mdmon.h

   1 #ifdef DEBUG
   2 #define dprintf(fmt, arg...) \
   3         fprintf(stderr, fmt, ##arg)
   4 #else
   5 #define dprintf(fmt, arg...) \
   6         ({ if (0) fprintf(stderr, fmt, ##arg); 0; })
   7 #endif
   8
   9 enum array_state { clear, inactive, suspended, readonly, read_auto,
  10                    clean, active, write_pending, active_idle, bad_word};
  11
  12 enum sync_action { idle, reshape, resync, recover, check, repair, bad_action };
  13
  14
  15 struct active_array {
  16         struct mdinfo info;
  17         struct supertype *container;
  18         struct active_array *next, *replaces;
  19
  20         int action_fd;
  21         int resync_start_fd;
  22         int metadata_fd; /* for monitoring rw/ro status */
  23
  24         enum array_state prev_state, curr_state, next_state;
  25         enum sync_action prev_action, curr_action, next_action;
  26
  27         int check_degraded; /* flag set by mon, read by manage */
  28
  29         int devnum;
  30
  31         unsigned long long resync_start;
  32 };
  33
  34 /*
  35  * Metadata updates are handled by the monitor thread,
  36  * as it has exclusive access to the metadata.
  37  * When the manager want to updates metadata, either
  38  * for it's own reason (e.g. committing a spare) or
  39  * on behalf of mdadm, it creates a metadata_update
  40  * structure and queues it to the monitor.
  41  * Updates are created and processed by code under the
  42  * superswitch.  All common code sees them as opaque
  43  * blobs.
  44  */
  45 extern struct metadata_update *update_queue, *update_queue_handled;
  46
  47 #define MD_MAJOR 9
  48
  49 extern struct active_array *container;
  50 extern struct active_array *discard_this;
  51 extern struct active_array *pending_discard;
  52 extern struct md_generic_cmd *active_cmd;
  53
  54
  55 void remove_pidfile(char *devname);
  56 void do_monitor(struct supertype *container);
  57 void do_manager(struct supertype *container);
  58 int make_control_sock(char *devname);
  59 int make_pidfile(char *devname, int o_excl);
  60 extern int socket_hup_requested;
  61
  62 int read_dev_state(int fd);
  63 int get_resync_start(struct active_array *a);
  64
  65 struct mdstat_ent *mdstat_read(int hold, int start);
  66
  67 extern int exit_now, manager_ready;
  68 extern int mon_tid, mgr_tid;
  69 extern int monitor_loop_cnt;