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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); | |
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); | |
4981e081 | 122 | if (rc) { |
caeeeecf MH |
123 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
124 | "rc = [%d]\n", __FUNCTION__, rc); | |
125 | goto out_lock; | |
237fead6 MH |
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 | |
d7cdc5fe | 143 | * @ecryptfs_dentry: the eCryptfs dentry |
237fead6 MH |
144 | * |
145 | * This is the code which will grow the file to its correct size. | |
146 | */ | |
d7cdc5fe | 147 | static int grow_file(struct dentry *ecryptfs_dentry) |
237fead6 | 148 | { |
d7cdc5fe | 149 | struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode; |
237fead6 MH |
150 | struct file fake_file; |
151 | struct ecryptfs_file_info tmp_file_info; | |
d7cdc5fe MH |
152 | char zero_virt[] = { 0x00 }; |
153 | int rc = 0; | |
237fead6 MH |
154 | |
155 | memset(&fake_file, 0, sizeof(fake_file)); | |
bd243a4b | 156 | fake_file.f_path.dentry = ecryptfs_dentry; |
237fead6 MH |
157 | memset(&tmp_file_info, 0, sizeof(tmp_file_info)); |
158 | ecryptfs_set_file_private(&fake_file, &tmp_file_info); | |
d7cdc5fe MH |
159 | ecryptfs_set_file_lower( |
160 | &fake_file, | |
161 | ecryptfs_inode_to_private(ecryptfs_inode)->lower_file); | |
162 | rc = ecryptfs_write(&fake_file, zero_virt, 0, 1); | |
163 | i_size_write(ecryptfs_inode, 0); | |
164 | rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode); | |
165 | ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |= | |
166 | ECRYPTFS_NEW_FILE; | |
237fead6 MH |
167 | return rc; |
168 | } | |
169 | ||
170 | /** | |
171 | * ecryptfs_initialize_file | |
172 | * | |
173 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
174 | * file with a header and first data page. | |
175 | * | |
176 | * Returns zero on success | |
177 | */ | |
178 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) | |
179 | { | |
d7cdc5fe MH |
180 | struct ecryptfs_crypt_stat *crypt_stat = |
181 | &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; | |
237fead6 | 182 | int rc = 0; |
237fead6 | 183 | |
237fead6 MH |
184 | if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { |
185 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); | |
e2bd99ec | 186 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 187 | goto out; |
237fead6 | 188 | } |
e2bd99ec | 189 | crypt_stat->flags |= ECRYPTFS_NEW_FILE; |
237fead6 MH |
190 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
191 | rc = ecryptfs_new_file_context(ecryptfs_dentry); | |
192 | if (rc) { | |
d7cdc5fe MH |
193 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
194 | "context; rc = [%d]\n", rc); | |
195 | goto out; | |
237fead6 | 196 | } |
d7cdc5fe | 197 | rc = ecryptfs_write_metadata(ecryptfs_dentry); |
237fead6 | 198 | if (rc) { |
d7cdc5fe MH |
199 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
200 | goto out; | |
237fead6 | 201 | } |
d7cdc5fe | 202 | rc = grow_file(ecryptfs_dentry); |
5dda6992 | 203 | if (rc) |
d7cdc5fe | 204 | printk(KERN_ERR "Error growing file; rc = [%d]\n", rc); |
237fead6 MH |
205 | out: |
206 | return rc; | |
207 | } | |
208 | ||
209 | /** | |
210 | * ecryptfs_create | |
211 | * @dir: The inode of the directory in which to create the file. | |
212 | * @dentry: The eCryptfs dentry | |
213 | * @mode: The mode of the new file. | |
214 | * @nd: nameidata | |
215 | * | |
216 | * Creates a new file. | |
217 | * | |
218 | * Returns zero on success; non-zero on error condition | |
219 | */ | |
220 | static int | |
221 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
222 | int mode, struct nameidata *nd) | |
223 | { | |
224 | int rc; | |
225 | ||
4981e081 MH |
226 | /* ecryptfs_do_create() calls ecryptfs_interpose(), which opens |
227 | * the crypt_stat->lower_file (persistent file) */ | |
237fead6 MH |
228 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); |
229 | if (unlikely(rc)) { | |
230 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" | |
231 | "lower filesystem\n"); | |
232 | goto out; | |
233 | } | |
234 | /* At this point, a file exists on "disk"; we need to make sure | |
235 | * that this on disk file is prepared to be an ecryptfs file */ | |
236 | rc = ecryptfs_initialize_file(ecryptfs_dentry); | |
237 | out: | |
238 | return rc; | |
239 | } | |
240 | ||
241 | /** | |
