]>
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> |
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); | |
908e0a8a | 41 | mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); |
237fead6 MH |
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) { | |
e2bd99ec MH |
164 | ecryptfs_inode_to_private(inode)->crypt_stat.flags |= |
165 | ECRYPTFS_SECURITY_WARNING; | |
237fead6 MH |
166 | ecryptfs_printk(KERN_WARNING, "Error attempting to fill zeros " |
167 | "in file; rc = [%d]\n", rc); | |
168 | goto out; | |
169 | } | |
170 | i_size_write(inode, 0); | |
ad5f1196 DM |
171 | rc = ecryptfs_write_inode_size_to_metadata(lower_file, lower_inode, |
172 | inode, ecryptfs_dentry, | |
173 | ECRYPTFS_LOWER_I_MUTEX_NOT_HELD); | |
e2bd99ec | 174 | ecryptfs_inode_to_private(inode)->crypt_stat.flags |= ECRYPTFS_NEW_FILE; |
237fead6 MH |
175 | out: |
176 | return rc; | |
177 | } | |
178 | ||
179 | /** | |
180 | * ecryptfs_initialize_file | |
181 | * | |
182 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
183 | * file with a header and first data page. | |
184 | * | |
185 | * Returns zero on success | |
186 | */ | |
187 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) | |
188 | { | |
189 | int rc = 0; | |
190 | int lower_flags; | |
191 | struct ecryptfs_crypt_stat *crypt_stat; | |
192 | struct dentry *lower_dentry; | |
237fead6 MH |
193 | struct file *lower_file; |
194 | struct inode *inode, *lower_inode; | |
195 | struct vfsmount *lower_mnt; | |
196 | ||
197 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
198 | ecryptfs_printk(KERN_DEBUG, "lower_dentry->d_name.name = [%s]\n", | |
199 | lower_dentry->d_name.name); | |
200 | inode = ecryptfs_dentry->d_inode; | |
201 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
70456600 | 202 | lower_flags = ((O_CREAT | O_TRUNC) & O_ACCMODE) | O_RDWR; |
237fead6 | 203 | lower_mnt = ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry); |
237fead6 | 204 | /* Corresponding fput() at end of this function */ |
7ff1d74f MH |
205 | if ((rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt, |
206 | lower_flags))) { | |
237fead6 MH |
207 | ecryptfs_printk(KERN_ERR, |
208 | "Error opening dentry; rc = [%i]\n", rc); | |
209 | goto out; | |
210 | } | |
7ff1d74f | 211 | lower_inode = lower_dentry->d_inode; |
237fead6 MH |
212 | if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { |
213 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); | |
e2bd99ec | 214 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
237fead6 MH |
215 | goto out_fput; |
216 | } | |
e2bd99ec | 217 | crypt_stat->flags |= ECRYPTFS_NEW_FILE; |
237fead6 MH |
218 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
219 | rc = ecryptfs_new_file_context(ecryptfs_dentry); | |
220 | if (rc) { | |
221 | ecryptfs_printk(KERN_DEBUG, "Error creating new file " | |
222 | "context\n"); | |
223 | goto out_fput; | |
224 | } | |
dd2a3b7a | 225 | rc = ecryptfs_write_metadata(ecryptfs_dentry, lower_file); |
237fead6 MH |
226 | if (rc) { |
227 | ecryptfs_printk(KERN_DEBUG, "Error writing headers\n"); | |
228 | goto out_fput; | |
229 | } | |
230 | rc = grow_file(ecryptfs_dentry, lower_file, inode, lower_inode); | |
231 | out_fput: | |
7ff1d74f MH |
232 | if ((rc = ecryptfs_close_lower_file(lower_file))) |
233 | printk(KERN_ERR "Error closing lower_file\n"); | |
237fead6 MH |
234 | out: |
235 | return rc; | |
236 | } | |
237 | ||
238 | /** | |
239 | * ecryptfs_create | |
240 | * @dir: The inode of the directory in which to create the file. | |
241 | * @dentry: The eCryptfs dentry | |
242 | * @mode: The mode of the new file. | |
243 | * @nd: nameidata | |
244 | * | |
245 | * Creates a new file. | |
246 | * | |
247 | * Returns zero on success; non-zero on error condition | |
248 | */ | |
249 | static int | |
250 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
251 | int mode, struct nameidata *nd) | |
252 | { | |
253 | int rc; | |
254 | ||
255 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); | |
256 | if (unlikely(rc)) { | |
257 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" | |
258 | "lower filesystem\n"); | |
259 | goto out; | |
260 | } | |
261 | /* At this point, a file exists on "disk"; we need to make sure | |
262 | * that this on disk file is prepared to be an ecryptfs file */ | |
263 | rc = ecryptfs_initialize_file(ecryptfs_dentry); | |
264 | out: | |
265 | return rc; | |
266 | } | |
267 | ||
268 | /** | |
269 | * ecryptfs_lookup | |
270 | * @dir: inode | |
271 | * @dentry: The dentry | |
