• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /**
3  * eCryptfs: Linux filesystem encryption layer
4  *
5  * Copyright (C) 1997-2004 Erez Zadok
6  * Copyright (C) 2001-2004 Stony Brook University
7  * Copyright (C) 2004-2007 International Business Machines Corp.
8  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
9  *              Michael C. Thompsion <mcthomps@us.ibm.com>
10  */
11 
12 #include <linux/file.h>
13 #include <linux/vmalloc.h>
14 #include <linux/pagemap.h>
15 #include <linux/dcache.h>
16 #include <linux/namei.h>
17 #include <linux/mount.h>
18 #include <linux/fs_stack.h>
19 #include <linux/slab.h>
20 #include <linux/xattr.h>
21 #include <asm/unaligned.h>
22 #include "ecryptfs_kernel.h"
23 
lock_parent(struct dentry * dentry)24 static struct dentry *lock_parent(struct dentry *dentry)
25 {
26 	struct dentry *dir;
27 
28 	dir = dget_parent(dentry);
29 	inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
30 	return dir;
31 }
32 
unlock_dir(struct dentry * dir)33 static void unlock_dir(struct dentry *dir)
34 {
35 	inode_unlock(d_inode(dir));
36 	dput(dir);
37 }
38 
ecryptfs_inode_test(struct inode * inode,void * lower_inode)39 static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
40 {
41 	return ecryptfs_inode_to_lower(inode) == lower_inode;
42 }
43 
ecryptfs_inode_set(struct inode * inode,void * opaque)44 static int ecryptfs_inode_set(struct inode *inode, void *opaque)
45 {
46 	struct inode *lower_inode = opaque;
47 
48 	ecryptfs_set_inode_lower(inode, lower_inode);
49 	fsstack_copy_attr_all(inode, lower_inode);
50 	/* i_size will be overwritten for encrypted regular files */
51 	fsstack_copy_inode_size(inode, lower_inode);
52 	inode->i_ino = lower_inode->i_ino;
53 	inode->i_mapping->a_ops = &ecryptfs_aops;
54 
55 	if (S_ISLNK(inode->i_mode))
56 		inode->i_op = &ecryptfs_symlink_iops;
57 	else if (S_ISDIR(inode->i_mode))
58 		inode->i_op = &ecryptfs_dir_iops;
59 	else
60 		inode->i_op = &ecryptfs_main_iops;
61 
62 	if (S_ISDIR(inode->i_mode))
63 		inode->i_fop = &ecryptfs_dir_fops;
64 	else if (special_file(inode->i_mode))
65 		init_special_inode(inode, inode->i_mode, inode->i_rdev);
66 	else
67 		inode->i_fop = &ecryptfs_main_fops;
68 
69 	return 0;
70 }
71 
__ecryptfs_get_inode(struct inode * lower_inode,struct super_block * sb)72 static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
73 					  struct super_block *sb)
74 {
75 	struct inode *inode;
76 
77 	if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
78 		return ERR_PTR(-EXDEV);
79 
80 	/* Reject dealing with casefold directories. */
81 	if (IS_CASEFOLDED(lower_inode)) {
82 		pr_err_ratelimited("%s: Can't handle casefolded directory.\n",
83 				   __func__);
84 		return ERR_PTR(-EREMOTE);
85 	}
86 
87 	if (!igrab(lower_inode))
88 		return ERR_PTR(-ESTALE);
89 	inode = iget5_locked(sb, (unsigned long)lower_inode,
90 			     ecryptfs_inode_test, ecryptfs_inode_set,
91 			     lower_inode);
92 	if (!inode) {
93 		iput(lower_inode);
94 		return ERR_PTR(-EACCES);
95 	}
96 	if (!(inode->i_state & I_NEW))
97 		iput(lower_inode);
98 
99 	return inode;
100 }
101 
ecryptfs_get_inode(struct inode * lower_inode,struct super_block * sb)102 struct inode *ecryptfs_get_inode(struct inode *lower_inode,
103 				 struct super_block *sb)
104 {
105 	struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
106 
107 	if (!IS_ERR(inode) && (inode->i_state & I_NEW))
108 		unlock_new_inode(inode);
109 
110 	return inode;
111 }
112 
113 /**
114  * ecryptfs_interpose
115  * @lower_dentry: Existing dentry in the lower filesystem
116  * @dentry: ecryptfs' dentry
117  * @sb: ecryptfs's super_block
118  *
119  * Interposes upper and lower dentries.