242 | * ecryptfs_lookup | |
243 | * @dir: inode | |
244 | * @dentry: The dentry | |
245 | * @nd: nameidata, may be NULL | |
246 | * | |
247 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
248 | * dentry cache and continue on to read it from the disk. | |
249 | */ | |
250 | static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, | |
251 | struct nameidata *nd) | |
252 | { | |
253 | int rc = 0; | |
254 | struct dentry *lower_dir_dentry; | |
255 | struct dentry *lower_dentry; | |
256 | struct vfsmount *lower_mnt; | |
237fead6 | 257 | char *encoded_name; |
c381bfcf | 258 | int encoded_namelen; |
237fead6 | 259 | struct ecryptfs_crypt_stat *crypt_stat = NULL; |
e77a56dd | 260 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
237fead6 MH |
261 | char *page_virt = NULL; |
262 | struct inode *lower_inode; | |
263 | u64 file_size; | |
264 | ||
265 | lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); | |
266 | dentry->d_op = &ecryptfs_dops; | |
267 | if ((dentry->d_name.len == 1 && !strcmp(dentry->d_name.name, ".")) | |
45ec4aba MH |
268 | || (dentry->d_name.len == 2 |
269 | && !strcmp(dentry->d_name.name, ".."))) { | |
270 | d_drop(dentry); | |
271 | goto out; | |
272 | } | |
237fead6 MH |
273 | encoded_namelen = ecryptfs_encode_filename(crypt_stat, |
274 | dentry->d_name.name, | |
275 | dentry->d_name.len, | |
276 | &encoded_name); | |
277 | if (encoded_namelen < 0) { | |
278 | rc = encoded_namelen; | |
45ec4aba MH |
279 | d_drop(dentry); |
280 | goto out; | |
237fead6 MH |
281 | } |
282 | ecryptfs_printk(KERN_DEBUG, "encoded_name = [%s]; encoded_namelen " | |
283 | "= [%d]\n", encoded_name, encoded_namelen); | |
284 | lower_dentry = lookup_one_len(encoded_name, lower_dir_dentry, | |
285 | encoded_namelen - 1); | |
286 | kfree(encoded_name); | |
237fead6 MH |
287 | if (IS_ERR(lower_dentry)) { |
288 | ecryptfs_printk(KERN_ERR, "ERR from lower_dentry\n"); | |
289 | rc = PTR_ERR(lower_dentry); | |
45ec4aba MH |
290 | d_drop(dentry); |
291 | goto out; | |
237fead6 | 292 | } |
45ec4aba | 293 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); |
237fead6 MH |
294 | ecryptfs_printk(KERN_DEBUG, "lower_dentry = [%p]; lower_dentry->" |
295 | "d_name.name = [%s]\n", lower_dentry, | |
296 | lower_dentry->d_name.name); | |
297 | lower_inode = lower_dentry->d_inode; | |
0cc72dc7 | 298 | fsstack_copy_attr_atime(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
299 | BUG_ON(!atomic_read(&lower_dentry->d_count)); |
300 | ecryptfs_set_dentry_private(dentry, | |
301 | kmem_cache_alloc(ecryptfs_dentry_info_cache, | |
e94b1766 | 302 | GFP_KERNEL)); |
237fead6 MH |
303 | if (!ecryptfs_dentry_to_private(dentry)) { |
304 | rc = -ENOMEM; | |
305 | ecryptfs_printk(KERN_ERR, "Out of memory whilst attempting " | |
306 | "to allocate ecryptfs_dentry_info struct\n"); | |
307 | goto out_dput; | |
308 | } | |
309 | ecryptfs_set_dentry_lower(dentry, lower_dentry); | |
310 | ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); | |
311 | if (!lower_dentry->d_inode) { | |
312 | /* We want to add because we couldn't find in lower */ | |
313 | d_add(dentry, NULL); | |
314 | goto out; | |
315 | } | |
316 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 1); | |
317 | if (rc) { | |
318 | ecryptfs_printk(KERN_ERR, "Error interposing\n"); | |
319 | goto out_dput; | |
320 | } | |
321 | if (S_ISDIR(lower_inode->i_mode)) { | |
322 | ecryptfs_printk(KERN_DEBUG, "Is a directory; returning\n"); | |
323 | goto out; | |
324 | } | |
325 | if (S_ISLNK(lower_inode->i_mode)) { | |
326 | ecryptfs_printk(KERN_DEBUG, "Is a symlink; returning\n"); | |
327 | goto out; | |
328 | } | |
202a21d6 RK |
329 | if (special_file(lower_inode->i_mode)) { |
330 | ecryptfs_printk(KERN_DEBUG, "Is a special file; returning\n"); | |
331 | goto out; | |
332 | } | |
237fead6 MH |
333 | if (!nd) { |
334 | ecryptfs_printk(KERN_DEBUG, "We have a NULL nd, just leave" | |
335 | "as we *think* we are about to unlink\n"); | |
336 | goto out; | |
337 | } | |
237fead6 | 338 | /* Released in this function */ |
c3762229 | 339 | page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, |
dd2a3b7a | 340 | GFP_USER); |
237fead6 MH |
341 | if (!page_virt) { |
342 | rc = -ENOMEM; | |
343 | ecryptfs_printk(KERN_ERR, | |
344 | "Cannot ecryptfs_kmalloc a page\n"); | |
345 | goto out_dput; | |
346 | } | |
237fead6 | 347 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
