ecryptfs: call vfs_setxattr() in ecryptfs_setxattr()
[linux-2.6.git] / fs / ecryptfs / inode.c
1 /**
2  * eCryptfs: Linux filesystem encryption layer
3  *
4  * Copyright (C) 1997-2004 Erez Zadok
5  * Copyright (C) 2001-2004 Stony Brook University
6  * Copyright (C) 2004-2007 International Business Machines Corp.
7  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
8  *              Michael C. Thompsion <mcthomps@us.ibm.com>
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public License as
12  * published by the Free Software Foundation; either version 2 of the
13  * License, or (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful, but
16  * WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  * General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
23  * 02111-1307, USA.
24  */
25
26 #include <linux/file.h>
27 #include <linux/vmalloc.h>
28 #include <linux/pagemap.h>
29 #include <linux/dcache.h>
30 #include <linux/namei.h>
31 #include <linux/mount.h>
32 #include <linux/crypto.h>
33 #include <linux/fs_stack.h>
34 #include <linux/slab.h>
35 #include <linux/xattr.h>
36 #include <asm/unaligned.h>
37 #include "ecryptfs_kernel.h"
38
39 static struct dentry *lock_parent(struct dentry *dentry)
40 {
41         struct dentry *dir;
42
43         dir = dget_parent(dentry);
44         mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
45         return dir;
46 }
47
48 static void unlock_dir(struct dentry *dir)
49 {
50         mutex_unlock(&dir->d_inode->i_mutex);
51         dput(dir);
52 }
53
54 /**
55  * ecryptfs_create_underlying_file
56  * @lower_dir_inode: inode of the parent in the lower fs of the new file
57  * @dentry: New file's dentry
58  * @mode: The mode of the new file
59  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
60  *
61  * Creates the file in the lower file system.
62  *
63  * Returns zero on success; non-zero on error condition
64  */
65 static int
66 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
67                                 struct dentry *dentry, int mode,
68                                 struct nameidata *nd)
69 {
70         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
71         struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
72         struct dentry *dentry_save;
73         struct vfsmount *vfsmount_save;
74         int rc;
75
76         dentry_save = nd->path.dentry;
77         vfsmount_save = nd->path.mnt;
78         nd->path.dentry = lower_dentry;
79         nd->path.mnt = lower_mnt;
80         rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
81         nd->path.dentry = dentry_save;
82         nd->path.mnt = vfsmount_save;
83         return rc;
84 }
85
86 /**
87  * ecryptfs_do_create
88  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
89  * @ecryptfs_dentry: New file's dentry in ecryptfs
90  * @mode: The mode of the new file
91  * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
92  *
93  * Creates the underlying file and the eCryptfs inode which will link to
94  * it. It will also update the eCryptfs directory inode to mimic the
95  * stat of the lower directory inode.
96  *
97  * Returns zero on success; non-zero on error condition
98  */
99 static int
100 ecryptfs_do_create(struct inode *directory_inode,
101                    struct dentry *ecryptfs_dentry, int mode,
102                    struct nameidata *nd)
103 {
104         int rc;
105         struct dentry *lower_dentry;
106         struct dentry *lower_dir_dentry;
107
108         lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
109         lower_dir_dentry = lock_parent(lower_dentry);
110         if (IS_ERR(lower_dir_dentry)) {
111                 ecryptfs_printk(KERN_ERR, "Error locking directory of "
112                                 "dentry\n");
113                 rc = PTR_ERR(lower_dir_dentry);
114                 goto out;
115         }
116         rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
117                                              ecryptfs_dentry, mode, nd);
118         if (rc) {
119                 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
120                        "rc = [%d]\n", __func__, rc);
121                 goto out_lock;
122         }
123         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
124                                 directory_inode->i_sb, 0);
125         if (rc) {
126                 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
127                 goto out_lock;
128         }
129         fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
130         fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
131 out_lock:
132         unlock_dir(lower_dir_dentry);
133 out:
134         return rc;
135 }
136
137 /**
138  * grow_file
139  * @ecryptfs_dentry: the eCryptfs dentry
140  *
141  * This is the code which will grow the file to its correct size.
142  */
143 static int grow_file(struct dentry *ecryptfs_dentry)
144 {
145         struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode;
146         char zero_virt[] = { 0x00 };
147         int rc = 0;
148
149         rc = ecryptfs_write(ecryptfs_inode, zero_virt, 0, 1);
150         i_size_write(ecryptfs_inode, 0);
151         rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
152         ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |=
153                 ECRYPTFS_NEW_FILE;
154         return rc;
155 }
156
157 /**
158  * ecryptfs_initialize_file
159  *
160  * Cause the file to be changed from a basic empty file to an ecryptfs
161  * file with a header and first data page.
