eCryptfs: Check inode changes in setattr
[linux-2.6.git] / fs / ecryptfs / inode.c
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
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
48 static void unlock_dir(struct dentry *dir)
49 {
50         mutex_unlock(&dir->d_inode->i_mutex);
51         dput(dir);
52 }
53
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
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
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
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  */
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
146 /**
147  * ecryptfs_create_underlying_file
148  * @lower_dir_inode: inode of the parent in the lower fs of the new file
149  * @dentry: New file's dentry
150  * @mode: The mode of the new file
151  *
152  * Creates the file in the lower file system.
153  *
154  * Returns zero on success; non-zero on error condition
155  */
156 static int
157 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
158                                 struct dentry *dentry, int mode)
159 {
160         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
161         return vfs_create(lower_dir_inode, lower_dentry, mode, NULL);
162 }
163
164 /**
165  * ecryptfs_do_create
166  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
167  * @ecryptfs_dentry: New file's dentry in ecryptfs
168  * @mode: The mode of the new file
169  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
170  *
171  * Creates the underlying file and the eCryptfs inode which will link to
172  * it. It will also update the eCryptfs directory inode to mimic the
173  * stat of the lower directory inode.
174  *
175  * Returns the new eCryptfs inode on success; an ERR_PTR on error condition
176  */
177 static struct inode *
178 ecryptfs_do_create(struct inode *directory_inode,
179                    struct dentry *ecryptfs_dentry, int mode)
180 {
181         int rc;
182         struct dentry *lower_dentry;
183         struct dentry *lower_dir_dentry;
184         struct inode *inode;
185
186         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
187         lower_dir_dentry = lock_parent(lower_dentry);
188         if (IS_ERR(lower_dir_dentry)) {
189                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
190                                 "dentry\n");
191                 inode = ERR_CAST(lower_dir_dentry);
192                 goto out;
193         }
194         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
195                                              ecryptfs_dentry, mode);
196         if (rc) {
197                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
198                        "rc = [%d]\n", __func__, rc);
199                 inode = ERR_PTR(rc);
200                 goto out_lock;
201         }
202         inode = __ecryptfs_get_inode(lower_dentry->d_inode,
203                                      directory_inode->i_sb);
204         if (IS_ERR(inode))
205                 goto out_lock;
206         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
207         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
208 out_lock:
209         unlock_dir(lower_dir_dentry);
210 out:
211         return inode;
212 }
213
214 /**
215  * ecryptfs_initialize_file
216  *
217  * Cause the file to be changed from a basic empty file to an ecryptfs
218  * file with a header and first data page.
219  *
220  * Returns zero on success
221  */
222 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
223                                     struct inode *ecryptfs_inode)
224 {
225         struct ecryptfs_crypt_stat *crypt_stat =
226                 &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
227         int rc = 0;
228
229         if (S_ISDIR(ecryptfs_inode->i_mode)) {
230                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
231                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
232                 goto out;
233         }
234         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
235         rc = ecryptfs_new_file_context(ecryptfs_inode);
236         if (rc) {
237                 ecryptfs_printk(KERN_ERR, "Error creating new file "
238                                 "context; rc = [%d]\n", rc);
239                 goto out;
240         }
241         rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode);
242         if (rc) {
243                 printk(KERN_ERR "%s: Error attempting to initialize "
244                         "the lower file for the dentry with name "
245                         "[%s]; rc = [%d]\n", __func__,
246                         ecryptfs_dentry->d_name.name, rc);
247                 goto out;
248         }
249         rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode);
250         if (rc)
251                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
252         ecryptfs_put_lower_file(ecryptfs_inode);
253 out:
254         return rc;
255 }
256
257 /**
258  * ecryptfs_create
259  * @dir: The inode of the directory in which to create the file.
260  * @dentry: The eCryptfs dentry
261  * @mode: The mode of the new file.
262  * @nd: nameidata
263  *
264  * Creates a new file.
