[PATCH v5 COLOPre 18/18] tools/libxl: seperate device init/cleanup from checkpoint device layer

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

From: Yang Hongyang <hongyang.yang@easystack.cn>

we call (init|cleanup)_subkind_nic and (init|cleanup)_subkind_drbd_disk
directly in checkpoint device. Move them to libxl_remus.c, Call them before
calling libxl__checkpoint_devices_setup() or after calling
libxl__checkpoint_devices_teardown().
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 | 42 ++---------------------------------
 tools/libxl/libxl_remus.c             | 42 +++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 40 deletions(-)

diff --git a/tools/libxl/libxl_checkpoint_device.c b/tools/libxl/libxl_checkpoint_device.c
index bbc6dc4..0a16dbb 100644
--- a/tools/libxl/libxl_checkpoint_device.c
+++ b/tools/libxl/libxl_checkpoint_device.c
@@ -17,38 +17,6 @@
 
 #include "libxl_internal.h"
 
-/*----- helper functions -----*/
-
-static int init_device_subkind(libxl__checkpoint_devices_state *cds)
-{
-    /* init device subkind-specific state in the libxl ctx */
-    int rc;
-    STATE_AO_GC(cds->ao);
-
-    if (libxl__netbuffer_enabled(gc)) {
-        rc = init_subkind_nic(cds);
-        if (rc) goto out;
-    }
-
-    rc = init_subkind_drbd_disk(cds);
-    if (rc) goto out;
-
-    rc = 0;
-out:
-    return rc;
-}
-
-static void cleanup_device_subkind(libxl__checkpoint_devices_state *cds)
-{
-    /* cleanup device subkind-specific state in the libxl ctx */
-    STATE_AO_GC(cds->ao);
-
-    if (libxl__netbuffer_enabled(gc))
-        cleanup_subkind_nic(cds);
-
-    cleanup_subkind_drbd_disk(cds);
-}
-
 /*----- setup() and teardown() -----*/
 
 /* callbacks */
@@ -86,14 +54,10 @@ static void checkpoint_devices_setup(libxl__egc *egc,
 void libxl__checkpoint_devices_setup(libxl__egc *egc,
                                      libxl__checkpoint_devices_state *cds)
 {
-    int i, rc;
+    int i;
 
     STATE_AO_GC(cds->ao);
 
-    rc = init_device_subkind(cds);
-    if (rc)
-        goto out;
-
     cds->num_devices = 0;
     cds->num_nics = 0;
     cds->num_disks = 0;
@@ -126,7 +90,7 @@ void libxl__checkpoint_devices_setup(libxl__egc *egc,
     return;
 
 out:
-    cds->callback(egc, cds, rc);
+    cds->callback(egc, cds, 0);
 }
 
 static void checkpoint_devices_setup(libxl__egc *egc,
@@ -263,8 +227,6 @@ static void devices_teardown_cb(libxl__egc *egc,
     cds->disks = NULL;
     cds->num_disks = 0;
 
-    cleanup_device_subkind(cds);
-
     cds->callback(egc, cds, rc);
 }
 
diff --git a/tools/libxl/libxl_remus.c b/tools/libxl/libxl_remus.c
index 00e3c80..07a1699 100644
--- a/tools/libxl/libxl_remus.c
+++ b/tools/libxl/libxl_remus.c
@@ -26,6 +26,38 @@ static const libxl__checkpoint_device_instance_ops *remus_ops[] = {
     NULL,
 };
 
+/*----- helper functions -----*/
+
+static int init_device_subkind(libxl__checkpoint_devices_state *cds)
+{
+    /* init device subkind-specific state in the libxl ctx */
+    int rc;
+    STATE_AO_GC(cds->ao);
+
+    if (libxl__netbuffer_enabled(gc)) {
+        rc = init_subkind_nic(cds);
+        if (rc) goto out;
+    }
+
+    rc = init_subkind_drbd_disk(cds);
+    if (rc) goto out;
+
+    rc = 0;
+out:
+    return rc;
+}
+
+static void cleanup_device_subkind(libxl__checkpoint_devices_state *cds)
+{
+    /* cleanup device subkind-specific state in the libxl ctx */
+    STATE_AO_GC(cds->ao);
+
+    if (libxl__netbuffer_enabled(gc))
+        cleanup_subkind_nic(cds);
+
+    cleanup_subkind_drbd_disk(cds);
+}
+
 /*-------------------- Remus setup and teardown ---------------------*/
 
 static void remus_setup_done(libxl__egc *egc,
@@ -63,6 +95,12 @@ void libxl__remus_setup(libxl__egc *egc, libxl__remus_state *rs)
     cds->concrete_data = rs;
     rs->interval = info->interval;
 
+    if (init_device_subkind(cds)) {
+        LOG(ERROR, "Remus: failed to init device subkind for guest %u",
+            dss->domid);
+        goto out;
+    }
+
     dss->sws.checkpoint_callback = remus_checkpoint_stream_written;
 
     libxl__checkpoint_devices_setup(egc, cds);
@@ -99,6 +137,8 @@ static void remus_setup_failed(libxl__egc *egc,
         LOG(ERROR, "Remus: failed to teardown device after setup failed"
             " for guest with domid %u, rc %d", dss->domid, rc);
 
+    cleanup_device_subkind(cds);
+
     dss->callback(egc, dss, rc);
 }
 
@@ -133,6 +173,8 @@ static void remus_teardown_done(libxl__egc *egc,
         LOG(ERROR, "Remus: failed to teardown device for guest with domid %u,"
             " rc %d", dss->domid, rc);
 
+    cleanup_device_subkind(cds);
+
     dss->callback(egc, dss, rc);
 }
 
-- 
2.5.0