btrfs maintenance shell - functions only

scrubtrfs.sh

#!/bin/bash
#
#       BTRFS maintenance
#       scrub or balance all btrfs fs present on system
#

scrub() {
        for device in $(mount -t btrfs | cut -d ' ' -f 1 |sort -u) ;do
                echo "scrub $device"
                btrfs scrub start -B -c 3 -n 9 -d $device || exit 1
        done
}

balance() {
        for fs in $(mount -t btrfs | cut -f 3 -d ' ');do
                echo "balance $fs"
                nice ionice -c 3 btrfs bal start -dusage=30 -dlimit=30 -musage=30 -mlimit=30 $fs || exit 2
        done
}