blob: e2e47ba5d313a5f2aca58589e08d2d3df969bed2 [file] [log] [blame]
Michael Halcrow237fead2006-10-04 02:16:22 -07001/**
2 * eCryptfs: Linux filesystem encryption layer
3 *
4 * Copyright (C) 1997-2004 Erez Zadok
5 * Copyright (C) 2001-2004 Stony Brook University
Michael Halcrowdd2a3b72007-02-12 00:53:46 -08006 * Copyright (C) 2004-2007 International Business Machines Corp.
Michael Halcrow237fead2006-10-04 02:16:22 -07007 * 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>
Josef "Jeff" Sipek0cc72dc2006-12-08 02:36:31 -080033#include <linux/fs_stack.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090034#include <linux/slab.h>
Roberto Sassu48b512e2010-10-05 18:53:45 +020035#include <linux/xattr.h>
Harvey Harrison0a688ad2008-07-23 21:30:07 -070036#include <asm/unaligned.h>
Michael Halcrow237fead2006-10-04 02:16:22 -070037#include "ecryptfs_kernel.h"
38
39static struct dentry *lock_parent(struct dentry *dentry)
40{
41 struct dentry *dir;
42
Miklos Szeredi8dc4e372008-05-12 14:02:04 -070043 dir = dget_parent(dentry);
David Howells2b0143b2015-03-17 22:25:59 +000044 mutex_lock_nested(&(d_inode(dir)->i_mutex), I_MUTEX_PARENT);
Michael Halcrow237fead2006-10-04 02:16:22 -070045 return dir;
46}
47
Michael Halcrow237fead2006-10-04 02:16:22 -070048static void unlock_dir(struct dentry *dir)
49{
David Howells2b0143b2015-03-17 22:25:59 +000050 mutex_unlock(&d_inode(dir)->i_mutex);
Michael Halcrow237fead2006-10-04 02:16:22 -070051 dput(dir);
52}
53
Tyler Hicksc4f79072011-05-23 21:18:20 -050054static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
55{
Himangi Saraogic4cf3ba2014-06-27 01:11:59 +053056 return ecryptfs_inode_to_lower(inode) == lower_inode;
Tyler Hicksc4f79072011-05-23 21:18:20 -050057}
58
Tyler Hicks5ccf9202011-05-24 02:16:51 -050059static int ecryptfs_inode_set(struct inode *inode, void *opaque)
Tyler Hicksc4f79072011-05-23 21:18:20 -050060{
Tyler Hicks5ccf9202011-05-24 02:16:51 -050061 struct inode *lower_inode = opaque;
62
63 ecryptfs_set_inode_lower(inode, lower_inode);
64 fsstack_copy_attr_all(inode, lower_inode);
65 /* i_size will be overwritten for encrypted regular files */
66 fsstack_copy_inode_size(inode, lower_inode);
67 inode->i_ino = lower_inode->i_ino;
Tyler Hicksc4f79072011-05-23 21:18:20 -050068 inode->i_version++;
Tyler Hicksc4f79072011-05-23 21:18:20 -050069 inode->i_mapping->a_ops = &ecryptfs_aops;
Tyler Hicks5ccf9202011-05-24 02:16:51 -050070
71 if (S_ISLNK(inode->i_mode))
72 inode->i_op = &ecryptfs_symlink_iops;
73 else if (S_ISDIR(inode->i_mode))
74 inode->i_op = &ecryptfs_dir_iops;
75 else
76 inode->i_op = &ecryptfs_main_iops;
77
78 if (S_ISDIR(inode->i_mode))
79 inode->i_fop = &ecryptfs_dir_fops;
80 else if (special_file(inode->i_mode))
81 init_special_inode(inode, inode->i_mode, inode->i_rdev);
82 else
83 inode->i_fop = &ecryptfs_main_fops;
84
Tyler Hicksc4f79072011-05-23 21:18:20 -050085 return 0;
86}
87
Tyler Hicks5ccf9202011-05-24 02:16:51 -050088static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
89 struct super_block *sb)
90{
91 struct inode *inode;
92
93 if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
94 return ERR_PTR(-EXDEV);
95 if (!igrab(lower_inode))
96 return ERR_PTR(-ESTALE);
97 inode = iget5_locked(sb, (unsigned long)lower_inode,
98 ecryptfs_inode_test, ecryptfs_inode_set,
99 lower_inode);
100 if (!inode) {
101 iput(lower_inode);
102 return ERR_PTR(-EACCES);
103 }
104 if (!(inode->i_state & I_NEW))
105 iput(lower_inode);
106
107 return inode;
108}
109
Tyler Hicksc4f79072011-05-23 21:18:20 -0500110struct inode *ecryptfs_get_inode(struct inode *lower_inode,
111 struct super_block *sb)
112{
Tyler Hicks5ccf9202011-05-24 02:16:51 -0500113 struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
Tyler Hicksc4f79072011-05-23 21:18:20 -0500114
Tyler Hicks5ccf9202011-05-24 02:16:51 -0500115 if (!IS_ERR(inode) && (inode->i_state & I_NEW))
Tyler Hicksc4f79072011-05-23 21:18:20 -0500116 unlock_new_inode(inode);
Tyler Hicks5ccf9202011-05-24 02:16:51 -0500117
Tyler Hicksc4f79072011-05-23 21:18:20 -0500118 return inode;
Tyler Hicksc4f79072011-05-23 21:18:20 -0500119}
120
Tyler Hicksc4f79072011-05-23 21:18:20 -0500121/**
122 * ecryptfs_interpose
123 * @lower_dentry: Existing dentry in the lower filesystem
124 * @dentry: ecryptfs' dentry
125 * @sb: ecryptfs's super_block
Tyler Hicksc4f79072011-05-23 21:18:20 -0500126 *
127 * Interposes upper and lower dentries.
128 *
129 * Returns zero on success; non-zero otherwise
130 */
131static int ecryptfs_interpose(struct dentry *lower_dentry,
Tyler Hicks5ccf9202011-05-24 02:16:51 -0500132 struct dentry *dentry, struct super_block *sb)
Tyler Hicksc4f79072011-05-23 21:18:20 -0500133{
David Howells2b0143b2015-03-17 22:25:59 +0000134 struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb);
Tyler Hicks5ccf9202011-05-24 02:16:51 -0500135
Tyler Hicksc4f79072011-05-23 21:18:20 -0500136 if (IS_ERR(inode))
137 return PTR_ERR(inode);
Tyler Hicks5ccf9202011-05-24 02:16:51 -0500138 d_instantiate(dentry, inode);
139
Tyler Hicksc4f79072011-05-23 21:18:20 -0500140 return 0;
141}
142
Tyler Hicks8bc2d3c2012-05-22 15:09:50 -0500143static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry,
144 struct inode *inode)
145{
146 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
147 struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
148 struct dentry *lower_dir_dentry;
149 int rc;
150
151 dget(lower_dentry);
152 lower_dir_dentry = lock_parent(lower_dentry);
J. Bruce Fieldsb21996e2011-09-20 09:14:34 -0400153 rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL);
Tyler Hicks8bc2d3c2012-05-22 15:09:50 -0500154 if (rc) {
155 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
156 goto out_unlock;
157 }
158 fsstack_copy_attr_times(dir, lower_dir_inode);
159 set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink);
160 inode->i_ctime = dir->i_ctime;
161 d_drop(dentry);
162out_unlock:
163 unlock_dir(lower_dir_dentry);
164 dput(lower_dentry);
165 return rc;
166}
167
Michael Halcrow237fead2006-10-04 02:16:22 -0700168/**
Michael Halcrow237fead2006-10-04 02:16:22 -0700169 * ecryptfs_do_create
170 * @directory_inode: inode of the new file's dentry's parent in ecryptfs
171 * @ecryptfs_dentry: New file's dentry in ecryptfs
172 * @mode: The mode of the new file
Michael Halcrow237fead2006-10-04 02:16:22 -0700173 *
174 * Creates the underlying file and the eCryptfs inode which will link to
175 * it. It will also update the eCryptfs directory inode to mimic the
176 * stat of the lower directory inode.
