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Commit | Line | Data |
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237fead6 MH |
1 | /** |
2 | * eCryptfs: Linux filesystem encryption layer | |
3 | * | |
4 | * Copyright (C) 1997-2004 Erez Zadok | |
5 | * Copyright (C) 2001-2004 Stony Brook University | |
dd2a3b7a | 6 | * Copyright (C) 2004-2007 International Business Machines Corp. |
237fead6 MH |
7 | * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> |
8 | * Michael C. Thompsion <mcthomps@us.ibm.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License as | |
12 | * published by the Free Software Foundation; either version 2 of the | |
13 | * License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
23 | * 02111-1307, USA. | |
24 | */ | |
25 | ||
26 | #include <linux/file.h> | |
27 | #include <linux/vmalloc.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/dcache.h> | |
30 | #include <linux/namei.h> | |
31 | #include <linux/mount.h> | |
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 | */ |
b1168a92 AV |
327 | static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, |
328 | struct dentry *lower_dentry) | |
237fead6 | 329 | { |
2b0143b5 | 330 | struct inode *inode, *lower_inode = d_inode(lower_dentry); |
778aeb42 | 331 | struct ecryptfs_dentry_info *dentry_info; |
237fead6 | 332 | struct vfsmount *lower_mnt; |
778aeb42 TH |
333 | int rc = 0; |
334 | ||
778aeb42 | 335 | dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); |
778aeb42 | 336 | if (!dentry_info) { |
addd65ad MH |
337 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
338 | "to allocate ecryptfs_dentry_info struct\n", | |
339 | __func__); | |
778aeb42 | 340 | dput(lower_dentry); |
b1168a92 | 341 | return ERR_PTR(-ENOMEM); |
237fead6 | 342 | } |
0b1d9011 AV |
343 | |
344 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); | |
b1168a92 AV |
345 | fsstack_copy_attr_atime(d_inode(dentry->d_parent), |
346 | 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 | 355 | d_add(dentry, NULL); |
b1168a92 | 356 | return NULL; |
237fead6 | 357 | } |
b1168a92 | 358 | inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb); |
5ccf9203 | 359 | if (IS_ERR(inode)) { |
778aeb42 TH |
360 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", |
361 | __func__, PTR_ERR(inode)); | |
b1168a92 | 362 | return ERR_CAST(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 | 367 | make_bad_inode(inode); |
b1168a92 | 368 | return ERR_PTR(rc); |
237fead6 | 369 | } |
237fead6 | 370 | } |
778aeb42 | 371 | |
3b06b3eb TH |
372 | if (inode->i_state & I_NEW) |
373 | unlock_new_inode(inode); | |
b1168a92 | 374 | return d_splice_alias(inode, dentry); |
addd65ad MH |
375 | } |
376 | ||
377 | /** | |
378 | * ecryptfs_lookup | |
379 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
380 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
89076bc3 | 381 | * @flags: lookup flags |
addd65ad MH |
382 | * |
383 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
384 | * dentry cache and continue on to read it from the disk. | |
385 | */ | |
386 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
387 | struct dentry *ecryptfs_dentry, | |
00cd8dd3 | 388 | unsigned int flags) |
addd65ad MH |
389 | { |
390 | char *encrypted_and_encoded_name = NULL; | |
88ae4ab9 | 391 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
addd65ad | 392 | struct dentry *lower_dir_dentry, *lower_dentry; |
88ae4ab9 AV |
393 | const char *name = ecryptfs_dentry->d_name.name; |
394 | size_t len = ecryptfs_dentry->d_name.len; | |
b1168a92 | 395 | struct dentry *res; |
addd65ad MH |
396 | int rc = 0; |
397 | ||
addd65ad | 398 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); |
88ae4ab9 | 399 | |
2aac0cf8 TH |
400 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
401 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
88ae4ab9 AV |
402 | if (mount_crypt_stat |
403 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)) { | |
404 | rc = ecryptfs_encrypt_and_encode_filename( | |
405 | &encrypted_and_encoded_name, &len, | |
406 | mount_crypt_stat, name, len); | |
407 | if (rc) { | |
408 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
409 | "filename; rc = [%d]\n", __func__, rc); | |
