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-rw-r--r--include/block/block_int.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/block/block_int.h b/include/block/block_int.h
index a23cabaddd..438feba4e5 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -711,6 +711,12 @@ struct BdrvChild {
uint64_t backup_perm;
uint64_t backup_shared_perm;
+ /*
+ * This link is frozen: the child can neither be replaced nor
+ * detached from the parent.
+ */
+ bool frozen;
+
QLIST_ENTRY(BdrvChild) next;
QLIST_ENTRY(BdrvChild) next_parent;
};