24d2f90309
Add a new blk_mq_tag_set structure that gets set up before we initialize
the queue. A single blk_mq_tag_set structure can be shared by multiple
queues.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Modular export of blk_mq_{alloc,free}_tagset added by me.
Signed-off-by: Jens Axboe <axboe@fb.com>
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
#ifndef INT_BLK_MQ_TAG_H
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#define INT_BLK_MQ_TAG_H
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#include <linux/percpu_ida.h>
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/*
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* Tag address space map.
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*/
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struct blk_mq_tags {
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unsigned int nr_tags;
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unsigned int nr_reserved_tags;
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unsigned int nr_batch_move;
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unsigned int nr_max_cache;
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struct percpu_ida free_tags;
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struct percpu_ida reserved_tags;
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struct request **rqs;
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struct list_head page_list;
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};
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extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node);
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extern void blk_mq_free_tags(struct blk_mq_tags *tags);
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extern unsigned int blk_mq_get_tag(struct blk_mq_tags *tags, gfp_t gfp, bool reserved);
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extern void blk_mq_wait_for_tags(struct blk_mq_tags *tags);
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extern void blk_mq_put_tag(struct blk_mq_tags *tags, unsigned int tag);
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extern void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data);
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extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
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extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
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enum {
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BLK_MQ_TAG_CACHE_MIN = 1,
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BLK_MQ_TAG_CACHE_MAX = 64,
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};
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enum {
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BLK_MQ_TAG_FAIL = -1U,
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BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
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BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
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};
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#endif
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