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blk-stat: convert blk-stat bucket callback to signed

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In order to allow for filtering of IO based on some other properties
of the request than direction we allow the bucket function to return
an int.

If the bucket callback returns a negative do no count it in the stats
accumulation.

Signed-off-by: Stephen Bates <[email protected]>

Fixed up Kyber scheduler stat callback.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Stephen Bates 2017-04-20 15:29:16 -06:00 • committed by Jens Axboe
commit a37244e4cc
3 changed files with 10 additions and 7 deletions
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9
block/blk-stat.h
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@ -48,9 +48,10 @@ struct blk_stat_callback {
/**
* @bucket_fn: Given a request, returns which statistics bucket it
* should be accounted under.
* should be accounted under. Return -1 for no bucket for this
* request.
*/
unsigned int (*bucket_fn)(const struct request *);
int (*bucket_fn)(const struct request *);
/**
* @buckets: Number of statistics buckets.
@ -120,7 +121,7 @@ void blk_stat_enable_accounting(struct request_queue *q);
*
* Return: Data direction of the request, either READ or WRITE.
*/
unsigned int blk_stat_rq_ddir(const struct request *rq);
int blk_stat_rq_ddir(const struct request *rq);
/**
* blk_stat_alloc_callback() - Allocate a block statistics callback.
@ -135,7 +136,7 @@ unsigned int blk_stat_rq_ddir(const struct request *rq);
*/
struct blk_stat_callback *
blk_stat_alloc_callback(void (*timer_fn)(struct blk_stat_callback *),
unsigned int (*bucket_fn)(const struct request *),
int (*bucket_fn)(const struct request *),
unsigned int buckets, void *data);
/**