From e62e6670f77a886d26fbfe612e6f4fa0c2e0c98b Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 5 Oct 2010 20:44:37 +0200
Subject: [PATCH] man: document readahdea split-off

---
 Makefile.am          |   1 +
 man/sd-daemon.xml    |   3 +-
 man/sd-readahead.xml | 117 +++++++++++++++++++++++++++++++++++++++++++
 man/sd_readahead.xml |  28 +++++------
 4 files changed, 134 insertions(+), 15 deletions(-)
 create mode 100644 man/sd-readahead.xml

diff --git a/Makefile.am b/Makefile.am
index 11abadff..c06f1ecb 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -456,6 +456,7 @@ MANPAGES = \
 	man/systemd.exec.5 \
 	man/daemon.7 \
 	man/sd-daemon.7 \
+	man/sd-readahead.7 \
 	man/runlevel.8 \
 	man/telinit.8 \
 	man/halt.8 \
diff --git a/man/sd-daemon.xml b/man/sd-daemon.xml
index e3ac68ee..cbfe28f8 100644
--- a/man/sd-daemon.xml
+++ b/man/sd-daemon.xml
@@ -155,7 +155,8 @@
                         <citerefentry><refentrytitle>daemon</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
-                        <citerefentry><refentrytitle>fprintf</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+                        <citerefentry><refentrytitle>fprintf</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>sd-readahead</refentrytitle><manvolnum>7</manvolnum></citerefentry>
                 </para>
         </refsect1>
 
diff --git a/man/sd-readahead.xml b/man/sd-readahead.xml
new file mode 100644
index 00000000..819691e4
--- /dev/null
+++ b/man/sd-readahead.xml
@@ -0,0 +1,117 @@
+<?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>
diff --git a/man/sd_readahead.xml b/man/sd_readahead.xml
index 178f907a..ac54dc48 100644
--- a/man/sd_readahead.xml
+++ b/man/sd_readahead.xml
@@ -44,7 +44,7 @@
 
         <refnamediv>
                 <refname>sd_readahead</refname>
-                <refpurpose>Control ongoing disk read-ahead operations</refpurpose>
+                <refpurpose>Control ongoing disk boot-time read-ahead operations</refpurpose>
         </refnamediv>
 
         <refsynopsisdiv>
@@ -62,7 +62,7 @@
                 <title>Description</title>
                 <para><function>sd_readahead()</function> may be
                 called by programs involved with early boot-up to
-                control ongoing disk read-ahead operations. It may be
+                control ongoing boot-time disk read-ahead operations. It may be
                 used to terminate read-ahead operations in case an
                 uncommon disk access pattern is to be expected and
                 hence read-ahead replay or collection is unlikely to
@@ -115,12 +115,12 @@
                 <title>Notes</title>
 
                 <para>This function is provided by the reference
-                implementation of APIs for new-style daemons and
-                distributed with the systemd package. The algorithm
-                it implements is simple, and can easily be
-                reimplemented in daemons if it is important to support
-                this interface without using the reference
-                implementation.</para>
+                implementation of APIs for controlling boot-time
+                read-ahead and distributed with the systemd
+                package. The algorithm it implements is simple, and
+                can easily be reimplemented in daemons if it is
+                important to support this interface without using the
+                reference implementation.</para>
 
                 <para>Internally, this function creates a file in
                 <filename>/dev/.systemd/readahead/</filename> which is
@@ -129,18 +129,18 @@
 
                 <para>For details about the algorithm check the
                 liberally licensed reference implementation sources:
-                <ulink url="http://cgit.freedesktop.org/systemd/tree/src/sd-daemon.c"/>
+                <ulink url="http://cgit.freedesktop.org/systemd/tree/src/sd-readahead.c"/>
                 resp. <ulink
-                url="http://cgit.freedesktop.org/systemd/tree/src/sd-daemon.h"/></para>
+                url="http://cgit.freedesktop.org/systemd/tree/src/sd-readahead.h"/></para>
 
                 <para><function>sd_readahead()</function> is
                 implemented in the reference implementation's drop-in
-                <filename>sd-daemon.c</filename> and
-                <filename>sd-daemon.h</filename> files. It is
+                <filename>sd-readahead.c</filename> and
+                <filename>sd-readahead.h</filename> files. It is
                 recommended that applications consuming this API copy
                 the implementation into their source tree. For more
                 details about the reference implementation see
-                <citerefentry><refentrytitle>sd_daemon</refentrytitle><manvolnum>7</manvolnum></citerefentry></para>
+                <citerefentry><refentrytitle>sd-readahead</refentrytitle><manvolnum>7</manvolnum></citerefentry></para>
 
                 <para>If -DDISABLE_SYSTEMD is set during compilation
                 this function will always return 0 and otherwise
@@ -170,7 +170,7 @@ sd_readahead("noreplay");</programlisting>
                 <title>See Also</title>
                 <para>
                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
-                        <citerefentry><refentrytitle>sd_daemon</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>sd-readahead</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>daemon</refentrytitle><manvolnum>7</manvolnum></citerefentry>
                 </para>
         </refsect1>
-- 
2.39.5