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 nr_waiting;
49 int nr_queued;
50 int barrier;
51 sector_t next_resync;
52 int fullsync; /* set to 1 if a full sync is needed,
53 * (fresh device added).
54 * Cleared when a sync completes.
55 */
56
57 wait_queue_head_t wait_barrier;
58
59 struct pool_info *poolinfo;
60
61 struct page *tmppage;
62
63 mempool_t *r1bio_pool;
64 mempool_t *r1buf_pool;
65};
66
67typedef struct r1_private_data_s conf_t;
68
69/*
70 * this is the only point in the RAID code where we violate
71 * C type safety. mddev->private is an 'opaque' pointer.
72 */
73#define mddev_to_conf(mddev) ((conf_t *) mddev->private)
74
75/*
76 * this is our 'private' RAID1 bio.
77 *
78 * it contains information about what kind of IO operations were started
79 * for this RAID1 operation, and about their status:
80 */
81
82struct r1bio_s {
83 atomic_t remaining; /* 'have we finished' count,
84 * used from IRQ handlers
85 */
86 atomic_t behind_remaining; /* number of write-behind ios remaining
87 * in this BehindIO request
88 */
89 sector_t sector;
90 int sectors;
91 unsigned long state;
92 mddev_t *mddev;
93 /*
94 * original bio going to /dev/mdx
95 */
96 struct bio *master_bio;
97 /*
98 * if the IO is in READ direction, then this is where we read
99 */
100 int read_disk;
101
102 struct list_head retry_list;
103 struct bitmap_update *bitmap_update;
104 /*
105 * if the IO is in WRITE direction, then multiple bios are used.
106 * We choose the number when they are allocated.
107 */
108 struct bio *bios[0];
109 /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
110};
111
112/* when we get a read error on a read-only array, we redirect to another
113 * device without failing the first device, or trying to over-write to
114 * correct the read error. To keep track of bad blocks on a per-bio
115 * level, we store IO_BLOCKED in the appropriate 'bios' pointer
116 */
117#define IO_BLOCKED ((struct bio*)1)
118
119/* bits for r1bio.state */
120#define R1BIO_Uptodate 0
121#define R1BIO_IsSync 1
122#define R1BIO_Degraded 2
123#define R1BIO_BehindIO 3
124#define R1BIO_Barrier 4
125#define R1BIO_BarrierRetry 5
126/* For write-behind requests, we call bi_end_io when
127 * the last non-write-behind device completes, providing
128 * any write was successful. Otherwise we call when
129 * any write-behind write succeeds, otherwise we call
130 * with failure when last write completes (and all failed).
131 * Record that bi_end_io was called with this flag...
132 */
133#define R1BIO_Returned 4
134
135#endif