162  *
163  * Returns zero on success
164  */
165 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
166 {
167         struct ecryptfs_crypt_stat *crypt_stat =
168                 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
169         int rc = 0;
170
171         if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
172                 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
173                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
174                 goto out;
175         }
176         crypt_stat->flags |= ECRYPTFS_NEW_FILE;
177         ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
178         rc = ecryptfs_new_file_context(ecryptfs_dentry);
179         if (rc) {
180                 ecryptfs_printk(KERN_ERR, "Error creating new file "
181                                 "context; rc = [%d]\n", rc);
182                 goto out;
183         }
184         if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
185                 rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
186                 if (rc) {
187                         printk(KERN_ERR "%s: Error attempting to initialize "
188                                "the persistent file for the dentry with name "
189                                "[%s]; rc = [%d]\n", __func__,
190                                ecryptfs_dentry->d_name.name, rc);
191                         goto out;
192                 }
193         }
194         rc = ecryptfs_write_metadata(ecryptfs_dentry);
195         if (rc) {
196                 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
197                 goto out;
198         }
199         rc = grow_file(ecryptfs_dentry);
200         if (rc)
201                 printk(KERN_ERR "Error growing file; rc = [%d]\n", rc);
202 out:
203         return rc;
204 }
205
206 /**
207  * ecryptfs_create
208  * @dir: The inode of the directory in which to create the file.
209  * @dentry: The eCryptfs dentry
210  * @mode: The mode of the new file.
211  * @nd: nameidata
212  *
213  * Creates a new file.
214  *
215  * Returns zero on success; non-zero on error condition
216  */
217 static int
218 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
219                 int mode, struct nameidata *nd)
220 {
221         int rc;
222
223         /* ecryptfs_do_create() calls ecryptfs_interpose() */
224         rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
225         if (unlikely(rc)) {
226                 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
227                                 "lower filesystem\n");
228                 goto out;
229         }
230         /* At this point, a file exists on "disk"; we need to make sure
231          * that this on disk file is prepared to be an ecryptfs file */
232         rc = ecryptfs_initialize_file(ecryptfs_dentry);
233 out:
234         return rc;
235 }
236
237 /**
238  * ecryptfs_lookup_and_interpose_lower - Perform a lookup
239  */
240 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
241                                         struct dentry *lower_dentry,
242                                         struct inode *ecryptfs_dir_inode,
243                                         struct nameidata *ecryptfs_nd)
244 {
245         struct dentry *lower_dir_dentry;
246         struct vfsmount *lower_mnt;
247         struct inode *lower_inode;
248         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
249         struct ecryptfs_crypt_stat *crypt_stat;
250         char *page_virt = NULL;
251         u64 file_size;
252         int rc = 0;
253
254         lower_dir_dentry = lower_dentry->d_parent;
255         lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
256                                    ecryptfs_dentry->d_parent));
257         lower_inode = lower_dentry->d_inode;
258         fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
259         BUG_ON(!atomic_read(&lower_dentry->d_count));
260         ecryptfs_set_dentry_private(ecryptfs_dentry,
261                                     kmem_cache_alloc(ecryptfs_dentry_info_cache,
262                                                      GFP_KERNEL));
263         if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
264                 rc = -ENOMEM;
265                 printk(KERN_ERR "%s: Out of memory whilst attempting "
266                        "to allocate ecryptfs_dentry_info struct\n",
267                         __func__);
268                 goto out_put;
269         }
270         ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
271         ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
272         if (!lower_dentry->d_inode) {
273                 /* We want to add because we couldn't find in lower */
274                 d_add(ecryptfs_dentry, NULL);
275                 goto out;
276         }
277         rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
278                                 ecryptfs_dir_inode->i_sb,
279                                 ECRYPTFS_INTERPOSE_FLAG_D_ADD);
280         if (rc) {
281                 printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
