private int CompareSegments(MetadataSegmentSection x, MetadataSegmentSection y)
{
if (x.StartExtent > y.StartExtent)
{
return(1);
}
else if (x.StartExtent < y.StartExtent)
{
return(-1);
}
return(0);
}
private SparseStream OpenSegment(MetadataSegmentSection segment)
{
if (segment.Stripes.Length != 1)
{
throw new IOException("invalid number of stripes");
}
var stripe = segment.Stripes[0];
PhysicalVolume pv;
if (!_pvs.TryGetValue(stripe.PhysicalVolumeName, out pv))
{
throw new IOException("missing pv");
}
if (pv.PvHeader.DiskAreas.Length != 1)
{
throw new IOException("invalid number od pv data areas");
}
var dataArea = pv.PvHeader.DiskAreas[0];
var start = dataArea.Offset + (stripe.StartExtentNumber * _extentSize * PhysicalVolume.SECTOR_SIZE);
var length = segment.ExtentCount * _extentSize * PhysicalVolume.SECTOR_SIZE;
return(new SubStream(pv.Content, Ownership.None, (long)start, (long)length));
}
internal void Parse(string head, TextReader data)
{
var segments = new List <MetadataSegmentSection>();
Name = head.Trim().TrimEnd('{').TrimEnd();
string line;
while ((line = Metadata.ReadLine(data)) != null)
{
if (line == String.Empty)
{
continue;
}
if (line.Contains("="))
{
var parameter = Metadata.ParseParameter(line);
switch (parameter.Key.Trim().ToLowerInvariant())
{
case "id":
Id = Metadata.ParseStringValue(parameter.Value);
byte[] guid = new byte[16];
EndianUtilities.StringToBytes(Id.Replace("-", String.Empty), guid, 0, 16);
// Mark it as a version 4 GUID
guid[7] = (byte)((guid[7] | (byte)0x40) & (byte)0x4f);
guid[8] = (byte)((guid[8] | (byte)0x80) & (byte)0xbf);
Identity = new Guid(guid);
break;
case "status":
var values = Metadata.ParseArrayValue(parameter.Value);
foreach (var value in values)
{
switch (value.ToLowerInvariant().Trim())
{
case "read":
Status |= LogicalVolumeStatus.Read;
break;
case "write":
Status |= LogicalVolumeStatus.Write;
break;
case "visible":
Status |= LogicalVolumeStatus.Visible;
break;
default:
throw new ArgumentOutOfRangeException("status", "Unexpected status in physical volume metadata");
}
}
break;
case "flags":
Flags = Metadata.ParseArrayValue(parameter.Value);
break;
case "creation_host":
CreationHost = Metadata.ParseStringValue(parameter.Value);
break;
case "creation_time":
CreationTime = Metadata.ParseDateTimeValue(parameter.Value);
break;
case "segment_count":
SegmentCount = Metadata.ParseNumericValue(parameter.Value);
break;
default:
throw new ArgumentOutOfRangeException(parameter.Key, "Unexpected parameter in global metadata");
}
}
else if (line.EndsWith("{"))
{
var segment = new MetadataSegmentSection();
segment.Parse(line, data);
segments.Add(segment);
}
else if (line.EndsWith("}"))
{
break;
}
else
{
throw new ArgumentOutOfRangeException(line, "unexpected input");
}
}
Segments = segments.ToArray();
}