8eb928cd77
This code dates back to the very first diskless support on FreeBSD,
back when swapon(8) couldn't simply be run on a NFS backed file.
Suggested replacement command sequence on the client:
dd if=/dev/zero of=/swapfile bs=1k count=1 oseek=100000
swapon /swapfile
rm -f /swapfile
For whatever value of 100000 you want.
118 lines
4.9 KiB
C
118 lines
4.9 KiB
C
/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)nfsdiskless.h 8.2 (Berkeley) 3/30/95
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* $FreeBSD$
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*/
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#ifndef _NFSCLIENT_NFSDISKLESS_H_
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#define _NFSCLIENT_NFSDISKLESS_H_
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/*
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* Structure that must be initialized for a diskless nfs client.
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* This structure is used by nfs_mountroot() to set up the root vnode,
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* and to do a partial ifconfig(8) and route(8) so that the critical net
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* interface can communicate with the server.
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* The primary bootstrap is expected to fill in the appropriate fields before
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* starting the kernel.
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* Currently only works for AF_INET protocols.
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* NB: All fields are stored in net byte order to avoid hassles with
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* client/server byte ordering differences.
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*/
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/*
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* I have defined a new structure that can handle an NFS Version 3 file handle
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* but the kernel still expects the old Version 2 one to be provided. The
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* changes required in nfs_vfsops.c for using the new are documented there in
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* comments. (I felt that breaking network booting code by changing this
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* structure would not be prudent at this time, since almost all servers are
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* still Version 2 anyhow.)
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*/
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struct nfsv3_diskless {
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struct ifaliasreq myif; /* Default interface */
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struct sockaddr_in mygateway; /* Default gateway */
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struct nfs_args root_args; /* Mount args for root fs */
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int root_fhsize; /* Size of root file handle */
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u_char root_fh[NFSX_V3FHMAX]; /* File handle of root dir */
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struct sockaddr_in root_saddr; /* Address of root server */
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char root_hostnam[MNAMELEN]; /* Host name for mount pt */
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long root_time; /* Timestamp of root fs */
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char my_hostnam[MAXHOSTNAMELEN]; /* Client host name */
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};
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/*
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* Old arguments to mount NFS
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*/
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struct onfs_args {
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struct sockaddr *addr; /* file server address */
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int addrlen; /* length of address */
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int sotype; /* Socket type */
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int proto; /* and Protocol */
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u_char *fh; /* File handle to be mounted */
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int fhsize; /* Size, in bytes, of fh */
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int flags; /* flags */
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int wsize; /* write size in bytes */
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int rsize; /* read size in bytes */
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int readdirsize; /* readdir size in bytes */
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int timeo; /* initial timeout in .1 secs */
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int retrans; /* times to retry send */
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int maxgrouplist; /* Max. size of group list */
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int readahead; /* # of blocks to readahead */
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int leaseterm; /* Term (sec) of lease */
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int deadthresh; /* Retrans threshold */
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char *hostname; /* server's name */
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};
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struct nfs_diskless {
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struct ifaliasreq myif; /* Default interface */
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struct sockaddr_in mygateway; /* Default gateway */
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struct onfs_args root_args; /* Mount args for root fs */
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u_char root_fh[NFSX_V2FH]; /* File handle of root dir */
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struct sockaddr_in root_saddr; /* Address of root server */
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char root_hostnam[MNAMELEN]; /* Host name for mount pt */
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long root_time; /* Timestamp of root fs */
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char my_hostnam[MAXHOSTNAMELEN]; /* Client host name */
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};
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#ifdef _KERNEL
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extern struct nfsv3_diskless nfsv3_diskless;
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extern struct nfs_diskless nfs_diskless;
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extern int nfs_diskless_valid;
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void bootpc_init(void);
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void nfs_setup_diskless(void);
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#endif
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#endif
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