528 lines
14 KiB
C
528 lines
14 KiB
C
/*
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* Copyright (C) 1995, 1996 Gero Kuhlmann <gero@gkminix.han.de>
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*
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* Allow an NFS filesystem to be mounted as root. The way this works is:
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* (1) Use the IP autoconfig mechanism to set local IP addresses and routes.
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* (2) Handle RPC negotiation with the system which replied to RARP or
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* was reported as a boot server by BOOTP or manually.
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* (3) The actual mounting is done later, when init() is running.
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*
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*
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* Changes:
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*
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* Alan Cox : Removed get_address name clash with FPU.
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* Alan Cox : Reformatted a bit.
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* Gero Kuhlmann : Code cleanup
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* Michael Rausch : Fixed recognition of an incoming RARP answer.
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* Martin Mares : (2.0) Auto-configuration via BOOTP supported.
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* Martin Mares : Manual selection of interface & BOOTP/RARP.
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* Martin Mares : Using network routes instead of host routes,
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* allowing the default configuration to be used
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* for normal operation of the host.
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* Martin Mares : Randomized timer with exponential backoff
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* installed to minimize network congestion.
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* Martin Mares : Code cleanup.
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* Martin Mares : (2.1) BOOTP and RARP made configuration options.
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* Martin Mares : Server hostname generation fixed.
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* Gerd Knorr : Fixed wired inode handling
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* Martin Mares : (2.2) "0.0.0.0" addresses from command line ignored.
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* Martin Mares : RARP replies not tested for server address.
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* Gero Kuhlmann : (2.3) Some bug fixes and code cleanup again (please
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* send me your new patches _before_ bothering
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* Linus so that I don' always have to cleanup
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* _afterwards_ - thanks)
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* Gero Kuhlmann : Last changes of Martin Mares undone.
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* Gero Kuhlmann : RARP replies are tested for specified server
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* again. However, it's now possible to have
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* different RARP and NFS servers.
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* Gero Kuhlmann : "0.0.0.0" addresses from command line are
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* now mapped to INADDR_NONE.
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* Gero Kuhlmann : Fixed a bug which prevented BOOTP path name
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* from being used (thanks to Leo Spiekman)
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* Andy Walker : Allow to specify the NFS server in nfs_root
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* without giving a path name
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* Swen Thümmler : Allow to specify the NFS options in nfs_root
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* without giving a path name. Fix BOOTP request
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* for domainname (domainname is NIS domain, not
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* DNS domain!). Skip dummy devices for BOOTP.
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* Jacek Zapala : Fixed a bug which prevented server-ip address
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* from nfsroot parameter from being used.
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* Olaf Kirch : Adapted to new NFS code.
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* Jakub Jelinek : Free used code segment.
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* Marko Kohtala : Fixed some bugs.
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* Martin Mares : Debug message cleanup
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* Martin Mares : Changed to use the new generic IP layer autoconfig
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* code. BOOTP and RARP moved there.
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* Martin Mares : Default path now contains host name instead of
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* host IP address (but host name defaults to IP
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* address anyway).
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* Martin Mares : Use root_server_addr appropriately during setup.
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* Martin Mares : Rewrote parameter parsing, now hopefully giving
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* correct overriding.
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* Trond Myklebust : Add in preliminary support for NFSv3 and TCP.
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* Fix bug in root_nfs_addr(). nfs_data.namlen
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* is NOT for the length of the hostname.
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* Hua Qin : Support for mounting root file system via
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* NFS over TCP.
