Error mounting nfs clients

Error mounting nfs clients

[Albers, Lucas]

I have been running an nfs server for a number of months.
Every couple of days I get the following error message in my logs:

Hostname rpc.mountd: getfh failed: Operation not permitted

When this happens the clients are unable to mount the nfs exported volumes.
Restarting the service will fix the problem.


After researching the issue.
It appears that the error is related to the defined value:
	NFS_FHSIZE 
in the code listed below in this file:
/usr/src/linux-2.4.18-5/fs/nfsd/nfsctl.c

/*-----------------------------------------------------*/
        if (err == 0) {
                if (fh.fh_size > NFS_FHSIZE)
                        err = -EINVAL;
/*-----------------------------------------------------*/

It appears that raising the value:

#define NFS_FHSIZE      32

Defined in /usr/include/linux/nfs.h
Would fix the problem.

Server Information
Kernel 2.4.18-5 with NFS compiled in.
Clients are all 7.3 and 8.0 RedHat machines.
I am running 16 nfsd daemons on the server.
Usually between 200 and 280 clients are mounting volumes at one time.
Usually only between 20-30 clients are doing anything with their mounted
volumes.

Does anyone have any idea, what exactly is happening to cause this problem?


see complete code snippet below:
-------------------------------------

static inline int
nfsctl_getfh(struct nfsctl_fhparm *data, __u8 *res)
{
        struct sockaddr_in      *sin;
        struct svc_client       *clp;
        int                     err = 0;
        struct knfsd_fh         fh;

        if (data->gf_addr.sa_family != AF_INET)
                return -EPROTONOSUPPORT;
        if (data->gf_version < 2 || data->gf_version > NFSSVC_MAXVERS)
                return -EINVAL;
        sin = (struct sockaddr_in *)&data->gf_addr;

        exp_readlock();
        if (!(clp = exp_getclient(sin)))
                err = -EPERM;
        else
                err = exp_rootfh(clp, to_kdev_t(data->gf_dev), data->gf_ino,
NULL, &fh, NFS_FHSIZE);
        exp_readunlock();
/*-----------------------------------------------------*/
        if (err == 0) {
                if (fh.fh_size > NFS_FHSIZE)
                        err = -EINVAL;
/*-----------------------------------------------------*/
                else {
                        memset(res,0, NFS_FHSIZE);
                        memcpy(res, &fh.fh_base, fh.fh_size);
                }
        }

        return err;
}
-------------------------------------



> --Luke
> --Computer Science Sysadmin, MSU Bozeman 
> --admin(AT)cs.montana.edu 994-3931 



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Re: Error mounting nfs clients

[Trond Myklebust]

>>>>> " " == Lucas Albers <Albers> writes:

     > After researching the issue.  It appears that the error is
     > related to the defined value:
     > 	NFS_FHSIZE
     > in the code listed below in this file:
     > /usr/src/linux-2.4.18-5/fs/nfsd/nfsctl.c

     > /*-----------------------------------------------------*/
     >         if (err == 0) {
     >                 if (fh.fh_size > NFS_FHSIZE)
     >                         err = -EINVAL;
     > /*-----------------------------------------------------*/

     > It appears that raising the value:

     > #define NFS_FHSIZE 32

     > Defined in /usr/include/linux/nfs.h Would fix the problem.

If you do that, you will no longer be running NFSv2. Under NFSv2, file
handle sizes are 32 bytes long, no more, no less...

If the filesystem you are using needs to generate filehandles that are
greater that 32 bytes long, then you will probably only be able to use
it with NFSv3

Cheers,
  Trond


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