block/blk-mq-tag.h

   1 #ifndef INT_BLK_MQ_TAG_H
   2 #define INT_BLK_MQ_TAG_H
   3
   4 struct blk_mq_tags;
   5
   6 extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node);
   7 extern void blk_mq_free_tags(struct blk_mq_tags *tags);
   8
   9 extern unsigned int blk_mq_get_tag(struct blk_mq_tags *tags, gfp_t gfp, bool reserved);
  10 extern void blk_mq_wait_for_tags(struct blk_mq_tags *tags);
  11 extern void blk_mq_put_tag(struct blk_mq_tags *tags, unsigned int tag);
  12 extern void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data);
  13 extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
  14 extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
  15
  16 enum {
  17         BLK_MQ_TAG_CACHE_MIN    = 1,
  18         BLK_MQ_TAG_CACHE_MAX    = 64,
  19 };
  20
  21 enum {
  22         BLK_MQ_TAG_FAIL         = -1U,
  23         BLK_MQ_TAG_MIN          = BLK_MQ_TAG_CACHE_MIN,
  24         BLK_MQ_TAG_MAX          = BLK_MQ_TAG_FAIL - 1,
  25 };
  26
  27 #endif