272 | * @nd: nameidata, may be NULL | |
273 | * | |
274 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
275 | * dentry cache and continue on to read it from the disk. | |
276 | */ | |
277 | static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, | |
278 | struct nameidata *nd) | |
279 | { | |
280 | int rc = 0; | |
281 | struct dentry *lower_dir_dentry; | |
282 | struct dentry *lower_dentry; | |
283 | struct vfsmount *lower_mnt; | |
237fead6 | 284 | char *encoded_name; |
c381bfcf | 285 | int encoded_namelen; |
237fead6 | 286 | struct ecryptfs_crypt_stat *crypt_stat = NULL; |
e77a56dd | 287 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
237fead6 MH |
288 | char *page_virt = NULL; |
289 | struct inode *lower_inode; | |
290 | u64 file_size; | |
291 | ||
292 | lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); | |
293 | dentry->d_op = &ecryptfs_dops; | |
294 | if ((dentry->d_name.len == 1 && !strcmp(dentry->d_name.name, ".")) | |
45ec4aba MH |
295 | || (dentry->d_name.len == 2 |
296 | && !strcmp(dentry->d_name.name, ".."))) { | |
297 | d_drop(dentry); | |
298 | goto out; | |
299 | } | |
237fead6 MH |
300 | encoded_namelen = ecryptfs_encode_filename(crypt_stat, |
301 | dentry->d_name.name, | |
302 | dentry->d_name.len, | |
303 | &encoded_name); | |
304 | if (encoded_namelen < 0) { | |
305 | rc = encoded_namelen; | |
45ec4aba MH |
306 | d_drop(dentry); |
307 | goto out; | |
237fead6 MH |
308 | } |
309 | ecryptfs_printk(KERN_DEBUG, "encoded_name = [%s]; encoded_namelen " | |
310 | "= [%d]\n", encoded_name, encoded_namelen); | |
311 | lower_dentry = lookup_one_len(encoded_name, lower_dir_dentry, | |
312 | encoded_namelen - 1); | |
313 | kfree(encoded_name); | |
237fead6 MH |
314 | if (IS_ERR(lower_dentry)) { |
315 | ecryptfs_printk(KERN_ERR, "ERR from lower_dentry\n"); | |
316 | rc = PTR_ERR(lower_dentry); | |
45ec4aba MH |
317 | d_drop(dentry); |
318 | goto out; | |
237fead6 | 319 | } |
45ec4aba | 320 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); |
237fead6 MH |
321 | ecryptfs_printk(KERN_DEBUG, "lower_dentry = [%p]; lower_dentry->" |
322 | "d_name.name = [%s]\n", lower_dentry, | |
323 | lower_dentry->d_name.name); | |
324 | lower_inode = lower_dentry->d_inode; | |
0cc72dc7 | 325 | fsstack_copy_attr_atime(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
326 | BUG_ON(!atomic_read(&lower_dentry->d_count)); |
327 | ecryptfs_set_dentry_private(dentry, | |
328 | kmem_cache_alloc(ecryptfs_dentry_info_cache, | |
e94b1766 | 329 | GFP_KERNEL)); |
237fead6 MH |
330 | if (!ecryptfs_dentry_to_private(dentry)) { |
331 | rc = -ENOMEM; | |
332 | ecryptfs_printk(KERN_ERR, "Out of memory whilst attempting " | |
333 | "to allocate ecryptfs_dentry_info struct\n"); | |
334 | goto out_dput; | |
335 | } | |
336 | ecryptfs_set_dentry_lower(dentry, lower_dentry); | |
337 | ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); | |
338 | if (!lower_dentry->d_inode) { | |
339 | /* We want to add because we couldn't find in lower */ | |
340 | d_add(dentry, NULL); | |
341 | goto out; | |
342 | } | |
343 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 1); | |
344 | if (rc) { | |
345 | ecryptfs_printk(KERN_ERR, "Error interposing\n"); | |
346 | goto out_dput; | |
347 | } | |
348 | if (S_ISDIR(lower_inode->i_mode)) { | |
349 | ecryptfs_printk(KERN_DEBUG, "Is a directory; returning\n"); | |
350 | goto out; | |
351 | } | |
352 | if (S_ISLNK(lower_inode->i_mode)) { | |
353 | ecryptfs_printk(KERN_DEBUG, "Is a symlink; returning\n"); | |
354 | goto out; | |
355 | } | |
202a21d6 RK |
356 | if (special_file(lower_inode->i_mode)) { |
357 | ecryptfs_printk(KERN_DEBUG, "Is a special file; returning\n"); | |
358 | goto out; | |
359 | } | |
237fead6 MH |
360 | if (!nd) { |
361 | ecryptfs_printk(KERN_DEBUG, "We have a NULL nd, just leave" | |
362 | "as we *think* we are about to unlink\n"); | |
363 | goto out; | |
364 | } | |
237fead6 | 365 | /* Released in this function */ |
c3762229 | 366 | page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, |
dd2a3b7a | 367 | GFP_USER); |
237fead6 MH |
368 | if (!page_virt) { |
369 | rc = -ENOMEM; | |
370 | ecryptfs_printk(KERN_ERR, | |
371 | "Cannot ecryptfs_kmalloc a page\n"); | |
372 | goto out_dput; | |
373 | } | |
237fead6 | 374 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
e2bd99ec | 375 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) |
237fead6 | 376 | ecryptfs_set_default_sizes(crypt_stat); |
dd2a3b7a MH |
