mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
1a37aa566b
Use _PATH_* where where possible.
369 lines
8.4 KiB
C
369 lines
8.4 KiB
C
/*-
|
|
* Copyright (c) 1999 Michael Smith
|
|
* All rights reserved.
|
|
* Copyright (c) 1999 Poul-Henning Kamp
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Locate and mount the root filesystem.
|
|
*
|
|
* The root filesystem is detailed in the kernel environment variable
|
|
* vfs.root.mountfrom, which is expected to be in the general format
|
|
*
|
|
* <vfsname>:[<path>]
|
|
* vfsname := the name of a VFS known to the kernel and capable
|
|
* of being mounted as root
|
|
* path := disk device name or other data used by the filesystem
|
|
* to locate its physical store
|
|
*
|
|
*/
|
|
|
|
#include "opt_rootdevname.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/reboot.h>
|
|
#include <sys/diskslice.h>
|
|
#include <sys/disklabel.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/cons.h>
|
|
#include <paths.h>
|
|
|
|
#include "opt_ddb.h"
|
|
#ifdef DDB
|
|
#include <ddb/ddb.h>
|
|
#endif
|
|
|
|
MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure");
|
|
|
|
#define ROOTNAME "root_device"
|
|
|
|
struct vnode *rootvnode;
|
|
|
|
/*
|
|
* The root specifiers we will try if RB_CDROM is specified.
|
|
*/
|
|
static char *cdrom_rootdevnames[] = {
|
|
"cd9660:cd0a",
|
|
"cd9660:acd0a",
|
|
"cd9660:wcd0a",
|
|
NULL
|
|
};
|
|
|
|
static void vfs_mountroot(void *junk);
|
|
static int vfs_mountroot_try(char *mountfrom);
|
|
static int vfs_mountroot_ask(void);
|
|
static void gets(char *cp);
|
|
|
|
/* legacy find-root code */
|
|
char *rootdevnames[2] = {NULL, NULL};
|
|
static int setrootbyname(char *name);
|
|
|
|
SYSINIT(mountroot, SI_SUB_MOUNT_ROOT, SI_ORDER_SECOND, vfs_mountroot, NULL);
|
|
|
|
/*
|
|
* Find and mount the root filesystem
|
|
*/
|
|
static void
|
|
vfs_mountroot(void *junk)
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* The root filesystem information is compiled in, and we are
|
|
* booted with instructions to use it.
|
|
*/
|
|
#ifdef ROOTDEVNAME
|
|
if ((boothowto & RB_DFLTROOT) &&
|
|
!vfs_mountroot_try(ROOTDEVNAME))
|
|
return;
|
|
#endif
|
|
/*
|
|
* We are booted with instructions to prompt for the root filesystem,
|
|
* or to use the compiled-in default when it doesn't exist.
|
|
*/
|
|
if (boothowto & (RB_DFLTROOT | RB_ASKNAME)) {
|
|
if (!vfs_mountroot_ask())
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We've been given the generic "use CDROM as root" flag. This is
|
|
* necessary because one media may be used in many different
|
|
* devices, so we need to search for them.
|
|
*/
|
|
if (boothowto & RB_CDROM) {
|
|
for (i = 0; cdrom_rootdevnames[i] != NULL; i++) {
|
|
if (!vfs_mountroot_try(cdrom_rootdevnames[i]))
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Try to use the value read by the loader from /etc/fstab, or
|
|
* supplied via some other means. This is the preferred
|
|
* mechanism.
|
|
*/
|
|
if (!vfs_mountroot_try(getenv("vfs.root.mountfrom")))
|
|
return;
|
|
|
|
/*
|
|
* Try values that may have been computed by the machine-dependant
|
|
* legacy code.
|
|
*/
|
|
if (!vfs_mountroot_try(rootdevnames[0]))
|
|
return;
|
|
if (!vfs_mountroot_try(rootdevnames[1]))
|
|
return;
|
|
|
|
/*
|
|
* If we have a compiled-in default, and haven't already tried it, try
|
|
* it now.
|
|
*/
|
|
#ifdef ROOTDEVNAME
|
|
if (!(boothowto & RB_DFLTROOT))
|
|
if (!vfs_mountroot_try(ROOTDEVNAME))
|
|
return;
|
|
#endif
|
|
|
|
/*
|
|
* Everything so far has failed, prompt on the console if we haven't
|
|
* already tried that.
|
|
*/
|
|
if (!(boothowto & (RB_DFLTROOT | RB_ASKNAME)) && !vfs_mountroot_ask())
|
|
return;
|
|
panic("Root mount failed, startup aborted.");
|
|
}
|
|
|
|
/*
|
|
* Mount (mountfrom) as the root filesystem.