e2bd99ec | 348 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) |
237fead6 | 349 | ecryptfs_set_default_sizes(crypt_stat); |
d7cdc5fe MH |
350 | rc = ecryptfs_read_and_validate_header_region(page_virt, |
351 | dentry->d_inode); | |
237fead6 | 352 | if (rc) { |
dd2a3b7a MH |
353 | rc = ecryptfs_read_and_validate_xattr_region(page_virt, dentry); |
354 | if (rc) { | |
355 | printk(KERN_DEBUG "Valid metadata not found in header " | |
356 | "region or xattr region; treating file as " | |
357 | "unencrypted\n"); | |
358 | rc = 0; | |
237fead6 MH |
359 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
360 | goto out; | |
361 | } | |
dd2a3b7a | 362 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
237fead6 | 363 | } |
e77a56dd MH |
364 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
365 | dentry->d_sb)->mount_crypt_stat; | |
366 | if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { | |
367 | if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) | |
45eaab79 MH |
368 | file_size = ((crypt_stat->extent_size |
369 | * crypt_stat->num_header_extents_at_front) | |
e77a56dd MH |
370 | + i_size_read(lower_dentry->d_inode)); |
371 | else | |
372 | file_size = i_size_read(lower_dentry->d_inode); | |
373 | } else { | |
374 | memcpy(&file_size, page_virt, sizeof(file_size)); | |
375 | file_size = be64_to_cpu(file_size); | |
376 | } | |
dd2a3b7a | 377 | i_size_write(dentry->d_inode, (loff_t)file_size); |
237fead6 MH |
378 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
379 | goto out; | |
380 | ||
381 | out_dput: | |
382 | dput(lower_dentry); | |
237fead6 MH |
383 | d_drop(dentry); |
384 | out: | |
385 | return ERR_PTR(rc); | |
386 | } | |
387 | ||
388 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
389 | struct dentry *new_dentry) | |
390 | { | |
391 | struct dentry *lower_old_dentry; | |
392 | struct dentry *lower_new_dentry; | |
393 | struct dentry *lower_dir_dentry; | |
394 | u64 file_size_save; | |
395 | int rc; | |
396 | ||
397 | file_size_save = i_size_read(old_dentry->d_inode); | |
398 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
399 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
400 | dget(lower_old_dentry); | |
401 | dget(lower_new_dentry); | |
402 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
403 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
404 | lower_new_dentry); | |
405 | if (rc || !lower_new_dentry->d_inode) | |
406 | goto out_lock; | |
407 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); | |
408 | if (rc) | |
409 | goto out_lock; | |
0cc72dc7 JJS |
410 | fsstack_copy_attr_times(dir, lower_new_dentry->d_inode); |
411 | fsstack_copy_inode_size(dir, lower_new_dentry->d_inode); | |
237fead6 MH |
412 | old_dentry->d_inode->i_nlink = |
413 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; | |
414 | i_size_write(new_dentry->d_inode, file_size_save); | |
415 | out_lock: | |
416 | unlock_dir(lower_dir_dentry); | |
417 | dput(lower_new_dentry); | |
418 | dput(lower_old_dentry); | |
ae56fb16 | 419 | d_drop(lower_old_dentry); |
45ec4aba MH |
420 | d_drop(new_dentry); |
421 | d_drop(old_dentry); | |
237fead6 MH |
422 | return rc; |
423 | } | |
424 | ||
425 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
426 | { | |
427 | int rc = 0; | |
428 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
429 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
430 | ||
431 | lock_parent(lower_dentry); | |
432 | rc = vfs_unlink(lower_dir_inode, lower_dentry); | |
433 | if (rc) { | |
ae56fb16 | 434 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
435 | goto out_unlock; |
436 | } | |
0cc72dc7 | 437 | fsstack_copy_attr_times(dir, lower_dir_inode); |
237fead6 MH |
438 | dentry->d_inode->i_nlink = |
439 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; | |
440 | dentry->d_inode->i_ctime = dir->i_ctime; | |
caeeeecf | 441 | d_drop(dentry); |
237fead6 MH |
442 | out_unlock: |
443 | unlock_parent(lower_dentry); | |
444 | return rc; | |
445 | } | |
446 | ||
447 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
448 | const char *symname) | |
449 | { | |
450 | int rc; | |
451 | struct dentry *lower_dentry; | |
452 | struct dentry *lower_dir_dentry; | |
453 | umode_t mode; | |
454 | char *encoded_symname; | |
c381bfcf | 455 | int encoded_symlen; |
237fead6 MH |
456 | struct ecryptfs_crypt_stat *crypt_stat = NULL; |
457 | ||
