2 * eCryptfs: Linux filesystem encryption layer
4 * Copyright (C) 1997-2003 Erez Zadok
5 * Copyright (C) 2001-2003 Stony Brook University
6 * Copyright (C) 2004-2006 International Business Machines Corp.
7 * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of the
12 * License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
25 #include <linux/dcache.h>
26 #include <linux/namei.h>
27 #include <linux/mount.h>
28 #include <linux/fs_stack.h>
29 #include "ecryptfs_kernel.h"
32 * ecryptfs_d_revalidate - revalidate an ecryptfs dentry
33 * @dentry: The ecryptfs dentry
34 * @nd: The associated nameidata
36 * Called when the VFS needs to revalidate a dentry. This
37 * is called whenever a name lookup finds a dentry in the
38 * dcache. Most filesystems leave this as NULL, because all their
39 * dentries in the dcache are valid.
41 * Returns 1 if valid, 0 otherwise.
44 static int ecryptfs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
46 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
47 struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
48 struct dentry *dentry_save;
49 struct vfsmount *vfsmount_save;
52 if (!lower_dentry->d_op || !lower_dentry->d_op->d_revalidate)
54 dentry_save = nd->path.dentry;
55 vfsmount_save = nd->path.mnt;
56 nd->path.dentry = lower_dentry;
57 nd->path.mnt = lower_mnt;
58 rc = lower_dentry->d_op->d_revalidate(lower_dentry, nd);
59 nd->path.dentry = dentry_save;
60 nd->path.mnt = vfsmount_save;
61 if (dentry->d_inode) {
62 struct inode *lower_inode =
63 ecryptfs_inode_to_lower(dentry->d_inode);
65 fsstack_copy_attr_all(dentry->d_inode, lower_inode, NULL);
71 struct kmem_cache *ecryptfs_dentry_info_cache;
75 * @dentry: The ecryptfs dentry
77 * Called when a dentry is really deallocated.
79 static void ecryptfs_d_release(struct dentry *dentry)
81 if (ecryptfs_dentry_to_private(dentry)) {
82 if (ecryptfs_dentry_to_lower(dentry)) {
83 mntput(ecryptfs_dentry_to_lower_mnt(dentry));
84 dput(ecryptfs_dentry_to_lower(dentry));
86 kmem_cache_free(ecryptfs_dentry_info_cache,
87 ecryptfs_dentry_to_private(dentry));
92 struct dentry_operations ecryptfs_dops = {
93 .d_revalidate = ecryptfs_d_revalidate,
94 .d_release = ecryptfs_d_release,