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Commit edf866b3 authored by Sam Bradshaw's avatar Sam Bradshaw Committed by Jens Axboe
Browse files

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: default avatarSam Bradshaw <sbradshaw@micron.com>
Signed-off-by: default avatarMatias Bjørling <m@bjorling.me>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 07068d5b

block/blk-mq-tag.c

+1 −0
Original line number Diff line number Diff line
@@ -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)

{

block/blk-mq-tag.h

+0 −1
Original line number Diff line number Diff line
@@ -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);

include/linux/blk-mq.h

+1 −0
Original line number Diff line number Diff line
@@ -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