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https://github.com/SerenityOS/serenity
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222acc9d38
There's not much use in having this function, as the only remotely useful thing that it does is that it ensures that the disk cache is locked before destroying it. However, there shouldn't be any filesystem activity this late in the unmounting process anyway, so the locking doesn't seem necessary either.
51 lines
1.6 KiB
C++
51 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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AK_TYPEDEF_DISTINCT_ORDERED_ID(u64, BlockIndex);
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virtual ~BlockBasedFileSystem() override;
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u64 device_block_size() const { return m_device_block_size; }
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virtual ErrorOr<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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virtual ErrorOr<void> initialize_while_locked() override;
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ErrorOr<void> read_block(BlockIndex, UserOrKernelBuffer*, size_t count, u64 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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ErrorOr<void> raw_read(BlockIndex, UserOrKernelBuffer&);
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ErrorOr<void> raw_write(BlockIndex, UserOrKernelBuffer const&);
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ErrorOr<void> raw_read_blocks(BlockIndex index, size_t count, UserOrKernelBuffer&);
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ErrorOr<void> raw_write_blocks(BlockIndex index, size_t count, UserOrKernelBuffer const&);
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ErrorOr<void> write_block(BlockIndex, UserOrKernelBuffer const&, size_t count, u64 offset = 0, bool allow_cache = true);
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ErrorOr<void> write_blocks(BlockIndex, unsigned count, UserOrKernelBuffer const&, bool allow_cache = true);
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u64 m_device_block_size { 512 };
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private:
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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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