struct page **filemap; /* list of cache pages for the file */
unsigned long *filemap_attr; /* attributes associated w/ filemap pages */
unsigned long file_pages; /* number of pages in the file */
+ int last_page_size; /* bytes in the last page */
unsigned long flags;
atomic_t pending_writes; /* pending writes to the bitmap file */
wait_queue_head_t write_wait;
+ wait_queue_head_t overflow_wait;
};