mdadm/mdmon.h

#ifdef DEBUG
#define dprintf(fmt, arg...) \
	fprintf(stderr, fmt, ##arg)
#else
#define dprintf(fmt, arg...) \
        ({ if (0) fprintf(stderr, fmt, ##arg); 0; })
#endif

enum array_state { clear, inactive, suspended, readonly, read_auto,
		   clean, active, write_pending, active_idle, bad_word};

enum sync_action { idle, reshape, resync, recover, check, repair, bad_action };


struct active_array {
	struct mdinfo info;
	struct supertype *container;
	struct active_array *next, *replaces;

	int action_fd;
	int resync_start_fd;

	enum array_state prev_state, curr_state, next_state;
	enum sync_action prev_action, curr_action, next_action;

	int check_degraded; /* flag set by mon, read by manage */

	int devnum;

	unsigned long long resync_start;
};

/*
 * Metadata updates are handled by the monitor thread,
 * as it has exclusive access to the metadata.
 * When the manager want to updates metadata, either
 * for it's own reason (e.g. committing a spare) or
 * on behalf of mdadm, it creates a metadata_update
 * structure and queues it to the monitor.
 * Updates are created and processed by code under the
 * superswitch.  All common code sees them as opaque
 * blobs.
 */
struct metadata_update {
	int	len;
	char	*buf;
	void	*space; /* allocated space that monitor will use */
	struct metadata_update *next;
};
extern struct metadata_update *update_queue, *update_queue_handled;

#define MD_MAJOR 9

extern struct active_array *container;
extern struct active_array *discard_this;
extern struct active_array *pending_discard;
extern struct md_generic_cmd *active_cmd;


void remove_pidfile(char *devname);
void do_monitor(struct supertype *container);
void do_manager(struct supertype *container);

int read_dev_state(int fd);

struct mdstat_ent *mdstat_read(int hold, int start);

extern int exit_now, manager_ready;