xfs_defrag.sh

#!/bin/bash

# This script is just meant to defrag all my XFS drives (except the root
# partition).

set -eo pipefail

if [[ $EUID -ne 0 ]]; then
    printf '\n%s\n\n' 'You need to be root to run this script!'
    exit
fi

date=$(date "+%F")

passes='60'

xfs_log="${HOME}/xfs_defrag_log-${date}_${RANDOM}.txt"

mapfile -t lines < <(mount -t xfs)

xfs_defrag () {
    declare -a partitions

    for (( i = 0; i < ${#lines[@]}; i++ )); do
        line="${lines[${i}]}"

        mapfile -d' ' -t line_parts <<<"$line"
        line_parts[-1]="${line_parts[-1]%$'\n'}"

        if [[ ${line_parts[2]} == '/' ]]; then
            continue
        fi

        if [[ -b ${line_parts[0]} ]]; then
            partitions+=("${line_parts[0]}")
        fi
    done

    for (( i = 0; i < ${#partitions[@]}; i++ )); do
        partition="${partitions[${i}]}"

        printf '\n%s\n\n' "*** ${partition}"

        xfs_fsr -v -p "$passes" "$partition"
    done

    for (( i = 0; i < ${#partitions[@]}; i++ )); do
        partition="${partitions[${i}]}"

        printf '\n%s\n\n' "*** ${partition}"

        xfs_db -c frag -r "$partition"
    done
}

xfs_defrag | tee "$xfs_log"