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
16 static uint32_t dlm_nl_seqnum;
17 static uint32_t listener_nlportid;
18
19 static struct genl_family family = {
20 .id = GENL_ID_GENERATE,
21 .name = DLM_GENL_NAME,
22 .version = DLM_GENL_VERSION,
23 };
24
prepare_data(u8 cmd,struct sk_buff ** skbp,size_t size)25 static 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
mk_data(struct sk_buff * skb)45 static 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
send_data(struct sk_buff * skb)55 static 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
user_cmd(struct sk_buff * skb,struct genl_info * info)65 static 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
72 static struct genl_ops dlm_nl_ops[] = {
73 {
74 .cmd = DLM_CMD_HELLO,
75 .doit = user_cmd,
76 },
77 };
78
dlm_netlink_init(void)79 int __init dlm_netlink_init(void)
80 {
81 return genl_register_family_with_ops(&family, dlm_nl_ops);
82 }
83
dlm_netlink_exit(void)84 void dlm_netlink_exit(void)
85 {
86 genl_unregister_family(&family);
87 }
88
fill_data(struct dlm_lock_data * data,struct dlm_lkb * lkb)89 static 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
dlm_timeout_warn(struct dlm_lkb * lkb)112 void 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