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Date:   Tue, 10 Nov 2020 09:14:30 -0500
From:   "Theodore Y. Ts'o" <>
To:     Michal Suchanek <>
        Andreas Dilger <>,
        "Darrick J. Wong" <>,
        Ira Weiny <>, Jan Kara <>,
Subject: Re: [PATCH 0/2] Tristate moount option comatibility fixup

On Mon, Nov 09, 2020 at 08:10:07PM +0100, Michal Suchanek wrote:
> Hello,
> after the tristate dax option change some applications fail to detect
> pmem devices because the dax option no longer shows in mtab when device
> is mounted with -o dax.

Which applications?  Name them.

We *really* don't want to encourage applications to make decisions
only based on the mount options.  For example, it could be that the
application's files will have the S_DAX flag set.

It would be a real shame if we are actively encourage applications to
use a broken configuration mechanism which was only used as a hack
while DAX was in experimental status.

						- Ted

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