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authorLinus Torvalds <torvalds@linux-foundation.org>2010-10-25 16:48:29 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-25 16:48:29 -0400
commit74eb94b218d087798a52c0b4f1379b635287a4b8 (patch)
tree4e467c3014c2b1169f6f71d88cf5d1598f3ce28e /fs/nfs/nfsroot.c
parent7b6181e06841f5ad15c4ff708b967b4db65a64de (diff)
parent9a84d38031c258a17bb39beed1e500eadee67407 (diff)
Merge branch 'nfs-for-2.6.37' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
* 'nfs-for-2.6.37' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6: (67 commits) SUNRPC: Cleanup duplicate assignment in rpcauth_refreshcred nfs: fix unchecked value Ask for time_delta during fsinfo probe Revalidate caches on lock SUNRPC: After calling xprt_release(), we must restart from call_reserve NFSv4: Fix up the 'dircount' hint in encode_readdir NFSv4: Clean up nfs4_decode_dirent NFSv4: nfs4_decode_dirent must clear entry->fattr->valid NFSv4: Fix a regression in decode_getfattr NFSv4: Fix up decode_attr_filehandle() to handle the case of empty fh pointer NFS: Ensure we check all allocation return values in new readdir code NFS: Readdir plus in v4 NFS: introduce generic decode_getattr function NFS: check xdr_decode for errors NFS: nfs_readdir_filler catch all errors NFS: readdir with vmapped pages NFS: remove page size checking code NFS: decode_dirent should use an xdr_stream SUNRPC: Add a helper function xdr_inline_peek NFS: remove readdir plus limit ...
Diffstat (limited to 'fs/nfs/nfsroot.c')
-rw-r--r--fs/nfs/nfsroot.c566
1 files changed, 170 insertions, 396 deletions
diff --git a/fs/nfs/nfsroot.c b/fs/nfs/nfsroot.c
index df101d9f546a..460df3652889 100644
--- a/fs/nfs/nfsroot.c
+++ b/fs/nfs/nfsroot.c
@@ -3,9 +3,10 @@
3 * 3 *
4 * Allow an NFS filesystem to be mounted as root. The way this works is: 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. 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 6 * (2) Construct the device string and the options string using DHCP
7 * was reported as a boot server by BOOTP or manually. 7 * option 17 and/or kernel command line options.
8 * (3) The actual mounting is done later, when init() is running. 8 * (3) When mount_root() sets up the root file system, pass these strings
9 * to the NFS client's regular mount interface via sys_mount().
9 * 10 *
10 * 11 *
11 * Changes: 12 * Changes:
@@ -65,470 +66,243 @@
65 * Hua Qin : Support for mounting root file system via 66 * Hua Qin : Support for mounting root file system via
66 * NFS over TCP. 67 * NFS over TCP.
67 * Fabian Frederick: Option parser rebuilt (using parser lib) 68 * Fabian Frederick: Option parser rebuilt (using parser lib)
68*/ 69 * Chuck Lever : Use super.c's text-based mount option parsing
70 * Chuck Lever : Add "nfsrootdebug".