177 *
Tyler Hicksb59db432011-11-21 17:31:02 -0600178 * Returns the new eCryptfs inode on success; an ERR_PTR on error condition
Michael Halcrow237fead2006-10-04 02:16:22 -0700179 */
Tyler Hicksb59db432011-11-21 17:31:02 -0600180static struct inode *
Michael Halcrow237fead2006-10-04 02:16:22 -0700181ecryptfs_do_create(struct inode *directory_inode,
Al Viro175a4eb2011-07-26 03:30:54 -0400182 struct dentry *ecryptfs_dentry, umode_t mode)
Michael Halcrow237fead2006-10-04 02:16:22 -0700183{
184 int rc;
185 struct dentry *lower_dentry;
186 struct dentry *lower_dir_dentry;
Tyler Hicksb59db432011-11-21 17:31:02 -0600187 struct inode *inode;
Michael Halcrow237fead2006-10-04 02:16:22 -0700188
189 lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
190 lower_dir_dentry = lock_parent(lower_dentry);
David Howells2b0143b2015-03-17 22:25:59 +0000191 rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true);
Michael Halcrow4981e082007-10-16 01:28:09 -0700192 if (rc) {
Michael Halcrowcaeeeec2008-01-08 15:33:02 -0800193 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
Harvey Harrison18d1dbf2008-04-29 00:59:48 -0700194 "rc = [%d]\n", __func__, rc);
Tyler Hicksb59db432011-11-21 17:31:02 -0600195 inode = ERR_PTR(rc);
Michael Halcrowcaeeeec2008-01-08 15:33:02 -0800196 goto out_lock;
Michael Halcrow237fead2006-10-04 02:16:22 -0700197 }
David Howells2b0143b2015-03-17 22:25:59 +0000198 inode = __ecryptfs_get_inode(d_inode(lower_dentry),
Tyler Hicksb59db432011-11-21 17:31:02 -0600199 directory_inode->i_sb);
Tyler Hicks8bc2d3c2012-05-22 15:09:50 -0500200 if (IS_ERR(inode)) {
David Howells2b0143b2015-03-17 22:25:59 +0000201 vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL);
Michael Halcrow237fead2006-10-04 02:16:22 -0700202 goto out_lock;
Tyler Hicks8bc2d3c2012-05-22 15:09:50 -0500203 }
David Howells2b0143b2015-03-17 22:25:59 +0000204 fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry));
205 fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry));
Michael Halcrow237fead2006-10-04 02:16:22 -0700206out_lock:
207 unlock_dir(lower_dir_dentry);
Tyler Hicksb59db432011-11-21 17:31:02 -0600208 return inode;
Michael Halcrow237fead2006-10-04 02:16:22 -0700209}
210
211/**
Michael Halcrow237fead2006-10-04 02:16:22 -0700212 * ecryptfs_initialize_file
213 *
214 * Cause the file to be changed from a basic empty file to an ecryptfs
215 * file with a header and first data page.
216 *
217 * Returns zero on success
218 */
Tyler Hickse3ccaa92012-06-20 23:50:59 -0700219int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
220 struct inode *ecryptfs_inode)
Michael Halcrow237fead2006-10-04 02:16:22 -0700221{
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -0700222 struct ecryptfs_crypt_stat *crypt_stat =
Tyler Hicksb59db432011-11-21 17:31:02 -0600223 &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
Michael Halcrow237fead2006-10-04 02:16:22 -0700224 int rc = 0;
Michael Halcrow237fead2006-10-04 02:16:22 -0700225
Tyler Hicksb59db432011-11-21 17:31:02 -0600226 if (S_ISDIR(ecryptfs_inode->i_mode)) {
Michael Halcrow237fead2006-10-04 02:16:22 -0700227 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
Michael Halcrowe2bd99e2007-02-12 00:53:49 -0800228 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -0700229 goto out;
Michael Halcrow237fead2006-10-04 02:16:22 -0700230 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700231 ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
Tyler Hicksb59db432011-11-21 17:31:02 -0600232 rc = ecryptfs_new_file_context(ecryptfs_inode);
Michael Halcrow237fead2006-10-04 02:16:22 -0700233 if (rc) {
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -0700234 ecryptfs_printk(KERN_ERR, "Error creating new file "
235 "context; rc = [%d]\n", rc);
236 goto out;
Michael Halcrow237fead2006-10-04 02:16:22 -0700237 }
Tyler Hicksb59db432011-11-21 17:31:02 -0600238 rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode);
Roberto Sassu27992892010-11-03 11:11:28 +0100239 if (rc) {
240 printk(KERN_ERR "%s: Error attempting to initialize "
Tyler Hicks332ab162011-04-14 15:35:11 -0500241 "the lower file for the dentry with name "
David Howells9e78d142013-12-10 15:26:48 +0000242 "[%pd]; rc = [%d]\n", __func__,
243 ecryptfs_dentry, rc);
Roberto Sassu27992892010-11-03 11:11:28 +0100244 goto out;
Michael Halcrow391b52f2008-07-23 21:30:08 -0700245 }
Tyler Hicksb59db432011-11-21 17:31:02 -0600246 rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode);
Tyler Hicks332ab162011-04-14 15:35:11 -0500247 if (rc)
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -0700248 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
Tyler Hicksb59db432011-11-21 17:31:02 -0600249 ecryptfs_put_lower_file(ecryptfs_inode);
Michael Halcrow237fead2006-10-04 02:16:22 -0700250out:
251 return rc;
252}
253
254/**
255 * ecryptfs_create
256 * @dir: The inode of the directory in which to create the file.
257 * @dentry: The eCryptfs dentry
258 * @mode: The mode of the new file.
Michael Halcrow237fead2006-10-04 02:16:22 -0700259 *
260 * Creates a new file.
