| /******************************************************************************* |
| * 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 <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/delay.h> |
| #include <linux/timer.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/kthread.h> |
| #include <linux/in.h> |
| #include <linux/export.h> |
| #include <asm/unaligned.h> |
| #include <net/sock.h> |
| #include <net/tcp.h> |
| #include <scsi/scsi_common.h> |
| #include <scsi/scsi_proto.h> |
| |
| #include <target/target_core_base.h> |
| #include <target/target_core_backend.h> |
| #include <target/target_core_fabric.h> |
| |
| #include "target_core_internal.h" |
| #include "target_core_alua.h" |
| #include "target_core_pr.h" |
| #include "target_core_ua.h" |
| |
| DEFINE_MUTEX(g_device_mutex); |
| LIST_HEAD(g_device_list); |
| |
| 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, u64 unpacked_lun) |
| { |
| 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, unpacked_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); |
| |
| se_lun = rcu_dereference(deve->se_lun); |
| se_cmd->se_lun = rcu_dereference(deve->se_lun); |
| se_cmd->pr_res_key = deve->pr_res_key; |
| se_cmd->orig_fe_lun = unpacked_lun; |
| se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; |
| |
| percpu_ref_get(&se_lun->lun_ref); |
| se_cmd->lun_ref_active = true; |
| |
| 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->get_fabric_name(), |
| unpacked_lun); |
| rcu_read_unlock(); |
| ret = TCM_WRITE_PROTECTED; |
| goto ref_dev; |
| } |
| } |
| 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 (unpacked_lun != 0) { |
| pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN" |
| " Access for 0x%08llx\n", |
| se_cmd->se_tfo->get_fabric_name(), |
| unpacked_lun); |
| return TCM_NON_EXISTENT_LUN; |
| } |
| |
| se_lun = se_sess->se_tpg->tpg_virt_lun0; |
| se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0; |
| se_cmd->orig_fe_lun = 0; |
| se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; |
| |
| percpu_ref_get(&se_lun->lun_ref); |
| se_cmd->lun_ref_active = true; |
| |
| /* |
| * Force WRITE PROTECT for virtual LUN 0 |
| */ |
| if ((se_cmd->data_direction != DMA_FROM_DEVICE) && |
| (se_cmd->data_direction != DMA_NONE)) { |
| ret = TCM_WRITE_PROTECTED; |
| goto ref_dev; |
| } |
| } |
| /* |
| * 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 |
| */ |
| ref_dev: |
| 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, u64 unpacked_lun) |
| { |
| 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, unpacked_lun); |
| if (deve) { |
| se_tmr->tmr_lun = rcu_dereference(deve->se_lun); |
| se_cmd->se_lun = rcu_dereference(deve->se_lun); |
| se_lun = rcu_dereference(deve->se_lun); |
| se_cmd->pr_res_key = deve->pr_res_key; |
| se_cmd->orig_fe_lun = unpacked_lun; |
| } |
| rcu_read_unlock(); |
| |
| if (!se_lun) { |
| pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN" |
| " Access for 0x%08llx\n", |
| se_cmd->se_tfo->get_fabric_name(), |
| unpacked_lun); |
| return -ENODEV; |
| } |
| /* |
| * XXX: Add percpu se_lun->lun_ref reference count for TMR |
| */ |
| 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 = rcu_dereference(deve->se_lun); |
| if (!lun) { |
| pr_err("%s device entries device pointer is" |
| " NULL, but Initiator has access.\n", |
| tpg->se_tpg_tfo->get_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) { |
| struct se_lun *lun = rcu_dereference_check(deve->se_lun, |
| lockdep_is_held(&nacl->lun_entry_mutex)); |
| core_disable_device_list_for_node(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; |
| } |
| |
| atomic_set(&new->ua_count, 0); |
| 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 = rcu_dereference_check(orig->se_lun, |
| lockdep_is_held(&nacl->lun_entry_mutex)); |
| |
| 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; |
| } |
| |
| rcu_assign_pointer(new->se_lun, lun); |
| rcu_assign_pointer(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; |
| } |
| |
| rcu_assign_pointer(new->se_lun, lun); |
| rcu_assign_pointer(new->se_lun_acl, lun_acl); |
| hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist); |
| 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; |
| } |
| |
| /* |
| * Called with se_node_acl->lun_entry_mutex held. |
| */ |
| 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); |
| /* |
