5810d903fa
blk_mq_wait_for_tags() is only able to wait for "normal" tags, not reserved tags. Pass in which one we should attempt to get a tag for, so that waiting for reserved tags will work. Reserved tags are used for internal commands, which are usually serialized. Hence no waiting generally takes place, but we should ensure that it actually works if users need that functionality. Signed-off-by: Jens Axboe <axboe@fb.com>
44 lines
1.2 KiB
C
44 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, bool reserved);
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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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