72 lines
1.2 KiB
C++
72 lines
1.2 KiB
C++
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#include <algorithm>
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#include <cerrno>
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#include <cstring>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <Cache/BlockCache.h>
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#include <Device/BlockDevice.h>
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#include <Common/Exception.h>
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#include <Common/auto.h>
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using namespace Device;
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BlockCache::BlockCache(BlockDevicePointer device) :
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_device(device)
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{
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_blocks = device->blocks();
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_readOnly = device->readOnly();
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}
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BlockCache::~BlockCache()
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{
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}
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void BlockCache::write(unsigned block, const void *bp)
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{
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void *address = acquire(block);
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std::memcpy(address, bp, 512);
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release(block, true);
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}
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void BlockCache::read(unsigned block, void *bp)
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{
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void *address = acquire(block);
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std::memcpy(bp, address, 512);
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release(block, false);
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}
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BlockCachePointer BlockCache::Create(BlockDevicePointer device)
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{
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// this just calls the device virtual function to create a cache.
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if (!device) return BlockCachePointer();
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return device->createBlockCache();
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}
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void BlockCache::zeroBlock(unsigned block)
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{
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/*
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void *address = acquire(block);
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std::memset(address, 0, 512);
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release(block, true);
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*/
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uint8_t buffer[512];
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std::memset(buffer, 0, 512);
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write(block, buffer);
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}
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