4 #include <linux/raid/md.h>
6 typedef struct mirror_info mirror_info_t;
10 sector_t head_position;
14 * memory pools need a pointer to the mddev, so they can force an unplug
15 * when memory is tight, and a count of the number of drives that the
16 * pool was allocated for, so they know how much to allocate and free.
17 * mddev->raid_disks cannot be used, as it can change while a pool is active
18 * These two datums are stored in a kmalloced struct.
27 typedef struct r1bio_s r1bio_t;
29 struct r1_private_data_s {
31 mirror_info_t *mirrors;
35 sector_t next_seq_sect;
36 spinlock_t device_lock;
38 /* for use when syncing mirrors: */
40 spinlock_t resync_lock;
45 wait_queue_head_t wait_idle;
46 wait_queue_head_t wait_resume;
48 struct pool_info *poolinfo;
50 mempool_t *r1bio_pool;
51 mempool_t *r1buf_pool;
54 typedef struct r1_private_data_s conf_t;
57 * this is the only point in the RAID code where we violate
58 * C type safety. mddev->private is an 'opaque' pointer.
60 #define mddev_to_conf(mddev) ((conf_t *) mddev->private)
63 * this is our 'private' RAID1 bio.
65 * it contains information about what kind of IO operations were started
66 * for this RAID1 operation, and about their status:
70 atomic_t remaining; /* 'have we finished' count,
71 * used from IRQ handlers
78 * original bio going to /dev/mdx
80 struct bio *master_bio;
82 * if the IO is in READ direction, then this is where we read
86 struct list_head retry_list;
88 * if the IO is in WRITE direction, then multiple bios are used.
89 * We choose the number when they are allocated.
94 /* bits for r1bio.state */
95 #define R1BIO_Uptodate 0
96 #define R1BIO_IsSync 1