mirror of
https://github.com/edk2-porting/linux-next.git
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a2b5d6f975
Fix two bugs in the LUN refcounting: 1. For the TCM_WRITE_PROTECTED case we were returning an error after taking a ref to the LUN, but never dropping it (caller just send status and drops cmd ref). 2. We still need to do a percpu_ref_tryget_live for the virt LUN 0 like we do for other LUNs, because the TPG code does the refcount/wait process like it does with other LUNs. Link: https://lore.kernel.org/r/1604257174-4524-2-git-send-email-michael.christie@oracle.com Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com> Signed-off-by: Mike Christie <michael.christie@oracle.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
1164 lines
30 KiB
C
1164 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*******************************************************************************
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* Filename: target_core_device.c (based on iscsi_target_device.c)
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*
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* This file contains the TCM Virtual Device and Disk Transport
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* agnostic related functions.
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*
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* (c) Copyright 2003-2013 Datera, Inc.
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*
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* Nicholas A. Bellinger <nab@kernel.org>
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*
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******************************************************************************/
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#include <linux/net.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/timer.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/kthread.h>
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#include <linux/in.h>
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#include <linux/export.h>
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#include <linux/t10-pi.h>
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#include <asm/unaligned.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#include <scsi/scsi_common.h>
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#include <scsi/scsi_proto.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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#include "target_core_ua.h"
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static DEFINE_MUTEX(device_mutex);
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static LIST_HEAD(device_list);
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static DEFINE_IDR(devices_idr);
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static struct se_hba *lun0_hba;
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/* not static, needed by tpg.c */
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struct se_device *g_lun0_dev;
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sense_reason_t
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transport_lookup_cmd_lun(struct se_cmd *se_cmd)
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{
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struct se_lun *se_lun = NULL;
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struct se_session *se_sess = se_cmd->se_sess;
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struct se_node_acl *nacl = se_sess->se_node_acl;
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struct se_dev_entry *deve;
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sense_reason_t ret = TCM_NO_SENSE;
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rcu_read_lock();
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deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
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if (deve) {
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atomic_long_inc(&deve->total_cmds);
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if (se_cmd->data_direction == DMA_TO_DEVICE)
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atomic_long_add(se_cmd->data_length,
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&deve->write_bytes);
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else if (se_cmd->data_direction == DMA_FROM_DEVICE)
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atomic_long_add(se_cmd->data_length,
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&deve->read_bytes);
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if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
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deve->lun_access_ro) {
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pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
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" Access for 0x%08llx\n",
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se_cmd->se_tfo->fabric_name,
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se_cmd->orig_fe_lun);
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rcu_read_unlock();
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return TCM_WRITE_PROTECTED;
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}
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se_lun = rcu_dereference(deve->se_lun);
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if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
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se_lun = NULL;
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goto out_unlock;
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}
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se_cmd->se_lun = se_lun;
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se_cmd->pr_res_key = deve->pr_res_key;
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se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
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se_cmd->lun_ref_active = true;
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}
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out_unlock:
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rcu_read_unlock();
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if (!se_lun) {
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/*
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* Use the se_portal_group->tpg_virt_lun0 to allow for
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* REPORT_LUNS, et al to be returned when no active
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* MappedLUN=0 exists for this Initiator Port.
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*/
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if (se_cmd->orig_fe_lun != 0) {
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pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
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" Access for 0x%08llx from %s\n",
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se_cmd->se_tfo->fabric_name,
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se_cmd->orig_fe_lun,
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nacl->initiatorname);
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return TCM_NON_EXISTENT_LUN;
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}
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/*
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* Force WRITE PROTECT for virtual LUN 0
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*/
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if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
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(se_cmd->data_direction != DMA_NONE))
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return TCM_WRITE_PROTECTED;
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se_lun = se_sess->se_tpg->tpg_virt_lun0;
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if (!percpu_ref_tryget_live(&se_lun->lun_ref))
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return TCM_NON_EXISTENT_LUN;
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se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
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se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
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se_cmd->lun_ref_active = true;
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}
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/*
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* RCU reference protected by percpu se_lun->lun_ref taken above that
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* must drop to zero (including initial reference) before this se_lun
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* pointer can be kfree_rcu() by the final se_lun->lun_group put via
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* target_core_fabric_configfs.c:target_fabric_port_release
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*/
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se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
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atomic_long_inc(&se_cmd->se_dev->num_cmds);
