MOUNTOPTS="${3:-}"

export PATH=/sbin:/usr/sbin:$PATH

if ! which mkfs.$FSTYPE; then

echo "Cannot find mkfs.$FSTYPE"

exit 1

if [ "$FSTYPE" != "zfs" ]; then

if ! which mkfs.$FSTYPE; then

echo "Cannot find mkfs.$FSTYPE"

exit 1

fi

fi

mkdir -p /tmp /mnt/tmp

BLOCKS_KB=2

BLOCKS_MB=$((1024*2))

# Total looback dev size to allocate

TOTSZ=$((100 * $BLOCKS_MB))

TOTSZ=$((200 * $BLOCKS_MB))

# Amount of loopback device to map before bad range. Move the end of this

# around to make sure the error region doesn't make fs creation fail.

STARTSZ=$(( 58 * $BLOCKS_MB ))

dmsetup mknodes errdev1

sudo mkfs.$FSTYPE $MKFSOPTS /dev/mapper/errdev1

if [ "$FSTYPE" == "zfs" ]; then

sudo zpool create pool0 /dev/mapper/errdev1

else

sudo mkfs.$FSTYPE $MKFSOPTS /dev/mapper/errdev1

fi

# make a FS on it and mount it

mkdir -p /mnt/tmp

else

OPTSSTR="-o $MOUNTOPTS"

fi

mount /dev/mapper/errdev1 /mnt/tmp $OPTSSTR

if [ "$FSTYPE" == "zfs" ]; then

zfs set mountpoint=/mnt/tmp pool0

trap "{ trap EXIT; zpool destroy pool0; dmsetup remove errdev1; losetup -d ${LOOPDEV}; }" EXIT

else

mount /dev/mapper/errdev1 /mnt/tmp $OPTSSTR

trap "{ trap EXIT; umount /mnt/tmp; dmsetup remove errdev1; losetup -d ${LOOPDEV}; }" EXIT

fi

trap "{ trap EXIT; umount /mnt/tmp; dmsetup remove errdev1; losetup -d ${LOOPDEV}; }" EXIT

}

fs_cleanup()