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 2BD882AD3C; Sat, 12 Sep 2026 15:46:24 +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=1789227985; cv=none; b=FpgCi081a7zQphJCai+I3X3rBh2/hRNxF76u5OTO39+/8Hvg1H6s3AJISMgFtdhf3eEWdyh3KQjehIVoKANYsG53YOSe8pMw4z8LbL+vDlZDBz415pQM+GyN/adAR34PAAuE39zhRgS6tq5fwWHHdSpkhHpBkrs8VRBccRxa144= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789227985; c=relaxed/simple; bh=0vBHWv+5ler9ZhJvMf9m1h2VIUOt8xjSEV1VFFEpXvk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ASrETA5+DbKoMNDcYkn104APnWCmKc2EMOU0HYKAgrn/Ux/zFMj9b98M4rW0W4cyDDCILVBhOErq5xe/EFr2a/lHeG1Bk/iK8ww8xRk5uC4kSYDsE1D0NeZ83eQt+ghFgVGKGxkmrWrgrWd2R7dzX15pXo2FuaWsW6GKuKMcJA4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=HS5XOi+T; 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="HS5XOi+T" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 177431F000FF; Sat, 12 Sep 2026 15:46:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789227984; bh=sWIAUJOlRyLyHd5fVFGSG/hMqhkIH09YdKDpr1pNyLQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=HS5XOi+TBTJPxSalba7GfHatq2vXR3N6zCO7gdy4LLCrUi87MWuZTncPNr5PB2dfy tp/uoAxvidRYI6u66lHnWYew0ePI1I+gWU86XOLRLkyKn7cMNC2nUTkBW25MuPm7Xl tFDu1/ZKX9bWr+4eZDG3xvHQYOxygprs7TVFD39E= 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 6.1 0294/1191] block: flag zoned disks with GENHD_FL_NO_PART Date: Sat, 12 Sep 2026 08:50:22 +0200 Message-ID: <20260912065554.833950879@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065548.086904252@linuxfoundation.org> References: <20260912065548.086904252@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 6.1-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 @@ -428,6 +428,13 @@ int __must_check device_add_disk(struct elevator_init_mq(disk->queue); /* + * 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.