kernel/devfs: Pass more arguments to the callback for devfs_scan_callback.
[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 $
29 */
30
31/*
32 * Locate and mount the root filesystem.
33 *
34 * The root filesystem is detailed in the kernel environment variable
35 * vfs.root.mountfrom, which is expected to be in the general format
36 *
37 * <vfsname>:[<path>]
38 * vfsname := the name of a VFS known to the kernel and capable
39 * of being mounted as root
40 * path := disk device name or other data used by the filesystem
41 * to locate its physical store
42 *
43 */
44
45#include "opt_rootdevname.h"
46
47#include <sys/param.h>
48#include <sys/kernel.h>
49#include <sys/systm.h>
50#include <sys/proc.h>
51#include <sys/vnode.h>
52#include <sys/mount.h>
53#include <sys/malloc.h>
54#include <sys/reboot.h>
55#include <sys/diskslice.h>
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56#include <sys/conf.h>
57#include <sys/cons.h>
335dda38 58#include <sys/device.h>
cd29885a 59#include <sys/disk.h>
21739618 60#include <sys/namecache.h>
1f2de5d4 61#include <sys/paths.h>
e43a034f 62#include <sys/thread2.h>
cd29885a 63#include <sys/nlookup.h>
2c1e28dd 64#include <sys/devfs.h>
b480ee28 65#include <sys/sysctl.h>
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66
67#include "opt_ddb.h"
68#ifdef DDB
69#include <ddb/ddb.h>
70#endif
71
72MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure");
73
74#define ROOTNAME "root_device"
75
76struct vnode *rootvnode;
28623bf9 77struct nchandle rootnch;
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78
79/*
6fcb48f2 80 * The root specifiers we will try if RB_CDROM is specified. Note that
aec8eea4
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81 * with DEVFS we do not use the compatibility slice's whole-disk 'c'
82 * partition. Instead we just use the whole disk, e.g. cd0 or cd0s0.
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83 */
84static char *cdrom_rootdevnames[] = {
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85 "cd9660:cd0", /* SCSI (including AHCI and SILI) */
86 "cd9660:acd0", /* NATA */
87 "cd9660:cd1", /* SCSI (including AHCI and SILI) */
88 "cd9660:acd1", /* NATA */
89 "cd9660:cd8", /* USB */
90 "cd9660:cd9", /* USB */
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91 NULL
92};
93
cd29885a 94int vfs_mountroot_devfs(void);
984263bc 95static void vfs_mountroot(void *junk);
6b98993e 96static int vfs_mountroot_try(const char *mountfrom);
984263bc 97static int vfs_mountroot_ask(void);
cee92776 98static int getline(char *cp, int limit);
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99
100/* legacy find-root code */
101char *rootdevnames[2] = {NULL, NULL};
102static int setrootbyname(char *name);
103
104SYSINIT(mountroot, SI_SUB_MOUNT_ROOT, SI_ORDER_SECOND, vfs_mountroot, NULL);
105
106/*
107 * Find and mount the root filesystem
108 */
109static void
110vfs_mountroot(void *junk)
111{
b13267a5 112 cdev_t save_rootdev = rootdev;
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113 int i;
114 int dummy;
984263bc 115
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116 /*
117 * Make sure all disk devices created so far have also been probed,
118 * and also make sure that the newly created device nodes for
119 * probed disks are ready, too.
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120 *
121 * Messages can fly around here so get good synchronization
122 * coverage.
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123 *
124 * XXX - Delay an additional 2 seconds to help drivers which pickup
125 * devices asynchronously and are not caught by CAM's initial
126 * probe.
cd29885a 127 */
2a32d680 128 sync_devs();
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129 tsleep(&dummy, 0, "syncer", hz*2);
130
cd29885a 131
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132 /*
133 * The root filesystem information is compiled in, and we are
134 * booted with instructions to use it.
135 */
136#ifdef ROOTDEVNAME
137 if ((boothowto & RB_DFLTROOT) &&
138 !vfs_mountroot_try(ROOTDEVNAME))
139 return;
140#endif
141 /*
142 * We are booted with instructions to prompt for the root filesystem,
143 * or to use the compiled-in default when it doesn't exist.
