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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 | |
6 | * Copyright (C) 2004-2006 International Business Machines Corp. | |
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> | |
33 | #include "ecryptfs_kernel.h" | |
34 | ||
35 | static struct dentry *lock_parent(struct dentry *dentry) | |
36 | { | |
37 | struct dentry *dir; | |
38 | ||
39 | dir = dget(dentry->d_parent); | |
40 | mutex_lock(&(dir->d_inode->i_mutex)); | |
41 | return dir; | |
42 | } | |
43 | ||
44 | static void unlock_parent(struct dentry *dentry) | |
45 | { | |
46 | mutex_unlock(&(dentry->d_parent->d_inode->i_mutex)); | |
47 | dput(dentry->d_parent); | |
48 | } | |
49 | ||
50 | static void unlock_dir(struct dentry *dir) | |
51 | { | |
52 | mutex_unlock(&dir->d_inode->i_mutex); | |
53 | dput(dir); | |
54 | } | |
55 | ||
56 | void ecryptfs_copy_inode_size(struct inode *dst, const struct inode *src) | |
57 | { | |
58 | i_size_write(dst, i_size_read((struct inode *)src)); | |
59 | dst->i_blocks = src->i_blocks; | |
60 | } | |
61 | ||
62 | void ecryptfs_copy_attr_atime(struct inode *dest, const struct inode *src) | |
63 | { | |
64 | dest->i_atime = src->i_atime; | |
65 | } | |
66 | ||
67 | static void ecryptfs_copy_attr_times(struct inode *dest, | |
68 | const struct inode *src) | |
69 | { | |
70 | dest->i_atime = src->i_atime; | |
71 | dest->i_mtime = src->i_mtime; | |
72 | dest->i_ctime = src->i_ctime; | |
73 | } | |
74 | ||
75 | static void ecryptfs_copy_attr_timesizes(struct inode *dest, | |
76 | const struct inode *src) | |
77 | { | |
78 | dest->i_atime = src->i_atime; | |
79 | dest->i_mtime = src->i_mtime; | |
80 | dest->i_ctime = src->i_ctime; | |
81 | ecryptfs_copy_inode_size(dest, src); | |
82 | } | |
83 | ||
84 | void ecryptfs_copy_attr_all(struct inode *dest, const struct inode *src) | |
85 | { | |
86 | dest->i_mode = src->i_mode; | |
87 | dest->i_nlink = src->i_nlink; | |
88 | dest->i_uid = src->i_uid; | |
89 | dest->i_gid = src->i_gid; | |
90 | dest->i_rdev = src->i_rdev; | |
91 | dest->i_atime = src->i_atime; | |
92 | dest->i_mtime = src->i_mtime; | |
93 | dest->i_ctime = src->i_ctime; | |
94 | dest->i_blkbits = src->i_blkbits; | |
95 | dest->i_flags = src->i_flags; | |
96 | } | |
97 | ||
98 | /** | |
99 | * ecryptfs_create_underlying_file | |
100 | * @lower_dir_inode: inode of the parent in the lower fs of the new file | |
101 | * @lower_dentry: New file's dentry in the lower fs | |
102 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
103 | * @mode: The mode of the new file | |
104 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
105 | * | |
106 | * Creates the file in the lower file system. | |
107 | * | |
108 | * Returns zero on success; non-zero on error condition | |
109 | */ | |
110 | static int | |
111 | ecryptfs_create_underlying_file(struct inode *lower_dir_inode, | |
112 | struct dentry *dentry, int mode, | |
113 | struct nameidata *nd) | |
114 | { | |
115 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
116 | struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); | |
117 | struct dentry *dentry_save; | |
118 | struct vfsmount *vfsmount_save; | |
119 | int rc; | |
120 | ||
121 | dentry_save = nd->dentry; | |
122 | vfsmount_save = nd->mnt; | |
123 | nd->dentry = lower_dentry; | |
124 | nd->mnt = lower_mnt; | |
125 | rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); | |
126 | nd->dentry = dentry_save; | |
127 | nd->mnt = vfsmount_save; | |
128 | return rc; | |
129 | } | |
130 | ||
131 | /** | |
132 | * ecryptfs_do_create | |
133 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
134 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
135 | * @mode: The mode of the new file | |
136 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
137 | * | |
138 | * Creates the underlying file and the eCryptfs inode which will link to | |
139 | * it. It will also update the eCryptfs directory inode to mimic the | |
140 | * stat of the lower directory inode. | |
141 | * | |
142 | * Returns zero on success; non-zero on error condition | |
143 | */ | |
144 | static int | |
145 | ecryptfs_do_create(struct inode *directory_inode, | |
146 | struct dentry *ecryptfs_dentry, int mode, | |
147 | struct nameidata *nd) | |
148 | { | |
149 | int rc; | |
150 | struct dentry *lower_dentry; | |
151 | struct dentry *lower_dir_dentry; | |
152 | ||
153 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
154 | lower_dir_dentry = lock_parent(lower_dentry); | |
155 | if (unlikely(IS_ERR(lower_dir_dentry))) { | |
156 | ecryptfs_printk(KERN_ERR, "Error locking directory of " | |
157 | "dentry\n"); | |
158 | rc = PTR_ERR(lower_dir_dentry); | |
159 | goto out; | |
160 | } | |
161 | rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, | |
