blob: 2b5d7977d83b2248e40d7331e4fd7d6d831ef1d6 [file] [log] [blame]
David Woodhouse53b381b2013-01-29 18:40:14 -05001/*
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
Miao Xie5a6ac9e2014-11-06 17:20:58 +080042struct btrfs_raid_bio;
43struct btrfs_device;
44
David Woodhouse53b381b2013-01-29 18:40:14 -050045int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
Zhao Lei8e5cfb52015-01-20 15:11:33 +080046 struct btrfs_bio *bbio, u64 stripe_len,
47 int mirror_num, int generic_io);
David Woodhouse53b381b2013-01-29 18:40:14 -050048int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
Zhao Lei8e5cfb52015-01-20 15:11:33 +080049 struct btrfs_bio *bbio, u64 stripe_len);
David Woodhouse53b381b2013-01-29 18:40:14 -050050
Miao Xie5a6ac9e2014-11-06 17:20:58 +080051struct btrfs_raid_bio *
52raid56_parity_alloc_scrub_rbio(struct btrfs_root *root, struct bio *bio,
Zhao Lei8e5cfb52015-01-20 15:11:33 +080053 struct btrfs_bio *bbio, u64 stripe_len,
54 struct btrfs_device *scrub_dev,
Miao Xie5a6ac9e2014-11-06 17:20:58 +080055 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
David Woodhouse53b381b2013-01-29 18:40:14 -050060int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
61void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
62#endif