[stgt] [PATCH] Add support for PREVENT/ALLOWMEDIUMREMOVAL and STARTSTOPUNIT

[ronnie sahlberg]

Tomo, List

Please find attached a patch to implement PAMR and SSU.

PAMR adds a new LUN attribute to track the removable state of a device.
A device that is "revent removal" can not be made offline by tgtadm.
In this case tgtadm will fail with a new errorcode.

Implement SSU and implement "eject" and "load".
Devices that are locked in "prevent removal" can not be "ejected" by
SSU. In this case SSU will fail with a check-condition.
If a device is "ejected" by SSU, we also automatically flag the device
as offline.


regards
ronnie sahlberg
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