/*****************************************************************************************************************************************************************  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__ */