1#ifndef _RAID10_H 2#define _RAID10_H 3 4typedef struct mirror_info mirror_info_t; 5 6struct mirror_info { 7 mdk_rdev_t *rdev; 8 sector_t head_position; 9}; 10 11typedef struct r10bio_s r10bio_t; 12 13struct r10_private_data_s { 14 mddev_t *mddev; 15 mirror_info_t *mirrors; 16 int raid_disks; 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 */ 24 int far_offset; /* far_copies are offset by 1 stripe 25 * instead of many 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 unless 32 * far_offset, in which case it is 33 * 1 stripe. 34 */ 35 36 sector_t dev_sectors; /* temp copy of mddev->dev_sectors */ 37 38 int chunk_shift; /* shift from chunks to sectors */ 39 sector_t chunk_mask; 40 41 struct list_head retry_list; 42 /* queue pending writes and submit them on unplug */ 43 struct bio_list pending_bio_list; 44 45 46 spinlock_t resync_lock; 47 int nr_pending; 48 int nr_waiting; 49 int nr_queued; 50 int barrier; 51 sector_t next_resync; 52 int fullsync; /* set to 1 if a full sync is needed, 53 * (fresh device added). 54 * Cleared when a sync completes. 55 */ 56 57 wait_queue_head_t wait_barrier; 58 59 mempool_t *r10bio_pool; 60 mempool_t *r10buf_pool; 61 struct page *tmppage; 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; 67}; 68 69typedef struct r10_private_data_s conf_t; 70 71/* 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 78struct 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}; 109 110/* 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) 116 117/* bits for r10bio.state */ 118#define R10BIO_Uptodate 0 119#define R10BIO_IsSync 1 120#define R10BIO_IsRecover 2 121#define R10BIO_Degraded 3 122#endif 123