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 /* queue pending writes and submit them on unplug */
40 struct bio_list pending_bio_list;
41 /* queue of writes that have been unplugged */
42 struct bio_list flushing_bio_list;
43
44 /* for use when syncing mirrors: */
45
46 spinlock_t resync_lock;
47 int nr_pending;
48 int barrier;
49 sector_t next_resync;
50 int fullsync; /* set to 1 if a full sync is needed,
51 * (fresh device added).
52 * Cleared when a sync completes.
53 */
54
55 wait_queue_head_t wait_idle;
56 wait_queue_head_t wait_resume;
57
58 struct pool_info *poolinfo;
59
60 mempool_t *r1bio_pool;
61 mempool_t *r1buf_pool;
62};
63
64typedef struct r1_private_data_s conf_t;
65
66/*
67 * this is the only point in the RAID code where we violate
68 * C type safety. mddev->private is an 'opaque' pointer.
69 */
70#define mddev_to_conf(mddev) ((conf_t *) mddev->private)
71
72/*
73 * this is our 'private' RAID1 bio.
74 *
75 * it contains information about what kind of IO operations were started
76 * for this RAID1 operation, and about their status:
77 */
78
79struct r1bio_s {
80 atomic_t remaining; /* 'have we finished' count,
81 * used from IRQ handlers
82 */
83 sector_t sector;
84 int sectors;
85 unsigned long state;
86 mddev_t *mddev;
87 /*
88 * original bio going to /dev/mdx
89 */
90 struct bio *master_bio;
91 /*
92 * if the IO is in READ direction, then this is where we read
93 */
94 int read_disk;
95
96 struct list_head retry_list;
97 struct bitmap_update *bitmap_update;
98 /*
99 * if the IO is in WRITE direction, then multiple bios are used.
100 * We choose the number when they are allocated.
101 */
102 struct bio *bios[0];
103 /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
104};
105
106/* bits for r1bio.state */
107#define R1BIO_Uptodate 0
108#define R1BIO_IsSync 1
109#define R1BIO_Degraded 2
110#endif