[PATCH] NFS: supress warnings about NFS4ERR_OLD_STATEID in nfs4_handle_exception

[Jeff Layton <jlayton@redhat.com>]

I recently posted this patch to the nfs mailing list, but got no comment.
Reposting with an actual "[PATCH]" subject...

In certain situations, a NFSv4 client can end up with a set of racing calls
that cause the server to return a NFS4ERR_OLD_STATEID error. When this occurs,
the only real recourse that the client has is to retry the call. In the
current code, when this occurs, it triggers a useless printk (in
nfs4_map_errors):

    nfs4_map_errors could not handle NFSv4 error 10024

Trond recently mentioned that we really don't need to worry users with that
info. The following patch is based on a suggestion by Frank Filz and supresses
this error. Changing the return code here to 0 should be safe since all callers
of nfs4_handle_exception are expected to retry the call in this situation
anyway.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Frank Filz <ffilz@us.ibm.com>

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index f52cf5c..b456783 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2774,6 +2774,7 @@ int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct
 				break;
 		case -NFS4ERR_OLD_STATEID:
 			exception->retry = 1;
+			ret = 0;
 	}
 	/* We failed to handle the error */
 	return nfs4_map_errors(ret);
-
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