private void LoadDescriptor(Stream s)
{
s.Position = 0;
byte[] header = Utilities.ReadFully(s, (int)Math.Min(Sizes.Sector, s.Length));
if (header.Length < Sizes.Sector || Utilities.ToUInt32LittleEndian(header, 0) != HostedSparseExtentHeader.VmdkMagicNumber)
{
s.Position = 0;
_descriptor = new DescriptorFile(s);
if (_access != FileAccess.Read)
{
_descriptor.ContentId = (uint)_rng.Next();
s.Position = 0;
_descriptor.Write(s);
s.SetLength(s.Position);
}
}
else
{
// This is a sparse disk extent, hopefully with embedded descriptor...
HostedSparseExtentHeader hdr = HostedSparseExtentHeader.Read(header, 0);
if (hdr.DescriptorOffset != 0)
{
Stream descriptorStream = new SubStream(s, hdr.DescriptorOffset * Sizes.Sector, hdr.DescriptorSize * Sizes.Sector);
_descriptor = new DescriptorFile(descriptorStream);
if (_access != FileAccess.Read)
{
_descriptor.ContentId = (uint)_rng.Next();
descriptorStream.Position = 0;
_descriptor.Write(descriptorStream);
byte[] blank = new byte[descriptorStream.Length - descriptorStream.Position];
descriptorStream.Write(blank, 0, blank.Length);
}
}
}
}
/// <summary>
/// Creates a new virtual disk at the specified path.
/// </summary>
/// <param name="fileLocator">The object used to locate / create the component files.</param>
/// <param name="path">The name of the VMDK to create.</param>
/// <param name="parameters">The desired parameters for the new disk.</param>
/// <returns>The newly created disk image</returns>
internal static DiskImageFile Initialize(FileLocator fileLocator, string path, DiskParameters parameters)
{
if (parameters.Capacity <= 0)
{
throw new ArgumentException("Capacity must be greater than zero", "parameters");
}
Geometry geometry = parameters.Geometry ?? DefaultGeometry(parameters.Capacity);
Geometry biosGeometry;
if (parameters.BiosGeometry != null)
{
biosGeometry = parameters.BiosGeometry;
}
else
{
biosGeometry = Geometry.MakeBiosSafe(geometry, parameters.Capacity);
}
DiskAdapterType adapterType = (parameters.AdapterType == DiskAdapterType.None) ? DiskAdapterType.LsiLogicScsi : parameters.AdapterType;
DiskCreateType createType = (parameters.CreateType == DiskCreateType.None) ? DiskCreateType.MonolithicSparse : parameters.CreateType;
DescriptorFile baseDescriptor = CreateSimpleDiskDescriptor(geometry, biosGeometry, createType, adapterType);
return(DoInitialize(fileLocator, path, parameters.Capacity, createType, baseDescriptor));
}
private static DescriptorFile CreateDifferencingDiskDescriptor(DiskCreateType type, DiskImageFile parent, string parentPath)
{
DescriptorFile baseDescriptor = new DescriptorFile();
baseDescriptor.ContentId = (uint)_rng.Next();
baseDescriptor.ParentContentId = parent.ContentId;
baseDescriptor.ParentFileNameHint = parentPath;
baseDescriptor.CreateType = type;
return(baseDescriptor);
}
internal static DescriptorFile CreateSimpleDiskDescriptor(Geometry geometry, Geometry biosGeometery, DiskCreateType createType, DiskAdapterType adapterType)
{
DescriptorFile baseDescriptor = new DescriptorFile();
baseDescriptor.DiskGeometry = geometry;
baseDescriptor.BiosGeometry = biosGeometery;
baseDescriptor.ContentId = (uint)_rng.Next();
baseDescriptor.CreateType = createType;
baseDescriptor.UniqueId = Guid.NewGuid();
baseDescriptor.HardwareVersion = "4";
baseDescriptor.AdapterType = adapterType;
return(baseDescriptor);
}
/// <summary>
/// Initiates the build process.