410 | return ERR_PTR(rc); | |
411 | } | |
412 | name = encrypted_and_encoded_name; | |
addd65ad | 413 | } |
88ae4ab9 AV |
414 | |
415 | lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); | |
addd65ad | 416 | if (IS_ERR(lower_dentry)) { |
8787c7a3 | 417 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
b1168a92 AV |
418 | "[%ld] on lower_dentry = [%s]\n", __func__, |
419 | PTR_ERR(lower_dentry), | |
88ae4ab9 | 420 | name); |
b1168a92 | 421 | res = ERR_CAST(lower_dentry); |
88ae4ab9 AV |
422 | } else { |
423 | res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); | |
addd65ad | 424 | } |
addd65ad | 425 | kfree(encrypted_and_encoded_name); |
b1168a92 | 426 | return res; |
237fead6 MH |
427 | } |
428 | ||
429 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
430 | struct dentry *new_dentry) | |
431 | { | |
432 | struct dentry *lower_old_dentry; | |
433 | struct dentry *lower_new_dentry; | |
434 | struct dentry *lower_dir_dentry; | |
435 | u64 file_size_save; | |
436 | int rc; | |
437 | ||
2b0143b5 | 438 | file_size_save = i_size_read(d_inode(old_dentry)); |
237fead6 MH |
439 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
440 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
441 | dget(lower_old_dentry); | |
442 | dget(lower_new_dentry); | |
443 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
2b0143b5 | 444 | rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), |
146a8595 | 445 | lower_new_dentry, NULL); |
2b0143b5 | 446 | if (rc || d_really_is_negative(lower_new_dentry)) |
237fead6 | 447 | goto out_lock; |
5ccf9203 | 448 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
237fead6 MH |
449 | if (rc) |
450 | goto out_lock; | |
2b0143b5 DH |
451 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
452 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
453 | set_nlink(d_inode(old_dentry), | |
454 | ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); | |
455 | i_size_write(d_inode(new_dentry), file_size_save); | |
237fead6 MH |
456 | out_lock: |
457 | unlock_dir(lower_dir_dentry); | |
458 | dput(lower_new_dentry); | |
459 | dput(lower_old_dentry); | |
237fead6 MH |
460 | return rc; |
461 | } | |
462 | ||
463 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
464 | { | |
2b0143b5 | 465 | return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); |
237fead6 MH |
466 | } |
467 | ||
468 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
469 | const char *symname) | |
470 | { | |
471 | int rc; | |
472 | struct dentry *lower_dentry; | |
473 | struct dentry *lower_dir_dentry; | |
237fead6 | 474 | char *encoded_symname; |
addd65ad MH |
475 | size_t encoded_symlen; |
476 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
477 | |
478 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
479 | dget(lower_dentry); | |
480 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
481 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
482 | dir->i_sb)->mount_crypt_stat; | |
483 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
484 | &encoded_symlen, | |
addd65ad MH |
485 | mount_crypt_stat, symname, |
486 | strlen(symname)); | |
487 | if (rc) | |
237fead6 | 488 | goto out_lock; |
2b0143b5 | 489 | rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry, |
db2e747b | 490 | encoded_symname); |
237fead6 | 491 | kfree(encoded_symname); |
2b0143b5 | 492 | if (rc || d_really_is_negative(lower_dentry)) |
237fead6 | 493 | goto out_lock; |
5ccf9203 | 494 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
495 | if (rc) |
496 | goto out_lock; | |
2b0143b5 DH |
497 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
498 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
237fead6 MH |
499 | out_lock: |
500 | unlock_dir(lower_dir_dentry); | |
501 | dput(lower_dentry); | |
2b0143b5 | 502 | if (d_really_is_negative(dentry)) |
237fead6 MH |
503 | d_drop(dentry); |
504 | return rc; | |
505 | } | |
506 | ||
18bb1db3 | 507 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
237fead6 MH |
508 | { |
509 | int rc; | |
510 | struct dentry *lower_dentry; | |
511 | struct dentry *lower_dir_dentry; | |
512 | ||
513 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
