---
 fs/mount.h          |    1 +
 fs/mountfs/super.c  |   12 +++++++++++-
 fs/proc_namespace.c |    2 +-
 3 files changed, 13 insertions(+), 2 deletions(-)

--- a/fs/mount.h
+++ b/fs/mount.h
@@ -186,3 +186,4 @@ void mountfs_create(struct mount *mnt);
 extern void mountfs_remove(struct mount *mnt);
 int mountfs_lookup_internal(struct vfsmount *m, struct path *path);
 
+int show_mountinfo(struct seq_file *m, struct vfsmount *mnt);
--- a/fs/mountfs/super.c
+++ b/fs/mountfs/super.c
@@ -22,7 +22,7 @@ struct mountfs_entry {
 
 static const char *mountfs_attrs[] = {
 	"root", "mountpoint", "id", "parent", "options", "children",
-	"group", "master", "propagate_from", "counter"
+	"group", "master", "propagate_from", "counter", "info"
 };
 
 #define MOUNTFS_INO(id) (((unsigned long) id + 1) * \
@@ -126,11 +126,21 @@ static int mountfs_attr_show(struct seq_
 		if (IS_MNT_SLAVE(mnt)) {
 			get_fs_root(current->fs, &root);
 			tmp = get_dominating_id(mnt, &root);
+			path_put(&root);
 			if (tmp)
 				seq_printf(sf, "%i\n", tmp);
 		}
 	} else if (strcmp(name, "counter") == 0) {
 		seq_printf(sf, "%u\n", atomic_read(&mnt->mnt_topology_changes));
+	} else if (strcmp(name, "info") == 0) {
+		struct proc_mounts p = {};
+
+		WARN_ON(sf->private);
+		sf->private = &p;
+		get_fs_root(current->fs, &p.root);
+		err = show_mountinfo(sf, m);
+		path_put(&p.root);
+		sf->private = NULL;
 	} else {
 		WARN_ON(1);
 		err = -EIO;
--- a/fs/proc_namespace.c
+++ b/fs/proc_namespace.c
@@ -110,7 +110,7 @@ static int show_vfsmnt(struct seq_file *
 	return err;
 }
 
-static int show_mountinfo(struct seq_file *m, struct vfsmount *mnt)
+int show_mountinfo(struct seq_file *m, struct vfsmount *mnt)
 {
 	struct proc_mounts *p = m->private;
 	struct mount *r = real_mount(mnt);