71 */
69 72
70#include <linux/types.h> 73#include <linux/types.h>
71#include <linux/string.h> 74#include <linux/string.h>
72#include <linux/kernel.h>
73#include <linux/time.h>
74#include <linux/fs.h>
75#include <linux/init.h> 75#include <linux/init.h>
76#include <linux/sunrpc/clnt.h>
77#include <linux/sunrpc/xprtsock.h>
78#include <linux/nfs.h> 76#include <linux/nfs.h>
79#include <linux/nfs_fs.h> 77#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> 78#include <linux/utsname.h>
84#include <linux/inet.h>
85#include <linux/root_dev.h> 79#include <linux/root_dev.h>
86#include <net/ipconfig.h> 80#include <net/ipconfig.h>
87#include <linux/parser.h>
88 81
89#include "internal.h" 82#include "internal.h"
90 83
91/* Define this to allow debugging output */
92#undef NFSROOT_DEBUG
93#define NFSDBG_FACILITY NFSDBG_ROOT 84#define NFSDBG_FACILITY NFSDBG_ROOT
94 85
95/* Default port to use if server is not running a portmapper */
96#define NFS_MNT_PORT 627
97
98/* Default path we try to mount. "%s" gets replaced by our IP address */ 86/* Default path we try to mount. "%s" gets replaced by our IP address */
99#define NFS_ROOT "/tftpboot/%s" 87#define NFS_ROOT "/tftpboot/%s"
100 88
101/* Parameters passed from the kernel command line */ 89/* Parameters passed from the kernel command line */
102static char nfs_root_name[256] __initdata = ""; 90static char nfs_root_parms[256] __initdata = "";
91
92/* Text-based mount options passed to super.c */
93static char nfs_root_options[256] __initdata = "";
103 94
104/* Address of NFS server */ 95/* Address of NFS server */
105static __be32 servaddr __initdata = 0; 96static __be32 servaddr __initdata = htonl(INADDR_NONE);
106 97
107/* Name of directory to mount */ 98/* Name of directory to mount */
108static char nfs_export_path[NFS_MAXPATHLEN + 1] __initdata = { 0, }; 99static char nfs_export_path[NFS_MAXPATHLEN + 1] __initdata = "";
109 100
110/* NFS-related data */ 101/* server:export path string passed to super.c */
111static struct nfs_mount_data nfs_data __initdata = { 0, };/* NFS mount info */ 102static char nfs_root_device[NFS_MAXPATHLEN + 1] __initdata = "";
112static int nfs_port __initdata = 0; /* Port to connect to for NFS */
113static int mount_port __initdata = 0; /* Mount daemon port number */
114
115
116/***************************************************************************
117
118 Parsing of options
119
120 ***************************************************************************/
121
122enum {
123 /* Options that take integer arguments */
124 Opt_port, Opt_rsize, Opt_wsize, Opt_timeo, Opt_retrans, Opt_acregmin,
125 Opt_acregmax, Opt_acdirmin, Opt_acdirmax,
126 /* Options that take no arguments */
127 Opt_soft, Opt_hard, Opt_intr,
128 Opt_nointr, Opt_posix, Opt_noposix, Opt_cto, Opt_nocto, Opt_ac,
129 Opt_noac, Opt_lock, Opt_nolock, Opt_v2, Opt_v3, Opt_udp, Opt_tcp,
130 Opt_acl, Opt_noacl,
131 /* Error token */
132 Opt_err
133};
134
135static const match_table_t tokens __initconst = {
136 {Opt_port, "port=%u"},
137 {Opt_rsize, "rsize=%u"},
138 {Opt_wsize, "wsize=%u"},
139 {Opt_timeo, "timeo=%u"},
140 {Opt_retrans, "retrans=%u"},
141 {Opt_acregmin, "acregmin=%u"},
142 {Opt_acregmax, "acregmax=%u"},
143 {Opt_acdirmin, "acdirmin=%u"},
144 {Opt_acdirmax, "acdirmax=%u"},
145 {Opt_soft, "soft"},
146 {Opt_hard, "hard"},
147 {Opt_intr, "intr"},
148 {Opt_nointr, "nointr"},
149 {Opt_posix, "posix"},
150 {Opt_noposix, "noposix"},
151 {Opt_cto, "cto"},
152 {Opt_nocto, "nocto"},
153 {Opt_ac, "ac"},
154 {Opt_noac, "noac"},
155 {Opt_lock, "lock"},
156 {Opt_nolock, "nolock"},
157 {Opt_v2, "nfsvers=2"},
158 {Opt_v2, "v2"},
159 {Opt_v3, "nfsvers=3"},
160 {Opt_v3, "v3"},
161 {Opt_udp, "proto=udp"},
162 {Opt_udp, "udp"},
163 {Opt_tcp, "proto=tcp"},
164 {Opt_tcp, "tcp"},
165 {Opt_acl, "acl"},
166 {Opt_noacl, "noacl"},
167 {Opt_err, NULL}
168
169};
170 103
171/* 104/*
172 * Parse option string. 105 * When the "nfsrootdebug" kernel command line option is specified,
106 * enable debugging messages for NFSROOT.
