kernel: add openat logging to trace bootstrap syscalls

src/syscall/fs.rs

@@ -77,11 +77,16 @@ pub fn openat(
         let current_lock = context::current();
         let mut current = current_lock.read(token.token());
         let (context, mut token) = current.token_split();
-        let pipe = context.get_file(fh, &mut token).ok_or(Error::new(EBADF))?;
+        let pipe = context.get_file(fh, &mut token).ok_or_else(|| {
+            info!("openat: EBADF fh={:#x}", fh.get());
+            Error::new(EBADF)
+        })?;
         let desc = pipe.description.read(token.token());
         (desc.scheme, desc.number)
     };
 
+    info!("openat: fh={:#x} scheme_id={} number={} path='{}'", fh.get(), scheme_id.get(), number, path_buf);
+
     let caller_ctx = context::current()
         .read(token.token())
         .caller_ctx()