job: Add reference counting

This moves reference counting from BlockJob to Job.

In order to keep calling the BlockJob cleanup code when the job is
deleted via job_unref(), introduce a new JobDriver.free callback. Every
block job must use block_job_free() for this callback, this is asserted
in block_job_create().

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

1 files changed, 1 insertions, 0 deletions

diff --git a/block/stream.c b/block/stream.c
index cb723f190a..7273d2213c 100644
--- a/block/stream.c
+++ b/block/stream.c
@@ -212,6 +212,7 @@ static const BlockJobDriver stream_job_driver = {
     .job_driver = {
         .instance_size = sizeof(StreamBlockJob),
         .job_type      = JOB_TYPE_STREAM,
+        .free          = block_job_free,
     },
     .start         = stream_run,
 };