Provided by:
linux-doc-2.6.15_2.6.15-23.39_all 
NAME
fcntl_getlease - Enquire what lease is currently active
SYNOPSIS
int fcntl_getlease (struct file * filp);
ARGUMENTS
filp the file
DESCRIPTION
The value returned by this function will be one of (if no lease break
is pending):
F_RDLCK to indicate a shared lease is held.
F_WRLCK to indicate an exclusive lease is held.
F_UNLCK to indicate no lease is held.
(if a lease break is pending):
F_RDLCK to indicate an exclusive lease needs to be changed to a shared
lease (or removed).
F_UNLCK to indicate the lease needs to be removed.
XXX
sfr & willy disagree over whether F_INPROGRESS should be returned to
userspace.