120  *
121  * Returns zero on success; non-zero otherwise
122  */
ecryptfs_interpose(struct dentry * lower_dentry,struct dentry * dentry,struct super_block * sb)123 static int ecryptfs_interpose(struct dentry *lower_dentry,
124 			      struct dentry *dentry, struct super_block *sb)
125 {
126 	struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb);
127 
128 	if (IS_ERR(inode))
129 		return PTR_ERR(inode);
130 	d_instantiate(dentry, inode);
131 
132 	return 0;
133 }
134 
ecryptfs_do_unlink(struct inode * dir,struct dentry * dentry,struct inode * inode)135 static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry,
136 			      struct inode *inode)
137 {
138 	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
139 	struct dentry *lower_dir_dentry;
140 	struct inode *lower_dir_inode;
141 	int rc;
142 
143 	lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent);
144 	lower_dir_inode = d_inode(lower_dir_dentry);
145 	inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT);
146 	dget(lower_dentry);	// don't even try to make the lower negative
147 	if (lower_dentry->d_parent != lower_dir_dentry)
148 		rc = -EINVAL;
149 	else if (d_unhashed(lower_dentry))
150 		rc = -EINVAL;
151 	else
152 		rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL);
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 out_unlock:
161 	dput(lower_dentry);
162 	inode_unlock(lower_dir_inode);
163 	if (!rc)
164 		d_drop(dentry);
165 	return rc;
166 }
167 
168 /**
169  * ecryptfs_do_create
170  * @directory_inode: inode of the new file's dentry's parent in ecryptfs
171  * @ecryptfs_dentry: New file's dentry in ecryptfs
172  * @mode: The mode of the new file
173  *
174  * Creates the underlying file and the eCryptfs inode which will link to
175  * it. It will also update the eCryptfs directory inode to mimic the
176  * stat of the lower directory inode.
177  *
178  * Returns the new eCryptfs inode on success; an ERR_PTR on error condition
179  */
180 static struct inode *
ecryptfs_do_create(struct inode * directory_inode,struct dentry * ecryptfs_dentry,umode_t mode)181 ecryptfs_do_create(struct inode *directory_inode,
182 		   struct dentry *ecryptfs_dentry, umode_t mode)
183 {
184 	int rc;
185 	struct dentry *lower_dentry;
186 	struct dentry *lower_dir_dentry;
187 	struct inode *inode;
188 
189 	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
190 	lower_dir_dentry = lock_parent(lower_dentry);
191 	rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true);
192 	if (rc) {
193 		printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
194 		       "rc = [%d]\n", __func__, rc);
195 		inode = ERR_PTR(rc);
196 		goto out_lock;
197 	}
198 	inode = __ecryptfs_get_inode(d_inode(lower_dentry),
199 				     directory_inode->i_sb);
200 	if (IS_ERR(inode)) {
201 		vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL);
202 		goto out_lock;
203 	}
204 	fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry));
205 	fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry));
206 out_lock:
207 	unlock_dir(lower_dir_dentry);
208 	return inode;
209 }
210 
211 /**
212  * ecryptfs_initialize_file
213  *
214  * Cause the file to be changed from a basic empty file to an ecryptfs
215  * file with a header and first data page.
216  *
217  * Returns zero on success
218  */
ecryptfs_initialize_file(struct dentry * ecryptfs_dentry,struct inode * ecryptfs_inode)219 int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
220 			     struct inode *ecryptfs_inode)
221 {
222 	struct ecryptfs_crypt_stat *crypt_stat =
223 		&ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
224 	int rc = 0;
225 
226 	if (S_ISDIR(ecryptfs_inode->i_mode)) {
227 		ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
228 		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
229 		goto out;
230 	}
231 	ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
232 	rc = ecryptfs_new_file_context(ecryptfs_inode);
233 	if (rc) {
234 		ecryptfs_printk(KERN_ERR, "Error creating new file "
235 				"context; rc = [%d]\n", rc);
236 		goto out;
237 	}
238 	rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode);
239 	if (rc) {
240 		printk(KERN_ERR "%s: Error attempting to initialize "
241 			"the lower file for the dentry with name "
242 			"[%pd]; rc = [%d]\n", __func__,
243 			ecryptfs_dentry, rc);
244 		goto out;
245 	}
246 	rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode);
247 	if (rc)
248 		printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
249 	ecryptfs_put_lower_file(ecryptfs_inode);
250 out:
251 	return rc;
252 }
253 
254 /**
255  * ecryptfs_create
256  * @dir: The inode of the directory in which to create the file.
257  * @dentry: The eCryptfs dentry
258  * @mode: The mode of the new file.
259  *
260  * Creates a new file.
261  *
262  * Returns zero on success; non-zero on error condition
263  */
264 static int
ecryptfs_create(struct inode * directory_inode,struct dentry * ecryptfs_dentry,umode_t mode,bool excl)265 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
266 		umode_t mode, bool excl)
267 {
268 	struct inode *ecryptfs_inode;
269 	int rc;
270 
271 	ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry,
272 					    mode);
273 	if (IS_ERR(ecryptfs_inode)) {
274 		ecryptfs_printk(KERN_WARNING, "Failed to create file in"
275 				"lower filesystem\n");
276 		rc = PTR_ERR(ecryptfs_inode);
277 		goto out;
278 	}
279 	/* At this point, a file exists on "disk"; we need to make sure
280 	 * that this on disk file is prepared to be an ecryptfs file */
281 	rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode);
282 	if (rc) {
283 		ecryptfs_do_unlink(directory_inode, ecryptfs_dentry,
284 				   ecryptfs_inode);
285 		iget_failed(ecryptfs_inode);
286 		goto out;
287 	}
288 	d_instantiate_new(ecryptfs_dentry, ecryptfs_inode);
289 out:
290 	return rc;
291 }
292 
ecryptfs_i_size_read(struct dentry * dentry,struct inode * inode)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 "
302 			"[%pd]; rc = [%d]\n", __func__,
303 			dentry, rc);
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 
324 /**
325  * ecryptfs_lookup_interpose - Dentry interposition for a lookup
326  */
ecryptfs_lookup_interpose(struct dentry * dentry,struct dentry * lower_dentry)327 static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry,
328 				     struct dentry *lower_dentry)
329 {
330 	struct path *path = ecryptfs_dentry_to_lower_path(dentry->d_parent);
331 	struct inode *inode, *lower_inode;
332 	struct ecryptfs_dentry_info *dentry_info;
333 	int rc = 0;
334 
335 	dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
336 	if (!dentry_info) {
337 		dput(lower_dentry);
338 		return ERR_PTR(-ENOMEM);
339 	}
340 
341 	fsstack_copy_attr_atime(d_inode(dentry->d_parent),
342 				d_inode(path->dentry));
343 	BUG_ON(!d_count(lower_dentry));
344 
345 	ecryptfs_set_dentry_private(dentry, dentry_info);
346 	dentry_info->lower_path.mnt = mntget(path->mnt);
347 	dentry_info->lower_path.dentry = lower_dentry;
348 
349 	/*
350 	 * negative dentry can go positive under us here - its parent is not
351 	 * locked.  That's OK and that could happen just as we return from
352 	 * ecryptfs_lookup() anyway.  Just need to be careful and fetch
353 	 * ->d_inode only once - it's not stable here.
