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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 3D6BBC4320A for ; Fri, 30 Jul 2021 07:59:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 11B3E60C51 for ; Fri, 30 Jul 2021 07:59:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237965AbhG3H75 (ORCPT ); Fri, 30 Jul 2021 03:59:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55728 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237886AbhG3H75 (ORCPT ); Fri, 30 Jul 2021 03:59:57 -0400 Received: from mail-vs1-xe2b.google.com (mail-vs1-xe2b.google.com [IPv6:2607:f8b0:4864:20::e2b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B885C0613C1 for ; Fri, 30 Jul 2021 00:59:53 -0700 (PDT) Received: by mail-vs1-xe2b.google.com with SMTP id p13so4983089vsg.2 for ; Fri, 30 Jul 2021 00:59:53 -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=gK4U84S6B9L4iN73gKuaKX/AcZOyGaMtF/xYKwHgDIU=; b=C/ey1SeItuAZAwl7VAHZWwQkJwbhGY4q37umjmbR+XDSekjz3itQg844Fk2dxrC26j aRGtxOHIhfjGtHB3vNzFTNZT0XLiRe1N1lOpoEtbpMqXDnW9FNBS+eEWcONAQJIXgxVG NLZZmKR0icajN1l9q+ZbPcQKutA4QaiOiving= 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=gK4U84S6B9L4iN73gKuaKX/AcZOyGaMtF/xYKwHgDIU=; b=jyIAJQ9vHID/MxcHTF5rePoA+TGO845WQvGXTg7pd60MTlTVyvVx5Iow+hoEG2t18W DdjaMfkCpOhrdqofl/eXM/blAXv9AX3k6lafe805DNBjezI45Nxn+9tC76KzYYYvTx5U JVQwUbySgszlUbBXsp02o5AbNrzETfAHmTxgfD1n8TKYN2EmalxgeUIrF6JPfEzL8twY bS7yVDi5XgeDS/lW0EPQEob0ydz4B7HKS/b6C1oKg2DG1In6PA23VFIx5K86qW24KHWF 08yNXsncsJkDHhKpGjLxTTJqInKYb50zcSL/lN3vI1zsJPgmI4zUtQ7zq97O4Z1YDM4N VAOA== X-Gm-Message-State: AOAM532JIcYLNtCPjTzwI9liYt03v+rczVu3cBIRwwbeotqy8gFvofaP i2GxlOIOSlTvN72Cn02FIV8cxVRyc57jIQCbiXzI9w== X-Google-Smtp-Source: ABdhPJzNAQNQqqV/aJfK7JQPWmq2dMTFXC58sCKEj31HVNqDBqtViSN2IlYnT49qjaazqVwklWIuTuBPVPd5xfuBGoU= X-Received: by 2002:a05:6102:34d9:: with SMTP id a25mr594234vst.0.1627631992199; Fri, 30 Jul 2021 00:59:52 -0700 (PDT) MIME-Version: 1.0 References: <162742539595.32498.13687924366155737575.stgit@noble.brown> <162742546548.32498.10889023150565429936.stgit@noble.brown> <162762290067.21659.4783063641244045179@noble.neil.brown.name> <162762562934.21659.18227858730706293633@noble.neil.brown.name> <162763043341.21659.15645923585962859662@noble.neil.brown.name> In-Reply-To: <162763043341.21659.15645923585962859662@noble.neil.brown.name> From: Miklos Szeredi Date: Fri, 30 Jul 2021 09:59:41 +0200 Message-ID: Subject: Re: [PATCH 01/11] VFS: show correct dev num in mountinfo To: NeilBrown Cc: Al Viro , Christoph Hellwig , Josef Bacik , "J. Bruce Fields" , Chuck Lever , Chris Mason , David Sterba , linux-fsdevel@vger.kernel.org, Linux NFS list , Btrfs BTRFS Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On Fri, 30 Jul 2021 at 09:34, NeilBrown wrote: > But I'm curious about your reference to "some sort of subvolume > structure that the VFS knows about". Do you have any references, or can > you suggest a search term I could try? Found this: https://lore.kernel.org/linux-fsdevel/20180508180436.716-1-mfasheh@suse.de/ I also remember discussing it at some LSF/MM with the btrfs devs, but no specific conclusion. Thanks, Miklos