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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> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
48b512e6 | 35 | #include <linux/xattr.h> |
0a688ad7 | 36 | #include <asm/unaligned.h> |
237fead6 MH |
37 | #include "ecryptfs_kernel.h" |
38 | ||
39 | static struct dentry *lock_parent(struct dentry *dentry) | |
40 | { | |
41 | struct dentry *dir; | |
42 | ||
8dc4e373 | 43 | dir = dget_parent(dentry); |
908e0a8a | 44 | mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); |
237fead6 MH |
45 | return dir; |
46 | } | |
47 | ||
237fead6 MH |
48 | static void unlock_dir(struct dentry *dir) |
49 | { | |
50 | mutex_unlock(&dir->d_inode->i_mutex); | |
51 | dput(dir); | |
52 | } | |
53 | ||
237fead6 MH |
54 | /** |
55 | * ecryptfs_create_underlying_file | |
56 | * @lower_dir_inode: inode of the parent in the lower fs of the new file | |
f70f582f | 57 | * @dentry: New file's dentry |
237fead6 MH |
58 | * @mode: The mode of the new file |
59 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
60 | * | |
61 | * Creates the file in the lower file system. | |
62 | * | |
63 | * Returns zero on success; non-zero on error condition | |
64 | */ | |
65 | static int | |
66 | ecryptfs_create_underlying_file(struct inode *lower_dir_inode, | |
67 | struct dentry *dentry, int mode, | |
68 | struct nameidata *nd) | |
69 | { | |
70 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
71 | struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); | |
72 | struct dentry *dentry_save; | |
73 | struct vfsmount *vfsmount_save; | |
2e21b3f1 | 74 | unsigned int flags_save; |
237fead6 MH |
75 | int rc; |
76 | ||
70b89021 TH |
77 | if (nd) { |
78 | dentry_save = nd->path.dentry; | |
79 | vfsmount_save = nd->path.mnt; | |
80 | flags_save = nd->flags; | |
81 | nd->path.dentry = lower_dentry; | |
82 | nd->path.mnt = lower_mnt; | |
83 | nd->flags &= ~LOOKUP_OPEN; | |
84 | } | |
237fead6 | 85 | rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); |
70b89021 TH |
86 | if (nd) { |
87 | nd->path.dentry = dentry_save; | |
88 | nd->path.mnt = vfsmount_save; | |
89 | nd->flags = flags_save; | |
90 | } | |
237fead6 MH |
91 | return rc; |
92 | } | |
93 | ||
94 | /** | |
95 | * ecryptfs_do_create | |
96 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
97 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
98 | * @mode: The mode of the new file | |
99 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
100 | * | |
101 | * Creates the underlying file and the eCryptfs inode which will link to | |
102 | * it. It will also update the eCryptfs directory inode to mimic the | |
103 | * stat of the lower directory inode. | |
104 | * | |
105 | * Returns zero on success; non-zero on error condition | |
106 | */ | |
107 | static int | |
108 | ecryptfs_do_create(struct inode *directory_inode, | |
109 | struct dentry *ecryptfs_dentry, int mode, | |
110 | struct nameidata *nd) | |
111 | { | |
112 | int rc; | |
113 | struct dentry *lower_dentry; | |
114 | struct dentry *lower_dir_dentry; | |
115 | ||
116 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
117 | lower_dir_dentry = lock_parent(lower_dentry); | |
801678c5 | 118 | if (IS_ERR(lower_dir_dentry)) { |
237fead6 MH |
119 | ecryptfs_printk(KERN_ERR, "Error locking directory of " |
120 | "dentry\n"); | |
121 | rc = PTR_ERR(lower_dir_dentry); | |
122 | goto out; | |
123 | } | |
124 | rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, | |
125 | ecryptfs_dentry, mode, nd); | |
4981e081 | 126 | if (rc) { |
caeeeecf | 127 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 128 | "rc = [%d]\n", __func__, rc); |
caeeeecf | 129 | goto out_lock; |
237fead6 MH |
130 | } |
131 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, | |
132 | directory_inode->i_sb, 0); | |
133 | if (rc) { | |
134 | ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); | |
135 | goto out_lock; | |
136 | } | |
0cc72dc7 JJS |
137 | fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); |
138 | fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); | |
237fead6 MH |
139 | out_lock: |
140 | unlock_dir(lower_dir_dentry); | |
141 | out: | |
142 | return rc; | |
143 | } | |
144 | ||
237fead6 MH |
145 | /** |
146 | * ecryptfs_initialize_file | |
147 | * | |
148 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
149 | * file with a header and first data page. | |
150 | * | |
151 | * Returns zero on success | |
152 | */ | |
153 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) | |
154 | { | |
d7cdc5fe MH |
155 | struct ecryptfs_crypt_stat *crypt_stat = |
156 | &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; | |
237fead6 | 157 | int rc = 0; |
237fead6 | 158 | |
237fead6 MH |
159 | if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { |
160 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); | |
e2bd99ec | 161 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 162 | goto out; |
237fead6 | 163 | } |
e2bd99ec | 164 | crypt_stat->flags |= ECRYPTFS_NEW_FILE; |
237fead6 MH |
165 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
166 | rc = ecryptfs_new_file_context(ecryptfs_dentry); | |
167 | if (rc) { | |
d7cdc5fe MH |
168 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
169 | "context; rc = [%d]\n", rc); | |
