nfsdiskless.h

Go to the documentation of this file.

/*
 * 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.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)nfsdiskless.h       8.1 (Berkeley) 6/10/93
 */

#ifndef _NFS_NFSDISKLESS_H_
#define _NFS_NFSDISKLESS_H_

#include <netinet/in.h> /* struct sockaddr_in */
#include <net/if.h>
#include <nfs/nfsproto.h> /* NFSX_V3FHMAX */
#include <nfsclient/nfsargs.h> /* struct nfs_args */

/*
 * 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