354 	 */
355 	lower_inode = READ_ONCE(lower_dentry->d_inode);
356 
357 	if (!lower_inode) {
358 		/* We want to add because we couldn't find in lower */
359 		d_add(dentry, NULL);
360 		return NULL;
361 	}
362 	inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb);
363 	if (IS_ERR(inode)) {
364 		printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
365 		       __func__, PTR_ERR(inode));
366 		return ERR_CAST(inode);
367 	}
368 	if (S_ISREG(inode->i_mode)) {
369 		rc = ecryptfs_i_size_read(dentry, inode);
370 		if (rc) {
371 			make_bad_inode(inode);
372 			return ERR_PTR(rc);
373 		}
374 	}
375 
376 	if (inode->i_state & I_NEW)
377 		unlock_new_inode(inode);
378 	return d_splice_alias(inode, dentry);
379 }
380 
381 /**
382  * ecryptfs_lookup
383  * @ecryptfs_dir_inode: The eCryptfs directory inode
384  * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
385  * @flags: lookup flags
386  *
387  * Find a file on disk. If the file does not exist, then we'll add it to the
388  * dentry cache and continue on to read it from the disk.
389  */
ecryptfs_lookup(struct inode * ecryptfs_dir_inode,struct dentry * ecryptfs_dentry,unsigned int flags)390 static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
391 				      struct dentry *ecryptfs_dentry,
392 				      unsigned int flags)
393 {
394 	char *encrypted_and_encoded_name = NULL;
395 	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
396 	struct dentry *lower_dir_dentry, *lower_dentry;
397 	const char *name = ecryptfs_dentry->d_name.name;
398 	size_t len = ecryptfs_dentry->d_name.len;
399 	struct dentry *res;
400 	int rc = 0;
401 
402 	lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
403 
404 	mount_crypt_stat = &ecryptfs_superblock_to_private(
405 				ecryptfs_dentry->d_sb)->mount_crypt_stat;
406 	if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
407 		rc = ecryptfs_encrypt_and_encode_filename(
408 			&encrypted_and_encoded_name, &len,
409 			mount_crypt_stat, name, len);
410 		if (rc) {
411 			printk(KERN_ERR "%s: Error attempting to encrypt and encode "
412 			       "filename; rc = [%d]\n", __func__, rc);
413 			return ERR_PTR(rc);
414 		}
415 		name = encrypted_and_encoded_name;
416 	}
417 
418 	lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len);
419 	if (IS_ERR(lower_dentry)) {
420 		ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
421 				"[%ld] on lower_dentry = [%s]\n", __func__,
422 				PTR_ERR(lower_dentry),
423 				name);
424 		res = ERR_CAST(lower_dentry);
425 	} else {
426 		res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry);
427 	}
428 	kfree(encrypted_and_encoded_name);
429 	return res;
430 }
431 
ecryptfs_link(struct dentry * old_dentry,struct inode * dir,struct dentry * new_dentry)432 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
433 			 struct dentry *new_dentry)
434 {
435 	struct dentry *lower_old_dentry;
436 	struct dentry *lower_new_dentry;
437 	struct dentry *lower_dir_dentry;
438 	u64 file_size_save;
439 	int rc;
440 
441 	file_size_save = i_size_read(d_inode(old_dentry));
442 	lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
443 	lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
444 	dget(lower_old_dentry);
445 	dget(lower_new_dentry);
446 	lower_dir_dentry = lock_parent(lower_new_dentry);
447 	rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry),
448 		      lower_new_dentry, NULL);
449 	if (rc || d_really_is_negative(lower_new_dentry))
450 		goto out_lock;
451 	rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
452 	if (rc)
453 		goto out_lock;
454 	fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
455 	fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
456 	set_nlink(d_inode(old_dentry),
457 		  ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink);
458 	i_size_write(d_inode(new_dentry), file_size_save);
459 out_lock:
460 	unlock_dir(lower_dir_dentry);
461 	dput(lower_new_dentry);
462 	dput(lower_old_dentry);
463 	return rc;
464 }
465 
ecryptfs_unlink(struct inode * dir,struct dentry * dentry)466 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
467 {
468 	return ecryptfs_do_unlink(dir, dentry, d_inode(dentry));
469 }
470 
ecryptfs_symlink(struct inode * dir,struct dentry * dentry,const char * symname)471 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
472 			    const char *symname)
473 {
474 	int rc;
