Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _RAID1_H |
| 2 | #define _RAID1_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 | /* |
| 14 | * memory pools need a pointer to the mddev, so they can force an unplug |
| 15 | * when memory is tight, and a count of the number of drives that the |
| 16 | * pool was allocated for, so they know how much to allocate and free. |
| 17 | * mddev->raid_disks cannot be used, as it can change while a pool is active |
| 18 | * These two datums are stored in a kmalloced struct. |
| 19 | */ |
| 20 | |
| 21 | struct pool_info { |
| 22 | mddev_t *mddev; |
| 23 | int raid_disks; |
| 24 | }; |
| 25 | |
| 26 | |
| 27 | typedef struct r1bio_s r1bio_t; |
| 28 | |
| 29 | struct r1_private_data_s { |
| 30 | mddev_t *mddev; |
| 31 | mirror_info_t *mirrors; |
| 32 | int raid_disks; |
| 33 | int working_disks; |
| 34 | int last_used; |
| 35 | sector_t next_seq_sect; |
| 36 | spinlock_t device_lock; |
| 37 | |
| 38 | struct list_head retry_list; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 39 | /* queue pending writes and submit them on unplug */ |
| 40 | struct bio_list pending_bio_list; |
| 41 | /* queue of writes that have been unplugged */ |
| 42 | struct bio_list flushing_bio_list; |
| 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | /* for use when syncing mirrors: */ |
| 45 | |
| 46 | spinlock_t resync_lock; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 47 | int nr_pending; |
NeilBrown | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 48 | int nr_waiting; |
NeilBrown | ddaf22a | 2006-01-06 00:20:19 -0800 | [diff] [blame] | 49 | int nr_queued; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 50 | int barrier; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | sector_t next_resync; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [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 | 17999be | 2006-01-06 00:20:12 -0800 | [diff] [blame] | 57 | wait_queue_head_t wait_barrier; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
| 59 | struct pool_info *poolinfo; |
| 60 | |
NeilBrown | ddaf22a | 2006-01-06 00:20:19 -0800 | [diff] [blame] | 61 | struct page *tmppage; |
| 62 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | mempool_t *r1bio_pool; |
| 64 | mempool_t *r1buf_pool; |
| 65 | }; |
| 66 | |
| 67 | typedef struct r1_private_data_s conf_t; |
| 68 | |
| 69 | /* |
| 70 | * this is the only point in the RAID code where we violate |
| 71 | * C type safety. mddev->private is an 'opaque' pointer. |
| 72 | */ |
| 73 | #define mddev_to_conf(mddev) ((conf_t *) mddev->private) |
| 74 | |
| 75 | /* |
| 76 | * this is our 'private' RAID1 bio. |
| 77 | * |
| 78 | * it contains information about what kind of IO operations were started |
| 79 | * for this RAID1 operation, and about their status: |
| 80 | */ |
| 81 | |
| 82 | struct r1bio_s { |
| 83 | atomic_t remaining; /* 'have we finished' count, |
| 84 | * used from IRQ handlers |
| 85 | */ |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 86 | atomic_t behind_remaining; /* number of write-behind ios remaining |
| 87 | * in this BehindIO request |
| 88 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | sector_t sector; |
| 90 | int sectors; |
| 91 | unsigned long state; |
| 92 | mddev_t *mddev; |
| 93 | /* |
| 94 | * original bio going to /dev/mdx |
| 95 | */ |
| 96 | struct bio *master_bio; |
| 97 | /* |
| 98 | * if the IO is in READ direction, then this is where we read |
| 99 | */ |
| 100 | int read_disk; |
| 101 | |
| 102 | struct list_head retry_list; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 103 | struct bitmap_update *bitmap_update; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | /* |
| 105 | * if the IO is in WRITE direction, then multiple bios are used. |
| 106 | * We choose the number when they are allocated. |
| 107 | */ |
| 108 | struct bio *bios[0]; |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 109 | /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | }; |
| 111 | |
NeilBrown | cf30a47 | 2006-01-06 00:20:23 -0800 | [diff] [blame] | 112 | /* when we get a read error on a read-only array, we redirect to another |
| 113 | * device without failing the first device, or trying to over-write to |
| 114 | * correct the read error. To keep track of bad blocks on a per-bio |
| 115 | * level, we store IO_BLOCKED in the appropriate 'bios' pointer |
| 116 | */ |
| 117 | #define IO_BLOCKED ((struct bio*)1) |
| 118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | /* bits for r1bio.state */ |
| 120 | #define R1BIO_Uptodate 0 |
| 121 | #define R1BIO_IsSync 1 |
NeilBrown | 191ea9b | 2005-06-21 17:17:23 -0700 | [diff] [blame] | 122 | #define R1BIO_Degraded 2 |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 123 | #define R1BIO_BehindIO 3 |
| 124 | #define R1BIO_Barrier 4 |
| 125 | #define R1BIO_BarrierRetry 5 |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 126 | /* For write-behind requests, we call bi_end_io when |
| 127 | * the last non-write-behind device completes, providing |
| 128 | * any write was successful. Otherwise we call when |
| 129 | * any write-behind write succeeds, otherwise we call |
| 130 | * with failure when last write completes (and all failed). |
| 131 | * Record that bi_end_io was called with this flag... |
| 132 | */ |
NeilBrown | 9e71f9c | 2006-03-23 02:59:22 -0800 | [diff] [blame^] | 133 | #define R1BIO_Returned 6 |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | #endif |