From fff80c5a2aba519d1c58a1bfc7c0fa96b1e4c30c Mon Sep 17 00:00:00 2001
From: Lukas Nykryn <lnykryn@redhat.com>
Date: Wed, 19 Nov 2014 12:17:19 +0100
Subject: [PATCH] Revert "readahead: wipe out readahead"
This reverts commit d6bc8348d5be8576a475ac8ced2b0146e60fb71f.
Conflicts:
units/systemd-firstboot.service.in
Conflicts:
man/sd-daemon.xml
man/sd-login.xml
man/systemd-notify.xml
src/notify/notify.c
---
Makefile-man.am | 31 ++
Makefile.am | 54 +-
configure.ac | 9 +
man/sd-daemon.xml | 1 +
man/sd-login.xml | 1 +
man/sd-readahead.xml | 117 +++++
man/sd_readahead.xml | 178 +++++++
man/systemd-notify.xml | 11 +
man/systemd-readahead-replay.service.xml | 203 ++++++++
po/POTFILES.skip | 1 +
shell-completion/zsh/_systemd | 3 +-
src/cryptsetup/cryptsetup-generator.c | 2 +-
src/gpt-auto-generator/gpt-auto-generator.c | 1 +
src/notify/notify.c | 20 +-
src/readahead/Makefile | 1 +
src/readahead/readahead-analyze.c | 146 ++++++
src/readahead/readahead-collect.c | 650 ++++++++++++++++++++++++
src/readahead/readahead-common.c | 398 +++++++++++++++
src/readahead/readahead-common.h | 61 +++
src/readahead/readahead-replay.c | 281 ++++++++++
src/readahead/readahead.c | 163 ++++++
src/readahead/sd-readahead.c | 89 ++++
src/readahead/test-ssd.c | 41 ++
src/systemd/sd-readahead.h | 73 +++
system-preset/90-systemd.preset | 1 +
units/.gitignore | 3 +
units/ldconfig.service | 2 +-
units/quotaon.service.in | 2 +-
units/system-update.target | 2 +-
units/systemd-backlight@.service.in | 2 +-
units/systemd-binfmt.service.in | 2 +-
units/systemd-firstboot.service.in | 2 +-
units/systemd-fsck-root.service.in | 1 +
units/systemd-fsck@.service.in | 2 +-
units/systemd-hwdb-update.service.in | 2 +-
units/systemd-journal-catalog-update.service.in | 2 +-
units/systemd-modules-load.service.in | 1 +
units/systemd-quotacheck.service.in | 2 +-
units/systemd-random-seed.service.in | 2 +-
units/systemd-readahead-collect.service.in | 28 +
units/systemd-readahead-done.service.in | 22 +
units/systemd-readahead-done.timer | 22 +
units/systemd-readahead-drop.service | 19 +
units/systemd-readahead-replay.service.in | 26 +
units/systemd-remount-fs.service.in | 2 +-
units/systemd-rfkill@.service.in | 2 +-
units/systemd-sysctl.service.in | 1 +
units/systemd-sysusers.service.in | 2 +-
units/systemd-tmpfiles-clean.service.in | 2 +-
units/systemd-tmpfiles-setup-dev.service.in | 2 +-
units/systemd-tmpfiles-setup.service.in | 2 +-
units/systemd-update-done.service.in | 2 +-
units/systemd-update-utmp.service.in | 2 +-
units/systemd-vconsole-setup.service.in | 1 +
54 files changed, 2675 insertions(+), 23 deletions(-)
create mode 100644 man/sd-readahead.xml
create mode 100644 man/sd_readahead.xml
create mode 100644 man/systemd-readahead-replay.service.xml
create mode 120000 src/readahead/Makefile
create mode 100644 src/readahead/readahead-analyze.c
create mode 100644 src/readahead/readahead-collect.c
create mode 100644 src/readahead/readahead-common.c
create mode 100644 src/readahead/readahead-common.h
create mode 100644 src/readahead/readahead-replay.c
create mode 100644 src/readahead/readahead.c
create mode 100644 src/readahead/sd-readahead.c
create mode 100644 src/readahead/test-ssd.c
create mode 100644 src/systemd/sd-readahead.h
create mode 100644 units/systemd-readahead-collect.service.in
create mode 100644 units/systemd-readahead-done.service.in
create mode 100644 units/systemd-readahead-done.timer
create mode 100644 units/systemd-readahead-drop.service
create mode 100644 units/systemd-readahead-replay.service.in
diff --git a/Makefile-man.am b/Makefile-man.am
index d0fb9aa..ac6f69a 100644
--- a/Makefile-man.am
+++ b/Makefile-man.am
@@ -1234,6 +1234,34 @@ man/systemd-random-seed.html: man/systemd-random-seed.service.html
endif
+if ENABLE_READAHEAD
+MANPAGES += \
+ man/sd-readahead.3 \
+ man/sd_readahead.3 \
+ man/systemd-readahead-replay.service.8
+MANPAGES_ALIAS += \
+ man/systemd-readahead-collect.service.8 \
+ man/systemd-readahead-done.service.8 \
+ man/systemd-readahead-done.timer.8 \
+ man/systemd-readahead.8
+man/systemd-readahead-collect.service.8: man/systemd-readahead-replay.service.8
+man/systemd-readahead-done.service.8: man/systemd-readahead-replay.service.8
+man/systemd-readahead-done.timer.8: man/systemd-readahead-replay.service.8
+man/systemd-readahead.8: man/systemd-readahead-replay.service.8
+man/systemd-readahead-collect.service.html: man/systemd-readahead-replay.service.html
+ $(html-alias)
+
+man/systemd-readahead-done.service.html: man/systemd-readahead-replay.service.html
+ $(html-alias)
+
+man/systemd-readahead-done.timer.html: man/systemd-readahead-replay.service.html
+ $(html-alias)
+
+man/systemd-readahead.html: man/systemd-readahead-replay.service.html
+ $(html-alias)
+
+endif
+
if ENABLE_RESOLVED
MANPAGES += \
man/resolved.conf.5 \
@@ -1660,6 +1688,7 @@ EXTRA_DIST += \
man/sd-id128.xml \
man/sd-journal.xml \
man/sd-login.xml \
+ man/sd-readahead.xml \
man/sd_booted.xml \
man/sd_bus_creds_get_pid.xml \
man/sd_bus_creds_new_from_pid.xml \
@@ -1707,6 +1736,7 @@ EXTRA_DIST += \
man/sd_machine_get_class.xml \
man/sd_notify.xml \
man/sd_pid_get_session.xml \
+ man/sd_readahead.xml \
man/sd_seat_get_active.xml \
man/sd_session_is_active.xml \
man/sd_uid_get_state.xml \
@@ -1766,6 +1796,7 @@ EXTRA_DIST += \
man/systemd-path.xml \
man/systemd-quotacheck.service.xml \
man/systemd-random-seed.service.xml \
+ man/systemd-readahead-replay.service.xml \
man/systemd-remount-fs.service.xml \
man/systemd-resolved.service.xml \
man/systemd-rfkill@.service.xml \
diff --git a/Makefile.am b/Makefile.am
index 70e4fbc..b0e4b5a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -2603,7 +2603,8 @@ systemctl_LDADD = \
# ------------------------------------------------------------------------------
systemd_notify_SOURCES = \
- src/notify/notify.c
+ src/notify/notify.c \
+ src/readahead/sd-readahead.c
systemd_notify_LDADD = \
libsystemd-internal.la \
@@ -4736,6 +4737,57 @@ EXTRA_DIST += \
units/systemd-vconsole-setup.service.in
# ------------------------------------------------------------------------------
+if ENABLE_READAHEAD
+systemd_readahead_SOURCES = \
+ src/readahead/readahead.c \
+ src/readahead/readahead-collect.c \
+ src/readahead/readahead-replay.c \
+ src/readahead/readahead-analyze.c \
+ src/readahead/readahead-common.c \
+ src/readahead/readahead-common.h
+
+systemd_readahead_LDADD = \
+ libsystemd-internal.la \
+ libudev-internal.la \
+ libsystemd-shared.la
+
+dist_doc_DATA += \
+ src/readahead/sd-readahead.c \
+ src/systemd/sd-readahead.h
+
+rootlibexec_PROGRAMS += \
+ systemd-readahead
+
+dist_systemunit_DATA += \
+ units/systemd-readahead-drop.service \
+ units/systemd-readahead-done.timer
+
+nodist_systemunit_DATA += \
+ units/systemd-readahead-collect.service \
+ units/systemd-readahead-replay.service \
+ units/systemd-readahead-done.service
+
+manual_tests += \
+ test-ssd
+
+test_ssd_SOURCES = \
+ src/readahead/test-ssd.c \
+ src/readahead/readahead-common.c \
+ src/readahead/readahead-common.h
+
+test_ssd_LDADD = \
+ libsystemd-internal.la \
+ libudev-internal.la \
+ libsystemd-shared.la
+
+endif
+
+EXTRA_DIST += \
+ units/systemd-readahead-collect.service.in \
+ units/systemd-readahead-replay.service.in \
+ units/systemd-readahead-done.service.in
+
+# ------------------------------------------------------------------------------
if ENABLE_BOOTCHART
systemd_bootchart_SOURCES = \
src/bootchart/bootchart.c \
diff --git a/configure.ac b/configure.ac
index 3f50887..f701bcf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -931,6 +931,14 @@ fi
AM_CONDITIONAL(ENABLE_VCONSOLE, [test "$have_vconsole" = "yes"])
# ------------------------------------------------------------------------------
+have_readahead=no
+AC_ARG_ENABLE(readahead, AS_HELP_STRING([--disable-readahead], [disable readahead tools]))
+if test "x$enable_readahead" != "xno"; then
+ have_readahead=yes
+fi
+AM_CONDITIONAL(ENABLE_READAHEAD, [test "$have_readahead" = "yes"])
+
+# ------------------------------------------------------------------------------
have_bootchart=no
AC_ARG_ENABLE(bootchart, AS_HELP_STRING([--disable-bootchart], [disable bootchart tool]))
if test "x$enable_bootchart" != "xno"; then
@@ -1474,6 +1482,7 @@ AC_MSG_RESULT([
ELFUTILS: ${have_elfutils}
binfmt: ${have_binfmt}
vconsole: ${have_vconsole}
+ readahead: ${have_readahead}
bootchart: ${have_bootchart}
quotacheck: ${have_quotacheck}
tmpfiles: ${have_tmpfiles}
diff --git a/man/sd-daemon.xml b/man/sd-daemon.xml
index b7ba363..b12abe2 100644
--- a/man/sd-daemon.xml
+++ b/man/sd-daemon.xml
@@ -137,6 +137,7 @@
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>fprintf</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd-readahead</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
</para>
</refsect1>
diff --git a/man/sd-login.xml b/man/sd-login.xml
index 328f711..abcdb99 100644
--- a/man/sd-login.xml
+++ b/man/sd-login.xml
@@ -128,6 +128,7 @@
<citerefentry><refentrytitle>sd_get_seats</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_login_monitor_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd-readahead</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
</para>
</refsect1>
diff --git a/man/sd-readahead.xml b/man/sd-readahead.xml
new file mode 100644
index 0000000..bcc46b2
--- /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 Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="sd-readahead" conditional='ENABLE_READAHEAD'>
+
+ <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>3</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/systemd/plain/src/readahead/sd-readahead.c"/>
+ and <ulink url="http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/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>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>
diff --git a/man/sd_readahead.xml b/man/sd_readahead.xml
new file mode 100644
index 0000000..9827299
--- /dev/null
+++ b/man/sd_readahead.xml
@@ -0,0 +1,178 @@
+<?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 Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="sd_readahead" conditional='ENABLE_READAHEAD'>
+
+ <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>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_readahead</refname>
+ <refpurpose>Control ongoing disk boot-time read-ahead operations</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include "sd-readahead.h"</funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>int <function>sd_readahead</function></funcdef>
+ <paramdef>const char *<parameter>action</parameter></paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+ <para><function>sd_readahead()</function> may be
+ called by programs involved with early boot-up to
+ 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
+ have the desired speed-up effect on the current or
+ future boot-ups.</para>
+
+ <para>The <parameter>action</parameter> should be one
+ of the following strings:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term>cancel</term>
+
+ <listitem><para>Terminates read-ahead
+ data collection, and drops all
+ read-ahead data collected during this
+ boot-up.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>done</term>
+
+ <listitem><para>Terminates read-ahead
+ data collection, but keeps all
+ read-ahead data collected during this
+ boot-up around for use during
+ subsequent boot-ups.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>noreplay</term>
+
+ <listitem><para>Terminates read-ahead
+ replay.</para></listitem>
+ </varlistentry>
+
+ </variablelist>
+
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para>On failure, these calls return a negative
+ errno-style error code. It is generally recommended to
+ ignore the return value of this call.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Notes</title>
+
+ <para>This function is provided by the reference
+ 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>/run/systemd/readahead/</filename> which is
+ then used as flag file to notify the read-ahead
+ subsystem.</para>
+
+ <para>For details about the algorithm check the
+ liberally licensed reference implementation sources:
+ <ulink url="http://cgit.freedesktop.org/systemd/systemd/plain/src/readahead/sd-readahead.c"/>
+ and <ulink
+ url="http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-readahead.h"/></para>
+
+ <para><function>sd_readahead()</function> is
+ 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 this API copy
+ the implementation into their source tree. For more
+ details about the reference implementation, see
+ <citerefentry><refentrytitle>sd-readahead</refentrytitle><manvolnum>3</manvolnum></citerefentry></para>
+
+ <para>If -DDISABLE_SYSTEMD is set during compilation,
+ this function will always return 0 and otherwise
+ become a NOP.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Examples</title>
+
+ <example>
+ <title>Cancelling all read-ahead operations</title>
+
+ <para>During boots where SELinux has to
+ relabel the file system hierarchy, it will
+ create a large amount of disk accesses that
+ are not necessary during normal boots. Hence
+ it is a good idea to disable both read-ahead replay and read-ahead collection.
