = vfs_create(lower_dir_dentry->d_inode, lower_dentry, mode, NULL);
202 if (rc) {
203 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
204 "rc = [%d]\n", __func__, rc);
205 inode = ERR_PTR(rc);
206 goto out_lock;
207 }
208 inode = __ecryptfs_get_inode(lower_dentry->d_inode,
209 directory_inode->i_sb);
210 if (IS_ERR(inode)) {
211 vfs_unlink(lower_dir_dentry->d_inode, lower_dentry);
212 goto out_lock;
213 }
214 fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
215 fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
216 out_lock:
217 unlock_dir(lower_dir_dentry);
218 out:
219 return inode;
220 }
221
222 /**
223 * ecryptfs_initialize_file
224 *
225 * Cause the file to be changed from a basic empty file to an ecryptfs
226 * file with a header and first data page.
227 *
228 * Returns zero on success
229 */
ecryptfs_initialize_file(struct dentry * ecryptfs_dentry,struct inode * ecryptfs_inode)230 int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
231 struct inode *ecryptfs_inode)
232 {
233 struct ecryptfs_crypt_stat *crypt_stat =
234 &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
235 int rc = 0;
236
237 if (S_ISDIR(ecryptfs_inode->i_mode)) {
238 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
239 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
240 goto out;
241 }
242 ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
243 rc = ecryptfs_new_file_context(ecryptfs_inode);
244 if (rc) {
245 ecryptfs_printk(KERN_ERR, "Error creating new file "
246 "context; rc = [%d]\n", rc);
247 goto out;
248 }
249 rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode);
250 if (rc) {
251 printk(KERN_ERR "%s: Error attempting to initialize "
252 "the lower file for the dentry with name "
253 "[%s]; rc = [%d]\n", __func__,
254 ecryptfs_dentry->d_name.name, rc);
255 goto out;
256 }
257 rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode);
258 if (rc)
259 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
260 ecryptfs_put_lower_file(ecryptfs_inode);
261 out:
262 return rc;
263 }
264
265 /**
266 * ecryptfs_create
267 * @dir: The inode of the directory in which to create the file.
268 * @dentry: The eCryptfs dentry
269 * @mode: The mode of the new file.
270 * @nd: nameidata
271 *
272 * Creates a new file.
273 *
274 * Returns zero on success; non-zero on error condition
275 */
276 static int
ecryptfs_create(struct inode * directory_inode,struct dentry * ecryptfs_dentry,umode_t mode,struct nameidata * nd)277 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
278 umode_t mode, struct nameidata *nd)
279 {
280 struct inode *ecryptfs_inode;
281 int rc;
282
283 ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry,
284 mode);
285 if (unlikely(IS_ERR(ecryptfs_inode))) {
286 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
287 "lower filesystem\n");
288 rc = PTR_ERR(ecryptfs_inode);
289 goto out;
290 }
291 /* At this point, a file exists on "disk"; we need to make sure
292 * that this on disk file is prepared to be an ecryptfs file */
293 rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode);
294 if (rc) {
295 ecryptfs_do_unlink(directory_inode, ecryptfs_dentry,
296 ecryptfs_inode);
297 make_bad_inode(ecryptfs_inode);
298 unlock_new_inode(ecryptfs_inode);
299 iput(ecryptfs_inode);
300 goto out;
301 }
302 d_instantiate(ecryptfs_dentry, ecryptfs_inode);
303 unlock_new_inode(ecryptfs_inode);
304 out:
305 return rc;
306 }
307
ecryptfs_i_size_read(struct dentry * dentry,struct inode * inode)308 static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
309 {
310 struct ecryptfs_crypt_stat *crypt_stat;
311 int rc;
312
313 rc = ecryptfs_get_lower_file(dentry, inode);
314 if (rc) {
315 printk(KERN_ERR "%s: Error attempting to initialize "
316 "the lower file for the dentry with name "
317 "[%s]; rc = [%d]\n", __func__,
318 dentry->d_name.name, rc);
319 return rc;
320 }
321
322 crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
323 /* TODO: lock for crypt_stat comparison */
324 if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
325 ecryptfs_set_default_sizes(crypt_stat);
326
327 rc = ecryptfs_read_and_validate_header_region(inode);
328 ecryptfs_put_lower_file(inode);
329 if (rc) {
330 rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
331 if (!rc)
332 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
333 }
334
335 /* Must return 0 to allow non-eCryptfs files to be looked up, too */
336 return 0;
337 }
338
339 /**
340 * ecryptfs_lookup_interpose - Dentry interposition for a lookup
341 */
ecryptfs_lookup_interpose(struct dentry * dentry,struct dentry * lower_dentry,struct inode * dir_inode)342 static int ecryptfs_lookup_interpose(struct dentry *dentry,