| * If the MappedLUN entry is being disabled, the entry in |
| * lun->lun_deve_list must be removed now before clearing the |
| * struct se_dev_entry pointers below as logic in |
| * core_alua_do_transition_tg_pt() depends on these being present. |
| * |
| * deve->se_lun_acl will be NULL for demo-mode created LUNs |
| * that have not been explicitly converted to MappedLUNs -> |
| * struct se_lun_acl, but we remove deve->lun_link from |
| * lun->lun_deve_list. This also means that active UAs and |
| * NodeACL context specific PR metadata for demo-mode |
| * MappedLUN *deve will be released below.. |
| */ |
| spin_lock(&lun->lun_deve_lock); |
| list_del(&orig->lun_link); |
| spin_unlock(&lun->lun_deve_lock); |
| /* |
| * Disable struct se_dev_entry LUN ACL mapping |
| */ |
| core_scsi3_ua_release_all(orig); |
| |
| hlist_del_rcu(&orig->link); |
| clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags); |
| orig->lun_access_ro = false; |
| orig->creation_time = 0; |
| orig->attach_count--; |
| /* |
| * Before firing off RCU callback, wait for any in process SPEC_I_PT=1 |
| * or REGISTER_AND_MOVE PR operation to complete. |
| */ |
| kref_put(&orig->pr_kref, target_pr_kref_release); |
| wait_for_completion(&orig->pr_comp); |
| |
| rcu_assign_pointer(orig->se_lun, NULL); |
| rcu_assign_pointer(orig->se_lun_acl, NULL); |
| |
| kfree_rcu(orig, rcu_head); |
| |
| core_scsi3_free_pr_reg_from_nacl(dev, nacl); |
| target_luns_data_has_changed(nacl, NULL, false); |
| } |
| |
| /* core_clear_lun_from_tpg(): |
| * |
| * |
| */ |
| void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg) |
| { |
| struct se_node_acl *nacl; |
| struct se_dev_entry *deve; |
| |
| mutex_lock(&tpg->acl_node_mutex); |
| list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) { |
| |
| mutex_lock(&nacl->lun_entry_mutex); |
| hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { |
| struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun, |
| lockdep_is_held(&nacl->lun_entry_mutex)); |
| |
| if (lun != tmp_lun) |
| continue; |
| |
| core_disable_device_list_for_node(lun, deve, nacl, tpg); |
| } |
| mutex_unlock(&nacl->lun_entry_mutex); |
| } |
| mutex_unlock(&tpg->acl_node_mutex); |
| } |
| |
| int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev) |
| { |
| struct se_lun *tmp; |
| |
| spin_lock(&dev->se_port_lock); |
| if (dev->export_count == 0x0000ffff) { |
| pr_warn("Reached dev->dev_port_count ==" |
| " 0x0000ffff\n"); |
| spin_unlock(&dev->se_port_lock); |
| return -ENOSPC; |
| } |
| again: |
| /* |
| * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device |
| * Here is the table from spc4r17 section 7.7.3.8. |
| * |
| * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field |
| * |
| * Code Description |
| * 0h Reserved |
| * 1h Relative port 1, historically known as port A |
| * 2h Relative port 2, historically known as port B |
| * 3h to FFFFh Relative port 3 through 65 535 |
| */ |
| lun->lun_rtpi = dev->dev_rpti_counter++; |
| if (!lun->lun_rtpi) |
| goto again; |
| |
| list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) { |
| /* |
| * Make sure RELATIVE TARGET PORT IDENTIFIER is unique |
| * for 16-bit wrap.. |
| */ |
| if (lun->lun_rtpi == tmp->lun_rtpi) |
| goto again; |
| } |
| spin_unlock(&dev->se_port_lock); |
| |
| return 0; |
| } |
| |
| static void se_release_vpd_for_dev(struct se_device *dev) |
| { |
| struct t10_vpd *vpd, *vpd_tmp; |
| |
| spin_lock(&dev->t10_wwn.t10_vpd_lock); |
| list_for_each_entry_safe(vpd, vpd_tmp, |
| &dev->t10_wwn.t10_vpd_list, vpd_list) { |
| list_del(&vpd->vpd_list); |
| kfree(vpd); |
| } |
| spin_unlock(&dev->t10_wwn.t10_vpd_lock); |
| } |
| |
| static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size) |
| { |
| u32 aligned_max_sectors; |
| u32 alignment; |
| /* |
| * Limit max_sectors to a PAGE_SIZE aligned value for modern |
| * transport_allocate_data_tasks() operation. |
| */ |
| alignment = max(1ul, PAGE_SIZE / block_size); |
| aligned_max_sectors = rounddown(max_sectors, alignment); |
| |
| if (max_sectors != aligned_max_sectors) |
| pr_info("Rounding down aligned max_sectors from %u to %u\n", |
| max_sectors, aligned_max_sectors); |
| |
| return aligned_max_sectors; |
| } |
| |
| int core_dev_add_lun( |
| struct se_portal_group *tpg, |
| struct se_device *dev, |
| struct se_lun *lun) |
| { |
| int rc; |
| |
| rc = core_tpg_add_lun(tpg, lun, false, dev); |
