Commit f0418aa4 authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

rpc: allow xprt_class->setup to return a preexisting xprt

This allows us to reuse the xprt associated with a server connection if
one has already been set up.
Signed-off-by: default avatarJ. Bruce Fields <>
parent 99de8ea9
......@@ -321,6 +321,7 @@ void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie);
#define XPRT_CLOSING (6)
static inline void xprt_set_connected(struct rpc_xprt *xprt)
......@@ -1102,6 +1102,9 @@ found:
return xprt;
if (test_and_set_bit(XPRT_INITIALIZED, &xprt->state))
/* ->setup returned a pre-initialized xprt: */
return xprt;
......@@ -2359,6 +2359,15 @@ static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
struct svc_sock *bc_sock;
struct rpc_xprt *ret;
if (args->bc_xprt->xpt_bc_xprt) {
* This server connection already has a backchannel
* export; we can't create a new one, as we wouldn't be
* able to match replies based on xid any more. So,
* reuse the already-existing one:
return args->bc_xprt->xpt_bc_xprt;
xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
if (IS_ERR(xprt))
return xprt;
......@@ -2396,15 +2405,6 @@ static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
* The backchannel uses the same socket connection as the
* forechannel
if (args->bc_xprt->xpt_bc_xprt) {
/* XXX: actually, want to catch this case... */
goto out_err;
* Once we've associated a backchannel xprt with a connection,
* we want to keep it around as long as long as the connection
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