Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 26 Jul 2001 11:28:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 26 Jul 2001 11:28:26 -0400 Received: from router-100M.swansea.linux.org.uk ([194.168.151.17]:65037 "EHLO the-village.bc.nu") by vger.kernel.org with ESMTP id ; Thu, 26 Jul 2001 11:28:15 -0400 Subject: Re: ext3-2.4-0.9.4 To: matthias.andree@stud.uni-dortmund.de (Matthias Andree) Date: Thu, 26 Jul 2001 16:28:49 +0100 (BST) Cc: riel@conectiva.com.br (Rik van Riel), alan@lxorguk.ukuu.org.uk (Alan Cox), matthias.andree@stud.uni-dortmund.de (Matthias Andree), akpm@zip.com.au (Andrew Morton), linux-kernel@vger.kernel.org (lkml), ext3-users@redhat.com (ext3-users@redhat.com) In-Reply-To: <20010726164516.R17244@emma1.emma.line.org> from "Matthias Andree" at Jul 26, 2001 04:45:16 PM X-Mailer: ELM [version 2.5 PL5] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-Id: From: Alan Cox Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Original-Recipient: rfc822;linux-kernel-outgoing > them, and MTAs are portable, they choose chattr +S on Linux. And that's > a performance problem because it doesn't come for free, but also with > synchronous data updates, which are unnecessary because there is > fsync(). chattr +S and atomic updates hitting disk then returning to the app will give the same performance. You can also fsync() the directory. > the "my rename call has returned 0" event. They expect that with the > call returning the rename operation has completed ultimately, finally, > for good, definitely and the old file will not reappear after a crash. Actually the old file re-appearing after the crash is irrelevant. It will have a previously logged message id. And if you are not doing message id histories then you have replay races at the SMTP level anyway > This still implies the drive doesn't lie to the OS about the completion > of write requests: write cache == off. Write cache off is not a feature available on many modern disks. You already lost the battle before you started. Alan - 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/