defrag.sh

gistfile1.txt

#! /bin/bash -e
if [ -z "$1" ]; then
  echo 'usage: [OPTIONS] <file>|<dir>'
  echo 'same as btrfs filesystem defrag (look at its --help)'
  exit
fi
if [ ! "$(id -u)" -eq 0 ]; then
  echo 'This probably needs root, if not edit' "$0"
  echo 'Remove line 10: sed -e '\''10d'\'' -i' "$0"
  exit 2
fi

path=${*:${#*}}
opts=${*:1:$((${#*} -1))}
t=$(find "${path}" -xdev -type f | wc -l)
[ $t -eq 0 ] && exit

echo Found $t files;
btrfs -v filesystem defrag $opts "${path}" 2>&1 | pv -i2 -betlap -s $t > /dev/null