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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_do_create | |
148 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
149 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
150 | * @mode: The mode of the new file | |
151 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
152 | * | |
153 | * Creates the underlying file and the eCryptfs inode which will link to | |
154 | * it. It will also update the eCryptfs directory inode to mimic the | |
155 | * stat of the lower directory inode. | |
156 | * | |
b59db43a | 157 | * Returns the new eCryptfs inode on success; an ERR_PTR on error condition |
237fead6 | 158 | */ |
b59db43a | 159 | static struct inode * |
237fead6 | 160 | ecryptfs_do_create(struct inode *directory_inode, |
175a4eb7 | 161 | struct dentry *ecryptfs_dentry, umode_t mode) |
237fead6 MH |
162 | { |
163 | int rc; | |
164 | struct dentry *lower_dentry; | |
165 | struct dentry *lower_dir_dentry; | |
b59db43a | 166 | struct inode *inode; |
237fead6 MH |
167 | |
168 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
169 | lower_dir_dentry = lock_parent(lower_dentry); | |
801678c5 | 170 | if (IS_ERR(lower_dir_dentry)) { |
237fead6 MH |
171 | ecryptfs_printk(KERN_ERR, "Error locking directory of " |
172 | "dentry\n"); | |
b59db43a | 173 | inode = ERR_CAST(lower_dir_dentry); |
237fead6 MH |
174 | goto out; |
175 | } | |
18cb1b08 | 176 | rc = vfs_create(lower_dir_dentry->d_inode, lower_dentry, mode, NULL); |
4981e081 | 177 | if (rc) { |
caeeeecf | 178 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 179 | "rc = [%d]\n", __func__, rc); |
b59db43a | 180 | inode = ERR_PTR(rc); |
caeeeecf | 181 | goto out_lock; |
237fead6 | 182 | } |
b59db43a TH |
183 | inode = __ecryptfs_get_inode(lower_dentry->d_inode, |
184 | directory_inode->i_sb); | |
185 | if (IS_ERR(inode)) | |
237fead6 | 186 | goto out_lock; |
0cc72dc7 JJS |
187 | fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); |
188 | fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); | |
237fead6 MH |
189 | out_lock: |
190 | unlock_dir(lower_dir_dentry); | |
191 | out: | |
b59db43a | 192 | return inode; |
237fead6 MH |
193 | } |
194 | ||
237fead6 MH |
195 | /** |
196 | * ecryptfs_initialize_file | |
197 | * | |
198 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
199 | * file with a header and first data page. | |
200 | * | |
201 | * Returns zero on success | |
202 | */ | |
b59db43a TH |
203 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, |
204 | struct inode *ecryptfs_inode) | |
237fead6 | 205 | { |
d7cdc5fe | 206 | struct ecryptfs_crypt_stat *crypt_stat = |
b59db43a | 207 | &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; |
237fead6 | 208 | int rc = 0; |
237fead6 | 209 | |
b59db43a | 210 | if (S_ISDIR(ecryptfs_inode->i_mode)) { |
237fead6 | 211 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); |
e2bd99ec | 212 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 213 | goto out; |
237fead6 | 214 | } |
237fead6 | 215 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
b59db43a | 216 | rc = ecryptfs_new_file_context(ecryptfs_inode); |
237fead6 | 217 | if (rc) { |
d7cdc5fe MH |
218 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
219 | "context; rc = [%d]\n", rc); | |
220 | goto out; | |
237fead6 | 221 | } |
b59db43a | 222 | rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); |
27992890 RS |
223 | if (rc) { |
224 | printk(KERN_ERR "%s: Error attempting to initialize " | |
332ab16f | 225 | "the lower file for the dentry with name " |
27992890 RS |
226 | "[%s]; rc = [%d]\n", __func__, |
227 | ecryptfs_dentry->d_name.name, rc); | |
228 | goto out; | |
391b52f9 | 229 | } |
b59db43a | 230 | rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); |
332ab16f | 231 | if (rc) |
d7cdc5fe | 232 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
b59db43a | 233 | ecryptfs_put_lower_file(ecryptfs_inode); |
237fead6 MH |
234 | out: |
235 | return rc; | |
236 | } | |
237 | ||
238 | /** | |
239 | * ecryptfs_create | |
240 | * @dir: The inode of the directory in which to create the file. | |
241 | * @dentry: The eCryptfs dentry | |
242 | * @mode: The mode of the new file. | |
243 | * @nd: nameidata | |
244 | * | |
245 | * Creates a new file. | |
246 | * | |
247 | * Returns zero on success; non-zero on error condition | |
248 | */ | |
249 | static int | |
250 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
4acdaf27 | 251 | umode_t mode, struct nameidata *nd) |
237fead6 | 252 | { |
b59db43a | 253 | struct inode *ecryptfs_inode; |
237fead6 MH |
254 | int rc; |
255 | ||
b59db43a TH |
256 | ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, |
257 | mode); | |
258 | if (unlikely(IS_ERR(ecryptfs_inode))) { | |
237fead6 MH |
259 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
260 | "lower filesystem\n"); | |
b59db43a | 261 | rc = PTR_ERR(ecryptfs_inode); |
237fead6 MH |
262 | goto out; |
263 | } | |
264 | /* At this point, a file exists on "disk"; we need to make sure | |
