From patchwork Fri Jun 11 20:25:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Wilck X-Patchwork-Id: 12316539 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=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 AD3ECC48BE0 for ; Fri, 11 Jun 2021 20:39:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 954D66128A for ; Fri, 11 Jun 2021 20:39:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230387AbhFKUlJ (ORCPT ); Fri, 11 Jun 2021 16:41:09 -0400 Received: from smtp-out2.suse.de ([195.135.220.29]:59410 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230392AbhFKUlI (ORCPT ); Fri, 11 Jun 2021 16:41:08 -0400 Received: from imap.suse.de (imap-alt.suse-dmz.suse.de [192.168.254.47]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 9DB921FD6D; Fri, 11 Jun 2021 20:39:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1623443949; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=ZQ2SQMwdANGbatiHgkjUZHqFpFcMpyifm6yWuH18a24=; b=baciI1dnUr5I/AvtRCNspDmKTZxhzngi2WQubtUHgmg+Ob5iAdV/3Fk70e/9qqKZ14rmh7 iiPhIRefxBxtYHZLXNDMStUH/vOWyg8OHrrcJRHGFXxZf21Vg/X22fEQs0iji7LC2qCwZD XAtyIo21rGlDFbM+dzckpwtDTJuThWE= Received: from imap3-int (imap-alt.suse-dmz.suse.de [192.168.254.47]) by imap.suse.de (Postfix) with ESMTP id 494C1118DD; Fri, 11 Jun 2021 20:39:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1623443949; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=ZQ2SQMwdANGbatiHgkjUZHqFpFcMpyifm6yWuH18a24=; b=baciI1dnUr5I/AvtRCNspDmKTZxhzngi2WQubtUHgmg+Ob5iAdV/3Fk70e/9qqKZ14rmh7 iiPhIRefxBxtYHZLXNDMStUH/vOWyg8OHrrcJRHGFXxZf21Vg/X22fEQs0iji7LC2qCwZD XAtyIo21rGlDFbM+dzckpwtDTJuThWE= Received: from director2.suse.de ([192.168.254.72]) by imap3-int with ESMTPSA id 7BwmEO3Jw2BGEgAALh3uQQ (envelope-from ); Fri, 11 Jun 2021 20:39:09 +0000 From: mwilck@suse.com To: Mike Snitzer , Alasdair G Kergon , Bart Van Assche , dm-devel@redhat.com, Hannes Reinecke Cc: Daniel Wagner , linux-block@vger.kernel.org, Paolo Bonzini , Christoph Hellwig , Benjamin Marzinski , Martin Wilck Subject: [PATCH v3 0/2] dm: dm_blk_ioctl(): implement failover for SG_IO on dm-multipath Date: Fri, 11 Jun 2021 22:25:07 +0200 Message-Id: <20210611202509.5426-1-mwilck@suse.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Martin Wilck Hello Mike, here is v3 of my attempt to add retry logic to SG_IO on dm-multipath devices. Sorry that it took such a long time. Regards Martin Changes v2->v3: - un-inlined scsi_result_to_blk_status again, and move the helper __scsi_result_to_blk_status to block/scsi_ioctl.c instead (Bart v. Assche) - open-coded the status/msg/host/driver-byte -> result conversion where the standard SCSI helpers aren't usable (Bart v. Assche) Changes v1->v2: - applied modifications from Mike Snitzer - moved SG_IO dependent code to a separate file, no scsi includes in dm.c any more - made the new code depend on a configuration option - separated out scsi changes, made scsi_result_to_blk_status() inline to avoid dependency of dm_mod from scsi_mod (Paolo Bonzini) Martin Wilck (2): scsi: export __scsi_result_to_blk_status() in scsi_ioctl.c dm: add CONFIG_DM_MULTIPATH_SG_IO - failover for SG_IO on dm-multipath block/scsi_ioctl.c | 52 ++++++++++++++- drivers/md/Kconfig | 11 ++++ drivers/md/Makefile | 4 ++ drivers/md/dm-core.h | 5 ++ drivers/md/dm-rq.h | 11 ++++ drivers/md/dm-scsi_ioctl.c | 127 +++++++++++++++++++++++++++++++++++++ drivers/md/dm.c | 20 +++++- drivers/scsi/scsi_lib.c | 29 +-------- include/linux/blkdev.h | 3 + 9 files changed, 229 insertions(+), 33 deletions(-) create mode 100644 drivers/md/dm-scsi_ioctl.c