BLK_CLONED_RQ_CHECK_(9)                   Block Devices                   BLK_CLONED_RQ_CHECK_(9)



NAME
       blk_cloned_rq_check_limits - Helper function to check a cloned request for new the queue
       limits

SYNOPSIS
       int blk_cloned_rq_check_limits(struct request_queue * q, struct request * rq);

ARGUMENTS
       q
           the queue

       rq
           the request being checked

DESCRIPTION
       rq may have been made based on weaker limitations of upper-level queues in request
       stacking drivers, and it may violate the limitation of q. Since the block layer and the
       underlying device driver trust rq after it is inserted to q, it should be checked against
       q before the insertion using this generic function.

       Request stacking drivers like request-based dm may change the queue limits when retrying
       requests on other queues. Those requests need to be checked against the new queue limits
       again during dispatch.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   BLK_CLONED_RQ_CHECK_(9)