linux-ext4 - Re: [PATCH v3 00/12] Enable per-file/directory DAX operations V3

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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
>