514 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 DH |
515 | rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode); |
516 | if (rc || d_really_is_negative(lower_dentry)) | |
237fead6 | 517 | goto out; |
5ccf9203 | 518 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
519 | if (rc) |
520 | goto out; | |
2b0143b5 DH |
521 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
522 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
523 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); | |
237fead6 MH |
524 | out: |
525 | unlock_dir(lower_dir_dentry); | |
2b0143b5 | 526 | if (d_really_is_negative(dentry)) |
237fead6 MH |
527 | d_drop(dentry); |
528 | return rc; | |
529 | } | |
530 | ||
531 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
532 | { | |
237fead6 | 533 | struct dentry *lower_dentry; |
237fead6 | 534 | struct dentry *lower_dir_dentry; |
45ec4aba | 535 | int rc; |
237fead6 MH |
536 | |
537 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 538 | dget(dentry); |
237fead6 | 539 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 540 | dget(lower_dentry); |
2b0143b5 | 541 | rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry); |
45ec4aba | 542 | dput(lower_dentry); |
2b0143b5 DH |
543 | if (!rc && d_really_is_positive(dentry)) |
544 | clear_nlink(d_inode(dentry)); | |
545 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); | |
546 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); | |
237fead6 MH |
547 | unlock_dir(lower_dir_dentry); |
548 | if (!rc) | |
549 | d_drop(dentry); | |
45ec4aba | 550 | dput(dentry); |
237fead6 MH |
551 | return rc; |
552 | } | |
553 | ||
554 | static int | |
1a67aafb | 555 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
237fead6 MH |
556 | { |
557 | int rc; | |
558 | struct dentry *lower_dentry; | |
559 | struct dentry *lower_dir_dentry; | |
560 | ||
561 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
562 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 DH |
563 | rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev); |
564 | if (rc || d_really_is_negative(lower_dentry)) | |
237fead6 | 565 | goto out; |
5ccf9203 | 566 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
567 | if (rc) |
568 | goto out; | |
2b0143b5 DH |
569 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
570 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
237fead6 MH |
571 | out: |
572 | unlock_dir(lower_dir_dentry); | |
2b0143b5 | 573 | if (d_really_is_negative(dentry)) |
237fead6 MH |
574 | d_drop(dentry); |
575 | return rc; | |
576 | } | |
577 | ||
578 | static int | |
579 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
580 | struct inode *new_dir, struct dentry *new_dentry, |
581 | unsigned int flags) | |
237fead6 MH |
582 | { |
583 | int rc; | |
584 | struct dentry *lower_old_dentry; | |
585 | struct dentry *lower_new_dentry; | |
586 | struct dentry *lower_old_dir_dentry; | |
587 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 588 | struct dentry *trap = NULL; |
8335eafc | 589 | struct inode *target_inode; |
237fead6 | 590 | |
1cd66c93 MS |
591 | if (flags) |
592 | return -EINVAL; | |
593 | ||
237fead6 MH |
594 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
595 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
596 | dget(lower_old_dentry); | |
597 | dget(lower_new_dentry); | |
598 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
599 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
2b0143b5 | 600 | target_inode = d_inode(new_dentry); |
0d132f73 EZ |
601 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
602 | /* source should not be ancestor of target */ | |
603 | if (trap == lower_old_dentry) { | |
604 | rc = -EINVAL; | |
605 | goto out_lock; | |
606 | } | |
607 | /* target should not be ancestor of source */ | |
608 | if (trap == lower_new_dentry) { | |
609 | rc = -ENOTEMPTY; | |
610 | goto out_lock; | |
611 | } | |
2b0143b5 DH |
612 | rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, |
613 | d_inode(lower_new_dir_dentry), lower_new_dentry, | |
520c8b16 | 614 | NULL, 0); |
237fead6 MH |
615 | if (rc) |
616 | goto out_lock; | |
8335eafc TH |
617 | if (target_inode) |
618 | fsstack_copy_attr_all(target_inode, | |
619 | ecryptfs_inode_to_lower(target_inode)); | |
