]>
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); |
2b0143b5 | 44 | mutex_lock_nested(&(d_inode(dir)->i_mutex), I_MUTEX_PARENT); |
237fead6 MH |
45 | return dir; |
46 | } | |
47 | ||
237fead6 MH |
48 | static void unlock_dir(struct dentry *dir) |
49 | { | |
2b0143b5 | 50 | mutex_unlock(&d_inode(dir)->i_mutex); |
237fead6 MH |
51 | dput(dir); |
52 | } | |
53 | ||
c4f79073 TH |
54 | static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) |
55 | { | |
c4cf3ba4 | 56 | return ecryptfs_inode_to_lower(inode) == lower_inode; |
c4f79073 TH |
57 | } |
58 | ||
5ccf9203 | 59 | static int ecryptfs_inode_set(struct inode *inode, void *opaque) |
c4f79073 | 60 | { |
5ccf9203 TH |
61 | struct inode *lower_inode = opaque; |
62 | ||
63 | ecryptfs_set_inode_lower(inode, lower_inode); | |
64 | fsstack_copy_attr_all(inode, lower_inode); | |
65 | /* i_size will be overwritten for encrypted regular files */ | |
66 | fsstack_copy_inode_size(inode, lower_inode); | |
67 | inode->i_ino = lower_inode->i_ino; | |
c4f79073 | 68 | inode->i_version++; |
c4f79073 | 69 | inode->i_mapping->a_ops = &ecryptfs_aops; |
5ccf9203 TH |
70 | |
71 | if (S_ISLNK(inode->i_mode)) | |
72 | inode->i_op = &ecryptfs_symlink_iops; | |
73 | else if (S_ISDIR(inode->i_mode)) | |
74 | inode->i_op = &ecryptfs_dir_iops; | |
75 | else | |
76 | inode->i_op = &ecryptfs_main_iops; | |
77 | ||
78 | if (S_ISDIR(inode->i_mode)) | |
79 | inode->i_fop = &ecryptfs_dir_fops; | |
80 | else if (special_file(inode->i_mode)) | |
81 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
82 | else | |
83 | inode->i_fop = &ecryptfs_main_fops; | |
84 | ||
c4f79073 TH |
85 | return 0; |
86 | } | |
87 | ||
5ccf9203 TH |
88 | static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, |
89 | struct super_block *sb) | |
c4f79073 TH |
90 | { |
91 | struct inode *inode; | |
c4f79073 | 92 | |
5ccf9203 TH |
93 | if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) |
94 | return ERR_PTR(-EXDEV); | |
95 | if (!igrab(lower_inode)) | |
96 | return ERR_PTR(-ESTALE); | |
c4f79073 TH |
97 | inode = iget5_locked(sb, (unsigned long)lower_inode, |
98 | ecryptfs_inode_test, ecryptfs_inode_set, | |
99 | lower_inode); | |
100 | if (!inode) { | |
c4f79073 | 101 | iput(lower_inode); |
5ccf9203 | 102 | return ERR_PTR(-EACCES); |
c4f79073 | 103 | } |
5ccf9203 | 104 | if (!(inode->i_state & I_NEW)) |
c4f79073 | 105 | iput(lower_inode); |
5ccf9203 TH |
106 | |
107 | return inode; | |
108 | } | |
109 | ||
110 | struct inode *ecryptfs_get_inode(struct inode *lower_inode, | |
111 | struct super_block *sb) | |
112 | { | |
113 | struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); | |
114 | ||
115 | if (!IS_ERR(inode) && (inode->i_state & I_NEW)) | |
116 | unlock_new_inode(inode); | |
117 | ||
c4f79073 | 118 | return inode; |
c4f79073 TH |
119 | } |
120 | ||
c4f79073 TH |
121 | /** |
122 | * ecryptfs_interpose | |
123 | * @lower_dentry: Existing dentry in the lower filesystem | |
124 | * @dentry: ecryptfs' dentry | |
125 | * @sb: ecryptfs's super_block | |
c4f79073 TH |
126 | * |
127 | * Interposes upper and lower dentries. | |
128 | * | |
129 | * Returns zero on success; non-zero otherwise | |
130 | */ | |
131 | static int ecryptfs_interpose(struct dentry *lower_dentry, | |
5ccf9203 | 132 | struct dentry *dentry, struct super_block *sb) |
c4f79073 | 133 | { |
2b0143b5 | 134 | struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); |
5ccf9203 | 135 | |
c4f79073 TH |
136 | if (IS_ERR(inode)) |
137 | return PTR_ERR(inode); | |
5ccf9203 TH |
138 | d_instantiate(dentry, inode); |
139 | ||
c4f79073 TH |
140 | return 0; |
141 | } | |
142 | ||
8bc2d3cf TH |
143 | static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, |
144 | struct inode *inode) | |
145 | { | |
146 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
147 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
148 | struct dentry *lower_dir_dentry; | |
149 | int rc; | |
150 | ||
151 | dget(lower_dentry); | |
152 | lower_dir_dentry = lock_parent(lower_dentry); | |
b21996e3 | 153 | rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); |
8bc2d3cf TH |
154 | if (rc) { |
155 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); | |
156 | goto out_unlock; | |
157 | } | |
158 | fsstack_copy_attr_times(dir, lower_dir_inode); | |
159 | set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); | |
160 | inode->i_ctime = dir->i_ctime; | |
161 | d_drop(dentry); | |
162 | out_unlock: | |
163 | unlock_dir(lower_dir_dentry); | |
164 | dput(lower_dentry); | |
165 | return rc; | |
166 | } | |
167 | ||
237fead6 MH |
168 | /** |
169 | * ecryptfs_do_create | |
170 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
171 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
172 | * @mode: The mode of the new file | |
237fead6 MH |
173 | * |
174 | * Creates the underlying file and the eCryptfs inode which will link to | |
175 | * it. It will also update the eCryptfs directory inode to mimic the | |
176 | * stat of the lower directory inode. | |
177 | * | |
b59db43a | 178 | * Returns the new eCryptfs inode on success; an ERR_PTR on error condition |
237fead6 | 179 | */ |
b59db43a | 180 | static struct inode * |
237fead6 | 181 | ecryptfs_do_create(struct inode *directory_inode, |
175a4eb7 | 182 | struct dentry *ecryptfs_dentry, umode_t mode) |
237fead6 MH |
183 | { |
184 | int rc; | |
185 | struct dentry *lower_dentry; | |
186 | struct dentry *lower_dir_dentry; | |
b59db43a | 187 | struct inode *inode; |
237fead6 MH |
188 | |
189 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
