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linux/fs/nfs/nfsroot.c
Jorn Dreyer 21b6bf143d [PATCH] nfsroot: do not silently stop parsing on an unknown option 
It would be helpful if the kernel did not silently stop parsing
nfs options, but instead warned about any he does not recognize. The
attached patch adds one printk to do just that.

It took me a couple of hours to find my configuration mistake.

Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-08 20:13:57 -08:00

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/*
* $Id: nfsroot.c,v 1.45 1998/03/07 10:44:46 mj Exp $
*
* Copyright (C) 1995, 1996 Gero Kuhlmann <gero@gkminix.han.de>
*
* Allow an NFS filesystem to be mounted as root. The way this works is:
* (1) Use the IP autoconfig mechanism to set local IP addresses and routes.
* (2) Handle RPC negotiation with the system which replied to RARP or
* was reported as a boot server by BOOTP or manually.
* (3) The actual mounting is done later, when init() is running.
*
*
* Changes:
*
* Alan Cox : Removed get_address name clash with FPU.
* Alan Cox : Reformatted a bit.
* Gero Kuhlmann : Code cleanup
* Michael Rausch : Fixed recognition of an incoming RARP answer.
* Martin Mares : (2.0) Auto-configuration via BOOTP supported.
* Martin Mares : Manual selection of interface & BOOTP/RARP.
* Martin Mares : Using network routes instead of host routes,
* allowing the default configuration to be used
* for normal operation of the host.
* Martin Mares : Randomized timer with exponential backoff
* installed to minimize network congestion.
* Martin Mares : Code cleanup.
* Martin Mares : (2.1) BOOTP and RARP made configuration options.
* Martin Mares : Server hostname generation fixed.
* Gerd Knorr : Fixed wired inode handling
* Martin Mares : (2.2) "0.0.0.0" addresses from command line ignored.
* Martin Mares : RARP replies not tested for server address.
* Gero Kuhlmann : (2.3) Some bug fixes and code cleanup again (please
* send me your new patches _before_ bothering
* Linus so that I don' always have to cleanup
* _afterwards_ - thanks)
* Gero Kuhlmann : Last changes of Martin Mares undone.
* Gero Kuhlmann : RARP replies are tested for specified server
* again. However, it's now possible to have
* different RARP and NFS servers.
* Gero Kuhlmann : "0.0.0.0" addresses from command line are
* now mapped to INADDR_NONE.
* Gero Kuhlmann : Fixed a bug which prevented BOOTP path name
* from being used (thanks to Leo Spiekman)
* Andy Walker : Allow to specify the NFS server in nfs_root
* without giving a path name
* Swen Th<54>mmler : Allow to specify the NFS options in nfs_root
* without giving a path name. Fix BOOTP request
* for domainname (domainname is NIS domain, not
* DNS domain!). Skip dummy devices for BOOTP.
* Jacek Zapala : Fixed a bug which prevented server-ip address
* from nfsroot parameter from being used.
* Olaf Kirch : Adapted to new NFS code.
* Jakub Jelinek : Free used code segment.
* Marko Kohtala : Fixed some bugs.
* Martin Mares : Debug message cleanup
* Martin Mares : Changed to use the new generic IP layer autoconfig
* code. BOOTP and RARP moved there.
* Martin Mares : Default path now contains host name instead of
* host IP address (but host name defaults to IP
* address anyway).
* Martin Mares : Use root_server_addr appropriately during setup.
* Martin Mares : Rewrote parameter parsing, now hopefully giving
* correct overriding.
* Trond Myklebust : Add in preliminary support for NFSv3 and TCP.
* Fix bug in root_nfs_addr(). nfs_data.namlen
* is NOT for the length of the hostname.
* Hua Qin : Support for mounting root file system via
* NFS over TCP.
