lockmgr.h

<B>Digital的Unix操作系统VAX 4.2源码</B>

/* static	char	*sccsid = "@(#)lockmgr.h	4.1	7/2/90"; */

/************************************************************************
 *									*
 *			Copyright (c) 1986 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/*
 *	Portions of this software have been licensed to 
 *	Digital Equipment Company, Maynard, MA.
 *	Copyright (c) 1986 Sun Microsystems, Inc.  ALL RIGHTS RESERVED.
 */

/*
 * Header file for Kernel<->Network Lock-Manager implementation
 */

/*
 * File identifier. Should be unique per filesystem on a single machine.
 */
#define	MAXFIDSZ	16
#define	freefid(fidp) \
    kmem_free((caddr_t)(fidp), sizeof (struct fid) - MAXFIDSZ + (fidp)->fid_len)

struct fid {
	u_short		fid_len;		/* length of data in bytes */
	char		fid_data[MAXFIDSZ];	/* data (variable length) */
};

/*
 * This overlays the fid sturcture 
 */
struct ufid {
	u_short	ufid_len;
	gno_t	ufid_gno;
	long	ufid_gen;
};

/* NOTE: size of a lockhandle-id should track the size of an fhandle */
#define KLM_LHSIZE	32

/* the lockhandle uniquely describes any file in a domain */
typedef struct {
	struct gnode *lh_gp;			/* vnode of file */
	char *lh_servername;			/* file server machine name */
	fhandle_t lh_id;                        /* jaa */
} lockhandle_t;
#define lh_fsid	lh_id.fh_fsid


/* define 'well-known' information */
#define KLM_PROTO	IPPROTO_UDP

/* define public routines */
int  klm_lockctl();