From patchwork Tue Feb 20 15:30:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiao Ni X-Patchwork-Id: 13564152 X-Patchwork-Delegate: snitzer@redhat.com Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 5D0B2762C1 for ; Tue, 20 Feb 2024 15:31:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708443078; cv=none; b=sG1++OBf2nA49nbJ2RQnqd2ndCsnSUt4v1EITuaFyMMPa9fYOmwi8GJw/xsgRXwCtV085ONlFBvttG+vf+3tQGuugrQZIlni6d0lVBB2WSTsam79fZAQvEtupTgQU7dHoS53p6bb6JuloctxqKFn8xgQkDe6jc/GSWgzD0Hq4+w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708443078; c=relaxed/simple; bh=p3zF3ZqBApEKi6a/GhK0dmTJTW+SmZ/mHlGibr6LBm0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=kWs+XR0yJGgsZKjlcctoSES8cg+zDYx/MR34edzSXlNXKUHeJyhbsDwzHaU19yFD3rIFv0lGnaOYliUphIyd/KFRITqbEYd/+DpGLdYTTfC7KmqCzuD87AEHUXNUtDZEy69LY6EJsROhQijNotWxKKkLYC8ePSHg1C8V0b7c6BE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=aSFv+8ej; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="aSFv+8ej" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1708443076; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rR6JN4gU7y3tOWM/kqUBGRZmH6XeMtMRLTOjNJqe0CU=; b=aSFv+8ejj+LGygnPxqD8hJtMmwTLWYUC/lEWft3KVg298vVs0M/B4Atb8FYB4WSOXXDFLl HnOEF4L83iqntH5rX/EaUO2VLR4m1WR62UONYdkfZqKqa6lGM+6apsEbIM9LXzniin4mnM ME+gzk/7gSyzbl2E6T/t+pIjGUFfaQk= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-659-Zf9acdOYN5-RHJFAe6OEow-1; Tue, 20 Feb 2024 10:31:14 -0500 X-MC-Unique: Zf9acdOYN5-RHJFAe6OEow-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id F0B38185A786; Tue, 20 Feb 2024 15:31:13 +0000 (UTC) Received: from localhost.localdomain (unknown [10.72.120.2]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2C9C32022AAC; Tue, 20 Feb 2024 15:31:09 +0000 (UTC) From: Xiao Ni To: song@kernel.org Cc: yukuai1@huaweicloud.com, bmarzins@redhat.com, heinzm@redhat.com, snitzer@kernel.org, ncroxon@redhat.com, neilb@suse.de, linux-raid@vger.kernel.org, dm-devel@lists.linux.dev Subject: [PATCH RFC 2/4] md: Set MD_RECOVERY_FROZEN before stop sync thread Date: Tue, 20 Feb 2024 23:30:57 +0800 Message-Id: <20240220153059.11233-3-xni@redhat.com> In-Reply-To: <20240220153059.11233-1-xni@redhat.com> References: <20240220153059.11233-1-xni@redhat.com> Precedence: bulk X-Mailing-List: dm-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 After patch commit f52f5c71f3d4b ("md: fix stopping sync thread"), dmraid stops sync thread asynchronously. The calling process is: dev_remove->dm_destroy->__dm_destroy->raid_postsuspend->raid_dtr raid_postsuspend does two jobs. First, it stops sync thread. Then it suspend array. Now it can stop sync thread successfully. But it doesn't set MD_RECOVERY_FROZEN. It's introduced by patch f52f5c71f3d4b. So after raid_postsuspend, the sync thread starts again. raid_dtr can't stop the sync thread because the array is already suspended. This can be reproduced easily by those commands: while [ 1 ]; do vgcreate test_vg /dev/loop0 /dev/loop1 lvcreate --type raid1 -L 400M -m 1 -n test_lv test_vg lvchange -an test_vg vgremove test_vg -ff done Fixes: f52f5c71f3d4 ("md: fix stopping sync thread") Signed-off-by: Xiao Ni --- drivers/md/md.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/md/md.c b/drivers/md/md.c index 54790261254d..77e3af7cf6bb 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -6337,6 +6337,7 @@ static void __md_stop_writes(struct mddev *mddev) void md_stop_writes(struct mddev *mddev) { mddev_lock_nointr(mddev); + set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); __md_stop_writes(mddev); mddev_unlock(mddev); }