261 *
262 * Returns zero on success; non-zero on error condition
263 */
264static int
265ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
Al Viroebfc3b42012-06-10 18:05:36 -0400266 umode_t mode, bool excl)
Michael Halcrow237fead2006-10-04 02:16:22 -0700267{
Tyler Hicksb59db432011-11-21 17:31:02 -0600268 struct inode *ecryptfs_inode;
Michael Halcrow237fead2006-10-04 02:16:22 -0700269 int rc;
270
Tyler Hicksb59db432011-11-21 17:31:02 -0600271 ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry,
272 mode);
Viresh Kumara1c83682015-08-12 15:59:44 +0530273 if (IS_ERR(ecryptfs_inode)) {
Michael Halcrow237fead2006-10-04 02:16:22 -0700274 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
275 "lower filesystem\n");
Tyler Hicksb59db432011-11-21 17:31:02 -0600276 rc = PTR_ERR(ecryptfs_inode);
Michael Halcrow237fead2006-10-04 02:16:22 -0700277 goto out;
278 }
279 /* At this point, a file exists on "disk"; we need to make sure
280 * that this on disk file is prepared to be an ecryptfs file */
Tyler Hicksb59db432011-11-21 17:31:02 -0600281 rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode);
282 if (rc) {
Tyler Hicks8bc2d3c2012-05-22 15:09:50 -0500283 ecryptfs_do_unlink(directory_inode, ecryptfs_dentry,
284 ecryptfs_inode);
285 make_bad_inode(ecryptfs_inode);
Tyler Hicksb59db432011-11-21 17:31:02 -0600286 unlock_new_inode(ecryptfs_inode);
287 iput(ecryptfs_inode);
288 goto out;
289 }
Tyler Hicksb59db432011-11-21 17:31:02 -0600290 unlock_new_inode(ecryptfs_inode);
Al Viro8fc37ec2012-07-19 09:18:15 +0400291 d_instantiate(ecryptfs_dentry, ecryptfs_inode);
Michael Halcrow237fead2006-10-04 02:16:22 -0700292out:
293 return rc;
294}
295
Tyler Hicks778aeb42011-05-24 04:56:23 -0500296static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
Michael Halcrow237fead2006-10-04 02:16:22 -0700297{
Tyler Hicks2aac0cf2009-03-20 02:23:57 -0500298 struct ecryptfs_crypt_stat *crypt_stat;
Tyler Hicks778aeb42011-05-24 04:56:23 -0500299 int rc;
Michael Halcrow237fead2006-10-04 02:16:22 -0700300
Tyler Hicks778aeb42011-05-24 04:56:23 -0500301 rc = ecryptfs_get_lower_file(dentry, inode);
Roberto Sassu27992892010-11-03 11:11:28 +0100302 if (rc) {
303 printk(KERN_ERR "%s: Error attempting to initialize "
Tyler Hicks332ab162011-04-14 15:35:11 -0500304 "the lower file for the dentry with name "
David Howells9e78d142013-12-10 15:26:48 +0000305 "[%pd]; rc = [%d]\n", __func__,
306 dentry, rc);
Tyler Hicks778aeb42011-05-24 04:56:23 -0500307 return rc;
Michael Halcrow391b52f2008-07-23 21:30:08 -0700308 }
Tyler Hicks778aeb42011-05-24 04:56:23 -0500309
Tyler Hicks3b06b3e2011-05-24 03:49:02 -0500310 crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
Tyler Hicks2aac0cf2009-03-20 02:23:57 -0500311 /* TODO: lock for crypt_stat comparison */
312 if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
Tyler Hicks778aeb42011-05-24 04:56:23 -0500313 ecryptfs_set_default_sizes(crypt_stat);
314
315 rc = ecryptfs_read_and_validate_header_region(inode);
316 ecryptfs_put_lower_file(inode);
Michael Halcrow237fead2006-10-04 02:16:22 -0700317 if (rc) {
Tyler Hicks778aeb42011-05-24 04:56:23 -0500318 rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
319 if (!rc)
320 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
Michael Halcrow237fead2006-10-04 02:16:22 -0700321 }
Tyler Hicks778aeb42011-05-24 04:56:23 -0500322
323 /* Must return 0 to allow non-eCryptfs files to be looked up, too */
324 return 0;
325}
326
327/**
328 * ecryptfs_lookup_interpose - Dentry interposition for a lookup
329 */
330static int ecryptfs_lookup_interpose(struct dentry *dentry,
331 struct dentry *lower_dentry,
332 struct inode *dir_inode)
333{
David Howells2b0143b2015-03-17 22:25:59 +0000334 struct inode *inode, *lower_inode = d_inode(lower_dentry);
Tyler Hicks778aeb42011-05-24 04:56:23 -0500335 struct ecryptfs_dentry_info *dentry_info;
336 struct vfsmount *lower_mnt;
337 int rc = 0;
338
Tyler Hicks778aeb42011-05-24 04:56:23 -0500339 dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
Tyler Hicks778aeb42011-05-24 04:56:23 -0500340 if (!dentry_info) {
341 printk(KERN_ERR "%s: Out of memory whilst attempting "
342 "to allocate ecryptfs_dentry_info struct\n",
343 __func__);
344 dput(lower_dentry);
Tyler Hicks778aeb42011-05-24 04:56:23 -0500345 return -ENOMEM;
346 }
Al Viro0b1d9012012-07-20 12:09:19 +0400347
348 lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
David Howells2b0143b2015-03-17 22:25:59 +0000349 fsstack_copy_attr_atime(dir_inode, d_inode(lower_dentry->d_parent));
Al Viro84d08fa2013-07-05 18:59:33 +0400350 BUG_ON(!d_count(lower_dentry));
Al Viro0b1d9012012-07-20 12:09:19 +0400351
352 ecryptfs_set_dentry_private(dentry, dentry_info);
Al Viro92dd1232013-09-15 20:50:13 -0400353 dentry_info->lower_path.mnt = lower_mnt;
354 dentry_info->lower_path.dentry = lower_dentry;
Tyler Hicks778aeb42011-05-24 04:56:23 -0500355
David Howells2b0143b2015-03-17 22:25:59 +0000356 if (d_really_is_negative(lower_dentry)) {
Tyler Hicks778aeb42011-05-24 04:56:23 -0500357 /* We want to add because we couldn't find in lower */
358 d_add(dentry, NULL);
359 return 0;
360 }
361 inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb);
362 if (IS_ERR(inode)) {
363 printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
364 __func__, PTR_ERR(inode));
365 return PTR_ERR(inode);
366 }
367 if (S_ISREG(inode->i_mode)) {
368 rc = ecryptfs_i_size_read(dentry, inode);
369 if (rc) {
370 make_bad_inode(inode);
371 return rc;
372 }
373 }
374
Tyler Hicks3b06b3e2011-05-24 03:49:02 -0500375 if (inode->i_state & I_NEW)
376 unlock_new_inode(inode);
Tyler Hicks778aeb42011-05-24 04:56:23 -0500377 d_add(dentry, inode);
378
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800379 return rc;
380}
381
382/**
383 * ecryptfs_lookup
384 * @ecryptfs_dir_inode: The eCryptfs directory inode
385 * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
Al Viro89076bc2015-05-12 08:29:38 -0400386 * @flags: lookup flags
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800387 *
388 * Find a file on disk. If the file does not exist, then we'll add it to the
389 * dentry cache and continue on to read it from the disk.
390 */
391static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
392 struct dentry *ecryptfs_dentry,
Al Viro00cd8dd2012-06-10 17:13:09 -0400393 unsigned int flags)
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800394{
395 char *encrypted_and_encoded_name = NULL;
Michael Halcrowa8f12862009-01-06 14:42:03 -0800396 size_t encrypted_and_encoded_name_size;
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800397 struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800398 struct dentry *lower_dir_dentry, *lower_dentry;
399 int rc = 0;
400
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800401 lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
David Howells2b0143b2015-03-17 22:25:59 +0000402 mutex_lock(&d_inode(lower_dir_dentry)->i_mutex);
Tyler Hicks8787c7a2011-02-17 18:51:24 -0600403 lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
404 lower_dir_dentry,
405 ecryptfs_dentry->d_name.len);
David Howells2b0143b2015-03-17 22:25:59 +0000406 mutex_unlock(&d_inode(lower_dir_dentry)->i_mutex);
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800407 if (IS_ERR(lower_dentry)) {
408 rc = PTR_ERR(lower_dentry);
Tyler Hicks8787c7a2011-02-17 18:51:24 -0600409 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
David Howells9e78d142013-12-10 15:26:48 +0000410 "[%d] on lower_dentry = [%pd]\n", __func__, rc,
411 ecryptfs_dentry);
Al Virobc65a122012-07-20 12:03:41 +0400412 goto out;
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800413 }
David Howells2b0143b2015-03-17 22:25:59 +0000414 if (d_really_is_positive(lower_dentry))
Tyler Hicks5ccf9202011-05-24 02:16:51 -0500415 goto interpose;
Tyler Hicks2aac0cf2009-03-20 02:23:57 -0500416 mount_crypt_stat = &ecryptfs_superblock_to_private(
417 ecryptfs_dentry->d_sb)->mount_crypt_stat;
418 if (!(mount_crypt_stat
419 && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
