mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
![]() |
/*
|
||
|
* Copyright (C) 2012 Fusion-io All rights reserved.
|
||
|
* Copyright (C) 2012 Intel Corp. All rights reserved.
|
||
|
*
|
||
|
* This program is free software; you can redistribute it and/or
|
||
|
* modify it under the terms of the GNU General Public
|
||
|
* License v2 as published by the Free Software Foundation.
|
||
|
*
|
||
|
* This program is distributed in the hope that it will be useful,
|
||
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
* General Public License for more details.
|
||
|
*
|
||
|
* You should have received a copy of the GNU General Public
|
||
|
* License along with this program; if not, write to the
|
||
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||
|
* Boston, MA 021110-1307, USA.
|
||
|
*/
|
||
|
|
||
|
#ifndef __BTRFS_RAID56__
|
||
|
#define __BTRFS_RAID56__
|
||
|
static inline int nr_parity_stripes(struct map_lookup *map)
|
||
|
{
|
||
|
if (map->type & BTRFS_BLOCK_GROUP_RAID5)
|
||
|
return 1;
|
||
|
else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
|
||
|
return 2;
|
||
|
else
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static inline int nr_data_stripes(struct map_lookup *map)
|
||
|
{
|
||
|
return map->num_stripes - nr_parity_stripes(map);
|
||
|
}
|
||
|
#define RAID5_P_STRIPE ((u64)-2)
|
||
|
#define RAID6_Q_STRIPE ((u64)-1)
|
||
|
|
||
|
#define is_parity_stripe(x) (((x) == RAID5_P_STRIPE) || \
|
||
|
((x) == RAID6_Q_STRIPE))
|
||
|
|
||
|
int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
|
||
|
struct btrfs_bio *bbio, u64 *raid_map,
|
||
|
u64 stripe_len, int mirror_num);
|
||
|
int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
|
||
|
struct btrfs_bio *bbio, u64 *raid_map,
|
||
|
u64 stripe_len);
|
||
|
|
||
|
int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
|
||
|
void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
|
||
|
#endif
|