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Date: Mon, 26 Jan 2004 03:57:58 -0800
From: Andrew Morton <akpm@osdl.org>
To: Bart Samwel <bart@samwel.tk>
Cc: felix-kernel@fefe.de, linux-kernel@vger.kernel.org
Subject: Re: Request: I/O request recording
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Bart Samwel <bart@samwel.tk> wrote:
>
> 2. Swapfiles apparently don't like to be touched. I did an 
>  ioctl(FIGETBSZ) on a swapfile, and it would simply block until I did a 
>  swapoff on the file. I didn't even get to the FIBMAP part. :( Is this 
>  correct behaviour?

yup.

> And is there any way to detect this so that I can work around it?

swapoff -a beforehand, I guess.