Commit | Line | Data |
---|---|---|
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> |
0a688ad7 | 34 | #include <asm/unaligned.h> |
237fead6 MH |
35 | #include "ecryptfs_kernel.h" |
36 | ||
37 | static struct dentry *lock_parent(struct dentry *dentry) | |
38 | { | |
39 | struct dentry *dir; | |
40 | ||
8dc4e373 | 41 | dir = dget_parent(dentry); |
908e0a8a | 42 | mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); |
237fead6 MH |
43 | return dir; |
44 | } | |
45 | ||
237fead6 MH |
46 | static void unlock_dir(struct dentry *dir) |
47 | { | |
48 | mutex_unlock(&dir->d_inode->i_mutex); | |
49 | dput(dir); | |
50 | } | |
51 | ||
237fead6 MH |
52 | /** |
53 | * ecryptfs_create_underlying_file | |
54 | * @lower_dir_inode: inode of the parent in the lower fs of the new file | |
55 | * @lower_dentry: New file's dentry in the lower fs | |
56 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
57 | * @mode: The mode of the new file | |
58 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
59 | * | |
60 | * Creates the file in the lower file system. | |
61 | * | |
62 | * Returns zero on success; non-zero on error condition | |
63 | */ | |
64 | static int | |
65 | ecryptfs_create_underlying_file(struct inode *lower_dir_inode, | |
66 | struct dentry *dentry, int mode, | |
67 | struct nameidata *nd) | |
68 | { | |
69 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
70 | struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); | |
71 | struct dentry *dentry_save; | |
72 | struct vfsmount *vfsmount_save; | |
73 | int rc; | |
74 | ||
4ac91378 JB |
75 | dentry_save = nd->path.dentry; |
76 | vfsmount_save = nd->path.mnt; | |
77 | nd->path.dentry = lower_dentry; | |
78 | nd->path.mnt = lower_mnt; | |
237fead6 | 79 | rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); |
4ac91378 JB |
80 | nd->path.dentry = dentry_save; |
81 | nd->path.mnt = vfsmount_save; | |
237fead6 MH |
82 | return rc; |
83 | } | |
84 | ||
85 | /** | |
86 | * ecryptfs_do_create | |
87 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
88 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
89 | * @mode: The mode of the new file | |
90 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
91 | * | |
92 | * Creates the underlying file and the eCryptfs inode which will link to | |
93 | * it. It will also update the eCryptfs directory inode to mimic the | |
94 | * stat of the lower directory inode. | |
95 | * | |
96 | * Returns zero on success; non-zero on error condition | |
97 | */ | |
98 | static int | |
99 | ecryptfs_do_create(struct inode *directory_inode, | |
100 | struct dentry *ecryptfs_dentry, int mode, | |
101 | struct nameidata *nd) | |
102 | { | |
103 | int rc; | |
104 | struct dentry *lower_dentry; | |
105 | struct dentry *lower_dir_dentry; | |
106 | ||
107 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
108 | lower_dir_dentry = lock_parent(lower_dentry); | |
801678c5 | 109 | if (IS_ERR(lower_dir_dentry)) { |
237fead6 MH |
110 | ecryptfs_printk(KERN_ERR, "Error locking directory of " |
111 | "dentry\n"); | |
112 | rc = PTR_ERR(lower_dir_dentry); | |
113 | goto out; | |
114 | } | |
115 | rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, | |
116 | ecryptfs_dentry, mode, nd); | |
4981e081 | 117 | if (rc) { |
caeeeecf | 118 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 119 | "rc = [%d]\n", __func__, rc); |
caeeeecf | 120 | goto out_lock; |
237fead6 MH |
121 | } |
122 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, | |
123 | directory_inode->i_sb, 0); | |
124 | if (rc) { | |
125 | ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); | |
126 | goto out_lock; | |
127 | } | |
0cc72dc7 JJS |
128 | fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); |
129 | fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); | |
237fead6 MH |
130 | out_lock: |
131 | unlock_dir(lower_dir_dentry); | |
132 | out: | |
133 | return rc; | |
134 | } | |
135 | ||
136 | /** | |
137 | * grow_file | |
d7cdc5fe | 138 | * @ecryptfs_dentry: the eCryptfs dentry |
237fead6 MH |
139 | * |
140 | * This is the code which will grow the file to its correct size. | |
141 | */ | |
d7cdc5fe | 142 | static int grow_file(struct dentry *ecryptfs_dentry) |
237fead6 | 143 | { |
d7cdc5fe | 144 | struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode; |
237fead6 MH |
145 | struct file fake_file; |
146 | struct ecryptfs_file_info tmp_file_info; | |
d7cdc5fe MH |
147 | char zero_virt[] = { 0x00 }; |
148 | int rc = 0; | |
237fead6 MH |
149 | |
150 | memset(&fake_file, 0, sizeof(fake_file)); | |
bd243a4b | 151 | fake_file.f_path.dentry = ecryptfs_dentry; |
237fead6 MH |
152 | memset(&tmp_file_info, 0, sizeof(tmp_file_info)); |
153 | ecryptfs_set_file_private(&fake_file, &tmp_file_info); | |
d7cdc5fe MH |
154 | ecryptfs_set_file_lower( |
155 | &fake_file, | |
156 | ecryptfs_inode_to_private(ecryptfs_inode)->lower_file); | |
