2 * eCryptfs: Linux filesystem encryption layer
4 * Copyright (C) 1997-2004 Erez Zadok
5 * Copyright (C) 2001-2004 Stony Brook University
6 * Copyright (C) 2004-2006 International Business Machines Corp.
7 * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
8 * Michael C. Thompsion <mcthomps@us.ibm.com>
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.
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.
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
26 #include <linux/file.h>
27 #include <linux/vmalloc.h>
28 #include <linux/pagemap.h>
29 #include <linux/dcache.h>
30 #include <linux/namei.h>
31 #include <linux/mount.h>
32 #include <linux/crypto.h>
33 #include <linux/fs_stack.h>
34 #include "ecryptfs_kernel.h"
36 static struct dentry *lock_parent(struct dentry *dentry)
40 dir = dget(dentry->d_parent);
41 mutex_lock(&(dir->d_inode->i_mutex));
45 static void unlock_parent(struct dentry *dentry)
47 mutex_unlock(&(dentry->d_parent->d_inode->i_mutex));
48 dput(dentry->d_parent);
51 static void unlock_dir(struct dentry *dir)
53 mutex_unlock(&dir->d_inode->i_mutex);
58 * ecryptfs_create_underlying_file
59 * @lower_dir_inode: inode of the parent in the lower fs of the new file
60 * @lower_dentry: New file's dentry in the lower fs
61 * @ecryptfs_dentry: New file's dentry in ecryptfs
62 * @mode: The mode of the new file
63 * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
65 * Creates the file in the lower file system.
67 * Returns zero on success; non-zero on error condition
70 ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
71 struct dentry *dentry, int mode,
74 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
75 struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
76 struct dentry *dentry_save;
77 struct vfsmount *vfsmount_save;
80 dentry_save = nd->dentry;
81 vfsmount_save = nd->mnt;
82 nd->dentry = lower_dentry;
84 rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
85 nd->dentry = dentry_save;
86 nd->mnt = vfsmount_save;
92 * @directory_inode: inode of the new file's dentry's parent in ecryptfs
93 * @ecryptfs_dentry: New file's dentry in ecryptfs
94 * @mode: The mode of the new file
95 * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
97 * Creates the underlying file and the eCryptfs inode which will link to
98 * it. It will also update the eCryptfs directory inode to mimic the
99 * stat of the lower directory inode.
101 * Returns zero on success; non-zero on error condition
104 ecryptfs_do_create(struct inode *directory_inode,
105 struct dentry *ecryptfs_dentry, int mode,
106 struct nameidata *nd)
109 struct dentry *lower_dentry;
110 struct dentry *lower_dir_dentry;
112 lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
113 lower_dir_dentry = lock_parent(lower_dentry);
114 if (unlikely(IS_ERR(lower_dir_dentry))) {
115 ecryptfs_printk(KERN_ERR, "Error locking directory of "
117 rc = PTR_ERR(lower_dir_dentry);
120 rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
121 ecryptfs_dentry, mode, nd);
123 ecryptfs_printk(KERN_ERR,
124 "Failure to create underlying file\n");
127 rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
128 directory_inode->i_sb, 0);
130 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
133 fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
134 fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
136 unlock_dir(lower_dir_dentry);
143 * @ecryptfs_dentry: the ecryptfs dentry
144 * @lower_file: The lower file
145 * @inode: The ecryptfs inode
146 * @lower_inode: The lower inode
148 * This is the code which will grow the file to its correct size.
150 static int grow_file(struct dentry *ecryptfs_dentry, struct file *lower_file,
151 struct inode *inode, struct inode *lower_inode)
154 struct file fake_file;
155 struct ecryptfs_file_info tmp_file_info;
157 memset(&fake_file, 0, sizeof(fake_file));
158 fake_file.f_path.dentry = ecryptfs_dentry;
159 memset(&tmp_file_info, 0, sizeof(tmp_file_info));
160 ecryptfs_set_file_private(&fake_file, &tmp_file_info);
161 ecryptfs_set_file_lower(&fake_file, lower_file);
162 rc = ecryptfs_fill_zeros(&fake_file, 1);
165 ecryptfs_inode_to_private(inode)->crypt_stat.flags,
166 ECRYPTFS_SECURITY_WARNING);
167 ecryptfs_printk(KERN_WARNING, "Error attempting to fill zeros "
168 "in file; rc = [%d]\n", rc);
171 i_size_write(inode, 0);
172 ecryptfs_write_inode_size_to_header(lower_file, lower_inode, inode);
173 ECRYPTFS_SET_FLAG(ecryptfs_inode_to_private(inode)->crypt_stat.flags,
180 * ecryptfs_initialize_file
182 * Cause the file to be changed from a basic empty file to an ecryptfs
183 * file with a header and first data page.
