Branch data 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 [ # # ]: 0 : if (map->type & BTRFS_BLOCK_GROUP_RAID5)
25 : : return 1;
26 [ # # ]: 0 : 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 : 0 : 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
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