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_version++; |
c4f79073 | 68 | inode->i_mapping->a_ops = &ecryptfs_aops; |
5ccf9203 TH |
69 | |
70 | if (S_ISLNK(inode->i_mode)) | |
71 | inode->i_op = &ecryptfs_symlink_iops; | |
72 | else if (S_ISDIR(inode->i_mode)) | |
73 | inode->i_op = &ecryptfs_dir_iops; | |
74 | else | |
75 | inode->i_op = &ecryptfs_main_iops; | |
76 | ||
77 | if (S_ISDIR(inode->i_mode)) | |
78 | inode->i_fop = &ecryptfs_dir_fops; | |
79 | else if (special_file(inode->i_mode)) | |
80 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
81 | else | |
82 | inode->i_fop = &ecryptfs_main_fops; | |
83 | ||
c4f79073 TH |
84 | return 0; |
85 | } | |
86 | ||
5ccf9203 TH |
87 | static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, |
88 | struct super_block *sb) | |
c4f79073 TH |
89 | { |
90 | struct inode *inode; | |
c4f79073 | 91 | |
5ccf9203 TH |
92 | if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) |
93 | return ERR_PTR(-EXDEV); | |
94 | if (!igrab(lower_inode)) | |
95 | return ERR_PTR(-ESTALE); | |
c4f79073 TH |
96 | inode = iget5_locked(sb, (unsigned long)lower_inode, |
97 | ecryptfs_inode_test, ecryptfs_inode_set, | |
98 | lower_inode); | |
99 | if (!inode) { | |
c4f79073 | 100 | iput(lower_inode); |
5ccf9203 | 101 | return ERR_PTR(-EACCES); |
c4f79073 | 102 | } |
5ccf9203 | 103 | if (!(inode->i_state & I_NEW)) |
c4f79073 | 104 | iput(lower_inode); |
5ccf9203 TH |
105 | |
106 | return inode; | |
107 | } | |
108 | ||
109 | struct inode *ecryptfs_get_inode(struct inode *lower_inode, | |
110 | struct super_block *sb) | |
111 | { | |
112 | struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); | |
113 | ||
114 | if (!IS_ERR(inode) && (inode->i_state & I_NEW)) | |
115 | unlock_new_inode(inode); | |
116 | ||
c4f79073 | 117 | return inode; |
c4f79073 TH |
118 | } |
119 | ||
c4f79073 TH |
120 | /** |
121 | * ecryptfs_interpose | |
122 | * @lower_dentry: Existing dentry in the lower filesystem | |
123 | * @dentry: ecryptfs' dentry | |
124 | * @sb: ecryptfs's super_block | |
c4f79073 TH |
125 | * |
126 | * Interposes upper and lower dentries. | |
127 | * | |
128 | * Returns zero on success; non-zero otherwise | |
129 | */ | |
130 | static int ecryptfs_interpose(struct dentry *lower_dentry, | |
5ccf9203 | 131 | struct dentry *dentry, struct super_block *sb) |
c4f79073 | 132 | { |
2b0143b5 | 133 | struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); |
5ccf9203 | 134 | |
c4f79073 TH |
135 | if (IS_ERR(inode)) |
136 | return PTR_ERR(inode); | |
5ccf9203 TH |
137 | d_instantiate(dentry, inode); |
138 | ||
c4f79073 TH |
139 | return 0; |
140 | } | |
141 | ||
8bc2d3cf TH |
142 | static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, |
143 | struct inode *inode) | |
144 | { | |
145 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
146 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
147 | struct dentry *lower_dir_dentry; | |
148 | int rc; | |
149 | ||
150 | dget(lower_dentry); | |
151 | lower_dir_dentry = lock_parent(lower_dentry); | |
b21996e3 | 152 | rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); |
8bc2d3cf TH |
153 | if (rc) { |
154 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); | |
155 | goto out_unlock; | |
156 | } | |
157 | fsstack_copy_attr_times(dir, lower_dir_inode); | |
158 | set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); | |
159 | inode->i_ctime = dir->i_ctime; | |
160 | d_drop(dentry); | |
161 | out_unlock: | |
162 | unlock_dir(lower_dir_dentry); | |
163 | dput(lower_dentry); | |
164 | return rc; | |
165 | } | |
166 | ||
237fead6 MH |
167 | /** |
168 | * ecryptfs_do_create | |
169 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
170 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
171 | * @mode: The mode of the new file | |
237fead6 MH |
172 | * |
173 | * Creates the underlying file and the eCryptfs inode which will link to | |
174 | * it. It will also update the eCryptfs directory inode to mimic the | |
175 | * stat of the lower directory inode. | |
176 | * | |
b59db43a | 177 | * Returns the new eCryptfs inode on success; an ERR_PTR on error condition |
237fead6 | 178 | */ |
b59db43a | 179 | static struct inode * |
237fead6 | 180 | ecryptfs_do_create(struct inode *directory_inode, |
175a4eb7 | 181 | struct dentry *ecryptfs_dentry, umode_t mode) |
237fead6 MH |
182 | { |
183 | int rc; | |
184 | struct dentry *lower_dentry; | |
185 | struct dentry *lower_dir_dentry; | |
b59db43a | 186 | struct inode *inode; |
237fead6 MH |
187 | |
188 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
189 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 | 190 | rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true); |
4981e081 | 191 | if (rc) { |
caeeeecf | 192 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 193 | "rc = [%d]\n", __func__, rc); |
b59db43a | 194 | inode = ERR_PTR(rc); |
caeeeecf | 195 | goto out_lock; |
237fead6 | 196 | } |
2b0143b5 | 197 | inode = __ecryptfs_get_inode(d_inode(lower_dentry), |
b59db43a | 198 | directory_inode->i_sb); |
8bc2d3cf | 199 | if (IS_ERR(inode)) { |
2b0143b5 | 200 | vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL); |
237fead6 | 201 | goto out_lock; |
8bc2d3cf | 202 | } |
2b0143b5 DH |
203 | fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); |
204 | fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); | |
237fead6 MH |
