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Linux/fs/dlm/netlink.c

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  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 
141 

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