Commit | Line | Data |
---|---|---|
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> | |
32 | #include <linux/crypto.h> | |
0cc72dc7 | 33 | #include <linux/fs_stack.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
48b512e6 | 35 | #include <linux/xattr.h> |
0a688ad7 | 36 | #include <asm/unaligned.h> |
237fead6 MH |
37 | #include "ecryptfs_kernel.h" |
38 | ||
39 | static struct dentry *lock_parent(struct dentry *dentry) | |
40 | { | |
41 | struct dentry *dir; | |
42 | ||
8dc4e373 | 43 | dir = dget_parent(dentry); |
908e0a8a | 44 | mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); |
237fead6 MH |
45 | return dir; |
46 | } | |
47 | ||
237fead6 MH |
48 | static void unlock_dir(struct dentry *dir) |
49 | { | |
50 | mutex_unlock(&dir->d_inode->i_mutex); | |
51 | dput(dir); | |
52 | } | |
53 | ||
c4f79073 TH |
54 | static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) |
55 | { | |
56 | if (ecryptfs_inode_to_lower(inode) == (struct inode *)lower_inode) | |
57 | return 1; | |
58 | return 0; | |
59 | } | |
60 | ||
5ccf9203 | 61 | static int ecryptfs_inode_set(struct inode *inode, void *opaque) |
c4f79073 | 62 | { |
5ccf9203 TH |
63 | struct inode *lower_inode = opaque; |
64 | ||
65 | ecryptfs_set_inode_lower(inode, lower_inode); | |
66 | fsstack_copy_attr_all(inode, lower_inode); | |
67 | /* i_size will be overwritten for encrypted regular files */ | |
68 | fsstack_copy_inode_size(inode, lower_inode); | |
69 | inode->i_ino = lower_inode->i_ino; | |
c4f79073 | 70 | inode->i_version++; |
c4f79073 | 71 | inode->i_mapping->a_ops = &ecryptfs_aops; |
5ccf9203 TH |
72 | |
73 | if (S_ISLNK(inode->i_mode)) | |
74 | inode->i_op = &ecryptfs_symlink_iops; | |
75 | else if (S_ISDIR(inode->i_mode)) | |
76 | inode->i_op = &ecryptfs_dir_iops; | |
77 | else | |
78 | inode->i_op = &ecryptfs_main_iops; | |
79 | ||
80 | if (S_ISDIR(inode->i_mode)) | |
81 | inode->i_fop = &ecryptfs_dir_fops; | |
82 | else if (special_file(inode->i_mode)) | |
83 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
84 | else | |
85 | inode->i_fop = &ecryptfs_main_fops; | |
86 | ||
c4f79073 TH |
87 | return 0; |
88 | } | |
89 | ||
5ccf9203 TH |
90 | static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, |
91 | struct super_block *sb) | |
c4f79073 TH |
92 | { |
93 | struct inode *inode; | |
c4f79073 | 94 | |
5ccf9203 TH |
95 | if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) |
96 | return ERR_PTR(-EXDEV); | |
97 | if (!igrab(lower_inode)) | |
98 | return ERR_PTR(-ESTALE); | |
c4f79073 TH |
99 | inode = iget5_locked(sb, (unsigned long)lower_inode, |
100 | ecryptfs_inode_test, ecryptfs_inode_set, | |
101 | lower_inode); | |
102 | if (!inode) { | |
c4f79073 | 103 | iput(lower_inode); |
5ccf9203 | 104 | return ERR_PTR(-EACCES); |
c4f79073 | 105 | } |
5ccf9203 | 106 | if (!(inode->i_state & I_NEW)) |
c4f79073 | 107 | iput(lower_inode); |
5ccf9203 TH |
108 | |
109 | return inode; | |
110 | } | |
111 | ||
112 | struct inode *ecryptfs_get_inode(struct inode *lower_inode, | |
113 | struct super_block *sb) | |
114 | { | |
115 | struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); | |
116 | ||
117 | if (!IS_ERR(inode) && (inode->i_state & I_NEW)) | |
118 | unlock_new_inode(inode); | |
119 | ||
c4f79073 | 120 | return inode; |
c4f79073 TH |
121 | } |
122 | ||
c4f79073 TH |
123 | /** |
124 | * ecryptfs_interpose | |
125 | * @lower_dentry: Existing dentry in the lower filesystem | |
126 | * @dentry: ecryptfs' dentry | |
127 | * @sb: ecryptfs's super_block | |
c4f79073 TH |
128 | * |
129 | * Interposes upper and lower dentries. | |
130 | * | |
131 | * Returns zero on success; non-zero otherwise | |
132 | */ | |
133 | static int ecryptfs_interpose(struct dentry *lower_dentry, | |
5ccf9203 | 134 | struct dentry *dentry, struct super_block *sb) |
c4f79073 | 135 | { |
5ccf9203 TH |
136 | struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb); |
137 | ||
c4f79073 TH |
138 | if (IS_ERR(inode)) |
139 | return PTR_ERR(inode); | |
5ccf9203 TH |
140 | d_instantiate(dentry, inode); |
141 | ||
c4f79073 TH |
142 | return 0; |
143 | } | |
144 | ||
237fead6 MH |
145 | /** |
146 | * ecryptfs_create_underlying_file | |
147 | * @lower_dir_inode: inode of the parent in the lower fs of the new file | |
f70f582f | 148 | * @dentry: New file's dentry |
237fead6 MH |
149 | * @mode: The mode of the new file |
150 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
151 | * | |
152 | * Creates the file in the lower file system. | |
153 | * | |
154 | * Returns zero on success; non-zero on error condition | |
155 | */ | |
156 | static int | |
157 | ecryptfs_create_underlying_file(struct inode *lower_dir_inode, | |
158 | struct dentry *dentry, int mode, | |
159 | struct nameidata *nd) | |
160 | { | |
161 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
162 | struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); | |
163 | struct dentry *dentry_save; | |
164 | struct vfsmount *vfsmount_save; | |
2e21b3f1 | 165 | unsigned int flags_save; |
237fead6 MH |
166 | int rc; |
167 | ||
70b89021 TH |
168 | if (nd) { |
169 | dentry_save = nd->path.dentry; | |
170 | vfsmount_save = nd->path.mnt; | |
171 | flags_save = nd->flags; | |
172 | nd->path.dentry = lower_dentry; | |
173 | nd->path.mnt = lower_mnt; | |
174 | nd->flags &= ~LOOKUP_OPEN; | |
175 | } | |
237fead6 | 176 | rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); |
70b89021 TH |
177 | if (nd) { |
178 | nd->path.dentry = dentry_save; | |
179 | nd->path.mnt = vfsmount_save; | |
180 | nd->flags = flags_save; | |
181 | } | |
237fead6 MH |
182 | return rc; |
183 | } | |
184 | ||
185 | /** | |
186 | * ecryptfs_do_create | |
