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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> |
237fead6 MH |
34 | #include "ecryptfs_kernel.h" |
35 | ||
36 | static struct dentry *lock_parent(struct dentry *dentry) | |
37 | { | |
38 | struct dentry *dir; | |
39 | ||
40 | dir = dget(dentry->d_parent); | |
41 | mutex_lock(&(dir->d_inode->i_mutex)); | |
42 | return dir; | |
43 | } | |
44 | ||
45 | static void unlock_parent(struct dentry *dentry) | |
46 | { | |
47 | mutex_unlock(&(dentry->d_parent->d_inode->i_mutex)); | |
48 | dput(dentry->d_parent); | |
49 | } | |
50 | ||
51 | static void unlock_dir(struct dentry *dir) | |
52 | { | |
53 | mutex_unlock(&dir->d_inode->i_mutex); | |
54 | dput(dir); | |
55 | } | |
56 | ||
237fead6 MH |
57 | /** |
58 | * ecryptfs_create_underlying_file | |
59 | * @lower_dir_inode: inode of the parent in the lower fs of the new file | |
60 | * @lower_dentry: New file's dentry in the lower fs | |
61 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
62 | * @mode: The mode of the new file | |
63 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
64 | * | |
65 | * Creates the file in the lower file system. | |
66 | * | |
67 | * Returns zero on success; non-zero on error condition | |
68 | */ | |
69 | static int | |
70 | ecryptfs_create_underlying_file(struct inode *lower_dir_inode, | |
71 | struct dentry *dentry, int mode, | |
72 | struct nameidata *nd) | |
73 | { | |
74 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
75 | struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); | |
76 | struct dentry *dentry_save; | |
77 | struct vfsmount *vfsmount_save; | |
78 | int rc; | |
79 | ||
80 | dentry_save = nd->dentry; | |
81 | vfsmount_save = nd->mnt; | |
82 | nd->dentry = lower_dentry; | |
83 | nd->mnt = lower_mnt; | |
84 | rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); | |
85 | nd->dentry = dentry_save; | |
86 | nd->mnt = vfsmount_save; | |
87 | return rc; | |
88 | } | |
89 | ||
90 | /** | |
91 | * ecryptfs_do_create | |
92 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
93 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
94 | * @mode: The mode of the new file | |
95 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
96 | * | |
97 | * Creates the underlying file and the eCryptfs inode which will link to | |
98 | * it. It will also update the eCryptfs directory inode to mimic the | |
99 | * stat of the lower directory inode. | |
100 | * | |
101 | * Returns zero on success; non-zero on error condition | |
102 | */ | |
103 | static int | |
104 | ecryptfs_do_create(struct inode *directory_inode, | |
105 | struct dentry *ecryptfs_dentry, int mode, | |
106 | struct nameidata *nd) | |
107 | { | |
108 | int rc; | |
109 | struct dentry *lower_dentry; | |
110 | struct dentry *lower_dir_dentry; | |
111 | ||
112 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
113 | lower_dir_dentry = lock_parent(lower_dentry); | |
114 | if (unlikely(IS_ERR(lower_dir_dentry))) { | |
115 | ecryptfs_printk(KERN_ERR, "Error locking directory of " | |
116 | "dentry\n"); | |
117 | rc = PTR_ERR(lower_dir_dentry); | |
118 | goto out; | |
119 | } | |
120 | rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, | |
121 | ecryptfs_dentry, mode, nd); | |
122 | if (unlikely(rc)) { | |
123 | ecryptfs_printk(KERN_ERR, | |
124 | "Failure to create underlying file\n"); | |
125 | goto out_lock; | |
126 | } | |
127 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, | |
128 | directory_inode->i_sb, 0); | |
129 | if (rc) { | |
130 | ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); | |
131 | goto out_lock; | |
132 | } | |
0cc72dc7 JJS |
133 | fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); |
134 | fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); | |
237fead6 MH |
135 | out_lock: |
136 | unlock_dir(lower_dir_dentry); | |
137 | out: | |
138 | return rc; | |
139 | } | |
140 | ||
141 | /** | |
142 | * grow_file | |
143 | * @ecryptfs_dentry: the ecryptfs dentry | |
144 | * @lower_file: The lower file | |
145 | * @inode: The ecryptfs inode | |
146 | * @lower_inode: The lower inode | |
147 | * | |
148 | * This is the code which will grow the file to its correct size. | |
149 | */ | |
150 | static int grow_file(struct dentry *ecryptfs_dentry, struct file *lower_file, | |
151 | struct inode *inode, struct inode *lower_inode) | |
152 | { | |
153 | int rc = 0; | |
154 | struct file fake_file; | |
155 | struct ecryptfs_file_info tmp_file_info; | |
156 | ||
157 | memset(&fake_file, 0, sizeof(fake_file)); | |
bd243a4b | 158 | fake_file.f_path.dentry = ecryptfs_dentry; |
237fead6 MH |
159 | memset(&tmp_file_info, 0, sizeof(tmp_file_info)); |
