| /******************************************************************************* |
| * Filename: target_core_tpg.c |
| * |
| * This file contains generic Target Portal Group related functions. |
| * |
| * (c) Copyright 2002-2013 Datera, Inc. |
| * |
| * Nicholas A. Bellinger <nab@kernel.org> |
| * |
| * 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 <linux/net.h> |
| #include <linux/string.h> |
| #include <linux/timer.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/in.h> |
| #include <linux/export.h> |
| #include <net/sock.h> |
| #include <net/tcp.h> |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_cmnd.h> |
| |
| #include <target/target_core_base.h> |
| #include <target/target_core_backend.h> |
| #include <target/target_core_fabric.h> |
| |
| #include "target_core_internal.h" |
| |
| extern struct se_device *g_lun0_dev; |
| |
| static DEFINE_SPINLOCK(tpg_lock); |
| static LIST_HEAD(tpg_list); |
| |
| /* core_clear_initiator_node_from_tpg(): |
| * |
| * |
| */ |
| static void core_clear_initiator_node_from_tpg( |
| struct se_node_acl *nacl, |
| struct se_portal_group *tpg) |
| { |
| int i; |
| struct se_dev_entry *deve; |
| struct se_lun *lun; |
| |
| spin_lock_irq(&nacl->device_list_lock); |
| for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { |
| deve = nacl->device_list[i]; |
| |
| if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS)) |
| continue; |
| |
| if (!deve->se_lun) { |
| pr_err("%s device entries device pointer is" |
| " NULL, but Initiator has access.\n", |
| tpg->se_tpg_tfo->get_fabric_name()); |
| continue; |
| } |
| |
| lun = deve->se_lun; |
| spin_unlock_irq(&nacl->device_list_lock); |
| core_disable_device_list_for_node(lun, NULL, deve->mapped_lun, |
| TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg); |
| |
| spin_lock_irq(&nacl->device_list_lock); |
| } |
| spin_unlock_irq(&nacl->device_list_lock); |
| } |
| |
| /* __core_tpg_get_initiator_node_acl(): |
| * |
| * spin_lock_bh(&tpg->acl_node_lock); 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; |
| |
| spin_lock_irq(&tpg->acl_node_lock); |
| acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); |
| spin_unlock_irq(&tpg->acl_node_lock); |
| |
| return acl; |
| } |
| EXPORT_SYMBOL(core_tpg_get_initiator_node_acl); |
| |
| /* core_tpg_add_node_to_devs(): |
| * |
| * |
| */ |
| void core_tpg_add_node_to_devs( |
| struct se_node_acl *acl, |
| struct se_portal_group *tpg) |
| { |
| int i = 0; |
| u32 lun_access = 0; |
| struct se_lun *lun; |
| struct se_device *dev; |
| |
| spin_lock(&tpg->tpg_lun_lock); |
| for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { |
| lun = tpg->tpg_lun_list[i]; |
| if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) |
| continue; |
| |
| spin_unlock(&tpg->tpg_lun_lock); |
| |
| dev = lun->lun_se_dev; |
| /* |
| * 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 = TRANSPORT_LUNFLAGS_READ_WRITE; |
| } 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 = TRANSPORT_LUNFLAGS_READ_ONLY; |
| else |
| lun_access = TRANSPORT_LUNFLAGS_READ_WRITE; |
| } |
| |
| pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - 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 == TRANSPORT_LUNFLAGS_READ_WRITE) ? |
| "READ-WRITE" : "READ-ONLY"); |
| |
| core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun, |
| lun_access, acl, tpg); |
| spin_lock(&tpg->tpg_lun_lock); |
| } |
| spin_unlock(&tpg->tpg_lun_lock); |
| } |
| |
| /* core_set_queue_depth_for_node(): |
| * |
| * |
| */ |
| static int core_set_queue_depth_for_node( |
| struct se_portal_group *tpg, |
| struct se_node_acl *acl) |
