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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 | 384 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); |
8787c7a3 TH |
385 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
386 | lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, | |
387 | lower_dir_dentry, | |
388 | ecryptfs_dentry->d_name.len); | |
389 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
390 | if (IS_ERR(lower_dentry)) { |
391 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 392 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f | 393 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
bc65a121 AV |
394 | ecryptfs_dentry->d_name.name); |
395 | goto out; | |
addd65ad MH |
396 | } |
397 | if (lower_dentry->d_inode) | |
5ccf9203 | 398 | goto interpose; |
2aac0cf8 TH |
399 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
400 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
401 | if (!(mount_crypt_stat | |
402 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) | |
5ccf9203 | 403 | goto interpose; |
addd65ad MH |
404 | dput(lower_dentry); |
405 | rc = ecryptfs_encrypt_and_encode_filename( | |
406 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, | |
2aac0cf8 | 407 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
addd65ad MH |
408 | ecryptfs_dentry->d_name.len); |
409 | if (rc) { | |
410 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
411 | "filename; rc = [%d]\n", __func__, rc); | |
bc65a121 | 412 | goto out; |
addd65ad | 413 | } |
8787c7a3 TH |
414 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
415 | lower_dentry = lookup_one_len(encrypted_and_encoded_name, | |
416 | lower_dir_dentry, | |
417 | encrypted_and_encoded_name_size); | |
418 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
419 | if (IS_ERR(lower_dentry)) { |
420 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 421 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
422 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
423 | encrypted_and_encoded_name); | |
bc65a121 | 424 | goto out; |
addd65ad | 425 | } |
5ccf9203 TH |
426 | interpose: |
427 | rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, | |
428 | ecryptfs_dir_inode); | |
237fead6 | 429 | out: |
addd65ad | 430 | kfree(encrypted_and_encoded_name); |
237fead6 MH |
431 | return ERR_PTR(rc); |
432 | } | |
433 | ||
434 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
435 | struct dentry *new_dentry) | |
436 | { | |
437 | struct dentry *lower_old_dentry; | |
438 | struct dentry *lower_new_dentry; | |
439 | struct dentry *lower_dir_dentry; | |
440 | u64 file_size_save; | |
441 | int rc; | |
442 | ||
443 | file_size_save = i_size_read(old_dentry->d_inode); | |
444 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
445 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
446 | dget(lower_old_dentry); | |
447 | dget(lower_new_dentry); | |
448 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
449 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
450 | lower_new_dentry); | |
451 | if (rc || !lower_new_dentry->d_inode) | |
452 | goto out_lock; | |
5ccf9203 | 453 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
237fead6 MH |
454 | if (rc) |
455 | goto out_lock; | |
3a8380c0 TH |
456 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
457 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
bfe86848 MS |
458 | set_nlink(old_dentry->d_inode, |
459 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink); | |
237fead6 MH |
460 | i_size_write(new_dentry->d_inode, file_size_save); |
461 | out_lock: | |
462 | unlock_dir(lower_dir_dentry); | |
463 | dput(lower_new_dentry); | |
464 | dput(lower_old_dentry); | |
237fead6 MH |
465 | return rc; |
466 | } | |
467 | ||
468 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
469 | { | |
470 | int rc = 0; | |
471 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
472 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
8dc4e373 | 473 | struct dentry *lower_dir_dentry; |
237fead6 | 474 | |
9c2d2056 | 475 | dget(lower_dentry); |
8dc4e373 | 476 | lower_dir_dentry = lock_parent(lower_dentry); |
237fead6 MH |
477 | rc = vfs_unlink(lower_dir_inode, lower_dentry); |
478 | if (rc) { | |
ae56fb16 | 479 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
480 | goto out_unlock; |
