linux/drivers/target/target_core_tpg.c
Linus Torvalds c9bfa7d75b Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
Pull scsi-target changes from Nicholas Bellinger:
 "There has been lots of work in existing code in a number of areas this
  past cycle.  The major highlights have been:

   * Removal of transport_do_task_sg_chain() from core + fabrics
     (Roland)
   * target-core: Removal of se_task abstraction from target-core and
     enforce hw_max_sectors for pSCSI backends (hch)
   * Re-factoring of iscsi-target tx immediate/response queues (agrover)
   * Conversion of iscsi-target back to using target core memory
     allocation logic (agrover)

  We've had one last minute iscsi-target patch go into for-next to
  address a nasty regression bug related to the target core allocation
  logic conversion from agrover that is not included in friday's
  linux-next build, but has been included in this series.

  On the new fabric module code front for-3.5, here is a brief status
  update for the three currently in flight this round:

   * usb-gadget target driver:

  Sebastian Siewior's driver for supporting usb-gadget target mode
  operation.  This will be going out as a separate PULL request from
  target-pending/usb-target-merge with subsystem maintainer ACKs.  There
  is one minor target-core patch in this series required to function.

   * sbp ieee-1394/firewire target driver:

  Chris Boot's driver for supportting the Serial Block Protocol (SBP)
  across IEEE-1394 Firewire hardware.  This will be going out as a
  separate PULL request from target-pending/sbp-target-merge with two
  additional drivers/firewire/ patches w/ subsystem maintainer ACKs.

   * qla2xxx LLD target mode infrastructure changes + tcm_qla2xxx:

  The Qlogic >= 24xx series HW target mode LLD infrastructure patch-set
  and tcm_qla2xxx fabric driver.  Support for FC target mode using
  qla2xxx LLD code has been officially submitted by Qlogic to James
  below, and is currently outstanding but not yet merged into
  scsi.git/for-next..

    [PATCH 00/22] qla2xxx: Updates for scsi "misc" branch
    http://www.spinics.net/lists/linux-scsi/msg59350.html

  Note there are *zero* direct dependencies upon this for-next series
  for the qla2xxx LLD target + tcm_qla2xxx patches submitted above, and
  over the last days the target mode team has been tracking down an
  tcm_qla2xxx specific active I/O shutdown bug that appears to now be
  almost squashed for 3.5-rc-fixes."

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (47 commits)
  iscsi-target: Fix iov_count calculation bug in iscsit_allocate_iovecs
  iscsi-target: remove dead code in iscsi_check_valuelist_for_support
  target: Handle ATA_16 passthrough for pSCSI backend devices
  target: Add MI_REPORT_TARGET_PGS ext. header + implict_trans_secs attribute
  target: Fix MAINTENANCE_IN service action CDB checks to use lower 5 bits
  target: add support for the WRITE_VERIFY command
  target: make target_put_session void
  target: cleanup transport_execute_tasks()
  target: Remove max_sectors device attribute for modern se_task less code
  target: lock => unlock typo in transport_lun_wait_for_tasks
  target: Enforce hw_max_sectors for SCF_SCSI_DATA_SG_IO_CDB
  target: remove the t_se_count field in struct se_cmd
  target: remove the t_task_cdbs_ex_left field in struct se_cmd
  target: remove the t_task_cdbs_left field in struct se_cmd
  target: remove struct se_task
  target: move the state and execute lists to the command
  target: simplify command to task linkage
  target: always allocate a single task
  target: replace ->execute_task with ->execute_cmd
  target: remove the task_sectors field in struct se_task
  ...
2012-05-21 17:37:09 -07:00