205 | out_lock: |
206 | unlock_dir(lower_dir_dentry); | |
b59db43a | 207 | return inode; |
237fead6 MH |
208 | } |
209 | ||
237fead6 MH |
210 | /** |
211 | * ecryptfs_initialize_file | |
212 | * | |
213 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
214 | * file with a header and first data page. | |
215 | * | |
216 | * Returns zero on success | |
217 | */ | |
e3ccaa97 TH |
218 | int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, |
219 | struct inode *ecryptfs_inode) | |
237fead6 | 220 | { |
d7cdc5fe | 221 | struct ecryptfs_crypt_stat *crypt_stat = |
b59db43a | 222 | &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; |
237fead6 | 223 | int rc = 0; |
237fead6 | 224 | |
b59db43a | 225 | if (S_ISDIR(ecryptfs_inode->i_mode)) { |
237fead6 | 226 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); |
e2bd99ec | 227 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 228 | goto out; |
237fead6 | 229 | } |
237fead6 | 230 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
b59db43a | 231 | rc = ecryptfs_new_file_context(ecryptfs_inode); |
237fead6 | 232 | if (rc) { |
d7cdc5fe MH |
233 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
234 | "context; rc = [%d]\n", rc); | |
235 | goto out; | |
237fead6 | 236 | } |
b59db43a | 237 | rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); |
27992890 RS |
238 | if (rc) { |
239 | printk(KERN_ERR "%s: Error attempting to initialize " | |
332ab16f | 240 | "the lower file for the dentry with name " |
9e78d14a DH |
241 | "[%pd]; rc = [%d]\n", __func__, |
242 | ecryptfs_dentry, rc); | |
27992890 | 243 | goto out; |
391b52f9 | 244 | } |
b59db43a | 245 | rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); |
332ab16f | 246 | if (rc) |
d7cdc5fe | 247 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
b59db43a | 248 | ecryptfs_put_lower_file(ecryptfs_inode); |
237fead6 MH |
249 | out: |
250 | return rc; | |
251 | } | |
252 | ||
253 | /** | |
254 | * ecryptfs_create | |
255 | * @dir: The inode of the directory in which to create the file. | |
256 | * @dentry: The eCryptfs dentry | |
257 | * @mode: The mode of the new file. | |
237fead6 MH |
258 | * |
259 | * Creates a new file. | |
260 | * | |
261 | * Returns zero on success; non-zero on error condition | |
262 | */ | |
263 | static int | |
264 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
ebfc3b49 | 265 | umode_t mode, bool excl) |
237fead6 | 266 | { |
b59db43a | 267 | struct inode *ecryptfs_inode; |
237fead6 MH |
268 | int rc; |
269 | ||
b59db43a TH |
270 | ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, |
271 | mode); | |
a1c83681 | 272 | if (IS_ERR(ecryptfs_inode)) { |
237fead6 MH |
273 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
274 | "lower filesystem\n"); | |
b59db43a | 275 | rc = PTR_ERR(ecryptfs_inode); |
237fead6 MH |
276 | goto out; |
277 | } | |
278 | /* At this point, a file exists on "disk"; we need to make sure | |
279 | * that this on disk file is prepared to be an ecryptfs file */ | |
b59db43a TH |
280 | rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); |
281 | if (rc) { | |
8bc2d3cf TH |
282 | ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, |
283 | ecryptfs_inode); | |
0e81ba23 | 284 | iget_failed(ecryptfs_inode); |
b59db43a TH |
285 | goto out; |
286 | } | |
b59db43a | 287 | unlock_new_inode(ecryptfs_inode); |
8fc37ec5 | 288 | d_instantiate(ecryptfs_dentry, ecryptfs_inode); |
237fead6 MH |
289 | out: |
290 | return rc; | |
291 | } | |
292 | ||
778aeb42 TH |
293 | static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) |
294 | { | |
295 | struct ecryptfs_crypt_stat *crypt_stat; | |
296 | int rc; | |
297 | ||
298 | rc = ecryptfs_get_lower_file(dentry, inode); | |
299 | if (rc) { | |
300 | printk(KERN_ERR "%s: Error attempting to initialize " | |
301 | "the lower file for the dentry with name " | |
9e78d14a DH |
302 | "[%pd]; rc = [%d]\n", __func__, |
303 | dentry, rc); | |
778aeb42 TH |
304 | return rc; |
305 | } | |
306 | ||
307 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
308 | /* TODO: lock for crypt_stat comparison */ | |
309 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
310 | ecryptfs_set_default_sizes(crypt_stat); | |
311 | ||
312 | rc = ecryptfs_read_and_validate_header_region(inode); | |
313 | ecryptfs_put_lower_file(inode); | |
314 | if (rc) { | |
315 | rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); | |
316 | if (!rc) | |
317 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; | |
318 | } | |
319 | ||
320 | /* Must return 0 to allow non-eCryptfs files to be looked up, too */ | |
321 | return 0; | |
322 | } | |
323 | ||
237fead6 | 324 | /** |
5ccf9203 | 325 | * ecryptfs_lookup_interpose - Dentry interposition for a lookup |
237fead6 | 326 | */ |
778aeb42 | 327 | static int ecryptfs_lookup_interpose(struct dentry *dentry, |
5ccf9203 | 328 | struct dentry *lower_dentry, |
778aeb42 | 329 | struct inode *dir_inode) |
237fead6 | 330 | { |
2b0143b5 | 331 | struct inode *inode, *lower_inode = d_inode(lower_dentry); |
778aeb42 | 332 | struct ecryptfs_dentry_info *dentry_info; |
237fead6 | 333 | struct vfsmount *lower_mnt; |
778aeb42 TH |
334 | int rc = 0; |
335 | ||
778aeb42 | 336 | dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); |
778aeb42 | 337 | if (!dentry_info) { |
addd65ad MH |
338 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
339 | "to allocate ecryptfs_dentry_info struct\n", | |
