From mboxrd@z Thu Jan 1 00:00:00 1970 From: "J. Bruce Fields" Subject: Re: Case sensitivity in NFS files Date: Thu, 9 Oct 2008 14:36:18 -0400 Message-ID: <20081009183618.GA31168@fieldses.org> References: <200810091839.49445.sojkam1@fel.cvut.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-nfs@vger.kernel.org To: Michal Sojka Return-path: Received: from mail.fieldses.org ([66.93.2.214]:37797 "EHLO fieldses.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753793AbYJISgU (ORCPT ); Thu, 9 Oct 2008 14:36:20 -0400 In-Reply-To: <200810091839.49445.sojkam1-jQs2MHkdoM/twjQa/ONI9g@public.gmane.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: On Thu, Oct 09, 2008 at 06:39:49PM +0200, Michal Sojka wrote: > I'm experiencing strange problem with case sensitivity of files on NFS3 > filesystem. I want to backup my server to a NAS device. The server is: > Linux rtime 2.6.25-gentoo-r8 #6 SMP Thu Oct 9 13:00:08 CEST 2008 i686 > and NAS is: > Linux RtimeBackup 2.6.15 #722 Fri Sep 19 20:23:15 CST 2008 armv5tejl unknown Do you know which filesystem it exports? I haven't played with exports of case-insensitive filesystems, but the behavior you saw would seem consistent with that: > On NFS, I sometimes get the following (neither "A" nor "a" files existed > before execution): > > 1. open(A): Success > 2. lstat(A): Success > 3. lstat(a): Success So we looked up "a" on the filesystem, and it found "A", since it considers the two names the same. > 4. unlink(a): Success And the unlink worked too. > 5. lstat(A): Stale NFS file handle But we don't know that it resulted in deleting "A", so we send this stat with the old filehandle and find the file's gone.... > 6. lstat(a): No such file or directory > > This happens when the program is run for the first time. When I run it for the > second time, I get the expected output and file "A" is created. The second time it's probably cached the non-existance of "a", so just returns -ENOENT on lstat(a) instead of asking the server about it. --b. > After I > remove the A file, I get the "wrong" output again. > > Does anybody know, what is causing this behavior? > > Thanks > Michal > > P.S.: Please CC me when replying. > -- > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html