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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Code for manipulating bucket marks for garbage collection.
   4  *
   5  * Copyright 2014 Datera, Inc.
   6  */
   7
   8 #ifndef _BUCKETS_H
   9 #define _BUCKETS_H
  10
  11 #include "buckets_types.h"
  12 #include "super.h"
  13
  14 #define for_each_bucket(_b, _buckets)                           \
  15         for (_b = (_buckets)->b + (_buckets)->first_bucket;     \
  16              _b < (_buckets)->b + (_buckets)->nbuckets; _b++)
  17
  18 #define bucket_cmpxchg(g, new, expr)                            \
  19 ({                                                              \
  20         struct bucket *_g = g;                                  \
  21         u64 _v = atomic64_read(&(g)->_mark.v);                  \
  22         struct bucket_mark _old;                                \
  23                                                                 \
  24         do {                                                    \
  25                 (new).v.counter = _old.v.counter = _v;          \
  26                 expr;                                           \
  27         } while ((_v = atomic64_cmpxchg(&(_g)->_mark.v,         \
  28                                _old.v.counter,                  \
  29                                (new).v.counter)) != _old.v.counter);\
  30         _old;                                                   \
  31 })
  32
  33 static inline struct bucket_array *__bucket_array(struct bch_dev *ca,
  34                                                   bool gc)
  35 {
  36         return rcu_dereference_check(ca->buckets[gc],
  37                                      !ca->fs ||
  38                                      percpu_rwsem_is_held(&ca->fs->mark_lock) ||
  39                                      lockdep_is_held(&ca->fs->gc_lock) ||
  40                                      lockdep_is_held(&ca->bucket_lock));
  41 }
  42
  43 static inline struct bucket_array *bucket_array(struct bch_dev *ca)
  44 {
  45         return __bucket_array(ca, false);
  46 }
  47
  48 static inline struct bucket *__bucket(struct bch_dev *ca, size_t b, bool gc)
  49 {
  50         struct bucket_array *buckets = __bucket_array(ca, gc);
  51
  52         BUG_ON(b < buckets->first_bucket || b >= buckets->nbuckets);
  53         return buckets->b + b;
  54 }
  55
  56 static inline struct bucket *bucket(struct bch_dev *ca, size_t b)
  57 {
  58         return __bucket(ca, b, false);
  59 }
  60
  61 static inline void bucket_io_clock_reset(struct bch_fs *c, struct bch_dev *ca,
  62                                          size_t b, int rw)
  63 {
  64         bucket(ca, b)->io_time[rw] = c->bucket_clock[rw].hand;
  65 }
  66
  67 static inline u16 bucket_last_io(struct bch_fs *c, struct bucket *g, int rw)
  68 {
  69         return c->bucket_clock[rw].hand - g->io_time[rw];
  70 }
  71
  72 /*
  73  * bucket_gc_gen() returns the difference between the bucket's current gen and
  74  * the oldest gen of any pointer into that bucket in the btree.
  75  */
  76
  77 static inline u8 bucket_gc_gen(struct bch_dev *ca, size_t b)
  78 {
  79         struct bucket *g = bucket(ca, b);
  80
  81         return g->mark.gen - g->oldest_gen;
  82 }
  83
  84 static inline size_t PTR_BUCKET_NR(const struct bch_dev *ca,
  85                                    const struct bch_extent_ptr *ptr)
  86 {
  87         return sector_to_bucket(ca, ptr->offset);
  88 }
  89
  90 static inline struct bucket *PTR_BUCKET(struct bch_dev *ca,
  91                                         const struct bch_extent_ptr *ptr,
  92                                         bool gc)
  93 {
  94         return __bucket(ca, PTR_BUCKET_NR(ca, ptr), gc);
  95 }
  96
  97 static inline enum bch_data_type ptr_data_type(const struct bkey *k,
  98                                                const struct bch_extent_ptr *ptr)
  99 {
 100         if (k->type == KEY_TYPE_btree_ptr)
 101                 return BCH_DATA_BTREE;
 102
 103         return ptr->cached ? BCH_DATA_CACHED : BCH_DATA_USER;
 104 }
 105
 106 static inline struct bucket_mark ptr_bucket_mark(struct bch_dev *ca,
 107                                                  const struct bch_extent_ptr *ptr)
 108 {
 109         struct bucket_mark m;
 110
 111         rcu_read_lock();
 112         m = READ_ONCE(PTR_BUCKET(ca, ptr, 0)->mark);
 113         rcu_read_unlock();
 114
 115         return m;
 116 }
 117
 118 static inline int gen_cmp(u8 a, u8 b)
 119 {
 120         return (s8) (a - b);
 121 }
 122
 123 static inline int gen_after(u8 a, u8 b)
 124 {
 125         int r = gen_cmp(a, b);
 126
 127         return r > 0 ? r : 0;
 128 }
 129
 130 /**
 131  * ptr_stale() - check if a pointer points into a bucket that has been
 132  * invalidated.
