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authorKent Overstreet <kent.overstreet@gmail.com>2017-03-17 09:18:50 +0300
committerKent Overstreet <kent.overstreet@linux.dev>2023-10-23 00:08:07 +0300
commit1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a (patch)
tree9192de91a00908ee898bc331ac8b0544d6fc030a /fs/bcachefs/btree_cache.h
parent0d29a833b7b1800bd2759bbc064b5ada4729caf5 (diff)
downloadlinux-1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a.tar.xz
bcachefs: Initial commit
Initially forked from drivers/md/bcache, bcachefs is a new copy-on-write filesystem with every feature you could possibly want. Website: https://bcachefs.org Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/btree_cache.h')
-rw-r--r--fs/bcachefs/btree_cache.h91
1 files changed, 91 insertions, 0 deletions
diff --git a/fs/bcachefs/btree_cache.h b/fs/bcachefs/btree_cache.h
new file mode 100644
index 000000000000..f7b9bcfe09a3
--- /dev/null
+++ b/fs/bcachefs/btree_cache.h
@@ -0,0 +1,91 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_BTREE_CACHE_H
+#define _BCACHEFS_BTREE_CACHE_H
+
+#include "bcachefs.h"
+#include "btree_types.h"
+#include "extents.h"
+
+struct btree_iter;
+
+extern const char * const bch2_btree_ids[];
+
+void bch2_recalc_btree_reserve(struct bch_fs *);
+
+void bch2_btree_node_hash_remove(struct btree_cache *, struct btree *);
+int __bch2_btree_node_hash_insert(struct btree_cache *, struct btree *);
+int bch2_btree_node_hash_insert(struct btree_cache *, struct btree *,
+ unsigned, enum btree_id);
+
+void bch2_btree_cache_cannibalize_unlock(struct bch_fs *);
+int bch2_btree_cache_cannibalize_lock(struct bch_fs *, struct closure *);
+
+struct btree *bch2_btree_node_mem_alloc(struct bch_fs *);
+
+struct btree *bch2_btree_node_get(struct bch_fs *, struct btree_iter *,
+ const struct bkey_i *, unsigned,
+ enum six_lock_type, bool);
+
+struct btree *bch2_btree_node_get_sibling(struct bch_fs *, struct btree_iter *,
+ struct btree *, bool,
+ enum btree_node_sibling);
+
+void bch2_btree_node_prefetch(struct bch_fs *, struct btree_iter *,
+ const struct bkey_i *, unsigned);
+
+void bch2_fs_btree_cache_exit(struct bch_fs *);
+int bch2_fs_btree_cache_init(struct bch_fs *);
+void bch2_fs_btree_cache_init_early(struct btree_cache *);
+
+#define PTR_HASH(_k) (bkey_i_to_extent_c(_k)->v._data[0])
+
+/* is btree node in hash table? */
+static inline bool btree_node_hashed(struct btree *b)
+{
+ return bkey_extent_is_data(&b->key.k) && PTR_HASH(&b->key);
+}
+
+#define for_each_cached_btree(_b, _c, _tbl, _iter, _pos) \
+ for ((_tbl) = rht_dereference_rcu((_c)->btree_cache.table.tbl, \
+ &(_c)->btree_cache.table), \
+ _iter = 0; _iter < (_tbl)->size; _iter++) \
+ rht_for_each_entry_rcu((_b), (_pos), _tbl, _iter, hash)
+
+static inline size_t btree_bytes(struct bch_fs *c)
+{
+ return c->opts.btree_node_size << 9;
+}
+
+static inline size_t btree_max_u64s(struct bch_fs *c)
+{
+ return (btree_bytes(c) - sizeof(struct btree_node)) / sizeof(u64);
+}
+
+static inline size_t btree_page_order(struct bch_fs *c)
+{
+ return get_order(btree_bytes(c));
+}
+
+static inline size_t btree_pages(struct bch_fs *c)
+{
+ return 1 << btree_page_order(c);
+}
+
+static inline unsigned btree_blocks(struct bch_fs *c)
+{
+ return c->opts.btree_node_size >> c->block_bits;
+}
+
+#define BTREE_SPLIT_THRESHOLD(c) (btree_blocks(c) * 3 / 4)
+
+#define BTREE_FOREGROUND_MERGE_THRESHOLD(c) (btree_max_u64s(c) * 1 / 3)
+#define BTREE_FOREGROUND_MERGE_HYSTERESIS(c) \
+ (BTREE_FOREGROUND_MERGE_THRESHOLD(c) + \
+ (BTREE_FOREGROUND_MERGE_THRESHOLD(c) << 2))
+
+#define btree_node_root(_c, _b) ((_c)->btree_roots[(_b)->btree_id].b)
+
+int bch2_print_btree_node(struct bch_fs *, struct btree *,
+ char *, size_t);
+
+#endif /* _BCACHEFS_BTREE_CACHE_H */