[PATCH] kNFSd: Fix problem with stale filehandles.

From: NeilBrown <neilb@cse.unsw.edu.au>

nfsd_setuser was not called until after filehandle lookup was done, so
filehandle lookup would use the wrong userid, and so the permission checking
in nfsd_acceptable would be bogus.

fs/nfsd/nfsfh.c

@@ -164,6 +164,9 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
 			goto out;
 		}
 
+		/* Set user creds for this exportpoint */
+		nfsd_setuser(rqstp, exp);
+
 		/*
 		 * Look up the dentry using the NFS file handle.
 		 */
@@ -224,9 +227,6 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
 	inode = dentry->d_inode;
 
 
-	/* Set user creds for this exportpoint */
-	nfsd_setuser(rqstp, exp);
-
 	/* Type check. The correct error return for type mismatches
 	 * does not seem to be generally agreed upon. SunOS seems to
 	 * use EISDIR if file isn't S_IFREG; a comment in the NFSv3