 133  */
 134 static inline u8 ptr_stale(struct bch_dev *ca,
 135                            const struct bch_extent_ptr *ptr)
 136 {
 137         return gen_after(ptr_bucket_mark(ca, ptr).gen, ptr->gen);
 138 }
 139
 140 static inline s64 __ptr_disk_sectors(struct extent_ptr_decoded p,
 141                                      unsigned live_size)
 142 {
 143         return live_size && p.crc.compression_type
 144                 ? max(1U, DIV_ROUND_UP(live_size * p.crc.compressed_size,
 145                                        p.crc.uncompressed_size))
 146                 : live_size;
 147 }
 148
 149 static inline s64 ptr_disk_sectors(struct extent_ptr_decoded p)
 150 {
 151         return __ptr_disk_sectors(p, p.crc.live_size);
 152 }
 153
 154 /* bucket gc marks */
 155
 156 static inline unsigned bucket_sectors_used(struct bucket_mark mark)
 157 {
 158         return mark.dirty_sectors + mark.cached_sectors;
 159 }
 160
 161 static inline bool bucket_unused(struct bucket_mark mark)
 162 {
 163         return !mark.owned_by_allocator &&
 164                 !mark.data_type &&
 165                 !bucket_sectors_used(mark);
 166 }
 167
 168 static inline bool is_available_bucket(struct bucket_mark mark)
 169 {
 170         return (!mark.owned_by_allocator &&
 171                 !mark.dirty_sectors &&
 172                 !mark.stripe);
 173 }
 174
 175 static inline bool bucket_needs_journal_commit(struct bucket_mark m,
 176                                                u16 last_seq_ondisk)
 177 {
 178         return m.journal_seq_valid &&
 179                 ((s16) m.journal_seq - (s16) last_seq_ondisk > 0);
 180 }
 181
 182 /* Device usage: */
 183
 184 struct bch_dev_usage bch2_dev_usage_read(struct bch_fs *, struct bch_dev *);
 185
 186 void bch2_dev_usage_from_buckets(struct bch_fs *);
 187
 188 static inline u64 __dev_buckets_available(struct bch_dev *ca,
 189                                           struct bch_dev_usage stats)
 190 {
 191         u64 total = ca->mi.nbuckets - ca->mi.first_bucket;
 192
 193         if (WARN_ONCE(stats.buckets_unavailable > total,
 194                       "buckets_unavailable overflow (%llu > %llu)\n",
 195                       stats.buckets_unavailable, total))
 196                 return 0;
 197
 198         return total - stats.buckets_unavailable;
 199 }
 200
 201 /*
 202  * Number of reclaimable buckets - only for use by the allocator thread:
 203  */
 204 static inline u64 dev_buckets_available(struct bch_fs *c, struct bch_dev *ca)
 205 {
 206         return __dev_buckets_available(ca, bch2_dev_usage_read(c, ca));
 207 }
 208
 209 static inline u64 __dev_buckets_free(struct bch_dev *ca,
 210                                      struct bch_dev_usage stats)
 211 {
 212         return __dev_buckets_available(ca, stats) +
 213                 fifo_used(&ca->free[RESERVE_NONE]) +
 214                 fifo_used(&ca->free_inc);
 215 }
 216
 217 static inline u64 dev_buckets_free(struct bch_fs *c, struct bch_dev *ca)
 218 {
 219         return __dev_buckets_free(ca, bch2_dev_usage_read(c, ca));
 220 }
 221
 222 /* Filesystem usage: */
 223
 224 static inline unsigned fs_usage_u64s(struct bch_fs *c)
 225 {
 226
 227         return sizeof(struct bch_fs_usage) / sizeof(u64) +
 228                 READ_ONCE(c->replicas.nr);
 229 }
 230
 231 void bch2_fs_usage_scratch_put(struct bch_fs *, struct bch_fs_usage *);
 232 struct bch_fs_usage *bch2_fs_usage_scratch_get(struct bch_fs *);
 233
 234 u64 bch2_fs_usage_read_one(struct bch_fs *, u64 *);
 235
 236 struct bch_fs_usage *bch2_fs_usage_read(struct bch_fs *);
 237
 238 void bch2_fs_usage_acc_to_base(struct bch_fs *, unsigned);
 239
 240 void bch2_fs_usage_to_text(struct printbuf *,
 241                            struct bch_fs *, struct bch_fs_usage *);
 242
