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 struct bch_sb_field *bch2_fs_sb_field_resize(struct bch_fs *,
  15                                          enum bch_sb_field_type, unsigned);
  16
  17 #define field_to_type(_f, _name)                                        \
  18         container_of_or_null(_f, struct bch_sb_field_##_name, field)
  19
  20 #define x(_name, _nr)                                                   \
  21 static inline struct bch_sb_field_##_name *                             \
  22 bch2_sb_get_##_name(struct bch_sb *sb)                                  \
  23 {                                                                       \
  24         return field_to_type(bch2_sb_field_get(sb,                      \
  25                                 BCH_SB_FIELD_##_name), _name);          \
  26 }                                                                       \
  27                                                                         \
  28 static inline struct bch_sb_field_##_name *                             \
  29 bch2_sb_resize_##_name(struct bch_sb_handle *sb, unsigned u64s) \
  30 {                                                                       \
  31         return field_to_type(bch2_sb_field_resize(sb,                   \
  32                                 BCH_SB_FIELD_##_name, u64s), _name);    \
  33 }                                                                       \
  34                                                                         \
  35 static inline struct bch_sb_field_##_name *                             \
  36 bch2_fs_sb_resize_##_name(struct bch_fs *c, unsigned u64s)              \
  37 {                                                                       \
  38         return field_to_type(bch2_fs_sb_field_resize(c,                 \
  39                                 BCH_SB_FIELD_##_name, u64s), _name);    \
  40 }
  41
  42 BCH_SB_FIELDS()
  43 #undef x
  44
  45 extern const char * const bch2_sb_fields[];
  46
  47 static inline bool bch2_sb_test_feature(struct bch_sb *sb,
  48                                         enum bch_sb_features f)
  49 {
  50         unsigned w = f / 64;
  51         unsigned b = f % 64;
  52
  53         return le64_to_cpu(sb->features[w]) & (1ULL << b);
  54 }
  55
  56 static inline void bch2_sb_set_feature(struct bch_sb *sb,
  57                                        enum bch_sb_features f)
  58 {
  59         if (!bch2_sb_test_feature(sb, f)) {
  60                 unsigned w = f / 64;
  61                 unsigned b = f % 64;
  62
  63                 le64_add_cpu(&sb->features[w], 1ULL << b);
  64         }
  65 }
  66
  67 static inline __le64 bch2_sb_magic(struct bch_fs *c)
  68 {
  69         __le64 ret;
  70         memcpy(&ret, &c->sb.uuid, sizeof(ret));
  71         return ret;
  72 }
  73
  74 static inline __u64 jset_magic(struct bch_fs *c)
  75 {
  76         return __le64_to_cpu(bch2_sb_magic(c) ^ JSET_MAGIC);
  77 }
  78
  79 static inline __u64 pset_magic(struct bch_fs *c)
  80 {
  81         return __le64_to_cpu(bch2_sb_magic(c) ^ PSET_MAGIC);
  82 }
  83
  84 static inline __u64 bset_magic(struct bch_fs *c)
  85 {
  86         return __le64_to_cpu(bch2_sb_magic(c) ^ BSET_MAGIC);
  87 }
  88
  89 int bch2_sb_to_fs(struct bch_fs *, struct bch_sb *);
  90 int bch2_sb_from_fs(struct bch_fs *, struct bch_dev *);
  91
  92 void bch2_free_super(struct bch_sb_handle *);
  93 int bch2_super_realloc(struct bch_sb_handle *, unsigned);
  94
  95 const char *bch2_sb_validate(struct bch_sb_handle *);
  96
  97 int bch2_read_super(const char *, struct bch_opts *, struct bch_sb_handle *);
  98 void bch2_write_super(struct bch_fs *);
  99
 100 /* BCH_SB_FIELD_journal: */
 101
 102 static inline unsigned bch2_nr_journal_buckets(struct bch_sb_field_journal *j)
 103 {
 104         return j
 105                 ? (__le64 *) vstruct_end(&j->field) - j->buckets
 106                 : 0;
 107 }
 108
 109 /* BCH_SB_FIELD_members: */
 110
 111 static inline bool bch2_member_exists(struct bch_member *m)
 112 {
 113         return !bch2_is_zero(m->uuid.b, sizeof(uuid_le));
 114 }
 115
 116 static inline bool bch2_dev_exists(struct bch_sb *sb,
 117                                    struct bch_sb_field_members *mi,
 118                                    unsigned dev)
 119 {
 120         return dev < sb->nr_devices &&
 121                 bch2_member_exists(&mi->members[dev]);
 122 }
 123
