linux-kernel - [PATCH 4/7] md: add a helper md_config_align

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Message-ID: <20251121051406.1316884-6-yukuai@fnnas.com>
Date: Fri, 21 Nov 2025 13:14:03 +0800
From: Yu Kuai <yukuai@...as.com>
To: song@...nel.org,
	yukuai@...as.com
Cc: linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linan122@...wei.com,
	xni@...hat.com
Subject: [PATCH 4/7] md: add a helper md_config_align_limits()

This helper will be used by personalities that want to align bio to
io_opt to get best IO bandwidth.

Signed-off-by: Yu Kuai <yukuai@...as.com>
---
 drivers/md/md.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/md/md.h b/drivers/md/md.h
index 1ed90fd85ac4..c8190cf02701 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -1088,6 +1088,17 @@ static inline bool rdev_blocked(struct md_rdev *rdev)
 	return false;
 }
 
+static inline void md_config_align_limits(struct mddev *mddev,
+					  struct queue_limits *lim)
+{
+	if ((lim->max_hw_sectors << 9) < lim->io_opt)
+		lim->max_hw_sectors = lim->io_opt >> 9;
+	else
+		lim->max_hw_sectors = rounddown(lim->max_hw_sectors,
+						lim->io_opt >> 9);
+	mddev->bio_align_to_limits = true;
+}
+
 #define mddev_add_trace_msg(mddev, fmt, args...)			\
 do {									\
 	if (!mddev_is_dm(mddev))					\
-- 
2.51.0