Simplify vn_lock(), VOP_LOCK(), and VOP_UNLOCK() by removing the thread_t
[dragonfly.git] / sys / kern / vfs_conf.c
CommitLineData
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1/*-
2 * Copyright (c) 1999 Michael Smith
3 * All rights reserved.
4 * Copyright (c) 1999 Poul-Henning Kamp
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: src/sys/kern/vfs_conf.c,v 1.49.2.5 2003/01/07 11:56:53 joerg Exp $
e43a034f 29 * $DragonFly: src/sys/kern/vfs_conf.c,v 1.14 2005/06/06 15:02:28 dillon Exp $
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30 */
31
32/*
33 * Locate and mount the root filesystem.
34 *
35 * The root filesystem is detailed in the kernel environment variable
36 * vfs.root.mountfrom, which is expected to be in the general format
37 *
38 * <vfsname>:[<path>]
39 * vfsname := the name of a VFS known to the kernel and capable
40 * of being mounted as root
41 * path := disk device name or other data used by the filesystem
42 * to locate its physical store
43 *
44 */
45
46#include "opt_rootdevname.h"
47
48#include <sys/param.h>
49#include <sys/kernel.h>
50#include <sys/systm.h>
51#include <sys/proc.h>
52#include <sys/vnode.h>
53#include <sys/mount.h>
54#include <sys/malloc.h>
55#include <sys/reboot.h>
56#include <sys/diskslice.h>
57#include <sys/disklabel.h>
58#include <sys/conf.h>
59#include <sys/cons.h>
335dda38 60#include <sys/device.h>
21739618 61#include <sys/namecache.h>
1f2de5d4 62#include <sys/paths.h>
e43a034f 63#include <sys/thread2.h>
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64
65#include "opt_ddb.h"
66#ifdef DDB
67#include <ddb/ddb.h>
68#endif
69
70MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure");
71
72#define ROOTNAME "root_device"
73
74struct vnode *rootvnode;
21739618 75struct namecache *rootncp;
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76
77/*
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78 * The root specifiers we will try if RB_CDROM is specified. Note that
79 * the ATA driver will accept acd*a and acd*c, but the SCSI driver
80 * will only accept cd*c, so use 'c'.
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81 */
82static char *cdrom_rootdevnames[] = {
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83 "cd9660:cd0c",
84 "cd9660:acd0c",
85 "cd9660:cd1c",
86 "cd9660:acd1c",
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87 NULL
88};
89
90static void vfs_mountroot(void *junk);
6b98993e 91static int vfs_mountroot_try(const char *mountfrom);
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92static int vfs_mountroot_ask(void);
93static void gets(char *cp);
94
95/* legacy find-root code */
96char *rootdevnames[2] = {NULL, NULL};
97static int setrootbyname(char *name);
98
99SYSINIT(mountroot, SI_SUB_MOUNT_ROOT, SI_ORDER_SECOND, vfs_mountroot, NULL);
100
101/*
102 * Find and mount the root filesystem
103 */
104static void
105vfs_mountroot(void *junk)
106{
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107 int i;
108 dev_t save_rootdev = rootdev;
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109
110 /*
111 * The root filesystem information is compiled in, and we are
112 * booted with instructions to use it.
113 */
114#ifdef ROOTDEVNAME
115 if ((boothowto & RB_DFLTROOT) &&
116 !vfs_mountroot_try(ROOTDEVNAME))
117 return;
118#endif
119 /*
120 * We are booted with instructions to prompt for the root filesystem,
121 * or to use the compiled-in default when it doesn't exist.
122 */
123 if (boothowto & (RB_DFLTROOT | RB_ASKNAME)) {
124 if (!vfs_mountroot_ask())
125 return;
126 }
127
128 /*
129 * We've been given the generic "use CDROM as root" flag. This is
130 * necessary because one media may be used in many different
131 * devices, so we need to search for them.
132 */
133 if (boothowto & RB_CDROM) {
134 for (i = 0; cdrom_rootdevnames[i] != NULL; i++) {
135 if (!vfs_mountroot_try(cdrom_rootdevnames[i]))
136 return;
137 }
138 }
139
140 /*
141 * Try to use the value read by the loader from /etc/fstab, or
142 * supplied via some other means. This is the preferred
143 * mechanism.
144 */
145 if (!vfs_mountroot_try(getenv("vfs.root.mountfrom")))
146 return;
147
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148 /*
149 * If a vfs set rootdev, try it (XXX VINUM HACK!)
150 */
151 if (save_rootdev != NODEV) {
152 rootdev = save_rootdev;
153 if (!vfs_mountroot_try(""))
154 return;
155 }
156
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157 /*
158 * Try values that may have been computed by the machine-dependant
159 * legacy code.
