Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1#ifndef _RAID1_H
2#define _RAID1_H
3
4typedef struct mirror_info mirror_info_t;
5
6struct mirror_info {
7 mdk_rdev_t *rdev;
8 sector_t head_position;
9};
10
11/*
12 * memory pools need a pointer to the mddev, so they can force an unplug
13 * when memory is tight, and a count of the number of drives that the
14 * pool was allocated for, so they know how much to allocate and free.
15 * mddev->raid_disks cannot be used, as it can change while a pool is active
16 * These two datums are stored in a kmalloced struct.
17 */
18
19struct pool_info {
20 mddev_t *mddev;
21 int raid_disks;
22};
23
24
25typedef struct r1bio_s r1bio_t;
26
27struct r1_private_data_s {
28 mddev_t *mddev;
29 mirror_info_t *mirrors;
30 int raid_disks;
31 int last_used;
32 sector_t next_seq_sect;
33 spinlock_t device_lock;
34
35 struct list_head retry_list;
36 /* queue pending writes and submit them on unplug */
37 struct bio_list pending_bio_list;
38 /* queue of writes that have been unplugged */
39 struct bio_list flushing_bio_list;
40
41 /* for use when syncing mirrors: */
42
43 spinlock_t resync_lock;
44 int nr_pending;
45 int nr_waiting;
46 int nr_queued;
47 int barrier;
48 sector_t next_resync;
49 int fullsync; /* set to 1 if a full sync is needed,
50 * (fresh device added).
51 * Cleared when a sync completes.
52 */
53
54 wait_queue_head_t wait_barrier;
55
56 struct pool_info *poolinfo;
57
58 struct page *tmppage;
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 our 'private' RAID1 bio.
68 *
69 * it contains information about what kind of IO operations were started
70 * for this RAID1 operation, and about their status:
71 */
72
73struct r1bio_s {
74 atomic_t remaining; /* 'have we finished' count,
75 * used from IRQ handlers
76 */
77 atomic_t behind_remaining; /* number of write-behind ios remaining
78 * in this BehindIO request
79 */
80 sector_t sector;
81 int sectors;
82 unsigned long state;
83 mddev_t *mddev;
84 /*
85 * original bio going to /dev/mdx
86 */
87 struct bio *master_bio;
88 /*
89 * if the IO is in READ direction, then this is where we read
90 */
91 int read_disk;
92
93 struct list_head retry_list;
94 struct bitmap_update *bitmap_update;
95 /*
96 * if the IO is in WRITE direction, then multiple bios are used.
97 * We choose the number when they are allocated.
98 */
99 struct bio *bios[0];
100 /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
101};
102
103/* when we get a read error on a read-only array, we redirect to another
104 * device without failing the first device, or trying to over-write to
105 * correct the read error. To keep track of bad blocks on a per-bio
106 * level, we store IO_BLOCKED in the appropriate 'bios' pointer
107 */
108#define IO_BLOCKED ((struct bio*)1)
109
110/* bits for r1bio.state */
111#define R1BIO_Uptodate 0
112#define R1BIO_IsSync 1
113#define R1BIO_Degraded 2
114#define R1BIO_BehindIO 3
115#define R1BIO_Barrier 4
116#define R1BIO_BarrierRetry 5
117/* For write-behind requests, we call bi_end_io when
118 * the last non-write-behind device completes, providing
119 * any write was successful. Otherwise we call when
120 * any write-behind write succeeds, otherwise we call
121 * with failure when last write completes (and all failed).
122 * Record that bi_end_io was called with this flag...
123 */
124#define R1BIO_Returned 6
125
126#endif