This is used by primay to read records sent by secondary.
Signed-off-by: Yang Hongyang <yan...@cn.fujitsu.com>
---
tools/libxl/libxl_create.c | 1 +
tools/libxl/libxl_internal.h | 1 +
tools/libxl/libxl_stream_read.c | 17 +++++++++++++++++
3 files changed, 19 insertions(+)
diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index 1d4b13b..1af7103 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -978,6 +978,7 @@ static void domcreate_bootloader_done(libxl__egc *egc,
dcs->srs.dcs = dcs;
dcs->srs.fd = restore_fd;
dcs->srs.legacy = (dcs->restore_params.stream_version == 1);
+ dcs->srs.back_channel = false;
dcs->srs.completion_callback = domcreate_stream_done;
libxl__stream_read_start(egc, &dcs->srs);
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 2634836..05cee04 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -3358,6 +3358,7 @@ struct libxl__stream_read_state {
libxl__domain_create_state *dcs;
int fd;
bool legacy;
+ bool back_channel;
void (*completion_callback)(libxl__egc *egc,
libxl__stream_read_state *srs,
int rc);
diff --git a/tools/libxl/libxl_stream_read.c b/tools/libxl/libxl_stream_read.c
index 2d17403..b924f05 100644
--- a/tools/libxl/libxl_stream_read.c
+++ b/tools/libxl/libxl_stream_read.c
@@ -104,6 +104,15 @@
* Depending on the contents of the stream, there are likely to be several
* parallel tasks being managed. check_all_finished() is used to join all
* tasks in both success and error cases.
+ *
+ * For back channel stream:
+ * - libxl__stream_read_start()
+ * - Set up the stream to running state
+ *
+ * - libxl__stream_read_continue()
+ * - Set up reading the next record from a started stream.
+ * Add some codes to process_record() to handle the record.
+ * Then call stream->checkpoint_callback() to return.
*/
/* Success/error/cleanup handling. */
@@ -200,6 +209,9 @@ void libxl__stream_read_start(libxl__egc *egc,
stream->running = true;
stream->phase = SRS_PHASE_NORMAL;
+ if (stream->back_channel)
+ return;
+
if (stream->legacy) {
/* Convert the legacy stream. */
libxl__conversion_helper_state *chs = &stream->chs;
@@ -700,6 +712,11 @@ static void stream_done(libxl__egc *egc,
assert(!stream->in_checkpoint);
stream->running = false;
+ if (stream->back_channel) {
+ stream->completion_callback(egc, stream, stream->rc);
+ return;
+ }
+
if (stream->incoming_record)
free_record(stream->incoming_record);
--
1.9.1
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