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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 MH |
122 | if (rc) { |
123 | struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode; | |
124 | struct ecryptfs_inode_info *inode_info = | |
125 | ecryptfs_inode_to_private(ecryptfs_inode); | |
126 | ||
127 | printk(KERN_WARNING "%s: Error creating underlying file; " | |
128 | "rc = [%d]; checking for existing\n", __FUNCTION__, rc); | |
129 | if (inode_info) { | |
130 | mutex_lock(&inode_info->lower_file_mutex); | |
131 | if (!inode_info->lower_file) { | |
132 | mutex_unlock(&inode_info->lower_file_mutex); | |
133 | printk(KERN_ERR "%s: Failure to set underlying " | |
134 | "file; rc = [%d]\n", __FUNCTION__, rc); | |
135 | goto out_lock; | |
136 | } | |
137 | mutex_unlock(&inode_info->lower_file_mutex); | |
138 | } | |
237fead6 MH |
139 | } |
140 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, | |
141 | directory_inode->i_sb, 0); | |
142 | if (rc) { | |
143 | ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); | |
144 | goto out_lock; | |
145 | } | |
0cc72dc7 JJS |
146 | fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); |
147 | fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); | |
237fead6 MH |
148 | out_lock: |
149 | unlock_dir(lower_dir_dentry); | |
150 | out: | |
151 | return rc; | |
152 | } | |
153 | ||
154 | /** | |
155 | * grow_file | |
d7cdc5fe | 156 | * @ecryptfs_dentry: the eCryptfs dentry |
237fead6 MH |
157 | * |
158 | * This is the code which will grow the file to its correct size. | |
159 | */ | |
d7cdc5fe | 160 | static int grow_file(struct dentry *ecryptfs_dentry) |
237fead6 | 161 | { |
d7cdc5fe | 162 | struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode; |
237fead6 MH |
163 | struct file fake_file; |
164 | struct ecryptfs_file_info tmp_file_info; | |
d7cdc5fe MH |
165 | char zero_virt[] = { 0x00 }; |
166 | int rc = 0; | |
237fead6 MH |
167 | |
168 | memset(&fake_file, 0, sizeof(fake_file)); | |
bd243a4b | 169 | fake_file.f_path.dentry = ecryptfs_dentry; |
237fead6 MH |
170 | memset(&tmp_file_info, 0, sizeof(tmp_file_info)); |
171 | ecryptfs_set_file_private(&fake_file, &tmp_file_info); | |
d7cdc5fe MH |
172 | ecryptfs_set_file_lower( |
173 | &fake_file, | |
174 | ecryptfs_inode_to_private(ecryptfs_inode)->lower_file); | |
175 | rc = ecryptfs_write(&fake_file, zero_virt, 0, 1); | |
176 | i_size_write(ecryptfs_inode, 0); | |
177 | rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode); | |
178 | ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |= | |
179 | ECRYPTFS_NEW_FILE; | |
237fead6 MH |
180 | return rc; |
181 | } | |
182 | ||
183 | /** | |
184 | * ecryptfs_initialize_file | |
185 | * | |
186 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
187 | * file with a header and first data page. | |
188 | * | |
189 | * Returns zero on success | |
190 | */ | |
191 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) | |
192 | { | |
d7cdc5fe MH |
193 | struct ecryptfs_crypt_stat *crypt_stat = |
194 | &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; | |
237fead6 | 195 | int rc = 0; |
237fead6 | 196 | |
237fead6 MH |
197 | if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { |
198 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); | |
e2bd99ec | 199 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 200 | goto out; |
237fead6 | 201 | } |
e2bd99ec | 202 | crypt_stat->flags |= ECRYPTFS_NEW_FILE; |
237fead6 MH |
203 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
204 | rc = ecryptfs_new_file_context(ecryptfs_dentry); | |
205 | if (rc) { | |
d7cdc5fe MH |
206 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
207 | "context; rc = [%d]\n", rc); | |
208 | goto out; | |
237fead6 | 209 | } |
d7cdc5fe | 210 | rc = ecryptfs_write_metadata(ecryptfs_dentry); |
237fead6 | 211 | if (rc) { |
d7cdc5fe MH |
212 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
213 | goto out; | |
237fead6 | 214 | } |
d7cdc5fe | 215 | rc = grow_file(ecryptfs_dentry); |
5dda6992 | 216 | if (rc) |
d7cdc5fe | 217 | printk(KERN_ERR "Error growing file; rc = [%d]\n", rc); |
237fead6 MH |
218 | out: |
219 | return rc; | |
220 | } | |
221 | ||
222 | /** | |
223 | * ecryptfs_create | |
224 | * @dir: The inode of the directory in which to create the file. | |
225 | * @dentry: The eCryptfs dentry | |
226 | * @mode: The mode of the new file. | |
227 | * @nd: nameidata | |
228 | * | |
229 | * Creates a new file. | |
230 | * | |
231 | * Returns zero on success; non-zero on error condition | |
