1 files changed, 894 insertions, 0 deletions

diff --git a/fs/dlm/config.c b/fs/dlm/config.c
new file mode 100644
index 000000000..42b53e2a4
--- /dev/null
+++ b/fs/dlm/config.c
@@ -0,0 +1,894 @@
+/******************************************************************************
+*******************************************************************************
+**
+**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
+**  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
+**
+**  This copyrighted material is made available to anyone wishing to use,
+**  modify, copy, or redistribute it subject to the terms and conditions
+**  of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/configfs.h>
+#include <linux/slab.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/dlmconstants.h>
+#include <net/ipv6.h>
+#include <net/sock.h>
+
+#include "config.h"
+#include "lowcomms.h"
+
+/*
+ * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
+ * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
+ * /config/dlm/<cluster>/comms/<comm>/nodeid
+ * /config/dlm/<cluster>/comms/<comm>/local
+ * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
+ * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
+ * The <cluster> level is useless, but I haven't figured out how to avoid it.
+ */
+
+static struct config_group *space_list;
+static struct config_group *comm_list;
+static struct dlm_comm *local_comm;
+static uint32_t dlm_comm_count;
+
+struct dlm_clusters;
+struct dlm_cluster;
+struct dlm_spaces;
+struct dlm_space;
+struct dlm_comms;
+struct dlm_comm;
+struct dlm_nodes;
+struct dlm_node;
+
+static struct config_group *make_cluster(struct config_group *, const char *);
+static void drop_cluster(struct config_group *, struct config_item *);
+static void release_cluster(struct config_item *);
+static struct config_group *make_space(struct config_group *, const char *);
+static void drop_space(struct config_group *, struct config_item *);
+static void release_space(struct config_item *);
+static struct config_item *make_comm(struct config_group *, const char *);
+static void drop_comm(struct config_group *, struct config_item *);
+static void release_comm(struct config_item *);
+static struct config_item *make_node(struct config_group *, const char *);
+static void drop_node(struct config_group *, struct config_item *);
+static void release_node(struct config_item *);
+
+static struct configfs_attribute *comm_attrs[];
+static struct configfs_attribute *node_attrs[];
+
+struct dlm_cluster {
+	struct config_group group;
+	unsigned int cl_tcp_port;
+	unsigned int cl_buffer_size;
+	unsigned int cl_rsbtbl_size;
+	unsigned int cl_recover_timer;
+	unsigned int cl_toss_secs;
+	unsigned int cl_scan_secs;
+	unsigned int cl_log_debug;
+	unsigned int cl_log_info;
+	unsigned int cl_protocol;
+	unsigned int cl_timewarn_cs;
+	unsigned int cl_waitwarn_us;
+	unsigned int cl_new_rsb_count;
+	unsigned int cl_recover_callbacks;
+	char cl_cluster_name[DLM_LOCKSPACE_LEN];
+
+	struct dlm_spaces *sps;
+	struct dlm_comms *cms;
+};
+
+static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
+{
+	return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
+		   NULL;
+}
+
+enum {
+	CLUSTER_ATTR_TCP_PORT = 0,
+	CLUSTER_ATTR_BUFFER_SIZE,
+	CLUSTER_ATTR_RSBTBL_SIZE,
+	CLUSTER_ATTR_RECOVER_TIMER,
+	CLUSTER_ATTR_TOSS_SECS,
+	CLUSTER_ATTR_SCAN_SECS,
+	CLUSTER_ATTR_LOG_DEBUG,
+	CLUSTER_ATTR_LOG_INFO,
+	CLUSTER_ATTR_PROTOCOL,
+	CLUSTER_ATTR_TIMEWARN_CS,
+	CLUSTER_ATTR_WAITWARN_US,
+	CLUSTER_ATTR_NEW_RSB_COUNT,
+	CLUSTER_ATTR_RECOVER_CALLBACKS,
+	CLUSTER_ATTR_CLUSTER_NAME,
+};
+
+static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
+{
+	struct dlm_cluster *cl = config_item_to_cluster(item);
+	return sprintf(buf, "%s\n", cl->cl_cluster_name);
+}
+
+static ssize_t cluster_cluster_name_store(struct config_item *item,
