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         struct bucket *_g = g;                                  \
  20         u64 _v = atomic64_read(&(g)->_mark.v);                  \
  21         struct bucket_mark _old;                                \
  22                                                                 \
  23         do {                                                    \
  24                 (new).v.counter = _old.v.counter = _v;          \
  25                 expr;                                           \
  26         } while ((_v = atomic64_cmpxchg(&(_g)->_mark.v,         \
  27                                _old.v.counter,                  \
  28                                (new).v.counter)) != _old.v.counter);\
  29         _old;                                                   \
  30 })
  31
  32 static inline struct bucket_array *__bucket_array(struct bch_dev *ca,
  33                                                   bool gc)
  34 {
  35         return rcu_dereference_check(ca->buckets[gc],
  36                                      !ca->fs ||
  37                                      percpu_rwsem_is_held(&ca->fs->mark_lock) ||
  38                                      lockdep_is_held(&ca->fs->gc_lock) ||
  39                                      lockdep_is_held(&ca->bucket_lock));
  40 }
  41
  42 static inline struct bucket_array *bucket_array(struct bch_dev *ca)
  43 {
  44         return __bucket_array(ca, false);
  45 }
  46
  47 static inline struct bucket *__bucket(struct bch_dev *ca, size_t b, bool gc)
  48 {
  49         struct bucket_array *buckets = __bucket_array(ca, gc);
  50
  51         BUG_ON(b < buckets->first_bucket || b >= buckets->nbuckets);
  52         return buckets->b + b;
  53 }
  54
  55 static inline struct bucket *bucket(struct bch_dev *ca, size_t b)
  56 {
  57         return __bucket(ca, b, false);
  58 }
  59
  60 static inline void bucket_io_clock_reset(struct bch_fs *c, struct bch_dev *ca,
  61                                          size_t b, int rw)
  62 {
  63         bucket(ca, b)->io_time[rw] = c->bucket_clock[rw].hand;
  64 }
  65
  66 static inline u16 bucket_last_io(struct bch_fs *c, struct bucket *g, int rw)
  67 {
  68         return c->bucket_clock[rw].hand - g->io_time[rw];
  69 }
  70
  71 /*
  72  * bucket_gc_gen() returns the difference between the bucket's current gen and
  73  * the oldest gen of any pointer into that bucket in the btree.
  74  */
  75
  76 static inline u8 bucket_gc_gen(struct bch_dev *ca, size_t b)
  77 {
  78         struct bucket *g = bucket(ca, b);
  79
  80         return g->mark.gen - g->oldest_gen;
  81 }
  82
  83 static inline size_t PTR_BUCKET_NR(const struct bch_dev *ca,
  84                                    const struct bch_extent_ptr *ptr)
  85 {
  86         return sector_to_bucket(ca, ptr->offset);
  87 }
  88
  89 static inline struct bucket *PTR_BUCKET(struct bch_dev *ca,
  90                                         const struct bch_extent_ptr *ptr,
  91                                         bool gc)
  92 {
  93         return __bucket(ca, PTR_BUCKET_NR(ca, ptr), gc);
  94 }
  95
  96 static inline struct bucket_mark ptr_bucket_mark(struct bch_dev *ca,
  97                                                  const struct bch_extent_ptr *ptr)
  98 {
  99         struct bucket_mark m;
 100
 101         rcu_read_lock();
 102         m = READ_ONCE(bucket(ca, PTR_BUCKET_NR(ca, ptr))->mark);
 103         rcu_read_unlock();
 104
 105         return m;
 106 }
 107
 108 static inline int gen_cmp(u8 a, u8 b)
 109 {
 110         return (s8) (a - b);
 111 }
 112
 113 static inline int gen_after(u8 a, u8 b)
 114 {
 115         int r = gen_cmp(a, b);
 116
 117         return r > 0 ? r : 0;
 118 }
 119
 120 /**
 121  * ptr_stale() - check if a pointer points into a bucket that has been
 122  * invalidated.