282                        __func__, rc);
283                 goto out;
284         }
285         if (S_ISDIR(lower_inode->i_mode))
286                 goto out;
287         if (S_ISLNK(lower_inode->i_mode))
288                 goto out;
289         if (special_file(lower_inode->i_mode))
290                 goto out;
291         if (!ecryptfs_nd)
292                 goto out;
293         /* Released in this function */
294         page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
295         if (!page_virt) {
296                 printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
297                        __func__);
298                 rc = -ENOMEM;
299                 goto out;
300         }
301         if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
302                 rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
303                 if (rc) {
304                         printk(KERN_ERR "%s: Error attempting to initialize "
305                                "the persistent file for the dentry with name "
306                                "[%s]; rc = [%d]\n", __func__,
307                                ecryptfs_dentry->d_name.name, rc);
308                         goto out_free_kmem;
309                 }
310         }
311         crypt_stat = &ecryptfs_inode_to_private(
312                                         ecryptfs_dentry->d_inode)->crypt_stat;
313         /* TODO: lock for crypt_stat comparison */
314         if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
315                         ecryptfs_set_default_sizes(crypt_stat);
316         rc = ecryptfs_read_and_validate_header_region(page_virt,
317                                                       ecryptfs_dentry->d_inode);
318         if (rc) {
319                 memset(page_virt, 0, PAGE_CACHE_SIZE);
320                 rc = ecryptfs_read_and_validate_xattr_region(page_virt,
321                                                              ecryptfs_dentry);
322                 if (rc) {
323                         rc = 0;
324                         goto out_free_kmem;
325                 }
326                 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
327         }
328         mount_crypt_stat = &ecryptfs_superblock_to_private(
329                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
330         if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
331                 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
332                         file_size = (crypt_stat->metadata_size
333                                      + i_size_read(lower_dentry->d_inode));
334                 else
335                         file_size = i_size_read(lower_dentry->d_inode);
336         } else {
337                 file_size = get_unaligned_be64(page_virt);
338         }
339         i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size);
340 out_free_kmem:
341         kmem_cache_free(ecryptfs_header_cache_2, page_virt);
342         goto out;
343 out_put:
344         dput(lower_dentry);
345         mntput(lower_mnt);
346         d_drop(ecryptfs_dentry);
347 out:
348         return rc;
349 }
350
351 /**
352  * ecryptfs_new_lower_dentry
353  * @name: The name of the new dentry.
354  * @lower_dir_dentry: Parent directory of the new dentry.
355  * @nd: nameidata from last lookup.
356  *
357  * Create a new dentry or get it from lower parent dir.
358  */
359 static struct dentry *
360 ecryptfs_new_lower_dentry(struct qstr *name, struct dentry *lower_dir_dentry,
361                           struct nameidata *nd)
362 {
363         struct dentry *new_dentry;
364         struct dentry *tmp;
365         struct inode *lower_dir_inode;
366
367         lower_dir_inode = lower_dir_dentry->d_inode;
368
369         tmp = d_alloc(lower_dir_dentry, name);
370         if (!tmp)
371                 return ERR_PTR(-ENOMEM);
372
373         mutex_lock(&lower_dir_inode->i_mutex);
374         new_dentry = lower_dir_inode->i_op->lookup(lower_dir_inode, tmp, nd);
375         mutex_unlock(&lower_dir_inode->i_mutex);
376
377         if (!new_dentry)
378                 new_dentry = tmp;
379         else
380                 dput(tmp);
381
382         return new_dentry;
383 }
384
385
386 /**
387  * ecryptfs_lookup_one_lower
388  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
389  * @lower_dir_dentry: lower parent directory
390  * @name: lower file name
391  *
392  * Get the lower dentry from vfs. If lower dentry does not exist yet,
393  * create it.
394  */
395 static struct dentry *
396 ecryptfs_lookup_one_lower(struct dentry *ecryptfs_dentry,
397                           struct dentry *lower_dir_dentry, struct qstr *name)
398 {
399         struct nameidata nd;
400         struct vfsmount *lower_mnt;
401         int err;
402
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         struct qstr lower_name;
438         int rc = 0;
439
440         ecryptfs_dentry->d_op = &ecryptfs_dops;
441         if ((ecryptfs_dentry->d_name.len == 1
442              && !strcmp(ecryptfs_dentry->d_name.name, "."))
