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/*
* 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:
TYPEDEF_DISTINCT_ORDERED_ID(u64, BlockIndex);
virtual ~BlockBasedFileSystem() override;
virtual ErrorOr<void> initialize() override;
u64 logical_block_size() const { return m_logical_block_size; };
virtual void flush_writes() override;
void flush_writes_impl();
protected:
explicit BlockBasedFileSystem(OpenFileDescription&);
ErrorOr<void> read_block(BlockIndex, UserOrKernelBuffer*, size_t count, size_t 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, const UserOrKernelBuffer&);
ErrorOr<void> raw_read_blocks(BlockIndex index, size_t count, UserOrKernelBuffer&);
ErrorOr<void> raw_write_blocks(BlockIndex index, size_t count, const UserOrKernelBuffer&);
ErrorOr<void> write_block(BlockIndex, const UserOrKernelBuffer&, size_t count, size_t offset = 0, bool allow_cache = true);
ErrorOr<void> write_blocks(BlockIndex, unsigned count, const UserOrKernelBuffer&, bool allow_cache = true);
u64 m_logical_block_size { 512 };
private:
DiskCache& cache() const;
void flush_specific_block_if_needed(BlockIndex index);
mutable MutexProtected<OwnPtr<DiskCache>> m_cache;
};
}
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