SCSI_PNP_REQUEST_BLOCK structure (srb.h)
TheSCSI_PNP_REQUEST_BLOCK structure is a special version of a SCSI_REQUEST_BLOCK that is used for plug and play (PNP) requests.
Syntax
typedef struct _SCSI_PNP_REQUEST_BLOCK {
USHORT Length;
UCHAR Function;
UCHAR SrbStatus;
UCHAR PnPSubFunction;
UCHAR PathId;
UCHAR TargetId;
UCHAR Lun;
STOR_PNP_ACTION PnPAction;
ULONG SrbFlags;
ULONG DataTransferLength;
ULONG TimeOutValue;
PVOID DataBuffer;
PVOID SenseInfoBuffer;
struct _SCSI_REQUEST_BLOCK *NextSrb;
PVOID OriginalRequest;
PVOID SrbExtension;
ULONG SrbPnPFlags;
ULONG Reserved;
UCHAR Reserved4[16];
} SCSI_PNP_REQUEST_BLOCK, *PSCSI_PNP_REQUEST_BLOCK;
Members
Length
The size, in bytes, of the SCSI_PNP_REQUEST_BLOCK structure.
Function
The operation to perform. For the SCSI_PNP_REQUEST_BLOCK structure, this member is always set to SRB_FUNCTION_PNP.
SrbStatus
The status of the completed request. The miniport driver should set this value before notifying the Storport driver that the request has completed. A miniport driver notifies the Storport driver that the request has completed by calling the StorPortNotification routine with a notification type of RequestComplete. For a list of possible status values, see SCSI_REQUEST_BLOCK.
PnPSubFunction
This member is not currently used. Miniport drivers ignore this member.
PathId
The SCSI port or bus identifier for the request. This value is zero based.
TargetId
The target controller or device identifier on the bus.
Lun
The logical unit number (LUN) of the device.
PnPAction
The plug and play action to perform. This member can have one of the following values:
SrbFlags
Miniport driver should ignore this member.
DataTransferLength
Miniport driver should ignore this member.
TimeOutValue
The interval, in seconds, that the request can execute before the Storport driver determines that the request has timed out.
DataBuffer
Miniport driver should ignore this member.
SenseInfoBuffer
Miniport driver should ignore this member.
NextSrb
Miniport driver should ignore this member.
OriginalRequest
Miniport driver should ignore this member.
SrbExtension
A pointer to the SRB extension. A miniport driver must not use this member if it set SrbExtensionSize to zero in the HW_INITIALIZATION_DATA structure. The Storport driver does not initialize the memory that this member points to. The HBA can directly access the data that the miniport driver writes into the SRB extension. A miniport driver can obtain the physical address of the SRB extension by calling the StorPortGetPhysicalAddress routine.
SrbPnPFlags
The PNP flags. Currently, the only flag allowed is SRB_PNP_FLAGS_ADAPTER_REQUEST, which indicates that the PNP request is for the adapter, and not for one of the devices on the adapter. If this flag is set, the miniport driver should ignore the values in the PathId, TargetId, and Lun.
Reserved
Reserved for system use.
Reserved4[16]
Reserved for system use.
Remarks
The Storport driver sends SCSI_PNP_REQUEST_BLOCK requests to a miniport driver to notify the miniport driver of Windows plug and play events that affect storage devices that are connected to the adapter.
The Storport driver calls HwStorBuildIo to pass SRBs to the miniport driver. HwStorBuildIo checks the Function member of the SRB to determine the type of the SRB. If the Function member is set to SRB_FUNCTION_PNP, the SRB is a structure of type SCSI_PNP_REQUEST_BLOCK.
Requirements
| Requirement | Value |
|---|---|
| Header | srb.h (include Storport.h, Minitape.h, Srb.h) |