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Subject[PATCH 13/16] block: add a blk_account_io_merge_bio helper
Date
From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>

Move the non-"new_io" branch of blk_account_io_start() into separate
function. Fix merge accounting for discards (they were counted as write
merges).

The new blk_account_io_merge_bio() doesn't call update_io_ticks() unlike
blk_account_io_start(), as there is no reason for that.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
[hch: rebased]
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/blk-core.c | 25 ++++++++++++++++---------
block/blk-exec.c | 2 +-
block/blk-mq.c | 2 +-
block/blk.h | 2 +-
4 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index c1675d43c2da0..bf2f7d4bc0c1c 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -636,6 +636,16 @@ void blk_put_request(struct request *req)
}
EXPORT_SYMBOL(blk_put_request);

+static void blk_account_io_merge_bio(struct request *req)
+{
+ if (!blk_do_io_stat(req))
+ return;
+
+ part_stat_lock();
+ part_stat_inc(req->part, merges[op_stat_group(req_op(req))]);
+ part_stat_unlock();
+}
+
bool bio_attempt_back_merge(struct request *req, struct bio *bio,
unsigned int nr_segs)
{
@@ -656,7 +666,7 @@ bool bio_attempt_back_merge(struct request *req, struct bio *bio,

bio_crypt_free_ctx(bio);

- blk_account_io_start(req, false);
+ blk_account_io_merge_bio(req);
return true;
}

@@ -682,7 +692,7 @@ bool bio_attempt_front_merge(struct request *req, struct bio *bio,

bio_crypt_do_front_merge(req, bio);

- blk_account_io_start(req, false);
+ blk_account_io_merge_bio(req);
return true;
}

@@ -704,7 +714,7 @@ bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
req->__data_len += bio->bi_iter.bi_size;
req->nr_phys_segments = segments + 1;

- blk_account_io_start(req, false);
+ blk_account_io_merge_bio(req);
return true;
no_merge:
req_set_nomerge(q, req);
@@ -1329,7 +1339,7 @@ blk_status_t blk_insert_cloned_request(struct request_queue *q, struct request *
return BLK_STS_IOERR;

if (blk_queue_io_stat(q))
- blk_account_io_start(rq, true);
+ blk_account_io_start(rq);

/*
* Since we have a scheduler attached on the top device,
@@ -1433,16 +1443,13 @@ void blk_account_io_done(struct request *req, u64 now)
}
}

-void blk_account_io_start(struct request *rq, bool new_io)
+void blk_account_io_start(struct request *rq)
{
if (!blk_do_io_stat(rq))
return;

part_stat_lock();
- if (!new_io)
- part_stat_inc(rq->part, merges[rq_data_dir(rq)]);
- else
- rq->part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq));
+ rq->part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq));
update_io_ticks(rq->part, jiffies, false);
part_stat_unlock();
}
diff --git a/block/blk-exec.c b/block/blk-exec.c
index e20a852ae432d..85324d53d072f 100644
--- a/block/blk-exec.c
+++ b/block/blk-exec.c
@@ -55,7 +55,7 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
rq->rq_disk = bd_disk;
rq->end_io = done;

- blk_account_io_start(rq, true);
+ blk_account_io_start(rq);

/*
* don't check dying flag for MQ because the request won't
diff --git a/block/blk-mq.c b/block/blk-mq.c
index cac11945f6023..c606c74463ccd 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1822,7 +1822,7 @@ static void blk_mq_bio_to_request(struct request *rq, struct bio *bio,
blk_rq_bio_prep(rq, bio, nr_segs);
blk_crypto_rq_bio_prep(rq, bio, GFP_NOIO);

- blk_account_io_start(rq, true);
+ blk_account_io_start(rq);
}

static blk_status_t __blk_mq_issue_directly(struct blk_mq_hw_ctx *hctx,
diff --git a/block/blk.h b/block/blk.h
index 0ecba2ab383d6..428f7e5d70a86 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -185,7 +185,7 @@ bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
unsigned int nr_segs, struct request **same_queue_rq);

-void blk_account_io_start(struct request *req, bool new_io);
+void blk_account_io_start(struct request *req);
void blk_account_io_done(struct request *req, u64 now);

/*
--
2.26.2
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