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if (se_cmd->data_direction == DMA_TO_DEVICE)
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atomic_long_add(se_cmd->data_length,
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&se_cmd->se_dev->write_bytes);
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else if (se_cmd->data_direction == DMA_FROM_DEVICE)
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atomic_long_add(se_cmd->data_length,
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&se_cmd->se_dev->read_bytes);
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return ret;
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}
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EXPORT_SYMBOL(transport_lookup_cmd_lun);
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int transport_lookup_tmr_lun(struct se_cmd *se_cmd)
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{
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struct se_dev_entry *deve;
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struct se_lun *se_lun = NULL;
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struct se_session *se_sess = se_cmd->se_sess;
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struct se_node_acl *nacl = se_sess->se_node_acl;
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struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
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unsigned long flags;
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rcu_read_lock();
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deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun);
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if (deve) {
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se_lun = rcu_dereference(deve->se_lun);
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if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
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se_lun = NULL;
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goto out_unlock;
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}
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se_cmd->se_lun = se_lun;
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se_cmd->pr_res_key = deve->pr_res_key;
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se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
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se_cmd->lun_ref_active = true;
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}
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out_unlock:
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rcu_read_unlock();
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if (!se_lun) {
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pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
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" Access for 0x%08llx for %s\n",
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se_cmd->se_tfo->fabric_name,
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se_cmd->orig_fe_lun,
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nacl->initiatorname);
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return -ENODEV;
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}
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se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
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se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
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spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
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list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
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spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(transport_lookup_tmr_lun);
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bool target_lun_is_rdonly(struct se_cmd *cmd)
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{
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struct se_session *se_sess = cmd->se_sess;
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struct se_dev_entry *deve;
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bool ret;
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rcu_read_lock();
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deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
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ret = deve && deve->lun_access_ro;
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rcu_read_unlock();
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return ret;
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}
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EXPORT_SYMBOL(target_lun_is_rdonly);
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/*
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* This function is called from core_scsi3_emulate_pro_register_and_move()
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* and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
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* when a matching rtpi is found.
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*/
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struct se_dev_entry *core_get_se_deve_from_rtpi(
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struct se_node_acl *nacl,
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u16 rtpi)
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{
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struct se_dev_entry *deve;
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struct se_lun *lun;
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struct se_portal_group *tpg = nacl->se_tpg;
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rcu_read_lock();
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hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
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lun = rcu_dereference(deve->se_lun);
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if (!lun) {
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pr_err("%s device entries device pointer is"
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" NULL, but Initiator has access.\n",
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tpg->se_tpg_tfo->fabric_name);
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continue;
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}
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if (lun->lun_rtpi != rtpi)
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continue;
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kref_get(&deve->pr_kref);
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rcu_read_unlock();
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return deve;
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}
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rcu_read_unlock();
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return NULL;
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}
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void core_free_device_list_for_node(
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struct se_node_acl *nacl,
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struct se_portal_group *tpg)
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{
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struct se_dev_entry *deve;
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mutex_lock(&nacl->lun_entry_mutex);
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hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
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struct se_lun *lun = rcu_dereference_check(deve->se_lun,
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lockdep_is_held(&nacl->lun_entry_mutex));
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core_disable_device_list_for_node(lun, deve, nacl, tpg);
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}
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mutex_unlock(&nacl->lun_entry_mutex);
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}
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void core_update_device_list_access(
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u64 mapped_lun,
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bool lun_access_ro,
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struct se_node_acl *nacl)
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{
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struct se_dev_entry *deve;
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mutex_lock(&nacl->lun_entry_mutex);
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deve = target_nacl_find_deve(nacl, mapped_lun);
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if (deve)
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deve->lun_access_ro = lun_access_ro;
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mutex_unlock(&nacl->lun_entry_mutex);
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}
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/*
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* Called with rcu_read_lock or nacl->device_list_lock held.
