backend: fix a case where we complain about no IO being done

If we're just doing a read phase verify, then we clear
bytes_done before we can check it at the end. Ensure that we
always notice if we did IO, so we don't spew this warning:

job_0: No I/O performed by libaio, perhaps try --debug=io option for details?

when we actually did do exactly what we had to.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/backend.c b/backend.c
index 6198c3d9f8c7d445713c6a70fcd91b0f1ff03807..e4eff378dfd4c736cdcf20436124ac147db4afdf 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -1505,7 +1505,7 @@ static void *thread_main(void *data)
        struct sk_out *sk_out = fd->sk_out;
        uint64_t bytes_done[DDIR_RWDIR_CNT];
        int deadlock_loop_cnt;
-       int clear_state;
+       bool clear_state, did_some_io;
        int ret;
 
        sk_out_assign(sk_out);
@@ -1726,7 +1726,8 @@ static void *thread_main(void *data)
        }
 
        memset(bytes_done, 0, sizeof(bytes_done));
-       clear_state = 0;
+       clear_state = false;
+       did_some_io = false;
 
        while (keep_running(td)) {
                uint64_t verify_bytes;
@@ -1765,7 +1766,7 @@ static void *thread_main(void *data)
                if (td->runstate >= TD_EXITED)
                        break;
 
-               clear_state = 1;
+               clear_state = true;
 
                /*
                 * Make sure we've successfully updated the rusage stats
@@ -1804,6 +1805,9 @@ static void *thread_main(void *data)
                    td_ioengine_flagged(td, FIO_UNIDIR))
                        continue;
 
+               if (ddir_rw_sum(bytes_done))
+                       did_some_io = true;
+
                clear_io_state(td, 0);
 
                fio_gettime(&td->start, NULL);
@@ -1830,6 +1834,7 @@ static void *thread_main(void *data)
         * (Are we not missing other flags that can be ignored ?)
         */
        if ((td->o.size || td->o.io_size) && !ddir_rw_sum(bytes_done) &&
+           !did_some_io &&
            !(td_ioengine_flagged(td, FIO_NOIO) ||
              td_ioengine_flagged(td, FIO_DISKLESSIO)))
                log_err("%s: No I/O performed by %s, "