1 files changed, 460 insertions, 141 deletions

diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
index 805cbabac051..594745fab0b5 100644
--- a/fs/ocfs2/dlm/dlmrecovery.c
+++ b/fs/ocfs2/dlm/dlmrecovery.c
@@ -95,11 +95,14 @@ static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st);
 static void dlm_request_all_locks_worker(struct dlm_work_item *item,
 					 void *data);
 static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data);
+static int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
+				      struct dlm_lock_resource *res,
+				      u8 *real_master);
 
 static u64 dlm_get_next_mig_cookie(void);
 
-static spinlock_t dlm_reco_state_lock = SPIN_LOCK_UNLOCKED;
-static spinlock_t dlm_mig_cookie_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(dlm_reco_state_lock);
+static DEFINE_SPINLOCK(dlm_mig_cookie_lock);
 static u64 dlm_mig_cookie = 1;
 
 static u64 dlm_get_next_mig_cookie(void)
@@ -115,12 +118,37 @@ static u64 dlm_get_next_mig_cookie(void)
 	return c;
 }
 
+static inline void dlm_set_reco_dead_node(struct dlm_ctxt *dlm,
+					  u8 dead_node)
+{
+	assert_spin_locked(&dlm->spinlock);
+	if (dlm->reco.dead_node != dead_node)
+		mlog(0, "%s: changing dead_node from %u to %u\n",
+		     dlm->name, dlm->reco.dead_node, dead_node);
+	dlm->reco.dead_node = dead_node;
+}
+
+static inline void dlm_set_reco_master(struct dlm_ctxt *dlm,
+				       u8 master)
+{
+	assert_spin_locked(&dlm->spinlock);
+	mlog(0, "%s: changing new_master from %u to %u\n",
+	     dlm->name, dlm->reco.new_master, master);
+	dlm->reco.new_master = master;
+}
+
+static inline void __dlm_reset_recovery(struct dlm_ctxt *dlm)
+{
+	assert_spin_locked(&dlm->spinlock);
+	clear_bit(dlm->reco.dead_node, dlm->recovery_map);
+	dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM);
+	dlm_set_reco_master(dlm, O2NM_INVALID_NODE_NUM);
+}
+
 static inline void dlm_reset_recovery(struct dlm_ctxt *dlm)
 {
 	spin_lock(&dlm->spinlock);
-	clear_bit(dlm->reco.dead_node, dlm->recovery_map);
-	dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
-	dlm->reco.new_master = O2NM_INVALID_NODE_NUM;
+	__dlm_reset_recovery(dlm);
 	spin_unlock(&dlm->spinlock);
 }
 
@@ -132,12 +160,21 @@ void dlm_dispatch_work(void *data)
 	struct list_head *iter, *iter2;
 	struct dlm_work_item *item;
 	dlm_workfunc_t *workfunc;
+	int tot=0;
+
+	if (!dlm_joined(dlm))
+		return;
 
 	spin_lock(&dlm->work_lock);
 	list_splice_init(&dlm->work_list, &tmp_list);
 	spin_unlock(&dlm->work_lock);
 
 	list_for_each_safe(iter, iter2, &tmp_list) {
+		tot++;
+	}
+	mlog(0, "%s: work thread has %d work items\n", dlm->name, tot);
+
+	list_for_each_safe(iter, iter2, &tmp_list) {
 		item = list_entry(iter, struct dlm_work_item, list);
 		workfunc = item->func;
 		list_del_init(&item->list);
@@ -220,6 +257,52 @@ void dlm_complete_recovery_thread(struct dlm_ctxt *dlm)
  *
  */
 
+static void dlm_print_reco_node_status(struct dlm_ctxt *dlm)
+{
+	struct dlm_reco_node_data *ndata;
+	struct dlm_lock_resource *res;
+
+	mlog(ML_NOTICE, "%s(%d): recovery info, state=%s, dead=%u, master=%u\n",
+	     dlm->name, dlm->dlm_reco_thread_task->pid,
+	     dlm->reco.state & DLM_RECO_STATE_ACTIVE ? "ACTIVE" : "inactive",
+	     dlm->reco.dead_node, dlm->reco.new_master);
+
+	list_for_each_entry(ndata, &dlm->reco.node_data, list) {
+		char *st = "unknown";
+		switch (ndata->state) {
+			case DLM_RECO_NODE_DATA_INIT:
+				st = "init";
+				break;
+			case DLM_RECO_NODE_DATA_REQUESTING:
+				st = "requesting";
+				break;
+			case DLM_RECO_NODE_DATA_DEAD:
+				st = "dead";
+				break;
+			case DLM_RECO_NODE_DATA_RECEIVING:
+				st = "receiving";
+				break;
+			case DLM_RECO_NODE_DATA_REQUESTED:
+				st = "requested";
+				break;
+			case DLM_RECO_NODE_DATA_DONE:
+				st = "done";
+				break;
+			case DLM_RECO_NODE_DATA_FINALIZE_SENT:
+				st = "finalize-sent";
+				break;
+			default:
+				st = "bad";
+				break;
+		}
+		mlog(ML_NOTICE, "%s: reco state, node %u, state=%s\n",
+		     dlm->name, ndata->node_num, st);
+	}
+	list_for_each_entry(res, &dlm->reco.resources, recovering) {
+		mlog(ML_NOTICE, "%s: lockres %.*s on recovering list\n",
+		     dlm->name, res->lockname.len, res->lockname.name);
+	}
+}
 
 #define DLM_RECO_THREAD_TIMEOUT_MS (5 * 1000)
 
@@ -267,11 +350,23 @@ int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node)
 {
 	int dead;
 	spin_lock(&dlm->spinlock);
-	dead = test_bit(node, dlm->domain_map);
+	dead = !test_bit(node, dlm->domain_map);
 	spin_unlock(&dlm->spinlock);
 	return dead;
 }
 