458 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
459 | dget(lower_dentry); | |
460 | lower_dir_dentry = lock_parent(lower_dentry); | |
461 | mode = S_IALLUGO; | |
462 | encoded_symlen = ecryptfs_encode_filename(crypt_stat, symname, | |
463 | strlen(symname), | |
464 | &encoded_symname); | |
465 | if (encoded_symlen < 0) { | |
466 | rc = encoded_symlen; | |
467 | goto out_lock; | |
468 | } | |
469 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, | |
470 | encoded_symname, mode); | |
471 | kfree(encoded_symname); | |
472 | if (rc || !lower_dentry->d_inode) | |
473 | goto out_lock; | |
474 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
475 | if (rc) | |
476 | goto out_lock; | |
0cc72dc7 JJS |
477 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
478 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
479 | out_lock: |
480 | unlock_dir(lower_dir_dentry); | |
481 | dput(lower_dentry); | |
482 | if (!dentry->d_inode) | |
483 | d_drop(dentry); | |
484 | return rc; | |
485 | } | |
486 | ||
487 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
488 | { | |
489 | int rc; | |
490 | struct dentry *lower_dentry; | |
491 | struct dentry *lower_dir_dentry; | |
492 | ||
493 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
494 | lower_dir_dentry = lock_parent(lower_dentry); | |
495 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
496 | if (rc || !lower_dentry->d_inode) | |
497 | goto out; | |
498 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
499 | if (rc) | |
500 | goto out; | |
0cc72dc7 JJS |
501 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
502 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
503 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
504 | out: | |
505 | unlock_dir(lower_dir_dentry); | |
506 | if (!dentry->d_inode) | |
507 | d_drop(dentry); | |
508 | return rc; | |
509 | } | |
510 | ||
511 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
512 | { | |
237fead6 | 513 | struct dentry *lower_dentry; |
237fead6 | 514 | struct dentry *lower_dir_dentry; |
45ec4aba | 515 | int rc; |
237fead6 MH |
516 | |
517 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 518 | dget(dentry); |
237fead6 | 519 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 520 | dget(lower_dentry); |
237fead6 | 521 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba MH |
522 | dput(lower_dentry); |
523 | if (!rc) | |
524 | d_delete(lower_dentry); | |
0cc72dc7 | 525 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
526 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
527 | unlock_dir(lower_dir_dentry); | |
528 | if (!rc) | |
529 | d_drop(dentry); | |
45ec4aba | 530 | dput(dentry); |
237fead6 MH |
531 | return rc; |
532 | } | |
533 | ||
534 | static int | |
535 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
536 | { | |
537 | int rc; | |
538 | struct dentry *lower_dentry; | |
539 | struct dentry *lower_dir_dentry; | |
540 | ||
541 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
542 | lower_dir_dentry = lock_parent(lower_dentry); | |
543 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
544 | if (rc || !lower_dentry->d_inode) | |
545 | goto out; | |
546 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
547 | if (rc) | |
548 | goto out; | |
0cc72dc7 JJS |
549 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
550 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
551 | out: |
552 | unlock_dir(lower_dir_dentry); | |
553 | if (!dentry->d_inode) | |
554 | d_drop(dentry); | |
555 | return rc; | |
556 | } | |
557 | ||
558 | static int | |
559 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
560 | struct inode *new_dir, struct dentry *new_dentry) | |
561 | { | |
562 | int rc; | |
563 | struct dentry *lower_old_dentry; | |
564 | struct dentry *lower_new_dentry; | |
565 | struct dentry *lower_old_dir_dentry; | |
566 | struct dentry *lower_new_dir_dentry; | |
567 | ||
568 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
569 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
570 | dget(lower_old_dentry); | |
571 | dget(lower_new_dentry); | |
572 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
573 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
574 | lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
575 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, | |
576 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
