1 files changed, 340 insertions, 0 deletions

diff --git a/fs/bcachefs/btree_update.h b/fs/bcachefs/btree_update.h
new file mode 100644
index 000000000000..9816d2286540
--- /dev/null
+++ b/fs/bcachefs/btree_update.h
@@ -0,0 +1,340 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_BTREE_UPDATE_H
+#define _BCACHEFS_BTREE_UPDATE_H
+
+#include "btree_iter.h"
+#include "journal.h"
+
+struct bch_fs;
+struct btree;
+
+void bch2_btree_node_prep_for_write(struct btree_trans *,
+				    struct btree_path *, struct btree *);
+bool bch2_btree_bset_insert_key(struct btree_trans *, struct btree_path *,
+				struct btree *, struct btree_node_iter *,
+				struct bkey_i *);
+
+int bch2_btree_node_flush0(struct journal *, struct journal_entry_pin *, u64);
+int bch2_btree_node_flush1(struct journal *, struct journal_entry_pin *, u64);
+void bch2_btree_add_journal_pin(struct bch_fs *, struct btree *, u64);
+
+void bch2_btree_insert_key_leaf(struct btree_trans *, struct btree_path *,
+				struct bkey_i *, u64);
+
+enum btree_insert_flags {
+	/* First bits for bch_watermark: */
+	__BTREE_INSERT_NOFAIL = BCH_WATERMARK_BITS,
+	__BTREE_INSERT_NOCHECK_RW,
+	__BTREE_INSERT_LAZY_RW,
+	__BTREE_INSERT_JOURNAL_REPLAY,
+	__BTREE_INSERT_JOURNAL_RECLAIM,
+	__BTREE_INSERT_NOWAIT,
+	__BTREE_INSERT_GC_LOCK_HELD,
+	__BCH_HASH_SET_MUST_CREATE,
+	__BCH_HASH_SET_MUST_REPLACE,
+};
+
+/* Don't check for -ENOSPC: */
+#define BTREE_INSERT_NOFAIL		BIT(__BTREE_INSERT_NOFAIL)
+
+#define BTREE_INSERT_NOCHECK_RW		BIT(__BTREE_INSERT_NOCHECK_RW)
+#define BTREE_INSERT_LAZY_RW		BIT(__BTREE_INSERT_LAZY_RW)
+
+/* Insert is for journal replay - don't get journal reservations: */
+#define BTREE_INSERT_JOURNAL_REPLAY	BIT(__BTREE_INSERT_JOURNAL_REPLAY)
+
+/* Insert is being called from journal reclaim path: */
+#define BTREE_INSERT_JOURNAL_RECLAIM	BIT(__BTREE_INSERT_JOURNAL_RECLAIM)
+
+/* Don't block on allocation failure (for new btree nodes: */
+#define BTREE_INSERT_NOWAIT		BIT(__BTREE_INSERT_NOWAIT)
+#define BTREE_INSERT_GC_LOCK_HELD	BIT(__BTREE_INSERT_GC_LOCK_HELD)
+
+#define BCH_HASH_SET_MUST_CREATE	BIT(__BCH_HASH_SET_MUST_CREATE)
+#define BCH_HASH_SET_MUST_REPLACE	BIT(__BCH_HASH_SET_MUST_REPLACE)
+
+int bch2_btree_delete_extent_at(struct btree_trans *, struct btree_iter *,
+				unsigned, unsigned);
+int bch2_btree_delete_at(struct btree_trans *, struct btree_iter *, unsigned);
+int bch2_btree_delete_at_buffered(struct btree_trans *, enum btree_id, struct bpos);
+int bch2_btree_delete(struct btree_trans *, enum btree_id, struct bpos, unsigned);
+
+int bch2_btree_insert_nonextent(struct btree_trans *, enum btree_id,
+				struct bkey_i *, enum btree_update_flags);
+
+int bch2_btree_insert_trans(struct btree_trans *, enum btree_id, struct bkey_i *,
+			enum btree_update_flags);
+int bch2_btree_insert(struct bch_fs *, enum btree_id, struct bkey_i *,
+		     struct disk_reservation *, int flags);
+
+int bch2_btree_delete_range_trans(struct btree_trans *, enum btree_id,
+				  struct bpos, struct bpos, unsigned, u64 *);
+int bch2_btree_delete_range(struct bch_fs *, enum btree_id,
+			    struct bpos, struct bpos, unsigned, u64 *);
+
+int bch2_btree_bit_mod(struct btree_trans *, enum btree_id, struct bpos, bool);
+
+int __bch2_insert_snapshot_whiteouts(struct btree_trans *, enum btree_id,
+				     struct bpos, struct bpos);
+
+/*
+ * For use when splitting extents in existing snapshots:
+ *
+ * If @old_pos is an interior snapshot node, iterate over descendent snapshot
+ * nodes: for every descendent snapshot in whiche @old_pos is overwritten and
+ * not visible, emit a whiteout at @new_pos.
