eCryptfs: Rename ecryptfs_crypt_stat.num_header_bytes_at_front
[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 <asm/unaligned.h>
35 #include "ecryptfs_kernel.h"
36
37 static struct dentry *lock_parent(struct dentry *dentry)
38 {
39         struct dentry *dir;
40
41         dir = dget_parent(dentry);
42         mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
43         return dir;
44 }
45
46 static void unlock_dir(struct dentry *dir)
47 {
48         mutex_unlock(&dir->d_inode->i_mutex);
49         dput(dir);
50 }
51
52 /**
53  * ecryptfs_create_underlying_file
54  * @lower_dir_inode: inode of the parent in the lower fs of the new file
55  * @dentry: New file's dentry
56  * @mode: The mode of the new file
57  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
58  *
59  * Creates the file in the lower file system.
60  *
61  * Returns zero on success; non-zero on error condition
62  */
63 static int
64 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
65                                 struct dentry *dentry, int mode,
66                                 struct nameidata *nd)
67 {
68         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
69         struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
70         struct dentry *dentry_save;
71         struct vfsmount *vfsmount_save;
72         int rc;
73
74         dentry_save = nd->path.dentry;
75         vfsmount_save = nd->path.mnt;
76         nd->path.dentry = lower_dentry;
77         nd->path.mnt = lower_mnt;
78         rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
79         nd->path.dentry = dentry_save;
80         nd->path.mnt = vfsmount_save;
81         return rc;
82 }
83
84 /**
85  * ecryptfs_do_create
86  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
87  * @ecryptfs_dentry: New file's dentry in ecryptfs
88  * @mode: The mode of the new file
89  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
90  *
91  * Creates the underlying file and the eCryptfs inode which will link to
92  * it. It will also update the eCryptfs directory inode to mimic the
93  * stat of the lower directory inode.
94  *
95  * Returns zero on success; non-zero on error condition
96  */
97 static int
98 ecryptfs_do_create(struct inode *directory_inode,
99                    struct dentry *ecryptfs_dentry, int mode,
100                    struct nameidata *nd)
101 {
102         int rc;
103         struct dentry *lower_dentry;
104         struct dentry *lower_dir_dentry;
105
106         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
107         lower_dir_dentry = lock_parent(lower_dentry);
108         if (IS_ERR(lower_dir_dentry)) {
109                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
110                                 "dentry\n");
111                 rc = PTR_ERR(lower_dir_dentry);
112                 goto out;
113         }
114         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
115                                              ecryptfs_dentry, mode, nd);
116         if (rc) {
117                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
118                        "rc = [%d]\n", __func__, rc);
119                 goto out_lock;
120         }
121         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
122                                 directory_inode->i_sb, 0);
123         if (rc) {
124                 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
125                 goto out_lock;
126         }
127         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
128         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
129 out_lock:
130         unlock_dir(lower_dir_dentry);
131 out:
132         return rc;
133 }
134
135 /**
136  * grow_file
137  * @ecryptfs_dentry: the eCryptfs dentry
138  *
139  * This is the code which will grow the file to its correct size.
140  */
141 static int grow_file(struct dentry *ecryptfs_dentry)
142 {
143         struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode;
144         struct file fake_file;
145         struct ecryptfs_file_info tmp_file_info;
146         char zero_virt[] = { 0x00 };
147         int rc = 0;
148
149         memset(&fake_file, 0, sizeof(fake_file));
150         fake_file.f_path.dentry = ecryptfs_dentry;
151         memset(&tmp_file_info, 0, sizeof(tmp_file_info));
152         ecryptfs_set_file_private(&fake_file, &tmp_file_info);
153         ecryptfs_set_file_lower(
154                 &fake_file,
155                 ecryptfs_inode_to_private(ecryptfs_inode)->lower_file);
156         rc = ecryptfs_write(&fake_file, zero_virt, 0, 1);
157         i_size_write(ecryptfs_inode, 0);
158         rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
159         ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |=
160                 ECRYPTFS_NEW_FILE;
161         return rc;
162 }
163
164 /**
165  * ecryptfs_initialize_file
166  *
167  * Cause the file to be changed from a basic empty file to an ecryptfs
168  * file with a header and first data page.
