fs/bcachefs/replicas_format.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_REPLICAS_FORMAT_H
   3 #define _BCACHEFS_REPLICAS_FORMAT_H
   4
   5 struct bch_replicas_entry_v0 {
   6         __u8                    data_type;
   7         __u8                    nr_devs;
   8         __u8                    devs[] __counted_by(nr_devs);
   9 } __packed;
  10
  11 struct bch_sb_field_replicas_v0 {
  12         struct bch_sb_field     field;
  13         struct bch_replicas_entry_v0 entries[];
  14 } __packed __aligned(8);
  15
  16 struct bch_replicas_entry_v1 {
  17         __u8                    data_type;
  18         __u8                    nr_devs;
  19         __u8                    nr_required;
  20         __u8                    devs[] __counted_by(nr_devs);
  21 } __packed;
  22
  23 struct bch_sb_field_replicas {
  24         struct bch_sb_field     field;
  25         struct bch_replicas_entry_v1 entries[];
  26 } __packed __aligned(8);
  27
  28 #define replicas_entry_bytes(_i)                                        \
  29         (offsetof(typeof(*(_i)), devs) + (_i)->nr_devs)
  30
  31 #define replicas_entry_add_dev(e, d) ({                                 \
  32         (e)->nr_devs++;                                                 \
  33         (e)->devs[(e)->nr_devs - 1] = (d);                              \
  34 })
  35
  36 #endif /* _BCACHEFS_REPLICAS_FORMAT_H */