linux-kernel - Re: [PATCH 7/7] xfs: re-enable XFS per-inode DAX

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Message-ID: <20170926190151.GC31146@linux.intel.com>
Date:   Tue, 26 Sep 2017 13:01:51 -0600
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...chiereds.net>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-nvdimm@...ts.01.org, linux-xfs@...r.kernel.org
Subject: Re: [PATCH 7/7] xfs: re-enable XFS per-inode DAX

On Tue, Sep 26, 2017 at 08:36:11AM +0200, Christoph Hellwig wrote:
> On Mon, Sep 25, 2017 at 05:14:04PM -0600, Ross Zwisler wrote:
> > Re-enable the XFS per-inode DAX flag, preventing S_DAX from changing when
> > any mappings are present.
> 
> Before we re-enable it please come up with a coherent description
> of the per-inode DAX flag that makes sense to a user.  We'll also need
> to find a good place to document it, e.g. a new ioctl_setflags man
> page.

I agree that documentation is a great place to start, if we can just agree on
what we want the functionality to be. :)