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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <Kernel/FileSystem/FileBackedFileSystem.h>
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#include <Kernel/Locking/MutexProtected.h>
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namespace Kernel {
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class BlockBasedFileSystem : public FileBackedFileSystem {
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public:
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TYPEDEF_DISTINCT_ORDERED_ID(u64, BlockIndex);
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virtual ~BlockBasedFileSystem() override;
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virtual ErrorOr<void> initialize() override;
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u64 logical_block_size() const { return m_logical_block_size; };
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virtual void flush_writes() override;
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void flush_writes_impl();
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protected:
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explicit BlockBasedFileSystem(OpenFileDescription&);
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ErrorOr<void> read_block(BlockIndex, UserOrKernelBuffer*, size_t count, size_t offset = 0, bool allow_cache = true) const;
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ErrorOr<void> read_blocks(BlockIndex, unsigned count, UserOrKernelBuffer&, bool allow_cache = true) const;
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bool raw_read(BlockIndex, UserOrKernelBuffer&);
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bool raw_write(BlockIndex, const UserOrKernelBuffer&);
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bool raw_read_blocks(BlockIndex index, size_t count, UserOrKernelBuffer&);
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bool raw_write_blocks(BlockIndex index, size_t count, const UserOrKernelBuffer&);
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ErrorOr<void> write_block(BlockIndex, const UserOrKernelBuffer&, size_t count, size_t offset = 0, bool allow_cache = true);
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ErrorOr<void> write_blocks(BlockIndex, unsigned count, const UserOrKernelBuffer&, bool allow_cache = true);
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u64 m_logical_block_size { 512 };
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private:
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DiskCache& cache() const;
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void flush_specific_block_if_needed(BlockIndex index);
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mutable MutexProtected<OwnPtr<DiskCache>> m_cache;
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};
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}
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