481 | } | |
0cc72dc7 | 482 | fsstack_copy_attr_times(dir, lower_dir_inode); |
bfe86848 MS |
483 | set_nlink(dentry->d_inode, |
484 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink); | |
237fead6 | 485 | dentry->d_inode->i_ctime = dir->i_ctime; |
caeeeecf | 486 | d_drop(dentry); |
237fead6 | 487 | out_unlock: |
8dc4e373 | 488 | unlock_dir(lower_dir_dentry); |
9c2d2056 | 489 | dput(lower_dentry); |
237fead6 MH |
490 | return rc; |
491 | } | |
492 | ||
493 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
494 | const char *symname) | |
495 | { | |
496 | int rc; | |
497 | struct dentry *lower_dentry; | |
498 | struct dentry *lower_dir_dentry; | |
237fead6 | 499 | char *encoded_symname; |
addd65ad MH |
500 | size_t encoded_symlen; |
501 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
502 | |
503 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
504 | dget(lower_dentry); | |
505 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
506 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
507 | dir->i_sb)->mount_crypt_stat; | |
508 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
509 | &encoded_symlen, | |
510 | NULL, | |
511 | mount_crypt_stat, symname, | |
512 | strlen(symname)); | |
513 | if (rc) | |
237fead6 | 514 | goto out_lock; |
237fead6 | 515 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, |
db2e747b | 516 | encoded_symname); |
237fead6 MH |
517 | kfree(encoded_symname); |
518 | if (rc || !lower_dentry->d_inode) | |
519 | goto out_lock; | |
5ccf9203 | 520 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
521 | if (rc) |
522 | goto out_lock; | |
0cc72dc7 JJS |
523 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
524 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
525 | out_lock: |
526 | unlock_dir(lower_dir_dentry); | |
527 | dput(lower_dentry); | |
528 | if (!dentry->d_inode) | |
529 | d_drop(dentry); | |
530 | return rc; | |
531 | } | |
532 | ||
18bb1db3 | 533 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
237fead6 MH |
534 | { |
535 | int rc; | |
536 | struct dentry *lower_dentry; | |
537 | struct dentry *lower_dir_dentry; | |
538 | ||
539 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
540 | lower_dir_dentry = lock_parent(lower_dentry); | |
541 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
542 | if (rc || !lower_dentry->d_inode) | |
543 | goto out; | |
5ccf9203 | 544 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
545 | if (rc) |
546 | goto out; | |
0cc72dc7 JJS |
547 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
548 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
bfe86848 | 549 | set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); |
237fead6 MH |
550 | out: |
551 | unlock_dir(lower_dir_dentry); | |
552 | if (!dentry->d_inode) | |
553 | d_drop(dentry); | |
554 | return rc; | |
555 | } | |
556 | ||
557 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
558 | { | |
237fead6 | 559 | struct dentry *lower_dentry; |
237fead6 | 560 | struct dentry *lower_dir_dentry; |
45ec4aba | 561 | int rc; |
237fead6 MH |
562 | |
563 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 564 | dget(dentry); |
237fead6 | 565 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 566 | dget(lower_dentry); |
237fead6 | 567 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba | 568 | dput(lower_dentry); |
07850552 TH |
569 | if (!rc && dentry->d_inode) |
570 | clear_nlink(dentry->d_inode); | |
0cc72dc7 | 571 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
bfe86848 | 572 | set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); |
237fead6 MH |
573 | unlock_dir(lower_dir_dentry); |
574 | if (!rc) | |
575 | d_drop(dentry); | |
45ec4aba | 576 | dput(dentry); |
237fead6 MH |
577 | return rc; |
578 | } | |
579 | ||
580 | static int | |
1a67aafb | 581 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
237fead6 MH |
582 | { |
583 | int rc; | |
584 | struct dentry *lower_dentry; | |
585 | struct dentry *lower_dir_dentry; | |
586 | ||
587 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
588 | lower_dir_dentry = lock_parent(lower_dentry); | |
589 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
590 | if (rc || !lower_dentry->d_inode) | |
591 | goto out; | |
5ccf9203 | 592 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
593 | if (rc) |
594 | goto out; | |
