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20#ifndef __BTRFS_RAID56__
21#define __BTRFS_RAID56__
22static inline int nr_parity_stripes(struct map_lookup *map)
23{
24 if (map->type & BTRFS_BLOCK_GROUP_RAID5)
25 return 1;
26 else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
27 return 2;
28 else
29 return 0;
30}
31
32static inline int nr_data_stripes(struct map_lookup *map)
33{
34 return map->num_stripes - nr_parity_stripes(map);
35}
36#define RAID5_P_STRIPE ((u64)-2)
37#define RAID6_Q_STRIPE ((u64)-1)
38
39#define is_parity_stripe(x) (((x) == RAID5_P_STRIPE) || \
40 ((x) == RAID6_Q_STRIPE))
41
42struct btrfs_raid_bio;
43struct btrfs_device;
44
45int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
46 struct btrfs_bio *bbio, u64 stripe_len,
47 int mirror_num, int generic_io);
48int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
49 struct btrfs_bio *bbio, u64 stripe_len);
50
51void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page,
52 u64 logical);
53
54struct btrfs_raid_bio *
55raid56_parity_alloc_scrub_rbio(struct btrfs_root *root, struct bio *bio,
56 struct btrfs_bio *bbio, u64 stripe_len,
57 struct btrfs_device *scrub_dev,
58 unsigned long *dbitmap, int stripe_nsectors);
59void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);
60
61struct btrfs_raid_bio *
62raid56_alloc_missing_rbio(struct btrfs_root *root, struct bio *bio,
63 struct btrfs_bio *bbio, u64 length);
64void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio);
65
66int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
67void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
68#endif
69