| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
| 42 | int barrier; |
| 43 | sector_t next_resync; |
| 44 | |
| 45 | wait_queue_head_t wait_idle; |
| 46 | wait_queue_head_t wait_resume; |
| 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 |