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#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/module.h>
#include <target/iscsi/iscsi_transport.h>
static LIST_HEAD(g_transport_list);
static DEFINE_MUTEX(transport_mutex);
struct iscsit_transport *iscsit_get_transport(int type)
{
struct iscsit_transport *t;
mutex_lock(&transport_mutex);
list_for_each_entry(t, &g_transport_list, t_node) {
if (t->transport_type == type) {
if (t->owner && !try_module_get(t->owner)) {
t = NULL;
}
mutex_unlock(&transport_mutex);
return t;
}
}
mutex_unlock(&transport_mutex);
return NULL;
}
void iscsit_put_transport(struct iscsit_transport *t)
{
module_put(t->owner);
}
int iscsit_register_transport(struct iscsit_transport *t)
{
INIT_LIST_HEAD(&t->t_node);
mutex_lock(&transport_mutex);
list_add_tail(&t->t_node, &g_transport_list);
mutex_unlock(&transport_mutex);
pr_debug("Registered iSCSI transport: %s\n", t->name);
return 0;
}
EXPORT_SYMBOL(iscsit_register_transport);
void iscsit_unregister_transport(struct iscsit_transport *t)
{
mutex_lock(&transport_mutex);
list_del(&t->t_node);
mutex_unlock(&transport_mutex);
pr_debug("Unregistered iSCSI transport: %s\n", t->name);
}
EXPORT_SYMBOL(iscsit_unregister_transport);
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