1 #ifndef _RAID10_H 2 #define _RAID10_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 typedef struct r10bio_s r10bio_t; 14 15 struct r10_private_data_s { 16 mddev_t *mddev; 17 mirror_info_t *mirrors; 18 int raid_disks; 19 spinlock_t device_lock; 20 21 /* geometry */ 22 int near_copies; /* number of copies layed out raid0 style */ 23 int far_copies; /* number of copies layed out 24 * at large strides across drives 25 */ 26 int far_offset; /* far_copies are offset by 1 stripe 27 * instead of many 28 */ 29 int copies; /* near_copies * far_copies. 30 * must be <= raid_disks 31 */ 32 sector_t stride; /* distance between far copies. 33 * This is size / far_copies unless 34 * far_offset, in which case it is 35 * 1 stripe. 36 */ 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 64 typedef struct r10_private_data_s conf_t; 65 66 /* 67 * this is the only point in the RAID code where we violate 68 * C type safety. mddev->private is an 'opaque' pointer. 69 */ 70 #define mddev_to_conf(mddev) ((conf_t *) mddev->private) 71 72 /* 73 * this is our 'private' RAID10 bio. 74 * 75 * it contains information about what kind of IO operations were started 76 * for this RAID10 operation, and about their status: 77 */ 78 79 struct r10bio_s { 80 atomic_t remaining; /* 'have we finished' count, 81 * used from IRQ handlers 82 */ 83 sector_t sector; /* virtual sector number */ 84 int sectors; 85 unsigned long state; 86 mddev_t *mddev; 87 /* 88 * original bio going to /dev/mdx 89 */ 90 struct bio *master_bio; 91 /* 92 * if the IO is in READ direction, then this is where we read 93 */ 94 int read_slot; 95 96 struct list_head retry_list; 97 /* 98 * if the IO is in WRITE direction, then multiple bios are used, 99 * one for each copy. 100 * When resyncing we also use one for each copy. 101 * When reconstructing, we use 2 bios, one for read, one for write. 102 * We choose the number when they are allocated. 103 */ 104 struct { 105 struct bio *bio; 106 sector_t addr; 107 int devnum; 108 } devs[0]; 109 }; 110 111 /* when we get a read error on a read-only array, we redirect to another 112 * device without failing the first device, or trying to over-write to 113 * correct the read error. To keep track of bad blocks on a per-bio 114 * level, we store IO_BLOCKED in the appropriate 'bios' pointer 115 */ 116 #define IO_BLOCKED ((struct bio*)1) 117 118 /* bits for r10bio.state */ 119 #define R10BIO_Uptodate 0 120 #define R10BIO_IsSync 1 121 #define R10BIO_IsRecover 2 122 #define R10BIO_Degraded 3 123 #endif 124