0cc72dc7 JJS |
595 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
596 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
597 | out: |
598 | unlock_dir(lower_dir_dentry); | |
599 | if (!dentry->d_inode) | |
600 | d_drop(dentry); | |
601 | return rc; | |
602 | } | |
603 | ||
604 | static int | |
605 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
606 | struct inode *new_dir, struct dentry *new_dentry) | |
607 | { | |
608 | int rc; | |
609 | struct dentry *lower_old_dentry; | |
610 | struct dentry *lower_new_dentry; | |
611 | struct dentry *lower_old_dir_dentry; | |
612 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 613 | struct dentry *trap = NULL; |
237fead6 MH |
614 | |
615 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
616 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
617 | dget(lower_old_dentry); | |
618 | dget(lower_new_dentry); | |
619 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
620 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
0d132f73 EZ |
621 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
622 | /* source should not be ancestor of target */ | |
623 | if (trap == lower_old_dentry) { | |
624 | rc = -EINVAL; | |
625 | goto out_lock; | |
626 | } | |
627 | /* target should not be ancestor of source */ | |
628 | if (trap == lower_new_dentry) { | |
629 | rc = -ENOTEMPTY; | |
630 | goto out_lock; | |
631 | } | |
237fead6 MH |
632 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, |
633 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
634 | if (rc) | |
635 | goto out_lock; | |
9afa2fb6 | 636 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); |
237fead6 | 637 | if (new_dir != old_dir) |
9afa2fb6 | 638 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); |
237fead6 MH |
639 | out_lock: |
640 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
dd55c898 TH |
641 | dput(lower_new_dir_dentry); |
642 | dput(lower_old_dir_dentry); | |
237fead6 MH |
643 | dput(lower_new_dentry); |
644 | dput(lower_old_dentry); | |
645 | return rc; | |
646 | } | |
647 | ||
3a60a168 TH |
648 | static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, |
649 | size_t *bufsiz) | |
237fead6 | 650 | { |
3a60a168 | 651 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
237fead6 | 652 | char *lower_buf; |
addd65ad MH |
653 | mm_segment_t old_fs; |
654 | int rc; | |
237fead6 | 655 | |
408bd629 | 656 | lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); |
3a60a168 | 657 | if (!lower_buf) { |
237fead6 MH |
658 | rc = -ENOMEM; |
659 | goto out; | |
660 | } | |
661 | old_fs = get_fs(); | |
662 | set_fs(get_ds()); | |
237fead6 MH |
663 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, |
664 | (char __user *)lower_buf, | |
408bd629 | 665 | PATH_MAX); |
237fead6 | 666 | set_fs(old_fs); |
3a60a168 TH |
667 | if (rc < 0) |
668 | goto out; | |
3a60a168 | 669 | rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, |
408bd629 | 670 | lower_buf, rc); |
3a60a168 | 671 | out: |
237fead6 | 672 | kfree(lower_buf); |
3a60a168 TH |
673 | return rc; |
674 | } | |
675 | ||
408bd629 | 676 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) |
3a60a168 | 677 | { |
408bd629 AV |
678 | char *buf; |
679 | size_t len = PATH_MAX; | |
3a60a168 TH |
680 | int rc; |
681 | ||
408bd629 | 682 | rc = ecryptfs_readlink_lower(dentry, &buf, &len); |
3a60a168 TH |
683 | if (rc) |
684 | goto out; | |
3a60a168 TH |
685 | fsstack_copy_attr_atime(dentry->d_inode, |
686 | ecryptfs_dentry_to_lower(dentry)->d_inode); | |
408bd629 | 687 | buf[len] = '\0'; |
237fead6 | 688 | out: |
806892e9 OH |
689 | nd_set_link(nd, buf); |
690 | return NULL; | |
237fead6 MH |
691 | } |
692 | ||
693 | static void | |
694 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
695 | { | |
806892e9 OH |
696 | char *buf = nd_get_link(nd); |
697 | if (!IS_ERR(buf)) { | |
698 | /* Free the char* */ | |
699 | kfree(buf); | |
700 | } | |
237fead6 MH |
701 | } |
702 | ||
703 | /** | |
704 | * upper_size_to_lower_size | |
705 | * @crypt_stat: Crypt_stat associated with file | |
706 | * @upper_size: Size of the upper file | |
707 | * | |
cc11beff | 708 | * Calculate the required size of the lower file based on the |
237fead6 MH |
709 | * specified size of the upper file. This calculation is based on the |
710 | * number of headers in the underlying file and the extent size. | |