377 | rc = ecryptfs_read_and_validate_header_region(page_virt, lower_dentry, |
378 | nd->mnt); | |
237fead6 | 379 | if (rc) { |
dd2a3b7a MH |
380 | rc = ecryptfs_read_and_validate_xattr_region(page_virt, dentry); |
381 | if (rc) { | |
382 | printk(KERN_DEBUG "Valid metadata not found in header " | |
383 | "region or xattr region; treating file as " | |
384 | "unencrypted\n"); | |
385 | rc = 0; | |
237fead6 MH |
386 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
387 | goto out; | |
388 | } | |
dd2a3b7a | 389 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
237fead6 | 390 | } |
e77a56dd MH |
391 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
392 | dentry->d_sb)->mount_crypt_stat; | |
393 | if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { | |
394 | if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) | |
395 | file_size = (crypt_stat->header_extent_size | |
396 | + i_size_read(lower_dentry->d_inode)); | |
397 | else | |
398 | file_size = i_size_read(lower_dentry->d_inode); | |
399 | } else { | |
400 | memcpy(&file_size, page_virt, sizeof(file_size)); | |
401 | file_size = be64_to_cpu(file_size); | |
402 | } | |
dd2a3b7a | 403 | i_size_write(dentry->d_inode, (loff_t)file_size); |
237fead6 MH |
404 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
405 | goto out; | |
406 | ||
407 | out_dput: | |
408 | dput(lower_dentry); | |
237fead6 MH |
409 | d_drop(dentry); |
410 | out: | |
411 | return ERR_PTR(rc); | |
412 | } | |
413 | ||
414 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
415 | struct dentry *new_dentry) | |
416 | { | |
417 | struct dentry *lower_old_dentry; | |
418 | struct dentry *lower_new_dentry; | |
419 | struct dentry *lower_dir_dentry; | |
420 | u64 file_size_save; | |
421 | int rc; | |
422 | ||
423 | file_size_save = i_size_read(old_dentry->d_inode); | |
424 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
425 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
426 | dget(lower_old_dentry); | |
427 | dget(lower_new_dentry); | |
428 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
429 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
430 | lower_new_dentry); | |
431 | if (rc || !lower_new_dentry->d_inode) | |
432 | goto out_lock; | |
433 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); | |
434 | if (rc) | |
435 | goto out_lock; | |
0cc72dc7 JJS |
436 | fsstack_copy_attr_times(dir, lower_new_dentry->d_inode); |
437 | fsstack_copy_inode_size(dir, lower_new_dentry->d_inode); | |
237fead6 MH |
438 | old_dentry->d_inode->i_nlink = |
439 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; | |
440 | i_size_write(new_dentry->d_inode, file_size_save); | |
441 | out_lock: | |
442 | unlock_dir(lower_dir_dentry); | |
443 | dput(lower_new_dentry); | |
444 | dput(lower_old_dentry); | |
ae56fb16 | 445 | d_drop(lower_old_dentry); |
45ec4aba MH |
446 | d_drop(new_dentry); |
447 | d_drop(old_dentry); | |
237fead6 MH |
448 | return rc; |
449 | } | |
450 | ||
451 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
452 | { | |
453 | int rc = 0; | |
454 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
455 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
456 | ||
457 | lock_parent(lower_dentry); | |
458 | rc = vfs_unlink(lower_dir_inode, lower_dentry); | |
459 | if (rc) { | |
ae56fb16 | 460 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
461 | goto out_unlock; |
462 | } | |
0cc72dc7 | 463 | fsstack_copy_attr_times(dir, lower_dir_inode); |
237fead6 MH |
464 | dentry->d_inode->i_nlink = |
465 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; | |
466 | dentry->d_inode->i_ctime = dir->i_ctime; | |
467 | out_unlock: | |
468 | unlock_parent(lower_dentry); | |
469 | return rc; | |
470 | } | |
471 | ||
472 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
473 | const char *symname) | |
474 | { | |
475 | int rc; | |
476 | struct dentry *lower_dentry; | |
477 | struct dentry *lower_dir_dentry; | |
478 | umode_t mode; | |
479 | char *encoded_symname; | |
c381bfcf | 480 | int encoded_symlen; |
237fead6 MH |
481 | struct ecryptfs_crypt_stat *crypt_stat = NULL; |
482 | ||
483 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
484 | dget(lower_dentry); | |
485 | lower_dir_dentry = lock_parent(lower_dentry); | |
486 | mode = S_IALLUGO; | |
487 | encoded_symlen = ecryptfs_encode_filename(crypt_stat, symname, | |
488 | strlen(symname), | |
489 | &encoded_symname); | |
490 | if (encoded_symlen < 0) { | |
491 | rc = encoded_symlen; | |
492 | goto out_lock; | |
493 | } | |
