include/linux/dlmconstants.h - kernel/skids - Git at Google

 /******************************************************************************
 *******************************************************************************
 **
 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
 **  Copyright (C) 2004-2007 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 v.2.
 **
 *******************************************************************************
 ******************************************************************************/

 #ifndef __DLMCONSTANTS_DOT_H__
 #define __DLMCONSTANTS_DOT_H__

 /*
  * Constants used by DLM interface.
  */

 #define DLM_LOCKSPACE_LEN       64
 #define DLM_RESNAME_MAXLEN      64


 /*
  * Lock Modes
  */

 #define DLM_LOCK_IV		(-1)	/* invalid */
 #define DLM_LOCK_NL		0	/* null */
 #define DLM_LOCK_CR		1	/* concurrent read */
 #define DLM_LOCK_CW		2	/* concurrent write */
 #define DLM_LOCK_PR		3	/* protected read */
 #define DLM_LOCK_PW		4	/* protected write */
 #define DLM_LOCK_EX		5	/* exclusive */


 /*
  * Flags to dlm_lock
  *
  * DLM_LKF_NOQUEUE
  *
  * Do not queue the lock request on the wait queue if it cannot be granted
  * immediately.  If the lock cannot be granted because of this flag, DLM will
  * either return -EAGAIN from the dlm_lock call or will return 0 from
  * dlm_lock and -EAGAIN in the lock status block when the AST is executed.
  *
  * DLM_LKF_CANCEL
  *
  * Used to cancel a pending lock request or conversion.  A converting lock is
  * returned to its previously granted mode.
  *
  * DLM_LKF_CONVERT
  *
  * Indicates a lock conversion request.  For conversions the name and namelen
  * are ignored and the lock ID in the LKSB is used to identify the lock.
  *
  * DLM_LKF_VALBLK
  *
  * Requests DLM to return the current contents of the lock value block in the
  * lock status block.  When this flag is set in a lock conversion from PW or EX
  * modes, DLM assigns the value specified in the lock status block to the lock
  * value block of the lock resource.  The LVB is a DLM_LVB_LEN size array
  * containing application-specific information.
  *
  * DLM_LKF_QUECVT
  *
  * Force a conversion request to be queued, even if it is compatible with
  * the granted modes of other locks on the same resource.
  *
  * DLM_LKF_IVVALBLK
  *
  * Invalidate the lock value block.
  *
  * DLM_LKF_CONVDEADLK
  *
  * Allows the dlm to resolve conversion deadlocks internally by demoting the
  * granted mode of a converting lock to NL.  The DLM_SBF_DEMOTED flag is
  * returned for a conversion that's been effected by this.
  *
  * DLM_LKF_PERSISTENT
  *
  * Only relevant to locks originating in userspace.  A persistent lock will not
  * be removed if the process holding the lock exits.
  *
  * DLM_LKF_NODLCKWT
  *
  * Do not cancel the lock if it gets into conversion deadlock.
  * Exclude this lock from being monitored due to DLM_LSFL_TIMEWARN.
  *
  * DLM_LKF_NODLCKBLK
  *
  * net yet implemented
  *
  * DLM_LKF_EXPEDITE
  *
  * Used only with new requests for NL mode locks.  Tells the lock manager
  * to grant the lock, ignoring other locks in convert and wait queues.
  *
  * DLM_LKF_NOQUEUEBAST
  *
  * Send blocking AST's before returning -EAGAIN to the caller.  It is only
  * used along with the NOQUEUE flag.  Blocking AST's are not sent for failed
  * NOQUEUE requests otherwise.
  *
  * DLM_LKF_HEADQUE
  *
  * Add a lock to the head of the convert or wait queue rather than the tail.
  *
  * DLM_LKF_NOORDER
  *
  * Disregard the standard grant order rules and grant a lock as soon as it
  * is compatible with other granted locks.
  *
  * DLM_LKF_ORPHAN
  *
  * not yet implemented
  *
  * DLM_LKF_ALTPR
  *
  * If the requested mode cannot be granted immediately, try to grant the lock
  * in PR mode instead.  If this alternate mode is granted instead of the
  * requested mode, DLM_SBF_ALTMODE is returned in the lksb.
  *
  * DLM_LKF_ALTCW
  *
  * The same as ALTPR, but the alternate mode is CW.
  *
  * DLM_LKF_FORCEUNLOCK
  *
  * Unlock the lock even if it is converting or waiting or has sublocks.
  * Only really for use by the userland device.c code.
  *
  */

