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
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