+					  const char *buf, size_t len)
+{
+	struct dlm_cluster *cl = config_item_to_cluster(item);
+
+	strlcpy(dlm_config.ci_cluster_name, buf,
+				sizeof(dlm_config.ci_cluster_name));
+	strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
+	return len;
+}
+
+CONFIGFS_ATTR(cluster_, cluster_name);
+
+static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
+			   int *info_field, int check_zero,
+			   const char *buf, size_t len)
+{
+	unsigned int x;
+	int rc;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+	rc = kstrtouint(buf, 0, &x);
+	if (rc)
+		return rc;
+
+	if (check_zero && !x)
+		return -EINVAL;
+
+	*cl_field = x;
+	*info_field = x;
+
+	return len;
+}
+
+#define CLUSTER_ATTR(name, check_zero)                                        \
+static ssize_t cluster_##name##_store(struct config_item *item, \
+		const char *buf, size_t len) \
+{                                                                             \
+	struct dlm_cluster *cl = config_item_to_cluster(item);		      \
+	return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
+			   check_zero, buf, len);                             \
+}                                                                             \
+static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
+{                                                                             \
+	struct dlm_cluster *cl = config_item_to_cluster(item);		      \
+	return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
+}                                                                             \
+CONFIGFS_ATTR(cluster_, name);
+
+CLUSTER_ATTR(tcp_port, 1);
+CLUSTER_ATTR(buffer_size, 1);
+CLUSTER_ATTR(rsbtbl_size, 1);
+CLUSTER_ATTR(recover_timer, 1);
+CLUSTER_ATTR(toss_secs, 1);
+CLUSTER_ATTR(scan_secs, 1);
+CLUSTER_ATTR(log_debug, 0);
+CLUSTER_ATTR(log_info, 0);
+CLUSTER_ATTR(protocol, 0);
+CLUSTER_ATTR(timewarn_cs, 1);
+CLUSTER_ATTR(waitwarn_us, 0);
+CLUSTER_ATTR(new_rsb_count, 0);
+CLUSTER_ATTR(recover_callbacks, 0);
+
+static struct configfs_attribute *cluster_attrs[] = {
+	[CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
+	[CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
+	[CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
+	[CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
+	[CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
+	[CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
+	[CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
+	[CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
+	[CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
+	[CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
+	[CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
+	[CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
+	[CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
+	[CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
+	NULL,
+};
+
+enum {
+	COMM_ATTR_NODEID = 0,
+	COMM_ATTR_LOCAL,
+	COMM_ATTR_ADDR,
+	COMM_ATTR_ADDR_LIST,
+};
+
+enum {
+	NODE_ATTR_NODEID = 0,
+	NODE_ATTR_WEIGHT,
+};
+
+struct dlm_clusters {
+	struct configfs_subsystem subsys;
+};
+
+struct dlm_spaces {
+	struct config_group ss_group;
+};
+
+struct dlm_space {
+	struct config_group group;
+	struct list_head members;
+	struct mutex members_lock;
+	int members_count;
+	struct dlm_nodes *nds;
+};
+
+struct dlm_comms {
+	struct config_group cs_group;
+};
+
+struct dlm_comm {
+	struct config_item item;
+	int seq;
+	int nodeid;
+	int local;
+	int addr_count;
+	struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
+};
+
+struct dlm_nodes {
+	struct config_group ns_group;
+};
+
+struct dlm_node {
+	struct config_item item;
+	struct list_head list; /* space->members */
+	int nodeid;
+	int weight;
+	int new;
+	int comm_seq; /* copy of cm->seq when nd->nodeid is set */
+};
+
