hfs: update timestamp on truncate()
[linux-2.6-block.git] / fs / ecryptfs / inode.c
CommitLineData
237fead6
MH
1/**
2 * eCryptfs: Linux filesystem encryption layer
3 *
4 * Copyright (C) 1997-2004 Erez Zadok
5 * Copyright (C) 2001-2004 Stony Brook University
dd2a3b7a 6 * Copyright (C) 2004-2007 International Business Machines Corp.
237fead6
MH
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>
0cc72dc7 32#include <linux/fs_stack.h>
5a0e3ad6 33#include <linux/slab.h>
48b512e6 34#include <linux/xattr.h>
0a688ad7 35#include <asm/unaligned.h>
237fead6
MH
36#include "ecryptfs_kernel.h"
37
38static struct dentry *lock_parent(struct dentry *dentry)
39{
40 struct dentry *dir;
41
8dc4e373 42 dir = dget_parent(dentry);
5955102c 43 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
237fead6
MH
44 return dir;
45}
46
237fead6
MH
47static void unlock_dir(struct dentry *dir)
48{
5955102c 49 inode_unlock(d_inode(dir));
237fead6
MH
50 dput(dir);
51}
52
c4f79073
TH
53static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
54{
c4cf3ba4 55 return ecryptfs_inode_to_lower(inode) == lower_inode;
c4f79073
TH
56}
57
5ccf9203 58static int ecryptfs_inode_set(struct inode *inode, void *opaque)
c4f79073 59{
5ccf9203
TH
60 struct inode *lower_inode = opaque;
61
62 ecryptfs_set_inode_lower(inode, lower_inode);
63 fsstack_copy_attr_all(inode, lower_inode);
64 /* i_size will be overwritten for encrypted regular files */
65 fsstack_copy_inode_size(inode, lower_inode);
66 inode->i_ino = lower_inode->i_ino;
c4f79073 67 inode->i_mapping->a_ops = &ecryptfs_aops;
5ccf9203
TH
68
69 if (S_ISLNK(inode->i_mode))
70 inode->i_op = &ecryptfs_symlink_iops;
71 else if (S_ISDIR(inode->i_mode))
72 inode->i_op = &ecryptfs_dir_iops;
73 else
74 inode->i_op = &ecryptfs_main_iops;
75
76 if (S_ISDIR(inode->i_mode))
77 inode->i_fop = &ecryptfs_dir_fops;
78 else if (special_file(inode->i_mode))
79 init_special_inode(inode, inode->i_mode, inode->i_rdev);
80 else
81 inode->i_fop = &ecryptfs_main_fops;
82
c4f79073
TH
83 return 0;
84}
85
5ccf9203
TH
86static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
87 struct super_block *sb)
c4f79073
TH
88{
89 struct inode *inode;
c4f79073 90
5ccf9203
TH
91 if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
92 return ERR_PTR(-EXDEV);
93 if (!igrab(lower_inode))
94 return ERR_PTR(-ESTALE);
c4f79073
TH
95 inode = iget5_locked(sb, (unsigned long)lower_inode,
96 ecryptfs_inode_test, ecryptfs_inode_set,
97 lower_inode);
98 if (!inode) {
c4f79073 99 iput(lower_inode);
5ccf9203 100 return ERR_PTR(-EACCES);
c4f79073 101 }
5ccf9203 102 if (!(inode->i_state & I_NEW))
c4f79073 103 iput(lower_inode);
5ccf9203
TH
104
105 return inode;
106}
107
108struct inode *ecryptfs_get_inode(struct inode *lower_inode,
109 struct super_block *sb)
110{
111 struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
112
113 if (!IS_ERR(inode) && (inode->i_state & I_NEW))
114 unlock_new_inode(inode);
115
c4f79073 116 return inode;
c4f79073
TH
117}
118
c4f79073
TH
119/**
120 * ecryptfs_interpose
121 * @lower_dentry: Existing dentry in the lower filesystem
122 * @dentry: ecryptfs' dentry
123 * @sb: ecryptfs's super_block
c4f79073
TH
124 *
125 * Interposes upper and lower dentries.
126 *
127 * Returns zero on success; non-zero otherwise
128 */
129static int ecryptfs_interpose(struct dentry *lower_dentry,
5ccf9203 130 struct dentry *dentry, struct super_block *sb)
c4f79073 131{
2b0143b5 132 struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb);
5ccf9203 133
c4f79073
TH
134 if (IS_ERR(inode))
135 return PTR_ERR(inode);
5ccf9203
TH
136 d_instantiate(dentry, inode);
137
c4f79073
TH
138 return 0;
139}
140
8bc2d3cf
TH
141static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry,
142 struct inode *inode)
143{
144 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
145 struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
146 struct dentry *lower_dir_dentry;
147 int rc;
148
149 dget(lower_dentry);
150 lower_dir_dentry = lock_parent(lower_dentry);
b21996e3 151 rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL);
8bc2d3cf
TH
152 if (rc) {
153 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
154 goto out_unlock;
155 }
156 fsstack_copy_attr_times(dir, lower_dir_inode);
157 set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink);
158 inode->i_ctime = dir->i_ctime;
159 d_drop(dentry);
160out_unlock:
161 unlock_dir(lower_dir_dentry);
162 dput(lower_dentry);
163 return rc;
164}
165
237fead6
MH
166/**
167 * ecryptfs_do_create
168 * @directory_inode: inode of the new file's dentry's parent in ecryptfs
169 * @ecryptfs_dentry: New file's dentry in ecryptfs
170 * @mode: The mode of the new file
237fead6
MH
171 *
172 * Creates the underlying file and the eCryptfs inode which will link to
173 * it. It will also update the eCryptfs directory inode to mimic the
174 * stat of the lower directory inode.
