xfs: Refactor xfs_ticket_alloc() to extract a new helper
Refactor xlog_ticket_alloc() to extract a new helper, i.e. xfs_log_calc_unit_res(). This helper would be used to calculate the total log reservation size by adding extra log operation/transation headers for a new log ticket. Signed-off-by: NJie Liu <jeff.liu@oracle.com> Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NMark Tinguely <tinguely@sgi.com> Signed-off-by: NBen Myers <bpm@sgi.com>
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