diff options
Diffstat (limited to 'fs/btrfs/raid56.h')
-rw-r--r-- | fs/btrfs/raid56.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/fs/btrfs/raid56.h b/fs/btrfs/raid56.h new file mode 100644 index 000000000000..ea5d73bfdfbe --- /dev/null +++ b/fs/btrfs/raid56.h | |||
@@ -0,0 +1,51 @@ | |||
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 | ||