[stgt] [PATCH 2/2] Add SBC UNMAP command and thin provisioning to tgtd

[ronnie sahlberg]

Tomo,

Please find attached a patch to TGTD that adds emulation of SBC UNMAP command.

The unmap command is implemented so that when the LUN attribute
"--params thin_provisioning=1" is set
it will try to release the affected region of the LUN image by calling
fallocate(... FALLOC_FL_PUNCH_HOLE ...) to release the blocks back to
the underlying filesystem.
This only works for some filesystems under linux at this point.


READ_CAPACITY16 is updated to set LPBME and LBPRZ for thin-provisioned LUNs.


VPD page b2 is added which reports the support for provisioning.
When the thin_provisioning attribute is updated we update the VPD page
accordingly too.


regards
ronnie sahlberg
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