How to force fsck at boot?

Installing and Using OpenWrt
14

add fsck in /lib/preinit/80_mount_init to check the disk every time it boots
the modified file looks like

#!/bin/sh
# Copyright (C) 2006 OpenWrt.org
# Copyright (C) 2010 Vertical Communications

do_mount_root() {
#code for checking disks
        if [ -x '/usr/sbin/fsck.ext4' ]; then
                if [ -e '/dev/sda1' ]; then
                        echo "Checking disk /dev/sda1...."
                        /usr/sbin/fsck.ext4 -y /dev/sda1
                fi
                if [ -e '/dev/sda2' ]; then
                        echo "Checking disk /dev/sds2..."
                        /usr/sbin/fsck.ext4 -y /dev/sda2
                fi
        fi

        mount_root
        boot_run_hook preinit_mount_root
        [ -f /sysupgrade.tgz ] && {
                echo "- config restore -"
                cd /
                tar xzf /sysupgrade.tgz
        }
}

[ "$INITRAMFS" = "1" ] || boot_hook_add preinit_main do_mount_root
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