* Fabian Frederick: Option parser rebuilt (using parser lib)
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/in.h>
#include <linux/major.h>
#include <linux/utsname.h>
#include <linux/inet.h>
#include <linux/root_dev.h>
#include <net/ipconfig.h>
#include <linux/parser.h>
/* Define this to allow debugging output */
#undef NFSROOT_DEBUG
#define NFSDBG_FACILITY NFSDBG_ROOT
/* Default path we try to mount. "%s" gets replaced by our IP address */
#define NFS_ROOT "/tftpboot/%s"
/* Parameters passed from the kernel command line */
static char nfs_root_name[256] __initdata = "";
/* Address of NFS server */
static __u32 servaddr __initdata = 0;
/* Name of directory to mount */
static char nfs_path[NFS_MAXPATHLEN] __initdata = { 0, };
/* NFS-related data */
static struct nfs_mount_data nfs_data __initdata = { 0, };/* NFS mount info */
static int nfs_port __initdata = 0; /* Port to connect to for NFS */
static int mount_port __initdata = 0; /* Mount daemon port number */
/***************************************************************************
Parsing of options
***************************************************************************/
enum {
/* Options that take integer arguments */
Opt_port, Opt_rsize, Opt_wsize, Opt_timeo, Opt_retrans, Opt_acregmin,
Opt_acregmax, Opt_acdirmin, Opt_acdirmax,
/* Options that take no arguments */
Opt_soft, Opt_hard, Opt_intr,
Opt_nointr, Opt_posix, Opt_noposix, Opt_cto, Opt_nocto, Opt_ac,
Opt_noac, Opt_lock, Opt_nolock, Opt_v2, Opt_v3, Opt_udp, Opt_tcp,
Opt_acl, Opt_noacl,
/* Error token */
Opt_err
};
static match_table_t __initdata tokens = {
{Opt_port, "port=%u"},
{Opt_rsize, "rsize=%u"},
{Opt_wsize, "wsize=%u"},
{Opt_timeo, "timeo=%u"},
{Opt_retrans, "retrans=%u"},
{Opt_acregmin, "acregmin=%u"},
{Opt_acregmax, "acregmax=%u"},
{Opt_acdirmin, "acdirmin=%u"},
{Opt_acdirmax, "acdirmax=%u"},
{Opt_soft, "soft"},
{Opt_hard, "hard"},
{Opt_intr, "intr"},
{Opt_nointr, "nointr"},
{Opt_posix, "posix"},
{Opt_noposix, "noposix"},
{Opt_cto, "cto"},
{Opt_nocto, "nocto"},
{Opt_ac, "ac"},
{Opt_noac, "noac"},
{Opt_lock, "lock"},
{Opt_nolock, "nolock"},
{Opt_v2, "nfsvers=2"},
{Opt_v2, "v2"},
{Opt_v3, "nfsvers=3"},
{Opt_v3, "v3"},
{Opt_udp, "proto=udp"},
{Opt_udp, "udp"},
{Opt_tcp, "proto=tcp"},
{Opt_tcp, "tcp"},
{Opt_acl, "acl"},
{Opt_noacl, "noacl"},
{Opt_err, NULL}
};
/*
* Parse option string.
*/
static int __init root_nfs_parse(char *name, char *buf)
{
char *p;
substring_t args[MAX_OPT_ARGS];
int option;
if (!name)
return 1;
/* Set the NFS remote path */
p = strsep(&name, ",");
if (p[0] != '\0' && strcmp(p, "default") != 0)
strlcpy(buf, p, NFS_MAXPATHLEN);
while ((p = strsep (&name, ",")) != NULL) {
int token;
if (!*p)
continue;
token = match_token(p, tokens, args);
/* %u tokens only. Beware if you add new tokens! */
if (token < Opt_soft && match_int(&args[0], &option))
return 0;
switch (token) {
case Opt_port:
nfs_port = option;
break;
case Opt_rsize:
nfs_data.rsize = option;
break;
case Opt_wsize:
nfs_data.wsize = option;
break;
case Opt_timeo:
nfs_data.timeo = option;
break;
case Opt_retrans:
nfs_data.retrans = option;
break;
case Opt_acregmin:
nfs_data.acregmin = option;
break;
case Opt_acregmax:
nfs_data.acregmax = option;
break;
case Opt_acdirmin:
nfs_data.acdirmin = option;
break;
case Opt_acdirmax:
nfs_data.acdirmax = option;
break;
