linux-kernel - Re: How do I detect a block device is being used as swap inside its request queue handler?

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Date:	Mon, 16 Apr 2012 06:52:00 -0400
From:	Richard Yao <ryao@...stonybrook.edu>
To:	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: How do I detect a block device is being used as swap inside its
 request queue handler?

On 04/16/12 06:31, Richard Yao wrote:
> Dear Linus Torvalds et al,
> 
> I am having some trouble with an out of tree module for a virtual block
> device driver. I need to disable the direct reclaim path when the device
> is used as swap. I cannot see a way to detect that the device is being
> used as swap, so I am currently disabling it unconditionally.
> 
> Is there a clean way to detect that the block device is being used as
> swap? I am not subscribed to the list, so please CC replies to me.
> 
> Yours truly,
> Richard Yao
> 

Please disregard my previous email. I just discovered a deadlock that
can occur if this were done.

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