340 | __func__); | |
778aeb42 | 341 | dput(lower_dentry); |
778aeb42 | 342 | return -ENOMEM; |
237fead6 | 343 | } |
0b1d9011 AV |
344 | |
345 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); | |
2b0143b5 | 346 | fsstack_copy_attr_atime(dir_inode, d_inode(lower_dentry->d_parent)); |
84d08fa8 | 347 | BUG_ON(!d_count(lower_dentry)); |
0b1d9011 AV |
348 | |
349 | ecryptfs_set_dentry_private(dentry, dentry_info); | |
92dd1230 AV |
350 | dentry_info->lower_path.mnt = lower_mnt; |
351 | dentry_info->lower_path.dentry = lower_dentry; | |
778aeb42 | 352 | |
2b0143b5 | 353 | if (d_really_is_negative(lower_dentry)) { |
237fead6 | 354 | /* We want to add because we couldn't find in lower */ |
778aeb42 TH |
355 | d_add(dentry, NULL); |
356 | return 0; | |
237fead6 | 357 | } |
778aeb42 | 358 | inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); |
5ccf9203 | 359 | if (IS_ERR(inode)) { |
778aeb42 TH |
360 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", |
361 | __func__, PTR_ERR(inode)); | |
362 | return PTR_ERR(inode); | |
391b52f9 | 363 | } |
778aeb42 TH |
364 | if (S_ISREG(inode->i_mode)) { |
365 | rc = ecryptfs_i_size_read(dentry, inode); | |
dd2a3b7a | 366 | if (rc) { |
778aeb42 TH |
367 | make_bad_inode(inode); |
368 | return rc; | |
237fead6 | 369 | } |
237fead6 | 370 | } |
778aeb42 | 371 | |
3b06b3eb TH |
372 | if (inode->i_state & I_NEW) |
373 | unlock_new_inode(inode); | |
778aeb42 TH |
374 | d_add(dentry, inode); |
375 | ||
addd65ad MH |
376 | return rc; |
377 | } | |
378 | ||
379 | /** | |
380 | * ecryptfs_lookup | |
381 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
382 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
89076bc3 | 383 | * @flags: lookup flags |
addd65ad MH |
384 | * |
385 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
386 | * dentry cache and continue on to read it from the disk. | |
387 | */ | |
388 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
389 | struct dentry *ecryptfs_dentry, | |
00cd8dd3 | 390 | unsigned int flags) |
addd65ad MH |
391 | { |
392 | char *encrypted_and_encoded_name = NULL; | |
a8f12864 | 393 | size_t encrypted_and_encoded_name_size; |
addd65ad | 394 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
addd65ad MH |
395 | struct dentry *lower_dir_dentry, *lower_dentry; |
396 | int rc = 0; | |
397 | ||
addd65ad | 398 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); |
5955102c | 399 | inode_lock(d_inode(lower_dir_dentry)); |
8787c7a3 TH |
400 | lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, |
401 | lower_dir_dentry, | |
402 | ecryptfs_dentry->d_name.len); | |
5955102c | 403 | inode_unlock(d_inode(lower_dir_dentry)); |
addd65ad MH |
404 | if (IS_ERR(lower_dentry)) { |
405 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 406 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9e78d14a DH |
407 | "[%d] on lower_dentry = [%pd]\n", __func__, rc, |
408 | ecryptfs_dentry); | |
bc65a121 | 409 | goto out; |
addd65ad | 410 | } |
2b0143b5 | 411 | if (d_really_is_positive(lower_dentry)) |
5ccf9203 | 412 | goto interpose; |
2aac0cf8 TH |
413 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
414 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
415 | if (!(mount_crypt_stat | |
416 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) | |
5ccf9203 | 417 | goto interpose; |
addd65ad MH |
418 | dput(lower_dentry); |
419 | rc = ecryptfs_encrypt_and_encode_filename( | |
420 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, | |
2aac0cf8 | 421 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
addd65ad MH |
422 | ecryptfs_dentry->d_name.len); |
423 | if (rc) { | |
424 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
425 | "filename; rc = [%d]\n", __func__, rc); | |
bc65a121 | 426 | goto out; |
addd65ad | 427 | } |
5955102c | 428 | inode_lock(d_inode(lower_dir_dentry)); |
8787c7a3 TH |
429 | lower_dentry = lookup_one_len(encrypted_and_encoded_name, |
430 | lower_dir_dentry, | |
431 | encrypted_and_encoded_name_size); | |
5955102c | 432 | inode_unlock(d_inode(lower_dir_dentry)); |
addd65ad MH |
433 | if (IS_ERR(lower_dentry)) { |
434 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 435 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
436 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
437 | encrypted_and_encoded_name); | |
bc65a121 | 438 | goto out; |
addd65ad | 439 | } |
5ccf9203 TH |
440 | interpose: |
441 | rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, | |
442 | ecryptfs_dir_inode); | |
237fead6 | 443 | out: |
addd65ad | 444 | kfree(encrypted_and_encoded_name); |
237fead6 MH |
445 | return ERR_PTR(rc); |
446 | } | |
447 | ||
448 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
449 | struct dentry *new_dentry) | |
450 | { | |
451 | struct dentry *lower_old_dentry; | |
452 | struct dentry *lower_new_dentry; | |
453 | struct dentry *lower_dir_dentry; | |
454 | u64 file_size_save; | |
455 | int rc; | |
456 | ||
2b0143b5 | 457 | file_size_save = i_size_read(d_inode(old_dentry)); |
237fead6 MH |
458 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
459 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
460 | dget(lower_old_dentry); | |
461 | dget(lower_new_dentry); | |
462 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
2b0143b5 | 463 | rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), |
146a8595 | 464 | lower_new_dentry, NULL); |
