From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753001Ab0ITHUK (ORCPT ); Mon, 20 Sep 2010 03:20:10 -0400 Received: from out02.mta.xmission.com ([166.70.13.232]:51104 "EHLO out02.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752317Ab0ITHUJ (ORCPT ); Mon, 20 Sep 2010 03:20:09 -0400 From: ebiederm@xmission.com (Eric W. Biederman) To: "Hans J. Koch" Cc: Greg Kroah-Hartman , linux-kernel@vger.kernel.org, Thomas Gleixner References: <20100917205946.GF2522@local> Date: Mon, 20 Sep 2010 00:19:59 -0700 In-Reply-To: <20100917205946.GF2522@local> (Hans J. Koch's message of "Fri, 17 Sep 2010 22:59:46 +0200") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-XM-SPF: eid=;;;mid=;;;hst=in01.mta.xmission.com;;;ip=98.207.157.188;;;frm=ebiederm@xmission.com;;;spf=neutral X-SA-Exim-Connect-IP: 98.207.157.188 X-SA-Exim-Mail-From: ebiederm@xmission.com X-Spam-Report: * -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP * 1.5 XMNoVowels Alpha-numberic number with no vowels * -3.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * -0.0 DCC_CHECK_NEGATIVE Not listed in DCC * [sa07 1397; Body=1 Fuz1=1 Fuz2=1] * 0.4 UNTRUSTED_Relay Comes from a non-trusted relay X-Spam-DCC: XMission; sa07 1397; Body=1 Fuz1=1 Fuz2=1 X-Spam-Combo: ;"Hans J. Koch" X-Spam-Relay-Country: Subject: [PATCH 0/5] uio hotplug support X-Spam-Flag: No X-SA-Exim-Version: 4.2.1 (built Fri, 06 Aug 2010 16:31:04 -0600) X-SA-Exim-Scanned: Yes (on in01.mta.xmission.com) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Implement the ability to hotunplug a uio device while file handles are still open without crashing. I have written the code very carefully, and this survives my basic testing. So at the very least this is better than what is present in uio today. I have implemented the ``locking'' for hotunplug support in a generic library, that should be reusable to make this kind of support easier to add in other pieces of the kernel. Eric W. Biederman (5): uio: Simplify the lifetime logic of struct uio_device. uio: Kill unused vma_count. uio: Remove unused uio_info mmap method. libunload: A library to help remove open files uio: Implement hotunplug support, using libunload --- drivers/uio/uio.c | 326 ++++++++++++++++++++++++++++++-------------- fs/Makefile | 2 +- fs/libunload.c | 166 ++++++++++++++++++++++ include/linux/uio_driver.h | 11 +-- include/linux/unload.h | 33 +++++ 5 files changed, 426 insertions(+), 112 deletions(-)