2b0143b5 | 620 | fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); |
237fead6 | 621 | if (new_dir != old_dir) |
2b0143b5 | 622 | fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); |
237fead6 MH |
623 | out_lock: |
624 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
dd55c898 TH |
625 | dput(lower_new_dir_dentry); |
626 | dput(lower_old_dir_dentry); | |
237fead6 MH |
627 | dput(lower_new_dentry); |
628 | dput(lower_old_dentry); | |
629 | return rc; | |
630 | } | |
631 | ||
b22e8fed | 632 | static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) |
237fead6 | 633 | { |
6c988f57 | 634 | DEFINE_DELAYED_CALL(done); |
3a60a168 | 635 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
6c988f57 | 636 | const char *link; |
b22e8fed | 637 | char *buf; |
addd65ad | 638 | int rc; |
237fead6 | 639 | |
6c988f57 MS |
640 | link = vfs_get_link(lower_dentry, &done); |
641 | if (IS_ERR(link)) | |
642 | return ERR_CAST(link); | |
643 | ||
b22e8fed | 644 | rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, |
6c988f57 MS |
645 | link, strlen(link)); |
646 | do_delayed_call(&done); | |
647 | if (rc) | |
648 | return ERR_PTR(rc); | |
649 | ||
650 | return buf; | |
3a60a168 TH |
651 | } |
652 | ||
6b255391 | 653 | static const char *ecryptfs_get_link(struct dentry *dentry, |
fceef393 AV |
654 | struct inode *inode, |
655 | struct delayed_call *done) | |
3a60a168 | 656 | { |
b22e8fed | 657 | size_t len; |
6b255391 AV |
658 | char *buf; |
659 | ||
660 | if (!dentry) | |
661 | return ERR_PTR(-ECHILD); | |
662 | ||
663 | buf = ecryptfs_readlink_lower(dentry, &len); | |
b22e8fed | 664 | if (IS_ERR(buf)) |
680baacb | 665 | return buf; |
2b0143b5 DH |
666 | fsstack_copy_attr_atime(d_inode(dentry), |
667 | d_inode(ecryptfs_dentry_to_lower(dentry))); | |
408bd629 | 668 | buf[len] = '\0'; |
fceef393 AV |
669 | set_delayed_call(done, kfree_link, buf); |
670 | return buf; | |
237fead6 MH |
671 | } |
672 | ||
237fead6 MH |
673 | /** |
674 | * upper_size_to_lower_size | |
675 | * @crypt_stat: Crypt_stat associated with file | |
676 | * @upper_size: Size of the upper file | |
677 | * | |
cc11beff | 678 | * Calculate the required size of the lower file based on the |
237fead6 MH |
679 | * specified size of the upper file. This calculation is based on the |
680 | * number of headers in the underlying file and the extent size. | |
681 | * | |
682 | * Returns Calculated size of the lower file. | |
683 | */ | |
684 | static loff_t | |
685 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
686 | loff_t upper_size) | |
687 | { | |
688 | loff_t lower_size; | |
689 | ||
157f1071 | 690 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
691 | if (upper_size != 0) { |
692 | loff_t num_extents; | |
693 | ||
694 | num_extents = upper_size >> crypt_stat->extent_shift; | |
695 | if (upper_size & ~crypt_stat->extent_mask) | |
696 | num_extents++; | |
697 | lower_size += (num_extents * crypt_stat->extent_size); | |
698 | } | |
699 | return lower_size; | |
700 | } | |
701 | ||
702 | /** | |
5f3ef64f | 703 | * truncate_upper |
237fead6 | 704 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
705 | * @ia: Address of the ecryptfs inode's attributes |
706 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
707 | * |
708 | * Function to handle truncations modifying the size of the file. Note | |
709 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
710 | * writing strings of 0's out. When truncating, we truncate the upper |
711 | * inode and update the lower_ia according to the page index | |
712 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
713 | * the caller must use lower_ia in a call to notify_change() to perform | |
714 | * the truncation of the lower inode. | |
237fead6 MH |
715 | * |
716 | * Returns zero on success; non-zero otherwise | |
717 | */ | |
5f3ef64f TH |
718 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
719 | struct iattr *lower_ia) | |
237fead6 MH |
720 | { |
721 | int rc = 0; | |
2b0143b5 | 722 | struct inode *inode = d_inode(dentry); |
237fead6 MH |
723 | struct ecryptfs_crypt_stat *crypt_stat; |
724 | loff_t i_size = i_size_read(inode); | |
725 | loff_t lower_size_before_truncate; | |