 #define DLM_LKF_NOQUEUE		0x00000001
 #define DLM_LKF_CANCEL		0x00000002
 #define DLM_LKF_CONVERT		0x00000004
 #define DLM_LKF_VALBLK		0x00000008
 #define DLM_LKF_QUECVT		0x00000010
 #define DLM_LKF_IVVALBLK	0x00000020
 #define DLM_LKF_CONVDEADLK	0x00000040
 #define DLM_LKF_PERSISTENT	0x00000080
 #define DLM_LKF_NODLCKWT	0x00000100
 #define DLM_LKF_NODLCKBLK	0x00000200
 #define DLM_LKF_EXPEDITE	0x00000400
 #define DLM_LKF_NOQUEUEBAST	0x00000800
 #define DLM_LKF_HEADQUE		0x00001000
 #define DLM_LKF_NOORDER		0x00002000
 #define DLM_LKF_ORPHAN		0x00004000
 #define DLM_LKF_ALTPR		0x00008000
 #define DLM_LKF_ALTCW		0x00010000
 #define DLM_LKF_FORCEUNLOCK	0x00020000
 #define DLM_LKF_TIMEOUT		0x00040000

 /*
  * Some return codes that are not in errno.h
  */

 #define DLM_ECANCEL		0x10001
 #define DLM_EUNLOCK		0x10002

 #endif  /* __DLMCONSTANTS_DOT_H__ */
	/******************************************************************************
	*******************************************************************************
	**
	** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
	** Copyright (C) 2004-2007 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 v.2.
	**
	*******************************************************************************
	******************************************************************************/

	#ifndef __DLMCONSTANTS_DOT_H__
	#define __DLMCONSTANTS_DOT_H__

	/*
	* Constants used by DLM interface.
	*/

	#define DLM_LOCKSPACE_LEN 64
	#define DLM_RESNAME_MAXLEN 64


	/*
	* Lock Modes
	*/

	#define DLM_LOCK_IV (-1) /* invalid */
	#define DLM_LOCK_NL 0 /* null */
	#define DLM_LOCK_CR 1 /* concurrent read */
	#define DLM_LOCK_CW 2 /* concurrent write */
	#define DLM_LOCK_PR 3 /* protected read */
	#define DLM_LOCK_PW 4 /* protected write */
	#define DLM_LOCK_EX 5 /* exclusive */


