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 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, unsigned long);
  26
  27 struct btree *bch2_btree_node_get_noiter(struct bch_fs *, const struct bkey_i *,
  28                                          enum btree_id, unsigned, bool);
  29
  30 void bch2_btree_node_prefetch(struct bch_fs *, struct btree_iter *,
  31                               const struct bkey_i *, enum btree_id, 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 static inline u64 btree_ptr_hash_val(const struct bkey_i *k)
  38 {
  39         switch (k->k.type) {
  40         case KEY_TYPE_btree_ptr:
  41                 return *((u64 *) bkey_i_to_btree_ptr_c(k)->v.start);
  42         case KEY_TYPE_btree_ptr_v2:
  43                 return bkey_i_to_btree_ptr_v2_c(k)->v.seq;
  44         default:
  45                 return 0;
  46         }
  47 }
  48
  49 static inline struct btree *btree_node_mem_ptr(const struct bkey_i *k)
  50 {
  51         return k->k.type == KEY_TYPE_btree_ptr_v2
  52                 ? (void *)(unsigned long)bkey_i_to_btree_ptr_v2_c(k)->v.mem_ptr
  53                 : NULL;
  54 }
  55
  56 /* is btree node in hash table? */
  57 static inline bool btree_node_hashed(struct btree *b)
  58 {
  59         return b->hash_val != 0;
  60 }
  61
  62 #define for_each_cached_btree(_b, _c, _tbl, _iter, _pos)                \
  63         for ((_tbl) = rht_dereference_rcu((_c)->btree_cache.table.tbl,  \
  64                                           &(_c)->btree_cache.table),    \
  65              _iter = 0; _iter < (_tbl)->size; _iter++)                  \
  66                 rht_for_each_entry_rcu((_b), (_pos), _tbl, _iter, hash)
  67
  68 static inline size_t btree_bytes(struct bch_fs *c)
  69 {
  70         return c->opts.btree_node_size << 9;
  71 }
  72
  73 static inline size_t btree_max_u64s(struct bch_fs *c)
  74 {
  75         return (btree_bytes(c) - sizeof(struct btree_node)) / sizeof(u64);
  76 }
  77
  78 static inline size_t btree_pages(struct bch_fs *c)
  79 {
  80         return btree_bytes(c) / PAGE_SIZE;
  81 }
  82
  83 static inline unsigned btree_blocks(struct bch_fs *c)
  84 {
  85         return c->opts.btree_node_size >> c->block_bits;
  86 }
  87
  88 #define BTREE_SPLIT_THRESHOLD(c)                (btree_max_u64s(c) * 2 / 3)
  89
  90 #define BTREE_FOREGROUND_MERGE_THRESHOLD(c)     (btree_max_u64s(c) * 1 / 3)
  91 #define BTREE_FOREGROUND_MERGE_HYSTERESIS(c)                    \
  92         (BTREE_FOREGROUND_MERGE_THRESHOLD(c) +                  \
  93          (BTREE_FOREGROUND_MERGE_THRESHOLD(c) >> 2))
  94
  95 #define btree_node_root(_c, _b) ((_c)->btree_roots[(_b)->c.btree_id].b)
  96
  97 void bch2_btree_node_to_text(struct printbuf *, struct bch_fs *,
  98                              struct btree *);
  99 void bch2_btree_cache_to_text(struct printbuf *, struct bch_fs *);
 100
 101 #endif /* _BCACHEFS_BTREE_CACHE_H */