232 | */ | |
233 | static int | |
234 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
235 | int mode, struct nameidata *nd) | |
236 | { | |
237 | int rc; | |
238 | ||
4981e081 MH |
239 | /* ecryptfs_do_create() calls ecryptfs_interpose(), which opens |
240 | * the crypt_stat->lower_file (persistent file) */ | |
237fead6 MH |
241 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); |
242 | if (unlikely(rc)) { | |
243 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" | |
244 | "lower filesystem\n"); | |
245 | goto out; | |
246 | } | |
247 | /* At this point, a file exists on "disk"; we need to make sure | |
248 | * that this on disk file is prepared to be an ecryptfs file */ | |
249 | rc = ecryptfs_initialize_file(ecryptfs_dentry); | |
250 | out: | |
251 | return rc; | |
252 | } | |
253 | ||
254 | /** | |
255 | * ecryptfs_lookup | |
256 | * @dir: inode | |
257 | * @dentry: The dentry | |
258 | * @nd: nameidata, may be NULL | |
259 | * | |
260 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
261 | * dentry cache and continue on to read it from the disk. | |
262 | */ | |
263 | static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, | |
264 | struct nameidata *nd) | |
265 | { | |
266 | int rc = 0; | |
267 | struct dentry *lower_dir_dentry; | |
268 | struct dentry *lower_dentry; | |
269 | struct vfsmount *lower_mnt; | |
237fead6 | 270 | char *encoded_name; |
c381bfcf | 271 | int encoded_namelen; |
237fead6 | 272 | struct ecryptfs_crypt_stat *crypt_stat = NULL; |
e77a56dd | 273 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
237fead6 MH |
274 | char *page_virt = NULL; |
275 | struct inode *lower_inode; | |
276 | u64 file_size; | |
277 | ||
278 | lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); | |
279 | dentry->d_op = &ecryptfs_dops; | |
280 | if ((dentry->d_name.len == 1 && !strcmp(dentry->d_name.name, ".")) | |
45ec4aba MH |
281 | || (dentry->d_name.len == 2 |
282 | && !strcmp(dentry->d_name.name, ".."))) { | |
283 | d_drop(dentry); | |
284 | goto out; | |
285 | } | |
237fead6 MH |
286 | encoded_namelen = ecryptfs_encode_filename(crypt_stat, |
287 | dentry->d_name.name, | |
288 | dentry->d_name.len, | |
289 | &encoded_name); | |
290 | if (encoded_namelen < 0) { | |
291 | rc = encoded_namelen; | |
45ec4aba MH |
292 | d_drop(dentry); |
293 | goto out; | |
237fead6 MH |
294 | } |
295 | ecryptfs_printk(KERN_DEBUG, "encoded_name = [%s]; encoded_namelen " | |
296 | "= [%d]\n", encoded_name, encoded_namelen); | |
297 | lower_dentry = lookup_one_len(encoded_name, lower_dir_dentry, | |
298 | encoded_namelen - 1); | |
299 | kfree(encoded_name); | |
237fead6 MH |
300 | if (IS_ERR(lower_dentry)) { |
301 | ecryptfs_printk(KERN_ERR, "ERR from lower_dentry\n"); | |
302 | rc = PTR_ERR(lower_dentry); | |
45ec4aba MH |
303 | d_drop(dentry); |
304 | goto out; | |
237fead6 | 305 | } |
45ec4aba | 306 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); |
237fead6 MH |
307 | ecryptfs_printk(KERN_DEBUG, "lower_dentry = [%p]; lower_dentry->" |
308 | "d_name.name = [%s]\n", lower_dentry, | |
309 | lower_dentry->d_name.name); | |
310 | lower_inode = lower_dentry->d_inode; | |
0cc72dc7 | 311 | fsstack_copy_attr_atime(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
312 | BUG_ON(!atomic_read(&lower_dentry->d_count)); |
313 | ecryptfs_set_dentry_private(dentry, | |
314 | kmem_cache_alloc(ecryptfs_dentry_info_cache, | |
e94b1766 | 315 | GFP_KERNEL)); |
237fead6 MH |
316 | if (!ecryptfs_dentry_to_private(dentry)) { |
317 | rc = -ENOMEM; | |
318 | ecryptfs_printk(KERN_ERR, "Out of memory whilst attempting " | |
319 | "to allocate ecryptfs_dentry_info struct\n"); | |
320 | goto out_dput; | |
321 | } | |
322 | ecryptfs_set_dentry_lower(dentry, lower_dentry); | |
323 | ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); | |
324 | if (!lower_dentry->d_inode) { | |
325 | /* We want to add because we couldn't find in lower */ | |
326 | d_add(dentry, NULL); | |
327 | goto out; | |
328 | } | |
329 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 1); | |
330 | if (rc) { | |
331 | ecryptfs_printk(KERN_ERR, "Error interposing\n"); | |
332 | goto out_dput; | |
333 | } | |
334 | if (S_ISDIR(lower_inode->i_mode)) { | |
335 | ecryptfs_printk(KERN_DEBUG, "Is a directory; returning\n"); | |
336 | goto out; | |
337 | } | |
338 | if (S_ISLNK(lower_inode->i_mode)) { | |
339 | ecryptfs_printk(KERN_DEBUG, "Is a symlink; returning\n"); | |
340 | goto out; | |
341 | } | |
202a21d6 RK |
342 | if (special_file(lower_inode->i_mode)) { |
