Index: build/qemu/init.c
==================================================================
--- build/qemu/init.c
+++ build/qemu/init.c
@@ -46,11 +46,11 @@
 
 int main(int argc, char **argv) {
 	/*
 	 * Remount root filesystem read-write
 	 */
-	mount("/dev/vda2", "/", "ext2", MS_REMOUNT, NULL);
+	mount("/dev/vda2", "/", "ext4", MS_REMOUNT, NULL);
 
 	/*
 	 * Mount needed filesystems
 	 */
 	mkdir("/dev", 0755);
@@ -69,10 +69,11 @@
 	 * Setup networking
 	 */
 	run("/bin/init-networking", "init-networking", NULL);
 	run("/bin/init-fuse", "init-fuse", NULL);
 
+	mkdir("/etc", 0755);
 	mkdir("/bin", 0755);
 	mkdir("/lib", 0755);
 	mkdir("/opt", 0755);
 	mkdir("/opt/appfs", 0755);
 	mkdir("/var", 0755);
@@ -80,10 +81,12 @@
 	mkdir("/var/cache/appfs", 0755);
 	run("/bin/appfsd", "appfsd", "/var/cache/appfs", "/opt/appfs", NULL);
 
 	symlink(".", "/usr");
 	symlink("lib", "/lib64");
+
+	symlink("/proc/self/mounts", "/etc/mtab");
 
 	symlink("/opt/appfs/core.appfs.rkeene.org/bash/platform/latest/bin/bash", "/bin/bash");
 	symlink("/opt/appfs/core.appfs.rkeene.org/coreutils/platform/latest/bin/env", "/bin/env");
 
 	symlink("/bin/bash", "/bin/sh");
@@ -93,7 +96,18 @@
 	run("/bin/appfs-cache", "appfs-cache", "install", "core.appfs.rkeene.org", "coreutils", NULL);
 	setenv("PATH", "/bin", 1);
 
 	run("/bin/sh", "sh", NULL);
 
+	/*
+	 * Remount root filesystem read-only
+	 */
+	umount("/dev");
+	umount("/tmp");
+	umount("/proc");
+	umount("/sys");
+	umount("/opt/appfs");
+	mount("/dev/vda2", "/", "ext4", MS_REMOUNT | MS_RDONLY, NULL);
+	sync();
+
 	return(0);
 }