// SPDX-License-Identifier: GPL-2.0-or-later /******************************************************************************* * Filename: target_core_device.c (based on iscsi_target_device.c) * * This file contains the TCM Virtual Device and Disk Transport * agnostic related functions. * * (c) Copyright 2003-2013 Datera, Inc. * * Nicholas A. Bellinger * ******************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "target_core_internal.h" #include "target_core_alua.h" #include "target_core_pr.h" #include "target_core_ua.h" static DEFINE_MUTEX(device_mutex); static LIST_HEAD(device_list); static DEFINE_IDR(devices_idr); static struct se_hba *lun0_hba; /* not static, needed by tpg.c */ struct se_device *g_lun0_dev; sense_reason_t transport_lookup_cmd_lun(struct se_cmd *se_cmd) { struct se_lun *se_lun = NULL; struct se_session *se_sess = se_cmd->se_sess; struct se_node_acl *nacl = se_sess->se_node_acl; struct se_dev_entry *deve; sense_reason_t ret = TCM_NO_SENSE; rcu_read_lock(); deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun); if (deve) { atomic_long_inc(&deve->total_cmds); if (se_cmd->data_direction == DMA_TO_DEVICE) atomic_long_add(se_cmd->data_length, &deve->write_bytes); else if (se_cmd->data_direction == DMA_FROM_DEVICE) atomic_long_add(se_cmd->data_length, &deve->read_bytes); if ((se_cmd->data_direction == DMA_TO_DEVICE) && deve->lun_access_ro) { pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN" " Access for 0x%08llx\n", se_cmd->se_tfo->fabric_name, se_cmd->orig_fe_lun); rcu_read_unlock(); return TCM_WRITE_PROTECTED; } se_lun = deve->se_lun; if (!percpu_ref_tryget_live(&se_lun->lun_ref)) { se_lun = NULL; goto out_unlock; } se_cmd->se_lun = se_lun; se_cmd->pr_res_key = deve->pr_res_key; se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; se_cmd->lun_ref_active = true; } out_unlock: rcu_read_unlock(); if (!se_lun) { /* * Use the se_portal_group->tpg_virt_lun0 to allow for * REPORT_LUNS, et al to be returned when no active * MappedLUN=0 exists for this Initiator Port. */ if (se_cmd->orig_fe_lun != 0) { pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN" " Access for 0x%08llx from %s\n", se_cmd->se_tfo->fabric_name, se_cmd->orig_fe_lun, nacl->initiatorname); return TCM_NON_EXISTENT_LUN; } /* * Force WRITE PROTECT for virtual LUN 0 */ if ((se_cmd->data_direction != DMA_FROM_DEVICE) && (se_cmd->data_direction != DMA_NONE)) return TCM_WRITE_PROTECTED; se_lun = se_sess->se_tpg->tpg_virt_lun0; if (!percpu_ref_tryget_live(&se_lun->lun_ref)) return TCM_NON_EXISTENT_LUN; se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0; se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; se_cmd->lun_ref_active = true; } /* * RCU reference protected by percpu se_lun->lun_ref taken above that * must drop to zero (including initial reference) before this se_lun * pointer can be kfree_rcu() by the final se_lun->lun_group put via * target_core_fabric_configfs.c:target_fabric_port_release */ se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev); atomic_long_inc(&se_cmd->se_dev->num_cmds); if (se_cmd->data_direction == DMA_TO_DEVICE) atomic_long_add(se_cmd->data_length, &se_cmd->se_dev->write_bytes); else if (se_cmd->data_direction == DMA_FROM_DEVICE) atomic_long_add(se_cmd->data_length, &se_cmd->se_dev->read_bytes); return ret; } EXPORT_SYMBOL(transport_lookup_cmd_lun); int transport_lookup_tmr_lun(struct se_cmd *se_cmd) { struct se_dev_entry *deve; struct se_lun *se_lun = NULL; struct se_session *se_sess = se_cmd->se_sess; struct se_node_acl *nacl = se_sess->se_node_acl; struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; unsigned long flags; rcu_read_lock(); deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun); if (deve) { se_lun = deve->se_lun; if (!percpu_ref_tryget_live(&se_lun->lun_ref)) { se_lun = NULL; goto out_unlock; } se_cmd->se_lun = se_lun; se_cmd->pr_res_key = deve->pr_res_key; se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; se_cmd->lun_ref_active = true; } out_unlock: rcu_read_unlock(); if (!se_lun) { pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN" " Access for 0x%08llx for %s\n", se_cmd->se_tfo->fabric_name, se_cmd->orig_fe_lun, nacl->initiatorname); return -ENODEV; } se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev); se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev); spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags); list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list); spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags); return 0; } EXPORT_SYMBOL(transport_lookup_tmr_lun); bool target_lun_is_rdonly(struct se_cmd *cmd) { struct se_session *se_sess = cmd->se_sess; struct se_dev_entry *deve; bool ret; rcu_read_lock(); deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun); ret = deve && deve->lun_access_ro; rcu_read_unlock(); return ret; } EXPORT_SYMBOL(target_lun_is_rdonly); /* * This function is called from core_scsi3_emulate_pro_register_and_move() * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref * when a matching rtpi is found. */ struct se_dev_entry *core_get_se_deve_from_rtpi( struct se_node_acl *nacl, u16 rtpi) { struct se_dev_entry *deve; struct se_lun *lun; struct se_portal_group *tpg = nacl->se_tpg; rcu_read_lock(); hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { lun = deve->se_lun; if (!lun) { pr_err("%s device entries device pointer is" " NULL, but Initiator has access.