Commit | Line | Data |
---|---|---|
237fead6 MH |
1 | /** |
2 | * eCryptfs: Linux filesystem encryption layer | |
3 | * | |
4 | * Copyright (C) 1997-2004 Erez Zadok | |
5 | * Copyright (C) 2001-2004 Stony Brook University | |
dd2a3b7a | 6 | * Copyright (C) 2004-2007 International Business Machines Corp. |
237fead6 MH |
7 | * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> |
8 | * Michael C. Thompsion <mcthomps@us.ibm.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License as | |
12 | * published by the Free Software Foundation; either version 2 of the | |
13 | * License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
23 | * 02111-1307, USA. | |
24 | */ | |
25 | ||
26 | #include <linux/file.h> | |
27 | #include <linux/vmalloc.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/dcache.h> | |
30 | #include <linux/namei.h> | |
31 | #include <linux/mount.h> | |
32 | #include <linux/crypto.h> | |
0cc72dc7 | 33 | #include <linux/fs_stack.h> |
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 | } |
237fead6 MH |
164 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
165 | rc = ecryptfs_new_file_context(ecryptfs_dentry); | |
166 | if (rc) { | |
d7cdc5fe MH |
167 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
168 | "context; rc = [%d]\n", rc); | |
169 | goto out; | |
237fead6 | 170 | } |
332ab16f | 171 | rc = ecryptfs_get_lower_file(ecryptfs_dentry); |
27992890 RS |
172 | if (rc) { |
173 | printk(KERN_ERR "%s: Error attempting to initialize " | |
332ab16f | 174 | "the lower file for the dentry with name " |
27992890 RS |
175 | "[%s]; rc = [%d]\n", __func__, |
176 | ecryptfs_dentry->d_name.name, rc); | |
177 | goto out; | |
391b52f9 | 178 | } |
d7cdc5fe | 179 | rc = ecryptfs_write_metadata(ecryptfs_dentry); |
332ab16f | 180 | if (rc) |
d7cdc5fe | 181 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
332ab16f | 182 | ecryptfs_put_lower_file(ecryptfs_dentry->d_inode); |
237fead6 MH |
183 | out: |
184 | return rc; | |
185 | } | |
186 | ||
187 | /** | |
188 | * ecryptfs_create | |
189 | * @dir: The inode of the directory in which to create the file. | |
190 | * @dentry: The eCryptfs dentry | |
191 | * @mode: The mode of the new file. | |
192 | * @nd: nameidata | |
193 | * | |
194 | * Creates a new file. | |
195 | * | |
196 | * Returns zero on success; non-zero on error condition | |
197 | */ | |
198 | static int | |
199 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
200 | int mode, struct nameidata *nd) | |
201 | { | |
202 | int rc; | |
203 | ||
addd65ad | 204 | /* ecryptfs_do_create() calls ecryptfs_interpose() */ |
237fead6 MH |
205 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); |
206 | if (unlikely(rc)) { | |
207 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" | |
208 | "lower filesystem\n"); | |
209 | goto out; | |
210 | } | |
211 | /* At this point, a file exists on "disk"; we need to make sure | |
212 | * that this on disk file is prepared to be an ecryptfs file */ | |
213 | rc = ecryptfs_initialize_file(ecryptfs_dentry); | |
214 | out: | |
215 | return rc; | |
216 | } | |
217 | ||
218 | /** | |
addd65ad | 219 | * ecryptfs_lookup_and_interpose_lower - Perform a lookup |
237fead6 | 220 | */ |
addd65ad MH |
221 | int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, |
222 | struct dentry *lower_dentry, | |
70b89021 | 223 | struct inode *ecryptfs_dir_inode) |
237fead6 | 224 | { |
237fead6 | 225 | struct dentry *lower_dir_dentry; |
237fead6 | 226 | struct vfsmount *lower_mnt; |
addd65ad | 227 | struct inode *lower_inode; |
2aac0cf8 | 228 | struct ecryptfs_crypt_stat *crypt_stat; |
237fead6 | 229 | char *page_virt = NULL; |
332ab16f | 230 | int put_lower = 0, rc = 0; |
237fead6 | 231 | |
addd65ad MH |
232 | lower_dir_dentry = lower_dentry->d_parent; |
233 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( | |
234 | ecryptfs_dentry->d_parent)); | |
237fead6 | 235 | lower_inode = lower_dentry->d_inode; |
addd65ad | 236 | fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); |
b7ab39f6 | 237 | BUG_ON(!lower_dentry->d_count); |
addd65ad | 238 | ecryptfs_set_dentry_private(ecryptfs_dentry, |
237fead6 | 239 | kmem_cache_alloc(ecryptfs_dentry_info_cache, |
e94b1766 | 240 | GFP_KERNEL)); |
addd65ad | 241 | if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { |
237fead6 | 242 | rc = -ENOMEM; |
addd65ad MH |
243 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
244 | "to allocate ecryptfs_dentry_info struct\n", | |
245 | __func__); | |
31f73bee | 246 | goto out_put; |
237fead6 | 247 | } |
addd65ad MH |
248 | ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); |
249 | ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); | |
237fead6 MH |
250 | if (!lower_dentry->d_inode) { |
251 | /* We want to add because we couldn't find in lower */ | |
addd65ad | 252 | d_add(ecryptfs_dentry, NULL); |
237fead6 MH |
253 | goto out; |
