a8acfc5d34765f940c9a03f4ce864e1b84be846f
[sfrench/cifs-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 <asm/unaligned.h>
36 #include "ecryptfs_kernel.h"
37
38 static struct dentry *lock_parent(struct dentry *dentry)
39 {
40         struct dentry *dir;
41
42         dir = dget_parent(dentry);
43         mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
44         return dir;
45 }
46
47 static void unlock_dir(struct dentry *dir)
48 {
49         mutex_unlock(&dir->d_inode->i_mutex);
50         dput(dir);
51 }
52
53 /**
54  * ecryptfs_create_underlying_file
55  * @lower_dir_inode: inode of the parent in the lower fs of the new file
56  * @dentry: New file's dentry
57  * @mode: The mode of the new file
58  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
59  *
60  * Creates the file in the lower file system.
61  *
62  * Returns zero on success; non-zero on error condition
63  */
64 static int
65 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
66                                 struct dentry *dentry, int mode,
67                                 struct nameidata *nd)
68 {
69         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
70         struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
71         struct dentry *dentry_save;
72         struct vfsmount *vfsmount_save;
73         int rc;
74
75         dentry_save = nd->path.dentry;
76         vfsmount_save = nd->path.mnt;
77         nd->path.dentry = lower_dentry;
78         nd->path.mnt = lower_mnt;
79         rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
80         nd->path.dentry = dentry_save;
81         nd->path.mnt = vfsmount_save;
82         return rc;
83 }
84
85 /**
86  * ecryptfs_do_create
87  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
88  * @ecryptfs_dentry: New file's dentry in ecryptfs
89  * @mode: The mode of the new file
90  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
91  *
92  * Creates the underlying file and the eCryptfs inode which will link to
93  * it. It will also update the eCryptfs directory inode to mimic the
94  * stat of the lower directory inode.
95  *
96  * Returns zero on success; non-zero on error condition
97  */
98 static int
99 ecryptfs_do_create(struct inode *directory_inode,
100                    struct dentry *ecryptfs_dentry, int mode,
101                    struct nameidata *nd)
102 {
103         int rc;
104         struct dentry *lower_dentry;
105         struct dentry *lower_dir_dentry;
106
107         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
108         lower_dir_dentry = lock_parent(lower_dentry);
109         if (IS_ERR(lower_dir_dentry)) {
110                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
111                                 "dentry\n");
112                 rc = PTR_ERR(lower_dir_dentry);
113                 goto out;
114         }
115         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
116                                              ecryptfs_dentry, mode, nd);
117         if (rc) {
118                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
119                        "rc = [%d]\n", __func__, rc);
120                 goto out_lock;
121         }
122         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
123                                 directory_inode->i_sb, 0);
124         if (rc) {
125                 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
126                 goto out_lock;
127         }
128         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
129         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
130 out_lock:
131         unlock_dir(lower_dir_dentry);
132 out:
133         return rc;
134 }
135
136 /**
137  * grow_file
138  * @ecryptfs_dentry: the eCryptfs dentry
139  *
140  * This is the code which will grow the file to its correct size.
141  */
142 static int grow_file(struct dentry *ecryptfs_dentry)
143 {
144         struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode;
145         char zero_virt[] = { 0x00 };
146         int rc = 0;
147
148         rc = ecryptfs_write(ecryptfs_inode, zero_virt, 0, 1);
149         i_size_write(ecryptfs_inode, 0);
150         rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
151         ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |=
152                 ECRYPTFS_NEW_FILE;
153         return rc;
154 }
155
156 /**
157  * ecryptfs_initialize_file
158  *
159  * Cause the file to be changed from a basic empty file to an ecryptfs
160  * file with a header and first data page.
161  *
162  * Returns zero on success
163  */
164 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
165 {
166         struct ecryptfs_crypt_stat *crypt_stat =
167                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
168         int rc = 0;
169
170         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
171                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
172                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
173                 goto out;
174         }
175         crypt_stat->flags |= ECRYPTFS_NEW_FILE;
176         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
177         rc = ecryptfs_new_file_context(ecryptfs_dentry);
178         if (rc) {
179                 ecryptfs_printk(KERN_ERR, "Error creating new file "
180                                 "context; rc = [%d]\n", rc);
181                 goto out;
182         }
183         if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
184                 rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
185                 if (rc) {
186                         printk(KERN_ERR "%s: Error attempting to initialize "
187                                "the persistent file for the dentry with name "
188                                "[%s]; rc = [%d]\n", __func__,
189                                ecryptfs_dentry->d_name.name, rc);
190                         goto out;
191                 }
192         }
193         rc = ecryptfs_write_metadata(ecryptfs_dentry);
194         if (rc) {
195                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
196                 goto out;
197         }
198         rc = grow_file(ecryptfs_dentry);
199         if (rc)
200                 printk(KERN_ERR "Error growing file; rc = [%d]\n", rc);
201 out:
202         return rc;
203 }
204
205 /**
206  * ecryptfs_create
207  * @dir: The inode of the directory in which to create the file.
