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authorTejun Heo <tj@kernel.org>2011-12-14 00:33:41 +0100
committerJens Axboe <axboe@kernel.dk>2011-12-14 00:33:41 +0100
commita612fddf0d8090f2877305c9168b6c1a34fb5d90 (patch)
treeb59047a1670469362e1ea44093522224bdcf5aae /block/cfq-iosched.c
parentc58698073218f2c8f2fc5982fa3938c2d3803b9f (diff)
block, cfq: move cfqd->icq_list to request_queue and add request->elv.icq
Most of icq management is about to be moved out of cfq into blk-ioc. This patch prepares for it. * Move cfqd->icq_list to request_queue->icq_list * Make request explicitly point to icq instead of through elevator private data. ->elevator_private[3] is replaced with sub struct elv which contains icq pointer and priv[2]. cfq is updated accordingly. * Meaningless clearing of ->elevator_private[0] removed from elv_set_request(). At that point in code, the field was guaranteed to be %NULL anyway. This patch doesn't introduce any functional change. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/cfq-iosched.c')
-rw-r--r--block/cfq-iosched.c28
1 files changed, 11 insertions, 17 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index d2f16fcdec7..9bc5ecc1b33 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -54,9 +54,9 @@ static const int cfq_hist_divisor = 4;
#define CFQQ_SECT_THR_NONROT (sector_t)(2 * 32)
#define CFQQ_SEEKY(cfqq) (hweight32(cfqq->seek_history) > 32/8)
-#define RQ_CIC(rq) icq_to_cic((rq)->elevator_private[0])
-#define RQ_CFQQ(rq) (struct cfq_queue *) ((rq)->elevator_private[1])
-#define RQ_CFQG(rq) (struct cfq_group *) ((rq)->elevator_private[2])
+#define RQ_CIC(rq) icq_to_cic((rq)->elv.icq)
+#define RQ_CFQQ(rq) (struct cfq_queue *) ((rq)->elv.priv[0])
+#define RQ_CFQG(rq) (struct cfq_group *) ((rq)->elv.priv[1])
static struct kmem_cache *cfq_pool;
static struct kmem_cache *cfq_icq_pool;
@@ -297,8 +297,6 @@ struct cfq_data {
unsigned int cfq_group_idle;
unsigned int cfq_latency;
- struct list_head icq_list;
-
/*
* Fallback dummy cfqq for extreme OOM conditions
*/
@@ -3053,7 +3051,7 @@ static int cfq_create_cic(struct cfq_data *cfqd, gfp_t gfp_mask)
ret = radix_tree_insert(&ioc->icq_tree, q->id, icq);
if (likely(!ret)) {
hlist_add_head(&icq->ioc_node, &ioc->icq_list);
- list_add(&icq->q_node, &cfqd->icq_list);
+ list_add(&icq->q_node, &q->icq_list);
icq = NULL;
} else if (ret == -EEXIST) {
/* someone else already did it */
@@ -3605,12 +3603,10 @@ static void cfq_put_request(struct request *rq)
put_io_context(RQ_CIC(rq)->icq.ioc, cfqq->cfqd->queue);
- rq->elevator_private[0] = NULL;
- rq->elevator_private[1] = NULL;
-
/* Put down rq reference on cfqg */
cfq_put_cfqg(RQ_CFQG(rq));
- rq->elevator_private[2] = NULL;
+ rq->elv.priv[0] = NULL;
+ rq->elv.priv[1] = NULL;
cfq_put_queue(cfqq);
}
@@ -3696,9 +3692,9 @@ new_queue:
cfqq->allocated[rw]++;
cfqq->ref++;
- rq->elevator_private[0] = &cic->icq;
- rq->elevator_private[1] = cfqq;
- rq->elevator_private[2] = cfq_ref_get_cfqg(cfqq->cfqg);
+ rq->elv.icq = &cic->icq;
+ rq->elv.priv[0] = cfqq;
+ rq->elv.priv[1] = cfq_ref_get_cfqg(cfqq->cfqg);
spin_unlock_irq(q->queue_lock);
return 0;
@@ -3810,8 +3806,8 @@ static void cfq_exit_queue(struct elevator_queue *e)
if (cfqd->active_queue)
__cfq_slice_expired(cfqd, cfqd->active_queue, 0);
- while (!list_empty(&cfqd->icq_list)) {
- struct io_cq *icq = list_entry(cfqd->icq_list.next,
+ while (!list_empty(&q->icq_list)) {
+ struct io_cq *icq = list_entry(q->icq_list.next,
struct io_cq, q_node);
struct io_context *ioc = icq->ioc;
@@ -3922,8 +3918,6 @@ static void *cfq_init_queue(struct request_queue *q)
cfqd->oom_cfqq.ref++;
cfq_link_cfqq_cfqg(&cfqd->oom_cfqq, &cfqd->root_group);
- INIT_LIST_HEAD(&cfqd->icq_list);
-
cfqd->queue = q;
init_timer(&cfqd->idle_slice_timer);