reserved-blocks

#!/bin/bash
SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
source "$SCRIPT_DIR/easyoptions.sh"

## Show reserved blocks
##
##  Usage: @script.name <partition>
##
##  Options:
##      --help          Show help
##      --list          Will list partitions
##      --set=<X>      Set the reserved space to X percent
##
##  Example:  @script.name /dev/nvme0n1p6 
if [[ -n $list ]]; then
    sudo fdisk -l \
        | sed -e '/Disk.*loop/,+5d'
    exit $?
fi

if [[ ${#arguments[@]} != 1 ]]; then
    $0 --help
    exit 1
fi


disk=${arguments[0]}

if [[ ! -e $disk ]]; then
    echo "No such file $disk" > /dev/stderr
    exit 1
fi

if [[ -n $set ]]; then
     sudo tune2fs -m $set $disk 
     exit $?
 fi

sudo dumpe2fs -h "$disk" 2> /dev/null | awk -F ':' '{ if($1 == "Reserved block count") { rescnt=$2 } } { if($1 == "Block count") { blkcnt=$2 } } END { print "Reserved blocks: "(rescnt/blkcnt)*100"%" }'