Add trace! for spawn of a handler

olivefs/src/filesystem.rs

@@ -4,7 +4,7 @@ use fuser::{
     ReplyOpen, ReplyStatfs, ReplyWrite, ReplyXattr, Request, TimeOrNow,
 };
 use libc::{ENOSYS, EPERM, O_APPEND, O_RDONLY, O_RDWR, O_WRONLY};
-use log::{debug, error, warn};
+use log::{debug, error, trace, warn};
 use std::collections::HashMap;
 use std::ffi::OsStr;
 use std::future::Future;
@@ -1359,6 +1359,7 @@ impl OliveFilesystem {
     where
         Fut: Future<Output = anyhow::Result<()>> + Send + 'static,
     {
+        trace!("spawn: {:?}", name);
         self.tokio_runtime.spawn(async move {
             if let Err(error) = future.await {
                 error!("Error in {}: {:?}", name, error);