190 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 | 191 | rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true); |
4981e081 | 192 | if (rc) { |
caeeeecf | 193 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 194 | "rc = [%d]\n", __func__, rc); |
b59db43a | 195 | inode = ERR_PTR(rc); |
caeeeecf | 196 | goto out_lock; |
237fead6 | 197 | } |
2b0143b5 | 198 | inode = __ecryptfs_get_inode(d_inode(lower_dentry), |
b59db43a | 199 | directory_inode->i_sb); |
8bc2d3cf | 200 | if (IS_ERR(inode)) { |
2b0143b5 | 201 | vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL); |
237fead6 | 202 | goto out_lock; |
8bc2d3cf | 203 | } |
2b0143b5 DH |
204 | fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); |
205 | fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); | |
237fead6 MH |
206 | out_lock: |
207 | unlock_dir(lower_dir_dentry); | |
b59db43a | 208 | return inode; |
237fead6 MH |
209 | } |
210 | ||
237fead6 MH |
211 | /** |
212 | * ecryptfs_initialize_file | |
213 | * | |
214 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
215 | * file with a header and first data page. | |
216 | * | |
217 | * Returns zero on success | |
218 | */ | |
e3ccaa97 TH |
219 | int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, |
220 | struct inode *ecryptfs_inode) | |
237fead6 | 221 | { |
d7cdc5fe | 222 | struct ecryptfs_crypt_stat *crypt_stat = |
b59db43a | 223 | &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; |
237fead6 | 224 | int rc = 0; |
237fead6 | 225 | |
b59db43a | 226 | if (S_ISDIR(ecryptfs_inode->i_mode)) { |
237fead6 | 227 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); |
e2bd99ec | 228 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 229 | goto out; |
237fead6 | 230 | } |
237fead6 | 231 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
b59db43a | 232 | rc = ecryptfs_new_file_context(ecryptfs_inode); |
237fead6 | 233 | if (rc) { |
d7cdc5fe MH |
234 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
235 | "context; rc = [%d]\n", rc); | |
236 | goto out; | |
237fead6 | 237 | } |
b59db43a | 238 | rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); |
27992890 RS |
239 | if (rc) { |
240 | printk(KERN_ERR "%s: Error attempting to initialize " | |
332ab16f | 241 | "the lower file for the dentry with name " |
9e78d14a DH |
242 | "[%pd]; rc = [%d]\n", __func__, |
243 | ecryptfs_dentry, rc); | |
27992890 | 244 | goto out; |
391b52f9 | 245 | } |
b59db43a | 246 | rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); |
332ab16f | 247 | if (rc) |
d7cdc5fe | 248 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
b59db43a | 249 | ecryptfs_put_lower_file(ecryptfs_inode); |
237fead6 MH |
250 | out: |
251 | return rc; | |
252 | } | |
253 | ||
254 | /** | |
255 | * ecryptfs_create | |
256 | * @dir: The inode of the directory in which to create the file. | |
257 | * @dentry: The eCryptfs dentry | |
258 | * @mode: The mode of the new file. | |
237fead6 MH |
259 | * |
260 | * Creates a new file. | |
261 | * | |
262 | * Returns zero on success; non-zero on error condition | |
263 | */ | |
264 | static int | |
265 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
ebfc3b49 | 266 | umode_t mode, bool excl) |
237fead6 | 267 | { |
b59db43a | 268 | struct inode *ecryptfs_inode; |
237fead6 MH |
269 | int rc; |
270 | ||
b59db43a TH |
271 | ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, |
272 | mode); | |
a1c83681 | 273 | if (IS_ERR(ecryptfs_inode)) { |
237fead6 MH |
274 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
275 | "lower filesystem\n"); | |
b59db43a | 276 | rc = PTR_ERR(ecryptfs_inode); |
237fead6 MH |
277 | goto out; |
278 | } | |
279 | /* At this point, a file exists on "disk"; we need to make sure | |
280 | * that this on disk file is prepared to be an ecryptfs file */ | |
b59db43a TH |
281 | rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); |
282 | if (rc) { | |
8bc2d3cf TH |
283 | ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, |
284 | ecryptfs_inode); | |
285 | make_bad_inode(ecryptfs_inode); | |
b59db43a TH |
286 | unlock_new_inode(ecryptfs_inode); |
287 | iput(ecryptfs_inode); | |
288 | goto out; | |
289 | } | |
b59db43a | 290 | unlock_new_inode(ecryptfs_inode); |
8fc37ec5 | 291 | d_instantiate(ecryptfs_dentry, ecryptfs_inode); |
237fead6 MH |
292 | out: |
293 | return rc; | |
294 | } | |
295 | ||
778aeb42 TH |
296 | static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) |
297 | { | |
298 | struct ecryptfs_crypt_stat *crypt_stat; | |
299 | int rc; | |
300 | ||
301 | rc = ecryptfs_get_lower_file(dentry, inode); | |
302 | if (rc) { | |
303 | printk(KERN_ERR "%s: Error attempting to initialize " | |
304 | "the lower file for the dentry with name " | |
9e78d14a DH |
305 | "[%pd]; rc = [%d]\n", __func__, |
306 | dentry, rc); | |
778aeb42 TH |
307 | return rc; |
308 | } | |
309 | ||
310 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
311 | /* TODO: lock for crypt_stat comparison */ | |
312 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
313 | ecryptfs_set_default_sizes(crypt_stat); | |
314 | ||
315 | rc = ecryptfs_read_and_validate_header_region(inode); | |
316 | ecryptfs_put_lower_file(inode); | |
317 | if (rc) { | |
318 | rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); | |
319 | if (!rc) | |
320 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; | |
321 | } | |
322 | ||
323 | /* Must return 0 to allow non-eCryptfs files to be looked up, too */ | |
324 | return 0; | |
325 | } | |
326 | ||
237fead6 | 327 | /** |
