Name
journal_get_write_access — 
     notify intent to modify a buffer for metadata (not data) update.
 
Synopsis
| int journal_get_write_access ( | handle_t * handle, | 
|  | struct buffer_head * bh ); | 
 
Arguments
- handle
- 
     transaction to add buffer modifications to
     
- bh
- 
     bh to be used for metadata writes
     
Description
   Returns an error code or 0 on success.
   
   In full data journalling mode the buffer may be of type BJ_AsyncData,
   because we're writeing a buffer which is also part of a shared mapping.