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block: add mq_ops->queue_rqs hook

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If we have a list of requests in our plug list, send it to the driver in
one go, if possible. The driver must set mq_ops->queue_rqs() to support
this, if not the usual one-by-one path is used.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-12-03 06:48:53 -07:00
parent fcade2ce06
commit 3c67d44de7
2 changed files with 31 additions and 3 deletions
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8
include/linux/blk-mq.h
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@ -492,6 +492,14 @@ struct blk_mq_ops {
*/
void (*commit_rqs)(struct blk_mq_hw_ctx *);
/**
* @queue_rqs: Queue a list of new requests. Driver is guaranteed
* that each request belongs to the same queue. If the driver doesn't
* empty the @rqlist completely, then the rest will be queued
* individually by the block layer upon return.
*/
void (*queue_rqs)(struct request **rqlist);
/**
* @get_budget: Reserve budget before queue request, once .queue_rq is
* run, it is driver's responsibility to release the