xfs: Switch to iomap for SEEK_HOLE / SEEK_DATA
Switch to the iomap_seek_hole and iomap_seek_data helpers for implementing lseek SEEK_HOLE / SEEK_DATA, and remove all the code that isn't needed any more. Based on patches from Andreas Gruenbacher <agruenba@redhat.com>. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com> Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
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