linux-kernel - Re: [PATCH V5 00/12] Enable per-file/per-directory DAX operations V5

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Date:   Wed, 11 Mar 2020 07:44:12 +0100
From:   Christoph Hellwig <hch@....de>
To:     Dave Chinner <david@...morbit.com>
Cc:     "Darrick J. Wong" <darrick.wong@...cle.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Dan Williams <dan.j.williams@...el.com>,
        "Theodore Y. Ts'o" <tytso@....edu>, Jan Kara <jack@...e.cz>,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, akpm@...ux-foundation.org,
        torvalds@...ux-foundation.org
Subject: Re: [PATCH V5 00/12] Enable per-file/per-directory DAX operations
 V5

On Wed, Mar 11, 2020 at 05:39:42PM +1100, Dave Chinner wrote:
> IOWs, the dax_associate_page() related functionality probably needs
> to be a filesystem callout - part of the aops vector, I think, so
> that device dax can still use it. That way XFS can go it's own way,
> while ext4 and device dax can continue to use the existing mechanism
> mechanisn that is currently implemented....

s/XFS/XFS with rmap/, as most XFS file systems currently don't have
that enabled we'll also need to keep the legacy path around.