162 | ecryptfs_dentry, mode, nd); | |
163 | if (unlikely(rc)) { | |
164 | ecryptfs_printk(KERN_ERR, | |
165 | "Failure to create underlying file\n"); | |
166 | goto out_lock; | |
167 | } | |
168 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, | |
169 | directory_inode->i_sb, 0); | |
170 | if (rc) { | |
171 | ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); | |
172 | goto out_lock; | |
173 | } | |
174 | ecryptfs_copy_attr_timesizes(directory_inode, | |
175 | lower_dir_dentry->d_inode); | |
176 | out_lock: | |
177 | unlock_dir(lower_dir_dentry); | |
178 | out: | |
179 | return rc; | |
180 | } | |
181 | ||
182 | /** | |
183 | * grow_file | |
184 | * @ecryptfs_dentry: the ecryptfs dentry | |
185 | * @lower_file: The lower file | |
186 | * @inode: The ecryptfs inode | |
187 | * @lower_inode: The lower inode | |
188 | * | |
189 | * This is the code which will grow the file to its correct size. | |
190 | */ | |
191 | static int grow_file(struct dentry *ecryptfs_dentry, struct file *lower_file, | |
192 | struct inode *inode, struct inode *lower_inode) | |
193 | { | |
194 | int rc = 0; | |
195 | struct file fake_file; | |
196 | struct ecryptfs_file_info tmp_file_info; | |
197 | ||
198 | memset(&fake_file, 0, sizeof(fake_file)); | |
199 | fake_file.f_dentry = ecryptfs_dentry; | |
200 | memset(&tmp_file_info, 0, sizeof(tmp_file_info)); | |
201 | ecryptfs_set_file_private(&fake_file, &tmp_file_info); | |
202 | ecryptfs_set_file_lower(&fake_file, lower_file); | |
203 | rc = ecryptfs_fill_zeros(&fake_file, 1); | |
204 | if (rc) { | |
205 | ECRYPTFS_SET_FLAG( | |
206 | ecryptfs_inode_to_private(inode)->crypt_stat.flags, | |
207 | ECRYPTFS_SECURITY_WARNING); | |
208 | ecryptfs_printk(KERN_WARNING, "Error attempting to fill zeros " | |
209 | "in file; rc = [%d]\n", rc); | |
210 | goto out; | |
211 | } | |
212 | i_size_write(inode, 0); | |
213 | ecryptfs_write_inode_size_to_header(lower_file, lower_inode, inode); | |
214 | ECRYPTFS_SET_FLAG(ecryptfs_inode_to_private(inode)->crypt_stat.flags, | |
215 | ECRYPTFS_NEW_FILE); | |
216 | out: | |
217 | return rc; | |
218 | } | |
219 | ||
220 | /** | |
221 | * ecryptfs_initialize_file | |
222 | * | |
223 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
224 | * file with a header and first data page. | |
225 | * | |
226 | * Returns zero on success | |
227 | */ | |
228 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) | |
229 | { | |
230 | int rc = 0; | |
231 | int lower_flags; | |
232 | struct ecryptfs_crypt_stat *crypt_stat; | |
233 | struct dentry *lower_dentry; | |
234 | struct dentry *tlower_dentry = NULL; | |
235 | struct file *lower_file; | |
236 | struct inode *inode, *lower_inode; | |
237 | struct vfsmount *lower_mnt; | |
238 | ||
239 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
240 | ecryptfs_printk(KERN_DEBUG, "lower_dentry->d_name.name = [%s]\n", | |
241 | lower_dentry->d_name.name); | |
242 | inode = ecryptfs_dentry->d_inode; | |
243 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
244 | tlower_dentry = dget(lower_dentry); | |
245 | if (!tlower_dentry) { | |
246 | rc = -ENOMEM; | |
247 | ecryptfs_printk(KERN_ERR, "Error dget'ing lower_dentry\n"); | |
248 | goto out; | |
249 | } | |
250 | lower_flags = ((O_CREAT | O_WRONLY | O_TRUNC) & O_ACCMODE) | O_RDWR; | |
251 | #if BITS_PER_LONG != 32 | |
252 | lower_flags |= O_LARGEFILE; | |
253 | #endif | |
254 | lower_mnt = ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry); | |
255 | mntget(lower_mnt); | |
256 | /* Corresponding fput() at end of this function */ | |
257 | lower_file = dentry_open(tlower_dentry, lower_mnt, lower_flags); | |
258 | if (IS_ERR(lower_file)) { | |
259 | rc = PTR_ERR(lower_file); | |
260 | ecryptfs_printk(KERN_ERR, | |
261 | "Error opening dentry; rc = [%i]\n", rc); | |
262 | goto out; | |
263 | } | |
264 | /* fput(lower_file) should handle the puts if we do this */ | |
265 | lower_file->f_dentry = tlower_dentry; | |
266 | lower_file->f_vfsmnt = lower_mnt; | |
267 | lower_inode = tlower_dentry->d_inode; | |
268 | if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { | |
269 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); | |
270 | ECRYPTFS_CLEAR_FLAG(crypt_stat->flags, ECRYPTFS_ENCRYPTED); | |
271 | goto out_fput; | |
272 | } | |
273 | ECRYPTFS_SET_FLAG(crypt_stat->flags, ECRYPTFS_NEW_FILE); | |
274 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); | |
275 | rc = ecryptfs_new_file_context(ecryptfs_dentry); | |
276 | if (rc) { | |
277 | ecryptfs_printk(KERN_DEBUG, "Error creating new file " | |
278 | "context\n"); | |
279 | goto out_fput; | |
280 | } | |
281 | rc = ecryptfs_write_headers(ecryptfs_dentry, lower_file); | |
282 | if (rc) { | |
283 | ecryptfs_printk(KERN_DEBUG, "Error writing headers\n"); | |
284 | goto out_fput; | |
285 | } | |
