1 #ifndef _RAID10_H 2 #define _RAID10_H 3 4 struct raid10_info { 5 struct md_rdev *rdev, *replacement; 6 sector_t head_position; 7 int recovery_disabled; /* matches 8 * mddev->recovery_disabled 9 * when we shouldn't try 10 * recovering this device. 11 */ 12 }; 13 14 struct r10conf { 15 struct mddev *mddev; 16 struct raid10_info *mirrors; 17 struct raid10_info *mirrors_new, *mirrors_old; 18 spinlock_t device_lock; 19 20 /* geometry */ 21 struct geom { 22 int raid_disks; 23 int near_copies; /* number of copies laid out 24 * raid0 style */ 25 int far_copies; /* number of copies laid out 26 * at large strides across drives 27 */ 28 int far_offset; /* far_copies are offset by 1 29 * stripe instead of many 30 */ 31 sector_t stride; /* distance between far copies. 32 * This is size / far_copies unless 33 * far_offset, in which case it is 34 * 1 stripe. 35 */ 36 int far_set_size; /* The number of devices in a set, 37 * where a 'set' are devices that 38 * contain far/offset copies of 39 * each other. 40 */ 41 int chunk_shift; /* shift from chunks to sectors */ 42 sector_t chunk_mask; 43 } prev, geo; 44 int copies; /* near_copies * far_copies. 45 * must be <= raid_disks 46 */ 47 48 sector_t dev_sectors; /* temp copy of 49 * mddev->dev_sectors */ 50 sector_t reshape_progress; 51 sector_t reshape_safe; 52 unsigned long reshape_checkpoint; 53 sector_t offset_diff; 54 55 struct list_head retry_list; 56 /* A separate list of r1bio which just need raid_end_bio_io called. 57 * This mustn't happen for writes which had any errors if the superblock 58 * needs to be written. 59 */ 60 struct list_head bio_end_io_list; 61 62 /* queue pending writes and submit them on unplug */ 63 struct bio_list pending_bio_list; 64 int pending_count; 65 66 spinlock_t resync_lock; 67 atomic_t nr_pending; 68 int nr_waiting; 69 int nr_queued; 70 int barrier; 71 int array_freeze_pending; 72 sector_t next_resync; 73 int fullsync; /* set to 1 if a full sync is needed, 74 * (fresh device added). 75 * Cleared when a sync completes. 76 */ 77 int have_replacement; /* There is at least one 78 * replacement device. 79 */ 80 wait_queue_head_t wait_barrier; 81 82 mempool_t *r10bio_pool; 83 mempool_t *r10buf_pool; 84 struct page *tmppage; 85 86 /* When taking over an array from a different personality, we store 87 * the new thread here until we fully activate the array. 88 */ 89 struct md_thread *thread; 90 }; 91 92 /* 93 * this is our 'private' RAID10 bio. 94 * 95 * it contains information about what kind of IO operations were started 96 * for this RAID10 operation, and about their status: 97 */ 98 99 struct r10bio { 100 atomic_t remaining; /* 'have we finished' count, 101 * used from IRQ handlers 102 */ 103 sector_t sector; /* virtual sector number */ 104 int sectors; 105 unsigned long state; 106 struct mddev *mddev; 107 /* 108 * original bio going to /dev/mdx 109 */ 110 struct bio *master_bio; 111 /* 112 * if the IO is in READ direction, then this is where we read 113 */ 114 int read_slot; 115 116 struct list_head retry_list; 117 /* 118 * if the IO is in WRITE direction, then multiple bios are used, 119 * one for each copy. 120 * When resyncing we also use one for each copy. 121 * When reconstructing, we use 2 bios, one for read, one for write. 122 * We choose the number when they are allocated. 123 * We sometimes need an extra bio to write to the replacement. 124 */ 125 struct r10dev { 126 struct bio *bio; 127 union { 128 struct bio *repl_bio; /* used for resync and 129 * writes */ 130 struct md_rdev *rdev; /* used for reads 131 * (read_slot >= 0) */ 132 }; 133 sector_t addr; 134 int devnum; 135 } devs[0]; 136 }; 137 138 /* bits for r10bio.state */ 139 enum r10bio_state { 140 R10BIO_Uptodate, 141 R10BIO_IsSync, 142 R10BIO_IsRecover, 143 R10BIO_IsReshape, 144 R10BIO_Degraded, 145 /* Set ReadError on bios that experience a read error 146 * so that raid10d knows what to do with them. 147 */ 148 R10BIO_ReadError, 149 /* If a write for this request means we can clear some 150 * known-bad-block records, we set this flag. 151 */ 152 R10BIO_MadeGood, 153 R10BIO_WriteError, 154 /* During a reshape we might be performing IO on the 155 * 'previous' part of the array, in which case this 156 * flag is set 157 */ 158 R10BIO_Previous, 159 }; 160 #endif 161