[PATCH v6 16/18] tools/libxl: store remus_ops in checkpoint device state

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

Checkpoint device is an abstract layer to do checkpoint.
COLO can also use it to do checkpoint. But there are
still some codes in checkpoint device which touch remus.

This patch and the following 2 will seperate remus from
checkpoint device layer.

We use remus ops directly in checkpoint device. Store it
in checkpoint device state so that we do not aware of
remus_ops in the checkpoint device layer.

it is pure refactoring and no functional changes.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Yang Hongyang <hongyang.yang@easystack.cn>
Acked-by:Ian Campbell <ian.campbell@citrix.com>
---
 tools/libxl/libxl_checkpoint_device.c | 10 +---------
 tools/libxl/libxl_internal.h          |  2 ++
 tools/libxl/libxl_remus.c             |  9 +++++++++
 3 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/tools/libxl/libxl_checkpoint_device.c b/tools/libxl/libxl_checkpoint_device.c
index 226f159..bbc6dc4 100644
--- a/tools/libxl/libxl_checkpoint_device.c
+++ b/tools/libxl/libxl_checkpoint_device.c
@@ -17,14 +17,6 @@
 
 #include "libxl_internal.h"
 
-extern const libxl__checkpoint_device_instance_ops remus_device_nic;
-extern const libxl__checkpoint_device_instance_ops remus_device_drbd_disk;
-static const libxl__checkpoint_device_instance_ops *remus_ops[] = {
-    &remus_device_nic,
-    &remus_device_drbd_disk,
-    NULL,
-};
-
 /*----- helper functions -----*/
 
 static int init_device_subkind(libxl__checkpoint_devices_state *cds)
@@ -172,7 +164,7 @@ static void device_setup_iterate(libxl__egc *egc, libxl__ao_device *aodev)
         goto out;
 
     do {
-        dev->ops = remus_ops[++dev->ops_index];
+        dev->ops = dev->cds->ops[++dev->ops_index];
         if (!dev->ops) {
             libxl_device_nic * nic = NULL;
             libxl_device_disk * disk = NULL;
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 5b99d6e..914ce94 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -2895,6 +2895,8 @@ struct libxl__checkpoint_devices_state {
     uint32_t domid;
     libxl__checkpoint_callback *callback;
     int device_kind_flags;
+    /* The ops must be pointer array, and the last ops must be NULL */
+    const libxl__checkpoint_device_instance_ops **ops;
 
     /*----- private for abstract layer only -----*/
 
diff --git a/tools/libxl/libxl_remus.c b/tools/libxl/libxl_remus.c
index d088dad..3375331 100644
--- a/tools/libxl/libxl_remus.c
+++ b/tools/libxl/libxl_remus.c
@@ -18,6 +18,14 @@
 
 #include "libxl_internal.h"
 
+extern const libxl__checkpoint_device_instance_ops remus_device_nic;
+extern const libxl__checkpoint_device_instance_ops remus_device_drbd_disk;
+static const libxl__checkpoint_device_instance_ops *remus_ops[] = {
+    &remus_device_nic,
+    &remus_device_drbd_disk,
+    NULL,
+};
+
 /*-------------------- Remus setup and teardown ---------------------*/
 
 static void remus_setup_done(libxl__egc *egc,
@@ -50,6 +58,7 @@ void libxl__remus_setup(libxl__egc *egc,
     cds->ao = ao;
     cds->domid = dss->domid;
     cds->callback = remus_setup_done;
+    cds->ops = remus_ops;
 
     dss->sws.checkpoint_callback = remus_checkpoint_stream_written;
 
-- 
2.5.0