160 | ecryptfs_set_file_private(&fake_file, &tmp_file_info); | |
161 | ecryptfs_set_file_lower(&fake_file, lower_file); | |
162 | rc = ecryptfs_fill_zeros(&fake_file, 1); | |
163 | if (rc) { | |
164 | ECRYPTFS_SET_FLAG( | |
165 | ecryptfs_inode_to_private(inode)->crypt_stat.flags, | |
166 | ECRYPTFS_SECURITY_WARNING); | |
167 | ecryptfs_printk(KERN_WARNING, "Error attempting to fill zeros " | |
168 | "in file; rc = [%d]\n", rc); | |
169 | goto out; | |
170 | } | |
171 | i_size_write(inode, 0); | |
dd2a3b7a MH |
172 | ecryptfs_write_inode_size_to_metadata(lower_file, lower_inode, inode, |
173 | ecryptfs_dentry, | |
174 | ECRYPTFS_LOWER_I_MUTEX_NOT_HELD); | |
237fead6 MH |
175 | ECRYPTFS_SET_FLAG(ecryptfs_inode_to_private(inode)->crypt_stat.flags, |
176 | ECRYPTFS_NEW_FILE); | |
177 | out: | |
178 | return rc; | |
179 | } | |
180 | ||
181 | /** | |
182 | * ecryptfs_initialize_file | |
183 | * | |
184 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
185 | * file with a header and first data page. | |
186 | * | |
187 | * Returns zero on success | |
188 | */ | |
189 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) | |
190 | { | |
191 | int rc = 0; | |
192 | int lower_flags; | |
193 | struct ecryptfs_crypt_stat *crypt_stat; | |
194 | struct dentry *lower_dentry; | |
237fead6 MH |
195 | struct file *lower_file; |
196 | struct inode *inode, *lower_inode; | |
197 | struct vfsmount *lower_mnt; | |
198 | ||
199 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
200 | ecryptfs_printk(KERN_DEBUG, "lower_dentry->d_name.name = [%s]\n", | |
201 | lower_dentry->d_name.name); | |
202 | inode = ecryptfs_dentry->d_inode; | |
203 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
70456600 | 204 | lower_flags = ((O_CREAT | O_TRUNC) & O_ACCMODE) | O_RDWR; |
237fead6 MH |
205 | #if BITS_PER_LONG != 32 |
206 | lower_flags |= O_LARGEFILE; | |
207 | #endif | |
208 | lower_mnt = ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry); | |
237fead6 | 209 | /* Corresponding fput() at end of this function */ |
7ff1d74f MH |
210 | if ((rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt, |
211 | lower_flags))) { | |
237fead6 MH |
212 | ecryptfs_printk(KERN_ERR, |
213 | "Error opening dentry; rc = [%i]\n", rc); | |
214 | goto out; | |
215 | } | |
7ff1d74f | 216 | lower_inode = lower_dentry->d_inode; |
237fead6 MH |
217 | if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { |
218 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); | |
219 | ECRYPTFS_CLEAR_FLAG(crypt_stat->flags, ECRYPTFS_ENCRYPTED); | |
220 | goto out_fput; | |
221 | } | |
222 | ECRYPTFS_SET_FLAG(crypt_stat->flags, ECRYPTFS_NEW_FILE); | |
223 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); | |
224 | rc = ecryptfs_new_file_context(ecryptfs_dentry); | |
225 | if (rc) { | |
226 | ecryptfs_printk(KERN_DEBUG, "Error creating new file " | |
227 | "context\n"); | |
228 | goto out_fput; | |
229 | } | |
dd2a3b7a | 230 | rc = ecryptfs_write_metadata(ecryptfs_dentry, lower_file); |
237fead6 MH |
231 | if (rc) { |
232 | ecryptfs_printk(KERN_DEBUG, "Error writing headers\n"); | |
233 | goto out_fput; | |
234 | } | |
235 | rc = grow_file(ecryptfs_dentry, lower_file, inode, lower_inode); | |
236 | out_fput: | |
7ff1d74f MH |
237 | if ((rc = ecryptfs_close_lower_file(lower_file))) |
238 | printk(KERN_ERR "Error closing lower_file\n"); | |
237fead6 MH |
239 | out: |
240 | return rc; | |
241 | } | |
242 | ||
243 | /** | |
244 | * ecryptfs_create | |
245 | * @dir: The inode of the directory in which to create the file. | |
246 | * @dentry: The eCryptfs dentry | |
247 | * @mode: The mode of the new file. | |
248 | * @nd: nameidata | |
249 | * | |
250 | * Creates a new file. | |
251 | * | |
252 | * Returns zero on success; non-zero on error condition | |
253 | */ | |
254 | static int | |
255 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
256 | int mode, struct nameidata *nd) | |
257 | { | |
258 | int rc; | |
259 | ||
260 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); | |
261 | if (unlikely(rc)) { | |
262 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" | |
263 | "lower filesystem\n"); | |
264 | goto out; | |
265 | } | |
266 | /* At this point, a file exists on "disk"; we need to make sure | |
267 | * that this on disk file is prepared to be an ecryptfs file */ | |
268 | rc = ecryptfs_initialize_file(ecryptfs_dentry); | |
269 | out: | |
270 | return rc; | |
271 | } | |
272 | ||
273 | /** | |
274 | * ecryptfs_lookup | |
275 | * @dir: inode | |
276 | * @dentry: The dentry | |
277 | * @nd: nameidata, may be NULL | |
278 | * | |
279 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
280 | * dentry cache and continue on to read it from the disk. | |
281 | */ | |