| { |
| if (!acl->queue_depth) { |
| pr_err("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; |
| } |
| |
| return 0; |
| } |
| |
| void array_free(void *array, int n) |
| { |
| void **a = array; |
| int i; |
| |
| for (i = 0; i < n; i++) |
| kfree(a[i]); |
| kfree(a); |
| } |
| |
| static void *array_zalloc(int n, size_t size, gfp_t flags) |
| { |
| void **a; |
| int i; |
| |
| a = kzalloc(n * sizeof(void*), flags); |
| if (!a) |
| return NULL; |
| for (i = 0; i < n; i++) { |
| a[i] = kzalloc(size, flags); |
| if (!a[i]) { |
| array_free(a, n); |
| return NULL; |
| } |
| } |
| return a; |
| } |
| |
| /* core_create_device_list_for_node(): |
| * |
| * |
| */ |
| static int core_create_device_list_for_node(struct se_node_acl *nacl) |
| { |
| struct se_dev_entry *deve; |
| int i; |
| |
| nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG, |
| sizeof(struct se_dev_entry), GFP_KERNEL); |
| if (!nacl->device_list) { |
| pr_err("Unable to allocate memory for" |
| " struct se_node_acl->device_list\n"); |
| return -ENOMEM; |
| } |
| for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { |
| deve = nacl->device_list[i]; |
| |
| atomic_set(&deve->ua_count, 0); |
| atomic_set(&deve->pr_ref_count, 0); |
| spin_lock_init(&deve->ua_lock); |
| INIT_LIST_HEAD(&deve->alua_port_list); |
| INIT_LIST_HEAD(&deve->ua_list); |
| } |
| |
| return 0; |
| } |
| |
| /* core_tpg_check_initiator_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 = tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg); |
| if (!acl) |
| return NULL; |
| |
| INIT_LIST_HEAD(&acl->acl_list); |
| INIT_LIST_HEAD(&acl->acl_sess_list); |
| kref_init(&acl->acl_kref); |
| init_completion(&acl->acl_free_comp); |
| spin_lock_init(&acl->device_list_lock); |
| spin_lock_init(&acl->nacl_sess_lock); |
| atomic_set(&acl->acl_pr_ref_count, 0); |
| acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg); |
| snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname); |
| acl->se_tpg = tpg; |
| acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX); |
| spin_lock_init(&acl->stats_lock); |
| acl->dynamic_node_acl = 1; |
| |
| tpg->se_tpg_tfo->set_default_node_attributes(acl); |
| |
| if (core_create_device_list_for_node(acl) < 0) { |
| tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl); |
| return NULL; |
| } |
| |
| if (core_set_queue_depth_for_node(tpg, acl) < 0) { |
| core_free_device_list_for_node(acl, tpg); |
| tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl); |
| return NULL; |
| } |
| /* |
| * 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); |
| |
| spin_lock_irq(&tpg->acl_node_lock); |
| list_add_tail(&acl->acl_list, &tpg->acl_node_list); |
| tpg->num_node_acls++; |
| spin_unlock_irq(&tpg->acl_node_lock); |
| |
| pr_debug("%s_TPG[%u] - Added DYNAMIC 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(), initiatorname); |
| |
| 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(); |
| } |
| |
| void core_tpg_clear_object_luns(struct se_portal_group *tpg) |
| { |
| int i; |
| struct se_lun *lun; |
| |
| spin_lock(&tpg->tpg_lun_lock); |
| for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { |
| lun = tpg->tpg_lun_list[i]; |
| |
| if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) || |
| (lun->lun_se_dev == NULL)) |
| continue; |
| |
| spin_unlock(&tpg->tpg_lun_lock); |
| core_dev_del_lun(tpg, lun->unpacked_lun); |
| spin_lock(&tpg->tpg_lun_lock); |
| } |
| spin_unlock(&tpg->tpg_lun_lock); |
| } |
| EXPORT_SYMBOL(core_tpg_clear_object_luns); |
| |
| /* core_tpg_add_initiator_node_acl(): |
| * |
| * |
| */ |