187 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
188 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
189 | * @mode: The mode of the new file | |
190 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
191 | * | |
192 | * Creates the underlying file and the eCryptfs inode which will link to | |
193 | * it. It will also update the eCryptfs directory inode to mimic the | |
194 | * stat of the lower directory inode. | |
195 | * | |
196 | * Returns zero on success; non-zero on error condition | |
197 | */ | |
198 | static int | |
199 | ecryptfs_do_create(struct inode *directory_inode, | |
200 | struct dentry *ecryptfs_dentry, int mode, | |
201 | struct nameidata *nd) | |
202 | { | |
203 | int rc; | |
204 | struct dentry *lower_dentry; | |
205 | struct dentry *lower_dir_dentry; | |
206 | ||
207 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
208 | lower_dir_dentry = lock_parent(lower_dentry); | |
801678c5 | 209 | if (IS_ERR(lower_dir_dentry)) { |
237fead6 MH |
210 | ecryptfs_printk(KERN_ERR, "Error locking directory of " |
211 | "dentry\n"); | |
212 | rc = PTR_ERR(lower_dir_dentry); | |
213 | goto out; | |
214 | } | |
215 | rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, | |
216 | ecryptfs_dentry, mode, nd); | |
4981e081 | 217 | if (rc) { |
caeeeecf | 218 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 219 | "rc = [%d]\n", __func__, rc); |
caeeeecf | 220 | goto out_lock; |
237fead6 MH |
221 | } |
222 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, | |
5ccf9203 | 223 | directory_inode->i_sb); |
237fead6 MH |
224 | if (rc) { |
225 | ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); | |
226 | goto out_lock; | |
227 | } | |
0cc72dc7 JJS |
228 | fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); |
229 | fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); | |
237fead6 MH |
230 | out_lock: |
231 | unlock_dir(lower_dir_dentry); | |
232 | out: | |
233 | return rc; | |
234 | } | |
235 | ||
237fead6 MH |
236 | /** |
237 | * ecryptfs_initialize_file | |
238 | * | |
239 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
240 | * file with a header and first data page. | |
241 | * | |
242 | * Returns zero on success | |
243 | */ | |
244 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) | |
245 | { | |
d7cdc5fe MH |
246 | struct ecryptfs_crypt_stat *crypt_stat = |
247 | &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; | |
237fead6 | 248 | int rc = 0; |
237fead6 | 249 | |
237fead6 MH |
250 | if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { |
251 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); | |
e2bd99ec | 252 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 253 | goto out; |
237fead6 | 254 | } |
237fead6 MH |
255 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
256 | rc = ecryptfs_new_file_context(ecryptfs_dentry); | |
257 | if (rc) { | |
d7cdc5fe MH |
258 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
259 | "context; rc = [%d]\n", rc); | |
260 | goto out; | |
237fead6 | 261 | } |
3b06b3eb TH |
262 | rc = ecryptfs_get_lower_file(ecryptfs_dentry, |
263 | ecryptfs_dentry->d_inode); | |
27992890 RS |
264 | if (rc) { |
265 | printk(KERN_ERR "%s: Error attempting to initialize " | |
332ab16f | 266 | "the lower file for the dentry with name " |
27992890 RS |
267 | "[%s]; rc = [%d]\n", __func__, |
268 | ecryptfs_dentry->d_name.name, rc); | |
269 | goto out; | |
391b52f9 | 270 | } |
d7cdc5fe | 271 | rc = ecryptfs_write_metadata(ecryptfs_dentry); |
332ab16f | 272 | if (rc) |
d7cdc5fe | 273 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
332ab16f | 274 | ecryptfs_put_lower_file(ecryptfs_dentry->d_inode); |
237fead6 MH |
275 | out: |
276 | return rc; | |
277 | } | |
278 | ||
279 | /** | |
280 | * ecryptfs_create | |
281 | * @dir: The inode of the directory in which to create the file. | |
282 | * @dentry: The eCryptfs dentry | |
283 | * @mode: The mode of the new file. | |
284 | * @nd: nameidata | |
285 | * | |
286 | * Creates a new file. | |
287 | * | |
288 | * Returns zero on success; non-zero on error condition | |
289 | */ | |
290 | static int | |
291 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
292 | int mode, struct nameidata *nd) | |
293 | { | |
294 | int rc; | |
295 | ||
addd65ad | 296 | /* ecryptfs_do_create() calls ecryptfs_interpose() */ |
237fead6 MH |
297 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); |
298 | if (unlikely(rc)) { | |
299 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" | |
300 | "lower filesystem\n"); | |
301 | goto out; | |
302 | } | |
303 | /* At this point, a file exists on "disk"; we need to make sure | |
304 | * that this on disk file is prepared to be an ecryptfs file */ | |
305 | rc = ecryptfs_initialize_file(ecryptfs_dentry); | |
306 | out: | |
307 | return rc; | |
308 | } | |
309 | ||
778aeb42 TH |
310 | static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) |
311 | { | |
312 | struct ecryptfs_crypt_stat *crypt_stat; | |
313 | int rc; | |
314 | ||
315 | rc = ecryptfs_get_lower_file(dentry, inode); | |
316 | if (rc) { | |
317 | printk(KERN_ERR "%s: Error attempting to initialize " | |
318 | "the lower file for the dentry with name " | |
319 | "[%s]; rc = [%d]\n", __func__, | |
320 | dentry->d_name.name, rc); | |
321 | return rc; | |
322 | } | |
323 | ||
324 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
325 | /* TODO: lock for crypt_stat comparison */ | |
326 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
327 | ecryptfs_set_default_sizes(crypt_stat); | |
328 | ||
329 | rc = ecryptfs_read_and_validate_header_region(inode); | |
330 | ecryptfs_put_lower_file(inode); | |
