linux-kernel - 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 06:31:48 -0400
From:	Richard Yao <ryao@...stonybrook.edu>
To:	Kernel development list <linux-kernel@...r.kernel.org>
Subject: How do I detect a block device is being used as swap inside its request
 queue handler?

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

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