2b0143b5 | 465 | if (rc || d_really_is_negative(lower_new_dentry)) |
237fead6 | 466 | goto out_lock; |
5ccf9203 | 467 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
237fead6 MH |
468 | if (rc) |
469 | goto out_lock; | |
2b0143b5 DH |
470 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
471 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
472 | set_nlink(d_inode(old_dentry), | |
473 | ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); | |
474 | i_size_write(d_inode(new_dentry), file_size_save); | |
237fead6 MH |
475 | out_lock: |
476 | unlock_dir(lower_dir_dentry); | |
477 | dput(lower_new_dentry); | |
478 | dput(lower_old_dentry); | |
237fead6 MH |
479 | return rc; |
480 | } | |
481 | ||
482 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
483 | { | |
2b0143b5 | 484 | return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); |
237fead6 MH |
485 | } |
486 | ||
487 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
488 | const char *symname) | |
489 | { | |
490 | int rc; | |
491 | struct dentry *lower_dentry; | |
492 | struct dentry *lower_dir_dentry; | |
237fead6 | 493 | char *encoded_symname; |
addd65ad MH |
494 | size_t encoded_symlen; |
495 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
496 | |
497 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
498 | dget(lower_dentry); | |
499 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
500 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
501 | dir->i_sb)->mount_crypt_stat; | |
502 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
503 | &encoded_symlen, | |
504 | NULL, | |
505 | mount_crypt_stat, symname, | |
506 | strlen(symname)); | |
507 | if (rc) | |
237fead6 | 508 | goto out_lock; |
2b0143b5 | 509 | rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry, |
db2e747b | 510 | encoded_symname); |
237fead6 | 511 | kfree(encoded_symname); |
2b0143b5 | 512 | if (rc || d_really_is_negative(lower_dentry)) |
237fead6 | 513 | goto out_lock; |
5ccf9203 | 514 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
515 | if (rc) |
516 | goto out_lock; | |
2b0143b5 DH |
517 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
518 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
237fead6 MH |
519 | out_lock: |
520 | unlock_dir(lower_dir_dentry); | |
521 | dput(lower_dentry); | |
2b0143b5 | 522 | if (d_really_is_negative(dentry)) |
237fead6 MH |
523 | d_drop(dentry); |
524 | return rc; | |
525 | } | |
526 | ||
18bb1db3 | 527 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
237fead6 MH |
528 | { |
529 | int rc; | |
530 | struct dentry *lower_dentry; | |
531 | struct dentry *lower_dir_dentry; | |
532 | ||
533 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
534 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 DH |
535 | rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode); |
536 | if (rc || d_really_is_negative(lower_dentry)) | |
237fead6 | 537 | goto out; |
5ccf9203 | 538 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
539 | if (rc) |
540 | goto out; | |
2b0143b5 DH |
541 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
542 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
543 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); | |
237fead6 MH |
544 | out: |
545 | unlock_dir(lower_dir_dentry); | |
2b0143b5 | 546 | if (d_really_is_negative(dentry)) |
237fead6 MH |
547 | d_drop(dentry); |
548 | return rc; | |
549 | } | |
550 | ||
551 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
552 | { | |
237fead6 | 553 | struct dentry *lower_dentry; |
237fead6 | 554 | struct dentry *lower_dir_dentry; |
45ec4aba | 555 | int rc; |
237fead6 MH |
556 | |
557 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 558 | dget(dentry); |
237fead6 | 559 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 560 | dget(lower_dentry); |
2b0143b5 | 561 | rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry); |
45ec4aba | 562 | dput(lower_dentry); |
2b0143b5 DH |
563 | if (!rc && d_really_is_positive(dentry)) |
564 | clear_nlink(d_inode(dentry)); | |
565 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); | |
566 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); | |
237fead6 MH |
567 | unlock_dir(lower_dir_dentry); |
568 | if (!rc) | |
569 | d_drop(dentry); | |
45ec4aba | 570 | dput(dentry); |
237fead6 MH |
571 | return rc; |
572 | } | |
573 | ||
574 | static int | |
1a67aafb | 575 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
237fead6 MH |
576 | { |
577 | int rc; | |
578 | struct dentry *lower_dentry; | |
579 | struct dentry *lower_dir_dentry; | |
580 | ||
581 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
582 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 DH |
583 | rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev); |
584 | if (rc || d_really_is_negative(lower_dentry)) | |
237fead6 | 585 | goto out; |
5ccf9203 | 586 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
587 | if (rc) |
588 | goto out; | |
2b0143b5 DH |
589 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
590 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
237fead6 MH |
591 | out: |
592 | unlock_dir(lower_dir_dentry); | |
2b0143b5 | 593 | if (d_really_is_negative(dentry)) |
237fead6 MH |
594 | d_drop(dentry); |
595 | return rc; | |
596 | } | |
597 | ||
598 | static int | |
599 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