| struct se_node_acl *core_tpg_add_initiator_node_acl( |
| struct se_portal_group *tpg, |
| struct se_node_acl *se_nacl, |
| const char *initiatorname, |
| u32 queue_depth) |
| { |
| struct se_node_acl *acl = NULL; |
| |
| spin_lock_irq(&tpg->acl_node_lock); |
| 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); |
| spin_unlock_irq(&tpg->acl_node_lock); |
| /* |
| * Release the locally allocated struct se_node_acl |
| * because * core_tpg_add_initiator_node_acl() returned |
| * a pointer to an existing demo mode node ACL. |
| */ |
| if (se_nacl) |
| tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, |
| se_nacl); |
| goto done; |
| } |
| |
| 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)); |
| spin_unlock_irq(&tpg->acl_node_lock); |
| return ERR_PTR(-EEXIST); |
| } |
| spin_unlock_irq(&tpg->acl_node_lock); |
| |
| if (!se_nacl) { |
| pr_err("struct se_node_acl pointer is NULL\n"); |
| return ERR_PTR(-EINVAL); |
| } |
| /* |
| * For v4.x logic the se_node_acl_s is hanging off a fabric |
| * dependent structure allocated via |
| * struct target_core_fabric_ops->fabric_make_nodeacl() |
| */ |
| acl = se_nacl; |
| |
| INIT_LIST_HEAD(&acl->acl_list); |
| INIT_LIST_HEAD(&acl->acl_sess_list); |
| kref_init(&acl->acl_kref); |
| init_completion(&acl->acl_free_comp); |
| spin_lock_init(&acl->device_list_lock); |
| spin_lock_init(&acl->nacl_sess_lock); |
| atomic_set(&acl->acl_pr_ref_count, 0); |
| acl->queue_depth = 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); |
| spin_lock_init(&acl->stats_lock); |
| |
| tpg->se_tpg_tfo->set_default_node_attributes(acl); |
| |
| if (core_create_device_list_for_node(acl) < 0) { |
| tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| if (core_set_queue_depth_for_node(tpg, acl) < 0) { |
| core_free_device_list_for_node(acl, tpg); |
| tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| spin_lock_irq(&tpg->acl_node_lock); |
| list_add_tail(&acl->acl_list, &tpg->acl_node_list); |
| tpg->num_node_acls++; |
| spin_unlock_irq(&tpg->acl_node_lock); |
| |
| done: |
| pr_debug("%s_TPG[%hu] - Added 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(), initiatorname); |
| |
| return acl; |
| } |
| EXPORT_SYMBOL(core_tpg_add_initiator_node_acl); |
| |
| /* core_tpg_del_initiator_node_acl(): |
| * |
| * |
| */ |
| int core_tpg_del_initiator_node_acl( |
| struct se_portal_group *tpg, |
| struct se_node_acl *acl, |
| int force) |
| { |
| LIST_HEAD(sess_list); |
| struct se_session *sess, *sess_tmp; |
| unsigned long flags; |
| int rc; |
| |
| spin_lock_irq(&tpg->acl_node_lock); |
| if (acl->dynamic_node_acl) { |
| acl->dynamic_node_acl = 0; |
| } |
| list_del(&acl->acl_list); |
| tpg->num_node_acls--; |
| spin_unlock_irq(&tpg->acl_node_lock); |
| |
| spin_lock_irqsave(&acl->nacl_sess_lock, flags); |
| acl->acl_stop = 1; |
| |
| list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list, |
| sess_acl_list) { |
| if (sess->sess_tearing_down != 0) |
| continue; |
| |
| target_get_session(sess); |
| list_move(&sess->sess_acl_list, &sess_list); |
| } |
| spin_unlock_irqrestore(&acl->nacl_sess_lock, flags); |
| |
| list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) { |
| list_del(&sess->sess_acl_list); |
| |
| rc = tpg->se_tpg_tfo->shutdown_session(sess); |
| target_put_session(sess); |
| if (!rc) |
| continue; |
| target_put_session(sess); |
| } |
| 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_clear_initiator_node_from_tpg(acl, tpg); |
| 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); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(core_tpg_del_initiator_node_acl); |
