qcow2: Add basic data-file infrastructure
This adds a .bdrv_open option to specify the external data file node.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 2b8afbb..de4d4fd 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -3080,6 +3080,10 @@
# encrypted images, except when doing a metadata-only
# probe of the image. (since 2.10)
#
+# @data-file: reference to or definition of the external data file.
+# This may only be specified for images that require an
+# external data file. (since 4.0)
+#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsQcow2',
@@ -3094,7 +3098,8 @@
'*l2-cache-entry-size': 'int',
'*refcount-cache-size': 'int',
'*cache-clean-interval': 'int',
- '*encrypt': 'BlockdevQcow2Encryption' } }
+ '*encrypt': 'BlockdevQcow2Encryption',
+ '*data-file': 'BlockdevRef' } }
##
# @SshHostKeyCheckMode:
