1 files changed, 64 insertions, 0 deletions

diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c
new file mode 100644
index 000000000000..515741a8e6b8
--- /dev/null
+++ b/drivers/xen/xenfs/super.c
@@ -0,0 +1,64 @@
+/*
+ *  xenfs.c - a filesystem for passing info between the a domain and
+ *  the hypervisor.
+ *
+ * 2008-10-07  Alex Zeffertt    Replaced /proc/xen/xenbus with xenfs filesystem
+ *                              and /proc/xen compatibility mount point.
+ *                              Turned xenfs into a loadable module.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/magic.h>
+
+#include "xenfs.h"
+
+#include <asm/xen/hypervisor.h>
+
+MODULE_DESCRIPTION("Xen filesystem");
+MODULE_LICENSE("GPL");
+
+static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
+{
+        static struct tree_descr xenfs_files[] = {
+                [2] = {"xenbus", &xenbus_file_ops, S_IRUSR|S_IWUSR},
+                {""},
+        };
+
+        return simple_fill_super(sb, XENFS_SUPER_MAGIC, xenfs_files);
+}
+
+static int xenfs_get_sb(struct file_system_type *fs_type,
+                        int flags, const char *dev_name,
+                        void *data, struct vfsmount *mnt)
+{
+        return get_sb_single(fs_type, flags, data, xenfs_fill_super, mnt);
+}
+
+static struct file_system_type xenfs_type = {
+        .owner =        THIS_MODULE,
+        .name =         "xenfs",
+        .get_sb =       xenfs_get_sb,
+        .kill_sb =      kill_litter_super,
+};
+
+static int __init xenfs_init(void)
+{
+        if (xen_pv_domain())
+                return register_filesystem(&xenfs_type);
+
+        printk(KERN_INFO "XENFS: not registering filesystem on non-xen platform\n");
+        return 0;
+}
+
+static void __exit xenfs_exit(void)
+{
+        if (xen_pv_domain())
+                unregister_filesystem(&xenfs_type);
+}
+
+module_init(xenfs_init);
+module_exit(xenfs_exit);
+