1 /*
2 * Copyright (C) 2012 Fusion-io All rights reserved.
3 * Copyright (C) 2012 Intel Corp. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public
7 * License v2 as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public
15 * License along with this program; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 021110-1307, USA.
18 */
19
20 #ifndef __BTRFS_RAID56__
21 #define __BTRFS_RAID56__
nr_parity_stripes(struct map_lookup * map)22 static inline int nr_parity_stripes(struct map_lookup *map)
23 {
24 if (map->type & BTRFS_BLOCK_GROUP_RAID5)
25 return 1;
26 else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
27 return 2;
28 else
29 return 0;
30 }
31
nr_data_stripes(struct map_lookup * map)32 static inline int nr_data_stripes(struct map_lookup *map)
33 {
34 return map->num_stripes - nr_parity_stripes(map);
35 }
36 #define RAID5_P_STRIPE ((u64)-2)
37 #define RAID6_Q_STRIPE ((u64)-1)
38
39 #define is_parity_stripe(x) (((x) == RAID5_P_STRIPE) || \
40 ((x) == RAID6_Q_STRIPE))
41
42 int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
43 struct btrfs_bio *bbio, u64 *raid_map,
44 u64 stripe_len, int mirror_num);
45 int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
46 struct btrfs_bio *bbio, u64 *raid_map,
47 u64 stripe_len);
48
49 int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
50 void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
51 #endif
52