726 | loff_t lower_size_after_truncate; | |
727 | ||
5f3ef64f TH |
728 | if (unlikely((ia->ia_size == i_size))) { |
729 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 730 | return 0; |
5f3ef64f | 731 | } |
3b06b3eb | 732 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
733 | if (rc) |
734 | return rc; | |
2b0143b5 | 735 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
237fead6 | 736 | /* Switch on growing or shrinking file */ |
5f3ef64f | 737 | if (ia->ia_size > i_size) { |
2ed92554 MH |
738 | char zero[] = { 0x00 }; |
739 | ||
5f3ef64f | 740 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
741 | /* Write a single 0 at the last position of the file; |
742 | * this triggers code that will fill in 0's throughout | |
743 | * the intermediate portion of the previous end of the | |
744 | * file and the new and of the file */ | |
48c1e44a | 745 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
746 | (ia->ia_size - 1), 1); |
747 | } else { /* ia->ia_size < i_size_read(inode) */ | |
748 | /* We're chopping off all the pages down to the page | |
749 | * in which ia->ia_size is located. Fill in the end of | |
ea1754a0 KS |
750 | * that page from (ia->ia_size & ~PAGE_MASK) to |
751 | * PAGE_SIZE with zeros. */ | |
09cbfeaf KS |
752 | size_t num_zeros = (PAGE_SIZE |
753 | - (ia->ia_size & ~PAGE_MASK)); | |
2ed92554 | 754 | |
13a791b4 | 755 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 756 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
757 | lower_ia->ia_size = ia->ia_size; |
758 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 759 | goto out; |
13a791b4 | 760 | } |
2ed92554 MH |
761 | if (num_zeros) { |
762 | char *zeros_virt; | |
763 | ||
764 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
765 | if (!zeros_virt) { | |
766 | rc = -ENOMEM; | |
48c1e44a | 767 | goto out; |
2ed92554 | 768 | } |
48c1e44a | 769 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 770 | ia->ia_size, num_zeros); |
2ed92554 | 771 | kfree(zeros_virt); |
5dda6992 | 772 | if (rc) { |
240e2df5 MH |
773 | printk(KERN_ERR "Error attempting to zero out " |
774 | "the remainder of the end page on " | |
775 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 776 | goto out; |
240e2df5 MH |
777 | } |
778 | } | |
2c27c65e | 779 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 780 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
781 | if (rc) { |
782 | printk(KERN_ERR "Problem with " | |
783 | "ecryptfs_write_inode_size_to_metadata; " | |
784 | "rc = [%d]\n", rc); | |
48c1e44a | 785 | goto out; |
dd2a3b7a | 786 | } |
237fead6 MH |
787 | /* We are reducing the size of the ecryptfs file, and need to |
788 | * know if we need to reduce the size of the lower file. */ | |
789 | lower_size_before_truncate = | |
790 | upper_size_to_lower_size(crypt_stat, i_size); | |
791 | lower_size_after_truncate = | |
5f3ef64f TH |
792 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
793 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
794 | lower_ia->ia_size = lower_size_after_truncate; | |
795 | lower_ia->ia_valid |= ATTR_SIZE; | |
796 | } else | |
797 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 798 | } |
237fead6 | 799 | out: |
332ab16f | 800 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
801 | return rc; |
802 | } | |
803 | ||
a261a039 TH |
804 | static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) |
805 | { | |
806 | struct ecryptfs_crypt_stat *crypt_stat; | |
807 | loff_t lower_oldsize, lower_newsize; | |
808 | ||
809 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
810 | lower_oldsize = upper_size_to_lower_size(crypt_stat, | |
811 | i_size_read(inode)); | |
812 | lower_newsize = upper_size_to_lower_size(crypt_stat, offset); | |
813 | if (lower_newsize > lower_oldsize) { | |
814 | /* | |
815 | * The eCryptfs inode and the new *lower* size are mixed here | |
816 | * because we may not have the lower i_mutex held and/or it may | |
817 | * not be appropriate to call inode_newsize_ok() with inodes | |
818 | * from other filesystems. | |
819 | */ | |
820 | return inode_newsize_ok(inode, lower_newsize); | |
821 | } | |
822 | ||
823 | return 0; | |
824 | } | |
825 | ||
5f3ef64f TH |
826 | /** |
827 | * ecryptfs_truncate | |
