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=-8.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_MUTT autolearn=unavailable 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 A0B0DC282DD for ; Tue, 23 Apr 2019 22:28:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7012C218D2 for ; Tue, 23 Apr 2019 22:28:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728179AbfDWW2v (ORCPT ); Tue, 23 Apr 2019 18:28:51 -0400 Received: from mail105.syd.optusnet.com.au ([211.29.132.249]:36421 "EHLO mail105.syd.optusnet.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726325AbfDWW2v (ORCPT ); Tue, 23 Apr 2019 18:28:51 -0400 X-Greylist: delayed 1583 seconds by postgrey-1.27 at vger.kernel.org; Tue, 23 Apr 2019 18:28:49 EDT Received: from dread.disaster.area (pa49-180-172-16.pa.nsw.optusnet.com.au [49.180.172.16]) by mail105.syd.optusnet.com.au (Postfix) with ESMTPS id 613CD105EA0B; Wed, 24 Apr 2019 08:02:18 +1000 (AEST) Received: from dave by dread.disaster.area with local (Exim 4.92) (envelope-from ) id 1hJ3UX-0002gQ-2Q; Wed, 24 Apr 2019 08:02:17 +1000 Date: Wed, 24 Apr 2019 08:02:17 +1000 From: Dave Chinner To: Pankaj Gupta Cc: linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-acpi@vger.kernel.org, qemu-devel@nongnu.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, dan.j.williams@intel.com, zwisler@kernel.org, vishal.l.verma@intel.com, dave.jiang@intel.com, mst@redhat.com, jasowang@redhat.com, willy@infradead.org, rjw@rjwysocki.net, hch@infradead.org, lenb@kernel.org, jack@suse.cz, tytso@mit.edu, adilger.kernel@dilger.ca, darrick.wong@oracle.com, lcapitulino@redhat.com, kwolf@redhat.com, imammedo@redhat.com, jmoyer@redhat.com, nilal@redhat.com, riel@surriel.com, stefanha@redhat.com, aarcange@redhat.com, david@redhat.com, cohuck@redhat.com, xiaoguangrong.eric@gmail.com, pbonzini@redhat.com, yuval.shaia@oracle.com, kilobyte@angband.pl Subject: Re: [PATCH v6 6/6] xfs: disable map_sync for async flush Message-ID: <20190423220217.GA29573@dread.disaster.area> References: <20190423080612.15361-1-pagupta@redhat.com> <20190423080612.15361-7-pagupta@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190423080612.15361-7-pagupta@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Optus-CM-Score: 0 X-Optus-CM-Analysis: v=2.2 cv=UJetJGXy c=1 sm=1 tr=0 cx=a_idp_d a=P9M234EABmfYNCwpuVjnFw==:117 a=P9M234EABmfYNCwpuVjnFw==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=kj9zAlcOel0A:10 a=oexKYjalfGEA:10 a=20KFwNOVAAAA:8 a=7-415B0cAAAA:8 a=zOUUIwEDNWhzvqsACr4A:9 a=CjuIK1q_8ugA:10 a=biEYGPWJfzWAr4FL6Ov7:22 Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org On Tue, Apr 23, 2019 at 01:36:12PM +0530, Pankaj Gupta wrote: > Dont support 'MAP_SYNC' with non-DAX files and DAX files > with asynchronous dax_device. Virtio pmem provides > asynchronous host page cache flush mechanism. We don't > support 'MAP_SYNC' with virtio pmem and xfs. > > Signed-off-by: Pankaj Gupta > --- > fs/xfs/xfs_file.c | 10 ++++++---- > 1 file changed, 6 insertions(+), 4 deletions(-) > > diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c > index 1f2e2845eb76..0e59be018511 100644 > --- a/fs/xfs/xfs_file.c > +++ b/fs/xfs/xfs_file.c > @@ -1196,11 +1196,13 @@ xfs_file_mmap( > struct file *filp, > struct vm_area_struct *vma) > { > - /* > - * We don't support synchronous mappings for non-DAX files. At least > - * until someone comes with a sensible use case. > + struct dax_device *dax_dev = xfs_find_daxdev_for_inode > + (file_inode(filp)); > + > + /* We don't support synchronous mappings for non-DAX files and > + * for DAX files if underneath dax_device is not synchronous. > */ /* * This is the correct multi-line comment format. Please * update the patch to maintain the existing comment format. */ Cheers, Dave. -- Dave Chinner david@fromorbit.com