173 */ 107 */
174 108static int __init nfs_root_debug(char *__unused)
175static int __init root_nfs_parse(char *name, char *buf)
176{ 109{
177 110 nfs_debug |= NFSDBG_ROOT | NFSDBG_MOUNT;
178 char *p;
179 substring_t args[MAX_OPT_ARGS];
180 int option;
181
182 if (!name)
183 return 1;
184
185 /* Set the NFS remote path */
186 p = strsep(&name, ",");
187 if (p[0] != '\0' && strcmp(p, "default") != 0)
188 strlcpy(buf, p, NFS_MAXPATHLEN);
189
190 while ((p = strsep (&name, ",")) != NULL) {
191 int token;
192 if (!*p)
193 continue;
194 token = match_token(p, tokens, args);
195
196 /* %u tokens only. Beware if you add new tokens! */
197 if (token < Opt_soft && match_int(&args[0], &option))
198 return 0;
199 switch (token) {
200 case Opt_port:
201 nfs_port = option;
202 break;
203 case Opt_rsize:
204 nfs_data.rsize = option;
205 break;
206 case Opt_wsize:
207 nfs_data.wsize = option;
208 break;
209 case Opt_timeo:
210 nfs_data.timeo = option;
211 break;
212 case Opt_retrans:
213 nfs_data.retrans = option;
214 break;
215 case Opt_acregmin:
216 nfs_data.acregmin = option;
217 break;
218 case Opt_acregmax:
219 nfs_data.acregmax = option;
220 break;
221 case Opt_acdirmin:
222 nfs_data.acdirmin = option;
223 break;
224 case Opt_acdirmax:
225 nfs_data.acdirmax = option;
226 break;
227 case Opt_soft:
228 nfs_data.flags |= NFS_MOUNT_SOFT;
229 break;
230 case Opt_hard:
231 nfs_data.flags &= ~NFS_MOUNT_SOFT;
232 break;
233 case Opt_intr:
234 case Opt_nointr:
235 break;
236 case Opt_posix:
237 nfs_data.flags |= NFS_MOUNT_POSIX;
238 break;
239 case Opt_noposix:
240 nfs_data.flags &= ~NFS_MOUNT_POSIX;
241 break;
242 case Opt_cto:
243 nfs_data.flags &= ~NFS_MOUNT_NOCTO;
244 break;
245 case Opt_nocto:
246 nfs_data.flags |= NFS_MOUNT_NOCTO;
247 break;
248 case Opt_ac:
249 nfs_data.flags &= ~NFS_MOUNT_NOAC;
250 break;
251 case Opt_noac:
252 nfs_data.flags |= NFS_MOUNT_NOAC;
253 break;
254 case Opt_lock:
255 nfs_data.flags &= ~NFS_MOUNT_NONLM;
256 break;
257 case Opt_nolock:
258 nfs_data.flags |= NFS_MOUNT_NONLM;
259 break;
260 case Opt_v2:
261 nfs_data.flags &= ~NFS_MOUNT_VER3;
262 break;
263 case Opt_v3:
264 nfs_data.flags |= NFS_MOUNT_VER3;
265 break;
266 case Opt_udp:
267 nfs_data.flags &= ~NFS_MOUNT_TCP;
268 break;
269 case Opt_tcp:
270 nfs_data.flags |= NFS_MOUNT_TCP;
271 break;
272 case Opt_acl:
273 nfs_data.flags &= ~NFS_MOUNT_NOACL;
274 break;
275 case Opt_noacl:
276 nfs_data.flags |= NFS_MOUNT_NOACL;
277 break;
278 default:
279 printk(KERN_WARNING "Root-NFS: unknown "
280 "option: %s\n", p);
281 return 0;
282 }
283 }
284
285 return 1; 111 return 1;
286} 112}
287 113
114__setup("nfsrootdebug", nfs_root_debug);
115
288/* 116/*
289 * Prepare the NFS data structure and parse all options. 117 * Parse NFS server and directory information passed on the kernel
118 * command line.
