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Merge branch 'for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mason...
[karo-tx-linux.git] / fs / dlm / netlink.c
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
21 static int prepare_data(u8 cmd, struct sk_buff **skbp, size_t size)
22 {
23         struct sk_buff *skb;
24         void *data;
25
26         skb = genlmsg_new(size, GFP_NOFS);
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);
55
56         genlmsg_end(skb, data);
57
58         return genlmsg_unicast(&init_net, skb, listener_nlportid);
59 }
60
61 static int user_cmd(struct sk_buff *skb, struct genl_info *info)
62 {
63         listener_nlportid = info->snd_portid;
64         printk("user_cmd nlpid %u\n", listener_nlportid);
65         return 0;
66 }
67
68 static const struct genl_ops dlm_nl_ops[] = {
69         {
70                 .cmd    = DLM_CMD_HELLO,
71                 .doit   = user_cmd,
72         },
73 };
74
75 static struct genl_family family __ro_after_init = {
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
83 int __init dlm_netlink_init(void)
84 {
85         return genl_register_family(&family);
86 }
87
88 void dlm_netlink_exit(void)
89 {
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;
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;
107         if (lkb->lkb_ua)
108                 data->xid = lkb->lkb_ua->xid;
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 {
118         struct sk_buff *uninitialized_var(send_skb);
119         struct dlm_lock_data *data;
120         size_t size;
121         int rv;
122
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