}
EXPORT_SYMBOL_GPL(blk_queue_write_cache);
-/**
- * blk_queue_required_elevator_features - Set a queue required elevator features
- * @q: the request queue for the target device
- * @features: Required elevator features OR'ed together
- *
- * Tell the block layer that for the device controlled through @q, only the
- * only elevators that can be used are those that implement at least the set of
- * features specified by @features.
- */
-void blk_queue_required_elevator_features(struct request_queue *q,
- unsigned int features)
-{
- q->required_elevator_features = features;
-}
-EXPORT_SYMBOL_GPL(blk_queue_required_elevator_features);
-
/**
* blk_queue_can_use_dma_map_merging - configure queue for merging segments.
* @q: the request queue for the device
}
EXPORT_SYMBOL(elv_bio_merge_ok);
-static inline bool elv_support_features(struct request_queue *q,
- const struct elevator_type *e)
-{
- return (q->required_elevator_features & e->elevator_features) ==
- q->required_elevator_features;
-}
-
/**
* elevator_match - Check whether @e's name or alias matches @name
* @e: Scheduler to test
spin_lock(&elv_list_lock);
e = __elevator_find(name);
- if (e && (!elv_support_features(q, e) || !elevator_tryget(e)))
+ if (e && (!elevator_tryget(e)))
e = NULL;
spin_unlock(&elv_list_lock);
return e;
}
/*
- * Get the first elevator providing the features required by the request queue.
- * Default to "none" if no matching elevator is found.
- */
-static struct elevator_type *elevator_get_by_features(struct request_queue *q)
-{
- struct elevator_type *e, *found = NULL;
-
- spin_lock(&elv_list_lock);
-
- list_for_each_entry(e, &elv_list, list) {
- if (elv_support_features(q, e)) {
- found = e;
- break;
- }
- }
-
- if (found && !elevator_tryget(found))
- found = NULL;
-
- spin_unlock(&elv_list_lock);
- return found;
-}
-
-/*
- * For a device queue that has no required features, use the default elevator
- * settings. Otherwise, use the first elevator available matching the required
- * features. If no suitable elevator is find or if the chosen elevator
- * initialization fails, fall back to the "none" elevator (no elevator).
+ * Use the default elevator settings. If the chosen elevator initialization
+ * fails, fall back to the "none" elevator (no elevator).
*/
void elevator_init_mq(struct request_queue *q)
{
if (unlikely(q->elevator))
return;
- if (!q->required_elevator_features)
- e = elevator_get_default(q);
- else
- e = elevator_get_by_features(q);
+ e = elevator_get_default(q);
if (!e)
return;
list_for_each_entry(e, &elv_list, list) {
if (e == cur)
len += sprintf(name+len, "[%s] ", e->elevator_name);
- else if (elv_support_features(q, e))
+ else
len += sprintf(name+len, "%s ", e->elevator_name);
}
spin_unlock(&elv_list_lock);
atomic_t nr_active_requests_shared_tags;
- unsigned int required_elevator_features;
-
struct blk_mq_tags *sched_shared_tags;
struct list_head icq_list;
void disk_set_independent_access_ranges(struct gendisk *disk,
struct blk_independent_access_ranges *iars);
-/*
- * Elevator features for blk_queue_required_elevator_features:
- */
-/* Supports zoned block devices sequential write constraint */
-#define ELEVATOR_F_ZBD_SEQ_WRITE (1U << 0)
-
-extern void blk_queue_required_elevator_features(struct request_queue *q,
- unsigned int features);
extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
struct device *dev);