+ </para>
+
+ <programlisting>sd_readahead("cancel");
+sd_readahead("noreplay");</programlisting>
+ </example>
+
+ </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>daemon</refentrytitle><manvolnum>7</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>
diff --git a/man/systemd-notify.xml b/man/systemd-notify.xml
index 06d5ae5..46ede1a 100644
--- a/man/systemd-notify.xml
+++ b/man/systemd-notify.xml
@@ -127,6 +127,17 @@
<citerefentry><refentrytitle>sd_booted</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem>
</varlistentry>
+ <varlistentry>
+ <term><option>--readahead=</option></term>
+
+ <listitem><para>Controls disk
+ read-ahead operations. The argument
+ must be a string, and either "cancel",
+ "done" or "noreplay". For details
+ about the semantics of this option see
+ <citerefentry><refentrytitle>sd_readahead</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem>
+ </varlistentry>
+
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
</variablelist>
diff --git a/man/systemd-readahead-replay.service.xml b/man/systemd-readahead-replay.service.xml
new file mode 100644
index 0000000..669fe78
--- /dev/null
+++ b/man/systemd-readahead-replay.service.xml
@@ -0,0 +1,203 @@
+<?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 Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="systemd-readahead-replay.service" conditional='ENABLE_READAHEAD'
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>systemd-readahead-replay.service</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>systemd-readahead-replay.service</refentrytitle>
+ <manvolnum>8</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>systemd-readahead-replay.service</refname>
+ <refname>systemd-readahead-collect.service</refname>
+ <refname>systemd-readahead-done.service</refname>
+ <refname>systemd-readahead-done.timer</refname>
+ <refname>systemd-readahead</refname>
+ <refpurpose>Disk read ahead logic</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <para><filename>systemd-readahead-replay.service</filename></para>
+ <para><filename>systemd-readahead-collect.service</filename></para>
+ <para><filename>systemd-readahead-done.service</filename></para>
+ <para><filename>systemd-readahead-done.timer</filename></para>
+ <cmdsynopsis>
+ <command>/usr/lib/systemd/systemd-readahead/systemd-readahead</command>
+ <arg choice="opt" rep="repeat">OPTIONS</arg>
+ <arg choice="plain">COMMAND</arg>
+ <arg choice="opt">DIRECTORY | FILE</arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><filename>systemd-readahead-collect.service</filename>
+ is a service that collects disk usage patterns at boot
+ time. <filename>systemd-readahead-replay.service</filename>
+ is a service that replays this access data collected
+ at the subsequent boot. Since disks tend to be
+ magnitudes slower than RAM, this is intended to improve
+ boot speeds by pre-loading early at boot all data on
+ disk that is known to be read for the complete boot
+ process.</para>
+
+ <para><filename>systemd-readahead-done.service</filename>
+ is executed a short while after boot completed and signals
+ <filename>systemd-readahead-collect.service</filename>
+ to end data collection. On this signal, this service
+ will then sort the collected disk accesses and store
+ information about them in
+ <filename>/.readahead</filename>.</para>
+
+ <para>Normally, both
+ <filename>systemd-readahead-collect.service</filename>
+ and
+ <filename>systemd-readahead-replay.service</filename>
+ are activated at boot so that access patterns from the
+ preceding boot are replayed and new data collected
+ for the subsequent boot. However, on read-only media
+ where the collected data cannot be stored, it might
+ be a good idea to disable
+ <filename>systemd-readahead-collect.service</filename>.</para>
+
+ <para>On rotating media, when replaying disk accesses
+ at early boot,
+ <filename>systemd-readahead-replay.service</filename>
+ will order read requests by their location on disk. On
+ non-rotating media, they will be ordered by their
+ original access timestamp. If the file system supports
+ it,
+ <filename>systemd-readahead-collect.service</filename>
+ will also defragment and rearrange files on disk to
+ optimize subsequent boot times.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Options</title>
+
+ <para><filename>systemd-readahead</filename> understands
+ the following options:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><option>--files-max=</option></term>
+
+ <listitem><para>Maximum number of
+ files to read ahead. Only valid
+ for thes <command>collect</command>
+ command.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--file-size-max=</option></term>
+
+ <listitem><para>Maximum size of files
+ in bytes to read ahead. Only valid
+ for the <command>collect</command>
+ and <command>replay</command>
+ commands.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--timeout=</option></term>
+
+ <listitem><para>Maximum time in microseconds
+ to spend collecting data. Only valid
+ for the <command>collect</command>
+ command.</para></listitem>
+ </varlistentry>
+
+ <xi:include href="standard-options.xml" xpointer="help" />
+ <xi:include href="standard-options.xml" xpointer="version" />
+ </variablelist>
+
+ </refsect1>
+
+ <refsect1>
+ <title>Commands</title>
+
+ <para>The following commands are understood by
+ <filename>systemd-readahead</filename>:</para> <variablelist>
+ <varlistentry>
+ <term><command>collect
+ [<replaceable>DIRECTORY</replaceable>]</command></term>
+ <listitem>
+ <para>Collect read-ahead data on
+ early boot. When terminating, it will
+ write out a pack file to the indicated
+ directory containing the read-ahead
+ data. </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>replay
+ [<replaceable>DIRECTORY</replaceable>]</command></term>
+ <listitem>
+ <para>Perform read-ahead on the
+ specified directory tree.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>analyze
+ [<replaceable>FILE</replaceable>]</command></term>
+ <listitem>
+ <para>Dumps the content of the
+ read-ahead pack file to the
+ terminal. For each file, the
+ output lists approximately how
+ much will be read ahead by
+ the <command>replay</command>
+ command.</para>
+ </listitem>
+ </varlistentry>
+
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index 51254ec..b552029 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -17,5 +17,6 @@ src/hostname/hostnamed.c
src/locale/localed.c
src/core/org.freedesktop.systemd1.policy.in
src/timedate/timedated.c
+units/systemd-readahead-done.service.in
units/user@.service.in
units/debug-shell.service.in
diff --git a/shell-completion/zsh/_systemd b/shell-completion/zsh/_systemd
index 58b1c7b..06f03bd 100644
--- a/shell-completion/zsh/_systemd
+++ b/shell-completion/zsh/_systemd
@@ -63,7 +63,8 @@ case "$service" in
'--ready[Inform the init system about service start-up completion.]' \
'--pid=[Inform the init system about the main PID of the daemon]' \
'--status=[Send a free-form status string for the daemon to the init systemd]' \
- '--booted[Returns 0 if the system was booted up with systemd]'
+ '--booted[Returns 0 if the system was booted up with systemd]' \
+ '--readahead=[Controls disk read-ahead operations]:arguments:(cancel done noreply)'
;;
systemd-tty-ask-password-agent)
_arguments \
diff --git a/src/cryptsetup/cryptsetup-generator.c b/src/cryptsetup/cryptsetup-generator.c
index 05061c0..dfbca87 100644
--- a/src/cryptsetup/cryptsetup-generator.c
+++ b/src/cryptsetup/cryptsetup-generator.c
@@ -111,7 +111,7 @@ static int create_disk(
"Conflicts=umount.target\n"
"BindsTo=dev-mapper-%i.device\n"
"IgnoreOnIsolate=true\n"
- "After=cryptsetup-pre.target\n",
+ "After=systemd-readahead-collect.service systemd-readahead-replay.service cryptsetup-pre.target\n",
f);
if (!nofail)
diff --git a/src/gpt-auto-generator/gpt-auto-generator.c b/src/gpt-auto-generator/gpt-auto-generator.c
index 5c58b58..7d5a6c6 100644
--- a/src/gpt-auto-generator/gpt-auto-generator.c
+++ b/src/gpt-auto-generator/gpt-auto-generator.c
@@ -133,6 +133,7 @@ static int add_cryptsetup(const char *id, const char *what, bool rw, char **devi
"Before=umount.target cryptsetup.target\n"
"After=%s\n"
"IgnoreOnIsolate=true\n"
+ "After=systemd-readahead-collect.service systemd-readahead-replay.service\n\n"
"[Service]\n"
"Type=oneshot\n"
"RemainAfterExit=yes\n"
diff --git a/src/notify/notify.c b/src/notify/notify.c
index f98075d..e4a128b 100644
--- a/src/notify/notify.c
+++ b/src/notify/notify.c
@@ -31,6 +31,7 @@
#include "strv.h"
#include "util.h"
#include "log.h"
+#include "sd-readahead.h"
#include "build.h"
#include "env-util.h"
@@ -38,6 +39,7 @@ static bool arg_ready = false;
static pid_t arg_pid = 0;
static const char *arg_status = NULL;
static bool arg_booted = false;
+static const char *arg_readahead = NULL;
static void help(void) {
printf("%s [OPTIONS...] [VARIABLE=VALUE...]\n\n"
@@ -48,6 +50,7 @@ static void help(void) {
" --pid[=PID] Set main pid of daemon\n"
" --status=TEXT Set status text\n"
" --booted Check if the system was booted up with systemd\n",
+ " --readahead=ACTION Controls read-ahead operations\n",
program_invocation_short_name);
}
@@ -59,6 +62,7 @@ static int parse_argv(int argc, char *argv[]) {
ARG_PID,
ARG_STATUS,
ARG_BOOTED,
+ ARG_READAHEAD
};
static const struct option options[] = {
@@ -68,6 +72,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "pid", optional_argument, NULL, ARG_PID },
{ "status", required_argument, NULL, ARG_STATUS },
