diff options
Diffstat (limited to 'mdmon.h')
| -rw-r--r-- | mdmon.h | 111 |
1 files changed, 111 insertions, 0 deletions
@@ -0,0 +1,111 @@ +/* + * 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; + + int check_degraded; /* flag set by mon, read by manage */ + int check_reshape; /* flag set by mon, read by manage */ +}; + +/* + * 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); +int 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; +} |