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 /* queue of writes that have been unplugged */ 39 struct bio_list flushing_bio_list; 40 41 /* for use when syncing mirrors: */ 42 43 spinlock_t resync_lock; 44 int nr_pending; 45 int nr_waiting; 46 int nr_queued; 47 int barrier; 48 sector_t next_resync; 49 int fullsync; /* set to 1 if a full sync is needed, 50 * (fresh device added). 51 * Cleared when a sync completes. 52 */ 53 54 wait_queue_head_t wait_barrier; 55 56 struct pool_info *poolinfo; 57 58 struct page *tmppage; 59 60 mempool_t *r1bio_pool; 61 mempool_t *r1buf_pool; 62 63 /* When taking over an array from a different personality, we store 64 * the new thread here until we fully activate the array. 65 */ 66 struct mdk_thread_s *thread; 67 }; 68 69 typedef struct r1_private_data_s conf_t; 70 71 /* 72 * this is our 'private' RAID1 bio. 73 * 74 * it contains information about what kind of IO operations were started 75 * for this RAID1 operation, and about their status: 76 */ 77 78 struct r1bio_s { 79 atomic_t remaining; /* 'have we finished' count, 80 * used from IRQ handlers 81 */ 82 atomic_t behind_remaining; /* number of write-behind ios remaining 83 * in this BehindIO request 84 */ 85 sector_t sector; 86 int sectors; 87 unsigned long state; 88 mddev_t *mddev; 89 /* 90 * original bio going to /dev/mdx 91 */ 92 struct bio *master_bio; 93 /* 94 * if the IO is in READ direction, then this is where we read 95 */ 96 int read_disk; 97 98 struct list_head retry_list; 99 struct bitmap_update *bitmap_update; 100 /* 101 * if the IO is in WRITE direction, then multiple bios are used. 102 * We choose the number when they are allocated. 103 */ 104 struct bio *bios[0]; 105 /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/ 106 }; 107 108 /* when we get a read error on a read-only array, we redirect to another 109 * device without failing the first device, or trying to over-write to 110 * correct the read error. To keep track of bad blocks on a per-bio 111 * level, we store IO_BLOCKED in the appropriate 'bios' pointer 112 */ 113 #define IO_BLOCKED ((struct bio*)1) 114 115 /* bits for r1bio.state */ 116 #define R1BIO_Uptodate 0 117 #define R1BIO_IsSync 1 118 #define R1BIO_Degraded 2 119 #define R1BIO_BehindIO 3 120 #define R1BIO_Barrier 4 121 #define R1BIO_BarrierRetry 5 122 /* For write-behind requests, we call bi_end_io when 123 * the last non-write-behind device completes, providing 124 * any write was successful. Otherwise we call when 125 * any write-behind write succeeds, otherwise we call 126 * with failure when last write completes (and all failed). 127 * Record that bi_end_io was called with this flag... 128 */ 129 #define R1BIO_Returned 6 130 131 #endif 132