nfs_clnt.h

<B>Digital的Unix操作系统VAX 4.2源码</B>

/*	@(#)nfs_clnt.h	4.4	(ULTRIX)	2/28/91	*/


/************************************************************************
 *									*
 *			Copyright (c) 1986, 1987 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.
 */

/*
 * vfs pointer to mount info
 */
#define	vftomi(vfsp)	((struct mntinfo *)((vfsp)->vfs_data))

/*
 * vnode pointer to mount info
 */
#define	vtomi(vp)	((struct mntinfo *)(((vp)->v_vfsp)->vfs_data))

/*
 * NFS vnode to server's block size
 */
#define	vtoblksz(vp)	(vtomi(vp)->mi_bsize)

#define		HOSTNAMESZ      32
#define		MNTMAXSTR	128

/*
 * NFS private data per mounted file system
 */
struct mntinfo {
	struct sockaddr_in mi_addr;	/* server's address */
	struct vnode	*mi_rootvp;	/* root vnode */
        u_int            mi_hard : 1;   /* hard or soft mount */
        u_int            mi_printed : 1;/* not responding message printed */
	u_int		 mi_int : 1;	/* interrupts allowed on hard mount */
	u_int		 mi_down : 1;	/* server is down */
	u_int		 mi_noac: 1;	/* no attributes caching */
	int		 mi_refct;	/* active vnodes for this vfs */
	long		 mi_tsize;	/* transfer size (bytes) */
	long		 mi_stsize;	/* server's max transfer size (bytes) */
	long		 mi_bsize;	/* server's disk block size */
	int		 mi_mntno;	/* kludge to set client rdev for stat*/
        int              mi_timeo;      /* inital timeout in 10th sec */
        int              mi_retrans;    /* times to retry request */
        int              mi_acregmin;   /* min seconds for file attr cache */
        int              mi_acregmax;   /* max seconds for file attr cache */
        int              mi_acdirmin;   /* min seconds for dir caching */
        int              mi_acdirmax;   /* max seconds for dir caching */
        char             mi_hostname[HOSTNAMESZ + 1];	/* server name */
	char		 mi_optstr[MNTMAXSTR + 1];	/* mount options */
};

/*
 * enum to specifiy cache flushing action when file data is stale
 */
enum staleflush	{NOFLUSH, SFLUSH};

/*
 * NFS client side booleans
 */

/* used for argument to nfsread() and nfswrite() */
#define NFS_BLOCKIO	1	/* read/write on behalf of buffer cache */
#define NFS_NOT_BLOCKIO	0	/*     "     not on   "   */