+ */
+static inline int bch2_insert_snapshot_whiteouts(struct btree_trans *trans,
+						 enum btree_id btree,
+						 struct bpos old_pos,
+						 struct bpos new_pos)
+{
+	if (!btree_type_has_snapshots(btree) ||
+	    bkey_eq(old_pos, new_pos))
+		return 0;
+
+	return __bch2_insert_snapshot_whiteouts(trans, btree, old_pos, new_pos);
+}
+
+int bch2_trans_update_extent_overwrite(struct btree_trans *, struct btree_iter *,
+				       enum btree_update_flags,
+				       struct bkey_s_c, struct bkey_s_c);
+
+int bch2_bkey_get_empty_slot(struct btree_trans *, struct btree_iter *,
+			     enum btree_id, struct bpos);
+
+int __must_check bch2_trans_update(struct btree_trans *, struct btree_iter *,
+				   struct bkey_i *, enum btree_update_flags);
+int __must_check bch2_trans_update_seq(struct btree_trans *, u64, struct btree_iter *,
+				       struct bkey_i *, enum btree_update_flags);
+int __must_check bch2_trans_update_buffered(struct btree_trans *,
+					    enum btree_id, struct bkey_i *);
+
+void bch2_trans_commit_hook(struct btree_trans *,
+			    struct btree_trans_commit_hook *);
+int __bch2_trans_commit(struct btree_trans *, unsigned);
+
+__printf(2, 3) int bch2_fs_log_msg(struct bch_fs *, const char *, ...);
+__printf(2, 3) int bch2_journal_log_msg(struct bch_fs *, const char *, ...);
+
+/**
+ * bch2_trans_commit - insert keys at given iterator positions
+ *
+ * This is main entry point for btree updates.
+ *
+ * Return values:
+ * -EROFS: filesystem read only
+ * -EIO: journal or btree node IO error
+ */
+static inline int bch2_trans_commit(struct btree_trans *trans,
+				    struct disk_reservation *disk_res,
+				    u64 *journal_seq,
+				    unsigned flags)
+{
+	trans->disk_res		= disk_res;
+	trans->journal_seq	= journal_seq;
+
+	return __bch2_trans_commit(trans, flags);
+}
+
+#define commit_do(_trans, _disk_res, _journal_seq, _flags, _do)	\
+	lockrestart_do(_trans, _do ?: bch2_trans_commit(_trans, (_disk_res),\
+					(_journal_seq), (_flags)))
+
+#define nested_commit_do(_trans, _disk_res, _journal_seq, _flags, _do)	\
+	nested_lockrestart_do(_trans, _do ?: bch2_trans_commit(_trans, (_disk_res),\
+					(_journal_seq), (_flags)))
+
+#define bch2_trans_run(_c, _do)						\
+({									\
+	struct btree_trans *trans = bch2_trans_get(_c);			\
+	int _ret = (_do);						\
+	bch2_trans_put(trans);						\
+	_ret;								\
+})
+
+#define bch2_trans_do(_c, _disk_res, _journal_seq, _flags, _do)		\
+	bch2_trans_run(_c, commit_do(trans, _disk_res, _journal_seq, _flags, _do))
+
+#define trans_for_each_update(_trans, _i)				\
+	for ((_i) = (_trans)->updates;					\
+	     (_i) < (_trans)->updates + (_trans)->nr_updates;		\
+	     (_i)++)
+
+#define trans_for_each_wb_update(_trans, _i)				\
