centos man page for blk_peek_request

BLK_PEEK_REQUEST(9)						   Block Devices					       BLK_PEEK_REQUEST(9)

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.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						       BLK_PEEK_REQUEST(9)