diff options
Diffstat (limited to 'drivers/target/target_core_tpg.c')
| -rw-r--r-- | drivers/target/target_core_tpg.c | 826 |
1 files changed, 826 insertions, 0 deletions
diff --git a/drivers/target/target_core_tpg.c b/drivers/target/target_core_tpg.c new file mode 100644 index 000000000000..abfa81a57115 --- /dev/null +++ b/drivers/target/target_core_tpg.c @@ -0,0 +1,826 @@ +/******************************************************************************* + * Filename: target_core_tpg.c + * + * This file contains generic Target Portal Group related functions. + * + * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. + * Copyright (c) 2005, 2006, 2007 SBE, Inc. + * Copyright (c) 2007-2010 Rising Tide Systems + * Copyright (c) 2008-2010 Linux-iSCSI.org + * + * 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/smp_lock.h> +#include <linux/in.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_device.h> +#include <target/target_core_tpg.h> +#include <target/target_core_transport.h> +#include <target/target_core_fabric_ops.h> + +#include "target_core_hba.h" + +/* 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; + struct se_lun_acl *acl, *acl_tmp; + + 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) { + printk(KERN_ERR "%s device entries device pointer is" + " NULL, but Initiator has access.\n", + TPG_TFO(tpg)->get_fabric_name()); + continue; + } + + lun = deve->se_lun; + spin_unlock_irq(&nacl->device_list_lock); + core_update_device_list_for_node(lun, NULL, deve->mapped_lun, + TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0); + + spin_lock(&lun->lun_acl_lock); + list_for_each_entry_safe(acl, acl_tmp, + &lun->lun_acl_list, lacl_list) { + if (!(strcmp(acl->initiatorname, + nacl->initiatorname)) && + (acl->mapped_lun == deve->mapped_lun)) + break; + } + + if (!acl) { + printk(KERN_ERR "Unable to locate struct se_lun_acl for %s," + " mapped_lun: %u\n", nacl->initiatorname, + deve->mapped_lun); + spin_unlock(&lun->lun_acl_lock); + spin_lock_irq(&nacl->device_list_lock); + continue; + } + + list_del(&acl->lacl_list); + spin_unlock(&lun->lun_acl_lock); + + spin_lock_irq(&nacl->device_list_lock); + kfree(acl); + } + 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_bh(&tpg->acl_node_lock); + list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { + if (!(strcmp(acl->initiatorname, initiatorname)) && + (!(acl->dynamic_node_acl))) { + spin_unlock_bh(&tpg->acl_node_lock); + return acl; + } + } + spin_unlock_bh(&tpg->acl_node_lock); + + return NULL; +} + +/* 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_TFO(tpg)->tpg_check_demo_mode_write_protect(tpg))) { + if (dev->dev_flags & DF_READ_ONLY) + lun_access = TRANSPORT_LUNFLAGS_READ_ONLY; + else + lun_access = TRANSPORT_LUNFLAGS_READ_WRITE; + } else { + /* + * Allow only optical drives to issue R/W in default RO + * demo mode. + */ + if (TRANSPORT(dev)->get_device_type(dev) == TYPE_DISK) + lun_access = TRANSPORT_LUNFLAGS_READ_ONLY; + else + lun_access = TRANSPORT_LUNFLAGS_READ_WRITE; + } + + printk(KERN_INFO "TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s" + " access for LUN in Demo Mode\n", + TPG_TFO(tpg)->get_fabric_name(), + TPG_TFO(tpg)->tpg_get_tag(tpg), lun->unpacked_lun, + (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ? + "READ-WRITE" : "READ-ONLY"); + + core_update_device_list_for_node(lun, NULL, lun->unpacked_lun, + lun_access, acl, tpg, 1); + 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) { + printk(KERN_ERR "Queue depth for %s Initiator Node: %s is 0," + "defaulting to 1.\n", TPG_TFO(tpg)->get_fabric_name(), + acl->initiatorname); + acl->queue_depth = 1; + } + + return 0; +} + +/* 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 = kzalloc(sizeof(struct se_dev_entry) * + TRANSPORT_MAX_LUNS_PER_TPG, GFP_KERNEL); + if (!(nacl->device_list)) { + printk(KERN_ERR "Unable to allocate memory for" + " struct se_node_acl->device_list\n"); + return -1; + } + 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_TFO(tpg)->tpg_check_demo_mode(tpg))) + return NULL; + + acl = TPG_TFO(tpg)->tpg_alloc_fabric_acl(tpg); + if (!