[MS-VDS]: Virtual Disk Service (VDS) Protocol Specification

At any point in the preceding sequence before the percentage completed value in the async object is100, the server MUST update the percentage completed value if forward progress is made duringthe merge operation.3.4.5.2.39.6 IVdsOpenVDisk::Expand (Opnum 8)The Expand method increases the size of a virtual disk. Expanding a virtual disk requires that thevirtual disk be detached during the operation. The virtual disk file must be opened with READ|WRITEprivileges using the IVdsVDisk::Open method.HRESULT Expand([in] EXPAND_VIRTUAL_DISK_FLAG Flags,[in] ULONGLONG NewSize,[out] IVdsAsync** ppAsync);Flags: An EXPAND_VIRTUAL_DISK_FLAG (section 2.2.2.19.1.5) enumeration value thatspecifies how the virtual disk is to be compacted.NewSize: The desired size, in bytes, of the expanded virtual disk.ppAsync: A pointer to an IVdsAsync (section 3.1.3.1) interface that, if the operation issuccessfully completed, receives the IVdsAsync interface to monitor and control thisoperation. Callers MUST release the interface when they are done with it.Return Values: The method MUST return zero to indicate success, or return an implementationspecificnonzero error code to indicate failure.When the server receives this message, it MUST validate the following parameters:•Verify that Flags is a bitwise OR of values from the EXPAND_VIRTUAL_DISK_FLAGenumeration.•Verify that ppAsync is not NULL.The server MUST perform the following:•Create a new async object implementing the IVdsAsync interface with an output type ofVDS_ASYNCOUT_EXPAND_VDISK and set the pointer ppAsync to the interface.•Return an HRESULT indicating failure or success. Any errors encountered up through this pointin processing the operation are returned in this HRESULT.The server MUST then perform the following in sequence. Errors generated in this sequence of stepsare returned in the pHrResult parameter to the IVdsAsync::Wait or IVdsAsyncQueryStatus methods.•Pass the input parameters to the operating system to expand the disk.•Set the return code in the async object to an HRESULT indicating failure or success of theoperating system.•If the task completed successfully, set the percentage completed value in the async object to100.•Set the signal state in the async object to TRUE.[MS-VDS] — v20110610Virtual Disk Service (VDS) Protocol SpecificationCopyright © 2011 Microsoft Corporation.Release: Friday, June 10, 2011275 / 360