577 | if (rc) | |
578 | goto out_lock; | |
0cc72dc7 | 579 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode, NULL); |
237fead6 | 580 | if (new_dir != old_dir) |
0cc72dc7 | 581 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode, NULL); |
237fead6 MH |
582 | out_lock: |
583 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
a9083081 MH |
584 | dput(lower_new_dentry->d_parent); |
585 | dput(lower_old_dentry->d_parent); | |
237fead6 MH |
586 | dput(lower_new_dentry); |
587 | dput(lower_old_dentry); | |
588 | return rc; | |
589 | } | |
590 | ||
591 | static int | |
592 | ecryptfs_readlink(struct dentry *dentry, char __user * buf, int bufsiz) | |
593 | { | |
594 | int rc; | |
595 | struct dentry *lower_dentry; | |
596 | char *decoded_name; | |
597 | char *lower_buf; | |
598 | mm_segment_t old_fs; | |
599 | struct ecryptfs_crypt_stat *crypt_stat; | |
600 | ||
601 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
602 | if (!lower_dentry->d_inode->i_op || | |
603 | !lower_dentry->d_inode->i_op->readlink) { | |
604 | rc = -EINVAL; | |
605 | goto out; | |
606 | } | |
607 | /* Released in this function */ | |
608 | lower_buf = kmalloc(bufsiz, GFP_KERNEL); | |
609 | if (lower_buf == NULL) { | |
610 | ecryptfs_printk(KERN_ERR, "Out of memory\n"); | |
611 | rc = -ENOMEM; | |
612 | goto out; | |
613 | } | |
614 | old_fs = get_fs(); | |
615 | set_fs(get_ds()); | |
616 | ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " | |
617 | "lower_dentry->d_name.name = [%s]\n", | |
618 | lower_dentry->d_name.name); | |
619 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, | |
620 | (char __user *)lower_buf, | |
621 | bufsiz); | |
622 | set_fs(old_fs); | |
623 | if (rc >= 0) { | |
624 | crypt_stat = NULL; | |
625 | rc = ecryptfs_decode_filename(crypt_stat, lower_buf, rc, | |
626 | &decoded_name); | |
627 | if (rc == -ENOMEM) | |
628 | goto out_free_lower_buf; | |
629 | if (rc > 0) { | |
630 | ecryptfs_printk(KERN_DEBUG, "Copying [%d] bytes " | |
631 | "to userspace: [%*s]\n", rc, | |
632 | decoded_name); | |
633 | if (copy_to_user(buf, decoded_name, rc)) | |
634 | rc = -EFAULT; | |
635 | } | |
636 | kfree(decoded_name); | |
0cc72dc7 JJS |
637 | fsstack_copy_attr_atime(dentry->d_inode, |
638 | lower_dentry->d_inode); | |
237fead6 MH |
639 | } |
640 | out_free_lower_buf: | |
641 | kfree(lower_buf); | |
642 | out: | |
643 | return rc; | |
644 | } | |
645 | ||
646 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
647 | { | |
648 | char *buf; | |
649 | int len = PAGE_SIZE, rc; | |
650 | mm_segment_t old_fs; | |
651 | ||
652 | /* Released in ecryptfs_put_link(); only release here on error */ | |
653 | buf = kmalloc(len, GFP_KERNEL); | |
654 | if (!buf) { | |
655 | rc = -ENOMEM; | |
656 | goto out; | |
657 | } | |
658 | old_fs = get_fs(); | |
659 | set_fs(get_ds()); | |
660 | ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " | |
661 | "dentry->d_name.name = [%s]\n", dentry->d_name.name); | |
662 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); | |
663 | buf[rc] = '\0'; | |
664 | set_fs(old_fs); | |
665 | if (rc < 0) | |
666 | goto out_free; | |
667 | rc = 0; | |
668 | nd_set_link(nd, buf); | |
669 | goto out; | |
670 | out_free: | |
671 | kfree(buf); | |
672 | out: | |
673 | return ERR_PTR(rc); | |
674 | } | |
675 | ||
676 | static void | |
677 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
678 | { | |
679 | /* Free the char* */ | |
680 | kfree(nd_get_link(nd)); | |
681 | } | |
682 | ||
683 | /** | |
684 | * upper_size_to_lower_size | |
685 | * @crypt_stat: Crypt_stat associated with file | |
686 | * @upper_size: Size of the upper file | |
687 | * | |
688 | * Calculate the requried size of the lower file based on the | |
689 | * specified size of the upper file. This calculation is based on the | |
690 | * number of headers in the underlying file and the extent size. | |
691 | * | |
692 | * Returns Calculated size of the lower file. | |
693 | */ | |
694 | static loff_t | |
695 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
696 | loff_t upper_size) | |
697 | { | |
698 | loff_t lower_size; | |
699 | ||
45eaab79 MH |
700 | lower_size = (crypt_stat->extent_size |
701 | * crypt_stat->num_header_extents_at_front); | |
237fead6 MH |
702 | if (upper_size != 0) { |
703 | loff_t num_extents; | |
704 | ||
705 | num_extents = upper_size >> crypt_stat->extent_shift; | |