286 | rc = grow_file(ecryptfs_dentry, lower_file, inode, lower_inode); | |
287 | out_fput: | |
288 | fput(lower_file); | |
289 | out: | |
290 | return rc; | |
291 | } | |
292 | ||
293 | /** | |
294 | * ecryptfs_create | |
295 | * @dir: The inode of the directory in which to create the file. | |
296 | * @dentry: The eCryptfs dentry | |
297 | * @mode: The mode of the new file. | |
298 | * @nd: nameidata | |
299 | * | |
300 | * Creates a new file. | |
301 | * | |
302 | * Returns zero on success; non-zero on error condition | |
303 | */ | |
304 | static int | |
305 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
306 | int mode, struct nameidata *nd) | |
307 | { | |
308 | int rc; | |
309 | ||
310 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); | |
311 | if (unlikely(rc)) { | |
312 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" | |
313 | "lower filesystem\n"); | |
314 | goto out; | |
315 | } | |
316 | /* At this point, a file exists on "disk"; we need to make sure | |
317 | * that this on disk file is prepared to be an ecryptfs file */ | |
318 | rc = ecryptfs_initialize_file(ecryptfs_dentry); | |
319 | out: | |
320 | return rc; | |
321 | } | |
322 | ||
323 | /** | |
324 | * ecryptfs_lookup | |
325 | * @dir: inode | |
326 | * @dentry: The dentry | |
327 | * @nd: nameidata, may be NULL | |
328 | * | |
329 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
330 | * dentry cache and continue on to read it from the disk. | |
331 | */ | |
332 | static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, | |
333 | struct nameidata *nd) | |
334 | { | |
335 | int rc = 0; | |
336 | struct dentry *lower_dir_dentry; | |
337 | struct dentry *lower_dentry; | |
338 | struct vfsmount *lower_mnt; | |
339 | struct dentry *tlower_dentry = NULL; | |
340 | char *encoded_name; | |
341 | unsigned int encoded_namelen; | |
342 | struct ecryptfs_crypt_stat *crypt_stat = NULL; | |
343 | char *page_virt = NULL; | |
344 | struct inode *lower_inode; | |
345 | u64 file_size; | |
346 | ||
347 | lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); | |
348 | dentry->d_op = &ecryptfs_dops; | |
349 | if ((dentry->d_name.len == 1 && !strcmp(dentry->d_name.name, ".")) | |
350 | || (dentry->d_name.len == 2 && !strcmp(dentry->d_name.name, ".."))) | |
351 | goto out_drop; | |
352 | encoded_namelen = ecryptfs_encode_filename(crypt_stat, | |
353 | dentry->d_name.name, | |
354 | dentry->d_name.len, | |
355 | &encoded_name); | |
356 | if (encoded_namelen < 0) { | |
357 | rc = encoded_namelen; | |
358 | goto out_drop; | |
359 | } | |
360 | ecryptfs_printk(KERN_DEBUG, "encoded_name = [%s]; encoded_namelen " | |
361 | "= [%d]\n", encoded_name, encoded_namelen); | |
362 | lower_dentry = lookup_one_len(encoded_name, lower_dir_dentry, | |
363 | encoded_namelen - 1); | |
364 | kfree(encoded_name); | |
365 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); | |
366 | if (IS_ERR(lower_dentry)) { | |
367 | ecryptfs_printk(KERN_ERR, "ERR from lower_dentry\n"); | |
368 | rc = PTR_ERR(lower_dentry); | |
369 | goto out_drop; | |
370 | } | |
371 | ecryptfs_printk(KERN_DEBUG, "lower_dentry = [%p]; lower_dentry->" | |
372 | "d_name.name = [%s]\n", lower_dentry, | |
373 | lower_dentry->d_name.name); | |
374 | lower_inode = lower_dentry->d_inode; | |
375 | ecryptfs_copy_attr_atime(dir, lower_dir_dentry->d_inode); | |
376 | BUG_ON(!atomic_read(&lower_dentry->d_count)); | |
377 | ecryptfs_set_dentry_private(dentry, | |
378 | kmem_cache_alloc(ecryptfs_dentry_info_cache, | |
379 | SLAB_KERNEL)); | |
380 | if (!ecryptfs_dentry_to_private(dentry)) { | |
381 | rc = -ENOMEM; | |
382 | ecryptfs_printk(KERN_ERR, "Out of memory whilst attempting " | |
383 | "to allocate ecryptfs_dentry_info struct\n"); | |
384 | goto out_dput; | |
385 | } | |
386 | ecryptfs_set_dentry_lower(dentry, lower_dentry); | |
387 | ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); | |
388 | if (!lower_dentry->d_inode) { | |
389 | /* We want to add because we couldn't find in lower */ | |
390 | d_add(dentry, NULL); | |
391 | goto out; | |
392 | } | |
393 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 1); | |
394 | if (rc) { | |
395 | ecryptfs_printk(KERN_ERR, "Error interposing\n"); | |
396 | goto out_dput; | |
397 | } | |
398 | if (S_ISDIR(lower_inode->i_mode)) { | |
399 | ecryptfs_printk(KERN_DEBUG, "Is a directory; returning\n"); | |
400 | goto out; | |
401 | } | |
402 | if (S_ISLNK(lower_inode->i_mode)) { | |
403 | ecryptfs_printk(KERN_DEBUG, "Is a symlink; returning\n"); | |
404 | goto out; | |
405 | } | |
406 | if (!nd) { | |
407 | ecryptfs_printk(KERN_DEBUG, "We have a NULL nd, just leave" | |
408 | "as we *think* we are about to unlink\n"); | |
409 | goto out; | |
410 | } | |
411 | tlower_dentry = dget(lower_dentry); | |