711 | * | |
712 | * Returns Calculated size of the lower file. | |
713 | */ | |
714 | static loff_t | |
715 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
716 | loff_t upper_size) | |
717 | { | |
718 | loff_t lower_size; | |
719 | ||
157f1071 | 720 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
721 | if (upper_size != 0) { |
722 | loff_t num_extents; | |
723 | ||
724 | num_extents = upper_size >> crypt_stat->extent_shift; | |
725 | if (upper_size & ~crypt_stat->extent_mask) | |
726 | num_extents++; | |
727 | lower_size += (num_extents * crypt_stat->extent_size); | |
728 | } | |
729 | return lower_size; | |
730 | } | |
731 | ||
732 | /** | |
5f3ef64f | 733 | * truncate_upper |
237fead6 | 734 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
735 | * @ia: Address of the ecryptfs inode's attributes |
736 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
737 | * |
738 | * Function to handle truncations modifying the size of the file. Note | |
739 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
740 | * writing strings of 0's out. When truncating, we truncate the upper |
741 | * inode and update the lower_ia according to the page index | |
742 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
743 | * the caller must use lower_ia in a call to notify_change() to perform | |
744 | * the truncation of the lower inode. | |
237fead6 MH |
745 | * |
746 | * Returns zero on success; non-zero otherwise | |
747 | */ | |
5f3ef64f TH |
748 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
749 | struct iattr *lower_ia) | |
237fead6 MH |
750 | { |
751 | int rc = 0; | |
752 | struct inode *inode = dentry->d_inode; | |
237fead6 MH |
753 | struct ecryptfs_crypt_stat *crypt_stat; |
754 | loff_t i_size = i_size_read(inode); | |
755 | loff_t lower_size_before_truncate; | |
756 | loff_t lower_size_after_truncate; | |
757 | ||
5f3ef64f TH |
758 | if (unlikely((ia->ia_size == i_size))) { |
759 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 760 | return 0; |
5f3ef64f | 761 | } |
3b06b3eb | 762 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
763 | if (rc) |
764 | return rc; | |
237fead6 | 765 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
237fead6 | 766 | /* Switch on growing or shrinking file */ |
5f3ef64f | 767 | if (ia->ia_size > i_size) { |
2ed92554 MH |
768 | char zero[] = { 0x00 }; |
769 | ||
5f3ef64f | 770 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
771 | /* Write a single 0 at the last position of the file; |
772 | * this triggers code that will fill in 0's throughout | |
773 | * the intermediate portion of the previous end of the | |
774 | * file and the new and of the file */ | |
48c1e44a | 775 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
776 | (ia->ia_size - 1), 1); |
777 | } else { /* ia->ia_size < i_size_read(inode) */ | |
778 | /* We're chopping off all the pages down to the page | |
779 | * in which ia->ia_size is located. Fill in the end of | |
780 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to | |
2ed92554 MH |
781 | * PAGE_CACHE_SIZE with zeros. */ |
782 | size_t num_zeros = (PAGE_CACHE_SIZE | |
5f3ef64f | 783 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
2ed92554 | 784 | |
13a791b4 | 785 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 786 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
787 | lower_ia->ia_size = ia->ia_size; |
788 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 789 | goto out; |
13a791b4 | 790 | } |
2ed92554 MH |
791 | if (num_zeros) { |
792 | char *zeros_virt; | |
793 | ||
794 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
795 | if (!zeros_virt) { | |
796 | rc = -ENOMEM; | |
48c1e44a | 797 | goto out; |
2ed92554 | 798 | } |
48c1e44a | 799 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 800 | ia->ia_size, num_zeros); |
2ed92554 | 801 | kfree(zeros_virt); |
5dda6992 | 802 | if (rc) { |
240e2df5 MH |
803 | printk(KERN_ERR "Error attempting to zero out " |
804 | "the remainder of the end page on " | |
805 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 806 | goto out; |
240e2df5 MH |
807 | } |
808 | } | |
2c27c65e | 809 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 810 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
811 | if (rc) { |
812 | printk(KERN_ERR "Problem with " | |
