linux-kernel - Re: [dm-devel] [PATCH 1/1] dm: add message command to disallow device open

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Message-ID: <CAONX=-dCrJabyvt2S24kEJi38Pbuzj_4kvugoF_75PWV69bNJw@mail.gmail.com>
Date:   Thu, 4 Aug 2022 06:44:53 +1000
From:   Daniil Lunev <dlunev@...omium.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Zdenek Kabelac <zdenek.kabelac@...il.com>,
        Brian Geffon <bgeffon@...gle.com>,
        Mike Snitzer <snitzer@...nel.org>,
        linux-kernel@...r.kernel.org, dm-devel@...hat.com,
        Mikulas Patocka <mpatocka@...hat.com>,
        Alasdair Kergon <agk@...hat.com>
Subject: Re: [dm-devel] [PATCH 1/1] dm: add message command to disallow device open

> Have you also considered unlinking the device node (/dev/dm-$idx) from the
> filesystem after it has been set up for swap?
Yes, the node can be re-linked with mknod, thus is not a suitable solution.