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block: account merge of two requests

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Also rename blk_account_io_merge() into blk_account_io_merge_request() to
distinguish it from merging request and bio.

[hch: rebased]

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Konstantin Khlebnikov 2020-05-27 07:24:15 +02:00 committed by Jens Axboe
parent 58d4f14fc3
commit b9c54f5660
1 changed files with 5 additions and 7 deletions
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12
block/blk-merge.c
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@ -669,18 +669,16 @@ void blk_rq_set_mixed_merge(struct request *rq)
rq->rq_flags |= RQF_MIXED_MERGE; rq->rq_flags |= RQF_MIXED_MERGE;
} }
static void blk_account_io_merge(struct request *req) static void blk_account_io_merge_request(struct request *req)
{ {
if (blk_do_io_stat(req)) { if (blk_do_io_stat(req)) {
struct hd_struct *part;
part_stat_lock(); part_stat_lock();
part = req->part; part_stat_inc(req->part, merges[op_stat_group(req_op(req))]);
hd_struct_put(req->part);
hd_struct_put(part);
part_stat_unlock(); part_stat_unlock();
} }
} }
/* /*
* Two cases of handling DISCARD merge: * Two cases of handling DISCARD merge:
* If max_discard_segments > 1, the driver takes every bio * If max_discard_segments > 1, the driver takes every bio
@ -792,7 +790,7 @@ static struct request *attempt_merge(struct request_queue *q,
/* /*
* 'next' is going away, so update stats accordingly * 'next' is going away, so update stats accordingly
*/ */
blk_account_io_merge(next); blk_account_io_merge_request(next);
/* /*
* ownership of bio passed from next to req, return 'next' for * ownership of bio passed from next to req, return 'next' for