813 | "ecryptfs_write_inode_size_to_metadata; " | |
814 | "rc = [%d]\n", rc); | |
48c1e44a | 815 | goto out; |
dd2a3b7a | 816 | } |
237fead6 MH |
817 | /* We are reducing the size of the ecryptfs file, and need to |
818 | * know if we need to reduce the size of the lower file. */ | |
819 | lower_size_before_truncate = | |
820 | upper_size_to_lower_size(crypt_stat, i_size); | |
821 | lower_size_after_truncate = | |
5f3ef64f TH |
822 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
823 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
824 | lower_ia->ia_size = lower_size_after_truncate; | |
825 | lower_ia->ia_valid |= ATTR_SIZE; | |
826 | } else | |
827 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 828 | } |
237fead6 | 829 | out: |
332ab16f | 830 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
831 | return rc; |
832 | } | |
833 | ||
a261a039 TH |
834 | static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) |
835 | { | |
836 | struct ecryptfs_crypt_stat *crypt_stat; | |
837 | loff_t lower_oldsize, lower_newsize; | |
838 | ||
839 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
840 | lower_oldsize = upper_size_to_lower_size(crypt_stat, | |
841 | i_size_read(inode)); | |
842 | lower_newsize = upper_size_to_lower_size(crypt_stat, offset); | |
843 | if (lower_newsize > lower_oldsize) { | |
844 | /* | |
845 | * The eCryptfs inode and the new *lower* size are mixed here | |
846 | * because we may not have the lower i_mutex held and/or it may | |
847 | * not be appropriate to call inode_newsize_ok() with inodes | |
848 | * from other filesystems. | |
849 | */ | |
850 | return inode_newsize_ok(inode, lower_newsize); | |
851 | } | |
852 | ||
853 | return 0; | |
854 | } | |
855 | ||
5f3ef64f TH |
856 | /** |
857 | * ecryptfs_truncate | |
858 | * @dentry: The ecryptfs layer dentry | |
859 | * @new_length: The length to expand the file to | |
860 | * | |
861 | * Simple function that handles the truncation of an eCryptfs inode and | |
862 | * its corresponding lower inode. | |
863 | * | |
864 | * Returns zero on success; non-zero otherwise | |
865 | */ | |
866 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
867 | { | |
868 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
869 | struct iattr lower_ia = { .ia_valid = 0 }; | |
870 | int rc; | |
871 | ||
a261a039 TH |
872 | rc = ecryptfs_inode_newsize_ok(dentry->d_inode, new_length); |
873 | if (rc) | |
874 | return rc; | |
875 | ||
5f3ef64f TH |
876 | rc = truncate_upper(dentry, &ia, &lower_ia); |
877 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
878 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
879 | ||
880 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
881 | rc = notify_change(lower_dentry, &lower_ia); | |
882 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
883 | } | |
884 | return rc; | |
885 | } | |
886 | ||
237fead6 | 887 | static int |
10556cb2 | 888 | ecryptfs_permission(struct inode *inode, int mask) |
237fead6 | 889 | { |
f419a2e3 | 890 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
891 | } |
892 | ||
893 | /** | |
894 | * ecryptfs_setattr | |
895 | * @dentry: dentry handle to the inode to modify | |
896 | * @ia: Structure with flags of what to change and values | |
897 | * | |
898 | * Updates the metadata of an inode. If the update is to the size | |
899 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
900 | * of both the ecryptfs inode and the lower inode. | |
901 | * | |
902 | * All other metadata changes will be passed right to the lower filesystem, | |
903 | * and we will just update our inode to look like the lower. | |
904 | */ | |
905 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
906 | { | |
907 | int rc = 0; | |
908 | struct dentry *lower_dentry; | |
5f3ef64f | 909 | struct iattr lower_ia; |
237fead6 MH |
910 | struct inode *inode; |
911 | struct inode *lower_inode; | |
912 | struct ecryptfs_crypt_stat *crypt_stat; | |
913 | ||
914 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
915 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
916 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
917 | inode = dentry->d_inode; |
918 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
919 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
920 | mutex_lock(&crypt_stat->cs_mutex); | |
921 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