706 | if (upper_size & ~crypt_stat->extent_mask) | |
707 | num_extents++; | |
708 | lower_size += (num_extents * crypt_stat->extent_size); | |
709 | } | |
710 | return lower_size; | |
711 | } | |
712 | ||
713 | /** | |
714 | * ecryptfs_truncate | |
715 | * @dentry: The ecryptfs layer dentry | |
716 | * @new_length: The length to expand the file to | |
717 | * | |
718 | * Function to handle truncations modifying the size of the file. Note | |
719 | * that the file sizes are interpolated. When expanding, we are simply | |
720 | * writing strings of 0's out. When truncating, we need to modify the | |
721 | * underlying file size according to the page index interpolations. | |
722 | * | |
723 | * Returns zero on success; non-zero otherwise | |
724 | */ | |
725 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
726 | { | |
727 | int rc = 0; | |
728 | struct inode *inode = dentry->d_inode; | |
729 | struct dentry *lower_dentry; | |
2ed92554 | 730 | struct file fake_ecryptfs_file; |
237fead6 MH |
731 | struct ecryptfs_crypt_stat *crypt_stat; |
732 | loff_t i_size = i_size_read(inode); | |
733 | loff_t lower_size_before_truncate; | |
734 | loff_t lower_size_after_truncate; | |
735 | ||
736 | if (unlikely((new_length == i_size))) | |
737 | goto out; | |
738 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
739 | /* Set up a fake ecryptfs file, this is used to interface with | |
740 | * the file in the underlying filesystem so that the | |
741 | * truncation has an effect there as well. */ | |
742 | memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file)); | |
bd243a4b | 743 | fake_ecryptfs_file.f_path.dentry = dentry; |
237fead6 MH |
744 | /* Released at out_free: label */ |
745 | ecryptfs_set_file_private(&fake_ecryptfs_file, | |
746 | kmem_cache_alloc(ecryptfs_file_info_cache, | |
e94b1766 | 747 | GFP_KERNEL)); |
237fead6 MH |
748 | if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) { |
749 | rc = -ENOMEM; | |
750 | goto out; | |
751 | } | |
752 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2ed92554 MH |
753 | ecryptfs_set_file_lower( |
754 | &fake_ecryptfs_file, | |
755 | ecryptfs_inode_to_private(dentry->d_inode)->lower_file); | |
237fead6 MH |
756 | /* Switch on growing or shrinking file */ |
757 | if (new_length > i_size) { | |
2ed92554 MH |
758 | char zero[] = { 0x00 }; |
759 | ||
760 | /* Write a single 0 at the last position of the file; | |
761 | * this triggers code that will fill in 0's throughout | |
762 | * the intermediate portion of the previous end of the | |
763 | * file and the new and of the file */ | |
764 | rc = ecryptfs_write(&fake_ecryptfs_file, zero, | |
765 | (new_length - 1), 1); | |
237fead6 | 766 | } else { /* new_length < i_size_read(inode) */ |
2ed92554 MH |
767 | /* We're chopping off all the pages down do the page |
768 | * in which new_length is located. Fill in the end of | |
769 | * that page from (new_length & ~PAGE_CACHE_MASK) to | |
770 | * PAGE_CACHE_SIZE with zeros. */ | |
771 | size_t num_zeros = (PAGE_CACHE_SIZE | |
772 | - (new_length & ~PAGE_CACHE_MASK)); | |
773 | ||
774 | if (num_zeros) { | |
775 | char *zeros_virt; | |
776 | ||
777 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
778 | if (!zeros_virt) { | |
779 | rc = -ENOMEM; | |
780 | goto out_free; | |
781 | } | |
782 | rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt, | |
783 | new_length, num_zeros); | |
784 | kfree(zeros_virt); | |
5dda6992 | 785 | if (rc) { |
240e2df5 MH |
786 | printk(KERN_ERR "Error attempting to zero out " |
787 | "the remainder of the end page on " | |
788 | "reducing truncate; rc = [%d]\n", rc); | |
2ed92554 | 789 | goto out_free; |
240e2df5 MH |
790 | } |
791 | } | |
237fead6 | 792 | vmtruncate(inode, new_length); |
0216f7f7 | 793 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
794 | if (rc) { |
795 | printk(KERN_ERR "Problem with " | |
796 | "ecryptfs_write_inode_size_to_metadata; " | |
797 | "rc = [%d]\n", rc); | |
2ed92554 | 798 | goto out_free; |
dd2a3b7a | 799 | } |
237fead6 MH |
800 | /* We are reducing the size of the ecryptfs file, and need to |
801 | * know if we need to reduce the size of the lower file. */ | |
802 | lower_size_before_truncate = | |
803 | upper_size_to_lower_size(crypt_stat, i_size); | |
804 | lower_size_after_truncate = | |
805 | upper_size_to_lower_size(crypt_stat, new_length); | |
806 | if (lower_size_after_truncate < lower_size_before_truncate) | |
