Orangefs: Don't wait the old-fashioned way.

Get rid of add_wait_queue, set_current_state, etc, and use the
wait_event() model.
Signed-off-by: Mike Marshall <hubcap@omnibond.com>

fs/orangefs/devorangefs-req.c

@@ -432,7 +432,6 @@ static ssize_t orangefs_devreq_writev(struct file *file,
 				return -EIO;
 			}
 		} else {
-			/* Change downcall status */
 			gossip_err("writev: could not vmalloc for trailer!\n");
 			dev_req_release(buffer);
 			put_op(op);
@@ -453,7 +452,7 @@ static ssize_t orangefs_devreq_writev(struct file *file,
 		 */
 		if (op->upcall.type == ORANGEFS_VFS_OP_FILE_IO) {
 			int timed_out = 0;
-			DECLARE_WAITQUEUE(wait_entry, current);
+			DEFINE_WAIT(wait_entry);
 
 			/*
 			 * tell the vfs op waiting on a waitqueue
@@ -463,14 +462,14 @@ static ssize_t orangefs_devreq_writev(struct file *file,
 			set_op_state_serviced(op);
 			spin_unlock(&op->lock);
 
-			add_wait_queue_exclusive(&op->io_completion_waitq,
-						 &wait_entry);
 			wake_up_interruptible(&op->waitq);
 
 			while (1) {
-				set_current_state(TASK_INTERRUPTIBLE);
-
 				spin_lock(&op->lock);
+				prepare_to_wait_exclusive(
+					&op->io_completion_waitq,
+					&wait_entry,
+					TASK_INTERRUPTIBLE);
 				if (op->io_completed) {
 					spin_unlock(&op->lock);
 					break;
@@ -497,9 +496,9 @@ static ssize_t orangefs_devreq_writev(struct file *file,
 				break;
 			}
 
-			set_current_state(TASK_RUNNING);
-			remove_wait_queue(&op->io_completion_waitq,
-					  &wait_entry);
+			spin_lock(&op->lock);
+			finish_wait(&op->io_completion_waitq, &wait_entry);
+			spin_unlock(&op->lock);
 
 			/* NOTE: for I/O operations we handle releasing the op
 			 * object except in the case of timeout.  the reason we

fs/orangefs/orangefs-bufmap.c

@@ -333,19 +333,17 @@ static int wait_for_a_slot(struct slot_args *slargs, int *buffer_index)
 {
 	int ret = -1;
 	int i = 0;
-	DECLARE_WAITQUEUE(my_wait, current);
-
-
-	add_wait_queue_exclusive(slargs->slot_wq, &my_wait);
+	DEFINE_WAIT(wait_entry);
 
 	while (1) {
-		set_current_state(TASK_INTERRUPTIBLE);
-
 		/*
 		 * check for available desc, slot_lock is the appropriate
 		 * index_lock
 		 */
 		spin_lock(slargs->slot_lock);
+		prepare_to_wait_exclusive(slargs->slot_wq,
+					  &wait_entry,
+					  TASK_INTERRUPTIBLE);
 		for (i = 0; i < slargs->slot_count; i++)
 			if (slargs->slot_array[i] == 0) {
 				slargs->slot_array[i] = 1;
@@ -383,8 +381,9 @@ static int wait_for_a_slot(struct slot_args *slargs, int *buffer_index)
 		break;
 	}
 
-	set_current_state(TASK_RUNNING);
-	remove_wait_queue(slargs->slot_wq, &my_wait);
+	spin_lock(slargs->slot_lock);
+	finish_wait(slargs->slot_wq, &wait_entry);
+	spin_unlock(slargs->slot_lock);
 	return ret;
 }
 

fs/orangefs/waitqueue.c

@@ -62,7 +62,7 @@ int service_operation(struct orangefs_kernel_op_s *op,
 	/* irqflags and wait_entry are only used IF the client-core aborts */
 	unsigned long irqflags;
 
