blk_cloned_rq_check_limits(9) - phpMan
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)
|