fs/bcachefs/alloc_background_format.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_ALLOC_BACKGROUND_FORMAT_H
   3 #define _BCACHEFS_ALLOC_BACKGROUND_FORMAT_H
   4
   5 struct bch_alloc {
   6         struct bch_val          v;
   7         __u8                    fields;
   8         __u8                    gen;
   9         __u8                    data[];
  10 } __packed __aligned(8);
  11
  12 #define BCH_ALLOC_FIELDS_V1()                   \
  13         x(read_time,            16)             \
  14         x(write_time,           16)             \
  15         x(data_type,            8)              \
  16         x(dirty_sectors,        16)             \
  17         x(cached_sectors,       16)             \
  18         x(oldest_gen,           8)              \
  19         x(stripe,               32)             \
  20         x(stripe_redundancy,    8)
  21
  22 enum {
  23 #define x(name, _bits) BCH_ALLOC_FIELD_V1_##name,
  24         BCH_ALLOC_FIELDS_V1()
  25 #undef x
  26 };
  27
  28 struct bch_alloc_v2 {
  29         struct bch_val          v;
  30         __u8                    nr_fields;
  31         __u8                    gen;
  32         __u8                    oldest_gen;
  33         __u8                    data_type;
  34         __u8                    data[];
  35 } __packed __aligned(8);
  36
  37 #define BCH_ALLOC_FIELDS_V2()                   \
  38         x(read_time,            64)             \
  39         x(write_time,           64)             \
  40         x(dirty_sectors,        32)             \
  41         x(cached_sectors,       32)             \
  42         x(stripe,               32)             \
  43         x(stripe_redundancy,    8)
  44
  45 struct bch_alloc_v3 {
  46         struct bch_val          v;
  47         __le64                  journal_seq;
  48         __le32                  flags;
  49         __u8                    nr_fields;
  50         __u8                    gen;
  51         __u8                    oldest_gen;
  52         __u8                    data_type;
  53         __u8                    data[];
  54 } __packed __aligned(8);
  55
  56 LE32_BITMASK(BCH_ALLOC_V3_NEED_DISCARD,struct bch_alloc_v3, flags,  0,  1)
  57 LE32_BITMASK(BCH_ALLOC_V3_NEED_INC_GEN,struct bch_alloc_v3, flags,  1,  2)
  58
  59 struct bch_alloc_v4 {
  60         struct bch_val          v;
  61         __u64                   journal_seq;
  62         __u32                   flags;
  63         __u8                    gen;
  64         __u8                    oldest_gen;
  65         __u8                    data_type;
  66         __u8                    stripe_redundancy;
  67         __u32                   dirty_sectors;
  68         __u32                   cached_sectors;
  69         __u64                   io_time[2];
  70         __u32                   stripe;
  71         __u32                   nr_external_backpointers;
  72         /* end of fields in original version of alloc_v4 */
  73         __u64                   _fragmentation_lru; /* obsolete */
  74         __u32                   stripe_sectors;
  75         __u32                   pad;
  76 } __packed __aligned(8);
  77
  78 #define BCH_ALLOC_V4_U64s_V0    6
  79 #define BCH_ALLOC_V4_U64s       (sizeof(struct bch_alloc_v4) / sizeof(__u64))
  80
  81 BITMASK(BCH_ALLOC_V4_NEED_DISCARD,      struct bch_alloc_v4, flags,  0,  1)
  82 BITMASK(BCH_ALLOC_V4_NEED_INC_GEN,      struct bch_alloc_v4, flags,  1,  2)
  83 BITMASK(BCH_ALLOC_V4_BACKPOINTERS_START,struct bch_alloc_v4, flags,  2,  8)
  84 BITMASK(BCH_ALLOC_V4_NR_BACKPOINTERS,   struct bch_alloc_v4, flags,  8,  14)
  85
  86 #define KEY_TYPE_BUCKET_GENS_BITS       8
  87 #define KEY_TYPE_BUCKET_GENS_NR         (1U << KEY_TYPE_BUCKET_GENS_BITS)
  88 #define KEY_TYPE_BUCKET_GENS_MASK       (KEY_TYPE_BUCKET_GENS_NR - 1)
  89
  90 struct bch_bucket_gens {
  91         struct bch_val          v;
  92         u8                      gens[KEY_TYPE_BUCKET_GENS_NR];
  93 } __packed __aligned(8);
  94
  95 #endif /* _BCACHEFS_ALLOC_BACKGROUND_FORMAT_H */