170 | goto out; | |
237fead6 | 171 | } |
27992890 RS |
172 | rc = ecryptfs_init_persistent_file(ecryptfs_dentry); |
173 | if (rc) { | |
174 | printk(KERN_ERR "%s: Error attempting to initialize " | |
175 | "the persistent file for the dentry with name " | |
176 | "[%s]; rc = [%d]\n", __func__, | |
177 | ecryptfs_dentry->d_name.name, rc); | |
178 | goto out; | |
391b52f9 | 179 | } |
d7cdc5fe | 180 | rc = ecryptfs_write_metadata(ecryptfs_dentry); |
237fead6 | 181 | if (rc) { |
d7cdc5fe MH |
182 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
183 | goto out; | |
237fead6 | 184 | } |
237fead6 MH |
185 | out: |
186 | return rc; | |
187 | } | |
188 | ||
189 | /** | |
190 | * ecryptfs_create | |
191 | * @dir: The inode of the directory in which to create the file. | |
192 | * @dentry: The eCryptfs dentry | |
193 | * @mode: The mode of the new file. | |
194 | * @nd: nameidata | |
195 | * | |
196 | * Creates a new file. | |
197 | * | |
198 | * Returns zero on success; non-zero on error condition | |
199 | */ | |
200 | static int | |
201 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
202 | int mode, struct nameidata *nd) | |
203 | { | |
204 | int rc; | |
205 | ||
addd65ad | 206 | /* ecryptfs_do_create() calls ecryptfs_interpose() */ |
237fead6 MH |
207 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); |
208 | if (unlikely(rc)) { | |
209 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" | |
210 | "lower filesystem\n"); | |
211 | goto out; | |
212 | } | |
213 | /* At this point, a file exists on "disk"; we need to make sure | |
214 | * that this on disk file is prepared to be an ecryptfs file */ | |
215 | rc = ecryptfs_initialize_file(ecryptfs_dentry); | |
216 | out: | |
217 | return rc; | |
218 | } | |
219 | ||
220 | /** | |
addd65ad | 221 | * ecryptfs_lookup_and_interpose_lower - Perform a lookup |
237fead6 | 222 | */ |
addd65ad MH |
223 | int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, |
224 | struct dentry *lower_dentry, | |
70b89021 | 225 | struct inode *ecryptfs_dir_inode) |
237fead6 | 226 | { |
237fead6 | 227 | struct dentry *lower_dir_dentry; |
237fead6 | 228 | struct vfsmount *lower_mnt; |
addd65ad | 229 | struct inode *lower_inode; |
e77a56dd | 230 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
2aac0cf8 | 231 | struct ecryptfs_crypt_stat *crypt_stat; |
237fead6 | 232 | char *page_virt = NULL; |
237fead6 | 233 | u64 file_size; |
addd65ad | 234 | int rc = 0; |
237fead6 | 235 | |
addd65ad MH |
236 | lower_dir_dentry = lower_dentry->d_parent; |
237 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( | |
238 | ecryptfs_dentry->d_parent)); | |
237fead6 | 239 | lower_inode = lower_dentry->d_inode; |
addd65ad | 240 | fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); |
b7ab39f6 | 241 | BUG_ON(!lower_dentry->d_count); |
addd65ad | 242 | ecryptfs_set_dentry_private(ecryptfs_dentry, |
237fead6 | 243 | kmem_cache_alloc(ecryptfs_dentry_info_cache, |
e94b1766 | 244 | GFP_KERNEL)); |
addd65ad | 245 | if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { |
237fead6 | 246 | rc = -ENOMEM; |
addd65ad MH |
247 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
248 | "to allocate ecryptfs_dentry_info struct\n", | |
249 | __func__); | |
31f73bee | 250 | goto out_put; |
237fead6 | 251 | } |
addd65ad MH |
252 | ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); |
253 | ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); | |
237fead6 MH |
254 | if (!lower_dentry->d_inode) { |
255 | /* We want to add because we couldn't find in lower */ | |
addd65ad | 256 | d_add(ecryptfs_dentry, NULL); |
237fead6 MH |
257 | goto out; |
258 | } | |
addd65ad | 259 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, |
3469b573 EZ |
260 | ecryptfs_dir_inode->i_sb, |
261 | ECRYPTFS_INTERPOSE_FLAG_D_ADD); | |
237fead6 | 262 | if (rc) { |
addd65ad MH |
263 | printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", |
264 | __func__, rc); | |
391b52f9 | 265 | goto out; |
237fead6 | 266 | } |
addd65ad | 267 | if (S_ISDIR(lower_inode->i_mode)) |
237fead6 | 268 | goto out; |
addd65ad | 269 | if (S_ISLNK(lower_inode->i_mode)) |
237fead6 | 270 | goto out; |
addd65ad | 271 | if (special_file(lower_inode->i_mode)) |
202a21d6 | 272 | goto out; |
237fead6 | 273 | /* Released in this function */ |
addd65ad | 274 | page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); |
237fead6 | 275 | if (!page_virt) { |
addd65ad MH |
276 | printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", |
277 | __func__); | |
237fead6 | 278 | rc = -ENOMEM; |
391b52f9 | 279 | goto out; |
237fead6 | 280 | } |
27992890 RS |
281 | rc = ecryptfs_init_persistent_file(ecryptfs_dentry); |
282 | if (rc) { | |
283 | printk(KERN_ERR "%s: Error attempting to initialize " | |
284 | "the persistent file for the dentry with name " | |
285 | "[%s]; rc = [%d]\n", __func__, | |
286 | ecryptfs_dentry->d_name.name, rc); | |
287 | goto out_free_kmem; | |
391b52f9 | 288 | } |
2aac0cf8 TH |
289 | crypt_stat = &ecryptfs_inode_to_private( |
290 | ecryptfs_dentry->d_inode)->crypt_stat; | |
291 | /* TODO: lock for crypt_stat comparison */ | |
292 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
293 | ecryptfs_set_default_sizes(crypt_stat); | |
d7cdc5fe | 294 | rc = ecryptfs_read_and_validate_header_region(page_virt, |