922 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
923 | else if (S_ISREG(dentry->d_inode->i_mode) |
924 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
925 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 926 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 927 | |
e10f281b MH |
928 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
929 | dentry->d_sb)->mount_crypt_stat; | |
3b06b3eb | 930 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
931 | if (rc) { |
932 | mutex_unlock(&crypt_stat->cs_mutex); | |
933 | goto out; | |
934 | } | |
d7cdc5fe | 935 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 936 | ecryptfs_put_lower_file(inode); |
5dda6992 | 937 | if (rc) { |
e10f281b MH |
938 | if (!(mount_crypt_stat->flags |
939 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
940 | rc = -EIO; | |
25bd8174 | 941 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 942 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
943 | "or the key could not be retrieved. " |
944 | "Plaintext passthrough mode is not " | |
e10f281b | 945 | "enabled; returning -EIO\n"); |
e10f281b | 946 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
947 | goto out; |
948 | } | |
949 | rc = 0; | |
3aeb86ea TH |
950 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
951 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 952 | } |
e10f281b MH |
953 | } |
954 | mutex_unlock(&crypt_stat->cs_mutex); | |
a261a039 TH |
955 | |
956 | rc = inode_change_ok(inode, ia); | |
957 | if (rc) | |
958 | goto out; | |
959 | if (ia->ia_valid & ATTR_SIZE) { | |
960 | rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); | |
961 | if (rc) | |
962 | goto out; | |
963 | } | |
964 | ||
5be79de2 TH |
965 | if (S_ISREG(inode->i_mode)) { |
966 | rc = filemap_write_and_wait(inode->i_mapping); | |
967 | if (rc) | |
968 | goto out; | |
969 | fsstack_copy_attr_all(inode, lower_inode); | |
970 | } | |
5f3ef64f TH |
971 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
972 | if (ia->ia_valid & ATTR_FILE) | |
973 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 974 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 975 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
976 | if (rc < 0) |
977 | goto out; | |
978 | } | |
1ac564ec JL |
979 | |
980 | /* | |
981 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
982 | * to interpret this in its own way. | |
983 | */ | |
5f3ef64f TH |
984 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
985 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 986 | |
9c3580aa | 987 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
5f3ef64f | 988 | rc = notify_change(lower_dentry, &lower_ia); |
9c3580aa | 989 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
237fead6 | 990 | out: |
9afa2fb6 | 991 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
992 | return rc; |
993 | } | |
994 | ||
3a60a168 TH |
995 | int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
996 | struct kstat *stat) | |
997 | { | |
998 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; | |
999 | int rc = 0; | |
1000 | ||
1001 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
1002 | dentry->d_sb)->mount_crypt_stat; | |
1003 | generic_fillattr(dentry->d_inode, stat); | |
1004 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { | |
1005 | char *target; | |
1006 | size_t targetsiz; | |
1007 | ||
1008 | rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); | |
1009 | if (!rc) { | |
1010 | kfree(target); | |
1011 | stat->size = targetsiz; | |
1012 | } | |
1013 | } | |
1014 | return rc; | |
1015 | } | |
1016 | ||
f8f484d1 TH |
1017 | int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1018 | struct kstat *stat) | |
1019 | { | |
1020 | struct kstat lower_stat; | |
1021 | int rc; | |
1022 | ||
1023 | rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), | |
1024 | ecryptfs_dentry_to_lower(dentry), &lower_stat); | |
1025 | if (!rc) { | |
55f9cf6b TH |
1026 | fsstack_copy_attr_all(dentry->d_inode, |
1027 | ecryptfs_inode_to_lower(dentry->d_inode)); | |
f8f484d1 TH |
1028 | generic_fillattr(dentry->d_inode, stat); |
1029 | stat->blocks = lower_stat.blocks; | |
1030 | } | |
1031 | return rc; | |
1032 | } | |
1033 | ||
dd2a3b7a | 1034 | int |
237fead6 MH |
1035 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
1036 | size_t size, int flags) | |
1037 | { | |
1038 | int rc = 0; | |
1039 | struct dentry *lower_dentry; | |
1040 | ||
1041 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1042 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
cfce08c6 | 1043 | rc = -EOPNOTSUPP; |
237fead6 MH |
1044 | goto out; |
1045 | } | |
48b512e6 RS |
1046 | |
1047 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); | |
545d6809 TH |
1048 | if (!rc) |
1049 | fsstack_copy_attr_all(dentry->d_inode, lower_dentry->d_inode); | |
237fead6 MH |
1050 | out: |
1051 | return rc; | |
1052 | } | |
1053 | ||
d7cdc5fe MH |
1054 | ssize_t |
1055 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
1056 | void *value, size_t size) | |
1057 | { | |
1058 | int rc = 0; | |
1059 | ||
1060 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
cfce08c6 | 1061 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1062 | goto out; |
1063 | } | |
1064 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1065 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
1066 | size); | |
1067 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1068 | out: | |
1069 | return rc; | |
1070 | } | |
1071 | ||
7896b631 | 1072 | static ssize_t |
237fead6 MH |
1073 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
1074 | size_t size) | |
1075 | { | |
2ed92554 MH |
1076 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
1077 | value, size); | |
237fead6 MH |
1078 | } |
1079 | ||
1080 | static ssize_t | |
1081 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1082 | { | |
1083 | int rc = 0; | |
1084 | struct dentry *lower_dentry; | |
1085 | ||
1086 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1087 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
cfce08c6 | 1088 | rc = -EOPNOTSUPP; |
237fead6 MH |
1089 | goto out; |
1090 | } | |
1091 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1092 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
1093 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1094 | out: | |
1095 | return rc; | |
1096 | } | |
1097 | ||
1098 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
1099 | { | |
1100 | int rc = 0; | |
1101 | struct dentry *lower_dentry; | |
1102 | ||
1103 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1104 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
cfce08c6 | 1105 | rc = -EOPNOTSUPP; |
237fead6 MH |
1106 | goto out; |
1107 | } | |
1108 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1109 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
1110 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1111 | out: | |
1112 | return rc; | |
1113 | } | |
1114 | ||
754661f1 | 1115 | const struct inode_operations ecryptfs_symlink_iops = { |
408bd629 | 1116 | .readlink = generic_readlink, |
237fead6 MH |
1117 | .follow_link = ecryptfs_follow_link, |
1118 | .put_link = ecryptfs_put_link, | |
1119 | .permission = ecryptfs_permission, | |
1120 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1121 | .getattr = ecryptfs_getattr_link, |
237fead6 MH |
1122 | .setxattr = ecryptfs_setxattr, |
1123 | .getxattr = ecryptfs_getxattr, | |
1124 | .listxattr = ecryptfs_listxattr, | |
1125 | .removexattr = ecryptfs_removexattr | |
1126 | }; | |
1127 | ||
754661f1 | 1128 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1129 | .create = ecryptfs_create, |
1130 | .lookup = ecryptfs_lookup, | |
1131 | .link = ecryptfs_link, | |
1132 | .unlink = ecryptfs_unlink, | |
1133 | .symlink = ecryptfs_symlink, | |
1134 | .mkdir = ecryptfs_mkdir, | |
1135 | .rmdir = ecryptfs_rmdir, | |
1136 | .mknod = ecryptfs_mknod, | |
1137 | .rename = ecryptfs_rename, | |
1138 | .permission = ecryptfs_permission, | |
1139 | .setattr = ecryptfs_setattr, | |
1140 | .setxattr = ecryptfs_setxattr, | |
1141 | .getxattr = ecryptfs_getxattr, | |
1142 | .listxattr = ecryptfs_listxattr, | |
1143 | .removexattr = ecryptfs_removexattr | |
1144 | }; | |
1145 | ||
754661f1 | 1146 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1147 | .permission = ecryptfs_permission, |
1148 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1149 | .getattr = ecryptfs_getattr, |
237fead6 MH |
1150 | .setxattr = ecryptfs_setxattr, |
1151 | .getxattr = ecryptfs_getxattr, | |
1152 | .listxattr = ecryptfs_listxattr, | |
1153 | .removexattr = ecryptfs_removexattr | |
1154 | }; |