600 | struct inode *new_dir, struct dentry *new_dentry) | |
601 | { | |
602 | int rc; | |
603 | struct dentry *lower_old_dentry; | |
604 | struct dentry *lower_new_dentry; | |
605 | struct dentry *lower_old_dir_dentry; | |
606 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 607 | struct dentry *trap = NULL; |
8335eafc | 608 | struct inode *target_inode; |
237fead6 MH |
609 | |
610 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
611 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
612 | dget(lower_old_dentry); | |
613 | dget(lower_new_dentry); | |
614 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
615 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
2b0143b5 | 616 | target_inode = d_inode(new_dentry); |
0d132f73 EZ |
617 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
618 | /* source should not be ancestor of target */ | |
619 | if (trap == lower_old_dentry) { | |
620 | rc = -EINVAL; | |
621 | goto out_lock; | |
622 | } | |
623 | /* target should not be ancestor of source */ | |
624 | if (trap == lower_new_dentry) { | |
625 | rc = -ENOTEMPTY; | |
626 | goto out_lock; | |
627 | } | |
2b0143b5 DH |
628 | rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, |
629 | d_inode(lower_new_dir_dentry), lower_new_dentry, | |
520c8b16 | 630 | NULL, 0); |
237fead6 MH |
631 | if (rc) |
632 | goto out_lock; | |
8335eafc TH |
633 | if (target_inode) |
634 | fsstack_copy_attr_all(target_inode, | |
635 | ecryptfs_inode_to_lower(target_inode)); | |
2b0143b5 | 636 | fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); |
237fead6 | 637 | if (new_dir != old_dir) |
2b0143b5 | 638 | fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); |
237fead6 MH |
639 | out_lock: |
640 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
dd55c898 TH |
641 | dput(lower_new_dir_dentry); |
642 | dput(lower_old_dir_dentry); | |
237fead6 MH |
643 | dput(lower_new_dentry); |
644 | dput(lower_old_dentry); | |
645 | return rc; | |
646 | } | |
647 | ||
b22e8fed | 648 | static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) |
237fead6 | 649 | { |
3a60a168 | 650 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
237fead6 | 651 | char *lower_buf; |
b22e8fed | 652 | char *buf; |
addd65ad MH |
653 | mm_segment_t old_fs; |
654 | int rc; | |
237fead6 | 655 | |
408bd629 | 656 | lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); |
b22e8fed AV |
657 | if (!lower_buf) |
658 | return ERR_PTR(-ENOMEM); | |
237fead6 MH |
659 | old_fs = get_fs(); |
660 | set_fs(get_ds()); | |
2b0143b5 | 661 | rc = d_inode(lower_dentry)->i_op->readlink(lower_dentry, |
237fead6 | 662 | (char __user *)lower_buf, |
408bd629 | 663 | PATH_MAX); |
237fead6 | 664 | set_fs(old_fs); |
3a60a168 TH |
665 | if (rc < 0) |
666 | goto out; | |
b22e8fed | 667 | rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, |
408bd629 | 668 | lower_buf, rc); |
3a60a168 | 669 | out: |
237fead6 | 670 | kfree(lower_buf); |
b22e8fed | 671 | return rc ? ERR_PTR(rc) : buf; |
3a60a168 TH |
672 | } |
673 | ||
6b255391 | 674 | static const char *ecryptfs_get_link(struct dentry *dentry, |
fceef393 AV |
675 | struct inode *inode, |
676 | struct delayed_call *done) | |
3a60a168 | 677 | { |
b22e8fed | 678 | size_t len; |
6b255391 AV |
679 | char *buf; |
680 | ||
681 | if (!dentry) | |
682 | return ERR_PTR(-ECHILD); | |
683 | ||
684 | buf = ecryptfs_readlink_lower(dentry, &len); | |
b22e8fed | 685 | if (IS_ERR(buf)) |
680baacb | 686 | return buf; |
2b0143b5 DH |
687 | fsstack_copy_attr_atime(d_inode(dentry), |
688 | d_inode(ecryptfs_dentry_to_lower(dentry))); | |
408bd629 | 689 | buf[len] = '\0'; |
fceef393 AV |
690 | set_delayed_call(done, kfree_link, buf); |
691 | return buf; | |
237fead6 MH |
692 | } |
693 | ||
237fead6 MH |
694 | /** |
695 | * upper_size_to_lower_size | |
696 | * @crypt_stat: Crypt_stat associated with file | |
697 | * @upper_size: Size of the upper file | |
698 | * | |
cc11beff | 699 | * Calculate the required size of the lower file based on the |
237fead6 MH |
700 | * specified size of the upper file. This calculation is based on the |
701 | * number of headers in the underlying file and the extent size. | |
702 | * | |
703 | * Returns Calculated size of the lower file. | |
704 | */ | |
705 | static loff_t | |
706 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
707 | loff_t upper_size) | |
708 | { | |
709 | loff_t lower_size; | |
710 | ||
157f1071 | 711 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
712 | if (upper_size != 0) { |
713 | loff_t num_extents; | |
714 | ||
715 | num_extents = upper_size >> crypt_stat->extent_shift; | |
716 | if (upper_size & ~crypt_stat->extent_mask) | |
717 | num_extents++; | |
718 | lower_size += (num_extents * crypt_stat->extent_size); | |
719 | } | |
720 | return lower_size; | |
721 | } | |
722 | ||
723 | /** | |
5f3ef64f | 724 | * truncate_upper |
237fead6 | 725 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
726 | * @ia: Address of the ecryptfs inode's attributes |
727 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
728 | * |
729 | * Function to handle truncations modifying the size of the file. Note | |
730 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
731 | * writing strings of 0's out. When truncating, we truncate the upper |
732 | * inode and update the lower_ia according to the page index | |
733 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