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*/
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struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
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{
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struct se_dev_entry *deve;
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hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
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if (deve->mapped_lun == mapped_lun)
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return deve;
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return NULL;
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}
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EXPORT_SYMBOL(target_nacl_find_deve);
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void target_pr_kref_release(struct kref *kref)
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{
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struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
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pr_kref);
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complete(&deve->pr_comp);
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}
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static void
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target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
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bool skip_new)
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{
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struct se_dev_entry *tmp;
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rcu_read_lock();
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hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
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if (skip_new && tmp == new)
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continue;
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core_scsi3_ua_allocate(tmp, 0x3F,
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ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
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}
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rcu_read_unlock();
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}
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int core_enable_device_list_for_node(
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struct se_lun *lun,
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struct se_lun_acl *lun_acl,
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u64 mapped_lun,
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bool lun_access_ro,
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struct se_node_acl *nacl,
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struct se_portal_group *tpg)
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{
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struct se_dev_entry *orig, *new;
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new = kzalloc(sizeof(*new), GFP_KERNEL);
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if (!new) {
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pr_err("Unable to allocate se_dev_entry memory\n");
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return -ENOMEM;
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}
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spin_lock_init(&new->ua_lock);
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INIT_LIST_HEAD(&new->ua_list);
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INIT_LIST_HEAD(&new->lun_link);
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new->mapped_lun = mapped_lun;
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kref_init(&new->pr_kref);
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init_completion(&new->pr_comp);
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new->lun_access_ro = lun_access_ro;
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new->creation_time = get_jiffies_64();
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new->attach_count++;
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mutex_lock(&nacl->lun_entry_mutex);
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orig = target_nacl_find_deve(nacl, mapped_lun);
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if (orig && orig->se_lun) {
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struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
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lockdep_is_held(&nacl->lun_entry_mutex));
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if (orig_lun != lun) {
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pr_err("Existing orig->se_lun doesn't match new lun"
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" for dynamic -> explicit NodeACL conversion:"
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" %s\n", nacl->initiatorname);
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mutex_unlock(&nacl->lun_entry_mutex);
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kfree(new);
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return -EINVAL;
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}
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if (orig->se_lun_acl != NULL) {
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pr_warn_ratelimited("Detected existing explicit"
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" se_lun_acl->se_lun_group reference for %s"
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" mapped_lun: %llu, failing\n",
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nacl->initiatorname, mapped_lun);
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mutex_unlock(&nacl->lun_entry_mutex);
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kfree(new);
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return -EINVAL;
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}
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rcu_assign_pointer(new->se_lun, lun);
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rcu_assign_pointer(new->se_lun_acl, lun_acl);
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hlist_del_rcu(&orig->link);
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hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
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mutex_unlock(&nacl->lun_entry_mutex);
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spin_lock(&lun->lun_deve_lock);
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list_del(&orig->lun_link);
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list_add_tail(&new->lun_link, &lun->lun_deve_list);
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spin_unlock(&lun->lun_deve_lock);
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kref_put(&orig->pr_kref, target_pr_kref_release);
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wait_for_completion(&orig->pr_comp);
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target_luns_data_has_changed(nacl, new, true);
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kfree_rcu(orig, rcu_head);
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return 0;
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}
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rcu_assign_pointer(new->se_lun, lun);
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rcu_assign_pointer(new->se_lun_acl, lun_acl);
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hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
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mutex_unlock(&nacl->lun_entry_mutex);
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spin_lock(&lun->lun_deve_lock);
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list_add_tail(&new->lun_link, &lun->lun_deve_list);
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spin_unlock(&lun->lun_deve_lock);
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target_luns_data_has_changed(nacl, new, true);
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return 0;
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}
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void core_disable_device_list_for_node(
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struct se_lun *lun,
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struct se_dev_entry *orig,
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struct se_node_acl *nacl,
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struct se_portal_group *tpg)
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{
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/*
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* rcu_dereference_raw protected by se_lun->lun_group symlink
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* reference to se_device->dev_group.
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*/
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struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
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lockdep_assert_held(&nacl->lun_entry_mutex);
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/*
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* If the MappedLUN entry is being disabled, the entry in
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* lun->lun_deve_list must be removed now before clearing the
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* struct se_dev_entry pointers below as logic in
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* core_alua_do_transition_tg_pt() depends on these being present.
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*
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* deve->se_lun_acl will be NULL for demo-mode created LUNs
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* that have not been explicitly converted to MappedLUNs ->
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* struct se_lun_acl, but we remove deve->lun_link from
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* lun->lun_deve_list. This also means that active UAs and
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* NodeACL context specific PR metadata for demo-mode
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* MappedLUN *deve will be released below..
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*/
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spin_lock(&lun->lun_deve_lock);
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list_del(&orig->lun_link);
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spin_unlock(&lun->lun_deve_lock);
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/*
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* Disable struct se_dev_entry LUN ACL mapping
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*/
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core_scsi3_ua_release_all(orig);
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hlist_del_rcu(&orig->link);
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clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
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orig->lun_access_ro = false;
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orig->creation_time = 0;
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orig->attach_count--;
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/*
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* Before firing off RCU callback, wait for any in process SPEC_I_PT=1
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* or REGISTER_AND_MOVE PR operation to complete.
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*/
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kref_put(&orig->pr_kref, target_pr_kref_release);
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wait_for_completion(&orig->pr_comp);
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rcu_assign_pointer(orig->se_lun, NULL);
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rcu_assign_pointer(orig->se_lun_acl, NULL);
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kfree_rcu(orig, rcu_head);
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core_scsi3_free_pr_reg_from_nacl(dev, nacl);
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target_luns_data_has_changed(nacl, NULL, false);
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}
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/* core_clear_lun_from_tpg():
|
|
*
|
|
*
|
|
*/
|
|
void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
|
|
{
|
|
struct se_node_acl *nacl;
|
|
struct se_dev_entry *deve;
|
|
|
|
mutex_lock(&tpg->acl_node_mutex);
|
|
list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
|
|
|
|
mutex_lock(&nacl->lun_entry_mutex);
|
|
hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
|
|
struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
|
|
lockdep_is_held(&nacl->lun_entry_mutex));
|
|
|
|
if (lun != tmp_lun)
|
|
continue;
|
|
|
|
core_disable_device_list_for_node(lun, deve, nacl, tpg);
|
|
}
|
|
mutex_unlock(&nacl->lun_entry_mutex);
|
|
}
|
|
mutex_unlock(&tpg->acl_node_mutex);
|
|
}
|
|
|
|
int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
|
|
{
|
|
struct se_lun *tmp;
|
|
|
|
spin_lock(&dev->se_port_lock);
|
|
if (dev->export_count == 0x0000ffff) {
|
|
pr_warn("Reached dev->dev_port_count =="
|
|
" 0x0000ffff\n");
|
|
spin_unlock(&dev->se_port_lock);
|
|
return -ENOSPC;
|
|
}
|
|
again:
|
|
/*
|
|
* Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
|
|
* Here is the table from spc4r17 section 7.7.3.8.
