From mboxrd@z Thu Jan 1 00:00:00 1970 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 CF043344031 for ; Fri, 14 Aug 2026 13:48:11 +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=1786715293; cv=none; b=HbEYejOzCJ+BCbWVQcYhrpiIkoStEbkVzPhKFcFMJliHvZT6+DOBFhIHpYO+Apu4A4nrQOk1qYXGJInEcKYjjI/q+Rkr+wsxfpGnS5ByAseLupXGhzildXsG28gbbPPCVJ8UJqG1Cr2XaMe99t5Za3oiVoS8B4/o2ij1pAwfRoI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786715293; c=relaxed/simple; bh=5+Ph6Vj3Jpd4WBHfZVK2laoMJWRuKXNHr+lDnMRx8Oc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Qss+WdWYgOHaZrBuME0MZaYnYHBPIRhqx6nq9fcjSaJEIGwRAFGC/Wue6qFgxkPu1mmiYIptu3Uc8zwpuYXyUljeDJjVydfIB76dstH3D6JBt+naam8YiM9JBy1cYmH+cRYtwFAjapidJWdbWLKYpa3klOykoTMSBULg6Ua3faw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dOtbKibX; 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="dOtbKibX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4BF971F000E9; Fri, 14 Aug 2026 13:48:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786715291; bh=Pn6vCiK6QRt7ZS15aKx1WahmpjUk7Aun9FTZL4Mn0DI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=dOtbKibXMajE2ohaNtbET8Idr5d+iMcuMTIHPdY0w8tYyXNMw6fiMqTl1IchdFPSi oUgb2X68gleeiMU6Hs4ccbxZKPFmsnGGHDINtSvkYPDyzFGO4h6GGstR3WOFMZCi+0 PQTFFKmo/U4luMyU9BNO9ghTczbz7YXq7ZSeIpusWVTwdDNcoPLWxhEcCtFhhB0sqV wFE7JM9yH9WJ9ETqoalpvs2xOAF3o0zcPFj+CYzS/UE5KzPQN+9gGu6lqW+lDyeVgf oqDH3ICYzBR7XqEF3RAJJH2s4cXI4DXpnzbFkARgWvLI92QHNIaG90SjozwQC7Jmgt cZnFjAevhoq8g== From: Damien Le Moal To: Jens Axboe , linux-block@vger.kernel.org Cc: Christoph Hellwig Subject: [PATCH v5 13/13] block: flag zoned disks with GENHD_FL_NO_PART Date: Fri, 14 Aug 2026 22:47:50 +0900 Message-ID: <20260814134750.2100304-14-dlemoal@kernel.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260814134750.2100304-1-dlemoal@kernel.org> References: <20260814134750.2100304-1-dlemoal@kernel.org> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Zoned block devices do not support partitions. However, the partition table is nevertheless still inspected, and any partition found ignored with a warning in add_partition(). While this is generally not a problem, and in fact beneficial to the user as it indicates an invalid use of a zoned block device, scanning for a partition table on the device may result in issuing read operations to offline zones (e.g. after a disk head is depopulated for disks that support head management operations). Since partitions are ignored anyway, completely disable partition scanning for zoned gendisks by setting the flag GENHD_FL_NO_PART in __add_disk(). The existing check in add_partition() is left as-is to ensure that we still get a warning if for whatever reason, despite GENHD_FL_NO_PART, we still endup trying to add partitions. Flagging zoned disks with GENHD_FL_NO_PART also has the benefit to expose through sysfs the ext_range attribute with the value of 1 instead of the default DISK_MAX_PARTS, thus correctly advertizing the fact that zoned disks do not support partitions. Fixes: 5eac3eb30c9a ("block: Remove partition support for zoned block devices") Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal Reviewed-by: Bart Van Assche Reviewed-by: Hannes Reinecke Reviewed-by: Christoph Hellwig --- block/genhd.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/block/genhd.c b/block/genhd.c index e8ce0cabf392..34a64077ba02 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -447,6 +447,13 @@ static int __add_disk(struct device *parent, struct gendisk *disk, bdev_set_flag(disk->part0, BD_HAS_SUBMIT_BIO); } + /* + * We do not support partitions with zoned block devices, so do not try + * to scan the partitions table. + */ + if (blk_queue_is_zoned(disk->queue)) + disk->flags |= GENHD_FL_NO_PART; + /* * If the driver provides an explicit major number it also must provide * the number of minors numbers supported, and those will be used to -- 2.55.0