{ "booted", no_argument, NULL, ARG_BOOTED },
+ { "readahead", required_argument, NULL, ARG_READAHEAD },
{}
};
@@ -113,6 +118,10 @@ static int parse_argv(int argc, char *argv[]) {
arg_booted = true;
break;
+ case ARG_READAHEAD:
+ arg_readahead = optarg;
+ break;
+
case '?':
return -EINVAL;
@@ -125,7 +134,8 @@ static int parse_argv(int argc, char *argv[]) {
!arg_ready &&
!arg_status &&
!arg_pid &&
- !arg_booted) {
+ !arg_booted &&
+ !arg_readahead) {
help();
return -EINVAL;
}
@@ -150,6 +160,14 @@ int main(int argc, char* argv[]) {
if (arg_booted)
return sd_booted() <= 0;
+ if (arg_readahead) {
+ r = sd_readahead(arg_readahead);
+ if (r < 0) {
+ log_error("Failed to issue read-ahead control command: %s", strerror(-r));
+ goto finish;
+ }
+ }
+
if (arg_ready)
our_env[i++] = (char*) "READY=1";
diff --git a/src/readahead/Makefile b/src/readahead/Makefile
new file mode 120000
index 0000000..d0b0e8e
--- /dev/null
+++ b/src/readahead/Makefile
@@ -0,0 +1 @@
+../Makefile
\ No newline at end of file
diff --git a/src/readahead/readahead-analyze.c b/src/readahead/readahead-analyze.c
new file mode 100644
index 0000000..76db3cb
--- /dev/null
+++ b/src/readahead/readahead-analyze.c
@@ -0,0 +1,146 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2012 Auke Kok <auke-jan.h.kok@intel.com>
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <linux/limits.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+
+#include "readahead-common.h"
+
+int main_analyze(const char *pack_path) {
+ char line[LINE_MAX];
+ _cleanup_fclose_ FILE *pack = NULL;
+ int a;
+ int missing = 0;
+ size_t tsize = 0;
+
+ if (!pack_path)
+ pack_path = "/.readahead";
+
+ pack = fopen(pack_path, "re");
+ if (!pack) {
+ log_error("Pack file missing.");
+ goto fail;
+ }
+
+ if (!fgets(line, sizeof(line), pack)) {
+ log_error("Pack file corrupt.");
+ goto fail;
+ }
+
+ char_array_0(line);
+
+ if (!endswith(line, READAHEAD_PACK_FILE_VERSION)) {
+ log_error("Pack file version incompatible with this parser.");
+ goto fail;
+ }
+
+ if ((a = getc(pack)) == EOF) {
+ log_error("Pack file corrupt.");
+ goto fail;
+ }
+
+ fputs(" pct sections size: path\n"
+ " === ======== ====: ====\n", stdout);
+
+ for (;;) {
+ char path[PATH_MAX];
+ struct stat st;
+ uint64_t inode;
+ int pages = 0;
+ int sections = 0;
+
+ if (!fgets(path, sizeof(path), pack))
+ break; /* done */
+
+ path[strlen(path)-1] = 0;
+
+ if (fread(&inode, sizeof(inode), 1, pack) != 1) {
+ log_error("Pack file corrupt.");
+ goto fail;
+ }
+
+ for (;;) {
+ uint32_t b, c;
+
+ if (fread(&b, sizeof(b), 1, pack) != 1 ||
+ fread(&c, sizeof(c), 1, pack) != 1) {
+ log_error("Pack file corrupt.");
+ goto fail;
+ }
+ if ((b == 0) && (c == 0))
+ break;
+
+ /* Uncomment this to get all the chunks separately
+ printf(" %d: %d %d\n", sections, b, c);
+ */
+
+ pages += (c - b);
+ sections++;
+ }
+
+ if (stat(path, &st) == 0) {
+ off_t size;
+
+ if (sections == 0)
+ size = st.st_size;
+ else
+ size = pages * page_size();
+
+ tsize += size;
+
+ printf(" %4jd%% (%2d) %12jd: %s\n",
+ (intmax_t) (sections && st.st_size ? size * 100 / st.st_size : 100),
+ sections ? sections : 1,
+ (intmax_t) size,
+ path);
+ } else {
+ printf(" %4dp (%2d) %12s: %s (MISSING)\n",
+ sections ? pages : -1,
+ sections ? sections : 1,
+ "???",
+ path);
+ missing++;
+ }
+
+ }
+
+ printf("\nHOST: %s"
+ "TYPE: %c\n"
+ "MISSING: %d\n"
+ "TOTAL: %zu\n",
+ line,
+ a,
+ missing,
+ tsize);
+
+ return EXIT_SUCCESS;
+
+fail:
+ return EXIT_FAILURE;
+}
diff --git a/src/readahead/readahead-collect.c b/src/readahead/readahead-collect.c
new file mode 100644
index 0000000..822a803
--- /dev/null
+++ b/src/readahead/readahead-collect.c
@@ -0,0 +1,650 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ 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 Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <inttypes.h>
+#include <fcntl.h>
+#include <linux/limits.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/select.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <linux/fanotify.h>
+#include <sys/signalfd.h>
+#include <sys/poll.h>
+#include <sys/mman.h>
+#include <linux/fs.h>
+#include <linux/fiemap.h>
+#include <sys/ioctl.h>
+#include <sys/vfs.h>
+#include <getopt.h>
+#include <sys/inotify.h>
+#include <math.h>
+
+#ifdef HAVE_LINUX_BTRFS_H
+#include <linux/btrfs.h>
+#endif
+
+#ifdef HAVE_FANOTIFY_INIT
+#include <sys/fanotify.h>
+#endif
+
+#include "systemd/sd-daemon.h"
+
+#include "missing.h"
+#include "util.h"
+#include "set.h"
+#include "ioprio.h"
+#include "readahead-common.h"
+#include "virt.h"
+
+/* fixme:
+ *
+ * - detect ssd on btrfs/lvm...
+ * - read ahead directories
+ * - gzip?
+ * - remount rw?
+ * - handle files where nothing is in mincore
+ * - does ioprio_set work with fadvise()?
+ */
+
+static ReadaheadShared *shared = NULL;
+static usec_t starttime;
+
+/* Avoid collisions with the NULL pointer */
+#define SECTOR_TO_PTR(s) ULONG_TO_PTR((s)+1)
+#define PTR_TO_SECTOR(p) (PTR_TO_ULONG(p)-1)
+
+static int btrfs_defrag(int fd) {
+ struct btrfs_ioctl_vol_args data = { .fd = fd };
+
+ return ioctl(fd, BTRFS_IOC_DEFRAG, &data);
+}
+
+static int pack_file(FILE *pack, const char *fn, bool on_btrfs) {
+ struct stat st;
+ void *start = MAP_FAILED;
+ uint8_t *vec;
+ uint32_t b, c;
+ uint64_t inode;
+ size_t l, pages;
+ bool mapped;
+ int r = 0, fd = -1, k;
+
+ assert(pack);
+ assert(fn);
+
+ fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW);
+ if (fd < 0) {
+
+ if (errno == ENOENT)
+ return 0;
+
+ if (errno == EPERM || errno == EACCES)
+ return 0;
+
+ log_warning("open(%s) failed: %m", fn);
+ r = -errno;
+ goto finish;
+ }
+
+ k = file_verify(fd, fn, arg_file_size_max, &st);
+ if (k <= 0) {
+ r = k;
+ goto finish;
+ }
+
+ if (on_btrfs)
+ btrfs_defrag(fd);
+
+ l = PAGE_ALIGN(st.st_size);
+ start = mmap(NULL, l, PROT_READ, MAP_SHARED, fd, 0);
+ if (start == MAP_FAILED) {
+ log_warning("mmap(%s) failed: %m", fn);
+ r = -errno;
+ goto finish;
+ }
+
+ pages = l / page_size();
+ vec = alloca0(pages);
+ if (mincore(start, l, vec) < 0) {
+ log_warning("mincore(%s) failed: %m", fn);
+ r = -errno;
+ goto finish;
+ }
+
+ fputs(fn, pack);
+ fputc('\n', pack);
+
+ /* Store the inode, so that we notice when the file is deleted */
+ inode = (uint64_t) st.st_ino;
+ fwrite(&inode, sizeof(inode), 1, pack);
+
+ mapped = false;
+ for (c = 0; c < pages; c++) {
+ bool new_mapped = !!(vec[c] & 1);
+
+ if (!mapped && new_mapped)
+ b = c;
+ else if (mapped && !new_mapped) {
+ fwrite(&b, sizeof(b), 1, pack);
+ fwrite(&c, sizeof(c), 1, pack);
+
+ log_debug("%s: page %u to %u", fn, b, c);
+ }
+
+ mapped = new_mapped;
+ }
+
+ /* We don't write any range data if we should read the entire file */
+ if (mapped && b > 0) {
+ fwrite(&b, sizeof(b), 1, pack);
+ fwrite(&c, sizeof(c), 1, pack);
+
+ log_debug("%s: page %u to %u", fn, b, c);
+ }
+
+ /* End marker */
+ b = 0;
+ fwrite(&b, sizeof(b), 1, pack);
+ fwrite(&b, sizeof(b), 1, pack);
+
+finish:
+ if (start != MAP_FAILED)
+ munmap(start, l);
+
+ safe_close(fd);
+
+ return r;
+}
+
+static unsigned long fd_first_block(int fd) {
+ struct {
+ struct fiemap fiemap;
+ struct fiemap_extent extent;
+ } data = {
+ .fiemap.fm_length = ~0ULL,
+ .fiemap.fm_extent_count = 1,
+ };
+
+ if (ioctl(fd, FS_IOC_FIEMAP, &data) < 0)
+ return 0;
+
+ if (data.fiemap.fm_mapped_extents <= 0)
+ return 0;
+
+ if (data.fiemap.fm_extents[0].fe_flags & FIEMAP_EXTENT_UNKNOWN)
+ return 0;
+
+ return (unsigned long) data.fiemap.fm_extents[0].fe_physical;
+}
+
+struct item {
+ const char *path;
+ unsigned long block;
+ unsigned long bin;
+};
+
+static int qsort_compare(const void *a, const void *b) {
+ const struct item *i, *j;
+
+ i = a;
+ j = b;
+
+ /* sort by bin first */
+ if (i->bin < j->bin)
+ return -1;
+ if (i->bin > j->bin)
+ return 1;
+
+ /* then sort by sector */
+ if (i->block < j->block)
+ return -1;
+ if (i->block > j->block)
+ return 1;
+
+ return strcmp(i->path, j->path);
+}
+
+static int collect(const char *root) {
+ enum {
+ FD_FANOTIFY, /* Get the actual fs events */
+ FD_SIGNAL,
+ FD_INOTIFY, /* We get notifications to quit early via this fd */
+ _FD_MAX
+ };
+ struct pollfd pollfd[_FD_MAX] = {};
+ int fanotify_fd = -1, signal_fd = -1, inotify_fd = -1, r = 0;
+ pid_t my_pid;
+ Hashmap *files = NULL;
+ Iterator i;
+ char *p, *q;
+ sigset_t mask;
+ FILE *pack = NULL;
+ char *pack_fn_new = NULL, *pack_fn = NULL;
+ bool on_ssd, on_btrfs;
+ struct statfs sfs;
+ usec_t not_after;
+ uint64_t previous_block_readahead;
+ bool previous_block_readahead_set = false;
+
+ assert(root);
+
+ if (asprintf(&pack_fn, "%s/.readahead", root) < 0) {
+ r = log_oom();
+ goto finish;
+ }
+
+ starttime = now(CLOCK_MONOTONIC);
+
+ /* If there's no pack file yet we lower the kernel readahead
+ * so that mincore() is accurate. If there is a pack file
+ * already we assume it is accurate enough so that kernel
+ * readahead is never triggered. */
+ previous_block_readahead_set =
+ access(pack_fn, F_OK) < 0 &&
+ block_get_readahead(root, &previous_block_readahead) >= 0 &&
+ block_set_readahead(root, 8*1024) >= 0;
+
+ if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0)) < 0)
+ log_warning("Failed to set IDLE IO priority class: %m");
+
+ assert_se(sigemptyset(&mask) == 0);
+ sigset_add_many(&mask, SIGINT, SIGTERM, -1);
+ assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
+
+ if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
+ log_error("signalfd(): %m");
+ r = -errno;
+ goto finish;
+ }
+
+ files = hashmap_new(&string_hash_ops);
+ if (!files) {