343 struct dentry *lower_dentry,
344 struct inode *dir_inode)
345 {
346 struct inode *inode, *lower_inode = lower_dentry->d_inode;
347 struct ecryptfs_dentry_info *dentry_info;
348 struct vfsmount *lower_mnt;
349 int rc = 0;
350
351 lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
352 fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode);
353 BUG_ON(!lower_dentry->d_count);
354
355 dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
356 ecryptfs_set_dentry_private(dentry, dentry_info);
357 if (!dentry_info) {
358 printk(KERN_ERR "%s: Out of memory whilst attempting "
359 "to allocate ecryptfs_dentry_info struct\n",
360 __func__);
361 dput(lower_dentry);
362 mntput(lower_mnt);
363 d_drop(dentry);
364 return -ENOMEM;
365 }
366 ecryptfs_set_dentry_lower(dentry, lower_dentry);
367 ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt);
368
369 if (!lower_dentry->d_inode) {
370 /* We want to add because we couldn't find in lower */
371 d_add(dentry, NULL);
372 return 0;
373 }
374 inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb);
375 if (IS_ERR(inode)) {
376 printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
377 __func__, PTR_ERR(inode));
378 return PTR_ERR(inode);
379 }
380 if (S_ISREG(inode->i_mode)) {
381 rc = ecryptfs_i_size_read(dentry, inode);
382 if (rc) {
383 make_bad_inode(inode);
384 return rc;
385 }
386 }
387
388 if (inode->i_state & I_NEW)
389 unlock_new_inode(inode);
390 d_add(dentry, inode);
391
392 return rc;
393 }
394
395 /**
396 * ecryptfs_lookup
397 * @ecryptfs_dir_inode: The eCryptfs directory inode
398 * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
399 * @ecryptfs_nd: nameidata; may be NULL
400 *
401 * Find a file on disk. If the file does not exist, then we'll add it to the
402 * dentry cache and continue on to read it from the disk.
403 */
ecryptfs_lookup(struct inode * ecryptfs_dir_inode,struct dentry * ecryptfs_dentry,struct nameidata * ecryptfs_nd)404 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
405 struct dentry *ecryptfs_dentry,
406 struct nameidata *ecryptfs_nd)
407 {
408 char *encrypted_and_encoded_name = NULL;
409 size_t encrypted_and_encoded_name_size;
410 struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
411 struct dentry *lower_dir_dentry, *lower_dentry;
412 int rc = 0;
413
414 if ((ecryptfs_dentry->d_name.len == 1
415 && !strcmp(ecryptfs_dentry->d_name.name, "."))
416 || (ecryptfs_dentry->d_name.len == 2
417 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
418 goto out_d_drop;
419 }
420 lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
421 mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
422 lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
423 lower_dir_dentry,
424 ecryptfs_dentry->d_name.len);
425 mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
426 if (IS_ERR(lower_dentry)) {
427 rc = PTR_ERR(lower_dentry);
428 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
429 "[%d] on lower_dentry = [%s]\n", __func__, rc,
430 encrypted_and_encoded_name);
431 goto out_d_drop;
432 }
433 if (lower_dentry->d_inode)
434 goto interpose;
435 mount_crypt_stat = &ecryptfs_superblock_to_private(
436 ecryptfs_dentry->d_sb)->mount_crypt_stat;
437 if (!(mount_crypt_stat
438 && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
439 goto interpose;
440 dput(lower_dentry);
441 rc = ecryptfs_encrypt_and_encode_filename(
442 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
443 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
444 ecryptfs_dentry->d_name.len);
445 if (rc) {
446 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
447 "filename; rc = [%d]\n", __func__, rc);
448 goto out_d_drop;
449 }
450 mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
451 lower_dentry = lookup_one_len(encrypted_and_encoded_name,
452 lower_dir_dentry,
453 encrypted_and_encoded_name_size);
454 mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
455 if (IS_ERR(lower_dentry)) {
456 rc = PTR_ERR(lower_dentry);
457 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
458 "[%d] on lower_dentry = [%s]\n", __func__, rc,
459 encrypted_and_encoded_name);
460 goto out_d_drop;
461 }
462 interpose:
463 rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
464 ecryptfs_dir_inode);
465 goto out;
466 out_d_drop:
467 d_drop(ecryptfs_dentry);
468 out:
469 kfree(encrypted_and_encoded_name);
470 return ERR_PTR(rc);
471 }
472
ecryptfs_link(struct dentry * old_dentry,struct inode * dir,struct dentry * new_dentry)473 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