208  * @dentry: The eCryptfs dentry
209  * @mode: The mode of the new file.
210  * @nd: nameidata
211  *
212  * Creates a new file.
213  *
214  * Returns zero on success; non-zero on error condition
215  */
216 static int
217 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
218                 int mode, struct nameidata *nd)
219 {
220         int rc;
221
222         /* ecryptfs_do_create() calls ecryptfs_interpose() */
223         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
224         if (unlikely(rc)) {
225                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
226                                 "lower filesystem\n");
227                 goto out;
228         }
229         /* At this point, a file exists on "disk"; we need to make sure
230          * that this on disk file is prepared to be an ecryptfs file */
231         rc = ecryptfs_initialize_file(ecryptfs_dentry);
232 out:
233         return rc;
234 }
235
236 /**
237  * ecryptfs_lookup_and_interpose_lower - Perform a lookup
238  */
239 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
240                                         struct dentry *lower_dentry,
241                                         struct inode *ecryptfs_dir_inode,
242                                         struct nameidata *ecryptfs_nd)
243 {
244         struct dentry *lower_dir_dentry;
245         struct vfsmount *lower_mnt;
246         struct inode *lower_inode;
247         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
248         struct ecryptfs_crypt_stat *crypt_stat;
249         char *page_virt = NULL;
250         u64 file_size;
251         int rc = 0;
252
253         lower_dir_dentry = lower_dentry->d_parent;
254         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
255                                    ecryptfs_dentry->d_parent));
256         lower_inode = lower_dentry->d_inode;
257         fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
258         BUG_ON(!atomic_read(&lower_dentry->d_count));
259         ecryptfs_set_dentry_private(ecryptfs_dentry,
260                                     kmem_cache_alloc(ecryptfs_dentry_info_cache,
261                                                      GFP_KERNEL));
262         if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
263                 rc = -ENOMEM;
264                 printk(KERN_ERR "%s: Out of memory whilst attempting "
265                        "to allocate ecryptfs_dentry_info struct\n",
266                         __func__);
267                 goto out_put;
268         }
269         ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
270         ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
271         if (!lower_dentry->d_inode) {
272                 /* We want to add because we couldn't find in lower */
273                 d_add(ecryptfs_dentry, NULL);
274                 goto out;
275         }
276         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
277                                 ecryptfs_dir_inode->i_sb,
278                                 ECRYPTFS_INTERPOSE_FLAG_D_ADD);
279         if (rc) {
280                 printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
281                        __func__, rc);
282                 goto out;
283         }
284         if (S_ISDIR(lower_inode->i_mode))
285                 goto out;
286         if (S_ISLNK(lower_inode->i_mode))
287                 goto out;
288         if (special_file(lower_inode->i_mode))
289                 goto out;
290         if (!ecryptfs_nd)
291                 goto out;
292         /* Released in this function */
293         page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
294         if (!page_virt) {
295                 printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
296                        __func__);
297                 rc = -ENOMEM;
298                 goto out;
299         }
300         if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
301                 rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
302                 if (rc) {
303                         printk(KERN_ERR "%s: Error attempting to initialize "
304                                "the persistent file for the dentry with name "
305                                "[%s]; rc = [%d]\n", __func__,
306                                ecryptfs_dentry->d_name.name, rc);
307                         goto out_free_kmem;
308                 }
309         }
310         crypt_stat = &ecryptfs_inode_to_private(
311                                         ecryptfs_dentry->d_inode)->crypt_stat;
312         /* TODO: lock for crypt_stat comparison */
313         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
314                         ecryptfs_set_default_sizes(crypt_stat);
315         rc = ecryptfs_read_and_validate_header_region(page_virt,
316                                                       ecryptfs_dentry->d_inode);
317         if (rc) {
318                 memset(page_virt, 0, PAGE_CACHE_SIZE);
319                 rc = ecryptfs_read_and_validate_xattr_region(page_virt,
320                                                              ecryptfs_dentry);
321                 if (rc) {
322                         rc = 0;
323                         goto out_free_kmem;
324                 }
325                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
326         }
327         mount_crypt_stat = &ecryptfs_superblock_to_private(
328                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
329         if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
330                 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
331                         file_size = (crypt_stat->metadata_size
332                                      + i_size_read(lower_dentry->d_inode));
333                 else
334                         file_size = i_size_read(lower_dentry->d_inode);
335         } else {
336                 file_size = get_unaligned_be64(page_virt);
337         }
338         i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size);
339 out_free_kmem:
340         kmem_cache_free(ecryptfs_header_cache_2, page_virt);
341         goto out;
342 out_put:
343         dput(lower_dentry);
344         mntput(lower_mnt);
345         d_drop(ecryptfs_dentry);
346 out:
347         return rc;
348 }
349
350 /**
351  * ecryptfs_new_lower_dentry
352  * @ename: The name of the new dentry.
