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 E3352353A82; Wed, 9 Sep 2026 14:17:30 +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=1788963452; cv=none; b=tXMVnwxb8jChdylrewcxnb+nzwxB4H660gWT3jSu97pQi0c8FUdyCv7la+OXwUqoBGZWbJt90f/jbdSyspYlPy37Ca4jP9T8mF5pgNArDij2ll3ZJMZAPiflRkejvCmrK3zN8erJVaPUm40/ympOGNz4GEFGh/tlLk8eXVm/h3c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788963452; c=relaxed/simple; bh=Uuy3qIucldebEYTrWDHvPp8mWt/Oyq7FJRCda457to4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KSE1n0hVAZMg+N/qzAEjputq8VvqUQiXf08D3rRRlDDVxJFVvTHVQLuGC9Hts+b1Ow01lO64b7LkDozfZ8oG71H3qiBg3WXpgd4HjaurDeb3LC55aubRoe4vKw6i67JDOgiIhdi+GMlnYPmhiYfZsIFDSKihU5L/uVzwwUbMTdo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=AtqRBLlz; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="AtqRBLlz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 15DE51F00A3A; Wed, 9 Sep 2026 14:17:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788963450; bh=v0xYVnXl22/D1gaRYKRjYPTYDplnFb9wfFg/6nht0jI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=AtqRBLlzassdRkRY4rWP+VITmlEkNUenfw+M3aDxyOkTPUwopS1gqcAXts27M4w3H jy9mVO+DWp7Fe0IcraNCm02PCYfMzTPXbMx3/HwQ5BiAI4/eNbg8Drxc57w/p9nH+y cQqWyYeCi93bybMKIVdpAO0AsRSyLIC6wjF/S3Pg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Damien Le Moal , Bart Van Assche , Hannes Reinecke , Christoph Hellwig , Hannes Reinecke , Jens Axboe Subject: [PATCH 6.18 076/583] block: flag zoned disks with GENHD_FL_NO_PART Date: Wed, 9 Sep 2026 15:36:01 +0200 Message-ID: <20260909134240.719573249@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260909134237.773280130@linuxfoundation.org> References: <20260909134237.773280130@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Damien Le Moal commit 3f9c7a108c0e8f14425384912017071b71341e3b upstream. 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 Reviewed-by: Hannes Reinecke Link: https://patch.msgid.link/20260831025050.667758-1-dlemoal@kernel.org Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- block/genhd.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/block/genhd.c +++ b/block/genhd.c @@ -448,6 +448,13 @@ static int __add_disk(struct device *par } /* + * 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 * setup the gendisk.