Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Jan Engelhardt | 96de0e2 | 2007-10-19 23:21:04 +0200 | [diff] [blame] | 44 | * Swen Thümmler : Allow to specify the NFS options in nfs_root |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
\"Talpey, Thomas\ | 0896a72 | 2007-09-10 13:48:23 -0400 | [diff] [blame] | 77 | #include <linux/sunrpc/xprtsock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Chuck Lever | 146ec94 | 2008-12-23 15:21:34 -0500 | [diff] [blame] | 89 | #include "internal.h" |
| 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Al Viro | 5a874db | 2006-11-08 00:19:38 -0800 | [diff] [blame] | 102 | static __be32 servaddr __initdata = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | /* Name of directory to mount */ |
Chuck Lever | 7b5d2b9 | 2008-12-23 15:21:34 -0500 | [diff] [blame] | 105 | static char nfs_export_path[NFS_MAXPATHLEN] __initdata = { 0, }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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, |
Andreas Gruenbacher | b7fa055 | 2005-06-22 17:16:27 +0000 | [diff] [blame] | 127 | Opt_acl, Opt_noacl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | /* Error token */ |
| 129 | Opt_err |
| 130 | }; |
| 131 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 132 | static match_table_t __initconst tokens = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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"}, |
Andreas Gruenbacher | b7fa055 | 2005-06-22 17:16:27 +0000 | [diff] [blame] | 162 | {Opt_acl, "acl"}, |
| 163 | {Opt_noacl, "noacl"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | case Opt_nointr: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Andreas Gruenbacher | b7fa055 | 2005-06-22 17:16:27 +0000 | [diff] [blame] | 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; |
Jorn Dreyer | 21b6bf1 | 2006-01-08 01:03:30 -0800 | [diff] [blame] | 275 | default: |
| 276 | printk(KERN_WARNING "Root-NFS: unknown " |
| 277 | "option: %s\n", p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Chuck Lever | 40859d7 | 2005-11-30 18:09:02 -0500 | [diff] [blame] | 298 | nfs_data.rsize = NFS_DEF_FILE_IO_SIZE; |
| 299 | nfs_data.wsize = NFS_DEF_FILE_IO_SIZE; |
Chuck Lever | 0e0cab7 | 2008-06-26 17:47:12 -0400 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Serge E. Hallyn | e9ff399 | 2006-10-02 02:18:11 -0700 | [diff] [blame] | 312 | cp = utsname()->nodename; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Chuck Lever | 7b5d2b9 | 2008-12-23 15:21:34 -0500 | [diff] [blame] | 317 | sprintf(nfs_export_path, buf, cp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
| 319 | return 1; |
| 320 | } |
| 321 | |
| 322 | |
| 323 | /* |
| 324 | * Get NFS server address. |
| 325 | */ |
| 326 | static int __init root_nfs_addr(void) |
| 327 | { |
Al Viro | 5a874db | 2006-11-08 00:19:38 -0800 | [diff] [blame] | 328 | if ((servaddr = root_server_addr) == htonl(INADDR_NONE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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), |
| 334 | "%u.%u.%u.%u", NIPQUAD(servaddr)); |
| 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", |
Chuck Lever | 7b5d2b9 | 2008-12-23 15:21:34 -0500 | [diff] [blame] | 345 | nfs_export_path, nfs_data.hostname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Al Viro | 5a874db | 2006-11-08 00:19:38 -0800 | [diff] [blame] | 412 | set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 426 | printk(KERN_NOTICE "Looking up port of RPC %d/%d on %u.%u.%u.%u\n", |
| 427 | program, version, NIPQUAD(servaddr)); |
| 428 | set_sockaddr(&sin, servaddr, 0); |
Chuck Lever | cce63cd | 2007-07-01 12:13:12 -0400 | [diff] [blame] | 429 | return rpcb_getport_sync(&sin, program, version, proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Al Viro | 8854edd | 2006-01-04 01:44:17 -0500 | [diff] [blame] | 465 | nfs_port = port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | dprintk("Root-NFS: Portmapper on server returned %d " |
| 467 | "as nfsd port\n", port); |
| 468 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Al Viro | 5a874db | 2006-11-08 00:19:38 -0800 | [diff] [blame] | 475 | mount_port = port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Chuck Lever | c5d120f | 2008-12-23 15:21:35 -0500 | [diff] [blame] | 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 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | |
Al Viro | 5a874db | 2006-11-08 00:19:38 -0800 | [diff] [blame] | 502 | set_sockaddr(&sin, servaddr, htons(mount_port)); |
Chuck Lever | c5d120f | 2008-12-23 15:21:35 -0500 | [diff] [blame] | 503 | status = nfs_mount(&request); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | if (status < 0) |
| 505 | printk(KERN_ERR "Root-NFS: Server returned error %d " |
Chuck Lever | 7b5d2b9 | 2008-12-23 15:21:34 -0500 | [diff] [blame] | 506 | "while mounting %s\n", status, nfs_export_path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Al Viro | 5a874db | 2006-11-08 00:19:38 -0800 | [diff] [blame] | 525 | set_sockaddr((struct sockaddr_in *) &nfs_data.addr, servaddr, htons(nfs_port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | return (void*)&nfs_data; |
| 527 | } |