| 1 | #ifndef _RAID1_H |
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| 2 | #define _RAID1_H |
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| 3 | |
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| 4 | #include <linux/raid/md.h> |
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| 5 | |
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| 6 | typedef struct mirror_info mirror_info_t; |
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| 7 | |
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| 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 | |
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| 13 | /* |
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| 14 | * memory pools need a pointer to the mddev, so they can force an unplug |
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| 15 | * when memory is tight, and a count of the number of drives that the |
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| 16 | * pool was allocated for, so they know how much to allocate and free. |
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| 17 | * mddev->raid_disks cannot be used, as it can change while a pool is active |
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| 18 | * These two datums are stored in a kmalloced struct. |
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| 19 | */ |
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| 20 | |
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| 21 | struct pool_info { |
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| 22 | mddev_t *mddev; |
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| 23 | int raid_disks; |
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| 24 | }; |
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| 25 | |
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| 26 | |
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| 27 | typedef struct r1bio_s r1bio_t; |
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| 28 | |
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| 29 | struct r1_private_data_s { |
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| 30 | mddev_t *mddev; |
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| 31 | mirror_info_t *mirrors; |
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| 32 | int raid_disks; |
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| 33 | int working_disks; |
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| 34 | int last_used; |
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| 35 | sector_t next_seq_sect; |
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| 36 | spinlock_t device_lock; |
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| 37 | |
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| 38 | struct list_head retry_list; |
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| 39 | /* for use when syncing mirrors: */ |
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| 40 | |
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| 41 | spinlock_t resync_lock; |
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| 42 | int nr_pending; |
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| 43 | int barrier; |
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| 44 | sector_t next_resync; |
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| 45 | |
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| 46 | wait_queue_head_t wait_idle; |
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| 47 | wait_queue_head_t wait_resume; |
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| 48 | |
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| 49 | struct pool_info *poolinfo; |
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| 50 | |
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| 51 | mempool_t *r1bio_pool; |
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| 52 | mempool_t *r1buf_pool; |
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| 53 | }; |
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| 54 | |
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| 55 | typedef struct r1_private_data_s conf_t; |
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| 56 | |
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| 57 | /* |
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| 58 | * this is the only point in the RAID code where we violate |
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| 59 | * C type safety. mddev->private is an 'opaque' pointer. |
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| 60 | */ |
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| 61 | #define mddev_to_conf(mddev) ((conf_t *) mddev->private) |
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| 62 | |
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| 63 | /* |
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| 64 | * this is our 'private' RAID1 bio. |
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| 65 | * |
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| 66 | * it contains information about what kind of IO operations were started |
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| 67 | * for this RAID1 operation, and about their status: |
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| 68 | */ |
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| 69 | |
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| 70 | struct r1bio_s { |
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| 71 | atomic_t remaining; /* 'have we finished' count, |
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| 72 | * used from IRQ handlers |
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| 73 | */ |
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| 74 | sector_t sector; |
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| 75 | int sectors; |
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| 76 | unsigned long state; |
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| 77 | mddev_t *mddev; |
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| 78 | /* |
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| 79 | * original bio going to /dev/mdx |
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| 80 | */ |
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| 81 | struct bio *master_bio; |
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| 82 | /* |
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| 83 | * if the IO is in READ direction, then this is where we read |
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| 84 | */ |
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| 85 | int read_disk; |
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| 86 | |
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| 87 | struct list_head retry_list; |
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| 88 | /* |
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| 89 | * if the IO is in WRITE direction, then multiple bios are used. |
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| 90 | * We choose the number when they are allocated. |
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| 91 | */ |
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| 92 | struct bio *bios[0]; |
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| 93 | }; |
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| 94 | |
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| 95 | /* bits for r1bio.state */ |
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| 96 | #define R1BIO_Uptodate 0 |
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| 97 | #define R1BIO_IsSync 1 |
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| 98 | #endif |
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