Btrfs Extent Tree v2 Work Progressing For Improving The File-System's On-Disk Format

You may recall the news from a few months ago about the work to improve Btrfs' on-disk format in addressing "painful parts" of its design. That "extrent-tree-v2" work has been progressing and recently was queued up into the Btrfs for-next code albeit hidden behind a debug flag...