From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steve French Subject: copy-on-write files Date: Mon, 11 May 2009 12:08:17 -0500 Message-ID: <524f69650905111008p4b3d9256qdd0a86c08db31b37@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: samba-technical , linux-fsdevel To: joel.becker@oracle.com Return-path: Received: from yx-out-2324.google.com ([74.125.44.28]:62627 "EHLO yx-out-2324.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758270AbZEKRIR (ORCPT ); Mon, 11 May 2009 13:08:17 -0400 Received: by yx-out-2324.google.com with SMTP id 3so1727416yxj.1 for ; Mon, 11 May 2009 10:08:17 -0700 (PDT) Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Joel, Looking at your documentation for the new "reflink" syscall (to create copy-on-write files): http://git.kernel.org/?p=linux/kernel/git/jlbec/ocfs2.git;a=blob;f=Documentation/filesystems/reflink.txt;h=58a6b3879114c0cb591fb736152b30291037edd2;hb=c04db1c934e67337318b177688c0b882297fdd66 Have you looked at whether this is close enough to the existing (e.g. Windows NTFS) copy-on-write syntax/feature so that we could use it under Samba (and on the client side from cifs and in the future smb2). Windows added copy-on-write about 9 or 10 years ago and uses it extensively. although I have not researched enough to see what creating these would look like over the network. -- Thanks, Steve