1 #ifndef _RAID1_H 2 #define _RAID1_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 /* 12 * memory pools need a pointer to the mddev, so they can force an unplug 13 * when memory is tight, and a count of the number of drives that the 14 * pool was allocated for, so they know how much to allocate and free. 15 * mddev->raid_disks cannot be used, as it can change while a pool is active 16 * These two datums are stored in a kmalloced struct. 17 */ 18 19 struct pool_info { 20 mddev_t *mddev; 21 int raid_disks; 22 }; 23 24 25 typedef struct r1bio_s r1bio_t; 26 27 struct r1_private_data_s { 28 mddev_t *mddev; 29 mirror_info_t *mirrors; 30 int raid_disks; 31 int last_used; 32 sector_t next_seq_sect; 33 spinlock_t device_lock; 34 35 struct list_head retry_list; 36 /* queue pending writes and submit them on unplug */ 37 struct bio_list pending_bio_list; 38 39 /* for use when syncing mirrors: */ 40 41 spinlock_t resync_lock; 42 int nr_pending; 43 int nr_waiting; 44 int nr_queued; 45 int barrier; 46 sector_t next_resync; 47 int fullsync; /* set to 1 if a full sync is needed, 48 * (fresh device added). 49 * Cleared when a sync completes. 50 */ 51 52 wait_queue_head_t wait_barrier; 53 54 struct pool_info *poolinfo; 55 56 struct page *tmppage; 57 58 mempool_t *r1bio_pool; 59 mempool_t *r1buf_pool; 60 61 /* When taking over an array from a different personality, we store 62 * the new thread here until we fully activate the array. 63 */ 64 struct mdk_thread_s *thread; 65 }; 66 67 typedef struct r1_private_data_s conf_t; 68 69 /* 70 * this is our 'private' RAID1 bio. 71 * 72 * it contains information about what kind of IO operations were started 73 * for this RAID1 operation, and about their status: 74 */ 75 76 struct r1bio_s { 77 atomic_t remaining; /* 'have we finished' count, 78 * used from IRQ handlers 79 */ 80 atomic_t behind_remaining; /* number of write-behind ios remaining 81 * in this BehindIO request 82 */ 83 sector_t sector; 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_disk; 95 96 struct list_head retry_list; 97 struct bitmap_update *bitmap_update; 98 /* 99 * if the IO is in WRITE direction, then multiple bios are used. 100 * We choose the number when they are allocated. 101 */ 102 struct bio *bios[0]; 103 /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/ 104 }; 105 106 /* when we get a read error on a read-only array, we redirect to another 107 * device without failing the first device, or trying to over-write to 108 * correct the read error. To keep track of bad blocks on a per-bio 109 * level, we store IO_BLOCKED in the appropriate 'bios' pointer 110 */ 111 #define IO_BLOCKED ((struct bio*)1) 112 113 /* bits for r1bio.state */ 114 #define R1BIO_Uptodate 0 115 #define R1BIO_IsSync 1 116 #define R1BIO_Degraded 2 117 #define R1BIO_BehindIO 3 118 /* For write-behind requests, we call bi_end_io when 119 * the last non-write-behind device completes, providing 120 * any write was successful. Otherwise we call when 121 * any write-behind write succeeds, otherwise we call 122 * with failure when last write completes (and all failed). 123 * Record that bi_end_io was called with this flag... 124 */ 125 #define R1BIO_Returned 6 126 127 #endif 128