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