Tyler Hicks5ccf9202011-05-24 02:16:51 -0500420 goto interpose;
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800421 dput(lower_dentry);
422 rc = ecryptfs_encrypt_and_encode_filename(
423 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
Tyler Hicks2aac0cf2009-03-20 02:23:57 -0500424 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800425 ecryptfs_dentry->d_name.len);
426 if (rc) {
427 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
428 "filename; rc = [%d]\n", __func__, rc);
Al Virobc65a122012-07-20 12:03:41 +0400429 goto out;
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800430 }
David Howells2b0143b2015-03-17 22:25:59 +0000431 mutex_lock(&d_inode(lower_dir_dentry)->i_mutex);
Tyler Hicks8787c7a2011-02-17 18:51:24 -0600432 lower_dentry = lookup_one_len(encrypted_and_encoded_name,
433 lower_dir_dentry,
434 encrypted_and_encoded_name_size);
David Howells2b0143b2015-03-17 22:25:59 +0000435 mutex_unlock(&d_inode(lower_dir_dentry)->i_mutex);
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800436 if (IS_ERR(lower_dentry)) {
437 rc = PTR_ERR(lower_dentry);
Tyler Hicks8787c7a2011-02-17 18:51:24 -0600438 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
Tyler Hicks9f376222010-03-25 11:16:56 -0500439 "[%d] on lower_dentry = [%s]\n", __func__, rc,
440 encrypted_and_encoded_name);
Al Virobc65a122012-07-20 12:03:41 +0400441 goto out;
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800442 }
Tyler Hicks5ccf9202011-05-24 02:16:51 -0500443interpose:
444 rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
445 ecryptfs_dir_inode);
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800446out:
447 kfree(encrypted_and_encoded_name);
Michael Halcrow237fead2006-10-04 02:16:22 -0700448 return ERR_PTR(rc);
449}
450
451static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
452 struct dentry *new_dentry)
453{
454 struct dentry *lower_old_dentry;
455 struct dentry *lower_new_dentry;
456 struct dentry *lower_dir_dentry;
457 u64 file_size_save;
458 int rc;
459
David Howells2b0143b2015-03-17 22:25:59 +0000460 file_size_save = i_size_read(d_inode(old_dentry));
Michael Halcrow237fead2006-10-04 02:16:22 -0700461 lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
462 lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
463 dget(lower_old_dentry);
464 dget(lower_new_dentry);
465 lower_dir_dentry = lock_parent(lower_new_dentry);
David Howells2b0143b2015-03-17 22:25:59 +0000466 rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry),
J. Bruce Fields146a8592011-09-20 17:14:31 -0400467 lower_new_dentry, NULL);
David Howells2b0143b2015-03-17 22:25:59 +0000468 if (rc || d_really_is_negative(lower_new_dentry))
Michael Halcrow237fead2006-10-04 02:16:22 -0700469 goto out_lock;
Tyler Hicks5ccf9202011-05-24 02:16:51 -0500470 rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
Michael Halcrow237fead2006-10-04 02:16:22 -0700471 if (rc)
472 goto out_lock;
David Howells2b0143b2015-03-17 22:25:59 +0000473 fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
474 fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
475 set_nlink(d_inode(old_dentry),
476 ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink);
477 i_size_write(d_inode(new_dentry), file_size_save);
Michael Halcrow237fead2006-10-04 02:16:22 -0700478out_lock:
479 unlock_dir(lower_dir_dentry);
480 dput(lower_new_dentry);
481 dput(lower_old_dentry);
Michael Halcrow237fead2006-10-04 02:16:22 -0700482 return rc;
483}
484
485static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
486{
David Howells2b0143b2015-03-17 22:25:59 +0000487 return ecryptfs_do_unlink(dir, dentry, d_inode(dentry));
Michael Halcrow237fead2006-10-04 02:16:22 -0700488}
489
490static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
491 const char *symname)
492{
493 int rc;
494 struct dentry *lower_dentry;
495 struct dentry *lower_dir_dentry;
Michael Halcrow237fead2006-10-04 02:16:22 -0700496 char *encoded_symname;
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800497 size_t encoded_symlen;
498 struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
Michael Halcrow237fead2006-10-04 02:16:22 -0700499
500 lower_dentry = ecryptfs_dentry_to_lower(dentry);
501 dget(lower_dentry);
502 lower_dir_dentry = lock_parent(lower_dentry);
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800503 mount_crypt_stat = &ecryptfs_superblock_to_private(
504 dir->i_sb)->mount_crypt_stat;
505 rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
506 &encoded_symlen,
507 NULL,
508 mount_crypt_stat, symname,
509 strlen(symname));
510 if (rc)
Michael Halcrow237fead2006-10-04 02:16:22 -0700511 goto out_lock;
David Howells2b0143b2015-03-17 22:25:59 +0000512 rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry,
Miklos Szeredidb2e7472008-06-24 16:50:16 +0200513 encoded_symname);
Michael Halcrow237fead2006-10-04 02:16:22 -0700514 kfree(encoded_symname);
David Howells2b0143b2015-03-17 22:25:59 +0000515 if (rc || d_really_is_negative(lower_dentry))
Michael Halcrow237fead2006-10-04 02:16:22 -0700516 goto out_lock;
Tyler Hicks5ccf9202011-05-24 02:16:51 -0500517 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
Michael Halcrow237fead2006-10-04 02:16:22 -0700518 if (rc)
519 goto out_lock;
David Howells2b0143b2015-03-17 22:25:59 +0000520 fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
521 fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
Michael Halcrow237fead2006-10-04 02:16:22 -0700522out_lock:
523 unlock_dir(lower_dir_dentry);
524 dput(lower_dentry);
David Howells2b0143b2015-03-17 22:25:59 +0000525 if (d_really_is_negative(dentry))
Michael Halcrow237fead2006-10-04 02:16:22 -0700526 d_drop(dentry);
527 return rc;
528}
529
Al Viro18bb1db2011-07-26 01:41:39 -0400530static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Michael Halcrow237fead2006-10-04 02:16:22 -0700531{
532 int rc;
533 struct dentry *lower_dentry;
534 struct dentry *lower_dir_dentry;
535
536 lower_dentry = ecryptfs_dentry_to_lower(dentry);
537 lower_dir_dentry = lock_parent(lower_dentry);
David Howells2b0143b2015-03-17 22:25:59 +0000538 rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode);
539 if (rc || d_really_is_negative(lower_dentry))
Michael Halcrow237fead2006-10-04 02:16:22 -0700540 goto out;
Tyler Hicks5ccf9202011-05-24 02:16:51 -0500541 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
Michael Halcrow237fead2006-10-04 02:16:22 -0700542 if (rc)
543 goto out;
David Howells2b0143b2015-03-17 22:25:59 +0000544 fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
545 fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
546 set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink);
Michael Halcrow237fead2006-10-04 02:16:22 -0700547out:
548 unlock_dir(lower_dir_dentry);
David Howells2b0143b2015-03-17 22:25:59 +0000549 if (d_really_is_negative(dentry))
Michael Halcrow237fead2006-10-04 02:16:22 -0700550 d_drop(dentry);
551 return rc;
552}
553
554static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
555{
Michael Halcrow237fead2006-10-04 02:16:22 -0700556 struct dentry *lower_dentry;
Michael Halcrow237fead2006-10-04 02:16:22 -0700557 struct dentry *lower_dir_dentry;
Michael Halcrow45ec4aba2006-10-30 22:07:20 -0800558 int rc;
Michael Halcrow237fead2006-10-04 02:16:22 -0700559
560 lower_dentry = ecryptfs_dentry_to_lower(dentry);
Michael Halcrow45ec4aba2006-10-30 22:07:20 -0800561 dget(dentry);
Michael Halcrow237fead2006-10-04 02:16:22 -0700562 lower_dir_dentry = lock_parent(lower_dentry);
Michael Halcrow45ec4aba2006-10-30 22:07:20 -0800563 dget(lower_dentry);
David Howells2b0143b2015-03-17 22:25:59 +0000564 rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry);
Michael Halcrow45ec4aba2006-10-30 22:07:20 -0800565 dput(lower_dentry);
David Howells2b0143b2015-03-17 22:25:59 +0000566 if (!rc && d_really_is_positive(dentry))
567 clear_nlink(d_inode(dentry));
568 fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
569 set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink);
Michael Halcrow237fead2006-10-04 02:16:22 -0700570 unlock_dir(lower_dir_dentry);
571 if (!rc)
572 d_drop(dentry);
Michael Halcrow45ec4aba2006-10-30 22:07:20 -0800573 dput(dentry);
Michael Halcrow237fead2006-10-04 02:16:22 -0700574 return rc;
575}
576
577static int
Al Viro1a67aaf2011-07-26 01:52:52 -0400578ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
Michael Halcrow237fead2006-10-04 02:16:22 -0700579{
580 int rc;
581 struct dentry *lower_dentry;
582 struct dentry *lower_dir_dentry;
583
584 lower_dentry = ecryptfs_dentry_to_lower(dentry);
585 lower_dir_dentry = lock_parent(lower_dentry);
David Howells2b0143b2015-03-17 22:25:59 +0000586 rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev);
587 if (rc || d_really_is_negative(lower_dentry))
Michael Halcrow237fead2006-10-04 02:16:22 -0700588 goto out;
Tyler Hicks5ccf9202011-05-24 02:16:51 -0500589 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
Michael Halcrow237fead2006-10-04 02:16:22 -0700590 if (rc)
591 goto out;
David Howells2b0143b2015-03-17 22:25:59 +0000592 fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
593 fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
Michael Halcrow237fead2006-10-04 02:16:22 -0700594out:
595 unlock_dir(lower_dir_dentry);
David Howells2b0143b2015-03-17 22:25:59 +0000596 if (d_really_is_negative(dentry))
Michael Halcrow237fead2006-10-04 02:16:22 -0700597 d_drop(dentry);
598 return rc;
599}
600
601static int
602ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
603 struct inode *new_dir, struct dentry *new_dentry)
604{
605 int rc;
606 struct dentry *lower_old_dentry;
607 struct dentry *lower_new_dentry;
608 struct dentry *lower_old_dir_dentry;
609 struct dentry *lower_new_dir_dentry;
Erez Zadok0d132f72009-12-05 21:17:09 -0500610 struct dentry *trap = NULL;
Tyler Hicks8335eaf2012-09-13 12:00:56 -0700611 struct inode *target_inode;
Michael Halcrow237fead2006-10-04 02:16:22 -0700612
613 lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
614 lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
615 dget(lower_old_dentry);
616 dget(lower_new_dentry);
617 lower_old_dir_dentry = dget_parent(lower_old_dentry);
618 lower_new_dir_dentry = dget_parent(lower_new_dentry);
David Howells2b0143b2015-03-17 22:25:59 +0000619 target_inode = d_inode(new_dentry);
Erez Zadok0d132f72009-12-05 21:17:09 -0500620 trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
621 /* source should not be ancestor of target */
622 if (trap == lower_old_dentry) {
623 rc = -EINVAL;
624 goto out_lock;
625 }
626 /* target should not be ancestor of source */
627 if (trap == lower_new_dentry) {
628 rc = -ENOTEMPTY;
629 goto out_lock;
630 }
David Howells2b0143b2015-03-17 22:25:59 +0000631 rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry,
632 d_inode(lower_new_dir_dentry), lower_new_dentry,
Miklos Szeredi520c8b12014-04-01 17:08:42 +0200633 NULL, 0);
Michael Halcrow237fead2006-10-04 02:16:22 -0700634 if (rc)
635 goto out_lock;
Tyler Hicks8335eaf2012-09-13 12:00:56 -0700636 if (target_inode)
637 fsstack_copy_attr_all(target_inode,
638 ecryptfs_inode_to_lower(target_inode));
David Howells2b0143b2015-03-17 22:25:59 +0000639 fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry));
Michael Halcrow237fead2006-10-04 02:16:22 -0700640 if (new_dir != old_dir)
David Howells2b0143b2015-03-17 22:25:59 +0000641 fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry));
Michael Halcrow237fead2006-10-04 02:16:22 -0700642out_lock:
643 unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
Tyler Hicksdd55c8982011-04-12 11:23:09 -0500644 dput(lower_new_dir_dentry);
645 dput(lower_old_dir_dentry);
Michael Halcrow237fead2006-10-04 02:16:22 -0700646 dput(lower_new_dentry);
647 dput(lower_old_dentry);
648 return rc;
649}
650
Al Virob22e8fe2013-11-29 22:51:47 -0500651static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz)
Michael Halcrow237fead2006-10-04 02:16:22 -0700652{
Tyler Hicks3a60a162010-03-22 00:41:35 -0500653 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
Michael Halcrow237fead2006-10-04 02:16:22 -0700654 char *lower_buf;
Al Virob22e8fe2013-11-29 22:51:47 -0500655 char *buf;
Michael Halcrowaddd65ad2009-01-06 14:42:00 -0800656 mm_segment_t old_fs;
657 int rc;
Michael Halcrow237fead2006-10-04 02:16:22 -0700658
Al Viro408bd622012-05-03 09:34:20 -0400659 lower_buf = kmalloc(PATH_MAX, GFP_KERNEL);
Al Virob22e8fe2013-11-29 22:51:47 -0500660 if (!lower_buf)
661 return ERR_PTR(-ENOMEM);
Michael Halcrow237fead2006-10-04 02:16:22 -0700662 old_fs = get_fs();
663 set_fs(get_ds());
David Howells2b0143b2015-03-17 22:25:59 +0000664 rc = d_inode(lower_dentry)->i_op->readlink(lower_dentry,
Michael Halcrow237fead2006-10-04 02:16:22 -0700665 (char __user *)lower_buf,
Al Viro408bd622012-05-03 09:34:20 -0400666 PATH_MAX);
Michael Halcrow237fead2006-10-04 02:16:22 -0700667 set_fs(old_fs);
Tyler Hicks3a60a162010-03-22 00:41:35 -0500668 if (rc < 0)
669 goto out;
Al Virob22e8fe2013-11-29 22:51:47 -0500670 rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb,
Al Viro408bd622012-05-03 09:34:20 -0400671 lower_buf, rc);
Tyler Hicks3a60a162010-03-22 00:41:35 -0500672out:
Michael Halcrow237fead2006-10-04 02:16:22 -0700673 kfree(lower_buf);
Al Virob22e8fe2013-11-29 22:51:47 -0500674 return rc ? ERR_PTR(rc) : buf;
Tyler Hicks3a60a162010-03-22 00:41:35 -0500675}
676
Al Viro6e771372015-05-02 13:37:52 -0400677static const char *ecryptfs_follow_link(struct dentry *dentry, void **cookie)
Michael Halcrow237fead2006-10-04 02:16:22 -0700678{
Al Virob22e8fe2013-11-29 22:51:47 -0500679 size_t len;
680 char *buf = ecryptfs_readlink_lower(dentry, &len);
681 if (IS_ERR(buf))
Al Viro680baac2015-05-02 13:32:22 -0400682 return buf;
David Howells2b0143b2015-03-17 22:25:59 +0000683 fsstack_copy_attr_atime(d_inode(dentry),
684 d_inode(ecryptfs_dentry_to_lower(dentry)));
Al Viro408bd622012-05-03 09:34:20 -0400685 buf[len] = '\0';
Al Viro680baac2015-05-02 13:32:22 -0400686 return *cookie = buf;
Michael Halcrow237fead2006-10-04 02:16:22 -0700687}
688
Michael Halcrow237fead2006-10-04 02:16:22 -0700689/**
690 * upper_size_to_lower_size
691 * @crypt_stat: Crypt_stat associated with file
692 * @upper_size: Size of the upper file
693 *
Michael Halcrowcc11bef2008-02-06 01:38:32 -0800694 * Calculate the required size of the lower file based on the
Michael Halcrow237fead2006-10-04 02:16:22 -0700695 * specified size of the upper file. This calculation is based on the
696 * number of headers in the underlying file and the extent size.
697 *
698 * Returns Calculated size of the lower file.
699 */
700static loff_t
701upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
702 loff_t upper_size)
703{
704 loff_t lower_size;
705
Tyler Hicks157f1072010-02-11 07:10:38 -0600706 lower_size = ecryptfs_lower_header_size(crypt_stat);
Michael Halcrow237fead2006-10-04 02:16:22 -0700707 if (upper_size != 0) {
708 loff_t num_extents;
709
710 num_extents = upper_size >> crypt_stat->extent_shift;
711 if (upper_size & ~crypt_stat->extent_mask)
712 num_extents++;
713 lower_size += (num_extents * crypt_stat->extent_size);
714 }
715 return lower_size;
716}
717
718/**
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500719 * truncate_upper
Michael Halcrow237fead2006-10-04 02:16:22 -0700720 * @dentry: The ecryptfs layer dentry
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500721 * @ia: Address of the ecryptfs inode's attributes
722 * @lower_ia: Address of the lower inode's attributes
Michael Halcrow237fead2006-10-04 02:16:22 -0700723 *
724 * Function to handle truncations modifying the size of the file. Note
725 * that the file sizes are interpolated. When expanding, we are simply
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500726 * writing strings of 0's out. When truncating, we truncate the upper
727 * inode and update the lower_ia according to the page index
728 * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
729 * the caller must use lower_ia in a call to notify_change() to perform
730 * the truncation of the lower inode.
