From patchwork Wed Dec 14 07:08:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wenchao Hao X-Patchwork-Id: 13072827 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28BC0C4332F for ; Wed, 14 Dec 2022 07:09:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237266AbiLNHJY (ORCPT ); Wed, 14 Dec 2022 02:09:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47030 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237499AbiLNHJP (ORCPT ); Wed, 14 Dec 2022 02:09:15 -0500 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CF7D6C34; Tue, 13 Dec 2022 23:09:13 -0800 (PST) Received: from dggpemm500017.china.huawei.com (unknown [172.30.72.57]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4NX5zv2WLyzRq37; Wed, 14 Dec 2022 15:08:11 +0800 (CST) Received: from build.huawei.com (10.175.101.6) by dggpemm500017.china.huawei.com (7.185.36.178) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.34; Wed, 14 Dec 2022 15:09:11 +0800 From: Wenchao Hao To: "Martin K . Petersen" , Mike Christie , "James E . J . Bottomley" , Lee Duncan , Chris Leech , , CC: , , , Wenchao Hao Subject: [PATCH 0/2] scsi:donot skip lun if inquiry returns PQ=1 for all hosts Date: Wed, 14 Dec 2022 15:08:44 +0800 Message-ID: <20221214070846.1808300-1-haowenchao@huawei.com> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 X-Originating-IP: [10.175.101.6] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To dggpemm500017.china.huawei.com (7.185.36.178) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org commit 948e922fc4461 ("scsi: core: map PQ=1, PDT=other values to SCSI_SCAN_TARGET_PRESENT") returns SCSI_SCAN_TARGET_PRESENT if inquiry returns PQ=1. According to the SPC, PQ=1 means the addressed logical unit having the indicated device type is not accessible, it does not mean the addressed logical unit is invalid. We still can map this lun to an sg device. In some conditions, we do not want to skip these devices, for example with iSCSI: When iSCSI initiator logged in target, the target attached none valid lun but lun0. lun0 is not an valid disk, while it would response inquiry command with PQ=1 and other general scsi commands like probe lun. The others luns of target is added/removed dynamicly. We want the lun0 to be mapped to an sg device in initiator, so we can probe luns of target based on lun0. In first patch, I add an interface to control if to skip luns return PQ=1 for inquiry. In second patch, make iscsi_tcp do not skip luns return PQ=1 as default, since I do not have iscsi_tcp environment, so here just modified the iscsi_tcp. Wenchao Hao (2): scsi:core:Add sysfs interface to control if skip lun with PQ=1 scsi:iscsi_tcp:Do not skip lun inquiry returns PQ=1 drivers/scsi/iscsi_tcp.c | 1 + drivers/scsi/scsi_scan.c | 9 ++++++--- drivers/scsi/scsi_sysfs.c | 29 +++++++++++++++++++++++++++++ include/scsi/scsi_host.h | 3 +++ 4 files changed, 39 insertions(+), 3 deletions(-)