Add named log level

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/log.h b/log.h
index 2b2cae0..ad9d08b 100644
--- a/log.h
+++ b/log.h
@@ -17,6 +17,9 @@
 	FIO_LOG_DEBUG	= 1,
 	FIO_LOG_INFO	= 2,
 	FIO_LOG_ERR	= 3,
+	FIO_LOG_NR	= 4,
 };
 
+extern const char *log_get_level(int level);
+
 #endif