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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 DA0B2C11D26 for ; Thu, 20 Feb 2020 20:48:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BC6D824650 for ; Thu, 20 Feb 2020 20:48:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729128AbgBTUsa (ORCPT ); Thu, 20 Feb 2020 15:48:30 -0500 Received: from out01.mta.xmission.com ([166.70.13.231]:59842 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728969AbgBTUsa (ORCPT ); Thu, 20 Feb 2020 15:48:30 -0500 Received: from in02.mta.xmission.com ([166.70.13.52]) by out01.mta.xmission.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1j4skE-0001ri-62; Thu, 20 Feb 2020 13:48:26 -0700 Received: from ip68-227-160-95.om.om.cox.net ([68.227.160.95] helo=x220.xmission.com) by in02.mta.xmission.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.87) (envelope-from ) id 1j4skD-00085Y-Cz; Thu, 20 Feb 2020 13:48:26 -0700 From: ebiederm@xmission.com (Eric W. Biederman) To: Linus Torvalds Cc: Al Viro , LKML , Kernel Hardening , Linux API , Linux FS Devel , Linux Security Module , Akinobu Mita , Alexey Dobriyan , Andrew Morton , Andy Lutomirski , Daniel Micay , Djalal Harouni , "Dmitry V . Levin" , Greg Kroah-Hartman , Ingo Molnar , "J . Bruce Fields" , Jeff Layton , Jonathan Corbet , Kees Cook , Oleg Nesterov , Solar Designer References: <20200210150519.538333-8-gladkov.alexey@gmail.com> <87v9odlxbr.fsf@x220.int.ebiederm.org> <20200212144921.sykucj4mekcziicz@comp-core-i7-2640m-0182e6> <87tv3vkg1a.fsf@x220.int.ebiederm.org> <87v9obipk9.fsf@x220.int.ebiederm.org> <20200212200335.GO23230@ZenIV.linux.org.uk> <20200212203833.GQ23230@ZenIV.linux.org.uk> <20200212204124.GR23230@ZenIV.linux.org.uk> <87lfp7h422.fsf@x220.int.ebiederm.org> <87pnejf6fz.fsf@x220.int.ebiederm.org> Date: Thu, 20 Feb 2020 14:46:25 -0600 In-Reply-To: <87pnejf6fz.fsf@x220.int.ebiederm.org> (Eric W. Biederman's message of "Wed, 12 Feb 2020 22:37:52 -0600") Message-ID: <871rqpaswu.fsf_-_@x220.int.ebiederm.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-XM-SPF: eid=1j4skD-00085Y-Cz;;;mid=<871rqpaswu.fsf_-_@x220.int.ebiederm.org>;;;hst=in02.mta.xmission.com;;;ip=68.227.160.95;;;frm=ebiederm@xmission.com;;;spf=neutral X-XM-AID: U2FsdGVkX1/Q6NKhmM+yXD+yJ+hS7KlJi2ul8+5zveY= X-SA-Exim-Connect-IP: 68.227.160.95 X-SA-Exim-Mail-From: ebiederm@xmission.com Subject: [PATCH 0/7] proc: Dentry flushing without proc_mnt X-SA-Exim-Version: 4.2.1 (built Thu, 05 May 2016 13:38:54 -0600) X-SA-Exim-Scanned: Yes (on in02.mta.xmission.com) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Just because it is less of a fundamental change and less testing I went and looked at updating proc_flush_task to use a list as Al suggested. If we can stand an sget/deactivate_super pair for every dentry we want to invalidate I think I have something. Comments from anyone will be appreciated I gave this some light testing and the code is based on something similar already present in proc so I think there is a high chance this code is correct but I could easily be wrong. Linus, does this approach look like something you can stand? Eric Eric W. Biederman (7): proc: Rename in proc_inode rename sysctl_inodes sibling_inodes proc: Generalize proc_sys_prune_dcache into proc_prune_siblings_dcache proc: Mov rcu_read_(lock|unlock) in proc_prune_siblings_dcache proc: Use d_invalidate in proc_prune_siblings_dcache proc: Clear the pieces of proc_inode that proc_evict_inode cares about proc: Use a list of inodes to flush from proc proc: Ensure we see the exit of each process tid exactly once fs/exec.c | 5 +-- fs/proc/base.c | 111 ++++++++++++++++-------------------------------- fs/proc/inode.c | 60 +++++++++++++++++++++++--- fs/proc/internal.h | 4 +- fs/proc/proc_sysctl.c | 45 +++----------------- include/linux/pid.h | 2 + include/linux/proc_fs.h | 4 +- kernel/exit.c | 4 +- kernel/pid.c | 16 +++++++ 9 files changed, 124 insertions(+), 127 deletions(-)