\n", tpg->se_tpg_tfo->fabric_name); continue; } if (lun->lun_rtpi != rtpi) continue; kref_get(&deve->pr_kref); rcu_read_unlock(); return deve; } rcu_read_unlock(); return NULL; } void core_free_device_list_for_node( struct se_node_acl *nacl, struct se_portal_group *tpg) { struct se_dev_entry *deve; mutex_lock(&nacl->lun_entry_mutex); hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) core_disable_device_list_for_node(deve->se_lun, deve, nacl, tpg); mutex_unlock(&nacl->lun_entry_mutex); } void core_update_device_list_access( u64 mapped_lun, bool lun_access_ro, struct se_node_acl *nacl) { struct se_dev_entry *deve; mutex_lock(&nacl->lun_entry_mutex); deve = target_nacl_find_deve(nacl, mapped_lun); if (deve) deve->lun_access_ro = lun_access_ro; mutex_unlock(&nacl->lun_entry_mutex); } /* * Called with rcu_read_lock or nacl->device_list_lock held. */ struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun) { struct se_dev_entry *deve; hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) if (deve->mapped_lun == mapped_lun) return deve; return NULL; } EXPORT_SYMBOL(target_nacl_find_deve); void target_pr_kref_release(struct kref *kref) { struct se_dev_entry *deve = container_of(kref, struct se_dev_entry, pr_kref); complete(&deve->pr_comp); } static void target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new, bool skip_new) { struct se_dev_entry *tmp; rcu_read_lock(); hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) { if (skip_new && tmp == new) continue; core_scsi3_ua_allocate(tmp, 0x3F, ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED); } rcu_read_unlock(); } int core_enable_device_list_for_node( struct se_lun *lun, struct se_lun_acl *lun_acl, u64 mapped_lun, bool lun_access_ro, struct se_node_acl *nacl, struct se_portal_group *tpg) { struct se_dev_entry *orig, *new; new = kzalloc(sizeof(*new), GFP_KERNEL); if (!new) { pr_err("Unable to allocate se_dev_entry memory\n"); return -ENOMEM; } spin_lock_init(&new->ua_lock); INIT_LIST_HEAD(&new->ua_list); INIT_LIST_HEAD(&new->lun_link); new->mapped_lun = mapped_lun; kref_init(&new->pr_kref); init_completion(&new->pr_comp); new->lun_access_ro = lun_access_ro; new->creation_time = get_jiffies_64(); new->attach_count++; mutex_lock(&nacl->lun_entry_mutex); orig = target_nacl_find_deve(nacl, mapped_lun); if (orig && orig->se_lun) { struct se_lun *orig_lun = orig->se_lun; if (orig_lun != lun) { pr_err("Existing orig->se_lun doesn't match new lun" " for dynamic -> explicit NodeACL conversion:" " %s\n", nacl->initiatorname); mutex_unlock(&nacl->lun_entry_mutex); kfree(new); return -EINVAL; } if (orig->se_lun_acl != NULL) { pr_warn_ratelimited("Detected existing explicit" " se_lun_acl->se_lun_group reference for %s" " mapped_lun: %llu, failing\n", nacl->initiatorname, mapped_lun); mutex_unlock(&nacl->lun_entry_mutex); kfree(new); return -EINVAL; } new->se_lun = lun; new->se_lun_acl = lun_acl; hlist_del_rcu(&orig->link); hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist); mutex_unlock(&nacl->lun_entry_mutex); spin_lock(&lun->lun_deve_lock); list_del(&orig->lun_link); list_add_tail(&new->lun_link, &lun->lun_deve_list); spin_unlock(&lun->lun_deve_lock); kref_put(&orig->pr_kref, target_pr_kref_release); wait_for_completion(&orig->pr_comp); target_luns_data_has_changed(nacl, new, true); kfree_rcu(orig, rcu_head); return 0; } new->se_lun = lun; new->se_lun_acl = lun_acl; hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist); mutex_unlock(&nacl->lun_entry_mutex); spin_lock(&lun->lun_deve_lock); list_add_tail(&new->lun_link, &lun->lun_deve_list); spin_unlock(&lun->lun_deve_lock); 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); 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) { if (lun != deve->se_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++) { struct se_device_queue *q; q = &dev->queues[i]; INIT_LIST_HEAD(&q->state_list); spin_lock_init(&q->lock); init_llist_head(&q->sq.cmd_list); INIT_WORK(&q->sq.work, target_queued_submit_work); } 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); INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work); dev->t10_wwn.t10_dev = dev; /* * Use OpenFabrics IEEE Company ID: 00 14 05 */ dev->t10_wwn.company_id = 0x001405; 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 supports discard and if yes * configure the UNMAP parameters. */ bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib, struct block_device *bdev) { int block_size = bdev_logical_block_size(bdev); if (!bdev_max_discard_sectors(bdev)) return false; attrib->max_unmap_lba_count = bdev_max_discard_sectors(bdev) >> (ilog2(block_size) - 9); /* * Currently hardcoded to 1 in Linux/SCSI code.. */ attrib->max_unmap_block_desc_count = 1; attrib->unmap_granularity = bdev_discard_granularity(bdev) / block_size; attrib->unmap_granularity_alignment = bdev_discard_alignment(bdev) / block_size; 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; if (dev->transport->configure_unmap && dev->transport->configure_unmap(dev)) { pr_debug("Discard support available, but disabled by default.\n"); } /* * 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,rd_dummy=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);