#!/bin/bash -ex

VG=delta
LV=ext4test
LVSIZE=40T
MOUNTPOINT="/mnt/iso"
RESIZE2FS=/home/anssi/src/git/e2fsprogs/resize/resize2fs

INITIAL_BLOCKS=4294967295
NEW_BLOCKS=$((INITIAL_BLOCKS * 2))

lvcreate -l 100%FREE -V "$LVSIZE" -n "$LV" "$VG"
mkfs.ext4 -O meta_bg,64bit,^resize_inode "/dev/$VG/$LV" "$INITIAL_BLOCKS"

mount "/dev/$VG/$LV" "$MOUNTPOINT"

mkdir "$MOUNTPOINT/test"
for file in 1 2; do
	dd if=/dev/urandom bs=1M count=50 of="$MOUNTPOINT/test/$file"
done
md5sum $MOUNTPOINT/test/* > $MOUNTPOINT/MD5SUM

for N in $NEW_BLOCKS $((NEW_BLOCKS + 50)); do
	$RESIZE2FS "/dev/$VG/$LV" "$N"

	umount "$MOUNTPOINT"
	fsck.ext4 -ncf "/dev/$VG/$LV"
	mount "/dev/$VG/$LV" "$MOUNTPOINT"
	md5sum -c "$MOUNTPOINT/MD5SUM"
done