494 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, | |
495 | encoded_symname, mode); | |
496 | kfree(encoded_symname); | |
497 | if (rc || !lower_dentry->d_inode) | |
498 | goto out_lock; | |
499 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
500 | if (rc) | |
501 | goto out_lock; | |
0cc72dc7 JJS |
502 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
503 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
504 | out_lock: |
505 | unlock_dir(lower_dir_dentry); | |
506 | dput(lower_dentry); | |
507 | if (!dentry->d_inode) | |
508 | d_drop(dentry); | |
509 | return rc; | |
510 | } | |
511 | ||
512 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
513 | { | |
514 | int rc; | |
515 | struct dentry *lower_dentry; | |
516 | struct dentry *lower_dir_dentry; | |
517 | ||
518 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
519 | lower_dir_dentry = lock_parent(lower_dentry); | |
520 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
521 | if (rc || !lower_dentry->d_inode) | |
522 | goto out; | |
523 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
524 | if (rc) | |
525 | goto out; | |
0cc72dc7 JJS |
526 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
527 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
528 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
529 | out: | |
530 | unlock_dir(lower_dir_dentry); | |
531 | if (!dentry->d_inode) | |
532 | d_drop(dentry); | |
533 | return rc; | |
534 | } | |
535 | ||
536 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
537 | { | |
237fead6 | 538 | struct dentry *lower_dentry; |
237fead6 | 539 | struct dentry *lower_dir_dentry; |
45ec4aba | 540 | int rc; |
237fead6 MH |
541 | |
542 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 543 | dget(dentry); |
237fead6 | 544 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 545 | dget(lower_dentry); |
237fead6 | 546 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba MH |
547 | dput(lower_dentry); |
548 | if (!rc) | |
549 | d_delete(lower_dentry); | |
0cc72dc7 | 550 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
551 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
552 | unlock_dir(lower_dir_dentry); | |
553 | if (!rc) | |
554 | d_drop(dentry); | |
45ec4aba | 555 | dput(dentry); |
237fead6 MH |
556 | return rc; |
557 | } | |
558 | ||
559 | static int | |
560 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
561 | { | |
562 | int rc; | |
563 | struct dentry *lower_dentry; | |
564 | struct dentry *lower_dir_dentry; | |
565 | ||
566 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
567 | lower_dir_dentry = lock_parent(lower_dentry); | |
568 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
569 | if (rc || !lower_dentry->d_inode) | |
570 | goto out; | |
571 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
572 | if (rc) | |
573 | goto out; | |
0cc72dc7 JJS |
574 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
575 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
576 | out: |
577 | unlock_dir(lower_dir_dentry); | |
578 | if (!dentry->d_inode) | |
579 | d_drop(dentry); | |
580 | return rc; | |
581 | } | |
582 | ||
583 | static int | |
584 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
585 | struct inode *new_dir, struct dentry *new_dentry) | |
586 | { | |
587 | int rc; | |
588 | struct dentry *lower_old_dentry; | |
589 | struct dentry *lower_new_dentry; | |
590 | struct dentry *lower_old_dir_dentry; | |
591 | struct dentry *lower_new_dir_dentry; | |
592 | ||
593 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
594 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
595 | dget(lower_old_dentry); | |
596 | dget(lower_new_dentry); | |
597 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
598 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
599 | lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
600 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, | |
601 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
602 | if (rc) | |
603 | goto out_lock; | |
0cc72dc7 | 604 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode, NULL); |
237fead6 | 605 | if (new_dir != old_dir) |
0cc72dc7 | 606 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode, NULL); |
237fead6 MH |
607 | out_lock: |
608 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
a9083081 MH |
609 | dput(lower_new_dentry->d_parent); |
610 | dput(lower_old_dentry->d_parent); | |
237fead6 MH |
611 | dput(lower_new_dentry); |
612 | dput(lower_old_dentry); | |
613 | return rc; | |
614 | } | |
615 | ||
616 | static int | |
617 | ecryptfs_readlink(struct dentry *dentry, char __user * buf, int bufsiz) | |
618 | { | |
619 | int rc; | |
620 | struct dentry *lower_dentry; | |
621 | char *decoded_name; | |
622 | char *lower_buf; | |
623 | mm_segment_t old_fs; | |
624 | struct ecryptfs_crypt_stat *crypt_stat; | |
625 | ||
626 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
627 | if (!lower_dentry->d_inode->i_op || | |
628 | !lower_dentry->d_inode->i_op->readlink) { | |
629 | rc = -EINVAL; | |
630 | goto out; | |
631 | } | |
632 | /* Released in this function */ | |
633 | lower_buf = kmalloc(bufsiz, GFP_KERNEL); | |
634 | if (lower_buf == NULL) { | |
635 | ecryptfs_printk(KERN_ERR, "Out of memory\n"); | |
636 | rc = -ENOMEM; | |
637 | goto out; | |
638 | } | |
639 | old_fs = get_fs(); | |
640 | set_fs(get_ds()); | |
641 | ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " | |
642 | "lower_dentry->d_name.name = [%s]\n", | |
643 | lower_dentry->d_name.name); | |
644 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, | |
645 | (char __user *)lower_buf, | |
646 | bufsiz); | |
647 | set_fs(old_fs); | |
648 | if (rc >= 0) { | |
649 | crypt_stat = NULL; | |
650 | rc = ecryptfs_decode_filename(crypt_stat, lower_buf, rc, | |
651 | &decoded_name); | |
652 | if (rc == -ENOMEM) | |
653 | goto out_free_lower_buf; | |
654 | if (rc > 0) { | |
655 | ecryptfs_printk(KERN_DEBUG, "Copying [%d] bytes " | |
656 | "to userspace: [%*s]\n", rc, | |
657 | decoded_name); | |
658 | if (copy_to_user(buf, decoded_name, rc)) | |
659 | rc = -EFAULT; | |
660 | } | |
661 | kfree(decoded_name); | |
0cc72dc7 JJS |
662 | fsstack_copy_attr_atime(dentry->d_inode, |
663 | lower_dentry->d_inode); | |
237fead6 MH |
664 | } |
665 | out_free_lower_buf: | |
666 | kfree(lower_buf); | |
667 | out: | |
668 | return rc; | |
669 | } | |
670 | ||
671 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
672 | { | |
673 | char *buf; | |
674 | int len = PAGE_SIZE, rc; | |
675 | mm_segment_t old_fs; | |
676 | ||
677 | /* Released in ecryptfs_put_link(); only release here on error */ | |
678 | buf = kmalloc(len, GFP_KERNEL); | |
679 | if (!buf) { | |
680 | rc = -ENOMEM; | |
681 | goto out; | |
682 | } | |
683 | old_fs = get_fs(); | |
684 | set_fs(get_ds()); | |
685 | ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " | |
686 | "dentry->d_name.name = [%s]\n", dentry->d_name.name); | |
687 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); | |
688 | buf[rc] = '\0'; | |
689 | set_fs(old_fs); | |
690 | if (rc < 0) | |
691 | goto out_free; | |
692 | rc = 0; | |
693 | nd_set_link(nd, buf); | |
694 | goto out; | |
695 | out_free: | |
696 | kfree(buf); | |
697 | out: | |
698 | return ERR_PTR(rc); | |
699 | } | |
700 | ||
701 | static void | |
702 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
703 | { | |
704 | /* Free the char* */ | |
705 | kfree(nd_get_link(nd)); | |
706 | } | |
707 | ||
708 | /** | |
709 | * upper_size_to_lower_size | |
710 | * @crypt_stat: Crypt_stat associated with file | |
711 | * @upper_size: Size of the upper file | |
712 | * | |
713 | * Calculate the requried size of the lower file based on the | |
714 | * specified size of the upper file. This calculation is based on the | |
715 | * number of headers in the underlying file and the extent size. | |
716 | * | |
717 | * Returns Calculated size of the lower file. | |
718 | */ | |
719 | static loff_t | |
720 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
721 | loff_t upper_size) | |
722 | { | |
723 | loff_t lower_size; | |
724 | ||
725 | lower_size = ( crypt_stat->header_extent_size | |
726 | * crypt_stat->num_header_extents_at_front ); | |
727 | if (upper_size != 0) { | |
728 | loff_t num_extents; | |
729 | ||
730 | num_extents = upper_size >> crypt_stat->extent_shift; | |
731 | if (upper_size & ~crypt_stat->extent_mask) | |
732 | num_extents++; | |
733 | lower_size += (num_extents * crypt_stat->extent_size); | |
734 | } | |
735 | return lower_size; | |
736 | } | |
737 | ||
738 | /** | |
739 | * ecryptfs_truncate | |
740 | * @dentry: The ecryptfs layer dentry | |
741 | * @new_length: The length to expand the file to | |
742 | * | |
743 | * Function to handle truncations modifying the size of the file. Note | |
744 | * that the file sizes are interpolated. When expanding, we are simply | |
745 | * writing strings of 0's out. When truncating, we need to modify the | |
746 | * underlying file size according to the page index interpolations. | |
