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

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Date:	Tue, 26 Sep 2006 12:39:07 -0700
From:	Andrew Morton <akpm@...l.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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 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?
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