linux-ext4 - Re: futher decouple DAX from block devices

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Message-ID: <21ff4333-e567-2819-3ae0-6a2e83ec7ce6@sandeen.net>
Date:   Wed, 3 Nov 2021 12:59:31 -0500
From:   Eric Sandeen <sandeen@...deen.net>
To:     Christoph Hellwig <hch@....de>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Ira Weiny <ira.weiny@...el.com>, dm-devel@...hat.com,
        linux-xfs@...r.kernel.org, nvdimm@...ts.linux.dev,
        linux-s390@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: futher decouple DAX from block devices

On 10/17/21 11:40 PM, Christoph Hellwig wrote:
> Hi Dan,
> 
> this series cleans up and simplifies the association between DAX and block
> devices in preparation of allowing to mount file systems directly on DAX
> devices without a detour through block devices.

Christoph, can I ask what the end game looks like, here? If dax is completely
decoupled from block devices, are there user-visible changes? If I want to
run fs-dax on a pmem device - what do I point mkfs at, if not a block device?

Thanks,
-Eric