block: split tag and sysfs handling from blk-core.c

# Makefile for the kernel block layer

#

obj-$(CONFIG_BLOCK) := elevator.o blk-core.o ioctl.o genhd.o scsi_ioctl.o

obj-$(CONFIG_BLOCK) := elevator.o blk-core.o blk-tag.o blk-sysfs.o ioctl.o \

			genhd.o scsi_ioctl.o

obj-$(CONFIG_BLK_DEV_BSG)	+= bsg.o

obj-$(CONFIG_IOSCHED_NOOP)	+= noop-iosched.o

#ifndef BLK_INTERNAL_H

#define BLK_INTERNAL_H

extern struct kmem_cache *blk_requestq_cachep;

extern struct kobj_type blk_queue_ktype;

void __blk_queue_free_tags(struct request_queue *q);

void blk_queue_congestion_threshold(struct request_queue *q);

/*

 * Return the threshold (number of used requests) at which the queue is

 * considered to be congested.  It include a little hysteresis to keep the

 * context switch rate down.

 */

static inline int queue_congestion_on_threshold(struct request_queue *q)

{

	return q->nr_congestion_on;

}

/*

 * The threshold at which a queue is considered to be uncongested

 */

static inline int queue_congestion_off_threshold(struct request_queue *q)

{

	return q->nr_congestion_off;

}

#endif