Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / dlm / netlink.c

diff --git a/kernel/fs/dlm/netlink.c b/kernel/fs/dlm/netlink.c
new file mode 100644 (file)
index 0000000..1e6e227
--- /dev/null
+++ b/kernel/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);
+}
+