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[unix-history] / usr / src / sys / nfs / nfsdiskless.h

/*
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)nfsdiskless.h	8.2 (Berkeley) %G%
 */


#ifndef _NFS_NFSDISKLESS_H_
#define _NFS_NFSDISKLESS_H_

/*
 * Structure that must be initialized for a diskless nfs client.
 * This structure is used by nfs_mountroot() to set up the root and swap
 * vnodes plus do a partial ifconfig(8) and route(8) so that the critical net
 * interface can communicate with the server.
 * The primary bootstrap is expected to fill in the appropriate fields before
 * starting the kernel. Whether or not the swap area is nfs mounted is
 * determined by the value in swdevt[0]. (equal to NODEV --> swap over nfs)
 * Currently only works for AF_INET protocols.
 * NB: All fields are stored in net byte order to avoid hassles with
 * client/server byte ordering differences.
 */

/*
 * I have defined a new structure that can handle an NFS Version 3 file handle
 * but the kernel still expects the old Version 2 one to be provided. The
 * changes required in nfs_vfsops.c for using the new are documented there in
 * comments. (I felt that breaking network booting code by changing this
 * structure would not be prudent at this time, since almost all servers are
 * still Version 2 anyhow.)
 */
struct nfsv3_diskless {
	struct ifaliasreq myif;			/* Default interface */
	struct sockaddr_in mygateway;		/* Default gateway */
	struct nfs_args	swap_args;		/* Mount args for swap file */
	int		swap_fhsize;		/* Size of file handle */
	u_char		swap_fh[NFSX_V3FHMAX];	/* Swap file's file handle */
	struct sockaddr_in swap_saddr;		/* Address of swap server */
	char		swap_hostnam[MNAMELEN];	/* Host name for mount pt */
	int		swap_nblks;		/* Size of server swap file */
	struct ucred	swap_ucred;		/* Swap credentials */
	struct nfs_args	root_args;		/* Mount args for root fs */
	int		root_fhsize;		/* Size of root file handle */
	u_char		root_fh[NFSX_V3FHMAX];	/* File handle of root dir */
	struct sockaddr_in root_saddr;		/* Address of root server */
	char		root_hostnam[MNAMELEN];	/* Host name for mount pt */
	long		root_time;		/* Timestamp of root fs */
	char		my_hostnam[MAXHOSTNAMELEN]; /* Client host name */
};

struct nfs_diskless {
	struct ifaliasreq myif;			/* Default interface */
	struct sockaddr_in mygateway;		/* Default gateway */
	struct nfs_args	swap_args;		/* Mount args for swap file */
	u_char		swap_fh[NFSX_V2FH];	/* Swap file's file handle */
	struct sockaddr_in swap_saddr;		/* Address of swap server */
	char		swap_hostnam[MNAMELEN];	/* Host name for mount pt */
	int		swap_nblks;		/* Size of server swap file */
	struct ucred	swap_ucred;		/* Swap credentials */
	struct nfs_args	root_args;		/* Mount args for root fs */
	u_char		root_fh[NFSX_V2FH];	/* File handle of root dir */
	struct sockaddr_in root_saddr;		/* Address of root server */
	char		root_hostnam[MNAMELEN];	/* Host name for mount pt */
	long		root_time;		/* Timestamp of root fs */
	char		my_hostnam[MAXHOSTNAMELEN]; /* Client host name */
};

#endif