Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 513 insertions, 0 deletions

diff --git a/fs/nfs/nfsroot.c b/fs/nfs/nfsroot.c
new file mode 100644
index 000000000000..fd5bc596fe8a
--- /dev/null
+++ b/fs/nfs/nfsroot.c
@@ -0,0 +1,513 @@
+/*
+ *  $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 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/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,
+	/* 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_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;
+			default : 
+				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_BUFFER_SIZE;
+	nfs_data.wsize    = NFS_DEF_FILE_IO_BUFFER_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;
+}