4 #include <linux/raid/md.h>
6 typedef struct mirror_info mirror_info_t;
10 sector_t head_position;
13 typedef struct r10bio_s r10bio_t;
15 struct r10_private_data_s {
17 mirror_info_t *mirrors;
20 spinlock_t device_lock;
23 int near_copies; /* number of copies layed out raid0 style */
24 int far_copies; /* number of copies layed out
25 * at large strides across drives
27 int copies; /* near_copies * far_copies.
28 * must be <= raid_disks
30 sector_t stride; /* distance between far copies.
31 * This is size / far_copies
34 int chunk_shift; /* shift from chunks to sectors */
37 struct list_head retry_list;
38 /* queue pending writes and submit them on unplug */
39 struct bio_list pending_bio_list;
42 spinlock_t resync_lock;
47 int fullsync; /* set to 1 if a full sync is needed,
48 * (fresh device added).
49 * Cleared when a sync completes.
52 wait_queue_head_t wait_barrier;
54 mempool_t *r10bio_pool;
55 mempool_t *r10buf_pool;
58 typedef struct r10_private_data_s conf_t;
61 * this is the only point in the RAID code where we violate
62 * C type safety. mddev->private is an 'opaque' pointer.
64 #define mddev_to_conf(mddev) ((conf_t *) mddev->private)
67 * this is our 'private' RAID10 bio.
69 * it contains information about what kind of IO operations were started
70 * for this RAID10 operation, and about their status:
74 atomic_t remaining; /* 'have we finished' count,
75 * used from IRQ handlers
77 sector_t sector; /* virtual sector number */
82 * original bio going to /dev/mdx
84 struct bio *master_bio;
86 * if the IO is in READ direction, then this is where we read
90 struct list_head retry_list;
92 * if the IO is in WRITE direction, then multiple bios are used,
94 * When resyncing we also use one for each copy.
95 * When reconstructing, we use 2 bios, one for read, one for write.
96 * We choose the number when they are allocated.
105 /* bits for r10bio.state */
106 #define R10BIO_Uptodate 0
107 #define R10BIO_IsSync 1
108 #define R10BIO_IsRecover 2
109 #define R10BIO_Degraded 3