	/*
	* Flags to dlm_lock
	*
	* DLM_LKF_NOQUEUE
	*
	* Do not queue the lock request on the wait queue if it cannot be granted
	* immediately. If the lock cannot be granted because of this flag, DLM will
	* either return -EAGAIN from the dlm_lock call or will return 0 from
	* dlm_lock and -EAGAIN in the lock status block when the AST is executed.
	*
	* DLM_LKF_CANCEL
	*
	* Used to cancel a pending lock request or conversion. A converting lock is
	* returned to its previously granted mode.
	*
	* DLM_LKF_CONVERT
	*
	* Indicates a lock conversion request. For conversions the name and namelen
	* are ignored and the lock ID in the LKSB is used to identify the lock.
	*
	* DLM_LKF_VALBLK
	*
	* Requests DLM to return the current contents of the lock value block in the
	* lock status block. When this flag is set in a lock conversion from PW or EX
	* modes, DLM assigns the value specified in the lock status block to the lock
	* value block of the lock resource. The LVB is a DLM_LVB_LEN size array
	* containing application-specific information.
	*
	* DLM_LKF_QUECVT
	*
	* Force a conversion request to be queued, even if it is compatible with
	* the granted modes of other locks on the same resource.
	*
	* DLM_LKF_IVVALBLK
	*
	* Invalidate the lock value block.
	*
	* DLM_LKF_CONVDEADLK
	*
	* Allows the dlm to resolve conversion deadlocks internally by demoting the
	* granted mode of a converting lock to NL. The DLM_SBF_DEMOTED flag is
	* returned for a conversion that's been effected by this.
	*
	* DLM_LKF_PERSISTENT
	*
	* Only relevant to locks originating in userspace. A persistent lock will not
	* be removed if the process holding the lock exits.
	*
	* DLM_LKF_NODLCKWT
	*
	* Do not cancel the lock if it gets into conversion deadlock.
	* Exclude this lock from being monitored due to DLM_LSFL_TIMEWARN.
	*
	* DLM_LKF_NODLCKBLK
	*
	* net yet implemented
	*
	* DLM_LKF_EXPEDITE
	*
	* Used only with new requests for NL mode locks. Tells the lock manager
	* to grant the lock, ignoring other locks in convert and wait queues.
	*
	* DLM_LKF_NOQUEUEBAST
	*
	* Send blocking AST's before returning -EAGAIN to the caller. It is only
	* used along with the NOQUEUE flag. Blocking AST's are not sent for failed
	* NOQUEUE requests otherwise.
	*
	* DLM_LKF_HEADQUE
	*
	* Add a lock to the head of the convert or wait queue rather than the tail.
	*
	* DLM_LKF_NOORDER
	*
	* Disregard the standard grant order rules and grant a lock as soon as it
	* is compatible with other granted locks.
	*
	* DLM_LKF_ORPHAN
	*
	* not yet implemented
	*
	* DLM_LKF_ALTPR
	*
	* If the requested mode cannot be granted immediately, try to grant the lock
	* in PR mode instead. If this alternate mode is granted instead of the
	* requested mode, DLM_SBF_ALTMODE is returned in the lksb.
	*
	* DLM_LKF_ALTCW
	*
	* The same as ALTPR, but the alternate mode is CW.
	*
	* DLM_LKF_FORCEUNLOCK
	*
	* Unlock the lock even if it is converting or waiting or has sublocks.
	* Only really for use by the userland device.c code.
	*
	*/

	#define DLM_LKF_NOQUEUE 0x00000001
	#define DLM_LKF_CANCEL 0x00000002
	#define DLM_LKF_CONVERT 0x00000004
	#define DLM_LKF_VALBLK 0x00000008
	#define DLM_LKF_QUECVT 0x00000010
	#define DLM_LKF_IVVALBLK 0x00000020
	#define DLM_LKF_CONVDEADLK 0x00000040
	#define DLM_LKF_PERSISTENT 0x00000080
	#define DLM_LKF_NODLCKWT 0x00000100
	#define DLM_LKF_NODLCKBLK 0x00000200
	#define DLM_LKF_EXPEDITE 0x00000400
	#define DLM_LKF_NOQUEUEBAST 0x00000800
	#define DLM_LKF_HEADQUE 0x00001000
	#define DLM_LKF_NOORDER 0x00002000
	#define DLM_LKF_ORPHAN 0x00004000
	#define DLM_LKF_ALTPR 0x00008000
	#define DLM_LKF_ALTCW 0x00010000
	#define DLM_LKF_FORCEUNLOCK 0x00020000
	#define DLM_LKF_TIMEOUT 0x00040000

	/*
	* Some return codes that are not in errno.h
	*/

	#define DLM_ECANCEL 0x10001
	#define DLM_EUNLOCK 0x10002

	#endif /* __DLMCONSTANTS_DOT_H__ */