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Union component used when the MajorFunction field of the FLT_IO_PARAMETER_BLOCK structure for the operation is IRP_MJ_QUERY_VOLUME_INFORMATION.
Syntax
typedef union _FLT_PARAMETERS {
... ;
struct {
ULONG Length;
FS_INFORMATION_CLASS POINTER_ALIGNMENT FsInformationClass;
} QueryVolumeInformation;
PVOID VolumeBuffer;
... ;
} FLT_PARAMETERS, *PFLT_PARAMETERS;
Members
QueryVolumeInformation: Structure containing the following members.
Length: Length, in bytes, of the buffer at VolumeBuffer.
FsInformationClass: Type of volume information that the file system returns. One of the following:
Value Meaning FileFsAttributeInformation Return a FILE_FS_VOLUME_INFORMATION that contains information about the volume, such as the volume label, serial number, and creation time. FileFsControlInformation Return a FILE_FS_CONTROL_INFORMATION structure that contains file system control information about the volume. FileFsDeviceInformation Return a FILE_FS_DEVICE_INFORMATION structure that contains device information for the volume. FileFsDriverPathInformation Return a FILE_FS_DRIVER_PATH_INFORMATION structure that contains information about whether a specified driver is in the I/O path for the volume. The originator of the IRP_MJ_QUERY_VOLUME_INFORMATION request must store the name of the driver into the FILE_FS_DRIVER_PATH_INFORMATION structure before sending the IRP to the file system volume device stack. FileFsFullSizeInformation Return a FILE_FS_FULL_SIZE_INFORMATION structure that contains information about the total amount of space available on the volume. FileFsObjectIdInformation Return a FILE_FS_OBJECTID_INFORMATION structure that contains file-system-specific object ID information for the volume. Note that this is not the same as the (globally unique identifier [GUID]-based) unique volume name that the operating system assigns. FileFsSizeInformation Return a FILE_FS_SIZE_INFORMATION structure that contains information about the amount of space on the volume that is available to the user associated with the thread that originated the IRP_MJ_QUERY_VOLUME_INFORMATION request. FileFsVolumeInformation Return a FILE_FS_VOLUME_INFORMATION that contains information about the volume, such as the volume label, serial number, and creation time. FileFsSectorSizeInformation Return a FILE_FS_SECTOR_SIZE_INFORMATION structure that contains information about the physical and logical sector sizes of a volume. VolumeBuffer: Pointer to the output buffer where the volume information is to be returned.
Remarks
The FLT_PARAMETERS structure for IRP_MJ_QUERY_VOLUME_INFORMATION operations contains the parameters for an IRP-based query-volume-information operation represented by a callback data (FLT_CALLBACK_DATA) structure. It is contained in an FLT_IO_PARAMETER_BLOCK structure.
IRP_MJ_QUERY_VOLUME_INFORMATION is an IRP-based operation.
Requirements
| Requirement type | Requirement |
|---|---|
| Header | Fltkernel.h (include Fltkernel.h) |
See also
FILE_FS_DRIVER_PATH_INFORMATION
FILE_FS_SECTOR_SIZE_INFORMATION FILE_FS_SIZE_INFORMATION