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; |
985ca0e6 | 72 | inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi; |
5ccf9203 TH |
73 | |
74 | if (S_ISLNK(inode->i_mode)) | |
75 | inode->i_op = &ecryptfs_symlink_iops; | |
76 | else if (S_ISDIR(inode->i_mode)) | |
77 | inode->i_op = &ecryptfs_dir_iops; | |
78 | else | |
79 | inode->i_op = &ecryptfs_main_iops; | |
80 | ||
81 | if (S_ISDIR(inode->i_mode)) | |
82 | inode->i_fop = &ecryptfs_dir_fops; | |
83 | else if (special_file(inode->i_mode)) | |
84 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
85 | else | |
86 | inode->i_fop = &ecryptfs_main_fops; | |
87 | ||
c4f79073 TH |
88 | return 0; |
89 | } | |
90 | ||
5ccf9203 TH |
91 | static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, |
92 | struct super_block *sb) | |
c4f79073 TH |
93 | { |
94 | struct inode *inode; | |
c4f79073 | 95 | |
5ccf9203 TH |
96 | if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) |
97 | return ERR_PTR(-EXDEV); | |
98 | if (!igrab(lower_inode)) | |
99 | return ERR_PTR(-ESTALE); | |
c4f79073 TH |
100 | inode = iget5_locked(sb, (unsigned long)lower_inode, |
101 | ecryptfs_inode_test, ecryptfs_inode_set, | |
102 | lower_inode); | |
103 | if (!inode) { | |
c4f79073 | 104 | iput(lower_inode); |
5ccf9203 | 105 | return ERR_PTR(-EACCES); |
c4f79073 | 106 | } |
5ccf9203 | 107 | if (!(inode->i_state & I_NEW)) |
c4f79073 | 108 | iput(lower_inode); |
5ccf9203 TH |
109 | |
110 | return inode; | |
111 | } | |
112 | ||
113 | struct inode *ecryptfs_get_inode(struct inode *lower_inode, | |
114 | struct super_block *sb) | |
115 | { | |
116 | struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); | |
117 | ||
118 | if (!IS_ERR(inode) && (inode->i_state & I_NEW)) | |
119 | unlock_new_inode(inode); | |
120 | ||
c4f79073 | 121 | return inode; |
c4f79073 TH |
122 | } |
123 | ||
c4f79073 TH |
124 | /** |
125 | * ecryptfs_interpose | |
126 | * @lower_dentry: Existing dentry in the lower filesystem | |
127 | * @dentry: ecryptfs' dentry | |
128 | * @sb: ecryptfs's super_block | |
c4f79073 TH |
129 | * |
130 | * Interposes upper and lower dentries. | |
131 | * | |
132 | * Returns zero on success; non-zero otherwise | |
133 | */ | |
134 | static int ecryptfs_interpose(struct dentry *lower_dentry, | |
5ccf9203 | 135 | struct dentry *dentry, struct super_block *sb) |
c4f79073 | 136 | { |
5ccf9203 TH |
137 | struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb); |
138 | ||
c4f79073 TH |
139 | if (IS_ERR(inode)) |
140 | return PTR_ERR(inode); | |
5ccf9203 TH |
141 | d_instantiate(dentry, inode); |
142 | ||
c4f79073 TH |
143 | return 0; |
144 | } | |
145 | ||
237fead6 MH |
146 | /** |
147 | * ecryptfs_create_underlying_file | |
148 | * @lower_dir_inode: inode of the parent in the lower fs of the new file | |
f70f582f | 149 | * @dentry: New file's dentry |
237fead6 | 150 | * @mode: The mode of the new file |
237fead6 MH |
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, | |
bf6c7f6c | 158 | struct dentry *dentry, int mode) |
237fead6 MH |
159 | { |
160 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
bf6c7f6c | 161 | return vfs_create(lower_dir_inode, lower_dentry, mode, NULL); |
237fead6 MH |
162 | } |
163 | ||
164 | /** | |
165 | * ecryptfs_do_create | |
166 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
167 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
168 | * @mode: The mode of the new file | |
169 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
170 | * | |
171 | * Creates the underlying file and the eCryptfs inode which will link to | |
172 | * it. It will also update the eCryptfs directory inode to mimic the | |
173 | * stat of the lower directory inode. | |
174 | * | |
b59db43a | 175 | * Returns the new eCryptfs inode on success; an ERR_PTR on error condition |
237fead6 | 176 | */ |
b59db43a | 177 | static struct inode * |
237fead6 | 178 | ecryptfs_do_create(struct inode *directory_inode, |
bf6c7f6c | 179 | struct dentry *ecryptfs_dentry, int mode) |
237fead6 MH |
180 | { |
181 | int rc; | |
182 | struct dentry *lower_dentry; | |
183 | struct dentry *lower_dir_dentry; | |
b59db43a | 184 | struct inode *inode; |
237fead6 MH |
185 | |
186 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
187 | lower_dir_dentry = lock_parent(lower_dentry); | |
801678c5 | 188 | if (IS_ERR(lower_dir_dentry)) { |
237fead6 MH |
189 | ecryptfs_printk(KERN_ERR, "Error locking directory of " |
190 | "dentry\n"); | |
b59db43a | 191 | inode = ERR_CAST(lower_dir_dentry); |
237fead6 MH |
192 | goto out; |
193 | } | |
194 | rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, | |
bf6c7f6c | 195 | ecryptfs_dentry, mode); |
4981e081 | 196 | if (rc) { |
caeeeecf | 197 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 198 | "rc = [%d]\n", __func__, rc); |
b59db43a | 199 | inode = ERR_PTR(rc); |
caeeeecf | 200 | goto out_lock; |
237fead6 | 201 | } |
b59db43a TH |
202 | inode = __ecryptfs_get_inode(lower_dentry->d_inode, |
203 | directory_inode->i_sb); | |
204 | if (IS_ERR(inode)) | |
237fead6 | 205 | goto out_lock; |
0cc72dc7 JJS |
206 | fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); |
207 | fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); | |
237fead6 MH |
208 | out_lock: |
209 | unlock_dir(lower_dir_dentry); | |
210 | out: | |
b59db43a | 211 | return inode; |
237fead6 MH |
212 | } |
213 | ||
237fead6 MH |
214 | /** |
215 | * ecryptfs_initialize_file | |
