NFS_LAYOUT_DRAIN
set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags);
test_and_clear_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags)) {
wake_up_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN);
if (test_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags) &&
lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN,
if (test_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags) &&
set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags);