Date: Thu, 31 Jan 2008 17:05:57 +0200 From: Andriy Gapon <avg@icyb.net.ua> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: kld regression Message-ID: <47A1E3D5.6040301@icyb.net.ua> In-Reply-To: <47A1C198.6090802@icyb.net.ua> References: <47A0B642.9060000@icyb.net.ua> <200801310607.55346.jhb@freebsd.org> <47A1C198.6090802@icyb.net.ua>
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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
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