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

[Andrew Morton]

On Tue, 26 Sep 2006 22:13:25 +0200
"Rafael J. Wysocki" <rjw@xxxxxxx> wrote:

> On Tuesday, 26 September 2006 21:39, Andrew Morton wrote:
> > On Sat, 23 Sep 2006 12:10:54 +0200
> > "Rafael J. Wysocki" <rjw@xxxxxxx> 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. ;-)

ick.  We need such an application (probably doable in a python script?). 
Methinks that telling people to go poking in dmesg will simply delay the
development and propagation of that application..
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