1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2012 Fusion-io All rights reserved.
4*4882a593Smuzhiyun * Copyright (C) 2012 Intel Corp. All rights reserved.
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #ifndef BTRFS_RAID56_H
8*4882a593Smuzhiyun #define BTRFS_RAID56_H
9*4882a593Smuzhiyun
nr_parity_stripes(const struct map_lookup * map)10*4882a593Smuzhiyun static inline int nr_parity_stripes(const struct map_lookup *map)
11*4882a593Smuzhiyun {
12*4882a593Smuzhiyun if (map->type & BTRFS_BLOCK_GROUP_RAID5)
13*4882a593Smuzhiyun return 1;
14*4882a593Smuzhiyun else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
15*4882a593Smuzhiyun return 2;
16*4882a593Smuzhiyun else
17*4882a593Smuzhiyun return 0;
18*4882a593Smuzhiyun }
19*4882a593Smuzhiyun
nr_data_stripes(const struct map_lookup * map)20*4882a593Smuzhiyun static inline int nr_data_stripes(const struct map_lookup *map)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun return map->num_stripes - nr_parity_stripes(map);
23*4882a593Smuzhiyun }
24*4882a593Smuzhiyun #define RAID5_P_STRIPE ((u64)-2)
25*4882a593Smuzhiyun #define RAID6_Q_STRIPE ((u64)-1)
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun #define is_parity_stripe(x) (((x) == RAID5_P_STRIPE) || \
28*4882a593Smuzhiyun ((x) == RAID6_Q_STRIPE))
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun struct btrfs_raid_bio;
31*4882a593Smuzhiyun struct btrfs_device;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun int raid56_parity_recover(struct btrfs_fs_info *fs_info, struct bio *bio,
34*4882a593Smuzhiyun struct btrfs_bio *bbio, u64 stripe_len,
35*4882a593Smuzhiyun int mirror_num, int generic_io);
36*4882a593Smuzhiyun int raid56_parity_write(struct btrfs_fs_info *fs_info, struct bio *bio,
37*4882a593Smuzhiyun struct btrfs_bio *bbio, u64 stripe_len);
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page,
40*4882a593Smuzhiyun u64 logical);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun struct btrfs_raid_bio *
43*4882a593Smuzhiyun raid56_parity_alloc_scrub_rbio(struct btrfs_fs_info *fs_info, struct bio *bio,
44*4882a593Smuzhiyun struct btrfs_bio *bbio, u64 stripe_len,
45*4882a593Smuzhiyun struct btrfs_device *scrub_dev,
46*4882a593Smuzhiyun unsigned long *dbitmap, int stripe_nsectors);
47*4882a593Smuzhiyun void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun struct btrfs_raid_bio *
50*4882a593Smuzhiyun raid56_alloc_missing_rbio(struct btrfs_fs_info *fs_info, struct bio *bio,
51*4882a593Smuzhiyun struct btrfs_bio *bbio, u64 length);
52*4882a593Smuzhiyun void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio);
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
55*4882a593Smuzhiyun void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun #endif
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