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1da177e4 LT |
1 | #ifndef _RAID10_H |
2 | #define _RAID10_H | |
3 | ||
4 | #include <linux/raid/md.h> | |
5 | ||
6 | typedef struct mirror_info mirror_info_t; | |
7 | ||
8 | struct mirror_info { | |
9 | mdk_rdev_t *rdev; | |
10 | sector_t head_position; | |
11 | }; | |
12 | ||
13 | typedef struct r10bio_s r10bio_t; | |
14 | ||
15 | struct r10_private_data_s { | |
16 | mddev_t *mddev; | |
17 | mirror_info_t *mirrors; | |
18 | int raid_disks; | |
19 | int working_disks; | |
20 | spinlock_t device_lock; | |
21 | ||
22 | /* geometry */ | |
23 | int near_copies; /* number of copies layed out raid0 style */ | |
24 | int far_copies; /* number of copies layed out | |
25 | * at large strides across drives | |
26 | */ | |
27 | int copies; /* near_copies * far_copies. | |
28 | * must be <= raid_disks | |
29 | */ | |
30 | sector_t stride; /* distance between far copies. | |
31 | * This is size / far_copies | |
32 | */ | |
33 | ||
34 | int chunk_shift; /* shift from chunks to sectors */ | |
35 | sector_t chunk_mask; | |
36 | ||
37 | struct list_head retry_list; | |
38 | /* for use when syncing mirrors: */ | |
39 | ||
40 | spinlock_t resync_lock; | |
41 | int nr_pending; | |
0a27ec96 | 42 | int nr_waiting; |
1da177e4 LT |
43 | int barrier; |
44 | sector_t next_resync; | |
45 | ||
0a27ec96 | 46 | wait_queue_head_t wait_barrier; |
1da177e4 LT |
47 | |
48 | mempool_t *r10bio_pool; | |
49 | mempool_t *r10buf_pool; | |
50 | }; | |
51 | ||
52 | typedef struct r10_private_data_s conf_t; | |
53 | ||
54 | /* | |
55 | * this is the only point in the RAID code where we violate | |
56 | * C type safety. mddev->private is an 'opaque' pointer. | |
57 | */ | |
58 | #define mddev_to_conf(mddev) ((conf_t *) mddev->private) | |
59 | ||
60 | /* | |
61 | * this is our 'private' RAID10 bio. | |
62 | * | |
63 | * it contains information about what kind of IO operations were started | |
64 | * for this RAID10 operation, and about their status: | |
65 | */ | |
66 | ||
67 | struct r10bio_s { | |
68 | atomic_t remaining; /* 'have we finished' count, | |
69 | * used from IRQ handlers | |
70 | */ | |
71 | sector_t sector; /* virtual sector number */ | |
72 | int sectors; | |
73 | unsigned long state; | |
74 | mddev_t *mddev; | |
75 | /* | |
76 | * original bio going to /dev/mdx | |
77 | */ | |
78 | struct bio *master_bio; | |
79 | /* | |
80 | * if the IO is in READ direction, then this is where we read | |
81 | */ | |
82 | int read_slot; | |
83 | ||
84 | struct list_head retry_list; | |
85 | /* | |
86 | * if the IO is in WRITE direction, then multiple bios are used, | |
87 | * one for each copy. | |
88 | * When resyncing we also use one for each copy. | |
89 | * When reconstructing, we use 2 bios, one for read, one for write. | |
90 | * We choose the number when they are allocated. | |
91 | */ | |
92 | struct { | |
93 | struct bio *bio; | |
94 | sector_t addr; | |
95 | int devnum; | |
96 | } devs[0]; | |
97 | }; | |
98 | ||
99 | /* bits for r10bio.state */ | |
100 | #define R10BIO_Uptodate 0 | |
101 | #define R10BIO_IsSync 1 | |
102 | #define R10BIO_IsRecover 2 | |
103 | #endif |