| |
| /* core_tpg_set_initiator_node_queue_depth(): |
| * |
| * |
| */ |
| int core_tpg_set_initiator_node_queue_depth( |
| struct se_portal_group *tpg, |
| unsigned char *initiatorname, |
| u32 queue_depth, |
| int force) |
| { |
| struct se_session *sess, *init_sess = NULL; |
| struct se_node_acl *acl; |
| unsigned long flags; |
| int dynamic_acl = 0; |
| |
| spin_lock_irq(&tpg->acl_node_lock); |
| acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); |
| if (!acl) { |
| pr_err("Access Control List entry for %s Initiator" |
| " Node %s does not exists for TPG %hu, ignoring" |
| " request.\n", tpg->se_tpg_tfo->get_fabric_name(), |
| initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| spin_unlock_irq(&tpg->acl_node_lock); |
| return -ENODEV; |
| } |
| if (acl->dynamic_node_acl) { |
| acl->dynamic_node_acl = 0; |
| dynamic_acl = 1; |
| } |
| spin_unlock_irq(&tpg->acl_node_lock); |
| |
| spin_lock_irqsave(&tpg->session_lock, flags); |
| list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) { |
| if (sess->se_node_acl != acl) |
| continue; |
| |
| if (!force) { |
| pr_err("Unable to change queue depth for %s" |
| " Initiator Node: %s while session is" |
| " operational. To forcefully change the queue" |
| " depth and force session reinstatement" |
| " use the \"force=1\" parameter.\n", |
| tpg->se_tpg_tfo->get_fabric_name(), initiatorname); |
| spin_unlock_irqrestore(&tpg->session_lock, flags); |
| |
| spin_lock_irq(&tpg->acl_node_lock); |
| if (dynamic_acl) |
| acl->dynamic_node_acl = 1; |
| spin_unlock_irq(&tpg->acl_node_lock); |
| return -EEXIST; |
| } |
| /* |
| * Determine if the session needs to be closed by our context. |
| */ |
| if (!tpg->se_tpg_tfo->shutdown_session(sess)) |
| continue; |
| |
| init_sess = sess; |
| break; |
| } |
| |
| /* |
| * 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 |
| * core_set_queue_depth_for_node() to add the requested queue depth. |
| * |
| * Finally call tpg->se_tpg_tfo->close_session() to force session |
| * reinstatement to occur if there is an active session for the |
| * $FABRIC_MOD Initiator Node in question. |
| */ |
| acl->queue_depth = queue_depth; |
| |
| if (core_set_queue_depth_for_node(tpg, acl) < 0) { |
| spin_unlock_irqrestore(&tpg->session_lock, flags); |
| /* |
| * Force session reinstatement if |
| * core_set_queue_depth_for_node() failed, because we assume |
| * the $FABRIC_MOD has already the set session reinstatement |
| * bit from tpg->se_tpg_tfo->shutdown_session() called above. |
| */ |
| if (init_sess) |
| tpg->se_tpg_tfo->close_session(init_sess); |
| |
| spin_lock_irq(&tpg->acl_node_lock); |
| if (dynamic_acl) |
| acl->dynamic_node_acl = 1; |
| spin_unlock_irq(&tpg->acl_node_lock); |
| return -EINVAL; |
| } |
| spin_unlock_irqrestore(&tpg->session_lock, flags); |
| /* |
| * If the $FABRIC_MOD session for the Initiator Node ACL exists, |
| * forcefully shutdown the $FABRIC_MOD session/nexus. |
| */ |
| if (init_sess) |
| tpg->se_tpg_tfo->close_session(init_sess); |
| |
| pr_debug("Successfully changed queue depth to: %d for Initiator" |
| " Node: %s on %s Target Portal Group: %u\n", queue_depth, |
| initiatorname, tpg->se_tpg_tfo->get_fabric_name(), |
| tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| |
| spin_lock_irq(&tpg->acl_node_lock); |
| if (dynamic_acl) |
| acl->dynamic_node_acl = 1; |
| spin_unlock_irq(&tpg->acl_node_lock); |
| |
| 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); |
| } |
| |
| static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg) |
| { |
| /* Set in core_dev_setup_virtual_lun0() */ |