+/* returns true if node is no longer in the domain
+ * could be dead or just not joined */
+static int dlm_is_node_recovered(struct dlm_ctxt *dlm, u8 node)
+{
+	int recovered;
+	spin_lock(&dlm->spinlock);
+	recovered = !test_bit(node, dlm->recovery_map);
+	spin_unlock(&dlm->spinlock);
+	return recovered;
+}
+
+
 int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout)
 {
 	if (timeout) {
@@ -290,6 +385,24 @@ int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout)
 	return 0;
 }
 
+int dlm_wait_for_node_recovery(struct dlm_ctxt *dlm, u8 node, int timeout)
+{
+	if (timeout) {
+		mlog(0, "%s: waiting %dms for notification of "
+		     "recovery of node %u\n", dlm->name, timeout, node);
+		wait_event_timeout(dlm->dlm_reco_thread_wq,
+			   dlm_is_node_recovered(dlm, node),
+			   msecs_to_jiffies(timeout));
+	} else {
+		mlog(0, "%s: waiting indefinitely for notification "
+		     "of recovery of node %u\n", dlm->name, node);
+		wait_event(dlm->dlm_reco_thread_wq,
+			   dlm_is_node_recovered(dlm, node));
+	}
+	/* for now, return 0 */
+	return 0;
+}
+
 /* callers of the top-level api calls (dlmlock/dlmunlock) should
  * block on the dlm->reco.event when recovery is in progress.
  * the dlm recovery thread will set this state when it begins
@@ -308,6 +421,13 @@ static int dlm_in_recovery(struct dlm_ctxt *dlm)
 
 void dlm_wait_for_recovery(struct dlm_ctxt *dlm)
 {
+	if (dlm_in_recovery(dlm)) {
+		mlog(0, "%s: reco thread %d in recovery: "
+		     "state=%d, master=%u, dead=%u\n",
+		     dlm->name, dlm->dlm_reco_thread_task->pid,
+		     dlm->reco.state, dlm->reco.new_master,
+		     dlm->reco.dead_node);
+	}
 	wait_event(dlm->reco.event, !dlm_in_recovery(dlm));
 }
 
@@ -341,7 +461,7 @@ static int dlm_do_recovery(struct dlm_ctxt *dlm)
 		mlog(0, "new master %u died while recovering %u!\n",
 		     dlm->reco.new_master, dlm->reco.dead_node);
 		/* unset the new_master, leave dead_node */
-		dlm->reco.new_master = O2NM_INVALID_NODE_NUM;
+		dlm_set_reco_master(dlm, O2NM_INVALID_NODE_NUM);
 	}
 
 	/* select a target to recover */
@@ -350,14 +470,14 @@ static int dlm_do_recovery(struct dlm_ctxt *dlm)
 
 		bit = find_next_bit (dlm->recovery_map, O2NM_MAX_NODES+1, 0);
 		if (bit >= O2NM_MAX_NODES || bit < 0)
-			dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
+			dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM);
 		else
-			dlm->reco.dead_node = bit;
+			dlm_set_reco_dead_node(dlm, bit);
 	} else if (!test_bit(dlm->reco.dead_node, dlm->recovery_map)) {
 		/* BUG? */
 		mlog(ML_ERROR, "dead_node %u no longer in recovery map!\n",
 		     dlm->reco.dead_node);
-		dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
+		dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM);
 	}
 
 	if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
@@ -366,7 +486,8 @@ static int dlm_do_recovery(struct dlm_ctxt *dlm)
 		/* return to main thread loop and sleep. */
 		return 0;
 	}
-	mlog(0, "recovery thread found node %u in the recovery map!\n",
+	mlog(0, "%s(%d):recovery thread found node %u in the recovery map!\n",
+	     dlm->name, dlm->dlm_reco_thread_task->pid,
 	     dlm->reco.dead_node);
 	spin_unlock(&dlm->spinlock);
 
@@ -389,8 +510,8 @@ static int dlm_do_recovery(struct dlm_ctxt *dlm)
 		}
 		mlog(0, "another node will master this recovery session.\n");
 	}
-	mlog(0, "dlm=%s, new_master=%u, this node=%u, dead_node=%u\n",
-	     dlm->name, dlm->reco.new_master,
+	mlog(0, "dlm=%s (%d), new_master=%u, this node=%u, dead_node=%u\n",
+	     dlm->name, dlm->dlm_reco_thread_task->pid, dlm->reco.new_master,
 	     dlm->node_num, dlm->reco.dead_node);
 
 	/* it is safe to start everything back up here
@@ -402,11 +523,13 @@ static int dlm_do_recovery(struct dlm_ctxt *dlm)
 	return 0;
 
 master_here:
-	mlog(0, "mastering recovery of %s:%u here(this=%u)!\n",
+	mlog(0, "(%d) mastering recovery of %s:%u here(this=%u)!\n",
+	     dlm->dlm_reco_thread_task->pid,
 	     dlm->name, dlm->reco.dead_node, dlm->node_num);
 
 	status = dlm_remaster_locks(dlm, dlm->reco.dead_node);
 	if (status < 0) {
+		/* we should never hit this anymore */
 		mlog(ML_ERROR, "error %d remastering locks for node %u, "
 		     "retrying.\n", status, dlm->reco.dead_node);
 		/* yield a bit to allow any final network messages
@@ -433,9 +556,16 @@ static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
 	int destroy = 0;
 	int pass = 0;
 
-	status = dlm_init_recovery_area(dlm, dead_node);
-	if (status < 0)
-		goto leave;
+	do {
+		/* we have become recovery master.  there is no escaping
+		 * this, so just keep trying until we get it. */
+		status = dlm_init_recovery_area(dlm, dead_node);
+		if (status < 0) {
+			mlog(ML_ERROR, "%s: failed to alloc recovery area, "
+			     "retrying\n", dlm->name);
+			msleep(1000);
+		}
+	} while (status != 0);
 
