Re: NFS mount attempts hangs with btrfs on server side

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On Wednesday 2010-04-21 12:25, Manio wrote:
> On 2010-04-17 22:10, manio wrote:
>>> Greetings.
>>>
>>> I am observing a case whereby NFS mounting seems to hang. A tcpdump
>>> trace reveals that it retries forever RPC and exchanging NFS messages
>>> without giving any warning or error message about what's wrong. There is
>>> no firewall active, and the NFSserver (.1) has the client (.101)
>>> unconditionally allowed.
>>>
>>> It's a simple
>>> mount -t nfs 192.168.100.1:/B/home/jengelh /home/jengelh -o tcp,intr,soft
>>>
>>> /B is a btrfs volume. Mounting an ext4 volume over NFS instead completes
>>> in a splitsecond.
>>
>> Hello
>> I have very similar behavior. On the server side i have nfs kernel server
>> (nfs version 3) - when mounting ext3 directories - all works fine,
>> but when i export btrfs directory and try to mount it:
>> on client side (debian sid) i've got:
>> mount.nfs: Connection timed out
>> and during mounting time on server side (debian lenny):
>> about 20 lines with: "authenticated mount request ..."
>>
>
> Hello
> Now i can reply myself - i hope it could be helpful to someone :)
> The problem was: old nfs-utils and/or userland (portmap and stuff
> like that).

I'd rather have a real description rather than "stuff like that".
Since I am not on debian, "old nfs-utils" would not happen -
rpcbind-0.1.6+git20080930 and nfs-kernel-server-1.1.3
should be very much recent enough.
Especially since exportability of filesystems is usually not
so much a userspace thing.

>First i was trying to repeat mounting on debian sid
> and it works - so i finally decided to bring up my debian stable
> to squeeze - and it is working now!! :)
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