e279b45aed
This way, if something goes wrong, we get to keep the actual error. Also, KResults are nodiscard, so we have to deal with that in Ext2FS instead of just silently ignoring I/O errors(!)
66 lines
2.7 KiB
C++
66 lines
2.7 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/FileBackedFileSystem.h>
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namespace Kernel {
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class BlockBasedFS : public FileBackedFS {
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public:
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virtual ~BlockBasedFS() override;
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size_t 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 BlockBasedFS(FileDescription&);
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KResult read_block(unsigned index, UserOrKernelBuffer* buffer, size_t count, size_t offset = 0, bool allow_cache = true) const;
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KResult read_blocks(unsigned index, unsigned count, UserOrKernelBuffer& buffer, bool allow_cache = true) const;
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bool raw_read(unsigned index, UserOrKernelBuffer& buffer);
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bool raw_write(unsigned index, const UserOrKernelBuffer& buffer);
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bool raw_read_blocks(unsigned index, size_t count, UserOrKernelBuffer& buffer);
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bool raw_write_blocks(unsigned index, size_t count, const UserOrKernelBuffer& buffer);
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KResult write_block(unsigned index, const UserOrKernelBuffer& buffer, size_t count, size_t offset = 0, bool allow_cache = true);
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KResult write_blocks(unsigned index, unsigned count, const UserOrKernelBuffer&, bool allow_cache = true);
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size_t 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(unsigned index);
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mutable OwnPtr<DiskCache> m_cache;
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};
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}
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