SUNRPC: mark bulk read/write data in xdrbuf

Adds a flag word to the xdrbuf struct which indicates any bulk
disposition of the data. This enables RPC transport providers to
marshal it efficiently/appropriately, and may enable other
optimizations.

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

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index c6b53d181bfa..0751c9464d0f 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -70,7 +70,10 @@ struct xdr_buf {
 
         struct page **  pages;          /* Array of contiguous pages */
         unsigned int    page_base,      /* Start of page data */
-                        page_len;       /* Length of page data */
+                        page_len,       /* Length of page data */
+                        flags;          /* Flags for data disposition */
+#define XDRBUF_READ             0x01            /* target of file read */
+#define XDRBUF_WRITE            0x02            /* source of file write */
 
         unsigned int    buflen,         /* Total length of storage buffer */
                         len;            /* Length of XDR encoded message */