 123  */
 124 static inline u8 ptr_stale(struct bch_dev *ca,
 125                            const struct bch_extent_ptr *ptr)
 126 {
 127         return gen_after(ptr_bucket_mark(ca, ptr).gen, ptr->gen);
 128 }
 129
 130 static inline unsigned __ptr_disk_sectors(struct extent_ptr_decoded p,
 131                                           unsigned live_size)
 132 {
 133         return live_size && p.crc.compression_type
 134                 ? max(1U, DIV_ROUND_UP(live_size * p.crc.compressed_size,
 135                                        p.crc.uncompressed_size))
 136                 : live_size;
 137 }
 138
 139 static inline unsigned ptr_disk_sectors(struct extent_ptr_decoded p)
 140 {
 141         return __ptr_disk_sectors(p, p.crc.live_size);
 142 }
 143
 144 /* bucket gc marks */
 145
 146 static inline unsigned bucket_sectors_used(struct bucket_mark mark)
 147 {
 148         return mark.dirty_sectors + mark.cached_sectors;
 149 }
 150
 151 static inline bool bucket_unused(struct bucket_mark mark)
 152 {
 153         return !mark.owned_by_allocator &&
 154                 !mark.data_type &&
 155                 !bucket_sectors_used(mark);
 156 }
 157
 158 static inline bool is_available_bucket(struct bucket_mark mark)
 159 {
 160         return (!mark.owned_by_allocator &&
 161                 !mark.dirty_sectors &&
 162                 !mark.stripe);
 163 }
 164
 165 static inline bool bucket_needs_journal_commit(struct bucket_mark m,
 166                                                u16 last_seq_ondisk)
 167 {
 168         return m.journal_seq_valid &&
 169                 ((s16) m.journal_seq - (s16) last_seq_ondisk > 0);
 170 }
 171
 172 /* Device usage: */
 173
 174 struct bch_dev_usage bch2_dev_usage_read(struct bch_fs *, struct bch_dev *);
 175
 176 void bch2_dev_usage_from_buckets(struct bch_fs *, struct bch_dev *);
 177
 178 static inline u64 __dev_buckets_available(struct bch_dev *ca,
 179                                           struct bch_dev_usage stats)
 180 {
 181         u64 total = ca->mi.nbuckets - ca->mi.first_bucket;
 182
 183         if (WARN_ONCE(stats.buckets_unavailable > total,
 184                       "buckets_unavailable overflow (%llu > %llu)\n",
 185                       stats.buckets_unavailable, total))
 186                 return 0;
 187
 188         return total - stats.buckets_unavailable;
 189 }
 190
 191 /*
 192  * Number of reclaimable buckets - only for use by the allocator thread:
 193  */
 194 static inline u64 dev_buckets_available(struct bch_fs *c, struct bch_dev *ca)
 195 {
 196         return __dev_buckets_available(ca, bch2_dev_usage_read(c, ca));
 197 }
 198
 199 static inline u64 __dev_buckets_free(struct bch_dev *ca,
 200                                      struct bch_dev_usage stats)
 201 {
 202         return __dev_buckets_available(ca, stats) +
 203                 fifo_used(&ca->free[RESERVE_NONE]) +
 204                 fifo_used(&ca->free_inc);
 205 }
 206
 207 static inline u64 dev_buckets_free(struct bch_fs *c, struct bch_dev *ca)
 208 {
 209         return __dev_buckets_free(ca, bch2_dev_usage_read(c, ca));
 210 }
 211
 212 /* Filesystem usage: */
 213
 214 static inline unsigned fs_usage_u64s(struct bch_fs *c)
 215 {
 216
 217         return sizeof(struct bch_fs_usage) / sizeof(u64) +
 218                 READ_ONCE(c->replicas.nr);
 219 }
 220
 221 static inline struct bch_fs_usage *bch2_fs_usage_get_scratch(struct bch_fs *c)
 222 {
