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linux-sg2042/drivers/target/target_core_device.c

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// 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, 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);
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->orig_fe_lun = unpacked_lun;
se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
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->fabric_name,
unpacked_lun);
rcu_read_unlock();
ret = TCM_WRITE_PROTECTED;
goto ref_dev;
}
}
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 (unpacked_lun != 0) {
pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
" Access for 0x%08llx\n",
se_cmd->se_tfo->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_lun = rcu_dereference(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->orig_fe_lun = unpacked_lun;
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\n",
se_cmd->se_tfo->fabric_name,
unpacked_lun);
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 = 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->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;
}
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;
}
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);
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->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;
dev = hba->backend->ops->alloc_device(hba, name);
if (!dev)
return NULL;
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_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);
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.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 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.max_write_zeroes_sectors);
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 {
struct config_item *prev_item;
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;
int ret;
config_item_put(iter->prev_item);
iter->prev_item = NULL;
/*
* 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;
iter->prev_item = config_item_get_unless_zero(&dev->dev_group.cg_item);
if (!iter->prev_item)
return 0;
mutex_unlock(&device_mutex);
ret = iter->fn(dev, iter->data);
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);
config_item_put(iter.prev_item);
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;
/*
* 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);
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;
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->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);
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