struct iscsi_thread_set *iscsi_get_thread_set(void)
{
int allocate_ts = 0;
struct completion comp;
struct iscsi_thread_set *ts = NULL;
/*
* If no inactive thread set is available on the first call to
* iscsi_get_ts_from_inactive_list(), sleep for a second and
* try again. If still none are available after two attempts,
* allocate a set ourselves.
*/
get_set:
ts = iscsi_get_ts_from_inactive_list();
if (!ts) {
if (allocate_ts == 2)
iscsi_allocate_thread_sets(1);
init_completion(&comp);
wait_for_completion_timeout(&comp, 1 * HZ);
allocate_ts++;
goto get_set;
}
ts->delay_inactive = 1;
ts->signal_sent = 0;
ts->thread_count = 3;
init_completion(&ts->rx_restart_comp);
init_completion(&ts->tx_restart_comp);
init_completion(&ts->deferred_restart_comp);
return ts;
}
struct iscsi_thread_set *iscsi_get_thread_set(void)
{
int allocate_ts = 0;
struct completion comp;
struct iscsi_thread_set *ts = NULL;
/*
*/
get_set:
ts = iscsi_get_ts_from_inactive_list();
if (!ts) {
if (allocate_ts == 2)
iscsi_allocate_thread_sets(1);
init_completion(&comp);
wait_for_completion_timeout(&comp, 1 * HZ);
allocate_ts++;
goto get_set;
}
ts->delay_inactive = 1;
ts->signal_sent = 0;
ts->thread_count = 2;
init_completion(&ts->rx_restart_comp);
init_completion(&ts->tx_restart_comp);
return ts;
}
void iscsi_deallocate_thread_sets(void)
{
u32 released_count = 0;
struct iscsi_thread_set *ts = NULL;
while ((ts = iscsi_get_ts_from_inactive_list())) {
spin_lock_bh(&ts->ts_state_lock);
ts->status = ISCSI_THREAD_SET_DIE;
spin_unlock_bh(&ts->ts_state_lock);
if (ts->rx_thread) {
send_sig(SIGINT, ts->rx_thread, 1);
kthread_stop(ts->rx_thread);
}
if (ts->tx_thread) {
send_sig(SIGINT, ts->tx_thread, 1);
kthread_stop(ts->tx_thread);
}
/*
* Release this thread_id in the thread_set_bitmap
*/
spin_lock(&ts_bitmap_lock);
bitmap_release_region(iscsit_global->ts_bitmap,
ts->thread_id, get_order(1));
spin_unlock(&ts_bitmap_lock);
released_count++;
kfree(ts);
}
if (released_count)
pr_debug("Stopped %d thread set(s) (%d total threads)."
"\n", released_count, released_count * 2);
}
static void iscsi_deallocate_extra_thread_sets(void)
{
u32 orig_count, released_count = 0;
struct iscsi_thread_set *ts = NULL;
orig_count = TARGET_THREAD_SET_COUNT;
while ((iscsit_global->inactive_ts + 1) > orig_count) {
ts = iscsi_get_ts_from_inactive_list();
if (!ts)
break;
spin_lock_bh(&ts->ts_state_lock);
ts->status = ISCSI_THREAD_SET_DIE;
spin_unlock_bh(&ts->ts_state_lock);
if (ts->rx_thread) {
send_sig(SIGINT, ts->rx_thread, 1);
kthread_stop(ts->rx_thread);
}
if (ts->tx_thread) {
send_sig(SIGINT, ts->tx_thread, 1);
kthread_stop(ts->tx_thread);
}
/*
*/
spin_lock(&ts_bitmap_lock);
bitmap_release_region(iscsit_global->ts_bitmap,
ts->thread_id, get_order(1));
spin_unlock(&ts_bitmap_lock);
released_count++;
kfree(ts);
}
if (released_count) {
pr_debug("Stopped %d thread set(s) (%d total threads)."
"\n", released_count, released_count * 2);
}
}
