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BtrfsFsTreeFetcher was used for early versions of the extent scanner, but neither subvol nor extent scan now needs an object that is both persistent and configured to access only one subvol. BtrfsExtentDataFetcher does the same thing in that case. Clarify the comments on what the remaining classes do, so that BtrfsFsTreeFetcher doesn't get inadvertently reinvented in the future. Signed-off-by: Zygo Blaxell <bees@furryterror.org>