tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2012 Fusion-io All rights reserved.
4 * Copyright (C) 2012 Intel Corp. All rights reserved.
5 */
6
7#ifndef BTRFS_RAID56_H
8#define BTRFS_RAID56_H
9
10static inline int nr_parity_stripes(const struct map_lookup *map)
11{
12 if (map->type & BTRFS_BLOCK_GROUP_RAID5)
13 return 1;
14 else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
15 return 2;
16 else
17 return 0;
18}
19
20static inline int nr_data_stripes(const struct map_lookup *map)
21{
22 return map->num_stripes - nr_parity_stripes(map);
23}
24#define RAID5_P_STRIPE ((u64)-2)
25#define RAID6_Q_STRIPE ((u64)-1)
26
27#define is_parity_stripe(x) (((x) == RAID5_P_STRIPE) || \
28 ((x) == RAID6_Q_STRIPE))
29
30struct btrfs_raid_bio;
31struct btrfs_device;
32
33int raid56_parity_recover(struct bio *bio, struct btrfs_io_context *bioc,
34 u64 stripe_len, int mirror_num, int generic_io);
35int raid56_parity_write(struct bio *bio, struct btrfs_io_context *bioc,
36 u64 stripe_len);
37
38void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page,
39 u64 logical);
40
41struct btrfs_raid_bio *raid56_parity_alloc_scrub_rbio(struct bio *bio,
42 struct btrfs_io_context *bioc, u64 stripe_len,
43 struct btrfs_device *scrub_dev,
44 unsigned long *dbitmap, int stripe_nsectors);
45void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);
46
47struct btrfs_raid_bio *
48raid56_alloc_missing_rbio(struct bio *bio, struct btrfs_io_context *bioc,
49 u64 length);
50void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio);
51
52int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
53void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
54
55#endif