linux-kernel - Re: [PATCH 4/4] brd: Request from fdisk 4k alignment

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Message-ID: <20140807130042.GB9401@x2.net.home>
Date:	Thu, 7 Aug 2014 15:00:42 +0200
From:	Karel Zak <kzak@...hat.com>
To:	Boaz Harrosh <openosd@...il.com>
Cc:	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Boaz Harrosh <boaz@...xistor.com>,
	Jens Axboe <axboe@...nel.dk>,
	Matthew Wilcox <willy@...ux.intel.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 4/4] brd: Request from fdisk 4k alignment

On Thu, Aug 07, 2014 at 03:17:23PM +0300, Boaz Harrosh wrote:

> > Is there an error case that this patch fixes?  I've had page alignment checks
> > in my PRD direct_access code forever, and I don't know if they've ever
> > tripped.  
> > 
> 
> Yes! as I said above fix fdisk. You never tripped on it because partitions never
> worked and you never tried them. With current code fdisk is very trigger happy

 What do you mean with fdisk? which version?

 The current fdisk (and cfdisk) follows I/O limits it has no problem
 with 4K devices. All you need is to provide all necessary information 
 by /sys (or ioctls).

> to miss-align my partitions. Depending on size maybe not the very first one but the
> consecutive ones easily.

 it would be nice to have usable bug report...

    Karel

-- 
 Karel Zak  <kzak@...hat.com>
 http://karelzak.blogspot.com
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