265  *
266  * Returns zero on success; non-zero on error condition
267  */
268 static int
269 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
270                 int mode, struct nameidata *nd)
271 {
272         struct inode *ecryptfs_inode;
273         int rc;
274
275         ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry,
276                                             mode);
277         if (unlikely(IS_ERR(ecryptfs_inode))) {
278                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
279                                 "lower filesystem\n");
280                 rc = PTR_ERR(ecryptfs_inode);
281                 goto out;
282         }
283         /* At this point, a file exists on "disk"; we need to make sure
284          * that this on disk file is prepared to be an ecryptfs file */
285         rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode);
286         if (rc) {
287                 drop_nlink(ecryptfs_inode);
288                 unlock_new_inode(ecryptfs_inode);
289                 iput(ecryptfs_inode);
290                 goto out;
291         }
292         d_instantiate(ecryptfs_dentry, ecryptfs_inode);
293         unlock_new_inode(ecryptfs_inode);
294 out:
295         return rc;
296 }
297
298 static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
299 {
300         struct ecryptfs_crypt_stat *crypt_stat;
301         int rc;
302
303         rc = ecryptfs_get_lower_file(dentry, inode);
304         if (rc) {
305                 printk(KERN_ERR "%s: Error attempting to initialize "
306                         "the lower file for the dentry with name "
307                         "[%s]; rc = [%d]\n", __func__,
308                         dentry->d_name.name, rc);
309                 return rc;
310         }
311
312         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
313         /* TODO: lock for crypt_stat comparison */
314         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
315                 ecryptfs_set_default_sizes(crypt_stat);
316
317         rc = ecryptfs_read_and_validate_header_region(inode);
318         ecryptfs_put_lower_file(inode);
319         if (rc) {
320                 rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
321                 if (!rc)
322                         crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
323         }
324
325         /* Must return 0 to allow non-eCryptfs files to be looked up, too */
326         return 0;
327 }
328
329 /**
330  * ecryptfs_lookup_interpose - Dentry interposition for a lookup
331  */
332 static int ecryptfs_lookup_interpose(struct dentry *dentry,
333                                      struct dentry *lower_dentry,
334                                      struct inode *dir_inode)
335 {
336         struct inode *inode, *lower_inode = lower_dentry->d_inode;
337         struct ecryptfs_dentry_info *dentry_info;
338         struct vfsmount *lower_mnt;
339         int rc = 0;
340
341         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
342         fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode);
343         BUG_ON(!lower_dentry->d_count);
344
345         dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
346         ecryptfs_set_dentry_private(dentry, dentry_info);
347         if (!dentry_info) {
348                 printk(KERN_ERR "%s: Out of memory whilst attempting "
349                        "to allocate ecryptfs_dentry_info struct\n",
350                         __func__);
351                 dput(lower_dentry);
352                 mntput(lower_mnt);
353                 d_drop(dentry);
354                 return -ENOMEM;
355         }
356         ecryptfs_set_dentry_lower(dentry, lower_dentry);
357         ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt);
358
359         if (!lower_dentry->d_inode) {
360                 /* We want to add because we couldn't find in lower */
361                 d_add(dentry, NULL);
362                 return 0;
363         }
364         inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb);
365         if (IS_ERR(inode)) {
366                 printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
367                        __func__, PTR_ERR(inode));
368                 return PTR_ERR(inode);
369         }
370         if (S_ISREG(inode->i_mode)) {
371                 rc = ecryptfs_i_size_read(dentry, inode);
372                 if (rc) {
373                         make_bad_inode(inode);
374                         return rc;
375                 }
376         }
377
378         if (inode->i_state & I_NEW)
379                 unlock_new_inode(inode);
380         d_add(dentry, inode);
381
382         return rc;
383 }
384
385 /**
386  * ecryptfs_lookup
387  * @ecryptfs_dir_inode: The eCryptfs directory inode
388  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
389  * @ecryptfs_nd: nameidata; may be NULL
390  *
391  * Find a file on disk. If the file does not exist, then we'll add it to the
392  * dentry cache and continue on to read it from the disk.
393  */
394 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
395                                       struct dentry *ecryptfs_dentry,
396                                       struct nameidata *ecryptfs_nd)
397 {
398         char *encrypted_and_encoded_name = NULL;
399         size_t encrypted_and_encoded_name_size;
400         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
401         struct dentry *lower_dir_dentry, *lower_dentry;
402         int rc = 0;
403
404         if ((ecryptfs_dentry->d_name.len == 1
405              && !strcmp(ecryptfs_dentry->d_name.name, "."))
