docs: blockdev: convert to ReST

Rename the blockdev documentation files to ReST, add an
index for them and adjust in order to produce a nice html
output via the Sphinx build system.

The drbd sub-directory contains some graphs and data flows.
Add those too to the documentation.

At its new index.rst, let's add a :orphan: while this is not linked to
the main index.rst file, in order to avoid build warnings.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/Documentation/blockdev/drbd/figures.rst b/Documentation/blockdev/drbd/figures.rst
new file mode 100644
index 000000000000..3e3fd4b8a478
--- /dev/null
+++ b/Documentation/blockdev/drbd/figures.rst
@@ -0,0 +1,28 @@
+.. 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:: node-states-8.dot
+    :alt:   node-states-8.dot
+    :align: center