Name
write_one_page — 
     write out a single page and optionally wait on I/O
 
Synopsis
| int write_one_page ( | struct page * page, | 
|  | int wait ); | 
 
Arguments
- page
- 
     the page to write
     
- wait
- 
     if true, wait on writeout
     
Description
   The page must be locked by the caller and will be unlocked upon return.
   
   write_one_page returns a negative error code if I/O failed.