#!/bin/bash -x

set -e

here="$HOME/misc/lp1381961"
file="$here/sparse-file"
loop="/dev/loop7"
md="/dev/md7"
mnt="$here/mnt"

rm -f "$flie"
dd if=/dev/zero of="$file" bs=1k seek=1024000 count=1
losetup "$loop" "$file"
mdadm --create "$md" --auto md --level=1 --raid-devices=1 --force "$loop"
mkfs.ext4 "$md"

echo "*** before mount ..."
ls -lash "$file"

mkdir -p "$mnt"
mount "$md" "$mnt"

cp -rp /etc "$mnt"

echo "*** before trim ..."
ls -lash "$file"

fstrim -v "$mnt"

echo "*** after trim ..."
ls -lash "$file"

umount "$mnt"

echo "*** after umount ..."
ls -lash "$file"

fsck -v -f "$md"