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=-9.0 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,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 874B4C169C4 for ; Mon, 11 Feb 2019 14:31:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 58E99222A1 for ; Mon, 11 Feb 2019 14:31:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549895509; bh=zLHrc2OzcgeA1w0N76dq/vN6TewAHJFZk5jmeVT6vCg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ie8MbYU20xwrwxCbjpKVTI3pKOPOBU5ACzgb9REbn7miMngExhZ7nU+++EkYcK8uC sBrntTVknk4me5jNGQs6BtdHZCOwWGKMiGmThObLQqe7TYnETuhWdrbbhBLogKXW2N lzC/l9B0S7ttJOcQIW46StTb8jW3QDqlgnGiTbFI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729957AbfBKObr (ORCPT ); Mon, 11 Feb 2019 09:31:47 -0500 Received: from mail.kernel.org ([198.145.29.99]:38728 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730346AbfBKObl (ORCPT ); Mon, 11 Feb 2019 09:31:41 -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 8654520844; Mon, 11 Feb 2019 14:31:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549895501; bh=zLHrc2OzcgeA1w0N76dq/vN6TewAHJFZk5jmeVT6vCg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VPOgZuit918HOSqEPFkU/jlO6OIb96oMnVn542QjEad7CtUkMmCQlUvGM3K3u475v HpuCTZWe0s9obE1p4RoJLQ4pMXi55ta+PhpwbstGAod1mJ5ZuKMPX8NugyoMvPR10G wWdrP0vQPelZCTfxragC3yIa9KIsWmDuyjtoTFGA= 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 4.20 226/352] drbd: disconnect, if the wrong UUIDs are attached on a connected peer Date: Mon, 11 Feb 2019 15:17:33 +0100 Message-Id: <20190211141901.611942537@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211141846.543045703@linuxfoundation.org> References: <20190211141846.543045703@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 4.20-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 1b9822f264d2..e3da52b524d3 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -4143,7 +4143,7 @@ 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