5ccf9203 | 328 | * ecryptfs_lookup_interpose - Dentry interposition for a lookup |
237fead6 | 329 | */ |
778aeb42 | 330 | static int ecryptfs_lookup_interpose(struct dentry *dentry, |
5ccf9203 | 331 | struct dentry *lower_dentry, |
778aeb42 | 332 | struct inode *dir_inode) |
237fead6 | 333 | { |
2b0143b5 | 334 | struct inode *inode, *lower_inode = d_inode(lower_dentry); |
778aeb42 | 335 | struct ecryptfs_dentry_info *dentry_info; |
237fead6 | 336 | struct vfsmount *lower_mnt; |
778aeb42 TH |
337 | int rc = 0; |
338 | ||
778aeb42 | 339 | dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); |
778aeb42 | 340 | if (!dentry_info) { |
addd65ad MH |
341 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
342 | "to allocate ecryptfs_dentry_info struct\n", | |
343 | __func__); | |
778aeb42 | 344 | dput(lower_dentry); |
778aeb42 | 345 | return -ENOMEM; |
237fead6 | 346 | } |
0b1d9011 AV |
347 | |
348 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); | |
2b0143b5 | 349 | fsstack_copy_attr_atime(dir_inode, d_inode(lower_dentry->d_parent)); |
84d08fa8 | 350 | BUG_ON(!d_count(lower_dentry)); |
0b1d9011 AV |
351 | |
352 | ecryptfs_set_dentry_private(dentry, dentry_info); | |
92dd1230 AV |
353 | dentry_info->lower_path.mnt = lower_mnt; |
354 | dentry_info->lower_path.dentry = lower_dentry; | |
778aeb42 | 355 | |
2b0143b5 | 356 | if (d_really_is_negative(lower_dentry)) { |
237fead6 | 357 | /* We want to add because we couldn't find in lower */ |
778aeb42 TH |
358 | d_add(dentry, NULL); |
359 | return 0; | |
237fead6 | 360 | } |
778aeb42 | 361 | inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); |
5ccf9203 | 362 | if (IS_ERR(inode)) { |
778aeb42 TH |
363 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", |
364 | __func__, PTR_ERR(inode)); | |
365 | return PTR_ERR(inode); | |
391b52f9 | 366 | } |
778aeb42 TH |
367 | if (S_ISREG(inode->i_mode)) { |
368 | rc = ecryptfs_i_size_read(dentry, inode); | |
dd2a3b7a | 369 | if (rc) { |
778aeb42 TH |
370 | make_bad_inode(inode); |
371 | return rc; | |
237fead6 | 372 | } |
237fead6 | 373 | } |
778aeb42 | 374 | |
3b06b3eb TH |
375 | if (inode->i_state & I_NEW) |
376 | unlock_new_inode(inode); | |
778aeb42 TH |
377 | d_add(dentry, inode); |
378 | ||
addd65ad MH |
379 | return rc; |
380 | } | |
381 | ||
382 | /** | |
383 | * ecryptfs_lookup | |
384 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
385 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
89076bc3 | 386 | * @flags: lookup flags |
addd65ad MH |
387 | * |
388 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
389 | * dentry cache and continue on to read it from the disk. | |
390 | */ | |
391 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
392 | struct dentry *ecryptfs_dentry, | |
00cd8dd3 | 393 | unsigned int flags) |
addd65ad MH |
394 | { |
395 | char *encrypted_and_encoded_name = NULL; | |
a8f12864 | 396 | size_t encrypted_and_encoded_name_size; |
addd65ad | 397 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
addd65ad MH |
398 | struct dentry *lower_dir_dentry, *lower_dentry; |
399 | int rc = 0; | |
400 | ||
addd65ad | 401 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); |
2b0143b5 | 402 | mutex_lock(&d_inode(lower_dir_dentry)->i_mutex); |
8787c7a3 TH |
403 | lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, |
404 | lower_dir_dentry, | |
405 | ecryptfs_dentry->d_name.len); | |
2b0143b5 | 406 | mutex_unlock(&d_inode(lower_dir_dentry)->i_mutex); |
addd65ad MH |
407 | if (IS_ERR(lower_dentry)) { |
408 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 409 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9e78d14a DH |
410 | "[%d] on lower_dentry = [%pd]\n", __func__, rc, |
411 | ecryptfs_dentry); | |
bc65a121 | 412 | goto out; |
addd65ad | 413 | } |
2b0143b5 | 414 | if (d_really_is_positive(lower_dentry)) |
5ccf9203 | 415 | goto interpose; |
2aac0cf8 TH |
416 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
417 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
418 | if (!(mount_crypt_stat | |
419 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) | |
5ccf9203 | 420 | goto interpose; |
addd65ad MH |
421 | dput(lower_dentry); |
422 | rc = ecryptfs_encrypt_and_encode_filename( | |
423 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, | |
2aac0cf8 | 424 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
addd65ad MH |
425 | ecryptfs_dentry->d_name.len); |
426 | if (rc) { | |
427 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
428 | "filename; rc = [%d]\n", __func__, rc); | |
bc65a121 | 429 | goto out; |
addd65ad | 430 | } |
2b0143b5 | 431 | mutex_lock(&d_inode(lower_dir_dentry)->i_mutex); |
8787c7a3 TH |
432 | lower_dentry = lookup_one_len(encrypted_and_encoded_name, |
433 | lower_dir_dentry, | |
434 | encrypted_and_encoded_name_size); | |
2b0143b5 | 435 | mutex_unlock(&d_inode(lower_dir_dentry)->i_mutex); |
addd65ad MH |
436 | if (IS_ERR(lower_dentry)) { |
437 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 438 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
439 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
440 | encrypted_and_encoded_name); | |
bc65a121 | 441 | goto out; |
addd65ad | 442 | } |
5ccf9203 TH |
443 | interpose: |
444 | rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, | |
445 | ecryptfs_dir_inode); | |
237fead6 | 446 | out: |
addd65ad | 447 | kfree(encrypted_and_encoded_name); |
237fead6 MH |
448 | return ERR_PTR(rc); |
449 | } | |
450 | ||
451 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