 	/* safe to access the node data list without a lock, since this
 	 * process is the only one to change the list */
@@ -452,16 +582,36 @@ static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
 			continue;
 		}
 
-		status = dlm_request_all_locks(dlm, ndata->node_num, dead_node);
-		if (status < 0) {
-			mlog_errno(status);
-			if (dlm_is_host_down(status))
-				ndata->state = DLM_RECO_NODE_DATA_DEAD;
-			else {
-				destroy = 1;
-				goto leave;
+		do {
+			status = dlm_request_all_locks(dlm, ndata->node_num,
+						       dead_node);
+			if (status < 0) {
+				mlog_errno(status);
+				if (dlm_is_host_down(status)) {
+					/* node died, ignore it for recovery */
+					status = 0;
+					ndata->state = DLM_RECO_NODE_DATA_DEAD;
+					/* wait for the domain map to catch up
+					 * with the network state. */
+					wait_event_timeout(dlm->dlm_reco_thread_wq,
+							   dlm_is_node_dead(dlm,
+								ndata->node_num),
+							   msecs_to_jiffies(1000));
+					mlog(0, "waited 1 sec for %u, "
+					     "dead? %s\n", ndata->node_num,
+					     dlm_is_node_dead(dlm, ndata->node_num) ?
+					     "yes" : "no");
+				} else {
+					/* -ENOMEM on the other node */
+					mlog(0, "%s: node %u returned "
+					     "%d during recovery, retrying "
+					     "after a short wait\n",
+					     dlm->name, ndata->node_num,
+					     status);
+					msleep(100);
+				}
 			}
-		}
+		} while (status != 0);
 
 		switch (ndata->state) {
 			case DLM_RECO_NODE_DATA_INIT:
@@ -473,10 +623,9 @@ static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
 				mlog(0, "node %u died after requesting "
 				     "recovery info for node %u\n",
 				     ndata->node_num, dead_node);
-				// start all over
-				destroy = 1;
-				status = -EAGAIN;
-				goto leave;
+				/* fine.  don't need this node's info.
+				 * continue without it. */
+				break;
 			case DLM_RECO_NODE_DATA_REQUESTING:
 				ndata->state = DLM_RECO_NODE_DATA_REQUESTED;
 				mlog(0, "now receiving recovery data from "
@@ -520,35 +669,26 @@ static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
 					BUG();
 					break;
 				case DLM_RECO_NODE_DATA_DEAD:
-					mlog(ML_NOTICE, "node %u died after "
+					mlog(0, "node %u died after "
 					     "requesting recovery info for "
 					     "node %u\n", ndata->node_num,
 					     dead_node);
-					spin_unlock(&dlm_reco_state_lock);
-					// start all over
-					destroy = 1;
-					status = -EAGAIN;
-					/* instead of spinning like crazy here,
-					 * wait for the domain map to catch up
-					 * with the network state.  otherwise this
-					 * can be hit hundreds of times before
-					 * the node is really seen as dead. */
-					wait_event_timeout(dlm->dlm_reco_thread_wq,
-							   dlm_is_node_dead(dlm,
-								ndata->node_num),
-							   msecs_to_jiffies(1000));
-					mlog(0, "waited 1 sec for %u, "
-					     "dead? %s\n", ndata->node_num,
-					     dlm_is_node_dead(dlm, ndata->node_num) ?
-					     "yes" : "no");
-					goto leave;
+					break;
 				case DLM_RECO_NODE_DATA_RECEIVING:
 				case DLM_RECO_NODE_DATA_REQUESTED:
+					mlog(0, "%s: node %u still in state %s\n",
+					     dlm->name, ndata->node_num,
+					     ndata->state==DLM_RECO_NODE_DATA_RECEIVING ?
+					     "receiving" : "requested");
 					all_nodes_done = 0;
 					break;
 				case DLM_RECO_NODE_DATA_DONE:
+					mlog(0, "%s: node %u state is done\n",
+					     dlm->name, ndata->node_num);
 					break;
 				case DLM_RECO_NODE_DATA_FINALIZE_SENT:
+					mlog(0, "%s: node %u state is finalize\n",
+					     dlm->name, ndata->node_num);
 					break;
 			}
 		}
@@ -578,7 +718,7 @@ static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
 			     jiffies, dlm->reco.dead_node,
 			     dlm->node_num, dlm->reco.new_master);
 			destroy = 1;
-			status = ret;
+			status = 0;
 			/* rescan everything marked dirty along the way */
 			dlm_kick_thread(dlm, NULL);
 			break;
@@ -591,7 +731,6 @@ static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
 
 	}
 
-leave:
 	if (destroy)
 		dlm_destroy_recovery_area(dlm, dead_node);
 
@@ -617,7 +756,7 @@ static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node)
 		}
 		BUG_ON(num == dead_node);
 
-		ndata = kcalloc(1, sizeof(*ndata), GFP_KERNEL);
+		ndata = kcalloc(1, sizeof(*ndata), GFP_NOFS);
 		if (!ndata) {
 			dlm_destroy_recovery_area(dlm, dead_node);
 			return -ENOMEM;
@@ -691,16 +830,25 @@ int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data)
 	if (!dlm_grab(dlm))
 		return -EINVAL;
 
+	if (lr->dead_node != dlm->reco.dead_node) {
+		mlog(ML_ERROR, "%s: node %u sent dead_node=%u, but local "
+		     "dead_node is %u\n", dlm->name, lr->node_idx,
+		     lr->dead_node, dlm->reco.dead_node);
+		dlm_print_reco_node_status(dlm);
+		/* this is a hack */
+		dlm_put(dlm);
+		return -ENOMEM;
+	}
 	BUG_ON(lr->dead_node != dlm->reco.dead_node);
 