175 *
b59db43a 176 * Returns the new eCryptfs inode on success; an ERR_PTR on error condition
237fead6 177 */
b59db43a 178static struct inode *
237fead6 179ecryptfs_do_create(struct inode *directory_inode,
175a4eb7 180 struct dentry *ecryptfs_dentry, umode_t mode)
237fead6
MH
181{
182 int rc;
183 struct dentry *lower_dentry;
184 struct dentry *lower_dir_dentry;
b59db43a 185 struct inode *inode;
237fead6
MH
186
187 lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
188 lower_dir_dentry = lock_parent(lower_dentry);
2b0143b5 189 rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true);
4981e081 190 if (rc) {
caeeeecf 191 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
18d1dbf1 192 "rc = [%d]\n", __func__, rc);
b59db43a 193 inode = ERR_PTR(rc);
caeeeecf 194 goto out_lock;
237fead6 195 }
2b0143b5 196 inode = __ecryptfs_get_inode(d_inode(lower_dentry),
b59db43a 197 directory_inode->i_sb);
8bc2d3cf 198 if (IS_ERR(inode)) {
2b0143b5 199 vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL);
237fead6 200 goto out_lock;
8bc2d3cf 201 }
2b0143b5
DH
202 fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry));
203 fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry));
237fead6
MH
204out_lock:
205 unlock_dir(lower_dir_dentry);
b59db43a 206 return inode;
237fead6
MH
207}
208
237fead6
MH
209/**
210 * ecryptfs_initialize_file
211 *
212 * Cause the file to be changed from a basic empty file to an ecryptfs
213 * file with a header and first data page.
214 *
215 * Returns zero on success
216 */
e3ccaa97
TH
217int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
218 struct inode *ecryptfs_inode)
237fead6 219{
d7cdc5fe 220 struct ecryptfs_crypt_stat *crypt_stat =
b59db43a 221 &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
237fead6 222 int rc = 0;
237fead6 223
b59db43a 224 if (S_ISDIR(ecryptfs_inode->i_mode)) {
237fead6 225 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
e2bd99ec 226 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
d7cdc5fe 227 goto out;
237fead6 228 }
237fead6 229 ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
b59db43a 230 rc = ecryptfs_new_file_context(ecryptfs_inode);
237fead6 231 if (rc) {
d7cdc5fe
MH
232 ecryptfs_printk(KERN_ERR, "Error creating new file "
233 "context; rc = [%d]\n", rc);
234 goto out;
237fead6 235 }
b59db43a 236 rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode);
27992890
RS
237 if (rc) {
238 printk(KERN_ERR "%s: Error attempting to initialize "
332ab16f 239 "the lower file for the dentry with name "
9e78d14a
DH
240 "[%pd]; rc = [%d]\n", __func__,
241 ecryptfs_dentry, rc);
27992890 242 goto out;
391b52f9 243 }
b59db43a 244 rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode);
332ab16f 245 if (rc)
d7cdc5fe 246 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
b59db43a 247 ecryptfs_put_lower_file(ecryptfs_inode);
237fead6
MH
248out:
249 return rc;
250}
251
252/**
253 * ecryptfs_create
254 * @dir: The inode of the directory in which to create the file.
255 * @dentry: The eCryptfs dentry
256 * @mode: The mode of the new file.
237fead6
MH
257 *
258 * Creates a new file.
259 *
260 * Returns zero on success; non-zero on error condition
261 */
262static int
263ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
ebfc3b49 264 umode_t mode, bool excl)
237fead6 265{
b59db43a 266 struct inode *ecryptfs_inode;
237fead6
MH
267 int rc;
268
b59db43a
TH
269 ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry,
270 mode);
a1c83681 271 if (IS_ERR(ecryptfs_inode)) {
237fead6
MH
272 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
273 "lower filesystem\n");
b59db43a 274 rc = PTR_ERR(ecryptfs_inode);
237fead6
MH
275 goto out;
276 }
277 /* At this point, a file exists on "disk"; we need to make sure
278 * that this on disk file is prepared to be an ecryptfs file */
b59db43a
TH
279 rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode);
280 if (rc) {
8bc2d3cf
TH
281 ecryptfs_do_unlink(directory_inode, ecryptfs_dentry,
282 ecryptfs_inode);
0e81ba23 283 iget_failed(ecryptfs_inode);
b59db43a
TH
284 goto out;
285 }
1e2e547a 286 d_instantiate_new(ecryptfs_dentry, ecryptfs_inode);
237fead6
MH
287out:
288 return rc;
289}
290
778aeb42
TH
291static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
292{
293 struct ecryptfs_crypt_stat *crypt_stat;
294 int rc;
295
296 rc = ecryptfs_get_lower_file(dentry, inode);
297 if (rc) {
298 printk(KERN_ERR "%s: Error attempting to initialize "
299 "the lower file for the dentry with name "
9e78d14a
DH
300 "[%pd]; rc = [%d]\n", __func__,
301 dentry, rc);
778aeb42
TH
302 return rc;
303 }
304
305 crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
306 /* TODO: lock for crypt_stat comparison */
307 if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
308 ecryptfs_set_default_sizes(crypt_stat);
309
310 rc = ecryptfs_read_and_validate_header_region(inode);
