linux-ext4 - [PATCH 0/2] Tristate moount option comatibility fixup

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Message-Id: <cover.1604948373.git.msuchanek@suse.de>
Date:   Mon,  9 Nov 2020 20:10:07 +0100
From:   Michal Suchanek <msuchanek@...e.de>
To:     linux-xfs@...r.kernel.org, linux-ext4@...r.kernel.org
Cc:     Michal Suchanek <msuchanek@...e.de>,
        "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] Tristate moount option comatibility fixup

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.

At first it might seem stupid to detect pmem by looking at the mount
options.

However, if the application actually wants a mount point properly
configured for dax rather than just backed by pmem I do not see any
other easy way.

Also this happens during early installtion steps when the mounted
filesystem is typically empty and you want to perform non-destructive
detection.

If there are better ways to detect dax enabled mount poins I want to
hear all about it. In the meantime we have legacy applications to
support.

It also makes sense that when you mount a device with -o dax it actually
shows dax in the mount options. Not doind so is confusing for humans as
well.

Thanks

Michal

Michal Suchanek (2):
  xfs: show the dax option in mount options.
  ext4: show the dax option in mount options

References: bsc#1178366

 fs/ext4/super.c    | 2 +-
 fs/xfs/xfs_super.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

-- 
2.26.2