-	item = kcalloc(1, sizeof(*item), GFP_KERNEL);
+	item = kcalloc(1, sizeof(*item), GFP_NOFS);
 	if (!item) {
 		dlm_put(dlm);
 		return -ENOMEM;
 	}
 
 	/* this will get freed by dlm_request_all_locks_worker */
-	buf = (char *) __get_free_page(GFP_KERNEL);
+	buf = (char *) __get_free_page(GFP_NOFS);
 	if (!buf) {
 		kfree(item);
 		dlm_put(dlm);
@@ -715,7 +863,7 @@ int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data)
 	spin_lock(&dlm->work_lock);
 	list_add_tail(&item->list, &dlm->work_list);
 	spin_unlock(&dlm->work_lock);
-	schedule_work(&dlm->dispatched_work);
+	queue_work(dlm->dlm_worker, &dlm->dispatched_work);
 
 	dlm_put(dlm);
 	return 0;
@@ -730,32 +878,34 @@ static void dlm_request_all_locks_worker(struct dlm_work_item *item, void *data)
 	struct list_head *iter;
 	int ret;
 	u8 dead_node, reco_master;
+	int skip_all_done = 0;
 
 	dlm = item->dlm;
 	dead_node = item->u.ral.dead_node;
 	reco_master = item->u.ral.reco_master;
 	mres = (struct dlm_migratable_lockres *)data;
 
+	mlog(0, "%s: recovery worker started, dead=%u, master=%u\n",
+	     dlm->name, dead_node, reco_master);
+
 	if (dead_node != dlm->reco.dead_node ||
 	    reco_master != dlm->reco.new_master) {
-		/* show extra debug info if the recovery state is messed */
-		mlog(ML_ERROR, "%s: bad reco state: reco(dead=%u, master=%u), "
-		     "request(dead=%u, master=%u)\n",
-		     dlm->name, dlm->reco.dead_node, dlm->reco.new_master,
-		     dead_node, reco_master);
-		mlog(ML_ERROR, "%s: name=%.*s master=%u locks=%u/%u flags=%u "
-		     "entry[0]={c=%u:%llu,l=%u,f=%u,t=%d,ct=%d,hb=%d,n=%u}\n",
-		     dlm->name, mres->lockname_len, mres->lockname, mres->master,
-		     mres->num_locks, mres->total_locks, mres->flags,
-		     dlm_get_lock_cookie_node(mres->ml[0].cookie),
-		     dlm_get_lock_cookie_seq(mres->ml[0].cookie),
-		     mres->ml[0].list, mres->ml[0].flags,
-		     mres->ml[0].type, mres->ml[0].convert_type,
-		     mres->ml[0].highest_blocked, mres->ml[0].node);
-		BUG();
+		/* worker could have been created before the recovery master
+		 * died.  if so, do not continue, but do not error. */
+		if (dlm->reco.new_master == O2NM_INVALID_NODE_NUM) {
+			mlog(ML_NOTICE, "%s: will not send recovery state, "
+			     "recovery master %u died, thread=(dead=%u,mas=%u)"
+			     " current=(dead=%u,mas=%u)\n", dlm->name,
+			     reco_master, dead_node, reco_master,
+			     dlm->reco.dead_node, dlm->reco.new_master);
+		} else {
+			mlog(ML_NOTICE, "%s: reco state invalid: reco(dead=%u, "
+			     "master=%u), request(dead=%u, master=%u)\n",
+			     dlm->name, dlm->reco.dead_node,
+			     dlm->reco.new_master, dead_node, reco_master);
+		}
+		goto leave;
 	}
-	BUG_ON(dead_node != dlm->reco.dead_node);
-	BUG_ON(reco_master != dlm->reco.new_master);
 
 	/* lock resources should have already been moved to the
  	 * dlm->reco.resources list.  now move items from that list
@@ -766,12 +916,20 @@ static void dlm_request_all_locks_worker(struct dlm_work_item *item, void *data)
 	dlm_move_reco_locks_to_list(dlm, &resources, dead_node);
 
 	/* now we can begin blasting lockreses without the dlm lock */
+
+	/* any errors returned will be due to the new_master dying,
+	 * the dlm_reco_thread should detect this */
 	list_for_each(iter, &resources) {
 		res = list_entry (iter, struct dlm_lock_resource, recovering);
 		ret = dlm_send_one_lockres(dlm, res, mres, reco_master,
 				   	DLM_MRES_RECOVERY);
-		if (ret < 0)
-			mlog_errno(ret);
+		if (ret < 0) {
+			mlog(ML_ERROR, "%s: node %u went down while sending "
+			     "recovery state for dead node %u, ret=%d\n", dlm->name,
+			     reco_master, dead_node, ret);
+			skip_all_done = 1;
+			break;
+		}
 	}
 
 	/* move the resources back to the list */
@@ -779,10 +937,15 @@ static void dlm_request_all_locks_worker(struct dlm_work_item *item, void *data)
 	list_splice_init(&resources, &dlm->reco.resources);
 	spin_unlock(&dlm->spinlock);
 
-	ret = dlm_send_all_done_msg(dlm, dead_node, reco_master);
-	if (ret < 0)
-		mlog_errno(ret);
-
+	if (!skip_all_done) {
+		ret = dlm_send_all_done_msg(dlm, dead_node, reco_master);
+		if (ret < 0) {
+			mlog(ML_ERROR, "%s: node %u went down while sending "
+			     "recovery all-done for dead node %u, ret=%d\n",
+			     dlm->name, reco_master, dead_node, ret);
+		}
+	}
+leave:
 	free_page((unsigned long)data);
 }
 