734 | * the caller must use lower_ia in a call to notify_change() to perform | |
735 | * the truncation of the lower inode. | |
237fead6 MH |
736 | * |
737 | * Returns zero on success; non-zero otherwise | |
738 | */ | |
5f3ef64f TH |
739 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
740 | struct iattr *lower_ia) | |
237fead6 MH |
741 | { |
742 | int rc = 0; | |
2b0143b5 | 743 | struct inode *inode = d_inode(dentry); |
237fead6 MH |
744 | struct ecryptfs_crypt_stat *crypt_stat; |
745 | loff_t i_size = i_size_read(inode); | |
746 | loff_t lower_size_before_truncate; | |
747 | loff_t lower_size_after_truncate; | |
748 | ||
5f3ef64f TH |
749 | if (unlikely((ia->ia_size == i_size))) { |
750 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 751 | return 0; |
5f3ef64f | 752 | } |
3b06b3eb | 753 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
754 | if (rc) |
755 | return rc; | |
2b0143b5 | 756 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
237fead6 | 757 | /* Switch on growing or shrinking file */ |
5f3ef64f | 758 | if (ia->ia_size > i_size) { |
2ed92554 MH |
759 | char zero[] = { 0x00 }; |
760 | ||
5f3ef64f | 761 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
762 | /* Write a single 0 at the last position of the file; |
763 | * this triggers code that will fill in 0's throughout | |
764 | * the intermediate portion of the previous end of the | |
765 | * file and the new and of the file */ | |
48c1e44a | 766 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
767 | (ia->ia_size - 1), 1); |
768 | } else { /* ia->ia_size < i_size_read(inode) */ | |
769 | /* We're chopping off all the pages down to the page | |
770 | * in which ia->ia_size is located. Fill in the end of | |
771 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to | |
2ed92554 MH |
772 | * PAGE_CACHE_SIZE with zeros. */ |
773 | size_t num_zeros = (PAGE_CACHE_SIZE | |
5f3ef64f | 774 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
2ed92554 | 775 | |
13a791b4 | 776 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 777 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
778 | lower_ia->ia_size = ia->ia_size; |
779 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 780 | goto out; |
13a791b4 | 781 | } |
2ed92554 MH |
782 | if (num_zeros) { |
783 | char *zeros_virt; | |
784 | ||
785 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
786 | if (!zeros_virt) { | |
787 | rc = -ENOMEM; | |
48c1e44a | 788 | goto out; |
2ed92554 | 789 | } |
48c1e44a | 790 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 791 | ia->ia_size, num_zeros); |
2ed92554 | 792 | kfree(zeros_virt); |
5dda6992 | 793 | if (rc) { |
240e2df5 MH |
794 | printk(KERN_ERR "Error attempting to zero out " |
795 | "the remainder of the end page on " | |
796 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 797 | goto out; |
240e2df5 MH |
798 | } |
799 | } | |
2c27c65e | 800 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 801 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
802 | if (rc) { |
803 | printk(KERN_ERR "Problem with " | |
804 | "ecryptfs_write_inode_size_to_metadata; " | |
805 | "rc = [%d]\n", rc); | |
48c1e44a | 806 | goto out; |
dd2a3b7a | 807 | } |
237fead6 MH |
808 | /* We are reducing the size of the ecryptfs file, and need to |
809 | * know if we need to reduce the size of the lower file. */ | |
810 | lower_size_before_truncate = | |
811 | upper_size_to_lower_size(crypt_stat, i_size); | |
812 | lower_size_after_truncate = | |
5f3ef64f TH |
813 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
814 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
815 | lower_ia->ia_size = lower_size_after_truncate; | |
816 | lower_ia->ia_valid |= ATTR_SIZE; | |
817 | } else | |
818 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 819 | } |
237fead6 | 820 | out: |
332ab16f | 821 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
822 | return rc; |
823 | } | |
824 | ||
a261a039 TH |
825 | static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) |
826 | { | |
827 | struct ecryptfs_crypt_stat *crypt_stat; | |
828 | loff_t lower_oldsize, lower_newsize; | |
829 | ||
830 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
831 | lower_oldsize = upper_size_to_lower_size(crypt_stat, | |
832 | i_size_read(inode)); | |
833 | lower_newsize = upper_size_to_lower_size(crypt_stat, offset); | |
834 | if (lower_newsize > lower_oldsize) { | |
835 | /* | |
836 | * The eCryptfs inode and the new *lower* size are mixed here | |
837 | * because we may not have the lower i_mutex held and/or it may | |
838 | * not be appropriate to call inode_newsize_ok() with inodes | |
839 | * from other filesystems. | |
840 | */ | |
841 | return inode_newsize_ok(inode, lower_newsize); | |
842 | } | |
843 | ||
844 | return 0; | |
845 | } | |
846 | ||
5f3ef64f TH |
847 | /** |
848 | * ecryptfs_truncate | |
849 | * @dentry: The ecryptfs layer dentry | |
850 | * @new_length: The length to expand the file to | |
851 | * | |
852 | * Simple function that handles the truncation of an eCryptfs inode and | |
853 | * its corresponding lower inode. | |
854 | * | |
855 | * Returns zero on success; non-zero otherwise | |
856 | */ | |
857 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
858 | { | |
859 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
860 | struct iattr lower_ia = { .ia_valid = 0 }; | |
861 | int rc; | |
862 | ||
