Received-SPF: pass (google.com: best guess record for domain of linux-ext4-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 13 Feb 2020 11:05:13 -0800
From:   Ira Weiny <ira.weiny@intel.com>
To:     Jeff Moyer <jmoyer@redhat.com>
Cc:     linux-kernel@vger.kernel.org,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        "Darrick J. Wong" <darrick.wong@oracle.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Dave Chinner <david@fromorbit.com>,
        Christoph Hellwig <hch@lst.de>,
        "Theodore Y. Ts'o" <tytso@mit.edu>, Jan Kara <jack@suse.cz>,
        linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org,
        linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v3 00/12] Enable per-file/directory DAX operations V3
Message-ID: <20200213190513.GB22854@iweiny-DESK2.sc.intel.com>
References: <20200208193445.27421-1-ira.weiny@intel.com>
 <x49imke1nj0.fsf@segfault.boston.devel.redhat.com>
 <20200211201718.GF12866@iweiny-DESK2.sc.intel.com>
 <x49sgjf1t7n.fsf@segfault.boston.devel.redhat.com>
 <20200213190156.GA22854@iweiny-DESK2.sc.intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20200213190156.GA22854@iweiny-DESK2.sc.intel.com>
User-Agent: Mutt/1.11.1 (2018-12-01)
Sender: linux-ext4-owner@vger.kernel.org
Precedence: bulk

On Thu, Feb 13, 2020 at 11:01:57AM -0800, 'Ira Weiny' wrote:
> On Wed, Feb 12, 2020 at 02:49:48PM -0500, Jeff Moyer wrote:
> > Ira Weiny <ira.weiny@intel.com> writes:
> > 
 
[snip]

> > Given that we document the dax mount
> > option as "the way to get dax," it may be a good idea to allow for a
> > user to selectively disable dax, even when -o dax is specified.  Is that
> > possible?
> 
> Not with this patch set.  And I'm not sure how that would work.  The idea was
> that -o dax was simply an override for users who were used to having their
> entire FS be dax.  We wanted to depreciate the use of "-o dax" in general.  The
> individual settings are saved so I don't think it makes sense to ignore the -o
> dax in favor of those settings.  Basically that would IMO make the -o dax
> useless.

Oh and I forgot to mention that setting 'dax' on the root of the FS basically
provides '-o dax' functionality by default with the ability to "turn it off"
for files.

Ira

> 
> Ira
>