Received: with ECARTIS (v1.0.0; list xfs); Thu, 15 May 2008 07:10:53 -0700 (PDT) X-Spam-Checker-Version: SpamAssassin 3.3.0-r574664 (2007-09-11) on oss.sgi.com X-Spam-Level: X-Spam-Status: No, score=-2.5 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=3.3.0-r574664 Received: from cuda.sgi.com (cuda1.sgi.com [192.48.168.28]) by oss.sgi.com (8.12.11.20060308/8.12.11/SuSE Linux 0.7) with ESMTP id m4FEAYUM031928 for ; Thu, 15 May 2008 07:10:36 -0700 X-ASG-Debug-ID: 1210860682-173703d50000-NocioJ X-Barracuda-URL: http://cuda.sgi.com:80/cgi-bin/mark.cgi Received: from bombadil.infradead.org (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 50C2F112AC74; Thu, 15 May 2008 07:11:22 -0700 (PDT) Received: from bombadil.infradead.org (bombadil.infradead.org [18.85.46.34]) by cuda.sgi.com with ESMTP id GLi0StEE3qkSXBr8; Thu, 15 May 2008 07:11:22 -0700 (PDT) Received: from hch by bombadil.infradead.org with local (Exim 4.68 #1 (Red Hat Linux)) id 1JweAz-0002lG-Ns; Thu, 15 May 2008 14:11:21 +0000 Date: Thu, 15 May 2008 10:11:21 -0400 From: Christoph Hellwig To: Anton Altaparmakov Cc: Barry Naujok , Christoph Hellwig , xfs@oss.sgi.com, linux-fsdevel X-ASG-Orig-Subj: Re: [PATCH 3/4] XFS: Return case-insensitive match for dentry cache Subject: Re: [PATCH 3/4] XFS: Return case-insensitive match for dentry cache Message-ID: <20080515141121.GA14198@infradead.org> References: <20080513075749.477238845@chook.melbourne.sgi.com> <20080513080152.911303131@chook.melbourne.sgi.com> <20080513085724.GC21919@infradead.org> <20080515045700.GA4328@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html X-Barracuda-Connect: bombadil.infradead.org[18.85.46.34] X-Barracuda-Start-Time: 1210860683 X-Barracuda-Bayes: INNOCENT GLOBAL 0.0000 1.0000 -2.0210 X-Barracuda-Virus-Scanned: by cuda.sgi.com at sgi.com X-Barracuda-Spam-Score: -2.02 X-Barracuda-Spam-Status: No, SCORE=-2.02 using per-user scores of TAG_LEVEL=2.0 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=2.1 tests= X-Barracuda-Spam-Report: Code version 3.1, rules version 3.1.50434 Rule breakdown below pts rule name description ---- ---------------------- -------------------------------------------------- X-Virus-Scanned: ClamAV 0.91.2/6021/Wed Feb 27 15:55:48 2008 on oss.sgi.com X-Virus-Status: Clean X-archive-position: 15916 X-ecartis-version: Ecartis v1.0.0 Sender: xfs-bounce@oss.sgi.com Errors-to: xfs-bounce@oss.sgi.com X-original-sender: hch@infradead.org Precedence: bulk X-list: xfs On Thu, May 15, 2008 at 02:43:44PM +0100, Anton Altaparmakov wrote: > Yes, and you can get the performance back if you allow negative dentries to > be created. You just have to make sure that every time a directory entry > is created in directory X, all negative dentries which are children of > directory X are thrown away. We might even be able to optimize this a little by calling d_compare on each alias to see if it hashes down to the same one down in the fs.