linux-kernel - Re: [PATCH] ncpfs: fix rmdir returns Device or resource busy

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Message-ID: <20130613020122.GA20274@ZenIV.linux.org.uk>
Date:	Thu, 13 Jun 2013 03:01:22 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Dave Chiluk <chiluk@...onical.com>
Cc:	Petr Vandrovec <petr@...drovec.name>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ncpfs: fix rmdir returns Device or resource busy

On Fri, Jun 07, 2013 at 05:14:52PM +0100, Al Viro wrote:
> On Fri, Jun 07, 2013 at 11:09:05AM -0500, Dave Chiluk wrote:
> > Can't you just use the patch from my original e-mail?  Anyhow I attached
> > it an already signed-off patch.
> > 
> > Al Viro Can you integrate it now?
> 
> Applied...  FWIW, patch directly in mail body is more convenient to deal with.

Actually, looking at that stuff...  Why are we bothering with -EBUSY for
removal of busy directories on ncpfs, anyway?  It's not just rmdir(), it's
overwriting rename() as well.  IS_DEADDIR checks in fs/namei.c and fs/readdir.c
mean that the only method of ncpfs directories that might get called after
successful removal is ->setattr() and it would be trivial to add the check
in ncp_notify_change() that would make it fail for dead directories without
bothering the server at all...

Related question: what happens if you open / unlink / fchmod on ncpfs?
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