169  *
170  * Returns zero on success
171  */
172 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
173 {
174         struct ecryptfs_crypt_stat *crypt_stat =
175                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
176         int rc = 0;
177
178         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
179                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
180                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
181                 goto out;
182         }
183         crypt_stat->flags |= ECRYPTFS_NEW_FILE;
184         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
185         rc = ecryptfs_new_file_context(ecryptfs_dentry);
186         if (rc) {
187                 ecryptfs_printk(KERN_ERR, "Error creating new file "
188                                 "context; rc = [%d]\n", rc);
189                 goto out;
190         }
191         if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
192                 rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
193                 if (rc) {
194                         printk(KERN_ERR "%s: Error attempting to initialize "
195                                "the persistent file for the dentry with name "
196                                "[%s]; rc = [%d]\n", __func__,
197                                ecryptfs_dentry->d_name.name, rc);
198                         goto out;
199                 }
200         }
201         rc = ecryptfs_write_metadata(ecryptfs_dentry);
202         if (rc) {
203                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
204                 goto out;
205         }
206         rc = grow_file(ecryptfs_dentry);
207         if (rc)
208                 printk(KERN_ERR "Error growing file; rc = [%d]\n", rc);
209 out:
210         return rc;
211 }
212
213 /**
214  * ecryptfs_create
215  * @dir: The inode of the directory in which to create the file.
216  * @dentry: The eCryptfs dentry
217  * @mode: The mode of the new file.
218  * @nd: nameidata
219  *
220  * Creates a new file.
221  *
222  * Returns zero on success; non-zero on error condition
223  */
224 static int
225 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
226                 int mode, struct nameidata *nd)
227 {
228         int rc;
229
230         /* ecryptfs_do_create() calls ecryptfs_interpose() */
231         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
232         if (unlikely(rc)) {
233                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
234                                 "lower filesystem\n");
235                 goto out;
236         }
237         /* At this point, a file exists on "disk"; we need to make sure
238          * that this on disk file is prepared to be an ecryptfs file */
239         rc = ecryptfs_initialize_file(ecryptfs_dentry);
240 out:
241         return rc;
242 }
243
244 /**
245  * ecryptfs_lookup_and_interpose_lower - Perform a lookup
246  */
247 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
248                                         struct dentry *lower_dentry,
249                                         struct inode *ecryptfs_dir_inode,
250                                         struct nameidata *ecryptfs_nd)
251 {
252         struct dentry *lower_dir_dentry;
253         struct vfsmount *lower_mnt;
254         struct inode *lower_inode;
255         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
256         struct ecryptfs_crypt_stat *crypt_stat;
257         char *page_virt = NULL;
258         u64 file_size;
259         int rc = 0;
260
261         lower_dir_dentry = lower_dentry->d_parent;
262         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
263                                    ecryptfs_dentry->d_parent));
264         lower_inode = lower_dentry->d_inode;
265         fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
266         BUG_ON(!atomic_read(&lower_dentry->d_count));
267         ecryptfs_set_dentry_private(ecryptfs_dentry,
268                                     kmem_cache_alloc(ecryptfs_dentry_info_cache,
269                                                      GFP_KERNEL));
270         if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
271                 rc = -ENOMEM;
272                 printk(KERN_ERR "%s: Out of memory whilst attempting "
273                        "to allocate ecryptfs_dentry_info struct\n",
274                         __func__);
275                 goto out_dput;
276         }
277         ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
278         ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
279         if (!lower_dentry->d_inode) {
280                 /* We want to add because we couldn't find in lower */
281                 d_add(ecryptfs_dentry, NULL);
282                 goto out;
283         }
284         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
285                                 ecryptfs_dir_inode->i_sb,
286                                 ECRYPTFS_INTERPOSE_FLAG_D_ADD);
287         if (rc) {
288                 printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
289                        __func__, rc);
290                 goto out;
291         }
292         if (S_ISDIR(lower_inode->i_mode))
293                 goto out;
294         if (S_ISLNK(lower_inode->i_mode))
295                 goto out;
296         if (special_file(lower_inode->i_mode))
297                 goto out;
298         if (!ecryptfs_nd)
299                 goto out;
300         /* Released in this function */
301         page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
302         if (!page_virt) {
303                 printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
304                        __func__);
305                 rc = -ENOMEM;
306                 goto out;
307         }
308         if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
309                 rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
310                 if (rc) {
311                         printk(KERN_ERR "%s: Error attempting to initialize "
312                                "the persistent file for the dentry with name "
313                                "[%s]; rc = [%d]\n", __func__,
314                                ecryptfs_dentry->d_name.name, rc);
315                         goto out_free_kmem;
316                 }
317         }
318         crypt_stat = &ecryptfs_inode_to_private(
319                                         ecryptfs_dentry->d_inode)->crypt_stat;
320         /* TODO: lock for crypt_stat comparison */
321         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
322                         ecryptfs_set_default_sizes(crypt_stat);
323         rc = ecryptfs_read_and_validate_header_region(page_virt,
324                                                       ecryptfs_dentry->d_inode);
325         if (rc) {
326                 rc = ecryptfs_read_and_validate_xattr_region(page_virt,
327                                                              ecryptfs_dentry);
328                 if (rc) {
329                         rc = 0;
330                         goto out_free_kmem;
331                 }
332                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
333         }
334         mount_crypt_stat = &ecryptfs_superblock_to_private(
335                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
336         if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
337                 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
338                         file_size = (crypt_stat->metadata_size
339                                      + i_size_read(lower_dentry->d_inode));
340                 else
341                         file_size = i_size_read(lower_dentry->d_inode);
342         } else {
343                 file_size = get_unaligned_be64(page_virt);
344         }
345         i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size);
346 out_free_kmem:
347         kmem_cache_free(ecryptfs_header_cache_2, page_virt);
348         goto out;
349 out_dput:
350         dput(lower_dentry);
351         d_drop(ecryptfs_dentry);
352 out:
353         return rc;
354 }
355
356 /**
357  * ecryptfs_lookup
358  * @ecryptfs_dir_inode: The eCryptfs directory inode
359  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
360  * @ecryptfs_nd: nameidata; may be NULL
361  *
362  * Find a file on disk. If the file does not exist, then we'll add it to the
363  * dentry cache and continue on to read it from the disk.