475 	struct dentry *lower_dentry;
476 	struct dentry *lower_dir_dentry;
477 	char *encoded_symname;
478 	size_t encoded_symlen;
479 	struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
480 
481 	lower_dentry = ecryptfs_dentry_to_lower(dentry);
482 	dget(lower_dentry);
483 	lower_dir_dentry = lock_parent(lower_dentry);
484 	mount_crypt_stat = &ecryptfs_superblock_to_private(
485 		dir->i_sb)->mount_crypt_stat;
486 	rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
487 						  &encoded_symlen,
488 						  mount_crypt_stat, symname,
489 						  strlen(symname));
490 	if (rc)
491 		goto out_lock;
492 	rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry,
493 			 encoded_symname);
494 	kfree(encoded_symname);
495 	if (rc || d_really_is_negative(lower_dentry))
496 		goto out_lock;
497 	rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
498 	if (rc)
499 		goto out_lock;
500 	fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
501 	fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
502 out_lock:
503 	unlock_dir(lower_dir_dentry);
504 	dput(lower_dentry);
505 	if (d_really_is_negative(dentry))
506 		d_drop(dentry);
507 	return rc;
508 }
509 
ecryptfs_mkdir(struct inode * dir,struct dentry * dentry,umode_t mode)510 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
511 {
512 	int rc;
513 	struct dentry *lower_dentry;
514 	struct dentry *lower_dir_dentry;
515 
516 	lower_dentry = ecryptfs_dentry_to_lower(dentry);
517 	lower_dir_dentry = lock_parent(lower_dentry);
518 	rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode);
519 	if (rc || d_really_is_negative(lower_dentry))
520 		goto out;
521 	rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
522 	if (rc)
523 		goto out;
524 	fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
525 	fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
526 	set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink);
527 out:
528 	unlock_dir(lower_dir_dentry);
529 	if (d_really_is_negative(dentry))
530 		d_drop(dentry);
531 	return rc;
532 }
533 
ecryptfs_rmdir(struct inode * dir,struct dentry * dentry)534 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
535 {
536 	struct dentry *lower_dentry;
537 	struct dentry *lower_dir_dentry;
538 	struct inode *lower_dir_inode;
539 	int rc;
540 
541 	lower_dentry = ecryptfs_dentry_to_lower(dentry);
542 	lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent);
543 	lower_dir_inode = d_inode(lower_dir_dentry);
544 
545 	inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT);
546 	dget(lower_dentry);	// don't even try to make the lower negative
547 	if (lower_dentry->d_parent != lower_dir_dentry)
548 		rc = -EINVAL;
549 	else if (d_unhashed(lower_dentry))
550 		rc = -EINVAL;
551 	else
552 		rc = vfs_rmdir(lower_dir_inode, lower_dentry);
553 	if (!rc) {
554 		clear_nlink(d_inode(dentry));
555 		fsstack_copy_attr_times(dir, lower_dir_inode);
556 		set_nlink(dir, lower_dir_inode->i_nlink);
557 	}
558 	dput(lower_dentry);
559 	inode_unlock(lower_dir_inode);
560 	if (!rc)
561 		d_drop(dentry);
562 	return rc;
563 }
564 
565 static int
ecryptfs_mknod(struct inode * dir,struct dentry * dentry,umode_t mode,dev_t dev)566 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
567 {
568 	int rc;
569 	struct dentry *lower_dentry;
570 	struct dentry *lower_dir_dentry;
571 
572 	lower_dentry = ecryptfs_dentry_to_lower(dentry);
573 	lower_dir_dentry = lock_parent(lower_dentry);
574 	rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev);
575 	if (rc || d_really_is_negative(lower_dentry))
576 		goto out;
577 	rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
578 	if (rc)
579 		goto out;
580 	fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
581 	fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
582 out:
583 	unlock_dir(lower_dir_dentry);
584 	if (d_really_is_negative(dentry))
585 		d_drop(dentry);
586 	return rc;
587 }
588 
589 static int
ecryptfs_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)590 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
591 		struct inode *new_dir, struct dentry *new_dentry,
592 		unsigned int flags)
593 {
594 	int rc;
595 	struct dentry *lower_old_dentry;
596 	struct dentry *lower_new_dentry;
597 	struct dentry *lower_old_dir_dentry;
598 	struct dentry *lower_new_dir_dentry;
599 	struct dentry *trap;
600 	struct inode *target_inode;
601 
