EXTENT_NORESERVE
bits |= EXTENT_NORESERVE;
btrfs_set_extent_bit(io_tree, page_start, end, EXTENT_NORESERVE,
extra_bits |= EXTENT_NORESERVE;
EXTENT_NORESERVE, 0, NULL);
btrfs_clear_extent_bit(io_tree, start, end, EXTENT_NORESERVE,
!(state->state & EXTENT_NORESERVE) &&
EXTENT_NORESERVE, &cached_state);
{ EXTENT_NORESERVE, "NORESERVE"}, \