412 | if (!tlower_dentry || IS_ERR(tlower_dentry)) { | |
413 | rc = -ENOMEM; | |
414 | ecryptfs_printk(KERN_ERR, "Cannot dget lower_dentry\n"); | |
415 | goto out_dput; | |
416 | } | |
417 | /* Released in this function */ | |
418 | page_virt = | |
419 | (char *)kmem_cache_alloc(ecryptfs_header_cache_2, | |
420 | SLAB_USER); | |
421 | if (!page_virt) { | |
422 | rc = -ENOMEM; | |
423 | ecryptfs_printk(KERN_ERR, | |
424 | "Cannot ecryptfs_kmalloc a page\n"); | |
425 | goto out_dput; | |
426 | } | |
427 | memset(page_virt, 0, PAGE_CACHE_SIZE); | |
428 | rc = ecryptfs_read_header_region(page_virt, tlower_dentry, nd->mnt); | |
429 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
430 | if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_POLICY_APPLIED)) | |
431 | ecryptfs_set_default_sizes(crypt_stat); | |
432 | if (rc) { | |
433 | rc = 0; | |
434 | ecryptfs_printk(KERN_WARNING, "Error reading header region;" | |
435 | " assuming unencrypted\n"); | |
436 | } else { | |
437 | if (!contains_ecryptfs_marker(page_virt | |
438 | + ECRYPTFS_FILE_SIZE_BYTES)) { | |
439 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); | |
440 | goto out; | |
441 | } | |
442 | memcpy(&file_size, page_virt, sizeof(file_size)); | |
443 | file_size = be64_to_cpu(file_size); | |
444 | i_size_write(dentry->d_inode, (loff_t)file_size); | |
445 | } | |
446 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); | |
447 | goto out; | |
448 | ||
449 | out_dput: | |
450 | dput(lower_dentry); | |
451 | if (tlower_dentry) | |
452 | dput(tlower_dentry); | |
453 | out_drop: | |
454 | d_drop(dentry); | |
455 | out: | |
456 | return ERR_PTR(rc); | |
457 | } | |
458 | ||
459 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
460 | struct dentry *new_dentry) | |
461 | { | |
462 | struct dentry *lower_old_dentry; | |
463 | struct dentry *lower_new_dentry; | |
464 | struct dentry *lower_dir_dentry; | |
465 | u64 file_size_save; | |
466 | int rc; | |
467 | ||
468 | file_size_save = i_size_read(old_dentry->d_inode); | |
469 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
470 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
471 | dget(lower_old_dentry); | |
472 | dget(lower_new_dentry); | |
473 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
474 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
475 | lower_new_dentry); | |
476 | if (rc || !lower_new_dentry->d_inode) | |
477 | goto out_lock; | |
478 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); | |
479 | if (rc) | |
480 | goto out_lock; | |
481 | ecryptfs_copy_attr_timesizes(dir, lower_new_dentry->d_inode); | |
482 | old_dentry->d_inode->i_nlink = | |
483 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; | |
484 | i_size_write(new_dentry->d_inode, file_size_save); | |
485 | out_lock: | |
486 | unlock_dir(lower_dir_dentry); | |
487 | dput(lower_new_dentry); | |
488 | dput(lower_old_dentry); | |
489 | if (!new_dentry->d_inode) | |
490 | d_drop(new_dentry); | |
491 | return rc; | |
492 | } | |
493 | ||
494 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
495 | { | |
496 | int rc = 0; | |
497 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
498 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
499 | ||
500 | lock_parent(lower_dentry); | |
501 | rc = vfs_unlink(lower_dir_inode, lower_dentry); | |
502 | if (rc) { | |
503 | ecryptfs_printk(KERN_ERR, "Error in vfs_unlink\n"); | |
504 | goto out_unlock; | |
505 | } | |
506 | ecryptfs_copy_attr_times(dir, lower_dir_inode); | |
507 | dentry->d_inode->i_nlink = | |
508 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; | |
509 | dentry->d_inode->i_ctime = dir->i_ctime; | |
510 | out_unlock: | |
511 | unlock_parent(lower_dentry); | |
512 | return rc; | |
513 | } | |
514 | ||
515 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
516 | const char *symname) | |
517 | { | |
518 | int rc; | |
519 | struct dentry *lower_dentry; | |
520 | struct dentry *lower_dir_dentry; | |
521 | umode_t mode; | |
522 | char *encoded_symname; | |
523 | unsigned int encoded_symlen; | |
524 | struct ecryptfs_crypt_stat *crypt_stat = NULL; | |
525 | ||
526 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
527 | dget(lower_dentry); | |
528 | lower_dir_dentry = lock_parent(lower_dentry); | |
529 | mode = S_IALLUGO; | |
530 | encoded_symlen = ecryptfs_encode_filename(crypt_stat, symname, | |
531 | strlen(symname), | |
532 | &encoded_symname); | |
533 | if (encoded_symlen < 0) { | |
534 | rc = encoded_symlen; | |
535 | goto out_lock; | |
536 | } | |
537 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, | |
538 | encoded_symname, mode); | |
539 | kfree(encoded_symname); | |
540 | if (rc || !lower_dentry->d_inode) | |
541 | goto out_lock; | |
542 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
543 | if (rc) | |
544 | goto out_lock; | |