282 | static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, | |
283 | struct nameidata *nd) | |
284 | { | |
285 | int rc = 0; | |
286 | struct dentry *lower_dir_dentry; | |
287 | struct dentry *lower_dentry; | |
288 | struct vfsmount *lower_mnt; | |
237fead6 MH |
289 | char *encoded_name; |
290 | unsigned int encoded_namelen; | |
291 | struct ecryptfs_crypt_stat *crypt_stat = NULL; | |
e77a56dd | 292 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
237fead6 MH |
293 | char *page_virt = NULL; |
294 | struct inode *lower_inode; | |
295 | u64 file_size; | |
296 | ||
297 | lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); | |
298 | dentry->d_op = &ecryptfs_dops; | |
299 | if ((dentry->d_name.len == 1 && !strcmp(dentry->d_name.name, ".")) | |
45ec4aba MH |
300 | || (dentry->d_name.len == 2 |
301 | && !strcmp(dentry->d_name.name, ".."))) { | |
302 | d_drop(dentry); | |
303 | goto out; | |
304 | } | |
237fead6 MH |
305 | encoded_namelen = ecryptfs_encode_filename(crypt_stat, |
306 | dentry->d_name.name, | |
307 | dentry->d_name.len, | |
308 | &encoded_name); | |
309 | if (encoded_namelen < 0) { | |
310 | rc = encoded_namelen; | |
45ec4aba MH |
311 | d_drop(dentry); |
312 | goto out; | |
237fead6 MH |
313 | } |
314 | ecryptfs_printk(KERN_DEBUG, "encoded_name = [%s]; encoded_namelen " | |
315 | "= [%d]\n", encoded_name, encoded_namelen); | |
316 | lower_dentry = lookup_one_len(encoded_name, lower_dir_dentry, | |
317 | encoded_namelen - 1); | |
318 | kfree(encoded_name); | |
237fead6 MH |
319 | if (IS_ERR(lower_dentry)) { |
320 | ecryptfs_printk(KERN_ERR, "ERR from lower_dentry\n"); | |
321 | rc = PTR_ERR(lower_dentry); | |
45ec4aba MH |
322 | d_drop(dentry); |
323 | goto out; | |
237fead6 | 324 | } |
45ec4aba | 325 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); |
237fead6 MH |
326 | ecryptfs_printk(KERN_DEBUG, "lower_dentry = [%p]; lower_dentry->" |
327 | "d_name.name = [%s]\n", lower_dentry, | |
328 | lower_dentry->d_name.name); | |
329 | lower_inode = lower_dentry->d_inode; | |
0cc72dc7 | 330 | fsstack_copy_attr_atime(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
331 | BUG_ON(!atomic_read(&lower_dentry->d_count)); |
332 | ecryptfs_set_dentry_private(dentry, | |
333 | kmem_cache_alloc(ecryptfs_dentry_info_cache, | |
e94b1766 | 334 | GFP_KERNEL)); |
237fead6 MH |
335 | if (!ecryptfs_dentry_to_private(dentry)) { |
336 | rc = -ENOMEM; | |
337 | ecryptfs_printk(KERN_ERR, "Out of memory whilst attempting " | |
338 | "to allocate ecryptfs_dentry_info struct\n"); | |
339 | goto out_dput; | |
340 | } | |
341 | ecryptfs_set_dentry_lower(dentry, lower_dentry); | |
342 | ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); | |
343 | if (!lower_dentry->d_inode) { | |
344 | /* We want to add because we couldn't find in lower */ | |
345 | d_add(dentry, NULL); | |
346 | goto out; | |
347 | } | |
348 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 1); | |
349 | if (rc) { | |
350 | ecryptfs_printk(KERN_ERR, "Error interposing\n"); | |
351 | goto out_dput; | |
352 | } | |
353 | if (S_ISDIR(lower_inode->i_mode)) { | |
354 | ecryptfs_printk(KERN_DEBUG, "Is a directory; returning\n"); | |
355 | goto out; | |
356 | } | |
357 | if (S_ISLNK(lower_inode->i_mode)) { | |
358 | ecryptfs_printk(KERN_DEBUG, "Is a symlink; returning\n"); | |
359 | goto out; | |
360 | } | |
361 | if (!nd) { | |
362 | ecryptfs_printk(KERN_DEBUG, "We have a NULL nd, just leave" | |
363 | "as we *think* we are about to unlink\n"); | |
364 | goto out; | |
365 | } | |
237fead6 | 366 | /* Released in this function */ |
c3762229 | 367 | page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, |
dd2a3b7a | 368 | GFP_USER); |
237fead6 MH |
369 | if (!page_virt) { |
370 | rc = -ENOMEM; | |
371 | ecryptfs_printk(KERN_ERR, | |
372 | "Cannot ecryptfs_kmalloc a page\n"); | |
373 | goto out_dput; | |
374 | } | |
237fead6 MH |
375 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
376 | if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_POLICY_APPLIED)) | |
377 | ecryptfs_set_default_sizes(crypt_stat); | |
dd2a3b7a MH |
378 | rc = ecryptfs_read_and_validate_header_region(page_virt, lower_dentry, |
379 | nd->mnt); | |
237fead6 | 380 | if (rc) { |
dd2a3b7a MH |
381 | rc = ecryptfs_read_and_validate_xattr_region(page_virt, dentry); |
382 | if (rc) { | |
383 | printk(KERN_DEBUG "Valid metadata not found in header " | |
384 | "region or xattr region; treating file as " | |
385 | "unencrypted\n"); | |
386 | rc = 0; | |
237fead6 MH |
387 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
388 | goto out; | |
389 | } | |
dd2a3b7a | 390 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
237fead6 | 391 | } |
e77a56dd MH |
