raid56.h (1654B)
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 u32 stripe_len, int mirror_num, int generic_io); 35int raid56_parity_write(struct bio *bio, struct btrfs_io_context *bioc, u32 stripe_len); 36 37void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page, 38 unsigned int pgoff, u64 logical); 39 40struct btrfs_raid_bio *raid56_parity_alloc_scrub_rbio(struct bio *bio, 41 struct btrfs_io_context *bioc, u32 stripe_len, 42 struct btrfs_device *scrub_dev, 43 unsigned long *dbitmap, int stripe_nsectors); 44void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio); 45 46struct btrfs_raid_bio * 47raid56_alloc_missing_rbio(struct bio *bio, struct btrfs_io_context *bioc, 48 u64 length); 49void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio); 50 51int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info); 52void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info); 53 54#endif