+ log_error("Failed to allocate set.");
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ fanotify_fd = fanotify_init(FAN_CLOEXEC|FAN_NONBLOCK, O_RDONLY|O_LARGEFILE|O_CLOEXEC|O_NOATIME);
+ if (fanotify_fd < 0) {
+ log_error("Failed to create fanotify object: %m");
+ r = -errno;
+ goto finish;
+ }
+
+ if (fanotify_mark(fanotify_fd, FAN_MARK_ADD|FAN_MARK_MOUNT, FAN_OPEN, AT_FDCWD, root) < 0) {
+ log_error("Failed to mark %s: %m", root);
+ r = -errno;
+ goto finish;
+ }
+
+ inotify_fd = open_inotify();
+ if (inotify_fd < 0) {
+ r = inotify_fd;
+ goto finish;
+ }
+
+ not_after = now(CLOCK_MONOTONIC) + arg_timeout;
+
+ my_pid = getpid();
+
+ pollfd[FD_FANOTIFY].fd = fanotify_fd;
+ pollfd[FD_FANOTIFY].events = POLLIN;
+ pollfd[FD_SIGNAL].fd = signal_fd;
+ pollfd[FD_SIGNAL].events = POLLIN;
+ pollfd[FD_INOTIFY].fd = inotify_fd;
+ pollfd[FD_INOTIFY].events = POLLIN;
+
+ sd_notify(0,
+ "READY=1\n"
+ "STATUS=Collecting readahead data");
+
+ log_debug("Collecting...");
+
+ if (access("/run/systemd/readahead/cancel", F_OK) >= 0) {
+ log_debug("Collection canceled");
+ r = -ECANCELED;
+ goto finish;
+ }
+
+ if (access("/run/systemd/readahead/done", F_OK) >= 0) {
+ log_debug("Got termination request");
+ goto done;
+ }
+
+ for (;;) {
+ union {
+ struct fanotify_event_metadata metadata;
+ char buffer[4096];
+ } data;
+ ssize_t n;
+ struct fanotify_event_metadata *m;
+ usec_t t;
+ int h;
+
+ if (hashmap_size(files) > arg_files_max) {
+ log_debug("Reached maximum number of read ahead files, ending collection.");
+ break;
+ }
+
+ t = now(CLOCK_MONOTONIC);
+ if (t >= not_after) {
+ log_debug("Reached maximum collection time, ending collection.");
+ break;
+ }
+
+ if ((h = poll(pollfd, _FD_MAX, (int) ((not_after - t) / USEC_PER_MSEC))) < 0) {
+
+ if (errno == EINTR)
+ continue;
+
+ log_error("poll(): %m");
+ r = -errno;
+ goto finish;
+ }
+
+ if (h == 0) {
+ log_debug("Reached maximum collection time, ending collection.");
+ break;
+ }
+
+ if (pollfd[FD_SIGNAL].revents) {
+ log_debug("Got signal.");
+ break;
+ }
+
+ if (pollfd[FD_INOTIFY].revents) {
+ uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
+ struct inotify_event *e;
+
+ if ((n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer))) < 0) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
+
+ log_error("Failed to read inotify event: %m");
+ r = -errno;
+ goto finish;
+ }
+
+ e = (struct inotify_event*) inotify_buffer;
+ while (n > 0) {
+ size_t step;
+
+ if ((e->mask & IN_CREATE) && streq(e->name, "cancel")) {
+ log_debug("Collection canceled");
+ r = -ECANCELED;
+ goto finish;
+ }
+
+ if ((e->mask & IN_CREATE) && streq(e->name, "done")) {
+ log_debug("Got termination request");
+ goto done;
+ }
+
+ step = sizeof(struct inotify_event) + e->len;
+ assert(step <= (size_t) n);
+
+ e = (struct inotify_event*) ((uint8_t*) e + step);
+ n -= step;
+ }
+ }
+
+ n = read(fanotify_fd, &data, sizeof(data));
+ if (n < 0) {
+
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
+
+ /* fanotify sometimes returns EACCES on read()
+ * where it shouldn't. For now let's just
+ * ignore it here (which is safe), but
+ * eventually this should be
+ * dropped when the kernel is fixed.
+ *
+ * https://bugzilla.redhat.com/show_bug.cgi?id=707577 */
+ if (errno == EACCES)
+ continue;
+
+ log_error("Failed to read event: %m");
+ r = -errno;
+ goto finish;
+ }
+
+ for (m = &data.metadata; FAN_EVENT_OK(m, n); m = FAN_EVENT_NEXT(m, n)) {
+ char fn[sizeof("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
+ int k;
+
+ if (m->fd < 0)
+ goto next_iteration;
+
+ if (m->pid == my_pid)
+ goto next_iteration;
+
+ __sync_synchronize();
+ if (m->pid == shared->replay)
+ goto next_iteration;
+
+ snprintf(fn, sizeof(fn), "/proc/self/fd/%i", m->fd);
+ k = readlink_malloc(fn, &p);
+ if (k >= 0) {
+ if (startswith(p, "/tmp") ||
+ endswith(p, " (deleted)") ||
+ hashmap_get(files, p))
+ /* Not interesting, or
+ * already read */
+ free(p);
+ else {
+ unsigned long ul;
+ usec_t entrytime;
+ struct item *entry;
+
+ entry = new0(struct item, 1);
+ if (!entry) {
+ r = log_oom();
+ goto finish;
+ }
+
+ ul = fd_first_block(m->fd);
+
+ entrytime = now(CLOCK_MONOTONIC);
+
+ entry->block = ul;
+ entry->path = strdup(p);
+ if (!entry->path) {
+ free(entry);
+ r = log_oom();
+ goto finish;
+ }
+ entry->bin = (entrytime - starttime) / 2000000;
+
+ k = hashmap_put(files, p, entry);
+ if (k < 0) {
+ log_warning("hashmap_put() failed: %s", strerror(-k));
+ free(p);
+ }
+ }
+
+ } else
+ log_warning("readlink(%s) failed: %s", fn, strerror(-k));
+
+ next_iteration:
+ safe_close(m->fd);
+ }
+ }
+
+done:
+ fanotify_fd = safe_close(fanotify_fd);
+
+ log_debug("Writing Pack File...");
+
+ on_ssd = fs_on_ssd(root) > 0;
+ log_debug("On SSD: %s", yes_no(on_ssd));
+
+ on_btrfs = statfs(root, &sfs) >= 0 && F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC);
+ log_debug("On btrfs: %s", yes_no(on_btrfs));
+
+ if (asprintf(&pack_fn_new, "%s/.readahead.new", root) < 0) {
+ r = log_oom();
+ goto finish;
+ }
+
+ pack = fopen(pack_fn_new, "we");
+ if (!pack) {
+ log_error("Failed to open pack file: %m");
+ r = -errno;
+ goto finish;
+ }
+
+ fputs(CANONICAL_HOST READAHEAD_PACK_FILE_VERSION, pack);
+ putc(on_ssd ? 'S' : 'R', pack);
+
+ if (on_ssd || on_btrfs) {
+
+ /* On SSD or on btrfs, just write things out in the
+ * order the files were accessed. */
+
+ HASHMAP_FOREACH_KEY(q, p, files, i)
+ pack_file(pack, p, on_btrfs);
+ } else {
+ unsigned n;
+
+ /* On rotating media, order things by the block
+ * numbers */
+
+ log_debug("Ordering...");
+
+ n = hashmap_size(files);
+ if (n) {
+ _cleanup_free_ struct item *ordered;
+ struct item *j;
+ unsigned k;
+
+ ordered = new(struct item, n);
+ if (!ordered) {
+ r = log_oom();
+ goto finish;
+ }
+
+ j = ordered;
+ HASHMAP_FOREACH_KEY(q, p, files, i) {
+ memcpy(j, q, sizeof(struct item));
+ j++;
+ }
+
+ assert(ordered + n == j);
+
+ qsort(ordered, n, sizeof(struct item), qsort_compare);
+
+ for (k = 0; k < n; k++)
+ pack_file(pack, ordered[k].path, on_btrfs);
+ } else
+ log_warning("No pack files");
+ }
+
+ log_debug("Finalizing...");
+
+ fflush(pack);
+
+ if (ferror(pack)) {
+ log_error("Failed to write pack file.");
+ r = -EIO;
+ goto finish;
+ }
+
+ if (rename(pack_fn_new, pack_fn) < 0) {
+ log_error("Failed to rename readahead file: %m");
+ r = -errno;
+ goto finish;
+ }
+
+ fclose(pack);
+ pack = NULL;
+
+ log_debug("Done.");
+
+finish:
+ safe_close(fanotify_fd);
+ safe_close(signal_fd);
+ safe_close(inotify_fd);
+
+ if (pack) {
+ fclose(pack);
+ unlink(pack_fn_new);
+ }
+ free(pack_fn_new);
+ free(pack_fn);
+
+ while ((p = hashmap_steal_first_key(files)))
+ free(p);
+
+ hashmap_free(files);
+
+ if (previous_block_readahead_set) {
+ uint64_t bytes;
+
+ /* Restore the original kernel readahead setting if we
+ * changed it, and nobody has overwritten it since
+ * yet. */
+ if (block_get_readahead(root, &bytes) >= 0 && bytes == 8*1024)
+ block_set_readahead(root, previous_block_readahead);
+ }
+
+ return r;
+}
+
+int main_collect(const char *root) {
+
+ if (!root)
+ root = "/";
+
+ /* Skip this step on read-only media. Note that we check the
+ * underlying block device here, not he read-only flag of the
+ * file system on top, since that one is most likely mounted
+ * read-only anyway at boot, even if the underlying block
+ * device is theoretically writable. */
+ if (fs_on_read_only(root) > 0) {
+ log_info("Disabling readahead collector due to read-only media.");
+ return EXIT_SUCCESS;
+ }
+
+ if (!enough_ram()) {
+ log_info("Disabling readahead collector due to low memory.");
+ return EXIT_SUCCESS;
+ }
+
+ shared = shared_get();
+ if (!shared)
+ return EXIT_FAILURE;
+
+ shared->collect = getpid();
+ __sync_synchronize();
+
+ if (collect(root) < 0)
+ return EXIT_FAILURE;
+
+ return EXIT_SUCCESS;
+}
diff --git a/src/readahead/readahead-common.c b/src/readahead/readahead-common.c
new file mode 100644
index 0000000..3ca48a7
--- /dev/null
+++ b/src/readahead/readahead-common.c
@@ -0,0 +1,398 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ 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 Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/sysinfo.h>
+#include <sys/inotify.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include "log.h"
+#include "readahead-common.h"
+#include "util.h"
+#include "missing.h"
+#include "fileio.h"
+#include "libudev.h"
+#include "udev-util.h"
+
+int file_verify(int fd, const char *fn, off_t file_size_max, struct stat *st) {
+ assert(fd >= 0);
+ assert(fn);
+ assert(st);
+
+ if (fstat(fd, st) < 0) {
+ log_warning("fstat(%s) failed: %m", fn);
+ return -errno;
+ }
+
+ if (!S_ISREG(st->st_mode)) {
+ log_debug("Not preloading special file %s", fn);
+ return 0;
+ }
+
+ if (st->st_size <= 0 || st->st_size > file_size_max) {
+ assert_cc(sizeof(st->st_size) == 8);
+ log_debug("Not preloading file %s with size out of bounds %"PRIu64,
+ fn, st->st_size);
+ return 0;
+ }
+
+ return 1;
+}
+
+int fs_on_ssd(const char *p) {
+ struct stat st;
+ _cleanup_udev_unref_ struct udev *udev = NULL;
+ _cleanup_udev_device_unref_ struct udev_device *udev_device = NULL;
+ struct udev_device *look_at = NULL;
+ const char *devtype, *rotational, *model, *id;
+ int r;
+
+ assert(p);
+
+ if (stat(p, &st) < 0)
+ return -errno;
+
+ if (major(st.st_dev) == 0) {
+ _cleanup_fclose_ FILE *f = NULL;
+ int mount_id;
+ union file_handle_union h = { .handle.handle_bytes = MAX_HANDLE_SZ, };
+
+ /* Might be btrfs, which exposes "ssd" as mount flag if it is on ssd.
