From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pankaj Gupta Subject: Re: [PATCH v6 6/6] xfs: disable map_sync for async flush Date: Wed, 24 Apr 2019 00:55:40 -0400 (EDT) Message-ID: <476344290.23160847.1556081740211.JavaMail.zimbra@redhat.com> References: <20190423080612.15361-1-pagupta@redhat.com> <20190423080612.15361-7-pagupta@redhat.com> <20190423220217.GA29573@dread.disaster.area> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20190423220217.GA29573@dread.disaster.area> Sender: linux-kernel-owner@vger.kernel.org To: Dave Chinner 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 , zwisler@kernel.org, vishal l verma , dave jiang , 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 , darrick wong , lcapitulino@redhat.com, kwolf@redhat.com, imammedo@redhat.com, jmoyer@redhat.com, nilal@redhat.com, riel@surriel.com, stefanha@redhat.com, aarcange@redhat.com List-Id: linux-acpi@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. > */ Sure. Will correct this for both xfs & ext4. Thanks, Pankaj > > Cheers, > > Dave. > -- > Dave Chinner > david@fromorbit.com > 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=-6.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED 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 B19E1C10F11 for ; Wed, 24 Apr 2019 04:55:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8B0B521901 for ; Wed, 24 Apr 2019 04:55:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726092AbfDXEzo (ORCPT ); Wed, 24 Apr 2019 00:55:44 -0400 Received: from mx1.redhat.com ([209.132.183.28]:56370 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725958AbfDXEzo (ORCPT ); Wed, 24 Apr 2019 00:55:44 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E819030820EA; Wed, 24 Apr 2019 04:55:43 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id BA12B5F9AC; Wed, 24 Apr 2019 04:55:42 +0000 (UTC) Received: from zmail21.collab.prod.int.phx2.redhat.com (zmail21.collab.prod.int.phx2.redhat.com [10.5.83.24]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id C56391803398; Wed, 24 Apr 2019 04:55:40 +0000 (UTC) Date: Wed, 24 Apr 2019 00:55:40 -0400 (EDT) From: Pankaj Gupta To: Dave Chinner 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 , zwisler@kernel.org, vishal l verma , dave jiang , 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 , darrick wong , 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 , pbonzini@redhat.com, yuval shaia , kilobyte@angband.pl Message-ID: <476344290.23160847.1556081740211.JavaMail.zimbra@redhat.com> In-Reply-To: <20190423220217.GA29573@dread.disaster.area> References: <20190423080612.15361-1-pagupta@redhat.com> <20190423080612.15361-7-pagupta@redhat.com> <20190423220217.GA29573@dread.disaster.area> Subject: Re: [PATCH v6 6/6] xfs: disable map_sync for async flush MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.65.16.97, 10.4.195.22] Thread-Topic: disable map_sync for async flush Thread-Index: 5A0YRiU1z8c6ah9gJxBL4710YUFt6w== X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.47]); Wed, 24 Apr 2019 04:55:44 +0000 (UTC) Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Message-ID: <20190424045540.OxVhZjMlzB14gel4ZEggzge7axtlKeuq1pSuBxtVlk0@z> > > 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. > */ Sure. Will correct this for both xfs & ext4. Thanks, Pankaj > > Cheers, > > Dave. > -- > Dave Chinner > david@fromorbit.com > From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 82A7F212108E3 for ; Tue, 23 Apr 2019 21:55:44 -0700 (PDT) Date: Wed, 24 Apr 2019 00:55:40 -0400 (EDT) From: Pankaj Gupta Message-ID: <476344290.23160847.1556081740211.JavaMail.zimbra@redhat.com> In-Reply-To: <20190423220217.GA29573@dread.disaster.area> References: <20190423080612.15361-1-pagupta@redhat.com> <20190423080612.15361-7-pagupta@redhat.com> <20190423220217.GA29573@dread.disaster.area> Subject: Re: [PATCH v6 6/6] xfs: disable map_sync for async flush MIME-Version: 1.0 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: Dave Chinner Cc: cohuck@redhat.com, jack@suse.cz, kvm@vger.kernel.org, mst@redhat.com, jasowang@redhat.com, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org, adilger kernel , zwisler@kernel.org, aarcange@redhat.com, linux-nvdimm@lists.01.org, david@redhat.com, willy@infradead.org, hch@infradead.org, linux-acpi@vger.kernel.org, linux-ext4@vger.kernel.org, lenb@kernel.org, kilobyte@angband.pl, riel@surriel.com, yuval shaia , stefanha@redhat.com, pbonzini@redhat.com, lcapitulino@redhat.com, kwolf@redhat.com, nilal@redhat.com, tytso@mit.edu, xiaoguangrong eric , darrick wong , rjw@rjwysocki.net, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, imammedo@redhat.com List-ID: > > 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. > */ Sure. Will correct this for both xfs & ext4. Thanks, Pankaj > > Cheers, > > Dave. > -- > Dave