343 | ecryptfs_printk(KERN_DEBUG, "Is a special file; returning\n"); | |
344 | goto out; | |
345 | } | |
237fead6 MH |
346 | if (!nd) { |
347 | ecryptfs_printk(KERN_DEBUG, "We have a NULL nd, just leave" | |
348 | "as we *think* we are about to unlink\n"); | |
349 | goto out; | |
350 | } | |
237fead6 | 351 | /* Released in this function */ |
c3762229 | 352 | page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, |
dd2a3b7a | 353 | GFP_USER); |
237fead6 MH |
354 | if (!page_virt) { |
355 | rc = -ENOMEM; | |
356 | ecryptfs_printk(KERN_ERR, | |
357 | "Cannot ecryptfs_kmalloc a page\n"); | |
358 | goto out_dput; | |
359 | } | |
237fead6 | 360 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
e2bd99ec | 361 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) |
237fead6 | 362 | ecryptfs_set_default_sizes(crypt_stat); |
d7cdc5fe MH |
363 | rc = ecryptfs_read_and_validate_header_region(page_virt, |
364 | dentry->d_inode); | |
237fead6 | 365 | if (rc) { |
dd2a3b7a MH |
366 | rc = ecryptfs_read_and_validate_xattr_region(page_virt, dentry); |
367 | if (rc) { | |
368 | printk(KERN_DEBUG "Valid metadata not found in header " | |
369 | "region or xattr region; treating file as " | |
370 | "unencrypted\n"); | |
371 | rc = 0; | |
237fead6 MH |
372 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
373 | goto out; | |
374 | } | |
dd2a3b7a | 375 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
237fead6 | 376 | } |
e77a56dd MH |
377 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
378 | dentry->d_sb)->mount_crypt_stat; | |
379 | if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { | |
380 | if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) | |
45eaab79 MH |
381 | file_size = ((crypt_stat->extent_size |
382 | * crypt_stat->num_header_extents_at_front) | |
e77a56dd MH |
383 | + i_size_read(lower_dentry->d_inode)); |
384 | else | |
385 | file_size = i_size_read(lower_dentry->d_inode); | |
386 | } else { | |
387 | memcpy(&file_size, page_virt, sizeof(file_size)); | |
388 | file_size = be64_to_cpu(file_size); | |
389 | } | |
dd2a3b7a | 390 | i_size_write(dentry->d_inode, (loff_t)file_size); |
237fead6 MH |
391 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
392 | goto out; | |
393 | ||
394 | out_dput: | |
395 | dput(lower_dentry); | |
237fead6 MH |
396 | d_drop(dentry); |
397 | out: | |
398 | return ERR_PTR(rc); | |
399 | } | |
400 | ||
401 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
402 | struct dentry *new_dentry) | |
403 | { | |
404 | struct dentry *lower_old_dentry; | |
405 | struct dentry *lower_new_dentry; | |
406 | struct dentry *lower_dir_dentry; | |
407 | u64 file_size_save; | |
408 | int rc; | |
409 | ||
410 | file_size_save = i_size_read(old_dentry->d_inode); | |
411 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
412 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
413 | dget(lower_old_dentry); | |
414 | dget(lower_new_dentry); | |
415 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
416 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
417 | lower_new_dentry); | |
418 | if (rc || !lower_new_dentry->d_inode) | |
419 | goto out_lock; | |
420 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); | |
421 | if (rc) | |
422 | goto out_lock; | |
0cc72dc7 JJS |
423 | fsstack_copy_attr_times(dir, lower_new_dentry->d_inode); |
424 | fsstack_copy_inode_size(dir, lower_new_dentry->d_inode); | |
237fead6 MH |
425 | old_dentry->d_inode->i_nlink = |
426 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; | |
427 | i_size_write(new_dentry->d_inode, file_size_save); | |
428 | out_lock: | |
429 | unlock_dir(lower_dir_dentry); | |
430 | dput(lower_new_dentry); | |
431 | dput(lower_old_dentry); | |
ae56fb16 | 432 | d_drop(lower_old_dentry); |
45ec4aba MH |
433 | d_drop(new_dentry); |
434 | d_drop(old_dentry); | |
237fead6 MH |
435 | return rc; |
436 | } | |
437 | ||
438 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
439 | { | |
440 | int rc = 0; | |
441 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
442 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
443 | ||
444 | lock_parent(lower_dentry); | |
445 | rc = vfs_unlink(lower_dir_inode, lower_dentry); | |
446 | if (rc) { | |
ae56fb16 | 447 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
448 | goto out_unlock; |
449 | } | |
0cc72dc7 | 450 | fsstack_copy_attr_times(dir, lower_dir_inode); |
237fead6 MH |
451 | dentry->d_inode->i_nlink = |
452 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; | |
453 | dentry->d_inode->i_ctime = dir->i_ctime; | |
