fio: document locking for overlap checking in offload mode

[fio.git] / ioengines.c

diff --git a/ioengines.c b/ioengines.c
index 56723addc5af2f57348d2b3784c4594a5c8e88b1..b7df860825e55bb433b20a981f45c2ebf6439734 100644 (file)
--- a/ioengines.c
+++ b/ioengines.c
@@ -288,6 +288,13 @@ 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 overlap checking was enabled in offload mode we
+        * can release this lock that was acquired when we
+        * started the overlap check because the IO_U_F_FLIGHT
+        * flag is now set
+        */
        if (td_offload_overlap(td))
                pthread_mutex_unlock(&overlap_check);