From owner-freebsd-stable@FreeBSD.ORG Thu Jan 31 17:56:01 2008 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 3972516A4CA for ; Thu, 31 Jan 2008 17:56:01 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from speedfactory.net (mail.speedfactory.net [66.23.216.219]) by mx1.freebsd.org (Postfix) with ESMTP id 20FF913C43E for ; Thu, 31 Jan 2008 17:53:28 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from server.baldwin.cx (unverified [66.23.211.162]) by speedfactory.net (SurgeMail 3.8s) with ESMTP id 230349749-1834499 for multiple; Thu, 31 Jan 2008 12:51:13 -0500 Received: from localhost.corp.yahoo.com (john@localhost [127.0.0.1]) (authenticated bits=0) by server.baldwin.cx (8.14.2/8.14.2) with ESMTP id m0VHqIAq021271; Thu, 31 Jan 2008 12:52:26 -0500 (EST) (envelope-from jhb@freebsd.org) From: John Baldwin To: Andriy Gapon Date: Thu, 31 Jan 2008 11:52:39 -0500 User-Agent: KMail/1.9.7 References: <47A0B642.9060000@icyb.net.ua> <47A1C198.6090802@icyb.net.ua> <47A1E3D5.6040301@icyb.net.ua> In-Reply-To: <47A1E3D5.6040301@icyb.net.ua> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200801311152.40064.jhb@freebsd.org> X-Greylist: Sender succeeded SMTP AUTH authentication, not delayed by milter-greylist-2.0.2 (server.baldwin.cx [127.0.0.1]); Thu, 31 Jan 2008 12:52:26 -0500 (EST) X-Virus-Scanned: ClamAV 0.91.2/5628/Thu Jan 31 11:48:19 2008 on server.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-4.4 required=4.2 tests=ALL_TRUSTED,AWL,BAYES_00 autolearn=ham version=3.1.3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on server.baldwin.cx Cc: freebsd-stable@freebsd.org Subject: Re: kld regression X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 31 Jan 2008 17:56:01 -0000 On Thursday 31 January 2008 10:05:57 am Andriy Gapon wrote: > on 31/01/2008 14:39 Andriy Gapon said the following: > > on 31/01/2008 13:07 John Baldwin said the following: > >> On Wednesday 30 January 2008 12:39:14 pm Andriy Gapon wrote: > >>> The problem is as follows: > >>> 1. put udf_load="YES" in loader.conf > >>> 2. you can mount and unmount udf filesystems > >>> 3. you can kldunload udf if no udf filesystems are mounted > >>> 4. now mount udf fs while udf.ko is unloaded > >>> 5. udf is auto loaded and fs is mounted > >>> 6. unmount fs > >>> 7. try to kldunload udf > >>> kldunload: can't unload file: Device busy > >>> kernel message: kldunload: attempt to unload file that was loaded by the > >>> kernel > >>> > >>> Yeah, it was loaded by kernel indeed, but WTF - what is the difference > >>> from manual/loader.conf loading and why I can not manage my modules as I > >>> wish? > >> Hmm, the relevant code (vfs_init.c) hasn't changed in 6.x since 6.0. There > >> were some changes in 7.0, but this should work in both branches. What is the > >> previous release that this worked on? > >> > > > > Maybe I was wrong when I called this regression, but this was very > > surprising behavior for me. And in 5.X I did a lot of udf > > debugging/experimenting and never encountered such a problem. Maybe I > > always did kldload before mount, I can't tell now. > > Anyway, this seems like an annoyance at the very least, pinning a kernel > > module without any important reasons. > > > > Hmm, I found one difference with previous setups: in step 1 I also have > udf_iconv_load="YES" and udf_iconv.ko module is what seems to prevent > udf.ko from unloading in step 7. I can actually unload udf_iconv and > then I am able again to unload udf. > > Still don't understand what is a big difference here. > > And if I had UDF_ICONV built into kernel then I wouldn't have this > work-around. Ah, I don't think we can safely unload modules loaded from the loader IIRC. -- John Baldwin