1static void null_destroy(struct vm_store *store) 2 Frees this stores space. 3 4static off_t null_commit(struct vm_store *store, off_t size) 5 Sets committed size to size and returns it. 6 7static int null_has_page(struct vm_store *store, off_t offset) 8 returns 1. 9 10static ssize_t null_read(struct vm_store *store, off_t offset, iovecs *vecs) 11 Returns -1. 12 13static ssize_t null_write(struct vm_store *store, off_t offset, iovecs *vecs) 14 Returns -1. 15 16static int null_fault(struct vm_store *store, struct vm_address_space *aspace, off_t offset) 17 Returns a Fatal page fault error. 18 19vm_store *vm_store_create_null(void) 20 Creates an empty vm_store struct.