linux-kernel - Re: CIFS: Rename bug on servers not supporting inode numbers

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Message-Id: <E1RMHlS-00HYp9-Hk@intern.SerNet.DE>
Date:	Fri, 4 Nov 2011 12:16:36 +0100
From:	Björn JACKE <bj@...Net.DE>
To:	Anton Altaparmakov <aia21@....ac.uk>
Cc:	Steve French <sfrench@...ba.org>, linux-cifs@...r.kernel.org,
	samba-technical@...ts.samba.org,
	LKML <linux-kernel@...r.kernel.org>,
	Unix Support <unix-support@....cam.ac.uk>,
	linux-fsdevel@...r.kernel.org, xfs@....sgi.com
Subject: Re: CIFS: Rename bug on servers not supporting inode numbers

On 2011-11-03 at 15:20 +0000 Anton Altaparmakov sent off:
> Hi,
> 
> Our CIFS server problems seem to have no end…  The Novell CIFS server does not support server inode numbers (when I try the mount option I get the message it is being turned off as server does not support it) and thus each inode gets a different number each time it is accessed and it gets a different number again for each readdir call.
> 
> The fun happens with rename() when the rename source and target only differ in case, e.g.
> 
> 	touch foo
> 	mv foo Foo

somehow related seems https://bugzilla.kernel.org/show_bug.cgi?id=39512
(as long as kernel bugzilla is dead, see
http://www.linux.sgi.com/archives/xfs-masters/2011-07/msg00022.html )

Case insensitive filesystems seem to be a problem in general on Linux. Not sure
how far kernel and/or glibc are involved in the problem. As a workaround for
the mess you need to do a temporary rename to a different name (not just a case
equivalent name).

Björn
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