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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 | { | |
c4cf3ba4 | 56 | return ecryptfs_inode_to_lower(inode) == lower_inode; |
c4f79073 TH |
57 | } |
58 | ||
5ccf9203 | 59 | static int ecryptfs_inode_set(struct inode *inode, void *opaque) |
c4f79073 | 60 | { |
5ccf9203 TH |
61 | struct inode *lower_inode = opaque; |
62 | ||
63 | ecryptfs_set_inode_lower(inode, lower_inode); | |
64 | fsstack_copy_attr_all(inode, lower_inode); | |
65 | /* i_size will be overwritten for encrypted regular files */ | |
66 | fsstack_copy_inode_size(inode, lower_inode); | |
67 | inode->i_ino = lower_inode->i_ino; | |
c4f79073 | 68 | inode->i_version++; |
c4f79073 | 69 | inode->i_mapping->a_ops = &ecryptfs_aops; |
985ca0e6 | 70 | inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi; |
5ccf9203 TH |
71 | |
72 | if (S_ISLNK(inode->i_mode)) | |
73 | inode->i_op = &ecryptfs_symlink_iops; | |
74 | else if (S_ISDIR(inode->i_mode)) | |
75 | inode->i_op = &ecryptfs_dir_iops; | |
76 | else | |
77 | inode->i_op = &ecryptfs_main_iops; | |
78 | ||
79 | if (S_ISDIR(inode->i_mode)) | |
80 | inode->i_fop = &ecryptfs_dir_fops; | |
81 | else if (special_file(inode->i_mode)) | |
82 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
83 | else | |
84 | inode->i_fop = &ecryptfs_main_fops; | |
85 | ||
c4f79073 TH |
86 | return 0; |
87 | } | |
88 | ||
5ccf9203 TH |
89 | static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, |
90 | struct super_block *sb) | |
c4f79073 TH |
91 | { |
92 | struct inode *inode; | |
c4f79073 | 93 | |
5ccf9203 TH |
94 | if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) |
95 | return ERR_PTR(-EXDEV); | |
96 | if (!igrab(lower_inode)) | |
97 | return ERR_PTR(-ESTALE); | |
c4f79073 TH |
98 | inode = iget5_locked(sb, (unsigned long)lower_inode, |
99 | ecryptfs_inode_test, ecryptfs_inode_set, | |
100 | lower_inode); | |
101 | if (!inode) { | |
c4f79073 | 102 | iput(lower_inode); |
5ccf9203 | 103 | return ERR_PTR(-EACCES); |
c4f79073 | 104 | } |
5ccf9203 | 105 | if (!(inode->i_state & I_NEW)) |
c4f79073 | 106 | iput(lower_inode); |
5ccf9203 TH |
107 | |
108 | return inode; | |
109 | } | |
110 | ||
111 | struct inode *ecryptfs_get_inode(struct inode *lower_inode, | |
112 | struct super_block *sb) | |
113 | { | |
114 | struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); | |
115 | ||
116 | if (!IS_ERR(inode) && (inode->i_state & I_NEW)) | |
117 | unlock_new_inode(inode); | |
118 | ||
c4f79073 | 119 | return inode; |
c4f79073 TH |
120 | } |
121 | ||
c4f79073 TH |
122 | /** |
123 | * ecryptfs_interpose | |
124 | * @lower_dentry: Existing dentry in the lower filesystem | |
125 | * @dentry: ecryptfs' dentry | |
126 | * @sb: ecryptfs's super_block | |
c4f79073 TH |
127 | * |
128 | * Interposes upper and lower dentries. | |
129 | * | |
130 | * Returns zero on success; non-zero otherwise | |
131 | */ | |
132 | static int ecryptfs_interpose(struct dentry *lower_dentry, | |
5ccf9203 | 133 | struct dentry *dentry, struct super_block *sb) |
c4f79073 | 134 | { |
5ccf9203 TH |
135 | struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb); |
136 | ||
c4f79073 TH |
137 | if (IS_ERR(inode)) |
138 | return PTR_ERR(inode); | |
5ccf9203 TH |
139 | d_instantiate(dentry, inode); |
140 | ||
c4f79073 TH |
141 | return 0; |
142 | } | |
143 | ||
8bc2d3cf TH |
144 | static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, |
145 | struct inode *inode) | |
146 | { | |
147 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
148 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
149 | struct dentry *lower_dir_dentry; | |
150 | int rc; | |
151 | ||
152 | dget(lower_dentry); | |
153 | lower_dir_dentry = lock_parent(lower_dentry); | |
b21996e3 | 154 | rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); |
8bc2d3cf TH |
155 | if (rc) { |
156 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); | |
157 | goto out_unlock; | |
158 | } | |
159 | fsstack_copy_attr_times(dir, lower_dir_inode); | |
160 | set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); | |
161 | inode->i_ctime = dir->i_ctime; | |
162 | d_drop(dentry); | |
163 | out_unlock: | |
164 | unlock_dir(lower_dir_dentry); | |
165 | dput(lower_dentry); | |
166 | return rc; | |
167 | } | |
168 | ||
237fead6 MH |
169 | /** |
170 | * ecryptfs_do_create | |
171 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
172 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
173 | * @mode: The mode of the new file | |
174 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
175 | * | |
176 | * Creates the underlying file and the eCryptfs inode which will link to | |
177 | * it. It will also update the eCryptfs directory inode to mimic the | |
178 | * stat of the lower directory inode. | |
179 | * | |
b59db43a | 180 | * Returns the new eCryptfs inode on success; an ERR_PTR on error condition |
237fead6 | 181 | */ |
b59db43a | 182 | static struct inode * |
237fead6 | 183 | ecryptfs_do_create(struct inode *directory_inode, |
175a4eb7 | 184 | struct dentry *ecryptfs_dentry, umode_t mode) |
237fead6 MH |
185 | { |
186 | int rc; | |
187 | struct dentry *lower_dentry; | |
188 | struct dentry *lower_dir_dentry; | |
b59db43a | 189 | struct inode *inode; |
237fead6 MH |
190 | |
191 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