-	DECLARE_WAITQUEUE(wait_entry, current);
+	DEFINE_WAIT(wait_entry);
 
 	op->upcall.tgid = current->tgid;
 	op->upcall.pid = current->pid;
@@ -204,11 +204,11 @@ int service_operation(struct orangefs_kernel_op_s *op,
 			 * memory system can be initialized.
 			 */
 			spin_lock_irqsave(&op->lock, irqflags);
-			add_wait_queue(&orangefs_bufmap_init_waitq, &wait_entry);
+			prepare_to_wait(&orangefs_bufmap_init_waitq,
+					&wait_entry,
+					TASK_INTERRUPTIBLE);
 			spin_unlock_irqrestore(&op->lock, irqflags);
 
-			set_current_state(TASK_INTERRUPTIBLE);
-
 			/*
 			 * Wait for orangefs_bufmap_initialize() to wake me up
 			 * within the allotted time.
@@ -225,8 +225,7 @@ int service_operation(struct orangefs_kernel_op_s *op,
 				     get_bufmap_init());
 
 			spin_lock_irqsave(&op->lock, irqflags);
-			remove_wait_queue(&orangefs_bufmap_init_waitq,
-					  &wait_entry);
+			finish_wait(&orangefs_bufmap_init_waitq, &wait_entry);
 			spin_unlock_irqrestore(&op->lock, irqflags);
 
 			if (get_bufmap_init() == 0) {
@@ -342,16 +341,11 @@ void orangefs_clean_up_interrupted_operation(struct orangefs_kernel_op_s *op)
 int wait_for_matching_downcall(struct orangefs_kernel_op_s *op)
 {
 	int ret = -EINVAL;
-	DECLARE_WAITQUEUE(wait_entry, current);
-
-	spin_lock(&op->lock);
-	add_wait_queue(&op->waitq, &wait_entry);
-	spin_unlock(&op->lock);
+	DEFINE_WAIT(wait_entry);
 
 	while (1) {
-		set_current_state(TASK_INTERRUPTIBLE);
-
 		spin_lock(&op->lock);
+		prepare_to_wait(&op->waitq, &wait_entry, TASK_INTERRUPTIBLE);
 		if (op_state_serviced(op)) {
 			spin_unlock(&op->lock);
 			ret = 0;
@@ -434,10 +428,8 @@ int wait_for_matching_downcall(struct orangefs_kernel_op_s *op)
 		break;
 	}
 
-	set_current_state(TASK_RUNNING);
-
 	spin_lock(&op->lock);
-	remove_wait_queue(&op->waitq, &wait_entry);
+	finish_wait(&op->waitq, &wait_entry);
 	spin_unlock(&op->lock);
 
 	return ret;
@@ -455,16 +447,11 @@ int wait_for_matching_downcall(struct orangefs_kernel_op_s *op)
 int wait_for_cancellation_downcall(struct orangefs_kernel_op_s *op)
 {
 	int ret = -EINVAL;
-	DECLARE_WAITQUEUE(wait_entry, current);
-
-	spin_lock(&op->lock);
-	add_wait_queue(&op->waitq, &wait_entry);
-	spin_unlock(&op->lock);
+	DEFINE_WAIT(wait_entry);
 
 	while (1) {
-		set_current_state(TASK_INTERRUPTIBLE);
-
 		spin_lock(&op->lock);
+		prepare_to_wait(&op->waitq, &wait_entry, TASK_INTERRUPTIBLE);
 		if (op_state_serviced(op)) {
 			gossip_debug(GOSSIP_WAIT_DEBUG,
 				     "%s:op-state is SERVICED.\n",
@@ -514,10 +501,8 @@ int wait_for_cancellation_downcall(struct orangefs_kernel_op_s *op)
 		break;
 	}
 
-	set_current_state(TASK_RUNNING);
-
 	spin_lock(&op->lock);
-	remove_wait_queue(&op->waitq, &wait_entry);
+	finish_wait(&op->waitq, &wait_entry);
 	spin_unlock(&op->lock);
 
 	gossip_debug(GOSSIP_WAIT_DEBUG,