linux-kernel - Re: [PATCH 0/3] scsi: Add Hyper-V logical block provisioning quirks

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Message-ID: <yq1a94nwo4h.fsf@sermon.lab.mkp.net>
Date:	Wed, 22 Oct 2014 21:50:22 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Sitsofe Wheeler <sitsofe@...il.com>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org,
	"James E.J. Bottomley" <JBottomley@...allels.com>
Subject: Re: [PATCH 0/3] scsi: Add Hyper-V logical block provisioning quirks

>>>>> "Sitsofe" == Sitsofe Wheeler <sitsofe@...il.com> writes:

Sitsofe> 2. On top of the above, when a disk is "small" (has less than
Sitsofe>    2^32 sectors which is typically < 2 TBytes in size) READ
Sitsofe>    CAPACITY(16) won't be triggered.

static int sd_try_rc16_first(struct scsi_device *sdp)
{
        if (sdp->host->max_cmd_len < 16)
                return 0;
        if (sdp->try_rc_10_first)
                return 0;
        if (sdp->scsi_level > SCSI_SPC_2)
                return 1;
        if (scsi_device_protection(sdp))
                return 1;
        return 0;
}

-- 
Martin K. Petersen	Oracle Linux Engineering
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