linux-kernel - Re: [PATCH -mm 5/6] mm: Print first block offset for swap areas

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Message-Id: <200609262213.26274.rjw@sisk.pl>
Date:	Tue, 26 Sep 2006 22:13:25 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...l.org>
Cc:	Dave Jones <davej@...hat.com>, Pavel Machek <pavel@....cz>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mm 5/6] mm: Print first block offset for swap areas

On Tuesday, 26 September 2006 21:39, Andrew Morton wrote:
> On Sat, 23 Sep 2006 12:10:54 +0200
> "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> 
> > In order to use a swap file with swsusp we need to know the offset at which
> > its swap header is located.  However, the swap header is always located in the
> > first page block of the swap file and it's quite easy to make sys_swapon() print
> > the offset of the swap file's (or swap partition's) first page block.
> 
> Why is this needed?  The swapfile's pathname is present in /proc/swaps, so
> an application can read that, do the FIBMAP and rewrite grub.conf without
> needing to parse dmesg?

Well, this is not needed, but it's useful if you have no such application and
want to set up things manually. ;-)
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