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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#pragma once
28
29#include <AK/RefPtr.h>
30#include <Kernel/Devices/BlockDevice.h>
31
32namespace Kernel {
33
34class DiskPartition final : public BlockDevice {
35public:
36 static NonnullRefPtr<DiskPartition> create(BlockDevice&, unsigned block_offset, unsigned block_limit);
37 virtual ~DiskPartition();
38
39 virtual bool read_blocks(unsigned index, u16 count, u8*) override;
40 virtual bool write_blocks(unsigned index, u16 count, const u8*) override;
41
42 // ^BlockDevice
43 virtual ssize_t read(FileDescription&, u8*, ssize_t) override { return 0; }
44 virtual bool can_read(const FileDescription&) const override { return true; }
45 virtual ssize_t write(FileDescription&, const u8*, ssize_t) override { return 0; }
46 virtual bool can_write(const FileDescription&) const override { return true; }
47
48private:
49 virtual const char* class_name() const override;
50
51 DiskPartition(BlockDevice&, unsigned block_offset, unsigned block_limit);
52
53 NonnullRefPtr<BlockDevice> m_device;
54 unsigned m_block_offset;
55 unsigned m_block_limit;
56};
57
58}