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80c05846f6
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 higher level API and the dentry manipulation code. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
129 lines
3.1 KiB
C
129 lines
3.1 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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* sysfile.c
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*
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* Initialize, read, write, etc. system files.
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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/highmem.h>
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#define MLOG_MASK_PREFIX ML_INODE
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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 "dir.h"
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#include "inode.h"
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#include "journal.h"
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#include "sysfile.h"
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#include "buffer_head_io.h"
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static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
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int type,
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u32 slot);
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static inline int is_global_system_inode(int type);
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static inline int is_in_system_inode_array(struct ocfs2_super *osb,
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int type,
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u32 slot);
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static inline int is_global_system_inode(int type)
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{
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return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE &&
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type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE;
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}
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static inline int is_in_system_inode_array(struct ocfs2_super *osb,
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int type,
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u32 slot)
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{
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return slot == osb->slot_num || is_global_system_inode(type);
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}
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struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb,
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int type,
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u32 slot)
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{
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struct inode *inode = NULL;
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struct inode **arr = NULL;
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/* avoid the lookup if cached in local system file array */
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if (is_in_system_inode_array(osb, type, slot))
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arr = &(osb->system_inodes[type]);
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if (arr && ((inode = *arr) != NULL)) {
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/* get a ref in addition to the array ref */
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inode = igrab(inode);
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BUG_ON(!inode);
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return inode;
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}
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/* this gets one ref thru iget */
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inode = _ocfs2_get_system_file_inode(osb, type, slot);
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/* add one more if putting into array for first time */
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if (arr && inode) {
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*arr = igrab(inode);
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BUG_ON(!*arr);
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}
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return inode;
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}
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static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
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int type,
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u32 slot)
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{
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char namebuf[40];
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struct inode *inode = NULL;
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u64 blkno;
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struct buffer_head *dirent_bh = NULL;
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struct ocfs2_dir_entry *de = NULL;
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int status = 0;
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ocfs2_sprintf_system_inode_name(namebuf,
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sizeof(namebuf),
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type, slot);
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status = ocfs2_find_files_on_disk(namebuf, strlen(namebuf),
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&blkno, osb->sys_root_inode,
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&dirent_bh, &de);
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if (status < 0) {
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goto bail;
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}
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inode = ocfs2_iget(osb, blkno);
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if (IS_ERR(inode)) {
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mlog_errno(PTR_ERR(inode));
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inode = NULL;
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goto bail;
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}
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bail:
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if (dirent_bh)
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brelse(dirent_bh);
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return inode;
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}
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