1d5385b9f3
This inserts sanity checks soon after read btree node from disk. This allows early detection of broken btree nodes, and helps to narrow down problems due to file system corruption. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Koji Sato <koji@osrg.net>.
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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_fs.h>
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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 - B-tree structure
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* @bt_bmap: bmap base structure
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*/
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struct nilfs_btree {
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struct nilfs_bmap bt_bmap;
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};
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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_btree *, 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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