From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.11] helo=sc8-sf-mx1.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Cipher TLSv1:DES-CBC3-SHA:168) (Exim 3.31-VA-mm2 #1 (Debian)) id 19uIof-0002wc-00 for ; Tue, 02 Sep 2003 14:35:57 -0700 Received: from lakshmi.addtoit.com ([198.99.130.6] helo=lakshmi.solana.com) by sc8-sf-mx1.sourceforge.net with esmtp (Exim 4.22) id 19uIoe-000546-8r for user-mode-linux-devel@lists.sourceforge.net; Tue, 02 Sep 2003 14:35:56 -0700 Received: from ccure.karaya.com (lakshmi.solana.com [127.0.0.1]) by lakshmi.solana.com (8.11.2/8.9.3) with ESMTP id h82LSij02293 for ; Tue, 2 Sep 2003 17:28:45 -0400 Message-Id: <200309021900.h82J0YHx001746@ccure.karaya.com> Subject: Re: [uml-devel] uml-patch-2.4.20-7 In-Reply-To: Your message of "Sat, 30 Aug 2003 23:47:49 BST." <3F512995.4050209@vgertech.com> References: <200308071929.h77JTo5N017958@uml.karaya.com> <3F512995.4050209@vgertech.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii From: Jeff Dike Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Id: The user-mode Linux development list List-Unsubscribe: , List-Archive: Date: Tue, 02 Sep 2003 15:00:34 -0400 To: Nuno Silva Cc: user-mode-linux-devel@lists.sourceforge.net nuno.silva@vgertech.com said: > Can you give us a brief explanation on what this does? :) It's not useful at the moment. It's to support the standalone COW driver when I get around to finishing it. You will set up a COW file on the command line like cow0=/dev/ubd1,/dev/ubd0 ubd0=backing-file ubd1=cow-file Since I can't break the existing ubdx=cow-file,backing-file syntax, that will need to continue to be supported. This causes a problem with ubd1=cow-file in the first example. As the ubd driver is currently written, this will cause ubd1 to be effectively ubd1=cow-file,backing-file because it will read the backing file from the COW header. With the standalone COW driver, this is undesirable. We want ubd1 to not be interpretted as a COW file since cow0 will be doing that. So, the best thing I could think of was to make you specify ubd1 as ubd1d=cow-file which says 'this is just blocks of data, even though it looks like a COW file'. This is non-optimal since the common case in the long run (standalone COW) should be easy and not require any special extra crap, but I don't see a way of doing that without breaking everyone's scripts. Jeff ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel