Disable io_submit_mode=offload with async engines

[fio.git] / ioengines.c

diff --git a/ioengines.c b/ioengines.c
index 476df58da7c1239c6cf8a60546f77a7dcdc56aad..32583d5a802f1d41a3d4dfa109d44dfbaea3f1b9 100644 (file)
--- a/ioengines.c
+++ b/ioengines.c
@@ -22,7 +22,7 @@
 
 static FLIST_HEAD(engine_list);
 
-static bool check_engine_ops(struct ioengine_ops *ops)
+static bool check_engine_ops(struct thread_data *td, struct ioengine_ops *ops)
 {
        if (ops->version != FIO_IOOPS_VERSION) {
                log_err("bad ioops version %d (want %d)\n", ops->version,
@@ -41,6 +41,15 @@ static bool check_engine_ops(struct ioengine_ops *ops)
        if (ops->flags & FIO_SYNCIO)
                return false;
 
+       /*
+        * async engines aren't reliable with offload
+        */
+       if (td->o.io_submit_mode == IO_MODE_OFFLOAD) {
+               log_err("%s: can't be used with offloaded submit. Use a sync "
+                       "engine\n", ops->name);
+               return true;
+       }
+
        if (!ops->event || !ops->getevents) {
                log_err("%s: no event/getevents handler\n", ops->name);
                return true;
@@ -193,7 +202,7 @@ struct ioengine_ops *load_ioengine(struct thread_data *td)
        /*
         * Check that the required methods are there.
         */
-       if (check_engine_ops(ops))
+       if (check_engine_ops(td, ops))
                return NULL;
 
        return ops;