/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* btree.h - NILFS B-tree.
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*
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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*
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* Written by Koji Sato.
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*/
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#ifndef _NILFS_BTREE_H
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#define _NILFS_BTREE_H
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#include <linux/types.h>
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#include <linux/buffer_head.h>
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#include <linux/list.h>
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#include <linux/nilfs2_ondisk.h> /* nilfs_btree_node */
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#include "btnode.h"
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#include "bmap.h"
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/**
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* struct nilfs_btree_path - A path on which B-tree operations are executed
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* @bp_bh: buffer head of node block
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* @bp_sib_bh: buffer head of sibling node block
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* @bp_index: index of child node
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* @bp_oldreq: ptr end request for old ptr
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* @bp_newreq: ptr alloc request for new ptr
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* @bp_op: rebalance operation
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*/
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struct nilfs_btree_path {
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struct buffer_head *bp_bh;
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struct buffer_head *bp_sib_bh;
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int bp_index;
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union nilfs_bmap_ptr_req bp_oldreq;
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union nilfs_bmap_ptr_req bp_newreq;
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struct nilfs_btnode_chkey_ctxt bp_ctxt;
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void (*bp_op)(struct nilfs_bmap *, struct nilfs_btree_path *,
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int, __u64 *, __u64 *);
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};
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#define NILFS_BTREE_ROOT_SIZE NILFS_BMAP_SIZE
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#define NILFS_BTREE_ROOT_NCHILDREN_MAX \
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((NILFS_BTREE_ROOT_SIZE - sizeof(struct nilfs_btree_node)) / \
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(sizeof(__le64 /* dkey */) + sizeof(__le64 /* dptr */)))
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#define NILFS_BTREE_ROOT_NCHILDREN_MIN 0
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#define NILFS_BTREE_NODE_EXTRA_PAD_SIZE (sizeof(__le64))
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#define NILFS_BTREE_NODE_NCHILDREN_MAX(nodesize) \
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(((nodesize) - sizeof(struct nilfs_btree_node) - \
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NILFS_BTREE_NODE_EXTRA_PAD_SIZE) / \
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(sizeof(__le64 /* dkey */) + sizeof(__le64 /* dptr */)))
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#define NILFS_BTREE_NODE_NCHILDREN_MIN(nodesize) \
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((NILFS_BTREE_NODE_NCHILDREN_MAX(nodesize) - 1) / 2 + 1)
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#define NILFS_BTREE_KEY_MIN ((__u64)0)
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#define NILFS_BTREE_KEY_MAX (~(__u64)0)
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extern struct kmem_cache *nilfs_btree_path_cache;
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int nilfs_btree_init(struct nilfs_bmap *);
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int nilfs_btree_convert_and_insert(struct nilfs_bmap *, __u64, __u64,
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const __u64 *, const __u64 *, int);
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void nilfs_btree_init_gc(struct nilfs_bmap *);
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int nilfs_btree_broken_node_block(struct buffer_head *bh);
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#endif /* _NILFS_BTREE_H */
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