filesystem_recovery.sh

#!/bin/bash
#
    if [ ! -d /var/mnt/usb1  ]; then
        echo "USB disk-on-key is not detected"
        exit 1
    fi
    service pm stop
    # Kill mdt9 garbage collection thread
    killall -9 jffs2_gcd_mtd9
    # Flush file system buffers
    sync
    # Remount USB disk
    umount /var/mnt/usb1
    mkdir -p /tmp/usb1/recoveryfs/mtdblock9
    mount -t vfat -o rw,nosuid,nodev,quiet /dev/sda1 /tmp/usb1/recoveryfs/mtdblock9
    # copy data from parttion to USB disk:
    rsync -aq /var /tmp/usb1/recoveryfs/mtdblock9/mtd9 > /tmp/usb1/recoveryfs/filesystem_recovery.log 2>&1
    # Raw copy of /dev/mtd9 content to USB:
    dd if=/dev/mtd9 of=/tmp/usb1/recoveryfs/mtdblock9/mtd9-raw
    # Erase flash partition
    flash_eraseall /dev/mtd9
    # Copy back from USB to /mtd9
    rsync -aq /tmp/usb1/recoveryfs/mtdblock9/mtd9/var/* /var/ >> /tmp/usb1/recoveryfs/filesystem_recovery.log 2>&1
    umount /tmp/usb1/recoveryfs/mtdblock9
    rm -rf /tmp/usb1
    sync
    # Restore mdt9 garbage collection thread
    mount -o rw,remount /dev/mtdblock9
    echo "Script is completed."
    echo "Check that the next files are located disk-on-key in folder recoveryfs:"
    echo "mtdblock9 - content of /var, copied from NAND to disk-on-key and back to NAND"
    echo "mtd9 - raw copy of /dev/mtd9 - to be used for problem analyzing"
    echo "filesystem_recovery.log - rsync log"
    echo "system should now be rebooted and remanufacture might be in order"