case Opt_soft:
nfs_data.flags |= NFS_MOUNT_SOFT;
break;
case Opt_hard:
nfs_data.flags &= ~NFS_MOUNT_SOFT;
break;
case Opt_intr:
nfs_data.flags |= NFS_MOUNT_INTR;
break;
case Opt_nointr:
nfs_data.flags &= ~NFS_MOUNT_INTR;
break;
case Opt_posix:
nfs_data.flags |= NFS_MOUNT_POSIX;
break;
case Opt_noposix:
nfs_data.flags &= ~NFS_MOUNT_POSIX;
break;
case Opt_cto:
nfs_data.flags &= ~NFS_MOUNT_NOCTO;
break;
case Opt_nocto:
nfs_data.flags |= NFS_MOUNT_NOCTO;
break;
case Opt_ac:
nfs_data.flags &= ~NFS_MOUNT_NOAC;
break;
case Opt_noac:
nfs_data.flags |= NFS_MOUNT_NOAC;
break;
case Opt_lock:
nfs_data.flags &= ~NFS_MOUNT_NONLM;
break;
case Opt_nolock:
nfs_data.flags |= NFS_MOUNT_NONLM;
break;
case Opt_v2:
nfs_data.flags &= ~NFS_MOUNT_VER3;
break;
case Opt_v3:
nfs_data.flags |= NFS_MOUNT_VER3;
break;
case Opt_udp:
nfs_data.flags &= ~NFS_MOUNT_TCP;
break;
case Opt_tcp:
nfs_data.flags |= NFS_MOUNT_TCP;
break;
case Opt_acl:
nfs_data.flags &= ~NFS_MOUNT_NOACL;
break;
case Opt_noacl:
nfs_data.flags |= NFS_MOUNT_NOACL;
break;
default:
printk(KERN_WARNING "Root-NFS: unknown "
"option: %s\n", p);
return 0;
}
}
return 1;
}
/*
* Prepare the NFS data structure and parse all options.
*/
static int __init root_nfs_name(char *name)
{
static char buf[NFS_MAXPATHLEN] __initdata;
char *cp;
/* Set some default values */
memset(&nfs_data, 0, sizeof(nfs_data));
nfs_port = -1;
nfs_data.version = NFS_MOUNT_VERSION;
nfs_data.flags = NFS_MOUNT_NONLM; /* No lockd in nfs root yet */
nfs_data.rsize = NFS_DEF_FILE_IO_SIZE;
nfs_data.wsize = NFS_DEF_FILE_IO_SIZE;
nfs_data.acregmin = 3;
nfs_data.acregmax = 60;
nfs_data.acdirmin = 30;
nfs_data.acdirmax = 60;
strcpy(buf, NFS_ROOT);
/* Process options received from the remote server */
root_nfs_parse(root_server_path, buf);
/* Override them by options set on kernel command-line */
root_nfs_parse(name, buf);
cp = system_utsname.nodename;
if (strlen(buf) + strlen(cp) > NFS_MAXPATHLEN) {
printk(KERN_ERR "Root-NFS: Pathname for remote directory too long.\n");
return -1;
}
sprintf(nfs_path, buf, cp);
return 1;
}
/*
* Get NFS server address.
*/
static int __init root_nfs_addr(void)
{
if ((servaddr = root_server_addr) == INADDR_NONE) {
printk(KERN_ERR "Root-NFS: No NFS server available, giving up.\n");
return -1;
}
snprintf(nfs_data.hostname, sizeof(nfs_data.hostname),
"%u.%u.%u.%u", NIPQUAD(servaddr));
return 0;
}
/*
* Tell the user what's going on.
*/
#ifdef NFSROOT_DEBUG
static void __init root_nfs_print(void)
{
printk(KERN_NOTICE "Root-NFS: Mounting %s on server %s as root\n",
nfs_path, nfs_data.hostname);
printk(KERN_NOTICE "Root-NFS: rsize = %d, wsize = %d, timeo = %d, retrans = %d\n",
nfs_data.rsize, nfs_data.wsize, nfs_data.timeo, nfs_data.retrans);
printk(KERN_NOTICE "Root-NFS: acreg (min,max) = (%d,%d), acdir (min,max) = (%d,%d)\n",
nfs_data.acregmin, nfs_data.acregmax,
nfs_data.acdirmin, nfs_data.acdirmax);
printk(KERN_NOTICE "Root-NFS: nfsd port = %d, mountd port = %d, flags = %08x\n",
nfs_port, mount_port, nfs_data.flags);
}
#endif
static int __init root_nfs_init(void)
{
#ifdef NFSROOT_DEBUG
nfs_debug |= NFSDBG_ROOT;
#endif
/*
* Decode the root directory path name and NFS options from
* the kernel command line. This has to go here in order to
* be able to use the client IP address for the remote root
* directory (necessary for pure RARP booting).
