[PATCH v3 2/5] remus: resume immediately if libxl__xc_domain_save_done() completes

[Wen Congyang <wency@cn.fujitsu.com>]

For example: if the secondary host is down, and we fail to send the data to
the secondary host. xc_domain_save() returns 0. So in the function
libxl__xc_domain_save_done(), rc is 0(the helper program exits normally),
and retval is 0(it is xc_domain_save()'s return value). In such case, we
just need to complete the stream.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
---
 tools/libxl/libxl_stream_write.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/libxl/libxl_stream_write.c b/tools/libxl/libxl_stream_write.c
index 80d9208..82e7719 100644
--- a/tools/libxl/libxl_stream_write.c
+++ b/tools/libxl/libxl_stream_write.c
@@ -354,8 +354,17 @@ void libxl__xc_domain_save_done(libxl__egc *egc, void *dss_void,
      * alive, and check_all_finished() may have torn it down around us.
      * If the stream is not still alive, we must not continue any work.
      */
-    if (libxl__stream_write_inuse(stream))
-        write_emulator_xenstore_record(egc, stream);
+    if (libxl__stream_write_inuse(stream)) {
+        if (dss->remus)
+            /*
+             * For remus, if libxl__xc_domain_save_done() completes,
+             * there was an error sending data to the secondary.
+             * Resume the primary ASAP.
+             */
+            stream_complete(egc, stream, 0);
+        else
+            write_emulator_xenstore_record(egc, stream);
+    }
 }
 
 static void write_emulator_xenstore_record(libxl__egc *egc,
-- 
2.5.0