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Commit 1238033c authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
Browse files

block, cfq: kill cic->key 



Now that lazy paths are removed, cfqd_dead_key() is meaningless and
cic->q can be used whereever cic->key is used.  Kill cic->key.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent b50b636b

block/cfq-iosched.c

+5 −21
Original line number Diff line number Diff line
@@ -472,22 +472,9 @@ static inline void cic_set_cfqq(struct cfq_io_context *cic, 
	cic->cfqq[is_sync] = cfqq;

}



#define CIC_DEAD_KEY	1ul

#define CIC_DEAD_INDEX_SHIFT	1



static inline void *cfqd_dead_key(struct cfq_data *cfqd)

{

	return (void *)(cfqd->queue->id << CIC_DEAD_INDEX_SHIFT | CIC_DEAD_KEY);

}



static inline struct cfq_data *cic_to_cfqd(struct cfq_io_context *cic)

{

	struct cfq_data *cfqd = cic->key;



	if (unlikely((unsigned long) cfqd & CIC_DEAD_KEY))

		return NULL;



	return cfqd;

	return cic->q->elevator->elevator_data;

}



/*
@@ -2679,10 +2666,8 @@ static void cfq_cic_free(struct cfq_io_context *cic) 
static void cfq_release_cic(struct cfq_io_context *cic)

{

	struct io_context *ioc = cic->ioc;

	unsigned long dead_key = (unsigned long) cic->key;



	BUG_ON(!(dead_key & CIC_DEAD_KEY));

	radix_tree_delete(&ioc->radix_root, dead_key >> CIC_DEAD_INDEX_SHIFT);

	radix_tree_delete(&ioc->radix_root, cic->q->id);

	hlist_del(&cic->cic_list);

	cfq_cic_free(cic);

}
@@ -2726,7 +2711,6 @@ static void cfq_exit_cic(struct cfq_io_context *cic) 
	struct io_context *ioc = cic->ioc;



	list_del_init(&cic->queue_list);

	cic->key = cfqd_dead_key(cfqd);



	/*

	 * Both setting lookup hint to and clearing it from @cic are done
@@ -2982,6 +2966,7 @@ cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct io_context *ioc, 
static struct cfq_io_context *

cfq_cic_lookup(struct cfq_data *cfqd, struct io_context *ioc)

{

	struct request_queue *q = cfqd->queue;

	struct cfq_io_context *cic;



	lockdep_assert_held(cfqd->queue->queue_lock);
@@ -2996,11 +2981,11 @@ cfq_cic_lookup(struct cfq_data *cfqd, struct io_context *ioc) 
	 */

	rcu_read_lock();

	cic = rcu_dereference(ioc->ioc_data);

	if (cic && cic->key == cfqd)

	if (cic && cic->q == q)

		goto out;



	cic = radix_tree_lookup(&ioc->radix_root, cfqd->queue->id);

	if (cic && cic->key == cfqd)

	if (cic && cic->q == q)

		rcu_assign_pointer(ioc->ioc_data, cic);	/* allowed to race */

	else

		cic = NULL;
@@ -3040,7 +3025,6 @@ static int cfq_create_cic(struct cfq_data *cfqd, gfp_t gfp_mask) 
		goto out;



	cic->ioc = ioc;

	cic->key = cfqd;

	cic->q = cfqd->queue;



	/* lock both q and ioc and try to link @cic */

include/linux/iocontext.h

+0 −1
Original line number Diff line number Diff line
@@ -20,7 +20,6 @@ enum { 
};



struct cfq_io_context {

	void *key;

	struct request_queue *q;



	struct cfq_queue *cfqq[2];