+ *
+ * We first determine the mount ID here, if we can,
+ * and then lookup the mount ID in mountinfo to find
+ * the mount options. */
+
+ r = name_to_handle_at(AT_FDCWD, p, &h.handle, &mount_id, AT_SYMLINK_FOLLOW);
+ if (r < 0)
+ return false;
+
+ f = fopen("/proc/self/mountinfo", "re");
+ if (!f)
+ return false;
+
+ for (;;) {
+ char line[LINE_MAX], *e;
+ _cleanup_free_ char *opts = NULL;
+ int mid;
+
+ if (!fgets(line, sizeof(line), f))
+ return false;
+
+ truncate_nl(line);
+
+ if (sscanf(line, "%i", &mid) != 1)
+ continue;
+
+ if (mid != mount_id)
+ continue;
+
+ e = strstr(line, " - ");
+ if (!e)
+ continue;
+
+ if (sscanf(e+3, "%*s %*s %ms", &opts) != 1)
+ continue;
+
+ if (streq(opts, "ssd") || startswith(opts, "ssd,") || endswith(opts, ",ssd") || strstr(opts, ",ssd,"))
+ return true;
+ }
+
+ return false;
+ }
+
+ udev = udev_new();
+ if (!udev)
+ return -ENOMEM;
+
+ udev_device = udev_device_new_from_devnum(udev, 'b', st.st_dev);
+ if (!udev_device)
+ return false;
+
+ devtype = udev_device_get_property_value(udev_device, "DEVTYPE");
+ if (devtype && streq(devtype, "partition"))
+ look_at = udev_device_get_parent(udev_device);
+ else
+ look_at = udev_device;
+
+ if (!look_at)
+ return false;
+
+ /* First, try high-level property */
+ id = udev_device_get_property_value(look_at, "ID_SSD");
+ if (id)
+ return streq(id, "1");
+
+ /* Second, try kernel attribute */
+ rotational = udev_device_get_sysattr_value(look_at, "queue/rotational");
+ if (rotational)
+ return streq(rotational, "0");
+
+ /* Finally, fallback to heuristics */
+ look_at = udev_device_get_parent(look_at);
+ if (!look_at)
+ return false;
+
+ model = udev_device_get_sysattr_value(look_at, "model");
+ if (model)
+ return !!strstr(model, "SSD");
+
+ return false;
+}
+
+int fs_on_read_only(const char *p) {
+ struct stat st;
+ _cleanup_udev_unref_ struct udev *udev = NULL;
+ _cleanup_udev_device_unref_ struct udev_device *udev_device = NULL;
+ const char *read_only;
+
+ assert(p);
+
+ if (stat(p, &st) < 0)
+ return -errno;
+
+ if (major(st.st_dev) == 0)
+ return false;
+
+ udev = udev_new();
+ if (!udev)
+ return -ENOMEM;
+
+ udev_device = udev_device_new_from_devnum(udev, 'b', st.st_dev);
+ if (!udev_device)
+ return false;
+
+ read_only = udev_device_get_sysattr_value(udev_device, "ro");
+ if (read_only)
+ return streq(read_only, "1");
+
+ return false;
+}
+
+bool enough_ram(void) {
+ struct sysinfo si;
+
+ assert_se(sysinfo(&si) >= 0);
+
+ /* Enable readahead only with at least 128MB memory */
+ return si.totalram > 127 * 1024*1024 / si.mem_unit;
+}
+
+static void mkdirs(void) {
+ if (mkdir("/run/systemd", 0755) && errno != EEXIST)
+ log_warning("Failed to create /run/systemd: %m");
+ if (mkdir("/run/systemd/readahead", 0755) && errno != EEXIST)
+ log_warning("Failed to create /run/systemd: %m");
+}
+
+int open_inotify(void) {
+ int fd;
+
+ fd = inotify_init1(IN_CLOEXEC|IN_NONBLOCK);
+ if (fd < 0) {
+ log_error("Failed to create inotify handle: %m");
+ return -errno;
+ }
+
+ mkdirs();
+
+ if (inotify_add_watch(fd, "/run/systemd/readahead", IN_CREATE) < 0) {
+ log_error("Failed to watch /run/systemd/readahead: %m");
+ safe_close(fd);
+ return -errno;
+ }
+
+ return fd;
+}
+
+ReadaheadShared *shared_get(void) {
+ _cleanup_close_ int fd = -1;
+ ReadaheadShared *m = NULL;
+
+ mkdirs();
+
+ fd = open("/run/systemd/readahead/shared", O_CREAT|O_RDWR|O_CLOEXEC, 0644);
+ if (fd < 0) {
+ log_error("Failed to create shared memory segment: %m");
+ return NULL;
+ }
+
+ if (ftruncate(fd, sizeof(ReadaheadShared)) < 0) {
+ log_error("Failed to truncate shared memory segment: %m");
+ return NULL;
+ }
+
+ m = mmap(NULL, sizeof(ReadaheadShared), PROT_WRITE|PROT_READ, MAP_SHARED, fd, 0);
+ if (m == MAP_FAILED) {
+ log_error("Failed to mmap shared memory segment: %m");
+ return NULL;
+ }
+
+ return m;
+}
+
+/* We use 20K instead of the more human digestable 16K here. Why?
+ Simply so that it is more unlikely that users end up picking this
+ value too so that we can recognize better whether the user changed
+ the value while we had it temporarily bumped. */
+#define BUMP_REQUEST_NR (20*1024u)
+
+int block_bump_request_nr(const char *p) {
+ struct stat st;
+ uint64_t u;
+ char *ap = NULL, *line = NULL;
+ int r;
+ dev_t d;
+
+ assert(p);
+
+ if (stat(p, &st) < 0)
+ return -errno;
+
+ if (major(st.st_dev) == 0)
+ return 0;
+
+ d = st.st_dev;
+ block_get_whole_disk(d, &d);
+
+ if (asprintf(&ap, "/sys/dev/block/%u:%u/queue/nr_requests", major(d), minor(d)) < 0) {
+ r= -ENOMEM;
+ goto finish;
+ }
+
+ r = read_one_line_file(ap, &line);
+ if (r < 0) {
+ if (r == -ENOENT)
+ r = 0;
+ goto finish;
+ }
+
+ r = safe_atou64(line, &u);
+ if (r >= 0 && u >= BUMP_REQUEST_NR) {
+ r = 0;
+ goto finish;
+ }
+
+ free(line);
+ line = NULL;
+
+ if (asprintf(&line, "%u", BUMP_REQUEST_NR) < 0) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ r = write_string_file(ap, line);
+ if (r < 0)
+ goto finish;
+
+ log_info("Bumped block_nr parameter of %u:%u to %u. This is a temporary hack and should be removed one day.", major(d), minor(d), BUMP_REQUEST_NR);
+ r = 1;
+
+finish:
+ free(ap);
+ free(line);
+
+ return r;
+}
+
+int block_get_readahead(const char *p, uint64_t *bytes) {
+ struct stat st;
+ char *ap = NULL, *line = NULL;
+ int r;
+ dev_t d;
+ uint64_t u;
+
+ assert(p);
+ assert(bytes);
+
+ if (stat(p, &st) < 0)
+ return -errno;
+
+ if (major(st.st_dev) == 0)
+ return 0;
+
+ d = st.st_dev;
+ block_get_whole_disk(d, &d);
+
+ if (asprintf(&ap, "/sys/dev/block/%u:%u/bdi/read_ahead_kb", major(d), minor(d)) < 0) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ r = read_one_line_file(ap, &line);
+ if (r < 0)
+ goto finish;
+
+ r = safe_atou64(line, &u);
+ if (r < 0)
+ goto finish;
+
+ *bytes = u * 1024ULL;
+
+finish:
+ free(ap);
+ free(line);
+
+ return r;
+}
+
+int block_set_readahead(const char *p, uint64_t bytes) {
+ struct stat st;
+ char *ap = NULL, *line = NULL;
+ int r;
+ dev_t d;
+
+ assert(p);
+ assert(bytes);
+
+ if (stat(p, &st) < 0)
+ return -errno;
+
+ if (major(st.st_dev) == 0)
+ return 0;
+
+ d = st.st_dev;
+ block_get_whole_disk(d, &d);
+
+ if (asprintf(&ap, "/sys/dev/block/%u:%u/bdi/read_ahead_kb", major(d), minor(d)) < 0) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if (asprintf(&line, "%llu", bytes / 1024ULL) < 0) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ r = write_string_file(ap, line);
+ if (r < 0)
+ goto finish;
+
+finish:
+ free(ap);
+ free(line);
+
+ return r;
+}
diff --git a/src/readahead/readahead-common.h b/src/readahead/readahead-common.h
new file mode 100644
index 0000000..b34f3aa
--- /dev/null
+++ b/src/readahead/readahead-common.h
@@ -0,0 +1,61 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+ 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 Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "macro.h"
+#include "util.h"
+
+#define READAHEAD_FILE_SIZE_MAX (10*1024*1024)
+
+#define READAHEAD_PACK_FILE_VERSION ";VERSION=2\n"
+
+extern unsigned arg_files_max;
+extern off_t arg_file_size_max;
+extern usec_t arg_timeout;
+
+int file_verify(int fd, const char *fn, off_t file_size_max, struct stat *st);
+
+int fs_on_ssd(const char *p);
+int fs_on_read_only(const char *p);
+
+bool enough_ram(void);
+
+int open_inotify(void);
+
+typedef struct ReadaheadShared {
+ pid_t collect;
+ pid_t replay;
+} _packed_ ReadaheadShared;
+
+ReadaheadShared *shared_get(void);
+
+int block_bump_request_nr(const char *p);
+
+int block_get_readahead(const char *p, uint64_t *bytes);
+int block_set_readahead(const char *p, uint64_t bytes);
+
+int main_collect(const char *root);
+int main_replay(const char *root);
+int main_analyze(const char *pack_path);
diff --git a/src/readahead/readahead-replay.c b/src/readahead/readahead-replay.c
new file mode 100644
index 0000000..f81e0fe
--- /dev/null
+++ b/src/readahead/readahead-replay.c
@@ -0,0 +1,281 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ 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 Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <inttypes.h>
+#include <fcntl.h>
+#include <linux/limits.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/select.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <sys/inotify.h>
+
+#include "systemd/sd-daemon.h"
+
+#include "missing.h"
+#include "util.h"
+#include "set.h"
+#include "ioprio.h"
+#include "readahead-common.h"
+#include "virt.h"
+
+static ReadaheadShared *shared = NULL;
+
+static int unpack_file(FILE *pack) {
+ _cleanup_close_ int fd = -1;
+ char fn[PATH_MAX];
+ bool any = false;
+ struct stat st;
+ uint64_t inode;
+
+ assert(pack);
+
+ if (!fgets(fn, sizeof(fn), pack))
+ return 0;
+
+ char_array_0(fn);
+ truncate_nl(fn);
+
+ fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW);
+ if (fd < 0) {
+ if (errno != ENOENT && errno != EPERM && errno != EACCES && errno != ELOOP)
