1/*
2 * Copyright (c) 2008 Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23//
24//	ExtentManager.h
25//
26#ifndef EXTENTMANAGER_H
27#define EXTENTMANAGER_H
28
29#include <list>
30#include <vector>
31#include <algorithm>
32#include <sys/types.h>
33#include <sys/errno.h>
34#include <cstdio>
35#include <cassert>
36using namespace std;
37
38struct ExtentInfo {
39	off_t blockAddr;
40	off_t numBlocks;
41};
42
43inline bool BeforeExtent(const ExtentInfo &a, const ExtentInfo &b)
44{
45		return (a.blockAddr + a.numBlocks) < b.blockAddr;
46}
47
48typedef list<ExtentInfo>::iterator ListExtIt;
49
50class ExtentManager {
51public:
52	ExtentManager() : blockSize(0), totalBytes(0), totalBlocks(0) {};
53	~ExtentManager() {};
54
55	void Init(uint32_t theBlockSize, uint32_t theNativeBlockSize, off_t theTotalBytes);
56
57	void AddBlockRangeExtent(off_t blockAddr, off_t numBlocks);
58	void AddByteRangeExtent(off_t byteAddr, off_t numBytes);
59	void RemoveBlockRangeExtent(off_t blockAddr, off_t numBlocks);
60
61	void DebugPrint();
62
63protected:
64	void MergeExtent(const ExtentInfo &a, const ExtentInfo &b, ExtentInfo *c);
65
66public:
67	size_t blockSize;
68	size_t nativeBlockSize;
69	off_t totalBytes;
70	off_t totalBlocks;
71	list<ExtentInfo> extentList;
72};
73
74#endif // #ifndef EXTENTMANAGER_H
75