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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 | } | |
312b63fb | 176 | rc = vfs_create(lower_dir_dentry->d_inode, lower_dentry, mode, true); |
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. | |
237fead6 MH |
243 | * |
244 | * Creates a new file. | |
245 | * | |
246 | * Returns zero on success; non-zero on error condition | |
247 | */ | |
248 | static int | |
249 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
ebfc3b49 | 250 | umode_t mode, bool excl) |
237fead6 | 251 | { |
b59db43a | 252 | struct inode *ecryptfs_inode; |
237fead6 MH |
253 | int rc; |
254 | ||
b59db43a TH |
255 | ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, |
256 | mode); | |
257 | if (unlikely(IS_ERR(ecryptfs_inode))) { | |
237fead6 MH |
258 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
259 | "lower filesystem\n"); | |
b59db43a | 260 | rc = PTR_ERR(ecryptfs_inode); |
237fead6 MH |
261 | goto out; |
262 | } | |
263 | /* At this point, a file exists on "disk"; we need to make sure | |
264 | * that this on disk file is prepared to be an ecryptfs file */ | |
b59db43a TH |
265 | rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); |
266 | if (rc) { | |
267 | drop_nlink(ecryptfs_inode); | |
268 | unlock_new_inode(ecryptfs_inode); | |
269 | iput(ecryptfs_inode); | |
270 | goto out; | |
271 | } | |
b59db43a | 272 | unlock_new_inode(ecryptfs_inode); |
8fc37ec5 | 273 | d_instantiate(ecryptfs_dentry, ecryptfs_inode); |
237fead6 MH |
274 | out: |
275 | return rc; | |
276 | } | |
277 | ||
778aeb42 TH |
278 | static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) |
279 | { | |
280 | struct ecryptfs_crypt_stat *crypt_stat; | |
281 | int rc; | |
282 | ||
283 | rc = ecryptfs_get_lower_file(dentry, inode); | |
284 | if (rc) { | |
285 | printk(KERN_ERR "%s: Error attempting to initialize " | |
286 | "the lower file for the dentry with name " | |
287 | "[%s]; rc = [%d]\n", __func__, | |
288 | dentry->d_name.name, rc); | |
289 | return rc; | |
290 | } | |
291 | ||
292 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
293 | /* TODO: lock for crypt_stat comparison */ | |
294 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
295 | ecryptfs_set_default_sizes(crypt_stat); | |
296 | ||
297 | rc = ecryptfs_read_and_validate_header_region(inode); | |
298 | ecryptfs_put_lower_file(inode); | |
299 | if (rc) { | |
300 | rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); | |
301 | if (!rc) | |
302 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; | |
303 | } | |
304 | ||
305 | /* Must return 0 to allow non-eCryptfs files to be looked up, too */ | |
306 | return 0; | |
307 | } | |
308 | ||
237fead6 | 309 | /** |
5ccf9203 | 310 | * ecryptfs_lookup_interpose - Dentry interposition for a lookup |
237fead6 | 311 | */ |
778aeb42 | 312 | static int ecryptfs_lookup_interpose(struct dentry *dentry, |
5ccf9203 | 313 | struct dentry *lower_dentry, |
778aeb42 | 314 | struct inode *dir_inode) |
237fead6 | 315 | { |
778aeb42 TH |
316 | struct inode *inode, *lower_inode = lower_dentry->d_inode; |
317 | struct ecryptfs_dentry_info *dentry_info; | |
237fead6 | 318 | struct vfsmount *lower_mnt; |
778aeb42 TH |
319 | int rc = 0; |
320 | ||
321 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); | |
322 | fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode); | |
b7ab39f6 | 323 | BUG_ON(!lower_dentry->d_count); |
778aeb42 TH |
324 | |
325 | dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); | |
326 | ecryptfs_set_dentry_private(dentry, dentry_info); | |
327 | if (!dentry_info) { | |
addd65ad MH |
328 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
329 | "to allocate ecryptfs_dentry_info struct\n", | |
330 | __func__); | |
778aeb42 TH |
331 | dput(lower_dentry); |
332 | mntput(lower_mnt); | |
333 | d_drop(dentry); | |
334 | return -ENOMEM; | |
237fead6 | 335 | } |
778aeb42 TH |
336 | ecryptfs_set_dentry_lower(dentry, lower_dentry); |
337 | ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); | |
338 | ||
237fead6 MH |
339 | if (!lower_dentry->d_inode) { |
340 | /* We want to add because we couldn't find in lower */ | |
778aeb42 TH |
341 | d_add(dentry, NULL); |
342 | return 0; | |
237fead6 | 343 | } |
778aeb42 | 344 | inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); |
5ccf9203 | 345 | if (IS_ERR(inode)) { |
778aeb42 TH |
346 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", |
347 | __func__, PTR_ERR(inode)); | |
348 | return PTR_ERR(inode); | |
391b52f9 | 349 | } |
778aeb42 TH |
