[net-next-2.6.git] / fs / nfs / nfsroot.c

/*
 *  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 Thümmler	:	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/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/sunrpc/xprtsock.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>

#include "internal.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 __be32 servaddr __initdata = 0;

/* Name of directory to mount */
static char nfs_export_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 __initconst 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:
			case Opt_nointr:
				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 = NFS_DEF_ACREGMIN;
	nfs_data.acregmax = NFS_DEF_ACREGMAX;
	nfs_data.acdirmin = NFS_DEF_ACDIRMIN;
	nfs_data.acdirmax = NFS_DEF_ACDIRMAX;
	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 = 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_export_path, buf, cp);

	return 1;
}


/*
 *  Get NFS server address.
 */
static int __init root_nfs_addr(void)
{
	if ((servaddr = root_server_addr) == htonl(INADDR_NONE)) {
		printk(KERN_ERR "Root-NFS: No NFS server available, giving up.\n");
		return -1;
	}

	snprintf(nfs_data.hostname, sizeof(nfs_data.hostname),
		 "%pI4", &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_export_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, __be32 addr, __be16 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 %pI4\n",
		program, version, &servaddr);
	set_sockaddr(&sin, servaddr, 0);
	return rpcb_getport_sync(&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 = 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 = 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;
	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;
}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Copyright (C) 1995, 1996 Gero Kuhlmann <gero@gkminix.han.de>
	3	*
	4	* Allow an NFS filesystem to be mounted as root. The way this works is:
	5	* (1) Use the IP autoconfig mechanism to set local IP addresses and routes.
	6	* (2) Handle RPC negotiation with the system which replied to RARP or
	7	* was reported as a boot server by BOOTP or manually.
	8	* (3) The actual mounting is done later, when init() is running.
	9	*
	10	*
	11	* Changes:
	12	*
	13	* Alan Cox : Removed get_address name clash with FPU.
	14	* Alan Cox : Reformatted a bit.
	15	* Gero Kuhlmann : Code cleanup
	16	* Michael Rausch : Fixed recognition of an incoming RARP answer.
	17	* Martin Mares : (2.0) Auto-configuration via BOOTP supported.
	18	* Martin Mares : Manual selection of interface & BOOTP/RARP.
	19	* Martin Mares : Using network routes instead of host routes,
	20	* allowing the default configuration to be used
	21	* for normal operation of the host.
	22	* Martin Mares : Randomized timer with exponential backoff
	23	* installed to minimize network congestion.
	24	* Martin Mares : Code cleanup.
	25	* Martin Mares : (2.1) BOOTP and RARP made configuration options.
	26	* Martin Mares : Server hostname generation fixed.
	27	* Gerd Knorr : Fixed wired inode handling
	28	* Martin Mares : (2.2) "0.0.0.0" addresses from command line ignored.
	29	* Martin Mares : RARP replies not tested for server address.
	30	* Gero Kuhlmann : (2.3) Some bug fixes and code cleanup again (please
	31	* send me your new patches _before_ bothering
	32	* Linus so that I don' always have to cleanup
	33	* _afterwards_ - thanks)
	34	* Gero Kuhlmann : Last changes of Martin Mares undone.
	35	* Gero Kuhlmann : RARP replies are tested for specified server
	36	* again. However, it's now possible to have
	37	* different RARP and NFS servers.
	38	* Gero Kuhlmann : "0.0.0.0" addresses from command line are
	39	* now mapped to INADDR_NONE.
	40	* Gero Kuhlmann : Fixed a bug which prevented BOOTP path name
	41	* from being used (thanks to Leo Spiekman)
	42	* Andy Walker : Allow to specify the NFS server in nfs_root
	43	* without giving a path name
96de0e25	44	* Swen Thümmler : Allow to specify the NFS options in nfs_root
1da177e4 LT	45	* without giving a path name. Fix BOOTP request
	46	* for domainname (domainname is NIS domain, not
	47	* DNS domain!). Skip dummy devices for BOOTP.