 223         struct bch_fs_usage *ret = this_cpu_ptr(c->usage_scratch);
 224
 225         memset(ret, 0, fs_usage_u64s(c) * sizeof(u64));
 226         return ret;
 227 }
 228
 229 struct bch_fs_usage *bch2_fs_usage_read(struct bch_fs *);
 230
 231 u64 bch2_fs_sectors_used(struct bch_fs *, struct bch_fs_usage *);
 232
 233 struct bch_fs_usage_short
 234 bch2_fs_usage_read_short(struct bch_fs *);
 235
 236 /* key/bucket marking: */
 237
 238 void bch2_bucket_seq_cleanup(struct bch_fs *);
 239 void bch2_fs_usage_initialize(struct bch_fs *);
 240
 241 void bch2_invalidate_bucket(struct bch_fs *, struct bch_dev *,
 242                             size_t, struct bucket_mark *);
 243 void bch2_mark_alloc_bucket(struct bch_fs *, struct bch_dev *,
 244                             size_t, bool, struct gc_pos, unsigned);
 245 void bch2_mark_metadata_bucket(struct bch_fs *, struct bch_dev *,
 246                                size_t, enum bch_data_type, unsigned,
 247                                struct gc_pos, unsigned);
 248
 249 #define BCH_BUCKET_MARK_GC                      (1 << 0)
 250 #define BCH_BUCKET_MARK_NOATOMIC                (1 << 1)
 251
 252 int bch2_mark_key_locked(struct bch_fs *, struct bkey_s_c,
 253                   bool, s64, struct gc_pos,
 254                   struct bch_fs_usage *, u64, unsigned);
 255 int bch2_mark_key(struct bch_fs *, struct bkey_s_c,
 256                   bool, s64, struct gc_pos,
 257                   struct bch_fs_usage *, u64, unsigned);
 258 void bch2_mark_update(struct btree_insert *, struct btree_insert_entry *);
 259 int bch2_fs_usage_apply(struct bch_fs *, struct bch_fs_usage *,
 260                         struct disk_reservation *);
 261
 262 /* disk reservations: */
 263
 264 void __bch2_disk_reservation_put(struct bch_fs *, struct disk_reservation *);
 265
 266 static inline void bch2_disk_reservation_put(struct bch_fs *c,
 267                                              struct disk_reservation *res)
 268 {
 269         if (res->sectors)
 270                 __bch2_disk_reservation_put(c, res);
 271 }
 272
 273 #define BCH_DISK_RESERVATION_NOFAIL             (1 << 0)
 274
 275 int bch2_disk_reservation_add(struct bch_fs *,
 276                              struct disk_reservation *,
 277                              unsigned, int);
 278
 279 static inline struct disk_reservation
 280 bch2_disk_reservation_init(struct bch_fs *c, unsigned nr_replicas)
 281 {
 282         return (struct disk_reservation) {
 283                 .sectors        = 0,
 284 #if 0
 285                 /* not used yet: */
 286                 .gen            = c->capacity_gen,
 287 #endif
 288                 .nr_replicas    = nr_replicas,
 289         };
 290 }
 291
 292 static inline int bch2_disk_reservation_get(struct bch_fs *c,
 293                                             struct disk_reservation *res,
 294                                             unsigned sectors,
 295                                             unsigned nr_replicas,
 296                                             int flags)
 297 {
 298         *res = bch2_disk_reservation_init(c, nr_replicas);
 299
 300         return bch2_disk_reservation_add(c, res, sectors * nr_replicas, flags);
 301 }
 302
 303 int bch2_dev_buckets_resize(struct bch_fs *, struct bch_dev *, u64);
 304 void bch2_dev_buckets_free(struct bch_dev *);
 305 int bch2_dev_buckets_alloc(struct bch_fs *, struct bch_dev *);
 306
 307 #endif /* _BUCKETS_H */