216 | * | |
217 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
218 | * file with a header and first data page. | |
219 | * | |
220 | * Returns zero on success | |
221 | */ | |
b59db43a TH |
222 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, |
223 | struct inode *ecryptfs_inode) | |
237fead6 | 224 | { |
d7cdc5fe | 225 | struct ecryptfs_crypt_stat *crypt_stat = |
b59db43a | 226 | &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; |
237fead6 | 227 | int rc = 0; |
237fead6 | 228 | |
b59db43a | 229 | if (S_ISDIR(ecryptfs_inode->i_mode)) { |
237fead6 | 230 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); |
e2bd99ec | 231 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 232 | goto out; |
237fead6 | 233 | } |
237fead6 | 234 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
b59db43a | 235 | rc = ecryptfs_new_file_context(ecryptfs_inode); |
237fead6 | 236 | if (rc) { |
d7cdc5fe MH |
237 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
238 | "context; rc = [%d]\n", rc); | |
239 | goto out; | |
237fead6 | 240 | } |
b59db43a | 241 | rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); |
27992890 RS |
242 | if (rc) { |
243 | printk(KERN_ERR "%s: Error attempting to initialize " | |
332ab16f | 244 | "the lower file for the dentry with name " |
27992890 RS |
245 | "[%s]; rc = [%d]\n", __func__, |
246 | ecryptfs_dentry->d_name.name, rc); | |
247 | goto out; | |
391b52f9 | 248 | } |
b59db43a | 249 | rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); |
332ab16f | 250 | if (rc) |
d7cdc5fe | 251 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
b59db43a | 252 | ecryptfs_put_lower_file(ecryptfs_inode); |
237fead6 MH |
253 | out: |
254 | return rc; | |
255 | } | |
256 | ||
257 | /** | |
258 | * ecryptfs_create | |
259 | * @dir: The inode of the directory in which to create the file. | |
260 | * @dentry: The eCryptfs dentry | |
261 | * @mode: The mode of the new file. | |
262 | * @nd: nameidata | |
263 | * | |
264 | * Creates a new file. | |
265 | * | |
266 | * Returns zero on success; non-zero on error condition | |
267 | */ | |
268 | static int | |
269 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
270 | int mode, struct nameidata *nd) | |
271 | { | |
b59db43a | 272 | struct inode *ecryptfs_inode; |
237fead6 MH |
273 | int rc; |
274 | ||
b59db43a TH |
275 | ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, |
276 | mode); | |
277 | if (unlikely(IS_ERR(ecryptfs_inode))) { | |
237fead6 MH |
278 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
279 | "lower filesystem\n"); | |
b59db43a | 280 | rc = PTR_ERR(ecryptfs_inode); |
237fead6 MH |
281 | goto out; |
282 | } | |
283 | /* At this point, a file exists on "disk"; we need to make sure | |
284 | * that this on disk file is prepared to be an ecryptfs file */ | |
b59db43a TH |
285 | rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); |
286 | if (rc) { | |
287 | drop_nlink(ecryptfs_inode); | |
288 | unlock_new_inode(ecryptfs_inode); | |
289 | iput(ecryptfs_inode); | |
290 | goto out; | |
291 | } | |
292 | d_instantiate(ecryptfs_dentry, ecryptfs_inode); | |
293 | unlock_new_inode(ecryptfs_inode); | |
237fead6 MH |
294 | out: |
295 | return rc; | |
296 | } | |
297 | ||
778aeb42 TH |
298 | static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) |
299 | { | |
300 | struct ecryptfs_crypt_stat *crypt_stat; | |
301 | int rc; | |
302 | ||
303 | rc = ecryptfs_get_lower_file(dentry, inode); | |
304 | if (rc) { | |
305 | printk(KERN_ERR "%s: Error attempting to initialize " | |
306 | "the lower file for the dentry with name " | |
307 | "[%s]; rc = [%d]\n", __func__, | |
308 | dentry->d_name.name, rc); | |
309 | return rc; | |
310 | } | |
311 | ||
312 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
313 | /* TODO: lock for crypt_stat comparison */ | |
314 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
315 | ecryptfs_set_default_sizes(crypt_stat); | |
316 | ||
317 | rc = ecryptfs_read_and_validate_header_region(inode); | |
318 | ecryptfs_put_lower_file(inode); | |
319 | if (rc) { | |
320 | rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); | |
321 | if (!rc) | |
322 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; | |
323 | } | |
324 | ||
325 | /* Must return 0 to allow non-eCryptfs files to be looked up, too */ | |
326 | return 0; | |
327 | } | |
328 | ||
237fead6 | 329 | /** |
5ccf9203 | 330 | * ecryptfs_lookup_interpose - Dentry interposition for a lookup |
237fead6 | 331 | */ |
778aeb42 | 332 | static int ecryptfs_lookup_interpose(struct dentry *dentry, |
5ccf9203 | 333 | struct dentry *lower_dentry, |
778aeb42 | 334 | struct inode *dir_inode) |
237fead6 | 335 | { |
778aeb42 TH |
336 | struct inode *inode, *lower_inode = lower_dentry->d_inode; |
337 | struct ecryptfs_dentry_info *dentry_info; | |
237fead6 | 338 | struct vfsmount *lower_mnt; |
778aeb42 TH |
339 | int rc = 0; |
340 | ||
341 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); | |
342 | fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode); | |
b7ab39f6 | 343 | BUG_ON(!lower_dentry->d_count); |
778aeb42 TH |
344 | |
345 | dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); | |
346 | ecryptfs_set_dentry_private(dentry, dentry_info); | |
347 | if (!dentry_info) { | |
addd65ad MH |
348 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
349 | "to allocate ecryptfs_dentry_info struct\n", | |
350 | __func__); | |
