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Edit File : dlm.h \| Size : 2.49 KB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / /*************************************************************************** *************************************************************************** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. Copyright (C) 2004-2011 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 __DLM_DOT_H__ #define __DLM_DOT_H__ / * Interface to Distributed Lock Manager (DLM) * routines and structures to use DLM lockspaces / / Lock levels and flags are here / #include <linux/dlmconstants.h> #include <linux/types.h> typedef void dlm_lockspace_t; / * Lock status block * * Use this structure to specify the contents of the lock value block. For a * conversion request, this structure is used to specify the lock ID of the * lock. DLM writes the status of the lock request and the lock ID assigned * to the request in the lock status block. * * sb_lkid: the returned lock ID. It is set on new (non-conversion) requests. * It is available when dlm_lock returns. * * sb_lvbptr: saves or returns the contents of the lock's LVB according to rules * shown for the DLM_LKF_VALBLK flag. * * sb_flags: DLM_SBF_DEMOTED is returned if in the process of promoting a lock, * it was first demoted to NL to avoid conversion deadlock. * DLM_SBF_VALNOTVALID is returned if the resource's LVB is marked invalid. * * sb_status: the returned status of the lock request set prior to AST * execution. Possible return values: * * 0 if lock request was successful * -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE * -DLM_EUNLOCK if unlock request was successful * -DLM_ECANCEL if a cancel completed successfully * -EDEADLK if a deadlock was detected * -ETIMEDOUT if the lock request was canceled due to a timeout / #define DLM_SBF_DEMOTED 0x01 #define DLM_SBF_VALNOTVALID 0x02 #define DLM_SBF_ALTMODE 0x04 struct dlm_lksb { int sb_status; __u32 sb_lkid; char sb_flags; char sb_lvbptr; }; /* dlm_new_lockspace() flags / #define DLM_LSFL_TIMEWARN 0x00000002 #define DLM_LSFL_FS 0x00000004 #define DLM_LSFL_NEWEXCL 0x00000008 #endif / __DLM_DOT_H__ */ Back

Edit File : dlm.h | Size : 2.49 KB

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/******************************************************************************
*******************************************************************************
**
**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
**  Copyright (C) 2004-2011 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 __DLM_DOT_H__
#define __DLM_DOT_H__

/*
 * Interface to Distributed Lock Manager (DLM)
 * routines and structures to use DLM lockspaces
 */

/* Lock levels and flags are here */
#include <linux/dlmconstants.h>
#include <linux/types.h>

typedef void dlm_lockspace_t;

/*
 * Lock status block
 *
 * Use this structure to specify the contents of the lock value block.  For a
 * conversion request, this structure is used to specify the lock ID of the
 * lock.  DLM writes the status of the lock request and the lock ID assigned
 * to the request in the lock status block.
 *
 * sb_lkid: the returned lock ID.  It is set on new (non-conversion) requests.
 * It is available when dlm_lock returns.
 *
 * sb_lvbptr: saves or returns the contents of the lock's LVB according to rules
 * shown for the DLM_LKF_VALBLK flag.
 *
 * sb_flags: DLM_SBF_DEMOTED is returned if in the process of promoting a lock,
 * it was first demoted to NL to avoid conversion deadlock.
 * DLM_SBF_VALNOTVALID is returned if the resource's LVB is marked invalid.
 *
 * sb_status: the returned status of the lock request set prior to AST
 * execution.  Possible return values:
 *
 * 0 if lock request was successful
 * -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE
 * -DLM_EUNLOCK if unlock request was successful
 * -DLM_ECANCEL if a cancel completed successfully
 * -EDEADLK if a deadlock was detected
 * -ETIMEDOUT if the lock request was canceled due to a timeout
 */

#define DLM_SBF_DEMOTED		0x01
#define DLM_SBF_VALNOTVALID	0x02
#define DLM_SBF_ALTMODE		0x04

struct dlm_lksb {
	int 	 sb_status;
	__u32	 sb_lkid;
	char 	 sb_flags;
	char *	 sb_lvbptr;
};

/* dlm_new_lockspace() flags */

#define DLM_LSFL_TIMEWARN	0x00000002
#define DLM_LSFL_FS     	0x00000004
#define DLM_LSFL_NEWEXCL     	0x00000008

#endif /* __DLM_DOT_H__ */

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