From mboxrd@z Thu Jan 1 00:00:00 1970 From: Goswin von Brederlow Subject: Re: [fuse-devel] delta filesystem prototype Date: Wed, 04 Mar 2009 12:52:19 +0100 Message-ID: <8763ip5wuk.fsf@frosties.localdomain> References: <9884.1236069117@jrobl> <87r61ec1o7.fsf@frosties.localdomain> <7200.1236085884@jrobl> <1236094078.6988.3.camel@norville.austin.ibm.com> <19642.1236095410@jrobl> <1236095699.6988.6.camel@norville.austin.ibm.com> <19966.1236096162@jrobl> <1236096857.6988.28.camel@norville.austin.ibm.com> <20279.1236097152@jrobl> <1236098800.6988.82.camel@norville.austin.ibm.com> <21460.1236100412@jrobl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Dave Kleikamp , Goswin von Brederlow , Miklos Szeredi , linux-fsdevel@vger.kernel.org, fuse-devel@lists.sourceforge.net To: hooanon05@yahoo.co.jp Return-path: Received: from fmmailgate03.web.de ([217.72.192.234]:36837 "EHLO fmmailgate03.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750796AbZCDLwX (ORCPT ); Wed, 4 Mar 2009 06:52:23 -0500 In-Reply-To: <21460.1236100412@jrobl> (hooanon's message of "Wed, 04 Mar 2009 02:13:32 +0900") Sender: linux-fsdevel-owner@vger.kernel.org List-ID: hooanon05@yahoo.co.jp writes: > Dave Kleikamp: >> I understand the file physically resides on the lower layer. The delta >> file system will presents a new file on a different path that initially >> has the contents of the lower file. If you are mmapping the file >> presented by the delta files system, then both mmaps will see the same >> modified data. > > Ok, I will read fuse (instead of deltafs.c) again. > Thank you. > > > J. R. Okajima By the way. If you mmap a file in fuse shared twice wouldn't the kernel share the physical pages. So the first access calls fuse and loads the data into memory, the second access would just get the same physical page mapped. Right? MfG Goswin