311 ecryptfs_put_lower_file(inode);
312 if (rc) {
313 rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
314 if (!rc)
315 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
316 }
317
318 /* Must return 0 to allow non-eCryptfs files to be looked up, too */
319 return 0;
320}
321
237fead6 322/**
5ccf9203 323 * ecryptfs_lookup_interpose - Dentry interposition for a lookup
237fead6 324 */
b1168a92
AV
325static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry,
326 struct dentry *lower_dentry)
237fead6 327{
2b0143b5 328 struct inode *inode, *lower_inode = d_inode(lower_dentry);
778aeb42 329 struct ecryptfs_dentry_info *dentry_info;
237fead6 330 struct vfsmount *lower_mnt;
778aeb42
TH
331 int rc = 0;
332
778aeb42 333 dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
778aeb42 334 if (!dentry_info) {
778aeb42 335 dput(lower_dentry);
b1168a92 336 return ERR_PTR(-ENOMEM);
237fead6 337 }
0b1d9011
AV
338
339 lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
b1168a92
AV
340 fsstack_copy_attr_atime(d_inode(dentry->d_parent),
341 d_inode(lower_dentry->d_parent));
84d08fa8 342 BUG_ON(!d_count(lower_dentry));
0b1d9011
AV
343
344 ecryptfs_set_dentry_private(dentry, dentry_info);
92dd1230
AV
345 dentry_info->lower_path.mnt = lower_mnt;
346 dentry_info->lower_path.dentry = lower_dentry;
778aeb42 347
2b0143b5 348 if (d_really_is_negative(lower_dentry)) {
237fead6 349 /* We want to add because we couldn't find in lower */
778aeb42 350 d_add(dentry, NULL);
b1168a92 351 return NULL;
237fead6 352 }
b1168a92 353 inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb);
5ccf9203 354 if (IS_ERR(inode)) {
778aeb42
TH
355 printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
356 __func__, PTR_ERR(inode));
b1168a92 357 return ERR_CAST(inode);
391b52f9 358 }
778aeb42
TH
359 if (S_ISREG(inode->i_mode)) {
360 rc = ecryptfs_i_size_read(dentry, inode);
dd2a3b7a 361 if (rc) {
778aeb42 362 make_bad_inode(inode);
b1168a92 363 return ERR_PTR(rc);
237fead6 364 }
237fead6 365 }
778aeb42 366
3b06b3eb
TH
367 if (inode->i_state & I_NEW)
368 unlock_new_inode(inode);
b1168a92 369 return d_splice_alias(inode, dentry);
addd65ad
MH
370}
371
372/**
373 * ecryptfs_lookup
374 * @ecryptfs_dir_inode: The eCryptfs directory inode
375 * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
89076bc3 376 * @flags: lookup flags
addd65ad
MH
377 *
378 * Find a file on disk. If the file does not exist, then we'll add it to the
379 * dentry cache and continue on to read it from the disk.
380 */
381static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
382 struct dentry *ecryptfs_dentry,
00cd8dd3 383 unsigned int flags)
addd65ad
MH
384{
385 char *encrypted_and_encoded_name = NULL;
88ae4ab9 386 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
addd65ad 387 struct dentry *lower_dir_dentry, *lower_dentry;
88ae4ab9
AV
388 const char *name = ecryptfs_dentry->d_name.name;
389 size_t len = ecryptfs_dentry->d_name.len;
b1168a92 390 struct dentry *res;
addd65ad
MH
391 int rc = 0;
392
addd65ad 393 lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
88ae4ab9 394
2aac0cf8
TH
395 mount_crypt_stat = &ecryptfs_superblock_to_private(
396 ecryptfs_dentry->d_sb)->mount_crypt_stat;
ab13a921 397 if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
88ae4ab9
AV
398 rc = ecryptfs_encrypt_and_encode_filename(
399 &encrypted_and_encoded_name, &len,
400 mount_crypt_stat, name, len);
401 if (rc) {
402 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
403 "filename; rc = [%d]\n", __func__, rc);
404 return ERR_PTR(rc);
405 }
406 name = encrypted_and_encoded_name;
addd65ad 407 }
88ae4ab9
AV
408
409 lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len);
addd65ad 410 if (IS_ERR(lower_dentry)) {
8787c7a3 411 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
b1168a92
AV
412 "[%ld] on lower_dentry = [%s]\n", __func__,
413 PTR_ERR(lower_dentry),
88ae4ab9 414 name);
b1168a92 415 res = ERR_CAST(lower_dentry);
88ae4ab9
AV
416 } else {
417 res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry);
addd65ad 418 }
addd65ad 419 kfree(encrypted_and_encoded_name);
b1168a92 420 return res;
237fead6
MH
421}
422
423static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
424 struct dentry *new_dentry)
425{
426 struct dentry *lower_old_dentry;
427 struct dentry *lower_new_dentry;
428 struct dentry *lower_dir_dentry;
429 u64 file_size_save;
430 int rc;
431
2b0143b5 432 file_size_save = i_size_read(d_inode(old_dentry));
237fead6
MH
433 lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
434 lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
435 dget(lower_old_dentry);
436 dget(lower_new_dentry);
437 lower_dir_dentry = lock_parent(lower_new_dentry);
2b0143b5 438 rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry),
146a8595 439 lower_new_dentry, NULL);
2b0143b5 440 if (rc || d_really_is_negative(lower_new_dentry))
237fead6 441 goto out_lock;
5ccf9203 442 rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
237fead6
MH
443 if (rc)
444 goto out_lock;
2b0143b5
DH
445 fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
446 fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
447 set_nlink(d_inode(old_dentry),
448 ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink);
449 i_size_write(d_inode(new_dentry), file_size_save);
237fead6
MH
450out_lock:
451 unlock_dir(lower_dir_dentry);
452 dput(lower_new_dentry);
453 dput(lower_old_dentry);
237fead6
MH
454 return rc;
455}
456
457static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
458{
2b0143b5 459 return ecryptfs_do_unlink(dir, dentry, d_inode(dentry));
237fead6
MH
460}
461
462static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
463 const char *symname)
464{
465 int rc;
466 struct dentry *lower_dentry;
467 struct dentry *lower_dir_dentry;
237fead6 468 char *encoded_symname;
addd65ad
MH
469 size_t encoded_symlen;
470 struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
237fead6
MH
471
472 lower_dentry = ecryptfs_dentry_to_lower(dentry);
473 dget(lower_dentry);
474 lower_dir_dentry = lock_parent(lower_dentry);
addd65ad
MH
475 mount_crypt_stat = &ecryptfs_superblock_to_private(
476 dir->i_sb)->mount_crypt_stat;
477 rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
478 &encoded_symlen,
addd65ad
MH
479 mount_crypt_stat, symname,
480 strlen(symname));
481 if (rc)
237fead6 482 goto out_lock;
2b0143b5 483 rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry,
db2e747b 484 encoded_symname);
237fead6 485 kfree(encoded_symname);
2b0143b5 486 if (rc || d_really_is_negative(lower_dentry))
237fead6 487 goto out_lock;
5ccf9203 488 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
237fead6
MH
489 if (rc)
490 goto out_lock;
2b0143b5
DH
491 fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
492 fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
237fead6
MH
493out_lock:
494 unlock_dir(lower_dir_dentry);
495 dput(lower_dentry);
2b0143b5 496 if (d_really_is_negative(dentry))
237fead6
MH
497 d_drop(dentry);
498 return rc;
499}
500
18bb1db3 501static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
237fead6
MH
502{
503 int rc;
504 struct dentry *lower_dentry;
505 struct dentry *lower_dir_dentry;
506
507 lower_dentry = ecryptfs_dentry_to_lower(dentry);
508 lower_dir_dentry = lock_parent(lower_dentry);
2b0143b5
DH
509 rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode);
510 if (rc || d_really_is_negative(lower_dentry))
237fead6 511 goto out;
5ccf9203 512 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
237fead6
MH
513 if (rc)
514 goto out;
2b0143b5
DH
515 fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
516 fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
517 set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink);
237fead6
MH
518out:
519 unlock_dir(lower_dir_dentry);
2b0143b5 520 if (d_really_is_negative(dentry))
237fead6
MH
521 d_drop(dentry);
522 return rc;
523}
524
525static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
526{
237fead6 527 struct dentry *lower_dentry;
237fead6 528 struct dentry *lower_dir_dentry;
45ec4aba 529 int rc;
237fead6
MH
530
531 lower_dentry = ecryptfs_dentry_to_lower(dentry);
45ec4aba 532 dget(dentry);
237fead6 533 lower_dir_dentry = lock_parent(lower_dentry);
45ec4aba 534 dget(lower_dentry);
2b0143b5 535 rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry);
45ec4aba 536 dput(lower_dentry);
2b0143b5
DH
537 if (!rc && d_really_is_positive(dentry))
538 clear_nlink(d_inode(dentry));
539 fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
540 set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink);
237fead6
MH
541 unlock_dir(lower_dir_dentry);
542 if (!rc)
543 d_drop(dentry);
45ec4aba 544 dput(dentry);
237fead6
MH
545 return rc;
546}
547
548static int
1a67aafb 549ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
237fead6
MH
550{
551 int rc;
552 struct dentry *lower_dentry;
553 struct dentry *lower_dir_dentry;
554
555 lower_dentry = ecryptfs_dentry_to_lower(dentry);
556 lower_dir_dentry = lock_parent(lower_dentry);
2b0143b5
DH
557 rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev);
558 if (rc || d_really_is_negative(lower_dentry))
237fead6 559 goto out;
5ccf9203 560 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
237fead6
MH
561 if (rc)
562 goto out;
2b0143b5
DH
563 fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
564 fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
237fead6
MH
565out:
566 unlock_dir(lower_dir_dentry);
2b0143b5 567 if (d_really_is_negative(dentry))
237fead6
MH
568 d_drop(dentry);
569 return rc;
570}
571
572static int
573ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1cd66c93
MS
574 struct inode *new_dir, struct dentry *new_dentry,
575 unsigned int flags)
237fead6
MH
576{
577 int rc;
578 struct dentry *lower_old_dentry;
579 struct dentry *lower_new_dentry;
580 struct dentry *lower_old_dir_dentry;
581 struct dentry *lower_new_dir_dentry;
0d132f73 582 struct dentry *trap = NULL;
8335eafc 583 struct inode *target_inode;
237fead6 584
1cd66c93
MS
585 if (flags)
586 return -EINVAL;
587
237fead6
MH
588 lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
589 lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
590 dget(lower_old_dentry);
591 dget(lower_new_dentry);
592 lower_old_dir_dentry = dget_parent(lower_old_dentry);
593 lower_new_dir_dentry = dget_parent(lower_new_dentry);
2b0143b5 594 target_inode = d_inode(new_dentry);
0d132f73 595 trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
74dd7c97
AV
596 rc = -EINVAL;
597 if (lower_old_dentry->d_parent != lower_old_dir_dentry)
598 goto out_lock;
599 if (lower_new_dentry->d_parent != lower_new_dir_dentry)
600 goto out_lock;
601 if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry))
602 goto out_lock;
0d132f73 603 /* source should not be ancestor of target */
74dd7c97 604 if (trap == lower_old_dentry)
0d132f73 605 goto out_lock;
0d132f73
EZ
606 /* target should not be ancestor of source */
607 if (trap == lower_new_dentry) {
608 rc = -ENOTEMPTY;
609 goto out_lock;
610 }
2b0143b5
DH
611 rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry,
612 d_inode(lower_new_dir_dentry), lower_new_dentry,
520c8b16 613 NULL, 0);
237fead6
MH
614 if (rc)
615 goto out_lock;
8335eafc
TH
616 if (target_inode)
617 fsstack_copy_attr_all(target_inode,
618 ecryptfs_inode_to_lower(target_inode));
2b0143b5 619 fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry));
237fead6 620 if (new_dir != old_dir)
2b0143b5 621 fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry));
237fead6
MH
622out_lock:
623 unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
dd55c898
TH
624 dput(lower_new_dir_dentry);
625 dput(lower_old_dir_dentry);
237fead6
MH
626 dput(lower_new_dentry);
627 dput(lower_old_dentry);
628 return rc;
629}
630
b22e8fed 631static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz)
237fead6 632{
6c988f57 633 DEFINE_DELAYED_CALL(done);
3a60a168 634 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
6c988f57 635 const char *link;
b22e8fed 636 char *buf;
addd65ad 637 int rc;
237fead6 638
6c988f57
MS
639 link = vfs_get_link(lower_dentry, &done);
640 if (IS_ERR(link))
641 return ERR_CAST(link);
642
b22e8fed 643 rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb,
6c988f57
MS
644 link, strlen(link));
645 do_delayed_call(&done);
646 if (rc)
647 return ERR_PTR(rc);
648
649 return buf;
3a60a168
TH
650}
651
6b255391 652static const char *ecryptfs_get_link(struct dentry *dentry,
fceef393
AV
653 struct inode *inode,
654 struct delayed_call *done)
3a60a168 655{
b22e8fed 656 size_t len;
6b255391
AV
657 char *buf;
658
659 if (!dentry)
660 return ERR_PTR(-ECHILD);
661
662 buf = ecryptfs_readlink_lower(dentry, &len);
b22e8fed 663 if (IS_ERR(buf))
680baacb 664 return buf;
2b0143b5
DH
665 fsstack_copy_attr_atime(d_inode(dentry),
666 d_inode(ecryptfs_dentry_to_lower(dentry)));
408bd629 667 buf[len] = '\0';
fceef393
AV
668 set_delayed_call(done, kfree_link, buf);
669 return buf;
237fead6
MH
670}
671
237fead6
MH
672/**
673 * upper_size_to_lower_size
674 * @crypt_stat: Crypt_stat associated with file
675 * @upper_size: Size of the upper file
676 *
cc11beff 677 * Calculate the required size of the lower file based on the
237fead6
MH
678 * specified size of the upper file. This calculation is based on the
679 * number of headers in the underlying file and the extent size.
680 *
681 * Returns Calculated size of the lower file.
682 */
683static loff_t
684upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
685 loff_t upper_size)
686{
687 loff_t lower_size;
688
157f1071 689 lower_size = ecryptfs_lower_header_size(crypt_stat);
237fead6
MH
690 if (upper_size != 0) {
691 loff_t num_extents;
692
693 num_extents = upper_size >> crypt_stat->extent_shift;
694 if (upper_size & ~crypt_stat->extent_mask)
695 num_extents++;
696 lower_size += (num_extents * crypt_stat->extent_size);
697 }
698 return lower_size;
699}
700
701/**
5f3ef64f 702 * truncate_upper
237fead6 703 * @dentry: The ecryptfs layer dentry
5f3ef64f
TH
704 * @ia: Address of the ecryptfs inode's attributes
705 * @lower_ia: Address of the lower inode's attributes
237fead6
MH
706 *
707 * Function to handle truncations modifying the size of the file. Note
708 * that the file sizes are interpolated. When expanding, we are simply
5f3ef64f
TH
709 * writing strings of 0's out. When truncating, we truncate the upper
710 * inode and update the lower_ia according to the page index
711 * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
712 * the caller must use lower_ia in a call to notify_change() to perform
713 * the truncation of the lower inode.
