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> | |
0cc72dc7 | 32 | #include <linux/fs_stack.h> |
5a0e3ad6 | 33 | #include <linux/slab.h> |
48b512e6 | 34 | #include <linux/xattr.h> |
0a688ad7 | 35 | #include <asm/unaligned.h> |
237fead6 MH |
36 | #include "ecryptfs_kernel.h" |
37 | ||
38 | static struct dentry *lock_parent(struct dentry *dentry) | |
39 | { | |
40 | struct dentry *dir; | |
41 | ||
8dc4e373 | 42 | dir = dget_parent(dentry); |
5955102c | 43 | inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); |
237fead6 MH |
44 | return dir; |
45 | } | |
46 | ||
237fead6 MH |
47 | static void unlock_dir(struct dentry *dir) |
48 | { | |
5955102c | 49 | inode_unlock(d_inode(dir)); |
237fead6 MH |
50 | dput(dir); |
51 | } | |
52 | ||
c4f79073 TH |
53 | static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) |
54 | { | |
c4cf3ba4 | 55 | return ecryptfs_inode_to_lower(inode) == lower_inode; |
c4f79073 TH |
56 | } |
57 | ||
5ccf9203 | 58 | static int ecryptfs_inode_set(struct inode *inode, void *opaque) |
c4f79073 | 59 | { |
5ccf9203 TH |
60 | struct inode *lower_inode = opaque; |
61 | ||
62 | ecryptfs_set_inode_lower(inode, lower_inode); | |
63 | fsstack_copy_attr_all(inode, lower_inode); | |
64 | /* i_size will be overwritten for encrypted regular files */ | |
65 | fsstack_copy_inode_size(inode, lower_inode); | |
66 | inode->i_ino = lower_inode->i_ino; | |
c4f79073 | 67 | inode->i_mapping->a_ops = &ecryptfs_aops; |
5ccf9203 TH |
68 | |
69 | if (S_ISLNK(inode->i_mode)) | |
70 | inode->i_op = &ecryptfs_symlink_iops; | |
71 | else if (S_ISDIR(inode->i_mode)) | |
72 | inode->i_op = &ecryptfs_dir_iops; | |
73 | else | |
74 | inode->i_op = &ecryptfs_main_iops; | |
75 | ||
76 | if (S_ISDIR(inode->i_mode)) | |
77 | inode->i_fop = &ecryptfs_dir_fops; | |
78 | else if (special_file(inode->i_mode)) | |
79 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
80 | else | |
81 | inode->i_fop = &ecryptfs_main_fops; | |
82 | ||
c4f79073 TH |
83 | return 0; |
84 | } | |
85 | ||
5ccf9203 TH |
86 | static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, |
87 | struct super_block *sb) | |
c4f79073 TH |
88 | { |
89 | struct inode *inode; | |
c4f79073 | 90 | |
5ccf9203 TH |
91 | if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) |
92 | return ERR_PTR(-EXDEV); | |
93 | if (!igrab(lower_inode)) | |
94 | return ERR_PTR(-ESTALE); | |
c4f79073 TH |
95 | inode = iget5_locked(sb, (unsigned long)lower_inode, |
96 | ecryptfs_inode_test, ecryptfs_inode_set, | |
97 | lower_inode); | |
98 | if (!inode) { | |
c4f79073 | 99 | iput(lower_inode); |
5ccf9203 | 100 | return ERR_PTR(-EACCES); |
c4f79073 | 101 | } |
5ccf9203 | 102 | if (!(inode->i_state & I_NEW)) |
c4f79073 | 103 | iput(lower_inode); |
5ccf9203 TH |
104 | |
105 | return inode; | |
106 | } | |
107 | ||
108 | struct inode *ecryptfs_get_inode(struct inode *lower_inode, | |
109 | struct super_block *sb) | |
110 | { | |
111 | struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); | |
112 | ||
113 | if (!IS_ERR(inode) && (inode->i_state & I_NEW)) | |
114 | unlock_new_inode(inode); | |
115 | ||
c4f79073 | 116 | return inode; |
c4f79073 TH |
117 | } |
118 | ||
c4f79073 TH |
119 | /** |
120 | * ecryptfs_interpose | |
121 | * @lower_dentry: Existing dentry in the lower filesystem | |
122 | * @dentry: ecryptfs' dentry | |
123 | * @sb: ecryptfs's super_block | |
c4f79073 TH |
124 | * |
125 | * Interposes upper and lower dentries. | |
126 | * | |
127 | * Returns zero on success; non-zero otherwise | |
128 | */ | |
129 | static int ecryptfs_interpose(struct dentry *lower_dentry, | |
5ccf9203 | 130 | struct dentry *dentry, struct super_block *sb) |
c4f79073 | 131 | { |
2b0143b5 | 132 | struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); |
5ccf9203 | 133 | |
c4f79073 TH |
134 | if (IS_ERR(inode)) |
135 | return PTR_ERR(inode); | |
5ccf9203 TH |
136 | d_instantiate(dentry, inode); |
137 | ||
c4f79073 TH |
138 | return 0; |
139 | } | |
140 | ||
8bc2d3cf TH |
141 | static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, |
142 | struct inode *inode) | |
143 | { | |
144 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
145 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
146 | struct dentry *lower_dir_dentry; | |
147 | int rc; | |
148 | ||
149 | dget(lower_dentry); | |
150 | lower_dir_dentry = lock_parent(lower_dentry); | |
b21996e3 | 151 | rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); |
8bc2d3cf TH |
152 | if (rc) { |
153 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); | |
154 | goto out_unlock; | |
155 | } | |
156 | fsstack_copy_attr_times(dir, lower_dir_inode); | |
157 | set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); | |
158 | inode->i_ctime = dir->i_ctime; | |
159 | d_drop(dentry); | |
160 | out_unlock: | |
161 | unlock_dir(lower_dir_dentry); | |
162 | dput(lower_dentry); | |
163 | return rc; | |
164 | } | |
165 | ||
237fead6 MH |
166 | /** |
167 | * ecryptfs_do_create | |
168 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
169 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
170 | * @mode: The mode of the new file | |
237fead6 MH |
171 | * |
172 | * Creates the underlying file and the eCryptfs inode which will link to | |
173 | * it. It will also update the eCryptfs directory inode to mimic the | |
174 | * stat of the lower directory inode. | |
175 | * | |
b59db43a | 176 | * Returns the new eCryptfs inode on success; an ERR_PTR on error condition |
237fead6 | 177 | */ |
b59db43a | 178 | static struct inode * |
237fead6 | 179 | ecryptfs_do_create(struct inode *directory_inode, |
