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dsnap-sync: btrfs send/recieve pipe update

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* always use btrfs with '-p flag' for sending incremental streams
  Andrei: https://www.spinics.net/lists/linux-btrfs/msg69369.html

Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>
This commit is contained in:
Ralf Zerres
2018-07-27 12:45:01 +02:00
parent a8b609ce94
commit 831544f86d
1 changed files with 10 additions and 16 deletions
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26
bin/dsnap-sync
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@@ -1220,14 +1220,15 @@ run_backup () {
cmd="$ssh stat --format %i $backup_root/$snapper_snapshots/$snapper_source_sync_id 2>/dev/null"
ret=$(eval $cmd)
if [ $? -eq 0 ]; then
# Sends the difference between the new snapshot and old synced snapshot to the
# backup location. Using the -c (clone-source) flag instead of -p (parent) tells it
# that there is an identical subvolume to the synced snapshot at the receiving
# location where it can get its data. This helps speed up the transfer.
cmd="btrfs send $verbose_flag -c $snapper_source_sync_snapshot $snapper_source_snapshot 2>$BTRFS_PIPE \
# Sends the difference between the new snapshot and old synced snapshot.
# Using the flag -p (parent) will require the availibility of an identical readonly
# subvolume on the source and the receiving location (the parent-id).
# using "btrfs send -p" instead of "btrfs send -c", then no parent search would be
# needed (Andreij explained in: https://www.spinics.net/lists/linux-btrfs/msg69369.html)
cmd="btrfs send $verbose_flag -p $snapper_source_sync_snapshot $snapper_source_snapshot 2>$BTRFS_PIPE \
| $cmd_pv $ssh btrfs receive $verbose_flag $snapper_target_snapshot 2>$BTRFS_PIPE"
if [ $verbose -ge 3 ]; then
printf "${GREEN}btrfs send${NO_COLOR} is using snapshot ${GREEN}'%s'${NO_COLOR} from ${GREEN}target${NO_COLOR} to sync metadata for new snapshot ${GREEN}'%s'${NO_COLOR} ...\n" \
printf "${GREEN}btrfs send${NO_COLOR} is using snapshot ${GREEN}'%s'${NO_COLOR} from ${GREEN}source${NO_COLOR} to sync metadata for new snapshot ${GREEN}'%s'${NO_COLOR} ...\n" \
"$snapper_source_sync_snapshot" "$snapper_source_snapshot"
printf "${GREEN}btrfs command:${NO_COLOR} '%s'\n" "$cmd"
fi
@@ -1237,18 +1238,11 @@ run_backup () {
die "btrfs pipe error."
fi
else
# need to use source snapshot to provide metadata for target
cmd="btrfs send $verbose_flag -p $snapper_source_sync_snapshot $snapper_source_snapshot 2>$BTRFS_PIPE \
| $cmd_pv $ssh btrfs receive $verbose_flag $snapper_target_snapshot 2>BTRFS_PIPE"
# is this clause possible?
if [ $verbose -ge 3 ]; then
printf "${GREEN}btrfs send${NO_COLOR} is using snapshot ${GREEN}'%s'${NO_COLOR} from ${GREEN}source${NO_COLOR} to sync metadata ...\n" \
printf "${RED}Error: ${NO_COLOR}No commen sync snapshot ${GREEN}'%s'${NO_COLOR} on ${GREEN}source${NO_COLOR} to sync metadata ...\n" \
"$snapper_source_sync_snapshot"
printf "${GREEN}btrfs command:${NO_COLOR} '%s'\n" "$cmd"
fi
eval $cmd 1>/dev/null
if [ "$?" -gt 0 ]; then
printf "${RED}BTRFS_PIPE: %s${NO_COLOR}\n" "$(eval cat $BTRFS_PIPE)"
die "btrfs pipe error."
die "btrfs send/recieve error."
fi
fi
fi