778aeb42 TH |
351 | dput(lower_dentry); |
352 | mntput(lower_mnt); | |
353 | d_drop(dentry); | |
354 | return -ENOMEM; | |
237fead6 | 355 | } |
778aeb42 TH |
356 | ecryptfs_set_dentry_lower(dentry, lower_dentry); |
357 | ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); | |
358 | ||
237fead6 MH |
359 | if (!lower_dentry->d_inode) { |
360 | /* We want to add because we couldn't find in lower */ | |
778aeb42 TH |
361 | d_add(dentry, NULL); |
362 | return 0; | |
237fead6 | 363 | } |
778aeb42 | 364 | inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); |
5ccf9203 | 365 | if (IS_ERR(inode)) { |
778aeb42 TH |
366 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", |
367 | __func__, PTR_ERR(inode)); | |
368 | return PTR_ERR(inode); | |
391b52f9 | 369 | } |
778aeb42 TH |
370 | if (S_ISREG(inode->i_mode)) { |
371 | rc = ecryptfs_i_size_read(dentry, inode); | |
dd2a3b7a | 372 | if (rc) { |
778aeb42 TH |
373 | make_bad_inode(inode); |
374 | return rc; | |
237fead6 | 375 | } |
237fead6 | 376 | } |
778aeb42 | 377 | |
3b06b3eb TH |
378 | if (inode->i_state & I_NEW) |
379 | unlock_new_inode(inode); | |
778aeb42 TH |
380 | d_add(dentry, inode); |
381 | ||
addd65ad MH |
382 | return rc; |
383 | } | |
384 | ||
385 | /** | |
386 | * ecryptfs_lookup | |
387 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
388 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
389 | * @ecryptfs_nd: nameidata; may be NULL | |
390 | * | |
391 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
392 | * dentry cache and continue on to read it from the disk. | |
393 | */ | |
394 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
395 | struct dentry *ecryptfs_dentry, | |
396 | struct nameidata *ecryptfs_nd) | |
397 | { | |
398 | char *encrypted_and_encoded_name = NULL; | |
a8f12864 | 399 | size_t encrypted_and_encoded_name_size; |
addd65ad | 400 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
addd65ad MH |
401 | struct dentry *lower_dir_dentry, *lower_dentry; |
402 | int rc = 0; | |
403 | ||
addd65ad MH |
404 | if ((ecryptfs_dentry->d_name.len == 1 |
405 | && !strcmp(ecryptfs_dentry->d_name.name, ".")) | |
406 | || (ecryptfs_dentry->d_name.len == 2 | |
407 | && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { | |
408 | goto out_d_drop; | |
409 | } | |
410 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); | |
8787c7a3 TH |
411 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
412 | lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, | |
413 | lower_dir_dentry, | |
414 | ecryptfs_dentry->d_name.len); | |
415 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
416 | if (IS_ERR(lower_dentry)) { |
417 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 418 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
419 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
420 | encrypted_and_encoded_name); | |
addd65ad MH |
421 | goto out_d_drop; |
422 | } | |
423 | if (lower_dentry->d_inode) | |
5ccf9203 | 424 | goto interpose; |
2aac0cf8 TH |
425 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
426 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
427 | if (!(mount_crypt_stat | |
428 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) | |
5ccf9203 | 429 | goto interpose; |
addd65ad MH |
430 | dput(lower_dentry); |
431 | rc = ecryptfs_encrypt_and_encode_filename( | |
432 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, | |
2aac0cf8 | 433 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
addd65ad MH |
434 | ecryptfs_dentry->d_name.len); |
435 | if (rc) { | |
436 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
437 | "filename; rc = [%d]\n", __func__, rc); | |
438 | goto out_d_drop; | |
439 | } | |
8787c7a3 TH |
440 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
441 | lower_dentry = lookup_one_len(encrypted_and_encoded_name, | |
442 | lower_dir_dentry, | |
443 | encrypted_and_encoded_name_size); | |
444 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
445 | if (IS_ERR(lower_dentry)) { |
446 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 447 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
448 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
449 | encrypted_and_encoded_name); | |
addd65ad MH |
450 | goto out_d_drop; |
451 | } | |
5ccf9203 TH |
452 | interpose: |
453 | rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, | |
454 | ecryptfs_dir_inode); | |
addd65ad MH |
455 | goto out; |
456 | out_d_drop: | |
457 | d_drop(ecryptfs_dentry); | |
237fead6 | 458 | out: |
addd65ad | 459 | kfree(encrypted_and_encoded_name); |
237fead6 MH |
460 | return ERR_PTR(rc); |
461 | } | |
462 | ||
463 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
464 | struct dentry *new_dentry) | |
465 | { | |
466 | struct dentry *lower_old_dentry; | |
467 | struct dentry *lower_new_dentry; | |
468 | struct dentry *lower_dir_dentry; | |
469 | u64 file_size_save; | |
470 | int rc; | |
471 | ||
472 | file_size_save = i_size_read(old_dentry->d_inode); | |
473 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
474 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
475 | dget(lower_old_dentry); | |
476 | dget(lower_new_dentry); | |
477 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
478 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
479 | lower_new_dentry); | |
480 | if (rc || !lower_new_dentry->d_inode) | |
481 | goto out_lock; | |
5ccf9203 | 482 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
