Line data    Source code

       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        3060 :         if (map->type & BTRFS_BLOCK_GROUP_RAID5)
      25             :                 return 1;
      26        1276 :         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        6026 :         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