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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT 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 05BEAC43381 for ; Mon, 18 Feb 2019 14:03:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C1C1121908 for ; Mon, 18 Feb 2019 14:03:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550498636; bh=/UTDyh4bxb+avqeHerWYgOLWfBPtnB2lxuQYeX2QYTY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=CRMWzRWuMAOw+100+DnbbxIneR2rHtrZs0UB4GGC8Xu+8rAz0FIkvyzE712f28BZD vDG0BvutIxoRfwALPEOy0MXvDatQLLGvZ7KcNZsS2JrswamPd1DX4d8d86R1iwYZVz xV5GCQusrerT9ETUhN5wdxtBw1i6QdvEhTnWo0kI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389804AbfBROD4 (ORCPT ); Mon, 18 Feb 2019 09:03:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:45828 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389747AbfBRODt (ORCPT ); Mon, 18 Feb 2019 09:03:49 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3BF5421901; Mon, 18 Feb 2019 14:03:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550498628; bh=/UTDyh4bxb+avqeHerWYgOLWfBPtnB2lxuQYeX2QYTY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SPcKMs8Zyhb9tAniukqVpPZs6IQHW6Z117k8sTwqSLVg5ZGzodq9ZdKJAY/N3r50E vUBwbWVOv6freiN7HOXIThpB5KVB0vP9sQrVjYZbW8anwPRkSA11av0yUGqEzyOvm9 4a1lye2WRXEeskbfd0+pgWqmCN7rDx2yTzYhtLvQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lars Ellenberg , Jens Axboe , Sasha Levin Subject: [PATCH 4.4 047/143] drbd: disconnect, if the wrong UUIDs are attached on a connected peer Date: Mon, 18 Feb 2019 14:42:55 +0100 Message-Id: <20190218133530.853979222@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190218133529.099444112@linuxfoundation.org> References: <20190218133529.099444112@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit b17b59602b6dcf8f97a7dc7bc489a48388d7063a ] With "on-no-data-accessible suspend-io", DRBD requires the next attach or connect to be to the very same data generation uuid tag it lost last. If we first lost connection to the peer, then later lost connection to our own disk, we would usually refuse to re-connect to the peer, because it presents the wrong data set. However, if the peer first connects without a disk, and then attached its disk, we accepted that same wrong data set, which would be "unexpected" by any user of that DRBD and cause "undefined results" (read: very likely data corruption). The fix is to forcefully disconnect as soon as we notice that the peer attached to the "wrong" dataset. Signed-off-by: Lars Ellenberg Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/block/drbd/drbd_receiver.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index 2fedab9349f6..b1ee358edd3b 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -3890,7 +3890,7 @@ static int receive_uuids(struct drbd_connection *connection, struct packet_info kfree(device->p_uuid); device->p_uuid = p_uuid; - if (device->state.conn < C_CONNECTED && + if ((device->state.conn < C_CONNECTED || device->state.pdsk == D_DISKLESS) && device->state.disk < D_INCONSISTENT && device->state.role == R_PRIMARY && (device->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { -- 2.19.1