linux-ext4 - Re: [PATCH 1/1] iomap: allow NULL swap info bdev when activating swapfile

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Message-ID: <20251030150326.GA32729@lst.de>
Date: Thu, 30 Oct 2025 16:03:26 +0100
From: Christoph Hellwig <hch@....de>
To: "Darrick J. Wong" <djwong@...nel.org>
Cc: Christoph Hellwig <hch@....de>, miklos@...redi.hu, brauner@...nel.org,
	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/1] iomap: allow NULL swap info bdev when activating
 swapfile

On Thu, Oct 30, 2025 at 07:54:02AM -0700, Darrick J. Wong wrote:
> Swapfiles in general (including doing it via iomap)?  Or just the magic
> hooboo of "turn on this fugly bmapping call and bammo the kernel can
> take over your file at any time!!" ?

The latter and even more so when the mapping is farmed out to userspace.