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139 lines
2.9 KiB
139 lines
2.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2007 Red Hat, Inc. All rights reserved. |
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*/ |
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#include <net/genetlink.h> |
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#include <linux/dlm.h> |
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#include <linux/dlm_netlink.h> |
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#include <linux/gfp.h> |
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#include "dlm_internal.h" |
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static uint32_t dlm_nl_seqnum; |
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static uint32_t listener_nlportid; |
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static struct genl_family family; |
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static int prepare_data(u8 cmd, struct sk_buff **skbp, size_t size) |
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{ |
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struct sk_buff *skb; |
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void *data; |
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skb = genlmsg_new(size, GFP_NOFS); |
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if (!skb) |
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return -ENOMEM; |
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/* add the message headers */ |
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data = genlmsg_put(skb, 0, dlm_nl_seqnum++, &family, 0, cmd); |
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if (!data) { |
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nlmsg_free(skb); |
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return -EINVAL; |
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} |
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*skbp = skb; |
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return 0; |
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} |
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static struct dlm_lock_data *mk_data(struct sk_buff *skb) |
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{ |
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struct nlattr *ret; |
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ret = nla_reserve(skb, DLM_TYPE_LOCK, sizeof(struct dlm_lock_data)); |
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if (!ret) |
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return NULL; |
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return nla_data(ret); |
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} |
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static int send_data(struct sk_buff *skb) |
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{ |
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struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data); |
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void *data = genlmsg_data(genlhdr); |
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genlmsg_end(skb, data); |
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return genlmsg_unicast(&init_net, skb, listener_nlportid); |
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} |
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static int user_cmd(struct sk_buff *skb, struct genl_info *info) |
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{ |
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listener_nlportid = info->snd_portid; |
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printk("user_cmd nlpid %u\n", listener_nlportid); |
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return 0; |
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} |
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static const struct genl_small_ops dlm_nl_ops[] = { |
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{ |
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.cmd = DLM_CMD_HELLO, |
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.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
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.doit = user_cmd, |
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}, |
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}; |
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static struct genl_family family __ro_after_init = { |
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.name = DLM_GENL_NAME, |
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.version = DLM_GENL_VERSION, |
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.small_ops = dlm_nl_ops, |
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.n_small_ops = ARRAY_SIZE(dlm_nl_ops), |
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.resv_start_op = DLM_CMD_HELLO + 1, |
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.module = THIS_MODULE, |
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}; |
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int __init dlm_netlink_init(void) |
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{ |
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return genl_register_family(&family); |
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} |
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void dlm_netlink_exit(void) |
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{ |
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genl_unregister_family(&family); |
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} |
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static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb) |
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{ |
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struct dlm_rsb *r = lkb->lkb_resource; |
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memset(data, 0, sizeof(struct dlm_lock_data)); |
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data->version = DLM_LOCK_DATA_VERSION; |
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data->nodeid = lkb->lkb_nodeid; |
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data->ownpid = lkb->lkb_ownpid; |
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data->id = lkb->lkb_id; |
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data->remid = lkb->lkb_remid; |
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data->status = lkb->lkb_status; |
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data->grmode = lkb->lkb_grmode; |
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data->rqmode = lkb->lkb_rqmode; |
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if (lkb->lkb_ua) |
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data->xid = lkb->lkb_ua->xid; |
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if (r) { |
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data->lockspace_id = r->res_ls->ls_global_id; |
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data->resource_namelen = r->res_length; |
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memcpy(data->resource_name, r->res_name, r->res_length); |
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} |
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} |
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void dlm_timeout_warn(struct dlm_lkb *lkb) |
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{ |
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struct sk_buff *send_skb; |
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struct dlm_lock_data *data; |
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size_t size; |
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int rv; |
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size = nla_total_size(sizeof(struct dlm_lock_data)) + |
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nla_total_size(0); /* why this? */ |
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rv = prepare_data(DLM_CMD_TIMEOUT, &send_skb, size); |
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if (rv < 0) |
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return; |
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data = mk_data(send_skb); |
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if (!data) { |
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nlmsg_free(send_skb); |
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return; |
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} |
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fill_data(data, lkb); |
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send_data(send_skb); |
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} |
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