747 | * | |
748 | * Returns zero on success; non-zero otherwise | |
749 | */ | |
750 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
751 | { | |
752 | int rc = 0; | |
753 | struct inode *inode = dentry->d_inode; | |
754 | struct dentry *lower_dentry; | |
755 | struct vfsmount *lower_mnt; | |
756 | struct file fake_ecryptfs_file, *lower_file = NULL; | |
757 | struct ecryptfs_crypt_stat *crypt_stat; | |
758 | loff_t i_size = i_size_read(inode); | |
759 | loff_t lower_size_before_truncate; | |
760 | loff_t lower_size_after_truncate; | |
761 | ||
762 | if (unlikely((new_length == i_size))) | |
763 | goto out; | |
764 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
765 | /* Set up a fake ecryptfs file, this is used to interface with | |
766 | * the file in the underlying filesystem so that the | |
767 | * truncation has an effect there as well. */ | |
768 | memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file)); | |
bd243a4b | 769 | fake_ecryptfs_file.f_path.dentry = dentry; |
237fead6 MH |
770 | /* Released at out_free: label */ |
771 | ecryptfs_set_file_private(&fake_ecryptfs_file, | |
772 | kmem_cache_alloc(ecryptfs_file_info_cache, | |
e94b1766 | 773 | GFP_KERNEL)); |
237fead6 MH |
774 | if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) { |
775 | rc = -ENOMEM; | |
776 | goto out; | |
777 | } | |
778 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
779 | /* This dget & mntget is released through fput at out_fput: */ | |
237fead6 | 780 | lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); |
7ff1d74f MH |
781 | if ((rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt, |
782 | O_RDWR))) { | |
783 | ecryptfs_printk(KERN_ERR, | |
784 | "Error opening dentry; rc = [%i]\n", rc); | |
237fead6 MH |
785 | goto out_free; |
786 | } | |
787 | ecryptfs_set_file_lower(&fake_ecryptfs_file, lower_file); | |
788 | /* Switch on growing or shrinking file */ | |
789 | if (new_length > i_size) { | |
790 | rc = ecryptfs_fill_zeros(&fake_ecryptfs_file, new_length); | |
791 | if (rc) { | |
792 | ecryptfs_printk(KERN_ERR, | |
793 | "Problem with fill_zeros\n"); | |
794 | goto out_fput; | |
795 | } | |
796 | i_size_write(inode, new_length); | |
dd2a3b7a MH |
797 | rc = ecryptfs_write_inode_size_to_metadata( |
798 | lower_file, lower_dentry->d_inode, inode, dentry, | |
799 | ECRYPTFS_LOWER_I_MUTEX_NOT_HELD); | |
237fead6 | 800 | if (rc) { |
dd2a3b7a MH |
801 | printk(KERN_ERR "Problem with " |
802 | "ecryptfs_write_inode_size_to_metadata; " | |
803 | "rc = [%d]\n", rc); | |
237fead6 MH |
804 | goto out_fput; |
805 | } | |
806 | } else { /* new_length < i_size_read(inode) */ | |
240e2df5 MH |
807 | pgoff_t index = 0; |
808 | int end_pos_in_page = -1; | |
809 | ||
810 | if (new_length != 0) { | |
811 | index = ((new_length - 1) >> PAGE_CACHE_SHIFT); | |
812 | end_pos_in_page = ((new_length - 1) & ~PAGE_CACHE_MASK); | |
813 | } | |
814 | if (end_pos_in_page != (PAGE_CACHE_SIZE - 1)) { | |
815 | if ((rc = ecryptfs_write_zeros(&fake_ecryptfs_file, | |
816 | index, | |
817 | (end_pos_in_page + 1), | |
818 | ((PAGE_CACHE_SIZE - 1) | |
819 | - end_pos_in_page)))) { | |
820 | printk(KERN_ERR "Error attempting to zero out " | |
821 | "the remainder of the end page on " | |
822 | "reducing truncate; rc = [%d]\n", rc); | |
823 | goto out_fput; | |
824 | } | |
825 | } | |
237fead6 | 826 | vmtruncate(inode, new_length); |
dd2a3b7a MH |
827 | rc = ecryptfs_write_inode_size_to_metadata( |
828 | lower_file, lower_dentry->d_inode, inode, dentry, | |
829 | ECRYPTFS_LOWER_I_MUTEX_NOT_HELD); | |
830 | if (rc) { | |
831 | printk(KERN_ERR "Problem with " | |
832 | "ecryptfs_write_inode_size_to_metadata; " | |
833 | "rc = [%d]\n", rc); | |
834 | goto out_fput; | |
835 | } | |
237fead6 MH |
836 | /* We are reducing the size of the ecryptfs file, and need to |
837 | * know if we need to reduce the size of the lower file. */ | |
838 | lower_size_before_truncate = | |
839 | upper_size_to_lower_size(crypt_stat, i_size); | |
840 | lower_size_after_truncate = | |
841 | upper_size_to_lower_size(crypt_stat, new_length); | |
842 | if (lower_size_after_truncate < lower_size_before_truncate) | |
843 | vmtruncate(lower_dentry->d_inode, | |
844 | lower_size_after_truncate); | |
845 | } | |
846 | /* Update the access times */ | |
847 | lower_dentry->d_inode->i_mtime = lower_dentry->d_inode->i_ctime | |
848 | = CURRENT_TIME; | |
849 | mark_inode_dirty_sync(inode); | |
850 | out_fput: | |
7ff1d74f MH |
851 | if ((rc = ecryptfs_close_lower_file(lower_file))) |