144 */
145 if (boothowto & (RB_DFLTROOT | RB_ASKNAME)) {
146 if (!vfs_mountroot_ask())
147 return;
148 }
149
150 /*
151 * We've been given the generic "use CDROM as root" flag. This is
152 * necessary because one media may be used in many different
153 * devices, so we need to search for them.
154 */
155 if (boothowto & RB_CDROM) {
156 for (i = 0; cdrom_rootdevnames[i] != NULL; i++) {
157 if (!vfs_mountroot_try(cdrom_rootdevnames[i]))
158 return;
159 }
160 }
161
162 /*
163 * Try to use the value read by the loader from /etc/fstab, or
164 * supplied via some other means. This is the preferred
165 * mechanism.
166 */
bc01a404 167 if (!vfs_mountroot_try(kgetenv("vfs.root.mountfrom")))
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168 return;
169
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170 /*
171 * If a vfs set rootdev, try it (XXX VINUM HACK!)
172 */
028066b1 173 if (save_rootdev != NULL) {
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174 rootdev = save_rootdev;
175 if (!vfs_mountroot_try(""))
176 return;
177 }
178
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179 /*
180 * Try values that may have been computed by the machine-dependant
181 * legacy code.
182 */
6b98993e 183 if (rootdevnames[0] && !vfs_mountroot_try(rootdevnames[0]))
984263bc 184 return;
6b98993e 185 if (rootdevnames[1] && !vfs_mountroot_try(rootdevnames[1]))
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186 return;
187
188 /*
189 * If we have a compiled-in default, and haven't already tried it, try
190 * it now.
191 */
192#ifdef ROOTDEVNAME
193 if (!(boothowto & RB_DFLTROOT))
194 if (!vfs_mountroot_try(ROOTDEVNAME))
195 return;
196#endif
197
198 /*
199 * Everything so far has failed, prompt on the console if we haven't
200 * already tried that.
201 */
202 if (!(boothowto & (RB_DFLTROOT | RB_ASKNAME)) && !vfs_mountroot_ask())
203 return;
204 panic("Root mount failed, startup aborted.");
205}
206
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207
208int
209vfs_mountroot_devfs(void)
210{
211 struct vnode *vp;
212 struct nchandle nch;
213 struct nlookupdata nd;
214 struct mount *mp;
215 struct vfsconf *vfsp;
216 int error;
217 struct ucred *cred = proc0.p_ucred;
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218 const char *devfs_path, *init_chroot;
219 char *dev_malloced = NULL;
cd29885a 220
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221 if ((init_chroot = kgetenv("init_chroot")) != NULL) {
222 size_t l;
223
224 l = strlen(init_chroot) + sizeof("/dev");
225 dev_malloced = kmalloc(l, M_MOUNT, M_WAITOK);
226 ksnprintf(dev_malloced, l, "%s/dev", init_chroot);
227 devfs_path = dev_malloced;
228 } else {
229 devfs_path = "/dev";
230 }
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231 /*
232 * Lookup the requested path and extract the nch and vnode.
233 */
234 error = nlookup_init_raw(&nd,
358c69e9 235 devfs_path, UIO_SYSSPACE, NLC_FOLLOW,
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236 cred, &rootnch);
237
238 if (error == 0) {
239 devfs_debug(DEVFS_DEBUG_DEBUG, "vfs_mountroot_devfs: nlookup_init is ok...\n");
240 if ((error = nlookup(&nd)) == 0) {
241 devfs_debug(DEVFS_DEBUG_DEBUG, "vfs_mountroot_devfs: nlookup is ok...\n");
242 if (nd.nl_nch.ncp->nc_vp == NULL) {
243 devfs_debug(DEVFS_DEBUG_SHOW, "vfs_mountroot_devfs: nlookup: simply not found\n");
244 error = ENOENT;
245 }
246 }
247 }
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248 if (dev_malloced != NULL)
249 kfree(dev_malloced, M_MOUNT), dev_malloced = NULL;
250 devfs_path = NULL;
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251 if (error) {
252 nlookup_done(&nd);
253 devfs_debug(DEVFS_DEBUG_SHOW, "vfs_mountroot_devfs: nlookup failed, error: %d\n", error);
254 return (error);
255 }
256
257 /*
258 * Extract the locked+refd ncp and cleanup the nd structure
259 */
260 nch = nd.nl_nch;
261 cache_zero(&nd.nl_nch);
262 nlookup_done(&nd);
263
264 /*
265 * now we have the locked ref'd nch and unreferenced vnode.
