btrfs: make smaller extents more likely to go into bitmaps
It's less than ideal for small extents to eat into our extent budget, so force extents <= 32KB into the bitmaps save for the first handful. Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NDennis Zhou <dennis@kernel.org> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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