454 | out_unlock: | |
455 | unlock_parent(lower_dentry); | |
456 | return rc; | |
457 | } | |
458 | ||
459 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
460 | const char *symname) | |
461 | { | |
462 | int rc; | |
463 | struct dentry *lower_dentry; | |
464 | struct dentry *lower_dir_dentry; | |
465 | umode_t mode; | |
466 | char *encoded_symname; | |
c381bfcf | 467 | int encoded_symlen; |
237fead6 MH |
468 | struct ecryptfs_crypt_stat *crypt_stat = NULL; |
469 | ||
470 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
471 | dget(lower_dentry); | |
472 | lower_dir_dentry = lock_parent(lower_dentry); | |
473 | mode = S_IALLUGO; | |
474 | encoded_symlen = ecryptfs_encode_filename(crypt_stat, symname, | |
475 | strlen(symname), | |
476 | &encoded_symname); | |
477 | if (encoded_symlen < 0) { | |
478 | rc = encoded_symlen; | |
479 | goto out_lock; | |
480 | } | |
481 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, | |
482 | encoded_symname, mode); | |
483 | kfree(encoded_symname); | |
484 | if (rc || !lower_dentry->d_inode) | |
485 | goto out_lock; | |
486 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
487 | if (rc) | |
488 | goto out_lock; | |
0cc72dc7 JJS |
489 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
490 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
491 | out_lock: |
492 | unlock_dir(lower_dir_dentry); | |
493 | dput(lower_dentry); | |
494 | if (!dentry->d_inode) | |
495 | d_drop(dentry); | |
496 | return rc; | |
497 | } | |
498 | ||
499 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
500 | { | |
501 | int rc; | |
502 | struct dentry *lower_dentry; | |
503 | struct dentry *lower_dir_dentry; | |
504 | ||
505 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
506 | lower_dir_dentry = lock_parent(lower_dentry); | |
507 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
508 | if (rc || !lower_dentry->d_inode) | |
509 | goto out; | |
510 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
511 | if (rc) | |
512 | goto out; | |
0cc72dc7 JJS |
513 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
514 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
515 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
516 | out: | |
517 | unlock_dir(lower_dir_dentry); | |
518 | if (!dentry->d_inode) | |
519 | d_drop(dentry); | |
520 | return rc; | |
521 | } | |
522 | ||
523 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
524 | { | |
237fead6 | 525 | struct dentry *lower_dentry; |
237fead6 | 526 | struct dentry *lower_dir_dentry; |
45ec4aba | 527 | int rc; |
237fead6 MH |
528 | |
529 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 530 | dget(dentry); |
237fead6 | 531 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 532 | dget(lower_dentry); |
237fead6 | 533 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba MH |
534 | dput(lower_dentry); |
535 | if (!rc) | |
536 | d_delete(lower_dentry); | |
0cc72dc7 | 537 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
538 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
539 | unlock_dir(lower_dir_dentry); | |
540 | if (!rc) | |
541 | d_drop(dentry); | |
45ec4aba | 542 | dput(dentry); |
237fead6 MH |
543 | return rc; |
544 | } | |
545 | ||
546 | static int | |
547 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
548 | { | |
549 | int rc; | |
550 | struct dentry *lower_dentry; | |
551 | struct dentry *lower_dir_dentry; | |
552 | ||
553 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
554 | lower_dir_dentry = lock_parent(lower_dentry); | |
555 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
556 | if (rc || !lower_dentry->d_inode) | |
557 | goto out; | |
558 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
559 | if (rc) | |
560 | goto out; | |
0cc72dc7 JJS |
561 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
562 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
563 | out: |
564 | unlock_dir(lower_dir_dentry); | |
565 | if (!dentry->d_inode) | |
566 | d_drop(dentry); | |
567 | return rc; | |
568 | } | |
569 | ||
570 | static int | |
571 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
572 | struct inode *new_dir, struct dentry *new_dentry) | |
573 | { | |
574 | int rc; | |
575 | struct dentry *lower_old_dentry; | |
576 | struct dentry *lower_new_dentry; | |
577 | struct dentry *lower_old_dir_dentry; | |
578 | struct dentry *lower_new_dir_dentry; | |
579 | ||
580 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
581 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