353  * @lower_dir_dentry: Parent directory of the new dentry.
354  * @nd: nameidata from last lookup.
355  *
356  * Create a new dentry or get it from lower parent dir.
357  */
358 static struct dentry *
359 ecryptfs_new_lower_dentry(struct qstr *name, struct dentry *lower_dir_dentry,
360                           struct nameidata *nd)
361 {
362         struct dentry *new_dentry;
363         struct dentry *tmp;
364         struct inode *lower_dir_inode;
365
366         lower_dir_inode = lower_dir_dentry->d_inode;
367
368         tmp = d_alloc(lower_dir_dentry, name);
369         if (!tmp)
370                 return ERR_PTR(-ENOMEM);
371
372         mutex_lock(&lower_dir_inode->i_mutex);
373         new_dentry = lower_dir_inode->i_op->lookup(lower_dir_inode, tmp, nd);
374         mutex_unlock(&lower_dir_inode->i_mutex);
375
376         if (!new_dentry)
377                 new_dentry = tmp;
378         else
379                 dput(tmp);
380
381         return new_dentry;
382 }
383
384
385 /**
386  * ecryptfs_lookup_one_lower
387  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
388  * @lower_dir_dentry: lower parent directory
389  *
390  * Get the lower dentry from vfs. If lower dentry does not exist yet,
391  * create it.
392  */
393 static struct dentry *
394 ecryptfs_lookup_one_lower(struct dentry *ecryptfs_dentry,
395                           struct dentry *lower_dir_dentry)
396 {
397         struct nameidata nd;
398         struct vfsmount *lower_mnt;
399         struct qstr *name;
400         int err;
401
402         name = &ecryptfs_dentry->d_name;
403         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
404                                     ecryptfs_dentry->d_parent));
405         err = vfs_path_lookup(lower_dir_dentry, lower_mnt, name->name , 0, &nd);
406         mntput(lower_mnt);
407
408         if (!err) {
409                 /* we dont need the mount */
410                 mntput(nd.path.mnt);
411                 return nd.path.dentry;
412         }
413         if (err != -ENOENT)
414                 return ERR_PTR(err);
415
416         /* create a new lower dentry */
417         return ecryptfs_new_lower_dentry(name, lower_dir_dentry, &nd);
418 }
419
420 /**
421  * ecryptfs_lookup
422  * @ecryptfs_dir_inode: The eCryptfs directory inode
423  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
424  * @ecryptfs_nd: nameidata; may be NULL
425  *
426  * Find a file on disk. If the file does not exist, then we'll add it to the
427  * dentry cache and continue on to read it from the disk.
428  */
429 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
430                                       struct dentry *ecryptfs_dentry,
431                                       struct nameidata *ecryptfs_nd)
432 {
433         char *encrypted_and_encoded_name = NULL;
434         size_t encrypted_and_encoded_name_size;
435         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
436         struct dentry *lower_dir_dentry, *lower_dentry;
437         int rc = 0;
438
439         ecryptfs_dentry->d_op = &ecryptfs_dops;
440         if ((ecryptfs_dentry->d_name.len == 1
441              && !strcmp(ecryptfs_dentry->d_name.name, "."))
