From owner-freebsd-stable@FreeBSD.ORG Thu Jan 31 15:06:01 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 7B72D16A46B; Thu, 31 Jan 2008 15:06:01 +0000 (UTC) (envelope-from avg@icyb.net.ua) Received: from falcon.cybervisiontech.com (falcon.cybervisiontech.com [217.20.163.9]) by mx1.freebsd.org (Postfix) with ESMTP id E42BC13C442; Thu, 31 Jan 2008 15:06:00 +0000 (UTC) (envelope-from avg@icyb.net.ua) Received: from localhost (localhost [127.0.0.1]) by falcon.cybervisiontech.com (Postfix) with ESMTP id CADDE43E42B; Thu, 31 Jan 2008 17:05:58 +0200 (EET) X-Virus-Scanned: Debian amavisd-new at falcon.cybervisiontech.com Received: from falcon.cybervisiontech.com ([127.0.0.1]) by localhost (falcon.cybervisiontech.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hEJ5vcjvAXEM; Thu, 31 Jan 2008 17:05:58 +0200 (EET) Received: from [10.2.1.87] (gateway.cybervisiontech.com.ua [88.81.251.18]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by falcon.cybervisiontech.com (Postfix) with ESMTP id 700B743E301; Thu, 31 Jan 2008 17:05:58 +0200 (EET) Message-ID: <47A1E3D5.6040301@icyb.net.ua> Date: Thu, 31 Jan 2008 17:05:57 +0200 From: Andriy Gapon User-Agent: Thunderbird 2.0.0.9 (X11/20080123) MIME-Version: 1.0 To: John Baldwin References: <47A0B642.9060000@icyb.net.ua> <200801310607.55346.jhb@freebsd.org> <47A1C198.6090802@icyb.net.ua> In-Reply-To: <47A1C198.6090802@icyb.net.ua> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit 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 15:06:01 -0000 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. -- Andriy Gapon