1 #ifndef _RAID10_H 2 #define _RAID10_H 3 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; 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 int chunk_shift; /* shift from chunks to sectors */ 37 sector_t chunk_mask; 38 39 struct list_head retry_list; 40 /* queue pending writes and submit them on unplug */ 41 struct bio_list pending_bio_list; 42 43 44 spinlock_t resync_lock; 45 int nr_pending; 46 int nr_waiting; 47 int nr_queued; 48 int barrier; 49 sector_t next_resync; 50 int fullsync; /* set to 1 if a full sync is needed, 51 * (fresh device added). 52 * Cleared when a sync completes. 53 */ 54 55 wait_queue_head_t wait_barrier; 56 57 mempool_t *r10bio_pool; 58 mempool_t *r10buf_pool; 59 struct page *tmppage; 60 }; 61 62 typedef struct r10_private_data_s conf_t; 63 64 /* 65 * this is the only point in the RAID code where we violate 66 * C type safety. mddev->private is an 'opaque' pointer. 67 */ 68 #define mddev_to_conf(mddev) ((conf_t *) mddev->private) 69 70 /* 71 * this is our 'private' RAID10 bio. 72 * 73 * it contains information about what kind of IO operations were started 74 * for this RAID10 operation, and about their status: 75 */ 76 77 struct r10bio_s { 78 atomic_t remaining; /* 'have we finished' count, 79 * used from IRQ handlers 80 */ 81 sector_t sector; /* virtual sector number */ 82 int sectors; 83 unsigned long state; 84 mddev_t *mddev; 85 /* 86 * original bio going to /dev/mdx 87 */ 88 struct bio *master_bio; 89 /* 90 * if the IO is in READ direction, then this is where we read 91 */ 92 int read_slot; 93 94 struct list_head retry_list; 95 /* 96 * if the IO is in WRITE direction, then multiple bios are used, 97 * one for each copy. 98 * When resyncing we also use one for each copy. 99 * When reconstructing, we use 2 bios, one for read, one for write. 100 * We choose the number when they are allocated. 101 */ 102 struct { 103 struct bio *bio; 104 sector_t addr; 105 int devnum; 106 } devs[0]; 107 }; 108 109 /* when we get a read error on a read-only array, we redirect to another 110 * device without failing the first device, or trying to over-write to 111 * correct the read error. To keep track of bad blocks on a per-bio 112 * level, we store IO_BLOCKED in the appropriate 'bios' pointer 113 */ 114 #define IO_BLOCKED ((struct bio*)1) 115 116 /* bits for r10bio.state */ 117 #define R10BIO_Uptodate 0 118 #define R10BIO_IsSync 1 119 #define R10BIO_IsRecover 2 120 #define R10BIO_Degraded 3 121 #endif 122