175a4eb7 | 180 | struct dentry *ecryptfs_dentry, umode_t mode) |
237fead6 MH |
181 | { |
182 | int rc; | |
183 | struct dentry *lower_dentry; | |
184 | struct dentry *lower_dir_dentry; | |
b59db43a | 185 | struct inode *inode; |
237fead6 MH |
186 | |
187 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
188 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 | 189 | rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true); |
4981e081 | 190 | if (rc) { |
caeeeecf | 191 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 192 | "rc = [%d]\n", __func__, rc); |
b59db43a | 193 | inode = ERR_PTR(rc); |
caeeeecf | 194 | goto out_lock; |
237fead6 | 195 | } |
2b0143b5 | 196 | inode = __ecryptfs_get_inode(d_inode(lower_dentry), |
b59db43a | 197 | directory_inode->i_sb); |
8bc2d3cf | 198 | if (IS_ERR(inode)) { |
2b0143b5 | 199 | vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL); |
237fead6 | 200 | goto out_lock; |
8bc2d3cf | 201 | } |
2b0143b5 DH |
202 | fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); |
203 | fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); | |
237fead6 MH |
204 | out_lock: |
205 | unlock_dir(lower_dir_dentry); | |
b59db43a | 206 | return inode; |
237fead6 MH |
207 | } |
208 | ||
237fead6 MH |
209 | /** |
210 | * ecryptfs_initialize_file | |
211 | * | |
212 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
213 | * file with a header and first data page. | |
214 | * | |
215 | * Returns zero on success | |
216 | */ | |
e3ccaa97 TH |
217 | int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, |
218 | struct inode *ecryptfs_inode) | |
237fead6 | 219 | { |
d7cdc5fe | 220 | struct ecryptfs_crypt_stat *crypt_stat = |
b59db43a | 221 | &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; |
237fead6 | 222 | int rc = 0; |
237fead6 | 223 | |
b59db43a | 224 | if (S_ISDIR(ecryptfs_inode->i_mode)) { |
237fead6 | 225 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); |
e2bd99ec | 226 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 227 | goto out; |
237fead6 | 228 | } |
237fead6 | 229 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
b59db43a | 230 | rc = ecryptfs_new_file_context(ecryptfs_inode); |
237fead6 | 231 | if (rc) { |
d7cdc5fe MH |
232 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
233 | "context; rc = [%d]\n", rc); | |
234 | goto out; | |
237fead6 | 235 | } |
b59db43a | 236 | rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); |
27992890 RS |
237 | if (rc) { |
238 | printk(KERN_ERR "%s: Error attempting to initialize " | |
332ab16f | 239 | "the lower file for the dentry with name " |
9e78d14a DH |
240 | "[%pd]; rc = [%d]\n", __func__, |
241 | ecryptfs_dentry, rc); | |
27992890 | 242 | goto out; |
391b52f9 | 243 | } |
b59db43a | 244 | rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); |
332ab16f | 245 | if (rc) |
d7cdc5fe | 246 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
b59db43a | 247 | ecryptfs_put_lower_file(ecryptfs_inode); |
237fead6 MH |
248 | out: |
249 | return rc; | |
250 | } | |
251 | ||
252 | /** | |
253 | * ecryptfs_create | |
254 | * @dir: The inode of the directory in which to create the file. | |
255 | * @dentry: The eCryptfs dentry | |
256 | * @mode: The mode of the new file. | |
237fead6 MH |
257 | * |
258 | * Creates a new file. | |
259 | * | |
260 | * Returns zero on success; non-zero on error condition | |
261 | */ | |
262 | static int | |
263 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
ebfc3b49 | 264 | umode_t mode, bool excl) |
237fead6 | 265 | { |
b59db43a | 266 | struct inode *ecryptfs_inode; |
237fead6 MH |
267 | int rc; |
268 | ||
b59db43a TH |
269 | ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, |
270 | mode); | |
a1c83681 | 271 | if (IS_ERR(ecryptfs_inode)) { |
237fead6 MH |
272 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
273 | "lower filesystem\n"); | |
b59db43a | 274 | rc = PTR_ERR(ecryptfs_inode); |
237fead6 MH |
275 | goto out; |
276 | } | |
277 | /* At this point, a file exists on "disk"; we need to make sure | |
278 | * that this on disk file is prepared to be an ecryptfs file */ | |
b59db43a TH |
279 | rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); |
280 | if (rc) { | |
8bc2d3cf TH |
281 | ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, |
282 | ecryptfs_inode); | |
0e81ba23 | 283 | iget_failed(ecryptfs_inode); |
b59db43a TH |
284 | goto out; |
285 | } | |
b59db43a | 286 | unlock_new_inode(ecryptfs_inode); |
8fc37ec5 | 287 | d_instantiate(ecryptfs_dentry, ecryptfs_inode); |
237fead6 MH |
288 | out: |
289 | return rc; | |
290 | } | |
291 | ||
778aeb42 TH |
292 | static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) |
293 | { | |
294 | struct ecryptfs_crypt_stat *crypt_stat; | |
295 | int rc; | |
296 | ||
297 | rc = ecryptfs_get_lower_file(dentry, inode); | |
298 | if (rc) { | |
299 | printk(KERN_ERR "%s: Error attempting to initialize " | |
300 | "the lower file for the dentry with name " | |
9e78d14a DH |
301 | "[%pd]; rc = [%d]\n", __func__, |
302 | dentry, rc); | |
778aeb42 TH |
303 | return rc; |
304 | } | |
305 | ||
306 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
307 | /* TODO: lock for crypt_stat comparison */ | |
308 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
309 | ecryptfs_set_default_sizes(crypt_stat); | |
310 | ||
311 | rc = ecryptfs_read_and_validate_header_region(inode); | |
312 | ecryptfs_put_lower_file(inode); | |
313 | if (rc) { | |
314 | rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); | |
315 | if (!rc) | |
