1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
#ifndef _RAID1_H
#define _RAID1_H
#include <linux/raid/md.h>
struct mirror_info {
int number;
int raid_disk;
kdev_t dev;
int sect_limit;
int head_position;
/*
* State bits:
*/
int operational;
int write_only;
int spare;
int used_slot;
};
struct raid1_private_data {
mddev_t *mddev;
struct mirror_info mirrors[MD_SB_DISKS];
int nr_disks;
int raid_disks;
int working_disks;
int last_used;
unsigned long next_sect;
int sect_count;
mdk_thread_t *thread, *resync_thread;
int resync_mirrors;
struct mirror_info *spare;
md_spinlock_t device_lock;
/* buffer pool */
/* buffer_heads that we have pre-allocated have b_pprev -> &freebh
* and are linked into a stack using b_next
* raid1_bh that are pre-allocated have R1BH_PreAlloc set.
* All these variable are protected by device_lock
*/
struct buffer_head *freebh;
int freebh_cnt; /* how many are on the list */
int freebh_blocked;
struct raid1_bh *freer1;
int freer1_blocked;
int freer1_cnt;
struct raid1_bh *freebuf; /* each bh_req has a page allocated */
md_wait_queue_head_t wait_buffer;
/* for use when syncing mirrors: */
unsigned long start_active, start_ready,
start_pending, start_future;
int cnt_done, cnt_active, cnt_ready,
cnt_pending, cnt_future;
int phase;
int window;
md_wait_queue_head_t wait_done;
md_wait_queue_head_t wait_ready;
md_spinlock_t segment_lock;
};
typedef struct raid1_private_data raid1_conf_t;
/*
* this is the only point in the RAID code where we violate
* C type safety. mddev->private is an 'opaque' pointer.
*/
#define mddev_to_conf(mddev) ((raid1_conf_t *) mddev->private)
/*
* this is our 'private' 'collective' RAID1 buffer head.
* it contains information about what kind of IO operations were started
* for this RAID1 operation, and about their status:
*/
struct raid1_bh {
atomic_t remaining; /* 'have we finished' count,
* used from IRQ handlers
*/
int cmd;
unsigned long state;
mddev_t *mddev;
struct buffer_head *master_bh;
struct buffer_head *mirror_bh_list;
struct buffer_head bh_req;
struct raid1_bh *next_r1; /* next for retry or in free list */
};
/* bits for raid1_bh.state */
#define R1BH_Uptodate 1
#define R1BH_SyncPhase 2
#define R1BH_PreAlloc 3 /* this was pre-allocated, add to free list */
#endif
|
