fs: dlm: remove deprecated code parts

This patch removes code parts which was declared deprecated by
commit 6b0afc0cc3e9 ("fs: dlm: don't use deprecated timeout features by
default"). This contains the following dlm functionality:

- start a cancel of a dlm request did not complete after certain timeout:
  The current way how dlm cancellation works and interfering with other
  dlm requests triggered by the user can end in an overlapping and
  returning in -EBUSY. The most user don't handle this case and are
  unaware that DLM can return such errno in such situation. Due the
  timeout the user are mostly unaware when this happens.
- start a netlink warning messages for user space if dlm requests did
  not complete after certain timeout:
  This feature was never being built in the only known dlm user space side.
  As we are to remove the timeout cancellation feature we can directly
  remove this feature as well.

There might be the possibility to bring the timeout cancellation feature
back. However the current way of handling the -EBUSY case which is only
a software limitation and not a hardware limitation should be changed.
We minimize the current code base in DLM cancellation feature to not have
to deal with those existing features while solving the DLM cancellation
feature in general.

UAPI define DLM_LSFL_TIMEWARN is commented as deprecated and reserved
value. We should avoid at first to give it a new meaning but let
possible users still compile by keeping this define. In far future we
can give this flag a new meaning. The same for the DLM_LKF_TIMEOUT lock
request flag.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

1 files changed, 0 insertions, 139 deletions

diff --git a/fs/dlm/netlink.c b/fs/dlm/netlink.c
deleted file mode 100644
index 4de4b8651c6c..000000000000
--- a/fs/dlm/netlink.c
+++ /dev/null
@@ -1,139 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2007 Red Hat, Inc.  All rights reserved.
- */
-
-#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;
-
-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 const struct genl_small_ops dlm_nl_ops[] = {
-	{
-		.cmd	= DLM_CMD_HELLO,
-		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.doit	= user_cmd,
-	},
-};
-
-static struct genl_family family __ro_after_init = {
-	.name		= DLM_GENL_NAME,
-	.version	= DLM_GENL_VERSION,
-	.small_ops	= dlm_nl_ops,
-	.n_small_ops	= ARRAY_SIZE(dlm_nl_ops),
-	.resv_start_op	= DLM_CMD_HELLO + 1,
-	.module		= THIS_MODULE,
-};
-
-int __init dlm_netlink_init(void)
-{
-	return genl_register_family(&family);
-}
-
-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 *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);
-}
-