int do_writepages(struct address_space *mapping, struct writeback_control *wbc);
void set_page_dirty_balance(struct page *page, int page_mkwrite);
void writeback_set_ratelimit(void);
+void tag_pages_for_writeback(struct address_space *mapping,
+ pgoff_t start, pgoff_t end);
/* pdflush.c */
extern int nr_pdflush_threads; /* Global so it can be exported to sysctl