The C and C++ Include Header Files

/usr/include/linux/dlm.h


$ cat -n /usr/include/linux/dlm.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	/******************************************************************************
     3	*******************************************************************************
     4	**
     5	**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
     6	**  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
     7	**
     8	**  This copyrighted material is made available to anyone wishing to use,
     9	**  modify, copy, or redistribute it subject to the terms and conditions
    10	**  of the GNU General Public License v.2.
    11	**
    12	*******************************************************************************
    13	******************************************************************************/
    14	
    15	#ifndef __DLM_DOT_H__
    16	#define __DLM_DOT_H__
    17	
    18	/*
    19	 * Interface to Distributed Lock Manager (DLM)
    20	 * routines and structures to use DLM lockspaces
    21	 */
    22	
    23	/* Lock levels and flags are here */
    24	#include <linux/dlmconstants.h>
    25	#include <linux/types.h>
    26	
    27	typedef void dlm_lockspace_t;
    28	
    29	/*
    30	 * Lock status block
    31	 *
    32	 * Use this structure to specify the contents of the lock value block.  For a
    33	 * conversion request, this structure is used to specify the lock ID of the
    34	 * lock.  DLM writes the status of the lock request and the lock ID assigned
    35	 * to the request in the lock status block.
    36	 *
    37	 * sb_lkid: the returned lock ID.  It is set on new (non-conversion) requests.
    38	 * It is available when dlm_lock returns.
    39	 *
    40	 * sb_lvbptr: saves or returns the contents of the lock's LVB according to rules
    41	 * shown for the DLM_LKF_VALBLK flag.
    42	 *
    43	 * sb_flags: DLM_SBF_DEMOTED is returned if in the process of promoting a lock,
    44	 * it was first demoted to NL to avoid conversion deadlock.
    45	 * DLM_SBF_VALNOTVALID is returned if the resource's LVB is marked invalid.
    46	 *
    47	 * sb_status: the returned status of the lock request set prior to AST
    48	 * execution.  Possible return values:
    49	 *
    50	 * 0 if lock request was successful
    51	 * -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE
    52	 * -DLM_EUNLOCK if unlock request was successful
    53	 * -DLM_ECANCEL if a cancel completed successfully
    54	 * -EDEADLK if a deadlock was detected
    55	 * -ETIMEDOUT if the lock request was canceled due to a timeout
    56	 */
    57	
    58	#define DLM_SBF_DEMOTED		0x01
    59	#define DLM_SBF_VALNOTVALID	0x02
    60	#define DLM_SBF_ALTMODE		0x04
    61	
    62	struct dlm_lksb {
    63		int 	 sb_status;
    64		__u32	 sb_lkid;
    65		char 	 sb_flags;
    66		char *	 sb_lvbptr;
    67	};
    68	
    69	/* dlm_new_lockspace() flags */
    70	
    71	/* DLM_LSFL_TIMEWARN is deprecated and reserved. DO NOT USE! */
    72	#define DLM_LSFL_TIMEWARN	0x00000002
    73	#define DLM_LSFL_NEWEXCL     	0x00000008
    74	
    75	
    76	#endif /* __DLM_DOT_H__ */