(acl)) + return NULL; + + INIT_LIST_HEAD(&acl->acl_list); + INIT_LIST_HEAD(&acl->acl_sess_list); + spin_lock_init(&acl->device_list_lock); + spin_lock_init(&acl->nacl_sess_lock); + atomic_set(&acl->acl_pr_ref_count, 0); + atomic_set(&acl->mib_ref_count, 0); + acl->queue_depth = TPG_TFO(tpg)->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_TFO(tpg)->set_default_node_attributes(acl); + + if (core_create_device_list_for_node(acl) < 0) { + TPG_TFO(tpg)->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_TFO(tpg)->tpg_release_fabric_acl(tpg, acl); + return NULL; + } + + core_tpg_add_node_to_devs(acl, tpg); + + spin_lock_bh(&tpg->acl_node_lock); + list_add_tail(&acl->acl_list, &tpg->acl_node_list); + tpg->num_node_acls++; + spin_unlock_bh(&tpg->acl_node_lock); + + printk("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s" + " Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(), + TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth, + TPG_TFO(tpg)->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_wait_for_mib_ref(struct se_node_acl *nacl) +{ + while (atomic_read(&nacl->mib_ref_count) != 0) + cpu_relax(); +} + +void core_tpg_clear_object_luns(struct se_portal_group *tpg) +{ + int i, ret; + 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); + ret = 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_bh(&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; + printk(KERN_INFO "%s_TPG[%u] - Replacing dynamic ACL" + " for %s\n", TPG_TFO(tpg)->get_fabric_name(), + TPG_TFO(tpg)->tpg_get_tag(tpg), initiatorname); + spin_unlock_bh(&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_TFO(tpg)->tpg_release_fabric_acl(tpg, + se_nacl); + goto done; + } + + printk(KERN_ERR "ACL entry for %s Initiator" + " Node %s already exists for TPG %u, ignoring" + " request.\n", TPG_TFO(tpg)->get_fabric_name(), + initiatorname, TPG_TFO(tpg)->tpg_get_tag(tpg)); + spin_unlock_bh(&tpg->acl_node_lock); + return ERR_PTR(-EEXIST); + } + spin_unlock_bh(&tpg->acl_node_lock); + + if (!(se_nacl)) { + printk("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); + 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_TFO(tpg)->set_default_node_attributes(acl); + + if (core_create_device_list_for_node(acl) < 0) { + TPG_TFO(tpg)->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_TFO(tpg)->tpg_release_fabric_acl(tpg, acl); + return ERR_PTR(-EINVAL); + } + + spin_lock_bh(&tpg->acl_node_lock); + list_add_tail(&acl->acl_list, &tpg->acl_node_list); + tpg->num_node_acls++; + spin_unlock_bh(&tpg->acl_node_lock); + +done: + printk(KERN_INFO "%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s" + " Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(), + TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth, + TPG_TFO(tpg)->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) +{ + struct se_session *sess, *sess_tmp; + int dynamic_acl = 0; + + spin_lock_bh(&tpg->acl_node_lock); + if (acl->dynamic_node_acl) { + acl->dynamic_node_acl = 0; + dynamic_acl = 1; + } + list_del(&acl->acl_list); + tpg->num_node_acls--; + spin_unlock_bh(&tpg->acl_node_lock); + + spin_lock_bh(&tpg->session_lock); + list_for_each_entry_safe(sess, sess_tmp, + &tpg->tpg_sess_list, sess_list) { + if (sess->se_node_acl != acl) + continue; + /* + * Determine if the session needs to be closed by our context. + */ + if (!(TPG_TFO(tpg)->shutdown_session(sess))) + continue; + + spin_unlock_bh(&tpg->session_lock); + /* + * If the $FABRIC_MOD session for the Initiator Node ACL exists, + * forcefully shutdown the $FABRIC_MOD session/nexus. + */ + TPG_TFO(tpg)->close_session(sess); + + spin_lock_bh(&tpg->session_lock); + } + spin_unlock_bh(&tpg->session_lock); + + core_tpg_wait_for_nacl_pr_ref(acl); + core_tpg_wait_for_mib_ref(acl); + core_clear_initiator_node_from_tpg(acl, tpg); + core_free_device_list_for_node(acl, tpg); + + printk(KERN_INFO "%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s" + " Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(), + TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth, + TPG_TFO(tpg)->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; + int dynamic_acl = 0; + + spin_lock_bh(&tpg->acl_node_lock); + acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); + if (!(acl)) { + printk(KERN_ERR "Access Control List entry for %s Initiator" + " Node %s does not exists for TPG %hu, ignoring" + " request.\n", TPG_TFO(tpg)->get_fabric_name(), + initiatorname, TPG_TFO(tpg)->tpg_get_tag(tpg)); + spin_unlock_bh(&tpg->acl_node_lock); + return -ENODEV; + } + if (acl->dynamic_node_acl) { + acl->dynamic_node_acl = 0; + dynamic_acl = 1; + } + spin_unlock_bh(&tpg->acl_node_lock); + + spin_lock_bh(&tpg->session_lock); + list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) { + if (sess->se_node_acl != acl) + continue; + + if (!force) { + printk(KERN_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_TFO(tpg)->get_fabric_name(), initiatorname); + spin_unlock_bh(&tpg->session_lock); + + spin_lock_bh(&tpg->acl_node_lock); + if (dynamic_acl) + acl->dynamic_node_acl = 1; + spin_unlock_bh(&tpg->acl_node_lock); + return -EEXIST; + } + /* + * Determine if the session needs to be closed by our context. + */ + if (!