452 | struct dentry *new_dentry) | |
453 | { | |
454 | struct dentry *lower_old_dentry; | |
455 | struct dentry *lower_new_dentry; | |
456 | struct dentry *lower_dir_dentry; | |
457 | u64 file_size_save; | |
458 | int rc; | |
459 | ||
2b0143b5 | 460 | file_size_save = i_size_read(d_inode(old_dentry)); |
237fead6 MH |
461 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
462 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
463 | dget(lower_old_dentry); | |
464 | dget(lower_new_dentry); | |
465 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
2b0143b5 | 466 | rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), |
146a8595 | 467 | lower_new_dentry, NULL); |
2b0143b5 | 468 | if (rc || d_really_is_negative(lower_new_dentry)) |
237fead6 | 469 | goto out_lock; |
5ccf9203 | 470 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
237fead6 MH |
471 | if (rc) |
472 | goto out_lock; | |
2b0143b5 DH |
473 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
474 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
475 | set_nlink(d_inode(old_dentry), | |
476 | ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); | |
477 | i_size_write(d_inode(new_dentry), file_size_save); | |
237fead6 MH |
478 | out_lock: |
479 | unlock_dir(lower_dir_dentry); | |
480 | dput(lower_new_dentry); | |
481 | dput(lower_old_dentry); | |
237fead6 MH |
482 | return rc; |
483 | } | |
484 | ||
485 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
486 | { | |
2b0143b5 | 487 | return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); |
237fead6 MH |
488 | } |
489 | ||
490 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
491 | const char *symname) | |
492 | { | |
493 | int rc; | |
494 | struct dentry *lower_dentry; | |
495 | struct dentry *lower_dir_dentry; | |
237fead6 | 496 | char *encoded_symname; |
addd65ad MH |
497 | size_t encoded_symlen; |
498 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
499 | |
500 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
501 | dget(lower_dentry); | |
502 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
503 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
504 | dir->i_sb)->mount_crypt_stat; | |
505 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
506 | &encoded_symlen, | |
507 | NULL, | |
508 | mount_crypt_stat, symname, | |
509 | strlen(symname)); | |
510 | if (rc) | |
237fead6 | 511 | goto out_lock; |
2b0143b5 | 512 | rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry, |
db2e747b | 513 | encoded_symname); |
237fead6 | 514 | kfree(encoded_symname); |
2b0143b5 | 515 | if (rc || d_really_is_negative(lower_dentry)) |
237fead6 | 516 | goto out_lock; |
5ccf9203 | 517 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
518 | if (rc) |
519 | goto out_lock; | |
2b0143b5 DH |
520 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
521 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
237fead6 MH |
522 | out_lock: |
523 | unlock_dir(lower_dir_dentry); | |
524 | dput(lower_dentry); | |
2b0143b5 | 525 | if (d_really_is_negative(dentry)) |
237fead6 MH |
526 | d_drop(dentry); |
527 | return rc; | |
528 | } | |
529 | ||
18bb1db3 | 530 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
237fead6 MH |
531 | { |
532 | int rc; | |
533 | struct dentry *lower_dentry; | |
534 | struct dentry *lower_dir_dentry; | |
535 | ||
536 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
537 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 DH |
538 | rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode); |
539 | if (rc || d_really_is_negative(lower_dentry)) | |
237fead6 | 540 | goto out; |
5ccf9203 | 541 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
542 | if (rc) |
543 | goto out; | |
2b0143b5 DH |
544 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
545 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
546 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); | |
237fead6 MH |
547 | out: |
548 | unlock_dir(lower_dir_dentry); | |
2b0143b5 | 549 | if (d_really_is_negative(dentry)) |
237fead6 MH |
550 | d_drop(dentry); |
551 | return rc; | |
552 | } | |
553 | ||
554 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
555 | { | |
237fead6 | 556 | struct dentry *lower_dentry; |
237fead6 | 557 | struct dentry *lower_dir_dentry; |
45ec4aba | 558 | int rc; |
237fead6 MH |
559 | |
560 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 561 | dget(dentry); |
237fead6 | 562 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 563 | dget(lower_dentry); |
2b0143b5 | 564 | rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry); |
45ec4aba | 565 | dput(lower_dentry); |
2b0143b5 DH |
566 | if (!rc && d_really_is_positive(dentry)) |
567 | clear_nlink(d_inode(dentry)); | |
568 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); | |
569 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); | |
237fead6 MH |
570 | unlock_dir(lower_dir_dentry); |
571 | if (!rc) | |
572 | d_drop(dentry); | |
45ec4aba | 573 | dput(dentry); |
237fead6 MH |
574 | return rc; |
575 | } | |
576 | ||
577 | static int | |
1a67aafb | 578 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
237fead6 MH |
579 | { |
580 | int rc; | |
581 | struct dentry *lower_dentry; | |
582 | struct dentry *lower_dir_dentry; | |
583 | ||
584 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
585 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 DH |
586 | rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev); |
587 | if (rc || d_really_is_negative(lower_dentry)) | |
237fead6 | 588 | goto out; |
