forked from luck/tmp_suning_uos_patched
34286d6662
Require filesystems be aware of .d_revalidate being called in rcu-walk mode (nd->flags & LOOKUP_RCU). For now do a simple push down, returning -ECHILD from all implementations. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/**
|
|
* eCryptfs: Linux filesystem encryption layer
|
|
*
|
|
* Copyright (C) 1997-2003 Erez Zadok
|
|
* Copyright (C) 2001-2003 Stony Brook University
|
|
* Copyright (C) 2004-2006 International Business Machines Corp.
|
|
* Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of the
|
|
* License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
|
|
* 02111-1307, USA.
|
|
*/
|
|
|
|
#include <linux/dcache.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/fs_stack.h>
|
|
#include <linux/slab.h>
|
|
#include "ecryptfs_kernel.h"
|
|
|
|
/**
|
|
* ecryptfs_d_revalidate - revalidate an ecryptfs dentry
|
|
* @dentry: The ecryptfs dentry
|
|
* @nd: The associated nameidata
|
|
*
|
|
* Called when the VFS needs to revalidate a dentry. This
|
|
* is called whenever a name lookup finds a dentry in the
|
|
* dcache. Most filesystems leave this as NULL, because all their
|
|
* dentries in the dcache are valid.
|
|
*
|
|
* Returns 1 if valid, 0 otherwise.
|
|
*
|
|
*/
|
|
static int ecryptfs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
struct dentry *lower_dentry;
|
|
struct vfsmount *lower_mnt;
|
|
struct dentry *dentry_save;
|
|
struct vfsmount *vfsmount_save;
|
|
int rc = 1;
|
|
|
|
if (nd->flags & LOOKUP_RCU)
|
|
return -ECHILD;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
|
|
if (!lower_dentry->d_op || !lower_dentry->d_op->d_revalidate)
|
|
goto out;
|
|
dentry_save = nd->path.dentry;
|
|
vfsmount_save = nd->path.mnt;
|
|
nd->path.dentry = lower_dentry;
|
|
nd->path.mnt = lower_mnt;
|
|
rc = lower_dentry->d_op->d_revalidate(lower_dentry, nd);
|
|
nd->path.dentry = dentry_save;
|
|
nd->path.mnt = vfsmount_save;
|
|
if (dentry->d_inode) {
|
|
struct inode *lower_inode =
|
|
ecryptfs_inode_to_lower(dentry->d_inode);
|
|
|
|
fsstack_copy_attr_all(dentry->d_inode, lower_inode);
|
|
}
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
struct kmem_cache *ecryptfs_dentry_info_cache;
|
|
|
|
/**
|
|
* ecryptfs_d_release
|
|
* @dentry: The ecryptfs dentry
|
|
*
|
|
* Called when a dentry is really deallocated.
|
|
*/
|
|
static void ecryptfs_d_release(struct dentry *dentry)
|
|
{
|
|
if (ecryptfs_dentry_to_private(dentry)) {
|
|
if (ecryptfs_dentry_to_lower(dentry)) {
|
|
dput(ecryptfs_dentry_to_lower(dentry));
|
|
mntput(ecryptfs_dentry_to_lower_mnt(dentry));
|
|
}
|
|
kmem_cache_free(ecryptfs_dentry_info_cache,
|
|
ecryptfs_dentry_to_private(dentry));
|
|
}
|
|
return;
|
|
}
|
|
|
|
const struct dentry_operations ecryptfs_dops = {
|
|
.d_revalidate = ecryptfs_d_revalidate,
|
|
.d_release = ecryptfs_d_release,
|
|
};
|