diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/target/target_core_device.c | 1199 |
1 files changed, 1199 insertions, 0 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c new file mode 100644 index 000000000..301fe376a --- /dev/null +++ b/drivers/target/target_core_device.c @@ -0,0 +1,1199 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/******************************************************************************* + * Filename: target_core_device.c (based on iscsi_target_device.c) + * + * This file contains the TCM Virtual Device and Disk Transport + * agnostic related functions. + * + * (c) Copyright 2003-2013 Datera, Inc. + * + * Nicholas A. Bellinger <nab@kernel.org> + * + ******************************************************************************/ + +#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 <linux/t10-pi.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" + +static DEFINE_MUTEX(device_mutex); +static LIST_HEAD(device_list); +static DEFINE_IDR(devices_idr); + +static struct se_hba *lun0_hba; +/* not static, needed by tpg.c */ +struct se_device *g_lun0_dev; + +sense_reason_t +transport_lookup_cmd_lun(struct se_cmd *se_cmd) +{ + struct se_lun *se_lun = NULL; + struct se_session *se_sess = se_cmd->se_sess; + struct se_node_acl *nacl = se_sess->se_node_acl; + struct se_dev_entry *deve; + sense_reason_t ret = TCM_NO_SENSE; + + rcu_read_lock(); + deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun); + if (deve) { + atomic_long_inc(&deve->total_cmds); + + if (se_cmd->data_direction == DMA_TO_DEVICE) + atomic_long_add(se_cmd->data_length, + &deve->write_bytes); + else if (se_cmd->data_direction == DMA_FROM_DEVICE) + atomic_long_add(se_cmd->data_length, + &deve->read_bytes); + + if ((se_cmd->data_direction == DMA_TO_DEVICE) && + deve->lun_access_ro) { + pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN" + " Access for 0x%08llx\n", + se_cmd->se_tfo->fabric_name, + se_cmd->orig_fe_lun); + rcu_read_unlock(); + return TCM_WRITE_PROTECTED; + } + + se_lun = deve->se_lun; + + if (!percpu_ref_tryget_live(&se_lun->lun_ref)) { + se_lun = NULL; + goto out_unlock; + } + + se_cmd->se_lun = se_lun; + se_cmd->pr_res_key = deve->pr_res_key; + se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; + se_cmd->lun_ref_active = true; + } +out_unlock: + rcu_read_unlock(); + + if (!se_lun) { + /* + * Use the se_portal_group->tpg_virt_lun0 to allow for + * REPORT_LUNS, et al to be returned when no active + * MappedLUN=0 exists for this Initiator Port. + */ + if (se_cmd->orig_fe_lun != 0) { + pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN" + " Access for 0x%08llx from %s\n", + se_cmd->se_tfo->fabric_name, + se_cmd->orig_fe_lun, + nacl->initiatorname); + return TCM_NON_EXISTENT_LUN; + } + + /* + * Force WRITE PROTECT for virtual LUN 0 + */ + if ((se_cmd->data_direction != DMA_FROM_DEVICE) && + (se_cmd->data_direction != DMA_NONE)) + return TCM_WRITE_PROTECTED; + + se_lun = se_sess->se_tpg->tpg_virt_lun0; + if (!percpu_ref_tryget_live(&se_lun->lun_ref)) + return TCM_NON_EXISTENT_LUN; + + se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0; + se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; + se_cmd->lun_ref_active = true; + } + /* + * RCU reference protected by percpu se_lun->lun_ref taken above that + * must drop to zero (including initial reference) before this se_lun + * pointer can be kfree_rcu() by the final se_lun->lun_group put via + * target_core_fabric_configfs.c:target_fabric_port_release + */ + se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev); + atomic_long_inc(&se_cmd->se_dev->num_cmds); + + if (se_cmd->data_direction == DMA_TO_DEVICE) + atomic_long_add(se_cmd->data_length, + &se_cmd->se_dev->write_bytes); + else if (se_cmd->data_direction == DMA_FROM_DEVICE) + atomic_long_add(se_cmd->data_length, + &se_cmd->se_dev->read_bytes); + + return ret; +} +EXPORT_SYMBOL(transport_lookup_cmd_lun); + +int transport_lookup_tmr_lun(struct se_cmd *se_cmd) +{ + struct se_dev_entry *deve; + struct