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

[Long Li]

Thanks Martin for the explanation.

I'll send out another patch.

> -----Original Message-----
> From: Martin K. Petersen [mailto:martin.petersen@xxxxxxxxxx]
> Sent: Thursday, December 11, 2014 7:04 PM
> To: Long Li
> Cc: Martin K. Petersen; KY Srinivasan; Haiyang Zhang;
> JBottomley@xxxxxxxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx;
> devel@xxxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH] scsi:storvsc enable reading from VPD pages on SPC-2
> 
> >>>>> "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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