From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 07/39] vfs: export vfs_ioctl() to modules
Date: Mon, 11 Jun 2018 09:24:12 -0700
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To: Miklos Szeredi <miklos@szeredi.hu>
Cc: Al Viro <viro@zeniv.linux.org.uk>, Christoph Hellwig <hch@infradead.org>, Miklos Szeredi <mszeredi@redhat.com>, overlayfs <linux-unionfs@vger.kernel.org>, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
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On Mon, Jun 11, 2018 at 09:19:01AM +0200, Miklos Szeredi wrote:
> We don't.  Obviously need to make sure to only ever do ioctl's in
> overlayfs that have a common definition across filesystems.  Not a lot
> of those, luckily...

Which are those?  If they are common and possibly called from kernel
code they should probably be made into methods instead.