119 *
120 * nfsroot=[<server-ip>:]<root-dir>[,<nfs-options>]
121 *
122 * If there is a "%s" token in the <root-dir> string, it is replaced
123 * by the ASCII-representation of the client's IP address.
290 */ 124 */
291static int __init root_nfs_name(char *name) 125static int __init nfs_root_setup(char *line)
292{ 126{
293 static char buf[NFS_MAXPATHLEN] __initdata; 127 ROOT_DEV = Root_NFS;
294 char *cp; 128
295 129 if (line[0] == '/' || line[0] == ',' || (line[0] >= '0' && line[0] <= '9')) {
296 /* Set some default values */ 130 strlcpy(nfs_root_parms, line, sizeof(nfs_root_parms));
297 memset(&nfs_data, 0, sizeof(nfs_data)); 131 } else {
298 nfs_port = -1; 132 size_t n = strlen(line) + sizeof(NFS_ROOT) - 1;
299 nfs_data.version = NFS_MOUNT_VERSION; 133 if (n >= sizeof(nfs_root_parms))
300 nfs_data.flags = NFS_MOUNT_NONLM; /* No lockd in nfs root yet */ 134 line[sizeof(nfs_root_parms) - sizeof(NFS_ROOT) - 2] = '\0';
301 nfs_data.rsize = NFS_DEF_FILE_IO_SIZE; 135 sprintf(nfs_root_parms, NFS_ROOT, line);
302 nfs_data.wsize = NFS_DEF_FILE_IO_SIZE;
303 nfs_data.acregmin = NFS_DEF_ACREGMIN;
304 nfs_data.acregmax = NFS_DEF_ACREGMAX;
305 nfs_data.acdirmin = NFS_DEF_ACDIRMIN;
306 nfs_data.acdirmax = NFS_DEF_ACDIRMAX;
307 strcpy(buf, NFS_ROOT);
308
309 /* Process options received from the remote server */
310 root_nfs_parse(root_server_path, buf);
311
312 /* Override them by options set on kernel command-line */
313 root_nfs_parse(name, buf);
314
315 cp = utsname()->nodename;
316 if (strlen(buf) + strlen(cp) > NFS_MAXPATHLEN) {
317 printk(KERN_ERR "Root-NFS: Pathname for remote directory too long.\n");
318 return -1;
319 } 136 }
320 sprintf(nfs_export_path, buf, cp); 137
138 /*
139 * Extract the IP address of the NFS server containing our
140 * root file system, if one was specified.
141 *
142 * Note: root_nfs_parse_addr() removes the server-ip from
143 * nfs_root_parms, if it exists.
144 */
145 root_server_addr = root_nfs_parse_addr(nfs_root_parms);
321 146
322 return 1; 147 return 1;
323} 148}
324 149
150__setup("nfsroot=", nfs_root_setup);
325 151
326/* 152static int __init root_nfs_copy(char *dest, const char *src,
327 * Get NFS server address. 153 const size_t destlen)
328 */
329static int __init root_nfs_addr(void)
330{ 154{
331 if ((servaddr = root_server_addr) == htonl(INADDR_NONE)) { 155 if (strlcpy(dest, src, destlen) > destlen)
332 printk(KERN_ERR "Root-NFS: No NFS server available, giving up.\n");
333 return -1; 156 return -1;
334 } 157 return 0;
158}
335 159
336 snprintf(nfs_data.hostname, sizeof(nfs_data.hostname), 160static int __init root_nfs_cat(char *dest, const char *src,
337 "%pI4", &servaddr); 161 const size_t destlen)
162{
163 if (strlcat(dest, src, destlen) > destlen)
164 return -1;
338 return 0; 165 return 0;
339} 166}
340 167
341/* 168/*
342 * Tell the user what's going on. 169 * Parse out root export path and mount options from
170 * passed-in string @incoming.
