btrfs: scrub: introduce a helper to locate an extent item
The new helper, find_first_extent_item(), will locate an extent item (either EXTENT_ITEM or METADATA_ITEM) which covers any byte of the search range. This helper will later be used to refactor scrub code. Signed-off-by: NQu Wenruo <wqu@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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