/******************************************************************************* * Filename: target_core_tpg.c * * This file contains generic Target Portal Group related functions. * * (c) Copyright 2002-2013 Datera, Inc. * * Nicholas A. Bellinger * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * ******************************************************************************/ #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" extern struct se_device *g_lun0_dev; static DEFINE_SPINLOCK(tpg_lock); static LIST_HEAD(tpg_list); /* __core_tpg_get_initiator_node_acl(): * * mutex_lock(&tpg->acl_node_mutex); must be held when calling */ struct se_node_acl *__core_tpg_get_initiator_node_acl( struct se_portal_group *tpg, const char *initiatorname) { struct se_node_acl *acl; list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { if (!strcmp(acl->initiatorname, initiatorname)) return acl; } return NULL; } /* core_tpg_get_initiator_node_acl(): * * */ struct se_node_acl *core_tpg_get_initiator_node_acl( struct se_portal_group *tpg, unsigned char *initiatorname) { struct se_node_acl *acl; /* * Obtain se_node_acl->acl_kref using fabric driver provided * initiatorname[] during node acl endpoint lookup driven by * new se_session login. * * The reference is held until se_session shutdown -> release * occurs via fabric driver invoked transport_deregister_session() * or transport_free_session() code. */ mutex_lock(&tpg->acl_node_mutex); acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); if (acl) { if (!kref_get_unless_zero(&acl->acl_kref)) acl = NULL; } mutex_unlock(&tpg->acl_node_mutex); return acl; } EXPORT_SYMBOL(core_tpg_get_initiator_node_acl); void core_allocate_nexus_loss_ua( struct se_node_acl *nacl) { struct se_dev_entry *deve; if (!nacl) return; rcu_read_lock(); hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) core_scsi3_ua_allocate(deve, 0x29, ASCQ_29H_NEXUS_LOSS_OCCURRED); rcu_read_unlock(); } EXPORT_SYMBOL(core_allocate_nexus_loss_ua); /* core_tpg_add_node_to_devs(): * * */ void core_tpg_add_node_to_devs( struct se_node_acl *acl, struct se_portal_group *tpg, struct se_lun *lun_orig) { bool lun_access_ro = true; struct se_lun *lun; struct se_device *dev; mutex_lock(&tpg->tpg_lun_mutex); hlist_for_each_entry_rcu(lun, &tpg->tpg_lun_hlist, link) { if (lun_orig && lun != lun_orig) continue; dev = rcu_dereference_check(lun->lun_se_dev, lockdep_is_held(&tpg->tpg_lun_mutex)); /* * By default in LIO-Target $FABRIC_MOD, * demo_mode_write_protect is ON, or READ_ONLY; */ if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) { lun_access_ro = false; } else { /* * Allow only optical drives to issue R/W in default RO * demo mode. */ if (dev->transport->get_device_type(dev) == TYPE_DISK) lun_access_ro = true; else lun_access_ro = false; } pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%llu] - Adding %s" " access for LUN in Demo Mode\n", tpg->se_tpg_tfo->get_fabric_name(), tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lun_access_ro ? "READ-ONLY" : "READ-WRITE"); core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun, lun_access_ro, acl, tpg); /* * Check to see if there are any existing persistent reservation * APTPL pre-registrations that need to be enabled for this dynamic * LUN ACL now.. */ core_scsi3_check_aptpl_registration(dev, tpg, lun, acl, lun->unpacked_lun); } mutex_unlock(&tpg->tpg_lun_mutex); } static void target_set_nacl_queue_depth(struct se_portal_group *tpg, struct se_node_acl *acl, u32 queue_depth) { acl->queue_depth = queue_depth; if (!acl->queue_depth) { pr_warn("Queue depth for %s Initiator Node: %s is 0," "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname); acl->queue_depth = 1; } } static struct se_node_acl *target_alloc_node_acl(struct se_portal_group *tpg, const unsigned char *initiatorname) { struct se_node_acl *acl; u32 queue_depth; acl = kzalloc(max(sizeof(*acl), tpg->se_tpg_tfo->node_acl_size), GFP_KERNEL); if (!acl) return