mdmon: don't lie to systemd.

Now that mdmon responds fairly well to SIGTERM, stop lying to
systemd about being started on the initrd.

Note that if mdmon is rerun (--takeover) for some reason, and systemd
chooses to kill processes before remounting / readonly, then the
unmount will hang.

If systemd ever lets us tell it that we don't want to be killed until
root is readonly, then we should do that.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 8 insertions, 4 deletions

diff --git a/mdmon.c b/mdmon.c
index 13f95109..f0b06237 100644
--- a/mdmon.c
+++ b/mdmon.c
@@ -298,10 +298,14 @@ int main(int argc, char *argv[])
 		{NULL, 0, NULL, 0}
 	};
 
-	/*
-	 * Always change process name to @dmon to avoid systemd killing it
-	 */
-	argv[0][0] = '@';
+	if (in_initrd()) {
+		/*
+		 * set first char of argv[0] to @. This is used by
+		 * systemd to signal that the task was launched from
+		 * initrd/initramfs and should be preserved during shutdown
+		 */
+		argv[0][0] = '@';
+	}
 
 	while ((opt = getopt_long(argc, argv, "thaF", options, NULL)) != -1) {
 		switch (opt) {