Re: Error mounting FC8 NFS server with 2.6.31-rc3 NFSv4 client.

[Andy Adamson <andros@netapp.com>]

On Jul 21, 2009, at 5:17 PM, Trond Myklebust wrote:

> On Tue, 2009-07-21 at 11:32 -0700, Ben Greear wrote:
>> On 07/21/2009 11:28 AM, Trond Myklebust wrote:
>>> On Tue, 2009-07-21 at 11:01 -0700, Ben Greear wrote:
>>>> On 07/21/2009 10:59 AM, Trond Myklebust wrote:
>>>>> On Tue, 2009-07-21 at 10:36 -0700, Ben Greear wrote:
>>>>>> On 07/21/2009 10:12 AM, Trond Myklebust wrote:
>>>>>>> On Tue, 2009-07-21 at 09:49 -0700, Ben Greear wrote:
>>>>>>>> On 07/21/2009 05:15 AM, Trond Myklebust wrote:
>>>>>>>>
>>>>>>>>> What does /var/lib/nfs/v4recovery look like on the server?
>>>>>>>> The server was misconfigured, but I still think the client  
>>>>>>>> should
>>>>>>>> behave better in this case.  If you cannot reproduce it, let  
>>>>>>>> me know
>>>>>>>> and I can try to be more specific.  If you still want the  
>>>>>>>> v4recovery
>>>>>>>> information, let me know and I'll send it.
>>>>>>> So how should the client behave, when a screwed up server  
>>>>>>> allows it to
>>>>>>> mount but starts returning illegal values for setclientid? The  
>>>>>>> only
>>>>>>> thing I can see we could do is to tell the user EINSANESERVER...
>>>>>> Well, it could just fail the mount and give up and not overly  
>>>>>> spam
>>>>>> /var/log/messages in a tight loop perhaps?
>>>>> This doesn't happen at mount time. It happens when you open a  
>>>>> file.
>>>> Not for me, and evidently not for the other person that reported
>>>> similar results.  All I had to do was attempt the mount (which  
>>>> never
>>>> completed).
>>>>
>>>> Thanks,
>>>> Ben
>>>
>>> Ah... You have NFS_V4_1 enabled despite the Kconfig warning...  
>>> Does the
>>> bug occur when you turn this off too?
>>
>> Yes, it did.
>
> OK. The following patch should fix that particular regression.
>
> Note that there is a bug remaining inside nfs4_init_session(): we
> shouldn't be copying the rsize/wsize into the nfs_client if the latter
> was already initialised.

The rsize/wsize is copied into the session prior to the create_session  
call (triggered by the state management code you moved), and is used  
for session negotiation. At this point the nfs_client cl_cons_state is  
set to NFS_CS_SESSION_INITING (see nfs4_alloc_session), so the  
nfs_client is not initialized.  The cl_cons_state is set to  
NFS_CS_READY after a successful create_session call.