545 | ecryptfs_copy_attr_timesizes(dir, lower_dir_dentry->d_inode); | |
546 | out_lock: | |
547 | unlock_dir(lower_dir_dentry); | |
548 | dput(lower_dentry); | |
549 | if (!dentry->d_inode) | |
550 | d_drop(dentry); | |
551 | return rc; | |
552 | } | |
553 | ||
554 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
555 | { | |
556 | int rc; | |
557 | struct dentry *lower_dentry; | |
558 | struct dentry *lower_dir_dentry; | |
559 | ||
560 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
561 | lower_dir_dentry = lock_parent(lower_dentry); | |
562 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
563 | if (rc || !lower_dentry->d_inode) | |
564 | goto out; | |
565 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
566 | if (rc) | |
567 | goto out; | |
568 | ecryptfs_copy_attr_timesizes(dir, lower_dir_dentry->d_inode); | |
569 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; | |
570 | out: | |
571 | unlock_dir(lower_dir_dentry); | |
572 | if (!dentry->d_inode) | |
573 | d_drop(dentry); | |
574 | return rc; | |
575 | } | |
576 | ||
577 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
578 | { | |
579 | int rc = 0; | |
580 | struct dentry *tdentry = NULL; | |
581 | struct dentry *lower_dentry; | |
582 | struct dentry *tlower_dentry = NULL; | |
583 | struct dentry *lower_dir_dentry; | |
584 | ||
585 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
586 | if (!(tdentry = dget(dentry))) { | |
587 | rc = -EINVAL; | |
588 | ecryptfs_printk(KERN_ERR, "Error dget'ing dentry [%p]\n", | |
589 | dentry); | |
590 | goto out; | |
591 | } | |
592 | lower_dir_dentry = lock_parent(lower_dentry); | |
593 | if (!(tlower_dentry = dget(lower_dentry))) { | |
594 | rc = -EINVAL; | |
595 | ecryptfs_printk(KERN_ERR, "Error dget'ing lower_dentry " | |
596 | "[%p]\n", lower_dentry); | |
597 | goto out; | |
598 | } | |
599 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); | |
600 | if (!rc) { | |
601 | d_delete(tlower_dentry); | |
602 | tlower_dentry = NULL; | |
603 | } | |
604 | ecryptfs_copy_attr_times(dir, lower_dir_dentry->d_inode); | |
605 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; | |
606 | unlock_dir(lower_dir_dentry); | |
607 | if (!rc) | |
608 | d_drop(dentry); | |
609 | out: | |
610 | if (tdentry) | |
611 | dput(tdentry); | |
612 | if (tlower_dentry) | |
613 | dput(tlower_dentry); | |
614 | return rc; | |
615 | } | |
616 | ||
617 | static int | |
618 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
619 | { | |
620 | int rc; | |
621 | struct dentry *lower_dentry; | |
622 | struct dentry *lower_dir_dentry; | |
623 | ||
624 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
625 | lower_dir_dentry = lock_parent(lower_dentry); | |
626 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
627 | if (rc || !lower_dentry->d_inode) | |
628 | goto out; | |
629 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
630 | if (rc) | |
631 | goto out; | |
632 | ecryptfs_copy_attr_timesizes(dir, lower_dir_dentry->d_inode); | |
633 | out: | |
634 | unlock_dir(lower_dir_dentry); | |
635 | if (!dentry->d_inode) | |
636 | d_drop(dentry); | |
637 | return rc; | |
638 | } | |
639 | ||
640 | static int | |
641 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
642 | struct inode *new_dir, struct dentry *new_dentry) | |
643 | { | |
644 | int rc; | |
645 | struct dentry *lower_old_dentry; | |
646 | struct dentry *lower_new_dentry; | |
647 | struct dentry *lower_old_dir_dentry; | |
648 | struct dentry *lower_new_dir_dentry; | |
649 | ||
650 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
651 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
652 | dget(lower_old_dentry); | |
653 | dget(lower_new_dentry); | |
654 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
655 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
656 | lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
657 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, | |
658 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
659 | if (rc) | |
660 | goto out_lock; | |
661 | ecryptfs_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); | |
662 | if (new_dir != old_dir) | |
663 | ecryptfs_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); | |
664 | out_lock: | |
665 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
666 | dput(lower_new_dentry); | |
667 | dput(lower_old_dentry); | |
668 | return rc; | |
669 | } | |
670 | ||
671 | static int | |
672 | ecryptfs_readlink(struct dentry *dentry, char __user * buf, int bufsiz) | |
673 | { | |
674 | int rc; | |
675 | struct dentry *lower_dentry; | |
676 | char *decoded_name; | |
677 | char *lower_buf; | |
678 | mm_segment_t old_fs; | |
679 | struct ecryptfs_crypt_stat *crypt_stat; | |
680 | ||
681 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
