From patchwork Thu Nov 17 00:43:03 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Golle X-Patchwork-Id: 13045992 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41A1CC4332F for ; Thu, 17 Nov 2022 00:43:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233486AbiKQAne (ORCPT ); Wed, 16 Nov 2022 19:43:34 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36900 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234042AbiKQAnT (ORCPT ); Wed, 16 Nov 2022 19:43:19 -0500 Received: from fudo.makrotopia.org (fudo.makrotopia.org [IPv6:2a07:2ec0:3002::71]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 27EC964A1B; Wed, 16 Nov 2022 16:43:16 -0800 (PST) Received: from local by fudo.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.94.2) (envelope-from ) id 1ovSzk-0002VB-PV; Thu, 17 Nov 2022 01:43:08 +0100 Date: Thu, 17 Nov 2022 00:43:03 +0000 From: Daniel Golle To: Christoph Hellwig , Jens Axboe , "Martin K. Petersen" , Chaitanya Kulkarni , Wolfram Sang , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 2/4] block: add new flag to add partitions read-only Message-ID: <31b78b87ece4e095aa082d09ca3d4058a2484f3c.1668644705.git.daniel@makrotopia.org> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Add flag ADDPART_FLAG_READONLY to allow partition parsers marking a partition to be set read-only. This is needed for the uImage.FIT partition parser added by a follow-up commit: we need to be sure the contents of uImage.FIT sub-images remain unaltered they are validated using a hash within the uImage.FIT structure which also serves as partition table. Signed-off-by: Daniel Golle --- block/blk.h | 1 + block/partitions/core.c | 3 +++ 2 files changed, 4 insertions(+) diff --git a/block/blk.h b/block/blk.h index e85703ae81dd..05ac426350b2 100644 --- a/block/blk.h +++ b/block/blk.h @@ -414,6 +414,7 @@ void blk_free_ext_minor(unsigned int minor); #define ADDPART_FLAG_NONE 0 #define ADDPART_FLAG_RAID 1 #define ADDPART_FLAG_WHOLEDISK 2 +#define ADDPART_FLAG_READONLY 4 int bdev_add_partition(struct gendisk *disk, int partno, sector_t start, sector_t length); int bdev_del_partition(struct gendisk *disk, int partno); diff --git a/block/partitions/core.c b/block/partitions/core.c index b8112f52d388..355646b0707d 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -398,6 +398,9 @@ static struct block_device *add_partition(struct gendisk *disk, int partno, goto out_del; } + if (flags & ADDPART_FLAG_READONLY) + bdev->bd_read_only = true; + /* everything is up and running, commence */ err = xa_insert(&disk->part_tbl, partno, bdev, GFP_KERNEL); if (err)