-->Andy

> I'm going to leave that for the moment, though,
> since that bug wasn't introduced by my patch, and it doesn't affect
> NFSv4.0.
>
> Cheers,
>  Trond
> -----------------------------------------------------------------
> From: Trond Myklebust <Trond.Myklebust@netapp.com>
> NFSv4: Fix an NFSv4 mount regression
>
> Commit 008f55d0e019943323c20a03493a2ba5672a4cc8 (nfs41: recover  
> lease in
> _nfs4_lookup_root) forces the state manager to always run on mount.  
> This is
> a bug in the case of NFSv4.0, which doesn't require us to send a
> setclientid until we want to grab file state.
>
> In any case, this is completely the wrong place to be doing state
> management. Moving that code into nfs4_init_session...
>
> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
> ---
>
> fs/nfs/client.c   |   18 +++---------------
> fs/nfs/nfs4_fs.h  |    6 ++++++
> fs/nfs/nfs4proc.c |   24 +++++++++++++++++-------
> 3 files changed, 26 insertions(+), 22 deletions(-)
>
>
> diff --git a/fs/nfs/client.c b/fs/nfs/client.c
> index c2d0616..8d25ccb 100644
> --- a/fs/nfs/client.c
> +++ b/fs/nfs/client.c
> @@ -1242,20 +1242,6 @@ error:
> 	return error;
> }
>
> -/*
> - * Initialize a session.
> - * Note: save the mount rsize and wsize for create_server  
> negotiation.
> - */
> -static void nfs4_init_session(struct nfs_client *clp,
> -			      unsigned int wsize, unsigned int rsize)
> -{
> -#if defined(CONFIG_NFS_V4_1)
> -	if (nfs4_has_session(clp)) {
> -		clp->cl_session->fc_attrs.max_rqst_sz = wsize;
> -		clp->cl_session->fc_attrs.max_resp_sz = rsize;
> -	}
> -#endif /* CONFIG_NFS_V4_1 */
> -}
>
> /*
>  * Session has been established, and the client marked ready.
> @@ -1350,7 +1336,9 @@ struct nfs_server *nfs4_create_server(const  
> struct nfs_parsed_mount_data *data,
> 	BUG_ON(!server->nfs_client->rpc_ops);
> 	BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
>
> -	nfs4_init_session(server->nfs_client, server->wsize, server->rsize);
> +	error = nfs4_init_session(server);
> +	if (error < 0)
> +		goto error;
>
> 	/* Probe the root fh to retrieve its FSID */
> 	error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
> diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
> index 61bc3a3..6ea07a3 100644
> --- a/fs/nfs/nfs4_fs.h
> +++ b/fs/nfs/nfs4_fs.h
> @@ -220,6 +220,7 @@ extern void nfs4_destroy_session(struct  
> nfs4_session *session);
> extern struct nfs4_session *nfs4_alloc_session(struct nfs_client  
> *clp);
> extern int nfs4_proc_create_session(struct nfs_client *, int reset);
> extern int nfs4_proc_destroy_session(struct nfs4_session *);
> +extern int nfs4_init_session(struct nfs_server *server);
> #else /* CONFIG_NFS_v4_1 */
> static inline int nfs4_setup_sequence(struct nfs_client *clp,
> 		struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
> @@ -227,6 +228,11 @@ static inline int nfs4_setup_sequence(struct  
> nfs_client *clp,
> {
> 	return 0;
> }
> +
> +static inline int nfs4_init_session(struct nfs_server *server)
> +{
> +	return 0;
> +}
> #endif /* CONFIG_NFS_V4_1 */
>
> extern struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[];
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index ff0c080..df24f67 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -2040,15 +2040,9 @@ static int _nfs4_lookup_root(struct  
> nfs_server *server, struct nfs_fh *fhandle,
> 		.rpc_argp = &args,
> 		.rpc_resp = &res,
> 	};
> -	int status;
>
> 	nfs_fattr_init(info->fattr);
> -	status = nfs4_recover_expired_lease(server);
> -	if (!status)
> -		status = nfs4_check_client_ready(server->nfs_client);
> -	if (!status)
> -		status = nfs4_call_sync(server, &msg, &args, &res, 0);
> -	return status;
> +	return nfs4_call_sync(server, &msg, &args, &res, 0);
> }
>
> static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh  
> *fhandle,
> @@ -4793,6 +4787,22 @@ int nfs4_proc_destroy_session(struct  
> nfs4_session *session)
> 	return status;
> }
>
> +int nfs4_init_session(struct nfs_server *server)
> +{
> +	struct nfs_client *clp = server->nfs_client;
> +	int ret;
> +
> +	if (!nfs4_has_session(clp))
> +		return 0;
> +
> +	clp->cl_session->fc_attrs.max_rqst_sz = server->wsize;
> +	clp->cl_session->fc_attrs.max_resp_sz = server->rsize;
> +	ret = nfs4_recover_expired_lease(server);
> +	if (!ret)
> +		ret = nfs4_check_client_ready(clp);
> +	return ret;
> +}
> +
> /*
>  * Renew the cl_session lease.
>  */
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-nfs"  
> in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html