blk_queue_prep_rq man page on Scientific

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BLK_QUEUE_PREP_RQ(9)		 Block Devices		  BLK_QUEUE_PREP_RQ(9)

NAME
       blk_queue_prep_rq - set a prepare_request function for queue

SYNOPSIS
       void blk_queue_prep_rq(struct request_queue * q, prep_rq_fn * pfn);

ARGUMENTS
       q
	   queue

       pfn
	   prepare_request function

DESCRIPTION
       It´s possible for a queue to register a prepare_request callback which
       is invoked before the request is handed to the request_fn. The goal of
       the function is to prepare a request for I/O, it can be used to build a
       cdb from the request data for instance.

COPYRIGHT
Kernel Hackers Manual 2.6.	 November 2013		  BLK_QUEUE_PREP_RQ(9)
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