// ntifs.h

BOOLEAN FsRtlCheckLockForOplockRequest(
  [in] PFILE_LOCK     FileLock,
  [in] PLARGE_INTEGER AllocationSize
);
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Windows Driver Kit DDI reference (nf-ntifs-_fsrtl_advanced_fcb_header-fsrtlchecklockforoplockrequest)

FsRtlCheckLockForOplockRequest function

Description

The FsRtlCheckLockForOplockRequest routine checks for locks within the allocation size of a file. The file lock object is checked for the presence of byte range locks that would prevent an oplock request from being granted.

Parameters

`FileLock` [in]

The file lock that specifies locked ranges.

`AllocationSize` [in]

The file allocation size to check for any locked ranges.

Return value

FsRtlCheckLockForOplockRequest returns TRUE if the oplock request can be granted; otherwise it returns FALSE.

Remarks

FsRtlCheckLockForOplockRequest returns TRUE if AllocationSize = 0.

If FileLock has any pending lock requests, the check fails and FsRtlCheckLockForOplockRequest returns FALSE.

View the official Windows Driver Kit DDI reference