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blk-rq-qos: refactor out common elements of blk-wbt

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blkcg-qos is going to do essentially what wbt does, only on a cgroup
basis.  Break out the common code that will be shared between blkcg-qos
and wbt into blk-rq-qos.* so they can both utilize the same
infrastructure.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Josef Bacik 2018-07-03 09:32:35 -06:00 • committed by Jens Axboe
parent 2ecbf45635
commit a79050434b
10 changed files with 480 additions and 253 deletions
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4
include/linux/blkdev.h
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@ -42,7 +42,7 @@ struct bsg_job;
struct blkcg_gq;
struct blk_flush_queue;
struct pr_ops;
struct rq_wb;
struct rq_qos;
struct blk_queue_stats;
struct blk_stat_callback;
@ -443,7 +443,7 @@ struct request_queue {
int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */
struct blk_queue_stats *stats;
struct rq_wb *rq_wb;
struct rq_qos *rq_qos;
/*
* If blkcg is not used, @q->root_rl serves all requests. If blkcg