(TPG_TFO(tpg)->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_TFO(tpg)->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_bh(&tpg->session_lock); + /* + * 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_TFO(tpg)->shutdown_session() called above. + */ + if (init_sess) + TPG_TFO(tpg)->close_session(init_sess); + + spin_lock_bh(&tpg->acl_node_lock); + if (dynamic_acl) + acl->dynamic_node_acl = 1; + spin_unlock_bh(&tpg->acl_node_lock); + return -EINVAL; + } + spin_unlock_bh(&tpg->session_lock); + /* + * If the $FABRIC_MOD session for the Initiator Node ACL exists, + * forcefully shutdown the $FABRIC_MOD session/nexus. + */ + if (init_sess) + TPG_TFO(tpg)->close_session(init_sess); + + printk(KERN_INFO "Successfuly changed queue depth to: %d for Initiator" + " Node: %s on %s Target Portal Group: %u\n", queue_depth, + initiatorname, TPG_TFO(tpg)->get_fabric_name(), + TPG_TFO(tpg)->tpg_get_tag(tpg)); + + spin_lock_bh(&tpg->acl_node_lock); + if (dynamic_acl) + acl->dynamic_node_acl = 1; + spin_unlock_bh(&tpg->acl_node_lock); + + return 0; +} +EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth); + +static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg) +{ + /* Set in core_dev_setup_virtual_lun0() */ + struct se_device *dev = se_global->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); + + ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev); + if (ret < 0) + return -1; + + 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 = kzalloc((sizeof(struct se_lun) * + TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL); + if (!(se_tpg->tpg_lun_list)) { + printk(KERN_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_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); + } + + 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_list); + 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) { + kfree(se_tpg); + return -ENOMEM; + } + } + + spin_lock_bh(&se_global->se_tpg_lock); + list_add_tail(&se_tpg->se_tpg_list, &se_global->g_se_tpg_list); + spin_unlock_bh(&se_global->se_tpg_lock); + + printk(KERN_INFO "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) +{ + printk(KERN_INFO "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", TPG_TFO(se_tpg)->get_fabric_name(), + TPG_TFO(se_tpg)->tpg_get_wwn(se_tpg), + TPG_TFO(se_tpg)->tpg_get_tag(se_tpg)); + + spin_lock_bh(&se_global->se_tpg_lock); + list_del(&se_tpg->se_tpg_list); + spin_unlock_bh(&se_global->se_tpg_lock); + + while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0) + cpu_relax(); + + if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) + core_tpg_release_virtual_lun0(se_tpg); + + se_tpg->se_tpg_fabric_ptr = NULL; + kfree(se_tpg->tpg_lun_list); + 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)) { + printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG" + "-1: %u for Target Portal Group: %u\n", + TPG_TFO(tpg)->get_fabric_name(), + unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1, + TPG_TFO(tpg)->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) { + printk(KERN_ERR "TPG Logical Unit Number: %u is already active" + " on %s Target Portal Group: %u, ignoring request.\n", + unpacked_lun, TPG_TFO(tpg)->get_fabric_name(), + TPG_TFO(tpg)->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) +{ + if (core_dev_export(lun_ptr, tpg, lun) < 0) + return -1; + + 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_from_sessions(lun); +} + +struct se_lun *core_tpg_pre_dellun( + struct se_portal_group *tpg, + u32 unpacked_lun, + int *ret) +{ + struct se_lun *lun; + + if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) { + printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG" + "-1: %u for Target Portal Group: %u\n", + TPG_TFO(tpg)->get_fabric_name(), unpacked_lun, + TRANSPORT_MAX_LUNS_PER_TPG-1, + TPG_TFO(tpg)->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) { + printk(KERN_ERR "%s Logical Unit Number: %u is not active on" + " Target Portal Group: %u, ignoring request.\n", + TPG_TFO(tpg)->get_fabric_name(), unpacked_lun, + TPG_TFO(tpg)->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; +} |