usr/src/sys/nfs/nfsdiskless.h

/*
 * Copyright (c) 1991 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       7.5 (Berkeley) %G%
 */

/*
 * 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 vmunix. 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.
 */
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[NFS_FHSIZE];    /* 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[NFS_FHSIZE];    /* 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 */
};