350 | if (S_ISREG(inode->i_mode)) { |
351 | rc = ecryptfs_i_size_read(dentry, inode); | |
dd2a3b7a | 352 | if (rc) { |
778aeb42 TH |
353 | make_bad_inode(inode); |
354 | return rc; | |
237fead6 | 355 | } |
237fead6 | 356 | } |
778aeb42 | 357 | |
3b06b3eb TH |
358 | if (inode->i_state & I_NEW) |
359 | unlock_new_inode(inode); | |
778aeb42 TH |
360 | d_add(dentry, inode); |
361 | ||
addd65ad MH |
362 | return rc; |
363 | } | |
364 | ||
365 | /** | |
366 | * ecryptfs_lookup | |
367 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
368 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
369 | * @ecryptfs_nd: nameidata; may be NULL | |
370 | * | |
371 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
372 | * dentry cache and continue on to read it from the disk. | |
373 | */ | |
374 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
375 | struct dentry *ecryptfs_dentry, | |
00cd8dd3 | 376 | unsigned int flags) |
addd65ad MH |
377 | { |
378 | char *encrypted_and_encoded_name = NULL; | |
a8f12864 | 379 | size_t encrypted_and_encoded_name_size; |
addd65ad | 380 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
addd65ad MH |
381 | struct dentry *lower_dir_dentry, *lower_dentry; |
382 | int rc = 0; | |
383 | ||
addd65ad MH |
384 | if ((ecryptfs_dentry->d_name.len == 1 |
385 | && !strcmp(ecryptfs_dentry->d_name.name, ".")) | |
386 | || (ecryptfs_dentry->d_name.len == 2 | |
387 | && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { | |
388 | goto out_d_drop; | |
389 | } | |
390 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); | |
8787c7a3 TH |
391 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
392 | lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, | |
393 | lower_dir_dentry, | |
394 | ecryptfs_dentry->d_name.len); | |
395 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
396 | if (IS_ERR(lower_dentry)) { |
397 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 398 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
399 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
400 | encrypted_and_encoded_name); | |
addd65ad MH |
401 | goto out_d_drop; |
402 | } | |
403 | if (lower_dentry->d_inode) | |
5ccf9203 | 404 | goto interpose; |
2aac0cf8 TH |
405 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
406 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
407 | if (!(mount_crypt_stat | |
408 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) | |
5ccf9203 | 409 | goto interpose; |
addd65ad MH |
410 | dput(lower_dentry); |
411 | rc = ecryptfs_encrypt_and_encode_filename( | |
412 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, | |
2aac0cf8 | 413 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
addd65ad MH |
414 | ecryptfs_dentry->d_name.len); |
415 | if (rc) { | |
416 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
417 | "filename; rc = [%d]\n", __func__, rc); | |
418 | goto out_d_drop; | |
419 | } | |
8787c7a3 TH |
420 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
421 | lower_dentry = lookup_one_len(encrypted_and_encoded_name, | |
422 | lower_dir_dentry, | |
423 | encrypted_and_encoded_name_size); | |
424 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
425 | if (IS_ERR(lower_dentry)) { |
426 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 427 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
428 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
429 | encrypted_and_encoded_name); | |
addd65ad MH |
430 | goto out_d_drop; |
431 | } | |
5ccf9203 TH |
432 | interpose: |
433 | rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, | |
434 | ecryptfs_dir_inode); | |
addd65ad MH |
435 | goto out; |
436 | out_d_drop: | |
437 | d_drop(ecryptfs_dentry); | |
237fead6 | 438 | out: |
addd65ad | 439 | kfree(encrypted_and_encoded_name); |
237fead6 MH |
440 | return ERR_PTR(rc); |
441 | } | |
442 | ||
443 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
444 | struct dentry *new_dentry) | |
445 | { | |
446 | struct dentry *lower_old_dentry; | |
447 | struct dentry *lower_new_dentry; | |
448 | struct dentry *lower_dir_dentry; | |
449 | u64 file_size_save; | |
450 | int rc; | |
451 | ||
452 | file_size_save = i_size_read(old_dentry->d_inode); | |
453 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
454 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
455 | dget(lower_old_dentry); | |
456 | dget(lower_new_dentry); | |
457 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
458 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
459 | lower_new_dentry); | |