192 | lower_dir_dentry = lock_parent(lower_dentry); | |
312b63fb | 193 | rc = vfs_create(lower_dir_dentry->d_inode, lower_dentry, mode, true); |
4981e081 | 194 | if (rc) { |
caeeeecf | 195 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 196 | "rc = [%d]\n", __func__, rc); |
b59db43a | 197 | inode = ERR_PTR(rc); |
caeeeecf | 198 | goto out_lock; |
237fead6 | 199 | } |
b59db43a TH |
200 | inode = __ecryptfs_get_inode(lower_dentry->d_inode, |
201 | directory_inode->i_sb); | |
8bc2d3cf | 202 | if (IS_ERR(inode)) { |
b21996e3 | 203 | vfs_unlink(lower_dir_dentry->d_inode, lower_dentry, NULL); |
237fead6 | 204 | goto out_lock; |
8bc2d3cf | 205 | } |
0cc72dc7 JJS |
206 | fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); |
207 | fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); | |
237fead6 MH |
208 | out_lock: |
209 | unlock_dir(lower_dir_dentry); | |
b59db43a | 210 | return inode; |
237fead6 MH |
211 | } |
212 | ||
237fead6 MH |
213 | /** |
214 | * ecryptfs_initialize_file | |
215 | * | |
216 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
217 | * file with a header and first data page. | |
218 | * | |
219 | * Returns zero on success | |
220 | */ | |
e3ccaa97 TH |
221 | int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, |
222 | struct inode *ecryptfs_inode) | |
237fead6 | 223 | { |
d7cdc5fe | 224 | struct ecryptfs_crypt_stat *crypt_stat = |
b59db43a | 225 | &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; |
237fead6 | 226 | int rc = 0; |
237fead6 | 227 | |
b59db43a | 228 | if (S_ISDIR(ecryptfs_inode->i_mode)) { |
237fead6 | 229 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); |
e2bd99ec | 230 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 231 | goto out; |
237fead6 | 232 | } |
237fead6 | 233 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
b59db43a | 234 | rc = ecryptfs_new_file_context(ecryptfs_inode); |
237fead6 | 235 | if (rc) { |
d7cdc5fe MH |
236 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
237 | "context; rc = [%d]\n", rc); | |
238 | goto out; | |
237fead6 | 239 | } |
b59db43a | 240 | rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); |
27992890 RS |
241 | if (rc) { |
242 | printk(KERN_ERR "%s: Error attempting to initialize " | |
332ab16f | 243 | "the lower file for the dentry with name " |
9e78d14a DH |
244 | "[%pd]; rc = [%d]\n", __func__, |
245 | ecryptfs_dentry, rc); | |
27992890 | 246 | goto out; |
391b52f9 | 247 | } |
b59db43a | 248 | rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); |
332ab16f | 249 | if (rc) |
d7cdc5fe | 250 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
b59db43a | 251 | ecryptfs_put_lower_file(ecryptfs_inode); |
237fead6 MH |
252 | out: |
253 | return rc; | |
254 | } | |
255 | ||
256 | /** | |
257 | * ecryptfs_create | |
258 | * @dir: The inode of the directory in which to create the file. | |
259 | * @dentry: The eCryptfs dentry | |
260 | * @mode: The mode of the new file. | |
237fead6 MH |
261 | * |
262 | * Creates a new file. | |
263 | * | |
264 | * Returns zero on success; non-zero on error condition | |
265 | */ | |
266 | static int | |
267 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
ebfc3b49 | 268 | umode_t mode, bool excl) |
237fead6 | 269 | { |
b59db43a | 270 | struct inode *ecryptfs_inode; |
237fead6 MH |
271 | int rc; |
272 | ||
b59db43a TH |
273 | ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, |
274 | mode); | |
275 | if (unlikely(IS_ERR(ecryptfs_inode))) { | |
237fead6 MH |
276 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
277 | "lower filesystem\n"); | |
b59db43a | 278 | rc = PTR_ERR(ecryptfs_inode); |
237fead6 MH |
279 | goto out; |
280 | } | |
281 | /* At this point, a file exists on "disk"; we need to make sure | |
282 | * that this on disk file is prepared to be an ecryptfs file */ | |
b59db43a TH |
283 | rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); |
284 | if (rc) { | |
8bc2d3cf TH |
285 | ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, |
286 | ecryptfs_inode); | |
287 | make_bad_inode(ecryptfs_inode); | |
b59db43a TH |
288 | unlock_new_inode(ecryptfs_inode); |
289 | iput(ecryptfs_inode); | |
290 | goto out; | |
291 | } | |
b59db43a | 292 | unlock_new_inode(ecryptfs_inode); |
8fc37ec5 | 293 | d_instantiate(ecryptfs_dentry, ecryptfs_inode); |
237fead6 MH |
294 | out: |
295 | return rc; | |
296 | } | |
297 | ||
778aeb42 TH |
298 | static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) |
299 | { | |
300 | struct ecryptfs_crypt_stat *crypt_stat; | |
301 | int rc; | |
302 | ||
303 | rc = ecryptfs_get_lower_file(dentry, inode); | |
304 | if (rc) { | |
305 | printk(KERN_ERR "%s: Error attempting to initialize " | |
306 | "the lower file for the dentry with name " | |
9e78d14a DH |
307 | "[%pd]; rc = [%d]\n", __func__, |
308 | dentry, rc); | |
778aeb42 TH |
309 | return rc; |
310 | } | |
311 | ||
312 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
313 | /* TODO: lock for crypt_stat comparison */ | |
314 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
315 | ecryptfs_set_default_sizes(crypt_stat); | |
316 | ||
317 | rc = ecryptfs_read_and_validate_header_region(inode); | |
318 | ecryptfs_put_lower_file(inode); | |
319 | if (rc) { | |
320 | rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); | |
321 | if (!rc) | |
322 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; | |
323 | } | |
324 | ||
325 | /* Must return 0 to allow non-eCryptfs files to be looked up, too */ | |
326 | return 0; | |
327 | } | |
328 | ||
237fead6 | 329 | /** |
5ccf9203 | 330 | * ecryptfs_lookup_interpose - Dentry interposition for a lookup |
237fead6 | 331 | */ |
778aeb42 | 332 | static int ecryptfs_lookup_interpose(struct dentry *dentry, |
5ccf9203 | 333 | struct dentry *lower_dentry, |
778aeb42 | 334 | struct inode *dir_inode) |
237fead6 | 335 | { |
778aeb42 TH |
336 | struct inode *inode, *lower_inode = lower_dentry->d_inode; |
337 | struct ecryptfs_dentry_info *dentry_info; | |
237fead6 | 338 | struct vfsmount *lower_mnt; |
778aeb42 TH |
339 | int rc = 0; |
340 | ||
778aeb42 | 341 | dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); |
778aeb42 | 342 | if (!dentry_info) { |
addd65ad MH |
343 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
344 | "to allocate ecryptfs_dentry_info struct\n", | |
345 | __func__); | |
778aeb42 | 346 | dput(lower_dentry); |
778aeb42 | 347 | return -ENOMEM; |
237fead6 | 348 | } |
0b1d9011 AV |
349 | |
350 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); | |
351 | fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode); | |
84d08fa8 | 352 | BUG_ON(!d_count(lower_dentry)); |
0b1d9011 AV |
353 | |
354 | ecryptfs_set_dentry_private(dentry, dentry_info); | |
92dd1230 AV |
355 | dentry_info->lower_path.mnt = lower_mnt; |
356 | dentry_info->lower_path.dentry = lower_dentry; | |
778aeb42 | 357 | |
237fead6 MH |
358 | if (!lower_dentry->d_inode) { |
359 | /* We want to add because we couldn't find in lower */ | |
778aeb42 TH |
360 | d_add(dentry, NULL); |
361 | return 0; | |
237fead6 | 362 | } |
778aeb42 | 363 | inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); |
5ccf9203 | 364 | if (IS_ERR(inode)) { |
778aeb42 TH |
365 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", |
366 | __func__, PTR_ERR(inode)); | |
367 | return PTR_ERR(inode); | |
391b52f9 | 368 | } |
778aeb42 TH |
369 | if (S_ISREG(inode->i_mode)) { |
370 | rc = ecryptfs_i_size_read(dentry, inode); | |
dd2a3b7a | 371 | if (rc) { |
778aeb42 TH |
372 | make_bad_inode(inode); |
373 | return rc; | |
237fead6 | 374 | } |
237fead6 | 375 | } |
778aeb42 | 376 | |
3b06b3eb TH |
377 | if (inode->i_state & I_NEW) |
378 | unlock_new_inode(inode); | |
778aeb42 TH |
379 | d_add(dentry, inode); |
380 | ||
addd65ad MH |
381 | return rc; |
382 | } | |
383 | ||
384 | /** | |
385 | * ecryptfs_lookup | |
386 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
387 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
388 | * @ecryptfs_nd: nameidata; may be NULL | |
389 | * | |
390 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
391 | * dentry cache and continue on to read it from the disk. | |
392 | */ | |
393 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
394 | struct dentry *ecryptfs_dentry, | |
00cd8dd3 | 395 | unsigned int flags) |
addd65ad MH |
396 | { |
397 | char *encrypted_and_encoded_name = NULL; | |
a8f12864 | 398 | size_t encrypted_and_encoded_name_size; |
addd65ad | 399 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
addd65ad MH |
400 | struct dentry *lower_dir_dentry, *lower_dentry; |
401 | int rc = 0; | |
402 | ||
addd65ad | 403 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); |
8787c7a3 TH |
404 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
405 | lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, | |
406 | lower_dir_dentry, | |
407 | ecryptfs_dentry->d_name.len); | |
408 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
409 | if (IS_ERR(lower_dentry)) { |
410 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 411 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9e78d14a DH |
412 | "[%d] on lower_dentry = [%pd]\n", __func__, rc, |
413 | ecryptfs_dentry); | |
bc65a121 | 414 | goto out; |
addd65ad MH |
415 | } |
416 | if (lower_dentry->d_inode) | |
5ccf9203 | 417 | goto interpose; |
2aac0cf8 TH |
418 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
419 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
420 | if (!(mount_crypt_stat | |
421 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) | |
5ccf9203 | 422 | goto interpose; |
addd65ad MH |
423 | dput(lower_dentry); |
424 | rc = ecryptfs_encrypt_and_encode_filename( | |
425 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, | |
2aac0cf8 | 426 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
addd65ad MH |
427 | ecryptfs_dentry->d_name.len); |
428 | if (rc) { | |
429 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
430 | "filename; rc = [%d]\n", __func__, rc); | |
bc65a121 | 431 | goto out; |
addd65ad | 432 | } |
8787c7a3 TH |
433 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
434 | lower_dentry = lookup_one_len(encrypted_and_encoded_name, | |
435 | lower_dir_dentry, | |
436 | encrypted_and_encoded_name_size); | |
437 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
438 | if (IS_ERR(lower_dentry)) { |
439 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 440 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
441 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
442 | encrypted_and_encoded_name); | |
bc65a121 | 443 | goto out; |
addd65ad | 444 | } |
5ccf9203 TH |
445 | interpose: |
446 | rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, | |
447 | ecryptfs_dir_inode); | |
237fead6 | 448 | out: |
addd65ad | 449 | kfree(encrypted_and_encoded_name); |
237fead6 MH |
450 | return ERR_PTR(rc); |
451 | } | |
452 | ||
453 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
454 | struct dentry *new_dentry) | |
455 | { | |
456 | struct dentry *lower_old_dentry; | |
457 | struct dentry *lower_new_dentry; | |
458 | struct dentry *lower_dir_dentry; | |
459 | u64 file_size_save; | |
460 | int rc; | |
461 | ||
462 | file_size_save = i_size_read(old_dentry->d_inode); | |
463 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
464 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
465 | dget(lower_old_dentry); | |
466 | dget(lower_new_dentry); | |
467 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
468 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
146a8595 | 469 | lower_new_dentry, NULL); |
237fead6 MH |
470 | if (rc || !lower_new_dentry->d_inode) |
471 | goto out_lock; | |
5ccf9203 | 472 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
237fead6 MH |
473 | if (rc) |
474 | goto out_lock; | |
3a8380c0 TH |
475 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
476 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
bfe86848 MS |
477 | set_nlink(old_dentry->d_inode, |
478 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink); | |
237fead6 MH |
479 | i_size_write(new_dentry->d_inode, file_size_save); |
480 | out_lock: | |
481 | unlock_dir(lower_dir_dentry); | |
482 | dput(lower_new_dentry); | |
483 | dput(lower_old_dentry); | |
237fead6 MH |
484 | return rc; |
485 | } | |
486 | ||
487 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
488 | { | |
8bc2d3cf | 489 | return ecryptfs_do_unlink(dir, dentry, dentry->d_inode); |
237fead6 MH |
490 | } |
491 | ||
492 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
493 | const char *symname) | |
494 | { | |
495 | int rc; | |
496 | struct dentry *lower_dentry; | |
497 | struct dentry *lower_dir_dentry; | |
237fead6 | 498 | char *encoded_symname; |
addd65ad MH |
499 | size_t encoded_symlen; |
500 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
501 | |
502 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
503 | dget(lower_dentry); | |
504 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
505 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
506 | dir->i_sb)->mount_crypt_stat; | |
507 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
508 | &encoded_symlen, | |
509 | NULL, | |
510 | mount_crypt_stat, symname, | |
511 | strlen(symname)); | |
512 | if (rc) | |
237fead6 | 513 | goto out_lock; |
237fead6 | 514 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, |
db2e747b | 515 | encoded_symname); |
237fead6 MH |
516 | kfree(encoded_symname); |
517 | if (rc || !lower_dentry->d_inode) | |
518 | goto out_lock; | |
5ccf9203 | 519 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
520 | if (rc) |
521 | goto out_lock; | |
0cc72dc7 JJS |
522 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
523 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
524 | out_lock: |
525 | unlock_dir(lower_dir_dentry); | |
526 | dput(lower_dentry); | |
527 | if (!dentry->d_inode) | |
528 | d_drop(dentry); | |
529 | return rc; | |
530 | } | |
531 | ||
18bb1db3 | 532 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
237fead6 MH |
533 | { |
534 | int rc; | |
535 | struct dentry *lower_dentry; | |
536 | struct dentry *lower_dir_dentry; | |
537 | ||
538 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
539 | lower_dir_dentry = lock_parent(lower_dentry); | |
540 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
541 | if (rc || !lower_dentry->d_inode) | |
542 | goto out; | |
5ccf9203 | 543 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
544 | if (rc) |
545 | goto out; | |
0cc72dc7 JJS |
546 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
547 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
bfe86848 | 548 | set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); |
237fead6 MH |
549 | out: |
550 | unlock_dir(lower_dir_dentry); | |
551 | if (!dentry->d_inode) | |
552 | d_drop(dentry); | |
553 | return rc; | |
554 | } | |
555 | ||
556 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
557 | { | |
237fead6 | 558 | struct dentry *lower_dentry; |
237fead6 | 559 | struct dentry *lower_dir_dentry; |
45ec4aba | 560 | int rc; |
237fead6 MH |
561 | |
562 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 563 | dget(dentry); |
237fead6 | 564 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 565 | dget(lower_dentry); |
237fead6 | 566 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba | 567 | dput(lower_dentry); |
07850552 TH |
568 | if (!rc && dentry->d_inode) |
569 | clear_nlink(dentry->d_inode); | |
0cc72dc7 | 570 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
bfe86848 | 571 | set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); |
237fead6 MH |
572 | unlock_dir(lower_dir_dentry); |
573 | if (!rc) | |
574 | d_drop(dentry); | |
45ec4aba | 575 | dput(dentry); |
237fead6 MH |
576 | return rc; |
577 | } | |
578 | ||
579 | static int | |
1a67aafb | 580 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
237fead6 MH |
581 | { |
582 | int rc; | |
583 | struct dentry *lower_dentry; | |
584 | struct dentry *lower_dir_dentry; | |
585 | ||
586 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
587 | lower_dir_dentry = lock_parent(lower_dentry); | |
588 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
589 | if (rc || !lower_dentry->d_inode) | |
590 | goto out; | |
5ccf9203 | 591 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
592 | if (rc) |
593 | goto out; | |
0cc72dc7 JJS |
594 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
595 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
596 | out: |
597 | unlock_dir(lower_dir_dentry); | |
598 | if (!dentry->d_inode) | |
599 | d_drop(dentry); | |
600 | return rc; | |
601 | } | |
602 | ||
603 | static int | |
604 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
605 | struct inode *new_dir, struct dentry *new_dentry) | |
606 | { | |
607 | int rc; | |
608 | struct dentry *lower_old_dentry; | |
609 | struct dentry *lower_new_dentry; | |
610 | struct dentry *lower_old_dir_dentry; | |
611 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 612 | struct dentry *trap = NULL; |
8335eafc | 613 | struct inode *target_inode; |
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); | |
8335eafc | 621 | target_inode = new_dentry->d_inode; |
0d132f73 EZ |
622 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
623 | /* source should not be ancestor of target */ | |
624 | if (trap == lower_old_dentry) { | |
625 | rc = -EINVAL; | |
626 | goto out_lock; | |
627 | } | |
628 | /* target should not be ancestor of source */ | |
629 | if (trap == lower_new_dentry) { | |
630 | rc = -ENOTEMPTY; | |
631 | goto out_lock; | |
632 | } | |
237fead6 | 633 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, |
8e6d782c | 634 | lower_new_dir_dentry->d_inode, lower_new_dentry, |
520c8b16 | 635 | NULL, 0); |
237fead6 MH |
636 | if (rc) |
637 | goto out_lock; | |
8335eafc TH |
638 | if (target_inode) |
639 | fsstack_copy_attr_all(target_inode, | |
640 | ecryptfs_inode_to_lower(target_inode)); | |
9afa2fb6 | 641 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); |
237fead6 | 642 | if (new_dir != old_dir) |
9afa2fb6 | 643 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); |
237fead6 MH |
644 | out_lock: |
645 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
dd55c898 TH |
646 | dput(lower_new_dir_dentry); |
647 | dput(lower_old_dir_dentry); | |
237fead6 MH |
648 | dput(lower_new_dentry); |
649 | dput(lower_old_dentry); | |
650 | return rc; | |
651 | } | |
652 | ||
b22e8fed | 653 | static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) |
237fead6 | 654 | { |
3a60a168 | 655 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
237fead6 | 656 | char *lower_buf; |
b22e8fed | 657 | char *buf; |
addd65ad MH |
658 | mm_segment_t old_fs; |
659 | int rc; | |
237fead6 | 660 | |
408bd629 | 661 | lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); |
b22e8fed AV |
662 | if (!lower_buf) |
663 | return ERR_PTR(-ENOMEM); | |
237fead6 MH |
664 | old_fs = get_fs(); |
665 | set_fs(get_ds()); | |
237fead6 MH |
666 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, |
667 | (char __user *)lower_buf, | |
408bd629 | 668 | PATH_MAX); |
237fead6 | 669 | set_fs(old_fs); |
3a60a168 TH |
670 | if (rc < 0) |
671 | goto out; | |
b22e8fed | 672 | rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, |
408bd629 | 673 | lower_buf, rc); |
3a60a168 | 674 | out: |
237fead6 | 675 | kfree(lower_buf); |
b22e8fed | 676 | return rc ? ERR_PTR(rc) : buf; |
3a60a168 TH |
677 | } |
678 | ||
408bd629 | 679 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) |
3a60a168 | 680 | { |
b22e8fed AV |
681 | size_t len; |
682 | char *buf = ecryptfs_readlink_lower(dentry, &len); | |
683 | if (IS_ERR(buf)) | |
3a60a168 | 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 | ||
237fead6 MH |
693 | /** |
694 | * upper_size_to_lower_size | |
695 | * @crypt_stat: Crypt_stat associated with file | |
696 | * @upper_size: Size of the upper file | |
697 | * | |
cc11beff | 698 | * Calculate the required size of the lower file based on the |
237fead6 MH |
699 | * specified size of the upper file. This calculation is based on the |
700 | * number of headers in the underlying file and the extent size. | |
701 | * | |
702 | * Returns Calculated size of the lower file. | |
703 | */ | |
704 | static loff_t | |
705 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
706 | loff_t upper_size) | |
707 | { | |
708 | loff_t lower_size; | |
709 | ||
157f1071 | 710 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
711 | if (upper_size != 0) { |
712 | loff_t num_extents; | |
713 | ||
714 | num_extents = upper_size >> crypt_stat->extent_shift; | |
715 | if (upper_size & ~crypt_stat->extent_mask) | |
716 | num_extents++; | |
717 | lower_size += (num_extents * crypt_stat->extent_size); | |
718 | } | |
719 | return lower_size; | |
720 | } | |
721 | ||
722 | /** | |
5f3ef64f | 723 | * truncate_upper |
237fead6 | 724 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
725 | * @ia: Address of the ecryptfs inode's attributes |
726 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
727 | * |
728 | * Function to handle truncations modifying the size of the file. Note | |
729 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
730 | * writing strings of 0's out. When truncating, we truncate the upper |
731 | * inode and update the lower_ia according to the page index | |
732 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
733 | * the caller must use lower_ia in a call to notify_change() to perform | |
734 | * the truncation of the lower inode. | |
237fead6 MH |
735 | * |
736 | * Returns zero on success; non-zero otherwise | |
737 | */ | |
5f3ef64f TH |
738 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
739 | struct iattr *lower_ia) | |
237fead6 MH |
740 | { |
741 | int rc = 0; | |
742 | struct inode *inode = dentry->d_inode; | |
237fead6 MH |
743 | struct ecryptfs_crypt_stat *crypt_stat; |
744 | loff_t i_size = i_size_read(inode); | |
745 | loff_t lower_size_before_truncate; | |
746 | loff_t lower_size_after_truncate; | |
747 | ||
5f3ef64f TH |
748 | if (unlikely((ia->ia_size == i_size))) { |
749 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 750 | return 0; |
5f3ef64f | 751 | } |
3b06b3eb | 752 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
753 | if (rc) |
754 | return rc; | |
237fead6 | 755 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
237fead6 | 756 | /* Switch on growing or shrinking file */ |
5f3ef64f | 757 | if (ia->ia_size > i_size) { |
2ed92554 MH |
758 | char zero[] = { 0x00 }; |
759 | ||
5f3ef64f | 760 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
761 | /* Write a single 0 at the last position of the file; |
762 | * this triggers code that will fill in 0's throughout | |
763 | * the intermediate portion of the previous end of the | |
764 | * file and the new and of the file */ | |
48c1e44a | 765 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
766 | (ia->ia_size - 1), 1); |
767 | } else { /* ia->ia_size < i_size_read(inode) */ | |
768 | /* We're chopping off all the pages down to the page | |
769 | * in which ia->ia_size is located. Fill in the end of | |
770 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to | |
2ed92554 MH |
771 | * PAGE_CACHE_SIZE with zeros. */ |
772 | size_t num_zeros = (PAGE_CACHE_SIZE | |
5f3ef64f | 773 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
2ed92554 | 774 | |
13a791b4 | 775 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 776 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
777 | lower_ia->ia_size = ia->ia_size; |
778 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 779 | goto out; |
13a791b4 | 780 | } |
2ed92554 MH |
781 | if (num_zeros) { |
782 | char *zeros_virt; | |
783 | ||
784 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
785 | if (!zeros_virt) { | |
786 | rc = -ENOMEM; | |
48c1e44a | 787 | goto out; |
2ed92554 | 788 | } |
48c1e44a | 789 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 790 | ia->ia_size, num_zeros); |
2ed92554 | 791 | kfree(zeros_virt); |
5dda6992 | 792 | if (rc) { |
240e2df5 MH |
793 | printk(KERN_ERR "Error attempting to zero out " |
794 | "the remainder of the end page on " | |
795 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 796 | goto out; |
240e2df5 MH |
797 | } |
798 | } | |
2c27c65e | 799 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 800 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
801 | if (rc) { |
802 | printk(KERN_ERR "Problem with " | |
803 | "ecryptfs_write_inode_size_to_metadata; " | |
804 | "rc = [%d]\n", rc); | |
48c1e44a | 805 | goto out; |
dd2a3b7a | 806 | } |
237fead6 MH |
807 | /* We are reducing the size of the ecryptfs file, and need to |
808 | * know if we need to reduce the size of the lower file. */ | |
809 | lower_size_before_truncate = | |
810 | upper_size_to_lower_size(crypt_stat, i_size); | |
811 | lower_size_after_truncate = | |
5f3ef64f TH |
812 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
813 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
814 | lower_ia->ia_size = lower_size_after_truncate; | |
815 | lower_ia->ia_valid |= ATTR_SIZE; | |
816 | } else | |
817 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 818 | } |
237fead6 | 819 | out: |
332ab16f | 820 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
821 | return rc; |
822 | } | |
823 | ||
a261a039 TH |
824 | static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) |
825 | { | |
826 | struct ecryptfs_crypt_stat *crypt_stat; | |
827 | loff_t lower_oldsize, lower_newsize; | |
828 | ||
829 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
830 | lower_oldsize = upper_size_to_lower_size(crypt_stat, | |
831 | i_size_read(inode)); | |
832 | lower_newsize = upper_size_to_lower_size(crypt_stat, offset); | |
833 | if (lower_newsize > lower_oldsize) { | |
834 | /* | |
835 | * The eCryptfs inode and the new *lower* size are mixed here | |
836 | * because we may not have the lower i_mutex held and/or it may | |
837 | * not be appropriate to call inode_newsize_ok() with inodes | |
838 | * from other filesystems. | |
839 | */ | |
840 | return inode_newsize_ok(inode, lower_newsize); | |
841 | } | |
842 | ||
843 | return 0; | |
844 | } | |
845 | ||
5f3ef64f TH |
846 | /** |
847 | * ecryptfs_truncate | |
848 | * @dentry: The ecryptfs layer dentry | |
849 | * @new_length: The length to expand the file to | |
850 | * | |
851 | * Simple function that handles the truncation of an eCryptfs inode and | |
852 | * its corresponding lower inode. | |
853 | * | |
854 | * Returns zero on success; non-zero otherwise | |
855 | */ | |
856 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
857 | { | |
858 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
859 | struct iattr lower_ia = { .ia_valid = 0 }; | |
860 | int rc; | |
861 | ||
a261a039 TH |
862 | rc = ecryptfs_inode_newsize_ok(dentry->d_inode, new_length); |
863 | if (rc) | |
864 | return rc; | |
865 | ||
5f3ef64f TH |
866 | rc = truncate_upper(dentry, &ia, &lower_ia); |
867 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
868 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
869 | ||
870 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
27ac0ffe | 871 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
5f3ef64f TH |
872 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
873 | } | |
874 | return rc; | |
875 | } | |
876 | ||
237fead6 | 877 | static int |
10556cb2 | 878 | ecryptfs_permission(struct inode *inode, int mask) |
237fead6 | 879 | { |
f419a2e3 | 880 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
881 | } |
882 | ||
883 | /** | |
884 | * ecryptfs_setattr | |
885 | * @dentry: dentry handle to the inode to modify | |
886 | * @ia: Structure with flags of what to change and values | |
887 | * | |
888 | * Updates the metadata of an inode. If the update is to the size | |
889 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
890 | * of both the ecryptfs inode and the lower inode. | |
891 | * | |
892 | * All other metadata changes will be passed right to the lower filesystem, | |
893 | * and we will just update our inode to look like the lower. | |
894 | */ | |
895 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
896 | { | |
897 | int rc = 0; | |
898 | struct dentry *lower_dentry; | |
5f3ef64f | 899 | struct iattr lower_ia; |
237fead6 MH |
900 | struct inode *inode; |
901 | struct inode *lower_inode; | |
902 | struct ecryptfs_crypt_stat *crypt_stat; | |
903 | ||
904 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
905 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
906 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
907 | inode = dentry->d_inode; |
908 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
909 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
910 | mutex_lock(&crypt_stat->cs_mutex); | |
911 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
912 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
913 | else if (S_ISREG(dentry->d_inode->i_mode) |
914 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
915 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 916 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 917 | |
e10f281b MH |
918 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
919 | dentry->d_sb)->mount_crypt_stat; | |
3b06b3eb | 920 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
921 | if (rc) { |
922 | mutex_unlock(&crypt_stat->cs_mutex); | |
923 | goto out; | |
924 | } | |
d7cdc5fe | 925 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 926 | ecryptfs_put_lower_file(inode); |
5dda6992 | 927 | if (rc) { |
e10f281b MH |
928 | if (!(mount_crypt_stat->flags |
929 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
930 | rc = -EIO; | |
25bd8174 | 931 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 932 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
933 | "or the key could not be retrieved. " |
934 | "Plaintext passthrough mode is not " | |
e10f281b | 935 | "enabled; returning -EIO\n"); |
e10f281b | 936 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
937 | goto out; |
938 | } | |
939 | rc = 0; | |
3aeb86ea TH |
940 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
941 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 942 | } |
e10f281b MH |
943 | } |
944 | mutex_unlock(&crypt_stat->cs_mutex); | |
a261a039 TH |
945 | |
946 | rc = inode_change_ok(inode, ia); | |
947 | if (rc) | |
948 | goto out; | |
949 | if (ia->ia_valid & ATTR_SIZE) { | |
950 | rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); | |
951 | if (rc) | |
952 | goto out; | |
953 | } | |
954 | ||
5f3ef64f TH |
955 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
956 | if (ia->ia_valid & ATTR_FILE) | |
957 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 958 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 959 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
960 | if (rc < 0) |
961 | goto out; | |
962 | } | |
1ac564ec JL |
963 | |
964 | /* | |
965 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
966 | * to interpret this in its own way. | |
967 | */ | |
5f3ef64f TH |
968 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
969 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 970 | |
9c3580aa | 971 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
27ac0ffe | 972 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
9c3580aa | 973 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
237fead6 | 974 | out: |
9afa2fb6 | 975 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
976 | return rc; |
977 | } | |
978 | ||
111d61a2 TH |
979 | static int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
980 | struct kstat *stat) | |
3a60a168 TH |
981 | { |
982 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; | |
983 | int rc = 0; | |
984 | ||
985 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
986 | dentry->d_sb)->mount_crypt_stat; | |
987 | generic_fillattr(dentry->d_inode, stat); | |
988 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { | |
989 | char *target; | |
990 | size_t targetsiz; | |
991 | ||
b22e8fed AV |
992 | target = ecryptfs_readlink_lower(dentry, &targetsiz); |
993 | if (!IS_ERR(target)) { | |
3a60a168 TH |
994 | kfree(target); |
995 | stat->size = targetsiz; | |
b22e8fed AV |
996 | } else { |
997 | rc = PTR_ERR(target); | |
3a60a168 TH |
998 | } |
999 | } | |
1000 | return rc; | |
1001 | } | |
1002 | ||
111d61a2 TH |
1003 | static int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1004 | struct kstat *stat) | |
f8f484d1 TH |
1005 | { |
1006 | struct kstat lower_stat; | |
1007 | int rc; | |
1008 | ||
3dadecce | 1009 | rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat); |
f8f484d1 | 1010 | if (!rc) { |
55f9cf6b TH |
1011 | fsstack_copy_attr_all(dentry->d_inode, |
1012 | ecryptfs_inode_to_lower(dentry->d_inode)); | |
f8f484d1 TH |
1013 | generic_fillattr(dentry->d_inode, stat); |
1014 | stat->blocks = lower_stat.blocks; | |
1015 | } | |
1016 | return rc; | |
1017 | } | |
1018 | ||
dd2a3b7a | 1019 | int |
237fead6 MH |
1020 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
1021 | size_t size, int flags) | |
1022 | { | |
1023 | int rc = 0; | |
1024 | struct dentry *lower_dentry; | |
1025 | ||
1026 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1027 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
cfce08c6 | 1028 | rc = -EOPNOTSUPP; |
237fead6 MH |
1029 | goto out; |
1030 | } | |
48b512e6 RS |
1031 | |
1032 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); | |
35425ea2 | 1033 | if (!rc && dentry->d_inode) |
545d6809 | 1034 | fsstack_copy_attr_all(dentry->d_inode, lower_dentry->d_inode); |
237fead6 MH |
1035 | out: |
1036 | return rc; | |
1037 | } | |
1038 | ||
d7cdc5fe MH |
1039 | ssize_t |
1040 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
1041 | void *value, size_t size) | |
1042 | { | |
1043 | int rc = 0; | |
1044 | ||
1045 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
cfce08c6 | 1046 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1047 | goto out; |
1048 | } | |
1049 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1050 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
1051 | size); | |
1052 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1053 | out: | |
1054 | return rc; | |
1055 | } | |
1056 | ||
7896b631 | 1057 | static ssize_t |
237fead6 MH |
1058 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
1059 | size_t size) | |
1060 | { | |
2ed92554 MH |
1061 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
1062 | value, size); | |
237fead6 MH |
1063 | } |
1064 | ||
1065 | static ssize_t | |
1066 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1067 | { | |
1068 | int rc = 0; | |
1069 | struct dentry *lower_dentry; | |
1070 | ||
1071 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1072 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
cfce08c6 | 1073 | rc = -EOPNOTSUPP; |
237fead6 MH |
1074 | goto out; |
1075 | } | |
1076 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1077 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
1078 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1079 | out: | |
1080 | return rc; | |
1081 | } | |
1082 | ||
1083 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
1084 | { | |
1085 | int rc = 0; | |
1086 | struct dentry *lower_dentry; | |
1087 | ||
1088 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1089 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
cfce08c6 | 1090 | rc = -EOPNOTSUPP; |
237fead6 MH |
1091 | goto out; |
1092 | } | |
1093 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1094 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
1095 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1096 | out: | |
1097 | return rc; | |
1098 | } | |
1099 | ||
754661f1 | 1100 | const struct inode_operations ecryptfs_symlink_iops = { |
408bd629 | 1101 | .readlink = generic_readlink, |
237fead6 | 1102 | .follow_link = ecryptfs_follow_link, |
87dc800b | 1103 | .put_link = kfree_put_link, |
237fead6 MH |
1104 | .permission = ecryptfs_permission, |
1105 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1106 | .getattr = ecryptfs_getattr_link, |
237fead6 MH |
1107 | .setxattr = ecryptfs_setxattr, |
1108 | .getxattr = ecryptfs_getxattr, | |
1109 | .listxattr = ecryptfs_listxattr, | |
1110 | .removexattr = ecryptfs_removexattr | |
1111 | }; | |
1112 | ||
754661f1 | 1113 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1114 | .create = ecryptfs_create, |
1115 | .lookup = ecryptfs_lookup, | |
1116 | .link = ecryptfs_link, | |
1117 | .unlink = ecryptfs_unlink, | |
1118 | .symlink = ecryptfs_symlink, | |
1119 | .mkdir = ecryptfs_mkdir, | |
1120 | .rmdir = ecryptfs_rmdir, | |
1121 | .mknod = ecryptfs_mknod, | |
1122 | .rename = ecryptfs_rename, | |
1123 | .permission = ecryptfs_permission, | |
1124 | .setattr = ecryptfs_setattr, | |
1125 | .setxattr = ecryptfs_setxattr, | |
1126 | .getxattr = ecryptfs_getxattr, | |
1127 | .listxattr = ecryptfs_listxattr, | |
1128 | .removexattr = ecryptfs_removexattr | |
1129 | }; | |
1130 | ||
754661f1 | 1131 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1132 | .permission = ecryptfs_permission, |
1133 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1134 | .getattr = ecryptfs_getattr, |
237fead6 MH |
1135 | .setxattr = ecryptfs_setxattr, |
1136 | .getxattr = ecryptfs_getxattr, | |
1137 | .listxattr = ecryptfs_listxattr, | |
1138 | .removexattr = ecryptfs_removexattr | |
1139 | }; |