+	for ((_i) = (_trans)->wb_updates;				\
+	     (_i) < (_trans)->wb_updates + (_trans)->nr_wb_updates;	\
+	     (_i)++)
+
+static inline void bch2_trans_reset_updates(struct btree_trans *trans)
+{
+	struct btree_insert_entry *i;
+
+	trans_for_each_update(trans, i)
+		bch2_path_put(trans, i->path, true);
+
+	trans->extra_journal_res	= 0;
+	trans->nr_updates		= 0;
+	trans->nr_wb_updates		= 0;
+	trans->wb_updates		= NULL;
+	trans->hooks			= NULL;
+	trans->extra_journal_entries.nr	= 0;
+
+	if (trans->fs_usage_deltas) {
+		trans->fs_usage_deltas->used = 0;
+		memset((void *) trans->fs_usage_deltas +
+		       offsetof(struct replicas_delta_list, memset_start), 0,
+		       (void *) &trans->fs_usage_deltas->memset_end -
+		       (void *) &trans->fs_usage_deltas->memset_start);
+	}
+}
+
+static inline struct bkey_i *__bch2_bkey_make_mut_noupdate(struct btree_trans *trans, struct bkey_s_c k,
+						  unsigned type, unsigned min_bytes)
+{
+	unsigned bytes = max_t(unsigned, min_bytes, bkey_bytes(k.k));
+	struct bkey_i *mut;
+
+	if (type && k.k->type != type)
+		return ERR_PTR(-ENOENT);
+
+	mut = bch2_trans_kmalloc_nomemzero(trans, bytes);
+	if (!IS_ERR(mut)) {
+		bkey_reassemble(mut, k);
+
+		if (unlikely(bytes > bkey_bytes(k.k))) {
+			memset((void *) mut + bkey_bytes(k.k), 0,
+			       bytes - bkey_bytes(k.k));
+			mut->k.u64s = DIV_ROUND_UP(bytes, sizeof(u64));
+		}
+	}
+	return mut;
+}
+
+static inline struct bkey_i *bch2_bkey_make_mut_noupdate(struct btree_trans *trans, struct bkey_s_c k)
+{
+	return __bch2_bkey_make_mut_noupdate(trans, k, 0, 0);
+}
+
+#define bch2_bkey_make_mut_noupdate_typed(_trans, _k, _type)		\
+	bkey_i_to_##_type(__bch2_bkey_make_mut_noupdate(_trans, _k,	\
+				KEY_TYPE_##_type, sizeof(struct bkey_i_##_type)))
+
+static inline struct bkey_i *__bch2_bkey_make_mut(struct btree_trans *trans, struct btree_iter *iter,
+					struct bkey_s_c *k, unsigned flags,
+					unsigned type, unsigned min_bytes)
+{
+	struct bkey_i *mut = __bch2_bkey_make_mut_noupdate(trans, *k, type, min_bytes);
+	int ret;
+
+	if (IS_ERR(mut))
+		return mut;
+
+	ret = bch2_trans_update(trans, iter, mut, flags);
+	if (ret)
+		return ERR_PTR(ret);
+
+	*k = bkey_i_to_s_c(mut);
+	return mut;
+}
+
+static inline struct bkey_i *bch2_bkey_make_mut(struct btree_trans *trans, struct btree_iter *iter,
+						struct bkey_s_c *k, unsigned flags)
+{
+	return __bch2_bkey_make_mut(trans, iter, k, flags, 0, 0);
+}
+
+#define bch2_bkey_make_mut_typed(_trans, _iter, _k, _flags, _type)	\
+	bkey_i_to_##_type(__bch2_bkey_make_mut(_trans, _iter, _k, _flags,\
+				KEY_TYPE_##_type, sizeof(struct bkey_i_##_type)))
+
+static inline struct bkey_i *__bch2_bkey_get_mut_noupdate(struct btree_trans *trans,
+					 struct btree_iter *iter,