474 struct dentry *new_dentry)
475 {
476 struct dentry *lower_old_dentry;
477 struct dentry *lower_new_dentry;
478 struct dentry *lower_dir_dentry;
479 u64 file_size_save;
480 int rc;
481
482 file_size_save = i_size_read(old_dentry->d_inode);
483 lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
484 lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
485 dget(lower_old_dentry);
486 dget(lower_new_dentry);
487 lower_dir_dentry = lock_parent(lower_new_dentry);
488 rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
489 lower_new_dentry);
490 if (rc || !lower_new_dentry->d_inode)
491 goto out_lock;
492 rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
493 if (rc)
494 goto out_lock;
495 fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
496 fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
497 set_nlink(old_dentry->d_inode,
498 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink);
499 i_size_write(new_dentry->d_inode, file_size_save);
500 out_lock:
501 unlock_dir(lower_dir_dentry);
502 dput(lower_new_dentry);
503 dput(lower_old_dentry);
504 return rc;
505 }
506
ecryptfs_unlink(struct inode * dir,struct dentry * dentry)507 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
508 {
509 return ecryptfs_do_unlink(dir, dentry, dentry->d_inode);
510 }
511
ecryptfs_symlink(struct inode * dir,struct dentry * dentry,const char * symname)512 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
513 const char *symname)
514 {
515 int rc;
516 struct dentry *lower_dentry;
517 struct dentry *lower_dir_dentry;
518 char *encoded_symname;
519 size_t encoded_symlen;
520 struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
521
522 lower_dentry = ecryptfs_dentry_to_lower(dentry);
523 dget(lower_dentry);
524 lower_dir_dentry = lock_parent(lower_dentry);
525 mount_crypt_stat = &ecryptfs_superblock_to_private(
526 dir->i_sb)->mount_crypt_stat;
527 rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
528 &encoded_symlen,
529 NULL,
530 mount_crypt_stat, symname,
531 strlen(symname));
532 if (rc)
533 goto out_lock;
534 rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
535 encoded_symname);
536 kfree(encoded_symname);
537 if (rc || !lower_dentry->d_inode)
538 goto out_lock;
539 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
540 if (rc)
541 goto out_lock;
542 fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
543 fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
544 out_lock:
545 unlock_dir(lower_dir_dentry);
546 dput(lower_dentry);
547 if (!dentry->d_inode)
548 d_drop(dentry);
549 return rc;
550 }
551
ecryptfs_mkdir(struct inode * dir,struct dentry * dentry,umode_t mode)552 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
553 {
554 int rc;
555 struct dentry *lower_dentry;
556 struct dentry *lower_dir_dentry;
557
558 lower_dentry = ecryptfs_dentry_to_lower(dentry);
559 lower_dir_dentry = lock_parent(lower_dentry);
560 rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
561 if (rc || !lower_dentry->d_inode)
562 goto out;
563 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
564 if (rc)
565 goto out;
566 fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
567 fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
568 set_nlink(dir, lower_dir_dentry->d_inode->i_nlink);
569 out:
570 unlock_dir(lower_dir_dentry);
571 if (!dentry->d_inode)
572 d_drop(dentry);
573 return rc;
574 }
575
ecryptfs_rmdir(struct inode * dir,struct dentry * dentry)576 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
577 {
578 struct dentry *lower_dentry;
579 struct dentry *lower_dir_dentry;
580 int rc;
581
582 lower_dentry = ecryptfs_dentry_to_lower(dentry);
583 dget(dentry);
584 lower_dir_dentry = lock_parent(lower_dentry);
585 dget(lower_dentry);
586 rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
587 dput(lower_dentry);
588 if (!rc && dentry->d_inode)
589 clear_nlink(dentry->d_inode);
590 fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
591 set_nlink(dir, lower_dir_dentry->d_inode->i_nlink);
592 unlock_dir(lower_dir_dentry);
593 if (!rc)
594 d_drop(dentry);
595 dput(dentry);
596 return rc;
597 }
598
599 static int
ecryptfs_mknod(struct inode * dir,struct dentry * dentry,umode_t mode,dev_t dev)600 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
601 {
602 int rc;
603 struct dentry *lower_dentry;
604 struct dentry *lower_dir_dentry;
605
606 lower_dentry = ecryptfs_dentry_to_lower(dentry);
607 lower_dir_dentry = lock_parent(lower_dentry);
608 rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
609 if (rc || !lower_dentry->d_inode)
610 goto out;