+ log_warning("open(%s) failed: %m", fn);
+
+ } else if (file_verify(fd, fn, arg_file_size_max, &st) <= 0)
+ fd = safe_close(fd);
+
+ if (fread(&inode, sizeof(inode), 1, pack) != 1) {
+ log_error("Premature end of pack file.");
+ return -EIO;
+ }
+
+ if (fd >= 0) {
+ /* If the inode changed the file got deleted, so just
+ * ignore this entry */
+ if (st.st_ino != (uint64_t) inode)
+ fd = safe_close(fd);
+ }
+
+ for (;;) {
+ uint32_t b, c;
+
+ if (fread(&b, sizeof(b), 1, pack) != 1 ||
+ fread(&c, sizeof(c), 1, pack) != 1) {
+ log_error("Premature end of pack file.");
+ return -EIO;
+ }
+
+ if (b == 0 && c == 0)
+ break;
+
+ if (c <= b) {
+ log_error("Invalid pack file.");
+ return -EIO;
+ }
+
+ log_debug("%s: page %u to %u", fn, b, c);
+
+ any = true;
+
+ if (fd >= 0) {
+ if (posix_fadvise(fd, b * page_size(), (c - b) * page_size(), POSIX_FADV_WILLNEED) < 0) {
+ log_warning("posix_fadvise() failed: %m");
+ return -errno;
+ }
+ }
+ }
+
+ if (!any && fd >= 0) {
+ /* if no range is encoded in the pack file this is
+ * intended to mean that the whole file shall be
+ * read */
+
+ if (posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED) < 0) {
+ log_warning("posix_fadvise() failed: %m");
+ return -errno;
+ }
+ }
+
+ return 0;
+}
+
+static int replay(const char *root) {
+ _cleanup_close_ int inotify_fd = -1;
+ _cleanup_free_ char *pack_fn = NULL;
+ _cleanup_fclose_ FILE *pack = NULL;
+ bool on_ssd, ready = false;
+ char line[LINE_MAX];
+ int prio, c;
+
+ assert(root);
+
+ block_bump_request_nr(root);
+
+ if (asprintf(&pack_fn, "%s/.readahead", root) < 0)
+ return log_oom();
+
+ pack = fopen(pack_fn, "re");
+ if (!pack) {
+ if (errno == ENOENT) {
+ log_debug("No pack file found.");
+ return 0;
+ }
+
+ log_error("Failed to open pack file: %m");
+ return -errno;
+ }
+
+ posix_fadvise(fileno(pack), 0, 0, POSIX_FADV_WILLNEED);
+
+ inotify_fd = open_inotify();
+ if (inotify_fd < 0)
+ return inotify_fd;
+
+ if (!fgets(line, sizeof(line), pack)) {
+ log_error("Premature end of pack file.");
+ return -EIO;
+ }
+
+ char_array_0(line);
+
+ if (!streq(line, CANONICAL_HOST READAHEAD_PACK_FILE_VERSION)) {
+ log_debug("Pack file host or version type mismatch.");
+ goto done;
+ }
+
+ c = getc(pack);
+ if (c == EOF) {
+ log_debug("Premature end of pack file.");
+ return -EIO;
+ }
+
+ /* We do not retest SSD here, so that we can start replaying
+ * before udev is up.*/
+ on_ssd = c == 'S';
+ log_debug("On SSD: %s", yes_no(on_ssd));
+
+ if (on_ssd)
+ prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0);
+ else
+ /* We are not using RT here, since we'd starve IO that
+ we didn't record (which is for example blkid, since
+ its disk accesses go directly to the block device and
+ are thus not visible in fallocate) to death. However,
+ we do ask for an IO prio that is slightly higher than
+ the default (which is BE. 4) */
+ prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 2);
+
+ if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), prio) < 0)
+ log_warning("Failed to set IDLE IO priority class: %m");
+
+ sd_notify(0, "STATUS=Replaying readahead data");
+
+ log_debug("Replaying...");
+
+ if (access("/run/systemd/readahead/noreplay", F_OK) >= 0) {
+ log_debug("Got termination request");
+ goto done;
+ }
+
+ while (!feof(pack) && !ferror(pack)) {
+ uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
+ int k;
+ ssize_t n;
+
+ n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer));
+ if (n < 0) {
+ if (errno != EINTR && errno != EAGAIN) {
+ log_error("Failed to read inotify event: %m");
+ return -errno;
+ }
+ } else {
+ struct inotify_event *e = (struct inotify_event*) inotify_buffer;
+
+ while (n > 0) {
+ size_t step;
+
+ if ((e->mask & IN_CREATE) && streq(e->name, "noreplay")) {
+ log_debug("Got termination request");
+ goto done;
+ }
+
+ step = sizeof(struct inotify_event) + e->len;
+ assert(step <= (size_t) n);
+
+ e = (struct inotify_event*) ((uint8_t*) e + step);
+ n -= step;
+ }
+ }
+
+ k = unpack_file(pack);
+ if (k < 0)
+ return k;
+
+ if (!ready) {
+ /* We delay the ready notification until we
+ * queued at least one read */
+ sd_notify(0, "READY=1");
+ ready = true;
+ }
+ }
+
+done:
+ if (ferror(pack)) {
+ log_error("Failed to read pack file.");
+ return -EIO;
+ }
+
+ if (!ready)
+ sd_notify(0, "READY=1");
+
+ log_debug("Done.");
+ return 0;
+}
+
+int main_replay(const char *root) {
+
+ if (!root)
+ root = "/";
+
+ if (!enough_ram()) {
+ log_info("Disabling readahead replay due to low memory.");
+ return EXIT_SUCCESS;
+ }
+
+ shared = shared_get();
+ if (!shared)
+ return EXIT_FAILURE;
+
+ shared->replay = getpid();
+ __sync_synchronize();
+
+ if (replay(root) < 0)
+ return EXIT_FAILURE;
+
+ return EXIT_SUCCESS;
+}
diff --git a/src/readahead/readahead.c b/src/readahead/readahead.c
new file mode 100644
index 0000000..35176e9
--- /dev/null
+++ b/src/readahead/readahead.c
@@ -0,0 +1,163 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2012 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdio.h>
+#include <getopt.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+#include "util.h"
+#include "def.h"
+#include "build.h"
+#include "readahead-common.h"
+
+unsigned arg_files_max = 16*1024;
+off_t arg_file_size_max = READAHEAD_FILE_SIZE_MAX;
+usec_t arg_timeout = 2*USEC_PER_MINUTE;
+
+static void help(void) {
+ printf("%1$s [OPTIONS...] collect [DIRECTORY]\n\n"
+ "Collect read-ahead data on early boot.\n\n"
+ " -h --help Show this help\n"
+ " --version Show package version\n"
+ " --files-max=INT Maximum number of files to read ahead\n"
+ " --file-size-max=BYTES Maximum size of files to read ahead\n"
+ " --timeout=USEC Maximum time to spend collecting data\n"
+ "\n\n"
+ "%1$s [OPTIONS...] replay [DIRECTORY]\n\n"
+ "Replay collected read-ahead data on early boot.\n\n"
+ " -h --help Show this help\n"
+ " --version Show package version\n"
+ " --file-size-max=BYTES Maximum size of files to read ahead\n"
+ "\n\n"
+ "%1$s [OPTIONS...] analyze [PACK-FILE]\n\n"
+ "Analyze collected read-ahead data.\n\n"
+ " -h --help Show this help\n"
+ " --version Show package version\n",
+ program_invocation_short_name);
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+ enum {
+ ARG_VERSION = 0x100,
+ ARG_FILES_MAX,
+ ARG_FILE_SIZE_MAX,
+ ARG_TIMEOUT
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, ARG_VERSION },
+ { "files-max", required_argument, NULL, ARG_FILES_MAX },
+ { "file-size-max", required_argument, NULL, ARG_FILE_SIZE_MAX },
+ { "timeout", required_argument, NULL, ARG_TIMEOUT },
+ {}
+ };
+
+ int c;
+
+ assert(argc >= 0);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
+
+ switch (c) {
+
+ case 'h':
+ help();
+ return 0;
+
+ case ARG_VERSION:
+ puts(PACKAGE_STRING);
+ puts(SYSTEMD_FEATURES);
+ return 0;
+
+ case ARG_FILES_MAX:
+ if (safe_atou(optarg, &arg_files_max) < 0 || arg_files_max <= 0) {
+ log_error("Failed to parse maximum number of files %s.", optarg);
+ return -EINVAL;
+ }
+ break;
+
+ case ARG_FILE_SIZE_MAX: {
+ unsigned long long ull;
+
+ if (safe_atollu(optarg, &ull) < 0 || ull <= 0) {
+ log_error("Failed to parse maximum file size %s.", optarg);
+ return -EINVAL;
+ }
+
+ arg_file_size_max = (off_t) ull;
+ break;
+ }
+
+ case ARG_TIMEOUT:
+ if (parse_sec(optarg, &arg_timeout) < 0 || arg_timeout <= 0) {
+ log_error("Failed to parse timeout %s.", optarg);
+ return -EINVAL;
+ }
+
+ break;
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached("Unhandled option");
+ }
+
+ if (optind != argc-1 &&
+ optind != argc-2) {
+ log_error("%s: wrong number of arguments.",
+ program_invocation_short_name);
+ return -EINVAL;
+ }
+
+ return 1;
+}
+
+int main(int argc, char *argv[]) {
+ int r;
+
+ log_set_target(LOG_TARGET_SAFE);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+
+ if (streq(argv[optind], "collect"))
+ return main_collect(argv[optind+1]);
+ else if (streq(argv[optind], "replay"))
+ return main_replay(argv[optind+1]);
+ else if (streq(argv[optind], "analyze"))
+ return main_analyze(argv[optind+1]);
+
+ log_error("Unknown verb %s.", argv[optind]);
+ return EXIT_FAILURE;
+}
diff --git a/src/readahead/sd-readahead.c b/src/readahead/sd-readahead.c
new file mode 100644
index 0000000..675d82c
--- /dev/null
+++ b/src/readahead/sd-readahead.c
@@ -0,0 +1,89 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ Copyright 2010 Lennart Poettering
+
+ Permission is hereby granted, free of charge, to any person
+ obtaining a copy of this software and associated documentation files
+ (the "Software"), to deal in the Software without restriction,
+ including without limitation the rights to use, copy, modify, merge,
+ publish, distribute, sublicense, and/or sell copies of the Software,
+ and to permit persons to whom the Software is furnished to do so,
+ subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.
