[Qemu-block] [PATCH for-2.9] mirror: Fix backwards mirror_yield parameters

[Eric Blake]

trace-events lists the parameters for mirror_yield consistently
with other events (cnt just after s, like in mirror_before_sleep;
in_flight last, like in mirror_yield_in_flight).  But the callers
were passing parameters in the wrong order, leading to poor trace
messages, including type truncation when there are more than 4G
dirty sectors involved.

Signed-off-by: Eric Blake <address@hidden>
---
 block/mirror.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/mirror.c b/block/mirror.c
index 4f3a5cb..1c403c5 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -633,7 +633,7 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
             }

             if (s->in_flight >= MAX_IN_FLIGHT) {
-                trace_mirror_yield(s, s->in_flight, s->buf_free_count, -1);
+                trace_mirror_yield(s, -1, s->buf_free_count, s->in_flight);
                 mirror_wait_for_io(s);
                 continue;
             }
@@ -808,7 +808,7 @@ static void coroutine_fn mirror_run(void *opaque)
             s->common.iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
             if (s->in_flight >= MAX_IN_FLIGHT || s->buf_free_count == 0 ||
                 (cnt == 0 && s->in_flight > 0)) {
-                trace_mirror_yield(s, s->in_flight, s->buf_free_count, cnt);
+                trace_mirror_yield(s, cnt, s->buf_free_count, s->in_flight);
                 mirror_wait_for_io(s);
                 continue;
             } else if (cnt != 0) {
-- 
2.9.3