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 int recovery_disabled; /* matches 10 * mddev->recovery_disabled 11 * when we shouldn't try 12 * recovering this device. 13 */ 14 }; 15 16 typedef struct r10bio_s r10bio_t; 17 18 struct r10_private_data_s { 19 mddev_t *mddev; 20 mirror_info_t *mirrors; 21 int raid_disks; 22 spinlock_t device_lock; 23 24 /* geometry */ 25 int near_copies; /* number of copies laid out raid0 style */ 26 int far_copies; /* number of copies laid out 27 * at large strides across drives 28 */ 29 int far_offset; /* far_copies are offset by 1 stripe 30 * instead of many 31 */ 32 int copies; /* near_copies * far_copies. 33 * must be <= raid_disks 34 */ 35 sector_t stride; /* distance between far copies. 36 * This is size / far_copies unless 37 * far_offset, in which case it is 38 * 1 stripe. 39 */ 40 41 sector_t dev_sectors; /* temp copy of mddev->dev_sectors */ 42 43 int chunk_shift; /* shift from chunks to sectors */ 44 sector_t chunk_mask; 45 46 struct list_head retry_list; 47 /* queue pending writes and submit them on unplug */ 48 struct bio_list pending_bio_list; 49 50 51 spinlock_t resync_lock; 52 int nr_pending; 53 int nr_waiting; 54 int nr_queued; 55 int barrier; 56 sector_t next_resync; 57 int fullsync; /* set to 1 if a full sync is needed, 58 * (fresh device added). 59 * Cleared when a sync completes. 60 */ 61 62 wait_queue_head_t wait_barrier; 63 64 mempool_t *r10bio_pool; 65 mempool_t *r10buf_pool; 66 struct page *tmppage; 67 68 /* When taking over an array from a different personality, we store 69 * the new thread here until we fully activate the array. 70 */ 71 struct mdk_thread_s *thread; 72 }; 73 74 typedef struct r10_private_data_s conf_t; 75 76 /* 77 * this is our 'private' RAID10 bio. 78 * 79 * it contains information about what kind of IO operations were started 80 * for this RAID10 operation, and about their status: 81 */ 82 83 struct r10bio_s { 84 atomic_t remaining; /* 'have we finished' count, 85 * used from IRQ handlers 86 */ 87 sector_t sector; /* virtual sector number */ 88 int sectors; 89 unsigned long state; 90 mddev_t *mddev; 91 /* 92 * original bio going to /dev/mdx 93 */ 94 struct bio *master_bio; 95 /* 96 * if the IO is in READ direction, then this is where we read 97 */ 98 int read_slot; 99 100 struct list_head retry_list; 101 /* 102 * if the IO is in WRITE direction, then multiple bios are used, 103 * one for each copy. 104 * When resyncing we also use one for each copy. 105 * When reconstructing, we use 2 bios, one for read, one for write. 106 * We choose the number when they are allocated. 107 */ 108 struct { 109 struct bio *bio; 110 sector_t addr; 111 int devnum; 112 } devs[0]; 113 }; 114 115 /* when we get a read error on a read-only array, we redirect to another 116 * device without failing the first device, or trying to over-write to 117 * correct the read error. To keep track of bad blocks on a per-bio 118 * level, we store IO_BLOCKED in the appropriate 'bios' pointer 119 */ 120 #define IO_BLOCKED ((struct bio*)1) 121 /* When we successfully write to a known bad-block, we need to remove the 122 * bad-block marking which must be done from process context. So we record 123 * the success by setting devs[n].bio to IO_MADE_GOOD 124 */ 125 #define IO_MADE_GOOD ((struct bio *)2) 126 127 #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) 128 129 /* bits for r10bio.state */ 130 #define R10BIO_Uptodate 0 131 #define R10BIO_IsSync 1 132 #define R10BIO_IsRecover 2 133 #define R10BIO_Degraded 3 134 /* Set ReadError on bios that experience a read error 135 * so that raid10d knows what to do with them. 136 */ 137 #define R10BIO_ReadError 4 138 /* If a write for this request means we can clear some 139 * known-bad-block records, we set this flag. 140 */ 141 #define R10BIO_MadeGood 5 142 #define R10BIO_WriteError 6 143 #endif 144