path: root/fs/dlm/config.c

// SPDX-License-Identifier: GPL-2.0-only
/******************************************************************************
*******************************************************************************
**
**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
**  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
**
**
*******************************************************************************
******************************************************************************/

#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 "midcomms.h"
#include "lowcomms.h"

/*
 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid (refers to <node>)
 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/release_recover
 * /config/dlm/<cluster>/comms/<comm>/nodeid (refers to <comm>)
 * /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[];

const struct rhashtable_params dlm_rhash_rsb_params = {
	.nelem_hint = 3, /* start small */
	.key_len = DLM_RESNAME_MAXLEN,
	.key_offset = offsetof(struct dlm_rsb, res_name),
	.head_offset = offsetof(struct dlm_rsb, res_node),
	.automatic_shrinking = true,
};

struct dlm_cluster {
	struct config_group group;
	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_MARK,
	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)
{
	return sprintf(buf, "%s\n", dlm_config.ci_cluster_name);
}

static ssize_t cluster_cluster_name_store(struct config_item *item,
					  const char *buf, size_t len)
{
	strscpy(dlm_config.ci_cluster_name, buf,
		sizeof(dlm_config.ci_cluster_name));
	return len;
}

CONFIGFS_ATTR(cluster_, cluster_name);

static ssize_t cluster_tcp_port_show(struct config_item *item, char *buf)
{
	return sprintf(buf, "%u\n", be16_to_cpu(dlm_config.ci_tcp_port));
}

static int dlm_check_zero_and_dlm_running(unsigned int x)
{
	if (!x)
		return -EINVAL;

	if (dlm_lowcom