611 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
612 if (rc)
613 goto out;
614 fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
615 fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
616 out:
617 unlock_dir(lower_dir_dentry);
618 if (!dentry->d_inode)
619 d_drop(dentry);
620 return rc;
621 }
622
623 static int
ecryptfs_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry)624 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
625 struct inode *new_dir, struct dentry *new_dentry)
626 {
627 int rc;
628 struct dentry *lower_old_dentry;
629 struct dentry *lower_new_dentry;
630 struct dentry *lower_old_dir_dentry;
631 struct dentry *lower_new_dir_dentry;
632 struct dentry *trap = NULL;
633 struct inode *target_inode;
634
635 lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
636 lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
637 dget(lower_old_dentry);
638 dget(lower_new_dentry);
639 lower_old_dir_dentry = dget_parent(lower_old_dentry);
640 lower_new_dir_dentry = dget_parent(lower_new_dentry);
641 target_inode = new_dentry->d_inode;
642 trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
643 /* source should not be ancestor of target */
644 if (trap == lower_old_dentry) {
645 rc = -EINVAL;
646 goto out_lock;
647 }
648 /* target should not be ancestor of source */
649 if (trap == lower_new_dentry) {
650 rc = -ENOTEMPTY;
651 goto out_lock;
652 }
653 rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
654 lower_new_dir_dentry->d_inode, lower_new_dentry);
655 if (rc)
656 goto out_lock;
657 if (target_inode)
658 fsstack_copy_attr_all(target_inode,
659 ecryptfs_inode_to_lower(target_inode));
660 fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
661 if (new_dir != old_dir)
662 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
663 out_lock:
664 unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
665 dput(lower_new_dir_dentry);
666 dput(lower_old_dir_dentry);
667 dput(lower_new_dentry);
668 dput(lower_old_dentry);
669 return rc;
670 }
671
ecryptfs_readlink_lower(struct dentry * dentry,char ** buf,size_t * bufsiz)672 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
673 size_t *bufsiz)
674 {
675 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
676 char *lower_buf;
677 size_t lower_bufsiz = PATH_MAX;
678 mm_segment_t old_fs;
679 int rc;
680
681 lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
682 if (!lower_buf) {
683 rc = -ENOMEM;
684 goto out;
685 }
686 old_fs = get_fs();
687 set_fs(get_ds());
688 rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
689 (char __user *)lower_buf,
690 lower_bufsiz);
691 set_fs(old_fs);
692 if (rc < 0)
693 goto out;
694 lower_bufsiz = rc;
695 rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
696 lower_buf, lower_bufsiz);
697 out:
698 kfree(lower_buf);
699 return rc;
700 }
701
702 static int
ecryptfs_readlink(struct dentry * dentry,char __user * buf,int bufsiz)703 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
704 {
705 char *kbuf;
706 size_t kbufsiz, copied;
707 int rc;
708
709 rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
710 if (rc)
711 goto out;
712 copied = min_t(size_t, bufsiz, kbufsiz);
713 rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
714 kfree(kbuf);
715 fsstack_copy_attr_atime(dentry->d_inode,
716 ecryptfs_dentry_to_lower(dentry)->d_inode);
717 out:
718 return rc;
719 }
720
ecryptfs_follow_link(struct dentry * dentry,struct nameidata * nd)721 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
722 {
723 char *buf;
724 int len = PAGE_SIZE, rc;
725 mm_segment_t old_fs;
726
727 /* Released in ecryptfs_put_link(); only release here on error */
728 buf = kmalloc(len, GFP_KERNEL);
729 if (!buf) {
730 buf = ERR_PTR(-ENOMEM);
731 goto out;
732 }
733 old_fs = get_fs();
734 set_fs(get_ds());
735 rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
736 set_fs(old_fs);
737 if (rc < 0) {
738 kfree(buf);
739 buf = ERR_PTR(rc);
740 } else
741 buf[rc] = '\0';
742 out:
743 nd_set_link(nd, buf);
744 return NULL;
745 }
746
747 static void
ecryptfs_put_link(struct dentry * dentry,struct nameidata * nd,void * ptr)748 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
749 {
750 char *buf = nd_get_link(nd);
751 if (!IS_ERR(buf)) {
752 /* Free the char* */
753 kfree(buf);
754 }
755 }
756
757 /**
758 * upper_size_to_lower_size
759 * @crypt_stat: Crypt_stat associated with file
760 * @upper_size: Size of the upper file
761 *
762 * Calculate the required size of the lower file based on the
763 * specified size of the upper file. This calculation is based on the
764 * number of headers in the underlying file and the extent size.