443             || (ecryptfs_dentry->d_name.len == 2
444                 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
445                 goto out_d_drop;
446         }
447         lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
448         lower_name.name = ecryptfs_dentry->d_name.name;
449         lower_name.len = ecryptfs_dentry->d_name.len;
450         lower_name.hash = ecryptfs_dentry->d_name.hash;
451         if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) {
452                 rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry,
453                                                     &lower_name);
454                 if (rc < 0)
455                         goto out_d_drop;
456         }
457         lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
458                                                  lower_dir_dentry, &lower_name);
459         if (IS_ERR(lower_dentry)) {
460                 rc = PTR_ERR(lower_dentry);
461                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "
462                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
463                                 encrypted_and_encoded_name);
464                 goto out_d_drop;
465         }
466         if (lower_dentry->d_inode)
467                 goto lookup_and_interpose;
468         mount_crypt_stat = &ecryptfs_superblock_to_private(
469                                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
470         if (!(mount_crypt_stat
471             && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
472                 goto lookup_and_interpose;
473         dput(lower_dentry);
474         rc = ecryptfs_encrypt_and_encode_filename(
475                 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
476                 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
477                 ecryptfs_dentry->d_name.len);
478         if (rc) {
479                 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
480                        "filename; rc = [%d]\n", __func__, rc);
481                 goto out_d_drop;
482         }
483         lower_name.name = encrypted_and_encoded_name;
484         lower_name.len = encrypted_and_encoded_name_size;
485         lower_name.hash = full_name_hash(lower_name.name, lower_name.len);
486         if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) {
487                 rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry,
488                                                     &lower_name);
489                 if (rc < 0)
490                         goto out_d_drop;
491         }
492         lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
493                                                  lower_dir_dentry, &lower_name);
494         if (IS_ERR(lower_dentry)) {
495                 rc = PTR_ERR(lower_dentry);
496                 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "
497                                 "[%d] on lower_dentry = [%s]\n", __func__, rc,
498                                 encrypted_and_encoded_name);
499                 goto out_d_drop;
500         }
501 lookup_and_interpose:
502         rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
503                                                  ecryptfs_dir_inode,
504                                                  ecryptfs_nd);
505         goto out;
506 out_d_drop:
507         d_drop(ecryptfs_dentry);
508 out:
509         kfree(encrypted_and_encoded_name);
510         return ERR_PTR(rc);
511 }
512
513 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
514                          struct dentry *new_dentry)
515 {
516         struct dentry *lower_old_dentry;
517         struct dentry *lower_new_dentry;
518         struct dentry *lower_dir_dentry;
519         u64 file_size_save;
520         int rc;
521
522         file_size_save = i_size_read(old_dentry->d_inode);
523         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
524         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
525         dget(lower_old_dentry);
526         dget(lower_new_dentry);
527         lower_dir_dentry = lock_parent(lower_new_dentry);
528         rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
529                       lower_new_dentry);
530         if (rc || !lower_new_dentry->d_inode)
531                 goto out_lock;
532         rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
533         if (rc)
534                 goto out_lock;
535         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
536         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
537         old_dentry->d_inode->i_nlink =
538                 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
539         i_size_write(new_dentry->d_inode, file_size_save);
540 out_lock:
541         unlock_dir(lower_dir_dentry);
542         dput(lower_new_dentry);
543         dput(lower_old_dentry);
544         return rc;
545 }
546
547 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
548 {
549         int rc = 0;
550         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
551         struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
552         struct dentry *lower_dir_dentry;
553
554         dget(lower_dentry);
555         lower_dir_dentry = lock_parent(lower_dentry);
556         rc = vfs_unlink(lower_dir_inode, lower_dentry);
557         if (rc) {
558                 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
559                 goto out_unlock;
560         }
561         fsstack_copy_attr_times(dir, lower_dir_inode);
562         dentry->d_inode->i_nlink =
563                 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
564         dentry->d_inode->i_ctime = dir->i_ctime;
565         d_drop(dentry);
566 out_unlock:
567         unlock_dir(lower_dir_dentry);
568         dput(lower_dentry);
569         return rc;
570 }
571
572 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
573                             const char *symname)
574 {
575         int rc;
576         struct dentry *lower_dentry;
577         struct dentry *lower_dir_dentry;
578         char *encoded_symname;
579         size_t encoded_symlen;
580         struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
581
582         lower_dentry = ecryptfs_dentry_to_lower(dentry);
583         dget(lower_dentry);
584         lower_dir_dentry = lock_parent(lower_dentry);
585         mount_crypt_stat = &ecryptfs_superblock_to_private(
586                 dir->i_sb)->mount_crypt_stat;
587         rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
588                                                   &encoded_symlen,
589                                                   NULL,
590                                                   mount_crypt_stat, symname,
591                                                   strlen(symname));
592         if (rc)
593                 goto out_lock;
594         rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
595                          encoded_symname);
596         kfree(encoded_symname);
597         if (rc || !lower_dentry->d_inode)
598                 goto out_lock;
599         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
600         if (rc)
601                 goto out_lock;
602         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
603         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
604 out_lock:
605         unlock_dir(lower_dir_dentry);
606         dput(lower_dentry);
607         if (!dentry->d_inode)
