From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from zeniv.linux.org.uk (zeniv.linux.org.uk [62.89.141.173]) (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 899282C324E for ; Sun, 4 Jan 2026 07:26:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.89.141.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767511598; cv=none; b=icqfJOwe41xWLhL9e3gUQyjHVJhlz+1yfFZz9KEpbA0SXILcJeavU+yuAcE1heb7v2aUtaljXlViNmDrnpjRXJk8PCwVub5URrQ+NBLvjW39eAptWab6iHpsp77bFHmTasf+TV4yuycVfxlFyVI9RVXo2efrycbgqNhLqjM5YLU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767511598; c=relaxed/simple; bh=797pTPzFk1t2Gv04Y+BzHfCUzEyt4TMA29+yJRF1E9s=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Hg4+E1Ux0w2jsGMwSjD4+G7Ja9B61UC+7fb3Voa4xNWLl0135Kg11mTl4QeJQOx+hIfEVNsYFrw0Ddq7Hbl8LSYdJb51jqWBca9jDI9cvq5xrxrqRz9rd8kGVudrXdWOrvebaef4HM56zNzldelfsRZb++c6Rz1u+Hgo02fSGx0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk; spf=none smtp.mailfrom=ftp.linux.org.uk; dkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk header.b=XjoiHcCj; arc=none smtp.client-ip=62.89.141.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=ftp.linux.org.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk header.b="XjoiHcCj" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=linux.org.uk; s=zeniv-20220401; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=1WGKsRjnjJIxmU15OdEy7I0waZHIklv2O6BiIKzoX6k=; b=XjoiHcCjgSJKh+ztywqf5Pwvoq usdXTJffppBWHCpGWhciCP50Ub+ITUrzGmPfnskhkk99vdx0yXurKRgGO43Tqo1XaMEdM12kbwCKL QYNEva+75FbS2RY+IfzWSPjViR9U4b72+wv4oRHlTohxITV/Eedg3AYfhvIGhPHBxyIctcDWNwxOm SEhT6rGCb1FnYrOTi5i9uDREB0H710XP+TCzkMmz8rzHqsh3PZtymmXfEVqtdgd1gl3MUmIN3pa/N diumzJUk8qX+7ixhOxYPpyuYErHon1oFUDHDexrdx1/2LhC1PZQLlskRKLAoOa17qrTOZ6dLni6sC K7xT9JSQ==; Received: from viro by zeniv.linux.org.uk with local (Exim 4.99 #2 (Red Hat Linux)) id 1vcIWd-0000000Cw8W-10SF; Sun, 04 Jan 2026 07:27:43 +0000 Date: Sun, 4 Jan 2026 07:27:43 +0000 From: Al Viro To: Christian Brauner Cc: linux-fsdevel@vger.kernel.org, Jan Kara , Jeff Layton , Amir Goldstein , Lennart Poettering , Zbigniew =?utf-8?Q?J=C4=99drzejewski-Szmek?= , Josef Bacik Subject: Re: [PATCH 3/3] fs: add immutable rootfs Message-ID: <20260104072743.GI1712166@ZenIV> References: <20260102-work-immutable-rootfs-v1-0-f2073b2d1602@kernel.org> <20260102-work-immutable-rootfs-v1-3-f2073b2d1602@kernel.org> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260102-work-immutable-rootfs-v1-3-f2073b2d1602@kernel.org> Sender: Al Viro On Fri, Jan 02, 2026 at 03:36:24PM +0100, Christian Brauner wrote: > +// SPDX-License-Identifier: GPL-2.0-only > +/* Copyright (c) 2026 Christian Brauner */ > +#include > +#include > +#include [snip] What does it give you compared to an empty ramfs? Or tmpfs, for that matter... Why bother with a separate fs type?