btrfs: use reada direction enum instead of constant value in populate_free_space_tree
populate_free_space_tree calls function btrfs_search_slot_for_read with parameter int find_higher = 1, it means that, if no exact match is found, then use the next higher item. So in function populate_free_space_tree, use READA_FORWARD to read forward ahead. This also changes the value from READA_BACK to READA_FORWARD, since according to the logic, it should reada_for_search forward, not backward. Signed-off-by: Gu JinXiang <gujx@cn.fujitsu.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> [ update changelog ] Signed-off-by: David Sterba <dsterba@suse.com>
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