msg.h

   1 /*
   2  * Copyright (C) 2008 Intel Corporation
   3  *
   4  *      mdmon socket / message handling
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20
  21 struct mdinfo;
  22
  23 struct mdinfo;
  24 struct md_message {
  25         int seq;
  26         int num_bytes;
  27         void *buf;
  28 };
  29
  30 enum md_message_action {
  31         md_action_ping_monitor,
  32         md_action_remove_device,
  33 };
  34
  35 struct md_generic_cmd {
  36         enum md_message_action action;
  37 };
  38
  39 struct md_remove_device_cmd {
  40         enum md_message_action action;
  41         dev_t rdev;
  42 };
  43
  44 /* union of all known command types, used to sanity check ->num_bytes
  45  * on the receive path
  46  */
  47 union md_message_commands {
  48         struct md_generic_cmd generic;
  49         struct md_remove_device_cmd remove;
  50 };
  51
  52 extern const int start_magic;
  53 extern const int end_magic;
  54
  55 extern int receive_message(int fd, struct md_message *msg, int tmo);
  56 extern int send_message(int fd, struct md_message *msg, int tmo);
  57 extern int ack(int fd, int seq, int tmo);
  58 extern int nack(int fd, int err, int tmo);
  59 extern int connect_monitor(char *devname);
  60 extern int ping_monitor(char *devname);
  61 extern int send_remove_device(int fd, dev_t rdev, int seq, int tmo);
  62