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 792F628F935; Sun, 19 Apr 2026 03:10:20 +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=1776568220; cv=none; b=nr2LWUSUb5XQQFrHVTlF99WUhYM9T8/1TmInt+1/7YhTWE0XJX+oV+d8WdoQzhcoVG6vOcwpj/QLhoQTPZdupqYX0/Kr+lOZ86+lXbBKFjM11ql0OVm6nHAgMIO/4FeTNhrSQjLPfu+YsrG2JfBXr9QzqoDr801qB+r09LckcUQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776568220; c=relaxed/simple; bh=UO2R+idYWvdfy++CVnG8KPItNQjLoNmlfx1LXf5zPP0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JkkP3lIbe8yVNq5f9clc2r9HzbZNYVGp0y0LA9dudpZe4lpVnungpJifd+zIItb2Unxs5QYkrQMVWXYze6ZHsgi5e5aAeCsgZKbLd/CBUpOHo2Dc8oA0vXG7JEDThdZzmzv0ZuEpNeGUibwABpcfl1gVdfD17zkPVdby9FD8Wfw= 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 688F3C2BCB6; Sun, 19 Apr 2026 03:10:18 +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/raid10: reject llbitmap chunk shrink during reshape Date: Sun, 19 Apr 2026 11:09:36 +0800 Message-ID: <20260419030942.824195-14-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 llbitmap reshape keeps one live bitmap and only supports growing the tracked chunk geometry. Reject RAID10 reshape attempts that would shrink the llbitmap chunk size. Signed-off-by: Yu Kuai --- drivers/md/raid10.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 4901ebe45c87..ad19257c79fb 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -4260,6 +4260,10 @@ static int raid10_check_reshape(struct mddev *mddev) if (conf->geo.far_copies != 1 && !conf->geo.far_offset) return -EINVAL; + if (mddev->bitmap_id == ID_LLBITMAP && + mddev->new_chunk_sectors && + mddev->new_chunk_sectors < mddev->chunk_sectors) + return -EOPNOTSUPP; if (setup_geo(&geo, mddev, geo_start) != conf->copies) /* mustn't change number of copies */ -- 2.51.0