On Mon, Jun 25, 2012 at 07:58:40AM -0700, Marc MERLIN wrote:

Howdy,

My btrfs pool looks like this:
usr
usr_daily_20120622_00:01:01
usr_daily_20120623_00:18:25
usr_daily_20120624_00:01:01
usr_daily_20120625_00:01:01
usr_hourly_20120625_05:00:02
usr_hourly_20120625_06:00:01
usr_hourly_20120625_07:00:01
usr_weekly_20120610_00:02:01
usr_weekly_20120617_00:02:01
usr_weekly_20120624_00:02:01

Sometimes I run low on space and I have to start dropping snapshots. I
realize that due to COW blocks, it's hard to say exactly how much space each
snapshot uses, but is there some way to get an idea how much each snapshot
will free if I delete it?

   When the relevant bit of qgroups lands, yes. Until then, not really.

   Hugo.

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