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For details see https://fate.suse.com/318144

First check if the Feature status is "done".

I propose that I improve the implementation of btrfs quota groups beyond what we had for SLES-12 GA. The benefits to this work would be that snapper and our end users would get improved accounting of space usage on btrfs. In addition I list a few items which are intended to generally improve the quality of btrfs quota groups.

Specifically:

Kernel Tasks:

• Implement hierarchical quota groups. This way snapper could create parent groups which account properly for the groups below them. This may have a performance impact on quota rescan though.

• Delete qgroup items on subvolume deletion (I wanted this for us earlier but it turned out to be more complicated than initially thought)

Btrfsprogs:

• Accounting of heirarchical groups in btrfsck (right now btrfsck only cares about level 0 groups)

• btrfsck to write out fixed qgroup items. This prevents user from having to do a rescan on unclean shutdown.