254 | } | |
addd65ad | 255 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, |
3469b573 EZ |
256 | ecryptfs_dir_inode->i_sb, |
257 | ECRYPTFS_INTERPOSE_FLAG_D_ADD); | |
237fead6 | 258 | if (rc) { |
addd65ad MH |
259 | printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", |
260 | __func__, rc); | |
391b52f9 | 261 | goto out; |
237fead6 | 262 | } |
addd65ad | 263 | if (S_ISDIR(lower_inode->i_mode)) |
237fead6 | 264 | goto out; |
addd65ad | 265 | if (S_ISLNK(lower_inode->i_mode)) |
237fead6 | 266 | goto out; |
addd65ad | 267 | if (special_file(lower_inode->i_mode)) |
202a21d6 | 268 | goto out; |
237fead6 | 269 | /* Released in this function */ |
addd65ad | 270 | page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); |
237fead6 | 271 | if (!page_virt) { |
addd65ad MH |
272 | printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", |
273 | __func__); | |
237fead6 | 274 | rc = -ENOMEM; |
391b52f9 | 275 | goto out; |
237fead6 | 276 | } |
332ab16f | 277 | rc = ecryptfs_get_lower_file(ecryptfs_dentry); |
27992890 RS |
278 | if (rc) { |
279 | printk(KERN_ERR "%s: Error attempting to initialize " | |
332ab16f | 280 | "the lower file for the dentry with name " |
27992890 RS |
281 | "[%s]; rc = [%d]\n", __func__, |
282 | ecryptfs_dentry->d_name.name, rc); | |
283 | goto out_free_kmem; | |
391b52f9 | 284 | } |
332ab16f | 285 | put_lower = 1; |
2aac0cf8 TH |
286 | crypt_stat = &ecryptfs_inode_to_private( |
287 | ecryptfs_dentry->d_inode)->crypt_stat; | |
288 | /* TODO: lock for crypt_stat comparison */ | |
289 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
290 | ecryptfs_set_default_sizes(crypt_stat); | |
d7cdc5fe | 291 | rc = ecryptfs_read_and_validate_header_region(page_virt, |
addd65ad | 292 | ecryptfs_dentry->d_inode); |
237fead6 | 293 | if (rc) { |
1984c23f | 294 | memset(page_virt, 0, PAGE_CACHE_SIZE); |
addd65ad MH |
295 | rc = ecryptfs_read_and_validate_xattr_region(page_virt, |
296 | ecryptfs_dentry); | |
dd2a3b7a | 297 | if (rc) { |
dd2a3b7a | 298 | rc = 0; |
addd65ad | 299 | goto out_free_kmem; |
237fead6 | 300 | } |
dd2a3b7a | 301 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
237fead6 | 302 | } |
3aeb86ea | 303 | ecryptfs_i_size_init(page_virt, ecryptfs_dentry->d_inode); |
addd65ad | 304 | out_free_kmem: |
237fead6 MH |
305 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
306 | goto out; | |
31f73bee | 307 | out_put: |
237fead6 | 308 | dput(lower_dentry); |
31f73bee | 309 | mntput(lower_mnt); |
addd65ad MH |
310 | d_drop(ecryptfs_dentry); |
311 | out: | |
332ab16f TH |
312 | if (put_lower) |
313 | ecryptfs_put_lower_file(ecryptfs_dentry->d_inode); | |
addd65ad MH |
314 | return rc; |
315 | } | |
316 | ||
317 | /** | |
318 | * ecryptfs_lookup | |
319 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
320 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
321 | * @ecryptfs_nd: nameidata; may be NULL | |
322 | * | |
323 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
324 | * dentry cache and continue on to read it from the disk. | |
325 | */ | |
326 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
327 | struct dentry *ecryptfs_dentry, | |
328 | struct nameidata *ecryptfs_nd) | |
329 | { | |
330 | char *encrypted_and_encoded_name = NULL; | |
a8f12864 | 331 | size_t encrypted_and_encoded_name_size; |
addd65ad | 332 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
addd65ad MH |
333 | struct dentry *lower_dir_dentry, *lower_dentry; |
334 | int rc = 0; | |
335 | ||
addd65ad MH |
336 | if ((ecryptfs_dentry->d_name.len == 1 |
337 | && !strcmp(ecryptfs_dentry->d_name.name, ".")) | |
338 | || (ecryptfs_dentry->d_name.len == 2 | |
339 | && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { | |
340 | goto out_d_drop; | |
341 | } | |
342 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); | |
8787c7a3 TH |
343 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
344 | lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, | |
345 | lower_dir_dentry, | |
346 | ecryptfs_dentry->d_name.len); | |
347 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
348 | if (IS_ERR(lower_dentry)) { |
349 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 350 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
351 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
352 | encrypted_and_encoded_name); | |
addd65ad MH |
353 | goto out_d_drop; |
354 | } | |
355 | if (lower_dentry->d_inode) | |
356 | goto lookup_and_interpose; | |
2aac0cf8 TH |
357 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
358 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
359 | if (!(mount_crypt_stat | |
360 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) | |
addd65ad MH |
361 | goto lookup_and_interpose; |
362 | dput(lower_dentry); | |
363 | rc = ecryptfs_encrypt_and_encode_filename( | |
364 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, | |
