SUNRPC: Add a helper for encoding opaque data inline

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index 7e609de34d85..a43c3b6455b6 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -319,6 +319,31 @@ xdr_stream_encode_u64(struct xdr_stream *xdr, __u64 n)
 }
 
 /**
+ * xdr_stream_encode_opaque_inline - Encode opaque xdr data
+ * @xdr: pointer to xdr_stream
+ * @ptr: pointer to void pointer
+ * @len: size of object
+ *
+ * Return values:
+ *   On success, returns length in bytes of XDR buffer consumed
+ *   %-EMSGSIZE on XDR buffer overflow
+ */
+static inline ssize_t
+xdr_stream_encode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t len)
+{
+        size_t count = sizeof(__u32) + xdr_align_size(len);
+        __be32 *p = xdr_reserve_space(xdr, count);
+
+        if (unlikely(!p)) {
+                *ptr = NULL;
+                return -EMSGSIZE;
+        }
+        xdr_encode_opaque(p, NULL, len);
+        *ptr = ++p;
+        return count;
+}
+
+/**
  * xdr_stream_encode_opaque_fixed - Encode fixed length opaque xdr data
  * @xdr: pointer to xdr_stream
  * @ptr: pointer to opaque data object