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=-5.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, URIBL_BLOCKED,USER_AGENT_MUTT autolearn=ham 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 E6BA7C0044C for ; Mon, 29 Oct 2018 17:46:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AF0DC2080A for ; Mon, 29 Oct 2018 17:46:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="b7Opwpa0" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AF0DC2080A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nfs-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727638AbeJ3Cfz (ORCPT ); Mon, 29 Oct 2018 22:35:55 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:45092 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726205AbeJ3Cfz (ORCPT ); Mon, 29 Oct 2018 22:35:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=VgzTK1xsrGwFAV/n+sc4kHQIsjKZMHbEBXj/bfiryCA=; b=b7Opwpa00Wnl69/2nQd0yOmXr 1qTv5gtmvc/kJkaqBKAVXRKLdaKn5/ZYlEzyKV67PFZYrfMSYY8RcBmwS3m4IalXJ7iimK0mzbe96 ju6CGIxpji0isF/vloVv+ux8d2xNI/Gg1tcoQHl5+vBDvrrc97zArGsu1b7P1MPUEurZ0QqDDYA8c OtCylN3UhBGeX93qbUR5CMNCJ93CD+6V5OftNi2vIAdtKYDyzWeVrLd1kmJQG67jAqGzB7rowI3qO VRlhNktawcYt1vqz1XDeCpVmiAZLkTgJYqpJLbLat9hdzKuKw9XpPzzmFDxFAs8D/YfPWFLRnk/Ek aq8ZtUMxw==; Received: from willy by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1gHBcC-0006jk-IH; Mon, 29 Oct 2018 17:46:12 +0000 Date: Mon, 29 Oct 2018 10:46:11 -0700 From: Matthew Wilcox To: Olga Kornievskaia Cc: trond.myklebust@hammerspace.com, anna.schumaker@netapp.com, viro@zeniv.linux.org.uk, smfrench@gmail.com, miklos@szeredi.hu, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-cifs@vger.kernel.org, linux-unionfs@vger.kernel.org, linux-man@vger.kernel.org Subject: Re: [PATCH v5 02/12] VFS: generic cross-device copy_file_range() support for all filesystems Message-ID: <20181029174611.GI28520@bombadil.infradead.org> References: <20181029174059.38326-1-olga.kornievskaia@gmail.com> <20181029174059.38326-4-olga.kornievskaia@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181029174059.38326-4-olga.kornievskaia@gmail.com> User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org On Mon, Oct 29, 2018 at 01:40:49PM -0400, Olga Kornievskaia wrote: > From: Olga Kornievskaia > > If a filesystem does not support cross device or cross file system > type copy offload functionality, then this patch provides a fallback > to a page cache based physical data copy. This means the > copy_file_range() systemcall will never fail with EXDEV, and so in > future userspace will not need to detect or provide a fallback for > failed cross-device copies anymore. > > Signed-off-by: Olga Kornievskaia Reviewed-by: Matthew Wilcox