NULL; INIT_LIST_HEAD(&acl->acl_list); INIT_LIST_HEAD(&acl->acl_sess_list); INIT_HLIST_HEAD(&acl->lun_entry_hlist); kref_init(&acl->acl_kref); init_completion(&acl->acl_free_comp); spin_lock_init(&acl->nacl_sess_lock); mutex_init(&acl->lun_entry_mutex); atomic_set(&acl->acl_pr_ref_count, 0); if (tpg->se_tpg_tfo->tpg_get_default_depth) queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg); else queue_depth = 1; target_set_nacl_queue_depth(tpg, acl, queue_depth); snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname); acl->se_tpg = tpg; acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX); tpg->se_tpg_tfo->set_default_node_attributes(acl); return acl; } static void target_add_node_acl(struct se_node_acl *acl) { struct se_portal_group *tpg = acl->se_tpg; mutex_lock(&tpg->acl_node_mutex); list_add_tail(&acl->acl_list, &tpg->acl_node_list); mutex_unlock(&tpg->acl_node_mutex); pr_debug("%s_TPG[%hu] - Added %s ACL with TCQ Depth: %d for %s" " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(), tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->dynamic_node_acl ? "DYNAMIC" : "", acl->queue_depth, tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname); } bool target_tpg_has_node_acl(struct se_portal_group *tpg, const char *initiatorname) { struct se_node_acl *acl; bool found = false; mutex_lock(&tpg->acl_node_mutex); list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { if (!strcmp(acl->initiatorname, initiatorname)) { found = true; break; } } mutex_unlock(&tpg->acl_node_mutex); return found; } EXPORT_SYMBOL(target_tpg_has_node_acl); struct se_node_acl *core_tpg_check_initiator_node_acl( struct se_portal_group *tpg, unsigned char *initiatorname) { struct se_node_acl *acl; acl = core_tpg_get_initiator_node_acl(tpg, initiatorname); if (acl) return acl; if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) return NULL; acl = target_alloc_node_acl(tpg, initiatorname); if (!acl) return NULL; /* * When allocating a dynamically generated node_acl, go ahead * and take the extra kref now before returning to the fabric * driver caller. * * Note this reference will be released at session shutdown * time within transport_free_session() code. */ kref_get(&acl->acl_kref); acl->dynamic_node_acl = 1; /* * Here we only create demo-mode MappedLUNs from the active * TPG LUNs if the fabric is not explicitly asking for * tpg_check_demo_mode_login_only() == 1. */ if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) || (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1)) core_tpg_add_node_to_devs(acl, tpg, NULL); target_add_node_acl(acl); return acl; } EXPORT_SYMBOL(core_tpg_check_initiator_node_acl); void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl) { while (atomic_read(&nacl->acl_pr_ref_count) != 0) cpu_relax(); } struct se_node_acl *core_tpg_add_initiator_node_acl( struct se_portal_group *tpg, const char *initiatorname) { struct se_node_acl *acl; mutex_lock(&tpg->acl_node_mutex); acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); if (acl) { if (acl->dynamic_node_acl) { acl->dynamic_node_acl = 0; pr_debug("%s_TPG[%u] - Replacing dynamic ACL" " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname); mutex_unlock(&tpg->acl_node_mutex); return acl; } pr_err("ACL entry for %s Initiator" " Node %s already exists for TPG %u, ignoring" " request.\n", tpg->se_tpg_tfo->get_fabric_name(), initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg)); mutex_unlock(&tpg->acl_node_mutex); return ERR_PTR(-EEXIST); } mutex_unlock(&tpg->acl_node_mutex); acl = target_alloc_node_acl(tpg, initiatorname); if (!acl) return ERR_PTR(-ENOMEM); target_add_node_acl(acl); return acl; } static void target_shutdown_sessions(struct se_node_acl *acl, bool acl_stop) { struct se_session *sess; unsigned long flags; int ret; spin_lock_irqsave(&acl->nacl_sess_lock, flags); if (acl_stop) acl->acl_stop = 1; restart: list_for_each_entry(sess, &acl->acl_sess_list, sess_acl_list) { if (sess->sess_tearing_down) continue; if (!target_get_session(sess)) continue; list_del(&sess->sess_acl_list); spin_unlock_irqrestore(&acl->nacl_sess_lock, flags); ret = acl->se_tpg->se_tpg_tfo->shutdown_session(sess); target_put_session(sess); if (ret) target_put_session(sess); spin_lock_irqsave(&acl->nacl_sess_lock, flags); goto restart; } spin_unlock_irqrestore(&acl->nacl_sess_lock, flags); } void core_tpg_del_initiator_node_acl(struct se_node_acl *acl) { struct se_portal_group *tpg = acl->se_tpg; mutex_lock(&tpg->acl_node_mutex); if (acl->dynamic_node_acl) acl->dynamic_node_acl = 0; list_del(&acl->acl_list); mutex_unlock(&tpg->acl_node_mutex); target_shutdown_sessions(acl, true); target_put_nacl(acl); /* * Wait for last target_put_nacl() to complete in target_complete_nacl() * for active fabric session transport_deregister_session() callbacks. */ wait_for_completion(&acl->acl_free_comp); core_tpg_wait_for_nacl_pr_ref(acl); core_free_device_list_for_node(acl, tpg); pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s" " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(), tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth, tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname); kfree(acl); } /* core_tpg_set_initiator_node_queue_depth(): * * */ int core_tpg_set_initiator_node_queue_depth( struct se_node_acl *acl, u32 queue_depth) { struct se_portal_group *tpg = acl->se_tpg; /* * User has requested to change the queue depth for a Initiator Node. * Change the value in the Node's struct se_node_acl, and call * target_set_nacl_queue_depth() to set the new queue depth. */ target_set_nacl_queue_depth(tpg, acl, queue_depth); /* * Shutdown all pending sessions to force session reinstatement. */ target_shutdown_sessions(acl, false); pr_debug("Successfully changed queue depth to: %d for Initiator" " Node: %s on %s Target Portal Group: %u\n", acl->queue_depth, acl->initiatorname, tpg->se_tpg_tfo->get_fabric_name(), tpg->se_tpg_tfo->tpg_get_tag(tpg)); return 0; } EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth); /* core_tpg_set_initiator_node_tag(): * * Initiator nodeacl tags are not used internally, but may be used by * userspace to emulate aliases or groups. * Returns length of newly-set tag or -EINVAL. */ int core_tpg_set_initiator_node_tag( struct se_portal_group *tpg, struct se_node_acl *acl, const char *new_tag) { if (strlen(new_tag) >= MAX_ACL_TAG_SIZE) return -EINVAL; if (!strncmp("NULL", new_tag, 4)) { acl->acl_tag[0] = '\0'; return 0; } return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag); } EXPORT_SYMBOL(core_tpg_set_initiator_node_tag); static void core_tpg_lun_ref_release(struct percpu_ref *ref) { struct se_lun *lun = container_of(ref, struct se_lun, lun_ref); complete(&lun->lun_ref_comp); } int core_tpg_register( struct se_wwn *se_wwn, struct se_portal_group *se_tpg, int proto_id) { int ret; if (!se_tpg) return -EINVAL; /* * For the typical case where core_tpg_register() is called by a * fabric driver from target_core_fabric_ops->fabric_make_tpg() * configfs context, use the original tf_ops pointer already saved * by target-core in target_fabric_make_wwn(). * * Otherwise, for special cases like iscsi-target discovery TPGs * the caller is responsible for setting ->se_tpg_tfo ahead of * calling core_tpg_register(). */ if (se_wwn) se_tpg->se_tpg_tfo = se_wwn->wwn_tf->tf_ops; if (!se_tpg->se_tpg_tfo) { pr_err("Unable to locate se_tpg->se_tpg_tfo pointer\n"); return -EINVAL; } INIT_HLIST_HEAD(&se_tpg->tpg_lun_hlist); se_tpg->proto_id = proto_id; se_tpg->se_tpg_wwn = se_wwn; atomic_set(&se_tpg->tpg_pr_ref_count, 0); INIT_LIST_HEAD(&se_tpg->acl_node_list); INIT_LIST_HEAD(&se_tpg->se_tpg_node); INIT_LIST_HEAD(&se_tpg->tpg_sess_list); spin_lock_init(&se_tpg->session_lock); mutex_init(&se_tpg->tpg_lun_mutex); mutex_init(&se_tpg->acl_node_mutex); if (se_tpg->proto_id >= 0) { se_tpg->tpg_virt_lun0 = core_tpg_alloc_lun(se_tpg, 0); if (IS_ERR(se_tpg->tpg_virt_lun0)) return PTR_ERR(se_tpg->tpg_virt_lun0); ret = core_tpg_add_lun(se_tpg, se_tpg->tpg_virt_lun0, true, g_lun0_dev); if (ret < 0) { kfree(se_tpg->tpg_virt_lun0); return ret; } } spin_lock_bh(&tpg_lock); list_add_tail(&se_tpg->se_tpg_node, &tpg_list); spin_unlock_bh(&tpg_lock); pr_debug("TARGET_CORE[%s]: Allocated portal_group for endpoint: %s, " "Proto: %d, Portal Tag: %u\n", se_tpg->se_tpg_tfo->get_fabric_name(), se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) ? se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) : NULL, se_tpg->proto_id, se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); return 0; } EXPORT_SYMBOL(core_tpg_register); int core_tpg_deregister(struct se_portal_group *se_tpg) { const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo; struct se_node_acl *nacl, *nacl_tmp; LIST_HEAD(node_list); pr_debug("TARGET_CORE[%s]: Deallocating portal_group for endpoint: %s, " "Proto: %d, Portal Tag: %u\n", tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg) ? tfo->tpg_get_wwn(se_tpg) : NULL, se_tpg->proto_id, tfo->tpg_get_tag(se_tpg)); spin_lock_bh(&tpg_lock); list_del(&se_tpg->se_tpg_node); spin_unlock_bh(&tpg_lock); while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0) cpu_relax(); mutex_lock(&se_tpg->acl_node_mutex); list_splice_init(&se_tpg->acl_node_list, &node_list); mutex_unlock(&se_tpg->acl_node_mutex); /* * Release any remaining demo-mode generated se_node_acl that have * not been released because of TFO->tpg_check_demo_mode_cache() == 1 * in transport_deregister_session(). */ list_for_each_entry_safe(nacl, nacl_tmp, &node_list, acl_list) { list_del(&nacl->acl_list); core_tpg_wait_for_nacl_pr_ref(nacl); core_free_device_list_for_node(nacl, se_tpg); kfree(nacl); } if (se_tpg->proto_id >= 0) { core_tpg_remove_lun(se_tpg, se_tpg->tpg_virt_lun0); kfree_rcu(se_tpg->tpg_virt_lun0, rcu_head); } return 0; } EXPORT_SYMBOL(core_tpg_deregister); struct se_lun *core_tpg_alloc_lun( struct se_portal_group *tpg, u64 unpacked_lun) { struct se_lun *lun; lun = kzalloc(sizeof(*lun), GFP_KERNEL); if (!lun) { pr_err("Unable to allocate se_lun memory\n"); return ERR_PTR(-ENOMEM); } lun->unpacked_lun = unpacked_lun; lun->lun_link_magic = SE_LUN_LINK_MAGIC; atomic_set(&lun->lun_acl_count, 0); init_completion(&lun->lun_ref_comp); INIT_LIST_HEAD(&lun->lun_deve_list); INIT_LIST_HEAD(&lun->lun_dev_link); atomic_set(&lun->lun_tg_pt_secondary_offline, 0); spin_lock_init(&lun->lun_deve_lock); mutex_init(&lun->lun_tg_pt_md_mutex); INIT_LIST_HEAD(&lun->lun_tg_pt_gp_link); spin_lock_init(&lun->lun_tg_pt_gp_lock); lun->lun_tpg = tpg; return lun; } int core_tpg_add_lun( struct se_portal_group *tpg, struct se_lun *lun, bool lun_access_ro, struct se_device *dev) { int ret; ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release, 0, GFP_KERNEL); if (ret < 0) goto out; ret = core_alloc_rtpi(lun, dev); if (ret) goto out_kill_ref; if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) && !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) target_attach_tg_pt_gp(lun, dev->t10_alua.default_tg_pt_gp); mutex_lock(&tpg->tpg_lun_mutex); spin_lock(&dev->se_port_lock); lun->lun_index = dev->dev_index; rcu_assign_pointer(lun->lun_se_dev, dev); dev->export_count++; list_add_tail(&lun->lun_dev_link, &dev->dev_sep_list); spin_unlock(&dev->se_port_lock); if (dev->dev_flags & DF_READ_ONLY) lun->lun_access_ro = true; else lun->lun_access_ro = lun_access_ro; if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) hlist_add_head_rcu(&lun->link, &tpg->tpg_lun_hlist); mutex_unlock(&tpg->tpg_lun_mutex); return 0; out_kill_ref: percpu_ref_exit(&lun->lun_ref); out: return ret; } void core_tpg_remove_lun( struct se_portal_group *tpg, struct se_lun *lun) { /* * 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); core_clear_lun_from_tpg(lun, tpg); /* * Wait for any active I/O references to percpu se_lun->lun_ref to * be released. Also, se_lun->lun_ref is now used by PR and ALUA * logic when referencing a remote target port during ALL_TGT_PT=1 * and generating UNIT_ATTENTIONs for ALUA access state transition. */ transport_clear_lun_ref(lun); mutex_lock(&tpg->tpg_lun_mutex); if (lun->lun_se_dev) { target_detach_tg_pt_gp(lun); spin_lock(&dev->se_port_lock); list_del(&lun->lun_dev_link); dev->export_count--; rcu_assign_pointer(lun->lun_se_dev, NULL); spin_unlock(&dev->se_port_lock); } if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) hlist_del_rcu(&lun->link); mutex_unlock(&tpg->tpg_lun_mutex); percpu_ref_exit(&lun->lun_ref); }