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Date: Sat, 9 Jul 2016 03:52:30 +0100
From: Al Viro <viro@ZenIV.linux.org.uk>
To: Oleg Drokin <green@linuxhacker.ru>
Cc: Jeff Layton <jlayton@poochiereds.net>,
        "J. Bruce Fields" <bfields@fieldses.org>, linux-nfs@vger.kernel.org,
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Subject: Re: [PATCH] nfsd: Make creates return EEXIST correctly instead of
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On Fri, Jul 08, 2016 at 11:59:50AM -0400, Oleg Drokin wrote:

> "If path names a symbolic link, mkdir() shall fail and set errno to [EEXIST]."
> 
> This sounds pretty straightforward to me, no?
> Since it does not matter that we do not have write permissions here, because
> the name already exists.

When more than one condition applies, we have every right to return any of
them.  POSIX does *NOT* specify the order of checks.  Never had.