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

   1 #ifndef _BCACHEFS_BTREE_CACHE_H
   2 #define _BCACHEFS_BTREE_CACHE_H
   3
   4 #include "bcachefs.h"
   5 #include "btree_types.h"
   6
   7 struct btree_iter;
   8
   9 extern const char * const bch2_btree_ids[];
  10
  11 void bch2_recalc_btree_reserve(struct bch_fs *);
  12
  13 void bch2_btree_node_hash_remove(struct btree_cache *, struct btree *);
  14 int __bch2_btree_node_hash_insert(struct btree_cache *, struct btree *);
  15 int bch2_btree_node_hash_insert(struct btree_cache *, struct btree *,
  16                                 unsigned, enum btree_id);
  17
  18 void bch2_btree_cache_cannibalize_unlock(struct bch_fs *);
  19 int bch2_btree_cache_cannibalize_lock(struct bch_fs *, struct closure *);
  20
  21 struct btree *bch2_btree_node_mem_alloc(struct bch_fs *);
  22
  23 struct btree *bch2_btree_node_get(struct bch_fs *, struct btree_iter *,
  24                                   const struct bkey_i *, unsigned,
  25                                   enum six_lock_type);
  26
  27 struct btree *bch2_btree_node_get_sibling(struct bch_fs *, struct btree_iter *,
  28                                 struct btree *, enum btree_node_sibling);
  29
  30 void bch2_btree_node_prefetch(struct bch_fs *, struct btree_iter *,
  31                               const struct bkey_i *, unsigned);
  32
  33 void bch2_fs_btree_cache_exit(struct bch_fs *);
  34 int bch2_fs_btree_cache_init(struct bch_fs *);
  35 void bch2_fs_btree_cache_init_early(struct btree_cache *);
  36
  37 #define PTR_HASH(_k)    *((u64 *) &bkey_i_to_btree_ptr_c(_k)->v)
  38
  39 /* is btree node in hash table? */
  40 static inline bool btree_node_hashed(struct btree *b)
  41 {
  42         return b->key.k.type == KEY_TYPE_btree_ptr &&
  43                 PTR_HASH(&b->key);
  44 }
  45
  46 #define for_each_cached_btree(_b, _c, _tbl, _iter, _pos)                \
  47         for ((_tbl) = rht_dereference_rcu((_c)->btree_cache.table.tbl,  \
  48                                           &(_c)->btree_cache.table),    \
  49              _iter = 0; _iter < (_tbl)->size; _iter++)                  \
  50                 rht_for_each_entry_rcu((_b), (_pos), _tbl, _iter, hash)
  51
  52 static inline size_t btree_bytes(struct bch_fs *c)
  53 {
  54         return c->opts.btree_node_size << 9;
  55 }
  56
  57 static inline size_t btree_max_u64s(struct bch_fs *c)
  58 {
  59         return (btree_bytes(c) - sizeof(struct btree_node)) / sizeof(u64);
  60 }
  61
  62 static inline size_t btree_page_order(struct bch_fs *c)
  63 {
  64         return get_order(btree_bytes(c));
  65 }
  66
  67 static inline size_t btree_pages(struct bch_fs *c)
  68 {
  69         return 1 << btree_page_order(c);
  70 }
  71
  72 static inline unsigned btree_blocks(struct bch_fs *c)
  73 {
  74         return c->opts.btree_node_size >> c->block_bits;
  75 }
  76
  77 #define BTREE_SPLIT_THRESHOLD(c)                (btree_blocks(c) * 3 / 4)
  78
  79 #define BTREE_FOREGROUND_MERGE_THRESHOLD(c)     (btree_max_u64s(c) * 1 / 3)
  80 #define BTREE_FOREGROUND_MERGE_HYSTERESIS(c)                    \
  81         (BTREE_FOREGROUND_MERGE_THRESHOLD(c) +                  \
  82          (BTREE_FOREGROUND_MERGE_THRESHOLD(c) << 2))
  83
  84 #define btree_node_root(_c, _b) ((_c)->btree_roots[(_b)->btree_id].b)
  85
  86 void bch2_btree_node_to_text(struct printbuf *, struct bch_fs *,
  87                              struct btree *);
  88
  89 #endif /* _BCACHEFS_BTREE_CACHE_H */