| 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; |
| 39 | /* for use when syncing mirrors: */ |
| 40 | |
| 41 | spinlock_t resync_lock; |
| 42 | int nr_pending; |
| 43 | int barrier; |
| 44 | sector_t next_resync; |
| 45 | |
| 46 | wait_queue_head_t wait_idle; |
| 47 | wait_queue_head_t wait_resume; |
| 48 | |
| 49 | struct pool_info *poolinfo; |
| 50 | |
| 51 | mempool_t *r1bio_pool; |
| 52 | mempool_t *r1buf_pool; |
| 53 | }; |
| 54 | |
| 55 | typedef struct r1_private_data_s conf_t; |
| 56 | |
| 57 | /* |
| 58 | * this is the only point in the RAID code where we violate |
| 59 | * C type safety. mddev->private is an 'opaque' pointer. |
| 60 | */ |
| 61 | #define mddev_to_conf(mddev) ((conf_t *) mddev->private) |
| 62 | |
| 63 | /* |
| 64 | * this is our 'private' RAID1 bio. |
| 65 | * |
| 66 | * it contains information about what kind of IO operations were started |
| 67 | * for this RAID1 operation, and about their status: |
| 68 | */ |
| 69 | |
| 70 | struct r1bio_s { |
| 71 | atomic_t remaining; /* 'have we finished' count, |
| 72 | * used from IRQ handlers |
| 73 | */ |
| 74 | sector_t sector; |
| 75 | int sectors; |
| 76 | unsigned long state; |
| 77 | mddev_t *mddev; |
| 78 | /* |
| 79 | * original bio going to /dev/mdx |
| 80 | */ |
| 81 | struct bio *master_bio; |
| 82 | /* |
| 83 | * if the IO is in READ direction, then this is where we read |
| 84 | */ |
| 85 | int read_disk; |
| 86 | |
| 87 | struct list_head retry_list; |
| 88 | /* |
| 89 | * if the IO is in WRITE direction, then multiple bios are used. |
| 90 | * We choose the number when they are allocated. |
| 91 | */ |
| 92 | struct bio *bios[0]; |
| 93 | }; |
| 94 | |
| 95 | /* bits for r1bio.state */ |
| 96 | #define R1BIO_Uptodate 0 |
| 97 | #define R1BIO_IsSync 1 |
| 98 | #endif |