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,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,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 E25C1C282C8 for ; Mon, 28 Jan 2019 16:35:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AAFD12084A for ; Mon, 28 Jan 2019 16:35:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548693350; bh=K+53OXBqfmYLglGWY/EjWaPSMW4nyKFKD7SDVtC97vY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=xLarpGfh5Thx/AMkfvydw6DpfJxucd+edUsEybpRjq7EOkOoeOkuXvwfZ3jY/cGgU keMPK7tvnB/3jcPmM+frnALmP1qgVhJlng8Zj65GNaVXvuYNaujLX/l8rNfvi5oseo FQ/bqhDSjX/yKncxUetPP1ZlK12jvJUZF6vb5iok= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388351AbfA1Qfo (ORCPT ); Mon, 28 Jan 2019 11:35:44 -0500 Received: from mail.kernel.org ([198.145.29.99]:34440 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389958AbfA1QZe (ORCPT ); Mon, 28 Jan 2019 11:25:34 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 101722084A; Mon, 28 Jan 2019 16:25:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548692733; bh=K+53OXBqfmYLglGWY/EjWaPSMW4nyKFKD7SDVtC97vY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AuBF/5fe5SiRkSaD9pPkoyBYLEwf+SCjZ1KnEx1y82j8AZ71BjNdooqM71qmY2aSL LGaYniLo+OXS3LxOPaRh3V+95gxL/nWizMR++X4F+iSRy4a+pT30tkY4GW4rd3fmQw SYPAwIVSNz8dMu2Ond1CLepRQrFvIDg2gjHMolwU= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Lars Ellenberg , Jens Axboe , Sasha Levin , drbd-dev@lists.linbit.com, linux-block@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 54/80] drbd: disconnect, if the wrong UUIDs are attached on a connected peer Date: Mon, 28 Jan 2019 11:23:35 -0500 Message-Id: <20190128162401.58841-54-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190128162401.58841-1-sashal@kernel.org> References: <20190128162401.58841-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Lars Ellenberg [ 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