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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 | ||
32 | int action_fd; | |
33 | int resync_start_fd; | |
34 | int metadata_fd; /* for monitoring rw/ro status */ | |
35 | int sync_completed_fd; /* for checkpoint notification events */ | |
36 | unsigned long long last_checkpoint; /* sync_completed fires for many | |
37 | * reasons this field makes sure the | |
38 | * kernel has made progress before | |
39 | * moving the checkpoint. It is | |
40 | * cleared by the metadata handler | |
41 | * when it determines recovery is | |
42 | * terminated. | |
43 | */ | |
44 | ||
45 | enum array_state prev_state, curr_state, next_state; | |
46 | enum sync_action prev_action, curr_action, next_action; | |
47 | ||
48 | int check_degraded; /* flag set by mon, read by manage */ | |
49 | ||
50 | int devnum; | |
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 |