807 | vmtruncate(lower_dentry->d_inode, | |
808 | lower_size_after_truncate); | |
809 | } | |
237fead6 MH |
810 | out_free: |
811 | if (ecryptfs_file_to_private(&fake_ecryptfs_file)) | |
812 | kmem_cache_free(ecryptfs_file_info_cache, | |
813 | ecryptfs_file_to_private(&fake_ecryptfs_file)); | |
814 | out: | |
815 | return rc; | |
816 | } | |
817 | ||
818 | static int | |
819 | ecryptfs_permission(struct inode *inode, int mask, struct nameidata *nd) | |
820 | { | |
821 | int rc; | |
822 | ||
823 | if (nd) { | |
824 | struct vfsmount *vfsmnt_save = nd->mnt; | |
825 | struct dentry *dentry_save = nd->dentry; | |
826 | ||
827 | nd->mnt = ecryptfs_dentry_to_lower_mnt(nd->dentry); | |
828 | nd->dentry = ecryptfs_dentry_to_lower(nd->dentry); | |
829 | rc = permission(ecryptfs_inode_to_lower(inode), mask, nd); | |
830 | nd->mnt = vfsmnt_save; | |
831 | nd->dentry = dentry_save; | |
832 | } else | |
833 | rc = permission(ecryptfs_inode_to_lower(inode), mask, NULL); | |
834 | return rc; | |
835 | } | |
836 | ||
837 | /** | |
838 | * ecryptfs_setattr | |
839 | * @dentry: dentry handle to the inode to modify | |
840 | * @ia: Structure with flags of what to change and values | |
841 | * | |
842 | * Updates the metadata of an inode. If the update is to the size | |
843 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
844 | * of both the ecryptfs inode and the lower inode. | |
845 | * | |
846 | * All other metadata changes will be passed right to the lower filesystem, | |
847 | * and we will just update our inode to look like the lower. | |
848 | */ | |
849 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
850 | { | |
851 | int rc = 0; | |
852 | struct dentry *lower_dentry; | |
853 | struct inode *inode; | |
854 | struct inode *lower_inode; | |
855 | struct ecryptfs_crypt_stat *crypt_stat; | |
856 | ||
857 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
858 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
859 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
860 | inode = dentry->d_inode; |
861 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
862 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
863 | mutex_lock(&crypt_stat->cs_mutex); | |
864 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
865 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
866 | else if (S_ISREG(dentry->d_inode->i_mode) |
867 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
868 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 869 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 870 | |
e10f281b MH |
871 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
872 | dentry->d_sb)->mount_crypt_stat; | |
d7cdc5fe | 873 | rc = ecryptfs_read_metadata(dentry); |
5dda6992 | 874 | if (rc) { |
e10f281b MH |
875 | if (!(mount_crypt_stat->flags |
876 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
877 | rc = -EIO; | |
878 | printk(KERN_WARNING "Attempt to read file that " | |
879 | "is not in a valid eCryptfs format, " | |
880 | "and plaintext passthrough mode is not " | |
881 | "enabled; returning -EIO\n"); | |
882 | ||
883 | mutex_unlock(&crypt_stat->cs_mutex); | |
e10f281b MH |
884 | goto out; |
885 | } | |
886 | rc = 0; | |
887 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
888 | mutex_unlock(&crypt_stat->cs_mutex); | |
e10f281b MH |
889 | goto out; |
890 | } | |
e10f281b MH |
891 | } |
892 | mutex_unlock(&crypt_stat->cs_mutex); | |
237fead6 MH |
893 | if (ia->ia_valid & ATTR_SIZE) { |
894 | ecryptfs_printk(KERN_DEBUG, | |
895 | "ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n", | |
896 | ia->ia_valid, ATTR_SIZE); | |
897 | rc = ecryptfs_truncate(dentry, ia->ia_size); | |
898 | /* ecryptfs_truncate handles resizing of the lower file */ | |
899 | ia->ia_valid &= ~ATTR_SIZE; | |
900 | ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [%x]\n", | |
901 | ia->ia_valid); | |
902 | if (rc < 0) | |
903 | goto out; | |
904 | } | |
1ac564ec JL |
905 | |
906 | /* | |
907 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
908 | * to interpret this in its own way. | |
909 | */ | |
910 | if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) | |
911 | ia->ia_valid &= ~ATTR_MODE; | |
912 | ||
237fead6 MH |
913 | rc = notify_change(lower_dentry, ia); |
914 | out: | |
0cc72dc7 | 915 | fsstack_copy_attr_all(inode, lower_inode, NULL); |
237fead6 MH |
