fs/ocfs2/dlmglue.h



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/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * dlmglue.h
 *
 * description here
 *
 * 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.
 */


#ifndef DLMGLUE_H
#define DLMGLUE_H

#include "dcache.h"

#define OCFS2_LVB_VERSION 5

struct ocfs2_meta_lvb {
	__u8         lvb_version;
	__u8         lvb_reserved0;
	__be16       lvb_idynfeatures;
	__be32       lvb_iclusters;
	__be32       lvb_iuid;
	__be32       lvb_igid;
	__be64       lvb_iatime_packed;
	__be64       lvb_ictime_packed;
	__be64       lvb_imtime_packed;
	__be64       lvb_isize;
	__be16       lvb_imode;
	__be16       lvb_inlink;
	__be32       lvb_iattr;
	__be32       lvb_igeneration;
	__be32       lvb_reserved2;
};

#define OCFS2_QINFO_LVB_VERSION 1

struct ocfs2_qinfo_lvb {
	__u8	lvb_version;
	__u8	lvb_reserved[3];
	__be32	lvb_bgrace;
	__be32	lvb_igrace;
	__be32	lvb_syncms;
	__be32	lvb_blocks;
	__be32	lvb_free_blk;
	__be32	lvb_free_entry;
};

#define OCFS2_ORPHAN_LVB_VERSION 1

struct ocfs2_orphan_scan_lvb {
	__u8	lvb_version;
	__u8	lvb_reserved[3];
	__be32	lvb_os_seqno;
};

/* ocfs2_inode_lock_full() 'arg_flags' flags */
/* don't wait on recovery. */
#define OCFS2_META_LOCK_RECOVERY	(0x01)
/* Instruct the dlm not to queue ourselves on the other node. */
#define OCFS2_META_LOCK_NOQUEUE		(0x02)
/* don't block waiting for the downconvert thread, instead return -EAGAIN */
#define OCFS2_LOCK_NONBLOCK		(0x04)

/* Locking subclasses of inode cluster lock */
enum {
	OI_LS_NORMAL = 0,
	OI_LS_PARENT,
	OI_LS_RENAME1,
	OI_LS_RENAME2,
};

int ocfs2_dlm_init(struct ocfs2_super *osb);
void ocfs2_dlm_shutdown(struct ocfs2_super *osb, int hangup_pending);
void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res);
void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
			       enum ocfs2_lock_type type,
			       unsigned int generation,
			       struct inode *inode);
void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
				u64 parent, struct inode *inode);
struct ocfs2_file_private;
void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
			      struct ocfs2_file_private *fp);
struct ocfs2_mem_dqinfo;
void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres,
                               struct ocfs2_mem_dqinfo *info);
void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres,
				  struct ocfs2_super *osb, u64 ref_blkno,
				  unsigned int generation);
void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
int ocfs2_create_new_inode_locks(struct inode *inode);
int ocfs2_drop_inode_locks(struct inode *inode);
int ocfs2_rw_lock(struct inode *inode, int write);
void ocfs2_rw_unlock(struct inode *inode, int write);
int ocfs2_open_lock(struct inode *inode);
int ocfs2_try_open_lock(struct inode *inode, int write);