[net-next-2.6.git] / include / linux / dlmconstants.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__ */
Commit	Line	Data
d69a3ad6 JB	1	/******************************************************************************
	2	*******************************************************************************
	3	**
	4	** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
	5	** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
	6	**
	7	** This copyrighted material is made available to anyone wishing to use,
	8	** modify, copy, or redistribute it subject to the terms and conditions
	9	** of the GNU General Public License v.2.
	10	**
	11	*******************************************************************************
	12	******************************************************************************/
	13
	14	#ifndef __DLMCONSTANTS_DOT_H__
	15	#define __DLMCONSTANTS_DOT_H__
	16
	17	/*
	18	* Constants used by DLM interface.
	19	*/
	20
3d564fa3 DT	21	#define DLM_LOCKSPACE_LEN 64
	22	#define DLM_RESNAME_MAXLEN 64
	23
	24
d69a3ad6 JB	25	/*
	26	* Lock Modes
	27	*/
	28
	29	#define DLM_LOCK_IV (-1) /* invalid */
	30	#define DLM_LOCK_NL 0 /* null */
	31	#define DLM_LOCK_CR 1 /* concurrent read */
	32	#define DLM_LOCK_CW 2 /* concurrent write */
	33	#define DLM_LOCK_PR 3 /* protected read */
	34	#define DLM_LOCK_PW 4 /* protected write */
	35	#define DLM_LOCK_EX 5 /* exclusive */
	36
	37
	38	/*
	39	* Flags to dlm_lock
	40	*
	41	* DLM_LKF_NOQUEUE
	42	*
	43	* Do not queue the lock request on the wait queue if it cannot be granted
	44	* immediately. If the lock cannot be granted because of this flag, DLM will
	45	* either return -EAGAIN from the dlm_lock call or will return 0 from
	46	* dlm_lock and -EAGAIN in the lock status block when the AST is executed.
	47	*
	48	* DLM_LKF_CANCEL
	49	*
	50	* Used to cancel a pending lock request or conversion. A converting lock is
	51	* returned to its previously granted mode.
	52	*
	53	* DLM_LKF_CONVERT
	54	*
	55	* Indicates a lock conversion request. For conversions the name and namelen
	56	* are ignored and the lock ID in the LKSB is used to identify the lock.
	57	*
	58	* DLM_LKF_VALBLK
	59	*
	60	* Requests DLM to return the current contents of the lock value block in the
	61	* lock status block. When this flag is set in a lock conversion from PW or EX
	62	* modes, DLM assigns the value specified in the lock status block to the lock
	63	* value block of the lock resource. The LVB is a DLM_LVB_LEN size array
	64	* containing application-specific information.
	65	*
	66	* DLM_LKF_QUECVT
	67	*
	68	* Force a conversion request to be queued, even if it is compatible with
	69	* the granted modes of other locks on the same resource.
	70	*
	71	* DLM_LKF_IVVALBLK
	72	*
	73	* Invalidate the lock value block.
	74	*
	75	* DLM_LKF_CONVDEADLK
	76	*
	77	* Allows the dlm to resolve conversion deadlocks internally by demoting the
	78	* granted mode of a converting lock to NL. The DLM_SBF_DEMOTED flag is
	79	* returned for a conversion that's been effected by this.
	80	*
	81	* DLM_LKF_PERSISTENT
	82	*
	83	* Only relevant to locks originating in userspace. A persistent lock will not
	84	* be removed if the process holding the lock exits.
	85	*
	86	* DLM_LKF_NODLCKWT
	87	*
	88	* Do not cancel the lock if it gets into conversion deadlock.
89	* Exclude this lock from being monitored due to DLM_LSFL_TIMEWARN.
90	*
91	* DLM_LKF_NODLCKBLK
92	*
93	* net yet implemented
94	*
95	* DLM_LKF_EXPEDITE
96	*
97	* Used only with new requests for NL mode locks. Tells the lock manager
98	* to grant the lock, ignoring other locks in convert and wait queues.
99	*
100	* DLM_LKF_NOQUEUEBAST
101	*
102	* Send blocking AST's before returning -EAGAIN to the caller. It is only
103	* used along with the NOQUEUE flag. Blocking AST's are not sent for failed
104	* NOQUEUE requests otherwise.
105	*
106	* DLM_LKF_HEADQUE
107	*
108	* Add a lock to the head of the convert or wait queue rather than the tail.
109	*
110	* DLM_LKF_NOORDER
111	*
112	* Disregard the standard grant order rules and grant a lock as soon as it
113	* is compatible with other granted locks.
114	*
115	* DLM_LKF_ORPHAN
116	*
117	* not yet implemented
118	*
119	* DLM_LKF_ALTPR
120	*
121	* If the requested mode cannot be granted immediately, try to grant the lock
122	* in PR mode instead. If this alternate mode is granted instead of the
123	* requested mode, DLM_SBF_ALTMODE is returned in the lksb.
124	*
125	* DLM_LKF_ALTCW
126	*
127	* The same as ALTPR, but the alternate mode is CW.
128	*
129	* DLM_LKF_FORCEUNLOCK
130	*
131	* Unlock the lock even if it is converting or waiting or has sublocks.
132	* Only really for use by the userland device.c code.
133	*
134	*/
135
136	#define DLM_LKF_NOQUEUE 0x00000001
137	#define DLM_LKF_CANCEL 0x00000002
138	#define DLM_LKF_CONVERT 0x00000004
139	#define DLM_LKF_VALBLK 0x00000008
140	#define DLM_LKF_QUECVT 0x00000010
141	#define DLM_LKF_IVVALBLK 0x00000020
142	#define DLM_LKF_CONVDEADLK 0x00000040
143	#define DLM_LKF_PERSISTENT 0x00000080
144	#define DLM_LKF_NODLCKWT 0x00000100
145	#define DLM_LKF_NODLCKBLK 0x00000200
146	#define DLM_LKF_EXPEDITE 0x00000400
147	#define DLM_LKF_NOQUEUEBAST 0x00000800
148	#define DLM_LKF_HEADQUE 0x00001000
149	#define DLM_LKF_NOORDER 0x00002000
150	#define DLM_LKF_ORPHAN 0x00004000
151	#define DLM_LKF_ALTPR 0x00008000
152	#define DLM_LKF_ALTCW 0x00010000
153	#define DLM_LKF_FORCEUNLOCK 0x00020000
154	#define DLM_LKF_TIMEOUT 0x00040000
155
156	/*
157	* Some return codes that are not in errno.h
158	*/
159
160	#define DLM_ECANCEL 0x10001
161	#define DLM_EUNLOCK 0x10002
162
163	#endif /* __DLMCONSTANTS_DOT_H__ */