852 | printk(KERN_ERR "Error closing lower_file\n"); | |
237fead6 MH |
853 | out_free: |
854 | if (ecryptfs_file_to_private(&fake_ecryptfs_file)) | |
855 | kmem_cache_free(ecryptfs_file_info_cache, | |
856 | ecryptfs_file_to_private(&fake_ecryptfs_file)); | |
857 | out: | |
858 | return rc; | |
859 | } | |
860 | ||
861 | static int | |
862 | ecryptfs_permission(struct inode *inode, int mask, struct nameidata *nd) | |
863 | { | |
864 | int rc; | |
865 | ||
866 | if (nd) { | |
867 | struct vfsmount *vfsmnt_save = nd->mnt; | |
868 | struct dentry *dentry_save = nd->dentry; | |
869 | ||
870 | nd->mnt = ecryptfs_dentry_to_lower_mnt(nd->dentry); | |
871 | nd->dentry = ecryptfs_dentry_to_lower(nd->dentry); | |
872 | rc = permission(ecryptfs_inode_to_lower(inode), mask, nd); | |
873 | nd->mnt = vfsmnt_save; | |
874 | nd->dentry = dentry_save; | |
875 | } else | |
876 | rc = permission(ecryptfs_inode_to_lower(inode), mask, NULL); | |
877 | return rc; | |
878 | } | |
879 | ||
880 | /** | |
881 | * ecryptfs_setattr | |
882 | * @dentry: dentry handle to the inode to modify | |
883 | * @ia: Structure with flags of what to change and values | |
884 | * | |
885 | * Updates the metadata of an inode. If the update is to the size | |
886 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
887 | * of both the ecryptfs inode and the lower inode. | |
888 | * | |
889 | * All other metadata changes will be passed right to the lower filesystem, | |
890 | * and we will just update our inode to look like the lower. | |
891 | */ | |
892 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
893 | { | |
894 | int rc = 0; | |
895 | struct dentry *lower_dentry; | |
896 | struct inode *inode; | |
897 | struct inode *lower_inode; | |
898 | struct ecryptfs_crypt_stat *crypt_stat; | |
899 | ||
900 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
901 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
902 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
903 | inode = dentry->d_inode; |
904 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
905 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
906 | mutex_lock(&crypt_stat->cs_mutex); | |
907 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
908 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
909 | else if (S_ISREG(dentry->d_inode->i_mode) |
910 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
911 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b MH |
912 | struct vfsmount *lower_mnt; |
913 | struct file *lower_file = NULL; | |
914 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; | |
915 | int lower_flags; | |
916 | ||
917 | lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); | |
918 | lower_flags = O_RDONLY; | |
919 | if ((rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, | |
920 | lower_mnt, lower_flags))) { | |
921 | printk(KERN_ERR | |
922 | "Error opening lower file; rc = [%d]\n", rc); | |
923 | mutex_unlock(&crypt_stat->cs_mutex); | |
924 | goto out; | |
925 | } | |
926 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
927 | dentry->d_sb)->mount_crypt_stat; | |
928 | if ((rc = ecryptfs_read_metadata(dentry, lower_file))) { | |
929 | if (!(mount_crypt_stat->flags | |
930 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
931 | rc = -EIO; | |
932 | printk(KERN_WARNING "Attempt to read file that " | |
933 | "is not in a valid eCryptfs format, " | |
934 | "and plaintext passthrough mode is not " | |
935 | "enabled; returning -EIO\n"); | |
936 | ||
937 | mutex_unlock(&crypt_stat->cs_mutex); | |
938 | fput(lower_file); | |
939 | goto out; | |
940 | } | |
941 | rc = 0; | |
942 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
943 | mutex_unlock(&crypt_stat->cs_mutex); | |
944 | fput(lower_file); | |
945 | goto out; | |
946 | } | |
947 | fput(lower_file); | |
948 | } | |
949 | mutex_unlock(&crypt_stat->cs_mutex); | |
237fead6 MH |
950 | if (ia->ia_valid & ATTR_SIZE) { |
951 | ecryptfs_printk(KERN_DEBUG, | |
952 | "ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n", | |
953 | ia->ia_valid, ATTR_SIZE); | |
954 | rc = ecryptfs_truncate(dentry, ia->ia_size); | |
955 | /* ecryptfs_truncate handles resizing of the lower file */ | |
956 | ia->ia_valid &= ~ATTR_SIZE; | |
957 | ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [%x]\n", | |
958 | ia->ia_valid); | |
959 | if (rc < 0) | |
960 | goto out; | |
961 | } | |
962 | rc = notify_change(lower_dentry, ia); | |
963 | out: | |
0cc72dc7 | 964 | fsstack_copy_attr_all(inode, lower_inode, NULL); |