185 * Returns zero on success
187 static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
191 struct ecryptfs_crypt_stat *crypt_stat;
192 struct dentry *lower_dentry;
193 struct file *lower_file;
194 struct inode *inode, *lower_inode;
195 struct vfsmount *lower_mnt;
197 lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
198 ecryptfs_printk(KERN_DEBUG, "lower_dentry->d_name.name = [%s]\n",
199 lower_dentry->d_name.name);
200 inode = ecryptfs_dentry->d_inode;
201 crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
202 lower_flags = ((O_CREAT | O_WRONLY | O_TRUNC) & O_ACCMODE) | O_RDWR;
203 #if BITS_PER_LONG != 32
204 lower_flags |= O_LARGEFILE;
206 lower_mnt = ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry);
207 /* Corresponding fput() at end of this function */
208 if ((rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt,
210 ecryptfs_printk(KERN_ERR,
211 "Error opening dentry; rc = [%i]\n", rc);
214 lower_inode = lower_dentry->d_inode;
215 if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
216 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
217 ECRYPTFS_CLEAR_FLAG(crypt_stat->flags, ECRYPTFS_ENCRYPTED);
220 ECRYPTFS_SET_FLAG(crypt_stat->flags, ECRYPTFS_NEW_FILE);
221 ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
222 rc = ecryptfs_new_file_context(ecryptfs_dentry);
224 ecryptfs_printk(KERN_DEBUG, "Error creating new file "
228 rc = ecryptfs_write_headers(ecryptfs_dentry, lower_file);
230 ecryptfs_printk(KERN_DEBUG, "Error writing headers\n");
233 rc = grow_file(ecryptfs_dentry, lower_file, inode, lower_inode);
235 if ((rc = ecryptfs_close_lower_file(lower_file)))
236 printk(KERN_ERR "Error closing lower_file\n");
243 * @dir: The inode of the directory in which to create the file.
244 * @dentry: The eCryptfs dentry
245 * @mode: The mode of the new file.
248 * Creates a new file.
250 * Returns zero on success; non-zero on error condition
253 ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
254 int mode, struct nameidata *nd)
258 rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
260 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
261 "lower filesystem\n");
264 /* At this point, a file exists on "disk"; we need to make sure
265 * that this on disk file is prepared to be an ecryptfs file */
266 rc = ecryptfs_initialize_file(ecryptfs_dentry);
274 * @dentry: The dentry
275 * @nd: nameidata, may be NULL
277 * Find a file on disk. If the file does not exist, then we'll add it to the
278 * dentry cache and continue on to read it from the disk.
280 static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
281 struct nameidata *nd)
284 struct dentry *lower_dir_dentry;
285 struct dentry *lower_dentry;
286 struct vfsmount *lower_mnt;
288 unsigned int encoded_namelen;
289 struct ecryptfs_crypt_stat *crypt_stat = NULL;
290 char *page_virt = NULL;
291 struct inode *lower_inode;
294 lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent);
295 dentry->d_op = &ecryptfs_dops;
296 if ((dentry->d_name.len == 1 && !strcmp(dentry->d_name.name, "."))
