From patchwork Tue Mar 30 11:47:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Yan X-Patchwork-Id: 412154 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, 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 85264C433DB for ; Tue, 30 Mar 2021 11:40:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 536846195C for ; Tue, 30 Mar 2021 11:40:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231574AbhC3Ljo (ORCPT ); Tue, 30 Mar 2021 07:39:44 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:15105 "EHLO szxga04-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231749AbhC3Lje (ORCPT ); Tue, 30 Mar 2021 07:39:34 -0400 Received: from DGGEMS401-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4F8nVb2z7Mz19Jv9; Tue, 30 Mar 2021 19:37:27 +0800 (CST) Received: from huawei.com (10.175.127.227) by DGGEMS401-HUB.china.huawei.com (10.3.19.201) with Microsoft SMTP Server id 14.3.498.0; Tue, 30 Mar 2021 19:39:24 +0800 From: Jason Yan To: , , , Subject: [PATCH] scsi: consider status is not good for offline devices Date: Tue, 30 Mar 2021 19:47:27 +0800 Message-ID: <20210330114727.234467-1-yanaijie@huawei.com> X-Mailer: git-send-email 2.25.4 MIME-Version: 1.0 X-Originating-IP: [10.175.127.227] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org When the scsi device status is offline, mode sense command will return a result with only DID_NO_CONNECT set. Then in sd_read_write_protect_flag(), only status byte of the result is checked, we still consider the command returned good, and read sdkp->write_prot from the buffer. And because of bug [1], garbage data is copied to the buffer, the disk sometimes be set readonly. When the scsi device is set running again, users cannot write data to the disk. So return 0 in scsi_status_is_good() for offline devices to indicate that the command has failed. And move scsi_status_is_good() down after the definition of DID_NO_CONNECT so that we can compile fine. [1] https://patchwork.kernel.org/project/linux-block/patch/20210318122621.330010-1-yanaijie@huawei.com/ Signed-off-by: Jason Yan --- include/scsi/scsi.h | 54 +++++++++++++++++++++++---------------------- 1 file changed, 28 insertions(+), 26 deletions(-) diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h index e75cca25338a..d7bfbfde0ea5 100644 --- a/include/scsi/scsi.h +++ b/include/scsi/scsi.h @@ -30,32 +30,6 @@ enum scsi_timeouts { */ #define SCAN_WILD_CARD ~0 -/** scsi_status_is_good - check the status return. - * - * @status: the status passed up from the driver (including host and - * driver components) - * - * This returns true for known good conditions that may be treated as - * command completed normally - */ -static inline int scsi_status_is_good(int status) -{ - /* - * FIXME: bit0 is listed as reserved in SCSI-2, but is - * significant in SCSI-3. For now, we follow the SCSI-2 - * behaviour and ignore reserved bits. - */ - status &= 0xfe; - return ((status == SAM_STAT_GOOD) || - (status == SAM_STAT_CONDITION_MET) || - /* Next two "intermediate" statuses are obsolete in SAM-4 */ - (status == SAM_STAT_INTERMEDIATE) || - (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) || - /* FIXME: this is obsolete in SAM-3 */ - (status == SAM_STAT_COMMAND_TERMINATED)); -} - - /* * standard mode-select header prepended to all mode-select commands */ @@ -276,4 +250,32 @@ static inline int scsi_is_wlun(u64 lun) /* Used to obtain the PCI location of a device */ #define SCSI_IOCTL_GET_PCI 0x5387 +/** scsi_status_is_good - check the status return. + * + * @status: the status passed up from the driver (including host and + * driver components) + * + * This returns true for known good conditions that may be treated as + * command completed normally + */ +static inline int scsi_status_is_good(int status) +{ + if (host_byte(status) == DID_NO_CONNECT) + return 0; + + /* + * FIXME: bit0 is listed as reserved in SCSI-2, but is + * significant in SCSI-3. For now, we follow the SCSI-2 + * behaviour and ignore reserved bits. + */ + status &= 0xfe; + return ((status == SAM_STAT_GOOD) || + (status == SAM_STAT_CONDITION_MET) || + /* Next two "intermediate" statuses are obsolete in SAM-4 */ + (status == SAM_STAT_INTERMEDIATE) || + (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) || + /* FIXME: this is obsolete in SAM-3 */ + (status == SAM_STAT_COMMAND_TERMINATED)); +} + #endif /* _SCSI_SCSI_H */