Commit d531c008 authored by Kinglong Mee's avatar Kinglong Mee Committed by J. Bruce Fields
Browse files

NFSD/SUNRPC: Check rpc_xprt out of xs_setup_bc_tcp



Besides checking rpc_xprt out of xs_setup_bc_tcp,
increase it's reference (it's important).
Signed-off-by: default avatarKinglong Mee <kinglongmee@gmail.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 83ddfebd
......@@ -32,6 +32,7 @@
*/
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/xprt.h>
#include <linux/sunrpc/svc_xprt.h>
#include <linux/slab.h>
#include "nfsd.h"
......@@ -635,6 +636,22 @@ static struct rpc_cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc
}
}
static struct rpc_clnt *create_backchannel_client(struct rpc_create_args *args)
{
struct rpc_xprt *xprt;
if (args->protocol != XPRT_TRANSPORT_BC_TCP)
return rpc_create(args);
xprt = args->bc_xprt->xpt_bc_xprt;
if (xprt) {
xprt_get(xprt);
return rpc_create_xprt(args, xprt);
}
return rpc_create(args);
}
static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses)
{
struct rpc_timeout timeparms = {
......@@ -674,7 +691,7 @@ static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *c
args.authflavor = ses->se_cb_sec.flavor;
}
/* Create RPC client */
client = rpc_create(&args);
client = create_backchannel_client(&args);
if (IS_ERR(client)) {
dprintk("NFSD: couldn't create callback client: %ld\n",
PTR_ERR(client));
......
......@@ -295,13 +295,24 @@ int xprt_adjust_timeout(struct rpc_rqst *req);
void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
void xprt_release(struct rpc_task *task);
struct rpc_xprt * xprt_get(struct rpc_xprt *xprt);
void xprt_put(struct rpc_xprt *xprt);
struct rpc_xprt * xprt_alloc(struct net *net, size_t size,
unsigned int num_prealloc,
unsigned int max_req);
void xprt_free(struct rpc_xprt *);
/**
* xprt_get - return a reference to an RPC transport.
* @xprt: pointer to the transport
*
*/
static inline struct rpc_xprt *xprt_get(struct rpc_xprt *xprt)
{
if (atomic_inc_not_zero(&xprt->count))
return xprt;
return NULL;
}
static inline __be32 *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 *p)
{
return p + xprt->tsh_size;
......
......@@ -1383,15 +1383,3 @@ void xprt_put(struct rpc_xprt *xprt)
if (atomic_dec_and_test(&xprt->count))
xprt_destroy(xprt);
}
/**
* xprt_get - return a reference to an RPC transport.
* @xprt: pointer to the transport
*
*/
struct rpc_xprt *xprt_get(struct rpc_xprt *xprt)
{
if (atomic_inc_not_zero(&xprt->count))
return xprt;
return NULL;
}
......@@ -2923,15 +2923,6 @@ 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
* transport; 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,
xprt_tcp_slot_table_entries);
if (IS_ERR(xprt))
......
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