442             || (ecryptfs_dentry->d_name.len == 2
443                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
444                 goto out_d_drop;
445         }
446         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
447
448         lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
449                                                  lower_dir_dentry);
450         if (IS_ERR(lower_dentry)) {
451                 rc = PTR_ERR(lower_dentry);
452                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "
453                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
454                                 encrypted_and_encoded_name);
455                 goto out_d_drop;
456         }
457         if (lower_dentry->d_inode)
458                 goto lookup_and_interpose;
459         mount_crypt_stat = &ecryptfs_superblock_to_private(
460                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
461         if (!(mount_crypt_stat
462             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
463                 goto lookup_and_interpose;
464         dput(lower_dentry);
465         rc = ecryptfs_encrypt_and_encode_filename(
466                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
467                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
468                 ecryptfs_dentry->d_name.len);
469         if (rc) {
470                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
471                        "filename; rc = [%d]\n", __func__, rc);
472                 goto out_d_drop;
473         }
474         lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
475                                                  lower_dir_dentry);
476         if (IS_ERR(lower_dentry)) {
477                 rc = PTR_ERR(lower_dentry);
478                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "
479                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
480                                 encrypted_and_encoded_name);
481                 goto out_d_drop;
482         }
483 lookup_and_interpose:
484         rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
485                                                  ecryptfs_dir_inode,
486                                                  ecryptfs_nd);
487         goto out;
488 out_d_drop:
489         d_drop(ecryptfs_dentry);
490 out:
491         kfree(encrypted_and_encoded_name);
492         return ERR_PTR(rc);
493 }
494
495 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
496                          struct dentry *new_dentry)
497 {
498         struct dentry *lower_old_dentry;
499         struct dentry *lower_new_dentry;
500         struct dentry *lower_dir_dentry;
501         u64 file_size_save;
502         int rc;
503
504         file_size_save = i_size_read(old_dentry->d_inode);
505         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
506         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
507         dget(lower_old_dentry);
508         dget(lower_new_dentry);
509         lower_dir_dentry = lock_parent(lower_new_dentry);
510         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
511                       lower_new_dentry);
512         if (rc || !lower_new_dentry->d_inode)
513                 goto out_lock;
514         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
515         if (rc)
516                 goto out_lock;
517         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
518         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
519         old_dentry->d_inode->i_nlink =
520                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
521         i_size_write(new_dentry->d_inode, file_size_save);
522 out_lock:
523         unlock_dir(lower_dir_dentry);
524         dput(lower_new_dentry);
525         dput(lower_old_dentry);
526         return rc;
527 }
528
529 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
530 {
531         int rc = 0;
532         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
533         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
534         struct dentry *lower_dir_dentry;
535
536         dget(lower_dentry);
537         lower_dir_dentry = lock_parent(lower_dentry);
538         rc = vfs_unlink(lower_dir_inode, lower_dentry);
539         if (rc) {
540                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
541                 goto out_unlock;
542         }
543         fsstack_copy_attr_times(dir, lower_dir_inode);
544         dentry->d_inode->i_nlink =
545                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
546         dentry->d_inode->i_ctime = dir->i_ctime;
547         d_drop(dentry);
548 out_unlock:
549         unlock_dir(lower_dir_dentry);
550         dput(lower_dentry);
551         return rc;
552 }
553
554 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
555                             const char *symname)
556 {
557         int rc;
558         struct dentry *lower_dentry;
559         struct dentry *lower_dir_dentry;
560         char *encoded_symname;
561         size_t encoded_symlen;
562         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
563
564         lower_dentry = ecryptfs_dentry_to_lower(dentry);
565         dget(lower_dentry);
566         lower_dir_dentry = lock_parent(lower_dentry);
567         mount_crypt_stat = &ecryptfs_superblock_to_private(
568                 dir->i_sb)->mount_crypt_stat;
569         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
570                                                   &encoded_symlen,
571                                                   NULL,
572                                                   mount_crypt_stat, symname,
573                                                   strlen(symname));
574         if (rc)
575                 goto out_lock;
576         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
577                          encoded_symname);
578         kfree(encoded_symname);
579         if (rc || !lower_dentry->d_inode)
580                 goto out_lock;
581         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
582         if (rc)
583                 goto out_lock;
584         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
585         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
586 out_lock:
587         unlock_dir(lower_dir_dentry);
588         dput(lower_dentry);
589         if (!dentry->d_inode)
590                 d_drop(dentry);
591         return rc;
592 }
593
594 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
595 {
596         int rc;
597         struct dentry *lower_dentry;
598         struct dentry *lower_dir_dentry;
599
600         lower_dentry = ecryptfs_dentry_to_lower(dentry);
601         lower_dir_dentry = lock_parent(lower_dentry);
602         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
603         if (rc || !lower_dentry->d_inode)
604                 goto out;