/// </summary>
/// <param name="baseName">The base name for the VMDK, for example 'foo' to create 'foo.vmdk'.</param>
/// <returns>A set of one or more logical files that constitute the VMDK. The first file is
/// the 'primary' file that is normally attached to VMs.</returns>
public override DiskImageFileSpecification[] Build(string baseName)
{
if (string.IsNullOrEmpty(baseName))
{
throw new ArgumentException("Invalid base file name", "baseName");
}
if (Content == null)
{
throw new InvalidOperationException("No content stream specified");
}
if (_diskType != DiskCreateType.Vmfs && _diskType != DiskCreateType.VmfsSparse)
{
throw new NotImplementedException("Only Vmfs and VmfsSparse disks implemented");
}
List <DiskImageFileSpecification> fileSpecs = new List <DiskImageFileSpecification>();
Geometry geometry = Geometry ?? DiskImageFile.DefaultGeometry(Content.Length);
Geometry biosGeometry = BiosGeometry ?? Geometry.LbaAssistedBiosGeometry(Content.Length);
DescriptorFile baseDescriptor = DiskImageFile.CreateSimpleDiskDescriptor(geometry, biosGeometry, _diskType, _adapterType);
if (_diskType == DiskCreateType.Vmfs)
{
ExtentDescriptor extent = new ExtentDescriptor(ExtentAccess.ReadWrite, Content.Length / 512, ExtentType.Vmfs, baseName + "-flat.vmdk", 0);
baseDescriptor.Extents.Add(extent);
MemoryStream ms = new MemoryStream();
baseDescriptor.Write(ms);
fileSpecs.Add(new DiskImageFileSpecification(baseName + ".vmdk", new PassthroughStreamBuilder(ms)));
fileSpecs.Add(new DiskImageFileSpecification(baseName + "-flat.vmdk", new PassthroughStreamBuilder(Content)));
}
else if (_diskType == DiskCreateType.VmfsSparse)
{
ExtentDescriptor extent = new ExtentDescriptor(ExtentAccess.ReadWrite, Content.Length / 512, ExtentType.VmfsSparse, baseName + "-sparse.vmdk", 0);
baseDescriptor.Extents.Add(extent);
MemoryStream ms = new MemoryStream();
baseDescriptor.Write(ms);
fileSpecs.Add(new DiskImageFileSpecification(baseName + ".vmdk", new PassthroughStreamBuilder(ms)));
fileSpecs.Add(new DiskImageFileSpecification(baseName + "-sparse.vmdk", new VmfsSparseExtentBuilder(Content)));
}
return(fileSpecs.ToArray());
}
/// <summary>
/// Creates a new virtual disk that is a linked clone of an existing disk.
/// </summary>
/// <param name="path">The path to the new disk</param>
/// <param name="type">The type of the new disk</param>
/// <param name="parent">The disk to clone</param>
/// <returns>The new virtual disk</returns>
public static DiskImageFile InitializeDifferencing(string path, DiskCreateType type, string parent)
{
if (type != DiskCreateType.MonolithicSparse && type != DiskCreateType.TwoGbMaxExtentSparse && type != DiskCreateType.VmfsSparse)
{
throw new ArgumentException("Differencing disks must be sparse", "type");
}
using (DiskImageFile parentFile = new DiskImageFile(parent, FileAccess.Read))
{
DescriptorFile baseDescriptor = CreateDifferencingDiskDescriptor(type, parentFile, parent);
FileLocator locator = new LocalFileLocator(Path.GetDirectoryName(path));
return(DoInitialize(locator, Path.GetFileName(path), parentFile.Capacity, type, baseDescriptor));
}
}
/// <summary>
/// Creates a new virtual disk that is a linked clone of an existing disk.
