defrag

#! /bin/bash
#----------------------------------------------------------------------
# Description: fast defrag files in the specified directory for ext4
# Author: Artem S. Tashkinov
# Created at: Fri Jun 10 10:11:00 2022
#             2023-04-22 13:45:01 egrep: warning: egrep is obsolescent; using grep -E
# System: Linux 5.18.3-az3 on x86_64
#
# Copyright (c) 2022 Artem S. Tashkinov  All rights reserved.
#
#----------------------------------------------------------------------

# Initially used this but it takes forever to complete:
#
# find .  -xdev -type f | while read filename; do filefrag "$filename" | egrep -v ": 1 extent|: 0 extents"; done | while read line; do fname=`echo "$line" | awk -F ': ' '{print $1}'`; e4defrag -v "$fname" | grep -v "e4defrag 1"; done
#
# -P $(nproc) below could be too much or too little for your system - adjust accordingly

isfragged()
{
    for i in "$@"; do
        filefrag "$i" | grep -E -v ": 1 extent|: 0 extents"
    done
}

if [ "$1" = "isfragged" ]; then
    shift
    isfragged "$@"
    exit 0
fi

test "$UID" -ne "0" && echo "Must be run under root" && exit 0

test ! -d "$1" && echo "Need a valid directory to continue" && exit 1
cd "$1" || exit 2
echo "Defragging [$1] ..."
find .  -xdev -type f -print0 | xargs -r -0 -P $(nproc) defrag isfragged | while read line; do fname=`echo "$line" | awk -F ': ' '{print $1}'`; e4defrag -v "$fname" | grep -v "e4defrag 1"; done