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1175 lines
31 KiB
1175 lines
31 KiB
// 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 <[email protected]> |
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* |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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/* |
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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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|
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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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|
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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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|
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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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|
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return ret; |
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} |
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EXPORT_SYMBOL(transport_lookup_cmd_lun); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return 0; |
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} |
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EXPORT_SYMBOL(transport_lookup_tmr_lun); |
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|
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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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|
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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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/* |
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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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|
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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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|
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return deve; |
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} |
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rcu_read_unlock(); |
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|
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return NULL; |
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} |
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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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|
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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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|
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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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|
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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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/* |
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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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|
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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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|
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return NULL; |
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} |
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EXPORT_SYMBOL(target_nacl_find_deve); |
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|
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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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|
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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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|
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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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|
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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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} |
|
if (orig->se_lun_acl != NULL) { |
|
pr_warn_ratelimited("Detected existing explicit" |
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" se_lun_acl->se_lun_group reference for %s" |
|
" mapped_lun: %llu, failing\n", |
|
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); |
|
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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rcu_assign_pointer(new->se_lun, lun); |
|
rcu_assign_pointer(new->se_lun_acl, lun_acl); |
|
hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist); |
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mutex_unlock(&nacl->lun_entry_mutex); |
|
|
|
spin_lock(&lun->lun_deve_lock); |
|
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); |
|
return 0; |
|
} |
|
|
|
void core_disable_device_list_for_node( |
|
struct se_lun *lun, |
|
struct se_dev_entry *orig, |
|
struct se_node_acl *nacl, |
|
struct se_portal_group *tpg) |
|
{ |
|
/* |
|
* 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); |
|
|
|
lockdep_assert_held(&nacl->lun_entry_mutex); |
|
|
|
/* |
|
* If the MappedLUN entry is being disabled, the entry in |
|
* lun->lun_deve_list must be removed now before clearing the |
|
* struct se_dev_entry pointers below as logic in |
|
* core_alua_do_transition_tg_pt() depends on these being present. |
|
* |
|
* deve->se_lun_acl will be NULL for demo-mode created LUNs |
|
* that have not been explicitly converted to MappedLUNs -> |
|
* struct se_lun_acl, but we remove deve->lun_link from |
|
* lun->lun_deve_list. This also means that active UAs and |
|
* NodeACL context specific PR metadata for demo-mode |
|
* MappedLUN *deve will be released below.. |
|
*/ |
|
spin_lock(&lun->lun_deve_lock); |
|
list_del(&orig->lun_link); |
|
spin_unlock(&lun->lun_deve_lock); |
|
/* |
|
* Disable struct se_dev_entry LUN ACL mapping |
|
*/ |
|
core_scsi3_ua_release_all(orig); |
|
|
|
hlist_del_rcu(&orig->link); |
|
clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags); |
|
orig->lun_access_ro = false; |
|
orig->creation_time = 0; |
|
orig->attach_count--; |
|
/* |
|
* Before firing off RCU callback, wait for any in process SPEC_I_PT=1 |
|
* or REGISTER_AND_MOVE PR operation to complete. |
|
*/ |
|
kref_put(&orig->pr_kref, target_pr_kref_release); |
|
wait_for_completion(&orig->pr_comp); |
|
|
|
rcu_assign_pointer(orig->se_lun, NULL); |
|
rcu_assign_pointer(orig->se_lun_acl, NULL); |
|
|
|
kfree_rcu(orig, rcu_head); |
|
|
|
core_scsi3_free_pr_reg_from_nacl(dev, nacl); |
|
target_luns_data_has_changed(nacl, NULL, false); |
|
} |
|
|
|
/* 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; |
|
int i; |
|
|
|
dev = hba->backend->ops->alloc_device(hba, name); |
|
if (!dev) |
|
return NULL; |
|
|
|
dev->queues = kcalloc(nr_cpu_ids, sizeof(*dev->queues), GFP_KERNEL); |
|
if (!dev->queues) { |
|
dev->transport->free_device(dev); |
|
return NULL; |
|
} |
|
|
|
dev->queue_cnt = nr_cpu_ids; |
|
for (i = 0; i < dev->queue_cnt; i++) { |
|
INIT_LIST_HEAD(&dev->queues[i].state_list); |
|
spin_lock_init(&dev->queues[i].lock); |
|
} |
|
|
|
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->qf_cmd_list); |
|
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); |
|
|
|
kfree(dev->queues); |
|
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);
|
|
|