237fead6 MH |
965 | return rc; |
966 | } | |
967 | ||
dd2a3b7a | 968 | int |
237fead6 MH |
969 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
970 | size_t size, int flags) | |
971 | { | |
972 | int rc = 0; | |
973 | struct dentry *lower_dentry; | |
974 | ||
975 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
976 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
977 | rc = -ENOSYS; | |
978 | goto out; | |
979 | } | |
980 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
981 | rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, | |
982 | size, flags); | |
983 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
984 | out: | |
985 | return rc; | |
986 | } | |
987 | ||
dd2a3b7a | 988 | ssize_t |
237fead6 MH |
989 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
990 | size_t size) | |
991 | { | |
992 | int rc = 0; | |
993 | struct dentry *lower_dentry; | |
994 | ||
995 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
996 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
997 | rc = -ENOSYS; | |
998 | goto out; | |
999 | } | |
1000 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1001 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
1002 | size); | |
1003 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1004 | out: | |
1005 | return rc; | |
1006 | } | |
1007 | ||
1008 | static ssize_t | |
1009 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1010 | { | |
1011 | int rc = 0; | |
1012 | struct dentry *lower_dentry; | |
1013 | ||
1014 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1015 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
1016 | rc = -ENOSYS; | |
1017 | goto out; | |
1018 | } | |
1019 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1020 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
1021 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1022 | out: | |
1023 | return rc; | |
1024 | } | |
1025 | ||
1026 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
1027 | { | |
1028 | int rc = 0; | |
1029 | struct dentry *lower_dentry; | |
1030 | ||
1031 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1032 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
1033 | rc = -ENOSYS; | |
1034 | goto out; | |
1035 | } | |
1036 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1037 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
1038 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1039 | out: | |
1040 | return rc; | |
1041 | } | |
1042 | ||
1043 | int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) | |
1044 | { | |
1045 | if ((ecryptfs_inode_to_lower(inode) | |
1046 | == (struct inode *)candidate_lower_inode)) | |
1047 | return 1; | |
1048 | else | |
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | int ecryptfs_inode_set(struct inode *inode, void *lower_inode) | |
1053 | { | |
1054 | ecryptfs_init_inode(inode, (struct inode *)lower_inode); | |
1055 | return 0; | |
1056 | } | |
1057 | ||
754661f1 | 1058 | const struct inode_operations ecryptfs_symlink_iops = { |
237fead6 MH |
1059 | .readlink = ecryptfs_readlink, |
1060 | .follow_link = ecryptfs_follow_link, | |
1061 | .put_link = ecryptfs_put_link, | |
1062 | .permission = ecryptfs_permission, | |
1063 | .setattr = ecryptfs_setattr, | |
1064 | .setxattr = ecryptfs_setxattr, | |
1065 | .getxattr = ecryptfs_getxattr, | |
1066 | .listxattr = ecryptfs_listxattr, | |
1067 | .removexattr = ecryptfs_removexattr | |
1068 | }; | |
1069 | ||
754661f1 | 1070 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1071 | .create = ecryptfs_create, |
1072 | .lookup = ecryptfs_lookup, | |
1073 | .link = ecryptfs_link, | |
1074 | .unlink = ecryptfs_unlink, | |
1075 | .symlink = ecryptfs_symlink, | |
1076 | .mkdir = ecryptfs_mkdir, | |
1077 | .rmdir = ecryptfs_rmdir, | |
1078 | .mknod = ecryptfs_mknod, | |
1079 | .rename = ecryptfs_rename, | |
1080 | .permission = ecryptfs_permission, | |
1081 | .setattr = ecryptfs_setattr, | |
1082 | .setxattr = ecryptfs_setxattr, | |
1083 | .getxattr = ecryptfs_getxattr, | |
1084 | .listxattr = ecryptfs_listxattr, | |
1085 | .removexattr = ecryptfs_removexattr | |
1086 | }; | |
1087 | ||
754661f1 | 1088 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1089 | .permission = ecryptfs_permission, |
1090 | .setattr = ecryptfs_setattr, | |
1091 | .setxattr = ecryptfs_setxattr, | |
1092 | .getxattr = ecryptfs_getxattr, | |
1093 | .listxattr = ecryptfs_listxattr, | |
1094 | .removexattr = ecryptfs_removexattr | |
1095 | }; |