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Message-ID: <20210324074751.GA1630@lst.de>
Date: Wed, 24 Mar 2021 08:47:51 +0100
From: Christoph Hellwig <hch@....de>
To: Dan Williams <dan.j.williams@...el.com>
Cc: "ruansy.fnst@...itsu.com" <ruansy.fnst@...itsu.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-xfs <linux-xfs@...r.kernel.org>,
linux-nvdimm <linux-nvdimm@...ts.01.org>,
Linux MM <linux-mm@...ck.org>,
linux-fsdevel <linux-fsdevel@...r.kernel.org>,
device-mapper development <dm-devel@...hat.com>,
"Darrick J. Wong" <darrick.wong@...cle.com>,
david <david@...morbit.com>, Christoph Hellwig <hch@....de>,
Alasdair Kergon <agk@...hat.com>,
Mike Snitzer <snitzer@...hat.com>,
Goldwyn Rodrigues <rgoldwyn@...e.de>,
"qi.fuli@...itsu.com" <qi.fuli@...itsu.com>,
"y-goto@...itsu.com" <y-goto@...itsu.com>
Subject: Re: [PATCH v3 01/11] pagemap: Introduce ->memory_failure()
On Tue, Mar 23, 2021 at 07:19:28PM -0700, Dan Williams wrote:
> So I think the path forward is:
>
> - teach memory_failure() to allow for ranged failures
>
> - let interested drivers register for memory failure events via a
> blocking_notifier_head
Eww. As I said I think the right way is that the file system (or
other consumer) can register a set of callbacks for opening the device.
I have a series I need to finish and send out to do that for block
devices. We probably also need the concept of a holder for the dax
device to make it work nicely, as otherwise we're going to have a bit
of a mess.
> This obviously does not solve Dave's desire to get this type of error
> reporting on block_devices, but I think there's nothing stopping a
> parallel notifier chain from being created for block-devices, but
> that's orthogonal to requirements and capabilities provided by
> dax-devices.
FYI, my series could easily accomodate that if we ever get a block
driver that actually could report such errors.
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