From mboxrd@z Thu Jan 1 00:00:00 1970 From: Josef Sipek Subject: Re: [RFC] VFS: FS CoW using redirection Date: Sun, 27 Aug 2006 22:10:57 -0400 Message-ID: <20060828021057.GA30334@filer.fsl.cs.sunysb.edu> References: <200607082041.54489.a1426z@gawab.com> <20060823172402.GC15851@wohnheim.fh-wedel.de> <20060823180552.GC28873@filer.fsl.cs.sunysb.edu> <200608262205.21397.a1426z@gawab.com> <20060827171510.GA3502@wohnheim.fh-wedel.de> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Al Boldi , Eric Van Hensbergen , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: Received: from filer.fsl.cs.sunysb.edu ([130.245.126.2]:29316 "EHLO filer.fsl.cs.sunysb.edu") by vger.kernel.org with ESMTP id S932347AbWH1CLB (ORCPT ); Sun, 27 Aug 2006 22:11:01 -0400 To: =?iso-8859-1?Q?J=F6rn?= Engel Content-Disposition: inline In-Reply-To: <20060827171510.GA3502@wohnheim.fh-wedel.de> Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org On Sun, Aug 27, 2006 at 07:15:10PM +0200, J=F6rn Engel wrote: > On Sat, 26 August 2006 22:05:21 +0300, Al Boldi wrote: =2E..=20 > > > Or you can give Unionfs a try: http://www.unionfs.org > >=20 > > UnionFS is great, but it incurs additional overhead, as it lives be= low the=20 > > real VFS. What could be really great, is to move some basic functi= onality=20 > > abstractions from UnionFS into VFS proper. >=20 > If you want to make this vision happen, one of the missing pieces is = a > method for copyup, an in-kernel copying routine. Unionfs needs is > just the same as Jan's patches do and in the past Linus didn't like m= y > approach of using sendfile for it. You could take a stab at the > splice code and see how that can be used for copyup. The thing with union mounts/unionfs is that some of the functionality m= akes sense to have in a file system while other parts make sense to have in = the VFS - the way I see it, namespace related bits should be in VFS while persistent state should be done on the file system level. Josef "Jeff" Sipek. --=20 If I have trouble installing Linux, something is wrong. Very wrong. - Linus Torvalds - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel= " in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html