237fead6
MH
714 *
715 * Returns zero on success; non-zero otherwise
716 */
5f3ef64f
TH
717static int truncate_upper(struct dentry *dentry, struct iattr *ia,
718 struct iattr *lower_ia)
237fead6
MH
719{
720 int rc = 0;
2b0143b5 721 struct inode *inode = d_inode(dentry);
237fead6
MH
722 struct ecryptfs_crypt_stat *crypt_stat;
723 loff_t i_size = i_size_read(inode);
724 loff_t lower_size_before_truncate;
725 loff_t lower_size_after_truncate;
726
5f3ef64f
TH
727 if (unlikely((ia->ia_size == i_size))) {
728 lower_ia->ia_valid &= ~ATTR_SIZE;
332ab16f 729 return 0;
5f3ef64f 730 }
3b06b3eb 731 rc = ecryptfs_get_lower_file(dentry, inode);
332ab16f
TH
732 if (rc)
733 return rc;
2b0143b5 734 crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
237fead6 735 /* Switch on growing or shrinking file */
5f3ef64f 736 if (ia->ia_size > i_size) {
2ed92554
MH
737 char zero[] = { 0x00 };
738
5f3ef64f 739 lower_ia->ia_valid &= ~ATTR_SIZE;
2ed92554
MH
740 /* Write a single 0 at the last position of the file;
741 * this triggers code that will fill in 0's throughout
742 * the intermediate portion of the previous end of the
743 * file and the new and of the file */
48c1e44a 744 rc = ecryptfs_write(inode, zero,
5f3ef64f
TH
745 (ia->ia_size - 1), 1);
746 } else { /* ia->ia_size < i_size_read(inode) */
747 /* We're chopping off all the pages down to the page
748 * in which ia->ia_size is located. Fill in the end of
ea1754a0
KS
749 * that page from (ia->ia_size & ~PAGE_MASK) to
750 * PAGE_SIZE with zeros. */
09cbfeaf
KS
751 size_t num_zeros = (PAGE_SIZE
752 - (ia->ia_size & ~PAGE_MASK));
2ed92554 753
13a791b4 754 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
2c27c65e 755 truncate_setsize(inode, ia->ia_size);
5f3ef64f
TH
756 lower_ia->ia_size = ia->ia_size;
757 lower_ia->ia_valid |= ATTR_SIZE;
48c1e44a 758 goto out;
13a791b4 759 }
2ed92554
MH
760 if (num_zeros) {
761 char *zeros_virt;
762
763 zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
764 if (!zeros_virt) {
765 rc = -ENOMEM;
48c1e44a 766 goto out;
2ed92554 767 }
48c1e44a 768 rc = ecryptfs_write(inode, zeros_virt,
5f3ef64f 769 ia->ia_size, num_zeros);
2ed92554 770 kfree(zeros_virt);
5dda6992 771 if (rc) {
240e2df5
MH
772 printk(KERN_ERR "Error attempting to zero out "
773 "the remainder of the end page on "
774 "reducing truncate; rc = [%d]\n", rc);
48c1e44a 775 goto out;
240e2df5
MH
776 }
777 }
2c27c65e 778 truncate_setsize(inode, ia->ia_size);
0216f7f7 779 rc = ecryptfs_write_inode_size_to_metadata(inode);
dd2a3b7a
MH
780 if (rc) {
781 printk(KERN_ERR "Problem with "
782 "ecryptfs_write_inode_size_to_metadata; "
783 "rc = [%d]\n", rc);
48c1e44a 784 goto out;
dd2a3b7a 785 }
237fead6
MH
786 /* We are reducing the size of the ecryptfs file, and need to
787 * know if we need to reduce the size of the lower file. */
788 lower_size_before_truncate =
789 upper_size_to_lower_size(crypt_stat, i_size);
790 lower_size_after_truncate =
5f3ef64f
TH
791 upper_size_to_lower_size(crypt_stat, ia->ia_size);
792 if (lower_size_after_truncate < lower_size_before_truncate) {
793 lower_ia->ia_size = lower_size_after_truncate;
794 lower_ia->ia_valid |= ATTR_SIZE;
795 } else
796 lower_ia->ia_valid &= ~ATTR_SIZE;
237fead6 797 }
237fead6 798out:
332ab16f 799 ecryptfs_put_lower_file(inode);
237fead6
MH
800 return rc;
801}
802
a261a039
TH
803static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset)
804{
805 struct ecryptfs_crypt_stat *crypt_stat;
806 loff_t lower_oldsize, lower_newsize;
807
808 crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
809 lower_oldsize = upper_size_to_lower_size(crypt_stat,
810 i_size_read(inode));
811 lower_newsize = upper_size_to_lower_size(crypt_stat, offset);
812 if (lower_newsize > lower_oldsize) {
813 /*
814 * The eCryptfs inode and the new *lower* size are mixed here
815 * because we may not have the lower i_mutex held and/or it may
816 * not be appropriate to call inode_newsize_ok() with inodes
817 * from other filesystems.
818 */
819 return inode_newsize_ok(inode, lower_newsize);
820 }
821
822 return 0;
823}
824
5f3ef64f
TH
825/**
826 * ecryptfs_truncate
827 * @dentry: The ecryptfs layer dentry
828 * @new_length: The length to expand the file to
829 *
830 * Simple function that handles the truncation of an eCryptfs inode and
831 * its corresponding lower inode.
832 *
833 * Returns zero on success; non-zero otherwise
834 */
835int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
836{
837 struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
838 struct iattr lower_ia = { .ia_valid = 0 };
839 int rc;
840
2b0143b5 841 rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length);
a261a039
TH
842 if (rc)
843 return rc;
844
5f3ef64f
TH
845 rc = truncate_upper(dentry, &ia, &lower_ia);
846 if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
847 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
848
5955102c 849 inode_lock(d_inode(lower_dentry));
27ac0ffe 850 rc = notify_change(lower_dentry, &lower_ia, NULL);
5955102c 851 inode_unlock(d_inode(lower_dentry));
5f3ef64f
TH
852 }
853 return rc;
854}
855
237fead6 856static int
10556cb2 857ecryptfs_permission(struct inode *inode, int mask)
237fead6 858{
f419a2e3 859 return inode_permission(ecryptfs_inode_to_lower(inode), mask);
237fead6
MH
860}
861
862/**
863 * ecryptfs_setattr
864 * @dentry: dentry handle to the inode to modify
865 * @ia: Structure with flags of what to change and values
866 *
867 * Updates the metadata of an inode. If the update is to the size
868 * i.e. truncation, then ecryptfs_truncate will handle the size modification
869 * of both the ecryptfs inode and the lower inode.
870 *
871 * All other metadata changes will be passed right to the lower filesystem,
872 * and we will just update our inode to look like the lower.
