linux-kernel - Re: [PATCH 5/5] brd: Add getgeo to block ops for fdisk

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Date:	Fri, 7 Nov 2014 10:23:13 +0100
From:	Karel Zak <kzak@...hat.com>
To:	Boaz Harrosh <boaz@...xistor.com>
Cc:	Jens Axboe <axboe@...com>, Matthew Wilcox <willy@...ux.intel.com>,
	Dmitry Monakhov <dmonakhov@...nvz.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 5/5] brd: Add getgeo to block ops for fdisk

On Wed, Nov 05, 2014 at 04:10:50PM +0200, Boaz Harrosh wrote:
> From: Boaz Harrosh <boaz@...xistor.com>
> 
> Now when fdisk is run on brd it will ask some cryptic
> questions about CHS. This is because the getgeo block operation
> is not implemented.

 Again, what fdisk (util-linux) version?

> I have done a quick audit of the fdisk code. The CHS calculation
> is very convoluted but at the end it comes out with a number.
> Which is taken into consideration in first-sector to allow. With
> all 1(s) this numbers is very small and other numbers come into
> account. Also note that if the device is big like 1G (not sure what
> is the threshold) fdisk will offer 1M (2048) as possible first-
> sector, and it does not matter what numbers we give here.

 oh.. sounds like archeology, CHS calculation does not mater in the
 current code, it follows I/O limits (including crazy alignment
 offset).

    Karel


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