Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751237AbWHJWVN (ORCPT ); Thu, 10 Aug 2006 18:21:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751228AbWHJWVN (ORCPT ); Thu, 10 Aug 2006 18:21:13 -0400 Received: from smtp.osdl.org ([65.172.181.4]:59351 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S1751218AbWHJWVL (ORCPT ); Thu, 10 Aug 2006 18:21:11 -0400 Date: Thu, 10 Aug 2006 15:18:13 -0700 From: Andrew Morton To: Alex Tomas Cc: Jeff Garzik , linux-fsdevel@vger.kernel.org, cmm@us.ibm.com, ext2-devel@lists.sourceforge.net, Badari Pulavarty , linux-kernel@vger.kernel.org Subject: Re: [Ext2-devel] [PATCH 1/5] Forking ext4 filesystem from ext3 filesystem Message-Id: <20060810151813.ae352cd8.akpm@osdl.org> In-Reply-To: References: <1155172622.3161.73.camel@localhost.localdomain> <20060809233914.35ab8792.akpm@osdl.org> <44DB8036.5020706@us.ibm.com> <44DB936D.2080909@garzik.org> <20060810132720.4d9fced4.akpm@osdl.org> <44DB9E6C.9070808@garzik.org> X-Mailer: Sylpheed version 2.2.7 (GTK+ 2.8.6; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 713 Lines: 18 On Fri, 11 Aug 2006 01:11:23 +0400 Alex Tomas wrote: > >> A buffer_head is the kernel's sole abstraction of a disk block. > >> Filesystems use disk blocks a lot, and they need such an abstraction. > > JG> IMO Al Viro work has shown that you can do pagecache I/O without needing > JG> such a heavyweight system. > > in delayed allocation patch for ext3 (ontop of extents) we do use > bio's for data. As does ext3 with `-o writeback,nobh'. - 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/