se_lun *se_lun = NULL; + struct se_session *se_sess = se_cmd->se_sess; + struct se_node_acl *nacl = se_sess->se_node_acl; + struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; + unsigned long flags; + + rcu_read_lock(); + deve = target_nacl_find_deve(nacl, se_cmd->orig_fe_lun); + if (deve) { + se_lun = deve->se_lun; + + if (!percpu_ref_tryget_live(&se_lun->lun_ref)) { + se_lun = NULL; + goto out_unlock; + } + + se_cmd->se_lun = se_lun; + se_cmd->pr_res_key = deve->pr_res_key; + se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; + se_cmd->lun_ref_active = true; + } +out_unlock: + rcu_read_unlock(); + + if (!se_lun) { + pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN" + " Access for 0x%08llx for %s\n", + se_cmd->se_tfo->fabric_name, + se_cmd->orig_fe_lun, + nacl->initiatorname); + return -ENODEV; + } + se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev); + se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev); + + spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags); + list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list); + spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags); + + return 0; +} +EXPORT_SYMBOL(transport_lookup_tmr_lun); + +bool target_lun_is_rdonly(struct se_cmd *cmd) +{ + struct se_session *se_sess = cmd->se_sess; + struct se_dev_entry *deve; + bool ret; + + rcu_read_lock(); + deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun); + ret = deve && deve->lun_access_ro; + rcu_read_unlock(); + + return ret; +} +EXPORT_SYMBOL(target_lun_is_rdonly); + +/* + * This function is called from core_scsi3_emulate_pro_register_and_move() + * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref + * when a matching rtpi is found. + */ +struct se_dev_entry *core_get_se_deve_from_rtpi( + struct se_node_acl *nacl, + u16 rtpi) +{ + struct se_dev_entry *deve; + struct se_lun *lun; + struct se_portal_group *tpg = nacl->se_tpg; + + rcu_read_lock(); + hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { + lun = deve->se_lun; + if (!lun) { + pr_err("%s device entries device pointer is" + " NULL, but Initiator has access.\n", + tpg->se_tpg_tfo->fabric_name); + continue; + } + if (lun->lun_rtpi != rtpi) + continue; + + kref_get(&deve->pr_kref); + rcu_read_unlock(); + + return deve; + } + rcu_read_unlock(); + + return NULL; +} + +void core_free_device_list_for_node( + struct se_node_acl *nacl, + struct se_portal_group *tpg) +{ + struct se_dev_entry *deve; + + mutex_lock(&nacl->lun_entry_mutex); + hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) + core_disable_device_list_for_node(deve->se_lun, deve, nacl, tpg); + mutex_unlock(&nacl->lun_entry_mutex); +} + +void core_update_device_list_access( + u64 mapped_lun, + bool lun_access_ro, + struct se_node_acl *nacl) +{ + struct se_dev_entry *deve; + + mutex_lock(&nacl->lun_entry_mutex); + deve = target_nacl_find_deve(nacl, mapped_lun); + if (deve) + deve->lun_access_ro = lun_access_ro; + mutex_unlock(&nacl->lun_entry_mutex); +} + +/* + * Called with rcu_read_lock or nacl->device_list_lock held. + */ +struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun) +{ + struct se_dev_entry *deve; + + hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) + if (deve->mapped_lun == mapped_lun) + return deve; + + return NULL; +} +EXPORT_SYMBOL(target_nacl_find_deve); + +void target_pr_kref_release(struct kref *kref) +{ + struct se_dev_entry *deve = container_of(kref, struct se_dev_entry, + pr_kref); + complete(&deve->pr_comp); +} + +/* + * Establish UA condition on SCSI device - all LUNs + */ +void target_dev_ua_allocate(struct se_device *dev, u8 asc, u8 ascq) +{ + struct se_dev_entry *se_deve; + struct se_lun *lun; + + spin_lock(&dev->se_port_lock); + list_for_each_entry(lun, &dev->dev_sep_list, lun_dev_link) { + + spin_lock(&lun->lun_deve_lock); + list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) + core_scsi3_ua_allocate(se_deve, asc, ascq); + spin_unlock(&lun->lun_deve_lock); + } + spin_unlock(&dev->se_port_lock); +} + +static void +target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new, + bool skip_new) +{ + struct se_dev_entry *tmp; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) { + if (skip_new && tmp == new) + continue; + core_scsi3_ua_allocate(tmp, 0x3F, + ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED); + } + rcu_read_unlock(); +} + +int core_enable_device_list_for_node( + struct se_lun *lun, + struct se_lun_acl *lun_acl, + u64 mapped_lun, + bool lun_access_ro, + struct se_node_acl *nacl, + struct se_portal_group *tpg) +{ + struct se_dev_entry *orig, *new; + + new = kzalloc(sizeof(*new), GFP_KERNEL); + if (!new) { + pr_err("Unable to allocate se_dev_entry memory\n"); + return -ENOMEM; + } + + spin_lock_init(&new->ua_lock); + INIT_LIST_HEAD(&new->ua_list); + INIT_LIST_HEAD(&new->lun_link); + + new->mapped_lun = mapped_lun; + kref_init(&new->pr_kref); + init_completion(&new->pr_comp); + + new->lun_access_ro = lun_access_ro; + new->creation_time = get_jiffies_64(); + new->attach_count++; + + mutex_lock(&nacl->lun_entry_mutex); + orig = target_nacl_find_deve(nacl, mapped_lun); + if (orig && orig->se_lun) { + struct se_lun *orig_lun = orig->se_lun; + + if (orig_lun != lun) { + pr_err("Existing orig->se_lun doesn't match new lun" + " for dynamic -> explicit NodeACL conversion:" + " %s\n", nacl->initiatorname); + mutex_unlock(&nacl->lun_entry_mutex); + kfree(new); + return -EINVAL; + } + if (orig->se_lun_acl != NULL) { + pr_warn_ratelimited("Detected existing explicit" + " se_lun_acl->se_lun_group reference for %s" + " mapped_lun: %llu, failing\n", + nacl->initiatorname, mapped_lun); + mutex_unlock(&nacl->lun_entry_mutex); + kfree(new); + return -EINVAL; + } + + new->se_lun = lun; + new->se_lun_acl = lun_acl; + hlist_del_rcu(&orig->link); + hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist); + mutex_unlock(&nacl->lun_entry_mutex); + + spin_lock(&lun->lun_deve_lock); + list_del(&orig->lun_link); + list_add_tail(&new->lun_link, &lun->lun_deve_list); + spin_unlock(&lun->lun_deve_lock); + + kref_put(&orig->pr_kref, target_pr_kref_release); + wait_for_completion(&orig->pr_comp); + + target_luns_data_has_changed(nacl, new, true); + kfree_rcu(orig, rcu_head); + return 0; + } + + new->se_lun = lun; + new->se_lun_acl = lun_acl; + hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist); + mutex_unlock(&nacl->lun_entry_mutex); + + spin_lock(&lun->lun_deve_lock); + list_add_tail(&new->lun_link, &lun->lun_deve_list); + spin_unlock(&lun->lun_deve_lock); + + target_luns_data_has_changed(nacl, new, true); + return 0; +} + +void core_disable_device_list_for_node( + struct se_lun *lun, + struct se_dev_entry *orig, + struct se_node_acl *nacl, + struct se_portal_group *tpg) +{ + /* + * rcu_dereference_raw protected by se_lun->lun_group symlink + * reference to se_device->dev_group. + */ + struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); + + lockdep_assert_held(&nacl->lun_entry_mutex); + + /* + * If the MappedLUN entry is being disabled, the entry in + * lun->lun_deve_list must be removed now before clearing the + * struct se_dev_entry pointers below as logic in + * core_alua_do_transition_tg_pt() depends on these being present. + * + * deve->se_lun_acl will be NULL for demo-mode created LUNs + * that have not been explicitly converted to MappedLUNs -> + * struct se_lun_acl, but we remove deve->lun_link from + * lun->lun_deve_list. This also means that active UAs and + * NodeACL context specific PR metadata for demo-mode + * MappedLUN *deve will be released below.. + */ + spin_lock(&lun->lun_deve_lock); + list_del(&orig->lun_link); + spin_unlock(&lun->lun_deve_lock); + /* + * Disable struct se_dev_entry LUN ACL mapping + */ + core_scsi3_ua_release_all(orig); + + hlist_del_rcu(&orig->link); + clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags); + orig->lun_access_ro = false; + orig->creation_time = 0; + orig->attach_count--; + /* + * Before firing off RCU callback, wait for any in process SPEC_I_PT=1 + * or REGISTER_AND_MOVE PR operation to complete. + */ + kref_put(&orig->pr_kref, target_pr_kref_release); + wait_for_completion(&orig->pr_comp); + + kfree_rcu(orig, rcu_head); + + core_scsi3_free_pr_reg_from_nacl(dev, nacl); + target_luns_data_has_changed(nacl, NULL, false); +} + +/* core_clear_lun_from_tpg(): + * + * + */ +void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg) +{ + struct se_node_acl *nacl; + struct se_dev_entry *deve; + + mutex_lock(&tpg->acl_node_mutex); + list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) { + + mutex_lock(&nacl->lun_entry_mutex); + hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { + if (lun != deve->se_lun) + continue; + + core_disable_device_list_for_node(lun, deve, nacl, tpg); + } + mutex_unlock(&nacl->lun_entry_mutex); + } + mutex_unlock(&tpg->acl_node_mutex); +} + +int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev) +{ + struct se_lun *tmp; + + spin_lock(&dev->se_port_lock); + if (dev->export_count == 0x0000ffff) { + pr_warn("Reached dev->dev_port_count ==" + " 0x0000ffff\n"); + spin_unlock(&dev->se_port_lock); + return -ENOSPC; + } +again: + /* + * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device + * Here is the table from spc4r17 section 7.7.3.8. + * + * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field + * + * Code Description + * 0h Reserved + * 1h Relative port 1, historically known as port A + * 2h Relative port 2, historically known as port B + * 3h to FFFFh Relative port 3 through 65 535 + */ + lun->lun_rtpi = dev->dev_rpti_counter++; + if (!lun->lun_rtpi) + goto again; + + list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) { + /* + * Make sure RELATIVE TARGET PORT IDENTIFIER is unique + * for 16-bit wrap.. + */ + if (lun->lun_rtpi == tmp->lun_rtpi) + goto again; + } + spin_unlock(&dev->se_port_lock); + + return 0; +} + +static void se_release_vpd_for_dev(struct se_device *dev) +{ + struct t10_vpd *vpd, *vpd_tmp; + + spin_lock(&dev->t10_wwn.t10_vpd_lock); + list_for_each_entry_safe(vpd, vpd_tmp, + &dev->t10_wwn.t10_vpd_list, vpd_list) { + list_del(&vpd->vpd_list); + kfree(vpd); + } + spin_unlock(&dev->t10_wwn.t10_vpd_lock); +} + +static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size) +{ + u32 aligned_max_sectors; + u32 alignment; + /* + * Limit max_sectors to a PAGE_SIZE aligned value for modern + * transport_allocate_data_tasks() operation. + */ + alignment = max(1ul, PAGE_SIZE / block_size); + aligned_max_sectors = rounddown(max_sectors, alignment); + + if (max_sectors != aligned_max_sectors) + pr_info("Rounding down aligned max_sectors from %u to %u\n", + max_sectors, aligned_max_sectors); + + return aligned_max_sectors; +} + +int core_dev_add_lun( + struct se_portal_group *tpg, + struct se_device *dev, + struct se_lun *lun) +{ + int rc; + + rc = core_tpg_add_lun(tpg, lun, false, dev); + if (rc < 0) + return rc; + + pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from" + " CORE HBA: %u\n", tpg->se_tpg_tfo->fabric_name, + tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, + tpg->se_tpg_tfo->fabric_name, dev->se_hba->hba_id); + /* + * Update LUN maps for dynamically added initiators when + * generate_node_acl is enabled. + */ + if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) { + struct se_node_acl *acl; + + mutex_lock(&tpg->acl_node_mutex); + list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { + if (acl->dynamic_node_acl && + (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only || + !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) { + core_tpg_add_node_to_devs(acl, tpg, lun); + } + } + mutex_unlock(&tpg->acl_node_mutex); + } + + return 0; +} + +/* core_dev_del_lun(): + * + * + */ +void core_dev_del_lun( + struct se_portal_group *tpg, + struct se_lun *lun) +{ + pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from" + " device object\n", tpg->se_tpg_tfo->fabric_name, + tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, + tpg->se_tpg_tfo->fabric_name); + + core_tpg_remove_lun(tpg, lun); +} + +struct se_lun_acl *core_dev_init_initiator_node_lun_acl( + struct se_portal_group *tpg, + struct se_node_acl *nacl, + u64 mapped_lun, + int *ret) +{ + struct se_lun_acl *lacl; + + if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) { + pr_err("%s InitiatorName exceeds maximum size.