297 || (dentry->d_name.len == 2
298 && !strcmp(dentry->d_name.name, ".."))) {
302 encoded_namelen = ecryptfs_encode_filename(crypt_stat,
306 if (encoded_namelen < 0) {
307 rc = encoded_namelen;
311 ecryptfs_printk(KERN_DEBUG, "encoded_name = [%s]; encoded_namelen "
312 "= [%d]\n", encoded_name, encoded_namelen);
313 lower_dentry = lookup_one_len(encoded_name, lower_dir_dentry,
314 encoded_namelen - 1);
316 if (IS_ERR(lower_dentry)) {
317 ecryptfs_printk(KERN_ERR, "ERR from lower_dentry\n");
318 rc = PTR_ERR(lower_dentry);
322 lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
323 ecryptfs_printk(KERN_DEBUG, "lower_dentry = [%p]; lower_dentry->"
324 "d_name.name = [%s]\n", lower_dentry,
325 lower_dentry->d_name.name);
326 lower_inode = lower_dentry->d_inode;
327 fsstack_copy_attr_atime(dir, lower_dir_dentry->d_inode);
328 BUG_ON(!atomic_read(&lower_dentry->d_count));
329 ecryptfs_set_dentry_private(dentry,
330 kmem_cache_alloc(ecryptfs_dentry_info_cache,
332 if (!ecryptfs_dentry_to_private(dentry)) {
334 ecryptfs_printk(KERN_ERR, "Out of memory whilst attempting "
335 "to allocate ecryptfs_dentry_info struct\n");
338 ecryptfs_set_dentry_lower(dentry, lower_dentry);
339 ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt);
340 if (!lower_dentry->d_inode) {
341 /* We want to add because we couldn't find in lower */
345 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 1);
347 ecryptfs_printk(KERN_ERR, "Error interposing\n");
350 if (S_ISDIR(lower_inode->i_mode)) {
351 ecryptfs_printk(KERN_DEBUG, "Is a directory; returning\n");
354 if (S_ISLNK(lower_inode->i_mode)) {
355 ecryptfs_printk(KERN_DEBUG, "Is a symlink; returning\n");
359 ecryptfs_printk(KERN_DEBUG, "We have a NULL nd, just leave"
360 "as we *think* we are about to unlink\n");
363 /* Released in this function */
364 page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2,
368 ecryptfs_printk(KERN_ERR,
369 "Cannot ecryptfs_kmalloc a page\n");
373 rc = ecryptfs_read_header_region(page_virt, lower_dentry, nd->mnt);
374 crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
375 if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_POLICY_APPLIED))
376 ecryptfs_set_default_sizes(crypt_stat);
379 ecryptfs_printk(KERN_WARNING, "Error reading header region;"
380 " assuming unencrypted\n");
382 if (!contains_ecryptfs_marker(page_virt
383 + ECRYPTFS_FILE_SIZE_BYTES)) {
384 kmem_cache_free(ecryptfs_header_cache_2, page_virt);
387 memcpy(&file_size, page_virt, sizeof(file_size));
388 file_size = be64_to_cpu(file_size);
389 i_size_write(dentry->d_inode, (loff_t)file_size);
391 kmem_cache_free(ecryptfs_header_cache_2, page_virt);
401 static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
402 struct dentry *new_dentry)
404 struct dentry *lower_old_dentry;
405 struct dentry *lower_new_dentry;
406 struct dentry *lower_dir_dentry;
410 file_size_save = i_size_read(old_dentry->d_inode);
411 lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
412 lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
413 dget(lower_old_dentry);
414 dget(lower_new_dentry);
415 lower_dir_dentry = lock_parent(lower_new_dentry);
416 rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
418 if (rc || !lower_new_dentry->d_inode)
420 rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
423 fsstack_copy_attr_times(dir, lower_new_dentry->d_inode);
424 fsstack_copy_inode_size(dir, lower_new_dentry->d_inode);
425 old_dentry->d_inode->i_nlink =
426 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
427 i_size_write(new_dentry->d_inode, file_size_save);
429 unlock_dir(lower_dir_dentry);
430 dput(lower_new_dentry);
431 dput(lower_old_dentry);
432 d_drop(lower_old_dentry);
438 static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
441 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
442 struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
444 lock_parent(lower_dentry);
445 rc = vfs_unlink(lower_dir_inode, lower_dentry);
447 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
450 fsstack_copy_attr_times(dir, lower_dir_inode);
451 dentry->d_inode->i_nlink =
452 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
453 dentry->d_inode->i_ctime = dir->i_ctime;
455 unlock_parent(lower_dentry);
459 static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
463 struct dentry *lower_dentry;
464 struct dentry *lower_dir_dentry;
466 char *encoded_symname;
467 unsigned int encoded_symlen;
468 struct ecryptfs_crypt_stat *crypt_stat = NULL;
470 lower_dentry = ecryptfs_dentry_to_lower(dentry);
472 lower_dir_dentry = lock_parent(lower_dentry);
474 encoded_symlen = ecryptfs_encode_filename(crypt_stat, symname,
477 if (encoded_symlen < 0) {
481 rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
482 encoded_symname, mode);
483 kfree(encoded_symname);
484 if (rc || !lower_dentry->d_inode)