605         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
606         if (rc)
607                 goto out;
608         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
609         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
610         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
611 out:
612         unlock_dir(lower_dir_dentry);
613         if (!dentry->d_inode)
614                 d_drop(dentry);
615         return rc;
616 }
617
618 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
619 {
620         struct dentry *lower_dentry;
621         struct dentry *lower_dir_dentry;
622         int rc;
623
624         lower_dentry = ecryptfs_dentry_to_lower(dentry);
625         dget(dentry);
626         lower_dir_dentry = lock_parent(lower_dentry);
627         dget(lower_dentry);
628         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
629         dput(lower_dentry);
630         if (!rc)
631                 d_delete(lower_dentry);
632         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
633         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
634         unlock_dir(lower_dir_dentry);
635         if (!rc)
636                 d_drop(dentry);
637         dput(dentry);
638         return rc;
639 }
640
641 static int
642 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
643 {
644         int rc;
645         struct dentry *lower_dentry;
646         struct dentry *lower_dir_dentry;
647
648         lower_dentry = ecryptfs_dentry_to_lower(dentry);
649         lower_dir_dentry = lock_parent(lower_dentry);
650         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
651         if (rc || !lower_dentry->d_inode)
652                 goto out;
653         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
654         if (rc)
655                 goto out;
656         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
657         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
658 out:
659         unlock_dir(lower_dir_dentry);
660         if (!dentry->d_inode)
661                 d_drop(dentry);
662         return rc;
663 }
664
665 static int
666 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
667                 struct inode *new_dir, struct dentry *new_dentry)
668 {
669         int rc;
670         struct dentry *lower_old_dentry;
671         struct dentry *lower_new_dentry;
672         struct dentry *lower_old_dir_dentry;
673         struct dentry *lower_new_dir_dentry;
674         struct dentry *trap = NULL;
675
676         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
677         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
678         dget(lower_old_dentry);
679         dget(lower_new_dentry);
680         lower_old_dir_dentry = dget_parent(lower_old_dentry);
681         lower_new_dir_dentry = dget_parent(lower_new_dentry);
682         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
683         /* source should not be ancestor of target */
684         if (trap == lower_old_dentry) {
685                 rc = -EINVAL;
686                 goto out_lock;
687         }
688         /* target should not be ancestor of source */
689         if (trap == lower_new_dentry) {
690                 rc = -ENOTEMPTY;
691                 goto out_lock;
692         }
693         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
694                         lower_new_dir_dentry->d_inode, lower_new_dentry);
695         if (rc)
696                 goto out_lock;
697         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
698         if (new_dir != old_dir)
699                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
700 out_lock:
701         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
702         dput(lower_new_dentry->d_parent);
703         dput(lower_old_dentry->d_parent);
704         dput(lower_new_dentry);
705         dput(lower_old_dentry);
706         return rc;
707 }
708
709 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
710                                    size_t *bufsiz)
711 {
712         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
713         char *lower_buf;
714         size_t lower_bufsiz = PATH_MAX;
715         mm_segment_t old_fs;
716         int rc;
717
718         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
719         if (!lower_buf) {
720                 rc = -ENOMEM;
721                 goto out;
722         }
723         old_fs = get_fs();
724         set_fs(get_ds());
725         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
726                                                    (char __user *)lower_buf,
727                                                    lower_bufsiz);
728         set_fs(old_fs);
729         if (rc < 0)
730                 goto out;
731         lower_bufsiz = rc;
732         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
733                                                   lower_buf, lower_bufsiz);
734 out:
735         kfree(lower_buf);
736         return rc;
737 }
738
739 static int
740 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
741 {
742         char *kbuf;
743         size_t kbufsiz, copied;
744         int rc;
745
746         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
747         if (rc)
748                 goto out;
749         copied = min_t(size_t, bufsiz, kbufsiz);
750         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
751         kfree(kbuf);
752         fsstack_copy_attr_atime(dentry->d_inode,
753                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
754 out:
755         return rc;
756 }
757
758 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
759 {
760         char *buf;
761         int len = PAGE_SIZE, rc;
762         mm_segment_t old_fs;
763
764         /* Released in ecryptfs_put_link(); only release here on error */
765         buf = kmalloc(len, GFP_KERNEL);
766         if (!buf) {
767                 buf = ERR_PTR(-ENOMEM);
768                 goto out;
769         }
770         old_fs = get_fs();
771         set_fs(get_ds());
772         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
773         set_fs(old_fs);
774         if (rc < 0) {
775                 kfree(buf);
776                 buf = ERR_PTR(rc);
777         } else
778                 buf[rc] = '\0';
779 out:
780         nd_set_link(nd, buf);
781         return NULL;
782 }
783
784 static void
785 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
786 {
787         char *buf = nd_get_link(nd);
788         if (!IS_ERR(buf)) {
789                 /* Free the char* */
790                 kfree(buf);
791         }
792 }
793
794 /**
795  * upper_size_to_lower_size
796  * @crypt_stat: Crypt_stat associated with file
797  * @upper_size: Size of the upper file
798  *
799  * Calculate the required size of the lower file based on the
800  * specified size of the upper file. This calculation is based on the
801  * number of headers in the underlying file and the extent size.
