forked from extern/zfs-auto-snapshot
Merge branch 'topic/hanoi' of git://github.com/rdparker/zfs-auto-snapshot into hanoi
This commit is contained in:
Darik Horn
commit
e08ebdf884
@ -59,6 +59,10 @@ print_usage ()
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-n, --dry-run Print actions without actually doing anything.
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-s, --skip-scrub Do not snapshot filesystems in scrubbing pools.
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-h, --help Print this usage message.
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-H, --hanoi=INT Use the hanoi rotation scheme.
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INT how frequently the hanoi rotation is being run.
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It is a number followed by one of w, d, h, m, s for
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weeks, days, hours, minutes or seconds.
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-k, --keep=NUM Keep NUM recent snapshots and destroy older snapshots.
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-l, --label=LAB LAB is usually 'hourly', 'daily', or 'monthly'.
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-p, --prefix=PRE PRE is 'zfs-auto-snap' by default.
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@ -140,6 +144,123 @@ do_run () # [argv]
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}
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do_rotate () # flags, oldglob, target
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{
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local FLAGS="$1"
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local GLOB="$2"
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local TARGET="$3"
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local KEEP=''
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# global DESTRUCTION_COUNT
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# global WARNING_COUNT
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# global SNAPSHOTS_OLD
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# Retain at most $opt_keep number of old snapshots of this filesystem,
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# including the one that was just recently created.
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KEEP="$opt_keep"
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# ASSERT: The old snapshot list is sorted by increasing age.
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for jj in $SNAPSHOTS_OLD
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do
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# Check whether this is an old snapshot of the filesystem.
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if [ -z "${jj#$TARGET@$GLOB}" ]
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then
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KEEP=$(( $KEEP - 1 ))
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if [ "$KEEP" -le '0' ]
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then
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if do_run "zfs destroy $FLAGS '$jj'"
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then
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DESTRUCTION_COUNT=$(( $DESTRUCTION_COUNT + 1 ))
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else
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WARNING_COUNT=$(( $WARNING_COUNT + 1 ))
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fi
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fi
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fi
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done
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}
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compute_hanoi_level() # date
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{
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local DATE="$1"
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local EPOCH_TIME=''
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local HANOI_NUM=''
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local HANOI_LEVEL='1'
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# The h* is because on Solaris %H%M will have generated 12h34
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EPOCH_TIME=$(date +%s --date="$(echo $DATE | sed 's/-\(..\)h*\(..\)$/ \1:\2/')")
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HANOI_NUM=$(($EPOCH_TIME / $opt_hanoi));
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while test "$HANOI_NUM" -ne "0"
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do
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case "${HANOI_NUM}" in
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(*[13579])
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break
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;;
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esac
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HANOI_LEVEL=$(($HANOI_LEVEL + 1))
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HANOI_NUM=$(($HANOI_NUM / 2))
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done
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echo $HANOI_LEVEL
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}
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do_hanoi () # flags, oldglob, target
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{
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local FLAGS="$1"
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local GLOB="$2"
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local TARGET="$3"
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local KEEP=''
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local HANOI_LEVEL='0'
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local SNAP_DATE=''
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local SNAP_LEVEL=''
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local POSSIBLY_DESTROY=''
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# global DESTRUCTION_COUNT
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# global WARNING_COUNT
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# global SNAPSHOTS_OLD
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HANOI_LEVEL=$(compute_hanoi_level "$DATE")
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# Retain at most $opt_keep number of old snapshots of this filesystem,
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# including the one that was just recently created.
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KEEP="$opt_keep"
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# ASSERT: The old snapshot list is sorted by increasing age.
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for jj in $SNAPSHOTS_OLD
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do
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# Check whether this is an old snapshot of the filesystem.
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if [ -z "${jj#$TARGET@$GLOB}" ]
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then
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# If younger snapshot was stored for possible
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# deletion, delete it.
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if [ -n "$POSSIBLY_DESTROY" ]
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then
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if do_run "zfs destroy $FLAGS '$POSSIBLY_DESTROY'"
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then
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DESTRUCTION_COUNT=$(( $DESTRUCTION_COUNT + 1 ))
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else
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WARNING_COUNT=$(( $WARNING_COUNT + 1 ))
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fi
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POSSIBLY_DESTROY=''
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fi
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SNAP_DATE=$(echo $jj | sed 's/.*-\(....-..-..-..h*..\)$/\1/')
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SNAP_LEVEL=$(compute_hanoi_level "$SNAP_DATE")
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if test "$HANOI_LEVEL" -eq "$SNAP_LEVEL"
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then
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# By default the hanoi rotation scheme acts as
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# though there are an infinite number of
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# disks. So instead of immediately destroying
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# this snapshot, remember it as possibly
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# needing to be destroyed and only do so if an
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# older snapshot is found for this set.