682 | if (!lower_dentry->d_inode->i_op || | |
683 | !lower_dentry->d_inode->i_op->readlink) { | |
684 | rc = -EINVAL; | |
685 | goto out; | |
686 | } | |
687 | /* Released in this function */ | |
688 | lower_buf = kmalloc(bufsiz, GFP_KERNEL); | |
689 | if (lower_buf == NULL) { | |
690 | ecryptfs_printk(KERN_ERR, "Out of memory\n"); | |
691 | rc = -ENOMEM; | |
692 | goto out; | |
693 | } | |
694 | old_fs = get_fs(); | |
695 | set_fs(get_ds()); | |
696 | ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " | |
697 | "lower_dentry->d_name.name = [%s]\n", | |
698 | lower_dentry->d_name.name); | |
699 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, | |
700 | (char __user *)lower_buf, | |
701 | bufsiz); | |
702 | set_fs(old_fs); | |
703 | if (rc >= 0) { | |
704 | crypt_stat = NULL; | |
705 | rc = ecryptfs_decode_filename(crypt_stat, lower_buf, rc, | |
706 | &decoded_name); | |
707 | if (rc == -ENOMEM) | |
708 | goto out_free_lower_buf; | |
709 | if (rc > 0) { | |
710 | ecryptfs_printk(KERN_DEBUG, "Copying [%d] bytes " | |
711 | "to userspace: [%*s]\n", rc, | |
712 | decoded_name); | |
713 | if (copy_to_user(buf, decoded_name, rc)) | |
714 | rc = -EFAULT; | |
715 | } | |
716 | kfree(decoded_name); | |
717 | ecryptfs_copy_attr_atime(dentry->d_inode, | |
718 | lower_dentry->d_inode); | |
719 | } | |
720 | out_free_lower_buf: | |
721 | kfree(lower_buf); | |
722 | out: | |
723 | return rc; | |
724 | } | |
725 | ||
726 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
727 | { | |
728 | char *buf; | |
729 | int len = PAGE_SIZE, rc; | |
730 | mm_segment_t old_fs; | |
731 | ||
732 | /* Released in ecryptfs_put_link(); only release here on error */ | |
733 | buf = kmalloc(len, GFP_KERNEL); | |
734 | if (!buf) { | |
735 | rc = -ENOMEM; | |
736 | goto out; | |
737 | } | |
738 | old_fs = get_fs(); | |
739 | set_fs(get_ds()); | |
740 | ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " | |
741 | "dentry->d_name.name = [%s]\n", dentry->d_name.name); | |
742 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); | |
743 | buf[rc] = '\0'; | |
744 | set_fs(old_fs); | |
745 | if (rc < 0) | |
746 | goto out_free; | |
747 | rc = 0; | |
748 | nd_set_link(nd, buf); | |
749 | goto out; | |
750 | out_free: | |
751 | kfree(buf); | |
752 | out: | |
753 | return ERR_PTR(rc); | |
754 | } | |
755 | ||
756 | static void | |
757 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
758 | { | |
759 | /* Free the char* */ | |
760 | kfree(nd_get_link(nd)); | |
761 | } | |
762 | ||
763 | /** | |
764 | * upper_size_to_lower_size | |
765 | * @crypt_stat: Crypt_stat associated with file | |
766 | * @upper_size: Size of the upper file | |
767 | * | |
768 | * Calculate the requried size of the lower file based on the | |
769 | * specified size of the upper file. This calculation is based on the | |
770 | * number of headers in the underlying file and the extent size. | |
771 | * | |
772 | * Returns Calculated size of the lower file. | |
773 | */ | |
774 | static loff_t | |
775 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
776 | loff_t upper_size) | |
777 | { | |
778 | loff_t lower_size; | |
779 | ||
780 | lower_size = ( crypt_stat->header_extent_size | |
781 | * crypt_stat->num_header_extents_at_front ); | |
782 | if (upper_size != 0) { | |
783 | loff_t num_extents; | |
784 | ||
785 | num_extents = upper_size >> crypt_stat->extent_shift; | |
786 | if (upper_size & ~crypt_stat->extent_mask) | |
787 | num_extents++; | |
788 | lower_size += (num_extents * crypt_stat->extent_size); | |
789 | } | |
790 | return lower_size; | |
791 | } | |
792 | ||
793 | /** | |
794 | * ecryptfs_truncate | |
795 | * @dentry: The ecryptfs layer dentry | |
796 | * @new_length: The length to expand the file to | |
797 | * | |
798 | * Function to handle truncations modifying the size of the file. Note | |
799 | * that the file sizes are interpolated. When expanding, we are simply | |
800 | * writing strings of 0's out. When truncating, we need to modify the | |
801 | * underlying file size according to the page index interpolations. | |
802 | * | |
803 | * Returns zero on success; non-zero otherwise | |
804 | */ | |
805 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
806 | { | |
807 | int rc = 0; | |
808 | struct inode *inode = dentry->d_inode; | |
809 | struct dentry *lower_dentry; | |
810 | struct vfsmount *lower_mnt; | |
811 | struct file fake_ecryptfs_file, *lower_file = NULL; | |
812 | struct ecryptfs_crypt_stat *crypt_stat; | |
813 | loff_t i_size = i_size_read(inode); | |
814 | loff_t lower_size_before_truncate; | |
815 | loff_t lower_size_after_truncate; | |
816 | ||
817 | if (unlikely((new_length == i_size))) | |
818 | goto out; | |
819 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
