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    SubjectRE: [PATCH 1/1] Drivers: scsi: storvsc: Add blist flags
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    > -----Original Message-----
    > From: Sitsofe Wheeler [mailto:sitsofe@gmail.com]
    > Sent: Wednesday, July 23, 2014 3:05 AM
    > To: KY Srinivasan
    > Cc: gregkh@linuxfoundation.org; linux-kernel@vger.kernel.org;
    > devel@linuxdriverproject.org; ohering@suse.com; apw@canonical.com;
    > jasowang@redhat.com; jbottomley@parallels.com; hch@infradead.org;
    > linux-scsi@vger.kernel.org
    > Subject: Re: [PATCH 1/1] Drivers: scsi: storvsc: Add blist flags
    >
    > On Mon, Jul 21, 2014 at 04:06:01PM -0700, K. Y. Srinivasan wrote:
    > > Add blist flags to permit the reading of the VPD pages even when the
    > > target may claim SPC-2 compliance. MSFT targets currently claim SPC-2
    > > compliance while they implement post SPC-2 features.
    > > With this patch we can correctly handle WRITE_SAME_16 issues.
    >
    > OK I've just seen this as I was about to post a similar patch to get discard
    > going on Hyper-V. Will your patches handle Hyper-V pass through devices
    > that support discard? The SSD I have here reports the following in the Linux

    It should. Hyper-V does support pass through devices.

    K. Y
    > VM:
    >
    > # sg_vpd -p lbpv /dev/sdc
    > Logical block provisioning VPD page (SBC):
    > Unmap command supported (LBPU): 1
    > Write same (16) with unmap bit supported (LBWS): 0
    > Write same (10) with unmap bit supported (LBWS10): 0
    > Logical block provisioning read zeros (LBPRZ): 0
    > Anchored LBAs supported (ANC_SUP): 1
    > Threshold exponent: 0
    > Descriptor present (DP): 0
    > Provisioning type: 0
    >
    > # sg_readcap -l /dev/sdc
    > Read Capacity results:
    > Protection: prot_en=0, p_type=0, p_i_exponent=0
    > Logical block provisioning: lbpme=0, lbprz=0
    > Last logical block address=234441647 (0xdf94baf), Number of logical
    > blocks=234441648
    > Logical block length=512 bytes
    > Logical blocks per physical block exponent=0
    > Lowest aligned logical block address=0
    > Hence:
    > Device size: 120034123776 bytes, 114473.5 MiB, 120.03 GB
    >
    > --
    > Sitsofe | http://sucs.org/~sits/


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