![Nicholas Bellinger](/assets/img/avatar_default.png)
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>
186 lines
4.9 KiB
C
186 lines
4.9 KiB
C
/*******************************************************************************
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* Filename: target_core_hba.c
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*
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* This file copntains the iSCSI HBA Transport related functions.
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*
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* Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
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* Copyright (c) 2005, 2006, 2007 SBE, Inc.
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* Copyright (c) 2007-2010 Rising Tide Systems
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* Copyright (c) 2008-2010 Linux-iSCSI.org
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*
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* Nicholas A. Bellinger <nab@kernel.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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******************************************************************************/
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#include <linux/net.h>
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/smp_lock.h>
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#include <linux/in.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#include <target/target_core_base.h>
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#include <target/target_core_device.h>
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#include <target/target_core_device.h>
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#include <target/target_core_tpg.h>
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#include <target/target_core_transport.h>
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#include "target_core_hba.h"
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static LIST_HEAD(subsystem_list);
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static DEFINE_MUTEX(subsystem_mutex);
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int transport_subsystem_register(struct se_subsystem_api *sub_api)
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{
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struct se_subsystem_api *s;
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INIT_LIST_HEAD(&sub_api->sub_api_list);
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mutex_lock(&subsystem_mutex);
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list_for_each_entry(s, &subsystem_list, sub_api_list) {
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if (!(strcmp(s->name, sub_api->name))) {
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printk(KERN_ERR "%p is already registered with"
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" duplicate name %s, unable to process"
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" request\n", s, s->name);
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mutex_unlock(&subsystem_mutex);
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return -EEXIST;
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}
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}
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list_add_tail(&sub_api->sub_api_list, &subsystem_list);
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mutex_unlock(&subsystem_mutex);
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printk(KERN_INFO "TCM: Registered subsystem plugin: %s struct module:"
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" %p\n", sub_api->name, sub_api->owner);
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return 0;
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}
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EXPORT_SYMBOL(transport_subsystem_register);
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void transport_subsystem_release(struct se_subsystem_api *sub_api)
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{
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mutex_lock(&subsystem_mutex);
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list_del(&sub_api->sub_api_list);
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mutex_unlock(&subsystem_mutex);
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}
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EXPORT_SYMBOL(transport_subsystem_release);
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static struct se_subsystem_api *core_get_backend(const char *sub_name)
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{
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struct se_subsystem_api *s;
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mutex_lock(&subsystem_mutex);
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list_for_each_entry(s, &subsystem_list, sub_api_list) {
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if (!strcmp(s->name, sub_name))
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goto found;
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}
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mutex_unlock(&subsystem_mutex);
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return NULL;
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found:
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if (s->owner && !try_module_get(s->owner))
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s = NULL;
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mutex_unlock(&subsystem_mutex);
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return s;
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}
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struct se_hba *
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core_alloc_hba(const char *plugin_name, u32 plugin_dep_id, u32 hba_flags)
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{
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struct se_hba *hba;
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int ret = 0;
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hba = kzalloc(sizeof(*hba), GFP_KERNEL);
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if (!hba) {
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printk(KERN_ERR "Unable to allocate struct se_hba\n");
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return ERR_PTR(-ENOMEM);
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}
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INIT_LIST_HEAD(&hba->hba_dev_list);
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spin_lock_init(&hba->device_lock);
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spin_lock_init(&hba->hba_queue_lock);
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mutex_init(&hba->hba_access_mutex);
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hba->hba_index = scsi_get_new_index(SCSI_INST_INDEX);
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hba->hba_flags |= hba_flags;
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atomic_set(&hba->max_queue_depth, 0);
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atomic_set(&hba->left_queue_depth, 0);
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hba->transport = core_get_backend(plugin_name);
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if (!hba->transport) {
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ret = -EINVAL;
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goto out_free_hba;
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}
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ret = hba->transport->attach_hba(hba, plugin_dep_id);
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if (ret < 0)
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goto out_module_put;
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spin_lock(&se_global->hba_lock);
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hba->hba_id = se_global->g_hba_id_counter++;
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list_add_tail(&hba->hba_list, &se_global->g_hba_list);
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spin_unlock(&se_global->hba_lock);
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printk(KERN_INFO "CORE_HBA[%d] - Attached HBA to Generic Target"
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" Core\n", hba->hba_id);
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return hba;
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out_module_put:
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if (hba->transport->owner)
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module_put(hba->transport->owner);
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hba->transport = NULL;
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out_free_hba:
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kfree(hba);
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return ERR_PTR(ret);
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}
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int
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core_delete_hba(struct se_hba *hba)
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{
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struct se_device *dev, *dev_tmp;
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spin_lock(&hba->device_lock);
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list_for_each_entry_safe(dev, dev_tmp, &hba->hba_dev_list, dev_list) {
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se_clear_dev_ports(dev);
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spin_unlock(&hba->device_lock);
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se_release_device_for_hba(dev);
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spin_lock(&hba->device_lock);
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}
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spin_unlock(&hba->device_lock);
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hba->transport->detach_hba(hba);
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spin_lock(&se_global->hba_lock);
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list_del(&hba->hba_list);
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spin_unlock(&se_global->hba_lock);
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printk(KERN_INFO "CORE_HBA[%d] - Detached HBA from Generic Target"
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" Core\n", hba->hba_id);
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if (hba->transport->owner)
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module_put(hba->transport->owner);
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hba->transport = NULL;
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kfree(hba);
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return 0;
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}
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