237fead6 MH |
483 | if (rc) |
484 | goto out_lock; | |
3a8380c0 TH |
485 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
486 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
bfe86848 MS |
487 | set_nlink(old_dentry->d_inode, |
488 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink); | |
237fead6 MH |
489 | i_size_write(new_dentry->d_inode, file_size_save); |
490 | out_lock: | |
491 | unlock_dir(lower_dir_dentry); | |
492 | dput(lower_new_dentry); | |
493 | dput(lower_old_dentry); | |
237fead6 MH |
494 | return rc; |
495 | } | |
496 | ||
497 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
498 | { | |
499 | int rc = 0; | |
500 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
501 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
8dc4e373 | 502 | struct dentry *lower_dir_dentry; |
237fead6 | 503 | |
9c2d2056 | 504 | dget(lower_dentry); |
8dc4e373 | 505 | lower_dir_dentry = lock_parent(lower_dentry); |
237fead6 MH |
506 | rc = vfs_unlink(lower_dir_inode, lower_dentry); |
507 | if (rc) { | |
ae56fb16 | 508 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
509 | goto out_unlock; |
510 | } | |
0cc72dc7 | 511 | fsstack_copy_attr_times(dir, lower_dir_inode); |
bfe86848 MS |
512 | set_nlink(dentry->d_inode, |
513 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink); | |
237fead6 | 514 | dentry->d_inode->i_ctime = dir->i_ctime; |
caeeeecf | 515 | d_drop(dentry); |
237fead6 | 516 | out_unlock: |
8dc4e373 | 517 | unlock_dir(lower_dir_dentry); |
9c2d2056 | 518 | dput(lower_dentry); |
237fead6 MH |
519 | return rc; |
520 | } | |
521 | ||
522 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
523 | const char *symname) | |
524 | { | |
525 | int rc; | |
526 | struct dentry *lower_dentry; | |
527 | struct dentry *lower_dir_dentry; | |
237fead6 | 528 | char *encoded_symname; |
addd65ad MH |
529 | size_t encoded_symlen; |
530 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
531 | |
532 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
533 | dget(lower_dentry); | |
534 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
535 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
536 | dir->i_sb)->mount_crypt_stat; | |
537 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
538 | &encoded_symlen, | |
539 | NULL, | |
540 | mount_crypt_stat, symname, | |
541 | strlen(symname)); | |
542 | if (rc) | |
237fead6 | 543 | goto out_lock; |
237fead6 | 544 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, |
db2e747b | 545 | encoded_symname); |
237fead6 MH |
546 | kfree(encoded_symname); |
547 | if (rc || !lower_dentry->d_inode) | |
548 | goto out_lock; | |
5ccf9203 | 549 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
550 | if (rc) |
551 | goto out_lock; | |
0cc72dc7 JJS |
552 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
553 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
554 | out_lock: |
555 | unlock_dir(lower_dir_dentry); | |
556 | dput(lower_dentry); | |
557 | if (!dentry->d_inode) | |
558 | d_drop(dentry); | |
559 | return rc; | |
560 | } | |
561 | ||
562 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
563 | { | |
564 | int rc; | |
565 | struct dentry *lower_dentry; | |
566 | struct dentry *lower_dir_dentry; | |
567 | ||
568 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
569 | lower_dir_dentry = lock_parent(lower_dentry); | |
570 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
571 | if (rc || !lower_dentry->d_inode) | |
572 | goto out; | |
5ccf9203 | 573 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
574 | if (rc) |
575 | goto out; | |
0cc72dc7 JJS |
576 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
577 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
bfe86848 | 578 | set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); |
237fead6 MH |
579 | out: |
580 | unlock_dir(lower_dir_dentry); | |
581 | if (!dentry->d_inode) | |
582 | d_drop(dentry); | |
583 | return rc; | |
584 | } | |
585 | ||
586 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
587 | { | |
237fead6 | 588 | struct dentry *lower_dentry; |
237fead6 | 589 | struct dentry *lower_dir_dentry; |
45ec4aba | 590 | int rc; |
237fead6 MH |
591 | |
592 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 593 | dget(dentry); |
237fead6 | 594 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 595 | dget(lower_dentry); |
237fead6 | 596 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba | 597 | dput(lower_dentry); |
07850552 TH |
598 | if (!rc && dentry->d_inode) |
599 | clear_nlink(dentry->d_inode); | |
0cc72dc7 | 600 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
bfe86848 | 601 | set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); |
237fead6 MH |
602 | unlock_dir(lower_dir_dentry); |
603 | if (!rc) | |
604 | d_drop(dentry); | |
45ec4aba | 605 | dput(dentry); |
237fead6 MH |
606 | return rc; |
607 | } | |
608 | ||
609 | static int | |
610 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
611 | { | |
612 | int rc; | |
613 | struct dentry *lower_dentry; | |
614 | struct dentry *lower_dir_dentry; | |
615 | ||
616 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
617 | lower_dir_dentry = lock_parent(lower_dentry); | |
618 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
619 | if (rc || !lower_dentry->d_inode) | |
620 | goto out; | |
5ccf9203 | 621 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
622 | if (rc) |
