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     # 3 hours, assume a movie might run that long.
  20     idle_limit=$((1000 * 60 * 60 * 3))
  21     idle_time=$idle_limit
  22     id=999
  23     while id $((++id)) &>/dev/null; do
  24         new_idle_time=$(sudo -u \#$id xprintidle 2>/dev/null) ||:
  25         if [[ $new_idle_time && $new_idle_time -lt $idle_time ]]; then
  26             idle_time=$new_idle_time
  27         fi
  28     done
  29     if (( idle_time < idle_limit )); then
  30         idle=false
  31     else
  32         idle=true
  33     fi
  34 }
  35
  36 if [[ $1 == check ]]; then
  37     check=true
  38 else
  39     check=false
  40 fi
  41
  42 check-idle
  43
  44 fnd="findmnt --types btrfs --noheading"
  45 for x in $($fnd --output "SOURCE" --nofsroot | sort -u); do
  46     mnt=$($fnd --output "TARGET" --first-only --source $x)
  47     [[ $mnt ]] || continue
  48
  49     if ! $idle; then
  50         btrfs scrub cancel $mnt &>/dev/null ||:
  51         continue
  52     fi
  53     if $check; then
  54         continue
  55     fi
  56
  57     # for comparing before and after balance.
  58     # the log is already fairly verbose, so commented.
  59     # e btrfs filesystem df $mnt
  60     # e df -H $mnt
  61     if btrfs filesystem df $mnt | grep -q "Data+Metadata"; then
  62         for usage in $dusage; do
  63             e btrfs balance start -dusage=$usage -musage=$usage $mnt
  64         done
  65     else
  66         e btrfs balance start -dusage=0 $mnt
  67         for usage in $dusage; do
  68             e btrfs balance start -dusage=$usage $mnt
  69         done
  70         e btrfs balance start -musage=0 $mnt
  71         for usage in $musage; do
  72             e btrfs balance start -musage=$usage $mnt
  73         done
  74     fi
  75     # e btrfs filesystem df $mnt
  76     # e df -H $mnt
  77     date=$(
  78         btrfs scrub status $mnt | \
  79             sed -rn 's/^\s*scrub started at (.*) and finished.*/\1/p'
  80         )
  81     if [[ $date ]]; then
  82         date=$(date --date="$date" +%s)
  83         # if date is sooner than 90 days ago
  84         # the wiki recommends 30 days or so, but
  85         # it makes the comp lag like shit for a day,
  86         # so I'm going with 90 days.
  87         if (( date > $(date +%s) - 60*60*24*30 )); then
  88             echo "cron: skiping scrub of $mnt"
  89             continue
  90         fi
  91     fi
  92     e btrfs scrub start -Bd $mnt
  93 done