460 | if (rc || !lower_new_dentry->d_inode) | |
461 | goto out_lock; | |
5ccf9203 | 462 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
237fead6 MH |
463 | if (rc) |
464 | goto out_lock; | |
3a8380c0 TH |
465 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
466 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
bfe86848 MS |
467 | set_nlink(old_dentry->d_inode, |
468 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink); | |
237fead6 MH |
469 | i_size_write(new_dentry->d_inode, file_size_save); |
470 | out_lock: | |
471 | unlock_dir(lower_dir_dentry); | |
472 | dput(lower_new_dentry); | |
473 | dput(lower_old_dentry); | |
237fead6 MH |
474 | return rc; |
475 | } | |
476 | ||
477 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
478 | { | |
479 | int rc = 0; | |
480 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
481 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
8dc4e373 | 482 | struct dentry *lower_dir_dentry; |
237fead6 | 483 | |
9c2d2056 | 484 | dget(lower_dentry); |
8dc4e373 | 485 | lower_dir_dentry = lock_parent(lower_dentry); |
237fead6 MH |
486 | rc = vfs_unlink(lower_dir_inode, lower_dentry); |
487 | if (rc) { | |
ae56fb16 | 488 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
489 | goto out_unlock; |
490 | } | |
0cc72dc7 | 491 | fsstack_copy_attr_times(dir, lower_dir_inode); |
bfe86848 MS |
492 | set_nlink(dentry->d_inode, |
493 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink); | |
237fead6 | 494 | dentry->d_inode->i_ctime = dir->i_ctime; |
caeeeecf | 495 | d_drop(dentry); |
237fead6 | 496 | out_unlock: |
8dc4e373 | 497 | unlock_dir(lower_dir_dentry); |
9c2d2056 | 498 | dput(lower_dentry); |
237fead6 MH |
499 | return rc; |
500 | } | |
501 | ||
502 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
503 | const char *symname) | |
504 | { | |
505 | int rc; | |
506 | struct dentry *lower_dentry; | |
507 | struct dentry *lower_dir_dentry; | |
237fead6 | 508 | char *encoded_symname; |
addd65ad MH |
509 | size_t encoded_symlen; |
510 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
511 | |
512 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
513 | dget(lower_dentry); | |
514 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
515 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
516 | dir->i_sb)->mount_crypt_stat; | |
517 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
518 | &encoded_symlen, | |
519 | NULL, | |
520 | mount_crypt_stat, symname, | |
521 | strlen(symname)); | |
522 | if (rc) | |
237fead6 | 523 | goto out_lock; |
237fead6 | 524 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, |
db2e747b | 525 | encoded_symname); |
237fead6 MH |
526 | kfree(encoded_symname); |
527 | if (rc || !lower_dentry->d_inode) | |
528 | goto out_lock; | |
5ccf9203 | 529 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
530 | if (rc) |
531 | goto out_lock; | |
0cc72dc7 JJS |
532 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
533 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
534 | out_lock: |
535 | unlock_dir(lower_dir_dentry); | |
536 | dput(lower_dentry); | |
537 | if (!dentry->d_inode) | |
538 | d_drop(dentry); | |
539 | return rc; | |
540 | } | |
541 | ||
18bb1db3 | 542 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
237fead6 MH |
543 | { |
544 | int rc; | |
545 | struct dentry *lower_dentry; | |
546 | struct dentry *lower_dir_dentry; | |
547 | ||
548 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
549 | lower_dir_dentry = lock_parent(lower_dentry); | |
550 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
551 | if (rc || !lower_dentry->d_inode) | |
552 | goto out; | |
5ccf9203 | 553 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
554 | if (rc) |
555 | goto out; | |
0cc72dc7 JJS |
556 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
557 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
bfe86848 | 558 | set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); |
237fead6 MH |
559 | out: |
560 | unlock_dir(lower_dir_dentry); | |
561 | if (!dentry->d_inode) | |
562 | d_drop(dentry); | |
563 | return rc; | |
564 | } | |
565 | ||
566 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
567 | { | |
237fead6 | 568 | struct dentry *lower_dentry; |
237fead6 | 569 | struct dentry *lower_dir_dentry; |
45ec4aba | 570 | int rc; |
237fead6 MH |
571 | |
572 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 573 | dget(dentry); |
237fead6 | 574 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 575 | dget(lower_dentry); |