820 | /* Set up a fake ecryptfs file, this is used to interface with | |
821 | * the file in the underlying filesystem so that the | |
822 | * truncation has an effect there as well. */ | |
823 | memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file)); | |
824 | fake_ecryptfs_file.f_dentry = dentry; | |
825 | /* Released at out_free: label */ | |
826 | ecryptfs_set_file_private(&fake_ecryptfs_file, | |
827 | kmem_cache_alloc(ecryptfs_file_info_cache, | |
828 | SLAB_KERNEL)); | |
829 | if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) { | |
830 | rc = -ENOMEM; | |
831 | goto out; | |
832 | } | |
833 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
834 | /* This dget & mntget is released through fput at out_fput: */ | |
835 | dget(lower_dentry); | |
836 | lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); | |
837 | mntget(lower_mnt); | |
838 | lower_file = dentry_open(lower_dentry, lower_mnt, O_RDWR); | |
839 | if (unlikely(IS_ERR(lower_file))) { | |
840 | rc = PTR_ERR(lower_file); | |
841 | goto out_free; | |
842 | } | |
843 | ecryptfs_set_file_lower(&fake_ecryptfs_file, lower_file); | |
844 | /* Switch on growing or shrinking file */ | |
845 | if (new_length > i_size) { | |
846 | rc = ecryptfs_fill_zeros(&fake_ecryptfs_file, new_length); | |
847 | if (rc) { | |
848 | ecryptfs_printk(KERN_ERR, | |
849 | "Problem with fill_zeros\n"); | |
850 | goto out_fput; | |
851 | } | |
852 | i_size_write(inode, new_length); | |
853 | rc = ecryptfs_write_inode_size_to_header(lower_file, | |
854 | lower_dentry->d_inode, | |
855 | inode); | |
856 | if (rc) { | |
857 | ecryptfs_printk(KERN_ERR, | |
858 | "Problem with ecryptfs_write" | |
859 | "_inode_size\n"); | |
860 | goto out_fput; | |
861 | } | |
862 | } else { /* new_length < i_size_read(inode) */ | |
863 | vmtruncate(inode, new_length); | |
864 | ecryptfs_write_inode_size_to_header(lower_file, | |
865 | lower_dentry->d_inode, | |
866 | inode); | |
867 | /* We are reducing the size of the ecryptfs file, and need to | |
868 | * know if we need to reduce the size of the lower file. */ | |
869 | lower_size_before_truncate = | |
870 | upper_size_to_lower_size(crypt_stat, i_size); | |
871 | lower_size_after_truncate = | |
872 | upper_size_to_lower_size(crypt_stat, new_length); | |
873 | if (lower_size_after_truncate < lower_size_before_truncate) | |
874 | vmtruncate(lower_dentry->d_inode, | |
875 | lower_size_after_truncate); | |
876 | } | |
877 | /* Update the access times */ | |
878 | lower_dentry->d_inode->i_mtime = lower_dentry->d_inode->i_ctime | |
879 | = CURRENT_TIME; | |
880 | mark_inode_dirty_sync(inode); | |
881 | out_fput: | |
882 | fput(lower_file); | |
883 | out_free: | |
884 | if (ecryptfs_file_to_private(&fake_ecryptfs_file)) | |
885 | kmem_cache_free(ecryptfs_file_info_cache, | |
886 | ecryptfs_file_to_private(&fake_ecryptfs_file)); | |
887 | out: | |
888 | return rc; | |
889 | } | |
890 | ||
891 | static int | |
892 | ecryptfs_permission(struct inode *inode, int mask, struct nameidata *nd) | |
893 | { | |
894 | int rc; | |
895 | ||
896 | if (nd) { | |
897 | struct vfsmount *vfsmnt_save = nd->mnt; | |
898 | struct dentry *dentry_save = nd->dentry; | |
899 | ||
900 | nd->mnt = ecryptfs_dentry_to_lower_mnt(nd->dentry); | |
901 | nd->dentry = ecryptfs_dentry_to_lower(nd->dentry); | |
902 | rc = permission(ecryptfs_inode_to_lower(inode), mask, nd); | |
903 | nd->mnt = vfsmnt_save; | |
904 | nd->dentry = dentry_save; | |
905 | } else | |
906 | rc = permission(ecryptfs_inode_to_lower(inode), mask, NULL); | |
907 | return rc; | |
908 | } | |
909 | ||
910 | /** | |
911 | * ecryptfs_setattr | |
912 | * @dentry: dentry handle to the inode to modify | |
913 | * @ia: Structure with flags of what to change and values | |
914 | * | |
915 | * Updates the metadata of an inode. If the update is to the size | |
916 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
917 | * of both the ecryptfs inode and the lower inode. | |
918 | * | |
919 | * All other metadata changes will be passed right to the lower filesystem, | |
920 | * and we will just update our inode to look like the lower. | |
921 | */ | |
922 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
923 | { | |
924 | int rc = 0; | |
925 | struct dentry *lower_dentry; | |
926 | struct inode *inode; | |
927 | struct inode *lower_inode; | |
928 | struct ecryptfs_crypt_stat *crypt_stat; | |
929 | ||
930 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
931 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
932 | inode = dentry->d_inode; | |
933 | lower_inode = ecryptfs_inode_to_lower(inode); | |
934 | if (ia->ia_valid & ATTR_SIZE) { | |
935 | ecryptfs_printk(KERN_DEBUG, | |
936 | "ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n", | |
937 | ia->ia_valid, ATTR_SIZE); | |
