linux/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

#include <linux/types.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/bio.h>
#include <linux/refcount.h>
#include <linux/workqueue.h>
#include "volumes.h"

struct page;
struct sector_ptr;
struct btrfs_fs_info;

enum btrfs_rbio_ops { … };

struct btrfs_raid_bio { … };

/*
 * For trace event usage only. Records useful debug info for each bio submitted
 * by RAID56 to each physical device.
 *
 * No matter signed or not, (-1) is always the one indicating we can not grab
 * the proper stripe number.
 */
struct raid56_bio_trace_info { … };

static inline int nr_data_stripes(const struct btrfs_chunk_map *map)
{ … }

static inline int nr_bioc_data_stripes(const struct btrfs_io_context *bioc)
{ … }

#define RAID5_P_STRIPE …
#define RAID6_Q_STRIPE …

#define is_parity_stripe(x) …

struct btrfs_device;

void raid56_parity_recover(struct bio *bio, struct btrfs_io_context *bioc,
			   int mirror_num);
void raid56_parity_write(struct bio *bio, struct btrfs_io_context *bioc);

struct btrfs_raid_bio *raid56_parity_alloc_scrub_rbio(struct bio *bio,
				struct btrfs_io_context *bioc,
				struct btrfs_device *scrub_dev,
				unsigned long *dbitmap, int stripe_nsectors);
void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);

void raid56_parity_cache_data_pages(struct btrfs_raid_bio *rbio,
				    struct page **data_pages, u64 data_logical);

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

#endif