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IOCTL_EHSTOR_DEVICE_GET_QUEUE_STATE IOCTL (ehstorioctl.h)

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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

IRP_MJ_DEVICE_CONTROL

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)

See also

IOCTL_EHSTOR_DEVICE_SET_QUEUE_STATE