608                 d_drop(dentry);
609         return rc;
610 }
611
612 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
613 {
614         int rc;
615         struct dentry *lower_dentry;
616         struct dentry *lower_dir_dentry;
617
618         lower_dentry = ecryptfs_dentry_to_lower(dentry);
619         lower_dir_dentry = lock_parent(lower_dentry);
620         rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
621         if (rc || !lower_dentry->d_inode)
622                 goto out;
623         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
624         if (rc)
625                 goto out;
626         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
627         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
628         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
629 out:
630         unlock_dir(lower_dir_dentry);
631         if (!dentry->d_inode)
632                 d_drop(dentry);
633         return rc;
634 }
635
636 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
637 {
638         struct dentry *lower_dentry;
639         struct dentry *lower_dir_dentry;
640         int rc;
641
642         lower_dentry = ecryptfs_dentry_to_lower(dentry);
643         dget(dentry);
644         lower_dir_dentry = lock_parent(lower_dentry);
645         dget(lower_dentry);
646         rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
647         dput(lower_dentry);
648         if (!rc)
649                 d_delete(lower_dentry);
650         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
651         dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
652         unlock_dir(lower_dir_dentry);
653         if (!rc)
654                 d_drop(dentry);
655         dput(dentry);
656         return rc;
657 }
658
659 static int
660 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
661 {
662         int rc;
663         struct dentry *lower_dentry;
664         struct dentry *lower_dir_dentry;
665
666         lower_dentry = ecryptfs_dentry_to_lower(dentry);
667         lower_dir_dentry = lock_parent(lower_dentry);
668         rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
669         if (rc || !lower_dentry->d_inode)
670                 goto out;
671         rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
672         if (rc)
673                 goto out;
674         fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
675         fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
676 out:
677         unlock_dir(lower_dir_dentry);
678         if (!dentry->d_inode)
679                 d_drop(dentry);
680         return rc;
681 }
682
683 static int
684 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
685                 struct inode *new_dir, struct dentry *new_dentry)
686 {
687         int rc;
688         struct dentry *lower_old_dentry;
689         struct dentry *lower_new_dentry;
690         struct dentry *lower_old_dir_dentry;
691         struct dentry *lower_new_dir_dentry;
692         struct dentry *trap = NULL;
693
694         lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
695         lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
696         dget(lower_old_dentry);
697         dget(lower_new_dentry);
698         lower_old_dir_dentry = dget_parent(lower_old_dentry);
699         lower_new_dir_dentry = dget_parent(lower_new_dentry);
700         trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
701         /* source should not be ancestor of target */
702         if (trap == lower_old_dentry) {
703                 rc = -EINVAL;
704                 goto out_lock;
705         }
706         /* target should not be ancestor of source */
707         if (trap == lower_new_dentry) {
708                 rc = -ENOTEMPTY;
709                 goto out_lock;
710         }
711         rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
712                         lower_new_dir_dentry->d_inode, lower_new_dentry);
713         if (rc)
714                 goto out_lock;
715         fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
716         if (new_dir != old_dir)
717                 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
718 out_lock:
719         unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
720         dput(lower_new_dentry->d_parent);
721         dput(lower_old_dentry->d_parent);
722         dput(lower_new_dentry);
723         dput(lower_old_dentry);
724         return rc;
725 }
726
727 static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
728                                    size_t *bufsiz)
729 {
730         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
731         char *lower_buf;
732         size_t lower_bufsiz = PATH_MAX;
733         mm_segment_t old_fs;
734         int rc;
735
736         lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
737         if (!lower_buf) {
738                 rc = -ENOMEM;
739                 goto out;
740         }
741         old_fs = get_fs();
742         set_fs(get_ds());
743         rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
744                                                    (char __user *)lower_buf,
745                                                    lower_bufsiz);
746         set_fs(old_fs);
747         if (rc < 0)
748                 goto out;
749         lower_bufsiz = rc;
750         rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
751                                                   lower_buf, lower_bufsiz);
752 out:
753         kfree(lower_buf);
754         return rc;
755 }
756
757 static int
758 ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
759 {
760         char *kbuf;
761         size_t kbufsiz, copied;
762         int rc;
763
764         rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
765         if (rc)
766                 goto out;
767         copied = min_t(size_t, bufsiz, kbufsiz);
768         rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
769         kfree(kbuf);
770         fsstack_copy_attr_atime(dentry->d_inode,
771                                 ecryptfs_dentry_to_lower(dentry)->d_inode);
772 out:
773         return rc;
774 }
775
776 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
777 {
778         char *buf;
779         int len = PAGE_SIZE, rc;
780         mm_segment_t old_fs;
781
782         /* Released in ecryptfs_put_link(); only release here on error */
783         buf = kmalloc(len, GFP_KERNEL);
784         if (!buf) {
785                 buf = ERR_PTR(-ENOMEM);
786                 goto out;
787         }
788         old_fs = get_fs();
789         set_fs(get_ds());
790         rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
791         set_fs(old_fs);
792         if (rc < 0) {
793                 kfree(buf);
794                 buf = ERR_PTR(rc);
795         } else
796                 buf[rc] = '\0';
797 out:
798         nd_set_link(nd, buf);
799         return NULL;
800 }
801
802 static void
803 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
804 {
805         char *buf = nd_get_link(nd);
806         if (!IS_ERR(buf)) {
807                 /* Free the char* */
808                 kfree(buf);
809         }
810 }
811
812 /**
813  * upper_size_to_lower_size
814  * @crypt_stat: Crypt_stat associated with file
815  * @upper_size: Size of the upper file
816  *
817  * Calculate the required size of the lower file based on the
818  * specified size of the upper file. This calculation is based on the
819  * number of headers in the underlying file and the extent size.