602 	if (flags)
603 		return -EINVAL;
604 
605 	lower_old_dir_dentry = ecryptfs_dentry_to_lower(old_dentry->d_parent);
606 	lower_new_dir_dentry = ecryptfs_dentry_to_lower(new_dentry->d_parent);
607 
608 	lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
609 	lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
610 
611 	target_inode = d_inode(new_dentry);
612 
613 	trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
614 	dget(lower_new_dentry);
615 	rc = -EINVAL;
616 	if (lower_old_dentry->d_parent != lower_old_dir_dentry)
617 		goto out_lock;
618 	if (lower_new_dentry->d_parent != lower_new_dir_dentry)
619 		goto out_lock;
620 	if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry))
621 		goto out_lock;
622 	/* source should not be ancestor of target */
623 	if (trap == lower_old_dentry)
624 		goto out_lock;
625 	/* target should not be ancestor of source */
626 	if (trap == lower_new_dentry) {
627 		rc = -ENOTEMPTY;
628 		goto out_lock;
629 	}
630 	rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry,
631 			d_inode(lower_new_dir_dentry), lower_new_dentry,
632 			NULL, 0);
633 	if (rc)
634 		goto out_lock;
635 	if (target_inode)
636 		fsstack_copy_attr_all(target_inode,
637 				      ecryptfs_inode_to_lower(target_inode));
638 	fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry));
639 	if (new_dir != old_dir)
640 		fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry));
641 out_lock:
642 	dput(lower_new_dentry);
643 	unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
644 	return rc;
645 }
646 
ecryptfs_readlink_lower(struct dentry * dentry,size_t * bufsiz)647 static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz)
648 {
649 	DEFINE_DELAYED_CALL(done);
650 	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
651 	const char *link;
652 	char *buf;
653 	int rc;
654 
655 	link = vfs_get_link(lower_dentry, &done);
656 	if (IS_ERR(link))
657 		return ERR_CAST(link);
658 
659 	rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb,
660 						  link, strlen(link));
661 	do_delayed_call(&done);
662 	if (rc)
663 		return ERR_PTR(rc);
664 
665 	return buf;
666 }
667 
ecryptfs_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)668 static const char *ecryptfs_get_link(struct dentry *dentry,
669 				     struct inode *inode,
670 				     struct delayed_call *done)
671 {
672 	size_t len;
673 	char *buf;
674 
675 	if (!dentry)
676 		return ERR_PTR(-ECHILD);
677 
678 	buf = ecryptfs_readlink_lower(dentry, &len);
679 	if (IS_ERR(buf))
680 		return buf;
681 	fsstack_copy_attr_atime(d_inode(dentry),
682 				d_inode(ecryptfs_dentry_to_lower(dentry)));
683 	buf[len] = '\0';
684 	set_delayed_call(done, kfree_link, buf);
685 	return buf;
686 }
687 
688 /**
689  * upper_size_to_lower_size
690  * @crypt_stat: Crypt_stat associated with file
691  * @upper_size: Size of the upper file
692  *
693  * Calculate the required size of the lower file based on the
694  * specified size of the upper file. This calculation is based on the
695  * number of headers in the underlying file and the extent size.
696  *
697  * Returns Calculated size of the lower file.
698  */
699 static loff_t
upper_size_to_lower_size(struct ecryptfs_crypt_stat * crypt_stat,loff_t upper_size)700 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
701 			 loff_t upper_size)
702 {
703 	loff_t lower_size;
704 
705 	lower_size = ecryptfs_lower_header_size(crypt_stat);
706 	if (upper_size != 0) {
707 		loff_t num_extents;
708 
709 		num_extents = upper_size >> crypt_stat->extent_shift;
710 		if (upper_size & ~crypt_stat->extent_mask)
711 			num_extents++;
712 		lower_size += (num_extents * crypt_stat->extent_size);
713 	}
714 	return lower_size;
715 }
716 
717 /**
718  * truncate_upper
719  * @dentry: The ecryptfs layer dentry
720  * @ia: Address of the ecryptfs inode's attributes
721  * @lower_ia: Address of the lower inode's attributes
722  *
723  * Function to handle truncations modifying the size of the file. Note
724  * that the file sizes are interpolated. When expanding, we are simply
725  * writing strings of 0's out. When truncating, we truncate the upper
726  * inode and update the lower_ia according to the page index
727  * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
728  * the caller must use lower_ia in a call to notify_change() to perform
729  * the truncation of the lower inode.
