xfs: factor out xfs_ioctl_setattr transaciton preamble
The setup of the transaction is done after a random smattering of checks and before another bunch of ioperations specific validity checks. Pull all the preamble out into a helper function that returns a transaction or error. Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NBrian Foster <bfoster@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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