mirror: auto complete active commit

Auto complete mirror job in background to prevent from
blocking synchronously

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com>
Signed-off-by: Wang WeiWei <wangww.fnst@cn.fujitsu.com>
Message-id: 1469602913-20979-7-git-send-email-xiecl.fnst@cn.fujitsu.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

block/mirror.c

@@ -916,7 +916,8 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs,
                              BlockCompletionFunc *cb,
                              void *opaque, Error **errp,
                              const BlockJobDriver *driver,
-                             bool is_none_mode, BlockDriverState *base)
+                             bool is_none_mode, BlockDriverState *base,
+                             bool auto_complete)
 {
     MirrorBlockJob *s;
 
@@ -952,6 +953,9 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs,
     s->granularity = granularity;
     s->buf_size = ROUND_UP(buf_size, granularity);
     s->unmap = unmap;
+    if (auto_complete) {
+        s->should_complete = true;
+    }
 
     s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp);
     if (!s->dirty_bitmap) {
@@ -990,14 +994,15 @@ void mirror_start(const char *job_id, BlockDriverState *bs,
     mirror_start_job(job_id, bs, target, replaces,
                      speed, granularity, buf_size, backing_mode,
                      on_source_error, on_target_error, unmap, cb, opaque, errp,
-                     &mirror_job_driver, is_none_mode, base);
+                     &mirror_job_driver, is_none_mode, base, false);
 }
 
 void commit_active_start(const char *job_id, BlockDriverState *bs,
                          BlockDriverState *base, int64_t speed,
                          BlockdevOnError on_error,
                          BlockCompletionFunc *cb,
-                         void *opaque, Error **errp)
+                         void *opaque, Error **errp,
+                         bool auto_complete)
 {
     int64_t length, base_length;
     int orig_base_flags;
@@ -1038,7 +1043,7 @@ void commit_active_start(const char *job_id, BlockDriverState *bs,
     mirror_start_job(job_id, bs, base, NULL, speed, 0, 0,
                      MIRROR_LEAVE_BACKING_CHAIN,
                      on_error, on_error, false, cb, opaque, &local_err,
-                     &commit_active_job_driver, false, base);
+                     &commit_active_job_driver, false, base, auto_complete);
     if (local_err) {
         error_propagate(errp, local_err);
         goto error_restore_flags;

blockdev.c

@@ -3090,7 +3090,7 @@ void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
             goto out;
         }
         commit_active_start(has_job_id ? job_id : NULL, bs, base_bs, speed,
-                            on_error, block_job_cb, bs, &local_err);
+                            on_error, block_job_cb, bs, &local_err, false);
     } else {
         commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, speed,
                      on_error, block_job_cb, bs,

include/block/block_int.h

@@ -702,13 +702,14 @@ void commit_start(const char *job_id, BlockDriverState *bs,
  * @cb: Completion function for the job.
  * @opaque: Opaque pointer value passed to @cb.
  * @errp: Error object.
+ * @auto_complete: Auto complete the job.
  *
  */
 void commit_active_start(const char *job_id, BlockDriverState *bs,
                          BlockDriverState *base, int64_t speed,
                          BlockdevOnError on_error,
                          BlockCompletionFunc *cb,
-                         void *opaque, Error **errp);
+                         void *opaque, Error **errp, bool auto_complete);
 /*
  * mirror_start:
  * @job_id: The id of the newly-created job, or %NULL to use the

qemu-img.c

@@ -921,7 +921,7 @@ static int img_commit(int argc, char **argv)
     };
 
     commit_active_start("commit", bs, base_bs, 0, BLOCKDEV_ON_ERROR_REPORT,
-                        common_block_job_cb, &cbi, &local_err);
+                        common_block_job_cb, &cbi, &local_err, false);
     if (local_err) {
         goto done;
     }