+static struct configfs_group_operations clusters_ops = {
+	.make_group = make_cluster,
+	.drop_item = drop_cluster,
+};
+
+static struct configfs_item_operations cluster_ops = {
+	.release = release_cluster,
+};
+
+static struct configfs_group_operations spaces_ops = {
+	.make_group = make_space,
+	.drop_item = drop_space,
+};
+
+static struct configfs_item_operations space_ops = {
+	.release = release_space,
+};
+
+static struct configfs_group_operations comms_ops = {
+	.make_item = make_comm,
+	.drop_item = drop_comm,
+};
+
+static struct configfs_item_operations comm_ops = {
+	.release = release_comm,
+};
+
+static struct configfs_group_operations nodes_ops = {
+	.make_item = make_node,
+	.drop_item = drop_node,
+};
+
+static struct configfs_item_operations node_ops = {
+	.release = release_node,
+};
+
+static const struct config_item_type clusters_type = {
+	.ct_group_ops = &clusters_ops,
+	.ct_owner = THIS_MODULE,
+};
+
+static const struct config_item_type cluster_type = {
+	.ct_item_ops = &cluster_ops,
+	.ct_attrs = cluster_attrs,
+	.ct_owner = THIS_MODULE,
+};
+
+static const struct config_item_type spaces_type = {
+	.ct_group_ops = &spaces_ops,
+	.ct_owner = THIS_MODULE,
+};
+
+static const struct config_item_type space_type = {
+	.ct_item_ops = &space_ops,
+	.ct_owner = THIS_MODULE,
+};
+
+static const struct config_item_type comms_type = {
+	.ct_group_ops = &comms_ops,
+	.ct_owner = THIS_MODULE,
+};
+
+static const struct config_item_type comm_type = {
+	.ct_item_ops = &comm_ops,
+	.ct_attrs = comm_attrs,
+	.ct_owner = THIS_MODULE,
+};
+
+static const struct config_item_type nodes_type = {
+	.ct_group_ops = &nodes_ops,
+	.ct_owner = THIS_MODULE,
+};
+
+static const struct config_item_type node_type = {
+	.ct_item_ops = &node_ops,
+	.ct_attrs = node_attrs,
+	.ct_owner = THIS_MODULE,
+};
+
+static struct dlm_space *config_item_to_space(struct config_item *i)
+{
+	return i ? container_of(to_config_group(i), struct dlm_space, group) :
+		   NULL;
+}
+
+static struct dlm_comm *config_item_to_comm(struct config_item *i)
+{
+	return i ? container_of(i, struct dlm_comm, item) : NULL;
+}
+
+static struct dlm_node *config_item_to_node(struct config_item *i)
+{
+	return i ? container_of(i, struct dlm_node, item) : NULL;
+}
+
+static struct config_group *make_cluster(struct config_group *g,
+					 const char *name)
+{
+	struct dlm_cluster *cl = NULL;
+	struct dlm_spaces *sps = NULL;
+	struct dlm_comms *cms = NULL;
+
+	cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
+	sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
+	cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
+
+	if (!cl || !sps || !cms)
+		goto fail;
+
+	cl->sps = sps;
+	cl->cms = cms;
+
+	config_group_init_type_name(&cl->group, name, &cluster_type);
+	config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
+	config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
+
+	configfs_add_default_group(&sps->ss_group, &cl->group);
+	configfs_add_default_group(&cms->cs_group, &cl->group);
+
+	cl->cl_tcp_port = dlm_config.ci_tcp_port;
+	cl->cl_buffer_size = dlm_config.ci_buffer_size;
+	cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
+	cl->cl_recover_timer = dlm_config.ci_recover_timer;
+	cl->cl_toss_secs = dlm_config.ci_toss_secs;
+	cl->cl_scan_secs = dlm_config.ci_scan_secs;
+	cl->cl_log_debug = dlm_config.ci_log_debug;
+	cl->cl_log_info = dlm_config.ci_log_info;
+	cl->cl_protocol = dlm_config.ci_protocol;
+	cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
+	cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
+	cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
+	cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
+	memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
+	       DLM_LOCKSPACE_LEN);
+
+	space_list = &sps->ss_group;
+	comm_list = &cms->cs_group;
+	return &cl->group;
+
+ fail:
