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- Remove EROFS_MAP_ENCODED since it was always set together with EROFS_MAP_MAPPED for compressed extents and checked redundantly; - Replace the EROFS_MAP_FULL_MAPPED flag with the opposite EROFS_MAP_PARTIAL_MAPPED flag so that extents are implicitly fully mapped initially to simplify the logic; - Make fragment extents independent of EROFS_MAP_MAPPED since they are not directly allocated on disk; thus fragment extents are no longer twisted with mapped extents. Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>