|
|
*
|
|
* Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
|
|
*
|
|
* Code Description
|
|
* 0h Reserved
|
|
* 1h Relative port 1, historically known as port A
|
|
* 2h Relative port 2, historically known as port B
|
|
* 3h to FFFFh Relative port 3 through 65 535
|
|
*/
|
|
lun->lun_rtpi = dev->dev_rpti_counter++;
|
|
if (!lun->lun_rtpi)
|
|
goto again;
|
|
|
|
list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
|
|
/*
|
|
* Make sure RELATIVE TARGET PORT IDENTIFIER is unique
|
|
* for 16-bit wrap..
|
|
*/
|
|
if (lun->lun_rtpi == tmp->lun_rtpi)
|
|
goto again;
|
|
}
|
|
spin_unlock(&dev->se_port_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void se_release_vpd_for_dev(struct se_device *dev)
|
|
{
|
|
struct t10_vpd *vpd, *vpd_tmp;
|
|
|
|
spin_lock(&dev->t10_wwn.t10_vpd_lock);
|
|
list_for_each_entry_safe(vpd, vpd_tmp,
|
|
&dev->t10_wwn.t10_vpd_list, vpd_list) {
|
|
list_del(&vpd->vpd_list);
|
|
kfree(vpd);
|
|
}
|
|
spin_unlock(&dev->t10_wwn.t10_vpd_lock);
|
|
}
|
|
|
|
static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
|
|
{
|
|
u32 aligned_max_sectors;
|
|
u32 alignment;
|
|
/*
|
|
* Limit max_sectors to a PAGE_SIZE aligned value for modern
|
|
* transport_allocate_data_tasks() operation.
|
|
*/
|
|
alignment = max(1ul, PAGE_SIZE / block_size);
|
|
aligned_max_sectors = rounddown(max_sectors, alignment);
|
|
|
|
if (max_sectors != aligned_max_sectors)
|
|
pr_info("Rounding down aligned max_sectors from %u to %u\n",
|
|
max_sectors, aligned_max_sectors);
|
|
|
|
return aligned_max_sectors;
|
|
}
|
|
|
|
int core_dev_add_lun(
|
|
struct se_portal_group *tpg,
|
|
struct se_device *dev,
|
|
struct se_lun *lun)
|
|
{
|
|
int rc;
|
|
|
|
rc = core_tpg_add_lun(tpg, lun, false, dev);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
|
|
" CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name,
|
|
tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
|
|
tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id);
|
|
/*
|
|
* Update LUN maps for dynamically added initiators when
|
|
* generate_node_acl is enabled.
|
|
*/
|
|
if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
|
|
struct se_node_acl *acl;
|
|
|
|
mutex_lock(&tpg->acl_node_mutex);
|
|
list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
|
|
if (acl->dynamic_node_acl &&
|
|
(!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
|
|
!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
|
|
core_tpg_add_node_to_devs(acl, tpg, lun);
|
|
}
|
|
}
|
|
mutex_unlock(&tpg->acl_node_mutex);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* core_dev_del_lun():
|
|
*
|
|
*
|
|
*/
|
|
void core_dev_del_lun(
|
|
struct se_portal_group *tpg,
|
|
struct se_lun *lun)
|
|
{
|
|
pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
|
|
" device object\n", tpg->se_tpg_tfo->fabric_name,
|
|
tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
|
|
tpg->se_tpg_tfo->fabric_name);
|
|
|
|
core_tpg_remove_lun(tpg, lun);
|
|
}
|
|
|
|
struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
|
|
struct se_portal_group *tpg,
|
|
struct se_node_acl *nacl,
|
|
u64 mapped_lun,
|
|
int *ret)
|
|
{
|
|
struct se_lun_acl *lacl;
|
|
|
|
if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
|
|
pr_err("%s InitiatorName exceeds maximum size.\n",
|
|
tpg->se_tpg_tfo->fabric_name);
|
|
*ret = -EOVERFLOW;
|
|
return NULL;
|
|
}
|
|
lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
|
|
if (!lacl) {
|
|
pr_err("Unable to allocate memory for struct se_lun_acl.\n");
|
|
*ret = -ENOMEM;
|
|
return NULL;
|
|
}
|
|
|
|
lacl->mapped_lun = mapped_lun;
|
|
lacl->se_lun_nacl = nacl;
|
|
|
|
return lacl;
|
|
}
|
|
|
|
int core_dev_add_initiator_node_lun_acl(
|
|
struct se_portal_group *tpg,
|
|
struct se_lun_acl *lacl,
|
|
struct se_lun *lun,
|
|
bool lun_access_ro)
|
|
{
|
|
struct se_node_acl *nacl = lacl->se_lun_nacl;
|
|
/*
|
|
* rcu_dereference_raw protected by se_lun->lun_group symlink
|
|
* reference to se_device->dev_group.
