From Linux Man Pages
__register_filesystem - register a new filesystem
int __register_filesystem (struct file_system_type * fs, int lifo);
ARGUMENTS
fs the file system structure
lifo -- undescribed --
DESCRIPTION
Adds the file system passed to the list of file systems the kernel is
aware of for mount and other syscalls. Returns 0 on success, or a
negative errno code on an error.
The &struct file_system_type that is passed is linked into the kernel
structures and must not be freed until the file system has been
unregistered.
CATEGORY