Michael Halcrow237fead2006-10-04 02:16:22 -0700731 *
732 * Returns zero on success; non-zero otherwise
733 */
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500734static int truncate_upper(struct dentry *dentry, struct iattr *ia,
735 struct iattr *lower_ia)
Michael Halcrow237fead2006-10-04 02:16:22 -0700736{
737 int rc = 0;
David Howells2b0143b2015-03-17 22:25:59 +0000738 struct inode *inode = d_inode(dentry);
Michael Halcrow237fead2006-10-04 02:16:22 -0700739 struct ecryptfs_crypt_stat *crypt_stat;
740 loff_t i_size = i_size_read(inode);
741 loff_t lower_size_before_truncate;
742 loff_t lower_size_after_truncate;
743
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500744 if (unlikely((ia->ia_size == i_size))) {
745 lower_ia->ia_valid &= ~ATTR_SIZE;
Tyler Hicks332ab162011-04-14 15:35:11 -0500746 return 0;
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500747 }
Tyler Hicks3b06b3e2011-05-24 03:49:02 -0500748 rc = ecryptfs_get_lower_file(dentry, inode);
Tyler Hicks332ab162011-04-14 15:35:11 -0500749 if (rc)
750 return rc;
David Howells2b0143b2015-03-17 22:25:59 +0000751 crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
Michael Halcrow237fead2006-10-04 02:16:22 -0700752 /* Switch on growing or shrinking file */
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500753 if (ia->ia_size > i_size) {
Michael Halcrow2ed92552007-10-16 01:28:10 -0700754 char zero[] = { 0x00 };
Michael Halcrow240e2df2007-06-27 14:09:44 -0700755
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500756 lower_ia->ia_valid &= ~ATTR_SIZE;
Michael Halcrow2ed92552007-10-16 01:28:10 -0700757 /* Write a single 0 at the last position of the file;
758 * this triggers code that will fill in 0's throughout
759 * the intermediate portion of the previous end of the
760 * file and the new and of the file */
Al Viro48c1e442010-05-21 11:09:58 -0400761 rc = ecryptfs_write(inode, zero,
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500762 (ia->ia_size - 1), 1);
763 } else { /* ia->ia_size < i_size_read(inode) */
764 /* We're chopping off all the pages down to the page
765 * in which ia->ia_size is located. Fill in the end of
766 * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
Michael Halcrow2ed92552007-10-16 01:28:10 -0700767 * PAGE_CACHE_SIZE with zeros. */
768 size_t num_zeros = (PAGE_CACHE_SIZE
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500769 - (ia->ia_size & ~PAGE_CACHE_MASK));
Michael Halcrow2ed92552007-10-16 01:28:10 -0700770
Tyler Hicks13a791b2009-04-13 15:29:27 -0500771 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
Christoph Hellwig2c27c652010-06-04 11:30:04 +0200772 truncate_setsize(inode, ia->ia_size);
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500773 lower_ia->ia_size = ia->ia_size;
774 lower_ia->ia_valid |= ATTR_SIZE;
Al Viro48c1e442010-05-21 11:09:58 -0400775 goto out;
Tyler Hicks13a791b2009-04-13 15:29:27 -0500776 }
Michael Halcrow2ed92552007-10-16 01:28:10 -0700777 if (num_zeros) {
778 char *zeros_virt;
779
780 zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
781 if (!zeros_virt) {
782 rc = -ENOMEM;
Al Viro48c1e442010-05-21 11:09:58 -0400783 goto out;
Michael Halcrow2ed92552007-10-16 01:28:10 -0700784 }
Al Viro48c1e442010-05-21 11:09:58 -0400785 rc = ecryptfs_write(inode, zeros_virt,
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500786 ia->ia_size, num_zeros);
Michael Halcrow2ed92552007-10-16 01:28:10 -0700787 kfree(zeros_virt);
Michael Halcrow5dda6992007-10-16 01:28:06 -0700788 if (rc) {
Michael Halcrow240e2df2007-06-27 14:09:44 -0700789 printk(KERN_ERR "Error attempting to zero out "
790 "the remainder of the end page on "
791 "reducing truncate; rc = [%d]\n", rc);
Al Viro48c1e442010-05-21 11:09:58 -0400792 goto out;
Michael Halcrow240e2df2007-06-27 14:09:44 -0700793 }
794 }
Christoph Hellwig2c27c652010-06-04 11:30:04 +0200795 truncate_setsize(inode, ia->ia_size);
Michael Halcrow0216f7f2007-10-16 01:28:08 -0700796 rc = ecryptfs_write_inode_size_to_metadata(inode);
Michael Halcrowdd2a3b72007-02-12 00:53:46 -0800797 if (rc) {
798 printk(KERN_ERR "Problem with "
799 "ecryptfs_write_inode_size_to_metadata; "
800 "rc = [%d]\n", rc);
Al Viro48c1e442010-05-21 11:09:58 -0400801 goto out;
Michael Halcrowdd2a3b72007-02-12 00:53:46 -0800802 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700803 /* We are reducing the size of the ecryptfs file, and need to
804 * know if we need to reduce the size of the lower file. */
805 lower_size_before_truncate =
806 upper_size_to_lower_size(crypt_stat, i_size);
807 lower_size_after_truncate =
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500808 upper_size_to_lower_size(crypt_stat, ia->ia_size);
809 if (lower_size_after_truncate < lower_size_before_truncate) {
810 lower_ia->ia_size = lower_size_after_truncate;
811 lower_ia->ia_valid |= ATTR_SIZE;
812 } else
813 lower_ia->ia_valid &= ~ATTR_SIZE;
Michael Halcrow237fead2006-10-04 02:16:22 -0700814 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700815out:
Tyler Hicks332ab162011-04-14 15:35:11 -0500816 ecryptfs_put_lower_file(inode);
Michael Halcrow237fead2006-10-04 02:16:22 -0700817 return rc;
818}
819
Tyler Hicksa261a032012-01-19 20:33:44 -0600820static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset)
821{
822 struct ecryptfs_crypt_stat *crypt_stat;
823 loff_t lower_oldsize, lower_newsize;
824
825 crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
826 lower_oldsize = upper_size_to_lower_size(crypt_stat,
827 i_size_read(inode));
828 lower_newsize = upper_size_to_lower_size(crypt_stat, offset);
829 if (lower_newsize > lower_oldsize) {
830 /*
831 * The eCryptfs inode and the new *lower* size are mixed here
832 * because we may not have the lower i_mutex held and/or it may
833 * not be appropriate to call inode_newsize_ok() with inodes
834 * from other filesystems.
835 */
836 return inode_newsize_ok(inode, lower_newsize);
837 }
838
839 return 0;
840}
841
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500842/**
843 * ecryptfs_truncate
844 * @dentry: The ecryptfs layer dentry
845 * @new_length: The length to expand the file to
846 *
847 * Simple function that handles the truncation of an eCryptfs inode and
848 * its corresponding lower inode.