 243 u64 bch2_fs_sectors_used(struct bch_fs *, struct bch_fs_usage *);
 244
 245 struct bch_fs_usage_short
 246 bch2_fs_usage_read_short(struct bch_fs *);
 247
 248 /* key/bucket marking: */
 249
 250 void bch2_bucket_seq_cleanup(struct bch_fs *);
 251 void bch2_fs_usage_initialize(struct bch_fs *);
 252
 253 void bch2_invalidate_bucket(struct bch_fs *, struct bch_dev *,
 254                             size_t, struct bucket_mark *);
 255 void bch2_mark_alloc_bucket(struct bch_fs *, struct bch_dev *,
 256                             size_t, bool, struct gc_pos, unsigned);
 257 void bch2_mark_metadata_bucket(struct bch_fs *, struct bch_dev *,
 258                                size_t, enum bch_data_type, unsigned,
 259                                struct gc_pos, unsigned);
 260
 261 int bch2_mark_key_locked(struct bch_fs *, struct bkey_s_c, unsigned, s64,
 262                          struct bch_fs_usage *, u64, unsigned);
 263 int bch2_mark_key(struct bch_fs *, struct bkey_s_c, unsigned, s64,
 264                   struct bch_fs_usage *, u64, unsigned);
 265 int bch2_fs_usage_apply(struct bch_fs *, struct bch_fs_usage *,
 266                         struct disk_reservation *, unsigned);
 267
 268 int bch2_mark_overwrite(struct btree_trans *, struct btree_iter *,
 269                         struct bkey_s_c, struct bkey_i *,
 270                         struct bch_fs_usage *, unsigned);
 271 int bch2_mark_update(struct btree_trans *, struct btree_iter *,
 272                      struct bkey_i *, struct bch_fs_usage *, unsigned);
 273
 274 int bch2_replicas_delta_list_apply(struct bch_fs *,
 275                                    struct bch_fs_usage *,
 276                                    struct replicas_delta_list *);
 277 int bch2_trans_mark_key(struct btree_trans *, struct bkey_s_c,
 278                         unsigned, s64, unsigned);
 279 int bch2_trans_mark_update(struct btree_trans *, struct btree_iter *iter,
 280                            struct bkey_i *insert, unsigned);
 281 void bch2_trans_fs_usage_apply(struct btree_trans *, struct bch_fs_usage *);
 282
 283 /* disk reservations: */
 284
 285 void __bch2_disk_reservation_put(struct bch_fs *, struct disk_reservation *);
 286
 287 static inline void bch2_disk_reservation_put(struct bch_fs *c,
 288                                              struct disk_reservation *res)
 289 {
 290         if (res->sectors)
 291                 __bch2_disk_reservation_put(c, res);
 292 }
 293
 294 #define BCH_DISK_RESERVATION_NOFAIL             (1 << 0)
 295
 296 int bch2_disk_reservation_add(struct bch_fs *,
 297                              struct disk_reservation *,
 298                              unsigned, int);
 299
 300 static inline struct disk_reservation
 301 bch2_disk_reservation_init(struct bch_fs *c, unsigned nr_replicas)
 302 {
 303         return (struct disk_reservation) {
 304                 .sectors        = 0,
 305 #if 0
 306                 /* not used yet: */
 307                 .gen            = c->capacity_gen,
 308 #endif
 309                 .nr_replicas    = nr_replicas,
 310         };
 311 }
 312
 313 static inline int bch2_disk_reservation_get(struct bch_fs *c,
 314                                             struct disk_reservation *res,
 315                                             unsigned sectors,
 316                                             unsigned nr_replicas,
 317                                             int flags)
 318 {
 319         *res = bch2_disk_reservation_init(c, nr_replicas);
 320
 321         return bch2_disk_reservation_add(c, res, sectors * nr_replicas, flags);
 322 }
 323
 324 int bch2_dev_buckets_resize(struct bch_fs *, struct bch_dev *, u64);
 325 void bch2_dev_buckets_free(struct bch_dev *);
 326 int bch2_dev_buckets_alloc(struct bch_fs *, struct bch_dev *);
 327
 328 #endif /* _BUCKETS_H */