171 *
172 * Copy the export path into @exppath.
343 */ 173 */
344#ifdef NFSROOT_DEBUG 174static int __init root_nfs_parse_options(char *incoming, char *exppath,
345static void __init root_nfs_print(void) 175 const size_t exppathlen)
346{ 176{
347 printk(KERN_NOTICE "Root-NFS: Mounting %s on server %s as root\n", 177 char *p;
348 nfs_export_path, nfs_data.hostname);
349 printk(KERN_NOTICE "Root-NFS: rsize = %d, wsize = %d, timeo = %d, retrans = %d\n",
350 nfs_data.rsize, nfs_data.wsize, nfs_data.timeo, nfs_data.retrans);
351 printk(KERN_NOTICE "Root-NFS: acreg (min,max) = (%d,%d), acdir (min,max) = (%d,%d)\n",
352 nfs_data.acregmin, nfs_data.acregmax,
353 nfs_data.acdirmin, nfs_data.acdirmax);
354 printk(KERN_NOTICE "Root-NFS: nfsd port = %d, mountd port = %d, flags = %08x\n",
355 nfs_port, mount_port, nfs_data.flags);
356}
357#endif
358
359 178
360static int __init root_nfs_init(void) 179 /*
361{ 180 * Set the NFS remote path
362#ifdef NFSROOT_DEBUG 181 */
363 nfs_debug |= NFSDBG_ROOT; 182 p = strsep(&incoming, ",");
364#endif 183 if (*p != '\0' && strcmp(p, "default") != 0)
184 if (root_nfs_copy(exppath, p, exppathlen))
185 return -1;
365 186
366 /* 187 /*
367 * Decode the root directory path name and NFS options from 188 * @incoming now points to the rest of the string; if it
368 * the kernel command line. This has to go here in order to 189 * contains something, append it to our root options buffer
369 * be able to use the client IP address for the remote root
370 * directory (necessary for pure RARP booting).
371 */ 190 */
372 if (root_nfs_name(nfs_root_name) < 0 || 191 if (incoming != NULL && *incoming != '\0')
373 root_nfs_addr() < 0) 192 if (root_nfs_cat(nfs_root_options, incoming,
374 return -1; 193 sizeof(nfs_root_options)))
194 return -1;
375 195
376#ifdef NFSROOT_DEBUG 196 /*
377 root_nfs_print(); 197 * Possibly prepare for more options to be appended
378#endif 198 */
199 if (nfs_root_options[0] != '\0' &&
200 nfs_root_options[strlen(nfs_root_options)] != ',')
201 if (root_nfs_cat(nfs_root_options, ",",
202 sizeof(nfs_root_options)))
203 return -1;
379 204
380 return 0; 205 return 0;
381} 206}
382 207
383
384/* 208/*
385 * Parse NFS server and directory information passed on the kernel 209 * Decode the export directory path name and NFS options from
386 * command line. 210 * the kernel command line. This has to be done late in order to
211 * use a dynamically acquired client IP address for the remote
212 * root directory path.
213 *
214 * Returns zero if successful; otherwise -1 is returned.
