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/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* dcache.c
*
* dentry cache handling code
*
* Copyright (C) 2002, 2004 Oracle. All rights reserved.
*
* 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 021110-1307, USA.
*/
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/namei.h>
#define MLOG_MASK_PREFIX ML_DCACHE
#include <cluster/masklog.h>
#include "ocfs2.h"
#include "alloc.h"
#include "dcache.h"
#include "file.h"
#include "inode.h"
static int ocfs2_dentry_revalidate(struct dentry *dentry,
struct nameidata *nd)
{
struct inode *inode = dentry->d_inode;
int ret = 0; /* if all else fails, just return false */
struct ocfs2_super *osb;
mlog_entry("(0x%p, '%.*s')\n", dentry,
dentry->d_name.len, dentry->d_name.name);
/* Never trust a negative dentry - force a new lookup. */
if (inode == NULL) {
mlog(0, "negative dentry: %.*s\n", dentry->d_name.len,
dentry->d_name.name);
goto bail;
}
osb = OCFS2_SB(inode->i_sb);
BUG_ON(!osb);
if (inode != osb->root_inode) {
spin_lock(&OCFS2_I(inode)->ip_lock);
/* did we or someone else delete this inode? */
if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
spin_unlock(&OCFS2_I(inode)->ip_lock);
mlog(0, "inode (%llu) deleted, returning false\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno);
goto bail;
}
spin_unlock(&OCFS2_I(inode)->ip_lock);
if (!inode->i_nlink) {
mlog(0, "Inode %llu orphaned, returning false "
"dir = %d\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno,
S_ISDIR(inode->i_mode));
goto bail;
}
}
ret = 1;
bail:
mlog_exit(ret);
return ret;
}
DEFINE_SPINLOCK(dentry_attach_lock);
struct dentry_operations ocfs2_dentry_ops = {
.d_revalidate = ocfs2_dentry_revalidate,
};
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