2b0143b5 | 863 | rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); |
a261a039 TH |
864 | if (rc) |
865 | return rc; | |
866 | ||
5f3ef64f TH |
867 | rc = truncate_upper(dentry, &ia, &lower_ia); |
868 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
869 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
870 | ||
5955102c | 871 | inode_lock(d_inode(lower_dentry)); |
27ac0ffe | 872 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
5955102c | 873 | inode_unlock(d_inode(lower_dentry)); |
5f3ef64f TH |
874 | } |
875 | return rc; | |
876 | } | |
877 | ||
237fead6 | 878 | static int |
10556cb2 | 879 | ecryptfs_permission(struct inode *inode, int mask) |
237fead6 | 880 | { |
f419a2e3 | 881 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
882 | } |
883 | ||
884 | /** | |
885 | * ecryptfs_setattr | |
886 | * @dentry: dentry handle to the inode to modify | |
887 | * @ia: Structure with flags of what to change and values | |
888 | * | |
889 | * Updates the metadata of an inode. If the update is to the size | |
890 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
891 | * of both the ecryptfs inode and the lower inode. | |
892 | * | |
893 | * All other metadata changes will be passed right to the lower filesystem, | |
894 | * and we will just update our inode to look like the lower. | |
895 | */ | |
896 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
897 | { | |
898 | int rc = 0; | |
899 | struct dentry *lower_dentry; | |
5f3ef64f | 900 | struct iattr lower_ia; |
237fead6 MH |
901 | struct inode *inode; |
902 | struct inode *lower_inode; | |
903 | struct ecryptfs_crypt_stat *crypt_stat; | |
904 | ||
2b0143b5 | 905 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
e10f281b MH |
906 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
907 | ecryptfs_init_crypt_stat(crypt_stat); | |
2b0143b5 | 908 | inode = d_inode(dentry); |
237fead6 | 909 | lower_inode = ecryptfs_inode_to_lower(inode); |
e10f281b MH |
910 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
911 | mutex_lock(&crypt_stat->cs_mutex); | |
e36cb0b8 | 912 | if (d_is_dir(dentry)) |
e10f281b | 913 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
e36cb0b8 | 914 | else if (d_is_reg(dentry) |
64ee4808 MH |
915 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) |
916 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 917 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 918 | |
e10f281b MH |
919 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
920 | dentry->d_sb)->mount_crypt_stat; | |
3b06b3eb | 921 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
922 | if (rc) { |
923 | mutex_unlock(&crypt_stat->cs_mutex); | |
924 | goto out; | |
925 | } | |
d7cdc5fe | 926 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 927 | ecryptfs_put_lower_file(inode); |
5dda6992 | 928 | if (rc) { |
e10f281b MH |
929 | if (!(mount_crypt_stat->flags |
930 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
931 | rc = -EIO; | |
25bd8174 | 932 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 933 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
934 | "or the key could not be retrieved. " |
935 | "Plaintext passthrough mode is not " | |
e10f281b | 936 | "enabled; returning -EIO\n"); |
e10f281b | 937 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
938 | goto out; |
939 | } | |
940 | rc = 0; | |
3aeb86ea TH |
941 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
942 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 943 | } |
e10f281b MH |
944 | } |
945 | mutex_unlock(&crypt_stat->cs_mutex); | |
a261a039 TH |
946 | |
947 | rc = inode_change_ok(inode, ia); | |
948 | if (rc) | |
949 | goto out; | |
950 | if (ia->ia_valid & ATTR_SIZE) { | |
951 | rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); | |
952 | if (rc) | |
953 | goto out; | |
954 | } | |
955 | ||
5f3ef64f TH |
956 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
957 | if (ia->ia_valid & ATTR_FILE) | |
958 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 959 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 960 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
961 | if (rc < 0) |
962 | goto out; | |
963 | } | |
1ac564ec JL |
964 | |
965 | /* | |
966 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
967 | * to interpret this in its own way. | |
968 | */ | |
5f3ef64f TH |
969 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
970 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 971 | |
5955102c | 972 | inode_lock(d_inode(lower_dentry)); |
27ac0ffe | 973 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
5955102c | 974 | inode_unlock(d_inode(lower_dentry)); |
237fead6 | 975 | out: |
9afa2fb6 | 976 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
977 | return rc; |
978 | } | |
979 | ||
111d61a2 TH |
980 | static int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
981 | struct kstat *stat) | |
3a60a168 TH |
982 | { |
983 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; | |
984 | int rc = 0; | |
985 | ||
986 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
987 | dentry->d_sb)->mount_crypt_stat; | |
2b0143b5 | 988 | generic_fillattr(d_inode(dentry), stat); |
3a60a168 TH |
989 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
990 | char *target; | |
991 | size_t targetsiz; | |
992 | ||
b22e8fed AV |
993 | target = ecryptfs_readlink_lower(dentry, &targetsiz); |
994 | if (!IS_ERR(target)) { | |
