projects / linux-2.6-block.git / blame
| 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> | |
| 27 | #include "ecryptfs_kernel.h" | |
| 28 | ||
| 29 | /** | |
| 30 | * ecryptfs_d_revalidate - revalidate an ecryptfs dentry | |
| 31 | * @dentry: The ecryptfs dentry | |
| 32 | * @nd: The associated nameidata | |
| 33 | * | |
| 34 | * Called when the VFS needs to revalidate a dentry. This | |
| 35 | * is called whenever a name lookup finds a dentry in the | |
| 36 | * dcache. Most filesystems leave this as NULL, because all their | |
| 37 | * dentries in the dcache are valid. | |
| 38 | * | |
| 39 | * Returns 1 if valid, 0 otherwise. | |
| 40 | * | |
| 41 | */ | |
| 42 | static int ecryptfs_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
| 43 | { | |
| 44 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
| 45 | struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); | |
| 46 | struct dentry *dentry_save; | |
| 47 | struct vfsmount *vfsmount_save; | |
| 48 | int rc = 1; | |
| 49 | ||
| 50 | if (!lower_dentry->d_op || !lower_dentry->d_op->d_revalidate) | |
| 51 | goto out; | |
| 52 | dentry_save = nd->dentry; | |
| 53 | vfsmount_save = nd->mnt; | |
| 54 | nd->dentry = lower_dentry; | |
| 55 | nd->mnt = lower_mnt; | |
| 56 | rc = lower_dentry->d_op->d_revalidate(lower_dentry, nd); | |
| 57 | nd->dentry = dentry_save; | |
| 58 | nd->mnt = vfsmount_save; | |
| 59 | out: | |
| 60 | return rc; | |
| 61 | } | |
| 62 | ||
| 63 | struct kmem_cache *ecryptfs_dentry_info_cache; | |
| 64 | ||
| 65 | /** | |
| 66 | * ecryptfs_d_release | |
| 67 | * @dentry: The ecryptfs dentry | |
| 68 | * | |
| 69 | * Called when a dentry is really deallocated. | |
| 70 | */ | |
| 71 | static void ecryptfs_d_release(struct dentry *dentry) | |
| 72 | { | |
| 73 | struct dentry *lower_dentry; | |
| 74 | ||
| 75 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
| 76 | if (ecryptfs_dentry_to_private(dentry)) | |
| 77 | kmem_cache_free(ecryptfs_dentry_info_cache, | |
| 78 | ecryptfs_dentry_to_private(dentry)); | |
| 79 | if (lower_dentry) | |
| 80 | dput(lower_dentry); | |
| 81 | return; | |
| 82 | } | |
| 83 | ||
| 84 | struct dentry_operations ecryptfs_dops = { | |
| 85 | .d_revalidate = ecryptfs_d_revalidate, | |
| 86 | .d_release = ecryptfs_d_release, | |
| 87 | }; |