364  */
365 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
366                                       struct dentry *ecryptfs_dentry,
367                                       struct nameidata *ecryptfs_nd)
368 {
369         char *encrypted_and_encoded_name = NULL;
370         size_t encrypted_and_encoded_name_size;
371         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
372         struct dentry *lower_dir_dentry, *lower_dentry;
373         int rc = 0;
374
375         ecryptfs_dentry->d_op = &ecryptfs_dops;
376         if ((ecryptfs_dentry->d_name.len == 1
377              && !strcmp(ecryptfs_dentry->d_name.name, "."))
378             || (ecryptfs_dentry->d_name.len == 2
379                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
380                 goto out_d_drop;
381         }
382         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
383         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
384         lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
385                                       lower_dir_dentry,
386                                       ecryptfs_dentry->d_name.len);
387         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
388         if (IS_ERR(lower_dentry)) {
389                 rc = PTR_ERR(lower_dentry);
390                 printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
391                        "lower_dentry = [%s]\n", __func__, rc,
392                        ecryptfs_dentry->d_name.name);
393                 goto out_d_drop;
394         }
395         if (lower_dentry->d_inode)
396                 goto lookup_and_interpose;
397         mount_crypt_stat = &ecryptfs_superblock_to_private(
398                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
399         if (!(mount_crypt_stat
400             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
401                 goto lookup_and_interpose;
402         dput(lower_dentry);
403         rc = ecryptfs_encrypt_and_encode_filename(
404                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
405                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
406                 ecryptfs_dentry->d_name.len);
407         if (rc) {
408                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
409                        "filename; rc = [%d]\n", __func__, rc);
410                 goto out_d_drop;
411         }
412         mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
413         lower_dentry = lookup_one_len(encrypted_and_encoded_name,
414                                       lower_dir_dentry,
415                                       encrypted_and_encoded_name_size - 1);
416         mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
417         if (IS_ERR(lower_dentry)) {
418                 rc = PTR_ERR(lower_dentry);
419                 printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
420                        "lower_dentry = [%s]\n", __func__, rc,
421                        encrypted_and_encoded_name);
422                 goto out_d_drop;
423         }
424 lookup_and_interpose:
425         rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
426                                                  ecryptfs_dir_inode,
427                                                  ecryptfs_nd);
428         goto out;
429 out_d_drop:
430         d_drop(ecryptfs_dentry);
431 out:
432         kfree(encrypted_and_encoded_name);
433         return ERR_PTR(rc);
434 }
435
436 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
437                          struct dentry *new_dentry)
438 {
439         struct dentry *lower_old_dentry;
440         struct dentry *lower_new_dentry;
441         struct dentry *lower_dir_dentry;
442         u64 file_size_save;
443         int rc;
444
445         file_size_save = i_size_read(old_dentry->d_inode);
446         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
447         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
448         dget(lower_old_dentry);
449         dget(lower_new_dentry);
450         lower_dir_dentry = lock_parent(lower_new_dentry);
451         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
452                       lower_new_dentry);
453         if (rc || !lower_new_dentry->d_inode)
454                 goto out_lock;
455         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
456         if (rc)
457                 goto out_lock;
458         fsstack_copy_attr_times(dir, lower_new_dentry->d_inode);
459         fsstack_copy_inode_size(dir, lower_new_dentry->d_inode);
460         old_dentry->d_inode->i_nlink =
461                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
462         i_size_write(new_dentry->d_inode, file_size_save);
463 out_lock:
464         unlock_dir(lower_dir_dentry);
465         dput(lower_new_dentry);
466         dput(lower_old_dentry);
467         return rc;
468 }
469
470 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
471 {
472         int rc = 0;
473         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
474         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
475         struct dentry *lower_dir_dentry;
476
477         dget(lower_dentry);
478         lower_dir_dentry = lock_parent(lower_dentry);
479         rc = vfs_unlink(lower_dir_inode, lower_dentry);
480         if (rc) {
481                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
