From patchwork Wed Jun 12 12:45:24 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pankaj Gupta X-Patchwork-Id: 10989877 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 B46C176 for ; Wed, 12 Jun 2019 12:48:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A4169288D9 for ; Wed, 12 Jun 2019 12:48:41 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9683128A4C; Wed, 12 Jun 2019 12:48:41 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2163C288D9 for ; Wed, 12 Jun 2019 12:48:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2409139AbfFLMsg (ORCPT ); Wed, 12 Jun 2019 08:48:36 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46248 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404447AbfFLMsf (ORCPT ); Wed, 12 Jun 2019 08:48:35 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5037E31628E7; Wed, 12 Jun 2019 12:48:28 +0000 (UTC) Received: from dhcp201-121.englab.pnq.redhat.com (ovpn-116-228.sin2.redhat.com [10.67.116.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id 99A5E60BF1; Wed, 12 Jun 2019 12:47:54 +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 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, pagupta@redhat.com, pbonzini@redhat.com, yuval.shaia@oracle.com, kilobyte@angband.pl, jstaron@google.com, rdunlap@infradead.org, snitzer@redhat.com Subject: [PATCH v13 4/7] dm: enable synchronous dax Date: Wed, 12 Jun 2019 18:15:24 +0530 Message-Id: <20190612124527.3763-5-pagupta@redhat.com> In-Reply-To: <20190612124527.3763-1-pagupta@redhat.com> References: <20190612124527.3763-1-pagupta@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Wed, 12 Jun 2019 12:48:35 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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. 'dm_table_supports_dax' is refactored to pass 'iterate_devices_fn' as argument so that the callers can pass the appropriate functions. Suggested-by: Mike Snitzer Signed-off-by: Pankaj Gupta Reviewed-by: Mike Snitzer --- drivers/md/dm-table.c | 24 ++++++++++++++++++------ drivers/md/dm.c | 2 +- drivers/md/dm.h | 5 ++++- 3 files changed, 23 insertions(+), 8 deletions(-) diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 350cf0451456..81c55304c4fa 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -881,7 +881,7 @@ void dm_table_set_type(struct dm_table *t, enum dm_queue_mode type) EXPORT_SYMBOL_GPL(dm_table_set_type); /* validate the dax capability of the target device span */ -static int device_supports_dax(struct dm_target *ti, struct dm_dev *dev, +int device_supports_dax(struct dm_target *ti, struct dm_dev *dev, sector_t start, sector_t len, void *data) { int blocksize = *(int *) data; @@ -890,7 +890,15 @@ static int device_supports_dax(struct dm_target *ti, struct dm_dev *dev, start, len); } -bool dm_table_supports_dax(struct dm_table *t, int blocksize) +/* Check devices support synchronous DAX */ +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); +} + +bool dm_table_supports_dax(struct dm_table *t, + iterate_devices_callout_fn iterate_fn, int *blocksize) { struct dm_target *ti; unsigned i; @@ -903,8 +911,7 @@ bool dm_table_supports_dax(struct dm_table *t, int blocksize) return false; if (!ti->type->iterate_devices || - !ti->type->iterate_devices(ti, device_supports_dax, - &blocksize)) + !ti->type->iterate_devices(ti, iterate_fn, blocksize)) return false; } @@ -940,6 +947,7 @@ static int dm_table_determine_type(struct dm_table *t) struct dm_target *tgt; struct list_head *devices = dm_table_get_devices(t); enum dm_queue_mode live_md_type = dm_get_md_type(t->md); + int page_size = PAGE_SIZE; if (t->type != DM_TYPE_NONE) { /* target already set the table's type */ @@ -984,7 +992,7 @@ static int dm_table_determine_type(struct dm_table *t) verify_bio_based: /* We must use this table as bio-based */ t->type = DM_TYPE_BIO_BASED; - if (dm_table_supports_dax(t, PAGE_SIZE) || + if (dm_table_supports_dax(t, device_supports_dax, &page_size) || (list_empty(devices) && live_md_type == DM_TYPE_DAX_BIO_BASED)) { t->type = DM_TYPE_DAX_BIO_BASED; } else { @@ -1883,6 +1891,7 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, struct queue_limits *limits) { bool wc = false, fua = false; + int page_size = PAGE_SIZE; /* * Copy table's limits to the DM device's request_queue @@ -1910,8 +1919,11 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, } blk_queue_write_cache(q, wc, fua); - if (dm_table_supports_dax(t, PAGE_SIZE)) + if (dm_table_supports_dax(t, device_supports_dax, &page_size)) { blk_queue_flag_set(QUEUE_FLAG_DAX, q); + if (dm_table_supports_dax(t, device_synchronous, NULL)) + set_dax_synchronous(t->md->dax_dev); + } else blk_queue_flag_clear(QUEUE_FLAG_DAX, q); diff --git a/drivers/md/dm.c b/drivers/md/dm.c index b1caa7188209..b92c42a72ad4 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1119,7 +1119,7 @@ static bool dm_dax_supported(struct dax_device *dax_dev, struct block_device *bd if (!map) return false; - ret = dm_table_supports_dax(map, blocksize); + ret = dm_table_supports_dax(map, device_supports_dax, &blocksize); dm_put_live_table(md, srcu_idx); diff --git a/drivers/md/dm.h b/drivers/md/dm.h index 17e3db54404c..0475673337f3 100644 --- a/drivers/md/dm.h +++ b/drivers/md/dm.h @@ -72,7 +72,10 @@ bool dm_table_bio_based(struct dm_table *t); bool dm_table_request_based(struct dm_table *t); void dm_table_free_md_mempools(struct dm_table *t); struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t); -bool dm_table_supports_dax(struct dm_table *t, int blocksize); +bool dm_table_supports_dax(struct dm_table *t, iterate_devices_callout_fn fn, + int *blocksize); +int device_supports_dax(struct dm_target *ti, struct dm_dev *dev, + sector_t start, sector_t len, void *data); void dm_lock_md_type(struct mapped_device *md); void dm_unlock_md_type(struct mapped_device *md);