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 4.8.                 January 2017                      BLK_QUEUE_PREP_RQ(9)