392 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
393 | dentry->d_sb)->mount_crypt_stat; | |
394 | if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { | |
395 | if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) | |
396 | file_size = (crypt_stat->header_extent_size | |
397 | + i_size_read(lower_dentry->d_inode)); | |
398 | else | |
399 | file_size = i_size_read(lower_dentry->d_inode); | |
400 | } else { | |
401 | memcpy(&file_size, page_virt, sizeof(file_size)); | |
402 | file_size = be64_to_cpu(file_size); | |
403 | } | |
dd2a3b7a | 404 | i_size_write(dentry->d_inode, (loff_t)file_size); |
237fead6 MH |
405 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
406 | goto out; | |
407 | ||
408 | out_dput: | |
409 | dput(lower_dentry); | |
237fead6 MH |
410 | d_drop(dentry); |
411 | out: | |
412 | return ERR_PTR(rc); | |
413 | } | |
414 | ||
415 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
416 | struct dentry *new_dentry) | |
417 | { | |
418 | struct dentry *lower_old_dentry; | |
419 | struct dentry *lower_new_dentry; | |
420 | struct dentry *lower_dir_dentry; | |
421 | u64 file_size_save; | |
422 | int rc; | |
423 | ||
424 | file_size_save = i_size_read(old_dentry->d_inode); | |
425 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
426 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
427 | dget(lower_old_dentry); | |
428 | dget(lower_new_dentry); | |
429 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
430 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
431 | lower_new_dentry); | |
432 | if (rc || !lower_new_dentry->d_inode) | |
433 | goto out_lock; | |
434 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); | |
435 | if (rc) | |
436 | goto out_lock; | |
0cc72dc7 JJS |
437 | fsstack_copy_attr_times(dir, lower_new_dentry->d_inode); |
438 | fsstack_copy_inode_size(dir, lower_new_dentry->d_inode); | |
237fead6 MH |
439 | old_dentry->d_inode->i_nlink = |
440 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; | |
441 | i_size_write(new_dentry->d_inode, file_size_save); | |
442 | out_lock: | |
443 | unlock_dir(lower_dir_dentry); | |
444 | dput(lower_new_dentry); | |
445 | dput(lower_old_dentry); | |
ae56fb16 | 446 | d_drop(lower_old_dentry); |
45ec4aba MH |
447 | d_drop(new_dentry); |
448 | d_drop(old_dentry); | |
237fead6 MH |
449 | return rc; |
450 | } | |
451 | ||
452 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
453 | { | |
454 | int rc = 0; | |
455 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
456 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
457 | ||
458 | lock_parent(lower_dentry); | |
459 | rc = vfs_unlink(lower_dir_inode, lower_dentry); | |
460 | if (rc) { | |
ae56fb16 | 461 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
462 | goto out_unlock; |
463 | } | |
0cc72dc7 | 464 | fsstack_copy_attr_times(dir, lower_dir_inode); |
237fead6 MH |
465 | dentry->d_inode->i_nlink = |
466 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; | |
467 | dentry->d_inode->i_ctime = dir->i_ctime; | |
468 | out_unlock: | |
469 | unlock_parent(lower_dentry); | |
470 | return rc; | |
471 | } | |
472 | ||
473 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
474 | const char *symname) | |
475 | { | |
476 | int rc; | |
477 | struct dentry *lower_dentry; | |
478 | struct dentry *lower_dir_dentry; | |
479 | umode_t mode; | |
480 | char *encoded_symname; | |
481 | unsigned int encoded_symlen; | |
482 | struct ecryptfs_crypt_stat *crypt_stat = NULL; | |
483 | ||
484 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
485 | dget(lower_dentry); | |
486 | lower_dir_dentry = lock_parent(lower_dentry); | |
487 | mode = S_IALLUGO; | |
488 | encoded_symlen = ecryptfs_encode_filename(crypt_stat, symname, | |
489 | strlen(symname), | |
490 | &encoded_symname); | |
491 | if (encoded_symlen < 0) { | |
492 | rc = encoded_symlen; | |
493 | goto out_lock; | |
494 | } | |
495 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, | |
496 | encoded_symname, mode); | |
497 | kfree(encoded_symname); | |
498 | if (rc || !lower_dentry->d_inode) | |
499 | goto out_lock; | |
500 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
501 | if (rc) | |
502 | goto out_lock; | |
0cc72dc7 JJS |
503 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
504 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
505 | out_lock: |
506 | unlock_dir(lower_dir_dentry); | |
507 | dput(lower_dentry); | |
508 | if (!dentry->d_inode) | |
509 | d_drop(dentry); | |
510 | return rc; | |
511 | } | |
512 | ||
513 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
514 | { | |
515 | int rc; | |
516 | struct dentry *lower_dentry; | |
517 | struct dentry *lower_dir_dentry; | |
518 | ||