addd65ad | 295 | ecryptfs_dentry->d_inode); |
237fead6 | 296 | if (rc) { |
1984c23f | 297 | memset(page_virt, 0, PAGE_CACHE_SIZE); |
addd65ad MH |
298 | rc = ecryptfs_read_and_validate_xattr_region(page_virt, |
299 | ecryptfs_dentry); | |
dd2a3b7a | 300 | if (rc) { |
dd2a3b7a | 301 | rc = 0; |
addd65ad | 302 | goto out_free_kmem; |
237fead6 | 303 | } |
dd2a3b7a | 304 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
237fead6 | 305 | } |
e77a56dd | 306 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
addd65ad | 307 | ecryptfs_dentry->d_sb)->mount_crypt_stat; |
e77a56dd MH |
308 | if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { |
309 | if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) | |
fa3ef1cb | 310 | file_size = (crypt_stat->metadata_size |
e77a56dd MH |
311 | + i_size_read(lower_dentry->d_inode)); |
312 | else | |
313 | file_size = i_size_read(lower_dentry->d_inode); | |
314 | } else { | |
0a688ad7 | 315 | file_size = get_unaligned_be64(page_virt); |
e77a56dd | 316 | } |
addd65ad MH |
317 | i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size); |
318 | out_free_kmem: | |
237fead6 MH |
319 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
320 | goto out; | |
31f73bee | 321 | out_put: |
237fead6 | 322 | dput(lower_dentry); |
31f73bee | 323 | mntput(lower_mnt); |
addd65ad MH |
324 | d_drop(ecryptfs_dentry); |
325 | out: | |
326 | return rc; | |
327 | } | |
328 | ||
329 | /** | |
330 | * ecryptfs_lookup | |
331 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
332 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
333 | * @ecryptfs_nd: nameidata; may be NULL | |
334 | * | |
335 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
336 | * dentry cache and continue on to read it from the disk. | |
337 | */ | |
338 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
339 | struct dentry *ecryptfs_dentry, | |
340 | struct nameidata *ecryptfs_nd) | |
341 | { | |
342 | char *encrypted_and_encoded_name = NULL; | |
a8f12864 | 343 | size_t encrypted_and_encoded_name_size; |
addd65ad | 344 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
addd65ad MH |
345 | struct dentry *lower_dir_dentry, *lower_dentry; |
346 | int rc = 0; | |
347 | ||
addd65ad MH |
348 | if ((ecryptfs_dentry->d_name.len == 1 |
349 | && !strcmp(ecryptfs_dentry->d_name.name, ".")) | |
350 | || (ecryptfs_dentry->d_name.len == 2 | |
351 | && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { | |
352 | goto out_d_drop; | |
353 | } | |
354 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); | |
8787c7a3 TH |
355 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
356 | lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, | |
357 | lower_dir_dentry, | |
358 | ecryptfs_dentry->d_name.len); | |
359 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
360 | if (IS_ERR(lower_dentry)) { |
361 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 362 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
363 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
364 | encrypted_and_encoded_name); | |
addd65ad MH |
365 | goto out_d_drop; |
366 | } | |
367 | if (lower_dentry->d_inode) | |
368 | goto lookup_and_interpose; | |
2aac0cf8 TH |
369 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
370 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
371 | if (!(mount_crypt_stat | |
372 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) | |
addd65ad MH |
373 | goto lookup_and_interpose; |
374 | dput(lower_dentry); | |
375 | rc = ecryptfs_encrypt_and_encode_filename( | |
376 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, | |
2aac0cf8 | 377 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
addd65ad MH |
378 | ecryptfs_dentry->d_name.len); |
379 | if (rc) { | |
380 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
381 | "filename; rc = [%d]\n", __func__, rc); | |
382 | goto out_d_drop; | |
383 | } | |
8787c7a3 TH |
384 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
385 | lower_dentry = lookup_one_len(encrypted_and_encoded_name, | |
386 | lower_dir_dentry, | |
387 | encrypted_and_encoded_name_size); | |
388 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
389 | if (IS_ERR(lower_dentry)) { |
390 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 391 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
392 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
393 | encrypted_and_encoded_name); | |
addd65ad MH |
394 | goto out_d_drop; |
395 | } | |
396 | lookup_and_interpose: | |
397 | rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, | |
70b89021 | 398 | ecryptfs_dir_inode); |
addd65ad MH |
399 | goto out; |
400 | out_d_drop: | |
401 | d_drop(ecryptfs_dentry); | |
237fead6 | 402 | out: |
addd65ad | 403 | kfree(encrypted_and_encoded_name); |
237fead6 MH |
404 | return ERR_PTR(rc); |
405 | } | |
406 | ||
407 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
408 | struct dentry *new_dentry) | |
409 | { | |
410 | struct dentry *lower_old_dentry; | |
411 | struct dentry *lower_new_dentry; | |
412 | struct dentry *lower_dir_dentry; | |
413 | u64 file_size_save; | |
414 | int rc; | |
415 | ||
416 | file_size_save = i_size_read(old_dentry->d_inode); | |
417 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
418 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