582 | dget(lower_old_dentry); | |
583 | dget(lower_new_dentry); | |
584 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
585 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
586 | lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
587 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, | |
588 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
589 | if (rc) | |
590 | goto out_lock; | |
0cc72dc7 | 591 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode, NULL); |
237fead6 | 592 | if (new_dir != old_dir) |
0cc72dc7 | 593 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode, NULL); |
237fead6 MH |
594 | out_lock: |
595 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
a9083081 MH |
596 | dput(lower_new_dentry->d_parent); |
597 | dput(lower_old_dentry->d_parent); | |
237fead6 MH |
598 | dput(lower_new_dentry); |
599 | dput(lower_old_dentry); | |
600 | return rc; | |
601 | } | |
602 | ||
603 | static int | |
604 | ecryptfs_readlink(struct dentry *dentry, char __user * buf, int bufsiz) | |
605 | { | |
606 | int rc; | |
607 | struct dentry *lower_dentry; | |
608 | char *decoded_name; | |
609 | char *lower_buf; | |
610 | mm_segment_t old_fs; | |
611 | struct ecryptfs_crypt_stat *crypt_stat; | |
612 | ||
613 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
614 | if (!lower_dentry->d_inode->i_op || | |
615 | !lower_dentry->d_inode->i_op->readlink) { | |
616 | rc = -EINVAL; | |
617 | goto out; | |
618 | } | |
619 | /* Released in this function */ | |
620 | lower_buf = kmalloc(bufsiz, GFP_KERNEL); | |
621 | if (lower_buf == NULL) { | |
622 | ecryptfs_printk(KERN_ERR, "Out of memory\n"); | |
623 | rc = -ENOMEM; | |
624 | goto out; | |
625 | } | |
626 | old_fs = get_fs(); | |
627 | set_fs(get_ds()); | |
628 | ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " | |
629 | "lower_dentry->d_name.name = [%s]\n", | |
630 | lower_dentry->d_name.name); | |
631 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, | |
632 | (char __user *)lower_buf, | |
633 | bufsiz); | |
634 | set_fs(old_fs); | |
635 | if (rc >= 0) { | |
636 | crypt_stat = NULL; | |
637 | rc = ecryptfs_decode_filename(crypt_stat, lower_buf, rc, | |
638 | &decoded_name); | |
639 | if (rc == -ENOMEM) | |
640 | goto out_free_lower_buf; | |
641 | if (rc > 0) { | |
642 | ecryptfs_printk(KERN_DEBUG, "Copying [%d] bytes " | |
643 | "to userspace: [%*s]\n", rc, | |
644 | decoded_name); | |
645 | if (copy_to_user(buf, decoded_name, rc)) | |
646 | rc = -EFAULT; | |
647 | } | |
648 | kfree(decoded_name); | |
0cc72dc7 JJS |
649 | fsstack_copy_attr_atime(dentry->d_inode, |
650 | lower_dentry->d_inode); | |
237fead6 MH |
651 | } |
652 | out_free_lower_buf: | |
653 | kfree(lower_buf); | |
654 | out: | |
655 | return rc; | |
656 | } | |
657 | ||
658 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
659 | { | |
660 | char *buf; | |
661 | int len = PAGE_SIZE, rc; | |
662 | mm_segment_t old_fs; | |
663 | ||
664 | /* Released in ecryptfs_put_link(); only release here on error */ | |
665 | buf = kmalloc(len, GFP_KERNEL); | |
666 | if (!buf) { | |
667 | rc = -ENOMEM; | |
668 | goto out; | |
669 | } | |
670 | old_fs = get_fs(); | |
671 | set_fs(get_ds()); | |
672 | ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " | |
673 | "dentry->d_name.name = [%s]\n", dentry->d_name.name); | |
674 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); | |
675 | buf[rc] = '\0'; | |
676 | set_fs(old_fs); | |
677 | if (rc < 0) | |
678 | goto out_free; | |
679 | rc = 0; | |
680 | nd_set_link(nd, buf); | |
681 | goto out; | |
682 | out_free: | |
683 | kfree(buf); | |
684 | out: | |
685 | return ERR_PTR(rc); | |
686 | } | |
687 | ||
688 | static void | |
689 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
690 | { | |
691 | /* Free the char* */ | |
692 | kfree(nd_get_link(nd)); | |
693 | } | |
694 | ||
695 | /** | |
696 | * upper_size_to_lower_size | |
697 | * @crypt_stat: Crypt_stat associated with file | |
698 | * @upper_size: Size of the upper file | |
699 | * | |
700 | * Calculate the requried size of the lower file based on the | |
701 | * specified size of the upper file. This calculation is based on the | |
702 | * number of headers in the underlying file and the extent size. | |
703 | * | |
704 | * Returns Calculated size of the lower file. | |
705 | */ | |
706 | static loff_t | |
707 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
708 | loff_t upper_size) | |
709 | { | |
710 | loff_t lower_size; | |
711 | ||
45eaab79 MH |
712 | lower_size = (crypt_stat->extent_size |
