[linux-2.6-block.git] / fs / btrfs / raid56.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2012 Fusion-io  All rights reserved.
 * Copyright (C) 2012 Intel Corp. All rights reserved.
 */

#ifndef BTRFS_RAID56_H
#define BTRFS_RAID56_H

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))

struct btrfs_raid_bio;
struct btrfs_device;

int raid56_parity_recover(struct btrfs_fs_info *fs_info, struct bio *bio,
			  struct btrfs_bio *bbio, u64 stripe_len,
			  int mirror_num, int generic_io);
int raid56_parity_write(struct btrfs_fs_info *fs_info, struct bio *bio,
			       struct btrfs_bio *bbio, u64 stripe_len);

void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page,
			    u64 logical);

struct btrfs_raid_bio *
raid56_parity_alloc_scrub_rbio(struct btrfs_fs_info *fs_info, struct bio *bio,
			       struct btrfs_bio *bbio, u64 stripe_len,
			       struct btrfs_device *scrub_dev,
			       unsigned long *dbitmap, int stripe_nsectors);
void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);

struct btrfs_raid_bio *
raid56_alloc_missing_rbio(struct btrfs_fs_info *fs_info, struct bio *bio,
			  struct btrfs_bio *bbio, u64 length);
void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio);

int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);

#endif
Commit	Line	Data
9888c340	1	/* SPDX-License-Identifier: GPL-2.0 */
53b381b3 DW	2	/*
	3	* Copyright (C) 2012 Fusion-io All rights reserved.
	4	* Copyright (C) 2012 Intel Corp. All rights reserved.
53b381b3 DW	5	*/
53b381b3 DW	6
9888c340 DS	7	#ifndef BTRFS_RAID56_H
	8	#define BTRFS_RAID56_H
	9
53b381b3 DW	10	static inline int nr_parity_stripes(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
	20	static inline int nr_data_stripes(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
5a6ac9ea MX	30	struct btrfs_raid_bio;
	31	struct btrfs_device;
	32
2ff7e61e	33	int raid56_parity_recover(struct btrfs_fs_info fs_info, struct bio bio,
8e5cfb55 ZL	34	struct btrfs_bio *bbio, u64 stripe_len,
8e5cfb55 ZL	35	int mirror_num, int generic_io);
2ff7e61e	36	int raid56_parity_write(struct btrfs_fs_info fs_info, struct bio bio,
8e5cfb55	37	struct btrfs_bio *bbio, u64 stripe_len);
53b381b3	38
b4ee1782 OS	39	void raid56_add_scrub_pages(struct btrfs_raid_bio rbio, struct page page,
	40	u64 logical);
	41
5a6ac9ea	42	struct btrfs_raid_bio *
2ff7e61e	43	raid56_parity_alloc_scrub_rbio(struct btrfs_fs_info fs_info, struct bio bio,
8e5cfb55 ZL	44	struct btrfs_bio *bbio, u64 stripe_len,
8e5cfb55 ZL	45	struct btrfs_device *scrub_dev,
5a6ac9ea	46	unsigned long *dbitmap, int stripe_nsectors);
5a6ac9ea MX	47	void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);
5a6ac9ea MX	48
b4ee1782	49	struct btrfs_raid_bio *
2ff7e61e	50	raid56_alloc_missing_rbio(struct btrfs_fs_info fs_info, struct bio bio,
b4ee1782 OS	51	struct btrfs_bio *bbio, u64 length);
	52	void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio);
	53
53b381b3 DW	54	int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
53b381b3 DW	55	void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
9888c340	56
53b381b3	57	#endif