Date:   Tue, 7 Feb 2023 22:53:55 -0800
From:   Eric Biggers <ebiggers@kernel.org>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Dan Carpenter <error27@gmail.com>, linux-block@vger.kernel.org,
        Julia Lawall <julia.lawall@inria.fr>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Hongchen Zhang <zhanghongchen@loongson.cn>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Christian Brauner (Microsoft)" <brauner@kernel.org>,
        David Howells <dhowells@redhat.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Eric Dumazet <edumazet@google.com>,
        "Fabio M. De Francesco" <fmdefrancesco@gmail.com>,
        Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        maobibo <maobibo@loongson.cn>,
        Matthew Wilcox <willy@infradead.org>,
        Sedat Dilek <sedat.dilek@gmail.com>
Subject: Re: block: sleeping in atomic warnings
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On Tue, Feb 07, 2023 at 07:35:54PM +0000, Eric Biggers wrote:
> Now, it's possible that "the kernel automatically adds the key for
> test_dummy_encryption" could be implemented a bit differently.  It maybe could
> be done at the last minute, when the key is being looked for due to a user
> filesystem operation, instead of during the mount itself.  That would eliminate
> the need to call fscrypt_destroy_keyring() from __put_super(), which would avoid
> the issue being discussed here.  I'll see if there's a good way to do that.

"[PATCH 0/5] Add the test_dummy_encryption key on-demand"
(https://lore.kernel.org/linux-fscrypt/20230208062107.199831-1-ebiggers@kernel.org/T/#u)
implements this.

- Eric