root/fs/btrfs/raid56.h

INCLUDED FROM

DEFINITIONS

1. nr_parity_stripes
2. nr_data_stripes

   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