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![Linus Torvalds](/assets/img/avatar_default.png)
Pull SCSI target updates from Nicholas Bellinger: "It's been a busy development cycle for target-core in a number of different areas. The fabric API usage for se_node_acl allocation is now within target-core code, dropping the external API callers for all fabric drivers tree-wide. There is a new conversion to RCU hlists for se_node_acl and se_portal_group LUN mappings, that turns fast-past LUN lookup into a completely lockless code-path. It also removes the original hard-coded limitation of 256 LUNs per fabric endpoint. The configfs attributes for backends can now be shared between core and driver code, allowing existing drivers to use common code while still allowing flexibility for new backend provided attributes. The highlights include: - Merge sbc_verify_dif_* into common code (sagi) - Remove iscsi-target support for obsolete IFMarker/OFMarker (Christophe Vu-Brugier) - Add bidi support in target/user backend (ilias + vangelis + agover) - Move se_node_acl allocation into target-core code (hch) - Add crc_t10dif_update common helper (akinobu + mkp) - Handle target-core odd SGL mapping for data transfer memory (akinobu) - Move transport ID handling into target-core (hch) - Move task tag into struct se_cmd + support 64-bit tags (bart) - Convert se_node_acl->device_list[] to RCU hlist (nab + hch + paulmck) - Convert se_portal_group->tpg_lun_list[] to RCU hlist (nab + hch + paulmck) - Simplify target backend driver registration (hch) - Consolidate + simplify target backend attribute implementations (hch + nab) - Subsume se_port + t10_alua_tg_pt_gp_member into se_lun (hch) - Drop lun_sep_lock for se_lun->lun_se_dev RCU usage (hch + nab) - Drop unnecessary core_tpg_register TFO parameter (nab) - Use 64-bit LUNs tree-wide (hannes) - Drop left-over TARGET_MAX_LUNS_PER_TRANSPORT limit (hannes)" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (76 commits) target: Bump core version to v5.0 target: remove target_core_configfs.h target: remove unused TARGET_CORE_CONFIG_ROOT define target: consolidate version defines target: implement WRITE_SAME with UNMAP bit using ->execute_unmap target: simplify UNMAP handling target: replace se_cmd->execute_rw with a protocol_data field target/user: Fix inconsistent kmap_atomic/kunmap_atomic target: Send UA when changing LUN inventory target: Send UA upon LUN RESET tmr completion target: Send UA on ALUA target port group change target: Convert se_lun->lun_deve_lock to normal spinlock target: use 'se_dev_entry' when allocating UAs target: Remove 'ua_nacl' pointer from se_ua structure target_core_alua: Correct UA handling when switching states xen-scsiback: Fix compile warning for 64-bit LUN target: Remove TARGET_MAX_LUNS_PER_TRANSPORT target: use 64-bit LUNs target: Drop duplicate + unused se_dev_check_wce target: Drop unnecessary core_tpg_register TFO parameter ...
387 lines
11 KiB
C
387 lines
11 KiB
C
/*******************************************************************************
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* Filename: target_core_tmr.c
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*
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* This file contains SPC-3 task management infrastructure
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*
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* (c) Copyright 2009-2013 Datera, Inc.
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*
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* Nicholas A. Bellinger <nab@kernel.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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******************************************************************************/
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/export.h>
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#include <target/target_core_base.h>
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#include <target/target_core_backend.h>
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#include <target/target_core_fabric.h>
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#include "target_core_internal.h"
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#include "target_core_alua.h"
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#include "target_core_pr.h"
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int core_tmr_alloc_req(
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struct se_cmd *se_cmd,
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void *fabric_tmr_ptr,
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u8 function,
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gfp_t gfp_flags)
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{
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struct se_tmr_req *tmr;
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tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags);
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if (!tmr) {
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pr_err("Unable to allocate struct se_tmr_req\n");
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return -ENOMEM;
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}
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se_cmd->se_cmd_flags |= SCF_SCSI_TMR_CDB;
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se_cmd->se_tmr_req = tmr;
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tmr->task_cmd = se_cmd;
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tmr->fabric_tmr_ptr = fabric_tmr_ptr;
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tmr->function = function;
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INIT_LIST_HEAD(&tmr->tmr_list);
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return 0;
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}
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EXPORT_SYMBOL(core_tmr_alloc_req);
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void core_tmr_release_req(struct se_tmr_req *tmr)
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{
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struct se_device *dev = tmr->tmr_dev;
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unsigned long flags;
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if (dev) {
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spin_lock_irqsave(&dev->se_tmr_lock, flags);
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list_del(&tmr->tmr_list);
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spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
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}
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kfree(tmr);
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}
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static void core_tmr_handle_tas_abort(
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struct se_node_acl *tmr_nacl,
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struct se_cmd *cmd,
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int tas)
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{
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bool remove = true;
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/*
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* TASK ABORTED status (TAS) bit support
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*/
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if ((tmr_nacl && (tmr_nacl != cmd->se_sess->se_node_acl)) && tas) {
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remove = false;
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transport_send_task_abort(cmd);
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}
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transport_cmd_finish_abort(cmd, remove);
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}
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static int target_check_cdb_and_preempt(struct list_head *list,
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struct se_cmd *cmd)
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{
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struct t10_pr_registration *reg;
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if (!list)
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return 0;
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list_for_each_entry(reg, list, pr_reg_abort_list) {
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if (reg->pr_res_key == cmd->pr_res_key)
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return 0;
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}
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return 1;
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}
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void core_tmr_abort_task(
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struct se_device *dev,
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struct se_tmr_req *tmr,
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struct se_session *se_sess)
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{
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struct se_cmd *se_cmd;
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unsigned long flags;
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u64 ref_tag;
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spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
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list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) {