266 */
267 vp = nch.ncp->nc_vp;
268 if ((error = vget(vp, LK_EXCLUSIVE)) != 0) {
269 cache_put(&nch);
270 devfs_debug(DEVFS_DEBUG_SHOW, "vfs_mountroot_devfs: vget failed\n");
271 return (error);
272 }
273 cache_unlock(&nch);
274
275 if ((error = vinvalbuf(vp, V_SAVE, 0, 0)) != 0) {
276 cache_drop(&nch);
277 vput(vp);
278 devfs_debug(DEVFS_DEBUG_SHOW, "vfs_mountroot_devfs: vinvalbuf failed\n");
279 return (error);
280 }
281 if (vp->v_type != VDIR) {
282 cache_drop(&nch);
283 vput(vp);
284 devfs_debug(DEVFS_DEBUG_SHOW, "vfs_mountroot_devfs: vp is not VDIR\n");
285 return (ENOTDIR);
286 }
287
288 vfsp = vfsconf_find_by_name("devfs");
2247fe02 289 vsetflags(vp, VMOUNT);
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290
291 /*
292 * Allocate and initialize the filesystem.
293 */
294 mp = kmalloc(sizeof(struct mount), M_MOUNT, M_ZERO|M_WAITOK);
aac0aabd 295 mount_init(mp);
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296 vfs_busy(mp, LK_NOWAIT);
297 mp->mnt_op = vfsp->vfc_vfsops;
298 mp->mnt_vfc = vfsp;
299 vfsp->vfc_refcount++;
300 mp->mnt_stat.f_type = vfsp->vfc_typenum;
301 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
302 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
303 mp->mnt_stat.f_owner = cred->cr_uid;
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304 vn_unlock(vp);
305
306 /*
307 * Mount the filesystem.
308 */
309 error = VFS_MOUNT(mp, "/dev", NULL, cred);
310
311 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
312
313 /*
314 * Put the new filesystem on the mount list after root. The mount
315 * point gets its own mnt_ncmountpt (unless the VFS already set one
316 * up) which represents the root of the mount. The lookup code
317 * detects the mount point going forward and checks the root of
318 * the mount going backwards.
319 *
320 * It is not necessary to invalidate or purge the vnode underneath
321 * because elements under the mount will be given their own glue
322 * namecache record.
323 */
324 if (!error) {
325 if (mp->mnt_ncmountpt.ncp == NULL) {
326 /*
327 * allocate, then unlock, but leave the ref intact
328 */
329 cache_allocroot(&mp->mnt_ncmountpt, mp, NULL);
330 cache_unlock(&mp->mnt_ncmountpt);
331 }
332 mp->mnt_ncmounton = nch; /* inherits ref */
333 nch.ncp->nc_flag |= NCF_ISMOUNTPT;
334
335 /* XXX get the root of the fs and cache_setvp(mnt_ncmountpt...) */
2247fe02 336 vclrflags(vp, VMOUNT);
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337 mountlist_insert(mp, MNTINS_LAST);
338 vn_unlock(vp);
339 //checkdirs(&mp->mnt_ncmounton, &mp->mnt_ncmountpt);
340 error = vfs_allocate_syncvnode(mp);
341 if (error) {
342 devfs_debug(DEVFS_DEBUG_SHOW, "vfs_mountroot_devfs: vfs_allocate_syncvnode failed\n");
343 }
344 vfs_unbusy(mp);
345 error = VFS_START(mp, 0);
346 vrele(vp);
347 } else {
348 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_coherency_ops);
349 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_journal_ops);
350 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_norm_ops);
351 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_spec_ops);
352 vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_fifo_ops);
2247fe02 353 vclrflags(vp, VMOUNT);
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354 mp->mnt_vfc->vfc_refcount--;
355 vfs_unbusy(mp);
356 kfree(mp, M_MOUNT);
357 cache_drop(&nch);
358 vput(vp);
359 devfs_debug(DEVFS_DEBUG_SHOW, "vfs_mountroot_devfs: mount failed\n");
360 }
361
362 devfs_debug(DEVFS_DEBUG_DEBUG, "rootmount_devfs done with error: %d\n", error);
363 return (error);
364}
365
366
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367/*
368 * Mount (mountfrom) as the root filesystem.