316 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; | |
317 | } | |
318 | ||
319 | /* Must return 0 to allow non-eCryptfs files to be looked up, too */ | |
320 | return 0; | |
321 | } | |
322 | ||
237fead6 | 323 | /** |
5ccf9203 | 324 | * ecryptfs_lookup_interpose - Dentry interposition for a lookup |
237fead6 | 325 | */ |
b1168a92 AV |
326 | static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, |
327 | struct dentry *lower_dentry) | |
237fead6 | 328 | { |
2b0143b5 | 329 | struct inode *inode, *lower_inode = d_inode(lower_dentry); |
778aeb42 | 330 | struct ecryptfs_dentry_info *dentry_info; |
237fead6 | 331 | struct vfsmount *lower_mnt; |
778aeb42 TH |
332 | int rc = 0; |
333 | ||
778aeb42 | 334 | dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); |
778aeb42 | 335 | if (!dentry_info) { |
778aeb42 | 336 | dput(lower_dentry); |
b1168a92 | 337 | return ERR_PTR(-ENOMEM); |
237fead6 | 338 | } |
0b1d9011 AV |
339 | |
340 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); | |
b1168a92 AV |
341 | fsstack_copy_attr_atime(d_inode(dentry->d_parent), |
342 | d_inode(lower_dentry->d_parent)); | |
84d08fa8 | 343 | BUG_ON(!d_count(lower_dentry)); |
0b1d9011 AV |
344 | |
345 | ecryptfs_set_dentry_private(dentry, dentry_info); | |
92dd1230 AV |
346 | dentry_info->lower_path.mnt = lower_mnt; |
347 | dentry_info->lower_path.dentry = lower_dentry; | |
778aeb42 | 348 | |
2b0143b5 | 349 | if (d_really_is_negative(lower_dentry)) { |
237fead6 | 350 | /* We want to add because we couldn't find in lower */ |
778aeb42 | 351 | d_add(dentry, NULL); |
b1168a92 | 352 | return NULL; |
237fead6 | 353 | } |
b1168a92 | 354 | inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb); |
5ccf9203 | 355 | if (IS_ERR(inode)) { |
778aeb42 TH |
356 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", |
357 | __func__, PTR_ERR(inode)); | |
b1168a92 | 358 | return ERR_CAST(inode); |
391b52f9 | 359 | } |
778aeb42 TH |
360 | if (S_ISREG(inode->i_mode)) { |
361 | rc = ecryptfs_i_size_read(dentry, inode); | |
dd2a3b7a | 362 | if (rc) { |
778aeb42 | 363 | make_bad_inode(inode); |
b1168a92 | 364 | return ERR_PTR(rc); |
237fead6 | 365 | } |
237fead6 | 366 | } |
778aeb42 | 367 | |
3b06b3eb TH |
368 | if (inode->i_state & I_NEW) |
369 | unlock_new_inode(inode); | |
b1168a92 | 370 | return d_splice_alias(inode, dentry); |
addd65ad MH |
371 | } |
372 | ||
373 | /** | |
374 | * ecryptfs_lookup | |
375 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
376 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
89076bc3 | 377 | * @flags: lookup flags |
addd65ad MH |
378 | * |
379 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
380 | * dentry cache and continue on to read it from the disk. | |
381 | */ | |
382 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
383 | struct dentry *ecryptfs_dentry, | |
00cd8dd3 | 384 | unsigned int flags) |
addd65ad MH |
385 | { |
386 | char *encrypted_and_encoded_name = NULL; | |
88ae4ab9 | 387 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
addd65ad | 388 | struct dentry *lower_dir_dentry, *lower_dentry; |
88ae4ab9 AV |
389 | const char *name = ecryptfs_dentry->d_name.name; |
390 | size_t len = ecryptfs_dentry->d_name.len; | |
b1168a92 | 391 | struct dentry *res; |
addd65ad MH |
392 | int rc = 0; |
393 | ||
addd65ad | 394 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); |
88ae4ab9 | 395 | |
2aac0cf8 TH |
396 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
397 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
ab13a921 | 398 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
88ae4ab9 AV |
399 | rc = ecryptfs_encrypt_and_encode_filename( |
400 | &encrypted_and_encoded_name, &len, | |
401 | mount_crypt_stat, name, len); | |
402 | if (rc) { | |
403 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
404 | "filename; rc = [%d]\n", __func__, rc); | |
405 | return ERR_PTR(rc); | |
406 | } | |
407 | name = encrypted_and_encoded_name; | |
addd65ad | 408 | } |
88ae4ab9 AV |
409 | |
410 | lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); | |
addd65ad | 411 | if (IS_ERR(lower_dentry)) { |
8787c7a3 | 412 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
b1168a92 AV |
413 | "[%ld] on lower_dentry = [%s]\n", __func__, |
414 | PTR_ERR(lower_dentry), | |
88ae4ab9 | 415 | name); |
b1168a92 | 416 | res = ERR_CAST(lower_dentry); |
88ae4ab9 AV |
417 | } else { |
418 | res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); | |
addd65ad | 419 | } |
addd65ad | 420 | kfree(encrypted_and_encoded_name); |
b1168a92 | 421 | return res; |
237fead6 MH |
422 | } |
423 | ||
424 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
425 | struct dentry *new_dentry) | |
426 | { | |
427 | struct dentry *lower_old_dentry; | |
428 | struct dentry *lower_new_dentry; | |
429 | struct dentry *lower_dir_dentry; | |
430 | u64 file_size_save; | |
431 | int rc; | |
432 | ||
2b0143b5 | 433 | file_size_save = i_size_read(d_inode(old_dentry)); |
237fead6 MH |
434 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
435 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
436 | dget(lower_old_dentry); | |
437 | dget(lower_new_dentry); | |
438 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
2b0143b5 | 439 | rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), |
146a8595 | 440 | lower_new_dentry, NULL); |
2b0143b5 | 441 | if (rc || d_really_is_negative(lower_new_dentry)) |
237fead6 | 442 | goto out_lock; |
5ccf9203 | 443 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
237fead6 MH |
444 | if (rc) |
445 | goto out_lock; | |
2b0143b5 DH |