160 */
6b98993e 161 if (rootdevnames[0] && !vfs_mountroot_try(rootdevnames[0]))
984263bc 162 return;
6b98993e 163 if (rootdevnames[1] && !vfs_mountroot_try(rootdevnames[1]))
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164 return;
165
166 /*
167 * If we have a compiled-in default, and haven't already tried it, try
168 * it now.
169 */
170#ifdef ROOTDEVNAME
171 if (!(boothowto & RB_DFLTROOT))
172 if (!vfs_mountroot_try(ROOTDEVNAME))
173 return;
174#endif
175
176 /*
177 * Everything so far has failed, prompt on the console if we haven't
178 * already tried that.
179 */
180 if (!(boothowto & (RB_DFLTROOT | RB_ASKNAME)) && !vfs_mountroot_ask())
181 return;
182 panic("Root mount failed, startup aborted.");
183}
184
185/*
186 * Mount (mountfrom) as the root filesystem.
187 */
188static int
6b98993e 189vfs_mountroot_try(const char *mountfrom)
984263bc 190{
dadab5e9 191 struct thread *td = curthread;
984263bc 192 struct mount *mp;
6b98993e 193 char *vfsname, *devname;
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194 int error;
195 char patt[32];
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196
197 vfsname = NULL;
6b98993e 198 devname = NULL;
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199 mp = NULL;
200 error = EINVAL;
201
202 if (mountfrom == NULL)
203 return(error); /* don't complain */
204
e43a034f 205 crit_enter();
984263bc 206 printf("Mounting root from %s\n", mountfrom);
e43a034f 207 crit_exit();
984263bc 208
6b98993e 209 /* parse vfs name and devname */
984263bc 210 vfsname = malloc(MFSNAMELEN, M_MOUNT, M_WAITOK);
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211 devname = malloc(MNAMELEN, M_MOUNT, M_WAITOK);
212 vfsname[0] = devname[0] = 0;
984263bc 213 sprintf(patt, "%%%d[a-z0-9]:%%%ds", MFSNAMELEN, MNAMELEN);
6b98993e 214 if (sscanf(mountfrom, patt, vfsname, devname) < 1)
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215 goto done;
216
217 /* allocate a root mount */
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218 error = vfs_rootmountalloc(vfsname,
219 devname[0] != 0 ? devname : ROOTNAME, &mp);
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220 if (error != 0) {
221 printf("Can't allocate root mount for filesystem '%s': %d\n",
222 vfsname, error);
223 goto done;
224 }
225 mp->mnt_flag |= MNT_ROOTFS;
226
227 /* do our best to set rootdev */
6b98993e 228 if ((devname[0] != 0) && setrootbyname(devname))
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229 printf("setrootbyname failed\n");
230
231 /* If the root device is a type "memory disk", mount RW */
e4c9c0c8 232 if (rootdev != NODEV && dev_is_good(rootdev) &&
335dda38 233 (dev_dflags(rootdev) & D_MEMDISK)) {
984263bc 234 mp->mnt_flag &= ~MNT_RDONLY;
335dda38 235 }
984263bc 236
21739618 237 error = VFS_MOUNT(mp, NULL, NULL, td);
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238
239done:
240 if (vfsname != NULL)
241 free(vfsname, M_MOUNT);
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242 if (devname != NULL)
243 free(devname, M_MOUNT);
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244 if (error != 0) {
245 if (mp != NULL) {
dadab5e9 246 vfs_unbusy(mp, td);
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247 free(mp, M_MOUNT);
248 }
249 printf("Root mount failed: %d\n", error);
250 } else {
984263bc 251 /* register with list of mounted filesystems */
861905fb 252 mountlist_insert(mp, MNTINS_FIRST);
984263bc 253
8a8d5d85 254 /* sanity check system clock against root fs timestamp */
984263bc 255 inittodr(mp->mnt_time);
dadab5e9 256 vfs_unbusy(mp, td);
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257 }
258 return(error);
259}
260
261/*
262 * Spin prompting on the console for a suitable root filesystem
263 */
264static int
265vfs_mountroot_ask(void)
266{
267 char name[128];
268 int i;
269 dev_t dev;
270
271 for(;;) {
272 printf("\nManual root filesystem specification:\n");
273 printf(" <fstype>:<device> Mount <device> using filesystem <fstype>\n");
6b98993e 274 printf(" eg. ufs:da0s1a\n");
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275 printf(" ? List valid disk boot devices\n");
276 printf(" <empty line> Abort manual input\n");
277 printf("\nmountroot> ");
278 gets(name);
279 if (name[0] == 0)
280 return(1);
281 if (name[0] == '?') {
282 printf("Possibly valid devices for 'ufs' root:\n");
283 for (i = 0; i < NUMCDEVSW; i++) {
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284 dev = udev2dev(makeudev(i, 0), 0);
285 if (dev_is_good(dev))
335dda38 286 printf(" \"%s\"", dev_dname(dev));
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287 }
288 printf("\n");
289 continue;
290 }
291 if (!vfs_mountroot_try(name))
292 return(0);
293 }
294}
295
296static void
297gets(char *cp)
298{
299 char *lp;
300 int c;
301
302 lp = cp;
303 for (;;) {
304 printf("%c", c = cngetc() & 0177);
305 switch (c) {
306 case -1:
307 case '\n':
308 case '\r':
309 *lp++ = '\0';
310 return;
311 case '\b':
312 case '\177':
313 if (lp > cp) {
314 printf(" \b");
315 lp--;
316 }
317 continue;
318 case '#':
319 lp--;
320 if (lp < cp)
321 lp = cp;
322 continue;
323 case '@':
324 case 'u' & 037:
325 lp = cp;
326 printf("%c", '\n');
327 continue;
328 default:
329 *lp++ = c;
330 }
331 }
332}
333
334/*
335 * Convert a given name to the dev_t of the disk-like device
336 * it refers to.