|
|
*/
|
|
struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
|
|
|
|
if (!nacl)
|
|
return -EINVAL;
|
|
|
|
if (lun->lun_access_ro)
|
|
lun_access_ro = true;
|
|
|
|
lacl->se_lun = lun;
|
|
|
|
if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
|
|
lun_access_ro, nacl, tpg) < 0)
|
|
return -EINVAL;
|
|
|
|
pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
|
|
" InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name,
|
|
tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
|
|
lun_access_ro ? "RO" : "RW",
|
|
nacl->initiatorname);
|
|
/*
|
|
* Check to see if there are any existing persistent reservation APTPL
|
|
* pre-registrations that need to be enabled for this LUN ACL..
|
|
*/
|
|
core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
|
|
lacl->mapped_lun);
|
|
return 0;
|
|
}
|
|
|
|
int core_dev_del_initiator_node_lun_acl(
|
|
struct se_lun *lun,
|
|
struct se_lun_acl *lacl)
|
|
{
|
|
struct se_portal_group *tpg = lun->lun_tpg;
|
|
struct se_node_acl *nacl;
|
|
struct se_dev_entry *deve;
|
|
|
|
nacl = lacl->se_lun_nacl;
|
|
if (!nacl)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&nacl->lun_entry_mutex);
|
|
deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
|
|
if (deve)
|
|
core_disable_device_list_for_node(lun, deve, nacl, tpg);
|
|
mutex_unlock(&nacl->lun_entry_mutex);
|
|
|
|
pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
|
|
" InitiatorNode: %s Mapped LUN: %llu\n",
|
|
tpg->se_tpg_tfo->fabric_name,
|
|
tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
|
|
nacl->initiatorname, lacl->mapped_lun);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void core_dev_free_initiator_node_lun_acl(
|
|
struct se_portal_group *tpg,
|
|
struct se_lun_acl *lacl)
|
|
{
|
|
pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
|
|
" Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name,
|
|
tpg->se_tpg_tfo->tpg_get_tag(tpg),
|
|
tpg->se_tpg_tfo->fabric_name,
|
|
lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
|
|
|
|
kfree(lacl);
|
|
}
|
|
|
|
static void scsi_dump_inquiry(struct se_device *dev)
|
|
{
|
|
struct t10_wwn *wwn = &dev->t10_wwn;
|
|
int device_type = dev->transport->get_device_type(dev);
|
|
|
|
/*
|
|
* Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
|
|
*/
|
|
pr_debug(" Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n",
|
|
wwn->vendor);
|
|
pr_debug(" Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n",
|
|
wwn->model);
|
|
pr_debug(" Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n",
|
|
wwn->revision);
|
|
pr_debug(" Type: %s ", scsi_device_type(device_type));
|
|
}
|
|
|
|
struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
|
|
{
|
|
struct se_device *dev;
|
|
struct se_lun *xcopy_lun;
|
|
|
|
dev = hba->backend->ops->alloc_device(hba, name);
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
dev->se_hba = hba;
|
|
dev->transport = hba->backend->ops;
|
|
dev->transport_flags = dev->transport->transport_flags_default;
|
|
dev->prot_length = sizeof(struct t10_pi_tuple);
|
|
dev->hba_index = hba->hba_index;
|
|
|
|
INIT_LIST_HEAD(&dev->dev_sep_list);
|
|
INIT_LIST_HEAD(&dev->dev_tmr_list);
|
|
INIT_LIST_HEAD(&dev->delayed_cmd_list);
|
|
INIT_LIST_HEAD(&dev->state_list);
|
|
INIT_LIST_HEAD(&dev->qf_cmd_list);
|
|
spin_lock_init(&dev->execute_task_lock);
|
|
spin_lock_init(&dev->delayed_cmd_lock);
|
|
spin_lock_init(&dev->dev_reservation_lock);
|
|
spin_lock_init(&dev->se_port_lock);
|
|
spin_lock_init(&dev->se_tmr_lock);
|
|
spin_lock_init(&dev->qf_cmd_lock);
|
|
sema_init(&dev->caw_sem, 1);
|
|
INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
|
|
spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
|
|
INIT_LIST_HEAD(&dev->t10_pr.registration_list);
|
|
INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
|
|
spin_lock_init(&dev->t10_pr.registration_lock);
|
|
spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
|
|
INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
|
|
spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
|
|
INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
|
|
spin_lock_init(&dev->t10_alua.lba_map_lock);
|
|
|
|
dev->t10_wwn.t10_dev = dev;
|
|
