FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsclient/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.
      *
      * 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.
     *
     * $FreeBSD: releng/8.2/sys/fs/nfsclient/nfsdiskless.h 191783 2009-05-04 15:23:58Z rmacklem $
     */
    
    #ifndef _NFSCLIENT_NFSDISKLESS_H_
    #define _NFSCLIENT_NFSDISKLESS_H_
    
    /*
     * Structure that must be initialized for a diskless nfs client.
     * This structure is used by nfs_mountroot() to set up the root vnode,
     * and to 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.
     * 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 root_args;              /* Mount args for root fs */
            int             root_fhsize;            /* Size of root file handle */
            u_char          root_fh[NFSX_FHMAX];    /* 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 */
    };
    
    /*
     * Old arguments to mount NFS
     */
    struct onfs_args {
            struct sockaddr *addr;          /* file server address */
            int             addrlen;        /* length of address */
            int             sotype;         /* Socket type */
            int             proto;          /* and Protocol */
            u_char          *fh;            /* File handle to be mounted */
            int             fhsize;         /* Size, in bytes, of fh */
            int             flags;          /* flags */
            int             wsize;          /* write size in bytes */
            int             rsize;          /* read size in bytes */
            int             readdirsize;    /* readdir size in bytes */
            int             timeo;          /* initial timeout in .1 secs */
            int             retrans;        /* times to retry send */
            int             readahead;      /* # of blocks to readahead */
            int             leaseterm;      /* Term (sec) of lease */
            char            *hostname;      /* server's name */
    };
    
    struct nfs_diskless {
            struct ifaliasreq myif;                 /* Default interface */
            struct sockaddr_in mygateway;           /* Default gateway */
            struct onfs_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 */
   };
   
   #ifdef _KERNEL
   void bootpc_init(void);
   void nfs_setup_diskless(void);
   void nfs_parse_options(const char *, struct nfs_args *);
   #endif
   
   #endif  /* _NFSCLIENT_NFSDISKLESS_H_ */

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