]> git.ipfire.org Git - thirdparty/mdadm.git/blob - mdmon.h
Discard devnum in favour of devnm
[thirdparty/mdadm.git] / mdmon.h
1 /*
2 * mdmon - monitor external metadata arrays
3 *
4 * Copyright (C) 2007-2009 Neil Brown <neilb@suse.de>
5 * Copyright (C) 2007-2009 Intel Corporation
6 *
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.
10 *
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
14 * more details.
15 *
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.
19 */
20
21 enum array_state { clear, inactive, suspended, readonly, read_auto,
22 clean, active, write_pending, active_idle, bad_word};
23
24 enum sync_action { idle, reshape, resync, recover, check, repair, bad_action };
25
26
27 struct active_array {
28 struct mdinfo info;
29 struct supertype *container;
30 struct active_array *next, *replaces;
31 int to_remove;
32
33 int action_fd;
34 int resync_start_fd;
35 int metadata_fd; /* for monitoring rw/ro status */
36 int sync_completed_fd; /* for checkpoint notification events */
37 unsigned long long last_checkpoint; /* sync_completed fires for many
38 * reasons this field makes sure the
39 * kernel has made progress before
40 * moving the checkpoint. It is
41 * cleared by the metadata handler
42 * when it determines recovery is
43 * terminated.
44 */
45
46 enum array_state prev_state, curr_state, next_state;
47 enum sync_action prev_action, curr_action, next_action;
48
49 int check_degraded; /* flag set by mon, read by manage */
50 int check_reshape; /* flag set by mon, read by manage */
51 };
52
53 /*
54 * Metadata updates are handled by the monitor thread,
55 * as it has exclusive access to the metadata.
56 * When the manager want to updates metadata, either
57 * for it's own reason (e.g. committing a spare) or
58 * on behalf of mdadm, it creates a metadata_update
59 * structure and queues it to the monitor.
60 * Updates are created and processed by code under the
61 * superswitch. All common code sees them as opaque
62 * blobs.
63 */
64 extern struct metadata_update *update_queue, *update_queue_handled;
65
66 #define MD_MAJOR 9
67
68 extern struct active_array *container;
69 extern struct active_array *discard_this;
70 extern struct active_array *pending_discard;
71 extern struct md_generic_cmd *active_cmd;
72
73
74 void remove_pidfile(char *devname);
75 void do_monitor(struct supertype *container);
76 void do_manager(struct supertype *container);
77 extern int sigterm;
78
79 int read_dev_state(int fd);
80 int is_container_member(struct mdstat_ent *mdstat, char *container);
81
82 struct mdstat_ent *mdstat_read(int hold, int start);
83
84 extern int exit_now, manager_ready;
85 extern int mon_tid, mgr_tid;
86 extern int monitor_loop_cnt;
87
88 /* helper routine to determine resync completion since MaxSector is a
89 * moving target
90 */
91 static inline int is_resync_complete(struct mdinfo *array)
92 {
93 if (array->resync_start >= array->component_size)
94 return 1;
95 return 0;
96 }
97