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=-17.2 required=3.0 tests=BAYES_00,DATE_IN_PAST_06_12, DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 B11ECC0018C for ; Wed, 16 Dec 2020 12:23:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4E5D4230FA for ; Wed, 16 Dec 2020 12:23:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725891AbgLPMXb (ORCPT ); Wed, 16 Dec 2020 07:23:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48882 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725385AbgLPMXb (ORCPT ); Wed, 16 Dec 2020 07:23:31 -0500 Received: from mail-pg1-x533.google.com (mail-pg1-x533.google.com [IPv6:2607:f8b0:4864:20::533]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 22562C0617A6 for ; Wed, 16 Dec 2020 04:22:51 -0800 (PST) Received: by mail-pg1-x533.google.com with SMTP id c22so2099507pgg.13 for ; Wed, 16 Dec 2020 04:22:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:from:to:cc:subject:date:message-id:in-reply-to :references; bh=XydzqVCIfvQOdz6sh1D78ve4Odu9PhRS+RbZjruU+y0=; b=Ljx5/y1WmwqufwBGtalwHHnyjg8OiaXIcPpXFOvStWFEe+KqfVZ3YOO6IOhjvuqeqJ T6qVbeF2sFWpqtvT/C7VIJJze0Ly+MO4qRDdqdAukMUH/Y95nFIJ1Ft8u3Imu3uijQZx IgKcIBT4cPfr4z0c98TGZpzQgogADq7aSmwa4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :in-reply-to:references; bh=XydzqVCIfvQOdz6sh1D78ve4Odu9PhRS+RbZjruU+y0=; b=FSrlIDpyKUiz3USJj+IjTKbmSb/jjvcr0p6uS1GMx60thChOHZEaO+Ulp5EmEmjV0F Q+bMvXxUmb5jLN0Cnx+v/IhJTP5Q78UlHWenHf0ncwB2TEWUFcUeo8xIy9qd5jVir5/Z LF2zaHGVLuXrotiPKe5V3ZII97X+JEcOWIoaRnpNyIPf/UaUe/mFbF6OhX1E/jYDf9NO 3lQaP/GyTbpE6hHeQQrJvUSA/k0I86gYm73ojRIXQB6+mQTwKq+4HOW92xMRp3kODGd/ R9vYH1cdnqLafxTTBp2dJizDXRpYSo8kD5YeMX8Z4mdbvuqq1VePVsWcuWX9jvo6Q4Dq LIcw== MIME-Version: 1.0 X-Gm-Message-State: AOAM531Y1yE8bYuqfTe6s5Y2NeluRtHftWdMXo+fS0ryr4mmJb5qZcuL uBdjxOzr7nfZMXkrHzdz43zkXIopylJVQy4au1Y3eARCILCc87HE06c54w65+kK7+m/hxbbucMe 7ZAkpP3PfwcoeE9wfU2DoLKk= X-Google-Smtp-Source: ABdhPJwbLrQTS3ScEIvote8nd17uCJZURZtOX20Ej/Cj2v79zmUPlKpWHBQJ+FmN/lBghLWX8vKybA== X-Received: by 2002:a63:da4f:: with SMTP id l15mr6405369pgj.22.1608121370565; Wed, 16 Dec 2020 04:22:50 -0800 (PST) Received: from localhost.localdomain ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id s7sm2477296pfh.207.2020.12.16.04.22.47 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 16 Dec 2020 04:22:49 -0800 (PST) From: Muneendra To: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, tj@kernel.org, linux-nvme@lists.infradead.org, hare@suse.de Cc: jsmart2021@gmail.com, emilne@redhat.com, mkumar@redhat.com, pbonzini@redhat.com, Muneendra Subject: [PATCH v5 01/16] cgroup: Added cgroup_get_from_id Date: Wed, 16 Dec 2020 10:59:31 +0530 Message-Id: <1608096586-21656-2-git-send-email-muneendra.kumar@broadcom.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1608096586-21656-1-git-send-email-muneendra.kumar@broadcom.com> References: <1608096586-21656-1-git-send-email-muneendra.kumar@broadcom.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000011ef7505b693ef17" Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org --00000000000011ef7505b693ef17 Content-Type: text/plain; charset="US-ASCII" Added a new function cgroup_get_from_id to retrieve the cgroup associated with cgroup id. Exported the same as this can be used by blk-cgorup.c Added function declaration of cgroup_get_from_id in cgorup.h This patch also exported the function cgroup_get_e_css as this is getting used in blk-cgroup.h Signed-off-by: Muneendra --- v5: renamed the function cgroup_get_from_kernfs_id to cgroup_get_from_id v4: No change v3: Exported the cgroup_get_e_css v2: New patch --- include/linux/cgroup.h | 6 ++++++ kernel/cgroup/cgroup.c | 26 ++++++++++++++++++++++++++ 2 files changed, 32 insertions(+) diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 618838c48313..da31b14db198 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -696,6 +696,7 @@ static inline void cgroup_kthread_ready(void) } void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen); +struct cgroup *cgroup_get_from_id(u64 id); #else /* !CONFIG_CGROUPS */ struct cgroup_subsys_state; @@ -743,6 +744,11 @@ static inline bool task_under_cgroup_hierarchy(struct task_struct *task, static inline void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen) {} + +static struct cgroup *cgroup_get_from_id(u64 id) +{ + return NULL; +} #endif /* !CONFIG_CGROUPS */ #ifdef CONFIG_CGROUPS diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index e41c21819ba0..34ebfbeba098 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -580,6 +580,7 @@ struct cgroup_subsys_state *cgroup_get_e_css(struct cgroup *cgrp, rcu_read_unlock(); return css; } +EXPORT_SYMBOL_GPL(cgroup_get_e_css); static void cgroup_get_live(struct cgroup *cgrp) { @@ -5805,6 +5806,31 @@ void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen) kernfs_put(kn); } +/* + * cgroup_get_from_id : get the cgroup associated with cgroup id + * @id: cgroup id + * On success it returns the cgrp on failure it returns NULL + */ +struct cgroup *cgroup_get_from_id(u64 id) +{ + struct kernfs_node *kn; + struct cgroup *cgrp = NULL; + + mutex_lock(&cgroup_mutex); + kn = kernfs_find_and_get_node_by_id(cgrp_dfl_root.kf_root, id); + if (!kn) + goto out_unlock; + + cgrp = kn->priv; + if (cgroup_is_dead(cgrp) || !cgroup_tryget(cgrp)) + cgrp = NULL; + kernfs_put(kn); +out_unlock: + mutex_unlock(&cgroup_mutex); + return cgrp; +} +EXPORT_SYMBOL_GPL(cgroup_get_from_id); + /* * proc_cgroup_show() * - Print task's cgroup paths into seq_file, one line for each hierarchy -- 2.26.2 -- This electronic communication and the information and any files transmitted with it, or attached to it, are confidential and are intended solely for the use of the individual or entity to whom it is addressed and may contain information that is confidential, legally privileged, protected by privacy laws, or otherwise restricted from disclosure to anyone else. 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