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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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6
block/blk-stat.c
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@ -19,7 +19,7 @@ struct blk_queue_stats {
bool enable_accounting;
};
unsigned int blk_stat_rq_ddir(const struct request *rq)
int blk_stat_rq_ddir(const struct request *rq)
{
return rq_data_dir(rq);
}
@ -104,6 +104,8 @@ void blk_stat_add(struct request *rq)
list_for_each_entry_rcu(cb, &q->stats->callbacks, list) {
if (blk_stat_is_active(cb)) {
bucket = cb->bucket_fn(rq);
if (bucket < 0)
continue;
stat = &this_cpu_ptr(cb->cpu_stat)[bucket];
__blk_stat_add(stat, value);
}
@ -135,7 +137,7 @@ static void blk_stat_timer_fn(unsigned long data)
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)
{
struct blk_stat_callback *cb;