369 */
370static int
6b98993e 371vfs_mountroot_try(const char *mountfrom)
984263bc 372{
da4f706e 373 struct mount *mp;
6b98993e 374 char *vfsname, *devname;
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MD
375 int error;
376 char patt[32];
6b08c773
SW
377 const char *cp, *ep;
378 char *mf;
69f27b85
FT
379 struct proc *p;
380 struct vnode *vp;
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381
382 vfsname = NULL;
6b98993e 383 devname = NULL;
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384 mp = NULL;
385 error = EINVAL;
386
387 if (mountfrom == NULL)
388 return(error); /* don't complain */
389
e43a034f 390 crit_enter();
6ea70f76 391 kprintf("Mounting root from %s\n", mountfrom);
e43a034f 392 crit_exit();
984263bc 393
6b08c773 394 cp = mountfrom;
6b98993e 395 /* parse vfs name and devname */
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MD
396 vfsname = kmalloc(MFSNAMELEN, M_MOUNT, M_WAITOK);
397 devname = kmalloc(MNAMELEN, M_MOUNT, M_WAITOK);
1f1d24d2
AP
398 mf = kmalloc(MFSNAMELEN+MNAMELEN, M_MOUNT, M_WAITOK);
399 for(;;) {
400 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++);
1f1d24d2
AP
401 bzero(vfsname, MFSNAMELEN);
402 bzero(devname, MNAMELEN);
403 bzero(mf, MFSNAMELEN+MNAMELEN);
404 strncpy(mf, cp, MFSNAMELEN+MNAMELEN);
405
406 vfsname[0] = devname[0] = 0;
407 ksprintf(patt, "%%%d[a-z0-9]:%%%ds", MFSNAMELEN, MNAMELEN);
408 if (ksscanf(mf, patt, vfsname, devname) < 1)
409 goto end;
410
411 /* allocate a root mount */
412 error = vfs_rootmountalloc(vfsname,
413 devname[0] != 0 ? devname : ROOTNAME, &mp);
414 if (error != 0) {
415 kprintf("Can't allocate root mount for filesystem '%s': %d\n",
416 vfsname, error);
417 goto end;
418 }
419 mp->mnt_flag |= MNT_ROOTFS;
984263bc 420
1f1d24d2 421 /* do our best to set rootdev */
104cb849
MN
422 if ((strcmp(vfsname, "hammer") != 0) && (devname[0] != 0) &&
423 setrootbyname(devname))
1f1d24d2 424 kprintf("setrootbyname failed\n");
984263bc 425
1f1d24d2
AP
426 /* If the root device is a type "memory disk", mount RW */
427 if (rootdev != NULL && dev_is_good(rootdev) &&
428 (dev_dflags(rootdev) & D_MEMDISK)) {
429 mp->mnt_flag &= ~MNT_RDONLY;
430 }
984263bc 431
1f1d24d2 432 error = VFS_MOUNT(mp, NULL, NULL, proc0.p_ucred);
984263bc 433
1f1d24d2
AP
434 if (!error)
435 break;
436end:
437 if(*ep == 0)
438 break;
439 cp = ep + 1;
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MD
440 }
441
984263bc 442 if (vfsname != NULL)
efda3bd0 443 kfree(vfsname, M_MOUNT);
6b98993e 444 if (devname != NULL)
efda3bd0 445 kfree(devname, M_MOUNT);
1f1d24d2
AP
446 if (mf != NULL)
447 kfree(mf, M_MOUNT);
f2365172 448 if (error == 0) {
984263bc 449 /* register with list of mounted filesystems */
861905fb 450 mountlist_insert(mp, MNTINS_FIRST);
984263bc 451
8a8d5d85 452 /* sanity check system clock against root fs timestamp */
984263bc 453 inittodr(mp->mnt_time);
69f27b85
FT
454
455 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */
456 mp = mountlist_boot_getfirst();
457 if (VFS_ROOT(mp, &vp))
458 panic("cannot find root vnode");
459 if (mp->mnt_ncmountpt.ncp == NULL) {
460 cache_allocroot(&mp->mnt_ncmountpt, mp, vp);
461 cache_unlock(&mp->mnt_ncmountpt); /* leave ref intact */
462 }
463 p = curproc;
464 p->p_fd->fd_cdir = vp;
465 vref(p->p_fd->fd_cdir);
466 p->p_fd->fd_rdir = vp;
467 vref(p->p_fd->fd_rdir);