623 | goto out; | |
0cc72dc7 JJS |
624 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
625 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
626 | out: |
627 | unlock_dir(lower_dir_dentry); | |
628 | if (!dentry->d_inode) | |
629 | d_drop(dentry); | |
630 | return rc; | |
631 | } | |
632 | ||
633 | static int | |
634 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
635 | struct inode *new_dir, struct dentry *new_dentry) | |
636 | { | |
637 | int rc; | |
638 | struct dentry *lower_old_dentry; | |
639 | struct dentry *lower_new_dentry; | |
640 | struct dentry *lower_old_dir_dentry; | |
641 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 642 | struct dentry *trap = NULL; |
237fead6 MH |
643 | |
644 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
645 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
646 | dget(lower_old_dentry); | |
647 | dget(lower_new_dentry); | |
648 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
649 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
0d132f73 EZ |
650 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
651 | /* source should not be ancestor of target */ | |
652 | if (trap == lower_old_dentry) { | |
653 | rc = -EINVAL; | |
654 | goto out_lock; | |
655 | } | |
656 | /* target should not be ancestor of source */ | |
657 | if (trap == lower_new_dentry) { | |
658 | rc = -ENOTEMPTY; | |
659 | goto out_lock; | |
660 | } | |
237fead6 MH |
661 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, |
662 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
663 | if (rc) | |
664 | goto out_lock; | |
9afa2fb6 | 665 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); |
237fead6 | 666 | if (new_dir != old_dir) |
9afa2fb6 | 667 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); |
237fead6 MH |
668 | out_lock: |
669 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
dd55c898 TH |
670 | dput(lower_new_dir_dentry); |
671 | dput(lower_old_dir_dentry); | |
237fead6 MH |
672 | dput(lower_new_dentry); |
673 | dput(lower_old_dentry); | |
674 | return rc; | |
675 | } | |
676 | ||
3a60a168 TH |
677 | static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, |
678 | size_t *bufsiz) | |
237fead6 | 679 | { |
3a60a168 | 680 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
237fead6 | 681 | char *lower_buf; |
3a60a168 | 682 | size_t lower_bufsiz = PATH_MAX; |
addd65ad MH |
683 | mm_segment_t old_fs; |
684 | int rc; | |
237fead6 | 685 | |
3a6b42ca | 686 | lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); |
3a60a168 | 687 | if (!lower_buf) { |
237fead6 MH |
688 | rc = -ENOMEM; |
689 | goto out; | |
690 | } | |
691 | old_fs = get_fs(); | |
692 | set_fs(get_ds()); | |
237fead6 MH |
693 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, |
694 | (char __user *)lower_buf, | |
3a6b42ca | 695 | lower_bufsiz); |
237fead6 | 696 | set_fs(old_fs); |
3a60a168 TH |
697 | if (rc < 0) |
698 | goto out; | |
699 | lower_bufsiz = rc; | |
700 | rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, | |
701 | lower_buf, lower_bufsiz); | |
702 | out: | |
237fead6 | 703 | kfree(lower_buf); |
3a60a168 TH |
704 | return rc; |
705 | } | |
706 | ||
707 | static int | |
708 | ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) | |
709 | { | |
710 | char *kbuf; | |
711 | size_t kbufsiz, copied; | |
712 | int rc; | |
713 | ||
714 | rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); | |
715 | if (rc) | |
716 | goto out; | |
717 | copied = min_t(size_t, bufsiz, kbufsiz); | |
718 | rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; | |
719 | kfree(kbuf); | |
720 | fsstack_copy_attr_atime(dentry->d_inode, | |
721 | ecryptfs_dentry_to_lower(dentry)->d_inode); | |
237fead6 MH |
722 | out: |
723 | return rc; | |
724 | } | |
725 | ||
726 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
727 | { | |
728 | char *buf; | |
729 | int len = PAGE_SIZE, rc; | |
730 | mm_segment_t old_fs; | |
731 | ||
732 | /* Released in ecryptfs_put_link(); only release here on error */ | |
733 | buf = kmalloc(len, GFP_KERNEL); | |
734 | if (!buf) { | |
806892e9 | 735 | buf = ERR_PTR(-ENOMEM); |
237fead6 MH |
736 | goto out; |
737 | } | |
738 | old_fs = get_fs(); | |
739 | set_fs(get_ds()); | |
237fead6 | 740 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); |
237fead6 | 741 | set_fs(old_fs); |
806892e9 OH |
742 | if (rc < 0) { |
743 | kfree(buf); | |
744 | buf = ERR_PTR(rc); | |
745 | } else | |
a17d5232 | 746 | buf[rc] = '\0'; |
237fead6 | 747 | out: |
806892e9 OH |
748 | nd_set_link(nd, buf); |
749 | return NULL; | |
237fead6 MH |
750 | } |
751 | ||
752 | static void | |
753 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
754 | { | |
806892e9 OH |
755 | char *buf = nd_get_link(nd); |
756 | if (!IS_ERR(buf)) { | |
757 | /* Free the char* */ | |
758 | kfree(buf); | |
759 | } | |
237fead6 MH |
760 | } |
761 | ||
762 | /** | |
763 | * upper_size_to_lower_size | |
764 | * @crypt_stat: Crypt_stat associated with file | |
765 | * @upper_size: Size of the upper file | |
766 | * | |
cc11beff | 767 | * Calculate the required size of the lower file based on the |
237fead6 MH |
768 | * specified size of the upper file. This calculation is based on the |
769 | * number of headers in the underlying file and the extent size. | |
770 | * | |
771 | * Returns Calculated size of the lower file. | |
772 | */ | |
773 | static loff_t | |
774 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
