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

   1 /*
   2  * Code for manipulating bucket marks for garbage collection.
   3  *
   4  * Copyright 2014 Datera, Inc.
   5  */
   6
   7 #ifndef _BUCKETS_H
   8 #define _BUCKETS_H
   9
  10 #include "buckets_types.h"
  11 #include "super.h"
  12
  13 #define for_each_bucket(_b, _buckets)                           \
  14         for (_b = (_buckets)->b + (_buckets)->first_bucket;     \
  15              _b < (_buckets)->b + (_buckets)->nbuckets; _b++)
  16
  17 #define bucket_cmpxchg(g, new, expr)                            \
  18 ({                                                              \
  19         u64 _v = atomic64_read(&(g)->_mark.v);                  \
  20         struct bucket_mark _old;                                \
  21                                                                 \
  22         do {                                                    \
  23                 (new).v.counter = _old.v.counter = _v;          \
  24                 expr;                                           \
  25         } while ((_v = atomic64_cmpxchg(&(g)->_mark.v,          \
  26                                _old.v.counter,                  \
  27                                (new).v.counter)) != _old.v.counter);\
  28         _old;                                                   \
  29 })
  30
  31 static inline struct bucket_array *__bucket_array(struct bch_dev *ca,
  32                                                   bool gc)
  33 {
  34         return rcu_dereference_check(ca->buckets[gc],
  35                                      !ca->fs ||
  36                                      percpu_rwsem_is_held(&ca->fs->usage_lock) ||
  37                                      lockdep_is_held(&ca->fs->gc_lock) ||
  38                                      lockdep_is_held(&ca->bucket_lock));
  39 }
  40
  41 static inline struct bucket_array *bucket_array(struct bch_dev *ca)
  42 {
  43         return __bucket_array(ca, false);
  44 }
  45
  46 static inline struct bucket *__bucket(struct bch_dev *ca, size_t b, bool gc)
  47 {
  48         struct bucket_array *buckets = __bucket_array(ca, gc);
  49
  50         BUG_ON(b < buckets->first_bucket || b >= buckets->nbuckets);
  51         return buckets->b + b;
  52 }
  53
  54 static inline struct bucket *bucket(struct bch_dev *ca, size_t b)
  55 {
  56         return __bucket(ca, b, false);
  57 }
  58
  59 static inline void bucket_io_clock_reset(struct bch_fs *c, struct bch_dev *ca,
  60                                          size_t b, int rw)
  61 {
  62         bucket(ca, b)->io_time[rw] = c->bucket_clock[rw].hand;
  63 }
  64
  65 static inline u16 bucket_last_io(struct bch_fs *c, struct bucket *g, int rw)
  66 {
  67         return c->bucket_clock[rw].hand - g->io_time[rw];
  68 }
  69
  70 /*
  71  * bucket_gc_gen() returns the difference between the bucket's current gen and
  72  * the oldest gen of any pointer into that bucket in the btree.
  73  */
  74
  75 static inline u8 bucket_gc_gen(struct bch_dev *ca, size_t b)
  76 {
  77         return bucket(ca, b)->mark.gen - ca->oldest_gens[b];
  78 }
  79
  80 static inline size_t PTR_BUCKET_NR(const struct bch_dev *ca,
  81                                    const struct bch_extent_ptr *ptr)
  82 {
  83         return sector_to_bucket(ca, ptr->offset);
  84 }
  85
  86 static inline struct bucket *PTR_BUCKET(struct bch_dev *ca,
  87                                         const struct bch_extent_ptr *ptr)
  88 {
  89         return bucket(ca, PTR_BUCKET_NR(ca, ptr));
  90 }
  91
  92 static inline struct bucket_mark ptr_bucket_mark(struct bch_dev *ca,
  93                                                  const struct bch_extent_ptr *ptr)
  94 {
  95         struct bucket_mark m;
  96
  97         rcu_read_lock();
  98         m = READ_ONCE(bucket(ca, PTR_BUCKET_NR(ca, ptr))->mark);
  99         rcu_read_unlock();
 100
 101         return m;
 102 }
 103
 104 static inline int gen_cmp(u8 a, u8 b)
 105 {
 106         return (s8) (a - b);
 107 }
 108
 109 static inline int gen_after(u8 a, u8 b)
 110 {
 111         int r = gen_cmp(a, b);
 112
 113         return r > 0 ? r : 0;
 114 }
 115
 116 /**
 117  * ptr_stale() - check if a pointer points into a bucket that has been
 118  * invalidated.