265 | * that this on disk file is prepared to be an ecryptfs file */ | |
b59db43a TH |
266 | rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); |
267 | if (rc) { | |
268 | drop_nlink(ecryptfs_inode); | |
269 | unlock_new_inode(ecryptfs_inode); | |
270 | iput(ecryptfs_inode); | |
271 | goto out; | |
272 | } | |
273 | d_instantiate(ecryptfs_dentry, ecryptfs_inode); | |
274 | unlock_new_inode(ecryptfs_inode); | |
237fead6 MH |
275 | out: |
276 | return rc; | |
277 | } | |
278 | ||
778aeb42 TH |
279 | static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) |
280 | { | |
281 | struct ecryptfs_crypt_stat *crypt_stat; | |
282 | int rc; | |
283 | ||
284 | rc = ecryptfs_get_lower_file(dentry, inode); | |
285 | if (rc) { | |
286 | printk(KERN_ERR "%s: Error attempting to initialize " | |
287 | "the lower file for the dentry with name " | |
288 | "[%s]; rc = [%d]\n", __func__, | |
289 | dentry->d_name.name, rc); | |
290 | return rc; | |
291 | } | |
292 | ||
293 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
294 | /* TODO: lock for crypt_stat comparison */ | |
295 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
296 | ecryptfs_set_default_sizes(crypt_stat); | |
297 | ||
298 | rc = ecryptfs_read_and_validate_header_region(inode); | |
299 | ecryptfs_put_lower_file(inode); | |
300 | if (rc) { | |
301 | rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); | |
302 | if (!rc) | |
303 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; | |
304 | } | |
305 | ||
306 | /* Must return 0 to allow non-eCryptfs files to be looked up, too */ | |
307 | return 0; | |
308 | } | |
309 | ||
237fead6 | 310 | /** |
5ccf9203 | 311 | * ecryptfs_lookup_interpose - Dentry interposition for a lookup |
237fead6 | 312 | */ |
778aeb42 | 313 | static int ecryptfs_lookup_interpose(struct dentry *dentry, |
5ccf9203 | 314 | struct dentry *lower_dentry, |
778aeb42 | 315 | struct inode *dir_inode) |
237fead6 | 316 | { |
778aeb42 TH |
317 | struct inode *inode, *lower_inode = lower_dentry->d_inode; |
318 | struct ecryptfs_dentry_info *dentry_info; | |
237fead6 | 319 | struct vfsmount *lower_mnt; |
778aeb42 TH |
320 | int rc = 0; |
321 | ||
322 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); | |
323 | fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode); | |
b7ab39f6 | 324 | BUG_ON(!lower_dentry->d_count); |
778aeb42 TH |
325 | |
326 | dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); | |
327 | ecryptfs_set_dentry_private(dentry, dentry_info); | |
328 | if (!dentry_info) { | |
addd65ad MH |
329 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
330 | "to allocate ecryptfs_dentry_info struct\n", | |
331 | __func__); | |
778aeb42 TH |
332 | dput(lower_dentry); |
333 | mntput(lower_mnt); | |
334 | d_drop(dentry); | |
335 | return -ENOMEM; | |
237fead6 | 336 | } |
778aeb42 TH |
337 | ecryptfs_set_dentry_lower(dentry, lower_dentry); |
338 | ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); | |
339 | ||
237fead6 MH |
340 | if (!lower_dentry->d_inode) { |
341 | /* We want to add because we couldn't find in lower */ | |
778aeb42 TH |
342 | d_add(dentry, NULL); |
343 | return 0; | |
237fead6 | 344 | } |
778aeb42 | 345 | inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); |
5ccf9203 | 346 | if (IS_ERR(inode)) { |
778aeb42 TH |
347 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", |
348 | __func__, PTR_ERR(inode)); | |
349 | return PTR_ERR(inode); | |
391b52f9 | 350 | } |
778aeb42 TH |
351 | if (S_ISREG(inode->i_mode)) { |
352 | rc = ecryptfs_i_size_read(dentry, inode); | |
dd2a3b7a | 353 | if (rc) { |
778aeb42 TH |
354 | make_bad_inode(inode); |
355 | return rc; | |
237fead6 | 356 | } |
237fead6 | 357 | } |
778aeb42 | 358 | |
3b06b3eb TH |
359 | if (inode->i_state & I_NEW) |
360 | unlock_new_inode(inode); | |
778aeb42 TH |
361 | d_add(dentry, inode); |
362 | ||
addd65ad MH |
363 | return rc; |
364 | } | |
365 | ||
366 | /** | |
367 | * ecryptfs_lookup | |
368 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
369 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
370 | * @ecryptfs_nd: nameidata; may be NULL | |
371 | * | |
372 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
373 | * dentry cache and continue on to read it from the disk. | |
374 | */ | |
375 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
376 | struct dentry *ecryptfs_dentry, | |
377 | struct nameidata *ecryptfs_nd) | |
378 | { | |
379 | char *encrypted_and_encoded_name = NULL; | |
a8f12864 | 380 | size_t encrypted_and_encoded_name_size; |
addd65ad | 381 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
addd65ad MH |
382 | struct dentry *lower_dir_dentry, *lower_dentry; |
383 | int rc = 0; | |
384 | ||
addd65ad MH |
385 | if ((ecryptfs_dentry->d_name.len == 1 |
386 | && !strcmp(ecryptfs_dentry->d_name.name, ".")) | |
387 | || (ecryptfs_dentry->d_name.len == 2 | |
388 | && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { | |
389 | goto out_d_drop; | |
390 | } | |
391 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); | |
8787c7a3 TH |
392 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
393 | lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, | |
394 | lower_dir_dentry, | |
395 | ecryptfs_dentry->d_name.len); | |
396 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
397 | if (IS_ERR(lower_dentry)) { |
398 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 399 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
400 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
401 | encrypted_and_encoded_name); | |
addd65ad MH |
402 | goto out_d_drop; |
403 | } | |
404 | if (lower_dentry->d_inode) | |
5ccf9203 | 405 | goto interpose; |
2aac0cf8 TH |
406 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
407 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
408 | if (!(mount_crypt_stat | |
409 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) | |
5ccf9203 | 410 | goto interpose; |
addd65ad MH |
411 | dput(lower_dentry); |
412 | rc = ecryptfs_encrypt_and_encode_filename( | |
413 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, | |
2aac0cf8 | 414 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
addd65ad MH |
415 | ecryptfs_dentry->d_name.len); |
416 | if (rc) { | |
417 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
418 | "filename; rc = [%d]\n", __func__, rc); | |
419 | goto out_d_drop; | |
420 | } | |
8787c7a3 TH |
421 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
422 | lower_dentry = lookup_one_len(encrypted_and_encoded_name, | |
423 | lower_dir_dentry, | |
424 | encrypted_and_encoded_name_size); | |
425 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
426 | if (IS_ERR(lower_dentry)) { |
427 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 428 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
429 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
430 | encrypted_and_encoded_name); | |
addd65ad MH |
431 | goto out_d_drop; |
432 | } | |
5ccf9203 TH |
433 | interpose: |
434 | rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, | |
435 | ecryptfs_dir_inode); | |
addd65ad MH |
436 | goto out; |
437 | out_d_drop: | |
438 | d_drop(ecryptfs_dentry); | |
237fead6 | 439 | out: |
addd65ad | 440 | kfree(encrypted_and_encoded_name); |
237fead6 MH |
441 | return ERR_PTR(rc); |
442 | } | |
443 | ||
444 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
445 | struct dentry *new_dentry) | |
446 | { | |
447 | struct dentry *lower_old_dentry; | |
448 | struct dentry *lower_new_dentry; | |
449 | struct dentry *lower_dir_dentry; | |
450 | u64 file_size_save; | |
451 | int rc; | |
452 | ||
453 | file_size_save = i_size_read(old_dentry->d_inode); | |
454 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
455 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
456 | dget(lower_old_dentry); | |
457 | dget(lower_new_dentry); | |
458 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
459 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
460 | lower_new_dentry); | |
461 | if (rc || !lower_new_dentry->d_inode) | |
462 | goto out_lock; | |
5ccf9203 | 463 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
237fead6 MH |
464 | if (rc) |
465 | goto out_lock; | |
3a8380c0 TH |
466 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
467 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
bfe86848 MS |
468 | set_nlink(old_dentry->d_inode, |
469 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink); | |
237fead6 MH |
470 | i_size_write(new_dentry->d_inode, file_size_save); |
471 | out_lock: | |
472 | unlock_dir(lower_dir_dentry); | |
473 | dput(lower_new_dentry); | |
474 | dput(lower_old_dentry); | |
237fead6 MH |
475 | return rc; |
476 | } | |
477 | ||
478 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
479 | { | |
480 | int rc = 0; | |
481 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
482 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
8dc4e373 | 483 | struct dentry *lower_dir_dentry; |
237fead6 | 484 | |
9c2d2056 | 485 | dget(lower_dentry); |
8dc4e373 | 486 | lower_dir_dentry = lock_parent(lower_dentry); |
237fead6 MH |
487 | rc = vfs_unlink(lower_dir_inode, lower_dentry); |
488 | if (rc) { | |
ae56fb16 | 489 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
490 | goto out_unlock; |
491 | } | |
0cc72dc7 | 492 | fsstack_copy_attr_times(dir, lower_dir_inode); |
bfe86848 MS |
493 | set_nlink(dentry->d_inode, |
494 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink); | |
237fead6 | 495 | dentry->d_inode->i_ctime = dir->i_ctime; |
caeeeecf | 496 | d_drop(dentry); |
237fead6 | 497 | out_unlock: |
8dc4e373 | 498 | unlock_dir(lower_dir_dentry); |
9c2d2056 | 499 | dput(lower_dentry); |
237fead6 MH |
500 | return rc; |
501 | } | |
502 | ||
503 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
504 | const char *symname) | |
505 | { | |
506 | int rc; | |
507 | struct dentry *lower_dentry; | |
508 | struct dentry *lower_dir_dentry; | |
237fead6 | 509 | char *encoded_symname; |
addd65ad MH |
510 | size_t encoded_symlen; |
511 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
512 | |
513 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
514 | dget(lower_dentry); | |
515 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
516 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
517 | dir->i_sb)->mount_crypt_stat; | |
518 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
519 | &encoded_symlen, | |
520 | NULL, | |
521 | mount_crypt_stat, symname, | |
522 | strlen(symname)); | |
523 | if (rc) | |
237fead6 | 524 | goto out_lock; |
237fead6 | 525 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, |
db2e747b | 526 | encoded_symname); |
237fead6 MH |
527 | kfree(encoded_symname); |
528 | if (rc || !lower_dentry->d_inode) | |
529 | goto out_lock; | |
5ccf9203 | 530 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
531 | if (rc) |
532 | goto out_lock; | |
0cc72dc7 JJS |
533 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
534 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
535 | out_lock: |
536 | unlock_dir(lower_dir_dentry); | |
537 | dput(lower_dentry); | |
538 | if (!dentry->d_inode) | |
539 | d_drop(dentry); | |
540 | return rc; | |
541 | } | |
542 | ||
18bb1db3 | 543 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
237fead6 MH |
544 | { |
545 | int rc; | |
546 | struct dentry *lower_dentry; | |
547 | struct dentry *lower_dir_dentry; | |
548 | ||
549 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
550 | lower_dir_dentry = lock_parent(lower_dentry); | |
551 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
552 | if (rc || !lower_dentry->d_inode) | |
553 | goto out; | |
5ccf9203 | 554 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
555 | if (rc) |
556 | goto out; | |
0cc72dc7 JJS |
557 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
558 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
bfe86848 | 559 | set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); |
237fead6 MH |
560 | out: |
561 | unlock_dir(lower_dir_dentry); | |
562 | if (!dentry->d_inode) | |
563 | d_drop(dentry); | |
564 | return rc; | |
565 | } | |
566 | ||
567 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
568 | { | |
237fead6 | 569 | struct dentry *lower_dentry; |
237fead6 | 570 | struct dentry *lower_dir_dentry; |
45ec4aba | 571 | int rc; |
237fead6 MH |
572 | |
573 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 574 | dget(dentry); |
237fead6 | 575 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 576 | dget(lower_dentry); |
237fead6 | 577 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba | 578 | dput(lower_dentry); |
07850552 TH |
579 | if (!rc && dentry->d_inode) |
580 | clear_nlink(dentry->d_inode); | |
0cc72dc7 | 581 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
bfe86848 | 582 | set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); |
237fead6 MH |
583 | unlock_dir(lower_dir_dentry); |
584 | if (!rc) | |
585 | d_drop(dentry); | |
45ec4aba | 586 | dput(dentry); |
237fead6 MH |
587 | return rc; |
588 | } | |
589 | ||
590 | static int | |
1a67aafb | 591 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
237fead6 MH |
592 | { |
593 | int rc; | |
594 | struct dentry *lower_dentry; | |
595 | struct dentry *lower_dir_dentry; | |
596 | ||
597 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
598 | lower_dir_dentry = lock_parent(lower_dentry); | |
599 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
600 | if (rc || !lower_dentry->d_inode) | |
601 | goto out; | |
5ccf9203 | 602 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
603 | if (rc) |
604 | goto out; | |
0cc72dc7 JJS |
605 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
606 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
607 | out: |
608 | unlock_dir(lower_dir_dentry); | |
609 | if (!dentry->d_inode) | |
610 | d_drop(dentry); | |
611 | return rc; | |
612 | } | |
613 | ||
614 | static int | |
615 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
616 | struct inode *new_dir, struct dentry *new_dentry) | |
617 | { | |
618 | int rc; | |
619 | struct dentry *lower_old_dentry; | |
620 | struct dentry *lower_new_dentry; | |
621 | struct dentry *lower_old_dir_dentry; | |
622 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 623 | struct dentry *trap = NULL; |
237fead6 MH |
624 | |
625 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
626 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
627 | dget(lower_old_dentry); | |
628 | dget(lower_new_dentry); | |
629 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
630 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
0d132f73 EZ |
631 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
632 | /* source should not be ancestor of target */ | |
633 | if (trap == lower_old_dentry) { | |
634 | rc = -EINVAL; | |
635 | goto out_lock; | |
636 | } | |
637 | /* target should not be ancestor of source */ | |
638 | if (trap == lower_new_dentry) { | |
639 | rc = -ENOTEMPTY; | |
640 | goto out_lock; | |
641 | } | |
237fead6 MH |
642 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, |
643 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
644 | if (rc) | |
645 | goto out_lock; | |
9afa2fb6 | 646 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); |
237fead6 | 647 | if (new_dir != old_dir) |
9afa2fb6 | 648 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); |
237fead6 MH |
649 | out_lock: |
650 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
dd55c898 TH |
651 | dput(lower_new_dir_dentry); |
652 | dput(lower_old_dir_dentry); | |
237fead6 MH |
653 | dput(lower_new_dentry); |
654 | dput(lower_old_dentry); | |
655 | return rc; | |
656 | } | |
657 | ||
3a60a168 TH |
658 | static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, |
659 | size_t *bufsiz) | |
237fead6 | 660 | { |
3a60a168 | 661 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
237fead6 | 662 | char *lower_buf; |
addd65ad MH |
663 | mm_segment_t old_fs; |
664 | int rc; | |
237fead6 | 665 | |
408bd629 | 666 | lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); |
3a60a168 | 667 | if (!lower_buf) { |
237fead6 MH |
668 | rc = -ENOMEM; |
669 | goto out; | |
670 | } | |
671 | old_fs = get_fs(); | |
672 | set_fs(get_ds()); | |
237fead6 MH |
673 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, |
674 | (char __user *)lower_buf, | |
408bd629 | 675 | PATH_MAX); |
237fead6 | 676 | set_fs(old_fs); |
3a60a168 TH |
677 | if (rc < 0) |
678 | goto out; | |
3a60a168 | 679 | rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, |
408bd629 | 680 | lower_buf, rc); |
3a60a168 | 681 | out: |
237fead6 | 682 | kfree(lower_buf); |
3a60a168 TH |
683 | return rc; |
684 | } | |
685 | ||
408bd629 | 686 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) |
3a60a168 | 687 | { |
408bd629 AV |
688 | char *buf; |
689 | size_t len = PATH_MAX; | |
3a60a168 TH |
690 | int rc; |
691 | ||
408bd629 | 692 | rc = ecryptfs_readlink_lower(dentry, &buf, &len); |
3a60a168 TH |
693 | if (rc) |
694 | goto out; | |
3a60a168 TH |
695 | fsstack_copy_attr_atime(dentry->d_inode, |
696 | ecryptfs_dentry_to_lower(dentry)->d_inode); | |
408bd629 | 697 | buf[len] = '\0'; |
237fead6 | 698 | out: |
806892e9 OH |
699 | nd_set_link(nd, buf); |
700 | return NULL; | |
237fead6 MH |
701 | } |
702 | ||
703 | static void | |
704 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
705 | { | |
806892e9 OH |
706 | char *buf = nd_get_link(nd); |
707 | if (!IS_ERR(buf)) { | |
708 | /* Free the char* */ | |
709 | kfree(buf); | |
710 | } | |
237fead6 MH |
711 | } |
712 | ||
713 | /** | |
714 | * upper_size_to_lower_size | |
715 | * @crypt_stat: Crypt_stat associated with file | |
716 | * @upper_size: Size of the upper file | |
717 | * | |
cc11beff | 718 | * Calculate the required size of the lower file based on the |
237fead6 MH |
719 | * specified size of the upper file. This calculation is based on the |
720 | * number of headers in the underlying file and the extent size. | |
721 | * | |
722 | * Returns Calculated size of the lower file. | |
723 | */ | |
724 | static loff_t | |
725 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
726 | loff_t upper_size) | |
727 | { | |
728 | loff_t lower_size; | |
729 | ||
157f1071 | 730 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
731 | if (upper_size != 0) { |
732 | loff_t num_extents; | |
733 | ||
734 | num_extents = upper_size >> crypt_stat->extent_shift; | |
735 | if (upper_size & ~crypt_stat->extent_mask) | |
736 | num_extents++; | |
737 | lower_size += (num_extents * crypt_stat->extent_size); | |
738 | } | |
739 | return lower_size; | |
740 | } | |
741 | ||
742 | /** | |
5f3ef64f | 743 | * truncate_upper |
237fead6 | 744 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
745 | * @ia: Address of the ecryptfs inode's attributes |
746 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
747 | * |
748 | * Function to handle truncations modifying the size of the file. Note | |
749 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
750 | * writing strings of 0's out. When truncating, we truncate the upper |
751 | * inode and update the lower_ia according to the page index | |
752 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
753 | * the caller must use lower_ia in a call to notify_change() to perform | |
754 | * the truncation of the lower inode. | |
237fead6 MH |
755 | * |
756 | * Returns zero on success; non-zero otherwise | |
757 | */ | |
5f3ef64f TH |
758 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
759 | struct iattr *lower_ia) | |
237fead6 MH |
760 | { |
761 | int rc = 0; | |
762 | struct inode *inode = dentry->d_inode; | |
237fead6 MH |
763 | struct ecryptfs_crypt_stat *crypt_stat; |
764 | loff_t i_size = i_size_read(inode); | |
765 | loff_t lower_size_before_truncate; | |
766 | loff_t lower_size_after_truncate; | |
767 | ||
5f3ef64f TH |
768 | if (unlikely((ia->ia_size == i_size))) { |
769 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 770 | return 0; |
5f3ef64f | 771 | } |
3b06b3eb | 772 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
773 | if (rc) |
774 | return rc; | |
237fead6 | 775 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
237fead6 | 776 | /* Switch on growing or shrinking file */ |
5f3ef64f | 777 | if (ia->ia_size > i_size) { |
2ed92554 MH |
778 | char zero[] = { 0x00 }; |
779 | ||
5f3ef64f | 780 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
781 | /* Write a single 0 at the last position of the file; |
782 | * this triggers code that will fill in 0's throughout | |
783 | * the intermediate portion of the previous end of the | |
784 | * file and the new and of the file */ | |
48c1e44a | 785 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
786 | (ia->ia_size - 1), 1); |
787 | } else { /* ia->ia_size < i_size_read(inode) */ | |
788 | /* We're chopping off all the pages down to the page | |
789 | * in which ia->ia_size is located. Fill in the end of | |
790 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to | |
2ed92554 MH |
791 | * PAGE_CACHE_SIZE with zeros. */ |
792 | size_t num_zeros = (PAGE_CACHE_SIZE | |
5f3ef64f | 793 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
2ed92554 | 794 | |
13a791b4 | 795 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 796 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
797 | lower_ia->ia_size = ia->ia_size; |
798 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 799 | goto out; |
13a791b4 | 800 | } |
2ed92554 MH |
801 | if (num_zeros) { |
802 | char *zeros_virt; | |
803 | ||
804 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
805 | if (!zeros_virt) { | |
806 | rc = -ENOMEM; | |
48c1e44a | 807 | goto out; |
2ed92554 | 808 | } |
48c1e44a | 809 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 810 | ia->ia_size, num_zeros); |
2ed92554 | 811 | kfree(zeros_virt); |
5dda6992 | 812 | if (rc) { |
240e2df5 MH |
813 | printk(KERN_ERR "Error attempting to zero out " |
814 | "the remainder of the end page on " | |
815 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 816 | goto out; |
240e2df5 MH |
817 | } |
818 | } | |
2c27c65e | 819 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 820 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
821 | if (rc) { |
822 | printk(KERN_ERR "Problem with " | |
823 | "ecryptfs_write_inode_size_to_metadata; " | |
824 | "rc = [%d]\n", rc); | |
48c1e44a | 825 | goto out; |
dd2a3b7a | 826 | } |
237fead6 MH |
827 | /* We are reducing the size of the ecryptfs file, and need to |
828 | * know if we need to reduce the size of the lower file. */ | |
829 | lower_size_before_truncate = | |
830 | upper_size_to_lower_size(crypt_stat, i_size); | |
831 | lower_size_after_truncate = | |
5f3ef64f TH |
832 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
833 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
834 | lower_ia->ia_size = lower_size_after_truncate; | |
835 | lower_ia->ia_valid |= ATTR_SIZE; | |
836 | } else | |
837 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 838 | } |
237fead6 | 839 | out: |
332ab16f | 840 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
841 | return rc; |
842 | } | |
843 | ||
a261a039 TH |
844 | static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) |
845 | { | |
846 | struct ecryptfs_crypt_stat *crypt_stat; | |
847 | loff_t lower_oldsize, lower_newsize; | |
848 | ||
849 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
850 | lower_oldsize = upper_size_to_lower_size(crypt_stat, | |
851 | i_size_read(inode)); | |
852 | lower_newsize = upper_size_to_lower_size(crypt_stat, offset); | |
853 | if (lower_newsize > lower_oldsize) { | |
854 | /* | |
855 | * The eCryptfs inode and the new *lower* size are mixed here | |
856 | * because we may not have the lower i_mutex held and/or it may | |
857 | * not be appropriate to call inode_newsize_ok() with inodes | |
858 | * from other filesystems. | |
859 | */ | |
860 | return inode_newsize_ok(inode, lower_newsize); | |
861 | } | |
862 | ||
863 | return 0; | |
864 | } | |
865 | ||
5f3ef64f TH |
866 | /** |
867 | * ecryptfs_truncate | |
868 | * @dentry: The ecryptfs layer dentry | |
869 | * @new_length: The length to expand the file to | |
870 | * | |
871 | * Simple function that handles the truncation of an eCryptfs inode and | |
872 | * its corresponding lower inode. | |
873 | * | |
874 | * Returns zero on success; non-zero otherwise | |
875 | */ | |
876 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
877 | { | |
878 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
879 | struct iattr lower_ia = { .ia_valid = 0 }; | |
880 | int rc; | |
881 | ||
a261a039 TH |
882 | rc = ecryptfs_inode_newsize_ok(dentry->d_inode, new_length); |
883 | if (rc) | |
884 | return rc; | |
885 | ||
5f3ef64f TH |
886 | rc = truncate_upper(dentry, &ia, &lower_ia); |
887 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
888 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
889 | ||
890 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
891 | rc = notify_change(lower_dentry, &lower_ia); | |
892 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
893 | } | |
894 | return rc; | |
895 | } | |
896 | ||
237fead6 | 897 | static int |
10556cb2 | 898 | ecryptfs_permission(struct inode *inode, int mask) |