482                 goto out_unlock;
483         }
484         fsstack_copy_attr_times(dir, lower_dir_inode);
485         dentry->d_inode->i_nlink =
486                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
487         dentry->d_inode->i_ctime = dir->i_ctime;
488         d_drop(dentry);
489 out_unlock:
490         unlock_dir(lower_dir_dentry);
491         dput(lower_dentry);
492         return rc;
493 }
494
495 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
496                             const char *symname)
497 {
498         int rc;
499         struct dentry *lower_dentry;
500         struct dentry *lower_dir_dentry;
501         char *encoded_symname;
502         size_t encoded_symlen;
503         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
504
505         lower_dentry = ecryptfs_dentry_to_lower(dentry);
506         dget(lower_dentry);
507         lower_dir_dentry = lock_parent(lower_dentry);
508         mount_crypt_stat = &ecryptfs_superblock_to_private(
509                 dir->i_sb)->mount_crypt_stat;
510         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
511                                                   &encoded_symlen,
512                                                   NULL,
513                                                   mount_crypt_stat, symname,
514                                                   strlen(symname));
515         if (rc)
516                 goto out_lock;
517         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
518                          encoded_symname);
519         kfree(encoded_symname);
520         if (rc || !lower_dentry->d_inode)
521                 goto out_lock;
522         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
523         if (rc)
524                 goto out_lock;
525         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
526         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
527 out_lock:
528         unlock_dir(lower_dir_dentry);
529         dput(lower_dentry);
530         if (!dentry->d_inode)
531                 d_drop(dentry);
532         return rc;
533 }
534
535 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
536 {
537         int rc;
538         struct dentry *lower_dentry;
539         struct dentry *lower_dir_dentry;
540
541         lower_dentry = ecryptfs_dentry_to_lower(dentry);
542         lower_dir_dentry = lock_parent(lower_dentry);
543         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
544         if (rc || !lower_dentry->d_inode)
545                 goto out;
546         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
547         if (rc)
548                 goto out;
549         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
550         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
551         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
552 out:
553         unlock_dir(lower_dir_dentry);
554         if (!dentry->d_inode)
555                 d_drop(dentry);
556         return rc;
557 }
558
559 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
560 {
561         struct dentry *lower_dentry;
562         struct dentry *lower_dir_dentry;
563         int rc;
564
565         lower_dentry = ecryptfs_dentry_to_lower(dentry);
566         dget(dentry);
567         lower_dir_dentry = lock_parent(lower_dentry);
568         dget(lower_dentry);
569         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
570         dput(lower_dentry);
571         if (!rc)
572                 d_delete(lower_dentry);
573         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
574         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
575         unlock_dir(lower_dir_dentry);
576         if (!rc)
577                 d_drop(dentry);
578         dput(dentry);
579         return rc;
580 }
581
582 static int
583 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
584 {
585         int rc;
586         struct dentry *lower_dentry;
587         struct dentry *lower_dir_dentry;
588
589         lower_dentry = ecryptfs_dentry_to_lower(dentry);
590         lower_dir_dentry = lock_parent(lower_dentry);
591         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
592         if (rc || !lower_dentry->d_inode)
593                 goto out;
594         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
595         if (rc)
596                 goto out;
597         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
598         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
599 out:
600         unlock_dir(lower_dir_dentry);
601         if (!dentry->d_inode)
602                 d_drop(dentry);
603         return rc;
604 }
605
606 static int
607 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
608                 struct inode *new_dir, struct dentry *new_dentry)
609 {
610         int rc;
611         struct dentry *lower_old_dentry;
612         struct dentry *lower_new_dentry;
613         struct dentry *lower_old_dir_dentry;
614         struct dentry *lower_new_dir_dentry;
615         struct dentry *trap = NULL;
616
617         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
618         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
619         dget(lower_old_dentry);
620         dget(lower_new_dentry);
621         lower_old_dir_dentry = dget_parent(lower_old_dentry);
622         lower_new_dir_dentry = dget_parent(lower_new_dentry);
