1044b29a1d
dev/disk_image.cc:
dev/disk_image.hh:
Serialization of cow images
--HG--
extra : convert_revision : 144179b8cad00b32df8c448a8556a465e24737aa
133 lines
4.1 KiB
C++
133 lines
4.1 KiB
C++
/*
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* Copyright (c) 2003 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* @file
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* Disk Image Interfaces
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*/
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#ifndef __DISK_IMAGE_HH__
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#define __DISK_IMAGE_HH__
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#include <fstream>
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#include "base/hashmap.hh"
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#include "sim/sim_object.hh"
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#define SectorSize (512)
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/*
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* Basic interface for accessing a disk image.
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*/
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class DiskImage : public SimObject
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{
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protected:
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bool initialized;
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public:
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DiskImage(const std::string &name) : SimObject(name), initialized(false) {}
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virtual ~DiskImage() {}
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virtual off_t size() const = 0;
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virtual off_t read(uint8_t *data, off_t offset) const = 0;
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virtual off_t write(const uint8_t *data, off_t offset) = 0;
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};
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/*
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* Specialization for accessing a raw disk image
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*/
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class RawDiskImage : public DiskImage
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{
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protected:
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mutable std::fstream stream;
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std::string file;
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bool readonly;
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mutable off_t disk_size;
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public:
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RawDiskImage(const std::string &name, const std::string &filename,
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bool rd_only);
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~RawDiskImage();
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void close();
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void open(const std::string &filename, bool rd_only = false);
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virtual off_t size() const;
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virtual off_t read(uint8_t *data, off_t offset) const;
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virtual off_t write(const uint8_t *data, off_t offset);
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};
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/*
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* Specialization for accessing a copy-on-write disk image layer.
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* A copy-on-write(COW) layer must be stacked on top of another disk
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* image layer this layer can be another CowDiskImage, or a
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* RawDiskImage.
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*
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* This object is designed to provide a mechanism for persistant
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* changes to a main disk image, or to provide a place for temporary
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* changes to the image to take place that later may be thrown away.
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*/
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class CowDiskImage : public DiskImage
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{
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public:
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static const int VersionMajor;
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static const int VersionMinor;
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protected:
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struct Sector {
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uint8_t data[SectorSize];
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};
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typedef m5::hash_map<uint64_t, Sector *> SectorTable;
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protected:
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std::string filename;
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DiskImage *child;
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SectorTable *table;
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public:
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CowDiskImage(const std::string &name, DiskImage *kid, int hash_size);
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CowDiskImage(const std::string &name, DiskImage *kid, int hash_size,
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const std::string &filename, bool read_only);
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~CowDiskImage();
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void init(int hash_size);
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bool open(const std::string &file);
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void save();
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void save(const std::string &file);
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void writeback();
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void serialize(std::ostream &os);
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void unserialize(Checkpoint *cp, const std::string §ion);
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virtual off_t size() const;
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virtual off_t read(uint8_t *data, off_t offset) const;
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virtual off_t write(const uint8_t *data, off_t offset);
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};
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#endif // __DISK_IMAGE_HH__
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