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Date: Tue, 26 Sep 2017 08:36:11 +0200
From: Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 7/7] xfs: re-enable XFS per-inode DAX
Message-ID: <20170926063611.GD6870@lst.de>
References: <20170925231404.32723-1-ross.zwisler@linux.intel.com> <20170925231404.32723-8-ross.zwisler@linux.intel.com>
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To: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org, "Darrick J. Wong" <darrick.wong@oracle.com>, "J. Bruce Fields" <bfields@fieldses.org>, Christoph Hellwig <hch@lst.de>, Dan Williams <dan.j.williams@intel.com>, Dave Chinner <david@fromorbit.com>, Jan Kara <jack@suse.cz>, Jeff Layton <jlayton@poochiereds.net>, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-nvdimm@lists.01.org, linux-xfs@vger.kernel.org

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.