713 | * crypt_stat->num_header_extents_at_front); | |
237fead6 MH |
714 | if (upper_size != 0) { |
715 | loff_t num_extents; | |
716 | ||
717 | num_extents = upper_size >> crypt_stat->extent_shift; | |
718 | if (upper_size & ~crypt_stat->extent_mask) | |
719 | num_extents++; | |
720 | lower_size += (num_extents * crypt_stat->extent_size); | |
721 | } | |
722 | return lower_size; | |
723 | } | |
724 | ||
725 | /** | |
726 | * ecryptfs_truncate | |
727 | * @dentry: The ecryptfs layer dentry | |
728 | * @new_length: The length to expand the file to | |
729 | * | |
730 | * Function to handle truncations modifying the size of the file. Note | |
731 | * that the file sizes are interpolated. When expanding, we are simply | |
732 | * writing strings of 0's out. When truncating, we need to modify the | |
733 | * underlying file size according to the page index interpolations. | |
734 | * | |
735 | * Returns zero on success; non-zero otherwise | |
736 | */ | |
737 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
738 | { | |
739 | int rc = 0; | |
740 | struct inode *inode = dentry->d_inode; | |
741 | struct dentry *lower_dentry; | |
2ed92554 | 742 | struct file fake_ecryptfs_file; |
237fead6 MH |
743 | struct ecryptfs_crypt_stat *crypt_stat; |
744 | loff_t i_size = i_size_read(inode); | |
745 | loff_t lower_size_before_truncate; | |
746 | loff_t lower_size_after_truncate; | |
747 | ||
748 | if (unlikely((new_length == i_size))) | |
749 | goto out; | |
750 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
751 | /* Set up a fake ecryptfs file, this is used to interface with | |
752 | * the file in the underlying filesystem so that the | |
753 | * truncation has an effect there as well. */ | |
754 | memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file)); | |
bd243a4b | 755 | fake_ecryptfs_file.f_path.dentry = dentry; |
237fead6 MH |
756 | /* Released at out_free: label */ |
757 | ecryptfs_set_file_private(&fake_ecryptfs_file, | |
758 | kmem_cache_alloc(ecryptfs_file_info_cache, | |
e94b1766 | 759 | GFP_KERNEL)); |
237fead6 MH |
760 | if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) { |
761 | rc = -ENOMEM; | |
762 | goto out; | |
763 | } | |
764 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2ed92554 MH |
765 | ecryptfs_set_file_lower( |
766 | &fake_ecryptfs_file, | |
767 | ecryptfs_inode_to_private(dentry->d_inode)->lower_file); | |
237fead6 MH |
768 | /* Switch on growing or shrinking file */ |
769 | if (new_length > i_size) { | |
2ed92554 MH |
770 | char zero[] = { 0x00 }; |
771 | ||
772 | /* Write a single 0 at the last position of the file; | |
773 | * this triggers code that will fill in 0's throughout | |
774 | * the intermediate portion of the previous end of the | |
775 | * file and the new and of the file */ | |
776 | rc = ecryptfs_write(&fake_ecryptfs_file, zero, | |
777 | (new_length - 1), 1); | |
237fead6 | 778 | } else { /* new_length < i_size_read(inode) */ |
2ed92554 MH |
779 | /* We're chopping off all the pages down do the page |
780 | * in which new_length is located. Fill in the end of | |
781 | * that page from (new_length & ~PAGE_CACHE_MASK) to | |
782 | * PAGE_CACHE_SIZE with zeros. */ | |
783 | size_t num_zeros = (PAGE_CACHE_SIZE | |
784 | - (new_length & ~PAGE_CACHE_MASK)); | |
785 | ||
786 | if (num_zeros) { | |
787 | char *zeros_virt; | |
788 | ||
789 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
790 | if (!zeros_virt) { | |
791 | rc = -ENOMEM; | |
792 | goto out_free; | |
793 | } | |
794 | rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt, | |
795 | new_length, num_zeros); | |
796 | kfree(zeros_virt); | |
5dda6992 | 797 | if (rc) { |
240e2df5 MH |
798 | printk(KERN_ERR "Error attempting to zero out " |
799 | "the remainder of the end page on " | |
800 | "reducing truncate; rc = [%d]\n", rc); | |
2ed92554 | 801 | goto out_free; |
240e2df5 MH |
802 | } |
803 | } | |
237fead6 | 804 | vmtruncate(inode, new_length); |
0216f7f7 | 805 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
806 | if (rc) { |
807 | printk(KERN_ERR "Problem with " | |
808 | "ecryptfs_write_inode_size_to_metadata; " | |
809 | "rc = [%d]\n", rc); | |
2ed92554 | 810 | goto out_free; |
dd2a3b7a | 811 | } |
237fead6 MH |
812 | /* We are reducing the size of the ecryptfs file, and need to |
813 | * know if we need to reduce the size of the lower file. */ | |
814 | lower_size_before_truncate = | |
815 | upper_size_to_lower_size(crypt_stat, i_size); | |
816 | lower_size_after_truncate = | |