623         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
624         /* source should not be ancestor of target */
625         if (trap == lower_old_dentry) {
626                 rc = -EINVAL;
627                 goto out_lock;
628         }
629         /* target should not be ancestor of source */
630         if (trap == lower_new_dentry) {
631                 rc = -ENOTEMPTY;
632                 goto out_lock;
633         }
634         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
635                         lower_new_dir_dentry->d_inode, lower_new_dentry);
636         if (rc)
637                 goto out_lock;
638         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
639         if (new_dir != old_dir)
640                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
641 out_lock:
642         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
643         dput(lower_new_dentry->d_parent);
644         dput(lower_old_dentry->d_parent);
645         dput(lower_new_dentry);
646         dput(lower_old_dentry);
647         return rc;
648 }
649
650 static int
651 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
652 {
653         char *lower_buf;
654         size_t lower_bufsiz;
655         struct dentry *lower_dentry;
656         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
657         char *plaintext_name;
658         size_t plaintext_name_size;
659         mm_segment_t old_fs;
660         int rc;
661
662         lower_dentry = ecryptfs_dentry_to_lower(dentry);
663         if (!lower_dentry->d_inode->i_op->readlink) {
664                 rc = -EINVAL;
665                 goto out;
666         }
667         mount_crypt_stat = &ecryptfs_superblock_to_private(
668                                                 dentry->d_sb)->mount_crypt_stat;
669         /*
670          * If the lower filename is encrypted, it will result in a significantly
671          * longer name.  If needed, truncate the name after decode and decrypt.
672          */
673         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
674                 lower_bufsiz = PATH_MAX;
675         else
676                 lower_bufsiz = bufsiz;
677         /* Released in this function */
678         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
679         if (lower_buf == NULL) {
680                 printk(KERN_ERR "%s: Out of memory whilst attempting to "
681                        "kmalloc [%zd] bytes\n", __func__, lower_bufsiz);
682                 rc = -ENOMEM;
683                 goto out;
684         }
685         old_fs = get_fs();
686         set_fs(get_ds());
687         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
688                                                    (char __user *)lower_buf,
689                                                    lower_bufsiz);
690         set_fs(old_fs);
691         if (rc >= 0) {
692                 rc = ecryptfs_decode_and_decrypt_filename(&plaintext_name,
693                                                           &plaintext_name_size,
694                                                           dentry, lower_buf,
695                                                           rc);
696                 if (rc) {
697                         printk(KERN_ERR "%s: Error attempting to decode and "
698                                "decrypt filename; rc = [%d]\n", __func__,
699                                 rc);
700                         goto out_free_lower_buf;
701                 }
702                 /* Check for bufsiz <= 0 done in sys_readlinkat() */
703                 rc = copy_to_user(buf, plaintext_name,
704                                   min((size_t) bufsiz, plaintext_name_size));
705                 if (rc)
706                         rc = -EFAULT;
707                 else
708                         rc = plaintext_name_size;
709                 kfree(plaintext_name);
710                 fsstack_copy_attr_atime(dentry->d_inode, lower_dentry->d_inode);
711         }
712 out_free_lower_buf:
713         kfree(lower_buf);
714 out:
715         return rc;
716 }
717
718 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
719 {
720         char *buf;
721         int len = PAGE_SIZE, rc;
722         mm_segment_t old_fs;
723
724         /* Released in ecryptfs_put_link(); only release here on error */
725         buf = kmalloc(len, GFP_KERNEL);
726         if (!buf) {
727                 buf = ERR_PTR(-ENOMEM);
728                 goto out;
729         }
730         old_fs = get_fs();
731         set_fs(get_ds());
732         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
733         set_fs(old_fs);
734         if (rc < 0) {
735                 kfree(buf);
736                 buf = ERR_PTR(rc);
737         } else
738                 buf[rc] = '\0';
739 out:
740         nd_set_link(nd, buf);
741         return NULL;
742 }
743
744 static void
745 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
746 {
747         char *buf = nd_get_link(nd);
748         if (!IS_ERR(buf)) {
749                 /* Free the char* */
750                 kfree(buf);
751         }
752 }
753
754 /**
755  * upper_size_to_lower_size
756  * @crypt_stat: Crypt_stat associated with file
757  * @upper_size: Size of the upper file
758  *
759  * Calculate the required size of the lower file based on the
760  * specified size of the upper file. This calculation is based on the
761  * number of headers in the underlying file and the extent size.
