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 52