dev->t10_alua.t10_dev = dev;
|
|
|
|
dev->dev_attrib.da_dev = dev;
|
|
dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
|
|
dev->dev_attrib.emulate_dpo = 1;
|
|
dev->dev_attrib.emulate_fua_write = 1;
|
|
dev->dev_attrib.emulate_fua_read = 1;
|
|
dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
|
|
dev->dev_attrib.emulate_ua_intlck_ctrl = TARGET_UA_INTLCK_CTRL_CLEAR;
|
|
dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
|
|
dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
|
|
dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
|
|
dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
|
|
dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
|
|
dev->dev_attrib.emulate_pr = DA_EMULATE_PR;
|
|
dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
|
|
dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
|
|
dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
|
|
dev->dev_attrib.is_nonrot = DA_IS_NONROT;
|
|
dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
|
|
dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
|
|
dev->dev_attrib.max_unmap_block_desc_count =
|
|
DA_MAX_UNMAP_BLOCK_DESC_COUNT;
|
|
dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
|
|
dev->dev_attrib.unmap_granularity_alignment =
|
|
DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
|
|
dev->dev_attrib.unmap_zeroes_data =
|
|
DA_UNMAP_ZEROES_DATA_DEFAULT;
|
|
dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
|
|
|
|
xcopy_lun = &dev->xcopy_lun;
|
|
rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
|
|
init_completion(&xcopy_lun->lun_shutdown_comp);
|
|
INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
|
|
INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
|
|
mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
|
|
xcopy_lun->lun_tpg = &xcopy_pt_tpg;
|
|
|
|
/* Preload the default INQUIRY const values */
|
|
strlcpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
|
|
strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
|
|
sizeof(dev->t10_wwn.model));
|
|
strlcpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
|
|
sizeof(dev->t10_wwn.revision));
|
|
|
|
return dev;
|
|
}
|
|
|
|
/*
|
|
* Check if the underlying struct block_device request_queue supports
|
|
* the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
|
|
* in ATA and we need to set TPE=1
|
|
*/
|
|
bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
|
|
struct request_queue *q)
|
|
{
|
|
int block_size = queue_logical_block_size(q);
|
|
|
|
if (!blk_queue_discard(q))
|
|
return false;
|
|
|
|
attrib->max_unmap_lba_count =
|
|
q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
|
|
/*
|
|
* Currently hardcoded to 1 in Linux/SCSI code..
|
|
*/
|
|
attrib->max_unmap_block_desc_count = 1;
|
|
attrib->unmap_granularity = q->limits.discard_granularity / block_size;
|
|
attrib->unmap_granularity_alignment = q->limits.discard_alignment /
|
|
block_size;
|
|
attrib->unmap_zeroes_data = !!(q->limits.max_write_zeroes_sectors);
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL(target_configure_unmap_from_queue);
|
|
|
|
/*
|
|
* Convert from blocksize advertised to the initiator to the 512 byte
|
|
* units unconditionally used by the Linux block layer.
|
|
*/
|
|
sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
|
|
{
|
|
switch (dev->dev_attrib.block_size) {
|
|
case 4096:
|
|
return lb << 3;
|
|
case 2048:
|
|
return lb << 2;
|
|
case 1024:
|
|
return lb << 1;
|
|
default:
|
|
return lb;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(target_to_linux_sector);
|
|
|
|
struct devices_idr_iter {
|
|
struct config_item *prev_item;
|
|
int (*fn)(struct se_device *dev, void *data);
|
|
void *data;
|
|
};
|
|
|
|
static int target_devices_idr_iter(int id, void *p, void *data)
|
|
__must_hold(&device_mutex)
|
|
{
|
|
struct devices_idr_iter *iter = data;
|
|
struct se_device *dev = p;
|
|
int ret;
|
|
|
|
config_item_put(iter->prev_item);
|
|
iter->prev_item = NULL;
|
|
|
|
/*
|
|
* We add the device early to the idr, so it can be used
|
|
* by backend modules during configuration. We do not want
|
|
* to allow other callers to access partially setup devices,
|
|
* so we skip them here.