802  *
803  * Returns Calculated size of the lower file.
804  */
805 static loff_t
806 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
807                          loff_t upper_size)
808 {
809         loff_t lower_size;
810
811         lower_size = ecryptfs_lower_header_size(crypt_stat);
812         if (upper_size != 0) {
813                 loff_t num_extents;
814
815                 num_extents = upper_size >> crypt_stat->extent_shift;
816                 if (upper_size & ~crypt_stat->extent_mask)
817                         num_extents++;
818                 lower_size += (num_extents * crypt_stat->extent_size);
819         }
820         return lower_size;
821 }
822
823 /**
824  * truncate_upper
825  * @dentry: The ecryptfs layer dentry
826  * @ia: Address of the ecryptfs inode's attributes
827  * @lower_ia: Address of the lower inode's attributes
828  *
829  * Function to handle truncations modifying the size of the file. Note
830  * that the file sizes are interpolated. When expanding, we are simply
831  * writing strings of 0's out. When truncating, we truncate the upper
832  * inode and update the lower_ia according to the page index
833  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
834  * the caller must use lower_ia in a call to notify_change() to perform
835  * the truncation of the lower inode.
836  *
837  * Returns zero on success; non-zero otherwise
838  */
839 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
840                           struct iattr *lower_ia)
841 {
842         int rc = 0;
843         struct inode *inode = dentry->d_inode;
844         struct ecryptfs_crypt_stat *crypt_stat;
845         loff_t i_size = i_size_read(inode);
846         loff_t lower_size_before_truncate;
847         loff_t lower_size_after_truncate;
848
849         if (unlikely((ia->ia_size == i_size))) {
850                 lower_ia->ia_valid &= ~ATTR_SIZE;
851                 goto out;
852         }
853         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
854         /* Switch on growing or shrinking file */
855         if (ia->ia_size > i_size) {
856                 char zero[] = { 0x00 };
857
858                 lower_ia->ia_valid &= ~ATTR_SIZE;
859                 /* Write a single 0 at the last position of the file;
860                  * this triggers code that will fill in 0's throughout
861                  * the intermediate portion of the previous end of the
862                  * file and the new and of the file */
863                 rc = ecryptfs_write(inode, zero,
864                                     (ia->ia_size - 1), 1);
865         } else { /* ia->ia_size < i_size_read(inode) */
866                 /* We're chopping off all the pages down to the page
867                  * in which ia->ia_size is located. Fill in the end of
868                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
869                  * PAGE_CACHE_SIZE with zeros. */
870                 size_t num_zeros = (PAGE_CACHE_SIZE
871                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
872
873                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
874                         rc = simple_setsize(inode, ia->ia_size);
875                         if (rc)
876                                 goto out;
877                         lower_ia->ia_size = ia->ia_size;
878                         lower_ia->ia_valid |= ATTR_SIZE;
879                         goto out;
880                 }
881                 if (num_zeros) {
882                         char *zeros_virt;
883
884                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
885                         if (!zeros_virt) {
886                                 rc = -ENOMEM;
887                                 goto out;
888                         }
889                         rc = ecryptfs_write(inode, zeros_virt,
890                                             ia->ia_size, num_zeros);
891                         kfree(zeros_virt);
892                         if (rc) {
893                                 printk(KERN_ERR "Error attempting to zero out "
894                                        "the remainder of the end page on "
895                                        "reducing truncate; rc = [%d]\n", rc);
896                                 goto out;
897                         }
898                 }
899                 simple_setsize(inode, ia->ia_size);
900                 rc = ecryptfs_write_inode_size_to_metadata(inode);
901                 if (rc) {
902                         printk(KERN_ERR "Problem with "
903                                "ecryptfs_write_inode_size_to_metadata; "
904                                "rc = [%d]\n", rc);
905                         goto out;
906                 }
907                 /* We are reducing the size of the ecryptfs file, and need to
908                  * know if we need to reduce the size of the lower file. */
909                 lower_size_before_truncate =
910                     upper_size_to_lower_size(crypt_stat, i_size);
911                 lower_size_after_truncate =
912                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
913                 if (lower_size_after_truncate < lower_size_before_truncate) {
914                         lower_ia->ia_size = lower_size_after_truncate;
915                         lower_ia->ia_valid |= ATTR_SIZE;
916                 } else
917                         lower_ia->ia_valid &= ~ATTR_SIZE;
918         }
919 out:
920         return rc;
921 }
922
923 /**
924  * ecryptfs_truncate
925  * @dentry: The ecryptfs layer dentry
926  * @new_length: The length to expand the file to
927  *
928  * Simple function that handles the truncation of an eCryptfs inode and
929  * its corresponding lower inode.
