IOCTL_EHSTOR_DEVICE_GET_QUEUE_STATE IOCTL (ehstorioctl.h)
The IOCTL_EHSTOR_DEVICE_GET_QUEUE_STATE request is sent by silo drivers and applications to determine the state of a storage device queue. IO requests in the storage device queue are held when the device is temporarily unauthorized. A storage device may become temporarily unauthorized in low power states or when there is a policy that requires locking Enhanced Storage devices such as when the user session is locked.
Major code
Input buffer
None.
Input buffer length
None.
Output buffer
The output buffer at Irp->AssociatedIrp.SystemBuffer contains an ACT_QUEUE_STATE structure. ACT_QUEUE_STATE is declared in ehstorioctl.h as the following.
typedef struct tagACT_QUEUE_STATE
{
BOOLEAN fFrozen;
} ACT_QUEUE_STATE;
Output buffer length
The length of an ACT_QUEUE_STATE structure.
Status block
One of the following values can be returned in the Status field.
| Status Value | Description |
|---|---|
| STATUS_SUCCESS | The queue state was returned successfully. |
| STATUS_BUFFER_TOO_SMALL | The output buffer length is too small. |
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available starting with Windows 8 |
| Header | ehstorioctl.h (include EhStorIoctl.h) |