828 | * @dentry: The ecryptfs layer dentry | |
829 | * @new_length: The length to expand the file to | |
830 | * | |
831 | * Simple function that handles the truncation of an eCryptfs inode and | |
832 | * its corresponding lower inode. | |
833 | * | |
834 | * Returns zero on success; non-zero otherwise | |
835 | */ | |
836 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
837 | { | |
838 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
839 | struct iattr lower_ia = { .ia_valid = 0 }; | |
840 | int rc; | |
841 | ||
2b0143b5 | 842 | rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); |
a261a039 TH |
843 | if (rc) |
844 | return rc; | |
845 | ||
5f3ef64f TH |
846 | rc = truncate_upper(dentry, &ia, &lower_ia); |
847 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
848 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
849 | ||
5955102c | 850 | inode_lock(d_inode(lower_dentry)); |
27ac0ffe | 851 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
5955102c | 852 | inode_unlock(d_inode(lower_dentry)); |
5f3ef64f TH |
853 | } |
854 | return rc; | |
855 | } | |
856 | ||
237fead6 | 857 | static int |
10556cb2 | 858 | ecryptfs_permission(struct inode *inode, int mask) |
237fead6 | 859 | { |
f419a2e3 | 860 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
861 | } |
862 | ||
863 | /** | |
864 | * ecryptfs_setattr | |
865 | * @dentry: dentry handle to the inode to modify | |
866 | * @ia: Structure with flags of what to change and values | |
867 | * | |
868 | * Updates the metadata of an inode. If the update is to the size | |
869 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
870 | * of both the ecryptfs inode and the lower inode. | |
871 | * | |
872 | * All other metadata changes will be passed right to the lower filesystem, | |
873 | * and we will just update our inode to look like the lower. | |
874 | */ | |
875 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
876 | { | |
877 | int rc = 0; | |
878 | struct dentry *lower_dentry; | |
5f3ef64f | 879 | struct iattr lower_ia; |
237fead6 MH |
880 | struct inode *inode; |
881 | struct inode *lower_inode; | |
882 | struct ecryptfs_crypt_stat *crypt_stat; | |
883 | ||
2b0143b5 | 884 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
e81f3340 HX |
885 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { |
886 | rc = ecryptfs_init_crypt_stat(crypt_stat); | |
887 | if (rc) | |
888 | return rc; | |
889 | } | |
2b0143b5 | 890 | inode = d_inode(dentry); |
237fead6 | 891 | lower_inode = ecryptfs_inode_to_lower(inode); |
e10f281b MH |
892 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
893 | mutex_lock(&crypt_stat->cs_mutex); | |
e36cb0b8 | 894 | if (d_is_dir(dentry)) |
e10f281b | 895 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
e36cb0b8 | 896 | else if (d_is_reg(dentry) |
64ee4808 MH |
897 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) |
898 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 899 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 900 | |
e10f281b MH |
901 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
902 | dentry->d_sb)->mount_crypt_stat; | |
3b06b3eb | 903 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
904 | if (rc) { |
905 | mutex_unlock(&crypt_stat->cs_mutex); | |
906 | goto out; | |
907 | } | |
d7cdc5fe | 908 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 909 | ecryptfs_put_lower_file(inode); |
5dda6992 | 910 | if (rc) { |
e10f281b MH |
911 | if (!(mount_crypt_stat->flags |
912 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
913 | rc = -EIO; | |
25bd8174 | 914 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 915 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
916 | "or the key could not be retrieved. " |
917 | "Plaintext passthrough mode is not " | |
e10f281b | 918 | "enabled; returning -EIO\n"); |
e10f281b | 919 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
920 | goto out; |
921 | } | |
922 | rc = 0; | |
3aeb86ea TH |
923 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
924 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 925 | } |
e10f281b MH |
926 | } |
927 | mutex_unlock(&crypt_stat->cs_mutex); | |
a261a039 | 928 | |
31051c85 | 929 | rc = setattr_prepare(dentry, ia); |
