iankelling.org Git - distro-setup/blob - filesystem/etc/cron.weekly/btrfs-balance-ian

   1 #!/bin/bash
   2 set -eE -o pipefail
   3 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
   4
   5 # inspired from
   6 # https://github.com/kdave/btrfsmaintenance
   7
   8
   9 # Man page says we could also use a range, i suppose it would be
  10 # logical to use a pattern like 5..10 10..20,
  11 # but I don't know if this would help us at all.
  12 dusage="1 5 10 20 30 40 50"
  13 musage="1 5 10 20 30"
  14
  15 e() { echo "$*"; "$@"; }
  16
  17 fnd="findmnt --types btrfs --noheading"
  18 for x in $($fnd --output "SOURCE" --nofsroot | sort -u); do
  19     mnt=$($fnd --output "TARGET" --first-only --source $x)
  20     [[ $mnt ]] || continue
  21     echo "Before balance of $mnt"
  22     e btrfs filesystem df $mnt
  23     df -H $mnt
  24     if btrfs filesystem df $mnt | grep -q "Data+Metadata"; then
  25         for usage in $dusage; do
  26             e btrfs balance start -v -dusage=$usage -musage=$usage $mnt
  27         done
  28     else
  29         e btrfs balance start -dusage=0 $mnt
  30         for usage in $dusage; do
  31             e btrfs balance start -v -dusage=$usage $mnt
  32         done
  33         e btrfs balance start -musage=0 $mnt
  34         for usage in $musage; do
  35             e btrfs balance start -v -musage=$usage $mnt
  36         done
  37     fi
  38     echo "After balance of $mnt"
  39     btrfs filesystem df $mnt
  40     df -H $mnt
  41
  42     date=$(
  43         btrfs scrub status $mnt | \
  44             sed -rn 's/^\s*scrub started at (.*) and finished.*/\1/p'
  45         )
  46     if [[ $date ]]; then
  47         date=$(date --date="$date" +%s)
  48         # if date is sooner than 30 days ago
  49         if (( $date > `date +%s` - 60*60*24*30 )); then
  50             echo "skiping scrub of $mnt"
  51             continue
  52         fi
  53     fi
  54     btrfs scrub start -Bd $mnt
  55 done