diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/cfq-iosched.c | 94 |
1 files changed, 41 insertions, 53 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index f6d315551496..11f49d036845 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -59,7 +59,6 @@ static const int cfq_hist_divisor = 4; #define RQ_CFQG(rq) (struct cfq_group *) ((rq)->elv.priv[1]) static struct kmem_cache *cfq_pool; -static struct kmem_cache *cfq_icq_pool; #define CFQ_PRIO_LISTS IOPRIO_BE_NR #define cfq_class_idle(cfqq) ((cfqq)->ioprio_class == IOPRIO_CLASS_IDLE) @@ -2707,6 +2706,13 @@ static void cfq_exit_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq) cfq_put_queue(cfqq); } +static void cfq_init_icq(struct io_cq *icq) +{ + struct cfq_io_cq *cic = icq_to_cic(icq); + + cic->ttime.last_end_request = jiffies; +} + static void cfq_exit_icq(struct io_cq *icq) { struct cfq_io_cq *cic = icq_to_cic(icq); @@ -2723,21 +2729,6 @@ static void cfq_exit_icq(struct io_cq *icq) } } -static struct cfq_io_cq *cfq_alloc_cic(struct cfq_data *cfqd, gfp_t gfp_mask) -{ - struct cfq_io_cq *cic; - - cic = kmem_cache_alloc_node(cfq_icq_pool, gfp_mask | __GFP_ZERO, - cfqd->queue->node); - if (cic) { - cic->ttime.last_end_request = jiffies; - INIT_LIST_HEAD(&cic->icq.q_node); - INIT_HLIST_NODE(&cic->icq.ioc_node); - } - - return cic; -} - static void cfq_init_prio_data(struct cfq_queue *cfqq, struct io_context *ioc) { struct task_struct *tsk = current; @@ -2945,64 +2936,62 @@ cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct io_context *ioc, } /** - * cfq_create_cic - create and link a cfq_io_cq - * @cfqd: cfqd of interest + * ioc_create_icq - create and link io_cq + * @q: request_queue of interest * @gfp_mask: allocation mask * - * Make sure cfq_io_cq linking %current->io_context and @cfqd exists. If - * ioc and/or cic doesn't exist, they will be created using @gfp_mask. + * Make sure io_cq linking %current->io_context and @q exists. If either + * io_context and/or icq don't exist, they will be created using @gfp_mask. + * + * The caller is responsible for ensuring @ioc won't go away and @q is + * alive and will stay alive until this function returns. */ -static int cfq_create_cic(struct cfq_data *cfqd, gfp_t gfp_mask) +static struct io_cq *ioc_create_icq(struct request_queue *q, gfp_t gfp_mask) { - struct request_queue *q = cfqd->queue; - struct io_cq *icq = NULL; - struct cfq_io_cq *cic; + struct elevator_type *et = q->elevator->type; struct io_context *ioc; - int ret = -ENOMEM; - - might_sleep_if(gfp_mask & __GFP_WAIT); + struct io_cq *icq; /* allocate stuff */ ioc = create_io_context(current, gfp_mask, q->node); if (!ioc) - goto out; + return NULL; - cic = cfq_alloc_cic(cfqd, gfp_mask); - if (!cic) - goto out; - icq = &cic->icq; + icq = kmem_cache_alloc_node(et->icq_cache, gfp_mask | __GFP_ZERO, + q->node); + if (!icq) + return NULL; - ret = radix_tree_preload(gfp_mask); - if (ret) - goto out; + if (radix_tree_preload(gfp_mask) < 0) { + kmem_cache_free(et->icq_cache, icq); + return NULL; + } icq->ioc = ioc; - icq->q = cfqd->queue; + icq->q = q; + INIT_LIST_HEAD(&icq->q_node); + INIT_HLIST_NODE(&icq->ioc_node); /* lock both q and ioc and try to link @icq */ spin_lock_irq(q->queue_lock); spin_lock(&ioc->lock); - ret = radix_tree_insert(&ioc->icq_tree, q->id, icq); - if (likely(!ret)) { + if (likely(!radix_tree_insert(&ioc->icq_tree, q->id, icq))) { hlist_add_head(&icq->ioc_node, &ioc->icq_list); list_add(&icq->q_node, &q->icq_list); - icq = NULL; - } else if (ret == -EEXIST) { - /* someone else already did it */ - ret = 0; + if (et->ops.elevator_init_icq_fn) + et->ops.elevator_init_icq_fn(icq); + } else { + kmem_cache_free(et->icq_cache, icq); + icq = ioc_lookup_icq(ioc, q); + if (!icq) + printk(KERN_ERR "cfq: icq link failed!\n"); } spin_unlock(&ioc->lock); spin_unlock_irq(q->queue_lock); - radix_tree_preload_end(); -out: - if (ret) - printk(KERN_ERR "cfq: icq link failed!\n"); - if (icq) - kmem_cache_free(cfq_icq_pool, icq); - return ret; + return icq; } /** @@ -3022,7 +3011,6 @@ static struct cfq_io_cq *cfq_get_cic(struct cfq_data *cfqd, gfp_t gfp_mask) struct request_queue *q = cfqd->queue; struct cfq_io_cq *cic = NULL; struct io_context *ioc; - int err; lockdep_assert_held(q->queue_lock); @@ -3037,9 +3025,9 @@ static struct cfq_io_cq *cfq_get_cic(struct cfq_data *cfqd, gfp_t gfp_mask) /* slow path - unlock, create missing ones and retry */ spin_unlock_irq(q->queue_lock); - err = cfq_create_cic(cfqd, gfp_mask); + cic = icq_to_cic(ioc_create_icq(q, gfp_mask)); spin_lock_irq(q->queue_lock); - if (err) + if (!cic) return NULL; } @@ -3975,6 +3963,7 @@ static struct elevator_type iosched_cfq = { .elevator_completed_req_fn = cfq_completed_request, .elevator_former_req_fn = elv_rb_former_request, .elevator_latter_req_fn = elv_rb_latter_request, + .elevator_init_icq_fn = cfq_init_icq, .elevator_exit_icq_fn = cfq_exit_icq, .elevator_set_req_fn = cfq_set_request, .elevator_put_req_fn = cfq_put_request, @@ -4028,7 +4017,6 @@ static int __init cfq_init(void) kmem_cache_destroy(cfq_pool); return ret; } - cfq_icq_pool = iosched_cfq.icq_cache; blkio_policy_register(&blkio_policy_cfq); |