btrfs: get rid of extent_io_tree::dirty_bytes
This was used as an optimization for count_range_bits(EXTENT_DIRTY), which was used by the failed record code. However this was removed in this series by patch "btrfs: convert the io_failure_tree to a plain rb_tree" which was the last user of this optimization. Remove the ->dirty_bytes as nobody cares anymore. Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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