xfs: return FIEMAP_EXTENT_UNKNOWN for delayed allocation extent
For FIEMAP ioctl(2), if an extent is in delayed allocation state, we need to return the FIEMAP_EXTENT_UNKNOWN flag except the FIEMAP_EXTENT_DELALLOC because its data location is unknown. Signed-off-by: NJie Liu <jeff.liu@oracle.com> Reviewed-by: NBen Myers <bpm@sgi.com> Signed-off-by: NBen Myers <bpm@sgi.com>
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