+					 unsigned btree_id, struct bpos pos,
+					 unsigned flags, unsigned type, unsigned min_bytes)
+{
+	struct bkey_s_c k = __bch2_bkey_get_iter(trans, iter,
+				btree_id, pos, flags|BTREE_ITER_INTENT, type);
+	struct bkey_i *ret = IS_ERR(k.k)
+		? ERR_CAST(k.k)
+		: __bch2_bkey_make_mut_noupdate(trans, k, 0, min_bytes);
+	if (IS_ERR(ret))
+		bch2_trans_iter_exit(trans, iter);
+	return ret;
+}
+
+static inline struct bkey_i *bch2_bkey_get_mut_noupdate(struct btree_trans *trans,
+					       struct btree_iter *iter,
+					       unsigned btree_id, struct bpos pos,
+					       unsigned flags)
+{
+	return __bch2_bkey_get_mut_noupdate(trans, iter, btree_id, pos, flags, 0, 0);
+}
+
+static inline struct bkey_i *__bch2_bkey_get_mut(struct btree_trans *trans,
+					 struct btree_iter *iter,
+					 unsigned btree_id, struct bpos pos,
+					 unsigned flags, unsigned type, unsigned min_bytes)
+{
+	struct bkey_i *mut = __bch2_bkey_get_mut_noupdate(trans, iter,
+				btree_id, pos, flags|BTREE_ITER_INTENT, type, min_bytes);
+	int ret;
+
+	if (IS_ERR(mut))
+		return mut;
+
+	ret = bch2_trans_update(trans, iter, mut, flags);
+	if (ret) {
+		bch2_trans_iter_exit(trans, iter);
+		return ERR_PTR(ret);
+	}
+
+	return mut;
+}
+
+static inline struct bkey_i *bch2_bkey_get_mut_minsize(struct btree_trans *trans,
+						       struct btree_iter *iter,
+						       unsigned btree_id, struct bpos pos,
+						       unsigned flags, unsigned min_bytes)
+{
+	return __bch2_bkey_get_mut(trans, iter, btree_id, pos, flags, 0, min_bytes);
+}
+
+static inline struct bkey_i *bch2_bkey_get_mut(struct btree_trans *trans,
+					       struct btree_iter *iter,
+					       unsigned btree_id, struct bpos pos,
+					       unsigned flags)
+{
+	return __bch2_bkey_get_mut(trans, iter, btree_id, pos, flags, 0, 0);
+}
+
+#define bch2_bkey_get_mut_typed(_trans, _iter, _btree_id, _pos, _flags, _type)\
+	bkey_i_to_##_type(__bch2_bkey_get_mut(_trans, _iter,		\
+			_btree_id, _pos, _flags,			\
+			KEY_TYPE_##_type, sizeof(struct bkey_i_##_type)))
+
+static inline struct bkey_i *__bch2_bkey_alloc(struct btree_trans *trans, struct btree_iter *iter,
+					       unsigned flags, unsigned type, unsigned val_size)
+{
+	struct bkey_i *k = bch2_trans_kmalloc(trans, sizeof(*k) + val_size);
+	int ret;
+
+	if (IS_ERR(k))
+		return k;
+
+	bkey_init(&k->k);
+	k->k.p = iter->pos;
+	k->k.type = type;
+	set_bkey_val_bytes(&k->k, val_size);
+
+	ret = bch2_trans_update(trans, iter, k, flags);
+	if (unlikely(ret))
+		return ERR_PTR(ret);
+	return k;
+}
+
+#define bch2_bkey_alloc(_trans, _iter, _flags, _type)			\
+	bkey_i_to_##_type(__bch2_bkey_alloc(_trans, _iter, _flags,	\
+				KEY_TYPE_##_type, sizeof(struct bch_##_type)))
+
+#endif /* _BCACHEFS_BTREE_UPDATE_H */