406             || (ecryptfs_dentry->d_name.len == 2
407                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
408                 goto out_d_drop;
409         }
410         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
411         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
412         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
413                                       lower_dir_dentry,
414                                       ecryptfs_dentry->d_name.len);
415         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
416         if (IS_ERR(lower_dentry)) {
417                 rc = PTR_ERR(lower_dentry);
418                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
419                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
420                                 encrypted_and_encoded_name);
421                 goto out_d_drop;
422         }
423         if (lower_dentry->d_inode)
424                 goto interpose;
425         mount_crypt_stat = &ecryptfs_superblock_to_private(
426                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
427         if (!(mount_crypt_stat
428             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
429                 goto interpose;
430         dput(lower_dentry);
431         rc = ecryptfs_encrypt_and_encode_filename(
432                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
433                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
434                 ecryptfs_dentry->d_name.len);
435         if (rc) {
436                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
437                        "filename; rc = [%d]\n", __func__, rc);
438                 goto out_d_drop;
439         }
440         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
441         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
442                                       lower_dir_dentry,
443                                       encrypted_and_encoded_name_size);
444         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
445         if (IS_ERR(lower_dentry)) {
446                 rc = PTR_ERR(lower_dentry);
447                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
448                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
449                                 encrypted_and_encoded_name);
450                 goto out_d_drop;
451         }
452 interpose:
453         rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
454                                        ecryptfs_dir_inode);
455         goto out;
456 out_d_drop:
457         d_drop(ecryptfs_dentry);
458 out:
459         kfree(encrypted_and_encoded_name);
460         return ERR_PTR(rc);
461 }
462
463 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
464                          struct dentry *new_dentry)
465 {
466         struct dentry *lower_old_dentry;
467         struct dentry *lower_new_dentry;
468         struct dentry *lower_dir_dentry;
469         u64 file_size_save;
470         int rc;
471
472         file_size_save = i_size_read(old_dentry->d_inode);
473         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
474         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
475         dget(lower_old_dentry);
476         dget(lower_new_dentry);
477         lower_dir_dentry = lock_parent(lower_new_dentry);
478         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
479                       lower_new_dentry);
480         if (rc || !lower_new_dentry->d_inode)
481                 goto out_lock;
482         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
483         if (rc)
484                 goto out_lock;
485         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
486         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
487         old_dentry->d_inode->i_nlink =
488                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
489         i_size_write(new_dentry->d_inode, file_size_save);
490 out_lock:
491         unlock_dir(lower_dir_dentry);
492         dput(lower_new_dentry);
493         dput(lower_old_dentry);
494         return rc;
495 }
496
497 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
498 {
499         int rc = 0;
500         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
501         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
502         struct dentry *lower_dir_dentry;
503
504         dget(lower_dentry);
505         lower_dir_dentry = lock_parent(lower_dentry);
506         rc = vfs_unlink(lower_dir_inode, lower_dentry);
507         if (rc) {
508                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
509                 goto out_unlock;
510         }
511         fsstack_copy_attr_times(dir, lower_dir_inode);
512         dentry->d_inode->i_nlink =
513                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
514         dentry->d_inode->i_ctime = dir->i_ctime;
515         d_drop(dentry);
516 out_unlock:
517         unlock_dir(lower_dir_dentry);
518         dput(lower_dentry);
519         return rc;
520 }
521
522 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