775 | loff_t upper_size) | |
776 | { | |
777 | loff_t lower_size; | |
778 | ||
157f1071 | 779 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
780 | if (upper_size != 0) { |
781 | loff_t num_extents; | |
782 | ||
783 | num_extents = upper_size >> crypt_stat->extent_shift; | |
784 | if (upper_size & ~crypt_stat->extent_mask) | |
785 | num_extents++; | |
786 | lower_size += (num_extents * crypt_stat->extent_size); | |
787 | } | |
788 | return lower_size; | |
789 | } | |
790 | ||
791 | /** | |
5f3ef64f | 792 | * truncate_upper |
237fead6 | 793 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
794 | * @ia: Address of the ecryptfs inode's attributes |
795 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
796 | * |
797 | * Function to handle truncations modifying the size of the file. Note | |
798 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
799 | * writing strings of 0's out. When truncating, we truncate the upper |
800 | * inode and update the lower_ia according to the page index | |
801 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
802 | * the caller must use lower_ia in a call to notify_change() to perform | |
803 | * the truncation of the lower inode. | |
237fead6 MH |
804 | * |
805 | * Returns zero on success; non-zero otherwise | |
806 | */ | |
5f3ef64f TH |
807 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
808 | struct iattr *lower_ia) | |
237fead6 MH |
809 | { |
810 | int rc = 0; | |
811 | struct inode *inode = dentry->d_inode; | |
237fead6 MH |
812 | struct ecryptfs_crypt_stat *crypt_stat; |
813 | loff_t i_size = i_size_read(inode); | |
814 | loff_t lower_size_before_truncate; | |
815 | loff_t lower_size_after_truncate; | |
816 | ||
5f3ef64f TH |
817 | if (unlikely((ia->ia_size == i_size))) { |
818 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 819 | return 0; |
5f3ef64f | 820 | } |
3b06b3eb | 821 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
822 | if (rc) |
823 | return rc; | |
237fead6 | 824 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
237fead6 | 825 | /* Switch on growing or shrinking file */ |
5f3ef64f | 826 | if (ia->ia_size > i_size) { |
2ed92554 MH |
827 | char zero[] = { 0x00 }; |
828 | ||
5f3ef64f | 829 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
830 | /* Write a single 0 at the last position of the file; |
831 | * this triggers code that will fill in 0's throughout | |
832 | * the intermediate portion of the previous end of the | |
833 | * file and the new and of the file */ | |
48c1e44a | 834 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
835 | (ia->ia_size - 1), 1); |
836 | } else { /* ia->ia_size < i_size_read(inode) */ | |
837 | /* We're chopping off all the pages down to the page | |
838 | * in which ia->ia_size is located. Fill in the end of | |
839 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to | |
2ed92554 MH |
840 | * PAGE_CACHE_SIZE with zeros. */ |
841 | size_t num_zeros = (PAGE_CACHE_SIZE | |
5f3ef64f | 842 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
2ed92554 | 843 | |
2c27c65e CH |
844 | |
845 | /* | |
846 | * XXX(truncate) this should really happen at the begginning | |
847 | * of ->setattr. But the code is too messy to that as part | |
848 | * of a larger patch. ecryptfs is also totally missing out | |
849 | * on the inode_change_ok check at the beginning of | |
850 | * ->setattr while would include this. | |
851 | */ | |
852 | rc = inode_newsize_ok(inode, ia->ia_size); | |
853 | if (rc) | |
854 | goto out; | |
855 | ||
13a791b4 | 856 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 857 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
858 | lower_ia->ia_size = ia->ia_size; |
859 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 860 | goto out; |
13a791b4 | 861 | } |
2ed92554 MH |
862 | if (num_zeros) { |
863 | char *zeros_virt; | |
864 | ||
865 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
866 | if (!zeros_virt) { | |
867 | rc = -ENOMEM; | |
48c1e44a | 868 | goto out; |
2ed92554 | 869 | } |
48c1e44a | 870 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 871 | ia->ia_size, num_zeros); |
2ed92554 | 872 | kfree(zeros_virt); |
5dda6992 | 873 | if (rc) { |
240e2df5 MH |
874 | printk(KERN_ERR "Error attempting to zero out " |
875 | "the remainder of the end page on " | |
876 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 877 | goto out; |
240e2df5 MH |
878 | } |
879 | } | |
2c27c65e | 880 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 881 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
882 | if (rc) { |
883 | printk(KERN_ERR "Problem with " | |
884 | "ecryptfs_write_inode_size_to_metadata; " | |
885 | "rc = [%d]\n", rc); | |
48c1e44a | 886 | goto out; |
dd2a3b7a | 887 | } |
237fead6 MH |
888 | /* We are reducing the size of the ecryptfs file, and need to |
889 | * know if we need to reduce the size of the lower file. */ | |
890 | lower_size_before_truncate = | |
891 | upper_size_to_lower_size(crypt_stat, i_size); | |
892 | lower_size_after_truncate = | |
5f3ef64f TH |
893 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
894 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
895 | lower_ia->ia_size = lower_size_after_truncate; | |
896 | lower_ia->ia_valid |= ATTR_SIZE; | |
897 | } else | |
898 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 899 | } |
237fead6 | 900 | out: |
332ab16f | 901 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
