migration: introduce a delete_snapshot wrapper

Make snapshot deletion consistent with the snapshot save
and load commands by using a wrapper around the blockdev
layer. The main difference is that we get upfront validation
of the passed in device list (if any).

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20210204124834.774401-10-berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/migration/savevm.c b/migration/savevm.c
index 0b27a8c55a..0c5d61ae20 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -3071,6 +3071,20 @@ err_drain:
     return false;
 }
 
+bool delete_snapshot(const char *name, bool has_devices,
+                     strList *devices, Error **errp)
+{
+    if (!bdrv_all_can_snapshot(has_devices, devices, errp)) {
+        return false;
+    }
+
+    if (bdrv_all_delete_snapshot(name, has_devices, devices, errp) < 0) {
+        return false;
+    }
+
+    return true;
+}
+
 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
 {
     qemu_ram_set_idstr(mr->ram_block,