|
|
*/
|
|
static int
|
|
vfs_mountroot_try(char *mountfrom)
|
|
{
|
|
struct mount *mp;
|
|
char *vfsname, *path;
|
|
int error;
|
|
char patt[32];
|
|
int s;
|
|
|
|
vfsname = NULL;
|
|
path = NULL;
|
|
mp = NULL;
|
|
error = EINVAL;
|
|
|
|
if (mountfrom == NULL)
|
|
return(error); /* don't complain */
|
|
|
|
s = splcam(); /* Overkill, but annoying without it */
|
|
printf("Mounting root from %s\n", mountfrom);
|
|
splx(s);
|
|
|
|
/* parse vfs name and path */
|
|
vfsname = malloc(MFSNAMELEN, M_MOUNT, M_WAITOK);
|
|
path = malloc(MNAMELEN, M_MOUNT, M_WAITOK);
|
|
vfsname[0] = path[0] = 0;
|
|
sprintf(patt, "%%%d[a-z0-9]:%%%ds", MFSNAMELEN, MNAMELEN);
|
|
if (sscanf(mountfrom, patt, vfsname, path) < 1)
|
|
goto done;
|
|
|
|
/* allocate a root mount */
|
|
error = vfs_rootmountalloc(vfsname, path[0] != 0 ? path : ROOTNAME,
|
|
&mp);
|
|
if (error != 0) {
|
|
printf("Can't allocate root mount for filesystem '%s': %d\n",
|
|
vfsname, error);
|
|
goto done;
|
|
}
|
|
mp->mnt_flag |= MNT_ROOTFS;
|
|
|
|
/* do our best to set rootdev */
|
|
if ((path[0] != 0) && setrootbyname(path))
|
|
printf("setrootbyname failed\n");
|
|
|
|
/* If the root device is a type "memory disk", mount RW */
|
|
if (rootdev != NODEV && devsw(rootdev) &&
|
|
(devsw(rootdev)->d_flags & D_MEMDISK))
|
|
mp->mnt_flag &= ~MNT_RDONLY;
|
|
|
|
error = VFS_MOUNT(mp, NULL, NULL, NULL, curproc);
|
|
|
|
done:
|
|
if (vfsname != NULL)
|
|
free(vfsname, M_MOUNT);
|
|
if (path != NULL)
|
|
free(path, M_MOUNT);
|
|
if (error != 0) {
|
|
if (mp != NULL) {
|
|
vfs_unbusy(mp, curproc);
|
|
free(mp, M_MOUNT);
|
|
}
|
|
printf("Root mount failed: %d\n", error);
|
|
} else {
|
|
|
|
/* register with list of mounted filesystems */
|
|
mtx_enter(&mountlist_mtx, MTX_DEF);
|
|
TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list);
|
|
mtx_exit(&mountlist_mtx, MTX_DEF);
|
|
|
|
/* sanity check system clock against root filesystem timestamp */
|
|
inittodr(mp->mnt_time);
|
|
vfs_unbusy(mp, curproc);
|
|
}
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Spin prompting on the console for a suitable root filesystem
|
|
*/
|
|
static int
|
|
vfs_mountroot_ask(void)
|
|
{
|
|
char name[128];
|
|
int i;
|
|
dev_t dev;
|
|
|
|
for(;;) {
|
|
printf("\nManual root filesystem specification:\n");
|
|
printf(" <fstype>:<device> Mount <device> using filesystem <fstype>\n");
|
|
printf(" eg. ufs:%sda0s1a\n", _PATH_DEV);
|
|
printf(" ? List valid disk boot devices\n");
|
|
printf(" <empty line> Abort manual input\n");
|
|
printf("\nmountroot> ");
|
|
gets(name);
|
|
if (name[0] == 0)
|
|
return(1);
|
|
if (name[0] == '?') {
|
|
printf("Possibly valid devices for 'ufs' root:\n");
|
|
for (i = 0; i < NUMCDEVSW; i++) {
|
|
dev = makedev(i, 0);
|
|
if (devsw(dev) != NULL)
|
|
printf(" \"%s\"", devsw(dev)->d_name);
|
|
}
|
|
printf("\n");
|
|
continue;
|
|
}
|
|
if (!vfs_mountroot_try(name))
|
|
return(0);
|
|
}
|
|
}
|
|
|
|
static void
|
|
gets(char *cp)
|
|
{
|
|
char *lp;
|
|
int c;
|
|
|
|
lp = cp;
|
|
for (;;) {
|
|
printf("%c", c = cngetc() & 0177);
|
|
switch (c) {
|
|
case -1:
|
|
case '\n':
|
|
case '\r':
|
|
*lp++ = '\0';
|
|
return;
|
|
case '\b':
|
|
case '\177':
|
|
if (lp > cp) {
|
|
printf(" \b");
|
|
lp--;
|
|
}
|
|
continue;
|
|
case '#':
|
|
lp--;
|
|
if (lp < cp)
|
|
lp = cp;
|
|
continue;
|
|
case '@':
|
|
case 'u' & 037:
|
|
lp = cp;
|
|
printf("%c", '\n');
|
|
continue;
|
|
default:
|
|
*lp++ = c;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Convert a given name to the dev_t of the disk-like device
|
|
* it refers to.
|
|
*/
|
|
dev_t
|
|
getdiskbyname(char *name) {
|
|
char *cp;
|
|
dev_t dev;
|
|
|
|
cp = name;
|
|
if (!bcmp(cp, "/dev/", 5))
|
|
cp += 5;
|
|
|
|
dev = NODEV;
|
|
EVENTHANDLER_INVOKE(dev_clone, cp, strlen(cp), &dev);
|
|
return (dev);
|
|
}
|
|
|
|
/*
|
|
* Set rootdev to match (name), given that we expect it to
|
|
* refer to a disk-like device.
|
|
*/
|
|
static int
|
|
setrootbyname(char *name)
|
|
{
|
|
dev_t diskdev;
|
|
|
|
diskdev = getdiskbyname(name);
|
|
if (diskdev != NODEV) {
|
|
rootdev = diskdev;
|
|
return (0);
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
#ifdef DDB
|
|
DB_SHOW_COMMAND(disk, db_getdiskbyname)
|
|
{
|
|
dev_t dev;
|
|
|
|
if (modif[0] == '\0') {
|
|
db_error("usage: show disk/devicename");
|
|
return;
|
|
}
|
|
dev = getdiskbyname(modif);
|
|
if (dev != NODEV)
|
|
db_printf("dev_t = %p\n", dev);
|
|
else
|
|
db_printf("No disk device matched.\n");
|
|
}
|
|
#endif
|