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