NFSD: Ensure that xdr_write_pages updates rq_next_page

All other NFSv[23] procedures manage to keep page_ptr and
rq_next_page in lock step.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 762d7231e574..3b10636c51a9 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -509,6 +509,27 @@ static inline void svcxdr_init_encode(struct svc_rqst *rqstp)
 }
 
 /**
+ * svcxdr_encode_opaque_pages - Insert pages into an xdr_stream
+ * @xdr: xdr_stream to be updated
+ * @pages: array of pages to insert
+ * @base: starting offset of first data byte in @pages
+ * @len: number of data bytes in @pages to insert
+ *
+ * After the @pages are added, the tail iovec is instantiated pointing
+ * to end of the head buffer, and the stream is set up to encode
+ * subsequent items into the tail.
+ */
+static inline void svcxdr_encode_opaque_pages(struct svc_rqst *rqstp,
+					      struct xdr_stream *xdr,
+					      struct page **pages,
+					      unsigned int base,
+					      unsigned int len)
+{
+	xdr_write_pages(xdr, pages, base, len);
+	xdr->page_ptr = rqstp->rq_next_page - 1;
+}
+
+/**
  * svcxdr_set_auth_slack -
  * @rqstp: RPC transaction
  * @slack: buffer space to reserve for the transaction's security flavor