| /* |
| * Copyright (C) 2007 Red Hat, Inc. All rights reserved. |
| * |
| * This copyrighted material is made available to anyone wishing to use, |
| * modify, copy, or redistribute it subject to the terms and conditions |
| * of the GNU General Public License v.2. |
| */ |
| |
| #include <net/genetlink.h> |
| #include <linux/dlm.h> |
| #include <linux/dlm_netlink.h> |
| |
| #include "dlm_internal.h" |
| |
| static uint32_t dlm_nl_seqnum; |
| static uint32_t listener_nlpid; |
| |
| static struct genl_family family = { |
| .id = GENL_ID_GENERATE, |
| .name = DLM_GENL_NAME, |
| .version = DLM_GENL_VERSION, |
| }; |
| |
| static int prepare_data(u8 cmd, struct sk_buff **skbp, size_t size) |
| { |
| struct sk_buff *skb; |
| void *data; |
| |
| skb = genlmsg_new(size, GFP_KERNEL); |
| if (!skb) |
| return -ENOMEM; |
| |
| /* add the message headers */ |
| data = genlmsg_put(skb, 0, dlm_nl_seqnum++, &family, 0, cmd); |
| if (!data) { |
| nlmsg_free(skb); |
| return -EINVAL; |
| } |
| |
| *skbp = skb; |
| return 0; |
| } |
| |
| static struct dlm_lock_data *mk_data(struct sk_buff *skb) |
| { |
| struct nlattr *ret; |
| |
| ret = nla_reserve(skb, DLM_TYPE_LOCK, sizeof(struct dlm_lock_data)); |
| if (!ret) |
| return NULL; |
| return nla_data(ret); |
| } |
| |
| static int send_data(struct sk_buff *skb) |
| { |
| struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data); |
| void *data = genlmsg_data(genlhdr); |
| int rv; |
| |
| rv = genlmsg_end(skb, data); |
| if (rv < 0) { |
| nlmsg_free(skb); |
| return rv; |
| } |
| |
| return genlmsg_unicast(skb, listener_nlpid); |
| } |
| |
| static int user_cmd(struct sk_buff *skb, struct genl_info *info) |
| { |
| listener_nlpid = info->snd_pid; |
| printk("user_cmd nlpid %u\n", listener_nlpid); |
| return 0; |
| } |
| |
| static struct genl_ops dlm_nl_ops = { |
| .cmd = DLM_CMD_HELLO, |
| .doit = user_cmd, |
| }; |
| |
| int dlm_netlink_init(void) |
| { |
| int rv; |
| |
| rv = genl_register_family(&family); |
| if (rv) |
| return rv; |
| |
| rv = genl_register_ops(&family, &dlm_nl_ops); |
| if (rv < 0) |
| goto err; |
| return 0; |
| err: |
| genl_unregister_family(&family); |
| return rv; |
| } |
| |
| void dlm_netlink_exit(void) |
| { |
| genl_unregister_ops(&family, &dlm_nl_ops); |
| genl_unregister_family(&family); |
| } |
| |
| static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb) |
| { |
| struct dlm_rsb *r = lkb->lkb_resource; |
| struct dlm_user_args *ua = (struct dlm_user_args *) lkb->lkb_astparam; |
| |
| memset(data, 0, sizeof(struct dlm_lock_data)); |
| |
| data->version = DLM_LOCK_DATA_VERSION; |
| data->nodeid = lkb->lkb_nodeid; |
| data->ownpid = lkb->lkb_ownpid; |
| data->id = lkb->lkb_id; |
| data->remid = lkb->lkb_remid; |
| data->status = lkb->lkb_status; |
| data->grmode = lkb->lkb_grmode; |
| data->rqmode = lkb->lkb_rqmode; |
| data->timestamp = lkb->lkb_timestamp; |
| if (ua) |
| data->xid = ua->xid; |
| if (r) { |
| data->lockspace_id = r->res_ls->ls_global_id; |
| data->resource_namelen = r->res_length; |
| memcpy(data->resource_name, r->res_name, r->res_length); |
| } |
| } |
| |
| void dlm_timeout_warn(struct dlm_lkb *lkb) |
| { |
| struct dlm_lock_data *data; |
| struct sk_buff *send_skb; |
| size_t size; |
| int rv; |
| |
| log_debug(lkb->lkb_resource->res_ls, "timeout_warn %x", lkb->lkb_id); |
| |
| size = nla_total_size(sizeof(struct dlm_lock_data)) + |
| nla_total_size(0); /* why this? */ |
| |
| rv = prepare_data(DLM_CMD_TIMEOUT, &send_skb, size); |
| if (rv < 0) |
| return; |
| |
| data = mk_data(send_skb); |
| if (!data) { |
| nlmsg_free(send_skb); |
| return; |
| } |
| |
| fill_data(data, lkb); |
| |
| send_data(send_skb); |
| } |
| |