5ccf9203 | 589 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
590 | if (rc) |
591 | goto out; | |
2b0143b5 DH |
592 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
593 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
237fead6 MH |
594 | out: |
595 | unlock_dir(lower_dir_dentry); | |
2b0143b5 | 596 | if (d_really_is_negative(dentry)) |
237fead6 MH |
597 | d_drop(dentry); |
598 | return rc; | |
599 | } | |
600 | ||
601 | static int | |
602 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
603 | struct inode *new_dir, struct dentry *new_dentry) | |
604 | { | |
605 | int rc; | |
606 | struct dentry *lower_old_dentry; | |
607 | struct dentry *lower_new_dentry; | |
608 | struct dentry *lower_old_dir_dentry; | |
609 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 610 | struct dentry *trap = NULL; |
8335eafc | 611 | struct inode *target_inode; |
237fead6 MH |
612 | |
613 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
614 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
615 | dget(lower_old_dentry); | |
616 | dget(lower_new_dentry); | |
617 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
618 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
2b0143b5 | 619 | target_inode = d_inode(new_dentry); |
0d132f73 EZ |
620 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
621 | /* source should not be ancestor of target */ | |
622 | if (trap == lower_old_dentry) { | |
623 | rc = -EINVAL; | |
624 | goto out_lock; | |
625 | } | |
626 | /* target should not be ancestor of source */ | |
627 | if (trap == lower_new_dentry) { | |
628 | rc = -ENOTEMPTY; | |
629 | goto out_lock; | |
630 | } | |
2b0143b5 DH |
631 | rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, |
632 | d_inode(lower_new_dir_dentry), lower_new_dentry, | |
520c8b16 | 633 | NULL, 0); |
237fead6 MH |
634 | if (rc) |
635 | goto out_lock; | |
8335eafc TH |
636 | if (target_inode) |
637 | fsstack_copy_attr_all(target_inode, | |
638 | ecryptfs_inode_to_lower(target_inode)); | |
2b0143b5 | 639 | fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); |
237fead6 | 640 | if (new_dir != old_dir) |
2b0143b5 | 641 | fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); |
237fead6 MH |
642 | out_lock: |
643 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
dd55c898 TH |
644 | dput(lower_new_dir_dentry); |
645 | dput(lower_old_dir_dentry); | |
237fead6 MH |
646 | dput(lower_new_dentry); |
647 | dput(lower_old_dentry); | |
648 | return rc; | |
649 | } | |
650 | ||
b22e8fed | 651 | static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) |
237fead6 | 652 | { |
3a60a168 | 653 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
237fead6 | 654 | char *lower_buf; |
b22e8fed | 655 | char *buf; |
addd65ad MH |
656 | mm_segment_t old_fs; |
657 | int rc; | |
237fead6 | 658 | |
408bd629 | 659 | lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); |
b22e8fed AV |
660 | if (!lower_buf) |
661 | return ERR_PTR(-ENOMEM); | |
237fead6 MH |
662 | old_fs = get_fs(); |
663 | set_fs(get_ds()); | |
2b0143b5 | 664 | rc = d_inode(lower_dentry)->i_op->readlink(lower_dentry, |
237fead6 | 665 | (char __user *)lower_buf, |
408bd629 | 666 | PATH_MAX); |
237fead6 | 667 | set_fs(old_fs); |
3a60a168 TH |
668 | if (rc < 0) |
669 | goto out; | |
b22e8fed | 670 | rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, |
408bd629 | 671 | lower_buf, rc); |
3a60a168 | 672 | out: |
237fead6 | 673 | kfree(lower_buf); |
b22e8fed | 674 | return rc ? ERR_PTR(rc) : buf; |
3a60a168 TH |
675 | } |
676 | ||
6b255391 | 677 | static const char *ecryptfs_get_link(struct dentry *dentry, |
fceef393 AV |
678 | struct inode *inode, |
679 | struct delayed_call *done) | |
3a60a168 | 680 | { |
b22e8fed | 681 | size_t len; |
6b255391 AV |
682 | char *buf; |
683 | ||
684 | if (!dentry) | |
685 | return ERR_PTR(-ECHILD); | |
686 | ||
687 | buf = ecryptfs_readlink_lower(dentry, &len); | |
b22e8fed | 688 | if (IS_ERR(buf)) |
680baacb | 689 | return buf; |
2b0143b5 DH |
690 | fsstack_copy_attr_atime(d_inode(dentry), |
691 | d_inode(ecryptfs_dentry_to_lower(dentry))); | |
408bd629 | 692 | buf[len] = '\0'; |
fceef393 AV |
693 | set_delayed_call(done, kfree_link, buf); |
694 | return buf; | |
237fead6 MH |
695 | } |
696 | ||
237fead6 MH |
697 | /** |
698 | * upper_size_to_lower_size | |
699 | * @crypt_stat: Crypt_stat associated with file | |
700 | * @upper_size: Size of the upper file | |
701 | * | |
cc11beff | 702 | * Calculate the required size of the lower file based on the |
237fead6 MH |
703 | * specified size of the upper file. This calculation is based on the |
704 | * number of headers in the underlying file and the extent size. | |
705 | * | |
706 | * Returns Calculated size of the lower file. | |
707 | */ | |
708 | static loff_t | |
709 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
710 | loff_t upper_size) | |
711 | { | |
712 | loff_t lower_size; | |
713 | ||
157f1071 | 714 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
715 | if (upper_size != 0) { |
716 | loff_t num_extents; | |
717 | ||
718 | num_extents = upper_size >> crypt_stat->extent_shift; | |
719 | if (upper_size & ~crypt_stat->extent_mask) | |
720 | num_extents++; | |
721 | lower_size += (num_extents * crypt_stat->extent_size); | |
722 | } | |
723 | return lower_size; | |
724 | } | |
725 | ||
726 | /** | |
5f3ef64f | 727 | * truncate_upper |
237fead6 | 728 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
729 | * @ia: Address of the ecryptfs inode's attributes |
730 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