902 | return rc; |
903 | } | |
904 | ||
5f3ef64f TH |
905 | /** |
906 | * ecryptfs_truncate | |
907 | * @dentry: The ecryptfs layer dentry | |
908 | * @new_length: The length to expand the file to | |
909 | * | |
910 | * Simple function that handles the truncation of an eCryptfs inode and | |
911 | * its corresponding lower inode. | |
912 | * | |
913 | * Returns zero on success; non-zero otherwise | |
914 | */ | |
915 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
916 | { | |
917 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
918 | struct iattr lower_ia = { .ia_valid = 0 }; | |
919 | int rc; | |
920 | ||
921 | rc = truncate_upper(dentry, &ia, &lower_ia); | |
922 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
923 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
924 | ||
925 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
926 | rc = notify_change(lower_dentry, &lower_ia); | |
927 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
928 | } | |
929 | return rc; | |
930 | } | |
931 | ||
237fead6 | 932 | static int |
10556cb2 | 933 | ecryptfs_permission(struct inode *inode, int mask) |
237fead6 | 934 | { |
f419a2e3 | 935 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
936 | } |
937 | ||
938 | /** | |
939 | * ecryptfs_setattr | |
940 | * @dentry: dentry handle to the inode to modify | |
941 | * @ia: Structure with flags of what to change and values | |
942 | * | |
943 | * Updates the metadata of an inode. If the update is to the size | |
944 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
945 | * of both the ecryptfs inode and the lower inode. | |
946 | * | |
947 | * All other metadata changes will be passed right to the lower filesystem, | |
948 | * and we will just update our inode to look like the lower. | |
949 | */ | |
950 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
951 | { | |
952 | int rc = 0; | |
953 | struct dentry *lower_dentry; | |
5f3ef64f | 954 | struct iattr lower_ia; |
237fead6 MH |
955 | struct inode *inode; |
956 | struct inode *lower_inode; | |
957 | struct ecryptfs_crypt_stat *crypt_stat; | |
958 | ||
959 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
960 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
961 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
962 | inode = dentry->d_inode; |
963 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
964 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
965 | mutex_lock(&crypt_stat->cs_mutex); | |
966 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
967 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
968 | else if (S_ISREG(dentry->d_inode->i_mode) |
969 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
970 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 971 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 972 | |
e10f281b MH |
973 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
974 | dentry->d_sb)->mount_crypt_stat; | |
3b06b3eb | 975 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
976 | if (rc) { |
977 | mutex_unlock(&crypt_stat->cs_mutex); | |
978 | goto out; | |
979 | } | |
d7cdc5fe | 980 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 981 | ecryptfs_put_lower_file(inode); |
5dda6992 | 982 | if (rc) { |
e10f281b MH |
983 | if (!(mount_crypt_stat->flags |
984 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
985 | rc = -EIO; | |
25bd8174 | 986 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 987 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
988 | "or the key could not be retrieved. " |
989 | "Plaintext passthrough mode is not " | |
e10f281b | 990 | "enabled; returning -EIO\n"); |
e10f281b | 991 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
992 | goto out; |
993 | } | |
994 | rc = 0; | |
3aeb86ea TH |
995 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
996 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 997 | } |
e10f281b MH |
998 | } |
999 | mutex_unlock(&crypt_stat->cs_mutex); | |
5be79de2 TH |
1000 | if (S_ISREG(inode->i_mode)) { |
1001 | rc = filemap_write_and_wait(inode->i_mapping); | |
1002 | if (rc) | |
1003 | goto out; | |
1004 | fsstack_copy_attr_all(inode, lower_inode); | |
1005 | } | |
5f3ef64f TH |
1006 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
1007 | if (ia->ia_valid & ATTR_FILE) | |
1008 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 1009 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 1010 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
1011 | if (rc < 0) |
1012 | goto out; | |
1013 | } | |
1ac564ec JL |
1014 | |
1015 | /* | |
1016 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
1017 | * to interpret this in its own way. | |
1018 | */ | |
5f3ef64f TH |
1019 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
1020 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 1021 | |
9c3580aa | 1022 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
5f3ef64f | 1023 | rc = notify_change(lower_dentry, &lower_ia); |
9c3580aa | 1024 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
237fead6 | 1025 | out: |
9afa2fb6 | 1026 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
1027 | return rc; |
1028 | } | |
1029 | ||
3a60a168 TH |
1030 | int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
1031 | struct kstat *stat) | |
1032 | { | |
1033 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; | |
1034 | int rc = 0; | |
1035 | ||
