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