From patchwork Wed Oct 25 16:47:15 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Christie X-Patchwork-Id: 10026987 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 94C4D60375 for ; Wed, 25 Oct 2017 16:47:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 85DD128BED for ; Wed, 25 Oct 2017 16:47:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7ABEA28BF1; Wed, 25 Oct 2017 16:47:45 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 17A6828BED for ; Wed, 25 Oct 2017 16:47:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751980AbdJYQro (ORCPT ); Wed, 25 Oct 2017 12:47:44 -0400 Received: from mx1.redhat.com ([209.132.183.28]:54236 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751958AbdJYQro (ORCPT ); Wed, 25 Oct 2017 12:47:44 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E8EF525C37; Wed, 25 Oct 2017 16:47:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com E8EF525C37 Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=mchristi@redhat.com Received: from rh2.redhat.com (ovpn-124-200.rdu2.redhat.com [10.10.124.200]) by smtp.corp.redhat.com (Postfix) with ESMTP id 58D986BF76; Wed, 25 Oct 2017 16:47:43 +0000 (UTC) From: Mike Christie To: target-devel@vger.kernel.org, nab@linux-iscsi.org Cc: Mike Christie Subject: [PATCH 05/20] tcmu: fix double se_cmd completion Date: Wed, 25 Oct 2017 11:47:15 -0500 Message-Id: <1508950050-10120-6-git-send-email-mchristi@redhat.com> In-Reply-To: <1508950050-10120-1-git-send-email-mchristi@redhat.com> References: <1508950050-10120-1-git-send-email-mchristi@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Wed, 25 Oct 2017 16:47:44 +0000 (UTC) Sender: target-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP If cmd_time_out != 0, then tcmu_queue_cmd_ring could end up sleeping waiting for ring space, timing out and then returning failure to lio, and tcmu_check_expired_cmd could also detect the timeout and call target_complete_cmd on the cmd. This patch just delays setting up the deadline value and adding the cmd to the udev->commands idr until we have allocated ring space and are about to send the cmd to userspace. Signed-off-by: Mike Christie --- drivers/target/target_core_user.c | 54 ++++++++++++++++++++++----------------- 1 file changed, 31 insertions(+), 23 deletions(-) diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 2a3ad19..38652be 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -459,7 +459,6 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) struct se_device *se_dev = se_cmd->se_dev; struct tcmu_dev *udev = TCMU_DEV(se_dev); struct tcmu_cmd *tcmu_cmd; - int cmd_id; tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); if (!tcmu_cmd) @@ -467,9 +466,6 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) tcmu_cmd->se_cmd = se_cmd; tcmu_cmd->tcmu_dev = udev; - if (udev->cmd_time_out) - tcmu_cmd->deadline = jiffies + - msecs_to_jiffies(udev->cmd_time_out); tcmu_cmd_reset_dbi_cur(tcmu_cmd); tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); @@ -480,19 +476,6 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) return NULL; } - idr_preload(GFP_KERNEL); - spin_lock_irq(&udev->commands_lock); - cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0, - USHRT_MAX, GFP_NOWAIT); - spin_unlock_irq(&udev->commands_lock); - idr_preload_end(); - - if (cmd_id < 0) { - tcmu_free_cmd(tcmu_cmd); - return NULL; - } - tcmu_cmd->cmd_id = cmd_id; - return tcmu_cmd; } @@ -795,6 +778,30 @@ static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, return command_size; } +static int tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd) +{ + struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; + unsigned long tmo = udev->cmd_time_out; + int cmd_id; + + if (tcmu_cmd->cmd_id) + return 0; + + cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT); + if (cmd_id < 0) { + pr_err("tcmu: Could not allocate cmd id.\n"); + return cmd_id; + } + tcmu_cmd->cmd_id = cmd_id; + + if (!tmo) + return 0; + + tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); + mod_timer(&udev->timeout, tcmu_cmd->deadline); + return 0; +} + static sense_reason_t tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) { @@ -902,7 +909,6 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) entry = (void *) mb + CMDR_OFF + cmd_head; memset(entry, 0, command_size); tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); - entry->hdr.cmd_id = tcmu_cmd->cmd_id; /* Handle allocating space from the data area */ tcmu_cmd_reset_dbi_cur(tcmu_cmd); @@ -940,6 +946,13 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) } entry->req.iov_bidi_cnt = iov_cnt; + ret = tcmu_setup_cmd_timer(tcmu_cmd); + if (ret) { + tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); + return TCM_OUT_OF_RESOURCES; + } + entry->hdr.cmd_id = tcmu_cmd->cmd_id; + /* * Recalaulate the command's base size and size according * to the actual needs @@ -973,8 +986,6 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) static sense_reason_t tcmu_queue_cmd(struct se_cmd *se_cmd) { - struct se_device *se_dev = se_cmd->se_dev; - struct tcmu_dev *udev = TCMU_DEV(se_dev); struct tcmu_cmd *tcmu_cmd; sense_reason_t ret; @@ -985,9 +996,6 @@ tcmu_queue_cmd(struct se_cmd *se_cmd) ret = tcmu_queue_cmd_ring(tcmu_cmd); if (ret != TCM_NO_SENSE) { pr_err("TCMU: Could not queue command\n"); - spin_lock_irq(&udev->commands_lock); - idr_remove(&udev->commands, tcmu_cmd->cmd_id); - spin_unlock_irq(&udev->commands_lock); tcmu_free_cmd(tcmu_cmd); }