From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.12] helo=sc8-sf-mx2.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1BObCq-0004Ng-5Y for user-mode-linux-devel@lists.sourceforge.net; Fri, 14 May 2004 04:50:24 -0700 Received: from [47.81.138.65] (helo=zsc3s004.nortelnetworks.com) by sc8-sf-mx2.sourceforge.net with esmtp (Exim 4.30) id 1BObCp-0001Az-U5 for user-mode-linux-devel@lists.sourceforge.net; Fri, 14 May 2004 04:50:23 -0700 Message-ID: <40A4B26F.8080507@nortelnetworks.com> From: Joe Marzot MIME-Version: 1.0 Subject: Re: [uml-devel] uml-patch-2.4.24-3 References: <200405122208.i4CM8cCe008920@ccure.user-mode-linux.org> <40A3E217.2080104@nortelnetworks.com> <200405140143.i4E1hWZB005226@ccure.user-mode-linux.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: The user-mode Linux development list List-Post: List-Help: List-Subscribe: , List-Archive: Date: Fri, 14 May 2004 07:50:07 -0400 To: Jeff Dike Cc: Joe Marzot , user-mode-linux-devel@lists.sourceforge.net Jeff Dike wrote: > gmarzot@nortelnetworks.com said: > >>I wonder based on what you say here if two UMLs that hostfs mount the >>same directory and access the same file...one for reading, and the >>other for writing, if the first will see the updates written by the >>second....or maybe I am misinterpretting. > > > You are correct, the writer will cache the new data, and the reader won't see > it until it's flushed out somehow. If you can arrange to have the writer sync > the filesystem before the reader reads the files, then it will get up-to-date > information. > > Otherwise, if this is a problem, we need to make hostfs optionally synchronous. Yes - I think there is value in that. On a different but related topic. I am trying the 2.4.24-2 patch to see if it helps with the kernel panics I posted about in a previous thread but I am now seeing some odd failures with hostfs. Granted my seetup is a bit odd (i.e., atypical). I am mounting Clearcase vobs using view extended pathnames. I have a little script that mounts a whole series of Clearcase vobs...after the script some are mounted and some are not...Clearcase implements these view extended pathnames as a virtual filsystem (mvfs) and there must be something about that which makes the mounting fail occasionally...mouinting other host filesystems works as before. note: mounting the CC mvfs vobs worked in 2.4.24-1 with no problem. I will try again with 2.4.24-3 (w/ fsync - hopefully I can find the right place(s)) and report on that... regards, GSM > > Jeff > > ------------------------------------------------------- This SF.Net email is sponsored by: SourceForge.net Broadband Sign-up now for SourceForge Broadband and get the fastest 6.0/768 connection for only $19.95/mo for the first 3 months! http://ads.osdn.com/?ad_id=2562&alloc_id=6184&op=click _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel