block: add block_job_query

Extract it out of the implementation of info block-jobs.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

blockdev.c

@@ -1232,19 +1232,8 @@ static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
     BlockJob *job = bs->job;
 
     if (job) {
-        BlockJobInfoList *elem;
+        BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
-        BlockJobInfo *info = g_new(BlockJobInfo, 1);
+        elem->value = block_job_query(bs->job);
-        *info = (BlockJobInfo){
-            .type   = g_strdup(job->job_type->job_type),
-            .device = g_strdup(bdrv_get_device_name(bs)),
-            .len    = job->len,
-            .offset = job->offset,
-            .speed  = job->speed,
-        };
-
-        elem = g_new0(BlockJobInfoList, 1);
-        elem->value = info;
-
         (*prev)->next = elem;
         *prev = elem;
     }

blockjob.c

@@ -161,3 +161,14 @@ void block_job_sleep_ns(BlockJob *job, QEMUClock *clock, int64_t ns)
         job->busy = true;
     }
 }
+
+BlockJobInfo *block_job_query(BlockJob *job)
+{
+    BlockJobInfo *info = g_new0(BlockJobInfo, 1);
+    info->type   = g_strdup(job->job_type->job_type);
+    info->device = g_strdup(bdrv_get_device_name(job->bs));
+    info->len    = job->len;
+    info->offset = job->offset;
+    info->speed  = job->speed;
+    return info;
+}

blockjob.h

@@ -162,6 +162,14 @@ void block_job_cancel(BlockJob *job);
  */
 bool block_job_is_cancelled(BlockJob *job);
 
+/**
+ * block_job_query:
+ * @job: The job to get information about.
+ *
+ * Return information about a job.
+ */
+BlockJobInfo *block_job_query(BlockJob *job);
+
 /**
  * block_job_cancel_sync:
  * @job: The job to be canceled.