	48	* Jacek Zapala : Fixed a bug which prevented server-ip address
	49	* from nfsroot parameter from being used.
	50	* Olaf Kirch : Adapted to new NFS code.
	51	* Jakub Jelinek : Free used code segment.
	52	* Marko Kohtala : Fixed some bugs.
	53	* Martin Mares : Debug message cleanup
	54	* Martin Mares : Changed to use the new generic IP layer autoconfig
	55	* code. BOOTP and RARP moved there.
	56	* Martin Mares : Default path now contains host name instead of
	57	* host IP address (but host name defaults to IP
	58	* address anyway).
	59	* Martin Mares : Use root_server_addr appropriately during setup.
	60	* Martin Mares : Rewrote parameter parsing, now hopefully giving
	61	* correct overriding.
	62	* Trond Myklebust : Add in preliminary support for NFSv3 and TCP.
	63	* Fix bug in root_nfs_addr(). nfs_data.namlen
	64	* is NOT for the length of the hostname.
	65	* Hua Qin : Support for mounting root file system via
	66	* NFS over TCP.
	67	* Fabian Frederick: Option parser rebuilt (using parser lib)
	68	*/
	69
1da177e4 LT	70	#include <linux/types.h>
	71	#include <linux/string.h>
	72	#include <linux/kernel.h>
	73	#include <linux/time.h>
	74	#include <linux/fs.h>
	75	#include <linux/init.h>
	76	#include <linux/sunrpc/clnt.h>
0896a725	77	#include <linux/sunrpc/xprtsock.h>
1da177e4 LT	78	#include <linux/nfs.h>
	79	#include <linux/nfs_fs.h>
	80	#include <linux/nfs_mount.h>
	81	#include <linux/in.h>
	82	#include <linux/major.h>
	83	#include <linux/utsname.h>
	84	#include <linux/inet.h>
	85	#include <linux/root_dev.h>
	86	#include <net/ipconfig.h>
	87	#include <linux/parser.h>
	88
146ec944 CL	89	#include "internal.h"
146ec944 CL	90
1da177e4 LT	91	/* Define this to allow debugging output */
	92	#undef NFSROOT_DEBUG
	93	#define NFSDBG_FACILITY NFSDBG_ROOT
	94
	95	/* Default path we try to mount. "%s" gets replaced by our IP address */
	96	#define NFS_ROOT "/tftpboot/%s"
	97
	98	/* Parameters passed from the kernel command line */
	99	static char nfs_root_name[256] __initdata = "";
	100
	101	/* Address of NFS server */
5a874db4	102	static __be32 servaddr __initdata = 0;
1da177e4 LT	103
1da177e4 LT	104	/* Name of directory to mount */
7b5d2b98	105	static char nfs_export_path[NFS_MAXPATHLEN] __initdata = { 0, };
1da177e4 LT	106
	107	/* NFS-related data */
	108	static struct nfs_mount_data nfs_data __initdata = { 0, };/* NFS mount info */
	109	static int nfs_port __initdata = 0; /* Port to connect to for NFS */
	110	static int mount_port __initdata = 0; /* Mount daemon port number */
	111
	112
	113	/***************************************************************************
	114
	115	Parsing of options
	116
	117	***************************************************************************/
	118
	119	enum {
	120	/* Options that take integer arguments */
	121	Opt_port, Opt_rsize, Opt_wsize, Opt_timeo, Opt_retrans, Opt_acregmin,
