Symbol: IO_NOREUSE
sys/kern/vfs_bio.c
4993
KASSERT((ioflag & IO_NOREUSE) == 0 || (ioflag & IO_VMIO) != 0,
sys/kern/vfs_bio.c
5002
if ((ioflag & IO_NOREUSE) != 0)
sys/vm/vnode_pager.c
1507
ioflags |= (pager_flags & VM_PAGER_PUT_NOREUSE) != 0 ? IO_NOREUSE : 0;