+***/
+
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
+
+#include <unistd.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <string.h>
+
+#include "sd-readahead.h"
+
+#if (__GNUC__ >= 4)
+# ifdef SD_EXPORT_SYMBOLS
+/* Export symbols */
+# define _sd_export_ __attribute__ ((visibility("default")))
+# else
+/* Don't export the symbols */
+# define _sd_export_ __attribute__ ((visibility("hidden")))
+# endif
+#else
+# define _sd_export_
+#endif
+
+static int touch(const char *path) {
+
+#if !defined(DISABLE_SYSTEMD) && defined(__linux__)
+ int fd;
+
+ mkdir("/run/systemd", 0755);
+ mkdir("/run/systemd/readahead", 0755);
+
+ fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0666);
+ if (fd < 0)
+ return -errno;
+
+ for (;;) {
+ if (close(fd) >= 0)
+ break;
+
+ if (errno != EINTR)
+ return -errno;
+ }
+
+#endif
+ return 0;
+}
+
+_sd_export_ int sd_readahead(const char *action) {
+
+ if (!action)
+ return -EINVAL;
+
+ if (strcmp(action, "cancel") == 0)
+ return touch("/run/systemd/readahead/cancel");
+ else if (strcmp(action, "done") == 0)
+ return touch("/run/systemd/readahead/done");
+ else if (strcmp(action, "noreplay") == 0)
+ return touch("/run/systemd/readahead/noreplay");
+
+ return -EINVAL;
+}
diff --git a/src/readahead/test-ssd.c b/src/readahead/test-ssd.c
new file mode 100644
index 0000000..808faf3
--- /dev/null
+++ b/src/readahead/test-ssd.c
@@ -0,0 +1,41 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2014 Zbigniew Jędrzejewski-Szmek
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "readahead-common.h"
+
+int main(int argc, char *argv[]) {
+ int i;
+
+ for (i = 1; i < argc; i++) {
+ char *name = argv[i];
+ int r;
+
+ r = fs_on_ssd(name);
+ if (r < 0) {
+ log_error("%s: %s", name, strerror(-r));
+ return EXIT_FAILURE;
+ }
+
+ log_info("%s: %s", name, r ? "SSD" : "---");
+ }
+
+ return EXIT_SUCCESS;
+}
diff --git a/src/systemd/sd-readahead.h b/src/systemd/sd-readahead.h
new file mode 100644
index 0000000..bb30f9a
--- /dev/null
+++ b/src/systemd/sd-readahead.h
@@ -0,0 +1,73 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#ifndef foosdreadaheadhfoo
+#define foosdreadaheadhfoo
+
+/***
+ Copyright 2010 Lennart Poettering
+
+ Permission is hereby granted, free of charge, to any person
+ obtaining a copy of this software and associated documentation files
+ (the "Software"), to deal in the Software without restriction,
+ including without limitation the rights to use, copy, modify, merge,
+ publish, distribute, sublicense, and/or sell copies of the Software,
+ and to permit persons to whom the Software is furnished to do so,
+ subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.
+***/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ Reference implementation of a few boot read-ahead-related
+ interfaces. These interfaces are trivial to implement. To simplify
+ porting, we provide this reference implementation. Applications are
+ welcome to reimplement the algorithms described here if they do not
+ want to include these two source files.
+
+ You may compile this with -DDISABLE_SYSTEMD to disable systemd
+ support. This makes all calls NOPs.
+
+ Because this is drop-in code, we don't want any of our symbols to be
+ exported in any case. Hence, we declare hidden visibility for all of
+ them.
+
+ You may find an up-to-date version of these source files online:
+
+ http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-readahead.h
+ http://cgit.freedesktop.org/systemd/systemd/plain/src/readahead/sd-readahead.c
+
+ This should compile on non-Linux systems too, but all functions
+ will become NOPs.
+
+ See sd-readahead(3) for more information.
+*/
+
+/*
+ Controls on-going disk read-ahead operations during boot-up. The argument
+ must be one of the following strings: "cancel", "done", or "noreplay".
+
+ cancel = terminate read-ahead data collection, and drop collected information
+ done = terminate read-ahead data collection, and keep collected information
+ noreplay = terminate read-ahead replay
+*/
+int sd_readahead(const char *action);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/system-preset/90-systemd.preset b/system-preset/90-systemd.preset
index ee1b864..24963f0 100644
--- a/system-preset/90-systemd.preset
+++ b/system-preset/90-systemd.preset
@@ -12,6 +12,7 @@ enable remote-fs.target
enable machines.target
enable getty@.service
+enable systemd-readahead-*
enable systemd-timesyncd.service
enable systemd-networkd.service
enable systemd-resolved.service
diff --git a/units/.gitignore b/units/.gitignore
index 6fdb629..638a7ab 100644
--- a/units/.gitignore
+++ b/units/.gitignore
@@ -52,6 +52,9 @@
/systemd-poweroff.service
/systemd-quotacheck.service
/systemd-random-seed.service
+/systemd-readahead-collect.service
+/systemd-readahead-done.service
+/systemd-readahead-replay.service
/systemd-reboot.service
/systemd-remount-fs.service
/systemd-resolved.service
diff --git a/units/ldconfig.service b/units/ldconfig.service
index f9691e2..43c145b 100644
--- a/units/ldconfig.service
+++ b/units/ldconfig.service
@@ -10,7 +10,7 @@ Description=Rebuild Dynamic Linker Cache
Documentation=man:ldconfig(8)
DefaultDependencies=no
Conflicts=shutdown.target
-After=systemd-remount-fs.service
+After=systemd-readahead-collect.service systemd-readahead-replay.service systemd-remount-fs.service
Before=sysinit.target shutdown.target systemd-update-done.service
ConditionNeedsUpdate=/etc
diff --git a/units/quotaon.service.in b/units/quotaon.service.in
index 7d59a40..49a50a7 100644
--- a/units/quotaon.service.in
+++ b/units/quotaon.service.in
@@ -9,7 +9,7 @@
Description=Enable File System Quotas
Documentation=man:quotaon(8)
DefaultDependencies=no
-After=systemd-quotacheck.service
+After=systemd-readahead-collect.service systemd-readahead-replay.service systemd-quotacheck.service
Before=local-fs.target shutdown.target
ConditionPathExists=@QUOTAON@
diff --git a/units/system-update.target b/units/system-update.target
index 48d46fc..d0f847f 100644
--- a/units/system-update.target
+++ b/units/system-update.target
@@ -10,7 +10,7 @@ Description=System Update
Documentation=http://freedesktop.org/wiki/Software/systemd/SystemUpdates
Documentation=man:systemd.special(7) man:systemd-system-update-generator(8)
Requires=sysinit.target
-Conflicts=shutdown.target
+Conflicts=shutdown.target systemd-readahead-collect.service systemd-readahead-replay.service
After=sysinit.target
Before=shutdown.target
AllowIsolate=yes
diff --git a/units/systemd-backlight@.service.in b/units/systemd-backlight@.service.in
index 5e6706c..b146e30 100644
--- a/units/systemd-backlight@.service.in
+++ b/units/systemd-backlight@.service.in
@@ -11,7 +11,7 @@ Documentation=man:systemd-backlight@.service(8)
DefaultDependencies=no
RequiresMountsFor=/var/lib/systemd/backlight
Conflicts=shutdown.target
-After=systemd-remount-fs.service
+After=systemd-readahead-collect.service systemd-readahead-replay.service systemd-remount-fs.service
Before=sysinit.target shutdown.target
[Service]
diff --git a/units/systemd-binfmt.service.in b/units/systemd-binfmt.service.in
index 34a5d52..02dfe77 100644
--- a/units/systemd-binfmt.service.in
+++ b/units/systemd-binfmt.service.in
@@ -11,7 +11,7 @@ Documentation=man:systemd-binfmt.service(8) man:binfmt.d(5)
Documentation=https://www.kernel.org/doc/Documentation/binfmt_misc.txt
DefaultDependencies=no
Conflicts=shutdown.target
-After=proc-sys-fs-binfmt_misc.automount
+After=systemd-readahead-collect.service systemd-readahead-replay.service proc-sys-fs-binfmt_misc.automount
Before=sysinit.target shutdown.target
ConditionPathIsReadWrite=/proc/sys/
ConditionDirectoryNotEmpty=|/lib/binfmt.d
diff --git a/units/systemd-firstboot.service.in b/units/systemd-firstboot.service.in
index 405c6f3..89fa7e1 100644
--- a/units/systemd-firstboot.service.in
+++ b/units/systemd-firstboot.service.in
@@ -10,7 +10,7 @@ Description=First Boot Wizard
Documentation=man:systemd-firstboot(1)
DefaultDependencies=no
Conflicts=shutdown.target
-After=systemd-remount-fs.service
+After=systemd-readahead-collect.service systemd-readahead-replay.service systemd-remount-fs.service
Before=systemd-sysusers.service sysinit.target shutdown.target
ConditionPathIsReadWrite=/etc
ConditionFirstBoot=yes
diff --git a/units/systemd-fsck-root.service.in b/units/systemd-fsck-root.service.in
index 6d76578..26cce51 100644
--- a/units/systemd-fsck-root.service.in
+++ b/units/systemd-fsck-root.service.in
@@ -9,6 +9,7 @@
Description=File System Check on Root Device
Documentation=man:systemd-fsck-root.service(8)
DefaultDependencies=no
+After=systemd-readahead-collect.service systemd-readahead-replay.service
Before=local-fs.target shutdown.target
ConditionPathIsReadWrite=!/
diff --git a/units/systemd-fsck@.service.in b/units/systemd-fsck@.service.in
index 857e625..d2cda6a 100644
--- a/units/systemd-fsck@.service.in
+++ b/units/systemd-fsck@.service.in
@@ -10,7 +10,7 @@ Description=File System Check on %f
Documentation=man:systemd-fsck@.service(8)
DefaultDependencies=no
BindsTo=%i.device
-After=%i.device systemd-fsck-root.service local-fs-pre.target
+After=systemd-readahead-collect.service systemd-readahead-replay.service %i.device systemd-fsck-root.service local-fs-pre.target
Before=shutdown.target
[Service]
diff --git a/units/systemd-hwdb-update.service.in b/units/systemd-hwdb-update.service.in
index 791528e..4bed482 100644
--- a/units/systemd-hwdb-update.service.in
+++ b/units/systemd-hwdb-update.service.in
@@ -10,7 +10,7 @@ Description=Rebuild Hardware Database
Documentation=man:hwdb(7) man:systemd-hwdb(8)
DefaultDependencies=no
Conflicts=shutdown.target
-After=systemd-remount-fs.service
+After=systemd-readahead-collect.service systemd-readahead-replay.service systemd-remount-fs.service
Before=sysinit.target shutdown.target systemd-update-done.service
ConditionNeedsUpdate=/etc
ConditionPathExists=|!@udevlibexecdir@/hwdb.bin
diff --git a/units/systemd-journal-catalog-update.service.in b/units/systemd-journal-catalog-update.service.in
index 6370dd4..5b85889 100644
--- a/units/systemd-journal-catalog-update.service.in
+++ b/units/systemd-journal-catalog-update.service.in
@@ -10,7 +10,7 @@ Description=Rebuild Journal Catalog
Documentation=man:systemd-journald.service(8) man:journald.conf(5)
DefaultDependencies=no
Conflicts=shutdown.target
-After=local-fs.target
+After=systemd-readahead-collect.service systemd-readahead-replay.service local-fs.target
Before=sysinit.target shutdown.target systemd-update-done.service
ConditionNeedsUpdate=/etc
diff --git a/units/systemd-modules-load.service.in b/units/systemd-modules-load.service.in
index 040a0fe..32deb52 100644
--- a/units/systemd-modules-load.service.in
+++ b/units/systemd-modules-load.service.in
@@ -10,6 +10,7 @@ Description=Load Kernel Modules
Documentation=man:systemd-modules-load.service(8) man:modules-load.d(5)
DefaultDependencies=no
Conflicts=shutdown.target
+After=systemd-readahead-collect.service systemd-readahead-replay.service
Before=sysinit.target shutdown.target
ConditionCapability=CAP_SYS_MODULE
ConditionDirectoryNotEmpty=|/lib/modules-load.d
diff --git a/units/systemd-quotacheck.service.in b/units/systemd-quotacheck.service.in
index 5cb9bc3..f726ea1 100644
--- a/units/systemd-quotacheck.service.in
+++ b/units/systemd-quotacheck.service.in
@@ -9,7 +9,7 @@
Description=File System Quota Check
Documentation=man:systemd-quotacheck.service(8)
DefaultDependencies=no
-After=systemd-remount-fs.service
+After=systemd-readahead-collect.service systemd-readahead-replay.service systemd-remount-fs.service
Before=local-fs.target shutdown.target
ConditionPathExists=@QUOTACHECK@
diff --git a/units/systemd-random-seed.service.in b/units/systemd-random-seed.service.in
index b55844b..1879b2f 100644
--- a/units/systemd-random-seed.service.in
+++ b/units/systemd-random-seed.service.in
@@ -11,7 +11,7 @@ Documentation=man:systemd-random-seed.service(8) man:random(4)
DefaultDependencies=no
RequiresMountsFor=@RANDOM_SEED@
Conflicts=shutdown.target
-After=systemd-remount-fs.service
+After=systemd-readahead-collect.service systemd-readahead-replay.service systemd-remount-fs.service
Before=sysinit.target shutdown.target
[Service]
diff --git a/units/systemd-readahead-collect.service.in b/units/systemd-readahead-collect.service.in
new file mode 100644
index 0000000..d4b8e67
--- /dev/null
+++ b/units/systemd-readahead-collect.service.in
@@ -0,0 +1,28 @@
+# This file is part of systemd.
