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%-------------------------------------------------------------------------------
% linux_storage_stack.tex - renders the storage stack of the Linux kernel
%-------------------------------------------------------------------------------
% author : Manuel Bentele
% date : Aug 29, 2019
% copyright: (c) 2019 Manuel Bentele
%-------------------------------------------------------------------------------
\begin{tikzpicture}[
box/.style = {rectangle, draw, minimum height = 0.75cm, align = center},
largeb/.style = {minimum width = 0.7\textwidth},
smallb/.style = {minimum width = 0.225\textwidth},
arrow/.style = {-triangle 45},
desc/.style = {font = \footnotesize},
node distance = 0.06\textwidth
]
\node[box, largeb, fill = hdr] (apps) {Applications};
\node[box, largeb, fill = ret, below = of apps] (vfs)
{Virtual file system (VFS)};
\node[box, smallb, fill = gray!15, left = of vfs] (dio) {Direct IO};
\node[box, smallb, fill = gray!15, right = of vfs] (pgc) {Page cache};
\draw[arrow] ([xshift=-0.3\textwidth]apps.south) -- node[right,desc] {read}
([xshift=-0.3\textwidth]vfs.north);
\draw[arrow] ([xshift=-0.1\textwidth]apps.south) -- node[right,desc] {write}
([xshift=-0.1\textwidth]vfs.north);
\draw[arrow] ([xshift=0.1\textwidth]apps.south) -- node[right,desc] {open}
([xshift=0.1\textwidth]vfs.north);
\draw[arrow] ([xshift=0.3\textwidth]apps.south) -- node[right,desc] {\dots}
([xshift=0.3\textwidth]vfs.north);
\draw[line width = 2pt] (vfs) -- (dio);
\draw[line width = 2pt] (vfs) -- (pgc);
\draw[arrow] (apps) -| node[above, align = center, desc]
{mmap\\malloc} (pgc);
\node[box, largeb, below = of vfs, fill = dat] (dmp)
{Device mapper (optional)};
\node[box, largeb, below = of dmp, fill = l2t] (blk)
{Block layer\\\scriptsize (maps BIOs to requests)};
\draw[arrow] (pgc) |- node[desc, below] {BIOs (block IOs)} (dmp);
\draw[arrow] (dio) |- node[desc, below] {BIOs (block IOs)} (dmp);
\draw[arrow] (dmp) -- node[desc, left] {BIOs} (blk);
\draw[arrow] ([xshift=-0.05\textwidth]dmp.north) --
node[desc, left, pos = 1.0] {stackable} ++(0, 0.03\textwidth) --
++(0.1\textwidth, 0) -- ++(0, -0.03\textwidth);
\node[box, largeb, fill = reb, below = of blk] (drvrq)
{Block drivers\\\scriptsize (request based)};
\node[box, smallb, fill = reb, right = of drvrq] (drvbio)
{Block drivers\\\scriptsize (BIO based)};
\draw[arrow] (blk) -- node[desc, right] {Requests} (drvrq);
\draw[arrow] (dmp.south)++(0, -0.03\textwidth) -|
node[desc, right, pos=0.725] {BIOs} (drvbio);
\node[box, fill = gray!15, below = of drvrq.south west, anchor = north west,
minimum width = 0.9865\textwidth] (hw) {Physical or virtual devices};
\draw[arrow] (drvrq) -- (drvrq |- hw.north);
\draw[arrow] (drvbio) -- (drvbio |- hw.north);
\end{tikzpicture}
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