468 vfs_cache_setroot(vp, cache_hold(&mp->mnt_ncmountpt));
469 vn_unlock(vp); /* leave ref intact */
470 cache_copy(&mp->mnt_ncmountpt, &p->p_fd->fd_ncdir);
471 cache_copy(&mp->mnt_ncmountpt, &p->p_fd->fd_nrdir);
472
f9642f56 473 vfs_unbusy(mp);
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MD
474 if (mp->mnt_syncer == NULL) {
475 error = vfs_allocate_syncvnode(mp);
476 if (error)
477 kprintf("Warning: no syncer vp for root!\n");
478 error = 0;
479 }
69f27b85 480 VFS_START( mp, 0 );
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MD
481 } else {
482 if (mp != NULL) {
483 vfs_unbusy(mp);
484 kfree(mp, M_MOUNT);
485 }
486 kprintf("Root mount failed: %d\n", error);
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487 }
488 return(error);
489}
490
cd29885a 491
3a3826b3 492static void
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493vfs_mountroot_ask_callback(char *name, cdev_t dev, bool is_alias,
494 void *arg __unused)
3a3826b3 495{
b28e21ef
SW
496 if (!is_alias && dev_is_good(dev) && (dev_dflags(dev) & D_DISK))
497 kprintf(" \"%s\" ", name);
3a3826b3
AH
498}
499
cd29885a 500
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501/*
502 * Spin prompting on the console for a suitable root filesystem
503 */
504static int
505vfs_mountroot_ask(void)
506{
507 char name[128];
cee92776 508 int llimit = 100;
984263bc 509
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510 kprintf("\nManual root filesystem specification:\n");
511 kprintf(" <fstype>:<device> Specify root (e.g. ufs:da0s1a)\n");
512 kprintf(" ? List valid disk boot devices\n");
513 kprintf(" panic Just panic\n");
514 kprintf(" abort Abort manual input\n");
515 while (llimit--) {
6ea70f76 516 kprintf("\nmountroot> ");
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MD
517
518 if (getline(name, 128) < 0)
519 break;
520 if (name[0] == 0) {
521 ;
522 } else if (name[0] == '?') {
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523 kprintf("Possibly valid devices for root FS:\n");
524 //enumerate all disk devices
3a3826b3 525 devfs_scan_callback(vfs_mountroot_ask_callback, NULL);
6ea70f76 526 kprintf("\n");
984263bc 527 continue;
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MD
528 } else if (strcmp(name, "panic") == 0) {
529 panic("panic from console");
530 } else if (strcmp(name, "abort") == 0) {
531 break;
532 } else if (vfs_mountroot_try(name) == 0) {
984263bc 533 return(0);
cee92776 534 }
984263bc 535 }
cee92776 536 return(1);
0e9b9130
MD
537}
538
cd29885a 539
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540static int
541getline(char *cp, int limit)
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MD
542{
543 char *lp;
544 int c;
545
546 lp = cp;
547 for (;;) {
7f12a969
MD
548 c = cngetc();
549
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MD
550 switch (c) {
551 case -1:
cee92776 552 return(-1);
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MD
553 case '\n':
554 case '\r':
7f12a969 555 kprintf("\n");
984263bc 556 *lp++ = '\0';
cee92776 557 return(0);
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MD
558 case '\b':
559 case '\177':
560 if (lp > cp) {
7f12a969 561 kprintf("\b \b");
984263bc 562 lp--;
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MD
563 } else {
564 kprintf("%c", 7);
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MD
565 }
