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The following union component is used when the MajorFunction field of the FLT_IO_PARAMETER_BLOCK structure for the operation is IRP_MJ_FAST_IO_CHECK_IF_POSSIBLE.
Syntax
typedef union _FLT_PARAMETERS {
... ;
struct {
LARGE_INTEGER FileOffset;
ULONG Length;
ULONG POINTER_ALIGNMENT LockKey;
BOOLEAN POINTER_ALIGNMENT CheckForReadOperation;
} FastIoCheckIfPossible;
... ;
} FLT_PARAMETERS, *PFLT_PARAMETERS;
Members
FastIoCheckIfPossible: Structure containing the following members.
FileOffset: Starting byte offset within the cached file.
Length: Length, in bytes, of the data to be read or written.
LockKey: Key value associated with a byte-range lock on the target file. If the range to be read or written overlaps or is a subrange of a nonexclusively locked range within the file, this parameter must be the key for that shared lock. The shared lock must be held by the parent process of the calling thread; otherwise, this parameter is ignored.
CheckForReadOperation: Specifies whether this operation is to check for a read or write operation. It is set to TRUE for a read operation and FALSE for a write operation.
Remarks
The FLT_PARAMETERS structure for IRP_MJ_FAST_IO_CHECK_IF_POSSIBLE operations contains the parameters for a FastIoCheckIfPossible operation represented by a callback data (FLT_CALLBACK_DATA) structure. It is contained in an FLT_IO_PARAMETER_BLOCK structure.
IRP_MJ_FAST_IO_CHECK_IF_POSSIBLE is a fast I/O operation.
Requirements
| Requirement type | Requirement |
|---|---|
| Header | Fltkernel.h (include Fltkernel.h) |