Provided by: linux-doc-2.6.15_2.6.15-23.39_all bug

NAME

       blk_queue_prep_rq - set a prepare_request function for queue

SYNOPSIS

       void blk_queue_prep_rq  (request_queue_t * 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.