730  *
731  * Returns zero on success; non-zero otherwise
732  */
truncate_upper(struct dentry * dentry,struct iattr * ia,struct iattr * lower_ia)733 static int truncate_upper(struct dentry *dentry, struct iattr *ia,
734 			  struct iattr *lower_ia)
735 {
736 	int rc = 0;
737 	struct inode *inode = d_inode(dentry);
738 	struct ecryptfs_crypt_stat *crypt_stat;
739 	loff_t i_size = i_size_read(inode);
740 	loff_t lower_size_before_truncate;
741 	loff_t lower_size_after_truncate;
742 
743 	if (unlikely((ia->ia_size == i_size))) {
744 		lower_ia->ia_valid &= ~ATTR_SIZE;
745 		return 0;
746 	}
747 	rc = ecryptfs_get_lower_file(dentry, inode);
748 	if (rc)
749 		return rc;
750 	crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
751 	/* Switch on growing or shrinking file */
752 	if (ia->ia_size > i_size) {
753 		char zero[] = { 0x00 };
754 
755 		lower_ia->ia_valid &= ~ATTR_SIZE;
756 		/* Write a single 0 at the last position of the file;
757 		 * this triggers code that will fill in 0's throughout
758 		 * the intermediate portion of the previous end of the
759 		 * file and the new and of the file */
760 		rc = ecryptfs_write(inode, zero,
761 				    (ia->ia_size - 1), 1);
762 	} else { /* ia->ia_size < i_size_read(inode) */
763 		/* We're chopping off all the pages down to the page
764 		 * in which ia->ia_size is located. Fill in the end of
765 		 * that page from (ia->ia_size & ~PAGE_MASK) to
766 		 * PAGE_SIZE with zeros. */
767 		size_t num_zeros = (PAGE_SIZE
768 				    - (ia->ia_size & ~PAGE_MASK));
769 
770 		if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
771 			truncate_setsize(inode, ia->ia_size);
772 			lower_ia->ia_size = ia->ia_size;
773 			lower_ia->ia_valid |= ATTR_SIZE;
774 			goto out;
775 		}
776 		if (num_zeros) {
777 			char *zeros_virt;
778 
779 			zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
780 			if (!zeros_virt) {
781 				rc = -ENOMEM;
782 				goto out;
783 			}
784 			rc = ecryptfs_write(inode, zeros_virt,
785 					    ia->ia_size, num_zeros);
786 			kfree(zeros_virt);
787 			if (rc) {
788 				printk(KERN_ERR "Error attempting to zero out "
789 				       "the remainder of the end page on "
790 				       "reducing truncate; rc = [%d]\n", rc);
791 				goto out;
792 			}
793 		}
794 		truncate_setsize(inode, ia->ia_size);
795 		rc = ecryptfs_write_inode_size_to_metadata(inode);
796 		if (rc) {
797 			printk(KERN_ERR	"Problem with "
798 			       "ecryptfs_write_inode_size_to_metadata; "
799 			       "rc = [%d]\n", rc);
800 			goto out;
801 		}
802 		/* We are reducing the size of the ecryptfs file, and need to
803 		 * know if we need to reduce the size of the lower file. */
804 		lower_size_before_truncate =
805 		    upper_size_to_lower_size(crypt_stat, i_size);
806 		lower_size_after_truncate =
807 		    upper_size_to_lower_size(crypt_stat, ia->ia_size);
808 		if (lower_size_after_truncate < lower_size_before_truncate) {
809 			lower_ia->ia_size = lower_size_after_truncate;
810 			lower_ia->ia_valid |= ATTR_SIZE;
811 		} else
812 			lower_ia->ia_valid &= ~ATTR_SIZE;
813 	}
814 out:
815 	ecryptfs_put_lower_file(inode);
816 	return rc;
817 }
818 
ecryptfs_inode_newsize_ok(struct inode * inode,loff_t offset)819 static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset)
820 {
821 	struct ecryptfs_crypt_stat *crypt_stat;
822 	loff_t lower_oldsize, lower_newsize;
823 
824 	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
825 	lower_oldsize = upper_size_to_lower_size(crypt_stat,
826 						 i_size_read(inode));
827 	lower_newsize = upper_size_to_lower_size(crypt_stat, offset);
828 	if (lower_newsize > lower_oldsize) {
829 		/*
830 		 * The eCryptfs inode and the new *lower* size are mixed here
831 		 * because we may not have the lower i_mutex held and/or it may
832 		 * not be appropriate to call inode_newsize_ok() with inodes
833 		 * from other filesystems.
834 		 */
835 		return inode_newsize_ok(inode, lower_newsize);
836 	}
837 
838 	return 0;
839 }
840 
841 /**
842  * ecryptfs_truncate
843  * @dentry: The ecryptfs layer dentry
844  * @new_length: The length to expand the file to
845  *
846  * Simple function that handles the truncation of an eCryptfs inode and
847  * its corresponding lower inode.
848  *
849  * Returns zero on success; non-zero otherwise
850  */
ecryptfs_truncate(struct dentry * dentry,loff_t new_length)851 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
852 {
853 	struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
854 	struct iattr lower_ia = { .ia_valid = 0 };
855 	int rc;
856 
857 	rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length);
858 	if (rc)
859 		return rc;
860 
861 	rc = truncate_upper(dentry, &ia, &lower_ia);
862 	if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
863 		struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
864 
865 		inode_lock(d_inode(lower_dentry));
866 		rc = notify_change(lower_dentry, &lower_ia, NULL);
867 		inode_unlock(d_inode(lower_dentry));
868 	}
869 	return rc;
870 }
871 
872 static int
ecryptfs_permission(struct inode * inode,int mask)873 ecryptfs_permission(struct inode *inode, int mask)
874 {
875 	return inode_permission(ecryptfs_inode_to_lower(inode), mask);
876 }
877 
878 /**
879  * ecryptfs_setattr
880  * @dentry: dentry handle to the inode to modify
881  * @ia: Structure with flags of what to change and values
882  *
883  * Updates the metadata of an inode. If the update is to the size
884  * i.e. truncation, then ecryptfs_truncate will handle the size modification
885  * of both the ecryptfs inode and the lower inode.
886  *
887  * All other metadata changes will be passed right to the lower filesystem,
888  * and we will just update our inode to look like the lower.
