vfs: vfs_clone_file_prep_inodes should return EINVAL for a clone from beyond EOF
vfs_clone_file_prep_inodes cannot return 0 if it is asked to remap from a zero byte file because that's what btrfs does. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <david@fromorbit.com>
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