157 | rc = ecryptfs_write(&fake_file, zero_virt, 0, 1); | |
158 | i_size_write(ecryptfs_inode, 0); | |
159 | rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode); | |
160 | ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |= | |
161 | ECRYPTFS_NEW_FILE; | |
237fead6 MH |
162 | return rc; |
163 | } | |
164 | ||
165 | /** | |
166 | * ecryptfs_initialize_file | |
167 | * | |
168 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
169 | * file with a header and first data page. | |
170 | * | |
171 | * Returns zero on success | |
172 | */ | |
173 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) | |
174 | { | |
d7cdc5fe MH |
175 | struct ecryptfs_crypt_stat *crypt_stat = |
176 | &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; | |
237fead6 | 177 | int rc = 0; |
237fead6 | 178 | |
237fead6 MH |
179 | if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { |
180 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); | |
e2bd99ec | 181 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 182 | goto out; |
237fead6 | 183 | } |
e2bd99ec | 184 | crypt_stat->flags |= ECRYPTFS_NEW_FILE; |
237fead6 MH |
185 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
186 | rc = ecryptfs_new_file_context(ecryptfs_dentry); | |
187 | if (rc) { | |
d7cdc5fe MH |
188 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
189 | "context; rc = [%d]\n", rc); | |
190 | goto out; | |
237fead6 | 191 | } |
d7cdc5fe | 192 | rc = ecryptfs_write_metadata(ecryptfs_dentry); |
237fead6 | 193 | if (rc) { |
d7cdc5fe MH |
194 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
195 | goto out; | |
237fead6 | 196 | } |
d7cdc5fe | 197 | rc = grow_file(ecryptfs_dentry); |
5dda6992 | 198 | if (rc) |
d7cdc5fe | 199 | printk(KERN_ERR "Error growing file; rc = [%d]\n", rc); |
237fead6 MH |
200 | out: |
201 | return rc; | |
202 | } | |
203 | ||
204 | /** | |
205 | * ecryptfs_create | |
206 | * @dir: The inode of the directory in which to create the file. | |
207 | * @dentry: The eCryptfs dentry | |
208 | * @mode: The mode of the new file. | |
209 | * @nd: nameidata | |
210 | * | |
211 | * Creates a new file. | |
212 | * | |
213 | * Returns zero on success; non-zero on error condition | |
214 | */ | |
215 | static int | |
216 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
217 | int mode, struct nameidata *nd) | |
218 | { | |
219 | int rc; | |
220 | ||
4981e081 MH |
221 | /* ecryptfs_do_create() calls ecryptfs_interpose(), which opens |
222 | * the crypt_stat->lower_file (persistent file) */ | |
237fead6 MH |
223 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); |
224 | if (unlikely(rc)) { | |
225 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" | |
226 | "lower filesystem\n"); | |
227 | goto out; | |
228 | } | |
229 | /* At this point, a file exists on "disk"; we need to make sure | |
230 | * that this on disk file is prepared to be an ecryptfs file */ | |
231 | rc = ecryptfs_initialize_file(ecryptfs_dentry); | |
232 | out: | |
233 | return rc; | |
234 | } | |
235 | ||
236 | /** | |
237 | * ecryptfs_lookup | |
238 | * @dir: inode | |
239 | * @dentry: The dentry | |
240 | * @nd: nameidata, may be NULL | |
241 | * | |
242 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
243 | * dentry cache and continue on to read it from the disk. | |
244 | */ | |
245 | static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, | |
246 | struct nameidata *nd) | |
247 | { | |
248 | int rc = 0; | |
249 | struct dentry *lower_dir_dentry; | |
250 | struct dentry *lower_dentry; | |
251 | struct vfsmount *lower_mnt; | |
237fead6 | 252 | char *encoded_name; |
c381bfcf | 253 | int encoded_namelen; |
237fead6 | 254 | struct ecryptfs_crypt_stat *crypt_stat = NULL; |
e77a56dd | 255 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
237fead6 MH |
256 | char *page_virt = NULL; |
257 | struct inode *lower_inode; | |
258 | u64 file_size; | |
259 | ||
260 | lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); | |
261 | dentry->d_op = &ecryptfs_dops; | |
262 | if ((dentry->d_name.len == 1 && !strcmp(dentry->d_name.name, ".")) | |
45ec4aba MH |
263 | || (dentry->d_name.len == 2 |
264 | && !strcmp(dentry->d_name.name, ".."))) { | |
265 | d_drop(dentry); | |
266 | goto out; | |
267 | } | |
237fead6 MH |
268 | encoded_namelen = ecryptfs_encode_filename(crypt_stat, |
269 | dentry->d_name.name, | |
270 | dentry->d_name.len, | |
271 | &encoded_name); | |
272 | if (encoded_namelen < 0) { | |
273 | rc = encoded_namelen; | |
45ec4aba MH |
274 | d_drop(dentry); |
275 | goto out; | |
237fead6 MH |
276 | } |
277 | ecryptfs_printk(KERN_DEBUG, "encoded_name = [%s]; encoded_namelen " | |
278 | "= [%d]\n", encoded_name, encoded_namelen); | |
279 | lower_dentry = lookup_one_len(encoded_name, lower_dir_dentry, | |
280 | encoded_namelen - 1); | |
281 | kfree(encoded_name); | |
237fead6 MH |
282 | if (IS_ERR(lower_dentry)) { |
283 | ecryptfs_printk(KERN_ERR, "ERR from lower_dentry\n"); | |
284 | rc = PTR_ERR(lower_dentry); | |
45ec4aba MH |
285 | d_drop(dentry); |
286 | goto out; | |
237fead6 | 287 | } |
45ec4aba | 288 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); |
237fead6 MH |
289 | ecryptfs_printk(KERN_DEBUG, "lower_dentry = [%p]; lower_dentry->" |
290 | "d_name.name = [%s]\n", lower_dentry, | |
291 | lower_dentry->d_name.name); | |
292 | lower_inode = lower_dentry->d_inode; | |
0cc72dc7 | 293 | fsstack_copy_attr_atime(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
294 | BUG_ON(!atomic_read(&lower_dentry->d_count)); |
295 | ecryptfs_set_dentry_private(dentry, | |
296 | kmem_cache_alloc(ecryptfs_dentry_info_cache, | |
e94b1766 | 297 | GFP_KERNEL)); |
237fead6 MH |
298 | if (!ecryptfs_dentry_to_private(dentry)) { |
299 | rc = -ENOMEM; | |
300 | ecryptfs_printk(KERN_ERR, "Out of memory whilst attempting " | |
301 | "to allocate ecryptfs_dentry_info struct\n"); | |
302 | goto out_dput; | |
303 | } | |
304 | ecryptfs_set_dentry_lower(dentry, lower_dentry); | |
305 | ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); | |
306 | if (!lower_dentry->d_inode) { | |
307 | /* We want to add because we couldn't find in lower */ | |
308 | d_add(dentry, NULL); | |
309 | goto out; | |
310 | } | |
72b55fff MH |
311 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, |
312 | ECRYPTFS_INTERPOSE_FLAG_D_ADD); | |
237fead6 MH |
313 | if (rc) { |
314 | ecryptfs_printk(KERN_ERR, "Error interposing\n"); | |
315 | goto out_dput; | |
316 | } | |
317 | if (S_ISDIR(lower_inode->i_mode)) { | |
318 | ecryptfs_printk(KERN_DEBUG, "Is a directory; returning\n"); | |
319 | goto out; | |
320 | } | |
321 | if (S_ISLNK(lower_inode->i_mode)) { | |
322 | ecryptfs_printk(KERN_DEBUG, "Is a symlink; returning\n"); | |
323 | goto out; | |
324 | } | |
202a21d6 RK |
325 | if (special_file(lower_inode->i_mode)) { |
326 | ecryptfs_printk(KERN_DEBUG, "Is a special file; returning\n"); | |
327 | goto out; | |
328 | } | |
237fead6 MH |
329 | if (!nd) { |
330 | ecryptfs_printk(KERN_DEBUG, "We have a NULL nd, just leave" | |
331 | "as we *think* we are about to unlink\n"); | |
332 | goto out; | |
333 | } | |
237fead6 | 334 | /* Released in this function */ |
c3762229 | 335 | page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, |
dd2a3b7a | 336 | GFP_USER); |
237fead6 MH |
337 | if (!page_virt) { |
338 | rc = -ENOMEM; | |
339 | ecryptfs_printk(KERN_ERR, | |
340 | "Cannot ecryptfs_kmalloc a page\n"); | |
341 | goto out_dput; | |
342 | } | |
237fead6 | 343 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
e2bd99ec | 344 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) |
237fead6 | 345 | ecryptfs_set_default_sizes(crypt_stat); |
d7cdc5fe MH |
346 | rc = ecryptfs_read_and_validate_header_region(page_virt, |
347 | dentry->d_inode); | |
237fead6 | 348 | if (rc) { |
dd2a3b7a MH |
349 | rc = ecryptfs_read_and_validate_xattr_region(page_virt, dentry); |
350 | if (rc) { | |
351 | printk(KERN_DEBUG "Valid metadata not found in header " | |
352 | "region or xattr region; treating file as " | |
353 | "unencrypted\n"); | |
354 | rc = 0; | |
237fead6 MH |
355 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
356 | goto out; | |
357 | } | |
dd2a3b7a | 358 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
237fead6 | 359 | } |
e77a56dd MH |
360 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
361 | dentry->d_sb)->mount_crypt_stat; | |
362 | if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { | |
363 | if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) | |
cc11beff | 364 | file_size = (crypt_stat->num_header_bytes_at_front |
e77a56dd MH |
365 | + i_size_read(lower_dentry->d_inode)); |
366 | else | |
367 | file_size = i_size_read(lower_dentry->d_inode); | |
368 | } else { | |
0a688ad7 | 369 | file_size = get_unaligned_be64(page_virt); |
e77a56dd | 370 | } |
dd2a3b7a | 371 | i_size_write(dentry->d_inode, (loff_t)file_size); |
237fead6 MH |
372 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
373 | goto out; | |
374 | ||
375 | out_dput: | |
376 | dput(lower_dentry); | |
237fead6 MH |
377 | d_drop(dentry); |
378 | out: | |
379 | return ERR_PTR(rc); | |
380 | } | |
381 | ||
382 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
383 | struct dentry *new_dentry) | |
384 | { | |
385 | struct dentry *lower_old_dentry; | |
386 | struct dentry *lower_new_dentry; | |
387 | struct dentry *lower_dir_dentry; | |
388 | u64 file_size_save; | |
389 | int rc; | |
390 | ||
391 | file_size_save = i_size_read(old_dentry->d_inode); | |
392 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
393 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
394 | dget(lower_old_dentry); | |
395 | dget(lower_new_dentry); | |
396 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
397 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
398 | lower_new_dentry); | |
399 | if (rc || !lower_new_dentry->d_inode) | |
