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-rw-r--r--qapi/block-core.json6
1 files changed, 6 insertions, 0 deletions
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 76bf50f813..dd763dcf87 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -2065,6 +2065,12 @@
# BLOCK_JOB_CANCELLED event. Before that happens the job is still visible when
# enumerated using query-block-jobs.
#
+# Note that if you issue 'block-job-cancel' after 'drive-mirror' has indicated
+# (via the event BLOCK_JOB_READY) that the source and destination are
+# synchronized, then the event triggered by this command changes to
+# BLOCK_JOB_COMPLETED, to indicate that the mirroring has ended and the
+# destination now has a point-in-time copy tied to the time of the cancellation.
+#
# For streaming, the image file retains its backing file unless the streaming
# operation happens to complete just as it is being cancelled. A new streaming
# operation can be started at a later time to finish copying all data from the