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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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67e0dd8f0d
This splits btree_iter into two components: btree_iter is now the externally visible componont, and it points to a btree_path which is now reference counted. This means we no longer have to clone iterators up front if they might be mutated - btree_path can be shared by multiple iterators, and cloned if an iterator would mutate a shared btree_path. This will help us use iterators more efficiently, as well as slimming down the main long lived state in btree_trans, and significantly cleans up the logic for iterator lifetimes. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
103 lines
3.1 KiB
C
103 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_BTREE_CACHE_H
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#define _BCACHEFS_BTREE_CACHE_H
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#include "bcachefs.h"
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#include "btree_types.h"
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struct btree_iter;
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void bch2_recalc_btree_reserve(struct bch_fs *);
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void bch2_btree_node_hash_remove(struct btree_cache *, struct btree *);
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int __bch2_btree_node_hash_insert(struct btree_cache *, struct btree *);
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int bch2_btree_node_hash_insert(struct btree_cache *, struct btree *,
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unsigned, enum btree_id);
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void bch2_btree_cache_cannibalize_unlock(struct bch_fs *);
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int bch2_btree_cache_cannibalize_lock(struct bch_fs *, struct closure *);
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struct btree *__bch2_btree_node_mem_alloc(struct bch_fs *);
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struct btree *bch2_btree_node_mem_alloc(struct bch_fs *);
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struct btree *bch2_btree_node_get(struct btree_trans *, struct btree_path *,
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const struct bkey_i *, unsigned,
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enum six_lock_type, unsigned long);
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struct btree *bch2_btree_node_get_noiter(struct bch_fs *, const struct bkey_i *,
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enum btree_id, unsigned, bool);
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int bch2_btree_node_prefetch(struct bch_fs *, struct btree_trans *, struct btree_path *,
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const struct bkey_i *, enum btree_id, unsigned);
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void bch2_btree_node_evict(struct bch_fs *, const struct bkey_i *);
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void bch2_fs_btree_cache_exit(struct bch_fs *);
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int bch2_fs_btree_cache_init(struct bch_fs *);
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void bch2_fs_btree_cache_init_early(struct btree_cache *);
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static inline u64 btree_ptr_hash_val(const struct bkey_i *k)
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{
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switch (k->k.type) {
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case KEY_TYPE_btree_ptr:
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return *((u64 *) bkey_i_to_btree_ptr_c(k)->v.start);
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case KEY_TYPE_btree_ptr_v2:
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return bkey_i_to_btree_ptr_v2_c(k)->v.seq;
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default:
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return 0;
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}
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}
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static inline struct btree *btree_node_mem_ptr(const struct bkey_i *k)
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{
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return k->k.type == KEY_TYPE_btree_ptr_v2
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? (void *)(unsigned long)bkey_i_to_btree_ptr_v2_c(k)->v.mem_ptr
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: NULL;
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}
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/* is btree node in hash table? */
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static inline bool btree_node_hashed(struct btree *b)
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{
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return b->hash_val != 0;
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}
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#define for_each_cached_btree(_b, _c, _tbl, _iter, _pos) \
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for ((_tbl) = rht_dereference_rcu((_c)->btree_cache.table.tbl, \
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&(_c)->btree_cache.table), \
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_iter = 0; _iter < (_tbl)->size; _iter++) \
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rht_for_each_entry_rcu((_b), (_pos), _tbl, _iter, hash)
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static inline size_t btree_bytes(struct bch_fs *c)
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{
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return c->opts.btree_node_size << 9;
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}
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static inline size_t btree_max_u64s(struct bch_fs *c)
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{
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return (btree_bytes(c) - sizeof(struct btree_node)) / sizeof(u64);
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}
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static inline size_t btree_pages(struct bch_fs *c)
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{
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return btree_bytes(c) / PAGE_SIZE;
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}
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static inline unsigned btree_blocks(struct bch_fs *c)
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{
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return c->opts.btree_node_size >> c->block_bits;
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}
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#define BTREE_SPLIT_THRESHOLD(c) (btree_max_u64s(c) * 2 / 3)
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#define BTREE_FOREGROUND_MERGE_THRESHOLD(c) (btree_max_u64s(c) * 1 / 3)
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#define BTREE_FOREGROUND_MERGE_HYSTERESIS(c) \
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(BTREE_FOREGROUND_MERGE_THRESHOLD(c) + \
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(BTREE_FOREGROUND_MERGE_THRESHOLD(c) >> 2))
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#define btree_node_root(_c, _b) ((_c)->btree_roots[(_b)->c.btree_id].b)
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void bch2_btree_node_to_text(struct printbuf *, struct bch_fs *,
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struct btree *);
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void bch2_btree_cache_to_text(struct printbuf *, struct bch_fs *);
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#endif /* _BCACHEFS_BTREE_CACHE_H */
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