419 | dget(lower_old_dentry); | |
420 | dget(lower_new_dentry); | |
421 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
422 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
423 | lower_new_dentry); | |
424 | if (rc || !lower_new_dentry->d_inode) | |
425 | goto out_lock; | |
426 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); | |
427 | if (rc) | |
428 | goto out_lock; | |
3a8380c0 TH |
429 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
430 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
431 | old_dentry->d_inode->i_nlink = |
432 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; | |
433 | i_size_write(new_dentry->d_inode, file_size_save); | |
434 | out_lock: | |
435 | unlock_dir(lower_dir_dentry); | |
436 | dput(lower_new_dentry); | |
437 | dput(lower_old_dentry); | |
237fead6 MH |
438 | return rc; |
439 | } | |
440 | ||
441 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
442 | { | |
443 | int rc = 0; | |
444 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
445 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
8dc4e373 | 446 | struct dentry *lower_dir_dentry; |
237fead6 | 447 | |
9c2d2056 | 448 | dget(lower_dentry); |
8dc4e373 | 449 | lower_dir_dentry = lock_parent(lower_dentry); |
237fead6 MH |
450 | rc = vfs_unlink(lower_dir_inode, lower_dentry); |
451 | if (rc) { | |
ae56fb16 | 452 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
453 | goto out_unlock; |
454 | } | |
0cc72dc7 | 455 | fsstack_copy_attr_times(dir, lower_dir_inode); |
237fead6 MH |
456 | dentry->d_inode->i_nlink = |
457 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; | |
458 | dentry->d_inode->i_ctime = dir->i_ctime; | |
caeeeecf | 459 | d_drop(dentry); |
237fead6 | 460 | out_unlock: |
8dc4e373 | 461 | unlock_dir(lower_dir_dentry); |
9c2d2056 | 462 | dput(lower_dentry); |
237fead6 MH |
463 | return rc; |
464 | } | |
465 | ||
466 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
467 | const char *symname) | |
468 | { | |
469 | int rc; | |
470 | struct dentry *lower_dentry; | |
471 | struct dentry *lower_dir_dentry; | |
237fead6 | 472 | char *encoded_symname; |
addd65ad MH |
473 | size_t encoded_symlen; |
474 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
475 | |
476 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
477 | dget(lower_dentry); | |
478 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
479 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
480 | dir->i_sb)->mount_crypt_stat; | |
481 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
482 | &encoded_symlen, | |
483 | NULL, | |
484 | mount_crypt_stat, symname, | |
485 | strlen(symname)); | |
486 | if (rc) | |
237fead6 | 487 | goto out_lock; |
237fead6 | 488 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, |
db2e747b | 489 | encoded_symname); |
237fead6 MH |
490 | kfree(encoded_symname); |
491 | if (rc || !lower_dentry->d_inode) | |
492 | goto out_lock; | |
493 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
494 | if (rc) | |
495 | goto out_lock; | |
0cc72dc7 JJS |
496 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
497 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
498 | out_lock: |
499 | unlock_dir(lower_dir_dentry); | |
500 | dput(lower_dentry); | |
501 | if (!dentry->d_inode) | |
502 | d_drop(dentry); | |
503 | return rc; | |
504 | } | |
505 | ||
506 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
507 | { | |
508 | int rc; | |
509 | struct dentry *lower_dentry; | |
510 | struct dentry *lower_dir_dentry; | |
511 | ||
512 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
513 | lower_dir_dentry = lock_parent(lower_dentry); | |
514 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
515 | if (rc || !lower_dentry->d_inode) | |
516 | goto out; | |
517 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
518 | if (rc) | |
519 | goto out; | |
0cc72dc7 JJS |
520 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
521 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
522 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
523 | out: | |
524 | unlock_dir(lower_dir_dentry); | |
525 | if (!dentry->d_inode) | |
526 | d_drop(dentry); | |
527 | return rc; | |
528 | } | |
529 | ||
530 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
531 | { | |
237fead6 | 532 | struct dentry *lower_dentry; |
237fead6 | 533 | struct dentry *lower_dir_dentry; |
45ec4aba | 534 | int rc; |
237fead6 MH |
535 | |
536 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 537 | dget(dentry); |
237fead6 | 538 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 539 | dget(lower_dentry); |
237fead6 | 540 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba MH |
541 | dput(lower_dentry); |
542 | if (!rc) | |
543 | d_delete(lower_dentry); | |
0cc72dc7 | 544 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
545 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
546 | unlock_dir(lower_dir_dentry); | |
547 | if (!rc) | |
548 | d_drop(dentry); | |
45ec4aba | 549 | dput(dentry); |
237fead6 MH |
550 | return rc; |
551 | } | |
552 | ||
553 | static int | |
554 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
555 | { | |
556 | int rc; | |
557 | struct dentry *lower_dentry; | |
558 | struct dentry *lower_dir_dentry; | |
559 | ||
560 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
