hammer PFSes destroy does not give back full space allocated to PFS

[Andrey N. Oktyabrski]

On 09.04.12 15:54, Siju George wrote:
> I was mirroring PFSes from 3.1 dev to slaves in 3.02 and I found that
> the PFSes took more space on the 3.02 slave.
> Investigating I found this strange thing
>
> 94 GB is allocated for this slave PFS. But when it is removed only 52
> GB is freed :-(
I think, I've seen the same issue: can't free a hammerfs filesystem. 
Disable history, prune-everything, cleanup, snaprm - nothing can help.