test-bdrv-drain: don't use BlockJob.blk

We are going to drop BlockJob.blk in further commit. For tests it's
enough to simply pass bs pointer.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Nikita Lapshin <nikita.lapshin@virtuozzo.com>

tests/unit/test-bdrv-drain.c

@@ -772,6 +772,7 @@ static void test_iothread_drain_subtree(void)
 
 typedef struct TestBlockJob {
     BlockJob common;
+    BlockDriverState *bs;
     int run_ret;
     int prepare_ret;
     bool running;
@@ -783,7 +784,7 @@ static int test_job_prepare(Job *job)
     TestBlockJob *s = container_of(job, TestBlockJob, common.job);
 
     /* Provoke an AIO_WAIT_WHILE() call to verify there is no deadlock */
-    blk_flush(s->common.blk);
+    bdrv_flush(s->bs);
     return s->prepare_ret;
 }
 
@@ -792,7 +793,7 @@ static void test_job_commit(Job *job)
     TestBlockJob *s = container_of(job, TestBlockJob, common.job);
 
     /* Provoke an AIO_WAIT_WHILE() call to verify there is no deadlock */
-    blk_flush(s->common.blk);
+    bdrv_flush(s->bs);
 }
 
 static void test_job_abort(Job *job)
@@ -800,7 +801,7 @@ static void test_job_abort(Job *job)
     TestBlockJob *s = container_of(job, TestBlockJob, common.job);
 
     /* Provoke an AIO_WAIT_WHILE() call to verify there is no deadlock */
-    blk_flush(s->common.blk);
+    bdrv_flush(s->bs);
 }
 
 static int coroutine_fn test_job_run(Job *job, Error **errp)
@@ -915,6 +916,7 @@ static void test_blockjob_common_drain_node(enum drain_type drain_type,
     tjob = block_job_create("job0", &test_job_driver, NULL, src,
                             0, BLK_PERM_ALL,
                             0, 0, NULL, NULL, &error_abort);
+    tjob->bs = src;
     job = &tjob->common;
     block_job_add_bdrv(job, "target", target, 0, BLK_PERM_ALL, &error_abort);
 
@@ -1538,6 +1540,7 @@ typedef struct TestDropBackingBlockJob {
     bool should_complete;
     bool *did_complete;
     BlockDriverState *detach_also;
+    BlockDriverState *bs;
 } TestDropBackingBlockJob;
 
 static int coroutine_fn test_drop_backing_job_run(Job *job, Error **errp)
@@ -1557,7 +1560,7 @@ static void test_drop_backing_job_commit(Job *job)
     TestDropBackingBlockJob *s =
         container_of(job, TestDropBackingBlockJob, common.job);
 
-    bdrv_set_backing_hd(blk_bs(s->common.blk), NULL, &error_abort);
+    bdrv_set_backing_hd(s->bs, NULL, &error_abort);
     bdrv_set_backing_hd(s->detach_also, NULL, &error_abort);
 
     *s->did_complete = true;
@@ -1657,6 +1660,7 @@ static void test_blockjob_commit_by_drained_end(void)
     job = block_job_create("job", &test_drop_backing_job_driver, NULL,
                            bs_parents[2], 0, BLK_PERM_ALL, 0, 0, NULL, NULL,
                            &error_abort);
+    job->bs = bs_parents[2];
 
     job->detach_also = bs_parents[0];
     job->did_complete = &job_has_completed;