561 | lower_dir_dentry = lock_parent(lower_dentry); | |
562 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
563 | if (rc || !lower_dentry->d_inode) | |
564 | goto out; | |
391b52f9 | 565 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); |
237fead6 MH |
566 | if (rc) |
567 | goto out; | |
0cc72dc7 JJS |
568 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
569 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
570 | out: |
571 | unlock_dir(lower_dir_dentry); | |
572 | if (!dentry->d_inode) | |
573 | d_drop(dentry); | |
574 | return rc; | |
575 | } | |
576 | ||
577 | static int | |
578 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
579 | struct inode *new_dir, struct dentry *new_dentry) | |
580 | { | |
581 | int rc; | |
582 | struct dentry *lower_old_dentry; | |
583 | struct dentry *lower_new_dentry; | |
584 | struct dentry *lower_old_dir_dentry; | |
585 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 586 | struct dentry *trap = NULL; |
237fead6 MH |
587 | |
588 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
589 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
590 | dget(lower_old_dentry); | |
591 | dget(lower_new_dentry); | |
592 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
593 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
0d132f73 EZ |
594 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
595 | /* source should not be ancestor of target */ | |
596 | if (trap == lower_old_dentry) { | |
597 | rc = -EINVAL; | |
598 | goto out_lock; | |
599 | } | |
600 | /* target should not be ancestor of source */ | |
601 | if (trap == lower_new_dentry) { | |
602 | rc = -ENOTEMPTY; | |
603 | goto out_lock; | |
604 | } | |
237fead6 MH |
605 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, |
606 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
607 | if (rc) | |
608 | goto out_lock; | |
9afa2fb6 | 609 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); |
237fead6 | 610 | if (new_dir != old_dir) |
9afa2fb6 | 611 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); |
237fead6 MH |
612 | out_lock: |
613 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
a9083081 MH |
614 | dput(lower_new_dentry->d_parent); |
615 | dput(lower_old_dentry->d_parent); | |
237fead6 MH |
616 | dput(lower_new_dentry); |
617 | dput(lower_old_dentry); | |
618 | return rc; | |
619 | } | |
620 | ||
3a60a168 TH |
621 | static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, |
622 | size_t *bufsiz) | |
237fead6 | 623 | { |
3a60a168 | 624 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
237fead6 | 625 | char *lower_buf; |
3a60a168 | 626 | size_t lower_bufsiz = PATH_MAX; |
addd65ad MH |
627 | mm_segment_t old_fs; |
628 | int rc; | |
237fead6 | 629 | |
3a6b42ca | 630 | lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); |
3a60a168 | 631 | if (!lower_buf) { |
237fead6 MH |
632 | rc = -ENOMEM; |
633 | goto out; | |
634 | } | |
635 | old_fs = get_fs(); | |
636 | set_fs(get_ds()); | |
237fead6 MH |
637 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, |
638 | (char __user *)lower_buf, | |
3a6b42ca | 639 | lower_bufsiz); |
237fead6 | 640 | set_fs(old_fs); |
3a60a168 TH |
641 | if (rc < 0) |
642 | goto out; | |
643 | lower_bufsiz = rc; | |
644 | rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, | |
645 | lower_buf, lower_bufsiz); | |
646 | out: | |
237fead6 | 647 | kfree(lower_buf); |
3a60a168 TH |
648 | return rc; |
649 | } | |
650 | ||
651 | static int | |
652 | ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) | |
653 | { | |
654 | char *kbuf; | |
655 | size_t kbufsiz, copied; | |
656 | int rc; | |
657 | ||
658 | rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); | |
659 | if (rc) | |
660 | goto out; | |
661 | copied = min_t(size_t, bufsiz, kbufsiz); | |
662 | rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; | |
663 | kfree(kbuf); | |
664 | fsstack_copy_attr_atime(dentry->d_inode, | |
665 | ecryptfs_dentry_to_lower(dentry)->d_inode); | |
237fead6 MH |
666 | out: |
667 | return rc; | |
668 | } | |
669 | ||
670 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
671 | { | |
672 | char *buf; | |
673 | int len = PAGE_SIZE, rc; | |
674 | mm_segment_t old_fs; | |
675 | ||
676 | /* Released in ecryptfs_put_link(); only release here on error */ | |
677 | buf = kmalloc(len, GFP_KERNEL); | |
678 | if (!buf) { | |
806892e9 | 679 | buf = ERR_PTR(-ENOMEM); |
237fead6 MH |
680 | goto out; |
681 | } | |
682 | old_fs = get_fs(); | |
683 | set_fs(get_ds()); | |
237fead6 | 684 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); |
237fead6 | 685 | set_fs(old_fs); |
806892e9 OH |
686 | if (rc < 0) { |
687 | kfree(buf); | |
688 | buf = ERR_PTR(rc); | |
689 | } else | |
a17d5232 | 690 | buf[rc] = '\0'; |
237fead6 | 691 | out: |
806892e9 OH |
692 | nd_set_link(nd, buf); |
693 | return NULL; | |
237fead6 MH |
694 | } |
695 | ||
696 | static void | |
697 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
698 | { | |
806892e9 OH |
699 | char *buf = nd_get_link(nd); |
700 | if (!IS_ERR(buf)) { | |
701 | /* Free the char* */ | |
702 | kfree(buf); | |
703 | } | |
237fead6 MH |
704 | } |
705 | ||
706 | /** | |
707 | * upper_size_to_lower_size | |
708 | * @crypt_stat: Crypt_stat associated with file | |
