Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752787AbWKCNbr (ORCPT ); Fri, 3 Nov 2006 08:31:47 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752973AbWKCNbr (ORCPT ); Fri, 3 Nov 2006 08:31:47 -0500 Received: from artax.karlin.mff.cuni.cz ([195.113.31.125]:219 "EHLO artax.karlin.mff.cuni.cz") by vger.kernel.org with ESMTP id S1751676AbWKCNbr (ORCPT ); Fri, 3 Nov 2006 08:31:47 -0500 Date: Fri, 3 Nov 2006 14:31:46 +0100 (CET) From: Mikulas Patocka To: =?iso-8859-1?Q?J=F6rn?= Engel Cc: linux-kernel@vger.kernel.org Subject: Re: New filesystem for Linux In-Reply-To: <20061103122126.GC11947@wohnheim.fh-wedel.de> Message-ID: References: <20061102235920.GA886@wohnheim.fh-wedel.de> <20061103101901.GA11947@wohnheim.fh-wedel.de> <20061103122126.GC11947@wohnheim.fh-wedel.de> X-Personality-Disorder: Schizoid MIME-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="1908636959-725541422-1162560706=:17427" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1396 Lines: 40 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --1908636959-725541422-1162560706=:17427 Content-Type: TEXT/PLAIN; charset=iso-8859-2; format=flowed Content-Transfer-Encoding: 8BIT >>> I am fully aware the counters are effectively 48-bit. If they were >>> just 32-bit, you would likely have hit the problem yourself already. >> >> Given the seek time 0.01s, 31-bit value would last for minimum time of 248 >> days when doing only syncs and nothing else. 47-bit value will last for >> reasonably long. > > So you can at most do one transaction per drive seek? That would > definitely solve the overflow case, but hardly sounds like a > high-performance filesystem. :) Really it can batch any number of modifications into one transaction (unless fsync or sync is called). Transaction is closed only on fsync/sync, if 2 minutes pass (can be adjusted) or when the disk runs out of space. Mikulas Mikulas > J?rn > > -- > Data expands to fill the space available for storage. > -- Parkinson's Law > --1908636959-725541422-1162560706=:17427-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/