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7#ifndef BTRFS_RAID56_H
8#define BTRFS_RAID56_H
9
10static inline int nr_parity_stripes(const struct map_lookup *map)
11{
12 if (map->type & BTRFS_BLOCK_GROUP_RAID5)
13 return 1;
14 else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
15 return 2;
16 else
17 return 0;
18}
19
20static inline int nr_data_stripes(const struct map_lookup *map)
21{
22 return map->num_stripes - nr_parity_stripes(map);
23}
24#define RAID5_P_STRIPE ((u64)-2)
25#define RAID6_Q_STRIPE ((u64)-1)
26
27#define is_parity_stripe(x) (((x) == RAID5_P_STRIPE) || \
28 ((x) == RAID6_Q_STRIPE))
29
30struct btrfs_raid_bio;
31struct btrfs_device;
32
33int raid56_parity_recover(struct btrfs_fs_info *fs_info, struct bio *bio,
34 struct btrfs_bio *bbio, u64 stripe_len,
35 int mirror_num, int generic_io);
36int raid56_parity_write(struct btrfs_fs_info *fs_info, struct bio *bio,
37 struct btrfs_bio *bbio, u64 stripe_len);
38
39void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page,
40 u64 logical);
41
42struct btrfs_raid_bio *
43raid56_parity_alloc_scrub_rbio(struct btrfs_fs_info *fs_info, struct bio *bio,
44 struct btrfs_bio *bbio, u64 stripe_len,
45 struct btrfs_device *scrub_dev,
46 unsigned long *dbitmap, int stripe_nsectors);
47void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);
48
49struct btrfs_raid_bio *
50raid56_alloc_missing_rbio(struct btrfs_fs_info *fs_info, struct bio *bio,
51 struct btrfs_bio *bbio, u64 length);
52void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio);
53
54int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
55void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
56
57#endif
58