| struct se_device *dev = g_lun0_dev; |
| struct se_lun *lun = &se_tpg->tpg_virt_lun0; |
| u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY; |
| int ret; |
| |
| lun->unpacked_lun = 0; |
| lun->lun_status = TRANSPORT_LUN_STATUS_FREE; |
| atomic_set(&lun->lun_acl_count, 0); |
| init_completion(&lun->lun_shutdown_comp); |
| INIT_LIST_HEAD(&lun->lun_acl_list); |
| INIT_LIST_HEAD(&lun->lun_cmd_list); |
| spin_lock_init(&lun->lun_acl_lock); |
| spin_lock_init(&lun->lun_cmd_lock); |
| spin_lock_init(&lun->lun_sep_lock); |
| init_completion(&lun->lun_ref_comp); |
| |
| ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release); |
| if (ret < 0) |
| return ret; |
| |
| ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev); |
| if (ret < 0) { |
| percpu_ref_cancel_init(&lun->lun_ref); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg) |
| { |
| struct se_lun *lun = &se_tpg->tpg_virt_lun0; |
| |
| core_tpg_post_dellun(se_tpg, lun); |
| } |
| |
| int core_tpg_register( |
| struct target_core_fabric_ops *tfo, |
| struct se_wwn *se_wwn, |
| struct se_portal_group *se_tpg, |
| void *tpg_fabric_ptr, |
| int se_tpg_type) |
| { |
| struct se_lun *lun; |
| u32 i; |
| |
| se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG, |
| sizeof(struct se_lun), GFP_KERNEL); |
| if (!se_tpg->tpg_lun_list) { |
| pr_err("Unable to allocate struct se_portal_group->" |
| "tpg_lun_list\n"); |
| return -ENOMEM; |
| } |
| |
| for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { |
| lun = se_tpg->tpg_lun_list[i]; |
| lun->unpacked_lun = i; |
| lun->lun_link_magic = SE_LUN_LINK_MAGIC; |
| lun->lun_status = TRANSPORT_LUN_STATUS_FREE; |
| atomic_set(&lun->lun_acl_count, 0); |
| init_completion(&lun->lun_shutdown_comp); |
| INIT_LIST_HEAD(&lun->lun_acl_list); |
| INIT_LIST_HEAD(&lun->lun_cmd_list); |
| spin_lock_init(&lun->lun_acl_lock); |
| spin_lock_init(&lun->lun_cmd_lock); |
| spin_lock_init(&lun->lun_sep_lock); |
| init_completion(&lun->lun_ref_comp); |
| } |
| |
| se_tpg->se_tpg_type = se_tpg_type; |
| se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr; |
| se_tpg->se_tpg_tfo = tfo; |
| 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->acl_node_lock); |
| spin_lock_init(&se_tpg->session_lock); |
| spin_lock_init(&se_tpg->tpg_lun_lock); |
| |
| if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) { |
| if (core_tpg_setup_virtual_lun0(se_tpg) < 0) { |
| array_free(se_tpg->tpg_lun_list, |
| TRANSPORT_MAX_LUNS_PER_TPG); |
| return -ENOMEM; |
| } |
| } |
| |
| 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 %s struct se_portal_group for" |
| " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(), |
| (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ? |
| "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ? |
| "None" : tfo->tpg_get_wwn(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) |
| { |
| struct se_node_acl *nacl, *nacl_tmp; |
| |
| pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group" |
| " for endpoint: %s Portal Tag %u\n", |
| (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ? |
| "Normal" : "Discovery", 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_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(); |
| /* |
| * 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(). |
| */ |
| spin_lock_irq(&se_tpg->acl_node_lock); |
| list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list, |
| acl_list) { |
| list_del(&nacl->acl_list); |
| se_tpg->num_node_acls--; |
| spin_unlock_irq(&se_tpg->acl_node_lock); |
| |
| core_tpg_wait_for_nacl_pr_ref(nacl); |