709 | * @upper_size: Size of the upper file | |
710 | * | |
cc11beff | 711 | * Calculate the required size of the lower file based on the |
237fead6 MH |
712 | * specified size of the upper file. This calculation is based on the |
713 | * number of headers in the underlying file and the extent size. | |
714 | * | |
715 | * Returns Calculated size of the lower file. | |
716 | */ | |
717 | static loff_t | |
718 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
719 | loff_t upper_size) | |
720 | { | |
721 | loff_t lower_size; | |
722 | ||
157f1071 | 723 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
724 | if (upper_size != 0) { |
725 | loff_t num_extents; | |
726 | ||
727 | num_extents = upper_size >> crypt_stat->extent_shift; | |
728 | if (upper_size & ~crypt_stat->extent_mask) | |
729 | num_extents++; | |
730 | lower_size += (num_extents * crypt_stat->extent_size); | |
731 | } | |
732 | return lower_size; | |
733 | } | |
734 | ||
735 | /** | |
5f3ef64f | 736 | * truncate_upper |
237fead6 | 737 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
738 | * @ia: Address of the ecryptfs inode's attributes |
739 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
740 | * |
741 | * Function to handle truncations modifying the size of the file. Note | |
742 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
743 | * writing strings of 0's out. When truncating, we truncate the upper |
744 | * inode and update the lower_ia according to the page index | |
745 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
746 | * the caller must use lower_ia in a call to notify_change() to perform | |
747 | * the truncation of the lower inode. | |
237fead6 MH |
748 | * |
749 | * Returns zero on success; non-zero otherwise | |
750 | */ | |
5f3ef64f TH |
751 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
752 | struct iattr *lower_ia) | |
237fead6 MH |
753 | { |
754 | int rc = 0; | |
755 | struct inode *inode = dentry->d_inode; | |
237fead6 MH |
756 | struct ecryptfs_crypt_stat *crypt_stat; |
757 | loff_t i_size = i_size_read(inode); | |
758 | loff_t lower_size_before_truncate; | |
759 | loff_t lower_size_after_truncate; | |
760 | ||
5f3ef64f TH |
761 | if (unlikely((ia->ia_size == i_size))) { |
762 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 763 | goto out; |
5f3ef64f | 764 | } |
237fead6 | 765 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
237fead6 | 766 | /* Switch on growing or shrinking file */ |
5f3ef64f | 767 | if (ia->ia_size > i_size) { |
2ed92554 MH |
768 | char zero[] = { 0x00 }; |
769 | ||
5f3ef64f | 770 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
771 | /* Write a single 0 at the last position of the file; |
772 | * this triggers code that will fill in 0's throughout | |
773 | * the intermediate portion of the previous end of the | |
774 | * file and the new and of the file */ | |
48c1e44a | 775 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
776 | (ia->ia_size - 1), 1); |
777 | } else { /* ia->ia_size < i_size_read(inode) */ | |
778 | /* We're chopping off all the pages down to the page | |
779 | * in which ia->ia_size is located. Fill in the end of | |
780 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to | |
2ed92554 MH |
781 | * PAGE_CACHE_SIZE with zeros. */ |
782 | size_t num_zeros = (PAGE_CACHE_SIZE | |
5f3ef64f | 783 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
2ed92554 | 784 | |
2c27c65e CH |
785 | |
786 | /* | |
787 | * XXX(truncate) this should really happen at the begginning | |
788 | * of ->setattr. But the code is too messy to that as part | |
789 | * of a larger patch. ecryptfs is also totally missing out | |
790 | * on the inode_change_ok check at the beginning of | |
791 | * ->setattr while would include this. | |
792 | */ | |
793 | rc = inode_newsize_ok(inode, ia->ia_size); | |
794 | if (rc) | |
795 | goto out; | |
796 | ||
13a791b4 | 797 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 798 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
799 | lower_ia->ia_size = ia->ia_size; |
800 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 801 | goto out; |
13a791b4 | 802 | } |
2ed92554 MH |
803 | if (num_zeros) { |
804 | char *zeros_virt; | |
805 | ||
806 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
807 | if (!zeros_virt) { | |
808 | rc = -ENOMEM; | |
48c1e44a | 809 | goto out; |
2ed92554 | 810 | } |
48c1e44a | 811 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 812 | ia->ia_size, num_zeros); |
2ed92554 | 813 | kfree(zeros_virt); |
5dda6992 | 814 | if (rc) { |
240e2df5 MH |
815 | printk(KERN_ERR "Error attempting to zero out " |
816 | "the remainder of the end page on " | |
817 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 818 | goto out; |
240e2df5 MH |
819 | } |
820 | } | |
2c27c65e | 821 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 822 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
823 | if (rc) { |
824 | printk(KERN_ERR "Problem with " | |
825 | "ecryptfs_write_inode_size_to_metadata; " | |
826 | "rc = [%d]\n", rc); | |
48c1e44a | 827 | goto out; |
dd2a3b7a | 828 | } |
237fead6 MH |
829 | /* We are reducing the size of the ecryptfs file, and need to |
830 | * know if we need to reduce the size of the lower file. */ | |
831 | lower_size_before_truncate = | |
832 | upper_size_to_lower_size(crypt_stat, i_size); | |
