xdr_encode_pages either leaves the tail iovec pointing to null or, if padding onthe page data is needed, sets it to point to a little bit of static data.  This
is a problem if we're expecting to later append some data in gss_wrap_req.
Modify xdr_encode_pages to make tail point to the end of the data in head, as
xdr_inline_pages and xdr_write_pages do.
 
 xdr.c |   13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)

diff -u --recursive --new-file linux-2.6.0-16-clnt_seqno_to_req/net/sunrpc/xdr.c linux-2.6.0-17-encode_pages_tail/net/sunrpc/xdr.c
--- linux-2.6.0-16-clnt_seqno_to_req/net/sunrpc/xdr.c	2003-12-10 15:29:31.000000000 -0500
+++ linux-2.6.0-17-encode_pages_tail/net/sunrpc/xdr.c	2003-12-10 15:52:01.000000000 -0500
@@ -107,16 +107,23 @@
 xdr_encode_pages(struct xdr_buf *xdr, struct page **pages, unsigned int base,
 		 unsigned int len)
 {
+	struct iovec *tail = xdr->tail;
+	u32 *p;
+
 	xdr->pages = pages;
 	xdr->page_base = base;
 	xdr->page_len = len;
 
+	p = (u32 *)xdr->head[0].iov_base + XDR_QUADLEN(xdr->head[0].iov_len);
+	tail->iov_base = p;
+	tail->iov_len = 0;
+
 	if (len & 3) {
-		struct iovec *iov = xdr->tail;
 		unsigned int pad = 4 - (len & 3);
 
-		iov->iov_base = (void *) "\0\0\0";
-		iov->iov_len  = pad;
+		*p = 0;
+		tail->iov_base = (char *)p + (len & 3);
+		tail->iov_len  = pad;
 		len += pad;
 	}
 	xdr->len += len;