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1da177e4 LT |
1 | #ifndef _RAID10_H |
2 | #define _RAID10_H | |
3 | ||
1da177e4 LT |
4 | typedef struct mirror_info mirror_info_t; |
5 | ||
6 | struct mirror_info { | |
7 | mdk_rdev_t *rdev; | |
8 | sector_t head_position; | |
9 | }; | |
10 | ||
11 | typedef struct r10bio_s r10bio_t; | |
12 | ||
13 | struct r10_private_data_s { | |
14 | mddev_t *mddev; | |
15 | mirror_info_t *mirrors; | |
16 | int raid_disks; | |
1da177e4 LT |
17 | 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 | */ | |
c93983bf N |
24 | int far_offset; /* far_copies are offset by 1 stripe |
25 | * instead of many | |
26 | */ | |
1da177e4 LT |
27 | int copies; /* near_copies * far_copies. |
28 | * must be <= raid_disks | |
29 | */ | |
30 | sector_t stride; /* distance between far copies. | |
c93983bf N |
31 | * This is size / far_copies unless |
32 | * far_offset, in which case it is | |
33 | * 1 stripe. | |
1da177e4 LT |
34 | */ |
35 | ||
36 | int chunk_shift; /* shift from chunks to sectors */ | |
37 | sector_t chunk_mask; | |
38 | ||
39 | struct list_head retry_list; | |
6cce3b23 N |
40 | /* queue pending writes and submit them on unplug */ |
41 | struct bio_list pending_bio_list; | |
42 | ||
1da177e4 LT |
43 | |
44 | spinlock_t resync_lock; | |
45 | int nr_pending; | |
0a27ec96 | 46 | int nr_waiting; |
4443ae10 | 47 | int nr_queued; |
1da177e4 LT |
48 | int barrier; |
49 | sector_t next_resync; | |
6cce3b23 N |
50 | int fullsync; /* set to 1 if a full sync is needed, |
51 | * (fresh device added). | |
52 | * Cleared when a sync completes. | |
53 | */ | |
1da177e4 | 54 | |
0a27ec96 | 55 | wait_queue_head_t wait_barrier; |
1da177e4 LT |
56 | |
57 | mempool_t *r10bio_pool; | |
58 | mempool_t *r10buf_pool; | |
4443ae10 | 59 | struct page *tmppage; |
1da177e4 LT |
60 | }; |
61 | ||
62 | typedef struct r10_private_data_s conf_t; | |
63 | ||
64 | /* | |
65 | * this is the only point in the RAID code where we violate | |
66 | * C type safety. mddev->private is an 'opaque' pointer. | |
67 | */ | |
68 | #define mddev_to_conf(mddev) ((conf_t *) mddev->private) | |
69 | ||
70 | /* | |
71 | * this is our 'private' RAID10 bio. | |
72 | * | |
73 | * it contains information about what kind of IO operations were started | |
74 | * for this RAID10 operation, and about their status: | |
75 | */ | |
76 | ||
77 | struct r10bio_s { | |
78 | atomic_t remaining; /* 'have we finished' count, | |
79 | * used from IRQ handlers | |
80 | */ | |
81 | sector_t sector; /* virtual sector number */ | |
82 | int sectors; | |
83 | unsigned long state; | |
84 | mddev_t *mddev; | |
85 | /* | |
86 | * original bio going to /dev/mdx | |
87 | */ | |
88 | struct bio *master_bio; | |
89 | /* | |
90 | * if the IO is in READ direction, then this is where we read | |
91 | */ | |
92 | int read_slot; | |
93 | ||
94 | struct list_head retry_list; | |
95 | /* | |
96 | * if the IO is in WRITE direction, then multiple bios are used, | |
97 | * one for each copy. | |
98 | * When resyncing we also use one for each copy. | |
99 | * When reconstructing, we use 2 bios, one for read, one for write. | |
100 | * We choose the number when they are allocated. | |
101 | */ | |
102 | struct { | |
103 | struct bio *bio; | |
104 | sector_t addr; | |
105 | int devnum; | |
106 | } devs[0]; | |
107 | }; | |
108 | ||
0eb3ff12 N |
109 | /* when we get a read error on a read-only array, we redirect to another |
110 | * device without failing the first device, or trying to over-write to | |
111 | * correct the read error. To keep track of bad blocks on a per-bio | |
112 | * level, we store IO_BLOCKED in the appropriate 'bios' pointer | |
113 | */ | |
114 | #define IO_BLOCKED ((struct bio*)1) | |
115 | ||
1da177e4 LT |
116 | /* bits for r10bio.state */ |
117 | #define R10BIO_Uptodate 0 | |
118 | #define R10BIO_IsSync 1 | |
119 | #define R10BIO_IsRecover 2 | |
6cce3b23 | 120 | #define R10BIO_Degraded 3 |
1da177e4 | 121 | #endif |