833 | lower_size_after_truncate = | |
5f3ef64f TH |
834 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
835 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
836 | lower_ia->ia_size = lower_size_after_truncate; | |
837 | lower_ia->ia_valid |= ATTR_SIZE; | |
838 | } else | |
839 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 840 | } |
237fead6 MH |
841 | out: |
842 | return rc; | |
843 | } | |
844 | ||
5f3ef64f TH |
845 | /** |
846 | * ecryptfs_truncate | |
847 | * @dentry: The ecryptfs layer dentry | |
848 | * @new_length: The length to expand the file to | |
849 | * | |
850 | * Simple function that handles the truncation of an eCryptfs inode and | |
851 | * its corresponding lower inode. | |
852 | * | |
853 | * Returns zero on success; non-zero otherwise | |
854 | */ | |
855 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
856 | { | |
857 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
858 | struct iattr lower_ia = { .ia_valid = 0 }; | |
859 | int rc; | |
860 | ||
861 | rc = truncate_upper(dentry, &ia, &lower_ia); | |
862 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
863 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
864 | ||
865 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
866 | rc = notify_change(lower_dentry, &lower_ia); | |
867 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
868 | } | |
869 | return rc; | |
870 | } | |
871 | ||
237fead6 | 872 | static int |
b74c79e9 | 873 | ecryptfs_permission(struct inode *inode, int mask, unsigned int flags) |
237fead6 | 874 | { |
b74c79e9 NP |
875 | if (flags & IPERM_FLAG_RCU) |
876 | return -ECHILD; | |
f419a2e3 | 877 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
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; | |
5f3ef64f | 896 | struct iattr lower_ia; |
237fead6 MH |
897 | struct inode *inode; |
898 | struct inode *lower_inode; | |
899 | struct ecryptfs_crypt_stat *crypt_stat; | |
900 | ||
901 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
902 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
903 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
904 | inode = dentry->d_inode; |
905 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
906 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
907 | mutex_lock(&crypt_stat->cs_mutex); | |
908 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
909 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
910 | else if (S_ISREG(dentry->d_inode->i_mode) |
911 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
912 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 913 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 914 | |
e10f281b MH |
915 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
916 | dentry->d_sb)->mount_crypt_stat; | |
d7cdc5fe | 917 | rc = ecryptfs_read_metadata(dentry); |
5dda6992 | 918 | if (rc) { |
e10f281b MH |
919 | if (!(mount_crypt_stat->flags |
920 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
921 | rc = -EIO; | |
25bd8174 | 922 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 923 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
924 | "or the key could not be retrieved. " |
925 | "Plaintext passthrough mode is not " | |
e10f281b | 926 | "enabled; returning -EIO\n"); |
e10f281b | 927 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
928 | goto out; |
929 | } | |
930 | rc = 0; | |
931 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
e10f281b | 932 | } |
e10f281b MH |
933 | } |
934 | mutex_unlock(&crypt_stat->cs_mutex); | |
5f3ef64f TH |
935 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
936 | if (ia->ia_valid & ATTR_FILE) | |
937 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 938 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 939 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
940 | if (rc < 0) |
941 | goto out; | |
942 | } | |
1ac564ec JL |
943 | |
944 | /* | |
945 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
946 | * to interpret this in its own way. | |
947 | */ | |
5f3ef64f TH |
948 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
949 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 950 | |
9c3580aa | 951 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
5f3ef64f | 952 | rc = notify_change(lower_dentry, &lower_ia); |
9c3580aa | 953 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
237fead6 | 954 | out: |
9afa2fb6 | 955 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
956 | return rc; |
957 | } | |
958 | ||
3a60a168 TH |
959 | int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
960 | struct kstat *stat) | |
961 | { | |
962 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; | |
963 | int rc = 0; | |
964 | ||
965 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
966 | dentry->d_sb)->mount_crypt_stat; | |
967 | generic_fillattr(dentry->d_inode, stat); | |
968 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { | |
969 | char *target; | |
970 | size_t targetsiz; | |
971 | ||
972 | rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); | |
973 | if (!rc) { | |
974 | kfree(target); | |
975 | stat->size = targetsiz; | |
976 | } | |
977 | } | |
978 | return rc; | |
979 | } | |
980 | ||
f8f484d1 TH |
981 | int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
