Commit | Line | Data |
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237fead6 MH |
1 | /** |
2 | * eCryptfs: Linux filesystem encryption layer | |
3 | * | |
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> | |
8 | * | |
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. | |
13 | * | |
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. | |
18 | * | |
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 | |
22 | * 02111-1307, USA. | |
23 | */ | |
24 | ||
25 | #include <linux/dcache.h> | |
26 | #include <linux/namei.h> | |
45ec4aba | 27 | #include <linux/mount.h> |
0cc72dc7 | 28 | #include <linux/fs_stack.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
237fead6 MH |
30 | #include "ecryptfs_kernel.h" |
31 | ||
32 | /** | |
33 | * ecryptfs_d_revalidate - revalidate an ecryptfs dentry | |
34 | * @dentry: The ecryptfs dentry | |
35 | * @nd: The associated nameidata | |
36 | * | |
37 | * Called when the VFS needs to revalidate a dentry. This | |
38 | * is called whenever a name lookup finds a dentry in the | |
39 | * dcache. Most filesystems leave this as NULL, because all their | |
40 | * dentries in the dcache are valid. | |
41 | * | |
42 | * Returns 1 if valid, 0 otherwise. | |
43 | * | |
44 | */ | |
45 | static int ecryptfs_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
46 | { | |
34286d66 NP |
47 | struct dentry *lower_dentry; |
48 | struct vfsmount *lower_mnt; | |
70b89021 TH |
49 | struct dentry *dentry_save = NULL; |
50 | struct vfsmount *vfsmount_save = NULL; | |
237fead6 MH |
51 | int rc = 1; |
52 | ||
70b89021 | 53 | if (nd && nd->flags & LOOKUP_RCU) |
34286d66 NP |
54 | return -ECHILD; |
55 | ||
56 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
57 | lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); | |
237fead6 MH |
58 | if (!lower_dentry->d_op || !lower_dentry->d_op->d_revalidate) |
59 | goto out; | |
70b89021 TH |
60 | if (nd) { |
61 | dentry_save = nd->path.dentry; | |
62 | vfsmount_save = nd->path.mnt; | |
63 | nd->path.dentry = lower_dentry; | |
64 | nd->path.mnt = lower_mnt; | |
65 | } | |
237fead6 | 66 | rc = lower_dentry->d_op->d_revalidate(lower_dentry, nd); |
70b89021 TH |
67 | if (nd) { |
68 | nd->path.dentry = dentry_save; | |
69 | nd->path.mnt = vfsmount_save; | |
70 | } | |
ae56fb16 MH |
71 | if (dentry->d_inode) { |
72 | struct inode *lower_inode = | |
73 | ecryptfs_inode_to_lower(dentry->d_inode); | |
74 | ||
9afa2fb6 | 75 | fsstack_copy_attr_all(dentry->d_inode, lower_inode); |
ae56fb16 | 76 | } |
237fead6 MH |
77 | out: |
78 | return rc; | |
79 | } | |
80 | ||
81 | struct kmem_cache *ecryptfs_dentry_info_cache; | |
82 | ||
83 | /** | |
84 | * ecryptfs_d_release | |
85 | * @dentry: The ecryptfs dentry | |
86 | * | |
87 | * Called when a dentry is really deallocated. | |
88 | */ | |
89 | static void ecryptfs_d_release(struct dentry *dentry) | |
90 | { | |
b228b8e5 MH |
91 | if (ecryptfs_dentry_to_private(dentry)) { |
92 | if (ecryptfs_dentry_to_lower(dentry)) { | |
b228b8e5 | 93 | dput(ecryptfs_dentry_to_lower(dentry)); |
5366dc9f | 94 | mntput(ecryptfs_dentry_to_lower_mnt(dentry)); |
b228b8e5 | 95 | } |
237fead6 MH |
96 | kmem_cache_free(ecryptfs_dentry_info_cache, |
97 | ecryptfs_dentry_to_private(dentry)); | |
45ec4aba | 98 | } |
237fead6 MH |
99 | return; |
100 | } | |
101 | ||
5a3fd05a | 102 | const struct dentry_operations ecryptfs_dops = { |
237fead6 MH |
103 | .d_revalidate = ecryptfs_d_revalidate, |
104 | .d_release = ecryptfs_d_release, | |
105 | }; |