|
|
*/
|
|
if (!target_dev_configured(dev))
|
|
return 0;
|
|
|
|
iter->prev_item = config_item_get_unless_zero(&dev->dev_group.cg_item);
|
|
if (!iter->prev_item)
|
|
return 0;
|
|
mutex_unlock(&device_mutex);
|
|
|
|
ret = iter->fn(dev, iter->data);
|
|
|
|
mutex_lock(&device_mutex);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* target_for_each_device - iterate over configured devices
|
|
* @fn: iterator function
|
|
* @data: pointer to data that will be passed to fn
|
|
*
|
|
* fn must return 0 to continue looping over devices. non-zero will break
|
|
* from the loop and return that value to the caller.
|
|
*/
|
|
int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
|
|
void *data)
|
|
{
|
|
struct devices_idr_iter iter = { .fn = fn, .data = data };
|
|
int ret;
|
|
|
|
mutex_lock(&device_mutex);
|
|
ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
|
|
mutex_unlock(&device_mutex);
|
|
config_item_put(iter.prev_item);
|
|
return ret;
|
|
}
|
|
|
|
int target_configure_device(struct se_device *dev)
|
|
{
|
|
struct se_hba *hba = dev->se_hba;
|
|
int ret, id;
|
|
|
|
if (target_dev_configured(dev)) {
|
|
pr_err("se_dev->se_dev_ptr already set for storage"
|
|
" object\n");
|
|
return -EEXIST;
|
|
}
|
|
|
|
/*
|
|
* Add early so modules like tcmu can use during its
|
|
* configuration.
|
|
*/
|
|
mutex_lock(&device_mutex);
|
|
/*
|
|
* Use cyclic to try and avoid collisions with devices
|
|
* that were recently removed.
|
|
*/
|
|
id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
|
|
mutex_unlock(&device_mutex);
|
|
if (id < 0) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
dev->dev_index = id;
|
|
|
|
ret = dev->transport->configure_device(dev);
|
|
if (ret)
|
|
goto out_free_index;
|
|
/*
|
|
* XXX: there is not much point to have two different values here..
|
|
*/
|
|
dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
|
|
dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
|
|
|
|
/*
|
|
* Align max_hw_sectors down to PAGE_SIZE I/O transfers
|
|
*/
|
|
dev->dev_attrib.hw_max_sectors =
|
|
se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
|
|
dev->dev_attrib.hw_block_size);
|
|
dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
|
|
|
|
dev->creation_time = get_jiffies_64();
|
|
|
|
ret = core_setup_alua(dev);
|
|
if (ret)
|
|
goto out_destroy_device;
|
|
|
|
/*
|
|
* Setup work_queue for QUEUE_FULL
|
|
*/
|
|
INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
|
|
|
|
scsi_dump_inquiry(dev);
|
|
|
|
spin_lock(&hba->device_lock);
|
|
hba->dev_count++;
|
|
spin_unlock(&hba->device_lock);
|
|
|
|
dev->dev_flags |= DF_CONFIGURED;
|
|
|
|
return 0;
|
|
|
|
out_destroy_device:
|
|
dev->transport->destroy_device(dev);
|
|
out_free_index:
|
|
mutex_lock(&device_mutex);
|
|
idr_remove(&devices_idr, dev->dev_index);
|
|
mutex_unlock(&device_mutex);
|
|
out:
|
|
se_release_vpd_for_dev(dev);
|
|
return ret;
|
|
}
|
|
|
|
void target_free_device(struct se_device *dev)
|
|
{
|
|
struct se_hba *hba = dev->se_hba;
|
|
|
|
WARN_ON(!list_empty(&dev->dev_sep_list));
|
|
|
|
if (target_dev_configured(dev)) {
|
|
dev->transport->destroy_device(dev);
|
|
|
|
mutex_lock(&device_mutex);
|
|
idr_remove(&devices_idr, dev->dev_index);
|
|
mutex_unlock(&device_mutex);
|
|
|
|
spin_lock(&hba->device_lock);
|
|
hba->dev_count--;
|
|
spin_unlock(&hba->device_lock);
|
|
}
|
|
|
|
core_alua_free_lu_gp_mem(dev);
|
|
core_alua_set_lba_map(dev, NULL, 0, 0);
|
|
core_scsi3_free_all_registrations(dev);
|
|
se_release_vpd_for_dev(dev);
|
|
|
|
if (dev->transport->free_prot)
|
|
dev->transport->free_prot(dev);
|
|
|
|
dev->transport->free_device(dev);
|
|
}
|
|
|
|
int core_dev_setup_virtual_lun0(void)
|
|
{
|
|
struct se_hba *hba;
|
|
struct se_device *dev;
|
|
char buf[] = "rd_pages=8,rd_nullio=1";
|
|
int ret;
|
|
|
|
hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
|
|
if (IS_ERR(hba))
|
|
return PTR_ERR(hba);
|
|
|
|
dev = target_alloc_device(hba, "virt_lun0");
|
|
if (!dev) {
|
|
ret = -ENOMEM;
|
|
goto out_free_hba;
|
|
}
|
|
|
|
hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
|
|
|
|
ret = target_configure_device(dev);
|
|
if (ret)
|
|
goto out_free_se_dev;
|
|
|
|
lun0_hba = hba;
|
|
g_lun0_dev = dev;
|
|
return 0;
|
|
|
|
out_free_se_dev:
|
|
target_free_device(dev);
|
|
out_free_hba:
|
|
core_delete_hba(hba);
|
|
return ret;
|
|
}
|
|
|
|
|
|
void core_dev_release_virtual_lun0(void)
|
|
{
|
|
struct se_hba *hba = lun0_hba;
|
|
|
|
if (!hba)
|
|
return;
|
|
|
|
if (g_lun0_dev)
|
|
target_free_device(g_lun0_dev);
|
|
core_delete_hba(hba);
|
|
}
|
|
|
|
/*
|
|
* Common CDB parsing for kernel and user passthrough.
