LXR linux/drivers/target/iscsi/iscsi_target

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/spinlock.h>
   3#include <linux/list.h>
   4#include <linux/module.h>
   5#include <target/iscsi/iscsi_transport.h>
   6
   7static LIST_HEAD(g_transport_list);
   8static DEFINE_MUTEX(transport_mutex);
   9
  10struct iscsit_transport *iscsit_get_transport(int type)
  11{
  12        struct iscsit_transport *t;
  13
  14        mutex_lock(&transport_mutex);
  15        list_for_each_entry(t, &g_transport_list, t_node) {
  16                if (t->transport_type == type) {
  17                        if (t->owner && !try_module_get(t->owner)) {
  18                                t = NULL;
  19                        }
  20                        mutex_unlock(&transport_mutex);
  21                        return t;
  22                }
  23        }
  24        mutex_unlock(&transport_mutex);
  25
  26        return NULL;
  27}
  28
  29void iscsit_put_transport(struct iscsit_transport *t)
  30{
  31        module_put(t->owner);
  32}
  33
  34void iscsit_register_transport(struct iscsit_transport *t)
  35{
  36        INIT_LIST_HEAD(&t->t_node);
  37
  38        mutex_lock(&transport_mutex);
  39        list_add_tail(&t->t_node, &g_transport_list);
  40        mutex_unlock(&transport_mutex);
  41
  42        pr_debug("Registered iSCSI transport: %s\n", t->name);
  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