linux-kernel - [PATCH 1/4] block: export part_in

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Message-Id: <20250412073202.3085138-2-yukuai1@huaweicloud.com>
Date: Sat, 12 Apr 2025 15:31:59 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: axboe@...nel.dk,
	song@...nel.org,
	yukuai3@...wei.com,
	xni@...hat.com
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH 1/4] block: export part_in_flight()

From: Yu Kuai <yukuai3@...wei.com>

This helper will be used in mdraid in later patches, check if there
are normal IO inflight while generating background sync IO, to fix a
problem in mdraid that foreground IO can be starved by background sync
IO.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 block/blk.h               | 1 -
 block/genhd.c             | 1 +
 include/linux/part_stat.h | 1 +
 3 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/blk.h b/block/blk.h
index 006e3be433d2..f476f233f195 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -418,7 +418,6 @@ void blk_apply_bdi_limits(struct backing_dev_info *bdi,
 int blk_dev_init(void);
 
 void update_io_ticks(struct block_device *part, unsigned long now, bool end);
-unsigned int part_in_flight(struct block_device *part);
 
 static inline void req_set_nomerge(struct request_queue *q, struct request *req)
 {
diff --git a/block/genhd.c b/block/genhd.c
index c2bd86cd09de..5b408d9b5a9d 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -139,6 +139,7 @@ unsigned int part_in_flight(struct block_device *part)
 
 	return inflight;
 }
+EXPORT_SYMBOL_GPL(part_in_flight);
 
 static void part_in_flight_rw(struct block_device *part,
 		unsigned int inflight[2])
diff --git a/include/linux/part_stat.h b/include/linux/part_stat.h
index c5e9cac0575e..79ed730a8d50 100644
--- a/include/linux/part_stat.h
+++ b/include/linux/part_stat.h
@@ -79,4 +79,5 @@ static inline void part_stat_set_all(struct block_device *part, int value)
 #define part_stat_local_read_cpu(part, field, cpu)			\
 	local_read(&(part_stat_get_cpu(part, field, cpu)))
 
+unsigned int part_in_flight(struct block_device *part);
 #endif /* _LINUX_PART_STAT_H */
-- 
2.39.2