BLK_QUEUE_PREP_RQ

Section: Block Devices (9)
Updated: February 2011
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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.  

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