git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/super-io.h

   1 #ifndef _BCACHEFS_SUPER_IO_H
   2 #define _BCACHEFS_SUPER_IO_H
   3
   4 #include "extents.h"
   5 #include "eytzinger.h"
   6 #include "super_types.h"
   7 #include "super.h"
   8
   9 #include <asm/byteorder.h>
  10
  11 struct bch_sb_field *bch2_sb_field_get(struct bch_sb *, enum bch_sb_field_type);
  12 struct bch_sb_field *bch2_sb_field_resize(struct bch_sb_handle *,
  13                                           enum bch_sb_field_type, unsigned);
  14
  15 #define field_to_type(_f, _name)                                        \
  16         container_of_or_null(_f, struct bch_sb_field_##_name, field)
  17
  18 #define x(_name, _nr)                                                   \
  19 static inline struct bch_sb_field_##_name *                             \
  20 bch2_sb_get_##_name(struct bch_sb *sb)                                  \
  21 {                                                                       \
  22         return field_to_type(bch2_sb_field_get(sb,                      \
  23                                 BCH_SB_FIELD_##_name), _name);          \
  24 }                                                                       \
  25                                                                         \
  26 static inline struct bch_sb_field_##_name *                             \
  27 bch2_sb_resize_##_name(struct bch_sb_handle *sb, unsigned u64s) \
  28 {                                                                       \
  29         return field_to_type(bch2_sb_field_resize(sb,                   \
  30                                 BCH_SB_FIELD_##_name, u64s), _name);    \
  31 }
  32
  33 BCH_SB_FIELDS()
  34 #undef x
  35
  36 extern const char * const bch2_sb_fields[];
  37
  38 struct bch_sb_field_ops {
  39         const char *    (*validate)(struct bch_sb *, struct bch_sb_field *);
  40         size_t          (*to_text)(char *, size_t, struct bch_sb *,
  41                                    struct bch_sb_field *);
  42 };
  43
  44 static inline bool bch2_sb_test_feature(struct bch_sb *sb,
  45                                         enum bch_sb_features f)
  46 {
  47         unsigned w = f / 64;
  48         unsigned b = f % 64;
  49
  50         return le64_to_cpu(sb->features[w]) & (1ULL << b);
  51 }
  52
  53 static inline void bch2_sb_set_feature(struct bch_sb *sb,
  54                                        enum bch_sb_features f)
  55 {
  56         if (!bch2_sb_test_feature(sb, f)) {
  57                 unsigned w = f / 64;
  58                 unsigned b = f % 64;
  59
  60                 le64_add_cpu(&sb->features[w], 1ULL << b);
  61         }
  62 }
  63
  64 static inline __le64 bch2_sb_magic(struct bch_fs *c)
  65 {
  66         __le64 ret;
  67         memcpy(&ret, &c->sb.uuid, sizeof(ret));
  68         return ret;
  69 }
  70
  71 static inline __u64 jset_magic(struct bch_fs *c)
  72 {
  73         return __le64_to_cpu(bch2_sb_magic(c) ^ JSET_MAGIC);
  74 }
  75
  76 static inline __u64 bset_magic(struct bch_fs *c)
  77 {
  78         return __le64_to_cpu(bch2_sb_magic(c) ^ BSET_MAGIC);
  79 }
  80
  81 int bch2_sb_to_fs(struct bch_fs *, struct bch_sb *);
  82 int bch2_sb_from_fs(struct bch_fs *, struct bch_dev *);
  83
  84 void bch2_free_super(struct bch_sb_handle *);
  85 int bch2_sb_realloc(struct bch_sb_handle *, unsigned);
  86
  87 const char *bch2_sb_validate(struct bch_sb_handle *);
  88
  89 int bch2_read_super(const char *, struct bch_opts *, struct bch_sb_handle *);
  90 void bch2_write_super(struct bch_fs *);
  91
  92 /* BCH_SB_FIELD_journal: */
  93
  94 static inline unsigned bch2_nr_journal_buckets(struct bch_sb_field_journal *j)
  95 {
  96         return j
  97                 ? (__le64 *) vstruct_end(&j->field) - j->buckets
  98                 : 0;
  99 }
 100
 101 /* BCH_SB_FIELD_members: */
 102
 103 static inline bool bch2_member_exists(struct bch_member *m)
 104 {
 105         return !bch2_is_zero(m->uuid.b, sizeof(uuid_le));
 106 }
 107
 108 static inline bool bch2_dev_exists(struct bch_sb *sb,
 109                                    struct bch_sb_field_members *mi,
 110                                    unsigned dev)
 111 {
 112         return dev < sb->nr_devices &&
 113                 bch2_member_exists(&mi->members[dev]);
 114 }
 115
 116 static inline struct bch_member_cpu bch2_mi_to_cpu(struct bch_member *mi)
 117 {
 118         return (struct bch_member_cpu) {
 119                 .nbuckets       = le64_to_cpu(mi->nbuckets),
 120                 .first_bucket   = le16_to_cpu(mi->first_bucket),
 121                 .bucket_size    = le16_to_cpu(mi->bucket_size),
 122                 .group          = BCH_MEMBER_GROUP(mi),
 123                 .state          = BCH_MEMBER_STATE(mi),
 124                 .replacement    = BCH_MEMBER_REPLACEMENT(mi),
 125                 .discard        = BCH_MEMBER_DISCARD(mi),
 126                 .data_allowed   = BCH_MEMBER_DATA_ALLOWED(mi),
 127                 .durability     = BCH_MEMBER_DURABILITY(mi)
 128                         ? BCH_MEMBER_DURABILITY(mi) - 1
 129                         : 1,
 130                 .valid          = !bch2_is_zero(mi->uuid.b, sizeof(uuid_le)),
 131         };
 132 }
 133
 134 /* BCH_SB_FIELD_clean: */
 135
 136 void bch2_fs_mark_clean(struct bch_fs *, bool);
 137
 138 size_t bch2_sb_field_to_text(char *, size_t, struct bch_sb *,
 139                              struct bch_sb_field *);
 140
 141 #endif /* _BCACHEFS_SUPER_IO_H */