566 continue;
567 case '#':
7f12a969 568 kprintf("#");
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569 lp--;
570 if (lp < cp)
571 lp = cp;
572 continue;
573 case '@':
574 case 'u' & 037:
575 lp = cp;
6ea70f76 576 kprintf("%c", '\n');
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577 continue;
578 default:
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MD
579 if (lp - cp >= limit - 1) {
580 kprintf("%c", 7);
581 } else {
7f12a969 582 kprintf("%c", c);
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MD
583 *lp++ = c;
584 }
585 continue;
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MD
586 }
587 }
588}
589
590/*
b13267a5 591 * Convert a given name to the cdev_t of the disk-like device
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592 * it refers to.
593 */
b13267a5 594cdev_t
bc01a404 595kgetdiskbyname(const char *name)
e4c9c0c8 596{
b13267a5 597 cdev_t rdev;
984263bc 598
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599 /*
600 * Get the base name of the device
601 */
1f2de5d4
MD
602 if (strncmp(name, __SYS_PATH_DEV, sizeof(__SYS_PATH_DEV) - 1) == 0)
603 name += sizeof(__SYS_PATH_DEV) - 1;
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MD
604
605 /*
606 * Locate the device
607 */
a7a95662 608 rdev = devfs_find_device_by_name("%s", name);
cd29885a 609 if (rdev == NULL) {
1a8913f1 610 kprintf("no disk named '%s'\n", name);
6b98993e 611 }
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612 /*
613 * FOUND DEVICE
614 */
e4c9c0c8 615 return(rdev);
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616}
617
618/*
619 * Set rootdev to match (name), given that we expect it to
620 * refer to a disk-like device.
621 */
622static int
623setrootbyname(char *name)
624{
b13267a5 625 cdev_t diskdev;
984263bc 626
bc01a404 627 diskdev = kgetdiskbyname(name);
028066b1 628 if (diskdev != NULL) {
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629 rootdev = diskdev;
630 return (0);
631 }
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632 /* set to NULL if kgetdiskbyname() fails so that if the first rootdev is
633 * found by fails to mount and the second one isn't found, mountroot_try
634 * doesn't try again with the first one
635 */
636 rootdev = NULL;
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637 return (1);
638}
639
640#ifdef DDB
641DB_SHOW_COMMAND(disk, db_getdiskbyname)
642{
b13267a5 643 cdev_t dev;
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644
645 if (modif[0] == '\0') {
646 db_error("usage: show disk/devicename");
647 return;
648 }
bc01a404 649 dev = kgetdiskbyname(modif);
028066b1 650 if (dev != NULL)
b13267a5 651 db_printf("cdev_t = %p\n", dev);
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652 else
653 db_printf("No disk device matched.\n");
654}
655#endif
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656
657static int
658vfs_sysctl_real_root(SYSCTL_HANDLER_ARGS)
659{
660 char *real_root;
661 size_t len;
662 int error;
663
664 real_root = kgetenv("vfs.root.realroot");
665
666 if (real_root == NULL)
667 real_root = "";
668
669 len = strlen(real_root) + 1;
670
671 error = sysctl_handle_string(oidp, real_root, len, req);
672
673 return error;
674}
675
676SYSCTL_PROC(_vfs, OID_AUTO, real_root,
677 CTLTYPE_STRING | CTLFLAG_RD, 0, 0, vfs_sysctl_real_root,
678 "A", "Real root mount string");