+	kfree(cl);
+	kfree(sps);
+	kfree(cms);
+	return ERR_PTR(-ENOMEM);
+}
+
+static void drop_cluster(struct config_group *g, struct config_item *i)
+{
+	struct dlm_cluster *cl = config_item_to_cluster(i);
+
+	configfs_remove_default_groups(&cl->group);
+
+	space_list = NULL;
+	comm_list = NULL;
+
+	config_item_put(i);
+}
+
+static void release_cluster(struct config_item *i)
+{
+	struct dlm_cluster *cl = config_item_to_cluster(i);
+
+	kfree(cl->sps);
+	kfree(cl->cms);
+	kfree(cl);
+}
+
+static struct config_group *make_space(struct config_group *g, const char *name)
+{
+	struct dlm_space *sp = NULL;
+	struct dlm_nodes *nds = NULL;
+
+	sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
+	nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
+
+	if (!sp || !nds)
+		goto fail;
+
+	config_group_init_type_name(&sp->group, name, &space_type);
+
+	config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
+	configfs_add_default_group(&nds->ns_group, &sp->group);
+
+	INIT_LIST_HEAD(&sp->members);
+	mutex_init(&sp->members_lock);
+	sp->members_count = 0;
+	sp->nds = nds;
+	return &sp->group;
+
+ fail:
+	kfree(sp);
+	kfree(nds);
+	return ERR_PTR(-ENOMEM);
+}
+
+static void drop_space(struct config_group *g, struct config_item *i)
+{
+	struct dlm_space *sp = config_item_to_space(i);
+
+	/* assert list_empty(&sp->members) */
+
+	configfs_remove_default_groups(&sp->group);
+	config_item_put(i);
+}
+
+static void release_space(struct config_item *i)
+{
+	struct dlm_space *sp = config_item_to_space(i);
+	kfree(sp->nds);
+	kfree(sp);
+}
+
+static struct config_item *make_comm(struct config_group *g, const char *name)
+{
+	struct dlm_comm *cm;
+
+	cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
+	if (!cm)
+		return ERR_PTR(-ENOMEM);
+
+	config_item_init_type_name(&cm->item, name, &comm_type);
+
+	cm->seq = dlm_comm_count++;
+	if (!cm->seq)
+		cm->seq = dlm_comm_count++;
+
+	cm->nodeid = -1;
+	cm->local = 0;
+	cm->addr_count = 0;
+	return &cm->item;
+}
+
+static void drop_comm(struct config_group *g, struct config_item *i)
+{
+	struct dlm_comm *cm = config_item_to_comm(i);
+	if (local_comm == cm)
+		local_comm = NULL;
+	dlm_lowcomms_close(cm->nodeid);
+	while (cm->addr_count--)
+		kfree(cm->addr[cm->addr_count]);
+	config_item_put(i);
+}
+
+static void release_comm(struct config_item *i)
+{
+	struct dlm_comm *cm = config_item_to_comm(i);
+	kfree(cm);
+}
+
+static struct config_item *make_node(struct config_group *g, const char *name)
+{
+	struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
+	struct dlm_node *nd;
+
+	nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
+	if (!nd)
+		return ERR_PTR(-ENOMEM);
+
+	config_item_init_type_name(&nd->item, name, &node_type);
+	nd->nodeid = -1;
+	nd->weight = 1;  /* default weight of 1 if none is set */
+	nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
+
+	mutex_lock(&sp->members_lock);
+	list_add(&nd->list, &sp->members);
+	sp->members_count++;
+	mutex_unlock(&sp->members_lock);
+
+	return &nd->item;
+}
+
+static void drop_node(struct config_group *g, struct config_item *i)
+{
+	struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
+	struct dlm_node *nd = config_item_to_node(i);
+
+	mutex_lock(&sp->members_lock);
+	list_del(&nd->list);
+	sp->members_count--;
+	mutex_unlock(&sp->members_lock);
+
+	config_item_put(i);
+}
+
+static void release_node(struct config_item *i)
+{
+	struct dlm_node *nd = config_item_to_node(i);
+	kfree(nd);
+}
+
+static struct dlm_clusters clusters_root = {
+	.subsys = {
+		.su_group = {
+			.cg_item = {
+				.ci_namebuf = "dlm",
+				.ci_type = &clusters_type,
+			},
+		},
+	},
+};
+
+int __init dlm_config_init(void)
+{
+	config_group_init(&clusters_root.subsys.su_group);
+	mutex_init(&clusters_root.subsys.su_mutex);
+	return configfs_register_subsystem(&clusters_root.subsys);
+}
+
