[SCSI] target: Add LIO target core v4.0.0-rc6
LIO target is a full featured in-kernel target framework with the
following feature set:
High-performance, non-blocking, multithreaded architecture with SIMD
support.
Advanced SCSI feature set:
* Persistent Reservations (PRs)
* Asymmetric Logical Unit Assignment (ALUA)
* Protocol and intra-nexus multiplexing, load-balancing and failover (MC/S)
* Full Error Recovery (ERL=0,1,2)
* Active/active task migration and session continuation (ERL=2)
* Thin LUN provisioning (UNMAP and WRITE_SAMExx)
Multiprotocol target plugins
Storage media independence:
* Virtualization of all storage media; transparent mapping of IO to LUNs
* No hard limits on number of LUNs per Target; maximum LUN size ~750 TB
* Backstores: SATA, SAS, SCSI, BluRay, DVD, FLASH, USB, ramdisk, etc.
Standards compliance:
* Full compliance with IETF (RFC 3720)
* Full implementation of SPC-4 PRs and ALUA
Significant code cleanups done by Christoph Hellwig.
[jejb: fix up for new block bdev exclusive interface. Minor fixes from
Randy Dunlap and Dan Carpenter.]
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/target/target_core_hba.c b/drivers/target/target_core_hba.c
new file mode 100644
index 0000000..4bbe820
--- /dev/null
+++ b/drivers/target/target_core_hba.c
@@ -0,0 +1,185 @@
+/*******************************************************************************
+ * Filename: target_core_hba.c
+ *
+ * This file copntains the iSCSI HBA Transport related functions.
+ *
+ * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/net.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/in.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_device.h>
+#include <target/target_core_tpg.h>
+#include <target/target_core_transport.h>
+
+#include "target_core_hba.h"
+
+static LIST_HEAD(subsystem_list);
+static DEFINE_MUTEX(subsystem_mutex);
+
+int transport_subsystem_register(struct se_subsystem_api *sub_api)
+{
+ struct se_subsystem_api *s;
+
+ INIT_LIST_HEAD(&sub_api->sub_api_list);
+
+ mutex_lock(&subsystem_mutex);
+ list_for_each_entry(s, &subsystem_list, sub_api_list) {
+ if (!(strcmp(s->name, sub_api->name))) {
+ printk(KERN_ERR "%p is already registered with"
+ " duplicate name %s, unable to process"
+ " request\n", s, s->name);
+ mutex_unlock(&subsystem_mutex);
+ return -EEXIST;
+ }
+ }
+ list_add_tail(&sub_api->sub_api_list, &subsystem_list);
+ mutex_unlock(&subsystem_mutex);
+
+ printk(KERN_INFO "TCM: Registered subsystem plugin: %s struct module:"
+ " %p\n", sub_api->name, sub_api->owner);
+ return 0;
+}
+EXPORT_SYMBOL(transport_subsystem_register);
+
+void transport_subsystem_release(struct se_subsystem_api *sub_api)
+{
+ mutex_lock(&subsystem_mutex);
+ list_del(&sub_api->sub_api_list);
+ mutex_unlock(&subsystem_mutex);
+}
+EXPORT_SYMBOL(transport_subsystem_release);
+
+static struct se_subsystem_api *core_get_backend(const char *sub_name)
+{
+ struct se_subsystem_api *s;
+
+ mutex_lock(&subsystem_mutex);
+ list_for_each_entry(s, &subsystem_list, sub_api_list) {
+ if (!strcmp(s->name, sub_name))
+ goto found;
+ }
+ mutex_unlock(&subsystem_mutex);
+ return NULL;
+found:
+ if (s->owner && !try_module_get(s->owner))
+ s = NULL;
+ mutex_unlock(&subsystem_mutex);
+ return s;
+}
+
+struct se_hba *
+core_alloc_hba(const char *plugin_name, u32 plugin_dep_id, u32 hba_flags)
+{
+ struct se_hba *hba;
+ int ret = 0;
+
+ hba = kzalloc(sizeof(*hba), GFP_KERNEL);
+ if (!hba) {
+ printk(KERN_ERR "Unable to allocate struct se_hba\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ INIT_LIST_HEAD(&hba->hba_dev_list);
+ spin_lock_init(&hba->device_lock);
+ spin_lock_init(&hba->hba_queue_lock);
+ mutex_init(&hba->hba_access_mutex);
+
+ hba->hba_index = scsi_get_new_index(SCSI_INST_INDEX);
+ hba->hba_flags |= hba_flags;
+
+ atomic_set(&hba->max_queue_depth, 0);
+ atomic_set(&hba->left_queue_depth, 0);
+
+ hba->transport = core_get_backend(plugin_name);
+ if (!hba->transport) {
+ ret = -EINVAL;
+ goto out_free_hba;
+ }
+
+ ret = hba->transport->attach_hba(hba, plugin_dep_id);
+ if (ret < 0)
+ goto out_module_put;
+
+ spin_lock(&se_global->hba_lock);
+ hba->hba_id = se_global->g_hba_id_counter++;
+ list_add_tail(&hba->hba_list, &se_global->g_hba_list);
+ spin_unlock(&se_global->hba_lock);
+
+ printk(KERN_INFO "CORE_HBA[%d] - Attached HBA to Generic Target"
+ " Core\n", hba->hba_id);
+
+ return hba;
+
+out_module_put:
+ if (hba->transport->owner)
+ module_put(hba->transport->owner);
+ hba->transport = NULL;
+out_free_hba:
+ kfree(hba);
+ return ERR_PTR(ret);
+}
+
+int
+core_delete_hba(struct se_hba *hba)
+{
+ struct se_device *dev, *dev_tmp;
+
+ spin_lock(&hba->device_lock);
+ list_for_each_entry_safe(dev, dev_tmp, &hba->hba_dev_list, dev_list) {
+
+ se_clear_dev_ports(dev);
+ spin_unlock(&hba->device_lock);
+
+ se_release_device_for_hba(dev);
+
+ spin_lock(&hba->device_lock);
+ }
+ spin_unlock(&hba->device_lock);
+
+ hba->transport->detach_hba(hba);
+
+ spin_lock(&se_global->hba_lock);
+ list_del(&hba->hba_list);
+ spin_unlock(&se_global->hba_lock);
+
+ printk(KERN_INFO "CORE_HBA[%d] - Detached HBA from Generic Target"
+ " Core\n", hba->hba_id);
+
+ if (hba->transport->owner)
+ module_put(hba->transport->owner);
+
+ hba->transport = NULL;
+ kfree(hba);
+ return 0;
+}
