From patchwork Mon Nov 19 10:34:18 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Valente X-Patchwork-Id: 10688451 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 5255213B5 for ; Mon, 19 Nov 2018 10:34:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 40BC7287F8 for ; Mon, 19 Nov 2018 10:34:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3413A2964C; Mon, 19 Nov 2018 10:34:51 +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 036DF287F8 for ; Mon, 19 Nov 2018 10:34:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727760AbeKSU6A (ORCPT ); Mon, 19 Nov 2018 15:58:00 -0500 Received: from mail-wm1-f65.google.com ([209.85.128.65]:33376 "EHLO mail-wm1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728128AbeKSU6A (ORCPT ); Mon, 19 Nov 2018 15:58:00 -0500 Received: by mail-wm1-f65.google.com with SMTP id 79so2404334wmo.0 for ; Mon, 19 Nov 2018 02:34:47 -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=ixCco3tkgOz6XOnATIyg3v7JG+fMVyFH/i6hN9+7LbE=; b=kKp2I6yh/orVyEouSJpVWokRdAT9xO+g+kCnqgaaTzcRgXwvj2mzpvsQeI/fL870j/ FWJpkmfYHVEX994JHS9HKt3nipa3xeLHvXCMO6b7u5kQXIhAGjuRJ+Y8HyG2lb5f+Ag9 5/O6i7rXVsv45I3wffJr69woHSqCdtIyD3Cxw= 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=ixCco3tkgOz6XOnATIyg3v7JG+fMVyFH/i6hN9+7LbE=; b=YItD4pChOaXNVIAEvlQEvq3QnR825QYG8rvxepPtD1RG/Y9tI/HLWhbTqSfL5iaBq/ HsUo6AwxnVMLuWqfqOwhMeaSDDlIMM/Ahuqx77XkH724xxzkG5kC0BRpnEUoWtQ94HdE X3n/UUTrX+8b93tbpngnChPVl0qn4k3OR1r3J7mVNxOmSorepiy4mLVAbEa4RKQDJoOD kklLexFF7AyWfXTvQo5yj1Y0r6MFDe4eYsdnE5g9rZsLi0ODqEr353jiX7sotClwPNlY ZT5CTm6WkRlYyyOTEujn1N4zXSZvHfjUZNuJpUQHfcGFqOC68ykMoCDleZaUJhLxGXo0 /IHg== X-Gm-Message-State: AA+aEWZ/ybcLu4+OvfZi6fEXzBf6qiAlswYTL3DOnCyg2KYclO27V0ob oeMDJ6I65rTo0z6jjQkFBxKuCg== X-Google-Smtp-Source: AFSGD/XQN0bxurfeBwqVhi42PyrkCx7YpUAfDxlfoSPjxaAmOF+536pj4Jx/EI2aSgzxGuXsLZUQ4w== X-Received: by 2002:a1c:2b45:: with SMTP id r66-v6mr6662149wmr.128.1542623686156; Mon, 19 Nov 2018 02:34:46 -0800 (PST) Received: from localhost.localdomain ([37.162.18.180]) by smtp.gmail.com with ESMTPSA id e9sm14973298wro.16.2018.11.19.02.34.43 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 19 Nov 2018 02:34:45 -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 V2 04/10] cgroup: add owner name to cftypes Date: Mon, 19 Nov 2018 11:34:18 +0100 Message-Id: <20181119103424.3853-5-paolo.valente@linaro.org> X-Mailer: git-send-email 2.16.1 In-Reply-To: <20181119103424.3853-1-paolo.valente@linaro.org> References: <20181119103424.3853-1-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 9d12757a65b0..267153bd898a 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -291,6 +291,19 @@ 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. */