523                             const char *symname)
524 {
525         int rc;
526         struct dentry *lower_dentry;
527         struct dentry *lower_dir_dentry;
528         char *encoded_symname;
529         size_t encoded_symlen;
530         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
531
532         lower_dentry = ecryptfs_dentry_to_lower(dentry);
533         dget(lower_dentry);
534         lower_dir_dentry = lock_parent(lower_dentry);
535         mount_crypt_stat = &ecryptfs_superblock_to_private(
536                 dir->i_sb)->mount_crypt_stat;
537         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
538                                                   &encoded_symlen,
539                                                   NULL,
540                                                   mount_crypt_stat, symname,
541                                                   strlen(symname));
542         if (rc)
543                 goto out_lock;
544         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
545                          encoded_symname);
546         kfree(encoded_symname);
547         if (rc || !lower_dentry->d_inode)
548                 goto out_lock;
549         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
550         if (rc)
551                 goto out_lock;
552         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
553         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
554 out_lock:
555         unlock_dir(lower_dir_dentry);
556         dput(lower_dentry);
557         if (!dentry->d_inode)
558                 d_drop(dentry);
559         return rc;
560 }
561
562 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
563 {
564         int rc;
565         struct dentry *lower_dentry;
566         struct dentry *lower_dir_dentry;
567
568         lower_dentry = ecryptfs_dentry_to_lower(dentry);
569         lower_dir_dentry = lock_parent(lower_dentry);
570         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
571         if (rc || !lower_dentry->d_inode)
572                 goto out;
573         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
574         if (rc)
575                 goto out;
576         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
577         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
578         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
579 out:
580         unlock_dir(lower_dir_dentry);
581         if (!dentry->d_inode)
582                 d_drop(dentry);
583         return rc;
584 }
585
586 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
587 {
588         struct dentry *lower_dentry;
589         struct dentry *lower_dir_dentry;
590         int rc;
591
592         lower_dentry = ecryptfs_dentry_to_lower(dentry);
593         dget(dentry);
594         lower_dir_dentry = lock_parent(lower_dentry);
595         dget(lower_dentry);
596         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
597         dput(lower_dentry);
598         if (!rc && dentry->d_inode)
599                 clear_nlink(dentry->d_inode);
600         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
601         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
602         unlock_dir(lower_dir_dentry);
603         if (!rc)
604                 d_drop(dentry);
605         dput(dentry);
606         return rc;
607 }
608
609 static int
610 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
611 {
612         int rc;
613         struct dentry *lower_dentry;
614         struct dentry *lower_dir_dentry;
615
616         lower_dentry = ecryptfs_dentry_to_lower(dentry);
617         lower_dir_dentry = lock_parent(lower_dentry);
618         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
619         if (rc || !lower_dentry->d_inode)
620                 goto out;
621         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
622         if (rc)
623                 goto out;
624         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
625         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
626 out:
627         unlock_dir(lower_dir_dentry);
628         if (!dentry->d_inode)
629                 d_drop(dentry);
630         return rc;
631 }
632
633 static int
634 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
635                 struct inode *new_dir, struct dentry *new_dentry)
636 {
637         int rc;
638         struct dentry *lower_old_dentry;
639         struct dentry *lower_new_dentry;
640         struct dentry *lower_old_dir_dentry;
641         struct dentry *lower_new_dir_dentry;
642         struct dentry *trap = NULL;
643
644         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
645         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
646         dget(lower_old_dentry);
647         dget(lower_new_dentry);
648         lower_old_dir_dentry = dget_parent(lower_old_dentry);
649         lower_new_dir_dentry = dget_parent(lower_new_dentry);
650         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
651         /* source should not be ancestor of target */
652         if (trap == lower_old_dentry) {
653                 rc = -EINVAL;
654                 goto out_lock;
655         }
