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Commit | Line | Data |
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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 | 18 | |
489111e5 | 19 | static struct genl_family family; |
3ae1acf9 DT |
20 | |
21 | static int prepare_data(u8 cmd, struct sk_buff **skbp, size_t size) | |
22 | { | |
23 | struct sk_buff *skb; | |
24 | void *data; | |
25 | ||
573c24c4 | 26 | skb = genlmsg_new(size, GFP_NOFS); |
3ae1acf9 DT |
27 | if (!skb) |
28 | return -ENOMEM; | |
29 | ||
30 | /* add the message headers */ | |
31 | data = genlmsg_put(skb, 0, dlm_nl_seqnum++, &family, 0, cmd); | |
32 | if (!data) { | |
33 | nlmsg_free(skb); | |
34 | return -EINVAL; | |
35 | } | |
36 | ||
37 | *skbp = skb; | |
38 | return 0; | |
39 | } | |
40 | ||
41 | static struct dlm_lock_data *mk_data(struct sk_buff *skb) | |
42 | { | |
43 | struct nlattr *ret; | |
44 | ||
45 | ret = nla_reserve(skb, DLM_TYPE_LOCK, sizeof(struct dlm_lock_data)); | |
46 | if (!ret) | |
47 | return NULL; | |
48 | return nla_data(ret); | |
49 | } | |
50 | ||
51 | static int send_data(struct sk_buff *skb) | |
52 | { | |
53 | struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data); | |
54 | void *data = genlmsg_data(genlhdr); | |
3ae1acf9 | 55 | |
053c095a | 56 | genlmsg_end(skb, data); |
3ae1acf9 | 57 | |
15e47304 | 58 | return genlmsg_unicast(&init_net, skb, listener_nlportid); |
3ae1acf9 DT |
59 | } |
60 | ||
61 | static int user_cmd(struct sk_buff *skb, struct genl_info *info) | |
62 | { | |
15e47304 EB |
63 | listener_nlportid = info->snd_portid; |
64 | printk("user_cmd nlpid %u\n", listener_nlportid); | |
3ae1acf9 DT |
65 | return 0; |
66 | } | |
67 | ||
dbef1c05 | 68 | static const struct genl_ops dlm_nl_ops[] = { |
c53ed742 JB |
69 | { |
70 | .cmd = DLM_CMD_HELLO, | |
71 | .doit = user_cmd, | |
72 | }, | |
3ae1acf9 DT |
73 | }; |
74 | ||
56989f6d | 75 | static struct genl_family family __ro_after_init = { |
489111e5 JB |
76 | .name = DLM_GENL_NAME, |
77 | .version = DLM_GENL_VERSION, | |
78 | .ops = dlm_nl_ops, | |
79 | .n_ops = ARRAY_SIZE(dlm_nl_ops), | |
80 | .module = THIS_MODULE, | |
81 | }; | |
82 | ||
30727174 | 83 | int __init dlm_netlink_init(void) |
3ae1acf9 | 84 | { |
489111e5 | 85 | return genl_register_family(&family); |
3ae1acf9 DT |
86 | } |
87 | ||
88ad2319 | 88 | void dlm_netlink_exit(void) |
3ae1acf9 | 89 | { |
3ae1acf9 DT |
90 | genl_unregister_family(&family); |
91 | } | |
92 | ||
93 | static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb) | |
94 | { | |
95 | struct dlm_rsb *r = lkb->lkb_resource; | |
3ae1acf9 DT |
96 | |
97 | memset(data, 0, sizeof(struct dlm_lock_data)); | |
98 | ||
99 | data->version = DLM_LOCK_DATA_VERSION; | |
100 | data->nodeid = lkb->lkb_nodeid; | |
101 | data->ownpid = lkb->lkb_ownpid; | |
102 | data->id = lkb->lkb_id; | |
103 | data->remid = lkb->lkb_remid; | |
104 | data->status = lkb->lkb_status; | |
105 | data->grmode = lkb->lkb_grmode; | |
106 | data->rqmode = lkb->lkb_rqmode; | |
d292c0cc DT |
107 | if (lkb->lkb_ua) |
108 | data->xid = lkb->lkb_ua->xid; | |
3ae1acf9 DT |
109 | if (r) { |
110 | data->lockspace_id = r->res_ls->ls_global_id; | |
111 | data->resource_namelen = r->res_length; | |
112 | memcpy(data->resource_name, r->res_name, r->res_length); | |
113 | } | |
114 | } | |
115 | ||
116 | void dlm_timeout_warn(struct dlm_lkb *lkb) | |
117 | { | |
180b65df | 118 | struct sk_buff *uninitialized_var(send_skb); |
3ae1acf9 | 119 | struct dlm_lock_data *data; |
3ae1acf9 DT |
120 | size_t size; |
121 | int rv; | |
122 | ||
3ae1acf9 DT |
123 | size = nla_total_size(sizeof(struct dlm_lock_data)) + |
124 | nla_total_size(0); /* why this? */ | |
125 | ||
126 | rv = prepare_data(DLM_CMD_TIMEOUT, &send_skb, size); | |
127 | if (rv < 0) | |
128 | return; | |
129 | ||
130 | data = mk_data(send_skb); | |
131 | if (!data) { | |
132 | nlmsg_free(send_skb); | |
133 | return; | |
134 | } | |
135 | ||
136 | fill_data(data, lkb); | |
137 | ||
138 | send_data(send_skb); | |
139 | } | |
140 |