cregit-Linux how code gets into the kernel

Release 4.7 block/blk-mq-tag.h

Directory: block
#ifndef INT_BLK_MQ_TAG_H

#define INT_BLK_MQ_TAG_H

#include "blk-mq.h"

enum {
	
BT_WAIT_QUEUES	= 8,
	
BT_WAIT_BATCH	= 8,
};


struct bt_wait_state {
	
atomic_t wait_cnt;
	
wait_queue_head_t wait;
} 
____cacheline_aligned_in_smp;


#define TAG_TO_INDEX(bt, tag)	((tag) >> (bt)->bits_per_word)

#define TAG_TO_BIT(bt, tag)	((tag) & ((1 << (bt)->bits_per_word) - 1))


struct blk_mq_bitmap_tags {
	
unsigned int depth;
	
unsigned int wake_cnt;
	
unsigned int bits_per_word;

	
unsigned int map_nr;
	
struct blk_align_bitmap *map;

	
atomic_t wake_index;
	
struct bt_wait_state *bs;
};

/*
 * Tag address space map.
 */

struct blk_mq_tags {
	
unsigned int nr_tags;
	
unsigned int nr_reserved_tags;

	
atomic_t active_queues;

	
struct blk_mq_bitmap_tags bitmap_tags;
	
struct blk_mq_bitmap_tags breserved_tags;

	
struct request **rqs;
	
struct list_head page_list;

	
int alloc_policy;
	
cpumask_var_t cpumask;
};


extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
extern void blk_mq_free_tags(struct blk_mq_tags *tags);

extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, unsigned int tag, unsigned int *last_tag);
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);
extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag);
extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
		void *priv);

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,
};

extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);


static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx) { if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) return false; return __blk_mq_tag_busy(hctx); }

Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe32100.00%1100.00%
Total32100.00%1100.00%


static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx) { if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) return; __blk_mq_tag_idle(hctx); }

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jens axboejens axboe29100.00%1100.00%
Total29100.00%1100.00%

/* * This helper should only be used for flush request to share tag * with the request cloned from, and both the two requests can't be * in flight at the same time. The caller has to make sure the tag * can't be freed. */
static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx, unsigned int tag, struct request *rq) { hctx->tags->rqs[tag] = rq; }

Contributors

PersonTokensPropCommitsCommitProp
ming leiming lei32100.00%1100.00%
Total32100.00%1100.00%

#endif

Overall Contributors

PersonTokensPropCommitsCommitProp
jens axboejens axboe32278.35%750.00%
christoph hellwigchristoph hellwig4410.71%214.29%
ming leiming lei338.03%17.14%
shaohua lishaohua li61.46%17.14%
keith buschkeith busch30.73%17.14%
lei minglei ming20.49%17.14%
alexander gordeevalexander gordeev10.24%17.14%
Total411100.00%14100.00%
Directory: block
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