486 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
489 fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
490 fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
492 unlock_dir(lower_dir_dentry);
494 if (!dentry->d_inode)
499 static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
502 struct dentry *lower_dentry;
503 struct dentry *lower_dir_dentry;
505 lower_dentry = ecryptfs_dentry_to_lower(dentry);
506 lower_dir_dentry = lock_parent(lower_dentry);
507 rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
508 if (rc || !lower_dentry->d_inode)
510 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
513 fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
514 fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
515 dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
517 unlock_dir(lower_dir_dentry);
518 if (!dentry->d_inode)
523 static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
525 struct dentry *lower_dentry;
526 struct dentry *lower_dir_dentry;
529 lower_dentry = ecryptfs_dentry_to_lower(dentry);
531 lower_dir_dentry = lock_parent(lower_dentry);
533 rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
536 d_delete(lower_dentry);
537 fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
538 dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
539 unlock_dir(lower_dir_dentry);
547 ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
550 struct dentry *lower_dentry;
551 struct dentry *lower_dir_dentry;
553 lower_dentry = ecryptfs_dentry_to_lower(dentry);
554 lower_dir_dentry = lock_parent(lower_dentry);
555 rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
556 if (rc || !lower_dentry->d_inode)
558 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
561 fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
562 fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
564 unlock_dir(lower_dir_dentry);
565 if (!dentry->d_inode)
571 ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
572 struct inode *new_dir, struct dentry *new_dentry)
575 struct dentry *lower_old_dentry;
576 struct dentry *lower_new_dentry;
577 struct dentry *lower_old_dir_dentry;
578 struct dentry *lower_new_dir_dentry;
580 lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
581 lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
582 dget(lower_old_dentry);
583 dget(lower_new_dentry);
584 lower_old_dir_dentry = dget_parent(lower_old_dentry);
585 lower_new_dir_dentry = dget_parent(lower_new_dentry);
586 lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
587 rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
588 lower_new_dir_dentry->d_inode, lower_new_dentry);
591 fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode, NULL);
592 if (new_dir != old_dir)
593 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode, NULL);
595 unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
596 dput(lower_new_dentry->d_parent);
597 dput(lower_old_dentry->d_parent);
598 dput(lower_new_dentry);
599 dput(lower_old_dentry);
604 ecryptfs_readlink(struct dentry *dentry, char __user * buf, int bufsiz)
607 struct dentry *lower_dentry;
611 struct ecryptfs_crypt_stat *crypt_stat;
613 lower_dentry = ecryptfs_dentry_to_lower(dentry);
614 if (!lower_dentry->d_inode->i_op ||
615 !lower_dentry->d_inode->i_op->readlink) {
619 /* Released in this function */
620 lower_buf = kmalloc(bufsiz, GFP_KERNEL);
621 if (lower_buf == NULL) {
622 ecryptfs_printk(KERN_ERR, "Out of memory\n");
628 ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ "
629 "lower_dentry->d_name.name = [%s]\n",
630 lower_dentry->d_name.name);
631 rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
632 (char __user *)lower_buf,
637 rc = ecryptfs_decode_filename(crypt_stat, lower_buf, rc,
640 goto out_free_lower_buf;
642 ecryptfs_printk(KERN_DEBUG, "Copying [%d] bytes "
643 "to userspace: [%*s]\n", rc,
645 if (copy_to_user(buf, decoded_name, rc))
649 fsstack_copy_attr_atime(dentry->d_inode,
650 lower_dentry->d_inode);
658 static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
661 int len = PAGE_SIZE, rc;
664 /* Released in ecryptfs_put_link(); only release here on error */
665 buf = kmalloc(len, GFP_KERNEL);
672 ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ "
673 "dentry->d_name.name = [%s]\n", dentry->d_name.name);
674 rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
680 nd_set_link(nd, buf);
689 ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
692 kfree(nd_get_link(nd));
696 * upper_size_to_lower_size
697 * @crypt_stat: Crypt_stat associated with file
698 * @upper_size: Size of the upper file
700 * Calculate the requried size of the lower file based on the
701 * specified size of the upper file. This calculation is based on the
702 * number of headers in the underlying file and the extent size.
704 * Returns Calculated size of the lower file.