+void dlm_config_exit(void)
+{
+	configfs_unregister_subsystem(&clusters_root.subsys);
+}
+
+/*
+ * Functions for user space to read/write attributes
+ */
+
+static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
+{
+	return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
+}
+
+static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
+				 size_t len)
+{
+	int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
+
+	if (rc)
+		return rc;
+	return len;
+}
+
+static ssize_t comm_local_show(struct config_item *item, char *buf)
+{
+	return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
+}
+
+static ssize_t comm_local_store(struct config_item *item, const char *buf,
+				size_t len)
+{
+	struct dlm_comm *cm = config_item_to_comm(item);
+	int rc = kstrtoint(buf, 0, &cm->local);
+
+	if (rc)
+		return rc;
+	if (cm->local && !local_comm)
+		local_comm = cm;
+	return len;
+}
+
+static ssize_t comm_addr_store(struct config_item *item, const char *buf,
+		size_t len)
+{
+	struct dlm_comm *cm = config_item_to_comm(item);
+	struct sockaddr_storage *addr;
+	int rv;
+
+	if (len != sizeof(struct sockaddr_storage))
+		return -EINVAL;
+
+	if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
+		return -ENOSPC;
+
+	addr = kzalloc(sizeof(*addr), GFP_NOFS);
+	if (!addr)
+		return -ENOMEM;
+
+	memcpy(addr, buf, len);
+
+	rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
+	if (rv) {
+		kfree(addr);
+		return rv;
+	}
+
+	cm->addr[cm->addr_count++] = addr;
+	return len;
+}
+
+static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
+{
+	struct dlm_comm *cm = config_item_to_comm(item);
+	ssize_t s;
+	ssize_t allowance;
+	int i;
+	struct sockaddr_storage *addr;
+	struct sockaddr_in *addr_in;
+	struct sockaddr_in6 *addr_in6;
+	
+	/* Taken from ip6_addr_string() defined in lib/vsprintf.c */
+	char buf0[sizeof("AF_INET6	xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
+	
+
+	/* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
+	allowance = 4096;
+	buf[0] = '\0';
+
+	for (i = 0; i < cm->addr_count; i++) {
+		addr = cm->addr[i];
+
+		switch(addr->ss_family) {
+		case AF_INET:
+			addr_in = (struct sockaddr_in *)addr;
+			s = sprintf(buf0, "AF_INET	%pI4\n", &addr_in->sin_addr.s_addr);
+			break;
+		case AF_INET6:
+			addr_in6 = (struct sockaddr_in6 *)addr;
+			s = sprintf(buf0, "AF_INET6	%pI6\n", &addr_in6->sin6_addr);
+			break;
+		default:
+			s = sprintf(buf0, "%s\n", "<UNKNOWN>");
+			break;
+		}
+		allowance -= s;
+		if (allowance >= 0)
+			strcat(buf, buf0);
+		else {
+			allowance += s;
+			break;
+		}
+	}
+	return 4096 - allowance;
+}
+
+CONFIGFS_ATTR(comm_, nodeid);
+CONFIGFS_ATTR(comm_, local);
+CONFIGFS_ATTR_WO(comm_, addr);
+CONFIGFS_ATTR_RO(comm_, addr_list);
+
+static struct configfs_attribute *comm_attrs[] = {
+	[COMM_ATTR_NODEID] = &comm_attr_nodeid,
+	[COMM_ATTR_LOCAL] = &comm_attr_local,
+	[COMM_ATTR_ADDR] = &comm_attr_addr,
+	[COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
+	NULL,
+};
+
+static ssize_t node_nodeid_show(struct config_item *item, char *buf)
+{
+	return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
+}
+
+static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
+				 size_t len)
+{
+	struct dlm_node *nd = config_item_to_node(item);
+	uint32_t seq = 0;
+	int rc = kstrtoint(buf, 0, &nd->nodeid);
+
+	if (rc)
+		return rc;
+	dlm_comm_seq(nd->nodeid, &seq);
+	nd->comm_seq = seq;
+	return len;
+}
+
+static ssize_t node_weight_show(struct config_item *item, char *buf)
+{
+	return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
+}
+
+static ssize_t node_weight_store(struct config_item *item, const char *buf,
+				 size_t len)
+{
+	int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
+
+	if (rc)
+		return rc;
+	return len;
+}
+
+CONFIGFS_ATTR(node_, nodeid);
+CONFIGFS_ATTR(node_, weight);
+