519 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
520 | lower_dir_dentry = lock_parent(lower_dentry); | |
521 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
522 | if (rc || !lower_dentry->d_inode) | |
523 | goto out; | |
524 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
525 | if (rc) | |
526 | goto out; | |
0cc72dc7 JJS |
527 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
528 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
529 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
530 | out: | |
531 | unlock_dir(lower_dir_dentry); | |
532 | if (!dentry->d_inode) | |
533 | d_drop(dentry); | |
534 | return rc; | |
535 | } | |
536 | ||
537 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
538 | { | |
237fead6 | 539 | struct dentry *lower_dentry; |
237fead6 | 540 | struct dentry *lower_dir_dentry; |
45ec4aba | 541 | int rc; |
237fead6 MH |
542 | |
543 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 544 | dget(dentry); |
237fead6 | 545 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 546 | dget(lower_dentry); |
237fead6 | 547 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba MH |
548 | dput(lower_dentry); |
549 | if (!rc) | |
550 | d_delete(lower_dentry); | |
0cc72dc7 | 551 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
552 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
553 | unlock_dir(lower_dir_dentry); | |
554 | if (!rc) | |
555 | d_drop(dentry); | |
45ec4aba | 556 | dput(dentry); |
237fead6 MH |
557 | return rc; |
558 | } | |
559 | ||
560 | static int | |
561 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
562 | { | |
563 | int rc; | |
564 | struct dentry *lower_dentry; | |
565 | struct dentry *lower_dir_dentry; | |
566 | ||
567 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
568 | lower_dir_dentry = lock_parent(lower_dentry); | |
569 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
570 | if (rc || !lower_dentry->d_inode) | |
571 | goto out; | |
572 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
573 | if (rc) | |
574 | goto out; | |
0cc72dc7 JJS |
575 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
576 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
577 | out: |
578 | unlock_dir(lower_dir_dentry); | |
579 | if (!dentry->d_inode) | |
580 | d_drop(dentry); | |
581 | return rc; | |
582 | } | |
583 | ||
584 | static int | |
585 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
586 | struct inode *new_dir, struct dentry *new_dentry) | |
587 | { | |
588 | int rc; | |
589 | struct dentry *lower_old_dentry; | |
590 | struct dentry *lower_new_dentry; | |
591 | struct dentry *lower_old_dir_dentry; | |
592 | struct dentry *lower_new_dir_dentry; | |
593 | ||
594 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
595 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
596 | dget(lower_old_dentry); | |
597 | dget(lower_new_dentry); | |
598 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
599 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
600 | lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
601 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, | |
602 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
603 | if (rc) | |
604 | goto out_lock; | |
0cc72dc7 | 605 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode, NULL); |
237fead6 | 606 | if (new_dir != old_dir) |
0cc72dc7 | 607 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode, NULL); |
237fead6 MH |
608 | out_lock: |
609 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
a9083081 MH |
610 | dput(lower_new_dentry->d_parent); |
611 | dput(lower_old_dentry->d_parent); | |
237fead6 MH |
612 | dput(lower_new_dentry); |
613 | dput(lower_old_dentry); | |
614 | return rc; | |
615 | } | |
616 | ||
617 | static int | |
618 | ecryptfs_readlink(struct dentry *dentry, char __user * buf, int bufsiz) | |
619 | { | |
620 | int rc; | |
621 | struct dentry *lower_dentry; | |
622 | char *decoded_name; | |
623 | char *lower_buf; | |
624 | mm_segment_t old_fs; | |
625 | struct ecryptfs_crypt_stat *crypt_stat; | |
626 | ||
627 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
628 | if (!lower_dentry->d_inode->i_op || | |
629 | !lower_dentry->d_inode->i_op->readlink) { | |
630 | rc = -EINVAL; | |
631 | goto out; | |
632 | } | |
633 | /* Released in this function */ | |
634 | lower_buf = kmalloc(bufsiz, GFP_KERNEL); | |
635 | if (lower_buf == NULL) { | |
636 | ecryptfs_printk(KERN_ERR, "Out of memory\n"); | |
637 | rc = -ENOMEM; | |
638 | goto out; | |
639 | } | |
640 | old_fs = get_fs(); | |
641 | set_fs(get_ds()); | |
642 | ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " | |
643 | "lower_dentry->d_name.name = [%s]\n", | |
