From 15b8bae3002285cdce4f24ce947a89b19eda53b6 Mon Sep 17 00:00:00 2001
From: Peter Volkov <pva@gentoo.org>
Date: Sat, 11 May 2013 20:31:01 +0400
Subject: [PATCH] Start garbage collector for nilfs2 as root fs

Use mount -f / to add entry to mtab. As a side effect this starts
nilfs2 garbage collector as expected and documented in man mount.nilfs2.

https://bugs.gentoo.org/show_bug.cgi?id=339472
---
 init.d/mtab.in | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/init.d/mtab.in b/init.d/mtab.in
index beee3e1..ca9aad9 100644
--- a/init.d/mtab.in
+++ b/init.d/mtab.in
@@ -15,20 +15,27 @@ start()
 	if [ -L /etc/mtab ]
 	then
 		einfo "Skipping mtab update (mtab is a symbolic link)"
+		mount -f / > /dev/null 2>&1
 		return 0
 	fi
 
 	ebegin "Updating /etc/mtab"
 	if ! echo 2>/dev/null >/etc/mtab; then
 		ewend 1 "/etc/mtab is not updateable"
+		mount -f / > /dev/null 2>&1
 		return 0
 	fi
 
-	# With / as tmpfs we cannot umount -at tmpfs in localmount as that
-	# makes / readonly and dismounts all tmpfs even if in use which is
-	# not good. Luckily, umount uses /etc/mtab instead of /proc/mounts
-	# which allows this hack to work.
-	grep -v "^[! ]* / tmpfs " /proc/mounts > /etc/mtab
+	# Add the entry for / to mtab
+	if $(grep -qv "^[! ]* / tmpfs " /proc/mounts); then
+		mount -f / > /dev/null 2>&1
+	else
+		# With / as tmpfs we cannot umount -at tmpfs in localmount as
+		# that makes / readonly and dismounts all tmpfs even if in use
+		# which is not good. Luckily, umount uses /etc/mtab instead of
+		# /proc/mounts which allows this hack to work.
+		grep -v "^[! ]* / tmpfs " /proc/mounts > /etc/mtab
+	fi
 
 	# Remove stale backups
 	rm -f /etc/mtab~ /etc/mtab~~
-- 
1.8.1.5