status_t
Volume::ClusterToBlock(cluster_t cluster, fsblock_t &block)
{
if (cluster < 2)
return B_BAD_VALUE;
block = ((cluster - 2) << SuperBlock().BlocksPerClusterShift())
+ SuperBlock().FirstDataBlock();
TRACE("Volume::ClusterToBlock() cluster %" B_PRIu32 " %u %" B_PRIu32 ": %"
B_PRIu64 ", %" B_PRIu32 "\n", cluster,
SuperBlock().BlocksPerClusterShift(), SuperBlock().FirstDataBlock(),
block, SuperBlock().FirstFatBlock());
return B_OK;
}
cluster_t
Volume::NextCluster(cluster_t _cluster)
{
uint32 clusterPerBlock = fBlockSize / sizeof(cluster_t);
CachedBlock block(this);
fsblock_t blockNum = SuperBlock().FirstFatBlock()
+ _cluster / clusterPerBlock;
cluster_t *cluster = (cluster_t *)block.SetTo(blockNum);
cluster += _cluster % clusterPerBlock;
TRACE("Volume::NextCluster() cluster %" B_PRIu32 " next %" B_PRIu32 "\n",
_cluster, *cluster);
return *cluster;
}
bool DiskMultiMap::createNew(const std::string &filename, unsigned int numBuckets) {
m_superBlock = SuperBlock(numBuckets);
if (!m_file.createNew(filename)) {
return false;
}
if (!m_file.write(m_superBlock, 0)) {
return false;
}
for (int i = 0; i < numBuckets; i++) {
BinaryFile::Offset emptyOffset = NULLOFFSET;
if (!m_file.write(emptyOffset, (BinaryFile::Offset) (i * sizeof(BinaryFile::Offset) + sizeof(SuperBlock)))) {
return false;
}
}
return true;
}
