splice: add wakeup_pipe_readers()

Add and use wakeup_pipe_readers() to consolidate duplicated codes.
Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

fs/splice.c

@@ -162,6 +162,14 @@ static const struct pipe_buf_operations user_page_pipe_buf_ops = {
 	.get = generic_pipe_buf_get,
 };
 
+static void wakeup_pipe_readers(struct pipe_inode_info *pipe)
+{
+	smp_mb();
+	if (waitqueue_active(&pipe->wait))
+		wake_up_interruptible(&pipe->wait);
+	kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
+}
+
 /**
  * splice_to_pipe - fill passed data into a pipe
  * @pipe:	pipe to fill
@@ -247,12 +255,8 @@ ssize_t splice_to_pipe(struct pipe_inode_info *pipe,
 
 	pipe_unlock(pipe);
 
-	if (do_wakeup) {
-		smp_mb();
-		if (waitqueue_active(&pipe->wait))
-			wake_up_interruptible(&pipe->wait);
-		kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
-	}
+	if (do_wakeup)
+		wakeup_pipe_readers(pipe);
 
 	while (page_nr < spd_pages)
 		spd->spd_release(spd, page_nr++);
@@ -1892,12 +1896,9 @@ static int splice_pipe_to_pipe(struct pipe_inode_info *ipipe,
 	/*
 	 * If we put data in the output pipe, wakeup any potential readers.
 	 */
-	if (ret > 0) {
-		smp_mb();
-		if (waitqueue_active(&opipe->wait))
-			wake_up_interruptible(&opipe->wait);
-		kill_fasync(&opipe->fasync_readers, SIGIO, POLL_IN);
-	}
+	if (ret > 0)
+		wakeup_pipe_readers(opipe);
+
 	if (input_wakeup)
 		wakeup_pipe_writers(ipipe);
 
@@ -1976,12 +1977,8 @@ static int link_pipe(struct pipe_inode_info *ipipe,
 	/*
 	 * If we put data in the output pipe, wakeup any potential readers.
 	 */
-	if (ret > 0) {
-		smp_mb();
-		if (waitqueue_active(&opipe->wait))
-			wake_up_interruptible(&opipe->wait);
-		kill_fasync(&opipe->fasync_readers, SIGIO, POLL_IN);
-	}
+	if (ret > 0)
+		wakeup_pipe_readers(opipe);
 
 	return ret;
 }