@@ -801,8 +964,14 @@ static int dlm_send_all_done_msg(struct dlm_ctxt *dlm, u8 dead_node, u8 send_to)
 
 	ret = o2net_send_message(DLM_RECO_DATA_DONE_MSG, dlm->key, &done_msg,
 				 sizeof(done_msg), send_to, &tmpret);
-	/* negative status is ignored by the caller */
-	if (ret >= 0)
+	if (ret < 0) {
+		if (!dlm_is_host_down(ret)) {
+			mlog_errno(ret);
+			mlog(ML_ERROR, "%s: unknown error sending data-done "
+			     "to %u\n", dlm->name, send_to);
+			BUG();
+		}
+	} else
 		ret = tmpret;
 	return ret;
 }
@@ -822,7 +991,11 @@ int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data)
 	mlog(0, "got DATA DONE: dead_node=%u, reco.dead_node=%u, "
 	     "node_idx=%u, this node=%u\n", done->dead_node,
 	     dlm->reco.dead_node, done->node_idx, dlm->node_num);
-	BUG_ON(done->dead_node != dlm->reco.dead_node);
+
+	mlog_bug_on_msg((done->dead_node != dlm->reco.dead_node),
+			"Got DATA DONE: dead_node=%u, reco.dead_node=%u, "
+			"node_idx=%u, this node=%u\n", done->dead_node,
+			dlm->reco.dead_node, done->node_idx, dlm->node_num);
 
 	spin_lock(&dlm_reco_state_lock);
 	list_for_each(iter, &dlm->reco.node_data) {
@@ -905,13 +1078,11 @@ static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm,
 			mlog(0, "found lockres owned by dead node while "
 				  "doing recovery for node %u. sending it.\n",
 				  dead_node);
-			list_del_init(&res->recovering);
-			list_add_tail(&res->recovering, list);
+			list_move_tail(&res->recovering, list);
 		} else if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
 			mlog(0, "found UNKNOWN owner while doing recovery "
 				  "for node %u. sending it.\n", dead_node);
-			list_del_init(&res->recovering);
-			list_add_tail(&res->recovering, list);
+			list_move_tail(&res->recovering, list);
 		}
 	}
 	spin_unlock(&dlm->spinlock);
@@ -1023,8 +1194,9 @@ static int dlm_add_lock_to_array(struct dlm_lock *lock,
 		    ml->type == LKM_PRMODE) {
 			/* if it is already set, this had better be a PR
 			 * and it has to match */
-			if (mres->lvb[0] && (ml->type == LKM_EXMODE ||
-			    memcmp(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN))) {
+			if (!dlm_lvb_is_empty(mres->lvb) &&
+			    (ml->type == LKM_EXMODE ||
+			     memcmp(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN))) {
 				mlog(ML_ERROR, "mismatched lvbs!\n");
 				__dlm_print_one_lock_resource(lock->lockres);
 				BUG();
@@ -1083,22 +1255,25 @@ int dlm_send_one_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
 			 * we must send it immediately. */
 			ret = dlm_send_mig_lockres_msg(dlm, mres, send_to,
 						       res, total_locks);
-			if (ret < 0) {
-				// TODO
-				mlog(ML_ERROR, "dlm_send_mig_lockres_msg "
-				     "returned %d, TODO\n", ret);
-				BUG();
-			}
+			if (ret < 0)
+				goto error;
 		}
 	}
 	/* flush any remaining locks */
 	ret = dlm_send_mig_lockres_msg(dlm, mres, send_to, res, total_locks);
-	if (ret < 0) {
-		// TODO
-		mlog(ML_ERROR, "dlm_send_mig_lockres_msg returned %d, "
-		     "TODO\n", ret);
+	if (ret < 0)
+		goto error;
+	return ret;
+
+error:
+	mlog(ML_ERROR, "%s: dlm_send_mig_lockres_msg returned %d\n",
+	     dlm->name, ret);
+	if (!dlm_is_host_down(ret))
 		BUG();
-	}
+	mlog(0, "%s: node %u went down while sending %s "
+	     "lockres %.*s\n", dlm->name, send_to,
+	     flags & DLM_MRES_RECOVERY ?  "recovery" : "migration",
+	     res->lockname.len, res->lockname.name);
 	return ret;
 }
 
@@ -1146,8 +1321,8 @@ int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data)
 		mlog(0, "all done flag.  all lockres data received!\n");
 
 	ret = -ENOMEM;
-	buf = kmalloc(be16_to_cpu(msg->data_len), GFP_KERNEL);
-	item = kcalloc(1, sizeof(*item), GFP_KERNEL);
+	buf = kmalloc(be16_to_cpu(msg->data_len), GFP_NOFS);
+	item = kcalloc(1, sizeof(*item), GFP_NOFS);
 	if (!buf || !item)
 		goto leave;
 
@@ -1238,7 +1413,7 @@ int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data)
 	spin_lock(&dlm->work_lock);
 	list_add_tail(&item->list, &dlm->work_list);
 	spin_unlock(&dlm->work_lock);
-	schedule_work(&dlm->dispatched_work);
+	queue_work(dlm->dlm_worker, &dlm->dispatched_work);
 
 leave:
 	dlm_put(dlm);
@@ -1312,8 +1487,9 @@ leave:
 
 
 
-int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
-			       struct dlm_lock_resource *res, u8 *real_master)
+static int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
+				      struct dlm_lock_resource *res,
+				      u8 *real_master)
 {
 	struct dlm_node_iter iter;
 	int nodenum;
@@ -1406,6 +1582,7 @@ int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data)
 	struct dlm_ctxt *dlm = data;
 	struct dlm_master_requery *req = (struct dlm_master_requery *)msg->buf;
 	struct dlm_lock_resource *res = NULL;
+	unsigned int hash;
 	int master = DLM_LOCK_RES_OWNER_UNKNOWN;
 	u32 flags = DLM_ASSERT_MASTER_REQUERY;
 
@@ -1415,8 +1592,10 @@ int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data)
 		return master;
 	}
 