446 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
447 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
448 | set_nlink(d_inode(old_dentry), | |
449 | ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); | |
450 | i_size_write(d_inode(new_dentry), file_size_save); | |
237fead6 MH |
451 | out_lock: |
452 | unlock_dir(lower_dir_dentry); | |
453 | dput(lower_new_dentry); | |
454 | dput(lower_old_dentry); | |
237fead6 MH |
455 | return rc; |
456 | } | |
457 | ||
458 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
459 | { | |
2b0143b5 | 460 | return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); |
237fead6 MH |
461 | } |
462 | ||
463 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
464 | const char *symname) | |
465 | { | |
466 | int rc; | |
467 | struct dentry *lower_dentry; | |
468 | struct dentry *lower_dir_dentry; | |
237fead6 | 469 | char *encoded_symname; |
addd65ad MH |
470 | size_t encoded_symlen; |
471 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
472 | |
473 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
474 | dget(lower_dentry); | |
475 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
476 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
477 | dir->i_sb)->mount_crypt_stat; | |
478 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
479 | &encoded_symlen, | |
addd65ad MH |
480 | mount_crypt_stat, symname, |
481 | strlen(symname)); | |
482 | if (rc) | |
237fead6 | 483 | goto out_lock; |
2b0143b5 | 484 | rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry, |
db2e747b | 485 | encoded_symname); |
237fead6 | 486 | kfree(encoded_symname); |
2b0143b5 | 487 | if (rc || d_really_is_negative(lower_dentry)) |
237fead6 | 488 | goto out_lock; |
5ccf9203 | 489 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
490 | if (rc) |
491 | goto out_lock; | |
2b0143b5 DH |
492 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
493 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
237fead6 MH |
494 | out_lock: |
495 | unlock_dir(lower_dir_dentry); | |
496 | dput(lower_dentry); | |
2b0143b5 | 497 | if (d_really_is_negative(dentry)) |
237fead6 MH |
498 | d_drop(dentry); |
499 | return rc; | |
500 | } | |
501 | ||
18bb1db3 | 502 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
237fead6 MH |
503 | { |
504 | int rc; | |
505 | struct dentry *lower_dentry; | |
506 | struct dentry *lower_dir_dentry; | |
507 | ||
508 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
509 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 DH |
510 | rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode); |
511 | if (rc || d_really_is_negative(lower_dentry)) | |
237fead6 | 512 | goto out; |
5ccf9203 | 513 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
514 | if (rc) |
515 | goto out; | |
2b0143b5 DH |
516 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
517 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
518 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); | |
237fead6 MH |
519 | out: |
520 | unlock_dir(lower_dir_dentry); | |
2b0143b5 | 521 | if (d_really_is_negative(dentry)) |
237fead6 MH |
522 | d_drop(dentry); |
523 | return rc; | |
524 | } | |
525 | ||
526 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
527 | { | |
237fead6 | 528 | struct dentry *lower_dentry; |
237fead6 | 529 | struct dentry *lower_dir_dentry; |
45ec4aba | 530 | int rc; |
237fead6 MH |
531 | |
532 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 533 | dget(dentry); |
237fead6 | 534 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 535 | dget(lower_dentry); |
2b0143b5 | 536 | rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry); |
45ec4aba | 537 | dput(lower_dentry); |
2b0143b5 DH |
538 | if (!rc && d_really_is_positive(dentry)) |
539 | clear_nlink(d_inode(dentry)); | |
540 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); | |
541 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); | |
237fead6 MH |
542 | unlock_dir(lower_dir_dentry); |
543 | if (!rc) | |
544 | d_drop(dentry); | |
45ec4aba | 545 | dput(dentry); |
237fead6 MH |
546 | return rc; |
547 | } | |
548 | ||
549 | static int | |
1a67aafb | 550 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
237fead6 MH |
551 | { |
552 | int rc; | |
553 | struct dentry *lower_dentry; | |
554 | struct dentry *lower_dir_dentry; | |
555 | ||
556 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
557 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 DH |
558 | rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev); |
559 | if (rc || d_really_is_negative(lower_dentry)) | |
237fead6 | 560 | goto out; |
5ccf9203 | 561 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
562 | if (rc) |
563 | goto out; | |
2b0143b5 DH |
564 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
565 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
237fead6 MH |
566 | out: |
567 | unlock_dir(lower_dir_dentry); | |
2b0143b5 | 568 | if (d_really_is_negative(dentry)) |
237fead6 MH |
569 | d_drop(dentry); |
570 | return rc; | |
571 | } | |
572 | ||
573 | static int | |
574 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
575 | struct inode *new_dir, struct dentry *new_dentry, |
576 | unsigned int flags) | |
237fead6 MH |
577 | { |
578 | int rc; | |
579 | struct dentry *lower_old_dentry; | |
580 | struct dentry *lower_new_dentry; | |
581 | struct dentry *lower_old_dir_dentry; | |
582 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 583 | struct dentry *trap = NULL; |
8335eafc | 584 | struct inode *target_inode; |
237fead6 | 585 | |
1cd66c93 MS |
