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 struct mdinfo;
  21 struct md_message {
  22         int seq;
  23         int num_bytes;
  24         void *buf;
  25 };
  26
  27 enum md_message_action {
  28         md_action_ping_monitor,
  29         md_action_remove_device,
  30 };
  31
  32 struct md_generic_cmd {
  33         enum md_message_action action;
  34 };
  35
  36 struct md_remove_device_cmd {
  37         enum md_message_action action;
  38         dev_t rdev;
  39 };
  40
  41 /* union of all known command types, used to sanity check ->num_bytes
  42  * on the receive path
  43  */
  44 union md_message_commands {
  45         struct md_generic_cmd generic;
  46         struct md_remove_device_cmd remove;
  47 };
  48
  49 extern const int start_magic;
  50 extern const int end_magic;
  51
  52 extern int receive_message(int fd, struct md_message *msg, int tmo);
  53 extern int send_message(int fd, struct md_message *msg, int tmo);
  54 extern int ack(int fd, int seq, int tmo);
  55 extern int nack(int fd, int err, int tmo);
  56 extern int connect_monitor(char *devname);
  57 extern int ping_monitor(char *devname);
  58 extern int send_remove_device(int fd, dev_t rdev, int seq, int tmo);
  59