linux-kernel - Re: [PATCH] vfs: return EOPNOTSUPP when ioctl

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Date:   Mon, 19 Dec 2016 02:24:02 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Sami Kerola <kerolasa@....fi>
Cc:     Al Viro <viro@...iv.linux.org.uk>, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfs: return EOPNOTSUPP when ioctl_fsthaw() is not
 supported

On Sun, Dec 18, 2016 at 06:57:27PM +0000, Sami Kerola wrote:
> An attempt to freeze a filesystem that does not support such operation is
> reported as EOPNOTSUPP to user.  Running unfreeze to the same filesystem
> returns EINVAL.  Later is a little misleading, users can mix that message
> with return value from unfreezing when filesystem is not frozen.

This is going to break gfs2 with it's odd ->that_super method.