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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 2EC6FC6778C for ; Fri, 6 Jul 2018 05:51:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DEC3A208D5 for ; Fri, 6 Jul 2018 05:51:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DEC3A208D5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934271AbeGFFvY (ORCPT ); Fri, 6 Jul 2018 01:51:24 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:33284 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934160AbeGFFvV (ORCPT ); Fri, 6 Jul 2018 01:51:21 -0400 Received: from localhost (D57D388D.static.ziggozakelijk.nl [213.125.56.141]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id D6E2786A; Fri, 6 Jul 2018 05:51:20 +0000 (UTC) From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, NeilBrown , Shaohua Li , Jack Wang Subject: [PATCH 4.14 36/61] md: move suspend_hi/lo handling into core md code Date: Fri, 6 Jul 2018 07:47:00 +0200 Message-Id: <20180706054713.722729881@linuxfoundation.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180706054712.332416244@linuxfoundation.org> References: <20180706054712.332416244@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: NeilBrown commit b3143b9a38d5039bcd1f2d1c94039651bfba8043 upstream. responding to ->suspend_lo and ->suspend_hi is similar to responding to ->suspended. It is best to wait in the common core code without incrementing ->active_io. This allows mddev_suspend()/mddev_resume() to work while requests are waiting for suspend_lo/hi to change. This is will be important after a subsequent patch which uses mddev_suspend() to synchronize updating for suspend_lo/hi. So move the code for testing suspend_lo/hi out of raid1.c and raid5.c, and place it in md.c Signed-off-by: NeilBrown Signed-off-by: Shaohua Li Signed-off-by: Jack Wang Signed-off-by: Greg Kroah-Hartman --- drivers/md/md.c | 29 +++++++++++++++++++++++------ drivers/md/raid1.c | 14 +++++--------- drivers/md/raid5.c | 22 ---------------------- 3 files changed, 28 insertions(+), 37 deletions(-) --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -266,16 +266,31 @@ static DEFINE_SPINLOCK(all_mddevs_lock); * call has finished, the bio has been linked into some internal structure * and so is visible to ->quiesce(), so we don't need the refcount any more. */ +static bool is_suspended(struct mddev *mddev, struct bio *bio) +{ + if (mddev->suspended) + return true; + if (bio_data_dir(bio) != WRITE) + return false; + if (mddev->suspend_lo >= mddev->suspend_hi) + return false; + if (bio->bi_iter.bi_sector >= mddev->suspend_hi) + return false; + if (bio_end_sector(bio) < mddev->suspend_lo) + return false; + return true; +} + void md_handle_request(struct mddev *mddev, struct bio *bio) { check_suspended: rcu_read_lock(); - if (mddev->suspended) { + if (is_suspended(mddev, bio)) { DEFINE_WAIT(__wait); for (;;) { prepare_to_wait(&mddev->sb_wait, &__wait, TASK_UNINTERRUPTIBLE); - if (!mddev->suspended) + if (!is_suspended(mddev, bio)) break; rcu_read_unlock(); schedule(); @@ -4849,10 +4864,11 @@ suspend_lo_store(struct mddev *mddev, co goto unlock; old = mddev->suspend_lo; mddev->suspend_lo = new; - if (new >= old) + if (new >= old) { /* Shrinking suspended region */ + wake_up(&mddev->sb_wait); mddev->pers->quiesce(mddev, 2); - else { + } else { /* Expanding suspended region - need to wait */ mddev->pers->quiesce(mddev, 1); mddev->pers->quiesce(mddev, 0); @@ -4892,10 +4908,11 @@ suspend_hi_store(struct mddev *mddev, co goto unlock; old = mddev->suspend_hi; mddev->suspend_hi = new; - if (new <= old) + if (new <= old) { /* Shrinking suspended region */ + wake_up(&mddev->sb_wait); mddev->pers->quiesce(mddev, 2); - else { + } else { /* Expanding suspended region - need to wait */ mddev->pers->quiesce(mddev, 1); mddev->pers->quiesce(mddev, 0); --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1298,11 +1298,9 @@ static void raid1_write_request(struct m */ - if ((bio_end_sector(bio) > mddev->suspend_lo && - bio->bi_iter.bi_sector < mddev->suspend_hi) || - (mddev_is_clustered(mddev) && + if (mddev_is_clustered(mddev) && md_cluster_ops->area_resyncing(mddev, WRITE, - bio->bi_iter.bi_sector, bio_end_sector(bio)))) { + bio->bi_iter.bi_sector, bio_end_sector(bio))) { /* * As the suspend_* range is controlled by userspace, we want @@ -1313,12 +1311,10 @@ static void raid1_write_request(struct m sigset_t full, old; prepare_to_wait(&conf->wait_barrier, &w, TASK_INTERRUPTIBLE); - if ((bio_end_sector(bio) <= mddev->suspend_lo || - bio->bi_iter.bi_sector >= mddev->suspend_hi) && - (!mddev_is_clustered(mddev) || - !md_cluster_ops->area_resyncing(mddev, WRITE, + if (!mddev_is_clustered(mddev) || + !md_cluster_ops->area_resyncing(mddev, WRITE, bio->bi_iter.bi_sector, - bio_end_sector(bio)))) + bio_end_sector(bio))) break; sigfillset(&full); sigprocmask(SIG_BLOCK, &full, &old); --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -5686,28 +5686,6 @@ static bool raid5_make_request(struct md goto retry; } - if (rw == WRITE && - logical_sector >= mddev->suspend_lo && - logical_sector < mddev->suspend_hi) { - raid5_release_stripe(sh); - /* As the suspend_* range is controlled by - * userspace, we want an interruptible - * wait. - */ - prepare_to_wait(&conf->wait_for_overlap, - &w, TASK_INTERRUPTIBLE); - if (logical_sector >= mddev->suspend_lo && - logical_sector < mddev->suspend_hi) { - sigset_t full, old; - sigfillset(&full); - sigprocmask(SIG_BLOCK, &full, &old); - schedule(); - sigprocmask(SIG_SETMASK, &old, NULL); - do_prepare = true; - } - goto retry; - } - if (test_bit(STRIPE_EXPANDING, &sh->state) || !add_stripe_bio(sh, bi, dd_idx, rw, previous)) { /* Stripe is busy expanding or