982 | struct kstat *stat) | |
983 | { | |
984 | struct kstat lower_stat; | |
985 | int rc; | |
986 | ||
987 | rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), | |
988 | ecryptfs_dentry_to_lower(dentry), &lower_stat); | |
989 | if (!rc) { | |
55f9cf6b TH |
990 | fsstack_copy_attr_all(dentry->d_inode, |
991 | ecryptfs_inode_to_lower(dentry->d_inode)); | |
f8f484d1 TH |
992 | generic_fillattr(dentry->d_inode, stat); |
993 | stat->blocks = lower_stat.blocks; | |
994 | } | |
995 | return rc; | |
996 | } | |
997 | ||
dd2a3b7a | 998 | int |
237fead6 MH |
999 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
1000 | size_t size, int flags) | |
1001 | { | |
1002 | int rc = 0; | |
1003 | struct dentry *lower_dentry; | |
1004 | ||
1005 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1006 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
cfce08c6 | 1007 | rc = -EOPNOTSUPP; |
237fead6 MH |
1008 | goto out; |
1009 | } | |
48b512e6 RS |
1010 | |
1011 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); | |
237fead6 MH |
1012 | out: |
1013 | return rc; | |
1014 | } | |
1015 | ||
d7cdc5fe MH |
1016 | ssize_t |
1017 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
1018 | void *value, size_t size) | |
1019 | { | |
1020 | int rc = 0; | |
1021 | ||
1022 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
cfce08c6 | 1023 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1024 | goto out; |
1025 | } | |
1026 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1027 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
1028 | size); | |
1029 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1030 | out: | |
1031 | return rc; | |
1032 | } | |
1033 | ||
7896b631 | 1034 | static ssize_t |
237fead6 MH |
1035 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
1036 | size_t size) | |
1037 | { | |
2ed92554 MH |
1038 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
1039 | value, size); | |
237fead6 MH |
1040 | } |
1041 | ||
1042 | static ssize_t | |
1043 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1044 | { | |
1045 | int rc = 0; | |
1046 | struct dentry *lower_dentry; | |
1047 | ||
1048 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1049 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
cfce08c6 | 1050 | rc = -EOPNOTSUPP; |
237fead6 MH |
1051 | goto out; |
1052 | } | |
1053 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1054 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
1055 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1056 | out: | |
1057 | return rc; | |
1058 | } | |
1059 | ||
1060 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
1061 | { | |
1062 | int rc = 0; | |
1063 | struct dentry *lower_dentry; | |
1064 | ||
1065 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1066 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
cfce08c6 | 1067 | rc = -EOPNOTSUPP; |
237fead6 MH |
1068 | goto out; |
1069 | } | |
1070 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1071 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
1072 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1073 | out: | |
1074 | return rc; | |
1075 | } | |
1076 | ||
1077 | int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) | |
1078 | { | |
1079 | if ((ecryptfs_inode_to_lower(inode) | |
1080 | == (struct inode *)candidate_lower_inode)) | |
1081 | return 1; | |
1082 | else | |
1083 | return 0; | |
1084 | } | |
1085 | ||
1086 | int ecryptfs_inode_set(struct inode *inode, void *lower_inode) | |
1087 | { | |
1088 | ecryptfs_init_inode(inode, (struct inode *)lower_inode); | |
1089 | return 0; | |
1090 | } | |
1091 | ||
754661f1 | 1092 | const struct inode_operations ecryptfs_symlink_iops = { |
237fead6 MH |
1093 | .readlink = ecryptfs_readlink, |
1094 | .follow_link = ecryptfs_follow_link, | |
1095 | .put_link = ecryptfs_put_link, | |
1096 | .permission = ecryptfs_permission, | |
1097 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1098 | .getattr = ecryptfs_getattr_link, |
237fead6 MH |
1099 | .setxattr = ecryptfs_setxattr, |
1100 | .getxattr = ecryptfs_getxattr, | |
1101 | .listxattr = ecryptfs_listxattr, | |
1102 | .removexattr = ecryptfs_removexattr | |
1103 | }; | |
1104 | ||
754661f1 | 1105 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1106 | .create = ecryptfs_create, |
1107 | .lookup = ecryptfs_lookup, | |
1108 | .link = ecryptfs_link, | |
1109 | .unlink = ecryptfs_unlink, | |
1110 | .symlink = ecryptfs_symlink, | |
1111 | .mkdir = ecryptfs_mkdir, | |
1112 | .rmdir = ecryptfs_rmdir, | |
1113 | .mknod = ecryptfs_mknod, | |
1114 | .rename = ecryptfs_rename, | |
1115 | .permission = ecryptfs_permission, | |
1116 | .setattr = ecryptfs_setattr, | |
1117 | .setxattr = ecryptfs_setxattr, | |
1118 | .getxattr = ecryptfs_getxattr, | |
1119 | .listxattr = ecryptfs_listxattr, | |
1120 | .removexattr = ecryptfs_removexattr | |
1121 | }; | |
1122 | ||
754661f1 | 1123 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1124 | .permission = ecryptfs_permission, |
1125 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1126 | .getattr = ecryptfs_getattr, |
237fead6 MH |
1127 | .setxattr = ecryptfs_setxattr, |
1128 | .getxattr = ecryptfs_getxattr, | |
1129 | .listxattr = ecryptfs_listxattr, | |
1130 | .removexattr = ecryptfs_removexattr | |
1131 | }; |