| if (rc < 0) |
| return rc; |
| |
| pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from" |
| " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(), |
| tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, |
| tpg->se_tpg_tfo->get_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->get_fabric_name(), |
| tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, |
| tpg->se_tpg_tfo->get_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->get_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->get_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->get_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->get_fabric_name(), |
| tpg->se_tpg_tfo->tpg_get_tag(tpg), |
| tpg->se_tpg_tfo->get_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; |
| char buf[17]; |
| int i, device_type; |
| /* |
| * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer |
| */ |
| for (i = 0; i < 8; i++) |
| if (wwn->vendor[i] >= 0x20) |
| buf[i] = wwn->vendor[i]; |
| else |
| buf[i] = ' '; |
| buf[i] = '\0'; |
| pr_debug(" Vendor: %s\n", buf); |
| |
| for (i = 0; i < 16; i++) |
| if (wwn->model[i] >= 0x20) |
| buf[i] = wwn->model[i]; |
| else |
| buf[i] = ' '; |
| buf[i] = '\0'; |
| pr_debug(" Model: %s\n", buf); |
| |
| for (i = 0; i < 4; i++) |
| if (wwn->revision[i] >= 0x20) |
| buf[i] = wwn->revision[i]; |
| else |
| buf[i] = ' '; |
| buf[i] = '\0'; |
| pr_debug(" Revision: %s\n", buf); |
| |
| device_type = dev->transport->get_device_type(dev); |
| 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; |
| |
| dev = hba->backend->ops->alloc_device(hba, name); |
| if (!dev) |
| return NULL; |
| |
| dev->dev_link_magic = SE_DEV_LINK_MAGIC; |
| dev->se_hba = hba; |
| dev->transport = hba->backend->ops; |
| dev->prot_length = sizeof(struct t10_pi_tuple); |
| dev->hba_index = hba->hba_index; |
| |
| INIT_LIST_HEAD(&dev->dev_list); |
| 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->state_list); |
| INIT_LIST_HEAD(&dev->qf_cmd_list); |
| INIT_LIST_HEAD(&dev->g_dev_node); |
| spin_lock_init(&dev->execute_task_lock); |
| spin_lock_init(&dev->delayed_cmd_lock); |
| spin_lock_init(&dev->dev_reservation_lock); |
| spin_lock_init(&dev->se_port_lock); |
| spin_lock_init(&dev->se_tmr_lock); |
| spin_lock_init(&dev->qf_cmd_lock); |
| sema_init(&dev->caw_sem, 1); |
| INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list); |
| spin_lock_init(&dev->t10_wwn.t10_vpd_lock); |
| INIT_LIST_HEAD(&dev->t10_pr.registration_list); |
| INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list); |
| spin_lock_init(&dev->t10_pr.registration_lock); |
| spin_lock_init(&dev->t10_pr.aptpl_reg_lock); |
| INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list); |
| spin_lock_init(&dev->t10_alua.tg_pt_gps_lock); |
| INIT_LIST_HEAD(&dev->t10_alua.lba_map_list); |
| spin_lock_init(&dev->t10_alua.lba_map_lock); |
| |
| dev->t10_wwn.t10_dev = dev; |
| dev->t10_alua.t10_dev = dev; |
| |
| dev->dev_attrib.da_dev = dev; |
| dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS; |
| dev->dev_attrib.emulate_dpo = 1; |
| dev->dev_attrib.emulate_fua_write = 1; |
| dev->dev_attrib.emulate_fua_read = 1; |
| dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE; |
| dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL; |
| 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.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_ref_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; |
| |
| return dev; |
| } |
| |
| /* |
| * Check if the underlying struct block_device request_queue supports |
| * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM |
| * in ATA and we need to set TPE=1 |
| */ |
| bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib, |
| struct request_queue *q) |
| { |
| int block_size = queue_logical_block_size(q); |
| |
| if (!blk_queue_discard(q)) |
| return false; |
| |
| attrib->max_unmap_lba_count = |
| q->limits.max_discard_sectors >> (ilog2(block_size) - 9); |
| /* |
| * Currently hardcoded to 1 in Linux/SCSI code.. |
| */ |
| attrib->max_unmap_block_desc_count = 1; |
| attrib->unmap_granularity = q->limits.discard_granularity / block_size; |
| attrib->unmap_granularity_alignment = q->limits.discard_alignment / |
| block_size; |
| attrib->unmap_zeroes_data = q->limits.discard_zeroes_data; |
| 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); |