868 lines
23 KiB
C

/*******************************************************************************
* Filename: target_core_tpg.c
*
* This file contains generic Target Portal Group related functions.
*
* Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
* Copyright (c) 2005, 2006, 2007 SBE, Inc.
* Copyright (c) 2007-2010 Rising Tide Systems
* Copyright (c) 2008-2010 Linux-iSCSI.org
*
* Nicholas A. Bellinger <nab@kernel.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
******************************************************************************/
#include <linux/net.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/in.h>
#include <linux/export.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>
#include "target_core_internal.h"
extern struct se_device *g_lun0_dev;
static DEFINE_SPINLOCK(tpg_lock);
static LIST_HEAD(tpg_list);
/* core_clear_initiator_node_from_tpg():
*
*
*/
static void core_clear_initiator_node_from_tpg(
struct se_node_acl *nacl,
struct se_portal_group *tpg)
{
int i;
struct se_dev_entry *deve;
struct se_lun *lun;
spin_lock_irq(&nacl->device_list_lock);
for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
deve = nacl->device_list[i];
if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
continue;
if (!deve->se_lun) {
pr_err("%s device entries device pointer is"
" NULL, but Initiator has access.\n",
tpg->se_tpg_tfo->get_fabric_name());
continue;
}
lun = deve->se_lun;
spin_unlock_irq(&nacl->device_list_lock);
core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
spin_lock_irq(&nacl->device_list_lock);
}
spin_unlock_irq(&nacl->device_list_lock);
}
/* __core_tpg_get_initiator_node_acl():
*
* spin_lock_bh(&tpg->acl_node_lock); must be held when calling
*/
struct se_node_acl *__core_tpg_get_initiator_node_acl(
struct se_portal_group *tpg,
const char *initiatorname)
{
struct se_node_acl *acl;
list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
if (!strcmp(acl->initiatorname, initiatorname))
return acl;
}
return NULL;
}
/* core_tpg_get_initiator_node_acl():
*
*
*/
struct se_node_acl *core_tpg_get_initiator_node_acl(
struct se_portal_group *tpg,
unsigned char *initiatorname)
{
struct se_node_acl *acl;
spin_lock_irq(&tpg->acl_node_lock);
list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
if (!strcmp(acl->initiatorname, initiatorname) &&
!acl->dynamic_node_acl) {
spin_unlock_irq(&tpg->acl_node_lock);
return acl;
}
}
spin_unlock_irq(&tpg->acl_node_lock);
return NULL;
}
/* core_tpg_add_node_to_devs():
*
*
*/
void core_tpg_add_node_to_devs(
struct se_node_acl *acl,
struct se_portal_group *tpg)
{
int i = 0;
u32 lun_access = 0;
struct se_lun *lun;
struct se_device *dev;
spin_lock(&tpg->tpg_lun_lock);
for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
lun = tpg->tpg_lun_list[i];
if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
continue;
spin_unlock(&tpg->tpg_lun_lock);
dev = lun->lun_se_dev;
/*
* By default in LIO-Target $FABRIC_MOD,
* demo_mode_write_protect is ON, or READ_ONLY;
*/
if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
} else {
/*
* Allow only optical drives to issue R/W in default RO
* demo mode.
*/
if (dev->transport->get_device_type(dev) == TYPE_DISK)
lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
else
lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
}
pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
" access for LUN in Demo Mode\n",
tpg->se_tpg_tfo->get_fabric_name(),
tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
(lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
"READ-WRITE" : "READ-ONLY");
core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
lun_access, acl, tpg, 1);
spin_lock(&tpg->tpg_lun_lock);
}
spin_unlock(&tpg->tpg_lun_lock);
}
/* core_set_queue_depth_for_node():
*
*
*/
static int core_set_queue_depth_for_node(
struct se_portal_group *tpg,
struct se_node_acl *acl)
{
if (!acl->queue_depth) {
pr_err("Queue depth for %s Initiator Node: %s is 0,"
"defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
acl->initiatorname);
acl->queue_depth = 1;
}
return 0;
}
void array_free(void *array, int n)
{
void **a = array;
int i;
for (i = 0; i < n; i++)
