systemd/early-sync-shutdown.patch

From c65eb8365344eeb72ee2c0b333ab54d925263b3f Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 25 Jan 2013 22:33:33 +0100
Subject: [PATCH] shutdown: issue a sync() as soon as shutdown.target is queued

---
 Makefile.am            |  7 ++++--
 src/core/job.c         | 26 ++++++++++++++++++++
 src/core/job.h         |  2 ++
 src/core/sync.c        | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++
 src/core/sync.h        | 24 +++++++++++++++++++
 src/core/transaction.c |  1 +
 6 files changed, 123 insertions(+), 2 deletions(-)
 create mode 100644 src/core/sync.c
 create mode 100644 src/core/sync.h

Index: systemd-195/Makefile.am
===================================================================
--- systemd-195.orig/Makefile.am
+++ systemd-195/Makefile.am
@@ -1038,7 +1038,9 @@ libsystemd_core_la_SOURCES = \
 	src/core/syscall-list.c \
 	src/core/syscall-list.h \
 	src/core/audit-fd.c \
-	src/core/audit-fd.h
+	src/core/audit-fd.h \
+	src/core/sync.c \
+	src/core/sync.h
 
 nodist_libsystemd_core_la_SOURCES = \
 	src/core/load-fragment-gperf.c \
@@ -1052,7 +1054,8 @@ libsystemd_core_la_CFLAGS = \
 	$(LIBWRAP_CFLAGS) \
 	$(PAM_CFLAGS) \
 	$(AUDIT_CFLAGS) \
-	$(KMOD_CFLAGS)
+	$(KMOD_CFLAGS) \
+	-pthread
 
 libsystemd_core_la_LIBADD = \
 	libsystemd-capability.la \
Index: systemd-195/src/core/job.c
===================================================================
--- systemd-195.orig/src/core/job.c
+++ systemd-195/src/core/job.c
@@ -34,6 +34,9 @@
 #include "load-dropin.h"
 #include "log.h"
 #include "dbus-job.h"
+#include "special.h"
+#include "sync.h"
+#include "virt.h"
 
 JobBusClient* job_bus_client_new(DBusConnection *connection, const char *name) {
         JobBusClient *cl;
@@ -1045,6 +1048,29 @@ int job_coldplug(Job *j) {
         return 0;
 }
 
+void job_shutdown_magic(Job *j) {
+        assert(j);
+
+        /* The shutdown target gets some special treatment here: we
+         * tell the kernel to begin with flushing its disk caches, to
+         * optimize shutdown time a bit. Ideally we wouldn't hardcode
+         * this magic into PID 1. However all other processes aren't
+         * options either since they'd exit much sooner than PID 1 and
+         * asynchronous sync() would cause their exit to be
+         * delayed. */
+
+        if (!unit_has_name(j->unit, SPECIAL_SHUTDOWN_TARGET))
+                return;
+
+        if (j->type != JOB_START)
+                return;
+
+        if (detect_container(NULL) > 0)
+                return;
+
+        asynchronous_sync();
+}
+
 static const char* const job_state_table[_JOB_STATE_MAX] = {
         [JOB_WAITING] = "waiting",
         [JOB_RUNNING] = "running"
Index: systemd-195/src/core/job.h
===================================================================
--- systemd-195.orig/src/core/job.h
+++ systemd-195/src/core/job.h
@@ -217,6 +217,8 @@ int job_finish_and_invalidate(Job *j, Jo
 
 char *job_dbus_path(Job *j);
 
+void job_shutdown_magic(Job *j);
+
 const char* job_type_to_string(JobType t);
 JobType job_type_from_string(const char *s);
 
Index: systemd-195/src/core/sync.c
===================================================================
--- /dev/null
+++ systemd-195/src/core/sync.c
@@ -0,0 +1,65 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 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 <pthread.h>
+#include <unistd.h>
+
+#include "sync.h"
+
+static void *sync_thread(void *p) {
+        sync();
+        return NULL;
+}
+
+int asynchronous_sync(void) {
+        pthread_attr_t a;
+        pthread_t t;
+        int r;
+
+        /* It kinda sucks that we have to resort to threads to
+         * implement an asynchronous sync(), but well, such is
+         * life.
+         *
+         * Note that issuing this command right before exiting a
+         * process will cause the process to wait for the sync() to
+         * complete. This function hence is nicely asynchronous really
+         * only in long running processes. */
+
+        r = pthread_attr_init(&a);
+        if (r != 0)
+                return -r;
+
+        r = pthread_attr_setdetachstate(&a, PTHREAD_CREATE_DETACHED);
+        if (r != 0) {
+                r = -r;
+                goto finish;
+        }
+
+        r = pthread_create(&t, &a, sync_thread, NULL);
+        if (r != 0) {
+                r = -r;
+                goto finish;
+        }
+
+finish:
+        pthread_attr_destroy(&a);
+        return r;
+}
Index: systemd-195/src/core/sync.h
===================================================================
--- /dev/null
+++ systemd-195/src/core/sync.h
@@ -0,0 +1,24 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 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/>.
+***/
+
+int asynchronous_sync(void);
Index: systemd-195/src/core/transaction.c
===================================================================
--- systemd-195.orig/src/core/transaction.c
+++ systemd-195/src/core/transaction.c
@@ -592,6 +592,7 @@ static int transaction_apply(Transaction
                 job_add_to_run_queue(j);
                 job_add_to_dbus_queue(j);
                 job_start_timer(j);
+                job_shutdown_magic(j);
         }
 
         return 0;