3a60a168 TH |
995 | kfree(target); |
996 | stat->size = targetsiz; | |
b22e8fed AV |
997 | } else { |
998 | rc = PTR_ERR(target); | |
3a60a168 TH |
999 | } |
1000 | } | |
1001 | return rc; | |
1002 | } | |
1003 | ||
111d61a2 TH |
1004 | static int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1005 | struct kstat *stat) | |
f8f484d1 TH |
1006 | { |
1007 | struct kstat lower_stat; | |
1008 | int rc; | |
1009 | ||
3dadecce | 1010 | rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat); |
f8f484d1 | 1011 | if (!rc) { |
2b0143b5 DH |
1012 | fsstack_copy_attr_all(d_inode(dentry), |
1013 | ecryptfs_inode_to_lower(d_inode(dentry))); | |
1014 | generic_fillattr(d_inode(dentry), stat); | |
f8f484d1 TH |
1015 | stat->blocks = lower_stat.blocks; |
1016 | } | |
1017 | return rc; | |
1018 | } | |
1019 | ||
dd2a3b7a | 1020 | int |
237fead6 MH |
1021 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
1022 | size_t size, int flags) | |
1023 | { | |
1024 | int rc = 0; | |
1025 | struct dentry *lower_dentry; | |
1026 | ||
1027 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2b0143b5 | 1028 | if (!d_inode(lower_dentry)->i_op->setxattr) { |
cfce08c6 | 1029 | rc = -EOPNOTSUPP; |
237fead6 MH |
1030 | goto out; |
1031 | } | |
48b512e6 RS |
1032 | |
1033 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); | |
2b0143b5 DH |
1034 | if (!rc && d_really_is_positive(dentry)) |
1035 | fsstack_copy_attr_all(d_inode(dentry), d_inode(lower_dentry)); | |
237fead6 MH |
1036 | out: |
1037 | return rc; | |
1038 | } | |
1039 | ||
d7cdc5fe MH |
1040 | ssize_t |
1041 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
1042 | void *value, size_t size) | |
1043 | { | |
1044 | int rc = 0; | |
1045 | ||
2b0143b5 | 1046 | if (!d_inode(lower_dentry)->i_op->getxattr) { |
cfce08c6 | 1047 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1048 | goto out; |
1049 | } | |
5955102c | 1050 | inode_lock(d_inode(lower_dentry)); |
2b0143b5 | 1051 | rc = d_inode(lower_dentry)->i_op->getxattr(lower_dentry, name, value, |
d7cdc5fe | 1052 | size); |
5955102c | 1053 | inode_unlock(d_inode(lower_dentry)); |
d7cdc5fe MH |
1054 | out: |
1055 | return rc; | |
1056 | } | |
1057 | ||
7896b631 | 1058 | static ssize_t |
237fead6 MH |
1059 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
1060 | size_t size) | |
1061 | { | |
2ed92554 MH |
1062 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
1063 | value, size); | |
237fead6 MH |
1064 | } |
1065 | ||
1066 | static ssize_t | |
1067 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1068 | { | |
1069 | int rc = 0; | |
1070 | struct dentry *lower_dentry; | |
1071 | ||
1072 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2b0143b5 | 1073 | if (!d_inode(lower_dentry)->i_op->listxattr) { |
cfce08c6 | 1074 | rc = -EOPNOTSUPP; |
237fead6 MH |
1075 | goto out; |
1076 | } | |
5955102c | 1077 | inode_lock(d_inode(lower_dentry)); |
2b0143b5 | 1078 | rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); |
5955102c | 1079 | inode_unlock(d_inode(lower_dentry)); |
237fead6 MH |
1080 | out: |
1081 | return rc; | |
1082 | } | |
1083 | ||
1084 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
1085 | { | |
1086 | int rc = 0; | |
1087 | struct dentry *lower_dentry; | |
1088 | ||
1089 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2b0143b5 | 1090 | if (!d_inode(lower_dentry)->i_op->removexattr) { |
cfce08c6 | 1091 | rc = -EOPNOTSUPP; |
237fead6 MH |
1092 | goto out; |
1093 | } | |
5955102c | 1094 | inode_lock(d_inode(lower_dentry)); |
2b0143b5 | 1095 | rc = d_inode(lower_dentry)->i_op->removexattr(lower_dentry, name); |
5955102c | 1096 | inode_unlock(d_inode(lower_dentry)); |
237fead6 MH |
1097 | out: |
1098 | return rc; | |
1099 | } | |
1100 | ||
754661f1 | 1101 | const struct inode_operations ecryptfs_symlink_iops = { |
408bd629 | 1102 | .readlink = generic_readlink, |
6b255391 | 1103 | .get_link = ecryptfs_get_link, |
237fead6 MH |
1104 | .permission = ecryptfs_permission, |
1105 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1106 | .getattr = ecryptfs_getattr_link, |
237fead6 MH |
1107 | .setxattr = ecryptfs_setxattr, |
1108 | .getxattr = ecryptfs_getxattr, | |
1109 | .listxattr = ecryptfs_listxattr, | |
1110 | .removexattr = ecryptfs_removexattr | |
1111 | }; | |
1112 | ||
754661f1 | 1113 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1114 | .create = ecryptfs_create, |
1115 | .lookup = ecryptfs_lookup, | |
1116 | .link = ecryptfs_link, | |
1117 | .unlink = ecryptfs_unlink, | |
1118 | .symlink = ecryptfs_symlink, | |
1119 | .mkdir = ecryptfs_mkdir, | |
1120 | .rmdir = ecryptfs_rmdir, | |
1121 | .mknod = ecryptfs_mknod, | |
1122 | .rename = ecryptfs_rename, | |
1123 | .permission = ecryptfs_permission, | |
1124 | .setattr = ecryptfs_setattr, | |
1125 | .setxattr = ecryptfs_setxattr, | |
1126 | .getxattr = ecryptfs_getxattr, | |
1127 | .listxattr = ecryptfs_listxattr, | |
1128 | .removexattr = ecryptfs_removexattr | |
1129 | }; | |
1130 | ||
754661f1 | 1131 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1132 | .permission = ecryptfs_permission, |
1133 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1134 | .getattr = ecryptfs_getattr, |
237fead6 MH |
1135 | .setxattr = ecryptfs_setxattr, |
1136 | .getxattr = ecryptfs_getxattr, | |
1137 | .listxattr = ecryptfs_listxattr, | |
1138 | .removexattr = ecryptfs_removexattr | |
1139 | }; |