889  */
ecryptfs_setattr(struct dentry * dentry,struct iattr * ia)890 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
891 {
892 	int rc = 0;
893 	struct dentry *lower_dentry;
894 	struct iattr lower_ia;
895 	struct inode *inode;
896 	struct inode *lower_inode;
897 	struct ecryptfs_crypt_stat *crypt_stat;
898 
899 	crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
900 	if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) {
901 		rc = ecryptfs_init_crypt_stat(crypt_stat);
902 		if (rc)
903 			return rc;
904 	}
905 	inode = d_inode(dentry);
906 	lower_inode = ecryptfs_inode_to_lower(inode);
907 	lower_dentry = ecryptfs_dentry_to_lower(dentry);
908 	mutex_lock(&crypt_stat->cs_mutex);
909 	if (d_is_dir(dentry))
910 		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
911 	else if (d_is_reg(dentry)
912 		 && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
913 		     || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
914 		struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
915 
916 		mount_crypt_stat = &ecryptfs_superblock_to_private(
917 			dentry->d_sb)->mount_crypt_stat;
918 		rc = ecryptfs_get_lower_file(dentry, inode);
919 		if (rc) {
920 			mutex_unlock(&crypt_stat->cs_mutex);
921 			goto out;
922 		}
923 		rc = ecryptfs_read_metadata(dentry);
924 		ecryptfs_put_lower_file(inode);
925 		if (rc) {
926 			if (!(mount_crypt_stat->flags
927 			      & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
928 				rc = -EIO;
929 				printk(KERN_WARNING "Either the lower file "
930 				       "is not in a valid eCryptfs format, "
931 				       "or the key could not be retrieved. "
932 				       "Plaintext passthrough mode is not "
933 				       "enabled; returning -EIO\n");
934 				mutex_unlock(&crypt_stat->cs_mutex);
935 				goto out;
936 			}
937 			rc = 0;
938 			crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
939 					       | ECRYPTFS_ENCRYPTED);
940 		}
941 	}
942 	mutex_unlock(&crypt_stat->cs_mutex);
943 
944 	rc = setattr_prepare(dentry, ia);
945 	if (rc)
946 		goto out;
947 	if (ia->ia_valid & ATTR_SIZE) {
948 		rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size);
949 		if (rc)
950 			goto out;
951 	}
952 
953 	memcpy(&lower_ia, ia, sizeof(lower_ia));
954 	if (ia->ia_valid & ATTR_FILE)
955 		lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
956 	if (ia->ia_valid & ATTR_SIZE) {
957 		rc = truncate_upper(dentry, ia, &lower_ia);
958 		if (rc < 0)
959 			goto out;
960 	}
961 
962 	/*
963 	 * mode change is for clearing setuid/setgid bits. Allow lower fs
964 	 * to interpret this in its own way.
965 	 */
966 	if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
967 		lower_ia.ia_valid &= ~ATTR_MODE;
968 
969 	inode_lock(d_inode(lower_dentry));
970 	rc = notify_change(lower_dentry, &lower_ia, NULL);
971 	inode_unlock(d_inode(lower_dentry));
972 out:
973 	fsstack_copy_attr_all(inode, lower_inode);
974 	return rc;
975 }
976 
ecryptfs_getattr_link(const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)977 static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat,
978 				 u32 request_mask, unsigned int flags)
979 {
980 	struct dentry *dentry = path->dentry;
981 	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
982 	int rc = 0;
983 
984 	mount_crypt_stat = &ecryptfs_superblock_to_private(
985 						dentry->d_sb)->mount_crypt_stat;
986 	generic_fillattr(d_inode(dentry), stat);
987 	if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
988 		char *target;
989 		size_t targetsiz;
990 
991 		target = ecryptfs_readlink_lower(dentry, &targetsiz);
992 		if (!IS_ERR(target)) {
993 			kfree(target);
994 			stat->size = targetsiz;
995 		} else {
996 			rc = PTR_ERR(target);
997 		}
998 	}
999 	return rc;
1000 }
1001 
ecryptfs_getattr(const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)1002 static int ecryptfs_getattr(const struct path *path, struct kstat *stat,
1003 			    u32 request_mask, unsigned int flags)
1004 {
1005 	struct dentry *dentry = path->dentry;
1006 	struct kstat lower_stat;
1007 	int rc;
1008 
1009 	rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat,
1010 			 request_mask, flags);
1011 	if (!rc) {
1012 		fsstack_copy_attr_all(d_inode(dentry),
1013 				      ecryptfs_inode_to_lower(d_inode(dentry)));
1014 		generic_fillattr(d_inode(dentry), stat);
1015 		stat->blocks = lower_stat.blocks;
1016 	}
1017 	return rc;
1018 }
1019 
1020 int
ecryptfs_setxattr(struct dentry * dentry,struct inode * inode,const char * name,const void * value,size_t size,int flags)1021 ecryptfs_setxattr(struct dentry *dentry, struct inode *inode,
1022 		  const char *name, const void *value,
