nfsd: per-net NFSd up flag introduced

This patch introduces introduces per-net "nfsd_net_up" boolean flag, which has
the same purpose as general "nfsd_up" flag - skip init or shutdown of per-net
resources in case of they are inited on shutted down respectively.
Signed-off-by: NStanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

fs/nfsd/netns.h

@@ -92,6 +92,8 @@ struct nfsd_net {
 
 	time_t nfsd4_lease;
 	time_t nfsd4_grace;
+
+	bool nfsd_net_up;
 };
 
 /* Simple check to find out if a given net was properly initialized */

fs/nfsd/nfssvc.c

@@ -21,6 +21,7 @@
 #include "nfsd.h"
 #include "cache.h"
 #include "vfs.h"
+#include "netns.h"
 
 #define NFSDDBG_FACILITY	NFSDDBG_SVC
 
@@ -205,8 +206,12 @@ static bool nfsd_up = false;
 
 static int nfsd_startup_net(struct net *net)
 {
+	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 	int ret;
 
+	if (nn->nfsd_net_up)
+		return 0;
+
 	ret = nfsd_init_socks(net);
 	if (ret)
 		return ret;
@@ -217,6 +222,7 @@ static int nfsd_startup_net(struct net *net)
 	if (ret)
 		goto out_lockd;
 
+	nn->nfsd_net_up = true;
 	return 0;
 
 out_lockd:
@@ -257,8 +263,14 @@ static int nfsd_startup(int nrservs, struct net *net)
 
 static void nfsd_shutdown_net(struct net *net)
 {
+	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+	if (!nn->nfsd_net_up)
+		return;
+
 	nfs4_state_shutdown_net(net);
 	lockd_down(net);
+	nn->nfsd_net_up = false;
 }
 
 static void nfsd_shutdown(struct net *net)