IOCTL_VOLUME_ONLINE IOCTL

Brings a volume online.

Windows Server 2003 and Windows XP:  This control code is not supported for dynamic disks.

To perform this operation, call the DeviceIoControl function with the following parameters.

C++
BOOL DeviceIoControl(
  (HANDLE) hDevice,             // handle to device
  IOCTL_VOLUME_ONLINE,          // dwIoControlCode
  NULL,                         // lpInBuffer
  0,                            // nInBufferSize
  NULL,                         // lpOutBuffer
  0,                            // nOutBufferSize
  (LPDWORD) lpBytesReturned,    // number of bytes returned
  (LPOVERLAPPED) lpOverlapped   // OVERLAPPED structure
);

Major Code

IRP_MJ_DEVICE_CONTROL

Input Buffer

Input Buffer Length

Output Buffer

Output Buffer Length

Input / Output Buffer

Input / Output Buffer Length

Status Block

Irp->IoStatus.Status is set to STATUS_SUCCESS if the request is successful.

Otherwise, Status to the appropriate error condition as a NTSTATUS code.

For more information, see NTSTATUS Values.

Remarks

When a volume is offline, all read, write, and IOCTL requests fail with ERROR_NOT_READY. You cannot take the system or boot volume offline.

When a volume is online, all requests sent to the volume are honored.

When a volume that is online is dismounted, the next call to open the volume causes it to be mounted. Taking the volume offline prevents the dismounted volume from being mounted again.

To take a volume offline, use the IOCTL_VOLUME_OFFLINE control code.

In Windows 8 and Windows Server 2012, this code is supported by the following technologies.

Technology Supported
Server Message Block (SMB) 3.0 protocol No
SMB 3.0 Transparent Failover (TFO) No
SMB 3.0 with Scale-out File Shares (SO) No
Cluster Shared Volume File System (CsvFS) No

Requirements

   
Windows version Windows XP [desktop apps only] Windows Server 2003 [desktop apps only]
Header winioctl.h (include Windows.h)

See Also

DeviceIoControl

IOCTL_VOLUME_OFFLINE

Volume Management Control Codes