It doesn't make sense to backup tree roots when doing fsync, since
during fsync those tree roots have not been consistent on disk.
Signed-off-by: NLiu Bo <bo.li.liu@oracle.com>
Reviewed-by: NQu Wenruo <quwenruo.btrfs@gmx.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>