| |
| int target_configure_device(struct se_device *dev) |
| { |
| struct se_hba *hba = dev->se_hba; |
| int ret; |
| |
| if (dev->dev_flags & DF_CONFIGURED) { |
| pr_err("se_dev->se_dev_ptr already set for storage" |
| " object\n"); |
| return -EEXIST; |
| } |
| |
| ret = dev->transport->configure_device(dev); |
| if (ret) |
| goto out; |
| /* |
| * 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->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); |
| dev->creation_time = get_jiffies_64(); |
| |
| ret = core_setup_alua(dev); |
| if (ret) |
| goto out; |
| |
| /* |
| * Startup the struct se_device processing thread |
| */ |
| dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1, |
| dev->transport->name); |
| if (!dev->tmr_wq) { |
| pr_err("Unable to create tmr workqueue for %s\n", |
| dev->transport->name); |
| ret = -ENOMEM; |
| goto out_free_alua; |
| } |
| |
| /* |
| * Setup work_queue for QUEUE_FULL |
| */ |
| INIT_WORK(&dev->qf_work_queue, target_qf_do_work); |
| |
| /* |
| * Preload the initial INQUIRY const values if we are doing |
| * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI |
| * passthrough because this is being provided by the backend LLD. |
| */ |
| if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) { |
| strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8); |
| strncpy(&dev->t10_wwn.model[0], |
| dev->transport->inquiry_prod, 16); |
| strncpy(&dev->t10_wwn.revision[0], |
| dev->transport->inquiry_rev, 4); |
| } |
| |
| scsi_dump_inquiry(dev); |
| |
| spin_lock(&hba->device_lock); |
| hba->dev_count++; |
| spin_unlock(&hba->device_lock); |
| |
| mutex_lock(&g_device_mutex); |
| list_add_tail(&dev->g_dev_node, &g_device_list); |
| mutex_unlock(&g_device_mutex); |
| |
| dev->dev_flags |= DF_CONFIGURED; |
| |
| return 0; |
| |
| out_free_alua: |
| core_alua_free_lu_gp_mem(dev); |
| 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 (dev->dev_flags & DF_CONFIGURED) { |
| destroy_workqueue(dev->tmr_wq); |
| |
| mutex_lock(&g_device_mutex); |
| list_del(&dev->g_dev_node); |
| mutex_unlock(&g_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); |
| |
| dev->transport->free_device(dev); |
| } |
| |
| int core_dev_setup_virtual_lun0(void) |
| { |
| struct se_hba *hba; |
| struct se_device *dev; |
| char buf[] = "rd_pages=8,rd_nullio=1"; |
| int ret; |
| |
| hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE); |
| if (IS_ERR(hba)) |
| return PTR_ERR(hba); |
| |
| dev = target_alloc_device(hba, "virt_lun0"); |
| if (!dev) { |
| ret = -ENOMEM; |
| goto out_free_hba; |
| } |
| |
| hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf)); |
| |
| ret = target_configure_device(dev); |
| if (ret) |
| goto out_free_se_dev; |
| |
| lun0_hba = hba; |
| g_lun0_dev = dev; |
| return 0; |
| |
| out_free_se_dev: |
| target_free_device(dev); |
| out_free_hba: |
| core_delete_hba(hba); |
| return ret; |
| } |
| |
| |
| void core_dev_release_virtual_lun0(void) |
| { |
| struct se_hba *hba = lun0_hba; |
| |
| if (!hba) |
| return; |
| |
| if (g_lun0_dev) |
| target_free_device(g_lun0_dev); |
| core_delete_hba(hba); |
| } |
| |
| /* |
| * Common CDB parsing for kernel and user passthrough. |
| */ |
| sense_reason_t |
| passthrough_parse_cdb(struct se_cmd *cmd, |
| sense_reason_t (*exec_cmd)(struct se_cmd *cmd)) |
| { |
| unsigned char *cdb = cmd->t_task_cdb; |
| |
| /* |
| * Clear a lun set in the cdb if the initiator talking to use spoke |
| * and old standards version, as we can't assume the underlying device |
| * won't choke up on it. |
| */ |
| switch (cdb[0]) { |
| case READ_10: /* SBC - RDProtect */ |
| case READ_12: /* SBC - RDProtect */ |
| case READ_16: /* SBC - RDProtect */ |
| case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */ |
| case VERIFY: /* SBC - VRProtect */ |
| case VERIFY_16: /* SBC - VRProtect */ |
| case WRITE_VERIFY: /* SBC - VRProtect */ |
| case WRITE_VERIFY_12: /* SBC - VRProtect */ |
| case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */ |
| break; |
| default: |
| cdb[1] &= 0x1f; /* clear logical unit number */ |
| break; |
| } |
| |
| /* |
| * 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; |
| } |
| |
| /* 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 0x8e: /* 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 0x0c: /* 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); |