/// </summary>
/// <param name="fileSystem">The file system to create the VMDK on</param>
/// <param name="path">The path to the new disk</param>
/// <param name="type">The type of the new disk</param>
/// <param name="parent">The disk to clone</param>
/// <returns>The new virtual disk</returns>
public static DiskImageFile InitializeDifferencing(DiscFileSystem fileSystem, string path, DiskCreateType type, string parent)
{
if (type != DiskCreateType.MonolithicSparse && type != DiskCreateType.TwoGbMaxExtentSparse && type != DiskCreateType.VmfsSparse)
{
throw new ArgumentException("Differencing disks must be sparse", "type");
}
string basePath = Utilities.GetDirectoryFromPath(path);
FileLocator locator = new DiscFileLocator(fileSystem, basePath);
FileLocator parentLocator = locator.GetRelativeLocator(Utilities.GetDirectoryFromPath(parent));
using (DiskImageFile parentFile = new DiskImageFile(parentLocator, Utilities.GetFileFromPath(parent), FileAccess.Read))
{
DescriptorFile baseDescriptor = CreateDifferencingDiskDescriptor(type, parentFile, parent);
return(DoInitialize(locator, Utilities.GetFileFromPath(path), parentFile.Capacity, type, baseDescriptor));
}
}
private static DiskImageFile DoInitialize(FileLocator fileLocator, string file, long capacity, DiskCreateType type, DescriptorFile baseDescriptor)
{
if (type == DiskCreateType.MonolithicSparse)
{
// MonolithicSparse is a special case, the descriptor is embedded in the file itself...
using (Stream fs = fileLocator.Open(file, FileMode.Create, FileAccess.ReadWrite, FileShare.None))
{
long descriptorStart;
CreateExtent(fs, capacity, ExtentType.Sparse, 10 * Sizes.OneKiB, out descriptorStart);
ExtentDescriptor extent = new ExtentDescriptor(ExtentAccess.ReadWrite, capacity / Sizes.Sector, ExtentType.Sparse, file, 0);
fs.Position = descriptorStart * Sizes.Sector;
baseDescriptor.Extents.Add(extent);
baseDescriptor.Write(fs);
}
}
else
{
ExtentType extentType = CreateTypeToExtentType(type);
long totalSize = 0;
List <ExtentDescriptor> extents = new List <ExtentDescriptor>();
if (type == DiskCreateType.MonolithicFlat || type == DiskCreateType.VmfsSparse || type == DiskCreateType.Vmfs)
{
string adornment = "flat";
if (type == DiskCreateType.VmfsSparse)
{
adornment = string.IsNullOrEmpty(baseDescriptor.ParentFileNameHint) ? "sparse" : "delta";
}
string fileName = AdornFileName(file, adornment);
using (Stream fs = fileLocator.Open(fileName, FileMode.Create, FileAccess.ReadWrite, FileShare.None))
{
CreateExtent(fs, capacity, extentType);
extents.Add(new ExtentDescriptor(ExtentAccess.ReadWrite, capacity / Sizes.Sector, extentType, fileName, 0));
totalSize = capacity;
}
}
else if (type == DiskCreateType.TwoGbMaxExtentFlat || type == DiskCreateType.TwoGbMaxExtentSparse)
{
int i = 1;
while (totalSize < capacity)
{
string adornment;
if (type == DiskCreateType.TwoGbMaxExtentSparse)
{
adornment = string.Format(CultureInfo.InvariantCulture, "s{0:x3}", i);
}
else
{
adornment = string.Format(CultureInfo.InvariantCulture, "{0:x6}", i);
}
string fileName = AdornFileName(file, adornment);
using (Stream fs = fileLocator.Open(fileName, FileMode.Create, FileAccess.ReadWrite, FileShare.None))
{
long extentSize = Math.Min((2 * Sizes.OneGiB) - Sizes.OneMiB, capacity - totalSize);
CreateExtent(fs, extentSize, extentType);
extents.Add(new ExtentDescriptor(ExtentAccess.ReadWrite, extentSize / Sizes.Sector, extentType, fileName, 0));
totalSize += extentSize;
}
++i;
}
}
else
{
throw new NotSupportedException("Creating disks of this type is not supported");
}
using (Stream fs = fileLocator.Open(file, FileMode.Create, FileAccess.ReadWrite, FileShare.None))
{
baseDescriptor.Extents.AddRange(extents);
baseDescriptor.Write(fs);
}
}
return(new DiskImageFile(fileLocator, file, FileAccess.ReadWrite));
}
