SUNRPC: add netns refcount tracker to struct svc_xprt

struct svc_xprt holds a long lived reference to a netns,
it is worth tracking it.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h
index 571f605..382af90 100644 (file)
--- a/include/linux/sunrpc/svc_xprt.h
+++ b/include/linux/sunrpc/svc_xprt.h
@@ -88,6 +88,7 @@ struct svc_xprt {
        struct list_head        xpt_users;      /* callbacks on free */
 
        struct net              *xpt_net;
+       netns_tracker           ns_tracker;
        const struct cred       *xpt_cred;
        struct rpc_xprt         *xpt_bc_xprt;   /* NFSv4.1 backchannel */
        struct rpc_xprt_switch  *xpt_bc_xps;    /* NFSv4.1 backchannel */

diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index b21ad79..db878e8 100644 (file)
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -162,7 +162,7 @@ static void svc_xprt_free(struct kref *kref)
        if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags))
                svcauth_unix_info_release(xprt);
        put_cred(xprt->xpt_cred);
-       put_net(xprt->xpt_net);
+       put_net_track(xprt->xpt_net, &xprt->ns_tracker);
        /* See comment on corresponding get in xs_setup_bc_tcp(): */
        if (xprt->xpt_bc_xprt)
                xprt_put(xprt->xpt_bc_xprt);
@@ -198,7 +198,7 @@ void svc_xprt_init(struct net *net, struct svc_xprt_class *xcl,
        mutex_init(&xprt->xpt_mutex);
        spin_lock_init(&xprt->xpt_lock);
        set_bit(XPT_BUSY, &xprt->xpt_flags);
-       xprt->xpt_net = get_net(net);
+       xprt->xpt_net = get_net_track(net, &xprt->ns_tracker, GFP_ATOMIC);
        strcpy(xprt->xpt_remotebuf, "uninitialized");
 }
 EXPORT_SYMBOL_GPL(svc_xprt_init);