331 | if (rc) { | |
332 | rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); | |
333 | if (!rc) | |
334 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; | |
335 | } | |
336 | ||
337 | /* Must return 0 to allow non-eCryptfs files to be looked up, too */ | |
338 | return 0; | |
339 | } | |
340 | ||
237fead6 | 341 | /** |
5ccf9203 | 342 | * ecryptfs_lookup_interpose - Dentry interposition for a lookup |
237fead6 | 343 | */ |
778aeb42 | 344 | static int ecryptfs_lookup_interpose(struct dentry *dentry, |
5ccf9203 | 345 | struct dentry *lower_dentry, |
778aeb42 | 346 | struct inode *dir_inode) |
237fead6 | 347 | { |
778aeb42 TH |
348 | struct inode *inode, *lower_inode = lower_dentry->d_inode; |
349 | struct ecryptfs_dentry_info *dentry_info; | |
237fead6 | 350 | struct vfsmount *lower_mnt; |
778aeb42 TH |
351 | int rc = 0; |
352 | ||
353 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); | |
354 | fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode); | |
b7ab39f6 | 355 | BUG_ON(!lower_dentry->d_count); |
778aeb42 TH |
356 | |
357 | dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); | |
358 | ecryptfs_set_dentry_private(dentry, dentry_info); | |
359 | if (!dentry_info) { | |
addd65ad MH |
360 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
361 | "to allocate ecryptfs_dentry_info struct\n", | |
362 | __func__); | |
778aeb42 TH |
363 | dput(lower_dentry); |
364 | mntput(lower_mnt); | |
365 | d_drop(dentry); | |
366 | return -ENOMEM; | |
237fead6 | 367 | } |
778aeb42 TH |
368 | ecryptfs_set_dentry_lower(dentry, lower_dentry); |
369 | ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); | |
370 | ||
237fead6 MH |
371 | if (!lower_dentry->d_inode) { |
372 | /* We want to add because we couldn't find in lower */ | |
778aeb42 TH |
373 | d_add(dentry, NULL); |
374 | return 0; | |
237fead6 | 375 | } |
778aeb42 | 376 | inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); |
5ccf9203 | 377 | if (IS_ERR(inode)) { |
778aeb42 TH |
378 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", |
379 | __func__, PTR_ERR(inode)); | |
380 | return PTR_ERR(inode); | |
391b52f9 | 381 | } |
778aeb42 TH |
382 | if (S_ISREG(inode->i_mode)) { |
383 | rc = ecryptfs_i_size_read(dentry, inode); | |
dd2a3b7a | 384 | if (rc) { |
778aeb42 TH |
385 | make_bad_inode(inode); |
386 | return rc; | |
237fead6 | 387 | } |
237fead6 | 388 | } |
778aeb42 | 389 | |
3b06b3eb TH |
390 | if (inode->i_state & I_NEW) |
391 | unlock_new_inode(inode); | |
778aeb42 TH |
392 | d_add(dentry, inode); |
393 | ||
addd65ad MH |
394 | return rc; |
395 | } | |
396 | ||
397 | /** | |
398 | * ecryptfs_lookup | |
399 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
400 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
401 | * @ecryptfs_nd: nameidata; may be NULL | |
402 | * | |
403 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
404 | * dentry cache and continue on to read it from the disk. | |
405 | */ | |
406 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
407 | struct dentry *ecryptfs_dentry, | |
408 | struct nameidata *ecryptfs_nd) | |
409 | { | |
410 | char *encrypted_and_encoded_name = NULL; | |
a8f12864 | 411 | size_t encrypted_and_encoded_name_size; |
addd65ad | 412 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
addd65ad MH |
413 | struct dentry *lower_dir_dentry, *lower_dentry; |
414 | int rc = 0; | |
415 | ||
addd65ad MH |
416 | if ((ecryptfs_dentry->d_name.len == 1 |
417 | && !strcmp(ecryptfs_dentry->d_name.name, ".")) | |
418 | || (ecryptfs_dentry->d_name.len == 2 | |
419 | && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { | |
420 | goto out_d_drop; | |
421 | } | |
422 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); | |
8787c7a3 TH |
423 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
424 | lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, | |
425 | lower_dir_dentry, | |
426 | ecryptfs_dentry->d_name.len); | |
427 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
428 | if (IS_ERR(lower_dentry)) { |
429 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 430 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
431 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
432 | encrypted_and_encoded_name); | |
addd65ad MH |
433 | goto out_d_drop; |
434 | } | |
435 | if (lower_dentry->d_inode) | |
5ccf9203 | 436 | goto interpose; |
2aac0cf8 TH |
437 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
438 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
439 | if (!(mount_crypt_stat | |
440 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) | |
5ccf9203 | 441 | goto interpose; |
addd65ad MH |
442 | dput(lower_dentry); |
443 | rc = ecryptfs_encrypt_and_encode_filename( | |
444 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, | |
2aac0cf8 | 445 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
addd65ad MH |
446 | ecryptfs_dentry->d_name.len); |
447 | if (rc) { | |
448 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
449 | "filename; rc = [%d]\n", __func__, rc); | |
450 | goto out_d_drop; | |
451 | } | |
8787c7a3 TH |
452 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
453 | lower_dentry = lookup_one_len(encrypted_and_encoded_name, | |
454 | lower_dir_dentry, | |
455 | encrypted_and_encoded_name_size); | |
456 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
457 | if (IS_ERR(lower_dentry)) { |
458 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 459 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
460 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
461 | encrypted_and_encoded_name); | |
addd65ad MH |
462 | goto out_d_drop; |
463 | } | |
5ccf9203 TH |
464 | interpose: |
