56 строки
1.6 KiB
C
56 строки
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2012 Fusion-io All rights reserved.
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* Copyright (C) 2012 Intel Corp. All rights reserved.
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*/
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#ifndef BTRFS_RAID56_H
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#define BTRFS_RAID56_H
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static inline int nr_parity_stripes(const struct map_lookup *map)
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{
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if (map->type & BTRFS_BLOCK_GROUP_RAID5)
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return 1;
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else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
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return 2;
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else
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return 0;
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}
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static inline int nr_data_stripes(const struct map_lookup *map)
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{
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return map->num_stripes - nr_parity_stripes(map);
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}
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#define RAID5_P_STRIPE ((u64)-2)
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#define RAID6_Q_STRIPE ((u64)-1)
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#define is_parity_stripe(x) (((x) == RAID5_P_STRIPE) || \
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((x) == RAID6_Q_STRIPE))
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struct btrfs_raid_bio;
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struct btrfs_device;
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int raid56_parity_recover(struct bio *bio, struct btrfs_io_context *bioc,
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u64 stripe_len, int mirror_num, int generic_io);
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int raid56_parity_write(struct bio *bio, struct btrfs_io_context *bioc,
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u64 stripe_len);
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void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page,
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u64 logical);
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struct btrfs_raid_bio *raid56_parity_alloc_scrub_rbio(struct bio *bio,
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struct btrfs_io_context *bioc, u64 stripe_len,
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struct btrfs_device *scrub_dev,
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unsigned long *dbitmap, int stripe_nsectors);
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void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);
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struct btrfs_raid_bio *
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raid56_alloc_missing_rbio(struct bio *bio, struct btrfs_io_context *bioc,
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u64 length);
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void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio);
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int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
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void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
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#endif
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