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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_BTREE_CACHE_H
   3 #define _BCACHEFS_BTREE_CACHE_H
   4
   5 #include "bcachefs.h"
   6 #include "btree_types.h"
   7
   8 struct btree_iter;
   9
  10 void bch2_recalc_btree_reserve(struct bch_fs *);
  11
  12 void bch2_btree_node_hash_remove(struct btree_cache *, struct btree *);
  13 int __bch2_btree_node_hash_insert(struct btree_cache *, struct btree *);
  14 int bch2_btree_node_hash_insert(struct btree_cache *, struct btree *,
  15                                 unsigned, enum btree_id);
  16
  17 void bch2_btree_cache_cannibalize_unlock(struct bch_fs *);
  18 int bch2_btree_cache_cannibalize_lock(struct bch_fs *, struct closure *);
  19
  20 struct btree *bch2_btree_node_mem_alloc(struct bch_fs *);
  21
  22 struct btree *bch2_btree_node_get(struct bch_fs *, struct btree_iter *,
  23                                   const struct bkey_i *, unsigned,
  24                                   enum six_lock_type, unsigned long);
  25
  26 struct btree *bch2_btree_node_get_noiter(struct bch_fs *, const struct bkey_i *,
  27                                          enum btree_id, unsigned, bool);
  28
  29 void bch2_btree_node_prefetch(struct bch_fs *, struct btree_iter *,
  30                               const struct bkey_i *, enum btree_id, unsigned);
  31
  32 void bch2_fs_btree_cache_exit(struct bch_fs *);
  33 int bch2_fs_btree_cache_init(struct bch_fs *);
  34 void bch2_fs_btree_cache_init_early(struct btree_cache *);
  35
  36 static inline u64 btree_ptr_hash_val(const struct bkey_i *k)
  37 {
  38         switch (k->k.type) {
  39         case KEY_TYPE_btree_ptr:
  40                 return *((u64 *) bkey_i_to_btree_ptr_c(k)->v.start);
  41         case KEY_TYPE_btree_ptr_v2:
  42                 return bkey_i_to_btree_ptr_v2_c(k)->v.seq;
  43         default:
  44                 return 0;
  45         }
  46 }
  47
  48 static inline struct btree *btree_node_mem_ptr(const struct bkey_i *k)
  49 {
  50         return k->k.type == KEY_TYPE_btree_ptr_v2
  51                 ? (void *)(unsigned long)bkey_i_to_btree_ptr_v2_c(k)->v.mem_ptr
  52                 : NULL;
  53 }
  54
  55 /* is btree node in hash table? */
  56 static inline bool btree_node_hashed(struct btree *b)
  57 {
  58         return b->hash_val != 0;
  59 }
  60
  61 #define for_each_cached_btree(_b, _c, _tbl, _iter, _pos)                \
  62         for ((_tbl) = rht_dereference_rcu((_c)->btree_cache.table.tbl,  \
  63                                           &(_c)->btree_cache.table),    \
  64              _iter = 0; _iter < (_tbl)->size; _iter++)                  \
  65                 rht_for_each_entry_rcu((_b), (_pos), _tbl, _iter, hash)
  66
  67 static inline size_t btree_bytes(struct bch_fs *c)
  68 {
  69         return c->opts.btree_node_size << 9;
  70 }
  71
  72 static inline size_t btree_max_u64s(struct bch_fs *c)
  73 {
  74         return (btree_bytes(c) - sizeof(struct btree_node)) / sizeof(u64);
  75 }
  76
  77 static inline size_t btree_pages(struct bch_fs *c)
  78 {
  79         return btree_bytes(c) / PAGE_SIZE;
  80 }
  81
  82 static inline unsigned btree_blocks(struct bch_fs *c)
  83 {
  84         return c->opts.btree_node_size >> c->block_bits;
  85 }
  86
  87 #define BTREE_SPLIT_THRESHOLD(c)                (btree_max_u64s(c) * 2 / 3)
  88
  89 #define BTREE_FOREGROUND_MERGE_THRESHOLD(c)     (btree_max_u64s(c) * 1 / 3)
  90 #define BTREE_FOREGROUND_MERGE_HYSTERESIS(c)                    \
  91         (BTREE_FOREGROUND_MERGE_THRESHOLD(c) +                  \
  92          (BTREE_FOREGROUND_MERGE_THRESHOLD(c) >> 2))
  93
  94 #define btree_node_root(_c, _b) ((_c)->btree_roots[(_b)->c.btree_id].b)
  95
  96 void bch2_btree_node_to_text(struct printbuf *, struct bch_fs *,
  97                              struct btree *);
  98 void bch2_btree_cache_to_text(struct printbuf *, struct bch_fs *);
  99
 100 #endif /* _BCACHEFS_BTREE_CACHE_H */