From patchwork Tue May 23 07:45:21 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 685258 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 B901FC7EE32 for ; Tue, 23 May 2023 07:46:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235624AbjEWHqU (ORCPT ); Tue, 23 May 2023 03:46:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41758 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235557AbjEWHqM (ORCPT ); Tue, 23 May 2023 03:46:12 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 51DF8119; Tue, 23 May 2023 00:46:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=os0MBKKbxqig3Onswrq7Zcvd+L0EYsCNlnX80lA2o9g=; b=fekrZqAoQ4hechvxjoK8F7dWKk 5f5fS0BS6/TMGtsVCSThfqxK4EyqTmCpcQUuksucwHHaz8mxgLl+oQlV0P2A6iBioeLOEgHoXJcCl 40lgBbs5Wly6X56KLIB0nV+/r0wKF9pLUxHF5UBSwB+icaY6QiZ3mSna4clKWX+cej2SwcJ5byDB2 xdZVTUACgJTL47xvgS86JV4hUtfW0g3/+/R7fmZ2oVWAbKgVHl2PhyljuOtB21GAX9q1B8P2+TYr5 r6VwB/dmng2zncC+qn0WDnKxoAWQ8EGds/p37+gEHXr6KF89G8ID7pin3hPrwoQTZQi9IAl0CgUkT zUqxZbgQ==; Received: from [2001:4bb8:188:23b2:6ade:85c9:530f:6eb0] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1q1Mib-009Gjq-0W; Tue, 23 May 2023 07:46:05 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Greg Kroah-Hartman , "Rafael J. Wysocki" , Mike Snitzer , Joern Engel , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Pavel Machek , dm-devel@redhat.com, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-mtd@lists.infradead.org, linux-pm@vger.kernel.org Subject: [PATCH 10/24] init: handle ubi/mtd root mounting like all other root types Date: Tue, 23 May 2023 09:45:21 +0200 Message-Id: <20230523074535.249802-11-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230523074535.249802-1-hch@lst.de> References: <20230523074535.249802-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Assign a Root_Generic magic value for UBI/MTD root and handle the root mounting in mount_root like all other root types. Besides making the code more clear this also means that UBI/MTD root can be used together with an initrd (not that anyone should care). Also factor parsing of the root name into a helper now that it can be easily done and will get more complicated with subsequent patches. Signed-off-by: Christoph Hellwig --- include/linux/root_dev.h | 1 + init/do_mounts.c | 23 ++++++++++++++--------- 2 files changed, 15 insertions(+), 9 deletions(-) diff --git a/include/linux/root_dev.h b/include/linux/root_dev.h index ed3ea8da642972..847c9a06101b76 100644 --- a/include/linux/root_dev.h +++ b/include/linux/root_dev.h @@ -9,6 +9,7 @@ enum { Root_NFS = MKDEV(UNNAMED_MAJOR, 255), Root_CIFS = MKDEV(UNNAMED_MAJOR, 254), + Root_Generic = MKDEV(UNNAMED_MAJOR, 253), Root_RAM0 = MKDEV(RAMDISK_MAJOR, 0), }; diff --git a/init/do_mounts.c b/init/do_mounts.c index 74cc96bffbdd71..be6d14733ba02f 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -591,6 +591,10 @@ void __init mount_root(char *root_device_name) case Root_CIFS: mount_cifs_root(); break; + case Root_Generic: + mount_root_generic(root_device_name, root_device_name, + root_mountflags); + break; case 0: if (root_device_name && root_fs_names && mount_nodev_root(root_device_name) == 0) @@ -602,6 +606,14 @@ void __init mount_root(char *root_device_name) } } +static dev_t __init parse_root_device(char *root_device_name) +{ + if (!strncmp(root_device_name, "mtd", 3) || + !strncmp(root_device_name, "ubi", 3)) + return Root_Generic; + return name_to_dev_t(root_device_name); +} + /* * Prepare the namespace - decide what/where to mount, load ramdisks, etc. */ @@ -624,15 +636,8 @@ void __init prepare_namespace(void) md_run_setup(); - if (saved_root_name[0]) { - if (!strncmp(saved_root_name, "mtd", 3) || - !strncmp(saved_root_name, "ubi", 3)) { - mount_root_generic(saved_root_name, saved_root_name, - root_mountflags); - goto out; - } - ROOT_DEV = name_to_dev_t(saved_root_name); - } + if (saved_root_name[0]) + ROOT_DEV = parse_root_device(saved_root_name); if (initrd_load(saved_root_name)) goto out;