mirror of
https://github.com/torvalds/linux
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92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* dcache.c
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*
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* dentry cache handling code
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*
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* Copyright (C) 2002, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/namei.h>
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#define MLOG_MASK_PREFIX ML_DCACHE
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "dcache.h"
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#include "file.h"
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#include "inode.h"
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static int ocfs2_dentry_revalidate(struct dentry *dentry,
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struct nameidata *nd)
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{
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struct inode *inode = dentry->d_inode;
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int ret = 0; /* if all else fails, just return false */
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struct ocfs2_super *osb;
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mlog_entry("(0x%p, '%.*s')\n", dentry,
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dentry->d_name.len, dentry->d_name.name);
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/* Never trust a negative dentry - force a new lookup. */
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if (inode == NULL) {
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mlog(0, "negative dentry: %.*s\n", dentry->d_name.len,
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dentry->d_name.name);
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goto bail;
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}
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osb = OCFS2_SB(inode->i_sb);
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BUG_ON(!osb);
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if (inode != osb->root_inode) {
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spin_lock(&OCFS2_I(inode)->ip_lock);
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/* did we or someone else delete this inode? */
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if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
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spin_unlock(&OCFS2_I(inode)->ip_lock);
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mlog(0, "inode (%llu) deleted, returning false\n",
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(unsigned long long)OCFS2_I(inode)->ip_blkno);
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goto bail;
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}
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spin_unlock(&OCFS2_I(inode)->ip_lock);
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if (!inode->i_nlink) {
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mlog(0, "Inode %llu orphaned, returning false "
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"dir = %d\n",
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(unsigned long long)OCFS2_I(inode)->ip_blkno,
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S_ISDIR(inode->i_mode));
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goto bail;
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}
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}
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ret = 1;
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bail:
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mlog_exit(ret);
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return ret;
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}
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struct dentry_operations ocfs2_dentry_ops = {
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.d_revalidate = ocfs2_dentry_revalidate,
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};
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