From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:36526 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S968435AbeEXJ4l (ORCPT ); Thu, 24 May 2018 05:56:41 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jianchao Wang , Chris Leech , Lee Duncan , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 4.14 114/165] scsi: iscsi_tcp: set BDI_CAP_STABLE_WRITES when data digest enabled Date: Thu, 24 May 2018 11:38:40 +0200 Message-Id: <20180524093626.631443000@linuxfoundation.org> In-Reply-To: <20180524093621.979359379@linuxfoundation.org> References: <20180524093621.979359379@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jianchao Wang [ Upstream commit 89d0c804392bb962553f23dc4c119d11b6bd1675 ] iscsi tcp will first send out data, then calculate and send data digest. If we don't have BDI_CAP_STABLE_WRITES, the page cache will be written in spite of the on going writeback. Consequently, wrong digest will be got and sent to target. To fix this, set BDI_CAP_STABLE_WRITES when data digest is enabled in iscsi_tcp .slave_configure callback. Signed-off-by: Jianchao Wang Acked-by: Chris Leech Acked-by: Lee Duncan Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/scsi/iscsi_tcp.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -37,6 +37,7 @@ #include #include #include +#include #include #include #include @@ -952,6 +953,13 @@ static int iscsi_sw_tcp_slave_alloc(stru static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) { + struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host); + struct iscsi_session *session = tcp_sw_host->session; + struct iscsi_conn *conn = session->leadconn; + + if (conn->datadgst_en) + sdev->request_queue->backing_dev_info->capabilities + |= BDI_CAP_STABLE_WRITES; blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); blk_queue_dma_alignment(sdev->request_queue, 0); return 0;