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Message-ID: <20200213190513.GB22854@iweiny-DESK2.sc.intel.com>
Date: Thu, 13 Feb 2020 11:05:13 -0800
From: Ira Weiny <ira.weiny@...el.com>
To: Jeff Moyer <jmoyer@...hat.com>
Cc: linux-kernel@...r.kernel.org,
Alexander Viro <viro@...iv.linux.org.uk>,
"Darrick J. Wong" <darrick.wong@...cle.com>,
Dan Williams <dan.j.williams@...el.com>,
Dave Chinner <david@...morbit.com>,
Christoph Hellwig <hch@....de>,
"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
Subject: Re: [PATCH v3 00/12] Enable per-file/directory DAX operations V3
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@...el.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
>
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