Chinner > david@fromorbit.com > _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([209.51.188.92]:34557) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hJ9xI-0006fZ-1I for qemu-devel@nongnu.org; Wed, 24 Apr 2019 00:56:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hJ9wh-0007YA-0n for qemu-devel@nongnu.org; Wed, 24 Apr 2019 00:55:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:34394) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hJ9wg-0007Vl-R3 for qemu-devel@nongnu.org; Wed, 24 Apr 2019 00:55:46 -0400 Date: Wed, 24 Apr 2019 00:55:40 -0400 (EDT) From: Pankaj Gupta Message-ID: <476344290.23160847.1556081740211.JavaMail.zimbra@redhat.com> In-Reply-To: <20190423220217.GA29573@dread.disaster.area> References: <20190423080612.15361-1-pagupta@redhat.com> <20190423080612.15361-7-pagupta@redhat.com> <20190423220217.GA29573@dread.disaster.area> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH v6 6/6] xfs: disable map_sync for async flush List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Dave Chinner 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 , zwisler@kernel.org, vishal l verma , dave jiang , 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 , darrick wong , 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 , pbonzini@redhat.com, yuval shaia , kilobyte@angband.pl > > 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. > */ Sure. Will correct this for both xfs & ext4. Thanks, Pankaj > > Cheers, > > Dave. > -- > Dave Chinner > david@fromorbit.com > 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=-6.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED 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 65A93C10F11 for ; Wed, 24 Apr 2019 04:57:39 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3943020878 for ; Wed, 24 Apr 2019 04:57:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3943020878 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([127.0.0.1]:35741 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hJ9yT-0007D6-Qz for qemu-devel@archiver.kernel.org; Wed, 24 Apr 2019 00:57:37 -0400 Received: from eggs.gnu.org ([209.51.188.92]:34557) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hJ9xI-0006fZ-1I for qemu-devel@nongnu.org; Wed, 24 Apr 2019 00:56:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hJ9wh-0007YA-0n for qemu-devel@nongnu.org; Wed, 24 Apr 2019 00:55:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:34394) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hJ9wg-0007Vl-R3 for qemu-devel@nongnu.org; Wed, 24 Apr 2019 00:55:46 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E819030820EA; Wed, 24 Apr 2019 04:55:43 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id BA12B5F9AC; Wed, 24 Apr 2019 04:55:42 +0000 (UTC) Received: from zmail21.collab.prod.int.phx2.redhat.com (zmail21.collab.prod.int.phx2.redhat.com [10.5.83.24]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id C56391803398; Wed, 24 Apr 2019 04:55:40 +0000 (UTC) Date: Wed, 24 Apr 2019 00:55:40 -0400 (EDT) From: Pankaj Gupta To: Dave Chinner Message-ID: <476344290.23160847.1556081740211.JavaMail.zimbra@redhat.com> In-Reply-To: <20190423220217.GA29573@dread.disaster.area> References: <20190423080612.15361-1-pagupta@redhat.com> <20190423080612.15361-7-pagupta@redhat.com> <20190423220217.GA29573@dread.disaster.area> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.65.16.97, 10.4.195.22] Thread-Topic: disable map_sync for async flush Thread-Index: 5A0YRiU1z8c6ah9gJxBL4710YUFt6w== X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.47]); Wed, 24 Apr 2019 04:55:44 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [PATCH v6 6/6] xfs: disable map_sync for async flush X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: cohuck@redhat.com, jack@suse.cz, kvm@vger.kernel.org, mst@redhat.com, jasowang@redhat.com, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org, adilger kernel , zwisler@kernel.org, aarcange@redhat.com, dave jiang , linux-nvdimm@lists.01.org, vishal l verma , david@redhat.com, willy@infradead.org, hch@infradead.org, linux-acpi@vger.kernel.org, jmoyer@redhat.com, linux-ext4@vger.kernel.org, lenb@kernel.org, kilobyte@angband.pl, riel@surriel.com, yuval shaia , stefanha@redhat.com, pbonzini@redhat.com, dan j williams , lcapitulino@redhat.com, kwolf@redhat.com, nilal@redhat.com, tytso@mit.edu, xiaoguangrong eric , darrick wong , rjw@rjwysocki.net, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, imammedo@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Message-ID: <20190424045540.fr52_SJssL9-XNsCG7N_lQSPmnKPYjBiuIbo8ZwvKuo@z> > > 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. > */ Sure. Will correct this for both xfs & ext4. Thanks, Pankaj > > Cheers, > > Dave. > -- > Dave Chinner > david@fromorbit.com >