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* Fabian Frederick: Option parser rebuilt (using parser lib)
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*/
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/time.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/xprtsock.h>
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#include <linux/nfs.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_mount.h>
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#include <linux/in.h>
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#include <linux/major.h>
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#include <linux/utsname.h>
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#include <linux/inet.h>
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#include <linux/root_dev.h>
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#include <net/ipconfig.h>
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#include <linux/parser.h>
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#include "internal.h"
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/* Define this to allow debugging output */
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#undef NFSROOT_DEBUG
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#define NFSDBG_FACILITY NFSDBG_ROOT
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/* Default path we try to mount. "%s" gets replaced by our IP address */
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#define NFS_ROOT "/tftpboot/%s"
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/* Parameters passed from the kernel command line */
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static char nfs_root_name[256] __initdata = "";
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/* Address of NFS server */
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static __be32 servaddr __initdata = 0;
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/* Name of directory to mount */
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static char nfs_export_path[NFS_MAXPATHLEN] __initdata = { 0, };
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/* NFS-related data */
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static struct nfs_mount_data nfs_data __initdata = { 0, };/* NFS mount info */
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static int nfs_port __initdata = 0; /* Port to connect to for NFS */
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static int mount_port __initdata = 0; /* Mount daemon port number */
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/***************************************************************************
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Parsing of options
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***************************************************************************/
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enum {
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/* Options that take integer arguments */
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Opt_port, Opt_rsize, Opt_wsize, Opt_timeo, Opt_retrans, Opt_acregmin,
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Opt_acregmax, Opt_acdirmin, Opt_acdirmax,
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/* Options that take no arguments */
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Opt_soft, Opt_hard, Opt_intr,
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Opt_nointr, Opt_posix, Opt_noposix, Opt_cto, Opt_nocto, Opt_ac,
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Opt_noac, Opt_lock, Opt_nolock, Opt_v2, Opt_v3, Opt_udp, Opt_tcp,
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Opt_acl, Opt_noacl,
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/* Error token */
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Opt_err
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};
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static match_table_t __initconst tokens = {
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{Opt_port, "port=%u"},
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{Opt_rsize, "rsize=%u"},
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{Opt_wsize, "wsize=%u"},
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{Opt_timeo, "timeo=%u"},
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{Opt_retrans, "retrans=%u"},
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{Opt_acregmin, "acregmin=%u"},
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{Opt_acregmax, "acregmax=%u"},
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{Opt_acdirmin, "acdirmin=%u"},
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{Opt_acdirmax, "acdirmax=%u"},
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{Opt_soft, "soft"},
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{Opt_hard, "hard"},
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{Opt_intr, "intr"},
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{Opt_nointr, "nointr"},
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{Opt_posix, "posix"},
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{Opt_noposix, "noposix"},
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{Opt_cto, "cto"},
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{Opt_nocto, "nocto"},
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{Opt_ac, "ac"},
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{Opt_noac, "noac"},
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{Opt_lock, "lock"},
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{Opt_nolock, "nolock"},
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{Opt_v2, "nfsvers=2"},
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{Opt_v2, "v2"},
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{Opt_v3, "nfsvers=3"},
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{Opt_v3, "v3"},
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{Opt_udp, "proto=udp"},
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{Opt_udp, "udp"},
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{Opt_tcp, "proto=tcp"},
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{Opt_tcp, "tcp"},
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{Opt_acl, "acl"},
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{Opt_noacl, "noacl"},
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{Opt_err, NULL}
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};
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/*
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* Parse option string.
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*/
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static int __init root_nfs_parse(char *name, char *buf)
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{
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char *p;
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substring_t args[MAX_OPT_ARGS];
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int option;
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if (!name)
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return 1;
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/* Set the NFS remote path */
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p = strsep(&name, ",");
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if (p[0] != '\0' && strcmp(p, "default") != 0)
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strlcpy(buf, p, NFS_MAXPATHLEN);
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while ((p = strsep (&name, ",")) != NULL) {
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int token;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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/* %u tokens only. Beware if you add new tokens! */
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if (token < Opt_soft && match_int(&args[0], &option))
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return 0;
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switch (token) {
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case Opt_port:
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nfs_port = option;
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break;
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case Opt_rsize:
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nfs_data.rsize = option;
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break;
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case Opt_wsize:
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nfs_data.wsize = option;
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break;
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case Opt_timeo:
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nfs_data.timeo = option;
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break;
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case Opt_retrans:
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nfs_data.retrans = option;
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break;
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case Opt_acregmin:
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nfs_data.acregmin = option;
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break;
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case Opt_acregmax:
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nfs_data.acregmax = option;
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break;
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case Opt_acdirmin:
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nfs_data.acdirmin = option;
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break;
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case Opt_acdirmax:
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nfs_data.acdirmax = option;
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break;
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case Opt_soft:
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nfs_data.flags |= NFS_MOUNT_SOFT;
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break;
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case Opt_hard:
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nfs_data.flags &= ~NFS_MOUNT_SOFT;
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break;
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case Opt_intr:
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case Opt_nointr:
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break;
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case Opt_posix:
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nfs_data.flags |= NFS_MOUNT_POSIX;
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break;
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case Opt_noposix:
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nfs_data.flags &= ~NFS_MOUNT_POSIX;
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break;
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case Opt_cto:
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nfs_data.flags &= ~NFS_MOUNT_NOCTO;
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break;
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case Opt_nocto:
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nfs_data.flags |= NFS_MOUNT_NOCTO;
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break;
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case Opt_ac:
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nfs_data.flags &= ~NFS_MOUNT_NOAC;
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break;
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case Opt_noac:
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nfs_data.flags |= NFS_MOUNT_NOAC;
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break;
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case Opt_lock:
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nfs_data.flags &= ~NFS_MOUNT_NONLM;
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break;
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case Opt_nolock:
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nfs_data.flags |= NFS_MOUNT_NONLM;
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break;
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case Opt_v2:
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nfs_data.flags &= ~NFS_MOUNT_VER3;
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break;
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case Opt_v3:
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nfs_data.flags |= NFS_MOUNT_VER3;
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break;
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case Opt_udp:
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nfs_data.flags &= ~NFS_MOUNT_TCP;
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break;
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case Opt_tcp:
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nfs_data.flags |= NFS_MOUNT_TCP;
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break;
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case Opt_acl:
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nfs_data.flags &= ~NFS_MOUNT_NOACL;
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break;
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case Opt_noacl:
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nfs_data.flags |= NFS_MOUNT_NOACL;
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break;
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default:
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printk(KERN_WARNING "Root-NFS: unknown "
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"option: %s\n", p);
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return 0;
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}
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}
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return 1;
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}
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/*
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* Prepare the NFS data structure and parse all options.