400 | goto out_lock; | |
401 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); | |
402 | if (rc) | |
403 | goto out_lock; | |
0cc72dc7 JJS |
404 | fsstack_copy_attr_times(dir, lower_new_dentry->d_inode); |
405 | fsstack_copy_inode_size(dir, lower_new_dentry->d_inode); | |
237fead6 MH |
406 | old_dentry->d_inode->i_nlink = |
407 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; | |
408 | i_size_write(new_dentry->d_inode, file_size_save); | |
409 | out_lock: | |
410 | unlock_dir(lower_dir_dentry); | |
411 | dput(lower_new_dentry); | |
412 | dput(lower_old_dentry); | |
ae56fb16 | 413 | d_drop(lower_old_dentry); |
45ec4aba MH |
414 | d_drop(new_dentry); |
415 | d_drop(old_dentry); | |
237fead6 MH |
416 | return rc; |
417 | } | |
418 | ||
419 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
420 | { | |
421 | int rc = 0; | |
422 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
423 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
8dc4e373 | 424 | struct dentry *lower_dir_dentry; |
237fead6 | 425 | |
8dc4e373 | 426 | lower_dir_dentry = lock_parent(lower_dentry); |
237fead6 MH |
427 | rc = vfs_unlink(lower_dir_inode, lower_dentry); |
428 | if (rc) { | |
ae56fb16 | 429 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
430 | goto out_unlock; |
431 | } | |
0cc72dc7 | 432 | fsstack_copy_attr_times(dir, lower_dir_inode); |
237fead6 MH |
433 | dentry->d_inode->i_nlink = |
434 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; | |
435 | dentry->d_inode->i_ctime = dir->i_ctime; | |
caeeeecf | 436 | d_drop(dentry); |
237fead6 | 437 | out_unlock: |
8dc4e373 | 438 | unlock_dir(lower_dir_dentry); |
237fead6 MH |
439 | return rc; |
440 | } | |
441 | ||
442 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
443 | const char *symname) | |
444 | { | |
445 | int rc; | |
446 | struct dentry *lower_dentry; | |
447 | struct dentry *lower_dir_dentry; | |
448 | umode_t mode; | |
449 | char *encoded_symname; | |
c381bfcf | 450 | int encoded_symlen; |
237fead6 MH |
451 | struct ecryptfs_crypt_stat *crypt_stat = NULL; |
452 | ||
453 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
454 | dget(lower_dentry); | |
455 | lower_dir_dentry = lock_parent(lower_dentry); | |
456 | mode = S_IALLUGO; | |
457 | encoded_symlen = ecryptfs_encode_filename(crypt_stat, symname, | |
458 | strlen(symname), | |
459 | &encoded_symname); | |
460 | if (encoded_symlen < 0) { | |
461 | rc = encoded_symlen; | |
462 | goto out_lock; | |
463 | } | |
464 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, | |
465 | encoded_symname, mode); | |
466 | kfree(encoded_symname); | |
467 | if (rc || !lower_dentry->d_inode) | |
468 | goto out_lock; | |
469 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
470 | if (rc) | |
471 | goto out_lock; | |
0cc72dc7 JJS |
472 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
473 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
474 | out_lock: |
475 | unlock_dir(lower_dir_dentry); | |
476 | dput(lower_dentry); | |
477 | if (!dentry->d_inode) | |
478 | d_drop(dentry); | |
479 | return rc; | |
480 | } | |
481 | ||
482 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
483 | { | |
484 | int rc; | |
485 | struct dentry *lower_dentry; | |
486 | struct dentry *lower_dir_dentry; | |
487 | ||
488 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
489 | lower_dir_dentry = lock_parent(lower_dentry); | |
490 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
491 | if (rc || !lower_dentry->d_inode) | |
492 | goto out; | |
493 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
494 | if (rc) | |
495 | goto out; | |
0cc72dc7 JJS |
496 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
497 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
498 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
499 | out: | |
500 | unlock_dir(lower_dir_dentry); | |
501 | if (!dentry->d_inode) | |
502 | d_drop(dentry); | |
503 | return rc; | |
504 | } | |
505 | ||
506 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
507 | { | |
237fead6 | 508 | struct dentry *lower_dentry; |
237fead6 | 509 | struct dentry *lower_dir_dentry; |
45ec4aba | 510 | int rc; |
237fead6 MH |
511 | |
512 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 513 | dget(dentry); |
237fead6 | 514 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 515 | dget(lower_dentry); |
237fead6 | 516 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba MH |
517 | dput(lower_dentry); |
518 | if (!rc) | |
519 | d_delete(lower_dentry); | |
0cc72dc7 | 520 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
521 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
522 | unlock_dir(lower_dir_dentry); | |
523 | if (!rc) | |
524 | d_drop(dentry); | |
45ec4aba | 525 | dput(dentry); |
237fead6 MH |
526 | return rc; |
527 | } | |
528 | ||
529 | static int | |
530 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
531 | { | |
532 | int rc; | |
