Re: 2.4.17:Increase number of anonymous filesystems beyond 256?

[Rainer Krienke]

On Thursday, 17. January 2002 19:55, Pete Zaitcev wrote:
> >[from linux-kernel]
> > I have to increase the number of anonymous filesystems the kernel can
> > handle and found the array unnamed_dev_in_use fs/super.c and changed the
> > array size from the default of 256 to 1024. Testing this patch by
> > mounting more and more NFS-filesystems I found that still no more than
> > 800 NFS mounts are possible. One more mount results in the kernel saying:
> >
> > Jan 17 14:03:11 gl kernel: RPC: Can't bind to reserved port (98).
> > Jan 17 14:03:11 gl kernel: NFS: cannot create RPC transport.
> > Jan 17 14:03:11 gl kernel: nfs warning: mount version older than kernel
>
> I did that. You also need a small fix to mount(8) that adds
> a mount argument "-o nores". I've got an RPM at my website.
>
> Initially I did a sysctl, but Trond M. asked for a mount
> argument, in case you have to mount from several servers,
> some of which require reserved ports, some do not.
> Our NetApps work ok with non-reserved ports on clients.

Thanks. In between I tested the patch and it works but seems to have a 
painful side effect. Using the patch I can now mount more than 256 NFS 
filesystems on the patched host.

The trouble is, that no other machine can NFS mount anything from this 
patched machine. This is because nfsd cannot be started any longer (kernel 
nfsd) on the patches server. When I try to start rpc.nfsd on this patched 
host you see the following in /var/log/messages:

portmap: connect from 127.0.0.1 to set(nfs): request from unprivileged port
rpc.nfsd: nfssvc: error Permission denied

A strace of nfsd shows the problem:
...
nfsservctl(0, 0xbfffeed8, 0) = -1 EACCES (Permission denied)
...

Anyone know how this can be fixed?

Thanks Rainer
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Rainer Krienke                     [e-mail]
Universitaet Koblenz, 		   http://www.uni-koblenz.de/~krienke
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