1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/FileSystem/FileBackedFileSystem.h>
#include <Kernel/Locking/MutexProtected.h>
namespace Kernel {
class BlockBasedFileSystem : public FileBackedFileSystem {
public:
AK_TYPEDEF_DISTINCT_ORDERED_ID(u64, BlockIndex);
virtual ~BlockBasedFileSystem() override;
u64 logical_block_size() const { return m_logical_block_size; };
virtual void flush_writes() override;
void flush_writes_impl();
protected:
explicit BlockBasedFileSystem(OpenFileDescription&);
virtual ErrorOr<void> initialize_while_locked() override;
ErrorOr<void> read_block(BlockIndex, UserOrKernelBuffer*, size_t count, u64 offset = 0, bool allow_cache = true) const;
ErrorOr<void> read_blocks(BlockIndex, unsigned count, UserOrKernelBuffer&, bool allow_cache = true) const;
ErrorOr<void> raw_read(BlockIndex, UserOrKernelBuffer&);
ErrorOr<void> raw_write(BlockIndex, UserOrKernelBuffer const&);
ErrorOr<void> raw_read_blocks(BlockIndex index, size_t count, UserOrKernelBuffer&);
ErrorOr<void> raw_write_blocks(BlockIndex index, size_t count, UserOrKernelBuffer const&);
ErrorOr<void> write_block(BlockIndex, UserOrKernelBuffer const&, size_t count, u64 offset = 0, bool allow_cache = true);
ErrorOr<void> write_blocks(BlockIndex, unsigned count, UserOrKernelBuffer const&, bool allow_cache = true);
u64 m_logical_block_size { 512 };
void remove_disk_cache_before_last_unmount();
private:
DiskCache& cache() const;
void flush_specific_block_if_needed(BlockIndex index);
mutable MutexProtected<OwnPtr<DiskCache>> m_cache;
};
}
|
