From ccdc28f81c91f7ef2dc6c28d27f50264b19e4dd5 Mon Sep 17 00:00:00 2001
From: Stanislav Kinsbursky <skinsbursky@parallels.com>
Date: Wed, 11 Jan 2012 19:18:09 +0400
Subject: [PATCH] SUNRPC: handle GSS AUTH pipes by network namespace aware
 routines

This patch makes RPC GSS PipeFs pipes allocated in it's RPC client owner
network namespace context.
Pipes creation and destruction now done in separated functions, which takes
care about PipeFS superblock locking.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---
 net/sunrpc/auth_gss/auth_gss.c | 95 ++++++++++++++++++++++++++--------
 1 file changed, 73 insertions(+), 22 deletions(-)

diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index f684ce606667..1a6fa9173519 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -757,6 +757,73 @@ gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
 	}
 }
 
+static void gss_pipes_dentries_destroy(struct rpc_auth *auth)
+{
+	struct gss_auth *gss_auth;
+
+	gss_auth = container_of(auth, struct gss_auth, rpc_auth);
+	rpc_unlink(gss_auth->pipe[0]->dentry);
+	rpc_unlink(gss_auth->pipe[1]->dentry);
+}
+
+static int gss_pipes_dentries_create(struct rpc_auth *auth)
+{
+	int err;
+	struct gss_auth *gss_auth;
+	struct rpc_clnt *clnt;
+
+	gss_auth = container_of(auth, struct gss_auth, rpc_auth);
+	clnt = gss_auth->client;
+
+	gss_auth->pipe[1]->dentry = rpc_mkpipe_dentry(clnt->cl_path.dentry,
+						      "gssd",
+						      clnt, gss_auth->pipe[1]);
+	if (IS_ERR(gss_auth->pipe[1]->dentry))
+		return PTR_ERR(gss_auth->pipe[1]->dentry);
+	gss_auth->pipe[0]->dentry = rpc_mkpipe_dentry(clnt->cl_path.dentry,
+						      gss_auth->mech->gm_name,
+						      clnt, gss_auth->pipe[0]);
+	if (IS_ERR(gss_auth->pipe[0]->dentry)) {
+		err = PTR_ERR(gss_auth->pipe[0]->dentry);
+		goto err_unlink_pipe_1;
+	}
+	return 0;
+
+err_unlink_pipe_1:
+	rpc_unlink(gss_auth->pipe[1]->dentry);
+	return err;
+}
+
+static void gss_pipes_dentries_destroy_net(struct rpc_clnt *clnt,
+					   struct rpc_auth *auth)
+{
+	struct net *net = clnt->cl_xprt->xprt_net;
+	struct super_block *sb;
+
+	sb = rpc_get_sb_net(net);
+	if (sb) {
+		if (clnt->cl_path.dentry)
+			gss_pipes_dentries_destroy(auth);
+		rpc_put_sb_net(net);
+	}
+}
+
+static int gss_pipes_dentries_create_net(struct rpc_clnt *clnt,
+					 struct rpc_auth *auth)
+{
+	struct net *net = clnt->cl_xprt->xprt_net;
+	struct super_block *sb;
+	int err = 0;
+
+	sb = rpc_get_sb_net(net);
+	if (sb) {
+		if (clnt->cl_path.dentry)
+			err = gss_pipes_dentries_create(auth);
+		rpc_put_sb_net(net);
+	}
+	return err;
+}
+
 /*
  * NOTE: we have the opportunity to use different
  * parameters based on the input flavor (which must be a pseudoflavor)
@@ -812,31 +879,16 @@ gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
 		err = PTR_ERR(gss_auth->pipe[0]);
 		goto err_destroy_pipe_1;
 	}
-
-	gss_auth->pipe[1]->dentry = rpc_mkpipe_dentry(clnt->cl_path.dentry,
-						      "gssd",
-						      clnt, gss_auth->pipe[1]);
-	if (IS_ERR(gss_auth->pipe[1]->dentry)) {
-		err = PTR_ERR(gss_auth->pipe[1]->dentry);
+	err = gss_pipes_dentries_create_net(clnt, auth);
+	if (err)
 		goto err_destroy_pipe_0;
-	}
-
-	gss_auth->pipe[0]->dentry = rpc_mkpipe_dentry(clnt->cl_path.dentry,
-						      gss_auth->mech->gm_name,
-						      clnt, gss_auth->pipe[0]);
-	if (IS_ERR(gss_auth->pipe[0]->dentry)) {
-		err = PTR_ERR(gss_auth->pipe[0]->dentry);
-		goto err_unlink_pipe_1;
-	}
 	err = rpcauth_init_credcache(auth);
 	if (err)
-		goto err_unlink_pipe_0;
+		goto err_unlink_pipes;
 
 	return auth;
-err_unlink_pipe_0:
-	rpc_unlink(gss_auth->pipe[0]->dentry);
-err_unlink_pipe_1:
-	rpc_unlink(gss_auth->pipe[1]->dentry);
+err_unlink_pipes:
+	gss_pipes_dentries_destroy_net(clnt, auth);
 err_destroy_pipe_0:
 	rpc_destroy_pipe_data(gss_auth->pipe[0]);
 err_destroy_pipe_1:
@@ -853,8 +905,7 @@ gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
 static void
 gss_free(struct gss_auth *gss_auth)
 {
-	rpc_unlink(gss_auth->pipe[0]->dentry);
-	rpc_unlink(gss_auth->pipe[1]->dentry);
+	gss_pipes_dentries_destroy_net(gss_auth->client, &gss_auth->rpc_auth);
 	rpc_destroy_pipe_data(gss_auth->pipe[0]);
 	rpc_destroy_pipe_data(gss_auth->pipe[1]);
 	gss_mech_put(gss_auth->mech);
-- 
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