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git.ipfire.org Git - thirdparty/mdadm.git/blob - mdmon.h
2 * mdmon - monitor external metadata arrays
4 * Copyright (C) 2007-2009 Neil Brown <neilb@suse.de>
5 * Copyright (C) 2007-2009 Intel Corporation
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
21 extern const char Name
[];
23 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
,
24 clean
, active
, write_pending
, active_idle
, bad_word
};
26 enum sync_action
{ idle
, reshape
, resync
, recover
, check
, repair
, bad_action
};
30 struct supertype
*container
;
31 struct active_array
*next
, *replaces
;
36 int metadata_fd
; /* for monitoring rw/ro status */
37 int sync_completed_fd
; /* for checkpoint notification events */
38 unsigned long long last_checkpoint
; /* sync_completed fires for many
39 * reasons this field makes sure the
40 * kernel has made progress before
41 * moving the checkpoint. It is
42 * cleared by the metadata handler
43 * when it determines recovery is
47 enum array_state prev_state
, curr_state
, next_state
;
48 enum sync_action prev_action
, curr_action
, next_action
;
50 int check_degraded
; /* flag set by mon, read by manage */
51 int check_reshape
; /* flag set by mon, read by manage */
55 * Metadata updates are handled by the monitor thread,
56 * as it has exclusive access to the metadata.
57 * When the manager want to updates metadata, either
58 * for it's own reason (e.g. committing a spare) or
59 * on behalf of mdadm, it creates a metadata_update
60 * structure and queues it to the monitor.
61 * Updates are created and processed by code under the
62 * superswitch. All common code sees them as opaque
65 extern struct metadata_update
*update_queue
, *update_queue_handled
;
69 extern struct active_array
*container
;
70 extern struct active_array
*discard_this
;
71 extern struct active_array
*pending_discard
;
72 extern struct md_generic_cmd
*active_cmd
;
74 void remove_pidfile(char *devname
);
75 void do_monitor(struct supertype
*container
);
76 void do_manager(struct supertype
*container
);
79 int read_dev_state(int fd
);
80 int is_container_member(struct mdstat_ent
*mdstat
, char *container
);
82 struct mdstat_ent
*mdstat_read(int hold
, int start
);
84 extern int exit_now
, manager_ready
;
85 extern int mon_tid
, mgr_tid
;
86 extern int monitor_loop_cnt
;
88 /* helper routine to determine resync completion since MaxSector is a
91 static inline int is_resync_complete(struct mdinfo
*array
)
93 unsigned long long sync_size
= 0;
95 switch(array
->array
.level
) {
100 sync_size
= array
->component_size
;
103 l
= array
->array
.layout
;
104 ncopies
= (l
& 0xff) * ((l
>> 8) & 0xff);
105 sync_size
= array
->component_size
* array
->array
.raid_disks
;
106 sync_size
/= ncopies
;
109 return array
->resync_start
>= sync_size
;