job: Convert block_job_cancel_async() to Job

block_job_cancel_async() did two things that were still block job
specific:

* Setting job->force. This field makes sense on the Job level, so we can
  just move it. While at it, rename it to job->force_cancel to make its
  purpose more obvious.

* Resetting the I/O status. This can't be moved because generic Jobs
  don't have an I/O status. What the function really implements is a
  user resume, except without entering the coroutine. Consequently, it
  makes sense to call the .user_resume driver callback here which
  already resets the I/O status.

  The old block_job_cancel_async() has two separate if statements that
  check job->iostatus != BLOCK_DEVICE_IO_STATUS_OK and job->user_paused.
  However, the former condition always implies the latter (as is
  asserted in block_job_iostatus_reset()), so changing the explicit call
  of block_job_iostatus_reset() on the former condition with the
  .user_resume callback on the latter condition is equivalent and
  doesn't need to access any BlockJob specific state.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/block/mirror.c b/block/mirror.c
index e9a90ea..c3951d1 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -871,7 +871,7 @@ static void coroutine_fn mirror_run(void *opaque)
         trace_mirror_before_sleep(s, cnt, s->synced, delay_ns);
         job_sleep_ns(&s->common.job, delay_ns);
         if (job_is_cancelled(&s->common.job) &&
-            (!s->synced || s->common.force))
+            (!s->synced || s->common.job.force_cancel))
         {
             break;
         }
@@ -884,7 +884,7 @@ immediate_exit:
          * or it was cancelled prematurely so that we do not guarantee that
          * the target is a copy of the source.
          */
-        assert(ret < 0 || ((s->common.force || !s->synced) &&
+        assert(ret < 0 || ((s->common.job.force_cancel || !s->synced) &&
                job_is_cancelled(&s->common.job)));
         assert(need_drain);
         mirror_wait_for_all_io(s);