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/*
* mdmon - monitor external metadata arrays
*
* Copyright (C) 2007-2009 Neil Brown <neilb@suse.de>
* Copyright (C) 2007-2009 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*/
extern const char Name[];
enum array_state { clear, inactive, suspended, readonly, read_auto,
clean, active, write_pending, active_idle, broken, 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 to_remove;
int action_fd;
int resync_start_fd;
int metadata_fd; /* for monitoring rw/ro status */
int sync_completed_fd; /* for checkpoint notification events */
int safe_mode_delay_fd;
unsigned long long last_checkpoint; /* sync_completed fires for many
* reasons this field makes sure the
* kernel has made progress before
* moving the checkpoint. It is
* cleared by the metadata handler
* when it determines recovery is
* terminated.
*/
enum array_state prev_state, curr_state, next_state;
enum sync_action prev_action, curr_action, next_action;
bool check_degraded : 1; /* flag set by mon, read by manage */
bool check_reshape : 1; /* flag set by mon, read by manage */
/**
* Signalize managemon there is a mdi to be removed.
* Monitor must acknowledge faulty state first.
*/
bool check_member_remove : 1;
};
/*
* 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.
*/
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);
extern int sigterm;
int read_dev_state(int fd);
bool is_container_member(struct mdstat_ent *mdstat, char *container);
struct mdstat_ent *mdstat_read(int hold, int start);
extern int exit_now, manager_ready;
extern int mon_tid, mgr_tid;
extern int monitor_loop_cnt;
/* helper routine to determine resync completion since MaxSector is a
* moving target
*/
static inline int is_resync_complete(struct mdinfo *array)
{
unsigned long long sync_size = 0;
int ncopies, l;
switch(array->array.level) {
case 1:
case 4:
case 5:
case 6:
sync_size = array->component_size;
break;
case 10:
l = array->array.layout;
ncopies = (l & 0xff) * ((l >> 8) & 0xff);
sync_size = array->component_size * array->array.raid_disks;
sync_size /= ncopies;
break;
}
return array->resync_start >= sync_size;
}
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