916 | return rc; |
917 | } | |
918 | ||
dd2a3b7a | 919 | int |
237fead6 MH |
920 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
921 | size_t size, int flags) | |
922 | { | |
923 | int rc = 0; | |
924 | struct dentry *lower_dentry; | |
925 | ||
926 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
927 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
928 | rc = -ENOSYS; | |
929 | goto out; | |
930 | } | |
931 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
932 | rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, | |
933 | size, flags); | |
934 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
935 | out: | |
936 | return rc; | |
937 | } | |
938 | ||
d7cdc5fe MH |
939 | ssize_t |
940 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
941 | void *value, size_t size) | |
942 | { | |
943 | int rc = 0; | |
944 | ||
945 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
946 | rc = -ENOSYS; | |
947 | goto out; | |
948 | } | |
949 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
950 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
951 | size); | |
952 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
953 | out: | |
954 | return rc; | |
955 | } | |
956 | ||
dd2a3b7a | 957 | ssize_t |
237fead6 MH |
958 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
959 | size_t size) | |
960 | { | |
2ed92554 MH |
961 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
962 | value, size); | |
237fead6 MH |
963 | } |
964 | ||
965 | static ssize_t | |
966 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
967 | { | |
968 | int rc = 0; | |
969 | struct dentry *lower_dentry; | |
970 | ||
971 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
972 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
973 | rc = -ENOSYS; | |
974 | goto out; | |
975 | } | |
976 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
977 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
978 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
979 | out: | |
980 | return rc; | |
981 | } | |
982 | ||
983 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
984 | { | |
985 | int rc = 0; | |
986 | struct dentry *lower_dentry; | |
987 | ||
988 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
989 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
990 | rc = -ENOSYS; | |
991 | goto out; | |
992 | } | |
993 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
994 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
995 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
996 | out: | |
997 | return rc; | |
998 | } | |
999 | ||
1000 | int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) | |
1001 | { | |
1002 | if ((ecryptfs_inode_to_lower(inode) | |
1003 | == (struct inode *)candidate_lower_inode)) | |
1004 | return 1; | |
1005 | else | |
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | int ecryptfs_inode_set(struct inode *inode, void *lower_inode) | |
1010 | { | |
1011 | ecryptfs_init_inode(inode, (struct inode *)lower_inode); | |
1012 | return 0; | |
1013 | } | |
1014 | ||
754661f1 | 1015 | const struct inode_operations ecryptfs_symlink_iops = { |
237fead6 MH |
1016 | .readlink = ecryptfs_readlink, |
1017 | .follow_link = ecryptfs_follow_link, | |
1018 | .put_link = ecryptfs_put_link, | |
1019 | .permission = ecryptfs_permission, | |
1020 | .setattr = ecryptfs_setattr, | |
1021 | .setxattr = ecryptfs_setxattr, | |
1022 | .getxattr = ecryptfs_getxattr, | |
1023 | .listxattr = ecryptfs_listxattr, | |
1024 | .removexattr = ecryptfs_removexattr | |
1025 | }; | |
1026 | ||
754661f1 | 1027 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1028 | .create = ecryptfs_create, |
1029 | .lookup = ecryptfs_lookup, | |
1030 | .link = ecryptfs_link, | |
1031 | .unlink = ecryptfs_unlink, | |
1032 | .symlink = ecryptfs_symlink, | |
1033 | .mkdir = ecryptfs_mkdir, | |
1034 | .rmdir = ecryptfs_rmdir, | |
1035 | .mknod = ecryptfs_mknod, | |
1036 | .rename = ecryptfs_rename, | |
1037 | .permission = ecryptfs_permission, | |
1038 | .setattr = ecryptfs_setattr, | |
1039 | .setxattr = ecryptfs_setxattr, | |
1040 | .getxattr = ecryptfs_getxattr, | |
1041 | .listxattr = ecryptfs_listxattr, | |
1042 | .removexattr = ecryptfs_removexattr | |
1043 | }; | |
1044 | ||
754661f1 | 1045 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
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 | }; |