586 | if (flags) |
587 | return -EINVAL; | |
588 | ||
237fead6 MH |
589 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
590 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
591 | dget(lower_old_dentry); | |
592 | dget(lower_new_dentry); | |
593 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
594 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
2b0143b5 | 595 | target_inode = d_inode(new_dentry); |
0d132f73 EZ |
596 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
597 | /* source should not be ancestor of target */ | |
598 | if (trap == lower_old_dentry) { | |
599 | rc = -EINVAL; | |
600 | goto out_lock; | |
601 | } | |
602 | /* target should not be ancestor of source */ | |
603 | if (trap == lower_new_dentry) { | |
604 | rc = -ENOTEMPTY; | |
605 | goto out_lock; | |
606 | } | |
2b0143b5 DH |
607 | rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, |
608 | d_inode(lower_new_dir_dentry), lower_new_dentry, | |
520c8b16 | 609 | NULL, 0); |
237fead6 MH |
610 | if (rc) |
611 | goto out_lock; | |
8335eafc TH |
612 | if (target_inode) |
613 | fsstack_copy_attr_all(target_inode, | |
614 | ecryptfs_inode_to_lower(target_inode)); | |
2b0143b5 | 615 | fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); |
237fead6 | 616 | if (new_dir != old_dir) |
2b0143b5 | 617 | fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); |
237fead6 MH |
618 | out_lock: |
619 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
dd55c898 TH |
620 | dput(lower_new_dir_dentry); |
621 | dput(lower_old_dir_dentry); | |
237fead6 MH |
622 | dput(lower_new_dentry); |
623 | dput(lower_old_dentry); | |
624 | return rc; | |
625 | } | |
626 | ||
b22e8fed | 627 | static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) |
237fead6 | 628 | { |
6c988f57 | 629 | DEFINE_DELAYED_CALL(done); |
3a60a168 | 630 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
6c988f57 | 631 | const char *link; |
b22e8fed | 632 | char *buf; |
addd65ad | 633 | int rc; |
237fead6 | 634 | |
6c988f57 MS |
635 | link = vfs_get_link(lower_dentry, &done); |
636 | if (IS_ERR(link)) | |
637 | return ERR_CAST(link); | |
638 | ||
b22e8fed | 639 | rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, |
6c988f57 MS |
640 | link, strlen(link)); |
641 | do_delayed_call(&done); | |
642 | if (rc) | |
643 | return ERR_PTR(rc); | |
644 | ||
645 | return buf; | |
3a60a168 TH |
646 | } |
647 | ||
6b255391 | 648 | static const char *ecryptfs_get_link(struct dentry *dentry, |
fceef393 AV |
649 | struct inode *inode, |
650 | struct delayed_call *done) | |
3a60a168 | 651 | { |
b22e8fed | 652 | size_t len; |
6b255391 AV |
653 | char *buf; |
654 | ||
655 | if (!dentry) | |
656 | return ERR_PTR(-ECHILD); | |
657 | ||
658 | buf = ecryptfs_readlink_lower(dentry, &len); | |
b22e8fed | 659 | if (IS_ERR(buf)) |
680baacb | 660 | return buf; |
2b0143b5 DH |
661 | fsstack_copy_attr_atime(d_inode(dentry), |
662 | d_inode(ecryptfs_dentry_to_lower(dentry))); | |
408bd629 | 663 | buf[len] = '\0'; |
fceef393 AV |
664 | set_delayed_call(done, kfree_link, buf); |
665 | return buf; | |
237fead6 MH |
666 | } |
667 | ||
237fead6 MH |
668 | /** |
669 | * upper_size_to_lower_size | |
670 | * @crypt_stat: Crypt_stat associated with file | |
671 | * @upper_size: Size of the upper file | |
672 | * | |
cc11beff | 673 | * Calculate the required size of the lower file based on the |
237fead6 MH |
674 | * specified size of the upper file. This calculation is based on the |
675 | * number of headers in the underlying file and the extent size. | |
676 | * | |
677 | * Returns Calculated size of the lower file. | |
678 | */ | |
679 | static loff_t | |
680 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
681 | loff_t upper_size) | |
682 | { | |
683 | loff_t lower_size; | |
684 | ||
157f1071 | 685 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
686 | if (upper_size != 0) { |
687 | loff_t num_extents; | |
688 | ||
689 | num_extents = upper_size >> crypt_stat->extent_shift; | |
690 | if (upper_size & ~crypt_stat->extent_mask) | |
691 | num_extents++; | |
692 | lower_size += (num_extents * crypt_stat->extent_size); | |
693 | } | |
694 | return lower_size; | |
695 | } | |
696 | ||
697 | /** | |
5f3ef64f | 698 | * truncate_upper |
237fead6 | 699 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
700 | * @ia: Address of the ecryptfs inode's attributes |
701 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
702 | * |
703 | * Function to handle truncations modifying the size of the file. Note | |
704 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
705 | * writing strings of 0's out. When truncating, we truncate the upper |
706 | * inode and update the lower_ia according to the page index | |
707 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
708 | * the caller must use lower_ia in a call to notify_change() to perform | |
709 | * the truncation of the lower inode. | |
237fead6 MH |
710 | * |
711 | * Returns zero on success; non-zero otherwise | |
712 | */ | |
5f3ef64f TH |
713 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
714 | struct iattr *lower_ia) | |
237fead6 MH |
715 | { |
716 | int rc = 0; | |
2b0143b5 | 717 | struct inode *inode = d_inode(dentry); |
237fead6 MH |
718 | struct ecryptfs_crypt_stat *crypt_stat; |
719 | loff_t i_size = i_size_read(inode); | |
720 | loff_t lower_size_before_truncate; | |
721 | loff_t lower_size_after_truncate; | |
722 | ||
5f3ef64f TH |
723 | if (unlikely((ia->ia_size == i_size))) { |
724 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 725 | return 0; |
