1/*
2 * Copyright (C) 2007 Red Hat, Inc.  All rights reserved.
3 *
4 * This copyrighted material is made available to anyone wishing to use,
5 * modify, copy, or redistribute it subject to the terms and conditions
6 * of the GNU General Public License v.2.
7 */
8
9#include <net/genetlink.h>
10#include <linux/dlm.h>
11#include <linux/dlm_netlink.h>
12#include <linux/gfp.h>
13
14#include "dlm_internal.h"
15
16static uint32_t dlm_nl_seqnum;
17static uint32_t listener_nlportid;
18
19static struct genl_family family = {
20	.id		= GENL_ID_GENERATE,
21	.name		= DLM_GENL_NAME,
22	.version	= DLM_GENL_VERSION,
23};
24
25static int prepare_data(u8 cmd, struct sk_buff **skbp, size_t size)
26{
27	struct sk_buff *skb;
28	void *data;
29
30	skb = genlmsg_new(size, GFP_NOFS);
31	if (!skb)
32		return -ENOMEM;
33
34	/* add the message headers */
35	data = genlmsg_put(skb, 0, dlm_nl_seqnum++, &family, 0, cmd);
36	if (!data) {
37		nlmsg_free(skb);
38		return -EINVAL;
39	}
40
41	*skbp = skb;
42	return 0;
43}
44
45static struct dlm_lock_data *mk_data(struct sk_buff *skb)
46{
47	struct nlattr *ret;
48
49	ret = nla_reserve(skb, DLM_TYPE_LOCK, sizeof(struct dlm_lock_data));
50	if (!ret)
51		return NULL;
52	return nla_data(ret);
53}
54
55static int send_data(struct sk_buff *skb)
56{
57	struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data);
58	void *data = genlmsg_data(genlhdr);
59
60	genlmsg_end(skb, data);
61
62	return genlmsg_unicast(&init_net, skb, listener_nlportid);
63}
64
65static int user_cmd(struct sk_buff *skb, struct genl_info *info)
66{
67	listener_nlportid = info->snd_portid;
68	printk("user_cmd nlpid %u\n", listener_nlportid);
69	return 0;
70}
71
72static struct genl_ops dlm_nl_ops[] = {
73	{
74		.cmd	= DLM_CMD_HELLO,
75		.doit	= user_cmd,
76	},
77};
78
79int __init dlm_netlink_init(void)
80{
81	return genl_register_family_with_ops(&family, dlm_nl_ops);
82}
83
84void dlm_netlink_exit(void)
85{
86	genl_unregister_family(&family);
87}
88
89static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb)
90{
91	struct dlm_rsb *r = lkb->lkb_resource;
92
93	memset(data, 0, sizeof(struct dlm_lock_data));
94
95	data->version = DLM_LOCK_DATA_VERSION;
96	data->nodeid = lkb->lkb_nodeid;
97	data->ownpid = lkb->lkb_ownpid;
98	data->id = lkb->lkb_id;
99	data->remid = lkb->lkb_remid;
100	data->status = lkb->lkb_status;
101	data->grmode = lkb->lkb_grmode;
102	data->rqmode = lkb->lkb_rqmode;
103	if (lkb->lkb_ua)
104		data->xid = lkb->lkb_ua->xid;
105	if (r) {
106		data->lockspace_id = r->res_ls->ls_global_id;
107		data->resource_namelen = r->res_length;
108		memcpy(data->resource_name, r->res_name, r->res_length);
109	}
110}
111
112void dlm_timeout_warn(struct dlm_lkb *lkb)
113{
114	struct sk_buff *uninitialized_var(send_skb);
115	struct dlm_lock_data *data;
116	size_t size;
117	int rv;
118
119	size = nla_total_size(sizeof(struct dlm_lock_data)) +
120	       nla_total_size(0); /* why this? */
121
122	rv = prepare_data(DLM_CMD_TIMEOUT, &send_skb, size);
123	if (rv < 0)
124		return;
125
126	data = mk_data(send_skb);
127	if (!data) {
128		nlmsg_free(send_skb);
129		return;
130	}
131
132	fill_data(data, lkb);
133
134	send_data(send_skb);
135}
136
137