linux-kernel - Re: [RFC 5/9] iov_iter: Add iov_iter_fault_in

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Message-ID: <CAHk-=wgoBx_GzTQMj_HQGAR+f+7VRJ6JbU9UBfuPHKLfTVMPGQ@mail.gmail.com>
Date:   Sat, 12 Jun 2021 16:17:30 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Andreas Gruenbacher <agruenba@...hat.com>,
        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: [RFC 5/9] iov_iter: Add iov_iter_fault_in_writeable()

On Sat, Jun 12, 2021 at 2:47 PM Al Viro <viro@...iv.linux.org.uk> wrote:
>
>         O_DIRECT case is a PITA - there we use GUP and there's no way
> to tell GUP that in the current situation we do *NOT* want to hit
> ->fault()/->page_mkwrite()/etc.  pagefault_disable() won't be even
> noticed there...

Well, we could change that.

And we do have get_user_pages_fast_only() these days.

              Linus