930  *
931  * Returns zero on success; non-zero otherwise
932  */
933 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
934 {
935         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
936         struct iattr lower_ia = { .ia_valid = 0 };
937         int rc;
938
939         rc = truncate_upper(dentry, &ia, &lower_ia);
940         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
941                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
942
943                 mutex_lock(&lower_dentry->d_inode->i_mutex);
944                 rc = notify_change(lower_dentry, &lower_ia);
945                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
946         }
947         return rc;
948 }
949
950 static int
951 ecryptfs_permission(struct inode *inode, int mask)
952 {
953         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
954 }
955
956 /**
957  * ecryptfs_setattr
958  * @dentry: dentry handle to the inode to modify
959  * @ia: Structure with flags of what to change and values
960  *
961  * Updates the metadata of an inode. If the update is to the size
962  * i.e. truncation, then ecryptfs_truncate will handle the size modification
963  * of both the ecryptfs inode and the lower inode.
964  *
965  * All other metadata changes will be passed right to the lower filesystem,
966  * and we will just update our inode to look like the lower.
967  */
968 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
969 {
970         int rc = 0;
971         struct dentry *lower_dentry;
972         struct iattr lower_ia;
973         struct inode *inode;
974         struct inode *lower_inode;
975         struct ecryptfs_crypt_stat *crypt_stat;
976
977         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
978         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
979                 ecryptfs_init_crypt_stat(crypt_stat);
980         inode = dentry->d_inode;
981         lower_inode = ecryptfs_inode_to_lower(inode);
982         lower_dentry = ecryptfs_dentry_to_lower(dentry);
983         mutex_lock(&crypt_stat->cs_mutex);
984         if (S_ISDIR(dentry->d_inode->i_mode))
985                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
986         else if (S_ISREG(dentry->d_inode->i_mode)
987                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
988                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
989                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
990
991                 mount_crypt_stat = &ecryptfs_superblock_to_private(
992                         dentry->d_sb)->mount_crypt_stat;
993                 rc = ecryptfs_read_metadata(dentry);
994                 if (rc) {
995                         if (!(mount_crypt_stat->flags
996                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
997                                 rc = -EIO;
998                                 printk(KERN_WARNING "Either the lower file "
999                                        "is not in a valid eCryptfs format, "
1000                                        "or the key could not be retrieved. "
1001                                        "Plaintext passthrough mode is not "
1002                                        "enabled; returning -EIO\n");
1003                                 mutex_unlock(&crypt_stat->cs_mutex);
1004                                 goto out;
1005                         }
1006                         rc = 0;
1007                         crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
1008                 }
1009         }
1010         mutex_unlock(&crypt_stat->cs_mutex);
1011         memcpy(&lower_ia, ia, sizeof(lower_ia));
1012         if (ia->ia_valid & ATTR_FILE)
1013                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
1014         if (ia->ia_valid & ATTR_SIZE) {
1015                 rc = truncate_upper(dentry, ia, &lower_ia);
1016                 if (rc < 0)
1017                         goto out;
1018         }
1019
1020         /*
1021          * mode change is for clearing setuid/setgid bits. Allow lower fs
1022          * to interpret this in its own way.