656         /* target should not be ancestor of source */
657         if (trap == lower_new_dentry) {
658                 rc = -ENOTEMPTY;
659                 goto out_lock;
660         }
661         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
662                         lower_new_dir_dentry->d_inode, lower_new_dentry);
663         if (rc)
664                 goto out_lock;
665         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
666         if (new_dir != old_dir)
667                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
668 out_lock:
669         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
670         dput(lower_new_dir_dentry);
671         dput(lower_old_dir_dentry);
672         dput(lower_new_dentry);
673         dput(lower_old_dentry);
674         return rc;
675 }
676
677 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
678                                    size_t *bufsiz)
679 {
680         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
681         char *lower_buf;
682         size_t lower_bufsiz = PATH_MAX;
683         mm_segment_t old_fs;
684         int rc;
685
686         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
687         if (!lower_buf) {
688                 rc = -ENOMEM;
689                 goto out;
690         }
691         old_fs = get_fs();
692         set_fs(get_ds());
693         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
694                                                    (char __user *)lower_buf,
695                                                    lower_bufsiz);
696         set_fs(old_fs);
697         if (rc < 0)
698                 goto out;
699         lower_bufsiz = rc;
700         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
701                                                   lower_buf, lower_bufsiz);
702 out:
703         kfree(lower_buf);
704         return rc;
705 }
706
707 static int
708 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
709 {
710         char *kbuf;
711         size_t kbufsiz, copied;
712         int rc;
713
714         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
715         if (rc)
716                 goto out;
717         copied = min_t(size_t, bufsiz, kbufsiz);
718         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
719         kfree(kbuf);
720         fsstack_copy_attr_atime(dentry->d_inode,
721                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
722 out:
723         return rc;
724 }
725
726 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
727 {
728         char *buf;
729         int len = PAGE_SIZE, rc;
730         mm_segment_t old_fs;
731
732         /* Released in ecryptfs_put_link(); only release here on error */
733         buf = kmalloc(len, GFP_KERNEL);
734         if (!buf) {
735                 buf = ERR_PTR(-ENOMEM);
736                 goto out;
737         }
738         old_fs = get_fs();
739         set_fs(get_ds());
740         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
741         set_fs(old_fs);
742         if (rc < 0) {
743                 kfree(buf);
744                 buf = ERR_PTR(rc);
745         } else
746                 buf[rc] = '\0';
747 out:
748         nd_set_link(nd, buf);
749         return NULL;
750 }
751
752 static void
753 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
754 {
755         char *buf = nd_get_link(nd);
756         if (!IS_ERR(buf)) {
757                 /* Free the char* */
758                 kfree(buf);
759         }
760 }
761
762 /**
763  * upper_size_to_lower_size
764  * @crypt_stat: Crypt_stat associated with file
765  * @upper_size: Size of the upper file
766  *
767  * Calculate the required size of the lower file based on the
768  * specified size of the upper file. This calculation is based on the
769  * number of headers in the underlying file and the extent size.
770  *
771  * Returns Calculated size of the lower file.
772  */
773 static loff_t
774 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
775                          loff_t upper_size)
776 {
777         loff_t lower_size;
778
779         lower_size = ecryptfs_lower_header_size(crypt_stat);
780         if (upper_size != 0) {
781                 loff_t num_extents;
782
783                 num_extents = upper_size >> crypt_stat->extent_shift;
784                 if (upper_size & ~crypt_stat->extent_mask)
785                         num_extents++;
786                 lower_size += (num_extents * crypt_stat->extent_size);
787         }
788         return lower_size;
789 }
790
791 /**
792  * truncate_upper
793  * @dentry: The ecryptfs layer dentry
794  * @ia: Address of the ecryptfs inode's attributes
795  * @lower_ia: Address of the lower inode's attributes
796  *
797  * Function to handle truncations modifying the size of the file. Note
798  * that the file sizes are interpolated. When expanding, we are simply
799  * writing strings of 0's out. When truncating, we truncate the upper
800  * inode and update the lower_ia according to the page index
801  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
802  * the caller must use lower_ia in a call to notify_change() to perform
803  * the truncation of the lower inode.