762  *
763  * Returns Calculated size of the lower file.
764  */
765 static loff_t
766 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
767                          loff_t upper_size)
768 {
769         loff_t lower_size;
770
771         lower_size = ecryptfs_lower_header_size(crypt_stat);
772         if (upper_size != 0) {
773                 loff_t num_extents;
774
775                 num_extents = upper_size >> crypt_stat->extent_shift;
776                 if (upper_size & ~crypt_stat->extent_mask)
777                         num_extents++;
778                 lower_size += (num_extents * crypt_stat->extent_size);
779         }
780         return lower_size;
781 }
782
783 /**
784  * truncate_upper
785  * @dentry: The ecryptfs layer dentry
786  * @ia: Address of the ecryptfs inode's attributes
787  * @lower_ia: Address of the lower inode's attributes
788  *
789  * Function to handle truncations modifying the size of the file. Note
790  * that the file sizes are interpolated. When expanding, we are simply
791  * writing strings of 0's out. When truncating, we truncate the upper
792  * inode and update the lower_ia according to the page index
793  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
794  * the caller must use lower_ia in a call to notify_change() to perform
795  * the truncation of the lower inode.
796  *
797  * Returns zero on success; non-zero otherwise
798  */
799 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
800                           struct iattr *lower_ia)
801 {
802         int rc = 0;
803         struct inode *inode = dentry->d_inode;
804         struct dentry *lower_dentry;
805         struct file fake_ecryptfs_file;
806         struct ecryptfs_crypt_stat *crypt_stat;
807         loff_t i_size = i_size_read(inode);
808         loff_t lower_size_before_truncate;
809         loff_t lower_size_after_truncate;
810
811         if (unlikely((ia->ia_size == i_size))) {
812                 lower_ia->ia_valid &= ~ATTR_SIZE;
813                 goto out;
814         }
815         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
816         /* Set up a fake ecryptfs file, this is used to interface with
817          * the file in the underlying filesystem so that the
818          * truncation has an effect there as well. */
819         memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file));
820         fake_ecryptfs_file.f_path.dentry = dentry;
821         /* Released at out_free: label */
822         ecryptfs_set_file_private(&fake_ecryptfs_file,
823                                   kmem_cache_alloc(ecryptfs_file_info_cache,
824                                                    GFP_KERNEL));
825         if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) {
826                 rc = -ENOMEM;
827                 goto out;
828         }
829         lower_dentry = ecryptfs_dentry_to_lower(dentry);
830         ecryptfs_set_file_lower(
831                 &fake_ecryptfs_file,
832                 ecryptfs_inode_to_private(dentry->d_inode)->lower_file);
833         /* Switch on growing or shrinking file */
834         if (ia->ia_size > i_size) {
835                 char zero[] = { 0x00 };
836
837                 lower_ia->ia_valid &= ~ATTR_SIZE;
838                 /* Write a single 0 at the last position of the file;
839                  * this triggers code that will fill in 0's throughout
840                  * the intermediate portion of the previous end of the
841                  * file and the new and of the file */
842                 rc = ecryptfs_write(&fake_ecryptfs_file, zero,
843                                     (ia->ia_size - 1), 1);
844         } else { /* ia->ia_size < i_size_read(inode) */
845                 /* We're chopping off all the pages down to the page
846                  * in which ia->ia_size is located. Fill in the end of
847                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
848                  * PAGE_CACHE_SIZE with zeros. */
849                 size_t num_zeros = (PAGE_CACHE_SIZE
850                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
851
852                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
853                         rc = vmtruncate(inode, ia->ia_size);
854                         if (rc)
855                                 goto out_free;
856                         lower_ia->ia_size = ia->ia_size;
857                         lower_ia->ia_valid |= ATTR_SIZE;
858                         goto out_free;
859                 }
860                 if (num_zeros) {
861                         char *zeros_virt;
862
863                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
864                         if (!zeros_virt) {
865                                 rc = -ENOMEM;
866                                 goto out_free;
867                         }
868                         rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt,
869                                             ia->ia_size, num_zeros);
870                         kfree(zeros_virt);
871                         if (rc) {
872                                 printk(KERN_ERR "Error attempting to zero out "
873                                        "the remainder of the end page on "
874                                        "reducing truncate; rc = [%d]\n", rc);
875                                 goto out_free;
876                         }
877                 }
878                 vmtruncate(inode, ia->ia_size);
879                 rc = ecryptfs_write_inode_size_to_metadata(inode);
880                 if (rc) {
881                         printk(KERN_ERR "Problem with "
882                                "ecryptfs_write_inode_size_to_metadata; "
883                                "rc = [%d]\n", rc);
884                         goto out_free;
885                 }
886                 /* We are reducing the size of the ecryptfs file, and need to
887                  * know if we need to reduce the size of the lower file. */
888                 lower_size_before_truncate =
889                     upper_size_to_lower_size(crypt_stat, i_size);
890                 lower_size_after_truncate =
891                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
892                 if (lower_size_after_truncate < lower_size_before_truncate) {
893                         lower_ia->ia_size = lower_size_after_truncate;
894                         lower_ia->ia_valid |= ATTR_SIZE;
895                 } else
896                         lower_ia->ia_valid &= ~ATTR_SIZE;
897         }
898 out_free:
899         if (ecryptfs_file_to_private(&fake_ecryptfs_file))
900                 kmem_cache_free(ecryptfs_file_info_cache,
901                                 ecryptfs_file_to_private(&fake_ecryptfs_file));
902 out:
903         return rc;
904 }
905
906 /**
907  * ecryptfs_truncate
908  * @dentry: The ecryptfs layer dentry
909  * @new_length: The length to expand the file to
910  *
911  * Simple function that handles the truncation of an eCryptfs inode and
912  * its corresponding lower inode.
