diff options
Diffstat (limited to 'fs/dlm/netlink.c')
-rw-r--r-- | fs/dlm/netlink.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/fs/dlm/netlink.c b/fs/dlm/netlink.c new file mode 100644 index 000000000..1e6e22713 --- /dev/null +++ b/fs/dlm/netlink.c @@ -0,0 +1,136 @@ +/* + * 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 <linux/gfp.h> + +#include "dlm_internal.h" + +static uint32_t dlm_nl_seqnum; +static uint32_t listener_nlportid; + +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_NOFS); + 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); + + genlmsg_end(skb, data); + + return genlmsg_unicast(&init_net, skb, listener_nlportid); +} + +static int user_cmd(struct sk_buff *skb, struct genl_info *info) +{ + listener_nlportid = info->snd_portid; + printk("user_cmd nlpid %u\n", listener_nlportid); + return 0; +} + +static struct genl_ops dlm_nl_ops[] = { + { + .cmd = DLM_CMD_HELLO, + .doit = user_cmd, + }, +}; + +int __init dlm_netlink_init(void) +{ + return genl_register_family_with_ops(&family, dlm_nl_ops); +} + +void dlm_netlink_exit(void) +{ + genl_unregister_family(&family); +} + +static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb) +{ + struct dlm_rsb *r = lkb->lkb_resource; + + 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; + if (lkb->lkb_ua) + data->xid = lkb->lkb_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 sk_buff *uninitialized_var(send_skb); + struct dlm_lock_data *data; + size_t size; + int rv; + + 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); +} + |