465 | rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, | |
466 | ecryptfs_dir_inode); | |
addd65ad MH |
467 | goto out; |
468 | out_d_drop: | |
469 | d_drop(ecryptfs_dentry); | |
237fead6 | 470 | out: |
addd65ad | 471 | kfree(encrypted_and_encoded_name); |
237fead6 MH |
472 | return ERR_PTR(rc); |
473 | } | |
474 | ||
475 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
476 | struct dentry *new_dentry) | |
477 | { | |
478 | struct dentry *lower_old_dentry; | |
479 | struct dentry *lower_new_dentry; | |
480 | struct dentry *lower_dir_dentry; | |
481 | u64 file_size_save; | |
482 | int rc; | |
483 | ||
484 | file_size_save = i_size_read(old_dentry->d_inode); | |
485 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
486 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
487 | dget(lower_old_dentry); | |
488 | dget(lower_new_dentry); | |
489 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
490 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
491 | lower_new_dentry); | |
492 | if (rc || !lower_new_dentry->d_inode) | |
493 | goto out_lock; | |
5ccf9203 | 494 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
237fead6 MH |
495 | if (rc) |
496 | goto out_lock; | |
3a8380c0 TH |
497 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
498 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
499 | old_dentry->d_inode->i_nlink = |
500 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; | |
501 | i_size_write(new_dentry->d_inode, file_size_save); | |
502 | out_lock: | |
503 | unlock_dir(lower_dir_dentry); | |
504 | dput(lower_new_dentry); | |
505 | dput(lower_old_dentry); | |
237fead6 MH |
506 | return rc; |
507 | } | |
508 | ||
509 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
510 | { | |
511 | int rc = 0; | |
512 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
513 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
8dc4e373 | 514 | struct dentry *lower_dir_dentry; |
237fead6 | 515 | |
9c2d2056 | 516 | dget(lower_dentry); |
8dc4e373 | 517 | lower_dir_dentry = lock_parent(lower_dentry); |
237fead6 MH |
518 | rc = vfs_unlink(lower_dir_inode, lower_dentry); |
519 | if (rc) { | |
ae56fb16 | 520 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
521 | goto out_unlock; |
522 | } | |
0cc72dc7 | 523 | fsstack_copy_attr_times(dir, lower_dir_inode); |
237fead6 MH |
524 | dentry->d_inode->i_nlink = |
525 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; | |
526 | dentry->d_inode->i_ctime = dir->i_ctime; | |
caeeeecf | 527 | d_drop(dentry); |
237fead6 | 528 | out_unlock: |
8dc4e373 | 529 | unlock_dir(lower_dir_dentry); |
9c2d2056 | 530 | dput(lower_dentry); |
237fead6 MH |
531 | return rc; |
532 | } | |
533 | ||
534 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
535 | const char *symname) | |
536 | { | |
537 | int rc; | |
538 | struct dentry *lower_dentry; | |
539 | struct dentry *lower_dir_dentry; | |
237fead6 | 540 | char *encoded_symname; |
addd65ad MH |
541 | size_t encoded_symlen; |
542 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
543 | |
544 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
545 | dget(lower_dentry); | |
546 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
547 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
548 | dir->i_sb)->mount_crypt_stat; | |
549 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
550 | &encoded_symlen, | |
551 | NULL, | |
552 | mount_crypt_stat, symname, | |
553 | strlen(symname)); | |
554 | if (rc) | |
237fead6 | 555 | goto out_lock; |
237fead6 | 556 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, |
db2e747b | 557 | encoded_symname); |
237fead6 MH |
558 | kfree(encoded_symname); |
559 | if (rc || !lower_dentry->d_inode) | |
560 | goto out_lock; | |
5ccf9203 | 561 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
562 | if (rc) |
563 | goto out_lock; | |
0cc72dc7 JJS |
564 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
565 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
566 | out_lock: |
567 | unlock_dir(lower_dir_dentry); | |
568 | dput(lower_dentry); | |
569 | if (!dentry->d_inode) | |
570 | d_drop(dentry); | |
571 | return rc; | |
572 | } | |
573 | ||
574 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
575 | { | |
576 | int rc; | |
577 | struct dentry *lower_dentry; | |
578 | struct dentry *lower_dir_dentry; | |
579 | ||
580 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
581 | lower_dir_dentry = lock_parent(lower_dentry); | |
582 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
583 | if (rc || !lower_dentry->d_inode) | |
584 | goto out; | |
5ccf9203 | 585 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
586 | if (rc) |
587 | goto out; | |
0cc72dc7 JJS |
588 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
589 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
590 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
591 | out: | |
592 | unlock_dir(lower_dir_dentry); | |
593 | if (!dentry->d_inode) | |
594 | d_drop(dentry); | |
595 | return rc; | |
596 | } | |
597 | ||
598 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
599 | { | |
237fead6 | 600 | struct dentry *lower_dentry; |
237fead6 | 601 | struct dentry *lower_dir_dentry; |
45ec4aba | 602 | int rc; |
237fead6 MH |
603 | |
604 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 605 | dget(dentry); |
237fead6 | 606 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 607 | dget(lower_dentry); |
237fead6 | 608 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba | 609 | dput(lower_dentry); |
07850552 TH |
610 | if (!rc && dentry->d_inode) |
611 | clear_nlink(dentry->d_inode); | |