913  *
914  * Returns zero on success; non-zero otherwise
915  */
916 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
917 {
918         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
919         struct iattr lower_ia = { .ia_valid = 0 };
920         int rc;
921
922         rc = truncate_upper(dentry, &ia, &lower_ia);
923         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
924                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
925
926                 mutex_lock(&lower_dentry->d_inode->i_mutex);
927                 rc = notify_change(lower_dentry, &lower_ia);
928                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
929         }
930         return rc;
931 }
932
933 static int
934 ecryptfs_permission(struct inode *inode, int mask)
935 {
936         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
937 }
938
939 /**
940  * ecryptfs_setattr
941  * @dentry: dentry handle to the inode to modify
942  * @ia: Structure with flags of what to change and values
943  *
944  * Updates the metadata of an inode. If the update is to the size
945  * i.e. truncation, then ecryptfs_truncate will handle the size modification
946  * of both the ecryptfs inode and the lower inode.
947  *
948  * All other metadata changes will be passed right to the lower filesystem,
949  * and we will just update our inode to look like the lower.
950  */
951 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
952 {
953         int rc = 0;
954         struct dentry *lower_dentry;
955         struct iattr lower_ia;
956         struct inode *inode;
957         struct inode *lower_inode;
958         struct ecryptfs_crypt_stat *crypt_stat;
959
960         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
961         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
962                 ecryptfs_init_crypt_stat(crypt_stat);
963         inode = dentry->d_inode;
964         lower_inode = ecryptfs_inode_to_lower(inode);
965         lower_dentry = ecryptfs_dentry_to_lower(dentry);
966         mutex_lock(&crypt_stat->cs_mutex);
967         if (S_ISDIR(dentry->d_inode->i_mode))
968                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
969         else if (S_ISREG(dentry->d_inode->i_mode)
970                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
971                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
972                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
973
974                 mount_crypt_stat = &ecryptfs_superblock_to_private(
975                         dentry->d_sb)->mount_crypt_stat;
976                 rc = ecryptfs_read_metadata(dentry);
977                 if (rc) {
978                         if (!(mount_crypt_stat->flags
979                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
980                                 rc = -EIO;
981                                 printk(KERN_WARNING "Either the lower file "
982                                        "is not in a valid eCryptfs format, "
983                                        "or the key could not be retrieved. "
984                                        "Plaintext passthrough mode is not "
985                                        "enabled; returning -EIO\n");
986                                 mutex_unlock(&crypt_stat->cs_mutex);
987                                 goto out;
988                         }
989                         rc = 0;
990                         crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
991                 }
992         }
993         mutex_unlock(&crypt_stat->cs_mutex);
994         memcpy(&lower_ia, ia, sizeof(lower_ia));
995         if (ia->ia_valid & ATTR_FILE)
996                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
997         if (ia->ia_valid & ATTR_SIZE) {
998                 rc = truncate_upper(dentry, ia, &lower_ia);
999                 if (rc < 0)
1000                         goto out;
1001         }
1002
1003         /*
1004          * mode change is for clearing setuid/setgid bits. Allow lower fs
1005          * to interpret this in its own way.
