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xfs_copy: copy/restore xfs filesystem to/from regular file

When copying to regular file, the length of the resulting file is equal to the size of the source filesystem.
I added an option which store only the amount of space actually used in the source filesystem by the filesystem and the XFS log.

$ xfs_copy -s /dev/sdd1 regular_file
copy xfs filesystem on /dev/sdd1 to regular file as the amount used in fs.

$ xfs_copy -f regular_file /dev/sdd1
copy xfs filesystem to /dev/sdd1 from regular file which was copied using "xfs_copy -s"