VFS: Add GPL_EXPORTED function vfs_kern_mount()

do_kern_mount() does not allow the kernel to use private mount interfaces
without exposing the same interfaces to userland. The problem is that the
filesystem is referenced by name, thus meaning that it and its mount
interface must be registered in the global filesystem list.

vfs_kern_mount() passes the struct file_system_type as an explicit
parameter in order to overcome this limitation.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/mount.h b/include/linux/mount.h
index b7472ae91fa4..aff68c3660f5 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -73,6 +73,11 @@ extern struct vfsmount *alloc_vfsmnt(const char *name);
 extern struct vfsmount *do_kern_mount(const char *fstype, int flags,
                                       const char *name, void *data);
 
+struct file_system_type;
+extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
+                                      int flags, const char *name,
+                                      void *data);
+
 struct nameidata;
 
 extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,