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 #include "bkey_methods.h" 8 9 extern const char * const bch2_btree_node_flags[]; 10 11 struct btree_iter; 12 13 void bch2_recalc_btree_reserve(struct bch_fs *); 14 15 void bch2_btree_node_hash_remove(struct btree_cache *, struct btree *); 16 int __bch2_btree_node_hash_insert(struct btree_cache *, struct btree *); 17 int bch2_btree_node_hash_insert(struct btree_cache *, struct btree *, 18 unsigned, enum btree_id); 19 20 void bch2_btree_cache_cannibalize_unlock(struct btree_trans *); 21 int bch2_btree_cache_cannibalize_lock(struct btree_trans *, struct closure *); 22 23 struct btree *__bch2_btree_node_mem_alloc(struct bch_fs *); 24 struct btree *bch2_btree_node_mem_alloc(struct btree_trans *, bool); 25 26 struct btree *bch2_btree_node_get(struct btree_trans *, struct btree_path *, 27 const struct bkey_i *, unsigned, 28 enum six_lock_type, unsigned long); 29 30 struct btree *bch2_btree_node_get_noiter(struct btree_trans *, const struct bkey_i *, 31 enum btree_id, unsigned, bool); 32 33 int bch2_btree_node_prefetch(struct btree_trans *, struct btree_path *, 34 const struct bkey_i *, enum btree_id, unsigned); 35 36 void bch2_btree_node_evict(struct btree_trans *, const struct bkey_i *); 37 38 void bch2_fs_btree_cache_exit(struct bch_fs *); 39 int bch2_fs_btree_cache_init(struct bch_fs *); 40 void bch2_fs_btree_cache_init_early(struct btree_cache *); 41 42 static inline u64 btree_ptr_hash_val(const struct bkey_i *k) 43 { 44 switch (k->k.type) { 45 case KEY_TYPE_btree_ptr: 46 return *((u64 *) bkey_i_to_btree_ptr_c(k)->v.start); 47 case KEY_TYPE_btree_ptr_v2: 48 /* 49 * The cast/deref is only necessary to avoid sparse endianness 50 * warnings: 51 */ 52 return *((u64 *) &bkey_i_to_btree_ptr_v2_c(k)->v.seq); 53 default: 54 return 0; 55 } 56 } 57 58 static inline struct btree *btree_node_mem_ptr(const struct bkey_i *k) 59 { 60 return k->k.type == KEY_TYPE_btree_ptr_v2 61 ? (void *)(unsigned long)bkey_i_to_btree_ptr_v2_c(k)->v.mem_ptr 62 : NULL; 63 } 64 65 /* is btree node in hash table? */ 66 static inline bool btree_node_hashed(struct btree *b) 67 { 68 return b->hash_val != 0; 69 } 70 71 #define for_each_cached_btree(_b, _c, _tbl, _iter, _pos) \ 72 for ((_tbl) = rht_dereference_rcu((_c)->btree_cache.table.tbl, \ 73 &(_c)->btree_cache.table), \ 74 _iter = 0; _iter < (_tbl)->size; _iter++) \ 75 rht_for_each_entry_rcu((_b), (_pos), _tbl, _iter, hash) 76 77 static inline size_t btree_buf_bytes(const struct btree *b) 78 { 79 return 1UL << b->byte_order; 80 } 81 82 static inline size_t btree_buf_max_u64s(const struct btree *b) 83 { 84 return (btree_buf_bytes(b) - sizeof(struct btree_node)) / sizeof(u64); 85 } 86 87 static inline size_t btree_max_u64s(const struct bch_fs *c) 88 { 89 return (c->opts.btree_node_size - sizeof(struct btree_node)) / sizeof(u64); 90 } 91 92 static inline size_t btree_sectors(const struct bch_fs *c) 93 { 94 return c->opts.btree_node_size >> SECTOR_SHIFT; 95 } 96 97 static inline unsigned btree_blocks(const struct bch_fs *c) 98 { 99 return btree_sectors(c) >> c->block_bits; 100 } 101 102 #define BTREE_SPLIT_THRESHOLD(c) (btree_max_u64s(c) * 2 / 3) 103 104 #define BTREE_FOREGROUND_MERGE_THRESHOLD(c) (btree_max_u64s(c) * 1 / 3) 105 #define BTREE_FOREGROUND_MERGE_HYSTERESIS(c) \ 106 (BTREE_FOREGROUND_MERGE_THRESHOLD(c) + \ 107 (BTREE_FOREGROUND_MERGE_THRESHOLD(c) >> 2)) 108 109 static inline unsigned btree_id_nr_alive(struct bch_fs *c) 110 { 111 return BTREE_ID_NR + c->btree_roots_extra.nr; 112 } 113 114 static inline struct btree_root *bch2_btree_id_root(struct bch_fs *c, unsigned id) 115 { 116 if (likely(id < BTREE_ID_NR)) { 117 return &c->btree_roots_known[id]; 118 } else { 119 unsigned idx = id - BTREE_ID_NR; 120 121 EBUG_ON(idx >= c->btree_roots_extra.nr); 122 return &c->btree_roots_extra.data[idx]; 123 } 124 } 125 126 static inline struct btree *btree_node_root(struct bch_fs *c, struct btree *b) 127 { 128 return bch2_btree_id_root(c, b->c.btree_id)->b; 129 } 130 131 const char *bch2_btree_id_str(enum btree_id); 132 void bch2_btree_pos_to_text(struct printbuf *, struct bch_fs *, const struct btree *); 133 void bch2_btree_node_to_text(struct printbuf *, struct bch_fs *, const struct btree *); 134 void bch2_btree_cache_to_text(struct printbuf *, const struct bch_fs *); 135 136 #endif /* _BCACHEFS_BTREE_CACHE_H */ 137