Name
blk_peek_request — 
     peek at the top of a request queue
 
Synopsis
| struct request * blk_peek_request ( | struct request_queue * q ); | 
 
Arguments
- q
- 
     request queue to peek at
     
Description
   Return the request at the top of q.  The returned request
   should be started using blk_start_request before LLD starts
   processing it.
Return
   Pointer to the request at the top of q if available.  Null
   otherwise.
Context
   queue_lock must be held.