1BLK_QUEUE_PREP_RQ(9)             Block Devices            BLK_QUEUE_PREP_RQ(9)
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NAME

6       blk_queue_prep_rq - set a prepare_request function for queue
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SYNOPSIS

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

12       q
13           queue
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15       pfn
16           prepare_request function
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DESCRIPTION

19       It's possible for a queue to register a prepare_request callback which
20       is invoked before the request is handed to the request_fn. The goal of
21       the function is to prepare a request for I/O, it can be used to build a
22       cdb from the request data for instance.
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25Kernel Hackers Manual 3.10         June 2019              BLK_QUEUE_PREP_RQ(9)
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