+++ /dev/null
-/*
- * $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.
- */
-
-#include <linux/config.h>
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/kernel.h>
-#include <linux/sched.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/inet.h>
-#include <linux/major.h>
-#include <linux/utsname.h>
-#include <net/ipconfig.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
-
- ***************************************************************************/
-
-/*
- * The following integer options are recognized
- */
-static struct nfs_int_opts {
- char *name;
- int *val;
-} root_int_opts[] __initdata = {
- { "port", &nfs_port },
- { "rsize", &nfs_data.rsize },
- { "wsize", &nfs_data.wsize },
- { "timeo", &nfs_data.timeo },
- { "retrans", &nfs_data.retrans },
- { "acregmin", &nfs_data.acregmin },
- { "acregmax", &nfs_data.acregmax },
- { "acdirmin", &nfs_data.acdirmin },
- { "acdirmax", &nfs_data.acdirmax },
- { NULL, NULL }
-};
-
-
-/*
- * And now the flag options
- */
-static struct nfs_bool_opts {
- char *name;
- int and_mask;
- int or_mask;
-} root_bool_opts[] __initdata = {
- { "soft", ~NFS_MOUNT_SOFT, NFS_MOUNT_SOFT },
- { "hard", ~NFS_MOUNT_SOFT, 0 },
- { "intr", ~NFS_MOUNT_INTR, NFS_MOUNT_INTR },
- { "nointr", ~NFS_MOUNT_INTR, 0 },
- { "posix", ~NFS_MOUNT_POSIX, NFS_MOUNT_POSIX },
- { "noposix", ~NFS_MOUNT_POSIX, 0 },
- { "cto", ~NFS_MOUNT_NOCTO, 0 },
- { "nocto", ~NFS_MOUNT_NOCTO, NFS_MOUNT_NOCTO },
- { "ac", ~NFS_MOUNT_NOAC, 0 },
- { "noac", ~NFS_MOUNT_NOAC, NFS_MOUNT_NOAC },
- { "lock", ~NFS_MOUNT_NONLM, 0 },
- { "nolock", ~NFS_MOUNT_NONLM, NFS_MOUNT_NONLM },
-#ifdef CONFIG_NFS_V3
- { "v2", ~NFS_MOUNT_VER3, 0 },
- { "v3", ~NFS_MOUNT_VER3, NFS_MOUNT_VER3 },
-#endif
- { "udp", ~NFS_MOUNT_TCP, 0 },
- { "tcp", ~NFS_MOUNT_TCP, NFS_MOUNT_TCP },
- { "broken_suid",~NFS_MOUNT_BROKEN_SUID, NFS_MOUNT_BROKEN_SUID },
- { NULL, 0, 0 }
-};
-
-
-/*
- * Extract IP address from the parameter string if needed. Note that we
- * need to have root_server_addr set _before_ IPConfig gets called as it
- * can override it.
- */
-static void __init root_nfs_parse_addr(char *name)
-{
- int octets = 0;
- char *cp, *cq;
-
- cp = cq = name;
- while (octets < 4) {
- while (*cp >= '0' && *cp <= '9')
- cp++;
- if (cp == cq || cp - cq > 3)
- break;
- if (*cp == '.' || octets == 3)
- octets++;
- if (octets < 4)
- cp++;
- cq = cp;
- }
- if (octets == 4 && (*cp == ':' || *cp == '\0')) {
- if (*cp == ':')
- *cp++ = '\0';
- root_server_addr = in_aton(name);
- strcpy(name, cp);
- }
-}
-
-
-/*
- * Parse option string.
- */
-static void __init root_nfs_parse(char *name, char *buf)
-{
- char *options, *val, *cp;
-
- if ((options = strchr(name, ','))) {
- *options++ = 0;
- cp = strtok(options, ",");
- while (cp) {
- if ((val = strchr(cp, '='))) {
- struct nfs_int_opts *opts = root_int_opts;
- *val++ = '\0';
- while (opts->name && strcmp(opts->name, cp))
- opts++;
- if (opts->name)
- *(opts->val) = (int) simple_strtoul(val, NULL, 10);
- } else {
- struct nfs_bool_opts *opts = root_bool_opts;
- while (opts->name && strcmp(opts->name, cp))
- opts++;
- if (opts->name) {
- nfs_data.flags &= opts->and_mask;
- nfs_data.flags |= opts->or_mask;
- }
- }
- cp = strtok(NULL, ",");
- }
- }
- if (name[0] && strcmp(name, "default")) {
- strncpy(buf, name, NFS_MAXPATHLEN-1);
- buf[NFS_MAXPATHLEN-1] = 0;
- }
-}
-
-
-/*
- * Prepare the NFS data structure and parse all options.
- */
-static int __init root_nfs_name(char *name)
-{
- char buf[NFS_MAXPATHLEN];
- 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.bsize = 0;
- nfs_data.timeo = 7;
- nfs_data.retrans = 3;
- 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;
- }
-
- strncpy(nfs_data.hostname, in_ntoa(servaddr), sizeof(nfs_data.hostname)-1);
- 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
-
-
-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.
- */
-int __init nfs_root_setup(char *line)
-{
- ROOT_DEV = MKDEV(UNNAMED_MAJOR, 255);
- if (line[0] == '/' || line[0] == ',' || (line[0] >= '0' && line[0] <= '9')) {
- strncpy(nfs_root_name, line, sizeof(nfs_root_name));
- nfs_root_name[sizeof(nfs_root_name)-1] = '\0';
- } else {
- int n = strlen(line) + strlen(NFS_ROOT);
- if (n >= sizeof(nfs_root_name))
- line[sizeof(nfs_root_name) - strlen(NFS_ROOT) - 1] = '\0';
- sprintf(nfs_root_name, NFS_ROOT, line);
- }
- 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 %s\n",
- program, version, in_ntoa(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 sockaddr_in sin;
- int status;
-
- set_sockaddr(&sin, servaddr, mount_port);
- if (nfs_data.flags & NFS_MOUNT_VER3)
- status = nfs3_mount(&sin, nfs_path, &nfs_data.root);
- else
- status = nfs_mount(&sin, nfs_path, &nfs_data.root);
- if (status < 0)
- printk(KERN_ERR "Root-NFS: Server returned error %d "
- "while mounting %s\n", status, nfs_path);
-
- return status;
-}
-
-/*
- * Get the NFS port numbers and file handle, and return the prepared 'data'
- * argument for ->read_super() 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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