731 | * |
732 | * Function to handle truncations modifying the size of the file. Note | |
733 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
734 | * writing strings of 0's out. When truncating, we truncate the upper |
735 | * inode and update the lower_ia according to the page index | |
736 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
737 | * the caller must use lower_ia in a call to notify_change() to perform | |
738 | * the truncation of the lower inode. | |
237fead6 MH |
739 | * |
740 | * Returns zero on success; non-zero otherwise | |
741 | */ | |
5f3ef64f TH |
742 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
743 | struct iattr *lower_ia) | |
237fead6 MH |
744 | { |
745 | int rc = 0; | |
2b0143b5 | 746 | struct inode *inode = d_inode(dentry); |
237fead6 MH |
747 | struct ecryptfs_crypt_stat *crypt_stat; |
748 | loff_t i_size = i_size_read(inode); | |
749 | loff_t lower_size_before_truncate; | |
750 | loff_t lower_size_after_truncate; | |
751 | ||
5f3ef64f TH |
752 | if (unlikely((ia->ia_size == i_size))) { |
753 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 754 | return 0; |
5f3ef64f | 755 | } |
3b06b3eb | 756 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
757 | if (rc) |
758 | return rc; | |
2b0143b5 | 759 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
237fead6 | 760 | /* Switch on growing or shrinking file */ |
5f3ef64f | 761 | if (ia->ia_size > i_size) { |
2ed92554 MH |
762 | char zero[] = { 0x00 }; |
763 | ||
5f3ef64f | 764 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
765 | /* Write a single 0 at the last position of the file; |
766 | * this triggers code that will fill in 0's throughout | |
767 | * the intermediate portion of the previous end of the | |
768 | * file and the new and of the file */ | |
48c1e44a | 769 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
770 | (ia->ia_size - 1), 1); |
771 | } else { /* ia->ia_size < i_size_read(inode) */ | |
772 | /* We're chopping off all the pages down to the page | |
773 | * in which ia->ia_size is located. Fill in the end of | |
774 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to | |
2ed92554 MH |
775 | * PAGE_CACHE_SIZE with zeros. */ |
776 | size_t num_zeros = (PAGE_CACHE_SIZE | |
5f3ef64f | 777 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
2ed92554 | 778 | |
13a791b4 | 779 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 780 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
781 | lower_ia->ia_size = ia->ia_size; |
782 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 783 | goto out; |
13a791b4 | 784 | } |
2ed92554 MH |
785 | if (num_zeros) { |
786 | char *zeros_virt; | |
787 | ||
788 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
789 | if (!zeros_virt) { | |
790 | rc = -ENOMEM; | |
48c1e44a | 791 | goto out; |
2ed92554 | 792 | } |
48c1e44a | 793 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 794 | ia->ia_size, num_zeros); |
2ed92554 | 795 | kfree(zeros_virt); |
5dda6992 | 796 | if (rc) { |
240e2df5 MH |
797 | printk(KERN_ERR "Error attempting to zero out " |
798 | "the remainder of the end page on " | |
799 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 800 | goto out; |
240e2df5 MH |
801 | } |
802 | } | |
2c27c65e | 803 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 804 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
805 | if (rc) { |
806 | printk(KERN_ERR "Problem with " | |
807 | "ecryptfs_write_inode_size_to_metadata; " | |
808 | "rc = [%d]\n", rc); | |
48c1e44a | 809 | goto out; |
dd2a3b7a | 810 | } |
237fead6 MH |
811 | /* We are reducing the size of the ecryptfs file, and need to |
812 | * know if we need to reduce the size of the lower file. */ | |
813 | lower_size_before_truncate = | |
814 | upper_size_to_lower_size(crypt_stat, i_size); | |
815 | lower_size_after_truncate = | |
5f3ef64f TH |
816 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
817 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
818 | lower_ia->ia_size = lower_size_after_truncate; | |
819 | lower_ia->ia_valid |= ATTR_SIZE; | |
820 | } else | |
821 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 822 | } |
237fead6 | 823 | out: |
332ab16f | 824 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
825 | return rc; |
826 | } | |
827 | ||
a261a039 TH |
828 | static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) |
829 | { | |
830 | struct ecryptfs_crypt_stat *crypt_stat; | |
831 | loff_t lower_oldsize, lower_newsize; | |
832 | ||
833 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
834 | lower_oldsize = upper_size_to_lower_size(crypt_stat, | |
835 | i_size_read(inode)); | |
836 | lower_newsize = upper_size_to_lower_size(crypt_stat, offset); | |
837 | if (lower_newsize > lower_oldsize) { | |
838 | /* | |
839 | * The eCryptfs inode and the new *lower* size are mixed here | |
840 | * because we may not have the lower i_mutex held and/or it may | |
841 | * not be appropriate to call inode_newsize_ok() with inodes | |
842 | * from other filesystems. | |
843 | */ | |
844 | return inode_newsize_ok(inode, lower_newsize); | |
845 | } | |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
5f3ef64f TH |
850 | /** |
851 | * ecryptfs_truncate | |
852 | * @dentry: The ecryptfs layer dentry | |
853 | * @new_length: The length to expand the file to | |
854 | * | |
855 | * Simple function that handles the truncation of an eCryptfs inode and | |
856 | * its corresponding lower inode. | |
857 | * | |
858 | * Returns zero on success; non-zero otherwise | |