237fead6 | 576 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba | 577 | dput(lower_dentry); |
07850552 TH |
578 | if (!rc && dentry->d_inode) |
579 | clear_nlink(dentry->d_inode); | |
0cc72dc7 | 580 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
bfe86848 | 581 | set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); |
237fead6 MH |
582 | unlock_dir(lower_dir_dentry); |
583 | if (!rc) | |
584 | d_drop(dentry); | |
45ec4aba | 585 | dput(dentry); |
237fead6 MH |
586 | return rc; |
587 | } | |
588 | ||
589 | static int | |
1a67aafb | 590 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
237fead6 MH |
591 | { |
592 | int rc; | |
593 | struct dentry *lower_dentry; | |
594 | struct dentry *lower_dir_dentry; | |
595 | ||
596 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
597 | lower_dir_dentry = lock_parent(lower_dentry); | |
598 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
599 | if (rc || !lower_dentry->d_inode) | |
600 | goto out; | |
5ccf9203 | 601 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
602 | if (rc) |
603 | goto out; | |
0cc72dc7 JJS |
604 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
605 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
606 | out: |
607 | unlock_dir(lower_dir_dentry); | |
608 | if (!dentry->d_inode) | |
609 | d_drop(dentry); | |
610 | return rc; | |
611 | } | |
612 | ||
613 | static int | |
614 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
615 | struct inode *new_dir, struct dentry *new_dentry) | |
616 | { | |
617 | int rc; | |
618 | struct dentry *lower_old_dentry; | |
619 | struct dentry *lower_new_dentry; | |
620 | struct dentry *lower_old_dir_dentry; | |
621 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 622 | struct dentry *trap = NULL; |
237fead6 MH |
623 | |
624 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
625 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
626 | dget(lower_old_dentry); | |
627 | dget(lower_new_dentry); | |
628 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
629 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
0d132f73 EZ |
630 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
631 | /* source should not be ancestor of target */ | |
632 | if (trap == lower_old_dentry) { | |
633 | rc = -EINVAL; | |
634 | goto out_lock; | |
635 | } | |
636 | /* target should not be ancestor of source */ | |
637 | if (trap == lower_new_dentry) { | |
638 | rc = -ENOTEMPTY; | |
639 | goto out_lock; | |
640 | } | |
237fead6 MH |
641 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, |
642 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
643 | if (rc) | |
644 | goto out_lock; | |
9afa2fb6 | 645 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); |
237fead6 | 646 | if (new_dir != old_dir) |
9afa2fb6 | 647 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); |
237fead6 MH |
648 | out_lock: |
649 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
dd55c898 TH |
650 | dput(lower_new_dir_dentry); |
651 | dput(lower_old_dir_dentry); | |
237fead6 MH |
652 | dput(lower_new_dentry); |
653 | dput(lower_old_dentry); | |
654 | return rc; | |
655 | } | |
656 | ||
3a60a168 TH |
657 | static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, |
658 | size_t *bufsiz) | |
237fead6 | 659 | { |
3a60a168 | 660 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
237fead6 | 661 | char *lower_buf; |
addd65ad MH |
662 | mm_segment_t old_fs; |
663 | int rc; | |
237fead6 | 664 | |
408bd629 | 665 | lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); |
3a60a168 | 666 | if (!lower_buf) { |
237fead6 MH |
667 | rc = -ENOMEM; |
668 | goto out; | |
669 | } | |
670 | old_fs = get_fs(); | |
671 | set_fs(get_ds()); | |
237fead6 MH |
672 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, |
673 | (char __user *)lower_buf, | |
408bd629 | 674 | PATH_MAX); |
237fead6 | 675 | set_fs(old_fs); |
3a60a168 TH |
676 | if (rc < 0) |
677 | goto out; | |
3a60a168 | 678 | rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, |
408bd629 | 679 | lower_buf, rc); |
3a60a168 | 680 | out: |
237fead6 | 681 | kfree(lower_buf); |
3a60a168 TH |
682 | return rc; |
683 | } | |
684 | ||
408bd629 | 685 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) |
3a60a168 | 686 | { |
408bd629 AV |
687 | char *buf; |
688 | size_t len = PATH_MAX; | |
3a60a168 TH |
689 | int rc; |
690 | ||
408bd629 | 691 | rc = ecryptfs_readlink_lower(dentry, &buf, &len); |
3a60a168 TH |
692 | if (rc) |
693 | goto out; | |
3a60a168 TH |
694 | fsstack_copy_attr_atime(dentry->d_inode, |
695 | ecryptfs_dentry_to_lower(dentry)->d_inode); | |