0cc72dc7 | 612 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
613 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
614 | unlock_dir(lower_dir_dentry); | |
615 | if (!rc) | |
616 | d_drop(dentry); | |
45ec4aba | 617 | dput(dentry); |
237fead6 MH |
618 | return rc; |
619 | } | |
620 | ||
621 | static int | |
622 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
623 | { | |
624 | int rc; | |
625 | struct dentry *lower_dentry; | |
626 | struct dentry *lower_dir_dentry; | |
627 | ||
628 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
629 | lower_dir_dentry = lock_parent(lower_dentry); | |
630 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
631 | if (rc || !lower_dentry->d_inode) | |
632 | goto out; | |
5ccf9203 | 633 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
634 | if (rc) |
635 | goto out; | |
0cc72dc7 JJS |
636 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
637 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
638 | out: |
639 | unlock_dir(lower_dir_dentry); | |
640 | if (!dentry->d_inode) | |
641 | d_drop(dentry); | |
642 | return rc; | |
643 | } | |
644 | ||
645 | static int | |
646 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
647 | struct inode *new_dir, struct dentry *new_dentry) | |
648 | { | |
649 | int rc; | |
650 | struct dentry *lower_old_dentry; | |
651 | struct dentry *lower_new_dentry; | |
652 | struct dentry *lower_old_dir_dentry; | |
653 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 654 | struct dentry *trap = NULL; |
237fead6 MH |
655 | |
656 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
657 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
658 | dget(lower_old_dentry); | |
659 | dget(lower_new_dentry); | |
660 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
661 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
0d132f73 EZ |
662 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
663 | /* source should not be ancestor of target */ | |
664 | if (trap == lower_old_dentry) { | |
665 | rc = -EINVAL; | |
666 | goto out_lock; | |
667 | } | |
668 | /* target should not be ancestor of source */ | |
669 | if (trap == lower_new_dentry) { | |
670 | rc = -ENOTEMPTY; | |
671 | goto out_lock; | |
672 | } | |
237fead6 MH |
673 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, |
674 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
675 | if (rc) | |
676 | goto out_lock; | |
9afa2fb6 | 677 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); |
237fead6 | 678 | if (new_dir != old_dir) |
9afa2fb6 | 679 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); |
237fead6 MH |
680 | out_lock: |
681 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
dd55c898 TH |
682 | dput(lower_new_dir_dentry); |
683 | dput(lower_old_dir_dentry); | |
237fead6 MH |
684 | dput(lower_new_dentry); |
685 | dput(lower_old_dentry); | |
686 | return rc; | |
687 | } | |
688 | ||
3a60a168 TH |
689 | static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, |
690 | size_t *bufsiz) | |
237fead6 | 691 | { |
3a60a168 | 692 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
237fead6 | 693 | char *lower_buf; |
3a60a168 | 694 | size_t lower_bufsiz = PATH_MAX; |
addd65ad MH |
695 | mm_segment_t old_fs; |
696 | int rc; | |
237fead6 | 697 | |
3a6b42ca | 698 | lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); |
3a60a168 | 699 | if (!lower_buf) { |
237fead6 MH |
700 | rc = -ENOMEM; |
701 | goto out; | |
702 | } | |
703 | old_fs = get_fs(); | |
704 | set_fs(get_ds()); | |
237fead6 MH |
705 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, |
706 | (char __user *)lower_buf, | |
3a6b42ca | 707 | lower_bufsiz); |
237fead6 | 708 | set_fs(old_fs); |
3a60a168 TH |
709 | if (rc < 0) |
710 | goto out; | |
711 | lower_bufsiz = rc; | |
712 | rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, | |
713 | lower_buf, lower_bufsiz); | |
714 | out: | |
237fead6 | 715 | kfree(lower_buf); |
3a60a168 TH |
716 | return rc; |
717 | } | |
718 | ||
719 | static int | |
720 | ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) | |
721 | { | |
722 | char *kbuf; | |
723 | size_t kbufsiz, copied; | |
724 | int rc; | |
725 | ||
726 | rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); | |
727 | if (rc) | |
728 | goto out; | |
729 | copied = min_t(size_t, bufsiz, kbufsiz); | |
730 | rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; | |
731 | kfree(kbuf); | |
732 | fsstack_copy_attr_atime(dentry->d_inode, | |
733 | ecryptfs_dentry_to_lower(dentry)->d_inode); | |
237fead6 MH |
734 | out: |
735 | return rc; | |
736 | } | |
737 | ||
738 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
739 | { | |
740 | char *buf; | |
741 | int len = PAGE_SIZE, rc; | |
742 | mm_segment_t old_fs; | |
743 | ||
744 | /* Released in ecryptfs_put_link(); only release here on error */ | |
745 | buf = kmalloc(len, GFP_KERNEL); | |
746 | if (!buf) { | |
806892e9 | 747 | buf = ERR_PTR(-ENOMEM); |
237fead6 MH |
748 | goto out; |
749 | } | |
750 | old_fs = get_fs(); | |
751 | set_fs(get_ds()); | |
237fead6 | 752 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); |
237fead6 | 753 | set_fs(old_fs); |
806892e9 OH |
754 | if (rc < 0) { |
755 | kfree(buf); | |
756 | buf = ERR_PTR(rc); | |
757 | } else | |
a17d5232 | 758 | buf[rc] = '\0'; |
237fead6 | 759 | out: |
806892e9 OH |
760 | nd_set_link(nd, buf); |
761 | return NULL; | |
237fead6 MH |
762 | } |
763 | ||
764 | static void | |
765 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
766 | { | |
806892e9 OH |
767 | char *buf = nd_get_link(nd); |
768 | if (!IS_ERR(buf)) { | |
769 | /* Free the char* */ | |
770 | kfree(buf); | |
771 | } | |
237fead6 MH |
772 | } |
