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include/uapi/linux/dlm.h
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/******************************************************************************
*******************************************************************************
**
** 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 _UAPI__DLM_DOT_H__
#define _UAPI__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 /* _UAPI__DLM_DOT_H__ */
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