644 | lower_dentry->d_name.name); | |
645 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, | |
646 | (char __user *)lower_buf, | |
647 | bufsiz); | |
648 | set_fs(old_fs); | |
649 | if (rc >= 0) { | |
650 | crypt_stat = NULL; | |
651 | rc = ecryptfs_decode_filename(crypt_stat, lower_buf, rc, | |
652 | &decoded_name); | |
653 | if (rc == -ENOMEM) | |
654 | goto out_free_lower_buf; | |
655 | if (rc > 0) { | |
656 | ecryptfs_printk(KERN_DEBUG, "Copying [%d] bytes " | |
657 | "to userspace: [%*s]\n", rc, | |
658 | decoded_name); | |
659 | if (copy_to_user(buf, decoded_name, rc)) | |
660 | rc = -EFAULT; | |
661 | } | |
662 | kfree(decoded_name); | |
0cc72dc7 JJS |
663 | fsstack_copy_attr_atime(dentry->d_inode, |
664 | lower_dentry->d_inode); | |
237fead6 MH |
665 | } |
666 | out_free_lower_buf: | |
667 | kfree(lower_buf); | |
668 | out: | |
669 | return rc; | |
670 | } | |
671 | ||
672 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
673 | { | |
674 | char *buf; | |
675 | int len = PAGE_SIZE, rc; | |
676 | mm_segment_t old_fs; | |
677 | ||
678 | /* Released in ecryptfs_put_link(); only release here on error */ | |
679 | buf = kmalloc(len, GFP_KERNEL); | |
680 | if (!buf) { | |
681 | rc = -ENOMEM; | |
682 | goto out; | |
683 | } | |
684 | old_fs = get_fs(); | |
685 | set_fs(get_ds()); | |
686 | ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " | |
687 | "dentry->d_name.name = [%s]\n", dentry->d_name.name); | |
688 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); | |
689 | buf[rc] = '\0'; | |
690 | set_fs(old_fs); | |
691 | if (rc < 0) | |
692 | goto out_free; | |
693 | rc = 0; | |
694 | nd_set_link(nd, buf); | |
695 | goto out; | |
696 | out_free: | |
697 | kfree(buf); | |
698 | out: | |
699 | return ERR_PTR(rc); | |
700 | } | |
701 | ||
702 | static void | |
703 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
704 | { | |
705 | /* Free the char* */ | |
706 | kfree(nd_get_link(nd)); | |
707 | } | |
708 | ||
709 | /** | |
710 | * upper_size_to_lower_size | |
711 | * @crypt_stat: Crypt_stat associated with file | |
712 | * @upper_size: Size of the upper file | |
713 | * | |
714 | * Calculate the requried size of the lower file based on the | |
715 | * specified size of the upper file. This calculation is based on the | |
716 | * number of headers in the underlying file and the extent size. | |
717 | * | |
718 | * Returns Calculated size of the lower file. | |
719 | */ | |
720 | static loff_t | |
721 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
722 | loff_t upper_size) | |
723 | { | |
724 | loff_t lower_size; | |
725 | ||
726 | lower_size = ( crypt_stat->header_extent_size | |
727 | * crypt_stat->num_header_extents_at_front ); | |
728 | if (upper_size != 0) { | |
729 | loff_t num_extents; | |
730 | ||
731 | num_extents = upper_size >> crypt_stat->extent_shift; | |
732 | if (upper_size & ~crypt_stat->extent_mask) | |
733 | num_extents++; | |
734 | lower_size += (num_extents * crypt_stat->extent_size); | |
735 | } | |
736 | return lower_size; | |
737 | } | |
738 | ||
739 | /** | |
740 | * ecryptfs_truncate | |
741 | * @dentry: The ecryptfs layer dentry | |
742 | * @new_length: The length to expand the file to | |
743 | * | |
744 | * Function to handle truncations modifying the size of the file. Note | |
745 | * that the file sizes are interpolated. When expanding, we are simply | |
746 | * writing strings of 0's out. When truncating, we need to modify the | |
747 | * underlying file size according to the page index interpolations. | |
748 | * | |
749 | * Returns zero on success; non-zero otherwise | |
750 | */ | |
751 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
752 | { | |
753 | int rc = 0; | |
754 | struct inode *inode = dentry->d_inode; | |
755 | struct dentry *lower_dentry; | |
756 | struct vfsmount *lower_mnt; | |
757 | struct file fake_ecryptfs_file, *lower_file = NULL; | |
758 | struct ecryptfs_crypt_stat *crypt_stat; | |
759 | loff_t i_size = i_size_read(inode); | |
760 | loff_t lower_size_before_truncate; | |
761 | loff_t lower_size_after_truncate; | |
762 | ||
763 | if (unlikely((new_length == i_size))) | |
764 | goto out; | |
765 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
766 | /* Set up a fake ecryptfs file, this is used to interface with | |
767 | * the file in the underlying filesystem so that the | |
768 | * truncation has an effect there as well. */ | |
769 | memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file)); | |
bd243a4b | 770 | fake_ecryptfs_file.f_path.dentry = dentry; |
237fead6 MH |
771 | /* Released at out_free: label */ |
772 | ecryptfs_set_file_private(&fake_ecryptfs_file, | |
773 | kmem_cache_alloc(ecryptfs_file_info_cache, | |
