1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 965d6c20086e..64f3d60c72af 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -144,8 +144,11 @@ extern u32 svc_max_payload(const struct svc_rqst *rqstp);
  *
  * Each request/reply pair can have at most one "payload", plus two pages,
  * one for the request, and one for the reply.
+ * We using ->sendfile to return read data, we might need one extra page
+ * if the request is not page-aligned.  So add another '1'.
  */
-#define RPCSVC_MAXPAGES         ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE + 2)
+#define RPCSVC_MAXPAGES         ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE \
+                                + 2 + 1)
 
 static inline u32 svc_getnl(struct kvec *iov)
 {