 119  */
 120 static inline u8 ptr_stale(struct bch_dev *ca,
 121                            const struct bch_extent_ptr *ptr)
 122 {
 123         return gen_after(ptr_bucket_mark(ca, ptr).gen, ptr->gen);
 124 }
 125
 126 /* bucket gc marks */
 127
 128 static inline unsigned bucket_sectors_used(struct bucket_mark mark)
 129 {
 130         return mark.dirty_sectors + mark.cached_sectors;
 131 }
 132
 133 static inline bool bucket_unused(struct bucket_mark mark)
 134 {
 135         return !mark.owned_by_allocator &&
 136                 !mark.data_type &&
 137                 !bucket_sectors_used(mark);
 138 }
 139
 140 /* Device usage: */
 141
 142 struct bch_dev_usage __bch2_dev_usage_read(struct bch_dev *, bool);
 143 struct bch_dev_usage bch2_dev_usage_read(struct bch_fs *, struct bch_dev *);
 144
 145 static inline u64 __dev_buckets_available(struct bch_dev *ca,
 146                                           struct bch_dev_usage stats)
 147 {
 148         u64 total = ca->mi.nbuckets - ca->mi.first_bucket;
 149
 150         if (WARN_ONCE(stats.buckets_unavailable > total,
 151                       "buckets_unavailable overflow (%llu > %llu)\n",
 152                       stats.buckets_unavailable, total))
 153                 return 0;
 154
 155         return total - stats.buckets_unavailable;
 156 }
 157
 158 /*
 159  * Number of reclaimable buckets - only for use by the allocator thread:
 160  */
 161 static inline u64 dev_buckets_available(struct bch_fs *c, struct bch_dev *ca)
 162 {
 163         return __dev_buckets_available(ca, bch2_dev_usage_read(c, ca));
 164 }
 165
 166 static inline u64 __dev_buckets_free(struct bch_dev *ca,
 167                                      struct bch_dev_usage stats)
 168 {
 169         return __dev_buckets_available(ca, stats) +
 170                 fifo_used(&ca->free[RESERVE_NONE]) +
 171                 fifo_used(&ca->free_inc);
 172 }
 173
 174 static inline u64 dev_buckets_free(struct bch_fs *c, struct bch_dev *ca)
 175 {
 176         return __dev_buckets_free(ca, bch2_dev_usage_read(c, ca));
 177 }
 178
 179 /* Filesystem usage: */
 180
 181 struct bch_fs_usage __bch2_fs_usage_read(struct bch_fs *, bool);
 182 struct bch_fs_usage bch2_fs_usage_read(struct bch_fs *);
 183 void bch2_fs_usage_apply(struct bch_fs *, struct bch_fs_usage *,
 184                          struct disk_reservation *, struct gc_pos);
 185
 186 u64 bch2_fs_sectors_used(struct bch_fs *, struct bch_fs_usage);
 187
 188 static inline u64 bch2_fs_sectors_free(struct bch_fs *c,
 189                                        struct bch_fs_usage stats)
 190 {
 191         return c->capacity - bch2_fs_sectors_used(c, stats);
 192 }
 193
 194 static inline bool is_available_bucket(struct bucket_mark mark)
 195 {
 196         return (!mark.owned_by_allocator &&
 197                 !mark.dirty_sectors &&
 198                 !mark.stripe &&
 199                 !mark.nouse);
 200 }
 201
 202 static inline bool bucket_needs_journal_commit(struct bucket_mark m,
 203                                                u16 last_seq_ondisk)
 204 {
 205         return m.journal_seq_valid &&
 206                 ((s16) m.journal_seq - (s16) last_seq_ondisk > 0);
 207 }
 208
 209 void bch2_bucket_seq_cleanup(struct bch_fs *);
 210
 211 void bch2_invalidate_bucket(struct bch_fs *, struct bch_dev *,
 212                             size_t, struct bucket_mark *);
 213 void bch2_mark_alloc_bucket(struct bch_fs *, struct bch_dev *,
 214                             size_t, bool, struct gc_pos, unsigned);
 215 void bch2_mark_metadata_bucket(struct bch_fs *, struct bch_dev *,
 216                                size_t, enum bch_data_type, unsigned,
 217                                struct gc_pos, unsigned);
 218
 219 #define BCH_BUCKET_MARK_NOATOMIC                (1 << 0)
 220 #define BCH_BUCKET_MARK_GC                      (1 << 1)
 221
 222 int bch2_mark_key_locked(struct bch_fs *, struct bkey_s_c,
 223                   bool, s64, struct gc_pos,
 224                   struct bch_fs_usage *, u64, unsigned);
 225 int bch2_mark_key(struct bch_fs *, struct bkey_s_c,
 226                   bool, s64, struct gc_pos,
 227                   struct bch_fs_usage *, u64, unsigned);
 228 void bch2_mark_update(struct btree_insert *, struct btree_insert_entry *);
 229
 230 void __bch2_disk_reservation_put(struct bch_fs *, struct disk_reservation *);
 231
 232 static inline void bch2_disk_reservation_put(struct bch_fs *c,
 233                                              struct disk_reservation *res)
 234 {
 235         if (res->sectors)
 236                 __bch2_disk_reservation_put(c, res);
 237 }
 238
 239 #define BCH_DISK_RESERVATION_NOFAIL             (1 << 0)
 240 #define BCH_DISK_RESERVATION_GC_LOCK_HELD       (1 << 1)
 241 #define BCH_DISK_RESERVATION_BTREE_LOCKS_HELD   (1 << 2)
 242
 243 int bch2_disk_reservation_add(struct bch_fs *,
 244                              struct disk_reservation *,
 245                              unsigned, int);
 246
 247 static inline struct disk_reservation
 248 bch2_disk_reservation_init(struct bch_fs *c, unsigned nr_replicas)
 249 {
 250         return (struct disk_reservation) {
 251                 .sectors        = 0,
 252 #if 0
 253                 /* not used yet: */
 254                 .gen            = c->capacity_gen,
 255 #endif
 256                 .nr_replicas    = nr_replicas,
 257         };
 258 }
 259
 260 static inline int bch2_disk_reservation_get(struct bch_fs *c,
 261                                             struct disk_reservation *res,
 262                                             unsigned sectors,
 263                                             unsigned nr_replicas,
 264                                             int flags)
 265 {
 266         *res = bch2_disk_reservation_init(c, nr_replicas);
 267
 268         return bch2_disk_reservation_add(c, res, sectors * nr_replicas, flags);
 269 }
 270
 271 int bch2_dev_buckets_resize(struct bch_fs *, struct bch_dev *, u64);
 272 void bch2_dev_buckets_free(struct bch_dev *);
 273 int bch2_dev_buckets_alloc(struct bch_fs *, struct bch_dev *);
 274
 275 #endif /* _BUCKETS_H */