+	hash = dlm_lockid_hash(req->name, req->namelen);
+
 	spin_lock(&dlm->spinlock);
-	res = __dlm_lookup_lockres(dlm, req->name, req->namelen);
+	res = __dlm_lookup_lockres(dlm, req->name, req->namelen, hash);
 	if (res) {
 		spin_lock(&res->spinlock);
 		master = res->owner;
@@ -1483,7 +1662,7 @@ static int dlm_process_recovery_data(struct dlm_ctxt *dlm,
 	struct dlm_lock *newlock = NULL;
 	struct dlm_lockstatus *lksb = NULL;
 	int ret = 0;
-	int i;
+	int i, bad;
 	struct list_head *iter;
 	struct dlm_lock *lock = NULL;
 
@@ -1529,8 +1708,7 @@ static int dlm_process_recovery_data(struct dlm_ctxt *dlm,
 
 			/* move the lock to its proper place */
 			/* do not alter lock refcount.  switching lists. */
-			list_del_init(&lock->list);
-			list_add_tail(&lock->list, queue);
+			list_move_tail(&lock->list, queue);
 			spin_unlock(&res->spinlock);
 
 			mlog(0, "just reordered a local lock!\n");
@@ -1553,28 +1731,48 @@ static int dlm_process_recovery_data(struct dlm_ctxt *dlm,
 		}
 		lksb->flags |= (ml->flags &
 				(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB));
-			
-		if (mres->lvb[0]) {
+
+		if (ml->type == LKM_NLMODE)
+			goto skip_lvb;
+
+		if (!dlm_lvb_is_empty(mres->lvb)) {
 			if (lksb->flags & DLM_LKSB_PUT_LVB) {
 				/* other node was trying to update
 				 * lvb when node died.  recreate the
 				 * lksb with the updated lvb. */
 				memcpy(lksb->lvb, mres->lvb, DLM_LVB_LEN);
+				/* the lock resource lvb update must happen
+				 * NOW, before the spinlock is dropped.
+				 * we no longer wait for the AST to update
+				 * the lvb. */
+				memcpy(res->lvb, mres->lvb, DLM_LVB_LEN);
 			} else {
 				/* otherwise, the node is sending its 
 				 * most recent valid lvb info */
 				BUG_ON(ml->type != LKM_EXMODE &&
 				       ml->type != LKM_PRMODE);
-				if (res->lvb[0] && (ml->type == LKM_EXMODE ||
-				    memcmp(res->lvb, mres->lvb, DLM_LVB_LEN))) {
-					mlog(ML_ERROR, "received bad lvb!\n");
-					__dlm_print_one_lock_resource(res);
-					BUG();
+				if (!dlm_lvb_is_empty(res->lvb) &&
+ 				    (ml->type == LKM_EXMODE ||
+ 				     memcmp(res->lvb, mres->lvb, DLM_LVB_LEN))) {
+ 					int i;
+ 					mlog(ML_ERROR, "%s:%.*s: received bad "
+ 					     "lvb! type=%d\n", dlm->name,
+ 					     res->lockname.len,
+ 					     res->lockname.name, ml->type);
+ 					printk("lockres lvb=[");
+ 					for (i=0; i<DLM_LVB_LEN; i++)
+ 						printk("%02x", res->lvb[i]);
+ 					printk("]\nmigrated lvb=[");
+ 					for (i=0; i<DLM_LVB_LEN; i++)
+ 						printk("%02x", mres->lvb[i]);
+ 					printk("]\n");
+ 					dlm_print_one_lock_resource(res);
+ 					BUG();
 				}
 				memcpy(res->lvb, mres->lvb, DLM_LVB_LEN);
 			}
 		}
-
+skip_lvb:
 
 		/* NOTE:
 		 * wrt lock queue ordering and recovery:
@@ -1592,9 +1790,33 @@ static int dlm_process_recovery_data(struct dlm_ctxt *dlm,
 		 * relative to each other, but clearly *not*
 		 * preserved relative to locks from other nodes.
 		 */
+		bad = 0;
 		spin_lock(&res->spinlock);
-		dlm_lock_get(newlock);
-		list_add_tail(&newlock->list, queue);
+		list_for_each_entry(lock, queue, list) {
+			if (lock->ml.cookie == ml->cookie) {
+				u64 c = lock->ml.cookie;
+				mlog(ML_ERROR, "%s:%.*s: %u:%llu: lock already "
+				     "exists on this lockres!\n", dlm->name,
+				     res->lockname.len, res->lockname.name,
+				     dlm_get_lock_cookie_node(c),
+				     dlm_get_lock_cookie_seq(c));
+
+				mlog(ML_NOTICE, "sent lock: type=%d, conv=%d, "
+				     "node=%u, cookie=%u:%llu, queue=%d\n",
+	      			     ml->type, ml->convert_type, ml->node,
+				     dlm_get_lock_cookie_node(ml->cookie),
+				     dlm_get_lock_cookie_seq(ml->cookie),
+				     ml->list);
+
+				__dlm_print_one_lock_resource(res);
+				bad = 1;
+				break;
+			}
+		}
+		if (!bad) {
+			dlm_lock_get(newlock);
+			list_add_tail(&newlock->list, queue);
+		}
 		spin_unlock(&res->spinlock);
 	}
 	mlog(0, "done running all the locks\n");
@@ -1618,8 +1840,14 @@ void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
 	struct dlm_lock *lock;
 
 	res->state |= DLM_LOCK_RES_RECOVERING;
-	if (!list_empty(&res->recovering))
+	if (!list_empty(&res->recovering)) {
+		mlog(0,
+		     "Recovering res %s:%.*s, is already on recovery list!\n",
+		     dlm->name, res->lockname.len, res->lockname.name);
 		list_del_init(&res->recovering);
+	}
+	/* We need to hold a reference while on the recovery list */
+	dlm_lockres_get(res);
 	list_add_tail(&res->recovering, &dlm->reco.resources);
 
