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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 423 | giacomo | 1 | #ifndef _RAID1_H |
| 2 | #define _RAID1_H |
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| 3 | |||
| 4 | #include <linux/raid/md.h> |
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| 5 | |||
| 6 | typedef struct mirror_info mirror_info_t; |
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| 7 | |||
| 8 | struct mirror_info { |
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| 9 | mdk_rdev_t *rdev; |
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| 10 | sector_t head_position; |
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| 11 | }; |
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| 12 | |||
| 13 | typedef struct r1bio_s r1bio_t; |
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| 14 | |||
| 15 | struct r1_private_data_s { |
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| 16 | mddev_t *mddev; |
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| 17 | mirror_info_t *mirrors; |
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| 18 | int raid_disks; |
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| 19 | int working_disks; |
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| 20 | int last_used; |
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| 21 | sector_t next_seq_sect; |
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| 22 | spinlock_t device_lock; |
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| 23 | |||
| 24 | /* for use when syncing mirrors: */ |
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| 25 | |||
| 26 | spinlock_t resync_lock; |
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| 27 | int nr_pending; |
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| 28 | int barrier; |
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| 29 | sector_t next_resync; |
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| 30 | |||
| 31 | wait_queue_head_t wait_idle; |
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| 32 | wait_queue_head_t wait_resume; |
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| 33 | |||
| 34 | mempool_t *r1bio_pool; |
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| 35 | mempool_t *r1buf_pool; |
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| 36 | }; |
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| 37 | |||
| 38 | typedef struct r1_private_data_s conf_t; |
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| 39 | |||
| 40 | /* |
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| 41 | * this is the only point in the RAID code where we violate |
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| 42 | * C type safety. mddev->private is an 'opaque' pointer. |
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| 43 | */ |
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| 44 | #define mddev_to_conf(mddev) ((conf_t *) mddev->private) |
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| 45 | |||
| 46 | /* |
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| 47 | * this is our 'private' RAID1 bio. |
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| 48 | * |
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| 49 | * it contains information about what kind of IO operations were started |
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| 50 | * for this RAID1 operation, and about their status: |
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| 51 | */ |
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| 52 | |||
| 53 | struct r1bio_s { |
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| 54 | atomic_t remaining; /* 'have we finished' count, |
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| 55 | * used from IRQ handlers |
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| 56 | */ |
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| 57 | int cmd; |
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| 58 | sector_t sector; |
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| 59 | unsigned long state; |
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| 60 | mddev_t *mddev; |
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| 61 | /* |
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| 62 | * original bio going to /dev/mdx |
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| 63 | */ |
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| 64 | struct bio *master_bio; |
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| 65 | /* |
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| 66 | * if the IO is in READ direction, then this bio is used: |
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| 67 | */ |
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| 68 | struct bio *read_bio; |
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| 69 | int read_disk; |
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| 70 | |||
| 71 | r1bio_t *next_r1; /* next for retry or in free list */ |
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| 72 | struct list_head retry_list; |
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| 73 | /* |
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| 74 | * if the IO is in WRITE direction, then multiple bios are used. |
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| 75 | * We choose the number when they are allocated. |
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| 76 | */ |
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| 77 | struct bio *write_bios[0]; |
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| 78 | }; |
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| 79 | |||
| 80 | /* bits for r1bio.state */ |
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| 81 | #define R1BIO_Uptodate 1 |
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| 82 | |||
| 83 | #endif |