This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / fs / ecryptfs / dentry.c

diff --git a/fs/ecryptfs/dentry.c b/fs/ecryptfs/dentry.c
new file mode 100644 (file)
index 0000000..329efcd
--- /dev/null
+++ b/fs/ecryptfs/dentry.c
@@ -0,0 +1,100 @@
+/**
+ * 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 "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 = ecryptfs_dentry_to_lower(dentry);
+       struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
+       struct dentry *dentry_save;
+       struct vfsmount *vfsmount_save;
+       int rc = 1;
+
+       if (!lower_dentry->d_op || !lower_dentry->d_op->d_revalidate)
+               goto out;
+       dentry_save = nd->dentry;
+       vfsmount_save = nd->mnt;
+       nd->dentry = lower_dentry;
+       nd->mnt = lower_mnt;
+       rc = lower_dentry->d_op->d_revalidate(lower_dentry, nd);
+       nd->dentry = dentry_save;
+       nd->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, NULL);
+       }
+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)
+{
+       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) {
+               struct vfsmount *lower_mnt =
+                       ecryptfs_dentry_to_lower_mnt(dentry);
+
+               mntput(lower_mnt);
+               dput(lower_dentry);
+       }
+       return;
+}
+
+struct dentry_operations ecryptfs_dops = {
+       .d_revalidate = ecryptfs_d_revalidate,
+       .d_release = ecryptfs_d_release,
+};