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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _RAID10_H
2#define _RAID10_H
3
Linus Torvalds1da177e2005-04-16 15:20:36 -07004typedef struct mirror_info mirror_info_t;
5
6struct mirror_info {
7 mdk_rdev_t *rdev;
8 sector_t head_position;
9};
10
11typedef struct r10bio_s r10bio_t;
12
13struct r10_private_data_s {
14 mddev_t *mddev;
15 mirror_info_t *mirrors;
16 int raid_disks;
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 spinlock_t device_lock;
18
19 /* geometry */
20 int near_copies; /* number of copies layed out raid0 style */
21 int far_copies; /* number of copies layed out
22 * at large strides across drives
23 */
NeilBrownc93983b2006-06-26 00:27:41 -070024 int far_offset; /* far_copies are offset by 1 stripe
25 * instead of many
26 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 int copies; /* near_copies * far_copies.
28 * must be <= raid_disks
29 */
30 sector_t stride; /* distance between far copies.
NeilBrownc93983b2006-06-26 00:27:41 -070031 * This is size / far_copies unless
32 * far_offset, in which case it is
33 * 1 stripe.
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 */
35
Trela, Maciejdab8b292010-03-08 16:02:45 +110036 sector_t dev_sectors; /* temp copy of mddev->dev_sectors */
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 int chunk_shift; /* shift from chunks to sectors */
39 sector_t chunk_mask;
40
41 struct list_head retry_list;
NeilBrown6cce3b22006-01-06 00:20:16 -080042 /* queue pending writes and submit them on unplug */
43 struct bio_list pending_bio_list;
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46 spinlock_t resync_lock;
47 int nr_pending;
NeilBrown0a27ec92006-01-06 00:20:13 -080048 int nr_waiting;
NeilBrown4443ae12006-01-06 00:20:28 -080049 int nr_queued;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 int barrier;
51 sector_t next_resync;
NeilBrown6cce3b22006-01-06 00:20:16 -080052 int fullsync; /* set to 1 if a full sync is needed,
53 * (fresh device added).
54 * Cleared when a sync completes.
55 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
NeilBrown0a27ec92006-01-06 00:20:13 -080057 wait_queue_head_t wait_barrier;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59 mempool_t *r10bio_pool;
60 mempool_t *r10buf_pool;
NeilBrown4443ae12006-01-06 00:20:28 -080061 struct page *tmppage;
Trela, Maciejdab8b292010-03-08 16:02:45 +110062
63 /* When taking over an array from a different personality, we store
64 * the new thread here until we fully activate the array.
65 */
66 struct mdk_thread_s *thread;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067};
68
69typedef struct r10_private_data_s conf_t;
70
71/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 * this is our 'private' RAID10 bio.
73 *
74 * it contains information about what kind of IO operations were started
75 * for this RAID10 operation, and about their status:
76 */
77
78struct r10bio_s {
79 atomic_t remaining; /* 'have we finished' count,
80 * used from IRQ handlers
81 */
82 sector_t sector; /* virtual sector number */
83 int sectors;
84 unsigned long state;
85 mddev_t *mddev;
86 /*
87 * original bio going to /dev/mdx
88 */
89 struct bio *master_bio;
90 /*
91 * if the IO is in READ direction, then this is where we read
92 */
93 int read_slot;
94
95 struct list_head retry_list;
96 /*
97 * if the IO is in WRITE direction, then multiple bios are used,
98 * one for each copy.
99 * When resyncing we also use one for each copy.
100 * When reconstructing, we use 2 bios, one for read, one for write.
101 * We choose the number when they are allocated.
102 */
103 struct {
104 struct bio *bio;
105 sector_t addr;
106 int devnum;
107 } devs[0];
108};
109
NeilBrown0eb3ff12006-01-06 00:20:29 -0800110/* when we get a read error on a read-only array, we redirect to another
111 * device without failing the first device, or trying to over-write to
112 * correct the read error. To keep track of bad blocks on a per-bio
113 * level, we store IO_BLOCKED in the appropriate 'bios' pointer
114 */
115#define IO_BLOCKED ((struct bio*)1)
116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117/* bits for r10bio.state */
118#define R10BIO_Uptodate 0
119#define R10BIO_IsSync 1
120#define R10BIO_IsRecover 2
NeilBrown6cce3b22006-01-06 00:20:16 -0800121#define R10BIO_Degraded 3
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122#endif