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dlmconstants.h
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/****************************************************************************** ******************************************************************************* ** ** 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 * * Acquire an orphan lock. * * 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__ */