kfree(a[i]);
kfree(a);
}
static void *array_zalloc(int n, size_t size, gfp_t flags)
{
void **a;
int i;
a = kzalloc(n * sizeof(void*), flags);
if (!a)
return NULL;
for (i = 0; i < n; i++) {
a[i] = kzalloc(size, flags);
if (!a[i]) {
array_free(a, n);
return NULL;
}
}
return a;
}
/* core_create_device_list_for_node():
*
*
*/
static int core_create_device_list_for_node(struct se_node_acl *nacl)
{
struct se_dev_entry *deve;
int i;
nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
sizeof(struct se_dev_entry), GFP_KERNEL);
if (!nacl->device_list) {
pr_err("Unable to allocate memory for"
" struct se_node_acl->device_list\n");
return -ENOMEM;
}
for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
deve = nacl->device_list[i];
atomic_set(&deve->ua_count, 0);
atomic_set(&deve->pr_ref_count, 0);
spin_lock_init(&deve->ua_lock);
INIT_LIST_HEAD(&deve->alua_port_list);
INIT_LIST_HEAD(&deve->ua_list);
}
return 0;
}
/* core_tpg_check_initiator_node_acl()
*
*
*/
struct se_node_acl *core_tpg_check_initiator_node_acl(
struct se_portal_group *tpg,
unsigned char *initiatorname)
{
struct se_node_acl *acl;
acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
if (acl)
return acl;
if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
return NULL;
acl = tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
if (!acl)
return NULL;
INIT_LIST_HEAD(&acl->acl_list);
INIT_LIST_HEAD(&acl->acl_sess_list);
kref_init(&acl->acl_kref);
init_completion(&acl->acl_free_comp);
spin_lock_init(&acl->device_list_lock);
spin_lock_init(&acl->nacl_sess_lock);
atomic_set(&acl->acl_pr_ref_count, 0);
acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
acl->se_tpg = tpg;
acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
spin_lock_init(&acl->stats_lock);
acl->dynamic_node_acl = 1;
tpg->se_tpg_tfo->set_default_node_attributes(acl);
if (core_create_device_list_for_node(acl) < 0) {
tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
return NULL;
}
if (core_set_queue_depth_for_node(tpg, acl) < 0) {
core_free_device_list_for_node(acl, tpg);
tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
return NULL;
}
/*
* Here we only create demo-mode MappedLUNs from the active
* TPG LUNs if the fabric is not explictly asking for
* tpg_check_demo_mode_login_only() == 1.
*/
if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only != NULL) &&
(tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) == 1))
do { ; } while (0);
else
core_tpg_add_node_to_devs(acl, tpg);
spin_lock_irq(&tpg->acl_node_lock);
list_add_tail(&acl->acl_list, &tpg->acl_node_list);
tpg->num_node_acls++;
spin_unlock_irq(&tpg->acl_node_lock);
pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
" Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
return acl;
}
EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
{
while (atomic_read(&nacl->acl_pr_ref_count) != 0)
cpu_relax();
}
void core_tpg_clear_object_luns(struct se_portal_group *tpg)
{
int i;
struct se_lun *lun;
spin_lock(&tpg->tpg_lun_lock);
for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
lun = tpg->tpg_lun_list[i];
if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
(lun->lun_se_dev == NULL))
continue;
spin_unlock(&tpg->tpg_lun_lock);
core_dev_del_lun(tpg, lun->unpacked_lun);
spin_lock(&tpg->tpg_lun_lock);
}
spin_unlock(&tpg->tpg_lun_lock);
}
EXPORT_SYMBOL(core_tpg_clear_object_luns);
/* core_tpg_add_initiator_node_acl():
*
*
*/
struct se_node_acl *core_tpg_add_initiator_node_acl(
struct se_portal_group *tpg,
struct se_node_acl *se_nacl,
const char *initiatorname,
u32 queue_depth)
{
struct se_node_acl *acl = NULL;
spin_lock_irq(&tpg->acl_node_lock);
acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
if (acl) {
if (acl->dynamic_node_acl) {
acl->dynamic_node_acl = 0;
pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
" for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
spin_unlock_irq(&tpg->acl_node_lock);
/*
* Release the locally allocated struct se_node_acl
* because * core_tpg_add_initiator_node_acl() returned
* a pointer to an existing demo mode node ACL.
*/
if (se_nacl)
tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
se_nacl);
goto done;
