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+.. SPDX-License-Identifier: GPL-2.0
+
+.. The here included files are intended to help understand the implementation
+
+Data flows that Relate some functions, and write packets
+========================================================
+
+.. kernel-figure:: DRBD-8.3-data-packets.svg
+ :alt: DRBD-8.3-data-packets.svg
+ :align: center
+
+.. kernel-figure:: DRBD-data-packets.svg
+ :alt: DRBD-data-packets.svg
+ :align: center
+
+
+Sub graphs of DRBD's state transitions
+======================================
+
+.. kernel-figure:: conn-states-8.dot
+ :alt: conn-states-8.dot
+ :align: center
+
+.. kernel-figure:: disk-states-8.dot
+ :alt: disk-states-8.dot
+ :align: center
+
+.. kernel-figure:: peer-states-8.dot
+ :alt: peer-states-8.dot
+ :align: center