765 *
766 * Returns Calculated size of the lower file.
767 */
768 static loff_t
upper_size_to_lower_size(struct ecryptfs_crypt_stat * crypt_stat,loff_t upper_size)769 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
770 loff_t upper_size)
771 {
772 loff_t lower_size;
773
774 lower_size = ecryptfs_lower_header_size(crypt_stat);
775 if (upper_size != 0) {
776 loff_t num_extents;
777
778 num_extents = upper_size >> crypt_stat->extent_shift;
779 if (upper_size & ~crypt_stat->extent_mask)
780 num_extents++;
781 lower_size += (num_extents * crypt_stat->extent_size);
782 }
783 return lower_size;
784 }
785
786 /**
787 * truncate_upper
788 * @dentry: The ecryptfs layer dentry
789 * @ia: Address of the ecryptfs inode's attributes
790 * @lower_ia: Address of the lower inode's attributes
791 *
792 * Function to handle truncations modifying the size of the file. Note
793 * that the file sizes are interpolated. When expanding, we are simply
794 * writing strings of 0's out. When truncating, we truncate the upper
795 * inode and update the lower_ia according to the page index
796 * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
797 * the caller must use lower_ia in a call to notify_change() to perform
798 * the truncation of the lower inode.
799 *
800 * Returns zero on success; non-zero otherwise
801 */
truncate_upper(struct dentry * dentry,struct iattr * ia,struct iattr * lower_ia)802 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
803 struct iattr *lower_ia)
804 {
805 int rc = 0;
806 struct inode *inode = dentry->d_inode;
807 struct ecryptfs_crypt_stat *crypt_stat;
808 loff_t i_size = i_size_read(inode);
809 loff_t lower_size_before_truncate;
810 loff_t lower_size_after_truncate;
811
812 if (unlikely((ia->ia_size == i_size))) {
813 lower_ia->ia_valid &= ~ATTR_SIZE;
814 return 0;
815 }
816 rc = ecryptfs_get_lower_file(dentry, inode);
817 if (rc)
818 return rc;
819 crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
820 /* Switch on growing or shrinking file */
821 if (ia->ia_size > i_size) {
822 char zero[] = { 0x00 };
823
824 lower_ia->ia_valid &= ~ATTR_SIZE;
825 /* Write a single 0 at the last position of the file;
826 * this triggers code that will fill in 0's throughout
827 * the intermediate portion of the previous end of the
828 * file and the new and of the file */
829 rc = ecryptfs_write(inode, zero,
830 (ia->ia_size - 1), 1);
831 } else { /* ia->ia_size < i_size_read(inode) */
832 /* We're chopping off all the pages down to the page
833 * in which ia->ia_size is located. Fill in the end of
834 * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
835 * PAGE_CACHE_SIZE with zeros. */
836 size_t num_zeros = (PAGE_CACHE_SIZE
837 - (ia->ia_size & ~PAGE_CACHE_MASK));
838
839 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
840 truncate_setsize(inode, ia->ia_size);
841 lower_ia->ia_size = ia->ia_size;
842 lower_ia->ia_valid |= ATTR_SIZE;
843 goto out;
844 }
845 if (num_zeros) {
846 char *zeros_virt;
847
848 zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
849 if (!zeros_virt) {
850 rc = -ENOMEM;
851 goto out;
852 }
853 rc = ecryptfs_write(inode, zeros_virt,
854 ia->ia_size, num_zeros);
855 kfree(zeros_virt);
856 if (rc) {
857 printk(KERN_ERR "Error attempting to zero out "
858 "the remainder of the end page on "
859 "reducing truncate; rc = [%d]\n", rc);