2aac0cf8 | 365 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
addd65ad MH |
366 | ecryptfs_dentry->d_name.len); |
367 | if (rc) { | |
368 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
369 | "filename; rc = [%d]\n", __func__, rc); | |
370 | goto out_d_drop; | |
371 | } | |
8787c7a3 TH |
372 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
373 | lower_dentry = lookup_one_len(encrypted_and_encoded_name, | |
374 | lower_dir_dentry, | |
375 | encrypted_and_encoded_name_size); | |
376 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
377 | if (IS_ERR(lower_dentry)) { |
378 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 379 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
380 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
381 | encrypted_and_encoded_name); | |
addd65ad MH |
382 | goto out_d_drop; |
383 | } | |
384 | lookup_and_interpose: | |
385 | rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, | |
70b89021 | 386 | ecryptfs_dir_inode); |
addd65ad MH |
387 | goto out; |
388 | out_d_drop: | |
389 | d_drop(ecryptfs_dentry); | |
237fead6 | 390 | out: |
addd65ad | 391 | kfree(encrypted_and_encoded_name); |
237fead6 MH |
392 | return ERR_PTR(rc); |
393 | } | |
394 | ||
395 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
396 | struct dentry *new_dentry) | |
397 | { | |
398 | struct dentry *lower_old_dentry; | |
399 | struct dentry *lower_new_dentry; | |
400 | struct dentry *lower_dir_dentry; | |
401 | u64 file_size_save; | |
402 | int rc; | |
403 | ||
404 | file_size_save = i_size_read(old_dentry->d_inode); | |
405 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
406 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
407 | dget(lower_old_dentry); | |
408 | dget(lower_new_dentry); | |
409 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
410 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
411 | lower_new_dentry); | |
412 | if (rc || !lower_new_dentry->d_inode) | |
413 | goto out_lock; | |
414 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); | |
415 | if (rc) | |
416 | goto out_lock; | |
3a8380c0 TH |
417 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
418 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
419 | old_dentry->d_inode->i_nlink = |
420 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; | |
421 | i_size_write(new_dentry->d_inode, file_size_save); | |
422 | out_lock: | |
423 | unlock_dir(lower_dir_dentry); | |
424 | dput(lower_new_dentry); | |
425 | dput(lower_old_dentry); | |
237fead6 MH |
426 | return rc; |
427 | } | |
428 | ||
429 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
430 | { | |
431 | int rc = 0; | |
432 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
433 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
8dc4e373 | 434 | struct dentry *lower_dir_dentry; |
237fead6 | 435 | |
9c2d2056 | 436 | dget(lower_dentry); |
8dc4e373 | 437 | lower_dir_dentry = lock_parent(lower_dentry); |
237fead6 MH |
438 | rc = vfs_unlink(lower_dir_inode, lower_dentry); |
439 | if (rc) { | |
ae56fb16 | 440 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
441 | goto out_unlock; |
442 | } | |
0cc72dc7 | 443 | fsstack_copy_attr_times(dir, lower_dir_inode); |
237fead6 MH |
444 | dentry->d_inode->i_nlink = |
445 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; | |
446 | dentry->d_inode->i_ctime = dir->i_ctime; | |
caeeeecf | 447 | d_drop(dentry); |
237fead6 | 448 | out_unlock: |
8dc4e373 | 449 | unlock_dir(lower_dir_dentry); |
9c2d2056 | 450 | dput(lower_dentry); |
237fead6 MH |
451 | return rc; |
452 | } | |
453 | ||
454 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
455 | const char *symname) | |
456 | { | |
457 | int rc; | |
458 | struct dentry *lower_dentry; | |
459 | struct dentry *lower_dir_dentry; | |
237fead6 | 460 | char *encoded_symname; |
addd65ad MH |
461 | size_t encoded_symlen; |
462 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
463 | |
464 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
465 | dget(lower_dentry); | |
466 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
467 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
468 | dir->i_sb)->mount_crypt_stat; | |
469 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
470 | &encoded_symlen, | |
471 | NULL, | |
472 | mount_crypt_stat, symname, | |
473 | strlen(symname)); | |
474 | if (rc) | |
237fead6 | 475 | goto out_lock; |
237fead6 | 476 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, |
db2e747b | 477 | encoded_symname); |
237fead6 MH |
478 | kfree(encoded_symname); |
479 | if (rc || !lower_dentry->d_inode) | |
480 | goto out_lock; | |
481 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
482 | if (rc) | |
483 | goto out_lock; | |
0cc72dc7 JJS |
484 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
485 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
