mirror: Stop active mirroring after force-cancel

Once the mirror job is force-cancelled (job_is_cancelled() is true), we
should not generate new I/O requests.  This applies to active mirroring,
too, so stop it once the job is cancelled.

(We must still forward all I/O requests to the source, though, of
course, but those are not really I/O requests generated by the job, so
this is fine.)

Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20211006151940.214590-12-hreitz@redhat.com>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

block/mirror.c

@@ -1425,6 +1425,7 @@ static int coroutine_fn bdrv_mirror_top_do_write(BlockDriverState *bs,
     bool copy_to_target;
 
     copy_to_target = s->job->ret >= 0 &&
+                     !job_is_cancelled(&s->job->common.job) &&
                      s->job->copy_mode == MIRROR_COPY_MODE_WRITE_BLOCKING;
 
     if (copy_to_target) {
@@ -1473,6 +1474,7 @@ static int coroutine_fn bdrv_mirror_top_pwritev(BlockDriverState *bs,
     bool copy_to_target;
 
     copy_to_target = s->job->ret >= 0 &&
+                     !job_is_cancelled(&s->job->common.job) &&
                      s->job->copy_mode == MIRROR_COPY_MODE_WRITE_BLOCKING;
 
     if (copy_to_target) {