1 files changed, 259 insertions, 0 deletions
diff --git a/fs/bcachefs/alloc_background.h b/fs/bcachefs/alloc_background.h
new file mode 100644
index 0000000000..73faf99a22
--- /dev/null
+++ b/fs/bcachefs/alloc_background.h
@@ -0,0 +1,259 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_ALLOC_BACKGROUND_H
+#define _BCACHEFS_ALLOC_BACKGROUND_H
+
+#include "bcachefs.h"
+#include "alloc_types.h"
+#include "buckets.h"
+#include "debug.h"
+#include "super.h"
+
+enum bkey_invalid_flags;
+
+/* How out of date a pointer gen is allowed to be: */
+#define BUCKET_GC_GEN_MAX	96U
+
+static inline bool bch2_dev_bucket_exists(struct bch_fs *c, struct bpos pos)
+{
+	struct bch_dev *ca;
+
+	if (!bch2_dev_exists2(c, pos.inode))
+		return false;
+
+	ca = bch_dev_bkey_exists(c, pos.inode);
+	return pos.offset >= ca->mi.first_bucket &&
+		pos.offset < ca->mi.nbuckets;
+}
+
+static inline u64 bucket_to_u64(struct bpos bucket)
+{
+	return (bucket.inode << 48) | bucket.offset;
+}
+
+static inline struct bpos u64_to_bucket(u64 bucket)
+{
+	return POS(bucket >> 48, bucket & ~(~0ULL << 48));
+}
+
+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 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) ||
+	    a.dirty_sectors >= ca->mi.bucket_size)
+		return 0;
+
+	return div_u64((u64) a.dirty_sectors * (1ULL << 31), ca->mi.bucket_size);
+}
+
+static inline u64 alloc_freespace_genbits(struct bch_alloc_v4 a)
+{
+	return ((u64) alloc_gc_gen(a) >> 4) << 56;
+}
+
+static inline struct bpos alloc_freespace_pos(struct bpos pos, struct bch_alloc_v4 a)
+{
+	pos.offset |= alloc_freespace_genbits(a);
+	return pos;
+}
+
+static inline unsigned alloc_v4_u64s(const struct bch_alloc_v4 *a)
+{
+	unsigned ret = (BCH_ALLOC_V4_BACKPOINTERS_START(a) ?:
+			BCH_ALLOC_V4_U64s_V0) +
+		BCH_ALLOC_V4_NR_BACKPOINTERS(a) *
+		(sizeof(struct bch_backpointer) / sizeof(u64));
+
+	BUG_ON(ret > U8_MAX - BKEY_U64s);
+	return ret;
+}
+
+static inline void set_alloc_v4_u64s(struct bkey_i_alloc_v4 *a)
+{
+	set_bkey_val_u64s(&a->k, alloc_v4_u64s(&a->v));
+}
+
+struct bkey_i_alloc_v4 *
+bch2_trans_start_alloc_update(struct btree_trans *, struct btree_iter *, struct bpos);
+
+void __bch2_alloc_to_v4(struct bkey_s_c, struct bch_alloc_v4 *);
+
+static inline const struct bch_alloc_v4 *bch2_alloc_to_v4(struct bkey_s_c k, struct bch_alloc_v4 *convert)
+{
+	const struct bch_alloc_v4 *ret;
+
+	if (unlikely(k.k->type != KEY_TYPE_alloc_v4))
+		goto slowpath;
+
+	ret = bkey_s_c_to_alloc_v4(k).v;
+	if (BCH_ALLOC_V4_BACKPOINTERS_START(ret) != BCH_ALLOC_V4_U64s)
+		goto slowpath;
+
+	return ret;
+slowpath:
+	__bch2_alloc_to_v4(k, convert);
+	return convert;
+}
+
+struct bkey_i_alloc_v4 *bch2_alloc_to_v4_mut(struct btree_trans *, struct bkey_s_c);
+
+int bch2_bucket_io_time_reset(struct btree_trans *, unsigned, size_t, int);
+
+int bch2_alloc_v1_invalid(struct bch_fs *, struct bkey_s_c,
+			  enum bkey_invalid_flags, struct printbuf *);
+int bch2_alloc_v2_invalid(struct bch_fs *, struct bkey_s_c,
+			  enum bkey_invalid_flags, struct printbuf *);
+int bch2_alloc_v3_invalid(struct bch_fs *, struct bkey_s_c,
+			  enum bkey_invalid_flags, struct printbuf *);
+int bch2_alloc_v4_invalid(struct bch_fs *, struct bkey_s_c,
+			  enum bkey_invalid_flags, struct printbuf *);
+void bch2_alloc_v4_swab(struct bkey_s);