873 */
874static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
875{
876 int rc = 0;
877 struct dentry *lower_dentry;
5f3ef64f 878 struct iattr lower_ia;
237fead6
MH
879 struct inode *inode;
880 struct inode *lower_inode;
881 struct ecryptfs_crypt_stat *crypt_stat;
882
2b0143b5 883 crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
e81f3340
HX
884 if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) {
885 rc = ecryptfs_init_crypt_stat(crypt_stat);
886 if (rc)
887 return rc;
888 }
2b0143b5 889 inode = d_inode(dentry);
237fead6 890 lower_inode = ecryptfs_inode_to_lower(inode);
e10f281b
MH
891 lower_dentry = ecryptfs_dentry_to_lower(dentry);
892 mutex_lock(&crypt_stat->cs_mutex);
e36cb0b8 893 if (d_is_dir(dentry))
e10f281b 894 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
e36cb0b8 895 else if (d_is_reg(dentry)
64ee4808
MH
896 && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
897 || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
e10f281b 898 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
e10f281b 899
e10f281b
MH
900 mount_crypt_stat = &ecryptfs_superblock_to_private(
901 dentry->d_sb)->mount_crypt_stat;
3b06b3eb 902 rc = ecryptfs_get_lower_file(dentry, inode);
332ab16f
TH
903 if (rc) {
904 mutex_unlock(&crypt_stat->cs_mutex);
905 goto out;
906 }
d7cdc5fe 907 rc = ecryptfs_read_metadata(dentry);
332ab16f 908 ecryptfs_put_lower_file(inode);
5dda6992 909 if (rc) {
e10f281b
MH
910 if (!(mount_crypt_stat->flags
911 & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
912 rc = -EIO;
25bd8174 913 printk(KERN_WARNING "Either the lower file "
e10f281b 914 "is not in a valid eCryptfs format, "
25bd8174
MH
915 "or the key could not be retrieved. "
916 "Plaintext passthrough mode is not "
e10f281b 917 "enabled; returning -EIO\n");
e10f281b 918 mutex_unlock(&crypt_stat->cs_mutex);
e10f281b
MH
919 goto out;
920 }
921 rc = 0;
3aeb86ea
TH
922 crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
923 | ECRYPTFS_ENCRYPTED);
e10f281b 924 }
e10f281b
MH
925 }
926 mutex_unlock(&crypt_stat->cs_mutex);
a261a039 927
31051c85 928 rc = setattr_prepare(dentry, ia);
a261a039
TH
929 if (rc)
930 goto out;
931 if (ia->ia_valid & ATTR_SIZE) {
932 rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size);
933 if (rc)
934 goto out;
935 }
936
5f3ef64f
TH
937 memcpy(&lower_ia, ia, sizeof(lower_ia));
938 if (ia->ia_valid & ATTR_FILE)
939 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
237fead6 940 if (ia->ia_valid & ATTR_SIZE) {
5f3ef64f 941 rc = truncate_upper(dentry, ia, &lower_ia);
237fead6
MH
942 if (rc < 0)
943 goto out;
944 }
1ac564ec
JL
945
946 /*
947 * mode change is for clearing setuid/setgid bits. Allow lower fs
948 * to interpret this in its own way.
949 */
5f3ef64f
TH
950 if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
951 lower_ia.ia_valid &= ~ATTR_MODE;
1ac564ec 952
5955102c 953 inode_lock(d_inode(lower_dentry));
27ac0ffe 954 rc = notify_change(lower_dentry, &lower_ia, NULL);
5955102c 955 inode_unlock(d_inode(lower_dentry));
237fead6 956out:
9afa2fb6 957 fsstack_copy_attr_all(inode, lower_inode);
237fead6
MH
958 return rc;
959}
960
a528d35e
DH
961static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat,
962 u32 request_mask, unsigned int flags)
3a60a168 963{
a528d35e 964 struct dentry *dentry = path->dentry;
3a60a168
TH
965 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
966 int rc = 0;
967
968 mount_crypt_stat = &ecryptfs_superblock_to_private(
969 dentry->d_sb)->mount_crypt_stat;
2b0143b5 970 generic_fillattr(d_inode(dentry), stat);
3a60a168
TH
971 if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
972 char *target;
973 size_t targetsiz;
974
b22e8fed
AV
975 target = ecryptfs_readlink_lower(dentry, &targetsiz);
976 if (!IS_ERR(target)) {
3a60a168
TH
977 kfree(target);
978 stat->size = targetsiz;
b22e8fed
AV
979 } else {
980 rc = PTR_ERR(target);
3a60a168
TH
981 }
982 }
983 return rc;
984}
985
a528d35e
DH
986static int ecryptfs_getattr(const struct path *path, struct kstat *stat,
987 u32 request_mask, unsigned int flags)
f8f484d1 988{
a528d35e 989 struct dentry *dentry = path->dentry;
f8f484d1
TH
990 struct kstat lower_stat;
991 int rc;
992
a528d35e
DH
993 rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat,
994 request_mask, flags);
f8f484d1 995 if (!rc) {
2b0143b5
DH
996 fsstack_copy_attr_all(d_inode(dentry),
997 ecryptfs_inode_to_lower(d_inode(dentry)));
998 generic_fillattr(d_inode(dentry), stat);
f8f484d1
TH
999 stat->blocks = lower_stat.blocks;
1000 }
1001 return rc;
1002}
1003
dd2a3b7a 1004int
3767e255
AV
1005ecryptfs_setxattr(struct dentry *dentry, struct inode *inode,
1006 const char *name, const void *value,