820  *
821  * Returns Calculated size of the lower file.
822  */
823 static loff_t
824 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
825                          loff_t upper_size)
826 {
827         loff_t lower_size;
828
829         lower_size = ecryptfs_lower_header_size(crypt_stat);
830         if (upper_size != 0) {
831                 loff_t num_extents;
832
833                 num_extents = upper_size >> crypt_stat->extent_shift;
834                 if (upper_size & ~crypt_stat->extent_mask)
835                         num_extents++;
836                 lower_size += (num_extents * crypt_stat->extent_size);
837         }
838         return lower_size;
839 }
840
841 /**
842  * truncate_upper
843  * @dentry: The ecryptfs layer dentry
844  * @ia: Address of the ecryptfs inode's attributes
845  * @lower_ia: Address of the lower inode's attributes
846  *
847  * Function to handle truncations modifying the size of the file. Note
848  * that the file sizes are interpolated. When expanding, we are simply
849  * writing strings of 0's out. When truncating, we truncate the upper
850  * inode and update the lower_ia according to the page index
851  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
852  * the caller must use lower_ia in a call to notify_change() to perform
853  * the truncation of the lower inode.
854  *
855  * Returns zero on success; non-zero otherwise
856  */
857 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
858                           struct iattr *lower_ia)
859 {
860         int rc = 0;
861         struct inode *inode = dentry->d_inode;
862         struct ecryptfs_crypt_stat *crypt_stat;
863         loff_t i_size = i_size_read(inode);
864         loff_t lower_size_before_truncate;
865         loff_t lower_size_after_truncate;
866
867         if (unlikely((ia->ia_size == i_size))) {
868                 lower_ia->ia_valid &= ~ATTR_SIZE;
869                 goto out;
870         }
871         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
872         /* Switch on growing or shrinking file */
873         if (ia->ia_size > i_size) {
874                 char zero[] = { 0x00 };
875
876                 lower_ia->ia_valid &= ~ATTR_SIZE;
877                 /* Write a single 0 at the last position of the file;
878                  * this triggers code that will fill in 0's throughout
879                  * the intermediate portion of the previous end of the
880                  * file and the new and of the file */
881                 rc = ecryptfs_write(inode, zero,
882                                     (ia->ia_size - 1), 1);
883         } else { /* ia->ia_size < i_size_read(inode) */
884                 /* We're chopping off all the pages down to the page
885                  * in which ia->ia_size is located. Fill in the end of
886                  * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
887                  * PAGE_CACHE_SIZE with zeros. */
888                 size_t num_zeros = (PAGE_CACHE_SIZE
889                                     - (ia->ia_size & ~PAGE_CACHE_MASK));
890
891
892                 /*
893                  * XXX(truncate) this should really happen at the begginning
894                  * of ->setattr.  But the code is too messy to that as part
895                  * of a larger patch.  ecryptfs is also totally missing out
896                  * on the inode_change_ok check at the beginning of
897                  * ->setattr while would include this.
898                  */
899                 rc = inode_newsize_ok(inode, ia->ia_size);
900                 if (rc)
901                         goto out;
902
903                 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
904                         truncate_setsize(inode, ia->ia_size);
905                         lower_ia->ia_size = ia->ia_size;
906                         lower_ia->ia_valid |= ATTR_SIZE;
907                         goto out;
908                 }
909                 if (num_zeros) {
910                         char *zeros_virt;
911
912                         zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
913                         if (!zeros_virt) {
914                                 rc = -ENOMEM;
915                                 goto out;
916                         }
917                         rc = ecryptfs_write(inode, zeros_virt,
918                                             ia->ia_size, num_zeros);
919                         kfree(zeros_virt);
920                         if (rc) {
921                                 printk(KERN_ERR "Error attempting to zero out "
922                                        "the remainder of the end page on "
923                                        "reducing truncate; rc = [%d]\n", rc);
924                                 goto out;
925                         }
926                 }
927                 truncate_setsize(inode, ia->ia_size);
928                 rc = ecryptfs_write_inode_size_to_metadata(inode);
929                 if (rc) {
930                         printk(KERN_ERR "Problem with "
931                                "ecryptfs_write_inode_size_to_metadata; "
932                                "rc = [%d]\n", rc);
933                         goto out;
934                 }
935                 /* We are reducing the size of the ecryptfs file, and need to
936                  * know if we need to reduce the size of the lower file. */
937                 lower_size_before_truncate =
938                     upper_size_to_lower_size(crypt_stat, i_size);
939                 lower_size_after_truncate =
940                     upper_size_to_lower_size(crypt_stat, ia->ia_size);
941                 if (lower_size_after_truncate < lower_size_before_truncate) {
942                         lower_ia->ia_size = lower_size_after_truncate;
943                         lower_ia->ia_valid |= ATTR_SIZE;
944                 } else
945                         lower_ia->ia_valid &= ~ATTR_SIZE;
946         }
947 out:
948         return rc;
949 }
950
951 /**
952  * ecryptfs_truncate
953  * @dentry: The ecryptfs layer dentry
954  * @new_length: The length to expand the file to
955  *
956  * Simple function that handles the truncation of an eCryptfs inode and
957  * its corresponding lower inode.
