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    Subject[PATCH 7/13: eCryptfs] Dentry operations
    This is the 7th patch in a series of 13 constituting the kernel
    components of the eCryptfs cryptographic filesystem.

    eCryptfs dentry operations.

    Signed-off-by: Phillip Hellewell <phillip@hellewell.homeip.net>
    Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>

    ---

    dentry.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 91 insertions(+)

    Index: linux-2.6.17-rc3-mm1-ecryptfs/fs/ecryptfs/dentry.c
    ===================================================================
    --- /dev/null 1970-01-01 00:00:00.000000000 +0000
    +++ linux-2.6.17-rc3-mm1-ecryptfs/fs/ecryptfs/dentry.c 2006-05-12 20:00:26.000000000 -0600
    @@ -0,0 +1,91 @@
    +/**
    + * 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 "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)
    +{
    + int err = 1;
    + struct dentry *lower_dentry;
    + struct dentry *saved_dentry;
    + struct vfsmount *saved_vfsmount;
    +
    + lower_dentry = ecryptfs_dentry_to_lower(dentry);
    + if (!lower_dentry) {
    + err = 0;
    + goto out;
    + }
    + if (!lower_dentry->d_op || !lower_dentry->d_op->d_revalidate)
    + goto out;
    + saved_dentry = nd->dentry;
    + saved_vfsmount = nd->mnt;
    + nd->dentry = lower_dentry;
    + nd->mnt = ecryptfs_superblock_to_private(dentry->d_sb)->lower_mnt;
    + err = lower_dentry->d_op->d_revalidate(lower_dentry, nd);
    + nd->dentry = saved_dentry;
    + nd->mnt = saved_vfsmount;
    +out:
    + return err;
    +}
    +
    +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)
    +{
    + struct dentry *lower_dentry;
    +
    + lower_dentry = ecryptfs_dentry_to_lower(dentry);
    + if (ecryptfs_dentry_to_private(dentry))
    + kmem_cache_free(ecryptfs_dentry_info_cache,
    + ecryptfs_dentry_to_private(dentry));
    + if (lower_dentry)
    + dput(lower_dentry);
    + return;
    +}
    +
    +struct dentry_operations ecryptfs_dops = {
    + .d_revalidate = ecryptfs_d_revalidate,
    + .d_release = ecryptfs_d_release,
    +};
    -
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