iankelling.org Git - distro-setup/blob - btrfsmaint

   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 check-idle() {
  18     export DISPLAY=:0
  19     idle_time=$(xprintidle 2>/dev/null) ||:
  20     # 3 hours, assume a movie might run that long.
  21     if [[ $idle_time ]] && (( idle_time < 1000 * 60 * 60 * 3 )); then
  22         idle=false
  23     else
  24         idle=true
  25     fi
  26 }
  27
  28 if [[ $1 == check ]]; then
  29     check=true
  30 else
  31     check=false
  32 fi
  33
  34 check-idle
  35
  36 fnd="findmnt --types btrfs --noheading"
  37 for x in $($fnd --output "SOURCE" --nofsroot | sort -u); do
  38     mnt=$($fnd --output "TARGET" --first-only --source $x)
  39     [[ $mnt ]] || continue
  40
  41     if ! $idle; then
  42         btrfs scrub cancel $mnt &>/dev/null ||:
  43         continue
  44     fi
  45     if $check; then
  46         continue
  47     fi
  48
  49     # for comparing before and after balance.
  50     # the log is already fairly verbose, so commented.
  51     # e btrfs filesystem df $mnt
  52     # e df -H $mnt
  53     if btrfs filesystem df $mnt | grep -q "Data+Metadata"; then
  54         for usage in $dusage; do
  55             e btrfs balance start -dusage=$usage -musage=$usage $mnt
  56         done
  57     else
  58         e btrfs balance start -dusage=0 $mnt
  59         for usage in $dusage; do
  60             e btrfs balance start -dusage=$usage $mnt
  61         done
  62         e btrfs balance start -musage=0 $mnt
  63         for usage in $musage; do
  64             e btrfs balance start -musage=$usage $mnt
  65         done
  66     fi
  67     # e btrfs filesystem df $mnt
  68     # e df -H $mnt
  69     date=$(
  70         btrfs scrub status $mnt | \
  71             sed -rn 's/^\s*scrub started at (.*) and finished.*/\1/p'
  72         )
  73     if [[ $date ]]; then
  74         date=$(date --date="$date" +%s)
  75         # if date is sooner than 90 days ago
  76         # the wiki recommends 30 days or so, but
  77         # it makes the comp lag like shit for a day,
  78         # so I'm going with 90 days.
  79         if (( $date > `date +%s` - 60*60*24*30 )); then
  80             echo "cron: skiping scrub of $mnt"
  81             continue
  82         fi
  83     fi
  84     e btrfs scrub start -Bd $mnt
  85 done