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blk_rq_check_limits
Langue: en
Version: May 2009 (fedora - 06/07/09)
Section: 9 (Appels noyau Linux)
NAME
blk_rq_check_limits - Helper function to check a request for the queue limitSYNOPSIS
- int blk_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.
This function should also be useful for request stacking drivers in some cases below, so export this fuction. Request stacking drivers like request-based dm may change the queue limits while requests are in the queue (e.g. dm's table swapping). Such request stacking drivers should check those requests agaist the new queue limits again when they dispatch those requests, although such checkings are also done against the old queue limits when submitting requests.
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