man: document readahdea split-off

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+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+        "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="sd-daemon">
+
+        <refentryinfo>
+                <title>sd-readahead</title>
+                <productname>systemd</productname>
+
+                <authorgroup>
+                        <author>
+                                <contrib>Developer</contrib>
+                                <firstname>Lennart</firstname>
+                                <surname>Poettering</surname>
+                                <email>lennart@poettering.net</email>
+                        </author>
+                </authorgroup>
+        </refentryinfo>
+
+        <refmeta>
+                <refentrytitle>sd-readahead</refentrytitle>
+                <manvolnum>7</manvolnum>
+        </refmeta>
+
+        <refnamediv>
+                <refname>sd-readahead</refname>
+                <refpurpose>Reference implementation of APIs for
+                controlling boot-time read-ahead</refpurpose>
+        </refnamediv>
+
+        <refsynopsisdiv>
+                <funcsynopsis>
+                        <funcsynopsisinfo>#include "sd-readahead.h"</funcsynopsisinfo>
+                </funcsynopsis>
+        </refsynopsisdiv>
+
+        <refsect1>
+                <title>Description</title>
+
+                <para><filename>sd-readahead.c</filename> and
+                <filename>sd-readahead.h</filename> provide a
+                reference implementation for APIs for controlling boot-time
+                read-ahead, as implemented by the read-ahead subsystem
+                of the
+                <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+                init system.</para>
+
+                <para>See
+                <citerefentry><refentrytitle>sd_readahead</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+                for more information about the function
+                implemented.</para>
+        </refsect1>
+
+        <refsect1>
+                <title>Notes</title>
+
+                <para>This interface is provided by the reference
+                implementation of APIs for controlling boot-time
+                read-ahead and distributed with the systemd
+                package. The algorithms it implements are simple, and
+                can easily be reimplemented in daemons if it is
+                important to support this interface without using the
+                reference implementation. See the respective function
+                man pages for details.</para>
+
+                <para>In addition, for details about the algorithms
+                check the liberally licensed reference implementation
+                sources:
+                <ulink url="http://cgit.freedesktop.org/systemd/tree/src/sd-readahead.c"/>
+                resp. <ulink url="http://cgit.freedesktop.org/systemd/tree/src/sd-readahead.h"/></para>
+
+                <para>These APIs are implemented in the reference
+                implementation's drop-in
+                <filename>sd-readahead.c</filename> and
+                <filename>sd-readahead.h</filename> files. It is
+                recommended that applications consuming these APIs copy
+                the implementation into their source tree, either
+                verbatim or in excerpts. These interfaces are
+                currently not available in a dynamic library.</para>
+
+                <para>The functions provided by this interface become
+                NOPs when -DDISABLE_SYSTEMD is set during
+                compilation. In addition, if
+                <filename>sd-readhead.c</filename> is compiled on
+                non-Linux systems it becomes NOPs.</para>
+        </refsect1>
+
+        <refsect1>
+                <title>See Also</title>
+                <para>
+                        <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>sd_readahead</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>7</manvolnum></citerefentry>
+                </para>
+        </refsect1>
+
+</refentry>