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    SubjectRE: [PATCH 4/8] Drivers: scsi: storvsc: Filter WRITE_SAME_16
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    > -----Original Message-----
    > From: Christoph Hellwig [mailto:hch@infradead.org]
    > Sent: Wednesday, July 9, 2014 1:43 AM
    > To: KY Srinivasan
    > Cc: linux-kernel@vger.kernel.org; devel@linuxdriverproject.org;
    > ohering@suse.com; jbottomley@parallels.com; jasowang@redhat.com;
    > apw@canonical.com; linux-scsi@vger.kernel.org; stable@vger.kernel.org
    > Subject: Re: [PATCH 4/8] Drivers: scsi: storvsc: Filter WRITE_SAME_16
    >
    > On Tue, Jul 08, 2014 at 05:46:48PM -0700, K. Y. Srinivasan wrote:
    > > Host does not handle WRITE_SAME_16; filter this command out. This
    > > patch is required to handle large devices (greater than 2 TB disks).
    >
    > Storvsc already sets the no_write_same flag, where is the command coming
    > from?

    In spite of this flag, I see WRITE_SAME_16 being issued when I format a device bigger than 2 TB;
    I tried both xfs and ext4. Windows hosts currently do not handle unsupported commands correctly -
    The information returned is not sufficient to effect recovery in the Linux guest. While this may be addressed in
    future hosts, this patch fixes the problem.

    K. Y


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