btrfs: don't use ctl->free_space for max_extent_size
max_extent_size is supposed to be the largest contiguous range for the space info, and ctl->free_space is the total free space in the block group. We need to keep track of these separately and _only_ use the max_free_space if we don't have a max_extent_size, as that means our original request was too large to search any of the block groups for and therefore wouldn't have a max_extent_size set. CC: stable@vger.kernel.org # 4.14+ Reviewed-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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