804  *
805  * Returns zero on success; non-zero otherwise
806  */
807 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
808                           struct iattr *lower_ia)
809 {
810         int rc = 0;
811         struct inode *inode = dentry->d_inode;
812         struct ecryptfs_crypt_stat *crypt_stat;
813         loff_t i_size = i_size_read(inode);
814         loff_t lower_size_before_truncate;
815         loff_t lower_size_after_truncate;
816
817         if (unlikely((ia->ia_size == i_size))) {
818                 lower_ia->ia_valid &= ~ATTR_SIZE;
819                 return 0;
820         }
821         rc = ecryptfs_get_lower_file(dentry, inode);
822         if (rc)
823                 return rc;
824         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
825         /* Switch on growing or shrinking file */
826         if (ia->ia_size > i_size) {
827                 char zero[] = { 0x00 };
828
829                 lower_ia->ia_valid &= ~ATTR_SIZE;
830                 /* Write a single 0 at the last position of the file;
831                  * this triggers code that will fill in 0's throughout
832                  * the intermediate portion of the previous end of the
833                  * file and the new and of the file */
834                 rc = ecryptfs_write(inode, zero,
835                                     (ia->ia_size - 1), 1);
836         } else { /* ia->ia_size < i_size_read(inode) */
837                 /* We're chopping off all the pages down to the page
838                  * in which ia->ia_size is located. Fill in the end of
839                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
840                  * PAGE_CACHE_SIZE with zeros. */
841                 size_t num_zeros = (PAGE_CACHE_SIZE
842                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
843
844                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
845                         truncate_setsize(inode, ia->ia_size);
846                         lower_ia->ia_size = ia->ia_size;
847                         lower_ia->ia_valid |= ATTR_SIZE;
848                         goto out;
849                 }
850                 if (num_zeros) {
851                         char *zeros_virt;
852
853                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
854                         if (!zeros_virt) {
855                                 rc = -ENOMEM;
856                                 goto out;
857                         }
858                         rc = ecryptfs_write(inode, zeros_virt,
859                                             ia->ia_size, num_zeros);
860                         kfree(zeros_virt);
861                         if (rc) {
862                                 printk(KERN_ERR "Error attempting to zero out "
863                                        "the remainder of the end page on "
864                                        "reducing truncate; rc = [%d]\n", rc);
865                                 goto out;
866                         }
867                 }
868                 truncate_setsize(inode, ia->ia_size);
869                 rc = ecryptfs_write_inode_size_to_metadata(inode);
870                 if (rc) {
871                         printk(KERN_ERR "Problem with "
872                                "ecryptfs_write_inode_size_to_metadata; "
873                                "rc = [%d]\n", rc);
874                         goto out;
875                 }
876                 /* We are reducing the size of the ecryptfs file, and need to
877                  * know if we need to reduce the size of the lower file. */
878                 lower_size_before_truncate =
879                     upper_size_to_lower_size(crypt_stat, i_size);
880                 lower_size_after_truncate =
881                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
882                 if (lower_size_after_truncate < lower_size_before_truncate) {
883                         lower_ia->ia_size = lower_size_after_truncate;
884                         lower_ia->ia_valid |= ATTR_SIZE;
885                 } else
886                         lower_ia->ia_valid &= ~ATTR_SIZE;
887         }
888 out:
889         ecryptfs_put_lower_file(inode);
890         return rc;
891 }
892
893 static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset)
894 {
895         struct ecryptfs_crypt_stat *crypt_stat;
896         loff_t lower_oldsize, lower_newsize;
897
898         crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
899         lower_oldsize = upper_size_to_lower_size(crypt_stat,
900                                                  i_size_read(inode));
901         lower_newsize = upper_size_to_lower_size(crypt_stat, offset);
902         if (lower_newsize > lower_oldsize) {
903                 /*
904                  * The eCryptfs inode and the new *lower* size are mixed here
905                  * because we may not have the lower i_mutex held and/or it may
906                  * not be appropriate to call inode_newsize_ok() with inodes
907                  * from other filesystems.
908                  */
909                 return inode_newsize_ok(inode, lower_newsize);
910         }
911
912         return 0;
913 }
914
915 /**
916  * ecryptfs_truncate
917  * @dentry: The ecryptfs layer dentry
918  * @new_length: The length to expand the file to
919  *
920  * Simple function that handles the truncation of an eCryptfs inode and
921  * its corresponding lower inode.
922  *
923  * Returns zero on success; non-zero otherwise
924  */
925 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
926 {
927         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
928         struct iattr lower_ia = { .ia_valid = 0 };
929         int rc;
930
931         rc = ecryptfs_inode_newsize_ok(dentry->d_inode, new_length);
932         if (rc)
933                 return rc;
934
935         rc = truncate_upper(dentry, &ia, &lower_ia);
936         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
937                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
938
939                 mutex_lock(&lower_dentry->d_inode->i_mutex);
940                 rc = notify_change(lower_dentry, &lower_ia);
941                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
942         }
943         return rc;
944 }
945
946 static int
947 ecryptfs_permission(struct inode *inode, int mask)
948 {
949         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
950 }
951
952 /**
953  * ecryptfs_setattr
954  * @dentry: dentry handle to the inode to modify
955  * @ia: Structure with flags of what to change and values
956  *
957  * Updates the metadata of an inode. If the update is to the size
958  * i.e. truncation, then ecryptfs_truncate will handle the size modification
959  * of both the ecryptfs inode and the lower inode.
