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.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/core/shutdown.c b/src/core/shutdown.c
index cc8c57bd2..b59aef174 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) {