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blk-mq-tag: change busy_iter_fn to return whether to continue or not

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We have this functionality in sbitmap, but we don't export it in
blk-mq for users of the tags busy iteration. This can be useful
for stopping the iteration, if the caller doesn't need to find
more requests.

Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-11-08 10:24:07 -07:00
parent c28445fa06
commit 7baa85727d
10 changed files with 38 additions and 22 deletions
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4
include/linux/blk-mq.h
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@ -129,9 +129,9 @@ typedef int (init_request_fn)(struct blk_mq_tag_set *set, struct request *,
typedef void (exit_request_fn)(struct blk_mq_tag_set *set, struct request *,
unsigned int);
typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
typedef bool (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
bool);
typedef void (busy_tag_iter_fn)(struct request *, void *, bool);
typedef bool (busy_tag_iter_fn)(struct request *, void *, bool);
typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int);
typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
typedef bool (busy_fn)(struct request_queue *);