Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751333AbdFCWHs (ORCPT ); Sat, 3 Jun 2017 18:07:48 -0400 Received: from mail.linux-iscsi.org ([67.23.28.174]:49005 "EHLO linux-iscsi.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751229AbdFCWHJ (ORCPT ); Sat, 3 Jun 2017 18:07:09 -0400 From: "Nicholas A. Bellinger" To: target-devel Cc: linux-scsi , lkml , Nicholas Bellinger , Himanshu Madhani , Quinn Tran , Mike Christie , Hannes Reinecke , Christoph Hellwig Subject: [PATCH 1/3] target: Add support for TMR percpu reference counting Date: Sat, 3 Jun 2017 22:10:06 +0000 Message-Id: <1496527808-28789-2-git-send-email-nab@linux-iscsi.org> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1496527808-28789-1-git-send-email-nab@linux-iscsi.org> References: <1496527808-28789-1-git-send-email-nab@linux-iscsi.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3394 Lines: 96 From: Nicholas Bellinger This patch introduces TMR percpu reference counting using se_lun->lun_ref in transport_lookup_tmr_lun(), following how existing non TMR per se_lun reference counting works within transport_lookup_cmd_lun(). It also adds explicit transport_lun_remove_cmd() calls to drop the reference in the three tmr related locations that invoke transport_cmd_check_stop_to_fabric(); - target_tmr_work() during normal ->queue_tm_rsp() - target_complete_tmr_failure() during error ->queue_tm_rsp() - transport_generic_handle_tmr() during early failure Also, note the exception paths in transport_generic_free_cmd() and transport_cmd_finish_abort() already check SCF_SE_LUN_CMD, and will invoke transport_lun_remove_cmd() when necessary. Cc: Himanshu Madhani Cc: Quinn Tran Cc: Mike Christie Cc: Hannes Reinecke Cc: Christoph Hellwig Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_device.c | 14 ++++++++++---- drivers/target/target_core_transport.c | 3 +++ 2 files changed, 13 insertions(+), 4 deletions(-) diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index 8f0e0e3..11c80c4 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -168,11 +168,20 @@ int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun) rcu_read_lock(); deve = target_nacl_find_deve(nacl, unpacked_lun); if (deve) { - se_cmd->se_lun = rcu_dereference(deve->se_lun); se_lun = rcu_dereference(deve->se_lun); + + if (!percpu_ref_tryget_live(&se_lun->lun_ref)) { + se_lun = NULL; + goto out_unlock; + } + + se_cmd->se_lun = rcu_dereference(deve->se_lun); se_cmd->pr_res_key = deve->pr_res_key; se_cmd->orig_fe_lun = unpacked_lun; + se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; + se_cmd->lun_ref_active = true; } +out_unlock: rcu_read_unlock(); if (!se_lun) { @@ -182,9 +191,6 @@ int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun) unpacked_lun); return -ENODEV; } - /* - * XXX: Add percpu se_lun->lun_ref reference count for TMR - */ se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev); se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev); diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index f16a789..83bfc97 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -1588,6 +1588,7 @@ static void target_complete_tmr_failure(struct work_struct *work) se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; se_cmd->se_tfo->queue_tm_rsp(se_cmd); + transport_lun_remove_cmd(se_cmd); transport_cmd_check_stop_to_fabric(se_cmd); } @@ -3199,6 +3200,7 @@ static void target_tmr_work(struct work_struct *work) cmd->se_tfo->queue_tm_rsp(cmd); check_stop: + transport_lun_remove_cmd(cmd); transport_cmd_check_stop_to_fabric(cmd); } @@ -3221,6 +3223,7 @@ int transport_generic_handle_tmr( pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d" "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function, cmd->se_tmr_req->ref_task_tag, cmd->tag); + transport_lun_remove_cmd(cmd); transport_cmd_check_stop_to_fabric(cmd); return 0; } -- 1.9.1