+#
+# systemd is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+
+[Unit]
+Description=Collect Read-Ahead Data
+Documentation=man:systemd-readahead-replay.service(8)
+DefaultDependencies=no
+Wants=systemd-readahead-done.timer
+Conflicts=shutdown.target
+Before=sysinit.target shutdown.target
+ConditionPathExists=!/run/systemd/readahead/cancel
+ConditionPathExists=!/run/systemd/readahead/done
+ConditionVirtualization=no
+
+[Service]
+Type=notify
+ExecStart=@rootlibexecdir@/systemd-readahead collect
+RemainAfterExit=yes
+StandardOutput=null
+OOMScoreAdjust=1000
+
+[Install]
+WantedBy=default.target
+Also=systemd-readahead-drop.service
diff --git a/units/systemd-readahead-done.service.in b/units/systemd-readahead-done.service.in
new file mode 100644
index 0000000..e0d9579
--- /dev/null
+++ b/units/systemd-readahead-done.service.in
@@ -0,0 +1,22 @@
+# This file is part of systemd.
+#
+# systemd is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+
+[Unit]
+Description=Stop Read-Ahead Data Collection
+Documentation=man:systemd-readahead-replay.service(8)
+DefaultDependencies=no
+Conflicts=shutdown.target
+After=default.target
+Before=shutdown.target
+ConditionVirtualization=no
+
+[Service]
+Type=oneshot
+ExecStart=@SYSTEMD_NOTIFY@ --readahead=done
+
+[Install]
+Also=systemd-readahead-collect.service
diff --git a/units/systemd-readahead-done.timer b/units/systemd-readahead-done.timer
new file mode 100644
index 0000000..c58e096
--- /dev/null
+++ b/units/systemd-readahead-done.timer
@@ -0,0 +1,22 @@
+# This file is part of systemd.
+#
+# systemd is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+
+[Unit]
+Description=Stop Read-Ahead Data Collection 10s After Completed Startup
+Documentation=man:systemd-readahead-replay.service(8)
+DefaultDependencies=no
+Conflicts=shutdown.target
+After=default.target
+Before=shutdown.target
+ConditionVirtualization=no
+
+[Timer]
+OnActiveSec=30s
+AccuracySec=1s
+
+[Install]
+Also=systemd-readahead-collect.service
diff --git a/units/systemd-readahead-drop.service b/units/systemd-readahead-drop.service
new file mode 100644
index 0000000..d9d12bc
--- /dev/null
+++ b/units/systemd-readahead-drop.service
@@ -0,0 +1,19 @@
+# This file is part of systemd.
+#
+# systemd is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+
+[Unit]
+Description=Drop Read-Ahead Data
+Documentation=man:systemd-readahead-replay.service(8)
+ConditionPathExists=/.readahead
+
+[Service]
+Type=oneshot
+ExecStart=/bin/rm -f /.readahead
+
+[Install]
+WantedBy=system-update.target
+Also=systemd-readahead-collect.service
diff --git a/units/systemd-readahead-replay.service.in b/units/systemd-readahead-replay.service.in
new file mode 100644
index 0000000..c64a533
--- /dev/null
+++ b/units/systemd-readahead-replay.service.in
@@ -0,0 +1,26 @@
+# This file is part of systemd.
+#
+# systemd is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+
+[Unit]
+Description=Replay Read-Ahead Data
+Documentation=man:systemd-readahead-replay.service(8)
+DefaultDependencies=no
+Conflicts=shutdown.target
+Before=sysinit.target shutdown.target
+ConditionPathExists=!/run/systemd/readahead/noreplay
+ConditionPathExists=/.readahead
+ConditionVirtualization=no
+
+[Service]
+Type=notify
+ExecStart=@rootlibexecdir@/systemd-readahead replay
+RemainAfterExit=yes
+StandardOutput=null
+OOMScoreAdjust=1000
+
+[Install]
+WantedBy=default.target
diff --git a/units/systemd-remount-fs.service.in b/units/systemd-remount-fs.service.in
index 8d9daac..70e1a86 100644
--- a/units/systemd-remount-fs.service.in
+++ b/units/systemd-remount-fs.service.in
@@ -11,7 +11,7 @@ Documentation=man:systemd-remount-fs.service(8)
Documentation=http://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
DefaultDependencies=no
Conflicts=shutdown.target
-After=systemd-fsck-root.service
+After=systemd-readahead-collect.service systemd-readahead-replay.service systemd-fsck-root.service
Before=local-fs-pre.target local-fs.target shutdown.target
Wants=local-fs-pre.target
ConditionPathExists=/etc/fstab
diff --git a/units/systemd-rfkill@.service.in b/units/systemd-rfkill@.service.in
index b48efe5..0d2757d 100644
--- a/units/systemd-rfkill@.service.in
+++ b/units/systemd-rfkill@.service.in
@@ -12,7 +12,7 @@ DefaultDependencies=no
BindsTo=sys-subsystem-rfkill-devices-%i.device
RequiresMountsFor=/var/lib/systemd/rfkill
Conflicts=shutdown.target
-After=systemd-remount-fs.service
+After=systemd-readahead-collect.service systemd-readahead-replay.service systemd-remount-fs.service
Before=sysinit.target shutdown.target
[Service]
diff --git a/units/systemd-sysctl.service.in b/units/systemd-sysctl.service.in
index fa72085..ade9dc3 100644
--- a/units/systemd-sysctl.service.in
+++ b/units/systemd-sysctl.service.in
@@ -10,6 +10,7 @@ Description=Apply Kernel Variables
Documentation=man:systemd-sysctl.service(8) man:sysctl.d(5)
DefaultDependencies=no
Conflicts=shutdown.target
+After=systemd-readahead-collect.service systemd-readahead-replay.service
After=systemd-modules-load.service
Before=sysinit.target shutdown.target
ConditionPathIsReadWrite=/proc/sys/
diff --git a/units/systemd-sysusers.service.in b/units/systemd-sysusers.service.in
index ffd6d77..69fea11 100644
--- a/units/systemd-sysusers.service.in
+++ b/units/systemd-sysusers.service.in
@@ -10,7 +10,7 @@ Description=Create System Users
Documentation=man:sysusers.d(5) man:systemd-sysusers.service(8)
DefaultDependencies=no
Conflicts=shutdown.target
-After=systemd-remount-fs.service
+After=systemd-readahead-collect.service systemd-readahead-replay.service systemd-remount-fs.service
Before=sysinit.target shutdown.target systemd-update-done.service
ConditionNeedsUpdate=/etc
diff --git a/units/systemd-tmpfiles-clean.service.in b/units/systemd-tmpfiles-clean.service.in
index 133c8c9..31b2378 100644
--- a/units/systemd-tmpfiles-clean.service.in
+++ b/units/systemd-tmpfiles-clean.service.in
@@ -10,7 +10,7 @@ Description=Cleanup of Temporary Directories
Documentation=man:tmpfiles.d(5) man:systemd-tmpfiles(8)
DefaultDependencies=no
Conflicts=shutdown.target
-After=local-fs.target time-sync.target
+After=systemd-readahead-collect.service systemd-readahead-replay.service local-fs.target time-sync.target
Before=shutdown.target
[Service]
diff --git a/units/systemd-tmpfiles-setup-dev.service.in b/units/systemd-tmpfiles-setup-dev.service.in
index 0123a03..0b66c53 100644
--- a/units/systemd-tmpfiles-setup-dev.service.in
+++ b/units/systemd-tmpfiles-setup-dev.service.in
@@ -10,7 +10,7 @@ Description=Create Static Device Nodes in /dev
Documentation=man:tmpfiles.d(5) man:systemd-tmpfiles(8)
DefaultDependencies=no
Conflicts=shutdown.target
-After=systemd-sysusers.service
+After=systemd-readahead-collect.service systemd-readahead-replay.service systemd-sysusers.service
Before=sysinit.target local-fs-pre.target systemd-udevd.service shutdown.target
ConditionCapability=CAP_SYS_MODULE
diff --git a/units/systemd-tmpfiles-setup.service.in b/units/systemd-tmpfiles-setup.service.in
index e895cda..72ab083 100644
--- a/units/systemd-tmpfiles-setup.service.in
+++ b/units/systemd-tmpfiles-setup.service.in
@@ -10,7 +10,7 @@ Description=Create Volatile Files and Directories
Documentation=man:tmpfiles.d(5) man:systemd-tmpfiles(8)
DefaultDependencies=no
Conflicts=shutdown.target
-After=local-fs.target systemd-sysusers.service
+After=systemd-readahead-collect.service systemd-readahead-replay.service local-fs.target systemd-sysusers.service
Before=sysinit.target shutdown.target
RefuseManualStop=yes
diff --git a/units/systemd-update-done.service.in b/units/systemd-update-done.service.in
index ec7d906..7031bff 100644
--- a/units/systemd-update-done.service.in
+++ b/units/systemd-update-done.service.in
@@ -10,7 +10,7 @@ Description=Update is Completed
Documentation=man:systemd-update-done.service(8)
DefaultDependencies=no
Conflicts=shutdown.target
-After=local-fs.target
+After=systemd-readahead-collect.service systemd-readahead-replay.service local-fs.target
Before=sysinit.target shutdown.target
ConditionNeedsUpdate=|/etc
ConditionNeedsUpdate=|/var
diff --git a/units/systemd-update-utmp.service.in b/units/systemd-update-utmp.service.in
index 163eccd..da7dda7 100644
--- a/units/systemd-update-utmp.service.in
+++ b/units/systemd-update-utmp.service.in
@@ -11,7 +11,7 @@ Documentation=man:systemd-update-utmp.service(8) man:utmp(5)
DefaultDependencies=no
RequiresMountsFor=/var/log/wtmp
Conflicts=shutdown.target
-After=systemd-remount-fs.service systemd-tmpfiles-setup.service auditd.service
+After=systemd-readahead-collect.service systemd-readahead-replay.service systemd-remount-fs.service systemd-tmpfiles-setup.service auditd.service
Before=sysinit.target shutdown.target
[Service]
diff --git a/units/systemd-vconsole-setup.service.in b/units/systemd-vconsole-setup.service.in
index 6160361..18faa63 100644
--- a/units/systemd-vconsole-setup.service.in
+++ b/units/systemd-vconsole-setup.service.in
@@ -10,6 +10,7 @@ Description=Setup Virtual Console
Documentation=man:systemd-vconsole-setup.service(8) man:vconsole.conf(5)
DefaultDependencies=no
Conflicts=shutdown.target
+After=systemd-readahead-collect.service systemd-readahead-replay.service
Before=sysinit.target shutdown.target
ConditionPathExists=/dev/tty0