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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Tue, 11 Jun 2019 16:07:40 -1000
Message-ID: <CAHk-=wgBdTUvjYXKPr_wAAe_Z-hFgM2KMHcsK+b=3w5yMSJ9zw@mail.gmail.com>
Subject: Re: bcachefs status update (it's done cooking; let's get this sucker merged)
To:     Dave Chinner <david@fromorbit.com>
Cc:     Kent Overstreet <kent.overstreet@gmail.com>,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        linux-bcache@vger.kernel.org, Dave Chinner <dchinner@redhat.com>,
        "Darrick J . Wong" <darrick.wong@oracle.com>,
        Zach Brown <zach.brown@ni.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Jens Axboe <axboe@kernel.dk>,
        Josef Bacik <josef@toxicpanda.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Andrew Morton <akpm@linux-foundation.org>,
        Tejun Heo <tj@kernel.org>
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On Mon, Jun 10, 2019 at 9:11 PM Dave Chinner <david@fromorbit.com> wrote:
>
> The same rwsem issues were seen on the mmap_sem, the shrinker rwsem,
> in a couple of device drivers, and so on. i.e. This isn't an XFS
> issue I'm raising here - I'm raising a concern about the lack of
> validation of core infrastructure and it's suitability for
> functionality extensions.

I haven't actually seen the reports.

That said, I do think this should be improving. The random
architecture-specific code is largely going away, and we'll have a
unified rwsem.

It might obviously cause some pain initially, but I think long-term we
should be much better off, at least avoiding the "on particular
configurations" issue..

              Linus