5f3ef64f | 726 | } |
3b06b3eb | 727 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
728 | if (rc) |
729 | return rc; | |
2b0143b5 | 730 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
237fead6 | 731 | /* Switch on growing or shrinking file */ |
5f3ef64f | 732 | if (ia->ia_size > i_size) { |
2ed92554 MH |
733 | char zero[] = { 0x00 }; |
734 | ||
5f3ef64f | 735 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
736 | /* Write a single 0 at the last position of the file; |
737 | * this triggers code that will fill in 0's throughout | |
738 | * the intermediate portion of the previous end of the | |
739 | * file and the new and of the file */ | |
48c1e44a | 740 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
741 | (ia->ia_size - 1), 1); |
742 | } else { /* ia->ia_size < i_size_read(inode) */ | |
743 | /* We're chopping off all the pages down to the page | |
744 | * in which ia->ia_size is located. Fill in the end of | |
ea1754a0 KS |
745 | * that page from (ia->ia_size & ~PAGE_MASK) to |
746 | * PAGE_SIZE with zeros. */ | |
09cbfeaf KS |
747 | size_t num_zeros = (PAGE_SIZE |
748 | - (ia->ia_size & ~PAGE_MASK)); | |
2ed92554 | 749 | |
13a791b4 | 750 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 751 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
752 | lower_ia->ia_size = ia->ia_size; |
753 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 754 | goto out; |
13a791b4 | 755 | } |
2ed92554 MH |
756 | if (num_zeros) { |
757 | char *zeros_virt; | |
758 | ||
759 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
760 | if (!zeros_virt) { | |
761 | rc = -ENOMEM; | |
48c1e44a | 762 | goto out; |
2ed92554 | 763 | } |
48c1e44a | 764 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 765 | ia->ia_size, num_zeros); |
2ed92554 | 766 | kfree(zeros_virt); |
5dda6992 | 767 | if (rc) { |
240e2df5 MH |
768 | printk(KERN_ERR "Error attempting to zero out " |
769 | "the remainder of the end page on " | |
770 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 771 | goto out; |
240e2df5 MH |
772 | } |
773 | } | |
2c27c65e | 774 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 775 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
776 | if (rc) { |
777 | printk(KERN_ERR "Problem with " | |
778 | "ecryptfs_write_inode_size_to_metadata; " | |
779 | "rc = [%d]\n", rc); | |
48c1e44a | 780 | goto out; |
dd2a3b7a | 781 | } |
237fead6 MH |
782 | /* We are reducing the size of the ecryptfs file, and need to |
783 | * know if we need to reduce the size of the lower file. */ | |
784 | lower_size_before_truncate = | |
785 | upper_size_to_lower_size(crypt_stat, i_size); | |
786 | lower_size_after_truncate = | |
5f3ef64f TH |
787 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
788 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
789 | lower_ia->ia_size = lower_size_after_truncate; | |
790 | lower_ia->ia_valid |= ATTR_SIZE; | |
791 | } else | |
792 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 793 | } |
237fead6 | 794 | out: |
332ab16f | 795 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
796 | return rc; |
797 | } | |
798 | ||
a261a039 TH |
799 | static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) |
800 | { | |
801 | struct ecryptfs_crypt_stat *crypt_stat; | |
802 | loff_t lower_oldsize, lower_newsize; | |
803 | ||
804 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
805 | lower_oldsize = upper_size_to_lower_size(crypt_stat, | |
806 | i_size_read(inode)); | |
807 | lower_newsize = upper_size_to_lower_size(crypt_stat, offset); | |
808 | if (lower_newsize > lower_oldsize) { | |
809 | /* | |
810 | * The eCryptfs inode and the new *lower* size are mixed here | |
811 | * because we may not have the lower i_mutex held and/or it may | |
812 | * not be appropriate to call inode_newsize_ok() with inodes | |
813 | * from other filesystems. | |
814 | */ | |
815 | return inode_newsize_ok(inode, lower_newsize); | |
816 | } | |
817 | ||
818 | return 0; | |
819 | } | |
820 | ||
5f3ef64f TH |
821 | /** |
822 | * ecryptfs_truncate | |
823 | * @dentry: The ecryptfs layer dentry | |
824 | * @new_length: The length to expand the file to | |
825 | * | |
826 | * Simple function that handles the truncation of an eCryptfs inode and | |
827 | * its corresponding lower inode. | |
828 | * | |
829 | * Returns zero on success; non-zero otherwise | |
830 | */ | |
831 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
832 | { | |
833 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
834 | struct iattr lower_ia = { .ia_valid = 0 }; | |
835 | int rc; | |
836 | ||
2b0143b5 | 837 | rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); |
a261a039 TH |
838 | if (rc) |
839 | return rc; | |
840 | ||
5f3ef64f TH |
841 | rc = truncate_upper(dentry, &ia, &lower_ia); |
842 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
843 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
844 | ||
5955102c | 845 | inode_lock(d_inode(lower_dentry)); |
27ac0ffe | 846 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
5955102c | 847 | inode_unlock(d_inode(lower_dentry)); |
5f3ef64f TH |
848 | } |
849 | return rc; | |
850 | } | |
851 | ||
237fead6 | 852 | static int |
10556cb2 | 853 | ecryptfs_permission(struct inode *inode, int mask) |
237fead6 | 854 | { |
f419a2e3 | 855 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
856 | } |
857 | ||
858 | /** | |
859 | * ecryptfs_setattr | |
860 | * @dentry: dentry handle to the inode to modify | |
861 | * @ia: Structure with flags of what to change and values | |
862 | * | |
