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