systemd/sync-on-shutdown.patch

From 0049f05a8bb82c3e084bacc5945596761d706c55 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 16 Nov 2012 01:30:29 +0100
Subject: [PATCH] shutdown: readd explicit sync() when shutting down

As it turns out reboot() doesn't actually imply a file system sync, but
only a disk sync. Accordingly, readd explicit sync() invocations
immediately before we invoke reboot().

This is much less dramatic than it might sounds as we umount all
disks/read-only remount them anyway before going down.
---
 src/core/service.c  |    1 +
 src/core/shutdown.c |    7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/src/core/service.c b/src/core/service.c
index cf08485..df72aba 100644
--- a/src/core/service.c
+++ b/src/core/service.c
@@ -2485,6 +2485,7 @@ static int service_start_limit_test(Service *s) {
 
         case SERVICE_START_LIMIT_REBOOT_IMMEDIATE:
                 log_warning("%s start request repeated too quickly, rebooting immediately.", UNIT(s)->id);
+                sync();
                 reboot(RB_AUTOBOOT);
                 break;
 
diff --git a/src/core/shutdown.c b/src/core/shutdown.c
index cc8c57b..b59aef1 100644
--- a/src/core/shutdown.c
+++ b/src/core/shutdown.c
@@ -273,6 +273,13 @@ int main(int argc, char *argv[]) {
                 }
         }
 
+        /* The kernel will automaticall flush ATA disks and suchlike
+         * on reboot(), but the file systems need to be synce'd
+         * explicitly in advance. So let's do this here, but not
+         * needlessly slow down containers. */
+        if (!in_container)
+                sync();
+
         if (cmd == LINUX_REBOOT_CMD_KEXEC) {
 
                 if (!in_container) {
-- 
1.7.10.4