	122	Opt_acregmax, Opt_acdirmin, Opt_acdirmax,
	123	/* Options that take no arguments */
	124	Opt_soft, Opt_hard, Opt_intr,
	125	Opt_nointr, Opt_posix, Opt_noposix, Opt_cto, Opt_nocto, Opt_ac,
	126	Opt_noac, Opt_lock, Opt_nolock, Opt_v2, Opt_v3, Opt_udp, Opt_tcp,
b7fa0554	127	Opt_acl, Opt_noacl,
1da177e4 LT	128	/* Error token */
	129	Opt_err
	130	};
	131
a447c093	132	static match_table_t __initconst tokens = {
1da177e4 LT	133	{Opt_port, "port=%u"},
	134	{Opt_rsize, "rsize=%u"},
	135	{Opt_wsize, "wsize=%u"},
	136	{Opt_timeo, "timeo=%u"},
	137	{Opt_retrans, "retrans=%u"},
	138	{Opt_acregmin, "acregmin=%u"},
	139	{Opt_acregmax, "acregmax=%u"},
	140	{Opt_acdirmin, "acdirmin=%u"},
	141	{Opt_acdirmax, "acdirmax=%u"},
	142	{Opt_soft, "soft"},
	143	{Opt_hard, "hard"},
	144	{Opt_intr, "intr"},
	145	{Opt_nointr, "nointr"},
	146	{Opt_posix, "posix"},
	147	{Opt_noposix, "noposix"},
	148	{Opt_cto, "cto"},
	149	{Opt_nocto, "nocto"},
	150	{Opt_ac, "ac"},
	151	{Opt_noac, "noac"},
	152	{Opt_lock, "lock"},
	153	{Opt_nolock, "nolock"},
	154	{Opt_v2, "nfsvers=2"},
	155	{Opt_v2, "v2"},
	156	{Opt_v3, "nfsvers=3"},
	157	{Opt_v3, "v3"},
	158	{Opt_udp, "proto=udp"},
	159	{Opt_udp, "udp"},
	160	{Opt_tcp, "proto=tcp"},
	161	{Opt_tcp, "tcp"},
b7fa0554 AG	162	{Opt_acl, "acl"},
b7fa0554 AG	163	{Opt_noacl, "noacl"},
1da177e4 LT	164	{Opt_err, NULL}
	165
	166	};
	167
	168	/*
	169	* Parse option string.
	170	*/
	171
	172	static int __init root_nfs_parse(char name, char buf)
	173	{
	174
	175	char *p;
	176	substring_t args[MAX_OPT_ARGS];
	177	int option;
	178
	179	if (!name)
	180	return 1;
	181
	182	/* Set the NFS remote path */
	183	p = strsep(&name, ",");
	184	if (p[0] != '\0' && strcmp(p, "default") != 0)
	185	strlcpy(buf, p, NFS_MAXPATHLEN);
	186
	187	while ((p = strsep (&name, ",")) != NULL) {
	188	int token;
	189	if (!*p)
	190	continue;
	191	token = match_token(p, tokens, args);
	192
	193	/* %u tokens only. Beware if you add new tokens! */
	194	if (token < Opt_soft && match_int(&args[0], &option))
	195	return 0;
	196	switch (token) {
	197	case Opt_port:
	198	nfs_port = option;
	199	break;
	200	case Opt_rsize:
	201	nfs_data.rsize = option;
	202	break;
	203	case Opt_wsize:
	204	nfs_data.wsize = option;
	205	break;
	206	case Opt_timeo:
	207	nfs_data.timeo = option;
	208	break;
	209	case Opt_retrans:
	210	nfs_data.retrans = option;
	211	break;
	212	case Opt_acregmin:
	213	nfs_data.acregmin = option;
	214	break;
	215	case Opt_acregmax:
	216	nfs_data.acregmax = option;
	217	break;
	218	case Opt_acdirmin:
	219	nfs_data.acdirmin = option;
	220	break;
	221	case Opt_acdirmax:
	222	nfs_data.acdirmax = option;
	223	break;
	224	case Opt_soft:
	225	nfs_data.flags \|= NFS_MOUNT_SOFT;
	226	break;
	227	case Opt_hard:
228	nfs_data.flags &= ~NFS_MOUNT_SOFT;
229	break;
230	case Opt_intr:
1da177e4	231	case Opt_nointr:
1da177e4 LT	232	break;
	233	case Opt_posix:
	234	nfs_data.flags \|= NFS_MOUNT_POSIX;
	235	break;
	236	case Opt_noposix:
	237	nfs_data.flags &= ~NFS_MOUNT_POSIX;
	238	break;
	239	case Opt_cto:
	240	nfs_data.flags &= ~NFS_MOUNT_NOCTO;
	241	break;
	242	case Opt_nocto:
	243	nfs_data.flags \|= NFS_MOUNT_NOCTO;
	244	break;
	245	case Opt_ac:
	246	nfs_data.flags &= ~NFS_MOUNT_NOAC;
	247	break;
	248	case Opt_noac:
	249	nfs_data.flags \|= NFS_MOUNT_NOAC;
	250	break;
	251	case Opt_lock:
	252	nfs_data.flags &= ~NFS_MOUNT_NONLM;
	253	break;
	254	case Opt_nolock:
	255	nfs_data.flags \|= NFS_MOUNT_NONLM;
	256	break;
	257	case Opt_v2:
	258	nfs_data.flags &= ~NFS_MOUNT_VER3;
	259	break;
	260	case Opt_v3:
	261	nfs_data.flags \|= NFS_MOUNT_VER3;
	262	break;
	263	case Opt_udp:
	264	nfs_data.flags &= ~NFS_MOUNT_TCP;
	265	break;
	266	case Opt_tcp:
	267	nfs_data.flags \|= NFS_MOUNT_TCP;
	268	break;
b7fa0554 AG	269	case Opt_acl:
	270	nfs_data.flags &= ~NFS_MOUNT_NOACL;
	271	break;
	272	case Opt_noacl:
	273	nfs_data.flags \|= NFS_MOUNT_NOACL;
	274	break;
21b6bf14 JD	275	default:
	276	printk(KERN_WARNING "Root-NFS: unknown "
	277	"option: %s\n", p);
1da177e4 LT	278	return 0;
	279	}
	280	}
	281
	282	return 1;
	283	}
	284
	285	/*
	286	* Prepare the NFS data structure and parse all options.
	287	*/
	288	static int __init root_nfs_name(char *name)
	289	{
	290	static char buf[NFS_MAXPATHLEN] __initdata;
	291	char *cp;
	292
	293	/* Set some default values */
	294	memset(&nfs_data, 0, sizeof(nfs_data));
	295	nfs_port = -1;
	296	nfs_data.version = NFS_MOUNT_VERSION;
	297	nfs_data.flags = NFS_MOUNT_NONLM; /* No lockd in nfs root yet */
40859d7e CL	298	nfs_data.rsize = NFS_DEF_FILE_IO_SIZE;
40859d7e CL	299	nfs_data.wsize = NFS_DEF_FILE_IO_SIZE;
0e0cab74 CL	300	nfs_data.acregmin = NFS_DEF_ACREGMIN;
	301	nfs_data.acregmax = NFS_DEF_ACREGMAX;
	302	nfs_data.acdirmin = NFS_DEF_ACDIRMIN;
	303	nfs_data.acdirmax = NFS_DEF_ACDIRMAX;
1da177e4 LT	304	strcpy(buf, NFS_ROOT);
	305
	306	/* Process options received from the remote server */
	307	root_nfs_parse(root_server_path, buf);
	308
	309	/* Override them by options set on kernel command-line */
	310	root_nfs_parse(name, buf);
	311
e9ff3990	312	cp = utsname()->nodename;
1da177e4 LT	313	if (strlen(buf) + strlen(cp) > NFS_MAXPATHLEN) {
	314	printk(KERN_ERR "Root-NFS: Pathname for remote directory too long.\n");
	315	return -1;
	316	}
7b5d2b98	317	sprintf(nfs_export_path, buf, cp);
1da177e4 LT	318
	319	return 1;
	320	}
	321
	322
	323	/*
	324	* Get NFS server address.
	325	*/
	326	static int __init root_nfs_addr(void)
	327	{
5a874db4	328	if ((servaddr = root_server_addr) == htonl(INADDR_NONE)) {
1da177e4 LT	329	printk(KERN_ERR "Root-NFS: No NFS server available, giving up.\n");
	330	return -1;
	331	}
	332
	333	snprintf(nfs_data.hostname, sizeof(nfs_data.hostname),
be859405	334	"%pI4", &servaddr);
1da177e4 LT	335	return 0;
	336	}
	337
	338	/*
	339	* Tell the user what's going on.
	340	*/
	341	#ifdef NFSROOT_DEBUG
	342	static void __init root_nfs_print(void)
	343	{
	344	printk(KERN_NOTICE "Root-NFS: Mounting %s on server %s as root\n",
7b5d2b98	345	nfs_export_path, nfs_data.hostname);
1da177e4 LT	346	printk(KERN_NOTICE "Root-NFS: rsize = %d, wsize = %d, timeo = %d, retrans = %d\n",
	347	nfs_data.rsize, nfs_data.wsize, nfs_data.timeo, nfs_data.retrans);
	348	printk(KERN_NOTICE "Root-NFS: acreg (min,max) = (%d,%d), acdir (min,max) = (%d,%d)\n",
	349	nfs_data.acregmin, nfs_data.acregmax,
	350	nfs_data.acdirmin, nfs_data.acdirmax);
	351	printk(KERN_NOTICE "Root-NFS: nfsd port = %d, mountd port = %d, flags = %08x\n",
	352	nfs_port, mount_port, nfs_data.flags);
	353	}
	354	#endif
	355
	356
	357	static int __init root_nfs_init(void)
	358	{
	359	#ifdef NFSROOT_DEBUG
	360	nfs_debug \|= NFSDBG_ROOT;
	361	#endif
	362
	363	/*
	364	* Decode the root directory path name and NFS options from
	365	* the kernel command line. This has to go here in order to
	366	* be able to use the client IP address for the remote root
	367	* directory (necessary for pure RARP booting).
	368	*/
	369	if (root_nfs_name(nfs_root_name) < 0 \|\|
	370	root_nfs_addr() < 0)
	371	return -1;
	372
	373	#ifdef NFSROOT_DEBUG
	374	root_nfs_print();
	375	#endif
	376
	377	return 0;
	378	}
	379
	380
	381	/*
	382	* Parse NFS server and directory information passed on the kernel
	383	* command line.
	384	*/
	385	static int __init nfs_root_setup(char *line)
	386	{
	387	ROOT_DEV = Root_NFS;
	388	if (line[0] == '/' \|\| line[0] == ',' \|\| (line[0] >= '0' && line[0] <= '9')) {
	389	strlcpy(nfs_root_name, line, sizeof(nfs_root_name));
	390	} else {
	391	int n = strlen(line) + sizeof(NFS_ROOT) - 1;
	392	if (n >= sizeof(nfs_root_name))
	393	line[sizeof(nfs_root_name) - sizeof(NFS_ROOT) - 2] = '\0';
	394	sprintf(nfs_root_name, NFS_ROOT, line);
	395	}
	396	root_server_addr = root_nfs_parse_addr(nfs_root_name);
	397	return 1;
	398	}
	399
	400	__setup("nfsroot=", nfs_root_setup);
	401
	402	/***************************************************************************
	403
	404	Routines to actually mount the root directory
	405
	406	***************************************************************************/
	407
	408	/*
	409	* Construct sockaddr_in from address and port number.
410	*/
411	static inline void
5a874db4	412	set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
1da177e4 LT	413	{
	414	sin->sin_family = AF_INET;
	415	sin->sin_addr.s_addr = addr;
	416	sin->sin_port = port;
	417	}
	418
	419	/*
	420	* Query server portmapper for the port of a daemon program.
	421	*/
	422	static int __init root_nfs_getport(int program, int version, int proto)
	423	{
	424	struct sockaddr_in sin;
	425
be859405 HH	426	printk(KERN_NOTICE "Looking up port of RPC %d/%d on %pI4\n",
be859405 HH	427	program, version, &servaddr);
1da177e4	428	set_sockaddr(&sin, servaddr, 0);
cce63cd6	429	return rpcb_getport_sync(&sin, program, version, proto);
1da177e4 LT	430	}
	431
	432
	433	/*
	434	* Use portmapper to find mountd and nfsd port numbers if not overriden
	435	* by the user. Use defaults if portmapper is not available.