+static struct configfs_attribute *node_attrs[] = {
+	[NODE_ATTR_NODEID] = &node_attr_nodeid,
+	[NODE_ATTR_WEIGHT] = &node_attr_weight,
+	NULL,
+};
+
+/*
+ * Functions for the dlm to get the info that's been configured
+ */
+
+static struct dlm_space *get_space(char *name)
+{
+	struct config_item *i;
+
+	if (!space_list)
+		return NULL;
+
+	mutex_lock(&space_list->cg_subsys->su_mutex);
+	i = config_group_find_item(space_list, name);
+	mutex_unlock(&space_list->cg_subsys->su_mutex);
+
+	return config_item_to_space(i);
+}
+
+static void put_space(struct dlm_space *sp)
+{
+	config_item_put(&sp->group.cg_item);
+}
+
+static struct dlm_comm *get_comm(int nodeid)
+{
+	struct config_item *i;
+	struct dlm_comm *cm = NULL;
+	int found = 0;
+
+	if (!comm_list)
+		return NULL;
+
+	mutex_lock(&clusters_root.subsys.su_mutex);
+
+	list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
+		cm = config_item_to_comm(i);
+
+		if (cm->nodeid != nodeid)
+			continue;
+		found = 1;
+		config_item_get(i);
+		break;
+	}
+	mutex_unlock(&clusters_root.subsys.su_mutex);
+
+	if (!found)
+		cm = NULL;
+	return cm;
+}
+
+static void put_comm(struct dlm_comm *cm)
+{
+	config_item_put(&cm->item);
+}
+
+/* caller must free mem */
+int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
+		     int *count_out)
+{
+	struct dlm_space *sp;
+	struct dlm_node *nd;
+	struct dlm_config_node *nodes, *node;
+	int rv, count;
+
+	sp = get_space(lsname);
+	if (!sp)
+		return -EEXIST;
+
+	mutex_lock(&sp->members_lock);
+	if (!sp->members_count) {
+		rv = -EINVAL;
+		printk(KERN_ERR "dlm: zero members_count\n");
+		goto out;
+	}
+
+	count = sp->members_count;
+
+	nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
+	if (!nodes) {
+		rv = -ENOMEM;
+		goto out;
+	}
+
+	node = nodes;
+	list_for_each_entry(nd, &sp->members, list) {
+		node->nodeid = nd->nodeid;
+		node->weight = nd->weight;
+		node->new = nd->new;
+		node->comm_seq = nd->comm_seq;
+		node++;
+
+		nd->new = 0;
+	}
+
+	*count_out = count;
+	*nodes_out = nodes;
+	rv = 0;
+ out:
+	mutex_unlock(&sp->members_lock);
+	put_space(sp);
+	return rv;
+}
+
+int dlm_comm_seq(int nodeid, uint32_t *seq)
+{
+	struct dlm_comm *cm = get_comm(nodeid);
+	if (!cm)
+		return -EEXIST;
+	*seq = cm->seq;
+	put_comm(cm);
+	return 0;
+}
+
+int dlm_our_nodeid(void)
+{
+	return local_comm ? local_comm->nodeid : 0;
+}
+
+/* num 0 is first addr, num 1 is second addr */
+int dlm_our_addr(struct sockaddr_storage *addr, int num)
+{
+	if (!local_comm)
+		return -1;
+	if (num + 1 > local_comm->addr_count)
+		return -1;
+	memcpy(addr, local_comm->addr[num], sizeof(*addr));
+	return 0;
+}
+
+/* Config file defaults */
+#define DEFAULT_TCP_PORT       21064
+#define DEFAULT_BUFFER_SIZE     4096
+#define DEFAULT_RSBTBL_SIZE     1024
+#define DEFAULT_RECOVER_TIMER      5
+#define DEFAULT_TOSS_SECS         10
+#define DEFAULT_SCAN_SECS          5
+#define DEFAULT_LOG_DEBUG          0
+#define DEFAULT_LOG_INFO           1
+#define DEFAULT_PROTOCOL           0
+#define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
+#define DEFAULT_WAITWARN_US	   0
+#define DEFAULT_NEW_RSB_COUNT    128
+#define DEFAULT_RECOVER_CALLBACKS  0
+#define DEFAULT_CLUSTER_NAME      ""
+
+struct dlm_config_info dlm_config = {
+	.ci_tcp_port = DEFAULT_TCP_PORT,
+	.ci_buffer_size = DEFAULT_BUFFER_SIZE,
+	.ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
+	.ci_recover_timer = DEFAULT_RECOVER_TIMER,
+	.ci_toss_secs = DEFAULT_TOSS_SECS,
+	.ci_scan_secs = DEFAULT_SCAN_SECS,
+	.ci_log_debug = DEFAULT_LOG_DEBUG,
+	.ci_log_info = DEFAULT_LOG_INFO,
+	.ci_protocol = DEFAULT_PROTOCOL,
+	.ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
+	.ci_waitwarn_us = DEFAULT_WAITWARN_US,
+	.ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
+	.ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
+	.ci_cluster_name = DEFAULT_CLUSTER_NAME
+};
+