From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 13F71C433E0 for ; Tue, 4 Aug 2020 09:34:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 08AF522B45 for ; Tue, 4 Aug 2020 09:34:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=szeredi.hu header.i=@szeredi.hu header.b="XO91VMIY" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727113AbgHDJe3 (ORCPT ); Tue, 4 Aug 2020 05:34:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40202 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725832AbgHDJe2 (ORCPT ); Tue, 4 Aug 2020 05:34:28 -0400 Received: from mail-ed1-x544.google.com (mail-ed1-x544.google.com [IPv6:2a00:1450:4864:20::544]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9CBA8C06174A for ; Tue, 4 Aug 2020 02:34:28 -0700 (PDT) Received: by mail-ed1-x544.google.com with SMTP id c2so23483019edx.8 for ; Tue, 04 Aug 2020 02:34:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=szeredi.hu; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Pv5BPk76i/MoWGs1gw+KWKrHA/vLK3W5JwzOEjOtqbI=; b=XO91VMIYWmJJyaLCqDwDI7R+/IhY8Otht/jNSco5h8lhYIS7roedId1R24+PWBV16J LGJrXnUSRgNnkCXYNmrxfDAd/fQa45PtQvzrfacRxUq3Htw7n9EcjRgyEZy0FGDPEzsx +Kf4QL8FkwyirK30cJnrDCj4Ay+ihET2LbOtc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Pv5BPk76i/MoWGs1gw+KWKrHA/vLK3W5JwzOEjOtqbI=; b=LUJQrz2C6tkEEPgoR6GvVBjdGs+WHrBXHLHQGkU6wXfY+LGD8w7vUpt2Id+PITzUDU PsFmoztGMqQH99+SEBe1KK7sD7TC5lRcPhmWDRp28UaPgssgrWwbLlEFs1dD0pcHbiYW mYUXKQPlmjcT5mV0G/U6LVY5v7LbDJWoraAg8sOd1qUa6you/S2M5jYimwNpnQUvSC1X 8ccajLV0ZpJGynz8hqyUWojVyxZOLIytEiI5yVSEMPvQMoAPG3pszzqWKLufG17vwvPC XnDLJR+dNNiS61IxfxplGh9WZuXgLlB/0vMdCOL8SIQo2kuHi8zW8jH4QPWuSL8urMfu hang== X-Gm-Message-State: AOAM530Ib8pgg0kkXGFkH53kb54pWpUUekas0uIQpWCi4ZZsYjWao6OM 6huJLY9p/p4ln+iXRCoXuYy2+afgIuBXFh9suw/K9Q== X-Google-Smtp-Source: ABdhPJyCVcW919I6oNh7+VZo4I3h9xZy6Vr4Yw7zYMnMeDWnx5DDKuBcJyX6d89ZTqqueg33E4gXqgxVmtE7jo4mugc= X-Received: by 2002:aa7:c915:: with SMTP id b21mr20325848edt.17.1596533666430; Tue, 04 Aug 2020 02:34:26 -0700 (PDT) MIME-Version: 1.0 References: <159646178122.1784947.11705396571718464082.stgit@warthog.procyon.org.uk> <159646179405.1784947.10794350637774567265.stgit@warthog.procyon.org.uk> In-Reply-To: <159646179405.1784947.10794350637774567265.stgit@warthog.procyon.org.uk> From: Miklos Szeredi Date: Tue, 4 Aug 2020 11:34:15 +0200 Message-ID: Subject: Re: [PATCH 01/18] fsinfo: Introduce a non-repeating system-unique superblock ID [ver #21] To: David Howells Cc: Al Viro , Linus Torvalds , Ian Kent , Miklos Szeredi , Christian Brauner , Jann Horn , "Darrick J. Wong" , Karel Zak , Jeff Layton , Linux API , linux-fsdevel@vger.kernel.org, LSM , linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 3, 2020 at 3:37 PM David Howells wrote: > > Introduce an (effectively) non-repeating system-unique superblock ID that > can be used to determine that two objects are in the same superblock > without needing to worry about the ID changing in the meantime (as is > possible with device IDs). > > The counter could also be used to tag other features, such as mount > objects. > > Signed-off-by: David Howells Reviewed-by: Miklos Szeredi