707 upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
712 lower_size = ( crypt_stat->header_extent_size
713 * crypt_stat->num_header_extents_at_front );
714 if (upper_size != 0) {
717 num_extents = upper_size >> crypt_stat->extent_shift;
718 if (upper_size & ~crypt_stat->extent_mask)
720 lower_size += (num_extents * crypt_stat->extent_size);
727 * @dentry: The ecryptfs layer dentry
728 * @new_length: The length to expand the file to
730 * Function to handle truncations modifying the size of the file. Note
731 * that the file sizes are interpolated. When expanding, we are simply
732 * writing strings of 0's out. When truncating, we need to modify the
733 * underlying file size according to the page index interpolations.
735 * Returns zero on success; non-zero otherwise
737 int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
740 struct inode *inode = dentry->d_inode;
741 struct dentry *lower_dentry;
742 struct vfsmount *lower_mnt;
743 struct file fake_ecryptfs_file, *lower_file = NULL;
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;
749 if (unlikely((new_length == i_size)))
751 crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
752 /* Set up a fake ecryptfs file, this is used to interface with
753 * the file in the underlying filesystem so that the
754 * truncation has an effect there as well. */
755 memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file));
756 fake_ecryptfs_file.f_path.dentry = dentry;
757 /* Released at out_free: label */
758 ecryptfs_set_file_private(&fake_ecryptfs_file,
759 kmem_cache_alloc(ecryptfs_file_info_cache,
761 if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) {
765 lower_dentry = ecryptfs_dentry_to_lower(dentry);
766 /* This dget & mntget is released through fput at out_fput: */
767 lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
768 if ((rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt,
770 ecryptfs_printk(KERN_ERR,
771 "Error opening dentry; rc = [%i]\n", rc);
774 ecryptfs_set_file_lower(&fake_ecryptfs_file, lower_file);
775 /* Switch on growing or shrinking file */
776 if (new_length > i_size) {
777 rc = ecryptfs_fill_zeros(&fake_ecryptfs_file, new_length);
779 ecryptfs_printk(KERN_ERR,
780 "Problem with fill_zeros\n");
783 i_size_write(inode, new_length);
784 rc = ecryptfs_write_inode_size_to_header(lower_file,
785 lower_dentry->d_inode,
788 ecryptfs_printk(KERN_ERR,
789 "Problem with ecryptfs_write"
793 } else { /* new_length < i_size_read(inode) */
794 vmtruncate(inode, new_length);
795 ecryptfs_write_inode_size_to_header(lower_file,
796 lower_dentry->d_inode,
798 /* We are reducing the size of the ecryptfs file, and need to
799 * know if we need to reduce the size of the lower file. */
800 lower_size_before_truncate =
801 upper_size_to_lower_size(crypt_stat, i_size);
802 lower_size_after_truncate =
803 upper_size_to_lower_size(crypt_stat, new_length);
804 if (lower_size_after_truncate < lower_size_before_truncate)
805 vmtruncate(lower_dentry->d_inode,
806 lower_size_after_truncate);
808 /* Update the access times */
809 lower_dentry->d_inode->i_mtime = lower_dentry->d_inode->i_ctime
811 mark_inode_dirty_sync(inode);
813 if ((rc = ecryptfs_close_lower_file(lower_file)))
814 printk(KERN_ERR "Error closing lower_file\n");
816 if (ecryptfs_file_to_private(&fake_ecryptfs_file))
817 kmem_cache_free(ecryptfs_file_info_cache,
818 ecryptfs_file_to_private(&fake_ecryptfs_file));
824 ecryptfs_permission(struct inode *inode, int mask, struct nameidata *nd)
829 struct vfsmount *vfsmnt_save = nd->mnt;
830 struct dentry *dentry_save = nd->dentry;
832 nd->mnt = ecryptfs_dentry_to_lower_mnt(nd->dentry);
833 nd->dentry = ecryptfs_dentry_to_lower(nd->dentry);
834 rc = permission(ecryptfs_inode_to_lower(inode), mask, nd);
835 nd->mnt = vfsmnt_save;
836 nd->dentry = dentry_save;
838 rc = permission(ecryptfs_inode_to_lower(inode), mask, NULL);
844 * @dentry: dentry handle to the inode to modify
845 * @ia: Structure with flags of what to change and values
847 * Updates the metadata of an inode. If the update is to the size
848 * i.e. truncation, then ecryptfs_truncate will handle the size modification
849 * of both the ecryptfs inode and the lower inode.