237fead6 | 899 | { |
f419a2e3 | 900 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
901 | } |
902 | ||
903 | /** | |
904 | * ecryptfs_setattr | |
905 | * @dentry: dentry handle to the inode to modify | |
906 | * @ia: Structure with flags of what to change and values | |
907 | * | |
908 | * Updates the metadata of an inode. If the update is to the size | |
909 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
910 | * of both the ecryptfs inode and the lower inode. | |
911 | * | |
912 | * All other metadata changes will be passed right to the lower filesystem, | |
913 | * and we will just update our inode to look like the lower. | |
914 | */ | |
915 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
916 | { | |
917 | int rc = 0; | |
918 | struct dentry *lower_dentry; | |
5f3ef64f | 919 | struct iattr lower_ia; |
237fead6 MH |
920 | struct inode *inode; |
921 | struct inode *lower_inode; | |
922 | struct ecryptfs_crypt_stat *crypt_stat; | |
923 | ||
924 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
925 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
926 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
927 | inode = dentry->d_inode; |
928 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
929 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
930 | mutex_lock(&crypt_stat->cs_mutex); | |
931 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
932 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
933 | else if (S_ISREG(dentry->d_inode->i_mode) |
934 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
935 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 936 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 937 | |
e10f281b MH |
938 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
939 | dentry->d_sb)->mount_crypt_stat; | |
3b06b3eb | 940 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
941 | if (rc) { |
942 | mutex_unlock(&crypt_stat->cs_mutex); | |
943 | goto out; | |
944 | } | |
d7cdc5fe | 945 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 946 | ecryptfs_put_lower_file(inode); |
5dda6992 | 947 | if (rc) { |
e10f281b MH |
948 | if (!(mount_crypt_stat->flags |
949 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
950 | rc = -EIO; | |
25bd8174 | 951 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 952 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
953 | "or the key could not be retrieved. " |
954 | "Plaintext passthrough mode is not " | |
e10f281b | 955 | "enabled; returning -EIO\n"); |
e10f281b | 956 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
957 | goto out; |
958 | } | |
959 | rc = 0; | |
3aeb86ea TH |
960 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
961 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 962 | } |
e10f281b MH |
963 | } |
964 | mutex_unlock(&crypt_stat->cs_mutex); | |
a261a039 TH |
965 | |
966 | rc = inode_change_ok(inode, ia); | |
967 | if (rc) | |
968 | goto out; | |
969 | if (ia->ia_valid & ATTR_SIZE) { | |
970 | rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); | |
971 | if (rc) | |
972 | goto out; | |
973 | } | |
974 | ||
5be79de2 TH |
975 | if (S_ISREG(inode->i_mode)) { |
976 | rc = filemap_write_and_wait(inode->i_mapping); | |
977 | if (rc) | |
978 | goto out; | |
979 | fsstack_copy_attr_all(inode, lower_inode); | |
980 | } | |
5f3ef64f TH |
981 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
982 | if (ia->ia_valid & ATTR_FILE) | |
983 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 984 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 985 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
986 | if (rc < 0) |
987 | goto out; | |
988 | } | |
1ac564ec JL |
989 | |
990 | /* | |
991 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
992 | * to interpret this in its own way. | |
993 | */ | |
5f3ef64f TH |
994 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
995 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 996 | |
9c3580aa | 997 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
5f3ef64f | 998 | rc = notify_change(lower_dentry, &lower_ia); |
9c3580aa | 999 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
237fead6 | 1000 | out: |
9afa2fb6 | 1001 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
1002 | return rc; |
1003 | } | |
1004 | ||
3a60a168 TH |
1005 | int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
1006 | struct kstat *stat) | |
1007 | { | |
1008 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; | |
1009 | int rc = 0; | |
1010 | ||
1011 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
1012 | dentry->d_sb)->mount_crypt_stat; | |
1013 | generic_fillattr(dentry->d_inode, stat); | |
1014 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { | |
1015 | char *target; | |
1016 | size_t targetsiz; | |
1017 | ||
1018 | rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); | |
1019 | if (!rc) { | |
1020 | kfree(target); | |
1021 | stat->size = targetsiz; | |
1022 | } | |
1023 | } | |
1024 | return rc; | |
1025 | } | |
1026 | ||
