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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> | |
5a0e3ad6 | 12 | #include <linux/gfp.h> |
3ae1acf9 DT |
13 | |
14 | #include "dlm_internal.h" | |
15 | ||
16 | static uint32_t dlm_nl_seqnum; | |
15e47304 | 17 | static uint32_t listener_nlportid; |
3ae1acf9 DT |
18 | |
19 | static struct genl_family family = { | |
3ae1acf9 DT |
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 | ||
573c24c4 | 29 | skb = genlmsg_new(size, GFP_NOFS); |
3ae1acf9 DT |
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); | |
3ae1acf9 | 58 | |
053c095a | 59 | genlmsg_end(skb, data); |
3ae1acf9 | 60 | |
15e47304 | 61 | return genlmsg_unicast(&init_net, skb, listener_nlportid); |
3ae1acf9 DT |
62 | } |
63 | ||
64 | static int user_cmd(struct sk_buff *skb, struct genl_info *info) | |
65 | { | |
15e47304 EB |
66 | listener_nlportid = info->snd_portid; |
67 | printk("user_cmd nlpid %u\n", listener_nlportid); | |
3ae1acf9 DT |
68 | return 0; |
69 | } | |
70 | ||
c53ed742 JB |
71 | static struct genl_ops dlm_nl_ops[] = { |
72 | { | |
73 | .cmd = DLM_CMD_HELLO, | |
74 | .doit = user_cmd, | |
75 | }, | |
3ae1acf9 DT |
76 | }; |
77 | ||
30727174 | 78 | int __init dlm_netlink_init(void) |
3ae1acf9 | 79 | { |
c53ed742 | 80 | return genl_register_family_with_ops(&family, dlm_nl_ops); |
3ae1acf9 DT |
81 | } |
82 | ||
88ad2319 | 83 | void dlm_netlink_exit(void) |
3ae1acf9 | 84 | { |
3ae1acf9 DT |
85 | genl_unregister_family(&family); |
86 | } | |
87 | ||
88 | static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb) | |
89 | { | |
90 | struct dlm_rsb *r = lkb->lkb_resource; | |
3ae1acf9 DT |
91 | |
92 | memset(data, 0, sizeof(struct dlm_lock_data)); | |
93 | ||
94 | data->version = DLM_LOCK_DATA_VERSION; | |
95 | data->nodeid = lkb->lkb_nodeid; | |
96 | data->ownpid = lkb->lkb_ownpid; | |
97 | data->id = lkb->lkb_id; | |
98 | data->remid = lkb->lkb_remid; | |
99 | data->status = lkb->lkb_status; | |
100 | data->grmode = lkb->lkb_grmode; | |
101 | data->rqmode = lkb->lkb_rqmode; | |
d292c0cc DT |
102 | if (lkb->lkb_ua) |
103 | data->xid = lkb->lkb_ua->xid; | |
3ae1acf9 DT |
104 | if (r) { |
105 | data->lockspace_id = r->res_ls->ls_global_id; | |
106 | data->resource_namelen = r->res_length; | |
107 | memcpy(data->resource_name, r->res_name, r->res_length); | |
108 | } | |
109 | } | |
110 | ||
111 | void dlm_timeout_warn(struct dlm_lkb *lkb) | |
112 | { | |
180b65df | 113 | struct sk_buff *uninitialized_var(send_skb); |
3ae1acf9 | 114 | struct dlm_lock_data *data; |
3ae1acf9 DT |
115 | size_t size; |
116 | int rv; | |
117 | ||
3ae1acf9 DT |
118 | size = nla_total_size(sizeof(struct dlm_lock_data)) + |
119 | nla_total_size(0); /* why this? */ | |
120 | ||
121 | rv = prepare_data(DLM_CMD_TIMEOUT, &send_skb, size); | |
122 | if (rv < 0) | |
123 | return; | |
124 | ||
125 | data = mk_data(send_skb); | |
126 | if (!data) { | |
127 | nlmsg_free(send_skb); | |
128 | return; | |
129 | } | |
130 | ||
131 | fill_data(data, lkb); | |
132 | ||
133 | send_data(send_skb); | |
134 | } | |
135 |