112 lines
3.5 KiB
C
112 lines
3.5 KiB
C
/*
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* mdmon - monitor external metadata arrays
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*
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* Copyright (C) 2007-2009 Neil Brown <neilb@suse.de>
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* Copyright (C) 2007-2009 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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extern const char Name[];
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enum array_state { clear, inactive, suspended, readonly, read_auto,
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clean, active, write_pending, active_idle, broken, bad_word};
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enum sync_action { idle, reshape, resync, recover, check, repair, bad_action };
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struct active_array {
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struct mdinfo info;
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struct supertype *container;
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struct active_array *next, *replaces;
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int to_remove;
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int action_fd;
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int resync_start_fd;
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int metadata_fd; /* for monitoring rw/ro status */
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int sync_completed_fd; /* for checkpoint notification events */
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int safe_mode_delay_fd;
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unsigned long long last_checkpoint; /* sync_completed fires for many
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* reasons this field makes sure the
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* kernel has made progress before
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* moving the checkpoint. It is
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* cleared by the metadata handler
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* when it determines recovery is
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* terminated.
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*/
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enum array_state prev_state, curr_state, next_state;
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enum sync_action prev_action, curr_action, next_action;
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int check_degraded; /* flag set by mon, read by manage */
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int check_reshape; /* flag set by mon, read by manage */
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};
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/*
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* Metadata updates are handled by the monitor thread,
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* as it has exclusive access to the metadata.
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* When the manager want to updates metadata, either
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* for it's own reason (e.g. committing a spare) or
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* on behalf of mdadm, it creates a metadata_update
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* structure and queues it to the monitor.
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* Updates are created and processed by code under the
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* superswitch. All common code sees them as opaque
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* blobs.
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*/
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extern struct metadata_update *update_queue, *update_queue_handled;
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#define MD_MAJOR 9
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extern struct active_array *container;
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extern struct active_array *discard_this;
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extern struct active_array *pending_discard;
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extern struct md_generic_cmd *active_cmd;
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void remove_pidfile(char *devname);
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void do_monitor(struct supertype *container);
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void do_manager(struct supertype *container);
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extern int sigterm;
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int read_dev_state(int fd);
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int is_container_member(struct mdstat_ent *mdstat, char *container);
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struct mdstat_ent *mdstat_read(int hold, int start);
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extern int exit_now, manager_ready;
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extern int mon_tid, mgr_tid;
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extern int monitor_loop_cnt;
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/* helper routine to determine resync completion since MaxSector is a
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* moving target
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*/
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static inline int is_resync_complete(struct mdinfo *array)
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{
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unsigned long long sync_size = 0;
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int ncopies, l;
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switch(array->array.level) {
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case 1:
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case 4:
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case 5:
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case 6:
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sync_size = array->component_size;
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break;
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case 10:
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l = array->array.layout;
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ncopies = (l & 0xff) * ((l >> 8) & 0xff);
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sync_size = array->component_size * array->array.raid_disks;
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sync_size /= ncopies;
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break;
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}
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return array->resync_start >= sync_size;
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}
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