The Linux Kernel API
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blk_queue_prep_rq

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.

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