e94b1766 | 774 | GFP_KERNEL)); |
237fead6 MH |
775 | if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) { |
776 | rc = -ENOMEM; | |
777 | goto out; | |
778 | } | |
779 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
780 | /* This dget & mntget is released through fput at out_fput: */ | |
237fead6 | 781 | lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); |
7ff1d74f MH |
782 | if ((rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt, |
783 | O_RDWR))) { | |
784 | ecryptfs_printk(KERN_ERR, | |
785 | "Error opening dentry; rc = [%i]\n", rc); | |
237fead6 MH |
786 | goto out_free; |
787 | } | |
788 | ecryptfs_set_file_lower(&fake_ecryptfs_file, lower_file); | |
789 | /* Switch on growing or shrinking file */ | |
790 | if (new_length > i_size) { | |
791 | rc = ecryptfs_fill_zeros(&fake_ecryptfs_file, new_length); | |
792 | if (rc) { | |
793 | ecryptfs_printk(KERN_ERR, | |
794 | "Problem with fill_zeros\n"); | |
795 | goto out_fput; | |
796 | } | |
797 | i_size_write(inode, new_length); | |
dd2a3b7a MH |
798 | rc = ecryptfs_write_inode_size_to_metadata( |
799 | lower_file, lower_dentry->d_inode, inode, dentry, | |
800 | ECRYPTFS_LOWER_I_MUTEX_NOT_HELD); | |
237fead6 | 801 | if (rc) { |
dd2a3b7a MH |
802 | printk(KERN_ERR "Problem with " |
803 | "ecryptfs_write_inode_size_to_metadata; " | |
804 | "rc = [%d]\n", rc); | |
237fead6 MH |
805 | goto out_fput; |
806 | } | |
807 | } else { /* new_length < i_size_read(inode) */ | |
808 | vmtruncate(inode, new_length); | |
dd2a3b7a MH |
809 | rc = ecryptfs_write_inode_size_to_metadata( |
810 | lower_file, lower_dentry->d_inode, inode, dentry, | |
811 | ECRYPTFS_LOWER_I_MUTEX_NOT_HELD); | |
812 | if (rc) { | |
813 | printk(KERN_ERR "Problem with " | |
814 | "ecryptfs_write_inode_size_to_metadata; " | |
815 | "rc = [%d]\n", rc); | |
816 | goto out_fput; | |
817 | } | |
237fead6 MH |
818 | /* We are reducing the size of the ecryptfs file, and need to |
819 | * know if we need to reduce the size of the lower file. */ | |
820 | lower_size_before_truncate = | |
821 | upper_size_to_lower_size(crypt_stat, i_size); | |
822 | lower_size_after_truncate = | |
823 | upper_size_to_lower_size(crypt_stat, new_length); | |
824 | if (lower_size_after_truncate < lower_size_before_truncate) | |
825 | vmtruncate(lower_dentry->d_inode, | |
826 | lower_size_after_truncate); | |
827 | } | |
828 | /* Update the access times */ | |
829 | lower_dentry->d_inode->i_mtime = lower_dentry->d_inode->i_ctime | |
830 | = CURRENT_TIME; | |
831 | mark_inode_dirty_sync(inode); | |
832 | out_fput: | |
7ff1d74f MH |
833 | if ((rc = ecryptfs_close_lower_file(lower_file))) |
834 | printk(KERN_ERR "Error closing lower_file\n"); | |
237fead6 MH |
835 | out_free: |
836 | if (ecryptfs_file_to_private(&fake_ecryptfs_file)) | |
837 | kmem_cache_free(ecryptfs_file_info_cache, | |
838 | ecryptfs_file_to_private(&fake_ecryptfs_file)); | |
839 | out: | |
840 | return rc; | |
841 | } | |
842 | ||
843 | static int | |
844 | ecryptfs_permission(struct inode *inode, int mask, struct nameidata *nd) | |
845 | { | |
846 | int rc; | |
847 | ||
848 | if (nd) { | |
849 | struct vfsmount *vfsmnt_save = nd->mnt; | |
850 | struct dentry *dentry_save = nd->dentry; | |
851 | ||
852 | nd->mnt = ecryptfs_dentry_to_lower_mnt(nd->dentry); | |
853 | nd->dentry = ecryptfs_dentry_to_lower(nd->dentry); | |
854 | rc = permission(ecryptfs_inode_to_lower(inode), mask, nd); | |
855 | nd->mnt = vfsmnt_save; | |
856 | nd->dentry = dentry_save; | |
857 | } else | |
858 | rc = permission(ecryptfs_inode_to_lower(inode), mask, NULL); | |
859 | return rc; | |
860 | } | |
861 | ||
862 | /** | |
863 | * ecryptfs_setattr | |
864 | * @dentry: dentry handle to the inode to modify | |
865 | * @ia: Structure with flags of what to change and values | |
866 | * | |
867 | * Updates the metadata of an inode. If the update is to the size | |
868 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
869 | * of both the ecryptfs inode and the lower inode. | |
870 | * | |
871 | * All other metadata changes will be passed right to the lower filesystem, | |
872 | * and we will just update our inode to look like the lower. | |
873 | */ | |
874 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
875 | { | |
876 | int rc = 0; | |
877 | struct dentry *lower_dentry; | |
878 | struct inode *inode; | |
879 | struct inode *lower_inode; | |
880 | struct ecryptfs_crypt_stat *crypt_stat; | |
881 | ||
882 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
883 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
884 | inode = dentry->d_inode; | |
885 | lower_inode = ecryptfs_inode_to_lower(inode); | |
886 | if (ia->ia_valid & ATTR_SIZE) { | |
887 | ecryptfs_printk(KERN_DEBUG, | |
