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

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Date:   Wed, 12 Feb 2020 14:49:48 -0500
From:   Jeff Moyer <jmoyer@...hat.com>
To:     Ira Weiny <ira.weiny@...el.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

Ira Weiny <ira.weiny@...el.com> writes:

> On Mon, Feb 10, 2020 at 10:15:47AM -0500, Jeff Moyer wrote:
>> Hi, Ira,
>> 
>> Could you please include documentation patches as part of this series?
>
> I do have an update to the vfs.rst doc in
>
> 	fs: Add locking for a dynamic DAX state
>
> I'm happy to do more but was there something specific you would like to see?
> Or documentation in xfs perhaps?

Sorry, I was referring to your statx man page addition.  It would be
nice if we could find a home for the information in your cover letter,
too.  Right now, I'm not sure how application developers are supposed to
figure out how to use the per-inode settings.

If I read your cover letter correctly, the mount option overrides any
on-disk setting.  Is that right?  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?

-Jeff