Re: [PATCH] scsi:storvsc enable reading from VPD pages on SPC-2

From: Martin K. Petersen
Date: Thu Dec 11 2014 - 22:04:07 EST

>>>>> "Long" == Long Li <longli@xxxxxxxxxxxxx> writes:

>> Handle the issues or handle WRITE SAME(10/16)?

Long> With this patch, the SCSI layer will be able to correctly send
Long> WRITE_SAME_16 to the Hyper-V host. It will not send WRITE_SAME_10:
Long> it has been disabled in the driver template. Do you want me to
Long> send another patch with these details?

no_write_same prevents us from attempting to use WRITE SAME(10/16) to
zero block ranges.

This is completely orthogonal to using the WRITE SAME(10/16) commands
with the UNMAP bit set to discard block ranges. The latter is controlled
by the logical block provisioning heuristics and is not affected by
no_write_same at all.

Martin K. Petersen Oracle Linux Engineering
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