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67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013, 2014, 2015.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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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, bool write);
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~Device();
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public:
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pthread_t sync_thread;
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pthread_cond_t sync_thread_cond;
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pthread_cond_t sync_thread_idle_cond;
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pthread_mutex_t sync_thread_lock;
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Block* mru_block;
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Block* lru_block;
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Block* dirty_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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bool write;
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bool has_sync_thread;
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bool sync_thread_should_exit;
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bool sync_in_transit;
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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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void SpawnSyncThread();
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Block* AllocateBlock();
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Block* GetBlock(uint32_t block_id);
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Block* GetBlockZeroed(uint32_t block_id);
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Block* GetCachedBlock(uint32_t block_id);
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void Sync();
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void SyncThread();
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};
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#endif
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