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if (dev != se_cmd->se_dev)
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continue;
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/* skip task management functions, including tmr->task_cmd */
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if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
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continue;
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ref_tag = se_cmd->tag;
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if (tmr->ref_task_tag != ref_tag)
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continue;
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printk("ABORT_TASK: Found referenced %s task_tag: %llu\n",
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se_cmd->se_tfo->get_fabric_name(), ref_tag);
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spin_lock(&se_cmd->t_state_lock);
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if (se_cmd->transport_state & CMD_T_COMPLETE) {
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printk("ABORT_TASK: ref_tag: %llu already complete,"
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" skipping\n", ref_tag);
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spin_unlock(&se_cmd->t_state_lock);
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spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
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goto out;
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}
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se_cmd->transport_state |= CMD_T_ABORTED;
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spin_unlock(&se_cmd->t_state_lock);
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list_del_init(&se_cmd->se_cmd_list);
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kref_get(&se_cmd->cmd_kref);
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spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
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cancel_work_sync(&se_cmd->work);
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transport_wait_for_tasks(se_cmd);
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target_put_sess_cmd(se_cmd);
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transport_cmd_finish_abort(se_cmd, true);
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printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for"
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" ref_tag: %llu\n", ref_tag);
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tmr->response = TMR_FUNCTION_COMPLETE;
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return;
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}
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spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
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out:
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printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n",
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tmr->ref_task_tag);
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tmr->response = TMR_TASK_DOES_NOT_EXIST;
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}
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static void core_tmr_drain_tmr_list(
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struct se_device *dev,
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struct se_tmr_req *tmr,
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struct list_head *preempt_and_abort_list)
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{
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LIST_HEAD(drain_tmr_list);
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struct se_tmr_req *tmr_p, *tmr_pp;
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struct se_cmd *cmd;
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unsigned long flags;
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/*
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* Release all pending and outgoing TMRs aside from the received
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* LUN_RESET tmr..
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*/
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spin_lock_irqsave(&dev->se_tmr_lock, flags);
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list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
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/*
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* Allow the received TMR to return with FUNCTION_COMPLETE.
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*/
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if (tmr_p == tmr)
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continue;
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cmd = tmr_p->task_cmd;
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if (!cmd) {
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pr_err("Unable to locate struct se_cmd for TMR\n");
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continue;
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}
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/*
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* If this function was called with a valid pr_res_key
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* parameter (eg: for PROUT PREEMPT_AND_ABORT service action
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* skip non regisration key matching TMRs.
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*/
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if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
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continue;
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spin_lock(&cmd->t_state_lock);
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if (!(cmd->transport_state & CMD_T_ACTIVE)) {
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spin_unlock(&cmd->t_state_lock);
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continue;
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}
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if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
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spin_unlock(&cmd->t_state_lock);
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continue;
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}
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spin_unlock(&cmd->t_state_lock);
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list_move_tail(&tmr_p->tmr_list, &drain_tmr_list);
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}
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spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
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list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) {
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list_del_init(&tmr_p->tmr_list);
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cmd = tmr_p->task_cmd;
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pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
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" Response: 0x%02x, t_state: %d\n",
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(preempt_and_abort_list) ? "Preempt" : "", tmr_p,
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tmr_p->function, tmr_p->response, cmd->t_state);
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transport_cmd_finish_abort(cmd, 1);
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}
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}
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static void core_tmr_drain_state_list(
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struct se_device *dev,
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struct se_cmd *prout_cmd,
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struct se_node_acl *tmr_nacl,
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int tas,
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struct list_head *preempt_and_abort_list)
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{
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LIST_HEAD(drain_task_list);
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struct se_cmd *cmd, *next;
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unsigned long flags;
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/*
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* Complete outstanding commands with TASK_ABORTED SAM status.
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*
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* This is following sam4r17, section 5.6 Aborting commands, Table 38
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* for TMR LUN_RESET:
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*
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* a) "Yes" indicates that each command that is aborted on an I_T nexus
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* other than the one that caused the SCSI device condition is
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* completed with TASK ABORTED status, if the TAS bit is set to one in
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* the Control mode page (see SPC-4). "No" indicates that no status is
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* returned for aborted commands.
