| David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 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__ |
| 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 | |
| 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 |