I think this is one of the corner cases for BTRFS as most people want the opposite behavior, but on one computer I run MythTV and it manages how many recordings to keep based on the available free space. Once free space comes down to a certain threshold it starts expiring older recordings.
Obviously this runs counter to btrfs's subvolume method of sharing free space.
So is there a way to set the "maximum" size of a subvolume? Google has failed me on this one.
Thanks,
Richard
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