+static inline u8 alloc_gc_gen(struct bch_alloc_v4 a)
+{
+ return a.gen - a.oldest_gen;
+}
+
+static inline enum bch_data_type __alloc_data_type(u32 dirty_sectors,
+ u32 cached_sectors,
+ u32 stripe,
+ struct bch_alloc_v4 a,
+ enum bch_data_type data_type)
+{
+ if (stripe)
+ return data_type == BCH_DATA_parity ? data_type : BCH_DATA_stripe;
+ if (dirty_sectors)
+ return data_type;
+ if (cached_sectors)
+ return BCH_DATA_cached;
+ if (BCH_ALLOC_V4_NEED_DISCARD(&a))
+ return BCH_DATA_need_discard;
+ if (alloc_gc_gen(a) >= BUCKET_GC_GEN_MAX)
+ return BCH_DATA_need_gc_gens;
+ return BCH_DATA_free;
+}
+
+static inline enum bch_data_type alloc_data_type(struct bch_alloc_v4 a,
+ enum bch_data_type data_type)
+{
+ return __alloc_data_type(a.dirty_sectors, a.cached_sectors,
+ a.stripe, a, data_type);
+}
+
+static inline enum bch_data_type bucket_data_type(enum bch_data_type data_type)
+{
+ return data_type == BCH_DATA_stripe ? BCH_DATA_user : data_type;
+}
+
+static inline unsigned bch2_bucket_sectors(struct bch_alloc_v4 a)
+{
+ return a.dirty_sectors + a.cached_sectors;
+}
+
+static inline unsigned bch2_bucket_sectors_dirty(struct bch_alloc_v4 a)
+{
+ return a.dirty_sectors;
+}
+
+static inline unsigned bch2_bucket_sectors_fragmented(struct bch_dev *ca,
+ struct bch_alloc_v4 a)
+{
+ int d = bch2_bucket_sectors_dirty(a);
+
+ return d ? max(0, ca->mi.bucket_size - d) : 0;
+}
+
+static inline u64 alloc_lru_idx_read(struct bch_alloc_v4 a)
+{
+ return a.data_type == BCH_DATA_cached ? a.io_time[READ] : 0;
+}
+
+#define DATA_TYPES_MOVABLE \
+ ((1U << BCH_DATA_btree)| \
+ (1U << BCH_DATA_user)| \
+ (1U << BCH_DATA_stripe))
+
+static inline bool data_type_movable(enum bch_data_type type)
+{
+ return (1U << type) & DATA_TYPES_MOVABLE;
+}
+
+static inline u64 alloc_lru_idx_fragmentation(struct bch_alloc_v4 a,
+ struct bch_dev *ca)
+{
+ if (!data_type_movable(a.data_type) ||
+ !bch2_bucket_sectors_fragmented(ca, a))
+ return 0;