job: Add job_drain()

block_job_drain() contains a blk_drain() call which cannot be moved to
Job, so add a new JobDriver callback JobDriver.drain which has a common
implementation for all BlockJobs. In addition to this we keep the
existing BlockJobDriver.drain callback that is called by the common
drain implementation for all block jobs.

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

1 files changed, 11 insertions, 0 deletions

diff --git a/job.c b/job.c
index 64b64da..3772a35 100644
--- a/job.c
+++ b/job.c
@@ -367,6 +367,17 @@ void coroutine_fn job_sleep_ns(Job *job, int64_t ns)
     job_pause_point(job);
 }
 
+void job_drain(Job *job)
+{
+    /* If job is !busy this kicks it into the next pause point. */
+    job_enter(job);
+
+    if (job->driver->drain) {
+        job->driver->drain(job);
+    }
+}
+
+
 /**
  * All jobs must allow a pause point before entering their job proper. This
  * ensures that jobs can be paused prior to being started, then resumed later.