linux-kernel - Re: [PATCH] gfs2: Fix mmap + page fault deadlocks

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Message-ID: <CAHk-=whHTB6dOrz3AkPVL7h5t8k0Ety1dy1r+BEy3+xptzF3bQ@mail.gmail.com>
Date:   Thu, 1 Jul 2021 14:52:11 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Andreas Gruenbacher <agruenba@...hat.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        cluster-devel <cluster-devel@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jan Kara <jack@...e.cz>, Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH] gfs2: Fix mmap + page fault deadlocks

On Thu, Jul 1, 2021 at 2:41 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> So what the direct-IO code _should_ do is to turn an ITER_IOVEC into a
> ITER_KVEC by doing the page lookup ahead of time

Actually, an ITER_BVEC, not ITER_KVEC. It wants a page array, not a
kernel pointer array.

But I hope people understood what I meant..

             Linus