486 | out_lock: |
487 | unlock_dir(lower_dir_dentry); | |
488 | dput(lower_dentry); | |
489 | if (!dentry->d_inode) | |
490 | d_drop(dentry); | |
491 | return rc; | |
492 | } | |
493 | ||
494 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
495 | { | |
496 | int rc; | |
497 | struct dentry *lower_dentry; | |
498 | struct dentry *lower_dir_dentry; | |
499 | ||
500 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
501 | lower_dir_dentry = lock_parent(lower_dentry); | |
502 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
503 | if (rc || !lower_dentry->d_inode) | |
504 | goto out; | |
505 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
506 | if (rc) | |
507 | goto out; | |
0cc72dc7 JJS |
508 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
509 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
510 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
511 | out: | |
512 | unlock_dir(lower_dir_dentry); | |
513 | if (!dentry->d_inode) | |
514 | d_drop(dentry); | |
515 | return rc; | |
516 | } | |
517 | ||
518 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
519 | { | |
237fead6 | 520 | struct dentry *lower_dentry; |
237fead6 | 521 | struct dentry *lower_dir_dentry; |
45ec4aba | 522 | int rc; |
237fead6 | 523 | |
79bf7c73 SW |
524 | dentry_unhash(dentry); |
525 | ||
237fead6 | 526 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
45ec4aba | 527 | dget(dentry); |
237fead6 | 528 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 529 | dget(lower_dentry); |
237fead6 | 530 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba | 531 | dput(lower_dentry); |
0cc72dc7 | 532 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
533 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
534 | unlock_dir(lower_dir_dentry); | |
535 | if (!rc) | |
536 | d_drop(dentry); | |
45ec4aba | 537 | dput(dentry); |
237fead6 MH |
538 | return rc; |
539 | } | |
540 | ||
541 | static int | |
542 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
543 | { | |
544 | int rc; | |
545 | struct dentry *lower_dentry; | |
546 | struct dentry *lower_dir_dentry; | |
547 | ||
548 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
549 | lower_dir_dentry = lock_parent(lower_dentry); | |
550 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
551 | if (rc || !lower_dentry->d_inode) | |
552 | goto out; | |
391b52f9 | 553 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); |
237fead6 MH |
554 | if (rc) |
555 | goto out; | |
0cc72dc7 JJS |
556 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
557 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
558 | out: |
559 | unlock_dir(lower_dir_dentry); | |
560 | if (!dentry->d_inode) | |
561 | d_drop(dentry); | |
562 | return rc; | |
563 | } | |
564 | ||
565 | static int | |
566 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
567 | struct inode *new_dir, struct dentry *new_dentry) | |
568 | { | |
569 | int rc; | |
570 | struct dentry *lower_old_dentry; | |
571 | struct dentry *lower_new_dentry; | |
572 | struct dentry *lower_old_dir_dentry; | |
573 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 574 | struct dentry *trap = NULL; |
237fead6 MH |
575 | |
576 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
577 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
578 | dget(lower_old_dentry); | |
579 | dget(lower_new_dentry); | |
580 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
581 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
0d132f73 EZ |
582 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
583 | /* source should not be ancestor of target */ | |
584 | if (trap == lower_old_dentry) { | |
585 | rc = -EINVAL; | |
586 | goto out_lock; | |
587 | } | |
588 | /* target should not be ancestor of source */ | |
589 | if (trap == lower_new_dentry) { | |
590 | rc = -ENOTEMPTY; | |
591 | goto out_lock; | |
592 | } | |
237fead6 MH |
593 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, |
594 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
595 | if (rc) | |
596 | goto out_lock; | |
9afa2fb6 | 597 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); |
237fead6 | 598 | if (new_dir != old_dir) |
9afa2fb6 | 599 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); |
237fead6 MH |
600 | out_lock: |
601 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
dd55c898 TH |
602 | dput(lower_new_dir_dentry); |
603 | dput(lower_old_dir_dentry); | |
237fead6 MH |
604 | dput(lower_new_dentry); |
605 | dput(lower_old_dentry); | |
606 | return rc; | |
607 | } | |
608 | ||
3a60a168 TH |
609 | static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, |
610 | size_t *bufsiz) | |
237fead6 | 611 | { |
3a60a168 | 612 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
237fead6 | 613 | char *lower_buf; |
3a60a168 | 614 | size_t lower_bufsiz = PATH_MAX; |
addd65ad MH |
615 | mm_segment_t old_fs; |