 124 static inline struct bch_member_cpu bch2_mi_to_cpu(struct bch_member *mi)
 125 {
 126         return (struct bch_member_cpu) {
 127                 .nbuckets       = le64_to_cpu(mi->nbuckets),
 128                 .first_bucket   = le16_to_cpu(mi->first_bucket),
 129                 .bucket_size    = le16_to_cpu(mi->bucket_size),
 130                 .group          = BCH_MEMBER_GROUP(mi),
 131                 .state          = BCH_MEMBER_STATE(mi),
 132                 .tier           = BCH_MEMBER_TIER(mi),
 133                 .replacement    = BCH_MEMBER_REPLACEMENT(mi),
 134                 .discard        = BCH_MEMBER_DISCARD(mi),
 135                 .data_allowed   = BCH_MEMBER_DATA_ALLOWED(mi),
 136                 .valid          = !bch2_is_zero(mi->uuid.b, sizeof(uuid_le)),
 137         };
 138 }
 139
 140 /* BCH_SB_FIELD_replicas: */
 141
 142 bool bch2_sb_has_replicas(struct bch_fs *, enum bch_data_type,
 143                           struct bch_devs_list);
 144 int bch2_check_mark_super(struct bch_fs *, enum bch_data_type,
 145                           struct bch_devs_list);
 146
 147 int bch2_cpu_replicas_to_text(struct bch_replicas_cpu *, char *, size_t);
 148 int bch2_sb_replicas_to_text(struct bch_sb_field_replicas *, char *, size_t);
 149
 150 struct replicas_status {
 151         struct {
 152                 unsigned        nr_online;
 153                 unsigned        nr_offline;
 154         }                       replicas[BCH_DATA_NR];
 155 };
 156
 157 struct replicas_status __bch2_replicas_status(struct bch_fs *,
 158                                               struct bch_devs_mask);
 159 struct replicas_status bch2_replicas_status(struct bch_fs *);
 160 bool bch2_have_enough_devs(struct bch_fs *, struct replicas_status, unsigned);
 161
 162 unsigned bch2_replicas_online(struct bch_fs *, bool);
 163 unsigned bch2_dev_has_data(struct bch_fs *, struct bch_dev *);
 164
 165 int bch2_replicas_gc_end(struct bch_fs *, int);
 166 int bch2_replicas_gc_start(struct bch_fs *, unsigned);
 167
 168 /* iterate over superblock replicas - used by userspace tools: */
 169
 170 static inline struct bch_replicas_entry *
 171 replicas_entry_next(struct bch_replicas_entry *i)
 172 {
 173         return (void *) i + offsetof(struct bch_replicas_entry, devs) + i->nr;
 174 }
 175
 176 #define for_each_replicas_entry(_r, _i)                                 \
 177         for (_i = (_r)->entries;                                        \
 178              (void *) (_i) < vstruct_end(&(_r)->field) && (_i)->data_type;\
 179              (_i) = replicas_entry_next(_i))
 180
 181 /* disk groups: */
 182
 183 static inline unsigned disk_groups_nr(struct bch_sb_field_disk_groups *groups)
 184 {
 185         return groups
 186                 ? (vstruct_end(&groups->field) -
 187                    (void *) &groups->entries[0]) / sizeof(struct bch_disk_group)
 188                 : 0;
 189 }
 190
 191 struct target {
 192         enum {
 193                 TARGET_NULL,
 194                 TARGET_DEV,
 195                 TARGET_GROUP,
 196         }                       type;
 197         union {
 198                 unsigned        dev;
 199                 unsigned        group;
 200         };
 201 };
 202
 203 static inline u16 dev_to_target(unsigned dev)
 204 {
 205         return 1 + dev;
 206 }
 207
 208 static inline u16 group_to_target(unsigned group)
 209 {
 210         return 1 + U8_MAX + group;
 211 }
 212
 213 static inline struct target target_decode(unsigned target)
 214 {
 215         if (!target)
 216                 return (struct target) { .type = TARGET_NULL };
 217
 218         --target;
 219         if (target <= U8_MAX)
 220                 return (struct target) { .type = TARGET_DEV, .dev = target };
 221
 222         target -= U8_MAX;
 223         return (struct target) { .type = TARGET_GROUP, .group = target };
 224 }
 225
 226 static inline bool dev_in_target(struct bch_dev *ca, unsigned target)
 227 {
 228         struct target t = target_decode(target);
 229
 230         switch (t.type) {
 231         case TARGET_DEV:
 232                 return ca->dev_idx == t.dev;
 233         case TARGET_GROUP:
 234                 return ca->mi.group && ca->mi.group == t.group;
 235         default:
 236                 BUG();
 237         }
 238 }
 239
 240 const struct bch_devs_mask *bch2_target_to_mask(struct bch_fs *, unsigned);
 241
 242 #endif /* _BCACHEFS_SUPER_IO_H */