Added a LogF method to Op.

fuseops/ops.go

@@ -38,6 +38,11 @@ type Op interface {
 	// Repond to the operation with the supplied error. If there is no error, set
 	// any necessary output fields and then call Respond(nil).
 	Respond(error)
+
+	// Log information tied to this operation, with semantics equivalent to
+	// log.Printf, except that the format is different and logging is suppressed
+	// if --fuse.debug is not set.
+	Logf(format string, v ...interface{})
 }
 
 ////////////////////////////////////////////////////////////////////////