openwrtv3/package/base-files/files/sbin/mount_root

#!/bin/sh
# Copyright (C) 2006 OpenWrt.org
. /etc/functions.sh

mount none /proc -t proc

size=$(awk '/MemTotal:/ {l=5242880;mt=($2*1024);print((s=mt/2)<l)?mt-l:s}' /proc/meminfo)
mount none /tmp -t tmpfs -o size=$size,nosuid,nodev,mode=1777

if grep devfs /proc/filesystems > /dev/null; then
	mount none /dev -t devfs
	M0=/dev/pty/m0
	M1=/dev/pty/m1
	HOTPLUG=/sbin/hotplug-call
else
	mount -t sysfs none /sys
	mount -t tmpfs tmpfs /dev -o size=512K
	mknod /dev/console c 5 1
	mkdir /dev/shm
	/sbin/hotplug2 --no-persistent --coldplug --set-rules-file /etc/hotplug2-init.rules
	M0=/dev/ptmx
	M1=/dev/ptmx
	HOTPLUG=
fi

mkdir -p /dev/pts /dev/shm
mount none /dev/pts -t devpts

# the shell really doesn't like having stdin/out closed
# that's why we use /dev/pty/m0 and m1 as replacement
# for /dev/console if there's no serial console available
dd if=/dev/console of=/dev/null bs=1 count=0 >/dev/null 2>/dev/null || \
	exec <$M0 >$M1 2>&0

echo "$HOTPLUG" > /proc/sys/kernel/hotplug

jffs2_ready () {
	mtdpart="$(find_mtd_part rootfs_data)"
	magic=$(hexdump $mtdpart -n 4 -e '4/1 "%02x"')
	[ "$magic" != "deadc0de" ]
}

[ failsafe != "$1" ] && {
	grep rootfs /proc/mtd >/dev/null 2>/dev/null && {
		mtd unlock rootfs
		grep rootfs_data /proc/mtd >/dev/null 2>/dev/null && {
			. /bin/firstboot
			jffs2_ready && {
				echo "switching to jffs2"
				mount "$(find_mtd_part rootfs_data)" /jffs -t jffs2
				fopivot /jffs /rom
			} || {
				echo "jffs2 not ready yet; using ramdisk"
				ramoverlay
			}
		}
	} || mount -o remount,rw /dev/root /
}