Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _RAID10_H |
| 2 | #define _RAID10_H |
| 3 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
NeilBrown | c93983b | 2006-06-26 00:27:41 -0700 | [diff] [blame] | 24 | int far_offset; /* far_copies are offset by 1 stripe |
| 25 | * instead of many |
| 26 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | int copies; /* near_copies * far_copies. |
| 28 | * must be <= raid_disks |
| 29 | */ |
| 30 | sector_t stride; /* distance between far copies. |
NeilBrown | c93983b | 2006-06-26 00:27:41 -0700 | [diff] [blame] | 31 | * This is size / far_copies unless |
| 32 | * far_offset, in which case it is |
| 33 | * 1 stripe. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | */ |
| 35 | |
Trela, Maciej | dab8b29 | 2010-03-08 16:02:45 +1100 | [diff] [blame] | 36 | sector_t dev_sectors; /* temp copy of mddev->dev_sectors */ |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | int chunk_shift; /* shift from chunks to sectors */ |
| 39 | sector_t chunk_mask; |
| 40 | |
| 41 | struct list_head retry_list; |
NeilBrown | 6cce3b2 | 2006-01-06 00:20:16 -0800 | [diff] [blame] | 42 | /* queue pending writes and submit them on unplug */ |
| 43 | struct bio_list pending_bio_list; |
| 44 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | spinlock_t resync_lock; |
| 47 | int nr_pending; |
NeilBrown | 0a27ec9 | 2006-01-06 00:20:13 -0800 | [diff] [blame] | 48 | int nr_waiting; |
NeilBrown | 4443ae1 | 2006-01-06 00:20:28 -0800 | [diff] [blame] | 49 | int nr_queued; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | int barrier; |
| 51 | sector_t next_resync; |
NeilBrown | 6cce3b2 | 2006-01-06 00:20:16 -0800 | [diff] [blame] | 52 | int fullsync; /* set to 1 if a full sync is needed, |
| 53 | * (fresh device added). |
| 54 | * Cleared when a sync completes. |
| 55 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
NeilBrown | 0a27ec9 | 2006-01-06 00:20:13 -0800 | [diff] [blame] | 57 | wait_queue_head_t wait_barrier; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
| 59 | mempool_t *r10bio_pool; |
| 60 | mempool_t *r10buf_pool; |
NeilBrown | 4443ae1 | 2006-01-06 00:20:28 -0800 | [diff] [blame] | 61 | struct page *tmppage; |
Trela, Maciej | dab8b29 | 2010-03-08 16:02:45 +1100 | [diff] [blame] | 62 | |
| 63 | /* When taking over an array from a different personality, we store |
| 64 | * the new thread here until we fully activate the array. |
| 65 | */ |
| 66 | struct mdk_thread_s *thread; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | }; |
| 68 | |
| 69 | typedef struct r10_private_data_s conf_t; |
| 70 | |
| 71 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | * this is our 'private' RAID10 bio. |
| 73 | * |
| 74 | * it contains information about what kind of IO operations were started |
| 75 | * for this RAID10 operation, and about their status: |
| 76 | */ |
| 77 | |
| 78 | struct r10bio_s { |
| 79 | atomic_t remaining; /* 'have we finished' count, |
| 80 | * used from IRQ handlers |
| 81 | */ |
| 82 | sector_t sector; /* virtual sector number */ |
| 83 | int sectors; |
| 84 | unsigned long state; |
| 85 | mddev_t *mddev; |
| 86 | /* |
| 87 | * original bio going to /dev/mdx |
| 88 | */ |
| 89 | struct bio *master_bio; |
| 90 | /* |
| 91 | * if the IO is in READ direction, then this is where we read |
| 92 | */ |
| 93 | int read_slot; |
| 94 | |
| 95 | struct list_head retry_list; |
| 96 | /* |
| 97 | * if the IO is in WRITE direction, then multiple bios are used, |
| 98 | * one for each copy. |
| 99 | * When resyncing we also use one for each copy. |
| 100 | * When reconstructing, we use 2 bios, one for read, one for write. |
| 101 | * We choose the number when they are allocated. |
| 102 | */ |
| 103 | struct { |
| 104 | struct bio *bio; |
| 105 | sector_t addr; |
| 106 | int devnum; |
| 107 | } devs[0]; |
| 108 | }; |
| 109 | |
NeilBrown | 0eb3ff1 | 2006-01-06 00:20:29 -0800 | [diff] [blame] | 110 | /* when we get a read error on a read-only array, we redirect to another |
| 111 | * device without failing the first device, or trying to over-write to |
| 112 | * correct the read error. To keep track of bad blocks on a per-bio |
| 113 | * level, we store IO_BLOCKED in the appropriate 'bios' pointer |
| 114 | */ |
| 115 | #define IO_BLOCKED ((struct bio*)1) |
| 116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | /* bits for r10bio.state */ |
| 118 | #define R10BIO_Uptodate 0 |
| 119 | #define R10BIO_IsSync 1 |
| 120 | #define R10BIO_IsRecover 2 |
NeilBrown | 6cce3b2 | 2006-01-06 00:20:16 -0800 | [diff] [blame] | 121 | #define R10BIO_Degraded 3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | #endif |