a261a039 TH |
930 | if (rc) |
931 | goto out; | |
932 | if (ia->ia_valid & ATTR_SIZE) { | |
933 | rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); | |
934 | if (rc) | |
935 | goto out; | |
936 | } | |
937 | ||
5f3ef64f TH |
938 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
939 | if (ia->ia_valid & ATTR_FILE) | |
940 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 941 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 942 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
943 | if (rc < 0) |
944 | goto out; | |
945 | } | |
1ac564ec JL |
946 | |
947 | /* | |
948 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
949 | * to interpret this in its own way. | |
950 | */ | |
5f3ef64f TH |
951 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
952 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 953 | |
5955102c | 954 | inode_lock(d_inode(lower_dentry)); |
27ac0ffe | 955 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
5955102c | 956 | inode_unlock(d_inode(lower_dentry)); |
237fead6 | 957 | out: |
9afa2fb6 | 958 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
959 | return rc; |
960 | } | |
961 | ||
a528d35e DH |
962 | static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat, |
963 | u32 request_mask, unsigned int flags) | |
3a60a168 | 964 | { |
a528d35e | 965 | struct dentry *dentry = path->dentry; |
3a60a168 TH |
966 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
967 | int rc = 0; | |
968 | ||
969 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
970 | dentry->d_sb)->mount_crypt_stat; | |
2b0143b5 | 971 | generic_fillattr(d_inode(dentry), stat); |
3a60a168 TH |
972 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
973 | char *target; | |
974 | size_t targetsiz; | |
975 | ||
b22e8fed AV |
976 | target = ecryptfs_readlink_lower(dentry, &targetsiz); |
977 | if (!IS_ERR(target)) { | |
3a60a168 TH |
978 | kfree(target); |
979 | stat->size = targetsiz; | |
b22e8fed AV |
980 | } else { |
981 | rc = PTR_ERR(target); | |
3a60a168 TH |
982 | } |
983 | } | |
984 | return rc; | |
985 | } | |
986 | ||
a528d35e DH |
987 | static int ecryptfs_getattr(const struct path *path, struct kstat *stat, |
988 | u32 request_mask, unsigned int flags) | |
f8f484d1 | 989 | { |
a528d35e | 990 | struct dentry *dentry = path->dentry; |
f8f484d1 TH |
991 | struct kstat lower_stat; |
992 | int rc; | |
993 | ||
a528d35e DH |
994 | rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat, |
995 | request_mask, flags); | |
f8f484d1 | 996 | if (!rc) { |
2b0143b5 DH |
997 | fsstack_copy_attr_all(d_inode(dentry), |
998 | ecryptfs_inode_to_lower(d_inode(dentry))); | |
999 | generic_fillattr(d_inode(dentry), stat); | |
f8f484d1 TH |
1000 | stat->blocks = lower_stat.blocks; |
1001 | } | |
1002 | return rc; | |
1003 | } | |
1004 | ||
dd2a3b7a | 1005 | int |
3767e255 AV |
1006 | ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, |
1007 | const char *name, const void *value, | |
237fead6 MH |
1008 | size_t size, int flags) |
1009 | { | |
5d6c3191 | 1010 | int rc; |
237fead6 MH |
1011 | struct dentry *lower_dentry; |
1012 | ||
1013 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
5d6c3191 | 1014 | if (!(d_inode(lower_dentry)->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1015 | rc = -EOPNOTSUPP; |
237fead6 MH |
1016 | goto out; |
1017 | } | |
48b512e6 | 1018 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); |
3767e255 AV |
1019 | if (!rc && inode) |
1020 | fsstack_copy_attr_all(inode, d_inode(lower_dentry)); | |
237fead6 MH |
1021 | out: |
1022 | return rc; | |
1023 | } | |
1024 | ||
d7cdc5fe | 1025 | ssize_t |
ce23e640 AV |
1026 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, |
1027 | const char *name, void *value, size_t size) | |
d7cdc5fe | 1028 | { |
5d6c3191 | 1029 | int rc; |
d7cdc5fe | 1030 | |
5d6c3191 | 1031 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1032 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1033 | goto out; |
1034 | } | |
ce23e640 | 1035 | inode_lock(lower_inode); |
5d6c3191 | 1036 | rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size); |
ce23e640 | 1037 | inode_unlock(lower_inode); |
d7cdc5fe MH |
1038 | out: |
1039 | return rc; | |
