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 A53722DFF19; Thu, 4 Sep 2025 22:06:52 +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=1757023615; cv=none; b=YvTZkxd6/Iyc7VMNHmFCYi3Vokd7c4tmH2A0rh7mZ5x/64BrnjiVyyva6JP4F5u593Qb6XZUWETRxn5GRyiRLszFZbvBzZXz5s+O7Fs6HYE59vmyUlz/v7X97K9eLOz5aScByJzImSykyuaYhCLB2pPUjPhZeFDiBicG31/B9WI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757023615; c=relaxed/simple; bh=goG337sZ/iRHs3pRg9IZxmLubB1x5C9U5Sw7O7bN8x4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=oXJnbzThExEQ9Iqz3knIMJSp7rG0WtgZ8ELKUTtWZhTJ/lOpPwVIVFwV0bAF95T3LT9Z69Z6MAUYFOkq34MmUXif2YtEnMqC01bBt9UjenosATu/n6C7MHKBCVoZIQ4uzdIP3MfCaECsm1dbelVn2jqfblW81GT3Jh5sxOAAv2o= 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=IA/GY3OG; 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="IA/GY3OG" 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=sUoP8dczSKqO6gmkDe5U7V6bW3hFctcl6QkG72jE5VE=; b=IA/GY3OGXbne4WiPiqvcWh0/sI BT5ootVDmUd+BOddTVFnEZMmdKkW2F64/+0ngNoLDXs7r5GLn4kI/pfVDyiUxLQd9fRTJwsIFrHmC 9kGxOfpl3JS2FNaV3SGzygGx9F1rSCelnyAItDUJIbaIFbIt1i4v4rd7ll5XlNCzvG08fZ/qbZzu3 tciJjkDe9HwU0dJ+Od4MWT1seLZsBN/3txptlomAGl7W8D6T9dxwPgcNbSIyghKlKzgvR0U/qAmB3 H8YmcU3Dvtw3G6POd40lTIvq4Ro1x1JokwqfuAnuCrOf1/pSvawfaICir81SnmmVA0kQyXVIf2ZgB 1bbHjdrw==; Received: from viro by zeniv.linux.org.uk with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1uuI6U-00000008x1R-0Yb4; Thu, 04 Sep 2025 22:06:50 +0000 Date: Thu, 4 Sep 2025 23:06:50 +0100 From: Al Viro To: Blake McBride Cc: "linux-fsdevel@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "brauner@kernel.org" , "akpm@linux-foundation.org" , Colby Wes McBride Subject: Re: [RFC] View-Based File System Model with Program-Scoped Isolation Message-ID: <20250904220650.GQ39973@ZenIV> References: 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: Sender: Al Viro On Thu, Sep 04, 2025 at 09:52:22PM +0000, Blake McBride wrote: > Proposed Model > -------------- > The key concept is the introduction of *views*. A view is a named, > use-case-specific file hierarchy that contains a subset of the overall > files on the system. Each view presents its own hierarchy, which can > be completely different from others. Files may appear in multiple > views, and may even have different names per view. What happens on cross-directory rename? Within the same "view", that is. How does it map to changes observable in other views of yours?