616 | int rc; | |
237fead6 | 617 | |
3a6b42ca | 618 | lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); |
3a60a168 | 619 | if (!lower_buf) { |
237fead6 MH |
620 | rc = -ENOMEM; |
621 | goto out; | |
622 | } | |
623 | old_fs = get_fs(); | |
624 | set_fs(get_ds()); | |
237fead6 MH |
625 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, |
626 | (char __user *)lower_buf, | |
3a6b42ca | 627 | lower_bufsiz); |
237fead6 | 628 | set_fs(old_fs); |
3a60a168 TH |
629 | if (rc < 0) |
630 | goto out; | |
631 | lower_bufsiz = rc; | |
632 | rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, | |
633 | lower_buf, lower_bufsiz); | |
634 | out: | |
237fead6 | 635 | kfree(lower_buf); |
3a60a168 TH |
636 | return rc; |
637 | } | |
638 | ||
639 | static int | |
640 | ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) | |
641 | { | |
642 | char *kbuf; | |
643 | size_t kbufsiz, copied; | |
644 | int rc; | |
645 | ||
646 | rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); | |
647 | if (rc) | |
648 | goto out; | |
649 | copied = min_t(size_t, bufsiz, kbufsiz); | |
650 | rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; | |
651 | kfree(kbuf); | |
652 | fsstack_copy_attr_atime(dentry->d_inode, | |
653 | ecryptfs_dentry_to_lower(dentry)->d_inode); | |
237fead6 MH |
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) { | |
806892e9 | 667 | buf = ERR_PTR(-ENOMEM); |
237fead6 MH |
668 | goto out; |
669 | } | |
670 | old_fs = get_fs(); | |
671 | set_fs(get_ds()); | |
237fead6 | 672 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); |
237fead6 | 673 | set_fs(old_fs); |
806892e9 OH |
674 | if (rc < 0) { |
675 | kfree(buf); | |
676 | buf = ERR_PTR(rc); | |
677 | } else | |
a17d5232 | 678 | buf[rc] = '\0'; |
237fead6 | 679 | out: |
806892e9 OH |
680 | nd_set_link(nd, buf); |
681 | return NULL; | |
237fead6 MH |
682 | } |
683 | ||
684 | static void | |
685 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
686 | { | |
806892e9 OH |
687 | char *buf = nd_get_link(nd); |
688 | if (!IS_ERR(buf)) { | |
689 | /* Free the char* */ | |
690 | kfree(buf); | |
691 | } | |
237fead6 MH |
692 | } |
693 | ||
694 | /** | |
695 | * upper_size_to_lower_size | |
696 | * @crypt_stat: Crypt_stat associated with file | |
697 | * @upper_size: Size of the upper file | |
698 | * | |
cc11beff | 699 | * Calculate the required size of the lower file based on the |
237fead6 MH |
700 | * specified size of the upper file. This calculation is based on the |
701 | * number of headers in the underlying file and the extent size. | |
702 | * | |
703 | * Returns Calculated size of the lower file. | |
704 | */ | |
705 | static loff_t | |
706 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
707 | loff_t upper_size) | |
708 | { | |
709 | loff_t lower_size; | |
710 | ||
157f1071 | 711 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
712 | if (upper_size != 0) { |
713 | loff_t num_extents; | |
714 | ||
715 | num_extents = upper_size >> crypt_stat->extent_shift; | |
716 | if (upper_size & ~crypt_stat->extent_mask) | |
717 | num_extents++; | |
718 | lower_size += (num_extents * crypt_stat->extent_size); | |
719 | } | |
720 | return lower_size; | |
721 | } | |
722 | ||
723 | /** | |
5f3ef64f | 724 | * truncate_upper |
237fead6 | 725 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
726 | * @ia: Address of the ecryptfs inode's attributes |
727 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
728 | * |
729 | * Function to handle truncations modifying the size of the file. Note | |
730 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
731 | * writing strings of 0's out. When truncating, we truncate the upper |
732 | * inode and update the lower_ia according to the page index | |
733 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
734 | * the caller must use lower_ia in a call to notify_change() to perform | |
735 | * the truncation of the lower inode. | |
237fead6 MH |
736 | * |
737 | * Returns zero on success; non-zero otherwise | |
738 | */ | |
5f3ef64f TH |
739 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
740 | struct iattr *lower_ia) | |
237fead6 MH |
741 | { |
742 | int rc = 0; | |
743 | struct inode *inode = dentry->d_inode; | |
237fead6 MH |
744 | struct ecryptfs_crypt_stat *crypt_stat; |
745 | loff_t i_size = i_size_read(inode); | |
746 | loff_t lower_size_before_truncate; | |
747 | loff_t lower_size_after_truncate; | |
748 | ||
5f3ef64f TH |
749 | if (unlikely((ia->ia_size == i_size))) { |
750 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 751 | return 0; |
5f3ef64f | 752 | } |
332ab16f TH |
753 | rc = ecryptfs_get_lower_file(dentry); |
754 | if (rc) | |
755 | return rc; | |
237fead6 | 756 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
237fead6 | 757 | /* Switch on growing or shrinking file */ |
5f3ef64f | 758 | if (ia->ia_size > i_size) { |
