linux-kernel - Re: Quick question about libata and hdparm

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Message-ID: <49EBB6B4.6090507@rtr.ca>
Date:	Sun, 19 Apr 2009 19:41:40 -0400
From:	Mark Lord <lkml@....ca>
To:	Rogério Brito <rbrito@....usp.br>
Cc:	linux-kernel@...r.kernel.org, Tejun Heo <htejun@...il.com>
Subject: Re: Quick question about libata and hdparm

Rogério Brito wrote:
> On Apr 19 2009, Mark Lord wrote:
..
>> The -m flag could be done, and I even have code in hdparm to do it,
>> but libata is very buggy with multi-sector I/O, so -m is currently is
>> disallowed.
> 
> I would be interested in putting in a new drive in the NAS and testing
> your patch to debug things, if that would help with multi-sector I/O
> getting fixed with libata.
..

It just needs someone to patch libata to sniff out "SET MULTIPLE" commands
from SG_IO, and perform drive revalidation afterwards.  Very similar to
how it currently sniffs "SET FEATURES XFERMODE" commands.

If libata did that, then "hdparm -m" would become safe to use with it.

Cheers
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