	436	* XXX: Is there any nfs server with no portmapper?
	437	*/
	438	static int __init root_nfs_ports(void)
	439	{
	440	int port;
	441	int nfsd_ver, mountd_ver;
	442	int nfsd_port, mountd_port;
	443	int proto;
	444
	445	if (nfs_data.flags & NFS_MOUNT_VER3) {
	446	nfsd_ver = NFS3_VERSION;
	447	mountd_ver = NFS_MNT3_VERSION;
	448	nfsd_port = NFS_PORT;
	449	mountd_port = NFS_MNT_PORT;
	450	} else {
	451	nfsd_ver = NFS2_VERSION;
	452	mountd_ver = NFS_MNT_VERSION;
	453	nfsd_port = NFS_PORT;
	454	mountd_port = NFS_MNT_PORT;
	455	}
	456
	457	proto = (nfs_data.flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
	458
	459	if (nfs_port < 0) {
	460	if ((port = root_nfs_getport(NFS_PROGRAM, nfsd_ver, proto)) < 0) {
	461	printk(KERN_ERR "Root-NFS: Unable to get nfsd port "
	462	"number from server, using default\n");
	463	port = nfsd_port;
	464	}
8854eddb	465	nfs_port = port;
1da177e4 LT	466	dprintk("Root-NFS: Portmapper on server returned %d "
	467	"as nfsd port\n", port);
	468	}
	469
	470	if ((port = root_nfs_getport(NFS_MNT_PROGRAM, mountd_ver, proto)) < 0) {
	471	printk(KERN_ERR "Root-NFS: Unable to get mountd port "
	472	"number from server, using default\n");
	473	port = mountd_port;
	474	}
5a874db4	475	mount_port = port;
1da177e4 LT	476	dprintk("Root-NFS: mountd port is %d\n", port);
	477
	478	return 0;
	479	}
	480
	481
	482	/*
	483	* Get a file handle from the server for the directory which is to be
	484	* mounted.
	485	*/
	486	static int __init root_nfs_get_handle(void)
	487	{
	488	struct nfs_fh fh;
	489	struct sockaddr_in sin;
c5d120f8 CL	490	struct nfs_mount_request request = {
	491	.sap = (struct sockaddr *)&sin,
	492	.salen = sizeof(sin),
	493	.dirpath = nfs_export_path,
	494	.version = (nfs_data.flags & NFS_MOUNT_VER3) ?
	495	NFS_MNT3_VERSION : NFS_MNT_VERSION,
	496	.protocol = (nfs_data.flags & NFS_MOUNT_TCP) ?
	497	XPRT_TRANSPORT_TCP : XPRT_TRANSPORT_UDP,
	498	.fh = &fh,
	499	};
1da177e4	500	int status;
1da177e4	501
5a874db4	502	set_sockaddr(&sin, servaddr, htons(mount_port));
c5d120f8	503	status = nfs_mount(&request);
1da177e4 LT	504	if (status < 0)
1da177e4 LT	505	printk(KERN_ERR "Root-NFS: Server returned error %d "
7b5d2b98	506	"while mounting %s\n", status, nfs_export_path);
1da177e4 LT	507	else {
	508	nfs_data.root.size = fh.size;
	509	memcpy(nfs_data.root.data, fh.data, fh.size);
	510	}
	511
	512	return status;
	513	}
	514
	515	/*
	516	* Get the NFS port numbers and file handle, and return the prepared 'data'
	517	* argument for mount() if everything went OK. Return NULL otherwise.
	518	*/
	519	void * __init nfs_root_data(void)
	520	{
	521	if (root_nfs_init() < 0
	522	\|\| root_nfs_ports() < 0
	523	\|\| root_nfs_get_handle() < 0)
	524	return NULL;
5a874db4	525	set_sockaddr((struct sockaddr_in *) &nfs_data.addr, servaddr, htons(nfs_port));
1da177e4 LT	526	return (void*)&nfs_data;
1da177e4 LT	527	}