849 *
850 * Returns zero on success; non-zero otherwise
851 */
852int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
853{
854 struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
855 struct iattr lower_ia = { .ia_valid = 0 };
856 int rc;
857
David Howells2b0143b2015-03-17 22:25:59 +0000858 rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length);
Tyler Hicksa261a032012-01-19 20:33:44 -0600859 if (rc)
860 return rc;
861
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500862 rc = truncate_upper(dentry, &ia, &lower_ia);
863 if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
864 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
865
David Howells2b0143b2015-03-17 22:25:59 +0000866 mutex_lock(&d_inode(lower_dentry)->i_mutex);
J. Bruce Fields27ac0ff2011-09-20 17:19:26 -0400867 rc = notify_change(lower_dentry, &lower_ia, NULL);
David Howells2b0143b2015-03-17 22:25:59 +0000868 mutex_unlock(&d_inode(lower_dentry)->i_mutex);
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500869 }
870 return rc;
871}
872
Michael Halcrow237fead2006-10-04 02:16:22 -0700873static int
Al Viro10556cb2011-06-20 19:28:19 -0400874ecryptfs_permission(struct inode *inode, int mask)
Michael Halcrow237fead2006-10-04 02:16:22 -0700875{
Al Virof419a2e2008-07-22 00:07:17 -0400876 return inode_permission(ecryptfs_inode_to_lower(inode), mask);
Michael Halcrow237fead2006-10-04 02:16:22 -0700877}
878
879/**
880 * ecryptfs_setattr
881 * @dentry: dentry handle to the inode to modify
882 * @ia: Structure with flags of what to change and values
883 *
884 * Updates the metadata of an inode. If the update is to the size
885 * i.e. truncation, then ecryptfs_truncate will handle the size modification
886 * of both the ecryptfs inode and the lower inode.
887 *
888 * All other metadata changes will be passed right to the lower filesystem,
889 * and we will just update our inode to look like the lower.
890 */
891static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
892{
893 int rc = 0;
894 struct dentry *lower_dentry;
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500895 struct iattr lower_ia;
Michael Halcrow237fead2006-10-04 02:16:22 -0700896 struct inode *inode;
897 struct inode *lower_inode;
898 struct ecryptfs_crypt_stat *crypt_stat;
899
David Howells2b0143b2015-03-17 22:25:59 +0000900 crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
Michael Halcrowe10f2812007-06-27 14:09:44 -0700901 if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
902 ecryptfs_init_crypt_stat(crypt_stat);
David Howells2b0143b2015-03-17 22:25:59 +0000903 inode = d_inode(dentry);
Michael Halcrow237fead2006-10-04 02:16:22 -0700904 lower_inode = ecryptfs_inode_to_lower(inode);
Michael Halcrowe10f2812007-06-27 14:09:44 -0700905 lower_dentry = ecryptfs_dentry_to_lower(dentry);
906 mutex_lock(&crypt_stat->cs_mutex);
David Howellse36cb0b2015-01-29 12:02:35 +0000907 if (d_is_dir(dentry))
Michael Halcrowe10f2812007-06-27 14:09:44 -0700908 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
David Howellse36cb0b2015-01-29 12:02:35 +0000909 else if (d_is_reg(dentry)
Michael Halcrow64ee4802007-07-19 01:47:54 -0700910 && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
911 || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
Michael Halcrowe10f2812007-06-27 14:09:44 -0700912 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
Michael Halcrowe10f2812007-06-27 14:09:44 -0700913
Michael Halcrowe10f2812007-06-27 14:09:44 -0700914 mount_crypt_stat = &ecryptfs_superblock_to_private(
915 dentry->d_sb)->mount_crypt_stat;
Tyler Hicks3b06b3e2011-05-24 03:49:02 -0500916 rc = ecryptfs_get_lower_file(dentry, inode);
Tyler Hicks332ab162011-04-14 15:35:11 -0500917 if (rc) {
918 mutex_unlock(&crypt_stat->cs_mutex);
919 goto out;
920 }
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -0700921 rc = ecryptfs_read_metadata(dentry);
Tyler Hicks332ab162011-04-14 15:35:11 -0500922 ecryptfs_put_lower_file(inode);
Michael Halcrow5dda6992007-10-16 01:28:06 -0700923 if (rc) {
Michael Halcrowe10f2812007-06-27 14:09:44 -0700924 if (!(mount_crypt_stat->flags
925 & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
926 rc = -EIO;
Michael Halcrow25bd8172008-02-06 01:38:35 -0800927 printk(KERN_WARNING "Either the lower file "
Michael Halcrowe10f2812007-06-27 14:09:44 -0700928 "is not in a valid eCryptfs format, "
Michael Halcrow25bd8172008-02-06 01:38:35 -0800929 "or the key could not be retrieved. "
930 "Plaintext passthrough mode is not "
Michael Halcrowe10f2812007-06-27 14:09:44 -0700931 "enabled; returning -EIO\n");
Michael Halcrowe10f2812007-06-27 14:09:44 -0700932 mutex_unlock(&crypt_stat->cs_mutex);
Michael Halcrowe10f2812007-06-27 14:09:44 -0700933 goto out;
934 }
935 rc = 0;
Tyler Hicks3aeb86e2011-03-15 14:54:00 -0500936 crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
937 | ECRYPTFS_ENCRYPTED);
Michael Halcrowe10f2812007-06-27 14:09:44 -0700938 }
Michael Halcrowe10f2812007-06-27 14:09:44 -0700939 }
940 mutex_unlock(&crypt_stat->cs_mutex);
Tyler Hicksa261a032012-01-19 20:33:44 -0600941
942 rc = inode_change_ok(inode, ia);
943 if (rc)
944 goto out;
945 if (ia->ia_valid & ATTR_SIZE) {
946 rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size);
947 if (rc)
948 goto out;
949 }
950
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500951 memcpy(&lower_ia, ia, sizeof(lower_ia));
952 if (ia->ia_valid & ATTR_FILE)
953 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
Michael Halcrow237fead2006-10-04 02:16:22 -0700954 if (ia->ia_valid & ATTR_SIZE) {
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500955 rc = truncate_upper(dentry, ia, &lower_ia);
Michael Halcrow237fead2006-10-04 02:16:22 -0700956 if (rc < 0)
957 goto out;
958 }
Jeff Layton1ac564e2007-10-18 03:05:17 -0700959
960 /*
961 * mode change is for clearing setuid/setgid bits. Allow lower fs
962 * to interpret this in its own way.