860 goto out;
861 }
862 }
863 truncate_setsize(inode, ia->ia_size);
864 rc = ecryptfs_write_inode_size_to_metadata(inode);
865 if (rc) {
866 printk(KERN_ERR "Problem with "
867 "ecryptfs_write_inode_size_to_metadata; "
868 "rc = [%d]\n", rc);
869 goto out;
870 }
871 /* We are reducing the size of the ecryptfs file, and need to
872 * know if we need to reduce the size of the lower file. */
873 lower_size_before_truncate =
874 upper_size_to_lower_size(crypt_stat, i_size);
875 lower_size_after_truncate =
876 upper_size_to_lower_size(crypt_stat, ia->ia_size);
877 if (lower_size_after_truncate < lower_size_before_truncate) {
878 lower_ia->ia_size = lower_size_after_truncate;
879 lower_ia->ia_valid |= ATTR_SIZE;
880 } else
881 lower_ia->ia_valid &= ~ATTR_SIZE;
882 }
883 out:
884 ecryptfs_put_lower_file(inode);
885 return rc;
886 }
887
ecryptfs_inode_newsize_ok(struct inode * inode,loff_t offset)888 static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset)
889 {
890 struct ecryptfs_crypt_stat *crypt_stat;
891 loff_t lower_oldsize, lower_newsize;
892
893 crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
894 lower_oldsize = upper_size_to_lower_size(crypt_stat,
895 i_size_read(inode));
896 lower_newsize = upper_size_to_lower_size(crypt_stat, offset);
897 if (lower_newsize > lower_oldsize) {
898 /*
899 * The eCryptfs inode and the new *lower* size are mixed here
900 * because we may not have the lower i_mutex held and/or it may
901 * not be appropriate to call inode_newsize_ok() with inodes
902 * from other filesystems.
903 */
904 return inode_newsize_ok(inode, lower_newsize);
905 }
906
907 return 0;
908 }
909
910 /**
911 * ecryptfs_truncate
912 * @dentry: The ecryptfs layer dentry
913 * @new_length: The length to expand the file to
914 *
915 * Simple function that handles the truncation of an eCryptfs inode and
916 * its corresponding lower inode.
917 *
918 * Returns zero on success; non-zero otherwise
919 */
ecryptfs_truncate(struct dentry * dentry,loff_t new_length)920 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
921 {
922 struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
923 struct iattr lower_ia = { .ia_valid = 0 };
924 int rc;
925
926 rc = ecryptfs_inode_newsize_ok(dentry->d_inode, new_length);
927 if (rc)
928 return rc;
929
930 rc = truncate_upper(dentry, &ia, &lower_ia);
931 if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
932 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
933
934 mutex_lock(&lower_dentry->d_inode->i_mutex);
935 rc = notify_change(lower_dentry, &lower_ia);
936 mutex_unlock(&lower_dentry->d_inode->i_mutex);
937 }
938 return rc;
939 }
940
941 static int
ecryptfs_permission(struct inode * inode,int mask)942 ecryptfs_permission(struct inode *inode, int mask)
943 {
944 return inode_permission(ecryptfs_inode_to_lower(inode), mask);
945 }
946
947 /**
948 * ecryptfs_setattr
949 * @dentry: dentry handle to the inode to modify
950 * @ia: Structure with flags of what to change and values
951 *
952 * Updates the metadata of an inode. If the update is to the size
953 * i.e. truncation, then ecryptfs_truncate will handle the size modification
954 * of both the ecryptfs inode and the lower inode.
955 *
956 * All other metadata changes will be passed right to the lower filesystem,
957 * and we will just update our inode to look like the lower.
