Re: [PATCH 13/20] NFS: Fix recovery from NFS4ERR_CLID_INUSE

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

On Apr 26, 2012, at 2:53 PM, Myklebust, Trond wrote:

> On Thu, 2012-04-26 at 14:43 -0400, Chuck Lever wrote:
>> On Apr 26, 2012, at 12:55 PM, Myklebust, Trond wrote:
>>> On Thu, 2012-04-26 at 12:24 -0400, Chuck Lever wrote:
>>>> On Apr 23, 2012, at 4:55 PM, Chuck Lever wrote:
>>> Then lets move the flavour out of the clientid string,
>> Removing the flavor from the nfs_client_id4 string makes sense.
>>> and just settle
>>> for handling CLID_INUSE by changing the flavour on the SETCLIENTID call.
>> This is where I get hazy.  
>> If I simply change the authentication flavor on the existing clp->cl_rpcclient, will this affect ongoing RENEW operations that also use this transport?  Do we want subsequent RENEW operations to use the new flavor?
>> Thinking hypothetically, it seems to me that CLID_INUSE is really an indication of a permanent configuration error, or a software bug, and we should not bother to recover.  But maybe that's my limited imagination.  Under what use cases do you think CLID_INUSE might occur and it might be useful to attempt recovery?
> The server caches the principal name that was used to call SETCLIENTID
> when the lease was established. Any attempt to call SETCLIENTID with a
> different principal will result in CLID_INUSE unless the lease has
> expired.
> So what I was proposing wasn't that you try to change the authentication
> flavour on an existing nfs_client. It was that when you are probing, you
> can use the CLID_INUSE reply from SETCLIENTID as a direct indication
> that the server is indeed trunked, and that you already hold a lease on
> that server, but that the authentication flavour that you are trying to
> use is wrong.

The use case would be that my client has mounted a server via address X using authentication flavor 1, and then tries to mount the same server via address Y using authentication flavor 2.

Do we even need to retry the SETCLIENTID and to perform a SETCLIENTID_CONFIRM in that case?

Now, what about nfs4_reclaim_lease() ?  If the client sees CLID_INUSE during a lease reclaim, no trunking discovery is involved.

Chuck Lever

To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at

[Linux USB Development]     [Linux Media Development]     [Video for Linux]     [Linux NILFS]     [Linux Audio Users]     [Photo]     [Yosemite Info]    [Yosemite Photos]    [POF Sucks]     [Linux Kernel]     [Linux SCSI]     [XFree86]

Add to Google Powered by Linux