| core_free_device_list_for_node(nacl, se_tpg); |
| se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl); |
| |
| spin_lock_irq(&se_tpg->acl_node_lock); |
| } |
| spin_unlock_irq(&se_tpg->acl_node_lock); |
| |
| if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) |
| core_tpg_release_virtual_lun0(se_tpg); |
| |
| se_tpg->se_tpg_fabric_ptr = NULL; |
| array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG); |
| return 0; |
| } |
| EXPORT_SYMBOL(core_tpg_deregister); |
| |
| struct se_lun *core_tpg_pre_addlun( |
| struct se_portal_group *tpg, |
| u32 unpacked_lun) |
| { |
| struct se_lun *lun; |
| |
| if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) { |
| pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG" |
| "-1: %u for Target Portal Group: %u\n", |
| tpg->se_tpg_tfo->get_fabric_name(), |
| unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1, |
| tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| return ERR_PTR(-EOVERFLOW); |
| } |
| |
| spin_lock(&tpg->tpg_lun_lock); |
| lun = tpg->tpg_lun_list[unpacked_lun]; |
| if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) { |
| pr_err("TPG Logical Unit Number: %u is already active" |
| " on %s Target Portal Group: %u, ignoring request.\n", |
| unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(), |
| tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| spin_unlock(&tpg->tpg_lun_lock); |
| return ERR_PTR(-EINVAL); |
| } |
| spin_unlock(&tpg->tpg_lun_lock); |
| |
| return lun; |
| } |
| |
| int core_tpg_post_addlun( |
| struct se_portal_group *tpg, |
| struct se_lun *lun, |
| u32 lun_access, |
| void *lun_ptr) |
| { |
| int ret; |
| |
| ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release); |
| if (ret < 0) |
| return ret; |
| |
| ret = core_dev_export(lun_ptr, tpg, lun); |
| if (ret < 0) { |
| percpu_ref_cancel_init(&lun->lun_ref); |
| return ret; |
| } |
| |
| spin_lock(&tpg->tpg_lun_lock); |
| lun->lun_access = lun_access; |
| lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE; |
| spin_unlock(&tpg->tpg_lun_lock); |
| |
| return 0; |
| } |
| |
| static void core_tpg_shutdown_lun( |
| struct se_portal_group *tpg, |
| struct se_lun *lun) |
| { |
| core_clear_lun_from_tpg(lun, tpg); |
| transport_clear_lun_ref(lun); |
| } |
| |
| struct se_lun *core_tpg_pre_dellun( |
| struct se_portal_group *tpg, |
| u32 unpacked_lun) |
| { |
| struct se_lun *lun; |
| |
| if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) { |
| pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG" |
| "-1: %u for Target Portal Group: %u\n", |
| tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun, |
| TRANSPORT_MAX_LUNS_PER_TPG-1, |
| tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| return ERR_PTR(-EOVERFLOW); |
| } |
| |
| spin_lock(&tpg->tpg_lun_lock); |
| lun = tpg->tpg_lun_list[unpacked_lun]; |
| if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) { |
| pr_err("%s Logical Unit Number: %u is not active on" |
| " Target Portal Group: %u, ignoring request.\n", |
| tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun, |
| tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
| spin_unlock(&tpg->tpg_lun_lock); |
| return ERR_PTR(-ENODEV); |
| } |
| spin_unlock(&tpg->tpg_lun_lock); |
| |
| return lun; |
| } |
| |
| int core_tpg_post_dellun( |
| struct se_portal_group *tpg, |
| struct se_lun *lun) |
| { |
| core_tpg_shutdown_lun(tpg, lun); |
| |
| core_dev_unexport(lun->lun_se_dev, tpg, lun); |
| |
| spin_lock(&tpg->tpg_lun_lock); |
| lun->lun_status = TRANSPORT_LUN_STATUS_FREE; |
| spin_unlock(&tpg->tpg_lun_lock); |
| |
| return 0; |
| } |