773 | ||
774 | /** | |
775 | * upper_size_to_lower_size | |
776 | * @crypt_stat: Crypt_stat associated with file | |
777 | * @upper_size: Size of the upper file | |
778 | * | |
cc11beff | 779 | * Calculate the required size of the lower file based on the |
237fead6 MH |
780 | * specified size of the upper file. This calculation is based on the |
781 | * number of headers in the underlying file and the extent size. | |
782 | * | |
783 | * Returns Calculated size of the lower file. | |
784 | */ | |
785 | static loff_t | |
786 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
787 | loff_t upper_size) | |
788 | { | |
789 | loff_t lower_size; | |
790 | ||
157f1071 | 791 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
792 | if (upper_size != 0) { |
793 | loff_t num_extents; | |
794 | ||
795 | num_extents = upper_size >> crypt_stat->extent_shift; | |
796 | if (upper_size & ~crypt_stat->extent_mask) | |
797 | num_extents++; | |
798 | lower_size += (num_extents * crypt_stat->extent_size); | |
799 | } | |
800 | return lower_size; | |
801 | } | |
802 | ||
803 | /** | |
5f3ef64f | 804 | * truncate_upper |
237fead6 | 805 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
806 | * @ia: Address of the ecryptfs inode's attributes |
807 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
808 | * |
809 | * Function to handle truncations modifying the size of the file. Note | |
810 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
811 | * writing strings of 0's out. When truncating, we truncate the upper |
812 | * inode and update the lower_ia according to the page index | |
813 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
814 | * the caller must use lower_ia in a call to notify_change() to perform | |
815 | * the truncation of the lower inode. | |
237fead6 MH |
816 | * |
817 | * Returns zero on success; non-zero otherwise | |
818 | */ | |
5f3ef64f TH |
819 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
820 | struct iattr *lower_ia) | |
237fead6 MH |
821 | { |
822 | int rc = 0; | |
823 | struct inode *inode = dentry->d_inode; | |
237fead6 MH |
824 | struct ecryptfs_crypt_stat *crypt_stat; |
825 | loff_t i_size = i_size_read(inode); | |
826 | loff_t lower_size_before_truncate; | |
827 | loff_t lower_size_after_truncate; | |
828 | ||
5f3ef64f TH |
829 | if (unlikely((ia->ia_size == i_size))) { |
830 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 831 | return 0; |
5f3ef64f | 832 | } |
3b06b3eb | 833 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
834 | if (rc) |
835 | return rc; | |
237fead6 | 836 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
237fead6 | 837 | /* Switch on growing or shrinking file */ |
5f3ef64f | 838 | if (ia->ia_size > i_size) { |
2ed92554 MH |
839 | char zero[] = { 0x00 }; |
840 | ||
5f3ef64f | 841 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
842 | /* Write a single 0 at the last position of the file; |
843 | * this triggers code that will fill in 0's throughout | |
844 | * the intermediate portion of the previous end of the | |
845 | * file and the new and of the file */ | |
48c1e44a | 846 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
847 | (ia->ia_size - 1), 1); |
848 | } else { /* ia->ia_size < i_size_read(inode) */ | |
849 | /* We're chopping off all the pages down to the page | |
850 | * in which ia->ia_size is located. Fill in the end of | |
851 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to | |
2ed92554 MH |
852 | * PAGE_CACHE_SIZE with zeros. */ |
853 | size_t num_zeros = (PAGE_CACHE_SIZE | |
5f3ef64f | 854 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
2ed92554 | 855 | |
2c27c65e CH |
856 | |
857 | /* | |
858 | * XXX(truncate) this should really happen at the begginning | |
859 | * of ->setattr. But the code is too messy to that as part | |
860 | * of a larger patch. ecryptfs is also totally missing out | |
861 | * on the inode_change_ok check at the beginning of | |
862 | * ->setattr while would include this. | |
863 | */ | |
864 | rc = inode_newsize_ok(inode, ia->ia_size); | |
865 | if (rc) | |
866 | goto out; | |
867 | ||
13a791b4 | 868 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 869 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
870 | lower_ia->ia_size = ia->ia_size; |
871 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 872 | goto out; |
13a791b4 | 873 | } |
2ed92554 MH |
874 | if (num_zeros) { |
875 | char *zeros_virt; | |
876 | ||
877 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
878 | if (!zeros_virt) { | |
879 | rc = -ENOMEM; | |
48c1e44a | 880 | goto out; |
2ed92554 | 881 | } |
48c1e44a | 882 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 883 | ia->ia_size, num_zeros); |
2ed92554 | 884 | kfree(zeros_virt); |
5dda6992 | 885 | if (rc) { |
240e2df5 MH |
886 | printk(KERN_ERR "Error attempting to zero out " |
887 | "the remainder of the end page on " | |
888 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 889 | goto out; |
240e2df5 MH |
890 | } |
891 | } | |
2c27c65e | 892 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 893 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
894 | if (rc) { |
895 | printk(KERN_ERR "Problem with " | |
896 | "ecryptfs_write_inode_size_to_metadata; " | |
897 | "rc = [%d]\n", rc); | |
48c1e44a | 898 | goto out; |
dd2a3b7a | 899 | } |
237fead6 MH |
900 | /* We are reducing the size of the ecryptfs file, and need to |
901 | * know if we need to reduce the size of the lower file. */ | |
902 | lower_size_before_truncate = | |
903 | upper_size_to_lower_size(crypt_stat, i_size); | |
904 | lower_size_after_truncate = | |
5f3ef64f TH |
905 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
