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%-------------------------------------------------------------------------------
% qcow2_reading.tex - shows how QCOW2 clusters are mapped for reading
%-------------------------------------------------------------------------------
% author : Manuel Bentele
% date : Aug 29, 2019
% copyright: (c) 2019 Manuel Bentele
%-------------------------------------------------------------------------------
\begin{tikzpicture}[
arrow/.style = {-triangle 45}
]
\node[inner sep = 0, anchor = north] (blkdev) at (0, 0) {
\renewcommand*{\arraystretch}{1.3}
\begin{tabular}{|c|} \hline
\\ \hline
\\ \hline
\\ \hline
\\ \hline
\cellcolor{dat} \\ \hline
\\ \hline
\cellcolor{dat} \\ \hline
\cellcolor{dat} \\ \hline
\\ \hline
\cellcolor{dat} \\ \hline
\end{tabular}
};
\node[inner sep = 0, anchor = north, right = of blkdev] (qcow2) {
\renewcommand*{\arraystretch}{1.3}
\hspace*{-0.25cm}
\begin{tabular}{|c|} \hline
\cellcolor{hdr}Header \\ \hline
\cellcolor{ret}Refcount table \\ \hline
\cellcolor{reb}Refcount block \\ \hline
\cellcolor{l1t}L1~table \\ \hline
\cellcolor{l2t}L2~table \\ \hline
\cellcolor{dat}Data cluster \\ \hline
\cellcolor{l2t}L2~table \\ \hline
\cellcolor{dat}Data cluster \\ \hline
\cellcolor{dat}Data cluster \\ \hline
\cellcolor{dat}Data cluster \\ \hline
\end{tabular}
};
\draw[triangle 45-triangle 45] ($(blkdev.north west)!0!(blkdev.south west)$) -- node[left] {$O$} ($(blkdev.north west)!0.6!(blkdev.south west)$);
\draw[triangle 45-triangle 45] ($(blkdev.north west)!0.6!(blkdev.south west)$) -- node[left] {$S$} ($(blkdev.north west)!0.8!(blkdev.south west)$);
\node[above = 0.5 of blkdev, align = center] {Block\\device};
\node[above = 0.5 of qcow2, align = center] {QCOW2\\file format};
\draw[arrow] ($(blkdev.north east)!0.45!(blkdev.south east)$) -- ($(qcow2.north west)!0.75!(qcow2.south west)$);
\draw[arrow] ($(blkdev.north east)!0.65!(blkdev.south east)$) -- ($(qcow2.north west)!0.55!(qcow2.south west)$);
\draw[arrow] ($(blkdev.north east)!0.75!(blkdev.south east)$) -- ($(qcow2.north west)!0.85!(qcow2.south west)$);
\draw[arrow] ($(blkdev.north east)!0.95!(blkdev.south east)$) -- ($(qcow2.north west)!0.95!(qcow2.south west)$);
\end{tikzpicture}
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