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*
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* d) If the logical unit reset is caused by a particular I_T nexus
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* (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
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* (TASK_ABORTED status) applies.
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*
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* Otherwise (e.g., if triggered by a hard reset), "no"
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* (no TASK_ABORTED SAM status) applies.
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*
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* Note that this seems to be independent of TAS (Task Aborted Status)
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* in the Control Mode Page.
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*/
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spin_lock_irqsave(&dev->execute_task_lock, flags);
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list_for_each_entry_safe(cmd, next, &dev->state_list, state_list) {
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/*
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* For PREEMPT_AND_ABORT usage, only process commands
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* with a matching reservation key.
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*/
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if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
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continue;
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/*
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* Not aborting PROUT PREEMPT_AND_ABORT CDB..
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*/
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if (prout_cmd == cmd)
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continue;
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list_move_tail(&cmd->state_list, &drain_task_list);
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cmd->state_active = false;
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}
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spin_unlock_irqrestore(&dev->execute_task_lock, flags);
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while (!list_empty(&drain_task_list)) {
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cmd = list_entry(drain_task_list.next, struct se_cmd, state_list);
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list_del(&cmd->state_list);
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pr_debug("LUN_RESET: %s cmd: %p"
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" ITT/CmdSN: 0x%08llx/0x%08x, i_state: %d, t_state: %d"
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"cdb: 0x%02x\n",
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(preempt_and_abort_list) ? "Preempt" : "", cmd,
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cmd->tag, 0,
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cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
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cmd->t_task_cdb[0]);
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pr_debug("LUN_RESET: ITT[0x%08llx] - pr_res_key: 0x%016Lx"
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" -- CMD_T_ACTIVE: %d"
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" CMD_T_STOP: %d CMD_T_SENT: %d\n",
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cmd->tag, cmd->pr_res_key,
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(cmd->transport_state & CMD_T_ACTIVE) != 0,
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(cmd->transport_state & CMD_T_STOP) != 0,
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(cmd->transport_state & CMD_T_SENT) != 0);
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/*
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* If the command may be queued onto a workqueue cancel it now.
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*
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* This is equivalent to removal from the execute queue in the
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* loop above, but we do it down here given that
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* cancel_work_sync may block.
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*/
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if (cmd->t_state == TRANSPORT_COMPLETE)
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cancel_work_sync(&cmd->work);
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spin_lock_irqsave(&cmd->t_state_lock, flags);
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target_stop_cmd(cmd, &flags);
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cmd->transport_state |= CMD_T_ABORTED;
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spin_unlock_irqrestore(&cmd->t_state_lock, flags);
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core_tmr_handle_tas_abort(tmr_nacl, cmd, tas);
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}
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}
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int core_tmr_lun_reset(
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struct se_device *dev,
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struct se_tmr_req *tmr,
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struct list_head *preempt_and_abort_list,
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struct se_cmd *prout_cmd)
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{
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struct se_node_acl *tmr_nacl = NULL;
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struct se_portal_group *tmr_tpg = NULL;
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int tas;
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/*
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* TASK_ABORTED status bit, this is configurable via ConfigFS
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* struct se_device attributes. spc4r17 section 7.4.6 Control mode page
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*
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* A task aborted status (TAS) bit set to zero specifies that aborted
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* tasks shall be terminated by the device server without any response
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* to the application client. A TAS bit set to one specifies that tasks
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* aborted by the actions of an I_T nexus other than the I_T nexus on
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* which the command was received shall be completed with TASK ABORTED
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* status (see SAM-4).
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*/
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tas = dev->dev_attrib.emulate_tas;
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/*
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* Determine if this se_tmr is coming from a $FABRIC_MOD
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* or struct se_device passthrough..
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*/
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if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
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tmr_nacl = tmr->task_cmd->se_sess->se_node_acl;
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tmr_tpg = tmr->task_cmd->se_sess->se_tpg;
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if (tmr_nacl && tmr_tpg) {
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pr_debug("LUN_RESET: TMR caller fabric: %s"
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" initiator port %s\n",
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tmr_tpg->se_tpg_tfo->get_fabric_name(),
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tmr_nacl->initiatorname);
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}
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}
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pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
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(preempt_and_abort_list) ? "Preempt" : "TMR",
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dev->transport->name, tas);
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core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list);
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core_tmr_drain_state_list(dev, prout_cmd, tmr_nacl, tas,
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preempt_and_abort_list);
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/*
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* Clear any legacy SPC-2 reservation when called during
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* LOGICAL UNIT RESET
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*/
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if (!preempt_and_abort_list &&
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(dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)) {
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spin_lock(&dev->dev_reservation_lock);
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dev->dev_reserved_node_acl = NULL;
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dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
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spin_unlock(&dev->dev_reservation_lock);
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pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
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}
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atomic_long_inc(&dev->num_resets);
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pr_debug("LUN_RESET: %s for [%s] Complete\n",
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(preempt_and_abort_list) ? "Preempt" : "TMR",
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dev->transport->name);
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return 0;
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}
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