906 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
907 | lower_ia->ia_size = lower_size_after_truncate; | |
908 | lower_ia->ia_valid |= ATTR_SIZE; | |
909 | } else | |
910 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 911 | } |
237fead6 | 912 | out: |
332ab16f | 913 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
914 | return rc; |
915 | } | |
916 | ||
5f3ef64f TH |
917 | /** |
918 | * ecryptfs_truncate | |
919 | * @dentry: The ecryptfs layer dentry | |
920 | * @new_length: The length to expand the file to | |
921 | * | |
922 | * Simple function that handles the truncation of an eCryptfs inode and | |
923 | * its corresponding lower inode. | |
924 | * | |
925 | * Returns zero on success; non-zero otherwise | |
926 | */ | |
927 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
928 | { | |
929 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
930 | struct iattr lower_ia = { .ia_valid = 0 }; | |
931 | int rc; | |
932 | ||
933 | rc = truncate_upper(dentry, &ia, &lower_ia); | |
934 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
935 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
936 | ||
937 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
938 | rc = notify_change(lower_dentry, &lower_ia); | |
939 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
940 | } | |
941 | return rc; | |
942 | } | |
943 | ||
237fead6 | 944 | static int |
b74c79e9 | 945 | ecryptfs_permission(struct inode *inode, int mask, unsigned int flags) |
237fead6 | 946 | { |
b74c79e9 NP |
947 | if (flags & IPERM_FLAG_RCU) |
948 | return -ECHILD; | |
f419a2e3 | 949 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
950 | } |
951 | ||
952 | /** | |
953 | * ecryptfs_setattr | |
954 | * @dentry: dentry handle to the inode to modify | |
955 | * @ia: Structure with flags of what to change and values | |
956 | * | |
957 | * Updates the metadata of an inode. If the update is to the size | |
958 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
959 | * of both the ecryptfs inode and the lower inode. | |
960 | * | |
961 | * All other metadata changes will be passed right to the lower filesystem, | |
962 | * and we will just update our inode to look like the lower. | |
963 | */ | |
964 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
965 | { | |
966 | int rc = 0; | |
967 | struct dentry *lower_dentry; | |
5f3ef64f | 968 | struct iattr lower_ia; |
237fead6 MH |
969 | struct inode *inode; |
970 | struct inode *lower_inode; | |
971 | struct ecryptfs_crypt_stat *crypt_stat; | |
972 | ||
973 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
974 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
975 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
976 | inode = dentry->d_inode; |
977 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
978 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
979 | mutex_lock(&crypt_stat->cs_mutex); | |
980 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
981 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
982 | else if (S_ISREG(dentry->d_inode->i_mode) |
983 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
984 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 985 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 986 | |
e10f281b MH |
987 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
988 | dentry->d_sb)->mount_crypt_stat; | |
3b06b3eb | 989 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
990 | if (rc) { |
991 | mutex_unlock(&crypt_stat->cs_mutex); | |
992 | goto out; | |
993 | } | |
d7cdc5fe | 994 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 995 | ecryptfs_put_lower_file(inode); |
5dda6992 | 996 | if (rc) { |
e10f281b MH |
997 | if (!(mount_crypt_stat->flags |
998 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
999 | rc = -EIO; | |
25bd8174 | 1000 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 1001 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
1002 | "or the key could not be retrieved. " |
1003 | "Plaintext passthrough mode is not " | |
e10f281b | 1004 | "enabled; returning -EIO\n"); |
e10f281b | 1005 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
1006 | goto out; |
1007 | } | |
1008 | rc = 0; | |
3aeb86ea TH |
1009 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
1010 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 1011 | } |
e10f281b MH |
1012 | } |
1013 | mutex_unlock(&crypt_stat->cs_mutex); | |
5be79de2 TH |
1014 | if (S_ISREG(inode->i_mode)) { |
1015 | rc = filemap_write_and_wait(inode->i_mapping); | |
1016 | if (rc) | |
1017 | goto out; | |
1018 | fsstack_copy_attr_all(inode, lower_inode); | |
1019 | } | |
5f3ef64f TH |
1020 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
1021 | if (ia->ia_valid & ATTR_FILE) | |
1022 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 1023 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 1024 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
1025 | if (rc < 0) |
1026 | goto out; | |
1027 | } | |
1ac564ec JL |
1028 | |
1029 | /* | |
1030 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
1031 | * to interpret this in its own way. | |
1032 | */ | |
5f3ef64f TH |
1033 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
1034 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 1035 | |
9c3580aa | 1036 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
5f3ef64f | 1037 | rc = notify_change(lower_dentry, &lower_ia); |
9c3580aa | 1038 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
237fead6 | 1039 | out: |
9afa2fb6 | 1040 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
1041 | return rc; |
1042 | } | |
1043 | ||
