From patchwork Tue Jun 11 16:38:00 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pankaj Gupta X-Patchwork-Id: 10987841 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9200B14DB for ; Tue, 11 Jun 2019 17:02:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7F3BD2807B for ; Tue, 11 Jun 2019 17:02:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 72539285A8; Tue, 11 Jun 2019 17:02:02 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 204832807B for ; Tue, 11 Jun 2019 17:02:02 +0000 (UTC) Received: from localhost ([::1]:33074 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hak9p-0005zZ-BU for patchwork-qemu-devel@patchwork.kernel.org; Tue, 11 Jun 2019 13:02:01 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:52113) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hak32-0007gO-Oa for qemu-devel@nongnu.org; Tue, 11 Jun 2019 12:55:02 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hajqy-0002UR-SW for qemu-devel@nongnu.org; Tue, 11 Jun 2019 12:42:36 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46132) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hajqr-0002Oe-9j for qemu-devel@nongnu.org; Tue, 11 Jun 2019 12:42:29 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D767E2F8BE5; Tue, 11 Jun 2019 16:42:17 +0000 (UTC) Received: from dhcp201-121.englab.pnq.redhat.com (ovpn-116-60.sin2.redhat.com [10.67.116.60]) by smtp.corp.redhat.com (Postfix) with ESMTP id C58AB5D721; Tue, 11 Jun 2019 16:41:40 +0000 (UTC) From: Pankaj Gupta To: dm-devel@redhat.com, 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 Date: Tue, 11 Jun 2019 22:08:00 +0530 Message-Id: <20190611163802.25352-6-pagupta@redhat.com> In-Reply-To: <20190611163802.25352-1-pagupta@redhat.com> References: <20190611163802.25352-1-pagupta@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Tue, 11 Jun 2019 16:42:23 +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: [Qemu-devel] [PATCH v12 5/7] dax: check synchronous mapping is supported X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pagupta@redhat.com, rdunlap@infradead.org, jack@suse.cz, snitzer@redhat.com, mst@redhat.com, jasowang@redhat.com, david@fromorbit.com, lcapitulino@redhat.com, adilger.kernel@dilger.ca, zwisler@kernel.org, aarcange@redhat.com, dave.jiang@intel.com, jstaron@google.com, darrick.wong@oracle.com, vishal.l.verma@intel.com, david@redhat.com, willy@infradead.org, hch@infradead.org, jmoyer@redhat.com, nilal@redhat.com, lenb@kernel.org, kilobyte@angband.pl, riel@surriel.com, yuval.shaia@oracle.com, stefanha@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com, kwolf@redhat.com, tytso@mit.edu, xiaoguangrong.eric@gmail.com, cohuck@redhat.com, rjw@rjwysocki.net, imammedo@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP This patch introduces 'daxdev_mapping_supported' helper which checks if 'MAP_SYNC' is supported with filesystem mapping. It also checks if corresponding dax_device is synchronous. Virtio pmem device is asynchronous and does not not support VM_SYNC. Suggested-by: Jan Kara Signed-off-by: Pankaj Gupta Reviewed-by: Jan Kara --- include/linux/dax.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/include/linux/dax.h b/include/linux/dax.h index 2b106752b1b8..267251a394fa 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -42,6 +42,18 @@ void dax_write_cache(struct dax_device *dax_dev, bool wc); bool dax_write_cache_enabled(struct dax_device *dax_dev); bool dax_synchronous(struct dax_device *dax_dev); void set_dax_synchronous(struct dax_device *dax_dev); +/* + * Check if given mapping is supported by the file / underlying device. + */ +static inline bool daxdev_mapping_supported(struct vm_area_struct *vma, + struct dax_device *dax_dev) +{ + if (!(vma->vm_flags & VM_SYNC)) + return true; + if (!IS_DAX(file_inode(vma->vm_file))) + return false; + return dax_synchronous(dax_dev); +} #else static inline struct dax_device *dax_get_by_host(const char *host) { @@ -69,6 +81,11 @@ static inline bool dax_write_cache_enabled(struct dax_device *dax_dev) { return false; } +static inline bool daxdev_mapping_supported(struct vm_area_struct *vma, + struct dax_device *dax_dev) +{ + return !(vma->vm_flags & VM_SYNC); +} #endif struct writeback_control;