387 */ 215 */
388static int __init nfs_root_setup(char *line) 216static int __init root_nfs_data(char *cmdline)
389{ 217{
390 ROOT_DEV = Root_NFS; 218 char addr_option[sizeof("nolock,addr=") + INET_ADDRSTRLEN + 1];
391 if (line[0] == '/' || line[0] == ',' || (line[0] >= '0' && line[0] <= '9')) { 219 int len, retval = -1;
392 strlcpy(nfs_root_name, line, sizeof(nfs_root_name)); 220 char *tmp = NULL;
393 } else { 221 const size_t tmplen = sizeof(nfs_export_path);
394 int n = strlen(line) + sizeof(NFS_ROOT) - 1; 222
395 if (n >= sizeof(nfs_root_name)) 223 tmp = kzalloc(tmplen, GFP_KERNEL);
396 line[sizeof(nfs_root_name) - sizeof(NFS_ROOT) - 2] = '\0'; 224 if (tmp == NULL)
397 sprintf(nfs_root_name, NFS_ROOT, line); 225 goto out_nomem;
226 strcpy(tmp, NFS_ROOT);
227
228 if (root_server_path[0] != '\0') {
229 dprintk("Root-NFS: DHCPv4 option 17: %s\n",
230 root_server_path);
231 if (root_nfs_parse_options(root_server_path, tmp, tmplen))
232 goto out_optionstoolong;
398 } 233 }
399 root_server_addr = root_nfs_parse_addr(nfs_root_name);
400 return 1;
401}
402 234
403__setup("nfsroot=", nfs_root_setup); 235 if (cmdline[0] != '\0') {
404 236 dprintk("Root-NFS: nfsroot=%s\n", cmdline);
405/*************************************************************************** 237 if (root_nfs_parse_options(cmdline, tmp, tmplen))
406 238 goto out_optionstoolong;
407 Routines to actually mount the root directory 239 }
408 240
409 ***************************************************************************/ 241 /*
242 * Append mandatory options for nfsroot so they override
243 * what has come before
244 */
245 snprintf(addr_option, sizeof(addr_option), "nolock,addr=%pI4",
246 &servaddr);
247 if (root_nfs_cat(nfs_root_options, addr_option,
248 sizeof(nfs_root_options)))
249 goto out_optionstoolong;
410 250
411/* 251 /*
412 * Construct sockaddr_in from address and port number. 252 * Set up nfs_root_device. For NFS mounts, this looks like
413 */ 253 *
414static inline void 254 * server:/path
415set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 255 *
416{ 256 * At this point, utsname()->nodename contains our local
417 sin->sin_family = AF_INET; 257 * IP address or hostname, set by ipconfig. If "%s" exists
418 sin->sin_addr.s_addr = addr; 258 * in tmp, substitute the nodename, then shovel the whole
419 sin->sin_port = port; 259 * mess into nfs_root_device.
420} 260 */
261 len = snprintf(nfs_export_path, sizeof(nfs_export_path),
262 tmp, utsname()->nodename);
263 if (len > (int)sizeof(nfs_export_path))
264 goto out_devnametoolong;
265 len = snprintf(nfs_root_device, sizeof(nfs_root_device),
266 "%pI4:%s", &servaddr, nfs_export_path);
267 if (len > (int)sizeof(nfs_root_device))
268 goto out_devnametoolong;
421 269
422/* 270 retval = 0;
423 * Query server portmapper for the port of a daemon program.
424 */
425static int __init root_nfs_getport(int program, int version, int proto)
426{
427 struct sockaddr_in sin;
428 271
429 printk(KERN_NOTICE "Looking up port of RPC %d/%d on %pI4\n", 272out:
430 program, version, &servaddr); 273 kfree(tmp);
431 set_sockaddr(&sin, servaddr, 0); 274 return retval;
432 return rpcb_getport_sync(&sin, program, version, proto); 275out_nomem:
276 printk(KERN_ERR "Root-NFS: could not allocate memory\n");
277 goto out;
278out_optionstoolong:
279 printk(KERN_ERR "Root-NFS: mount options string too long\n");
280 goto out;
281out_devnametoolong:
282 printk(KERN_ERR "Root-NFS: root device name too long.\n");
283 goto out;
433} 284}
434 285
435 286/**
436/* 287 * nfs_root_data - Return prepared 'data' for NFSROOT mount
437 * Use portmapper to find mountd and nfsd port numbers if not overriden 288 * @root_device: OUT: address of string containing NFSROOT device
438 * by the user. Use defaults if portmapper is not available. 289 * @root_data: OUT: address of string containing NFSROOT mount options
439 * XXX: Is there any nfs server with no portmapper? 290 *
291 * Returns zero and sets @root_device and @root_data if successful,
292 * otherwise -1 is returned.
