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=-2.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 62F76C4338F for ; Sat, 7 Aug 2021 14:47:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3D1AD60F9F for ; Sat, 7 Aug 2021 14:47:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229626AbhHGOsD (ORCPT ); Sat, 7 Aug 2021 10:48:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40344 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229578AbhHGOsC (ORCPT ); Sat, 7 Aug 2021 10:48:02 -0400 Received: from mail-pj1-x102d.google.com (mail-pj1-x102d.google.com [IPv6:2607:f8b0:4864:20::102d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 151B0C0613CF for ; Sat, 7 Aug 2021 07:47:45 -0700 (PDT) Received: by mail-pj1-x102d.google.com with SMTP id dw2-20020a17090b0942b0290177cb475142so27111622pjb.2 for ; Sat, 07 Aug 2021 07:47:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:subject:message-id:mime-version:content-disposition; bh=+vkH9j8tUoewZg1MK6qyB8b2x8/B2SkpcZ/QvWtdCow=; b=Dd2VK2j0kcSZiocWjc5lEAarkncxrg+GW8XduIIntmPGUZw1KB3d3lQbWyOiVzF1/k zscbvoXeRC09c1dhTckIOBIU403+Vbf5D0PJ4ZnEGrxRJ4MenfjZ4iqcTHz4HJIrg+/z nlgvxtK4kpMXHuXFBnaC/d2ziQ+demc3hNpfxoVRoG7EMrTU7EPfvATZMirwMR1Xq+GY 8TTEuAuS0XMM6pRQ3K12uuPsfpWPtEKz2N0ZCFJDDiziKITQzmRjGoPFyJx9wXvkQ+w9 CdR0nGDlOfvIAL1Syf6MaC4Rmq2xxJkDCHjcac2K/a5zax8Xdqo3iBEuvFcU9afTba0D PYow== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:subject:message-id:mime-version :content-disposition; bh=+vkH9j8tUoewZg1MK6qyB8b2x8/B2SkpcZ/QvWtdCow=; b=JeIe7q+TvZIm+3+aXKwASl70rbZAuU5BdwUHTLdgScdK4PWGqGejXpdGzW5eKPpVui V3IAoVxoQ17clm+nyjDklhuyqv4B0AB12fzN3ruFijfxN3vvN2Snl05ZWBYyNM94EWiG 33NWdj7H6NnSBk7RDRFdXIiigZemwiOa9G1gJnmG/uCB+TnVEjjI9ieYSOVkDYoEb5eo UJdIyGCkIKE7bx1KFfUTmoHku/NOaZcLOnsEeFzRnsrESH9Jz48pA+a05dpZ0diRcI8f Zf0cKttNPJM/ssH+IeTnFlwvGYGrjYz6JjogQIiO+bRoY+jNkx5rbC7Jlq9p7jPI8gbe njDQ== X-Gm-Message-State: AOAM533yipi+SkEsZJy3i7SdVFV35PIcf6pJkTHgylYuKbRR206MPboH 5ClnpIpVctH4r4C6oGKIYSS1skcpxzUpfw== X-Google-Smtp-Source: ABdhPJwV3EbJ7XkvEEvKzK8FcMOkp3zvdMOtNzgmfP7HSAcZRsXNnF4t1hvu0/dtOOfPlqERo0Klcg== X-Received: by 2002:a17:902:c205:b029:12c:daac:c8a0 with SMTP id 5-20020a170902c205b029012cdaacc8a0mr13021831pll.13.1628347664330; Sat, 07 Aug 2021 07:47:44 -0700 (PDT) Received: from realwakka ([59.12.165.26]) by smtp.gmail.com with ESMTPSA id c15sm11814625pjr.22.2021.08.07.07.47.43 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 07 Aug 2021 07:47:44 -0700 (PDT) Date: Sat, 7 Aug 2021 14:47:36 +0000 From: Sidong Yang To: linux-btrfs@vger.kernel.org Subject: Simple question for newbie developer about qgroup Message-ID: <20210807144736.GA2820@realwakka> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org I read btrfs kernel source code about qgroup. I want to know about how works adding or deleting qgroups. and I read the function __del_qgroup_relation() in qgroup.c. This function checks whether dst is parent for src and store the result in variable named found. I think if the checks failed, the function needs to be failed or print warning message at least. Am I right? Or do you have other intentions?