linux-kernel - Re: blk_queue_hardsect

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Date:	Fri, 6 Jun 2008 12:36:17 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Anil kumar <anils_r@...oo.com>, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: blk_queue_hardsect_size 520-byte sector

On Fri, Jun 06 2008, Alan Cox wrote:
> On Fri, 6 Jun 2008 09:54:33 +0200
> Jens Axboe <jens.axboe@...cle.com> wrote:
> 
> > On Thu, Jun 05 2008, Anil kumar wrote:
> > > Hi,
> > > 
> > > Can I call blk_queue_hardsect_size in a driver and set it to 520-byte
> > > as hardware sector size.  How does the kernel and block layers take
> > > the request, will it be in multiples of 520-bytes aligned or 512 bytes
> > > aligned?
> > 
> > No, Linux only supports power-of-2 hardware block sizes I'm afraid.
> 
> And only some of those - which is why we can't support CP/M disks and
> also early smartmedia stuff (128/256 byte/sector)

Right, should've made that clearer - Linux only really supports
power-of-2 hw block sizes, where the size is >= 512 and <=
PAGE_CACHE_SIZE.

-- 
Jens Axboe

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