1 files changed, 32 insertions, 0 deletions

diff --git a/init/do_mounts.c b/init/do_mounts.c
index 816014c4627e..5d8d48fd0ee4 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -26,6 +26,7 @@
 #include <linux/async.h>
 #include <linux/fs_struct.h>
 #include <linux/slab.h>
+#include <linux/ramfs.h>
 
 #include <linux/nfs_fs.h>
 #include <linux/nfs_fs_sb.h>
@@ -588,3 +589,34 @@ out:
         sys_mount(".", "/", NULL, MS_MOVE, NULL);
         sys_chroot(".");
 }
+
+static struct dentry *rootfs_mount(struct file_system_type *fs_type,
+        int flags, const char *dev_name, void *data)
+{
+        static unsigned long once;
+
+        if (test_and_set_bit(0, &once))
+                return ERR_PTR(-ENODEV);
+
+        return mount_nodev(fs_type, flags, data, ramfs_fill_super);
+}
+
+static struct file_system_type rootfs_fs_type = {
+        .name           = "rootfs",
+        .mount          = rootfs_mount,
+        .kill_sb        = kill_litter_super,
+};
+
+int __init init_rootfs(void)
+{
+        int err = register_filesystem(&rootfs_fs_type);
+
+        if (err)
+                return err;
+
+        err = init_ramfs_fs();
+        if (err)
+                unregister_filesystem(&rootfs_fs_type);
+
+        return err;
+}