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d680efe9d8
Replace the dentry vote mechanism with a cluster lock which covers a set of dentries. This allows us to force d_delete() only on nodes which actually care about an unlink. Every node that does a ->lookup() gets a read only lock on the dentry, until an unlink during which the unlinking node, will request an exclusive lock, forcing the other nodes who care about that dentry to d_delete() it. The effect is that we retain a very lightweight ->d_revalidate(), and at the same time get to make large improvements to the average case performance of the ocfs2 unlink and rename operations. This patch adds the cluster lock type which OCFS2 can attach to dentries. A small number of fs/ocfs2/dcache.c functions are stubbed out so that this change can compile. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
95 lines
2.4 KiB
C
95 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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DEFINE_SPINLOCK(dentry_attach_lock);
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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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