fio: add function to check for serialize_overlap with offload submission

In multiple places fio needs to check whether it is carrying out overlap
checking in offload submission mode. Make this check a function to
improve code readability.

Reviewed-by: Sebastien Boisvert <sboisvert@gydle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: vincentkfu

backend.c

@@ -1874,10 +1874,10 @@ static void *thread_main(void *data)
 			 "perhaps try --debug=io option for details?\n",
 			 td->o.name, td->io_ops->name);
 
-	if (td->o.serialize_overlap && td->o.io_submit_mode == IO_MODE_OFFLOAD)
+	if (td_offload_overlap(td))
 		pthread_mutex_lock(&overlap_check);
 	td_set_runstate(td, TD_FINISHING);
-	if (td->o.serialize_overlap && td->o.io_submit_mode == IO_MODE_OFFLOAD)
+	if (td_offload_overlap(td))
 		pthread_mutex_unlock(&overlap_check);
 
 	update_rusage_stat(td);

fio.h

@@ -772,6 +772,11 @@ static inline bool td_async_processing(struct thread_data *td)
 	return (td->flags & TD_F_NEED_LOCK) != 0;
 }
 
+static inline bool td_offload_overlap(struct thread_data *td)
+{
+	return td->o.serialize_overlap && td->o.io_submit_mode == IO_MODE_OFFLOAD;
+}
+
 /*
  * We currently only need to do locking if we have verifier threads
  * accessing our internal structures too

ioengines.c

@@ -288,7 +288,7 @@ enum fio_q_status td_io_queue(struct thread_data *td, struct io_u *io_u)
 
 	assert((io_u->flags & IO_U_F_FLIGHT) == 0);
 	io_u_set(td, io_u, IO_U_F_FLIGHT);
-	if (td->o.serialize_overlap && td->o.io_submit_mode == IO_MODE_OFFLOAD)
+	if (td_offload_overlap(td))
 		pthread_mutex_unlock(&overlap_check);
 
 	assert(fio_file_open(io_u->file));