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 16static uint32_t dlm_nl_seqnum; 17static uint32_t listener_nlpid; 18 19static struct genl_family family = { 20 .id = GENL_ID_GENERATE, 21 .name = DLM_GENL_NAME, 22 .version = DLM_GENL_VERSION, 23}; 24 25static int prepare_data(u8 cmd, struct sk_buff **skbp, size_t size) 26{ 27 struct sk_buff *skb; 28 void *data; 29 30 skb = genlmsg_new(size, GFP_NOFS); 31 if (!skb) 32 return -ENOMEM; 33 34 /* add the message headers */ 35 data = genlmsg_put(skb, 0, dlm_nl_seqnum++, &family, 0, cmd); 36 if (!data) { 37 nlmsg_free(skb); 38 return -EINVAL; 39 } 40 41 *skbp = skb; 42 return 0; 43} 44 45static struct dlm_lock_data *mk_data(struct sk_buff *skb) 46{ 47 struct nlattr *ret; 48 49 ret = nla_reserve(skb, DLM_TYPE_LOCK, sizeof(struct dlm_lock_data)); 50 if (!ret) 51 return NULL; 52 return nla_data(ret); 53} 54 55static int send_data(struct sk_buff *skb) 56{ 57 struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data); 58 void *data = genlmsg_data(genlhdr); 59 int rv; 60 61 rv = genlmsg_end(skb, data); 62 if (rv < 0) { 63 nlmsg_free(skb); 64 return rv; 65 } 66 67 return genlmsg_unicast(&init_net, skb, listener_nlpid); 68} 69 70static int user_cmd(struct sk_buff *skb, struct genl_info *info) 71{ 72 listener_nlpid = info->snd_pid; 73 printk("user_cmd nlpid %u\n", listener_nlpid); 74 return 0; 75} 76 77static struct genl_ops dlm_nl_ops = { 78 .cmd = DLM_CMD_HELLO, 79 .doit = user_cmd, 80}; 81 82int __init dlm_netlink_init(void) 83{ 84 return genl_register_family_with_ops(&family, &dlm_nl_ops, 1); 85} 86 87void dlm_netlink_exit(void) 88{ 89 genl_unregister_family(&family); 90} 91 92static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb) 93{ 94 struct dlm_rsb *r = lkb->lkb_resource; 95 96 memset(data, 0, sizeof(struct dlm_lock_data)); 97 98 data->version = DLM_LOCK_DATA_VERSION; 99 data->nodeid = lkb->lkb_nodeid; 100 data->ownpid = lkb->lkb_ownpid; 101 data->id = lkb->lkb_id; 102 data->remid = lkb->lkb_remid; 103 data->status = lkb->lkb_status; 104 data->grmode = lkb->lkb_grmode; 105 data->rqmode = lkb->lkb_rqmode; 106 if (lkb->lkb_ua) 107 data->xid = lkb->lkb_ua->xid; 108 if (r) { 109 data->lockspace_id = r->res_ls->ls_global_id; 110 data->resource_namelen = r->res_length; 111 memcpy(data->resource_name, r->res_name, r->res_length); 112 } 113} 114 115void dlm_timeout_warn(struct dlm_lkb *lkb) 116{ 117 struct sk_buff *uninitialized_var(send_skb); 118 struct dlm_lock_data *data; 119 size_t size; 120 int rv; 121 122 size = nla_total_size(sizeof(struct dlm_lock_data)) + 123 nla_total_size(0); /* why this? */ 124 125 rv = prepare_data(DLM_CMD_TIMEOUT, &send_skb, size); 126 if (rv < 0) 127 return; 128 129 data = mk_data(send_skb); 130 if (!data) { 131 nlmsg_free(send_skb); 132 return; 133 } 134 135 fill_data(data, lkb); 136 137 send_data(send_skb); 138} 139