diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/blk-mq.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 24b4160aeaad..af878597afb8 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -1252,4 +1252,44 @@ static inline int blk_rq_map_sg(struct request *rq, struct scatterlist *sglist) } void blk_dump_rq_flags(struct request *, char *); +/** + * blk_rq_passthrough_stats - check if this request should account stats + * @rq: request to check + * @q: the queue accumulating the stats + * + * Note, @q does not necessarily need to be the request_queue that provides + * @rq. + * + * Return: true if stats should be accounted. + */ +static inline bool blk_rq_passthrough_stats(struct request *rq, + struct request_queue *q) +{ + struct bio *bio = rq->bio; + + if (!blk_queue_passthrough_stat(q)) + return false; + + /* Requests without a bio do not transfer data. */ + if (!bio) + return false; + + /* + * Stats are accumulated in the bdev, so must have one attached to a + * bio to track stats. Most drivers do not set the bdev for passthrough + * requests, but nvme is one that will set it. + */ + if (!bio->bi_bdev) + return false; + + /* + * We don't know what a passthrough command does, but we know the + * payload size and data direction. Ensuring the size is aligned to the + * block size filters out most commands with payloads that don't + * represent sector access. + */ + if (blk_rq_bytes(rq) & (bdev_logical_block_size(bio->bi_bdev) - 1)) + return false; + return true; +} #endif /* BLK_MQ_H */ |