863 | * Updates the metadata of an inode. If the update is to the size | |
864 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
865 | * of both the ecryptfs inode and the lower inode. | |
866 | * | |
867 | * All other metadata changes will be passed right to the lower filesystem, | |
868 | * and we will just update our inode to look like the lower. | |
869 | */ | |
870 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
871 | { | |
872 | int rc = 0; | |
873 | struct dentry *lower_dentry; | |
5f3ef64f | 874 | struct iattr lower_ia; |
237fead6 MH |
875 | struct inode *inode; |
876 | struct inode *lower_inode; | |
877 | struct ecryptfs_crypt_stat *crypt_stat; | |
878 | ||
2b0143b5 | 879 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
e81f3340 HX |
880 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { |
881 | rc = ecryptfs_init_crypt_stat(crypt_stat); | |
882 | if (rc) | |
883 | return rc; | |
884 | } | |
2b0143b5 | 885 | inode = d_inode(dentry); |
237fead6 | 886 | lower_inode = ecryptfs_inode_to_lower(inode); |
e10f281b MH |
887 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
888 | mutex_lock(&crypt_stat->cs_mutex); | |
e36cb0b8 | 889 | if (d_is_dir(dentry)) |
e10f281b | 890 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
e36cb0b8 | 891 | else if (d_is_reg(dentry) |
64ee4808 MH |
892 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) |
893 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 894 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 895 | |
e10f281b MH |
896 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
897 | dentry->d_sb)->mount_crypt_stat; | |
3b06b3eb | 898 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
899 | if (rc) { |
900 | mutex_unlock(&crypt_stat->cs_mutex); | |
901 | goto out; | |
902 | } | |
d7cdc5fe | 903 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 904 | ecryptfs_put_lower_file(inode); |
5dda6992 | 905 | if (rc) { |
e10f281b MH |
906 | if (!(mount_crypt_stat->flags |
907 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
908 | rc = -EIO; | |
25bd8174 | 909 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 910 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
911 | "or the key could not be retrieved. " |
912 | "Plaintext passthrough mode is not " | |
e10f281b | 913 | "enabled; returning -EIO\n"); |
e10f281b | 914 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
915 | goto out; |
916 | } | |
917 | rc = 0; | |
3aeb86ea TH |
918 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
919 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 920 | } |
e10f281b MH |
921 | } |
922 | mutex_unlock(&crypt_stat->cs_mutex); | |
a261a039 | 923 | |
31051c85 | 924 | rc = setattr_prepare(dentry, ia); |
a261a039 TH |
925 | if (rc) |
926 | goto out; | |
927 | if (ia->ia_valid & ATTR_SIZE) { | |
928 | rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); | |
929 | if (rc) | |
930 | goto out; | |
931 | } | |
932 | ||
5f3ef64f TH |
933 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
934 | if (ia->ia_valid & ATTR_FILE) | |
935 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 936 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 937 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
938 | if (rc < 0) |
939 | goto out; | |
940 | } | |
1ac564ec JL |
941 | |
942 | /* | |
943 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
944 | * to interpret this in its own way. | |
945 | */ | |
5f3ef64f TH |
946 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
947 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 948 | |
5955102c | 949 | inode_lock(d_inode(lower_dentry)); |
27ac0ffe | 950 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
5955102c | 951 | inode_unlock(d_inode(lower_dentry)); |
237fead6 | 952 | out: |
9afa2fb6 | 953 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
954 | return rc; |
955 | } | |
956 | ||
a528d35e DH |
957 | static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat, |
958 | u32 request_mask, unsigned int flags) | |
3a60a168 | 959 | { |
a528d35e | 960 | struct dentry *dentry = path->dentry; |
3a60a168 TH |
961 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
962 | int rc = 0; | |
963 | ||
964 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
965 | dentry->d_sb)->mount_crypt_stat; | |
2b0143b5 | 966 | generic_fillattr(d_inode(dentry), stat); |
3a60a168 TH |
967 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
968 | char *target; | |
969 | size_t targetsiz; | |
970 | ||
b22e8fed AV |
971 | target = ecryptfs_readlink_lower(dentry, &targetsiz); |
972 | if (!IS_ERR(target)) { | |
3a60a168 TH |
973 | kfree(target); |
974 | stat->size = targetsiz; | |
b22e8fed AV |
975 | } else { |
976 | rc = PTR_ERR(target); | |
3a60a168 TH |
977 | } |
978 | } | |
979 | return rc; | |
980 | } | |
981 | ||
a528d35e DH |
982 | static int ecryptfs_getattr(const struct path *path, struct kstat *stat, |
983 | u32 request_mask, unsigned int flags) | |
f8f484d1 | 984 | { |
a528d35e | 985 | struct dentry *dentry = path->dentry; |
f8f484d1 TH |
986 | struct kstat lower_stat; |
987 | int rc; | |
988 | ||
a528d35e DH |
989 | rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat, |
990 | request_mask, flags); | |
f8f484d1 | 991 | if (!rc) { |
2b0143b5 DH |
992 | fsstack_copy_attr_all(d_inode(dentry), |
993 | ecryptfs_inode_to_lower(d_inode(dentry))); | |
994 | generic_fillattr(d_inode(dentry), stat); | |
f8f484d1 TH |
995 | stat->blocks = lower_stat.blocks; |
996 | } | |
997 | return rc; | |
998 | } | |
999 | ||
dd2a3b7a | 1000 | int |
3767e255 AV |