2ed92554 MH |
759 | char zero[] = { 0x00 }; |
760 | ||
5f3ef64f | 761 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
762 | /* Write a single 0 at the last position of the file; |
763 | * this triggers code that will fill in 0's throughout | |
764 | * the intermediate portion of the previous end of the | |
765 | * file and the new and of the file */ | |
48c1e44a | 766 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
767 | (ia->ia_size - 1), 1); |
768 | } else { /* ia->ia_size < i_size_read(inode) */ | |
769 | /* We're chopping off all the pages down to the page | |
770 | * in which ia->ia_size is located. Fill in the end of | |
771 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to | |
2ed92554 MH |
772 | * PAGE_CACHE_SIZE with zeros. */ |
773 | size_t num_zeros = (PAGE_CACHE_SIZE | |
5f3ef64f | 774 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
2ed92554 | 775 | |
2c27c65e CH |
776 | |
777 | /* | |
778 | * XXX(truncate) this should really happen at the begginning | |
779 | * of ->setattr. But the code is too messy to that as part | |
780 | * of a larger patch. ecryptfs is also totally missing out | |
781 | * on the inode_change_ok check at the beginning of | |
782 | * ->setattr while would include this. | |
783 | */ | |
784 | rc = inode_newsize_ok(inode, ia->ia_size); | |
785 | if (rc) | |
786 | goto out; | |
787 | ||
13a791b4 | 788 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 789 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
790 | lower_ia->ia_size = ia->ia_size; |
791 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 792 | goto out; |
13a791b4 | 793 | } |
2ed92554 MH |
794 | if (num_zeros) { |
795 | char *zeros_virt; | |
796 | ||
797 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
798 | if (!zeros_virt) { | |
799 | rc = -ENOMEM; | |
48c1e44a | 800 | goto out; |
2ed92554 | 801 | } |
48c1e44a | 802 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 803 | ia->ia_size, num_zeros); |
2ed92554 | 804 | kfree(zeros_virt); |
5dda6992 | 805 | if (rc) { |
240e2df5 MH |
806 | printk(KERN_ERR "Error attempting to zero out " |
807 | "the remainder of the end page on " | |
808 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 809 | goto out; |
240e2df5 MH |
810 | } |
811 | } | |
2c27c65e | 812 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 813 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
814 | if (rc) { |
815 | printk(KERN_ERR "Problem with " | |
816 | "ecryptfs_write_inode_size_to_metadata; " | |
817 | "rc = [%d]\n", rc); | |
48c1e44a | 818 | goto out; |
dd2a3b7a | 819 | } |
237fead6 MH |
820 | /* We are reducing the size of the ecryptfs file, and need to |
821 | * know if we need to reduce the size of the lower file. */ | |
822 | lower_size_before_truncate = | |
823 | upper_size_to_lower_size(crypt_stat, i_size); | |
824 | lower_size_after_truncate = | |
5f3ef64f TH |
825 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
826 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
827 | lower_ia->ia_size = lower_size_after_truncate; | |
828 | lower_ia->ia_valid |= ATTR_SIZE; | |
829 | } else | |
830 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 831 | } |
237fead6 | 832 | out: |
332ab16f | 833 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
834 | return rc; |
835 | } | |
836 | ||
5f3ef64f TH |
837 | /** |
838 | * ecryptfs_truncate | |
839 | * @dentry: The ecryptfs layer dentry | |
840 | * @new_length: The length to expand the file to | |
841 | * | |
842 | * Simple function that handles the truncation of an eCryptfs inode and | |
843 | * its corresponding lower inode. | |
844 | * | |
845 | * Returns zero on success; non-zero otherwise | |
846 | */ | |
847 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
848 | { | |
849 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
850 | struct iattr lower_ia = { .ia_valid = 0 }; | |
851 | int rc; | |
852 | ||
853 | rc = truncate_upper(dentry, &ia, &lower_ia); | |
854 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
855 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
856 | ||
857 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
858 | rc = notify_change(lower_dentry, &lower_ia); | |
859 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
860 | } | |
861 | return rc; | |
862 | } | |
863 | ||
237fead6 | 864 | static int |
b74c79e9 | 865 | ecryptfs_permission(struct inode *inode, int mask, unsigned int flags) |
237fead6 | 866 | { |
b74c79e9 NP |
867 | if (flags & IPERM_FLAG_RCU) |
868 | return -ECHILD; | |
f419a2e3 | 869 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
870 | } |
871 | ||
872 | /** | |
873 | * ecryptfs_setattr | |
874 | * @dentry: dentry handle to the inode to modify | |
875 | * @ia: Structure with flags of what to change and values | |
876 | * | |
877 | * Updates the metadata of an inode. If the update is to the size | |