408bd629 | 696 | buf[len] = '\0'; |
237fead6 | 697 | out: |
806892e9 OH |
698 | nd_set_link(nd, buf); |
699 | return NULL; | |
237fead6 MH |
700 | } |
701 | ||
702 | static void | |
703 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
704 | { | |
806892e9 OH |
705 | char *buf = nd_get_link(nd); |
706 | if (!IS_ERR(buf)) { | |
707 | /* Free the char* */ | |
708 | kfree(buf); | |
709 | } | |
237fead6 MH |
710 | } |
711 | ||
712 | /** | |
713 | * upper_size_to_lower_size | |
714 | * @crypt_stat: Crypt_stat associated with file | |
715 | * @upper_size: Size of the upper file | |
716 | * | |
cc11beff | 717 | * Calculate the required size of the lower file based on the |
237fead6 MH |
718 | * specified size of the upper file. This calculation is based on the |
719 | * number of headers in the underlying file and the extent size. | |
720 | * | |
721 | * Returns Calculated size of the lower file. | |
722 | */ | |
723 | static loff_t | |
724 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
725 | loff_t upper_size) | |
726 | { | |
727 | loff_t lower_size; | |
728 | ||
157f1071 | 729 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
730 | if (upper_size != 0) { |
731 | loff_t num_extents; | |
732 | ||
733 | num_extents = upper_size >> crypt_stat->extent_shift; | |
734 | if (upper_size & ~crypt_stat->extent_mask) | |
735 | num_extents++; | |
736 | lower_size += (num_extents * crypt_stat->extent_size); | |
737 | } | |
738 | return lower_size; | |
739 | } | |
740 | ||
741 | /** | |
5f3ef64f | 742 | * truncate_upper |
237fead6 | 743 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
744 | * @ia: Address of the ecryptfs inode's attributes |
745 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
746 | * |
747 | * Function to handle truncations modifying the size of the file. Note | |
748 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
749 | * writing strings of 0's out. When truncating, we truncate the upper |
750 | * inode and update the lower_ia according to the page index | |
751 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
752 | * the caller must use lower_ia in a call to notify_change() to perform | |
753 | * the truncation of the lower inode. | |
237fead6 MH |
754 | * |
755 | * Returns zero on success; non-zero otherwise | |
756 | */ | |
5f3ef64f TH |
757 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
758 | struct iattr *lower_ia) | |
237fead6 MH |
759 | { |
760 | int rc = 0; | |
761 | struct inode *inode = dentry->d_inode; | |
237fead6 MH |
762 | struct ecryptfs_crypt_stat *crypt_stat; |
763 | loff_t i_size = i_size_read(inode); | |
764 | loff_t lower_size_before_truncate; | |
765 | loff_t lower_size_after_truncate; | |
766 | ||
5f3ef64f TH |
767 | if (unlikely((ia->ia_size == i_size))) { |
768 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 769 | return 0; |
5f3ef64f | 770 | } |
3b06b3eb | 771 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
772 | if (rc) |
773 | return rc; | |
237fead6 | 774 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
237fead6 | 775 | /* Switch on growing or shrinking file */ |
5f3ef64f | 776 | if (ia->ia_size > i_size) { |
2ed92554 MH |
777 | char zero[] = { 0x00 }; |
778 | ||
5f3ef64f | 779 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
780 | /* Write a single 0 at the last position of the file; |
781 | * this triggers code that will fill in 0's throughout | |
782 | * the intermediate portion of the previous end of the | |
783 | * file and the new and of the file */ | |
48c1e44a | 784 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
785 | (ia->ia_size - 1), 1); |
786 | } else { /* ia->ia_size < i_size_read(inode) */ | |
787 | /* We're chopping off all the pages down to the page | |
788 | * in which ia->ia_size is located. Fill in the end of | |
789 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to | |
2ed92554 MH |
790 | * PAGE_CACHE_SIZE with zeros. */ |
791 | size_t num_zeros = (PAGE_CACHE_SIZE | |
5f3ef64f | 792 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
2ed92554 | 793 | |
13a791b4 | 794 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 795 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
796 | lower_ia->ia_size = ia->ia_size; |
797 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 798 | goto out; |
13a791b4 | 799 | } |
2ed92554 MH |
800 | if (num_zeros) { |
801 | char *zeros_virt; | |
802 | ||
803 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
804 | if (!zeros_virt) { | |
805 | rc = -ENOMEM; | |
48c1e44a | 806 | goto out; |
