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Commit | Line | Data |
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3f993063 NB |
1 | #include <linux/spinlock.h> |
2 | #include <linux/list.h> | |
3 | #include <target/iscsi/iscsi_transport.h> | |
4 | ||
5 | static LIST_HEAD(g_transport_list); | |
6 | static DEFINE_MUTEX(transport_mutex); | |
7 | ||
8 | struct 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 | ||
27 | void iscsit_put_transport(struct iscsit_transport *t) | |
28 | { | |
29 | if (t->owner) | |
30 | module_put(t->owner); | |
31 | } | |
32 | ||
33 | int iscsit_register_transport(struct iscsit_transport *t) | |
34 | { | |
35 | INIT_LIST_HEAD(&t->t_node); | |
36 | ||
37 | mutex_lock(&transport_mutex); | |
38 | list_add_tail(&t->t_node, &g_transport_list); | |
39 | mutex_unlock(&transport_mutex); | |
40 | ||
41 | pr_debug("Registered iSCSI transport: %s\n", t->name); | |
42 | ||
43 | return 0; | |
44 | } | |
45 | EXPORT_SYMBOL(iscsit_register_transport); | |
46 | ||
47 | void iscsit_unregister_transport(struct iscsit_transport *t) | |
48 | { | |
49 | mutex_lock(&transport_mutex); | |
50 | list_del(&t->t_node); | |
51 | mutex_unlock(&transport_mutex); | |
52 | ||
53 | pr_debug("Unregistered iSCSI transport: %s\n", t->name); | |
54 | } | |
55 | EXPORT_SYMBOL(iscsit_unregister_transport); |