963 */
Tyler Hicks5f3ef642009-10-14 16:18:27 -0500964 if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
965 lower_ia.ia_valid &= ~ATTR_MODE;
Jeff Layton1ac564e2007-10-18 03:05:17 -0700966
David Howells2b0143b2015-03-17 22:25:59 +0000967 mutex_lock(&d_inode(lower_dentry)->i_mutex);
J. Bruce Fields27ac0ff2011-09-20 17:19:26 -0400968 rc = notify_change(lower_dentry, &lower_ia, NULL);
David Howells2b0143b2015-03-17 22:25:59 +0000969 mutex_unlock(&d_inode(lower_dentry)->i_mutex);
Michael Halcrow237fead2006-10-04 02:16:22 -0700970out:
Erez Zadok9afa2fb2009-12-02 19:51:54 -0500971 fsstack_copy_attr_all(inode, lower_inode);
Michael Halcrow237fead2006-10-04 02:16:22 -0700972 return rc;
973}
974
Tyler Hicks111d61a2013-01-17 12:19:35 -0800975static int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
976 struct kstat *stat)
Tyler Hicks3a60a162010-03-22 00:41:35 -0500977{
978 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
979 int rc = 0;
980
981 mount_crypt_stat = &ecryptfs_superblock_to_private(
982 dentry->d_sb)->mount_crypt_stat;
David Howells2b0143b2015-03-17 22:25:59 +0000983 generic_fillattr(d_inode(dentry), stat);
Tyler Hicks3a60a162010-03-22 00:41:35 -0500984 if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
985 char *target;
986 size_t targetsiz;
987
Al Virob22e8fe2013-11-29 22:51:47 -0500988 target = ecryptfs_readlink_lower(dentry, &targetsiz);
989 if (!IS_ERR(target)) {
Tyler Hicks3a60a162010-03-22 00:41:35 -0500990 kfree(target);
991 stat->size = targetsiz;
Al Virob22e8fe2013-11-29 22:51:47 -0500992 } else {
993 rc = PTR_ERR(target);
Tyler Hicks3a60a162010-03-22 00:41:35 -0500994 }
995 }
996 return rc;
997}
998
Tyler Hicks111d61a2013-01-17 12:19:35 -0800999static int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1000 struct kstat *stat)
Tyler Hicksf8f484d2009-11-04 02:48:01 -06001001{
1002 struct kstat lower_stat;
1003 int rc;
1004
Al Viro3dadecc2013-01-24 02:18:08 -05001005 rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat);
Tyler Hicksf8f484d2009-11-04 02:48:01 -06001006 if (!rc) {
David Howells2b0143b2015-03-17 22:25:59 +00001007 fsstack_copy_attr_all(d_inode(dentry),
1008 ecryptfs_inode_to_lower(d_inode(dentry)));
1009 generic_fillattr(d_inode(dentry), stat);
Tyler Hicksf8f484d2009-11-04 02:48:01 -06001010 stat->blocks = lower_stat.blocks;
1011 }
1012 return rc;
1013}
1014
Michael Halcrowdd2a3b72007-02-12 00:53:46 -08001015int
Michael Halcrow237fead2006-10-04 02:16:22 -07001016ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1017 size_t size, int flags)
1018{
1019 int rc = 0;
1020 struct dentry *lower_dentry;
1021
1022 lower_dentry = ecryptfs_dentry_to_lower(dentry);
David Howells2b0143b2015-03-17 22:25:59 +00001023 if (!d_inode(lower_dentry)->i_op->setxattr) {
Christian Pulvermachercfce08c2010-03-23 11:51:38 -05001024 rc = -EOPNOTSUPP;
Michael Halcrow237fead2006-10-04 02:16:22 -07001025 goto out;
1026 }
Roberto Sassu48b512e2010-10-05 18:53:45 +02001027
1028 rc = vfs_setxattr(lower_dentry, name, value, size, flags);
David Howells2b0143b2015-03-17 22:25:59 +00001029 if (!rc && d_really_is_positive(dentry))
1030 fsstack_copy_attr_all(d_inode(dentry), d_inode(lower_dentry));
Michael Halcrow237fead2006-10-04 02:16:22 -07001031out:
1032 return rc;
1033}
1034
Michael Halcrowdd2a3b72007-02-12 00:53:46 -08001035ssize_t
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -07001036ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1037 void *value, size_t size)
1038{
1039 int rc = 0;
1040
David Howells2b0143b2015-03-17 22:25:59 +00001041 if (!d_inode(lower_dentry)->i_op->getxattr) {
Christian Pulvermachercfce08c2010-03-23 11:51:38 -05001042 rc = -EOPNOTSUPP;
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -07001043 goto out;
1044 }
David Howells2b0143b2015-03-17 22:25:59 +00001045 mutex_lock(&d_inode(lower_dentry)->i_mutex);
1046 rc = d_inode(lower_dentry)->i_op->getxattr(lower_dentry, name, value,
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -07001047 size);
David Howells2b0143b2015-03-17 22:25:59 +00001048 mutex_unlock(&d_inode(lower_dentry)->i_mutex);
Michael Halcrowd7cdc5f2007-10-16 01:28:10 -07001049out:
1050 return rc;
1051}
1052
Adrian Bunk7896b632008-02-06 01:38:32 -08001053static ssize_t
Michael Halcrow237fead2006-10-04 02:16:22 -07001054ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1055 size_t size)
1056{
Michael Halcrow2ed92552007-10-16 01:28:10 -07001057 return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1058 value, size);
Michael Halcrow237fead2006-10-04 02:16:22 -07001059}
1060
1061static ssize_t
1062ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1063{
1064 int rc = 0;
1065 struct dentry *lower_dentry;
1066
1067 lower_dentry = ecryptfs_dentry_to_lower(dentry);
David Howells2b0143b2015-03-17 22:25:59 +00001068 if (!d_inode(lower_dentry)->i_op->listxattr) {
Christian Pulvermachercfce08c2010-03-23 11:51:38 -05001069 rc = -EOPNOTSUPP;
Michael Halcrow237fead2006-10-04 02:16:22 -07001070 goto out;
1071 }
David Howells2b0143b2015-03-17 22:25:59 +00001072 mutex_lock(&d_inode(lower_dentry)->i_mutex);
1073 rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size);
1074 mutex_unlock(&d_inode(lower_dentry)->i_mutex);
Michael Halcrow237fead2006-10-04 02:16:22 -07001075out:
1076 return rc;
1077}
1078
1079static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1080{
1081 int rc = 0;
1082 struct dentry *lower_dentry;
1083
1084 lower_dentry = ecryptfs_dentry_to_lower(dentry);
David Howells2b0143b2015-03-17 22:25:59 +00001085 if (!d_inode(lower_dentry)->i_op->removexattr) {
Christian Pulvermachercfce08c2010-03-23 11:51:38 -05001086 rc = -EOPNOTSUPP;
Michael Halcrow237fead2006-10-04 02:16:22 -07001087 goto out;
1088 }
David Howells2b0143b2015-03-17 22:25:59 +00001089 mutex_lock(&d_inode(lower_dentry)->i_mutex);
1090 rc = d_inode(lower_dentry)->i_op->removexattr(lower_dentry, name);
1091 mutex_unlock(&d_inode(lower_dentry)->i_mutex);
Michael Halcrow237fead2006-10-04 02:16:22 -07001092out:
1093 return rc;
1094}
1095
Arjan van de Ven754661f2007-02-12 00:55:38 -08001096const struct inode_operations ecryptfs_symlink_iops = {
Al Viro408bd622012-05-03 09:34:20 -04001097 .readlink = generic_readlink,
Michael Halcrow237fead2006-10-04 02:16:22 -07001098 .follow_link = ecryptfs_follow_link,
Al Viro87dc8002013-09-16 10:30:04 -04001099 .put_link = kfree_put_link,
Michael Halcrow237fead2006-10-04 02:16:22 -07001100 .permission = ecryptfs_permission,
1101 .setattr = ecryptfs_setattr,
Tyler Hicks3a60a162010-03-22 00:41:35 -05001102 .getattr = ecryptfs_getattr_link,
Michael Halcrow237fead2006-10-04 02:16:22 -07001103 .setxattr = ecryptfs_setxattr,
1104 .getxattr = ecryptfs_getxattr,
1105 .listxattr = ecryptfs_listxattr,
1106 .removexattr = ecryptfs_removexattr
1107};
1108
Arjan van de Ven754661f2007-02-12 00:55:38 -08001109const struct inode_operations ecryptfs_dir_iops = {
Michael Halcrow237fead2006-10-04 02:16:22 -07001110 .create = ecryptfs_create,
1111 .lookup = ecryptfs_lookup,
1112 .link = ecryptfs_link,
1113 .unlink = ecryptfs_unlink,
1114 .symlink = ecryptfs_symlink,
1115 .mkdir = ecryptfs_mkdir,
1116 .rmdir = ecryptfs_rmdir,
1117 .mknod = ecryptfs_mknod,
1118 .rename = ecryptfs_rename,
1119 .permission = ecryptfs_permission,
1120 .setattr = ecryptfs_setattr,
1121 .setxattr = ecryptfs_setxattr,
1122 .getxattr = ecryptfs_getxattr,
1123 .listxattr = ecryptfs_listxattr,
1124 .removexattr = ecryptfs_removexattr
1125};
1126
Arjan van de Ven754661f2007-02-12 00:55:38 -08001127const struct inode_operations ecryptfs_main_iops = {
Michael Halcrow237fead2006-10-04 02:16:22 -07001128 .permission = ecryptfs_permission,
1129 .setattr = ecryptfs_setattr,
Tyler Hicksf8f484d2009-11-04 02:48:01 -06001130 .getattr = ecryptfs_getattr,
Michael Halcrow237fead2006-10-04 02:16:22 -07001131 .setxattr = ecryptfs_setxattr,
1132 .getxattr = ecryptfs_getxattr,
1133 .listxattr = ecryptfs_listxattr,
1134 .removexattr = ecryptfs_removexattr
1135};