960  *
961  * All other metadata changes will be passed right to the lower filesystem,
962  * and we will just update our inode to look like the lower.
963  */
964 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
965 {
966         int rc = 0;
967         struct dentry *lower_dentry;
968         struct iattr lower_ia;
969         struct inode *inode;
970         struct inode *lower_inode;
971         struct ecryptfs_crypt_stat *crypt_stat;
972
973         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
974         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
975                 ecryptfs_init_crypt_stat(crypt_stat);
976         inode = dentry->d_inode;
977         lower_inode = ecryptfs_inode_to_lower(inode);
978         lower_dentry = ecryptfs_dentry_to_lower(dentry);
979         mutex_lock(&crypt_stat->cs_mutex);
980         if (S_ISDIR(dentry->d_inode->i_mode))
981                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
982         else if (S_ISREG(dentry->d_inode->i_mode)
983                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
984                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
985                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
986
987                 mount_crypt_stat = &ecryptfs_superblock_to_private(
988                         dentry->d_sb)->mount_crypt_stat;
989                 rc = ecryptfs_get_lower_file(dentry, inode);
990                 if (rc) {
991                         mutex_unlock(&crypt_stat->cs_mutex);
992                         goto out;
993                 }
994                 rc = ecryptfs_read_metadata(dentry);
995                 ecryptfs_put_lower_file(inode);
996                 if (rc) {
997                         if (!(mount_crypt_stat->flags
998                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
999                                 rc = -EIO;
1000                                 printk(KERN_WARNING "Either the lower file "
1001                                        "is not in a valid eCryptfs format, "
1002                                        "or the key could not be retrieved. "
1003                                        "Plaintext passthrough mode is not "
1004                                        "enabled; returning -EIO\n");
1005                                 mutex_unlock(&crypt_stat->cs_mutex);
1006                                 goto out;
1007                         }
1008                         rc = 0;
1009                         crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
1010                                                | ECRYPTFS_ENCRYPTED);
1011                 }
1012         }
1013         mutex_unlock(&crypt_stat->cs_mutex);
1014
1015         rc = inode_change_ok(inode, ia);
1016         if (rc)
1017                 goto out;
1018         if (ia->ia_valid & ATTR_SIZE) {
1019                 rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size);
1020                 if (rc)
1021                         goto out;
1022         }
1023
1024         if (S_ISREG(inode->i_mode)) {
1025                 rc = filemap_write_and_wait(inode->i_mapping);
1026                 if (rc)
1027                         goto out;
1028                 fsstack_copy_attr_all(inode, lower_inode);
1029         }
1030         memcpy(&lower_ia, ia, sizeof(lower_ia));
1031         if (ia->ia_valid & ATTR_FILE)
1032                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
1033         if (ia->ia_valid & ATTR_SIZE) {
1034                 rc = truncate_upper(dentry, ia, &lower_ia);
1035                 if (rc < 0)
1036                         goto out;
1037         }
1038
1039         /*
1040          * mode change is for clearing setuid/setgid bits. Allow lower fs
1041          * to interpret this in its own way.
