rqst_exp_get_by_name(): constify path argument

Acked-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Author: Al Viro

fs/nfsd/export.c

@@ -1181,7 +1181,7 @@ __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp,
  * use exp_get_by_name() or exp_find().
  */
 struct svc_export *
-rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
+rqst_exp_get_by_name(struct svc_rqst *rqstp, const struct path *path)
 {
 	struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
 	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);

fs/nfsd/export.h

@@ -111,7 +111,7 @@ int			nfsd_export_init(struct net *);
 void			nfsd_export_shutdown(struct net *);
 void			nfsd_export_flush(struct net *);
 struct svc_export *	rqst_exp_get_by_name(struct svc_rqst *,
-					     struct path *);
+					     const struct path *);
 struct svc_export *	rqst_exp_parent(struct svc_rqst *,
 					struct path *);
 struct svc_export *	rqst_find_fsidzero_export(struct svc_rqst *);