Alan Altmark wrote:
> E.g. possibly just re-formatting it could cause a formatted page to be
released.  We'd need some input from Bill Holder on that.

Thanks, Alan.  Yes, CP will recognize format write CCWs and release the
corresponding vdisk backing storage.  So I think that would mean SWAPOFF,
re-format, and SWAPON.  It ought to work, no new Diag interface required.
This should be documented somewhere, but I'd have to ask the virtual I/O
folks exactly where.

- Bill

"Much that once was is lost, for none now live who remember it."  -
Galadriel
"He that breaks a thing to find out what it is has left the path of wisdom"
- Gandalf
(JRR Tolkein)

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