LXR linux/drivers/target/iscsi/iscsi_target

   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        if (t->owner)
  30                module_put(t->owner);
  31}
  32
  33int 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}
  45EXPORT_SYMBOL(iscsit_register_transport);
  46
  47void 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}
  55EXPORT_SYMBOL(iscsit_unregister_transport);
  56