mdmon.h

   1 /*
   2  * mdmon - monitor external metadata arrays
   3  *
   4  * Copyright (C) 2007-2009 Neil Brown <neilb@suse.de>
   5  * Copyright (C) 2007-2009 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 #undef pr_err
  22 #define pr_err(fmt ...) fprintf(stderr, "mdmon: " fmt)
  23
  24 enum array_state { clear, inactive, suspended, readonly, read_auto,
  25                    clean, active, write_pending, active_idle, bad_word};
  26
  27 enum sync_action { idle, reshape, resync, recover, check, repair, bad_action };
  28
  29
  30 struct active_array {
  31         struct mdinfo info;
  32         struct supertype *container;
  33         struct active_array *next, *replaces;
  34         int to_remove;
  35
  36         int action_fd;
  37         int resync_start_fd;
  38         int metadata_fd; /* for monitoring rw/ro status */
  39         int sync_completed_fd; /* for checkpoint notification events */
  40         unsigned long long last_checkpoint; /* sync_completed fires for many
  41                                              * reasons this field makes sure the
  42                                              * kernel has made progress before
  43                                              * moving the checkpoint.  It is
  44                                              * cleared by the metadata handler
  45                                              * when it determines recovery is
  46                                              * terminated.
  47                                              */
  48
  49         enum array_state prev_state, curr_state, next_state;
  50         enum sync_action prev_action, curr_action, next_action;
  51
  52         int check_degraded; /* flag set by mon, read by manage */
  53         int check_reshape; /* flag set by mon, read by manage */
  54 };
  55
  56 /*
  57  * Metadata updates are handled by the monitor thread,
  58  * as it has exclusive access to the metadata.
  59  * When the manager want to updates metadata, either
  60  * for it's own reason (e.g. committing a spare) or
  61  * on behalf of mdadm, it creates a metadata_update
  62  * structure and queues it to the monitor.
  63  * Updates are created and processed by code under the
  64  * superswitch.  All common code sees them as opaque
  65  * blobs.
  66  */
  67 extern struct metadata_update *update_queue, *update_queue_handled;
  68
  69 #define MD_MAJOR 9
  70
  71 extern struct active_array *container;
  72 extern struct active_array *discard_this;
  73 extern struct active_array *pending_discard;
  74 extern struct md_generic_cmd *active_cmd;
  75
  76
  77 void remove_pidfile(char *devname);
  78 void do_monitor(struct supertype *container);
  79 void do_manager(struct supertype *container);
  80 extern int sigterm;
  81
  82 int read_dev_state(int fd);
  83 int is_container_member(struct mdstat_ent *mdstat, char *container);
  84
  85 struct mdstat_ent *mdstat_read(int hold, int start);
  86
  87 extern int exit_now, manager_ready;
  88 extern int mon_tid, mgr_tid;
  89 extern int monitor_loop_cnt;
  90
  91 /* helper routine to determine resync completion since MaxSector is a
  92  * moving target
  93  */
  94 static inline int is_resync_complete(struct mdinfo *array)
  95 {
  96         if (array->resync_start >= array->component_size)
  97                 return 1;
  98         return 0;
  99 }
 100