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_nlpid;
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 int rv;
60
61 rv = genlmsg_end(skb, data);
62 if (rv < 0) {
63 nlmsg_free(skb);
64 return rv;
65 }
66
67 return genlmsg_unicast(&init_net, skb, listener_nlpid);
68 }
69
user_cmd(struct sk_buff * skb,struct genl_info * info)70 static int user_cmd(struct sk_buff *skb, struct genl_info *info)
71 {
72 listener_nlpid = info->snd_pid;
73 printk("user_cmd nlpid %u\n", listener_nlpid);
74 return 0;
75 }
76
77 static struct genl_ops dlm_nl_ops = {
78 .cmd = DLM_CMD_HELLO,
79 .doit = user_cmd,
80 };
81
dlm_netlink_init(void)82 int __init dlm_netlink_init(void)
83 {
84 return genl_register_family_with_ops(&family, &dlm_nl_ops, 1);
85 }
86
dlm_netlink_exit(void)87 void dlm_netlink_exit(void)
88 {
89 genl_unregister_family(&family);
90 }
91
fill_data(struct dlm_lock_data * data,struct dlm_lkb * lkb)92 static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb)
93 {
94 struct dlm_rsb *r = lkb->lkb_resource;
95
96 memset(data, 0, sizeof(struct dlm_lock_data));
97
98 data->version = DLM_LOCK_DATA_VERSION;
99 data->nodeid = lkb->lkb_nodeid;
100 data->ownpid = lkb->lkb_ownpid;
101 data->id = lkb->lkb_id;
102 data->remid = lkb->lkb_remid;
103 data->status = lkb->lkb_status;
104 data->grmode = lkb->lkb_grmode;
105 data->rqmode = lkb->lkb_rqmode;
106 if (lkb->lkb_ua)
107 data->xid = lkb->lkb_ua->xid;
108 if (r) {
109 data->lockspace_id = r->res_ls->ls_global_id;
110 data->resource_namelen = r->res_length;
111 memcpy(data->resource_name, r->res_name, r->res_length);
112 }
113 }
114
dlm_timeout_warn(struct dlm_lkb * lkb)115 void dlm_timeout_warn(struct dlm_lkb *lkb)
116 {
117 struct sk_buff *uninitialized_var(send_skb);
118 struct dlm_lock_data *data;
119 size_t size;
120 int rv;
121
122 size = nla_total_size(sizeof(struct dlm_lock_data)) +
123 nla_total_size(0); /* why this? */
124
125 rv = prepare_data(DLM_CMD_TIMEOUT, &send_skb, size);
126 if (rv < 0)
127 return;
128
129 data = mk_data(send_skb);
130 if (!data) {
131 nlmsg_free(send_skb);
132 return;
133 }
134
135 fill_data(data, lkb);
136
137 send_data(send_skb);
138 }
139
140