533 | struct dentry *lower_dentry; | |
534 | struct dentry *lower_dir_dentry; | |
535 | ||
536 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
537 | lower_dir_dentry = lock_parent(lower_dentry); | |
538 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
539 | if (rc || !lower_dentry->d_inode) | |
540 | goto out; | |
72b55fff MH |
541 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, |
542 | ECRYPTFS_INTERPOSE_FLAG_DELAY_PERSISTENT_FILE); | |
237fead6 MH |
543 | if (rc) |
544 | goto out; | |
0cc72dc7 JJS |
545 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
546 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
547 | out: |
548 | unlock_dir(lower_dir_dentry); | |
549 | if (!dentry->d_inode) | |
550 | d_drop(dentry); | |
551 | return rc; | |
552 | } | |
553 | ||
554 | static int | |
555 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
556 | struct inode *new_dir, struct dentry *new_dentry) | |
557 | { | |
558 | int rc; | |
559 | struct dentry *lower_old_dentry; | |
560 | struct dentry *lower_new_dentry; | |
561 | struct dentry *lower_old_dir_dentry; | |
562 | struct dentry *lower_new_dir_dentry; | |
563 | ||
564 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
565 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
566 | dget(lower_old_dentry); | |
567 | dget(lower_new_dentry); | |
568 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
569 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
570 | lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
571 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, | |
572 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
573 | if (rc) | |
574 | goto out_lock; | |
0cc72dc7 | 575 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode, NULL); |
237fead6 | 576 | if (new_dir != old_dir) |
0cc72dc7 | 577 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode, NULL); |
237fead6 MH |
578 | out_lock: |
579 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
a9083081 MH |
580 | dput(lower_new_dentry->d_parent); |
581 | dput(lower_old_dentry->d_parent); | |
237fead6 MH |
582 | dput(lower_new_dentry); |
583 | dput(lower_old_dentry); | |
584 | return rc; | |
585 | } | |
586 | ||
587 | static int | |
588 | ecryptfs_readlink(struct dentry *dentry, char __user * buf, int bufsiz) | |
589 | { | |
590 | int rc; | |
591 | struct dentry *lower_dentry; | |
592 | char *decoded_name; | |
593 | char *lower_buf; | |
594 | mm_segment_t old_fs; | |
595 | struct ecryptfs_crypt_stat *crypt_stat; | |
596 | ||
597 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
598 | if (!lower_dentry->d_inode->i_op || | |
599 | !lower_dentry->d_inode->i_op->readlink) { | |
600 | rc = -EINVAL; | |
601 | goto out; | |
602 | } | |
603 | /* Released in this function */ | |
604 | lower_buf = kmalloc(bufsiz, GFP_KERNEL); | |
605 | if (lower_buf == NULL) { | |
606 | ecryptfs_printk(KERN_ERR, "Out of memory\n"); | |
607 | rc = -ENOMEM; | |
608 | goto out; | |
609 | } | |
610 | old_fs = get_fs(); | |
611 | set_fs(get_ds()); | |
612 | ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " | |
613 | "lower_dentry->d_name.name = [%s]\n", | |
614 | lower_dentry->d_name.name); | |
615 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, | |
616 | (char __user *)lower_buf, | |
617 | bufsiz); | |
618 | set_fs(old_fs); | |
619 | if (rc >= 0) { | |
620 | crypt_stat = NULL; | |
621 | rc = ecryptfs_decode_filename(crypt_stat, lower_buf, rc, | |
622 | &decoded_name); | |
623 | if (rc == -ENOMEM) | |
624 | goto out_free_lower_buf; | |
625 | if (rc > 0) { | |
626 | ecryptfs_printk(KERN_DEBUG, "Copying [%d] bytes " | |
627 | "to userspace: [%*s]\n", rc, | |
628 | decoded_name); | |
629 | if (copy_to_user(buf, decoded_name, rc)) | |
630 | rc = -EFAULT; | |
631 | } | |
632 | kfree(decoded_name); | |
0cc72dc7 JJS |
633 | fsstack_copy_attr_atime(dentry->d_inode, |
634 | lower_dentry->d_inode); | |
237fead6 MH |
635 | } |
636 | out_free_lower_buf: | |
637 | kfree(lower_buf); | |
638 | out: | |
639 | return rc; | |
640 | } | |
641 | ||
642 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
643 | { | |
644 | char *buf; | |
645 | int len = PAGE_SIZE, rc; | |
646 | mm_segment_t old_fs; | |
647 | ||
648 | /* Released in ecryptfs_put_link(); only release here on error */ | |
649 | buf = kmalloc(len, GFP_KERNEL); | |
650 | if (!buf) { | |
651 | rc = -ENOMEM; | |
652 | goto out; | |
653 | } | |
654 | old_fs = get_fs(); | |
655 | set_fs(get_ds()); | |
656 | ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " | |
657 | "dentry->d_name.name = [%s]\n", dentry->d_name.name); | |
658 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); | |
659 | buf[rc] = '\0'; | |
660 | set_fs(old_fs); | |
661 | if (rc < 0) | |
662 | goto out_free; | |
663 | rc = 0; | |
664 | nd_set_link(nd, buf); | |
665 | goto out; | |
666 | out_free: | |
667 | kfree(buf); | |
668 | out: | |
669 | return ERR_PTR(rc); | |
670 | } | |
671 | ||
672 | static void | |
673 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
674 | { | |
675 | /* Free the char* */ | |
676 | kfree(nd_get_link(nd)); | |
677 | } | |
678 | ||
679 | /** | |
680 | * upper_size_to_lower_size | |
681 | * @crypt_stat: Crypt_stat associated with file | |
682 | * @upper_size: Size of the upper file | |
683 | * | |
cc11beff | 684 | * Calculate the required size of the lower file based on the |
237fead6 MH |
685 | * specified size of the upper file. This calculation is based on the |
686 | * number of headers in the underlying file and the extent size. | |
687 | * | |
688 | * Returns Calculated size of the lower file. | |
689 | */ | |
690 | static loff_t | |
691 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
692 | loff_t upper_size) | |
693 | { | |
694 | loff_t lower_size; | |
695 | ||
cc11beff | 696 | lower_size = crypt_stat->num_header_bytes_at_front; |
237fead6 MH |
697 | if (upper_size != 0) { |
698 | loff_t num_extents; | |
699 | ||
700 | num_extents = upper_size >> crypt_stat->extent_shift; | |
701 | if (upper_size & ~crypt_stat->extent_mask) | |
702 | num_extents++; | |
703 | lower_size += (num_extents * crypt_stat->extent_size); | |
704 | } | |
705 | return lower_size; | |
706 | } | |
707 | ||
708 | /** | |
709 | * ecryptfs_truncate | |
710 | * @dentry: The ecryptfs layer dentry | |
711 | * @new_length: The length to expand the file to | |
712 | * | |
713 | * Function to handle truncations modifying the size of the file. Note | |
714 | * that the file sizes are interpolated. When expanding, we are simply | |
715 | * writing strings of 0's out. When truncating, we need to modify the | |
716 | * underlying file size according to the page index interpolations. | |
717 | * | |
718 | * Returns zero on success; non-zero otherwise | |
719 | */ | |
720 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
721 | { | |
722 | int rc = 0; | |
723 | struct inode *inode = dentry->d_inode; | |
724 | struct dentry *lower_dentry; | |
2ed92554 | 725 | struct file fake_ecryptfs_file; |
237fead6 MH |
726 | struct ecryptfs_crypt_stat *crypt_stat; |
727 | loff_t i_size = i_size_read(inode); | |
728 | loff_t lower_size_before_truncate; | |
729 | loff_t lower_size_after_truncate; | |
730 | ||
731 | if (unlikely((new_length == i_size))) | |
732 | goto out; | |
733 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
734 | /* Set up a fake ecryptfs file, this is used to interface with | |
735 | * the file in the underlying filesystem so that the | |
736 | * truncation has an effect there as well. */ | |
737 | memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file)); | |
bd243a4b | 738 | fake_ecryptfs_file.f_path.dentry = dentry; |
237fead6 MH |
739 | /* Released at out_free: label */ |
740 | ecryptfs_set_file_private(&fake_ecryptfs_file, | |
741 | kmem_cache_alloc(ecryptfs_file_info_cache, | |
e94b1766 | 742 | GFP_KERNEL)); |
237fead6 MH |
743 | if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) { |
744 | rc = -ENOMEM; | |
745 | goto out; | |
746 | } | |
747 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2ed92554 MH |
748 | ecryptfs_set_file_lower( |
749 | &fake_ecryptfs_file, | |
750 | ecryptfs_inode_to_private(dentry->d_inode)->lower_file); | |
237fead6 MH |
751 | /* Switch on growing or shrinking file */ |
752 | if (new_length > i_size) { | |
2ed92554 MH |
753 | char zero[] = { 0x00 }; |
754 | ||
755 | /* Write a single 0 at the last position of the file; | |
756 | * this triggers code that will fill in 0's throughout | |
757 | * the intermediate portion of the previous end of the | |
758 | * file and the new and of the file */ | |
759 | rc = ecryptfs_write(&fake_ecryptfs_file, zero, | |
760 | (new_length - 1), 1); | |
237fead6 | 761 | } else { /* new_length < i_size_read(inode) */ |
2ed92554 MH |
762 | /* We're chopping off all the pages down do the page |
763 | * in which new_length is located. Fill in the end of | |
764 | * that page from (new_length & ~PAGE_CACHE_MASK) to | |
765 | * PAGE_CACHE_SIZE with zeros. */ | |
766 | size_t num_zeros = (PAGE_CACHE_SIZE | |
767 | - (new_length & ~PAGE_CACHE_MASK)); | |
768 | ||
769 | if (num_zeros) { | |
770 | char *zeros_virt; | |
771 | ||
772 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
773 | if (!zeros_virt) { | |
774 | rc = -ENOMEM; | |
775 | goto out_free; | |
776 | } | |
777 | rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt, | |
778 | new_length, num_zeros); | |
779 | kfree(zeros_virt); | |
5dda6992 | 780 | if (rc) { |
240e2df5 MH |
781 | printk(KERN_ERR "Error attempting to zero out " |
782 | "the remainder of the end page on " | |
783 | "reducing truncate; rc = [%d]\n", rc); | |
2ed92554 | 784 | goto out_free; |
240e2df5 MH |
785 | } |
786 | } | |
237fead6 | 787 | vmtruncate(inode, new_length); |
0216f7f7 | 788 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
789 | if (rc) { |
790 | printk(KERN_ERR "Problem with " | |
791 | "ecryptfs_write_inode_size_to_metadata; " | |
792 | "rc = [%d]\n", rc); | |
2ed92554 | 793 | goto out_free; |
dd2a3b7a | 794 | } |
237fead6 MH |
795 | /* We are reducing the size of the ecryptfs file, and need to |
796 | * know if we need to reduce the size of the lower file. */ | |
797 | lower_size_before_truncate = | |
798 | upper_size_to_lower_size(crypt_stat, i_size); | |
799 | lower_size_after_truncate = | |
800 | upper_size_to_lower_size(crypt_stat, new_length); | |
801 | if (lower_size_after_truncate < lower_size_before_truncate) | |
802 | vmtruncate(lower_dentry->d_inode, | |
803 | lower_size_after_truncate); | |
804 | } | |
237fead6 MH |
805 | out_free: |
806 | if (ecryptfs_file_to_private(&fake_ecryptfs_file)) | |
807 | kmem_cache_free(ecryptfs_file_info_cache, | |
808 | ecryptfs_file_to_private(&fake_ecryptfs_file)); | |
809 | out: | |
810 | return rc; | |
811 | } | |
812 | ||
813 | static int | |
814 | ecryptfs_permission(struct inode *inode, int mask, struct nameidata *nd) | |
815 | { | |
816 | int rc; | |
817 | ||
818 | if (nd) { | |
4ac91378 JB |
819 | struct vfsmount *vfsmnt_save = nd->path.mnt; |
820 | struct dentry *dentry_save = nd->path.dentry; | |
237fead6 | 821 | |
4ac91378 JB |
822 | nd->path.mnt = ecryptfs_dentry_to_lower_mnt(nd->path.dentry); |
823 | nd->path.dentry = ecryptfs_dentry_to_lower(nd->path.dentry); | |
237fead6 | 824 | rc = permission(ecryptfs_inode_to_lower(inode), mask, nd); |
4ac91378 JB |
825 | nd->path.mnt = vfsmnt_save; |
826 | nd->path.dentry = dentry_save; | |
237fead6 MH |
827 | } else |
828 | rc = permission(ecryptfs_inode_to_lower(inode), mask, NULL); | |
829 | return rc; | |
830 | } | |
831 | ||
832 | /** | |
833 | * ecryptfs_setattr | |
834 | * @dentry: dentry handle to the inode to modify | |
835 | * @ia: Structure with flags of what to change and values | |
836 | * | |
837 | * Updates the metadata of an inode. If the update is to the size | |
838 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
839 | * of both the ecryptfs inode and the lower inode. | |
840 | * | |
841 | * All other metadata changes will be passed right to the lower filesystem, | |
842 | * and we will just update our inode to look like the lower. | |
843 | */ | |
844 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
845 | { | |
846 | int rc = 0; | |
847 | struct dentry *lower_dentry; | |
848 | struct inode *inode; | |
849 | struct inode *lower_inode; | |
850 | struct ecryptfs_crypt_stat *crypt_stat; | |
851 | ||
852 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
853 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
854 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
855 | inode = dentry->d_inode; |
856 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
857 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
858 | mutex_lock(&crypt_stat->cs_mutex); | |
859 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
860 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
861 | else if (S_ISREG(dentry->d_inode->i_mode) |
862 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
863 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 864 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 865 | |
e10f281b MH |
866 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
867 | dentry->d_sb)->mount_crypt_stat; | |
d7cdc5fe | 868 | rc = ecryptfs_read_metadata(dentry); |
5dda6992 | 869 | if (rc) { |
e10f281b MH |
870 | if (!(mount_crypt_stat->flags |
871 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
872 | rc = -EIO; | |
25bd8174 | 873 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 874 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
875 | "or the key could not be retrieved. " |
876 | "Plaintext passthrough mode is not " | |
e10f281b | 877 | "enabled; returning -EIO\n"); |
e10f281b | 878 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
879 | goto out; |
880 | } | |
881 | rc = 0; | |
882 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
883 | mutex_unlock(&crypt_stat->cs_mutex); | |
e10f281b MH |
884 | goto out; |
885 | } | |
e10f281b MH |
886 | } |
887 | mutex_unlock(&crypt_stat->cs_mutex); | |
237fead6 MH |
888 | if (ia->ia_valid & ATTR_SIZE) { |
889 | ecryptfs_printk(KERN_DEBUG, | |
890 | "ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n", | |
891 | ia->ia_valid, ATTR_SIZE); | |
892 | rc = ecryptfs_truncate(dentry, ia->ia_size); | |
893 | /* ecryptfs_truncate handles resizing of the lower file */ | |
894 | ia->ia_valid &= ~ATTR_SIZE; | |
895 | ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [%x]\n", | |
896 | ia->ia_valid); | |
897 | if (rc < 0) | |
898 | goto out; | |
899 | } | |
1ac564ec JL |
900 | |
901 | /* | |
902 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
903 | * to interpret this in its own way. | |
904 | */ | |
905 | if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) | |
906 | ia->ia_valid &= ~ATTR_MODE; | |
907 | ||
9c3580aa | 908 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
237fead6 | 909 | rc = notify_change(lower_dentry, ia); |
9c3580aa | 910 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
237fead6 | 911 | out: |
0cc72dc7 | 912 | fsstack_copy_attr_all(inode, lower_inode, NULL); |
237fead6 MH |
913 | return rc; |
914 | } | |
915 | ||
dd2a3b7a | 916 | int |
237fead6 MH |
917 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
918 | size_t size, int flags) | |
919 | { | |
920 | int rc = 0; | |
921 | struct dentry *lower_dentry; | |
922 | ||
923 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
924 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
925 | rc = -ENOSYS; | |
926 | goto out; | |
927 | } | |
928 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
929 | rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, | |
930 | size, flags); | |
931 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
932 | out: | |
933 | return rc; | |
934 | } | |
935 | ||
d7cdc5fe MH |
936 | ssize_t |
937 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
938 | void *value, size_t size) | |
939 | { | |
940 | int rc = 0; | |
941 | ||
942 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
943 | rc = -ENOSYS; | |
944 | goto out; | |
945 | } | |
946 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
947 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
948 | size); | |
949 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
950 | out: | |
951 | return rc; | |
952 | } | |
953 | ||
7896b631 | 954 | static ssize_t |
237fead6 MH |
955 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
956 | size_t size) | |
957 | { | |
2ed92554 MH |
958 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
959 | value, size); | |
237fead6 MH |
960 | } |
961 | ||
962 | static ssize_t | |
963 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
964 | { | |
965 | int rc = 0; | |
966 | struct dentry *lower_dentry; | |
967 | ||
968 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
969 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
970 | rc = -ENOSYS; | |
971 | goto out; | |
972 | } | |
973 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
974 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
975 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
976 | out: | |
977 | return rc; | |
978 | } | |
979 | ||
980 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
981 | { | |
982 | int rc = 0; | |
983 | struct dentry *lower_dentry; | |
984 | ||
985 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
986 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
987 | rc = -ENOSYS; | |
988 | goto out; | |
989 | } | |
990 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
991 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
992 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
993 | out: | |
994 | return rc; | |
995 | } | |
996 | ||
997 | int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) | |
998 | { | |
999 | if ((ecryptfs_inode_to_lower(inode) | |
1000 | == (struct inode *)candidate_lower_inode)) | |
1001 | return 1; | |
1002 | else | |
1003 | return 0; | |
1004 | } | |
1005 | ||
1006 | int ecryptfs_inode_set(struct inode *inode, void *lower_inode) | |
1007 | { | |
1008 | ecryptfs_init_inode(inode, (struct inode *)lower_inode); | |
1009 | return 0; | |
1010 | } | |
1011 | ||
754661f1 | 1012 | const struct inode_operations ecryptfs_symlink_iops = { |
237fead6 MH |
1013 | .readlink = ecryptfs_readlink, |
1014 | .follow_link = ecryptfs_follow_link, | |
1015 | .put_link = ecryptfs_put_link, | |
1016 | .permission = ecryptfs_permission, | |
1017 | .setattr = ecryptfs_setattr, | |
1018 | .setxattr = ecryptfs_setxattr, | |
1019 | .getxattr = ecryptfs_getxattr, | |
1020 | .listxattr = ecryptfs_listxattr, | |
1021 | .removexattr = ecryptfs_removexattr | |
1022 | }; | |
1023 | ||
754661f1 | 1024 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1025 | .create = ecryptfs_create, |
1026 | .lookup = ecryptfs_lookup, | |
1027 | .link = ecryptfs_link, | |
1028 | .unlink = ecryptfs_unlink, | |
1029 | .symlink = ecryptfs_symlink, | |
1030 | .mkdir = ecryptfs_mkdir, | |
1031 | .rmdir = ecryptfs_rmdir, | |
1032 | .mknod = ecryptfs_mknod, | |
1033 | .rename = ecryptfs_rename, | |
1034 | .permission = ecryptfs_permission, | |
1035 | .setattr = ecryptfs_setattr, | |
1036 | .setxattr = ecryptfs_setxattr, | |
1037 | .getxattr = ecryptfs_getxattr, | |
1038 | .listxattr = ecryptfs_listxattr, | |
1039 | .removexattr = ecryptfs_removexattr | |
1040 | }; | |
1041 | ||
754661f1 | 1042 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1043 | .permission = ecryptfs_permission, |
1044 | .setattr = ecryptfs_setattr, | |
1045 | .setxattr = ecryptfs_setxattr, | |
1046 | .getxattr = ecryptfs_getxattr, | |
1047 | .listxattr = ecryptfs_listxattr, | |
1048 | .removexattr = ecryptfs_removexattr | |
1049 | }; |