958 */
ecryptfs_setattr(struct dentry * dentry,struct iattr * ia)959 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
960 {
961 int rc = 0;
962 struct dentry *lower_dentry;
963 struct iattr lower_ia;
964 struct inode *inode;
965 struct inode *lower_inode;
966 struct ecryptfs_crypt_stat *crypt_stat;
967
968 crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
969 if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
970 ecryptfs_init_crypt_stat(crypt_stat);
971 inode = dentry->d_inode;
972 lower_inode = ecryptfs_inode_to_lower(inode);
973 lower_dentry = ecryptfs_dentry_to_lower(dentry);
974 mutex_lock(&crypt_stat->cs_mutex);
975 if (S_ISDIR(dentry->d_inode->i_mode))
976 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
977 else if (S_ISREG(dentry->d_inode->i_mode)
978 && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
979 || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
980 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
981
982 mount_crypt_stat = &ecryptfs_superblock_to_private(
983 dentry->d_sb)->mount_crypt_stat;
984 rc = ecryptfs_get_lower_file(dentry, inode);
985 if (rc) {
986 mutex_unlock(&crypt_stat->cs_mutex);
987 goto out;
988 }
989 rc = ecryptfs_read_metadata(dentry);
990 ecryptfs_put_lower_file(inode);
991 if (rc) {
992 if (!(mount_crypt_stat->flags
993 & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
994 rc = -EIO;
995 printk(KERN_WARNING "Either the lower file "
996 "is not in a valid eCryptfs format, "
997 "or the key could not be retrieved. "
998 "Plaintext passthrough mode is not "
999 "enabled; returning -EIO\n");
1000 mutex_unlock(&crypt_stat->cs_mutex);
1001 goto out;
1002 }
1003 rc = 0;
1004 crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
1005 | ECRYPTFS_ENCRYPTED);
1006 }
1007 }
1008 mutex_unlock(&crypt_stat->cs_mutex);
1009
1010 rc = inode_change_ok(inode, ia);
1011 if (rc)
1012 goto out;
1013 if (ia->ia_valid & ATTR_SIZE) {
1014 rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size);
1015 if (rc)
1016 goto out;
1017 }
1018
1019 memcpy(&lower_ia, ia, sizeof(lower_ia));
1020 if (ia->ia_valid & ATTR_FILE)
1021 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
1022 if (ia->ia_valid & ATTR_SIZE) {
1023 rc = truncate_upper(dentry, ia, &lower_ia);
1024 if (rc < 0)
1025 goto out;
1026 }
1027
1028 /*
1029 * mode change is for clearing setuid/setgid bits. Allow lower fs
1030 * to interpret this in its own way.
1031 */
1032 if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1033 lower_ia.ia_valid &= ~ATTR_MODE;
1034
1035 mutex_lock(&lower_dentry->d_inode->i_mutex);
1036 rc = notify_change(lower_dentry, &lower_ia);
1037 mutex_unlock(&lower_dentry->d_inode->i_mutex);
1038 out:
1039 fsstack_copy_attr_all(inode, lower_inode);
1040 return rc;
1041 }
1042
ecryptfs_getattr_link(struct vfsmount * mnt,struct dentry * dentry,struct kstat * stat)1043 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1044 struct kstat *stat)
1045 {
1046 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1047 int rc = 0;
1048
1049 mount_crypt_stat = &ecryptfs_superblock_to_private(
1050 dentry->d_sb)->mount_crypt_stat;
1051 generic_fillattr(dentry->d_inode, stat);
1052 if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1053 char *target;
1054 size_t targetsiz;
1055
1056 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1057 if (!rc) {
1058 kfree(target);
1059 stat->size = targetsiz;
1060 }
1061 }
1062 return rc;
1063 }
1064
ecryptfs_getattr(struct vfsmount * mnt,struct dentry * dentry,struct kstat * stat)1065 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1066 struct kstat *stat)
1067 {
1068 struct kstat lower_stat;
1069 int rc;
1070
1071 rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1072 ecryptfs_dentry_to_lower(dentry), &lower_stat);
1073 if (!rc) {
1074 fsstack_copy_attr_all(dentry->d_inode,
1075 ecryptfs_inode_to_lower(dentry->d_inode));
1076 generic_fillattr(dentry->d_inode, stat);