888 | "ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n", | |
889 | ia->ia_valid, ATTR_SIZE); | |
890 | rc = ecryptfs_truncate(dentry, ia->ia_size); | |
891 | /* ecryptfs_truncate handles resizing of the lower file */ | |
892 | ia->ia_valid &= ~ATTR_SIZE; | |
893 | ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [%x]\n", | |
894 | ia->ia_valid); | |
895 | if (rc < 0) | |
896 | goto out; | |
897 | } | |
898 | rc = notify_change(lower_dentry, ia); | |
899 | out: | |
0cc72dc7 | 900 | fsstack_copy_attr_all(inode, lower_inode, NULL); |
237fead6 MH |
901 | return rc; |
902 | } | |
903 | ||
dd2a3b7a | 904 | int |
237fead6 MH |
905 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
906 | size_t size, int flags) | |
907 | { | |
908 | int rc = 0; | |
909 | struct dentry *lower_dentry; | |
910 | ||
911 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
912 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
913 | rc = -ENOSYS; | |
914 | goto out; | |
915 | } | |
916 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
917 | rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, | |
918 | size, flags); | |
919 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
920 | out: | |
921 | return rc; | |
922 | } | |
923 | ||
dd2a3b7a | 924 | ssize_t |
237fead6 MH |
925 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
926 | size_t size) | |
927 | { | |
928 | int rc = 0; | |
929 | struct dentry *lower_dentry; | |
930 | ||
931 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
932 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
933 | rc = -ENOSYS; | |
934 | goto out; | |
935 | } | |
936 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
937 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
938 | size); | |
939 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
940 | out: | |
941 | return rc; | |
942 | } | |
943 | ||
944 | static ssize_t | |
945 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
946 | { | |
947 | int rc = 0; | |
948 | struct dentry *lower_dentry; | |
949 | ||
950 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
951 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
952 | rc = -ENOSYS; | |
953 | goto out; | |
954 | } | |
955 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
956 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
957 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
958 | out: | |
959 | return rc; | |
960 | } | |
961 | ||
962 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
963 | { | |
964 | int rc = 0; | |
965 | struct dentry *lower_dentry; | |
966 | ||
967 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
968 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
969 | rc = -ENOSYS; | |
970 | goto out; | |
971 | } | |
972 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
973 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
974 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
975 | out: | |
976 | return rc; | |
977 | } | |
978 | ||
979 | int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) | |
980 | { | |
981 | if ((ecryptfs_inode_to_lower(inode) | |
982 | == (struct inode *)candidate_lower_inode)) | |
983 | return 1; | |
984 | else | |
985 | return 0; | |
986 | } | |
987 | ||
988 | int ecryptfs_inode_set(struct inode *inode, void *lower_inode) | |
989 | { | |
990 | ecryptfs_init_inode(inode, (struct inode *)lower_inode); | |
991 | return 0; | |
992 | } | |
993 | ||
994 | struct inode_operations ecryptfs_symlink_iops = { | |
995 | .readlink = ecryptfs_readlink, | |
996 | .follow_link = ecryptfs_follow_link, | |
997 | .put_link = ecryptfs_put_link, | |
998 | .permission = ecryptfs_permission, | |
999 | .setattr = ecryptfs_setattr, | |
1000 | .setxattr = ecryptfs_setxattr, | |
1001 | .getxattr = ecryptfs_getxattr, | |
1002 | .listxattr = ecryptfs_listxattr, | |
1003 | .removexattr = ecryptfs_removexattr | |
1004 | }; | |
1005 | ||
1006 | struct inode_operations ecryptfs_dir_iops = { | |
1007 | .create = ecryptfs_create, | |
1008 | .lookup = ecryptfs_lookup, | |
1009 | .link = ecryptfs_link, | |
1010 | .unlink = ecryptfs_unlink, | |
1011 | .symlink = ecryptfs_symlink, | |
1012 | .mkdir = ecryptfs_mkdir, | |
1013 | .rmdir = ecryptfs_rmdir, | |
1014 | .mknod = ecryptfs_mknod, | |
1015 | .rename = ecryptfs_rename, | |
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 | ||
1024 | struct inode_operations ecryptfs_main_iops = { | |
1025 | .permission = ecryptfs_permission, | |
1026 | .setattr = ecryptfs_setattr, | |
1027 | .setxattr = ecryptfs_setxattr, | |
1028 | .getxattr = ecryptfs_getxattr, | |
1029 | .listxattr = ecryptfs_listxattr, | |
1030 | .removexattr = ecryptfs_removexattr | |
1031 | }; |