FOF_NOLOCK
foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_R);
foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_W);
if ((flags & FOF_NOLOCK) == 0) {
if ((flags & FOF_NOLOCK) == 0) {
if ((flags & FOF_NOLOCK) == 0) {
if ((flags & FOF_NOLOCK) == 0) {
return (foffset_lock(fp, FOF_NOLOCK));
return (foffset_lock(fp, FOF_NOLOCK));