f8f484d1 TH |
1027 | int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1028 | struct kstat *stat) | |
1029 | { | |
1030 | struct kstat lower_stat; | |
1031 | int rc; | |
1032 | ||
1033 | rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), | |
1034 | ecryptfs_dentry_to_lower(dentry), &lower_stat); | |
1035 | if (!rc) { | |
55f9cf6b TH |
1036 | fsstack_copy_attr_all(dentry->d_inode, |
1037 | ecryptfs_inode_to_lower(dentry->d_inode)); | |
f8f484d1 TH |
1038 | generic_fillattr(dentry->d_inode, stat); |
1039 | stat->blocks = lower_stat.blocks; | |
1040 | } | |
1041 | return rc; | |
1042 | } | |
1043 | ||
dd2a3b7a | 1044 | int |
237fead6 MH |
1045 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
1046 | size_t size, int flags) | |
1047 | { | |
1048 | int rc = 0; | |
1049 | struct dentry *lower_dentry; | |
1050 | ||
1051 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1052 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
cfce08c6 | 1053 | rc = -EOPNOTSUPP; |
237fead6 MH |
1054 | goto out; |
1055 | } | |
48b512e6 RS |
1056 | |
1057 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); | |
545d6809 TH |
1058 | if (!rc) |
1059 | fsstack_copy_attr_all(dentry->d_inode, lower_dentry->d_inode); | |
237fead6 MH |
1060 | out: |
1061 | return rc; | |
1062 | } | |
1063 | ||
d7cdc5fe MH |
1064 | ssize_t |
1065 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
1066 | void *value, size_t size) | |
1067 | { | |
1068 | int rc = 0; | |
1069 | ||
1070 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
cfce08c6 | 1071 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1072 | goto out; |
1073 | } | |
1074 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1075 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
1076 | size); | |
1077 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1078 | out: | |
1079 | return rc; | |
1080 | } | |
1081 | ||
7896b631 | 1082 | static ssize_t |
237fead6 MH |
1083 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
1084 | size_t size) | |
1085 | { | |
2ed92554 MH |
1086 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
1087 | value, size); | |
237fead6 MH |
1088 | } |
1089 | ||
1090 | static ssize_t | |
1091 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1092 | { | |
1093 | int rc = 0; | |
1094 | struct dentry *lower_dentry; | |
1095 | ||
1096 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1097 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
cfce08c6 | 1098 | rc = -EOPNOTSUPP; |
237fead6 MH |
1099 | goto out; |
1100 | } | |
1101 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1102 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
1103 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1104 | out: | |
1105 | return rc; | |
1106 | } | |
1107 | ||
1108 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
1109 | { | |
1110 | int rc = 0; | |
1111 | struct dentry *lower_dentry; | |
1112 | ||
1113 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1114 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
cfce08c6 | 1115 | rc = -EOPNOTSUPP; |
237fead6 MH |
1116 | goto out; |
1117 | } | |
1118 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1119 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
1120 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1121 | out: | |
1122 | return rc; | |
1123 | } | |
1124 | ||
754661f1 | 1125 | const struct inode_operations ecryptfs_symlink_iops = { |
408bd629 | 1126 | .readlink = generic_readlink, |
237fead6 MH |
1127 | .follow_link = ecryptfs_follow_link, |
1128 | .put_link = ecryptfs_put_link, | |
1129 | .permission = ecryptfs_permission, | |
1130 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1131 | .getattr = ecryptfs_getattr_link, |
237fead6 MH |
1132 | .setxattr = ecryptfs_setxattr, |
1133 | .getxattr = ecryptfs_getxattr, | |
1134 | .listxattr = ecryptfs_listxattr, | |
1135 | .removexattr = ecryptfs_removexattr | |
1136 | }; | |
1137 | ||
754661f1 | 1138 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1139 | .create = ecryptfs_create, |
1140 | .lookup = ecryptfs_lookup, | |
1141 | .link = ecryptfs_link, | |
1142 | .unlink = ecryptfs_unlink, | |
1143 | .symlink = ecryptfs_symlink, | |
1144 | .mkdir = ecryptfs_mkdir, | |
1145 | .rmdir = ecryptfs_rmdir, | |
1146 | .mknod = ecryptfs_mknod, | |
1147 | .rename = ecryptfs_rename, | |
1148 | .permission = ecryptfs_permission, | |
1149 | .setattr = ecryptfs_setattr, | |
1150 | .setxattr = ecryptfs_setxattr, | |
1151 | .getxattr = ecryptfs_getxattr, | |
1152 | .listxattr = ecryptfs_listxattr, | |
1153 | .removexattr = ecryptfs_removexattr | |
1154 | }; | |
1155 | ||
754661f1 | 1156 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1157 | .permission = ecryptfs_permission, |
1158 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1159 | .getattr = ecryptfs_getattr, |
237fead6 MH |
1160 | .setxattr = ecryptfs_setxattr, |
1161 | .getxattr = ecryptfs_getxattr, | |
1162 | .listxattr = ecryptfs_listxattr, | |
1163 | .removexattr = ecryptfs_removexattr | |
1164 | }; |