955e11bc28
Encapsulate file descriptor into an object, to ensure that an fd will be closed properly while exception raised, e.g., the block_cache throws exception during the block_manager's construction.
52 lines
1.0 KiB
C++
52 lines
1.0 KiB
C++
#ifndef THIN_PROVISIONING_CACHE_STREAM_H
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#define THIN_PROVISIONING_CACHE_STREAM_H
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#include "thin-provisioning/chunk_stream.h"
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//----------------------------------------------------------------
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namespace thin_provisioning {
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using namespace bcache;
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class cache_stream : public chunk_stream {
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public:
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cache_stream(std::string const &path,
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block_address block_size,
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size_t cache_mem);
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block_address size() const;
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virtual void rewind();
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virtual bool next(block_address count = 1ull);
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virtual bool eof() const;
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virtual chunk const &get();
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virtual void put(chunk const &c);
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private:
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struct chunk_wrapper {
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chunk_wrapper(cache_stream &parent);
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block_cache::auto_block block_;
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chunk c_;
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};
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friend class chunk_wrapper;
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block_address block_size_;
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block_address nr_blocks_;
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block_address cache_blocks_;
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file_utils::file_descriptor fd_;
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validator::ptr v_;
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std::unique_ptr<block_cache> cache_;
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block_address current_index_;
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};
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}
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//----------------------------------------------------------------
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#endif
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