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blk-mq: export blk_mq_tag_busy_iter 

Export the blk-mq in-flight tag iterator for driver consumption.
This is particularly useful in exception paths or SRSI where
in-flight IOs need to be cancelled and/or reissued. The NVMe driver
conversion will use this.

Signed-off-by: Sam Bradshaw <sbradshaw@micron.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
hifive-unleashed-5.1
Sam Bradshaw 2014-05-23 13:30:16 -06:00 committed by Jens Axboe
parent 07068d5b8e
commit edf866b380
3 changed files with 2 additions and 1 deletions
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1
block/blk-mq-tag.c
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@ -400,6 +400,7 @@ void blk_mq_tag_busy_iter(struct blk_mq_tags *tags,
fn(data, tag_map);
kfree(tag_map);
}
EXPORT_SYMBOL(blk_mq_tag_busy_iter);
static unsigned int bt_unused_tags(struct blk_mq_bitmap_tags *bt)
{

1
block/blk-mq-tag.h
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@ -51,7 +51,6 @@ extern void blk_mq_free_tags(struct blk_mq_tags *tags);
extern unsigned int blk_mq_get_tag(struct blk_mq_hw_ctx *hctx, unsigned int *last_tag, gfp_t gfp, bool reserved);
extern void blk_mq_wait_for_tags(struct blk_mq_hw_ctx *hctx, bool reserved);
extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, unsigned int tag, unsigned int *last_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);
extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag);

1
include/linux/blk-mq.h
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@ -181,6 +181,7 @@ void blk_mq_stop_hw_queues(struct request_queue *q);
void blk_mq_start_hw_queues(struct request_queue *q);
void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data);
/*
* Driver command data is immediately after the request. So subtract request