958  *
959  * Returns zero on success; non-zero otherwise
960  */
961 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
962 {
963         struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
964         struct iattr lower_ia = { .ia_valid = 0 };
965         int rc;
966
967         rc = truncate_upper(dentry, &ia, &lower_ia);
968         if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
969                 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
970
971                 mutex_lock(&lower_dentry->d_inode->i_mutex);
972                 rc = notify_change(lower_dentry, &lower_ia);
973                 mutex_unlock(&lower_dentry->d_inode->i_mutex);
974         }
975         return rc;
976 }
977
978 static int
979 ecryptfs_permission(struct inode *inode, int mask)
980 {
981         return inode_permission(ecryptfs_inode_to_lower(inode), mask);
982 }
983
984 /**
985  * ecryptfs_setattr
986  * @dentry: dentry handle to the inode to modify
987  * @ia: Structure with flags of what to change and values
988  *
989  * Updates the metadata of an inode. If the update is to the size
990  * i.e. truncation, then ecryptfs_truncate will handle the size modification
991  * of both the ecryptfs inode and the lower inode.
992  *
993  * All other metadata changes will be passed right to the lower filesystem,
994  * and we will just update our inode to look like the lower.
995  */
996 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
997 {
998         int rc = 0;
999         struct dentry *lower_dentry;
1000         struct iattr lower_ia;
1001         struct inode *inode;
1002         struct inode *lower_inode;
1003         struct ecryptfs_crypt_stat *crypt_stat;
1004
1005         crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
1006         if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
1007                 ecryptfs_init_crypt_stat(crypt_stat);
1008         inode = dentry->d_inode;
1009         lower_inode = ecryptfs_inode_to_lower(inode);
1010         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1011         mutex_lock(&crypt_stat->cs_mutex);
1012         if (S_ISDIR(dentry->d_inode->i_mode))
1013                 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
1014         else if (S_ISREG(dentry->d_inode->i_mode)
1015                  && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
1016                      || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
1017                 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1018
1019                 mount_crypt_stat = &ecryptfs_superblock_to_private(
1020                         dentry->d_sb)->mount_crypt_stat;
1021                 rc = ecryptfs_read_metadata(dentry);
1022                 if (rc) {
1023                         if (!(mount_crypt_stat->flags
1024                               & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
1025                                 rc = -EIO;
1026                                 printk(KERN_WARNING "Either the lower file "
1027                                        "is not in a valid eCryptfs format, "
1028                                        "or the key could not be retrieved. "
1029                                        "Plaintext passthrough mode is not "
1030                                        "enabled; returning -EIO\n");
1031                                 mutex_unlock(&crypt_stat->cs_mutex);
1032                                 goto out;
1033                         }
1034                         rc = 0;
1035                         crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
1036                 }
1037         }
1038         mutex_unlock(&crypt_stat->cs_mutex);
1039         memcpy(&lower_ia, ia, sizeof(lower_ia));
1040         if (ia->ia_valid & ATTR_FILE)
1041                 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
1042         if (ia->ia_valid & ATTR_SIZE) {
1043                 rc = truncate_upper(dentry, ia, &lower_ia);
1044                 if (rc < 0)
1045                         goto out;
1046         }
1047
1048         /*
1049          * mode change is for clearing setuid/setgid bits. Allow lower fs
1050          * to interpret this in its own way.