+void bch2_alloc_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
+
+#define bch2_bkey_ops_alloc ((struct bkey_ops) {	\
+	.key_invalid	= bch2_alloc_v1_invalid,	\
+	.val_to_text	= bch2_alloc_to_text,		\
+	.trans_trigger	= bch2_trans_mark_alloc,	\
+	.atomic_trigger	= bch2_mark_alloc,		\
+	.min_val_size	= 8,				\
+})
+
+#define bch2_bkey_ops_alloc_v2 ((struct bkey_ops) {	\
+	.key_invalid	= bch2_alloc_v2_invalid,	\
+	.val_to_text	= bch2_alloc_to_text,		\
+	.trans_trigger	= bch2_trans_mark_alloc,	\
+	.atomic_trigger	= bch2_mark_alloc,		\
+	.min_val_size	= 8,				\
+})
+
+#define bch2_bkey_ops_alloc_v3 ((struct bkey_ops) {	\
+	.key_invalid	= bch2_alloc_v3_invalid,	\
+	.val_to_text	= bch2_alloc_to_text,		\
+	.trans_trigger	= bch2_trans_mark_alloc,	\
+	.atomic_trigger	= bch2_mark_alloc,		\
+	.min_val_size	= 16,				\
+})
+
+#define bch2_bkey_ops_alloc_v4 ((struct bkey_ops) {	\
+	.key_invalid	= bch2_alloc_v4_invalid,	\
+	.val_to_text	= bch2_alloc_to_text,		\
+	.swab		= bch2_alloc_v4_swab,		\
+	.trans_trigger	= bch2_trans_mark_alloc,	\
+	.atomic_trigger	= bch2_mark_alloc,		\
+	.min_val_size	= 48,				\
+})
+
+int bch2_bucket_gens_invalid(struct bch_fs *, struct bkey_s_c,
+			     enum bkey_invalid_flags, struct printbuf *);
+void bch2_bucket_gens_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
+
+#define bch2_bkey_ops_bucket_gens ((struct bkey_ops) {	\
+	.key_invalid	= bch2_bucket_gens_invalid,	\
+	.val_to_text	= bch2_bucket_gens_to_text,	\
+})
+
+int bch2_bucket_gens_init(struct bch_fs *);
+
+static inline bool bkey_is_alloc(const struct bkey *k)
+{
+	return  k->type == KEY_TYPE_alloc ||
+		k->type == KEY_TYPE_alloc_v2 ||
+		k->type == KEY_TYPE_alloc_v3;
+}
+
+int bch2_alloc_read(struct bch_fs *);
+
+int bch2_trans_mark_alloc(struct btree_trans *, enum btree_id, unsigned,
+			  struct bkey_s_c, struct bkey_i *, unsigned);
+int bch2_check_alloc_info(struct bch_fs *);
+int bch2_check_alloc_to_lru_refs(struct bch_fs *);
+void bch2_do_discards(struct bch_fs *);
+
+static inline u64 should_invalidate_buckets(struct bch_dev *ca,
+					    struct bch_dev_usage u)
+{
+	u64 want_free = ca->mi.nbuckets >> 7;
+	u64 free = max_t(s64, 0,
+			   u.d[BCH_DATA_free].buckets
+			 + u.d[BCH_DATA_need_discard].buckets
+			 - bch2_dev_buckets_reserved(ca, BCH_WATERMARK_stripe));
+
+	return clamp_t(s64, want_free - free, 0, u.d[BCH_DATA_cached].buckets);
+}
+
+void bch2_do_invalidates(struct bch_fs *);
+
+static inline struct bch_backpointer *alloc_v4_backpointers(struct bch_alloc_v4 *a)
+{
+	return (void *) ((u64 *) &a->v +
+			 (BCH_ALLOC_V4_BACKPOINTERS_START(a) ?:
+			  BCH_ALLOC_V4_U64s_V0));
+}
+
+static inline const struct bch_backpointer *alloc_v4_backpointers_c(const struct bch_alloc_v4 *a)
+{
+	return (void *) ((u64 *) &a->v + BCH_ALLOC_V4_BACKPOINTERS_START(a));
+}
+
+int bch2_dev_freespace_init(struct bch_fs *, struct bch_dev *, u64, u64);
+int bch2_fs_freespace_init(struct bch_fs *);
+
+void bch2_recalc_capacity(struct bch_fs *);
+u64 bch2_min_rw_member_capacity(struct bch_fs *);
+
+void bch2_dev_allocator_remove(struct bch_fs *, struct bch_dev *);
+void bch2_dev_allocator_add(struct bch_fs *, struct bch_dev *);
+
+void bch2_fs_allocator_background_init(struct bch_fs *);
+
+#endif /* _BCACHEFS_ALLOC_BACKGROUND_H */