mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 22:00:53 +07:00
3f99306337
Add basic struct iscsit_transport API template to allow iscsi-target for running with external transport modules using existing iscsi_target_core.h code. For all external modules, this calls try_module_get() and module_put() to obtain + release an external iscsit_transport module reference count. Also include the iscsi-target symbols necessary in iscsi_transport.h to allow external transport modules to function. v3 changes: - Add iscsit_build_reject export for ISTATE_SEND_REJECT usage v2 changes: - Drop unnecessary export of iscsit_get_transport + iscsit_put_transport (roland) - Add ->iscsit_queue_data_in() to remove extra context switch on RDMA_WRITE - Add ->iscsit_queue_status() to remove extra context switch on IB_SEND status - Add ->iscsit_get_dataout() to remove extra context switch on RDMA_READ - Drop ->iscsit_free_cmd() - Drop ->iscsit_unmap_cmd() - Rename iscsit_create_transport() -> iscsit_register_transport() (andy) - Rename iscsit_destroy_transport() -> iscsit_unregister_transport() (andy) Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
#include <linux/spinlock.h>
|
|
#include <linux/list.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)
|
|
{
|
|
if (t->owner)
|
|
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);
|