Commit | Line | Data |
---|---|---|
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 | |
0b728e19 | 35 | * @flags: lookup flags |
237fead6 MH |
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 | */ | |
0b728e19 | 45 | static int ecryptfs_d_revalidate(struct dentry *dentry, unsigned int flags) |
237fead6 | 46 | { |
34286d66 NP |
47 | struct dentry *lower_dentry; |
48 | struct vfsmount *lower_mnt; | |
237fead6 MH |
49 | int rc = 1; |
50 | ||
0b728e19 | 51 | if (flags & LOOKUP_RCU) |
34286d66 NP |
52 | return -ECHILD; |
53 | ||
54 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
55 | lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); | |
237fead6 MH |
56 | if (!lower_dentry->d_op || !lower_dentry->d_op->d_revalidate) |
57 | goto out; | |
0b728e19 | 58 | rc = lower_dentry->d_op->d_revalidate(lower_dentry, flags); |
ae56fb16 MH |
59 | if (dentry->d_inode) { |
60 | struct inode *lower_inode = | |
61 | ecryptfs_inode_to_lower(dentry->d_inode); | |
62 | ||
9afa2fb6 | 63 | fsstack_copy_attr_all(dentry->d_inode, lower_inode); |
ae56fb16 | 64 | } |
237fead6 MH |
65 | out: |
66 | return rc; | |
67 | } | |
68 | ||
69 | struct kmem_cache *ecryptfs_dentry_info_cache; | |
70 | ||
71 | /** | |
72 | * ecryptfs_d_release | |
73 | * @dentry: The ecryptfs dentry | |
74 | * | |
75 | * Called when a dentry is really deallocated. | |
76 | */ | |
77 | static void ecryptfs_d_release(struct dentry *dentry) | |
78 | { | |
b228b8e5 MH |
79 | if (ecryptfs_dentry_to_private(dentry)) { |
80 | if (ecryptfs_dentry_to_lower(dentry)) { | |
b228b8e5 | 81 | dput(ecryptfs_dentry_to_lower(dentry)); |
5366dc9f | 82 | mntput(ecryptfs_dentry_to_lower_mnt(dentry)); |
b228b8e5 | 83 | } |
237fead6 MH |
84 | kmem_cache_free(ecryptfs_dentry_info_cache, |
85 | ecryptfs_dentry_to_private(dentry)); | |
45ec4aba | 86 | } |
237fead6 MH |
87 | return; |
88 | } | |
89 | ||
5a3fd05a | 90 | const struct dentry_operations ecryptfs_dops = { |
237fead6 MH |
91 | .d_revalidate = ecryptfs_d_revalidate, |
92 | .d_release = ecryptfs_d_release, | |
93 | }; |