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block, cfq: move cfqd->cic_index to q->id

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cfq allocates per-queue id using ida and uses it to index cic radix
tree from io_context.  Move it to q->id and allocate on queue init and
free on queue release.  This simplifies cfq a bit and will allow for
further improvements of io context life-cycle management.

This patch doesn't introduce any functional difference.

Signed-off-by: Tejun Heo <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2011-12-14 00:33:37 +01:00 • committed by Jens Axboe
commit a73f730d01
5 changed files with 32 additions and 55 deletions
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3
block/blk.h
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@ -1,6 +1,8 @@
#ifndef BLK_INTERNAL_H
#define BLK_INTERNAL_H
#include <linux/idr.h>
/* Amount of time in which a process may batch requests */
#define BLK_BATCH_TIME (HZ/50UL)
@ -9,6 +11,7 @@
extern struct kmem_cache *blk_requestq_cachep;
extern struct kobj_type blk_queue_ktype;
extern struct ida blk_queue_ida;
void init_request_from_bio(struct request *req, struct bio *bio);
void blk_rq_bio_prep(struct request_queue *q, struct request *rq,