Messages in this thread Patch in this message | | | Date | Wed, 2 Nov 2005 20:53:11 -0700 | From | Phillip Hellewell <> | Subject | [PATCH 8/12: eCryptfs] Dentry operations |
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eCryptfs dentry operations.
Signed off by: Phillip Hellewell <phillip@hellewell.homeip.net> Signed off by: Michael Halcrow <mhalcrow@us.ibm.com> Signed off by: Michael Thompson <mmcthomps@us.ibm.com> Signed off by: Kent Yoder <yoder1@us.ibm.com>
dentry.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 110 insertions(+) --- linux-2.6.14-rc5-mm1/fs/ecryptfs/dentry.c 1969-12-31 18:00:00.000000000 -0600 +++ linux-2.6.14-rc5-mm1-ecryptfs/fs/ecryptfs/dentry.c 2005-11-01 14:40:09.000000000 -0600 @@ -0,0 +1,110 @@ +/** + * eCryptfs: Linux filesystem encryption layer + * + * Copyright (c) 1997-2003 Erez Zadok + * Copyright (c) 2001-2003 Stony Brook University + * Copyright (c) 2005 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. + */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif /* HAVE_CONFIG_H */ +#include <linux/dcache.h> +#include <linux/namei.h> +#include "ecryptfs_kernel.h" + +/** + * 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. + * + * + * @param dentry ecryptfs dentry + * @param nd + * @return 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; + ecryptfs_printk(1, KERN_NOTICE, "Enter; dentry->d_name.name = [%s]\n", + dentry->d_name.name); + lower_dentry = ecryptfs_lower_dentry(dentry); + if (!lower_dentry) { + err = 0; + goto out; + } + if (!lower_dentry->d_op || !lower_dentry->d_op->d_revalidate) + goto out; + /* Call the lower dentry's d_revalidate (assuming it has one) */ + saved_dentry = nd->dentry; + saved_vfsmount = nd->mnt; + nd->dentry = lower_dentry; + nd->mnt = 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: + ecryptfs_printk(1, KERN_NOTICE, "Exit; err = [%d]\n", err); + return err; +} + +kmem_cache_t *ecryptfs_dentry_info_cache; + +/* Notes: + * Called when a dentry is really deallocated + * Sanity check? wrapper around ecryptfs_dput() + */ +static void ecryptfs_d_release(struct dentry *dentry) +{ + struct dentry *lower_dentry; + ecryptfs_printk(1, KERN_NOTICE, "Enter; dentry->d_name->name = [%s]\n", + dentry->d_name.name); + if (!dentry) { + ecryptfs_printk(0, KERN_ERR, "NULL dentry\n"); + goto out; + } + if (!DENTRY_TO_PRIVATE(dentry)) { + ecryptfs_printk(1, KERN_ERR, "dentry without private data: " + "[%*s]\n", dentry->d_name.len, + dentry->d_name.name); + goto out; + } + lower_dentry = DENTRY_TO_LOWER(dentry); + /* TODO: Why do we look for an inode here? We should be + * freeing regardless */ + /* OLD: if (lower_dentry && lower_dentry->d_inode) { */ + if (DENTRY_TO_PRIVATE(dentry)) { + ecryptfs_kmem_cache_free(ecryptfs_dentry_info_cache, + DENTRY_TO_PRIVATE(dentry)); + } + if (lower_dentry) + ecryptfs_dput(lower_dentry); +out: + ecryptfs_printk(1, KERN_NOTICE, "Exit\n"); + return; +} + +struct dentry_operations ecryptfs_dops = { + .d_revalidate = ecryptfs_d_revalidate, + .d_release = ecryptfs_d_release, +}; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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