2ed92554 | 807 | } |
48c1e44a | 808 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 809 | ia->ia_size, num_zeros); |
2ed92554 | 810 | kfree(zeros_virt); |
5dda6992 | 811 | if (rc) { |
240e2df5 MH |
812 | printk(KERN_ERR "Error attempting to zero out " |
813 | "the remainder of the end page on " | |
814 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 815 | goto out; |
240e2df5 MH |
816 | } |
817 | } | |
2c27c65e | 818 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 819 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
820 | if (rc) { |
821 | printk(KERN_ERR "Problem with " | |
822 | "ecryptfs_write_inode_size_to_metadata; " | |
823 | "rc = [%d]\n", rc); | |
48c1e44a | 824 | goto out; |
dd2a3b7a | 825 | } |
237fead6 MH |
826 | /* We are reducing the size of the ecryptfs file, and need to |
827 | * know if we need to reduce the size of the lower file. */ | |
828 | lower_size_before_truncate = | |
829 | upper_size_to_lower_size(crypt_stat, i_size); | |
830 | lower_size_after_truncate = | |
5f3ef64f TH |
831 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
832 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
833 | lower_ia->ia_size = lower_size_after_truncate; | |
834 | lower_ia->ia_valid |= ATTR_SIZE; | |
835 | } else | |
836 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 837 | } |
237fead6 | 838 | out: |
332ab16f | 839 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
840 | return rc; |
841 | } | |
842 | ||
a261a039 TH |
843 | static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) |
844 | { | |
845 | struct ecryptfs_crypt_stat *crypt_stat; | |
846 | loff_t lower_oldsize, lower_newsize; | |
847 | ||
848 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
849 | lower_oldsize = upper_size_to_lower_size(crypt_stat, | |
850 | i_size_read(inode)); | |
851 | lower_newsize = upper_size_to_lower_size(crypt_stat, offset); | |
852 | if (lower_newsize > lower_oldsize) { | |
853 | /* | |
854 | * The eCryptfs inode and the new *lower* size are mixed here | |
855 | * because we may not have the lower i_mutex held and/or it may | |
856 | * not be appropriate to call inode_newsize_ok() with inodes | |
857 | * from other filesystems. | |
858 | */ | |
859 | return inode_newsize_ok(inode, lower_newsize); | |
860 | } | |
861 | ||
862 | return 0; | |
863 | } | |
864 | ||
5f3ef64f TH |
865 | /** |
866 | * ecryptfs_truncate | |
867 | * @dentry: The ecryptfs layer dentry | |
868 | * @new_length: The length to expand the file to | |
869 | * | |
870 | * Simple function that handles the truncation of an eCryptfs inode and | |
871 | * its corresponding lower inode. | |
872 | * | |
873 | * Returns zero on success; non-zero otherwise | |
874 | */ | |
875 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
876 | { | |
877 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
878 | struct iattr lower_ia = { .ia_valid = 0 }; | |
879 | int rc; | |
880 | ||
a261a039 TH |
881 | rc = ecryptfs_inode_newsize_ok(dentry->d_inode, new_length); |
882 | if (rc) | |
883 | return rc; | |
884 | ||
5f3ef64f TH |
885 | rc = truncate_upper(dentry, &ia, &lower_ia); |
886 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
887 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
888 | ||
889 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
890 | rc = notify_change(lower_dentry, &lower_ia); | |
891 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
892 | } | |
893 | return rc; | |
894 | } | |
895 | ||
237fead6 | 896 | static int |
10556cb2 | 897 | ecryptfs_permission(struct inode *inode, int mask) |
237fead6 | 898 | { |
f419a2e3 | 899 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
900 | } |
901 | ||
902 | /** | |
903 | * ecryptfs_setattr | |
904 | * @dentry: dentry handle to the inode to modify | |
905 | * @ia: Structure with flags of what to change and values | |
906 | * | |
907 | * Updates the metadata of an inode. If the update is to the size | |
908 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
909 | * of both the ecryptfs inode and the lower inode. | |
910 | * | |
911 | * All other metadata changes will be passed right to the lower filesystem, | |
912 | * and we will just update our inode to look like the lower. | |
913 | */ | |
914 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
915 | { | |
916 | int rc = 0; | |
917 | struct dentry *lower_dentry; | |
5f3ef64f | 918 | struct iattr lower_ia; |
237fead6 MH |
919 | struct inode *inode; |
920 | struct inode *lower_inode; | |
921 | struct ecryptfs_crypt_stat *crypt_stat; | |
