[PATCH for-6.1? v2 6/7] mirror: Check job_is_cancelled() earlier

[Max Reitz <mreitz@redhat.com>]

We must check whether the job is force-cancelled early in our main loop,
most importantly before any `continue` statement.  For example, we used
to have `continue`s before our current checking location that are
triggered by `mirror_flush()` failing.  So, if `mirror_flush()` kept
failing, force-cancelling the job would not terminate it.

A job being force-cancelled should be treated the same as the job having
failed, so put the check in the same place where we check `s->ret < 0`.

Buglink: https://gitlab.com/qemu-project/qemu/-/issues/462
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/mirror.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/block/mirror.c b/block/mirror.c
index 72e02fa34e..46d1a1e5a2 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -993,7 +993,7 @@ static int coroutine_fn mirror_run(Job *job, Error **errp)
             mirror_wait_for_any_operation(s, true);
         }
 
-        if (s->ret < 0) {
+        if (s->ret < 0 || job_is_cancelled(&s->common.job)) {
             ret = s->ret;
             goto immediate_exit;
         }
@@ -1078,8 +1078,6 @@ static int coroutine_fn mirror_run(Job *job, Error **errp)
             break;
         }
 
-        ret = 0;
-
         if (job_is_ready(&s->common.job) && !should_complete) {
             delay_ns = (s->in_flight == 0 &&
                         cnt == 0 ? BLOCK_JOB_SLICE_TIME : 0);
@@ -1087,9 +1085,6 @@ static int coroutine_fn mirror_run(Job *job, Error **errp)
         trace_mirror_before_sleep(s, cnt, job_is_ready(&s->common.job),
                                   delay_ns);
         job_sleep_ns(&s->common.job, delay_ns);
-        if (job_is_cancelled(&s->common.job)) {
-            break;
-        }
         s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
     }
 
-- 
2.31.1