linux-ext4 - [PATCH 0/3] ext2, ext4, xfs: hard fail dax mount on unsupported devices

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Date:   Mon,  8 Oct 2018 14:32:46 -0500
From:   Eric Sandeen <sandeen@...deen.net>
To:     linux-xfs@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: [PATCH 0/3] ext2, ext4, xfs: hard fail dax mount on unsupported devices

In response to an earlier xfs patch to change how xfs reacts to
dax incompatibilities, Dave said:

> I suspect we need to be more harsh are rejecting mounts with -o dax
> on devices DAX isn't supported on. This mount option is going into
> production systems - it's not just for "testing" as the comments all
> claim. i Things will break in production systems if DAX isn't
> enabled and they are expecting it to be enabled.

and I tend to agree, so proposing this change to hard-fail a dax mount if
the device doesn't support it, instead of silently disabling the
functionality.  Proposing for ext2, ext4, and xfs to keep behavior in
sync.

Thanks,
-Eric