svc: Add transport hdr size for defer/revisit

Some transports have a header in front of the RPC header. The current
defer/revisit processing considers only the iov_len and arg_len to
determine how much to back up when saving the original request
to revisit. Add a field to the rqstp structure to save the size
of the transport header so svc_defer can correctly compute
the start of a request.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Acked-by: Neil Brown <neilb@suse.de>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Greg Banks <gnb@sgi.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 04eb20e2c344..742ab461d842 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -217,6 +217,7 @@ struct svc_rqst {
         void *                  rq_xprt_ctxt;   /* transport specific context ptr */
         struct svc_deferred_req*rq_deferred;    /* deferred request we are replaying */
 
+        size_t                  rq_xprt_hlen;   /* xprt header len */
         struct xdr_buf          rq_arg;
         struct xdr_buf          rq_res;
         struct page *           rq_pages[RPCSVC_MAXPAGES];
@@ -322,6 +323,7 @@ struct svc_deferred_req {
         size_t                  addrlen;
         union svc_addr_u        daddr;  /* where reply must come from */
         struct cache_deferred_req handle;
+        size_t                  xprt_hlen;
         int                     argslen;
         __be32                  args[0];
 };