}
pr_err("ACL entry for %s Initiator"
" Node %s already exists for TPG %u, ignoring"
" request.\n", tpg->se_tpg_tfo->get_fabric_name(),
initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
spin_unlock_irq(&tpg->acl_node_lock);
return ERR_PTR(-EEXIST);
}
spin_unlock_irq(&tpg->acl_node_lock);
if (!se_nacl) {
pr_err("struct se_node_acl pointer is NULL\n");
return ERR_PTR(-EINVAL);
}
/*
* For v4.x logic the se_node_acl_s is hanging off a fabric
* dependent structure allocated via
* struct target_core_fabric_ops->fabric_make_nodeacl()
*/
acl = se_nacl;
INIT_LIST_HEAD(&acl->acl_list);
INIT_LIST_HEAD(&acl->acl_sess_list);
kref_init(&acl->acl_kref);
init_completion(&acl->acl_free_comp);
spin_lock_init(&acl->device_list_lock);
spin_lock_init(&acl->nacl_sess_lock);
atomic_set(&acl->acl_pr_ref_count, 0);
acl->queue_depth = queue_depth;
snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
acl->se_tpg = tpg;
acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
spin_lock_init(&acl->stats_lock);
tpg->se_tpg_tfo->set_default_node_attributes(acl);
if (core_create_device_list_for_node(acl) < 0) {
tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
return ERR_PTR(-ENOMEM);
}
if (core_set_queue_depth_for_node(tpg, acl) < 0) {
core_free_device_list_for_node(acl, tpg);
tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
return ERR_PTR(-EINVAL);
}
spin_lock_irq(&tpg->acl_node_lock);
list_add_tail(&acl->acl_list, &tpg->acl_node_list);
tpg->num_node_acls++;
spin_unlock_irq(&tpg->acl_node_lock);
done:
pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
" Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
return acl;
}
EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
/* core_tpg_del_initiator_node_acl():
*
*
*/
int core_tpg_del_initiator_node_acl(
struct se_portal_group *tpg,
struct se_node_acl *acl,
int force)
{
LIST_HEAD(sess_list);
struct se_session *sess, *sess_tmp;
unsigned long flags;
int rc;
spin_lock_irq(&tpg->acl_node_lock);
if (acl->dynamic_node_acl) {
acl->dynamic_node_acl = 0;
}
list_del(&acl->acl_list);
tpg->num_node_acls--;
spin_unlock_irq(&tpg->acl_node_lock);
spin_lock_irqsave(&acl->nacl_sess_lock, flags);
acl->acl_stop = 1;
list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
sess_acl_list) {
if (sess->sess_tearing_down != 0)
continue;
target_get_session(sess);
list_move(&sess->sess_acl_list, &sess_list);
}
spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
list_del(&sess->sess_acl_list);
rc = tpg->se_tpg_tfo->shutdown_session(sess);
target_put_session(sess);
if (!rc)
continue;
target_put_session(sess);
}
target_put_nacl(acl);
/*
* Wait for last target_put_nacl() to complete in target_complete_nacl()
* for active fabric session transport_deregister_session() callbacks.
*/
wait_for_completion(&acl->acl_free_comp);
core_tpg_wait_for_nacl_pr_ref(acl);
core_clear_initiator_node_from_tpg(acl, tpg);
core_free_device_list_for_node(acl, tpg);
pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
" Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
return 0;
}
EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
/* core_tpg_set_initiator_node_queue_depth():
*
*
*/
int core_tpg_set_initiator_node_queue_depth(
struct se_portal_group *tpg,
unsigned char *initiatorname,
u32 queue_depth,
int force)
{
struct se_session *sess, *init_sess = NULL;
struct se_node_acl *acl;
unsigned long flags;
int dynamic_acl = 0;
spin_lock_irq(&tpg->acl_node_lock);
acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
if (!acl) {
pr_err("Access Control List entry for %s Initiator"
" Node %s does not exists for TPG %hu, ignoring"
" request.\n", tpg->se_tpg_tfo->get_fabric_name(),
initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
spin_unlock_irq(&tpg->acl_node_lock);
return -ENODEV;
}
if (acl->dynamic_node_acl) {
acl->dynamic_node_acl = 0;
dynamic_acl = 1;
}
spin_unlock_irq(&tpg->acl_node_lock);
spin_lock_irqsave(&tpg->session_lock, flags);
list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
if (sess->se_node_acl != acl)
continue;
if (!force) {
pr_err("Unable to change queue depth for %s"
" Initiator Node: %s while session is"
