Why cannot I do "insmod nfsd.ko" directly?

Why cannot I do "insmod nfsd.ko" directly?

[Xin Zhao]

I tried to do "insmod nfsd.ko", but always got the error message
"insmod: error inserting 'nfsd.ko': -1 Unknown symbol in module"

Why?

The kernel is 2.6.11.10
The command I used is:
1. insmod lockd.ko  ---succeed
2. exportfs -r   ---succeed
3. insmod nfsd.ko --- failed 


Moreover, I noticed that if I do the following commands, nfsd.ko can
be inserted:

1. rpc.mountd
2. exportfs -r
3. rpc.nfsd 1

Can someone explain what trick rpc.mountd and rpc.nfsd do to make
nfsd.ko insertable?

Thanks in advance for your kind help!

-x

Re: Why cannot I do "insmod nfsd.ko" directly?

[randy_dunlap]

On Tue, 5 Jul 2005 14:23:39 -0400 Xin Zhao wrote:

| I tried to do "insmod nfsd.ko", but always got the error message
| "insmod: error inserting 'nfsd.ko': -1 Unknown symbol in module"

The kernel message log would at least tell you what symbol
is missing and then you/we can determnine why and where that
symbol is located.  Maybe there's just another module that needs
to be loaded before nfsd.ko.  And try using modprobe instead
of insmod since modprobe will look for module dependencies.


| Why?
| 
| The kernel is 2.6.11.10
| The command I used is:
| 1. insmod lockd.ko  ---succeed
| 2. exportfs -r   ---succeed
| 3. insmod nfsd.ko --- failed 
| 
| 
| Moreover, I noticed that if I do the following commands, nfsd.ko can
| be inserted:
| 
| 1. rpc.mountd
| 2. exportfs -r
| 3. rpc.nfsd 1
| 
| Can someone explain what trick rpc.mountd and rpc.nfsd do to make
| nfsd.ko insertable?
| 
| Thanks in advance for your kind help!


---
~Randy

Re: Why cannot I do "insmod nfsd.ko" directly?

[Horst von Brand]

Xin Zhao <uszhaoxin@gmail.com> wrote:
> I tried to do "insmod nfsd.ko", but always got the error message
> "insmod: error inserting 'nfsd.ko': -1 Unknown symbol in module"

Use modprobe(8), it knows about module dependencies and what to load.
-- 
Dr. Horst H. von Brand                   User #22616 counter.li.org
Departamento de Informatica                     Fono: +56 32 654431
Universidad Tecnica Federico Santa Maria              +56 32 654239
Casilla 110-V, Valparaiso, Chile                Fax:  +56 32 797513

Re: Why cannot I do "insmod nfsd.ko" directly?

[Xin Zhao]

I just found the problem. I have to insmod exportfs.ko first. 

I can certainly use modprobe, but what I really want to do is to use
my own nfsd.ko instead of the default one.  But my nfsd.ko is not in
the default /lib/module/... directory. So if I use modprobe, it will
complaint cannot find nfsd.ko.

How to do this? Thanks!

-x

On 7/5/05, Horst von Brand <vonbrand@inf.utfsm.cl> wrote:
> Xin Zhao <uszhaoxin@gmail.com> wrote:
> > I tried to do "insmod nfsd.ko", but always got the error message
> > "insmod: error inserting 'nfsd.ko': -1 Unknown symbol in module"
> 
> Use modprobe(8), it knows about module dependencies and what to load.
> --
> Dr. Horst H. von Brand                   User #22616 counter.li.org
> Departamento de Informatica                     Fono: +56 32 654431
> Universidad Tecnica Federico Santa Maria              +56 32 654239
> Casilla 110-V, Valparaiso, Chile                Fax:  +56 32 797513
>