1036 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
1037 | dentry->d_sb)->mount_crypt_stat; | |
1038 | generic_fillattr(dentry->d_inode, stat); | |
1039 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { | |
1040 | char *target; | |
1041 | size_t targetsiz; | |
1042 | ||
1043 | rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); | |
1044 | if (!rc) { | |
1045 | kfree(target); | |
1046 | stat->size = targetsiz; | |
1047 | } | |
1048 | } | |
1049 | return rc; | |
1050 | } | |
1051 | ||
f8f484d1 TH |
1052 | int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1053 | struct kstat *stat) | |
1054 | { | |
1055 | struct kstat lower_stat; | |
1056 | int rc; | |
1057 | ||
1058 | rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), | |
1059 | ecryptfs_dentry_to_lower(dentry), &lower_stat); | |
1060 | if (!rc) { | |
55f9cf6b TH |
1061 | fsstack_copy_attr_all(dentry->d_inode, |
1062 | ecryptfs_inode_to_lower(dentry->d_inode)); | |
f8f484d1 TH |
1063 | generic_fillattr(dentry->d_inode, stat); |
1064 | stat->blocks = lower_stat.blocks; | |
1065 | } | |
1066 | return rc; | |
1067 | } | |
1068 | ||
dd2a3b7a | 1069 | int |
237fead6 MH |
1070 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
1071 | size_t size, int flags) | |
1072 | { | |
1073 | int rc = 0; | |
1074 | struct dentry *lower_dentry; | |
1075 | ||
1076 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1077 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
cfce08c6 | 1078 | rc = -EOPNOTSUPP; |
237fead6 MH |
1079 | goto out; |
1080 | } | |
48b512e6 RS |
1081 | |
1082 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); | |
237fead6 MH |
1083 | out: |
1084 | return rc; | |
1085 | } | |
1086 | ||
d7cdc5fe MH |
1087 | ssize_t |
1088 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
1089 | void *value, size_t size) | |
1090 | { | |
1091 | int rc = 0; | |
1092 | ||
1093 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
cfce08c6 | 1094 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1095 | goto out; |
1096 | } | |
1097 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1098 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
1099 | size); | |
1100 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1101 | out: | |
1102 | return rc; | |
1103 | } | |
1104 | ||
7896b631 | 1105 | static ssize_t |
237fead6 MH |
1106 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
1107 | size_t size) | |
1108 | { | |
2ed92554 MH |
1109 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
1110 | value, size); | |
237fead6 MH |
1111 | } |
1112 | ||
1113 | static ssize_t | |
1114 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1115 | { | |
1116 | int rc = 0; | |
1117 | struct dentry *lower_dentry; | |
1118 | ||
1119 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1120 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
cfce08c6 | 1121 | rc = -EOPNOTSUPP; |
237fead6 MH |
1122 | goto out; |
1123 | } | |
1124 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1125 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
1126 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1127 | out: | |
1128 | return rc; | |
1129 | } | |
1130 | ||
1131 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
1132 | { | |
1133 | int rc = 0; | |
1134 | struct dentry *lower_dentry; | |
1135 | ||
1136 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1137 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
cfce08c6 | 1138 | rc = -EOPNOTSUPP; |
237fead6 MH |
1139 | goto out; |
1140 | } | |
1141 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1142 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
1143 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1144 | out: | |
1145 | return rc; | |
1146 | } | |
1147 | ||
754661f1 | 1148 | const struct inode_operations ecryptfs_symlink_iops = { |
237fead6 MH |
1149 | .readlink = ecryptfs_readlink, |
1150 | .follow_link = ecryptfs_follow_link, | |
1151 | .put_link = ecryptfs_put_link, | |
1152 | .permission = ecryptfs_permission, | |
1153 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1154 | .getattr = ecryptfs_getattr_link, |
237fead6 MH |
1155 | .setxattr = ecryptfs_setxattr, |
1156 | .getxattr = ecryptfs_getxattr, | |
1157 | .listxattr = ecryptfs_listxattr, | |
1158 | .removexattr = ecryptfs_removexattr | |
1159 | }; | |
1160 | ||
754661f1 | 1161 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1162 | .create = ecryptfs_create, |
1163 | .lookup = ecryptfs_lookup, | |
1164 | .link = ecryptfs_link, | |
1165 | .unlink = ecryptfs_unlink, | |
1166 | .symlink = ecryptfs_symlink, | |
1167 | .mkdir = ecryptfs_mkdir, | |
1168 | .rmdir = ecryptfs_rmdir, | |
1169 | .mknod = ecryptfs_mknod, | |
1170 | .rename = ecryptfs_rename, | |
1171 | .permission = ecryptfs_permission, | |
1172 | .setattr = ecryptfs_setattr, | |
1173 | .setxattr = ecryptfs_setxattr, | |
1174 | .getxattr = ecryptfs_getxattr, | |
1175 | .listxattr = ecryptfs_listxattr, | |
1176 | .removexattr = ecryptfs_removexattr | |
1177 | }; | |
1178 | ||
754661f1 | 1179 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1180 | .permission = ecryptfs_permission, |
1181 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1182 | .getattr = ecryptfs_getattr, |
237fead6 MH |
1183 | .setxattr = ecryptfs_setxattr, |
1184 | .getxattr = ecryptfs_getxattr, | |
1185 | .listxattr = ecryptfs_listxattr, | |
1186 | .removexattr = ecryptfs_removexattr | |
1187 | }; |