922 | ||
923 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
924 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
925 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
926 | inode = dentry->d_inode; |
927 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
928 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
929 | mutex_lock(&crypt_stat->cs_mutex); | |
930 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
931 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
932 | else if (S_ISREG(dentry->d_inode->i_mode) |
933 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
934 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 935 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 936 | |
e10f281b MH |
937 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
938 | dentry->d_sb)->mount_crypt_stat; | |
3b06b3eb | 939 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
940 | if (rc) { |
941 | mutex_unlock(&crypt_stat->cs_mutex); | |
942 | goto out; | |
943 | } | |
d7cdc5fe | 944 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 945 | ecryptfs_put_lower_file(inode); |
5dda6992 | 946 | if (rc) { |
e10f281b MH |
947 | if (!(mount_crypt_stat->flags |
948 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
949 | rc = -EIO; | |
25bd8174 | 950 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 951 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
952 | "or the key could not be retrieved. " |
953 | "Plaintext passthrough mode is not " | |
e10f281b | 954 | "enabled; returning -EIO\n"); |
e10f281b | 955 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
956 | goto out; |
957 | } | |
958 | rc = 0; | |
3aeb86ea TH |
959 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
960 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 961 | } |
e10f281b MH |
962 | } |
963 | mutex_unlock(&crypt_stat->cs_mutex); | |
a261a039 TH |
964 | |
965 | rc = inode_change_ok(inode, ia); | |
966 | if (rc) | |
967 | goto out; | |
968 | if (ia->ia_valid & ATTR_SIZE) { | |
969 | rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); | |
970 | if (rc) | |
971 | goto out; | |
972 | } | |
973 | ||
5be79de2 TH |
974 | if (S_ISREG(inode->i_mode)) { |
975 | rc = filemap_write_and_wait(inode->i_mapping); | |
976 | if (rc) | |
977 | goto out; | |
978 | fsstack_copy_attr_all(inode, lower_inode); | |
979 | } | |
5f3ef64f TH |
980 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
981 | if (ia->ia_valid & ATTR_FILE) | |
982 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 983 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 984 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
985 | if (rc < 0) |
986 | goto out; | |
987 | } | |
1ac564ec JL |
988 | |
989 | /* | |
990 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
991 | * to interpret this in its own way. | |
992 | */ | |
5f3ef64f TH |
993 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
994 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 995 | |
9c3580aa | 996 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
5f3ef64f | 997 | rc = notify_change(lower_dentry, &lower_ia); |
9c3580aa | 998 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
237fead6 | 999 | out: |
9afa2fb6 | 1000 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
1001 | return rc; |
1002 | } | |
1003 | ||
3a60a168 TH |
1004 | int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
1005 | struct kstat *stat) | |
1006 | { | |
1007 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; | |
1008 | int rc = 0; | |
1009 | ||
1010 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
1011 | dentry->d_sb)->mount_crypt_stat; | |
1012 | generic_fillattr(dentry->d_inode, stat); | |
1013 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { | |
1014 | char *target; | |
1015 | size_t targetsiz; | |
1016 | ||
1017 | rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); | |
1018 | if (!rc) { | |
1019 | kfree(target); | |
1020 | stat->size = targetsiz; | |
1021 | } | |
1022 | } | |
1023 | return rc; | |
1024 | } | |
1025 | ||
f8f484d1 TH |
1026 | int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1027 | struct kstat *stat) | |
1028 | { | |
1029 | struct kstat lower_stat; | |
1030 | int rc; | |
1031 | ||
1032 | rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), | |
1033 | ecryptfs_dentry_to_lower(dentry), &lower_stat); | |
1034 | if (!rc) { | |
55f9cf6b TH |
1035 | fsstack_copy_attr_all(dentry->d_inode, |
1036 | ecryptfs_inode_to_lower(dentry->d_inode)); | |
f8f484d1 TH |
1037 | generic_fillattr(dentry->d_inode, stat); |
