1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2012 Fusion-io All rights reserved.
4 * Copyright (C) 2012 Intel Corp. All rights reserved.
5 */
6
7 #ifndef BTRFS_RAID56_H
8 #define BTRFS_RAID56_H
9
nr_parity_stripes(struct map_lookup * map)10 static inline int nr_parity_stripes(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
nr_data_stripes(struct map_lookup * map)20 static inline int nr_data_stripes(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
30 struct btrfs_raid_bio;
31 struct btrfs_device;
32
33 int 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);
36 int raid56_parity_write(struct btrfs_fs_info *fs_info, struct bio *bio,
37 struct btrfs_bio *bbio, u64 stripe_len);
38
39 void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page,
40 u64 logical);
41
42 struct btrfs_raid_bio *
43 raid56_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);
47 void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);
48
49 struct btrfs_raid_bio *
50 raid56_alloc_missing_rbio(struct btrfs_fs_info *fs_info, struct bio *bio,
51 struct btrfs_bio *bbio, u64 length);
52 void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio);
53
54 int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
55 void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
56
57 #endif
58