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-rw-r--r--fs/bcachefs/lru.h69
1 files changed, 69 insertions, 0 deletions
diff --git a/fs/bcachefs/lru.h b/fs/bcachefs/lru.h
new file mode 100644
index 0000000000..429dca816d
--- /dev/null
+++ b/fs/bcachefs/lru.h
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_LRU_H
+#define _BCACHEFS_LRU_H
+
+#define LRU_TIME_BITS 48
+#define LRU_TIME_MAX ((1ULL << LRU_TIME_BITS) - 1)
+
+static inline u64 lru_pos_id(struct bpos pos)
+{
+ return pos.inode >> LRU_TIME_BITS;
+}
+
+static inline u64 lru_pos_time(struct bpos pos)
+{
+ return pos.inode & ~(~0ULL << LRU_TIME_BITS);
+}
+
+static inline struct bpos lru_pos(u16 lru_id, u64 dev_bucket, u64 time)
+{
+ struct bpos pos = POS(((u64) lru_id << LRU_TIME_BITS)|time, dev_bucket);
+
+ EBUG_ON(time > LRU_TIME_MAX);
+ EBUG_ON(lru_pos_id(pos) != lru_id);
+ EBUG_ON(lru_pos_time(pos) != time);
+ EBUG_ON(pos.offset != dev_bucket);
+
+ return pos;
+}
+
+#define BCH_LRU_TYPES() \
+ x(read) \
+ x(fragmentation)
+
+enum bch_lru_type {
+#define x(n) BCH_LRU_##n,
+ BCH_LRU_TYPES()
+#undef x
+};
+
+#define BCH_LRU_FRAGMENTATION_START ((1U << 16) - 1)
+
+static inline enum bch_lru_type lru_type(struct bkey_s_c l)
+{
+ u16 lru_id = l.k->p.inode >> 48;
+
+ if (lru_id == BCH_LRU_FRAGMENTATION_START)
+ return BCH_LRU_fragmentation;
+ return BCH_LRU_read;
+}
+
+int bch2_lru_invalid(struct bch_fs *, struct bkey_s_c,
+ enum bkey_invalid_flags, struct printbuf *);
+void bch2_lru_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
+
+void bch2_lru_pos_to_text(struct printbuf *, struct bpos);
+
+#define bch2_bkey_ops_lru ((struct bkey_ops) { \
+ .key_invalid = bch2_lru_invalid, \
+ .val_to_text = bch2_lru_to_text, \
+ .min_val_size = 8, \
+})
+
+int bch2_lru_del(struct btree_trans *, u16, u64, u64);
+int bch2_lru_set(struct btree_trans *, u16, u64, u64);
+int bch2_lru_change(struct btree_trans *, u16, u64, u64, u64);
+
+int bch2_check_lrus(struct bch_fs *);
+
+#endif /* _BCACHEFS_LRU_H */