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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS 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 CCFFCC04AB4 for ; Tue, 14 May 2019 14:57:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A79422084E for ; Tue, 14 May 2019 14:57:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726572AbfENO5q (ORCPT ); Tue, 14 May 2019 10:57:46 -0400 Received: from mx1.redhat.com ([209.132.183.28]:51220 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726179AbfENO5q (ORCPT ); Tue, 14 May 2019 10:57:46 -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 2EB5A307EA98; Tue, 14 May 2019 14:57:46 +0000 (UTC) Received: from dhcp201-121.englab.pnq.redhat.com (unknown [10.65.16.148]) by smtp.corp.redhat.com (Postfix) with ESMTP id 966CF5D6A6; Tue, 14 May 2019 14:57:23 +0000 (UTC) From: Pankaj Gupta To: 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 Cc: 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, david@fromorbit.com, cohuck@redhat.com, xiaoguangrong.eric@gmail.com, pbonzini@redhat.com, kilobyte@angband.pl, yuval.shaia@oracle.com, jstaron@google.com, pagupta@redhat.com Subject: [PATCH v9 4/7] dm: enable synchronous dax Date: Tue, 14 May 2019 20:24:19 +0530 Message-Id: <20190514145422.16923-5-pagupta@redhat.com> In-Reply-To: <20190514145422.16923-1-pagupta@redhat.com> References: <20190514145422.16923-1-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 [10.5.110.44]); Tue, 14 May 2019 14:57:46 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This patch sets dax device 'DAXDEV_SYNC' flag if all the target devices of device mapper support synchrononous DAX. If device mapper consists of both synchronous and asynchronous dax devices, we don't set 'DAXDEV_SYNC' flag. Signed-off-by: Pankaj Gupta --- drivers/md/dm-table.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index cde3b49b2a91..1cce626ff576 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -886,10 +886,17 @@ static int device_supports_dax(struct dm_target *ti, struct dm_dev *dev, return bdev_dax_supported(dev->bdev, PAGE_SIZE); } +static int device_synchronous(struct dm_target *ti, struct dm_dev *dev, + sector_t start, sector_t len, void *data) +{ + return dax_synchronous(dev->dax_dev); +} + static bool dm_table_supports_dax(struct dm_table *t) { struct dm_target *ti; unsigned i; + bool dax_sync = true; /* Ensure that all targets support DAX. */ for (i = 0; i < dm_table_get_num_targets(t); i++) { @@ -901,7 +908,14 @@ static bool dm_table_supports_dax(struct dm_table *t) if (!ti->type->iterate_devices || !ti->type->iterate_devices(ti, device_supports_dax, NULL)) return false; + + /* Check devices support synchronous DAX */ + if (dax_sync && + !ti->type->iterate_devices(ti, device_synchronous, NULL)) + dax_sync = false; } + if (dax_sync) + set_dax_synchronous(t->md->dax_dev); return true; } -- 2.20.1