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/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#ifndef __LM_INTERFACE_DOT_H__
#define __LM_INTERFACE_DOT_H__


typedef void (*lm_callback_t) (void *ptr, unsigned int type, void *data);

/*
 * lm_mount() flags
 *
 * LM_MFLAG_SPECTATOR
 * GFS is asking to join the filesystem's lockspace, but it doesn't want to
 * modify the filesystem.  The lock module shouldn't assign a journal to the FS
 * mount.  It shouldn't send recovery callbacks to the FS mount.  If the node
 * dies or withdraws, all locks can be wiped immediately.
 *
 * LM_MFLAG_CONV_NODROP
 * Do not allow the dlm to internally resolve conversion deadlocks by demoting
 * the lock to unlocked and then reacquiring it in the requested mode. Instead,
 * it should cancel the request and return LM_OUT_CONV_DEADLK.
 */

#define LM_MFLAG_SPECTATOR	0x00000001
#define LM_MFLAG_CONV_NODROP	0x00000002

/*
 * lm_lockstruct flags
 *
 * LM_LSFLAG_LOCAL
 * The lock_nolock module returns LM_LSFLAG_LOCAL to GFS, indicating that GFS
 * can make single-node optimizations.
 */

#define LM_LSFLAG_LOCAL		0x00000001

/*
 * lm_lockname types
 */

#define LM_TYPE_RESERVED	0x00
#define LM_TYPE_NONDISK		0x01
#define LM_TYPE_INODE		0x02
#define LM_TYPE_RGRP		0x03
#define LM_TYPE_META		0x04
#define LM_TYPE_IOPEN		0x05
#define LM_TYPE_FLOCK		0x06
#define LM_TYPE_PLOCK		0x07
#define LM_TYPE_QUOTA		0x08
#define LM_TYPE_JOURNAL		0x09

/*
 * lm_lock() states
 *
 * SHARED is compatible with SHARED, not with DEFERRED or EX.
 * DEFERRED is compatible with DEFERRED, not with SHARED or EX.
 */

#define LM_ST_UNLOCKED		0
#define LM_ST_EXCLUSIVE		1
#define LM_ST_DEFERRED		2
#define LM_ST_SHARED		3

/*
 * lm_lock() flags
 *
 * LM_FLAG_TRY
 * Don't wait to acquire the lock if it can't be granted immediately.
 *
 * LM_FLAG_TRY_1CB
 * Send one blocking callback if TRY is set and the lock is not granted.
 *
 * LM_FLAG_NOEXP
 * GFS sets this flag on lock requests it makes while doing journal recovery.
 * These special requests should not be blocked due to the recovery like
 * ordinary locks would be.
 *
 * LM_FLAG_ANY
 * A SHARED request may also be granted in DEFERRED, or a DEFERRED request may
 * also be granted in SHARED.  The preferred state is whichever is compatible
 * with other granted locks, or the specified state if no other locks exist.
 *
 * LM_FLAG_PRIORITY
 * Override fairness considerations.  Suppose a lock is held in a shared state
 * and there is a pending request for the deferred state.  A shared lock
 * request with the priority flag would be allowed to bypass the deferred