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 64 typedef struct r1_private_data_s conf_t; 65 66 /* 67 * this is the only point in the RAID code where we violate 68 * C type safety. mddev->private is an 'opaque' pointer. 69 */ 70 #define mddev_to_conf(mddev) ((conf_t *) mddev->private) 71 72 /* 73 * this is our 'private' RAID1 bio. 74 * 75 * it contains information about what kind of IO operations were started 76 * for this RAID1 operation, and about their status: 77 */ 78 79 struct r1bio_s { 80 atomic_t remaining; /* 'have we finished' count, 81 * used from IRQ handlers 82 */ 83 atomic_t behind_remaining; /* number of write-behind ios remaining 84 * in this BehindIO request 85 */ 86 sector_t sector; 87 int sectors; 88 unsigned long state; 89 mddev_t *mddev; 90 /* 91 * original bio going to /dev/mdx 92 */ 93 struct bio *master_bio; 94 /* 95 * if the IO is in READ direction, then this is where we read 96 */ 97 int read_disk; 98 99 struct list_head retry_list; 100 struct bitmap_update *bitmap_update; 101 /* 102 * if the IO is in WRITE direction, then multiple bios are used. 103 * We choose the number when they are allocated. 104 */ 105 struct bio *bios[0]; 106 /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/ 107 }; 108 109 /* when we get a read error on a read-only array, we redirect to another 110 * device without failing the first device, or trying to over-write to 111 * correct the read error. To keep track of bad blocks on a per-bio 112 * level, we store IO_BLOCKED in the appropriate 'bios' pointer 113 */ 114 #define IO_BLOCKED ((struct bio*)1) 115 116 /* bits for r1bio.state */ 117 #define R1BIO_Uptodate 0 118 #define R1BIO_IsSync 1 119 #define R1BIO_Degraded 2 120 #define R1BIO_BehindIO 3 121 #define R1BIO_Barrier 4 122 #define R1BIO_BarrierRetry 5 123 /* For write-behind requests, we call bi_end_io when 124 * the last non-write-behind device completes, providing 125 * any write was successful. Otherwise we call when 126 * any write-behind write succeeds, otherwise we call 127 * with failure when last write completes (and all failed). 128 * Record that bi_end_io was called with this flag... 129 */ 130 #define R1BIO_Returned 6 131 132 #endif 133