1006          */
1007         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1008                 lower_ia.ia_valid &= ~ATTR_MODE;
1009
1010         mutex_lock(&lower_dentry->d_inode->i_mutex);
1011         rc = notify_change(lower_dentry, &lower_ia);
1012         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1013 out:
1014         fsstack_copy_attr_all(inode, lower_inode);
1015         return rc;
1016 }
1017
1018 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1019                      struct kstat *stat)
1020 {
1021         struct kstat lower_stat;
1022         int rc;
1023
1024         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1025                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1026         if (!rc) {
1027                 generic_fillattr(dentry->d_inode, stat);
1028                 stat->blocks = lower_stat.blocks;
1029         }
1030         return rc;
1031 }
1032
1033 int
1034 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1035                   size_t size, int flags)
1036 {
1037         int rc = 0;
1038         struct dentry *lower_dentry;
1039
1040         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1041         if (!lower_dentry->d_inode->i_op->setxattr) {
1042                 rc = -ENOSYS;
1043                 goto out;
1044         }
1045         mutex_lock(&lower_dentry->d_inode->i_mutex);
1046         rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value,
1047                                                    size, flags);
1048         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1049 out:
1050         return rc;
1051 }
1052
1053 ssize_t
1054 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1055                         void *value, size_t size)
1056 {
1057         int rc = 0;
1058
1059         if (!lower_dentry->d_inode->i_op->getxattr) {
1060                 rc = -ENOSYS;
1061                 goto out;
1062         }
1063         mutex_lock(&lower_dentry->d_inode->i_mutex);
1064         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1065                                                    size);
1066         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1067 out:
1068         return rc;
1069 }
1070
1071 static ssize_t
1072 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1073                   size_t size)
1074 {
1075         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1076                                        value, size);
1077 }
1078
1079 static ssize_t
1080 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1081 {
1082         int rc = 0;
1083         struct dentry *lower_dentry;
1084
1085         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1086         if (!lower_dentry->d_inode->i_op->listxattr) {
1087                 rc = -ENOSYS;
1088                 goto out;
1089         }
1090         mutex_lock(&lower_dentry->d_inode->i_mutex);
1091         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1092         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1093 out:
1094         return rc;
1095 }
1096
1097 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1098 {
1099         int rc = 0;
1100         struct dentry *lower_dentry;
1101
1102         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1103         if (!lower_dentry->d_inode->i_op->removexattr) {
1104                 rc = -ENOSYS;
1105                 goto out;
1106         }
1107         mutex_lock(&lower_dentry->d_inode->i_mutex);
1108         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1109         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1110 out:
1111         return rc;
1112 }
1113
1114 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
1115 {
1116         if ((ecryptfs_inode_to_lower(inode)
1117              == (struct inode *)candidate_lower_inode))
1118                 return 1;
1119         else
1120                 return 0;
1121 }
1122
1123 int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
1124 {
1125         ecryptfs_init_inode(inode, (struct inode *)lower_inode);
1126         return 0;
1127 }
1128
1129 const struct inode_operations ecryptfs_symlink_iops = {
1130         .readlink = ecryptfs_readlink,
1131         .follow_link = ecryptfs_follow_link,
1132         .put_link = ecryptfs_put_link,
1133         .permission = ecryptfs_permission,
1134         .setattr = ecryptfs_setattr,
1135         .setxattr = ecryptfs_setxattr,
1136         .getxattr = ecryptfs_getxattr,
1137         .listxattr = ecryptfs_listxattr,
1138         .removexattr = ecryptfs_removexattr
1139 };
1140
1141 const struct inode_operations ecryptfs_dir_iops = {
1142         .create = ecryptfs_create,
1143         .lookup = ecryptfs_lookup,
1144         .link = ecryptfs_link,
1145         .unlink = ecryptfs_unlink,
1146         .symlink = ecryptfs_symlink,
1147         .mkdir = ecryptfs_mkdir,
1148         .rmdir = ecryptfs_rmdir,
1149         .mknod = ecryptfs_mknod,
1150         .rename = ecryptfs_rename,
1151         .permission = ecryptfs_permission,
1152         .setattr = ecryptfs_setattr,
1153         .setxattr = ecryptfs_setxattr,
1154         .getxattr = ecryptfs_getxattr,
1155         .listxattr = ecryptfs_listxattr,
1156         .removexattr = ecryptfs_removexattr
1157 };
1158
1159 const struct inode_operations ecryptfs_main_iops = {
1160         .permission = ecryptfs_permission,
1161         .setattr = ecryptfs_setattr,
1162         .getattr = ecryptfs_getattr,
1163         .setxattr = ecryptfs_setxattr,
1164         .getxattr = ecryptfs_getxattr,
1165         .listxattr = ecryptfs_listxattr,
1166         .removexattr = ecryptfs_removexattr
1167 };