int do_writepages(struct address_space *mapping, struct writeback_control *wbc);
int sync_page_range(struct inode *inode, struct address_space *mapping,
loff_t pos, size_t count);
-int sync_page_range_nolock(struct inode *inode, struct address_space
- *mapping, loff_t pos, size_t count);
/* pdflush.c */
extern int nr_pdflush_threads; /* Global so it can be exported to sysctl