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*/
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static int __init root_nfs_name(char *name)
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{
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static char buf[NFS_MAXPATHLEN] __initdata;
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char *cp;
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/* Set some default values */
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memset(&nfs_data, 0, sizeof(nfs_data));
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nfs_port = -1;
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nfs_data.version = NFS_MOUNT_VERSION;
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nfs_data.flags = NFS_MOUNT_NONLM; /* No lockd in nfs root yet */
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nfs_data.rsize = NFS_DEF_FILE_IO_SIZE;
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nfs_data.wsize = NFS_DEF_FILE_IO_SIZE;
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nfs_data.acregmin = NFS_DEF_ACREGMIN;
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nfs_data.acregmax = NFS_DEF_ACREGMAX;
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nfs_data.acdirmin = NFS_DEF_ACDIRMIN;
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nfs_data.acdirmax = NFS_DEF_ACDIRMAX;
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strcpy(buf, NFS_ROOT);
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/* Process options received from the remote server */
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root_nfs_parse(root_server_path, buf);
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/* Override them by options set on kernel command-line */
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root_nfs_parse(name, buf);
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cp = utsname()->nodename;
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if (strlen(buf) + strlen(cp) > NFS_MAXPATHLEN) {
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printk(KERN_ERR "Root-NFS: Pathname for remote directory too long.\n");
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return -1;
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}
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sprintf(nfs_export_path, buf, cp);
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return 1;
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}
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/*
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* Get NFS server address.
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*/
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static int __init root_nfs_addr(void)
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{
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if ((servaddr = root_server_addr) == htonl(INADDR_NONE)) {
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printk(KERN_ERR "Root-NFS: No NFS server available, giving up.\n");
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return -1;
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}
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snprintf(nfs_data.hostname, sizeof(nfs_data.hostname),
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"%pI4", &servaddr);
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return 0;
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}
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/*
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* Tell the user what's going on.
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*/
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#ifdef NFSROOT_DEBUG
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static void __init root_nfs_print(void)
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{
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printk(KERN_NOTICE "Root-NFS: Mounting %s on server %s as root\n",
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nfs_export_path, nfs_data.hostname);
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printk(KERN_NOTICE "Root-NFS: rsize = %d, wsize = %d, timeo = %d, retrans = %d\n",
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nfs_data.rsize, nfs_data.wsize, nfs_data.timeo, nfs_data.retrans);
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printk(KERN_NOTICE "Root-NFS: acreg (min,max) = (%d,%d), acdir (min,max) = (%d,%d)\n",
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nfs_data.acregmin, nfs_data.acregmax,
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nfs_data.acdirmin, nfs_data.acdirmax);
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printk(KERN_NOTICE "Root-NFS: nfsd port = %d, mountd port = %d, flags = %08x\n",
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nfs_port, mount_port, nfs_data.flags);
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}
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#endif
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static int __init root_nfs_init(void)
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{
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#ifdef NFSROOT_DEBUG
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nfs_debug |= NFSDBG_ROOT;
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#endif
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/*
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* Decode the root directory path name and NFS options from
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* the kernel command line. This has to go here in order to
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* be able to use the client IP address for the remote root
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* directory (necessary for pure RARP booting).
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*/
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if (root_nfs_name(nfs_root_name) < 0 ||
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root_nfs_addr() < 0)
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return -1;
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#ifdef NFSROOT_DEBUG
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root_nfs_print();
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#endif
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return 0;
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}
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/*
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* Parse NFS server and directory information passed on the kernel
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* command line.
