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 "cron: $*"; "$@"; }
  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     # for comparing before and after balance.
  22     # the log is already fairly verbose, so commented.
  23     # e btrfs filesystem df $mnt
  24     # e df -H $mnt
  25     if btrfs filesystem df $mnt | grep -q "Data+Metadata"; then
  26         for usage in $dusage; do
  27             e btrfs balance start -dusage=$usage -musage=$usage $mnt
  28         done
  29     else
  30         e btrfs balance start -dusage=0 $mnt
  31         for usage in $dusage; do
  32             e btrfs balance start -dusage=$usage $mnt
  33         done
  34         e btrfs balance start -musage=0 $mnt
  35         for usage in $musage; do
  36             e btrfs balance start -musage=$usage $mnt
  37         done
  38     fi
  39     # e btrfs filesystem df $mnt
  40     # e df -H $mnt
  41     date=$(
  42         btrfs scrub status $mnt | \
  43             sed -rn 's/^\s*scrub started at (.*) and finished.*/\1/p'
  44         )
  45     if [[ $date ]]; then
  46         date=$(date --date="$date" +%s)
  47         # if date is sooner than 90 days ago
  48         # the wiki recommends 30 days or so, but
  49         # it makes the comp lag like shit for a day,
  50         # so I'm going with 90 days.
  51         if (( $date > `date +%s` - 60*60*24*30 )); then
  52             echo "cron: skiping scrub of $mnt"
  53             continue
  54         fi
  55     fi
  56     e btrfs scrub start -Bd $mnt
  57 done