1038 | stat->blocks = lower_stat.blocks; | |
1039 | } | |
1040 | return rc; | |
1041 | } | |
1042 | ||
dd2a3b7a | 1043 | int |
237fead6 MH |
1044 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
1045 | size_t size, int flags) | |
1046 | { | |
1047 | int rc = 0; | |
1048 | struct dentry *lower_dentry; | |
1049 | ||
1050 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1051 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
cfce08c6 | 1052 | rc = -EOPNOTSUPP; |
237fead6 MH |
1053 | goto out; |
1054 | } | |
48b512e6 RS |
1055 | |
1056 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); | |
545d6809 TH |
1057 | if (!rc) |
1058 | fsstack_copy_attr_all(dentry->d_inode, lower_dentry->d_inode); | |
237fead6 MH |
1059 | out: |
1060 | return rc; | |
1061 | } | |
1062 | ||
d7cdc5fe MH |
1063 | ssize_t |
1064 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
1065 | void *value, size_t size) | |
1066 | { | |
1067 | int rc = 0; | |
1068 | ||
1069 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
cfce08c6 | 1070 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1071 | goto out; |
1072 | } | |
1073 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1074 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
1075 | size); | |
1076 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1077 | out: | |
1078 | return rc; | |
1079 | } | |
1080 | ||
7896b631 | 1081 | static ssize_t |
237fead6 MH |
1082 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
1083 | size_t size) | |
1084 | { | |
2ed92554 MH |
1085 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
1086 | value, size); | |
237fead6 MH |
1087 | } |
1088 | ||
1089 | static ssize_t | |
1090 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1091 | { | |
1092 | int rc = 0; | |
1093 | struct dentry *lower_dentry; | |
1094 | ||
1095 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1096 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
cfce08c6 | 1097 | rc = -EOPNOTSUPP; |
237fead6 MH |
1098 | goto out; |
1099 | } | |
1100 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1101 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
1102 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1103 | out: | |
1104 | return rc; | |
1105 | } | |
1106 | ||
1107 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
1108 | { | |
1109 | int rc = 0; | |
1110 | struct dentry *lower_dentry; | |
1111 | ||
1112 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1113 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
cfce08c6 | 1114 | rc = -EOPNOTSUPP; |
237fead6 MH |
1115 | goto out; |
1116 | } | |
1117 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1118 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
1119 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1120 | out: | |
1121 | return rc; | |
1122 | } | |
1123 | ||
754661f1 | 1124 | const struct inode_operations ecryptfs_symlink_iops = { |
408bd629 | 1125 | .readlink = generic_readlink, |
237fead6 MH |
1126 | .follow_link = ecryptfs_follow_link, |
1127 | .put_link = ecryptfs_put_link, | |
1128 | .permission = ecryptfs_permission, | |
1129 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1130 | .getattr = ecryptfs_getattr_link, |
237fead6 MH |
1131 | .setxattr = ecryptfs_setxattr, |
1132 | .getxattr = ecryptfs_getxattr, | |
1133 | .listxattr = ecryptfs_listxattr, | |
1134 | .removexattr = ecryptfs_removexattr | |
1135 | }; | |
1136 | ||
754661f1 | 1137 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1138 | .create = ecryptfs_create, |
1139 | .lookup = ecryptfs_lookup, | |
1140 | .link = ecryptfs_link, | |
1141 | .unlink = ecryptfs_unlink, | |
1142 | .symlink = ecryptfs_symlink, | |
1143 | .mkdir = ecryptfs_mkdir, | |
1144 | .rmdir = ecryptfs_rmdir, | |
1145 | .mknod = ecryptfs_mknod, | |
1146 | .rename = ecryptfs_rename, | |
1147 | .permission = ecryptfs_permission, | |
1148 | .setattr = ecryptfs_setattr, | |
1149 | .setxattr = ecryptfs_setxattr, | |
1150 | .getxattr = ecryptfs_getxattr, | |
1151 | .listxattr = ecryptfs_listxattr, | |
1152 | .removexattr = ecryptfs_removexattr | |
1153 | }; | |
1154 | ||
754661f1 | 1155 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1156 | .permission = ecryptfs_permission, |
1157 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1158 | .getattr = ecryptfs_getattr, |
237fead6 MH |
1159 | .setxattr = ecryptfs_setxattr, |
1160 | .getxattr = ecryptfs_getxattr, | |
1161 | .listxattr = ecryptfs_listxattr, | |
1162 | .removexattr = ecryptfs_removexattr | |
1163 | }; |