Linux kernel mirror (for testing)
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linux
1#ifndef _RAID10_H
2#define _RAID10_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
13typedef struct r10bio_s r10bio_t;
14
15struct r10_private_data_s {
16 mddev_t *mddev;
17 mirror_info_t *mirrors;
18 int raid_disks;
19 int working_disks;
20 spinlock_t device_lock;
21
22 /* geometry */
23 int near_copies; /* number of copies layed out raid0 style */
24 int far_copies; /* number of copies layed out
25 * at large strides across drives
26 */
27 int copies; /* near_copies * far_copies.
28 * must be <= raid_disks
29 */
30 sector_t stride; /* distance between far copies.
31 * This is size / far_copies
32 */
33
34 int chunk_shift; /* shift from chunks to sectors */
35 sector_t chunk_mask;
36
37 struct list_head retry_list;
38 /* for use when syncing mirrors: */
39
40 spinlock_t resync_lock;
41 int nr_pending;
42 int barrier;
43 sector_t next_resync;
44
45 wait_queue_head_t wait_idle;
46 wait_queue_head_t wait_resume;
47
48 mempool_t *r10bio_pool;
49 mempool_t *r10buf_pool;
50};
51
52typedef struct r10_private_data_s conf_t;
53
54/*
55 * this is the only point in the RAID code where we violate
56 * C type safety. mddev->private is an 'opaque' pointer.
57 */
58#define mddev_to_conf(mddev) ((conf_t *) mddev->private)
59
60/*
61 * this is our 'private' RAID10 bio.
62 *
63 * it contains information about what kind of IO operations were started
64 * for this RAID10 operation, and about their status:
65 */
66
67struct r10bio_s {
68 atomic_t remaining; /* 'have we finished' count,
69 * used from IRQ handlers
70 */
71 sector_t sector; /* virtual sector number */
72 int sectors;
73 unsigned long state;
74 mddev_t *mddev;
75 /*
76 * original bio going to /dev/mdx
77 */
78 struct bio *master_bio;
79 /*
80 * if the IO is in READ direction, then this is where we read
81 */
82 int read_slot;
83
84 struct list_head retry_list;
85 /*
86 * if the IO is in WRITE direction, then multiple bios are used,
87 * one for each copy.
88 * When resyncing we also use one for each copy.
89 * When reconstructing, we use 2 bios, one for read, one for write.
90 * We choose the number when they are allocated.
91 */
92 struct {
93 struct bio *bio;
94 sector_t addr;
95 int devnum;
96 } devs[0];
97};
98
99/* bits for r10bio.state */
100#define R10BIO_Uptodate 0
101#define R10BIO_IsSync 1
102#define R10BIO_IsRecover 2
103#endif