1023 		  size_t size, int flags)
1024 {
1025 	int rc;
1026 	struct dentry *lower_dentry;
1027 
1028 	lower_dentry = ecryptfs_dentry_to_lower(dentry);
1029 	if (!(d_inode(lower_dentry)->i_opflags & IOP_XATTR)) {
1030 		rc = -EOPNOTSUPP;
1031 		goto out;
1032 	}
1033 	rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1034 	if (!rc && inode)
1035 		fsstack_copy_attr_all(inode, d_inode(lower_dentry));
1036 out:
1037 	return rc;
1038 }
1039 
1040 ssize_t
ecryptfs_getxattr_lower(struct dentry * lower_dentry,struct inode * lower_inode,const char * name,void * value,size_t size)1041 ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode,
1042 			const char *name, void *value, size_t size)
1043 {
1044 	int rc;
1045 
1046 	if (!(lower_inode->i_opflags & IOP_XATTR)) {
1047 		rc = -EOPNOTSUPP;
1048 		goto out;
1049 	}
1050 	inode_lock(lower_inode);
1051 	rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size,
1052 			    XATTR_NOSECURITY);
1053 	inode_unlock(lower_inode);
1054 out:
1055 	return rc;
1056 }
1057 
1058 static ssize_t
ecryptfs_getxattr(struct dentry * dentry,struct inode * inode,const char * name,void * value,size_t size)1059 ecryptfs_getxattr(struct dentry *dentry, struct inode *inode,
1060 		  const char *name, void *value, size_t size)
1061 {
1062 	return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry),
1063 				       ecryptfs_inode_to_lower(inode),
1064 				       name, value, size);
1065 }
1066 
1067 static ssize_t
ecryptfs_listxattr(struct dentry * dentry,char * list,size_t size)1068 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1069 {
1070 	int rc = 0;
1071 	struct dentry *lower_dentry;
1072 
1073 	lower_dentry = ecryptfs_dentry_to_lower(dentry);
1074 	if (!d_inode(lower_dentry)->i_op->listxattr) {
1075 		rc = -EOPNOTSUPP;
1076 		goto out;
1077 	}
1078 	inode_lock(d_inode(lower_dentry));
1079 	rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size);
1080 	inode_unlock(d_inode(lower_dentry));
1081 out:
1082 	return rc;
1083 }
1084 
ecryptfs_removexattr(struct dentry * dentry,struct inode * inode,const char * name)1085 static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode,
1086 				const char *name)
1087 {
1088 	int rc;
1089 	struct dentry *lower_dentry;
1090 	struct inode *lower_inode;
1091 
1092 	lower_dentry = ecryptfs_dentry_to_lower(dentry);
1093 	lower_inode = ecryptfs_inode_to_lower(inode);
1094 	if (!(lower_inode->i_opflags & IOP_XATTR)) {
1095 		rc = -EOPNOTSUPP;
1096 		goto out;
1097 	}
1098 	inode_lock(lower_inode);
1099 	rc = __vfs_removexattr(lower_dentry, name);
1100 	inode_unlock(lower_inode);
1101 out:
1102 	return rc;
1103 }
1104 
1105 const struct inode_operations ecryptfs_symlink_iops = {
1106 	.get_link = ecryptfs_get_link,
1107 	.permission = ecryptfs_permission,
1108 	.setattr = ecryptfs_setattr,
1109 	.getattr = ecryptfs_getattr_link,
1110 	.listxattr = ecryptfs_listxattr,
1111 };
1112 
1113 const struct inode_operations ecryptfs_dir_iops = {
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 	.listxattr = ecryptfs_listxattr,
1126 };
1127 
1128 const struct inode_operations ecryptfs_main_iops = {
1129 	.permission = ecryptfs_permission,
1130 	.setattr = ecryptfs_setattr,
1131 	.getattr = ecryptfs_getattr,
1132 	.listxattr = ecryptfs_listxattr,
1133 };
1134 
ecryptfs_xattr_get(const struct xattr_handler * handler,struct dentry * dentry,struct inode * inode,const char * name,void * buffer,size_t size,int flags)1135 static int ecryptfs_xattr_get(const struct xattr_handler *handler,
1136 			      struct dentry *dentry, struct inode *inode,
1137 			      const char *name, void *buffer, size_t size,
1138 			      int flags)
1139 {
1140 	return ecryptfs_getxattr(dentry, inode, name, buffer, size);
1141 }
1142 
ecryptfs_xattr_set(const struct xattr_handler * handler,struct dentry * dentry,struct inode * inode,const char * name,const void * value,size_t size,int flags)1143 static int ecryptfs_xattr_set(const struct xattr_handler *handler,
1144 			      struct dentry *dentry, struct inode *inode,
1145 			      const char *name, const void *value, size_t size,
1146 			      int flags)
1147 {
1148 	if (value)
1149 		return ecryptfs_setxattr(dentry, inode, name, value, size, flags);
1150 	else {
1151 		BUG_ON(flags != XATTR_REPLACE);
1152 		return ecryptfs_removexattr(dentry, inode, name);
1153 	}
1154 }
1155 
1156 static const struct xattr_handler ecryptfs_xattr_handler = {
1157 	.prefix = "",  /* match anything */
1158 	.get = ecryptfs_xattr_get,
1159 	.set = ecryptfs_xattr_set,
1160 };
1161 
1162 const struct xattr_handler *ecryptfs_xattr_handlers[] = {
1163 	&ecryptfs_xattr_handler,
1164 	NULL
1165 };
1166