\n", + tpg->se_tpg_tfo->fabric_name); + *ret = -EOVERFLOW; + return NULL; + } + lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL); + if (!lacl) { + pr_err("Unable to allocate memory for struct se_lun_acl.\n"); + *ret = -ENOMEM; + return NULL; + } + + lacl->mapped_lun = mapped_lun; + lacl->se_lun_nacl = nacl; + + return lacl; +} + +int core_dev_add_initiator_node_lun_acl( + struct se_portal_group *tpg, + struct se_lun_acl *lacl, + struct se_lun *lun, + bool lun_access_ro) +{ + struct se_node_acl *nacl = lacl->se_lun_nacl; + /* + * rcu_dereference_raw protected by se_lun->lun_group symlink + * reference to se_device->dev_group. + */ + struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); + + if (!nacl) + return -EINVAL; + + if (lun->lun_access_ro) + lun_access_ro = true; + + lacl->se_lun = lun; + + if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun, + lun_access_ro, nacl, tpg) < 0) + return -EINVAL; + + pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for " + " InitiatorNode: %s\n", tpg->se_tpg_tfo->fabric_name, + tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun, + lun_access_ro ? "RO" : "RW", + nacl->initiatorname); + /* + * Check to see if there are any existing persistent reservation APTPL + * pre-registrations that need to be enabled for this LUN ACL.. + */ + core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl, + lacl->mapped_lun); + return 0; +} + +int core_dev_del_initiator_node_lun_acl( + struct se_lun *lun, + struct se_lun_acl *lacl) +{ + struct se_portal_group *tpg = lun->lun_tpg; + struct se_node_acl *nacl; + struct se_dev_entry *deve; + + nacl = lacl->se_lun_nacl; + if (!nacl) + return -EINVAL; + + mutex_lock(&nacl->lun_entry_mutex); + deve = target_nacl_find_deve(nacl, lacl->mapped_lun); + if (deve) + core_disable_device_list_for_node(lun, deve, nacl, tpg); + mutex_unlock(&nacl->lun_entry_mutex); + + pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for" + " InitiatorNode: %s Mapped LUN: %llu\n", + tpg->se_tpg_tfo->fabric_name, + tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, + nacl->initiatorname, lacl->mapped_lun); + + return 0; +} + +void core_dev_free_initiator_node_lun_acl( + struct se_portal_group *tpg, + struct se_lun_acl *lacl) +{ + pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s" + " Mapped LUN: %llu\n", tpg->se_tpg_tfo->fabric_name, + tpg->se_tpg_tfo->tpg_get_tag(tpg), + tpg->se_tpg_tfo->fabric_name, + lacl->se_lun_nacl->initiatorname, lacl->mapped_lun); + + kfree(lacl); +} + +static void scsi_dump_inquiry(struct se_device *dev) +{ + struct t10_wwn *wwn = &dev->t10_wwn; + int device_type = dev->transport->get_device_type(dev); + + /* + * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer + */ + pr_debug(" Vendor: %-" __stringify(INQUIRY_VENDOR_LEN) "s\n", + wwn->vendor); + pr_debug(" Model: %-" __stringify(INQUIRY_MODEL_LEN) "s\n", + wwn->model); + pr_debug(" Revision: %-" __stringify(INQUIRY_REVISION_LEN) "s\n", + wwn->revision); + pr_debug(" Type: %s ", scsi_device_type(device_type)); +} + +struct se_device *target_alloc_device(struct se_hba *hba, const char *name) +{ + struct se_device *dev; + struct se_lun *xcopy_lun; + int i; + + dev = hba->backend->ops->alloc_device(hba, name); + if (!dev) + return NULL; + + dev->queues = kcalloc(nr_cpu_ids, sizeof(*dev->queues), GFP_KERNEL); + if (!dev->queues) { + dev->transport->free_device(dev); + return NULL; + } + + dev->queue_cnt = nr_cpu_ids; + for (i = 0; i < dev->queue_cnt; i++) { + struct se_device_queue *q; + + q = &dev->queues[i]; + INIT_LIST_HEAD(&q->state_list); + spin_lock_init(&q->lock); + + init_llist_head(&q->sq.cmd_list); + INIT_WORK(&q->sq.work, target_queued_submit_work); + } + + dev->se_hba = hba; + dev->transport = hba->backend->ops; + dev->transport_flags = dev->transport->transport_flags_default; + dev->prot_length = sizeof(struct t10_pi_tuple); + dev->hba_index = hba->hba_index; + + INIT_LIST_HEAD(&dev->dev_sep_list); + INIT_LIST_HEAD(&dev->dev_tmr_list); + INIT_LIST_HEAD(&dev->delayed_cmd_list); + INIT_LIST_HEAD(&dev->qf_cmd_list); + spin_lock_init(&dev->delayed_cmd_lock); + spin_lock_init(&dev->dev_reservation_lock); + spin_lock_init(&dev->se_port_lock); + spin_lock_init(&dev->se_tmr_lock); + spin_lock_init(&dev->qf_cmd_lock); + sema_init(&dev->caw_sem, 1); + INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list); + spin_lock_init(&dev->t10_wwn.t10_vpd_lock); + INIT_LIST_HEAD(&dev->t10_pr.registration_list); + INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list); + spin_lock_init(&dev->t10_pr.registration_lock); + spin_lock_init(&dev->t10_pr.aptpl_reg_lock); + INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list); + spin_lock_init(&dev->t10_alua.tg_pt_gps_lock); + INIT_LIST_HEAD(&dev->t10_alua.lba_map_list); + spin_lock_init(&dev->t10_alua.lba_map_lock); + + INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work); + mutex_init(&dev->lun_reset_mutex); + + dev->t10_wwn.t10_dev = dev; + /* + * Use OpenFabrics IEEE Company ID: 00 14 05 + */ + dev->t10_wwn.company_id = 0x001405; + + dev->t10_alua.t10_dev = dev; + + dev->dev_attrib.da_dev = dev; + dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS; + dev->dev_attrib.emulate_dpo = 1; + dev->dev_attrib.emulate_fua_write = 1; + dev->dev_attrib.emulate_fua_read = 1; + dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE; + dev->dev_attrib.emulate_ua_intlck_ctrl = TARGET_UA_INTLCK_CTRL_CLEAR; + dev->dev_attrib.emulate_tas = DA_EMULATE_TAS; + dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU; + dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS; + dev->dev_attrib.emulate_caw = DA_EMULATE_CAW; + dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC; + dev->dev_attrib.emulate_pr = DA_EMULATE_PR; + dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT; + dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS; + dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL; + dev->dev_attrib.is_nonrot = DA_IS_NONROT; + dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD; + dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT; + dev->dev_attrib.max_unmap_block_desc_count = + DA_MAX_UNMAP_BLOCK_DESC_COUNT; + dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT; + dev->dev_attrib.unmap_granularity_alignment = + DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT; + dev->dev_attrib.unmap_zeroes_data = + DA_UNMAP_ZEROES_DATA_DEFAULT; + dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN; + + xcopy_lun = &dev->xcopy_lun; + rcu_assign_pointer(xcopy_lun->lun_se_dev, dev); + init_completion(&xcopy_lun->lun_shutdown_comp); + INIT_LIST_HEAD(&xcopy_lun->lun_deve_list); + INIT_LIST_HEAD(&xcopy_lun->lun_dev_link); + mutex_init(&xcopy_lun->lun_tg_pt_md_mutex); + xcopy_lun->lun_tpg = &xcopy_pt_tpg; + + /* Preload the default INQUIRY const values */ + strlcpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor)); + strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod, + sizeof(dev->t10_wwn.model)); + strlcpy(dev->t10_wwn.revision, dev->transport->inquiry_rev, + sizeof(dev->t10_wwn.revision)); + + return dev; +} + +/* + * Check if the underlying struct block_device supports discard and if yes + * configure the UNMAP parameters. + */ +bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib, + struct block_device *bdev) +{ + int block_size = bdev_logical_block_size(bdev); + + if (!bdev_max_discard_sectors(bdev)) + return false; + + attrib->max_unmap_lba_count = + bdev_max_discard_sectors(bdev) >> (ilog2(block_size) - 9); + /* + * Currently hardcoded to 1 in Linux/SCSI code.. + */ + attrib->max_unmap_block_desc_count = 1; + attrib->unmap_granularity = bdev_discard_granularity(bdev) / block_size; + attrib->unmap_granularity_alignment = + bdev_discard_alignment(bdev) / block_size; + return true; +} +EXPORT_SYMBOL(target_configure_unmap_from_queue); + +/* + * Convert