]>
Commit | Line | Data |
---|---|---|
3ae1acf9 DT |
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 | ||
13 | #include "dlm_internal.h" | |
14 | ||
15 | static uint32_t dlm_nl_seqnum; | |
16 | static uint32_t listener_nlpid; | |
17 | ||
18 | static struct genl_family family = { | |
19 | .id = GENL_ID_GENERATE, | |
20 | .name = DLM_GENL_NAME, | |
21 | .version = DLM_GENL_VERSION, | |
22 | }; | |
23 | ||
24 | static int prepare_data(u8 cmd, struct sk_buff **skbp, size_t size) | |
25 | { | |
26 | struct sk_buff *skb; | |
27 | void *data; | |
28 | ||
29 | skb = genlmsg_new(size, GFP_KERNEL); | |
30 | if (!skb) | |
31 | return -ENOMEM; | |
32 | ||
33 | /* add the message headers */ | |
34 | data = genlmsg_put(skb, 0, dlm_nl_seqnum++, &family, 0, cmd); | |
35 | if (!data) { | |
36 | nlmsg_free(skb); | |
37 | return -EINVAL; | |
38 | } | |
39 | ||
40 | *skbp = skb; | |
41 | return 0; | |
42 | } | |
43 | ||
44 | static struct dlm_lock_data *mk_data(struct sk_buff *skb) | |
45 | { | |
46 | struct nlattr *ret; | |
47 | ||
48 | ret = nla_reserve(skb, DLM_TYPE_LOCK, sizeof(struct dlm_lock_data)); | |
49 | if (!ret) | |
50 | return NULL; | |
51 | return nla_data(ret); | |
52 | } | |
53 | ||
54 | static int send_data(struct sk_buff *skb) | |
55 | { | |
56 | struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data); | |
57 | void *data = genlmsg_data(genlhdr); | |
58 | int rv; | |
59 | ||
60 | rv = genlmsg_end(skb, data); | |
61 | if (rv < 0) { | |
62 | nlmsg_free(skb); | |
63 | return rv; | |
64 | } | |
65 | ||
66 | return genlmsg_unicast(skb, listener_nlpid); | |
67 | } | |
68 | ||
69 | static int user_cmd(struct sk_buff *skb, struct genl_info *info) | |
70 | { | |
71 | listener_nlpid = info->snd_pid; | |
72 | printk("user_cmd nlpid %u\n", listener_nlpid); | |
73 | return 0; | |
74 | } | |
75 | ||
76 | static struct genl_ops dlm_nl_ops = { | |
77 | .cmd = DLM_CMD_HELLO, | |
78 | .doit = user_cmd, | |
79 | }; | |
80 | ||
81 | int dlm_netlink_init(void) | |
82 | { | |
83 | int rv; | |
84 | ||
85 | rv = genl_register_family(&family); | |
86 | if (rv) | |
87 | return rv; | |
88 | ||
89 | rv = genl_register_ops(&family, &dlm_nl_ops); | |
90 | if (rv < 0) | |
91 | goto err; | |
92 | return 0; | |
93 | err: | |
94 | genl_unregister_family(&family); | |
95 | return rv; | |
96 | } | |
97 | ||
98 | void dlm_netlink_exit(void) | |
99 | { | |
100 | genl_unregister_ops(&family, &dlm_nl_ops); | |
101 | genl_unregister_family(&family); | |
102 | } | |
103 | ||
104 | static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb) | |
105 | { | |
106 | struct dlm_rsb *r = lkb->lkb_resource; | |
107 | struct dlm_user_args *ua = (struct dlm_user_args *) lkb->lkb_astparam; | |
108 | ||
109 | memset(data, 0, sizeof(struct dlm_lock_data)); | |
110 | ||
111 | data->version = DLM_LOCK_DATA_VERSION; | |
112 | data->nodeid = lkb->lkb_nodeid; | |
113 | data->ownpid = lkb->lkb_ownpid; | |
114 | data->id = lkb->lkb_id; | |
115 | data->remid = lkb->lkb_remid; | |
116 | data->status = lkb->lkb_status; | |
117 | data->grmode = lkb->lkb_grmode; | |
118 | data->rqmode = lkb->lkb_rqmode; | |
119 | data->timestamp = lkb->lkb_timestamp; | |
120 | if (ua) | |
121 | data->xid = ua->xid; | |
122 | if (r) { | |
123 | data->lockspace_id = r->res_ls->ls_global_id; | |
124 | data->resource_namelen = r->res_length; | |
125 | memcpy(data->resource_name, r->res_name, r->res_length); | |
126 | } | |
127 | } | |
128 | ||
129 | void dlm_timeout_warn(struct dlm_lkb *lkb) | |
130 | { | |
131 | struct dlm_lock_data *data; | |
132 | struct sk_buff *send_skb; | |
133 | size_t size; | |
134 | int rv; | |
135 | ||
3ae1acf9 DT |
136 | size = nla_total_size(sizeof(struct dlm_lock_data)) + |
137 | nla_total_size(0); /* why this? */ | |
138 | ||
139 | rv = prepare_data(DLM_CMD_TIMEOUT, &send_skb, size); | |
140 | if (rv < 0) | |
141 | return; | |
142 | ||
143 | data = mk_data(send_skb); | |
144 | if (!data) { | |
145 | nlmsg_free(send_skb); | |
146 | return; | |
147 | } | |
148 | ||
149 | fill_data(data, lkb); | |
150 | ||
151 | send_data(send_skb); | |
152 | } | |
153 |