linux-kernel - Re: Detection of Advanced Format drives

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Message-ID: <yq1pqilbqyu.fsf@sermon.lab.mkp.net>
Date:	Tue, 27 Sep 2011 17:44:25 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Arun <engineerarun@...il.com>
Cc:	Mark Knecht <markknecht@...il.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Joshua Scoggins <theoretically.x64@...il.com>,
	Mike Snitzer <snitzer@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: Detection of Advanced Format drives

>>>>> "Arun" == Arun  <engineerarun@...il.com> writes:

Arun> A quick check of hdparm tells me that it is using the SG_IO ioctl
Arun> for the ATA_OP_PIDENTIFY command. Maybe I have some hopes of
Arun> having a correct result with the BLKPBSZGET ioctl. Will check that
Arun> out.

hdparm and the kernel are looking the same place for the physical block
size. There should be no discrepancy between what hdparm can see and
what's reported in physical_block_size by the kernel. The BLKPBSZGET
returns the same topology parameter as sysfs' physical_block_size.

-- 
Martin K. Petersen	Oracle Linux Engineering
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