lockd: Store the lockd client credential in struct nlm_host

When we create a new lockd client, we want to be able to pass the
correct credential of the process that created the struct nlm_host.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

fs/lockd/clntlock.c

@@ -63,7 +63,7 @@ struct nlm_host *nlmclnt_init(const struct nlmclnt_initdata *nlm_init)
 	host = nlmclnt_lookup_host(nlm_init->address, nlm_init->addrlen,
 				   nlm_init->protocol, nlm_version,
 				   nlm_init->hostname, nlm_init->noresvport,
-				   nlm_init->net);
+				   nlm_init->net, nlm_init->cred);
 	if (host == NULL)
 		goto out_nohost;
 	if (host->h_rpcclnt == NULL && nlm_bind_host(host) == NULL)

fs/lockd/host.c

@@ -60,6 +60,7 @@ struct nlm_lookup_host_info {
 	const size_t		hostname_len;	/* it's length */
 	const int		noresvport;	/* use non-priv port */
 	struct net		*net;		/* network namespace to bind */
+	const struct cred	*cred;
 };
 
 /*
@@ -162,6 +163,7 @@ static struct nlm_host *nlm_alloc_host(struct nlm_lookup_host_info *ni,
 	host->h_nsmhandle  = nsm;
 	host->h_addrbuf    = nsm->sm_addrbuf;
 	host->net	   = ni->net;
+	host->h_cred	   = get_cred(ni->cred),
 	strlcpy(host->nodename, utsname()->nodename, sizeof(host->nodename));
 
 out:
@@ -188,6 +190,7 @@ static void nlm_destroy_host_locked(struct nlm_host *host)
 	clnt = host->h_rpcclnt;
 	if (clnt != NULL)
 		rpc_shutdown_client(clnt);
+	put_cred(host->h_cred);
 	kfree(host);
 
 	ln->nrhosts--;
@@ -202,6 +205,8 @@ static void nlm_destroy_host_locked(struct nlm_host *host)
  * @version: NLM protocol version
  * @hostname: '\0'-terminated hostname of server
  * @noresvport: 1 if non-privileged port should be used
+ * @net: pointer to net namespace
+ * @cred: pointer to cred
  *
  * Returns an nlm_host structure that matches the passed-in
  * [server address, transport protocol, NLM version, server hostname].
@@ -214,7 +219,8 @@ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
 				     const u32 version,
 				     const char *hostname,
 				     int noresvport,
-				     struct net *net)
+				     struct net *net,
+				     const struct cred *cred)
 {
 	struct nlm_lookup_host_info ni = {
 		.server		= 0,
@@ -226,6 +232,7 @@ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
 		.hostname_len	= strlen(hostname),
 		.noresvport	= noresvport,
 		.net		= net,
+		.cred		= cred,
 	};
 	struct hlist_head *chain;
 	struct nlm_host	*host;
@@ -458,7 +465,7 @@ nlm_bind_host(struct nlm_host *host)
 			.authflavor	= RPC_AUTH_UNIX,
 			.flags		= (RPC_CLNT_CREATE_NOPING |
 					   RPC_CLNT_CREATE_AUTOBIND),
-			.cred		= current_cred(),
+			.cred		= host->h_cred,
 		};
 
 		/*

include/linux/lockd/bind.h

@@ -46,6 +46,7 @@ struct nlmclnt_initdata {
 	int			noresvport;
 	struct net		*net;
 	const struct nlmclnt_operations	*nlmclnt_ops;
+	const struct cred	*cred;
 };
 
 /*

include/linux/lockd/lockd.h

@@ -70,6 +70,7 @@ struct nlm_host {
 	struct nsm_handle	*h_nsmhandle;	/* NSM status handle */
 	char			*h_addrbuf;	/* address eyecatcher */
 	struct net		*net;		/* host net */
+	const struct cred	*h_cred;
 	char			nodename[UNX_MAXNODENAME + 1];
 	const struct nlmclnt_operations	*h_nlmclnt_ops;	/* Callback ops for NLM users */
 };
@@ -229,7 +230,8 @@ struct nlm_host  *nlmclnt_lookup_host(const struct sockaddr *sap,
 					const u32 version,
 					const char *hostname,
 					int noresvport,
-					struct net *net);
+					struct net *net,
+					const struct cred *cred);
 void		  nlmclnt_release_host(struct nlm_host *);
 struct nlm_host  *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
 					const char *hostname,