mdmon.h

   1 /*
   2  * mdmon - monitor external metadata arrays
   3  *
   4  * Copyright (C) 2007-2008 Neil Brown <neilb@suse.de>
   5  * Copyright (C) 2007-2008 Intel Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms and conditions of the GNU General Public License,
   9  * version 2, as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 enum array_state { clear, inactive, suspended, readonly, read_auto,
  22                    clean, active, write_pending, active_idle, bad_word};
  23
  24 enum sync_action { idle, reshape, resync, recover, check, repair, bad_action };
  25
  26
  27 struct active_array {
  28         struct mdinfo info;
  29         struct supertype *container;
  30         struct active_array *next, *replaces;
  31
  32         int action_fd;
  33         int resync_start_fd;
  34         int metadata_fd; /* for monitoring rw/ro status */
  35
  36         enum array_state prev_state, curr_state, next_state;
  37         enum sync_action prev_action, curr_action, next_action;
  38
  39         int check_degraded; /* flag set by mon, read by manage */
  40
  41         int devnum;
  42
  43         unsigned long long resync_start;
  44 };
  45
  46 /*
  47  * Metadata updates are handled by the monitor thread,
  48  * as it has exclusive access to the metadata.
  49  * When the manager want to updates metadata, either
  50  * for it's own reason (e.g. committing a spare) or
  51  * on behalf of mdadm, it creates a metadata_update
  52  * structure and queues it to the monitor.
  53  * Updates are created and processed by code under the
  54  * superswitch.  All common code sees them as opaque
  55  * blobs.
  56  */
  57 extern struct metadata_update *update_queue, *update_queue_handled;
  58
  59 #define MD_MAJOR 9
  60
  61 extern struct active_array *container;
  62 extern struct active_array *discard_this;
  63 extern struct active_array *pending_discard;
  64 extern struct md_generic_cmd *active_cmd;
  65
  66
  67 void remove_pidfile(char *devname);
  68 void do_monitor(struct supertype *container);
  69 void do_manager(struct supertype *container);
  70 int make_control_sock(char *devname);
  71 int make_pidfile(char *devname, int o_excl);
  72 extern int socket_hup_requested;
  73 extern int sigterm;
  74
  75 int read_dev_state(int fd);
  76 int get_resync_start(struct active_array *a);
  77 int is_container_member(struct mdstat_ent *mdstat, char *container);
  78
  79 struct mdstat_ent *mdstat_read(int hold, int start);
  80
  81 extern int exit_now, manager_ready;
  82 extern int mon_tid, mgr_tid;
  83 extern int monitor_loop_cnt;
  84
  85 /* helper routine to determine resync completion since MaxSector is a
  86  * moving target
  87  */
  88 static inline int is_resync_complete(struct active_array *a)
  89 {
  90         if (a->resync_start >= a->info.component_size)
  91                 return 1;
  92         return 0;
  93 }
  94