thread_add_flags(&pinger_thread, SVC_EVENT);
wake_up(&pinger_thread.t_ctl_waitq);
}
-
-/* Ping evictor thread */
-#define PET_READY 1
-#define PET_TERMINATE 2
-
-static int pet_refcount;
-static int pet_state;
-static wait_queue_head_t pet_waitq;
-static LIST_HEAD(pet_list);
-static DEFINE_SPINLOCK(pet_lock);
-
-int ping_evictor_wake(struct obd_export *exp)
-{
- struct obd_device *obd;
-
- spin_lock(&pet_lock);
- if (pet_state != PET_READY) {
- /* eventually the new obd will call here again. */
- spin_unlock(&pet_lock);
- return 1;
- }
-
- obd = class_exp2obd(exp);
- if (list_empty(&obd->obd_evict_list)) {
- class_incref(obd, "evictor", obd);
- list_add(&obd->obd_evict_list, &pet_list);
- }
- spin_unlock(&pet_lock);
-
- wake_up(&pet_waitq);
- return 0;
-}
-
-static int ping_evictor_main(void *arg)
-{
- struct obd_device *obd;
- struct obd_export *exp;
- struct l_wait_info lwi = { 0 };
- time_t expire_time;
-
- unshare_fs_struct();
-
- CDEBUG(D_HA, "Starting Ping Evictor\n");
- pet_state = PET_READY;
- while (1) {
- l_wait_event(pet_waitq, (!list_empty(&pet_list)) ||
- (pet_state == PET_TERMINATE), &lwi);
-
- /* loop until all obd's will be removed */
- if ((pet_state == PET_TERMINATE) && list_empty(&pet_list))
- break;
-
- /* we only get here if pet_exp != NULL, and the end of this
- * loop is the only place which sets it NULL again, so lock
- * is not strictly necessary. */
- spin_lock(&pet_lock);
- obd = list_entry(pet_list.next, struct obd_device,
- obd_evict_list);
- spin_unlock(&pet_lock);
-
- expire_time = get_seconds() - PING_EVICT_TIMEOUT;
-
- CDEBUG(D_HA, "evicting all exports of obd %s older than %ld\n",
- obd->obd_name, expire_time);
-
- /* Exports can't be deleted out of the list while we hold
- * the obd lock (class_unlink_export), which means we can't
- * lose the last ref on the export. If they've already been
- * removed from the list, we won't find them here. */
- spin_lock(&obd->obd_dev_lock);
- while (!list_empty(&obd->obd_exports_timed)) {
- exp = list_entry(obd->obd_exports_timed.next,
- struct obd_export,
- exp_obd_chain_timed);
- if (expire_time > exp->exp_last_request_time) {
- class_export_get(exp);
- spin_unlock(&obd->obd_dev_lock);
- LCONSOLE_WARN("%s: haven't heard from client %s (at %s) in %ld seconds. I think it's dead, and I am evicting it. exp %p, cur %ld expire %ld last %ld\n",
- obd->obd_name,
- obd_uuid2str(&exp->exp_client_uuid),
- obd_export_nid2str(exp),
- (long)(get_seconds() -
- exp->exp_last_request_time),
- exp, (long)get_seconds(),
- (long)expire_time,
- (long)exp->exp_last_request_time);
- CDEBUG(D_HA, "Last request was at %ld\n",
- exp->exp_last_request_time);
- class_fail_export(exp);
- class_export_put(exp);
- spin_lock(&obd->obd_dev_lock);
- } else {
- /* List is sorted, so everyone below is ok */
- break;
- }
- }
- spin_unlock(&obd->obd_dev_lock);
-
- spin_lock(&pet_lock);
- list_del_init(&obd->obd_evict_list);
- spin_unlock(&pet_lock);
-
- class_decref(obd, "evictor", obd);
- }
- CDEBUG(D_HA, "Exiting Ping Evictor\n");
-
- return 0;
-}
-
-void ping_evictor_start(void)
-{
- struct task_struct *task;
-
- if (++pet_refcount > 1)
- return;
-
- init_waitqueue_head(&pet_waitq);
-
- task = kthread_run(ping_evictor_main, NULL, "ll_evictor");
- if (IS_ERR(task)) {
- pet_refcount--;
- CERROR("Cannot start ping evictor thread: %ld\n",
- PTR_ERR(task));
- }
-}
-EXPORT_SYMBOL(ping_evictor_start);
-
-void ping_evictor_stop(void)
-{
- if (--pet_refcount > 0)
- return;
-
- pet_state = PET_TERMINATE;
- wake_up(&pet_waitq);
-}
-EXPORT_SYMBOL(ping_evictor_stop);
struct obd_export, exp_obd_chain_timed);
oldest_time = oldest_exp->exp_last_request_time;
spin_unlock(&exp->exp_obd->obd_dev_lock);
-
- if (exp->exp_obd->obd_recovering) {
- /* be nice to everyone during recovery */
- return;
- }
-
- /* Note - racing to start/reset the obd_eviction timer is safe */
- if (exp->exp_obd->obd_eviction_timer == 0) {
- /* Check if the oldest entry is expired. */
- if (get_seconds() > (oldest_time + PING_EVICT_TIMEOUT +
- extra_delay)) {
- /* We need a second timer, in case the net was down and
- * it just came back. Since the pinger may skip every
- * other PING_INTERVAL (see note in ptlrpc_pinger_main),
- * we better wait for 3. */
- exp->exp_obd->obd_eviction_timer =
- get_seconds() + 3 * PING_INTERVAL;
- CDEBUG(D_HA, "%s: Think about evicting %s from "CFS_TIME_T"\n",
- exp->exp_obd->obd_name,
- obd_export_nid2str(oldest_exp), oldest_time);
- }
- } else {
- if (get_seconds() >
- (exp->exp_obd->obd_eviction_timer + extra_delay)) {
- /* The evictor won't evict anyone who we've heard from
- * recently, so we don't have to check before we start
- * it. */
- if (!ping_evictor_wake(exp))
- exp->exp_obd->obd_eviction_timer = 0;
- }
- }
}
/**
projects / openwrt / staging / blogic.git / commitdiff