337 */
338dev_t
6b98993e 339getdiskbyname(const char *name)
e4c9c0c8 340{
984263bc 341 char *cp;
6b98993e 342 int nlen;
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343 int cd, unit, slice, part;
344 dev_t dev;
e4c9c0c8 345 dev_t rdev;
984263bc 346
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347 /*
348 * Get the base name of the device
349 */
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350 if (strncmp(name, __SYS_PATH_DEV, sizeof(__SYS_PATH_DEV) - 1) == 0)
351 name += sizeof(__SYS_PATH_DEV) - 1;
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352 cp = __DECONST(char *, name);
353 while (*cp == '/')
354 ++cp;
355 while (*cp >= 'a' && *cp <= 'z')
356 ++cp;
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357 if (cp == name) {
358 printf("missing device name\n");
359 return (NODEV);
360 }
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361 nlen = cp - name;
362
363 /*
364 * Get the unit.
365 */
366 unit = strtol(cp, &cp, 10);
367 if (name + nlen == (const char *)cp || unit < 0 || unit > DKMAXUNIT) {
368 printf("bad unit: %d\n", unit);
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369 return (NODEV);
370 }
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371
372 /*
373 * Get the slice. Note that if no partition or partition 'a' is
374 * specified, and no slice is specified, we will try both 'ad0a'
375 * (which is what you get when slice is 0), and also 'ad0' (the
376 * whole-disk partition, slice == 1).
377 */
378 if (*cp == 's') {
379 slice = cp[1] - '0';
380 if (slice < 1 || slice > 9) {
381 printf("bad slice number\n");
382 return(NODEV);
383 }
384 ++slice; /* slice #1 starts at 2 */
984263bc 385 cp += 2;
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386 } else {
387 slice = 0;
984263bc 388 }
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389
390 /*
391 * Get the partition.
392 */
393 if (*cp >= 'a' && *cp <= 'p') {
984263bc 394 part = *cp - 'a';
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395 ++cp;
396 } else {
397 part = 0;
984263bc 398 }
6b98993e 399
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400 if (*cp != '\0') {
401 printf("junk after name\n");
402 return (NODEV);
403 }
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404
405 /*
406 * Locate the device
407 */
408 for (cd = 0; cd < NUMCDEVSW; cd++) {
409 const char *dname;
410
411 dev = udev2dev(makeudev(cd, dkmakeminor(unit, slice, part)), 0);
412 if (dev_is_good(dev) && (dname = dev_dname(dev)) != NULL) {
413 if (strlen(dname) == nlen &&
414 strncmp(dname, name, nlen) == 0) {
415 break;
416 }
417 }
418 }
419 if (cd == NUMCDEVSW) {
420 printf("no such device '%*.*s'\n", nlen, nlen, name);
421 return (NODEV);
422 }
423
424 /*
425 * FOUND DEVICE
426 */
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427 rdev = make_sub_dev(dev, dkmakeminor(unit, slice, part));
428 return(rdev);
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429}
430
431/*
432 * Set rootdev to match (name), given that we expect it to
433 * refer to a disk-like device.
434 */
435static int
436setrootbyname(char *name)
437{
438 dev_t diskdev;
439
440 diskdev = getdiskbyname(name);
441 if (diskdev != NODEV) {
442 rootdev = diskdev;
443 return (0);
444 }
445
446 return (1);
447}
448
449#ifdef DDB
450DB_SHOW_COMMAND(disk, db_getdiskbyname)
451{
452 dev_t dev;
453
454 if (modif[0] == '\0') {
455 db_error("usage: show disk/devicename");
456 return;
457 }
458 dev = getdiskbyname(modif);
459 if (dev != NODEV)
460 db_printf("dev_t = %p\n", dev);
461 else
462 db_printf("No disk device matched.\n");
463}
464#endif