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 D912C274B46; Sat, 12 Sep 2026 18:23:43 +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=1789237425; cv=none; b=DqDPc7UlyuVoBmNxQVbCHP34q3YJYpmWxU5AMgbxYIVE+0eSepo/DHTzOMtzLgF+Sln6jao+olfc0Ilr/FTX/k0Q0roksMqfR1XRgl8BGpfgjvQN+GF6HgXgJVrj3a/Lb1IH4cMR7maFMMzsIwRm5AQPlTi1TVAvagiAlKIGOps= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789237425; c=relaxed/simple; bh=o1kVb+XTlkPnuGKTATHhqc9Ox/zhgpAXbhYabMqN2NE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nozN5jhMH7VxFWl/GYMpdmlQctfR9yuCzkC/T6xecLt/V8PukMakOxAxdoKFVUqvV71qypLImBlCwhYNZLCuCyqV3bcmuP3pUkC+7R6jUhrb12/t43h7g71wQI+oj7L+2IKyOLenvqgrZIrCO7AJGsY8QNu73J3VYbgqdidQ0OM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=SO69OtH3; 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="SO69OtH3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D9EA11F000FF; Sat, 12 Sep 2026 18:23:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789237423; bh=/IaH+4s5RGLI00StPo65s6g8KQAEszd5YDAalza01vc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=SO69OtH3OVXZWx1oZfrzysMrT5uGuflRVCKZYsPpxKiZdNm/8QH9djdai+cZXnFBh 9zvk8nnJc+7gG6OMtFBBqbPecuYwevpmbjysHT/gou1FgUoEh7cIli2GzsT6yfxzim GBpva7eu6549W7FSveJ6Pzu83S4V7hr+fVLL5Oms= 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 5.15 254/935] block: flag zoned disks with GENHD_FL_NO_PART Date: Sat, 12 Sep 2026 08:54:44 +0200 Message-ID: <20260912065532.652957771@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065526.833703348@linuxfoundation.org> References: <20260912065526.833703348@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 5.15-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 @@ -465,6 +465,13 @@ int device_add_disk(struct device *paren } /* + * 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; + + /* * avoid probable deadlock caused by allocating memory with * GFP_KERNEL in runtime_resume callback of its all ancestor * devices