878 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
879 | * of both the ecryptfs inode and the lower inode. | |
880 | * | |
881 | * All other metadata changes will be passed right to the lower filesystem, | |
882 | * and we will just update our inode to look like the lower. | |
883 | */ | |
884 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
885 | { | |
886 | int rc = 0; | |
887 | struct dentry *lower_dentry; | |
5f3ef64f | 888 | struct iattr lower_ia; |
237fead6 MH |
889 | struct inode *inode; |
890 | struct inode *lower_inode; | |
891 | struct ecryptfs_crypt_stat *crypt_stat; | |
892 | ||
893 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
894 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
895 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
896 | inode = dentry->d_inode; |
897 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
898 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
899 | mutex_lock(&crypt_stat->cs_mutex); | |
900 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
901 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
902 | else if (S_ISREG(dentry->d_inode->i_mode) |
903 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
904 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 905 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 906 | |
e10f281b MH |
907 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
908 | dentry->d_sb)->mount_crypt_stat; | |
332ab16f TH |
909 | rc = ecryptfs_get_lower_file(dentry); |
910 | if (rc) { | |
911 | mutex_unlock(&crypt_stat->cs_mutex); | |
912 | goto out; | |
913 | } | |
d7cdc5fe | 914 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 915 | ecryptfs_put_lower_file(inode); |
5dda6992 | 916 | if (rc) { |
e10f281b MH |
917 | if (!(mount_crypt_stat->flags |
918 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
919 | rc = -EIO; | |
25bd8174 | 920 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 921 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
922 | "or the key could not be retrieved. " |
923 | "Plaintext passthrough mode is not " | |
e10f281b | 924 | "enabled; returning -EIO\n"); |
e10f281b | 925 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
926 | goto out; |
927 | } | |
928 | rc = 0; | |
3aeb86ea TH |
929 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
930 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 931 | } |
e10f281b MH |
932 | } |
933 | mutex_unlock(&crypt_stat->cs_mutex); | |
5be79de2 TH |
934 | if (S_ISREG(inode->i_mode)) { |
935 | rc = filemap_write_and_wait(inode->i_mapping); | |
936 | if (rc) | |
937 | goto out; | |
938 | fsstack_copy_attr_all(inode, lower_inode); | |
939 | } | |
5f3ef64f TH |
940 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
941 | if (ia->ia_valid & ATTR_FILE) | |
942 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 943 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 944 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
945 | if (rc < 0) |
946 | goto out; | |
947 | } | |
1ac564ec JL |
948 | |
949 | /* | |
950 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
951 | * to interpret this in its own way. | |
952 | */ | |
5f3ef64f TH |
953 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
954 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 955 | |
9c3580aa | 956 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
5f3ef64f | 957 | rc = notify_change(lower_dentry, &lower_ia); |
9c3580aa | 958 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
237fead6 | 959 | out: |
9afa2fb6 | 960 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
961 | return rc; |
962 | } | |
963 | ||
3a60a168 TH |
964 | int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
965 | struct kstat *stat) | |
966 | { | |
967 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; | |
968 | int rc = 0; | |
969 | ||
970 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
971 | dentry->d_sb)->mount_crypt_stat; | |
972 | generic_fillattr(dentry->d_inode, stat); | |
973 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { | |
974 | char *target; | |
975 | size_t targetsiz; | |
976 | ||
977 | rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); | |
978 | if (!rc) { | |
979 | kfree(target); | |
980 | stat->size = targetsiz; | |
981 | } | |
982 | } | |
983 | return rc; | |
984 | } | |
985 | ||
f8f484d1 TH |
986 | int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
987 | struct kstat *stat) | |
988 | { | |
989 | struct kstat lower_stat; | |
990 | int rc; | |
991 | ||
992 | rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), | |
993 | ecryptfs_dentry_to_lower(dentry), &lower_stat); | |
994 | if (!rc) { | |
55f9cf6b TH |
995 | fsstack_copy_attr_all(dentry->d_inode, |
996 | ecryptfs_inode_to_lower(dentry->d_inode)); | |
f8f484d1 TH |
997 | generic_fillattr(dentry->d_inode, stat); |