938 | rc = ecryptfs_truncate(dentry, ia->ia_size); | |
939 | /* ecryptfs_truncate handles resizing of the lower file */ | |
940 | ia->ia_valid &= ~ATTR_SIZE; | |
941 | ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [%x]\n", | |
942 | ia->ia_valid); | |
943 | if (rc < 0) | |
944 | goto out; | |
945 | } | |
946 | rc = notify_change(lower_dentry, ia); | |
947 | out: | |
948 | ecryptfs_copy_attr_all(inode, lower_inode); | |
949 | return rc; | |
950 | } | |
951 | ||
952 | static int | |
953 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, | |
954 | size_t size, int flags) | |
955 | { | |
956 | int rc = 0; | |
957 | struct dentry *lower_dentry; | |
958 | ||
959 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
960 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
961 | rc = -ENOSYS; | |
962 | goto out; | |
963 | } | |
964 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
965 | rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, | |
966 | size, flags); | |
967 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
968 | out: | |
969 | return rc; | |
970 | } | |
971 | ||
972 | static ssize_t | |
973 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, | |
974 | size_t size) | |
975 | { | |
976 | int rc = 0; | |
977 | struct dentry *lower_dentry; | |
978 | ||
979 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
980 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
981 | rc = -ENOSYS; | |
982 | goto out; | |
983 | } | |
984 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
985 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
986 | size); | |
987 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
988 | out: | |
989 | return rc; | |
990 | } | |
991 | ||
992 | static ssize_t | |
993 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
994 | { | |
995 | int rc = 0; | |
996 | struct dentry *lower_dentry; | |
997 | ||
998 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
999 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
1000 | rc = -ENOSYS; | |
1001 | goto out; | |
1002 | } | |
1003 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1004 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
1005 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1006 | out: | |
1007 | return rc; | |
1008 | } | |
1009 | ||
1010 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
1011 | { | |
1012 | int rc = 0; | |
1013 | struct dentry *lower_dentry; | |
1014 | ||
1015 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1016 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
1017 | rc = -ENOSYS; | |
1018 | goto out; | |
1019 | } | |
1020 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1021 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
1022 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1023 | out: | |
1024 | return rc; | |
1025 | } | |
1026 | ||
1027 | int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) | |
1028 | { | |
1029 | if ((ecryptfs_inode_to_lower(inode) | |
1030 | == (struct inode *)candidate_lower_inode)) | |
1031 | return 1; | |
1032 | else | |
1033 | return 0; | |
1034 | } | |
1035 | ||
1036 | int ecryptfs_inode_set(struct inode *inode, void *lower_inode) | |
1037 | { | |
1038 | ecryptfs_init_inode(inode, (struct inode *)lower_inode); | |
1039 | return 0; | |
1040 | } | |
1041 | ||
1042 | struct inode_operations ecryptfs_symlink_iops = { | |
1043 | .readlink = ecryptfs_readlink, | |
1044 | .follow_link = ecryptfs_follow_link, | |
1045 | .put_link = ecryptfs_put_link, | |
1046 | .permission = ecryptfs_permission, | |
1047 | .setattr = ecryptfs_setattr, | |
1048 | .setxattr = ecryptfs_setxattr, | |
1049 | .getxattr = ecryptfs_getxattr, | |
1050 | .listxattr = ecryptfs_listxattr, | |
1051 | .removexattr = ecryptfs_removexattr | |
1052 | }; | |
1053 | ||
1054 | struct inode_operations ecryptfs_dir_iops = { | |
1055 | .create = ecryptfs_create, | |
1056 | .lookup = ecryptfs_lookup, | |
1057 | .link = ecryptfs_link, | |
1058 | .unlink = ecryptfs_unlink, | |
1059 | .symlink = ecryptfs_symlink, | |
1060 | .mkdir = ecryptfs_mkdir, | |
1061 | .rmdir = ecryptfs_rmdir, | |
1062 | .mknod = ecryptfs_mknod, | |
1063 | .rename = ecryptfs_rename, | |
1064 | .permission = ecryptfs_permission, | |
1065 | .setattr = ecryptfs_setattr, | |
1066 | .setxattr = ecryptfs_setxattr, | |
1067 | .getxattr = ecryptfs_getxattr, | |
1068 | .listxattr = ecryptfs_listxattr, | |
1069 | .removexattr = ecryptfs_removexattr | |
1070 | }; | |
1071 | ||
1072 | struct inode_operations ecryptfs_main_iops = { | |
1073 | .permission = ecryptfs_permission, | |
1074 | .setattr = ecryptfs_setattr, | |
1075 | .setxattr = ecryptfs_setxattr, | |
1076 | .getxattr = ecryptfs_getxattr, | |
1077 | .listxattr = ecryptfs_listxattr, | |
1078 | .removexattr = ecryptfs_removexattr | |
1079 | }; |