From patchwork Mon Nov 12 09:56:25 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Valente X-Patchwork-Id: 10678413 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C523D13AD for ; Mon, 12 Nov 2018 09:58:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B42E829F62 for ; Mon, 12 Nov 2018 09:58:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A824029F64; Mon, 12 Nov 2018 09:58:16 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4F66729F62 for ; Mon, 12 Nov 2018 09:58:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729157AbeKLTtq (ORCPT ); Mon, 12 Nov 2018 14:49:46 -0500 Received: from mail-wm1-f66.google.com ([209.85.128.66]:33628 "EHLO mail-wm1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727185AbeKLTtp (ORCPT ); Mon, 12 Nov 2018 14:49:45 -0500 Received: by mail-wm1-f66.google.com with SMTP id f19-v6so8476574wmb.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=pVD5k/+p1F1YxbE2S53YeRxpF8q8o6moAHYsl0jktpQPSVFqGdnTyk8aG/mPbXZdmt c4/ap1o5g+qlAO3eVbDD8giRTrD9WpJtaDm+kIy62LNFf0kCqZXq0IGHB89LgyoeXsIU rdUgqLlrkdu1keUhatZYDIb/8bynnJTP+zRtRrl3bicCsKtJL7/K8vVIzlVRX2R8Rrsc LhTIZ1/KVV5425xrLg3FcvtAh2p6uv+kXPzzQo5Cd7RsjXDrR61TBcpmAWFioniyWS6X /YFnzIf9AsbQfTkpparHPfEm1QzgEA8H+8+lWkQpPJ+pj0f02a70uKiJhMiKFq7uhHQK 3C9g== X-Gm-Message-State: AGRZ1gLfHBvOInP34pmIi1N1fRlALfGNKTZxkOOzxjmWxAtbcUsTbRjq k8N+AqNZmrL55ZaDPjlkKaZvRg== 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-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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. */