817 | upper_size_to_lower_size(crypt_stat, new_length); | |
818 | if (lower_size_after_truncate < lower_size_before_truncate) | |
819 | vmtruncate(lower_dentry->d_inode, | |
820 | lower_size_after_truncate); | |
821 | } | |
237fead6 MH |
822 | out_free: |
823 | if (ecryptfs_file_to_private(&fake_ecryptfs_file)) | |
824 | kmem_cache_free(ecryptfs_file_info_cache, | |
825 | ecryptfs_file_to_private(&fake_ecryptfs_file)); | |
826 | out: | |
827 | return rc; | |
828 | } | |
829 | ||
830 | static int | |
831 | ecryptfs_permission(struct inode *inode, int mask, struct nameidata *nd) | |
832 | { | |
833 | int rc; | |
834 | ||
835 | if (nd) { | |
836 | struct vfsmount *vfsmnt_save = nd->mnt; | |
837 | struct dentry *dentry_save = nd->dentry; | |
838 | ||
839 | nd->mnt = ecryptfs_dentry_to_lower_mnt(nd->dentry); | |
840 | nd->dentry = ecryptfs_dentry_to_lower(nd->dentry); | |
841 | rc = permission(ecryptfs_inode_to_lower(inode), mask, nd); | |
842 | nd->mnt = vfsmnt_save; | |
843 | nd->dentry = dentry_save; | |
844 | } else | |
845 | rc = permission(ecryptfs_inode_to_lower(inode), mask, NULL); | |
846 | return rc; | |
847 | } | |
848 | ||
849 | /** | |
850 | * ecryptfs_setattr | |
851 | * @dentry: dentry handle to the inode to modify | |
852 | * @ia: Structure with flags of what to change and values | |
853 | * | |
854 | * Updates the metadata of an inode. If the update is to the size | |
855 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
856 | * of both the ecryptfs inode and the lower inode. | |
857 | * | |
858 | * All other metadata changes will be passed right to the lower filesystem, | |
859 | * and we will just update our inode to look like the lower. | |
860 | */ | |
861 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
862 | { | |
863 | int rc = 0; | |
864 | struct dentry *lower_dentry; | |
865 | struct inode *inode; | |
866 | struct inode *lower_inode; | |
867 | struct ecryptfs_crypt_stat *crypt_stat; | |
868 | ||
869 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
870 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
871 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
872 | inode = dentry->d_inode; |
873 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
874 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
875 | mutex_lock(&crypt_stat->cs_mutex); | |
876 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
877 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
878 | else if (S_ISREG(dentry->d_inode->i_mode) |
879 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
880 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 881 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 882 | |
e10f281b MH |
883 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
884 | dentry->d_sb)->mount_crypt_stat; | |
d7cdc5fe | 885 | rc = ecryptfs_read_metadata(dentry); |
5dda6992 | 886 | if (rc) { |
e10f281b MH |
887 | if (!(mount_crypt_stat->flags |
888 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
889 | rc = -EIO; | |
890 | printk(KERN_WARNING "Attempt to read file that " | |
891 | "is not in a valid eCryptfs format, " | |
892 | "and plaintext passthrough mode is not " | |
893 | "enabled; returning -EIO\n"); | |
894 | ||
895 | mutex_unlock(&crypt_stat->cs_mutex); | |
e10f281b MH |
896 | goto out; |
897 | } | |
898 | rc = 0; | |
899 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
900 | mutex_unlock(&crypt_stat->cs_mutex); | |
e10f281b MH |
901 | goto out; |
902 | } | |
e10f281b MH |
903 | } |
904 | mutex_unlock(&crypt_stat->cs_mutex); | |
237fead6 MH |
905 | if (ia->ia_valid & ATTR_SIZE) { |
906 | ecryptfs_printk(KERN_DEBUG, | |
907 | "ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n", | |
908 | ia->ia_valid, ATTR_SIZE); | |
909 | rc = ecryptfs_truncate(dentry, ia->ia_size); | |
910 | /* ecryptfs_truncate handles resizing of the lower file */ | |
911 | ia->ia_valid &= ~ATTR_SIZE; | |
912 | ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [%x]\n", | |
913 | ia->ia_valid); | |
914 | if (rc < 0) | |
915 | goto out; | |
916 | } | |
1ac564ec JL |
917 | |
918 | /* | |
919 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
920 | * to interpret this in its own way. | |
921 | */ | |
922 | if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) | |
923 | ia->ia_valid &= ~ATTR_MODE; | |
924 | ||
237fead6 MH |
925 | rc = notify_change(lower_dentry, ia); |
926 | out: | |
0cc72dc7 | 927 | fsstack_copy_attr_all(inode, lower_inode, NULL); |
237fead6 MH |
928 | return rc; |
929 | } | |
930 | ||
dd2a3b7a | 931 | int |
237fead6 MH |