 	/* find any pending locks and put them back on proper list */
@@ -1708,9 +1936,11 @@ static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
 			spin_lock(&res->spinlock);
 			dlm_change_lockres_owner(dlm, res, new_master);
 			res->state &= ~DLM_LOCK_RES_RECOVERING;
-			__dlm_dirty_lockres(dlm, res);
+			if (!__dlm_lockres_unused(res))
+				__dlm_dirty_lockres(dlm, res);
 			spin_unlock(&res->spinlock);
 			wake_up(&res->wq);
+			dlm_lockres_put(res);
 		}
 	}
 
@@ -1719,7 +1949,7 @@ static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
 	 * the RECOVERING state and set the owner
 	 * if necessary */
 	for (i = 0; i < DLM_HASH_BUCKETS; i++) {
-		bucket = &(dlm->lockres_hash[i]);
+		bucket = dlm_lockres_hash(dlm, i);
 		hlist_for_each_entry(res, hash_iter, bucket, hash_node) {
 			if (res->state & DLM_LOCK_RES_RECOVERING) {
 				if (res->owner == dead_node) {
@@ -1743,11 +1973,13 @@ static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
 					     dlm->name, res->lockname.len,
 					     res->lockname.name, res->owner);
 					list_del_init(&res->recovering);
+					dlm_lockres_put(res);
 				}
 				spin_lock(&res->spinlock);
 				dlm_change_lockres_owner(dlm, res, new_master);
 				res->state &= ~DLM_LOCK_RES_RECOVERING;
-				__dlm_dirty_lockres(dlm, res);
+				if (!__dlm_lockres_unused(res))
+					__dlm_dirty_lockres(dlm, res);
 				spin_unlock(&res->spinlock);
 				wake_up(&res->wq);
 			}
@@ -1884,7 +2116,7 @@ static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node)
 	 *    need to be fired as a result.
 	 */
 	for (i = 0; i < DLM_HASH_BUCKETS; i++) {
-		bucket = &(dlm->lockres_hash[i]);
+		bucket = dlm_lockres_hash(dlm, i);
 		hlist_for_each_entry(res, iter, bucket, hash_node) {
  			/* always prune any $RECOVERY entries for dead nodes,
  			 * otherwise hangs can occur during later recovery */
@@ -1924,6 +2156,20 @@ static void __dlm_hb_node_down(struct dlm_ctxt *dlm, int idx)
 {
 	assert_spin_locked(&dlm->spinlock);
 
+	if (dlm->reco.new_master == idx) {
+		mlog(0, "%s: recovery master %d just died\n",
+		     dlm->name, idx);
+		if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) {
+			/* finalize1 was reached, so it is safe to clear
+			 * the new_master and dead_node.  that recovery
+			 * is complete. */
+			mlog(0, "%s: dead master %d had reached "
+			     "finalize1 state, clearing\n", dlm->name, idx);
+			dlm->reco.state &= ~DLM_RECO_STATE_FINALIZE;
+			__dlm_reset_recovery(dlm);
+		}
+	}
+
 	/* check to see if the node is already considered dead */
 	if (!test_bit(idx, dlm->live_nodes_map)) {
 		mlog(0, "for domain %s, node %d is already dead. "
@@ -2087,7 +2333,7 @@ again:
 
 			/* set the new_master to this node */
 			spin_lock(&dlm->spinlock);
-			dlm->reco.new_master = dlm->node_num;
+			dlm_set_reco_master(dlm, dlm->node_num);
 			spin_unlock(&dlm->spinlock);
 		}
 
@@ -2125,6 +2371,10 @@ again:
 		mlog(0, "%s: reco master %u is ready to recover %u\n",
 		     dlm->name, dlm->reco.new_master, dlm->reco.dead_node);
 		status = -EEXIST;
+	} else if (ret == DLM_RECOVERING) {
+		mlog(0, "dlm=%s dlmlock says master node died (this=%u)\n",
+		     dlm->name, dlm->node_num);
+		goto again;
 	} else {
 		struct dlm_lock_resource *res;
 
@@ -2156,7 +2406,7 @@ static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node)
 
 	mlog_entry("%u\n", dead_node);
 
-	mlog(0, "dead node is %u\n", dead_node);
+	mlog(0, "%s: dead node is %u\n", dlm->name, dead_node);
 
 	spin_lock(&dlm->spinlock);
 	dlm_node_iter_init(dlm->domain_map, &iter);
@@ -2214,6 +2464,14 @@ retry:
 			 * another ENOMEM */
 			msleep(100);
 			goto retry;
+		} else if (ret == EAGAIN) {
+			mlog(0, "%s: trying to start recovery of node "
+			     "%u, but node %u is waiting for last recovery "
+			     "to complete, backoff for a bit\n", dlm->name,
+			     dead_node, nodenum);
+			/* TODO Look into replacing msleep with cond_resched() */
+			msleep(100);
+			goto retry;
 		}
 	}
 
@@ -2229,8 +2487,20 @@ int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data)
 	if (!dlm_grab(dlm))
 		return 0;
 
-	mlog(0, "node %u wants to recover node %u\n",
-		  br->node_idx, br->dead_node);
+	spin_lock(&dlm->spinlock);
+	if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) {
+		mlog(0, "%s: node %u wants to recover node %u (%u:%u) "
+		     "but this node is in finalize state, waiting on finalize2\n",
+		     dlm->name, br->node_idx, br->dead_node,
+		     dlm->reco.dead_node, dlm->reco.new_master);
+		spin_unlock(&dlm->spinlock);
+		return EAGAIN;
+	}
+	spin_unlock(&dlm->spinlock);
+
+	mlog(0, "%s: node %u wants to recover node %u (%u:%u)\n",
+	     dlm->name, br->node_idx, br->dead_node,
+	     dlm->reco.dead_node, dlm->reco.new_master);
 
 	dlm_fire_domain_eviction_callbacks(dlm, br->dead_node);
 