1023          */
1024         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1025                 lower_ia.ia_valid &= ~ATTR_MODE;
1026
1027         mutex_lock(&lower_dentry->d_inode->i_mutex);
1028         rc = notify_change(lower_dentry, &lower_ia);
1029         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1030 out:
1031         fsstack_copy_attr_all(inode, lower_inode);
1032         return rc;
1033 }
1034
1035 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1036                           struct kstat *stat)
1037 {
1038         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1039         int rc = 0;
1040
1041         mount_crypt_stat = &ecryptfs_superblock_to_private(
1042                                                 dentry->d_sb)->mount_crypt_stat;
1043         generic_fillattr(dentry->d_inode, stat);
1044         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1045                 char *target;
1046                 size_t targetsiz;
1047
1048                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1049                 if (!rc) {
1050                         kfree(target);
1051                         stat->size = targetsiz;
1052                 }
1053         }
1054         return rc;
1055 }
1056
1057 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1058                      struct kstat *stat)
1059 {
1060         struct kstat lower_stat;
1061         int rc;
1062
1063         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1064                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1065         if (!rc) {
1066                 generic_fillattr(dentry->d_inode, stat);
1067                 stat->blocks = lower_stat.blocks;
1068         }
1069         return rc;
1070 }
1071
1072 int
1073 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1074                   size_t size, int flags)
1075 {
1076         int rc = 0;
1077         struct dentry *lower_dentry;
1078
1079         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1080         if (!lower_dentry->d_inode->i_op->setxattr) {
1081                 rc = -EOPNOTSUPP;
1082                 goto out;
1083         }
1084         mutex_lock(&lower_dentry->d_inode->i_mutex);
1085         rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value,
1086                                                    size, flags);
1087         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1088 out:
1089         return rc;
1090 }
1091
1092 ssize_t
1093 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1094                         void *value, size_t size)
1095 {
1096         int rc = 0;
1097
1098         if (!lower_dentry->d_inode->i_op->getxattr) {
1099                 rc = -EOPNOTSUPP;
1100                 goto out;
1101         }
1102         mutex_lock(&lower_dentry->d_inode->i_mutex);
1103         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1104                                                    size);
1105         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1106 out:
1107         return rc;
1108 }
1109
1110 static ssize_t
1111 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1112                   size_t size)
1113 {
1114         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1115                                        value, size);
1116 }
1117
1118 static ssize_t
1119 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1120 {
1121         int rc = 0;
1122         struct dentry *lower_dentry;
1123
1124         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1125         if (!lower_dentry->d_inode->i_op->listxattr) {
1126                 rc = -EOPNOTSUPP;
1127                 goto out;
1128         }
1129         mutex_lock(&lower_dentry->d_inode->i_mutex);
1130         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1131         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1132 out:
1133         return rc;
1134 }
1135
1136 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1137 {
1138         int rc = 0;
1139         struct dentry *lower_dentry;
1140
1141         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1142         if (!lower_dentry->d_inode->i_op->removexattr) {
1143                 rc = -EOPNOTSUPP;
1144                 goto out;
1145         }
1146         mutex_lock(&lower_dentry->d_inode->i_mutex);
1147         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1148         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1149 out:
1150         return rc;
1151 }
1152
1153 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
1154 {
1155         if ((ecryptfs_inode_to_lower(inode)
1156              == (struct inode *)candidate_lower_inode))
1157                 return 1;
1158         else
1159                 return 0;
1160 }
1161
1162 int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
1163 {
1164         ecryptfs_init_inode(inode, (struct inode *)lower_inode);
1165         return 0;
1166 }
1167
1168 const struct inode_operations ecryptfs_symlink_iops = {
1169         .readlink = ecryptfs_readlink,
1170         .follow_link = ecryptfs_follow_link,
1171         .put_link = ecryptfs_put_link,
1172         .permission = ecryptfs_permission,
1173         .setattr = ecryptfs_setattr,
1174         .getattr = ecryptfs_getattr_link,
1175         .setxattr = ecryptfs_setxattr,
1176         .getxattr = ecryptfs_getxattr,
1177         .listxattr = ecryptfs_listxattr,
1178         .removexattr = ecryptfs_removexattr
1179 };
1180
1181 const struct inode_operations ecryptfs_dir_iops = {
1182         .create = ecryptfs_create,
1183         .lookup = ecryptfs_lookup,
1184         .link = ecryptfs_link,
1185         .unlink = ecryptfs_unlink,
1186         .symlink = ecryptfs_symlink,
1187         .mkdir = ecryptfs_mkdir,
1188         .rmdir = ecryptfs_rmdir,
1189         .mknod = ecryptfs_mknod,
1190         .rename = ecryptfs_rename,
1191         .permission = ecryptfs_permission,
1192         .setattr = ecryptfs_setattr,
1193         .setxattr = ecryptfs_setxattr,
1194         .getxattr = ecryptfs_getxattr,
1195         .listxattr = ecryptfs_listxattr,
1196         .removexattr = ecryptfs_removexattr
1197 };
1198
1199 const struct inode_operations ecryptfs_main_iops = {
1200         .permission = ecryptfs_permission,
1201         .setattr = ecryptfs_setattr,
1202         .getattr = ecryptfs_getattr,
1203         .setxattr = ecryptfs_setxattr,
1204         .getxattr = ecryptfs_getxattr,
1205         .listxattr = ecryptfs_listxattr,
1206         .removexattr = ecryptfs_removexattr
1207 };