932 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
933 | size_t size, int flags) | |
934 | { | |
935 | int rc = 0; | |
936 | struct dentry *lower_dentry; | |
937 | ||
938 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
939 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
940 | rc = -ENOSYS; | |
941 | goto out; | |
942 | } | |
943 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
944 | rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, | |
945 | size, flags); | |
946 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
947 | out: | |
948 | return rc; | |
949 | } | |
950 | ||
d7cdc5fe MH |
951 | ssize_t |
952 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
953 | void *value, size_t size) | |
954 | { | |
955 | int rc = 0; | |
956 | ||
957 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
958 | rc = -ENOSYS; | |
959 | goto out; | |
960 | } | |
961 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
962 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
963 | size); | |
964 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
965 | out: | |
966 | return rc; | |
967 | } | |
968 | ||
dd2a3b7a | 969 | ssize_t |
237fead6 MH |
970 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
971 | size_t size) | |
972 | { | |
2ed92554 MH |
973 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
974 | value, size); | |
237fead6 MH |
975 | } |
976 | ||
977 | static ssize_t | |
978 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
979 | { | |
980 | int rc = 0; | |
981 | struct dentry *lower_dentry; | |
982 | ||
983 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
984 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
985 | rc = -ENOSYS; | |
986 | goto out; | |
987 | } | |
988 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
989 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
990 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
991 | out: | |
992 | return rc; | |
993 | } | |
994 | ||
995 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
996 | { | |
997 | int rc = 0; | |
998 | struct dentry *lower_dentry; | |
999 | ||
1000 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1001 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
1002 | rc = -ENOSYS; | |
1003 | goto out; | |
1004 | } | |
1005 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1006 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
1007 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1008 | out: | |
1009 | return rc; | |
1010 | } | |
1011 | ||
1012 | int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) | |
1013 | { | |
1014 | if ((ecryptfs_inode_to_lower(inode) | |
1015 | == (struct inode *)candidate_lower_inode)) | |
1016 | return 1; | |
1017 | else | |
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | int ecryptfs_inode_set(struct inode *inode, void *lower_inode) | |
1022 | { | |
1023 | ecryptfs_init_inode(inode, (struct inode *)lower_inode); | |
1024 | return 0; | |
1025 | } | |
1026 | ||
754661f1 | 1027 | const struct inode_operations ecryptfs_symlink_iops = { |
237fead6 MH |
1028 | .readlink = ecryptfs_readlink, |
1029 | .follow_link = ecryptfs_follow_link, | |
1030 | .put_link = ecryptfs_put_link, | |
1031 | .permission = ecryptfs_permission, | |
1032 | .setattr = ecryptfs_setattr, | |
1033 | .setxattr = ecryptfs_setxattr, | |
1034 | .getxattr = ecryptfs_getxattr, | |
1035 | .listxattr = ecryptfs_listxattr, | |
1036 | .removexattr = ecryptfs_removexattr | |
1037 | }; | |
1038 | ||
754661f1 | 1039 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1040 | .create = ecryptfs_create, |
1041 | .lookup = ecryptfs_lookup, | |
1042 | .link = ecryptfs_link, | |
1043 | .unlink = ecryptfs_unlink, | |
1044 | .symlink = ecryptfs_symlink, | |
1045 | .mkdir = ecryptfs_mkdir, | |
1046 | .rmdir = ecryptfs_rmdir, | |
1047 | .mknod = ecryptfs_mknod, | |
1048 | .rename = ecryptfs_rename, | |
1049 | .permission = ecryptfs_permission, | |
1050 | .setattr = ecryptfs_setattr, | |
1051 | .setxattr = ecryptfs_setxattr, | |
1052 | .getxattr = ecryptfs_getxattr, | |
1053 | .listxattr = ecryptfs_listxattr, | |
1054 | .removexattr = ecryptfs_removexattr | |
1055 | }; | |
1056 | ||
754661f1 | 1057 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1058 | .permission = ecryptfs_permission, |
1059 | .setattr = ecryptfs_setattr, | |
1060 | .setxattr = ecryptfs_setxattr, | |
1061 | .getxattr = ecryptfs_getxattr, | |
1062 | .listxattr = ecryptfs_listxattr, | |
1063 | .removexattr = ecryptfs_removexattr | |
1064 | }; |