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POSSIBLY_DESTROY="$jj"
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fi
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fi
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done
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}
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do_snapshots () # properties, flags, snapname, oldglob, [targets...]
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{
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local PROPS="$1"
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@ -147,12 +268,9 @@ do_snapshots () # properties, flags, snapname, oldglob, [targets...]
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local NAME="$3"
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local GLOB="$4"
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local TARGETS="$5"
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local KEEP=''
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# global DESTRUCTION_COUNT
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# global SNAPSHOT_COUNT
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# global WARNING_COUNT
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# global SNAPSHOTS_OLD
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for ii in $TARGETS
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do
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@ -164,29 +282,13 @@ do_snapshots () # properties, flags, snapname, oldglob, [targets...]
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continue
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fi
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# Retain at most $opt_keep number of old snapshots of this filesystem,
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# including the one that was just recently created.
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test -z "$opt_keep" && continue
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KEEP="$opt_keep"
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# ASSERT: The old snapshot list is sorted by increasing age.
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for jj in $SNAPSHOTS_OLD
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do
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# Check whether this is an old snapshot of the filesystem.
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if [ -z "${jj#$ii@$GLOB}" ]
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then
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KEEP=$(( $KEEP - 1 ))
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if [ "$KEEP" -le '0' ]
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then
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if do_run "zfs destroy $FLAGS '$jj'"
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then
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DESTRUCTION_COUNT=$(( $DESTRUCTION_COUNT + 1 ))
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else
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WARNING_COUNT=$(( $WARNING_COUNT + 1 ))
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fi
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fi
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fi
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done
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if test -z "$opt_hanoi"
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then
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test -z "$opt_keep" && continue
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do_rotate "$FLAGS" "$GLOB" "$ii"
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else
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do_hanoi "$FLAGS" "$GLOB" "$ii"
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fi
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done
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}
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@ -196,9 +298,9 @@ do_snapshots () # properties, flags, snapname, oldglob, [targets...]
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GETOPT=$(getopt \
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--longoptions=default-exclude,dry-run,fast,skip-scrub,recursive \
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--longoptions=event:,keep:,label:,prefix:,sep: \
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--longoptions=event:,hanoi:,keep:,label:,prefix:,sep: \
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--longoptions=debug,help,quiet,syslog,verbose \
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--options=dnshe:l:k:p:rs:qgv \
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--options=dnshH:e:l:k:p:rs:qgv \
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-- "$@" ) \
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|| exit 128
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@ -244,6 +346,29 @@ do
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print_usage
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exit 0
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;;
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(-H|--hanoi)
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HANOI_OPT="$2"
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MULT="";
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INT="";
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case "$2" in
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(*[0-9]s) MULT=1 ;;
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(*[0-9]m) MULT=60 ;;
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(*[0-9]h) MULT=3600 ;;
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(*[0-9]d) MULT=86400 ;;
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(*[0-9]w) MULT=604800 ;;
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(*)
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print_log error "Unrecognized interval $2 for the $1 parameter."
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exit 139
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;;
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esac
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INT=$(echo $2 | sed 's/.$//')
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if ! test "$INT" -gt '0' 2>/dev/null
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then
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print_log error "The $2 parameter must be a positive integer."
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fi
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opt_hanoi=$(($INT * $MULT))
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shift 2
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;;
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(-k|--keep)
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if ! test "$2" -gt '0' 2>/dev/null
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then
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@ -334,6 +459,11 @@ then
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exit 134
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fi
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if test -n "$opt_hanoi" -a -z "$opt_label"
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then
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opt_label=hanoi
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fi
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# These are the only times that `zpool status` or `zfs list` are invoked, so
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# this program for Linux has a much better runtime complexity than the similar
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# Solaris implementation.
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@ -498,14 +628,19 @@ do
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TARGETS_RECURSIVE="${TARGETS_RECURSIVE:+$TARGETS_RECURSIVE }$ii" # nb: \t
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done
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# Linux lacks SMF and the notion of an FMRI event, but always set this property
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# because the SUNW program does. The dash character is the default.
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SNAPPROP="-o com.sun:auto-snapshot-desc='$opt_event'"
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# ISO style date; fifteen characters: YYYY-MM-DD-HHMM
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# On Solaris %H%M expands to 12h34.
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DATE=$(date --utc +%F-%H%M)
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if test -n "$opt_hanoi" -a "$opt_event" = "-"
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then
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opt_event=hanoi-$HANOI_OPT-level-$(compute_hanoi_level $DATE)
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fi
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# Linux lacks SMF and the notion of an FMRI event, but always set this property
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# because the SUNW program does. The dash character is the default.
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SNAPPROP="-o com.sun:auto-snapshot-desc='$opt_event'"
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# The snapshot name after the @ symbol.
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SNAPNAME="$opt_prefix${opt_label:+$opt_sep$opt_label}-$DATE"
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