*/
if (root_nfs_name(nfs_root_name) < 0 ||
root_nfs_addr() < 0)
return -1;
#ifdef NFSROOT_DEBUG
root_nfs_print();
#endif
return 0;
}
/*
* Parse NFS server and directory information passed on the kernel
* command line.
*/
static int __init nfs_root_setup(char *line)
{
ROOT_DEV = Root_NFS;
if (line[0] == '/' || line[0] == ',' || (line[0] >= '0' && line[0] <= '9')) {
strlcpy(nfs_root_name, line, sizeof(nfs_root_name));
} else {
int n = strlen(line) + sizeof(NFS_ROOT) - 1;
if (n >= sizeof(nfs_root_name))
line[sizeof(nfs_root_name) - sizeof(NFS_ROOT) - 2] = '\0';
sprintf(nfs_root_name, NFS_ROOT, line);
}
root_server_addr = root_nfs_parse_addr(nfs_root_name);
return 1;
}
__setup("nfsroot=", nfs_root_setup);
/***************************************************************************
Routines to actually mount the root directory
***************************************************************************/
/*
* Construct sockaddr_in from address and port number.
*/
static inline void
set_sockaddr(struct sockaddr_in *sin, __u32 addr, __u16 port)
{
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = addr;
sin->sin_port = port;
}
/*
* Query server portmapper for the port of a daemon program.
*/
static int __init root_nfs_getport(int program, int version, int proto)
{
struct sockaddr_in sin;
printk(KERN_NOTICE "Looking up port of RPC %d/%d on %u.%u.%u.%u\n",
program, version, NIPQUAD(servaddr));
set_sockaddr(&sin, servaddr, 0);
return rpc_getport_external(&sin, program, version, proto);
}
/*
* Use portmapper to find mountd and nfsd port numbers if not overriden
* by the user. Use defaults if portmapper is not available.
* XXX: Is there any nfs server with no portmapper?
*/
static int __init root_nfs_ports(void)
{
int port;
int nfsd_ver, mountd_ver;
int nfsd_port, mountd_port;
int proto;
if (nfs_data.flags & NFS_MOUNT_VER3) {
nfsd_ver = NFS3_VERSION;
mountd_ver = NFS_MNT3_VERSION;
nfsd_port = NFS_PORT;
mountd_port = NFS_MNT_PORT;
} else {
nfsd_ver = NFS2_VERSION;
mountd_ver = NFS_MNT_VERSION;
nfsd_port = NFS_PORT;
mountd_port = NFS_MNT_PORT;
}
proto = (nfs_data.flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
if (nfs_port < 0) {
if ((port = root_nfs_getport(NFS_PROGRAM, nfsd_ver, proto)) < 0) {
printk(KERN_ERR "Root-NFS: Unable to get nfsd port "
"number from server, using default\n");
port = nfsd_port;
}
nfs_port = htons(port);
dprintk("Root-NFS: Portmapper on server returned %d "
"as nfsd port\n", port);
}
if ((port = root_nfs_getport(NFS_MNT_PROGRAM, mountd_ver, proto)) < 0) {
printk(KERN_ERR "Root-NFS: Unable to get mountd port "
"number from server, using default\n");
port = mountd_port;
}
mount_port = htons(port);
dprintk("Root-NFS: mountd port is %d\n", port);
return 0;
}
/*
* Get a file handle from the server for the directory which is to be
* mounted.
*/
static int __init root_nfs_get_handle(void)
{
struct nfs_fh fh;
struct sockaddr_in sin;
int status;
int protocol = (nfs_data.flags & NFS_MOUNT_TCP) ?
IPPROTO_TCP : IPPROTO_UDP;
int version = (nfs_data.flags & NFS_MOUNT_VER3) ?
NFS_MNT3_VERSION : NFS_MNT_VERSION;
set_sockaddr(&sin, servaddr, mount_port);
status = nfsroot_mount(&sin, nfs_path, &fh, version, protocol);
if (status < 0)
printk(KERN_ERR "Root-NFS: Server returned error %d "
"while mounting %s\n", status, nfs_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, nfs_port);
return (void*)&nfs_data;
}
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