859 | */ | |
860 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
861 | { | |
862 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
863 | struct iattr lower_ia = { .ia_valid = 0 }; | |
864 | int rc; | |
865 | ||
2b0143b5 | 866 | rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); |
a261a039 TH |
867 | if (rc) |
868 | return rc; | |
869 | ||
5f3ef64f TH |
870 | rc = truncate_upper(dentry, &ia, &lower_ia); |
871 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
872 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
873 | ||
2b0143b5 | 874 | mutex_lock(&d_inode(lower_dentry)->i_mutex); |
27ac0ffe | 875 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
2b0143b5 | 876 | mutex_unlock(&d_inode(lower_dentry)->i_mutex); |
5f3ef64f TH |
877 | } |
878 | return rc; | |
879 | } | |
880 | ||
237fead6 | 881 | static int |
10556cb2 | 882 | ecryptfs_permission(struct inode *inode, int mask) |
237fead6 | 883 | { |
f419a2e3 | 884 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
885 | } |
886 | ||
887 | /** | |
888 | * ecryptfs_setattr | |
889 | * @dentry: dentry handle to the inode to modify | |
890 | * @ia: Structure with flags of what to change and values | |
891 | * | |
892 | * Updates the metadata of an inode. If the update is to the size | |
893 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
894 | * of both the ecryptfs inode and the lower inode. | |
895 | * | |
896 | * All other metadata changes will be passed right to the lower filesystem, | |
897 | * and we will just update our inode to look like the lower. | |
898 | */ | |
899 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
900 | { | |
901 | int rc = 0; | |
902 | struct dentry *lower_dentry; | |
5f3ef64f | 903 | struct iattr lower_ia; |
237fead6 MH |
904 | struct inode *inode; |
905 | struct inode *lower_inode; | |
906 | struct ecryptfs_crypt_stat *crypt_stat; | |
907 | ||
2b0143b5 | 908 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
e10f281b MH |
909 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
910 | ecryptfs_init_crypt_stat(crypt_stat); | |
2b0143b5 | 911 | inode = d_inode(dentry); |
237fead6 | 912 | lower_inode = ecryptfs_inode_to_lower(inode); |
e10f281b MH |
913 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
914 | mutex_lock(&crypt_stat->cs_mutex); | |
e36cb0b8 | 915 | if (d_is_dir(dentry)) |
e10f281b | 916 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
e36cb0b8 | 917 | else if (d_is_reg(dentry) |
64ee4808 MH |
918 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) |
919 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 920 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 921 | |
e10f281b MH |
922 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
923 | dentry->d_sb)->mount_crypt_stat; | |
3b06b3eb | 924 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
925 | if (rc) { |
926 | mutex_unlock(&crypt_stat->cs_mutex); | |
927 | goto out; | |
928 | } | |
d7cdc5fe | 929 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 930 | ecryptfs_put_lower_file(inode); |
5dda6992 | 931 | if (rc) { |
e10f281b MH |
932 | if (!(mount_crypt_stat->flags |
933 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
934 | rc = -EIO; | |
25bd8174 | 935 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 936 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
937 | "or the key could not be retrieved. " |
938 | "Plaintext passthrough mode is not " | |
e10f281b | 939 | "enabled; returning -EIO\n"); |
e10f281b | 940 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
941 | goto out; |
942 | } | |
943 | rc = 0; | |
3aeb86ea TH |
944 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
945 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 946 | } |
e10f281b MH |
947 | } |
948 | mutex_unlock(&crypt_stat->cs_mutex); | |
a261a039 TH |
949 | |
950 | rc = inode_change_ok(inode, ia); | |
951 | if (rc) | |
952 | goto out; | |
953 | if (ia->ia_valid & ATTR_SIZE) { | |
954 | rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); | |
955 | if (rc) | |
956 | goto out; | |
957 | } | |
958 | ||
5f3ef64f TH |
959 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
960 | if (ia->ia_valid & ATTR_FILE) | |
961 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 962 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 963 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
964 | if (rc < 0) |
965 | goto out; | |
966 | } | |
1ac564ec JL |
967 | |
968 | /* | |
969 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
970 | * to interpret this in its own way. | |
971 | */ | |
5f3ef64f TH |
972 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
973 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 974 | |
2b0143b5 | 975 | mutex_lock(&d_inode(lower_dentry)->i_mutex); |
27ac0ffe | 976 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
2b0143b5 | 977 | mutex_unlock(&d_inode(lower_dentry)->i_mutex); |
237fead6 | 978 | out: |
9afa2fb6 | 979 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
980 | return rc; |
981 | } | |
982 | ||
111d61a2 TH |
983 | static int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
984 | struct kstat *stat) | |
3a60a168 TH |
985 | { |
986 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; | |
987 | int rc = 0; | |
988 | ||
989 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
990 | dentry->d_sb)->mount_crypt_stat; | |
2b0143b5 | 991 | generic_fillattr(d_inode(dentry), stat); |
3a60a168 TH |
992 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
993 | char *target; | |
