qemu: Defer support checks for external active snapshots to blockdev code or qemu

Remove libvirt's support check for the target of an external snapshot to
the blockdev code or qemu. This will potentially require a more complex
cleanup but removes a level of hardcoded feature checks.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 773a0ee4ea24b643eb3545ef5d3f57a9c1661327..7124349f8e1824a253f2eea7c003f941b0f1ef23 100644 (file)
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -14917,7 +14917,8 @@ qemuDomainSnapshotPrepareDiskExternalInactive(virDomainSnapshotDiskDefPtr snapdi
 
 static int
 qemuDomainSnapshotPrepareDiskExternalActive(virDomainSnapshotDiskDefPtr snapdisk,
-                                            virDomainDiskDefPtr domdisk)
+                                            virDomainDiskDefPtr domdisk,
+                                            bool blockdev)
 {
     int actualType = virStorageSourceGetActualType(snapdisk->src);
 
@@ -14934,6 +14935,10 @@ qemuDomainSnapshotPrepareDiskExternalActive(virDomainSnapshotDiskDefPtr snapdisk
         break;
 
     case VIR_STORAGE_TYPE_NETWORK:
+        /* defer all of the checking to either qemu or libvirt's blockdev code */
+        if (blockdev)
+            break;
+
         switch ((virStorageNetProtocol) snapdisk->src->protocol) {
         case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
             break;
@@ -14981,7 +14986,8 @@ static int
 qemuDomainSnapshotPrepareDiskExternal(virDomainDiskDefPtr disk,
                                       virDomainSnapshotDiskDefPtr snapdisk,
                                       bool active,
-                                      bool reuse)
+                                      bool reuse,
+                                      bool blockdev)
 {
     struct stat st;
     int err;
@@ -15004,7 +15010,7 @@ qemuDomainSnapshotPrepareDiskExternal(virDomainDiskDefPtr disk,
         if (qemuDomainSnapshotPrepareDiskExternalInactive(snapdisk, disk) < 0)
             return -1;
     } else {
-        if (qemuDomainSnapshotPrepareDiskExternalActive(snapdisk, disk) < 0)
+        if (qemuDomainSnapshotPrepareDiskExternalActive(snapdisk, disk, blockdev) < 0)
             return -1;
     }
 
@@ -15105,6 +15111,8 @@ qemuDomainSnapshotPrepare(virDomainObjPtr vm,
                           virDomainSnapshotDefPtr def,
                           unsigned int *flags)
 {
+    qemuDomainObjPrivatePtr priv = vm->privateData;
+    bool blockdev = virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV);
     int ret = -1;
     size_t i;
     bool active = virDomainObjIsActive(vm);
@@ -15163,7 +15171,7 @@ qemuDomainSnapshotPrepare(virDomainObjPtr vm,
             }
 
             if (qemuDomainSnapshotPrepareDiskExternal(dom_disk, disk,
-                                                      active, reuse) < 0)
+                                                      active, reuse, blockdev) < 0)
                 goto cleanup;
 
             external++;