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-rw-r--r--fs/dlm/netlink.c153
1 files changed, 153 insertions, 0 deletions
diff --git a/fs/dlm/netlink.c b/fs/dlm/netlink.c
new file mode 100644
index 0000000..863b87d
--- /dev/null
+++ b/fs/dlm/netlink.c
@@ -0,0 +1,153 @@
+/*
+ * 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;
+
+ 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);
+}
+
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