xfs: factor out a xfs_update_prealloc_flags() helper
This logic is duplicated in xfs_file_fallocate and xfs_ioc_space, and we'll need another copy of it for pNFS block support. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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