440 */ 293 */
441static int __init root_nfs_ports(void) 294int __init nfs_root_data(char **root_device, char **root_data)
442{ 295{
443 int port; 296 servaddr = root_server_addr;
444 int nfsd_ver, mountd_ver; 297 if (servaddr == htonl(INADDR_NONE)) {
445 int nfsd_port, mountd_port; 298 printk(KERN_ERR "Root-NFS: no NFS server address\n");
446 int proto; 299 return -1;
447
448 if (nfs_data.flags & NFS_MOUNT_VER3) {
449 nfsd_ver = NFS3_VERSION;
450 mountd_ver = NFS_MNT3_VERSION;
451 nfsd_port = NFS_PORT;
452 mountd_port = NFS_MNT_PORT;
453 } else {
454 nfsd_ver = NFS2_VERSION;
455 mountd_ver = NFS_MNT_VERSION;
456 nfsd_port = NFS_PORT;
457 mountd_port = NFS_MNT_PORT;
458 }
459
460 proto = (nfs_data.flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
461
462 if (nfs_port < 0) {
463 if ((port = root_nfs_getport(NFS_PROGRAM, nfsd_ver, proto)) < 0) {
464 printk(KERN_ERR "Root-NFS: Unable to get nfsd port "
465 "number from server, using default\n");
466 port = nfsd_port;
467 }
468 nfs_port = port;
469 dprintk("Root-NFS: Portmapper on server returned %d "
470 "as nfsd port\n", port);
471 } 300 }
472 301
473 if ((port = root_nfs_getport(NFS_MNT_PROGRAM, mountd_ver, proto)) < 0) { 302 if (root_nfs_data(nfs_root_parms) < 0)
474 printk(KERN_ERR "Root-NFS: Unable to get mountd port " 303 return -1;
475 "number from server, using default\n");
476 port = mountd_port;
477 }
478 mount_port = port;
479 dprintk("Root-NFS: mountd port is %d\n", port);
480 304
305 *root_device = nfs_root_device;
306 *root_data = nfs_root_options;
481 return 0; 307 return 0;
482} 308}
483
484
485/*
486 * Get a file handle from the server for the directory which is to be
487 * mounted.
488 */
489static int __init root_nfs_get_handle(void)
490{
491 struct sockaddr_in sin;
492 unsigned int auth_flav_len = 0;
493 struct nfs_mount_request request = {
494 .sap = (struct sockaddr *)&sin,
495 .salen = sizeof(sin),
496 .dirpath = nfs_export_path,
497 .version = (nfs_data.flags & NFS_MOUNT_VER3) ?
498 NFS_MNT3_VERSION : NFS_MNT_VERSION,
499 .protocol = (nfs_data.flags & NFS_MOUNT_TCP) ?
500 XPRT_TRANSPORT_TCP : XPRT_TRANSPORT_UDP,
501 .auth_flav_len = &auth_flav_len,
502 };
503 int status = -ENOMEM;
504
505 request.fh = nfs_alloc_fhandle();
506 if (!request.fh)
507 goto out;
508 set_sockaddr(&sin, servaddr, htons(mount_port));
509 status = nfs_mount(&request);
510 if (status < 0)
511 printk(KERN_ERR "Root-NFS: Server returned error %d "
512 "while mounting %s\n", status, nfs_export_path);
513 else {
514 nfs_data.root.size = request.fh->size;
515 memcpy(&nfs_data.root.data, request.fh->data, request.fh->size);
516 }
517 nfs_free_fhandle(request.fh);
518out:
519 return status;
520}
521
522/*
523 * Get the NFS port numbers and file handle, and return the prepared 'data'
524 * argument for mount() if everything went OK. Return NULL otherwise.
525 */
526void * __init nfs_root_data(void)
527{
528 if (root_nfs_init() < 0
529 || root_nfs_ports() < 0
530 || root_nfs_get_handle() < 0)
531 return NULL;
532 set_sockaddr((struct sockaddr_in *) &nfs_data.addr, servaddr, htons(nfs_port));
533 return (void*)&nfs_data;
534}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-21 09:39:39 -0500