From patchwork Tue Jun 11 13:22:46 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu Kuai X-Patchwork-Id: 13693766 Received: from dggsgout12.his.huawei.com (dggsgout12.his.huawei.com [45.249.212.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 00ED617D341; Tue, 11 Jun 2024 13:23:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718112204; cv=none; b=qhNnTE3xUMr478NNLyaz/vrmqOlUPXaED4LipV7c6gd5II74/3xT/Gs6qjYaDOBCryCfBeP+hbZsr5EbSokYFy/KhGmAhxBpz8sTrrk5B5oMc50DsGjVSPggRpTAwd61YNPrDuTkYEwnSYenHPUHMpjUyVycsDbiBhy2j3MXYPc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718112204; c=relaxed/simple; bh=I8306fpRwsxgUr2q/hkh3ND4xyfvxTK2xeekp7AcPXE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=NzzIpK2dCEfzihZImTwofz+U3p0ozlJryUqmL44SZALoFmwZyi+s/xWDXhP54T5whFgMPXaYYc9/OMVf83bFJCYkuw5948A1uayOxLeRAX7+0k2J3KRR4dn5fWaRIvn9PeltuTPWMvbTY+06zhmfOETLaCX8DIADFKBJz4V8iHQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.235]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4Vz8W1318Yz4f3jrf; Tue, 11 Jun 2024 21:23:09 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.112]) by mail.maildlp.com (Postfix) with ESMTP id 618FE1A0568; Tue, 11 Jun 2024 21:23:19 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.104.67]) by APP1 (Coremail) with SMTP id cCh0CgDHlxDBT2hmsVPEPA--.1557S11; Tue, 11 Jun 2024 21:23:19 +0800 (CST) From: Yu Kuai To: agk@redhat.com, snitzer@kernel.org, mpatocka@redhat.com, song@kernel.org, xni@redhat.com, mariusz.tkaczyk@linux.intel.com Cc: dm-devel@lists.linux.dev, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, yukuai3@huawei.com, yukuai1@huaweicloud.com, yi.zhang@huawei.com, yangerkun@huawei.com Subject: [PATCH v2 md-6.11 07/12] md: don't fail action_store() if sync_thread is not registered Date: Tue, 11 Jun 2024 21:22:46 +0800 Message-Id: <20240611132251.1967786-8-yukuai1@huaweicloud.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240611132251.1967786-1-yukuai1@huaweicloud.com> References: <20240611132251.1967786-1-yukuai1@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: cCh0CgDHlxDBT2hmsVPEPA--.1557S11 X-Coremail-Antispam: 1UD129KBjvJXoW3Jw4fuFyUXrWxArWfAF45trb_yoW7Zrykpa yftF95Jr4UtrZ3Xry7t3WDuayY9w1IqFWDtrW7ua4xJ3Z2kr47KF1YvF17JFykta4rCr4U Xa1rJFW5ZFWj9F7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPI14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JF0E3s1l82xGYI kIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2 z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F 4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq 3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7 IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4U M4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628vn2 kIc2xKxwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E 14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIx kGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUCVW8JwCI42IY6xIIjxv20xvEc7CjxVAF wI0_Gr1j6F4UJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Gr 0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8Jr0_Cr1UYxBIdaVFxhVjvjDU0xZFpf9x0JUQ SdkUUUUU= X-CM-SenderInfo: 51xn3trlr6x35dzhxuhorxvhhfrp/ From: Yu Kuai MD_RECOVERY_RUNNING will always be set when trying to register a new sync_thread, however, if md_start_sync() turns out to do nothing, MD_RECOVERY_RUNNING will be cleared in this case. And during the race window, action_store() will return -EBUSY, which will cause some mdadm tests to fail. For example: The test 07reshape5intr will add a new disk to array, then start reshape: mdadm /dev/md0 --add /dev/xxx mdadm --grow /dev/md0 -n 3 And add_bound_rdev() from mdadm --add will set MD_RECOVERY_NEEDED, then during the race windown, mdadm --grow will fail. Fix the problem by waiting in action_store() during the race window, fail only if sync_thread is registered. Signed-off-by: Yu Kuai --- drivers/md/md.c | 85 +++++++++++++++++++------------------------------ drivers/md/md.h | 2 -- 2 files changed, 33 insertions(+), 54 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 44cb18ec1c52..86abd0fe0681 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -753,7 +753,6 @@ int mddev_init(struct mddev *mddev) mutex_init(&mddev->open_mutex); mutex_init(&mddev->reconfig_mutex); - mutex_init(&mddev->sync_mutex); mutex_init(&mddev->suspend_mutex); mutex_init(&mddev->bitmap_info.mutex); INIT_LIST_HEAD(&mddev->disks); @@ -5021,34 +5020,6 @@ void md_unfrozen_sync_thread(struct mddev *mddev) } EXPORT_SYMBOL_GPL(md_unfrozen_sync_thread); -static void idle_sync_thread(struct mddev *mddev) -{ - mutex_lock(&mddev->sync_mutex); - clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); - - if (mddev_lock(mddev)) { - mutex_unlock(&mddev->sync_mutex); - return; - } - - stop_sync_thread(mddev, false); - mutex_unlock(&mddev->sync_mutex); -} - -static void frozen_sync_thread(struct mddev *mddev) -{ - mutex_lock(&mddev->sync_mutex); - set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); - - if (mddev_lock(mddev)) { - mutex_unlock(&mddev->sync_mutex); - return; - } - - stop_sync_thread(mddev, false); - mutex_unlock(&mddev->sync_mutex); -} - static int mddev_start_reshape(struct mddev *mddev) { int ret; @@ -5056,24 +5027,13 @@ static int mddev_start_reshape(struct mddev *mddev) if (mddev->pers->start_reshape == NULL) return -EINVAL; - ret = mddev_lock(mddev); - if (ret) - return ret; - - if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { - mddev_unlock(mddev); - return -EBUSY; - } - if (mddev->reshape_position == MaxSector || mddev->pers->check_reshape == NULL || mddev->pers->check_reshape(mddev)) { clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); ret = mddev->pers->start_reshape(mddev); - if (ret) { - mddev_unlock(mddev); + if (ret) return ret; - } } else { /* * If reshape is still in progress, and md_check_recovery() can @@ -5083,7 +5043,6 @@ static int mddev_start_reshape(struct mddev *mddev) clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); } - mddev_unlock(mddev); sysfs_notify_dirent_safe(mddev->sysfs_degraded); return 0; } @@ -5097,36 +5056,53 @@ action_store(struct mddev *mddev, const char *page, size_t len) if (!mddev->pers || !mddev->pers->sync_request) return -EINVAL; +retry: + if (work_busy(&mddev->sync_work)) + flush_work(&mddev->sync_work); + + ret = mddev_lock(mddev); + if (ret) + return ret; + + if (work_busy(&mddev->sync_work)) { + mddev_unlock(mddev); + goto retry; + } + action = md_sync_action_by_name(page); /* TODO: mdadm rely on "idle" to start sync_thread. */ if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { switch (action) { case ACTION_FROZEN: - frozen_sync_thread(mddev); - return len; + md_frozen_sync_thread(mddev); + ret = len; + goto out; case ACTION_IDLE: - idle_sync_thread(mddev); + md_idle_sync_thread(mddev); break; case ACTION_RESHAPE: case ACTION_RECOVER: case ACTION_CHECK: case ACTION_REPAIR: case ACTION_RESYNC: - return -EBUSY; + ret = -EBUSY; + goto out; default: - return -EINVAL; + ret = -EINVAL; + goto out; } } else { switch (action) { case ACTION_FROZEN: set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); - return len; + ret = len; + goto out; case ACTION_RESHAPE: clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); ret = mddev_start_reshape(mddev); if (ret) - return ret; + goto out; break; case ACTION_RECOVER: clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); @@ -5144,7 +5120,8 @@ action_store(struct mddev *mddev, const char *page, size_t len) clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); break; default: - return -EINVAL; + ret = -EINVAL; + goto out; } } @@ -5152,14 +5129,18 @@ action_store(struct mddev *mddev, const char *page, size_t len) /* A write to sync_action is enough to justify * canceling read-auto mode */ - flush_work(&mddev->sync_work); mddev->ro = MD_RDWR; md_wakeup_thread(mddev->sync_thread); } + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); md_wakeup_thread(mddev->thread); sysfs_notify_dirent_safe(mddev->sysfs_action); - return len; + ret = len; + +out: + mddev_unlock(mddev); + return ret; } static struct md_sysfs_entry md_scan_mode = diff --git a/drivers/md/md.h b/drivers/md/md.h index 88add162b08e..732053b905b2 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -595,8 +595,6 @@ struct mddev { */ struct list_head deleting; - /* Used to synchronize idle and frozen for action_store() */ - struct mutex sync_mutex; /* The sequence number for sync thread */ atomic_t sync_seq;