qmp: add block_stream command

Add the block_stream command, which starts copy backing file contents
into the image file.  Also add the BLOCK_JOB_COMPLETED QMP event which
is emitted when image streaming completes.  Later patches add control
over the background copy speed, cancelation, and querying running
streaming operations.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/hmp.c b/hmp.c
index 4664dbe8e..cde8d7a5c 100644
--- a/hmp.c
+++ b/hmp.c
@@ -783,3 +783,14 @@ void hmp_block_set_io_throttle(Monitor *mon, const QDict *qdict)
                               qdict_get_int(qdict, "iops_wr"), &err);
     hmp_handle_error(mon, &err);
 }
+
+void hmp_block_stream(Monitor *mon, const QDict *qdict)
+{
+    Error *error = NULL;
+    const char *device = qdict_get_str(qdict, "device");
+    const char *base = qdict_get_try_str(qdict, "base");
+
+    qmp_block_stream(device, base != NULL, base, &error);
+
+    hmp_handle_error(mon, &error);
+}