1#ifndef _RAID10_H 2#define _RAID10_H 3 4struct 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 14struct 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 /* queue pending writes and submit them on unplug */ 57 struct bio_list pending_bio_list; 58 int pending_count; 59 60 spinlock_t resync_lock; 61 int nr_pending; 62 int nr_waiting; 63 int nr_queued; 64 int barrier; 65 sector_t next_resync; 66 int fullsync; /* set to 1 if a full sync is needed, 67 * (fresh device added). 68 * Cleared when a sync completes. 69 */ 70 int have_replacement; /* There is at least one 71 * replacement device. 72 */ 73 wait_queue_head_t wait_barrier; 74 75 mempool_t *r10bio_pool; 76 mempool_t *r10buf_pool; 77 struct page *tmppage; 78 79 /* When taking over an array from a different personality, we store 80 * the new thread here until we fully activate the array. 81 */ 82 struct md_thread *thread; 83}; 84 85/* 86 * this is our 'private' RAID10 bio. 87 * 88 * it contains information about what kind of IO operations were started 89 * for this RAID10 operation, and about their status: 90 */ 91 92struct r10bio { 93 atomic_t remaining; /* 'have we finished' count, 94 * used from IRQ handlers 95 */ 96 sector_t sector; /* virtual sector number */ 97 int sectors; 98 unsigned long state; 99 struct mddev *mddev; 100 /* 101 * original bio going to /dev/mdx 102 */ 103 struct bio *master_bio; 104 /* 105 * if the IO is in READ direction, then this is where we read 106 */ 107 int read_slot; 108 109 struct list_head retry_list; 110 /* 111 * if the IO is in WRITE direction, then multiple bios are used, 112 * one for each copy. 113 * When resyncing we also use one for each copy. 114 * When reconstructing, we use 2 bios, one for read, one for write. 115 * We choose the number when they are allocated. 116 * We sometimes need an extra bio to write to the replacement. 117 */ 118 struct r10dev { 119 struct bio *bio; 120 union { 121 struct bio *repl_bio; /* used for resync and 122 * writes */ 123 struct md_rdev *rdev; /* used for reads 124 * (read_slot >= 0) */ 125 }; 126 sector_t addr; 127 int devnum; 128 } devs[0]; 129}; 130 131/* bits for r10bio.state */ 132enum r10bio_state { 133 R10BIO_Uptodate, 134 R10BIO_IsSync, 135 R10BIO_IsRecover, 136 R10BIO_IsReshape, 137 R10BIO_Degraded, 138/* Set ReadError on bios that experience a read error 139 * so that raid10d knows what to do with them. 140 */ 141 R10BIO_ReadError, 142/* If a write for this request means we can clear some 143 * known-bad-block records, we set this flag. 144 */ 145 R10BIO_MadeGood, 146 R10BIO_WriteError, 147/* During a reshape we might be performing IO on the 148 * 'previous' part of the array, in which case this 149 * flag is set 150 */ 151 R10BIO_Previous, 152}; 153 154extern int md_raid10_congested(struct mddev *mddev, int bits); 155 156#endif 157