From patchwork Tue Jun 8 04:35:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Muneendra Kumar X-Patchwork-Id: 456282 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=-17.4 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=unavailable 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 63B54C4743D for ; Tue, 8 Jun 2021 11:36:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4FA5861354 for ; Tue, 8 Jun 2021 11:36:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232054AbhFHLiX (ORCPT ); Tue, 8 Jun 2021 07:38:23 -0400 Received: from saphodev.broadcom.com ([192.19.11.229]:43140 "EHLO relay.smtp-ext.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231630AbhFHLiV (ORCPT ); Tue, 8 Jun 2021 07:38:21 -0400 X-Greylist: delayed 505 seconds by postgrey-1.27 at vger.kernel.org; Tue, 08 Jun 2021 07:38:21 EDT Received: from localhost.localdomain (unknown [10.157.2.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by relay.smtp-ext.broadcom.com (Postfix) with ESMTPS id 9526438915; Tue, 8 Jun 2021 04:28:02 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 relay.smtp-ext.broadcom.com 9526438915 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=broadcom.com; s=dkimrelay; t=1623151685; bh=j1fDoqrbxwOe5zBuiEB/epddfHn3Zlqr0QVRwmcwGk8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iXWiTSwjVpqM31rTka0FtmucGSxxEZWwbnl33m2MOdTFdZEAMAnHNbhOVV/CKX+6o IF+I0wMmLlXIggCHBZzcyC30gE8iS0+EuJDbLgYvBli9a/W0ugaQCHB/NKdccjiN5n /GjEC8ufERXITvi9tZwmCj0kqZuH1bueZ5vaLF5I= From: Muneendra Kumar 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, Muneendra , Himanshu Madhani Subject: [PATCH v11 01/13] cgroup: Added cgroup_get_from_id Date: Tue, 8 Jun 2021 10:05:44 +0530 Message-Id: <20210608043556.274139-2-muneendra.kumar@broadcom.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210608043556.274139-1-muneendra.kumar@broadcom.com> References: <20210608043556.274139-1-muneendra.kumar@broadcom.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Muneendra 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 Acked-by: Tejun Heo Reviewed-by: Himanshu Madhani Reviewed-by: Hannes Reinecke Signed-off-by: Muneendra --- v11: No change v10: No change v9: Addressed the issues reported by kernel test robot v8: No change v7: No change v6: No change 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 4f2f79de083e..d2eace88d9d1 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 inline 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 e049edd66776..bd3251d4fcc7 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -577,6 +577,7 @@ 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) { @@ -5776,6 +5777,31 @@ 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