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 extern struct lock_class_key bch2_btree_node_lock_key;
   9
  10 extern const char * const bch2_btree_node_flags[];
  11
  12 struct btree_iter;
  13
  14 void bch2_recalc_btree_reserve(struct bch_fs *);
  15
  16 void bch2_btree_node_hash_remove(struct btree_cache *, struct btree *);
  17 int __bch2_btree_node_hash_insert(struct btree_cache *, struct btree *);
  18 int bch2_btree_node_hash_insert(struct btree_cache *, struct btree *,
  19                                 unsigned, enum btree_id);
  20
  21 void bch2_btree_cache_cannibalize_unlock(struct bch_fs *);
  22 int bch2_btree_cache_cannibalize_lock(struct bch_fs *, struct closure *);
  23
  24 struct btree *__bch2_btree_node_mem_alloc(struct bch_fs *);
  25 struct btree *bch2_btree_node_mem_alloc(struct bch_fs *);
  26
  27 struct btree *bch2_btree_node_get(struct btree_trans *, struct btree_path *,
  28                                   const struct bkey_i *, unsigned,
  29                                   enum six_lock_type, unsigned long);
  30
  31 struct btree *bch2_btree_node_get_noiter(struct bch_fs *, const struct bkey_i *,
  32                                          enum btree_id, unsigned, bool);
  33
  34 int bch2_btree_node_prefetch(struct bch_fs *, struct btree_trans *, struct btree_path *,
  35                              const struct bkey_i *, enum btree_id, unsigned);
  36
  37 void bch2_btree_node_evict(struct bch_fs *, const struct bkey_i *);
  38
  39 void bch2_fs_btree_cache_exit(struct bch_fs *);
  40 int bch2_fs_btree_cache_init(struct bch_fs *);
  41 void bch2_fs_btree_cache_init_early(struct btree_cache *);
  42
  43 static inline u64 btree_ptr_hash_val(const struct bkey_i *k)
  44 {
  45         switch (k->k.type) {
  46         case KEY_TYPE_btree_ptr:
  47                 return *((u64 *) bkey_i_to_btree_ptr_c(k)->v.start);
  48         case KEY_TYPE_btree_ptr_v2:
  49                 return bkey_i_to_btree_ptr_v2_c(k)->v.seq;
  50         default:
  51                 return 0;
  52         }
  53 }
  54
  55 static inline struct btree *btree_node_mem_ptr(const struct bkey_i *k)
  56 {
  57         return k->k.type == KEY_TYPE_btree_ptr_v2
  58                 ? (void *)(unsigned long)bkey_i_to_btree_ptr_v2_c(k)->v.mem_ptr
  59                 : NULL;
  60 }
  61
  62 /* is btree node in hash table? */
  63 static inline bool btree_node_hashed(struct btree *b)
  64 {
  65         return b->hash_val != 0;
  66 }
  67
  68 #define for_each_cached_btree(_b, _c, _tbl, _iter, _pos)                \
  69         for ((_tbl) = rht_dereference_rcu((_c)->btree_cache.table.tbl,  \
  70                                           &(_c)->btree_cache.table),    \
  71              _iter = 0; _iter < (_tbl)->size; _iter++)                  \
  72                 rht_for_each_entry_rcu((_b), (_pos), _tbl, _iter, hash)
  73
  74 static inline size_t btree_bytes(struct bch_fs *c)
  75 {
  76         return c->opts.btree_node_size;
  77 }
  78
  79 static inline size_t btree_max_u64s(struct bch_fs *c)
  80 {
  81         return (btree_bytes(c) - sizeof(struct btree_node)) / sizeof(u64);
  82 }
  83
  84 static inline size_t btree_pages(struct bch_fs *c)
  85 {
  86         return btree_bytes(c) / PAGE_SIZE;
  87 }
  88
  89 static inline unsigned btree_blocks(struct bch_fs *c)
  90 {
  91         return btree_sectors(c) >> c->block_bits;
  92 }
  93
  94 #define BTREE_SPLIT_THRESHOLD(c)                (btree_max_u64s(c) * 2 / 3)
  95
  96 #define BTREE_FOREGROUND_MERGE_THRESHOLD(c)     (btree_max_u64s(c) * 1 / 3)
  97 #define BTREE_FOREGROUND_MERGE_HYSTERESIS(c)                    \
  98         (BTREE_FOREGROUND_MERGE_THRESHOLD(c) +                  \
  99          (BTREE_FOREGROUND_MERGE_THRESHOLD(c) >> 2))
 100
 101 #define btree_node_root(_c, _b) ((_c)->btree_roots[(_b)->c.btree_id].b)
 102
 103 void bch2_btree_node_to_text(struct printbuf *, struct bch_fs *,
 104                              struct btree *);
 105 void bch2_btree_cache_to_text(struct printbuf *, struct bch_fs *);
 106
 107 #endif /* _BCACHEFS_BTREE_CACHE_H */