1#include <linux/spinlock.h>
2#include <linux/list.h>
3#include <target/iscsi/iscsi_transport.h>
4
5static LIST_HEAD(g_transport_list);
6static DEFINE_MUTEX(transport_mutex);
7
8struct iscsit_transport *iscsit_get_transport(int type)
9{
10	struct iscsit_transport *t;
11
12	mutex_lock(&transport_mutex);
13	list_for_each_entry(t, &g_transport_list, t_node) {
14		if (t->transport_type == type) {
15			if (t->owner && !try_module_get(t->owner)) {
16				t = NULL;
17			}
18			mutex_unlock(&transport_mutex);
19			return t;
20		}
21	}
22	mutex_unlock(&transport_mutex);
23
24	return NULL;
25}
26
27void iscsit_put_transport(struct iscsit_transport *t)
28{
29	module_put(t->owner);
30}
31
32int iscsit_register_transport(struct iscsit_transport *t)
33{
34	INIT_LIST_HEAD(&t->t_node);
35
36	mutex_lock(&transport_mutex);
37	list_add_tail(&t->t_node, &g_transport_list);
38	mutex_unlock(&transport_mutex);
39
40	pr_debug("Registered iSCSI transport: %s\n", t->name);
41
42	return 0;
43}
44EXPORT_SYMBOL(iscsit_register_transport);
45
46void iscsit_unregister_transport(struct iscsit_transport *t)
47{
48	mutex_lock(&transport_mutex);
49	list_del(&t->t_node);
50	mutex_unlock(&transport_mutex);
51
52	pr_debug("Unregistered iSCSI transport: %s\n", t->name);
53}
54EXPORT_SYMBOL(iscsit_unregister_transport);
55