@@ -2252,8 +2522,8 @@ int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data)
 		     "node %u changing it to %u\n", dlm->name, 
 		     dlm->reco.dead_node, br->node_idx, br->dead_node);
 	}
-	dlm->reco.new_master = br->node_idx;
-	dlm->reco.dead_node = br->dead_node;
+	dlm_set_reco_master(dlm, br->node_idx);
+	dlm_set_reco_dead_node(dlm, br->dead_node);
 	if (!test_bit(br->dead_node, dlm->recovery_map)) {
 		mlog(0, "recovery master %u sees %u as dead, but this "
 		     "node has not yet.  marking %u as dead\n",
@@ -2272,10 +2542,16 @@ int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data)
 	spin_unlock(&dlm->spinlock);
 
 	dlm_kick_recovery_thread(dlm);
+
+	mlog(0, "%s: recovery started by node %u, for %u (%u:%u)\n",
+	     dlm->name, br->node_idx, br->dead_node,
+	     dlm->reco.dead_node, dlm->reco.new_master);
+
 	dlm_put(dlm);
 	return 0;
 }
 
+#define DLM_FINALIZE_STAGE2  0x01
 static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm)
 {
 	int ret = 0;
@@ -2283,25 +2559,31 @@ static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm)
 	struct dlm_node_iter iter;
 	int nodenum;
 	int status;
+	int stage = 1;
 
-	mlog(0, "finishing recovery for node %s:%u\n",
-	     dlm->name, dlm->reco.dead_node);
+	mlog(0, "finishing recovery for node %s:%u, "
+	     "stage %d\n", dlm->name, dlm->reco.dead_node, stage);
 
 	spin_lock(&dlm->spinlock);
 	dlm_node_iter_init(dlm->domain_map, &iter);
 	spin_unlock(&dlm->spinlock);
 
+stage2:
 	memset(&fr, 0, sizeof(fr));
 	fr.node_idx = dlm->node_num;
 	fr.dead_node = dlm->reco.dead_node;
+	if (stage == 2)
+		fr.flags |= DLM_FINALIZE_STAGE2;
 
 	while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
 		if (nodenum == dlm->node_num)
 			continue;
 		ret = o2net_send_message(DLM_FINALIZE_RECO_MSG, dlm->key,
 					 &fr, sizeof(fr), nodenum, &status);
-		if (ret >= 0) {
+		if (ret >= 0)
 			ret = status;
+		if (ret < 0) {
+			mlog_errno(ret);
 			if (dlm_is_host_down(ret)) {
 				/* this has no effect on this recovery 
 				 * session, so set the status to zero to 
@@ -2309,13 +2591,17 @@ static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm)
 				mlog(ML_ERROR, "node %u went down after this "
 				     "node finished recovery.\n", nodenum);
 				ret = 0;
+				continue;
 			}
-		}
-		if (ret < 0) {
-			mlog_errno(ret);
 			break;
 		}
 	}
+	if (stage == 1) {
+		/* reset the node_iter back to the top and send finalize2 */
+		iter.curnode = -1;
+		stage = 2;
+		goto stage2;
+	}
 
 	return ret;
 }
@@ -2324,14 +2610,19 @@ int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data)
 {
 	struct dlm_ctxt *dlm = data;
 	struct dlm_finalize_reco *fr = (struct dlm_finalize_reco *)msg->buf;
+	int stage = 1;
 
 	/* ok to return 0, domain has gone away */
 	if (!dlm_grab(dlm))
 		return 0;
 
-	mlog(0, "node %u finalizing recovery of node %u\n",
-	     fr->node_idx, fr->dead_node);
+	if (fr->flags & DLM_FINALIZE_STAGE2)
+		stage = 2;
 
+	mlog(0, "%s: node %u finalizing recovery stage%d of "
+	     "node %u (%u:%u)\n", dlm->name, fr->node_idx, stage,
+	     fr->dead_node, dlm->reco.dead_node, dlm->reco.new_master);
+ 
 	spin_lock(&dlm->spinlock);
 
 	if (dlm->reco.new_master != fr->node_idx) {
@@ -2347,13 +2638,41 @@ int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data)
 		BUG();
 	}
 
-	dlm_finish_local_lockres_recovery(dlm, fr->dead_node, fr->node_idx);
-
-	spin_unlock(&dlm->spinlock);
+	switch (stage) {
+		case 1:
+			dlm_finish_local_lockres_recovery(dlm, fr->dead_node, fr->node_idx);
+			if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) {
+				mlog(ML_ERROR, "%s: received finalize1 from "
+				     "new master %u for dead node %u, but "
+				     "this node has already received it!\n",
+				     dlm->name, fr->node_idx, fr->dead_node);
+				dlm_print_reco_node_status(dlm);
+				BUG();
+			}
+			dlm->reco.state |= DLM_RECO_STATE_FINALIZE;
+			spin_unlock(&dlm->spinlock);
+			break;
+		case 2:
+			if (!(dlm->reco.state & DLM_RECO_STATE_FINALIZE)) {
+				mlog(ML_ERROR, "%s: received finalize2 from "
+				     "new master %u for dead node %u, but "
+				     "this node did not have finalize1!\n",
+				     dlm->name, fr->node_idx, fr->dead_node);
+				dlm_print_reco_node_status(dlm);
+				BUG();
+			}
+			dlm->reco.state &= ~DLM_RECO_STATE_FINALIZE;
+			spin_unlock(&dlm->spinlock);
+			dlm_reset_recovery(dlm);
+			dlm_kick_recovery_thread(dlm);
+			break;
+		default:
+			BUG();
+	}
 
-	dlm_reset_recovery(dlm);
+	mlog(0, "%s: recovery done, reco master was %u, dead now %u, master now %u\n",
+	     dlm->name, fr->node_idx, dlm->reco.dead_node, dlm->reco.new_master);
 
-	dlm_kick_recovery_thread(dlm);
 	dlm_put(dlm);
 	return 0;
 }