Re: kld regression

on 31/01/2008 18:52 John Baldwin said the following:
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,

maybe there is a small misunderstanding:
1. udf.ko and udf_iconv.ko are both loaded by loader - I *can* unload udf.ko
2. udf_iconv.ko is loaded by loader but udf.ko is auto-loaded (by
whatever) when I do mount_udf - I can not unload udf.ko unless I unload
udf_iconv.ko.

This is inconsistent and there is no obvious reason for things being
this way.


--
Andriy Gapon
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    (freebsd-stable)
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