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https://github.com/SerenityOS/serenity
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88e23113ae
read_block() and write_block() now accept the count (how many bytes to read or write) and offset (where in the block to start; defaults to 0). Using these new APIs, we can avoid doing copies between intermediary buffers in a lot more cases. Hopefully this improves performance or something.
78 lines
3 KiB
C++
78 lines
3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/Forward.h>
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namespace Kernel {
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class FileBackedFS : public FS {
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public:
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virtual ~FileBackedFS() override;
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File& file() { return m_file_description->file(); }
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FileDescription& file_description() { return *m_file_description; }
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const File& file() const { return m_file_description->file(); }
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const FileDescription& file_description() const { return *m_file_description; }
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virtual void flush_writes() override;
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void flush_writes_impl();
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size_t logical_block_size() const { return m_logical_block_size; };
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protected:
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explicit FileBackedFS(FileDescription&);
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bool read_block(unsigned index, u8* buffer, size_t count, size_t offset = 0, bool allow_cache = true) const;
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bool read_blocks(unsigned index, unsigned count, u8* buffer, bool allow_cache = true) const;
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bool raw_read(unsigned index, u8* buffer);
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bool raw_write(unsigned index, const u8* buffer);
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bool raw_read_blocks(unsigned index, size_t count, u8* buffer);
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bool raw_write_blocks(unsigned index, size_t count, const u8* buffer);
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bool write_block(unsigned index, const u8* buffer, size_t count, size_t offset = 0, bool allow_cache = true);
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bool write_blocks(unsigned index, unsigned count, const u8*, bool allow_cache = true);
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size_t m_logical_block_size { 512 };
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private:
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virtual bool is_file_backed() const override { return true; }
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DiskCache& cache() const;
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void flush_specific_block_if_needed(unsigned index);
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mutable NonnullRefPtr<FileDescription> m_file_description;
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mutable OwnPtr<DiskCache> m_cache;
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};
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}
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