1051          */
1052         if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1053                 lower_ia.ia_valid &= ~ATTR_MODE;
1054
1055         mutex_lock(&lower_dentry->d_inode->i_mutex);
1056         rc = notify_change(lower_dentry, &lower_ia);
1057         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1058 out:
1059         fsstack_copy_attr_all(inode, lower_inode);
1060         return rc;
1061 }
1062
1063 int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1064                           struct kstat *stat)
1065 {
1066         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1067         int rc = 0;
1068
1069         mount_crypt_stat = &ecryptfs_superblock_to_private(
1070                                                 dentry->d_sb)->mount_crypt_stat;
1071         generic_fillattr(dentry->d_inode, stat);
1072         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1073                 char *target;
1074                 size_t targetsiz;
1075
1076                 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1077                 if (!rc) {
1078                         kfree(target);
1079                         stat->size = targetsiz;
1080                 }
1081         }
1082         return rc;
1083 }
1084
1085 int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1086                      struct kstat *stat)
1087 {
1088         struct kstat lower_stat;
1089         int rc;
1090
1091         rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1092                          ecryptfs_dentry_to_lower(dentry), &lower_stat);
1093         if (!rc) {
1094                 generic_fillattr(dentry->d_inode, stat);
1095                 stat->blocks = lower_stat.blocks;
1096         }
1097         return rc;
1098 }
1099
1100 int
1101 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1102                   size_t size, int flags)
1103 {
1104         int rc = 0;
1105         struct dentry *lower_dentry;
1106
1107         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1108         if (!lower_dentry->d_inode->i_op->setxattr) {
1109                 rc = -EOPNOTSUPP;
1110                 goto out;
1111         }
1112
1113         rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1114 out:
1115         return rc;
1116 }
1117
1118 ssize_t
1119 ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1120                         void *value, size_t size)
1121 {
1122         int rc = 0;
1123
1124         if (!lower_dentry->d_inode->i_op->getxattr) {
1125                 rc = -EOPNOTSUPP;
1126                 goto out;
1127         }
1128         mutex_lock(&lower_dentry->d_inode->i_mutex);
1129         rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1130                                                    size);
1131         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1132 out:
1133         return rc;
1134 }
1135
1136 static ssize_t
1137 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1138                   size_t size)
1139 {
1140         return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1141                                        value, size);
1142 }
1143
1144 static ssize_t
1145 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1146 {
1147         int rc = 0;
1148         struct dentry *lower_dentry;
1149
1150         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1151         if (!lower_dentry->d_inode->i_op->listxattr) {
1152                 rc = -EOPNOTSUPP;
1153                 goto out;
1154         }
1155         mutex_lock(&lower_dentry->d_inode->i_mutex);
1156         rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1157         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1158 out:
1159         return rc;
1160 }
1161
1162 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1163 {
1164         int rc = 0;
1165         struct dentry *lower_dentry;
1166
1167         lower_dentry = ecryptfs_dentry_to_lower(dentry);
1168         if (!lower_dentry->d_inode->i_op->removexattr) {
1169                 rc = -EOPNOTSUPP;
1170                 goto out;
1171         }
1172         mutex_lock(&lower_dentry->d_inode->i_mutex);
1173         rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1174         mutex_unlock(&lower_dentry->d_inode->i_mutex);
1175 out:
1176         return rc;
1177 }
1178
1179 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
1180 {
1181         if ((ecryptfs_inode_to_lower(inode)
1182              == (struct inode *)candidate_lower_inode))
1183                 return 1;
1184         else
1185                 return 0;
1186 }
1187
1188 int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
1189 {
1190         ecryptfs_init_inode(inode, (struct inode *)lower_inode);
1191         return 0;
1192 }
1193
1194 const struct inode_operations ecryptfs_symlink_iops = {
1195         .readlink = ecryptfs_readlink,
1196         .follow_link = ecryptfs_follow_link,
1197         .put_link = ecryptfs_put_link,
1198         .permission = ecryptfs_permission,
1199         .setattr = ecryptfs_setattr,
1200         .getattr = ecryptfs_getattr_link,
1201         .setxattr = ecryptfs_setxattr,
1202         .getxattr = ecryptfs_getxattr,
1203         .listxattr = ecryptfs_listxattr,
1204         .removexattr = ecryptfs_removexattr
1205 };
1206
1207 const struct inode_operations ecryptfs_dir_iops = {
1208         .create = ecryptfs_create,
1209         .lookup = ecryptfs_lookup,
1210         .link = ecryptfs_link,
1211         .unlink = ecryptfs_unlink,
1212         .symlink = ecryptfs_symlink,
1213         .mkdir = ecryptfs_mkdir,
1214         .rmdir = ecryptfs_rmdir,
1215         .mknod = ecryptfs_mknod,
1216         .rename = ecryptfs_rename,
1217         .permission = ecryptfs_permission,
1218         .setattr = ecryptfs_setattr,
1219         .setxattr = ecryptfs_setxattr,
1220         .getxattr = ecryptfs_getxattr,
1221         .listxattr = ecryptfs_listxattr,
1222         .removexattr = ecryptfs_removexattr
1223 };
1224
1225 const struct inode_operations ecryptfs_main_iops = {
1226         .permission = ecryptfs_permission,
1227         .setattr = ecryptfs_setattr,
1228         .getattr = ecryptfs_getattr,
1229         .setxattr = ecryptfs_setxattr,
1230         .getxattr = ecryptfs_getxattr,
1231         .listxattr = ecryptfs_listxattr,
1232         .removexattr = ecryptfs_removexattr
1233 };