From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 844D8C433E1 for ; Thu, 27 Aug 2020 16:18:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 69BFE2087C for ; Thu, 27 Aug 2020 16:18:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728037AbgH0QSo (ORCPT ); Thu, 27 Aug 2020 12:18:44 -0400 Received: from nautica.notk.org ([91.121.71.147]:42190 "EHLO nautica.notk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727784AbgH0QSm (ORCPT ); Thu, 27 Aug 2020 12:18:42 -0400 Received: by nautica.notk.org (Postfix, from userid 1001) id 30B06C009; Thu, 27 Aug 2020 18:18:39 +0200 (CEST) Date: Thu, 27 Aug 2020 18:18:24 +0200 From: Dominique Martinet To: David Howells Cc: Christoph Hellwig , Alexander Viro , Matthew Wilcox , Jeff Layton , Dave Wysochanski , Trond Myklebust , Anna Schumaker , Steve French , Eric Van Hensbergen , linux-cachefs@redhat.com, linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [GIT PULL] fscache rewrite -- please drop for now Message-ID: <20200827161824.GC31016@nautica> References: <20200810164044.GA31753@lst.de> <1851200.1596472222@warthog.procyon.org.uk> <447452.1596109876@warthog.procyon.org.uk> <667820.1597072619@warthog.procyon.org.uk> <1428311.1598542135@warthog.procyon.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <1428311.1598542135@warthog.procyon.org.uk> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org David Howells wrote on Thu, Aug 27, 2020: > Christoph Hellwig wrote: > > > FYI, a giant rewrite dropping support for existing consumer is always > > rather awkward. Is there any way you could pre-stage some infrastructure > > changes, and then do a temporary fscache2, which could then be renamed > > back to fscache once everyone switched over? > > That's a bit tricky. There are three points that would have to be shared: the > userspace miscdev interface, the backing filesystem and the single index tree. > > It's probably easier to just have a go at converting 9P and cifs. Making the > old and new APIs share would be a fairly hefty undertaking in its own right. While I agree something incremental is probably better, I have some free time over the next few weeks so will take a shot at 9p; it's definitely going to be easier. Should I submit patches to you or wait until Linus merges it next cycle and send them directly? I see Jeff's ceph patches are still in his tree's ceph-fscache-iter branch and I don't see them anywhere in your tree. -- Dominique