" operational. To forcefully change the queue"
" depth and force session reinstatement"
" use the \"force=1\" parameter.\n",
tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
spin_unlock_irqrestore(&tpg->session_lock, flags);
spin_lock_irq(&tpg->acl_node_lock);
if (dynamic_acl)
acl->dynamic_node_acl = 1;
spin_unlock_irq(&tpg->acl_node_lock);
return -EEXIST;
}
/*
* Determine if the session needs to be closed by our context.
*/
if (!tpg->se_tpg_tfo->shutdown_session(sess))
continue;
init_sess = sess;
break;
}
/*
* User has requested to change the queue depth for a Initiator Node.
* Change the value in the Node's struct se_node_acl, and call
* core_set_queue_depth_for_node() to add the requested queue depth.
*
* Finally call tpg->se_tpg_tfo->close_session() to force session
* reinstatement to occur if there is an active session for the
* $FABRIC_MOD Initiator Node in question.
*/
acl->queue_depth = queue_depth;
if (core_set_queue_depth_for_node(tpg, acl) < 0) {
spin_unlock_irqrestore(&tpg->session_lock, flags);
/*
* Force session reinstatement if
* core_set_queue_depth_for_node() failed, because we assume
* the $FABRIC_MOD has already the set session reinstatement
* bit from tpg->se_tpg_tfo->shutdown_session() called above.
*/
if (init_sess)
tpg->se_tpg_tfo->close_session(init_sess);
spin_lock_irq(&tpg->acl_node_lock);
if (dynamic_acl)
acl->dynamic_node_acl = 1;
spin_unlock_irq(&tpg->acl_node_lock);
return -EINVAL;
}
spin_unlock_irqrestore(&tpg->session_lock, flags);
/*
* If the $FABRIC_MOD session for the Initiator Node ACL exists,
* forcefully shutdown the $FABRIC_MOD session/nexus.
*/
if (init_sess)
tpg->se_tpg_tfo->close_session(init_sess);
pr_debug("Successfully changed queue depth to: %d for Initiator"
" Node: %s on %s Target Portal Group: %u\n", queue_depth,
initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
tpg->se_tpg_tfo->tpg_get_tag(tpg));
spin_lock_irq(&tpg->acl_node_lock);
if (dynamic_acl)
acl->dynamic_node_acl = 1;
spin_unlock_irq(&tpg->acl_node_lock);
return 0;
}
EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
{
/* Set in core_dev_setup_virtual_lun0() */
struct se_device *dev = g_lun0_dev;
struct se_lun *lun = &se_tpg->tpg_virt_lun0;
u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
int ret;
lun->unpacked_lun = 0;
lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
atomic_set(&lun->lun_acl_count, 0);
init_completion(&lun->lun_shutdown_comp);
INIT_LIST_HEAD(&lun->lun_acl_list);
INIT_LIST_HEAD(&lun->lun_cmd_list);
spin_lock_init(&lun->lun_acl_lock);
spin_lock_init(&lun->lun_cmd_lock);
spin_lock_init(&lun->lun_sep_lock);
ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
if (ret < 0)
return ret;
return 0;
}
static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
{
struct se_lun *lun = &se_tpg->tpg_virt_lun0;
core_tpg_post_dellun(se_tpg, lun);
}
int core_tpg_register(
struct target_core_fabric_ops *tfo,
struct se_wwn *se_wwn,
struct se_portal_group *se_tpg,
void *tpg_fabric_ptr,
int se_tpg_type)
{
struct se_lun *lun;
u32 i;
se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
sizeof(struct se_lun), GFP_KERNEL);
if (!se_tpg->tpg_lun_list) {
pr_err("Unable to allocate struct se_portal_group->"
"tpg_lun_list\n");
return -ENOMEM;
}
for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
lun = se_tpg->tpg_lun_list[i];
lun->unpacked_lun = i;
lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
atomic_set(&lun->lun_acl_count, 0);
init_completion(&lun->lun_shutdown_comp);
INIT_LIST_HEAD(&lun->lun_acl_list);
INIT_LIST_HEAD(&lun->lun_cmd_list);
spin_lock_init(&lun->lun_acl_lock);
spin_lock_init(&lun->lun_cmd_lock);
spin_lock_init(&lun->lun_sep_lock);
}
se_tpg->se_tpg_type = se_tpg_type;
se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
se_tpg->se_tpg_tfo = tfo;
se_tpg->se_tpg_wwn = se_wwn;
atomic_set(&se_tpg->tpg_pr_ref_count, 0);
INIT_LIST_HEAD(&se_tpg->acl_node_list);
INIT_LIST_HEAD(&se_tpg->se_tpg_node);
INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
spin_lock_init(&se_tpg->acl_node_lock);
spin_lock_init(&se_tpg->session_lock);
spin_lock_init(&se_tpg->tpg_lun_lock);
if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
kfree(se_tpg);
return -ENOMEM;
}
}
spin_lock_bh(&tpg_lock);
list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
spin_unlock_bh(&tpg_lock);
pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
" endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
(se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
"Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
"None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
return 0;
}
EXPORT_SYMBOL(core_tpg_register);
int core_tpg_deregister(struct se_portal_group *se_tpg)
{
struct se_node_acl *nacl, *nacl_tmp;
pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
" for endpoint: %s Portal Tag %u\n",
(se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
"Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
spin_lock_bh(&tpg_lock);
list_del(&se_tpg->se_tpg_node);
spin_unlock_bh(&tpg_lock);
while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
cpu_relax();
/*
* Release any remaining demo-mode generated se_node_acl that have
* not been released because of TFO->tpg_check_demo_mode_cache() == 1
* in transport_deregister_session().
*/
spin_lock_irq(&se_tpg->acl_node_lock);
list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
acl_list) {
list_del(&nacl->acl_list);
se_tpg->num_node_acls--;
spin_unlock_irq(&se_tpg->acl_node_lock);
core_tpg_wait_for_nacl_pr_ref(nacl);
core_free_device_list_for_node(nacl, se_tpg);
se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
spin_lock_irq(&se_tpg->acl_node_lock);
}
spin_unlock_irq(&se_tpg->acl_node_lock);
if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
core_tpg_release_virtual_lun0(se_tpg);
se_tpg->se_tpg_fabric_ptr = NULL;
array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
return 0;
}
EXPORT_SYMBOL(core_tpg_deregister);
struct se_lun *core_tpg_pre_addlun(
struct se_portal_group *tpg,
u32 unpacked_lun)
{
struct se_lun *lun;
if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
"-1: %u for Target Portal Group: %u\n",
tpg->se_tpg_tfo->get_fabric_name(),
unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
tpg->se_tpg_tfo->tpg_get_tag(tpg));
return ERR_PTR(-EOVERFLOW);
}
spin_lock(&tpg->tpg_lun_lock);
lun = tpg->tpg_lun_list[unpacked_lun];
if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
pr_err("TPG Logical Unit Number: %u is already active"
" on %s Target Portal Group: %u, ignoring request.\n",
unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
tpg->se_tpg_tfo->tpg_get_tag(tpg));
spin_unlock(&tpg->tpg_lun_lock);
return ERR_PTR(-EINVAL);
}
spin_unlock(&tpg->tpg_lun_lock);
return lun;
}
int core_tpg_post_addlun(
struct se_portal_group *tpg,
struct se_lun *lun,
u32 lun_access,
void *lun_ptr)
{
int ret;
ret = core_dev_export(lun_ptr, tpg, lun);
if (ret < 0)
return ret;
spin_lock(&tpg->tpg_lun_lock);
lun->lun_access = lun_access;
lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
spin_unlock(&tpg->tpg_lun_lock);
return 0;
}
static void core_tpg_shutdown_lun(
struct se_portal_group *tpg,
struct se_lun *lun)
{
core_clear_lun_from_tpg(lun, tpg);
transport_clear_lun_from_sessions(lun);
}
struct se_lun *core_tpg_pre_dellun(
struct se_portal_group *tpg,
u32 unpacked_lun)
{
struct se_lun *lun;
if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
"-1: %u for Target Portal Group: %u\n",
tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
TRANSPORT_MAX_LUNS_PER_TPG-1,
tpg->se_tpg_tfo->tpg_get_tag(tpg));
return ERR_PTR(-EOVERFLOW);
}
spin_lock(&tpg->tpg_lun_lock);
lun = tpg->tpg_lun_list[unpacked_lun];
if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
pr_err("%s Logical Unit Number: %u is not active on"
" Target Portal Group: %u, ignoring request.\n",
tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
tpg->se_tpg_tfo->tpg_get_tag(tpg));
spin_unlock(&tpg->tpg_lun_lock);
return ERR_PTR(-ENODEV);
}
spin_unlock(&tpg->tpg_lun_lock);
return lun;
}
int core_tpg_post_dellun(
struct se_portal_group *tpg,
struct se_lun *lun)
{
core_tpg_shutdown_lun(tpg, lun);
core_dev_unexport(lun->lun_se_dev, tpg, lun);
spin_lock(&tpg->tpg_lun_lock);
lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
spin_unlock(&tpg->tpg_lun_lock);
return 0;
}