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 10 static 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 20 static 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 30 struct btrfs_raid_bio; 31 struct btrfs_device; 32 33 int raid56_parity_recover(struct btrfs_fs_info *fs_info, struct bio *bio, 34 struct btrfs_bio *bbio, u64 stripe_len, 35 int mirror_num, int generic_io); 36 int raid56_parity_write(struct btrfs_fs_info *fs_info, struct bio *bio, 37 struct btrfs_bio *bbio, u64 stripe_len); 38 39 void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page, 40 u64 logical); 41 42 struct btrfs_raid_bio * 43 raid56_parity_alloc_scrub_rbio(struct btrfs_fs_info *fs_info, struct bio *bio, 44 struct btrfs_bio *bbio, u64 stripe_len, 45 struct btrfs_device *scrub_dev, 46 unsigned long *dbitmap, int stripe_nsectors); 47 void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio); 48 49 struct btrfs_raid_bio * 50 raid56_alloc_missing_rbio(struct btrfs_fs_info *fs_info, struct bio *bio, 51 struct btrfs_bio *bbio, u64 length); 52 void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio); 53 54 int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info); 55 void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info); 56 57 #endif 58