Re: [NFS] attempt to use V1 mount protocol on V3 server

[Trond Myklebust]

>>>>> " " == Pascal Schmidt <der.eremit@xxxxxxxx> writes:

     > a) when unmounting an NFS volume, the server gets sent an umount
     >    request indicating version 1 of the protocol, sending a
     >    version 3 umount is not even attempted

     > b) when something goes wrong during the NFSv3 mount, the kernel
     >    seems to fall back to NFSv2, re-attempting the mount with
     >    mount protocol version 1

     > I think both of this should not be done when the remote side
     > does not advertise mount protocol version 1 support.

     > Question: is this a problem of the user-space mount utility or
     > is it an in-kernel problem?


  a) Is a feature of the 'mount' program. An NFS server should in any
     case not rely on the umount being sent: a client may have crashed
     or been firewalled, or whatever...

  b) Is a kernel feature which will never trigger if you are passing a
     correct filehandle from your mountd.

Cheers,
  Trond
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