4 typedef struct mirror_info mirror_info_t;
8 sector_t head_position;
11 typedef struct r10bio_s r10bio_t;
13 struct r10_private_data_s {
15 mirror_info_t *mirrors;
17 spinlock_t device_lock;
20 int near_copies; /* number of copies layed out raid0 style */
21 int far_copies; /* number of copies layed out
22 * at large strides across drives
24 int far_offset; /* far_copies are offset by 1 stripe
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 unless
32 * far_offset, in which case it is
36 sector_t dev_sectors; /* temp copy of mddev->dev_sectors */
38 int chunk_shift; /* shift from chunks to sectors */
41 struct list_head retry_list;
42 /* queue pending writes and submit them on unplug */
43 struct bio_list pending_bio_list;
46 spinlock_t resync_lock;
52 int fullsync; /* set to 1 if a full sync is needed,
53 * (fresh device added).
54 * Cleared when a sync completes.
57 wait_queue_head_t wait_barrier;
59 mempool_t *r10bio_pool;
60 mempool_t *r10buf_pool;
63 /* When taking over an array from a different personality, we store
64 * the new thread here until we fully activate the array.
66 struct mdk_thread_s *thread;
69 typedef struct r10_private_data_s conf_t;
72 * this is our 'private' RAID10 bio.
74 * it contains information about what kind of IO operations were started
75 * for this RAID10 operation, and about their status:
79 atomic_t remaining; /* 'have we finished' count,
80 * used from IRQ handlers
82 sector_t sector; /* virtual sector number */
87 * original bio going to /dev/mdx
89 struct bio *master_bio;
91 * if the IO is in READ direction, then this is where we read
95 struct list_head retry_list;
97 * if the IO is in WRITE direction, then multiple bios are used,
99 * When resyncing we also use one for each copy.
100 * When reconstructing, we use 2 bios, one for read, one for write.
101 * We choose the number when they are allocated.
110 /* when we get a read error on a read-only array, we redirect to another
111 * device without failing the first device, or trying to over-write to
112 * correct the read error. To keep track of bad blocks on a per-bio
113 * level, we store IO_BLOCKED in the appropriate 'bios' pointer
115 #define IO_BLOCKED ((struct bio*)1)
117 /* bits for r10bio.state */
118 #define R10BIO_Uptodate 0
119 #define R10BIO_IsSync 1
120 #define R10BIO_IsRecover 2
121 #define R10BIO_Degraded 3