from blocksize advertised to the initiator to the 512 byte + * units unconditionally used by the Linux block layer. + */ +sector_t target_to_linux_sector(struct se_device *dev, sector_t lb) +{ + switch (dev->dev_attrib.block_size) { + case 4096: + return lb << 3; + case 2048: + return lb << 2; + case 1024: + return lb << 1; + default: + return lb; + } +} +EXPORT_SYMBOL(target_to_linux_sector); + +struct devices_idr_iter { + int (*fn)(struct se_device *dev, void *data); + void *data; +}; + +static int target_devices_idr_iter(int id, void *p, void *data) + __must_hold(&device_mutex) +{ + struct devices_idr_iter *iter = data; + struct se_device *dev = p; + struct config_item *item; + int ret; + + /* + * We add the device early to the idr, so it can be used + * by backend modules during configuration. We do not want + * to allow other callers to access partially setup devices, + * so we skip them here. + */ + if (!target_dev_configured(dev)) + return 0; + + item = config_item_get_unless_zero(&dev->dev_group.cg_item); + if (!item) + return 0; + mutex_unlock(&device_mutex); + + ret = iter->fn(dev, iter->data); + config_item_put(item); + + mutex_lock(&device_mutex); + return ret; +} + +/** + * target_for_each_device - iterate over configured devices + * @fn: iterator function + * @data: pointer to data that will be passed to fn + * + * fn must return 0 to continue looping over devices. non-zero will break + * from the loop and return that value to the caller. + */ +int target_for_each_device(int (*fn)(struct se_device *dev, void *data), + void *data) +{ + struct devices_idr_iter iter = { .fn = fn, .data = data }; + int ret; + + mutex_lock(&device_mutex); + ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter); + mutex_unlock(&device_mutex); + return ret; +} + +int target_configure_device(struct se_device *dev) +{ + struct se_hba *hba = dev->se_hba; + int ret, id; + + if (target_dev_configured(dev)) { + pr_err("se_dev->se_dev_ptr already set for storage" + " object\n"); + return -EEXIST; + } + + /* + * Add early so modules like tcmu can use during its + * configuration. + */ + mutex_lock(&device_mutex); + /* + * Use cyclic to try and avoid collisions with devices + * that were recently removed. + */ + id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL); + mutex_unlock(&device_mutex); + if (id < 0) { + ret = -ENOMEM; + goto out; + } + dev->dev_index = id; + + ret = dev->transport->configure_device(dev); + if (ret) + goto out_free_index; + + if (dev->transport->configure_unmap && + dev->transport->configure_unmap(dev)) { + pr_debug("Discard support available, but disabled by default.\n"); + } + + /* + * XXX: there is not much point to have two different values here.. + */ + dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size; + dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth; + + /* + * Align max_hw_sectors down to PAGE_SIZE I/O transfers + */ + dev->dev_attrib.hw_max_sectors = + se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors, + dev->dev_attrib.hw_block_size); + dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors; + + dev->creation_time = get_jiffies_64(); + + ret = core_setup_alua(dev); + if (ret) + goto out_destroy_device; + + /* + * Setup work_queue for QUEUE_FULL + */ + INIT_WORK(&dev->qf_work_queue, target_qf_do_work); + + scsi_dump_inquiry(dev); + + spin_lock(&hba->device_lock); + hba->dev_count++; + spin_unlock(&hba->device_lock); + + dev->dev_flags |= DF_CONFIGURED; + + return 0; + +out_destroy_device: + dev->transport->destroy_device(dev); +out_free_index: + mutex_lock(&device_mutex); + idr_remove(&devices_idr, dev->dev_index); + mutex_unlock(&device_mutex); +out: + se_release_vpd_for_dev(dev); + return ret; +} + +void target_free_device(struct se_device *dev) +{ + struct se_hba *hba = dev->se_hba; + + WARN_ON(!list_empty(&dev->dev_sep_list)); + + if (target_dev_configured(dev)) { + dev->transport->destroy_device(dev); + + mutex_lock(&device_mutex); + idr_remove(&devices_idr, dev->dev_index); + mutex_unlock(&device_mutex); + + spin_lock(&hba->device_lock); + hba->dev_count--; + spin_unlock(&hba->device_lock); + } + + core_alua_free_lu_gp_mem(dev); + core_alua_set_lba_map(dev, NULL, 0, 0); + core_scsi3_free_all_registrations(dev); + se_release_vpd_for_dev(dev); + + if (dev->transport->free_prot) + dev->transport->free_prot(dev); + + kfree(dev->queues); + dev->transport->free_device(dev); +} + +int core_dev_setup_virtual_lun0(void) +{ + struct se_hba *hba; + struct se_device *dev; + char buf[] = "rd_pages=8,rd_nullio=1,rd_dummy=1"; + int ret; + + hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE); + if (IS_ERR(hba)) + return PTR_ERR(hba); + + dev = target_alloc_device(hba, "virt_lun0"); + if (!dev) { + ret = -ENOMEM; + goto out_free_hba; + } + + hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf)); + + ret = target_configure_device(dev); + if (ret) + goto out_free_se_dev; + + lun0_hba = hba; + g_lun0_dev = dev; + return 0; + +out_free_se_dev: + target_free_device(dev); +out_free_hba: + core_delete_hba(hba); + return ret; +} + + +void core_dev_release_virtual_lun0(void) +{ + struct se_hba *hba = lun0_hba; + + if (!hba) + return; + + if (g_lun0_dev) + target_free_device(g_lun0_dev); + core_delete_hba(hba); +} + +/* + * Common CDB parsing for kernel and user passthrough. + */ +sense_reason_t +passthrough_parse_cdb(struct se_cmd *cmd, + sense_reason_t (*exec_cmd)(struct se_cmd *cmd)) +{ + unsigned char *cdb = cmd->t_task_cdb; + struct se_device *dev = cmd->se_dev; + unsigned int size; + + /* + * For REPORT LUNS we always need to emulate the response, for everything + * else, pass it up. + */ + if (cdb[0] == REPORT_LUNS) { + cmd->execute_cmd = spc_emulate_report_luns; + return TCM_NO_SENSE; + } + + /* + * With emulate_pr disabled, all reservation requests should fail, + * regardless of whether or not TRANSPORT_FLAG_PASSTHROUGH_PGR is set. + */ + if (!dev->dev_attrib.emulate_pr && + ((cdb[0] == PERSISTENT_RESERVE_IN) || + (cdb[0] == PERSISTENT_RESERVE_OUT) || + (cdb[0] == RELEASE || cdb[0] == RELEASE_10) || + (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) { + return TCM_UNSUPPORTED_SCSI_OPCODE; + } + + /* + * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to + * emulate the response, since tcmu does not have the information + * required to process these commands. + */ + if (!(dev->transport_flags & + TRANSPORT_FLAG_PASSTHROUGH_PGR)) { + if (cdb[0] == PERSISTENT_RESERVE_IN) { + cmd->execute_cmd = target_scsi3_emulate_pr_in; + size = get_unaligned_be16(&cdb[7]); + return target_cmd_size_check(cmd, size); + } + if (cdb[0] == PERSISTENT_RESERVE_OUT) { + cmd->execute_cmd = target_scsi3_emulate_pr_out; + size = get_unaligned_be32(&cdb[5]); + return target_cmd_size_check(cmd, size); + } + + if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) { + cmd->execute_cmd = target_scsi2_reservation_release; + if (cdb[0] == RELEASE_10) + size = get_unaligned_be16(&cdb[7]); + else + size = cmd->data_length; + return target_cmd_size_check(cmd, size); + } + if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) { + cmd->execute_cmd = target_scsi2_reservation_reserve; + if (cdb[0] == RESERVE_10) + size = get_unaligned_be16(&cdb[7]); + else + size = cmd->data_length; + return target_cmd_size_check(cmd, size); + } + } + + /* Set DATA_CDB flag for ops that should have it */ + switch (cdb[0]) { + case READ_6: + case READ_10: + case READ_12: + case READ_16: + case WRITE_6: + case WRITE_10: + case WRITE_12: + case WRITE_16: + case WRITE_VERIFY: + case WRITE_VERIFY_12: + case WRITE_VERIFY_16: + case COMPARE_AND_WRITE: + case XDWRITEREAD_10: + cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; + break; + case VARIABLE_LENGTH_CMD: + switch (get_unaligned_be16(&cdb[8])) { + case READ_32: + case WRITE_32: + case WRITE_VERIFY_32: + case XDWRITEREAD_32: + cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; + break; + } + } + + cmd->execute_cmd = exec_cmd; + + return TCM_NO_SENSE; +} +EXPORT_SYMBOL(passthrough_parse_cdb); |