998 | stat->blocks = lower_stat.blocks; | |
999 | } | |
1000 | return rc; | |
1001 | } | |
1002 | ||
dd2a3b7a | 1003 | int |
237fead6 MH |
1004 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
1005 | size_t size, int flags) | |
1006 | { | |
1007 | int rc = 0; | |
1008 | struct dentry *lower_dentry; | |
1009 | ||
1010 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1011 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
cfce08c6 | 1012 | rc = -EOPNOTSUPP; |
237fead6 MH |
1013 | goto out; |
1014 | } | |
48b512e6 RS |
1015 | |
1016 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); | |
237fead6 MH |
1017 | out: |
1018 | return rc; | |
1019 | } | |
1020 | ||
d7cdc5fe MH |
1021 | ssize_t |
1022 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
1023 | void *value, size_t size) | |
1024 | { | |
1025 | int rc = 0; | |
1026 | ||
1027 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
cfce08c6 | 1028 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1029 | goto out; |
1030 | } | |
1031 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1032 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
1033 | size); | |
1034 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1035 | out: | |
1036 | return rc; | |
1037 | } | |
1038 | ||
7896b631 | 1039 | static ssize_t |
237fead6 MH |
1040 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
1041 | size_t size) | |
1042 | { | |
2ed92554 MH |
1043 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
1044 | value, size); | |
237fead6 MH |
1045 | } |
1046 | ||
1047 | static ssize_t | |
1048 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1049 | { | |
1050 | int rc = 0; | |
1051 | struct dentry *lower_dentry; | |
1052 | ||
1053 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1054 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
cfce08c6 | 1055 | rc = -EOPNOTSUPP; |
237fead6 MH |
1056 | goto out; |
1057 | } | |
1058 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1059 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
1060 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1061 | out: | |
1062 | return rc; | |
1063 | } | |
1064 | ||
1065 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
1066 | { | |
1067 | int rc = 0; | |
1068 | struct dentry *lower_dentry; | |
1069 | ||
1070 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1071 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
cfce08c6 | 1072 | rc = -EOPNOTSUPP; |
237fead6 MH |
1073 | goto out; |
1074 | } | |
1075 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1076 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
1077 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1078 | out: | |
1079 | return rc; | |
1080 | } | |
1081 | ||
1082 | int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) | |
1083 | { | |
1084 | if ((ecryptfs_inode_to_lower(inode) | |
1085 | == (struct inode *)candidate_lower_inode)) | |
1086 | return 1; | |
1087 | else | |
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | int ecryptfs_inode_set(struct inode *inode, void *lower_inode) | |
1092 | { | |
1093 | ecryptfs_init_inode(inode, (struct inode *)lower_inode); | |
1094 | return 0; | |
1095 | } | |
1096 | ||
754661f1 | 1097 | const struct inode_operations ecryptfs_symlink_iops = { |
237fead6 MH |
1098 | .readlink = ecryptfs_readlink, |
1099 | .follow_link = ecryptfs_follow_link, | |
1100 | .put_link = ecryptfs_put_link, | |
1101 | .permission = ecryptfs_permission, | |
1102 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1103 | .getattr = ecryptfs_getattr_link, |
237fead6 MH |
1104 | .setxattr = ecryptfs_setxattr, |
1105 | .getxattr = ecryptfs_getxattr, | |
1106 | .listxattr = ecryptfs_listxattr, | |
1107 | .removexattr = ecryptfs_removexattr | |
1108 | }; | |
1109 | ||
754661f1 | 1110 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1111 | .create = ecryptfs_create, |
1112 | .lookup = ecryptfs_lookup, | |
1113 | .link = ecryptfs_link, | |
1114 | .unlink = ecryptfs_unlink, | |
1115 | .symlink = ecryptfs_symlink, | |
1116 | .mkdir = ecryptfs_mkdir, | |
1117 | .rmdir = ecryptfs_rmdir, | |
1118 | .mknod = ecryptfs_mknod, | |
1119 | .rename = ecryptfs_rename, | |
1120 | .permission = ecryptfs_permission, | |
1121 | .setattr = ecryptfs_setattr, | |
1122 | .setxattr = ecryptfs_setxattr, | |
1123 | .getxattr = ecryptfs_getxattr, | |
1124 | .listxattr = ecryptfs_listxattr, | |
1125 | .removexattr = ecryptfs_removexattr | |
1126 | }; | |
1127 | ||
754661f1 | 1128 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1129 | .permission = ecryptfs_permission, |
1130 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1131 | .getattr = ecryptfs_getattr, |
237fead6 MH |
1132 | .setxattr = ecryptfs_setxattr, |
1133 | .getxattr = ecryptfs_getxattr, | |
1134 | .listxattr = ecryptfs_listxattr, | |
1135 | .removexattr = ecryptfs_removexattr | |
1136 | }; |