FCNTL_GETLEASE(9) The Linux VFS FCNTL_GETLEASE(9)
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.
COPYRIGHT Kernel Hackers Manual 2.6. April 2016 FCNTL_GETLEASE(9)