IOCTL_MOUNTDEV_QUERY_DEVICE_NAME IOCTL (mountmgr.h)
Upon receiving this IOCTL a client driver must provide the (nonpersistent) device (or target) name for the volume. The mount manager uses the device name returned by the client as the target of a symbolic link. An example of a device name would be "\Device\HarddiskVolume1".
Support for this IOCTL by the mount manager clients is mandatory.
Major code
Input buffer
None.
Input buffer length
None.
Output buffer
The mount manager client returns a variable-length structure of type MOUNTDEV_NAME at the beginning of the buffer at Irp->AssociatedIrp.SystemBuffer. The device name must be inserted at the address pointed to by the Name member of this structure.
Output buffer length
Parameters.DeviceIoControl.OutputBufferLength in the I/O stack location of the IRP indicates the size, in bytes, of the output buffer, which must be greater than or equal to sizeof(MOUNTDEV_NAME).
Status block
The Information field is set to FIELD_OFFSET(MOUNTDEV_NAME, Name) + output->NameLength, or alternatively, output->NameLength + sizeof(USHORT), where output points to the buffer at Irp->AssociatedIrp.SystemBuffer.
If the operation is successful, the mount manager client must set the Information field to the length of the NULL-terminated string containing the device name and the Status field to STATUS_SUCCESS.
If the output buffer is too small to hold the device name, the mount manager client must set the Information field to sizeof(MOUNTDEV_NAME) and the Status field to STATUS_BUFFER_OVERFLOW. In addition, the mount manager client fills in the NameLength member of the MOUNTDEV_NAME structure.
Remarks
As a best practice, the implementer must not thread-synchronize and must not make blocking and/or Interprocess Communication (IPC) function calls.
For more information, see Supporting Mount Manager Requests in a Storage Class Driver.
Requirements
| Requirement | Value |
|---|---|
| Header | mountmgr.h (include Mountmgr.h) |