1042          */
1043         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1044                 lower_ia.ia_valid &= ~ATTR_MODE;
1045
1046         mutex_lock(&lower_dentry->d_inode->i_mutex);
1047         rc = notify_change(lower_dentry, &lower_ia);
1048         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1049 out:
1050         fsstack_copy_attr_all(inode, lower_inode);
1051         return rc;
1052 }
1053
1054 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1055                           struct kstat *stat)
1056 {
1057         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1058         int rc = 0;
1059
1060         mount_crypt_stat = &ecryptfs_superblock_to_private(
1061                                                 dentry->d_sb)->mount_crypt_stat;
1062         generic_fillattr(dentry->d_inode, stat);
1063         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1064                 char *target;
1065                 size_t targetsiz;
1066
1067                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1068                 if (!rc) {
1069                         kfree(target);
1070                         stat->size = targetsiz;
1071                 }
1072         }
1073         return rc;
1074 }
1075
1076 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1077                      struct kstat *stat)
1078 {
1079         struct kstat lower_stat;
1080         int rc;
1081
1082         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1083                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1084         if (!rc) {
1085                 fsstack_copy_attr_all(dentry->d_inode,
1086                                       ecryptfs_inode_to_lower(dentry->d_inode));
1087                 generic_fillattr(dentry->d_inode, stat);
1088                 stat->blocks = lower_stat.blocks;
1089         }
1090         return rc;
1091 }
1092
1093 int
1094 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1095                   size_t size, int flags)
1096 {
1097         int rc = 0;
1098         struct dentry *lower_dentry;
1099
1100         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1101         if (!lower_dentry->d_inode->i_op->setxattr) {
1102                 rc = -EOPNOTSUPP;
1103                 goto out;
1104         }
1105
1106         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1107 out:
1108         return rc;
1109 }
1110
1111 ssize_t
1112 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1113                         void *value, size_t size)
1114 {
1115         int rc = 0;
1116
1117         if (!lower_dentry->d_inode->i_op->getxattr) {
1118                 rc = -EOPNOTSUPP;
1119                 goto out;
1120         }
1121         mutex_lock(&lower_dentry->d_inode->i_mutex);
1122         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1123                                                    size);
1124         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1125 out:
1126         return rc;
1127 }
1128
1129 static ssize_t
1130 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1131                   size_t size)
1132 {
1133         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1134                                        value, size);
1135 }
1136
1137 static ssize_t
1138 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1139 {
1140         int rc = 0;
1141         struct dentry *lower_dentry;
1142
1143         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1144         if (!lower_dentry->d_inode->i_op->listxattr) {
1145                 rc = -EOPNOTSUPP;
1146                 goto out;
1147         }
1148         mutex_lock(&lower_dentry->d_inode->i_mutex);
1149         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1150         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1151 out:
1152         return rc;
1153 }
1154
1155 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1156 {
1157         int rc = 0;
1158         struct dentry *lower_dentry;
1159
1160         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1161         if (!lower_dentry->d_inode->i_op->removexattr) {
1162                 rc = -EOPNOTSUPP;
1163                 goto out;
1164         }
1165         mutex_lock(&lower_dentry->d_inode->i_mutex);
1166         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1167         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1168 out:
1169         return rc;
1170 }
1171
1172 const struct inode_operations ecryptfs_symlink_iops = {
1173         .readlink = ecryptfs_readlink,
1174         .follow_link = ecryptfs_follow_link,
1175         .put_link = ecryptfs_put_link,
1176         .permission = ecryptfs_permission,
1177         .setattr = ecryptfs_setattr,
1178         .getattr = ecryptfs_getattr_link,
1179         .setxattr = ecryptfs_setxattr,
1180         .getxattr = ecryptfs_getxattr,
1181         .listxattr = ecryptfs_listxattr,
1182         .removexattr = ecryptfs_removexattr
1183 };
1184
1185 const struct inode_operations ecryptfs_dir_iops = {
1186         .create = ecryptfs_create,
1187         .lookup = ecryptfs_lookup,
1188         .link = ecryptfs_link,
1189         .unlink = ecryptfs_unlink,
1190         .symlink = ecryptfs_symlink,
1191         .mkdir = ecryptfs_mkdir,
1192         .rmdir = ecryptfs_rmdir,
1193         .mknod = ecryptfs_mknod,
1194         .rename = ecryptfs_rename,
1195         .permission = ecryptfs_permission,
1196         .setattr = ecryptfs_setattr,
1197         .setxattr = ecryptfs_setxattr,
1198         .getxattr = ecryptfs_getxattr,
1199         .listxattr = ecryptfs_listxattr,
1200         .removexattr = ecryptfs_removexattr
1201 };
1202
1203 const struct inode_operations ecryptfs_main_iops = {
1204         .permission = ecryptfs_permission,
1205         .setattr = ecryptfs_setattr,
1206         .getattr = ecryptfs_getattr,
1207         .setxattr = ecryptfs_setxattr,
1208         .getxattr = ecryptfs_getxattr,
1209         .listxattr = ecryptfs_listxattr,
1210         .removexattr = ecryptfs_removexattr
1211 };