1001 | ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, |
1002 | const char *name, const void *value, | |
237fead6 MH |
1003 | size_t size, int flags) |
1004 | { | |
5d6c3191 | 1005 | int rc; |
237fead6 MH |
1006 | struct dentry *lower_dentry; |
1007 | ||
1008 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
5d6c3191 | 1009 | if (!(d_inode(lower_dentry)->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1010 | rc = -EOPNOTSUPP; |
237fead6 MH |
1011 | goto out; |
1012 | } | |
48b512e6 | 1013 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); |
3767e255 AV |
1014 | if (!rc && inode) |
1015 | fsstack_copy_attr_all(inode, d_inode(lower_dentry)); | |
237fead6 MH |
1016 | out: |
1017 | return rc; | |
1018 | } | |
1019 | ||
d7cdc5fe | 1020 | ssize_t |
ce23e640 AV |
1021 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, |
1022 | const char *name, void *value, size_t size) | |
d7cdc5fe | 1023 | { |
5d6c3191 | 1024 | int rc; |
d7cdc5fe | 1025 | |
5d6c3191 | 1026 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1027 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1028 | goto out; |
1029 | } | |
ce23e640 | 1030 | inode_lock(lower_inode); |
5d6c3191 | 1031 | rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size); |
ce23e640 | 1032 | inode_unlock(lower_inode); |
d7cdc5fe MH |
1033 | out: |
1034 | return rc; | |
1035 | } | |
1036 | ||
7896b631 | 1037 | static ssize_t |
ce23e640 AV |
1038 | ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, |
1039 | const char *name, void *value, size_t size) | |
237fead6 | 1040 | { |
ce23e640 AV |
1041 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), |
1042 | ecryptfs_inode_to_lower(inode), | |
1043 | name, value, size); | |
237fead6 MH |
1044 | } |
1045 | ||
1046 | static ssize_t | |
1047 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1048 | { | |
1049 | int rc = 0; | |
1050 | struct dentry *lower_dentry; | |
1051 | ||
1052 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2b0143b5 | 1053 | if (!d_inode(lower_dentry)->i_op->listxattr) { |
cfce08c6 | 1054 | rc = -EOPNOTSUPP; |
237fead6 MH |
1055 | goto out; |
1056 | } | |
5955102c | 1057 | inode_lock(d_inode(lower_dentry)); |
2b0143b5 | 1058 | rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); |
5955102c | 1059 | inode_unlock(d_inode(lower_dentry)); |
237fead6 MH |
1060 | out: |
1061 | return rc; | |
1062 | } | |
1063 | ||
4b899da5 AG |
1064 | static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, |
1065 | const char *name) | |
237fead6 | 1066 | { |
5d6c3191 | 1067 | int rc; |
237fead6 | 1068 | struct dentry *lower_dentry; |
4b899da5 | 1069 | struct inode *lower_inode; |
237fead6 MH |
1070 | |
1071 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
4b899da5 | 1072 | lower_inode = ecryptfs_inode_to_lower(inode); |
5d6c3191 | 1073 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1074 | rc = -EOPNOTSUPP; |
237fead6 MH |
1075 | goto out; |
1076 | } | |
4b899da5 | 1077 | inode_lock(lower_inode); |
5d6c3191 | 1078 | rc = __vfs_removexattr(lower_dentry, name); |
4b899da5 | 1079 | inode_unlock(lower_inode); |
237fead6 MH |
1080 | out: |
1081 | return rc; | |
1082 | } | |
1083 | ||
754661f1 | 1084 | const struct inode_operations ecryptfs_symlink_iops = { |
6b255391 | 1085 | .get_link = ecryptfs_get_link, |
237fead6 MH |
1086 | .permission = ecryptfs_permission, |
1087 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1088 | .getattr = ecryptfs_getattr_link, |
237fead6 | 1089 | .listxattr = ecryptfs_listxattr, |
237fead6 MH |
1090 | }; |
1091 | ||
754661f1 | 1092 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1093 | .create = ecryptfs_create, |
1094 | .lookup = ecryptfs_lookup, | |
1095 | .link = ecryptfs_link, | |
1096 | .unlink = ecryptfs_unlink, | |
1097 | .symlink = ecryptfs_symlink, | |
1098 | .mkdir = ecryptfs_mkdir, | |
1099 | .rmdir = ecryptfs_rmdir, | |
1100 | .mknod = ecryptfs_mknod, | |
1101 | .rename = ecryptfs_rename, | |
1102 | .permission = ecryptfs_permission, | |
1103 | .setattr = ecryptfs_setattr, | |
237fead6 | 1104 | .listxattr = ecryptfs_listxattr, |
237fead6 MH |
1105 | }; |
1106 | ||
754661f1 | 1107 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1108 | .permission = ecryptfs_permission, |
1109 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1110 | .getattr = ecryptfs_getattr, |
237fead6 | 1111 | .listxattr = ecryptfs_listxattr, |
4b899da5 AG |
1112 | }; |
1113 | ||
1114 | static int ecryptfs_xattr_get(const struct xattr_handler *handler, | |
1115 | struct dentry *dentry, struct inode *inode, | |
1116 | const char *name, void *buffer, size_t size) | |
1117 | { | |
1118 | return ecryptfs_getxattr(dentry, inode, name, buffer, size); | |
1119 | } | |
1120 | ||
1121 | static int ecryptfs_xattr_set(const struct xattr_handler *handler, | |
1122 | struct dentry *dentry, struct inode *inode, | |
1123 | const char *name, const void *value, size_t size, | |
1124 | int flags) | |
1125 | { | |
1126 | if (value) | |
1127 | return ecryptfs_setxattr(dentry, inode, name, value, size, flags); | |
1128 | else { | |
1129 | BUG_ON(flags != XATTR_REPLACE); | |
1130 | return ecryptfs_removexattr(dentry, inode, name); | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | const struct xattr_handler ecryptfs_xattr_handler = { | |
1135 | .prefix = "", /* match anything */ | |
1136 | .get = ecryptfs_xattr_get, | |
1137 | .set = ecryptfs_xattr_set, | |
1138 | }; | |
1139 | ||
1140 | const struct xattr_handler *ecryptfs_xattr_handlers[] = { | |
1141 | &ecryptfs_xattr_handler, | |
1142 | NULL | |
237fead6 | 1143 | }; |