ceph: have get_authorizer methods return pointers

Have the get_authorizer auth_client method return a ceph_auth
pointer rather than an integer, pointer-encoding any returned
error value.  This is to pave the way for making use of the
returned value in an upcoming patch.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>

fs/ceph/mds_client.c

@@ -3395,15 +3395,20 @@ static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
 /*
  * authentication
  */
-static int get_authorizer(struct ceph_connection *con,
+
+/*
+ * Note: returned pointer is the address of a structure that's
+ * managed separately.  Caller must *not* attempt to free it.
+ */
+static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
 					void **buf, int *len, int *proto,
-			  void **reply_buf, int *reply_len, int force_new)
+					void **reply_buf, int *reply_len,
+					int force_new)
 {
 	struct ceph_mds_session *s = con->private;
 	struct ceph_mds_client *mdsc = s->s_mdsc;
 	struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
 	struct ceph_auth_handshake *auth = &s->s_auth;
-	int ret = 0;
 
 	if (force_new && auth->authorizer) {
 		if (ac->ops && ac->ops->destroy_authorizer)
@@ -3411,9 +3416,10 @@ static int get_authorizer(struct ceph_connection *con,
 		auth->authorizer = NULL;
 	}
 	if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
-		ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_MDS, auth);
+		int ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
+							auth);
 		if (ret)
-			return ret;
+			return ERR_PTR(ret);
 	}
 
 	*proto = ac->protocol;
@@ -3422,7 +3428,7 @@ static int get_authorizer(struct ceph_connection *con,
 	*reply_buf = auth->authorizer_reply_buf;
 	*reply_len = auth->authorizer_reply_buf_len;
 
-	return 0;
+	return auth;
 }
 
 

include/linux/ceph/messenger.h

@@ -25,9 +25,11 @@ struct ceph_connection_operations {
 	void (*dispatch) (struct ceph_connection *con, struct ceph_msg *m);
 
 	/* authorize an outgoing connection */
-	int (*get_authorizer) (struct ceph_connection *con,
+	struct ceph_auth_handshake *(*get_authorizer) (
+				struct ceph_connection *con,
 				void **buf, int *len, int *proto,
-			       void **reply_buf, int *reply_len, int force_new);
+				void **reply_buf, int *reply_len,
+				int force_new);
 	int (*verify_authorizer_reply) (struct ceph_connection *con, int len);
 	int (*invalidate_authorizer)(struct ceph_connection *con);
 

net/ceph/messenger.c

@@ -658,7 +658,7 @@ static int prepare_connect_authorizer(struct ceph_connection *con)
 	void *auth_buf;
 	int auth_len;
 	int auth_protocol;
-	int ret;
+	struct ceph_auth_handshake *auth;
 
 	if (!con->ops->get_authorizer) {
 		con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
@@ -674,13 +674,13 @@ static int prepare_connect_authorizer(struct ceph_connection *con)
 	auth_buf = NULL;
 	auth_len = 0;
 	auth_protocol = CEPH_AUTH_UNKNOWN;
-	ret = con->ops->get_authorizer(con, &auth_buf, &auth_len,
+	auth = con->ops->get_authorizer(con, &auth_buf, &auth_len,
 				&auth_protocol, &con->auth_reply_buf,
 				&con->auth_reply_buf_len, con->auth_retry);
 	mutex_lock(&con->mutex);
 
-	if (ret)
-		return ret;
+	if (IS_ERR(auth))
+		return PTR_ERR(auth);
 
 	if (test_bit(CLOSED, &con->state) || test_bit(OPENING, &con->state))
 		return -EAGAIN;

net/ceph/osd_client.c

@@ -2108,15 +2108,19 @@ static void put_osd_con(struct ceph_connection *con)
 /*
  * authentication
  */
-static int get_authorizer(struct ceph_connection *con,
+/*
+ * Note: returned pointer is the address of a structure that's
+ * managed separately.  Caller must *not* attempt to free it.
+ */
+static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
 					void **buf, int *len, int *proto,
-			  void **reply_buf, int *reply_len, int force_new)
+					void **reply_buf, int *reply_len,
+					int force_new)
 {
 	struct ceph_osd *o = con->private;
 	struct ceph_osd_client *osdc = o->o_osdc;
 	struct ceph_auth_client *ac = osdc->client->monc.auth;
 	struct ceph_auth_handshake *auth = &o->o_auth;
-	int ret = 0;
 
 	if (force_new && auth->authorizer) {
 		if (ac->ops && ac->ops->destroy_authorizer)
@@ -2124,9 +2128,10 @@ static int get_authorizer(struct ceph_connection *con,
 		auth->authorizer = NULL;
 	}
 	if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
-		ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_OSD, auth);
+		int ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
+							auth);
 		if (ret)
-			return ret;
+			return ERR_PTR(ret);
 	}
 
 	*proto = ac->protocol;
@@ -2135,7 +2140,7 @@ static int get_authorizer(struct ceph_connection *con,
 	*reply_buf = auth->authorizer_reply_buf;
 	*reply_len = auth->authorizer_reply_buf_len;
 
-	return 0;
+	return auth;
 }