From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 99A7A28469F; Sun, 19 Apr 2026 03:09:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776568198; cv=none; b=um8IWJp52YxD9Zm9237ZoKmxC3CseccksYWl8DFZ3GJn6RY/GKEJAv1Lq3BzT9E7ejrs8XttVG1HXq72fUFv8QTr4RLNZUyPHXgW6BNhG+BrAICprTh+u1DSEXRIg9donY656iKNklXDnvNR1XhqOyfd02TRIinZzWTkfqcnlvw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776568198; c=relaxed/simple; bh=7j1gsBpFJ2opygpiuVHAnTd5YKq/Lp2KHGY7Kue0Nk8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PY/mEytz/yDONo7jtBMdvkn40AHv0q13b2G2sC9p8c94u3YIJfnjk4gXU7erXhuHi5zqVdiXQ7aJ/2ab7MWR+1+WmKxGbn8i4GdX+IsklFbLCpEhoKOeGHLl1yNS/WP77Zk+A+AqvXhWdl+Xj+hillvz8USs4FQGRvl2l/Z8trw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id EF6E4C4AF09; Sun, 19 Apr 2026 03:09:56 +0000 (UTC) From: Yu Kuai To: linux-raid@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Li Nan , Yu Kuai , Cheng Cheng Subject: [PATCH] md: add helper to split bios at reshape offset Date: Sun, 19 Apr 2026 11:09:25 +0800 Message-ID: <20260419030942.824195-3-yukuai@fnnas.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260419030942.824195-1-yukuai@fnnas.com> References: <20260419030942.824195-1-yukuai@fnnas.com> Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 5b001e3e4cec..d222e365141b 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -9301,6 +9301,45 @@ void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev, } EXPORT_SYMBOL_GPL(md_submit_discard_bio); +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 = bio_sectors(bio); + if (max_sectors && *max_sectors && *max_sectors < split_sectors) + split_sectors = *max_sectors; + + if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) + goto split; + + boundary = mddev->reshape_position; + start = bio->bi_iter.bi_sector; + end = bio_end_sector(bio); + if (start >= boundary || end <= boundary) + goto split; + + if (boundary - start < split_sectors) + split_sectors = boundary - start; + +split: + if (max_sectors) + *max_sectors = split_sectors; + if (split_sectors < bio_sectors(bio)) { + bio = bio_submit_split_bioset(bio, split_sectors, bs); + if (bio) + bio->bi_opf |= 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) { diff --git a/drivers/md/md.h b/drivers/md/md.h index 82a36bdaeaaa..7247eeca5aa4 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -920,6 +920,10 @@ 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); void md_free_cloned_bio(struct bio *bio); -- 2.51.0