52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
/*
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* Copyright (c) 2013, 2014, 2015, 2022 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* device.h
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* Block device.
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*/
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#ifndef DEVICE_H
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#define DEVICE_H
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class Block;
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static const size_t DEVICE_HASH_LENGTH = 1 << 16;
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class Device
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{
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public:
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Device(int fd, const char* path, uint32_t block_size);
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~Device();
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public:
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Block* mru_block;
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Block* lru_block;
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Block* hash_blocks[DEVICE_HASH_LENGTH];
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off_t device_size;
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const char* path;
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uint32_t block_size;
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int fd;
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size_t block_count;
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size_t block_limit;
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public:
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Block* AllocateBlock();
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Block* GetBlock(uint32_t block_id);
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Block* GetCachedBlock(uint32_t block_id);
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};
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#endif
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