851 * All other metadata changes will be passed right to the lower filesystem,
852 * and we will just update our inode to look like the lower.
854 static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
857 struct dentry *lower_dentry;
859 struct inode *lower_inode;
860 struct ecryptfs_crypt_stat *crypt_stat;
862 crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
863 lower_dentry = ecryptfs_dentry_to_lower(dentry);
864 inode = dentry->d_inode;
865 lower_inode = ecryptfs_inode_to_lower(inode);
866 if (ia->ia_valid & ATTR_SIZE) {
867 ecryptfs_printk(KERN_DEBUG,
868 "ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n",
869 ia->ia_valid, ATTR_SIZE);
870 rc = ecryptfs_truncate(dentry, ia->ia_size);
871 /* ecryptfs_truncate handles resizing of the lower file */
872 ia->ia_valid &= ~ATTR_SIZE;
873 ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [%x]\n",
878 rc = notify_change(lower_dentry, ia);
880 fsstack_copy_attr_all(inode, lower_inode, NULL);
885 ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
886 size_t size, int flags)
889 struct dentry *lower_dentry;
891 lower_dentry = ecryptfs_dentry_to_lower(dentry);
892 if (!lower_dentry->d_inode->i_op->setxattr) {
896 mutex_lock(&lower_dentry->d_inode->i_mutex);
897 rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value,
899 mutex_unlock(&lower_dentry->d_inode->i_mutex);
905 ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
909 struct dentry *lower_dentry;
911 lower_dentry = ecryptfs_dentry_to_lower(dentry);
912 if (!lower_dentry->d_inode->i_op->getxattr) {
916 mutex_lock(&lower_dentry->d_inode->i_mutex);
917 rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
919 mutex_unlock(&lower_dentry->d_inode->i_mutex);
925 ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
928 struct dentry *lower_dentry;
930 lower_dentry = ecryptfs_dentry_to_lower(dentry);
931 if (!lower_dentry->d_inode->i_op->listxattr) {
935 mutex_lock(&lower_dentry->d_inode->i_mutex);
936 rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
937 mutex_unlock(&lower_dentry->d_inode->i_mutex);
942 static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
945 struct dentry *lower_dentry;
947 lower_dentry = ecryptfs_dentry_to_lower(dentry);
948 if (!lower_dentry->d_inode->i_op->removexattr) {
952 mutex_lock(&lower_dentry->d_inode->i_mutex);
953 rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
954 mutex_unlock(&lower_dentry->d_inode->i_mutex);
959 int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
961 if ((ecryptfs_inode_to_lower(inode)
962 == (struct inode *)candidate_lower_inode))
968 int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
970 ecryptfs_init_inode(inode, (struct inode *)lower_inode);
974 struct inode_operations ecryptfs_symlink_iops = {
975 .readlink = ecryptfs_readlink,
976 .follow_link = ecryptfs_follow_link,
977 .put_link = ecryptfs_put_link,
978 .permission = ecryptfs_permission,
979 .setattr = ecryptfs_setattr,
980 .setxattr = ecryptfs_setxattr,
981 .getxattr = ecryptfs_getxattr,
982 .listxattr = ecryptfs_listxattr,
983 .removexattr = ecryptfs_removexattr
986 struct inode_operations ecryptfs_dir_iops = {
987 .create = ecryptfs_create,
988 .lookup = ecryptfs_lookup,
989 .link = ecryptfs_link,
990 .unlink = ecryptfs_unlink,
991 .symlink = ecryptfs_symlink,
992 .mkdir = ecryptfs_mkdir,
993 .rmdir = ecryptfs_rmdir,
994 .mknod = ecryptfs_mknod,
995 .rename = ecryptfs_rename,
996 .permission = ecryptfs_permission,
997 .setattr = ecryptfs_setattr,
998 .setxattr = ecryptfs_setxattr,
999 .getxattr = ecryptfs_getxattr,
1000 .listxattr = ecryptfs_listxattr,
1001 .removexattr = ecryptfs_removexattr
1004 struct inode_operations ecryptfs_main_iops = {
1005 .permission = ecryptfs_permission,
1006 .setattr = ecryptfs_setattr,
1007 .setxattr = ecryptfs_setxattr,
1008 .getxattr = ecryptfs_getxattr,
1009 .listxattr = ecryptfs_listxattr,
1010 .removexattr = ecryptfs_removexattr