SUNRPC: Don't truncate tail data unnecessarily in xdr_shrink_pagelen
If we have unused buffer space, then we should make use of that rather
than unnecessarily truncating the message.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 3317db3..3bbef7f 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -396,12 +396,21 @@
struct kvec *tail;
size_t copy;
unsigned int pglen = buf->page_len;
+ unsigned int tailbuf_len;
tail = buf->tail;
BUG_ON (len > pglen);
+ tailbuf_len = buf->buflen - buf->head->iov_len - buf->page_len;
+
/* Shift the tail first */
- if (tail->iov_len != 0) {
+ if (tailbuf_len != 0) {
+ unsigned int free_space = tailbuf_len - tail->iov_len;
+
+ if (len < free_space)
+ free_space = len;
+ tail->iov_len += free_space;
+
copy = len;
if (tail->iov_len > len) {
char *p = (char *)tail->iov_base + len;