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Date:	Thu, 7 Aug 2014 15:00:42 +0200
From:	Karel Zak <>
To:	Boaz Harrosh <>
Cc:	Ross Zwisler <>,
	Boaz Harrosh <>,
	Jens Axboe <>,
	Matthew Wilcox <>,
	linux-kernel <>,
	linux-fsdevel <>
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 Zak  <>
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