1077 stat->blocks = lower_stat.blocks;
1078 }
1079 return rc;
1080 }
1081
1082 int
ecryptfs_setxattr(struct dentry * dentry,const char * name,const void * value,size_t size,int flags)1083 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1084 size_t size, int flags)
1085 {
1086 int rc = 0;
1087 struct dentry *lower_dentry;
1088
1089 lower_dentry = ecryptfs_dentry_to_lower(dentry);
1090 if (!lower_dentry->d_inode->i_op->setxattr) {
1091 rc = -EOPNOTSUPP;
1092 goto out;
1093 }
1094
1095 rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1096 if (!rc)
1097 fsstack_copy_attr_all(dentry->d_inode, lower_dentry->d_inode);
1098 out:
1099 return rc;
1100 }
1101
1102 ssize_t
ecryptfs_getxattr_lower(struct dentry * lower_dentry,const char * name,void * value,size_t size)1103 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1104 void *value, size_t size)
1105 {
1106 int rc = 0;
1107
1108 if (!lower_dentry->d_inode->i_op->getxattr) {
1109 rc = -EOPNOTSUPP;
1110 goto out;
1111 }
1112 mutex_lock(&lower_dentry->d_inode->i_mutex);
1113 rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1114 size);
1115 mutex_unlock(&lower_dentry->d_inode->i_mutex);
1116 out:
1117 return rc;
1118 }
1119
1120 static ssize_t
ecryptfs_getxattr(struct dentry * dentry,const char * name,void * value,size_t size)1121 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1122 size_t size)
1123 {
1124 return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1125 value, size);
1126 }
1127
1128 static ssize_t
ecryptfs_listxattr(struct dentry * dentry,char * list,size_t size)1129 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1130 {
1131 int rc = 0;
1132 struct dentry *lower_dentry;
1133
1134 lower_dentry = ecryptfs_dentry_to_lower(dentry);
1135 if (!lower_dentry->d_inode->i_op->listxattr) {
1136 rc = -EOPNOTSUPP;
1137 goto out;
1138 }
1139 mutex_lock(&lower_dentry->d_inode->i_mutex);
1140 rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1141 mutex_unlock(&lower_dentry->d_inode->i_mutex);
1142 out:
1143 return rc;
1144 }
1145
ecryptfs_removexattr(struct dentry * dentry,const char * name)1146 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1147 {
1148 int rc = 0;
1149 struct dentry *lower_dentry;
1150
1151 lower_dentry = ecryptfs_dentry_to_lower(dentry);
1152 if (!lower_dentry->d_inode->i_op->removexattr) {
1153 rc = -EOPNOTSUPP;
1154 goto out;
1155 }
1156 mutex_lock(&lower_dentry->d_inode->i_mutex);
1157 rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1158 mutex_unlock(&lower_dentry->d_inode->i_mutex);
1159 out:
1160 return rc;
1161 }
1162
1163 const struct inode_operations ecryptfs_symlink_iops = {
1164 .readlink = ecryptfs_readlink,
1165 .follow_link = ecryptfs_follow_link,
1166 .put_link = ecryptfs_put_link,
1167 .permission = ecryptfs_permission,
1168 .setattr = ecryptfs_setattr,
1169 .getattr = ecryptfs_getattr_link,
1170 .setxattr = ecryptfs_setxattr,
1171 .getxattr = ecryptfs_getxattr,
1172 .listxattr = ecryptfs_listxattr,
1173 .removexattr = ecryptfs_removexattr
1174 };
1175
1176 const struct inode_operations ecryptfs_dir_iops = {
1177 .create = ecryptfs_create,
1178 .lookup = ecryptfs_lookup,
1179 .link = ecryptfs_link,
1180 .unlink = ecryptfs_unlink,
1181 .symlink = ecryptfs_symlink,
1182 .mkdir = ecryptfs_mkdir,
1183 .rmdir = ecryptfs_rmdir,
1184 .mknod = ecryptfs_mknod,
1185 .rename = ecryptfs_rename,
1186 .permission = ecryptfs_permission,
1187 .setattr = ecryptfs_setattr,
1188 .setxattr = ecryptfs_setxattr,
1189 .getxattr = ecryptfs_getxattr,
1190 .listxattr = ecryptfs_listxattr,
1191 .removexattr = ecryptfs_removexattr
1192 };
1193
1194 const struct inode_operations ecryptfs_main_iops = {
1195 .permission = ecryptfs_permission,
1196 .setattr = ecryptfs_setattr,
1197 .getattr = ecryptfs_getattr,
1198 .setxattr = ecryptfs_setxattr,
1199 .getxattr = ecryptfs_getxattr,
1200 .listxattr = ecryptfs_listxattr,
1201 .removexattr = ecryptfs_removexattr
1202 };
1203