svcrdma: Const-ify the xdr_buf arguments

Clean up: Ensure the code in rw.c does not modify the argument, and
enable callers to also use "const struct xdr_buf *".

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

diff --git a/net/sunrpc/xprtrdma/svc_rdma_rw.c b/net/sunrpc/xprtrdma/svc_rdma_rw.c
index 7c50edd..aeed4e2 100644 (file)
--- a/net/sunrpc/xprtrdma/svc_rdma_rw.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_rw.c
@@ -197,7 +197,7 @@ struct svc_rdma_write_info {
        __be32                  *wi_segs;
 
        /* SGL constructor arguments */
-       struct xdr_buf          *wi_xdr;
+       const struct xdr_buf    *wi_xdr;
        unsigned char           *wi_base;
        unsigned int            wi_next_off;
 
@@ -405,7 +405,7 @@ static void svc_rdma_pagelist_to_sg(struct svc_rdma_write_info *info,
                                    struct svc_rdma_rw_ctxt *ctxt)
 {
        unsigned int sge_no, sge_bytes, page_off, page_no;
-       struct xdr_buf *xdr = info->wi_xdr;
+       const struct xdr_buf *xdr = info->wi_xdr;
        struct scatterlist *sg;
        struct page **page;