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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: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2011-12-14 00:33:40 +01:00 committed by Jens Axboe
parent b50b636bce
commit 1238033c79
2 changed files with 5 additions and 22 deletions
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26
block/cfq-iosched.c
View File

@ -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 */

1
include/linux/iocontext.h
View File

@ -20,7 +20,6 @@ enum {
};
struct cfq_io_context {
void *key;
struct request_queue *q;
struct cfq_queue *cfqq[2];