|
|
*/
|
|
sense_reason_t
|
|
passthrough_parse_cdb(struct se_cmd *cmd,
|
|
sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
|
|
{
|
|
unsigned char *cdb = cmd->t_task_cdb;
|
|
struct se_device *dev = cmd->se_dev;
|
|
unsigned int size;
|
|
|
|
/*
|
|
* For REPORT LUNS we always need to emulate the response, for everything
|
|
* else, pass it up.
|
|
*/
|
|
if (cdb[0] == REPORT_LUNS) {
|
|
cmd->execute_cmd = spc_emulate_report_luns;
|
|
return TCM_NO_SENSE;
|
|
}
|
|
|
|
/*
|
|
* With emulate_pr disabled, all reservation requests should fail,
|
|
* regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set.
|
|
*/
|
|
if (!dev->dev_attrib.emulate_pr &&
|
|
((cdb[0] == PERSISTENT_RESERVE_IN) ||
|
|
(cdb[0] == PERSISTENT_RESERVE_OUT) ||
|
|
(cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
|
|
(cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
|
|
return TCM_UNSUPPORTED_SCSI_OPCODE;
|
|
}
|
|
|
|
/*
|
|
* For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
|
|
* emulate the response, since tcmu does not have the information
|
|
* required to process these commands.
|
|
*/
|
|
if (!(dev->transport_flags &
|
|
TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
|
|
if (cdb[0] == PERSISTENT_RESERVE_IN) {
|
|
cmd->execute_cmd = target_scsi3_emulate_pr_in;
|
|
size = get_unaligned_be16(&cdb[7]);
|
|
return target_cmd_size_check(cmd, size);
|
|
}
|
|
if (cdb[0] == PERSISTENT_RESERVE_OUT) {
|
|
cmd->execute_cmd = target_scsi3_emulate_pr_out;
|
|
size = get_unaligned_be32(&cdb[5]);
|
|
return target_cmd_size_check(cmd, size);
|
|
}
|
|
|
|
if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
|
|
cmd->execute_cmd = target_scsi2_reservation_release;
|
|
if (cdb[0] == RELEASE_10)
|
|
size = get_unaligned_be16(&cdb[7]);
|
|
else
|
|
size = cmd->data_length;
|
|
return target_cmd_size_check(cmd, size);
|
|
}
|
|
if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
|
|
cmd->execute_cmd = target_scsi2_reservation_reserve;
|
|
if (cdb[0] == RESERVE_10)
|
|
size = get_unaligned_be16(&cdb[7]);
|
|
else
|
|
size = cmd->data_length;
|
|
return target_cmd_size_check(cmd, size);
|
|
}
|
|
}
|
|
|
|
/* Set DATA_CDB flag for ops that should have it */
|
|
switch (cdb[0]) {
|
|
case READ_6:
|
|
case READ_10:
|
|
case READ_12:
|
|
case READ_16:
|
|
case WRITE_6:
|
|
case WRITE_10:
|
|
case WRITE_12:
|
|
case WRITE_16:
|
|
case WRITE_VERIFY:
|
|
case WRITE_VERIFY_12:
|
|
case WRITE_VERIFY_16:
|
|
case COMPARE_AND_WRITE:
|
|
case XDWRITEREAD_10:
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
|
|
break;
|
|
case VARIABLE_LENGTH_CMD:
|
|
switch (get_unaligned_be16(&cdb[8])) {
|
|
case READ_32:
|
|
case WRITE_32:
|
|
case WRITE_VERIFY_32:
|
|
case XDWRITEREAD_32:
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
|
|
break;
|
|
}
|
|
}
|
|
|
|
cmd->execute_cmd = exec_cmd;
|
|
|
|
return TCM_NO_SENSE;
|
|
}
|
|
EXPORT_SYMBOL(passthrough_parse_cdb);
|