From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-6.1 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham autolearn_force=no version=3.4.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id 47B7F7D089 for ; Mon, 12 Nov 2018 09:58:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729138AbeKLTtq (ORCPT ); Mon, 12 Nov 2018 14:49:46 -0500 Received: from mail-wm1-f68.google.com ([209.85.128.68]:33629 "EHLO mail-wm1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729133AbeKLTtq (ORCPT ); Mon, 12 Nov 2018 14:49:46 -0500 Received: by mail-wm1-f68.google.com with SMTP id f19-v6so8476571wmb.0 for ; Mon, 12 Nov 2018 01:57:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=P7bU520jYWPTb3cyPzcSyUy1YpHK+qexJMs0P6lqanE=; b=JtQQC93arLRCUkYIzxYNMaBRBMon6J3hW9n1Xxh71Mx0tPT2003ZczFsHzJ42mmoOX CFbUgZR3B0Jz5VRmHN1WePt8B0KRBQkeu6YZZjQxZMnpbSTRsYSnZaaMTfMQXbgZ9JGD le/9K33CGl4PFQx+RuuGtMEVzyJUE113m9ick= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=P7bU520jYWPTb3cyPzcSyUy1YpHK+qexJMs0P6lqanE=; b=i+Tv2MHggweVAqb1tV0dIiQvh51ztCkJXnPB2pRrnWEcHjV9mdA8AxM8En2e9TRswo nYq1gxw4mRGyz2M0/z1cjHWwmzT/oXZpTywoN8+AiKRG0Zi4y6SxvOGKGJPhMage9Y9Y L4hfubpBq3jrgoYToVIpv/XnM3qbUeKeVf8vU1FTccfQC42Mrmu4AKKmCmMSyLc043/v M/oJOMIoabPnS1v+kMhKt7zlhqv8w4fYbV3SF9GGb4+2Ek/p9sNeqZwg9ADZ5GlhuJtB XkIqz7dNIq/tcRhCqTYTquwG6HKu0cnE818nZkj+YWedKN7MSCjgEsLJCvXwbznPh3TR CDQQ== X-Gm-Message-State: AGRZ1gIl6VLBObNCAK0S5TVBOh7WuxNqziAWCxo+G011dJfQS5U7QuHA 18pXRxOnJ5gnUWpKsuVojh7W5O8ijGwvsQiZ X-Google-Smtp-Source: AJdET5fOPU/wEBvlrP6ob154UM+loSKSJ6hxBJmlftnunIrjo0kJIOyXnAZ6VBhayyAA8PJXPnmG9w== X-Received: by 2002:a1c:b5ce:: with SMTP id e197-v6mr6848082wmf.30.1542016635664; Mon, 12 Nov 2018 01:57:15 -0800 (PST) Received: from localhost.localdomain ([93.68.220.21]) by smtp.gmail.com with ESMTPSA id r14-v6sm21273089wro.8.2018.11.12.01.57.13 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 12 Nov 2018 01:57:15 -0800 (PST) From: Paolo Valente To: Jens Axboe , Greg Kroah-Hartman , Tejun Heo , Li Zefan , Angelo Ruocco , Dennis Zhou , Josef Bacik , Liu Bo , Bart Van Assche , Johannes Weiner Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, ulf.hansson@linaro.org, linus.walleij@linaro.org, broonie@kernel.org, bfq-iosched@googlegroups.com, oleksandr@natalenko.name, cgroups@vger.kernel.org, linux-doc@vger.kernel.org, Jonathan Corbet , Paolo Valente Subject: [PATCH 05/12] cgroup: add owner name to cftypes Date: Mon, 12 Nov 2018 10:56:25 +0100 Message-Id: <20181112095632.69114-6-paolo.valente@linaro.org> X-Mailer: git-send-email 2.16.1 In-Reply-To: <20181112095632.69114-1-paolo.valente@linaro.org> References: <20181112095632.69114-1-paolo.valente@linaro.org> Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org From: Angelo Ruocco The piece of information "who created a certain cftype" is not stored anywhere, thus a cftype is not able to know who is its owner. This commit addresses this problem by adding a new field in the cftype structure that enables the name of its owner to be explicitly set. Signed-off-by: Angelo Ruocco Signed-off-by: Paolo Valente --- include/linux/cgroup-defs.h | 2 ++ include/linux/cgroup.h | 13 +++++++++++++ 2 files changed, 15 insertions(+) diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h index d659763c7221..6e31f478c6e1 100644 --- a/include/linux/cgroup-defs.h +++ b/include/linux/cgroup-defs.h @@ -36,6 +36,7 @@ struct seq_file; #define MAX_CGROUP_TYPE_NAMELEN 32 #define MAX_CGROUP_ROOT_NAMELEN 64 #define MAX_CFTYPE_NAME 64 +#define MAX_OWNER_NAME 64 /* define the enumeration of all cgroup subsystems */ #define SUBSYS(_x) _x ## _cgrp_id, @@ -505,6 +506,7 @@ struct cftype { * end of cftype array. */ char name[MAX_CFTYPE_NAME]; + char owner_name[MAX_OWNER_NAME]; unsigned long private; /* diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 9968332cceed..bf17a9843f45 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -293,6 +293,19 @@ void css_task_iter_end(struct css_task_iter *it); ; \ else +/** + * list_for_each_cft - walk circular list of cftypes linked together + * @cft: cftype from where to start + * @n: cftype used as a temporary storage + * + * A cftype pointed by a file may be part of a circular list of cftypes, this + * macro walks the circular list starting from any given cftype. Unlike the + * "list_for_each_entry" macro, the first element is included in the iteration. + */ +#define list_for_each_cft(cft, n) \ + for (n = NULL; cft != n; n = (n == NULL) ? cft : n, \ + cft = list_next_entry(cft, share_node)) + /* * Inline functions. */ -- 2.16.1