I think https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs-qgroup and https://btrfs.wiki.kernel.org/index.php/Quota_support are what you are looking for.
Richard Shaw <hobbes1069@xxxxxxxxx> 于 2021年1月8日周五 下午9:23写道：
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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