From nobody Mon Jun 8 06:36:41 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 845834C8FF4; Fri, 5 Jun 2026 09:15:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780650939; cv=none; b=jRONjEbxK/EJCgjK6T/fbTmys3a1YdxknTBvNF/LWFlNFyHNO6kFQJ1WLvxn7j1YgWQv7M3wBTYB0z2tpgstZqlav2Sw3ysW/+ewfrls0sr+MCiAwm4NuC5jQRWPop0fcJ3XAtLmlY7Pr3kff9a55+e/mSp62/EGPz8QiRxTDAc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780650939; c=relaxed/simple; bh=H/YLx7PHu6y5NVTN8GtypqwctsztozZMmIX56coQu0k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nFyPvMBUZo4hNRPKUU6xFjmEH8X7eZluYUnz9zQLBIL4Gt4db7y5bX85IUobMO1PT1W+9sqv3ghHcaS3be9t0sAOIyGyTMY1H3zaw7fvuiIvIlK7aODFe76Avr8nhNdRQSMtYfxpxisH3HC0FUhDWivwif9awjcWjP/p41mYViw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ytz/yut0; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Ytz/yut0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9390B1F00898; Fri, 5 Jun 2026 09:15:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780650938; bh=p4GUMKOh4UGR2mZ5bB/PqTNFE+i8KYfzhMk7jCgOsp8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Ytz/yut090ml+ibvuRxPrFgyMSkR9Ara3Vn98BvcXX5+jdrKLlEEtVpIhLXVZdr6q EpkPkDLAvlvuy3M2XdHtsGitellPwXEceQK1Df8GUEUle+ACmtMmLHqfCMvyHUjJvh moGUnVaCAXw6kVlrUYHSkNl2PnstNFTwlbIeoHHCeBqt08tejfvGpgFAPN+6YfCMgA DRz7fSYGCQklqqkmpmHzXvelByZT9XOgiIfeJiG5OYr3diz0JorrEMYai1cY9rKrTR LHgLswhzCLbFqMlaZcdN7Dx/8MJweOIwPiogaZbehsZmHN7t77w5vavB655FRExwr0 3G9jLZjEohJzw== From: Yu Kuai To: Song Liu , Yu Kuai Cc: Li Nan , Xiao Ni , linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] md: add helper to split bios at reshape offset Date: Fri, 5 Jun 2026 17:15:10 +0800 Message-ID: <20260605091527.2463539-4-yukuai@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260605091527.2463539-1-yukuai@kernel.org> References: <20260605091527.2463539-1-yukuai@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Yu Kuai Add mddev_bio_split_at_reshape_offset() so personalities can share reshape-offset bio splitting instead of open-coding the same helper in multiple places. Signed-off-by: Yu Kuai --- drivers/md/md.c | 39 +++++++++++++++++++++++++++++++++++++++ drivers/md/md.h | 4 ++++ 2 files changed, 43 insertions(+) diff --git a/drivers/md/md.c b/drivers/md/md.c index ccc4180d2c1d..6685e4c53fd9 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -9359,10 +9359,49 @@ void md_submit_discard_bio(struct mddev *mddev, str= uct md_rdev *rdev, mddev_trace_remap(mddev, discard_bio, bio->bi_iter.bi_sector); submit_bio_noacct(discard_bio); } EXPORT_SYMBOL_GPL(md_submit_discard_bio); =20 +struct bio *mddev_bio_split_at_reshape_offset(struct mddev *mddev, + struct bio *bio, + unsigned int *max_sectors, + struct bio_set *bs) +{ + sector_t boundary; + sector_t start; + sector_t end; + unsigned int split_sectors; + + split_sectors =3D bio_sectors(bio); + if (max_sectors && *max_sectors && *max_sectors < split_sectors) + split_sectors =3D *max_sectors; + + if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) + goto split; + + boundary =3D mddev->reshape_position; + start =3D bio->bi_iter.bi_sector; + end =3D bio_end_sector(bio); + if (start >=3D boundary || end <=3D boundary) + goto split; + + if (boundary - start < split_sectors) + split_sectors =3D boundary - start; + +split: + if (max_sectors) + *max_sectors =3D split_sectors; + if (split_sectors < bio_sectors(bio)) { + bio =3D bio_submit_split_bioset(bio, split_sectors, bs); + if (bio) + bio->bi_opf |=3D REQ_NOMERGE; + } + + return bio; +} +EXPORT_SYMBOL_GPL(mddev_bio_split_at_reshape_offset); + static void md_bitmap_prepare_range(struct mddev *mddev, sector_t *offset, unsigned long *sectors) { mddev->bitmap_ops->prepare_range(mddev, offset, sectors); } diff --git a/drivers/md/md.h b/drivers/md/md.h index 110cf0f8b107..ebfc6da83161 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -923,10 +923,14 @@ extern void md_done_sync(struct mddev *mddev, int blo= cks); extern void md_sync_error(struct mddev *mddev); extern void md_error(struct mddev *mddev, struct md_rdev *rdev); extern void md_finish_reshape(struct mddev *mddev); void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev, struct bio *bio, sector_t start, sector_t size); +struct bio *mddev_bio_split_at_reshape_offset(struct mddev *mddev, + struct bio *bio, + unsigned int *max_sectors, + struct bio_set *bs); void md_account_bio(struct mddev *mddev, struct bio **bio); =20 extern bool __must_check md_flush_request(struct mddev *mddev, struct bio = *bio); void md_write_metadata(struct mddev *mddev, struct md_rdev *rdev, sector_t sector, int size, struct page *page, --=20 2.51.0