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, 2 insertions, 2 deletions

diff --git a/qemu-img.c b/qemu-img.c
index 2b5a570..911456b 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -861,7 +861,7 @@ static void run_block_job(BlockJob *job, Error **errp)
     int ret = 0;
 
     aio_context_acquire(aio_context);
-    block_job_ref(job);
+    job_ref(&job->job);
     do {
         aio_poll(aio_context, true);
         qemu_progress_print(job->len ?
@@ -873,7 +873,7 @@ static void run_block_job(BlockJob *job, Error **errp)
     } else {
         ret = job->ret;
     }
-    block_job_unref(job);
+    job_unref(&job->job);
     aio_context_release(aio_context);
 
     /* publish completion progress only when success */