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__
22static 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
32static 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
42struct btrfs_raid_bio;
43struct btrfs_device;
44
45int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
46			  struct btrfs_bio *bbio, u64 stripe_len,
47			  int mirror_num, int generic_io);
48int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
49			       struct btrfs_bio *bbio, u64 stripe_len);
50
51struct btrfs_raid_bio *
52raid56_parity_alloc_scrub_rbio(struct btrfs_root *root, struct bio *bio,
53			       struct btrfs_bio *bbio, u64 stripe_len,
54			       struct btrfs_device *scrub_dev,
55			       unsigned long *dbitmap, int stripe_nsectors);
56void raid56_parity_add_scrub_pages(struct btrfs_raid_bio *rbio,
57				   struct page *page, u64 logical);
58void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);
59
60int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
61void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
62#endif
63