#ifndef INT_BLK_MQ_TAG_H
  #define INT_BLK_MQ_TAG_H
  
  struct blk_mq_tags;
  
  extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node);
  extern void blk_mq_free_tags(struct blk_mq_tags *tags);
  
  extern unsigned int blk_mq_get_tag(struct blk_mq_tags *tags, gfp_t gfp, bool reserved);
  extern void blk_mq_wait_for_tags(struct blk_mq_tags *tags);
  extern void blk_mq_put_tag(struct blk_mq_tags *tags, unsigned int tag);
  extern void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data);
  extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
  extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
  
  enum {
  	BLK_MQ_TAG_CACHE_MIN	= 1,
  	BLK_MQ_TAG_CACHE_MAX	= 64,
  };
  
  enum {
  	BLK_MQ_TAG_FAIL		= -1U,
  	BLK_MQ_TAG_MIN		= BLK_MQ_TAG_CACHE_MIN,
  	BLK_MQ_TAG_MAX		= BLK_MQ_TAG_FAIL - 1,
  };
  
  #endif