FltCheckLockForWriteAccess function (fltkernel.h)

The FltCheckLockForWriteAccess routine determines whether the caller has write access to a locked byte range of a file.

Syntax

BOOLEAN FLTAPI FltCheckLockForWriteAccess(
  [in] PFILE_LOCK         FileLock,
  [in] PFLT_CALLBACK_DATA CallbackData
);

Parameters

[in] FileLock

Pointer to the FILE_LOCK structure for the file. This structure must have been initialized by a previous call to FltAllocateFileLock or FltInitializeFileLock.

[in] CallbackData

Pointer to the callback data (FLT_CALLBACK_DATA) structure for the IRP_MJ_WRITE operation.

Return value

FltCheckLockForWriteAccess returns TRUE if the process has write access, FALSE otherwise.

Remarks

FltCheckLockForWriteAccess checks whether the caller has write access to the entire byte range indicated in the callback data structure.

FltCheckLockForWriteAccess does not complete the IRP_MJ_READ operation.

To allocate and initialize a new file lock structure, call FltAllocateFileLock.

To free an initialized FILE_LOCK structure, call FltFreeFileLock.

Requirements

See also

FLT_CALLBACK_DATA

FltAllocateFileLock

FltCheckLockForReadAccess

FltFreeFileLock

FltInitializeFileLock

FltProcessFileLock

FltUninitializeFileLock

FsRtlCheckLockForWriteAccess

IRP_MJ_WRITE