status_t
Header::Write(int fd)
{
// Try to write the protective MBR
PartitionMap partitionMap;
PrimaryPartition *partition = NULL;
uint32 index = 0;
while ((partition = partitionMap.PrimaryPartitionAt(index)) != NULL) {
if (index == 0) {
uint64 deviceSize = fHeader.AlternateBlock() * fBlockSize;
partition->SetTo(fBlockSize, deviceSize, 0xEE, false, fBlockSize);
} else
partition->Unset();
++index;
}
PartitionMapWriter writer(fd, fBlockSize);
writer.WriteMBR(&partitionMap, true);
// We also write the bootcode, so we can boot GPT disks from BIOS
status_t status = _Write(fd, fHeader.EntriesBlock() * fBlockSize, fEntries,
_EntryArraySize());
if (status != B_OK)
return status;
// First write the header, so that we have at least one completely correct
// data set
status = _WriteHeader(fd);
// Write backup entries
status_t backupStatus = _Write(fd,
fBackupHeader.EntriesBlock() * fBlockSize, fEntries, _EntryArraySize());
return status == B_OK ? backupStatus : status;
}
// _ParsePrimary
status_t
PartitionMapParser::_ParsePrimary(const partition_table* table,
bool& hadToReFitSize)
{
if (table == NULL)
return B_BAD_VALUE;
// check the signature
if (table->signature != kPartitionTableSectorSignature) {
TRACE(("intel: _ParsePrimary(): invalid PartitionTable signature: %lx\n",
(uint32)table->signature));
return B_BAD_DATA;
}
hadToReFitSize = false;
// examine the table
for (int32 i = 0; i < 4; i++) {
const partition_descriptor* descriptor = &table->table[i];
PrimaryPartition* partition = fMap->PrimaryPartitionAt(i);
partition->SetTo(descriptor, 0, fBlockSize);
// work-around potential BIOS/OS problems
hadToReFitSize |= partition->FitSizeToSession(fSessionSize);
// ignore, if location is bad
if (!partition->CheckLocation(fSessionSize)) {
TRACE(("intel: _ParsePrimary(): partition %ld: bad location, "
"ignoring\n", i));
partition->Unset();
}
}
// allocate a partition_table buffer
fPartitionTable = new(nothrow) partition_table;
if (fPartitionTable == NULL)
return B_NO_MEMORY;
// parse extended partitions
status_t error = B_OK;
for (int32 i = 0; error == B_OK && i < 4; i++) {
PrimaryPartition* primary = fMap->PrimaryPartitionAt(i);
if (primary->IsExtended())
error = _ParseExtended(primary, primary->Offset());
}
// cleanup
delete fPartitionTable;
fPartitionTable = NULL;
return error;
}