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Currently "btrfs subvolume snapshot -i <qgroupid>" would always mark the
qgroup inconsistent.
This can be annoying if the fs has a lot of snapshots, and needs qgroup
to get the accounting for the amount of bytes it can free for each
snapshot.
Although we have the new simple quote as a solution, there is also a
case where we can skip the full scan, if all the following conditions
are met:
- The source subvolume belongs to a higher level parent qgroup
- The parent qgroup already owns all its bytes exclusively
- The new snapshot is also added to the same parent qgroup
In that case, we only need to add nodesize to the parent qgroup and
avoid a full rescan.
This patch would add the extra quick accounting update for such inherit.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
b20fe56cd2