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-rw-r--r--qapi-schema.json7
1 files changed, 7 insertions, 0 deletions
diff --git a/qapi-schema.json b/qapi-schema.json
index e04949de52..1ff607ac3c 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1994,6 +1994,13 @@
# user needs to complete the job with the block-job-complete
# command after getting the ready event. (Since 2.0)
#
+# If the base image is smaller than top, then the base image
+# will be resized to be the same size as top. If top is
+# smaller than the base image, the base will not be
+# truncated. If you want the base image size to match the
+# size of the smaller top, you can safely truncate it
+# yourself once the commit operation successfully completes.
+#
#
# @speed: #optional the maximum speed, in bytes per second
#