Linux kernel mirror (for testing)
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linux
1#ifndef _RAID1_H
2#define _RAID1_H
3
4#include <linux/raid/md.h>
5
6typedef struct mirror_info mirror_info_t;
7
8struct mirror_info {
9 mdk_rdev_t *rdev;
10 sector_t head_position;
11};
12
13/*
14 * memory pools need a pointer to the mddev, so they can force an unplug
15 * when memory is tight, and a count of the number of drives that the
16 * pool was allocated for, so they know how much to allocate and free.
17 * mddev->raid_disks cannot be used, as it can change while a pool is active
18 * These two datums are stored in a kmalloced struct.
19 */
20
21struct pool_info {
22 mddev_t *mddev;
23 int raid_disks;
24};
25
26
27typedef struct r1bio_s r1bio_t;
28
29struct r1_private_data_s {
30 mddev_t *mddev;
31 mirror_info_t *mirrors;
32 int raid_disks;
33 int working_disks;
34 int last_used;
35 sector_t next_seq_sect;
36 spinlock_t device_lock;
37
38 struct list_head retry_list;
39 /* for use when syncing mirrors: */
40
41 spinlock_t resync_lock;
42 int nr_pending;
43 int barrier;
44 sector_t next_resync;
45
46 wait_queue_head_t wait_idle;
47 wait_queue_head_t wait_resume;
48
49 struct pool_info *poolinfo;
50
51 mempool_t *r1bio_pool;
52 mempool_t *r1buf_pool;
53};
54
55typedef struct r1_private_data_s conf_t;
56
57/*
58 * this is the only point in the RAID code where we violate
59 * C type safety. mddev->private is an 'opaque' pointer.
60 */
61#define mddev_to_conf(mddev) ((conf_t *) mddev->private)
62
63/*
64 * this is our 'private' RAID1 bio.
65 *
66 * it contains information about what kind of IO operations were started
67 * for this RAID1 operation, and about their status:
68 */
69
70struct r1bio_s {
71 atomic_t remaining; /* 'have we finished' count,
72 * used from IRQ handlers
73 */
74 sector_t sector;
75 int sectors;
76 unsigned long state;
77 mddev_t *mddev;
78 /*
79 * original bio going to /dev/mdx
80 */
81 struct bio *master_bio;
82 /*
83 * if the IO is in READ direction, then this is where we read
84 */
85 int read_disk;
86
87 struct list_head retry_list;
88 /*
89 * if the IO is in WRITE direction, then multiple bios are used.
90 * We choose the number when they are allocated.
91 */
92 struct bio *bios[0];
93};
94
95/* bits for r1bio.state */
96#define R1BIO_Uptodate 0
97#define R1BIO_IsSync 1
98#endif