3a60a168 TH |
1044 | int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
1045 | struct kstat *stat) | |
1046 | { | |
1047 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; | |
1048 | int rc = 0; | |
1049 | ||
1050 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
1051 | dentry->d_sb)->mount_crypt_stat; | |
1052 | generic_fillattr(dentry->d_inode, stat); | |
1053 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { | |
1054 | char *target; | |
1055 | size_t targetsiz; | |
1056 | ||
1057 | rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); | |
1058 | if (!rc) { | |
1059 | kfree(target); | |
1060 | stat->size = targetsiz; | |
1061 | } | |
1062 | } | |
1063 | return rc; | |
1064 | } | |
1065 | ||
f8f484d1 TH |
1066 | int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1067 | struct kstat *stat) | |
1068 | { | |
1069 | struct kstat lower_stat; | |
1070 | int rc; | |
1071 | ||
1072 | rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), | |
1073 | ecryptfs_dentry_to_lower(dentry), &lower_stat); | |
1074 | if (!rc) { | |
55f9cf6b TH |
1075 | fsstack_copy_attr_all(dentry->d_inode, |
1076 | ecryptfs_inode_to_lower(dentry->d_inode)); | |
f8f484d1 TH |
1077 | generic_fillattr(dentry->d_inode, stat); |
1078 | stat->blocks = lower_stat.blocks; | |
1079 | } | |
1080 | return rc; | |
1081 | } | |
1082 | ||
dd2a3b7a | 1083 | int |
237fead6 MH |
1084 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
1085 | size_t size, int flags) | |
1086 | { | |
1087 | int rc = 0; | |
1088 | struct dentry *lower_dentry; | |
1089 | ||
1090 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1091 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
cfce08c6 | 1092 | rc = -EOPNOTSUPP; |
237fead6 MH |
1093 | goto out; |
1094 | } | |
48b512e6 RS |
1095 | |
1096 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); | |
237fead6 MH |
1097 | out: |
1098 | return rc; | |
1099 | } | |
1100 | ||
d7cdc5fe MH |
1101 | ssize_t |
1102 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
1103 | void *value, size_t size) | |
1104 | { | |
1105 | int rc = 0; | |
1106 | ||
1107 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
cfce08c6 | 1108 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1109 | goto out; |
1110 | } | |
1111 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1112 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
1113 | size); | |
1114 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1115 | out: | |
1116 | return rc; | |
1117 | } | |
1118 | ||
7896b631 | 1119 | static ssize_t |
237fead6 MH |
1120 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
1121 | size_t size) | |
1122 | { | |
2ed92554 MH |
1123 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
1124 | value, size); | |
237fead6 MH |
1125 | } |
1126 | ||
1127 | static ssize_t | |
1128 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1129 | { | |
1130 | int rc = 0; | |
1131 | struct dentry *lower_dentry; | |
1132 | ||
1133 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1134 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
cfce08c6 | 1135 | rc = -EOPNOTSUPP; |
237fead6 MH |
1136 | goto out; |
1137 | } | |
1138 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1139 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
1140 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1141 | out: | |
1142 | return rc; | |
1143 | } | |
1144 | ||
1145 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
1146 | { | |
1147 | int rc = 0; | |
1148 | struct dentry *lower_dentry; | |
1149 | ||
1150 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1151 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
cfce08c6 | 1152 | rc = -EOPNOTSUPP; |
237fead6 MH |
1153 | goto out; |
1154 | } | |
1155 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1156 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
1157 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1158 | out: | |
1159 | return rc; | |
1160 | } | |
1161 | ||
754661f1 | 1162 | const struct inode_operations ecryptfs_symlink_iops = { |
237fead6 MH |
1163 | .readlink = ecryptfs_readlink, |
1164 | .follow_link = ecryptfs_follow_link, | |
1165 | .put_link = ecryptfs_put_link, | |
1166 | .permission = ecryptfs_permission, | |
1167 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1168 | .getattr = ecryptfs_getattr_link, |
237fead6 MH |
1169 | .setxattr = ecryptfs_setxattr, |
1170 | .getxattr = ecryptfs_getxattr, | |
1171 | .listxattr = ecryptfs_listxattr, | |
1172 | .removexattr = ecryptfs_removexattr | |
1173 | }; | |
1174 | ||
754661f1 | 1175 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1176 | .create = ecryptfs_create, |
1177 | .lookup = ecryptfs_lookup, | |
1178 | .link = ecryptfs_link, | |
1179 | .unlink = ecryptfs_unlink, | |
1180 | .symlink = ecryptfs_symlink, | |
1181 | .mkdir = ecryptfs_mkdir, | |
1182 | .rmdir = ecryptfs_rmdir, | |
1183 | .mknod = ecryptfs_mknod, | |
1184 | .rename = ecryptfs_rename, | |
1185 | .permission = ecryptfs_permission, | |
1186 | .setattr = ecryptfs_setattr, | |
1187 | .setxattr = ecryptfs_setxattr, | |
1188 | .getxattr = ecryptfs_getxattr, | |
1189 | .listxattr = ecryptfs_listxattr, | |
1190 | .removexattr = ecryptfs_removexattr | |
1191 | }; | |
1192 | ||
754661f1 | 1193 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1194 | .permission = ecryptfs_permission, |
1195 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1196 | .getattr = ecryptfs_getattr, |
237fead6 MH |
1197 | .setxattr = ecryptfs_setxattr, |
1198 | .getxattr = ecryptfs_getxattr, | |
1199 | .listxattr = ecryptfs_listxattr, | |
1200 | .removexattr = ecryptfs_removexattr | |
1201 | }; |