994 | size_t targetsiz; | |
995 | ||
b22e8fed AV |
996 | target = ecryptfs_readlink_lower(dentry, &targetsiz); |
997 | if (!IS_ERR(target)) { | |
3a60a168 TH |
998 | kfree(target); |
999 | stat->size = targetsiz; | |
b22e8fed AV |
1000 | } else { |
1001 | rc = PTR_ERR(target); | |
3a60a168 TH |
1002 | } |
1003 | } | |
1004 | return rc; | |
1005 | } | |
1006 | ||
111d61a2 TH |
1007 | static int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1008 | struct kstat *stat) | |
f8f484d1 TH |
1009 | { |
1010 | struct kstat lower_stat; | |
1011 | int rc; | |
1012 | ||
3dadecce | 1013 | rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat); |
f8f484d1 | 1014 | if (!rc) { |
2b0143b5 DH |
1015 | fsstack_copy_attr_all(d_inode(dentry), |
1016 | ecryptfs_inode_to_lower(d_inode(dentry))); | |
1017 | generic_fillattr(d_inode(dentry), stat); | |
f8f484d1 TH |
1018 | stat->blocks = lower_stat.blocks; |
1019 | } | |
1020 | return rc; | |
1021 | } | |
1022 | ||
dd2a3b7a | 1023 | int |
237fead6 MH |
1024 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
1025 | size_t size, int flags) | |
1026 | { | |
1027 | int rc = 0; | |
1028 | struct dentry *lower_dentry; | |
1029 | ||
1030 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2b0143b5 | 1031 | if (!d_inode(lower_dentry)->i_op->setxattr) { |
cfce08c6 | 1032 | rc = -EOPNOTSUPP; |
237fead6 MH |
1033 | goto out; |
1034 | } | |
48b512e6 RS |
1035 | |
1036 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); | |
2b0143b5 DH |
1037 | if (!rc && d_really_is_positive(dentry)) |
1038 | fsstack_copy_attr_all(d_inode(dentry), d_inode(lower_dentry)); | |
237fead6 MH |
1039 | out: |
1040 | return rc; | |
1041 | } | |
1042 | ||
d7cdc5fe MH |
1043 | ssize_t |
1044 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
1045 | void *value, size_t size) | |
1046 | { | |
1047 | int rc = 0; | |
1048 | ||
2b0143b5 | 1049 | if (!d_inode(lower_dentry)->i_op->getxattr) { |
cfce08c6 | 1050 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1051 | goto out; |
1052 | } | |
2b0143b5 DH |
1053 | mutex_lock(&d_inode(lower_dentry)->i_mutex); |
1054 | rc = d_inode(lower_dentry)->i_op->getxattr(lower_dentry, name, value, | |
d7cdc5fe | 1055 | size); |
2b0143b5 | 1056 | mutex_unlock(&d_inode(lower_dentry)->i_mutex); |
d7cdc5fe MH |
1057 | out: |
1058 | return rc; | |
1059 | } | |
1060 | ||
7896b631 | 1061 | static ssize_t |
237fead6 MH |
1062 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
1063 | size_t size) | |
1064 | { | |
2ed92554 MH |
1065 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
1066 | value, size); | |
237fead6 MH |
1067 | } |
1068 | ||
1069 | static ssize_t | |
1070 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1071 | { | |
1072 | int rc = 0; | |
1073 | struct dentry *lower_dentry; | |
1074 | ||
1075 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2b0143b5 | 1076 | if (!d_inode(lower_dentry)->i_op->listxattr) { |
cfce08c6 | 1077 | rc = -EOPNOTSUPP; |
237fead6 MH |
1078 | goto out; |
1079 | } | |
2b0143b5 DH |
1080 | mutex_lock(&d_inode(lower_dentry)->i_mutex); |
1081 | rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); | |
1082 | mutex_unlock(&d_inode(lower_dentry)->i_mutex); | |
237fead6 MH |
1083 | out: |
1084 | return rc; | |
1085 | } | |
1086 | ||
1087 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
1088 | { | |
1089 | int rc = 0; | |
1090 | struct dentry *lower_dentry; | |
1091 | ||
1092 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2b0143b5 | 1093 | if (!d_inode(lower_dentry)->i_op->removexattr) { |
cfce08c6 | 1094 | rc = -EOPNOTSUPP; |
237fead6 MH |
1095 | goto out; |
1096 | } | |
2b0143b5 DH |
1097 | mutex_lock(&d_inode(lower_dentry)->i_mutex); |
1098 | rc = d_inode(lower_dentry)->i_op->removexattr(lower_dentry, name); | |
1099 | mutex_unlock(&d_inode(lower_dentry)->i_mutex); | |
237fead6 MH |
1100 | out: |
1101 | return rc; | |
1102 | } | |
1103 | ||
754661f1 | 1104 | const struct inode_operations ecryptfs_symlink_iops = { |
408bd629 | 1105 | .readlink = generic_readlink, |
6b255391 | 1106 | .get_link = ecryptfs_get_link, |
237fead6 MH |
1107 | .permission = ecryptfs_permission, |
1108 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1109 | .getattr = ecryptfs_getattr_link, |
237fead6 MH |
1110 | .setxattr = ecryptfs_setxattr, |
1111 | .getxattr = ecryptfs_getxattr, | |
1112 | .listxattr = ecryptfs_listxattr, | |
1113 | .removexattr = ecryptfs_removexattr | |
1114 | }; | |
1115 | ||
754661f1 | 1116 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1117 | .create = ecryptfs_create, |
1118 | .lookup = ecryptfs_lookup, | |
1119 | .link = ecryptfs_link, | |
1120 | .unlink = ecryptfs_unlink, | |
1121 | .symlink = ecryptfs_symlink, | |
1122 | .mkdir = ecryptfs_mkdir, | |
1123 | .rmdir = ecryptfs_rmdir, | |
1124 | .mknod = ecryptfs_mknod, | |
1125 | .rename = ecryptfs_rename, | |
1126 | .permission = ecryptfs_permission, | |
1127 | .setattr = ecryptfs_setattr, | |
1128 | .setxattr = ecryptfs_setxattr, | |
1129 | .getxattr = ecryptfs_getxattr, | |
1130 | .listxattr = ecryptfs_listxattr, | |
1131 | .removexattr = ecryptfs_removexattr | |
1132 | }; | |
1133 | ||
754661f1 | 1134 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1135 | .permission = ecryptfs_permission, |
1136 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1137 | .getattr = ecryptfs_getattr, |
237fead6 MH |
1138 | .setxattr = ecryptfs_setxattr, |
1139 | .getxattr = ecryptfs_getxattr, | |
1140 | .listxattr = ecryptfs_listxattr, | |
1141 | .removexattr = ecryptfs_removexattr | |
1142 | }; |