1040 | } | |
1041 | ||
7896b631 | 1042 | static ssize_t |
ce23e640 AV |
1043 | ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, |
1044 | const char *name, void *value, size_t size) | |
237fead6 | 1045 | { |
ce23e640 AV |
1046 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), |
1047 | ecryptfs_inode_to_lower(inode), | |
1048 | name, value, size); | |
237fead6 MH |
1049 | } |
1050 | ||
1051 | static ssize_t | |
1052 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1053 | { | |
1054 | int rc = 0; | |
1055 | struct dentry *lower_dentry; | |
1056 | ||
1057 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2b0143b5 | 1058 | if (!d_inode(lower_dentry)->i_op->listxattr) { |
cfce08c6 | 1059 | rc = -EOPNOTSUPP; |
237fead6 MH |
1060 | goto out; |
1061 | } | |
5955102c | 1062 | inode_lock(d_inode(lower_dentry)); |
2b0143b5 | 1063 | rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); |
5955102c | 1064 | inode_unlock(d_inode(lower_dentry)); |
237fead6 MH |
1065 | out: |
1066 | return rc; | |
1067 | } | |
1068 | ||
4b899da5 AG |
1069 | static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, |
1070 | const char *name) | |
237fead6 | 1071 | { |
5d6c3191 | 1072 | int rc; |
237fead6 | 1073 | struct dentry *lower_dentry; |
4b899da5 | 1074 | struct inode *lower_inode; |
237fead6 MH |
1075 | |
1076 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
4b899da5 | 1077 | lower_inode = ecryptfs_inode_to_lower(inode); |
5d6c3191 | 1078 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1079 | rc = -EOPNOTSUPP; |
237fead6 MH |
1080 | goto out; |
1081 | } | |
4b899da5 | 1082 | inode_lock(lower_inode); |
5d6c3191 | 1083 | rc = __vfs_removexattr(lower_dentry, name); |
4b899da5 | 1084 | inode_unlock(lower_inode); |
237fead6 MH |
1085 | out: |
1086 | return rc; | |
1087 | } | |
1088 | ||
754661f1 | 1089 | const struct inode_operations ecryptfs_symlink_iops = { |
6b255391 | 1090 | .get_link = ecryptfs_get_link, |
237fead6 MH |
1091 | .permission = ecryptfs_permission, |
1092 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1093 | .getattr = ecryptfs_getattr_link, |
237fead6 | 1094 | .listxattr = ecryptfs_listxattr, |
237fead6 MH |
1095 | }; |
1096 | ||
754661f1 | 1097 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1098 | .create = ecryptfs_create, |
1099 | .lookup = ecryptfs_lookup, | |
1100 | .link = ecryptfs_link, | |
1101 | .unlink = ecryptfs_unlink, | |
1102 | .symlink = ecryptfs_symlink, | |
1103 | .mkdir = ecryptfs_mkdir, | |
1104 | .rmdir = ecryptfs_rmdir, | |
1105 | .mknod = ecryptfs_mknod, | |
1106 | .rename = ecryptfs_rename, | |
1107 | .permission = ecryptfs_permission, | |
1108 | .setattr = ecryptfs_setattr, | |
237fead6 | 1109 | .listxattr = ecryptfs_listxattr, |
237fead6 MH |
1110 | }; |
1111 | ||
754661f1 | 1112 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1113 | .permission = ecryptfs_permission, |
1114 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1115 | .getattr = ecryptfs_getattr, |
237fead6 | 1116 | .listxattr = ecryptfs_listxattr, |
4b899da5 AG |
1117 | }; |
1118 | ||
1119 | static int ecryptfs_xattr_get(const struct xattr_handler *handler, | |
1120 | struct dentry *dentry, struct inode *inode, | |
1121 | const char *name, void *buffer, size_t size) | |
1122 | { | |
1123 | return ecryptfs_getxattr(dentry, inode, name, buffer, size); | |
1124 | } | |
1125 | ||
1126 | static int ecryptfs_xattr_set(const struct xattr_handler *handler, | |
1127 | struct dentry *dentry, struct inode *inode, | |
1128 | const char *name, const void *value, size_t size, | |
1129 | int flags) | |
1130 | { | |
1131 | if (value) | |
1132 | return ecryptfs_setxattr(dentry, inode, name, value, size, flags); | |
1133 | else { | |
1134 | BUG_ON(flags != XATTR_REPLACE); | |
1135 | return ecryptfs_removexattr(dentry, inode, name); | |
1136 | } | |
1137 | } | |
1138 | ||
1139 | const struct xattr_handler ecryptfs_xattr_handler = { | |
1140 | .prefix = "", /* match anything */ | |
1141 | .get = ecryptfs_xattr_get, | |
1142 | .set = ecryptfs_xattr_set, | |
1143 | }; | |
1144 | ||
1145 | const struct xattr_handler *ecryptfs_xattr_handlers[] = { | |
1146 | &ecryptfs_xattr_handler, | |
1147 | NULL | |
237fead6 | 1148 | }; |