[Qemu-block] [PATCH 3/3] blockjob: fix transaction cancel

[Vladimir Sementsov-Ogievskiy]

Prevent a situation, when some jobs from transaction are already
finished and user tries to cancel a job from this transaction.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com>
---
 blockdev.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/blockdev.c b/blockdev.c
index 59ae9e4..d1818c2 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -3772,6 +3772,17 @@ void qmp_block_job_cancel(const char *device,
         goto out;
     }
 
+    if (block_job_txn_all_success(job)) {
+        if (job->txn != NULL) {
+            error_setg(errp, "All block jobs in transaction for device '%s' 
are"
+                             "already successed", device);
+        } else {
+            error_setg(errp, "The block job for device '%s' is"
+                             "already successed", device);
+        }
+        goto out;
+    }
+
     trace_qmp_block_job_cancel(job);
     block_job_cancel(job);
 out:
-- 
1.8.3.1