237fead6
MH
1007 size_t size, int flags)
1008{
5d6c3191 1009 int rc;
237fead6
MH
1010 struct dentry *lower_dentry;
1011
1012 lower_dentry = ecryptfs_dentry_to_lower(dentry);
5d6c3191 1013 if (!(d_inode(lower_dentry)->i_opflags & IOP_XATTR)) {
cfce08c6 1014 rc = -EOPNOTSUPP;
237fead6
MH
1015 goto out;
1016 }
48b512e6 1017 rc = vfs_setxattr(lower_dentry, name, value, size, flags);
3767e255
AV
1018 if (!rc && inode)
1019 fsstack_copy_attr_all(inode, d_inode(lower_dentry));
237fead6
MH
1020out:
1021 return rc;
1022}
1023
d7cdc5fe 1024ssize_t
ce23e640
AV
1025ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode,
1026 const char *name, void *value, size_t size)
d7cdc5fe 1027{
5d6c3191 1028 int rc;
d7cdc5fe 1029
5d6c3191 1030 if (!(lower_inode->i_opflags & IOP_XATTR)) {
cfce08c6 1031 rc = -EOPNOTSUPP;
d7cdc5fe
MH
1032 goto out;
1033 }
ce23e640 1034 inode_lock(lower_inode);
5d6c3191 1035 rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size);
ce23e640 1036 inode_unlock(lower_inode);
d7cdc5fe
MH
1037out:
1038 return rc;
1039}
1040
7896b631 1041static ssize_t
ce23e640
AV
1042ecryptfs_getxattr(struct dentry *dentry, struct inode *inode,
1043 const char *name, void *value, size_t size)
237fead6 1044{
ce23e640
AV
1045 return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry),
1046 ecryptfs_inode_to_lower(inode),
1047 name, value, size);
237fead6
MH
1048}
1049
1050static ssize_t
1051ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1052{
1053 int rc = 0;
1054 struct dentry *lower_dentry;
1055
1056 lower_dentry = ecryptfs_dentry_to_lower(dentry);
2b0143b5 1057 if (!d_inode(lower_dentry)->i_op->listxattr) {
cfce08c6 1058 rc = -EOPNOTSUPP;
237fead6
MH
1059 goto out;
1060 }
5955102c 1061 inode_lock(d_inode(lower_dentry));
2b0143b5 1062 rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size);
5955102c 1063 inode_unlock(d_inode(lower_dentry));
237fead6
MH
1064out:
1065 return rc;
1066}
1067
4b899da5
AG
1068static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode,
1069 const char *name)
237fead6 1070{
5d6c3191 1071 int rc;
237fead6 1072 struct dentry *lower_dentry;
4b899da5 1073 struct inode *lower_inode;
237fead6
MH
1074
1075 lower_dentry = ecryptfs_dentry_to_lower(dentry);
4b899da5 1076 lower_inode = ecryptfs_inode_to_lower(inode);
5d6c3191 1077 if (!(lower_inode->i_opflags & IOP_XATTR)) {
cfce08c6 1078 rc = -EOPNOTSUPP;
237fead6
MH
1079 goto out;
1080 }
4b899da5 1081 inode_lock(lower_inode);
5d6c3191 1082 rc = __vfs_removexattr(lower_dentry, name);
4b899da5 1083 inode_unlock(lower_inode);
237fead6
MH
1084out:
1085 return rc;
1086}
1087
754661f1 1088const struct inode_operations ecryptfs_symlink_iops = {
6b255391 1089 .get_link = ecryptfs_get_link,
237fead6
MH
1090 .permission = ecryptfs_permission,
1091 .setattr = ecryptfs_setattr,
3a60a168 1092 .getattr = ecryptfs_getattr_link,
237fead6 1093 .listxattr = ecryptfs_listxattr,
237fead6
MH
1094};
1095
754661f1 1096const struct inode_operations ecryptfs_dir_iops = {
237fead6
MH
1097 .create = ecryptfs_create,
1098 .lookup = ecryptfs_lookup,
1099 .link = ecryptfs_link,
1100 .unlink = ecryptfs_unlink,
1101 .symlink = ecryptfs_symlink,
1102 .mkdir = ecryptfs_mkdir,
1103 .rmdir = ecryptfs_rmdir,
1104 .mknod = ecryptfs_mknod,
1105 .rename = ecryptfs_rename,
1106 .permission = ecryptfs_permission,
1107 .setattr = ecryptfs_setattr,
237fead6 1108 .listxattr = ecryptfs_listxattr,
237fead6
MH
1109};
1110
754661f1 1111const struct inode_operations ecryptfs_main_iops = {
237fead6
MH
1112 .permission = ecryptfs_permission,
1113 .setattr = ecryptfs_setattr,
f8f484d1 1114 .getattr = ecryptfs_getattr,
237fead6 1115 .listxattr = ecryptfs_listxattr,
4b899da5
AG
1116};
1117
1118static int ecryptfs_xattr_get(const struct xattr_handler *handler,
1119 struct dentry *dentry, struct inode *inode,
1120 const char *name, void *buffer, size_t size)
1121{
1122 return ecryptfs_getxattr(dentry, inode, name, buffer, size);
1123}
1124
1125static int ecryptfs_xattr_set(const struct xattr_handler *handler,
1126 struct dentry *dentry, struct inode *inode,
1127 const char *name, const void *value, size_t size,
1128 int flags)
1129{
1130 if (value)
1131 return ecryptfs_setxattr(dentry, inode, name, value, size, flags);
1132 else {
1133 BUG_ON(flags != XATTR_REPLACE);
1134 return ecryptfs_removexattr(dentry, inode, name);
1135 }
1136}
1137
1138const struct xattr_handler ecryptfs_xattr_handler = {
1139 .prefix = "", /* match anything */
1140 .get = ecryptfs_xattr_get,
1141 .set = ecryptfs_xattr_set,
1142};
1143
1144const struct xattr_handler *ecryptfs_xattr_handlers[] = {
1145 &ecryptfs_xattr_handler,
1146 NULL
237fead6 1147};