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*/
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static int __init nfs_root_setup(char *line)
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{
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ROOT_DEV = Root_NFS;
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if (line[0] == '/' || line[0] == ',' || (line[0] >= '0' && line[0] <= '9')) {
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strlcpy(nfs_root_name, line, sizeof(nfs_root_name));
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} else {
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int n = strlen(line) + sizeof(NFS_ROOT) - 1;
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if (n >= sizeof(nfs_root_name))
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line[sizeof(nfs_root_name) - sizeof(NFS_ROOT) - 2] = '\0';
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sprintf(nfs_root_name, NFS_ROOT, line);
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}
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root_server_addr = root_nfs_parse_addr(nfs_root_name);
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return 1;
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}
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__setup("nfsroot=", nfs_root_setup);
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/***************************************************************************
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Routines to actually mount the root directory
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***************************************************************************/
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/*
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* Construct sockaddr_in from address and port number.
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*/
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static inline void
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set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
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{
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = addr;
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sin->sin_port = port;
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}
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/*
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* Query server portmapper for the port of a daemon program.
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*/
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static int __init root_nfs_getport(int program, int version, int proto)
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{
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struct sockaddr_in sin;
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printk(KERN_NOTICE "Looking up port of RPC %d/%d on %pI4\n",
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program, version, &servaddr);
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set_sockaddr(&sin, servaddr, 0);
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return rpcb_getport_sync(&sin, program, version, proto);
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}
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/*
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* Use portmapper to find mountd and nfsd port numbers if not overriden
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* by the user. Use defaults if portmapper is not available.
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* XXX: Is there any nfs server with no portmapper?
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*/
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static int __init root_nfs_ports(void)
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{
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int port;
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int nfsd_ver, mountd_ver;
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int nfsd_port, mountd_port;
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int proto;
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if (nfs_data.flags & NFS_MOUNT_VER3) {
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nfsd_ver = NFS3_VERSION;
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mountd_ver = NFS_MNT3_VERSION;
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nfsd_port = NFS_PORT;
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mountd_port = NFS_MNT_PORT;
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} else {
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nfsd_ver = NFS2_VERSION;
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mountd_ver = NFS_MNT_VERSION;
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nfsd_port = NFS_PORT;
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mountd_port = NFS_MNT_PORT;
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}
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proto = (nfs_data.flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
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if (nfs_port < 0) {
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if ((port = root_nfs_getport(NFS_PROGRAM, nfsd_ver, proto)) < 0) {
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printk(KERN_ERR "Root-NFS: Unable to get nfsd port "
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"number from server, using default\n");
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port = nfsd_port;
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}
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nfs_port = port;
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dprintk("Root-NFS: Portmapper on server returned %d "
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"as nfsd port\n", port);
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}
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if ((port = root_nfs_getport(NFS_MNT_PROGRAM, mountd_ver, proto)) < 0) {
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printk(KERN_ERR "Root-NFS: Unable to get mountd port "
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"number from server, using default\n");
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port = mountd_port;
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}
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mount_port = port;
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dprintk("Root-NFS: mountd port is %d\n", port);
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return 0;
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}
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/*
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* Get a file handle from the server for the directory which is to be
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* mounted.
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*/
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static int __init root_nfs_get_handle(void)
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{
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struct nfs_fh fh;
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struct sockaddr_in sin;
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struct nfs_mount_request request = {
|
|
.sap = (struct sockaddr *)&sin,
|
|
.salen = sizeof(sin),
|
|
.dirpath = nfs_export_path,
|
|
.version = (nfs_data.flags & NFS_MOUNT_VER3) ?
|
|
NFS_MNT3_VERSION : NFS_MNT_VERSION,
|
|
.protocol = (nfs_data.flags & NFS_MOUNT_TCP) ?
|
|
XPRT_TRANSPORT_TCP : XPRT_TRANSPORT_UDP,
|
|
.fh = &fh,
|
|
};
|
|
int status;
|
|
|
|
set_sockaddr(&sin, servaddr, htons(mount_port));
|
|
status = nfs_mount(&request);
|
|
if (status < 0)
|
|
printk(KERN_ERR "Root-NFS: Server returned error %d "
|
|
"while mounting %s\n", status, nfs_export_path);
|
|
else {
|
|
nfs_data.root.size = fh.size;
|
|
memcpy(nfs_data.root.data, fh.data, fh.size);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Get the NFS port numbers and file handle, and return the prepared 'data'
|
|
* argument for mount() if everything went OK. Return NULL otherwise.
|
|
*/
|
|
void * __init nfs_root_data(void)
|
|
{
|
|
if (root_nfs_init() < 0
|
|
|| root_nfs_ports() < 0
|
|
|| root_nfs_get_handle() < 0)
|
|
return NULL;
|
|
set_sockaddr((struct sockaddr_in *) &nfs_data.addr, servaddr, htons(nfs_port));
|
|
return (void*)&nfs_data;
|
|
}
|