SUNRPC: xdr_read_pages should return the amount of XDR encoded page data

Callers of xdr_read_pages() will want to know exactly how much XDR
data is encoded in the pages after the data realignment.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 5643feb6c64..80d518644cf 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -745,8 +745,10 @@ EXPORT_SYMBOL_GPL(xdr_inline_decode);
  * Moves data beyond the current pointer position from the XDR head[] buffer
  * into the page list. Any data that lies beyond current position + "len"
  * bytes is moved into the XDR tail[].
+ *
+ * Returns the number of XDR encoded bytes now contained in the pages
  */
-void xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
+unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
 {
         struct xdr_buf *buf = xdr->buf;
         struct kvec *iov;
@@ -756,7 +758,7 @@ void xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
         int padding;
 
         if (xdr->nwords == 0)
-                return;
+                return 0;
         if (nwords > xdr->nwords) {
                 nwords = xdr->nwords;
                 len = nwords << 2;
@@ -787,6 +789,7 @@ void xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
         xdr->end = (__be32 *)((char *)iov->iov_base + end);
         xdr->page_ptr = NULL;
         xdr->nwords = XDR_QUADLEN(end - padding);
+        return len;
 }
 EXPORT_SYMBOL_GPL(xdr_read_pages);
 
@@ -802,7 +805,7 @@ EXPORT_SYMBOL_GPL(xdr_read_pages);
  */
 void xdr_enter_page(struct xdr_stream *xdr, unsigned int len)
 {
-        xdr_read_pages(xdr, len);
+        len = xdr_read_pages(xdr, len);
         /*
          * Position current pointer at beginning of tail, and
          * set remaining message length.